Power supply unit

Electrical transmission or interconnection systems – Plural load circuit systems – Plural sources of supply

Reexamination Certificate

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Details

C307S019000, C307S028000, C307S009100

Reexamination Certificate

active

07830035

ABSTRACT:
The power supply unit has a sample-and-hold circuit that samples a voltage supplied from a power source to a load according to a sample timing signal and holds the voltage as an output set value for the DC/DC converter. The unit supplies a load with an output from the DC/DC converter controlled so that an output voltage of a power source becomes an output set value of the DC/DC converter when the voltage of the power source drops. Since a voltage corresponding to the voltage of the power source before the voltage drop is set to the output set value of the DC/DC converter, a stable power supply unit is obtained in which the difference is always small between the voltage of the power source in normal times and the output voltage from the DC/DC converter when the voltage of the power source temporarily fluctuates.

REFERENCES:
patent: 4-251522 (1992-09-01), None
patent: 2004-328950 (2004-11-01), None
patent: 2005-112250 (2005-04-01), None
patent: 2005-204391 (2005-07-01), None
patent: 2005-237149 (2005-09-01), None
International Search Report for PCT/JP2007/062217, Jul. 31, 2007.

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