CN2155654Y - Electronic ballast with compensated high-power factor - Google Patents

Abstract

The utility model relates to an electronic ballast with compensated high-power factors. One end of a choke coil (4) is connected in parallel with field effect transistors (9), (18), a diode (10), a transformer (11) and resistors (19), (20) through a diode in the high power factor circuit of the electronic ballast of a fluorescent lamp. The other end is connected in parallel with a capacitor (7) and a diode (6). A capacitor (8) is connected in parallel with both ends of a rectifying circuit. A compensation capacitor (13) is communicated with the B end of the primary side of the transformer (11). The power factor can be enhanced by more than 90%. The utility model has the advantages of good glow-starting performance, low cost and high compatibility. The utility model is suitable for various fluorescent lamps with 120V and 220V and energy saving lamps with three primary colors.

Description

Electronic ballast with compensated high-power factor

The utility model relates to a kind of electronic ballast for fluoresent lamp, particularly is applicable to three-basic-colour lamp, the electric ballast of band neon bulb three-basic-colour lamp and fluorescent lamp.

At present, generally all about 60%, in order to improve the power factor of electric ballast, people have taked certain methods to the power factor of the electronic ballast for fluoresent lamp that sell in market, as adopt the field effect transistor high power factor circuit, the ballast power factor is brought up to about 90%.But this method cost makes ballast involve great expense than higher.

For rated voltage is the ballast of 120V, and when voltage fluctuation, electric current is also along with fluctuation, so the somebody takes the method for multiplication of voltage to solve this problem, but does the requirement of withstand voltage of components and parts just high like this.

The purpose of this utility model provides a kind of simple in structure, and element is few, and cost is low, power factor height, the electric ballast that starting performance is good.

The purpose of this utility model realizes in the following way, electric ballast is interior by a high power factor circuit of being made up of choke 4, diode 5, diode 6, electric capacity 7, electric capacity 8, choke 4 one ends join through diode 5 and field effect transistor 9,18, diode 10, transformer 11, the other end joins with electric capacity 7, diode 6, electric capacity 8 is in parallel with the rectification circuit two ends, and has a building-out capacitor 13 to communicate with transformer 11 former limit B ends.

Electric ballast belongs to capacitive load, its current phase is ahead of voltage, filter capacitor is big more, leading angle is just big more, power factor is just low more, and as Fig. 1, wherein curve i is a current waveform, curve v is a voltage waveform, in the utility model circuit, the anticipation of filter capacitor 7 has just in time been offset in the adding of choke 4, thereby makes input current and voltage-phase relatively near the power factor of ballast is improved a lot.For the effect that strengthens choke 4 should its furnishing is identical with ballast frequency, and isolate with diode.Electric capacity 8 is in parallel with rectification circuit two ends, and electric capacity 8 also can be connected in parallel on two ends of diode 6, and it all has bigger effect for the starter of circuit and to the filtering of ripple.

In rated voltage is 120 volts, fluorescent lamp power is on the utility model of 7-26 watt, building-out capacitor 13 1 ends and choke 12 and transformer 11 former limit B ends join, and the drain electrode of electric capacity 13 other ends and field effect transistor 9 and electric capacity 14 join or joins with electric capacity 14 and fluorescent tube 15.

In rated voltage is 120 volts, and fluorescent lamp power is more than 26 watts or rated voltage is 220 volts, and fluorescent lamp power is on the utility model of 8-100 watt, and two ends are leaked in the source that building-out capacitor 13 is connected in parallel on field effect transistor 9.

After the ballast starter, electric current increases with voltage, and after 180 volts, voltage increases, and electric current has just increased seldom, as shown in Figure 2 curve.Wherein i is the electric current change curve.

The starting voltage of electric ballast is generally all a lot of less than operating voltage, has only about the 80-100 volt.Except that the moment impact electric current, normal current is still smaller when starter, and this is also mutually far short of what is expected from operating voltage, electric current.Behind electric capacity 13 on the transformer 11 former limit B terminations, give its bias voltage, like this, voltage is in change procedure, although the voltage at transformer 11 former limit A, B end place all changes, the voltage that the difference of its variation promptly is added on the former limit is stable.Correctly select the value and the connection of electric capacity 13, just can make ballast operating voltage operating current when changing in a big way constant substantially.

When 120 volts of line voltages, electric ballast just in time is operated in the interval that electric current and change in voltage increase in proportion, during the net change in voltage, electric current changes thereupon, so variable power is just bigger, this is very disadvantageous to ballast, increases by 10% so the national regulation that has goes out voltage, and the power increase must not surpass 10% index.At this moment the utility model electric capacity 13 1 ends and choke 12 and transformer 11 former limit B ends should be joined for the fluorescent tube of 7-26W, the drain electrode of the other end and field effect transistor 9 and electric capacity 14 join or join with electric capacity 14 and fluorescent tube 15 and all can.Make electric capacity 13 directly give transformer 11 former limit B ends a bias voltage.The later electric current of starter almost is exactly an operating current like this.Make the utility model be operated in electric current and change stably in the curve interval, this just makes that the utility model starter ability is strong, and is compatible good.For 120 volts of situations more than the 26W, the utility model electric capacity can be about to the leakage two ends, source that electric capacity 13 is connected in parallel on field effect transistor 9 by 220 volts connection.

The utility model easily because of external interference quits work and the situation that itself becomes the electronic jamming source, has added piezo-resistance 16 and low pass filter 17 at its input in conjunction with ballast.

Advantage of the present utility model is:

1, power factor height 〉=90%

2, starting performance is good, for rated voltage is 120 volts, the utility model of 7-26 watt, its starting voltage is about 80 volts, operating current rises to from 90 volts at voltage to be stablized constantly in 150 volts of intervals, be 220 volts for rated voltage, and power is the utility model of 8-1000W, its starting voltage is about 120 volts, and operating current is stablized constant in 180 volts of-240 volts of intervals.

3, third-harmonic component ∠ 30%

4, compatible performance is good, and the utility model for 120 volts, 7-26 watt can start the triphosphor tube light of 7-13 watt of band neon bulb and various 7-26 watt trichromatic energy saving lamp and fluorescent lamp.For the utility model of 220 volts, can start 8-100 watt various fluorescent lamps and trichromatic energy saving lamp.

5, deglitch disturbs, and disturbs little to external world.

Description of drawings:

Fig. 1, be the oscillogram of ordinary electronic ballast electric current leading voltage.

Fig. 2, be after the common ballast starter, electric current increases the curve chart that changes with voltage.

Fig. 3, be the electronic-circuit diagram of the utility model 120V, 7-26W.

Fig. 4, be the phase waveform figure of electric current and voltage in the utility model 120V, the 7-26W electronic circuit.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Fig. 1, Fig. 2, the existing introduction, no longer repetition here in front.

The utility model 120V, 7-26W electronic circuit as shown in Figure 3, by diode bridge rectifier circuit 1, high-power factor circuit 2 and field effect transistor, transformer starts and resonant circuit 3 is formed.High power factor circuit is made of choke 4, diode 5,6, electric capacity 7,8, choke 4 one ends are in parallel with field effect transistor 9,18, diode 10, transformer 11 and resistance 19,20 through diode 5, its other end is with electric capacity 7 diodes 6 and connect, electric capacity 8 is in parallel with diode rectifier circuit 1 two ends, choke 4 is selected the I shape magnetic core of diameter 12 for use, and 0.23 millimeter enamelled wire twines to be made.It is identical with the utility model operating frequency that its frequency transfers to.Diode 5 is preferably selected switching diode such as FR107 etc. for use, and electric capacity 7 adopts dielectric capacitance CD11-10UF-47UF, and electric capacity 8 adopts electric capacity of the dacron CL21(0.047-0.47), diode 6 is selected rectifier diode 1N4002-1N4004 for use.

Be parallel with a building-out capacitor 13 at the former limit B end of transformer 11 and the junction of choke 12, electric capacity 13 other ends can join with the drain electrode and the electric capacity 14 of field effect transistor 9, also can join with electric capacity 14 and fluorescent tube 15.Transformer is dicyclo 7 * 2:4, and choke 12 is the magnetic narrow-necked earthen jar of diameter 8, and 0.23 millimeter enamelled wire coiling forms.Electric capacity 13 adopts electric capacity of the dacron CBB21, and 2N2-8N2 has added piezo-resistance 16 and low pass filter 17 at the input of circuit, and piezo-resistance 16 is 271V, and low pass filter 17 adopts the I shape magnetic core of diameter 12, and 0.23 millimeter enamelled wire twines to be made.Fluorescent tube 15 can be fluorescent lamp or the trichromatic energy saving lamp of 7-26W, or 7-13W band neon bulb trichromatic energy saving lamp.

Energized, but when voltage is 80 volts the fluorescent tube starter, fluorescent tube is started working.When voltage is increased to 150 volts, lamp works is still normal, lights at electricity-saving lamp and tests later in 15 minutes.Electric current is with the result of variations such as the following table of voltage, (is example with the 18W fluorescent tube):

Voltage V 80 100 110 120 130 140 150

Electric current NA 140 140 140 139 138 138 138

Its circuit power factor is 94%, and third-harmonic component is less than 30%, the phase waveform of its electric current and voltage such as Fig. 4.Curve i is a current waveform among the figure, and curve v is a voltage waveform.

220 volts of the utility model, 8-100 watt of electronic circuit and Fig. 3 do not have anything to change aspect high power factor circuit, and just the model and the shell dimension of element change to some extent.But connection and model at the former limit B end of transformer 11 building-out capacitor 13 in parallel change to some extent, and electric capacity 13 changes the source-drain electrode two ends that are connected in parallel on field effect transistor 9 into.At 11 pairs of limit C ends of source terminal and transformer and choke 12 and connect.Communicate with the former limit B end of transformer 11 through choke 12.

Connect 220 volts of power supplys, fluorescent tube gets final product starter when voltage is 120 volts, and it is normal that voltage is raised to 250 volts of lamp works.Its electric current changes still within normal allowed band.Its circuit power factor 94%.Third-harmonic component is less than 30%.

Claims (4)

1, high power factor electronic ballast, by rectification circuit, field effect transistor, transformer starts, resonant circuit and housing are formed, it is characterized in that: have one by choke (4), diode (5), (6), electric capacity (7), (8) high power factor circuit of Zu Chenging, choke (4) one ends are through diode (5) and field effect transistor (9), (18), diode (10), transformer (11) joins, its other end and electric capacity (7), diode (6) joins, electric capacity 8 is in parallel with rectification circuit (1) two ends, and has a building-out capacitor (13) to communicate with the former limit B end of transformer (11).

2, electric ballast according to claim 1, it is characterized in that: in rated voltage is that 120 volts, fluorescent lamp power are the 7-26 watt-hour, the former limit B of building-out capacitor (13) one ends and choke (12) and transformer (11) end joins, and electric capacity (13) other end drains with field effect transistor (9) and electric capacity (14) joins or join with electric capacity (14) and fluorescent tube (15).

3, electric ballast according to claim 1, it is characterized in that: in rated voltage is that 120 volts, fluorescent lamp power are more than 26 watts or rated voltage is that 220 volts, fluorescent lamp power are the 8-100 watt-hour, building-out capacitor (13) is connected in parallel on the leakage two ends, source of field effect transistor (9), and electric capacity (13) communicates with the B end on the former limit of transformer (11) through choke (12).

4, according to the described electric ballast of claim 1-3, it is characterized in that: electric capacity (8) is connected in parallel on two ends of diode (6).

Images