Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1997-02-28
2000-08-22
Kim, Jung Ho
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
363 60, G05F 110
Patent
active
06107862&
ABSTRACT:
An improved charge pump circuit includes one switch element driven by a ramp waveform to precisely control the output voltage. The circuit includes a switch group having one or more switch elements for transferring a charge to one or more capacitors, a feedback circuit having an error amplifier for amplifying a difference between a divided output voltage and a reference voltage, a compensation circuit for phase compensating the feedback network, an oscillator for generating the ramp waveform, and a control circuit for driving the one or more switch elements. At least one of the switch elements has a resistance that can be adjusted externally and is driven by the ramp waveform such that its resistance varies with time. Accordingly, the charge transferred from a power source to the one or more capacitors can easily be adjusted. When the charge transferred is small, the on-time of the ramp waveform is short and the average value of the resistance is large. The average resistance of the switch group varies when the voltage of the power source varies, so that an output with a fixed voltage and low ripple voltage can be obtained.
REFERENCES:
patent: 4999761 (1991-03-01), Bingham et al.
patent: 5132895 (1992-07-01), Kase
patent: 5642073 (1997-06-01), Manning
patent: 5677645 (1997-10-01), Merritt
Patent Abstracts of Japan, vol. 95, No. 3, Apr. 28, 1995.
Patent Abstracts of Japan, vol. 97, No. 2, Feb. 28, 1997.
Mukainakano Hiroshi
Shibata Kimio
Kim Jung Ho
Seiko Instruments Inc.
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