Power supply and method that maintains supply voltage in communications systems during a power supply interruption
First Claim
1. A power supply comprising:
- a power supply converter having a power output and configured to provide a supply voltage through the power output to a communications device; and
a boost circuit connected to the power supply converter in parallel and isolated from the power supply converter'"'"'s bulk input capacitance during normal operation and further comprising at least one power storage circuit and charging circuit connected thereto and configured to charge and maintain the power storage circuit to a predetermined voltage and switch the power storage circuit into the power supply converter during an undervoltage condition to transfer the stored power from the power storage circuit to the power supply converter and maintain the supply voltage to the communications device connected thereto for a required hold-up time, wherein said power supply converter further comprises a circuit connected to the boost circuit and configured to generate a signal as a switching stimulus to the boost circuit to drive the boost circuit.
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Accused Products
Abstract
A power supply and associated method include a power supply converter having a power output and configured to provide a supply voltage through the power output to a communications device. A simplified boost circuit is connected to the power supply converter in parallel but isolated from the power supply converter'"'"'s bulk input capacitance during normal operation. The boost circuit includes at least one power storage circuit and a charging circuit connected thereto and configured to charge and maintain the power storage circuit to a predetermined voltage and switch the power storage circuit into the power supply converter during an undervoltage condition to transfer the stored power from the power storage circuit to the power supply converter and maintain the supply voltage to the communications device connected thereto for a required hold-up time.
18 Citations
17 Claims
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1. A power supply comprising:
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a power supply converter having a power output and configured to provide a supply voltage through the power output to a communications device; and a boost circuit connected to the power supply converter in parallel and isolated from the power supply converter'"'"'s bulk input capacitance during normal operation and further comprising at least one power storage circuit and charging circuit connected thereto and configured to charge and maintain the power storage circuit to a predetermined voltage and switch the power storage circuit into the power supply converter during an undervoltage condition to transfer the stored power from the power storage circuit to the power supply converter and maintain the supply voltage to the communications device connected thereto for a required hold-up time, wherein said power supply converter further comprises a circuit connected to the boost circuit and configured to generate a signal as a switching stimulus to the boost circuit to drive the boost circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for maintaining power to a communications load during a power supply interruption, comprising;
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powering a communications load at a predetermined supply voltage from a power supply converter connected to the communications load; maintaining a predetermined voltage at a boost circuit operating parallel to the power supply converter during normal operation; switching the boost circuit into the power supply converter during an undervoltage condition to transfer the stored power from the boost circuit'"'"'s reservoir capacitor to the power supply converter and maintain the supply voltage to the communications load for a required hold-up time; and generating a signal as a switching stimulus from the power supply converter to drive the boost circuit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A power supply comprising:
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a power supply converter having a power output and configured to provide a supply voltage through the power output to a communications device; and a boost circuit connected to the power supply converter in parallel and isolated from the power supply converter'"'"'s bulk input capacitance during normal operation and further comprising at least one power storage circuit and charging circuit connected thereto and configured to charge and maintain the power storage circuit to a predetermined voltage and switch the power storage circuit into the power supply converter during an undervoltage condition to transfer the stored power from the power storage circuit to the power supply converter and maintain the supply voltage to the communications device connected thereto for a required hold-up time, wherein the power supply converter comprises a Pulse Width Modulation (PWM) circuit connected to the boost circuit and configured to share its PWM signal with the boost circuit and eliminate the need for a dedicated boost supply controller.
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17. A method for maintaining power to a communications load during a power supply interruption, comprising;
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powering a communications load at a predetermined supply voltage from a power supply converter connected to the communications load; maintaining a predetermined voltage at a boost circuit operating parallel to the power supply converter during normal operation; switching the boost circuit into the power supply converter during an undervoltage condition to transfer the stored power from the boost circuit'"'"'s reservoir capacitor to the power supply converter and maintain the supply voltage to the communications load for a required hold-up time; and using the power supply converter'"'"'s Pulse Width Modulated (PWM) signal as the switching stimulus for the boost circuit.
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Specification