CN101415288A - Light-adjusting circuit for electrodeless florescent lamp - Google Patents
Light-adjusting circuit for electrodeless florescent lamp Download PDFInfo
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- CN101415288A CN101415288A CNA200810203395XA CN200810203395A CN101415288A CN 101415288 A CN101415288 A CN 101415288A CN A200810203395X A CNA200810203395X A CN A200810203395XA CN 200810203395 A CN200810203395 A CN 200810203395A CN 101415288 A CN101415288 A CN 101415288A
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Abstract
The invention discloses the dimming circuit of an electrodeless fluorescent lamp. The dimming circuit is connected with an electrodeless fluorescent lamp circuit. The electrodeless fluorescent lamp circuit comprises an active power factor corrector, a central processing unit, an electromagnetic inductor and a power take-off at least. The dimming circuit comprises a sawtooth generator used for generating sawtooth, a potentiometer having an adjustable resistance value and a voltage comparator which is connected with the potentiometer and also connected with the sawtooth generator. The potentiometer adjusts the resistance value to produce an adjustable voltage, and the voltage comparator compares the adjustable voltage with the sawtooth generated by the sawtooth generator to generate a square signal that changes linearly. The dimming circuit also comprises an optoelectronic isolator which is connected with the voltage comparator and also connected with the central processing unit and receives the square signal produced by the voltage comparator to produce a PWM signal so as to concoct the central processing unit. The dimming circuit increases the function of monitoring running conditions of a strip lamp and performing real-time protection and prolongs the service life.
Description
Technical field
The present invention relates to the electrodeless fluorescent circuit for lamp, relate in particular to a kind of light adjusting circuit that is used for the electrodeless florescent lamp pulse-width modulation.
Background technology
Electrodeless florescent lamp belongs to the new-generation energy-saving product of no filament, high light efficiency, long-life, high power factor, is widely used, the place that should not change of fluorescent tube particularly.Because electrodeless florescent lamp belongs to electrodeless startup and lights, fluorescent tube is not existed because of filament damages or the electronics powder launch and the sputter of electronics powder causes problem such as fluorescent tube blackout to put in order the phenomenon that lamp is scrapped, put in order the lamp life-span to prolong greatly.And operating frequency exceeds 250KHz, can eliminate stroboscopic phenomenon.But the difficulty of the circuit design of electrodeless florescent lamp is bigger, and especially electrodeless florescent lamp light adjusting circuit difficulty is bigger, and also there are many problems in the electrodeless florescent lamp light adjusting circuit that has at present.
Fig. 1 is the circuit diagram of the electrodeless fluorescent circuit for lamp of prior art, does not comprise among Fig. 1 that anti-emi filter, bridge rectifier and active power factor corrector, this several sections are the universal component of electrodeless florescent lamp, just no longer describes here.In the circuit as shown in Figure 1, semi-bridge inversion oscillating circuit, central processing unit HY4501, electromagnetic inductor L4, power take off L3 that metal-oxide-semiconductor Q1 and Q2 constitute.Also comprise some other auxiliary circuit among this figure, comprise the start-up control circuit, these are not that of the present invention this advances part, will continue to continue to use for these circuit in the technical scheme of the present invention, have not therefore just elaborated.Traditional electrodeless florescent lamp light adjusting circuit shown in Figure 1 with and protective circuit, central processing unit is the HY4501 chip, this chip is frequency modulation light modulation chip and has simple abnormity protection circuit that power take off L3 is an inductance.The operating frequency of the electrodeless florescent lamp of prior art is about 250KHz, between the light efficiency 50-60Lm/W.During light modulation, lamp power changes with the chip oscillate frequency shift, and dimming scope little (50% light modulation) and have lamp can't start phenomenon from putting out with low-power.Simultaneously; use HY4501 single now, do not have output short-circuit, empty magnet ring and overpower protection function as the central processing unit defencive function; shortage can not in time be adjusted the operating state of electrodeless florescent lamp according to real-time ruuning situation to the accurate sampling monitoring of the voltage and current of electrodeless florescent lamp.
Summary of the invention
The purpose of this invention is to provide a kind of 0-5V impulse width modulation and light adjusting circuit that is used for the electrodeless fluorescent circuit for lamp, it can control the power of adjusting electrodeless florescent lamp according to the semi-bridge inversion metal-oxide-semiconductor is driven pulse-width modulation, promptly realizes dimming function.
Another object of the present invention provides a kind of electrodeless fluorescent circuit for lamp, and the above-mentioned impulse width modulation and light adjusting circuit of its use is realized the power adjustment to electrodeless florescent lamp, promptly realizes dimming function.
According to an aspect of the present invention, a kind of light adjusting circuit of electrodeless florescent lamp is provided, be connected on the electrodeless fluorescent circuit for lamp, the electrodeless fluorescent circuit for lamp comprises active power factor corrector, central processing unit, electromagnetic inductor and power take off at least, and this light adjusting circuit comprises:
Saw-toothed wave generator is used to produce sawtooth waveforms;
Potentiometer, potentiometer have adjustable resistance value;
Voltage comparator links to each other with potentiometer, also links to each other with saw-toothed wave generator, and potentiometer is adjusted resistance value and produced an adjustable-voltage, and voltage comparator compares the sawtooth waveforms of this adjustable-voltage and saw-toothed wave generator generation, generates the square-wave signal of linear change;
Photoisolator links to each other with voltage comparator, is also connected to central processing unit, and photoisolator receives the square-wave signal that voltage comparator produces, and generates pwm signal modulation central processing unit.
In one embodiment, this electrodeless fluorescent circuit for lamp also comprises sample circuit, links to each other with power take off and central processing unit, and sample circuit comprises:
Lamp current sampled signal device links to each other with power take off and described central processing unit, the current signal of sampling lamp;
The lamp voltage sample annunciator links to each other with power take off and described central processing unit, the voltage signal of sampling lamp.
This lamp voltage sample annunciator comprises resistance and the electric capacity that is connected on the power take off; And the lamp voltage sample annunciator comprises resistance and the electric capacity that is connected in parallel on the power take off.
In one embodiment, central processing unit is the HY4503 chip.
In one embodiment, the electrodeless fluorescent circuit for lamp also comprises:
Capacitance-resistance vibration timer is connected to central processing unit, and capacitance-resistance vibration timer comprises electric capacity and resistance;
Protective circuit links to each other with power take off and central processing unit, and according to the current and voltage signals of sample circuit collection, and the instruction of central processing unit is protected circuit.
According to a further aspect in the invention, provide a kind of electrodeless fluorescent circuit for lamp, comprising:
Active power factor corrector;
Power take off links to each other with active power factor corrector;
Electromagnetic inductor links to each other with power take off, is also connected to the electrodeless florescent lamp fluorescent tube;
Central processing unit,
Also comprise light adjusting circuit, this light adjusting circuit comprises,
Saw-toothed wave generator is used to produce sawtooth waveforms;
Potentiometer, potentiometer have adjustable resistance value;
Voltage comparator links to each other with potentiometer, also links to each other with saw-toothed wave generator, and potentiometer is adjusted resistance value and produced an adjustable-voltage, and voltage comparator compares the sawtooth waveforms of this adjustable-voltage and saw-toothed wave generator generation, generates the square-wave signal of linear change;
Photoisolator links to each other with described voltage comparator, is also connected to central processing unit, and photoisolator receives the square-wave signal that voltage comparator produces, and generates pwm signal modulation central processing unit.
In one embodiment, this electrodeless fluorescent circuit for lamp also comprises sample circuit, links to each other with power take off and central processing unit, and sample circuit comprises:
Lamp current sampled signal device links to each other with power take off and central processing unit, the current signal of sampling lamp;
The lamp voltage sample annunciator links to each other with power take off and central processing unit, the voltage signal of sampling lamp.
Wherein, this lamp voltage sample annunciator comprises resistance and the electric capacity that is connected on the power take off; And the lamp voltage sample annunciator comprises resistance and the electric capacity that is connected in parallel on the power take off.
In one embodiment, this electrodeless fluorescent circuit for lamp also comprises:
Capacitance-resistance vibration timer is connected to central processing unit, and capacitance-resistance vibration timer comprises electric capacity and resistance;
Protective circuit links to each other with power take off and described central processing unit, and according to the current and voltage signals of sample circuit collection, and the instruction of central processing unit is protected circuit.
In one embodiment, this electrodeless fluorescent circuit for lamp also comprises:
Anti-interference em filtering device links to each other with the input power supply;
Bridge rectifier links to each other with anti-interference em filtering device, is also connected to active power factor corrector;
The start-up control circuit links to each other with the input power supply, is also connected to electrodeless lamp.
According to realization of the present invention, protective circuit can by a plurality of resistance and a plurality of electric capacity connect with power take off the back and form.Potentiometer can be designed in the 0-5V scope, and voltage comparator is designed to the low-loss voltage comparator.
The invention provides a kind of electrodeless fluorescent circuit for lamp that is used for the impulse width modulation and light adjusting circuit of electrodeless florescent lamp and uses this light adjusting circuit, increased for the monitoring of lamp operation situation simultaneously and carry out real-time guard, can effectively prolong its useful life.
Description of drawings
The above and other features of the present invention, character and advantage will become more obvious by the description below in conjunction with drawings and Examples, in the accompanying drawings, identical Reference numeral is represented identical feature all the time, wherein:
Fig. 1 is the partial circuit figure of the electrodeless fluorescent circuit for lamp of conventional art;
Fig. 2 is the block diagram of the partial circuit of electrodeless fluorescent circuit for lamp of the present invention;
Fig. 3 is the circuit diagram of the partial circuit of electrodeless fluorescent circuit for lamp of the present invention.
Embodiment
The present invention has disclosed a kind of light adjusting circuit of electrodeless florescent lamp, is connected on the electrodeless fluorescent circuit for lamp, and this electrodeless fluorescent circuit for lamp comprises active power factor corrector, central processing unit, electromagnetic inductor and power take off at least, and this light adjusting circuit comprises:
Saw-toothed wave generator is used to produce sawtooth waveforms;
Potentiometer, potentiometer have adjustable resistance value;
Voltage comparator links to each other with potentiometer, also links to each other with saw-toothed wave generator, and potentiometer is adjusted resistance value and produced an adjustable-voltage, and voltage comparator compares the sawtooth waveforms of this adjustable-voltage and saw-toothed wave generator generation, generates the square-wave signal of linear change;
Photoisolator links to each other with voltage comparator, is also connected to central processing unit, and photoisolator receives the square-wave signal that voltage comparator produces, and generates pwm signal modulation central processing unit.
This electrodeless fluorescent circuit for lamp also comprises sample circuit, links to each other with power take off and central processing unit, and sample circuit comprises lamp current sampled signal device and lamp voltage sample annunciator.Lamp current sampled signal device links to each other with power take off and described central processing unit, the current signal of sampling lamp, and this lamp voltage sample annunciator can comprise resistance and the electric capacity that is connected on the power take off.The lamp voltage sample annunciator links to each other with power take off and central processing unit, the voltage signal of sampling lamp, and this lamp voltage sample annunciator comprises resistance and the electric capacity that is connected in parallel on the power take off.
Central processing unit can adopt the HY4503 chip.
This electrodeless fluorescent circuit for lamp also comprises capacitance-resistance vibration timer and protective circuit, and wherein capacitance-resistance vibration timer is connected to central processing unit, and this capacitance-resistance vibration timer comprises electric capacity and resistance.Protective circuit links to each other with power take off and central processing unit, and according to the current and voltage signals of sample circuit collection, and the instruction of central processing unit is protected circuit.
The present invention has also disclosed a kind of electrodeless fluorescent circuit for lamp, and with reference to shown in Figure 2, Fig. 2 is the block diagram of the partial circuit of electrodeless fluorescent circuit for lamp of the present invention.This electrodeless fluorescent circuit for lamp comprises:
Active power factor corrector 201;
Power take off 208 links to each other with active power factor corrector 201;
This electrodeless fluorescent circuit for lamp also comprises light adjusting circuit, and this light adjusting circuit comprises,
Saw-toothed wave generator 206 is used to produce sawtooth waveforms;
Potentiometer 205, potentiometer 205 has adjustable resistance value, and potentiometer can be designed to by adjusting the voltage in its resistance value generation 0-5V scope;
Voltage comparator 204, link to each other with potentiometer 205, also link to each other with saw-toothed wave generator 206, potentiometer 205 is adjusted resistance value and is produced an adjustable-voltage, voltage comparator 204 compares the sawtooth waveforms of this adjustable-voltage and saw-toothed wave generator 206 generations, generates the square-wave signal of linear change; This voltage comparator 204 is low power consumption voltage comparators;
Continuation is with reference to figure 2, and this electrodeless fluorescent circuit for lamp also comprises:
Capacitance-resistance vibration timer 2 02 is connected to central processing unit 207, and capacitance-resistance vibration timer comprises electric capacity and resistance;
Need to prove that though do not illustrate, according to the basic general knowledge in this area, the electrodeless fluorescent circuit for lamp can also comprise following parts in Fig. 2:
Anti-interference em filtering device links to each other with the input power supply;
Bridge rectifier links to each other with anti-interference em filtering device, is also connected to active power factor corrector;
The start-up control circuit links to each other with the input power supply, is also connected to electrodeless lamp.
The basic functional principle of electrodeless fluorescent circuit for lamp of the present invention is as follows: the electrodeless fluorescent circuit for lamp includes source power factor correcting device 201, central processing unit 207, electromagnetic inductor 209 and power take off 208, active power factor corrector 201 is connected to power take off 208, and it is to press for late-class circuit provides galvanic current.Electromagnetic inductor 209 also is connected to power take off 208, is also connected to electrodeless lamp fluorescent tube (not shown).Power take off 208 is used to provide power output.Central processing unit 207 does not directly link to each other with above-mentioned each parts, and it is the operation that is used to control entire circuit.Light adjusting circuit of the present invention is to be connected on the above-mentioned electrodeless fluorescent circuit for lamp, and this light adjusting circuit comprises saw-toothed wave generator, voltage comparator, photoisolator and potentiometer composition.Light adjusting circuit links to each other with central processing unit 207, carries out light modulation based on the principle of pulse-width modulation.Basic process based on pulse-width modulation is as follows: potentiometer is adjusted resistance value and is produced an adjustable-voltage, and voltage comparator compares the sawtooth waveforms of this adjustable-voltage and saw-toothed wave generator generation, generates the square-wave signal of linear change; This voltage comparator is the low power consumption voltage comparator.Photoisolator receives the square-wave signal that voltage comparator produces, and generates pwm signal modulation central processing unit.The operating voltage of this light adjusting circuit and central processing unit operating voltage common-battery are pressed (also can provide voltage to it separately), and from the central processing unit operating voltage 5V control voltage signal of taking a sample out.Capacitance-resistance vibration timer 2 02 links to each other with central processing unit 207, and it is the minimum and the highest operating frequency that is used for determining central processing unit 207.
Fig. 3 is the circuit diagram of the partial circuit of electrodeless fluorescent circuit for lamp of the present invention.Need to prove that Fig. 3 is the partial circuit of one embodiment of the present of invention, i.e. the circuit diagram of light adjusting circuit part.As shown in Figure 3, the central processing unit that uses among this embodiment is the HY4503 chip, and this chip is an electric ballast special circuit with dimming function, and its dimming scope is between 10%-100%.In this embodiment, the pulsewidth adjusting control circuit is made up of saw-toothed wave generator (being made up of resistance R 303-R306, capacitor C 301, diode D300), optical-electrical converter IC301, voltage comparator ic 300 and potentiometer RL, the resistance value of potentiometer RL is adjustable, the 0-5V voltage of its generation and sawtooth waveforms compare the square-wave signal that produces a linear change, have only tens hertz pwm signal to remove to modulate central microprocessor IC302 output pulse width signal through the photoisolator generation, promote duty cycle square wave to change its high low side.Thereby carry out light modulation under the dominant frequency situation not changing.This circuit has increased time delay resistance R302 and capacitor C 300 in order to make it can both normally start the spy under any light modulation, and it is in parallel with adjustable potentiometer RL.The operating voltage of this light adjusting circuit can independently also can directly extracted from central microprocessor work voltage outside the ballast circuit, 5V voltage then be on the operating voltage through resistance R 300, resistance R 301, potentiometer RL dividing potential drop, and and potentiometer RL series connection obtain.This circuit is also according to empty magnet ring of the work characteristics working load of electrodeless florescent lamp open circuit short circuit and overpower protective circuit.To guarantee that ballast is not damaged under the abnormal work state.
Anti-interference em filtering device, bridge rectifier, protective circuit and start-up control circuit in the light adjusting circuit of the present invention all be adopt with prior art in identical circuit; this is known for those skilled in the art; therefore just no longer done detailed description here, also just no longer provided for the circuit diagram of these parts.Use the electrodeless florescent lamp of this kind circuit can in the wide-voltage range of 85V-265V, carry out light modulation, and can be according to abnormal protection is carried out in the monitoring of lamp current and voltage signal.
The invention provides a kind of electrodeless fluorescent circuit for lamp that is used for the pulsewidth light adjusting circuit of electrodeless florescent lamp and uses this light adjusting circuit, increased for the monitoring of lamp operation situation and carry out the real-time guard function, prolonged its useful life.
The foregoing description provides to being familiar with the person in the art and realizes or use of the present invention; those skilled in the art can be under the situation that does not break away from invention thought of the present invention; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (10)
1. the light adjusting circuit of an electrodeless florescent lamp, be connected on the electrodeless fluorescent circuit for lamp, described electrodeless fluorescent circuit for lamp comprises active power factor corrector, central processing unit, electromagnetic inductor and power take off at least, it is characterized in that, described light adjusting circuit comprises:
Saw-toothed wave generator is used to produce sawtooth waveforms;
Potentiometer, potentiometer have adjustable resistance value;
Voltage comparator, link to each other with described potentiometer, also link to each other with described saw-toothed wave generator, described potentiometer is adjusted resistance value and is produced an adjustable-voltage, described voltage comparator compares the sawtooth waveforms of this adjustable-voltage and saw-toothed wave generator generation, generates the square-wave signal of linear change;
Photoisolator links to each other with described voltage comparator, is also connected to described central processing unit, and described photoisolator receives the square-wave signal that voltage comparator produces, and generates pwm signal and modulates described central processing unit.
2. light adjusting circuit as claimed in claim 1 is characterized in that, described electrodeless fluorescent circuit for lamp also comprises sample circuit, links to each other with described power take off and described central processing unit, and described sample circuit comprises:
Lamp current sampled signal device links to each other with described power take off and described central processing unit, the current signal of sampling lamp;
The lamp voltage sample annunciator links to each other with described power take off and described central processing unit, the voltage signal of sampling lamp.
3. light adjusting circuit as claimed in claim 2 is characterized in that,
Described lamp voltage sample annunciator comprises resistance and the electric capacity that is connected on the power take off;
Described lamp voltage sample annunciator comprises resistance and the electric capacity that is connected in parallel on the power take off.
4. light adjusting circuit as claimed in claim 1 is characterized in that, described central processing unit is the HY4503 chip.
5. light adjusting circuit as claimed in claim 1 is characterized in that, described electrodeless fluorescent circuit for lamp also comprises:
Capacitance-resistance vibration timer is connected to central processing unit, and described capacitance-resistance vibration timer comprises electric capacity and resistance;
Protective circuit links to each other with described power take off and described central processing unit, and according to the current and voltage signals of described sample circuit collection, and the instruction of described central processing unit is protected circuit.
6. electrodeless fluorescent circuit for lamp comprises:
Active power factor corrector;
Power take off links to each other with described active power factor corrector;
Electromagnetic inductor links to each other with described power take off, is also connected to the electrodeless florescent lamp fluorescent tube;
Central processing unit,
It is characterized in that, also comprise light adjusting circuit, this light adjusting circuit comprises,
Saw-toothed wave generator is used to produce sawtooth waveforms;
Potentiometer, potentiometer have adjustable resistance value;
Voltage comparator, link to each other with described potentiometer, also link to each other with described saw-toothed wave generator, described potentiometer is adjusted resistance value and is produced an adjustable-voltage, described voltage comparator compares the sawtooth waveforms of this adjustable-voltage and saw-toothed wave generator generation, generates the square-wave signal of linear change;
Photoisolator links to each other with described voltage comparator, is also connected to described central processing unit, and described photoisolator receives the square-wave signal that voltage comparator produces, and generates pwm signal and modulates described central processing unit.
7. electrodeless fluorescent circuit for lamp as claimed in claim 6 is characterized in that, described electrodeless fluorescent circuit for lamp also comprises sample circuit, links to each other with described power take off and described central processing unit, and described sample circuit comprises:
Lamp current sampled signal device links to each other with described power take off and described central processing unit, the current signal of sampling lamp;
The lamp voltage sample annunciator links to each other with described power take off and described central processing unit, the voltage signal of sampling lamp.
8. electrodeless fluorescent circuit for lamp as claimed in claim 7 is characterized in that,
Described lamp voltage sample annunciator comprises resistance and the electric capacity that is connected on the power take off;
Described lamp voltage sample annunciator comprises resistance and the electric capacity that is connected in parallel on the power take off.
9. electrodeless fluorescent circuit for lamp as claimed in claim 6 is characterized in that, described electrodeless fluorescent circuit for lamp also comprises:
Capacitance-resistance vibration timer is connected to central processing unit, and described capacitance-resistance vibration timer comprises electric capacity and resistance;
Protective circuit links to each other with described power take off and described central processing unit, and according to the current and voltage signals of described sample circuit collection, and the instruction of described central processing unit is protected circuit.
10. electrodeless fluorescent circuit for lamp as claimed in claim 6 is characterized in that, also comprises:
Anti-interference em filtering device links to each other with the input power supply;
Bridge rectifier links to each other with described anti-interference em filtering device, is also connected to described active power factor corrector;
The start-up control circuit links to each other with the input power supply, is also connected to electrodeless lamp.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810203395XA CN101415288B (en) | 2008-11-26 | 2008-11-26 | Light-adjusting circuit for electrodeless florescent lamp |
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| CN200810203395XA CN101415288B (en) | 2008-11-26 | 2008-11-26 | Light-adjusting circuit for electrodeless florescent lamp |
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| CN101415288A true CN101415288A (en) | 2009-04-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098854A (en) * | 2010-05-20 | 2011-06-15 | 冯林 | Dimming driving method and device and dimming lamp |
| CN104797065A (en) * | 2015-04-10 | 2015-07-22 | 浙江宇光照明科技有限公司 | Electrodeless lamp circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2305030Y (en) * | 1996-06-21 | 1999-01-20 | 李福文 | Electronic ballast for halogen lamp |
| CN201298956Y (en) * | 2008-11-26 | 2009-08-26 | 上海宏源照明电器有限公司 | Light modulation circuit of electrodeless fluorescent lamp |
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2008
- 2008-11-26 CN CN200810203395XA patent/CN101415288B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098854A (en) * | 2010-05-20 | 2011-06-15 | 冯林 | Dimming driving method and device and dimming lamp |
| WO2011143957A1 (en) * | 2010-05-20 | 2011-11-24 | Feng Lin | Dimming drive method, device and dimmable light |
| CN103052242A (en) * | 2010-05-20 | 2013-04-17 | 冯林 | Dimming lamp |
| CN103052241A (en) * | 2010-05-20 | 2013-04-17 | 冯林 | Dimming driving device |
| CN102098854B (en) * | 2010-05-20 | 2013-08-21 | 深圳市齐创美科技有限公司 | Dimming driving method |
| CN104797065A (en) * | 2015-04-10 | 2015-07-22 | 浙江宇光照明科技有限公司 | Electrodeless lamp circuit |
| CN104797065B (en) * | 2015-04-10 | 2018-05-01 | 浙江宇光照明科技有限公司 | A kind of nonpolar lamp circuit |
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| CN101415288B (en) | 2012-05-30 |
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Granted publication date: 20120530 Termination date: 20151126 |