Protection circuit limiting current applied to peripheral devices
First Claim
1. A protection circuit for limiting a current in a predetermined range, the current provided to a peripheral unit by a power source of an electronic device, the peripheral unit having a power storage unit, the protection circuit comprising:
- a first charging path disposed between the power source and the power storage unit, the first charging path limiting the current in a predetermined range;
a second charging path disposed between the power source and the power storage unit;
a voltage detector for detecting a voltage level of the power storage unit and selectively switching the first charging path and the second charging path to charge the power storage unit;
wherein when the voltage level of the power storage unit is lower than a threshold voltage, switching to the first charging path for the power source to charge the power storage unit;
when the voltage level of the power storage unit is higher or equal to the threshold voltage, switching to the second charging path for the power source to charge the power storage unit.
1 Assignment
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Accused Products
Abstract
The protection circuit for a power source of an electronic device capable of providing a certain range of current values to a peripheral unit comprising a power storage unit. The protection circuit comprises a first and second charging paths and a voltage detector. The voltage detector switches the first charging path to turn on the first switch, when the voltage value of the power storage unit 30 is lower than the threshold voltage, the power source can charge the power storage unit by the first switch, wherein the current limiting device limits the current value of first charging path to lower than a predetermined. The voltage detector switches the first charging path to breakup the second switch and the voltage detector switches to the first charging path to turn on the first switch.
9 Citations
21 Claims
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1. A protection circuit for limiting a current in a predetermined range, the current provided to a peripheral unit by a power source of an electronic device, the peripheral unit having a power storage unit, the protection circuit comprising:
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a first charging path disposed between the power source and the power storage unit, the first charging path limiting the current in a predetermined range; a second charging path disposed between the power source and the power storage unit; a voltage detector for detecting a voltage level of the power storage unit and selectively switching the first charging path and the second charging path to charge the power storage unit; wherein when the voltage level of the power storage unit is lower than a threshold voltage, switching to the first charging path for the power source to charge the power storage unit; when the voltage level of the power storage unit is higher or equal to the threshold voltage, switching to the second charging path for the power source to charge the power storage unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A peripheral unit coupling to an electronic device, the electronic device having a power source, the power source providing a current to the peripheral unit, the peripheral unit comprising:
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a power storage unit having a voltage level; a protection circuit comprising; a first charging path disposed between the power source and the power storage, the first charging path limiting the current in a predetermined range; a second charging path disposed between the power source and the power storage unit; a voltage detector for detecting the voltage level of the power storage unit and selectively switching the first charging path and the second charging path to charge the power storage unit; wherein when the voltage level of the power storage unit is lower than a threshold voltage, switching to the first charging path for the power source charging the power storage unit via the first charging path; when the voltage level of the power storage unit is higher or equal to the threshold voltage, switching to the second charging path for the power source charging the power storage unit via the second charging path. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An electronic device coupling to a peripheral unit, the peripheral unit having a power storage unit, the electronic device comprising:
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a power source providing a current to the peripheral unit; a protection circuit comprising; a first charging path disposed between the power source and the power storage, the first charging path limiting the current in a predetermined range; a second charging path disposed between the power source and the power storage unit; a voltage detector for detecting a voltage level of the power storage unit and selectively switching the first charging path and the second charging path to charge the power storage unit; wherein when the voltage level of the power storage unit is lower than a threshold voltage, switching to the first charging path for the power source charging the power storage unit via the first charging path; when the voltage level of the power storage unit is higher or equal to the threshold voltage, switching to the second charging path for the power source charging the power storage unit via the second charging path. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification