Emerson Network Power Energy System Ab

Emerson Network Power Energy Systems Ab

Yonggang Ru

Huajian Zhang

Baoguo Chen

Yanfeng Li

Shiqiang Yu

A switching power supply with overvoltage protection includes a soft start circuit, a rectifying circuit, a filter capacitor, a main supply, an auxiliary supply and a monitoring circuit. When the input voltage is higher than the predetermined protection voltage, a first electric control switch is turned off, and the main power circuit of the switching power supply is shut off. At the moment, the actuation and release of the second electric control switch is controlled so as to control the input power supply to intermittently charge the power supply module such that the output voltage downstream of the rectifying circuit inside the power supply is controlled in a safe range. For instance, the second electric control is turned on when the output voltage is lower than a certain value, and is turned off when the output voltage is higher than a certain value. Thus, it is ensured that the bus line voltage inside the power supply is controlled within a safe range, to ensure the safety of the devices inside the power supply; and at the same time to ensure the safety of the inner devices of the switching power supply, such that the auxiliary power supply and the control circuit can work normally.

Switching power supply with overvoltage protection and overvoltage protection method thereof

An improved inductance-voltage clamping full-bridge soft-switch circuit including a full-bridge converter, a transformer, an output rectifying unit, an inductor, a clamping resistor, a capacitor, a first clamping diode, and a second clamping diode. The inductor includes a first winding used as an auxiliary inductor and a second winding used for clamping. A capacitor is connected in parallel with the clamping resistor connected in series.

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Shenzhen, China

Yonggang Ru