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Automotive solid-state relay with NMOS tube and over-current protection

A solid-state relay and overcurrent protection circuit technology, applied in electrical components, electronic switches, pulse technology, etc., can solve problems such as hindering the popularization and use of solid-state relays, high cost, and complex circuit redundancy.

Active Publication Date: 2018-01-23
SHANGHAI HUGONG AUTO ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In practice, if the existing solid-state relays are used for automotive control switches, the circuit redundancy is complicated and the cost is too high, which hinders the promotion and use of solid-state relays using MOSFETs in automobiles

Method used

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  • Automotive solid-state relay with NMOS tube and over-current protection
  • Automotive solid-state relay with NMOS tube and over-current protection

Examples

Experimental program
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Embodiment Construction

[0021] Such as figure 1 As shown, since N-channel MOS transistors are usually only suitable for low-side drive, a boost circuit is required if high-side drive is required. When the coil_VCC (solid state relay control terminal power supply) is powered on, the MOS tube control circuit is driven to work through the boost circuit to turn on the MOS tube Q1 and output normally.

[0022] When the switch S1 is turned on, the output load increases instantly, and the MOS tube is in the overcurrent stage. The overcurrent protection circuit uses the RDS of the MOS tube itself (the on-resistance of the MOS tube, usually several milliohms to hundreds of milliohms) in the case of overcurrent voltage drop, when the current reaches a certain threshold, the trigger protection circuit turns off the MOS The tube control circuit turns off the MOS tube to realize the overcurrent protection of the MOS tube Q1. This switch S1 is used to simulate an overcurrent situation. The conduction of S1 can b...

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Abstract

The invention provides an automotive solid-state relay with an NMOS tube and over-current protection. The drain of the NMOS tube is connected with the positive electrode of a vehicle power supply. Thesource is connected with a load. The gate is connected with a boost circuit. The solid-state relay further comprises an MOS tube control circuit connected with the boost circuit. The MOS tube controlcircuit is powered by a solid-state relay control end power supply. The solid-state relay further comprises an over-current protection circuit connected with the MOS tube control circuit. The over-current protection circuit and the NMOS tube are connected in parallel on the drain and the source. After the solid-state relay control end power supply is powered on, the MOS tube control circuit drives the NMOS tube to turn on through the boost circuit. According to the over-current protection circuit, when the NMOS tube is in the over-current condition, the voltage drop of the on-resistance of the NMOS tube in the case of over-current is detected; when the overload current is greater than a threshold, the MOS tube control circuit is turned off; the NMOS tube is turned off to realize over-current protection of the NMOS tube.

Description

technical field [0001] The invention belongs to the technical field of automotive electronics, and in particular relates to an automotive solid-state relay including an NMOS tube with overcurrent protection. Background technique [0002] It is a common technology to use electromagnetic relays as switch control on existing cars. However, due to the limitation of the service life of mechanical materials and structures themselves, in the whole life cycle of vehicles, electromagnetic relays fail and have to be replaced. It is inevitable. At the same time, the sound made by the electromagnetic relay when it is pulled in is also unwelcome for some high-end cars. In this regard, solid state relays have unique advantages. [0003] The patent application with the application number CN200410041985.9 discloses a "DC solid-state power control method, which is characterized in that: the computer sends out a digital control signal for "turning on" or "turning off", and the digital contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/082H03K17/687
Inventor 李万霞郑轶民王瑞陈炳林
Owner SHANGHAI HUGONG AUTO ELECTRIC
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