Discharge lamp lighting apparatus

A discharge lamp lighting apparatus comprising:

• a DC power supply for supplying power to a discharge lamp;
• a conversion circuit, including a switching element, for converting the voltage of the DC power supply into a high frequency;
• and
• an LC resonance circuit between the discharge lamp and the conversion circuit;
• wherein by opening and closing operations of the switching element, power supply from the DC power supply to the discharge lamp is intermittently performed, and wherein when the power is not supplied from the DC power supply, a resonance current passing through the resonance circuit is circulated through the switching element.

A discharge lamp lighting apparatus comprising:

• a DC power supply for supplying power to a discharge lamp;
• a transformer for transmitting a voltage of the DC power supply to the discharge lamp;
• a power supply switching element connected between the DC power supply and a primary side of the transformer;
• and
• a first switching element and a second switching element that are connected to the primary side of the transformer,
• wherein there are provided;
• a term to supply power from the DC power supply when the power supply switching element is turned on, and either the first switching element or the second switching element is turned on;
• and a term to pass a current through the primary side of the transformer when the power supply switching element is turned off, and the first switching element and the second switching element are turned on at the same time,
• whereby power is intermittently supplied from the DC power supply to the transformer, and when power is not supplied from the DC power supply to the transformer, a current passing through the primary side of the transformer is circulated.