201025821 六、發明說明： 【發明所屬之技術領域】 本發明係有關於一種放電加工機節能放電電源，尤指 一種可減少不必要的電源浪費者。 【先前技術】 放電加工係利用電極以放電高溫熔融原理來加工工 β 件，圖一所示為傳統限流電阻式的放電加工電源，其放電 迴路是由一交流220V電源、交流功率變壓器Τ2、橋式整 流器A、限流電阻R2、防止逆向電流二極體D12與電晶體 Q5所組成，動作原理為首先由交流功率變壓器T2將市電 交流220V降壓成為交流56〜70V，之後再由橋式整流器A 整流濾波成為直流80〜100V，再經由限流電阻R2限流，此 時當電晶體Q’5導通時兩極間產生南壓直流電’在兩極間隙 達到適當的距離時便會產生破壞絕緣的放電電流，直到電 Q 晶體Q5截止時電流才會變為零，經過電晶體Q5戴止時間 後再次的將電晶體Q5導通，如此循環控制電晶體Q5導通 與截止時間，便可得到一連串的放電電流。此種電源的缺 點在於，交流功率變壓器T2會隨著其功率越大，體積越 大；而損耗方面，在於限流電阻R2上損耗的功率為所流過 電流的平方與限流電阻R2的乘積，因其損耗功率極大，所 以選用限流電阻R2的瓦特數也相對提高，造成體積龐大與 散熱不易等問題。電源實際使用於放電加工上約僅30%， 其餘70%的能源耗損在限流電阻R2上，造成效率低落。 201025821 因此，如何研發出一種放電加工機節能放電電源，其 可提高電源使用效率，達到有效節約能源的目的，將是本 發明所欲積極探討之處。 【發明内容】 本發明提出一種放電加工機節能放電電源，其主要特 性為提高電源使用效率，進而有效節約能源。 本發明之一樣態為一種放電加工機節能放電電源，包 ❹ 含有：一交流電源，其輸出一交流電壓；一交流轉直流電 壓轉換裝置，其與該交流電源耦接並將該交流電壓轉為一 第一直流電壓；一直流轉直流電壓轉換裝置，其與該交流 轉直流電壓轉換裝置粞接並將該第一直流電壓轉為一第二 直流電壓，其中該第二直流電壓會隨負載增.大而下降；一 限流單元，其與該直流轉直流電壓轉換裝置耦接並限制其 輸出電流的大小；一限時單元，其與該限流單元耦接，以 限制該輸出電流的電流輸出時間，進而限制一電極對一工 ⑬ 件加工與休止的時間；以及一控制單元，其與該限時單元 耦接並提供一放電時序脈波，用以控制該限時單元之導通 與截止。 本發明之另一樣態為一種放電加工機節能放電電源， 包含有：一直流電源，其輸出一第一直流電壓；一直流轉 直流電壓轉換裝置，其與該直流電源耦接並將該第一直流 電壓轉為一第二直流電壓，其中該第二直流電壓會隨負載 增大而下降；一限流單元，其與該直流轉直流電壓轉換裝 置耦接並限制其輸出電流的大小；一限時單元，其與該限 201025821 流單元耦接，以限制該輸出電流的電流輸出時間，進而限 制一電極對一工件加工與休止的時間；以及一控制單元， • 其與該限時單元麵接並提供一放電時序脈波，用以控制該 . 限時單元之導通與戴止。 藉由將直流轉直流電壓轉換裝置設定在高電壓調整率 的狀態下，當放電加工機開始加工時會先產生一高壓直流 電引弧，當引弧成功後，直流轉直流電壓轉換裝置的輸出 電壓會下降，減少不必要的電源浪費，達到節能的目的。 Φ 其中限流單元使用電子開關，利用控制電子開關的特性， 來產生不同的電流大小，藉此方式達到限電流之目的。 【實施方式】 岑充分暸解本發明之特徵及功效，茲藉由下述具體之 實施例，並配合所附之圖式，對本發明做一詳細說明，說 明如後： 圖二為本發明之一具體實施例的系統示意圖，請參考 Q 圖二，本發明之一種放電加工機節能放電電源，包含有： 一交流電源1，其輸出一交流電壓；一交流轉直流電壓轉 換裝置2，其與該交流電源1耦接並將該交流電壓轉為一 第一直流電壓；一直流轉直流電壓轉換裝置3，其中該直 流轉直流電壓轉換裝置3係由一主放電電路與一引弧電路 所構成，其與該交流轉直流電壓轉換裝置2耦接並將該第 一直流電壓轉為一第二直流電壓，其中該第二直流電壓會 隨負載增大而下降，一般來說，較佳係其下降的電壓不低 於25伏特，通常該直流轉直流電壓轉換裝置3係為一線性 201025821 電源轉換器或一切換式電源轉換器（例如，降壓型電源轉換 器（Buck converter)、昇壓型電源轉換器（Boost converter)、昇降壓型電源轉換器（Buck-boost converter)、邱克電源轉換器（C’ uk converter)、返驰 式電源轉換器（F1 yback converter)、順向式電源轉換器 (Forward converter)、半橋式電源轉換器（Half-bridge converter)、全橋式電源轉換器（Full bridge converter) 或推挽式電源轉換器（Push-pull converter)); —限流單 元4，其與該直流轉直流電壓轉換裝置3耦接並限制其輸 出電流的大小，其令該限流單元4較佳係利用控制至少一 電子開關，以產生不同的輸出電流大小，且較佳係該限流 單元4係由金氧半場效電晶體（M0SFET)或雙極性接面電 晶體（BJT)構成；一限時單元5，其與該限流單元4輕接， 以限制該輸出電流的電流輸出時間，·進而限制一電極7對 一工件8加工與休止的時間；以及一控制單元6，其與該 限時單元5耦接並提供一放電時序脈波，用以控制該限時 單元5之導通與戴止’而本發明所述之放電加工機節能放 電電源，其可由多個益聯來供應負载電流。 圖三為本發明之另一具體實施例的系統示意圖，請參 考圖三，本發明之一種放電加工機節能放電電源，包含有： 一直流電源9，其輸出一第一直流電壓；一直流轉直流電 壓轉換裝置10，其中該直流轉直流電壓轉換裝置1〇係由 一主放電電路與一引弧電路所構成’其與該直流電源9耗 接並將該第一直流電壓轉為一第二直流電壓，其中該第二 直流電壓會隨負載增大而下降，一般來說，較佳係其下降 201025821 的電壓不低於25伏特，通常該直流轉直流電壓轉換裝置 10係為一線性電源轉換器或一切換式電源轉換器（例如， 降壓型電源轉換器（Buck converter)、昇壓型電源轉換器 - (Boost converter)、昇降壓型電源轉換器（Buck-boost converter)、邱克電源轉換器（C’ uk converter)、返驰 式電源轉換器（Flyback converter)、順向式電源轉換器 (Forward converter)、半橋式電源轉換器（Half-bridge converter)、全橋式電源轉換器（Full bridge converter) ❹ 或推挽式電源轉換器（Push-pul 1 converter)); —限流單 元11 ’其與該直流轉直流電壓轉換裝置1〇耦接並限制其 輸出電流的大小’其中該限流單元11較佳係利用控制至少 一電子開關’以產生不同的輸出電流大小，且較佳係該限 流單元11係由金氧半場效電晶體（M0SFET)或雙極性接面 電晶體（BJT)構成；一限時單元12，其與該限流單元丨丨耦 接，以限制該輸出電流的電流輸出時間，進而限制—電極 13對一工件14加工與休止的時間；以及一控制單元15， ⑩其與該限時單元12耦接並提供一放電時序脈波，用以控制 该限時單元12之導通與截止，而本發明所述之放電加工機 節能放電電源，其可由多個並聯來供應負載電流。 圖四為本發明之一具體實施例的電路示意圖以及圖五 為根據圖四電路之相關波形時序圖，其中圖五（a)為使用等 頻率的方法，圖五（b)為使用等能量的方法，請同時參考圖 四及圖五’本具體實施例依其系統功能可分為三大部份： 電源轉換單元、限流及限時單元與控制單元，分述如下： 1.電源轉換器單元16:電源轉換器單元16中之直流轉直 201025821 流電壓轉換裝置3係由主放電電路17與引弧電路18所 構成。主放電電路17，用以提供放電加工機主要加工 時的電源；引弧電路18，裝設於直流轉直流電壓轉換 裝置3中的高頻變壓器T1二次繞組上，用以產生引弧 放電的高壓直流電。主放電電路17動作如下，首先將 交流電源1經過二極體D1〜D4所組成的橋式整流器全波 整流（即，交流轉直流電壓轉換裝置2)，再經過電容器 C1濾波，產生一高壓直流電壓V2，再經由控制與驅動 裝置U1供給電壓至電能切換開關Ql、Q2，此時電能切 換開關以、Q2隨著控制與驅動裝置U1所送出的訊號頻 率做高頻切換動作，並將整流濾波後的直流電壓切割成 高頻方波訊號，再經過高頻變壓器T1隔離與降壓之後 將能量傳送至高頻變壓器T1二次側的整流濾波電路做 整流與低通濾波的動作，成為一穩定直流電壓V3，其 輸出電壓具有隨負載增大而下降之特性。引弧電路18 動作如下，首先全波整流電路將高頻交流電做全波整 流，再經過濾波電路做低通濾波，使其產生一穩定的高 壓直流電壓V4，當高壓直流電將絕緣介質打穿之後， 會開始產生放電，此時引弧電路18的高壓直流電壓V4 會因電阻R1限制其輸出電流，導致輸出功率不足而電 壓開始下降。整個電源轉換器單元16動作如下，當放 電加工機開始加工時，引弧電路18會先產生一高壓直 流電V4，當高壓直流電V4將絕緣介質打穿之後，會開 始產生放電，此時引弧電路18輸出的高壓直流電V4會 因輸出功率不足而電壓開始下降，當其下降至小於主放 201025821 電電路17的輸出電壓V3準位以後，二極體Dll會導 通，此時，主放電電路17作為一電流源使用，提供放 電加工機主要加工時的能量，並將能量傳輸至限流及限 時裝置單元。 2. 限流及限時單元19 :限流及限時單元19由限流單元4 與限時單元5所構成。限流單元4用以限制放電加工機 加工時的電流大小；限時單元5用以限制放電加工機的 加工與休止時間。整個限流及限時裝置單元19動作如 下，首先由穩壓裝置U2提供一穩定的特殊驅動電壓並 供給至限電流開關Q3,藉由此電壓的大小限制限電流 開關Q3導通程度，導通程度愈大，放電加工機輸出電 流也愈大；相反的，導通程度愈小，放電加工機輸出電 流也愈小。接著，再藉由驅動裝置U3做隔離驅動的方 式供給電能切換開關Q4所需的驅動電壓，經由電能切^ 換開關Q4導通與否來限制放電加工機的加工時間，由 此動作做為放電加工機加工時的ON time與OFF time 功能。 3. 控制單元6 :控制單元6由控制器裝置U4與放電波形 控制裝置U5所構成。放電波形控制裝置U5用以提供等 能量或等頻率的放電時序脈波至各放電電源迴路來控 制切換開關導通與戴流（ON-OFF)時間。整個控制單元6 動作如下，首先由使用者在控制裝置U4設定加工參 數，經由一匯流排傳遞給放電波形控制裝置U5，放電 波形控制裝置U5產生放電時序脈波，脈波經驅動裝置 U3，控制切換開關Q4，與放電回路連接來切換產生放 201025821 電脈波。 由以上所述可以清楚地明瞭，本發明係提供一種放電 • 加工機節能放電電源，其可提高電源使用效率，達到有效 - 節約能源的目的。 以上已將本發明專利申請案做一詳細說明，惟以上所 述者，僅為本發明專利申請案之較佳實施例而已，當不能 限定本發明專利申請案實施之範圍。即凡依本發明專利申 請案申請範圍所作之均等變化與修飾等，皆應仍屬本發明 Φ 專利申請案之專利涵蓋範圍内。 201025821 【圖式簡單說明】 圖一為傳統限流電阻式的放電加工電源。 圖二為本發明之一具體實施例的系統示意圖。 圖三為本發明之另一具體實施例的系統示意圖。 圖四為本發明之一具體實施例的電路示意圖。 圖五（a)為根據圖四電路使用等頻率的方法之相關波形 時序圖。 圖五（b)為根據圖四電路使用等能量的方法之相關波形 φ 時序圖。 【主要元件符號說明】 1交流電源 2交流轉直流電壓轉換裝置 3直流轉直流電壓轉換裝置 4限流單元 5限時單元 6控制單元 7電極 8工件 9直流電源 10直流轉直流電壓轉換裝置 11限流單元 12限時單元 201025821 13電極 14工件 15控制單元 16電源轉換器單元 17主放電電路 18引弧·電路 19限流及限時裝置單元 T1高頻變壓器 ❿ T2交流功率變壓器 A橋式整流器 R1電阻 R2電阻 D1二極體 D2二極體 D3二極體 D4二極體 ❿ D5二極體 D6二極體 D7二極體 D8二極體 D9二極體 D10二極體 D11二極體 D12二極體 Q1電能切換開關 201025821 Q2電能切換開關 Q3限電流開關 Q4電能切換開關 Q5電晶體 C1電容器 C2電容器 C3電容器 C4電容器 C5電容器 C6電容器 U1控制與驅動裝置 U2穩壓裝置 U3驅動裝置 Μ控制器裝置 U5放電波形控制裝置 Νρ線圈匝數 Nsl線圈匝數 Ns2線圈匝數 Ns3線圈匝數201025821 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to an energy-saving discharge power source for an electric discharge machine, and more particularly to a power supply waste that can reduce unnecessary power. [Prior Art] The EDM process uses the electrode to process the β-parts by the principle of high-temperature melting. Figure 1 shows the traditional current-limiting resistor-type EDM power supply. The discharge circuit consists of an AC 220V power supply and an AC power transformer. The bridge rectifier A, the current limiting resistor R2, the reverse current diode D12 and the transistor Q5 are formed. The operation principle is that the AC power transformer 220 is firstly stepped down to AC 56~70V by the AC power transformer T2, and then bridged. Rectifier A rectifies and filters to DC 80~100V, and then limits current through current limiting resistor R2. At this time, when the transistor Q'5 is turned on, the south voltage direct current is generated between the two poles. When the two poles reach the proper distance, the insulation will be broken. The discharge current will not become zero until the electric Q crystal Q5 is turned off. After the transistor Q5 is worn for a while, the transistor Q5 is turned on again, so that the cycle control transistor Q5 is turned on and off, and a series of discharges can be obtained. Current. The disadvantage of this type of power supply is that the AC power transformer T2 will have a larger volume with its power. In terms of loss, the power loss on the current limiting resistor R2 is the product of the square of the current flowing and the current limiting resistor R2. Because of its large power loss, the wattage of the current limiting resistor R2 is also relatively increased, resulting in problems such as bulky size and heat dissipation. The power supply is actually used in electrical discharge machining for only about 30%, and the remaining 70% of the energy is consumed on the current limiting resistor R2, resulting in low efficiency. 201025821 Therefore, how to develop an energy-saving discharge power source for electric discharge machine, which can improve the efficiency of power supply and achieve effective energy conservation, will be actively explored by the present invention. SUMMARY OF THE INVENTION The present invention provides an energy-saving discharge power source for an electric discharge machine, the main characteristic of which is to improve power supply efficiency and thereby effectively save energy. The same state of the present invention is an energy-saving discharge power source for an electric discharge machine, comprising: an alternating current power source, which outputs an alternating current voltage; an alternating current to direct current voltage converting device coupled to the alternating current power source and converting the alternating current voltage into a first DC voltage; a DC voltage conversion device that is connected to the AC to DC voltage conversion device and converts the first DC voltage into a second DC voltage, wherein the second DC voltage increases with load. Large and decreasing; a current limiting unit coupled to the DC-to-DC voltage conversion device and limiting the magnitude of the output current; a time-limiting unit coupled to the current limiting unit to limit the current output time of the output current And limiting the time during which one electrode is processed and rested by 13 pieces; and a control unit coupled to the time-limiting unit and providing a discharge timing pulse wave for controlling the on and off of the time-limited unit. Another aspect of the present invention is an energy-saving discharge power source for an electric discharge machine, comprising: a DC power supply, which outputs a first DC voltage; a DC-DC conversion device that is coupled to the DC power supply and coupled to the first DC The voltage is converted to a second DC voltage, wherein the second DC voltage decreases as the load increases; a current limiting unit coupled to the DC-to-DC voltage conversion device and limits the magnitude of the output current; a time-limited unit And the current unit is coupled to the current limit of the current source to limit the current output time of the output current, thereby limiting the time during which one electrode processes and stops the workpiece; and a control unit that interfaces with the time-limited unit and provides a Discharge timing pulse wave to control the conduction and wear of the time-limited unit. By setting the DC-to-DC voltage conversion device to a state of high voltage regulation rate, when the EDM machine starts processing, a high-voltage DC electric arc is generated first. When the arc-trigger is successful, the output voltage of the DC-DC voltage conversion device is output. Will drop, reduce unnecessary power waste, and achieve energy saving. Φ The current limiting unit uses an electronic switch to control the characteristics of the electronic switch to generate different current levels, thereby achieving the purpose of limiting the current. DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail with reference to the following specific embodiments and the accompanying drawings. FIG. For a schematic diagram of a system of a specific embodiment, please refer to FIG. 2, an energy-saving discharge power supply for an electric discharge machine according to the present invention includes: an AC power supply 1, which outputs an AC voltage; an AC-to-DC voltage conversion device 2, The AC power source 1 is coupled and converts the AC voltage into a first DC voltage; the DC voltage conversion device 3 is continuously flowed, wherein the DC-DC voltage conversion device 3 is composed of a main discharge circuit and an arc-ignition circuit. Coupling with the AC-DC voltage conversion device 2 and converting the first DC voltage into a second DC voltage, wherein the second DC voltage decreases as the load increases. Generally, it is preferably decreased. The voltage is not lower than 25 volts. Usually, the DC-to-DC voltage conversion device 3 is a linear 201025821 power converter or a switched power converter (for example, step-down power) Converter (Buck converter), boost converter (Boost converter), buck-boost converter, C' uk converter, flyback power converter ( F1 yback converter), forward converter (Half-bridge converter), full bridge converter (Full bridge converter) or push-pull power converter (Push- Pull converter)); - a current limiting unit 4 coupled to the DC-to-DC voltage conversion device 3 and limiting the magnitude of its output current, which preferably causes the current limiting unit 4 to control at least one electronic switch to generate Different output current sizes, and preferably the current limiting unit 4 is composed of a metal oxide half field effect transistor (M0SFET) or a bipolar junction transistor (BJT); a time limiting unit 5, and the current limiting unit 4 Lightly connecting to limit the current output time of the output current, and further limiting the time during which one electrode 7 processes and rests a workpiece 8; and a control unit 6 coupled to the time-limiting unit 5 and providing a discharge timing pulse The wave is used to control the conduction and wear of the time-limited unit 5, and the EDM power-discharge power supply of the present invention can supply a load current by a plurality of benefits. 3 is a schematic diagram of a system according to another embodiment of the present invention. Referring to FIG. 3, an energy-saving discharge power source for an electric discharge machine according to the present invention includes: a DC power source 9 that outputs a first DC voltage; The voltage conversion device 10, wherein the DC-DC voltage conversion device 1 is composed of a main discharge circuit and an arc-trigger circuit, which is connected to the DC power source 9 and converts the first DC voltage into a second DC voltage. a voltage, wherein the second DC voltage decreases as the load increases. Generally, the voltage of the 201022021 is preferably not less than 25 volts. Generally, the DC-to-DC voltage conversion device 10 is a linear power converter. Or a switched power converter (for example, a buck converter, a boost converter, a boost-boost converter, a Qiuk power converter) C' uk converter, flyback converter, forward converter, half bridge power converter (Half-br Idge converter), full bridge converter (Push-pul 1 converter); - current limiting unit 11 'coupled to the DC to DC voltage conversion device 1 Connecting and limiting the magnitude of the output current thereof, wherein the current limiting unit 11 preferably uses at least one electronic switch to generate different output current magnitudes, and preferably the current limiting unit 11 is a metal oxide half field effect transistor. (M0SFET) or bipolar junction transistor (BJT); a time-limiting unit 12 coupled to the current limiting unit 以 to limit the current output time of the output current, thereby limiting the electrode 13 to a workpiece 14 Processing and rest time; and a control unit 15, 10 coupled to the time-limiting unit 12 and providing a discharge timing pulse for controlling the on and off of the time-limiting unit 12, and the electric discharge machine of the present invention An energy-saving discharge power source that can supply load current from a plurality of parallel connections. 4 is a circuit diagram of an embodiment of the present invention and FIG. 5 is a timing diagram of related waveforms according to the circuit of FIG. 4, wherein FIG. 5(a) is a method using equal frequency, and FIG. 5(b) is a method using equal energy. For the method, please refer to FIG. 4 and FIG. 5 simultaneously. 'This embodiment can be divided into three parts according to its system function: power conversion unit, current limiting and time-limited unit and control unit, which are described as follows: 1. Power converter unit 16: DC direct current in the power converter unit 16 201025821 The flow voltage converting device 3 is composed of a main discharge circuit 17 and an arc start circuit 18. The main discharge circuit 17 is configured to provide a power supply for the main processing of the electric discharge machine; the arc-trigger circuit 18 is mounted on the secondary winding of the high-frequency transformer T1 in the DC-to-DC voltage conversion device 3 for generating an arc discharge discharge. High voltage direct current. The main discharge circuit 17 operates as follows. First, the AC power source 1 is subjected to full-wave rectification (ie, AC-to-DC voltage conversion device 2) of a bridge rectifier composed of diodes D1 to D4, and then filtered by a capacitor C1 to generate a high-voltage DC. The voltage V2 is supplied to the power switching switches Q1 and Q2 via the control and driving device U1. At this time, the power switching switch performs the high frequency switching action with the signal frequency sent by the control and the driving device U1, and the rectifying filter is performed. After the DC voltage is cut into a high-frequency square wave signal, after the high-frequency transformer T1 is isolated and stepped down, the energy is transmitted to the rectifier filter circuit on the secondary side of the high-frequency transformer T1 for rectification and low-pass filtering, becoming a stable The DC voltage V3 has an output voltage that has a characteristic that decreases as the load increases. The arc-trigger circuit 18 operates as follows. First, the full-wave rectification circuit performs full-wave rectification of the high-frequency alternating current, and then performs low-pass filtering through the filter circuit to generate a stable high-voltage DC voltage V4. When the high-voltage direct current breaks through the insulating medium, The discharge will start to occur. At this time, the high-voltage DC voltage V4 of the arc-trigger circuit 18 will limit its output current due to the resistor R1, resulting in insufficient output power and a drop in voltage. The entire power converter unit 16 operates as follows. When the electric discharge machine starts processing, the arc-trigger circuit 18 first generates a high-voltage direct current V4. When the high-voltage direct current V4 breaks through the insulating medium, a discharge is started, and the arc-ignition circuit is started. 18 output high-voltage DC V4 will start to drop due to insufficient output power. When it drops to less than the output voltage V3 of the main circuit 201025821, the diode Dll will be turned on. At this time, the main discharge circuit 17 is used. A current source is used to provide energy for the main processing of the EDM machine and to transfer energy to the current limiting and time-limited device unit. 2. Current limiting and time limiting unit 19: The current limiting and time limiting unit 19 is composed of a current limiting unit 4 and a time limiting unit 5. The current limiting unit 4 is used to limit the current during processing of the electric discharge machine; the time limiting unit 5 is used to limit the processing and rest time of the electric discharge machine. The entire current limiting and time-limiting device unit 19 operates as follows. First, a stable special driving voltage is supplied from the voltage stabilizing device U2 and supplied to the current limiting switch Q3. By the magnitude of the voltage, the current limit of the current limiting switch Q3 is limited, and the conduction degree is increased. The output current of the electric discharge machine is also larger; on the contrary, the smaller the conduction degree, the smaller the output current of the electric discharge machine. Then, the driving voltage required for the power switching switch Q4 is supplied to the driving device U3 in an isolated driving manner, and the processing time of the electric discharge machine is limited by the switching of the electric energy switching switch Q4, thereby performing the electric discharge machining. ON time and OFF time functions during machining. 3. Control unit 6: The control unit 6 is composed of a controller device U4 and a discharge waveform control device U5. The discharge waveform control device U5 is configured to provide equal-energy or equal-frequency discharge timing pulse waves to the respective discharge power supply circuits to control the switching switch conduction and ON-OFF time. The whole control unit 6 operates as follows. First, the user sets the processing parameters in the control device U4, and transmits the processing parameters to the discharge waveform control device U5 via a bus bar. The discharge waveform control device U5 generates a discharge timing pulse wave, and the pulse wave is controlled by the driving device U3. The switch Q4 is switched to be connected to the discharge circuit to switch and generate the 201025821 electric pulse wave. It can be clearly seen from the above that the present invention provides a discharge/process machine energy-saving discharge power source, which can improve the power use efficiency and achieve an effective-saving energy. The above is a detailed description of the present patent application, but the above description is only a preferred embodiment of the present invention, and the scope of implementation of the patent application of the present invention is not limited. That is, the equivalent changes and modifications of the scope of application of the patent application of the present invention should remain within the scope of the patent application of the Φ patent application. 201025821 [Simple description of the diagram] Figure 1 shows the traditional current limiting resistor type EDM power supply. Figure 2 is a schematic diagram of a system in accordance with an embodiment of the present invention. Figure 3 is a schematic diagram of a system in accordance with another embodiment of the present invention. Figure 4 is a circuit diagram of one embodiment of the present invention. Figure 5(a) is a timing diagram of the relevant waveforms for the method using equal frequency according to the circuit of Figure 4. Figure 5(b) is a timing diagram of the associated waveform φ according to the method of using equal energy in the circuit of Figure 4. [Main component symbol description] 1 AC power supply 2 AC to DC voltage conversion device 3 DC to DC voltage conversion device 4 Current limiting unit 5 Time-limited unit 6 Control unit 7 Electrode 8 Workpiece 9 DC power supply 10 DC to DC voltage conversion device 11 Current limiting Unit 12 time-limited unit 201025821 13 electrode 14 workpiece 15 control unit 16 power converter unit 17 main discharge circuit 18 pilot arc circuit 19 current limit and time-limited device unit T1 high-frequency transformer ❿ T2 AC power transformer A bridge rectifier R1 resistor R2 resistance D1 diode D2 diode D3 diode D4 diode ❿ D5 diode D6 diode D7 diode D8 diode D9 diode D10 diode D11 diode D12 diode Q1 Power switch 201425821 Q2 power switch Q3 current limit switch Q4 power switch Q5 transistor C1 capacitor C2 capacitor C3 capacitor C4 capacitor C5 capacitor C6 capacitor U1 control and drive U2 voltage regulator U3 drive device Μ controller device U5 discharge waveform Control device Νρ coil turns Nsl coil turns Ns2 coil turns Ns3 coil turns