M394507 五'新型說明： 【新型所屬之技術領域】 本創作關於一種電源控制開關，尤指一種將開關裝置設置在開關 電源供應（SMPS)控制電路二次側的電源控制開關。 【先前技術】 開關電源供應（Switch-Mode Power Supply，簡稱SMPS)技術， 使得電子產品的待機消耗功率可大為下降，目前已廣泛的被應用於充 電器、液晶顯示器 '電源適配器、系統電源供應、交流電源轉換器等 領域中。 在第一圖中顯示了習知開關電源供應（SMPS)控制電路圖，主要 係在連接100〜240V交流電的輸入電源端上設置了一實體開關9 ◦ 〇，以控制電源開啟關閉。交流電輸入後經整流器g 〇丄及濾波電容 9 0 2產生一輸入電壓vin以提供給一變壓器g 〇 4—次侧線圈，並 在連接至開關電源供應（SMPS)控制器g 〇 3以控制主開關g 〇 5。 當電流源Icc超過開關電源供應控制器9 3的啟動電流時，開 關電源供應控制器9 〇 3輸出開關脈衝給主開關9 〇 5，使變壓器9 0 4-次側線圈動作，使二次側線圈產生感應電壓，經—整流器9 〇 6及-;紐電谷9 〇 7產生輸出賴Vout。輸出電壓v〇ut回授至開關 電源供應控制gs 9 〇 3，而Μ電源供應控制器9 〇 3根據回饋信號 調節主開關9 0 5的占空比⑽模式）或開關鮮⑽模式），使 得輸出電壓Vout為一個穩定電壓值。 3 M394507 此種-般的SMPS控制電路中，控制電源開關的實體剩9 〇 〇 是被設置在-捕，具有大微及大魏消耗，當實體開關9 〇 ◦開 啟時’會有極大的瞬間電流，這將使得實體開關9 〇 〇在選用上，必 需要符合安全規範，*可能要作拉線及絕料保護，將使成本提高， 有待改善。 【新型内容】 緣此，本創作提供一種二次側電源控制開關，主要在一開關電源 供應（Switch-Mode Power Supply，SMPS)控制電路之主開關上，用一 第一金屬氧化半導體場效電晶體（MOSFET )來控制該主開關的開關動 作，並以一第一光耦合器隔離此開關裝置，而可使此開關裝置被設置 在二次侧；同時，提供一辅助電源以啟動該第一光耦合器。該開關裝 置可以是一個實體開關，也可以是低耗電之微控制器（MCU)或控制 線路所控制的電子式開關。藉此，當該開關裝置在關閉電源時，整體 消耗電能可達到毫瓦級，而可採用低價位低電流且免除安規需求之開 關。 進者’本創作所提供的二次側電源控制開關，其中開關裝置可以 是一個實體開關，也可以是低耗電之微控制器（MCU)或控制線路所 控制的電子式開關。 當本創作的開關裝置為實體開關時，為了防止無輸入電源而開關 裝置仍閉合(close)而消耗輔助電源之狀況，在該開關裝置進—步用— 第二金屬氧化半導體場效電晶體，並以一第二光耦合器隔離。當無輪 入電源而開關裝置仍閉合(close)時，第二光搞合器不作動，使第二金 4 M394507 屬氧化半導體場效電晶體關斷’以防止輔助電源對開關裝置放電。 以下，將依據圖面所示之實施例而詳加說明本創作之結構特點及 使用功效。 【實施方式】 請參見弟一圖所示’本創作提供了一種二次側電源控制開關，主 要係在一開關電源供應（SMPS)控制電路1 〇中，設置一第—金屬氧 化半導體場效電晶體2 0、一開關裝置3 〇、一第一光耗合器4 〇1 及4 0 2及一輔助電源5 0。 開關電源供應控制電路10具有一輸入電源端1 1以連接一交流 電源，例如AC 100〜240V ’經整流器1 2及第一濾波電容1 3產生一 輸入電壓Vin及啟動電流源Icc。變壓器1 4具有一次側線圈1 4 1及 二次側線圈14 2。一次側線圈141連接輸入電壓，二次側線圈1 4 2感應電壓經一整流及回授迴路15及第二渡波電容16產生一輪 出電壓Vout。主開關1 7連接於該變壓器1 4的一次側線圈1 4 1， 以控制一次側線圈1 4 1之導通與切斷。開關電源供應（SMPS)控制 器18控制主開關17，依據整流及回授迴路15之回授信號控制主 開關17之開關。 而本創作所提供的二次側電源控制開關，主要將第一金屬氧化半 導體場效電晶體（M0SFET) 2 0連接於主開關1 7上，並控制主開關 17的開關動作。而開關裝置3 0設置於變壓器14之二次侧。第一 光輕合器401及402，係由第一發光源及受光器構成，用以隔離 5 /關於—次側。辅助電源5 Q用以啟動第-光搞合器4 Ο 1及4 Ο 、彳如為個電池，以提供一電池電壓Vcell，該電池電壓vceii大 ;a7V；<m±第—光輕合器40 1及40 2之順向電壓Vd。 〇本創作在開關裝置3 〇斷開（〇pen)時，第一光耗合器4 〇丄及斗 2不動作，使第—金騎化半導體場效電晶體2 Q導通，並將主開 7關閉卩降低消耗電源之功率至毫瓦級。例如：電流源以=加 ’輸入電壓 Vin=U0 X 1.414 = 154V，則消耗功率=〇.〇3 X 154 二4·6™，故可稱為毫瓦級。 本創作在開關裝置3 〇閉合（eiGSe)時，由輔助電源5 〇提供電 、,°第光輕a器401及4〇 2將第-金屬氧化半導體場效電晶體 2 〇關閉’主_1 7動作而產生輸電壓VGUt，若輸出電壓V()ut大於 助電源之輕Veell ’則輸丨電壓Vcmt取代獅電源電壓繼續關閉第 金屬氧化半導體場效電晶體2 〇，使主開關i 7依據回授信號控制 開與關。 由於本創作的開關裝置3 〇可為一個實體開關，被設置在開關電 源供應控制電路1 〇二次側以控制電源關啟及關閉。當開關裝置3 〇在關閉電源時’整體雜電能可達職瓦級，而且開置3 〇可 採用低價位、低電流且免除安規需求之開關，而可大幅降低成本。 參見第三騎示本創作另―種實施例，開關裝置3 〇為實體開關 時，為了防iL輸人電源端1 1無交流電源且開關裝置3 〇仍閉合 (close)而消耗輔助電源5 〇之狀況，在開關裝置3 〇進一步連接一第 二金屬氧化料體場效電晶體3 1，並以由第二發光體及第二受光器 構成的一第二光稱合器3 21及3 2 2隔離。 M394507 當輸入電源端1 1未接輸入電源而開關裝置3 〇仍閉合(咖e) 時’第二光輕合器3 2 1及3 2 2不作動，使第二金屬氧化半導體場 效電晶體3 1 _，以等效於開關裝置3 Q斷開(Qpen)，防止輔助電: 5 0消耗。 另，請參見第四圖所示本創作再_實施例，其中開騎置6 〇也 可是-個以-低耗電之微控㈣（MCU)或—控制線路6丄所控制的 電子式開關。 综上所陳，本創作所提供的一種二次侧電源控制開關，確實可達 到關閉時低消耗功率之功效，完全符合專利要件，爰依法提出申請。 【圖式簡單說明】 第一圖代表習知SMPS的基本電路圖， 第二圖代表本創作之電路圖， 第三圖代表本創作另一種實施例之電路圖， 第四圖代表本創作再一種實施例之電路圖。 【主要元件符號說明】 開關電源供應控制電路1 〇 輸入電源端11 整流器1 2 第一濾波電容13 變壓器1 4： 一次侧線圈141 7 M394507 二次側線圈14 2 整流及回授迴路15 第二濾波電容16 主開關1 7 開關電源供應控制器18 第一金屬氧化半導體場效電晶體2 0 開關裝置3 0 第二金屬氧化半導體場效電晶體31 第二光耦合器3 21及3 2 2 第一光耦合器401及402 輔助電源5 0 開關裝置6 0 低耗電之微控制器（MCU)或控制線路6 1 實體開關9 0 0 整流器9 01、9 0 6 濾波電容9 0 2、9 0 7 開關電源供應控制器9 0 3 變壓器9 0 4 主開關9 0 5M394507 Five new description: [New technology field] This work is about a power control switch, especially a power control switch that sets the switching device on the secondary side of the switching power supply (SMPS) control circuit. [Prior Art] Switch-Mode Power Supply (SMPS) technology makes the standby power consumption of electronic products greatly reduced. It has been widely used in chargers, liquid crystal displays, power adapters, and system power supplies. In the field of AC power converters. In the first figure, a conventional switching power supply (SMPS) control circuit diagram is shown, which mainly sets a physical switch 9 ◦ 在 on the input power terminal connected to 100~240V alternating current to control the power on and off. After the AC input, an input voltage vin is generated via the rectifier g 〇丄 and the filter capacitor 902 to be supplied to a transformer g 〇 4 - the secondary side coil, and is connected to a switching power supply (SMPS) controller g 〇 3 to control the main Switch g 〇5. When the current source Icc exceeds the starting current of the switching power supply controller 93, the switching power supply controller 9 〇3 outputs a switching pulse to the main switch 9 〇 5, so that the transformer 9 0 4-second side coil operates to make the secondary side The coil generates an induced voltage, which is output via the rectifiers 9 〇 6 and -; New Grid 9 〇 7 to produce the output Vout. The output voltage v〇ut is fed back to the switching power supply control gs 9 〇3, and the Μ power supply controller 9 〇3 adjusts the duty cycle (10) mode of the main switch 905 or the switch fresh (10) mode according to the feedback signal, so that The output voltage Vout is a stable voltage value. 3 M394507 In this kind of SMPS control circuit, the remaining 9 控制 of the control power switch is set to - catch, with large and large Wei consumption, when the physical switch 9 〇◦ is turned on, there will be a great moment. The current, which will make the physical switch 9 选用 in the selection, must comply with the safety regulations, * may need to be pulled and cut-off protection, will increase the cost, need to be improved. [New content] Therefore, this creation provides a secondary side power control switch, mainly on a main switch of a Switch-Mode Power Supply (SMPS) control circuit, using a first metal oxide semiconductor field effect power a crystal (MOSFET) controls the switching action of the main switch, and isolates the switching device by a first optical coupler, so that the switching device is disposed on the secondary side; meanwhile, an auxiliary power source is provided to activate the first Optical coupler. The switch device can be a physical switch or a low power microcontroller (MCU) or an electronic switch controlled by a control line. Thereby, when the switching device is turned off, the overall power consumption can reach milliwatt level, and the switch with low price and low current can be used and the safety requirement can be eliminated. The secondary side power control switch provided by the author's creation, wherein the switching device can be a physical switch or a low power consumption microcontroller (MCU) or an electronic switch controlled by a control circuit. When the switching device of the present invention is a physical switch, in order to prevent the input device from being closed and the auxiliary power supply is consumed in order to prevent no input power, the switching device further uses - the second metal oxide semiconductor field effect transistor, And isolated by a second optocoupler. When the power is turned on and the switching device is still closed, the second light combiner does not actuate, causing the second gold 4 M394507 to be an oxidized semiconductor field effect transistor to turn off to prevent the auxiliary power source from discharging the switching device. Hereinafter, the structural features and functions of the present invention will be described in detail based on the embodiments shown in the drawings. [Embodiment] Please refer to the figure shown in the figure. 'This creation provides a secondary side power control switch, mainly in a switching power supply (SMPS) control circuit 1 ,, setting a first metal oxide semiconductor field effect The crystal 20, a switching device 3, a first optical coupler 4 〇1 and 4 0 2 and an auxiliary power supply 50. The switching power supply control circuit 10 has an input power terminal 1 1 for connecting an AC power source, for example, AC 100 to 240 V' to generate an input voltage Vin and a starting current source Icc via the rectifier 12 and the first filter capacitor 13. The transformer 14 has a primary side coil 1 4 1 and a secondary side coil 14 2 . The primary side coil 141 is connected to the input voltage, and the secondary side coil 142 is induced to generate an output voltage Vout via a rectification and feedback circuit 15 and a second wave capacitance 16. The main switch 17 is connected to the primary side coil 1 4 1 of the transformer 14 to control the conduction and disconnection of the primary side coil 1 4 1 . The switching power supply (SMPS) controller 18 controls the main switch 17, and controls the switching of the main switch 17 in accordance with the feedback signal of the rectification and feedback circuit 15. The secondary side power control switch provided by the present invention mainly connects the first metal oxide semiconductor field effect transistor (M0SFET) 20 to the main switch 17 and controls the switching operation of the main switch 17. The switching device 30 is disposed on the secondary side of the transformer 14. The first light combiners 401 and 402 are composed of a first light source and a light receiver for isolating the 5/about-secondary side. The auxiliary power source 5 Q is used to activate the first light combiner 4 Ο 1 and 4 Ο , for example, a battery to provide a battery voltage Vcell, the battery voltage vceii is large; a7V; <m± first light contract The forward voltage Vd of the devices 40 1 and 40 2 . When the switching device 3 is turned off, the first light consuming device 4 〇丄 and the hopper 2 do not operate, so that the first gold riding semiconductor field effect transistor 2 Q is turned on, and the main opening is 7 Close 卩 Reduce the power consumption of the power supply to the milliwatt level. For example, the current source is = plus ' input voltage Vin = U0 X 1.414 = 154V, then the power consumption = 〇. 〇 3 X 154 2 4 6TM, so it can be called milliwatt level. In the present invention, when the switching device 3 is closed (eiGSe), the auxiliary power source 5 〇 supplies electricity, and the first light-emitting light a 401 and 4 〇 2 turn off the first metal oxide semiconductor field effect transistor 2 ' 'main_1 7 action produces the output voltage VGUt, if the output voltage V()ut is greater than the light power of the power supply Veell' then the output voltage Vcmt replaces the lion supply voltage and continues to turn off the metal oxide semiconductor field effect transistor 2 〇, so that the main switch i 7 is based The feedback signal is controlled on and off. Since the switching device 3 of the present invention can be a physical switch, it is disposed on the secondary side of the switching power supply control circuit 1 to control the power on and off. When the switching device 3 is turned off, the overall power can reach the service level, and the switch can be used for low-cost, low-current, and safety-free switches, which can greatly reduce the cost. Referring to the third embodiment of the present invention, when the switch device 3 is a physical switch, the auxiliary power source 5 is consumed in order to prevent the iL input power terminal 1 from having no AC power and the switch device 3 is still closed. In the case of the switch device 3, a second metal oxide body field effect transistor 31 is further connected, and a second light bonder 3 21 and 3 2 is formed by the second light body and the second light receiver. 2 isolation. M394507 When the input power terminal 1 1 is not connected to the input power supply and the switching device 3 is still closed (coffee e), the second light-spinners 3 2 1 and 3 2 2 are not activated, so that the second metal oxide semiconductor field effect transistor 3 1 _, to be equivalent to the switching device 3 Q disconnect (Qpen), to prevent auxiliary power: 50 consumption. In addition, please refer to the fourth embodiment of the present invention, in which the opening and setting of 6 〇 can also be - a low-power micro-control (four) (MCU) or - control line 6 丄 controlled electronic switch . In summary, the secondary side power control switch provided by this creation can achieve the effect of low power consumption when shutting down, fully comply with the patent requirements, and apply in accordance with the law. BRIEF DESCRIPTION OF THE DRAWINGS The first diagram represents the basic circuit diagram of the conventional SMPS, the second diagram represents the circuit diagram of the present creation, the third diagram represents the circuit diagram of another embodiment of the present creation, and the fourth diagram represents a further embodiment of the present creation. Circuit diagram. [Main component symbol description] Switching power supply control circuit 1 〇 Input power terminal 11 Rectifier 1 2 First filter capacitor 13 Transformer 1 4: Primary side coil 141 7 M394507 Secondary side coil 14 2 Rectification and feedback loop 15 Second filter Capacitor 16 Main switch 1 7 Switching power supply controller 18 First metal oxide semiconductor field effect transistor 2 0 Switching device 3 0 Second metal oxide semiconductor field effect transistor 31 Second photocoupler 3 21 and 3 2 2 First Optocoupler 401 and 402 Auxiliary power supply 5 0 Switching device 6 0 Low power consumption microcontroller (MCU) or control line 6 1 Physical switch 9 0 0 Rectifier 9 01, 9 0 6 Filter capacitor 9 0 2, 9 0 7 Switching Power Supply Controller 9 0 3 Transformer 9 0 4 Main Switch 9 0 5