CN210666437U - Switching value input acquisition circuit - Google Patents

Abstract

The utility model discloses a switching value input acquisition circuit, the trigger power supply electric connection that work acquisition circuit's power input end and singlechip provided for work acquisition circuit, the AD conversion end electric connection of work acquisition circuit's AD conversion end and singlechip, the switching signal sampling end connection switch signal's of work acquisition circuit input end, the trigger power supply electric connection that standby acquisition circuit's power input end and singlechip provided for standby acquisition circuit, standby acquisition circuit's switching signal sampling end connection switch signal's input, standby acquisition circuit's interrupt wake-up signal end sends wake-up signal to system chip, and be provided with the mutual interference prevention circuit between work acquisition circuit's switching signal sampling end and standby acquisition circuit's the switching signal sampling end. The utility model discloses a standby acquisition circuit can effectual reduction consumption's loss, improves car battery's life.

Description

Switching value input acquisition circuit

Technical Field

The utility model relates to a car switching value input acquisition circuit.

Background

In the existing input acquisition circuit for switching signals of opening or closing of an automobile door, opening or closing of a lock and the like of an automobile, as shown in fig. 1, the input of the switching signals is acquired by a work acquisition circuit. No matter whether a switch on the automobile generates a trigger signal or not, the single chip microcomputer and the work acquisition circuit are both in a power-on state, namely when the circuit is in a dormant state, because the switch signal needs to be sampled regularly, the single chip microcomputer is required to be supplied with power from time to time, and the single chip microcomputer works as the work acquisition circuit to supply the trigger signal. Therefore, when the circuit is in a dormant state, higher power consumption is generated, and the service life of the automobile battery is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a car switching value input acquisition circuit of low-power consumption.

Including work acquisition circuit and standby acquisition circuit, the trigger power supply electric connection that work acquisition circuit's power input end and singlechip provided for work acquisition circuit, the AD conversion end electric connection of work acquisition circuit's AD conversion end and singlechip, the switching signal sampling end of work acquisition circuit connect switch signal's input, the trigger power supply electric connection that standby acquisition circuit's power input end and singlechip provided for standby acquisition circuit, standby acquisition circuit's switching signal sampling end connect switch signal's input, standby acquisition circuit's interrupt awakening signal end sends awakening signal to system chip, and is provided with the mutual interference circuit of preventing between work acquisition circuit's switching signal sampling end and standby acquisition circuit's the switching signal sampling end.

The switching value input acquisition circuit is composed of a standby acquisition circuit and a working acquisition circuit. When the circuit is in a standby state, the switching state of the input end of the switching signal is collected by the switching signal sampling end of the standby collection circuit and changes, the standby collection circuit can generate a pulse with a certain width, the input wake-up circuit in the system chip is triggered from the interrupt wake-up signal end, the system chip supplies power to the single chip microcomputer after receiving the wake-up pulse, the single chip microcomputer just puts the working collection circuit into a working state, the standby collection circuit stops working, and whether the state transition of the input switch is effective or not is confirmed again. And the work acquisition circuit is responsible for acquiring an input switch value (action of a shift bit signal of the switch) when the circuit works normally. The two parts of circuits do not work simultaneously, and the state of one part is not influenced when the other part works. In a standby state, the power consumption of the circuit is low, and only the standby acquisition circuit and the system chip are in working states, so that the power consumption of the whole circuit is reduced, and the service life of the automobile battery is prolonged.

Drawings

Fig. 1 is a circuit diagram of an input acquisition circuit of switching signals of opening or closing of a door, opening or closing of a lock and the like of a conventional automobile in the background art;

fig. 2 is a schematic diagram of a switching value input acquisition circuit according to the present invention;

fig. 3 is a circuit diagram of an input acquisition circuit with low power consumption according to an embodiment of the present invention.

Detailed Description

As shown in fig. 2, a switching value input acquisition circuit, including work acquisition circuit and standby acquisition circuit, the trigger power supply electric connection that work acquisition circuit's power input end and singlechip provided for work acquisition circuit, the AD converting end of work acquisition circuit and the AD converting end electric connection of singlechip, the switching signal sampling end of work acquisition circuit connects switching signal's input, standby acquisition circuit's power input end and singlechip are the trigger power supply electric connection that standby acquisition circuit provided, and standby acquisition circuit's switching signal sampling end connects switching signal's input, and standby acquisition circuit's interrupt awakening signal end sends awakening signal to system chip, and is provided with the anti-interference circuit between work acquisition circuit's switching signal sampling end and standby acquisition circuit's the switching signal sampling end.

The circuit consists of a standby acquisition circuit and a working acquisition circuit. When the circuit is in a standby state, the switching state of the input end of the switching signal is collected by the switching signal sampling end of the standby collection circuit and changes, the standby collection circuit can generate a pulse with a certain width, the input wake-up circuit in the system chip is triggered from the interrupt wake-up signal end, the system chip supplies power to the single chip microcomputer after receiving the wake-up pulse, the single chip microcomputer just puts the working collection circuit into a working state, the standby collection circuit stops working, and whether the state transition of the input switch is effective or not is confirmed again. And the work acquisition circuit is responsible for acquiring an input switch value (action of a shift bit signal of the switch) when the circuit works normally. The two parts of circuits do not work simultaneously, and the state of one part is not influenced when the other part works. In a standby state, the power consumption of the circuit is low, and only the standby acquisition circuit and the system chip are in working states, so that the power consumption of the whole circuit is reduced, and the service life of the automobile battery is prolonged.

As shown in fig. 3, the anti-crosstalk circuit includes a diode D1 and a diode D2, an anode of the diode D1 is electrically connected to the operation acquisition circuit, and a cathode of the diode D1 is electrically connected to the input terminal of the switching signal. The anode of the diode D2 is electrically connected to the charging capacitor C1, the charging capacitor C2 and the pull-up resistor R4 of the standby acquisition circuit, and the cathode of the diode D2 is electrically connected to the input terminal of the switching signal. The mutual interference prevention circuit is arranged, so that the mutual interference between the working acquisition circuit and the standby acquisition circuit can be effectively guaranteed.

The work acquisition circuit comprises a voltage division circuit and a pull-up resistor R1, an AD conversion end of the voltage division circuit is electrically connected with an AD conversion end of the single chip microcomputer, a switch signal sampling end of the voltage division circuit is respectively connected with the pull-up resistor R1 and the mutual interference prevention circuit, and the pull-up resistor R1 is electrically connected with a trigger power supply provided by the single chip microcomputer for the work acquisition circuit.

The voltage dividing circuit comprises a resistor R2 and a resistor R3, one ends of the resistor R2 and the resistor R3 are electrically connected with an AD conversion end of the single chip microcomputer, the other end of the resistor R2 is respectively connected with the anode of the resistor R1 and the anode of the diode D1, and the other end of the resistor R3 is grounded.

The standby acquisition circuit comprises a switching triode Q1, a switching triode Q2, a charging capacitor C1, a charging capacitor C2, a current-limiting resistor R5, a current-limiting resistor R6, a current-limiting resistor R7, a current-limiting resistor R8, a pull-up resistor R4 and a pull-down resistor R9. An emitting electrode of the switching triode Q1 and one end of the pull-up resistor R4 are electrically connected with a trigger power supply provided by the single chip microcomputer for the standby acquisition circuit, a base electrode of the switching triode Q1 is sequentially connected with the current-limiting resistor R7, the current-limiting resistor R5 and the charging capacitor C1, and a collector electrode of the switching triode Q1 is connected with the current-limiting resistor R8. The charging capacitor C1 is electrically connected with the anti-mutual-interference circuit, and the current-limiting resistor R8 is connected with the interrupt wake-up signal end. The collector of the switching triode Q2 is connected with a current-limiting resistor R7 and a current-limiting resistor R5, the base of the switching triode Q2 is sequentially connected with a current-limiting resistor R6, a charging capacitor C2 and a pull-up resistor R4, the emitter of the switching triode Q2 is grounded and connected with a pull-down resistor R9, and the other end of the pull-down resistor R9 is connected with an interrupt wake-up signal end and the current-limiting resistor R8. A charging capacitor C1 and the anode of a diode D2 of the anti-mutual-interference circuit are connected between the charging capacitor C2 and the pull-up resistor R4, a switching triode Q1 is a PNP type switching triode, and the switching triode Q2 is an NPN type switching triode.

In the standby state, the single chip microcomputer, the system chip, the work acquisition circuit and the standby acquisition circuit are all in the dormant state, and at the moment, the whole circuit is in the low power consumption state. When the input switch is changed from open to closed, the level of the input end point of the switch signal is changed from high to low, the charging capacitor C1 is charged, and the charged current flows through the base of the switching triode Q1, the current-limiting resistor R7 and the current-limiting resistor R5 from the triggering power supply end provided by the single chip microcomputer for the standby acquisition circuit to charge the charging capacitor C1. This current causes switching transistor Q1 to be in a conductive state. After the switching triode Q1 is conducted, the voltage of the interrupt wake-up signal end changes from low to high, a wake-up signal is sent to the system chip, the system chip supplies power to the single chip microcomputer after receiving the wake-up pulse, and the single chip microcomputer enables the whole circuit to be in a working state. When the input switch is changed from closed to open, the level of the input end point of the switching signal is changed from low to high, the charging capacitor C2 is charged, the charged current flows from the trigger power supply end provided by the singlechip for the standby acquisition circuit, flows through the pull-up resistor R4, charges the charging capacitor C2, and then flows into the ground from the current limiting resistor R6 and the switching triode Q2. This current causes switching transistor Q2 to conduct. After the switching transistor Q2 is turned on, another current flows through the switching transistor Q1 and the current limiting resistor R7 from the trigger power supply end provided by the single chip microcomputer for the standby acquisition circuit, so that the switching transistor Q1 is turned on. After the switching triode Q1 is conducted, the voltage of the interrupt wake-up signal end changes from low to high, a wake-up signal is sent to the system chip, the system chip supplies power to the single chip microcomputer after receiving the wake-up pulse, and the single chip microcomputer enables the whole circuit to be in a working state. When the whole circuit is in a working state, the working acquisition circuit is responsible for acquiring an input switch value (action of a gear shifting position signal of the switch).

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (6)

1. The utility model provides a switching value input acquisition circuit, includes work acquisition circuit and standby acquisition circuit, the trigger power electric connection that work acquisition circuit's power input end and singlechip provided for work acquisition circuit, the AD converting terminal electric connection of work acquisition circuit's AD converting terminal and singlechip, the switching signal sampling terminal connection switch signal's of work acquisition circuit input, its characterized in that: the power input end of the standby acquisition circuit is electrically connected with the trigger power supply provided by the single chip microcomputer for the standby acquisition circuit, the switch signal sampling end of the standby acquisition circuit is connected with the input end of the switch signal, the interrupt awakening signal end of the standby acquisition circuit sends an awakening signal to the system chip, and an anti-mutual-interference circuit is arranged between the switch signal sampling end of the work acquisition circuit and the switch signal sampling end of the standby acquisition circuit.

2. The switching value input acquisition circuit according to claim 1, characterized in that: the standby acquisition circuit comprises a switching triode Q1, a switching triode Q2, a charging capacitor C1, a charging capacitor C2, a current-limiting resistor R5, a current-limiting resistor R6, a current-limiting resistor R7, a current-limiting resistor R8, a pull-up resistor R4 and a pull-down resistor R9;

an emitting electrode of the switching triode Q1 and one end of the pull-up resistor R4 are electrically connected with a trigger power supply provided by the singlechip for the standby acquisition circuit, a base electrode of the switching triode Q1 is sequentially connected with the current-limiting resistor R7, the current-limiting resistor R5 and the charging capacitor C1, and a collector electrode of the switching triode Q1 is connected with the current-limiting resistor R8;

the charging capacitor C1 is electrically connected with the anti-mutual-interference circuit, and the current-limiting resistor R8 is connected with an interrupt wake-up signal end;

a collector of the switching triode Q2 is connected with a current-limiting resistor R7 and a current-limiting resistor R5, a base of the switching triode Q2 is sequentially connected with the current-limiting resistor R6, a charging capacitor C2 and a pull-up resistor R4, an emitter of the switching triode Q2 is grounded and connected with a pull-down resistor R9, and the other end of the pull-down resistor R9 is connected with an interrupt wake-up signal end and the current-limiting resistor R8;

a charging capacitor C1 and an anti-mutual-interference circuit are connected between the charging capacitor C2 and the pull-up resistor R4.

3. The switching value input acquisition circuit according to claim 2, characterized in that: the anti-mutual-interference circuit comprises a diode D1 and a diode D2, the anode of the diode D1 is electrically connected with the working acquisition circuit, the cathode of the diode D1 is electrically connected with the input end of a switching signal, the anode of the diode D2 is electrically connected with a charging capacitor C1, a charging capacitor C2 and a pull-up resistor R4 of the standby acquisition circuit, and the cathode of the diode D2 is electrically connected with the input end of the switching signal.

4. The switching value input acquisition circuit according to claim 2, characterized in that: the switching triode Q1 is a PNP type switching triode, and the switching triode Q2 is an NPN type switching triode.

5. The switching value input acquisition circuit according to claim 1, characterized in that: the work acquisition circuit comprises a voltage division circuit and a pull-up resistor R1, an AD conversion end of the voltage division circuit is electrically connected with an AD conversion end of the single chip microcomputer, a switching signal sampling end of the voltage division circuit is respectively connected with the pull-up resistor R1 and the mutual interference prevention circuit, and the pull-up resistor R1 is electrically connected with a trigger power supply provided by the single chip microcomputer for the work acquisition circuit.

6. The switching value input acquisition circuit according to claim 5, characterized in that: the voltage division circuit comprises a resistor R2 and a resistor R3, one ends of the resistor R2 and the resistor R3 are electrically connected with an AD conversion end of the single chip microcomputer, the other end of the resistor R2 is respectively connected with the anode of the resistor R1 and the anode of the diode D1, and the other end of the resistor R3 is grounded.

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