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;
a converter coupled between the output of said inductor and the electrical device, said converter producing line power at an output; and
a combiner having a input coupled to a host power supply and an output coupled to the output of said converter, said combiner supplementing said line power with host power from said host power supply when the voltage level of said line power falls below a predetermined level.
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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.
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Citations
12 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; a converter coupled between the output of said inductor and the electrical device, said converter producing line power at an output; and a combiner having a input coupled to a host power supply and an output coupled to the output of said converter, said combiner supplementing said line power with host power from said host power supply when the voltage level of said line power falls below a predetermined level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification