M3 50203 八、新型說明： 【新型所屬之技術領域】 本新型疋有關於一種可熱管啟動的定功率控制電路， 特別是指一種用於須定功率控制之高照度氣體放電燈電子 式安定器。 【先前技術】 兩知度氣體放電燈（High Intensity Discharge Lamp HID Lamp)是一種具有光度強、壽命長、體積小、光效率高 、肩色性佳等特點的燈具，近來被廣泛地使用在各種戶外 及室内等重點照明的場所。不僅具有高發光效率，以其取 代高功率之白熾燈不失為一理想光源。高照度氣體放電燈 有不同程度的演色性、色溫度、及近似點光源的放電效果 ，使其較I光燈的發光品質高且在燈具的設計上更具變化 性，尤其壽命長的優點更使該高照度氣體放電燈具有極高 的經濟效益。 高照度氣體放電燈具有負增量電a的特性，因此需要 搭配安定器使用。安定器在啟動暫態需要產生足夠高的點 燈電壓以激發燈管1在穩態工作時，㈣要提供穩定的 電流給燈管，有利於延長該高照度氣體放電燈的使用壽命 ，且可使燈功率恒定、光輸出穩定。 由於高照度氣體放電燈燈管等效阻抗會隨使用時間而 增大’且燈管輸出流明與燈管功率成正比，若燈管功率固 定，則燈管電壓會隨使用時間而上昇，燈管電流會下降。 以目前安定器的設計理念而言，分财定電流控制與定功 5 M350203 率控制兩種，定電流安定器會持續供應一個穩定的工作電 流，但隨著HID管壓的增加，整體輸出功率（根據ρ = νι八 式可知）也會由額定的功率慢慢提升，輸出功率之增加可4 導致燈泡固定座溶毀或安定器可靠度降低，重則:燒= 泡或是安定器。 4又且 而採定功率輸出的安定器則不會有這種顧慮，運算電 • 4會隨著管壓的提升而降低輸出電流大小，讓整個系統的 ' 功率消耗一直維持在額定的功率大小。因此，定電流或定 籲 《壓控制對燈管等效阻抗變化之適應性差，定功率控制是 最合適之選擇。另外，為了適用於市場上各種不同廠牌型 式的燈管’由於同樣瓦數的燈管，因製造誤差與薇牌型式 之差異’會使燈管等S阻抗分佈更大，所以安定器通常也 需要較寬範圍之定功率控制。目前大多數安定器之設計導 向都是朝定功率控制設計，以維持輸出流明穩定。 參閱圖1、2,為一般市售以低頻方波驅動該高照度氣 冑放電燈的電子式安定器’市電電源連接電源整流濾波電 路之後，其功率電路架構主要可分為三級：第一級為主動 式功因修正電路10，採用昇壓型直流/直流轉換器，其具有 一昇遂電感Lb。。”、一昇壓功率開關SB()ost、一昇壓二極體 DB〇QSt ’及一昇壓電容Cdci。該主動式功因修正電路1〇可將 整流滤波後的輸入電壓提高，以供給該昇壓電容Cdci所需 的面電壓’整個昇壓型直流/直流轉換器可操作在連續導通 模式或不連續導通模式，使得輸入電流能夠追蹤輸入電壓 的波形，達到高功因的效果。 6 M350203 田。玄昇壓功率開關SB〇〇st導通時，該昇壓二極體DB00St 疋呈截止狀態’根據電感電壓與電流的關係’電感電流隨 時間遞增當該昇壓功率開關％。㈣截止時，因為電感電 心必/頁為連續’所以該昇壓二極體強迫導通。根據電 感電壓與電流的關係，電感電流隨時間遞減。因此只要調 整《亥昇壓功率開關％。。"的導通與截止時間，就能控制電感 . 電流（輸入電流）的波形。 一 第二級為功率控制電路20，採用降壓型直流/直流轉換 籲 胃’並具有一降魔功率開關SBuck、一降壓二極體DBuck、一 降壓電感LBuck，及一電容Cd。2。藉由控制供給後級電路的 電流’可以5周郎供給燈管的功率。 第二級為全橋式整流電路30，採用全橋式直流/交流轉 換斋，並具有四個功率開關Si〜S4，目的是將直流的電源轉 換成交流的低頻方波電源來驅動燈管。 配合參閱圖3，目前在業界中已成功地研發出定功率輸 出之安定器及其控制方法，例如我國發明專利公告第 • 1260953號「定功率控制裝置及其控制方法」專利案，即是 配合HID電燈使用的定功率安定器（圖3中是以直流電源& 取代前級電源輸入，並以等效電阻R來取代後級的全橋式 整流電路30與高照度氣體放電燈燈管）。 但是，文限於HID電燈製造技術及各大HID電燈製造 商之製造規格，目前各種定功率安定器在使用上的仍是僅 屬於「冷管啟動」之使用方式，也就是說，每一次該hid 燈關閉時，必須專到该hid燈管完全冷卻後才能再次將其 M350203 開啟，其等待時間在10〜30分鐘不等，使用上仍存在著許 多不便之處。 【新型内容】 因此，本新型之目的，即在提供一種可對—hid燈進 行定功率控制，且可達到熱管啟動之驅動方式的電路裝置 〇 於是，本新型之可熱管啟動的定功率控制電路裝置， 是與一電源轉換電路電連接並配合驅動一負載，該電源轉 換電路具有一比較器、一與該比較器電連接的驅動器、一 與該驅動器電連接的功率開關，及一與該功率開關及該負 載電連接的全橋式換流器，該可熱管啟動的定功率控制電 路裝置包含：一電壓偵測單元、一電流偵測單元，及一昇 壓單元。 該電壓偵測單元是與該負載電連接，可自該負載取得 一預設比例值之第一訊號。 該電流偵測單元是與該功率開關電連接，可自該功率 開關取得一第二訊號，將該第一訊號與該第二訊號加權後 ，輸入該比較器並經該比較器比較參考訊號後，產生一脈 寬調制讯號輪入予該驅動器，再經由該驅動器控制該功率 開關之責任週期，以達到定功率之控制。 該昇壓單元是與該全橋式換流器電連接，並提高輸出 至該負載之點火電壓。 本新型之功效在於，利用該電壓偵測單元與該電流偵 測單元偵測負載（HID燈管）電壓與功率開關之電流，再將兩M3 50203 VIII. New description: [New technical field] This new type is related to a constant power control circuit for heat pipe start-up, especially for a high-illuminance gas discharge lamp electronic ballast for power control. [Prior Art] High Intensity Discharge Lamp HID Lamp is a kind of luminaire with high brightness, long life, small size, high light efficiency and good shoulder color. It has been widely used in various kinds recently. Key areas of lighting, such as outdoor and indoor. Not only does it have high luminous efficiency, but it is an ideal source for replacing high-power incandescent lamps. High-illuminance gas discharge lamps have different degrees of color rendering, color temperature, and discharge effects of approximate point sources, making them more illuminating than I-lights and more versatile in design of lamps, especially for long life. The high illumination gas discharge lamp has extremely high economic efficiency. High-illuminance gas discharge lamps have the characteristics of a negative incremental electric a, so they need to be used with a ballast. The ballast needs to generate a sufficiently high lighting voltage to activate the lamp 1 during steady state operation, and (4) to provide a stable current to the lamp tube, which is beneficial to prolonging the service life of the high illumination gas discharge lamp. The lamp power is constant and the light output is stable. Since the equivalent impedance of the high-illuminance gas discharge lamp tube will increase with the use time, and the lamp output lumen is proportional to the lamp power, if the lamp power is fixed, the lamp voltage will rise with the use time, the lamp tube The current will drop. In terms of the current design concept of ballast, there are two types of control: current control and constant power 5 M350203 rate control. The constant current ballast will continue to supply a stable working current, but with the increase of HID pipe pressure, the overall output power (According to ρ = νι8) It is also slowly increased by the rated power. The increase of output power can cause the lamp holder to be dissolved or the stability of the ballast to be reduced. The weight is: burning = bubble or ballast. 4 Again, the ballast with the power output will not have this concern. The calculation power will reduce the output current as the tube pressure increases, so that the power consumption of the entire system is maintained at the rated power. . Therefore, the constant current or the constant pressure control is the most suitable choice for the control of the equivalent impedance of the lamp. In addition, in order to be applicable to various types of lamps on the market, due to the same wattage of the lamp, the difference in manufacturing error and the type of the wei-type will make the S-impedance distribution of the lamp and the like larger, so the ballast is usually also A wide range of fixed power controls is required. At present, most ballasts are designed to be oriented toward constant power control to maintain output lumen stability. Referring to Figures 1 and 2, after the electronic ballast of the high-intensity gas-discharge lamp is driven by a low-frequency square wave, the power circuit architecture can be divided into three levels: first The stage is an active power factor correction circuit 10, which employs a step-up DC/DC converter having a one-liter inductor Lb. . "", a boost power switch SB () ost, a boost diode DB 〇 QSt ' and a boost capacitor Cdci. The active power factor correction circuit 1 提高 can increase the rectified and filtered input voltage to The surface voltage required to supply the boost capacitor Cdci' The entire boost DC/DC converter can be operated in continuous conduction mode or discontinuous conduction mode, so that the input current can track the waveform of the input voltage and achieve high power efficiency. 6 M350203 Tian. When the Xuan boost power switch SB〇〇st is turned on, the boost diode DB00St 疋 is in an off state 'according to the relationship between the inductor voltage and the current'. The inductor current increases with time when the boost power switch is %. (4) At the cut-off, because the inductor core must be / continuous, the boost diode is forced to conduct. According to the relationship between the inductor voltage and the current, the inductor current decreases with time. Therefore, just adjust the "Hi boost power switch %." " conduction and cut-off time, you can control the inductance. Current (input current) waveform. A second stage is the power control circuit 20, using step-down DC / DC conversion called stomach 'and A magic power switch SBuck, a buck diode DBuck, a buck inductor LBuck, and a capacitor Cd. 2. By controlling the current supplied to the post-stage circuit, the power of the lamp can be supplied for 5 weeks. For the full-bridge rectifier circuit 30, a full-bridge DC/AC converter is used, and four power switches Si~S4 are provided for converting the DC power into an AC low-frequency square wave power source to drive the lamp. 3, currently in the industry has successfully developed a fixed power output stabilizer and its control methods, such as the Chinese invention patent announcement No. 1260953 "fixed power control device and its control method" patent case, that is, with HID lights The constant power ballast (in FIG. 3 is a DC power supply & replaces the front power supply input, and replaces the full-bridge rectifier circuit 30 and the high-illuminance gas discharge lamp tube of the subsequent stage with an equivalent resistance R). However, the text is limited to HID lamp manufacturing technology and the manufacturing specifications of major HID lamp manufacturers. At present, the use of various constant power ballasts is still only the use of "cold pipe start", that is, each time the hid When the lamp is turned off, the hid lamp must be completely cooled before the M350203 can be turned on again. The waiting time is 10 to 30 minutes, and there are still many inconveniences in use. [New content] Therefore, the purpose of the present invention is to provide a circuit device capable of performing constant power control on a -hid lamp and capable of achieving a heat pipe start driving mode. Thus, the novel heat pipe activated constant power control circuit The device is electrically connected to a power conversion circuit and cooperates to drive a load, the power conversion circuit has a comparator, a driver electrically connected to the comparator, a power switch electrically connected to the driver, and a power The switch and the full-bridge converter electrically connected to the load, the heat-control tube-starting constant power control circuit device comprises: a voltage detecting unit, a current detecting unit, and a boosting unit. The voltage detecting unit is electrically connected to the load, and can obtain a first signal of a preset ratio value from the load. The current detecting unit is electrically connected to the power switch, and can obtain a second signal from the power switch, weight the first signal and the second signal, input the comparator, and compare the reference signal by the comparator. A pulse width modulated signal is generated to be input to the driver, and the duty cycle of the power switch is controlled via the driver to achieve constant power control. The boosting unit is electrically coupled to the full bridge converter and increases the ignition voltage output to the load. The function of the novel is to use the voltage detecting unit and the current detecting unit to detect the load (HID lamp) voltage and the power of the power switch, and then the two
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M350203 者即可㈣定功率控制之目的，再配合該昇料元 2出至該負載的電壓提高，使該細燈管能夠在 =之情況下再次被擊發啟動，進而達到「熱管啟動 【實施方式】 有關本新里之則述及其他技術内容、特點與功效，在 以下配合參考圖式之_個較佳實施例的詳細說明中，將可 清楚的呈現。 如圖4、5所示’本新型可熱管啟動的定功率控制電路 裝置之較㈣施例’是與-電源轉換電路3電連接並相配 〇驅動「負載刚，該電源轉換電路3具有-比較器comp 比較器comp電連接的驅動器Driver、一與該驅動 器Driver f連接的功率開關s，及一與該功率開關s及該 負載1〇〇電連接的全橋式換流器31，該可熱管啟動的定功 率控制電路裝置包含：_電㈣測單元Kv。、—電流偵測單 元κ,’及一昇壓單元32。在本實施例中，該負載⑽為一 石英HID燈官’且具有一相配合的點火電路2〇〇，要注意 的疋’由於該點火電路2〇〇是業界中廣泛用於配合HID燈 s啟動的擊發電路，應為此技術領域中之人士所熟知的技 術’在此即未將其細部電路結構顯示出，並在圖4中僅以 示意之方式呈現。M350203 can be used for (4) the purpose of power control, and then the voltage of the load element 2 to the load is increased, so that the light tube can be fired again in the case of =, and then the "heat pipe start" is achieved. </ br> </ br> </ br> </ br> </ br> </ br> </ br> </ br> The fourth heat exchanger-initiated constant power control circuit device is electrically connected to the power conversion circuit 3 and is coupled to drive the "load just. The power conversion circuit 3 has a comparator comp comparator comparator. Driver, a power switch s connected to the driver Driver f, and a full-bridge inverter 31 electrically connected to the power switch s and the load 1〇〇, the heat-receivable constant power control circuit device comprises: _ electric (four) measuring unit Kv., - current detecting unit κ, 'and a boosting unit 32. In this embodiment, the load (10) is a quartz HID lamp official' and has a matching ignition circuit 2〇〇 , to note Since the ignition circuit 2 is a firing circuit widely used in the industry for the start of the HID lamp s, a technique well known to those skilled in the art is not shown here. And presented in FIG. 4 only in a schematic manner.
該電壓偵測單元Κνβ是電連接至該負載100，且該電流 價測單元Ki電連接該功率開關S。值得一提的是，在本較 佳實施例中，該功率開關S可以是BJT ' MOSFET或IGBT M350203 等半導體開關元件，然而半導體技術曰益精進，還有很多 種的功率開關可供運用’故實際使用時並不限於本實施例 所揭露。 接著’本段僅介紹上述電路間的連結關係與功效。該 電壓偵測單元Κν。與該負載100電連接，可自該負載1〇〇取 得一預設比例值之第一訊號。該電流偵測單元Ki則是與該 • 功率開關S電性連接，可自該功率開關s取得一第二訊號 - ，將該第一訊號與該第二訊號加權後得一電壓訊號Ves，經 鲁由輸入該比較器comp並經該比較器comp與一參考電壓 vref比較後，產生一脈寬調制訊號PWM輸入予該驅動器 Driver，再經由該驅動器Driver控制該功率開關s之責任週 期’以達到定功率之控制。 至於上述之該電壓偵測單元Kv。與該電流偵測單元& 相配合地對該HHD燈管進行定功率控制的方法，以及其所 帶來的功效，已於我國發明專利公告第1260953號「定功率 ^ 控制裝置及其控制方法」專利案中有詳盡記载，在此即不 加以贅述。另外，本實施例僅為利用該電壓偵測單元Kv。以 X電流偵測單元Ki所相配合產生定功率控制之一種較佳 、包L樣，其他的實施方式也在上述之專利案中有所揭露 〇 上亥昇壓單元32是與該全橋式換流器31電連接，並提 抑輪出至該負載i 〇〇之點火電壓。在本實施例中，該昇壓 具有相互電連接的二振盪電容C1、C2、二倍壓二 〇 D2、一充壓電容C3、一氣體放電管322，及一變 10 M350203 壓器321 ’該等振盪電容Cl、C2及倍壓二極體D1、D2是 與該點火電路200以及該全橋式換流器31電連接，並相配 合地將所接收之電壓倍增（在此是採雙倍電壓之設計，但也 可為其他倍數’端視實際應用時之設計而定，並應不揭限 於本實施例之說明），該充壓電容C3是與該等倍壓二極體 Dl、D2電連接，並可進行充壓與放電，該氣體放電管322 是與該充壓電容C3電連接，並在超過預設電壓時即呈導通 狀’在本實施例中’是使用導通電壓為lkv的氣體放電管 322，而該變壓器321則是與該氣體放電管322電連接，並 在該氣體放電管322呈導通時將其電壓提昇至一較高的電 壓以供該負載100(HID燈管）使用。 當該昇壓單元32受到前級電路之驅動時，該充壓電容 C3即會開始進行充壓，並充電至超過該氣體放電管322之 導通電壓值時，該氣體放電管322即會形成導通，而該充 壓電容C3即會透過該氣體放電管322所形成之通路進行放 電，並使該變壓器321感受到一電壓，此時該變壓器321 即會對該電壓進行電壓值轉換，並將其提昇至約15kv左右 ，進而以一高於HID燈管製造商所訂定之點火電壓來將該 hid燈管擊發，藉此達到對該HID燈管進行「熱管啟動」 之目的。 藉由上述設計’本新型之優點在於： 1.對hid i管進行定功率控制及熱管啟動有效提昇 其操作彈性及應用範圍： 利用該電壓偵測單元Kv。與該電流债測單元κ M350203 相配合地對該HID燈管進行定功率控制，再配合該 昇壓單元32之設計，以一高於hid燈管製造商所 訂定之點火電壓來將該HID燈管擊發，使該燈 吕月b在媳滅後尚未處於完全冷卻之情況下再一次被 啟動，以改善習知HID燈管僅能受限於「冷管啟動 」之操作方式，進而增加該燈管之操作彈性及可應 用範圍（例如需要快速間續照明的領域中）。 2.絕緣效果佳： 利用該昇壓單元32之變壓器321提供額外的昇 壓比，使原點火電路200之變麼器可與該昇壓單元 32之變壓器321相配合地達成預設之點火電壓，而 利用二個變壓器的設計態樣，可使每一變壓器具有 較小之圈數比，進而增加其絕緣效果並有效地提昇 其電壓轉換效率及使用安全性。 歸納上述，本新型之可熱管啟動的定功率控制電路裝 置，利用該電壓偵測單元Kv。與該電流偵測單元&偵測負 載l〇〇(HID燈管）電壓與功率開關之電流，再將兩者加權， 即可達到定功率控制之目的，再配合該昇壓單元32之設計 ，以一冋於HID燈管製造商所訂定之點火電壓來將該 燈官擊發，使該HID燈管能在熄滅後尚未處於完全冷卻之 情況下再—次被啟動，進而達到兩次啟動間不需要等待之 「熱管啟動」目的，並藉此改善習知安定器僅能對HID燈 ^進行冷言啟動之限制，以增加HID燈管之操作彈性與可 被應用之領域，故確實能達到本新型之目的。 12 M350203 惟以上所述者，僅為本新型之較佳實施例而已，當不 能以此限定本新型實施之範圍’即大凡依本新射請專利 範圍及新型說明内容所作之簡單的等效變化與修飾皆仍 屬本新型專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一般三級電路架構的電子式安定器之方塊示意 圖； ' 圖2是該三級電路架構的電子式安定器的電路示意圖 9 圖3是我國發明專利公告第126〇953號「定功率控制裝 置及其控制方法」專利案之局部電路方塊示意圖，特別是 指用於降壓型（Buck)電源轉換電路； 圖4是一電路示意圖’說明本發明之可熱管啟動的定 功率控制電路裝置之較佳實施例；及 圖5是一電路圖，說明該較佳實施例中之一昇壓單元 之電路結構與一負載之連結關係。 13 M350203 【主要元件符號說明】 3........ ••電源轉換電路 Vcs ···· •…準位提昇訊號 31....... ••全橋式換流器 Vcs ···· •…參考電壓 32....... ••昇壓單元 D1 ··_· •…倍壓二極體 321 •… ••變壓器 D2 ···· •…倍壓二極體 322 ·.·.· ••氣體放電管 Cl… •…振盪電容 comp … ••比較器 C2 ···· …·振盪電容 Driver · ••驅動器 C3 ···· …·充壓電容 s......... ••功率開關 100… •…負載 Kv〇…… ••電壓偵測單元 200… •…點火電路 Ki........ ••電流偵測單元The voltage detecting unit Κνβ is electrically connected to the load 100, and the current measuring unit Ki is electrically connected to the power switch S. It should be noted that in the preferred embodiment, the power switch S can be a semiconductor switching component such as a BJT 'MOSFET or an IGBT M350203. However, the semiconductor technology is highly beneficial, and a variety of power switches are available. The actual use is not limited to the embodiment. Then, this section only introduces the connection relationship and efficacy between the above circuits. The voltage detecting unit Κν. Electrically connected to the load 100, a first signal of a preset ratio value can be extracted from the load 1. The current detecting unit Ki is electrically connected to the power switch S, and a second signal is obtained from the power switch s, and the first signal and the second signal are weighted to obtain a voltage signal Ves. After inputting the comparator comp and comparing the comparator comp with a reference voltage vref, generating a pulse width modulated signal PWM input to the driver Driver, and then controlling the duty cycle of the power switch s via the driver Driver to achieve Constant power control. As for the voltage detecting unit Kv described above. The method for controlling the power of the HHD lamp in conjunction with the current detecting unit & and the effect thereof is provided in the invention patent publication No. 1260953 "Constant power control device and control method thereof" The patent case is well documented and will not be repeated here. In addition, this embodiment only utilizes the voltage detecting unit Kv. The X current detecting unit Ki cooperates to generate a preferred power control, and the other embodiments are also disclosed in the above patents. The upper boosting unit 32 is connected to the full bridge. The inverter 31 is electrically connected and suppresses the ignition voltage that is turned to the load i. In this embodiment, the boost has two oscillating capacitors C1, C2, a double voltage diode D2, a charging capacitor C3, a gas discharge tube 322, and a variable 10 M350 203 321 ' The oscillating capacitors C1, C2 and the voltage doubling diodes D1, D2 are electrically connected to the ignition circuit 200 and the full bridge converter 31, and cooperate to multiply the received voltage (here, the double The design of the voltage doubler, but may also be other multiples depending on the design of the actual application, and should not be limited to the description of the embodiment), the charging capacitor C3 is the same with the voltage doubled diode D1 D2 is electrically connected, and can be charged and discharged. The gas discharge tube 322 is electrically connected to the charging capacitor C3, and is in a conducting state when the preset voltage is exceeded. In this embodiment, the conduction is used. a gas discharge tube 322 having a voltage of lkv, and the transformer 321 is electrically connected to the gas discharge tube 322, and when the gas discharge tube 322 is turned on, boosts its voltage to a higher voltage for the load 100 ( HID tube) used. When the boosting unit 32 is driven by the pre-stage circuit, the charging capacitor C3 starts to be charged, and when the charging voltage exceeds the conduction voltage value of the gas discharge tube 322, the gas discharge tube 322 is formed. Turning on, and the charging capacitor C3 is discharged through the path formed by the gas discharge tube 322, and the transformer 321 senses a voltage, and the transformer 321 will perform voltage conversion on the voltage, and Raising it to about 15kv, and then firing the hid lamp with an ignition voltage higher than that specified by the HID lamp manufacturer, thereby achieving the purpose of "heat pipe start" for the HID lamp. With the above design, the advantages of the present invention are as follows: 1. The power control and the heat pipe start of the hid i tube are effectively improved, and the operation flexibility and application range are utilized: The voltage detecting unit Kv is utilized. The HID lamp is controlled in accordance with the current debt measuring unit κ M350203, and the design of the boosting unit 32 is used to set the HID lamp with an ignition voltage higher than that of the hid lamp manufacturer. The tube is fired so that the lamp Lu Lu b is activated again after it has not been completely cooled after the annihilation, so as to improve the conventional HID lamp can only be limited by the "cold pipe start" operation mode, thereby increasing the lamp The operational flexibility of the tube and the range of applications (eg in areas where rapid inter-continuous illumination is required). 2. The insulation effect is good: the transformer 321 of the boosting unit 32 is used to provide an additional boosting ratio, so that the transformer of the original ignition circuit 200 can cooperate with the transformer 321 of the boosting unit 32 to achieve a predetermined ignition voltage. By using the design of the two transformers, each transformer can have a smaller turns ratio, thereby increasing its insulation effect and effectively improving its voltage conversion efficiency and safety. In summary, the novel heat-control tube-starting constant power control circuit device utilizes the voltage detecting unit Kv. And the current detecting unit & detects the voltage of the load 〇〇 (HID lamp) voltage and the power switch, and then weights the two to achieve the purpose of constant power control, and cooperates with the design of the boosting unit 32 The lamp is fired with a ignition voltage set by the manufacturer of the HID lamp, so that the HID lamp can be activated again after being extinguished without being completely cooled, thereby achieving two start-ups. There is no need to wait for the "heat pipe start" purpose, and to improve the conventional ballast can only limit the HID lamp to the cold start, in order to increase the operational flexibility of the HID lamp and the field that can be applied, it can indeed be achieved. The purpose of this new type. 12 M350203 However, the above is only the preferred embodiment of the present invention. When it is not possible to limit the scope of the present invention, it is a simple equivalent change made by the scope of the patent and the new description. And modifications are still within the scope of this new patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an electronic ballast of a general three-stage circuit architecture; 'FIG. 2 is a circuit diagram of an electronic ballast of the three-stage circuit architecture. FIG. 3 is a 126th aspect of the invention patent of China.局部953 953 "Fixed power control device and its control method" patent case partial circuit block diagram, especially for buck type (buck) power conversion circuit; Figure 4 is a circuit schematic 'illustration of the present invention, the heat pipe start A preferred embodiment of the constant power control circuit device; and FIG. 5 is a circuit diagram illustrating the connection relationship between the circuit structure of a boosting unit and a load in the preferred embodiment. 13 M350203 [Explanation of main component symbols] 3........ ••Power conversion circuit Vcs ···· •...Level boost signal 31....... ••Full bridge inverter Vcs ···· •...reference voltage 32....... •• boost unit D1 ··_· •...voltage doubler 321 •... ••transformer D2 ···· •...time doubler Body 322 ····· ••Gas discharge tube Cl... •...Oscillation capacitor comp ... ••Comparator C2 ······Oscillation capacitor Driver ·••Drive C3 ······Charging capacitor s ......... ••Power switch 100... •...Load Kv〇... ••Voltage detection unit 200... •...Ignition circuit Ki........ •• Current detection unit
C 14C 14