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Power converter

A technology of power converters and transformers, applied in the direction of output power conversion devices, DC power input conversion to DC power output, instruments, etc., can solve the problems of increasing the overall complexity and cost of the transformer, and difficult to isolate the output circuit, etc., to achieve Flicker reduction and power quality improvement effects

Inactive Publication Date: 2011-04-13
POWER RES ELECTRONICS BV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this case, LEDs must be selected according to very strict classifications (screenings) for efficiency, color and / or forward voltage, or additional devices are required in each load circuit to control each output power individually, This adds to the overall complexity and cost of the transformer and makes it difficult to galvanically isolate the output circuit from potentially harmful grid voltages

Method used

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Embodiment Construction

[0019] figure 1 The figure shows an LED driver used as power supply for three LEDs 10 , 12 , 14 for red (R), green (G) and blue (B). Although only a single LED is shown for each color, each of these single LEDs could be replaced by a network comprising multiple LEDs of the same color connected in series and / or parallel.

[0020] The LED driver includes an AC / DC converter 16 and a DC / DC converter 18 . The AC / DC converter 16 has an input side connected to the terminals 20 , 22 of the 230V / 50Hz grid, for example via a manually operated switch 24 , and also includes an output connected to the DC input 26 of the DC / DC converter 18 side.

[0021] The DC input 26 of the DC / DC converter 18 is connected to a first primary 28 of an inductive element, in this case a transformer TR, and a second primary 30 of this transformer is grounded via a switch T1, wherein when switch T1 is closed The primary circuit of the transformer is closed. Switch T1 may be, for example, an N-channel MOSFE...

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Abstract

A power converter comprising a DC input (26) connected to an inductive element (TR), a switch (T1) arranged to interrupt the inductive current cyclically with a predetermined cycle period, a plurality of load circuits (31, 32, 33), and a multiplexer (36) having a plurality of parallel channels (M1, M2, M3) between first and second output terminals (34, 38) of the inductive element (TR), wherein each channel includes one of the load circuits (31, 32, 33). and the multiplexer is adapted to make the channels conductive sequentially and periodically, and the multiplexer has a switching period that is a multiple of the predetermined cycle period of the switch (T1).

Description

technical field [0001] The present invention relates to a power converter comprising a DC input terminal connected to an inductive element, a switch configured to cyclically interrupt an induced current having a predetermined cycle period, a plurality of load circuits, and a first and a multiplexer having a plurality of parallel channels between the second output terminal; wherein each channel includes one of said load circuits, and the multiplexer is adapted to induce the channels periodically in turn. [0002] More specifically, the present invention relates to a power converter useful as a driver for LEDs, especially high brightness LEDs for lighting purposes. Background technique [0003] LED lighting fixtures (for example, ones that can be connected to the grid by screwing into a socket like a conventional light bulb) can be equipped with white LEDs, or colored LEDs such as the traditional primary colors: red, green and blue (RGB). combination. The combination of colo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M3/158H05B33/08H05B44/00
CPCH02M3/33561H05B33/0827H02M3/1588Y02B70/1466H05B45/46Y02B70/10
Inventor 简·万纳缅诺·卡多卢斯J·H·席杰夫林
Owner POWER RES ELECTRONICS BV