CN118282186A - Protection circuit of PFC converter - Google Patents
Protection circuit of PFC converter Download PDFInfo
- Publication number
- CN118282186A CN118282186A CN202410703517.0A CN202410703517A CN118282186A CN 118282186 A CN118282186 A CN 118282186A CN 202410703517 A CN202410703517 A CN 202410703517A CN 118282186 A CN118282186 A CN 118282186A
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- chip
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- switching tube
- sampling resistor
- phase
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- 238000005070 sampling Methods 0.000 claims abstract description 177
- 238000006243 chemical reaction Methods 0.000 claims description 56
- 239000003990 capacitor Substances 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a protection circuit of a PFC converter, which relates to the field of switching power supplies, wherein the PFC converter comprises a sampling resistor and a switching tube, the sampling resistor is connected with the switching tube, and power grid current is transmitted to the switching tube through the sampling resistor; the protection circuit comprises a sampling chip and a driving circuit; the input end of the sampling chip is connected with the sampling resistor, and the sampling chip is used for detecting a voltage signal of the sampling resistor and outputting a high level or a low level according to the voltage signal of the sampling resistor; the driving circuit is respectively connected with the output end of the sampling chip and the switching tube; when the sampling chip outputs low level, the driving circuit outputs PWM signals to the switching tube so as to control the on-off of the switching tube; when the sampling chip outputs a high level, the driving circuit stops outputting the PWM signal to the switching tube. The invention obviously reduces the risk of instantaneous heavy current damage of the switching tube.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a protection circuit of a PFC converter.
Background
The three-phase VSR power factor correction (Power Factor Correction, PFC) converter is most commonly a three-phase half-bridge structure, uses a small number of semiconductor switching transistors, and has minimum dynamic loss during operation, so that the three-phase VSR PFC is suitable for an ultra-high power factor correction converter. With the advent of third generation power semiconductors, three-phase VSR PFC converters were able to operate in the high frequency range above 50 kHz.
However, the topology is easy to break down under some limited working conditions due to instantaneous high current, for example, the third generation power semiconductor breaks down due to sudden change or jump of the power grid voltage during full-load working.
Disclosure of Invention
The invention aims to provide a protection circuit of a PFC converter, which can solve the problem that a power tube breaks down due to instant heavy current in the working process of a switching tube under an emergency.
In order to achieve the above object, the present invention provides a protection circuit of a PFC converter, the PFC converter including a sampling resistor and a switching tube, the sampling resistor being connected to the switching tube, a power grid current being transmitted to the switching tube through the sampling resistor, the protection circuit of the PFC converter including: sampling chip and driving circuit;
The input end of the sampling chip is connected with the sampling resistor, and the sampling chip is used for detecting the voltage signal of the sampling resistor and outputting high level or low level according to the voltage signal of the sampling resistor;
the driving circuit is respectively connected with the output end of the sampling chip and the switching tube;
When the sampling chip outputs low level, the driving circuit outputs PWM signals to the switching tube so as to control the on-off of the switching tube;
and when the sampling chip outputs a high level, the driving circuit stops outputting PWM signals to the switching tube.
Optionally, the grid current is a three-phase current; the number of the sampling resistors is three, and the sampling resistors are respectively an A-phase sampling resistor, a B-phase sampling resistor and a C-phase sampling resistor; the number of the sampling chips is three, and the sampling chips are an A-phase sampling chip, a B-phase sampling chip and a C-phase sampling chip respectively;
The input end of the A-phase sampling chip is connected with two ends of the A-phase sampling resistor, the A-phase sampling chip is used for detecting a voltage signal of the A-phase sampling resistor, outputting a high level when the voltage signal of the A-phase sampling resistor is larger than a set reference voltage, and outputting a low level when the voltage signal of the A-phase sampling resistor is smaller than or equal to the set reference voltage;
The input end of the B-phase sampling chip is connected with two ends of the B-phase sampling resistor, the B-phase sampling chip is used for detecting a voltage signal of the B-phase sampling resistor, outputting a high level when the voltage signal of the B-phase sampling resistor is larger than a set reference voltage, and outputting a low level when the voltage signal of the B-phase sampling resistor is smaller than or equal to the set reference voltage;
the input end of the C-phase sampling chip is connected with two ends of the C-phase sampling resistor, the C-phase sampling chip is used for detecting a voltage signal of the C-phase sampling resistor, outputting a high level when the voltage signal of the C-phase sampling resistor is larger than a set reference voltage, and outputting a low level when the voltage signal of the C-phase sampling resistor is smaller than or equal to the set reference voltage.
Optionally, the driving circuit includes: logic level conversion chip and micro control unit;
The input end of the logic level conversion chip is connected with the micro control unit, and the output end of the logic level conversion chip is connected with the switching tube; the micro control unit is also connected with the output end of the sampling chip;
When the sampling chip outputs low level, the micro control unit sends a PWM signal to the logic level conversion chip, the logic level conversion chip converts the PWM signal and sends the converted PWM signal to the switching tube so as to control the on-off of the switching tube;
And when the sampling chip outputs a high level, the micro control unit stops sending the PWM signal to the logic level conversion chip.
Optionally, an OCP pin of the micro-control unit is connected with an output end of the sampling chip.
Optionally, the driving circuit further comprises an operational amplifier; the micro control unit is connected with the output end of the sampling chip through the operational amplifier.
Optionally, the driving circuit includes: logic level conversion chip and micro control unit;
the input end of the logic level conversion chip is respectively connected with the micro control unit and the sampling chip, and the output end of the logic level conversion chip is connected with the switching tube;
the micro control unit is used for sending PWM signals to the logic level conversion chip; the logic level conversion chip is used for converting the PWM signal;
when the sampling chip outputs low level, the logic level conversion chip sends a converted PWM signal to the switching tube so as to control the on-off of the switching tube;
And when the sampling chip outputs high level, the logic level conversion chip stops sending the converted PWM signal to the switching tube.
Optionally, an EN pin of the logic level conversion chip is connected with the sampling chip.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention only needs to use the sampling chip to detect the voltage signal of the sampling resistor, controls the PWM signal output to the switching tube according to the voltage signal of the sampling resistor, has few circuit elements and simple structure, can realize single instant current protection without shutdown, can realize long-time input overcurrent protection, can avoid the condition that the switching tube breaks down due to instant heavy current in the working process of the switching tube, and obviously reduces the risk of instant heavy current damage of the switching tube.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a protection circuit of a PFC converter according to the present invention.
Symbol description: the circuit comprises a 1-sampling chip, a 2-driving circuit, an R1-A phase sampling resistor, an R2-B phase sampling resistor, an R3-C phase sampling resistor, an L1-first inductor, an L2-second inductor, an L3-third inductor, a C1-first capacitor, a C2-second capacitor, a Q1-first power switching tube, a Q2-second power switching tube, a Q3-third power switching tube, a Q4-fourth power switching tube, a Q5-fifth power switching tube, a Q6-sixth power switching tube, a U1-A phase sampling chip, a U2-B phase sampling chip, a U3-C phase sampling chip, a U4-logic level conversion chip, a U5-micro control unit and a U6-operational amplifier.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a protection circuit of a PFC converter, which has few circuit elements and simple structure, can realize hardware overcurrent protection and software overcurrent protection, and obviously reduces the risk of instantaneous heavy current damage of a power switch tube.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The PFC converter comprises a sampling resistor and a switching tube, wherein the sampling resistor is connected with the switching tube, and the power grid current is transmitted to the switching tube through the sampling resistor. When the PFC converter works, the power grid current passes through the sampling resistor, and the current signal is converted into the voltage signal by adopting the voltage on the resistor.
As shown in fig. 1, the protection circuit of the PFC converter provided by the present invention includes: sampling chip 1 and driving circuit 2.
The input end of the sampling chip 1 is connected with the sampling resistor, and the sampling chip 1 is used for detecting the voltage signal of the sampling resistor and outputting high level or low level according to the voltage signal of the sampling resistor.
The driving circuit 2 is respectively connected with the output end of the sampling chip 1 and the switching tube.
When the sampling chip 1 outputs a low level, the driving circuit 2 outputs a PWM signal to the switching tube so as to control the on-off of the switching tube.
When the sampling chip 1 outputs a high level, the driving circuit 2 stops outputting a PWM signal to the switching tube.
Specifically, the grid current is a three-phase current. The number of the sampling resistors is three, namely an A-phase sampling resistor R1, a B-phase sampling resistor R2 and a C-phase sampling resistor R3. The number of the sampling chips 1 is three, namely an A-phase sampling chip U1, a B-phase sampling chip U2 and a C-phase sampling chip U3. The number of the switching tubes is 6, and the switching tubes are respectively a first power switching tube Q1, a second power switching tube Q2, a third power switching tube Q3, a fourth power switching tube Q4, a fifth power switching tube Q5 and a sixth power switching tube Q6.
The input end of the A-phase sampling chip U1 is connected with two ends of the A-phase sampling resistor R1, the A-phase sampling chip U1 is used for detecting a voltage signal of the A-phase sampling resistor R1, outputting a high level when the voltage signal of the A-phase sampling resistor R1 is larger than a set reference voltage, and outputting a low level when the voltage signal of the A-phase sampling resistor R1 is smaller than or equal to the set reference voltage.
The input end of the B-phase sampling chip U2 is connected with two ends of the B-phase sampling resistor R2, the B-phase sampling chip U2 is used for detecting a voltage signal of the B-phase sampling resistor R2, outputting a high level when the voltage signal of the B-phase sampling resistor R2 is larger than a set reference voltage, and outputting a low level when the voltage signal of the B-phase sampling resistor R2 is smaller than or equal to the set reference voltage.
The input end of the C-phase sampling chip U3 is connected with two ends of the C-phase sampling resistor R3, the C-phase sampling chip U3 is used for detecting a voltage signal of the C-phase sampling resistor R3, outputting a high level when the voltage signal of the C-phase sampling resistor R3 is larger than a set reference voltage, and outputting a low level when the voltage signal of the C-phase sampling resistor R3 is smaller than or equal to the set reference voltage.
The PFC converter further includes a first inductor L1, a second inductor L2, a third inductor L3, a first capacitor C1, and a second capacitor C2.
Specifically, the driving circuit 2 includes a logic level conversion chip U4 and a micro control unit U5. The input end of the logic level conversion chip U4 is connected with the micro control unit U5, and the output end of the logic level conversion chip U4 is connected with the switching tube.
In the present embodiment, the driving circuit 2 has the following two protection modes.
(1) The micro control unit U5 is also connected with the output end of the sampling chip 1. Specifically, the OCP pin of the micro-control unit U5 is connected to the output end of the sampling chip 1.
When the sampling chip 1 outputs a low level, the micro control unit U5 sends a PWM signal to the logic level conversion chip U4, and the logic level conversion chip U4 converts the PWM signal and sends the converted PWM signal to the switching tube so as to control the on-off of the switching tube. For example, the micro control unit U5 transmits a PWM signal of 3.3V to the logic level conversion chip U4, and the logic level conversion chip U4 converts the PWM signal of 3.3V into a PWM signal of 5V.
When the sampling chip 1 outputs a high level, the micro control unit U5 stops sending a PWM signal to the logic level conversion chip U4.
In the protection mode, the sampling chip 1 sends an abnormal voltage signal to the OCP pin of the micro control unit U5, and the micro control unit U5 performs OCP protection through a comparator.
(2) The input end of the logic level conversion chip U4 is also connected with the sampling chip 1. Specifically, the EN pin of the logic level conversion chip U4 is connected to the sampling chip 1.
The micro control unit U5 is used for sending PWM signals to the logic level conversion chip U4. The logic level conversion chip U4 is used for converting the PWM signal.
When the sampling chip 1 outputs a low level, the logic level conversion chip U4 sends a converted PWM signal to the switching tube so as to control the on-off of the switching tube.
When the sampling chip 1 outputs a high level, the logic level conversion chip U4 stops sending the converted PWM signal to the switching tube.
In the protection mode, the sampling chip 1 sends an abnormal voltage signal to the EN pin of the logic level conversion chip U4, the logic level conversion chip U4 stops outputting the PWM signal, and at this time, even if the micro control unit U5 is still sending the PWM signal, the switching tube will not have the PWM signal, so as to play a role in wave-by-wave current limiting.
Further, the driving circuit 2 further includes an operational amplifier U6. The micro control unit U5 is connected with the output end of the sampling chip 1 through the operational amplifier U6.
The invention can also adopt the two modes to protect the PFC converter at the same time, and at the moment, the micro control unit U5 and the logic level conversion chip U4 are both connected with the sampling chip 1. When the sampling chip 1 outputs a low level, the micro control unit U5 sends a PWM signal to the logic level conversion chip U4, and the logic level conversion chip U4 converts the PWM signal and sends the converted PWM signal to the switching tube so as to control the on-off of the switching tube. When the sampling chip 1 outputs a high level, the micro control unit U5 stops sending the PWM signal to the logic level conversion chip U4, and at the same time, the logic level conversion chip U4 stops sending the converted PWM signal to the switching tube.
Specifically, when the three-phase VSR PFC converter works abnormally, and when any one of the a/B/C three phases has abnormal current, the voltage on the corresponding sampling resistor will be suddenly changed, and the voltage is sent to the input terminals in+ and IN-of the corresponding sampling chip 1.
When the sampling chip 1 detects that the voltage of IN+ and IN-does not exceed the set reference voltage, the output pin OUT outputs a low level, and the low level is sent to the logic level conversion chip U4 and the micro control unit U5 respectively. The micro control unit U5 sends PWM signals to the logic level conversion chip U4 through the G2/G3/G4/G5/G6/G7 PIN PIN, and the logic level conversion chip U4 converts the PWM signals into 5V PWM signals and sends the 5V PWM signals to the 6 switching tubes.
When the sampling chip 1 detects that the voltage of in+ and IN-exceeds the set reference voltage, the output pin OUT outputs a high level, and the high level is sent to the EN pin of the logic level conversion chip U4 and the operational amplifier U6, respectively. The operational amplifier U6 converts the high voltage into a logic signal and sends the logic signal to the OPC pin of the micro control unit U5, and the micro control unit U5 detects that the overcurrent protection is triggered multiple times and stops sending the PWM signal. The logic level conversion chip U4 closes the output pins B1/B2/B3/B4/B5/B6 thereof, and stops sending PWM signals. When the input current returns to normal, the logic level conversion chip U4 resumes the PWM output.
The invention can realize single instant current protection without shutdown and long-time input overcurrent protection.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. The utility model provides a protection circuit of PFC converter, the PFC converter includes sampling resistor and switch tube, sampling resistor is connected with the switch tube, and the electric wire netting current passes through sampling resistor transmits to the switch tube, its characterized in that, protection circuit of PFC converter includes: sampling chip and driving circuit;
The input end of the sampling chip is connected with the sampling resistor, and the sampling chip is used for detecting the voltage signal of the sampling resistor and outputting high level or low level according to the voltage signal of the sampling resistor;
the driving circuit is respectively connected with the output end of the sampling chip and the switching tube;
When the sampling chip outputs low level, the driving circuit outputs PWM signals to the switching tube so as to control the on-off of the switching tube;
and when the sampling chip outputs a high level, the driving circuit stops outputting PWM signals to the switching tube.
2. The protection circuit of the PFC converter of claim 1, wherein the grid current is a three-phase current; the number of the sampling resistors is three, and the sampling resistors are respectively an A-phase sampling resistor, a B-phase sampling resistor and a C-phase sampling resistor; the number of the sampling chips is three, and the sampling chips are an A-phase sampling chip, a B-phase sampling chip and a C-phase sampling chip respectively;
The input end of the A-phase sampling chip is connected with two ends of the A-phase sampling resistor, the A-phase sampling chip is used for detecting a voltage signal of the A-phase sampling resistor, outputting a high level when the voltage signal of the A-phase sampling resistor is larger than a set reference voltage, and outputting a low level when the voltage signal of the A-phase sampling resistor is smaller than or equal to the set reference voltage;
The input end of the B-phase sampling chip is connected with two ends of the B-phase sampling resistor, the B-phase sampling chip is used for detecting a voltage signal of the B-phase sampling resistor, outputting a high level when the voltage signal of the B-phase sampling resistor is larger than a set reference voltage, and outputting a low level when the voltage signal of the B-phase sampling resistor is smaller than or equal to the set reference voltage;
the input end of the C-phase sampling chip is connected with two ends of the C-phase sampling resistor, the C-phase sampling chip is used for detecting a voltage signal of the C-phase sampling resistor, outputting a high level when the voltage signal of the C-phase sampling resistor is larger than a set reference voltage, and outputting a low level when the voltage signal of the C-phase sampling resistor is smaller than or equal to the set reference voltage.
3. The protection circuit of the PFC converter of claim 1, wherein the drive circuit comprises: logic level conversion chip and micro control unit;
The input end of the logic level conversion chip is connected with the micro control unit, and the output end of the logic level conversion chip is connected with the switching tube; the micro control unit is also connected with the output end of the sampling chip;
When the sampling chip outputs low level, the micro control unit sends a PWM signal to the logic level conversion chip, the logic level conversion chip converts the PWM signal and sends the converted PWM signal to the switching tube so as to control the on-off of the switching tube;
And when the sampling chip outputs a high level, the micro control unit stops sending the PWM signal to the logic level conversion chip.
4. The PFC converter protection circuit of claim 3, wherein the OCP pin of the micro-control unit is connected to an output of the sampling chip.
5. The PFC converter protection circuit of claim 3, wherein the driver circuit further comprises an operational amplifier; the micro control unit is connected with the output end of the sampling chip through the operational amplifier.
6. The protection circuit of the PFC converter of claim 1, wherein the drive circuit comprises: logic level conversion chip and micro control unit;
the input end of the logic level conversion chip is respectively connected with the micro control unit and the sampling chip, and the output end of the logic level conversion chip is connected with the switching tube;
the micro control unit is used for sending PWM signals to the logic level conversion chip; the logic level conversion chip is used for converting the PWM signal;
when the sampling chip outputs low level, the logic level conversion chip sends a converted PWM signal to the switching tube so as to control the on-off of the switching tube;
And when the sampling chip outputs high level, the logic level conversion chip stops sending the converted PWM signal to the switching tube.
7. The PFC converter protection circuit of claim 6, wherein the EN pin of the logic level conversion chip is connected to the sampling chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410703517.0A CN118282186B (en) | 2024-06-03 | 2024-06-03 | Protection circuit of PFC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410703517.0A CN118282186B (en) | 2024-06-03 | 2024-06-03 | Protection circuit of PFC converter |
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| Publication Number | Publication Date |
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| CN118282186A true CN118282186A (en) | 2024-07-02 |
| CN118282186B CN118282186B (en) | 2024-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410703517.0A Active CN118282186B (en) | 2024-06-03 | 2024-06-03 | Protection circuit of PFC converter |
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| CN (1) | CN118282186B (en) |
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| US20230198381A1 (en) * | 2020-08-29 | 2023-06-22 | Huawei Digital Power Technologies Co., Ltd. | Power factor correction circuit and power converter |
| WO2023185189A1 (en) * | 2022-04-02 | 2023-10-05 | 华为数字能源技术有限公司 | Power control circuit and control method therefor |
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| CN101141100A (en) * | 2007-08-28 | 2008-03-12 | 清华大学 | LCL filtering based voltage type active rectifier steady control system and method |
| CN101552546A (en) * | 2008-04-02 | 2009-10-07 | 台达电子工业股份有限公司 | Bridgeless power factor circuit correcting circuit system used for critical conduction mode and control method thereof |
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| WO2023185189A1 (en) * | 2022-04-02 | 2023-10-05 | 华为数字能源技术有限公司 | Power control circuit and control method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118282186B (en) | 2024-08-30 |
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