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Low cost power supply circuit and method

A power circuit, current technology, applied in the direction of electric light source, circuit device, emergency power supply arrangement, etc.

Inactive Publication Date: 2012-05-23
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, however, the required frequency sweep will be large in order to cover all input and output voltage variations

Method used

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  • Low cost power supply circuit and method
  • Low cost power supply circuit and method
  • Low cost power supply circuit and method

Examples

Experimental program
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Embodiment Construction

[0018] figure 1 A schematic diagram depicts an embodiment of a power supply circuit 100 connected to a load 102 through an output terminal 104 . The power supply circuit 100 includes a first converter stage 110 for converting an AC mains input voltage supplied at an input terminal 106 to a DC output voltage (eg 430V) at a terminal 112 . In various embodiments, the first converter stage 110 may be a boost converter, as known per se to the skilled person, and includes a rectifier circuit and a power factor correction PFC circuit. If instead of or in addition to the AC mains voltage a DC (mains or bus) voltage would be available, the first converter stage 110 may be omitted.

[0019] The DC output voltage (or DC rail or bus voltage) of the first converter stage is supplied to a DC input voltage terminal 114 of a second converter stage, also called LLC converter stage 116 . LLC converter stage 116 outputs a DC voltage at output terminal 118 . exist figure 2 A circuit diagram ...

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PUM

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Abstract

A power supply circuit has an LLC converter stage for converting a DC voltage input into a DC voltage output, and at least one hysteretic converter stage. Each hysteretic converter stage has a DC voltage input coupled to the DC voltage output of the LLC converter stage, and a DC current output. The LLC converter stage lacks a feedback control, and is operated at its load independent point. A ripple on the DC voltage output of the LLC converter does not affect the output current of the hysteretic converter stage. The stable DC current output of the hysteretic converter stage is coupled to a load having one or more LED strings.

Description

technical field [0001] The present invention relates to the field of power supply circuits and methods, and more particularly to supplying power to a load comprising a plurality of light emitting diodes LEDs in lighting applications. Background technique [0002] In the field of power supplies the use of LLC converters is known. The LLC converter includes a series arrangement of a first parallel arrangement of first switches and first diodes and a second parallel arrangement of second switches and second diodes. The series arrangement is coupled between the first input terminal and the second input terminal for receiving a DC input voltage. The voltage on the first terminal is positive relative to the voltage on the second terminal. The cathode of the first diode and the cathode of the second diode point towards the first terminal. The first diode may be extrinsic to the first switch, or may be intrinsic to it. Likewise, the second diode may be extrinsic to the second sw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH05B33/00H02M2001/007Y02B70/126H05B33/0815H02M3/335H02M1/4225Y02B70/10H05B45/3725H05B45/375H05B45/38H02M1/007H02J9/062H02M3/33561H02M3/33584Y02B20/30
Inventor G·W·范德维恩J·斯内尔坦
Owner SIGNIFY HLDG BV
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