Discharge lamp lighting device, projector, and method of controlling projector

A method of controlling a projector, comprising:

• providing a projector including
• a discharge lamp provided with a pair of electrodes,
• a modulation section adapted to modulate light emitted by the discharge lamp,
• a projection optical system adapted to project the light modulated by the modulation section on a projection surface, and
• a discharge lamp lighting device connected to the discharge lamp including
• a capacitance connected to a direct-current power supply,
• a transformer having a primary coil connected to the capacitance and a secondary coil connected to the pair of electrodes of the discharge lamp,
• a switching circuit connected to the capacitance, and adapted to control a discharge current from the capacitance to the transformer, and
• a discharge control section connected to the switching circuit, and adapted to control the switching circuit;
• charging the capacitance with a current from the direct-current power supply;
• switching the switching circuit to ON after a voltage between both ends of the capacitance has reached a reference voltage;
• switching ON the discharge current from the capacitance to the primary coil;
• outputting a starting voltage from the transformer between the pair of electrodes of the discharge lamp,
• wherein the switching of the switching circuit to ON in the switching can be operated in accordance with a plurality of reference voltages.