Patent ID: 7081718
Filing Date: 2006-07-25
Classification: H05B

Abstract:
1. A power supply circuit for a flash discharge tube using a charge and discharge capacitor to supply electrical charges for light emission of a flash discharge tube including a positive electrode, a negative electrode and a trigger electrode, comprising: a surge circuit constituted by a first resistor and a diode connected in series, wherein said surge circuit is disposed between said negative electrode and positive electrode of said flash discharge tube and connected in parallel to the charge and discharge capacitor, and wherein the cathode side of the diode is connected to the anode side of the flash discharge tube, a transformer disposed between said charge and discharge capacitor and a power source to boost the voltage supplied to the charge and discharge capacitor; and a switching element connected in series in the circuit formed by said transformer and said charge and discharge capacitor, and controlled so as to be turned on during the charging of said charge and discharge capacitor and turned off in other cases.