Power element fault detection method and circuit

Abstract

The embodiment of the invention discloses a power element fault detection method and a power element fault detection circuit. The method is applied to the power element fault detection circuit. The circuit comprises a first resistor element, a first diode, a second diode, a second resistor element, a first power element and a second power element, wherein the first end of the first resistor element is connected with a power supply, the voltage value of the power supply is a first voltage value, and the voltage of the positive electrode of the second diode is a second voltage value; the methodcomprises the steps of determining a third voltage value between the source electrode of the first power element and the source electrode of the second power element based on the first voltage value and the second voltage value; and determining the fault state of the first power element and / or the second power element based on the driving state of the first power element, the driving state of thesecond power element and the third voltage value.

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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