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Electric ballast and control method for limiting firing current

An electronic ballast and ballast technology, applied in the direction of electric light sources, electrical components, lighting devices, etc., can solve the problem of easy burnout of electronic ballasts, and achieve the effect of protection from being burned

Inactive Publication Date: 2013-03-27
SHANGHAI BEILING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the current electronic ballast chip ICs do not limit the current of the power tube. If the fluorescent tube is abnormal, the power tube of the half-bridge driver of the electronic ballast will bear a large current. device is easily burned

Method used

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  • Electric ballast and control method for limiting firing current
  • Electric ballast and control method for limiting firing current
  • Electric ballast and control method for limiting firing current

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0028] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] like Figure 7 As shown, the electronic ballast of the preferred embodiment of the present invention is in figure 1 A sampling resistor Rs is connected in series between the second power transistor T2 of the half-bridge driver and the ground, if the power transistor of the half-bridge driver adopts a bipolar transistor, the emitter of the second power transistor T2 is connected to the sampling resistor Rs, If the power transistor of the half-bridge driver adopts MODFET, the source of the second power transistor T2 is connected to the sampling resistor Rs. Set the detection comparison voltage V in the electronic ballast chip IC max and the maximum allowable current i max , the detection terminal DET of the electronic ballast chip IC is connected to the node between the second power transistor T2 and the sampling resistor Rs. In ...

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PUM

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Abstract

The invention provides an electronic ballast for current limiting to initial firing current, which comprises a chip IC of a ballast, a half-bridge driver consisting of a power tube, and a resonance circuit, wherein, a sampling resistor between a second power tube T2 of the half-bridge driver and the ground, and a detecting element of the chip IC of the ballast is connected to a node between the second power tube T2 and the sampling resistor. The invention further provides a method for controlling current limiting to the initial firing current of the electronic ballast, the current limiting to the initial firing current is performed so as to avoid bearing great current by the power tube of the half-bridge driver of the electronic ballast and protect the electronic ballast from being burnt.

Description

technical field [0001] The invention relates to the field of electronic ballasts for fluorescent lamps, in particular to an electronic ballast capable of limiting ignition current and a control method for limiting ignition current. Background technique [0002] figure 1 It is the basic circuit diagram of the series resonant electronic ballast using the electronic ballast chip IC as the controller. In the figure, T1 and T2 are power transistors, which can be bipolar transistors or MOSFETs, and the power transistors form a half-bridge driver. C1 is a DC blocking capacitor, L is a resonant (current limiting) inductor, C is a resonant capacitor, and LAMP is a fluorescent tube. [0003] Generally speaking, this circuit has three states: preheating state, ignition state and working (lit) state. Its equivalent circuit diagram is figure 2 (preheated state) and image 3 (working status). [0004] from figure 2 It can be concluded that when the lamp is not turned on, the DC v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B41/298H05B41/36
Inventor 王小明
Owner SHANGHAI BEILING