CN102264185A - Electronic ballast for fluorescent lamp - Google Patents
Electronic ballast for fluorescent lamp Download PDFInfo
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- CN102264185A CN102264185A CN2011102383279A CN201110238327A CN102264185A CN 102264185 A CN102264185 A CN 102264185A CN 2011102383279 A CN2011102383279 A CN 2011102383279A CN 201110238327 A CN201110238327 A CN 201110238327A CN 102264185 A CN102264185 A CN 102264185A
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Abstract
The invention discloses electronic ballast for a fluorescent lamp, which comprises an inverter, a resonant circuit, a lamp tube and an electronic switch, wherein the inverter, the resonant circuit and the lamp tube are successively connected; and the electronic switch and a filament of the lamp tube are connected in series to form a filament preheating current loop, a control end of the electronic switch is connected with a control unit, a power module outputs DC voltage to the control unit, and the negative pole of an output end of the power module is connected with a controlled end of the electronic switch. In the technical scheme, the filament is preheated before activating the tube lamp, after the filament reaches electron emission temperature and the lamp tube is illuminated, redundant current can not pass through the filament, the nearly ideal working state of the fluorescent lamp from preheating and activation to the elimination of redundant filament current is realized, and the service life and the efficiency of the fluorescent lamp are increased. Moreover, relatively independent power module and high-frequency bootstrap circuit are adopted, so that the electronic ballast is isolated from the main circuit and is safe and reliable; a high floating voltage can be generated, a large amount of energy can be provided to drive a power switch, and the ideal working state of the fluorescent lamp can be realized.
Description
Technical field
The invention belongs to the electric ballast technical field, the electric ballast that relates in particular to a kind of filament preheating circuit of electronic ballast for fluoresent lamp and have this filament preheating circuit.
Background technology
The desirable working procedure of cathode preheat type fluorescent lamp is: before fluorescent tube starts, filament is carried out preheating, reach filament thermionic emission temperature after, light fluorescent tube after, the while does not allow unnecessary electric current pass through filament.Reach this perfect condition, the one, can prolong useful life of fluorescent lamp, significantly promote the switch number of times that fluorescent lamp can bear; The 2nd, can improve the energy conversion efficiency of fluorescent lamp; The 3rd, the voltage and current when reducing fluorescent lamp starting at double impacts, and improves the reliability and the useful life of electric ballast.Fig. 7, Fig. 8 are common electric ballast resonant circuit and semi-bridge inversion circuit of electronic ballast, and fluorescent lamp starting, makes the low-pressure mercury vapour discharge and lights fluorescent tube at capacitor C two ends generation high pressure by LC resonance.But behind lamp tube starting, filament does not need further heating, therefore just no longer needs the heating current process yet.And the defective of this circuit is: the startup stage, the resonant capacitance both end voltage rises, but can't form the heater current loop filament is carried out effective preheating, fluorescent tube enters non-pipeline start up by preheating (hard reboot), so not only influence the useful life of fluorescent tube, and need very high keep-alive voltage can threaten the reliability of whole circuit for lamp; And in the steady operation stage, heater chain gives filament a heater current that continues heating by capacitor C all the time, causes the filament electrode temperature to continue to raise, and not only damages burn-out life, and increases energy consumption.
In order to realize above-mentioned desirable fluorescent lamp operation program, as previously mentioned, must be in the filament preheating circuit of electric ballast, require to have a unsteady high voltage to drive power device in this circuit.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of electronic ballast for fluoresent lamp, has filament preheating circuit, this circuit carries out preheating to filament before fluorescent tube starts, after reaching filament thermionic emission temperature lamp tube starting, do not allow unnecessary electric current by filament, realize fluorescent lamp from preheating, start to the operating state of eliminating the unnecessary electric current near ideal of filament, improve the useful life and the efficient of fluorescent lamp.And adopt relatively independent power module and high frequency boostrap circuit, the one, isolate with main circuit, safe and reliable; The 2nd, can produce a unsteady high voltage, provide than macro-energy driving power switch, thereby realize the desirable operating state of fluorescent lamp.
In order to achieve the above object, the present invention has adopted following technical scheme:
A kind of electronic ballast for fluoresent lamp, comprise the inverter, resonant circuit and the fluorescent tube that connect successively, an and electronic switch, this electronic switch is connected with tube filament and is constituted the filament pre-heating current circuit, the control end of electronic switch connects control unit, the power module output DC is depressed into control unit, and the negative pole of output end of power module is connected with a controlled terminal of electronic switch.
In this technical scheme, the work of electric ballast is divided into pipeline start up by preheating stage and steady operation stage: in the pipeline start up by preheating stage, inverter output high-frequency alternating current, power module starts, and control unit drives the electronic switch conducting, and filament is because of being heated by electric current, in the warm-up time of setting, filament reaches the required temperature of thermionic emission, and control unit disconnects electronic switch, is eliminated by the unnecessary electric current on the filament; The voltage at resonant capacitance two ends raises, and lights fluorescent tube, and after this resonant capacitance both end voltage falls after rise, and fluorescent tube enters steady operation.The technical program adopts the negative pole of output end of power module and a controlled terminal of electronic switch to link together, high-frequency and high-voltage is superimposed upon on the direct voltage of power module output, method with bootstrapping, obtain to drive the high frequency voltage that floats electronic switch work, higher, thereby guaranteed the steady operation of electric ballast filament preheating circuit.
This programme adopts relatively independent power module to provide galvanic current to press to control unit, guaranteed reliability, stability and the anti-interference of control unit work, avoided control unit directly take a sample power supply from the heater current loop etc. and the circuit complexity, poor reliability, the instability that cause, be subject to disturb, problem that energy consumption is high.
Above-mentioned resonant circuit is the LC series resonant circuit.As preferably, the resonant capacitance in the described resonant circuit is connected across the interchange input side two ends (inbreeding stream mains side) of fluorescent tube thereby this resonant capacitance is in parallel with fluorescent tube.Like this, circuit structure with respect to " resonant capacitance is positioned at the interchange input offside (outbreeding stream mains side) of fluorescent tube " in the prior art, the foregoing circuit structure can be eliminated behind the lamp tube starting by the unnecessary electric current of filament, further improves the useful life and the efficient of fluorescent lamp.
Above-mentioned power module is a constant voltage dc source, comprises the current rectifying and wave filtering circuit and the voltage stabilizing circuit that connect successively, and its voltage stabilizing circuit can be made of a plurality of components and parts, also can be common on the market three-terminal voltage-stabilizing device, two end voltage-stabilizing devices.In the technical program, the negative pole of output end of described power module is connected with a controlled terminal of electronic switch, and the high frequency bootstrap voltage mode is provided, and has guaranteed the reliable control of control unit to electronic switch, has improved interference free performance.As preferably, above-mentioned power module is from the resonant inductance power taking, be that resonant inductance in the described resonant circuit has many group coils, primary coil inserts in the resonant circuit, secondary coil connects the input of power module, so not only can make full use of resonant inductance, reduce the volume of ballast, cut down the consumption of energy, and comprised the filament pre-heating current signal in the coupling at the resonant inductance place output, so just provide possibility and operation convenience for detecting filament pre-heating electric current, real-time regulated filament pre-heating electric current and time.
No matter be in pipeline start up by preheating stage or steady operation stage, what be applied to the resonant capacitance two ends and be lamp tube ends is alternating current all the time, electronic switch in this programme no doubt can be a single-way switch, but in order to raise the efficiency, to cut down the consumption of energy and guarantee reliability, the electronic switch that preferred employing can two-way admittance.This electronic switch can be an element, also can be the switching circuit that a plurality of elements constitute.One of preferred, described electronic switch comprises rectification full-bridge and power switch, two inputs of rectification full-bridge connect the two ends of fluorescent tube respectively, the output positive and negative charge of rectification full-bridge is connected with two controlled terminals of power switch respectively, the negative pole of output end of rectification full-bridge is connected with the negative pole of output end of power module, the control end of power switch is connected with the output of control unit, and described power switch is bipolar transistor, one-way SCR or field effect transistor; Preferred two, described electronic switch comprises bidirectional triode thyristor, two main electrodes of bidirectional triode thyristor connect the two ends of fluorescent tube respectively, and the negative pole of output end of power module is connected with first main electrode of bidirectional triode thyristor, and the gate pole of bidirectional triode thyristor is connected with the output of control unit.Circuit is simple like this, control is reliable, cost is low.In order to adapt to the demand of different fluorescent tubes, inverter and resonant circuit, adjust the filament pre-heating electric current, electronic switch can mate various elements or circuit structure constitutes different load characteristics, promptly as preferred, described electronic switch and a matching network are serially connected in the filament preheating circuit, and this matching network can be that in electric capacity, inductance, the resistance one or more constitute.
Above-mentioned control unit can adopt employing direct current supply common in the prior art, be used to control the control chip of electronic switch or the control circuit that constitutes by discrete component, it comprises the time block that is used to set filament preheating time, the power driver module that is used to produce the Logic control module of control signal and is used to drive electronic switch, and time block, Logic control module and power driver module are connected successively.Control unit relies on the ON time of controlling electronic switch according to the fluorescent tube characteristic predefined warm-up time like this.Further preferred, described control unit also comprises the current detection module that is used to detect the filament pre-heating electric current, the input of current detection module is connected to the output of current rectifying and wave filtering circuit in the described power module, and the output of current detection module is connected to described Logic control module.Like this can be according to the size control warm-up time of filament pre-heating electric current.
In addition, consider that the part fluorescent tube only relies on discharging current and ion bombardment filament electrode can't guarantee that filament thermionic emission temperature is to keep discharge condition, therefore preferred, a described electronic switch electric capacity in parallel,, form suitable filament heating current by tube filament and this electric capacity and can keep filament thermionic emission temperature during the stage at the ballast steady operation like this to keep discharge condition.
The present invention adopts relatively independent direct current of voltage regulation source module and high frequency boostrap circuit to power to control unit owing to adopted above technical scheme, not only guaranteed the reliably working of control unit, and internal resistance is little, and quiescent dissipation is low; Adopt control unit control electronic switch break-make, realized fluorescent lamp from preheating, start to the operating state of eliminating the unnecessary electric current near ideal of filament, effectively prolonged burn-out life, reduced the loss of electronics powder, reduced energy loss unnecessary on the filament, improved the efficiency of ballast, improved the useful life and the efficient of fluorescent lamp, and had that circuit is simple, volume is little, cost is low, good reliability, be suitable for advantages such as practicality.
Description of drawings
Fig. 1 is the schematic block circuit diagram of embodiment 1.
Fig. 2 is the circuit theory diagrams of embodiment 1.
Fig. 3 is the schematic block circuit diagram of embodiment 2.
Fig. 4 is the circuit theory diagrams of embodiment 2.
Fig. 5 is the circuit theory diagrams of embodiment 3.
Fig. 6 is the circuit theory diagrams of embodiment 4.
Fig. 7 is electric ballast resonant circuit figure common in the prior art.
Fig. 8 is typical semi-bridge inversion circuit of electronic ballast figure in the prior art.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is made a detailed explanation.
Embodiment 1:
A kind of electronic ballast for fluoresent lamp as shown in Figure 1 and Figure 2, comprise the inverter, resonant circuit and the fluorescent tube that connect successively, the two ends of described fluorescent tube LP (pin 2,3) are formation filament pre-heating current circuit thereby cross-over connection electronic switch 23 these electronic switches 23 are connected with tube filament, the control end of electronic switch 23 connects control unit 22, power module 21 output direct current of voltage regulation are to control unit 22, and the negative pole of output end of power module 21 is connected with a controlled terminal of electronic switch 23.
In the present embodiment, described resonant circuit is made of resonant inductance (choking coil L) and 1 series connection of resonance capacitor C, and resonant capacitance C1 is connected across the interchange input side two ends (pin 1,4) of fluorescent tube thereby this resonant capacitance C1 is in parallel with fluorescent tube.As shown in Figure 2, described electronic switch 23 comprises rectification full-bridge BR1 and power switch, this power switch is a bipolar transistor, two inputs of rectification full-bridge BR1 connect the two ends of fluorescent tube LP respectively, the output head anode C of rectification full-bridge BR1, negative pole A are connected with two controlled terminals (collector and emitter) of power switch respectively, the negative pole of output end A of rectification full-bridge BR1 is connected with the negative pole of output end of power module 21, and the control end of power switch (base stage) is connected with the output of control unit 22.Described control unit 22 comprises the time block that is used to set filament preheating time, the power driver module that is used to produce the Logic control module of control signal and is used to drive electronic switch, and time block, Logic control module and power driver module are connected successively.Resonant inductance in the described resonant circuit is choking coil L, has many group coils, and its primary coil (joint 1,2) inserts in the resonant circuit, and its secondary coil (joint 3,4) is as the input of power module.Thereby two controlled terminal cross-over connections, one capacitor C, 2 these capacitor C 2 of described electronic switch are in parallel with electronic switch.The back of connecting with electronic switch is inserted in the tube filament preheat curent loop thereby a controlled terminal of described electronic switch connects a capacitor C 3 these capacitor C 3.
In the present embodiment, described inverter can adopt circuit structure of the prior art, typical half bridge inverter circuit for example shown in Figure 8, and its principle and circuit structure are prior art, do not give unnecessary details for this reason.Described power module 21 comprises current rectifying and wave filtering circuit and the voltage stabilizing circuit that connects successively, current rectifying and wave filtering circuit comprises diode D1 and capacitor C 6, voltage stabilizing circuit comprises integrated voltage stabilizing chip and capacitor C 5, integrated voltage stabilizing chip is commercially available conventional chip, its principle and circuit structure are prior art, do not give unnecessary details for this reason.Circuit structures such as the time block in the described control unit, Logic control module and power driver module and principle are common technology, do not give unnecessary details for this reason, in order to simplify circuit structure, to reduce volume and reduce cost, each module that present embodiment adopts integrated in the control unit and the integrated circuit (IC) 1 of power switch.
The course of work of present embodiment is as follows:
After the electric ballast energized, inverter output high-frequency alternating current produces resonance through resonant circuit, high-frequency energy is arranged by choking coil L and be coupled to secondary coil, secondary coil connects diode D1 rectification, be filtering to the voltage stabilizing chip through capacitor C 6, the negative pole of output end of voltage stabilizing chip is connected on the BR1 node A, like this when the alternating voltage at BR1 two ends changes fluctuation, voltage stabilizing chip output voltage stabilization is for the IC1 reliably working provides key guarantee.In the pipeline start up by preheating stage, control unit 22 is opened electronic switch 23, the conducting of filament pre-heating current circuit, filament raises by temperature because of electric current, reach setting-up time (adjusted by C4 warm-up time) back control unit 22 and close electronic switch 23, the filament pre-heating current circuit disconnects, and when the voltage that produces when resonant capacitance C1 two ends is increased to the fluorescent tube keep-alive voltage, thereby the filament electrode of lamp tube ends makes gas ionization discharge light fluorescent tube; Resonant capacitance C1 both end voltage falls after rise behind the lamp tube starting, enters the steady operation stage, at this moment, relies on discharging current, ion bombardment filament electrode in the fluorescent tube and the discharge temp of keeping filament electrode through the filament heating current of capacitor C 2.
Embodiment 2:
A kind of electronic ballast for fluoresent lamp as shown in Figure 3, Figure 4 is with the different of embodiment 1: described power module is power supply fully independently, promptly directly from the civil power power taking; And cancelled the capacitor C 2 that the filament heating current is provided when steady operation.Other are identical with embodiment 1.
Embodiment 3:
A kind of electronic ballast for fluoresent lamp as shown in Figure 5, be with the different of embodiment 1: described control unit also comprises the current detection module that is used to detect the filament pre-heating electric current, the input of current detection module is connected to the output of current rectifying and wave filtering circuit in the described power module, and the output of current detection module is connected to described Logic control module.Whether the generation of current detection module detection filament pre-heating electric current, and output signal to Logic control module, controls warm-up time for Logic control module according to actual conditions.Other are identical with embodiment 1.
Embodiment 4:
A kind of electronic ballast for fluoresent lamp as shown in Figure 6, be with the different of embodiment 1: described electronic switch is bidirectional triode thyristor SCR, two main electrodes of bidirectional triode thyristor connect the two ends of fluorescent tube respectively, the negative pole of output end of power module is connected with first main electrode of bidirectional triode thyristor, and the gate pole of bidirectional triode thyristor is connected with the output of control unit; Adopt bidirectional triode thyristor, the integrated circuit (IC) 2 that comprises each module of control unit does not just need power switch.Other are identical with embodiment 1.
Claims (10)
1. electronic ballast for fluoresent lamp, comprise the inverter, resonant circuit and the fluorescent tube that connect successively, it is characterized in that, also comprise an electronic switch, this electronic switch is connected with tube filament and is constituted the filament pre-heating current circuit, the control end of this electronic switch connects control unit, and the power module output DC is depressed into control unit, and the negative pole of output end of power module is connected with a controlled terminal of electronic switch.
2. a kind of electronic ballast for fluoresent lamp according to claim 1 is characterized in that, and is in parallel with fluorescent tube thereby the resonant capacitance in the described resonant circuit is connected across this resonant capacitance of interchange input side two ends of fluorescent tube.
3. a kind of electronic ballast for fluoresent lamp according to claim 2, it is characterized in that, described electronic switch comprises rectification full-bridge and power switch, two inputs of rectification full-bridge connect the two ends of fluorescent tube respectively, the output positive and negative charge of rectification full-bridge is connected with two controlled terminals of power switch respectively, the negative pole of output end of rectification full-bridge is connected with the negative pole of output end of power module, and the control end of power switch is connected with the output of control unit.
4. a kind of electronic ballast for fluoresent lamp according to claim 3 is characterized in that, described power switch is bipolar transistor, one-way SCR or field effect transistor.
5. a kind of electronic ballast for fluoresent lamp according to claim 2, it is characterized in that, described electronic switch comprises bidirectional triode thyristor, two main electrodes of bidirectional triode thyristor connect the two ends of fluorescent tube respectively, the negative pole of output end of power module is connected with first main electrode of bidirectional triode thyristor, and the gate pole of bidirectional triode thyristor is connected with the output of control unit.
6. according to each described a kind of electronic ballast for fluoresent lamp in the claim 1 to 5, it is characterized in that, described control unit comprises the time block that is used to set filament preheating time, the power driver module that is used to produce the Logic control module of control signal and is used to drive electronic switch, and time block, Logic control module and power driver module are connected successively.
7. a kind of electronic ballast for fluoresent lamp according to claim 6 is characterized in that, the resonant inductance in the described resonant circuit has many group coils, and primary coil inserts in the resonant circuit, and secondary coil connects the input of power module.
8. a kind of electronic ballast for fluoresent lamp according to claim 7, it is characterized in that, described control unit also comprises the current detection module that is used to detect the filament pre-heating electric current, the input of current detection module is connected to the output of current rectifying and wave filtering circuit in the described power module, and the output of current detection module is connected to described Logic control module.
9. a kind of electronic ballast for fluoresent lamp according to claim 2 is characterized in that, a described electronic switch electric capacity in parallel.
10. a kind of electronic ballast for fluoresent lamp according to claim 2, it is characterized in that, the described electronic switch back of connecting with a matching network is inserted in the tube filament preheat curent loop, and this matching network is that in electric capacity, inductance, the resistance one or more constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102383279A CN102264185A (en) | 2011-08-19 | 2011-08-19 | Electronic ballast for fluorescent lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102383279A CN102264185A (en) | 2011-08-19 | 2011-08-19 | Electronic ballast for fluorescent lamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298226A (en) * | 2013-06-24 | 2013-09-11 | 蒋祖忠 | Intelligent electronic preheating cutoff ballast |
| CN109121272A (en) * | 2018-09-15 | 2019-01-01 | 徐宇伟 | A kind of discharge lamp with low-voltage intelligent formula starting ballasting circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201435865Y (en) * | 2009-06-24 | 2010-03-31 | 深圳市垅运照明电器有限公司 | Preheating circuit of electronic ballast |
| CN201499361U (en) * | 2009-09-17 | 2010-06-02 | 来献达 | Electronic ballast |
-
2011
- 2011-08-19 CN CN2011102383279A patent/CN102264185A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201435865Y (en) * | 2009-06-24 | 2010-03-31 | 深圳市垅运照明电器有限公司 | Preheating circuit of electronic ballast |
| CN201499361U (en) * | 2009-09-17 | 2010-06-02 | 来献达 | Electronic ballast |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298226A (en) * | 2013-06-24 | 2013-09-11 | 蒋祖忠 | Intelligent electronic preheating cutoff ballast |
| CN109121272A (en) * | 2018-09-15 | 2019-01-01 | 徐宇伟 | A kind of discharge lamp with low-voltage intelligent formula starting ballasting circuit |
| CN109121272B (en) * | 2018-09-15 | 2024-04-02 | 徐宇伟 | Discharge lamp with low-voltage intelligent starting ballasting circuit |
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Application publication date: 20111130 |