Circuit, for limiting high-side floating power supply low level undershoot, in floating gate drive chip

Abstract

The invention discloses a circuit, for limiting high-side floating power supply low level undershoot, in a floating gate drive chip. The floating gate drive chip comprises a high-side channel and a low-side channel, wherein a logic circuit and a drive circuit are disposed in the high-side channel and a logic circuit and a drive circuit are disposed in the low-side channel. The drive circuit in the conventional high-side channel is modified, a current detecting and control circuit is added between the modified drive circuit and a high-side floating power supply low level VS, one input end of the modified drive circuit is connected with an output end of the logic circuit, an output end of the current detecting and control circuit is connected with the other input end of the modified drive circuit, and an output end of the modified drive circuit is connected with a high-side output pin of the floating gate drive chip.

Description

technical field [0001] The invention relates to a floating gate drive chip, in particular to a circuit for suppressing low-level negative overshoot of a high-side floating power supply in the floating gate drive chip, and belongs to the field of high-voltage integrated circuit (HVIC) design. Background technique [0002] As an advanced high-voltage power switching device drive scheme, floating gate driver chips, as a structure in high-voltage integrated circuits (HVIC), are widely used in motor drives, inverters, switching power supplies, automotive electronics, lighting and other fields, and in daily life. and industrial development are closely linked. figure 1 Shown is the basic structure of the floating gate driver chip and external devices in the prior art. Its function is to use two channels of high and low sides to drive the high-voltage power switching devices with high power level and low side outside the chip (the upper and lower series in the figure Connected IGBT...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the existing high-side floating power low-level VS negative overshoot problem in the existing high-voltage integrated circuit (HVIC), and to provide a floating gate driver chip that suppresses the low-level negative overshoot of the high-side floating power supply. Chong circuit, the circuit involved is simple in structure and high in reliability

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