Ϊ343515Ϊ343515
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因素校正電路及其使用之輸出 控制電路與方法，且特別是有關於一種利用耦合感應電壓來做 輸出控制的功率因素校正電路及其使用之輸出控制電路與方 法0 【先前技術】 功率因素校正（power factor correction，PFC)電路是目IX. Description of the Invention: [Technical Field] The present invention relates to a power factor correction circuit and an output control circuit and method therefor, and more particularly to a power factor correction using a coupled induced voltage for output control Circuit and its output control circuit and method 0 [Prior Art] Power factor correction (PFC) circuit is the target
前廣泛運用於電子裝置中的一種電源轉換電路，其可以改善交 流電源以使電壓與電流能盡量成為同相位的狀態。此外， 操作特性的緣故，PFC電路從電源抽取電力的速度較為和緩'， 因此可以降低抽取電力時所造成的電流峰值，進而減少電源的 、但是，在電子裝置的電源輸入端新增PFC電路誠然可以 減少電源的瞬間負載’卻同時也@為必須增加相對應的控制電 ^來控制PFC電路的運作而提高電力的耗損量。所以，對二 月源逐漸缺乏而重視節能的現代社會來說，pFC電路的加入將 與能源利用的發展方向背道而驰。為了解決這個問題，一般的 電路設計都是在電子裝置待機的時㈣閉pFC的功能 使待機狀態時的PFC電路的輸出為開迴路。 δ月參恥圖其為習知技術中常用的PFC電路的電路方塊 ，?圖所不1知技術在PFC電路10的低電輸出端1Η ，南電壓輸出端112)設置—個關13()，並 1 回20广确助電壓請、系統端控制源… 迴路128等雜成的控㈣絲使得待機 〜時 知作迴路觸的輸出為開迴路（負載接於高電 6 1343515A power conversion circuit widely used in electronic devices, which can improve the AC power supply so that the voltage and current can be in the same phase as possible. In addition, due to the operating characteristics, the PFC circuit draws power from the power supply at a relatively slow speed, so that the peak current caused by the extraction of power can be reduced, thereby reducing the power supply. However, adding a PFC circuit at the power input end of the electronic device is true. It is possible to reduce the instantaneous load of the power supply, but at the same time, it is necessary to increase the corresponding control circuit to control the operation of the PFC circuit to increase the power consumption. Therefore, for the modern society that is gradually lacking in February and paying attention to energy conservation, the addition of pFC circuits will run counter to the development direction of energy utilization. In order to solve this problem, the general circuit design is when the electronic device is in standby (4) The function of the pFC is turned off. The output of the PFC circuit in the standby state is an open circuit. The δ month shame map is a circuit block of a PFC circuit commonly used in the prior art, and the technology is not set at the low power output end of the PFC circuit 10, and the south voltage output terminal 112) is set to a 13 () And 1 back to 20 wide to help the voltage please, the system side control source... The circuit 128 and other miscellaneous control (four) wire makes the standby ~ when the loop is the output of the circuit is open circuit (load connected to high power 6 1343515
壓輸出私112與低電壓輸出端114之間），藉此以減少pFC 電路10的電力消耗量。 此種PFC電路及其使用之控制電路的設計方式已經被廣 泛使用，如美國第6229724號專利與美國第6157177號專利， ，者美國第20070115695號專利申請案與美國第2〇〇6〇267513 號專利申請案等，雜用了類似的輸出控制電路。然而，該等 電路仍有以下的缺陷存在：The voltage is output between the private 112 and the low voltage output 114), thereby reducing the amount of power consumed by the pFC circuit 10. Such PFC circuits and the design of control circuits therefor have been widely used, such as U.S. Patent No. 6,229,724 and U.S. Patent No. 6,157,177, U.S. Patent No. 20070115695, and U.S. Patent No. 2,267,. Patent applications, etc., use a similar output control circuit. However, these circuits still have the following drawbacks:
，1.控制電路所產生的控制訊號必須同時提供給pFC操作 迴路100 (藉以控制PFC積體電路）卩及開關13〇，藉此來控 制PFC電路1〇的輸出。 2. 前述的第一開關迴路126與第二開關迴路128等傳統 開關驅動電路啸複雜，需要财的電子零件以及製造成本。 3. !知技财常❹N㉟金氧半導體場效電晶體 (NMOSFET)為開關13〇。但因為線路特性的要求，此種開 電壓輸出端Μ (如圖1所示）。而若要將此 種汗U於rsjf壓輸出端112，麟路的複雜度合更為提升。 有很= = :FC電路及其使用的輸出控制電路還 【發明内容】 耗費績供—種功率因純4路，射減少雜時所需 電路本種功率因素校正電路所使用之輸出控制 電路，、了k供相對習知技術來說更為簡單 率因素校正電路的輪出。 Μ路’以控制功 t發明另外提供—種功率因素校正電路 制方法，其根據功率因素校正電路的作動而改變此功率= 1M3515 正電路的輸出。 本發明的其他目的和優點可以從本發明所揭露的 徵中得到進-步的了解。 7将 —為達上述之一或部份或全部目的或是其他目的，本發明一 二施例提出一種功率因素校正電路，於此功率因素校正 電源輸入端耦接第一電感的第—端，並使第一電感的第二 —單向導通元件的正端。第—單向導通元件的負: 缝儲存元件的第—端電性她至高電壓輸出端，而第 儲存元件的第二劇電性输至低電壓輸出端。此功率 I素板正電路的特徵在於包括電壓輕合it件、第二能量儲存元 及第二單向電流導通元件，其中，合元件 感^弟-電感之電壓變化而產生―個控制訊號；第二能量 二^接至電壓輕合猶以根據控制訊號的狀態而儲存 ，里，開關元件的輸人端電性祕於第—能量儲存元件斑古 端或低電壓輸出端之間’其控制端接收前述的控制= 否ΙΓί量=電元量’以藉此決定開關元件是 電^導件電_接於關元件的輪出端 ^電流從電壓耦合元件向開關元件的輸出端流動。 ^發明Ρ個實施例提供了—種功翔素校正電路所使 j輸出控制電路，其用以控制功率时校正電路之輸出。此 因，校正電路包括電㈣合元件、能量儲存元件、開關元 單向電流導通it件。其中，電_合藉根據功率因素 ^正電路的電壓變化而產生對應的控制訊號；能量储存元件接 =此控制職’並根據㈣m號的㈣補存或釋放能量 關7C件電性_於功率因素校正電路之輸出端組巾的一個接 腳上’再者’開關元件由前述的控制訊號及能量儲料件所釋 8 1343515 放的能量來蚊是科通；單向電流導通元件電絲接於電壓 搞合7"件與前述的接腳之間，藉此以禁止電流從電魏合元件 流向此接腳。 本發明另一個實施例提供了 一種功率因素校正電路所使 用之輸ώ控㈣H其中’功率时校正電路根據_個切換訊 號而運作。此輸$控制方法首先藉她合錢因為此切換訊號 而在功率電路巾造成的電壓變化來產生控制訊號，之 後再根據控制訊號*決定要儲存或釋放能量，最制結合前述 的控制til號及能量來控制功率因素校正電路對外輸出的電路 是否導通。 因為直接根據功率因素校正電路的電壓變化來控制功率 因素杈正電路本身的輸出，因此在電路設計上十分簡單。此 外’根據此種電路設計方式’即使開關元件設置在高電壓輸出 端，也不會使得電路設計變得更為複雜。 為讓本發明之上述和其他目的、特徵和優點能更明顯易 懂，下文特舉較佳實施例’並配合所附圖式，作詳細說明如下。 【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 配合參考圖式之一較佳實施例的詳細說明中，將可清楚的呈 現。以下實施例中所提到的方向用語’例如：上、下、左、右、 前或後等，僅是參考附加圖式的方向。因此，使用的方向用語是 用來說明並非用來限制本發明。請參照圖2,其為根據本發明一 實施例之功率因素校正（p0wer factor correcti〇n，ρρς;)電路 之電路方塊圖。在本實施例中，PFC電路2〇包括了電壓耦合 元件200與212、單向導通元件2〇2與216、能量儲存元件204 與 214、開關元件 206 與 218、PFC 積體電路（Integrated Circuit， 9 1343515 .IC ) 208、待機電源230、系、統端控制源、232、待機電源輔助電 壓234及開關迴路240。其中，電壓輕合元件雇的一端電性 耦接至輸入電源VlN，另一端則電性辆接至單向導通元件202 的正端以及開關元件206的一個輸入/輸出端。單向導通元件 202的負端電性麵接至能量儲存元件2〇4的一端，而能量儲存 兀件204的另一端與開關元件2〇6的另一個輸入/輸出端接地。 如本技術領域者所知，電壓耦合元件2〇〇、單向導通元件 2犯、能量儲存元件204及開關元件2〇6組成一個基本的升壓 變換器（b〇ostconverter)。此升壓變換器是構成pFc電路2〇 •工作能力的基礎電路。當PFC IC 2〇8從開關迴路謂獲得電 力供應的時候，PFC IC 會產生一個切換訊號25〇。藉由輸 出切換訊號250，PFC IC 208就可以控制開關元件2〇6的開啟 /關閉。隨著切換訊號250改變開關元件施關啟/關閉狀態， 流經電壓輕合元件的電流會產生變化，義使得電壓麵合 元件200的跨壓也跟著改變。這個電壓變化會受到單向導通元 件202的控制，並同時配合能量儲存元件2〇4的能量儲存/釋 放功能而在由接腳222 (或稱高電壓輸出端）及接腳224 (或 • 稱低電，輸出端）所組成的輸出端組上產生一個輸出電壓。一 本實施例中的一個重點在於PFC電路2〇之中包括了一個 輸出控制電路210。此輸出控制電路210包括了前述的電壓耦 合元件212、能量儲存元件214、單向導通元件216以及開關 元件218。其中，電壓耦合元件212的一端電性耦接至單向導 通元件216的負端，電壓耦合元件212的另一端與能量儲存元 件214的一端相電性耦接’並一起電性耦接至開關元件218的 控制端。開關元件218的一個輸入/輸出端電性耦接於單向導 通兀件202的負端，另一個輸入/輸出端則電性耦接至能量儲 1343515 • 存元件214的另一端及單向導通元件21ό的正端。 如圖所示，電壓耦合元件200設置於電壓耦合元件200 的附近，藉此以耦合感應電壓耦合元件200上的跨壓變化而產 生一個相對應的控制訊號。當此控制訊號的電壓值大於能量儲 存元件214兩端跨壓的時候，能量就會被儲存到能量儲存元件 214之中；相對的，當此控制訊號的電壓值小於能量儲存元件 214兩端跨壓的時候，能量儲存元件214就會反過來輸出能 量。控制訊號及能量儲存元件214所釋放的能量提供至開關元 Β 件218的控制端以控制開關元件218的開啟/關閉。 更詳細地說，一般在待機的時候’由待機電源230、系統 端控制源232、待機電源輔助電壓源234以及開關迴路240所 形成的控制電路並不會啟動PFC 1C 208。是以，電壓耦合元件 200不會因為電流改變而產生電壓變化，而電壓耦合元件212 也就不會產生耦合電壓。在這種狀況下，開關元件218將不會 被驅動而導通，所以PFC電路20不會在接腳222與224提供 輸出電壓給負載220使用。據此，可以利用切斷PFC電路20 的輸出通路而使得在待機狀態下的PFC電路20不會產生損 • 耗。 在非待機的狀況下，PFC 1C 208就會被啟動。假設PFC 1C 2〇8所輸出的切換訊號250導致開關元件206關閉，則電路特 性將使得電壓耦合元件200的打點端成為負電位。此時，電壓 輕合元件212會耦合感應出一個切換電壓，且其打點端也會是 負電位，所以單向導通元件216會導通。在這種狀況下，能量 儲存元件214將會被此切換電壓進行充電，且開關元件218將 會被驅動導通。 類似的，假設PFC 1C 208所輸出的切換訊號250導致開 1343515 端成！ 2〇6 _閉’則電路特性將使得電壓輕合元件200的打點 .換t正電位。此時’電壓编合元件212會耗合感應出一個切 因】t ’且其打點端也會是正電位，所以單向導通元件216會 存在处=止電流經由其而流向接腳222。在這種狀況下，儲 關元存疋件214中的能量會被釋放出來以驅動導通開 值得/主忍的是，由於開關迴路24〇只需要控制pFcIC2〇8 =需要額外控制如圖i所示的第二關迴路128，因此可 • _ =開關迴路240的線路複雜度。此夕卜，圖中所示的開關 18除了可以设置在接腳222上，也可以設置在接腳224 再者，除了使用由待機電源23〇、系統端控制源232、待 機電源輔助電壓源234及開關迴路240所組成的繁雜控制電 路之外’也可以使用如圖3所示的控制電路來控制pFCIC2〇8 的啟閉。請參照圖3，其為根據本發明一實施例之pF(：電路 中用以控制PFC 1C啟閉之電路的電路方塊圖。在此電路中， 辅助電壓源300可以提供電力、给PFC IC 32〇以驅動開關元件 (相當於圖2中的開關元件206)，此外並僅使用一個訊 * 號340來控制開關元件310以決定輔助電壓源300是否能被 提供到PFC 1C 320。至於訊號340的提供則為此技術領域者 所熟知，在此不予贅述。 另外值得注意的是’雖然在本實施例中是以電感代表電壓 耦合元件、以電容代表能量儲存元件、以二極體代表單向導通 元件，以及以N型金氧半導體（NM0S，N_type MetaR)xide1. The control signal generated by the control circuit must be supplied to the pFC operation circuit 100 (by controlling the PFC integrated circuit) and the switch 13A, thereby controlling the output of the PFC circuit 1〇. 2. The conventional switch drive circuit such as the first switch circuit 126 and the second switch circuit 128 is complicated, and requires electronic components and manufacturing costs. 3. Knowing the technology, the N35 MOSFET has a switch of 13 〇. However, due to the characteristics of the line, this open voltage output terminal Μ (shown in Figure 1). However, if this kind of sweat U is applied to the rsjf pressure output terminal 112, the complexity of the lining road is further improved. There is a very = = : FC circuit and its output control circuit also [invention content] Cost of performance - the power is pure 4 channels, the radiation required to reduce the time required for the circuit, the output control circuit used by this power factor correction circuit, k is a simpler factor correction circuit for the rotation of the conventional technique. The power circuit is additionally provided with a power factor correction circuit method which changes the output of the power = 1M3515 positive circuit according to the operation of the power factor correction circuit. Other objects and advantages of the invention will be apparent from the teachings of the invention. 7 - for one or a part or all of the above purposes or other purposes, the present invention provides a power factor correction circuit, wherein the power factor correction power input is coupled to the first end of the first inductor, And making the second end of the first inductor a positive terminal of the single-pass element. The first-to-one conduction element is negative: the first end of the slot storage element is electrically connected to the high voltage output, and the second power of the first storage element is output to the low voltage output. The positive circuit of the power board includes a voltage-lighting component, a second energy storage element, and a second unidirectional current conducting component, wherein the component senses a voltage change of the inductor to generate a control signal; The second energy is connected to the voltage and is stored according to the state of the control signal. In the middle, the input end of the switching element is electrically secreted between the first end of the energy storage element or the low voltage output end. The terminal receives the aforementioned control = no ΙΓ 量 amount = cell amount 'to thereby determine that the switching element is an electric component. The current is connected to the output terminal of the closing element. The current flows from the voltage coupling element to the output end of the switching element. An embodiment of the invention provides a j output control circuit for controlling the output of the power correction circuit. For this reason, the correction circuit includes an electric (four) component, an energy storage component, and a switching element unidirectional current conduction component. Wherein, the electric _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The output of the factor correction circuit is replaced by a control signal and an energy storage member. The energy discharged by the 13 1343515 is the Ketong; the unidirectional current conduction component is connected to the wire. The voltage is applied between the 7" member and the aforementioned pin, thereby prohibiting current from flowing from the electrical component to the pin. Another embodiment of the present invention provides a power-supply correction circuit for use in a power-supply control circuit in which the power-time correction circuit operates in accordance with _ switching signals. The $$ control method first uses her to convert the signal to generate a control signal due to the voltage change caused by the power circuit towel, and then decides to store or release the energy according to the control signal*, the most suitable combination of the aforementioned control til number and The energy is used to control whether the circuit of the power factor correction circuit is externally turned on. Since the output of the power factor correction circuit itself is directly controlled according to the voltage variation of the power factor correction circuit, the circuit design is very simple. In addition, according to this circuit design method, even if the switching element is disposed at the high voltage output terminal, the circuit design is not complicated. The above and other objects, features and advantages of the present invention will become more <RTIgt; The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention. The directional term 'as used in the following embodiments' is, for example, up, down, left, right, front or back, etc., only referring to the direction of the additional drawing. Therefore, the directional terminology used is for the purpose of illustration and not limitation. Please refer to FIG. 2, which is a circuit block diagram of a power factor correction (pρwer factor correcti〇n, ρρς;) circuit according to an embodiment of the invention. In the present embodiment, the PFC circuit 2A includes voltage coupling elements 200 and 212, unidirectional conduction elements 2〇2 and 216, energy storage elements 204 and 214, switching elements 206 and 218, and a PFC integrated circuit (Integrated Circuit, 9 1343515 .IC ) 208, standby power supply 230, system, system control source, 232, standby power supply auxiliary voltage 234, and switching circuit 240. The one end of the voltage-lighting component is electrically coupled to the input power source V1N, and the other end is electrically connected to the positive terminal of the unidirectional conduction component 202 and an input/output terminal of the switching component 206. The negative terminal of the one-way conducting element 202 is electrically connected to one end of the energy storage element 2〇4, and the other end of the energy storage element 204 is grounded to the other input/output of the switching element 2〇6. As is known to those skilled in the art, the voltage coupling element 2, the unidirectional element 2, the energy storage element 204 and the switching element 2〇6 form a basic boost converter. This boost converter is the basic circuit that constitutes the working capability of the pFc circuit. When the PFC IC 2〇8 receives power from the switching circuit, the PFC IC generates a switching signal 25〇. By outputting the switching signal 250, the PFC IC 208 can control the on/off of the switching elements 2〇6. As the switching signal 250 changes the switching element on/off state, the current flowing through the voltage-synchronizing element changes, and the voltage across the voltage-facing element 200 also changes. This voltage change is controlled by the unidirectional conduction element 202 and simultaneously with the energy storage/release function of the energy storage element 2〇4 by the pin 222 (or high voltage output) and the pin 224 (or • An output voltage is generated on the output group consisting of low power and output. An important point in an embodiment is that an output control circuit 210 is included in the PFC circuit 2A. The output control circuit 210 includes the aforementioned voltage coupling element 212, energy storage element 214, unidirectional conduction element 216, and switching element 218. The one end of the voltage coupling element 212 is electrically coupled to the negative end of the unidirectional element 216, and the other end of the voltage coupling element 212 is electrically coupled to one end of the energy storage element 214 and electrically coupled to the switch. The control end of element 218. One input/output terminal of the switching element 218 is electrically coupled to the negative terminal of the one-way pass element 202, and the other input/output terminal is electrically coupled to the energy storage 1343515. The other end of the memory element 214 and the one-way conduction The positive end of element 21ό. As shown, voltage coupling element 200 is disposed adjacent voltage coupling element 200, thereby generating a corresponding control signal by coupling a change in voltage across the inductive voltage coupling element 200. When the voltage value of the control signal is greater than the voltage across the energy storage element 214, the energy is stored in the energy storage element 214; in contrast, when the voltage value of the control signal is less than the cross-section of the energy storage element 214 When pressed, the energy storage element 214 in turn outputs energy. The energy released by the control signal and energy storage element 214 is provided to the control terminal of the switching element 218 to control the opening/closing of the switching element 218. In more detail, the control circuit formed by the standby power source 230, the system side control source 232, the standby power source auxiliary voltage source 234, and the switch circuit 240 generally does not activate the PFC 1C 208 during standby. Therefore, the voltage coupling element 200 does not cause a voltage change due to a change in current, and the voltage coupling element 212 does not generate a coupling voltage. In this case, the switching element 218 will not be driven to conduct, so the PFC circuit 20 will not provide an output voltage to the load 220 at pins 222 and 224. According to this, it is possible to cut off the output path of the PFC circuit 20 so that the PFC circuit 20 in the standby state does not cause a loss. In the non-standby state, PFC 1C 208 will be activated. Assuming that the switching signal 250 output by the PFC 1C 2〇8 causes the switching element 206 to be turned off, the circuit characteristics will cause the dot terminal of the voltage coupling element 200 to become a negative potential. At this time, the voltage-synchronizing element 212 is coupled to induce a switching voltage, and its striking end is also a negative potential, so the unidirectional conduction element 216 is turned on. In this case, the energy storage element 214 will be charged by this switching voltage and the switching element 218 will be driven to conduct. Similarly, assume that the switching signal 250 output by the PFC 1C 208 causes the 1343515 terminal to be turned on! 2〇6 _close' then the circuit characteristics will cause the voltage to lightly match the component 200. Change t to positive potential. At this time, the voltage-combining element 212 will consume a factor [t] and the hit-side will also be a positive potential, so that the one-way conduction element 216 will be present = the current will flow to the pin 222. Under this condition, the energy in the storage element 214 will be released to drive the conduction on/off. The switch circuit 24〇 only needs to control pFcIC2〇8 = additional control is required as shown in Figure i. The second closed circuit 128, therefore, can _ = the circuit complexity of the switching circuit 240. In addition, the switch 18 shown in the figure can be disposed on the pin 222, or can be disposed on the pin 224, in addition to using the standby power source 23, the system end control source 232, and the standby power supply auxiliary voltage source 234. And the complicated control circuit composed of the switch circuit 240 can also use the control circuit shown in FIG. 3 to control the opening and closing of the pFCIC2〇8. Please refer to FIG. 3, which is a circuit block diagram of a circuit for controlling PFC 1C switching in a circuit according to an embodiment of the present invention. In this circuit, the auxiliary voltage source 300 can supply power to the PFC IC 32. 〇 to drive the switching element (corresponding to the switching element 206 in FIG. 2), and in addition to using only one signal 340 to control the switching element 310 to determine whether the auxiliary voltage source 300 can be supplied to the PFC 1C 320. As for the signal 340 The provision is well known to those skilled in the art and will not be described here. It is also worth noting that although in the present embodiment, the inductor represents the voltage coupling element, the capacitor represents the energy storage element, and the diode represents the one-way. Conduction element, and N-type metal oxide semiconductor (NM0S, N_type MetaR) xide
Semiconductor )代表開關元件，但這並非表示只能使用這些電 子零件來做成這些元件。如此技術領域者所知，其他具有相同 或類似功能的電子零件，也可以在不修改電路或略微修改電路 12 1343515 的前提下適用於本發明所提供的概念下。 接下來請參照圖4,其為根據本發明一實施例之PFc電路 所使用之輸出控制方法的流程圖。為了讓此技術領域者能輕易 瞭解說明内容，在此將合併圖2的内容來說明這個流程圖。在 圖4所不的實施例中，首先是藉由耦合感應在pFc電路2〇之 中因為切換訊號所造成的電壓變化（步驟S400)而產生相對 個控制訊號（步驟S410)。當判斷控制訊號電位大於 忐=儲存元件214的電位的時候（步驟s42〇)，由控制訊號 所帶來的能量就會被儲存進能量儲存元件214之中（步驟 〇)，相對的，當判斷控制訊號電位不大於能量儲存元件 214的電位的時候（步驟S42G)，原本在能量儲存元件214 之，的能量就會被釋放出來（步驟S44〇)。在這之後，控制 =與則述能量的結合結果就可以被用來驅動開關元件2 ^ 8， 猎此以控制輸出電路是否能導通（步驟S45〇)。 述:藉由上述之電路與控制方法，除了電路架構更 電路射以在不需要外加控制訊號的情況下使得PFC ^路的輸出能在其運作時自動導通，並在其不運作時自動斷 本發日發明已雜佳實_揭露如上，然其並非用以限定 了作二許之更動與潤飾，因此本 附之申請專利範圍所界定 =月之保化圍當視後 申請專利_不須達縣發 卜^_任—實施例或 並非用來限助專敎件搜尋之用， 1343515 • 【圖式簡單說明] 圖1為習知技術中-種PFC電路的電路方塊圖。 圖2為根據本發明一實施例之PFC電路之電路方塊圖。 圖3為根據本發明一實施例之PFC電路中用以控制pFC 1C啟閉之電路的電路方塊圖。 圖4為根據本發明—實施例之PFC電路所使用之輸出控 制方法的流程圖。 【主要元件符號說明】 10、20 : PFC 電路 • 100 : PFC操作迴路 112 :高電壓輸出端 114 :低電壓輸出端 120、230 :待機電源 122、234 .待機電源輔助電壓源 124、232 :系統端控制源 126 :第一開關迴路 128 ·第二開關迴路 • 130:開關 200、212 :電壓耦合元件 202、216 .早向導通元件 204、214 :能量儲存元件 206、218、310、330 : 元件Semiconductor ) stands for switching elements, but this does not mean that these components can only be made using these electronic parts. As is known to those skilled in the art, other electronic components having the same or similar functions can be applied to the concepts provided by the present invention without modifying the circuit or slightly modifying the circuit 12 1343515. Next, please refer to FIG. 4, which is a flow chart of an output control method used by the PFc circuit according to an embodiment of the present invention. In order to make the description of the description easy for those skilled in the art, the contents of FIG. 2 will be combined to illustrate this flowchart. In the embodiment shown in Fig. 4, first, a relative control signal is generated by coupling sensing in the pFc circuit 2 due to a voltage change caused by switching signals (step S400) (step S410). When it is judged that the control signal potential is greater than the potential of the 忐=storage element 214 (step s42 〇), the energy brought by the control signal is stored in the energy storage element 214 (step 〇), in contrast, when judging When the control signal potential is not greater than the potential of the energy storage element 214 (step S42G), the energy originally stored in the energy storage element 214 is released (step S44A). After that, the result of the combination of control = and the energy described can be used to drive the switching element 2^8 to control whether the output circuit can be turned on (step S45). Said: With the above circuit and control method, in addition to the circuit structure and the circuit, the output of the PFC circuit can be automatically turned on when it is not required to operate, and automatically disconnected when it is not operating. The invention has been mixed up as well as the above. However, it is not intended to limit the modification and refinement of the two. Therefore, the scope of the patent application attached to this application is defined as the patent application for the month of Baohuawei. The county is not limited to assist in the search of the special parts, 1343515 • [Simplified illustration] FIG. 1 is a circuit block diagram of a PFC circuit in the prior art. 2 is a circuit block diagram of a PFC circuit in accordance with an embodiment of the present invention. 3 is a circuit block diagram of a circuit for controlling pFC 1C switching in a PFC circuit in accordance with an embodiment of the present invention. 4 is a flow chart of an output control method used by a PFC circuit in accordance with an embodiment of the present invention. [Main component symbol description] 10, 20: PFC circuit • 100: PFC operation circuit 112: High voltage output terminal 114: Low voltage output terminal 120, 230: Standby power supply 122, 234. Standby power supply auxiliary voltage source 124, 232: System End control source 126: first switching circuit 128 • second switching circuit • 130: switch 200, 212: voltage coupling elements 202, 216. early conduction elements 204, 214: energy storage elements 206, 218, 310, 330: components
208、320 : PFC 1C 210 :輸出控制電路 220 :負載 222、224 :接腳 1343515208, 320: PFC 1C 210: output control circuit 220: load 222, 224: pin 1343515
240 :開關迴路 250 :切換訊號 300 :輔助電壓源 S400〜S450 :本發明一實施例之施行步驟 15240: switching circuit 250: switching signal 300: auxiliary voltage source S400~S450: implementation step 15 of an embodiment of the present invention