Discharge lamp ballast apparatus

Details Discharge lamp ballast apparatus Discharge lamp ballast apparatus

2007-11-20

2007-11-20

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000

Reexamination Certificate

active

10568534

ABSTRACT:
A primary side current value to be shunted from a DC power source (1) to the primary side of a DC power circuit (2) is detected by a primary side current detection resistor (5), and an output current value to be shunted to an inverter curcuit (3) and its downstream is detected by a current detection resistor (6). On the basis of those current values detected, the total current value to flow into a plurality of load curcuits such as the DC power supply circuit (2) and the inverter circuit (3) is detected by a total current detection unit (7). On the basis of the total current value detected, a control unit (8) controls a switching transistor (24) of the DC power circuit (2) to control an output power thereby to control an electric current (Ib) to be fed from the DC power cource (1).

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