Integrated anti-reverse-connection and high-side switching circuit and controller

Abstract

The embodiment of the invention provides an integrated anti-reverse-connection and high-side switching circuit and a controller. The integrated anti-reverse-connection and high-side switching circuit comprises a high-side driving unit, a power supply unit, a reverse-connection protection unit, a single-chip microcomputer unit and an enabling control unit. The high-side driving unit is electrically connected with the high-side load and is used for supplying power to the high-side load; the power supply unit is electrically connected with the high-side driving unit and supplies power to the high-side driving unit; the reverse-connection protection unit is electrically connected with the power supply unit to prevent the controller from being damaged by reverse connection of the power supply unit; the single-chip microcomputer unit is electrically connected with the enabling control unit and is used for sending a high-side enabling signal to the enabling control unit; and the enabling control unit is electrically connected with the high-side driving unit and is used for processing the high-side enabling signal and then sending the processed high-side enabling signal to the high-side driving unit. The integrated circuit has two functions of reverse connection prevention and high-side driving, the production cost is reduced, the occupied space of the circuit is reduced, and the stability of the circuit is improved.

Description

technical field [0001] The invention relates to the technical field of controllers, in particular to an integrated anti-reverse connection and high-side switch circuit and a controller. Background technique [0002] At present, in the development and design of automotive products, the requirements for the electronic control system are getting higher and higher, especially for the electrical diagnosis of the actuator, the driving current capability of the actuator, the driving frequency, and the reverse connection protection of the controller power supply. Among them, In the design of the controller, the driving function of the main relay needs to be integrated into the printed circuit board (Printed Circuit Board, PCB). output capacity. [0003] In the design of the controller, in view of the working environment temperature of the automotive controller, if the design of the high-side switch does not consider the heat generation of its power devices, it is easy to cause seve...

AI Technical Summary

Problems solved by technology

However, the circuit design of reverse connection MOS tube adopts PMOS tube, the design of the reverse connection circuit of PMOS tube is simple, it is only suitable for small current circuit, when the drive current of the controller is too large, the internal resistance of the PMOS tube is too large, and the power consumption is large , will lead to serious self-heating, and the cost of the PMOS tube itself is relatively high, which greatly increases the design cost of the controller

At the same time, in the prior art, the design idea of ​​the high-side drive circuit is complicated, and it is necessary to specially design and use the power supply and filter circuit for the single-chip microcomputer, which further increases the cost, reduces the space utilization rate, and cannot realize circuit integration.

In addition, using a DCDC circuit to power the microcontroller, the noise interference generated by the DCDC charge pump circuit is large, which will have a certain impact on the normal function of the circuit.

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