An extension photoflash light and a camera system using the same are provided. The extension photoflash light to be externally mounted on a mobile device with a photographing function comprises a HID lamp, a mounting mechanism, a light sensing circuit and a control circuit. The mounting mechanism is for mounting the extension photoflash light. The light sensing circuit is disposed on the mounting mechanism. The control circuit is coupled to the HID lamp and the light sensing circuit. When a camera program is executed, a specific block on a flat panel display of the mobile device emits a light signal. The control circuit controls the light sensing circuit to detect the light signal of the specific block, and decodes a decoding message according to luminance of the detected light signal, and controls the HID lamp to perform flashing at a specific timing according to the decoding message.

A flash light source device includes a flash lamp, a wring board, and a power feeding unit. The flash lamp includes a sealed container provided with a light transmission window on one end face and having a discharge gas enclosed therein, a cathode and an anode to induce arc discharge in the sealed container, and lead pins projecting from the other end face of the sealed container. The wiring board has a principal surface and a back surface. The lead pins of the flash lamp arranged opposite to the principal surface are bonded so as to be fixed in an electrically conductive manner to the wiring board. The power feeding unit implements charge and discharge of an electric current to be supplied to the flash lamp. The power feeding unit has chip capacitors surface-mounted on the wiring board.

A flash light source device includes a flash lamp, a wring board, and a power feeding unit. The flash lamp includes a sealed container provided with a light transmission window on one end face and having a discharge gas enclosed therein, a cathode and an anode to induce arc discharge in the sealed container, and lead pins projecting from the other end face of the sealed container. The wiring board has a principal surface and a back surface. The lead pins of the flash lamp arranged opposite to the principal surface are bonded so as to be fixed in an electrically conductive manner to the wiring board. The power feeding unit implements charge and discharge of an electric current to be supplied to the flash lamp. The power feeding unit has chip capacitors surface-mounted on the wiring board.

A voltage doubling circuit including a silicon controlled rectifier (SCR) having a control circuit configured to charge a charging capacitor during a negative alternating current cycle, and including a storage capacitor that receives a voltage from the charging capacitor during a positive alternating current cycle, and by charging the storage capacitor from the charging capacitor when the SCR is off, the storage capacitor is prevented from exceeding its regulated voltage even if the SCR fails.

A voltage doubling circuit including a silicon controlled rectifier (SCR) having a control circuit configured to charge a charging capacitor during a negative alternating current cycle, and including a storage capacitor that receives a voltage from the charging capacitor during a positive alternating current cycle, and by charging the storage capacitor from the charging capacitor when the SCR is off, the storage capacitor is prevented from exceeding its regulated voltage even if the SCR fails.

A voltage doubling circuit including a silicon controlled rectifier (SCR) having a control circuit configured to charge a charging capacitor during a negative alternating current cycle, and including a storage capacitor that receives a voltage from the charging capacitor during a positive alternating current cycle, and by charging the storage capacitor from the charging capacitor when the SCR is off, the storage capacitor is prevented from exceeding its regulated voltage even if the SCR fails.

A voltage doubling circuit including a silicon controlled rectifier (SCR) having a control circuit configured to charge a charging capacitor during a negative alternating current cycle, and including a storage capacitor that receives a voltage from the charging capacitor during a positive alternating current cycle, and by charging the storage capacitor from the charging capacitor when the SCR is off, the storage capacitor is prevented from exceeding its regulated voltage even if the SCR fails.