CN102281693A - Auto-start control circuit of gas discharge lamp tube - Google Patents
Auto-start control circuit of gas discharge lamp tube Download PDFInfo
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- CN102281693A CN102281693A CN2011101255856A CN201110125585A CN102281693A CN 102281693 A CN102281693 A CN 102281693A CN 2011101255856 A CN2011101255856 A CN 2011101255856A CN 201110125585 A CN201110125585 A CN 201110125585A CN 102281693 A CN102281693 A CN 102281693A
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- resistance
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- fluorescent tube
- filament
- discharge lamp
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Abstract
The invention discloses an auto-start control circuit of a gas discharge lamp tube. A bridge circuit formed by four resistance arms is arranged, wherein one resistance arm is connected in series with a filament of the tube so that a sum of a normal tube filament resistance value Rs and the resistance value of a resistor R4 of the resistance arm is equal to the resistance value of the other three resistance arms. One node in the bridge circuit is connected with a direct current power supply through the resistor and the corresponding node is grounded. An optically coupled circuit is connected between the other two nodes of the bridge circuit. The optically coupled circuit outputs a sampling signal and controls a ballast inverter circuit. The auto-start control circuit of the invention has low power consumption, high sensitivity and a rectifier state protection function when a service life of the tube is ended.
Description
Technical field
The present invention relates to a kind illumination electronic amperite of gas-discharge lamp, particularly a kind of control circuit of fluorescent tube self-starting.
Background technology
Electric ballast gas driving discharge lamp is under the situation of ballast power switch connection, if as pin loose contact, filament disconnect, lamp tube service life ends and failure condition such as can not activate the time, its built-in protective circuit generally all can make the inverter circuit of ballast quit work and avoid damaging ballast; When the eliminating of fluorescent tube fault, when normal fluorescent tube inserts ballast, then according to user's demand, two kinds of possibilities are arranged: a kind of is elder generation to turn-off ballast power, and energized just can be lighted fluorescent tube again; Another kind is under the condition of ballast power switch connection, as long as the fluorescent tube fault is excluded, promptly inserts the normal fluorescent tube that is suitable for again, and fluorescent tube just can be activated and light.For the picture megastore, workshop etc. are controlled the occasion of numerous fluorescent tubes by a mains switch especially, and the characteristic that the latter is referred to as the fluorescent tube self-starting in the electric ballast can seem very necessary.The fluorescent tube self-starting function has been arranged, can know immediately whether the fluorescent tube fault is got rid of by the Switching power switch.
For a long time, generally adopt a kind of filament with fluorescent tube as switch, promptly filament loop " leading to " or " breaking " way of extracting the fluorescent tube fault message realizes the self-starting of fluorescent tube.Under the fault condition that filament loop disconnects, produce a sampled signal, control ballast inverter circuit quits work; When connecting in the tube filament loop, the ballast inverter circuit no longer is subjected to the control of fault sampled signal and recovers operate as normal, thereby fluorescent tube is lighted.Adopt the ballast of this kind fluorescent tube self-starting, intact at tube filament, under the situation about lighting, ballast must have other no-load protection measure, thereby has increased cost because other faults can not be activated.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of after the condition of fixing a breakdown, and need not cut off and energized once more, can light the gaseous discharge lamp fluorescent tube self-starting control circuit that inserts normal fluorescent tube automatically.
In order to solve above technical problem, the invention provides a kind of gaseous discharge lamp fluorescent tube self-starting control circuit, a bridge circuit that is made of four resistive arms is set, the filament of one of them resistive arm serial connection fluorescent tube, make normal tube filament resistance value Rs add another resistance R 4 resistance sums of this resistive arm, equate with the resistance of other three resistive arms; A node at bridge circuit is connected with DC power supply by a resistance, the corresponding node ground connection of this node, connect an optically coupled circuit between other two nodes of bridge circuit, optically coupled circuit is output sampled signal control ballast inverter circuit when the generation of filament resistance tissue is unusual.
Described optically coupled circuit also is connected to anti-tampering capacitor C and protection diode D.
The negative pole of light-emitting diode Dg in the described optocoupler circuit is connected with the positive pole of protection diode D, prevents that too high reverse voltage from appearring in light-emitting diode Dg two ends.
Operation principle of the present invention: under the normal condition, electric bridge is a balance, and being connected among the light-emitting diode Dg of two optocoupler circuits between the bridge arm does not have direct current to flow through, and photoelectrical coupler is output signal not.When tube filament resistance increases to a certain degree, the original balance of electric bridge is broken, and the electric current that flows through among the photoelectrical coupler light-emitting diode Dg makes photoelectrical coupler output sampled signal, and the ballast inverter is quit work.When the fluorescent tube fault was got rid of, filament resistance recovered normal value, the electric bridge state that restores balance, and the ballast inverter circuit no longer includes from the fluorescent tube failure control signal of photoelectrical coupler and recovers operate as normal, and fluorescent tube is also just lighted automatically.
Superior effect of the present invention is:
(1) low-power consumption: power consumption only is the microampere magnitude;
(2) high sensitivity: change less than 8%～10% o'clock at filament resistance, control circuit can start;
(3) with rectification attitude defencive function to lamp tube life end.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
Embodiment
See also shown in the accompanying drawing, the invention will be further described.
As shown in Figure 1, the invention provides a kind of gaseous discharge lamp fluorescent tube self-starting control circuit, a bridge circuit that is made of four resistive arms is set, resistance R 1, R2, R3 constitute three independently bridge arms, resistive arm R4 connects the filament of fluorescent tube, make normal tube filament resistance value Rs add another resistance R 4 resistance sums of this resistive arm, equate with the resistance of other three resistive arms.
One end of electric bridge is that the connected node P of resistance R 1 and tube filament Rs receives dc power supply+DC through resistance R 0; The other end of electric bridge is the connected node G earthing potential of resistance R 2 and R3.The mid point of bridge arm is the light-emitting diode Dg that is connected in parallel to capacitor C, protection diode D and photoelectrical coupler U between the connected node B of the connected node A of resistance R 1 and resistance R 2 and resistance R 3 and resistance R 4.The negative pole of protection diode D and the positive pole of light-emitting diode Dg connect the A point; The negative pole of the positive pole of diode D and light-emitting diode Dg connects the B point.
Under normal circumstances, described tube filament resistance R s equates with other three resistance R 1, R2, R3 resistance value separately with the resistance value sum of described resistance R 4, electric bridge is poised state, do not have current flowing among the light-emitting diode Dg of photoelectrical coupler U, photoelectrical coupler does not have sampled signal output.In case the value of filament resistance Rs increases, surpassing a certain numerical value is infinitely great when filament disconnects, the original balance of electric bridge is broken, and the electric current that flows through among the light-emitting diode Dg of photoelectrical coupler U makes photoelectrical coupler output sampled signal, and the ballast inverter is quit work.
When the fluorescent tube fault was got rid of, filament resistance Rs recovered normal value, the electric bridge state that restores balance, and the ballast inverter circuit no longer includes from the fluorescent tube failure control signal of photoelectrical coupler U and recovers operate as normal, and the normal fluorescent tube of access is also just lighted automatically.
In order to eliminate the interference that may occur, between the A of electric bridge point and B point, i.e. the two ends shunt capacitor C of the light-emitting diode Dg of photoelectrical coupler U.
Between the A of electric bridge point and B point, be connected with protection diode D with the light-emitting diode Dg pole reversal of photoelectrical coupler U, prevent to occur too high reverse voltage at light-emitting diode Dg two ends.
Claims (3)
1. gaseous discharge lamp fluorescent tube self-starting control circuit, it is characterized in that: a bridge circuit that is made of four resistive arms is set, the filament of one of them resistive arm serial connection fluorescent tube, make normal tube filament resistance value Rs add another resistance R 4 resistance sums of this resistive arm, equate with the resistance of other three resistive arms; A node at bridge circuit is connected with DC power supply by a resistance, the corresponding node ground connection of this node, connect an optically coupled circuit between other two nodes of bridge circuit, optically coupled circuit is output sampled signal control ballast inverter circuit when the generation of filament resistance tissue is unusual.
2. gaseous discharge lamp fluorescent tube self-starting control circuit according to claim 1 is characterized in that: described optically coupled circuit also is connected to anti-tampering capacitor C and protection diode D.
3. gaseous discharge lamp fluorescent tube self-starting control circuit according to claim 2 is characterized in that: the negative pole of the light-emitting diode Dg in the described optocoupler circuit is connected with the positive pole of protection diode D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101255856A CN102281693A (en) | 2011-05-16 | 2011-05-16 | Auto-start control circuit of gas discharge lamp tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101255856A CN102281693A (en) | 2011-05-16 | 2011-05-16 | Auto-start control circuit of gas discharge lamp tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102281693A true CN102281693A (en) | 2011-12-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101255856A Pending CN102281693A (en) | 2011-05-16 | 2011-05-16 | Auto-start control circuit of gas discharge lamp tube |
Country Status (1)
| Country | Link |
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| CN (1) | CN102281693A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4572987A (en) * | 1983-03-11 | 1986-02-25 | Ab Electronic Components Limited | Lamp monitoring circuit |
| CN101009962A (en) * | 2006-01-26 | 2007-08-01 | 尼克森微电子股份有限公司 | Backlight power device of the LCD panel |
| CN101290863A (en) * | 2008-06-03 | 2008-10-22 | 扬州中兴照明股份有限公司 | Electrodeless lamp |
| CN201674717U (en) * | 2010-05-05 | 2010-12-15 | 上海阿卡得电子有限公司 | Segmented light adjustment double-tube electronic ballast |
| CN202218469U (en) * | 2011-05-16 | 2012-05-09 | 上海阿卡得电子有限公司 | Self-starting control circuit for gas discharge lamp tube |
-
2011
- 2011-05-16 CN CN2011101255856A patent/CN102281693A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4572987A (en) * | 1983-03-11 | 1986-02-25 | Ab Electronic Components Limited | Lamp monitoring circuit |
| CN101009962A (en) * | 2006-01-26 | 2007-08-01 | 尼克森微电子股份有限公司 | Backlight power device of the LCD panel |
| CN101290863A (en) * | 2008-06-03 | 2008-10-22 | 扬州中兴照明股份有限公司 | Electrodeless lamp |
| CN201674717U (en) * | 2010-05-05 | 2010-12-15 | 上海阿卡得电子有限公司 | Segmented light adjustment double-tube electronic ballast |
| CN202218469U (en) * | 2011-05-16 | 2012-05-09 | 上海阿卡得电子有限公司 | Self-starting control circuit for gas discharge lamp tube |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111214 |