CN105050303A - Direct-current fluorescent lamp tube circuit with protective function - Google Patents
Direct-current fluorescent lamp tube circuit with protective function Download PDFInfo
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- CN105050303A CN105050303A CN201510575788.3A CN201510575788A CN105050303A CN 105050303 A CN105050303 A CN 105050303A CN 201510575788 A CN201510575788 A CN 201510575788A CN 105050303 A CN105050303 A CN 105050303A
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Abstract
The invention relates to a direct-current fluorescent lamp tube circuit with a protective function and belongs to the fluorescent lamp direct-current power source circuit technical field. One end of a ceramic capacitor is connected with a driving chip; the other end of the ceramic capacitor is connected with a grounding end; the driving chip can be connected with one end of a variable resistor 2; the other end of the variable resistor 2 is connected with the collector of a triode 2; the emitter of the triode 2 is connected with one end of a variable resistor 1 and a grounding end; the other end of the variable resistor 1 is connected with one end of the variable resistor 2; the base of the triode 2 is connected with one end of a biasing resistor; the other end of the biasing resistor is connected with the negative pole of a diode and one end of a capacitor; the other end of the capacitor is connected with a grounding end; and the positive pole of a diode 1 is connected with an electronic control end and the collector of a triode 1 respectively. According to the direct-current fluorescent tube circuit, an electrode protection preheating process in a starting stage is utilized, and therefore, in the starting stage of a lamp tube, a lamp filament can be protected, and the service life of the lamp filament can be prolonged.
Description
Technical field
The present invention relates to fluorescent lamp direct-flow power circuit technical field, be specifically related to a kind of direct current fluorescent tube circuit with defencive function.
Background technology
The electronic ignition circuit of fluorescent tube mostly is the pre-thermal high glow starting function of time delay usually, in the occasion of some bad environments, the life-span of fluorescent tube can shorten greatly, this is more obvious in present agricultural trapping lamp industry, the startup of fluorescent tube is required there is a great difference with general indoor use, although the lot of domestic and international manufacturer multiple start-up circuit of own development and bootrom, but be all start for the fluorescent tube under civil power environment, the DC power supply type light fixture of the solar powered type of current agricultural use is not related to.
Summary of the invention
The object of the invention is to the defect for prior art and deficiency; the direct current fluorescent tube circuit with defencive function that a kind of structure is simple, reasonable in design, easy to use is provided; utilize startup stage electrode protection warm, play the protection of filament and the function of life startup stage of fluorescent tube.
For achieving the above object, the technical solution used in the present invention is: it comprises power supply, resistance, switch, triode three, triode four, diode two, diode three, transformer, inductance, capacitance, fluorescent tube, resonant capacitance, ceramic condenser, one end of power supply respectively with resistance, one end of switch connects, the other end of switch is connected with 2 pin of transformer, 1 pin of transformer respectively with the negative pole of diode two, the collector electrode of triode three connects, the emitter of triode three is connected with the positive pole of diode two and earth terminal respectively, 3 pin of transformer respectively with the negative pole of diode three, the collector electrode of triode four connects, the emitter of triode four is connected with the positive pole of diode three and earth terminal respectively, 4 pin of transformer are connected with one end of inductance, the other end of inductance is connected with one end of fluorescent tube, the other end of fluorescent tube is connected with one end of capacitance, the other end of capacitance is connected with 5 pin of transformer, and the outside of fluorescent tube is parallel with resonant capacitance, it also comprises driving chip, triode one, triode two, diode one, biasing resistor, variable resistor one, variable resistor two, electric capacity, the base stage of described triode three, the base stage of triode four are all connected with driving chip, one end of described ceramic condenser is connected with driving chip, the other end of ceramic condenser is connected with earth terminal, driving chip is connected with one end of variable resistor two, the other end of variable resistor two is connected with the collector electrode of triode two, the emitter of triode two is connected with one end of variable resistor one and earth terminal respectively, the other end of variable resistor one is connected with one end of variable resistor two, the base stage of triode two is connected with one end of biasing resistor, the other end of biasing resistor is connected with the negative pole of diode and one end of electric capacity respectively, the other end of electric capacity is connected with earth terminal, the positive pole of diode one is connected with the collector electrode of Electronic Control end and triode one respectively, the other end of described resistance is connected with the collector electrode of triode one, and the emitter of triode one is connected with earth terminal, and the base stage of triode one is connected with control signal.
Operation principle of the present invention: fluorescent tube start before, control signal is low level, and triode one ends, controlled switch disconnect, driving chip not electric work, now supply voltage is via resistance, diode a pair capacitor charging.Because time constant is very short, can think fluorescent tube start before moment, the voltage on electric capacity oneself be charged to steady-state value, for start fluorescent tube time filament pre-heating prepare.
Start-up course of the present invention: triode one is full conjunction state when control signal transfers high level to, and switch closes, makes driving chip and triode three and triode four obtain electric work.Driving chip produces the two-phase square wave that a pair duty ratio is about less than 50%, after triode three, triode four amplification and transformer boost, the excitation square wave of peak-to-peak value about 250V is obtained at transformer secondary output, add to the fluorescent tube loop be made up of capacitance, inductance, resonant capacitance and fluorescent tube, the resonance frequency in loop is:
After adopting said structure; beneficial effect of the present invention is: a kind of direct current fluorescent tube circuit with defencive function of the present invention; utilize startup stage electrode protection warm; play the protection of filament and the function of life startup stage of fluorescent tube, and have structure simple, arrange rationally, the advantage such as cost of manufacture is low.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Shown in Fig. 1, the technical scheme that this embodiment adopts is: it comprises power Vcc, resistance R, K switch, triode three Q3, triode four Q4, diode two D2, diode three D3, transformer T, inductance L, capacitance Cc, fluorescent tube H, ceramic condenser Ct, ceramic condenser, one end of power Vcc respectively with resistance R, one end of K switch connects, the other end of K switch is connected with 2 pin of transformer T, 1 pin of transformer T respectively with the negative pole of diode two D2, the collector electrode of triode three Q3 connects, the emitter of triode three Q3 is connected with the positive pole of diode two D2 and earth terminal respectively, 3 pin of transformer T respectively with the negative pole of diode three D3, the collector electrode of triode four Q4 connects, the emitter of triode four Q4 is connected with the positive pole of diode three D3 and earth terminal respectively, 4 pin of transformer T are connected with one end of inductance L, the other end of inductance L is connected with one end of fluorescent tube H, the other end of fluorescent tube H is connected with one end of capacitance Cc, the other end of capacitance Cc is connected with 5 pin of transformer T, and the outside of fluorescent tube H is parallel with ceramic condenser Ct, it also comprises driving chip, triode one Q1, triode two Q2, diode one D1, biasing resistor Rb, variable resistor one RT1, variable resistor two RT2, electric capacity C, the base stage of described triode three Q3, the base stage of triode four Q4 are all connected with driving chip, one end of described ceramic condenser Ct is connected with driving chip, the other end of ceramic condenser Ct is connected with earth terminal, driving chip is connected with one end of variable resistor two RT2, the other end of variable resistor two RT2 is connected with the collector electrode of triode two Q2, the emitter of triode two Q2 is connected with one end of variable resistor one RT1 and earth terminal respectively, the other end of variable resistor one RT1 is connected with one end of variable resistor two RT2, the base stage of triode two Q2 is connected with one end of biasing resistor Rb, the other end of biasing resistor Rb is connected with the negative pole of diode and one end of electric capacity C respectively, the other end of electric capacity C is connected with earth terminal, the positive pole of diode one D1 is connected with the collector electrode of Electronic Control end and triode one Q1 respectively, the other end of described resistance R is connected with the collector electrode of triode one Q1, and the emitter of triode one Q1 is connected with earth terminal, and the base stage of triode one Q1 is connected with control signal.
The operation principle of this embodiment: before fluorescent tube starts, control signal V
0for low level, triode one Q1 ends, (this switch involves technical know-how to controlled switch K, can be understood as the electronic switch controlled by triode one Q1, during triode one Q1 conducting, K switch closes, when triode one Q1 ends, K switch disconnect) disconnect, driving chip not electric work, now supply voltage V
cCvia resistance R, diode one D1, electric capacity C is charged.Because time constant is very short, can think fluorescent tube start before moment, the voltage on electric capacity C oneself be charged to steady-state value, for start fluorescent tube time filament pre-heating prepare.
The start-up course of this embodiment is as follows:
One, warm-up phase: when fluorescent tube just starts, the reverse-biased cut-off of diode one D1, on electric capacity C, electric charge can only pass through biasing resistor R
brelease with the emitter junction of triode two Q2, form the base current of triode two Q2
this electric current is comparatively large, and make triode two Q2 be in full conjunction state, variable resistor two RT2 can regard direct ground connection as in lower end, the driving frequency of driving chip
the resonance frequency departing from fluorescent tube loop due to f is more, loop off resonance, resonant capacitance C
rboth end voltage is not enough to the fluorescent tube that ignites, and the electric current now flowing through fluorescent tube H is preheat curent, warm-up time and V
c, C, R
b, and the relating to parameters such as β of Q2, triode two Q2 maintains the full time of closing and is warm-up time.
Two, the frequency sweep stage: along with releasing of the electric charge on C, V
cdecline, i
breduce, work as i
bbe not enough to maintain when Q2 is full to be closed, Q2 enters magnifying state, and its collection is penetrated equivalent resistance and increased rapidly, causes driving frequency to reduce rapidly from pre-heat frequency, frequency sweep that Here it is, when frequency f is close to the resonance frequency f in fluorescent tube loop
0time, the voltage at Cr two ends is elevated to is enough to make fluorescent tube to ignite startup, the loop current mainly lamp current after fluorescent tube starts.
Three, the stabilization sub stage: after fluorescent tube starts, the upper residual charge of C continues to release, and when Vc hour Q2 conducting voltage, Q2 ended completely, and RT1 can regard open circuit as, and operating frequency is now
fluorescent tube carries out stable operation stage.
After adopting said structure; this embodiment beneficial effect is a kind of direct current fluorescent tube circuit with defencive function described in this embodiment; utilize startup stage electrode protection warm; play the protection of filament and the function of life startup stage of fluorescent tube, and have structure simple, arrange rationally, the advantage such as cost of manufacture is low.
The above, only in order to technical scheme of the present invention to be described and unrestricted, other amendment that those of ordinary skill in the art make technical scheme of the present invention or equivalently to replace, only otherwise depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (2)
1. have a direct current fluorescent tube circuit for defencive function, it comprises power supply, resistance, switch, triode three, triode four, diode two, diode three, transformer, inductance, capacitance, fluorescent tube, resonant capacitance, ceramic condenser, one end of power supply respectively with resistance, one end of switch connects, the other end of switch is connected with 2 pin of transformer, 1 pin of transformer respectively with the negative pole of diode two, the collector electrode of triode three connects, the emitter of triode three is connected with the positive pole of diode two and earth terminal respectively, 3 pin of transformer respectively with the negative pole of diode three, the collector electrode of triode four connects, the emitter of triode four is connected with the positive pole of diode three and earth terminal respectively, 4 pin of transformer are connected with one end of inductance, the other end of inductance is connected with one end of fluorescent tube, the other end of fluorescent tube is connected with one end of capacitance, the other end of capacitance is connected with 5 pin of transformer, and the outside of fluorescent tube is parallel with resonant capacitance, it is characterized in that: it also comprises driving chip, triode one, triode two, diode one, biasing resistor, variable resistor one, variable resistor two, electric capacity, the base stage of described triode three, the base stage of triode four are all connected with driving chip, one end of described ceramic condenser is connected with driving chip, the other end of ceramic condenser is connected with earth terminal, driving chip is connected with one end of variable resistor two, the other end of variable resistor two is connected with the collector electrode of triode two, the emitter of triode two is connected with one end of variable resistor one and earth terminal respectively, the other end of variable resistor one is connected with one end of variable resistor two, the base stage of triode two is connected with one end of biasing resistor, the other end of biasing resistor is connected with the negative pole of diode and one end of electric capacity respectively, the other end of electric capacity is connected with earth terminal, the positive pole of diode one is connected with the collector electrode of Electronic Control end and triode one respectively, the other end of described resistance is connected with the collector electrode of triode one, and the emitter of triode one is connected with earth terminal, and the base stage of triode one is connected with control signal.
2. one kind has the direct current fluorescent tube circuit of defencive function; it is characterized in that: its start-up course is as follows: when control signal transfers high level to, triode one is full conjunction state; switch closes; driving chip and triode three and triode four is made to obtain electric work; driving chip produces the two-phase square wave that a pair duty ratio is about less than 50%; after triode three, triode four amplification and transformer boost; obtain the excitation square wave of peak-to-peak value about 250V at transformer secondary output, add to the fluorescent tube loop be made up of capacitance, inductance, resonant capacitance and fluorescent tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510575788.3A CN105050303A (en) | 2015-09-11 | 2015-09-11 | Direct-current fluorescent lamp tube circuit with protective function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510575788.3A CN105050303A (en) | 2015-09-11 | 2015-09-11 | Direct-current fluorescent lamp tube circuit with protective function |
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Citations (7)
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|---|---|---|---|---|
| US20080165114A1 (en) * | 2007-01-10 | 2008-07-10 | Logah Technology Corp. | Lcd backlight driving device with an isolating transformer |
| US20080180037A1 (en) * | 2007-01-29 | 2008-07-31 | Empower Electronics, Inc | Electronic ballasts for lighting systems |
| US20090033244A1 (en) * | 2007-08-03 | 2009-02-05 | System General Corp. | Integrated circuit with a preheat control for a ballast |
| CN101365283A (en) * | 2007-08-08 | 2009-02-11 | 嘉善县嘉斯蒙实业有限公司 | Electronic ballast for HID flashlight |
| WO2010118626A1 (en) * | 2009-04-14 | 2010-10-21 | Zhang Yuqing | Electronic ballast for a fluorescent lamp and an energy-saving lamp |
| CN102316653A (en) * | 2011-09-05 | 2012-01-11 | 日银Imp微电子有限公司 | Electronic ballast for cold cathode fluorescent lamp |
| CN205249588U (en) * | 2015-09-11 | 2016-05-18 | 江西开昂科技股份有限公司 | Direct current fluorescent tube circuit with protect function |
-
2015
- 2015-09-11 CN CN201510575788.3A patent/CN105050303A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080165114A1 (en) * | 2007-01-10 | 2008-07-10 | Logah Technology Corp. | Lcd backlight driving device with an isolating transformer |
| US20080180037A1 (en) * | 2007-01-29 | 2008-07-31 | Empower Electronics, Inc | Electronic ballasts for lighting systems |
| US20090033244A1 (en) * | 2007-08-03 | 2009-02-05 | System General Corp. | Integrated circuit with a preheat control for a ballast |
| CN101365283A (en) * | 2007-08-08 | 2009-02-11 | 嘉善县嘉斯蒙实业有限公司 | Electronic ballast for HID flashlight |
| WO2010118626A1 (en) * | 2009-04-14 | 2010-10-21 | Zhang Yuqing | Electronic ballast for a fluorescent lamp and an energy-saving lamp |
| CN102316653A (en) * | 2011-09-05 | 2012-01-11 | 日银Imp微电子有限公司 | Electronic ballast for cold cathode fluorescent lamp |
| CN205249588U (en) * | 2015-09-11 | 2016-05-18 | 江西开昂科技股份有限公司 | Direct current fluorescent tube circuit with protect function |
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