GENERATING DRIVE SIGNALS FOR A SYNCHRONOUS RECTIFICATION SWITCH OF A FLYBACK CONVERTER
First Claim
1. A circuit arrangement (100) comprising at least one flyback converter, in particular at least one actively clamped bidirectional flyback converter, witha first power semiconductor (Q1),a second power semiconductor (Q2),a third power semiconductor (Q3),a fourth power semiconductor (Q4),wherein the first power semiconductor (Q1) and the third power semiconductor (Q3) are arranged on the primary side of a transformer unit (Tr1), and the second power semiconductor (Q2) and the fourth power semiconductor (Q4) are arranged on the secondary side of the transformer unit (Tr1),characterized in that the second power semiconductor (Q2) acts as synchronous rectification switch, andthe drive signal for said synchronous rectification switch is generated as a function of an oscillating signal controlling the synchronous rectification switch.
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Abstract
In order to further develop a circuit arrangement (100) as well as a method for generating at least one drive signal for at least one synchronous rectification switch of at least one flyback converter in such way that an improved and simpler thermal management can be combined with a significant cost reduction as well as with a higher efficiency, it is proposed to generate the drive signal for said synchronous rectification switch as a function of at least one oscillating signal controlling the synchronous rectification switch, of at least one constant delay time, of at least one variable delay time, and of at least one Boolean OR function.
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Citations
9 Claims
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1. A circuit arrangement (100) comprising at least one flyback converter, in particular at least one actively clamped bidirectional flyback converter, with
a first power semiconductor (Q1), a second power semiconductor (Q2), a third power semiconductor (Q3), a fourth power semiconductor (Q4), wherein the first power semiconductor (Q1) and the third power semiconductor (Q3) are arranged on the primary side of a transformer unit (Tr1), and the second power semiconductor (Q2) and the fourth power semiconductor (Q4) are arranged on the secondary side of the transformer unit (Tr1), characterized in that the second power semiconductor (Q2) acts as synchronous rectification switch, and the drive signal for said synchronous rectification switch is generated as a function of an oscillating signal controlling the synchronous rectification switch.
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8. A method for generating at least one drive signal for at least one synchronous rectification switch of at least one flyback converter, in particular at least one actively clamped bidirectional flyback converter,
characterized in that the drive signal for said synchronous rectification switch is generated as a function of at least one oscillating signal controlling the synchronous rectification switch.
Specification