Charger
First Claim
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1. An uninterruptible power supply (UPS), comprising:
- (a) a transformer having a primary winding and a secondary winding;
(b) a low voltage converter (02) comprising a battery providing a DC voltage operatively coupled to a primary winding of said transformer, whereby a first AC voltage differential is generated across the secondary winding of said transformer;
(c) a high voltage inverter (01) comprising first and second load terminals adapted to be coupled across a load in an emergency situation;
a transistor Q1 and another transistor Q2, wherein said transistors Q1 and Q2 are switchable from conducting to non-conducting states and vice versa so as to produce an output voltage waveform across said load terminals when a load is coupled thereto, said output voltage being characterized by an amplitude that varies between a positive peak (V) and a negative peak (-V); and
(d) coupled inductor means (60) comprising a first winding (63) operatively coupled to said battery, and at least a second winding (61,
62) operatively coupled to said high voltage inverter, wherein said first and second windings are wound around a common core.
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Abstract
An uninterruptible power supply (UPS) comprises a low voltage converter (02); a coupled inductor (60) comprising a first inductor (63) coupled to the battery, a second inductor (61) coupled to a first output terminal of a rectifier, and a third inductor (62) coupled to a second output terminal of the rectifier; a snubber circuit; and a high voltage inverter (01).
19 Citations
48 Claims
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1. An uninterruptible power supply (UPS), comprising:
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(a) a transformer having a primary winding and a secondary winding; (b) a low voltage converter (02) comprising a battery providing a DC voltage operatively coupled to a primary winding of said transformer, whereby a first AC voltage differential is generated across the secondary winding of said transformer; (c) a high voltage inverter (01) comprising first and second load terminals adapted to be coupled across a load in an emergency situation;
a transistor Q1 and another transistor Q2, wherein said transistors Q1 and Q2 are switchable from conducting to non-conducting states and vice versa so as to produce an output voltage waveform across said load terminals when a load is coupled thereto, said output voltage being characterized by an amplitude that varies between a positive peak (V) and a negative peak (-V); and(d) coupled inductor means (60) comprising a first winding (63) operatively coupled to said battery, and at least a second winding (61,
62) operatively coupled to said high voltage inverter, wherein said first and second windings are wound around a common core. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An uninterruptible power supply (UPS), comprising:
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(a) a transformer having a primary winding and a secondary winding; (b) a low voltage converter (02) comprising a battery providing a DC voltage, a first switching device (Q3), a second switching device (Q4), and first drive means (41,
42) for driving said switching devices from a conducting state to a non-conducting state and vice versa;wherein said first switching device is operatively coupled to a first terminal of said primary winding of said transformer, said second switching device is operatively coupled to a second terminal of said primary winding, and said battery is operatively coupled to a third terminal of said primary winding, whereby a first AC voltage differential is generated across the secondary winding of said transformer; (c) a rectifier, having first and second output terminals (12,
14), for converting said first AC voltage across the secondary winding to a first high DC voltage (V) at said first output terminal and a second high DC voltage (-V) at said second output terminal;(d) coupled inductor means (60) comprising a first winding (63) operatively coupled to said battery, a second winding (61) operatively coupled to said first output terminal of said rectifier, and a third winding (62) operatively coupled to said second output terminal of said rectifier, wherein said first, second and third windings are wound around a common core; (e) a snubber circuit operatively coupled to said second and third inductors; and (f) a high voltage inverter (01) comprising first and second load terminals adapted to be coupled across a load in an emergency situation;
a third switching device (Q1) and a fourth switching device (Q2), and second drive means (43,
44) for driving said third and fourth switching devices from conducting to non-conducting states, and vice versa, so as to produce a quasi-square output voltage waveform across said load terminals when a load is coupled thereto, said output voltage being characterized by an amplitude that varies between a positive peak (V) and a negative peak (-V). - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An uninterruptible power supply (UPS) for generating an AC voltage across a load, the UPS comprising:
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a transformer having a primary winding and a secondary winding; an inverter circuit, configured to connect to a DC power source, coupled to said primary winding, and operative to couple the DC power source to said primary winding and thereby generate an AC voltage on said secondary winding from the DC power source in a first mode and to decouple the DC power source from said primary winding in a second mode; and a converter/charger circuit coupled to said secondary winding, configured to connect to an AC power source, said converter/charger circuit including a first inductor coupled to said secondary winding and a second inductor inductively coupled to the first inductor and configured to connect to the DC power source, said converter/charger circuit operative to produce the AC output voltage from the AC voltage generated by said inverter circuit in the first mode, to produce the AC output voltage from the AC power source in a second mode, and to couple said secondary winding to the first inductor in at least one of said first and second modes such that energy is transferred from said secondary winding to the DC power source through the first and second coupled inductors. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A power supply comprising:
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a transformer having a primary winding and a secondary winding configured to connect to a first terminal of a load; a first inverter circuit, coupled to said primary winding and configured to connect to a battery, that applies a DC voltage generated by the battery to said primary winding in alternating polarity to produce a first AC voltage on said secondary winding; a rectifier circuit, coupled to said secondary winding, that rectifies the first AC voltage to produce first and second rectified DC voltages at respective first and second output terminals thereof; and a second inverter circuit, coupled to said rectifier circuit and configured to connect to a second terminal of the load, that alternately couples said first and second output terminals of said rectifier circuit to the second terminal of the load at a first frequency to produce a second AC voltage across the load, wherein said first inverter circuit decouples said primary winding from the DC power source when said second inverter circuit switches connections between the second terminal of the load and said first and second output terminals of said rectifier; and a charging circuit configured to connect to the battery and operative to provide a charging current thereto. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method of generating an AC voltage across a load from a DC voltage produced by a DC power source, the method comprising the steps of:
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applying the DC voltage to first end terminal of a primary winding of a transformer in alternating polarity to generate a first AC voltage on a secondary winding of the transformer, the secondary winding having a center terminal connected to a first terminal of the load; applying the first AC voltage to a rectifier to produce first and second rectified DC voltages at first and second output terminals of the rectifier; alternately coupling the first and second output terminals of the rectifier to a second terminal of the load at a first frequency to produce a second AC voltage across the load; and decoupling said primary winding from the DC power source when switching the second terminal of the load between the first and second output terminals of the rectifier. - View Dependent Claims (47, 48)
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Specification