CN100515156C - Soft starting electronic ballast - Google Patents
Soft starting electronic ballast Download PDFInfo
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- CN100515156C CN100515156C CNB2004100664028A CN200410066402A CN100515156C CN 100515156 C CN100515156 C CN 100515156C CN B2004100664028 A CNB2004100664028 A CN B2004100664028A CN 200410066402 A CN200410066402 A CN 200410066402A CN 100515156 C CN100515156 C CN 100515156C
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Abstract
A soft starting electronic ballast, which contains power input circuit, dc/ac inverter, control circuit, lamp output part, self exciting half-bridge series resonance circuit, current negative feedback circuit composed of transistor, diode and feedback current limiting resistor, differential circuit composed of differential capacitor and resistor for obtaining constant filament preheating current and lamp tube preheating voltage. In said invention, the sharp increased switch tube current is limited in safety range without the overcurrent protection circuit in current technology.
Description
[technical field]
The present invention relates to the relevant electronic ballast for fluoresent lamp technology of a kind of electrical lighting engineering and use particularly a kind of electric ballast with soft start function.
[background technology]
Because the light efficiency of fluorescent lamp approximately is five times of incandescent lamp, the life-span is three times of incandescent lamp approximately, and the heat that is sent is more much lower than incandescent lamp, is just becoming the main illumination light source in present office and the life staying idle at home.And the heart component-electric ballast of fluorescent lamp has remarkable energy saving effect and advantages such as no stroboscopic, low noise because of it, has also become the major product that replaces traditional ballast.In order to improve the reliability of electric ballast, prolonging lamp tube useful life, each manufacturer technology of all sparing no effort to carry out is inquired into and is upgraded.Its major technique is summed up nothing more than having following several: the technology of using PTC and abnormal protection circuit; The technology of using IC to drive; And employing CUT-OFF technology etc.
Using the technology of PTC and abnormal protection circuit is a kind of semistor (PTC) by being connected in lamp tube ends in parallel, realizes the preheating of warm-up phase to filament.Generally it is made up of auto-excitation type positive feedback half-bridge circuit; Occur when unusual at fluorescent tube, need the abnormal protection circuit finish positive feedback by work, finally realize the half-bridge circuit failure of oscillations and be output as zero.This electric ballast that uses the PTC technology, its pre-heat effect can be subjected to the influence of ambient temperature, and simultaneously, therefore the efficient of ballast and reliability also can reduce.Additional abnormity protection circuit makes its cost be difficult to reduce.
The IC Driving technique is to provide a higher frequency of oscillation at warm-up phase, makes filament pre-heating; After preheating was finished, it provided lower frequency of oscillation again, makes lamp tube starting.And, utilize the limited guard signal input of IC to bring in and finish abnormal protection.Though this IC Driving technique adopts the frequency conversion mode to carry out preheating in application, its cost is higher, and circuit is also complicated, and reliability also decreases.
Adopt the electric ballast of CUT-OFF technology, adopt half-bridge parallel resonance formula circuit usually or recommend parallel resonance formula circuit.This technology utilization control bidirectional triode thyristor (TRIAC) provides filament pre-heating voltage between warming up period, reduce after preheating finishes or turn-offs filament voltage, improves pre-heat effect and the loss of reduction filament with this.Though this CUT-OFF technology can provide comparatively ideal pre-heat effect, because it is the parallel resonance spacing output circuit, overall efficiency is difficult to reach more than 90%.
[summary of the invention]
The technology of the present invention is to be solved be overcome in the prior art since non-constant current filament pre-heating and the pre-thermal voltage of non-constant voltage fluorescent tube to injury that fluorescent tube brought; reach the defectives such as cost increase that the privacy protection circuit brings; by in traditional semi-bridge autonomous AC/DC translation circuit (DC/AC), adopting a kind of soft Starting Technology, reduce cost, improve the purpose in electric ballast reliability and prolonging lamp tube useful life to reach.
The present invention has adopted following technical proposal to solve its technical problem: a kind of soft starting electronic ballast, comprise power supply input circuit, DC/AC inverter, control circuit and lamp output, it is characterized in that: adjunction one current negative feedback circuit and a differential circuit respectively in the upper and lower bridge arm circuit of the auto-excitation type half bridge series resonance circuit of this DC/AC inverter.
Current negative feedback circuit among the present invention, in order to realize constant filament pre-heating electric current and constant preheat lamp tube voltage, to guarantee that need not extra light tube electric voltage under fully constant filament pre-heating condition just can light fluorescent tube, is not having to reach desirable pipeline start up by preheating equally under the situation of PTC.And, when under the abnormality of non-activation fluorescent tube, being limited in the safe range, thereby saved circuit overcurrent protection of the prior art owing to the degenerative effect of dynamic current makes the switching tube electric current that originally sharply increases.Differential circuit among the present invention is in order to improve the switching characteristic of switching tube Q1 and Q2.
Patent of the present invention has solved the defective of non-constant current preheating in current commercial PTC preheating technology and the IC preheating technology; need problems such as extra high pressure when higher cost that indispensable protective circuit is brought and startup; thereby reduced product cost technically; improve reliability, prolonged lamp tube service life.
[description of drawings]
Fig. 1 is an electronic ballast components block diagram of the present invention;
Fig. 2 is a prior art DC/AC inverter circuit;
Fig. 3 is an electrical schematic diagram of the present invention;
Fig. 4 is light tube electric voltage, the current waveform figure of pipeline start up by preheating in the prior art;
Fig. 5 is filament voltage, the current waveform figure of pipeline start up by preheating in the prior art;
Fig. 6 is light tube electric voltage, the current waveform figure of pipeline start up by preheating in the technology of the present invention;
Fig. 7 is filament voltage, the current waveform figure of pipeline start up by preheating in the technology of the present invention.
Each sequence number is expressed as respectively among the figure:
The C differential capacitance
The D clamping diode
The Q transistor
R negative feedback current-limiting resistance
R1, the R2 negative feedback resistor
D1, D2 half-bridge fly-wheel diode
T1A, T1B, T1C positive feedback oscillator coil
Rb1, Rb2 positive feedback current-limiting resistance
Rdiac, Cdiac, DIAC, Dc Schmitt trigger element
The L resonant inductance
The C1 capacitance
The C2 resonant capacitance
Q1, Q2 half-bridge switch pipe
The Lamp fluorescent tube
1,2 Current Negative Three-Point Capacitance and differential circuit
[embodiment]
The invention will be further described below in conjunction with embodiment and accompanying drawing.
With reference to Fig. 1, electric ballast is usually by the power supply input circuit part, AC/DC (DC/AC) converter, and control circuit and lamp output are formed.The power supply input circuit part earlier through in order to eliminate the filter that high-frequency electromagnetic disturbs (EMI), becomes direct current output through rectification circuit and filter circuit usually again, and what have also is provided with passive or APFC.DC/AC inverter (DC/AC) will convert high-frequency ac voltage from the direct voltage of power supply input circuit to drive fluorescent tube Lamp.Control circuit is that the protective circuit that requires to be adopted according to Design of Driving System is to improve the reliability of system.
With reference to Fig. 2, Fig. 3, the present invention includes power supply input circuit (not drawing among Fig. 3), DC/AC inverter, control circuit and lamp output among Fig. 1, adjunction one Current Negative Three-Point Capacitance and differential circuit 1,2 respectively in the upper and lower bridge arm circuit of the auto-excitation type half bridge series resonance circuit of this DC/AC inverter.
With reference to Fig. 3,, below serve as main the elaboration only with a current negative feedback circuit because the basic structure of current negative feedback circuit of the present invention in the upper and lower bridge arm circuit of auto-excitation type half bridge series resonance circuit is identical.Current negative feedback circuit of the present invention comprises a transistor Q; One clamping diode D; And a negative feedback resistor R1 (or R2) and a negative feedback current-limiting resistance R, between the base stage of transistor Q and the emitter and meet a clamping diode D, after being connected in series, negative feedback resistor R1 (or R2) and negative feedback current-limiting resistance R be attempted by base stage and the emitter two ends of transistor Q in this circuit.
Differential circuit of the present invention is connected in series by a differential capacitance C and negative feedback current-limiting resistance R and negative feedback resistor R1 (or R2) and forms.
In current negative feedback circuit, its transistor Q base stage is connected with the collector electrode of half-bridge switch pipe Q1 (or Q2) in the half bridge series resonance circuit by serial connection one differential capacitance C; The collector electrode of transistor Q is connected with the base stage of half-bridge switch pipe Q1 (or Q2) in the half bridge series resonance circuit; Feedback current-limiting resistance R is connected with the emitter of half-bridge switch pipe Q1 (or Q2) with negative feedback resistor R1 (or R2) mid point link; The emitter of transistor Q connects lower end a, the b point of the upper and lower half-bridge brachium pontis in the half bridge series resonance circuit respectively.
Its operation principle underdraws as follows:
When power connection moment, under the differential circuit effect that differential capacitance C, feedback current-limiting resistance R, negative feedback resistor R1 (or R2) form, the instantaneous conducting of transistor Q makes switching tube Q1 and Q2 all be in cut-off state, thereby reduced power connection moment rush of current to switching tube.Along with the charging of differential capacitance C in the differential circuit, until entering desirable periodicity differential state, thereby improved the switching characteristic of switching tube Q1 and Q2.Meanwhile, under the effect of current negative feedback circuit, make the electric current and the light tube electric voltage that flow through fluorescent tube Lamp filament be tending towards constant, and enter preheat mode.When filament during by abundant preheating, fluorescent tube Lamp need not natural starter under the extra high-tension condition.At this moment, circuit has entered normal operating conditions.
When power connection moment, when fluorescent tube is unactivated state, electric current I c can sharply increase, but under the effect of current negative feedback circuit, because the voltage on negative feedback resistor R1 and the negative feedback resistor R2 is because of the increase of electric current I c and by feeding back the base stage that current-limiting resistance R feeds back to transistor Q respectively, a part of drive current of driving switch pipe Q1 and Q2 is shunted by transistor Q, thereby the electric current I c of switching tube Q1 and Q2 is controlled in the safe range.
In when, after fluorescent tube operate as normal a period of time gas leakage taking place when, electric current I c also can sharply increase, but under the effect of current negative feedback circuit, because the voltage on negative feedback resistor R1 and the negative feedback resistor R2 is because of the increase of electric current I c and by feeding back the base stage that current-limiting resistance R feeds back to transistor Q respectively, a part of drive current of driving switch pipe Q1 and Q2 is shunted by transistor Q, thereby the electric current I c of switching tube Q1 and Q2 is controlled in the safe range.
For the characteristics of the technology of the present invention are described, below remake further analysis with oscillogram:
Fig. 4, Fig. 5 are to use the pipeline start up by preheating oscillogram of the prior art of PTC and abnormal protection circuit, and it is to adopt in lamp tube ends and connect a semistor (PTC) to realize filament pre-heating.Between warming up period, the voltage of filament voltage, heater current and lamp tube ends all has from the big trend of little change, and particularly in the moment of lamp tube starting, these parameters all reach maximum.Therefore, inevitably can cause injury to Filament of fluorescent lamp and fluorescent tube.It also is like this adopting the situation of IC Driving technique.
Fig. 6, Fig. 7 are the pipeline start up by preheating oscillograms of soft Starting Technology of the present invention.Between warming up period, give the constant preheat curent of filament, apply a constant voltage that is lower than cold starting voltage in lamp tube ends.This constant preheat curent has been avoided the impact to Filament of fluorescent lamp; And be applied to the constant voltage of lamp tube ends, and be lower than on the cold starting voltage value owing to be set at one, not only avoided impact, and guaranteed that the glow current value is less than the 25mA of standard code between warming up period fluorescent tube.Particularly this soft Starting Technology is to light naturally behind the abundant waste heat of fluorescent tube, does not have extra startup high voltage of the prior art, thereby greatly reduces the requirement of withstand voltage to related device.
In sum, because the present invention is by having increased a pair of soft starting circuit on prior art (Fig. 2) basis, realized the filament constant current of fluorescent tube, the soft start new ideas of fluorescent tube constant voltage, having reduced cost technically, improve reliability, prolonged lamp tube service life.Startup new ideas of the present invention make the startup of fluorescent tube become humanized, promptly when people when the environment of light dark is opened lamp power, a kind ofly give comfortable sensation by the dark gradually bright process of lighting a lamp, the health of human eye is played the certain protection effect.
Claims (1)
1, a kind of soft starting electronic ballast, comprise power supply input circuit, DC/AC inverter, control circuit and lamp output, it is characterized in that: adjunction one current negative feedback circuit respectively in the upper and lower bridge arm circuit of the auto-excitation type half bridge series resonance circuit of this DC/AC inverter, an and differential circuit
Described current negative feedback circuit comprises a transistor; One clamping diode; And a negative feedback resistor and a negative feedback current-limiting resistance, between the base stage of transistor and the emitter and connect a clamping diode, after being connected in series, negative feedback resistor and negative feedback current-limiting resistance be attempted by the base stage and the emitter two ends of transistor in this circuit,
Described differential circuit is connected in series by a differential capacitance and negative feedback current-limiting resistance and negative feedback resistor and forms,
Described current negative feedback circuit, its transistor base stage is connected with the collector electrode of half-bridge switch pipe in the half bridge series resonance circuit by being connected in series a differential capacitance; The collector electrode of transistor is connected with the base stage of half-bridge switch pipe in the half bridge series resonance circuit; The negative feedback current-limiting resistance is connected with the emitter of half-bridge switch pipe with negative feedback resistor mid point link; The emitter of transistor connects the lower end of the upper and lower half-bridge brachium pontis in the half bridge series resonance circuit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100664028A CN100515156C (en) | 2004-09-15 | 2004-09-15 | Soft starting electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100664028A CN100515156C (en) | 2004-09-15 | 2004-09-15 | Soft starting electronic ballast |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1750730A CN1750730A (en) | 2006-03-22 |
| CN100515156C true CN100515156C (en) | 2009-07-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100664028A Expired - Fee Related CN100515156C (en) | 2004-09-15 | 2004-09-15 | Soft starting electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100515156C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100423439C (en) * | 2006-07-19 | 2008-10-01 | 陈玉明 | Power field effect tube exciting circuit |
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2004
- 2004-09-15 CN CNB2004100664028A patent/CN100515156C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1750730A (en) | 2006-03-22 |
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Owner name: PHIHONG ELECTRONICS (SUZHOU) CO., LTD. Free format text: FORMER OWNER: PHIHONG ELECTRONICS (SHANGHAI) CO., LTD. Effective date: 20080822 |
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Effective date of registration: 20080822 Address after: Shanghai Gumei Road No. 1515 Building No. 17 Building 1 post encoding: 200023 Applicant after: Feihong Electronic (Suzhou) Co., Ltd. Address before: Shanghai City, Ruijin Road 1 road Haixing Plaza 31, post encoding: 200023 Applicant before: Feihong Electronic (Shanghai) Co., Ltd. |
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