Characteristic
The above transformers are widely used in switching power supply and have the following characteristics：
Use frequency：25-500kHZ
Power range：10-500W
High permeability, high efficiency, low leakage, good heat dissipation, small electromagnetic interference
Magnetic core：EE、EC、EI、EF、EER、ED、EFD、PQ、RM
Magnetic core material：SP3、SP4、SP4A
Installation: can be designed according to customer requirements
Applications
Various switching power supply: dc-dc, ac-dc-ac, dc-ac,UPS power supply, etc
Circuit form: forward excitation, back excitation, push pull, half bridge, full bridge circuit, etc
Used for power supply of communication, TV, air conditioner and computer. Switching power supply in all kinds of electronic equipment。
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EC28 vertical 10-pin transformer | EC35 horizontal 14-pin transformer |
Series specification sheet
model | A±2.0 | B±2.0 | D±2.0 | F±0.3 | G±0.5 | PIN |
EC25-1 | 25.0 | 22.0 | 20.0 | 5.0 | 12.5 | 4+4 |
EC28/28-1 | 29.0 | 30.0 | 23.0 | 5.0 | 17.5 | 5+5 |
EC28-28-2 | 30.0 | 24.5 | 30.0 | 5.0 | 25.0 | 6+6 |
EC28/34-1 | 30.0 | 36.0 | 24.0 | 5.0 | 17.5 | 5+5 |
EC28/34-2 | 30.0 | 27.0 | 39.0 | 5.0 | 30.0 | 6+6 |
EC35-1 | 40.0 | 46.5 | 30.5 | 5.0 | 25.0 | 8+8 |
EC35-2 | 36.5 | 29.5 | 41.5 | 5.0 | 34.0 | 7+7 |
EC39/40-1 | 40.5 | 45.0 | 29.5 | 5.0 | 25.0 | 7+7 |
EC40-1 | 40.5 | 48.0 | 31.0 | 5.0 | 25.0 | 8+8 |
EC40-2 | 40.0 | 27.5 | 44.0 | 5.0 | 35.0 | 8+8 |
EC42/15-1 | 45.0 | 48.0 | 31.0 | 5.0 | 25.0 | 9+9 |
EC40/20-1 | 45.0 | 48.0 | 37.5 | 5.0 | 32.0 | 9+9 |
EC42-1 | 44.0 | 35.0 | 45.0 | 5.0 | 35.0 | 8+8 |
EC49/42-1 | 50.5 | 47.5 | 37.5 | 5.0 | 28.0 | 9+9 |
EC49/52-1 | 52.0 | 59.5 | 38.5 | 5.0 | 28.0 | 9+9 |
ETD34-1 | 34.5 | 26.5 | 35.5 | 5.0 | 25.5 | 7+7 |
ETD34 Double-groove | 35.5 | 25.0 | 35.5 | 5.0 | 28.0 | 6+6 |
ETD44 Double-groove | 36.5 | 26.0 | 44.5 | 5.0 | 37.5 | 7+7 |
ETD49 Double-groove | 51.5 | 34.5 | 50.5 | 5.0 | 43.0 | 10+10 |
ETD49 | 55.0 | 42.5 | 57.0 | 5.0 | 40.5 | 10+10 |
（1）典型電路
在開關電源電路中，常用的典型電路拓撲有：正激式、反激式、推挽式、半橋式（全橋）等。典型的三路輸出正激變換器拓撲如下圖。在直流輸入電壓為60-200V，輸出功率為200W的場合，正激變換器可能是應用最廣泛的拓撲。
三端輸出正激變換器拓撲
反激變換器的典型電路圖如下圖，在5-150W的低成本電源應用中非常廣泛，其最大優點就是不需要次級輸出電感。
反激變換器拓撲
全橋變換器的典型拓撲如圖所示，其廣泛應用于輸入網壓為220V或更高應用場合，其主要優點是可以將變壓器初級側的漏感電壓尖峰鉗位于直流母線電壓，且將漏感能量回饋到輸入母線中。
全橋變換器拓撲
采用國際標準的質量體系認證、安全體系認證，讓客戶在使用中獲得更大的質量與安全保障
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UL安全認證（公司系統、原料） |
RoHS環保認定（產品、原料） |
