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On-board control unit power supply anti-reverse connection and power-off post-processing circuit

A power supply anti-reverse connection and control unit technology, which is applied to circuits or fluid pipelines, vehicle components, transportation and packaging, etc., can solve problems such as inability to perform action protection, failure of control unit functions, and unfavorable active control of the power supply system. Improve reliability and maintainability, good effect of reverse polarity protection

Active Publication Date: 2017-11-14
CHINA NORTH VEHICLE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large thermal resistance of the diode itself, high conduction voltage, and small package, the power of the power supply system is limited to a certain extent; at the same time, the diode cannot control its turn-on and turn-off time, which is a passive form, which is not conducive to the power supply system. active control of
[0004] In addition, when the traditional on-board control unit is turned to the OFF gear, the control unit will immediately cut off the power, causing the function of the control unit to fail immediately, and effective action protection cannot be performed, such as key data storage before power failure, and related loads cannot Back to the starting working position, etc., which is not conducive to the maintenance of the vehicle

Method used

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  • On-board control unit power supply anti-reverse connection and power-off post-processing circuit

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Embodiment Construction

[0021] In order to make the purpose, content, and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] Such as figure 1 As shown, the embodiment of the present invention provides a vehicle-mounted control unit (ECU) power supply anti-reverse connection and power-failure post-processing circuit, including an anti-reverse connection module, a surge suppression module, a control and power-failure post-processing module, and a signal isolation Module Four modules. The post-stage power supply circuit and MCU indicated by the dotted line box are not part of the circuit.

[0023] The surge suppression module mainly realizes the suppression and discharge function of the power surge of the control unit. According to the requirements of the civilian vehicle standard ISO7637 on the power supply system, the present inventio...

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Abstract

The invention relates to a reverse-connection-preventing and power-off post-processing circuit for a vehicle-mounted control unit power supply and belongs to the technical field of electronic control of vehicles. According to the circuit, reverse-connection-prevention and controllable connection and disconnection of a power supply system are realized by a pair of symmetrically mounted PMOSFETs (p-type metal oxide semiconductor field effect transistors); power-off detection and power-off post-processing for the power supply system are realized by a pair of triode switch circuits; surge suppression for the power supply system is realized by a pair of TVSs (transient voltage suppressors) connected in series. The processing and practice prove that by means of the circuit, the reverse connection protection, the surge suppression and the power-off post-processing for the power supply system can be realized very well, and reliability and maintainability of the power supply system are improved.

Description

technical field [0001] The invention relates to the technical field of vehicle electronic control, in particular to a power supply anti-reverse connection and power-off post-processing circuit of a vehicle-mounted control unit. Background technique [0002] With the rapid development of vehicle electronic technology, more and more on-board control units are applied to vehicles to assist the realization of various tasks of the vehicle, such as power transmission control, vehicle chassis control and body electronic control, etc. plays an important role in vehicle reliability. In order to improve the reliability of the on-board control unit, the first task is to improve the robustness of its power supply function. Due to the complex and changeable characteristics of the vehicle power grid and the different characteristics of the vehicle load, the vehicle power grid inevitably has spikes, surges, and reverse connections. This puts forward higher requirements for the reliability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60R16/023
CPCB60R16/0231
Inventor 李艳明高峰倪永亮李申王道灿蒋任君王美靖纪超乔风普
Owner CHINA NORTH VEHICLE RES INST
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