Method for the operation of and circuit arrangement for light sources
View Patent ↗A method for the closed-loop control of the operation of a light source which is supplied with power by a DC/DC voltage converter, a manipulated variable being regulated by a setpoint value for an operational parameter of the DC/DC voltage converter being input, wherein the method comprises the steps of: increasing the switching frequency of the DC/DC voltage converter by an increase value prior to rapid changes in the setpoint value; waiting for a retention time; setting the new setpoint value; waiting for the end of a total retention time; and lowering the switching frequency of the DC/DC voltage converter by the increase value.
1. A method for the closed-loop control of the operation of a light source which is supplied with power by a DC/DC voltage converter, a manipulated variable being regulated by a setpoint value for an operational parameter of the DC/DC voltage converter being input,
wherein the method comprises the steps of:
increasing the switching frequency of the DC/DC voltage converter by an increase value prior to rapid changes in the setpoint value;
waiting for a retention time;
setting a new setpoint value;
waiting for the end of a total retention time; and
lowering the switching frequency of the DC/DC voltage converter by the increase value.
2. The method as claimed in claim 1 , wherein the setting of the new setpoint value is performed during the retention time.
3. The method as claimed in claim 1 , wherein the setting of the new setpoint value is performed during the total retention time.
4. The method as claimed in claim 1 , wherein the light source is operated on a square-wave current.
5. The method as claimed in claim 1 , wherein the rapid changes in the setpoint value are the polarity reversal of the light source current.
6. The method as claimed in claim 1 , wherein the light source is operated on a direct current.
7. The method as claimed in claim 1 , wherein the rapid changes in the setpoint value are the beginning or the end of a maintenance pulse for a gas discharge lamp.
8. The method as claimed in claim 1 , wherein the rapid changes in the setpoint value are the beginning or the end of a color wheel section, by means of which the light source current is synchronized.
9. The method as claimed in claim 1 , while it is operated at a first frequency, the DC/DC voltage converter is in intermittent—respectively, operating mode or at intermittent—respectively, between the intermittent and non-intermittent operating modes.
10. The circuit arrangement as claimed in claim 9 , wherein the light source is a gas discharge lamp.
11. The circuit arrangement as claimed in claim 9 , wherein the light source is a semiconductor light source.
12. The method as claimed in claim 1 , wherein the DC/DC voltage converter transfers to a non-intermittent operating mode when it is operated at the increased frequency.
13. A circuit arrangement for operating light sources, having a DC/DC voltage converter and a control circuit, using a method as claimed in claim 1 .