Uninterruptible power supply with power factor correction
First Claim
1. An electrical power supply comprising:
- a rectifying circuit coupled to receive AC power and generate a DC voltage signal in response thereto;
a boost converter coupled to receive the DC voltage signal and a first voltage feedback signal and generate a boost voltage signal in response thereto that is controlled to maintain the first voltage feedback signal at a selected magnitude;
a converter circuit coupled to receive the boost voltage signal as a primary input signal, generate a secondary signal in response to the primary input signal, generate the first voltage feedback signal to represent the voltage of the secondary signal and generate at least one regulated output voltage signal as an output;
an output voltage controller coupled to receive the at least one regulated voltage signal and to control the converter circuit to maintain the at least one regulated output voltage signal at a predetermined voltage; and
an auxiliary energy source coupled to supply electrical energy to the converter circuit when the rectifying circuit fails to receive AC power.
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Accused Products
Abstract
An energy efficient uninterruptible regulated power supply includes a full wave rectifier that is responsive to AC main power generating an unregulated DC voltage signal, a power factor correcting boost converter coupled to receive and selectively increase the unregulated voltage signal to generate a boosted voltage signal, a battery and a single ended forward converter having a primary winding coupled to receive pulse width modulated energy from the boosted voltage signal and a secondary winding couple bidirectionally to the battery with pulse width modulated control. A first controller pulse width modulates the boosted voltage and battery signals coupled to the primary and secondary windings, respectively, to regulate the output voltage while a second controller operates independently of the first controller pulse width modulate the boost converter to regulate the voltage of a transformer secondary signal that is coupled to the battery.
55 Citations
20 Claims
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1. An electrical power supply comprising:
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a rectifying circuit coupled to receive AC power and generate a DC voltage signal in response thereto; a boost converter coupled to receive the DC voltage signal and a first voltage feedback signal and generate a boost voltage signal in response thereto that is controlled to maintain the first voltage feedback signal at a selected magnitude; a converter circuit coupled to receive the boost voltage signal as a primary input signal, generate a secondary signal in response to the primary input signal, generate the first voltage feedback signal to represent the voltage of the secondary signal and generate at least one regulated output voltage signal as an output; an output voltage controller coupled to receive the at least one regulated voltage signal and to control the converter circuit to maintain the at least one regulated output voltage signal at a predetermined voltage; and an auxiliary energy source coupled to supply electrical energy to the converter circuit when the rectifying circuit fails to receive AC power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electrical power supply comprising:
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an electrical power transformer having a primary winding and a secondary winding; a boost converter coupled to receive power from a main power supply and a secondary voltage signal that is representative of a voltage at the secondary winding of the power transformer and generate a boost voltage signal controlled to provide a selected peak voltage at the secondary winding of the transformer; a voltage feedback circuit coupled to the secondary winding to the power transformer and generating the secondary voltage signal; an output filter coupled to filter a power signal received from the secondary transformer winding to generate a regulated output voltage signal having a regulated voltage; a primary power switch coupled in series with the primary winding; and an output voltage controller coupled to generate an output pulse width modulation control signal, the output pulse width modulation control signal being coupled to control the primary power switch to control a flow of current from the boost voltage signal through the transformer primary winding with an active duty cycle portion selected to maintain the output signal at the regulated voltage. - View Dependent Claims (12, 13)
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14. An electrical power supply providing a continuous, seamless transition between operation in response to a main power source and operation in response to an auxiliary power supply having an output voltage, the power supply comprising:
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at a rectifier coupled to generate a DC voltage signal in response to the main power supply; at a power transformer having a primary winding and a secondary winding; a primary power switch coupled in series with the primary winding and the DC voltage signal; an auxiliary power switch coupled for series connection between the secondary winding and the auxiliary power supply to form a bidirectionally conductive path between the auxiliary power supply and the secondary winding when the switch is closed an the auxiliary power supply is installed; a filter coupled to generate an output voltage signal in response to the secondary winding; and an output voltage controller coupled to receive an indication of the output voltage signal and generate an output pulse width modulation control signal having an active duty cycle portion that is controlled to maintain the output voltage signal at a selected magnitude, the output pulse width modulation control signal being coupled to control both the auxiliary power switch and the primary power switch. - View Dependent Claims (15)
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16. A process of generating regulated DC voltage signal comprising:
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generating an intermediate electrical signal having a voltage controlled to match a voltage of an auxiliary electrical power source; coupling an auxiliary power source to the intermediate electrical signal; filtering the intermediate electrical signal to generate an output signal; and pulse width modulating the intermediate electrical signal to regulate the voltage of the output signal. - View Dependent Claims (17, 18)
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19. A process of generating a regulated DC voltage signal comprising:
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rectifying an AC power signal to generate a DC voltage signal; boosting the DC voltage signal to a voltage that is controlled to provide an intermediate voltage signal at a selected magnitude; coupling an auxiliary power source to the intermediate voltage signal through a conductive path that permits a bidirectional flow of current between the auxiliary power source and the intermediate voltage signal; and pulse width modulating the intermediate voltage signal with an active cycle portion that is controlled to maintain the output signal at a predetermined voltage. - View Dependent Claims (20)
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Specification