CN2220145Y - Capacitive compensating gas discharge lamp ballast - Google Patents

Abstract

The utility model relates to a capacitive compensating gas discharge lamp ballast which is used for a metal halide lamp, a high-pressure sodium lamp and a mercury lamp. A working circuit is composed of a capacitor C< 1 >, a lamp tube D and an inductor L< 3 >. A power factor compensating and a filter circuit is composed of a capacitor C< 2 > and an inductor L< 2 >. A voltage boosting lighting circuit for the lamp tube is composed of a capacitor C< 1 > and an inductor L< 1 >. A voltage relay J is used for the switchover. The circuits are in voltage boosting lighting operating conditions or working operating conditions. The utility model has the advantages of small volume, light weight, material saving, low cost and steady volt-ampere characteristic. The strength of the leading phase of a power factor is easily adjusted, which can compensate for the reactive power which is desired by a user. A working current approaches to a sine wave. The utility model can prevent a higher-order harmonic from polluting an electric network. The utility model is safe and can extend the service life of the lamp tube.

Description

The capacitive compensating type gas discharge lamp ballast

The utility model belongs to the electric light source technology field, is used for gaseous discharge lamps high-power, high light efficiency such as metal halide lamp, high-pressure sodium lamp, high-pressure mercury lamp and makes current limliting stabilising arc ballast.

Metal halogen lamp is the third generation electric light source new product that the nineties China introduces, and its light efficiency height, color rendering is good, the life-span is long, power is big, and energy-saving effect is remarkable.At present it uses " the peak formula ballast in advance " is made up of leakage transformer and capacitor to limit and the gas-discharge current of stable fluorescent tube.This ballast heaviness is huge, the power loss of self reaches about 15% of lamp power, the cost height, the waveform that its important disadvantages is a source current is the shape of a saddle, and the total distortion degree reaches more than 50%, and triple-frequency harmonics content reaches more than 40%, electrical network is produced serious triple-frequency harmonics to be polluted, make three-phase alternating voltage uneven, endanger other power consumption equipments, be difficult to be accepted by electrical network because of neutral point excursion.High-pressure sodium lamp and high-pressure mercury lamp all use Inductive ballast to limit and the gas-discharge current of stable fluorescent tube at present, and its major defect is that voltage-current characteristic is very steep, and supply voltage raises, and fluorescent tube shortens lamp tube service life with serious overcurrent; Supply voltage is lower than 200V, and fluorescent tube is very easy to be flame-out, and combustion when being in, the time state that goes out, this moment, lamp current can be higher than more than 130% of rated value, can shorten the life-span of fluorescent tube quickly.The manufacturer of high-pressure sodium lamp, mercury lamp all indicated require supply voltage only allow rated value+change in 6% to-8% the scope, this is that the low-voltage power supply electrical network can't be realized.Therefore, the nominal life of high-pressure sodium lamp and mercury lamp is more than 10000 hours, and be 2000-3000 hours actual life.Another critical defect of Inductive ballast is that power factor is very low, sodium vapor lamp 0.3-0.4, and mercury lamp 0.4-0.5 will consume a large amount of reactive powers, influences the quality of voltage of low voltage electric network.Power less than 450W from ballast type high-pressure mercury lamp, its critical defect is: reduce luminous efficiency significantly, the waveform of lamp current is seriously distorted, the total distortion degree is up to more than 60%, when supply voltage was lower than 210V, the gas-discharge current of fluorescent tube was difficult to stable, and fluorescent tube very easily extinguishes.At present, announce out the patented technology of some gas discharge lamp ballasts both at home and abroad successively, because the power of all kinds of gaseous discharge lamps is all bigger, manufacturing process, production cost are all undesirable.

It is little that the purpose of this utility model provides a kind of volume, in light weight, materials are economized, voltage-current characteristic is more steady, mains voltage variations is less to the lamp current influence, the power factor height, can be electrical network and user's compensating power, and can adjust the height that circuit advances the phase power factor easily to the difference requirement of compensating power according to the user, self power loss is little, the waveform of source current is similar to sine wave, electrical network is not had high order harmonic component to be polluted, safe and reliable, cheap, can be common to metal halide lamp, high-pressure sodium lamp, the capacitive compensating type gas discharge lamp ballast of high-pressure mercury lamp.

The purpose of this utility model is achieved in that a kind of capacitive compensating type gas discharge lamp ballast, and its primary structure is by capacitor C ₁With inductance L _a, fluorescent tube D series connection, constitute operating circuit; By capacitor C ₂With inductance L ₂Series connection is again and in fluorescent tube D and inductance L _aTwo ends, constitute power factor compensation and filter circuit; By capacitor C ₁With inductance L ₁Series connection constitutes the ignition circuit that boosts to fluorescent tube; Contact J with relay J ₁And J ₂Switch, foregoing circuit is in boost and lights operating mode or work operating mode.

Because entire circuit is a capacitive, source current I ₁Preceding more in supply voltage U ₁, can provide reactive power compensation to user and electrical network; By C ₂And L ₂The circuit that constitutes can also be to source current I ₁Strobe, suppress I ₁In higher harmonic components, make waveform be similar to sine wave; And can require to adjust the height that circuit advances the phase power factor easily to the difference of compensating power according to the user, oneself power consumption is little; Simultaneously the utility model has also that volume is little, in light weight, materials are economized, and voltage-current characteristic steadily, mains voltage variations is to less, safe and reliable, the cheap characteristics of lamp current influence.

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 is a schematic diagram of the present utility model.

Among the figure 1, capacitor C ₁, 2, gaseous discharge lamp D, 3, inductance L _a, 4, voltage relay J, 5, inductance L ₁, 6, capacitor C ₂, 7, inductance L ₂, 8, leak discharge resistance R ₁, 9, bleeder resistance R ₂

Its operation principle is: when circuit rigidly connected energize, fluorescent tube was still unignited, inductance L _aLast absence of voltage, voltage relay J is failure to actuate, at this moment contact J ₁Connect J ₂Disconnect, have only C ₁And L ₁The ignition circuit that boosts that constitutes passes through electric current.Make X during design _L1＞X _C1So what flow into this circuit is inductance current, inductance L ₁On voltage drop U _L1Must be higher than supply voltage u ₁Because all kinds of gaseous discharge lamps have different requirements to keep-alive voltage, should make u when this circuit is used for Metal halogen lamp _L1=1.5 _{μ 1}When being used for high-pressure sodium lamp and mercury lamp, should make u _L1=1.2 μ l then can guarantee at source current μ ₁〉=170V time point the pipe of lighting a lamp.

After fluorescent tube D is lighted, inductance L _aOn voltage drop U is arranged _La, voltage relay J action makes contact J ₁Disconnect J ₂Connect, circuit conversion becomes operating state.This moment inductance L ₁Outage is to reduce power loss.The gas-discharge current I of fluorescent tube D _aBy capacitor C ₁Capacitive reactance X _C1With reactance X _LaLimit and stablize.Make X during design _C1＞X _LaSo entire circuit is a capacitive, source current I ₁Preceding more in supply voltage U ₁, can provide reactive power compensation to electrical network and user.

J ₂When contact is connected, capacitor C ₂And inductance L ₂The circuit of series connection promptly is connected to the two ends of fluorescent tube D and inductance L series circuit.And to the voltage U between the B of this circuit and 0 two ₈₀, lamp current I is an inductance current, I _C2Be capacity current, so I _C2Can be to I _aPlay the reactive-current compensation effect, make the electric current I of power supply input circuit ₁＜I _aSo, can improve the power factor of whole operating circuit.Simultaneously, by C ₂And L ₂The circuit that constitutes can also be to source current I ₁Strobe, suppress I ₁In higher harmonic components, make I ₁Waveform be similar to sine wave.

The gaseous discharge lamp of different places has different requirements to reactive power compensation, the high-power gas charging lamp that is used for big workshop, because of the power-equipment in the workshop many, consume reactive power is big, so require to provide as much as possible reactive power compensation, to obtain energy-saving effect preferably, this becomes capacitive low power factor type with regard to requiring with the ballast design of gaseous discharge lamp.And be used for the high-power gas charging lamp of street lamp, hall and Grand Place, because of not needing compensating power, then ballast design becomes capacitive High Power Factor type or perceptual High Power Factor type.The utility model is as long as rationally select C for use ₁And C ₂Capacitance, just can make ballast in the capacitive power factor is 0.4-0.8 scope, choose the needed numerical value of user, thereby satisfy the requirement of different user.

Because the technical performance of Metal halogen lamp, high-pressure sodium lamp and mercury lamp is widely different, and the power bracket of lamp is also very big; Promptly,, now provide the component parameters scope of all kinds of gaseous discharge lamps of 250W so the parameter of each element is selected with different power specific designs according to the kind of gaseous discharge lamp among Fig. 1 by 100W-1500W.

Capacitor C ₁15-25 μ F 500V

Capacitor C ₂5-15 μ F 500V

Inductance L _a250-100mH inductance L ₁1.5-3H

Inductance L ₂20-50mH resistance R ₁=R ₂500K

The utility model can replace the contact J of relay J with reverse-blocking tetrode thyristor ₁, J ₂

Claims (2)

1, a kind of capacitive compensating type gas discharge lamp ballast is characterized in that: by capacitor C ₁With inductance L _a, fluorescent tube D series connection, constitute operating circuit; By capacitor C ₂With inductance L ₂Series connection is again and in fluorescent tube D and inductance L _aTwo ends, constitute power factor compensation and filter circuit; By capacitor C ₁With inductance L ₁Series connection constitutes the ignition circuit that boosts to fluorescent tube; Contact J with relay J ₁And J ₂Switch, foregoing circuit is in boost and lights operating mode or work operating mode.

2, capacitive compensating type gas discharge lamp ballast according to claim 1 is characterized in that: available reverse-blocking tetrode thyristor replaces the contact J of relay J ₁And J ₂

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