Multipath power supply detection method and circuit

Abstract

The present invention discloses a multipath power supply detection method and circuit The method comprises the steps of: difference sampling of voltages of a multipath power supply through a pluralityof difference sampling circuits, and obtaining a plurality of sampling voltage values, wherein the difference sampling circuits are in one-to-one correspondence with the multipath power supply; determining whether one voltage of each power supply exceeds a preset voltage range or not according to determination of whether each sampling voltage exceeds the corresponding sampling voltage range or not, and obtaining a plurality of determination results; and determining whether there is a power supply exceeds a preset voltage range or not in the multipath power supply according to the determination results. The technical problem is solved that a detection circuit configured to detect not common-ground is high in cost in the prior art.

Description

technical field [0001] The invention relates to the field of detection circuits, in particular to a detection method and circuit for multi-channel power supplies. Background technique [0002] In some cases, multiple power supplies cannot share a common ground. Taking the Insulated Gate Bipolar Transistor (IGBT) module as an example, the IGBT module is a module that integrates and packages multiple IGBT single tubes together. In the field of motor control, an IGBT module integrating six IGBT single tubes is often used as an inverter unit to convert energy. Such an IGBT module needs to use four gate drive power supplies, and these four power supplies cannot be shared. ground, otherwise it will burn the drive circuit and damage the IGBT module. The quality of the gate drive power will affect the performance of the IGBT module. Too high or too low a drive power voltage may damage the IGBT module. When the gate drive power supply is overvoltage and the drive optocoupler receiv...

AI Technical Summary

Problems solved by technology

Using the isolation device solution will increase the cost of the product, and only detecting one drive power supply cannot fully understand the working status of the IGBT, and cannot protect the IGBT module in a timely and effective manner

[0003] Aiming at the technical problem of the high cost of the detection circuit used to detect the power supply that does not share the same ground in the related art, no effective solution has been proposed so far

Images