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LED (Light-Emitting Diode) power supply circuit compatible with conventional fluorescent lamp ballast

A technology of LED power supply and fluorescent lamp, which is applied in the direction of electric lamp circuit layout, light source, electric light source, etc., can solve the problems of high cost, low conversion efficiency, and low overall conversion efficiency, and achieve high conversion efficiency and simple and reliable circuits.

Inactive Publication Date: 2014-12-10
王兴利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The same product cannot be compatible with electronic ballasts and inductive ballasts at the same time;
[0005] 2. The conversion efficiency is not high, the overall conversion efficiency is lower than 80%, and the work is not stable enough;
[0006] 3. The line structure is complex and the cost is high;
[0008] 5. When the installation is replaced with electricity, it will bring the danger of electric shock to the operator

Method used

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  • LED (Light-Emitting Diode) power supply circuit compatible with conventional fluorescent lamp ballast
  • LED (Light-Emitting Diode) power supply circuit compatible with conventional fluorescent lamp ballast
  • LED (Light-Emitting Diode) power supply circuit compatible with conventional fluorescent lamp ballast

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: Compatible with typical high-frequency AC electronic ballasts for traditional fluorescent lamps.

[0044] Such as figure 2 As shown, the simplified diagram of the circuit model of a classic traditional self-excited half-bridge resonant fast-start ballast and a traditional CFL fluorescent lamp, so that the equivalent resistance of the CFL fluorescent tube after starting is R (≈500?), It is connected in parallel with C5 in the electronic ballast, and then connected in series with L2 in the electronic ballast. The parallel impedance of R and C5 is: ZRC5= = , inductive impedance ZL =jωL. The total impedance of CFL fluorescent lamp and electronic ballast is Z1=ZRC+ ZL= + jωL. (For the convenience of analysis, the internal resistance of the circuit and the equivalent DC impedance of the inductor are ignored here) The total power of the LRC circuit of the CFL fluorescent lamp and the electronic ballast P1 = = = .

[0045] Such as im...

Embodiment 2

[0054] Embodiment 2: Compatible with typical traditional inductive ballasts (with starter).

[0055] Such as Figure 4 As shown, when using the LED lamp tube of the present invention to work together with a typical traditional inductive ballast, the circuit diagram is as above, and there is no need to disassemble the lamp to change the circuit, but it is necessary to replace the original starter S with a fixedly connected short-circuiter , to connect the line. The short connector can be made into the same shape and size as the original starter, and can be replaced directly and quickly, or the function of the short connector and the fuse can be combined into one to play the role of overcurrent protection.

[0056] Another outstanding advantage is that after the LED lamp tube of the present invention is inserted at any end of the lamp tube first, due to the small capacitance of C3, the impedance to 50 / 60HZ power frequency ( ) is very large, which acts as a barrier, and the PI...

Embodiment 3

[0060] Embodiment 3: Compatible with isolated instant-start electronic ballasts.

[0061] Such as Figure 5 As shown, the LED lamp tube of the present invention cooperates with the isolated instant start electronic ballast. The high-frequency voltage is coupled to C1 through the isolation transformer T2, and applied to the Ta terminal and the Tb terminal. The current input from the Ta terminal is rectified by D1, D2, D3, D4 and converted to DC, then smoothed and filtered by C2, then flows through the LED array, rectified by D5 and D6, and then restored to AC, then reaches the Tb terminal through C3 to form a loop. In this mode, C3 plays three key roles: one is to act as a high-frequency current channel, and the other is to select the size of C3 to change the line impedance ( ) so that the lamp output meets the required current. Third, after inserting any end of the lamp first, because of the small capacitance of C3, the impedance of 50 / 60HZ power frequency ( ) is very lar...

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PUM

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Abstract

The invention discloses an LED (Light-Emitting Diode) power supply circuit compatible with the conventional fluorescent lamp ballast. The LED power supply circuit comprises input terminals Ta1, Ta2, Tb1 and Tb2, capacitors C1, C2 and C3, diodes D1, D2, D3, D4, D5 and D6, and an LED array, wherein the capacitor C1 is connected in parallel between the terminals Ta1 and Ta2; the cathode of the diode D1 is connected with the anode of the diode D2, and is connected with the input terminal Ta1; the anode of the diode D1 is connected with the anode of the diode D3 and the anode of the diode D6; the cathode of the diode D2 is connected with the cathode of the diode D4 and the cathode of the diode D5 respectively; the anode of the diode D5 is connected with the cathode of the diode D6, and is connected with one end of the capacitor C3; the other end of the capacitor C3 is connected with the input terminals Tb1 and Tb2 respectively. Through adoption of the LED power supply circuit compatible with the conventional fluorescent lamp ballast, butt joint and compatibility of an LED array with a ballast used in the conventional CFL (Compact Fluorescent Lamp) are realized, and a complex repeated wiring modification process is avoided.

Description

technical field [0001] The invention relates to an LED fluorescent lamp, in particular to an LED power supply circuit compatible with a traditional fluorescent lamp ballast. Background technique [0002] The LED fluorescent tubes sold in the market have the advantages of environmental protection, energy saving and power saving, but users need to change the internal circuit of the original traditional fluorescent lamps before they can be used (shown figure 1 , figure 2 ). Especially in the case of using an electronic ballast, if the electronic ballast is not removed and then connected to the power supply, it may not light up normally, and the electronic ballast and the LED fluorescent tube may burn out if it is serious. It is inconvenient for users to replace and use, and it needs qualified electrician technicians to operate. [0003] Although a small number of manufacturers have products that claim to be compatible, most of them do not work well in actual use. Mainly...

Claims

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Application Information

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IPC IPC(8): H05B37/02
CPCY02B20/00
Inventor 王兴利
Owner 王兴利