High-efficiency adaptive DC/AC converter
AssigneeO2 International Limited
InventorYung-Lin Lin
Life of this patent
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Abstract
A CCFL power converter circuit is provided using a high-efficiency zero-voltage-switching technique that eliminates switching losses associated with the power MOSFETs. An optimal sweeping-frequency technique is used in the CCFL ignition by accounting for the parasitic capacitance in the resonant tank circuit. Additionally, the circuit is self-learning and is adapted to determine the optimum operating frequency for the circuit with a given load. An over-voltage protection circuit can also be provided to ensure that the circuit components are protected in the case of open-lamp condition.
Claims14
1-60. (canceled)
A DC to AC inverter circuit, comprising:
- an input voltage source;
- a plurality of switches being selectively coupled to said voltage source;
- a transformer having a primary side and a secondary side, said primary side being selectively coupled to said voltage source in an alternating fashion through said switches;
- a load coupled to said secondary side of said transformer;
- and
- a feedback control loop circuit receiving a feedback signal indicative of power being supplied to the load and adapted to control the conduction state of at least one of said switches so that said switches have a plurality of conduction states comprising a first state in which said switches deliver an amount of power to said load determined by said feedback signal, and a second state in which said switches deliver a predetermined minimum power to the load.
An inverter circuit for converting a DC voltage source to an AC voltage source to power a load, comprising:
- a plurality of switches being selectively coupled to said DC voltage source;
- and
- a feedback control loop circuit receiving a feedback signal indicative of power being supplied to said load and adapted to control the conduction state of at least one of said switches so that said switches have a conduction state in which said switches deliver an amount of power to said load determined by said feedback signal when said feedback signal is greater than a predetermined threshold.
A DC to AC inverter circuit comprising:
- a plurality of switches being controlled in an alternating fashion;
- and
- a feedback control loop circuit receiving a feedback signal indicative of power being supplied to a load and adapted to control the conduction state of at least one of said switches so that said switches have a conduction state to deliver a predetermined minimum power to the load.
An inverter circuit comprising:
- a plurality of switches being controlled in an alternating fashion;
- and
- a feedback control loop circuit receiving a feedback signal indicative of power being supplied to a load and adapted to control the conduction state of at least one of said switches so that said switches have overlapping conduction states, said overlapping conduction states comprise a first state in which said switches deliver an amount of power to said load determined by said feedback signal when said feed back signal is greater than a predetermined threshold;
- and a second state in which said switches deliver a predetermined minimum power to the load.
Dependencies are inferred from the claim text.