POWER SWITCH CIRCUIT AND POWER SUPPLY SYSTEM USING THE SAME
First Claim
1. A power switch circuit for switching from a power supply to another power supply, comprising:
- a voltage divider circuit for generating a divided voltage according to a received signal;
a first reference voltage circuit for generating a first reference voltage;
a second reference voltage circuit for generating a second reference voltage;
a first compare circuit, connected to the voltage divider circuit and the first reference voltage circuit respectively, for comparing the divided voltage with the first reference voltage and generating a first comparison result;
a second compare circuit, connected to the voltage divider circuit and the second reference voltage circuit respectively, for comparing the divided voltage with the second voltage and generating a second comparison result;
a synthesizing circuit, connected to the first compare circuit and the second compare circuit respectively, for synthesizing the first comparison result and the second comparison result and generating a synthesized signal; and
a switch circuit, connected to the synthesizing circuit, for switching on/off according to the synthesized signal.
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Accused Products
Abstract
A power switch circuit (400) includes a voltage divider circuit (401), a first reference voltage circuit (402), a second reference voltage circuit (403), a first compare circuit (404), a second compare circuit (405), a synthesizing circuit (406), and a switch circuit (407). The voltage divider circuit generates a divided voltage. The first reference voltage circuit and the second reference voltage circuit respectively generate a first reference voltage and a second reference voltage. The first compare circuit compares the first reference voltage with the divided voltage and generates a first comparison result. The second comparing circuit compares the second reference voltage with the divided voltage and generates a second comparison result. The synthesizing circuit synthesizes the first comparison result and the second comparison result, and generates a synthesized signal. The switch circuit switches on/off according to the synthesized signal.
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Citations
15 Claims
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1. A power switch circuit for switching from a power supply to another power supply, comprising:
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a voltage divider circuit for generating a divided voltage according to a received signal;
a first reference voltage circuit for generating a first reference voltage;
a second reference voltage circuit for generating a second reference voltage;
a first compare circuit, connected to the voltage divider circuit and the first reference voltage circuit respectively, for comparing the divided voltage with the first reference voltage and generating a first comparison result;
a second compare circuit, connected to the voltage divider circuit and the second reference voltage circuit respectively, for comparing the divided voltage with the second voltage and generating a second comparison result;
a synthesizing circuit, connected to the first compare circuit and the second compare circuit respectively, for synthesizing the first comparison result and the second comparison result and generating a synthesized signal; and
a switch circuit, connected to the synthesizing circuit, for switching on/off according to the synthesized signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power supply system for supplying power to a central office terminal (COT), comprising:
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a direct current (DC) power source for providing a power supply to the COT;
an alternating current (AC) power source;
an adaptor, connected to the AC power source, for converting an AC signal received from the AC power source to a DC signal adapted to the COT;
wherein both the AC power source and the adaptor provide a second power supply;
a power switch circuit, connected between the DC power source and the adaptor, for switching from the power supply to the another power supply, comprising;
a voltage divider circuit for generating a divided voltage according to a received signal;
a first reference voltage circuit for generating a first reference voltage;
a second reference voltage circuit for generating a second reference voltage;
a first compare circuit, connected to the voltage divider circuit and the first reference voltage circuit respectively, for comparing the divided voltage with the first reference voltage and generating a first comparison result;
a second compare circuit, connected to the voltage divider circuit and the second reference voltage circuit respectively, for comparing the divided voltage with the second voltage and generating a second comparison result;
a synthesizing circuit, connected to the first compare circuit and the second compare circuit respectively, for synthesizing the first comparison result and the second comparison result and generating a synthesized signal; and
a switch circuit, connected to the synthesizing circuit, for switching on/off according to the synthesized signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification