A method and a circuit arrangement for operating a high intensity discharge lamp
A method and a circuit arrangement ( 1 ) for operating a high intensity discharge lamp ( 2 ), which is supplied by direct current (DC) supply lines ( 4, 6 ), comprising a transformer ( 40 ), of which a primary winding ( 42 ) is connected in series with an inductor ( 46 ) and a capacitor ( 48 ) to th...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | A method and a circuit arrangement ( 1 ) for operating a high intensity discharge lamp ( 2 ), which is supplied by direct current (DC) supply lines ( 4, 6 ), comprising a transformer ( 40 ), of which a primary winding ( 42 ) is connected in series with an inductor ( 46 ) and a capacitor ( 48 ) to the DC supply lines ( 4, 6 ), a secondary winding ( 44 ) of the transformer is connected in series with the lamp, a switch ( 52 ) is connected in parallel to the capacitor ( 48 ), and a control circuit ( 56 ) is connected to the switch ( 52 ), whereby the control circuit ( 56 ) controls the switch to conduct upon detecting a zero crossing of a voltage (Vsw) at the switch, and the control circuit controls the switch to not conduct upon detecting a value of a current through the switch which is greater than a reference value. |
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