Silergy Semiconductor Technology (Hangzhou) Ltd

Xinlei Li

Qiukai Huang

Zhiliang Hu

Qiao Zhang

Hao Chen

Le Li

Yongjiang Bai

Chaopeng Jin

An isolated power converter can include: a primary side having a primary winding and a primary power transistor; a secondary side having a secondary winding and a secondary power transistor; a secondary control circuit configured to change a voltage across the secondary winding to change a voltage across the primary winding during a period when both the primary power transistor and the secondary power transistor are in a turn-off state; and a primary control circuit configured to control switching states of the primary power transistor, such that an output signal of the isolated power converter matches an output demand.

Isolated power converter and data transmission method

A synchronous rectification control circuit for controlling a switching circuit comprising a synchronous rectifier switch, can include: a drive circuit configured to generate a drive signal to control switching states of the synchronous rectifier switch; and a voltage regulation circuit configured to control the drive circuit to adjust an amplitude of the drive signal to decrease to a preset threshold in an adjustment state when a drain-source voltage of the synchronous rectifier switch is greater than an adjustment threshold before the synchronous rectifier switch is turned off, where a time that the voltage regulation circuit is in the adjustment state is an adjustment time.

Switching circuit, synchronous rectification control circuit and control method thereof

A switching control circuit for a flyback converter having a main switch coupled to a primary winding of a transformer and a rectifier switch coupled to a secondary winding of the transformer, can include: a first voltage generating circuit configured to generate a first voltage sampling signal representing information of an input voltage; a synchronous rectification control circuit configured to adjust an on-time of the rectifier switch according to the first voltage sampling signal in order to adjust an absolute value of a negative current flowing through the secondary winding; and where the negative current is configured to discharge a parasitic capacitor of the main switch in order to reduce a drain-source voltage of the main switch.

Switching control circuit, switching control method and flyback converter thereof

A frequency control circuit, applied in a switching converter, can be configured to: regulate an off time of a power transistor of the switching converter in one switching cycle according to an on time of the power transistor, or regulate the on time of the power transistor in one switching cycle according to the off time of the power transistor; and maintain an operating frequency of the switching converter to be within a predetermined range.

Frequency control circuit, control method and switching converter

A flyback converter can include: a power switch controlled to be turned on/off to control a current through a primary side; a first primary winding coupled between an input terminal and a first terminal of the power switch, where a dotted terminal of the first primary winding is coupled to a first terminal of the power switch; a second primary winding coupled between a second terminal of the power switch and a primary grounding terminal, where a dotted terminal of the second primary winding is coupled to the primary grounding terminal; a secondary winding configured between the first and second primary windings in a radial direction of a magnetic core, where the first primary winding, the second primary winding, and the secondary winding are wound around the magnetic core; and a secondary rectifier and filter circuit coupled with the secondary winding, and configured to generate a stable current/voltage.

Transformer, flyback converter and switching power supply with the same

Disclosed are an isolated power converter and a switching control signal using the same. In the isolated power converter, the positions of the power switch and the primary winding are exchanged, and the feedback voltage detection and secondary current zero-crossing detection are carried out in accordance with the voltage across the primary winding. Thus, primary side control can still be implemented without employment of an auxiliary winding.

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Xinlei Li