KR20190082446A - Door detector power control circuit - Google Patents

Abstract

There are wired and wireless methods for detecting opening or closing of a door. The wired method has inconvenience that an installation method is difficult according to door types, or a problem of the exterior due to wiring installation during installation and an increase in personnel expenses such that a large amount of door detectors, with which a wireless technology having a one-time battery or a rechargeable battery employed therein is combined, have been distributed. However, since operating time of the battery is as short as six months or one year, the one-time battery needs to be frequently replaced, or the rechargeable battery needs to be frequently charged. To solve the above problem, a door detector and power control circuit technology identifies information on opening and closing of a door while supplying operating power to a wireless circuit for a predetermined period of time when the door is opened or closed and then blocks the operating power by itself or blocks the operating power by itself after a predetermined period of time such that no power is consumed regardless of opening and closing of the door in normal times thereby prolonging the operating time of the built-in battery.

Description

DOOR DETECTOR POWER CONTROL CIRCUIT [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply control circuit for a door sensor, and more particularly, to a power supply control method for a door opening and closing detection circuit. In a method for detecting opening or closing of a door, A method using a reed switch in which the contact is opened when the contact is closed or when the reed switch is relatively far away from the permanent magnet is used. In the method using the wire detection circuit, the contact of the reed switch directly detects the close and open signals, Although a method of directly inputting a signal to a main body circuit of a device is common, a wireless door detection circuit includes a wireless transmitter. When a door is opened or closed, the wireless signal must be wirelessly transmitted to the door detection body. The door detector is always designed to be supplied with power. It is common way. As a wireless technology, a method using general radio frequency, Wi-Fi, ZigBee or Bluetooth signal is widely used. For convenience of installation, the power of the door sensor is used as a battery. In this case, In order to extend the operation time, when the door is opened or closed, normal power is supplied for a certain period of time and then the power is consumed when the door is kept closed for a predetermined time or continuously opened. A small amount of current is supplied instead of the normal operating current to the door detector circuit to reduce power consumption. However, even if the standby current is low, the current consumption of the battery continues to increase, which has a significant effect on battery operation time, resulting in faster battery replacement cycles. A reed switch operated by a magnet is used to detect the opening or closing of the door. Its operation is to attach a reed switch to the door of the door frame and attach a permanent magnet to the moving door with a reed switch When the door is opened and the permanent magnet attached to the door moves away from the door frame and the influence of the magnetic force disappears, a signal for opening the contact of the closed reed switch is input to the wireless transmitting / receiving circuit unit. To the door detection system. At this time, if the door is kept open or closed continuously while the power of the wireless type sensor is continuously supplied, the power is reduced through the built-in control circuit through a microcomputer I myself go into a low-power standby state, The operation time of the built-in battery becomes a problem due to the power consumption in the standby state which is not the zero-current state in which the power is cut off. In the market, the battery replacement period of the wireless door sensor is short, 6 months long, it is about one year, so many products are available. More specifically, as the permanent magnet attached to the door is moved away from the door frame when the door is opened, the contact of the reed switch attached to the door frame is changed to the magnetic range of the permanent magnet attached to the door And the reed switch attached to the door frame is turned off due to the magnetic force of the permanent magnet attached to the door when the door is closed, The door detector and power supply control circuit use the characteristic that the contact which has been turned on is turned off and the other contact which is turned on is turned off as the door is closed and opened. To a door sensor and a power supply control circuit which make a powerless standby state in which there is no current consumption by shutting off the power supply itself after sending a wireless signal to the door state

As a method for detecting the door opening of the door, a method using a magnet and a reed switch is commonly used.

In the method of detecting the opening or closing of the door by using the reed switch, the contact is normally turned off inside the reed switch. When the reed switch is close to the magnet, the reed switch internal contact is turned on by the magnetic force of the reed switch. There is a wired method in which a door open detection signal is directly sent as a switching signal to a door detection system by a wired line, and a wireless method in which a door is wirelessly transmitted without wired wiring. In the wired method, Since the magnet portion is attached to the door and the sensor portion is installed from the sensor portion to the door detection system through the wired wiring, the installation cost is increased and the wiring is exposed to the outside, . Therefore, a wireless sensor is widely used. In a wireless door detector, a rechargeable battery or a wireless door open detector with a built-in battery is used. A wireless door detector circuit uses semiconductors having very small operation current, Semiconductors require a relatively large amount of power when transmitting signals wirelessly, and there are many products in which the wireless circuit is always in standby state even when the door is open or closed. When the door is opened or closed, Power is transmitted and the door is continuously opened or continuously closed. When the standby state becomes longer, the current is consumed by itself, and the entire circuit is kept in the standby state by a minute current. However, the minute current is consumed, Time is consumed continuously This re-action time is always a problem. Although the operation time of the battery is increased by increasing the external size of the door sensor itself and the capacity is sufficient, the battery can not be used due to the appearance design of the door detector, the cost increase factor and the easiness of the installation method. Or a door sensor having an operating time of about one year is widely available, a door open detector with a longer operating time under the condition of the same battery capacity is required.

An object of the present invention is to provide a door sensor and a power control circuit for detecting operation of a door when the door is opened or closed and then supplying operating power to a wireless circuit through a door sensor and a power control circuit, So that the operation time of the battery built in the detector is maximized.

The door sensor and the power supply control circuit according to the above-described object of the present invention can be implemented by adding

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Here, the door sensor and the power control circuit start supplying power to the wireless door sensor circuit by opening and closing the door, and after confirming the end of the wireless transmission / reception in the microprocessor, And a processor module.

According to the power control circuit of the door sensor described above, when the door is opened and closed, the power of the microprocessor is supplied to the wireless signal transmitting / receiving circuit unit and the microprocessor with the state of the reed switch, If the door is opened or closed again, the battery power is used only for a certain period of time. In addition, unnecessary power consumption is eliminated and the operation time of the built-in battery is maximized. have.

In addition, power is supplied to the wireless transmitting / receiving circuit unit and the micro process unit by the power source control circuit of the door sensor to transmit door opening and closing signals wirelessly, and data received from the opposite wireless receiving unit It is possible to constitute a circuit in which the consumption of the battery is set to zero (0) at the time of standby after the power is turned off by itself.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.
Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a photograph showing a conventional method of installing a door sensor. In general, a permanent magnet is attached to a moving door when the door is opened and closed, and a door sensor for generating a door opening / It shows that it is attached to an immovable door frame.
Referring to the power source control circuit of the door sensor in Figs. 2-1 and 2-2 of Fig. 2,
The power source control circuit of the door sensor according to the embodiment of the present invention includes a battery unit B1, a first reed switch Reed 1, a second reed switch Reed 2, a charging resistor R1, and a charging capacitor C1 A charge capacitor first capacitor R2 and a transistor bias second resistor R3, a power supply switching transistor Q1 and a power supply control transistor Q2.
FIG. 2-1 is a circuit when the door is opened. In a state where the door is normally closed, 2NO (2 Normal Open), which is a contact point of the second reed switch Reed 2, is connected through a charging resistor R1 connected to the battery power (2Common) terminal, the reed switch is moved away from the permanent magnet attached to the door and is not affected by the magnetic field of the permanent magnet. When the door is opened, The reed switch Reed2 is positioned at the contact 2NC (2 Normal Close) from the contact 2NO and the current charged in the charge capacitor C2 for opening is turned on via the transistor bias second resistor R3 (Turn On). The turn-on power-supply control switching transistor Q2 turns on the power switching transistor Q1 while the voltage of the transistor collector becomes zero volts and the emitter of the transistor Q1 and the collector of the transistor Q1 turn on. And supplies the power of the battery to the wireless transmission / reception circuit unit and the microprocessor (RF unit) through a collector. At this time, the time when the power is supplied is determined by the capacitance value of the opening charging capacitor C2 and the time constant of the transistor bias second resistor R3.
FIG. 2-2 is a circuit when the door is closed. In a state where the door is normally open, the contact 1NC (1 Normal Close) of the first reed switch Reed 1 is connected through the charging resistor R1 connected to the battery power And the capacitor C1 for closing is charged through the 1Common terminal of the first reed switch Reed 1. When the door is closed, the first reed switch is close to the permanent magnet attached to the door The first reed switch 1 (Reed1) is positioned at the contact 1NO (1Normal Open) from the contact 1NC (1Normal Close) while receiving the influence of the magnetic field of the permanent magnet so that the current charged in the charge capacitor for closure (C1) 1 Turn on the power control transistor Q2 through the resistor R2. The turn-on power control transistor Q2 turns on the power switching transistor Q1 while the voltage of the transistor collector becomes zero volts and turns on the emitter of the transistor Q1 and the collector of the transistor Q1 Collector to supply the battery power to the wireless transceiver circuitry and the microprocessor (RF). The time during which power is supplied at this time is determined by the capacitance value of the charging capacitor for closing C1 and the time constant of the transistor bias first resistor R2.
In addition, since the time constant due to the capacitor and the resistance may not be accurate each time, the wireless transmitting / receiving unit and the microprocessor (RF unit) sense that power is applied, and at the same time, And transmits the door open and closed signals to the door detection apparatus main body. After confirming that information exchange for transmission and reception is completed, the microprocessor (RF section) transmits a power off signal to the third bias resistor R5 to shut off the power source control transistor Q2 and turn off the power source switching transistor Q1 to prevent the power source from being supplied to the power source itself.
It will be understood by those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the following claims will be.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail to the concrete inventive concept. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

B1: Battery
C1: Charge capacitor for closing
C2: Opening charge capacitor
Q1; Power switching transistor
Q2; Power control transistor
R1: Charging resistance
R2: transistor bias first resistance
R3: transistor bias second resistance
R4: Power Switching Bias Resistor
R5: transistor bias third resistance
Reed1: first reed switch
Reed2: Second reed switch
RF section; The wireless transceiver circuitry and the microprocessor

Claims (6)

A power supply control transistor for receiving a power supplied from the charge capacitor for opening and operating for a predetermined period of time, and a second power supply control transistor A power output transistor circuit controlled from the control transistor,
A first reed switch for sensing a closed state of the door, a charging capacitor for closing to be charged with battery power when the door is closed,
A power source control transistor that receives the charged power from the charged capacitor and operates for a predetermined period of time, a power source output transistor circuit controlled by the power source control transistor,
A power supply output transistor for outputting power by a power supply control transistor and a power supply control transistor for turning on the power supply for a predetermined time by the capacity of the charged capacitor and the transistor bias resistance value,
A microprocessor unit for receiving and operating the output power,
A door sensor and a power control circuit including a wireless transmission / reception circuit portion receiving and detecting a signal indicating that the door is opened or closed, and then outputting a power-off control signal by itself;
The door sensor according to claim 1, wherein the door sensor and the power control circuit include a contact connected to the door when the door is open and a reed switch having a contact point, A door detector and power supply control circuit including capacitors supplying power. [2] The apparatus of claim 1, wherein the door sensor and the power control circuit include a contact connected to the door when the door is closed and a reed switch having a contact point, A door detector and power supply control circuit including capacitors supplying power. The power supply control circuit of claim 1, wherein the door sensor and power supply control circuit further comprise a resistance connected to the capacitor to determine a resistance-capacitor time constant with the capacitor. The door sensor according to claim 1, wherein the door sensor and the power control circuit are configured to recognize the opening and closing information of the door, and then automatically output a power-off output in the microprocessor and the wireless transmitting / Power control circuit. The power control circuit of claim 1, further comprising a door sensor and a power control circuit for sensing door opening and closing using a microswitch instead of a reed switch.

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