Delta Electronics (Shanghai) Co., Ltd

Kehua Ma

Daofei Xu

Haitao Zhang

A power adapter includes a transformer, an output terminal, a secondary side circuit and a secondary side controller including an operational amplifier. The secondary side circuit includes a first switch, a second switch and a sampling resistor. The first switch is connected with a secondary winding of the transformer and the second switch. The second switch is connected with the output terminal. The sampling resistor is connected between the secondary winding and the output terminal for acquiring a sampling voltage. The operational amplifier generates a voltage difference value according to the result of comparing a reference voltage value with a feedback voltage value. When the sampling voltage is lower than a first voltage level and the voltage difference value is greater than a second voltage level, the second switch is turned off under control of the secondary side controller.

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Shanghai, China

Kehua Ma