DC to DC converter and voltage detecting circuit and current...

Details DC to DC converter and voltage detecting circuit and current... DC to DC converter and voltage detecting circuit and current...

2006-03-22

2008-08-05

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

By periodic switching

C327S307000, C330S009000

Reexamination Certificate

active

07408390

ABSTRACT:
A DC to DC converter includes a current detecting circuit having a level shift circuit, which includes a resistor and a current source. A first low-pass filter is led out from a node via a signal line and includes a resistor and a capacitor. A first switch is provided after the level shift circuit, a second switch is provided after the low-pass filter, a second low-pass filter, which includes a resistor and a capacitor, an operational amplifier, a third switch is provided between an output terminal and an inverted input terminal of the operational amplifier, and a capacitor is provided between the inverted input terminal of the operational amplifier and GND. An output current is detected with high accuracy without lowering the efficiency by detection resistance.

REFERENCES:
patent: 3516002 (1970-06-01), Hillis
patent: 3638129 (1972-01-01), Pryor
patent: 3694760 (1972-09-01), Loessi
patent: 6031420 (2000-02-01), Vander Voorde
patent: 6507241 (2003-01-01), Ritter
patent: 6621334 (2003-09-01), Ausserlechner et al.
patent: 2005/0057229 (2005-03-01), Kobayashi
patent: 2005-65447 (2005-03-01), None

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