Power circuit
AssigneeFujitsu Limited
InventorsYu Yonezawa, Yoshiyasu Nakashima
Life of this patent
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Abstract
A power circuit includes: a rectifying circuit configured to rectify an AC voltage; a capacitor configured to integrate an output current of the rectifying circuit; a field effect transistor connected between the rectifying circuit and the capacitor; and a control circuit configured to supply a first gate voltage to a gate of the field effect transistor when a voltage of the capacitor is lower than a threshold value and supply a second gate voltage to the gate of the field effect transistor when the voltage of the capacitor is higher than the threshold value, wherein a resistance of the field effect transistor when the first gate voltage is supplied is higher than a resistance of the field effect transistor when the second gate voltage is supplied.
Claims10
A power circuit, comprising:
- a rectifying circuit configured to rectify an AC voltage;
- a capacitor configured to integrate an output current of the rectifying circuit;
- a field effect transistor connected between the rectifying circuit and the capacitor;
- and
- a control circuit configured to supply a first gate voltage to a gate of the field effect transistor when a voltage of the capacitor is lower than a threshold value and supply a second gate voltage to the gate of the field effect transistor when the voltage of the capacitor is higher than the threshold value,
- wherein a resistance of the field effect transistor when the first gate voltage is supplied is higher than a resistance of the field effect transistor when the second gate voltage is supplied;
- and
- wherein the first gate voltage and the second gate voltage are values greater than zero.
A power circuit, comprising:
- a rectifying circuit configured to rectify an AC voltage;
- a capacitor configured to integrate an output current of the rectifying circuit;
- an inductor connected between the rectifying circuit and the capacitor;
- a field effect transistor connected between the rectifying circuit and the inductor;
- and
- a control circuit configured to supply a first gate voltage to a gate of the field effect transistor when a voltage of the capacitor is lower than a threshold value and supply a second gate voltage to the gate of the field effect transistor when the voltage of the capacitor is higher than the threshold value,
- wherein a resistance of the field effect transistor when the first gate voltage is supplied is higher than a resistance of the field effect transistor when the second gate voltage is supplied.
Dependencies are inferred from the claim text.