Lighting device with adjustable brightness

A lighting device and brightness technology, applied in the direction of lighting devices, lighting device components, lighting and heating equipment, etc., can solve the problems of high loss, low power density, switching loss, etc., achieve low loss, improve working life and reliability performance and high power density

Inactive Publication Date: 2015-10-21
武汉绿鼎天舒科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the lighting device using the switching power supply used in the above-mentioned lighting device has switching loss, a surge voltage that will be generated when the switching element is turned off, and poor working stability of the lighting device caused by voltage instability, high loss, and low power density. The problem of low working life and reliability; and the traditional lighting device that only serves as a lighting tool, which cannot adjust the brightness, and cannot meet the needs of users to use different light brightness at different times

Method used

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  • Lighting device with adjustable brightness
  • Lighting device with adjustable brightness
  • Lighting device with adjustable brightness

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specific Embodiment approach

[0031] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] Such as figure 1 As shown, the switching power supply of the brightness-adjustable lighting device of the present invention includes a resonant converter with a center-tapped transformer, including an input voltage U in , Transformer T with middle tap on primary side and secondary side, switching elements S1, S2, S3, S4, diodes D1, D2, D3, D4, inductor L; the above switching elements are IGBTs, and the diodes are fast recovery diodes.

[0033] combined with figure 1 The structure of the power switch in the brightness-adjustable lighting device of the present invention is described in detail, and the specific connection relationship is: the input voltage U in The positive terminal is connected to the collectors of switching elements S1 and S3, and the input voltage U in The negative terminals of ...

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Abstract

The invention provides a lighting device with adjustable brightness. The lighting device comprises a lamp holder, a switch power supply, a lamp rod, a lamp cover and a lamp base, wherein the lamp cover and the lamp base are installed on the top end of the lamp rod. The switch power supply comprises a resonance converter with a middle tapped transformer. The lighting device is low in loss and high in power density. Service lifetime for working of the lighting device can be extended and reliability thereof can be improved. Requirements on brightness of the lighting device in different environments imposed by a user can be met.

Description

technical field [0001] The invention belongs to the field of lighting tools, in particular to a lighting device with adjustable brightness. Background technique [0002] Lighting devices have long become a necessity for people's life and study, especially for students and working families who need to study at home. [0003] At present, while satisfying the functions of lighting tools, traditional lighting devices often use switching power supplies to switch on and off. The working process of switching power supplies used in traditional lighting devices is through "chopping", that is, chopping the input DC voltage into amplitudes. This is achieved by a pulse voltage equal to the amplitude of the input voltage. The duty cycle of the pulse is adjusted by the controller of the switching power supply; once the input voltage is chopped into an AC square wave, its amplitude can be increased or decreased by the transformer, and the output can be increased by increasing the number o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02F21V3/02F21V19/02
Inventor 杨慧萌
Owner 武汉绿鼎天舒科技发展有限公司
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