DC/DC converter with LLC serial resonance

A technology of converters and series capacitors, applied in the direction of converting DC power input to DC power output, instruments, adjusting electrical variables, etc., can solve problems such as limited input voltage and small range
CN1368787AInactive Publication Date: 2002-09-11DELTA ELECTRONICS INC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
DELTA ELECTRONICS INC
Publication Date
2002-09-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a DC / DC converter. The DC / DC converter includes a square wave generator, which is used to output a series of voltage in form of square wave. The said square wave generator includes a serial capacitor which is connected to serial inductor and parallel inductor. Primary side of transformer is cascaded to a serial inductor in the DC / DC converter, then connected to an inductorin parallel. Secondary side of transformer is connected to a rectification circuit so as to provide a rectified DC voltage for output load circuit. The first characteristic resonance frequency of theserial capacitor and the serial inductor are expressed as fs. The second characteristic resonance frequency of the serial capacitor and the serial inductor as well as parallel inductor are expressed as fn where fs>fn. Switching of variable frequency in the converter carries out the output adjustment. Based on frequency switching between first and second characteristic resonance frequency, the converter realizes high conversion efficiency when working under high input voltage.
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Description

technical field

[0001] The present invention relates generally to power supply systems involving DC / DC conversion operations. More particularly, the present invention relates to an improved circuit design and construction for better power conversion efficiency, wider operating range and improved soft switching performance. Background technique

[0002] The design and manufacture of known art DC / DC converters have limitations of low power conversion efficiency and narrow operating range. Specifically, in known Pulse Width Modulation (PWM) converters, in order to maintain the output voltage in an environment of falling input voltage and for the required hold-up time, a compromise must be made on the duty cycle and other operating parameters to The hold-up time requirement is met under a low input voltage condition. Power conversion efficiency is sacrificed for normal operation with an input voltage within its normal range. Such inability to optimize the circuit design to se...

Claims

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