CN109032045B - Vehicle-mounted high-side switch - Google Patents
Vehicle-mounted high-side switch Download PDFInfo
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- CN109032045B CN109032045B CN201811142532.3A CN201811142532A CN109032045B CN 109032045 B CN109032045 B CN 109032045B CN 201811142532 A CN201811142532 A CN 201811142532A CN 109032045 B CN109032045 B CN 109032045B
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- 238000001514 detection method Methods 0.000 claims abstract description 27
- 238000005485 electric heating Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000003750 conditioning effect Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Electronic Switches (AREA)
Abstract
A vehicle-mounted high-side switch comprises a controller, an MOS main switch tube driving circuit, an MOS main switch tube, a detection circuit, a logic circuit and an MOS tube follow current circuit. The input end of the MOS main switch tube is used for being connected with an external power supply. The input end of the detection circuit is electrically connected with the output end of the MOS main switch tube. The first output end of the controller is electrically connected with the input end of the MOS main switching tube driving circuit, and the output end of the MOS main switching tube is used for being connected with an electric heating element of the vehicle-mounted preheater. The MOS tube freewheel circuit comprises a plurality of freewheel MOS tubes which are connected in parallel. The first conduction ends of the plurality of follow current MOS tubes are connected to the output ends of the MOS main switch tubes, and the second conduction ends are grounded. The input end of the logic circuit is electrically connected with the second output end of the controller, and the output ends of the logic circuit are respectively electrically connected with the control ends of the plurality of follow current MOS tubes. The invention can burn the MOS main switch tube when the MOS main switch tube fails, thereby protecting the vehicle-mounted preheater from being burned.
Description
Technical Field
The invention relates to the automotive electronics technology, in particular to a high-side switch for controlling the power supply of a vehicle-mounted preheater.
Background
Fig. 1 shows a schematic block diagram of a conventional vehicle-mounted high-side switch. The existing vehicle-mounted high-side switch 100 mainly comprises a power circuit 91, a controller 92, a MOS main switch tube driving circuit 93 and a MOS main switch tube 94, and is mainly used for controlling the work of the vehicle-mounted preheater. The vehicle-mounted storage battery 7 is electrically connected with an input end of the power circuit 91 and an input end of the MOS main switch tube 94 respectively, an output end of the power circuit 91 is electrically connected with a power input end of the controller 92, an output end of the controller 92 is electrically connected with an input end of the MOS main switch tube driving circuit 93, an output end of the MOS main switch tube driving circuit 93 is connected with a control end of the MOS main switch tube 94, and an output end of the MOS main switch tube 94 is electrically connected with the electric heating element 8 of the vehicle-mounted preheater.
Typically, the aforementioned power supply circuit 91 includes an LDO circuit (Low Dropout Regulator, low dropout linear regulator), the controller 92 is composed of an MCU, the MOS main switch tube 94 is composed of an NMOS tube, the vehicle-mounted storage battery 7 is a 24V battery, and the electric heating element 8 of the vehicle-mounted preheater is a resistance wire.
When the automobile starts, the vehicle-mounted storage battery 7 supplies power to the power circuit 91 and the MOS main switch tube 94 respectively, and the power circuit 91 supplies power to the controller 92. The controller 92 is used to control the on or off of the MOS main switching transistor 94. When the MOS main switch tube 94 is turned on, the current flowing out of the vehicle-mounted storage battery 7 flows into the electric heating element 8 of the vehicle-mounted preheater through the MOS main switch tube 94, and the vehicle-mounted preheater starts to heat the automobile engine; when the MOS main switch tube 94 is turned off, no current flows through the electric heating element 8 of the vehicle-mounted preheater, and the heating of the automobile engine is stopped. Because the MOS main switch tube 94 has failure risk, once the MOS main switch tube 94 fails, the vehicle-mounted preheater is continuously heated, so that the vehicle-mounted preheater can be burnt out, other equipment on the vehicle can be burnt out, and the potential safety hazard is large.
In order to detect whether the MOS main switch tube 94 is failed, as shown in fig. 1, a detection circuit 95 for detecting whether the MOS main switch tube 94 has an output current is provided in some vehicle-mounted high-side switches in the market at present, and the controller 92 can determine whether the MOS main switch tube 94 is failed according to the detection result of the detection circuit 95, but cannot automatically prevent the heating element of the vehicle-mounted preheater from continuously heating, so that the potential safety hazard caused by the failure of the MOS main switch tube 94 is not completely removed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the vehicle-mounted high-side switch, which can burn the MOS main switch tube of the vehicle-mounted high-side switch when the MOS main switch tube fails, so that the power supply of the power supply to the vehicle-mounted preheater is cut off.
The vehicle-mounted high-side switch comprises a controller, an MOS main switch tube driving circuit, an MOS main switch tube and a detection circuit; the input end of the MOS main switch tube is used for connecting an external power supply; the input end of the detection circuit is electrically connected with the output end of the MOS main switching tube, and the detection circuit is used for detecting whether the MOS main switching tube has output current or not; the signal input end of the controller is electrically connected with the output end of the detection circuit, the first output end of the controller is electrically connected with the input end of the MOS main switching tube driving circuit, and the controller can determine whether the MOS main switching tube fails according to the detection result of the detection circuit; the output end of the MOS main switch tube driving circuit is connected with the control end of the MOS main switch tube, and the output end of the MOS main switch tube is used for being connected with an electric heating element of the vehicle-mounted preheater; the vehicle-mounted high-side switch further comprises a protection circuit; the protection circuit comprises a logic circuit and an MOS tube freewheel circuit; the MOS tube freewheel circuit comprises a plurality of freewheel MOS tubes which are connected in parallel, wherein first conduction ends of the freewheel MOS tubes are connected to the output end of the MOS main switch tube, and second conduction ends of the freewheel MOS tubes are grounded; the input end of the logic circuit is electrically connected with the second output end of the controller, and the output end of the logic circuit is electrically connected with the control ends of the plurality of freewheel MOS tubes respectively; the controller is used for outputting a first level signal to the logic circuit when the MOS main switch tube fails, and the logic circuit is used for driving the plurality of freewheel MOS tubes to be conducted when the first level signal is received.
The invention has at least the following advantages:
1. according to the vehicle-mounted high-side switch provided by the embodiment of the invention, under the conditions that the MOS main switch tube is invalid and the vehicle-mounted preheater is continuously heated, a plurality of follow current switch tubes of the protection circuit are conducted, so that the current flowing through the MOS main switch tube is increased, the invalid MOS main switch tube is forced to blow before the follow current switch tube, the power supply of the power supply to the vehicle-mounted preheater is cut off, the vehicle-mounted preheater and other equipment on the vehicle are prevented from being burnt due to the failure of the MOS main switch tube, and the electricity safety of the equipment on the vehicle is ensured;
2. the protection circuit of the vehicle-mounted high-side switch has the advantages of high response speed, low manufacturing cost and easiness in implementation.
Drawings
Fig. 1 shows a schematic block diagram of a conventional vehicle-mounted high-side switch.
Fig. 2 shows a schematic circuit diagram of a vehicle-mounted high-side switch according to an embodiment of the invention.
Fig. 3 shows a schematic diagram of an operation sequence of a MOS main switch transistor according to an embodiment of the invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples.
Please refer to fig. 2. The vehicle-mounted high-side switch according to an embodiment of the invention comprises a power supply circuit 1, a controller 2, a MOS main switch tube driving circuit 3, a MOS main switch tube 4, a detection circuit 5 and a protection circuit 6.
The input end of the power supply circuit 1 and the input end of the MOS main switch tube 4 are used for being connected with an external power supply, and the output end of the power supply circuit 1 is electrically connected with the power supply input end of the controller 2 so as to supply power to the controller 2.
In the present embodiment, the external power source is the in-vehicle battery 7, and the output voltage of the in-vehicle battery 7 is 24V. The power supply circuit 1 includes an LDO circuit that can convert the output voltage of the in-vehicle battery 7 into the operating voltage of the controller 2. The controller 2 adopts MCU.
The input end of the detection circuit 5 is electrically connected with the output end of the MOS main switch tube 4, and the detection circuit 5 is used for detecting whether the MOS main switch tube 4 has output current or not. In the embodiment shown in fig. 2, the detection circuit 5 includes a current sampling resistor Rs and a signal conditioning circuit 51, the current sampling resistor Rs is connected in series between the output end of the MOS main switch tube 4 and the electric heating element 8 of the vehicle-mounted preheater, the input end of the signal conditioning circuit 51 is connected to two ends of the current sampling resistor Rs, and the output end of the signal conditioning circuit 51 is electrically connected to the input end of the controller 2. The signal conditioning circuit 51 is configured to amplify the acquired signal and transmit the amplified signal to the controller 2.
The controller 2 is communicatively connected to the engine ECU 10. The signal input end of the controller 2 is electrically connected with the output end of the detection circuit 5, the first output end of the controller 2 is electrically connected with the input end of the MOS main switching tube driving circuit 3, and the controller 2 can determine whether the MOS main switching tube 4 fails according to the detection result of the detection circuit 5. The output end of the MOS main switch tube driving circuit 3 is connected with the control end of the MOS main switch tube 4, and the output end of the MOS main switch tube 4 is used for being connected with an electric heating element 8 of the vehicle-mounted preheater. In this embodiment, the MOS main switch tube 4 is composed of an NMOS tube, and the drain, source and gate of the NMOS tube respectively form an input end, an output end and a control end of the MOS main switch tube 4.
The protection circuit 6 includes a logic circuit 61 and a MOS transistor freewheel circuit 62. The MOS transistor freewheel circuit 62 includes a plurality of freewheel MOS transistors connected in parallel with each other, and first conduction ends of the freewheel MOS transistors are all connected to the output end of the MOS main switch transistor 4, and second conduction ends of the freewheel MOS transistors are all grounded. The plurality of freewheel MOS pipes are connected in parallel, the current capacity of the freewheel MOS pipes is larger than that of the disabled MOS main switch pipe 4, the input end of the logic circuit 61 is electrically connected with the second output end of the controller 2, and the output end of the logic circuit 61 is electrically connected with the control ends of the freewheel MOS pipes respectively.
In this embodiment, the MOS transistor freewheel circuit 62 includes a first freewheel MOS transistor Q5, a second freewheel MOS transistor Q6, a third freewheel MOS transistor Q7, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9. One end of a seventh resistor R7 is electrically connected to the control end of the first freewheel MOS transistor Q5 and the output end of the logic circuit 61, one end of an eighth resistor R8 is electrically connected to the control end of the second freewheel MOS transistor Q6, one end of a ninth resistor R9 is electrically connected to the control end of the third freewheel MOS transistor Q7, and the other end of the seventh resistor R7, the other end of the eighth resistor R8, and the other end of the ninth resistor R9 are electrically connected to each other.
Optionally, the plurality of freewheel MOS tubes are NMOS tubes, and drain electrodes, source electrodes and grid electrodes of the NMOS tubes respectively form a first conduction end, a second conduction end and a control end of the freewheel MOS tubes.
The controller 2 is configured to output a first level signal to the logic circuit 61 when the MOS main switch tube 4 fails, and to output a second level signal by default when the MOS main switch tube 4 does not fail, where the logic circuit 61 is configured to drive the plurality of freewheel MOS tubes to be turned on when the first level signal is received, and not to drive the plurality of freewheel MOS tubes of the MOS tube freewheel circuit 62 to be turned on when the second level signal is received.
In the present embodiment, the logic circuit 61 includes a voltage dividing circuit 611, an output control circuit 612, and a push-pull amplifying circuit 613.
An input terminal of the voltage dividing circuit 611 is electrically connected to the second output terminal of the controller 2, and is used for dividing the signal output by the controller 2. An input terminal of the output control circuit 612 is electrically connected to an output terminal of the voltage dividing circuit 611, and is configured to output a first control signal to the push-pull amplifying circuit 613 when receiving the first level signal divided by the voltage dividing circuit 611. The input end of the push-pull amplifying circuit 613 is electrically connected to the output end of the output control circuit 612, and is used for driving the plurality of freewheel MOS transistors of the MOS transistor freewheel circuit 62 to be turned on when receiving the first control signal.
Specifically, the voltage dividing circuit 611 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is electrically connected with the second output end of the controller 2, the second end of the first resistor R1 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is grounded. The output control circuit 612 includes a logic circuit power supply Vd, a first NPN transistor Q1, a second NPN transistor Q2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The logic circuit power supply Vd is electrically connected with one end of a third resistor R3 and one end of a fourth resistor R4 respectively, the other end of the third resistor R3 is electrically connected with the collector of the first NPN triode Q1 and the base of the second NPN triode Q2 respectively, and the other end of the fourth resistor R4 is electrically connected with the collector of the second NPN triode Q2. The base of the first NPN triode Q1 is electrically connected to the output end of the voltage divider 611 (i.e., the common junction between the other end of the first resistor R1 and one end of the second resistor R2), and the emitter of the first NPN triode Q1 and the emitter of the second NPN triode Q2 are both grounded. One end of the fifth resistor R5 is electrically connected to the other end of the fourth resistor R4 and the collector of the second NPN triode Q2, respectively. The push-pull amplifying circuit 613 includes a third NPN transistor Q3, a first PNP transistor Q4, and a sixth resistor R6. The base electrode of the third NPN triode Q3 is respectively and electrically connected with the other end of the fifth resistor R5 and the base electrode of the first PNP triode Q4, and the collector electrode of the third NPN triode Q3 is electrically connected with the logic circuit power supply Vd. The emitter of the third NPN triode Q3 is electrically connected to the collector of the first PNP triode Q4 and one end of the sixth resistor R6, respectively, the emitter of the first PNP triode Q4 is grounded, and the other end of the sixth resistor R6 constitutes the output end of the logic circuit 61.
The operation of the vehicle-mounted high-side switch according to an embodiment of the present invention is approximately as follows.
When the controller 2 receives the heating signal of the vehicle-mounted preheater sent by the engine ECU10, a PWM signal is output to the MOS main switching tube driving circuit 3, and the MOS main switching tube driving circuit 3 starts to work after receiving the PWM signal, so that the MOS main switching tube 4 is conducted. When the detection circuit 5 detects that the MOS main switch tube 4 has output current, the vehicle-mounted high-side switch is in a normal on working state, and the protection circuit 6 does not work.
When the controller 2 receives the vehicle-mounted preheater stop heating signal from the engine ECU10, the PWM signal is not output to the MOS main switching tube driving circuit 3, and the MOS main switching tube driving circuit 3 does not operate. If the MOS main switch tube 4 is not in failure, the MOS main switch tube 4 is in an off state, the controller 2 detects that the MOS main switch tube 4 has no output current through the detection circuit 5, the vehicle-mounted high-side switch is in a normal off state, and the protection circuit 6 does not work. When the controller 2 receives the vehicle-mounted preheater stop heating signal sent by the engine ECU10, if the controller 2 detects that the MOS main switching tube 4 continuously has an output current through the detection circuit 5, it is determined that the MOS main switching tube 4 is in a failure state. At this time, the controller 2 sends a first level signal to the logic circuit 61, and the logic circuit 61 starts to operate, driving the three freewheel MOS transistors Q5, Q6 and Q7 to conduct, thereby increasing the current flowing through the MOS main switch transistor 4. Because the current capacity of the MOS tubes after being connected in parallel is far greater than the current capacity of a failed MOS tube, after three follow current MOS tubes Q5, Q6 and Q7 are conducted, the failed MOS main switch tube 4 can be blown out in a short time, so that the power supply of the vehicle-mounted storage battery 7 to the electric heating element 8 of the vehicle-mounted preheater is cut off, the vehicle-mounted preheater and other equipment on the vehicle are prevented from being blown out due to the failure of the MOS main switch tube, and the electricity safety of the equipment is ensured.
In this embodiment, the heating signal and the first level signal of the on-vehicle preheater are both high level signals, and the heating stop signal and the second level signal of the on-vehicle preheater are low level signals. When the controller 2 outputs a high level signal to the logic circuit 61, the first NPN transistor Q1 is turned on, the second NPN transistor Q2 is turned off, and the output control circuit 612 outputs a high level first control signal to the push-pull amplifying circuit 613, so that the third NPN transistor Q3 is turned on and the first PNP transistor Q4 is turned off, thereby driving the three freewheeling MOS transistors Q5, Q6 and Q7 to be turned on. When the controller 2 outputs a low level signal to the logic circuit 61, the first NPN triode Q1 is not turned on, the second NPN triode Q2 is turned on, and the output control circuit 612 outputs a low level second control signal to the push-pull amplifying circuit 613, so that the third NPN triode Q3 is not turned on and the first PNP triode Q4 is turned on, thereby disabling the MOS transistor freewheel circuit 62. The operation timing diagram of the MOS main switch 4 is shown in fig. 3. The engine ECU10 sends out a high-level signal, and outputs a PWM high-level signal to the MOS main switch tube driving circuit 3 after the MCU as the controller 2 initializes 100mS, the MOS main switch tube driving circuit 3 works, and the MOS main switch tube 4 has output current; when the engine ECU10 outputs a low level to the MCU, the MCU detects that the output signal of the engine ECU changes from a high level to a low level, and synchronizes with the level of the engine ECU to a low level, and then the in-vehicle high-side switch does not output. When the engine ECU10 outputs a low-level signal, the PWM signal output by the MCU as the controller 2 is also low level, and the vehicle-mounted high-side switch continues to have output current, at this time, the MOS main switch tube 4 is in a failure state, and the MCU sends a high-level signal to the MOS main switch tube driving circuit 3 to drive the plurality of freewheel MOS tubes to be turned on, and blow the failed MOS main switch tube 4, so as to achieve the purpose of actively cutting off the power supply.
In this application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. A vehicle-mounted high-side switch comprises a controller, an MOS main switch tube driving circuit, an MOS main switch tube and a detection circuit; the input end of the MOS main switch tube is used for connecting an external power supply; the input end of the detection circuit is electrically connected with the output end of the MOS main switch tube, and the detection circuit is used for detecting whether the MOS main switch tube has output current or not; the signal input end of the controller is electrically connected with the output end of the detection circuit, the first output end of the controller is electrically connected with the input end of the MOS main switching tube driving circuit, and the controller can determine whether the MOS main switching tube fails or not according to the detection result of the detection circuit; the output end of the MOS main switch tube driving circuit is connected with the control end of the MOS main switch tube, and the output end of the MOS main switch tube is used for being connected with an electric heating element of the vehicle-mounted preheater; the vehicle-mounted high-side switch is characterized by further comprising a protection circuit; the protection circuit comprises a logic circuit and an MOS tube freewheel circuit;
the MOS tube freewheel circuit comprises a plurality of freewheel MOS tubes which are connected in parallel, wherein first conduction ends of the freewheel MOS tubes are connected to the output end of the MOS main switch tube, and second conduction ends of the freewheel MOS tubes are grounded;
the input end of the logic circuit is electrically connected with the second output end of the controller, and the output ends of the logic circuit are respectively and electrically connected with the control ends of the plurality of follow current MOS tubes;
the controller is used for outputting a first level signal to the logic circuit when the MOS main switch tube fails, and the logic circuit is used for driving the plurality of freewheel MOS tubes to be conducted when the first level signal is received.
2. The vehicle-mounted high-side switch according to claim 1, wherein the logic circuit comprises a voltage dividing circuit, an output control circuit, and a push-pull amplifying circuit;
the input end of the voltage dividing circuit is electrically connected with the second output end of the controller and is used for dividing the signal output by the controller;
the input end of the output control circuit is electrically connected with the output end of the voltage dividing circuit and is used for outputting a first control signal to the push-pull amplifying circuit when the first level signal divided by the voltage dividing circuit is received;
the input end of the push-pull amplifying circuit is electrically connected with the output end of the output control circuit and is used for driving the plurality of freewheel MOS tubes to be conducted when the first control signal is received.
3. The vehicle-mounted high-side switch according to claim 2, wherein the voltage dividing circuit comprises a first resistor and a second resistor; one end of the first resistor is electrically connected with the second output end of the controller, the second end of the first resistor is connected with one end of the second resistor, and the other end of the second resistor is grounded.
4. The vehicle-mounted high-side switch according to claim 2, wherein the output control circuit comprises a logic circuit power supply, a first NPN triode, a second NPN triode, a third resistor, a fourth resistor and a fifth resistor; the logic circuit power supply is respectively and electrically connected with one end of the third resistor and one end of the fourth resistor, the other end of the third resistor is respectively and electrically connected with the collector electrode of the first NPN triode and the base electrode of the second NPN triode, and the other end of the fourth resistor is electrically connected with the collector electrode of the second NPN triode; the base electrode of the first NPN triode is electrically connected with the output end of the voltage dividing circuit, and the emitter electrode of the first NPN triode and the emitter electrode of the second NPN triode are grounded; one end of the fifth resistor is respectively and electrically connected with the other end of the fourth resistor and the collector electrode of the second NPN triode.
5. The vehicle-mounted high-side switch according to claim 4, wherein the push-pull amplifying circuit comprises a third NPN triode, a first PNP triode and a sixth resistor; the base electrode of the third NPN triode is respectively and electrically connected with the other end of the fifth resistor and the base electrode of the first PNP triode, the collector electrode of the third NPN triode is electrically connected with the logic circuit power supply, and the emitter electrode of the third NPN triode is respectively and electrically connected with the collector electrode of the first PNP triode and one end of the sixth resistor; the emitter of the first PNP triode is grounded, and the other end of the sixth resistor forms the output end of the logic circuit.
6. The vehicle-mounted high-side switch according to claim 1 or 2, wherein the freewheel MOS transistor is an NMOS transistor, and a drain, a source and a gate of the NMOS transistor respectively form a first conducting end, a second conducting end and a control end of the freewheel MOS transistor.
7. The vehicle-mounted high-side switch according to claim 6, wherein the MOS transistor freewheel circuit comprises a first freewheel MOS transistor, a second freewheel MOS transistor, a third freewheel MOS transistor, a seventh resistor, an eighth resistor and a ninth resistor;
one end of the seventh resistor is electrically connected with the control end of the first follow current MOS tube and the output end of the logic circuit respectively, one end of the eighth resistor is electrically connected with the control end of the second follow current MOS tube, one end of the ninth resistor is electrically connected with the control end of the third follow current MOS tube, and the other end of the seventh resistor, the other end of the eighth resistor and the other end of the ninth resistor are electrically connected with each other.
8. The vehicle-mounted high-side switch according to claim 1, wherein the MOS main switch tube is an NMOS tube, and a drain, a source and a gate of the NMOS tube respectively form an input end, an output end and a control end of the MOS main switch tube.
9. The vehicle-mounted high-side switch according to claim 2, wherein the first level signal and the first control signal are both high level signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811142532.3A CN109032045B (en) | 2018-09-28 | 2018-09-28 | Vehicle-mounted high-side switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811142532.3A CN109032045B (en) | 2018-09-28 | 2018-09-28 | Vehicle-mounted high-side switch |
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| CN109032045A CN109032045A (en) | 2018-12-18 |
| CN109032045B true CN109032045B (en) | 2024-03-26 |
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| CN201811142532.3A Active CN109032045B (en) | 2018-09-28 | 2018-09-28 | Vehicle-mounted high-side switch |
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| CN111290317B (en) * | 2020-02-24 | 2023-03-21 | 重庆长安新能源汽车科技有限公司 | CAN control module, CAN emergency shutdown channel circuit and vehicle |
| CN113644621A (en) * | 2020-05-11 | 2021-11-12 | 上汽通用汽车有限公司 | Automobile circuit protection device, system and method |
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| CN109032045A (en) | 2018-12-18 |
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