Fault detection method and circuit of a power component

Abstract

The embodiment of the present application discloses a fault detection method of a power element and a fault detection circuit of a power element. The method is applied to a fault detection circuit of a power element, and the circuit includes: a first resistance element, a first diode, The second diode, the second resistance element, the first power element, and the second power element; wherein, the first end of the first resistance element is connected to a power supply, and the voltage value of the power supply is a first voltage value, so The voltage of the anode of the second diode is a second voltage value; the method includes: determining the source of the first power element and the second voltage based on the first voltage value and the second voltage value a third voltage value between the sources of the power element; determining the first power element and / or based on the driving state of the first power element, the driving state of the second power element and the third voltage value A fault state of the second power element.

Description

technical field [0001] The embodiments of the present application relate to the field of circuits, and in particular, to a fault detection method and circuit for power components. Background technique [0002] The battery management system (BMS, Battery Management System) is one of the core components of the power battery. It has high safety requirements during use. The BMS system includes a power circuit composed of power switches, and when using the BMS, it usually needs To detect the failure of the power switch, the conventional method is usually to determine the failure of the power switch by detecting the driving voltage of the power switch, but this method generally only detects the fault between the gate (ie, G pole) and the source (ie, S pole). The fault in the breakdown state between the G pole and the S pole cannot be detected, and the fault of the impedance between the G pole and the S pole is abnormal but the impedance is high, and the fault detection of the open...

AI Technical Summary

Problems solved by technology

[0002] The battery management system (BMS, Battery Management System) is one of the core components of the power battery. It has high safety requirements during use. The BMS system includes a power circuit composed of power switches, and when using the BMS, it usually needs To detect the failure of the power switch, the conventional method is usually to determine the failure of the power switch by detecting the driving voltage of the power switch, but this method generally only detects the fault between the gate (ie, G pole) and the source (ie, S pole). The fault in the breakdown state between the G pole and the S pole cannot be detected, and the fault of the impedance between the G pole and the S pole is abnormal but the impedance is high, and the fault detection of the open circuit state between the drain (ie D pole) and the S pole cannot be realized.

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