CN2632985Y - High performance LC nonresonant high voltage ballast - Google Patents

Abstract

The utility model discloses an efficient LC non-resonant high tube voltage ballast, comprising an inductance, a capacitance and an electronic switch, the capacitance, the inductance are connected in series with a gas discharge lamp, the electronic switch is connected with both sides of the gas discharge lamp, a ratio of a capacitive reactance of the capacitance and an inductive reactance of the inductance is not less than 1.5. The utility model, with a good ballast effect, is suitable for the gas discharge lamp of the high tube voltage, and has a good electromagnetic compatibility, a low current total harmonic quantity, a 1.5 to 1.7 times current wave crest and no high frequency interference problems, as well as having an accurate and stationary current characteristic while steadily working, a current wave of which is less than or equal to 15 percent when a network wave is 20 percent; moreover, the system has a compatibility loading characteristic and power factor reaches 0.4 to 0.85,a direct compensation action to a mixed network and a perfect energy saving effect, and a power consumption is low to 4 to 15 percent when the utility model is in particular used for the ballasts of high power and high tube voltage gas discharge lamp; besides, the power consumption of the utility model is greatly lower than the prior product power consumption.

Description

Efficient LC disresonance type senior executive voltage ballast

Technical field

The utility model relates to the ballast that is used for gaseous discharge lamp, specifically is a kind of efficient LC disresonance type senior executive voltage ballast.

Background technology

At present, the room lighting that airport, railway station, office, school, supermarket etc. are located, and highway, avenue, square, stadium etc. are located outdoor lighting, and mainly to adopt fluorescent lamp, high-intensity gas discharge lamp (HID) be main light source.Along with the luminous efficiency of this class light source and improving constantly of color rendering index, the power of lamp is increasing, color and product variety constantly increase, people constantly deepen its dependence, this class light source is more and more important with the developing effect of civilization in the mankind's life, in the quite a long time, also do not have new light source and can replace it.

This class gas discharge class light source, because it has this physical phenomenon of negative resistance charactertistic, so the ballast components of stabilized illumination electric arc work must be arranged in its circuit, ballast has power frequency and high frequency two big classes at present, power frequency is divided resonant mode and disresonance type again, resonant mode is not generally accepted because of its unsteadiness, so do not grow up.

Disresonance type then is widely used, and most typical representative is traditional inductance type ballast, because it is simple in structure, easy to manufacture, and the reliability height, the life-span is long, and low price makes it occupy more than 80% of total consumption; But the shortcoming that this class ballast also has some to overcome, big as starting current, start-up time is long, directly influences the life-span of bulb; Power consumption is big, is only applicable to the bulb of low tube voltage, and supply voltage has certain limit with the ratio of the tube voltage of gaseous discharge lamp, otherwise the lantern festival blow-out, this point has limited to improve the feasibility that tube voltage improves luminous efficiency and energy-conservation level; Heavy Weight to the voltage ripple of power network sensitivity, obviously influences the life-span of bulb and the life-span of ballast self; Adopt parallel capacitive compensation to improve power factor, have electromagnetic compatibility problem, the total harmonic content of electric current significantly improves, and reaches more than 35%, and severe overweight pollutes public electric wire net.

Main persevering power of high frequency ballast (being wide line voltage scope type) and non-permanent power two big classes.At the electric ballast that the above-mentioned shortcoming of traditional inductance type ballast grows up, be exactly its typical representative.Its adaptability to the high tube voltage of bulb is strong, and the efficient height is energy-conservation, in light weight, and volume is less relatively, and overall dimension adaptability is strong, has especially reached more satisfactory level substantially aspect voltage ripple of power network and the raising power factor overcoming.

Its shortcoming is that reliability is low, the circuit complexity, and because of the quality problems of components and parts and the impact of electrical network etc. very easily cause damaging, price is expensive.Therefore high frequency ballast is mainly used in the small-power field at present, and the application of the high-power high-frequency ballast more than the 200W does not have to launch substantially, has restricted gaseous discharge lamp to a certain extent and has developed aspect high-power.

Summary of the invention

In view of the above-mentioned defective that prior art exists, the utility model provides a kind of efficient LC disresonance type senior executive voltage ballast, with the supporting demand of the gaseous discharge lamp that adapts to high tube voltage.

Efficient LC disresonance type senior executive voltage ballast of the present utility model comprises: inductance, electric capacity and electronic switch, described electric capacity, inductance are connected with gaseous discharge lamp, electronic switch is connected to the gaseous discharge lamp two ends, the capacitive reactance of electric capacity is not less than 1.5 with the ratio of inductance induction reactance, and both values have nothing in common with each other with the tube voltage of lamp and the variation of power and supply power voltage.When being used to connect the 28W/T5 fluorescent lamp, electric capacity is 1.3～1.9 μ F, and inductance is 1.8～2.9H.

The utility model will have the advantage of inductance type ballast and electronic ballast two big class ballasts now and compile, ballast is effective, particularly can be applicable to the gaseous discharge lamp of high tube voltage, be supply voltage and the ratio of the tube voltage of gaseous discharge lamp is 1～1.6, as in the 120V/60Hz network system, the tube voltage of gaseous discharge lamp need not to add booster circuit and gets final product steady operation below 120V.

Little to voltage ripple of power network sensitiveness, the reliability height, the life-span can reach more than 10 years.

Electro Magnetic Compatibility is good, and the total harmonic content of electric current is low, is 10～24%; Current wave crest ratio is 1.5～1.7 times; No High-frequency Interference problem; Anti-thunderbolt interference is good.

Starting current is little, is about 1.05～1.2 times of operating currents; It is fast to start and restart speed; During steady operation, have accurate constant-current characteristic, during voltage ripple of power network 20%, current fluctuation≤15%.System is the capacitive load feature, and power factor reaches 0.4～0.85, and the Combination electrical network is had the direct compensation effect, the energy-saving effect ideal, especially for the ballast of the gaseous discharge lamp of high-power and high tube voltage, it is low in energy consumption to 4～15%, is significantly less than the existing product power consumption.

Volume is less, and is in light weight, and cost is low, than electric ballast price low 30～50%.

Description of drawings

Fig. 1 is an exemplary embodiments circuit diagram of the present utility model;

Fig. 2 is another embodiment circuit diagram of the present utility model;

Fig. 3 is its polar plot:

Fig. 4 is the voltage on each components and parts in the utility model, current waveform graph of a relation.

Embodiment

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

With reference to Fig. 1,2, efficient LC disresonance type senior executive voltage ballast comprises inductance, electric capacity and electronic switch, described inductance, capacitances in series are in the ac circuit of gaseous discharge lamp, and the gaseous discharge lamp two ends are connected to electronic switch, and the capacitive reactance of electric capacity is not less than 1.5 with the ratio of inductance induction reactance.

Gaseous discharge lamp adopts warm start type fluorescent lamp among Fig. 1, and electronic switch is the electronic starter that hot cathode starts fluorescent lamp.Capacitor C, inductance L, warm start type fluorescent lamp one filament, electronic starter S and another filament of warm start type fluorescent lamp are connected successively.

Gaseous discharge lamp adopts cold start-up type fluorescent lamp or HID lamp (being high-intensity gas discharge lamp) among Fig. 2, and electronic switch is that cold cathode starts the electronic starter of fluorescent lamp and the trigger of HID lamp.Inductance L ', capacitor C ', described fluorescent lamp or the series connection of HID lamp.

When connecting cold cathode startup fluorescent lamp, electronic starter S ' is connected to the two ends that cold cathode starts fluorescent lamp.When connecting the HID lamp, the trigger S ' of HID lamp is connected to the two ends of HID lamp.

The utility model is that the gaseous discharge lamp three who utilizes inductance and electric capacity and have a negative resistance charactertistic is together in series, work characteristics in alternating current circuit, be the phase lag and the lead relationship of electric current and voltage, peculiar boosting, under non-resonant condition, the ratio that is capacitive reactance and the inductance induction reactance of electric capacity is not less than 1.5, makes the gaseous discharge lamp two ends obtain the stable voltage of keeping; Simultaneously, along with the variation of supply voltage, system impedance can be kept the less variation of system power because the impedance vector sum of inductance, electric capacity and gaseous discharge lamp (negative resistance charactertistic) is also adjusted thereupon, realizes unique ballast purpose.When electric capacity is 1.3～1.9 μ F, when inductance was 1.8～2.9H, this ballast can connect with the 28W/T5 fluorescent lamp ideally.

Fig. 3 is its polar plot: in the utility model,

Represent the impedance of desirable inductance induction reactance, electric capacity capacitive reactance and gaseous discharge lamp respectively,

Be the loop total impedance, its vector correlation is as follows:

${\stackrel{\·}{X}}_Z={\stackrel{\·}{X}}_L+{\stackrel{\·}{X}}_C+{\stackrel{\·}{X}}_D$

For actual components and parts, be revised. Represent the terminal voltage of inductance, electric capacity and gaseous discharge lamp respectively,

Represent supply power voltage.Its vector correlation is as follows:

${\stackrel{\·}{U}}_O={\stackrel{\·}{U}}_L+{\stackrel{\·}{U}}_C+{\stackrel{\·}{U}}_D$

In the real work circuit, this vector balancing relation is the condition of system held steady operation.Because With

Phase difference, just may obtain inductance and electric capacity terminal voltage separately greater than supply voltage Thereby can realize Approaching Be worth and these exclusive characteristics of steady operation, this state is that common Inductive ballast can't be worked at all.

Represent loop current, its vector correlation is as follows:

${\stackrel{\·}{I}}_D={\stackrel{\·}{U}}_O/{\stackrel{\·}{X}}_Z$

The special feature of this circuit is, when at supply voltage and bulb, chooses suitable inductance, capacitance by design, can realize one within the specific limits with Change (20-30%) and change Make

Substantially constant (＜10%) has realized the basic goal----ballast of ballast ballast basically.

Fig. 4 is the voltage on each components and parts in the utility model, current waveform graph of a relation.The phase sequence of its voltage waveform is followed successively by Simultaneously can know that the system power phase place is ahead of voltage-phase, be the capacitive load feature.In mixing electrical network, use, can compensate the power factor that improves electrical network.

Inductance L and capacitor C are by being in series with gaseous discharge lamp, all constituted the main work loop of ballast of the present utility model, it mainly acts on is to constitute an impedance loop that changes with external input voltage under non-resonant state, makes loop current keep less variation.Electronic switch S is respectively the electronic starter that hot cathode starts and cold cathode starts, the trigger of HID lamp in above-mentioned two kinds of ballasts.

The operation principle of this circuit for when power supply when operating circuit is powered, do not light at gaseous discharge lamp, the loop is not before the conducting, this moment, supply voltage all was added on the lamp two ends, just be added on the S, S is moved, and produces a high voltage pulse at the two poles of the earth of gaseous discharge lamp, gaseous discharge lamp is lighted, and gaseous discharge lamp enters operate as normal afterwards.

Be input as 220V/50HZ voltage at a power supply, load is in the example of 28W/T5 fluorescent lamp, and fluorescent tube voltage is 167V ± 17V, and lamp current is 195mA, and lamp power is 28W.Wherein the inductance that is disposed is 2.3H, and electric capacity is 1.5 μ F, and electronic switch S is special trigger.The system power dissipation of this example is 2.8W, electromagnetic compatibility EMC and FCC conformance with standard.

Claims (5)

1, a kind of efficient LC disresonance type senior executive voltage ballast, comprise inductance, it is characterized in that: also comprise an electric capacity, described electric capacity, inductance and gaseous discharge lamp three series connection, the gaseous discharge lamp two ends are connected to electronic switch, and the capacitive reactance of electric capacity is not less than 1.5 with the ratio of inductance induction reactance.

2, efficient LC disresonance type senior executive voltage ballast according to claim 1, it is characterized in that: electric capacity is 1.3～1.9 μ F, and inductance is 1.8～2.9H, is used to connect the 28W/T5 fluorescent lamp.

3, efficient LC disresonance type senior executive voltage ballast according to claim 2, it is characterized in that: electric capacity is 1.5 μ F, and inductance is 2.3H, is used to connect the 28W fluorescent lamp.

4, efficient LC disresonance type senior executive voltage ballast according to claim 1 is characterized in that: electronic switch is the electronic starter that hot cathode starts fluorescent lamp.

5, efficient LC disresonance type senior executive voltage ballast according to claim 1 is characterized in that: electronic switch is that cold cathode starts the electronic starter of fluorescent lamp and the trigger of HID lamp.

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