Invention Grant
US07991282B1 Method and circuit for charging of super capacitor as energy source for flash diodes
有权
超级电容器作为闪光二极管的能源充电的方法和电路
- Patent Title: Method and circuit for charging of super capacitor as energy source for flash diodes
- Patent Title (中): 超级电容器作为闪光二极管的能源充电的方法和电路
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Application No.: US12330448Application Date: 2008-12-08
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Publication No.: US07991282B1Publication Date: 2011-08-02
- Inventor: William J. McIntyre , John Philip Parry , Nathanael Griesert
- Applicant: William J. McIntyre , John Philip Parry , Nathanael Griesert
- Applicant Address: US CA Santa Clara
- Assignee: National Semiconductor Corporation
- Current Assignee: National Semiconductor Corporation
- Current Assignee Address: US CA Santa Clara
- Main IPC: G03B7/26
- IPC: G03B7/26 ; H05B37/00
Abstract:
A circuit and method for charging a super capacitor to an optimal voltage that provides a desired flash diode current value while minimizing power dissipation in circuit elements other than the flash diode. One embodiment uses periodic sampling of the current through the flash diode and termination of the charging upon the super capacitor having been charged to a voltage value that produces the desired flash diode current. Another embodiment includes a current regulator in the flash diode firing circuit that keeps the current at a substantially constant level during the time that the flash diode is being fired.
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