Telephone line-powered power supply for ancillary equipment and method of operation thereof
First Claim
1. A telephone line-powered power supply, comprising:
- a transformer having a primary winding and a secondary winding; and
an energy storage device series-coupled directly to said primary winding, said primary winding and said energy storage device adapted to be coupled to, and provide a terminating resistance for, a telephone line, a node between said primary winding and said energy storage device providing DC power.
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Accused Products
Abstract
A telephone line-powered power supply, a method of operating the same and telephone line-powered ancillary equipment. In one embodiment, the power supply includes: (1) a transformer having a primary winding and a secondary winding and (2) an energy storage device (which may, but is not required to, be a capacitor) series-coupled to the primary winding, the primary winding and the energy storage device adapted to be coupled to, and provide a terminating resistance for, a telephone line. A node between the primary winding and the energy storage device provides DC power. Another embodiment employs a control switch to regulate an energy storage device, thereby dispensing with a need for the transformer.
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Citations
39 Claims
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1. A telephone line-powered power supply, comprising:
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a transformer having a primary winding and a secondary winding; and
an energy storage device series-coupled directly to said primary winding, said primary winding and said energy storage device adapted to be coupled to, and provide a terminating resistance for, a telephone line, a node between said primary winding and said energy storage device providing DC power. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of supplying power to ancillary equipment from a telephone line, comprising:
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terminating said telephone line with a transformer and energy storage device directly coupled in series, said transformer having a primary winding and a secondary winding; and
deriving DC power for said ancillary equipment from a node between said primary winding and said energy storage device. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. Telephone line-powered ancillary equipment, comprising:
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a power supply, including;
a transformer having a primary winding and a secondary winding, and an energy storage device series-coupled directly to said primary winding, said primary winding and said energy storage device adapted to be coupled to, and provide a terminating resistance for, a telephone line; and
a load, coupled to a node between said primary winding and said energy storage device to derive DC power from said power supply. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A telephone line-powered power supply, comprising:
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a control switch;
an energy storage device parallel-coupled to said control switch;
resistors, coupled to said control switch and said energy storage device, that controls said control switch based on a voltage of said energy storage device to regulate said voltage, wherein said resistors are sufficiently sized not to affect an impedance of said telephone line; and
a terminating impedance, coupled to said control switch, that provides a terminating resistance for said telephone line. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A method of supplying power to ancillary equipment from a telephone line, comprising:
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activating a control switch;
charging an energy storage device parallel-coupled to said control switch;
controlling said control switch employing resistors coupled to said energy storage device and said control switch based on a voltage of said energy storage device to regulate said voltage, wherein said resistors are sufficiently sized not to affect an impedance of said telephone line; and
providing a terminating resistance for said telephone line. - View Dependent Claims (29, 30, 31, 32, 33)
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34. Telephone line-powered ancillary equipment, comprising:
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a power supply, including;
a control switch, an energy storage device parallel-coupled to said control switch, resistors, coupled to said control switch and said energy storage device, that controls said control switch based on a voltage of said energy storage device to regulate said voltage, wherein said resistors are sufficiently sized not to affect an impedance of a telephone line, and a terminating impedance, coupled to said control switch, that provides a terminating resistance for said telephone line; and
a load, coupled to said energy storage device to derive DC power from said power supply. - View Dependent Claims (35, 36, 37, 38, 39)
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Specification