Power source circuit apparatus for electro-luminescence device
First Claim
1. An electro-luminescence device lighting inverter comprising:
- a DC-DC step-up circuit for boosting an input voltage to an electro-luminescence device lighting DC voltage, an oscillation frequency of said DC-DC step-up circuit being set to be higher than an audible frequency; and
a DC-AC converter for converying a DC output from said DC-DC step-up circuit into an AC output of the electro-luminescence device lighting DC voltage;
whereinsaid DC-AC converter is provided with an electro-luminescence device lighting oscillation circuit for oscillating a lighting signal having a predetermined frequency, and a switching circuit, controlled in response to the lighting signal from said electro-luminescence device lighting oscillation circuit, for converting a DC output from said DC-DC step-up circuit into the AC output;
said switching circuit includes transistors ON/OFF-controlled in response to the lighting signal from said electro-luminescence device lighting oscillation circuit; and
said AC output is supplied to the electro-luminescence device via a reactor connected in series with said electro-luminescence device to form a series resonance circuit generating a resonance voltage with a frequency lower than the predetermined frequency of the lighting signal.
1 Assignment
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Accused Products
Abstract
A low DC voltage supplied to a low DC voltage receiving terminal is converted into a high DC voltage by a DC-DC step-up circuit. The obtained high DC voltage has an optimal value for driving an electro-luminescence device. This high DC volatage is converted into an AC voltage through a pair of series-connected transistors in a switching circuit ON/OFF-controlled in response to an oscillation output from a multivibrator. The converted voltage is supplied to the electro-luminescence device through a series resonance circuit including the electro-luminescence device and a reactor as an AC drive voltage. At this time, a resonance voltage is fed back to the multivibrator and the switching circuit so as to obtain an appropriate luminance correction capability.
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Citations
8 Claims
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1. An electro-luminescence device lighting inverter comprising:
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a DC-DC step-up circuit for boosting an input voltage to an electro-luminescence device lighting DC voltage, an oscillation frequency of said DC-DC step-up circuit being set to be higher than an audible frequency; and a DC-AC converter for converying a DC output from said DC-DC step-up circuit into an AC output of the electro-luminescence device lighting DC voltage;
whereinsaid DC-AC converter is provided with an electro-luminescence device lighting oscillation circuit for oscillating a lighting signal having a predetermined frequency, and a switching circuit, controlled in response to the lighting signal from said electro-luminescence device lighting oscillation circuit, for converting a DC output from said DC-DC step-up circuit into the AC output; said switching circuit includes transistors ON/OFF-controlled in response to the lighting signal from said electro-luminescence device lighting oscillation circuit; and said AC output is supplied to the electro-luminescence device via a reactor connected in series with said electro-luminescence device to form a series resonance circuit generating a resonance voltage with a frequency lower than the predetermined frequency of the lighting signal. - View Dependent Claims (2, 3, 4)
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5. An electro-luminescence device lighting inverter comprising:
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a DC-DC step-up circuit for boosting an input voltage to an electro-luminescence device lighting DC voltage, an oscillation frequency of said DC-DC step-up circuit being set to be higher than an audible frequency; and a DC-AC converter for converting a DC output from said DC-DC step-up circuit into an AC output of the electro-luminescence device lighting DC voltage;
whereinsaid DC-AC converter is provided with an electro-luminescence device lighting oscillation circuit for oscillating a lighting signal having a predetermined frequency, and a switching circuit, controlled in response to the lighting signal from said electro-luminescence device lighting oscillation circuit, for converting a DC output from said DC-DC step-up circuit into the AC output; said switching circuit includes transistors ON/OF-controlled in response to the lighting signal from said electro-luminescence device lighting oscillation circuit; said transistors of said switching circuit are connected in series with each other, and are connected across output terminals of said DC-DC step-up circuit; and said AC output is supplied to the electro-luminescence device via a reactor connected in series with said electro-luminescence device to form a series resonance circuit generating a resonance voltage with a frequency lower than the predetermined frequency of the lighting signal.
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6. An electro-luminescence lamp driving apparatus comprising:
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A voltage control circuit for changing an input voltage into an electro-luminescence lamp lighting voltage, and converting the electro-luminescence lamp lighting voltage into a DC voltage; and a DC-AC converter for converting the DC voltage from said voltage control circuit into an AC output;
whereinsaid DC-AC converter is provided with an oscillation circuit for oscillating a lighting signal having a predetermined frequency, and an output circuit for power-amplifying the lighting signal from said oscillation circuit; the lighting signal outputted from said oscillation circuit is a rectangular wave voltage; said oscillation circuit includes a specific element having the predetermined frequency of a free-running oscillation; said output circuit includes a switching circuit for performing an ON/OFF operation; said switching circuit of said output circuit is ON/OFF-controlled in response to the rectangular wave voltage which is an output from said oscillation circuit; a series resonance circuit includes a reactor connected in series with the electro-luminescence lamp to form a series resonance circuit connected to an output side of said output circuit as a load to generate a resonance voltage having a frequency different from the predetermined frequency of said oscillation circuit by a given value; and a voltage generating point of said series resonance circuit of said electro-luminescence lamp and said reactor is connected to an input side of said oscillation circuit, and the resonance signal of said resonance circuit is fed back to said oscillation circuit.
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7. An inverter for an electro-luminescence lamp comprising:
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a voltage control circuit for changing an input voltage into an electro-luminescence lamp lighting voltage, and converting the electro-luminescence lamp lighting voltage into a DC voltage; and a DC-AC converter for converting the DC voltage from said voltage control circuit into an AC output;
whereinsaid DC-AC converter is provided with an oscillation circuit for oscillating a lighting signal having a predetermined frequency, and an output circuit for power-amplifying the lighting signal from said oscillation circuit; the lighting signal outputted from said oscillation circuit is a rectangular wave voltage; said oscillation circuit includes a specific element having the predetermined frequency of 200 Hz to 5000 Hz; said output circuit includes a switching circuit for performing an ON/OFF operation; said switching circuit of said output circuit is ON/OFF-controlled in response to the rectangular wave voltage which is an output from said oscillation circuit; a series resonance circuit includes a reactor connected in series with the electro-luminescence lamp to form the series resonance circuit connected to an output side of said output circuit as to load to generate a resonance voltage having a frequency different from the predetermined frequency of said oscillation circuit by a given value; a voltage generating point of said series resonance circuit of said electro-luminescence lamp and said reactor is connected to an input side of said oscillation circuit, and the resonance signal of said resonance circuit is fed back to said oscillation circuit; and the voltage generating point of said series resonance circuit of said electro-luminescence lamp and said reactor is connected to an input side of said oscillation circuit, and the resonance circuit of said electro-luminescence lamp and said reactor is fed back to the input side of said output circuit.
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8. An inverter for lighting an electro-luminescence lamp comprising:
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a DC-DC step-up circuit for boosting an input voltage to an electro-luminescence lamp lighting voltage, and converting the boosted voltage into a DC voltage; and a DC-AC converter for converting a DC output from said DC-DC step-up circuit into an AC output of the electro-luminescence device lighting DC voltage;
whereinsaid AC-DC converter is provided with an electro-luminescence lamp lighting oscillation circuit for oscillating a lighting signal having a predetermined frequency, and an output circuit for power-amplifying the lighting signal from said electro-luminescence lamp lighting oscillation circuit; the lighting signal outputted from said electro-luminescence lamp lighting oscillation circuit is a rectangular wave voltage having an oscillation frequency of 400 Hz to 5000 Hz; said output circuit includes a pair of switching elements for performing an ON/OFF operation; said switching elements are connected in series with each other through diodes; an in-phase rectangular wave voltage is input to said pair of series-connected switching elements, and said switching elements are alternately ON/OFF-controlled in response to the in-phase rectangular wave voltage; a series resonance circuit including a reactor connected in series with said electro-luminescence lamp to form a series resonance circuit generating a resonance voltage with a frequency different from the predetermined frequency of said oscillation circuit; said series resonance circuit of said reactor and said electro-luminescence lamp is connected to an intermediate point between said series-connected switching elements through said diodes; and said diodes connected in series with said switching elements are connected to said switching elements in a forward direction with respect to said switching elements.
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Specification