Balancing transformers for ring balancer
First Claim
1. A balancer for current sharing among multiple loads in a parallel configuration, the balancer comprising a plurality of balancing transformers, each of the balancing transformers designated for a particular load, and each of the balancing transformers comprising a magnetic core, a primary winding to be inserted in series with its designated load, and a secondary winding, wherein the plurality of primary winding and designated load combinations are connected in parallel for coupling to a common power source and the secondary windings of the balancer are serially coupled in a closed loop to conduct a common current and wherein at least two of the balancing transformers have different turns ratios.
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Accused Products
Abstract
A ring balancer comprising a plurality of balancing transformers facilitates current sharing in a multi-lamp backlight system. The balancing transformers have respective primary windings separately coupled in series with designated lamps and have respective secondary windings coupled together in a closed loop. The secondary windings conduct a common current and the respective primary windings conduct proportional currents to balance currents among the lamps. The ring balancer facilitates automatic lamp striking and the lamps can be advantageously driven by a common voltage source.
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Citations
20 Claims
- 1. A balancer for current sharing among multiple loads in a parallel configuration, the balancer comprising a plurality of balancing transformers, each of the balancing transformers designated for a particular load, and each of the balancing transformers comprising a magnetic core, a primary winding to be inserted in series with its designated load, and a secondary winding, wherein the plurality of primary winding and designated load combinations are connected in parallel for coupling to a common power source and the secondary windings of the balancer are serially coupled in a closed loop to conduct a common current and wherein at least two of the balancing transformers have different turns ratios.
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8. A method to control current ratios among multiple parallel loads, the method comprising the steps of:
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providing a balancing transformer for each load; coupling each load in series with a primary winding of the corresponding balancing transformer, wherein the primary winding and load combinations are coupled in parallel; and coupling secondary windings of the balancing transformers in a serial loop to conduct a common current, wherein at least two of the balancing transformers have different turns ratios such that the primary windings of the respective balancing transformers conduct unequal currents. - View Dependent Claims (9, 10, 11)
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12. A method to produce a ring balancer, the method comprising the acts of:
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providing a plurality of toroidal magnetic cores to correspond to a plurality of balancing transformers; winding an insulated wire progressively on a section of each toroidal magnetic core to correspond to primary windings for the respective balancing transformers, wherein each of the primary windings is configured for coupling in series with a separate load and the combinations of primary winding and separate load are coupled in parallel for current balancing; and looping an insulated wire through the plurality of toroidal magnetic cores to correspond to single turn secondary windings connected in a closed loop. - View Dependent Claims (13)
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- 14. A ring balancer comprising means for passively controlling current ratios of multiple parallel loads using a plurality of transformers with respective secondary windings connected in a short circuit loop and respective primary windings individually coupled to different loads, wherein the primary winding and load combinations are coupled in parallel to a common source and at least two of the transformers have different turns ratios.
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17. A balancer for current sharing among multiple loads, the balancer comprising:
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a plurality of balancing transformers with respective primary windings and respective secondary windings, each of the primary windings coupled in series with a different load and the plurality of secondary windings coupled serially in a closed loop; and a fault detection circuit configured to sense a voltage rise in one or more of the secondary windings to determine presence of a non-operational load and to generate a fault signal. - View Dependent Claims (18, 19, 20)
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Specification