Patent ID: 7999480

Claim:
A control circuit configured to control the charge and discharge of a flash unit, comprising: a charging circuit coupled to a charging terminal, comprising: a first diode comprising an anode coupled to the charging terminal and a cathode coupled to the flash unit; a first resistor comprising a first terminal coupled to the anode of the first diode and a second terminal; a first capacitor comprising a first terminal coupled to the second terminal of the first resistor and a second terminal; a second resistor comprising a first terminal coupled to the second terminal of the first capacitor and a second terminal being ground; a second capacitor comprising a first terminal coupled to the cathode of the first diode and a second terminal; a third resistor comprising a first terminal coupled to the second terminal of the second capacitor and a second terminal being ground; a first switching element comprising a first terminal coupled to the anode of the first diode, a second terminal coupled to the second terminal of the second capacitor, and a control terminal; and a second diode comprising an anode coupled to the flash unit and a cathode coupled to the control terminal of the first switching element; and a triggering circuit coupled to a trigger terminal, comprising: a second switching element comprising a first terminal being grounded, a second terminal coupled to cathode of the second diode and the second terminal of the first resistor, and a control terminal coupled to the trigger terminal; a third capacitor comprising a first terminal coupled to the second terminal of the first resistor and a second terminal; and a transformer comprising a primary winding coupled to the second terminal of the third capacitor and a secondary winding coupled to the flash unit.