200917638 -九、發明說明： .【發明所屬之技術領域】 . 本發明係關於一種電源電路及其控制 【先前技術】 ㈣方法。 隨著電子產品使用之日益廣泛 受到青睞。然，作為兩早吝… 犯耗之電子產品逐漸 較大。 成。卩份之電源電路能耗 明參閱圖1 ’其係—種先前技術電 圖。該電源電路1包括-第-輸人端2 路結構框 一繼電器4、-主電源5、-副電源6、—端3、 關8。該副電源6包括， ：益7及-開 示）。 整流濾波電路（未標 該第-輪入端2電連接該主電源5 二 由忒繼電器4電連接該主電源5， 半 輪入端3經 (圖未示）。該第_、第 ；^电源5電連接—負裁 9之初級線圈(未標示)之二端，該變㈣接該變堡器 示）經由該整流濾波電 11之-人級線圈（未標 電感線圈（未標示）—端接H㈣處理器該繼電器4之 該電源電路；二=理二端電連接該微處理器7。 -交流電壓經由該第―、第二輸 =，且經由該副電源6之_ 敕電源 轉換為直流電壓，該直产+2流濾波電路而. 處理器7處於上電狀態「於該微處理器7’使讀微 該微處理器7上雷德，桌社m二 電後胃使用者藉由該開關8產生〜開 200917638 ‘號=微處理器7時’該微處理器7根據該開機脈 控制訊號至該繼電器4,使該繼電器4處於導通 .狀悲。此時，該第一、第-趴 守 5 π —輪入鳊2、3輸入之交流電壓加 ί電源=，t=;電源5處理後為該負載供電 號至該微處理n 7時，外^由销關8產生—關脈衝訊 處理器7根據該關機脈衝訊號發 電壓輸出，該負載停,卜τ你 研闹忒主电源5無 :狀態。 、 作，此時，該電源電路2處於待機 然’由於該第一、第-鈐 提供上電電壓至該微處理·；ν^ 3始終經由該副電源6 _6之變壓器有電壓加載至該 因此，即使該電亀二：'源6之變壓器9能耗較大， 【發明内容】礙1處於待機狀態時，其能耗仍然較大。 要。有姐於&提供一種減小待機能耗之電源電路實為必 實為2於此’提供—種減小待機能耗之電源電路控制方法 一種電源電路，其向負載# 控制電路、一微處理哭及H欠 電路、一待機 電路輸入之電壓進行轉換該主電路用於將外部 路之工作狀態。該微處理 衩制該主电 並根據該負載之工作狀^二接二：主電路輸出之電壓， 路。_能電路用於提供該待機控制電路所需之能量= 8 200917638 .負載由工作狀態進入停止工作狀態時，該微處理器發送控制 . 訊號至該待機控制電路，從而使該待機控制電路控制該主電 . 路關閉，該主電路關閉後，該儲能電路向該待機控制電路提 供控制該主電路再次開啟所需之能量；當該負載由停止工作 狀態進入工作時，該待機控制電路控制該主電路正常工作， 該主電路輸出之電壓向該儲能電路充電。 一種電源電路控制方法，其包括如下步驟：提供一主電 路’該主電路接收輸入該電源電路之電壓訊號，並轉換該電 壓訊號，該轉換後之電壓訊號提供給一微處理器以使該微處 理器上電；該微處理器接收該上電後，根據該主電路之負載 之工作狀態，發送控制訊號於一待機控制電路，使該負載停 止工作時，該待機控制電路控制該主電路關閉；提供一儲能 電路’當該主電路關閉後’該儲能電路向該待機控制電路提 供控制該主電路再次開啟所需之能量。 與先前技術相比，本發明電源電路之微處理器接收該主 電路輸出之電壓，並提供控制訊號於該待機控制電路，使該 X. 負載停止工作時，該待機控制電路提供控制訊號於該主電 路，以使該主電路關閉。由於該主電路關閉後’該儲能電路 向該待機控制電路提供控制該主電路再次開啟所需之能 量，因此，該電源電路能耗降低。 【實施方式】 請參閱圖2，係本發明電源電路之第一實施方式之電路 結構框圖。該電源電路20包括一第一、第二輸入端211、 212、一能量獲取電路22、一整流濾波電路23、一待機指示 9 200917638 — 電路24、一儲能電路25、一主電路26、一待機控制電路27、 -一微處理器28及一待機偵測電路29。 , 該第一、第二輸入端211、212分別係交流電壓之活線 (Live Line)輸入端與零線(Null Line)輸入端。該第一、第二 輸入端211、212輸入之交流電壓經由該整流濾波電路23整 流濾波後，於該整流濾波電路23之輸出端231輸出一直流 電壓至該主電路26。該第一、第二輸入端211、212輸入之 交流電壓還提供能量給該能量獲取電路22。 該主電路26接收該整流濾波電路23輸出端231輸出之 直流電壓，並將該直流電壓轉換後，經由該主電路26之第 一，第二輸出端260、261向該微處理器28供電。例如：該 主電路將該整流濾波電路23輸出之直流電壓轉換為26 V和 5V，該26V和5V電壓分別由該主電路26之第一，第二輸 出端260、261端輸出。該主電路26同時藉由該主電路26 之第一，第三輸出端260、262向該能量獲取電路22供電。 該能量獲取電路22分別從該電源電路20之第一、第二 輸入端211、212、該主電路26之第一、第三輸出端260、 262獲取電壓，並於該能量獲取電路22之輸出端221分別提 供電壓於該待機指示電路24及該儲能電路25。 該待機指示電路24分別從該能量獲取電路22之輸出端 221及該主電路26之第一輸出端260接收電壓以顯示該主電 路26之工作狀態。 該儲能電路25接收並儲存自該能量獲取電路22輸出端 221傳遞之電能，並於該儲能電路25之輸出端251提供該待 10 200917638 . 機控制電路27控制該電源電路20開/關所需之能量。 • 該待機偵測電路29藉由該待機偵測電路29之輸入端 .291偵測負載（圖未示）之訊號電壓，以判斷該電源電路20是 否進入待機狀態，並經由待機偵測電路29之第一、第二輸 出端292、293分別發送控制訊號至該微處理器28及該待機 控制電路27。 該微處理器28接收並分析該待機偵測電路29之第一輸 出端292、該待機控制電路27之第二輸出端272發送之控制 訊號。依據該控制訊號，該微處理器28藉由其第一、第二 輸出端281、282分別發送相應控制訊號至該待機控制電路 27，其第三輸出端283用於控制該負載之工作。 該待機控制電路27接收該儲能電路25之輸出端251輸 出之電壓，使該待機控制電路27上電。該待機控制電路27 還分別接收該微處理器28之第一、第二輸出端281、282及 該待機偵測電路29之第二輸出端293發出之控制訊號，並 藉由其第一輸出端271控制該主電路26之工作狀態。該待 \ 機控制電路27根據使用者發出之操作訊號，藉由其第二輸 出端272發送控制訊號至該微處理器28。 請一併參閱圖2、圖3，其中圖3係圖2所示主電路26 之内部電路示意圖。該主電路26係一開關電源電路，其包 括一變壓器263、一開關控制電路（Switch IC)264、一電晶體 265及一反饋電路266。該變壓器263包括一初級線圈267 及一次級線圈268，其中該初級線圈267 —侧為該變壓器263 之初級端，該次級線圈268 —側為該變壓器263之次級端。 11 200917638 . 通常，該變壓器263初級端之接地電壓不為0，而其次級端 . 之接地電壓為0，因此，當一電子元件電連接該變壓器263 , 初級端之接地端時，定義該電子元件初級端接地。在下文 中，用接地表示該電子元件接地電壓為0，用初級端接地表 示該電子元件電連接該變壓器263初級端之接地端。 該初級線圈267之一端經由該電晶體265及一電阻（未 標示）而初級端接地，該變壓器263初級端之接地端定義為 該主電路26之第三輸出端262。該次級線圈268 —端藉由一 整流濾波電路（未標示）電連接至該主電路26之第一輸出端 260,該次級線圈268之一抽頭端（未標示）藉由另一整流濾波 電路（未標示）電連接至該主電路26之第二輸出端261，該次 級線圈268之另一端接地。因此，該主電路26之輸入電壓 經由該變壓器263分壓而輸出兩種不同電壓，例如：26V、 5V。該開關控制電路264電連接該待機控制電路27之第一 輸出端271，以接收該待機控制電路27發出之控制訊號。該 反饋電路266電連接於該主電路26之第二輸出端261與該 開關控制電路264之間，以將該主電路26之輸出電壓反饋 至該開關控制電路264。該開關控制電路264控制該電晶體 265之導通時間以調整該第一、第二輸出端260、261輸出之 電壓。 請一併參閱圖2、圖4，其中圖4係圖2所示能量獲取 電路22及儲能電路25之内部電路示意圖。該儲能電路25 包括一儲能電容，該儲能電容一端接地，其另一端電連接該 能量獲取電路22之輸出端221。 12 200917638 . 該能量獲取電路22包括一大能量獲取電路222及第 .一、第二、第三微能量獲取電路223、224、225。該大能量 . 獲取電路222及該第一、第二、第三微能量獲取電路223、 224、225之輸出端均連接該能量獲取電路22之輸出端221。 該大能量獲取電路222從該主電路26之第一輸出端260 獲取能量，其包括一二極體（未標示），該二極體之正極電連 接該主電路26之第一輸出端260，其負極電連接該能量獲取 電路22之輸出端221。 該第一、第二微能量獲取電路223、224分別從該電源 電路20之第一、第二輸入端211、212獲取能量。該第一、 第二微能量獲取電路223、224電路結構相同。該第一、第 二微能量獲取電路223、224之輸入端分別電連接該電源電 路20之第一、第二輸入端211、212。該第一微能量獲取電 路223包括第一、第二電容（未標示）及第一、第二二極體（未 標示）。該電源電路20之第一輸入端211經由該第一電容電 連接該第一二極體之正極，該第一二極體之負極電連接該能 量獲取電路22之輸出端221。該第二電容與該第二二極體組 成一並聯電路，且該第二二極體之正極接地，其負極電連接 該第一二極體之正極。 該第三微能量獲取電路225從該主電路26之變壓器263 之初級接地端，即該主電路26之第三輸出端262獲取能量。 該第三微能量獲取電路225之輸入端電連接該主電路26之 第三輸出端262。該第三微能量獲取電路225之内部電路與 該第一微能量獲取電路223相似，不同之處在於：該第三微 13 200917638 . 能量獲取電路225之第一電容還可為一電阻或電感。 . 當該主電路26工作時，該大能量獲取電路222及該第 一、第二、第三微能量獲取電路223、224、225同時向該儲 ψ 能電路25之儲能電容供電。當該主電路26處於待機狀態 時，僅該第一、第二、第三微能量獲取電路223、224、225 向該儲能電容供電。 請一併參閱圖2、圖5，其中圖5係圖2所示待機指示 電路24之内部電路示意圖。該待機指示電路24包括一電容 241、一第一電晶體242、一第二電晶體243、一發光二極體 244及一穩壓管245。該第一電晶體242係一 PNP型雙極電 晶體，該第二電晶體243係一 NPN型雙極電晶體。 該第一電晶體242之射極經由依次串接之一電阻（未標 示）及一二極體（未標示）之負、正極電連接該能量獲取電路 22之輸出端221。該第一電晶體242之射極同時經由該電容 241接地。該第一電晶體242之集極經由該發光二極體244 之正極、負極接地。該第一電晶體242之基極經由一電阻（未 k — 標示）電連接其射極，該基極同時經由另一電阻（未標示）電連 接該第二電晶體243之集極，該基極還依次經由一二極體 (未標示）之負、正極電連接該主電路26之第一輸出端260。 該第二電晶體243之射極接地，其基極經由該穩壓管245之 正極、負極電連接該第一電晶體242之射極。 當該主電路26處於工作狀態時，其第一輸出端260之 電壓（例如：26V)加載至該第一電晶體242之基極，該第一 電晶體242截止，該發光二極體244不發光。 14 200917638 當該主電路26處於待機狀態時，該主電路26之第一輸 出端260無電壓輸出，該能量獲取電路22經由其輸出端221 對該電容241充電。當該電容241兩端電壓充電到一定值 時，該穩壓管245導通，進而使該第二電晶體243導通，該 第一電晶體242之基極拉為低電位，從而該第一電晶體242 導通，該電容241經由該第一電晶體242及該發光二極體244 放電，該發光二極體244發光。 當該電容241兩端電壓放電到一定值時，該第一電晶體 242、第二電晶體243同時截止，該發光二極體244停止發 光，該能量獲取電路22之第一、第二、第三微能量獲取電 路223、224、225向該電容241再次充電，當該電壓電容241 兩端電壓達到一定值後，該發光二極體244再次發光。因此， 當該主電路26處於待機狀態時，該電容241不斯充、放電， 從而該發光二極體244不斷閃爍，以顯示該電源電路20處 於待機狀態。 請一併參閱圖2、圖6,其中圖6係圖2所示待機控制 電路27之内部電路示意圖。該待機控制電路27包括一開關 273、一正反器274、一電晶體275、一光耦276及一反向器 277。該開關273係使用者手動控制該電源電路20之元件， 其可為觸摸式開關（Touch Switch)、單向開關或雙向開關。該 電晶體275係一 NPN型雙極電晶體，該電晶體275亦可為 金屬氧化物半導體場效電晶體。 該開關273之一端接地，另一端電連接該正反器274， 同時經由一二極體（未標示）之負、正極電連接該待機控制電 15 200917638 •.路27之第二輪出端272,並經由該第二 •微處理器28。該電晶體275之基極電迷拯：272電連接該 ‘射極經由該光輕276之接地，其集極=反器274,其 該集極同時經由一二極體（未標示）之負、正/正反器274， 電路25之輪出端251，因此，該儲能電路25^電連接該儲能 及該電晶體275供電。該反向器277之輪入=該正反器274 之次級端初級端接地，該反向器2 7 ^由該光轉2 7 6 制雷踗27夕钕 ^ , 出^電連接該待機控 制屯路27之名一輸出端271’並經由該 to 4 违* 干⑴出端271電連 接忒主電路26之開關控制電路264。 ^亥正反器274及該電晶體275之基極分別經由一二極體 (未標不）之負、正極電連接該微處理器28之第―、第二輸出 端281 282。5玄正反盗274還電連接該待機谓測電路μ之 第二輸出端293。 請一併參閱圖2至圖6,該電源電路20之運作原理如下： 、當該電源電路2〇之第一、第二輸入端211、212輸入交 (流電壓後，該交流電壓經由該整流濾波電路23整流濾波後 加載至該主電路26之變壓器263之初級線圈26?。 當使用者要打開該電源電路2Q時，其按下該待機控制 電路27之開關273，該開關273產生一觸發脈衝，該觸發脈 衝使該正反器274對應產生一開機脈衝訊號至該電晶體275 之基極’该電晶體275導通。該儲能電路25之電壓依次經 由其輸出端251及該電晶體275加載於該光耦276之初級 端，從而使該光耦276之初級端、次級端依次導通，該反向 器277之輸入端電位拉為低電位。該反向器277之輸出端經 16 200917638 由該待機控制電路27之第一輸出端271輸出一高電壓訊號 使該主電路26之開關控制電路264開始工作。該開關控制 電路264控制該主電路26之電晶體265之導通時間，從而 使該主電路26之第一、第二輸出端260、261輸出電壓，進 而使該微處理器28控制該負載之工作。同時，該微處理器 28經由其第一、第二輸出端281、282分別發送控制訊號至 該待機控制電路27之正反器274及電晶體275,以鎖定該正 反器274及電晶體275之工作狀態。 當使用者要關閉該電源電路20時，使用者再次按下該 待機控制電路27之開關273，該開關273產生一關機脈衝訊 號至微處理器28。該微處理器28根據該關機訊號，於該微 處理器28之第二輸出端282加載一低電位於該待機控制電 路27之電晶體275基極，該電晶體275截止，進而使該光 _禺276截止。該反向器277之輸入端電位拉為南電位’該反 向器277之輸出端經由該待機控制電路27之第一輸出端271 輸出一低電壓訊號使該主電路26之開關控制電路264停止 工作，進而該變壓器263停止工作。該主電路26之第一、 第二輸出端260、261無電壓輸出，該待機指示電路24之發 光二極體244開始閃爍，且該微處理器28及負載停止工作。 該微處理器28解除對該待機控制電路27之正反器274之鎖 定。 當該電源電路20用於液晶顯示器時，該負載可為液晶 面板、逆變器（Inverter)及通用串行總線（Universal Serial Bus， USB)接口等其他用電元件。下面以該負載為液晶面板為例， 17 200917638 ，.說明該電源電路20之待機原理： ， 當該電源電路20正常工作時，該待機偵測電路29經由 .其輸入端291彳貞測輸入該液晶面板之電壓訊號，例如：數位 視訊介面（Digital Visual Interface，DVI)訊號、視頻圖像陣列 (Video Graphics Array，VGA)接口訊號、高清晰度多媒體介面 (High Definition Multimedia Interface，HDMI)訊號之訊號電 壓。若該待機偵測電路29沒有偵測到該訊號電壓，其發送 ' """*待機訊號至该微處理益2 8 ’该微處理|§ 2 8根據該待機訊 號，於其第二輸出端282加載一低電位於該待機控制電路27 之電晶體275 ’該電晶體275截止，進而使該光輕276截止， 該反向器277之輸入端電位拉為高電位，該反向器277之輸 出端藉由該待機控制電路27之第一輸出端271輸出一低電 壓訊號使該主電路26之開關控制電路264停止工作，進而 該變壓器263停止工作。該主電路26之第一、第二輸出端 260、261無電壓輸出，該待機指示電路24之發光二極體244 ；： 開始閃爍，以指示該電源電路20處於待機狀態，同時該微 處理器28停止工作。此時，該微處理器28解除對該待機控 制電路27之正反器274之鎖定。 該電源電路20進入待機狀態後，若該待機偵測電路29 經由其輸入端291偵測到輸入該液晶面板之電壓訊號，該待 機偵測電路29藉由其第二輸出端293發送一脈衝訊號使該 待機控制電路27之正反器274產生一開機脈衝訊號至該電 晶體275之基極，該電晶體275導通。該儲能電路25之輸 出端251加載電壓於該光耦276之初級端，從而使該光耦276 18 200917638 之初級端、次級端依次導通，該反向器277之輸出端拉為低 電位。該反向器277之輸出端藉由該待機控制電路27之第 一輸出端271輸出一高電壓訊號使該主電路26之開關控制 電路264開始工作，從而使該主電路26之第一、第二輸出 端260、261輸出電壓，進而該微處理器28控制負載之工作。 該微處理器28同時經由其第一、第二輸出端281、282發送 控制訊號，以鎖定該待機控制電路27之正反器274及電晶 體275之工作狀態。 與先前技術相比，本發明之電源電路20在進入關機或 待機狀態時，該主電路26停止工作，因此，該電源電路20 較先前技術之電源電路能耗降低。該電源電路20還可藉由 該待機控制電路27偵測該負載之工作狀態，若負載停止工 作，則該電源電路20自動進入待機狀態，從而使該主電路 26停止工作，該電源電路20之能耗更加降低。 與先前技術相比，本發明之電源電路20經由該能量獲 取電路22向該儲能電路25供電。當該電源電路20在進入 關機或待機狀態時，該第一、第二、第三微能量獲取電路 223、224、225向該儲能電路25供電，而該電源電路20正 常工作時，該大能量獲取電路222亦向該儲能電路25供電， 因此，加快了該儲能電路25充電之速度。同時，經由該待 機指示電路24之發光二極體244之是否閃爍，使用者可以 更清楚的判斷該電源電路20之工作狀態。 請參閱圖7，係本發明電源電路之第二實施方式之電路 結構框圖。該電源電路30與該電源電路20之區別在於：該 19 200917638 電源電路30之第一輸入端311電連接該整流濾波電路％， 其第二輸入端312藉由一繼電器313電連接該整流濾波電路 33。當該電源電路30進入關機或待機狀態時，該待機栌制 電路37發送控制訊號使該繼電器313斷開，使該電源電路 30之主電路36停止工作，以達到降低能耗之目的。 綜上所述’本發明確已符合發明之要件，爰依法 利申請。惟’以上該者僅為本發明之較佳實施方式 之範圍並不以上述實施方式為限，舉凡熟悉本案技二 ^依本發明之精神所作之等效修飾或變化，皆應 申請專利範圍内。 盈於以下 【圖式簡單說明】 圖1係-種先前技術電源電路之電路結構框圖。 圖2係本發明電源電路n施 圖3係圖2所示主電路之内部電路示意圖、、4框圖。 圖4係圖2心能量獲取電路及儲 圖。 <円部電路示意 圖5係圖2所示待機指示電路 圖6在同Ο Μ _ & η 1 1 I路不意圖。 Μ係圖2所不待機控制電路 立口 路結構框圖 圖7係本發明電源電路 ^圖。 r , ^ 木―貝、知方式之畲 L主要元件符號說明】 电 電源電路 20、30裳^ 211、 311 22、32 大能量獲取電路222 第二輪入端 212、319輸入端 輸出端 221 2能量獲取電略 第—微能量獲取電路 20 223 200917638 . 第二微能量獲取電路 . 第三微能量獲取電225 輸出端 231 電容 241 第二電晶體 243 穩壓管 245 輸出端 251 第一輸出端 260 第三輸出端 262 開關控制電路 264 反饋電路 266 次級線圈 268 第一輸出端 271 開關 273 電晶體 275 反向器 277 第一輸出端 281 第三輸出端 283 輸入端 291 第二輸出端 293 224 整流濾波電路 23 待機指不電路 24 第一電晶體 242 發光二極體 244 儲能電路 25 主電路 26、36 第二輸出端 261 變壓器 263 電晶體 265 初級線圈 267 待機控制電路 27、37 第二輸出端 272 正反器 274 光耦 276 微處理器 28 第二輸出端 282 待機偵測電路 29 第一輸出端 292 繼電器 313 21200917638 - IX, invention description: [Technical field to which the invention belongs] The present invention relates to a power supply circuit and its control [Prior Art] (4) Method. As electronic products become more widely used, they are favored. However, as two mornings... The electronic products that are being consumed are gradually larger. to make.卩 Power supply circuit power consumption See Figure 1 ''system'' for a prior art electrogram. The power supply circuit 1 includes a -first-input terminal 2-way structure, a relay 4, a main power supply 5, a secondary power supply 6, a terminal 3, and a switch 8. The secondary power source 6 includes: benefits 7 and - display). The rectifying and filtering circuit (not including the first-wheel-in terminal 2 is electrically connected to the main power source 5, and the relay 4 is electrically connected to the main power source 5, and the half-wheel-in terminal 3 is connected (not shown). The _, _, ^ The power supply 5 is electrically connected - the second end of the primary coil (not shown) of the negative cut 9 is changed, and the change (4) is connected to the changer (the changer is shown) through the rectification filter 11 - the human-level coil (not labeled (not labeled) - Terminating the power circuit of the relay 4 of the H (four) processor; the second terminal is electrically connected to the microprocessor 7. - the alternating voltage is converted by the first and second outputs, and is converted by the power supply of the secondary power source 6 For the DC voltage, the direct output + 2 stream filter circuit. The processor 7 is in the power-on state "at the microprocessor 7' so that the microprocessor 7 is read on the microprocessor 7, the stomach user The switch 8 generates ~open 200917638 'number=microprocessor 7'. The microprocessor 7 sends the relay 4 to the relay 4 according to the start pulse control signal. The relay 4 is turned on. At this time, the first , - 趴 5 π - turn in 鳊 2, 3 input AC voltage plus ί power =, t =; power supply 5 after the power supply for the load When the micro-processing n 7 is performed, the external signal is generated by the pin-off switch 8 - the pulse-pulsing processor 7 outputs a voltage according to the shutdown pulse signal, and the load is stopped, and the τ 你 研 研 忒 忒 main power supply 5 is not: state. At this time, the power supply circuit 2 is in standby state because the first and the first power supply voltages are supplied to the micro-processing, and the voltage is always applied to the transformer via the power supply of the secondary power supply 6_6, even if the Electric 亀 2: 'Source 6 transformer 9 energy consumption is large, [Invention content] When 1 is in standby state, its energy consumption is still large. Yes, there is a power supply circuit that reduces standby energy consumption. It is really necessary to provide a power supply circuit for reducing the standby power consumption. The power supply circuit converts the voltage of the load # control circuit, a micro-processing crying and H-under circuit, and a standby circuit input. The main circuit is used for the working state of the external circuit. The micro-processing controls the main power and according to the working condition of the load, the voltage is outputted by the main circuit, and the circuit is used to provide the standby control circuit. Required energy = 8 200917638 . Load When the working state enters the stop working state, the microprocessor sends a control signal to the standby control circuit, so that the standby control circuit controls the main power circuit to be closed, and after the main circuit is turned off, the energy storage circuit goes to the standby control The circuit provides energy required to control the main circuit to be turned on again; when the load enters operation from the stop state, the standby control circuit controls the main circuit to operate normally, and the voltage outputted by the main circuit charges the storage circuit. The circuit control method includes the following steps: providing a main circuit, the main circuit receiving a voltage signal input to the power circuit, and converting the voltage signal, the converted voltage signal being supplied to a microprocessor to enable the microprocessor After receiving the power-on, the microprocessor sends a control signal to a standby control circuit according to the working state of the load of the main circuit, so that the standby control circuit controls the main circuit to be turned off; a storage circuit 'when the main circuit is turned off', the energy storage circuit provides control to the standby control circuit The main circuit is turned on again to turn on the required energy. Compared with the prior art, the microprocessor of the power circuit of the present invention receives the voltage outputted by the main circuit and provides a control signal to the standby control circuit, so that the standby control circuit provides a control signal when the X. load is stopped. The main circuit is to turn off the main circuit. Since the main circuit is turned off, the energy storage circuit supplies the standby control circuit with the energy required to control the main circuit to be turned on again, so that the power supply circuit consumes less power. [Embodiment] Please refer to Fig. 2, which is a circuit block diagram of a first embodiment of a power supply circuit of the present invention. The power circuit 20 includes a first and second input terminals 211, 212, an energy harvesting circuit 22, a rectifying and filtering circuit 23, a standby indicator 9 200917638 - a circuit 24, a storage circuit 25, a main circuit 26, and a The standby control circuit 27, a microprocessor 28 and a standby detection circuit 29. The first and second input terminals 211 and 212 are respectively a Live Line input terminal and a Null Line input terminal. The AC voltage input to the first and second input terminals 211, 212 is filtered by the rectifying and filtering circuit 23, and then the DC voltage is outputted to the main circuit 26 at the output terminal 231 of the rectifying and filtering circuit 23. The AC voltage input by the first and second input terminals 211, 212 also provides energy to the energy harvesting circuit 22. The main circuit 26 receives the DC voltage outputted from the output terminal 231 of the rectifying and filtering circuit 23, and converts the DC voltage to supply power to the microprocessor 28 via the first and second output terminals 260, 261 of the main circuit 26. For example, the main circuit converts the DC voltage output from the rectifying and filtering circuit 23 into 26 V and 5 V, and the 26 V and 5 V voltages are respectively output from the first and second output terminals 260 and 261 of the main circuit 26. The main circuit 26 simultaneously supplies power to the energy harvesting circuit 22 via the first and third output terminals 260, 262 of the main circuit 26. The energy acquisition circuit 22 obtains voltages from the first and second input terminals 211 and 212 of the power supply circuit 20 and the first and third output terminals 260 and 262 of the main circuit 26, respectively, and outputs the output of the energy acquisition circuit 22. Terminal 221 provides a voltage to the standby indicating circuit 24 and the tank circuit 25, respectively. The standby indicating circuit 24 receives voltages from the output terminal 221 of the energy harvesting circuit 22 and the first output terminal 260 of the main circuit 26 to display the operating state of the main circuit 26. The energy storage circuit 25 receives and stores the electrical energy transmitted from the output end 221 of the energy harvesting circuit 22, and provides the standby 10 200917638 at the output end 251 of the energy storage circuit 25. The machine control circuit 27 controls the power circuit 20 to turn on/off. The energy needed. The standby detection circuit 29 detects the signal voltage of the load (not shown) through the input terminal 291 of the standby detection circuit 29 to determine whether the power supply circuit 20 enters the standby state and passes through the standby detection circuit 29 . The first and second output terminals 292, 293 respectively send control signals to the microprocessor 28 and the standby control circuit 27. The microprocessor 28 receives and analyzes the control signal sent by the first output 292 of the standby detection circuit 29 and the second output 272 of the standby control circuit 27. According to the control signal, the microprocessor 28 sends corresponding control signals to the standby control circuit 27 via its first and second output terminals 281, 282, respectively, and its third output terminal 283 is used to control the operation of the load. The standby control circuit 27 receives the voltage output from the output terminal 251 of the tank circuit 25, and powers up the standby control circuit 27. The standby control circuit 27 also receives the control signals from the first and second output terminals 281 and 282 of the microprocessor 28 and the second output terminal 293 of the standby detection circuit 29, respectively, and the first output terminal thereof 271 controls the operating state of the main circuit 26. The standby control circuit 27 sends a control signal to the microprocessor 28 via its second output terminal 272 according to the operation signal sent by the user. Please refer to FIG. 2 and FIG. 3 together. FIG. 3 is a schematic diagram of the internal circuit of the main circuit 26 shown in FIG. 2. The main circuit 26 is a switching power supply circuit comprising a transformer 263, a switch control circuit (Switch IC) 264, a transistor 265 and a feedback circuit 266. The transformer 263 includes a primary winding 267 and a primary winding 268, wherein the primary winding 267 is at the primary end of the transformer 263 and the secondary winding 268 is the secondary end of the transformer 263. 11 200917638 . Generally, the ground voltage of the primary side of the transformer 263 is not 0, and the ground voltage of the secondary side is 0. Therefore, when an electronic component is electrically connected to the ground end of the transformer 263, the primary end, the electron is defined. The primary side of the component is grounded. In the following, the grounding voltage of the electronic component is 0 by grounding, and the grounding end of the primary end of the transformer 263 is electrically connected by the primary end grounding. One end of the primary winding 267 is grounded via the transistor 265 and a resistor (not shown), and the ground terminal of the primary end of the transformer 263 is defined as the third output 262 of the main circuit 26. The secondary winding 268 is electrically connected to the first output end 260 of the main circuit 26 by a rectifying and filtering circuit (not shown). One of the secondary windings 268 is not tapped (not labeled) by another rectifying filter. A circuit (not shown) is electrically coupled to the second output 261 of the main circuit 26, the other end of which is grounded. Therefore, the input voltage of the main circuit 26 is divided by the transformer 263 to output two different voltages, for example, 26V, 5V. The switch control circuit 264 is electrically connected to the first output end 271 of the standby control circuit 27 to receive the control signal sent by the standby control circuit 27. The feedback circuit 266 is electrically coupled between the second output 261 of the main circuit 26 and the switch control circuit 264 to feed back the output voltage of the main circuit 26 to the switch control circuit 264. The switch control circuit 264 controls the on-time of the transistor 265 to adjust the voltage output by the first and second output terminals 260, 261. Please refer to FIG. 2 and FIG. 4 together. FIG. 4 is a schematic diagram of the internal circuit of the energy harvesting circuit 22 and the energy storage circuit 25 shown in FIG. The energy storage circuit 25 includes a storage capacitor, one end of which is grounded, and the other end of which is electrically connected to the output end 221 of the energy harvesting circuit 22. 12 200917638 . The energy harvesting circuit 22 includes a large energy harvesting circuit 222 and first, second, and third micro energy harvesting circuits 223, 224, and 225. The output of the large energy acquisition circuit 222 and the first, second, and third micro energy acquisition circuits 223, 224, and 225 are connected to the output terminal 221 of the energy acquisition circuit 22. The large energy acquisition circuit 222 obtains energy from the first output end 260 of the main circuit 26, and includes a diode (not labeled). The anode of the diode is electrically connected to the first output end 260 of the main circuit 26, Its negative electrode is electrically connected to the output terminal 221 of the energy harvesting circuit 22. The first and second micro energy harvesting circuits 223, 224 respectively extract energy from the first and second input terminals 211, 212 of the power supply circuit 20. The first and second micro energy harvesting circuits 223 and 224 have the same circuit configuration. The input ends of the first and second micro energy acquisition circuits 223 and 224 are electrically connected to the first and second input terminals 211 and 212 of the power supply circuit 20, respectively. The first micro-energy acquisition circuit 223 includes first and second capacitors (not labeled) and first and second diodes (not labeled). The first input end 211 of the power supply circuit 20 is electrically connected to the anode of the first diode via the first capacitor, and the cathode of the first diode is electrically connected to the output end 221 of the energy acquisition circuit 22. The second capacitor and the second diode form a parallel circuit, and the anode of the second diode is grounded, and the cathode of the second diode is electrically connected to the anode of the first diode. The third micro-energy acquisition circuit 225 takes energy from the primary ground of the transformer 263 of the main circuit 26, i.e., the third output 262 of the main circuit 26. The input of the third micro energy harvesting circuit 225 is electrically coupled to the third output 262 of the main circuit 26. The internal circuit of the third micro-energy acquisition circuit 225 is similar to the first micro-energy acquisition circuit 223, except that the third capacitance of the third micro 13 200917638 may also be a resistance or an inductance. When the main circuit 26 is in operation, the large energy acquisition circuit 222 and the first, second, and third micro energy acquisition circuits 223, 224, 225 simultaneously supply power to the storage capacitor of the storage circuit 25. When the main circuit 26 is in the standby state, only the first, second, and third micro energy harvesting circuits 223, 224, 225 supply power to the storage capacitor. Please refer to FIG. 2 and FIG. 5 together, wherein FIG. 5 is a schematic diagram of the internal circuit of the standby indicating circuit 24 shown in FIG. 2. The standby indicating circuit 24 includes a capacitor 241, a first transistor 242, a second transistor 243, a light emitting diode 244, and a voltage stabilizing tube 245. The first transistor 242 is a PNP type bipolar transistor, and the second transistor 243 is an NPN type bipolar transistor. The emitter of the first transistor 242 is electrically connected to the output terminal 221 of the energy harvesting circuit 22 via a negative resistor connected to one of the resistors (not shown) and a diode (not shown). The emitter of the first transistor 242 is simultaneously grounded via the capacitor 241. The collector of the first transistor 242 is grounded via the positive and negative electrodes of the LED 244. The base of the first transistor 242 is electrically connected to its emitter via a resistor (not denoted by k), and the base is simultaneously electrically connected to the collector of the second transistor 243 via another resistor (not shown). The pole is also electrically connected to the first output 260 of the main circuit 26 via a negative and positive pole of a diode (not shown). The emitter of the second transistor 243 is grounded, and the base thereof is electrically connected to the emitter of the first transistor 242 via the anode and the cathode of the Zener diode 245. When the main circuit 26 is in the working state, the voltage of the first output terminal 260 (for example, 26V) is applied to the base of the first transistor 242, the first transistor 242 is turned off, and the LED 244 is not Glowing. 14 200917638 When the main circuit 26 is in the standby state, the first output terminal 260 of the main circuit 26 has no voltage output, and the energy harvesting circuit 22 charges the capacitor 241 via its output terminal 221. When the voltage across the capacitor 241 is charged to a certain value, the Zener diode 245 is turned on, and the second transistor 243 is turned on, and the base of the first transistor 242 is pulled low, so that the first transistor 242 is turned on, and the capacitor 241 is discharged through the first transistor 242 and the LED 244, and the LED 244 emits light. When the voltage across the capacitor 241 is discharged to a certain value, the first transistor 242 and the second transistor 243 are simultaneously turned off, and the LED 244 stops emitting light. The first, second, and second of the energy acquiring circuit 22 The three micro energy acquisition circuits 223, 224, and 225 recharge the capacitor 241. When the voltage across the voltage capacitor 241 reaches a certain value, the light emitting diode 244 emits light again. Therefore, when the main circuit 26 is in the standby state, the capacitor 241 is not charged or discharged, so that the LED 244 is continuously blinking to indicate that the power circuit 20 is in the standby state. Please refer to FIG. 2 and FIG. 6, which is a schematic diagram of the internal circuit of the standby control circuit 27 shown in FIG. The standby control circuit 27 includes a switch 273, a flip-flop 274, a transistor 275, an optocoupler 276, and an inverter 277. The switch 273 is a component for the user to manually control the power circuit 20, which may be a touch switch, a one-way switch or a bidirectional switch. The transistor 275 is an NPN type bipolar transistor, and the transistor 275 can also be a metal oxide semiconductor field effect transistor. One end of the switch 273 is grounded, and the other end is electrically connected to the flip-flop 274, and the standby control unit 15 is electrically connected via a negative and positive pole of a diode (not labeled). And via the second microprocessor 28. The base of the transistor 275 is electrically connected: 272 is electrically connected to the 'electrode through the ground of the light 276, and its collector = the counter 274, the collector of which is simultaneously negative via a diode (not labeled) The positive/reverse 274, the wheel terminal 251 of the circuit 25, therefore, the tank circuit 25 is electrically connected to the energy storage and the transistor 275 is powered. The rounding of the inverter 277 = the primary end of the secondary end of the flip-flop 274 is grounded, and the reverser 2 7 ^ is rotated by the light to make a Thunder 27 The output of the circuit 27 is controlled to an output 271' and is electrically coupled to the switch control circuit 264 of the main circuit 26 via the to 4 off terminal (1). The base of the galvanic reflector 274 and the transistor 275 are respectively electrically connected to the first and second output terminals 281 282 of the microprocessor 28 via the negative and positive poles of a diode (not labeled). The anti-theft 274 is also electrically connected to the second output terminal 293 of the standby pre-measurement circuit μ. Referring to FIG. 2 to FIG. 6 , the operation principle of the power circuit 20 is as follows: when the first and second input terminals 211 and 212 of the power circuit 2 are input (current voltage, the AC voltage is rectified via the rectification) The filter circuit 23 rectifies and filters and loads the primary coil 26 of the transformer 263 of the main circuit 26. When the user wants to turn on the power circuit 2Q, it presses the switch 273 of the standby control circuit 27, and the switch 273 generates a trigger. a pulse that causes the flip-flop 274 to generate a turn-on pulse signal to the base of the transistor 275. The transistor 275 is turned on. The voltage of the tank circuit 25 sequentially passes through its output terminal 251 and the transistor 275. The primary end and the secondary end of the optocoupler 276 are sequentially turned on, and the input terminal of the inverter 277 is pulled to a low potential. The output of the inverter 277 is 16 200917638 A high voltage signal is outputted from the first output terminal 271 of the standby control circuit 27 to cause the switch control circuit 264 of the main circuit 26 to start operating. The switch control circuit 264 controls the on time of the transistor 265 of the main circuit 26, The first and second output terminals 260, 261 of the main circuit 26 output a voltage, thereby causing the microprocessor 28 to control the operation of the load. At the same time, the microprocessor 28 is via its first and second output terminals 281. The 282 sends a control signal to the flip-flop 274 and the transistor 275 of the standby control circuit 27 to lock the working state of the flip-flop 274 and the transistor 275. When the user wants to turn off the power circuit 20, the user Pressing the switch 273 of the standby control circuit 27 again, the switch 273 generates a shutdown pulse signal to the microprocessor 28. The microprocessor 28 loads a second output 282 of the microprocessor 28 according to the shutdown signal. The low power is located at the base of the transistor 275 of the standby control circuit 27, and the transistor 275 is turned off, thereby turning off the light_禺 276. The input terminal of the inverter 277 is pulled to the south potential. The output terminal outputs a low voltage signal through the first output terminal 271 of the standby control circuit 27 to stop the switch control circuit 264 of the main circuit 26, and the transformer 263 stops working. The first and second outputs of the main circuit 26 End 260 261 has no voltage output, the light-emitting diode 244 of the standby indicating circuit 24 starts to blink, and the microprocessor 28 and the load stop working. The microprocessor 28 releases the lock of the flip-flop 274 of the standby control circuit 27. When the power circuit 20 is used for a liquid crystal display, the load may be other power components such as a liquid crystal panel, an inverter, and a Universal Serial Bus (USB) interface. For example, the panel assumes the standby principle of the power circuit 20: when the power circuit 20 is working normally, the standby detection circuit 29 detects the voltage signal input to the liquid crystal panel via the input terminal 291. For example: digital video interface (DVI) signal, video image array (VGA) interface signal, high definition multimedia interface (HDMI) signal signal voltage. If the standby detection circuit 29 does not detect the signal voltage, it sends a '"""*stand signal to the micro-processing benefit 2 8 'the micro-processing|§ 2 8 according to the standby signal, in its The two output terminals 282 are loaded with a low voltage electric transistor 275' located in the standby control circuit 27, and the transistor 275 is turned off, thereby turning off the light light 276, and the input terminal potential of the inverter 277 is pulled to a high potential. The output terminal of the 277 outputs a low voltage signal through the first output terminal 271 of the standby control circuit 27 to stop the switch control circuit 264 of the main circuit 26, and the transformer 263 stops working. The first and second output terminals 260, 261 of the main circuit 26 have no voltage output, and the light-emitting diode 244 of the standby indicating circuit 24 starts to blink to indicate that the power circuit 20 is in a standby state, and the microprocessor 28 stopped working. At this time, the microprocessor 28 releases the lock of the flip-flop 274 of the standby control circuit 27. After the power supply circuit 20 enters the standby state, if the standby detection circuit 29 detects the voltage signal input to the liquid crystal panel via the input terminal 291, the standby detection circuit 29 sends a pulse signal through the second output terminal 293 thereof. The flip-flop 274 of the standby control circuit 27 generates a turn-on pulse signal to the base of the transistor 275, and the transistor 275 is turned on. The output terminal 251 of the tank circuit 25 is loaded with a voltage at the primary end of the optocoupler 276, so that the primary end and the secondary end of the optocoupler 276 18 200917638 are sequentially turned on, and the output of the inverter 277 is pulled low. . The output of the inverter 277 outputs a high voltage signal through the first output terminal 271 of the standby control circuit 27 to cause the switch control circuit 264 of the main circuit 26 to start operating, thereby making the first circuit of the main circuit 26 The two outputs 260, 261 output a voltage, and the microprocessor 28 controls the operation of the load. The microprocessor 28 simultaneously transmits control signals via its first and second output terminals 281, 282 to lock the operational states of the flip-flop 274 and the transistor 275 of the standby control circuit 27. Compared with the prior art, when the power supply circuit 20 of the present invention enters the shutdown or standby state, the main circuit 26 stops operating, and therefore, the power supply circuit 20 consumes less power than the power supply circuit of the prior art. The power supply circuit 20 can also detect the working state of the load by the standby control circuit 27. If the load stops working, the power circuit 20 automatically enters a standby state, thereby stopping the main circuit 26, and the power circuit 20 Energy consumption is even lower. The power supply circuit 20 of the present invention supplies power to the energy storage circuit 25 via the energy harvesting circuit 22 as compared with the prior art. When the power circuit 20 enters a shutdown or standby state, the first, second, and third micro-energy acquiring circuits 223, 224, and 225 supply power to the energy storage circuit 25, and when the power circuit 20 operates normally, the large The energy harvesting circuit 222 also supplies power to the tank circuit 25, thereby speeding up the charging circuit 25. At the same time, the user can more clearly judge the working state of the power circuit 20 via the blinking of the LED 244 of the standby indicating circuit 24. Referring to Fig. 7, a block diagram of a circuit structure of a second embodiment of the power supply circuit of the present invention is shown. The difference between the power supply circuit 30 and the power supply circuit 20 is that the first input end 311 of the power supply circuit 30 is electrically connected to the rectifying and filtering circuit %, and the second input end 312 is electrically connected to the rectifying and filtering circuit by a relay 313. 33. When the power supply circuit 30 enters the shutdown or standby state, the standby clamp circuit 37 sends a control signal to turn off the relay 313, so that the main circuit 36 of the power supply circuit 30 stops working to achieve the purpose of reducing power consumption. In summary, the present invention has indeed met the requirements of the invention and has been applied in accordance with the law. However, the above is only the scope of the preferred embodiments of the present invention and is not limited to the above-described embodiments, and equivalent modifications or variations made by the present invention in accordance with the spirit of the present invention are within the scope of the patent application. . The following is a brief description of the circuit structure of the prior art power supply circuit. 2 is a schematic diagram of an internal circuit of the main circuit shown in FIG. 2, and FIG. Figure 4 is a diagram of the heart energy acquisition circuit and the memory diagram of Figure 2. <円 Circuit Schematic Figure 5 is the standby indicating circuit shown in Figure 2. Figure 6 is not intended for the same Μ _ & η 1 1 I path.不 is the standby control circuit of Figure 2. The vertical circuit structure block diagram Fig. 7 is the power supply circuit of the present invention. r , ^ wood - shell, know the way 畲 L main component symbol description] electric power circuit 20, 30 skirt 211, 311 22, 32 large energy acquisition circuit 222 second wheel end 212, 319 input terminal 221 2 Energy Acquisition Electron-Micro Energy Acquisition Circuit 20 223 200917638 . Second Micro Energy Acquisition Circuit. Third Micro Energy Acquisition Battery 225 Output Terminal 231 Capacitor 241 Second Transistor 243 Voltage Regulator 245 Output Terminal 251 First Output Terminal 260 Third output 262 switch control circuit 264 feedback circuit 266 secondary coil 268 first output 271 switch 273 transistor 275 inverter 277 first output 281 third output 283 input 291 second output 293 224 rectification Filter circuit 23 standby finger circuit 24 first transistor 242 light emitting diode 244 energy storage circuit 25 main circuit 26, 36 second output terminal 261 transformer 263 transistor 265 primary coil 267 standby control circuit 27, 37 second output 272 Reactor 274 Optocoupler 276 Microprocessor 28 Second Output 282 Standby Detection Circuit 29 First Output 292 Relay 313 21