CN211296555U - Pre-charging circuit for high-power vehicle-mounted power supply - Google Patents
Pre-charging circuit for high-power vehicle-mounted power supply Download PDFInfo
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- CN211296555U CN211296555U CN202020197078.8U CN202020197078U CN211296555U CN 211296555 U CN211296555 U CN 211296555U CN 202020197078 U CN202020197078 U CN 202020197078U CN 211296555 U CN211296555 U CN 211296555U
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Abstract
The utility model provides a pre-charge circuit for high-power vehicle mounted power, this circuit contain an on-vehicle high voltage battery detection circuitry, an input voltage detection circuitry, a pre-charge circuit, a drive circuit, a first electric capacity and DC-DC electrical power generating system power level, its characterized in that, pre-charge circuit comprises a pre-charge resistance and two at least controllable electronic switch pipes parallelly connected, on-vehicle high voltage battery is connected to its one end, DC-DC electrical power generating system's input electric capacity is connected to one end in addition. The utility model provides a this kind of vehicle mounted power supply is circuit in advance utilizes positive temperature coefficient thermistor to limit impulse current, controls opening and turn-off of electronic switch pipe with the singlechip, and the circuit is more controllable, and the reliability is high, and the loss is low, has improved switching power supply's work efficiency, has also saved the space for high power density vehicle mounted power supply simultaneously.
Description
Technical Field
The utility model relates to a vehicle mounted power source field especially relates to a be applied to high-power vehicle mounted power source's pre-charge circuit.
Background
The DC-DC switching power supply system is usually connected with a vehicle-mounted high-voltage battery through a terminal, because of high power, a large number of capacitors can be discharged at the input end of the DC-DC switching power supply system, the voltage at two ends of the capacitors is zero at the beginning, and the vehicle-mounted high-voltage battery has high voltage, so that discharge and fire are generated at the moment when the DC-DC switching power supply is contacted with the high-voltage battery, a large impact current is generated at the moment, components behind the switching power supply are easily damaged, and the personal safety is not facilitated. In order to solve the problem, a pre-charging circuit is required to be added, the conventional pre-charging circuit is formed by connecting a PTC thermistor and a relay in parallel, the method is simple, but the size is large, the method is not suitable for a vehicle-mounted switching power supply system with high power density, and meanwhile, the relay is poor in control reliability, large in loss and low in efficiency.
In order to solve the problem, the utility model provides a new precharge circuit who is applicable to high-power vehicle power supply.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem provide a precharge circuit for high-power vehicle mounted power.
The utility model provides a technical scheme that above-mentioned technical problem adopted is: a pre-charging circuit for a high-power vehicle-mounted power supply comprises a vehicle-mounted high-voltage battery detection circuit, an input voltage detection circuit, a pre-charging circuit, a driving circuit, a first capacitor, a DC-DC power supply system power stage, one end of the vehicle-mounted high-voltage battery detection circuit is connected with the vehicle-mounted high-voltage battery, the other end of the vehicle-mounted high-voltage battery detection circuit is connected with a first port of the single chip microcomputer, one end of the input voltage detection circuit is connected with a first capacitor, the other end of the input voltage detection circuit is connected with a second port of the single chip microcomputer, one end of the driving circuit is connected with a third port of the single chip, the other port is connected with a pre-charging line, the first capacitor is connected with the power level of the DC-DC power supply, the vehicle-mounted high-voltage battery pre-charging circuit is characterized in that the pre-charging circuit is formed by connecting a pre-charging resistor and at least two controllable electronic switching tubes in parallel, one end of the pre-charging circuit is connected with the vehicle-mounted high-voltage battery, and the other end of the pre-charging circuit is connected with a first capacitor.
Preferably, the pre-charging line for the high-power vehicle-mounted power supply is characterized in that the pre-charging line comprises a pre-charging resistor, a first controllable electronic switching tube, a second controllable electronic switching tube, a diode, a second capacitor and a resistor, the pre-charging resistor is connected in parallel with the first controllable electronic switching tube and the second controllable electronic switching tube, one end of the pre-charging resistor is connected with the anode of the vehicle-mounted high-voltage battery, and the other end of the pre-charging resistor is connected with the anode of the first capacitor; the diode, the second capacitor and the resistor are connected in parallel, one end of the diode is connected with the anode of the first capacitor, and the other end of the diode is connected with the driving pins of the first controllable electronic switching tube and the second controllable electronic switching tube.
Preferably, the pre-charging circuit for the high-power vehicle-mounted power supply is characterized in that the pre-charging resistor is a positive temperature coefficient thermistor, the controllable electronic switching tube is formed by connecting at least two N-type MOSFETs with the same specification in parallel, the first capacitor is a general name of a capacitor at the input end of the DC-DC power supply system, and the positive electrode and the negative electrode of the first capacitor are respectively connected with the positive end and the negative end of the power stage of the DC-DC power supply system.
Preferably, the pre-charging circuit for the high-power vehicle-mounted power supply is characterized in that the vehicle-mounted high-voltage battery detection circuit, the input voltage detection circuit, the pre-charging circuit, the driving circuit, the single chip/MCU and the power stage of the DC-DC power supply system are all part of the DC-DC vehicle-mounted power supply system, and the pre-charging circuit is directly connected with the vehicle-mounted high-voltage battery or indirectly connected with the vehicle-mounted high-voltage battery through a fuse and an inductor.
The utility model provides a this kind of vehicle mounted power supply is circuit in advance utilizes positive temperature coefficient thermistor to restrict impulse current, controls opening and turn-off of electronic switch pipe with the singlechip, and the circuit is more controllable, and the reliability is high, and the loss is low, has improved switching power supply's work efficiency, has also saved the space for high power density vehicle mounted power supply simultaneously, makes the contribution for new energy automobile's development.
Drawings
Fig. 1 is a schematic diagram of a specific structure of a pre-charging circuit of a high-power vehicle-mounted power supply provided by the present invention.
Detailed Description
The circuit of the present invention is provided in the following embodiments with reference to the accompanying drawings to explain the technical solutions of the present invention in detail.
Fig. 1 below is a diagram of a pre-charging circuit of a high-power vehicle-mounted power supply, which includes a vehicle-mounted high-voltage battery, a vehicle-mounted high-voltage battery detection circuit 10, an input voltage detection circuit 20, a pre-charging circuit 30, and a driving circuit 40, wherein one end of the circuit 10 is connected to the anode of the vehicle-mounted high-voltage battery, the other end is connected to a first port VAUXS of a single chip microcomputer, one end of the circuit 20 is connected to the anode of a first capacitor C1, the other end is connected to a second port VINS of the single chip microcomputer, one end of the driving circuit 40 is connected to a third port BYP of the single chip microcomputer, the other port is connected to the pre-charging circuit 30, one end of the circuit 30 is directly or indirectly connected to the anode of the vehicle-mounted high-voltage battery through a fuse and an inductor, the other end is connected to the anode of C1, C1, the capacity value is large, the withstand voltage is high, the positive electrode and the negative electrode of the capacitor are respectively connected with the positive end and the negative end of the power electrode of the DC-DC power supply system, and the circuit 10, the circuit 20, the circuit 30, the circuit 40, the C1 and the power level of the DC-DC power supply system are all part of the DC-DC power supply system.
The circuit 30 comprises a positive temperature coefficient thermistor PTC, a first switch tube Q1, a second switch tube Q2, a diode CR1, a second capacitor C2, a resistor R1, Q1 and Q2 which are N-type MOS tubes with the same specification and are connected with the PTC resistor in parallel, and the CR1, the C2 and the R1 are connected in parallel and then bridged across two ends G, S of Q1 and Q2 to protect the grid electrodes of the MOS tubes, and the grid electrodes of Q1 and Q2 are connected with the cathode of the CR1 and the circuit 40.
The high-voltage battery has very high voltage, the input end of the DC-DC power supply module has a large number of capacitors, the voltages at two ends are zero at the beginning, when the vehicle-mounted power supply module is connected with the vehicle-mounted high-voltage battery, the high-voltage battery discharges through the PTC resistor, the resistance value of the PTC resistor increases along with the increase of the temperature, a good current limiting effect is achieved, the voltage difference between VAUX and VIN is gradually reduced in the process, when the single chip detects that the voltage difference between VAUX and VIN is reduced to 10V, the single chip sends out high level to transmit the high level to the gates of Q1 and Q2 through the driving circuit, the driving circuit simultaneously ensures that the gate voltages of Q1 and Q2 are higher than the source voltage, Q1 and Q2 are switched on, and the conduction impedances of Q1 and Q2 are very small, so that the loss.
Although specific implementations of the invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many variations or modifications may be made to these implementations without departing from the principles and spirit of the invention. The scope of protection of the invention is therefore defined by the appended claims.
Claims (4)
1. A pre-charging circuit for a high-power vehicle-mounted power supply comprises a vehicle-mounted high-voltage battery detection circuit, an input voltage detection circuit, a pre-charging circuit, a driving circuit, a first capacitor, a DC-DC power supply system power stage, one end of the vehicle-mounted high-voltage battery detection circuit is connected with the vehicle-mounted high-voltage battery, the other end of the vehicle-mounted high-voltage battery detection circuit is connected with a first port of the single chip microcomputer, one end of the input voltage detection circuit is connected with the first capacitor, the other end of the input voltage detection circuit is connected with a second port of the single chip microcomputer, one end of the driving circuit is connected with a third port of the single, the other port is connected with a pre-charging line, the first capacitor is connected with the power level of the DC-DC power supply, the vehicle-mounted high-voltage battery pre-charging circuit is characterized in that the pre-charging circuit is formed by connecting a pre-charging resistor and at least two controllable electronic switching tubes in parallel, one end of the pre-charging circuit is connected with the vehicle-mounted high-voltage battery, and the other end of the pre-charging circuit is connected with a first capacitor.
2. The pre-charging circuit for the high-power vehicle-mounted power supply according to claim 1, wherein the pre-charging circuit comprises a pre-charging resistor, a first controllable electronic switch tube, a second controllable electronic switch tube, a diode, a second capacitor and a resistor, the pre-charging resistor is connected with the first controllable electronic switch tube and the second controllable electronic switch tube in parallel, one end of the pre-charging resistor is connected with the anode of the vehicle-mounted high-voltage battery, and the other end of the pre-charging resistor is connected with the anode of the first capacitor; the diode, the second capacitor and the resistor are connected in parallel, one end of the diode is connected with the anode of the first capacitor, and the other end of the diode is connected with the driving pins of the first controllable electronic switching tube and the second controllable electronic switching tube.
3. The pre-charging circuit for the high-power vehicle-mounted power supply according to claim 1, wherein the pre-charging resistor is a positive temperature coefficient thermistor, the controllable electronic switching tube is formed by connecting at least two N-type MOSFETs of the same specification in parallel, the first capacitor is a general term of a capacitor at the input end of the DC-DC power supply system, and the positive and negative electrodes of the first capacitor are respectively connected with the positive and negative ends of the power stage of the DC-DC power supply system.
4. The pre-charging circuit for high-power vehicle-mounted power supply according to claim 1, wherein the vehicle-mounted high-voltage battery detection circuit, the input voltage detection circuit, the pre-charging circuit, the driving circuit, the single chip/MCU and the power stage of the DC-DC power supply system are all part of the DC-DC vehicle-mounted power supply system, and the pre-charging circuit is directly connected with the vehicle-mounted high-voltage battery or indirectly connected with the vehicle-mounted high-voltage battery through a fuse and an inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020197078.8U CN211296555U (en) | 2020-02-21 | 2020-02-21 | Pre-charging circuit for high-power vehicle-mounted power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020197078.8U CN211296555U (en) | 2020-02-21 | 2020-02-21 | Pre-charging circuit for high-power vehicle-mounted power supply |
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| CN211296555U true CN211296555U (en) | 2020-08-18 |
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| CN202020197078.8U Active CN211296555U (en) | 2020-02-21 | 2020-02-21 | Pre-charging circuit for high-power vehicle-mounted power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111162670A (en) * | 2020-02-21 | 2020-05-15 | 江苏兆能电子有限公司 | A pre-charging circuit for high-power vehicle power supply |
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- 2020-02-21 CN CN202020197078.8U patent/CN211296555U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111162670A (en) * | 2020-02-21 | 2020-05-15 | 江苏兆能电子有限公司 | A pre-charging circuit for high-power vehicle power supply |
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| GR01 | Patent grant | ||
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Address after: 212000 No.298, daijiamen Road, Zhenjiang high tech Zone, Zhenjiang City, Jiangsu Province Patentee after: JIANGSU ZHAONENG ELECTRONIC CO.,LTD. Address before: No.99, dingmaojing 15th Road, Zhenjiang New District, Zhenjiang City, Jiangsu Province, 212009 Patentee before: JIANGSU ZHAONENG ELECTRONIC CO.,LTD. |
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