Activation circuit with surge suppression and method of activating conversion apparatus
AssigneeAsian Power Devices Inc.
InventorsYeu-Torng YAU, Tsung-Liang HUNG
Life of this patent
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Abstract
An activation circuit with surge suppression is coupled to an output capacitor of a conversion apparatus. The activation circuit includes a detection circuit, a control circuit, and a surge suppression switch. The detection circuit provides an input signal to the control circuit according to an AC voltage received by an input end of the conversion apparatus, and determines whether the AC voltage is in a zero-crossing range according to the input signal. When the AC voltage in the zero-crossing range, the control circuit controls the surge suppression switch to connect a current path between the output capacitor and a ground end so as to active the conversion apparatus.
Claims10
An activation circuit with surge suppression coupled to an output capacitor of a conversion apparatus, the activation circuit comprising:
- a detection circuit coupled to an input end of the conversion apparatus, and configured to receive an AC voltage,
- a control circuit coupled to the detection circuit, and
- a surge suppression switch coupled to the control circuit and the output capacitor,
- wherein the detection circuit provides an input signal to the control circuit according to the AC voltage, and determines whether the AC voltage is in a zero-crossing range according to the input signal;
- when the AC voltage is in the zero-crossing range, the control circuit controls the surge suppression switch to connect a current path between the output capacitor and a ground end so as to activate the conversion apparatus.
A method of activating a conversion apparatus, the conversion apparatus comprising an output capacitor, the method comprising steps of:
- detecting an AC voltage to provide an input signal,
- determining whether the AC voltage is in a zero-crossing range according to the input signal, and
- controlling a surge suppression switch to connect a current path between the output capacitor and a ground end when the AC voltage is in the zero-crossing range so as to activate the conversion apparatus.
Dependencies are inferred from the claim text.