Flyback converter and its control circuit
A technology of flyback converter and control circuit, which is applied in the direction of control/regulation system, conversion of DC power input to DC power output, conversion of AC power input to DC power output, etc. frequency, the inability to realize zero-voltage switching, etc., to achieve the effect of reducing ultra-light load efficiency and standby power consumption, reducing chip pins and peripheral devices, and high efficiency
Active Publication Date: 2020-04-24
西安矽力杰半导体技术有限公司
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- Description
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- Application Information
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Problems solved by technology
Since the conduction time of the auxiliary switch tube is a fixed time, the main switch tube and the auxiliary switch tube cannot realize zero-voltage switching in a wide input voltage range, which is not conducive to the high frequency of the flyback converter
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[0040] Various embodiments of the invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.
[0041] In the present application, a switch transistor is a transistor that works in a switch mode to provide a current path, including one selected from bipolar transistors or field effect transistors. The first end and the second end of the switch tube are respectively high potential end and low potential end on the current path, and the control end is used to receive a driving signal to control the switch tube to be turned on and off.
[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0043] figure 1 A schematic circuit diagram of a flyback converter according to a first embodiment of the...
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The embodiment of the present application discloses a control circuit for a flyback converter, the flyback converter uses a main switch to control the energy storage and transmission of the transformer, and uses an auxiliary switch to provide the leakage inductance of the transformer The energy release path, the control circuit adjusts the conduction time of the auxiliary switch according to the drain-source voltage at the moment when the main switch is turned on, so that the main switch is turned on with zero voltage, and the zero-voltage turn-on of the main switch is realized , to reduce the turn-on loss of the auxiliary switching tube to improve efficiency. The embodiment of the present application also discloses a flyback converter.
Description
technical field [0001] The present invention relates to power electronics technology, more specifically, to a flyback converter and its control circuit. Background technique [0002] The flyback converter is a power converter that stores energy in the transformer when the switch is turned on, and delivers the energy stored in the transformer to the load when the switch is turned off. The transformer is the main part of the flyback converter to store and deliver energy. When the switching tube is turned off, a spike voltage will be generated due to the leakage inductance of the primary winding of the transformer. At the same time, when the switching tube works in the hard switching mode, the waveforms of the voltage drop and the current rise overlap during the conduction process, so the turn-on loss is large. [0003] In an improved flyback converter, a clamp control method is used to absorb the spike voltage. The flyback converter includes a main switching tube and an aux...
Claims
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IPC IPC(8): H02M7/217H02M3/335H02M1/32
CPCH02M1/32H02M3/33569H02M7/217H02M1/0054H02M3/33507Y02B70/10H02M1/0058H02M1/342H02M3/33515H02M3/33523H02M3/33592
Inventor 杨向东徐孝如白永江胡志亮
Owner 西安矽力杰半导体技术有限公司