CN102497713A - Electrodeless lamp dimming circuit and method - Google Patents
Electrodeless lamp dimming circuit and method Download PDFInfo
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- CN102497713A CN102497713A CN201110363803XA CN201110363803A CN102497713A CN 102497713 A CN102497713 A CN 102497713A CN 201110363803X A CN201110363803X A CN 201110363803XA CN 201110363803 A CN201110363803 A CN 201110363803A CN 102497713 A CN102497713 A CN 102497713A
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Abstract
The embodiment of the invention discloses an electrodeless lamp dimming circuit and method. The method comprises the following steps: an MCU (Microprogrammed Control Unit) is used for receiving the dimming signals sent by a dimming signal circuit; when the dimming signals indicate that the power of the electrodeless lamp needs to be adjusted to be smaller than a preset value, the MCU adjusts the work frequency of an LC inverter, and the power of the electrodeless lamp is reduced to be the preset value of the rated power of the electrodeless lamp, the adjustment of the LC inverter is stopped; and the MCU adjusts the output voltage of PFC (Power Factor Correction) so as to continue to reduce the power of the electrodeless lamp. By applying the diming circuit and method, not only is the diming range of the electrodeless lamp expanded, but also the accurate control on the dimming of the electrodeless lamp is realized.
Description
Technical field
The present invention relates to electrodeless lamp field, relate in particular to electrodeless lamp light adjusting circuit and light-dimming method.
Background technology
Electrodeless electromagnetic induction lamp abbreviates electrodeless lamp as; Its advantage comprises, the life-span of overlength, high light efficiency, high power factor, the output of light stable flux, high reliability, high-color rendering, low harmonic content, started quickly at low temperature, wide reference color temperature are arranged, instantaneously restarts, no stroboscopic and free from glare.Using electrodeless lamp can comprise for the benefit that the user brings, energy-efficient, reduce and to change the lamp cost, reduce maintenance cost etc. greatly, and electrodeless lamp is considered to one of the most promising light source in future.
The logic function figure of the formation of electroless lamp ballasting device is as shown in Figure 1; After the power-on, AC power is carried out rectification through input filter; With the result after the rectification through power factor correction (Power Factor Correction; PFC) circuit boosts and obtains high-voltage dc voltage, and this high-voltage dc voltage can be 400V, utilizes the HF switch conversion that this high pressure is carried out the inversion of DC to AC then; And utilize inductance capacitance (LC) resonance, produce ac high-voltage (can reach two or three kilovolt) and light electrodeless lamp.Electrodeless like this lamp participates in the work of circuit as a magnetic couplings element, gets into a stable status, luminous lighting.
Electrodeless lamp light modulation is a very attractive characteristic, and it can energy savings, and economic benefit is considerable.But the rectifier that the design light modulation is used is a complicacy and challenging work.The control signal of light modulation can be the induced signal of reflection surrounding environment, or according to the periodic signal of confirming service time, or some specific given signal.Such as, illumination of plant building, the cloudy day is different with fine natural daylight, can provide the Different control signal through inductor, city illumination, can provide the Different control signal midnight in front and back, directly provides control signal in addition, like the 1-10V dc control signal.
The relation of the power of electrodeless lamp and electrodeless lamp operating frequency is near the linear ratio relation, and modulating voltage approaches constant, so the power of lamp is by the electric current decision of lamp.Because the operating frequency of lamp by the ballast decision, so control the operating frequency of ballast, has also just been controlled the power of lamp.
In addition, the input voltage of ballast half-bridge inverter also can influence the output of lamp power, and under the same operating frequency, input voltage is low more, and power output is more little.
Therefore, at present electrodeless lamp light-dimming method is mainly contained two kinds: frequency modulation method and voltage regulating method, wherein
First: so-called frequency modulation method, as shown in Figure 2, turn down the input power of lamp exactly through the frequency that improves ballast inductor electric capacity (LC) inverter circuit; Thereby reach the purpose of light modulation. when the operating frequency of ballast improved, the ballast inductance of connecting with lamp (LR) induction reactance increased, and the resonant capacitance parallelly connected with lamp (CR) capacitive reactance diminishes; These 2 make that flowing through lamp tube current reduces, and the power of lamp descends thereupon, wherein LR; CR is a resonant inductance electric capacity, and CB is a capacitance.
If frequency modulation simply just, after frequency is heightened certain degree, lamp current less than rated value 60% (corresponding lamp power is about 60%; The data here all are based on the electrodeless lamp test gained of 300w, the lamp of different capacity, this value of the lamp of different manufacturers has difference) after; Because the discharge performance of lamp takes place sharply to change, and causes lamp current also very big with frequency change, frequency increases a bit a little; Lamp current just sharply reduces, and causes the lamp flicker or extinguishes, and is as shown in Figure 3; Therefore, frequency modulation rate merely just, light modulation in a big way.
Second: so-called voltage regulating method, keep the LC inverter operating frequency constant exactly, change the input voltage of LC inverter, for prime the ballast of PFC is arranged, this input voltage is exactly the HVDC BUS voltage of PFC output.Adjust the input power of lamp through the amplitude that changes this voltage, thereby reach the purpose of light modulation.The change of this direct voltage can realize through pulsewidth adjustment (Pulse Width Modulation PWM) method, and then change the input power of lamp.
For voltage regulating method; Because national standard is about the qualification of power factor, so actual ballast all has circuit of power factor correction, and many uses is the Boost topology; So the range of regulation of voltage regulating method also can only be at 342 volts to (220*110%*1.414=342V between the 415V; The electrochemical capacitor of 450V defines upper limit 450V, considers electric capacity life-span needs, generally is no more than 415V).Still the electrodeless lamp with a 300W is an example, and the ratio of the lamp power in this scope can only be reduced to about 84%, and is as shown in Figure 4, this shows, relying on pressure regulation merely also is light modulation in a big way.
Therefore, simple voltage regulating method and the frequency modulation method accurate control that all can not realize large-scale light modulation and power.
Summary of the invention
Electrodeless lamp light adjusting circuit and light-dimming method that the embodiment of the invention provided have solved the problem that can't realize accurately controlling electrodeless lamp power in the prior art on a large scale.
A kind of electrodeless lamp light adjusting circuit; Comprise: input filter; Power factor correction PFC master power circuit and inductance capacitance LC inverter circuit, wherein, the output of said input filter is connected with the input of said PFC master's power circuit; The output of said PFC master's power circuit is connected with the input of said LC inverter circuit; Said electrodeless lamp light adjusting circuit also comprises microcontroller MCU, regulator, frequency modulation device and dim signal circuit, and the input of said MCU is connected with the output of said dim signal circuit, and the output of said MCU is connected with the input of said regulator; The output of said regulator is connected with the input of said PFC master's power circuit; The output of said MCU is connected with the input of said frequency modulation device, and the output of said frequency modulation device is connected with the input of said LC inverter circuit, wherein:
Said MCU receives the dim signal that the dim signal circuit sends; When said dim signal indication need be adjusted to preset value when following with the power of electrodeless lamp; Indicate said frequency modulation device adjustment LC inverter operating frequency; After the power of said electrodeless lamp is reduced to preset value, stops to adjust said LC inverter operating frequency, and indicate the output voltage of said regulator adjustment PFC;
Said frequency modulation device receives the instruction of said MCU, adjusts said LC inverter operating frequency;
Said regulator receives the instruction of said MCU, adjusts the output voltage of said PFC.
A kind of electrodeless lamp light-dimming method comprises:
Microcontroller MCU receives the dim signal that the dim signal circuit sends;
When said dim signal indication need be adjusted to said rated power preset value when following with the power of electrodeless lamp; Said MCU adjustment inductance capacitance LC inverter operating frequency; After the power of said electrodeless lamp is reduced to the preset value of said electrodeless lamp rated power, stop to adjust said LC inverter;
Said MCU adjusts the output voltage of power factor correction PFC, continues to turn down the power of said electrodeless lamp.
Electrodeless lamp light adjusting circuit and light-dimming method that the embodiment of the invention provided have following beneficial effect:
1, than traditional voltage regulating method, realization that can be in a big way is to the control of electrodeless lamp power, and the Method and circuits that adopts the embodiment of the invention to provide can expand the dimming scope of electrodeless lamp to about 40 percent;
2, than traditional frequency modulation method, be reduced to preset value when following at electrodeless lamp power, still can carry out stable control to the power of electrodeless lamp, avoided out of control in this scope;
3, adopt MCU to control the dimming scope of electrodeless lamp, can realize digitized control, make more accurate the control of electrodeless lamp light modulation.
Description of drawings
Fig. 1 is an electroless lamp ballasting device structural representation;
Fig. 2 is the circuit diagram of LC inverter circuit in the electroless lamp ballasting device;
Fig. 3 is the graph of a relation of electrodeless lamp lamp power and LC inverter operating frequency;
Fig. 4 is the graph of a relation of electrodeless lamp lamp power and LC inverter input voltage;
Fig. 5 is first sketch map of electrodeless lamp light adjusting circuit;
Fig. 6 is second sketch map of electrodeless lamp light adjusting circuit;
Fig. 7 is the sketch map that concerns of electrodeless lamp power and frequency, input voltage.
Specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are carried out detailed description.
Embodiment 1
The embodiment of the invention provides a kind of electrodeless lamp light adjusting circuit; Comprise: input filter; Power factor correction PFC master power circuit and inductance capacitance LC inverter circuit, wherein, the output of said input filter is connected with the input of said PFC master's power circuit; The output of said PFC master's power circuit is connected with the input of said LC inverter circuit; Said electrodeless lamp light adjusting circuit also comprises microcontroller MCU, regulator, frequency modulation device and dim signal circuit, and the input of said MCU is connected with the output of said dim signal circuit, and the output of said MCU is connected with the input of said regulator; The output of said regulator is connected with the input of said PFC master's power circuit; The output of said MCU is connected with the input of said frequency modulation device, and the output of said frequency modulation device is connected with the input of said LC inverter circuit, wherein:
Said MCU receives the dim signal that the dim signal circuit sends; When said dim signal indication need be adjusted to preset value when following with the power of electrodeless lamp; Indicate said frequency modulation device adjustment LC inverter operating frequency; After the power of said electrodeless lamp is reduced to preset value, stops to adjust said LC inverter operating frequency, and indicate the output voltage of said regulator adjustment PFC;
Said frequency modulation device receives the instruction of said MCU, adjusts said LC inverter operating frequency;
Said regulator receives the instruction of said MCU, adjusts the output voltage of said PFC.In another one embodiment of the present invention, when said dim signal indication need be adjusted to the power of electrodeless lamp between its rated power preset value, said MCU adjusted the LC inverter operating frequency, adjusted the power of said electrodeless lamp.
In another one embodiment of the present invention; When said regulator is adjusted the output voltage of said PFC; Keep said LC inverter operating frequency constant; The power of said electrodeless lamp is reduced to a certain fixed value, and said then frequency modulation device slightly is reduced to the frequency of said LC inverter an other fixed value and remains unchanged the output voltage of the said PFC of said regulator continuation adjustment.
In another one embodiment of the present invention, said frequency modulation device comprises FM circuit and first control circuit, wherein:
Said FM circuit receives the instruction of said MCU, and through said first control circuit adjustment LC inverter circuit;
Said LC inverter circuit receives the instruction that said FM circuit sends through said first control circuit, and adjustment LC inverter operating frequency is adjusted the power of said electrodeless lamp.
In another one embodiment of the present invention, said frequency modulation device is integrated on the said MCU.
In another one embodiment of the present invention, said regulator comprises regulating circuit and second control circuit, wherein:
Said regulating circuit receives the instruction of said MCU, and adjusts said PFC master's power circuit through said second control circuit;
Said PFC master's power circuit receives the instruction that said regulating circuit sends through said second control circuit, and the output voltage of adjustment PFC is adjusted the power of said electrodeless lamp.
The embodiment of the invention also provides a kind of electrodeless lamp light-dimming method, comprising:
101, microcontroller MCU receives the dim signal that the dim signal circuit sends;
103, need the power of electrodeless lamp be adjusted to said rated power preset value when following when said dim signal indication; Said MCU adjustment inductance capacitance LC inverter operating frequency; After the power of said electrodeless lamp is reduced to the preset value of said electrodeless lamp rated power, stop to adjust said LC inverter;
105, said MCU adjusts the output voltage of power factor correction PFC, continues to turn down the power of said electrodeless lamp.
In another one embodiment of the present invention, said MCU adjusts the output voltage of power factor correction PFC, continues to turn down the power of said electrodeless lamp, comprising:
Keep said LC inverter operating frequency constant, adjust the output voltage of said PFC, the power of said electrodeless lamp is reduced to a certain fixed value;
Frequency with said LC inverter slightly is reduced to an other fixed value then, and remains unchanged, and continues the output voltage of the said PFC of adjustment.
In another one embodiment of the present invention; When said dim signal indication need be adjusted to the power of electrodeless lamp between the preset value of its rated power and said rated power; Said MCU adjusts the LC inverter operating frequency, adjusts the power of said electrodeless lamp.
In another one embodiment of the present invention, said MCU adjusts the LC inverter circuit through FM circuit, and then adjusts said LC inverter operating frequency; Perhaps
Said MCU directly adjusts the LC inverter circuit and adjusts said LC inverter operating frequency.
In another one embodiment of the present invention, said MCU adjusts PFC master's power circuit through regulating circuit, and then the output voltage of adjustment PFC.
In the above-described embodiments, said preset value can be provided with according to the size of electrodeless lamp power, so this preset value changes, and is not to be a fixed value, and the concrete way that is provided with can be:
1, confirms this preset value according to measuring; As when the operating frequency of LC inverter circuit is brought up to a certain value; Improve frequency again and will cause electrodeless lamp brightness sharply to descend, the pairing electrodeless lamp power value of operating frequency of this LC inverter circuit is this preset value at this moment; For example when electrodeless lamp power was 300W, preset value was 60 percent of a said electrodeless lamp rated power;
2, rule of thumb value is estimated, estimates this preset value;
3, also can be on 1 and 2 basis, and combine actual needs, determine a preset value.
In the above-described embodiments; When said regulator is adjusted the output voltage of said PFC, keep said LC inverter operating frequency constant, the power of said electrodeless lamp is reduced to a certain fixed value; Said then frequency modulation device slightly is reduced to an other fixed value with the frequency of said LC inverter and remains unchanged; Said regulator continues the output voltage of the said PFC of adjustment, wherein, and a said a certain fixed value and an other fixed value; Can confirm there is not fixed numeric values according to the difference and the empirical value of electrodeless lamp power.
Use electrodeless lamp light-dimming method and circuit that the embodiment of the invention provided; MCU turns down the brightness of electrodeless lamp through heightening the LC inverter operating frequency earlier; When brightness arrives 60 percent; Keep this LC inverter operating frequency constant, through turning down the output voltage of PFC, continue to turn down the brightness of electrodeless lamp again.Adopt this method not only can to adjust the brightness of electrodeless lamp accurately, and increase the dimming scope of electrodeless lamp through digital control.
Embodiment 2
Utilize a simple microcontroller (MCU) to obtain dim signal in the embodiment of the invention, and resolve this signal,, adjust the output voltage of PFC through regulating circuit then through FM circuit adjustment LC inverter operating frequency, as shown in Figure 5,
The embodiment of the invention provides a kind of electrodeless lamp light adjusting circuit; Comprise input filter, PFC master's power circuit, LC inverter circuit; MCU, FM circuit, first control circuit, regulating circuit, second control circuit and dim signal circuit; Wherein the input of MCU is connected with the output of dim signal circuit, and the output of MCU is connected with the input of FM circuit, and the another one output of MCU is connected with the input of regulating circuit; The output of this FM circuit is connected through the input of first control circuit with the LC inverter circuit; The output of this regulating circuit links to each other with the input of PFC master's power circuit through second control circuit, and the output of PFC master's power circuit is connected with the input of LC inverter circuit, and the input of PFC master's power circuit is connected with the output of input filter; Wherein:
MCU receives and resolves the dim signal that light adjusting circuit sends; When said dim signal indication need be adjusted to preset value when following with the power of electrodeless lamp; MCU indication FM circuit adjustment LC inverter operating frequency; After the power of said electrodeless lamp is reduced to preset value, stop to adjust said LC inverter operating frequency; After FM circuit received the instruction of MCU, through the operating frequency of first control circuit adjustment LC inverter circuit, when the power of electrodeless lamp was reduced to preset value, FM circuit quit work, and the LC inverter circuit keeps its operating frequency constant; The output voltage of MCU indication regulating circuit adjustment PFC after regulating circuit receives the instruction of MCU, through the voltage of second control circuit adjustment PFC master power circuit, is adjusted the brightness of electrodeless lamp through the PFC voltage that reduces the output of PFC master's power circuit.
In another one embodiment of the present invention; When said dim signal indication need be adjusted electrodeless lamp between its rated power and preset value; Said MCU output command is given FM circuit; Get final product through FM circuit adjustment LC inverter operating frequency, adjust the power of said electrodeless lamp through adjustment LC inverter operating frequency.
Embodiment 3
Receive the MCU of dim signal, control the LC inverter simultaneously, after this MCU receives and resolves this dim signal, directly control the LC inverter circuit, send PFC pressure regulation signal simultaneously, through the output voltage of regulating circuit adjustment PFC, as shown in Figure 6:
The embodiment of the invention provides a kind of electrodeless lamp light adjusting circuit, comprises input filter, PFC master's power circuit; The LC inverter circuit, MCU, regulating circuit, second control circuit and dim signal circuit; Wherein, The input of MCU is connected with the output of dim signal circuit, and the output of MCU is connected with the input of LC inverter circuit, and the another one output of MCU is connected with the input of regulating circuit; The output of this regulating circuit links to each other with the input of PFC master's power circuit through second control circuit; The output of PFC master's power circuit is connected with the input of LC inverter circuit, and the input of PFC master's power circuit is connected with the output of input filter, wherein:
MCU receives and resolves dim signal; When said dim signal indication need be adjusted to preset value when following with the power of electrodeless lamp; MCU directly adjusts the LC inverter operating frequency, the power of said electrodeless lamp is reduced to preset value after, stop to adjust said LC inverter operating frequency; When the power of electrodeless lamp was reduced to preset value, MCU stopped to adjust the operating frequency of LC inverter circuit, and the LC inverter circuit keeps its operating frequency constant; The output voltage of MCU indication regulating circuit adjustment PFC after regulating circuit receives the instruction of MCU, through the voltage of second control circuit adjustment PFC master power circuit, is adjusted the brightness of electrodeless lamp through the PFC voltage that reduces the output of PFC master's power circuit.
In another one embodiment of the present invention; When said dim signal indication need be adjusted electrodeless lamp between its rated power and preset value; Said MCU directly adjusts the LC inverter operating frequency and gets final product, and adjusts the power of said electrodeless lamp through adjustment LC inverter operating frequency.
When preset value be electrodeless lamp rated power 60 percent the time, it is best to use the effect that light-dimming method and light adjusting circuit in the foregoing description carry out light modulation.
In the foregoing description 1 to 3, can utilize frequency modulation method earlier, promptly MCU is through the operating frequency of adjustment LC inverter circuit; Reduce the power of electrodeless lamp, after lamp power drops to 60%, keep the operating frequency of LC inverter circuit constant; MCU turns down the input voltage of LC inverter through the output voltage of adjustment PFC, reduces the power of electrodeless lamp, when the power of electrodeless lamp is reduced to a certain suitable value (in the present embodiment; The power of electrodeless lamp is 300W, and this suitable value is 50% of an electrodeless lamp power, and this numerical value of the lamp of different capacity can be variant) operating frequency of LC inverter circuit is improved be reduced to another fixed value (in the present embodiment; Can reduce several Khz, this numerical value of the lamp of different capacity also can be different), the operating frequency with this LC inverter circuit remains unchanged then; Continue to turn down input voltage simultaneously, as shown in Figure 7.Adopt above-mentioned mode of operation, can be in the light modulation process of electrodeless lamp, avoid the power of electrodeless lamp to drop to 60% when following, brightness sharply descends, the problem that can't rationally control.Adopt above-mentioned method,, still can control easily when the brightness of electrodeless lamp drops to 60% when following, during any numerical value of the brightness of especially electrodeless lamp between 40%-60%, can be stable control, as shown in table 1 below:
Table 1
| Switching frequency (kHz) | ?Vbus(V) | Po(W) | Export ratio |
| 249.4 | ?410 | 297.5 | 100.0％ |
| 264.3 | ?410 | 279.3 | 93.9％ |
| 283.6 | ?410 | 263 | 88.4％ |
| 314.5 | ?410 | 215 | 72.3％ |
| 329.5 | ?410 | 175.1 | 58.9％ |
| 329.5 | ?400 | 162.23 | 54.5％ |
| 329.5 | ?390 | 152.54 | 51.3％ |
| 326.4 | ?370 | 147.8 | 49.7％ |
| 326.4 | ?360 | 132.44 | 44.5％ |
| 326.4 | ?348 | 118.56 | 39.9％ |
More than be some preferred implementation of the embodiment of the invention; Anyone is under the prerequisite of skilled; Do not deviating from spirit of the present invention and do not exceeding under the prerequisite of the technical scope that the present invention relates to, can do various replenishing and modification the details that the present invention describes.Protection scope of the present invention is not limited to the cited scope of embodiment, and protection scope of the present invention is as the criterion with claim.
Claims (10)
1. electrodeless lamp light adjusting circuit; Comprise: input filter, power factor correction PFC master power circuit and inductance capacitance LC inverter circuit, wherein; The output of said input filter is connected with the input of said PFC master's power circuit; The output of said PFC master's power circuit is connected with the input of said LC inverter circuit, it is characterized in that, said electrodeless lamp light adjusting circuit also comprises microcontroller MCU, regulator, frequency modulation device and dim signal circuit; The input of said MCU is connected with the output of said dim signal circuit; The output of said MCU is connected with the input of said regulator, and the output of said regulator is connected with the input of said PFC master's power circuit, and the output of said MCU is connected with the input of said frequency modulation device; The output of said frequency modulation device is connected with the input of said LC inverter circuit, wherein:
Said MCU receives the dim signal that said dim signal circuit sends; When said dim signal indication need be adjusted to preset value when following with the power of electrodeless lamp; Indicate said frequency modulation device adjustment LC inverter operating frequency; After the power of said electrodeless lamp is reduced to preset value, stops to adjust said LC inverter operating frequency, and indicate the output voltage of said regulator adjustment PFC;
Said frequency modulation device receives the instruction of said MCU, adjusts said LC inverter operating frequency;
Said regulator receives the instruction of said MCU, adjusts the output voltage of said PFC.
2. circuit as claimed in claim 1 is characterized in that, when said electrodeless lamp power is 300 watt-hours, said preset value is 60 percent of a said electrodeless lamp rated power.
3. circuit as claimed in claim 1; It is characterized in that; When said regulator is adjusted the output voltage of said PFC, keep said LC inverter operating frequency constant, the power of said electrodeless lamp is reduced to a certain fixed value; Said then frequency modulation device slightly is reduced to the frequency of said LC inverter an other fixed value and remains unchanged the output voltage of the said PFC of said regulator continuation adjustment.
4. like the arbitrary described circuit of claim 1 to 3, it is characterized in that said frequency modulation device is integrated on the said MCU; Perhaps
Said frequency modulation device comprises FM circuit and first control circuit, wherein:
Said FM circuit receives the instruction of said MCU, and through said first control circuit adjustment LC inverter circuit;
Said LC inverter circuit receives the instruction that said FM circuit sends through said first control circuit, and adjustment LC inverter operating frequency is adjusted the power of said electrodeless lamp.
5. like the arbitrary described circuit of claim 1 to 3, it is characterized in that said regulator comprises regulating circuit and second control circuit, wherein:
Said regulating circuit receives the instruction of said MCU, and adjusts said PFC master's power circuit through said second control circuit;
Said PFC master's power circuit receives the instruction that said regulating circuit sends through said second control circuit, and the output voltage of adjustment PFC is adjusted the power of said electrodeless lamp.
6. an electrodeless lamp light-dimming method is characterized in that, comprising:
Microcontroller MCU receives the dim signal that the dim signal circuit sends;
When said dim signal indication need be adjusted to preset value when following with the power of electrodeless lamp; Said MCU adjustment inductance capacitance LC inverter operating frequency; After the power of said electrodeless lamp is reduced to the preset value of said electrodeless lamp rated power, stop to adjust said LC inverter operating frequency;
Said MCU adjusts the output voltage of power factor correction PFC, continues to turn down the power of said electrodeless lamp.
7. method as claimed in claim 6 is characterized in that, said MCU adjusts the output voltage of power factor correction PFC, continues to turn down the power of said electrodeless lamp, comprising:
Keep said LC inverter operating frequency constant, adjust the output voltage of said PFC, the power of said electrodeless lamp is reduced to a certain fixed value;
Frequency with said LC inverter slightly is reduced to an other fixed value then, and remains unchanged, and continues the output voltage of the said PFC of adjustment, and then turns down the power of said electrodeless lamp.
8. method as claimed in claim 6 is characterized in that, when said electrodeless lamp power is 300 watt-hours, said preset value is 60 percent of a said electrodeless lamp rated power.
9. like the arbitrary described method of claim 6 to 8, it is characterized in that said MCU adjustment inductance capacitance LC inverter operating frequency comprises:
Said MCU adjusts the LC inverter circuit through FM circuit, and then adjusts said LC inverter operating frequency; Perhaps
Said MCU directly adjusts the LC inverter circuit and adjusts said LC inverter operating frequency.
10. like the arbitrary described method of claim 6 to 8, it is characterized in that the output voltage of said MCU adjustment power factor correction PFC comprises:
Said MCU adjusts PFC master's power circuit through regulating circuit, and then the output voltage of adjustment PFC.
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| CN103228092A (en) * | 2013-05-08 | 2013-07-31 | 上海宏源照明电器有限公司 | Independent frequency output circuit capable of inhibiting electromagnetic wave interference of electrodeless lamp and modulation method |
| JP2014023366A (en) * | 2012-07-23 | 2014-02-03 | Ebara Corp | Pump apparatus with input current value arithmetic function |
| CN103945622A (en) * | 2014-03-04 | 2014-07-23 | 中达电通股份有限公司 | Protection and control method of centralized power supply high-voltage direct-current LED (light-emitting diode) street lamp system |
| TWI458394B (en) * | 2012-10-15 | 2014-10-21 | ||
| CN107645805A (en) * | 2017-09-23 | 2018-01-30 | 苏州思创源博电子科技有限公司 | A kind of LED high effective controlling lights control method |
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| CN102238792A (en) * | 2010-11-10 | 2011-11-09 | 福建睿能电子有限公司 | Electronic ballast for high pressure gas discharge lamp |
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