Power supply voltage converting circuit control method...

Details Power supply voltage converting circuit control method... Power supply voltage converting circuit control method...

2007-04-17

2007-04-17

Shalwala, Bipin (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Display power source

C345S212000, C345S213000

Reexamination Certificate

active

10182873

ABSTRACT:
In a power supply voltage converting circuit using a charge pump circuit having a switch device (Nch MOS transistor Qn(12) and Pch MOS transistor Qp(12)) in an output unit, a first clamp circuit (13) diode-clamps a switching pulse voltage (control pulse voltage) for the switch device at the time of starting the power supply voltage converting circuit, and a second clamp circuit (16) clamps the switching pulse voltage at a ground level (negative side circuit power supply potential) on the basis of a clamp pulse obtained by using an output voltage Vout at the time of an end of the starting process. A sufficient driving voltage is thereby provided for the Pch MOS transistor Qp(12) in particular. Thus, a power supply voltage converting circuit that can obtain a high current capacity on a small-area circuit scale, a control method thereof, a display apparatus having the power supply voltage converting circuit as a power supply circuit, and a portable terminal having the display apparatus are provided.

REFERENCES:
patent: 6181313 (2001-01-01), Yokota et al.
patent: 6509894 (2003-01-01), Maekawa et al.
patent: 6522319 (2003-02-01), Yamazaki
patent: 6633287 (2003-10-01), Yatabe et al.
patent: 2003/0011586 (2003-01-01), Nakajima
patent: 1-110758 (1989-04-01), None
patent: 7-73669 (1995-03-01), None
patent: 7-322605 (1995-12-01), None

Affiliated with

Also associated with

Rating

Power supply voltage converting circuit control method... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Power supply voltage converting circuit control method..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power supply voltage converting circuit control method... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3756791