CN101951723A - Frequency-shaking ballast resistor for electrode-less lamp - Google Patents
Frequency-shaking ballast resistor for electrode-less lamp Download PDFInfo
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- CN101951723A CN101951723A CN2010102814472A CN201010281447A CN101951723A CN 101951723 A CN101951723 A CN 101951723A CN 2010102814472 A CN2010102814472 A CN 2010102814472A CN 201010281447 A CN201010281447 A CN 201010281447A CN 101951723 A CN101951723 A CN 101951723A
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Abstract
The invention discloses a ballast resistor for an electrode-less lamp, which comprises an EMI filter, a rectification circuit, a PFC (power factor correcting circuit) and a DC/AC resonance inverter circuit. The switch frequency of the ballast resistor periodically changes from 230 plus/minus 30 kHz or 250 plus/minus 50 kHz. Through shaking the frequency, the energy can be distributed in the frequency band nearby the frequency and the harmonic wave thereof, so under the condition of maintaining the whole energy, the energy at each place in the frequency band is smaller than the original energy, the radiating energy is reduced, the value detected by the test device is smaller than the original value, the specified limit value is easily achieved and the EMI test demand is met.
Description
Technical field
The present invention relates to electrodeless electromagnetic induction lamp, particularly relate to the frequency circuit of trembling of electrodeless electromagnetic induction lamp ballast.
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 electroless lamp ballasting device is different from common Switching Power Supply, also is different from common fluorescent lamp ballast.It is output as the high-frequency and high-voltage alternating current.In addition, electrodeless lamp also is different from common fluorescent lamp.Plasma discharge in the electrodeless lamp needs the discharge electric field intensity of a minimum, this electric field strength is directly proportional with the flux change rate, the flux change rate is relevant with the operating frequency of electric ballast again, for the operating frequency of the electrodeless lamp electronic ballast that meets the demands can not be too low, generally about 230Khz or 250Khz; And electrodeless lamp load is more special, it is the structure of a ring-type, when in the fluorescent tube when the alternating current, can become a loop aerial to external radiation, so a lot of electrodeless lamp electronic ballasts of Frequency point are being done the EMI(electromagnetic interference hereto) be not easy during test up to standard.Also have a disadvantageous especially place to be, the magnet ring of electrodeless lamp is wound with a lot of circle coils, if launch, total total several meters long, the AC signal of 230Khz or 250Khz is worked on so long line, the energy of radiation is very big, for by the EMI standard, just must take strong braking measure can reach the relevant detection standard.
Summary of the invention
When technical problem to be solved by this invention is to solve the work of electrodeless lamp emittance big, be difficult for by the detection problem.
Technical scheme of the present invention is: allow the switching frequency of electroless lamp ballasting device become around 230 ± 30kHz or 250 ± 50kHz cycle of carrying out from the former 230Khz that fixes or 250Khz and change, that just often says trembles frequency.So just the spectrum energy at original 230Khz or 250Khz place can be distributed in the scope of a broad, make whole lamp system can easily reach the requirement of EMI standard.
The setting of described adjustment control chip, the switching frequency that makes ballast changes around 230 ± 30kHz or 250 ± 50kHz cycle of carrying out and is meant that control chip RT pin inserts the first resistance R t, the CT pin inserts the first capacitor C t, this capacitor C t ground connection, the first resistance R t is connected with the first capacitor C t, tie point inserts the second resistance R j, and the second resistance R j other end inserts low frequency signal Vj.
The setting of the whole control chip of described key, the switching frequency that makes ballast changes around 230 ± 30kHz or 250 ± 50kHz cycle of carrying out and is meant that control chip RT pin inserts the first resistance R t, this resistance R t ground connection, the CT pin inserts the first capacitor C t, this capacitor C t ground connection, the RT pin inserts the second resistance R j again, and the second resistance R j other end inserts low frequency signal Vj.
By electronic circuit software, the switching frequency of ballast is changed around 230 ± 30kHz or 250 ± 50kHz cycle of carrying out.
This beneficial effect of the invention is: by trembling frequently, with this Energy distribution in the certain frequency band of this frequency and harmonic wave annex thereof, like this under the constant prerequisite of gross energy, the energy of the everywhere in the frequency band all can be less than original energy, emittance reduces, the value that is checked through of testing equipment reaches the limit value of standard code easily, thereby satisfies the EMI test request just less than original value like this.
Description of drawings
Fig. 1 is that ballast switching frequency of the present invention changes schematic diagram.
Fig. 2 adopts to tremble front and back spectral change schematic diagram frequently.
Fig. 3 is the circuit diagram of a kind of embodiment of the present invention.
Fig. 4 is the low frequency signal schematic diagram that is superposeed in Fig. 3 circuit diagram.
Fig. 5 is the circuit diagram of a kind of embodiment of the present invention.
Embodiment
Following execution mode is used for illustrating the present invention, but is not used for limiting the scope of the invention.
Fig. 1 is that ballast switching frequency of the present invention changes schematic diagram, and among Fig. 1, Fmin＜Fmid＜Fmax, Fmid are original reference frequency, and T_dither adjusts signal or trembles the cycle that changes frequently, T_dither〉〉 1/Fmid.
Spectral change before and after Fig. 2 represents to tremble frequently.Provided the spectrum energy signal of first-harmonic among the figure, the frequency spectrum of corresponding each harmonic is similar.The control chip of the overwhelming majority, be PWM(Pulse Width Modulation) control mode or PFM(Pulse FrequencyModulation) all can adopt mode to the timing capacitor charge and discharge to obtain sawtooth waveforms or triangular wave carries out corresponding algorithm then, obtain final switching frequency.
Embodiment 1
Trembling the basic implementation method that realizes frequently is exactly the electric current of managing to change to the timing capacitor charge and discharge, discharges and recharges the time thereby change timing capacitor, has also just changed switching frequency.A kind of implementation as shown in Figure 3, control chip RT pin inserts the first resistance R t, the CT pin inserts the first capacitor C t, this capacitor C t ground connection, the first resistance R t is connected with the first capacitor C t, tie point inserts the second resistance R j, and the second resistance R j other end inserts low frequency signal Vj, a kind of form of expression such as Fig. 4 of this low frequency signal.It is received on the CT pin by resistance R j, has so just periodically changed to give capacitor C T the electric current of charging, makes the shake of the operating switch frequency period that originally fixes.
Embodiment 2
Shown in Figure 5ly provided another kind of realization example, its adopts the principle identical with embodiment 1, control chip RT pin inserts the first resistance R t, this resistance R t ground connection, and the CT pin inserts the first capacitor C t, this capacitor C t ground connection, the RT pin inserts the second resistance R j again, and the second resistance R j other end inserts low frequency signal Vj, a kind of form of expression such as Fig. 4 of this low frequency signal, it will be adjusted signal and be added to frequency and determine resistance R T place, give the regularly electric current of electric capacity charging thereby changed.
Above said content only is the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (4)
1. an electroless lamp ballasting device comprises Electromagnetic interference filter, rectification circuit, and circuit of power factor correction, DC/AC resonance inversion circuit is characterized in that: the switching frequency of ballast changes around 230 ± 30kHz or 250 ± 50kHz cycle of carrying out.
2. a kind of electroless lamp ballasting device according to claim 1, it is characterized in that: the switching frequency of described ballast changes around 230 ± 30kHz or 250 ± 50kHz cycle of carrying out, the RT pin that is meant at control chip inserts first resistance (Rt), the CT pin inserts first electric capacity (Ct), this electric capacity (Ct) ground connection, first resistance (Rt) is connected with first electric capacity (Ct), and tie point inserts second resistance (Rj), and the second resistance other end inserts the low frequency signal (Vj) that changes.
3. a kind of electroless lamp ballasting device according to claim 2, it is characterized in that: the setting of the whole control chip of described key, the switching frequency that makes ballast changes around 230 ± 30kHz or 250 ± 50kHz cycle of carrying out and is meant that control chip RT pin inserts first resistance (Rt), this grounding through resistance, the CT pin inserts first electric capacity (Ct), this electric capacity (Ct) ground connection, the RT pin inserts second resistance (Rj) again, and second resistance (Rj) other end inserts the low frequency signal (Vj) that changes.
4. according to any one described a kind of electroless lamp ballasting device of claim 1～3, it is characterized in that:, the switching frequency of ballast is changed around 230 ± 30kHz or 250 ± 50kHz cycle of carrying out by electronic circuit software.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102814472A CN101951723A (en) | 2010-09-15 | 2010-09-15 | Frequency-shaking ballast resistor for electrode-less lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102814472A CN101951723A (en) | 2010-09-15 | 2010-09-15 | Frequency-shaking ballast resistor for electrode-less lamp |
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| Publication Number | Publication Date |
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| CN101951723A true CN101951723A (en) | 2011-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102814472A Pending CN101951723A (en) | 2010-09-15 | 2010-09-15 | Frequency-shaking ballast resistor for electrode-less lamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482898A (en) * | 2017-08-16 | 2017-12-15 | 广东美的制冷设备有限公司 | Pfc circuit trembles frequency control method, device and readable storage medium storing program for executing |
| CN107517000A (en) * | 2017-08-22 | 2017-12-26 | 广东美的制冷设备有限公司 | Power circuit switching signal trembles frequency control method, device and readable storage medium storing program for executing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201509357U (en) * | 2009-09-24 | 2010-06-16 | 合肥三川自控工程有限责任公司 | Electrode-less lamp microwave dimming amperite |
-
2010
- 2010-09-15 CN CN2010102814472A patent/CN101951723A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201509357U (en) * | 2009-09-24 | 2010-06-16 | 合肥三川自控工程有限责任公司 | Electrode-less lamp microwave dimming amperite |
Non-Patent Citations (2)
| Title |
|---|
| 《电源技术应用》 20060531 李建婷等 抖频--有效降低开关电源EMI噪声容限的技术 第40-41页 1-4 第9卷, 第5期 * |
| 李建婷等: "抖频——有效降低开关电源EMI噪声容限的技术", 《电源技术应用》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482898A (en) * | 2017-08-16 | 2017-12-15 | 广东美的制冷设备有限公司 | Pfc circuit trembles frequency control method, device and readable storage medium storing program for executing |
| CN107517000A (en) * | 2017-08-22 | 2017-12-26 | 广东美的制冷设备有限公司 | Power circuit switching signal trembles frequency control method, device and readable storage medium storing program for executing |
| CN107517000B (en) * | 2017-08-22 | 2020-02-11 | 广东美的制冷设备有限公司 | Method and device for controlling frequency jitter of switching signal of power circuit and readable storage medium |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20110119 |