1389 5 2 a? ____B7_ 五、發明說明◦) 〔發明所屬之技術領域〕 本發明，係·關於裝載反換器電源之微波爐。 〔發明所要解決之課題〕 自已往，在微波爐，做爲磁控管驅動用反換器電源， 被使用稱爲"準正級^的一石式電壓諧振型反換器電源。 然而，雖然該一石式電壓諧振型反換器電源具有構成 簡單等優蘇，可是因在升壓變壓器會通過直流成份，爲了 提高升壓變壓器的飽和電壓，需使用大型者，難以將升壓 變壓器更小型化。 因此，被考慮採用能設法將升壓變壓器小型化的半電 橋型之反換器電源。亦即，半電橋型的反換器電源，係將 2個開關元件及2個諧振電容器半電橋連接而成，將不輸 出直流成份，做爲升壓變壓器能使用小形者之故。 可是.，採用半電橋型的反換器電源時，有時在磁控管 啓動時（陰極尙未被充份加熱之狀態），會由和在升壓變 壓器的二次繞組產生之浮遊（寄生）容量的自諧振，而發 生被稱爲振鈴之不需要諧振。如此地發生振鈴時1在升壓 變壓器的二級側將發生升壓率以上之高壓，故做爲升壓變 壓器需要使用絕緣耐壓大者。 一方面，設法以控制電路要抑制在升壓變壓器的二次 繞組發生之由振鈴的高電壓時，相對地磁控管啓動時之陰 極加熱用電流將減少，而產生磁控管啓動時間會變長之問 題。 本紙張尺度適用中固國家標準（CNS)A4規格（210 X 297公釐） (請先閲讀背面之注意事項再填寫本頁)1389 5 2 a? ____B7_ V. Description of the invention ◦) [Technical field to which the invention belongs] The present invention relates to a microwave oven equipped with an inverter power supply. [Problems to be Solved by the Invention] In the past, in a microwave oven, as a power source for a magnetron driving inverter, a stone-type voltage resonance type inverter power source called "quasi-positive level" has been used. However, although this stone-type voltage resonance inverter power supply has a simple structure, it is a high-quality, but because the booster transformer will pass the DC component, in order to increase the saturation voltage of the booster transformer, it is necessary to use a large one, and it is difficult to convert the booster transformer. Smaller. Therefore, a half-bridge inverter power supply capable of miniaturizing the step-up transformer has been considered. That is, the half-bridge type inverter power supply is formed by connecting two switching elements and two resonant capacitor half-bridges, and will not output a DC component, so that it can be used as a step-up transformer. However, when a half-bridge type inverter power supply is used, sometimes when the magnetron is started (cathode 尙 is not sufficiently heated), it will be caused by floating in the secondary winding of the step-up transformer ( Parasitic) capacity self-resonance, while unwanted resonance called ringing occurs. When ringing occurs in this way, 1 high voltage above the step-up rate will occur on the secondary side of the step-up transformer. Therefore, it is necessary to use a high insulation withstand voltage as the step-up transformer. On the one hand, trying to control the control circuit to suppress the high voltage caused by ringing in the secondary winding of the step-up transformer, the current for cathode heating when the magnetron starts will decrease, and the startup time of the magnetron will be longer. Problem. This paper size applies to China Solid National Standard (CNS) A4 (210 X 297 mm) (Please read the precautions on the back before filling this page)
裝-----^! —訂·--------線I 經濟部智慧財產局員工消費合作社印製 -4- r 4389 5 2 A7 ____B7_ 五、發明說明（2 ) •(請先閱讀背面之注意事項再填寫本頁) 本發明係鑑於上述情況而開發者，其目的，係在使用 半電橋型的反換器電源之構成，提供一面做爲升壓變壓器 使用絕緣耐壓小者，而能防止磁控管啓動時間變長之微波 爐。 〔爲了解決課題之方法〕 本發明，係在具備有將2個開關元件及2個諧振電容 器半電橋連接而成的開關部之反換器電源，和將該從反換 器電源的高頻電流以初級繞組接受而從二次繞組升壓而輸 出之升壓變壓器，和將該由升壓變壓器被升壓的高壓高頻 電流整流之高壓整流部，及以被施加該由高壓整流部被整 流的高壓直流電壓之狀態，把微波照射在調理室的磁控管 之微波壚，其特徵爲，前述升壓變壓器，係由一次繞組及 二次繞組被並聯地捲繞的捲線軸，和被***在該捲線軸之 心***孔，以其***狀態心隙位於二次繞組側的第1分割 心及第2分割心被構成（申請專利範圍第1項）。 經濟部智慧財產局員工消費合作社印製 由如此的構成時，從反換器電源輸出之高頻電流，將 以升壓變壓器的初級繞組被承接而升壓，從二次繞組做爲 高壓高頻電流輸出。此時，在升壓變壓器，因第1分割心 和第2分割心之心隙，係位於捲繞在捲線軸的二次繞組側 ，二次繞組側之自結合係數將減低，二次繞組側的自諧振 頻率已移至高頻側。結果，二次繞組側之電阻將變大，升 壓變壓器的二次繞組側之自諧振的Q値將變小，故能抑制 由自諧振之振鈴的發生。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -5- 4389 5 2 A7 經濟部智慧財產局員工消費合作社印製 B7 五、發明說明（3 ) 因此，做爲升壓變壓器將能使用絕緣耐壓小的小型者 ，並且因升壓率不會降低，故陰極加熱用電流不會降低， 磁控管之啓動時間也不會變長。 在上述構成，升壓變壓器之心隙，以對應位於二次繞 組的略中央爲理想（申請專利範圍第2項）。 根據如此之構成時，能使升壓變壓器的二次繞組側之 自諧振的Q値大幅降低，而有效率地防止發生振鈴。 並且「升壓變壓器的二次繞組側之由浮遊容量和電感 的諧振頻率，係以反換器電源之開關頻率的1 〇倍以上爲 理想（申請專利範圍第3項）。 根據如此的構成時，由升壓變壓器的二次繞組側之浮 遊容量和電感的自諧振頻率，因從反換器電源之開關頻率 大幅度地錯開，將由和心隙的二次繞組側之電阻的增大之 相乘效果，能夠大幅度地降低自諧振之Q値。 並且，高壓整流部，係由2個高壓電容器及2個高壓 二極管所成之兩波倍電壓整流電路爲理想（申請專利範圍 第4項）。 根據如此的構成時，升壓變壓器之二次側電路，將在 將正側和負側進行對稱動作，能夠和初級側電路的半電橋 型之反換器電源之對稱動作一起，將所有的動作做爲對稱 動作。由此，在半電橋型之反換器電源所使用的2個開關 元件和2個諧振電容器，及在高壓整流部所使用的2個高 壓電容器和高壓二極管，將能分別使用相同之元件1而能 容易地進行零件管理。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） — — — — — —-----裝- 111··— — 訂·！ 線 二請先閲讀背面之注意事項再填寫本頁) -ό - 4389 5 2 A7 _____B7_____ 五、發明說明（4 ) (諳先閱讀背面之注意事項再填寫本頁> 並且，升壓變壓器的二次繞組之端部中，位於一次繞 組側的端部，以被連接在構成兩波倍電壓整流電路之被串 聯連接的高壓電容器之共同連接點爲理想（申請專利範圍 第5項）。 根據如此的構成時，和一次繞組靜電結合之二次繞組 ，將成爲和微波爐的框高頻性地被連接，在二次繞組之自 諧振頻率的電壓諧振能將不易向一級側洩漏*而能防止升 壓變壓器乏變換效率降低。 而且，升壓變壓器之二次繞組，以將多數的單位繞線 部串聯連接而被形成爲理想（申請專利範圍第6項）。 根據如此的構成時，二次繞組全體之層間電壓將被減 低，靜電容量將等値性地降低，對高頻的電阻將變大，減 低二次繞組側的自諧振之Q値，能夠抑制發生振鈴。 並且，升壓變壓器的初級繞組，以由將0 . 1mm以 下之股線，絞合8條以上的專支線所形成爲理想（申請專 利範圍第7項）。 根據如此的構成時 > 將能一面提高在磁控管啓動時之 經濟部智慧財產局員工消費合作社印製 二次繞組電阻値，而把在反換器電源的動作頻率（例如 5 Ο Κ Η z )之二次繞組電阻値，抑制爲在低頻之1 . 2 倍程度。 亦即，因在升壓變壓器的二次繞組將通高頻電流，雖 然由表皮效果及接近效果之影響將成爲明顯，可是由使股 線徑變小且增加股線數，能夠避免由表皮效果和接近效果 之影響。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 4389 5 2 A7 __ _B7__' 五、發明說明（5 ) 乂請先閱讀背面之注意事項再填寫本頁) 此時，盡量縮小股線徑，雖然二次繞組在自諧振頻率 之電阻將變大而理想，可是在另一方面，因需要減小動作 頻率之電阻値，故股線的細線化必須在某範圍。 如此地，做爲能夠一面確保在動作頻率的電阻成份， 和二次繞組之自諧振頻率的電阻値比，使在動作頻率之損 失成爲充份小的構成，索支線很理想。 並且，在升壓變壓器之一次繞組間或一次繞組和半電 橋型的反換器電源的高壓電容器之間，把由電阻及電容器 所成的串聯電路連接爲理想（申請專利範圍第8項）。 根據如此之構成時，在升壓變壓器的一次繞組，能夠 抑制電壓波形的電壓變化率大之部份（d V / d t的絕對 値大之部份）的電壓變化率，故能抑制對加在一次繞組之 電壓波形對動作頻率的高頻成份。由此，二次繞組對自諧 振頻率之振動振幅將變小，而能抑制二次繞組電壓波形的 振鈴成份，將不會發生不需要之高電壓，而能從磁控管迅 速地啓動。 〔發明之實施例〕 經濟部智慧財產局員工消費合作社印製 以下，參照圖面說明本發明的一實施例。 第2圖係將微波爐斜視而顯示。在該第2圖，箱1係 成前面開口的箱狀，在箱1之內部設有調理室2 ’並且在 箱1的側方形成有機械室3。 _ 在機械室3之底部，配設有印刷電路板4 ’而在該印 刷電路板4裝載有升壓變壓器5。 本紙張尺度適用中國國家標準（CNS)A4規格（210x297公釐） -8- 經濟部智慧財產局員工消費合作社印製 4389 5 2 A7 B7 五、發明說明（6 ) 並且，在機械室3內，固定有面臨調理室2的導波管 6 ’成爲從磁控管7之微波將經由該導波管6照射在調理 室2。 第3圖係槪略顯示微波爐的槪略電性構成。該第3圖 中，在印刷電路板4，除了升壓變壓器5，並實裝有整流 部8，反換器控制部9，開關部1 0，高壓整流部1 1， 由反換器控制部9及開關部10構成反換器電源。 整流部_ 8，將商用交流電源由二極管電橋電路全波整 流後，由反應器及平流電容器（皆未圖示）平流，而將直 流電輸出至電源線1 2、1 3。 反換器控制部9，將所定頻率（例如50kHz)之 開關信號輸出至開關部1 0。 開關部1 0，在電源線1 2、1 3間，將2個開關元 件1 4串聯連接的串聯電路，和將2個諧振電容器1 5串 聯連接之串聯電路並聯連接，並且構成分別將開關元件 1 4的共同連接點和諧振電容器1 5之共同連接點做爲輸 出端子的半電橋型。此時，在開關元件1 4之集極和射極 間，連接有圖示極性的飛輪二極管1 6。並且，在開關元 件1 4之共同連接點和電源線1 3間，連接有由電容器 1 7和電阻1 8所成之串聯電路。 升壓變壓器5的一次繞組1 9，係分別和開關部1 0 之輸出端子連接。 高壓整流部1 1，係做爲將2個高壓電容器2 0串聯 連接的串聯電路，和把2個高壓二極管2 1串聯連接之串 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） P .^1 ^1 ^1 ^1 ^1 ^^1 ^1 ^1 ^1 1 ^1 » ^1 <1- - ^1 I (請先閲讀背面之注意事項再填寫本頁> —^丨訂----ί_ —線· -9- 經濟部智慧財產局員工消費合作社印製 4389 5 2 A7 ___B7__ 五、發明說明（7 ) 聯電路並聯連接的兩波倍電壓整流電路被構成，高壓電容 器2 0之共同連接點被連接在升壓變壓器5的二次繞組 2 2之一方，而高壓二極管2 1的共同連接點被連接在二 次繞組2 2之他方。並且，將從高壓整流部1 1被輸出高 壓直流電的正側電源線2 3，係和磁控管7之陽極7 a連 接，而負側電源線2 4，係和磁控管7之陰極7 b連接= —方面，陰極加熱用二次繞組2 5，係和磁控管7的 陰極7 b建接。 此時，因在升壓變壓器5的二次繞組2 2側’發生浮 遊容量（在第3圖以虛線表示），由其浮遊容量和電感’ 二次繞組2 2側之諧振頻率已定。在本實施例，係由調整 二次繞組2 2的電感，將由浮遊容量和電感而定之諧振頻 率，設定成反換器部1 0的開關頻率之5 OKHz的1 0 倍以上。 接著.，說明上述升壓變壓器5之構造。 第4圖爲升壓變壓器5的斜視圖，而第5圖爲升壓變 壓器之分解圖。在此等第4圖和第5圖，升壓變壓器5， 係由捲繞一次繞組1 9，二次繞組2 2及陰極加熱用二次 繞組25 (在第4圖和第5圖省略）的捲線軸26，心支 持構件27，第1分割心28 (僅在第5圖顯示），第2 分割心2 9，心帶3 0所構成。 捲線軸2 6，係成在連結形狀的一次繞組用捲線軸部 3 1及二次繞組用捲線軸部3 2 (僅在第1圖圖示）之兩 側將支持部33、 34—體化的形狀，在支持部33、 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） — 11—— — — — — — — — 裝 _ — I — 卜 I J 訂 _ I I — —--， (請先閲讀背面之注意事項再填寫本頁) -10- 4389 5 2 五、發明說明（8 ) 3 4之側面，形成有u字狀的心支持部3 5。一次繞組用 捲線軸部3 1和二次繞組用捲線軸部3 2之間，係以大隔 離部3 6被隔離=在一次繞組用捲線軸部3 1，捲繞有一 次繞組1 9，其一次繞組1 9的端部，被保持在支持部 3 3之側面所形成的保持部（未圖示），而突出在圖示下 方。 並且，二次繞組用捲線軸部3 2，係由2個小隔離部 3 7被隔離_成3個單位捲繞部3 2 a (僅在第1圖顯示） ’並且使之跨在各單位捲繞部3 2 a地被捲繞有1條二次 繞組。亦即，二次繞組2 2，係被分割爲3個單位繞組部 2 2 a，由將被分割的單位繞組部2 2 a串聯連接而被形 成。該二次繞組2 2的一方之端部，係和設成從捲線軸 2 6的大隔離部3 6之底面突出的端子部（未圖示）連接 ，而他方之端部係和設成從支持部3 4的底面突出之端子 部（未圖示）連接。 第6圖係顯示成一次繞組1 9的字支線3 8的構造。 在該第6圖，支線38，係將8條0 · 1mm以下的股 線（外周係被絕緣）3 8 a紋合而形成。 一方面，在第4圖和第5圖，捲線軸2 6的支持部 3 4之側面，形成有電纜保持部3 9，在其電纜保持部 3 9分別有2條陰極加熱用二次繞組2 5 (在第4圖和第 5圖省略）的一端，分別被保持而成爲向圓示下方突出。 此時，被保持在保持部3 9的2條陰極加熱用二次繞組 2 5之端部，係成爲由焊錫在印刷電路板4而做爲1條被 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） _(請先閲讀背面之注意事項再填寫本頁)Packing ----- ^! —Order · -------- Line I Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economy -4- r 4389 5 2 A7 ____B7_ V. Description of Invention (2) • (Please (Please read the notes on the back before filling in this page.) The present invention was developed in view of the above situation. The purpose of the invention is to use a half-bridge type inverter power supply to provide one side as a step-up transformer. Smaller microwave ovens that prevent magnetrons from starting longer. [Method for solving the problem] The present invention relates to an inverter power supply including a switching unit in which two switching elements and two resonant capacitor half-bridges are connected, and a high frequency of the slave inverter power supply. A step-up transformer that receives current from a primary winding and boosts and outputs it from a secondary winding, and a high-voltage rectifier that rectifies a high-voltage high-frequency current boosted by the boost transformer, and is applied by the high-voltage rectifier. In the state of the rectified high-voltage DC voltage, microwaves are irradiated to the microwave tube of the magnetron of the conditioning room, characterized in that the aforementioned step-up transformer is a winding spool in which a primary winding and a secondary winding are wound in parallel, and Inserted into the core insertion hole of the spool, the first divided core and the second divided core with the gap on the secondary winding side are formed in the inserted state (the first patent application scope). When printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, the high-frequency current output from the inverter power supply will be boosted by the primary winding of the step-up transformer and used as the high-voltage high-frequency from the secondary winding. Current output. At this time, in the step-up transformer, the gap between the first split core and the second split core is located on the secondary winding side wound on the spool, and the self-coupling coefficient of the secondary winding side will be reduced and the secondary winding side will be reduced. The self-resonant frequency has been shifted to the high-frequency side. As a result, the resistance on the secondary winding side becomes large, and the Q 自 of the self-resonance on the secondary winding side of the step-up transformer becomes small, so that the occurrence of ringing due to self-resonance can be suppressed. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -5- 4389 5 2 A7 Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs B7 V. Description of the invention (3) Therefore, as a boost The transformer will be able to use a small one with a small insulation withstand voltage, and because the step-up rate will not decrease, the current for cathode heating will not decrease, and the startup time of the magnetron will not become longer. In the above configuration, the core gap of the step-up transformer is ideally located at the slightly center of the secondary winding (the second in the scope of patent application). With this configuration, the Q 値 of the self-resonance on the secondary winding side of the step-up transformer can be greatly reduced, and ringing can be effectively prevented. And "the resonance frequency of the secondary winding side of the step-up transformer from the floating capacity and inductance is ideally more than 10 times the switching frequency of the inverter power supply (item 3 in the scope of patent application). Since the floating capacity of the secondary winding side of the boost transformer and the self-resonant frequency of the inductor are largely deviated from the switching frequency of the inverter power supply, the phase of the increase in the resistance of the secondary winding side of the core gap The multiplication effect can greatly reduce the Q 値 of self-resonance. In addition, the high-voltage rectification unit is ideally a two-wave voltage rectification circuit formed by two high-voltage capacitors and two high-voltage diodes (item 4 of the scope of patent applications) With this configuration, the secondary side circuit of the step-up transformer will operate symmetrically on the positive and negative sides, and it can work with the symmetrical operation of the half-bridge inverter power supply of the primary side circuit. The operation is symmetrical. Therefore, the two switching elements and two resonant capacitors used in the half-bridge inverter power supply and the two high-voltage capacitors used in the high-voltage rectifier section And high-voltage diodes, they can use the same component 1 separately for easy component management. This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) — — — — — —---- -Equipped-111 ·· — — Ordered! Line 2 Please read the notes on the back before filling out this page) -ό-4389 5 2 A7 _____B7_____ V. Description of the invention (4) (谙 Read the notes on the back before filling in This page> The end of the secondary winding of the step-up transformer is located on the side of the primary winding, and is preferably connected to a common connection point of the high-voltage capacitors connected in series that constitute a two-wave voltage rectifier circuit. (No. 5 in the scope of patent application) According to such a structure, the secondary winding electrostatically combined with the primary winding will be connected to the microwave oven frame at high frequency, and the voltage resonance energy at the self-resonant frequency of the secondary winding will be It is difficult to leak to the primary side * and prevent the step-down transformer from degrading the conversion efficiency. Furthermore, the secondary winding of the step-up transformer is ideally formed by connecting most unit windings in series ( Please refer to the patent scope item 6). According to this structure, the interlayer voltage of the entire secondary winding will be reduced, the electrostatic capacity will be reduced isotropically, the resistance to high frequency will be increased, and the self-winding side of the secondary winding will be reduced. Resonance Q 値 can suppress ringing. Furthermore, the primary winding of the step-up transformer is ideally formed by twisting strands of less than 0.1mm with 8 or more dedicated branch wires (item 7 in the scope of patent application) According to such a structure, the secondary winding resistance 印 printed by the employee's consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs at the start of the magnetron can be increased, and the operating frequency of the inverter power supply (such as 5 Ο Κ Η z), the secondary winding resistance 抑制, is suppressed to about 1.2 times the low frequency. That is, because high-frequency current will be passed through the secondary winding of the step-up transformer, although the effect of the skin effect and the proximity effect will become obvious, but by reducing the strand diameter and increasing the number of strands, the skin effect can be avoided And proximity effects. This paper size is in accordance with Chinese National Standard (CNS) A4 (210 X 297 mm) 4389 5 2 A7 __ _B7__ 'V. Description of the invention (5) 乂 Please read the notes on the back before filling this page) At this time, try your best Reduce the diameter of the stranded wire. Although the resistance of the secondary winding at the self-resonant frequency will increase and be ideal, on the other hand, because the resistance of the operating frequency needs to be reduced, the thinning of the stranded wire must be within a certain range. In this way, the cable-to-branch line is ideal for ensuring that the resistance component at the operating frequency and the resistance ratio of the self-resonant frequency of the secondary winding make the loss at the operating frequency sufficiently small. Furthermore, it is ideal to connect a series circuit composed of a resistor and a capacitor between the primary winding of the step-up transformer or between the primary winding and the high-voltage capacitor of the half-bridge inverter power supply (item 8 in the scope of patent application) . According to this structure, in the primary winding of the step-up transformer, the voltage change rate of a large part of the voltage change rate of the voltage waveform (absolutely large part of d V / dt) can be suppressed, so that the voltage applied to the The high frequency component of the voltage waveform of the primary winding to the operating frequency. As a result, the vibration amplitude of the secondary winding to the self-resonant frequency will be reduced, and the ringing component of the secondary winding voltage waveform will be suppressed. Unwanted high voltage will not occur, and the magnetron can be started quickly. [Embodiment of the invention] Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs An embodiment of the present invention will be described below with reference to the drawings. Figure 2 shows the microwave oven squinting. In this second figure, the box 1 is formed in a box shape with an open front, a conditioning room 2 'is provided inside the box 1, and a machine room 3 is formed on the side of the box 1. _ A printed circuit board 4 ′ is provided at the bottom of the machine room 3, and a step-up transformer 5 is mounted on the printed circuit board 4. This paper size applies to China National Standard (CNS) A4 (210x297 mm) -8- Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 4389 5 2 A7 B7 V. Description of the invention (6) In the mechanical room 3, A waveguide 6 ′ fixed to face the conditioning chamber 2 becomes a microwave from the magnetron 7 and is irradiated to the conditioning chamber 2 through the waveguide 6. FIG. 3 is a schematic diagram showing a schematic electrical configuration of a microwave oven. In this third figure, in addition to the step-up transformer 5, the printed circuit board 4 is actually provided with a rectifier section 8, an inverter control section 9, a switching section 10, and a high-voltage rectification section 11 by the inverter control section. 9 and the switching unit 10 constitute an inverter power source. Rectifier_8. After commercial AC power is fully rectified by the diode bridge circuit, it is smoothed by the reactor and smoothing capacitor (both not shown), and DC power is output to the power line 1 2, 1 3. The inverter control section 9 outputs a switching signal of a predetermined frequency (for example, 50 kHz) to the switching section 10. The switching unit 10 is a series circuit in which two switching elements 14 are connected in series between the power supply lines 1 2 and 13 and a series circuit in which two resonance capacitors 15 are connected in series. The common connection point of 14 and the common connection point of the resonant capacitor 15 are half bridge types of output terminals. At this time, a flywheel diode 16 of the illustrated polarity is connected between the collector and the emitter of the switching element 14. In addition, a series circuit formed by a capacitor 17 and a resistor 18 is connected between a common connection point of the switching elements 14 and the power supply line 13. The primary windings 19 of the step-up transformer 5 are connected to the output terminals of the switching section 10, respectively. The high-voltage rectifier 11 is a series circuit that connects two high-voltage capacitors 20 in series, and a string that connects two high-voltage diodes 21 in series. The paper size is applicable to China National Standard (CNS) A4 (210 X 297). %) P. ^ 1 ^ 1 ^ 1 ^ 1 ^ 1 ^^ 1 ^ 1 ^ 1 ^ 1 1 ^ 1 »^ 1 < 1--^ 1 I (Please read the precautions on the back before filling out this page > ^ 丨 定 ---- ί_ —line · -9- Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 4389 5 2 A7 ___B7__ V. Description of the invention (7) A two-wave voltage rectifier circuit connected in parallel to the circuit is The common connection point of the high-voltage capacitor 20 is connected to one of the secondary windings 22 of the step-up transformer 5, and the common connection point of the high-voltage diode 21 is connected to the other of the secondary winding 22. The high-voltage rectifier 11 is connected to the anode 7 a of the magnetron 7 by a positive-side power line 2 3 that outputs high-voltage direct current, and the negative-side power line 2 4 is connected to the cathode 7 b of the magnetron 7 = — On the other hand, the secondary winding 25 for cathode heating is connected to the cathode 7 b of the magnetron 7. At this time, the secondary winding 2 2 of the step-up transformer 5 'The occurrence of floating capacity (indicated by a dashed line in Figure 3) is determined by its floating capacity and inductance.' The resonance frequency on the secondary winding 22 side has been determined. In this embodiment, the inductance of the secondary winding 22 is adjusted by The resonance frequency depending on the floating capacity and inductance is set to be more than 10 times 5 OKHz of the switching frequency of the inverter section 10. Next, the structure of the above-mentioned step-up transformer 5 will be described. A perspective view, and Fig. 5 is an exploded view of the step-up transformer. Here, in Figs. 4 and 5, the step-up transformer 5 is formed by winding a primary winding 19, a secondary winding 22, and a cathode heating 2 Bobbin 26 of secondary winding 25 (omitted in Figures 4 and 5), heart support member 27, first split heart 28 (shown only in Figure 5), second split heart 2 9 and heart band 3 0 The bobbin 26 is connected to the supporting parts 33, 34 on both sides of the bobbin part 3 1 for the primary winding and the bobbin part 3 2 for the secondary winding (only shown in the first figure). Incorporating the shape, in the support section 33, this paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) — 11—— — — — — — — — — Equipment _ — I — Bu IJ Order _ II — —--, (Please read the notes on the back before filling this page) -10- 4389 5 2 V. Description of the invention (8 ) The side of 3 4 is formed with a U-shaped heart support portion 35. The primary winding reel portion 31 and the secondary winding reel portion 3 2 are separated by a large isolation portion 3 6 = between The primary winding bobbin section 31 is wound with a primary winding 19, and an end portion of the primary winding 19 is held by a holding portion (not shown) formed on a side surface of the support portion 3 3 and protrudes in the drawing. Shown below. In addition, the bobbin section 3 2 for the secondary winding is isolated by two small isolation sections 37 to form three unit winding sections 3 2 a (shown only in the first figure), and it is placed across each unit. One secondary winding is wound around the winding portion 3 2 a. That is, the secondary winding 2 2 is divided into three unit winding portions 2 2 a and is formed by connecting the divided unit winding portions 2 2 a in series. One end portion of the secondary winding 22 is connected to a terminal portion (not shown) provided to protrude from the bottom surface of the large isolation portion 36 of the winding reel 26, and the other end portion is connected to the terminal portion (not shown). Terminal portions (not shown) protruding from the bottom surface of the support portion 34 are connected. FIG. 6 shows the structure of a branch line 38 which is a primary winding 19. In FIG. 6, the branch line 38 is formed by weaving eight strands (the outer circumference is insulated) 3 8 a of 0. 1 mm or less. On the other hand, in FIGS. 4 and 5, the side of the support portion 34 of the spool 26 is provided with a cable holding portion 39, and the cable holding portion 39 includes two secondary windings 2 for cathode heating. One end of 5 (omitted in FIGS. 4 and 5) is held so as to protrude below the circle. At this time, the ends of the two cathode heating secondary windings 25 held at the holding portion 39 are made of solder on the printed circuit board 4 as one, and the Chinese national standard (CNS) is applied to this paper size. A4 size (210 X 297 mm) _ (Please read the precautions on the back before filling this page)
裝.I ---I 訂--------I I 經濟部智慧財產局員工消費合作社印製 -11 - 4 3 89 5 2 A7 ___B7__ 五、發明說明（9 ) 連接，以其連接狀態成爲陰極加熱用二次繞組2 5將圍繞 形成在捲線軸2 6之心支持部3 5。並且，在陰極加熱用 二次繞組2 5的一端，連接有連接器（未圖示），成爲將 和磁控管7之陰極7 b連接。 心支持構件2 7，係成具有臂部2 7 a的3字狀，由 其臂部2 7 a嵌合在捲線軸2 6形成的心支持部3 5之開 口，成爲將對捲線軸26—體化。 —方®，第1分割心2 8和第2分割心2 9，係分別 成3字狀。此等分割心28、 29之臂部28a、 29a 係形成圓柱狀，形成一方的分割心2 8之臂部2 8 a ，比 他方的分割心2 9之臂部2 9 a長。此等分割心2 8、 2 9的臂部2 8 a、2 9 a ，係將被***捲線軸2 6之心 ***孔2 6 a者，在其***狀態，各分割心2 8、2 9的 臂部28a、 29a將擋接在心***孔26a內被形成之 停止器部（未圖示）及形成在心支持構件2 7所形成的停 止器部（未圖示），並且成爲將由形成在捲線軸2 6的心 支持部3 5和心支持構件2 7被定位。 在此，第1圖係顯示升壓變壓器5的斷面。在該第1 圖，***捲線軸2 6之第1分割心2 8和第2分割心2 9 ，係擋接在捲線軸2 6的心***孔2 6 a及心支持構件 2 7所形成之未圖示的停止器部，以其擋接狀態被形成心 隙4 0。此時，心隙4 0係位於略對應二次繞組2 2之中 央。 如上述地構成的升壓變壓器5，係對形成在捲線軸 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） _ (請先K讀背面之注意事項再填寫本頁)I. --- I Order -------- II Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs -11-4 3 89 5 2 A7 ___B7__ V. Description of the invention (9) Connection, with its connection status The secondary winding 25 for cathode heating will surround the support portion 35 formed at the center of the bobbin 26. A connector (not shown) is connected to one end of the secondary winding 25 for cathode heating, and is connected to the cathode 7 b of the magnetron 7. The heart support member 27 is formed in a 3-character shape with an arm portion 2 7 a, and the opening of the heart support portion 3 5 formed by the arm portion 2 7 a being fitted on the reel 26 is a pair of reels 26— Body. —Fang®, the first divided heart 2 8 and the second divided heart 2 9 are respectively formed into 3 figures. The arms 28a, 29a of these split hearts 28, 29 are formed in a columnar shape, and the arms 28a of one split heart 28 are longer than the arms 29a of the other split hearts 29. The arms 2 8 a, 2 9 a of these split hearts 2 8, 2 9 are those who will be inserted into the core insertion holes 2 6 a of the spool 2 6, and in the inserted state, each split heart 2 8, 2 9 The arm portions 28a, 29a will stop the stopper portion (not shown) formed in the heart insertion hole 26a and the stopper portion (not shown) formed in the heart support member 27, and will be formed on the winding line. The heart support part 35 and the heart support member 27 of the shaft 26 are positioned. Here, FIG. 1 shows a cross section of the step-up transformer 5. In the first figure, the first divided core 2 8 and the second divided core 2 9 inserted into the spool 2 6 are formed by the core insertion hole 2 6 a and the core supporting member 27 which are connected to the spool 2 6. A stopper portion (not shown) is formed with a heart gap 40 in its blocking state. At this time, the heart gap 40 is located at the center of the secondary winding 22. The step-up transformer 5 constructed as described above is for the reel formed on the spool. This paper size applies the Chinese National Standard (CNS) A4 (210 X 297 mm) _ (Please read the precautions on the back before filling this page)
裝----^---'—訂!1--11 I 經濟部智慧財產局員工消費合作社印製 -12- 經濟部智慧財產局員工消費合作社印製 4 3 8 9 5 2 A7 ___ B7 五、發明說明（10 > 2 6的支持部3，3 4之螺固部4 1 (僅圖示在第4圖和 第5圖），由從印刷電路板4的背側螺固，而裝載在印刷 電路板4。此時，在第1、第2分割心28、 29之外側 面’形成有溝部2 8 b、2 9 b，由心帶3 0嵌入在其溝 部28 a、2 9b，成爲各分割心2 8、2 9將和捲線軸 2 7 —體化。並且’心帶3 0係成爲將被焊錫在印刷電路 板4，成爲以其焊錫狀態，升壓變壓器5在印刷電路板4 ’以各分ΙΪ心2 8、2 9傾斜之狀態被裝載。 一方面’升壓變壓器5的一次繞組1 9，二次繞組 2 2 ’係經由形成在印刷電路板4的圖型，和所定之電子 零件連接。 亦即，一次繞組i 9，係由焊錫在印刷電路板4，而 和開關部1 0的開關元件1 4之共同連接點與諧振電容器 1 5的共同連接點連接。 並且，與二次繞組2 2連接而從捲線軸2 6的底面突 出之端子部，將由焊錫在印刷電路板4，經由圖型連接在 高壓整流部11的高壓電容器20之共同連接點和髙壓二 極管21之共同連接點。 陰極加熱用二次繞組2 5，係由焊錫在印刷電路板4 ’經由圖型和高壓電容器2 0及高壓二極管2 1之共同連 接點連接。 接著，說明上述構成之作用。 以接通商用交流電源的狀態操作啓動開關時，反應器 控制部9將對開關部1 〇輸出開關信號，故開關部1 0將 本紙張尺度適用中國國家標準（CNS>A4規格（210 X 297公釐） -------I--I 1. ^ I I I l· ---訂.！----線— (請先¾.讀背面之注意事項再填寫本頁) -13- A7 438952 ____B7______ 五、發明說明（11 ) 把從整流部8之直流電壓以5 0 kH Z開關。此時，在第 1開關元件1 4的閉合狀態，升壓變壓器5之一次繞組 1 9，將有經由諧振電容器1 5的電流，和附隨第1諧振 電容器1 5放電之電。並且，在第2開關元件1 4的閉合 狀態，升壓變壓器5之一次繞組1 9，將有經由第2諧振 電容器15的電向相反方向通電•並且附隨第1詣振電容 器1 5放電之電通尙相反方向。 如此璀，在升壓變壓器5的一次繞組1 9，將按照開 關元件1 4之開關動作通5 OKH z的高頻電，從二次繞 組1 9將輸出按照升壓率之高壓高頻電=> 而且，將從陰極 加熱用二次繞組2 5，向磁控管7之陰極7 b輸出高頻電 ，故陰極7 b將被加熱。 此時，在開關部1 0的輸出端子，連接有由電容器 1 7和電阻1 8而成之串聯電路，故能控制在升壓變壓器 5的一次繞組1 9電壓波形之電壓變化率大的部份（d v / d t之絕對値大的部份）之電壓變化率（參照第7圖） 〇 一方面，成高壓整流部1 1的兩波信電壓整流電路， 係進行組合半波倍電壓整流電路之動作者，成爲將從升壓 變壓器5的二次繞組2 2按照升壓率發生之高壓高頻電， 利用高壓電容器2 0的充電提高，而輸出高壓直流電壓。 然後，以從高壓整流部1 1對磁控管7施加高壓直流 電壓的狀態，磁控管7啓動時，磁控管7將會振盪，而成 爲將從磁控管7向調理室2內照射微波。 本紙張尺度適用中國國家標準（CNS)A4说格（210 X 297公釐） -------- -----裝 i·— 卜 — Li 訂 * — !1—線 乂請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 -14- 4389 5 2 A7 __ B7 五、發明說明（12 ) (請先閱讀背面之注意事項再填寫本頁) 可是，在升壓變壓器5的二次繞組2 2，如在第3圖 以虛線表示地發生有浮遊容量，具有發生在升壓變壓器5 的二次繞組2 2之電壓，會由於和浮遊容量的自諧振而發 生所謂振鈴的不需要諧振之虞。 第8圖係顯示在磁控管啓動時的升壓用變壓器5之一 次側電壓和二次側電壓。再者，一次側電壓和二次側電壓 的電壓水準不同。此時，升壓變壓器5之二次側電壓，係 以成爲將一7次側電壓加倍升壓率的電壓（在第8圖（b ) 中以實線表示）爲理想，可是在發生振鈴時，二次繞組電 壓將因振鈴（在同圖中（b )以虛線表示）而發生比本來 應有電壓高之電壓，其電壓的大小將依所定之參數而定。 亦即，振鈴的發生電壓，將依一次側電壓和升壓率及自諧 振之Q値而定。此等中，一次側電壓和升壓率係由開關動 作的定常動作時之條件而定，故僅自諧振的Q値爲獨立參 數，將能夠由控制自諧振的Q値而抑制振鈴之發生電壓。 經濟部智慧財產局員工消費合作社印製 具體上，在升壓變壓器5的二次繞組2 2側之自諧振 的Q値大時，如第9圖（b)所示，雖然振鈴大，可是自 諧振之Q値變小時，如同圖（c )所示地振鈴將變小。因 此，可知要減小振鈴時，減小自諧振之Q値將有效。 因此，在本實施例，係如下地由減小升壓變壓器5在·. 二次側的自諧振之Q値，而抑制發生振鈴。 亦即，著眼於升壓變壓器5時，如第1圖所示，*** 入捲線軸2 6的第1、第2分割心2 8、2 9間之心隙 3 9，因位於二次繞組2 2側’故比使心隙3 9位於一次 本紙張尺度適用中國國家標準（CNS)A4規格mo X 297公釐） -15- 4389 5 2 a7 __B7____ 五、發明說明（13 ) (請先閱讀背面之注意事項再填寫本頁) 繞組2 9側，能減低二次繞組2 2之自結合係數，二次繞 組2 2的自諧振頻率，將會向高頻側移動。由此，二次繞 組2 2之電阻將變大，故升壓變壓器5的二次繞組2 2之 自諧振的Q値將會變小，而能有效地振制由自諧振之振鈴 發生。 在實驗已確認，在使升壓變壓器5的心隙3 9位於二 次繞組2 2側時和位於一次繞組時，以分別調整爲使心隙 成爲一次_組1 9的洩漏電感（將二次繞組2 2開放時之 一次繞組電感）會成爲同値的條件，能使洩漏二次電感之 値從1 2 m Η縮小爲1 0 m Η。 亦即，由於洩漏二次電感變小，將能提高升壓變壓器 5的二次繞組2 2側之諧振頻率，故能相對地使自諧振的 Q値變小。 經濟部智慧財產局員工消費合作社印製 根據如此之本實施例時，由於使***在升壓變壓器5 的捲線軸2 6之心***孔2 6 a的第1分割心2 8及第2 分割心2 9的心隙3 9位於二次繞組2 2側，使洩漏二次 電感變小，升壓變壓器5的二次繞組2 2側之自諧振頻率 將變高，相對地能使自諧振之Q値變小。因此，能夠在磁 控管啓動時，抑制在升壓變壓器5之二次繞組2 2發生振 鈴，做爲升壓變壓器5能夠使用小形者。 此時，因使之未調整一次側電壓而抑制在二次側發生 的振鈴，能使升壓變壓器5之升壓率不降低而磁控管7的 陰極加熱用電流不降低地實施，也不會有磁控管7之啓動 時間會變長的問題發生。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐〉 -16- 4389 5 2 A7 B7 五、發明說明（14 ) 並且，因使第1、第2分割心2 8、2 9間之心隙 3 9位於升壓變壓器5的二次繞組2 2之略中央，故能使 升壓變壓器5的二次繞組2 2側之電阻做爲最大，最能抑 制發生振鈴。 而且，將升壓變壓器5的二次繞組2 2側之電感調整 爲由升壓變壓器5的二次繞組2 2側之浮遊容量和電感的 諧振頻率，會成爲開關部1 0之開關頻率的1 0倍以上， 故升壓變壓器5之二次繞組2 2側的諧振頻率將從開關部 1 0之開關頻率大幅錯開，由和上述升壓變壓器5的心隙 3 9之位置調整的自諧振之Q値的降低之相乘效果，能使 自諧振的Q値大幅降低，而更能抑制發生振鈴。 更且，做爲高壓整流部1 1使之用兩波倍電壓整流電 路，將成升壓變壓器5的二次側之高壓整流部11，對正 側，負側將對稱地動作，與一次側電路的開關部1 0之對 稱動作一起，能夠把所有的動作做爲對稱動作。因此，在 半電橋形之開關部1 0所使用的2個開關元件1 4及2個 諧振電容器1 5，以及在高壓整流部1 1所使用的2個高 壓電容器2 0和高壓二極管2 1 ，將能分別使用同一元件 ，而能容易地進行零件管理。 並且，升壓變壓器5的二次繞組2 2之端部中，位於 一次繞組1 9側的端部，因做爲連接在成高壓整流部1 1 的兩波倍壓整流電路之高壓電容器2 0的串聯電路之共同 連接點，和一次繞組1 9靜電結合的二次繞組2 2，成爲 與微波爐之框架高頻地被連接。由此，在二次繞組2 2的 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） <請先閱讀背面之注意事項再填寫本頁)Equipment ---- ^ ---'-- Order! 1--11 I Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs-12- Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 3 8 9 5 2 A7 ___ B7 V. Description of the invention (10 > 2 6 of the supporting portions 3, 3 4 of the screwing portion 4 1 (only shown in Figs. 4 and 5) are screwed from the back side of the printed circuit board 4, and It is mounted on the printed circuit board 4. At this time, groove portions 2 8 b and 2 9 b are formed on the outer side surfaces of the first and second divided cores 28 and 29, and a heart band 30 is embedded in the groove portions 28 a and 2 9b. Each of the divided cores 2 8 and 2 9 will be integrated with the reel 2 7. And the 'heart belt 3 0' will become the solder on the printed circuit board 4, and in its soldered state, the step-up transformer 5 will be on the printed circuit. The board 4 is loaded in a state where the cores 28, 29 are inclined. On the one hand, the primary winding 19 and the secondary winding 2 2 of the step-up transformer 5 are formed on the printed circuit board 4 through a pattern, It is connected to predetermined electronic components. That is, the primary winding i 9 is soldered on the printed circuit board 4, and the common connection point with the switching element 14 of the switching section 10 and the resonant capacitor 15 are common. It is connected to the connection point. Also, the terminals connected to the secondary winding 22 and protruding from the bottom surface of the spool 26 are soldered to the printed circuit board 4 and connected to the high-voltage capacitor 20 of the high-voltage rectifier 11 via a pattern. The common connection point between the connection point and the high voltage diode 21. The secondary winding 25 for cathode heating is connected by solder on the printed circuit board 4 'through the pattern and the common connection point of the high voltage capacitor 20 and the high voltage diode 21. Next When the start switch is operated with the commercial AC power on, the reactor control unit 9 will output a switch signal to the switch unit 10, so the switch unit 10 applies the Chinese paper standard (CNS & gt) to this paper size. ; A4 size (210 X 297 mm) ------- I--I 1. ^ III l · --- order.! ---- line— (please read ¾. (Fill in this page) -13- A7 438952 ____B7______ 5. Description of the invention (11) Switch the DC voltage from the rectifier 8 to 50 kH Z. At this time, in the closed state of the first switching element 14, the step-up transformer 5 One primary winding 19, there will be a current through the resonant capacitor 15 And the electricity accompanying the discharge of the first resonance capacitor 15. In the closed state of the second switching element 14, the primary winding 19 of the step-up transformer 5 will have the electricity passing through the second resonance capacitor 15 in the opposite direction. Energize • And the electric current accompanying the discharge of the first vibration capacitor 15 is reversed. So bright, the primary winding 19 of the step-up transformer 5 will pass 5 OKH z high-frequency power in accordance with the switching action of the switching element 14 From the secondary winding 19, the high-voltage and high-frequency electricity according to the step-up rate will be output. Also, the high-frequency electricity will be output from the secondary winding 25 for heating the cathode to the cathode 7b of the magnetron 7, so the cathode 7 b will be heated. At this time, a series circuit composed of a capacitor 17 and a resistor 18 is connected to the output terminal of the switching section 10, so it can be controlled in a section where the voltage change rate of the voltage waveform of the primary winding 19 of the step-up transformer 5 is large. (Absolutely large part of dv / dt) of the voltage change rate (refer to Figure 7) 〇 On the one hand, the two-wave signal voltage rectification circuit that becomes the high-voltage rectification section 11 is a combined half-wave voltage rectification circuit The operator is a high-voltage high-frequency power generated from the secondary winding 22 of the step-up transformer 5 at a step-up rate, and is charged by the high-voltage capacitor 20 to output a high-voltage DC voltage. Then, in a state where a high-voltage DC voltage is applied to the magnetron 7 from the high-voltage rectifier 11, when the magnetron 7 is started, the magnetron 7 will oscillate and irradiate the magnetron 7 into the conditioning chamber 2. microwave. This paper size applies the Chinese National Standard (CNS) A4 scale (210 X 297 mm) -------- ----- Install i · — Bu — Li Order * —! 1—Line first Read the notes on the back and fill in this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs -14- 4389 5 2 A7 __ B7 V. Invention Description (12) (Please read the notes on the back before filling this page) But In the secondary winding 22 of the step-up transformer 5, as shown by the dashed line in FIG. 3, there is a floating capacity. The voltage of the secondary winding 22 in the step-up transformer 5 is generated by the There is a possibility that the so-called ringing does not require resonance. Fig. 8 shows one of the secondary voltage and the secondary voltage of the step-up transformer 5 when the magnetron is started. Furthermore, the voltage levels of the primary voltage and the secondary voltage are different. At this time, the secondary-side voltage of the step-up transformer 5 is preferably a voltage (indicated by a solid line in FIG. 8 (b)) that doubles the step-up voltage of the 7th-side voltage, but when ringing occurs, The voltage of the secondary winding will be higher than the original voltage due to ringing (in the same figure (b) is indicated by a dashed line), and its voltage will depend on the determined parameters. That is, the voltage at which the ringing occurs will depend on the primary voltage, the boost rate, and Q 値 of the self-resonance. Among these, the primary voltage and step-up rate are determined by the conditions during the normal operation of the switching operation. Therefore, only the self-resonant Q 値 is an independent parameter, and the self-resonant Q 値 can be controlled to suppress the ringing voltage . Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Specifically, when the self-resonant Q of the secondary winding 22 of the step-up transformer 5 is large, as shown in FIG. 9 (b), although the ringing is large, As the resonance Q 値 becomes smaller, the ringing becomes smaller as shown in Fig. (C). Therefore, it is known that to reduce the ringing, it is effective to reduce the self-resonance Q 値. Therefore, in this embodiment, the self-resonance Q 値 of the booster transformer 5 on the secondary side is reduced to suppress the occurrence of ringing as follows. That is, when focusing on the step-up transformer 5, as shown in FIG. 1, the first and second split cores 2 8 and 2 9 inserted into the reel 2 6 are located at the gap 3 9 between the secondary winding 2 and the secondary winding 2 2 sides' so that the heart gap 3 9 is located once. This paper scale applies Chinese National Standard (CNS) A4 specifications mo X 297 mm. -15- 4389 5 2 a7 __B7____ 5. Description of the invention (13) (Please read the back first Please note this page and fill in this page again) The 9 side of winding 2 can reduce the self-coupling coefficient of the secondary winding 22, and the self-resonant frequency of the secondary winding 22 will move to the high frequency side. As a result, the resistance of the secondary winding 22 will increase, so the Q 値 of the self-resonance of the secondary winding 22 of the step-up transformer 5 will be small, and the ringing caused by the self-resonance can be effectively suppressed. It has been confirmed in experiments that when the gap 3 9 of the step-up transformer 5 is located on the secondary winding 2 2 side and when it is located on the primary winding, the leakage inductance is adjusted so that the gap is the primary_group 1 9 (the secondary When the winding 22 is opened, the primary winding inductance) will become the same condition, which can reduce the leakage secondary inductance from 12 m to 10 m. That is, since the leakage secondary inductance becomes smaller, the resonance frequency of the secondary winding 22 side of the step-up transformer 5 can be increased, so that Q 値 of the self-resonance can be relatively small. According to the embodiment of the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, according to this embodiment, the first splitting center 28 and the second splitting center of the spool 2 6 inserted in the step-up transformer 5 are inserted into the hole 2 6 a. The gap 9 of 9 is located on the 2nd side of the secondary winding 2 to reduce the leakage secondary inductance. The self-resonant frequency of the 2nd side of the secondary winding 22 of the boost transformer 5 will be higher, which can relatively make the Q of the self-resonance値 becomes smaller. Therefore, when the magnetron is started, ringing in the secondary winding 22 of the step-up transformer 5 can be suppressed, and a small-sized one can be used as the step-up transformer 5. At this time, ringing occurring on the secondary side is suppressed because the primary-side voltage is not adjusted, so that the step-up rate of the step-up transformer 5 is not reduced, and the cathode heating current of the magnetron 7 is not reduced. There is a problem that the startup time of the magnetron 7 becomes longer. This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm> -16- 4389 5 2 A7 B7 V. Description of the invention (14) In addition, because of the first and second split heart 2 8, 2 9 The intermediate gap 39 is located at the slightly center of the secondary winding 22 of the step-up transformer 5, so that the resistance on the secondary winding 22 side of the step-up transformer 5 can be maximized, and the occurrence of ringing can be suppressed most. The inductance on the secondary winding 22 side of the step-up transformer 5 is adjusted so that the resonant frequency of the floating capacity and inductance on the secondary winding 22 side of the step-up transformer 5 will be more than 10 times the switching frequency of the switching section 10 Therefore, the resonance frequency of the secondary winding 22 side of the step-up transformer 5 will be greatly deviated from the switching frequency of the switching section 10, and the self-resonant Q 値 will be adjusted by the position of the heart gap 39 of the step-up transformer 5. The reduced multiplication effect can greatly reduce the self-resonant Q 値, and can further suppress the occurrence of ringing. Moreover, as a high-voltage rectifier section 11 using a two-wave voltage rectifier circuit, it will become a step-up transformer 5 The high-voltage rectification part 11 on the secondary side will act symmetrically on the positive side and the negative side, and The symmetrical operation of the switching part 10 of the circuit together can make all the actions symmetrical. Therefore, the two switching elements 14 and two resonant capacitors 15 used in the half-bridge-shaped switching part 10, And the two high-voltage capacitors 20 and the high-voltage diodes 2 1 used in the high-voltage rectification section 11 can use the same components respectively, and can easily manage the parts. In addition, the secondary windings 22 of the step-up transformer 5 Among the ends, the end located on the 19 side of the primary winding is used as a common connection point of the series circuit of the high-voltage capacitor 20 connected to the two-wave voltage doubler rectifying circuit forming the high-voltage rectifying section 11 and the primary winding 19 The electrostatically coupled secondary winding 22 is connected at high frequency to the frame of the microwave oven. Therefore, the paper size of the secondary winding 22 is subject to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) & lt (Please read the notes on the back before filling out this page)
* I I I I I l· I f I I I I 線- 經濟部智慧財產局員工消費合作社印製 -17- 經濟部智慧財產局員工消費合作社印製 4 3 8 9 5 2 a7 _____B7__ 五、發明說明（15 ) 自諧振頻率之電壓諧振能，將不易向一次側洩漏，而能防 止升壓變壓器5的變換效率降低。 而且，升壓變壓器5之二次繞組2 2，係以被分割成 多數的單位繞組部2 2 a之狀態被串聯連接，故將減低二 次繞組2 2全體的層間電壓，靜電容量將等値性地降低， 對高頻之電阻將變大，而能減低二次繞組2 2側的自諧振 之Q値。 並且「升壓變壓器5的一次繞組，係將0.1mm以 下之肢線絞合8條以上的李支線，故能一面確保在動作頻 率之電阻成份，和在二次繞組的自諧振頻率之電阻値比， 而使在動作頻率的損失充份地小。 更且，因在升壓變壓器5的一次繞組1 9和半電橋形 之開關部1 0的諧振電容器1 5之間，連接由電容器1 7 和電阻1 8所成的串聯電路，故能抑制對加在一次繞組 1 9的電壓波形之動作頻率的高頻成份，對二次繞組2 2 之自諧振頻率的振動振幅將變小，而能抑制二次繞組2 2 的電壓波形之振鈴成份。因此，將不會發生不要的高電壓 ，而能迅速地進行磁控管7之啓動。 本發明，並不限於上述實施例，而能夠如下地變形或 擴張。 做爲高壓整流部11，也可以使用半波倍電壓整流電 路。 也能夠將由電容器17及電阻18而成的串聯電路， 連接在升壓變壓器5之一次繞組19間。 本紙張尺度適用中國國家標準（CNS)A4規格（21〇χ 297公釐） -----------裝·--I l· I — I 訂· I I--I I--線— (請先5?讀背面之注意事項再填寫本頁) -18- 4389 5 2 a? B7 五、發明說明（16 ) 〔發明之效果〕 <請先恥讀背面之注意事項再填寫本頁) 如上述說明所顯示，根據本發明之微波爐時，由使插 入升壓變壓器的心***孔之第1分割心和第2分割心間的 心隙位於二次繞組側，減低二次繞組之自結合係數，使二 次繞組側的自諧振頻率移動至高頻側，故在使用半電橋形 的反換器電源之微波爐，雖然做爲升壓變壓器使用絕綠耐 壓小者，蔣發揮能夠防止磁控管啓動時間變長之優異效果 〔圖面之簡單說明〕 〔第1圖〕 係在本發明的一實施例之升壓變壓器的斷面圖。 〔第2圖〕 以門之開放狀態顯示的微波爐之斜視圖。 〔第3圖〕 將全體的電構成槪略顯示之電路圖。 〔第4圖〕 經濟部智慧財產局具工消費合作社印製 升壓變壓器之斜視圖。 〔第5圖〕 升壓變壓器的分解斜視圖。 〔第6圖〕 顯示李支線的構造之斜視圖。 〔第7圖〕 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -19- 4 3 3 9 5 2 A7 B7__ 五、發明說明（17 ) 顯示升壓變壓器的一次側電壓之波形圖。 〔第8圖〕 (請先亂讀背面之注意事項再填寫本頁) 顯示對應於升壓變壓器的一次側電壓之二次側電壓的 波形圖。 〔第9圖〕 以Q値不同的狀態顯示之第8圖相當圖。 〔圖號說明Ί 5 升壓變壓器 7 磁控管 10 開關部（反換器電源） 11 整流部 14 開關元件 1 5 諧振電容器 19 一次繞組 2 0 高壓電容器 2 2 二次繞組 經濟部智慧財產局員工消費合作社印製 22a 單位繞組部 2 6 捲線軸 2 8 第1分割心 2 9 第2分割心 3 8 李支線 4 0 心隙 本紙張尺度遶用中國國家標準（CNS)A4規格（210 X 297公釐） -20-* IIIII l · I f IIII line-Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs-17-Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 4 3 8 9 5 2 a7 _____B7__ 5. Description of the invention (15) Self-resonant frequency The voltage resonance energy will not easily leak to the primary side, and can prevent the conversion efficiency of the step-up transformer 5 from decreasing. In addition, the secondary winding 22 of the step-up transformer 5 is connected in series in a state of being divided into a plurality of unit winding portions 2 2 a. Therefore, the interlayer voltage of the entire secondary winding 22 will be reduced, and the electrostatic capacity will wait. If it is reduced, the resistance to high frequency will increase, and the Q 値 of self-resonance on the secondary winding 22 side can be reduced. And "The primary winding of the step-up transformer 5 is a strand of more than 8 branch wires of a limb line less than 0.1mm, so it can ensure the resistance component at the operating frequency and the resistance at the self-resonant frequency of the secondary winding." Therefore, the loss at the operating frequency is sufficiently small. Furthermore, the capacitor 1 is connected between the primary winding 19 of the step-up transformer 5 and the resonant capacitor 15 of the half-bridge-shaped switching portion 10. The series circuit formed by 7 and resistor 18 can suppress the high-frequency component of the operating frequency of the voltage waveform applied to the primary winding 19, and the vibration amplitude of the self-resonant frequency of the secondary winding 2 2 will be reduced, and The ringing component of the voltage waveform of the secondary winding 22 can be suppressed. Therefore, unnecessary high voltage will not occur, and the magnetron 7 can be started quickly. The present invention is not limited to the above embodiment, but can be as follows The ground is deformed or expanded. As the high-voltage rectifying section 11, a half-wave voltage rectifying circuit may be used. A series circuit composed of a capacitor 17 and a resistor 18 may be connected between the primary windings 19 of the step-up transformer 5. This paper ruler Applicable to China National Standard (CNS) A4 specification (21〇χ 297 mm) ----------- installation --- I l · I — I order · I I--I I--line — (Please read the precautions on the back side before filling out this page) -18- 4389 5 2 a? B7 V. Description of the invention (16) [Effects of the invention] < Please read the precautions on the back side before filling out this page As shown in the above description, in the microwave oven according to the present invention, the gap between the first divided core and the second divided core inserted into the core insertion hole of the step-up transformer is located on the secondary winding side, thereby reducing the secondary winding ’s self-reliance. The coupling coefficient moves the self-resonant frequency on the secondary winding side to the high-frequency side. Therefore, in a microwave oven using a half-bridge-shaped inverter power supply, although the use of an absolute green withstand voltage as the step-up transformer is small, Jiang Zhan can Excellent effect of preventing the magnetron from starting longer [Simplified description of the drawing] [Figure 1] A sectional view of a step-up transformer in an embodiment of the present invention. [Figure 2] With the door open Oblique view of the microwave oven shown. [Fig. 3] A circuit diagram showing the entire electrical structure in a simplified manner. [Fig. 4] Ministry of Economic Affairs The oblique view of the step-up transformer printed by the Intellectual Property Co., Ltd. Industrial Consumer Cooperative. [Fig. 5] An exploded oblique view of the step-up transformer. [Fig. 6] An oblique view showing the structure of the Lee branch line. [Fig. 7] The scale is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) -19- 4 3 3 9 5 2 A7 B7__ V. Description of the invention (17) The waveform diagram of the primary side voltage of the step-up transformer is shown. [第 8 Figure] (Please read the precautions on the reverse side before filling in this page) The waveform diagram of the secondary voltage corresponding to the primary voltage of the step-up transformer is displayed. [Figure 9] Number 8 displayed in different states of Q 値The figure is quite figure. [Illustration of drawing number] 5 Step-up transformer 7 Magnetron 10 Switching section (inverter power supply) 11 Rectifying section 14 Switching element 1 5 Resonant capacitor 19 Primary winding 2 0 High-voltage capacitor 2 2 Secondary winding Employee of Intellectual Property Bureau, Ministry of Economic Affairs Printed by a consumer cooperative 22a Unit winding section 2 6 Spool 2 8 1st split core 2 9 2nd split core 3 8 Li branch line 4 0 Aperture This paper uses Chinese National Standard (CNS) A4 specifications (210 X 297 male) Centimeters) -20-