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Light driving circuit for effective control part temperature in fluorescent lamp

A technology for driving circuits and circuits, applied in the direction of light sources, electric light sources, electrical components, etc.

Inactive Publication Date: 2009-03-11
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Disadvantages of this forward feeding device such as figure 1 As shown, the operating frequency of the circuit in the figure is higher than the ignition frequency required for the lamp to ignite

Method used

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  • Light driving circuit for effective control part temperature in fluorescent lamp
  • Light driving circuit for effective control part temperature in fluorescent lamp
  • Light driving circuit for effective control part temperature in fluorescent lamp

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0015] image 3 A lamp driving circuit 10 used in a fluorescent lamp according to an embodiment of the present invention is shown. Circuit 10 includes a lamp driving circuit 12 , an RC oscillator circuit 16 , a forward feed circuit (part 22 ) and a control circuit 26 . Circuit 12 is powered directly by a DC bus voltage rectified from the AC mains voltage. The circuit 12 generates a high-frequency square wave voltage signal at a certain frequency based on the oscillation frequency of the RC circuit 16 to ignite and drive the lamp. The RC circuit 16 includes a resistor Rosc (for example, 110KΩ) and a capacitor Cosc (for example, 180pf ). The UBA2024 chip is a CFL-I integrated circuit that can be used as circuit 12 and is commercially available from Philips Semiconductors in the Netherlands. Other similar chips can also be used.

[0016] Upon detecting a rise in the mains voltage reflected by a rise in the DC bus voltage, the forward feed circuit 22 increases the output frequ...

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PUM

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Abstract

The present invention provides an improved lamp driving circuit. The circuit includes a circuit designed to generate an output signal at a predetermined frequency in response to a mains voltage supplying the lamp, a forward feed circuit designed to increase the frequency of the output signal in response to a rise in the supply voltage, and a A defeat circuit designed to disable the forward feed circuit during ignition of the lamp. In a preferred embodiment of the invention, the fail circuit comprises a positive temperature coefficient (PTC) resistor connected in parallel with the resistor of the forward feed means to form a parallel circuit. At room temperature, the parallel circuit has a relatively low resistance value such that the voltage across the parallel circuit cannot trigger the forward feed to increase the frequency of the output signal. In this way, the lamp can be switched on normally during ignition, while at the same time the temperature of the lamp components can be maintained at a stable level.

Description

technical field [0001] The present invention relates generally to electronic circuits, and more particularly to fluorescent lamp driver circuits for efficiently controlling the temperature of components within the lamp. Background technique [0002] Fluorescent lamps, such as compact integrated fluorescent lamps (CFL-I), tube lamps (TL), etc., are usually designed to operate at a certain mains voltage. Depending on different locations in different regions, the mains voltage can vary significantly. For example, in the high voltage area, the normal mains voltage is 220V-235V, but in the worst case the mains voltage may sometimes be as high as 250V, which will result in higher temperatures on the components of the lamp. As a result, the life of these components, and thus the life of the lamp itself, becomes significantly shorter than that of a lamp operating on normal mains power. [0003] People have proposed a forward feeding device to solve the above problems. When this d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/298
Inventor 程明艾蒂安·埃伯松
Owner KONINK PHILIPS ELECTRONICS NV