CN2308223Y

CN2308223Y - High-power factor low harmonic multitube ballast

Info

Publication number: CN2308223Y
Application number: CN 96233222
Authority: CN
Inventors: 吴健国; 谢世谊
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-06-07
Filing date: 1996-06-07
Publication date: 1999-02-17
Anticipated expiration: 2006-06-07

Abstract

The utility model relates to a power factor multi-tube ballast which uses a passive filter to replace an active filter. The utility model is composed of a rectification circuit, a passive filter, a zero-voltage cutoff high-frequency inverter circuit and an isolation output lamp group circuit. Power supply voltage output half-wave DC voltage through high-frequency filter rectification, a passive filter circuit can be used for achieving the goal that the power factor of the output current is larger than 0.95 and the harmonic of the output current is less than 32%, and pulse direct current voltage is obtained, is output by voltage to the zero-voltage high-frequency inverter circuit and is oscillated and output by an inversion tube into 500 volts high-frequency alternating current after isolated voltage transformation to ignite four fluorescent lamps. The utility model has the characteristics of low harmonic, high power factor, simple circuit, high reliability, long service life, low energy consumption and low cost.

Description

High Power Factor low-harmonic ballast

The utility model relates to a kind of High Power Factor low-harmonic ballast, belongs to the ballast technology of fluorescent-lamp-use.

The major defect of present electronic ballast for fluorescent lamps is that the harmonic current of supply electrical network is too high and power factor is low, general sinusoidal aberration rate is greater than 100%, power factor is below 70%, and secondly transistor of vibration also exists the big and thermal losses of power consumption to cause ballast to damage easily.In Chinese patent 92203471.0 " a kind of electronics high frequency ballast " of record, " wattage dimmable electronic ballast " all belongs to electric ballast in 91217497.8, has above-mentioned deficiency equally.In 94230085.8 " low-harmonic integrated-circuit ballast " of record although can meet the demands, the chopper stabilivolt circuit that it adopts, complex structure needs power consumption, the cost height is not easy to apply at home.

The purpose of this utility model is to provide a kind of High Power Factor low-harmonic ballast, circuit is simple, power consumption less, cost is low, be convenient to promote the use of.

A kind of High Power Factor low-harmonic of the utility model ballast, by High frequency filter (1), full-wave rectifying circuit (2), no-voltage is turn-offed high-frequency inverter circuit (4) and is isolated output lamp group circuit (5) and form, it is characterized in that having one by capacitor C 1, C2, diode D1, D2, the passive filter (3) that D3 and resistance R 1 are formed, its C1 upper end is connected with the positive supply of D1 negative terminal with full-wave rectifying circuit (2) output, the C2 lower end is connected with the negative supply of D2 anode with full-wave rectifying circuit (2) output, the C1 lower end, the D2 negative terminal is connected with the R1 right-hand member, the R1 left end is connected with the D3 anode, and the D3 negative terminal is connected with the C2 upper end with the D1 anode.

A kind of High Power Factor low-harmonic ballast that provides by the utility model, adopted passive filter, circuit structure is simple, power consumption is few, the reliability height, and the life-span is long, cost is low, power factor (PF) is greater than 95%, and second harmonic is less than 1%, and triple-frequency harmonics is less than 24%, sinusoidal aberration rate is less than 32%, and is easy to utilize.

The utility model has following accompanying drawing:

Fig. 1: the circuit theory diagrams of High Power Factor low-harmonic ballast

Fig. 2: voltage, the current waveform figure of the passive filter of High Power Factor low-harmonic ballast.

The embodiment of the utility model High Power Factor low-harmonic ballast is described with reference to the accompanying drawings.Circuit theory diagrams as shown in Figure 1 are made up of high frequency filter (1), full-wave rectifying circuit (2), passive filter (3), no-voltage shutoff high-frequency inverter circuit (4) and isolation output lamp group circuit (5).High frequency filter is by filter inductance L1, capacitor C 3, and fuse F forms, and full-wave rectifying circuit is made up of the ZL rectistack.Passive filter (3) is made up of capacitor C 1, C2, diode D1, D2, D3 and resistance R 1, the upper end of C1 is connected with the positive supply of D1 negative terminal with full-wave rectifying circuit (2) output, the C2 lower end is connected with negative supply with the D2 anode, C1 lower end, D2 negative terminal are connected with the R1 right-hand member, the R1 left end is connected with the D3 anode, and the D3 negative terminal is connected with the C2 upper end with the D1 anode.Supply voltage is 100 hertz of half-wave DC voltage U 2 through full-wave rectification, shown in (a) figure among Fig. 2, its peak value is UP, during the U2 instantaneous value is greater than 0.5Up, directly turn-off high-frequency inverter circuit (4) power supply, simultaneously in passive filter (3), by C1 to no-voltage, R1, D3, the C2 loop is to C1 and C2 charging, and electric current I 2 waveforms are shown in (b) among Fig. 2; After the U2 instantaneous value is less than 0.5Up, supply with no-voltage shutoff high-frequency inverter circuit (4) through D2 and C2 through the D1 discharge loop by C1, its voltage waveform U is shown in (c) among Fig. 2.As seen from Figure 2,2 duration of the electric current I broadening of being supplied with by rectifier (also being power supply) is to the centre of voltage U 2 waveforms, and reaches three/two cycles, reached the purpose that improves power factor and minimizing harmonic wave.No-voltage is turn-offed high-frequency inverter circuit (4) by capacitor C 4-C8, resistance R 2-R10, diode D4-D8, pliotron BG1.BG2. trigger tube Tr, reactor T1, the elementary and feedback winding T2-1.T2-2 composition of isolating transformer T2 is formed oscillator by BG1.BG2, drive by feedback winding T2-2, T2-1 among the isolating transformer T2 respectively, form the circuits for triggering of BG2 by resistance R 7, R8, capacitor C 8, diode D5 and trigger tube Tr.By isolating transformer T2, by the right-hand member of its secondary winding, be connected with the right-hand member of fluorescent lamp through shunt capacitance C9-C12, the left end of its secondary winding connects to form with the left end of two one group fluorescent lamp in parallel isolates output lamp group circuit (5).

Because the power factor of national Specification electric ballast should be greater than 85%, second harmonic is less than 5% in the harmonic content, and triple-frequency harmonics is less than 37%, by the High Power Factor low-harmonic ballast that the utility model provides, its power factor is greater than 95%, and second harmonic is less than 1%, triple-frequency harmonics is less than 24%, and sinusoidal aberration rate has met request of national standard fully less than 30%, and it is simple in structure, cost is low, and power consumption is few, the reliability height, life-span is long, and application value is arranged greatly.

Claims

1, High Power Factor low-harmonic ballast, by High frequency filter (1), full-wave rectifying circuit (2), no-voltage is turn-offed high-frequency inverter circuit (4) and is isolated output lamp group circuit (5) and form, it is characterized in that having one by capacitor C 1, C2, diode D1, D2, the passive filter (3) that D3 and resistance R 1 are formed, its C1 upper end is connected with the positive supply of D1 negative terminal with full-wave rectifying circuit (2) output, the C2 lower end is connected with the negative supply of D2 anode with full-wave rectifying circuit (2) output, the C1 lower end, the D2 negative terminal is connected with the R1 right-hand member, the R1 left end is connected with the D3 anode, and the D3 negative terminal is connected with the C2 upper end with the D1 anode.