POWER SUPPLY
First Claim
1. A system comprising:
- a power outage detection circuit which detects that an output voltage of a DC voltage source has been lowered, and outputs a power outage signal;
a battery charger comprising a switching element which adjusts the output voltage generated by the DC voltage source, in performing a switching operation, and is set to be ON KEEP in response to the power outage signal; and
a battery which is charged by the battery charger and supplies the electric power to the load when the switching element is set to be ON KEEP.
2 Assignments
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Accused Products
Abstract
There is provided a power supply capable of reducing switching elements. In a power supply, an AC/DC adapter 121 supplies electric power to a load 125 and a battery charger 122. The battery charger comprises a high side FET 102 and a low side FET 103 which operate according to a synchronous rectification method, and charges batteries 108 and 109. When a commercial power supply fails, a power outage detection circuit provided in the battery charger detects the power outage, and outputs a power outage signal. The battery charger which has received the power outage signal sets the high side FET to be ON KEEP. A discharge current from the battery flows via a discharge path 119. This enables a reduction in the number of FETs in comparison with other power supplies.
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Citations
20 Claims
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1. A system comprising:
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a power outage detection circuit which detects that an output voltage of a DC voltage source has been lowered, and outputs a power outage signal;
a battery charger comprising a switching element which adjusts the output voltage generated by the DC voltage source, in performing a switching operation, and is set to be ON KEEP in response to the power outage signal; and
a battery which is charged by the battery charger and supplies the electric power to the load when the switching element is set to be ON KEEP. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus comprising:
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a power outage detection circuit which detects that an output voltage of a DC voltage source has been lowered, and outputs a power outage signal;
a battery charger comprising a high side FET and a low side FET which operate in a synchronous rectification method, and the high side FET is set to be ON KEEP in response to the power outage signal;
a first charge/discharge path connected to the output of the battery charger;
a second charge/discharge path connected to the output of the battery charger;
a first battery connected to the first charge/discharge path; and
a second battery connected to the second charge/discharge path. - View Dependent Claims (8, 9)
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10. A system comprising:
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an electronic device;
a power outage detection circuit which detects that an output voltage of a DC voltage source has been lowered, and outputs a power outage signal;
a battery charger comprising a switching element which adjusts the output voltage generated by the DC voltage source, in performing a switching operation, and is set to be ON KEEP in response to the power outage signal; and
a battery which is charged by the battery charger and supplies the electric power to the load when the switching element is set to be ON KEEP. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An apparatus comprising:
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an electronic device;
a power outage detection circuit which detects that an output voltage of a DC voltage source has been lowered, and outputs a power outage signal;
a battery charger comprising a high side FET and a low side FET which operate in a synchronous rectification method, and the high side FET is set to be ON KEEP in response to the power outage signal;
a first charge/discharge path connected to the output of the battery charger;
a second charge/discharge path connected to the output of the battery charger;
a first battery connected to the first charge/discharge path; and
a second battery connected to the second charge/discharge path. - View Dependent Claims (17, 18, 19, 20)
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Specification