CN2473853Y

CN2473853Y - Multi-way output daylight lamp electronic ballast

Info

Publication number: CN2473853Y
Application number: CN 01207765
Authority: CN
Inventors: 龙德瑛
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-03-23
Filing date: 2001-03-23
Publication date: 2002-01-23
Anticipated expiration: 2011-03-23

Abstract

The utility model discloses a fluorescent lamp electronic ballast which can provide multiple outputs simultaneously. The circuit board includes a rectifier circuit, a multivibrator circuit, a driver transformer, a push-pull driving circuit and a LC resonant circuit. The primary coil of the driver transformer is connected with the output end of the multivibrator circuit; each primary coil is connected with each power transistor of the push-pull driving circuit and each power transistor can drive plurals of fluorescent tubes lighting simultaneously, which achieves driving plurals of fluorescent tubes with one oscillation output circuit. The utility model has a high efficiency and a low electrical dissipation and compared with prior art, the utility model can save the electricity over 30%.

Description

Multichannel output electronic ballast for fluorescent lamp

The utility model relates to fluorescent lamp ballast, specifically a kind of electronic ballast for fluorescent lamp that multichannel output can be provided simultaneously.

Existing electronic ballast for fluorescent lamp generally is to be welded with the electronic devices and components of being made up of current rectifying and wave filtering circuit, the vibration LC resonant circuit that output circuit and output thereof were connected in series in the circuit board, said structure can only fluorescent tube of an electric ballast adapted, so its inefficiency, electrical loss is also bigger, and when comprising a plurality of fluorescent tube in the lamp box, installation is with cumbersome, and circuit is also complicated.

The purpose of this utility model is to overcome the shortcoming of above-mentioned electronic ballast for fluorescent lamp, provides the enough vibration output circuits of a kind of energy that the electronic ballast for fluorescent lamp of multichannel output is provided simultaneously.

The purpose of this utility model is achieved in that a kind of multichannel output electronic ballast for fluorescent lamp, comprise the wiring board of establishing in shell and the shell, on its wiring board, comprise bridge rectifier, multi-resonant oscillating circuit, driving transformer, push-pull driver circuit and LC resonant circuit, the output of bridge rectifier is through voltage stabilizing, after the filtering, be connected with the multi-resonant oscillating circuit input, the frequency of multi-resonant oscillating circuit is more than 20KHz, the output of multi-resonant oscillating circuit connects the primary coil of driving transformer, several secondary coils of driving transformer are connected with corresponding push-pull driver circuit respectively, the withstand voltage of push-pull driver circuit is more than 200V, and the output of push-pull driver circuit is connected with several LC resonant circuits.

Driving transformer and push-pull driver circuit are feasible only can to drive many fluorescent tubes with a vibration output circuit to the utility model by increasing, and the performance that can drive by the model change of power tube in the conversion push-pull driver circuit, for example use power tube BU508A, its electric current can reach more than the 5A, withstand voltage 200V, it is simultaneously luminous to drive 10 fluorescent tubes at most; If use power tube BU508D, it is withstand voltage to reach 1500V, and work will be more reliable; Also can use the power tube of withstand voltage 400V or 500V in addition, for example BU408 (7A, 400V), MJ10016 (50A, 500V), MJE13003 (1.5A, 400V), MJE13007 (8A, 400V) etc.This electric ballast adopts high-frequency impulse to start the mode of lighting a lamp, and can drive a plurality of fluorescent tube work simultaneously, the efficient height, and electrical loss is low, and more original technical electricity saving is more than 30%, can both normally start in the environment of temperature-30 ℃～+ 40 ℃.

The utility model has an accompanying drawing:

Fig. 1 is the circuit diagram of the utility model electronic ballast for fluorescent lamp.

Below in conjunction with accompanying drawing and most preferred embodiment the utility model is described in further detail.

Figure 1 shows that the circuit of this multichannel output electronic ballast for fluorescent lamp.The input of circuit connects the AC power of 220V, and diode bridge rectifier QZ is connected with AC power by a fuse F, and the output of rectifier connects the resistance R of 20K Ω ₁With 12V voltage stabilizing didoe D ₁, integrated circuit (IC) ₁555 direct-current working volts are by resistance R ₁Step-down, voltage stabilizing didoe D ₁Pressure limiting is supplied with, and this direct voltage is added in IC ₁On the connected node of 4,8 two ports of 555, this node connects capacitor C simultaneously ₁(100nF, positive terminal 50V), C ₁Negative pole end ground connection, C ₁With R ₁Input terminal voltage to this ballast circuit strobes; IC ₁555 port one ground connection has capacitor C between port 2 and 6 connected node and the ground wire ₂(1000nF, 400V); Be connected with 27K Ω resistance R between the connected node of the connected node port 2,6 of port 3,7 ₂IC ₁555 port 7 connects capacitor C ₃(10 μ F, negative pole end 50V).Driving transformer is made up of primary coil and two secondary coils, all be to be that ferrite bead or the magnetic cup (magnetic jar) of 10mm is entwined by diameter, primary coil twines 40 circles with enamelled wire or the cotton covered wire of diameter 0.2mm, secondary coil with the cotton covered wire of diameter 0.2mm around two groups of totally 2 * 8 circles, will note the relevant position end to end of secondary coil during connection, markd among Fig. 1 is in-phase end.The primary coil of driving transformer and capacitor C ₃Positive terminal link to each other, secondary coil links to each other with the power tube BU508A of push-pull driver circuit, BU508A is by the resistance R of 10K Ω ₃, 1K Ω resistance R ₄Form R with triode Q ₃The base stage that connects Q, R ₄The emitter that connects Q, the collector electrode of Q connects the capacitor C of LC oscillating circuit ₄(0.47NF, 600V).Each power tube BU508A can drive several fluorescent tubes G, and in the present embodiment, as shown in Figure 1, the BU508A of top drives two fluorescent tube G, and the BU508A of below drives a fluorescent tube G.Each LC oscillating circuit all is by a capacitor C ₄(0.47NF 600V) starts inductance coil L composition with one, starts inductance coil L and connects C with fluorescent tube G ₄In parallel with L and G, C ₄With diode D ₂In parallel.Inductance coil L is entwined with ferrite E5 magnetic core, with the enamelled wire of diameter 0.2mm around 200 circles, the turn-to-turn gap is 0.2～0.5mm, is best clearance by adjusting test with the easiest gap that starts light during fluorescent lamp, also will guarantee self not excessive heating simultaneously.

When work, IC ₁The approximate square wave of 555 vibrations that produce drives two power tube BU508A conducting in turn after the driving transformer conversion, high frequency voltage is provided, fluorescent tube G not conducting luminous before, inductance coil L and capacitor C in the LC oscillating circuit ₄Form resonance generation high pressure and start fluorescent tube, just excite mercury ionization generation ultraviolet light in the fluorescent tube, fluorescent tube will luminous conducting.Detect by the test to present embodiment, prove that it can economize on electricity about 40% than prior art, the lumen degree is 87～91%, and line power is 123% nominal value under rated voltage, and power factor is 0.302%, and line current is 0.374mA.

Claims

1. a multichannel is exported electronic ballast for fluorescent lamp, comprise the wiring board of establishing in shell and the shell, on its wiring board, comprise bridge rectifier, multi-resonant oscillating circuit, LC resonant circuit, the output of bridge rectifier is after voltage stabilizing, filtering, be connected with the multi-resonant oscillating circuit input, the output of multi-resonant oscillating circuit is connected with the LC resonant circuit, it is characterized in that: be connected driving transformer and push-pull driver circuit between multi-resonant oscillating circuit and LC resonant circuit, the output of push-pull driver circuit is connected with several LC resonant circuits.

2. electric ballast as claimed in claim 1 is characterized in that the primary coil of driving transformer is connected with the multi-resonant oscillating circuit output, and several secondary coils are connected with corresponding power tube in the push-pull driver circuit respectively.

3. electric ballast as claimed in claim 1 or 2, the frequency that it is characterized in that multi-resonant oscillating circuit is more than 20KHz.

4. electric ballast as claimed in claim 3, the withstand voltage that it is characterized in that power tube in the push-pull driver circuit is more than 200V.

5. electric ballast as claimed in claim 4 is characterized in that the power tube in the push-pull driver circuit can adopt models such as BU508A, BU508D, BU408, MJ10016, MJE13003 and MJE13007.