200926566 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種.電源切換電路。 【先前技術】 Ο 二相父流電源係由三個頻率相同、振幅相等、相位依次 互差120。之交流電勢組成之電源。三相交流電較單相交流 電有很多優點，它在發電、輸配電以及電能轉換為機械能方 面都^明顯之優越性。例如：製造三相發電機、變壓器都較 衣仏早相發電機、變壓器省材料，而且構造簡單、性能優良。 又如’用同樣材料所製造之三相電機，其容量比單相電機 輸送同樣功率之情況下，三相輸電線較單相輸電線， 二節省有色金屬，而且電能損耗較單相輸電時少。由於三相 又机電具有上述優點’所以獲得了廣泛應用。 習知之許多用電以部都設有交流/直流轉換電路，以 套從二相交流電源獲得之交流電壓轉換為直流電壓後供自 使用而虽二相父流電源之一相或兩相交流電源出現異常 法正響供電交流7直流轉換電路之輸出，使用電器無 【發明内容】 源之内各’有必要提供—種簡易的可對三相交流 路丨狀悲進行自動判斷和切換之三相交流電源切換 唯捭=父流電源之—相或兩相交流電源電塵出現異常 維持電壓輸出。 中 種二相父流電源切換電路 包括一三相交流電源、 200926566 ί *刀換開關及—第二切換開關’該三相交流電源之第-相 '交μ電源和第一相交流電源透過該第一切換開關選擇性輸 .^，第i刀換開關受該第—相交流電源之輸出電壓控制， 田呑，相父'巩電源正常工作時，該第一切換開關輸出該第 一相電源之輸出電壓，該第一切換開關之輸出電壓及該 一相又/瓜電源之第二相交流電源透過該第二切換開關選擇 性輸出’該第二切換開關受該第三相交流電源之輸出電遷控 制1該第三相交流電源正fjl作時，該第二城開關輪: 該弟二相父流電源之輸出電Μ。 該三相交流電源切換電路透過兩切換開關實現了三相 交流電源^三相輸出自動切換功能’在該三相交流電源之— 相或兩相交流電源出現異常時維持電壓輸出穩定。 【實施方式】 " 參照圖1，本發明三相交流電源切換電路之較佳實施方 式包括一二相交流電源、一第一切換開關1〇及一第二切換 〇開關，’該三相交流電源包括一第一相交流電源二第 二相交流電源Ρ2和-第三相交流電源ρ3，該三相交流電源 之第-相交流電源Ρ1、第二相交流電源？2和第三相交流電 源Ρ3均具有一火線l和一水線ν。 該第一切換開關10為一繼電器，其包括—第一通曾 12、一第二通道14及一控制線圈16，該第—通道12設有= 常開點1ΝΟ、一常閉點INC及一輸出端lc，該第二通道 設有一常開點2NO、一常閉點2NC及一輸出端2 交k電源之第一相交流電源Pi之火線L盥皮 〃水線N分別連接 8 200926566 至該第一切換開關10之第一通道12與第二通道14之常開 .點1NO和2NO，該三相交流電源之第二相交流電源P2之火 線L與水線N分別連接至該第一切換開關10之第一通道12 與第二通道14之常閉點INC、2NC，該第一切換開關10之 控制線圈16受該三相交流電源之第一相交流電源P1控制， 當該三相交流電源之第一相交流電源P1正常供電時，該第 一切換開關10之輸出端1C和2C分別與該三相交流電源之 第一相交流電源P1之火線L和水線N導通。 〇 該第二切換開關20為一繼電器，其包括一第一通道 22、一第二通道24及一控制線圈26，該第一通道22設有一 常開點3NO、一常閉點3NC及一輸出端3C，該第二通道24 設有一常開點4NO、一常閉點4NC及一輸出端4C。該三相 交流電源之第三相交流電源P3之火線L與水線N分別連接 至該第二切換開關20之第一通道22與第二通道24之常開 點3NO和4NO，該第一切換開關10之輸出端1C和2C分別 ❹連接至該第二切換開關20之第一通道22與第二通道24之 常閉點3NC、4NC，該第二切換開關20之控制線圈26受該 三相交流電源之第三相交流電源P3控制，當該三相交流電 源之第三相交流電源P3正常供電時，該第二切換開關20之 輸出端3C和4C分別與該三相交流電源之第三相交流電源 P3之火線L和水線N導通。 該三相交流電源切換電路之工作過程如下：當該三相交 流電源之第一相交流電源P1正常供電時，該第一切換開關 10之輸出端1C和2C分別與該三相交流電源之第一相交流 200926566 電源Ρ1之火線L和水線Ν導通，並連接到該第一 20’此時若該三相交流電源之第三相交流電源換開關 則該第二切換開關20之輸出端3C和4C分別與^一吊供電j 電源之第三相交流電源P3之火線l和水線N '相乂 /瓜 相交流電源之第三相交流電源P3出現異常，則誃_ 開關20之輸出端3C和4C分別與該三相 雪=第二切換 父流電源P1之火線L和水線N導通。參考表一，、乐相 Ο 交流電源中各相交流電源工作狀態與該第二 ^該二相 輸出對應關係。 、汗關20之 Ο 表一 第一相狀態 第二相狀態200926566 IX. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to a power switching circuit. [Prior Art] Ο The two-phase parent current power supply system has the same frequency, equal amplitude, and phase difference 120. The power source consisting of alternating current potential. Three-phase AC has many advantages over single-phase AC, and it has obvious advantages in power generation, transmission and distribution, and conversion of electrical energy into mechanical energy. For example, the manufacture of three-phase generators and transformers is better than the materials of the early stage generators and transformers, and the structure is simple and the performance is excellent. Another example is the three-phase motor made of the same material, the capacity of which is higher than that of the single-phase motor. The three-phase transmission line is more than the single-phase transmission line, the second is to save non-ferrous metals, and the power loss is less than that of single-phase transmission. . Since three-phase electromechanical has the above advantages, it has been widely used. Many of the conventional electric power units are provided with an AC/DC conversion circuit, and the AC voltage obtained from the two-phase AC power source is converted into a DC voltage for use, and although the two-phase parent current power source is one phase or two-phase AC power source. The abnormal method is sounding the output of the power supply AC 7 DC conversion circuit, and the use of the electric appliance is not available. [Inventive content] Each source within the source is required to provide a simple three-phase automatic judgment and switching of the three-phase AC path. AC power switching is only 捭 = parent flow power - phase or two-phase AC power supply dust abnormal maintenance voltage output. The middle-phase two-phase parent flow power switching circuit comprises a three-phase AC power supply, a 200926566 ί * knife change switch and a second switch switch, the first phase of the three-phase AC power source and the first phase AC power source pass through the The first switch is selectively outputted. ^, the i-th knife change switch is controlled by the output voltage of the first-phase AC power source, and the first switch is outputted by the first switch when the power supply of the first-phase power supply is normal. The output voltage, the output voltage of the first switch, and the second phase AC power of the phase/guap power supply are selectively output through the second switch. The second switch is output by the third phase AC power source. The electric power control 1 when the third phase AC power source is fjl, the second city switch wheel: the output power of the second phase of the parental power source. The three-phase AC power switching circuit realizes a three-phase AC power supply through the two switchers. The three-phase output automatic switching function maintains the voltage output stable when the phase or two-phase AC power supply of the three-phase AC power source is abnormal. [Embodiment] Referring to FIG. 1, a preferred embodiment of a three-phase AC power switching circuit of the present invention includes a two-phase AC power supply, a first switching switch 1〇, and a second switching switch, 'the three-phase alternating current The power supply includes a first phase AC power source 2, a second phase AC power source Ρ2, and a third phase AC power source ρ3, and the first phase AC power source Ρ1 and the second phase AC power source of the three-phase AC power source. Both the 2 and 3 phase AC power sources 具有3 have a live line 1 and a water line ν. The first switch 10 is a relay, which includes a first pass 12, a second channel 14 and a control coil 16. The first channel 12 is provided with a normally open point 1 ΝΟ, a normally closed point INC and a The output terminal lc, the second channel is provided with a normally open point 2NO, a normally closed point 2NC and an output terminal 2, and the first phase AC power source Pi of the first phase AC power supply is connected to the fire line L, the skin water line N is respectively connected to 8 200926566 to The first channel 12 of the first changeover switch 10 and the second channel 14 are normally open. Points 1NO and 2NO, the live line L and the water line N of the second phase AC power source P2 of the three-phase AC power source are respectively connected to the first switch The first channel 12 of the switch 10 and the normally closed points INC, 2NC of the second channel 14, the control coil 16 of the first switch 10 is controlled by the first phase AC power P1 of the three-phase AC power source, when the three-phase AC When the first phase AC power source P1 of the power source is normally powered, the output terminals 1C and 2C of the first switching switch 10 are respectively turned on with the live line L and the water line N of the first phase AC power source P1 of the three-phase AC power source. The second switch 20 is a relay, and includes a first channel 22, a second channel 24 and a control coil 26. The first channel 22 is provided with a normally open point 3NO, a normally closed point 3NC and an output. At the end 3C, the second passage 24 is provided with a normally open point 4NO, a normally closed point 4NC and an output end 4C. The live line L and the water line N of the third-phase AC power source P3 of the three-phase AC power source are respectively connected to the normally open points 3NO and 4NO of the first channel 22 and the second channel 24 of the second switch 20, the first switching The output terminals 1C and 2C of the switch 10 are respectively connected to the normally closed points 3NC, 4NC of the first channel 22 and the second channel 24 of the second switch 20, and the control coil 26 of the second switch 20 is subjected to the three phases. The third phase AC power source P3 of the AC power source controls, when the third phase AC power source P3 of the three-phase AC power source is normally powered, the output terminals 3C and 4C of the second switch 20 are respectively the third of the three-phase AC power source The live line L and the water line N of the alternating current power source P3 are turned on. The working process of the three-phase AC power switching circuit is as follows: when the first phase AC power P1 of the three-phase AC power supply is normally powered, the output terminals 1C and 2C of the first switching switch 10 and the three-phase AC power supply respectively One phase AC 200926566 power line 1 is connected to the live line L and the water line ,, and is connected to the first 20'. At this time, if the third phase AC power of the three-phase AC power is changed, the output of the second switch 20 is 3C. And the 4C and the 4C respectively supply the power supply j power of the third phase AC power P3 fire line l and the water line N 'phase / melon phase AC power of the third phase AC power source P3 is abnormal, then 誃 _ switch 20 output 3C and 4C are respectively turned on with the live line L and the water line N of the three-phase snow=second switching parent current power source P1. Referring to Table 1, the phase relationship between the AC power supply status of each phase in the AC power supply and the second ^ the two phase output. Khan off 20 Ο Table 1 First phase state Second phase state
^ — - " —---- ----- — .,.1*1,才目 該三相交流電源切換電路透過切換 流電源之輸出自動切換，在該三相交流電源之 出現異常時在第二切換開關20之輪出端3。和‘ 維持穩定之交流電壓輸出’藉此，為用電器内部之交; 200926566 直流轉換電路提供穩定之交流電源輸入，保證用電器穩定工 作。 綜上所述，本發明符合發明專利要件，爰依法提出專利 申請。惟，以上所述者僅為本發明之較佳實施例，舉凡熟悉 本案技藝之人士，在爰依本發明精神所作之等效修飾或變 化，皆應涵蓋於以下之申請專利範圍内。 【圖式簡單說明】 圖1係本發明三相交流電源切換電路較佳實施方式之 電路圖。 【主要元件符號說明】 第一相交流電源 P1 第二相父流電源 P2 第三相交流電源 P3 第一切換開關 10 第二切換開關 20 火線 L 水線 N 第一通道 12 ' 22 第二通道 14、24 控制線圈 16 > 26 11^ — - " —---- ----- — .,.1*1, the three-phase AC power switching circuit is automatically switched by switching the output of the streaming power supply, and the abnormality occurs in the three-phase AC power supply. At the wheel end 3 of the second changeover switch 20. And ‘maintaining stable AC voltage output’, this is the internal communication of the appliance; 200926566 DC conversion circuit provides stable AC power input to ensure the stable operation of the appliance. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a circuit diagram showing a preferred embodiment of a three-phase AC power supply switching circuit of the present invention. [Main component symbol description] First phase AC power supply P1 Second phase parent flow power supply P2 Third phase AC power supply P3 First changeover switch 10 Second changeover switch 20 Fire line L Water line N First channel 12 ' 22 Second channel 14 , 24 control coil 16 > 26 11