CN115328087A - Primary side information detection circuit, method and chip of secondary side PD controller - Google Patents
Primary side information detection circuit, method and chip of secondary side PD controller Download PDFInfo
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Abstract
The circuit comprises a first acquisition module, a second acquisition module, a first comparator, an adder, a switch module and a controller, wherein the first acquisition module is used for acquiring VBUS voltage, the second acquisition module is used for acquiring VD platform voltage, and the sampling proportion of the first acquisition module and the second acquisition module is the same; when the voltage of the VD platform is larger than the sum of the VBUS voltage and the configured bias voltage, the first comparator is used for outputting a driving signal to the switch module so as to drive the switch module to be conducted; the switch module is used for generating an output signal according to the VD platform voltage in different on and off states; the controller is used for determining primary side information according to the pulse width and the pulse intensity of the output signal. The sampling circuit has the advantages of simple circuit structure, flexible configuration, high sampling precision and low cost.
Description
Technical Field
The present application relates to the technical field of primary side information detection, and in particular, to a primary side information detection circuit, a primary side information detection method, and a primary side information detection chip of a secondary side PD controller.
Background
The secondary side PD controller is typically used to control a power transistor connected to a secondary winding of the power supply system to control the output voltage across the secondary winding. In application, the switching frequency, the on-time, the off-time and the effective line voltage value of the primary side controller need to be detected.
However, in the prior art, a circuit used for detecting the primary side information is relatively complex, the detection cost is high, and the detection accuracy is low.
In summary, the prior art has the problems of complex primary side information detection circuit and high detection cost.
Disclosure of Invention
The application aims to provide a primary side information detection circuit, a method and a chip of a secondary side PD controller, so as to solve the problems that the primary side information detection circuit is complex and the detection cost is high in the prior art.
In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:
in a first aspect, an embodiment of the present application provides a primary side information detection circuit of a secondary side PD controller, where the circuit includes a first acquisition module, a second acquisition module, a first comparator, an adder, a switch module, and a controller, the first acquisition module is electrically connected to the adder, the adder is further electrically connected to a first input end of the first comparator, the second acquisition module is electrically connected to a second input end of the first comparator, an output end of the first comparator is electrically connected to the switch module, and the switch module is further electrically connected to the second acquisition module and the controller, respectively; wherein,
the first acquisition module is used for acquiring VBUS voltage, the second acquisition module is used for acquiring VD platform voltage, and the sampling proportion of the first acquisition module is the same as that of the second acquisition module;
the adder is used for adding the VBUS voltage and a configured bias voltage and then outputting the VBUS voltage and the configured bias voltage to the first comparator;
when the VD platform voltage is larger than the VBUS voltage and the sum of the configured bias voltage, the first comparator is used for outputting a driving signal to the switch module so as to drive the switch module to be conducted;
the switch module is used for generating an output signal according to the voltage of the VD platform in different on and off states;
and the controller is used for determining primary side information according to the pulse width and the pulse intensity of the output signal.
Optionally, the first acquisition module includes an acquisition unit and a filtering unit, the acquisition unit is electrically connected to the first input terminal of the adder, and the input terminal of the acquisition unit is further grounded through the filtering unit, the acquisition unit is configured to acquire a VBUS voltage, the second input terminal of the adder is configured to receive a configured bias voltage, and the output terminal of the adder is electrically connected to the first input terminal of the first comparator; wherein,
the adder is used for adding the VBUS voltage and the configured bias voltage and outputting the added voltage to the first input end of the comparator.
Optionally, the collecting unit includes a first resistor and a second resistor, one end of the first resistor connected in series with the second resistor is connected to the main circuit to collect the VBUS voltage, the other end of the first resistor is grounded, and the first input end of the adder is connected between the first resistor and the second resistor.
Optionally, the primary side information detection circuit of the secondary side PD controller further includes a second comparator, a first input end of the second comparator is configured to receive a preset voltage, a second input end of the second comparator is electrically connected to the second acquisition module, and an output end of the second comparator is electrically connected to a second input end of the adder; wherein,
the second comparator is used for generating an offset voltage and transmitting the offset voltage to a second input end of the adder.
Optionally, the second acquisition module includes a third resistor and a fourth resistor, the third resistor is connected in series with the fourth resistor at one end for acquiring the VD platform voltage, the other end is grounded, and the second input end of the first comparator and the switch module are both connected between the third resistor and the fourth resistor.
Optionally, the switch module includes a transmission gate, a gate of the transmission gate is electrically connected to the output terminal of the first comparator, an input terminal of the transmission gate is electrically connected to the second acquisition module, and an output terminal of the transmission gate is electrically connected to the controller.
Optionally, the primary side information detection circuit of the secondary side PD controller further includes a first capacitor, a second capacitor, a buffer, and a fifth resistor, where one end of the buffer and one end of the first capacitor are both electrically connected to the switch module, the other end of the first capacitor is grounded, the other end of the buffer is electrically connected to one end of the fifth resistor, the other end of the fifth resistor is electrically connected to the controller, and the other end of the fifth resistor is grounded through the second capacitor.
In a second aspect, an embodiment of the present application further provides a detection chip, where the detection chip includes the primary side information detection circuit of the secondary side PD controller.
In a third aspect, an embodiment of the present application further provides a primary side information detection method of a secondary side PD controller, which is applied to the primary side information detection circuit of the secondary side PD controller, and the method includes:
collecting VBUS voltage and VD platform voltage;
generating an output signal according to the sum of the VBUS voltage and the configured bias voltage and the VD platform voltage;
and determining primary side information according to the pulse width and the pulse intensity of the output signal.
Optionally, the step of generating an output signal according to the VD stage voltage and the sum of the VBUS voltage and the configured bias voltage comprises:
adding the VBUS voltage and the configured bias voltage by using an adder, and then generating an output signal with the VD platform voltage; and generating the configured bias voltage according to the VD platform voltage and a preset voltage.
Compared with the prior art, the method has the following beneficial effects:
the circuit comprises a first acquisition module, a second acquisition module, a first comparator, an adder, a switch module and a controller, wherein the first acquisition module is electrically connected with the adder, the adder is also electrically connected with a first input end of the first comparator, the second acquisition module is electrically connected with a second input end of the first comparator, an output end of the first comparator is electrically connected with the switch module, and the switch module is also electrically connected with the second acquisition module and the controller respectively; the first acquisition module is used for acquiring VBUS voltage, the second acquisition module is used for acquiring VD platform voltage, and the sampling proportion of the first acquisition module is the same as that of the second acquisition module; the adder is used for adding the VBUS voltage and the configured bias voltage and then outputting the added voltage to the first comparator, and when the VD platform voltage is larger than the sum of the VBUS voltage and the configured bias voltage, the first comparator is used for outputting a driving signal to the switch module so as to drive the switch module to be conducted; the switch module is used for generating an output signal according to the VD platform voltage in different on and off states; the controller is used for determining the primary side information according to the pulse width and the pulse intensity of the output signal. Because the circuit module that this application provided is comparatively simple, consequently its cost is lower. And the primary side information can be determined by collecting and comparing the sum of the VD platform voltage, the VBUS voltage and the configured bias voltage, and the accuracy is higher.
In order to make the aforementioned objects, features and advantages of the present application comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and it will be apparent to those skilled in the art that other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 shows a system block diagram of a secondary side PD controller in the prior art.
Fig. 2 shows a schematic diagram of a prior art secondary side VDS waveform.
Fig. 3 shows a block diagram of a primary side information detection circuit of a secondary side PD controller according to an embodiment of the present application.
Fig. 4 shows a schematic circuit diagram of a primary side information detection circuit of a secondary side PD controller according to an embodiment of the present application.
Fig. 5 shows an exemplary flowchart of a primary side information detection method of a secondary side PD controller according to an embodiment of the present application.
In the figure:
110-a first acquisition module; 120-a second acquisition module; 130-an adder; 140-a first comparator; 150-a switch module; 160-a controller; 170-second comparator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not construed as indicating or implying relative importance.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
As described in the background, a secondary side PD controller, the system diagram of which is shown in fig. 1 in an application, is typically used to control a power transistor connected to a secondary winding of a power supply system to control an output voltage on the secondary winding.
As shown in fig. 1, the secondary side PD controller is connected to the secondary coil, and controls the on-off state and the on-off frequency of the power transistor in the primary circuit by acquiring information on the secondary coil, so as to control the output voltage on the secondary coil.
However, the related detection circuit is complex at present, and in view of this, the embodiment of the present application provides a primary side information detection circuit of a secondary side PD controller, which realizes detection of primary side information through a simpler circuit structure, thereby reducing cost.
The primary side information detection circuit of the secondary side PD controller provided in the present application is exemplified as follows:
as an optional implementation manner, please refer to fig. 2, the circuit includes a first acquisition module 110, a second acquisition module 120, a first comparator 140, an adder 130, a switch module 150, and a controller 160, the first acquisition module 110 is electrically connected to the adder 130, the adder 130 is further electrically connected to a first input end of the first comparator 140, the second acquisition module 120 is electrically connected to a second input end of the first comparator 140, an output end of the first comparator 140 is electrically connected to the switch module 150, and the switch module 150 is further electrically connected to the second acquisition module 120 and the controller 160, respectively; the first acquisition module 110 is used for acquiring VBUS voltage, the second acquisition module 120 is used for acquiring VD platform voltage, and the sampling proportion of the first acquisition module 110 is the same as that of the second acquisition module 120; the adder 130 is configured to add the VBUS voltage and the configured bias voltage and output the added VBUS voltage to the first comparator 140, and when the VD stage voltage is greater than the sum of the VBUS voltage and the configured bias voltage, the first comparator 140 is configured to output a driving signal to the switch module 150 to drive the switch module 150 to be turned on; the switch module 150 is configured to generate an output signal according to the VD platform voltage in different on and off states; the controller 160 is used for determining the primary side information according to the pulse width and the pulse strength of the output signal.
Wherein, VD platform voltage, the voltage that indicates the transformer secondary limit, and it satisfies the formula:
VD platform voltage = VBUS + VIN/NPS;
wherein, VBUS voltage represents secondary side output voltage, VIN is primary side output alternating current power supply voltage equivalent value, and NPS is transformer primary and secondary side turn ratio.
Since the second collecting module 120 can collect the VD platform voltage, the first collecting module 110 can collect the VBUS voltage and drive the switch module 150 to be turned on by a comparison method, and when the switch module 150 is turned on, the second collecting module 120 can output the VD platform voltage to the controller 160; when the switch module 150 is turned off, the second collecting module 120 cannot output the VD stage voltage to the controller 160, so that the output signal passing through the switch module 150 is actually a continuous pulse signal.
Because the output signal is directly related to the voltage of the VD platform, and the voltage frequency after the voltage transformation of the transformer is unchanged, only the voltage size is changed. On this basis, the frequency, the on-time, the off-time, and the primary voltage of the switching signal of the primary controller 160 can be determined according to the pulse width and the pulse intensity (pulse intensity representative voltage value) of the output signal, so that complete primary information is provided for the primary controller 160 on the secondary side, and the system decision requirement of the primary controller 160 is met.
During normal operation, the waveform of VDS at SR (secondary) side varies according to the effective value of the voltage VIN of the line and the difference of load, as shown in fig. 3, where VIN is the effective value of the voltage of the primary output ac power supply, and NPS is the primary-secondary turn ratio of the transformer. Since the VDS waveform varies with the VIN effective value and the switching frequency, and there is a resonance-like sinusoidal waveform interference to correctly sample the line voltage information, in order to detect the primary side controller switching frequency and the line voltage effective value from the SR (secondary) side VDS waveform, it is necessary to take a proper comparison threshold value to compare with the waveform, and at the same time, it is necessary to compare the platform voltage of the VDS waveform.
Therefore, as an implementation manner, please refer to fig. 4, the first collecting module 110 includes a collecting unit and a filtering unit, the collecting unit is electrically connected to the first input end of the adder 130, the input end of the collecting unit is further grounded through the filtering unit, the collecting unit is configured to collect VBUS voltage, the second input end of the adder 130 is configured to receive a bias voltage, and the output end of the adder 130 is electrically connected to the first input end of the first comparator 140; the adder 130 is configured to add the VBUS voltage and the offset voltage and output the added voltage to a first input terminal of the comparator. The filtering unit can be a capacitor, and the filtering function of the VBUS voltage is realized through the capacitor.
The primary side information detection circuit of the secondary side PD controller 160 further includes a second comparator 170, a first input end of the second comparator 170 is configured to receive a preset voltage, a second input end of the second comparator 170 is electrically connected to the second acquisition module 120, and an output end of the second comparator 170 is electrically connected to a second input end of the adder 130; the second comparator 170 is configured to generate an offset voltage and transmit the offset voltage to a second input terminal of the adder 130.
The collecting unit comprises a first resistor and a second resistor, one end of the first resistor connected with the second resistor in series is connected with the main circuit to collect the VBUS voltage, the other end of the first resistor is grounded, and the first input end of the adder 130 is connected between the first resistor and the second resistor. Wherein, the sampling ratio of this application is 50.
The second collecting module 120 includes a third resistor and a fourth resistor, one end of the third resistor connected in series with the fourth resistor is used for collecting the voltage of the VD platform, the other end is grounded, and the second input end of the first comparator 140 and the switch module 150 are both connected between the third resistor and the fourth resistor.
The switch module 150 includes a transmission gate having a gate electrically connected to the output of the first comparator 140, an input electrically connected to the second acquisition module 120, and an output electrically connected to the controller 160.
The primary side information detection circuit of the secondary side PD controller 160 further includes a first capacitor, a second capacitor, a buffer, and a fifth resistor, one end of the buffer and one end of the first capacitor are electrically connected to the switch module 150, the other end of the first capacitor is grounded, the other end of the buffer is electrically connected to one end of the fifth resistor, the other end of the fifth resistor is electrically connected to the controller 160, and the other end of the fifth resistor is grounded through the second capacitor.
Therefore, the working principle of the application is as follows:
VBUS voltage is sampled through a 10. And the high-side comparator obtains a VDS opening signal and a VDS closing signal, so that the opening time On of the VDS signal can be calculated, and the timing of the VDS closing signal to the first rising edge time of the fixed voltage comparator can obtain the closing time Off of the VDS signal.
On the basis of the implementation manner, the embodiment of the application also provides a detection chip, and the detection chip comprises the primary side information detection circuit.
In addition, referring to fig. 5, an embodiment of the present application further provides a method for detecting primary side information of the secondary side PD controller 160, where the method includes:
s102, collecting VBUS voltage and VD platform voltage.
And S104, generating an output signal according to the sum of the VBUS voltage and the configured bias voltage and the VD platform voltage.
And S106, determining primary side information according to the pulse width and the pulse intensity of the output signal.
Optionally, S104 includes:
adding the VBUS voltage and the configured bias voltage by using an adder, and then generating an output signal with the VD platform voltage; the configured bias voltage is generated according to the VD platform voltage and a preset voltage.
The following is an exemplary description of the high voltage input protection circuit provided in the present application:
in summary, the present application provides a primary side information detection circuit, a method and a chip of a secondary side PD controller, where the circuit includes a first acquisition module, a second acquisition module, a first comparator, an adder, a switch module and a controller, the first acquisition module is electrically connected to the adder, the adder is also electrically connected to a first input end of the first comparator, the second acquisition module is electrically connected to a second input end of the first comparator, an output end of the first comparator is electrically connected to the switch module, and the switch module is also electrically connected to the second acquisition module and the controller respectively; the first acquisition module is used for acquiring VBUS voltage, the second acquisition module is used for acquiring VD platform voltage, and the sampling proportion of the first acquisition module is the same as that of the second acquisition module; the adder is used for adding the VBUS voltage and the configured bias voltage and then outputting the added voltage to the first comparator, and when the voltage of the VD platform is larger than the sum of the VBUS voltage and the configured bias voltage, the first comparator is used for outputting a driving signal to the switch module so as to drive the switch module to be conducted; the switch module is used for generating an output signal according to the VD platform voltage in different on and off states; the controller is used for determining primary side information according to the pulse width and the pulse intensity of the output signal. Because the circuit module that this application provided is comparatively simple, consequently its cost is lower. And the primary side information can be determined by collecting and comparing the sum of the voltage of the VD platform, the voltage of VBUS and the configured bias voltage, and the accuracy is higher.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A primary side information detection circuit of a secondary side PD controller is characterized by comprising a first acquisition module, a second acquisition module, a first comparator, an adder, a switch module and a controller, wherein the first acquisition module is electrically connected with the adder, the adder is also electrically connected with a first input end of the first comparator, the second acquisition module is electrically connected with a second input end of the first comparator, an output end of the first comparator is electrically connected with the switch module, and the switch module is also electrically connected with the second acquisition module and the controller respectively; wherein,
the first acquisition module is used for acquiring VBUS voltage, the second acquisition module is used for acquiring VD platform voltage, and the sampling proportion of the first acquisition module is the same as that of the second acquisition module;
the adder is used for adding the VBUS voltage and a configured bias voltage and then outputting the VBUS voltage and the configured bias voltage to the first comparator;
when the VD platform voltage is greater than the sum of the VBUS voltage and a configured bias voltage, the first comparator is used for outputting a driving signal to the switch module so as to drive the switch module to be conducted;
the switch module is used for generating an output signal according to the VD platform voltage in different on and off states;
the controller is used for determining primary side information according to the pulse width and the pulse intensity of the output signal.
2. The primary side information detection circuit of the secondary side PD controller of claim 1, wherein the first collecting module comprises a collecting unit and a filtering unit, the collecting unit is electrically connected to the first input terminal of the adder, and the input terminal of the collecting unit is further grounded through the filtering unit, the collecting unit is configured to collect VBUS voltage, the second input terminal of the adder is configured to receive configured bias voltage, and the output terminal of the adder is electrically connected to the first input terminal of the first comparator; wherein,
the adder is used for adding the VBUS voltage and the configured bias voltage and outputting the added voltage to the first input end of the comparator.
3. The primary side information detection circuit of the secondary side PD controller according to claim 2, wherein said acquisition unit includes a first resistor and a second resistor, one end of said first resistor connected in series with said second resistor is connected to the main circuit for acquiring VBUS voltage, the other end is connected to ground, and the first input terminal of said adder is connected between said first resistor and said second resistor.
4. The primary side information detection circuit of the secondary side PD controller of claim 1, wherein the primary side information detection circuit of the secondary side PD controller further comprises a second comparator, a first input terminal of the second comparator is configured to receive a preset voltage, a second input terminal of the second comparator is electrically connected to the second acquisition module, and an output terminal of the second comparator is electrically connected to the second input terminal of the adder; wherein,
the second comparator is used for generating an offset voltage and transmitting the offset voltage to a second input end of the adder.
5. The primary side information detection circuit of the secondary side PD controller according to claim 1, wherein said second collection module includes a third resistor and a fourth resistor, one end of said third resistor and said fourth resistor connected in series is used for collecting VD platform voltage, the other end is grounded, and both the second input terminal of said first comparator and said switch module are connected between said third resistor and said fourth resistor.
6. The primary side information detection circuit of the secondary side PD controller of claim 1, wherein said switching module comprises a transmission gate, a gate of said transmission gate being electrically connected to an output of said first comparator, an input of said transmission gate being electrically connected to said second acquisition module, and an output of said transmission gate being electrically connected to said controller.
7. The primary side information detection circuit of the secondary side PD controller according to claim 1, further comprising a first capacitor, a second capacitor, a buffer and a fifth resistor, wherein the buffer and one end of the first capacitor are electrically connected to the switch module, the other end of the first capacitor is grounded, the other end of the buffer is electrically connected to one end of the fifth resistor, the other end of the fifth resistor is electrically connected to the controller, and the other end of the fifth resistor is grounded through the second capacitor.
8. A detection chip characterized by comprising the primary side information detection circuit of the secondary side PD controller according to any one of claims 1 to 7.
9. A primary side information detection method of a secondary side PD controller, which is applied to the primary side information detection circuit of the secondary side PD controller according to any one of claims 1 to 7, the method comprising:
collecting VBUS voltage and VD platform voltage;
generating an output signal according to the sum of the VBUS voltage and the configured bias voltage and the VD platform voltage;
and determining primary side information according to the pulse width and the pulse intensity of the output signal.
10. The method of detecting primary side information of a secondary side PD controller according to claim 9, wherein the step of generating an output signal according to the VD stage voltage based on the sum of the VBUS voltage and configured bias voltage comprises:
adding the VBUS voltage and the configured bias voltage by using an adder, and then generating an output signal with the VD platform voltage; and generating the configured bias voltage according to the VD platform voltage and a preset voltage.
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| CN115514194A (en) * | 2022-11-24 | 2022-12-23 | 成都市易冲半导体有限公司 | Load resistance value determining method and device, electronic equipment and storage medium |
| CN115514194B (en) * | 2022-11-24 | 2023-02-28 | 成都市易冲半导体有限公司 | Load resistance value determining method and device, electronic equipment and storage medium |
| CN117310262A (en) * | 2023-11-28 | 2023-12-29 | 成都市易冲半导体有限公司 | Primary side information detection circuit and detection chip of transformer |
| CN117310262B (en) * | 2023-11-28 | 2024-02-09 | 成都市易冲半导体有限公司 | Primary side information detection circuit and detection chip of transformer |
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