Over-voltage protection circuit
First Claim
1. An over-voltage protection circuit for connection to a charging circuit for maintaining a voltage across an energy storage device at or below a predetermined voltage during charging, comprising:
- an over-voltage protection device; and
an over-voltage protection controller for connecting said over-voltage protection device in parallel with said energy storage device only when the voltage across the energy storage device exceeds said predetermined voltage, so as to draw excess charge from said energy storage device;
wherein said over-voltage protection device comprises a capacitor.
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Accused Products
Abstract
An over-voltage protection circuit is disclosed herein for protection against over-voltage of an energy storage device while charging. The circuit operates within the operational limits of a battery-operated device, such as a mobile or handheld device. The over-voltage protection circuit comprises an over-voltage protection device, and an over-voltage protection controller. The controller allows current to flow to the over-voltage protection device only when an energy storage device is experiencing over-voltage. In allowing current to flow to the over-voltage protection device only when the voltage across the energy storage device is above a predetermined voltage, power conservation is achieved.
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Citations
29 Claims
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1. An over-voltage protection circuit for connection to a charging circuit for maintaining a voltage across an energy storage device at or below a predetermined voltage during charging, comprising:
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an over-voltage protection device; and an over-voltage protection controller for connecting said over-voltage protection device in parallel with said energy storage device only when the voltage across the energy storage device exceeds said predetermined voltage, so as to draw excess charge from said energy storage device; wherein said over-voltage protection device comprises a capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An over-voltage protection circuit for connection to a charging circuit for maintaining a voltage across an energy storage device at or below a predetermined voltage during charging, comprising:
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an over-voltage protection device; and an over-voltage protection controller for connecting said over-voltage protection device in parallel with said energy storage device only when the voltage across the energy storage device exceeds said predetermined voltage, so as to draw excess charge from said energy storage device; wherein said over-voltage protection device comprises an inductor. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. An over-voltage protection circuit for connection to a charging circuit for use with a handheld device for maintaining a voltage across an energy storage device at or below a predetermined voltage so as to avoid over-voltage during charging, comprising:
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an over-voltage protection device, the over-voltage protection device including a capacitor; and an over-voltage protection controller for connecting said over-voltage protection device in parallel with said energy storage device in response to an over-voltage condition at the energy storage device, so as to draw excess charge from said energy storage device, wherein said over-voltage protection circuit is connected to charging leads which are connected to the charging circuit. - View Dependent Claims (27)
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28. An over-voltage protection circuit for connection to a charging circuit for use with a handheld device for maintaining a voltage across an energy storage device at or below a predetermined voltage so as to avoid over-voltage during charging, comprising:
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an over-voltage protection device, the over-voltage protection device including an inductor; and an over-voltage protection controller for connecting said over-voltage protection device in parallel with said energy storage device in response to an over-voltage condition at the energy storage device, so as to draw excess charge from said energy storage device, wherein said over-voltage protection circuit is connected to charging leads which are connected to the charging circuit. - View Dependent Claims (29)
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Specification