Boost controller capable of step-up ratio control

Details Boost controller capable of step-up ratio control Boost controller capable of step-up ratio control

2007-12-11

2007-12-11

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S291000, C315S121000, C315S077000, C315S082000

Reexamination Certificate

active

11083516

ABSTRACT:
A charge pump circuit boosts a voltage of a battery so as to generate a drive voltage for an LED. A constant current circuit generates a constant current to feed through the LED. A monitoring circuit monitors a cathode potential of the LED, i.e., a voltage across the constant current circuit. A control circuit receives a result of monitoring from the monitoring circuit110and increases a step-up ratio of the charge pump circuit when the voltage across the constant current circuit drops below a minimum voltage that guarantees a constant current. The control circuit sets an externally requested constant current value in the constant current circuit. When a change from a large current to a small current is requested, the control circuit returns the step-up ratio of the charge pump circuit to 1.0.

REFERENCES:
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patent: 10-215564 (1998-08-01), None
English Abstract for JP 10-215564 dated Aug. 11, 1998.

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