On-line detection method of solid-state power switch

Abstract

The invention relates to an on-line detection method of a solid-state power switch. A device of the detection method comprises a control center, a microprocessor, a drive circuit, a sample circuit, a power supply, the solid-state power switch and an electrical load. The detection method is characterized in that the control center is used for issuing a detection order to the microprocessor; an internal timer in the microprocessor generates an instantaneous switching signal; the drive circuit applies a corresponding turn-on signal to the solid-state power switch; the power supply injects an instantaneous electric energy to the electrical load through the solid-state power switch; current or voltage on a load loop is detected through the sample circuit and output to an analog-to-digital sample port of the microprocessor; the voltage and the current of the load loop or voltage drops on the solid-state power switch within the open moment are obtained so as to judge whether the solid-state power switch can work normally or not. The detection method detects the current and the voltage of the load loop by instantaneously turning on and off the power control switch so as to achieve the purpose of detecting the power control switch in an on-line mode.

Description

technical field [0001] The invention is a detection method of a solid-state power switch, which can be used in electromechanical control systems and solid-state power controllers. Background technique [0002] In the current electromechanical control system and solid-state power controller, the power control switch generally adopts a mechanical electromagnetic relay, a circuit breaker, or a solid-state power switch such as a thyristor SCR (Silicon ControlledRectifier), a metal oxide field effect transistor MOSFET (Metal -Oxide Semiconductor FieldEffect Transistor), turn-off thyristor GTO (Gate Turn-Off Thyristor), insulated gate bipolar transistor IGBT (Insulated Gate Bipolar Transistor), solid-state relay SSR (Solid-StateRelay). In the field control system, since these power control switches are directly connected to the power source and the electrical load, most systems generally do not allow the electrical load to be loaded and run when the electrical load is in an abnorm...

AI Technical Summary

Problems solved by technology

Off-line detection methods can no longer meet the needs of intelligent control systems, and a key link is missing in fault prevention and system health diagnosis

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