Boost-input backed-up uninterruptible power supply
First Claim
1. A boost-input backed-up uninterruptible power supply powered from an input voltage source for providing an uninterrupted output voltage to a load connected to a return, the boost-input backed-up uninterruptible power supply comprising:
- an input rectifier coupled to the input voltage source for converting the input voltage source into at least a substantially unfiltered unregulated positive dc voltage source and a substantially unregulated unfiltered negative dc voltage source, each respective unregulated voltage source providing a respective unregulated dc voltage with respect to the return;
a battery means for providing respective positive and negative battery voltages at corresponding positive and negative battery output terminals;
a current switch means for isolating the unregulated positive and negative dc voltage sources from their respective battery voltages and for providing respective unregulated dc voltages equal to or greater than their respective battery voltage and for clamping each respective unregulated dc voltage to its respective battery voltage in response to loss of the input voltage source;
a boost regulator means coupled to receive power from the unregulated positive and negative dc voltage sources for providing a positive and a negative regulated dc voltage with respect to the return;
a dc-to-ac converter means responsive to a reference signal and coupled to convert the positive and negative regulated dc voltage into at least a first uninterrupted output voltage having an amplitude proportional to the reference signal for application to the load, said uninterrupted output voltage being sampled and scaled to provide an output voltage sense signal, the output voltage sense signal being combined with the reference signal to provide an amplified error signal, the dc-to-ac converter being responsive to the amplified error signal to adjust and scale the output voltage to minimize the amplified error signal.
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Accused Products
Abstract
A boost-input backed-up uninterruptable power supply from an input voltage source, such as a 60 cycle 120/240 Vac service, provides an uninterrupted output voltage to a load connected to a return. The backed-up power supply has an input rectifier and low energy storage filter coupled to the input voltage source for converting the input voltage source into at least an unregulated positive dc voltage source, and an unregulated negative dc voltage source. Each respective unregulated source has a respective unregulated dc voltage value with respect to the return. Two 120V battery stacks provides respective positive and negative battery voltages at corresponding positive and negative battery output terminals. A diode isolates the unregulated positive and negative dc voltage sources from their respective battery voltages for unregulated voltage source values equal to or greater than their respective battery voltages and clamps the unregulated dc voltage values to their respective battery voltages in response to loss of the sinusoidal input voltage source. A boost regulator receives power from the unregulated positive and negative dc voltage sources and provides a positive and a negative regulated dc voltage with respect to the return. A dc-to-ac converter receives a reference signal and converts the positive and negative regulated dc voltage into at least a first uninterrupted output voltage for application to the load.
166 Citations
16 Claims
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1. A boost-input backed-up uninterruptible power supply powered from an input voltage source for providing an uninterrupted output voltage to a load connected to a return, the boost-input backed-up uninterruptible power supply comprising:
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an input rectifier coupled to the input voltage source for converting the input voltage source into at least a substantially unfiltered unregulated positive dc voltage source and a substantially unregulated unfiltered negative dc voltage source, each respective unregulated voltage source providing a respective unregulated dc voltage with respect to the return; a battery means for providing respective positive and negative battery voltages at corresponding positive and negative battery output terminals; a current switch means for isolating the unregulated positive and negative dc voltage sources from their respective battery voltages and for providing respective unregulated dc voltages equal to or greater than their respective battery voltage and for clamping each respective unregulated dc voltage to its respective battery voltage in response to loss of the input voltage source; a boost regulator means coupled to receive power from the unregulated positive and negative dc voltage sources for providing a positive and a negative regulated dc voltage with respect to the return; a dc-to-ac converter means responsive to a reference signal and coupled to convert the positive and negative regulated dc voltage into at least a first uninterrupted output voltage having an amplitude proportional to the reference signal for application to the load, said uninterrupted output voltage being sampled and scaled to provide an output voltage sense signal, the output voltage sense signal being combined with the reference signal to provide an amplified error signal, the dc-to-ac converter being responsive to the amplified error signal to adjust and scale the output voltage to minimize the amplified error signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A boost-input backed-up uninterruptible power supply powered from a sinusoidal input voltage source for providing an uninterrupted sinusoidal output voltage to a load, the power supply comprising:
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an input rectifier coupled to the sinusoidal input voltage source to convert the input voltage source into at least a substantially unfiltered unregulated positive dc voltage source and a substantially unfiltered unregulated negative dc voltage source, each respective unregulated dc voltage source providing a respective unregulated dc voltage with respect to a return; a positive boost inductor having an input terminal coupled to the unregulated positive dc voltage source and an output terminal; a positive boost capacitor having a first terminal coupled to the return and a second terminal coupled to a positive regulated voltage terminal; a positive boost clamp diode having a cathode coupled to the positive regulated voltage terminal and an anode coupled to the positive boost inductor output terminal; a first transistor switching means having a control grid responsive to a first pulse width modulated boost control signal and a conduction channel for coupling the positive boost inductor output terminal to the return terminal in response to the first pulse width modulated boost control signal assuming a first state and for opening the conduction channel in response to the first pulse width modulated boost control signal assuming a second state; a first pulse width modulated control circuit means responsive to a positive regulated dc voltage and to the unregulated positive dc voltage source for producing the first pulse width modulated boost control signal for driving the positive regulated dc voltage to a predetermined level; a negative boost inductor having an input terminal coupled to the unregulated negative dc voltage source and an output terminal; a negative boost capacitor having a first terminal coupled to the return and a second terminal coupled to a negative regulated voltage terminal; a negative boost clamp diode having an anode coupled to the negative regulated voltage terminal and a cathode coupled to the negative boost inductor output terminal; a second transistor switching means having a control grid responsive to a second pulse width modulated boost control signal and a conduction channel for coupling the negative boost inductor output terminal to the return terminal in response to the second pulse width modulated boost control signal assuming a first state and for opening the conduction channel in response to the second pulse width modulated boost control signal assuming a second state; a second pulse width modulated control circuit means responsive to the negative regulated dc voltage and to the unregulated negative dc voltage source for producing the second pulse width modulated boost control signal for driving the negative regulated dc voltage to a predetermined level; a first battery for providing a positive battery voltage at a first battery positive output terminal with respect to the return; a second battery for providing a negative battery voltage at a second battery negative output terminal with respect to the return; a positive current switch interposed between the first battery positive output terminal and the positive filter inductor output terminal for isolating the unregulated positive dc voltage source from the first battery positive battery terminal for unregulated positive dc voltage source values equal to or greater than the positive battery voltage and for clamping the unregulated positive dc voltage to the positive battery voltage in response to loss of the input voltage source; a negative current switch interposed between the second battery negative battery output terminal and the negative filter inductor output terminal for isolating the unregulated negative dc voltage source from the second battery negative battery terminal for unregulated negative dc voltage source values having an absolute value equal to or greater than the absolute value of the negative battery voltage and for clamping the unregulated negative dc voltage value to the negative battery voltage in response to loss of the input voltage source; and a dc-to-ac converter coupled to convert the positive regulated dc voltage and the negative regulated dc voltage into at least a first uninterrupted sinusoidal output voltage for application to the load. - View Dependent Claims (10)
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11. A boost-input backed-up uninterruptible power supply powered from a sinusoidal input voltage source for providing an uninterrupted sinusoidal output voltage to a load connected to a return, the boost-input backed-up uninterruptible power supply comprising:
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an input rectifier coupled to the input voltage source and converting the input voltage source into at least an unregulated and substantially unfiltered positive dc voltage source and a substantially unfiltered unregulated negative dc voltage source, each respective unregulated voltage source having a respective unregulated dc voltage value with respect to the return; a positive boost inductor having an input terminal coupled to the unregulated positive voltage source, and an output terminal, a single boost inductor being connected to the input terminal; a negative boost inductor having an input terminal coupled to the unregulated negative voltage source and an output terminal a single boost inductor being connected to the input terminal; a positive battery referenced to the return for providing a positive battery voltage at a positive battery output terminal; a positive battery clamp diode having a cathode connected to the positive filter inductor output terminal and its anode connected to the positive battery positive battery output terminal; and
,a negative battery referenced to the return for providing a negative battery voltage at a negative battery output terminal; a negative battery clamp diode having an anode connected to the negative filter inductor output terminal and its cathode connected to the negative battery, negative positive battery output terminal; and
, a boost regulator coupled to receive power from the unregulated positive and negative dc voltage sources and providing a positive and a negative regulated dc voltage with respect to the return; anda dc-to-ac converter responsive to a reference signal and coupled to convert the positive and negative regulated dc voltage into at least a first uninterrupted sinusoidal output voltage having an amplitude continuously proportional to a reference signal. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification