CN111196155A - Power-down delay circuit of vehicle-mounted DC-DC power supply - Google Patents
Power-down delay circuit of vehicle-mounted DC-DC power supply Download PDFInfo
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- CN111196155A CN111196155A CN202010106654.8A CN202010106654A CN111196155A CN 111196155 A CN111196155 A CN 111196155A CN 202010106654 A CN202010106654 A CN 202010106654A CN 111196155 A CN111196155 A CN 111196155A
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- power supply
- power
- vehicle
- resistor
- mcu
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/70—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by fuel cells
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention provides a vehicle-mounted DC-DC power supply power-off delay circuit which is characterized by comprising a power-off delay circuit, a KL15 detection circuit, an electronic switching tube, an auxiliary power supply module and an MCU, wherein an input port of the power-off delay circuit is connected with a first port of the MCU, an output port of the power-off delay circuit is connected with a driving pin of the electronic switching tube, the electronic switching tube is connected between the auxiliary power supply module and a fuel cell, the KL15 detection circuit is connected with a third port of the MCU, the auxiliary power supply module outputs voltage to a second port of the MCU, and a fourth port of the MCU is connected with a power board of a vehicle-mounted DC-DC power supply system. According to the power-off delay circuit of the vehicle-mounted power supply, the voltage of the KL15 is detected by the MCU, the switching tube is turned off after delay, the loss of a battery and a power supply system after the KL15 is powered off is reduced, the reliability is high, the circuit is simple, and the space is saved for the vehicle-mounted power supply with high power density.
Description
Technical Field
The invention relates to the field of vehicle-mounted power supplies, in particular to a power-down delay circuit of a vehicle-mounted DC-DC power supply.
Background
At present, electric vehicles are accepted by more and more people, people pay more attention to the safety and characteristic problems of the electric vehicles while accepting the electric vehicles, and a DC-DC switching power supply system applied to a vehicle-mounted system is accepting strict examination. Usually, an auxiliary power supply module of the DC-DC switching power supply system is connected to the fuel cell directly or through a filter circuit, and when the vehicle is turned off or the KL15 is powered down, the voltage on the fuel cell is applied to the auxiliary power supply module, so that the auxiliary power supply module generates standby loss, and the electric energy of the fuel cell is gradually consumed.
In order to solve the problems, the invention provides a power-off delay circuit of a vehicle-mounted DC-DC power supply, wherein the voltage of KL15 is detected by an MCU, and a switching tube is turned off after delay, so that the loss of a battery and a power supply system after the KL15 is powered off is reduced, the reliability is high, and the circuit is simple.
Disclosure of Invention
The invention aims to provide a power-off delay circuit of a vehicle-mounted DC-DC power supply.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a power-off delay circuit of on-vehicle DC-DC power supply, its characterized in that includes a power-off delay circuit, a KL15 detection circuitry, an electronic switch tube, an auxiliary power supply module, an MCU, the input port of power-off delay circuit connects a first port of MCU, and the drive foot of electronic switch tube is connected to the output port, and the electronic switch tube is connected between auxiliary power supply module and fuel cell, and KL15 detection circuitry connects a third port of MCU, and auxiliary power supply module output voltage gives a second port of MCU, and a fourth port of MCU connects the power board of the on-vehicle power supply system of DC-DC.
Preferably, the vehicle-mounted DC-DC power supply power-down delay line is characterized in that the electronic switching tube is a PMOS tube, a drain of the electronic switching tube is connected to the auxiliary power supply module, a source of the electronic switching tube is connected to the fuel cell, and a gate of the electronic switching tube is connected to the power-down delay line.
Preferably, the power-down delay line of the vehicle-mounted DC-DC power supply includes a first resistor, a second resistor, a first diode, and a first NPN transistor, wherein an anode of the first diode is connected to the first port of the MCU, a cathode of the first diode is connected to a base of the first NPN transistor through the second resistor, an emitter of the first NPN transistor is grounded, and a collector of the first NPN transistor is connected to a gate of the electronic switching tube through the first resistor.
Preferably, the KL15 detection circuit includes a second diode, a third diode, a second NPN transistor, a third resistor, a fourth resistor, and a fifth resistor, wherein a collector of the second NPN transistor is connected to the third port of the MCU and one end of the fifth resistor, an emitter of the second NPN transistor is grounded, a base of the second NPN transistor is connected to a cathode of the second diode through the fourth resistor, anodes of the second diode and the third diode are connected to the KL15 signal, a cathode of the third diode is connected to a base of the first NPN transistor through the third resistor, and another end of the fifth resistor is connected to a stable voltage source VDDS.
Preferably, the vehicle-mounted DC-DC power supply power-off delay line is characterized in that the auxiliary power supply module is an independent DC-DC switching power supply module, and the PIN is inserted directly into the system board of the DC-DC vehicle-mounted power supply module, and is used for supplying power after high voltage is converted into low voltage.
Preferably, the vehicle-mounted DC-DC power supply power-down delay line is characterized in that the stable voltage source VDDS is a stable low voltage obtained by voltage reduction of an internal circuit of the DC-DC vehicle-mounted power supply and is used for supplying power to a plurality of chips of the internal circuit of the power supply system.
According to the power-off delay circuit of the vehicle-mounted power supply, the voltage of the KL15 is detected by the MCU, the switching tube is turned off after delay, the loss of a battery and a power supply system after the KL15 is powered off is reduced, the reliability is high, the circuit is simple, and the space is saved for the vehicle-mounted power supply with high power density.
Drawings
Fig. 1 is a schematic diagram of a power-down delay circuit structure of a vehicle-mounted DC-DC power supply provided by the invention.
Detailed Description
The following provides a detailed description of the circuit of the present invention with reference to the drawings to explain the technical solutions of the present invention in detail.
Fig. 1 below shows a power-down delay line of a vehicle-mounted DC-DC power supply, which includes a power-down delay line 10, a KL15 detection line 20, an electronic switch Q1, an auxiliary power supply module, and an MCU, wherein an input port of the power-down delay line 10 is connected to a first port 1 of the MCU, an output port is connected to a driving pin of Q1, Q1 is connected between the auxiliary power supply module and a fuel cell, the KL15 detection line is connected to a third port 3 of the MCU, the auxiliary power supply module outputs voltage to a second port 2 of the MCU, and a fourth port 4 of the MCU is connected to a power board of the DC-DC vehicle-mounted power supply system.
The electronic switching tube Q1 is a PMOS tube, the drain of which is connected to the auxiliary power supply module, the source of which is connected to the fuel cell, and the gate of which is connected to the power-down delay line.
The circuit 10 comprises a first resistor R1, a second resistor R2, a first diode CR1 and a first NPN type triode Q2, wherein the anode of the CR1 is connected with the port 1 of the MCU, the cathode of the CR1 is connected with the base of the Q2 through R2, the emitter of the Q2 is grounded, and the collector of the CR1 is connected with the gate of the Q1 through R1.
The KL15 detection circuit comprises a second diode CR2, a third diode CR3, a second NPN triode Q3, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, wherein the collector of the Q3 is connected with the port 3 of the MCU and one end of the R5, the emitter is grounded, the base is connected with the cathode of the CR2 through R4, the anodes of the CR2 and the CR3 are connected with KL15 signals together, the cathode of the CR3 is connected with the base of the Q2 through R3, and the other end of the R5 is connected with a stable voltage source VDDS.
The auxiliary power supply module is an independent DC-DC switching power supply module, and the PIN is inserted in a straight mode, is installed on a system board of the DC-DC vehicle-mounted power supply module, and is used for supplying power after high voltage is converted into low voltage.
The stabilized voltage source VDDS is a stabilized low voltage obtained by the step-down of the internal circuit of the DC-DC vehicle power supply and is used for supplying power to a plurality of chips of the internal circuit of the power supply system.
When the electric automobile is ignited and started, signals of KL15 pass through bases of CR3 and R3 to Q2, Q2 is turned on, the grid voltage of Q1 is pulled down, Q1 is a P-type MOS (metal oxide semiconductor) tube, Q1 is turned on, the voltage on the fuel cell passes through Q1 to an auxiliary power supply module, the auxiliary power supply module starts to work to supply power to an MCU (microprogrammed control unit), the MCU outputs signals to a power board of a DC-DC vehicle-mounted power supply system, and meanwhile, OFF _ DELAY signals are also output, Q2 and Q1 are kept on, and the DC-DC vehicle-mounted power supply system works; when the electric automobile is powered OFF by KL15, the MCU judges through KL15_ SEN detected, and then turns OFF related circuits such as a power board and the like, and the OFF _ DELAY signal is removed after the countdown of 50 seconds, so that Q2 is turned OFF, Q1 is turned OFF, the passage between the fuel cell and the auxiliary power supply module is disconnected, and the electricity of the fuel cell cannot be lost on the auxiliary power supply module after the electric automobile is powered OFF.
Although specific implementations of the invention have been described above, it will be appreciated by those skilled in the art that these are merely illustrative 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 the invention is therefore defined by the appended claims.
Claims (6)
1. The utility model provides a power-off delay circuit of on-vehicle DC-DC power supply, its characterized in that includes a power-off delay circuit, a KL15 detection circuitry, an electronic switch tube, an auxiliary power supply module, an MCU, the input port of power-off delay circuit connects a first port of MCU, and the drive foot of electronic switch tube is connected to the output port, and the electronic switch tube is connected between auxiliary power supply module and fuel cell, and KL15 detection circuitry connects a third port of MCU, and auxiliary power supply module output voltage gives a second port of MCU, and a fourth port of MCU connects on-vehicle DC-DC electrical power generating system's power board.
2. The vehicle-mounted DC-DC power supply down delay circuit of claim 1, wherein the electronic switch tube is a PMOS tube, the drain electrode of the electronic switch tube is connected with the auxiliary power supply module, the source electrode of the electronic switch tube is connected with the fuel cell, and the grid electrode of the electronic switch tube is connected with the down delay circuit.
3. The power down delay line of claim 1, wherein the power down delay line comprises a first resistor, a second resistor, a first diode, and a first NPN transistor, the first diode having an anode connected to the first port of the MCU, a cathode connected to the base of the first NPN transistor through the second resistor, an emitter of the transistor being grounded, and a collector connected to the gate of the electronic switch through the first resistor.
4. The vehicle-mounted DC-DC power supply down delay circuit according to claim 1, wherein the KL15 detection circuit comprises a second diode, a third diode, a second NPN transistor, a third resistor, a fourth resistor and a fifth resistor, wherein a collector of the second NPN transistor is connected to the third port of the MCU and one end of the fifth resistor, an emitter of the second NPN transistor is grounded, a base of the second diode is connected to a cathode of the second diode through the fourth resistor, the second diode and an anode of the third diode are connected to the KL15 signal, a cathode of the third diode is connected to a base of the first NPN transistor through the third resistor, and the other end of the fifth resistor is connected to a stable voltage source VDDS.
5. The vehicle-mounted DC-DC power supply power-off delay line of claim 1, wherein the auxiliary power supply module is a separate DC-DC switching power supply module, and the PIN is inserted in-line and is installed on a system board of the DC-DC vehicle-mounted power supply module for supplying power after high voltage is converted into low voltage.
6. The vehicle-mounted DC-DC power supply down delay line of claim 1, wherein the stabilized voltage source VDDS is a stabilized low voltage obtained by the step-down of the internal circuit of the DC-DC vehicle-mounted power supply for supplying power to the plurality of chips of the internal circuit of the power system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010106654.8A CN111196155A (en) | 2020-02-21 | 2020-02-21 | Power-down delay circuit of vehicle-mounted DC-DC power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010106654.8A CN111196155A (en) | 2020-02-21 | 2020-02-21 | Power-down delay circuit of vehicle-mounted DC-DC power supply |
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| Publication Number | Publication Date |
|---|---|
| CN111196155A true CN111196155A (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010106654.8A Pending CN111196155A (en) | 2020-02-21 | 2020-02-21 | Power-down delay circuit of vehicle-mounted DC-DC power supply |
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| CN (1) | CN111196155A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485725A (en) * | 2020-10-21 | 2021-03-12 | 惠州市德赛西威汽车电子股份有限公司 | Device and method for detecting power line state of vehicle-mounted entertainment and instrument system |
| CN112498112A (en) * | 2020-12-04 | 2021-03-16 | 南理工泰兴智能制造研究院有限公司 | New energy automobile power supply system |
-
2020
- 2020-02-21 CN CN202010106654.8A patent/CN111196155A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485725A (en) * | 2020-10-21 | 2021-03-12 | 惠州市德赛西威汽车电子股份有限公司 | Device and method for detecting power line state of vehicle-mounted entertainment and instrument system |
| CN112485725B (en) * | 2020-10-21 | 2022-10-28 | 惠州市德赛西威汽车电子股份有限公司 | Device and method for detecting power line state of vehicle-mounted entertainment and instrument system |
| CN112498112A (en) * | 2020-12-04 | 2021-03-16 | 南理工泰兴智能制造研究院有限公司 | New energy automobile power supply system |
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Address after: 212000 No.298, daijiamen Road, Zhenjiang high tech Zone, Zhenjiang City, Jiangsu Province Applicant after: JIANGSU ZHAONENG ELECTRONIC CO.,LTD. Address before: No.99, dingmaojing 15th Road, Zhenjiang New District, Zhenjiang City, Jiangsu Province, 212009 Applicant before: JIANGSU ZHAONENG ELECTRONIC CO.,LTD. |