Discharge lamp lighting circuit
AssigneeKoito Manufacturing Co., Ltd.
InventorsMasayasu Ito, Hitoshi Takeda
Life of this patent
Estimating the term…
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.
Claims4
A 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;
- a 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;
- and
- a plurality of DC-AC converting circuits for respectively supplying a power to said discharge lamps, wherein each discharge lamp is lightened by each set of the DC-DC converting circuit and the DC-AC converting circuit.
A 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;
- a 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;
- and
- a DC-AC converting circuit for supplying a power to said discharge lamps, wherein two discharge lamps are lighted using a DC-DC converting circuit obtaining positive pole output, a DC-DC converting circuit obtaining negative pole output, and one DC-AC converting circuit.
Dependencies are inferred from the claim text.