TWI332608B - Switching power converter with transformer arrangement - Google Patents
Switching power converter with transformer arrangement Download PDFInfo
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- TWI332608B TWI332608B TW95117237A TW95117237A TWI332608B TW I332608 B TWI332608 B TW I332608B TW 95117237 A TW95117237 A TW 95117237A TW 95117237 A TW95117237 A TW 95117237A TW I332608 B TWI332608 B TW I332608B
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1332608 九、發明說明 【發明戶斤屬之技術領域】1332608 IX. Description of the invention [Technical field of inventions]
月^日修正 本發明係有關於-種功轉脑,特別是指—種切換式功率轉換 【先前择術】 按’現今功率轉換器已被廣泛運用於提供調整電壓與電流 功率轉換器之研究焦點係灰在如何讓功率轉換器可更有 = 電源。切換式功率轉換器通常包含有一控制單元 '一開關與;愿 器,其中控制單元運用於感測切換式功率轉換器之輸出電愿及 以控制開關之切換與調整切換式功率轉換 器之输出電壓及/或輸出電流。 明參閱第-圖’其為f知切換式辨轉換器之電路圖。如圖 不’習知切換式功率轉換器包含有一變壓器1G,其包括有―― 繞組NP、-二次側繞組Ns與一辅助繞組Na,一次侧繞組队之一端 耦接-正供電執ViN ;—關u,其連接—次側繞㈣之另一端, 並且經由-電阻12連接至—諸餘,負供電執為 開關11,用於控制開關11以切_器10』 ,,式功率轉換器之輸出賴及/或輸出電流;二次側繞組H 二t f Γ13; 一渡波電容14 ’其兩端分別_在整流器13 /、一人m之另-端。當開關u導通時,能量將儲存至變壓器 釋一放旦二=截Γ ’變歷器10賴存之能量將經由二次側繞組 敝_,_軸_助雜 器The correction of the invention is related to the kind of work, especially the switching power conversion [previous selection] According to the 'current power converter has been widely used to provide the adjustment voltage and current power converter research The focus is on how to make the power converter more = power. The switching power converter usually includes a control unit, a switch and a switch, wherein the control unit is used to sense the output power of the switched power converter and to control the switching of the switch and adjust the output voltage of the switched power converter. And / or output current. Referring to Figure-FIG., it is a circuit diagram of the switching type identification converter. As shown in the figure, the conventional switching power converter includes a transformer 1G including - winding NP, - secondary winding Ns and an auxiliary winding Na, one end of the primary winding group is coupled - positive power supply ViN; - off u, connected - the other side of the secondary winding (four), and connected to - via the - resistor 12, the negative power supply is the switch 11, for controlling the switch 11 to cut the device 10, the type power converter The output depends on and/or the output current; the secondary winding H 2 tf Γ13; the first wave capacitor 14' has its two ends _ at the rectifier 13 /, the other end of one person m. When the switch u is turned on, the energy will be stored to the transformer. The release of the energy will be passed through the secondary winding 敝_,_axis_helper.
CC
Vo + VF = Nnsx όΦ dtVo + VF = Nnsx όΦ dt
Vaux = Ννα χVaux = Ννα χ
dOIT 依據方程式(1)及(2),反射電壓V舰可表示為如 Ννα … ' Vaux =-x (Vo + VF) Nns (1)(2) (3) 6 其中,ι錢分別補職組Na與二摘 轉換器之輪出電壓㈣流㈣之壓 降,φ為磁通董’ φ=¾^ π為曰+ 心截面積卜 為磁通㈣度,Ae為顏H 10之轴 控制早元25,其設置有_供應端働與—接地端. ,電源’· -f ’其输在―紐電路的 、= I,錢連接在髓㈣讀賴祕與 = 侧端vs產生-偵測„Vdet"其可表示為如下: 電歷dOIT According to equations (1) and (2), the reflected voltage V ship can be expressed as Ννα ... ' Vaux =-x (Vo + VF) Nns (1)(2) (3) 6 where, the money is replaced by the subgroup Na And the voltage drop of the two-pronged converter (four) flow (four), φ is the magnetic flux Dong ' φ = 3⁄4 ^ π is 曰 + the core cross-sectional area is the magnetic flux (four) degrees, Ae is the axis of the H 10 control early element 25, its setting has _ supply terminal — and - ground terminal., power supply '·-f ' is lost in the "New Circuit", = I, money is connected in the marrow (four) read Lai Mi and = side end vs generation - detection „ Vdet" can be expressed as follows:
Rl5 + Rl6 (4)Rl5 + Rl6 (4)
Vdeti = ^-5^—xVaux 其ρ與心分別為電阻15與電_<_ 經由:二極㈣對-供應電容17充電,以供應電源至控制單元^ 電阻12 ’其用於作為一電流感測裝置,電阻12連接在開 I與負供電執之間,以轉換變壓器1。之—切換電流L為一電流 。控制单元25之一電流感測端yi係連接電阻Μ,以用於偵 ==號Vcs ’控制單元25之一輸出端呢產生一切換訊號-以 器,雖然習用之切換式功率轉換器可以調整輸出電壓及 二一",,疋其具有幾個缺點。第—個缺點是變壓器Μ之漏電感 導致尚功率絲’此外由於漏電感讀存能量而形成高頓突波,如 =容易破壞開關U ’所以龍之切換式辨轉難為了保護開關n 係設有-猶f路,其包含有—緩衝二極㈣、—緩衝電容2〇與一 ,衝電阻21 ’用於雜賴n 1G之職感_存之能量,避免形成 尚電壓突波以保護開關11。 第二個缺點是切換式功率轉換器在輕負载與無負載之狀態下缺少 =整性。習用之切換式功率轉換器係藉由變壓器1G的辅助繞組NA供 ^電源至控制單元25,所以控鮮元25 U作電騎表_助繞組 =之負t勤料神職紅触貞她於_餘NA之負載 ,’變壓器10所儲存之能量將僅能經由二極體18與辅助繞組队釋 放至供應電容π,如此當關n截止時,整流器13將仍保持為關 1332608 閉狀態,所以切換式功率轉換器之輸出電壓Vq無法從輔^^^修正料广 授至控制單元25,所以在輕負載與無負载之狀態下,電~k 所產生之偵測電壓v^m僅與供應端VDD之電壓有關,所以習用之切 換式功率轉換器缺乏調整性。 另一習知技術係由楊先生等人所提出之美國專利第6, 853, 5阳 號的“一次側控制之返驰式功率轉換器(Primary—side⑺时印腕 flyback power converter)”,此習知技術之一主要缺點為電磁干擾 (Electric and Magnetic Interference,EMI),其產生之原因是開 關之汲極直接連接至正供電執,所以開關之一寄生電容與一寄生電感 相搞接’㈣形成-高頻共振槽’如此將會產生較高之電磁干擾。 因此,本發明提出-種切換式功率轉換器,其具有高效能' 以及低電針敎雛。耕,本發狀切赋功轉齡可於輕貞 ) 載與無負載之狀態下精確地調整輸出電麗。 【發明内尊】 本發明之主目的,在於提供—伽料裤轉魅其包含一 變廢器’變㈣設置有第——次織組與第二—次織組,第一一次 側繞組與第二-_触之間对_,如此可提物換式功率讎 器之效能與降低電磁干擾。 本發明之另一目的’在於提供-種切換式功率轉換器,其變壓器 之漏電感可祕應電容之電麟於麵器之二_繞_反射的電 j 燃’使得切換式功轉換器之輸出電壓可經由變屡器之第二一次側繞 組回授至控制電路,如此可增進切換式功率轉換器在輕負載與無負載 之狀態下的負载調整性。 本發明之又-目的,在於提供一種切換式功率轉換器,其變壓器 設有辅助敝谓絲餘進行充電,域提供第二電源至控制電 路’進而確餘制電路在有錯誤之情形下可正常運作。 本發明切換式功率轉換器,其包含有—類器,變壓器設置有一 8 第—次侧繞組以及一第二一次側繞組 與一負供電軌,一開關,其串聯於第--次側繞組與第二一次側繞組 之間,用於切換流經變壓器之第一一次繞組與第二一次繞組之一切換 電流,一電流感測裝置,其搞接開關與第二一次側繞組,用於依據變 壓器之一切換電流產生一電流訊號;_控制電路,其耦接開關與變壓 器之第二一次側繞組,以依據電流訊號產生一切換訊號,切換訊號用 於切換開關與調整切換式功率轉換器之輸出;一供應電容,其連接第 二一次側繞組控制電路之間,以供應電源至控制電路;一二極體,其 耦接負供電軌與供應電容以對供應電容充電。其中,上述之第二一次 側繞組具有一漏電感,其在開關導通時,儲存一儲存能量,且在開關 截止時’經由二極體釋放儲存能量至供應電容。如此藉由上述之變壓 器與開關的設置方式’可增進切換式功率轉換器之效能與降低電磁干 擾,且可增進切換式功率轉換器在輕負載與無負載之狀態下的負載調 整性。 茲為使貴審查委員對本發明之結構特徵及所達成之功效更有進 一步之瞭解與認識,謹佐以較佳之實施例圖及配合詳細之說明,說明 如後: 【實施方式】 請參閱第為本發明之—較佳實_之切換式功率轉換器 的電路圖。如騎示,本發明之娜式功轉換器包含有—變壓器 30 ’用於儲存能量並從魏⑽之―捕鄉儲存能量至變壓器 30之一二次側。.其中,髓器3〇之一次側設置有一第一一次側繞組 NP1與一第二一次側繞組Νκ,而變壓器3〇之二次侧則設置有一二次 侧繞組NS。第--次側繞組心與第二-次側繞組Np2 切換式功 率轉換器之供電執,即第一—次側繞組NP1之-第-端雛變壓器 30之正供電執vIN,而第二—摘敝知之—第-端職接變壓器 30之負供電執,亦即轉接至接地端。關35 倒繞組…二端與第二一次側祕之一第:=,二 卜月〒修正機頁 金或·.功0 M」' — ....... 切換流經變壓器30之第一一次側繞組Nn與第二一次側^組Npz之一-切換電流Ip,其中開關35可為一功率電晶體或為一功率金屬氧化半 導體場效電晶體(Metal Oxide Semiconductor Field EffectVdeti = ^-5^—xVaux whose ρ and heart are respectively the resistor 15 and the electric _<_ via: two-pole (four) pair-supply capacitor 17 to supply power to the control unit ^ resistor 12 ' is used as a current The sensing device, the resistor 12 is connected between the open I and the negative power supply to switch the transformer 1. The switching current L is a current. One of the current sensing terminals yi of the control unit 25 is connected to the resistor Μ for detecting the output of one of the control units 25 to generate a switching signal, although the conventional switching power converter can be adjusted. The output voltage and the two ", 疋, it has several shortcomings. The first disadvantage is that the leakage inductance of the transformer 导致 leads to the power of the wire. In addition, due to the leakage inductance, the energy is stored to form a high-voltage spur, such as = easy to damage the switch U ', so the switching mode of the dragon is difficult to protect the switch n There is - Juf road, which contains - buffer two poles (four), - snubber capacitors 2 〇 and one, the rush resistor 21 ' is used for the energy of the n 1G _ _ stored energy, to avoid the formation of voltage surges to protect the switch 11. The second drawback is that the switched power converter lacks = integrity under light load and no load conditions. The conventional switching power converter is powered by the auxiliary winding NA of the transformer 1G to the control unit 25, so the control element 25 U is used as the electric riding table _ assist winding = the negative t diligent priest red touch her _ For the load of the remaining NA, the energy stored in the transformer 10 will only be released to the supply capacitor π via the diode 18 and the auxiliary winding team, so that when the off n is turned off, the rectifier 13 will remain closed at the closed state of 1332608, so switching The output voltage Vq of the power converter cannot be widely distributed to the control unit 25 from the auxiliary correction material, so in the state of light load and no load, the detection voltage v^m generated by the electric ~k is only connected to the supply end. The voltage of VDD is related, so the conventional switching power converter lacks adjustability. Another conventional technique is the "primary-side (7) flyback power converter) of the U.S. Patent No. 6,853, 5, which is proposed by Mr. Yang et al. One of the main disadvantages of the prior art is Electro and Magnetic Interference (EMI), which is caused by the fact that the drain of the switch is directly connected to the positive power supply, so one of the parasitic capacitances of the switch is connected to a parasitic inductance' (4) Forming a high frequency resonant tank' will result in higher electromagnetic interference. Accordingly, the present invention proposes a switching power converter having high efficiency and low power pin. Tillage, the hair cut and the age of the hair can be adjusted in a light state. The output is accurately adjusted under the condition of no load and no load. [Inventive Internal Respect] The main purpose of the present invention is to provide a damper trousers that includes a variator "variation" (four) is provided with a first-second weave group and a second-second weave group, the first primary side winding Between the second and the second touch, the efficiency of the power exchange device can be improved and the electromagnetic interference can be reduced. Another object of the present invention is to provide a switching power converter, the leakage inductance of the transformer can be secreted by the electric capacitor of the capacitor, and the switching power converter is The output voltage can be fed back to the control circuit via the second primary winding of the repeater, which improves the load regulation of the switched power converter under light load and no load conditions. A further object of the present invention is to provide a switched power converter in which a transformer is provided with an auxiliary 敝 丝 进行 进行 进行 进行 进行 , , , , , 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域 域Operation. The switching power converter of the present invention comprises a class, the transformer is provided with an 8th primary-side winding and a second primary winding and a negative supply rail, and a switch is connected in series to the first-side winding And switching current between one of the first primary winding and the second primary winding flowing through the transformer, and a current sensing device, which engages the switch and the second primary winding , for converting a current according to one of the transformers to generate a current signal; the control circuit is coupled to the switch and the second primary winding of the transformer to generate a switching signal according to the current signal, and the switching signal is used for switching and adjusting switching The output of the power converter; a supply capacitor connected between the second primary winding control circuit to supply power to the control circuit; a diode coupled to the negative supply rail and the supply capacitor to charge the supply capacitor . Wherein, the second primary winding has a leakage inductance, which stores a stored energy when the switch is turned on, and releases stored energy to the supply capacitor via the diode when the switch is turned off. Thus, by the above-described arrangement of the transformer and the switch, the performance of the switching power converter can be improved and the electromagnetic interference can be reduced, and the load regulation of the switching power converter under the condition of light load and no load can be improved. For a better understanding and understanding of the structural features and the achievable effects of the present invention, please refer to the preferred embodiment and the detailed description, as follows: [Embodiment] Please refer to A circuit diagram of a switching power converter of the present invention. As shown in the ride, the Na-type power converter of the present invention includes a transformer 30' for storing energy and storing energy from Wei (10) to the secondary side of the transformer 30. Wherein, the primary side winding NP1 and the second primary side winding Νκ are disposed on the primary side of the medullary jaw 3, and the secondary side winding NS is disposed on the secondary side of the transformer 3 。. The power supply of the first-second winding core and the second-second winding Np2 switching power converter, that is, the first-second winding NP1-the first-end transformer 30 is powered by vIN, and the second- It is known that the first-end service transformer 30 is powered by a negative power supply, that is, it is transferred to the ground. Off 35 Inverted winding... One of the two ends and the second one side of the second: =, two months, the correction machine page gold or ·. Work 0 M"' - ....... Switch through the transformer 30 The first primary side winding Nn and the second primary side group Npz one-switching current Ip, wherein the switch 35 can be a power transistor or a power metal oxide semiconductor field effect transistor (Metal Oxide Semiconductor Field Effect)
Transistor,MOSFET)。由於開關35連接於第--次側繞組心與第 二一次側繞組Nre之間,因此可消除寄生裝置所引起之高頻共振槽, 進而降低電磁干擾。 一電流感測裝置,例如圖式之一電流感測電阻37,其兩端分別 連接開關35與第二一次側繞組Npa,以依據變壓器3〇之切換電流Ip 產生一電流訊號Vcs。為了調整切換式功率轉換器之一輸出電壓v〇, 一控制電路100耦接開關35與變壓器30之第二一次側繞組Np2,以 產生一切換訊號Vpw ’其用於切換開關35與調整切換式功率轉換器 之輸出電壓V。。一供應電谷70,其連接第二一次側繞組Nre與控制電 路100,以供應電源至控制電路100 ’供應電容7〇與變壓器3〇之負 供電軌之間設有一第一二極體60。 一緩衝電路45 ’其耦接於第 次側繞組Npi與正供電軌yIN之 間,緩衝電路45包含有一緩衝二極體40、一緩衝電容41與一緩衝 電阻42。緩衝二極體40之一端麵接第--次側繞組Nh與開關35,' Θ 緩衝電容41耦接於缓衝二極體40之另一端與正供電軌ViN之間,而 缓衝電阻42則與缓衝電容41並聯。一分壓電路50,其耦接於第二 一次側繞組Np2與負供電軌之間,分壓電路5〇包含有電阻52、55, 電阻52耦接於控制電路100與負供電軌之間,而電阻55則耦接於電 阻52與第二一次側繞組^之間。一整流器80,其一端耦接二次側 繞組Ns之厂端,而一濾波電容90之兩端係分別耦接於二次側繞組 Ns之另一端與整流器80之另一端。 請參閱第二圖,係為第一圖之切換式功率轉換器之等效電路圖。 如圖所示,第一一次側繞組NP1與第二一次側繞組Np2分別有漏電感 Ln、L〗2。由於變壓器之幾何構造因素,導致變壓器之一次側繞組的 儲存能量不能完全轉移至變壓器之其他繞組,漏電戚Lii、L即表 =儲,能讀法完全被轉移。當開關35導通時,切換大 30中’能量即錯存至變愿器3〇與漏電感l中,,而 κ當開關35截树,麵11 3G彳猶叙赫妓會職^次側繞組 s同時漏電感L,,、L,2所儲存之儲存能量會在迴路内循環傳遞, 若迴路被阻擋時,則會產生—電屋突波,其可表示為如 V = Lx· dt (5) 旦基於上述原因’缓衝電路45即運用於消耗漏電感L丨丨之儲存能 里’以避免產生-高電壓突波而保護開關35。緩衝電路奶之緩衝電 阻42所消耗之功率Pr可表示為如下: (6) PR=:R!r=lxL,xIp2^w 其中Re為緩衝電阻42之電阻值;I為緩衝電阻42之兩端電麼; L·為漏電之電感值;fs„為開關奶之切麵率。 由上述之方程式⑹可知,降低變壓器3〇之漏 升切換^力率轉換器之效能,_ 了符合安全餅,變壓 繞組總疋會產生-顯著的漏電感值,因此降低漏電感值之簡易方法即 減少繞組之、m電龜與敝之關係如下财程式所示: μΧ ~~~Π~~~χΝ2 ⑺ 其中m輪;a細導磁雜;u為鱗長度 數;Ae為變壓器30之軸心截面積。 〜、,且亟 树=變壓器30的一次側繞組切割為第一一次側繞組^鱼 第二爲係可以減少飯隨,如此即可降低第—側 ==感值’以提高切換式功率轉換器之效能。此外二 開關城峡,漏辦Li2之儲存能餘透 : 供應電容70 ’所以儲存㈣電感u 體=放至 100作為供應鶴,辦電容70難〇 讀供敍控制電路 v「心2應電合7G所產生之電壓^可表示為如下: [Ν^Χ^0 + νρ)] +Vu2 (8) 1332608 '.Ατ 你Ίο月泮修正皆换買 /、中’^與Nns分別為變壓器30之第二―次側繞組Γ|;Γ^ι^ 組Ns之繞組im為漏電感Li2所產生之賴,其如 所示而求得: 八 -XC70XVLI22 =-xLl2Xlp2 vu2=Mxip 其中,c'為供應電容70之電容值;L〖2為漏電感b2之電感值。Transistor, MOSFET). Since the switch 35 is connected between the first-stage winding core and the second primary winding Nre, the high-frequency resonance groove caused by the parasitic device can be eliminated, thereby reducing electromagnetic interference. A current sensing device, such as one of the current sensing resistors 37, is connected to the switch 35 and the second primary winding Npa at both ends to generate a current signal Vcs according to the switching current Ip of the transformer 3. In order to adjust the output voltage v〇 of one of the switching power converters, a control circuit 100 is coupled to the switch 35 and the second primary winding Np2 of the transformer 30 to generate a switching signal Vpw 'for switching the switch 35 and adjusting the switching The output voltage V of the power converter. . A supply valley 70 is connected to the second primary winding Nre and the control circuit 100 to supply a power supply to the control circuit 100. The supply capacitor 7 is provided with a first diode 60 between the negative supply rail of the transformer 3. . A buffer circuit 45' is coupled between the first side winding Npi and the positive supply rail yIN. The buffer circuit 45 includes a buffer diode 40, a buffer capacitor 41 and a buffer resistor 42. One end of the buffer diode 40 is connected to the first-side winding Nh and the switch 35, and the 缓冲 snubber capacitor 41 is coupled between the other end of the buffer diode 40 and the positive supply rail ViN, and the snubber resistor 42 Then connected in parallel with the snubber capacitor 41. A voltage dividing circuit 50 is coupled between the second primary winding Np2 and the negative power supply rail, and the voltage dividing circuit 5 〇 includes resistors 52 and 55. The resistor 52 is coupled to the control circuit 100 and the negative power supply rail. The resistor 55 is coupled between the resistor 52 and the second primary winding 2. A rectifier 80 is coupled to the factory end of the secondary winding Ns, and a filter capacitor 90 is coupled to the other end of the secondary winding Ns and the other end of the rectifier 80. Please refer to the second figure, which is the equivalent circuit diagram of the switched power converter of the first figure. As shown in the figure, the first primary side winding NP1 and the second primary side winding Np2 have leakage inductances Ln, L2, respectively. Due to the geometrical construction factor of the transformer, the stored energy of the primary winding of the transformer cannot be completely transferred to other windings of the transformer, and the leakage 戚Lii, L is the table = storage, and the reading method is completely transferred. When the switch 35 is turned on, the energy in the large 30 is switched to the changer 3 〇 and the leakage inductance l, and κ is the switch 35, and the face 11 3G 彳 叙 妓 妓 妓 ^ ^ ^ ^ s at the same time leakage inductance L,,, L, 2 stored stored energy will be cyclically transmitted in the loop, if the loop is blocked, it will generate - electric house surge, which can be expressed as V = Lx · dt (5 For the above reasons, the buffer circuit 45 is used to store the leakage inductance L丨丨 in the storage energy to avoid the generation of a high voltage surge to protect the switch 35. The power Pr consumed by the buffer circuit of the buffer circuit milk can be expressed as follows: (6) PR=: R!r=lxL, xIp2^w where Re is the resistance value of the buffer resistor 42; I is the both ends of the buffer resistor 42 L? is the inductance value of the leakage; fs„ is the cutting rate of the switch milk. It can be known from the above equation (6) that the efficiency of the converter of the transformer 3 is reduced, and the performance of the converter is changed. The total winding inductance will produce a significant leakage inductance value, so the simple way to reduce the leakage inductance value is to reduce the relationship between the winding, m electric turtle and 敝 as shown in the following program: μΧ ~~~Π~~~χΝ2 (7) m wheel; a fine magnetic impurity; u is the length of the scale; Ae is the axial cross-sectional area of the transformer 30. ~,, and eucalyptus = the primary winding of the transformer 30 is cut into the first primary winding ^ fish second For the department can reduce the rice, so you can reduce the first side == sense value to improve the performance of the switching power converter. In addition, the second switch city gorge, the storage of Li2 storage can be: the supply capacitor 70 ' so store (4) Inductance u body = put to 100 as a supply crane, it is difficult to read the supply control circuit v The voltage generated by the heart 2 should be 7G. It can be expressed as follows: [Ν^Χ^0 + νρ)] +Vu2 (8) 1332608 '.Ατ You Ί 泮 泮 泮 皆 皆 皆 / 、 、 、 、 、 、 、 They are respectively the second-secondary winding Γ| of the transformer 30; Γ^ι^ The winding im of the Ns is the leakage inductance Li2, which is obtained as shown: 八-XC70XVLI22 =-xLl2Xlp2 vu2=Mxip , c' is the capacitance value of the supply capacitor 70; L 〖2 is the inductance value of the leakage inductance b2.
因為漏電感L·2所產生之電壓Vl,2讓供應電容7〇之電壓Vdd高於 變壓器30之二次側繞組Ns所反射之電愿,因此開關35截止時,整 流器80將被開啟,所以切換式功率轉換器之輸出電壓¥。可經由第二 一次侧繞組Np2提供至控制電路1〇〇 ,如此恰當的使用第二一次側繞 組NP2之漏電感Lu,將可提高切換式功率轉換器在輕負载與無負載 之狀態下的負載調整性。 、Because the voltage V1,2 generated by the leakage inductance L·2 makes the voltage Vdd of the supply capacitor 7〇 higher than that of the secondary side winding Ns of the transformer 30, the rectifier 80 will be turned on when the switch 35 is turned off, so Switching power converter output voltage ¥. It can be supplied to the control circuit 1〇〇 via the second primary side winding Np2, so that the leakage inductance Lu of the second primary side winding NP2 can be properly used, which can improve the switching power converter under the condition of light load and no load. Load adjustability. ,
(9) (10) 請參閱第四圖,係為本發明之一較佳實施例之控制電路的電路 圖。如圖所示’本發明之控制電路100包含有一供應端VDD與一接地 端GND,並且並聯連接供應電容7〇以接收電源》供應端VDD更連接 第一一極體60 ’而接地端GND更連接第二一次側繞組Np2。一電壓偵 測端VS,其經由分壓電路50耦接第二一次側繞組Np2,以用於從變 壓器30之第一 一次側繞組Np2偵側一侦測電虔VDET2,偵測電麼可 表不為如下: VDET2 = X VnP2 (11) R52 R52 + R55 其中,Rn與分別為電阻52、55之電阻值;VNP2為第二一次侧繞 組NP2之電壓。 一電流感測端VI ’其耦接電流感測電阻37 ’用於接收電流訊號 Vcs。一輸出端VG,其耦接一正反器160之一輸出端,用於產生切換 訊號V™.以透過開關35切換變壓器30。一振盪器150,其產生一週 期性脈波訊號’用於啟動切換訊號Vp«。一比較器125,其用於關閉 切換訊號Vm ’比較器25之一負輸八端係連接電流感測端VI,用以 12 1332608 接收電流訊號Vcs ’而比較器125之一正輸入端則連名p=r蒸 120之一輸出端’用以接收一回授訊號vFB。 一旦電流訊號Vcs高於回授訊號Vfb時,切換訊號7卿將被截止。 比較器125,其一輸出端連接正反器160之一重置端,用以產生一重 置訊號Vrst,並傳送至正反器160之重置端,以截止切換訊號。誤差放 大器120,其用於產生回授訊號vFB ’誤差放大器12〇之一正輸入端 接收一參考電壓V8,誤差放大器120之一負輸入端則連接一取樣保 留電路110之一輸出端,以接收一取樣訊號Vs,用於產生回授訊號 Vfb。取樣保留電路110,其一輸入端耦接電壓偵測端vs,用以透過 分壓電路50從變壓器30偵測該偵測電壓VDm,以產生取樣訊號Vs。(9) (10) Please refer to the fourth figure, which is a circuit diagram of a control circuit in accordance with a preferred embodiment of the present invention. As shown in the figure, the control circuit 100 of the present invention includes a supply terminal VDD and a ground terminal GND, and a supply capacitor 7 is connected in parallel to receive power. The supply terminal VDD is further connected to the first body 60' and the ground terminal GND is further The second primary side winding Np2 is connected. A voltage detecting terminal VS is coupled to the second primary side winding Np2 via the voltage dividing circuit 50 for detecting a power VDET2 from the first primary winding Np2 of the transformer 30 to detect electricity. It can be expressed as follows: VDET2 = X VnP2 (11) R52 R52 + R55 where Rn is the resistance of resistors 52 and 55 respectively; VNP2 is the voltage of the second primary winding NP2. A current sensing terminal VI' is coupled to the current sensing resistor 37' for receiving the current signal Vcs. An output terminal VG is coupled to an output of a flip-flop 160 for generating a switching signal VTM to switch the transformer 30 through the switch 35. An oscillator 150, which generates a periodic pulse signal 'for activating the switching signal Vp«. a comparator 125 for turning off the switching signal Vm 'one of the negative input eight-terminal connection current sensing terminal VI of the comparator 25 for receiving the current signal Vcs ' at 12 1332608 and the positive input of one of the comparators 125 One of the p=r steam 120 outputs is used to receive a feedback signal vFB. Once the current signal Vcs is higher than the feedback signal Vfb, the switching signal 7 will be cut off. The comparator 125 has an output connected to a reset terminal of the flip-flop 160 for generating a reset signal Vrst and transmitted to the reset terminal of the flip-flop 160 to turn off the switching signal. The error amplifier 120 is configured to generate a feedback signal vFB. The positive input terminal receives a reference voltage V8, and one of the negative input terminals of the error amplifier 120 is coupled to an output of the sample retention circuit 110 for receiving. A sample signal Vs is used to generate the feedback signal Vfb. The sampling and holding circuit 110 has an input coupled to the voltage detecting terminal vs for detecting the detecting voltage VDm from the transformer 30 through the voltage dividing circuit 50 to generate the sampling signal Vs.
第二一次側繞組Np2之電壓Vnp2與二次側繞組Ns之電壓(V。+vF) 之間關係,可表示為如下: V〇+VF =The relationship between the voltage Vnp2 of the second primary winding Np2 and the voltage (V.+vF) of the secondary winding Ns can be expressed as follows: V〇+VF =
Nns NnP2 X VnP2 (12) 依據方程式(11)與(12),輸出電壓V。可表示為如下:Nns NnP2 X VnP2 (12) Output voltage V according to equations (11) and (12). Can be expressed as follows:
Vo R52 + R55 Nns R52Vo R52 + R55 Nns R52
NnP2 X VdET2) — Vf (13) 由方程式(13)可得知,切換式功率轉換器之輸出電壓VQ係可被調整。 % 請參閱第五圖,#為本發明之另一較佳實施例之切換式功率轉換 器之電路圖。如圖所示,本發明之變壓器39更包含一辅助繞組Na2, 變壓器39之輔助繞組ΝΛ2係連接第二一次側繞組Np2,且輔助繞級 心更經由一第二二極體65連接供應電容70。控制電路100之接地 端GND則連接第二一次侧繞組Np2與辅助繞組I,而供應端連 接供應電谷70、第一一極體60與第二二極體65。由於當開關35截 止時,第二一次側繞組NP2將供應電源至控制電路1〇〇,所以供應電 容70所產生之電壓Vdd係與切換式功率轉換器之輸出電壓v。有關, 若切換式功率轉換器在過電流及/或短路之情況下產生輸出電壓 V。,第二一次側繞組Np2之電壓V(ff2將會太低而無法供應足夠電源至 控制電路10(^因此本發明係增設輔助繞組Naz,當開關35導通時 13 _繞缒I將對供應電容70充電,所以輔助繞組^^二耳三 電源以供應電源至控制電路100,其係確保控制電路⑽可於 態下正常運作。 早狀 綜上所述’本發明之髓器設置方式可降低漏電感之電感值,此 電感觸存之赫能量可縣供輕源至鋪電路,如此可達到 及可增進切換式功轉換器於輕負載與無負載狀態下 故本發明實為一具有新穎性 合我國專利法專利申請要件無疑 局早日賜准專利,至感為禱。 、進步性及可供產業上利用者,應符 ’爰依法提出發明專利申請,祈韵 二、所述者’僅為本發明—較佳實施例而已 發明貫施.之範圍,故舉凡 尤非用來限疋本 特徵及精神所為之均等變化纽:申叫專細所述之形狀、構造、 範 W變化與修飾,均應包括於本發明 1332608NnP2 X VdET2) — Vf (13) From equation (13), the output voltage VQ of the switched power converter can be adjusted. % See the fifth figure, # is a circuit diagram of a switching power converter according to another preferred embodiment of the present invention. As shown in the figure, the transformer 39 of the present invention further includes an auxiliary winding Na2, the auxiliary winding ΝΛ2 of the transformer 39 is connected to the second primary side winding Np2, and the auxiliary winding core is further connected to the supply capacitor via a second diode 65. 70. The grounding terminal GND of the control circuit 100 connects the second primary side winding Np2 and the auxiliary winding I, and the supply terminal is connected to the supply electric valley 70, the first one body 60 and the second diode 65. Since the second primary winding NP2 supplies power to the control circuit 1 when the switch 35 is turned off, the voltage Vdd generated by the supply capacitor 70 is the output voltage v of the switching power converter. Relatedly, if the switching power converter generates an output voltage V under overcurrent and/or short circuit. The voltage V of the second primary winding Np2 (ff2 will be too low to supply sufficient power to the control circuit 10). Therefore, the present invention adds the auxiliary winding Naz. When the switch 35 is turned on, the 13 _ winding 将I will supply The capacitor 70 is charged, so the auxiliary winding is supplied with a power supply to the control circuit 100, which ensures that the control circuit (10) can operate normally. The early embodiment of the invention can reduce the setting of the marrow device. The inductance value of the leakage inductance, the energy of the inductor can be used for the light source to the circuit, so that the switching power converter can be improved and the load is not under load. Therefore, the invention is novel. In the case of China's patent law patent application requirements, it is undoubted that the Bureau will grant patents as soon as possible, and it will be prayed for the purpose. Progressive and available to the industry, it should be submitted in accordance with the law, and the applicants are only required to apply for invention patents according to law. The present invention, which is a preferred embodiment of the present invention, is not intended to limit the features and spirit of the present invention. The shape, structure, and variations and modifications of the present invention are described. Should be packaged 1,332,608 in the invention
【圖式簡單說明】 丨卜’个 第一圖係習知切換式功率轉換器的電路圖; 第二圖係本Μ之-触實酬之娜式解轉顧的電路圖; 第二圖係第二圖之切換式功率轉換n鱗效電路圖; 第四圖係本發明之_較佳實_之姉電路的電路圖;以及 第五圖係本發明之另-較佳實施例之切換式辨轉齡之電路圖。 第六圖係本發a月之模組化觸控面板之第三較佳實施例的剖視圖; 第七圖係本發日月之模組化觸控面板之第吨佳實施例的剖視圖; 第八圖係本發明之模組化觸控面板之第五較佳實施_剖視圖; =九圖係本發明之模組化觸控面板之第六較佳實施_上視圖,· =十圖係本發日月之模組化觸控面板之第六較佳實施綱剖視圖; 第十i係本發明之模組化觸控面板之第讀佳實施綱上棚丨以 第十二圖係本發明之模組化觸控面板之第 【主要元♦件符號說明】 10 變壓器 11 開關 !2 電阻 七較佳實施例的剖視圖。 % 13 整流器 14 濾波電容 15 電阻 16 電阻 17 供應電容 »· 18 二極體 19 緩衝二極體 2° 緩衝電容 21 緩衝電阻 控制單元 25 15 1332608[Simple diagram of the diagram] The first diagram is a circuit diagram of a conventional switching power converter; the second diagram is a circuit diagram of the ---------------- FIG. 4 is a circuit diagram of a circuit of the present invention; and a fifth diagram is a switch diagram of another preferred embodiment of the present invention. Circuit diagram. Figure 6 is a cross-sectional view showing a third preferred embodiment of the modular touch panel of the present month; the seventh drawing is a cross-sectional view of the first embodiment of the modular touch panel of the present invention; 8 is a fifth preferred embodiment of the modular touch panel of the present invention - a cross-sectional view; = 9 is a sixth preferred embodiment of the modular touch panel of the present invention - top view, · = ten maps A cross-sectional view of a sixth preferred embodiment of a modular touch panel of the present invention; a tenth embodiment of the first embodiment of the modular touch panel of the present invention; The first part of the grouped touch panel is described in the following section: 10 Transformer 11 Switch! 2 Resistor Seven is a cross-sectional view of a preferred embodiment. % 13 Rectifier 14 Filter Capacitor 15 Resistor 16 Resistor 17 Supply Capacitor »· 18 Diode 19 Buffer Diode 2° Capacitor 21 Buffer Resistor Control Unit 25 15 1332608
30 變壓器 35 開關 37 電流感測電阻 39 變壓器 40 緩衝二極體 41 緩衝電容 42 緩衝電阻 45 緩衝電路 50 分辱電路 52 電阻 55 電阻 60 第一二極體 65 第二二極體 70 供應電容 80 整流器 90 濾波電容 100 控制電路 110 取才義保留電路 120 誤差放大器 125 比較器 150 振盈器 160 正反器 GND 接地端 Ip 切換電流 Lii 漏電感 Ll2 漏電感 Να 辅助繞組 Na2 輔助繞組 ----、. 月1曰修正替換頁I , ______!_______ · 133260830 Transformer 35 Switch 37 Current Sensing Resistor 39 Transformer 40 Buffer Diode 41 Buffer Capacitor 42 Buffer Resistor 45 Buffer Circuit 50 Disgrace Circuit 52 Resistor 55 Resistor 60 First Diode 65 Second Dipole 70 Supply Capacitor 80 Rectifier 90 Filter Capacitor 100 Control Circuit 110 Take Retention Circuit 120 Error Amplifier 125 Comparator 150 Vibrator 160 Positive and Negative GND Ground Terminal Ip Switching Current Lii Leakage Inductance Ll2 Leakage Inductance Να Auxiliary Winding Na2 Auxiliary Winding -----,. Correction replacement page I, ______!_______ · 1332608
mm
Np 一次側繞組 Npi 第--次側繞組 Np2 第二一次側繞組 Vo 輸出電壓 Ns -二次側繞組- Vadx 反射電壓 Vfb 回授電壓 VnP2 電壓 Vcs 電流訊號 Vm 切換訊號 Vdeti 偵測電壓 VdET2 偵測電壓 VlN 正供電軌 VHP2 電壓 Vr 參考電壓 Vrst 重置訊號 Vs 取樣訊號 VDD 供應端 VG 輸出端 VI 電流感測端 VS 電壓偵測端 »月/1日修五替換頁 17Np primary side winding Npi first-side winding Np2 second primary winding Vo output voltage Ns - secondary winding - Vadx reflected voltage Vfb feedback voltage VnP2 voltage Vcs current signal Vm switching signal Vdeti detection voltage VdET2 detection Voltage VlN Positive supply rail VHP2 Voltage Vr Reference voltage Vrst Reset signal Vs Sample signal VDD Supply terminal VG Output terminal VI Current sensing terminal VS Voltage detection terminal » Month/1 day repair five replacement page 17
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TW95117237A TWI332608B (en) | 2006-05-16 | 2006-05-16 | Switching power converter with transformer arrangement |
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TW95117237A TWI332608B (en) | 2006-05-16 | 2006-05-16 | Switching power converter with transformer arrangement |
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TWI672897B (en) * | 2019-01-18 | 2019-09-21 | 宏碁股份有限公司 | Voltage converter |
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