CN116667303A - Input anti-reverse connection circuit of DC power supply - Google Patents
Input anti-reverse connection circuit of DC power supply Download PDFInfo
- Publication number
- CN116667303A CN116667303A CN202310934661.0A CN202310934661A CN116667303A CN 116667303 A CN116667303 A CN 116667303A CN 202310934661 A CN202310934661 A CN 202310934661A CN 116667303 A CN116667303 A CN 116667303A
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- China
- Prior art keywords
- voltage
- power supply
- reverse connection
- mos tube
- direct current
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 35
- 230000001629 suppression Effects 0.000 claims abstract description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 description 4
- 102100028680 Protein patched homolog 1 Human genes 0.000 description 3
- 101710161390 Protein patched homolog 1 Proteins 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
- H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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- 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
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- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses an input anti-reverse connection circuit of a DC power supply, wherein the positive electrode of an input capacitor is connected with the positive electrode of a direct current input end; the drain electrode of the first MOS tube is connected with the cathode of the direct current input end, and the drain electrode of the second MOS tube is connected with the cathode of the input capacitor; the surge suppression thermistor is connected with the second MOS tube in parallel, the auxiliary power supply is powered by the input capacitor, the MOS tube driving circuit comprises a voltage dividing circuit and a PNP triode, and the grid electrode of the MOS tube is connected with the anode of the auxiliary power supply through a pull-up resistor; the voltage dividing circuit is connected between the positive pole and the negative pole of the direct current input end, the emitter of the PNP triode is connected with the grid electrode of the MOS tube, the base electrode of the PNP triode is connected with the voltage signal output end of the voltage dividing circuit, and the collector of the PNP triode is connected with the negative pole of the direct current input end. The MOS is turned on and off by the auxiliary power supply and the input voltage, the problem that the MOS tube is damaged when the power supply is in a rapid switching action under the condition of no-load is solved, and the reliability of the reverse connection preventing circuit is good.
Description
Technical Field
The invention relates to a reverse connection preventing circuit, in particular to an input reverse connection preventing circuit of a DC power supply.
Background
Along with the trend of diversified product types in the power industry, a DC-DC conversion power supply using direct current DC input also becomes an important component part, and a circuit using direct current input is used for input, so that an anti-reverse connection circuit or a relay is required to be input in series at an input end to improve the safety and reliability of the circuit, compared with a relay, the cost of the anti-reverse connection MOS is relatively low, the traditional use of input to drive the anti-reverse connection MOS is that the capacitor voltage drops slowly due to the switching on and switching off of an idle state, and the anti-reverse connection MOS drops to the conduction critical voltage of an MOS tube, then input is electrified, larger surge current can pass through the anti-reverse connection MOS, the MOS is possibly damaged, and the reliability of the anti-reverse connection circuit is poor.
Disclosure of Invention
The invention aims to provide an input reverse connection preventing circuit of a DC power supply with good reliability.
In order to solve the technical problem, the invention adopts the technical scheme that the input anti-reverse connection circuit of the DC power supply comprises a direct current input end, an input capacitor, a surge suppression thermistor, two anti-reverse connection MOS tubes, an MOS tube driving circuit and an auxiliary power supply, wherein the positive electrode of the input capacitor is connected with the positive electrode of the direct current input end; the drain electrodes of the two anti-reverse MOS tubes are connected with the negative electrode of the direct current input end, and the drain electrode of the second anti-reverse MOS tube is connected with the negative electrode of the input capacitor; the surge suppression thermistor is connected with the second anti-reverse MOS tube in parallel, the auxiliary power supply is powered by the input capacitor, the MOS tube driving circuit comprises a voltage dividing circuit and a PNP triode, and the grid electrode of the anti-reverse MOS tube is connected with the anode of the auxiliary power supply through the pull-up resistor; the voltage dividing circuit is connected between the positive pole and the negative pole of the direct current input end, the emitter of the PNP triode is connected with the grid electrode of the anti-reverse MOS tube, the base electrode of the PNP triode is connected with the voltage signal output end of the voltage dividing circuit, and the collector of the PNP triode is connected with the negative pole of the direct current input end.
The input anti-reverse connection circuit of the DC power supply comprises a first voltage stabilizing tube and a voltage dividing resistor. The anode of the first voltage stabilizing tube is connected with the source electrode of the anti-reverse MOS tube, the cathode is connected with the grid electrode of the anti-reverse MOS tube, and the voltage dividing resistor is connected with the first voltage stabilizing tube in parallel.
The input anti-reverse connection circuit of the DC power supply comprises a current-limiting resistor and a second voltage stabilizing tube, wherein the base electrode of the PNP triode is connected with the voltage signal output end of the voltage dividing circuit through the current-limiting resistor; the cathode of the second voltage stabilizing tube is connected with the voltage signal output end of the voltage dividing circuit, and the anode is connected with the cathode of the direct current input end.
The input reverse connection preventing circuit of the DC power supply comprises the following two reverse connection preventing MOS transistors: when the direct current input end is electrified, current flows through the surge suppression thermistor from the positive electrode of the direct current input end to the input capacitor, and returns to the negative electrode of the direct current input end through the body diode of the first anti-reverse MOS tube, and the input capacitor is slowly charged; when the voltage of the input capacitor rises to the working threshold of the auxiliary power supply management chip, the output voltage of the auxiliary power supply starts to rise; the output voltage of the auxiliary power supply rises to the voltage of the reverse connection preventing MOS tube which is fully conducted, the two reverse connection preventing MOS tubes are turned on, and then the output voltage of the auxiliary power supply rises to the rated voltage of the auxiliary power supply, namely the normal working time of the auxiliary power supply is delayed from the time of the reverse connection preventing MOS tube which is fully conducted.
The input anti-reverse connection circuit of the DC power supply has the following turn-off processes of the two anti-reverse connection MOS transistors: the working voltage of the auxiliary power supply management chip is lower than the rated voltage of the direct current input end, when the direct current input end is powered down, the voltage of the input capacitor starts to be reduced, and the voltage of the auxiliary power supply is still maintained at the rated voltage before the input capacitor is powered down to the threshold voltage for switching off the auxiliary power supply; when the direct current input end is powered down, the voltage of the base electrode of the PNP triode Q3 is reduced and is lower than the voltage of the emitter electrode, the PNP triode is turned on, the grid electrode of the anti-reverse MOS tube is pulled down to a low level, and the turn-off of the anti-reverse MOS tube is realized.
The MOS is turned on and off by the auxiliary power supply and the input voltage, the problem that the MOS tube is damaged when the power supply is in a rapid switching action under the condition of no-load is solved, and the reliability of the reverse connection preventing circuit is good.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a circuit diagram of a DC power input anti-reverse circuit in accordance with an embodiment of the present invention.
Detailed Description
The structure and principle of the DC power supply input reverse connection prevention circuit are shown in fig. 1, the DC power supply input reverse connection prevention circuit comprises a direct current input end, an input capacitor C1, a surge suppression thermistor PTC1, a first reverse connection prevention MOS tube Q1, a second reverse connection prevention MOS tube Q2, a MOS tube driving circuit and an auxiliary power supply, the positive electrode of the input capacitor C1 is connected with the positive electrode 40VDC+ of the direct current input end, the negative electrode of the input capacitor C1 is grounded, and the positive electrode and the negative electrode of the DC module input end of the DC power supply are respectively connected with the positive electrode and the negative electrode of the input capacitor C1. The source electrode of the first reverse connection preventing MOS tube Q1 is connected with the source electrode of the second reverse connection preventing MOS tube Q2. The drain electrode of the first anti-reverse-connection MOS tube Q1 is connected with the negative electrode DC-of the direct current input end, and the drain electrode of the second anti-reverse-connection MOS tube is connected with the negative electrode of the input capacitor C1. The surge suppression thermistor PTC1 is connected in parallel with a second anti-reverse connection MOS tube, an auxiliary power supply is powered by an input capacitor C1, the MOS tube driving circuit comprises a voltage dividing circuit and a PNP triode, the voltage dividing circuit is formed by sequentially connecting a resistor R4, a resistor R5 and a resistor R6 in series, one end of the voltage dividing circuit resistor R4 is connected with a positive electrode 40VDC+ of a direct current input end, and one end of the voltage dividing circuit resistor R6 is connected with a negative electrode DC-of the direct current input end.
The grids of the two anti-reverse MOS tubes Q1 and Q2 are connected with the positive pole +12V of the auxiliary power supply through a pull-up resistor R7. The emitter of PNP triode Q3 connects the grid of two anti-reverse MOS transistors Q1 and Q2, the base of PNP triode Q3 connects the voltage signal output end (the connection point of resistor R5 and resistor R6) of the voltage divider circuit through the current-limiting resistor R1, the collector of PNP triode Q3 connects the negative pole DC-of the direct current input end.
The anode of the first voltage stabilizing tube Z1 is connected with the source electrodes of the two anti-reverse MOS tubes Q1 and Q2, the cathode is connected with the grid electrodes of the two anti-reverse MOS tubes Q1 and Q2, and the voltage dividing resistor formed by parallel connection of the resistor R2 and the resistor R3 is connected with the first voltage stabilizing tube Z1 in parallel. The cathode of the second voltage stabilizing tube Z2 is connected with the voltage signal output end of the voltage dividing circuit, and the anode is connected with the cathode DC-of the direct current input end.
In this embodiment, the voltage at the dc input terminal is 40Vdc, and the voltage at the auxiliary power supply is 12Vdc.
The reverse connection preventing MOS tube is turned on in the following process, when the input 40VDC+ of the direct current input end is electrified, current flows from the positive electrode of the direct current input end to the input capacitor C1, from the positive electrode of the input capacitor C1 to the negative electrode, then flows through the surge suppression thermistor PTC1, then flows through the body diode of the reverse connection preventing MOS tube Q1 on the outer side of the reverse connection preventing MOS tube, returns to the negative electrode DC-of the direct current input end, slow charging of the input capacitor is realized, when the voltage of the input capacitor C1 in the power supply rises to the working threshold of the auxiliary power supply management IC, the output voltage of the auxiliary power supply starts to rise, the fully conducted voltage of the reverse connection preventing MOS tube is firstly risen, and then rises to +12V, at the moment, the DC power supply internal management IC starts to work, namely the normal rising working time of the auxiliary power supply is delayed from the fully conducted time of the reverse connection preventing MOS tube, when the reverse connection preventing MOS tube is in a critical conducting state, then the reverse connection preventing MOS tube is damaged due to the fact that the large current with a load carrier flows through the reverse connection preventing MOS tube in the critical conducting state.
With the conditions and parameters given in this embodiment, the turn-off process of the reverse connection preventing MOS transistor is as follows, when the DC input terminal 40vdc+ is powered down, the voltage of the input capacitor C1 starts to decrease, and since the input of the auxiliary power supply is provided by the input capacitor C1, the working voltage of the auxiliary power supply management IC is lower than the actual input voltage, so as to accelerate the DC power supply start-up speed. Therefore, when the input 40vdc+ is powered down, the voltage of the auxiliary power supply is still maintained at 12VDC before the input capacitor C1 drops to the threshold voltage for turning off the auxiliary power supply, the voltage of the base electrode of the PNP triode Q3 drops due to the dc input end and is lower than the voltage of the emitter, the PNP triode is turned on, the gates of the anti-reverse MOS transistors Q1 and Q2 are pulled down to a low level, and the turn-off of the anti-reverse MOS transistors Q1 and Q2 is realized.
According to the embodiment of the invention, the MOS is turned on and off through the auxiliary power supply and the input voltage, so that the problem that the MOS tube is damaged when the power supply is in a rapid switching action under the no-load condition is solved, and the reliability of the reverse connection preventing circuit is improved.
Claims (5)
1. The input anti-reverse connection circuit of the DC power supply comprises a direct current input end, an input capacitor, a surge suppression thermistor, two anti-reverse connection MOS tubes, an MOS tube driving circuit and an auxiliary power supply, wherein the positive electrode of the input capacitor is connected with the positive electrode of the direct current input end; the drain electrodes of the two anti-reverse MOS tubes are connected with the negative electrode of the direct current input end, and the drain electrode of the second anti-reverse MOS tube is connected with the negative electrode of the input capacitor; the surge suppression thermistor is connected in parallel with the second anti-reverse connection MOS tube, and is characterized in that an auxiliary power supply is powered by an input capacitor, the MOS tube driving circuit comprises a voltage dividing circuit and a PNP triode, and the grid electrode of the anti-reverse connection MOS tube is connected with the positive electrode of the auxiliary power supply through a pull-up resistor; the voltage dividing circuit is connected between the positive pole and the negative pole of the direct current input end, the emitter of the PNP triode is connected with the grid electrode of the anti-reverse MOS tube, the base electrode of the PNP triode is connected with the voltage signal output end of the voltage dividing circuit, and the collector of the PNP triode is connected with the negative pole of the direct current input end.
2. The input anti-reverse connection circuit of a DC power supply according to claim 1, comprising a first voltage stabilizing tube and a voltage dividing resistor, wherein the anode of the first voltage stabilizing tube is connected with the source electrode of the anti-reverse connection MOS tube, the cathode is connected with the grid electrode of the anti-reverse connection MOS tube, and the voltage dividing resistor is connected with the first voltage stabilizing tube in parallel.
3. The input anti-reverse connection circuit of the DC power supply according to claim 1, wherein the input anti-reverse connection circuit comprises a current limiting resistor and a second voltage stabilizing tube, and the base electrode of the PNP triode is connected with the voltage signal output end of the voltage dividing circuit through the current limiting resistor; the cathode of the second voltage stabilizing tube is connected with the voltage signal output end of the voltage dividing circuit, and the anode is connected with the cathode of the direct current input end.
4. The input anti-reverse connection circuit of a DC power supply according to claim 1, wherein the two anti-reverse connection MOS transistors are turned on as follows: when the direct current input end is electrified, current flows through the surge suppression thermistor from the positive electrode of the direct current input end to the input capacitor, and returns to the negative electrode of the direct current input end through the body diode of the first anti-reverse MOS tube, and the input capacitor is slowly charged; when the voltage of the input capacitor rises to the working threshold of the auxiliary power supply management chip, the output voltage of the auxiliary power supply starts to rise; the output voltage of the auxiliary power supply rises to the voltage of the reverse connection preventing MOS tube which is fully conducted, the two reverse connection preventing MOS tubes are turned on, and then the output voltage of the auxiliary power supply rises to the rated voltage of the auxiliary power supply, namely the normal working time of the auxiliary power supply is delayed from the time of the reverse connection preventing MOS tube which is fully conducted.
5. The input anti-reverse connection circuit of a DC power supply according to claim 1, wherein the turn-off process of the two anti-reverse connection MOS transistors is as follows: the working voltage of the auxiliary power supply management chip is lower than the rated voltage of the direct current input end, when the direct current input end is powered down, the voltage of the input capacitor starts to be reduced, and the voltage of the auxiliary power supply is still maintained at the rated voltage before the input capacitor is powered down to the threshold voltage for switching off the auxiliary power supply; when the direct current input end is powered down, the voltage of the base electrode of the PNP triode Q3 is reduced and is lower than the voltage of the emitter electrode, the PNP triode is turned on, the grid electrode of the anti-reverse MOS tube is pulled down to a low level, and the turn-off of the anti-reverse MOS tube is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310934661.0A CN116667303A (en) | 2023-07-28 | 2023-07-28 | Input anti-reverse connection circuit of DC power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310934661.0A CN116667303A (en) | 2023-07-28 | 2023-07-28 | Input anti-reverse connection circuit of DC power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116667303A true CN116667303A (en) | 2023-08-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310934661.0A Pending CN116667303A (en) | 2023-07-28 | 2023-07-28 | Input anti-reverse connection circuit of DC power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116667303A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005051919A (en) * | 2003-07-28 | 2005-02-24 | Matsushita Electric Works Ltd | Power supply |
| CN106533144A (en) * | 2016-10-28 | 2017-03-22 | 海能达通信股份有限公司 | Reverse connection and current backfeed prevention circuit |
| WO2018076294A1 (en) * | 2016-10-28 | 2018-05-03 | 海能达通信股份有限公司 | Reverse connection and current backflow prevention circuit |
| CN111884193A (en) * | 2020-08-18 | 2020-11-03 | 成都天锐星通科技有限公司 | Reverse connection preventing circuit and reverse connection preventing equipment |
| CN212162803U (en) * | 2020-06-29 | 2020-12-15 | 成都新欣神风电子科技有限公司 | Impact current suppression and reverse connection prevention protection circuit |
| CN113809730A (en) * | 2021-11-08 | 2021-12-17 | 深圳市高斯宝电气技术有限公司 | High-voltage direct-current input reverse connection protection circuit |
| CN217486178U (en) * | 2022-05-16 | 2022-09-23 | 深圳市高斯宝电气技术有限公司 | Reverse connection preventing circuit for direct current input |
| CN217935089U (en) * | 2022-06-06 | 2022-11-29 | 深圳市高斯宝电气技术有限公司 | Reverse connection prevention and impact prevention circuit |
| CN115986689A (en) * | 2022-12-12 | 2023-04-18 | 贵阳航空电机有限公司 | Anti-reverse connection circuit for inhibiting starting impact of direct-current power supply |
-
2023
- 2023-07-28 CN CN202310934661.0A patent/CN116667303A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005051919A (en) * | 2003-07-28 | 2005-02-24 | Matsushita Electric Works Ltd | Power supply |
| CN106533144A (en) * | 2016-10-28 | 2017-03-22 | 海能达通信股份有限公司 | Reverse connection and current backfeed prevention circuit |
| WO2018076294A1 (en) * | 2016-10-28 | 2018-05-03 | 海能达通信股份有限公司 | Reverse connection and current backflow prevention circuit |
| CN212162803U (en) * | 2020-06-29 | 2020-12-15 | 成都新欣神风电子科技有限公司 | Impact current suppression and reverse connection prevention protection circuit |
| CN111884193A (en) * | 2020-08-18 | 2020-11-03 | 成都天锐星通科技有限公司 | Reverse connection preventing circuit and reverse connection preventing equipment |
| CN113809730A (en) * | 2021-11-08 | 2021-12-17 | 深圳市高斯宝电气技术有限公司 | High-voltage direct-current input reverse connection protection circuit |
| CN217486178U (en) * | 2022-05-16 | 2022-09-23 | 深圳市高斯宝电气技术有限公司 | Reverse connection preventing circuit for direct current input |
| CN217935089U (en) * | 2022-06-06 | 2022-11-29 | 深圳市高斯宝电气技术有限公司 | Reverse connection prevention and impact prevention circuit |
| CN115986689A (en) * | 2022-12-12 | 2023-04-18 | 贵阳航空电机有限公司 | Anti-reverse connection circuit for inhibiting starting impact of direct-current power supply |
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