Intelligent low-side power switch with PHM (Prognostic Health Management) function and capable of being configured in parallel

Abstract

The invention belongs to the field of integrated circuit design, and relates to an intelligent low-side power switch with a PHM (Prognostic Health Management) function and capable of being configuredin parallel. The intelligent low-side power switch comprises an N-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor), and is characterized by further comprising a charge pump for driving the N-channel MOSFET, a current sharing detection and control circuit, an operation mode control / failure state register and a control logic circuit. The intelligent low-side power switch with the PHM function and capable of being configured in parallel is realized through combining a low-side power switch technology, an overcurrent, overvoltage and overheat protection technology, a serial communication technology and a load current sharing technology by the means of an integrated circuit. The intelligent low-side power switch realizes perfect protection for power devices, obtains the faultmode and information, provides information for PHM, performs online configuration in allusion to different loads and provides a technical means and physical basis for an adaptive interface and an intelligent remote interface unit.

Description

Technical field [0001] The invention belongs to the field of integrated circuit design, and relates to a parallel-configurable intelligent low-side power switch with fault prediction and health management (PHM) functions. Background technique [0002] In the environment of aircraft bomb loading, there are many loads such as motors, valves and other equipment that need to be opened and closed through low-side power switches. The current mainstream method is to select power devices with corresponding parameters according to the size of the load, and control N-channel MOSFETs through a computer , Relay or contactor to achieve the main function, and auxiliary over-voltage and over-current protection circuit for protection, but this realization method requires many components, takes up a large board area, is not reliable, cannot achieve overheat protection, and fails At this time, the control computer cannot obtain the failure mode, and cannot realize the configurable parallel use of ...

AI Technical Summary

Problems solved by technology

[0002] In the aircraft-borne environment, there are many loads such as motors, valves and other equipment that need to be turned on and off through low-side power switches. The current mainstream method is to select power devices with corresponding parameters according to the size of the load, and control the N-channel MOSFET through the computer. , relays or contactors to achieve the main function, supplemented by overvoltage and overcurrent protection circuits for protection, but this implementation requires many components, occupies a large board area, and has low reliability. Overheat protection cannot be realized, and failures occur At the same time, the control computer cannot obtain the failure mode, and the configurable parallel use of power output devices cannot be realized.

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