US5059869A — Circuit arrangement for the operation of high-pre…

Claim 1

Independent Claim 85 words

A circuit arrangement for the operation of at least one high-pressure gas discharge lamp comprising: means coupled to the lamp for supplying the lamp with a pulsatory supply current having a pulse recurrence frequency between 50 and 2000 Hz and a duty cycle between 0.2. and 0.8, and means for superimposing on the pulsatory current a current having a high-frequency between 20 and 200 kHz and with a modulation ratio between 0.3 and 1, the high-frequency being an integral multiple of the pulse recurrence frequency.

Claim 2

Dependent Claim 85 words

A circuit arrangement for the operation of at least one high-pressure gas discharge lamp comprising: means coupled to the lamp for supplying the lamp with a pulsatory supply current having a pulse recurrence frequency between 50 and 2000 Hz and a duty cycle between 0.2. and 0.8, and means for superimposing on the pulsatory current a current having a high-frequency between 20 and 200 kHz and with a modulation ratio between 0.3 and 1, the high-frequency being an integral multiple of the pulse recurrence frequency.

Claim 3

Dependent Claim 142 words

A circuit arrangement for operating at least one high-pressure gas discharge lamp comprising: a pair of input terminals for connection to a source of direct voltage, a ballast inductor, a controlled electronic switching device, means for connecting the ballast inductor, the electronic switching device and the lamp in a series circuit across said pair of input terminals, and a control device having an output coupled to a control electrode of the electronic switching device and arranged to trigger the electronic switching device on and off so as to provide the lamp with a pulsatory supply current having a pulse recurrence frequency between 50 Hz and 2000 Hz, a duty cycle between 0.2 and 0.8, and with a high-frequency current at a frequency between 20 KHz and 200 KHz superimposed on the pulsatory current and having a modulation ratio between 0.3 and 1.

Claim 4

Dependent Claim 142 words

A circuit arrangement for operating at least one high-pressure gas discharge lamp comprising: a pair of input terminals for connection to a source of direct voltage, a ballast inductor, a controlled electronic switching device, means for connecting the ballast inductor, the electronic switching device and the lamp in a series circuit across said pair of input terminals, and a control device having an output coupled to a control electrode of the electronic switching device and arranged to trigger the electronic switching device on and off so as to provide the lamp with a pulsatory supply current having a pulse recurrence frequency between 50 Hz and 2000 Hz, a duty cycle between 0.2 and 0.8, and with a high-frequency current at a frequency between 20 KHz and 200 KHz superimposed on the pulsatory current and having a modulation ratio between 0.3 and 1.

Claim 5

Dependent Claim 68 words

A circuit arrangement as claimed in claim 2, wherein the control device comprises: a high-frequency generator having an output connected to a frequency divider which produces from a high-frequency output signal of said high-frequency generator a further signal varying at the pulse recurrence frequency, and a monostable trigger device connected to an output of the frequency divider and adapted to adjust the duty cycle of said further signal.

Claim 6

Dependent Claim 33 words

A circuit arrangement as claimed in claim 2, wherein said control device further comprises means for setting said high-frequency current to a frequency that is an integral multiple of the pulse recurrence frequency.

Claim 7

Independent Claim 92 words

A method of operating a high-pressure gas discharge lamp with a pulsatory supply current comprising: energizing said high pressure discharge lamp with a low frequency pulse type supply current at a pulse recurrence frequency between 50 Hz and 2000 Hz and with a duty cycle between 0.2 and 0.8, and superimposing on the low frequency pulse type supply current a high-frequency current at a frequency between 20 KHz and 200 KHz and with a modulation ratio between 0.3 and 1, said high frequency being an integral multiple of the pulse recurrence frequency.

Claim 8

Independent Claim 92 words

A method of operating a high-pressure gas discharge lamp with a pulsatory supply current comprising: energizing said high pressure discharge lamp with a low frequency pulse type supply current at a pulse recurrence frequency between 50 Hz and 2000 Hz and with a duty cycle between 0.2 and 0.8, and superimposing on the low frequency pulse type supply current a high-frequency current at a frequency between 20 KHz and 200 KHz and with a modulation ratio between 0.3 and 1, said high frequency being an integral multiple of the pulse recurrence frequency.

Claim 9

Dependent Claim 65 words

A circuit arrangement as claimed in claim 3 further comprising means connecting the output of the high-frequency generator to a clock input (b) of a bistable trigger stage and an output of the monostable trigger device to a conditioning input (a) of the bistable trigger stage, and means connecting an output of the bistable trigger stage to the control electrode of the electronic switching device.

Claim 10

Dependent Claim 63 words

A circuit arrangement as claimed in claim 6 further comprising means for connecting a current measuring resistor in series with the high-pressure gas discharge lamp, a comparator having a first input connected to the measuring resistor and a second input to a reference voltage source, and means connecting an output of the comparator to a reset input (c) of the bistable trigger stage.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1994-10-21	1995-04-22	1995-10-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1998-10-21	1999-04-22	1999-10-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2002-10-21	2003-04-22	2003-10-22	$7700.00	Window Closed / Lapsed

Circuit arrangement for the operation of high-pressure gas discharge lamps by means of a pulsatory supply current

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