Uninterruptible power supply
First Claim
1. An apparatus for supplying continuous output power from at least one of two sources of input power comprising;
- rectification means for converting an input alternating current from a first source of input power, into a first unidirectional current, said first unidirectional current varying in magnitude with time;
first sense means responsive to the voltage provided by said first source of input power for providing a first control signal when the voltage provided by said first source of input power is within a predetermined range of voltages and providing a second control signal when the voltage provided by said first source of input power is at a voltage other than a voltage within said predetermined range of voltages, said second control signal inhibiting said rectification means for providing said first unidirectional current;
inverter means for converting an input direct current from a second source of input power into a second unidirectional current, said second unidirectional current varying in magnitude with time;
second sense means responsive to said first and second control signals for providing a third control signal to said inverter means so as to control the time-varying magnitude of said second unidirectional current provided by said inverter means, said second sense means in response to said first control signal providing said third control signal so as to limit the magnitude of said second unidirectional current to a magnitude substantially less than said first unidirectional current and said second sense means in response to said second control signal providing said third control signal so as to control the magnitude of said second unidirectional current to a magnitude sufficient to maintain continuous output power; and
demodulator means for converting at least one of said first or second unidirectional currents into a continuous output alternating current so as to maintain continuous output power.
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Accused Products
Abstract
A method and apparatus for supplying continuous output power from at least one of two sources of input power. A rectifier circuit rectifies an AC current from an AC power source into a DC current. A first sensing circuit respectively provides first and second control signals in response to the input voltage provided by the AC power source. The first control signal is provided when the AC power source voltage is within a predetermined voltage range. The second control signal is provided when the AC power source voltage is outside the predetermined voltage range so as to inhibit the rectification of the AC current. An inverter circuit converts a DC current from a DC power source into an AC current which is then rectified into a DC current. A second sensing current, responsive to the first and second control signals, generates a third control signal which controls the magnitude of the output of the inverter circuit. A demodulator circuit converts the DC currents from the rectifier circuit and the inverter circuit into a continuous output AC current.
13 Citations
22 Claims
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1. An apparatus for supplying continuous output power from at least one of two sources of input power comprising;
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rectification means for converting an input alternating current from a first source of input power, into a first unidirectional current, said first unidirectional current varying in magnitude with time; first sense means responsive to the voltage provided by said first source of input power for providing a first control signal when the voltage provided by said first source of input power is within a predetermined range of voltages and providing a second control signal when the voltage provided by said first source of input power is at a voltage other than a voltage within said predetermined range of voltages, said second control signal inhibiting said rectification means for providing said first unidirectional current; inverter means for converting an input direct current from a second source of input power into a second unidirectional current, said second unidirectional current varying in magnitude with time; second sense means responsive to said first and second control signals for providing a third control signal to said inverter means so as to control the time-varying magnitude of said second unidirectional current provided by said inverter means, said second sense means in response to said first control signal providing said third control signal so as to limit the magnitude of said second unidirectional current to a magnitude substantially less than said first unidirectional current and said second sense means in response to said second control signal providing said third control signal so as to control the magnitude of said second unidirectional current to a magnitude sufficient to maintain continuous output power; and demodulator means for converting at least one of said first or second unidirectional currents into a continuous output alternating current so as to maintain continuous output power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An uninterruptible power supply for supplying continuous output power from at least one of two sources of input power, comprising:
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a first four-terminal switching network having first and second terminals for receiving an input alternating current from a first source of input power and third and fourth terminals for outputting a first unidirectional current having a waveform coresponding to a full wave rectification of the waveform of said input alternating current, including; (a) first switch means responsive to a first switch signal for electrically connecting said first terminal to said third terminal, (b) second switch means responsive to said first switch signal for electrically connecting said second terminal to said fourth terminal, (c) third switch means responsive to a second switch signal for electrically connecting said first terminal to said fourth terminal, and (d) fourth switch means responsive to said second switch signal for electrically connecting said second terminal and said third terminal; conversion means coupled to said first and second terminals for providing an input reference signal representative of the voltage provided by said first source of input power; reference means coupled to one of said first and second terminals for generating a pair of internal reference signals, said pair of reference signals have a waveform phase-locked with the waveform of the voltage provided by said first source of input power; first comparison means coupled to said reference means and said conversion means for comparing said input reference signal with one of said internal reference signals and generating a first control signal when said input reference signal has a first predetermined relationship with one of said internal said reference signals and generating a second control signal when said input reference signal has a second predetermined relationship with said one of said internal reference signals; first switch signal means coupled to said reference means, said first comparison means, and said first switching network for generating said first and second switch signals in response to the other of said internal reference signals, said first signal means inhibited from generating said first and second switch signals in response to said second control signal; second switch signal means coupled to said reference means for generating third and fourth switch signals in response to said other of said internal reference signals; a second four-terminal switching network, coupled to said second switch means, having fifth and sixth terminals electrically connected to said third and fourth terminals and seventh and eight terminals for outputting a continuous output alternating current, including; (a) fifth switch means responsive to said third switch signal for electrically connecting said fifth terminal to said seventh terminal, (b) sixth switch means responsive to said third switch signal for electrically connecting said sixth terminal to said eighth terminal, (c) seventh switch means responsive to said fourth switch signal for electrically connecting said fifth terminal to said eighth terminal, and (d) eigth switch means responsive to said fourth switch signal for electrically connecting said sixth terminal to said seventh terminal; second comparison means coupled to said second switching network and said reference means for comparing said one of said internal reference signals with a reference voltage representative of the voltage corresponding to at least one of said first or a second unidirectional currents and for generating a third control signal; modulating means coupled to said first and second comparison means for providing a fourth control signal in response to said third control signal, said modulating means responsive to said first control signal for modifying said fourth control signal so as to restrict the magnitude of said second unidirectional current; third switch signal means coupled to said modulating means for generating fifth and sixth switch signals in response to said fourth control signal; first electromagnetic coupling emans coupled to said third switch means for receiving said input direct current from said second source of input power and for converting said input direct current into electromagnetically induced pulses of energy in response to said fifth and sixth switch signals; and conditioning means coupled to said electromagnetic converting means and said third and fourth terminals for converting said electromagnetically induced pulses of energy into said second unidirectional current. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method for supplying continuous output power from at least one of two sources of input power comprising the steps of:
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rectifying an input alternating current from a first source of input power into a first unidirectional current, said first unidirectional current varying in magnitude with time; generating a reference signal in response to said input alternating current; generating a first control signal when the voltage provided by said first source of input power is within a predetermined range of voltages; generating a second control signal when the voltage provided by said first source of input power is at a voltage other than a voltage within said predetermined range of voltages; inhibiting said first unidirectional current in response to the generation of said second control signal; converting an input direct current from a second source of input power into a second unidirectional current, said second unidirectional current varying in magnitude with time; restricting the magnitude of said second unidirectional current in response to the generation of said first control signal; and demodulating at least one of said first and second unidirectional currents into a continuous output alternating current so as to maintain continuous output power. - View Dependent Claims (19, 20, 21, 22)
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Specification