Resonant converter and control circuit and control method thereof

A technology for resonant converters and control circuits, applied in control/regulation systems, converting DC power input to DC power output, instruments, etc., can solve problems such as inoperability and deviation of resonant converters, and achieve easy design and low peak current , the effect of low effective current

Active Publication Date: 2020-08-18
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, the inductance value of the resonant inductor and the capacitance value of the resonant capacitor may have

Method used

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  • Resonant converter and control circuit and control method thereof
  • Resonant converter and control circuit and control method thereof
  • Resonant converter and control circuit and control method thereof

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Embodiment Construction

[0017] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0018] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The invention discloses a resonant converter and a control circuit and a control method thereof. The resonant converter comprises a switching circuit and a resonance circuit, wherein the switching circuit has an upper switching tube coupled between an input voltage and a switching node and a lower switching tube coupled between the switching node and a reference ground. The control circuit comprises: a communication interface circuit, a storage circuit and a primary side switch control circuit, wherein the storage circuit provides a frequency setting signal according to a switching frequency set by a user; when the resonant converter is configured in an open-loop mode, and the primary side switch control circuit sets the frequencies of the first control signal and the second control signalaccording to the frequency setting signal, so that the frequencies of the first control signal and the second control signal are equal, and the conduction durations of the upper switching tube and the lower switching tube are controlled to be the same in one switch period and are both less than half of the resonance period of the resonance circuit.

Description

technical field [0001] The present invention relates to electronic circuits, and in particular, to a resonant converter and its control circuit and control method. Background technique [0002] In a resonant converter, a switching circuit converts a DC voltage into a square wave voltage and supplies it to a resonant circuit. The resonant circuit includes a resonant inductor and a resonant capacitor, and the resonant circuit has a resonant frequency determined by the inductance of the resonant inductor and the capacitance of the resonant capacitor. Usually, the switching frequency of the switching circuit is set equal to the resonant frequency to achieve zero current turn-off, thus reaching the best efficiency point. However, in practical applications, the inductance value of the resonant inductor and the capacitance value of the resonant capacitor may have a certain deviation from the theoretical value during design, so that the resonant converter cannot work at the best ef...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33576Y02B70/10Y02P80/10H02M3/33592H02M3/33571H02M3/01
Inventor 欧阳茜
Owner CHENGDU MONOLITHIC POWER SYST
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