CN2167507Y - Electronic ballast for gas discharge lamp with series resonant circuit - Google Patents

Abstract

The utility model relates to a gas discharge lamp electronic ballast. The utility model is except for comprising a plurality of basic circuits and is especially provided with a series resonant circuit and subsidiary series resonant circuits which correspond to the series resonant circuits. The series resonant circuits, an inductor L and a capacitor C are connected in series and are connected in the alternating current input terminal circuit of a commercial power V< lambda > and a rectification filtering circuit in series. The utility model is mainly characterized in that the LC series resonant circuit nears the commercial power frequency of the power supply V< lambda >. In this way, power supply currents of the circuit are quasi sine wave shaped, and the utility model is provide with superior performance, such as a super high power factor (lambada =1.00), lower harmonic interference performance (THD< 20%), high cost performance, etc.

Description

Electronic ballast for gas discharge lamp with series resonant circuit

The utility model belongs to the electric light source technology field, is a kind of electronic amperite of gas-discharge lamp that has series circuit.

More and more be extensive use of by people owing to the obvious energy-saving effect of electronic amperite of gas-discharge lamp, its performance also is modified gradually.(CN90215538.5) have the more excellent ratio of performance to price as " electronic ballast for fluoresent lamp that has current follow-up circuit ", can reach the requirement that indicates high-performance electronic ballast in IEC and the national sector standard about band H.But the source current of this ballast is a staircase waveform, does not also reach sinusoidal wave requirement, and the line power factor is generally also super only 0.95, source current more than 3 times harmonic wave also do not reach low aberrant type requirement.Therefore, this electric ballast can't use in demanding occasion.

The object of the present invention is to provide a kind of not only can reaching in IEC and the national sector standard about not with the low aberrant type requirement of H sign, but also can reach the electronic amperite of gas-discharge lamp of ultralow aberrant type.

The electric ballast of the present invention's design comprises overcurrent, overvoltage, overheated automatic protection circuit, basic circuits such as bridge rectifier, high frequency generation and control circuit.In order to solve the problem that original electric ballast exists, the present invention is provided with series circuit and corresponding with it auxiliary series circuit specially.

For the performance that improves electric ballast makes its ability with the extraneous adverse circumstances of stronger adaptation, the present invention can also be provided with power match and buffering compensating circuit, preheat starting circuit, abnormality automatic protection circuit etc.Fig. 1 has provided the circuit block diagram of this ballast, and Fig. 2 is a kind of electrical schematic diagram of this ballast, wherein Fc, Fv, F _TBe respectively overcurrent, overvoltage, overheated automatic protection circuit, constitute square frame 1.Diode D1～D4 and C0 constitute bridge rectifier filter circuit 4.High frequency takes place to adopt EB-I, EB-II, the EB-III type all can (see " electric light source ", 1990, N05, N06) with control circuit 5, BG among the figure ₁, BG ₂, L ₃, L ₄, L ₅, R ₁, R ₂, R ₃, R ₄, R ₅, R ₆, C ₆, C ₈, D ₆, and D ₇Connect to form through circuit.Power match is common circuit with buffering compensating circuit 6, and it is by capacitor C ₅, C ₇, C ₉, diode D ₅And inductance L ₆Form.7 is preheat starting circuit, and it is by starting capacitor C ₇, saltant thermistor PTC forms.8 is the abnormality automatic protection circuit.Be provided with series resonant circuit in this ballast especially, abbreviate series circuit 3 as.Can by inductance L be serially connected in civil power V after capacitor C is connected _λIn current rectifying and wave filtering circuit ac input end loop, its main feature is to make the LC series resonance at power supply V _λMains frequency f～near, i.e. f _～=1/2 π

At this moment, even filter capacitor C ₀Bigger, also can guarantee rectifier diode D ₁～D ₄The angle of flow near 2 π, thereby power supply input current I _λBecome continuous quasi-sine-wave, at this moment go into can be up to 1.00 for the line power factor, source current harmonic distortion total amount THD can be than 20% lower, and lamp current crest Coefficient m can reach the requirement less than 1.7 easily, becomes the very-high performance electric ballast.Other components and parts that series circuit also can have LC to have the humorous characteristic of string in addition constitute.Go into and reduce circuit conducted interference FCC in order to improve the line power factor, this ballast also is provided with auxiliary series circuit 2, and it is by capacitor C ₁With C ₂Constitute,, constitute π type filter circuit, both can prevent that the high-frequency signal of electric ballast from scurrying into electricity network, can prevent that again the external interference signal from scurrying into electric ballast by means of series circuit LC.9 is gas discharge lamp tube, and it can be low-pressure mercury yapour discharge lamp (as fluorescent lamp, uviol lamp, neon light), low-pressure sodium lamp, high-intensity gas discharge lamp (as high-pressure mercury lamp, high-pressure sodium lamp, metal halide lamp) etc.10 is half-bridge circuit, and it is by capacitor C ₃, C ₄Be connected after the series connection between DC power supply Ec and the ground, electrode of gaseous discharge lamp is connected on C ₃, C ₄On the joint that is connected.C ₃, C ₄In only connect one and can light a lamp too, but at this moment do not constitute half-bridge structure.

Embodiment:

Among Fig. 2, C ₁=C ₂=0.1 μ f/400V, C ₀=33 μ f/400V, C ₃=C ₄=0.1 μ f/400V, C ₅=1n/400V, C ₆=C ₈=1 μ f/16V, C ₇=10n/630V, C ₉Determine C=4.7 μ f/630V, L=2.155H, L by debugging ₃, L ₄, L ₅On R3K φ 10 magnet rings around 4T, 4T, 5T, L ₆Determine R by regulating power ₁=510K Ω, R ₂=910K Ω, R ₃=R ₄=18 Ω, R ₅=R ₆=9.1 Ω, D ₁～D ₇Be 1N4007, BG ₁=BG ₂=MJE13005, PTC are 300 Ω, are packaged in the shell after circuit connects, and constitute the electronic amperite of gas-discharge lamp that has series circuit.

Claims (4)

1, a kind of electronic amperite of gas-discharge lamp, comprise have overcurrent, the circuit of overvoltage, overheated automatic protection functions, current rectifying and wave filtering circuit, high frequency take place and basic circuit such as control circuit, it is characterized in that at civil power V _λBe connected in series near the series resonant circuit of resonance mains frequency in the current rectifying and wave filtering circuit ac input end loop, abbreviate series circuit as, between series circuit two ends and another root power input line and connect capacitor C ₁With C ₂, constitute auxiliary series circuit.

2, electric ballast according to claim 1, it is characterized in that series circuit by inductance L be serially connected in civil power V after capacitor C is connected _λIn current rectifying and wave filtering circuit ac input end loop, and make the LC series resonance at mains frequency f _～Near.

3,, it is characterized in that its series circuit can be made of other components and parts that have the humorous characteristic of string beyond the LC according to the described electric ballast that requires of claim 1 and 2.

4, according to claim 1,2 to require described electric ballast to it is characterized in that being suitable for frequency be 50Hz, 60Hz or other any power source frequency f _～Civil power, as long as choose suitable LC value, make its f _～=1/2 π

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