CN110224373B - Overvoltage protection circuit and overvoltage protection device - Google Patents
Overvoltage protection circuit and overvoltage protection device Download PDFInfo
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- CN110224373B CN110224373B CN201910637009.6A CN201910637009A CN110224373B CN 110224373 B CN110224373 B CN 110224373B CN 201910637009 A CN201910637009 A CN 201910637009A CN 110224373 B CN110224373 B CN 110224373B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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Abstract
The application is applicable to the technical field of electronics, and provides an overvoltage protection circuit and an overvoltage protection device, the switch control module outputs a switch control signal, the drive control module controls the connection and disconnection of the power supply voltage signal according to the switch control signal, to output a corresponding drive control signal, the transformer module converts the supply voltage signal into a corresponding voltage output signal according to the drive control signal, and sampling the voltage output signal through a transformer feedback module to obtain a first feedback signal, the switch control module is also used for comparing the first feedback signal and the second feedback signal with a preset overvoltage protection threshold value, so as to adjust the switch control signal and achieve the effect of carrying out overvoltage protection on the input voltage and the output voltage at the same time.
Description
Technical Field
The embodiment of the application belongs to the technical field of electronics, and particularly relates to an overvoltage protection circuit and an overvoltage protection device.
Background
Along with the improvement of life quality of people, the types of automobile electrical appliances are more and more, the application range of the switching power supply circuit is wider and wider, and the range of a power supply voltage source of the switching power supply circuit is increased along with the types of storage batteries, for example, a mini-bus and a medium-bus are generally supplied with power by a 24V storage battery, and a bus is generally supplied with power by a 36V storage battery.
However, in the prior art, generally, overvoltage protection is performed on the output voltage of the power circuit, and when the input voltage is overvoltage, the problem of poor overvoltage protection is generated.
Disclosure of Invention
An object of the application is to provide an overvoltage crowbar and overvoltage protector, aim at solving prior art, carry out overvoltage protection to power supply circuit's output voltage usually, can produce the not good problem of overvoltage protection when the input voltage is excessive pressure.
The application provides an overvoltage crowbar is connected with power supply voltage source, overvoltage crowbar includes:
the switch control module is connected with the power supply voltage source, receives a power supply voltage signal provided by the power supply voltage source and outputs a switch control signal according to the power supply voltage signal;
the driving control module is connected with the power supply voltage source and the switch control module, receives the power supply voltage signal and the switch control signal, and controls the on and off of the power supply voltage signal according to the switch control signal so as to output a corresponding driving control signal;
the transformer module is respectively connected with the power supply voltage source and the drive control module, receives the power supply voltage signal and the drive control signal and converts the power supply voltage signal into a corresponding voltage output signal according to the drive control signal;
the transformer feedback module is respectively connected with the transformer module and the switch control module, and is used for sampling a voltage output signal output by the transformer module and sending a corresponding first feedback signal to the switch control module;
the voltage source feedback module is respectively connected with the power supply voltage source and the switch control module, and is used for sampling the power supply voltage signal and sending a corresponding second feedback signal to the switch control module;
the switch control module is further configured to compare the first feedback signal and the second feedback signal with a preset overvoltage protection threshold value, so as to adjust the switch control signal.
The application also provides an overvoltage protection device, the overvoltage protection device includes:
a supply voltage source port;
a voltage output port; and
as described above, the overvoltage protection circuit is connected to the supply voltage source port and the voltage output port, respectively.
The application provides an overvoltage protection circuit and an overvoltage protection device, wherein a switch control signal is output through a switch control module, a drive control module controls the on and off of a power supply voltage signal according to the switch control signal to output a corresponding drive control signal, a transformer module converts the power supply voltage signal into a corresponding voltage output signal according to the drive control signal, the voltage output signal is sampled through a transformer feedback module to obtain a first feedback signal, the power supply voltage signal is sampled through a voltage source feedback module to obtain a second feedback signal, the switch control module is also used for comparing the first feedback signal and the second feedback signal with a preset overvoltage protection threshold value to adjust the switch control signal so as to achieve the effect of simultaneously protecting input voltage and output voltage, the problem of among the prior art, carry out overvoltage protection to power supply circuit's output voltage usually, can produce the not good of overvoltage protection when the input voltage is excessive pressure is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of an over-voltage protection circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of an overvoltage protection circuit according to another embodiment of the present application;
fig. 3 is a schematic circuit diagram of an over-voltage protection circuit according to another embodiment of the present application;
fig. 4 is a schematic circuit diagram of the voltage source feedback module 25 according to an embodiment of the present application;
fig. 5 is a schematic circuit diagram of an over-voltage protection circuit according to another embodiment of the present application;
fig. 6 is a diagram illustrating a connection relationship between a common ground and a ground line according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
In order to explain the technical solution of the present application, the following detailed description is made with reference to the specific drawings and examples.
The present application will now be described in detail with reference to the drawings and specific examples.
The application provides an overvoltage crowbar, is connected with supply voltage source 10, and overvoltage crowbar includes:
the switch control module 21 is connected with the power supply voltage source 10, and the switch control module 21 receives a power supply voltage signal provided by the power supply voltage source 10 and outputs a switch control signal according to the power supply voltage signal;
the driving control module 22 is connected with the power supply voltage source 10 and the switch control module 21, and the driving control module 22 receives the power supply voltage signal and the switch control signal and controls the on and off of the power supply voltage signal according to the switch control signal so as to output a corresponding driving control signal;
the transformer module 23 is respectively connected with the power supply voltage source 10 and the drive control module 22, and the transformer module 23 receives the power supply voltage signal and the drive control signal and converts the power supply voltage signal into a corresponding voltage output signal according to the drive control signal;
the transformer feedback module 24 is respectively connected with the transformer module 23 and the switch control module 21, and the transformer feedback module 24 is configured to sample a voltage output signal output by the transformer module 23 and send a corresponding first feedback signal to the switch control module 21;
the voltage source feedback module 25 is respectively connected with the power supply voltage source 10 and the switch control module 21, and the voltage source feedback module 25 is used for sampling a power supply voltage signal and sending a corresponding second feedback signal to the switch control module 21;
the switch control module 21 is further configured to compare the first feedback signal and the second feedback signal with a preset overvoltage protection threshold value, so as to adjust the switch control signal.
In this embodiment, a power supply voltage signal provided by the power supply voltage source 10 supplies power to the switch control module 21, and the power supply voltage source 10 is sampled by the voltage source feedback module 25 to obtain a second feedback signal, the switch control module 21 outputs a switch control signal after being started, the driving control module 22 controls the on and off of the power supply voltage signal according to the switch control signal to output a corresponding driving control signal, the transformer module 23 converts the power supply voltage signal into a corresponding voltage output signal according to the driving control signal, and samples the voltage output signal by the transformer feedback module 24 to obtain a corresponding second feedback signal, wherein the first feedback signal and the second feedback signal are both input through a feedback signal end of the switch control module 21, the switch control module 21 compares the first feedback signal and the second feedback signal with a preset overvoltage protection threshold, so as to regulate the switch control signal and realize the overvoltage protection of the input voltage and the output voltage at the same time.
In one embodiment, referring to fig. 2, the overvoltage protection circuit further comprises:
and the voltage dividing module 26 is respectively connected with the power supply voltage source 10, the switch control module 21 and the voltage source feedback module 25, and the voltage dividing module 26 is used for dividing the power supply voltage signal and supplying power to the switch control module 21.
In this embodiment, the voltage dividing module 26 receives the power supply voltage signal provided by the power supply voltage source 10, and is connected to the voltage source feedback module 25 and the switch control module 21 to provide a voltage dividing effect, so as to prevent the electronic components in the switch control module 21 from being damaged due to an excessive voltage of the power supply voltage signal.
In one embodiment, referring to fig. 3, the drive control module 22 includes:
the driving unit 221 is connected with the switch control module 21, and the driving unit 221 is configured to receive the switch control signal and output a corresponding driving control signal to the transformer module 23 according to the switch control signal;
and the residual current absorption unit 222 is respectively connected with the power supply voltage source 10 and the driving unit 221, and the residual current absorption unit 222 is used for absorbing voltage spikes generated in the driving unit 221 so as to reduce the back voltage at two ends of a switching tube in the driving unit 221.
In this embodiment, the driving unit 221 is turned on and off according to the switch control signal, so as to output a corresponding driving control signal to the transformer module 23 to control the transformer module 23 to be turned on and off, thereby forming a flyback-type switching power supply, specifically, when the driving unit 221 is turned on according to the switch control signal, the driving control signal controls the transformer module 23 to be turned on, the inductor in the transformer module 23 is in a discharging state, when the driving unit 221 is turned off according to the switch control signal, the driving control signal controls the transformer module 23 to be turned off, the inductor in the transformer module 23 is in a discharging state, so as to provide energy to the output load through the transformer T, thereby outputting a corresponding voltage output signal. During the energy conversion process, the switching tube in the driving unit 221 is continuously turned on and off, so as to generate a voltage spike, and the residual current absorption unit 222 absorbs the voltage spike generated in the driving unit 221, so as to reduce the back voltage across the switching tube in the driving unit 221.
In one embodiment, referring to fig. 4, the voltage source feedback module 25 includes:
the voltage stabilizing unit 251 is connected with the power supply voltage source 10, and the voltage stabilizing unit 251 is used for generating a stabilized voltage signal according to the power supply voltage signal;
the backflow prevention unit 252 is connected to the voltage stabilization unit 251, the switch control module 21, and the transformer feedback module 24, respectively, and the backflow prevention unit 252 is configured to prevent the first feedback signal from entering the voltage source feedback module 25.
In this embodiment, the supply voltage signal provided by the supply voltage source 10 passes through the voltage dividing module 26 and the voltage stabilizing unit 251 to generate a voltage stabilizing signal with a stable voltage, and the backflow preventing unit 252 generates a corresponding second feedback signal to send to the switch control module 21, and since the first feedback signal and the second feedback signal are both input through the feedback signal end of the switch control module 21, the backflow preventing unit 252 is further configured to prevent the first feedback signal from being input to the voltage source feedback module 25.
In one embodiment, referring to fig. 4, the voltage source feedback module 25 further comprises:
the energy storage unit 253 is connected in parallel with the voltage stabilizing unit 251, and the energy storage unit 253 is used for providing a charging delay function so as to prevent false triggering operation generated at the starting moment of the power supply voltage source 10.
In this embodiment, the energy storage unit 253 is connected in parallel with the voltage stabilizing unit 251, so that the high voltage generated by the power supply voltage source 10 can be absorbed at the moment of circuit starting, and a charging delay effect is provided, thereby preventing the overcurrent protection device from being damaged by false triggering operation generated at the moment of starting of the power supply voltage source 10.
In one embodiment, referring to fig. 4, the voltage source feedback module 25 further comprises:
and a current limiting unit 254 connected to the power supply voltage source 10, wherein the current limiting unit 254 is configured to perform a current limiting process on the current flowing into the voltage stabilizing unit 251 so as to stabilize the voltage of the voltage stabilizing signal.
In the present embodiment, the current limiting unit 254 limits the current flowing into the voltage stabilizing unit 251, so that the voltage of the voltage stabilizing signal generated by the voltage stabilizing unit 251 is stabilized.
In one embodiment, referring to fig. 5, the current limiting unit 254 includes a current limiting resistor Rs, a first end of the current limiting resistor Rs is connected to the voltage dividing module 26, and a second end of the current limiting resistor Rs is connected to the backflow preventing unit 252.
In one embodiment, as shown in fig. 5, the voltage regulator unit 251 includes a voltage regulator ZD1, a cathode of the voltage regulator ZD1 is connected to the power supply voltage source 10, and an anode of the voltage regulator ZD1 is connected to the common ground.
In one embodiment, referring to fig. 5, the backflow prevention unit 252 includes a first diode D1, an anode of the first diode D1 is connected to the power supply voltage source 10, and a cathode of the first diode D1 is connected to the switch control module 21.
In this embodiment, a stable regulated voltage signal is generated across the zener diode ZD1, for example, the voltage of the regulated voltage signal may be VZD2, the voltage difference across the first diode D1 is VD 1-0.7V, the voltage of the second feedback signal is Vref 2-VZD 2-0.7V, and if the voltage of the second feedback signal is greater than the predetermined over-voltage protection threshold in the switch control module 21, the over-voltage protection is triggered.
In one embodiment, referring to fig. 5, the energy storage unit 253 includes a first capacitor D1, a first terminal of the first capacitor D1 is connected to the supply voltage source 10, and a second terminal of the first capacitor D1 is connected to the common ground terminal.
In one embodiment, the first capacitance D1 may be a plurality of capacitors connected in parallel or in series.
In one embodiment, referring to fig. 5, the switch control module 21 includes: a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a photocoupler receiver U1A and a switch controller chip U1;
an input end VIN of the switch controller chip U1, a first end of a first resistor R1, a first end of a second capacitor C2 and a first end of a third capacitor C3 are commonly connected with the voltage division module 26, a second end of the second capacitor C2 and a second end of a third capacitor C3 are commonly connected with a common ground terminal, a power supply end VCC of the switch controller chip U1 is connected with a first end of a seventh capacitor C7, a ground terminal GND of the switch controller chip U1 and a second end of a seventh capacitor C7 are commonly connected with the common ground terminal, an enable signal end EN of the switch controller chip U1, a second end of the first resistor R1, a first end of the second resistor R2 and a first end of a fourth capacitor C4 are commonly connected, a soft start end SS of the switch chip U1, a first end of the fifth capacitor C5 and a first end of the sixth capacitor C6 are commonly connected, a switching frequency setting end RT of the switch controller chip U1, a first end of the third resistor R3 and a first end 4 of the fourth capacitor C6 are commonly connected, a compensation signal terminal COMP of the switch controller chip U1 is connected to a first terminal of the photocoupler receiver U1A, a feedback signal terminal FB of the switch controller chip U1 is connected to the voltage source feedback module 25 and the transformer feedback module 24, a second terminal of the second resistor R2, a second terminal of the fourth capacitor C4, a second terminal of the fifth capacitor C5, a second terminal of the sixth capacitor C6, a second terminal of the third resistor R3, a second terminal of the fourth resistor R4, and a second terminal of the photocoupler receiver U1A are commonly connected to a common ground terminal, a current sensing terminal ISENSE of the switch controller chip U1 is connected to the driving control module 22, and a driving signal terminal GATE of the switch controller chip U1 is connected to the driving control module 22.
In this embodiment, the photocoupler receiver U1A receives the optical signal generated by the photocoupler light source in the post circuit connected to the overvoltage protection circuit in this embodiment, and generates a corresponding photoelectric signal to perform signal compensation on the switch controller chip U1.
In one embodiment, referring to fig. 5, the driving unit 221 includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a first switch tube Q1, a second switch tube Q2, a third switch tube M1, a fourth switch tube M2, a second diode D2, and a third diode D3;
a first end of the fifth resistor R5 and an anode of the second diode D2 are commonly connected to the voltage dividing module 26, a second end of the fifth resistor R5, a first end of the eighth capacitor, and a first end of the fourteenth resistor R14 are commonly connected to the switch control module 21, a second end of the eighth capacitor is connected to the common ground, a first end of the sixth resistor R6 is connected to the switch control module 21, a second end of the sixth resistor R6, a first end of the seventh resistor R7, a control end of the first switching tube Q1, and a control end of the second switching tube 483q 2 are commonly connected, a cathode of the second diode D2 is connected to a current input end of the first switching tube Q1, a current input end of the second switching tube Q2, a second end of the seventh resistor R7, a current output end of the first switching tube Q1, a first end of the eighth resistor R8, a cathode of the second diode D2, a first end of the tenth resistor R10, a cathode of the third diode D362, and a cathode of the second switching tube 3 5 are commonly connected to the current output end of the second switching tube Q2, an anode of the second diode D2 is connected to the first end of the ninth resistor R9, the second end of the eighth resistor R8, the second end of the ninth resistor R9, the first end of the twelfth resistor R12, and the control end of the third switching transistor M1 are all connected to one another, the current output end of the third switching transistor M1, the first end of the ninth capacitor R10, the first end of the tenth resistor R10, and the current output end of the fourth switching transistor M2 are all connected to the transformer module 23, an anode of the third diode D3 is connected to the first end of the eleventh resistor R11, the second end of the tenth resistor R10, the second end of the eleventh resistor R11, the first end of the thirteenth resistor R13, and the control end of the fourth switching transistor M2 are all connected to one another, the second end of the fourteenth resistor R14, the second end of the thirteenth resistor R13, the first end of the fifteenth resistor R15, the first end of the sixteenth resistor R16, the first end of the fourth switch M2, the current output end of the tenth capacitor M2, and the control end of the tenth capacitor M1 are all connected to one another, The current output end of the third switching tube M1, the second end of the twelfth resistor R12 and the second end of the ninth capacitor are connected in common, and the second end of the fifteenth resistor R15 and the second end of the sixteenth resistor R16 are connected in common to the common ground.
In one embodiment, the first switch Q1 may be an NPN transistor, a collector of the NPN transistor is a current input terminal of the first switch Q1, a base of the NPN transistor is a control terminal of the first switch Q1, and an emitter of the NPN transistor is a current output terminal of the first switch Q1.
In one embodiment, the second switch Q2 may be a PNP transistor, the emitter of the PNP transistor is the current input terminal of the second switch Q2, the base of the PNP transistor is the control terminal of the second switch Q2, and the collector of the PNP transistor is the current output terminal of the second switch Q2.
In one embodiment, the third switching transistor M1 and the fourth switching transistor M2 may be N-type MOS transistors, drains of the N-type MOS transistors are current output terminals of the third switching transistor M1 and the fourth switching transistor M2, gates of the N-type MOS transistors are control terminals of the third switching transistor M1 and the fourth switching transistor M2, and sources of the N-type MOS transistors are current output terminals of the third switching transistor M1 and the fourth switching transistor M2.
In one embodiment, the residual current absorbing unit 222 includes: a patch resistor formed by connecting a plurality of resistors in parallel, a fourth diode D4 and an eleventh capacitor D11; specifically, an anode of the fourth diode D4 is connected to the driving unit 221, a cathode of the fourth diode D4, a first end of the chip resistor and a first end of the eleventh capacitor D11 are connected to each other, and a second end of the chip resistor and a second end of the eleventh capacitor D11 are connected to the voltage dividing module 26.
In one embodiment, referring to fig. 5, the chip resistor includes a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19 and a twentieth resistor R20, wherein the first terminal of the seventeenth resistor R17, the first terminal of the eighteenth resistor R18, the first terminal of the nineteenth resistor R19 and the first terminal of the twentieth resistor R20 are connected together as the first terminal of the chip resistor, and the second terminal of the seventeenth resistor R17, the second terminal of the eighteenth resistor R18, the second terminal of the nineteenth resistor R19 and the second terminal of the twentieth resistor R20 are connected together as the second terminal of the chip resistor.
In one embodiment, referring to fig. 5, the transformer feedback module 24 includes: a twelfth capacitor C12, a fifth diode D5, a twenty-second resistor R22, and a twenty-third resistor R23;
a first end of the twelfth capacitor C12, a first end of the twenty-third resistor R23, and a first end of the twenty-second resistor R22 are commonly connected to the switch control module 21, a second end of the twelfth capacitor C12 and a second end of the twenty-third resistor R23 are commonly connected to the common ground, a second end of the twenty-second resistor R22 is connected to a cathode of the fifth diode D5, and an anode of the fifth diode D5 is connected to the transformer module 23.
In one embodiment, referring to fig. 5, the transformer module 23 includes a transformer T, a first input terminal of the transformer T is connected to the power supply voltage source 10, a second input terminal of the transformer T is connected to the driving control module 22, a first output terminal of the transformer T is connected to the output port, a second output terminal of the transformer T is grounded, a third output terminal of the transformer T is connected to the transformer feedback module 24, and a fourth output terminal of the transformer T is connected to the common ground.
Fig. 6 is a diagram illustrating a connection relationship between a common ground and a ground line according to an embodiment of the present application, and referring to fig. 6, the common ground is connected to a first terminal of a thirteenth capacitor C13, a second terminal of the thirteenth capacitor C13 is connected to a twenty-fourth resistor R24, and a second terminal of the twenty-fourth resistor R24 is connected to the ground line.
The application also provides an overvoltage protection device, and the overvoltage protection device includes:
a supply voltage source port;
a voltage output port; and
like the overvoltage protection circuit, the overvoltage protection circuit is respectively connected with the power supply voltage source port and the voltage output port.
The application provides an overvoltage protection circuit and an overvoltage protection device, wherein a switch control signal is output through a switch control module, a drive control module controls the on and off of a power supply voltage signal according to the switch control signal to output a corresponding drive control signal, a transformer module converts the power supply voltage signal into a corresponding voltage output signal according to the drive control signal, the voltage output signal is sampled through a transformer feedback module to obtain a first feedback signal, the power supply voltage signal is sampled through a voltage source feedback module to obtain a second feedback signal, the switch control module is also used for comparing the first feedback signal and the second feedback signal with a preset overvoltage protection threshold value to adjust the switch control signal so as to achieve the effect of simultaneously protecting input voltage and output voltage, the problem of among the prior art, carry out overvoltage protection to power supply circuit's output voltage usually, can produce the not good of overvoltage protection when the input voltage is excessive pressure is solved.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (9)
1. An overvoltage protection circuit connected to a supply voltage source, said overvoltage protection circuit comprising:
the switch control module is connected with the power supply voltage source, receives a power supply voltage signal provided by the power supply voltage source and outputs a switch control signal according to the power supply voltage signal;
the driving control module is connected with the power supply voltage source and the switch control module, receives the power supply voltage signal and the switch control signal, and controls the on and off of the power supply voltage signal according to the switch control signal so as to output a corresponding driving control signal;
the transformer module is respectively connected with the power supply voltage source and the drive control module, receives the power supply voltage signal and the drive control signal and converts the power supply voltage signal into a corresponding voltage output signal according to the drive control signal;
the transformer feedback module is respectively connected with the transformer module and the switch control module, and is used for sampling a voltage output signal output by the transformer module and sending a corresponding first feedback signal to the switch control module; and
the voltage source feedback module is respectively connected with the power supply voltage source and the switch control module, and is used for sampling the power supply voltage signal and sending a corresponding second feedback signal to the switch control module; the first feedback signal and the second feedback signal are both input through a feedback signal end of the switch control module;
the switch control module is further used for comparing the first feedback signal and the second feedback signal with a preset overvoltage protection threshold value so as to regulate the switch control signal;
the drive control module includes:
the driving unit is connected with the switch control module and used for receiving the switch control signal and outputting a corresponding driving control signal to the transformer module according to the switch control signal;
the residual current absorption unit is respectively connected with the power supply voltage source and the driving unit and is used for absorbing voltage spikes generated in the driving unit so as to reduce the back voltage at two ends of a switching tube in the driving unit;
the driving unit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a second diode and a third diode;
the first end of a fifth resistor and the anode of a second diode are connected with the voltage dividing module in common, the second end of the fifth resistor, the first end of an eighth capacitor and the first end of a fourteenth resistor are connected with the switch control module in common, the second end of the eighth capacitor is connected with a common grounding terminal, the first end of a sixth resistor is connected with the switch control module, the second end of the sixth resistor, the first end of a seventh resistor, the control end of a first switch tube and the control end of a second switch tube are connected in common, the cathode of a second diode is connected with the current input end of the first switch tube, the current input end of the second switch tube, the second end of the seventh resistor, the current output end of the first switch tube, the first end of the eighth resistor, the cathode of a second diode, the first end of a tenth resistor and the cathode of a third diode are connected in common, the current output end of the second switch tube is connected, and the anode of the second diode is connected with the first end of a ninth resistor, the second end of the eighth resistor, the second end of the ninth resistor, the first end of the twelfth resistor and the control end of the third switching tube are connected in common, the current output end of the third switching tube, the first end of the ninth capacitor, the first end of the tenth resistor and the current output end of the fourth switching tube are connected in common to the transformer module, the anode of the third diode is connected with the first end of the eleventh resistor, the second end of the tenth resistor, the second end of the eleventh resistor, the first end of the thirteenth resistor and the control end of the fourth switching tube are connected in common, the second end of the fourteenth resistor and the second end of the thirteenth resistor, the first end of the fifteenth resistor, the first end of the sixteenth resistor, the current output end of the fourth switch tube, the second end of the tenth capacitor, the current output end of the third switch tube, the second end of the twelfth resistor and the second end of the ninth capacitor are connected in common, and the second end of the fifteenth resistor and the second end of the sixteenth resistor are connected in common to the common ground terminal.
2. The overvoltage protection circuit of claim 1, wherein the overvoltage protection circuit further comprises:
and the voltage division module is respectively connected with the power supply voltage source, the switch control module and the voltage source feedback module, and is used for carrying out voltage division processing on the power supply voltage signal and supplying power to the switch control module.
3. The overvoltage protection circuit of claim 1, wherein the voltage source feedback module comprises:
the voltage stabilizing unit is connected with the power supply voltage source and is used for generating a voltage stabilizing signal according to the power supply voltage signal;
and the backflow preventing unit is respectively connected with the voltage stabilizing unit, the switch control module and the transformer feedback module and is used for preventing the first feedback signal from entering the voltage source feedback module.
4. The overvoltage protection circuit of claim 3, wherein said voltage source feedback module further comprises:
and the energy storage unit is connected with the voltage stabilizing unit in parallel and is used for providing a charging delay effect so as to prevent false triggering operation generated by the power supply voltage source at the starting moment.
5. The overvoltage protection circuit of claim 3, wherein said voltage source feedback module further comprises:
and the current limiting unit is connected with the power supply voltage source and is used for limiting the current flowing into the voltage stabilizing unit so as to stabilize the voltage of the voltage stabilizing signal.
6. The overvoltage protection circuit according to claim 3, wherein the voltage regulator unit comprises a voltage regulator tube, a cathode of the voltage regulator tube is connected with the power supply voltage source, and an anode of the voltage regulator tube is connected with a common ground terminal.
7. The overvoltage protection circuit of claim 3, wherein the back-flow prevention unit comprises a first diode, an anode of the first diode is connected to the supply voltage source, and a cathode of the first diode is connected to the switch control module.
8. The overvoltage protection circuit of claim 4, wherein the energy storage unit comprises a first capacitor, a first terminal of the first capacitor is connected to the supply voltage source, and a second terminal of the first capacitor is connected to a common ground.
9. An overvoltage protection device, characterized in that the overvoltage protection device comprises:
a supply voltage source port;
a voltage output port; and
the overvoltage protection circuit of any one of claims 1 to 8, connected to the supply voltage supply port and the voltage output port, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN111245227A (en) * | 2020-03-25 | 2020-06-05 | 美的集团股份有限公司 | Power supply circuit, circuit board and vehicle-mounted air conditioner |
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