CN217508279U - Low-voltage large-current direct-current input anti-reverse connection circuit with pre-charging function - Google Patents
Low-voltage large-current direct-current input anti-reverse connection circuit with pre-charging function Download PDFInfo
- Publication number
- CN217508279U CN217508279U CN202221411564.0U CN202221411564U CN217508279U CN 217508279 U CN217508279 U CN 217508279U CN 202221411564 U CN202221411564 U CN 202221411564U CN 217508279 U CN217508279 U CN 217508279U
- Authority
- CN
- China
- Prior art keywords
- module
- reverse connection
- voltage
- field
- output end
- Prior art date
- 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.)
- Active
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a low pressure heavy current direct current input prevents reverse-connection circuit with pre-charge function, including preventing reverse-connection module, pre-charge module and flyback power supply, flyback power supply includes RCD absorption circuit, prevent that reverse-connection module includes field effect transistor V1, pre-charge module includes field effect transistor V2, the input of preventing reverse-connection module is connected with DC power supply positive pole INP, the output of preventing reverse-connection module is connected with the input of pre-charge module, the first voltage output end of pre-charge module is connected with RCD absorption circuit's voltage input end, RCD absorption circuit's voltage output end is connected with the control end of preventing reverse-connection module and pre-charge module's control end, the second voltage output end of pre-charge module is connected with DC power supply negative pole INN. The utility model discloses a heavy current direct current input prevents reverse-connection circuit and possesses the function of charging in advance, has satisfied low power dissipation, small, requirement with low costs simultaneously.
Description
Technical Field
The utility model relates to a direct current input prevents reverse connection technical field, concretely relates to low pressure heavy current direct current input prevents reverse connection circuit with pre-charge function.
Background
The current common direct current input anti-reverse connection circuit is mainly divided into four types: the first type is that a diode is used for realizing reverse connection prevention, and the method has the problems of high loss and large heat, is mainly used for reverse connection prevention of low current and cannot realize capacitor pre-charging; the second type is that a relay is used for realizing reverse connection prevention and pre-charging, but large-current relays are large in size and inconvenient for product miniaturization; the third type is that an N-channel field effect transistor (placed on N) is used for reverse connection prevention protection, and the method can meet the requirements of high current and low loss, but can not realize pre-charging and has the problem of non-common ground; the fourth type is that a P-channel field effect transistor (placed on P) is used for reverse connection prevention protection, the problem that pre-charging cannot be achieved exists, and the P-channel field effect transistor is few in type and high in price.
SUMMERY OF THE UTILITY MODEL
The utility model provides a low pressure heavy current direct current input prevents reverse connection circuit with pre-charge function, its purpose: the defects of the prior art are overcome, the high-current direct-current input reverse connection prevention circuit has a pre-charging function, and the requirements of low power consumption, small size and low cost are met.
The utility model discloses technical scheme as follows:
a low-voltage large-current direct-current input reverse connection prevention circuit with a pre-charging function comprises a reverse connection prevention module, a pre-charging module and a flyback power supply, wherein the flyback power supply comprises an RCD absorption circuit, the reverse connection prevention module comprises a field-effect tube V1, the pre-charging module comprises a field-effect tube V2, the input end of the reverse connection prevention module is connected with an anode INP of the direct-current power supply, and the output end of the reverse connection prevention module is connected with the input end of the pre-charging module and used for controlling the pre-charging module to pre-charge; the first voltage output end P of the pre-charging module is connected with the voltage input end of the RCD absorption circuit, the voltage output end P10 of the RCD absorption circuit is connected with the control end of the reverse connection prevention module and the control end of the pre-charging module and used for controlling the conduction states of the field-effect tube V1 of the reverse connection prevention module and the field-effect tube V2 of the pre-charging module so as to achieve reverse connection prevention, and the second voltage output end N of the pre-charging module is connected with the negative electrode INN of the direct-current power supply.
Further, the reverse connection prevention module further comprises a diode D1, the anode of the diode D1 is connected with the control end of the reverse connection prevention module, the cathode of the diode D1 is connected with the gate of the field-effect tube V1 through a resistor R1, the source of the field-effect tube V1 is connected with the input end of the reverse connection prevention module, the drain of the field-effect tube V1 is connected with the output end of the reverse connection prevention module, and a capacitor C1 and a resistor R2 which are connected in parallel are arranged between the gate and the source of the field-effect tube V1.
Further, the pre-charging module further comprises NTC resistors R5 and R6 connected in parallel, one parallel end of each of the resistors R5 and R6 is connected to the first voltage output end P of the pre-charging module, the other parallel end of each of the resistors R5 and R6 is connected to the input end of the pre-charging module, the input end of the pre-charging module is further connected to the drain of the field-effect transistor V2, the gate of the field-effect transistor V2 is connected to the control end of the pre-charging module through the resistor R4, the source of the field-effect transistor V2 is connected to the first voltage output end P of the pre-charging module, a capacitor C2 and a resistor R3 connected in parallel are arranged between the gate and the source of the field-effect transistor V2, and a plurality of electrolytic capacitors connected in parallel are arranged between the first voltage output end P and the second voltage output end N of the pre-charging module.
Furthermore, the RCD absorption circuit comprises resistors R8, R9 and R10 connected in parallel, first parallel ends of the resistors R8, R9 and R10 are connected with a voltage output end P10 of the RCD absorption circuit, a capacitor C3 and a voltage regulator tube Z1 connected in parallel are arranged between the voltage output end P10 of the RCD absorption circuit and a voltage input end of the RCD absorption circuit, a forward current conduction direction of the voltage regulator tube Z1 is that the voltage input end of the RCD absorption circuit points to the voltage output end P10 of the RCD absorption circuit, and the voltage input end of the RCD absorption circuit is connected with the first input end of the flyback power transformer; the second parallel ends of the resistors R8, R9 and R10 are connected with the cathode of the diode D3, the anode of the diode D3 is connected with the drain of the flyback power switch tube V3 and the second input end of the flyback power transformer, and the second parallel ends of the resistors R8, R9 and R10 are also connected with the voltage input end of the RCD absorption circuit through the capacitor C7.
Compared with the prior art, the utility model discloses following beneficial effect has: the input reverse connection preventing and pre-charging circuit is combined with the flyback power supply circuit, the field effect tube with low internal resistance is used as a switch to control the on-off of high current, and the characteristic that the voltage of an RCD absorption circuit of the flyback power supply is higher than that of a P bus is used for driving the field effect tube, so that the high-current direct current input reverse connection preventing circuit has a pre-charging function, and the requirements of low power consumption, small size and low cost are met.
Drawings
FIG. 1 is a circuit configuration diagram of an anti-reverse module and a pre-charge module;
fig. 2 is a circuit configuration diagram of the flyback power supply;
fig. 3 is a circuit configuration diagram of an RCD snubber circuit.
Detailed Description
The technical scheme of the utility model is explained in detail below with the attached drawings:
as shown in fig. 1, an anti-reverse connection circuit with a precharge function for low-voltage large-current direct-current input comprises an anti-reverse connection module 1, a precharge module 2 and a flyback power supply, wherein the flyback power supply comprises an RCD absorption circuit 3, the anti-reverse connection module 1 comprises a field-effect tube V1, the precharge module 2 comprises a field-effect tube V2, the input end of the anti-reverse connection module 1 is connected with an anode INP of the direct-current power supply, and the output end of the anti-reverse connection module 1 is connected with the input end of the precharge module 2, so as to control the precharge module 2 to precharge; the first voltage output end P of the pre-charging module 2 is connected with the voltage input end of the RCD absorption circuit 3, the voltage output end P10 of the RCD absorption circuit 3 is connected with the control end of the reverse connection prevention module 1 and the control end of the pre-charging module 2, and is used for controlling the conduction states of the field-effect tube V1 of the reverse connection prevention module 1 and the field-effect tube V2 of the pre-charging module 2 to realize reverse connection prevention, and the second voltage output end N of the pre-charging module 2 is connected with the negative electrode INN of the direct current power supply.
The reverse connection prevention module 1 further comprises a diode D1, the anode of the diode D1 is connected with the control end of the reverse connection prevention module 1, the cathode of the diode D1 is connected with the gate of the field-effect tube V1 through a resistor R1, the source of the field-effect tube V1 is connected with the input end of the reverse connection prevention module 1, the drain of the field-effect tube V1 is connected with the output end of the reverse connection prevention module 1, and a capacitor C1 and a resistor R2 which are connected in parallel are arranged between the gate and the source of the field-effect tube V1.
The pre-charging module 2 further comprises NTC resistors R5 and R6 which are connected in parallel, one parallel end of each of the resistors R5 and R6 is connected with the first voltage output end P of the pre-charging module 2, the other parallel end of each of the resistors R5 and R6 is connected with the input end of the pre-charging module 2, the input end of the pre-charging module 2 is further connected with the drain electrode of the field-effect tube V2, the grid electrode of the field-effect tube V2 is connected with the control end of the pre-charging module 2 through the resistor R4, the source electrode of the field-effect tube V2 is connected with the first voltage output end P of the pre-charging module 2, a capacitor C2 and a resistor R3 which are connected in parallel are arranged between the grid electrode and the source electrode of the field-effect tube V2, and a plurality of electrolytic capacitors which are connected in parallel are arranged between the first voltage output end P and the second voltage output end N of the pre-charging module 2.
As shown in fig. 2 and fig. 3, the RCD snubber circuit 3 includes resistors R8, R9, and R10 connected in parallel, first parallel terminals of the resistors R8, R9, and R10 are connected to a voltage output terminal P10 of the RCD snubber circuit 3, a capacitor C3 and a voltage regulator tube Z1 connected in parallel are disposed between the voltage output terminal P10 of the RCD snubber circuit 3 and a voltage input terminal of the RCD snubber circuit 3, a forward current conduction direction of the voltage regulator tube Z1 is from the voltage input terminal of the RCD snubber circuit 3 to the voltage output terminal P10 of the RCD snubber circuit 3, and the voltage input terminal of the RCD snubber circuit 3 is connected to a first input terminal of the flyback power transformer; the second parallel ends of the resistors R8, R9 and R10 are connected to the cathode of the diode D3, the anode of the diode D3 is connected to the drain of the flyback power switching tube V3 and the second input end of the flyback power transformer, and the second parallel ends of the resistors R8, R9 and R10 are further connected to the voltage input end of the RCD snubber circuit 3 through the capacitor C7.
The scheme improves the traditional RCD absorption circuit 3 of the flyback power supply, so that the RCD absorption circuit 3 can output 10V stable voltage higher than a P bus. When the flyback power supply normally works, the voltage at two ends of the capacitor C7 is far higher than 10V, the resistors R8, R9, R10, the voltage regulator tube Z1 and the capacitor C3 form a series voltage stabilizing circuit, the voltage value of the voltage regulator tube Z1 is 10V, therefore, the stable 10V voltage can be obtained at two ends of the capacitor C3, and the group of power supplies is named as P + 10V.
When a forward direct current input voltage is applied to the input terminals INP and INN of the direct current power supply (INP is positive INN and negative INN), at this time, current flows from the INP through a body diode of the field effect transistor V1, electrolytic capacitors E1, E2, E3, E4, E5, and E6 are charged through NTC resistors R5 and R6, and after the electrolytic capacitors E1, E2, E3, E4, E5, and E6 are charged to a certain voltage, the flyback power supply operates, and the P +10V power supply is established. The P +10V power supply firstly drives the field effect transistor V2 to be conducted, the NTC resistors R5 and R6 are bypassed, after the field effect transistor V2 is conducted, the grid voltage of the field effect transistor V1 is higher than the source voltage by 10V, the field effect transistor V1 also enters a saturated state, and at the moment, the normal conduction process is completed. In the charging process of the electrolytic capacitors E1, E2, E3, E4, E5 and E6, the grid voltage of the field-effect tube V1 is lower than the source voltage, the voltage difference exceeds 20V and damages the field-effect tube V1, and the diode D1 can effectively avoid the situation that the grid voltage of the field-effect tube V1 is lower than the source voltage.
When the direct current input voltages (INP is negative INN is positive) are applied to the input terminals INP and INN of the direct current power supply, the body diode of the field-effect tube V1 is in a reverse bias state, the body diode of the field-effect tube V1 cannot be turned on, the electrolytic capacitors E1, E2, E3, E4, E5 and E6 cannot be charged, the flyback power supply cannot work, and the field-effect tubes V1 and V2 cannot be turned on, so that the function of preventing the reverse connection is realized.
The circuit can be extended, and a field effect transistor V1, resistors R1 and R2, a capacitor C1 and a diode D1 are matched with a P +10V power supply of a flyback power supply, so that the function of preventing reverse connection of input is realized independently; the field effect transistor V2, the resistors R3 and R4 and the capacitor C2 can be matched with a P +10V power supply of a flyback power supply to independently realize the electrolytic capacitor pre-charging function.
After the reverse connection preventing circuit enters a normal working state, the internal resistance of the whole input circuit is R of a field effect tube V1 and a field effect tube V2 DSON The sum is usually several milliohms, a 100V/1.5m omega-shaped field effect tube is selected during the experiment, the volume of the field effect tube is 12 x 10 x 2.2mm, and the R of the field effect tube DSON The sum of which is 3 milliohms, falseThe working current is 50A, the total power consumption of the reverse connection preventing module 1 and the pre-charging module 2 is 7.5W, if the reverse connection preventing processing is performed by using a diode, the voltage drop of the diode is about 1.2V, and the power consumption when the working current is 50A is 60W which is far higher than that of the circuit.
In practical engineering application, the circuit is used for preventing reverse connection of the input of the 48V direct current inverter. The field effect transistors V1 and V2 use IPT015N10N5, the total internal resistance of the reverse connection preventing module 1 and the pre-charging module 2 is 3m Ω, and the working requirement of the system can be met without additionally installing cooling fins. In an RCD absorption circuit 3 of a flyback power supply, a voltage regulator tube Z1 is a 10V voltage regulator tube, a capacitor C7 is in a 100V/104 specification, a capacitor C3 is in a 50V/1UF specification, and a resistor R8/R9/R10 is in a 10K/1/8W specification.
The circuit is suitable for products with direct current power supply and is matched with a flyback power supply in the products for use. The reverse connection preventing circuit uses the field effect transistor as a current switch, uses the stable voltage output by the RCD absorption circuit of the flyback power supply as a voltage driving source of the field effect transistor, effectively reduces the product volume, reduces the power consumption, improves the reliability, and can be used in the fields of low-voltage motor driving of direct current power supply, an inverter, a UPS, DC-DC and the like.
Claims (4)
1. The utility model provides a low pressure heavy current direct current input prevents reverse connection circuit with pre-charge function which characterized in that: the flyback power supply comprises an anti-reverse connection module (1), a pre-charging module (2) and a flyback power supply, wherein the flyback power supply comprises an RCD absorption circuit (3), the anti-reverse connection module (1) comprises a field effect tube V1, the pre-charging module (2) comprises a field effect tube V2, the input end of the anti-reverse connection module (1) is connected with a direct-current power supply positive electrode INP, and the output end of the anti-reverse connection module (1) is connected with the input end of the pre-charging module (2) and used for controlling the pre-charging module (2) to pre-charge; the first voltage output end P of the pre-charging module (2) is connected with the voltage input end of the RCD absorption circuit (3), the voltage output end P10 of the RCD absorption circuit (3) is connected with the control end of the anti-reverse connection module (1) and the control end of the pre-charging module (2) and used for controlling the conduction states of a field-effect tube V1 of the anti-reverse connection module (1) and a field-effect tube V2 of the pre-charging module (2) to achieve anti-reverse connection, and the second voltage output end N of the pre-charging module (2) is connected with a direct-current power supply negative electrode INN.
2. A low-voltage high-current direct-current input anti-reverse connection circuit with a pre-charging function according to claim 1, wherein: the reverse connection prevention module (1) further comprises a diode D1, the anode of the diode D1 is connected with the control end of the reverse connection prevention module (1), the cathode of the diode D1 is connected with the grid of the field-effect tube V1 through a resistor R1, the source of the field-effect tube V1 is connected with the input end of the reverse connection prevention module (1), the drain of the field-effect tube V1 is connected with the output end of the reverse connection prevention module (1), and a capacitor C1 and a resistor R2 which are connected in parallel are arranged between the grid and the source of the field-effect tube V1.
3. The low-voltage high-current direct-current input anti-reverse connection circuit with the pre-charging function of claim 1, wherein: the pre-charging module (2) further comprises NTC resistors R5 and R6 which are connected in parallel, one parallel end of each of the resistors R5 and R6 is connected with a first voltage output end P of the pre-charging module (2), the other parallel end of each of the resistors R5 and R6 is connected with an input end of the pre-charging module (2), the input end of the pre-charging module (2) is further connected with a drain electrode of a field-effect tube V2, a grid electrode of the field-effect tube V2 is connected with a control end of the pre-charging module (2) through a resistor R4, a source electrode of a field-effect tube V2 is connected with the first voltage output end P of the pre-charging module (2), a capacitor C2 and a resistor R3 which are connected in parallel are arranged between the grid electrode and the source electrode of the field-effect tube V2, and a plurality of electrolytic capacitors which are connected in parallel are arranged between the first voltage output end P and a second voltage output end N of the pre-charging module (2).
4. The low-voltage high-current direct-current input anti-reverse connection circuit with the pre-charging function of claim 1, wherein: the RCD absorption circuit (3) comprises resistors R8, R9 and R10 which are connected in parallel, the first parallel ends of the resistors R8, R9 and R10 are connected with a voltage output end P10 of the RCD absorption circuit (3), a capacitor C3 and a voltage regulator tube Z1 which are connected in parallel are arranged between the voltage output end P10 of the RCD absorption circuit (3) and the voltage input end of the RCD absorption circuit (3), the forward current conduction direction of the voltage regulator tube Z1 is that the voltage input end of the RCD absorption circuit (3) points to the voltage output end P10 of the RCD absorption circuit (3), and the voltage input end of the RCD absorption circuit (3) is connected with the first input end of the flyback power transformer; the second parallel ends of the resistors R8, R9 and R10 are connected with the cathode of the diode D3, the anode of the diode D3 is connected with the drain of the flyback power switch tube V3 and the second input end of the flyback power transformer, and the second parallel ends of the resistors R8, R9 and R10 are also connected with the voltage input end of the RCD absorption circuit (3) through the capacitor C7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221411564.0U CN217508279U (en) | 2022-06-08 | 2022-06-08 | Low-voltage large-current direct-current input anti-reverse connection circuit with pre-charging function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221411564.0U CN217508279U (en) | 2022-06-08 | 2022-06-08 | Low-voltage large-current direct-current input anti-reverse connection circuit with pre-charging function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217508279U true CN217508279U (en) | 2022-09-27 |
Family
ID=83359453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221411564.0U Active CN217508279U (en) | 2022-06-08 | 2022-06-08 | Low-voltage large-current direct-current input anti-reverse connection circuit with pre-charging function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217508279U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115313345A (en) * | 2022-10-12 | 2022-11-08 | 成都新欣神风电子科技有限公司 | Reverse connection prevention protection circuit for direct-current power supply |
-
2022
- 2022-06-08 CN CN202221411564.0U patent/CN217508279U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115313345A (en) * | 2022-10-12 | 2022-11-08 | 成都新欣神风电子科技有限公司 | Reverse connection prevention protection circuit for direct-current power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10790742B1 (en) | Multi-level power converter with improved transient load response | |
| CN107294366B (en) | Pre-charging circuit, direct current-direct current converter and hybrid electric vehicle | |
| CN217508279U (en) | Low-voltage large-current direct-current input anti-reverse connection circuit with pre-charging function | |
| CN106026643A (en) | High-voltage-gain DC-DC converter integrating switching capacitor and coupling inductor | |
| CN201966801U (en) | Voltage resistance circuit | |
| CN102904329A (en) | Power supply management circuit | |
| CN113285584A (en) | Pre-charging circuit based on negative electrode pre-charging and flying capacitor three-level converter | |
| TW201503561A (en) | Interleaving DC-DC converter and reversible multiple-input interleaving DC-DC converter | |
| CN111049379A (en) | Charge-discharge type DC-DC conversion circuit and charge-discharge system thereof | |
| CN212969451U (en) | Three-level BOOST device | |
| CN211456754U (en) | Portable power source of step-down output | |
| CN111313509A (en) | High-voltage boosting charger battery reverse connection protection circuit | |
| CN101420123B (en) | Solar energy controller preventing reverse connection of accumulator | |
| CN207368744U (en) | Power supply power switching circuit | |
| CN212304777U (en) | Single-circuit battery discharge circuit | |
| CN215817567U (en) | Surge suppression and reverse connection prevention protection circuit and charger | |
| CN212909346U (en) | Boost power conversion circuit | |
| CN212171938U (en) | Pre-charging device for high-voltage bus capacitor of new energy automobile | |
| CN211880147U (en) | Reverse-current-preventing MOS tube driving power supply generation circuit | |
| CN212258783U (en) | Direct current power conversion circuit | |
| CN203205871U (en) | Direct current reverse protection circuit | |
| CN211456768U (en) | High-voltage boosting charger battery reverse connection protection circuit | |
| CN111251941A (en) | Pre-charging device for high-voltage bus capacitor of new energy automobile | |
| CN215071640U (en) | Bidirectional voltage balance slow start circuit | |
| CN220865567U (en) | Electric motor cycle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |