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Single low-end controlled load drive circuit for vehicles

A technology of load drive circuit and vehicle power supply, which is applied in the direction of general control system, program control, computer control, etc., can solve problems such as fault-free diagnosis and hardware protection, and achieve the effects of average cost reduction, fast output response, and precise control

Active Publication Date: 2020-01-14
LIANCHUANG AUTOMOBILE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solution can only realize the control function of the drive output, without specific fault diagnosis and hardware protection functions

Method used

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  • Single low-end controlled load drive circuit for vehicles
  • Single low-end controlled load drive circuit for vehicles
  • Single low-end controlled load drive circuit for vehicles

Examples

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Embodiment Construction

[0045] Such as figure 1 As shown, the present invention provides a vehicle unit capable of diagnosing load faults at least including: low-side short circuit to power supply fault STB, low-side short circuit to ground fault STG and open circuit fault OP, and can turn off the load drive output when judging the fault Low-side controlled load drive circuit, including:

[0046] MCU U1, overcurrent protection switching device U2, first to fourth resistors R1, R2, R3, R4, first diode D1 and second diode D2; wherein, the second diode D2 is a Schottky Diode, overcurrent protection switch device U2 is a Smart switch.

[0047] The first general-purpose input and output port GPI01 of the MCU U1 is connected to the MCU power supply VCC through the second diode D2, and connected to the first end of the fourth resistor R4 through the first resistor R1;

[0048] The drive input control signal port ANx of the MCU U1 is grounded through the second resistor R2, and connected to the first end o...

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Abstract

The invention discloses a vehicle-used single low side-controlled load driving circuit. The first general input and output port of an MCU is connected with an MCU power supply through a second diode and is connected with the first end of a fourth resistor through a first resistor; the driving input control signal port of the MCU is grounded through a second resistor and is connected with the first end of the fourth resistor through a third resistor; the second general input and output port of the MCU is connected with the first end of an overcurrent protection switch device, the second end of the overcurrent protection switch device is connected with the first end of the fourth resistor, and the third end of the overcurrent protection switch device is grounded; and the first end of the fourth resistor is connected with a vehicle-mounted power supply through a load, and the second end of the fourth resistor is connected with the vehicle-mounted power supply. The vehicle-used single low side-controlled load driving circuit can be applied to output control on a vehicle electronic single low side driving load and can be applied to high-current and high-power consumption driving working conditions, diagnosis on load driving fault can be realized, and the production cost of the single low side-controlled load driving circuit is reduced.

Description

technical field [0001] The invention relates to the technical field of automotive electronics, in particular to a single low-end controlled load drive circuit for vehicles. Background technique [0002] With the continuous improvement of the safety, comfort and emission treatment requirements of modern vehicles, the application of automotive electronic technology is becoming more and more extensive, such as electronic fuel injection control of engine fuel, automatic start-stop control, electric power steering control, commercial vehicle SCR Exhaust gas treatment control, etc. [0003] In all kinds of automotive electronic technology applications, regardless of driving resistive or inductive loads, the demand for single low-end control is becoming more and more common, such as relay drive, oil pump solenoid valve drive, instrument panel indicator light drive, etc. At present, the realization of such The required solutions are: [0004] 1) MCU + low-side pre-driver chip (exc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/24082
Inventor 阙发松
Owner LIANCHUANG AUTOMOBILE ELECTRONICS
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