Resonant converter and control method therefor
A resonant conversion and control terminal technology, which is applied in the direction of output power conversion device, control/regulation system, high-efficiency power electronic conversion, etc., can solve the problems of power conversion efficiency decrease, switching frequency increase, etc., and achieve the effect of improving power conversion efficiency
Active Publication Date: 2018-01-26
LITE ON ELECTRONICS (GUANGZHOU) LTD +1
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Correspondingly, in order to generate a stable output voltage, the series resonant converter will increase the switching frequency of the switch and keep the switching frequency of the switch away from the resonant frequency provided by the resonance tank, resulting in a decrease in power conversion efficiency
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[0052] Please refer to figure 1 , figure 1 A schematic diagram showing a resonant conversion device according to an embodiment of the present invention. The resonant conversion device 100 includes a resonant conversion circuit 110 , a load detector 130 , a PWM signal generator 150 , and a control signal generator 120 . The resonant conversion circuit 110 receives an input voltage VIN, and converts the input voltage VIN according to a control signal CTR to generate an output voltage VOUT. An output terminal of the resonant conversion circuit 110 is coupled to a load 140 and provides an output voltage VOUT to drive the load 140 . The load detector 130 is coupled to the output terminal of the resonant conversion circuit 110 and used for detecting the load state of the load 140 . Wherein, the load detector 130 can obtain the load state by detecting the current demand of the load 140 . That is to say, the load detector 130 can obtain the load state by detecting the magnitude of...
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The invention provides a resonant converter and a control method therefor. The resonant converter comprises a resonant conversion circuit, a load detector, a control signal generator and a pulse frequency modulation signal generator, wherein the resonant conversion circuit is used for converting input voltage according to a pulse frequency modulation signal to generate output voltage to drive load; and the load detector detects the load condition of the load; the control signal generator is used for generating a control signal according to the load condition and a pulse frequency modulation range; and when the load condition is a light load condition, a control signal area is divided into a plurality of first time intervals and a plurality of second time intervals, the first time intervalsand the second time intervals are arranged in a staggered manner, and the pulse frequency modulation signal is kept at reference voltage in the second time intervals and is essentially equivalent toa periodic signal of a resonant frequency in the first time intervals. According to the resonant converter, the power conversion efficiency under the light load condition can be effectively improved.
Description
technical field [0001] The present invention relates to a resonant conversion device and a control method thereof, in particular to a resonant conversion device capable of improving power conversion efficiency in a light load state and a control method thereof. Background technique [0002] With the advancement of electronic technology, electronic devices have become important tools in people's lives. In order to make the electronic device satisfy the requirement of multi-function, various power sources are often required in the electronic device. Therefore, the power converter becomes an important device in the electronic device. [0003] For the known series resonant converter, its operating state with the best efficiency is when the switching frequency of its switches is close to the resonant frequency provided by the resonant tank in the series resonant converter. However, in actual operation, as the load of the series resonant converter becomes smaller, the required ou...
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IPC IPC(8): H02M3/335H02M7/48
CPCH02M3/3376Y02B70/10Y02P80/10H02M1/0032H02M1/0009H02M1/08H02M3/33507
Inventor 杨德鸿谢明琮罗有纲
Owner LITE ON ELECTRONICS (GUANGZHOU) LTD