Discharge lamp control circuit with feedback loop to lower harmonic distortion
First Claim
1. A circuit arrangement for operating a discharge lamp with a high frequency current, comprising:
- input terminals for connection to a source of low frequency supply voltage,rectifier means coupled to said input terminals for rectifying said low frequency supply voltage,a first circuit comprising a series arrangement of first unidirectional means, second unidirectional means and first capacitive means coupled to a first output terminal of said rectifier means and to a second output terminal of said rectifier means,inverter means shunting said first capacitive means for generating the high frequency current,a load circuit comprising a series arrangement of inductive means, second capacitive means and means for applying a voltage to the discharge lamp, said load circuit connecting a terminal of said inverter means to a first terminal between the first unidirectional means and the second unidirectional means, and a second circuit comprising third capacitive means for connecting the first terminal to the second output terminal, andwherein the first output terminal of the rectifier means is connected to a second terminal between the second unidirectional means and the first capacitive means by means of a third circuit comprising a series arrangement of third unidirectional means and fourth unidirectional means, and a third terminal between said third unidirectional means and said fourth unidirectional means is connected to a terminal that is part of the load circuit by means of a fourth circuit, and in that neither the first circuit nor the third circuit comprises inductive means.
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Accused Products
Abstract
A circuit arrangement for operating a discharge lamp with a high frequency current comprising input terminals for connection to a source of low frequency supply voltage, a rectifier bridge coupled to the input terminals for rectifying the low frequency supply voltage, and an inverter shunting a first capacitor for generating the high frequency current. The circuit arrangement incorporates two power feedback loops to feed power back to an output terminal of the rectifier bridge. As a result the circuit arrangement has a relatively simple configuration, causes only a very limited amount of harmonic distortion and can be realized with relatively cheap and simple components.
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Citations
15 Claims
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1. A circuit arrangement for operating a discharge lamp with a high frequency current, comprising:
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input terminals for connection to a source of low frequency supply voltage, rectifier means coupled to said input terminals for rectifying said low frequency supply voltage, a first circuit comprising a series arrangement of first unidirectional means, second unidirectional means and first capacitive means coupled to a first output terminal of said rectifier means and to a second output terminal of said rectifier means, inverter means shunting said first capacitive means for generating the high frequency current, a load circuit comprising a series arrangement of inductive means, second capacitive means and means for applying a voltage to the discharge lamp, said load circuit connecting a terminal of said inverter means to a first terminal between the first unidirectional means and the second unidirectional means, and a second circuit comprising third capacitive means for connecting the first terminal to the second output terminal, and wherein the first output terminal of the rectifier means is connected to a second terminal between the second unidirectional means and the first capacitive means by means of a third circuit comprising a series arrangement of third unidirectional means and fourth unidirectional means, and a third terminal between said third unidirectional means and said fourth unidirectional means is connected to a terminal that is part of the load circuit by means of a fourth circuit, and in that neither the first circuit nor the third circuit comprises inductive means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A circuit arrangement for operating a discharge lamp with a high frequency current, comprising:
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input terminals for connection to a source of low frequency supply voltage, rectifier means coupled to said input terminals for rectifying said low frequency supply voltage, a first circuit comprising a series arrangement of first unidirectional means, second unidirectional means and first capacitive means coupled to a first output terminal of said rectifier means and to a second output terminal of said rectifier means, inverter means shunting said first capacitive means for generating the high frequency current, a load circuit comprising a series arrangement of inductive means, second capacitive means and means for applying a voltage to the discharge lamp, said load circuit connecting a terminal of said inverter means to a first terminal between the first unidirectional means and the second unidirectional means, a second circuit comprising third capacitive means and said first capacitive means for connecting the first terminal to the second output terminal, and wherein the first output terminal of the rectifier means is connected to a second terminal between the second unidirectional means and the first capacitive means by means of a third circuit comprising a series arrangement of third unidirectional means and fourth unidirectional means, and a third terminal between said third unidirectional means and said fourth unidirectional means is connected to a terminal that is part of the load circuit by means of a fourth circuit. - View Dependent Claims (15)
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Specification