Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1990-10-19
1992-03-17
Mis, David
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315224, 315307, 315DIG7, H05B 4136, H05B 4138
Patent
active
050971824
ABSTRACT:
The improved power supply includes a source of DC power and a start-up section connected to such source. A power transistor section is connected to the start-up section and receives an initiating current signal from it. A transformer section has a primary winding connected to the power transistor within the power transistor section and provides output power to a lamp in response to a current flowing in the primary winding. A feedback section is coupled to the transformer section for providing a current mode feedback signal and a control section is coupled to the transformer section and derives a control signal from such transformer section. The control signal has a characteristic which is a function of the current in the primary winding and the power supply is thereby made self-timing. The control section is used to switch the power transistor to a non-conducting state, thereby terminating the flow of current through the primary winding of the transformer. The power transistor is brought to a non-conducting state prior to saturation of the transformer core. Optional features and other embodiments are also described.
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