Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Patent
1996-07-30
1999-10-12
Kinkead, Arnold
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Transformer in the supply circuit
315DIG4, 315307, 323301, 336155, 363 25, H01F 2742, H05B 4100
Patent
active
059659890
ABSTRACT:
A circuit that senses a current signal in a secondary winding of a transformer by monitoring a current signal in a primary winding of the transformer. The monitored current signal contains an effective current component and a magnetization current component. The magnitude of the effective current signal is related to the magnitude of the current signal in the secondary winding by the turns ratio of the transformer. The magnetization current signal produces flux in the transformer core and does not contribute to producing current in the secondary winding of the transformer. In addition, the magnetization current is 90 degrees out of phase with the effective current signal in the primary winding. The effective current signal in the primary winding is in phase with the voltage signal applied to the primary winding. The invention integrates the monitored current signal over 0 degrees to 180 degrees of the effective current signal waveform. Since the magnetization current signal is 90 degrees out of phase with the effective current signal, the magnetization current signal component is cancelled from the monitored current signal by the integration operation. Therefore, the result of the integration operation is representative of a current signal in the secondary winding of the transformer and does not contain error caused by the magnetization current of the transformer. The result of the integration operation is used in a feedback loop to control the current in the secondary winding. In a preferred embodiment of the invention, a fluorescent lamp is coupled to the secondary winding of the transformer.
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Kinkead Arnold
Micro Linear Corporation
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