Improved vehicle-mounted power supply on-off control circuit
By designing an improved power switch control circuit in the vehicle inverter, and using the cooperation of the filter circuit and the microcontroller U1 to identify and filter interference signals, the problem of abnormal power switch and shutdown of the vehicle inverter is solved, and the stable operation of the power supply system is achieved.
Patent Information
- Application Number
- CN202422101933.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-28
AI Technical Summary
In the application of on-board inverter, due to the small space and complex power consumption environment, interfering signals are easily generated on the switch lines of the inverter, resulting in abnormal power on and off of the on-board power supply, which in turn affects the stability of the power supply system.
An improved vehicle power switch control circuit is designed to identify and filter interference signals through the cooperation between the filter circuit and the microcontroller U1 to ensure the normal power switch of the vehicle power switch. The circuit includes a microprocessor U1, a driving component and a filter circuit. The input end of the microprocessor U1 is connected to the power supply voltage signal through the filter circuit, and the power switch of the vehicle power supply is controlled through the driving component.
By filtering out interference signals, abnormal power switches on and off the vehicle power supply are avoided and the stable operation of the power supply system is ensured.
Smart Images
Figure CN223039886U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of power switch control, and particularly relates to an improved on-vehicle power supply switching control circuit. Background Art
[0002] An inverter is a power supply device that can invert the direct current of a battery into alternating current for load use. Due to its characteristics of high efficiency and convenience, it has been widely used. Currently, inverters are widely used in special vehicles, offices, communication machine rooms, etc., bringing great convenience to users.
[0003] However, when the inverter is used in a vehicle, for convenience of use, the switch of the inverter needs to be installed in a place where the driver and passengers can easily operate it. A relatively long wire is required to connect the switch and the inverter. Moreover, the switch usually uses a touch switch (press once to turn on, press again to turn off, and repeat). Due to the narrow space and complex electrical environment in the vehicle, a relatively large interference will be caused on the led-out switch wire, and this interference will cause abnormal startup and shutdown of the on-vehicle power supply, thus resulting in unstable operation of the power supply system. Summary of the Utility Model
[0004] In view of the above problems in the prior art, the purpose of the utility model is to provide an improved on-vehicle power supply switching control circuit, which eliminates interference signals through the mutual cooperation of a filtering circuit and a microcontroller U1, and ensures the normal operation of the on-vehicle power supply.
[0005] An improved on-vehicle power supply switching control circuit includes a microprocessor U1, a driving component, and a filtering circuit. The input end of the microprocessor U1 is connected to the power supply voltage signal through the filtering circuit. A touch switch SW1 is also connected to the power supply. The output control end of the microprocessor U1 is connected to the driving component. The driving component includes a triode Q3 and a triode Q2. The triode Q2 is connected to the power supply, and the triode Q3 is connected to the microprocessor U1. The microprocessor U1 drives the triode Q3 to drive the triode Q2, thereby controlling the output of the triode Q2. The output end of the triode Q2 is connected to the on-vehicle power supply switching signal input end.
[0006] Preferably, the filtering circuit includes a resistor R9, a resistor R7, and a capacitor C4. The input end of the microprocessor U1 is connected to the power supply through the resistor R9, the touch switch SW1, and the resistor R6 connected in series in sequence. The resistor R7 and the capacitor C4 are connected in parallel to the input end of the microprocessor U1, and the other ends of the resistor R7 and the capacitor C4 are grounded.
[0007] Preferably, a voltage stabilizing diode ZD1 is further connected to the input end of the microprocessor U1, and the other end of the voltage stabilizing diode ZD1 is grounded.
[0008] Preferably, the output control terminal of the microprocessor U1 is connected to the base of the triode Q3 through the resistor R4. The collector of the triode Q3 is connected to the base of the triode Q2 through the resistor R3, and the emitter of the triode Q3 is grounded. A resistor R2 is connected between the base and the emitter of the triode Q2. The emitter of the triode Q2 is connected to the power supply, and the collector of the triode Q2 is used as the output terminal and is connected to the on / off signal input terminal of the vehicle-mounted power supply.
[0009] The beneficial effect of the present invention is that in this improved vehicle-mounted power supply on / off control circuit, through the mutual cooperation between the filtering circuit and the microcontroller U1, interference signals are filtered out. The microprocessor U1 filters and identifies the switch signals input by the touch switch SW1, the resistors R9 and R7, the zener diode ZD1, and the capacitor C4, and then outputs a driving signal through the output control terminal of the microprocessor U1 to control the operation of the driving component, thereby controlling the on / off of the vehicle-mounted power supply. By filtering out interference signals, the problem of abnormal on / off is avoided. Description of the Drawings
[0010] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:
[0011] Figure 1 is the circuit diagram of the present invention. Detailed Embodiments
[0012] Embodiment 1
[0013] As Figure 1 shown, an improved vehicle-mounted power supply on / off control circuit is used for filtering and identifying the on / off signals of the vehicle-mounted power supply through the cooperation of software and hardware. Specifically, it includes a microprocessor U1, triodes Q2 and Q3, a touch switch SW1, a zener diode ZD1, resistors R2, R3, R4, R6, R7, R9, and a capacitor C4. Among them, the model of the microprocessor U1 is N76E003.
[0014] Among them, pin 2 of the microprocessor U1 is connected to the power supply through the resistor R9, the touch switch SW1, and the resistor R6, and the resistor R9, the touch switch SW1, and the resistor R6 are connected in series.
[0015] The input terminal of the microprocessor U1 is also connected to a filtering circuit. The filtering circuit includes the resistors R9, R7, and the capacitor C4. The resistor R7 and the capacitor C4 are connected in parallel to the input terminal of the microprocessor U1, and the other ends of the resistor R7 and the capacitor C4 are grounded. The input terminal of the microprocessor U1 is also connected to a zener diode ZD1, and the other end of the zener diode ZD1 is grounded.
[0016] Pin 1 of the microprocessor U1 is connected to the base of the triode Q3 through the resistor R4. The collector of the triode Q3 is connected to the base of the triode Q2 through the resistor R3, and the emitter of the triode Q3 is connected to the ground. A resistor R2 is connected between the base and the emitter of the triode Q2. At the same time, the emitter of the triode Q2 is connected to the power supply, and the collector of the triode Q2 is connected to the on / off signal input terminal of the vehicle power supply as the output terminal OUT.
[0017] In this embodiment, when the vehicle power supply is turned on and working, press the touch switch SW1 to connect the touch switch SW1 for about 1 second. At this time, the power supply passes through the resistor R6 and the touch switch SW1 to reach the filter circuit composed of the resistor R9, the resistor R7, and the capacitor C4. After being filtered by the hardware filter circuit, it is sent to pin 2 of the microprocessor U1. After being filtered by the built-in software program of the microprocessor U1, it is judged as a valid turn-on signal. At this time, the microprocessor U1 outputs a high level through pin 1, making the triode Q3 conduct. After the triode Q3 conducts, the triode Q2 conducts. After the triode Q2 conducts, the power supply voltage of the power supply passes through the output terminal OUT of the triode Q2 and is connected to the on / off signal input terminal of the vehicle power supply, so that the vehicle power supply completes the turn-on operation.
[0018] When it is necessary to turn off the power, press the touch switch SW1 again for about 1 second. Through the same process as above, when the microprocessor U1 judges that the signal is a valid turn-off signal, the microprocessor U1 will change the high level output by pin 1 to a low level. At this time, the triodes Q3 and Q2 are cut off, thus disconnecting the connection between the power supply and the output terminal of the triode Q2, and the turn-on input voltage of the vehicle power supply is disconnected, so that the vehicle power supply completes the turn-off operation.
[0019] The above process is a complete process of one turn-on and one turn-off. If the touch switch SW1 is not pressed and there is only interference signal, since the interference signal cannot reach the height and duration of the voltage signal when the touch switch SW1 is connected, the microprocessor U1 will recognize it as an invalid signal and will not process it, thus filtering out the influence of the interference and enabling the vehicle power supply to perform normal on / off operations.
[0020] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. An improved vehicle-mounted power on / off control circuit, characterized in that: It includes a microprocessor U1, a driving component and a filtering circuit. The input end of the microprocessor U1 is connected to a power supply voltage signal through the filtering circuit. A touch switch SW1 is also connected to the power supply. The output control end of the microprocessor U1 is connected to a driving component, and the driving component includes a transistor Q3 and a transistor Q2. The transistor Q2 is connected to a power supply, and the transistor Q3 is connected to the microprocessor U1. The microprocessor U1 drives the transistor Q3 and drives the transistor Q2, thereby controlling the output of the transistor Q2. The output end of the transistor Q2 is connected to the vehicle power switch signal input end.
2. The improved vehicle-mounted power on / off control circuit according to claim 1 is characterized in that: The filter circuit includes a resistor R9, a resistor R7 and a capacitor C4. The input end of the microprocessor U1 is connected to the power supply through the resistor R9, the touch switch SW1 and the resistor R6 connected in series in sequence. The resistor R7 and the capacitor C4 are connected in parallel to the input end of the microprocessor U1, and the other ends of the resistor R7 and the capacitor C4 are grounded.
3. The improved vehicle-mounted power on / off control circuit according to claim 1 is characterized in that: The input end of the microprocessor U1 is also connected to a voltage stabilizing diode ZD1, and the other end of the voltage stabilizing diode ZD1 is grounded.
4. The improved vehicle-mounted power on / off control circuit according to claim 1, characterized in that: The output control terminal of the microprocessor U1 is connected to the B pole of the transistor Q3 through the resistor R4, the C pole of the transistor Q3 is connected to the B pole of the transistor Q2 through the resistor R3, and the E pole of the transistor Q3 is grounded; A resistor R2 is connected between the B pole and the E pole of the transistor Q2, the E pole of the transistor Q2 is connected to the power supply, and the C pole of the transistor Q2 is connected to the vehicle power switch signal input terminal as an output terminal.