Power supply apparatus comprising a voltage detection circuit and method for using same
AssigneeHitachi, Ltd.
InventorsMasahiro Watanabe, Kazuo Kato, Kenji Ogawa, Isao Ueno
Life of this patent
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Abstract
The present invention provides a power supply apparatus comprising a voltage detection circuit connected to a smoothing circuit and an AC switch having a low ON-resistance with no offset voltage at current-buildup and further connected to a secondary winding of a current transformer wherein when an output voltage of the smoothing circuit increases up to a predetermined value the output voltage is detected by the voltage detection circuit and the AC switch is turned on by an output signal of the voltage detection circuit whereby the secondary winding of the current transformer is short-circuited.
Claims56
A power supply apparatus comprising:
- a voltage detection circuit connected to an output side of a smoothing circuit and an input side of an AC switch said smoothing circuit having a DC voltage supplied thereto;
- said AC switch having a low ON-resistance with no offset voltage at current-buildup and further connected to a secondary winding of a current transformer;
- and
- wherein when an output voltage of said smoothing circuit increases up to a predetermined value said output voltage is detected by said voltage detection circuit and said AC switch is turned on by an output signal of said voltage detection circuit whereby said secondary winding of said current transformer is short-circuited.
A power supply apparatus comprising:
- a voltage detection circuit connected to a smoothing circuit and an AC switch having a low ON-resistance with no offset voltage at current-buildup and further connected to a secondary winding of a current transformer wherein when an output voltage of said smoothing circuit increases up to a predetermined value said output voltage is detected by said voltage detection circuit and said AC switch is turned on by an output signal of said voltage detection circuit whereby said secondary winding of said current transformer is short-circuited.
A power supply apparatus comprising:
- a voltage detection circuit connected to a smoothing circuit and an AC switch connected to a secondary winding of a current transformer wherein when an output voltage of said smoothing circuit increases up to a predetermined value said output voltage is detected by said voltage detection circuit and said AC switch is turned on by an output signal of said voltage detection circuit whereby said secondary winding of said current transformer is short-circuited.
A method of controlling current in a power supply apparatus comprising the steps of:
- providing a voltage detection circuit connected to an output side of a smoothing circuit and an input side of an AC switch said smoothing circuit having a DC voltage supplied thereto;
- said AC switch having a low ON-resistance with no offset voltage at current-buildup and further connected to a secondary winding of a current transformer;
- and
- wherein when an output voltage of said smoothing circuit increases up to a predetermined value said output voltage is detected by said voltage detection circuit and said AC switch is turned on by an output signal of said voltage detection circuit whereby said secondary winding of said current transformer is short-circuited.
A method of controlling current in a power supply apparatus comprising the steps of:
- providing a voltage detection circuit connected to a smoothing circuit and an AC switch having a low ON-resistance with no offset voltage at current-buildup and further connected to a secondary winding of a current transformer wherein when an output voltage of said smoothing circuit increases up to a predetermined value said output voltage is detected by said voltage detection circuit and said AC switch is turned on by an output signal of said voltage detection circuit whereby said secondary winding of said current transformer is short-circuited.
A method of controlling current in a power supply apparatus comprising the steps of:
- providing a voltage detection circuit connected to a smoothing circuit and an AC switch connected to a secondary winding of a current transformer wherein when an output voltage of said smoothing circuit increases up to a predetermined value said output voltage is detected by said voltage detection circuit and said AC switch is turned on by an output signal of said voltage detection circuit whereby said secondary winding of said current transformer is short-circuited.
Dependencies are inferred from the claim text.