UN-INTERRUPTIBLE POWER SUPPLY
First Claim
1. An un-interruptible power supply coupled to receive a dc input voltage at a dc input voltage node referenced to a first reference potential node, and to provide an isolated output dc voltage referenced to a second reference potential node to a load comprising:
- a mode control circuit coupled to monitor the dc input voltage and to provide a mode selection signal having a first state in response to the dc input voltage exceeding a first voltage level and a second state in response to the dc input voltage passing below a second voltage level, a high frequency transformer having at least a primary winding, an output winding and a charger winding, a battery having a battery voltage at a battery first terminal measured with respect to a battery second terminal, the battery second terminal being coupled to a third reference potential node, an input inverter referenced to the first reference potential node and coupled to transfer power from the dc input voltage, to provide pulse width modulated power to the primary winding of the high frequency transformer, an output rectifier and filter driven by the transformer output winding to provide the output dc voltage referenced to the second reference potential node, an adaptive converter referenced to the third reference potential node and coupled to the transformer charger winding for charging the battery in response to the mode selection signal first state to transfer power from the battery to the transformer charger winding to provide the output dc voltage source in response to the mode selection signal second state.
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Accused Products
Abstract
An un-interruptible power supply coupled to a dc input voltage node, having a mode control circuit to monitors the input voltage and to provide a mode selection signal to indicate that the input voltage is above a predetermined level. A high frequency transformer has a primary winding, an output winding and a charger winding. A battery is referenced to a third reference potential node. An input inverter transfers power from the dc input voltage to an output rectifier and to an adaptive converter to charge a battery. The output rectifier and filter provides the output dc voltage referenced to the second reference potential node. The adaptive converter referenced to the third reference potential transfer power from the battery to the transformer charger winding to provide the output dc voltage source.
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Citations
18 Claims
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1. An un-interruptible power supply coupled to receive a dc input voltage at a dc input voltage node referenced to a first reference potential node, and to provide an isolated output dc voltage referenced to a second reference potential node to a load comprising:
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a mode control circuit coupled to monitor the dc input voltage and to provide a mode selection signal having a first state in response to the dc input voltage exceeding a first voltage level and a second state in response to the dc input voltage passing below a second voltage level, a high frequency transformer having at least a primary winding, an output winding and a charger winding, a battery having a battery voltage at a battery first terminal measured with respect to a battery second terminal, the battery second terminal being coupled to a third reference potential node, an input inverter referenced to the first reference potential node and coupled to transfer power from the dc input voltage, to provide pulse width modulated power to the primary winding of the high frequency transformer, an output rectifier and filter driven by the transformer output winding to provide the output dc voltage referenced to the second reference potential node, an adaptive converter referenced to the third reference potential node and coupled to the transformer charger winding for charging the battery in response to the mode selection signal first state to transfer power from the battery to the transformer charger winding to provide the output dc voltage source in response to the mode selection signal second state. - View Dependent Claims (2)
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3. An un-interruptible power supply coupled to receive a dc input voltage at a dc input voltage node referenced to a first reference potential node, and to provide an isolated output dc voltage referenced to a second reference potential node to a load comprising:
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a mode control circuit coupled to monitor the dc input voltage and to provide a mode selection signal having a first state in response to the dc input voltage exceeding a first voltage level and a second state in response to the dc input voltage passing below a second voltage level, a high frequency transformer having at least a primary winding, an output winding and a charger winding, a battery having a battery voltage at a battery first terminal measured with respect to a battery second terminal, the battery second terminal being coupled to a third reference potential node, an input inverter control circuit referenced to the third reference potential node and coupled to sense the battery voltage on the battery first terminal and a predetermined battery reference voltage and to provide an input PWM (pulse width modulated) signal referenced to third reference potential and having a duty cycle characterized to increase for a sensed battery voltage having a value less than a predetermined battery voltage measured with respect to the third reference potential, and decrease for a sensed battery voltage having a value more than the predetermined battery potential, an input inverter referenced to the first reference potential node and coupled to transfer power from the dc input voltage, the input inverter being responsive to the input PWM signal to provide pulse width modulated power to the primary winding of the high frequency transformer, an output rectifier and filter driven by the transformer output winding to provide the output dc voltage referenced to the second reference potential node, an adaptive converter referenced to the third reference potential node and coupled to the transformer charger winding for charging the battery in response to the mode selection signal first state to transfer power from the battery to the transformer charger winding to provide the output dc voltage source in response to the mode selection signal second state. - View Dependent Claims (4)
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5. An un-interruptible power supply coupled to receive a dc input voltage at a do input voltage node referenced to a first reference potential node, and to provide an isolated output dc voltage referenced to a second reference potential node to a load comprising:
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a mode control circuit coupled to monitor the dc input voltage and to provide a mode selection signal having a first state in response to the dc input voltage exceeding a first voltage level and a second state in response to the dc input voltage passing below a second voltage level, a high frequency transformer having at least a primary winding, an output winding and a charger winding, a battery having a battery voltage at a battery first terminal measured with respect to a battery second terminal, the battery second terminal being coupled to a third reference potential node, an input inverter referenced to the first reference potential node and coupled to transfer power from the do input voltage, to provide pulse width modulated power to the primary winding of the high frequency transformer, an output rectifier and filter driven by the transformer output winding to provide the output do voltage referenced to the second reference potential node, a battery inverter control circuit referenced to the second reference potential and coupled to sense the isolated output dc voltage and a predetermined output reference voltage to provide a battery PWM (pulse width modulated) signal having a duty cycle characterized to increase for a sensed isolated output dc voltage having a value less than a predetermined output reference voltage, and decrease for a sensed isolated output dc voltage having a value more than the predetermined output reference voltage, an adaptive converter referenced to the third reference potential node and coupled to the transformer charger winding for charging the battery in response to the mode selection signal first state and being coupled to transfer power from the battery to the transformer charger winding to provide the output dc voltage source in response to the mode selection signal second state. - View Dependent Claims (6)
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7. An un-interruptible power supply coupled to receive a dc input voltage at a dc input voltage node referenced to a first reference potential at a first reference potential node, and to provide an isolated output dc voltage referenced to a second reference potential node to a load comprising:
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a mode control circuit coupled to monitor the dc input voltage and to provide a mode selection signal having a first state in response to the dc input voltage exceeding a first voltage level and a second state in response to the dc input voltage passing below a second voltage level, a high frequency transformer having at least a primary winding, an output winding and a charger winding, a battery having a battery voltage at a battery first terminal measured with respect to a battery second terminal, the battery second terminal being coupled to a third reference potential node, an input inverter control circuit referenced to the third reference potential node and coupled to sense the battery voltage on the battery first terminal and a predetermined battery reference voltage and to provide an input PWM (pulse width modulated) signal referenced to the third reference potential and having a duty cycle characterized to increase for a sensed battery voltage having a value less than a predetermined battery voltage measured with respect to the third reference potential, and decrease for a sensed battery voltage having a value more than the predetermined battery voltage measured with respect to the third reference potential, an input inverter referenced to the first reference potential node and coupled to transfer power from the do input voltage, the input inverter being responsive to the input PWM signal to provide pulse width modulated power to the primary winding of the high frequency transformer, an output rectifier and filter driven by the transformer output winding to provide the isolated output dc voltage referenced to the second reference potential node, a battery inverter control circuit referenced to the second reference potential and coupled to sense the isolated output dc voltage and a predetermined output reference voltage to provide a battery PWM (pulse width modulated) signal having a duty cycle characterized to increase for a sensed isolated output dc voltage having a value less than a predetermined output reference voltage, and decrease for a sensed isolated output dc voltage having a value more than the predetermined output reference voltage, an adaptive converter referenced to the third reference potential node and coupled to the transformer charger winding for charging the battery in response to the first mode selection signal first state and being coupled to receive and being responsive to the battery PWM drive signal to transfer power from the battery to the transformer charger winding to provide the isolated output dc voltage source in response to a mode selection signal second state. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification