CN221058038U - Simple protection circuit for LDO circuit output power supply of automobile air conditioner controller - Google Patents
Simple protection circuit for LDO circuit output power supply of automobile air conditioner controller Download PDFInfo
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- CN221058038U CN221058038U CN202322766532.3U CN202322766532U CN221058038U CN 221058038 U CN221058038 U CN 221058038U CN 202322766532 U CN202322766532 U CN 202322766532U CN 221058038 U CN221058038 U CN 221058038U
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- 239000003990 capacitor Substances 0.000 claims description 5
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- 230000008676 import Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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Abstract
The utility model discloses a simple protection circuit for an LDO circuit output power supply of an automobile air conditioner controller, which comprises: the LDO circuit is connected with the automobile power supply end and the output end of the automobile air conditioner controller and is used for reducing the automobile power supply voltage and outputting stable voltage to the output end of the automobile air conditioner controller; the triode control circuit is connected with the LDO circuit and the output end of the automobile air conditioner controller and is used for protecting the LDO circuit from being in a stable working state; the voltage comparison circuit is connected with the triode control circuit and the output end of the automobile air conditioner controller, is used for comparing the voltage of the output end of the automobile air conditioner controller and the voltage of the 12V power supply and outputting corresponding voltage to the triode control circuit, and has an overvoltage protection function; according to the utility model, under different working states, the LDO circuit can stably output, so that the automobile air conditioner controller can work normally, short-circuit protection can be provided for the output of the LDO circuit, meanwhile, the circuit cost is reduced, and enough current capacity is provided for supplying power to various sensors.
Description
Technical Field
The utility model relates to the technical field of automobile controllers, in particular to a simple protection circuit for an LDO circuit output power supply of an automobile air conditioner controller.
Background
With the rapid development of new energy electric vehicles, air conditioning systems of electric vehicles are more and more complex, from pure electric platforms, range-increasing and heat pump systems have been developed, corresponding logic functions are complex, the logic complexity is basically based on application of variables, the variables are usually acquisition variables, such as temperature sensors, pressure sensors, air quality sensors, CO2/CO sensors and the like, 5V power supplies are needed for the sensors, the power supply interfaces are connected with the whole vehicle, and experiments of the whole vehicle require that all output ports meet the functions of short-circuit protection on the ground and on a system power supply (12V/24V), and the functions of the electric vehicles can be realized only by using expensive foreign import chips at present, but the electric vehicles do not generally have the protection capability on power short circuits for most import LDOs and domestic LDOs.
Disclosure of utility model
The technical purpose is that: aiming at the defects of the prior art, the utility model discloses a simple protection circuit for an output power supply of an LDO circuit of an automobile air conditioner controller, which solves the problem that the LDO circuit lacks protection capability for the power supply, reduces the cost and provides enough current capability to supply power for various sensors.
The technical scheme is as follows: in order to achieve the technical purpose, the utility model adopts the following technical scheme:
A simple protection circuit for an output power supply of an LDO circuit of an automotive air conditioner controller, comprising:
the LDO circuit is connected with the automobile power supply end and the output end of the automobile air conditioner controller and is used for reducing the automobile power supply voltage and outputting stable voltage to the output end of the automobile air conditioner controller;
The triode control circuit is connected with the LDO circuit and the output end of the automobile air conditioner controller and is used for protecting the LDO circuit from being in a stable working state;
the voltage comparison circuit is connected with the triode control circuit and the output end of the automobile air conditioner controller, is used for comparing the voltage of the output end of the automobile air conditioner controller and the voltage of the 12V power supply and outputting corresponding voltage to the triode control circuit, and has an overvoltage protection function.
Preferably, the LDO circuit comprises an LDO chip, an input end of the LDO chip is connected with a power supply end of an automobile through a diode D2, and an output end of the LDO chip is connected with two grounding capacitors C3 and C4 in parallel and then connected to a triode control circuit.
Preferably, the triode control circuit comprises a first triode Q1, a second triode Q2 and a third triode Q3, wherein an emitter of the first triode Q1 is connected with an output end of the LDO chip, a collector of the first triode Q1 is connected with an output end of an automobile air conditioner controller, a resistor R1 and a patch diode D1 are further connected in parallel between the emitter and the collector of the first triode Q1, and a base of the first triode Q1 is connected with a collector of the second triode Q2 through the resistor R3; the emitter of the second triode Q2 is grounded, and the base electrode of the second triode Q2 is connected with the collector electrode of the third triode Q3; the emitter of the third triode Q3 is grounded, and the base electrode of the third triode Q3 is connected with the output end of the voltage comparison circuit through resistors R6 and R9.
Preferably, the voltage comparison circuit comprises a voltage comparator, the output end of the voltage comparator is connected with the base electrode of the third triode Q3 through resistors R6 and R9, the power supply negative end of the voltage comparator is connected with the emitter electrode of the third triode Q3, the power supply positive end of the voltage comparator is connected with 12V voltage, the positive input end of the voltage comparator is connected with the output end of the automobile air conditioner controller, and the negative input end of the voltage comparator is connected with a voltage division circuit.
Preferably, the voltage dividing circuit comprises two series resistors R8 and R10, one end of the voltage dividing circuit is connected with a 12V power supply, the other end of the voltage dividing circuit is grounded, and the negative input end of the voltage comparator is connected between the two resistors R8 and R10.
Preferably, the base electrode of the second triode is further connected with a voltage stabilizing circuit, the voltage stabilizing circuit comprises a voltage stabilizing diode D3 and resistors R4 and R5 connected with the voltage stabilizing diode in parallel, and the positive electrode of the voltage stabilizing diode D3 is grounded.
The beneficial effects are that: according to the utility model, the voltage of the output end of the automobile air conditioner controller is monitored by the voltage comparator of the voltage comparison circuit and compared with the 12V power supply voltage, and meanwhile, the LDO circuit can stably output under different working states by the working states of the cutting-off or conducting of each triode in the triode control circuit, so that the output of the LDO circuit is protected by short circuit, the circuit cost is reduced, enough current capacity is provided for supplying power to various sensors, and the automobile air conditioner controller can work normally.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic circuit diagram of a simple protection circuit for an output power supply of an LDO circuit of an automotive air conditioner controller according to the present utility model.
Detailed Description
The present utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the utility model are shown, but in which the utility model is not so limited.
As shown in fig. 1, a simple protection circuit for an output power supply of an LDO circuit of an automotive air conditioner controller includes:
the LDO circuit is connected with the automobile power supply end IG and the automobile air conditioner controller output end SW and is used for reducing the automobile power supply voltage and outputting stable voltage to the automobile air conditioner controller output end SW;
The triode control circuit is connected with the LDO circuit and the output end SW of the automobile air conditioner controller and is used for protecting the LDO circuit from being in a stable working state;
The voltage comparison circuit is connected with the triode control circuit and the output end SW of the automobile air conditioner controller, is used for comparing the voltage of the output end SW of the automobile air conditioner controller and the voltage of the 12V power supply and outputting corresponding voltage to the triode control circuit, and has an overvoltage protection function.
In a specific embodiment, the LDO circuit includes an LDO chip U1, the type of the LDO chip is ASM6050Q, the input end of the LDO chip U1, that is, the pin 1 of the LDO chip U1, is connected with the car power supply end IG through a diode D2, the type of the diode D2 is S1M, the anode of the diode D2 is connected with the car power supply end IG, the cathode of the diode D2 is connected with the input end of the LDO chip U1, that is, the pin 1 of the LDO chip U1, and the output end of the LDO chip U1, that is, the pin 3 of the LDO chip U1, is connected with two grounding capacitors C3 and C4 in parallel and then connected with the triode control circuit.
In a specific embodiment, the triode control circuit includes a first triode Q1, a second triode Q2 and a third triode Q3, the first triode Q1 is PNP, the second triode and the third triode are NPN, the first triode Q1 is 2SB1188BCQ, the third triode Q3 is MBT5551LT1, and the second triode Q2 is MBT5551LT1.
The emitter of the first triode Q1 is connected with the output end of the LDO circuit, the collector of the first triode Q1 is connected with the output end SW of the automobile air conditioner controller, a resistor R1 and a patch diode D1 are connected in parallel between the emitter and the collector of the first triode Q1, the model of the patch diode D1 is 1N4148W, and the base of the first triode Q1 is connected with the collector of the second triode Q2 through a resistor R3; the emitter of the second triode Q2 is grounded, and the base electrode of the second triode Q2 is connected with the collector electrode of the third triode Q3; the emitter of the third triode Q3 is grounded, and the base electrode of the third triode Q3 is connected with the output end of the voltage comparison circuit through resistors R6 and R9.
IN a specific embodiment, the voltage comparison circuit includes a voltage comparator IC1A, the voltage comparator IC1A employs a chip LM2904, an output terminal OUT of the voltage comparator IC1A, that is, a pin 1 of the voltage comparator IC1A is connected to a base of the third triode Q3 through resistors R6 and R9, a negative supply terminal V of the voltage comparator IC1A, that is, a pin 4 of the IC1A, is connected to an emitter of the third triode Q3, a positive supply terminal v+ of the voltage comparator IC1A, that is, a pin 8 of the IC1A, is connected to a 12V voltage, a positive input terminal in+ of the voltage comparator IC1A, that is, a pin 3 of the IC1A, is connected to an output terminal SW of the air conditioner controller of the vehicle, and a negative input terminal IN-of the voltage comparator IC1A and a pin 2 of the IC1A are connected to a voltage divider circuit.
In this embodiment, the voltage comparator IC1A operates in an open loop manner, and even if the open loop circuit is not connected to the feedback circuit, the output terminal OUT of the voltage comparator IC1A does not affect the output terminal, and the output terminal may not need to be added with a pull-up resistor.
The voltage dividing circuit comprises two series resistors R8 and R10, one end of the voltage dividing circuit is connected with a 12V power supply, the other end of the voltage dividing circuit is connected with the ground, and the negative input end IN-of the voltage comparator IC1A is connected between the two resistors R8 and R10.
The base of the second triode Q2 is also connected with a voltage stabilizing circuit, the voltage stabilizing circuit comprises a voltage stabilizing diode D3 and resistors R4 and R5 connected with the voltage stabilizing diode D3 in parallel, the model of the voltage stabilizing diode D3 is BZT52C5V1, and the positive electrode of the voltage stabilizing diode D3 is grounded.
Preferably, two grounding capacitors C3 and C4 are further connected in parallel between the LDO circuit and the collector of the first triode Q1, so that the redundant voltage can be absorbed when the output terminal SW of the automobile air conditioner controller is short-circuited.
The working principle of the circuit of the utility model is as follows: firstly, an automobile power supply end IG outputs 12V voltage to an LDO circuit, the LDO circuit outputs the 12V voltage to an automobile air conditioner controller output end SW after the 12V voltage is reduced to 5V, and a triode control circuit and a voltage comparison circuit are added in the middle to ensure the stability of the working state of the LDO circuit.
The specific working principle of the triode amplifying circuit and the voltage comparing circuit is as follows: when the voltage U IN+ at the positive input terminal in+ of the voltage comparator is greater than the voltage U IN- at the negative input terminal IN-of the voltage comparator, U IN+-UIN- is greater than 0, i.e., as the voltage at the point B IN fig. 1 is greater than the voltage at the point C, the voltage at the output terminal OUT of the voltage comparator IC1A approaches the voltage at the positive terminal v+ of the power supply, the third transistor Q3 is IN a conducting state, the voltage at the point a at the base of the second transistor Q2 IN fig. 1 is 0, the first transistor Q1 and the second transistor Q2 are both IN an off state, and the patch diode D1 is IN a reverse off state, so that the LDO circuit can be protected from being damaged due to high voltage; when the voltage U IN+ of the positive input end IN+ of the voltage comparator is smaller than the voltage U IN- of the negative input end IN-of the voltage comparator, and U IN+-UIN- is smaller than 0, the voltage smaller than 0 is close to a negative power supply or ground after being amplified by the voltage comparator for infinity, and is regarded as low level, at the moment, the base electrode of the third triode Q3 is close to the voltage at the negative power supply end V-, the triode Q3 is cut off, and when the automobile power supply end starts to supply power, the second triode Q2 is conducted through the patch diode D1 and the resistors R1, R2, R4 and R5, so that the first triode Q1 is also IN a conducting state, the circuit at the moment is IN a stable working state, the voltage at the point B is close to 5V, and the patch diode D1 is IN a closing state due to the fact that the voltages at the two ends are the same; when the point B is short-circuited, namely, when the output end SW of the automobile air conditioner controller is short-circuited, the voltage of the point A is 0, the second triode is in a cut-off state, the first triode Q1 is also in a cut-off state, the resistor R1 and the loop of the patch diode D1 are conducted, the resistor R1 plays a role in limiting current, and meanwhile, the two grounding capacitors C3 and C4 connected between the first triode Q1 of the LDO circuit can absorb voltage fluctuation generated by short circuit, so that the LDO circuit can stably output voltage close to 5V, is not influenced by the short circuit of the point B and can work normally.
The foregoing is only a preferred embodiment of the utility model, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the utility model.
Claims (6)
1. A simple protection circuit for an LDO circuit output power supply of an automobile air conditioner controller is characterized by comprising:
the LDO circuit is connected with the automobile power supply end and the output end of the automobile air conditioner controller and is used for reducing the automobile power supply voltage and outputting stable voltage to the output end of the automobile air conditioner controller;
The triode control circuit is connected with the LDO circuit and the output end of the automobile air conditioner controller and is used for protecting the LDO circuit from being in a stable working state;
the voltage comparison circuit is connected with the triode control circuit and the output end of the automobile air conditioner controller, is used for comparing the voltage of the output end of the automobile air conditioner controller and the voltage of the 12V power supply and outputting corresponding voltage to the triode control circuit, and has an overvoltage protection function.
2. The simple protection circuit for the output power supply of the LDO circuit of the automobile air conditioner controller according to claim 1, wherein the LDO circuit comprises an LDO chip, the input end of the LDO chip is connected with the automobile power supply end through a diode D2, and the output end of the LDO chip is connected with two grounding capacitors C3 and C4 in parallel and then connected with a triode control circuit.
3. The simple protection circuit for the LDO circuit output power supply of the automobile air conditioner controller according to claim 2, wherein the triode control circuit comprises a first triode Q1, a second triode Q2 and a third triode Q3, wherein an emitter of the first triode Q1 is connected with an output end of the LDO chip, a collector of the first triode Q1 is connected with the output end of the automobile air conditioner controller, a resistor R1 and a patch diode D1 are connected in parallel between the emitter and the collector of the first triode Q1, and a base of the first triode Q1 is connected with a collector of the second triode Q2 through the resistor R3; the emitter of the second triode Q2 is grounded, and the base electrode of the second triode Q2 is connected with the collector electrode of the third triode Q3; the emitter of the third triode Q3 is grounded, and the base electrode of the third triode Q3 is connected with the output end of the voltage comparison circuit through resistors R6 and R9.
4. A simple protection circuit for an output power supply of an LDO circuit of an automotive air conditioner controller according to claim 3, wherein the voltage comparison circuit comprises a voltage comparator, the output end of the voltage comparator is connected with the base electrode of the third triode Q3 through resistors R6 and R9, the power supply negative terminal of the voltage comparator is connected with the emitter electrode of the third triode Q3, the power supply positive terminal of the voltage comparator is connected with 12V voltage, the positive input end of the voltage comparator is connected with the output end of the automotive air conditioner controller, and the negative input end of the voltage comparator is connected with a voltage dividing circuit.
5. The simple protection circuit for the output power supply of the LDO circuit of the automobile air conditioner controller according to claim 4, wherein the voltage dividing circuit comprises two series resistors R8 and R10, one end of the voltage dividing circuit is connected with a 12V power supply, the other end of the voltage dividing circuit is grounded, and the negative input end of the voltage comparator is connected between the two resistors R8 and R10.
6. The simple protection circuit for an output power supply of an LDO circuit of an air conditioner controller of a vehicle according to claim 3, wherein the base of the second triode is further connected with a voltage stabilizing circuit, the voltage stabilizing circuit comprises a voltage stabilizing diode D3 and resistors R4 and R5 connected in parallel with the voltage stabilizing diode, and the positive electrode of the voltage stabilizing diode D3 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322766532.3U CN221058038U (en) | 2023-10-16 | 2023-10-16 | Simple protection circuit for LDO circuit output power supply of automobile air conditioner controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322766532.3U CN221058038U (en) | 2023-10-16 | 2023-10-16 | Simple protection circuit for LDO circuit output power supply of automobile air conditioner controller |
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| Publication Number | Publication Date |
|---|---|
| CN221058038U true CN221058038U (en) | 2024-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322766532.3U Active CN221058038U (en) | 2023-10-16 | 2023-10-16 | Simple protection circuit for LDO circuit output power supply of automobile air conditioner controller |
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| Country | Link |
|---|---|
| CN (1) | CN221058038U (en) |
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2023
- 2023-10-16 CN CN202322766532.3U patent/CN221058038U/en active Active
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