CN216057579U - Heavy current control circuit based on rain-proof short circuit interference - Google Patents
Heavy current control circuit based on rain-proof short circuit interference Download PDFInfo
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- CN216057579U CN216057579U CN202121752488.5U CN202121752488U CN216057579U CN 216057579 U CN216057579 U CN 216057579U CN 202121752488 U CN202121752488 U CN 202121752488U CN 216057579 U CN216057579 U CN 216057579U
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Abstract
The utility model discloses a large-current control circuit based on rainwater short circuit interference prevention, and relates to the technical field of electronic circuits. Comprises a high level input end connected with the positive pole of the driver/bulb and providing a high level input; the reference end of the reference voltage comparator is externally connected with the input signal end, and the anode of the reference voltage comparator is grounded; the voltage division unit comprises a first input end, a second input end and an output end, wherein the first input end is connected with the high-level input end, and the second input end is connected with the cathode of the reference voltage comparator; the output end is connected with the control end of the controllable switch unit; and the control end of the controllable switch unit is connected with the output end of the voltage dividing unit, the first end of the controllable switch unit is grounded, and the second end of the controllable switch unit is connected with the negative electrode of the driver/bulb. The utility model can identify the short circuit interference signal caused by rainwater, and avoid the phenomenon of driving on the vehicle or lamp bulb misoperation caused by rainwater.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a large-current control circuit based on rainwater short circuit interference prevention.
Background
With the development of technology, more and more circuits are integrated on a vehicle, such as driving circuits of lamps, such as headlamps, turn lamps and tail lamps. When the vehicle is exposed in rainy days, the switch is likely to contact rainwater to cause rainwater short circuit, and micro current is generated, so that the circuit works under the interference of the rainwater short circuit. For example, the driving circuit of the car light is interfered by the short circuit of rainwater, and then the car light is turned on, so that energy is wasted, the phenomenon of disorder of the indicating lamp is possibly caused, the risk of causing traffic accidents is caused, and the traffic disorder is caused. Therefore, how to develop a control circuit capable of avoiding the short-circuit interference of rainwater is one of the problems to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a heavy current control circuit based on rainwater short circuit interference prevention, which can identify a short circuit interference signal caused by rainwater and avoid the phenomenon of driving on a vehicle or lamp misoperation caused by rainwater.
In order to achieve the purpose, the utility model provides the following technical scheme:
a large current control circuit based on rain-proof short circuit interference comprises
The high-level input end is connected with the positive electrode of the driving/bulb and provides a high-level input;
the reference end of the reference voltage comparator is externally connected with the input signal end, and the anode of the reference voltage comparator is grounded;
the voltage division unit comprises a first input end, a second input end and an output end, wherein the first input end is connected with the high-level input end, and the second input end is connected with the cathode of the reference voltage comparator; the output end is connected with the control end of the controllable switch unit;
and the control end of the controllable switch unit is connected with the output end of the voltage dividing unit, the first end of the controllable switch unit is grounded, and the second end of the controllable switch unit is connected with the negative electrode of the driver/bulb.
Compared with the prior art, the utility model has the beneficial effects that: the utility model identifies whether the input signal end inputs a short-circuit signal caused by normal low current or rainwater short circuit through the reference voltage comparator, controls the opening of the controllable switch unit through the voltage dividing unit under the condition of inputting the normal low current, drives/bulbs to form a complete loop, and closes the controllable switch unit and drives/bulbs to open and stop the negative pole when the short-circuit signal caused by rainwater short circuit is input; therefore, the interference to the circuit in the vehicle caused by the short circuit of the rainwater is avoided.
Further, the voltage divider further comprises an anti-reverse connection unit, wherein the anti-reverse connection unit is arranged between the voltage divider unit and the high-level input end and comprises a diode VD 1.
Furthermore, the device also comprises an anti-interference unit, wherein the anti-interference unit is connected with the input signal end and comprises a plurality of capacitors connected in parallel.
Further, the overvoltage protection circuit further comprises an overvoltage protection unit, wherein the overvoltage protection unit is arranged between the reference voltage comparator and the input signal end and comprises a diode VD2 connected in an opposite mode.
Further, the voltage division unit comprises a first resistor R2, a second resistor R3 and a third resistor R5; a first end of the first resistor R2 is used as a first input end of the voltage division unit and is connected with a high-level input; the second end of the first resistor R2 and the first end of the second resistor R3 are connected to be used as a second input end of the voltage division unit and connected with the cathode of the reference voltage comparator; the second end of the second resistor R3 is connected to the first end of the third resistor R5 as the output end of the voltage dividing unit, and is connected to the control end of the controllable switch unit.
Further, the controllable switch unit comprises a MOS transistor Q2.
Further, the protection circuit also comprises a controllable switch protection unit, wherein the controllable switch protection unit comprises a capacitor C4, and the capacitor C4 is connected between the source and the gate of the MOS transistor Q2 in parallel.
Further, the reference voltage comparator has a model number ME 432.
Drawings
Fig. 1 is a schematic block diagram of a circuit according to an embodiment of the present invention.
Fig. 2 is a specific circuit diagram of an embodiment of the utility model.
In the figure: 10. a high level input terminal; 11. an anti-reverse connection unit; 12. an input signal terminal; 13. an overvoltage protection unit; 14. an anti-interference unit; 15. a reference voltage comparator; 16. a voltage dividing unit; 17. a driver or light bulb; 18. a ground terminal; 19. a controllable switch protection unit; 20. a controllable switching unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, the present embodiment provides a large current control circuit based on rain short circuit interference, including:
a high level input terminal 10, connected to the positive terminal of the driver/bulb, providing a high level input VCC _ VIN +;
a ground terminal 18 providing ground GND;
an input signal terminal 12 for providing an input signal;
the reference voltage comparator 15 is a reference voltage comparator Q1 with model number ME432, a reference terminal R of which is externally connected to the input signal terminal 12, an anode a of which is grounded, and a cathode K of which is connected to the voltage dividing unit 16. The reference terminal of the reference voltage comparator 15 is also connected to the high level input terminal 10 through a resistor R4 and a resistor R1.
The voltage division unit 16 comprises a first input end, a second input end and an output end, wherein the first input end is connected with the high-level input end 10, and the second input end is connected with the cathode of the reference voltage comparator 15; the output terminal is connected to the control terminal of the controllable switching unit 20. Specifically, referring to fig. 2, the voltage dividing unit 16 includes a first resistor R2, a second resistor R3, and a third resistor R5; a first end of the first resistor R2 is used as a first input end of the voltage dividing unit 16 and is connected with a high level input; a second end of the first resistor R2 and a first end of the second resistor R3 are connected as a second input end of the voltage dividing unit 16, and are connected with a cathode of the reference voltage comparator 15; a second terminal of the second resistor R3 is connected to a first terminal of the third resistor R5 as an output terminal of the voltage divider unit 16, and is connected to a control terminal of the controllable switch unit 20.
The controllable switch unit 20 comprises a MOS transistor Q2, a control terminal (gate) of the controllable switch unit 20 is connected to the output terminal of the voltage dividing unit 16, a first terminal (source) is grounded, and a second terminal (drain) is connected to the negative electrode of the driver/bulb 17.
When a normal low-current negative signal is input, the voltage is about 0.7V and is less than the reference voltage 1.25V of the reference voltage comparator 15, the reference voltage comparator 15 does not work, and the circuit is broken between the anode A and the cathode K. At point B and point C in the voltage dividing unit 16, the voltage is divided according to the normal operating voltage, and point C outputs a high level, so that the rear end MOS transistor Q2 is turned on, the whole rear end loop is turned on, and the driver or the bulb starts to operate. When rainwater and other negative signals are in short circuit, the signal impedance is increased, the signal is similar to the situation that the negative signal is connected with the resistance input of more than 1K, the voltage input to the reference end of the reference voltage comparator 15 is higher than the reference voltage by 1.25V, the reference voltage comparator 15 works, the cathode K is communicated with the anode A, the voltages of the point B and the point C in the voltage division unit 16 are directly pulled down and output in a state opposite to the high level of a normal signal, namely, the low level is output, the MOS tube Q2 is cut off, the rear end cannot form a complete loop, and the driving or the lamp bulb does not work.
In this embodiment, in order to avoid the reverse connection of the circuit, the circuit further includes an anti-reverse connection unit 11, where the anti-reverse connection unit 11 is disposed between the voltage dividing unit 16 and the high level input terminal 10, and includes a diode VD 1.
When the circuit is in misoperation, an input signal is unstable, and high-frequency pulses can be generated, so that the normal operation of the circuit is influenced. In order to solve the interference caused by the malfunction, the present embodiment further includes an anti-interference unit 14, where the anti-interference unit 14 is connected to the input signal terminal 12, and includes a plurality of capacitors connected in parallel, such as the capacitor C1, the capacitor C2, and the capacitor C3 in fig. 2, and plays a role in absorbing the high-frequency pulse, so as to eliminate the interference caused by the malfunction.
In this embodiment, the overvoltage protection device 13 is further included, and the overvoltage protection device 13 is disposed between the reference voltage comparator 14 and the input signal terminal 12 and includes a diode VD2 connected in reverse. When a normal low-current negative signal is input, the diode VD2 is under reverse bias, and only weak reverse current flows through the diode VD2, which is called leakage current; when rainwater is in short circuit with other negative signals, the reverse current is increased sharply, the diode VD2 is broken down, and the unidirectional conducting characteristic is lost.
At the moment when the output end of the voltage dividing unit 16, i.e., the point C, is switched between high and low levels, the gate of the MOS transistor Q2 is damaged. In order to avoid this phenomenon, the protection circuit further comprises a controllable switch protection unit 19, wherein the controllable switch protection unit 19 comprises a capacitor C4, and the capacitor C4 is connected in parallel between the source S and the gate G of the MOS transistor Q2.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. A large current control circuit based on rain-proof short circuit interference is characterized by comprising
The high-level input end is connected with the positive electrode of the driving/bulb and provides a high-level input;
the reference end of the reference voltage comparator is externally connected with the input signal end, and the anode of the reference voltage comparator is grounded;
the voltage division unit comprises a first input end, a second input end and an output end, wherein the first input end is connected with the high-level input end, and the second input end is connected with the cathode of the reference voltage comparator; the output end is connected with the control end of the controllable switch unit;
and the control end of the controllable switch unit is connected with the output end of the voltage dividing unit, the first end of the controllable switch unit is grounded, and the second end of the controllable switch unit is connected with the negative electrode of the driver/bulb.
2. The large current control circuit based on rainwater short circuit interference prevention is characterized by further comprising an anti-reverse connection unit, wherein the anti-reverse connection unit is arranged between the voltage division unit and the high-level input end and comprises a diode VD 1.
3. The heavy current control circuit based on rainwater short circuit interference prevention according to claim 1, characterized by further comprising an anti-interference unit, wherein the anti-interference unit is connected with the input signal end and comprises a plurality of capacitors connected in parallel.
4. The large current control circuit based on rainwater short circuit interference prevention is characterized by further comprising an overvoltage protection unit, wherein the overvoltage protection unit is arranged between the reference voltage comparator and the input signal end and comprises a reversely connected diode VD 2.
5. The large current control circuit based on rainwater short circuit interference prevention according to claim 1, wherein the voltage dividing unit comprises a first resistor R2, a second resistor R3, a third resistor R5; a first end of the first resistor R2 is used as a first input end of the voltage division unit and is connected with a high-level input; the second end of the first resistor R2 and the first end of the second resistor R3 are connected to be used as a second input end of the voltage division unit and connected with the cathode of the reference voltage comparator; the second end of the second resistor R3 is connected to the first end of the third resistor R5 as the output end of the voltage dividing unit, and is connected to the control end of the controllable switch unit.
6. A heavy current control circuit based on rain short circuit interference according to claim 1 or 5, characterized in that the controllable switch unit comprises a MOS transistor Q2.
7. The large current control circuit based on rainwater short circuit interference prevention according to claim 6, further comprising a controllable switch protection unit, wherein the controllable switch protection unit comprises a capacitor C4, and the capacitor C4 is connected in parallel between the source and the gate of the MOS transistor Q2.
8. The heavy current control circuit based on rainwater short circuit interference prevention as claimed in claim 1, wherein the model of the reference voltage comparator is ME 432.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121752488.5U CN216057579U (en) | 2021-07-29 | 2021-07-29 | Heavy current control circuit based on rain-proof short circuit interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121752488.5U CN216057579U (en) | 2021-07-29 | 2021-07-29 | Heavy current control circuit based on rain-proof short circuit interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216057579U true CN216057579U (en) | 2022-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121752488.5U Active CN216057579U (en) | 2021-07-29 | 2021-07-29 | Heavy current control circuit based on rain-proof short circuit interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216057579U (en) |
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2021
- 2021-07-29 CN CN202121752488.5U patent/CN216057579U/en active Active
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