Automotive circuit for preventing ignition of power plug

Abstract

The utility model provides a vehicle power plug ignition prevention circuit, which is applied to the technical field of power supply protection and comprises a microprocessor, a triode, a relay and an AC / DC power supply, and the AC / DC power supply is respectively connected with the microprocessor and the relay. The relay is connected with the on-vehicle power supply socket and the load, the on-vehicle power supply socket is connected with the off-vehicle alternating current power supply plug in an inserted mode, and the microprocessor is further connected with an on-vehicle power-on signal; the microprocessor drives the triode to be conducted or cut off according to a power-on signal or a connection signal between the on-vehicle power supply socket and the off-vehicle alternating current power supply plug, and controls the relay to act through the triode so as to realize the control of power-on or power-off of the load; and the port of the microprocessor for accessing the power-on signal on the vehicle is also connected with a voltage division filter circuit. Through the mutual cooperation of the microprocessor, the triode and the relay, the microprocessor can control the power-on and power-off of the load according to a connection signal or a power-on signal between the power supply plugs so as to avoid the sparking condition.

Description

Technical Field

[0001] The utility model belongs to the technical field of power protection, and particularly relates to a vehicle-mounted power plug anti-spark circuit. Background Art

[0002] Emergency rescue vehicles such as fire trucks and ambulances are important equipment for emergency rescue. In order to ensure that they can depart immediately in case of an emergency, these emergency rescue vehicles must always be kept fully charged and with full air pressure. Therefore, chargers and air pumps are installed on the vehicles to charge and inflate the vehicles. The chargers and air pumps are powered by the ground AC power supply, and the ground AC power supply is plugged into the vehicle through a power supply socket to supply power to the vehicle loads.

[0003] However, since the vehicle power supply socket is directly connected to the load and will work when the power is turned on, during the process of plugging in and unplugging the power supply socket, there is a process of disconnecting to connecting or connecting to disconnecting between the pins and the jacks. Therefore, a sparking phenomenon will occur between the pins and the jacks. Sometimes the sparking will burn out the pins and the jacks, and even bond the pins and the jacks together so that they cannot be disconnected.

[0004] When emergency rescue vehicles such as fire trucks are emergently dispatched, the ground power supply socket will automatically pop open. If the pins and the jacks are burned and bonded together, the ground power supply socket cannot be popped open, which will affect the emergency dispatch work of the vehicle. Summary of the Utility Model

[0005] In view of the above problems in the prior art, the purpose of the utility model is to provide a vehicle-mounted power plug anti-spark circuit. Through the mutual cooperation among the microprocessor, the triode and the relay, the microprocessor can control the on-off of the load according to the connection signal between the power plugs or the power-on signal ACC, so as to avoid the occurrence of sparking.

[0006] A vehicle-mounted power plug anti-spark circuit includes a microprocessor, a triode, a relay and an AC / DC power supply. The AC / DC power supply is respectively connected to the microprocessor and the relay; the relay is respectively connected to the vehicle power supply socket and the load. The vehicle power supply socket is plugged with the vehicle-mounted AC power supply plug. The microprocessor is also connected to the vehicle power-on signal ACC; the microprocessor drives the triode to conduct or cut off according to the power-on signal ACC or the connection signal between the vehicle power supply socket and the vehicle-mounted AC power supply plug, and controls the action of the relay through the triode to realize the control of the load being powered on or off; the port of the microprocessor connected to the vehicle power-on signal ACC is also connected with a voltage dividing and filtering circuit.

[0007] Preferably, the voltage dividing and filtering circuit includes a resistor, a resistor, and a capacitor. The pin 20 of the microprocessor is connected to the power-on signal ACC through a resistor. The resistor and the capacitor are connected in parallel and then connected to the pin 20 of the microprocessor. The pin 20 of the microprocessor is also connected to a voltage stabilizing diode, which is connected in parallel with the resistor and the capacitor. The other ends of the resistor, the capacitor, and the voltage stabilizing diode are all grounded.

[0008] Preferably, the pin 1 of the microprocessor is connected to the B pole of the triode through a resistor. The C pole of the triode is connected to the pin 5 of the relay, and the E pole of the triode is grounded.

[0009] Preferably, the pin 4 of the relay is connected to the DC voltage output terminal VDD of the AC / DC power supply. One side pin of the relay is connected to the L terminal of the vehicle power supply socket, and the other side pin of the relay is connected to the L1 terminal of the load.

[0010] Preferably, the AC power input terminals pin 4 and pin 3 of the AC / DC power supply are respectively connected to the L terminal and the N terminal of the vehicle power supply socket. The pin 1 of the AC / DC power supply is grounded, and the N terminal of the vehicle power supply socket is connected to the N terminal of the load.

[0011] The beneficial effect of the present utility model is that for the vehicle anti-power plug arcing circuit, the microprocessor adjusts and controls the power supply to the vehicle load, which can well coordinate the power supply states when the power supply socket is inserted and ejected, so that there is no current during the insertion or disconnection of the plug pin and the socket, thus avoiding the problem of arcing, and making the insertion and ejection of the power supply socket safer and faster. Description of the Drawings

[0012] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0013] Figure 1 is the circuit diagram of the present utility model. Detailed Embodiments

[0014] Embodiment 1

[0015] As Figure 1 shown, a vehicle anti-power plug arcing circuit is used to control the power supply to the vehicle load, so as to avoid arcing when the power supply plug is inserted and ejected. The vehicle anti-power plug arcing circuit includes a microprocessor U2, a relay RY1, an AC / DC power supply U3, a triode Q1, a resistor R1, a resistor R5, a resistor R8, a voltage stabilizing diode ZD2, and a capacitor C2. Among them, the model of the microprocessor U2 is N76E003.

[0016] Among them, pin 20 of the microprocessor U2 is connected to the power-on signal ACC on the vehicle through the resistor R5. At the same time, the resistor R8, the capacitor C2, and the voltage regulator diode ZD2 are connected in parallel between pin 20 of the microprocessor U2 and the ground. Pin 9 of the microprocessor U2 is connected to the DC voltage output terminal VDD of the AC / DC power supply U3, and pin 7 of the microprocessor U2 is grounded.

[0017] Pin 1 of the microprocessor U2 is connected to the B pole of the triode Q1 through the resistor R1. The C pole of the triode Q1 is connected to pin 5 of the relay RY1, and the E pole of the triode Q1 is grounded. Through the triode Q1, the control signal output by the microprocessor U2 can drive the relay RY1 to act, facilitating the connection and disconnection of the relay RY1.

[0018] Pin 4 of the relay RY1 is connected to the DC voltage output terminal VDD of the AC / DC power supply U3. Pins 1 and 6 of the relay RY1 are connected to the L terminal of the vehicle power supply socket CN2. Pins 3 and 8 of the relay RY1 are connected to the L1 terminal of the load U4. The connection and disconnection between the vehicle power supply socket CN2 and the load U4 are controlled by the on / off of the relay RY1, thereby realizing the power supply control of the load U4.

[0019] At the same time, pins 4 and 3 of the AC / DC power supply U3's AC power input terminal are respectively connected to the L terminal and the N terminal of the vehicle power supply socket CN2. Pin 1 of the AC / DC power supply U3 is grounded. The N terminal of the vehicle power supply socket CN2 is connected to the N terminal of the load U4. Among them, the L1 terminal and the N terminal of the load U4 are respectively connected to the AC power input terminal of the load U4.

[0020] As Figure 1 shown, when the vehicle-mounted AC power supply plug CN1 is inserted into the vehicle socket CN2, at this time, the output of pin 1 of the microprocessor U2 is at a low level, the triode Q1 is cut off, and the relay RY1 is disconnected. At this time, the L1 terminal in the load U4 and the L terminal in the vehicle socket CN2 are not connected, and the load U4 is powered off and does not work. Therefore, there is no current flowing through the power supply plugs at this time, and the generation of sparking can be avoided.

[0021] After a period of delay by the microprocessor U2, when the vehicle-mounted AC power supply plug CN1 and the vehicle socket CN2 have been plugged in, at this time, pin 1 of the microprocessor U2 will output a high level, the triode Q1 conducts and works, and the relay RY1 is attracted. At this time, the L1 terminal in the load U4 and the L terminal in the vehicle socket CN2 are connected, and the load U4 has a voltage input and thus starts to work, charging and inflating the vehicle battery.

[0022] When the vehicle needs to be dispatched emergently, the driver turns the vehicle key. After the vehicle is powered on, the microprocessor U2 will receive the vehicle power-on signal ACC. This power-on signal ACC is sent to pin twenty of the microprocessor U2 after passing through the voltage-dividing and filtering circuit composed of resistor R5, resistor R8, and capacitor C2. After detecting the vehicle power-on signal ACC, the microprocessor U2 immediately changes the high level output from its pin one to a low level, causing the triode Q1 to cut off, the relay RY1 not to be attracted, and the relay contacts to disconnect. At this time, the L1 terminal in the load U4 is not connected to the L terminal in the vehicle socket CN2, so that the load U4 is powered off and stops working, and no current flows through the power supply plug. At this time, the power supply plug completes the ejection operation through the electromagnet. Since there is no current flowing through the power supply plug before ejection, no sparking phenomenon will occur during the ejection process, ensuring the safe and smooth ejection of the power supply plug and enabling the vehicle to be dispatched efficiently.

[0023] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art 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. A vehicle anti-power plug ignition circuit, characterized in that, It includes a microprocessor U2, a triode Q1, a relay RY1, and an AC / DC power supply U3. The AC / DC power supply U3 is respectively connected to the microprocessor U2 and the relay RY1. The relay RY1 is respectively connected to an on-vehicle power supply socket CN2 and a load U4. The on-vehicle power supply socket CN2 is plugged into an off-vehicle AC power supply plug CN1. The microprocessor U2 is also connected to an on-vehicle power-on signal ACC. The microprocessor U2 drives the triode Q1 to conduct or cut off according to the power-on signal ACC or the connection signal between the on-vehicle power supply socket CN2 and the off-vehicle AC power supply plug CN1, and controls the operation of the relay RY1 through the triode Q1 to realize the control of the load U4 being powered on or off. The port of the microprocessor U2 connected to the on-vehicle power-on signal ACC is also connected to a voltage dividing and filtering circuit.

2. The vehicle anti-power plug arcing circuit according to claim 1, characterized in that, The voltage dividing and filtering circuit includes a resistor R5, a resistor R8, and a capacitor C2. The twentieth pin of the microprocessor U2 is connected to the power-on signal ACC through the resistor R5. The resistor R8 and the capacitor C2 are connected in parallel and then connected to the twentieth pin of the microprocessor U2. The twentieth pin of the microprocessor U2 is also connected to a voltage stabilizing diode ZD2. The voltage stabilizing diode ZD2 is connected in parallel with the resistor R8 and the capacitor C2. The other ends of the resistor R8, the capacitor C2, and the voltage stabilizing diode ZD2 are all grounded.

3. The vehicle anti-power plug arcing circuit according to claim 1, characterized in that, The first pin of the microprocessor U2 is connected to the B pole of the triode Q1 through a resistor R1. The C pole of the triode Q1 is connected to the fifth pin of the relay RY1. The E pole of the triode Q1 is grounded.

4. The vehicle anti-power plug arcing circuit according to claim 1, characterized in that, The fourth pin of the relay RY1 is connected to the DC voltage output terminal VDD of the AC / DC power supply U3. One side pin of the relay RY1 is connected to the L terminal of the on-vehicle power supply socket CN2. The other side pin of the relay RY1 is connected to the L1 terminal of the load U4.

5. The vehicle anti-power plug arcing circuit according to claim 1, characterized in that, The fourth and third pins of the AC power input terminal of the AC / DC power supply U3 are respectively connected to the L terminal and the N terminal of the on-vehicle power supply socket CN2. The first pin of the AC / DC power supply U3 is grounded. The N terminal of the on-vehicle power supply socket CN2 is connected to the N terminal of the load U4.

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