CN201039568Y - A cut-off protection circuit for electronic rectifier fluorescent lamp - Google Patents
A cut-off protection circuit for electronic rectifier fluorescent lamp Download PDFInfo
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- CN201039568Y CN201039568Y CNU2007200508283U CN200720050828U CN201039568Y CN 201039568 Y CN201039568 Y CN 201039568Y CN U2007200508283 U CNU2007200508283 U CN U2007200508283U CN 200720050828 U CN200720050828 U CN 200720050828U CN 201039568 Y CN201039568 Y CN 201039568Y
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- electric ballast
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Abstract
The utility model discloses an electronic ballast flourescent lamp cutout protection circuit, comprising an electronic ballast and a flourescent lamp, wherein, the flourescent lamp is connected with the electronic ballast; and a flourescent lamp cutout protection circuit is connected between the electronic ballast and the flourescent lamp. The flourescent lamp cutout protection circuit comprises a delay and cut-off circuit and a filament cut-off circuit, wherein, the delay and cut-off circuit is connected with the output terminal of the electronic ballast and is directly connected with a lamp tube through the filament cut-off circuit. The utility model can adequately preheat a filament before lightening the flourescent lamp, thus greatly prolonging the service life of the filament and enhancing the performance of equipment and instant impact resilience; when being lightened, the filament is automatically cut off, then the filament is in a zero current situation, thus greatly decreasing the temperature produced when the fluorescent lamp works, lowering the loss of the circuit and the flourescent lamp, enhancing energy utilization and effectively avoiding the phenomena that the light source of the flourescent lamp turns dim.
Description
Technical field
The utility model relates to a kind of fluorescent lamp that uses electric ballast, specifically is meant a kind of electric ballast fluorescent lamp current cutting protection circuit.
Background technology
Along with the continuous development of " green illumination " notion that requires illuminating energy-saving, minimizing environmental pollution, the protection ecological balance, mainly developed country and partly developing national formulation " green illumination plan " successively in the world, and obtained remarkable effect.
Fluorescent lamp, is also had higher requirement to the electric ballast of fluorescent-lamp-use owing to the light efficiency advantages of higher obtains promotion and application widely as a kind of lighting source simultaneously.Along with electronic technology and semiconductor technology constantly develop, the electric ballast that grows up on the high-frequency convertor technology basis also progressively moves to maturity with perfect, will replace traditional inductance type ballast rapidly with inevitable trend.
The electric ballast of current popular is generally based on current follow-up circuit, because its performance is influenced by complicated factors such as each side parameter and load, its reliability and EMC (Electro Magnetic Compatibility, electromagnetic compatibility) etc. all are difficult to reach requirement.At present, fluorescent lamp generally adopts cold start, shortcoming is: because the filament impedance is extremely low, and it is very big to open immediate current, can produce powerful impulse current, the life-span of serious threat electric ballast, more fragile device and equipment when particularly high-power fluorescent lamp starts, the development of unfavorable electric ballast also can be shortened lamp tube service life.Simultaneously, temperature is higher during because of existing fluorescent lamp operation, and circuit and fluorescent tube loss are big, and energy utilization rate is low, occurs blackening phenomena easily, influences user's normal use.
The utility model content
The problem that the utility model need solve provide a kind of reliable operation, circuit simple, can prolong fluorescent lamp and electric ballast life-span, reduce the electric ballast fluorescent lamp current cutting protection circuit of fluorescent tube blackhead phenomenon.
Designed a kind of electric ballast fluorescent lamp current cutting protection circuit according to the above-mentioned problem that needs to solve; comprise electric ballast and the fluorescent lamp that is connected with electric ballast; between electric ballast and fluorescent lamp, be connected with fluorescent lamp current cutting protection circuit; described fluorescent lamp current cutting protection circuit comprises time-delay cut-off circuit and filament cut-off circuit, and the time-delay cut-off circuit is connected with the output of electric ballast and is connected with fluorescent tube by the filament cut-off circuit.
Described electric ballast comprises power supply, EMC filter circuit, rectification circuit, circuit of power factor correction and oscillating circuit that order links to each other, and oscillating circuit is connected with fluorescent tube by the sensing current-limiting circuit.
Described time-delay cut-off circuit is by field effect transistor U5, triode U6, electrochemical capacitor C15, resistance R 26, R34, R36, R38, R40, rectifier bridge BR2 forms, the input of rectifier bridge BR2 is connected with the filament cut-off circuit with fluorescent tube, the output of rectifier bridge BR2 is by the positive pole of resistance R 36 with electrochemical capacitor C15, the base stage of triode U6 connects, the collector electrode of triode U6 is connected with an end of resistance R 38 and the grid of field effect transistor U5, the drain electrode of field effect transistor U5 is connected with the output of rectifier bridge BR2 by resistance R 34, the source electrode of field effect transistor U5, the minus earth of the emitter of triode U6 and electrochemical capacitor C15, resistance R 26 is connected between the electrochemical capacitor C15 both positive and negative polarity, and resistance R 40 is connected between the grid and source electrode of field effect transistor U5.Wherein, field effect transistor U5's is withstand voltage greater than 600V, and rectifier bridge BR2's is withstand voltage greater than 800V, and electrochemical capacitor C15's is withstand voltage greater than 50V, and capacity is between 22UF-50UF.
Described filament cut-off circuit is made up of capacitor C 16, C17, and capacitor C 16, C17 are connected to lamp tube ends respectively.
Between the output of electric ballast and fluorescent tube, also be connected with the sensing current-limiting circuit, described sensing current-limiting circuit is made up of capacitor C 4, C9, resistance R 19, R20 and diode D13, capacitor C 4 is serially connected in the output of the resonant inductance L4 in the electric ballast, its other end is connected with fluorescent lamp with an end of capacitor C 9, and the other end of capacitor C 9 is connected with the anode of diode D13 by resistance R 19, the R20 of serial connection.
Between the oscillating circuit of sensing current-limiting circuit and electric ballast, be connected with abnormity protection circuit; described abnormity protection circuit comprises controllable silicon U4; voltage stabilizing didoe D4; diode D5; resistance R 18; R21; capacitor C 10; C11; the negative electrode of diode D13 in the sensing current-limiting circuit and the negative electrode of voltage stabilizing didoe D4; the negative electrode of diode D5; one end of resistance R 21; the positive pole of electrochemical capacitor C10 connects; the anode of diode D5; the minus earth of the other end of resistance R 21 and electrochemical capacitor C10; the trigger electrode of the anode of voltage stabilizing didoe D4 and controllable silicon U4; one end of resistance R 18; one end of capacitor C 11 connects; the other end of resistance R 18; the other end of capacitor C 11 is connected with the main electrode of controllable silicon U4 and draws ground, and another main electrode of controllable silicon U4 is connected with the oscillating circuit in the electric ballast.
The utility model compared with prior art has following beneficial effect:
1. before fluorescent lamp lighting, filament is carried out abundant preheating, has prolonged the useful life of filament greatly, improved equipment performance and moment impact resistance.
2. automatically filament is cut off the power supply behind the filament spot, make filament be in " zero current " state, the loss of temperature when having reduced fluorescent lamp operation to a great extent and circuit and fluorescent lamp has improved rate of energy.
3. the filament outage combines with pipeline start up by preheating, can effectively avoid the generation of fluorescent light blackening phenomena.
4. circuit is simple and reliable, can ensure the circuit long-term stable operation, prolongs the life-span of electric ballast.
Description of drawings
Fig. 2 is the utility model electric ballast fluorescent lamp current cutting protection circuit theory diagrams.
Embodiment
Below with reference to accompanying drawing embodiment of the present utility model is elaborated:
As shown in Figure 1; electric ballast fluorescent lamp current cutting protection circuit; comprise electric ballast and the fluorescent lamp 9 formed by order continuous power supply 8, EMC filter circuit 1, rectification circuit 2, circuit of power factor correction 3 and oscillating circuit 4; oscillating circuit 4 is connected with fluorescent lamp 9 by sensing current-limiting circuit 5; fluorescent lamp 9 also is connected with fluorescent lamp current cutting protection circuit; described fluorescent lamp current cutting protection circuit comprises time-delay cut-off circuit 6 and filament cut-off circuit 7, and time-delay cut-off circuit 6 is connected with the output of oscillating circuit 4 and is connected with fluorescent tube by filament cut-off circuit 7.Wherein, the input of EMC filter circuit 1 links to each other with AC power 8, its output links to each other with rectification circuit, rectification circuit 2 can adopt the diode full bridge rectifier, the signal of telecommunication of its output outputs to oscillating circuit 4 after handling through circuit of power factor correction 3, the signal of oscillating circuit 4 output outputs in the filament of time-delay cut-off circuit 6 and fluorescent lamp 9 after handling through sensing current-limiting circuit 5, and filament cut-off circuit 7 links to each other with filament and time-delay cut-off circuit 6 in the fluorescent lamp 9.Sensing current-limiting circuit 5, time-delay cut-off circuit 6 appropriate design the time of fluorescent lamp 9 pipeline start up by preheating, prolonged the useful life of fluorescent lamp 9 and electric ballast greatly, reduce fluorescent tube blackhead phenomenon, ensure the circuit long-term stable operation, filament cut-off circuit 7 is used for blocking the electric current of the filament of flowing through after Filament of fluorescent lamp is lighted, thereby guarantees that filament is burnt because of working temperature is too high.
The utility model preferred embodiment, as shown in Figure 2.(the L end is power firestreak to the live wire of external ac power source, the N end is zero-power line, the G end is power ground) through protective tube F1, piezo-resistance VR1, the EMC filter circuit that common mode inductance L1, capacitor C 1, inductance L 2 forms and carry out the rectifying and wave-filtering processing by the bridge rectifier that full-bridge rectifier BR1 forms after, pass through chip IC 1, inductance L 3, switching tube U1 again, elements such as diode D2 carry out the APFC Active Power Factor Correction to be handled.The self-excited oscillation circuit of being made up of triode U2, U3 and pulse magnet ring T1 is connected with fluorescent lamp 9 by the sensing current-limiting circuit.Because EMC circuit, bridge rectifier, APFC and self-excited oscillation circuit are existing ripe circuit, those skilled in the art knows, and therefore its concrete annexation is not described.
Frame of broken lines in the circuit partly is described time-delay cut-off circuit 6 and filament cut-off circuit 7, time-delay cut-off circuit 6 is by field effect transistor U5, triode U6, electrochemical capacitor C15, resistance R 26, R34, R35, R36, R37, R38, R39, R40, R42, R43, rectifier bridge BR2 forms, the input of rectifier bridge BR2 is connected with the filament cut-off circuit with fluorescent tube, the output of rectifier bridge BR2 is by the resistance R 43 of serial connection, R36, the positive pole of R37 and electrochemical capacitor C15, the base stage of triode U6 connects, the collector electrode of triode U6 and the resistance R that is connected in series 39, R38, R42 is connected with the output of rectifier bridge BR2, the collector electrode of triode U6 is connected with the grid of field effect transistor U5, the drain electrode of field effect transistor U5 is by the resistance R 34 of serial connection, R35 is connected with the output of rectifier bridge BR2, the source electrode of field effect transistor U5, the minus earth of the emitter of triode U6 and electrochemical capacitor C15, resistance R 26 is connected between the electrochemical capacitor C15 both positive and negative polarity, and resistance R 40 is connected between the grid and source electrode of field effect transistor U5.Wherein, field effect transistor U5's is withstand voltage greater than 600V, and rectifier bridge BR2's is withstand voltage greater than 800V, and electrochemical capacitor C15's is withstand voltage greater than 50V, and capacity is between 22UF-50UF.
Filament cut-off circuit 7 is made up of capacitor C 16, C17, and capacitor C 16, C17 are connected to the tube filament two ends respectively.Resonant capacitance C13 is connected between resonance output and the ground.
Described sensing current-limiting circuit 5 is by capacitor C 4, C9, resistance R 19, R20 and diode D13, capacitor C 4 is serially connected in the output of the resonant inductance L4 in the electric ballast, its other end is connected with fluorescent lamp with an end of capacitor C 9, and the other end of capacitor C 9 is connected with the anode of diode D13 by resistance R 19, the R20 of serial connection.
Between the oscillating circuit of sensing current-limiting circuit and electric ballast, be connected with abnormity protection circuit; described abnormity protection circuit comprises controllable silicon U4; voltage stabilizing didoe D4; diode D5; resistance R 18; R21; capacitor C 10; C11; the negative electrode of diode D13 in the sensing current-limiting circuit and the negative electrode of voltage stabilizing didoe D4; the negative electrode of diode D5; one end of resistance R 21; the positive pole of electrochemical capacitor C10 connects; the anode of diode D5; the minus earth of the other end of resistance R 21 and electrochemical capacitor C10; the trigger electrode of the anode of voltage stabilizing didoe D4 and controllable silicon U4; one end of resistance R 18; one end of capacitor C 11 connects; the other end of resistance R 18; the other end of capacitor C 11 is connected with the main electrode of controllable silicon U4 and draws ground, and another main electrode of controllable silicon U4 is connected with the oscillating circuit in the electric ballast.
The utility model electric ballast fluorescent lamp current cutting protection circuit working principle is: when fluorescent lamp starting; obtain resonance potential from capacitor C 13; make rectifier bridge BR2 conducting through capacitor C 16; again through resistance R 43; R36; R37 gives electrochemical capacitor C15 charging; triode U6 conducting after electrochemical capacitor C15 charging is finished; field effect transistor U5 conducting thereupon; the time that discharges and recharges of electrochemical capacitor C15 provides a rational warm-up time to Filament of fluorescent lamp; lamp tube ends and be connected to capacitor C 16 after fluorescent lamp 9 is lighted; C17, thus make rectifier bridge BR2; triode U6 and field effect transistor U5 are by work.Filament relies on capacitor C 16, and C17 disconnects, and filament does not have electric current.Thereby the temperature when having reduced fluorescent lamp operation has to a great extent reduced the loss of circuit and fluorescent lamp, has improved rate of energy, and the while combines with the sensing current-limiting circuit, can avoid the phenomenon of the easy blackening of fluorescent light to take place effectively.
Claims (7)
1. electric ballast fluorescent lamp current cutting protection circuit; comprise electric ballast and the fluorescent lamp that is connected with electric ballast; it is characterized in that: between electric ballast and fluorescent lamp, be connected with fluorescent lamp current cutting protection circuit; described fluorescent lamp current cutting protection circuit comprises time-delay cut-off circuit and filament cut-off circuit, and the time-delay cut-off circuit is connected with the output of electric ballast and is connected with fluorescent tube by the filament cut-off circuit.
2. electric ballast fluorescent lamp current cutting protection circuit according to claim 1; it is characterized in that: described time-delay cut-off circuit is by field effect transistor U5; triode U6; electrochemical capacitor C15; resistance R 26; R34; R36; R38; R40; rectifier bridge BR2 forms; the input of rectifier bridge BR2 is connected with the filament cut-off circuit with fluorescent tube; the output of rectifier bridge BR2 is by the positive pole of resistance R 36 with electrochemical capacitor C15; the base stage of triode U6 connects; the collector electrode of triode U6 is connected with an end of resistance R 38 and the grid of field effect transistor U5; the drain electrode of field effect transistor U5 is connected with the output of rectifier bridge BR2 by resistance R 34; the source electrode of field effect transistor U5; the minus earth of the emitter of triode U6 and electrochemical capacitor C15; resistance R 26 is connected between the electrochemical capacitor C15 both positive and negative polarity, and resistance R 40 is connected between the grid and source electrode of field effect transistor U5.
3. electric ballast fluorescent lamp current cutting protection circuit according to claim 2, it is characterized in that: field effect transistor U5's is withstand voltage greater than 600V, and rectifier bridge BR2's is withstand voltage greater than 800V, and electrochemical capacitor C15's is withstand voltage greater than 50V, and capacity is between 22UF-50UF.
4. electric ballast fluorescent lamp current cutting protection circuit according to claim 2, it is characterized in that: described filament cut-off circuit is made up of capacitor C 16, C17, and capacitor C 16, C17 are connected to lamp tube ends respectively.
5. electric ballast fluorescent lamp current cutting protection circuit according to claim 4; it is characterized in that: between the output of electric ballast and fluorescent tube, also be connected with the sensing current-limiting circuit; described sensing current-limiting circuit is made up of transformer L4, capacitor C 4, C9, resistance R 19, R20 and diode D13; the end of transformer L4 is connected with the output of oscillating circuit; its other end is connected with an end of capacitor C 4; the other end of capacitor C 4 is connected with fluorescent tube with an end of capacitor C 9, and the other end of capacitor C 9 is connected with the anode of diode D13 by resistance R 19, the R20 of serial connection.
6. electric ballast fluorescent lamp current cutting protection circuit according to claim 5; it is characterized in that: between the oscillating circuit of sensing current-limiting circuit and electric ballast, be connected with abnormal state protection circuit; described abnormal state protection circuit comprises controllable silicon U4; voltage stabilizing didoe D4; diode D5; resistance R 18; R21; capacitor C 10; C11; the negative electrode of diode D13 in the sensing current-limiting circuit and the negative electrode of voltage stabilizing didoe D4; the negative electrode of diode D5; one end of resistance R 21; the positive pole of electrochemical capacitor C10 connects; the anode of diode D5; the minus earth of the other end of resistance R 21 and electrochemical capacitor C10; the trigger electrode of the anode of voltage stabilizing didoe D4 and controllable silicon U4; one end of resistance R 18; one end of capacitor C 11 connects; the other end of resistance R 18; the other end of capacitor C 11 is connected with the main electrode of controllable silicon U4 and draws ground, and another main electrode of controllable silicon U4 is connected with the oscillating circuit in the electric ballast.
7. electric ballast fluorescent lamp current cutting protection circuit according to claim 6; it is characterized in that: described electric ballast; comprise power supply, EMC filter circuit, rectification circuit, circuit of power factor correction and oscillating circuit that order links to each other, oscillating circuit is connected with fluorescent tube by the sensing current-limiting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200508283U CN201039568Y (en) | 2007-04-24 | 2007-04-24 | A cut-off protection circuit for electronic rectifier fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200508283U CN201039568Y (en) | 2007-04-24 | 2007-04-24 | A cut-off protection circuit for electronic rectifier fluorescent lamp |
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| Publication Number | Publication Date |
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| CN201039568Y true CN201039568Y (en) | 2008-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200508283U Expired - Fee Related CN201039568Y (en) | 2007-04-24 | 2007-04-24 | A cut-off protection circuit for electronic rectifier fluorescent lamp |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938880A (en) * | 2009-06-30 | 2011-01-05 | 通用电气公司 | Ballast with end of life protection function for one or more lamps |
| CN101652014B (en) * | 2009-09-17 | 2013-06-19 | 来献达 | Electronic ballast |
| CN106870974A (en) * | 2017-03-01 | 2017-06-20 | 深圳驰迅科技有限公司 | A kind of Multi-function compatible type fluorescent tube |
-
2007
- 2007-04-24 CN CNU2007200508283U patent/CN201039568Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938880A (en) * | 2009-06-30 | 2011-01-05 | 通用电气公司 | Ballast with end of life protection function for one or more lamps |
| CN101938880B (en) * | 2009-06-30 | 2014-09-10 | 通用电气公司 | Ballast with end of life protection function for one or more lamps |
| CN101652014B (en) * | 2009-09-17 | 2013-06-19 | 来献达 | Electronic ballast |
| CN106870974A (en) * | 2017-03-01 | 2017-06-20 | 深圳驰迅科技有限公司 | A kind of Multi-function compatible type fluorescent tube |
| CN106870974B (en) * | 2017-03-01 | 2020-08-11 | 深圳驰迅科技有限公司 | Multifunctional compatible lamp tube |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TCL CORPORATION Free format text: FORMER OWNER: HUIZHOU TCL LIGHTING ELECTRIC APPLIANCE CO., LTD. Effective date: 20080905 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080905 Address after: Technical center, 8 floor, TCL Arts crafts emporium, No. 6 Goose Road South, Guangdong, Huizhou, China: 516001 Patentee after: TCL Group Co., Ltd. Address before: Guangdong province Huizhou City Zhongkai high tech Development Zone District No. 9, zip code: 516006 Patentee before: Huizhou TCL Lighting Appliance Co., Ltd. |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080319 Termination date: 20130424 |