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Dimming power supply and Bleeder protection circuit thereof

A technology of dimming power supply and protection circuit, which is applied in the direction of electric lamp circuit layout, light source, electric light source, etc., can solve problems such as explosion or fire, thick smoke, etc., to achieve the effect of enhancing reliability, avoiding thick smoke, and easy to quantify production.

Pending Publication Date: 2015-01-21
CIVILIGHT SHENZHEN SEMICON LIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the purpose of the present invention is firstly to provide a dimming power supply, aiming to solve the technical problem that when the Bleeder circuit in the existing power supply is abnormal, it is easy to cause thick smoke, or even cause an explosion or fire.

Method used

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  • Dimming power supply and Bleeder protection circuit thereof
  • Dimming power supply and Bleeder protection circuit thereof
  • Dimming power supply and Bleeder protection circuit thereof

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Embodiment Construction

[0015] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0016] figure 2 It is a schematic structural diagram of the dimming power supply provided by the embodiment of the present invention; for the convenience of description, only the parts related to this embodiment are shown, as shown in the figure:

[0017] A dimming power supply, comprising a fuse F1 sequentially connected to an AC live wire L, a filter unit 300, a rectifier bridge 400, a chopper boost circuit 200, a driver chip 500, and a circuit connected between the chopper boost circuit 200 and the driver chip 500 Bleeder protection circuit 100 between.

[0018] The Bleeder protection circuit...

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Abstract

The invention belongs to the field of dimming illumination and particularly relates to a dimming power supply and a Bleeder protection circuit thereof. According to the Bleeder protection circuit, a first switch and a second switch are respectively connected to two ends of a Bleeder resistor in parallel, and when a switch tube Q1 in the Bleeder protection circuit is short-circuited, the two switches can jointly achieve severe circuit-to-ground short circuit to enable a protective tube F1 to be instantaneously fused, accordingly the whole circuit is protected, and dense smoke, explosion, fire disaster and other accidents are avoided. In addition, the Bleeder protection circuit does not cause circuit loss, the dimming matching and dimming depth of the circuit are not influenced, the EMI and EMC of the whole circuit are not influenced, the reliability of the circuit is improved, and the circuit is sound, can be quantitatively produced and has high cost performance.

Description

technical field [0001] The invention belongs to the field of dimming lighting, in particular to a dimming power supply and a Bleeder protection circuit thereof. Background technique [0002] At present, there are various dimming lighting products on the market. In the process of production and development, the dimming schemes that adapt to leading edge phase cutting and trailing edge phase cutting are mainly based on Iwatt, CIRRUSLOGIC, MPS, etc., and the driving circuit in the dimming power supply scheme is generally as follows: figure 1 As shown, the Bleeder circuit 100 is composed of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a switch tube Q1 and other components. Under normal working conditions, the circuit can basically meet the dimming requirements of lighting fixtures, but when an abnormality occurs in the Bleeder circuit 100, for example, when the switch tube Q1 is short-circuited and fails, the resistor R1 and the resistor R2 are short-circuited by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 汪发根
Owner CIVILIGHT SHENZHEN SEMICON LIGHTING
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