Constant voltage power supply circuit

Details Constant voltage power supply circuit Constant voltage power supply circuit

2005-10-19

2008-09-30

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S225000, C323S226000, C323S303000

Reexamination Certificate

active

07429851

ABSTRACT:
A disclosed constant voltage power supply circuit (1) has an input terminal (Vdd), an output terminal (Vout), a constant voltage power supply unit (2) that generates a constant voltage (Vo1) with a ripple voltage (Vri), and a ripple removing circuit unit (3) for removing the ripple voltage so that a constant voltage (V1) without the ripple voltage is output at the output terminal (OUT). The ripple removing circuit unit comprises a resistor (R1) connected between the constant voltage power supply unit and the output terminal; a ripple voltage detection circuit unit (5) for detecting the ripple voltage and outputting a signal depending on the detected ripple voltage; and a current circuit unit (6, 7) for receiving the signal from the ripple voltage detection circuit unit and supplying a current (io1) to the output terminal or absorbing a current (io2) from the resistor in response to the received signal, so as to cancel the ripple voltage at the output terminal.

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Aug. 24, 2007 Korean offical action (with English translation) corresponding to Korean patent application No. 10-2006-7012093.
Mar. 25, 2008 Taiwanese offcial action (with English translation) in connection with corresponding Taiwanese application No. 94136715.

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