KR20130112495A - Apparatus for measuring isolation resistance having malfunction self-diagnosing and method thereof - Google Patents

Abstract

PURPOSE: An insulation resistance measurement device including a self-failure diagnosis function and a self-failure diagnosis method using the same are provided to measure the insulation resistance of a battery. CONSTITUTION: An insulation resistance measurement device comprises a first and a second insulation measurement resistance unit (110, 120), a first and a second switch (SW1, SW2), a power detecting unit (130), and a control unit (140). The first and the second insulation measurement resistance unit are individually connected to the cathode or an anode of a battery. The first and the second switch connect the insulation measurement resistance unit to the cathode or the anode. The power detecting unit senses the first and the second failure diagnosis voltage through the first and the second insulation measurement resistance unit. The control unit outputs the control signal to the first and the second switch and determines the failure of the first and the second switch by using the first and the second failure diagnosis voltage. [Reference numerals] (130) Voltage detecting unit; (140) Control unit

Description

Insulation resistance measuring device with fault self-diagnosis function and fault self-diagnosis method using it {APPARATUS FOR MEASURING ISOLATION RESISTANCE HAVING MALFUNCTION SELF-DIAGNOSING AND METHOD THEREOF}

The present invention relates to an insulation resistance measuring apparatus having a fault self-diagnosis function and a fault self-diagnosis method using the same, and more particularly, an apparatus capable of measuring the insulation resistance of a battery employed in a battery power supply system requiring a high voltage. The present invention relates to a device and a method for self-diagnosing a fault for a device.

In recent years, due to exhaustion of fossil energy and environmental pollution, there is a growing interest in electric products that can be driven by electric energy without using fossil energy.

Accordingly, as the development and demand for technology for mobile devices, electric vehicles, hybrid vehicles, power storage devices, and uninterruptible power supplies increase, the demand for secondary batteries as energy sources is rapidly increasing, and the types of demand are also diversifying. Therefore, a lot of research is being conducted on a battery composed of a secondary battery to meet various needs.

In particular, in devices such as electric vehicles or hybrid vehicles that use high-power, high-capacity batteries, the insulation between the battery and the device needs to be well maintained. This is because if the battery is not insulated, leakage currents can cause various problems. For reference, leakage current may cause unexpected battery discharge or malfunction of electronic devices included in the device. In addition, devices using high voltage batteries, such as electric vehicles, can cause fatal electric shock to humans. Therefore, in order to solve the problems caused by the leakage current as described above, various insulation resistance measuring devices have been developed and used to calculate whether the secondary battery is well maintained by calculating the insulation resistance of the secondary battery.

On the other hand, if a failure occurs in the insulation resistance measuring device and the calculation of the insulation resistance value is not made accurately, the effect of using the device is halved, and thus the aforementioned various problems caused by the leakage current cannot be solved. In particular, if a failure occurs in the switch element included in the device for measuring the insulation resistance and the switching control in the on or off state is not properly performed, the accurate insulation resistance value cannot be measured and the measured insulation resistance value cannot be trusted. Accordingly, there is a need for an apparatus and method for diagnosing a failure of an insulation resistance measuring apparatus.

The present invention has been made in view of the above-described prior art, and an object thereof is to provide an insulation resistance measuring apparatus capable of self-diagnosing a failure and a failure self-diagnosis method using the same.

According to an aspect of the present invention, there is provided an insulation resistance measuring apparatus having a failure self-diagnosis function, the first insulation measuring resistance unit and the second insulation measuring resistance unit respectively connected to a positive terminal and a negative terminal of a battery; A first switch and a second switch connecting the first insulation measurement resistor and the second insulation measurement resistor to the positive terminal and the negative terminal, respectively; A voltage detector configured to sense first and second fault diagnosis voltages through the first and second insulation measuring resistors; And outputting a control signal to the first and second switches to form a failure diagnosis circuit, and when the failure diagnosis circuit is formed from the voltage detection unit, the first and second failure diagnosis voltages, And a controller for determining whether the switch is malfunctioning.

Preferably, the second insulation measuring resistor unit further includes a DC power supply unit supplying a predetermined V _DC voltage.

According to the present invention, the controller controls the first and second switches to operate on and determines that the first switch is an open state failure when the obtained first failure diagnosis voltage is 0V. The controller may control the first switch to be in an off operation and the second switch to be in an on operation, and determine that the first switch is a short-circuit failure when the obtained first failure diagnosis voltage is a voltage other than 0V. .

According to the present invention, the controller controls the first switch and the second switch to perform an on operation, and when the obtained second fault diagnosis voltage is V _DC , determines that the second switch is an open state fault. The controller may determine that the second switch is a short-circuit failure when the second switch is controlled to control the second switch to perform an off operation and the acquired second fault diagnosis voltage is a voltage other than V _DC. do.

The control unit according to the invention, the switch controller for outputting a signal for controlling the on-off operation of the first and second switches; An A / D converter for converting an analog voltage signal output from the voltage detector into a digital voltage signal; And a central processor configured to receive a digital voltage signal from the A / D converter and determine whether the first or second switch has a failure.

The insulation resistance measuring apparatus having a failure self-diagnosis function according to the present invention may further include a transmitter configured to form a communication interface with an external device, wherein the controller includes information on whether a failure of the first or second switch occurs. Transmits to the external device through the transmission unit. The external device may be a battery analysis device or a control device of a battery-mounted system.

The insulation resistance measuring apparatus having a failure self-diagnosis function according to the present invention may further include a warning unit for outputting a visual or audio warning signal, wherein the control unit is configured to perform the failure in the first or second switch. The warning unit outputs a visual or audio warning signal.

In the fault self-diagnosis method of the insulation resistance measuring apparatus according to the present invention for achieving the above technical problem, by connecting the first and second insulation measurement resistance to the positive or negative terminal of the battery using a first switch and a second switch A method of self-diagnosing a failure of the first and second switches using first and second failure diagnosis voltages detected through the first and second insulation measuring resistors, the method comprising: (a) the first and second switches Outputting a control signal to each on and off operation; (b) receiving first and second fault diagnosis voltages detected through the first and second insulation measurement resistors; And (c) determining whether the first or second switch is faulty using the first and second fault diagnosis voltages.

According to one aspect of the invention, it is possible to diagnose whether or not a device for measuring the insulation resistance of the battery failure.

According to another aspect of the present invention, it is possible to diagnose the failure using the original configuration without additional configuration to the device for measuring the insulation resistance of the battery.

According to another aspect of the invention, the user or an external device is notified of the failure, so that the user can take action.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention, And should not be construed as limiting.
1 is a circuit diagram schematically illustrating an equivalent circuit of an insulation resistance measuring apparatus having a fault self-diagnosis function and a battery power supply system according to an exemplary embodiment of the present invention.
2 is a circuit diagram schematically illustrating an equivalent circuit of an insulation resistance measuring apparatus having a fault self-diagnosis function according to an exemplary embodiment of the present invention.
3 is a circuit diagram schematically illustrating a first circuit.
4 is a circuit diagram schematically illustrating a second circuit.
5 is a circuit diagram schematically illustrating a failure diagnosis circuit according to an exemplary embodiment of the present invention.
6 is a block diagram showing the configuration of a control unit according to an embodiment of the present invention.
7 is a flowchart illustrating a flow of a method for diagnosing a failure of an insulation resistance measuring apparatus according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a circuit diagram schematically showing an equivalent circuit of an insulation resistance measuring apparatus 100 having a fault self-diagnosis function and a battery power supply system according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the insulation resistance measuring apparatus 100 having a fault self-diagnosis function according to the present invention includes a battery 10 having a plurality of cells connected in series and / or in parallel to form a cell assembly. In a battery power supply system consisting of a load 20 that receives the power output from the battery 10, the battery 10 is connected between the positive and negative terminals of the battery 10.

The battery 10 has a structure in which a plurality of unit cells rechargeable with electrical energy storage means are electrically connected. The unit cell is an electric double layer capacitor or a secondary battery such as a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydrogen battery, a nickel zinc battery, and the like including an ultra capacitor. For example, when the battery 10 is a battery used in an electric vehicle or a hybrid vehicle, the battery 10 outputs high voltage DC power of 200V or more. However, the present invention is not limited by the type of battery, output voltage, charging capacity, and the like.

The load 20 may be configured as a driving motor M, a DC to DC converter (not shown), or the like of an electric vehicle or a hybrid vehicle. In addition, the load 20 may include a DC / DC cap C1 and Y-caps C2 and C3 to remove noise generated by the driving motor M. FIG. The DC / DC cap C1 removes high frequency noise generated by the drive motor M by employing a capacitor having a large capacity, and the Y-caps C2 and C3 remove low frequency noise generated by the drive motor M. do.

The insulation resistance measuring apparatus 100 having a fault self-diagnosis function according to the present invention is connected between the positive and negative terminals of the battery 10 to measure the insulation resistance of the battery 10. Prior to the description of the fault self-diagnosis algorithm of the insulation resistance measuring apparatus 100 having a fault self-diagnosis function according to the present invention, the insulation resistance of the insulation resistance measuring apparatus 100 having a fault self-diagnosis function according to the present invention. The measurement algorithm is briefly described.

2 is a circuit diagram schematically showing an equivalent circuit of the insulation resistance measuring apparatus 100 with a fault self-diagnosis function according to the present invention.

2, the insulation resistance measuring apparatus 100 having a fault self-diagnosis function according to the present invention includes a first insulation measurement resistance unit 110, a second insulation measurement resistance unit 120, and a first switch ( SW1), the second switch SW2, the voltage detector 130 and the controller 140.

The first switch SW1 selectively connects the first insulation measuring resistor 110 to the positive terminal of the battery 10. The first switch SW1 performs an on-off operation by a control signal of the controller 140. Therefore, the first insulation measurement resistor unit 110 is selectively connected to the positive terminal of the battery 10 by the control signal of the controller 140. In the present specification, a circuit formed by connecting the first insulation measurement resistor unit 110 to the positive terminal of the battery 10 is referred to as a first circuit for better understanding of the present invention. When the first circuit is formed, the voltage at the positive terminal side of the battery is applied to the first insulation measuring resistor 110.

The second switch SW2 selectively connects the second insulation measuring resistor 120 to the negative terminal of the battery 10. The second switch SW2 performs an on-off operation by a control signal of the controller 140. Therefore, the second insulation measurement resistor unit 120 is selectively connected to the negative terminal of the battery 10 by the control signal of the controller 140. In the present specification, a circuit formed by connecting the second insulation measurement resistance unit 120 to the negative terminal of the battery 10 is referred to as a second circuit for better understanding of the present invention. When the second circuit is formed, the voltage on the negative terminal side of the battery is applied to the second insulation measuring resistor 120.

Preferably, the second insulation measurement resistor unit 120 further includes a DC power supply unit DC. This allows the voltage detector 130 to sense a non-zero voltage value by applying a positive voltage to the second insulation resistance resistor 120 when the second circuit is formed.

Preferably, the first and second insulation measurement resistance parts 110 and 120 include a plurality of resistance elements. The resistance values of the plurality of resistance elements may be arbitrarily selected to set a range of voltages applied to the respective resistance elements by the battery 10. According to an embodiment of the present invention, the value of the resistor may be appropriately selected so that the voltage range sensed by the voltage detector 130 is 5V or less.

2 illustrates an embodiment in which the first and second insulation measuring resistors 110 and 120 are configured of the first and second resistors R ₁ and R ₂ , but the present invention is not limited thereto. Do not. In addition, the embodiment illustrated in FIG. 2 may help the understanding of the present invention, and the first and second insulation measuring resistors 110 and 120 may have the same first and second resistors R ₁ and R to simplify the drawings. _It is to be understood that the embodiment is illustrated by ₂ ). It will be apparent to those skilled in the art that the number of resistance elements, the resistance value of each resistance element, etc. may be variously set.

The voltage detector 130 senses an insulation detection voltage applied to the first and second insulation resistance resistors 110 and 120. The insulation detection voltage is a voltage applied to the second resistor (R ₂ ). The insulation detection voltage is used to calculate an insulation resistance value of the battery 10. In the present specification, when the first circuit is formed, a voltage applied to the second resistor R ₂ included in the first insulation measurement resistor unit 110 is referred to as a first insulation detection voltage V ₁ . When the second circuit is formed, a voltage applied to the second resistor R ₂ included in the second insulation measuring resistor 120 is referred to as a second insulation detection voltage V ₂ . The voltage detector 130 outputs signals corresponding to the first and second insulation detection voltages V ₁ and V ₂ to the controller 140.

The controller 140 outputs a signal for controlling on and off operations of the first and second switches SW1 and SW2. When the controller 140 controls the first switch SW1 to perform an on operation, the controller 140 controls the second switch SW2 to maintain an off state. On the contrary, when the controller 140 controls the second switch SW2 to perform an on operation, the controller 140 controls the first switch SW1 to maintain an off state. In this way, the controller 140 allows the first and second insulation measurement resistance units 120 to be connected to the positive terminal and the negative terminal of the battery 10 at different points in time. On the other hand, the first and second switches (SW1, SW2) is only a name for distinguishing each other, and means the order in which the control unit 140 outputs a control signal, or of the insulation resistance measuring apparatus 100 It does not indicate the order of operation.

The controller 140 receives signals corresponding to the first and second insulation detection voltages V ₁ and V ₂ received from the voltage detector 130. Then, the control unit 140 is a positive terminal side insulation resistance (R _{Leak (+)} ) from the simultaneous circuit equation derived from the first and second insulation detection voltage (V ₁ , V ₂ ) and the first and second circuit. Value and the negative electrode side insulation resistance (R _{Leak (-)} ) value are calculated. An algorithm for calculating insulation resistance values using the simultaneous circuit equation will be described in detail below.

Meanwhile, the voltage of the battery 10 is denoted by V _Bat , and the positive terminal side insulation resistance (R _{Leak (+)} ) and the negative terminal side insulation resistance (R _Leak ) displayed on the positive and negative terminals of the battery 10, respectively. _(-) ) Represents a virtual resistance value representing the insulation state of the battery 10. Therefore, when the insulation state of the battery 10 is broken, the positive electrode terminal insulation resistance (R _{Leak (+)} ) value and the negative electrode terminal insulation resistance (R _{Leak (-)} ) value will be measured to be low, thereby It can be interpreted that a current has occurred.

Hereinafter, the insulation resistance measuring apparatus 100 having a fault self-diagnosis function according to the present invention will be described with reference to FIGS. 3 and 4 in the positive terminal side insulation resistance (R _{Leak (+)} ) value and the negative terminal side insulation resistance (R _Leak). Let's take a closer look at the algorithm for calculating the _(-) value.

3 is a circuit diagram schematically illustrating a first circuit.

Referring to FIG. 3, the current flowing through the first insulation measuring resistance unit 110 is I ₁ , the current flowing through the positive electrode terminal insulation resistance R _{Leak (+)} is I ₂ , and the negative electrode terminal insulation is performed. The current flowing through the resistor R _{Leak (−)} is denoted by I ₃ .

First, when the expression value of the first insulating detected voltage (V ₁₎ to I _1, it is expressed as shown in Equation 1 below.

Since the first insulation measurement resistance portion 110 and the anode terminal side insulation resistance R _{Leak (+)} are in a parallel relationship, the following relationship is established as shown in Equation (2).

On the other hand, applying Kirchhoff's current law based on node n connected to ground, Equation 3 is derived.

Substituting Equations 1 and 2 into Equation 3 and arranging for I ₃ , Equation 3 can be expressed as Equation 4 below.

Meanwhile, when Kirchhoff's voltage law is applied based on Mesh 1 shown in FIG. 3, the equation of the first row included in Equation 5 below is derived. Then, by arranging the equations of the first row by using I ₂ and I ₃ obtained through Equations 1 to 4, the equation of the last row included in Equation 5 below can be derived.

The equation of the last row included in Equation 5 is one of simultaneous circuit equations for calculating the positive terminal side insulation resistance (R _{Leak (+)} ) value and the negative terminal side insulation resistance (R _{Leak (−)} ) value. It will be used with the rest of the circuit equations described below.

4 is a circuit diagram schematically illustrating a second circuit.

Referring to FIG. 4, the current flowing through the second insulation resistance resistor 120 is I ₁ , the current flowing through the cathode terminal insulation resistance R _{Leak (−)} is I ₂ , and the anode terminal insulation resistance is I ₂ . The current flowing through (R _{Leak (+)} ) was denoted by I ₃ .

First, when the value for the second insulation detection voltage (V ₂ ) is expressed by I _{1, it} is expressed as Equation 6 below.

In addition, since the second insulation measurement resistance unit 120 and the negative electrode terminal side insulation resistance R _{Leak (−)} are in a parallel relationship, a relationship as shown in Equation 7 below is established.

On the other hand, if Kirchhoff's current law is applied based on node n connected to ground, Equation 8 below is derived.

Substituting Equations 6 and 7 into Equation 8 and arranging for I ₃ , Equation 8 may be expressed as Equation 9 below.

Meanwhile, when Kirchhoff's voltage law is applied based on Mesh 2 shown in FIG. 4, the equation of the first row included in Equation 10 below is derived. And, by arranging the equation of the first row by using I ₂ and I ₃ obtained through Equations 6 to 9, the equation of the last row included in Equation 10 below can be derived.

The equation of the last row included in Equation 10 is the remaining circuit of the simultaneous circuit equation for calculating the positive terminal side insulation resistance (R _{Leak (+)} ) value and the negative terminal side insulation resistance (R _{Leak (-)} ) value Equation. Therefore, the equation of the last row included in Equation 5 and the equation of the last row included in Equation 10 are combined to form a positive terminal side insulation resistance R _{Leak (+} ) and a negative terminal side insulation resistance R _{Leak ( -)} ), The following equation (11) can be obtained.

In Equation 11, the battery voltage value V _Bat , the resistance values of the first and second resistors R ₁ and R ₂ , and the voltage value V _DC of the DC power supply unit are known values. Second insulation detection voltages V ₁ and V ₂ may be obtained through the voltage detection unit 130. Therefore, the control unit 140 substitutes the first and second insulation detection voltages V ₁ and V ₂ received from the voltage detector 130 into Equation 11 to insulate the positive electrode terminal side of the battery 10. The (R _{Leak (+)} ) value and the negative terminal side insulation resistance (R _{Leak (-)} ) value can be calculated quantitatively, respectively.

As described above, when the positive terminal side insulation resistance (R _{Leak (+)} ) value and the negative terminal side insulation resistance (R _{Leak (-)} ) value of the battery 10 are respectively calculated, the electrode of the battery in which the dielectric breakdown occurs is accurately measured. I can figure it out.

As described above, the insulation resistance measuring apparatus 100 having the fault self-diagnosis function according to the present invention finishes a schematic description of an algorithm for calculating the insulation resistance value, and the insulation resistance measurement having the fault self-diagnosis function according to the present invention. The failure self-diagnosis algorithm of the device 100 will be described.

5 is a circuit diagram schematically illustrating a failure diagnosis circuit according to the present invention.

Referring to FIG. 5, it can be seen that the fault diagnosis circuit is formed irrespective of the positive terminal side insulation resistance R _{Leak (+} ) and the negative terminal side insulation resistance R _{Leak (−)} . Therefore, the positive electrode terminal insulation resistance R _{Leak (+)} and the negative electrode terminal insulation resistance R _{Leak (-)} do not affect the failure self-diagnosis according to the present invention.

The voltage detector 130 senses a failure diagnosis voltage applied to the first and second insulation resistance resistors 110 and 120. The fault diagnosis voltage is a voltage applied to the second resistor R ₂ , similarly to the insulation detection voltage described above. The failure diagnosis voltage is used to diagnose whether the first and second switches SW1 and SW2 have failed. In the present specification, the voltage applied to the second resistor R ₂ included in the first insulation measurement resistor unit 110 is referred to as a first failure diagnosis voltage V _diag1 . The voltage applied to the second resistor R ₂ included in the second insulation measuring resistor 120 is referred to as a second failure diagnosis voltage V _diag2 . The voltage detector 130 outputs signals corresponding to the first and second failure diagnosis voltages V _diag1 and V _diga2 to the controller 140.

First, an algorithm for diagnosing a failure of the first switch SW1 will be described. The controller 140 controls the first and second switches SW1 and SW2 to be turned on. When the fault diagnosis circuit is formed, the battery voltage V _Bat is applied to the second resistor R ₂ included in the first insulation resistance measuring unit 110 so that a voltage other than 0V is applied by the voltage detector 130. Will be detected. However, if the first failure diagnosis voltage V _diag1 acquired from the voltage detector 130 is 0V, the controller 140 determines the first switch SW1 as an open state failure. In the present specification, the open state failure means a case in which the switch element does not perform normal on-off operation by a control signal and keeps an open state in which current cannot be conducted.

On the contrary, the controller 140 controls the first switch SW1 to perform an off operation and the second switch to perform an on operation. As a result, the first insulation resistance measuring unit 110 is not connected to any power source. In this case, 0 V may be detected by the voltage detector 130 in the second resistor R ₂ included in the first insulation resistance measuring unit 110. However, if the first failure diagnosis voltage V _diag1 obtained from the voltage detector 130 is a voltage other than 0V, the controller 140 determines the first switch SW1 as a short-circuit failure. In the present specification, the short-circuit state failure means a case in which the switch element does not perform normal on-off operation by a control signal and keeps a short state for conducting current.

Next, an algorithm for diagnosing a failure of the second switch SW2 will be described. The controller 140 controls the first and second switches SW1 and SW2 to be turned on. When the failure diagnosis circuit is formed and the second insulation resistance measurement section 120 of the second resistance (R ₂₎ there is a voltage (V _Bat) and the DC power applied to the negative voltage (V _DC) of the battery is V _DC contained in the Other voltages will be detected by the voltage detector 130. However, if the second failure diagnosis voltage V _diag2 obtained from the voltage detector 130 is V _DC , the controller 140 determines the second switch SW2 as an open state failure.

On the contrary, the controller 140 controls the first switch SW1 to turn on and the second switch SW2 to turn off. As a result, the second insulation resistance measuring unit 120 is not connected to the battery 10. In this case, V _DC may be detected by the voltage detector 130 in the second resistor R ₂ included in the second insulation resistance measurer 120. However, if the second fault diagnosis voltage V _diag2 obtained from the voltage detector 130 is a voltage other than V _DC , the controller 140 determines the second switch SW2 as a short state fault. do.

The controller 140 may include a switch controller 143, an A / D converter 141, and a central processor 142 to execute the above-described failure diagnosis algorithm.

6 is a block diagram showing the configuration of the control unit 140 according to the present invention.

Referring to FIG. 6, the switch controller 143 outputs a switch control signal for controlling on / off operations of the first and second switches SW1 and SW2. The controller 140 receives a voltage measurement signal from the voltage detector 130. In this case, the A / D converter 141 converts the analog voltage signal output from the voltage detector 130 into a digital voltage signal. The central processor 142 receives the digital voltage signal from the A / D converter 141 and determines whether the first and second switches SW1 and SW2 have failed.

 The controller 140 or the central processor 142 may be a processor, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a register, known in the art to execute the various control logics described above. Communication modems, data processing devices, and the like. In addition, when the above-described control logic is implemented in software, the control unit 140 or the central processor 142 may be implemented as a set of program modules. At this time, the program module is stored in the memory and can be executed by the processor. Here, the memory may be inside or outside the processor and may be connected to the processor by various well-known means. Memory is a general term for a device in which information is stored regardless of a device type, and does not refer to a specific memory device.

According to another aspect of the present invention, the insulation resistance measuring apparatus 100 having a fault self-diagnosis function according to the present invention further includes a transmitter 150 forming a communication interface with an external device. In this case, the controller 140 may transmit information on whether the first and second switches SW1 and SW2 have failed, to the external device through the transmitter 150. The external device may be a battery analyzer or a control device of a battery-mounted system.

According to another aspect of the present invention, the insulation resistance measuring apparatus 100 having a fault self-diagnosis function according to the present invention may further include a warning unit 160 for outputting a visual or audio warning signal. In this case, the controller 140 may output a visual or audio warning signal through the warning unit 160 when a failure occurs in the first and second switches SW1 and SW2. In the event of a failure, the warning unit 160 may warn the user of the failure of the first and second switches SW1 and SW2 included in the insulation resistance measuring apparatus 100 so that the user may take appropriate measures. .

For example, the warning unit 160 may include an LED, an LCD, an alarm alarm, or a combination thereof. In this case, the warning unit 160 may flash a LED, output a warning message on the LCD, or generate an alarm buzzer to warn the user of a failure. In addition, the warning unit 160 may be included in an external device connected to the transmission unit 150. However, the present invention is not limited thereto. In addition, the LED, LCD and alarm alarm is only one example of the warning unit 160, it will be apparent to those skilled in the art that various modified forms of visual or audio alarm device can be employed as the warning unit 160. Do.

Hereinafter, a method of diagnosing a failure of an insulation resistance measuring apparatus corresponding to an operation mechanism of the apparatus described above will be described. However, the repetitive description of the configuration of the insulation resistance measuring apparatus 100 having the fault self-diagnosis function described above will be omitted.

7 is a flowchart illustrating a flow of a method for diagnosing a failure of an insulation resistance measuring apparatus according to an exemplary embodiment of the present invention.

First, in step S410, the control unit 140 outputs a switch control signal. In this step, the fault diagnosis circuit is formed by connecting the first and second insulation measurement resistance parts 110 and 120 to the positive and negative terminals of the battery 10, respectively. Switch control when the control unit 140 diagnoses whether or not the first switch SW1 has failed and the second switch SW2 has been described above has been described above, and thus repetitive description thereof will be omitted. .

In a next step S420, a signal corresponding to the voltages applied to the second resistors R ₂ , that is, the first and second failure diagnosis voltages V _diag1 and V _diag2 , is received from the voltage detector 130. . In operation S430, the controller 140 may determine whether the first and second switches SW1 and SW2 have failed using the first and second failure diagnosis voltages V _diag1 and V _diag2 received in step S420. Judge. The failure diagnosis algorithm using the first and second failure diagnosis voltages V _diag1 and V _diag2 will be described in detail, and a repetitive description thereof will be omitted.

Preferably, when the first and second switches SW1 and SW2 have failed (YES in step S430), go to step S440 to transmit information on whether a failure has occurred to an external device, or move to step S450 to the user. Can warn you.

According to the present invention, it is possible to diagnose whether a device for measuring the insulation resistance of a battery has failed. In addition, the original configuration can be used to diagnose a failure without additional configuration to the device for measuring the insulation resistance of the battery. In addition, the user or external device is notified of the failure so that the user can take action.

Meanwhile, in describing the present invention, each configuration of the insulation resistance measuring apparatus having a failure self-diagnosis function according to the present invention illustrated in FIGS. 1 to 6 is logically divided rather than physically divided. It should be understood as an element.

That is, since each configuration corresponds to a logical component for realizing the technical idea of the present invention, even if each component is integrated or separated, if the functions performed by the logical configuration of the present invention can be realized, And it is to be understood that any component that performs the same or similar function should be construed as being within the scope of the present invention irrespective of the consistency of the name.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

10: Battery 20: Load
100: insulation resistance measuring device 110: first insulation measurement resistance part
120: second insulation measurement resistance unit 130: voltage detection unit
140: control unit 141: A / D converter
142: central processing processor 143: switch controller
150: transmission unit 160: warning unit
DC: DC power supply part R ₁ : First resistor
R ₂ : second resistance R _{Leak (+)} : anode terminal side insulation resistance
R _{Leak (-)} : Negative terminal side insulation resistance SW1: First switch
SW2: second switch V _1: a first insulating detected voltage
V ₂ : second insulation detection voltage V _diag1 : first failure diagnosis voltage
V _diag2 : Second fault diagnosis voltage V _DC : DC power supply voltage value

Claims (18)

A first insulation measurement resistance unit and a second insulation measurement resistance unit respectively connected to the positive terminal and the negative terminal of the battery;
A first switch and a second switch connecting the first insulation measurement resistor and the second insulation measurement resistor to the positive terminal and the negative terminal, respectively;
A voltage detector configured to sense first and second fault diagnosis voltages through the first and second insulation measuring resistors; And
Outputting a control signal to the first and second switches to form a fault diagnosis circuit, and using the first and second fault diagnosis voltages received when the fault diagnosis circuit is formed from the voltage detector, the first and second switches. Insulation resistance measuring device having a failure self-diagnosis function comprising a; control unit for determining whether the failure. The method of claim 1,
The second insulation measuring resistance unit further comprises a DC power supply unit for supplying a predetermined V _DC voltage; insulation resistance measuring apparatus having a fault self-diagnosis function. 3. The apparatus of claim 2,
Insulation resistance measurement having a fault self-diagnosis function, characterized in that the first switch is determined to be an open state fault when the first fault diagnosis voltage is controlled to be turned on and the first fault diagnosis voltage is 0V. Device. 3. The apparatus of claim 2,
The first switch is controlled to be in an off operation, the second switch is controlled to be in an on operation, and when the acquired first failure diagnosis voltage is a voltage other than 0V, the first switch is determined as a short-circuit failure. Insulation resistance measuring device with fault self-diagnosis function. 3. The apparatus of claim 2,
Insulation with a fault self-diagnosis function, characterized in that the second switch is determined to be an open state fault when the first fault diagnosis voltage is controlled to be ON and the second fault diagnosis voltage is V _DC. Resistance measuring device. 3. The apparatus of claim 2,
The first switch controls the second switch to perform an off operation to perform an on operation, and when the obtained second failure diagnosis voltage is a voltage other than V _DC , the second switch is determined to be a short-circuit failure. Insulation resistance measuring device with fault self-diagnosis function. The apparatus of claim 1,
A switch controller configured to output a signal for controlling on and off operations of the first and second switches;
An A / D converter for converting an analog voltage signal output from the voltage detector into a digital voltage signal; And
Insulation resistance measuring apparatus having a failure self-diagnosis function comprising a; central processing processor for receiving a digital voltage signal from the A / D converter to determine whether the first or second switch is broken. The method of claim 1,
Further comprising: a transmission unit for forming a communication interface with the external device,
The control unit, the insulation resistance measuring device having a failure self-diagnosis function, characterized in that for transmitting the information about whether the failure of the first or second switch to the external device via the transmission unit. 9. The method of claim 8,
And the external device is a battery analysis device or a control device of a battery-mounted system. The method of claim 1,
And a warning unit for outputting a visual or audio warning signal.
The control unit, the insulation resistance measurement device having a failure self-diagnosis function, characterized in that for outputting a visual or audio warning signal through the warning unit when a failure occurs in the first or second switch. The first and second insulation measuring resistors are connected to the positive or negative terminals of the battery by using the first switch and the second switch, and the first and second fault diagnosis voltages detected through the first and second insulation measuring resistors are used. In the method for self-diagnosing the failure of the first and second switches using,
(a) outputting a control signal to each of the first and second switches to perform an on-off operation;
(b) receiving first and second fault diagnosis voltages detected through the first and second insulation measurement resistors; And
(c) determining whether the first or second switch is faulty using the first and second fault diagnosis voltages. 12. The method of claim 11,
The second insulation measuring resistor unit further comprises a DC power supply unit for supplying a predetermined V _DC voltage; self-diagnosis method of the insulation resistance measuring apparatus. The method of claim 12,
Step (a) may include controlling the first and second switches to be in an on operation; ego,
The step (c) is a step of determining the first switch as an open state failure when the first failure diagnosis voltage is 0V; Self-diagnosis method of the insulation resistance measuring apparatus. The method of claim 12,
Step (a) may include controlling the first switch to be in an off operation and the second switch to be in an on operation; ego,
Wherein (c), when the first failure diagnosis voltage is a voltage other than 0V, determining the first switch as a short-circuit failure; self-diagnosis method of the insulation resistance measuring apparatus. The method of claim 12,
Step (a) may include controlling the first and second switches to be in an on operation; ego,
Wherein (c), when the second fault diagnosis voltage is V _DC , determining the second switch as an open state fault; fault self-diagnosis method of the insulation resistance measuring apparatus. The method of claim 12,
The step (a) may include controlling the first switch to be in an on operation and the second switch to be in an off operation; ego,
Wherein (c), when the second failure diagnosis voltage is a voltage other than V _DC , determining the second switch as a short-circuit state failure; self-diagnosis method of the insulation resistance measuring apparatus. 12. The method of claim 11,
And transmitting information on whether a failure of the first or second switch occurs to an external device. 12. The method of claim 11,
And a visual or audio warning to the user when a failure occurs in the first or second switch.

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