Lighting device, lighting control device, illumination device, and projector

A lighting device which supplies power to an electrode of a discharge lamp to light the discharge lamp, comprising:

• a converting circuit which includes a pair of first switching elements and a pair of second switching elements to which a direct current is input, and converts the direct current into an alternating current by switching between a state where one of the pair of first switching elements and the pair of second switching elements is turned on and a state where the other of the pair of first switching elements and the pair of second switching elements is turned off;
• a pulse generating circuit which generates a high voltage pulse from the alternating current input from the converting circuit and applies the generated high voltage pulse to the electrode;
• and
• a trigger circuit which causes the pulse generating circuit to generate the high voltage pulse,
• wherein the pulse generating circuit includes a primary winding connected to the trigger circuit and a secondary winding connected to the converting circuit and generates the high voltage pulse by increasing a current input to the secondary winding based on a current input to the primary winding, and
• the trigger circuit includes
• a high pass filter which is connected at a middle point between the first switching elements and the second switching elements, flows the alternating current if the alternating current having a frequency which is equal to or higher than a predetermined frequency is input from the converting circuit, and interrupts the alternating current if the alternating current having a frequency which is lower than the predetermined frequency is input from the converting circuit;
• a first capacitor which stores and discharges charges input via the high pass filter;
• and
• a third switching element which outputs an output current from a second capacitor connected in parallel to the converting circuit to the primary winding if an output voltage from the first capacitor exceeds a threshold.