| 摘要 |
PURPOSE:To surely and easily control the output of a discharge lamp. CONSTITUTION:The device is equipped with a self exciting type inverter circuit which makes a DC power supply 1 input, also makes a resonance circuit load, which is made up of a choke coil 7, a capacitor 6, and of a discharge lamp 5, a capacitor 16 is rested in a closed circuit including a switching element 3 and a feedback winding n3 for the self exciting type inverter circuit, and a variable resistor 17 which changes and controls the output of the discharge lamp 5, is connected to the capacitor 16 in parallel. When the value of the variable resistor 17 is changed, the base control condition of the switching element (transistor) 3 is changed, the oscillating frequency of the self exciting type inverter circuit is accordingly changed, so that current to the discharge lamp 5 is thereby changed. |
