Power tube grid drive circuit and segment drive method

Abstract

The invention provides a power tube grid drive circuit and a segmented drive method, the circuit includes: a pre-drive stage, used to control the rise time and fall time of the drive signal, so as to initially turn on or turn off the insulated gate power switching device; the output voltage The comparison unit is used to output the switch control signal after comparing the drive signal voltage output by the pre-driver stage with the set threshold value; the three-state compensation drive stage is used for enabling the switch control signal and the output Under the action of the switch control signal output by the voltage comparison unit, the drive output port is compensated for charging or discharging, and the drive output port is pulled up or pulled down at an accelerated rate, so as to fully turn on or turn off the insulated gate power switching device. The driving circuit has a simple structure, does not require resistors and capacitors, reduces the layout area, and has the advantages of little influence on the charging and discharging speed of the grid due to capacitive load changes, high efficiency, safety and reliability, and the like. The segmented driving method can effectively and reliably reduce EMI.

Description

technical field [0001] The invention relates to the field of integrated circuits and control methods thereof, in particular to a power tube grid drive circuit and a segmented drive method. Background technique [0002] In the field of integrated circuit design, especially in the design of power management systems, gate drive loss has become a major factor that restricts the further improvement of system efficiency. EMI can be effectively reduced by controlling the switching mode of insulated gate power devices. Especially in the power management integrated circuit system, the insulated gate power device is often selected as the power switch, and the gate drive module unit of the insulated gate power switch device is indispensable. High-efficiency, low-cost, and low-EMI design are the keys to this type of gate driver cell design. In the existing gate drive circuit, a certain switch dead time is often set to achieve high efficiency, improve the gate charge and discharge effec...

AI Technical Summary

Problems solved by technology

[0009] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a power tube gate drive circuit and a segmented drive method, which are used to solve the problem of using resistors, capacitors and other devices to achieve delay effects in the prior art, and the chip area occupied Large, and due to the large variation range of the capacitive load, the consistency of the EMI reduction effect is poor

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