Circuit and method of igniting a high-pressure lamp
First Claim
1. An electronic circuit for igniting a high-pressure lamp, comprising resonant circuit (13) for providing an ignition voltage for the high-pressure lamp;
- a converter (12) for generating an alternating voltage with which the resonant circuit (13) is excited;
an oscillator (14, 16, 17) for driving the converter (12), the fundamental frequency of the output voltage of the oscillator (14, 16, 17) lying at least in proximity to an integral fraction of the resonance frequency of the resonant circuit (13), and a feedback (17) from the resonant circuit (13) to the oscillator (14, 16, 17), whereby the fundamental frequency of the output voltage of the oscillator (14, 16, 17) is so tuned that the resulting frequency of the output voltage of the oscillator (14, 16, 17) corresponds substantially exactly to the integral fraction of the resonance frequency in proximity to which the fundamental frequency of the output voltage of the oscillator (14, 16, 17) lies.
1 Assignment
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Accused Products
Abstract
The invention relates to an electronic circuit for igniting a high-pressure lamp. A resonant circuit 13 of the circuit is used to supply the ignition voltage for the high-pressure lamp. To enable an exact adjustment of the resonance frequency in the resonant circuit, it is proposed that the circuit also comprises converter 12 for generating an alternating voltage with which the resonant circuit 13 is excited and an oscillator 14, 16, 17 for driving the converter 12, the fundamental frequency of the output voltage of the oscillator being at least in proximity to an integral fraction of the resonance frequency of the resonant circuit 13. Finally, it is proposed that the circuit includes a feedback 17 from the resonant circuit 13 to the oscillator 14, 16, 17, whereby the fundamental frequency of the output voltage of the oscillator is so tuned that the resulting frequency of the output voltage of the oscillator corresponds substantially exactly to the integral fraction of the resonance frequency. The invention also relates to a corresponding lighting installation and a corresponding method.
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Citations
12 Claims
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1. An electronic circuit for igniting a high-pressure lamp, comprising
resonant circuit (13) for providing an ignition voltage for the high-pressure lamp; -
a converter (12) for generating an alternating voltage with which the resonant circuit (13) is excited;
an oscillator (14, 16, 17) for driving the converter (12), the fundamental frequency of the output voltage of the oscillator (14, 16, 17) lying at least in proximity to an integral fraction of the resonance frequency of the resonant circuit (13), and a feedback (17) from the resonant circuit (13) to the oscillator (14, 16, 17), whereby the fundamental frequency of the output voltage of the oscillator (14, 16, 17) is so tuned that the resulting frequency of the output voltage of the oscillator (14, 16, 17) corresponds substantially exactly to the integral fraction of the resonance frequency in proximity to which the fundamental frequency of the output voltage of the oscillator (14, 16, 17) lies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of igniting a high-pressure lamp by means of a resonant circuit (13) supplied with an alternating voltage by an converter (12), the method comprising the following steps:
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a) driving of the converter (12) by a voltage which is output by an oscillator (14, 16, 17) such that the converter (12) outputs an alternating voltage, the fundamental frequency of the output voltage of the oscillator (14, 16, 17) lying at least in proximity to a fraction of the resonance frequency of the resonant circuit (13);
b) supplying of the alternating voltage output by the converter (12) to the resonant circuit (13) so as to excite an oscillation in the resonant circuit (13);
c) feeding the oscillation caused in the resonant circuit (13) back to the oscillator (14, 16, 17), such that the frequency of the output voltage of the oscillator (14, 16, 17) is adjusted to a value which corresponds substantially exactly to the fraction of the resonance frequency of the resonant circuit in proximity to which the fundamental frequency of the output voltage of the oscillator (14, 16, 17) lies, and d) repetition of steps a) to c) until a voltage required for ignition of the high-pressure lamp is attained at the resonant circuit (13). - View Dependent Claims (12)
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Specification