Telephone line power supply
First Claim
1. A power supply circuit for powering an electrical device using power from a telephone line, said circuit comprising:
- a gyrator having an input coupled to the telephone line and an output;
an inductor having and input and an output;
an oscillator having an output;
a pulse circuit coupled to said oscillator and coupled between the output of said gyrator and the input of said inductor; and
a converter coupled between the output of said inductor and the electrical device, said converter producing line power at an output.
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Accused Products
Abstract
A telephone line driven power supply and power supply method capable of creating high yield, low voltage power using power drawn from a telephone line and supplementing the low voltage power with power from a battery-powered host device, such as a laptop PC, when the voltage level falls below a predetermined voltage level. The telephone line power supply includes a polarity guard, a gyrator, an oscillator, a pulse circuit, an inductor, a startup circuit, a converter, a shunt regulator, and a combiner circuit. The method includes supplying line power from power drawn from a telephone line, receiving host power from a host device, supplying the line power to an electrical device, and supplementing the line power with the host power when the voltage level of the line power falls below a predetermined level.
54 Citations
22 Claims
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1. A power supply circuit for powering an electrical device using power from a telephone line, said circuit comprising:
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a gyrator having an input coupled to the telephone line and an output;
an inductor having and input and an output;
an oscillator having an output;
a pulse circuit coupled to said oscillator and coupled between the output of said gyrator and the input of said inductor; and
a converter coupled between the output of said inductor and the electrical device, said converter producing line power at an output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 19, 20)
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14. A power supply element for use with a power supply circuit and a host power supply, said element comprising:
a combiner coupled between the power supply circuit and the host power supply, said combiner supplementing line power from the power supply circuit with host power from the host power supply when the voltage level of the line power from the power supply circuit falls below a predetermined level.
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18. A telephone line powered modem for coupling to a telephone line, said telephone line powered modem for use with a host power supply supplying host power, said modem comprising:
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a power supply circuit for supplying line power used to power the telephone line powered modem from power drawn from the telephone line; and
a combiner coupled between said power supply circuit and the host power supply, said combiner supplementing said line power with the host power when the voltage level of said line power falls below a predetermined level.
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21. A method for powering an electrical device within a host device coupled to a telephone line, said host device having a host power supply, said method comprising the steps of:
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supplying line power from power drawn from the telephone line;
receiving host power from the host power supply;
supplying said line power to the electrical device; and
supplementing said line power supplied to the electrical device with said host power when the voltage level of said line power falls below a predetermined level. - View Dependent Claims (22)
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Specification