Single stage converter in LCD backlight inverter
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorByoung Own Min
Life of this patent
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Abstract
Disclosed is about a single stage converter in an LCD backlight inverter which is embodied into an integrated circuit and has an individual circuit structure for converting DC current into AC current. The single stage converter in the LCD backlight inverter of the invention is embodied as an ASIC to realize an individual application circuit, replaces conventional two-stage articles to reduce the size, enhances the efficiency and reduces the part number thereby saving the cost for materials.
Claims6
A single stage converter in an LCD backlight inverter which includes powering passage alternating means connected between a supply voltage input terminal and a transformer for alternating a power supply passage into the first side of the transformer to allow transformation in the transformer and a plurality of lamps connected to an output terminal of the transformer, the single stage converter comprising:
- transformer controlling means for receiving a feedback current from the output terminal of the transformer and flowing through the lamps in the size of a stable voltage, comparing the feedback current with a dimming signal and comparing a compared value thereof with a periodically generated triangle wave to control the operation of the powering passage alternating means so as to control the operation of the transformer;
- shut-down judging means for receiving the feedback current from the output terminal of the transformer and flowing through the lamps in the size of a stable voltage and comparing the feedback current with a reference voltage to compare the size of the current flowing through the lamps so as to judge whether a shut-down takes place;
- and
- stabilizing means for receiving a supply voltage inputted through the supply voltage input terminal and comparing the supply voltage with the reference voltage to judge whether the supply voltage is in an overvoltage state so as to recognize the supply voltage as in the overvoltage state, and if it is judged that the shut-down generation judging means judges that the shut-down occurs, providing a judgment signal into the transformer controlling means to adaptively correspond to the shut-down or the overvoltage state.
A single stage converter in an LCD backlight inverter which includes powering passage alternating means connected between a supply voltage input terminal and a transformer for alternating a power supply passage into the first side of the transformer to allow transformation in the transformer and a plurality of lamps connected to an output terminal of the transformer, the single stage converter comprising:
- transformer controlling means for receiving a feedback current from the output terminal of the transformer and flowing through the lamps in the size of a stable voltage, comparing the feedback current with a dimming signal and comparing a compared value thereof with a periodically generated triangle wave to control the operation of the powering passage alternating means so as to control the operation of the transformer;
- shut-down judging means for receiving the feedback current from the output terminal of the transformer and flowing through the lamps in the size of a stable voltage and comparing the feedback current with a reference voltage to compare the size of the current flowing through the lamps so as to judge whether a shut-down takes place;
- and
- stabilizing means for receiving a supply voltage inputted through the supply voltage input terminal and comparing the supply voltage with the reference voltage to judge whether the supply voltage is in an overvoltage state so as to recognize the supply voltage as in the overvoltage state, and if it is judged that the shut-down generation judging means judges that the shut-down occurs, providing a judgment signal into the transformer controlling means to adaptively correspond to the shut-down or the overvoltage state,
- wherein the transformer controlling means, the shut-down judging means and the stabilizing means are embodied in one chip.
Dependencies are inferred from the claim text.