Circuit for converting AC voltage into DC voltage
AssigneeKoninklijke Philips Electronics N.V.
InventorsThomas Duerbaum, Georg Sauerlaender
Life of this patent
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Abstract
The invention relates to a circuit for converting AC voltage into DC voltage for a consumer (RL), in which the AC voltage supplied is passed through a large induction coil (L50) and a rectifier (G). On the output side the rectifier (G) has two capacitors (C1, C2) connected in parallel, which are separated by a diode (D). In addition, the capacitor C1 positioned closer to the rectifier (G) is discharged at least in part via an active converter (20) in the second half of each power supply wave, as a result of which the current consumption is widened and the system harmonics are reduced. Furthermore, the induction coil (L50) can be dimensioned correspondingly smaller, but can nevertheless meet the relevant standards.
Claims5
A circuit for converting AC voltage into DC voltage for at least one consumer, the circuit comprising:
- an AC voltage supply (W),
- a rectifier module (G) whose two inputs are connected to the AC voltage supply and to whose two outputs (+, −) are connected two output lines with external terminals (AA) for coupling at least one consumer (RL),
- a main capacitor (C2) which is connected in parallel to a consumer to be connected between the two external terminals (AA) of the rectifier module (G), at least one induction coil (L50) which is arranged between the AC voltage supply (W) and the rectifier module (G),
- characterized in that the circuit also comprises:
- a further capacitor (C1) which is connected in parallel to the main capacitor (C2) between the two outputs (+, −) of the rectifier module (G),
- a diode (D) which is connected in one of the output lines of the rectifier module (G) and separates the main capacitor (C2) from the further capacitor (C1),
- an active converter (20) whose input is connected between the diode (D) and one of the outputs (+) of the rectifier module (G) and arranged so that it discharges the further capacitor (C1) at least in part in the second half of each half-wave supplied by the AC voltage supply (W).
Dependencies are inferred from the claim text.