Double N signal channel semi-bridge type current converter

Abstract

The present invention discloses a semi-bridge system commutation device with double N channels, which comprises a push-pull control chip, a first control signal with an output duty ratio higher than 50%, a second control signal with an output duty ratio lower than 50%, a first cushion circuit coupled with the push-pull control chip, a second cushion circuit coupled with the push-pull control strip, a drive circuit coupled with the push-pull control strip and a DC power source through the first cushion circuit to receive the first control signal and a semi-bridge switch assembly composed of two N channel field effect transistors. Wherein, the semi-bridge switch assembly is coupled with the DC power source, the drive circuit, the second cushion circuit and a transformer and is controlled by the drive circuit to switch the DC power source into a AC power source and then send the AC power source to a secondary side of the transformer.

Description

technical field [0001] The invention relates to a dual N-channel half-bridge converter device, in particular to a converter device capable of controlling the half-bridge converter and driving loads by using a push-pull control chip. Background technique [0002] The power supply (Power Supply) of the TFT panel backlight mainly uses an inverter circuit (Inverter Circuit) to achieve energy conversion and drive the light emission of cold cathode fluorescent lamps (CCFL). The existing inverter circuit (Inverter Circuit) is generally divided into half-bridge inverter circuit, full-bridge inverter circuit and push-pull inverter circuit due to different circuit topology. stream circuit. [0003] As shown in FIG. 1 , it is a schematic circuit diagram of an existing push-pull converter circuit applied to a CCFL load. The transformer T1 divides the circuit into a primary-side pre-stage circuit 101 and a secondary-side post-stage circuit 102 . The primary side 101 includes: a DC pow...

AI Technical Summary

Problems solved by technology

Therefore, there is a lack of flexibility and sharing in practice

In addition, the use of the inverter circuit (Inverter Circuit) is often limited to the control chip, and the inverter circuit (Inverter Circuit) is subject to the above description, so that the control chip cannot be shared and purchased in a unified manner, or it needs to be matched with more more complex circuit

[0009] At the same time, the existing half-bridge commutation circuit needs to use an isolation transformer to control the switching action of the electronic switch, and the electronic switch cannot be directly driven by the half-bridge control chip.

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