CN101848586A - Arc suppressing circuit of electronic ballast output end - Google Patents
Arc suppressing circuit of electronic ballast output end Download PDFInfo
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- CN101848586A CN101848586A CN 201010208634 CN201010208634A CN101848586A CN 101848586 A CN101848586 A CN 101848586A CN 201010208634 CN201010208634 CN 201010208634 CN 201010208634 A CN201010208634 A CN 201010208634A CN 101848586 A CN101848586 A CN 101848586A
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- transformer
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- secondary winding
- electronic ballast
- output end
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- 238000004804 winding Methods 0.000 claims abstract description 37
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 20
- 239000010703 silicon Substances 0.000 claims abstract description 20
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 238000010079 rubber tapping Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 abstract 1
- 238000010891 electric arc Methods 0.000 description 13
- 101150117895 LAMP2 gene Proteins 0.000 description 2
- 101150048357 Lamp1 gene Proteins 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The invention discloses an arc suppressing circuit of an electronic ballast output end. A secondary winding of a current resonance output transformer T is connected with two windings n2 and n3 in series and is used for supplying output voltage for parallel tubes, a tapping point of the winding n3 is connected with a silicon-controlled switch in series, the silicon-controlled switch is connected with the tubes and is triggered by a sampling and triggering circuit to communicate or stop. After the silicon-controlled switch is communicated, the secondary winding n3 of the transformer T is in a short circuit. The electronic ballast has excellent low-temperature starting performance and can reduce and maintain output voltage output from a secondary booster coil of the transformer on a level which is insufficient to generate arc charging for causing safety accidents after the tubes are firstly ignited and started.
Description
Technical field
The present invention relates to a kind of illumination electronic amperite of gas-discharge lamp, particularly a kind of arc suppressing circuit of electronic ballast output end.
Background technology
By the characteristic of gaseous discharge lamp, before lamp activating is lighted, must there be a high activation voltage just can light fluorescent tube.Connect at electronic amperite of gas-discharge lamp on the output of fluorescent tube and have high voltage, in case the situation of luminous tube pin loose contact takes place, the phenomenon of arc discharge just may occur when in use.If arc discharge is constant, will stay hidden danger for initiation fire etc.For this reason, relevant safety standard has strict requirement to the arc discharge degree of electronic ballast output end.
According to the topological structure of electric ballast resonant tank, can be divided into the electric ballast of series resonance and the electric ballast of parallel resonance.When the output loose contact, although two kinds of resonant circuit structures all arc phenomenon may occur, the order of severity can be variant.
The small power electric sub-ballast of series resonance when the luminous tube pin loose contact, tangible arc discharge can not occur; And the series resonance electric ballast of high-power type when the fluorescent tube loose contact, also might produce bigger arc discharge.
The electric ballast of parallel resonance takes transformer to boost usually, again by electric capacity or current limit by inductance.In entire work process, there is very high voltage all the time in the secondary step-up coil of transformer.Can normally start fluorescent tube in order to keep ballast when the low-temperature condition, requirement may be up to the output voltage more than the 500Vac before fluorescent tube was lighted.High ballast output voltage like this, when the fluorescent tube loose contact, continual high-voltage arc electric current will become potential safety hazard.
For the electric ballast of parallel resonance, adopt usually after detecting the arc discharge signal, to make the out-of-work way of ballast avoid continuing to take place electric arc.Though make the electric ballast failure of oscillation can solve the electric arc problem, in case failure of oscillation then must restart switch and just can make electric ballast recover operate as normal.
In the electric ballast of series resonance, the way of the above-mentioned arc discharge of existing solution is, by detection line, after detecting arc signal, resonance frequency improved, and output end voltage reduces, thereby restriction output energy avoids taking place serious arc phenomenon.But this type of circuit need be equipped with the tricks of protection circuit according to the quantity of fluorescent tube at present, and fluorescent tube of every increase just must increase by a cover protection circuit, and therefore, along with the increase of fluorescent tube quantity, cost can be higher relatively.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of ballast that makes to have excellent cold-starting characteristic, and can be after fluorescent tube be lighted startup for the first time, reduce the output voltage of the secondary step-up coil of output transformer, and output voltage is maintained be not enough to the arc suppressing circuit of electronic ballast output end on the level that produces the arc discharge that can cause security incident.
In order to solve above technical problem, the invention provides a kind of arc suppressing circuit of electronic ballast output end, at the secondary winding of parallel resonance output transformer T, be serially connected with two windings of n2, n3, this winding provides output voltage to the fluorescent tube of parallel connection; Wherein be connected in series a reverse-blocking tetrode thyristor at the tapping point of winding n3 and be connected with fluorescent tube, controllable silicon is subjected to the sampling trigger circuit triggering and conducting or ends, and after the controllable silicon conducting, makes the secondary winding n3 short circuit of transformer T.
Described sampling trigger circuit is that the tapping point at the secondary winding n3 of transformer T is serially connected with divider resistance R1, R2, rectifier diode D, charging resistor R3, integrating capacitor C4 and resistance R 4, electric current after the rectifier diode D rectification charges to integrating capacitor C4 through charging resistor R3, and be connected with the SCR control utmost point by bidirectional trigger diode DA, between the SCR control utmost point and the negative electrode and be connected to anti-interference capacitor C5, resistance R 5.
The value of the charging resistor R3 of described sampling trigger circuit, integrating capacitor C4, resistance R 4 is according to the decision of lamp lighting-up time, promptly behind the lamp lighting-up, makes reverse-blocking tetrode thyristor connect short circuit transformer T secondary winding n3 immediately.
During the initial work of electric ballast, two secondary winding n2 that are connected in series and the n3 of output boostering transformer T provide output voltage for fluorescent tube Lamp jointly.This voltage is to determine by the required starting resistor of fluorescent tube under any set point of temperature condition.The voltage that voltage on the secondary winding n3 of output boostering transformer T is got on resitstance voltage divider R1 and R2 through current limiting capacitance C3 is through diode D rectification, charge to capacitor C 4 by R3, when arriving the trigger voltage of diac DA and controllable silicon SCR after the time delay that the voltage on resistance R 4 that is connected in parallel and capacitor C 4 is determined via the value of related resistors, electric capacity, the controllable silicon SCR triggering and conducting, with the secondary winding n3 ac short circuit of output boostering transformer T, the output voltage of electric ballast is reduced to the secondary voltage on n2 of output transformer T.Ballast output end will maintain on this lower output-voltage levels all the time, until ballast next time starting up again.Like this, have only in the blink after ballast is started shooting, exist on the output of ballast to activate and light the necessary high voltage of fluorescent tube, afterwards, even situations such as luminous tube pin loose contact take place, on ballast output end, reduced voltage level will be not enough to cause lasting, hinder safe, high-octane arc discharge.
Effectively eliminate various interference in the circuit by R5 and C5 resistance-capacitance network between controllable silicon SCR control utmost point G and the negative electrode K, make circuit be stablized, work reliably.
Superior effect of the present invention is:
1) compared with prior art, has and use a cover protective circuit to control the advantage of a plurality of fluorescent tubes, and behind product protection, do not need to restart power supply, only can recover the normal operating conditions of electric ballast and fluorescent tube in the mode that inserts fluorescent tube again;
2) make ballast have excellent cold-starting characteristic, and can be after fluorescent tube is lighted startup for the first time, reduce and the output voltage of keeping the secondary step-up coil of output transformer is being not enough to produce on the level of the arc discharge that can cause security incident;
3) cost is low.
Description of drawings
Fig. 1 is arc suppressing circuit of electronic ballast output end figure of the present invention;
The number in the figure explanation
T-ballast output boostering transformer; R1, R2-divider resistance;
The elementary winding of n1-output boostering transformer; The R3-charging resistor;
N2, the elementary winding of n3-output boostering transformer; The R4-integrating resistor;
C1, C2-output current limiting electric capacity; The anti-interference resistance of R5-;
The C3-current limiting capacitance; The D-rectifier diode;
The C4-integrating capacitor; The DA-bidirectional trigger diode;
The C5-anti-interference capacitor; The SCR-controllable silicon;
Lamp1,2-gaseous discharge lamp.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
The invention provides a kind of arc suppressing circuit of electronic ballast output end, at the secondary winding of parallel resonance output transformer T, be serially connected with two windings of n2, n3, this winding provides output voltage to the fluorescent tube of parallel connection; Wherein be connected in series a reverse-blocking tetrode thyristor at the tapping point of winding n3 and be connected with fluorescent tube, controllable silicon is subjected to the sampling trigger circuit triggering and conducting or ends, and after the controllable silicon conducting, makes the secondary winding n3 short circuit of transformer T.
Described sampling trigger circuit is that the tapping point at the secondary winding n3 of transformer T is serially connected with divider resistance R1, R2, rectifier diode D, charging resistor R3, integrating capacitor C4 and resistance R 4, electric current after the rectifier diode D rectification charges to integrating capacitor C4 through charging resistor R3, and be connected with the SCR control utmost point by bidirectional trigger diode DA, between the SCR control utmost point and the negative electrode and be connected to anti-interference capacitor C5, resistance R 5.
The value of the charging resistor R3 of described sampling trigger circuit, integrating capacitor C4, resistance R 4 is according to the decision of lamp lighting-up time, promptly behind the lamp lighting-up, makes reverse-blocking tetrode thyristor connect short circuit transformer T secondary winding n3 immediately.
Two secondary winding of described step-up transformer T, the n3 of the n2 of pin 3 and pin 4 and pin 4 and pin 5 is connected in series.The pin 3 of described secondary winding n2 provides starting voltage through described fluorescent tube current-limiting capacitor C 1 and C2 to fluorescent tube Lamp1 and Lamp2.The pin 5 of secondary winding n3 joins at a point through the common port of described current limiting capacitance C3 and fluorescent tube Lamp1 and fluorescent tube Lamp2.Two secondary pins 4 around n2 and n3 at described step-up transformer T are to be connected in parallel to divider resistance and R1 and R2 and controllable silicon SCR between common point b and the output point a.The anode A of controllable silicon SCR and negative electrode K connect b point and a point respectively, be connected anti-interference resistance R 5 and capacitor C 5 between the control utmost point G of controllable silicon SCR and the negative electrode K, the control utmost point G of controllable silicon SCR receives by bidirectional trigger diode DA on the integrating capacitor C4 and resistance R 4 that is connected in parallel, and this tie point also joins with the end of charging resistor R3.The other end of charging resistor R3 is received on the common point of divider resistance R1 and R2 through rectifier diode D.The integrating capacitor C4 that is connected in parallel and resistance R 4 other ends are the negative electrode K that are connected on controllable silicon SCR, promptly on the output point a.
When electric ballast startup work, controllable silicon SCR is not worked, and two the secondary winding n2 that are connected in series of described step-up transformer T and n3 start and normal working voltage for fluorescent tube provides to light jointly.No matter fluorescent tube is to change normal operating conditions over to after lighting, or the fluorescent tube under luminous tube pin loose contact condition is started repeatedly to be lighted, at the of short duration time delays of process, after the described controllable silicon SCR triggering and conducting, the secondary winding n3 of described step-up transformer T is by ac short circuit, have only a secondary winding n2 that output voltage is provided, the voltage of two secondary winding of the described output boostering transformer of reasonable distribution, can accomplish when ballast is connected startup work, exporting one is enough under any temperature conditions normal fluorescent tube and lights required startup high voltage, and one section of short duration time-delay after starting, even the situation of pin loose contact occurs, output voltage all will be reduced to and be not enough to cause the level with enough energy electric arc discharges.
Claims (3)
1. arc suppressing circuit of electronic ballast output end is characterized in that:
At the secondary winding of parallel resonance output transformer T, be serially connected with two windings of n2, n3, this winding provides output voltage to the fluorescent tube of parallel connection; Wherein be connected in series a reverse-blocking tetrode thyristor at the tapping point of winding n3 and be connected with fluorescent tube, controllable silicon is subjected to the sampling trigger circuit triggering and conducting or ends, and after the controllable silicon conducting, makes the secondary winding n3 short circuit of transformer T.
2. by the described arc suppressing circuit of electronic ballast output end of claim 1, it is characterized in that:
Described sampling trigger circuit is that the tapping point at the secondary winding n3 of transformer T is serially connected with divider resistance R1, R2, rectifier diode D, charging resistor R3, integrating capacitor C4 and resistance R 4, electric current after the rectifier diode D rectification charges to integrating capacitor C4 through charging resistor R3, and be connected with the SCR control utmost point by bidirectional trigger diode DA, between the SCR control utmost point and the negative electrode and be connected to anti-interference capacitor C5, resistance R 5.
3. by the described arc suppressing circuit of electronic ballast output end of claim 2, it is characterized in that:
The value of the charging resistor R3 of described sampling trigger circuit, integrating capacitor C4, resistance R 4 is according to the decision of lamp lighting-up time, promptly behind the lamp lighting-up, makes reverse-blocking tetrode thyristor connect short circuit transformer T secondary winding n3 immediately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010208634 CN101848586B (en) | 2010-06-24 | 2010-06-24 | Arc suppressing circuit of electronic ballast output end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010208634 CN101848586B (en) | 2010-06-24 | 2010-06-24 | Arc suppressing circuit of electronic ballast output end |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101848586A true CN101848586A (en) | 2010-09-29 |
| CN101848586B CN101848586B (en) | 2013-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010208634 Active CN101848586B (en) | 2010-06-24 | 2010-06-24 | Arc suppressing circuit of electronic ballast output end |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6008587A (en) * | 1996-02-29 | 1999-12-28 | Mills; Robert | Fluorescent lamp electronic ballast control circuit |
| CN101754551A (en) * | 2010-02-04 | 2010-06-23 | 上海阿卡得电子有限公司 | Fluorescent lamp abnormal condition protection and sampling circuit |
| CN201718106U (en) * | 2010-06-24 | 2011-01-19 | 上海阿卡得电子有限公司 | Arc suppression circuit at output end of electronic ballast |
-
2010
- 2010-06-24 CN CN 201010208634 patent/CN101848586B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6008587A (en) * | 1996-02-29 | 1999-12-28 | Mills; Robert | Fluorescent lamp electronic ballast control circuit |
| CN101754551A (en) * | 2010-02-04 | 2010-06-23 | 上海阿卡得电子有限公司 | Fluorescent lamp abnormal condition protection and sampling circuit |
| CN201718106U (en) * | 2010-06-24 | 2011-01-19 | 上海阿卡得电子有限公司 | Arc suppression circuit at output end of electronic ballast |
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| Publication number | Publication date |
|---|---|
| CN101848586B (en) | 2013-09-18 |
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