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Gas discharge lamp operating circuit computes primary circuit demand current value giving optimal lamp drive from actual current, supply voltage and transfer device efficiency
Gas discharge lamp operating circuit computes primary circuit demand current value giving optimal lamp drive from actual current, supply voltage and transfer device efficiency
The circuit has a drive arm containing a transfer device (2) and the lamp (3) and a feedback arm (4-6) containing a feedback controller for acting on the lamp's electrical drive, for which purpose the feedback controller receives the actual primary circuit (2.1-2.3) current and a measure of the supply voltage (UB) for the transfer device. The feedback controller has a microcomputer (4) that receives the primary circuit actual current (IIST) and the measure of the supply voltage and defines a transfer device efficiency parameter. The microcomputer computes a demand current value (ISOLL) giving an optimal lamp drive based on the actual current, supply voltage and efficiency value.
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