A signal transmission method and related device for a feedback path of a switched power supply

An electrical power supply device (10), e.g. for LED lighting sources, includes a primary side (12) and a secondary side (14), with the provision of an optocoupler (18) arranged between the primary side (12) and the secondary side (14), adapted to transmit: - a wide band control signal, and - a nume...

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Bibliographische Detailangaben
Hauptverfasser:	BRANCHETTI, FILIPPO, ANGELIN, FRANCESCO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	An electrical power supply device (10), e.g. for LED lighting sources, includes a primary side (12) and a secondary side (14), with the provision of an optocoupler (18) arranged between the primary side (12) and the secondary side (14), adapted to transmit: - a wide band control signal, and - a numerical information signal. The control signal and the information signal are transmitted over a rectangular-wave signal modulated (42) in combination with frequency modulation and pulse width modulation or PWM, wherein the control signal and the information signal are the modulating signal for frequency modulation and pulse width modulation. A signal conditioning circuit (44), e.g. including a current mirror, is coupled to the output of optocoupler (18) in order to enable the fast transmission of the modulated signal without resorting to special high-speed components.