Electronic flash device
AssigneeWest Electric Company, Ltd.
InventorTakahiro Ikeda
Life of this patent
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Abstract
An electronic flash device provided with an auxiliary winding electromagnetically coupled to a winding in a DC-DC converter which is connected to a main power supply and generates a voltage for charging a main flash capacitor, an auxiliary capacitor adapted to be charged with at least the voltage induced across the auxiliary winding, and a control circuit for maintaining the voltage charged across the auxiliary capacitor at a predetermined level, whereby the voltage charged across the auxiliary capacitor can be delivered to integrated circuits for the flash device.
Claims7
An electronic flash device of the type in which an auxiliary winding is electromagnetically coupled to a winding in a DC-DC converter for charging a main flash capacitor and an auxiliary capacitor is charged with the voltage induced across said auxiliary winding through a diode so that the voltage across said auxiliary capacitor can be used as an auxiliary power supply,
- characterized by the provision of
- a voltage control circuit comprising
- a voltage detector for detecting the voltage across said auxiliary capacitor, and
- a control circuit which is connected in series to said auxiliary winding and which is adapted to decouple of said auxiliary winding from said winding in said DC-DC converter in response to the output signal from said voltage detector,
- whereby the voltage across said auxiliary capacitor can be controlled as desired.
Dependencies are inferred from the claim text.