CN214674316U

CN214674316U - Multifunctional hard-line output circuit

Info

Publication number: CN214674316U
Application number: CN202120275402.8U
Authority: CN
Inventors: 易勇帆; 黄锐景; 陈志勇; 李用; 文冬
Original assignee: GAC Component Co Ltd
Current assignee: GAC Component Co Ltd
Priority date: 2021-01-29
Filing date: 2021-01-29
Publication date: 2021-11-09
Anticipated expiration: 2031-01-29

Abstract

The utility model provides a multi-functional hard line output circuit, including output circuit, the load overcurrent protection circuit, surge and electrostatic protection circuit and output diagnosis circuit, output circuit includes first triode, first resistance and second resistance, the control port of little the control unit is connected with the base of first triode through first resistance, the power end passes through the second resistance and is connected with the collecting electrode of first triode, the load overcurrent protection circuit is connected with the projecting pole and the base of first triode, surge and electrostatic protection circuit, output diagnosis circuit is connected with the collecting electrode of first triode. The utility model is realized by using the triode, the capacitor and the resistor, and has the advantage of low cost compared with the scheme of driving the chip at a low side; the load overcurrent protection, output diagnosis, surge protection and electrostatic protection functions are added to the existing circuit scheme, the stability of the system is enhanced, and the high-speed intelligent load protection circuit has a wide market value under the trend of high intelligence.

Description

Multifunctional hard-line output circuit

Technical Field

The utility model relates to a hard-line output circuit technical field especially relates to a multi-functional hard-line output circuit.

Background

The automobile is developed from a traditional fuel automobile to an electric automobile at a high speed, and the electric automobile is characterized by intellectualization without leaving controllers of all parts of an automobile body. The vehicle body control system mostly adopts a 12V or 24V voltage system, and a processor in the controller generates low-voltage and weak-current signals of 3.3V or 5V. Therefore, it is necessary to design a circuit to convert the weak current signal into an electrical signal of 12V or 24V of the vehicle body system.

These signals may be I/O signals or may be PWM signals. We call this converted part of the circuit the driver circuit. In practical application, a plurality of hard-line output circuits with the function are provided, but the hard-line output circuits do not have the functions of load overcurrent protection, output diagnosis, surge protection and electrostatic protection. Some of the driving chips are used to implement this function, and the driving IC scheme is relatively costly.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a multifunctional hard wire output circuit uses triode, electric capacity and resistance to realize, has increased load overcurrent protection, output diagnosis, surge protection and electrostatic protection function on current circuit scheme, has strengthened the stability of system, and is with low costs, under the trend of high intellectuality, has wide market value.

The utility model provides a multi-functional hard line output circuit, including output circuit, load overcurrent protection circuit, surge and electrostatic protection circuit and output diagnostic circuit, output circuit includes first triode, first resistance and second resistance, and the control port of little the control unit passes through first resistance with the base of first triode is connected, and the power end passes through the second resistance with the collecting electrode of first triode is connected, the load overcurrent protection circuit with the projecting pole and the base of first triode are connected, surge and electrostatic protection circuit output diagnostic circuit with the collecting electrode of first triode is connected.

Furthermore, the load overcurrent protection circuit comprises a second triode and a third resistor, wherein an emitter of the first triode is grounded through the third resistor, a base of the second triode is connected between the emitter of the first triode and the third resistor, a collector of the second triode is connected with the base of the first triode, and the emitter of the second triode is grounded.

Further, the surge and electrostatic protection circuit comprises a transient suppression diode, the cathode of the transient suppression diode is connected between the collector of the first triode and the second resistor, and the anode of the transient suppression diode is grounded.

Further, the output diagnosis circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor and an AD acquisition port, wherein the fourth resistor and the fifth resistor are connected in series, the fourth resistor is connected between the collector of the first triode and the second resistor, the fifth resistor is grounded, one end of the sixth resistor is connected between the fourth resistor and the fifth resistor, the other end of the sixth resistor is connected with the AD acquisition port, and one end of the first capacitor is connected between the sixth resistor and the AD acquisition port, and the other end of the first capacitor is grounded.

Furthermore, the output circuit further comprises a seventh resistor and a second capacitor, the seventh resistor and the second capacitor are connected between the base and the emitter of the first triode, and the seventh resistor is located between the second capacitor and the second triode.

Further, the first triode and the second triode are NPN type triodes.

Further, the transient suppression diode is a unidirectional transient suppression diode.

Furthermore, the filter circuit comprises a filter capacitor, one end of the filter capacitor is connected with the collector electrode of the first triode, and the other end of the filter capacitor is grounded.

Further, the one-way transient suppression diode adopts a transient suppression diode of an AQ24-02HTG model.

Compared with the prior art, the beneficial effects of the utility model reside in that:

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings. The detailed description of the present invention is given by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic diagram of a multifunctional hard-wired output circuit of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

A multifunctional hard-wired output circuit can be used on an electronic gear shifter and also can be used on a system of 5V to 12V or 24V, and the signals can be I/O signals or PWM signals. As shown in fig. 1, the micro-control unit comprises an output circuit, a load overcurrent protection circuit, a surge and electrostatic protection circuit and an output diagnosis circuit, wherein the output circuit comprises a first triode Q1, a first resistor R3 and a second resistor R1, a control port MCU _ POS _ P _ SW of the micro-control unit is connected with a base of the first triode Q1 through the first resistor R3, a power supply terminal BAT _ b is connected with a collector of the first triode Q1 through the second resistor R1, the load overcurrent protection circuit is connected with an emitter and a base of the first triode Q1, and the surge and electrostatic protection circuit and the output diagnosis circuit are connected with a collector of the first triode Q1.

As shown in fig. 1, the load over-current protection circuit includes a second transistor Q2 and a third resistor R6, an emitter of the first transistor Q1 is grounded via the third resistor R6, a base of the second transistor Q2 is connected between the emitter of the first transistor Q1 and the third resistor R6, a collector of the second transistor Q2 is connected to the base of the first transistor Q1, and an emitter of the second transistor Q2 is grounded.

The output circuit further comprises a seventh resistor R5 and a second capacitor C2, the seventh resistor R5 and the second capacitor C2 are connected between the base and the emitter of the first triode Q1, and the seventh resistor R5 is located between the second capacitor C2 and the second triode Q2. Preferably, the first triode and the second triode are NPN type triodes. When the MCU _ POS _ P _ SW outputs a high level, the Q1 is turned on, the front base voltage is 4.5V, the Q1 is turned on, the POS _ P _ SW is connected to GND through the first triode Q1 and the third resistor R6, the POS _ P _ SW voltage is about 0.2V, and the POS _ P _ SW outputs a low level. When the MCU _ POS _ P _ SW outputs a low level, the first transistor Q1 is turned off, and the POS _ P _ SW is at a high level.

Q1 is conducted, when POS _ P _ SW is short-circuited to a 12V power supply, the 12V power supply is connected to GND through a first triode Q1 and a third resistor R6 to form a loop, the current flowing through the loop is rapidly increased, the current is increased, meanwhile, the voltage of the base electrode of a second triode Q2 is greater than 0.7V, Q2 is conducted, the voltage of the collector of Q1 is about 0.2V (the voltage drop of the collector electrode and the emitter electrode of a second triode Q2), the voltage of the collector of Q1 is about 0.2V, Q1 is cut off, and the damage of Q1 is avoided. When the short circuit of POS _ P _ SW 12V is recovered (the short circuit is removed), POS _ P _ SW can output normally.

The surge and electrostatic protection circuit includes a Transient Voltage Suppressor (TVS). Preferably, the transient suppression diode is a unidirectional transient suppression diode. In this example, a model AQ24-02HTG transient suppression diode was used. The cathode of the transient suppression diode (pin 1 of TVS in fig. 1) is connected between the collector of the first transistor Q1 and the second resistor R1, and the anode of the transient suppression diode (pin 3 of TVS in fig. 1) is grounded. An AQ24-02HTG model TVS is added at the output end, and the TVS has a surge protection function and an electrostatic protection function.

The output diagnosis circuit comprises a fourth resistor R2, a fifth resistor R7, a sixth resistor R4, a first capacitor C3, an AD acquisition port MCU _ POS _ P _ SW _ AD, the fourth resistor R2 is connected with a fifth resistor R7 in series, the fourth resistor R4 is connected between the collector of the first triode Q1 and the second resistor R1, the fifth resistor R7 is grounded, one end of the sixth resistor R4 is connected between the fourth resistor R2 and the fifth resistor R7, the other end of the sixth resistor R4 is connected with the AD acquisition port MCU _ POS _ P _ SW _ AD, one end of the first capacitor C3 is connected between the sixth resistor R4 and the AD acquisition port MCU _ POS _ P _ SW _ AD, and the other end of the first capacitor C3 is grounded. An AD acquisition port is added at the output end, so that the module output can be diagnosed, and the diagnosis judgment method is as follows.

When the MCU terminal MCU _ POS _ P _ SW outputs high level, normal output and short circuit are carried out to the cathode of the power supply, the voltage of the port MCU _ POS _ P _ SW _ AD for diagnosis and collection is about 0V, and although the collected voltage is the same, the system can still work normally at the moment. When the MCU terminal MCU _ POS _ P _ SW outputs low level, the fault of the short circuit to the negative electrode of the power supply can still be diagnosed.

When the MCU terminal MCU _ POS _ P _ SW outputs a low level, normal output and short circuit are carried out to the anode of the power supply, the voltage of the port MCU _ POS _ P _ SW _ AD for diagnosis and collection is about 2V, and although the collected voltage is the same, the system can still work normally at the moment. When the MCU terminal MCU _ POS _ P _ SW outputs high level, the fault of the short circuit to the negative electrode of the power supply can still be diagnosed.

As shown in fig. 1, the transistor further includes a filter circuit, the filter circuit includes a filter capacitor C1, one end of the filter capacitor C1 is connected to the collector of the first transistor Q1, and the other end is grounded.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the utility model can be smoothly implemented by the ordinary technicians in the industry according to the drawings and the above description; however, those skilled in the art should understand that changes, modifications and variations made by the above-described technology can be made without departing from the scope of the present invention, and all such changes, modifications and variations are equivalent embodiments of the present invention; meanwhile, any changes, modifications, evolutions, etc. of the above embodiments, which are equivalent to the actual techniques of the present invention, still belong to the protection scope of the technical solution of the present invention.

Claims

1. A multifunctional hard-wired output circuit is characterized in that: the load overcurrent protection circuit is connected with an emitting electrode and a base electrode of the first triode, the surge and electrostatic protection circuit and the output diagnosis circuit are connected with a collecting electrode of the first triode.

2. The multifunctional hardwired output circuit of claim 1, wherein: the load overcurrent protection circuit comprises a second triode and a third resistor, wherein an emitting electrode of the first triode is grounded through the third resistor, a base electrode of the second triode is connected between the emitting electrode of the first triode and the third resistor, a collector electrode of the second triode is connected with the base electrode of the first triode, and the emitting electrode of the second triode is grounded.

3. The multifunctional hardwired output circuit of claim 1, wherein: the surge and electrostatic protection circuit comprises a transient suppression diode, the negative electrode of the transient suppression diode is connected between the collector of the first triode and the second resistor, and the positive electrode of the transient suppression diode is grounded.

4. The multifunctional hardwired output circuit of claim 1, wherein: the output diagnosis circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor and an AD acquisition port, wherein the fourth resistor is connected with the fifth resistor in series, the fourth resistor is connected with the collector of the first triode and between the second resistors, the fifth resistor is grounded, one end of the sixth resistor is connected with the fourth resistor and between the fifth resistor, the other end of the sixth resistor is connected with the AD acquisition port, one end of the first capacitor is connected with the sixth resistor and between the AD acquisition ports, and the other end of the first capacitor is grounded.

5. The multifunctional hardwired output circuit of claim 2, wherein: the output circuit further comprises a seventh resistor and a second capacitor, the seventh resistor and the second capacitor are connected between the base electrode and the emitter electrode of the first triode, and the seventh resistor is located between the second capacitor and the second triode.

6. The multifunctional hardwired output circuit of claim 2, wherein: the first triode and the second triode are NPN type triodes.

7. A multifunctional hardwired output circuit as in claim 3, wherein: the transient suppression diode is a unidirectional transient suppression diode.

8. The multifunctional hardwired output circuit of claim 1, wherein: the filter circuit comprises a filter capacitor, one end of the filter capacitor is connected with the collector of the first triode, and the other end of the filter capacitor is grounded.

9. The multifunctional hardwired output circuit of claim 7, wherein: the one-way transient suppression diode adopts a transient suppression diode of an AQ24-02HTG model.