Discharge lamp lighting circuit
AssigneeKoito Manufacturing Co., Ltd.
InventorsMasayasu Ito, Hitoshi Takeda
Life of this patent
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Abstract
A lighting circuit carrying out lighting control of plural discharge lamps in which depressing of ripple current and noise, small-sizing, and low cost are realized. Plural DC-DC converting circuits (3—1, 3—2) for converting direct current input voltage to designated direct current voltage by ON/OFF control of switching elements in a discharge lamp lighting circuit carrying out controlling lighting plural discharge lamps. Control signal from a control circuit 7 is supplied to each switching element constituting each DC-DC converting circuit, and state of conductivity or non-conductivity of each switching element is controlled as non-synchronization.
Claims7
Discharge lamp lighting circuit for lighting plural discharge lamps, comprising:
- a plurality of DC-DC converting circuits for converting direct current input voltage to designated direct current voltage, each DC-DC converting circuit having a switching element;
- and
- control circuit for carrying out ON/Off control at each of said switching elements,
- wherein state of conductivity or non-conductivity of each switching element is controlled as non-synchronization.
Dependencies are inferred from the claim text.