CN215345183U - Soft and hard two accuse of motormeter alarm lamp and mutual isolation protection circuit - Google Patents
Soft and hard two accuse of motormeter alarm lamp and mutual isolation protection circuit Download PDFInfo
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- CN215345183U CN215345183U CN202120844083.8U CN202120844083U CN215345183U CN 215345183 U CN215345183 U CN 215345183U CN 202120844083 U CN202120844083 U CN 202120844083U CN 215345183 U CN215345183 U CN 215345183U
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Abstract
The utility model relates to a soft and hard double control and mutual isolation protection circuit of an automobile instrument alarm lamp, which comprises: the alarm lamp control system comprises an alarm lamp loop, an alarm lamp hard control loop and an alarm lamp soft control loop; the alarm lamp hard control loop includes: diode D2 and diode D4; the anode of the diode D4 is connected with the hard wire direct control anode of the whole vehicle, and the cathode is connected with the anode of the alarm lamp loop; the anode of the diode D2 is connected with the cathode of the alarm lamp loop, and the cathode is connected with the hard wire direct control cathode of the whole vehicle; the soft control loop of alarm lamp includes: diode D1 and diode D3; the anode of the diode D3 is connected with the soft control anode, and the cathode is connected with the anode of the alarm lamp loop; the positive pole of diode D1 is connected with the negative pole in alarm lamp return circuit, and the negative pole is connected with soft accuse negative pole. The automobile instrument alarm lamp can be turned on in a soft control mode or in a direct hard control mode of the whole automobile wire harness, has the protection functions of preventing positive and negative reverse connection, preventing reverse power supply string, preventing voltage short circuit and preventing electrical interference, and avoids device failure and poor functions.
Description
Technical Field
The utility model relates to the field of automobile instruments, in particular to a soft and hard double-control and mutual isolation protection circuit for an automobile instrument alarm lamp.
Background
The defects of the current automobile instrument alarm lamp comprise: 1. the control mode of the alarm lamp is single; 2. even if the alarm lamp is double-controlled, but there is no isolation protection, because of the influence of the electric environment of the whole vehicle, the influence of the habitual wiring mode or the wiring error, the circuit and the device are bad, the alarm lamp is often on or off, and the function is invalid.
The actual configuration of the whole vehicle is often uncertain in advance when the money is discharged, and the input control mode of the alarm lamp of the instrument cannot be determined in advance, so that the instrument CAN adapt to any mode of lighting according to a CAN message, lighting after switching value acquisition or directly lighting the wiring harness of the whole vehicle, and the instrument cannot influence each other or cause normal lighting.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems in the prior art, the utility model provides a soft and hard double control and mutual isolation protection circuit for an automobile instrument alarm lamp, and solves the problems in the prior art.
The technical scheme for solving the technical problems is as follows: double-control and mutual isolation protection circuit of motormeter alarm lamp softness and hardness, its characterized in that, protection circuit includes: the alarm lamp control system comprises an alarm lamp loop, an alarm lamp hard control loop and an alarm lamp soft control loop;
the alarm lamp hard control loop comprises: diode D2 and diode D4;
the anode of the diode D4 is connected with the hard wire direct control anode of the whole vehicle, and the cathode is connected with the anode of the alarm lamp loop;
the anode of the diode D2 is connected with the cathode of the alarm lamp loop, and the cathode is connected with the hard wire direct control cathode of the whole vehicle;
the soft control loop of alarm lamp includes: diode D1 and diode D3;
the anode of the diode D3 is connected with the soft control anode, and the cathode of the diode D3 is connected with the anode of the alarm lamp loop;
the anode of the diode D1 is connected with the cathode of the alarm lamp loop, and the cathode is connected with the soft control cathode.
The utility model has the beneficial effects that: the automobile instrument alarm lamp can be turned on in a soft control mode or in a direct hard control mode through the whole automobile wire harness. The double control circuit of the alarm lamp is isolated by diodes D1, D2, D3 and D4, has the protection functions of preventing positive and negative reverse connection, preventing power reverse series, preventing voltage short circuit and preventing electrical interference, and avoids device failure and poor function. The mass production product is applied to the electric environment of the real vehicle, and no failure is found, so that the method is proved to be practical and effective.
On the basis of the technical scheme, the utility model can be further improved as follows.
Further, the alarm lamp circuit includes: a Light Emitting Diode (LED), a resistor R5 and a resistor R6;
the LED is connected with the resistor R6 in parallel and then connected with the resistor R5 in series;
the anode of the light emitting diode LED is connected with the resistor R5 in series to be used as the anode of the alarm lamp loop, and the cathode of the light emitting diode LED is used as the cathode of the alarm lamp loop.
Further, the soft control negative electrode is connected with an NPN type triode Q1;
the base electrode of the NPN type triode Q1 is connected with an alarm lamp software control output signal, the emitting electrode is grounded, and the collector electrode is connected with the positive electrode of a vehicle starting power supply signal IGN and then serves as the soft control negative electrode.
Further, the base electrode of the NPN type triode Q1 is also connected with an alarm lamp software control output signal through a resistor R1;
and a capacitor C1 and a resistor R2 which are connected in parallel are connected between the base electrode and the emitter electrode of the NPN type triode Q1.
Further, the output soft control positive electrode is connected with a PNP type triode Q2;
the base electrode of the PNP type triode Q2 is connected with the collector electrode of the NPN type triode Q1, the emitting electrode of the PNP type triode Q2 is connected with the positive electrode of the vehicle starting power signal IGN, and the collector electrode of the PNP type triode Q2 serves as the soft control positive electrode.
Further, a resistor R4 is connected between the base and the emitter of the PNP transistor Q2, and a resistor R3 is connected between the base of the PNP transistor Q2 and the collector of the NPN transistor Q1.
The input signal received by the MCU includes: and the MCU outputs the alarm lamp software control output signal.
The beneficial effect of adopting the further scheme is that: the automobile instrument alarm lamp CAN automatically light according to CAN messages or soft control after switching value collection or directly light by hard control of the whole automobile wire harness; during soft control, the synchronous control of the anode and the cathode of the alarm lamp of the instrument can be realized through one I/O port of the MCU, so that chip resources are saved, and the reliability is improved.
Drawings
Fig. 1 is a schematic diagram of a soft-hard double-control and mutually-isolated protection circuit of an automobile instrument alarm lamp according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the utility model.
The automobile instrument needs to be adapted to any mode of lighting according to the CAN message, lighting after switching value acquisition or directly lighting the whole automobile wire harness, and the automobile instrument CAN not be influenced mutually or normally light. Therefore, the utility model solves the problem by designing a soft-hard double-control and mutual isolation protection circuit for the alarm lamp of the automobile instrument, and the soft-hard double-control and mutual isolation protection circuit for the alarm lamp of the automobile instrument, wherein the protection circuit comprises: the alarm lamp comprises an alarm lamp loop, an alarm lamp hard control loop and an alarm lamp soft control loop.
The alarm lamp hard control loop includes: diode D2 and diode D4.
The positive pole of diode D4 is connected with whole car hardwire direct control positive pole, and the negative pole is connected with the positive pole of alarm lamp return circuit.
The positive pole of diode D2 is connected with the negative pole in alarm lamp return circuit, and the negative pole is connected with whole car hard wire direct control negative pole.
The soft control loop of alarm lamp includes: diode D1 and diode D3.
The positive pole of the diode D3 is connected with the soft control positive pole, and the negative pole is connected with the positive pole of the alarm lamp loop.
The positive pole of diode D1 is connected with the negative pole in alarm lamp return circuit, and the negative pole is connected with soft accuse negative pole.
The diode D3 and the diode D4 may be implemented by a face-to-face array diode, and the diode D1 and the diode D2 may be implemented by a back-to-back array diode.
The utility model provides a soft and hard double-control and mutual isolation protection circuit of an automobile instrument alarm lamp, which has the following realization principle:
the alarm lamp hard control loop is directly controlled by a whole vehicle hard wire (switching value): the whole vehicle wiring harness is connected with positive voltage to the positive electrode of the diode D4 (the whole vehicle hard wire direct control positive electrode) (network 8), and is connected with negative electrode or ground to the negative electrode of the diode D2 (the whole vehicle hard wire direct control negative electrode) (network 11), and the alarm lamp is on. Otherwise, it is extinguished.
Soft control of an alarm lamp: when the alarm lamp needs to be lightened, the soft control cathode outputs low level to the cathode of the diode D1 and is connected with the network 3 to the ground; at the same time, the "soft-controlled positive" output voltage is turned on to the positive pole of diode D3 (network 6). Therefore, the anode and the cathode of the alarm lamp are both connected, and the alarm lamp is on. If the instrument determines that the alarm lamp needs to be extinguished, the soft control cathode outputs a high level to the cathode of the diode D1, the soft control anode outputs a low level to the diode D3, and the anode (network 6) of the diode D3 is equal to 0V, so that the alarm lamp is extinguished.
The automobile instrument alarm lamp soft-hard double-control and mutual isolation protection circuit provided by the utility model realizes any mode that the automobile instrument alarm lamp can be turned on through soft control or the whole automobile wire harness can be directly turned on through hard control. The double control circuit of the alarm lamp is isolated by diodes D1, D2, D3 and D4, has the protection functions of preventing positive and negative reverse connection, preventing power reverse series, preventing voltage short circuit and preventing electrical interference, and avoids device failure and poor function. The mass production product is widely applied to the electric environment of the real vehicle, and no failure is found, so that the method is proved to be practical and effective.
Example 1
Embodiment 1 of the present invention is an embodiment of a circuit for a warning lamp of an automobile instrument, which is controlled by soft and hard circuits and isolated from each other, and fig. 1 is a schematic circuit diagram of a circuit for a warning lamp of an automobile instrument, which is controlled by soft and hard circuits and isolated from each other. As can be seen from fig. 1, the embodiment of the protection circuit includes: the alarm lamp comprises an alarm lamp loop, an alarm lamp hard control loop and an alarm lamp soft control loop.
Specifically, this alarm lamp return circuit includes: a light emitting diode LED, a resistor R5 and a resistor R6.
The light emitting diode LED is connected in parallel with the resistor R6 and then connected in series with the resistor 5.
The anode of the LED is connected with the resistor R5 in series and then serves as the anode of the alarm lamp loop, and the cathode of the LED serves as the cathode of the alarm lamp loop.
The alarm lamp hard control loop includes: diode D2 and diode D4.
The positive pole of diode D4 is connected with whole car hardwire direct control positive pole, and the negative pole is connected with the positive pole of alarm lamp return circuit.
The positive pole of diode D2 is connected with the negative pole in alarm lamp return circuit, and the negative pole is connected with whole car hard wire direct control negative pole.
The soft control loop of alarm lamp includes: diode D1, diode D3, microcontroller MCU, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, NPN type triode Q1 and PNP type triode Q2.
The positive pole of the diode D3 is connected with the soft control positive pole, and the negative pole is connected with the positive pole of the alarm lamp loop.
The positive pole of diode D1 is connected with the negative pole in alarm lamp return circuit, and the negative pole is connected with soft accuse negative pole.
Preferably, the soft control negative electrode is connected with an NPN type triode Q1.
The base electrode of the NPN type triode Q1 is connected with an alarm lamp software control output signal, the emitting electrode is grounded, and the collector electrode is connected with the positive electrode of a vehicle starting power supply signal IGN and then serves as a soft control negative electrode.
The base electrode of the NPN type triode Q1 is also connected with an alarm lamp software control output signal through a resistor R1.
A capacitor C1 and a resistor R2 which are connected in parallel are connected between the base electrode and the emitter electrode of the NPN type triode Q1.
The positive electrode of the output soft control is connected with a PNP type triode Q2.
The base electrode of the PNP type triode Q2 is connected with the collector electrode of the NPN type triode Q1, the emitting electrode of the PNP type triode Q2 is connected with the positive electrode of the vehicle starting power supply signal IGN, and the collector electrode of the PNP type triode Q2 serves as a soft control positive electrode.
A resistor R4 is connected between the base electrode and the emitter electrode of the PNP type triode Q2, and a resistor R3 is connected between the base electrode of the PNP type triode Q2 and the collector electrode of the NPN type triode Q1.
Through local adjustment of the circuit, the NPN transistor Q1 and the PNP transistor Q2 can also be controlled by MOS transistors.
The input signals received by the MCU include: and the MCU outputs an alarm lamp software control output signal.
The soft control of the alarm lamp comprises two modes: 1. in the CAN control mode, the instrument controls the alarm lamp to be on or off according to CAN signals. 2. The alarm lamp is driven to be on or off according to the switching value state, the instrument collects and confirms the switching value state, and then the alarm lamp is controlled to be on or off.
The positive pole (network 7), negative pole (network 10) in alarm lamp return circuit receive MCU's output control or whole car hardwire (switching value) direct control two kinds of modes to drive LED bright and go out, specific:
when the MCU determines that the LED needs to be lightened according to the state of the network received by the switching value acquisition in or the CAN bus message of the whole vehicle, the MCU controls the lamp soft control out (network 1) to output high, Q1 to be conducted, and the negative electrode soft control (network 3) of D1 to be connected to the ground; at the same time, Q2 is also turned on, and the vehicle system voltage IGN + (network 5) is turned on to the positive "soft control +" (network 6) of D3. Therefore, the anode and the cathode of the LED are both connected, and the LED lamp is on.
If the instrument determines that the LED needs to be turned off, the MCU controls the soft control out (network 1) output to be low, Q1 and Q2 are both cut off, the voltage of the negative electrode soft control- "(network 3) of D1 is equal to the IGN plus of the whole vehicle, and the voltage of the positive electrode soft control plus (network 6) of D3 is equal to 0V, so that the LED lamp is turned off.
When the alarm lamp is controlled hard, the instrument does not directly control the alarm lamp to be on or off, but is directly driven by the switching value of the whole vehicle.
Based on the isolation circuits of the diodes D1, D2, D3 and D4, the MCU can synchronously and soft control the anode and the cathode of the alarm lamp of the instrument through one I/O port. When the instrument judges that the alarm lamp belongs to a soft control mode and needs to be lightened, the anode and the cathode of the soft control mode of the alarm lamp are turned on, so that the influence of the wiring mode of the whole vehicle habit or the error of wiring is avoided, and the alarm lamp is normally lightened due to the fact that the alarm lamp is electrified by mistake. The LED lamp has the good protection functions of preventing positive and negative reverse connection, reverse power supply series connection, voltage short circuit and electrical interference, and avoids the defects of device failure and poor functions of normally lighting or not lighting the LED.
Positive and negative reverse connection prevention: even if the positive pole of D3 is connected with negative in an abnormal way (network 6) and the positive pole of D4 is connected with direct control plus in a hard line of the whole vehicle (network 8), the negative pole of D1 is connected with positive in a abnormal way (network 3) and the negative pole of D2 is connected with direct control plus in a hard line of the whole vehicle (network 11), the circuit is still intact and is not influenced.
Preventing power supply anti-string: due to the isolation of D1, D2, D3 and D4, one I/O port of the MCU can perform synchronous soft control on the positive electrode and the negative electrode of an instrument alarm lamp, the positive electrode of D3 is 'soft control plus' (network 6) and the positive electrode of D4 is 'finished automobile hard line direct control plus' (network 8) can be in voltage reverse series connection with each other, and the negative electrode of D1 is 'soft control-' (network 3) and the negative electrode of D2 is 'finished automobile hard line direct control-' (network 11) can be in voltage reverse series connection with each other.
Preventing voltage short circuit: because the circuit has the protection of preventing positive and negative reverse connection and preventing reverse series of power supply, even if one of the positive pole 'soft control +' (network 6) of D3 and the positive pole 'whole vehicle hard line direct control +' (network 8) of D4 is connected with the positive, the other one is connected with the negative abnormally, the circuit is not influenced; the negative pole of D1 is controlled by soft control- "(network 3) and the negative pole of D2 is controlled by hard line directly-" (network 11), one is connected with negative, the other is connected with positive, and the circuit is not affected.
Electric interference prevention: due to the isolation of D1, D2, D3 and D4, the synchronous soft control of the positive electrode and the negative electrode of the alarm lamp of the instrument can be realized by one I/O port of the MCU, and the interference of positive and negative spike pulses of the electric environment of the whole vehicle can be effectively inhibited or the influence of wrong wiring harness connection of the whole vehicle is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The utility model provides a two accuse of motormeter alarm lamp softness and hardness and mutual isolation protection circuit which characterized in that, protection circuit includes: the alarm lamp control system comprises an alarm lamp loop, an alarm lamp hard control loop and an alarm lamp soft control loop;
the alarm lamp hard control loop comprises: diode D2 and diode D4;
the anode of the diode D4 is connected with the hard wire direct control anode of the whole vehicle, and the cathode is connected with the anode of the alarm lamp loop;
the anode of the diode D2 is connected with the cathode of the alarm lamp loop, and the cathode is connected with the hard wire direct control cathode of the whole vehicle;
the soft control loop of alarm lamp includes: diode D1 and diode D3;
the anode of the diode D3 is connected with the soft control anode, and the cathode of the diode D3 is connected with the anode of the alarm lamp loop;
the anode of the diode D1 is connected with the cathode of the alarm lamp loop, and the cathode is connected with the soft control cathode.
2. The protection circuit of claim 1, wherein the warning lamp circuit comprises: a Light Emitting Diode (LED), a resistor R5 and a resistor R6;
the LED is connected with the resistor R6 in parallel and then connected with the resistor R5 in series;
the anode of the light emitting diode LED is connected with the resistor R5 in series to be used as the anode of the alarm lamp loop, and the cathode of the light emitting diode LED is used as the cathode of the alarm lamp loop.
3. The protection circuit according to claim 1, wherein the soft-controlled negative electrode is connected with an NPN type triode Q1;
the base electrode of the NPN type triode Q1 is connected with an alarm lamp software control output signal, the emitting electrode is grounded, and the collector electrode is connected with the positive electrode of a vehicle starting power supply signal IGN and then serves as the soft control negative electrode.
4. The protection circuit of claim 3, wherein the base of the NPN transistor Q1 is further connected with an alarm lamp software control output signal through a resistor R1;
and a capacitor C1 and a resistor R2 which are connected in parallel are connected between the base electrode and the emitter electrode of the NPN type triode Q1.
5. The protection circuit according to claim 3, wherein a PNP type triode Q2 is connected to the soft control positive electrode of the output;
the base electrode of the PNP type triode Q2 is connected with the collector electrode of the NPN type triode Q1, the emitting electrode of the PNP type triode Q2 is connected with the positive electrode of the vehicle starting power signal IGN, and the collector electrode of the PNP type triode Q2 serves as the soft control positive electrode.
6. The protection circuit of claim 5, wherein a resistor R4 is connected between the base and the emitter of the PNP transistor Q2, and a resistor R3 is connected between the base of the PNP transistor Q2 and the collector of the NPN transistor Q1.
7. The protection circuit according to any one of claims 3-6, wherein the protection circuit further comprises an MCU;
the input signal received by the MCU includes: and the MCU outputs the alarm lamp software control output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120844083.8U CN215345183U (en) | 2021-04-22 | 2021-04-22 | Soft and hard two accuse of motormeter alarm lamp and mutual isolation protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120844083.8U CN215345183U (en) | 2021-04-22 | 2021-04-22 | Soft and hard two accuse of motormeter alarm lamp and mutual isolation protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN215345183U true CN215345183U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120844083.8U Active CN215345183U (en) | 2021-04-22 | 2021-04-22 | Soft and hard two accuse of motormeter alarm lamp and mutual isolation protection circuit |
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| CN (1) | CN215345183U (en) |
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2021
- 2021-04-22 CN CN202120844083.8U patent/CN215345183U/en active Active
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