CN2792089Y

CN2792089Y - Fluorescent lamp ballast

Info

Publication number: CN2792089Y
Application number: CN 200520071405
Authority: CN
Inventors: 范月军; 陈德柱
Original assignee: DASHENG ELECTRI-POWER ENERGY-SAVING EQUIPMENT Co Ltd
Current assignee: DASHENG ELECTRI-POWER ENERGY-SAVING EQUIPMENT Co Ltd
Priority date: 2005-05-09
Filing date: 2005-05-09
Publication date: 2006-06-28
Anticipated expiration: 2015-05-09

Abstract

The utility model relates to a fluorescent lamp ballast. The utility model comprises a rectifying filtering circuit, a parallel connection push-pull circuit and a high-frequency output circuit, and high-frequency oscillating square waves generated by the parallel connection push-pull circuit which is composed of electronic components Q1, Q2, etc. are supplied to loads as an excitation source through L3 and L4. Before a lamp tube is lighted, a large resonance current formed by C6, L4, C5, etc. flows through a fluorescent lamp filament so that the lamp tube is excited to be lighted; because an oscillation pipe adopts RC coupling, the emitter is added with a feedback resistor, so an oscillation current is obviously reduced, and thus the purposes of long service life of the ballast and favorable energy-saving effect are achieved.

Description

Fluorescent lamp ballast

Technical field

Originally utility model discussion newly is a kind of ballast of fluorescent lamp.

Background technology

At present, the electric ballast of existing fluorescent lamp on the market, the general push-pull circuit rear drive high frequency of earlier the commercial power rectification step-down being used is exported, reach the effect of build-up of luminance economize on electricity, because this electron-like ballast has the advantage that circuit is simple, power savings is good, so use very extensively, but some is because of the factor of line design, exists long deficiency in useful life.

Summary of the invention

The technical problem that the utility model fluorescent lamp ballast will solve is to overcome existing electric ballast not long deficiency in useful life, and a kind of employing parallel pushpull circuit is provided, and oscillating current is little, long service life, the fluorescent lamp ballast that power savings is good.

The utility model fluorescent lamp ballast, it comprises: current rectifying and wave filtering circuit, parallel pushpull circuit, the LC output circuit that vibrates, resistance R 1 is connected in the ac circuit of rectification circuit, and the power of electrical network is compensated.Current rectifying and wave filtering circuit is made up of bridge rectifier and filter capacitor C1, and civil power is exported steady direct current after rectification, filtering.The parallel pushpull circuit is by triode Q1, Q2, diode D5, D6, capacitor C 2, C3, C4, resistance R 2, R3, R4, R7, R8, high-frequency transformer coils L1, L2 form, high frequency transformer has three groups of outputs, be L1, L2, L3, L1, L2 make the current feedback coil of two amplifier tubes, and the tail of inductance coil L1 connects the head of inductance coil L3 and makes central point.LC vibration output circuit is by capacitor C 5, C6, choke L4 forms, parallel pushpull circuit, LC vibration output circuit specifically connect: the emitter connecting resistance R4 of triode Q2, base stage connects on-off circuit that D6 connects with R6, meet current feedback circuit, connecting resistance R9 that capacitor C 4 and resistance R 8 are connected with inductance coil L2, collector electrode connects the tail of inductance coil L1 and the point of contact of inductance coil L3 head is a central point, the other end of R9 also connects this point, (-) of another termination rectifying and wave-filtering output of R4, R6, L2; The collector electrode of triode Q1 meets (+) of rectifying and wave-filtering output, emitter connecting resistance R3, base stage connects on-off circuit that D5 connects with R5, connect the current feedback circuit that capacitor C 3 and resistance R 7 are connected with inductance coil L1 head, collector electrode connection circuit R3, another termination central point of R5, R3; (+) of capacitor C 2, resistance R 2 back in parallel one termination rectifying and wave-filtering outputs, another termination central point, capacitor C 6 connects 2,4 pin of Filament of fluorescent lamp, 3 pin of capacitor C 5 one termination Filament of fluorescent lamp, (+) of another termination rectifying and wave-filtering output, choke L4 one end is connected with the tail of inductance coil L3,1 pin of another termination Filament of fluorescent lamp.

The utility model fluorescent lamp ballast; simple in structure; 1 pair of electrical network of insurance resistance R shields; the higher-order of oscillation square wave that the parallel pushpull circuit of being made up of Q1, Q2 produces adds to load through L3, L4 and makes driving source; form very big resonance current by C6, L4, C5 etc. before the lamp tube starting and flow through fluorescent wire, fluorescent tube is excited light, after lighting; C6 is inoperative substantially, and L4, C5 then play the choked flow effect.Because oscillating tube adopts the RC coupling, emitter adds feedback resistance, and oscillating current is significantly reduced, thereby reaches the ballast long service life, the purpose of good energy-conserving effect.

Description of drawings

Fig. 1 the utility model fluorescent lamp ballast electrical schematic diagram.

Embodiment

In conjunction with Fig. 1 concrete enforcement of the present utility model is described further:

High frequency transformer is that elder generation is around two groups of coils on the bar magnet of 5*10, and every group 5 circle made L1, L2 makes L3 around 3 circles in addition again, high frequency choke coil L4 adopts commercially available, C1:10u/400V, C2:222, C3:2.2u/50V, C4:2.2u/50V, C5:104/400V, C6:562/1000V, R1:1 Ω, R2:680K, R3:0.5 Ω, R4:0.5 Ω, R5:36 Ω, R6:36 Ω, R7:22 Ω, R8:22 Ω, D1-D6:1N4007, Q1, Q2:13003, it is whole that diode D1-D4 is connected into bridge, resistance R 1 is serially connected in the whole ac power supply circuit of bridge, and capacitor C 1 is connected on the two ends of bridge rectifier output, does filtering.With resistance R 4 one termination direct currents (-), the emitter of another termination triode Q2, (-) of D6, R6 series connection back D6 connects the base stage of triode Q2, R6 connects direct current (-), connect successively (-) of back C4 of C4, R8, L2 connect the base stage of Q2, the head of L2 meets (-) of direct current, and with the base stage of resistance R 9 one termination Q2, the tail of another termination inductance coil L1 and the point of contact of inductance coil L3 head are central point.The emitter of R3 one termination triode Q1, another termination central point; (-) of D5, R5 series connection back D5 connect the base stage of triode Q1, R5 connects central point, head series connection successively with capacitor C 3, resistance R 7, inductance coil L1, (-) of C3 connects the base stage of Q1, the tail of L1 connects central point, collector electrode connects direct current (+), with (+) of capacitor C 2, resistance R 2 backs in parallel one end direct current, another termination central point.Output: capacitor C 6 connects 2,4 pin of Filament of fluorescent lamp, 3 pin of capacitor C 5 one termination Filament of fluorescent lamp, (+) of another termination direct current, the tail of choke L4 one termination inductance coil L3,1 pin of another termination Filament of fluorescent lamp.

Claims

1, fluorescent lamp ballast, it comprises: current rectifying and wave filtering circuit, parallel pushpull circuit, high-frequency output circuit, its feature: the parallel pushpull circuit is by triode Q1, Q2, diode D5, D6, capacitor C 2, C3, C4, resistance R 2, R3, R4, R7, R8, high-frequency transformer coils L1, L2 form, and high frequency transformer has three groups of outputs, i.e. L1, L2, L3, L1, L2 make the current feedback coil of two amplifier tubes, the tail of inductance coil L1 connects the head of inductance coil L3 and makes central point, and LC vibration output circuit is by capacitor C 5, C6, and choke L4 forms; Parallel pushpull circuit, LC vibration output circuit specifically connect: the emitter connecting resistance R4 of triode Q2, base stage connects on-off circuit that D6 connects with R6, meet current feedback circuit, connecting resistance R9 that capacitor C 4 and resistance R 8 are connected with inductance coil L2, collector electrode connects the tail of inductance coil L1 and the point of contact of inductance coil L3 head is a central point, the other end of R9 also connects this point, (-) of another termination rectifying and wave-filtering output of R4, R6, L2; The collector electrode of triode Q1 meets (+) of rectifying and wave-filtering output, emitter connecting resistance R3, base stage connects on-off circuit that D5 connects with R5, connect the current feedback circuit that capacitor C 3 and resistance R 7 are connected with inductance coil L1 head, collector electrode connection circuit R3, another termination central point of R5, R3; (+) of capacitor C 2, resistance R 2 back in parallel one termination rectifying and wave-filtering outputs, another termination central point, capacitor C 6 connects Filament of fluorescent lamp (2), (4) pin, (3) pin of capacitor C 5 one termination Filament of fluorescent lamp, (+) of another termination rectifying and wave-filtering output, choke L4 one end is connected with the tail of inductance coil L3, (1) pin of another termination Filament of fluorescent lamp.

2, fluorescent lamp ballast according to claim 1, its feature: foregoing circuit also comprises resistance R 1, resistance R 1 series connection is in the ac circuit of current rectifying and wave filtering circuit.