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公开(公告)号：US11949340B2
公开(公告)日：2024-04-02
申请号：US16953368
申请日：2020-11-20
发明人： Hai-Bin Song , Qi Fu , Jian Zhou , Dao-Fei Xu , Jin-Fa Zhang
CPC分类号： H02M3/33576 , H02M3/33507 , H02M1/0032 , H02M3/01
摘要： A conversion device includes a primary side circuit, a secondary side circuit, a transformer, and a control circuit. The primary side circuit includes a primary side switch and is configured to receive an input voltage. The secondary side circuit outputs an output voltage to a load. The transformer comprises a primary winding and a secondary winding, the primary winding is electrically coupled to the primary side circuit and the secondary winding electrically coupled to the secondary side circuit. The control circuit is configured to control a peak value of the current of the primary side switch, to be limited in a band range.
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公开(公告)号：US11264914B2
公开(公告)日：2022-03-01
申请号：US17157948
申请日：2021-01-25
发明人： Hai-Bin Song , Qi Fu , Jian Zhou , Dao-Fei Xu , Jin-Fa Zhang
摘要： A converter includes a transformer, an active clamp circuit, a primary side switch, a secondary side switch, a load detection circuit, a state detection circuit and a control circuit. The active clamp circuit is electrically coupled to the primary winding of the transformer, and includes a clamp switch. The primary side switch is electrically coupled to the primary winding and a primary ground terminal. The secondary side switch is electrically coupled to a secondary winding of the transformer and a load. The control circuit outputs a control signal to turn on or turn off the clamp switch. The control circuit sets a blanking time according to the load state signal, such that the clamp switch is turned on when a drain-source voltage of the primary side switch is at a peak value of a resonance after the blanking time starting from the reference time point.
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公开(公告)号：US10651749B2
公开(公告)日：2020-05-12
申请号：US16238533
申请日：2019-01-03
发明人： Hai-Bin Song , Dao-Fei Xu , Jian Zhou , Le-Yang Yang , Qi Fu , Jin-Fa Zhang
IPC分类号： H02M3/335
摘要： A converter includes a transformer, a main switch, an active clamping circuit, a synchronous rectifying switch and a processing circuit. The transformer includes a primary winding and a secondary winding. The main switch is coupled to the primary winding. The active clamping circuit clamps the voltage across the main switch when it is OFF. The active clamping circuit includes an auxiliary switch. The synchronous rectifying switch is coupled to the secondary winding. The processing circuit determines whether the rectifying switch is in a main conducting period or a sub conducting period according to a first voltage signal across the rectifying switch and at least one detecting signal from the converter, and generates a driving signal to control the synchronous rectifying switch accordingly.
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公开(公告)号：US10938312B2
公开(公告)日：2021-03-02
申请号：US16835331
申请日：2020-03-31
发明人： Hai-Bin Song , Qi Fu , Jian Zhou , Dao-Fei Xu , Jin-Fa Zhang
摘要： A converter includes a transformer, a primary side switch, a load detection circuit, a state detection circuit and a control circuit. The transformer is configured to output a voltage to a load. The primary side switch is coupled to a primary winding and a primary ground terminal. The load detection circuit is configured to detect a load state of the load and output a load state signal. The state detection circuit is configured to detect a reference time point. The control circuit is configured to output a control signal to turn on or off the primary side switch. The control circuit further sets a blanking time according to the load state signal, such that the primary side switch is turned on when a drain-source voltage of the primary side switch is at a valley of the resonance after the blanking time starting from the reference time point.
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公开(公告)号：US10651746B2
公开(公告)日：2020-05-12
申请号：US15803861
申请日：2017-11-06
发明人： Hai-Bin Song , Dao-Fei Xu , Jian Zhou , Le-Yang Yang , Qi Fu , Jin-Fa Zhang
摘要： A converter includes a transformer, a main switch, an active clamping circuit, a synchronous rectifying switch and a processing circuit. The transformer includes a primary winding and a secondary winding. The main switch is coupled to the primary winding. The active clamping circuit clamps the voltage across the main switch when it is OFF. The active clamping circuit includes an auxiliary switch. The synchronous rectifying switch is coupled to the secondary winding. The processing circuit determines whether the rectifying switch is in a main conducting period or a sub conducting period according to a first voltage signal across the rectifying switch and at least one detecting signal from the converter, and generates a driving signal to control the synchronous rectifying switch accordingly.
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公开(公告)号：US10177668B2
公开(公告)日：2019-01-08
申请号：US15677007
申请日：2017-08-14
发明人： Hai-Bin Song , Dao-Fei Xu , Jian Zhou , Le-Yang Yang , Qi Fu , Jin-Fa Zhang
摘要： A converter includes a transformer, a main switch, an active clamp circuit, and a control circuit. The transformer includes a primary winding and a secondary winding, and is configured to receive an input voltage and output an output voltage to a load. The main switch is coupled between the primary winding and a primary ground terminal. The active clamp circuit includes an auxiliary switch and a clamp capacitor. The auxiliary switch is coupled to the clamp capacitor in series, and the active clamp circuit is coupled in parallel to the two terminals of the primary winding or the main switch, and is configured to clamp the voltage across the main switch when it is OFF. The control circuit outputs an auxiliary switch control signal to turn on the auxiliary switch when the voltage across the main switch is at its first peak of the resonant voltage.
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