TWI239378B - Power factor correcting circuit for electronic ballast - Google Patents
Power factor correcting circuit for electronic ballast Download PDFInfo
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- TWI239378B TWI239378B TW93106509A TW93106509A TWI239378B TW I239378 B TWI239378 B TW I239378B TW 93106509 A TW93106509 A TW 93106509A TW 93106509 A TW93106509 A TW 93106509A TW I239378 B TWI239378 B TW I239378B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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定 交流盪,路發 穩定為交震示電而b 波安換將頻所波6彡 光子轉是高圖濾1 1, 與電流器用一流路C 、的直定,第直電器 電知由安壓如、管容 省習再子電。ο燈電 、一、電的燈1動一。 輕。流的流光路驅含點 量流直知直曰電後包優 重主為習將亮流最僅等 、 之換,再點整,2單 小器轉說,後式4 1簡 積定流的壓然橋1路路 體安交確電,括路電電 為燈串明的壓包電波與 因光連更流高器盪濾宜 器日一 ,直流定振流便 1定是是合為交安頻直錢 術安已上組換頻子高,價 技子,本路轉高電與中有 前電素基電電成之、其具 先因,之市變知2。 法 t 等器流的逆習1光做 1239378 五、發明說明(1) 【發明所屬之技術領域】 本發明係有關於一種高效率之日光燈電子安定器,或 者更明確的說,係有關於一種用於日光燈電子安定器之功 率因數修正電路。 輸入之交流電壓V s經橋.式整流電路1 0整流,再經電 容器C 1之充放電,而在電容器C 1兩端形成具有漣波之直 流電壓。因為交流電壓V s只有在其波峰或波谷附近,才 有夠大的電壓,經橋式整流電路1 0對電容器C 1充電,因 此,輸入之交流電流會呈脈衝的波形。一般為減低該直流 電壓的漣波(亦即提高濾波的效果),會選擇有較大電容 量之電容器C 1,但這樣會使得輸入交流電流脈衝更形尖When the AC voltage is constant, the road is stable for the oscillating display, and the b-wave converter changes the frequency of the wave 6 彡 photon to the high-resolution filter 1 1, and the current device uses the first-order circuit C, and the direct current is determined by Pressure such as, tube capacity to save Zaizi electricity. ο Lamp electric, one, electric lamp 1 moves one. light. The streamer of the streamer drive has a small amount of flow. It ’s straightforward to know that after the electricity package, the main priority is to wait for Xi Liangliang to change, and then reorder, 2 single small devices, the following formula 4 Of course, the road body of the bridge 1 is safe and secure. The electric power including the bundled electric waves of the string lights and the high-frequency filter oscillating filter due to the optical connection is the first day. The frequency of direct money technology has been changed in the group of high frequency, high price, this way to high electricity and the former electric element-based electricity into electricity, its a priori, the market changes know 2. The inverse practice of method t equalizer flow 1 light do 1239378 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a high-efficiency fluorescent lamp electronic ballast, or more specifically, to a Power factor correction circuit for electronic ballasts for fluorescent lamps. The input AC voltage V s is rectified by the bridge-type rectifier circuit 10 and then charged and discharged by the capacitor C 1 to form a DC voltage with ripples across the capacitor C 1. Because the AC voltage V s only has a sufficiently large voltage near its peak or valley, the capacitor C 1 is charged by the bridge rectifier circuit 10, so the input AC current will have a pulse waveform. Generally, in order to reduce the ripple of the DC voltage (that is, to improve the filtering effect), a capacitor C 1 with a larger capacitance is selected, but this will make the input AC current pulse sharper.
第5頁 1239378 五、發明說明(2) 銳。Page 5 1239378 V. Description of the invention (2) Sharp.
第二圖係習知之電子安定器之輸入交流電壓V s與交流 電流I s之波形圖。如第二圖所示,輸入交流電流I s係有嚴 重失真的尖銳脈衝,造成諧波含量(特別是第三次諧波含 量)提高與功率因數降低。諧波含量的提高,會增加電磁 的干擾,如果大量使用此種電子安定器,可能會引起供電 系統的跳閘(燒毁保險絲),更嚴重的情況可能會導致火 災的發生。而功率因數的降低,增加了供電系統的功率消 耗,使得用電費用增加。The second figure is a waveform diagram of the input AC voltage V s and the AC current I s of the conventional electronic ballast. As shown in the second figure, the input AC current I s is a sharp pulse with severe distortion, which results in an increase in the harmonic content (especially the third harmonic content) and a decrease in the power factor. The increase of harmonic content will increase electromagnetic interference. If a large number of such electronic ballasts are used, the power supply system may trip (burn out the fuse), and more serious situations may lead to fires. The reduction of the power factor increases the power consumption of the power supply system and increases the cost of electricity.
如果降低電容器C 1的電容量,此舉固然可以降低輸 入交流電流I s的失真,減少其諧波含量,同時提高其功率 因數,但是電容器C 1兩端形成的直流電壓,其漣波波動 幅度會增加,這又會造成燈管電流的波峰因數(電流峰值 對有效值的比值)變大超過燈管的額定值,因而減少燈管 的壽命。燈管壽命測試的標準一般是在燈管電流波峰因數 為1. 7或以下的條件下測出的,。由上所述可知,降低輸入 電流諧波與提高功率因數,和降低燈管電流波峰因數,兩 者對習知的電子安定器其實是相互抵觸。 目前市售所謂高效率電子安定器,絕大多數所產生的 總諧波失真-1 0 %、功率因數与0. 5 0、燈管電流波峰因數 -1. 7,其諧波含量甚高而功率因數甚低,因此,其高效If the capacitance of capacitor C 1 is reduced, this will certainly reduce the distortion of the input AC current I s, reduce its harmonic content, and increase its power factor, but the DC voltage formed across capacitor C 1 will have a ripple amplitude. It will increase, which in turn will cause the crest factor (ratio of the current peak value to the effective value) of the lamp current to exceed the rated value of the lamp, thereby reducing the life of the lamp. The lamp life test standard is generally measured under the condition that the lamp current crest factor is 1.7 or less. It can be seen from the above that reducing the input current harmonics and increasing the power factor, and reducing the lamp current crest factor, the two are actually in conflict with the conventional electronic ballast. The so-called high-efficiency electronic ballasts currently on the market, the vast majority of the total harmonic distortion -10%, power factor and 0.50, lamp current crest factor -1.7, its harmonic content is very high and The power factor is very low, so it is highly efficient
第6頁 1239378 五、發明說明(3) 率其實係指點燈的高頻高效率而言。而要實際達到真正的 高效率,電子安定器中勢必要增加一些電路以解決上述的 問題。 目前一般電子安定器降低輸入交流電流諧波含量以及 提高功率因數的方案,主要係採主動式或被動式兩種功率 因數修正電路。主動式功率因數修正電路係採用主動元 件,因此結構複雜、體積大、且成本高。而習知的被動式 功率因數修正電路改良效果不佳,難以實用。Page 6 1239378 V. Description of the invention (3) The rate actually refers to the high frequency and high efficiency of the lighting. To achieve real high efficiency, it is necessary to add some circuits in the electronic ballast to solve the above problems. At present, the general electronic ballasts reduce the input AC current harmonic content and increase the power factor. The scheme mainly adopts active or passive power factor correction circuits. The active power factor correction circuit uses active components, so the structure is complex, bulky, and costly. However, the conventional passive power factor correction circuit has a poor improvement effect and is difficult to be practical.
【發明内容】 《所欲解決之技術問題》 ; 習知之電子安定裔的輸入父流電流的失真,造成電流 諧波含量(特別是第三次諧波含量)提高與功率因數降 低。譜波含量的提高,會增加電磁的干擾,如果大量使用 此種電子安定器,可能會引起供電系統的跳閘(燒毀保險 絲),更嚴重的情況可能會導致火災的發生。而功率因數 的降低,增加了供電系統的功率消耗,使得用電費用增 加。[Summary of the Invention] "The technical problem to be solved"; The distortion of the input current of the current electronic stabilizer, which causes the current harmonic content (especially the third harmonic content) to increase and the power factor to decrease. Increasing the content of spectral waves will increase electromagnetic interference. If this type of electronic ballast is used in large quantities, it may cause tripping of the power supply system (burning the fuse), and more serious conditions may cause fires. The reduction of the power factor increases the power consumption of the power supply system and increases the cost of electricity.
另外,習知的被動式功率因數修正電路,改良效果不 佳,輸入電流諧波含量仍高,可靠性低、燈管電流波峰因 數高,造成燈管壽命減少等,難以實用。In addition, the conventional passive power factor correction circuit has a poor improvement effect, the input current harmonic content is still high, the reliability is low, the lamp current crest factor is high, and the lamp life is reduced, which is difficult to be practical.
第7頁 1239378 五、發明說明(4) 《解決問題之技術手段》Page 7 1239378 V. Description of the invention (4) "Technical means to solve the problem"
本發明係在習知的電子安定器之橋式整流電路與高頻 振盪電路之間,以複數個二極體與電容器構成一功率因數 修正電路,取代習知的單電容器濾波電路。此功率因數修 正電路包含一濾波電容充放電路與一由燈管燈絲回授之反 饋電路,前者使電源電壓對其充電時的等效電容量降低, 使得輸入交流電流波形較為平緩,諧波含量降低,而前者 又對負載放電時,使其等效電容量提高,增大放電時間常 數,使直流電壓漣波幅度減少,這也就降低了供給燈管電 流的波動幅度,使其波峰因數下降。而後者進一步將高頻 電壓疊加在該整流電路輸出之低頻直流電壓上,使得輸入 交流電流波形更趨近於正弦波。 《對先前技術之功效》 本發明的功率因數修正電路能實現輸入交流電流諧波 含量低(總諧波失真< 1 0 %)、高功率因數(功率因數>The invention relates to a conventional electronic ballast bridge rectifier circuit and a high-frequency oscillation circuit. A plurality of diodes and a capacitor form a power factor correction circuit, replacing the conventional single capacitor filter circuit. This power factor correction circuit includes a filter capacitor charging and discharging circuit and a feedback circuit fed back from the lamp filament. The former reduces the equivalent capacitance of the power supply voltage when charging it, making the input AC current waveform smoother and the harmonic content. When the former is discharged to the load, the equivalent capacitance is increased, the discharge time constant is increased, and the amplitude of the DC voltage ripple is reduced. This also reduces the fluctuation of the current supplied to the lamp and reduces its crest factor. . The latter further superimposes the high-frequency voltage on the low-frequency DC voltage output by the rectifier circuit, making the input AC current waveform closer to a sine wave. "Effects of the prior art" The power factor correction circuit of the present invention can achieve low harmonic content of input AC current (total harmonic distortion < 10%), high power factor (power factor)
0. 9 5)、燈管電流波峰因數低於額定值(燈管電流波峰因 數< 1. 7)的需求,還具有體^積小、成本低、工作可靠性 高、特別適合用在中小型功率的自激式電子安定器等特 點。 本發明的目的、特色與優點,可藉由下文之詳細說明 與所附圖示而得到進一步了解,理應瞭解的是,前述的一 般說明、下文的詳細說明與所附圖示,係屬範例性和解釋0. 9 5), the lamp current crest factor is lower than the rated value (lamp current crest factor < 1. 7), it also has a small volume, low cost, high working reliability, especially suitable for use in Small and medium power self-excited electronic ballasts. The object, features and advantages of the present invention can be further understood through the following detailed description and accompanying drawings. It should be understood that the foregoing general description, the following detailed description and the accompanying drawings are exemplary. And explain
第8頁 1239378 五、發明說明(5) 性,其意在提供本發明的進一步解釋,而非意在對本發明 有任何額外的限制。 【實施方式】 為能詳細說明本發明的目的、特徵、與功效,茲藉由 下述較佳之實施例,配合所附圖式,對本發明做詳細說 明。 本發明的功率因數修正電路是架構在習知的電子安定 器電路上,且與其合併在一起運作。 第三圖係依據本發明一較佳實施例之電子安定器電路 圖。如第三圖所示,其中,橋式整流電路1 0 、高頻振盪 電路1 4 、與燈管電路1 6均為習知的電子安定器電路。 功率因數修正電路包含一濾波電容充放電路與一反饋電 路。以下先說明濾波電容充放電路。 濾波電容充放電路包含二極體D 1〜D 5、與濾波電容 器C 1、C 2 。橋式整流電路1 0正端的輸出,與一整流 二極體D 5順向連接至一 B點,在此B點與橋式整流電路 1 0負端的輸出C點之間,濾波電容器C 1與二極體D 4以 串聯方式連接,其中,二極體D 4係以負向連接的方式, 由其陽極與C點連接。同時在B點與橋式整流電路1 0負 端的輸出C點之間,二極體D 3與濾波電容器C 2以串聯方Page 8 1239378 V. Description of the Invention (5) It is intended to provide a further explanation of the invention, and is not intended to impose any additional restrictions on the invention. [Embodiment] In order to explain the object, features, and effects of the present invention in detail, the present invention will be described in detail with reference to the following preferred embodiments and the accompanying drawings. The power factor correction circuit of the present invention is built on a conventional electronic ballast circuit and operates in combination with it. The third figure is a circuit diagram of an electronic ballast according to a preferred embodiment of the present invention. As shown in the third figure, the bridge rectifier circuit 10, the high-frequency oscillation circuit 14 and the lamp tube circuit 16 are all conventional electronic ballast circuits. The power factor correction circuit includes a filter capacitor charging and discharging circuit and a feedback circuit. The following describes the filter capacitor charging and discharging circuit. The filter capacitor charging / discharging circuit includes diodes D 1 to D 5 and filter capacitors C 1 and C 2. The output of the positive terminal of the bridge rectifier circuit 10 and a rectifying diode D 5 are connected in a forward direction to a point B. Between this point B and the output point C of the negative terminal of the bridge rectifier circuit 10, the filter capacitor C 1 and The diode D 4 is connected in series, and the diode D 4 is connected in a negative direction by its anode and point C. At the same time, between point B and the output C of the negative terminal 10 of the bridge rectifier circuit, the diode D 3 and the filter capacitor C 2 are connected in series.
第9頁 1239378 五、發明說明(6) 式連接,其中,二極體D 3係以負向連接的方式,由其陰 極與B點連接。在濾波電容器C 1與二極體D 4的連接點, 以及二極體D 3與濾波電容器C 2的連接點之間,二極體D 1、D 2以串聯的方式順向連接,其中二極體D 4的陰極與 二極體D1的陽極連接,二極體D 2的陰極與二極體D 3 的陽極連接。 在此濾波電容充放電路中,濾波電容器C 1 、C 2的Page 9 1239378 V. Description of the invention (6) Type connection, in which the diode D 3 is connected in a negative direction, and its cathode is connected to point B. Between the connection point of the filter capacitor C 1 and the diode D 4 and the connection point of the diode D 3 and the filter capacitor C 2, the diodes D 1 and D 2 are connected in series in a forward direction, of which two The cathode of the pole D 4 is connected to the anode of the diode D 1, and the cathode of the diode D 2 is connected to the anode of the diode D 3. In this filter capacitor charging and discharging circuit, the filter capacitors C 1 and C 2
充電路徑是由B點到C 1 、經二極體D 1 、D 2 、到CThe charging path is from point B to C 1, via diodes D 1, D 2, to C
2 、然後再到C點。濾波電容器C 1的放電路徑是由C 1 經B點、負載、C點、最後經二極體D 4、然後回到C2. Then go to point C. The discharge path of filter capacitor C1 is from C1 through point B, load, point C, and finally through diode D4, and then back to C
1 。濾波電容器C 2的放電路徑則是由C 2經二極體D 3 、B點、負載、C點、然後回到C 2 。 經橋式整流電路1 0與二極體D 5的直流電壓,從B點 一方面對高頻振盪電路1 4供電,另一放面經充電路徑對濾 波電容器C 1 、C 2充電,此時C 1 、C 2構成串聯的關 係,假設二極體D 1 、D 2為理想二極體(亦即不考慮其 導電電阻)< 且C 1與C 2的電容量均為C,則等效的濾 波電容量=(CxC)/(C + C)二C/2,亦即等效 的濾波電容量比單一電容器C 1或C2的電容量少 5 0 %。由於等效的濾波電容量減少,會使得輸入交流電 流波形較為平緩,諧波含量降低,進而提升其功率因數。1 . The discharge path of the filter capacitor C 2 is from C 2 through the diode D 3, point B, load, point C, and then back to C 2. The DC voltage of the bridge rectifier circuit 10 and the diode D 5 supplies power to the high-frequency oscillation circuit 14 on the one hand from the point B, and charges the filter capacitors C 1 and C 2 via the charging path on the other hand. C 1 and C 2 form a series relationship. Assuming that the diodes D 1 and D 2 are ideal diodes (that is, regardless of their electrical resistance), and the capacitances of C 1 and C 2 are both C, etc. Effective filtering capacitance = (CxC) / (C + C) = C / 2, that is, the equivalent filtering capacitance is 50% less than the capacitance of a single capacitor C 1 or C2. As the equivalent filtering capacitance is reduced, the input AC current waveform will be smoother, and the harmonic content will be reduced, thereby increasing its power factor.
第10頁 1239378 五、發明說明(7) 當B點電壓小於濾波電容器C 1 、C 2電壓之和時, 則C 1 、C 2是以並聯方式以各自的放電路徑對負載放 電,假設二極體D 1 、D 2為理想二極體(亦即不考慮其 導電電阻),且C1與C2的電容量均為C,則等效的放 電電容量=C + C= 2C,亦即等效的放電電容量比單一 電容器C1或C2的電容量多一倍,放電的時間常數也要 比單一電容器C 1或C 2的時間常數大一倍,如此使直流 電壓漣波幅度減少,這也就降低了供給燈管1 7電流的波動 幅度,使其波峰因數下降。 電電三C的一極 管盪第器間以二 燈振如容之外 , 的頻,電2另中 知高中合D,其 習與例耦、接。 ,6施此1連接 示C實經D點連 所器佳係體C點 圖容較號極與B 一電一訊二3與 第經此頻中C 6 如售明高路器D ? 。端發的電容體接 路一本絲放電極連 電的於燈充一二點 饋絲而一容以與B 反燈。之電,4與 述1接1波點C係 描管連管濾A器極 來燈出燈到此容陰 下,輸,接從電之 接中的示連。的6 6 4 1 1所,點聯D 路路圖6 A串體Page 10 1239378 V. Description of the invention (7) When the voltage at point B is less than the sum of the voltages of the filter capacitors C 1 and C 2, then C 1 and C 2 discharge the load in parallel with their respective discharge paths, assuming two poles The bodies D 1 and D 2 are ideal diodes (that is, their conductive resistance is not considered), and the capacitances of C1 and C2 are both C, then the equivalent discharge capacitance = C + C = 2C, which is equivalent The discharge capacitance is twice as large as that of the single capacitor C1 or C2, and the time constant of the discharge is also twice as large as the time constant of the single capacitor C1 or C2. This reduces the DC voltage ripple amplitude. The fluctuation amplitude of the current supplied to the lamp tube 17 is reduced, so that its crest factor is reduced. Electricity and electricity three C's one transistor is connected to the second device with a frequency of two lamps. The electricity and the other two are known as high school and D. Their habits and examples are coupled. The 6 application of this 1 connection shows that the C real warp D point is connected to the good point C of the device. The picture size is compared with the B, the electricity, the telecommunication, the second 3, and the C 6 in this frequency. If the high-frequency circuit breaker D is sold. The end of the capacitor body is connected with a wire discharge electrode, and the lamp is charged with one or two points of feed wire, and the capacitor is opposite to the B lamp. For electricity, 4 is connected to the 1-point and 1-point C-series tracing tube with filter A, and the lamp is out to this yin yin, and the output is connected to the connection from the electrical connection. 6 6 4 1 1 points, point D Road Figure 6 A string
第11頁 1239378 五、發明說明(8) 這二者會進一步使輸入交流電流I s之波形更為平緩、更為 接近正弦波形,也使使直流電壓漣波幅度進一步減少,使 其燈管1 7電流波峰因數下降。 請參考第四圖,係本發明此一較佳實施例之輸入交流 電壓:V s與父流電流I s之波形圖。如弟四圖所不,精由本發 明之功率因數修正電路,輸入交流電流I s之脈衝波形,趨 近於正弦波形,此較第二圖所示的習知電子安定器的尖銳 脈衝形狀,有大幅的改善。 本發明之高效率功率因數修正電路具有以下優點: (a )降低輸入交流電壓V s的第三次諧波含量,使總 諧波失真降到1 0 %以下,減少對電磁的污染,提高用電 的安全性。 (b)提高功率因數到〇 . 9 5以上,減少供電系統的 功率損耗。 (c )降低直流電壓波動幅度,使燈管1 7電流的波峰 因數降到1 . 7以下,延長燈,管1 7的使用壽命,還可使高 頻振盪電路1 4的零件可靠性提高,電子安定器整體的工作 可靠性也跟著提高許多。 (d )降低濾波電容器的電容量與所需耐壓,降低濾 波電容器的成本同時提高其可靠性。 對熟習此技術的人士,很顯然各種修改與變化可以施Page 11 1239378 V. Description of the invention (8) These two will further make the waveform of the input AC current I s smoother and closer to the sinusoidal waveform, and also reduce the DC voltage ripple amplitude further, making the lamp tube 1 7 The current crest factor decreases. Please refer to the fourth figure, which is a waveform diagram of the input AC voltage: V s and the parent current I s in this preferred embodiment of the present invention. As shown in the fourth figure, the power factor correction circuit of the present invention precisely inputs the pulse waveform of the alternating current I s, which approaches a sinusoidal waveform. This is sharper than the sharp pulse shape of the conventional electronic ballast shown in the second figure. Significant improvement. The high-efficiency power factor correction circuit of the present invention has the following advantages: (a) The third harmonic content of the input AC voltage V s is reduced, the total harmonic distortion is reduced to less than 10%, the electromagnetic pollution is reduced, and the application efficiency is improved. Electrical safety. (b) Increase the power factor to above 0.95 and reduce the power loss of the power supply system. (c) Reduce the amplitude of the DC voltage fluctuation, reduce the crest factor of the current of the lamp tube 17 to less than 1.7, extend the service life of the lamp and tube 17, and also improve the reliability of the components of the high-frequency oscillation circuit 14, The overall reliability of the electronic ballast has also improved a lot. (d) Reduce the capacitance and required withstand voltage of the filter capacitor, reduce the cost of the filter capacitor and increase its reliability. For those familiar with this technology, it is clear that various modifications and changes can be applied.
第12頁 1239378 五、發明說明(9) 於基於本發明的功率因數修正電路,而不偏離本發明的精 神或範圍。因此,可以預期的,本發明的修改與變化若是 符合所附申請專利範圍與其等義的界定範圍内,均為本發 明所涵蓋。Page 12 1239378 V. Description of the invention (9) The power factor correction circuit based on the present invention without departing from the spirit or scope of the present invention. Therefore, it can be expected that the modifications and changes of the present invention are covered by the present invention if they conform to the scope of the attached application patent and its equivalent definitions.
第13頁 1239378 圖式簡單說明 第一圖係習知電子安定器電路圖。 第二圖係習知電子安定器之輸入交流電壓V S與交流電流Is 之波形圖。 第三圖係依據本發明一較佳實施例之電子安定器電路圖。 第四圖係依據本發明一較佳實施例之電子安定器之輸入交 流電壓V s與交流電流I s之波形圖。 【元件符號說明】Page 13 1239378 Brief description of the diagram The first diagram is a circuit diagram of a conventional electronic ballast. The second figure is a waveform diagram of the input AC voltage V S and the AC current Is of the conventional electronic ballast. The third figure is a circuit diagram of an electronic ballast according to a preferred embodiment of the present invention. The fourth figure is a waveform diagram of the input AC voltage V s and the AC current I s of the electronic ballast according to a preferred embodiment of the present invention. [Description of component symbols]
10 橋式整流電路 12 直流濾波電路 14 面頻振盈電路 1 5 交直流轉換器 16 燈管電路 17 燈管10 Bridge rectifier circuit 12 DC filter circuit 14 Surface frequency vibration surplus circuit 1 5 AC / DC converter 16 Lamp tube circuit 17 Lamp tube
Vs 輸入交流電壓Vs input AC voltage
Is 輸入交流電流 C1、C2、C3、C4、C5、,C6 電容器 Q 1、Q 2 ,電晶體Is Input AC current C1, C2, C3, C4, C5, C6 capacitors Q1, Q2, transistor
L 1 電感器 D 卜 D 2、 D 3、 D 4、 D 5、 D 6、 D 7、 D 8、 D 9、 D 10、D11、D12 二極體L 1 inductor D, D 2, D 3, D 4, D 5, D 6, D 7, D 8, D 9, D 10, D11, D12 diodes
第14頁Page 14
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TW93106509A TWI239378B (en) | 2004-03-11 | 2004-03-11 | Power factor correcting circuit for electronic ballast |
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TW93106509A TWI239378B (en) | 2004-03-11 | 2004-03-11 | Power factor correcting circuit for electronic ballast |
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