CN2612205Y

CN2612205Y - Dual-purpose electronic ballast for fluorescent lamp and gas discharge lamp

Info

Publication number: CN2612205Y
Application number: CN03242397.7U
Authority: CN
Inventors: 李名酉; 何超
Original assignee: TAIGEFENGLIAN SCI-TECH DEVELOPMENT CO Ltd
Current assignee: Taitong Lighting Technology Co., Ltd., Beijing
Priority date: 2003-03-26
Filing date: 2003-03-26
Publication date: 2004-04-14
Anticipated expiration: 2013-03-26

Abstract

The utility model relates to a dual-purpose electronic ballast for fluorescent lamps/gas discharge lamps, which is designed to improve the existing "electronic ballasts for gas discharge lamps" circuit and can be used for both gas discharge lamps and fluorescent lamps. It includes a sequentially connected DC power supply circuit, a passive power factor correction circuit, an inverter circuit and a step-up starter circuit. The DC power supply circuit is composed of a low-pass filter circuit and a diode bridge rectifier circuit to complete the AC-DC conversion; the passive power factor correction circuit can be composed of a typical flow-by-flow circuit, which is used to improve the utilization of the power grid and reduce the impact of the ballast on the power grid. Power grid interference; the inverter circuit can use a push-pull or half-bridge modified Lauyer sine wave oscillator circuit to convert the input signal into a high-frequency and high-voltage sine wave signal; the boost starter circuit uses multiple isolation transformers, and the primary The windings are connected in parallel and the secondary windings are connected in series to boost the output of the transformer to start the discharge lamp, or preheat the filament to ignite the fluorescent lamp by adding a secondary winding.

Description

Fluorescent lamp/gaseous discharge lamp dual-purpose electronic ballast

Technical field

The utility model relates to a kind of electric lighting device, relates to a kind of being suitable for and high-intensity discharge lamp and the matching used low-cost dual-purpose electronic ballast of fluorescent lamp or rather.

Background technology

High-intensity gas discharge lamp (HID), also claim high intensity gas-discharge lamp or high-voltage gas discharging light, it is purposes novel energy-saving electric light source very widely, electric ballast matching used with it, particularly high-power, high strength, electric ballast then is the problem of each R﹠D institution and the research of light source manufacturer always cheaply.

The core technology of current electronic ballast for gas discharging lamp roughly has following four aspects: when lighting the HID lamp with high-frequency signal how by some special technique measure solution sound problem of shaking; Because driving the switching tube of HID lamp starter is operated under the high frequency state, for avoiding excessive high-frequency loss, need select expensive high-grade switching tube for use, adopt protective circuit for tackling various abnormal conditions, these technical measures all can cause the electric ballast cost to increase, and therefore must effectively solve the cost problem of electron rectifier; Solve the high-frequency signal how to produce the driving switch pipe and the problem of the protective circuit of reliable design how; How to improve the functional reliability problem of circuit of electronic ballast.But generally speaking, because will comprehensively solve the technical problem of above four aspects, and make circuit of electronic ballast more complicated, cost is too high, is unfavorable for promoting the use of of product.

Chinese patent 02232558.1 " electronic ballast for high-strength gas discharge lamp cheaply ", on the basis of taking a series of technological improvement measures, solved the problem of above four aspects preferably, under the condition that guarantees existing electric ballast performance and parameter, simplified circuit design greatly and reduced product cost.But blemish in an otherwise perfect thing is the straight tube fluorescent lamp that its circuit design can not be used for accounting in the market suitable share.

Because straight tube fluorescent lamp belongs to cathode preheat actuated type electric light source, usually adopt the electrode field emission that causes by high open circuit voltage to make the hard reboot mode of lamp triggering, because cathode emission material reaches the thermionic emission state that is higher than 700 ℃ far away, and high voltage can not puncture fluorescent tube in a short period of time, so fluorescent tube must bear one section glow discharge time and carry out the transition to arc discharge again, thereby cause the serious sputter of cathode emission material, make lamp tube ends filament tube wall on every side early stage blackout occur, cause fluorescent tube shortening in useful life.

The utility model content

The purpose of this utility model is design a kind of fluorescent lamp/gaseous discharge lamp dual-purpose electronic ballast, on existing " electronic ballast for high-strength gas discharge lamp cheaply " circuit design basis, by the property improved design, make it to be used for gaseous discharge lamp, can be used for fluorescent lamp again, the characteristics that further reduce the ballast volume, reduce product cost and raising reliability are arranged simultaneously.

The purpose of this utility model is achieved in that a kind of fluorescent lamp/gaseous discharge lamp dual-purpose electronic ballast, comprises DC power supply circuit, passive power factor correcting circuit, the inverter circuit and the starting circuit that boosts; Passive power factor correcting circuit connects DC power supply circuit output, and inverter circuit connects passive power factor correcting circuit output, and the starting circuit that boosts connects inverter circuit output; The starting circuit that boosts connects gaseous discharge lamp or Filament of fluorescent lamp.

DC power supply circuit wherein can be connected and composed by low-pass filter circuit and diode bridge rectifier circuit, finishes the conversion of AC to DC; Passive power factor correcting circuit can be made of typical current follow-up circuit, is used to improve utilance and the interference of reduction ballast to electrical network to electrical network; Inverter circuit can adopt push-pull type modification Lao Yeer sine wave oscillation circuit, also can adopt semibridge system modification Lao Yeer sine wave oscillation circuit, and input signal is become the high-frequency and high-voltage sine wave signal; The starting circuit that boosts then adopts a plurality of isolating transformers, and the series connection of elementary winding parallel connection, secondary winding, carries out the transformer output of boosting, when needing to connect fluorescent lamp, by set up winding confession preheating filament in Secondary winding of transformer.

The utility model, on the basis of existing electronic ballast for gas discharging lamp circuit design, design electronic ballast for fluorescent lamps and electronic ballast for high-strength gas discharge lamp cheaply, under the condition that guarantees existing electric ballast performance and parameter, further reduce product cost and improved the ballast quality, prolonged useful life.Can use for gaseous discharge lamp or the fluorescent lamp of 120V, 220V.

Description of drawings

Fig. 1 is fluorescent lamp/gaseous discharge lamp dual-purpose electronic ballast principle structure block diagram;

Fig. 2 is the 120V electronic ballast for fluorescent lamps circuit theory diagrams that adopt Fig. 1 principle design;

Fig. 3 is the 120V electronic ballast for high-strength gas discharge lamp circuit theory diagrams that adopt Fig. 1 principle design;

Fig. 4 is the 220V electronic ballast for fluorescent lamps circuit theory diagrams that adopt Fig. 1 principle design.

Embodiment

Below the embodiment circuit of given three electric ballasts, be respectively the circuit of electronic ballast of lighting 120V and 220V fluorescent lamp, shown in Fig. 2,4 and light the circuit of electronic ballast of 120V gaseous discharge lamp (HID) lamp, as shown in Figure 3.

Referring to Fig. 1 and in conjunction with referring to Fig. 2 to Fig. 4.Fluorescent lamp of the present utility model/gaseous discharge lamp dual-purpose electronic ballast, being linked in sequence by DC power supply circuit 11, passive power factor correcting circuit 12, inverter circuit 13 and the starting circuit 14 that boosts forms.

DC power supply circuit 11 wherein is used for 120V or 220V AC power are transformed to DC power supply output.In three embodiment, adopted identical circuit structure, connected and composed by intercoupling type low-pass filter circuit and diode bridge rectifier circuit.The intercoupling type low-pass filter circuit is connected and composed by piezo-resistance VR1, capacitor C1, C2, co-mode coil L1, and other uses capacitor C3, C4 can reduce the high-frequency electromagnetic interference of electric ballast to other electronic equipments.D1 to D4 connects and composes diode bridge rectifier circuit by diode, finishes the conversion of AC to DC, and when input voltage was 120V and 220V, the output crest voltage was respectively 150V and 300V.

Passive power factor correcting circuit 12, in three embodiment, also adopted identical circuit structure, adopt the current follow-up circuit of typical no high-frequency energy feedback fraction, connect and compose by diode D5 to D7, resistance R 1, capacitor C 5, C6, be used to improve utilance and the interference that reduces electrical network to electrical network, this partial circuit can be brought up to power factor more than 0.96.

Inverter circuit 13 is said on the whole, has all adopted modification Lao Yeer sine wave oscillation circuit in three embodiment, but when the electric ballast input voltage is the 120V interchange, adopts push-pull circuit, implements circuit shown in Fig. 2,3; When the electric ballast input voltage is the 220V interchange, adopt half bridge circuit, implement circuit as shown in Figure 4.

The starting circuit 14 that boosts also is the transformer output circuit, wherein is respectively applied for 120V, 220V fluorescent lamp by Fig. 2, the starting circuit that boosts shown in Figure 4, then is used for the 120V gaseous discharge lamp by the starting circuit that boosts shown in Figure 3.

Referring to Fig. 2, connect and compose push-pull type modification Lao Yeer sine wave oscillation circuit by first, second MOS transistor Q1, Q2 and peripheral cell L2, R2, R3, R4, Z1, C7 etc.Electric current produces sinusoidal signals through inductance L 2, is connected to form push-pull type modification Lao Yeer vibration with main coil N1, N2, the capacitor C7 of metal-oxide-semiconductor Q1, Q2, primary winding, will import square wave (50-60Hz) and become high_frequency sine wave (greater than 90KHz).The starting circuit that boosts adopts transformer T1, T2, adopts a plurality of isolating transformer outputs, and its elementary winding comprises main coil N1, N2, N7, N8 and two secondary coil N3, N4 that realization is boosted and exported, and wherein N1 is in parallel with N7, and N2 is in parallel with N8.Secondary coil N3, N4, make it alternate conduction and end for first, second MOS transistor Q1, Q2 alternately provide grid voltage by resistance R 3, R4.Secondary winding N5, N6, N9, N10 series connection, winding N6, N10 connect the filament at fluorescent lamp tube two ends, and filament is carried out pipeline start up by preheating, through preheating, make negative electrode possess the good electron launching condition, can reduce starting resistor and prolonging lamp tube service life significantly.Capacitor C 8 can be used for adjusting power output.

In the diagram circuit; inductance L 2 one end ground connection only need be born the voltage less than 200V (peak-to-peak value), and its negative feedback; can protect metal-oxide-semiconductor; damage because of instantaneous overcurrent causes the metal-oxide-semiconductor grid when avoiding starting shooting, moreover, can make ballast that withstand voltage, the inductance value of inductance are required to reduce greatly inductance L 2 one end ground connection; so can use light and handy magnetic material; thereby help reducing the volume of ballast, reduce cost, product reliability is improved.Adopt the output of a plurality of isolating transformers, elementary winding parallel connection, secondary winding series connection both can guarantee can not break down when the output short circuit, volume of transformer is dwindled and then reduce product cost.

Referring to Fig. 3, only be to have lacked in the secondary winding filament preheating circuit (few N6, N10) with the difference of Fig. 2 circuit, be directly used in and start the 120V gaseous discharge lamp.

Referring to Fig. 4, by cotype inductance L 2, first, second MOS transistor Q1, Q2 that source, drain electrode are connected in series and main winding N1, the N6 of transformer T1, T2, capacitor C11 etc. connects and composes semibridge system modification Lao Yeer sine wave oscillation circuit, will import square wave and become high_frequency sine wave.The primary and secondary coil of cotype inductance L 2 connects the positive and negative extreme of passive power factor correcting circuit and semibridge system modification Lao Yeer sine wave oscillation circuit respectively.Secondary coil N2, the N3 of transformer T1, the elementary winding of T2 provides grid voltage by resistance R 3, R4 for first, second metal-oxide-semiconductor respectively.Resistance R 2, capacitor C 10, diode D10 and D9 connect and compose circuits for triggering, by to the discharging and recharging of capacitor C 10, and for the second MOS transistor Q2 provides the triggering starting resistor, and the holding circuit vibration.Diode D8, resistance R 6 provide discharge path for capacitor C 10 when Q2 ends.The passive power factor correcting circuit output is connected with capacitor C7, C8, and its serial connection point is the current potential output mid point end of current follow-up circuit, output midpoint potential.

The starting circuit that boosts adopts transformer T1, T2, adopts a plurality of isolating transformer outputs, and its elementary winding comprises main coil N1, N6 and two secondary coil N2, N3 that realization is boosted and exported, and wherein N1 is in parallel with N6.Secondary winding N4, N7, N5, N8 series connection, winding N8, N5 connect the filament at fluorescent lamp tube two ends, and filament is carried out pipeline start up by preheating, through preheating, make negative electrode possess the good electron launching condition, can reduce starting resistor and prolonging lamp tube service life significantly.Capacitor C 12 can be used for adjusting power output.

In the diagram circuit, between the mid point of circuit anode and Q1, Q2, be added with resistance R 5, make Q2 after triggering, form self-oscillation and normal the startup easily, guarantee the normal startup and the work of ballast, when turning off the light, also can scintillation not occur because of capacitor C 10 discharges.

Electric ballast of the present utility model, on the basis of existing electronic ballast for gas discharging lamp circuit structure, realized that through improving design fluorescent lamp and gaseous discharge lamp are dual-purpose, and under the condition that guarantees existing electric ballast performance and parameter, further reduce cost and improve the quality of ballast.Experimental result shows that enforcement circuit of the present utility model all can be up to state standards at aspects such as power factor, harmonic content and crest compare, and has occupied the advantage of widening market because of its dual-purpose characteristics.

Claims

1. A fluorescent lamp/gas discharge lamp dual-purpose electronic ballast is characterized in that: it comprises a DC power supply circuit, a passive power factor correction circuit, an inverter circuit and a step-up starter circuit; the passive power factor correction circuit is connected to the DC The output of the power supply circuit, the inverter circuit is connected to the output of the passive power factor correction circuit, the step-up starter circuit is connected to the output of the inverter circuit; the step-up starter circuit is connected to the gas discharge lamp or fluorescent lamp filament.

2. A dual-purpose electronic ballast for fluorescent lamps/gas discharge lamps according to claim 1, characterized in that: the inverter circuit is a push-pull modified Lauyer sine wave oscillation circuit, and the The voltage starter circuit is a transformer output circuit composed of the first and second isolation transformers.

3. A dual-purpose electronic ballast for fluorescent lamps/gas discharge lamps according to claim 2, characterized in that: said push-pull modified Lauyer sine wave oscillator circuit is composed of a first MOS transistor, a second MOS Transistors, inductors, capacitors, the main coil of the primary winding of the first isolation transformer are connected to the main coil of the primary winding of the second isolation transformer, and the main coils of the primary winding of the first and second isolation transformers are connected in parallel, and connected with the first and second The drains of the MOS transistors are connected in parallel with the capacitors, the two secondary coils of the primary winding of the first isolation transformer are connected to the gates of the first and second MOS transistors through resistors, and the sources of the first and second MOS transistors are connected to the inductors One end, the other end of the inductance is connected to the ground end; the secondary windings of the first and second isolation transformers are connected in series, and the coil windings for connecting the filaments at both ends of the fluorescent lamp are connected in series.

4. A fluorescent lamp/gas discharge lamp dual-purpose electronic ballast according to claim 2, characterized in that: said push-pull modified Lauyer sine wave oscillator circuit consists of a first MOS transistor, a second MOS Transistors, inductors, capacitors, the main coil of the primary winding of the first isolation transformer are connected to the main coil of the primary winding of the second isolation transformer, and the main coils of the primary winding of the first and second isolation transformers are connected in parallel, and connected with the first and second The drains of the MOS transistors are connected in parallel with the capacitors, the two secondary coils of the primary winding of the first isolation transformer are connected to the gates of the first and second MOS transistors through resistors, and the sources of the first and second MOS transistors are connected to the inductors One end, the other end of the inductor is connected to the ground end; the secondary windings of the first and second isolation transformers are connected in series and connected to the gas discharge lamp.

5. A dual-purpose electronic ballast for fluorescent lamps/gas discharge lamps according to claim 2, 3 or 4, characterized in that: the input end of the DC power circuit is connected to a 120V AC power supply.

6. A dual-purpose electronic ballast for fluorescent lamps/gas discharge lamps according to claim 1, characterized in that: said inverter circuit is a modified Lauyer sine wave oscillation circuit of half-bridge type, and said boost The voltage starter circuit is a transformer output circuit composed of the first and second isolation transformers.

7. A dual-purpose electronic ballast for fluorescent lamps/gas discharge lamps according to claim 6, characterized in that: said half-bridge modified Lauyer sine wave oscillator circuit consists of a first MOS transistor, a second MOS Transistors, inductors including primary and secondary coils, capacitors, the main coil of the primary winding of the first isolation transformer are connected to the main coil of the primary winding of the second isolation transformer; the primary coils of the primary windings of the first and second isolation transformers are connected in parallel and connected in parallel Capacitor; the first and second MOS transistors are connected in series, and the series connection point is connected to one end of the main coil of the first and second isolation transformers, and connected to the positive end of the passive power factor correction circuit through a resistor; the other end of the main coil of the first and second isolation transformers One end is connected to the potential output midpoint end of the passive power factor correction circuit; the primary and secondary coils of the inductor are respectively connected to the positive end and the negative end of the passive power factor correction circuit and the half-bridge modified Lauyer sine wave oscillation circuit; The two secondary coils of the primary winding of the first isolation transformer are connected to the gates of the first and second MOS transistors through resistors; the drains and sources of the first and second MOS transistors are respectively connected to the half-bridge modified Lauyer sine wave oscillation circuit The positive terminal and the negative terminal of the first and second isolation transformers are connected in series, and the coil windings for connecting the filaments at both ends of the fluorescent lamp are connected in series.

8. A dual-purpose electronic ballast for fluorescent lamps/gas discharge lamps according to claim 7, characterized in that: the potential output midpoint end of the passive power factor correction circuit is the serial connection end of two capacitors, The other ends of the two capacitors are connected to the output ends of the passive power factor correction circuit.

9. A dual-purpose electronic ballast for fluorescent lamps/gas discharge lamps according to claim 7, characterized in that: it also includes a triggering and starting circuit of MOS transistors, composed of a first resistor, a second resistor, a capacitor, Two-way diodes and diodes are connected; the first resistor is connected in series with capacitors, and connected between the positive and negative terminals of the half-bridge modified Lauyer sine wave oscillation circuit, and the series connection point is connected to the gate of a MOS transistor through a two-way diode , and the series point connecting the first and second MOS transistors through a diode; the second resistor is connected between the series connection point and the negative terminal of the half-bridge modified Lauyer sine wave oscillation circuit.

10. A dual-purpose electronic ballast for fluorescent lamps/gas discharge lamps according to claim 6, 7, 8 or 9, wherein the input end of the DC power circuit is connected to a 220V AC power supply.