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Supply voltage management

A technology of power supply voltage and switching power supply, which is applied in the direction of electric light source, electroluminescent light source, high-efficiency power electronic conversion, etc., and can solve the problems of increased starting resistor cost, high starting current, long starting time, etc.

Active Publication Date: 2015-07-29
DIALOG SEMICONDUCTOR GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use of high capacitance can result in longer start-up time, or can result in higher start-up current
This may reduce the efficiency of the system and may result in an increase in the expense of the starting resistor

Method used

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Embodiment Construction

[0041] In the present invention, a light bulb "assembly", includes all the elements needed to replace a conventional incandescent filament-based light bulb, especially a light bulb connected to a standard electricity supply. In British English (and in the present invention) the power supply is referred to as mains, while in American English the power supply is usually referred to as a power cord. Other terms include AC power, line power, home power, and grid power. It should be understood that these terms can be easily substituted, and have the same meaning as these terms.

[0042] Typically, the mains voltage is 230-240V AC at 50Hz (mains frequency) in Europe and 110-120V AC at 60Hz (mains frequency) in North America. The principles set forth by the present invention apply to any suitable power supply, including the mentioned mains / power lines, DC power and rectified AC power.

[0043] figure 1 a is a schematic diagram of a light bulb assembly, and the assembly 1 includes ...

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PUM

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Abstract

The present document relates to a driver circuit for a solid state light source. In particular, the present document relates to the start-up and / or the maintenance of a supply voltage for the integrated circuit of a driver circuit. A driver circuit (300) for a solid state light source (309) is described. The driver circuit (300) comprises a switched-mode power converter comprising a power converter switch (202) and a transformer (307). The switched-mode power converter is configured to convert an input voltage (230) at an input of the switched-mode power converter into an output voltage (231) at an output of the switched-mode power converter (200). Furthermore, the driver circuit (300) comprises a controller (306) configured to generate a gate control signal (232) for putting the power converter switch (202) into an on-state and / or an off-state. In addition, the driver circuit (300) comprises a supply voltage capacitor (310) coupled to the controller (306) and configured to provide a supply voltage to the controller (306). A primary coil (314) of the transformer (307) is arranged in series with the power converter switch (202), a secondary coil arrangement (313, 315) of the transformer (307) is configured to provide the output voltage (231), the secondary coil arrangement (313, 315) is coupled to the supply voltage capacitor (310) via a supply voltage transistor (350), and the supply voltage transistor (350) is controlled such that the supply voltage provided by the supply voltage capacitor (310) lies within a pre-determined voltage interval.

Description

technical field [0001] The invention relates to a drive circuit for a solid state light source. In particular, the invention relates to starting and / or maintaining a supply voltage for an integrated circuit driving a circuit. Background technique [0002] After the mains power of the light bulb assembly is turned on, starting the driving circuit of the light bulb assembly, especially the control chip for starting the driving circuit usually requires additional components for the driving circuit. Additional components add to the overall power loss and additional bill-of-materials cost of the drive circuit. Especially when used with a phase-cut dimmer, the power supply of the controller chip usually requires a relatively high capacitance value of the supply voltage capacitor to maintain a smooth and stable supply voltage Vcc at all times. Using high capacitance can result in longer start-up times, or can result in higher start-up currents being used. This may reduce the eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCY02B20/346H05B33/0815Y02B20/30H05B45/3725H05B45/10Y02B70/10H05B41/24F02P3/0884H02M1/0048H02M1/08H02M3/33507
Inventor 霍斯特·克内德根
Owner DIALOG SEMICONDUCTOR GMBH