CN212323705U - Input power protection circuit of automobile controller - Google Patents
Input power protection circuit of automobile controller Download PDFInfo
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- CN212323705U CN212323705U CN201921731866.4U CN201921731866U CN212323705U CN 212323705 U CN212323705 U CN 212323705U CN 201921731866 U CN201921731866 U CN 201921731866U CN 212323705 U CN212323705 U CN 212323705U
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Abstract
The utility model discloses an input power protection circuit of an automobile controller, which connects the input end of an overvoltage and overcurrent detection module with the power input end; the output end of the overvoltage and overcurrent detection module is respectively connected with the input end of the MOS tube control module; the MOS control module is arranged between the source electrode and the grid electrode of the switch MOS in parallel; the source electrode of the switch MOS is connected with the overcurrent detection module; the drain electrode of the switch MOS is used as a power output end to be connected with an external circuit; the over-current detection module and the MOS control module are respectively connected with the ground. The input power supply protection circuit of the automobile controller provided by the invention realizes the protection of the protection power supply through the conduction and the cut-off of the field effect tube, solves the problems that the power supply can not work due to overcurrent of the controller, the power supply can not be recovered after the controller recovers to be normal and the problems that the controller works unstably and the safety is reduced after the power supply of the controller is subjected to current-limiting protection.
Description
Technical Field
The utility model relates to an electronic equipment technical field, especially a car controller input power protection circuit.
Background
At present, overcurrent protection of an input power supply of an automobile controller mainly adopts a fuse protector protection scheme, a resistor current-limiting protection scheme or a common protection scheme of a resistor and the fuse protector for overcurrent protection, and each protection circuit has the following defects:
fuse protection disadvantages: the circuit can not be recovered, and even if the controller recovers to be normal after the fuse is fused due to the short circuit of the controller, the fuse can not work continuously, and the fuse needs to be replaced again, so that inconvenience and cost waste are caused.
Resistance current limiting protection shortcoming: series connection current-limiting resistor on the power cord, for reaching the protection effect, series connection resistance and power are great, receive series connection resistance power restriction, and the power can't provide higher power, and current-limiting resistor produces the voltage drop at the controller during operation, makes the operating voltage of controller reduce, leads to controller work unstability easily, and current-limiting resistor constantly generates heat at work simultaneously, if the heat dissipation is not in time, takes place thermal runaway easily, leads to the risk increase of catching fire.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a protection circuit for an input power of a vehicle controller, which adopts the on-state and the off-state of a field effect transistor to realize the protection function of the input power.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the input power supply protection circuit of the automobile controller comprises an overvoltage detection module, an overcurrent detection module, an MOS (metal oxide semiconductor) tube control module and a switch MOS Q4;
the input ends of the overvoltage detection module and the overcurrent detection module are connected with the input end of a power supply;
the output ends of the overvoltage detection module and the overcurrent detection module are respectively connected with the input end of the MOS tube control module;
the MOS pipe control module is arranged between the source and the grid of the switch MOS Q4 in parallel;
the source electrode of the switch MOS Q4 is connected with the overcurrent detection module;
the drain electrode of the switch MOS Q4 is used as a power supply output end to be connected with an external circuit;
the over-current detection module and the MOS control module are respectively connected with the ground.
Further, the overvoltage detection module comprises a zener diode D1; the overcurrent detection module comprises a PNP triode Q1, a resistor R1 and a resistor R2;
the cathode of the voltage-stabilizing diode D1 is connected with the emitter of a PNP triode Q1;
the anode of the voltage-stabilizing diode D1 is connected with the collector of a PNP triode Q1;
a resistor R1 is arranged between the emitter and the base of the PNP triode Q1,
the collector of the PNP triode Q1 is connected with the ground through a resistor R2;
and the collector and the base of the PNP triode Q1 are respectively connected with the MOS tube control module.
Further, the overvoltage detection module further comprises a capacitor C1; the capacitor C1 is connected between the anode of the zener diode D1 and ground.
Further, the MOS tube control module comprises a PNP triode Q2, an NPN triode Q3, a resistor R3, a resistor R4, a resistor R5 and a resistor R6;
the base electrode of the NPN triode Q3 is connected with the collector electrode of the PNP triode Q1 through a resistor R3;
the emitter of the NPN transistor Q3 is connected to ground,
the collector of the NPN transistor Q3 is connected to the base of a PNP transistor Q2 through a resistor R5,
the base of the PNP transistor Q2 is connected to the base of the PNP transistor Q1 through a resistor R4,
the emitter of the PNP triode Q2 is connected with the source of the P-channel MOS tube Q4,
the collector of the PNP triode Q2 and the gate of the P-channel MOS transistor Q4 are grounded through R6.
Further, the switching MOS Q4 is a P-channel MOS transistor Q4; the drain electrode of the P-channel MOS tube Q4 is the output of the protection circuit.
Further, the overvoltage detection module comprises a zener diode D1; the over-current detection module comprises a P-channel MOS tube Q1, a resistor R1 and a resistor R2;
the cathode of the voltage-stabilizing diode D1 is connected with the source electrode of a P-channel MOS tube Q1;
the anode of the voltage-stabilizing diode D1 is connected with the drain of a P-channel MOS tube Q1;
a resistor R1 is arranged between the source and the gate of the P-channel MOS transistor Q1,
the drain electrode of the P-channel MOS tube Q1 is connected with the ground through a resistor R2;
and the drain and the gate of the P-channel MOS tube Q1 are respectively connected with the MOS tube control module.
Further, the MOS tube control module comprises a P-channel MOS tube Q2, an N-channel MOS tube Q3, a resistor R3, a resistor R4, a resistor R5 and a resistor R6;
the grid electrode of the N-channel MOS tube Q3 is connected with the drain electrode of the P-channel MOS tube Q1 through a resistor R3;
the source of the N-channel MOS transistor Q3 is connected to ground,
the drain of the N-channel MOS transistor Q3 is connected to the gate of the P-channel MOS transistor Q2 through a resistor R5,
the gate of the P-channel MOS transistor Q2 is connected to the gate of the P-channel MOS transistor Q1 through a resistor R4,
the source electrode of the P-channel MOS tube Q2 is connected with the source electrode of the P-channel MOS tube Q4,
the drain of the P-channel MOS transistor Q2 and the gate of the P-channel MOS transistor Q4 are grounded through R6.
The beneficial effects of the utility model reside in that:
the input power protection circuit of the automobile controller provided by the invention realizes the protection of the protection power through the low on-resistance of the field effect tube, and solves the problems that the power cannot work due to overcurrent of the controller, the power cannot be recovered after the controller recovers to normal and the controller works unstably and has low safety after the power of the controller is subjected to current-limiting protection.
The circuit can realize the real-time protection of overcurrent and overvoltage of the power supply circuit and can restore, the resistance value of the R1 resistor is very small in the working process of the circuit, the resistance value is generally a few tenths of ohms, the heat generation is small, the trouble of replacing a fuse for restoring the circuit to work is avoided, and the cost and the time are saved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
In order to make the purpose, technical scheme and beneficial effect of the utility model clearer, the utility model provides a following figure explains:
fig. 1 is a schematic block diagram of an input power protection circuit of an automobile controller.
Fig. 2 is a triode diagram of an input power protection circuit of an automobile controller.
Fig. 3 is a diagram of an input power protection circuit MOS of the automotive controller.
In the figure, 1 denotes an overvoltage detection module, 2 denotes an overcurrent detection module, 3 denotes a MOS transistor control module, and 4 denotes a switch MOS Q4.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
Example 1
As shown in fig. 1, the input power protection circuit of the automobile controller provided in this embodiment includes an overvoltage detection module, an overcurrent detection module, a MOS transistor control module, and a switch MOS Q4;
the input ends of the overvoltage detection module and the overcurrent detection module are connected with the input end of a power supply;
the output ends of the overvoltage detection module and the overcurrent detection module are respectively connected with the input end of the MOS tube control module;
the MOS pipe control module is arranged between the source and the grid of the switch MOS Q4 in parallel;
the source electrode of the switch MOS Q4 is connected with the overcurrent detection module;
the drain electrode of the switch MOS Q4 is used as a power supply output end to be connected with an external circuit;
the over-current detection module and the MOS control module are respectively connected with the ground;
the overvoltage detection module is used for detecting a voltage signal at the input end of the power supply, and triggering the control action of the MOS control module on the switch MOS Q4 when the voltage at the input end of the power supply exceeds a preset voltage value;
the overcurrent detection module is used for detecting a current signal at the input end of the power supply, and triggering the control action of the MOS control module on the switch MOS Q4 when the current at the input end of the power supply exceeds a preset current value;
the MOS tube control module is used for controlling the voltage of the source electrode and the grid electrode of the switch MOS Q4 so as to be suitable for controlling the on-off state of the switch MOS Q4.
As shown in fig. 2, the overvoltage detection module includes a zener diode D1, a capacitor C1; the overcurrent detection module comprises a PNP triode Q1, a resistor R1 and a resistor R2; the MOS tube control module comprises a PNP triode Q2, an NPN triode Q3, a resistor R3, a resistor R4, a resistor R5 and a resistor R6; the switch MOS Q4 is a P-channel MOS tube Q4;
the cathode of the voltage-stabilizing diode D1 is connected with the emitter of a PNP triode Q1;
the anode of the voltage-stabilizing diode D1 is connected with the collector of a PNP triode Q1;
a resistor R1 is arranged between the emitter and the base of the PNP triode Q1,
the collector of the PNP transistor Q1 is connected to ground through a resistor R2,
the base electrode of the NPN triode Q3 is connected with the collector electrode of the PNP triode Q1 through a resistor R3;
the emitter of the NPN transistor Q3 is connected to ground,
the collector of the NPN transistor Q3 is connected to the base of a PNP transistor Q2 through a resistor R5,
the base of the PNP transistor Q2 is connected to the base of the PNP transistor Q1 through a resistor R4,
the emitter of the PNP triode Q2 is connected with the source of the P-channel MOS tube Q4,
the collector of the PNP triode Q2 and the gate of the P-channel MOS transistor Q4 are grounded through R6.
The drain electrode of the P-channel MOS tube Q4 is the output of the protection circuit.
The working principle of the input power protection circuit of the automobile controller is as follows:
when the output end of the power supply is not overcurrent, the voltage drop of the resistor R1 is smaller than the conduction voltage between the emitter and the base of the PNP triode Q1, so that conduction current cannot be formed between the emitter and the base, the PNP triode Q1 is cut off, the base of the NPN triode Q3 is connected to the ground through the resistor R2 and the resistor R3, the NPN triode Q3 is cut off, the base of the PNP triode Q2 is connected to the power supply through the resistor R4, the PNP triode Q2 is cut off, the grid of the P-channel MOS transistor Q4 is connected to the ground through the resistor R6, the P-channel MOS transistor Q4.
When overcurrent occurs at the output end of the power supply, the voltage drop of the resistor R1 is greater than the conducting voltage between the emitter and the base of the PNP triode Q1, so that conducting current is formed between the emitter and the base, the PNP triode Q1 is conducted, the base of the NPN triode Q3 is connected to the power supply through the R3 and the PNP triode Q1, the NPN triode Q3 is conducted, the resistor R4 and the resistor R5 are connected to the ground through the NPN triode Q3, divided voltage is formed at the base of the PNP triode Q2, so that conducting current is formed between the emitter and the base of the PNP triode Q2, the PNP triode Q2 is conducted, the gate of the P-channel MOS tube Q4 is connected to the power supply through the PNP triode Q2, the voltage between the gate and the source of the P-channel MOS tube Q4 is 0V, the P-channel MOS tube Q4 is cut off, when the P-channel MOS tube Q4 is cut off, the voltage drop of the resistor R46, when the output overcurrent recovers to be normal, the PNP triode Q1 is cut off, the NPN triode Q3 is cut off, the PNP triode Q2 is cut off, the P-channel MOS tube Q4 is switched on, and the power supply outputs normally.
The capacitor C1 is an energy storage discharge capacitor, and functions to stabilize the base voltage of the NPN transistor Q3, so that the on-time of the NPN transistor Q3 is longer than the off-time during overcurrent protection, and the power output voltage approaches to a stable 0V during short-circuit protection.
The overvoltage protection function principle of the circuit is as follows: when the input voltage of the power supply exceeds the protection voltage value of the voltage regulator tube D1, the voltage regulator tube D1 is broken down and conducted, the base electrode of the NPN triode Q3 is connected to the power supply through the resistor R3 and the voltage regulator tube D1, the NPN triode Q3 is conducted, the resistor R4 and the resistor R5 are connected between the power supply and the ground through the NPN triode Q3, the voltage division is formed at the base electrode of the PNP triode Q2, the PNP triode Q2 is conducted, the voltage of the grid electrode and the source electrode of the P-channel MOS tube Q4 is 0V, the P-channel MOS tube Q4 is cut off, and.
When the overvoltage of the power input is recovered to be normal, the voltage stabilizing diode is cut off, the base electrode of the NPN triode Q3 is connected to the ground through the resistor R3 and the resistor R2, the NPN triode Q3 is cut off, the PNP triode Q2 is cut off, the grid electrode of the P-channel MOS tube Q4 is connected to the ground through the R6, the P-channel MOS tube Q4 is conducted, and the power is normally output.
Example 2
As shown in fig. 3, the PNP transistor Q1 and the PNP transistor Q2 in the circuit can be replaced by P-channel MOS transistors, the NPN transistor Q3 can be replaced by N-channel MOS transistors, and the cut-off and conduction relationships of the MOS transistors when the circuit is subjected to overcurrent, overvoltage, and normal recovery are the same as those of the transistor circuit.
The overvoltage detection module of the present embodiment includes a zener diode D1; the over-current detection module comprises a P-channel MOS tube Q1, a resistor R1 and a resistor R2; the MOS tube control module comprises a P-channel MOS tube Q2, an N-channel MOS tube Q3, a resistor R3, a resistor R4, a resistor R5 and a resistor R6;
the cathode of the voltage-stabilizing diode D1 is connected with the source electrode of a P-channel MOS tube Q1;
the anode of the voltage-stabilizing diode D1 is connected with the drain of a P-channel MOS tube Q1;
a resistor R1 is arranged between the source and the gate of the P-channel MOS transistor Q1,
the drain electrode of the P-channel MOS tube Q1 is connected with the ground through a resistor R2;
and the drain and the gate of the P-channel MOS tube Q1 are respectively connected with the MOS tube control module.
The grid electrode of the N-channel MOS tube Q3 is connected with the drain electrode of the P-channel MOS tube Q1 through a resistor R3;
the source of the N-channel MOS transistor Q3 is connected to ground,
the drain of the N-channel MOS transistor Q3 is connected to the gate of the P-channel MOS transistor Q2 through a resistor R5,
the gate of the P-channel MOS transistor Q2 is connected to the gate of the P-channel MOS transistor Q1 through a resistor R4,
the source electrode of the P-channel MOS tube Q2 is connected with the source electrode of the P-channel MOS tube Q4,
the drain of the P-channel MOS transistor Q2 and the gate of the P-channel MOS transistor Q4 are grounded through R6.
The P-channel MOS transistor Q4 can also be replaced by a PNP triode, which can also achieve a protection function, but the PNP triode has a large on-resistance, which is likely to cause heating, so that the effect of selecting a low on-resistance MOS transistor is better.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (5)
1. The utility model provides an automobile controller input power protection circuit which characterized in that: comprises that
The overvoltage detection module, the overcurrent detection module, the MOS tube control module and the switch MOS Q4;
the input ends of the overvoltage detection module and the overcurrent detection module are connected with the input end of a power supply;
the output ends of the overvoltage detection module and the overcurrent detection module are respectively connected with the input end of the MOS tube control module;
the MOS pipe control module is arranged between the source and the grid of the switch MOS Q4 in parallel;
the source electrode of the switch MOS Q4 is connected with the overcurrent detection module;
the drain electrode of the switch MOS Q4 is used as a power supply output end to be connected with an external circuit;
the over-current detection module and the MOS control module are respectively connected with the ground;
the overvoltage detection module comprises a zener diode D1; the overcurrent detection module comprises a PNP triode Q1, a resistor R1 and a resistor R2;
the cathode of the voltage-stabilizing diode D1 is connected with the emitter of a PNP triode Q1;
the anode of the voltage-stabilizing diode D1 is connected with the collector of a PNP triode Q1;
a resistor R1 is arranged between the emitter and the base of the PNP triode Q1,
the collector of the PNP triode Q1 is connected with the ground through a resistor R2;
the collector and the base of the PNP triode Q1 are respectively connected with the MOS control module;
the MOS tube control module comprises a PNP triode Q2, an NPN triode Q3, a resistor R3, a resistor R4, a resistor R5 and a resistor R6;
the base electrode of the NPN triode Q3 is connected with the collector electrode of the PNP triode Q1 through a resistor R3;
the emitter of the NPN transistor Q3 is connected to ground,
the collector of the NPN transistor Q3 is connected to the base of a PNP transistor Q2 through a resistor R5,
the base of the PNP transistor Q2 is connected to the base of the PNP transistor Q1 through a resistor R4,
the emitter of the PNP triode Q2 is connected with the source of the P-channel MOS tube Q4,
the collector of the PNP triode Q2 and the gate of the P-channel MOS transistor Q4 are grounded through R6.
2. The protection circuit of claim 1, wherein: the overvoltage detection module further comprises a capacitor C1; the capacitor C1 is connected between the anode of the zener diode D1 and ground.
3. The protection circuit of claim 1, wherein: the switch MOS Q4 is a P-channel MOS tube Q4; the drain electrode of the P-channel MOS tube Q4 is the output of the protection circuit.
4. The protection circuit of claim 1, wherein: the overvoltage detection module comprises a zener diode D1; the over-current detection module comprises a P-channel MOS tube Q1, a resistor R1 and a resistor R2;
the cathode of the voltage-stabilizing diode D1 is connected with the source electrode of a P-channel MOS tube Q1;
the anode of the voltage-stabilizing diode D1 is connected with the drain of a P-channel MOS tube Q1;
a resistor R1 is arranged between the source and the gate of the P-channel MOS transistor Q1,
the drain electrode of the P-channel MOS tube Q1 is connected with the ground through a resistor R2;
and the drain and the gate of the P-channel MOS tube Q1 are respectively connected with the MOS tube control module.
5. The protection circuit of claim 1, wherein: the MOS tube control module comprises a P-channel MOS tube Q2, an N-channel MOS tube Q3, a resistor R3, a resistor R4, a resistor R5 and a resistor R6;
the grid electrode of the N-channel MOS tube Q3 is connected with the drain electrode of the P-channel MOS tube Q1 through a resistor R3;
the source of the N-channel MOS transistor Q3 is connected to ground,
the drain of the N-channel MOS transistor Q3 is connected to the gate of the P-channel MOS transistor Q2 through a resistor R5,
the gate of the P-channel MOS transistor Q2 is connected to the gate of the P-channel MOS transistor Q1 through a resistor R4,
the source electrode of the P-channel MOS tube Q2 is connected with the source electrode of the P-channel MOS tube Q4,
the drain of the P-channel MOS transistor Q2 and the gate of the P-channel MOS transistor Q4 are grounded through R6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921731866.4U CN212323705U (en) | 2019-10-16 | 2019-10-16 | Input power protection circuit of automobile controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921731866.4U CN212323705U (en) | 2019-10-16 | 2019-10-16 | Input power protection circuit of automobile controller |
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| CN212323705U true CN212323705U (en) | 2021-01-08 |
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| CN201921731866.4U Active CN212323705U (en) | 2019-10-16 | 2019-10-16 | Input power protection circuit of automobile controller |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993960A (en) * | 2021-03-05 | 2021-06-18 | 上海有个机器人有限公司 | Power supply bleeder circuit and electronic equipment |
| CN113114197A (en) * | 2021-04-30 | 2021-07-13 | 石家庄宇飞电子有限公司 | Analog inductance circuit |
| CN113162011A (en) * | 2021-04-23 | 2021-07-23 | 长城电源技术有限公司 | Overvoltage protection circuit and power supply circuit |
| CN113437726A (en) * | 2021-06-29 | 2021-09-24 | 重庆长安新能源汽车科技有限公司 | Reverse-connection-preventing self-recovery overcurrent protection circuit |
| CN115140008A (en) * | 2022-09-06 | 2022-10-04 | 万向钱潮股份公司 | Vehicle braking system control device |
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2019
- 2019-10-16 CN CN201921731866.4U patent/CN212323705U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112993960A (en) * | 2021-03-05 | 2021-06-18 | 上海有个机器人有限公司 | Power supply bleeder circuit and electronic equipment |
| CN112993960B (en) * | 2021-03-05 | 2024-08-16 | 上海有个机器人有限公司 | Power supply bleeder circuit and electronic equipment |
| CN113162011A (en) * | 2021-04-23 | 2021-07-23 | 长城电源技术有限公司 | Overvoltage protection circuit and power supply circuit |
| CN113114197A (en) * | 2021-04-30 | 2021-07-13 | 石家庄宇飞电子有限公司 | Analog inductance circuit |
| CN113437726A (en) * | 2021-06-29 | 2021-09-24 | 重庆长安新能源汽车科技有限公司 | Reverse-connection-preventing self-recovery overcurrent protection circuit |
| CN115140008A (en) * | 2022-09-06 | 2022-10-04 | 万向钱潮股份公司 | Vehicle braking system control device |
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