CN210310141U - Acquisition circuit of automobile steering lamp signal - Google Patents

Abstract

The utility model discloses a circuit for acquiring automobile steering lamp signals, include: the circuit comprises a current limiting resistor R1, a reverse cut-off diode D1, a charging and discharging capacitor C1, a current limiting resistor R2, an isolation optical coupler U1 and a pull-up resistor R3, wherein the first end of the current limiting resistor R1 is used for accessing a turn signal, the second end of the current limiting resistor R1 is electrically connected to the anode of the reverse cut-off diode D1, the cathode of the reverse cut-off diode D1 is electrically connected to the anode of the charging and discharging capacitor C1, and the cathode of the charging and discharging capacitor C1 is electrically connected to the system ground; a first end of the current limiting resistor R2 is electrically connected to a cathode of the reverse cut-off diode D1, a second end of the current limiting resistor R2 is electrically connected to an anode of the isolation optocoupler U1, a cathode of the optocoupler U1 is electrically connected to a system ground, an emitter of the optocoupler U1 is grounded, a collector of the optocoupler U1 is electrically connected to a first end of the pull-up resistor R3, and a second end of the pull-up resistor R3 is electrically connected to a Vcc end; the collector of the optocoupler U1 is also electrically connected to a control unit on the vehicle.

Description

Acquisition circuit of automobile steering lamp signal

Technical Field

The utility model relates to an electron technology among the automotive filed especially relates to an acquisition circuit of auto steering lamp signal.

Background

With the continuous development and application of the car networking technology, the signal extraction of the vehicle-mounted original sensor gradually becomes one of the essential functions of the host of the vehicle-mounted end used in the car networking. In order to sense the state of a vehicle steering lamp, a signal acquisition line is generally connected to a vehicle signal lamp in the prior art, and the steering lamp signal is connected to a vehicle-mounted computer; according to the flickering of the flash lamp, the signal acquisition MCU receives the steering lamp signal with the constantly changing height, and then the software algorithm is matched to know whether the steering lamp is turned on or not.

However, the flashing frequency of the turn signal lamp is generally 70-90 times/min, which requires the software algorithm to perform corresponding algorithm adjustment according to different vehicle model frequencies.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect of the prior art, the utility model provides a collecting circuit of car indicator signal, include: a current limiting resistor R1, a reverse cut-off diode D1, a charging and discharging capacitor C1, a current limiting resistor R2, an isolating optocoupler U1 and a pull-up resistor R3, wherein,

a first end of the current limiting resistor R1 is used for receiving a turn signal, a second end of the current limiting resistor R1 is electrically connected to an anode of the reverse cut-off diode D1, a cathode of the reverse cut-off diode D1 is electrically connected to an anode of the charge and discharge capacitor C1, and a cathode of the charge and discharge capacitor C1 is electrically connected to a system ground;

a first end of the current limiting resistor R2 is electrically connected to a cathode of the reverse blocking diode D1, a second end of the current limiting resistor R2 is electrically connected to an anode of the isolation optocoupler U1, a cathode of the isolation optocoupler U1 is electrically connected to a system ground, an emitter of the isolation optocoupler U1 is grounded, a collector of the isolation optocoupler U1 is electrically connected to a first end of the pull-up resistor R3, and a second end of the pull-up resistor R3 is electrically connected to a Vcc end;

the collector electrode of the isolation optical coupler U1 is also electrically connected to a vehicle-mounted control unit;

the current-limiting resistor R1, the reverse cut-off diode D1 and the charging and discharging capacitor C1 jointly form a detection circuit of the acquisition circuit of the automobile turn signal, and the current-limiting resistor R2, the optical coupler U1 and the pull-up resistor R3 jointly form an isolation circuit of the acquisition circuit of the automobile turn signal.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Preferably, the vehicle-mounted control unit is an MCU or an FPGA.

Preferably, the Vcc terminal is DC 3.3V.

Compared with the prior art, the utility model processes the signal of the steering lamp through the circuit design on the hardware, and the control unit/MCU receives the stable level signal as long as the steering lamp is in the open state; the circuit design is suitable for any vehicle type, and is high in detection accuracy, simple and convenient.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an acquisition circuit of an automobile turn signal of the present invention;

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Please refer to fig. 1, which is a schematic structural diagram of an acquisition circuit for a signal of an automobile turn signal according to the present invention. The acquisition circuit of car indicator signal includes: a current limiting resistor R1, a reverse cut-off diode D1, a charging and discharging capacitor C1, a current limiting resistor R2, an isolating optocoupler U1 and a pull-up resistor R3, wherein,

the current-limiting resistor R1 has a first terminal for receiving a turn signal, a second terminal electrically connected to the anode of the reverse cut-off diode D1, the cathode of the reverse cut-off diode D1 is electrically connected to the anode of the charge-discharge capacitor C1, and the cathode of the charge-discharge capacitor C1 is electrically connected to the system ground;

a first end of the current-limiting resistor R2 is electrically connected to a cathode of the reverse blocking diode D1, a second end of the current-limiting resistor R2 is electrically connected to an anode of the isolating optocoupler U1, a cathode of the isolating optocoupler U1 is electrically connected to a system ground, an emitter of the isolating optocoupler U1 is grounded, a collector of the isolating optocoupler U1 is electrically connected to a first end of the pull-up resistor R3, a second end of the pull-up resistor R3 is electrically connected to a Vcc end, and the Vcc end is DC 3;

the collector electrode of the isolation optical coupler U1 is also electrically connected to a vehicle-mounted control unit, such as an MCU or an FPGA;

current-limiting resistor R1, reverse cut-off diode D1 and charge-discharge electric capacity C1 constitute jointly the utility model discloses a car indicator signal's acquisition circuit's detection circuitry, current-limiting resistor R2, optical coupler U1 and pull-up resistance R3 constitute jointly the utility model discloses a car indicator signal's acquisition circuit's isolating circuit.

The utility model discloses a working principle of acquisition circuit of auto steering lamp signal as follows:

when the turn signal is not turned on, the signal input end of the turn signal is flash input for 70-90 times/min.

When the turn signal lamp is turned on, the current flows through the current limiting resistor R1 and the reverse cut-off diode D1, the charging and discharging capacitor C1 is charged, the current flows through the current limiting resistor R2, the isolation optocoupler U1 is switched on, the first end of the pull-up resistor R3 is at a low level at the moment, and the control unit/MCU receives the low level.

After the turn signal lamp is extinguished, no current passes through the current limiting resistor R1 and the reverse cut-off diode D1, the charging and discharging capacitor C1 discharges, the reverse cut-off diode D1 cuts off, the current passes through the current limiting resistor R2, the isolation optocoupler U1 is turned on, at the moment, the first end of the pull-up resistor R3 is at a low level, and the control unit/MCU receives the low level.

Before the charging and discharging capacitor C1 is discharged, the turn signal lamp is turned on and is charged again.

During circuit design, the charging current can be changed by adjusting the size of the current limiting resistor R1, and the discharging time can be changed by adjusting the sizes of the charging and discharging capacitor C1 and the current limiting resistor R2.

Therefore, the utility model discloses a collection circuit of car indicator signal can convert the indicator into specific level by flash signal through above circuit to supply the control unit MCU to open the indicator and whether accurately judge.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (3)

1. The utility model provides an acquisition circuit of car indicator signal which characterized in that includes: a current limiting resistor R1, a reverse cut-off diode D1, a charging and discharging capacitor C1, a current limiting resistor R2, an isolating optocoupler U1 and a pull-up resistor R3, wherein,

a first end of the current limiting resistor R1 is used for receiving a turn signal, a second end of the current limiting resistor R1 is electrically connected to an anode of the reverse cut-off diode D1, a cathode of the reverse cut-off diode D1 is electrically connected to an anode of the charge and discharge capacitor C1, and a cathode of the charge and discharge capacitor C1 is electrically connected to a system ground;

a first end of the current limiting resistor R2 is electrically connected to a cathode of the reverse blocking diode D1, a second end of the current limiting resistor R2 is electrically connected to an anode of the isolation optocoupler U1, a cathode of the isolation optocoupler U1 is electrically connected to a system ground, an emitter of the isolation optocoupler U1 is grounded, a collector of the isolation optocoupler U1 is electrically connected to a first end of the pull-up resistor R3, and a second end of the pull-up resistor R3 is electrically connected to a Vcc end;

the collector electrode of the isolation optical coupler U1 is also electrically connected to a vehicle-mounted control unit;

the current-limiting resistor R1, the reverse cut-off diode D1 and the charging and discharging capacitor C1 jointly form a detection circuit of the acquisition circuit of the automobile turn signal, and the current-limiting resistor R2, the optical coupler U1 and the pull-up resistor R3 jointly form an isolation circuit of the acquisition circuit of the automobile turn signal.

2. The acquisition circuit of the automobile turn signal according to claim 1, wherein the vehicle-mounted control unit is an MCU or an FPGA.

3. The acquisition circuit of the automobile turn signal lamp according to claim 1 or 2, wherein the Vcc terminal is DC3.3V.

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