200908808 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種功率控制電路及具有該功率控制 電路的電子安定器，特別是指一種適用於高照度氣體放電 燈的功率控制電路及具有該功率控制電路的電子安定器。 【先前技術】 高照度氣體放電（high intensity discharge，HID)燈的等 效阻抗因為會隨著使用時間而增大，因此為了維持燈管輸 出的流明穩定，燈管需要接收一個穩定的功率，因此需要 一個功率控制電路用來控制提供給燈管的功率。 美國專利公開號 2006/0261746 A1，名為 ’’Power control circuit for controlling rated power supplied to a load” 中，提 出一種功率控制電路，且該功率控制電路適用於一高照度 氣體放電燈的電子安定器内。 參閱圖1，該電子安定器包含一濾波整流電路1、一主 動功率因數修正電路2、一功率控制電路3及一全橋換流電 路4。 該濾波整流電路1對一交流電壓進行濾波和整流，且 輸出一直流電壓。 該主動功率因數修正電路2是一種昇壓（boost)直流-直 流轉換器，且包括一昇壓電感L、一昇壓功率開關S、一昇 壓二極體D及一電容C。該主動功率因數修正電路2昇壓 該濾波整流電路1輸出的直流電壓，且產生已昇壓的直流 電壓給該電容C。 5 200908808 該功率控制電路3可調整輸入至燈管的功率。而該功 率控制電路3的詳細作動情形稍後會再加以描述。 該全橋換流電路4可將該功率控制電路3輸出的直流 電壓轉換成交流電壓以驅動該燈管。 參閱圖2，該功率控制電路3包括一降壓⑽叫直流-直 流轉換器、—電㈣測單元33、-電流偵測單元34、一比 較器35和一驅動器36。且該降壓直流_直流轉換器包括一 電感-電容(LC)電路31和一功率開關單元32。且該電感-電 容電路31包括一電感L、一二極體〇和一電容c。 該功率開關單元32與該電感·電容電路31電連接，且 為了方便說明，可以以—直流電$ Vi代表該主動功率因數 修正電路2輸出的直流電塵，而該功率關單元μ可切換 地將該直流電M Vi送入該電感-電容電路31。此外，可將 該全橋換流電路4和該燈管以—負載R表示’且該電感-電 容電路31可產生一輸出電壓乂〇到該負載r。 該電壓偵測單元33偵測施於該負載尺上的輸出電壓％ ，且根據偵測到的電壓產生一第—電壓信號νι。 該電流偵測單元34 _流經該功率開關單元Μ的電 流，且根據偵測到的電流產生—第二電㈣號 該比較器35將該第—電壓信號νι和該第二電壓信號 V2的總合與-參考電壓Vref比較，且根據比較結果輸出一 脈寬調變信號。 該驅動器36根據該比較器35輸出的脈寬調變信號產 動信號來控制該功率開關單元32的工作週期(-y 6 200908808 cycle)，以藉此控制提供給該負載R的功率對應於該參考電 壓 Vref。 但此習知的功率控制電路3中’電流偵測單元％是每 一週期㈣—次，電壓偵測單元33所_到的是該輸出電 壓Vo =平均值，而运兩俄測結果相加後會造成電流偵測的 反應變慢’而無法達到即時調整功率的目的。此外，當負 載R開路或短路時，電流谓測單元34或電壓侧單元田Μ 所摘測到的信號為零，因而該功率開關單元32會導通，造 成輸出電壓Vo將等於輸入電麼Vi，輸出暫態響應很差導= =於該功率控制電路3後級（如：全橋換流電路4)的電壓應 ^於别級，因此後級的電路需要使用耐高㈣元件（如： 二橋：：電路4、中作為開關的電晶體)以避免受損，而耐高 牛的使用將造成電路成本的上升。 【發明内容】 因此，本發明之目的，即在 率的功率控制電路。 卩在知供一種可以即時調整功 而本發明的另一目的，即為與报 子安定器。 的即在提供一種可節省成本的電 於是，本發明功率控制 率„ - 手徑制電路，包含-負载電路、一功 +開關早兀、一電壓偵 制留- 早疋、一誤差放大器、—電流# d皁兀、一比較器及一驅動模組。 ' 負载電路適用於連接一 载上。功率F1MP ,、戰且輸出-輪出電壓到該負 力革開闕早几與該負載電路電連接 電廢以可切換地提供該輸入電麗钱收輸入 、，σ ex負載電路。電壓偵測 7 200908808 單元债測施加於該負载上的該輸出電壓之值，並根據 出電壓之值產生一第一電壓信號。誤差放大器接收該第— 電壓信號及-參考電壓，並輸出—第二電壓信號，且該第 二電壓信號與該第-電壓信號和該參考電壓之間的誤差相 關。電流销測單元侦測流經該功率開關單元的電流，並根 據該電流值產生一第三電壓信號。比較器比較該第二電壓 信號和該第三電壓信號，且產生一比較信號。驅動模組根 據，比較器的比較信號產生一驅動信號，以驅動該功率開 關早X的切換，以藉此控制提供給該負載的功率。 而本發明的電子女定器包含上述的功率控制電路和一 整流電路及一換流電路。 該整流電路m電壓進行整流，且輸出—直流電摩 二該換流電路與該燈管電連接，以驅動該燈管。該功率控制 電路電連接於該整流電路和該換流電路之間，並接收該直流 、壓且產生輸出電壓給該換流電路，並控制提供給該換 凉·電路的功率。 本發明的功率控制電路和電子安定器把電壓迴路的偵 測結果和電流迴路㈣測結果分開，且可簡易地設定最大 電壓輸出，降低了位於該功率控制電路後級（如〔換流電路） 的電壓應力，因此後級的電路不需使用耐高壓的元件，而 減少了電路的成本。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之十二個較佳實施例的詳細說明中，將 8 200908808 可清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 明内容中’類似的元件是以相同的編號來表示。 >參閱圖3 ’本發明功率控制電路之第_較佳實施例包含 一高側（Mgh-Side)的降麼（buck)直流_直流電壓轉換器、一電 壓偵測單元53、一電流偵測單元54、一誤差放大器55、一 比車乂<™ 56和-驅動模纟且57。且該降壓直流·直流電壓轉換 器包括一負載電路51和一功率開關單元52。 該負載電路51包括一電感L、一二極體〇和一電容c 。該電感L之第一端、該功率開關單元52之第一端及該二 極體D之陰極電連接，而該二極體D之陽極與該電容。之 第一端電連接，該電容C之第二端與該電感L之第二端電 連接。 當該功率開關單it 52導通的時候一電流會從輸入電 壓vi經過功率開關單元52流經電感L、電容c。而當該功 率開關單το 52不導通的時候，由於流過電感[上的電流必 須為連續值，因此二極體D被強迫導通，進而電感l上儲 存之電功率轉移至電容C上。 該電壓偵測單元53偵測施加於一負載R上的輸出電壓 V〇，且根據該輸出電壓Vo產生一第一電壓信號V1。 在此實施例中，該電壓偵測單元53包括一第一電阻以 和-第二電阻R2,該第一電阻R1和第二電阻R2串聯後與 該負載R並聯，且該第二電阻上的跨壓即為該第一電壓作 號VI，且該第一電壓信號v；[的值為vl=v〇*R2/(Ri+R2)。 9 200908808 該&差放大器55包括一放大單元A2、—第三電阻们 及-第四電阻R4。該放大單元A2的正輸入端接收一參考 電屢Vref。該放大單元A2的負輸人端透過第三電阻们接 =第：電屋信號V1，且該放大單…負輸入端也透 電阻R4電連接到放大單元Μ的輸出端。而該誤差 V2C單元A2的輸出端輪出—第二刪號 V2=^J(Vref_V1)+Vref。 士該電流靖元54價測流經該功率開關單元52的電 :’且根據谓測到的電流產生一第三電壓信號Μ。且在一 ΓΓ:電則單元54包括-連接於該功率開關單 :5;之“路徑上的第五電阻R5，而該第三電壓信號w 為該第五電阻R5上的跨壓。 ' 該比較器56比較該第二電壓信號 號们，且產生—比較信號給該驅動模組57。 電 該驅動模組57根據該比較器56的 率開關…切換的工作週期(如 ，=制該功 供給該負載R的功率。該.驅動模植57精此控制提 (latch)571 ' 572 ' 匕括—鎖存單元 裉盈器572、一驅動單元573。 該比…的輸出信號輪入該鎖存 (Reset)，而該振盪器572 的重》又触 的™且該鎖存該鎖存單元-1 單元573。 的輸出信號輪入該驅動 該驅動單元57λ扭嬙处‘ 驅動信號給功率開關單=存571的輪出信號產生- 早兀52的-控制輸入單元52卜以改 10 200908808 變功率_單元52切換的工作週期。且在一實施例中，該 力率開關單元52包括一如電晶體的開關，且該控制輸入單 兀521疋包括該電晶體的一控制端，如：電晶體的閘極。 圖4(a)說明了該輪出電壓v〇，圖4⑻說明了輸入至該 比較器56的兩輸入信號’即：由誤差放大器55輸出的第 “ 號V2(虛線）和由該電流偵測單元輸出的第三電 號V3(實線），而圖4⑷說明了該驅動單元573輸出的 驅動信號。 值得注意的是，第—實施例因為加人了誤差放大器Η 把電壓迴路的偵測結果和電流迴路的债測結果分開， 且因為加入誤差放大器55後，輸出電壓Vo的最大值可以 被調整，而降低了位於該功率控制電路後級(如：全橋換流 電）的電壓應力，因此後級的電路不需使用耐高麼的元件 ’而減少了電路的成本。此外，電流偵測單元54的债測結 果直接輸入該比較H 56,而不像習知那樣需和電壓偵測單 兀53的彳貞測、结果相加，因而不會有時間延遲與響應不好的 問題。 參閱圖5,本發明功率控制電路之第二較佳實施例較第 較佳實施例的差異在於，更包含一輸入電壓偵測單元％ 該輸入電壓偵測單元58可偵測輪入電壓％的變化，且根 據偵測的結果產生—第四電壓信號V4來控制該振盈器572 的振盡頻率。即當輸人電壓Vi升高時（也就是第四電壓信號 V4升高時)，降低該振盪器572的振盪頻率。 如圖6(a)為該輸人錢Vi由低變高時圖咐)為該振 11 200908808 信號，圖6⑷的虛線為誤差放…輸出 二S 2’而圖_實線為電流偵測單元54輸 ^ 錢信號V3’圖6(d)說明了該驅動單元573輸出 的驅動信號。 箱出 回歸參閱圖5’該輸入電壓偵測單元58包括一 阻R6和一第七電阻R7，且 x罘，、電阻R0和第七電阻R7 串聯在一起後與該輸入電壓Vi 电！ vi並聯，且輸入電壓偵測單元 58將該第七電阻r?上的於 上的跨壓乘上一比例kb，以得到該第 四電壓信號V4。 參閱圖7’本發明功率控制電路之第三較佳實施例較第 較k貝施例的差異在於更包含一輸入電壓伯測單元^， 該輸入電壓偵測單元59可偵測輸入電壓vi的變化，且根據 偵測的結果產生一第五電壓信號V5。 該比較器56之一端接收該第五電壓信號V5和該電流 偵測單元54輸出的第三電壓㈣V3之總和，且另一端接 收該第二電壓信號V2。 、如圖8(a)為該輸入電壓Vi由低變高時，圖8(b)的虛線 為誤差放大器55輸出的第二電壓信號V2，而圖8(b)的實線 為第五電壓信號V5與第三電壓信號V3的總和，圖8(c)說 明了該驅動單元573輪出的驅動信號。 回歸參閱圖7，該輪入電壓偵測單元59包括一第八電 阻R8和一第九電阻R9，且該第八電阻R8和第九電阻R9 串聯在一起後與該輸入電壓Vi並聯，且輸入電壓偵測單元 59將該第九電阻R9上的跨壓乘上一比例kb，以得到該第 12 200908808 五電壓信號V5。 參閱圖9,本發明功率控制電路之第四較佳實施例與第 佳實施例類似，不同的地方在於第五電壓信號Μ是與 一電髮信號加總’且加總後的信號送人該誤差放大 55 〇 ° 而第四較佳實施例的信號可參閱圖1〇，圖1〇⑷為該輸 〇電M Vi由低變高時’目1〇⑻的虛線為誤差放大器乃輸 出的信號V2，，而圖剛的實線為第三電屡信號v3，圖 10(〇)說明了該驅動單元573輪出的驅動信號。 參閲® U，本發明功率控制電路之第五較佳實施例與 =較佳實施例不同的地方在於第五實施例的電壓轉換器 疋一種昇壓（boost)直流-直流電壓轉換器。 參閱圖12,本發明功率控制電路之第六較佳實施例與 -較佳實施例類似，不同的地方在於第六實施例的電壓 轉換器是-種正向（f0rward)直流_直流電磨轉換器。且其包 含的負載電路51包括—變壓器τ、二個二極體d、一電感 及一電容C。 〃閱圖13’本發明功率控制電路之第七較佳實施例與 第一較佳實施例類似，不同的地方在於第七實施例的電壓 轉換15是—種返跳式咖叫直流·直流電壓轉換器。且其 包含的負載電路51包括-變壓器T、一二極體0及一電容 C 〇 >閱圖14本發明功率控制電路之第八較佳實施例盥 第一較佳實施例類似’不同的地方在於第八實施例中的電 13 200908808 聖轉換器疋-種推挽式（push_pull)直流.直流電壓轉換器。 且其包含的負載電路51包括一變壓器τ、二個二極體〇、 一電感L及一電容c，且該功率開關單元52包括兩個被該 驅動單元573控制的開關。 參閱圖15,本發明功率控制電路之第九較佳實施例與 第-較佳實施例類似，不同的地方在於第九實施例中的電 壓轉換器是—種半橋（祕bddge)直流直流電壓轉換器。且 其包含的負載電路51包括一變壓器T、二個二極體D、_ 電感L及二個電容匚。 參閱圖16,本發明功率控制電路之第十較佳實施例與 第-較佳實施例類似，不同的地方在於第十實施例中的電 壓轉換器是一種全橋卿-bHdge)直流-直流電壓轉換器。且 其包含的負載電路51包括一變壓器τ、二個二極體d、_ 電感^及二個電容c，且該功率開關單元52包括四個被該 驅動單元573控制的開關。 參閱圖17,本發明功率控制電路之第十一較佳實施例 與第一較佳實施例類似，不同的地方在於第十一實施例中 的電Μ轉換ϋ是-種降壓_M(buek_bQ。啦流.直流電壓 轉換器。 參閱圖18,本發明功率控制電路之第十二較佳實施例 與第一較佳實施例類似，不同的地方在於第十二實施例中 的電壓轉換器是一種低側(1〇w_side)降壓直流-直流電壓轉換 器。在此實施例中，該電壓偵測單元53，是一差動放大器， 該差動放大器包括一放大單元A1、二個第一電阻ri，及二 14 200908808 個第二電阻r2,， 別m带 早兀A1的正輸入端和負輸入端分 A 阻R1跨接於該負載R的兩端，且該放大單元 1輸人端也透過其中—第二電阻们，電連接到地，而 ㈣=早:A1的負輸人端也透過另—第二電阻R2,電連接 的輸出端。而該放大單元A1的輸出端即 輸出該弟一雷愿古铺· ° ’且該第一電壓信號VI的值為 V1=(R2/R1)*Vo。 值得注意的是，該電㈣測單元53、53，、輸入電㈣ 測…8、59的其他實施態樣包括以光輕合器、電壓轉換 态或運算放大器來實現，且該雷产 且涊電机偵測單兀54的其他實施 I、樣匕括以電流轉換器或運算放大器實現。 參閱圖19和圖3 ’而本發明的電子安定器之—實施例 適用於驅動-燈管9卜且包含—整流電路％、—換流電路 94及上述任一實施例的功率控制電路92。 該整流電路93將市電的交流電壓進行整流，且輸出直 流的輸入電壓Vi。 該換流電路94與該燈管91電連接，以驅動該燈管91 該功率控制電路92電連接於該整流電路％和該換流 電路94之間。且該功率控制電路92的功率開關單元^接 收該輸入電壓Vi，且可切換地將該輸人電壓％提供給負載 電路51 ’且該負載電路51產生輸出電麗％給負載汉。而 負載R則為換流電路94和燈管91。 綜上所述，本發明中因為加入了誤差放大$ Μ，最大 15 200908808 的輸出電壓可以被調整，而降低了位於該功率控制電路後 、：的電壓應力，因此減少了電路的成本。此外，電流偵測 單元54的偵測結果直接輸入該比較器56,因而不會有時間 延遲的問題。 θ 准以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍’即大凡依本發明中請專利 範圍及發明說明内容所作之簡單的等效變化與㈣，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1疋一習知的電子安定器之電路圖； 圖2是習知的功率控制電路的電路圖； 圖3是本發明功率控制電路之第—較佳實施例的電路 ，圖趣例的信號曲線，圖4⑷為輸出電壓 ⑻的虛線為第二„信號且實線 圖4⑷為驅動信號； ㈣5旒，而 圖5是本發明功率控制電路之第二較佳實施例的電路 是第二較佳實施例的信號曲線 ，圖 號， 圖； 6__的輪出作翰入㈣ 而ι… （)的虛線為第二_ 而圖6⑷的實線為第三電壓信號， ' 圖7县太恭ηη ()為驅動信號； 本發月功率控制電路之第三較 佳實施例的電舆 圖8(a)為輸入電壓 圖8是第三較佳實施例的信號曲線 16 200908808 ，圖8(b)的虛線為第二電壓信號，且實 圖 壓 第三 圖； 第五電壓信號的總和，而圖8⑷為驅㈣號第三電壓信號和 ;圖9是本發明功率控制電路之第四較佳實施例的電路 圖10是第四較佳實施例的信號曲線 ，圖10⑻的虛線為為誤差放大器 a且二電 三電壓信號，而圖释)為驅動信號；且實線為 圖U是本發明功率控制電路之第五較佳實施例的電路 圖； 圖； ，•圖12是本發明功率控制電路之第六較佳實施例的電路 .圖13是本發明功率控制電路之第七較佳實施例 的電路 圖； 圖； 圖； 圖Η是本發明功率控制f路之第八較佳 圖15是本發明功率㈣電路之第九較佳 圖16是本發明功率控制電路之第十較佳 實施例的電路 實施例的電路 實施例的電路 路圖； 圖Π疋本發明功率控制電路之第十 較佳實施例的電 二較佳實施例的電 圖18是本發明功率控制電路之第十 路圖，·及 圖 圖19是本發明電子安Μ之—實施例的方塊 17 200908808 【主要元件符號說明】 51......... 負載電路 Vo…… …輸出電壓 52......... 功率開關單元 VI ··. …第一電壓信號 521 ....... 控制輸入單元 V2 •.… …第二電壓信號 53 ' 535· 電壓偵測單元 V3 ••… …第三電壓信號 ·«·*»«··« 電流偵測單元 V4 ••… …第四電壓信號 55......... 誤差放大器 V5 ·.··， …第五電壓信號 56......... 比較器 Vref · · …參考電壓 57......... 驅動模組 R....... …負載 571 ....... 鎖存單元 R1 ••… …第一電阻 572 ....... 振盪器 R2 ••… …第二電阻 573 ....... 驅動單元 R3 •… …第三電阻 58、59 ·. 輸入電壓偵測單 R4 •…· …第四電阻 元 R5 ••… …第五電阻 Al、A2 · 放大單元 R6 ••… …第六電阻 L.......... 電感 R7 ..... …第七電阻 D.......... 二極體 R8 ···.， …第八電阻 Ό 〇 ..... .......... 电谷 lx y …乐几％ P且 Vi......... 輸入電壓 T....... …變壓器 18200908808 IX. The invention relates to a power control circuit and an electronic ballast having the power control circuit, in particular to a power control circuit suitable for a high illumination gas discharge lamp and having An electronic ballast of the power control circuit. [Prior Art] The equivalent impedance of a high intensity discharge (HID) lamp increases with the use time, so in order to maintain the lumen stability of the lamp output, the lamp needs to receive a stable power, so A power control circuit is needed to control the power supplied to the lamp. U.S. Patent Publication No. 2006/0261746 A1, entitled "'Power Control circuit for controlling rated power supplied to a load", proposes a power control circuit, and the power control circuit is suitable for an electronic ballast of a high illumination gas discharge lamp Referring to Figure 1, the electronic ballast includes a filter rectifier circuit 1, an active power factor correction circuit 2, a power control circuit 3, and a full bridge converter circuit 4. The filter rectifier circuit 1 filters an AC voltage. And rectifying, and outputting a DC voltage. The active power factor correction circuit 2 is a boost DC-DC converter, and includes a boost inductor L, a boost power switch S, and a boost diode. The body D and a capacitor C. The active power factor correction circuit 2 boosts the DC voltage outputted by the filter rectifier circuit 1 and generates a boosted DC voltage to the capacitor C. 5 200908808 The power control circuit 3 can adjust the input to The power of the lamp. The detailed operation of the power control circuit 3 will be described later. The full bridge converter circuit 4 can control the power. The output DC voltage is converted into an AC voltage to drive the lamp. Referring to FIG. 2, the power control circuit 3 includes a step-down (10) called DC-DC converter, an electric (four) measuring unit 33, a current detecting unit 34, A comparator 35 and a driver 36. The step-down DC-DC converter includes an inductor-capacitor (LC) circuit 31 and a power switching unit 32. The inductor-capacitor circuit 31 includes an inductor L and a diode. The power switch unit 32 is electrically connected to the inductor/capacitor circuit 31, and for convenience of explanation, the direct current dust output by the active power factor correction circuit 2 can be represented by the DC power $Vi, and the power is off. The unit μ can switchably transmit the DC power M Vi to the inductor-capacitor circuit 31. Further, the full bridge converter circuit 4 and the lamp tube can be represented by a load R and the inductor-capacitor circuit 31 can generate a The output voltage is detected to the load r. The voltage detecting unit 33 detects the output voltage % applied to the load scale, and generates a first voltage signal νι according to the detected voltage. The current detecting unit 34 _ Flow through the power The current of the cell , is generated according to the detected current—the second electric (four) number. The comparator 35 compares the sum of the first voltage signal νι and the second voltage signal V2 with the reference voltage Vref, and compares according to As a result, a pulse width modulation signal is output. The driver 36 controls the duty cycle of the power switching unit 32 (-y 6 200908808 cycle) according to the pulse width modulation signal generation signal output from the comparator 35, thereby providing control supply. The power given to the load R corresponds to the reference voltage Vref. However, in the conventional power control circuit 3, the current detecting unit % is every cycle (four)-time, and the voltage detecting unit 33 is the output voltage. Vo = the average value, and the addition of the two Russian test results will cause the current detection reaction to slow down', and the purpose of adjusting the power in real time cannot be achieved. In addition, when the load R is open or shorted, the signal measured by the current counter unit 34 or the voltage side unit field is zero, and thus the power switch unit 32 is turned on, so that the output voltage Vo will be equal to the input power Vi. The output transient response is very poorly == The voltage of the latter stage of the power control circuit 3 (such as the full-bridge converter circuit 4) should be at a different level, so the circuit of the latter stage needs to use high-resistance (four) components (such as: Bridge:: Circuit 4, the transistor used as the switch) to avoid damage, and the use of high cattle will cause the circuit cost to rise. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a power control circuit at a rate. It is known that one can adjust the work in real time and another object of the present invention is to work with the newspaper stabilizer. That is to provide a cost-saving electric power, the power control rate of the present invention „ - hand diameter circuit, including - load circuit, one power + switch early, one voltage detection stay - early 疋, an error amplifier, - Current #d saponin, a comparator and a drive module. 'The load circuit is suitable for connecting a load. The power F1MP, the battle and the output-wheel voltage to the negative force is opened several times with the load circuit. Connect the electric waste to switchably provide the input electric charge input, σ ex load circuit. Voltage detection 7 200908808 unit debt test the value of the output voltage applied to the load, and generate a value according to the value of the output voltage a first voltage signal, the error amplifier receives the first voltage signal and the - reference voltage, and outputs a second voltage signal, and the second voltage signal is related to an error between the first voltage signal and the reference voltage. The measuring unit detects a current flowing through the power switching unit, and generates a third voltage signal according to the current value. The comparator compares the second voltage signal and the third voltage signal, and generates a comparison signal The driving module generates a driving signal according to the comparison signal of the comparator to drive the switching of the power switch early X to thereby control the power supplied to the load. The electronic female device of the present invention comprises the power control circuit described above. And a rectifying circuit and a commutating circuit. The rectifying circuit m voltage is rectified, and the output-DC electric motor is electrically connected to the lamp tube to drive the lamp tube. The power control circuit is electrically connected to the rectifying circuit. Between the circuit and the converter circuit, and receiving the DC, voltage and generating an output voltage to the converter circuit, and controlling the power supplied to the circuit breaker. The power control circuit and the electronic ballast of the present invention put the voltage circuit The detection result is separated from the current loop (4) measurement result, and the maximum voltage output can be easily set, and the voltage stress at the rear stage of the power control circuit (such as [commutation circuit]) is lowered, so that the circuit of the latter stage does not need to be resistant. High-voltage components, which reduce the cost of the circuit. [Embodiment] The foregoing and other technical contents, features and effects of the present invention are In the detailed description of the twelve preferred embodiments with reference to the drawings, 8 200908808 can be clearly presented. Before the present invention is described in detail, it is noted that in the following description, 'similar elements are The same number is used. > Referring to Figure 3, the first embodiment of the power control circuit of the present invention includes a high side (Mgh-Side) buck DC-DC voltage converter, a voltage detector. The measuring unit 53, a current detecting unit 54, an error amplifier 55, a yoke <TM 56 and a driving module and 57. And the step-down DC/DC voltage converter comprises a load circuit 51 and a power The switch unit 52. The load circuit 51 includes an inductor L, a diode 〇, and a capacitor c. The first end of the inductor L, the first end of the power switch unit 52, and the cathode of the diode D are electrically connected. And the anode of the diode D and the capacitor. The first end is electrically connected, and the second end of the capacitor C is electrically connected to the second end of the inductor L. When the power switch unit it 52 is turned on, a current flows from the input voltage vi through the power switch unit 52 through the inductor L and the capacitor c. When the power switch single το 52 is not turned on, since the current flows through the inductor [the current must be a continuous value, the diode D is forced to conduct, and the electric power stored on the inductor 1 is transferred to the capacitor C. The voltage detecting unit 53 detects an output voltage V〇 applied to a load R, and generates a first voltage signal V1 according to the output voltage Vo. In this embodiment, the voltage detecting unit 53 includes a first resistor and a second resistor R2. The first resistor R1 and the second resistor R2 are connected in series with the load R, and the second resistor The voltage across the voltage is the first voltage number VI, and the value of the first voltage signal v; [vl=v〇*R2/(Ri+R2). 9 200908808 The & difference amplifier 55 includes an amplifying unit A2, a third resistor, and a fourth resistor R4. The positive input terminal of the amplifying unit A2 receives a reference voltage Vref. The negative input end of the amplifying unit A2 is connected to the first electric resistance signal V1 through the third resistor, and the negative input terminal is also electrically connected to the output end of the amplifying unit 透 through the resistor R4. The error V2C unit A2 outputs the output - the second deletion number V2 = ^ J (Vref_V1) + Vref. The current Jingyuan 54 measures the electricity flowing through the power switching unit 52: and generates a third voltage signal 根据 based on the measured current. And in one: the electrical unit 54 includes - connected to the power switch: 5; "the fifth resistor R5 in the path, and the third voltage signal w is the voltage across the fifth resistor R5." The comparator 56 compares the second voltage signal numbers and generates a comparison signal to the driving module 57. The driving module 57 switches the duty cycle according to the rate switch of the comparator 56 (eg, = the work) The power supplied to the load R. The drive mold 57 is controlled by a latch 571 '572' to include a latch unit 572 and a drive unit 573. The output signal of the ratio is inserted into the lock. Reset, and the oscillator 572 is again touched by the TM and the latched latch unit-1 unit 573. The output signal is driven into the drive unit 57λ to the 'driver' signal to the power switch The single-stored 571 round-out signal is generated - the early-in-a-52 control input unit 52 is modified to change the duty cycle of the 200908808 variable power_unit 52. And in an embodiment, the force rate switch unit 52 includes a switch of the transistor, and the control input unit 521 疋 includes a control of the transistor For example, the gate of the transistor. Fig. 4(a) illustrates the wheel voltage v〇, and Fig. 4(8) illustrates the two input signals input to the comparator 56, i.e., the number V2 output by the error amplifier 55. (dashed line) and the third electric number V3 (solid line) output by the current detecting unit, and FIG. 4(4) illustrates the driving signal outputted by the driving unit 573. It is worth noting that the first embodiment adds an error The amplifier 分开 separates the detection result of the voltage loop from the debt measurement result of the current loop, and since the error amplifier 55 is added, the maximum value of the output voltage Vo can be adjusted, and the lower stage of the power control circuit is lowered (eg, full The voltage stress of the bridge is changed, so that the circuit of the latter stage does not need to use the component that is resistant to high, and the cost of the circuit is reduced. In addition, the result of the debt detection by the current detecting unit 54 is directly input into the comparison H 56 instead of As is conventional, it is necessary to add the measurement and the result of the voltage detection unit 53 so that there is no problem of time delay and poor response. Referring to Figure 5, a second preferred embodiment of the power control circuit of the present invention Better implementation The difference is that the input voltage detecting unit 58 can detect the change of the wheel-in voltage %, and generate the fourth voltage signal V4 according to the detected result to control the oscillator 572. The frequency of the oscillation is that when the input voltage Vi rises (that is, when the fourth voltage signal V4 rises), the oscillation frequency of the oscillator 572 is lowered. As shown in Fig. 6(a), the input money Vi is low. When the height is high, the signal is the 200908808 signal, the dotted line of Figure 6(4) is the error output...the output is 2S 2' and the solid line is the current detection unit 54. The signal V3' is shown in Figure 6(d). The drive signal output by the drive unit 573. Referring back to Figure 5, the input voltage detecting unit 58 includes a resistor R6 and a seventh resistor R7, and x罘, the resistor R0 and the seventh resistor R7 are connected in series and electrically connected to the input voltage Vi! Vi is connected in parallel, and the input voltage detecting unit 58 multiplies the overvoltage across the seventh resistor r? by a ratio kb to obtain the fourth voltage signal V4. Referring to FIG. 7 ′, the third preferred embodiment of the power control circuit of the present invention differs from the first embodiment in that it further includes an input voltage detecting unit, and the input voltage detecting unit 59 can detect the input voltage vi. Changing, and generating a fifth voltage signal V5 according to the detected result. One end of the comparator 56 receives the sum of the fifth voltage signal V5 and the third voltage (four) V3 output by the current detecting unit 54, and the other end receives the second voltage signal V2. As shown in FIG. 8(a), when the input voltage Vi changes from low to high, the broken line of FIG. 8(b) is the second voltage signal V2 outputted by the error amplifier 55, and the solid line of FIG. 8(b) is the fifth voltage. The sum of the signal V5 and the third voltage signal V3, and FIG. 8(c) illustrates the driving signal that the driving unit 573 rotates. Referring back to FIG. 7, the wheel-in voltage detecting unit 59 includes an eighth resistor R8 and a ninth resistor R9, and the eighth resistor R8 and the ninth resistor R9 are connected in series and connected in parallel with the input voltage Vi, and input. The voltage detecting unit 59 multiplies the voltage across the ninth resistor R9 by a ratio kb to obtain the 12th 200908808 five-voltage signal V5. Referring to FIG. 9, a fourth preferred embodiment of the power control circuit of the present invention is similar to the preferred embodiment, except that the fifth voltage signal 加 is summed with an electrical signal and the summed signal is sent to the user. The error amplification is 55 〇°, and the signal of the fourth preferred embodiment can be referred to FIG. 1A, and FIG. 1(4) is the signal outputted by the error amplifier when the input power M Vi changes from low to high. V2, and the solid line of the figure is the third electrical repeating signal v3, and FIG. 10(〇) illustrates the driving signal that the driving unit 573 rotates. Referring to the U, a fifth preferred embodiment of the power control circuit of the present invention differs from the preferred embodiment in the voltage converter of the fifth embodiment, a boost DC-DC voltage converter. Referring to FIG. 12, a sixth preferred embodiment of the power control circuit of the present invention is similar to the preferred embodiment, except that the voltage converter of the sixth embodiment is a forward (f0rward) DC_DC electric grinder converter. . The load circuit 51 includes a transformer τ, two diodes d, an inductor and a capacitor C. Referring to FIG. 13 ′, a seventh preferred embodiment of the power control circuit of the present invention is similar to the first preferred embodiment, except that the voltage conversion 15 of the seventh embodiment is a type of returning type called DC/DC voltage. converter. And the load circuit 51 includes a transformer T, a diode 0 and a capacitor C. Referring to FIG. 14, an eighth preferred embodiment of the power control circuit of the present invention is similar to the first preferred embodiment. The place is in the eighth embodiment of the electric 13 200908808 St. converter 种 - push-pull (push_pull) DC. DC voltage converter. The load circuit 51 includes a transformer τ, two diodes 〇, an inductor L and a capacitor c, and the power switch unit 52 includes two switches controlled by the drive unit 573. Referring to FIG. 15, a ninth preferred embodiment of the power control circuit of the present invention is similar to the first preferred embodiment, except that the voltage converter in the ninth embodiment is a half bridge (dc bdc) DC voltage. converter. The load circuit 51 includes a transformer T, two diodes D, an inductor L and two capacitors 匚. Referring to Figure 16, a tenth preferred embodiment of the power control circuit of the present invention is similar to the first preferred embodiment, except that the voltage converter of the tenth embodiment is a full bridge-bHdge) DC-DC voltage. converter. The load circuit 51 includes a transformer τ, two diodes d, _ inductors and two capacitors c, and the power switch unit 52 includes four switches controlled by the drive unit 573. Referring to Figure 17, an eleventh preferred embodiment of the power control circuit of the present invention is similar to the first preferred embodiment, except that the power conversion in the eleventh embodiment is a buck_M (buek_bQ) Referring to Figure 18, a twelfth preferred embodiment of the power control circuit of the present invention is similar to the first preferred embodiment, except that the voltage converter of the twelfth embodiment is A low-side (1〇w_side) step-down DC-DC voltage converter. In this embodiment, the voltage detecting unit 53 is a differential amplifier, and the differential amplifier includes an amplifying unit A1 and two first Resistor ri, and two 14 200908808 second resistor r2, the positive input terminal and the negative input terminal of the early 兀A1 are connected to the two ends of the load R, and the amplifying unit 1 is input Also through them - the second resistors are electrically connected to the ground, and (4) = early: the negative input end of A1 is also electrically connected to the output terminal of the other - second resistor R2. The output of the amplification unit A1 is the output The younger brother is willing to go to the ancient shop · ° ' and the value of the first voltage signal VI is V1 = (R2 / R1) * V o. It is worth noting that the other embodiments of the electric (four) measuring unit 53, 53, and the input electric (four) measuring ... 8, 59 are implemented by a light coupling, a voltage conversion state or an operational amplifier, and the mine Furthermore, other implementations of the motor detection unit 54 are implemented by a current converter or an operational amplifier. Referring to Figures 19 and 3', the embodiment of the electronic ballast of the present invention is suitable for a drive-lamp 9b includes a rectifier circuit %, a converter circuit 94, and a power control circuit 92 of any of the above embodiments. The rectifier circuit 93 rectifies the commercial AC voltage and outputs a DC input voltage Vi. 94 is electrically connected to the lamp 91 to drive the lamp 91. The power control circuit 92 is electrically connected between the rectifier circuit % and the converter circuit 94. The power switch unit of the power control circuit 92 receives the input. The voltage Vi, and switchably, supplies the input voltage % to the load circuit 51' and the load circuit 51 generates an output voltage % to the load. The load R is the commutation circuit 94 and the lamp 91. Said that in the present invention because of joining The error amplification is $ Μ, and the output voltage of the maximum 15 200908808 can be adjusted to reduce the voltage stress after the power control circuit, thereby reducing the cost of the circuit. In addition, the detection result of the current detecting unit 54 is directly The comparator 56 is input, so that there is no problem of time delay. θ is only the preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto. The simple equivalent changes and (4) of the patent scope and the description of the invention are still within the scope of the patent of the invention. [Simplified description of the drawings] Fig. 1 is a circuit diagram of a conventional electronic ballast; FIG. 3 is a circuit diagram of a preferred embodiment of the power control circuit of the present invention, and the signal curve of the example of FIG. 4(4) shows that the dotted line of the output voltage (8) is the second „signal and the solid line 4(4) is a driving signal; (4) 5旒, and FIG. 5 is a signal curve of the second preferred embodiment of the second preferred embodiment of the power control circuit of the present invention, FIG. 6__ The round is made into (4) and the dotted line of ι... () is the second _ and the solid line of Figure 6(4) is the third voltage signal, 'Figure 7 County Taigong ηη () is the driving signal; 8(a) of the third preferred embodiment of the control circuit is an input voltage. FIG. 8 is a signal curve 16 200908808 of the third preferred embodiment, and a broken line of FIG. 8(b) is a second voltage signal. Figure 3 is a sum of the fifth voltage signals, and Figure 8 (4) is the third voltage signal of the drive (four); and Figure 9 is a circuit diagram of the fourth preferred embodiment of the power control circuit of the present invention. Figure 10 is a fourth preferred embodiment. The signal curve of the example, the dotted line of FIG. 10 (8) is the error amplifier a and the two electric three voltage signals, and the figure is the driving signal; and the solid line is the circuit diagram of the fifth preferred embodiment of the power control circuit of the present invention. Figure 12 is a circuit diagram of a sixth preferred embodiment of the power control circuit of the present invention. Figure 13 is a circuit diagram of a seventh preferred embodiment of the power control circuit of the present invention; The eighth preferred embodiment of the power control f-path is the first of the power (four) circuits of the present invention. 16 is a circuit diagram of a circuit embodiment of a circuit embodiment of a power control circuit according to a tenth preferred embodiment of the present invention; The electrogram 18 of the embodiment is a tenth road diagram of the power control circuit of the present invention, and FIG. 19 is a block diagram of the electronic ampule of the present invention - an embodiment of the block 17 200908808 [Description of main component symbols] 51... ... load circuit Vo... ...output voltage 52......... Power switch unit VI ··....first voltage signal 521 ....... control input unit V2 •.... Two voltage signals 53 ' 535 · Voltage detection unit V3 ••... Third voltage signal·«·*»«··« Current detection unit V4 ••...fourth voltage signal 55....... .. error amplifier V5 ····, ... fifth voltage signal 56...... comparator Vref · · ... reference voltage 57......... drive module R... .... ...load 571 ....... Latch unit R1 ••...first resistor 572 ....... oscillator R2 ••...second resistor 573 ...... Drive unit R3 •... ...the third resistor 58,59 ·. Input voltage detection single R4 •...·...the fourth resistance element R5 ••...the fifth resistance A1,A2 ·the amplification unit R6 ••...the sixth resistance L.... ...... Inductor R7 ..... ... seventh resistor D.......... Diode R8 ···., ...the eighth resistor Ό 〇..... .. ........ 电谷 lx y ... Le few % P and Vi...... Input voltage T....... ...Transformer 18