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US 6,144,167 AGranted
Circuit arrangement
AssigneeU.S. Philips Corporation
InventorsLambertus J. M. Bouwman, Arjan Van Den Berg
Life of this patent
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Abstract
A DC/DC converter of the flyback/forward converter type includes a switch (S), a transformer (T), a first diode (D1), a first capacitor (C1), a second diode (D2) and a second capacitor (C2). The first and the second capacitor are arranged in series between the output terminals (K3, K4) of the DC/DC converter. The DC/DC converter has a high efficiency and is very suitable for operating a lamp with a DC current.
Claims7
A DC/DC converter circuit for supplying a lamp comprising:
- a first input terminal and a second input terminal for connection to a power supply source supplying a DC voltage,
- a transformer having a primary winding and a secondary winding,
- a first branch interconnecting the input terminals and comprising a series arrangement of a switching element and the primary winding,
- a control circuit coupled to a control electrode of the switching element for generating a control signal so as to render the switching element high-frequency conducting and non-conducting,
- a second branch comprising a series arrangement of a first unidirectional element and a first capacitive element and connecting a first end of the secondary winding to a second end, and
- a first output terminal and a second output terminal for connecting a load circuit comprising the lamp,
- characterized in that the ends of the secondary winding are also connected by means of a third branch which comprises a series arrangement of a second unidirectional element and a second capacitive element, and in that a terminal between the first unidirectional element and the first capacitive element is connected to the first output terminal, and a terminal between the second unidirectional element and the second capacitive element is connected to the second output terminal.
4 more elements
Dependencies are inferred from the claim text.