A switch tube drive circuit applied to program-controlled DC power supply

Abstract

The invention discloses a switch tube drive circuit applied to a programmable DC power supply, the switch tube drive circuit comprises a transformer, a first drive branch and a second drive branch, wherein the first drive branch and the second drive branch are respectively connected with the high potential input end and the low potential input end on primary side of the transformer. Each of the first drive branch and the second drive branch comprises a drive amplification and bootstrap circuit, a blocking and coupling circuit, an acceleration delay circuit, a grid resistance switching circuit and a switching arm circuit. According to the invention, influenced problems including the mutual connection of the switch tubes, switch ringing and the like when the switch tube drives are solved, the circuit can be widely applied to power supply switching, especially in the instrument and equipment with higher requirements than the others, such as the programmable AC power supply, the programmable DC power supply and the like.

Description

technical field [0001] The invention relates to the technical field of program-controlled DC power switch tube drive, in particular to a switch tube drive circuit applied to program-controlled DC power supply. Background technique [0002] Program-controlled power supplies are increasingly used in automatic testing or systems in aerospace, national defense, communications and other industries. Miniaturization and high power density development. Therefore, the research on the power conversion of the program-controlled DC power supply, especially the research on the switching tube drive circuit and method is particularly important. [0003] The working state of the switching tube of the program-controlled DC power supply has the following main characteristics: the working frequency is as high as 100kHz-200kHz, the transient current change rate reaches 500A / μS, and the conversion efficiency is required to be greater than 95%. These technical requirements are extremely challen...

AI Technical Summary

Problems solved by technology

[0008] With the increase of switching frequency, the switching loss is getting bigger and bigger, but the high-end program-controlled DC power supply has higher and higher requirements for efficiency, and the switching efficiency requirement is often as high as 95%, or even as high as 98%. Circuits and methods, such a high switching efficiency must be difficult to achieve

Especially for high-end programmable DC power supplies with a height of 1U and high power, it is no longer a problem of switching loss, or even cannot work normally.

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