Shenzhen Dowis Electronics Co.,Ltd
| Payment Terms | T/T, L/C |
| Delivery Time | 3-4Weeks |
| Packaging Details | Carton Box |
| Model | DW6990 |
| Series | EFD |
| Rated capacity | 30-3000kva |
| Rated voltage | 110V 220V |
| Frequency | 1KHz -500KHz |
| Output Voltage | 3v-24v |
| Brand Name | Dowis |
| Model Number | EFD20, EFD Series |
| Certification | CE, UL, RoHs, ISO9001, 16949 |
| Place of Origin | CN |
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Product Specification
| Payment Terms | T/T, L/C | Delivery Time | 3-4Weeks |
| Packaging Details | Carton Box | Model | DW6990 |
| Series | EFD | Rated capacity | 30-3000kva |
| Rated voltage | 110V 220V | Frequency | 1KHz -500KHz |
| Output Voltage | 3v-24v | Brand Name | Dowis |
| Model Number | EFD20, EFD Series | Certification | CE, UL, RoHs, ISO9001, 16949 |
| Place of Origin | CN | ||
| High Light | EFD20 220V To 15V Transformer ，220V To 15V Transformer 1KHz 500KHz ，Planar Power EFD Transformer | ||
EFD20 Planar Power Transformer Manufacturer Customized DW6990
A planar transformer is an instrument with high frequency, low shape, low height and high operating frequency. The biggest difference between planar transformers and conventional transformers is the core and coil windings. The planar transformer uses a small-sized E-type, RM-type or ring-type ferrite core, usually made of high-frequency power ferrite material, with low core loss at high frequencies; The circuit board is wound and formed, and the winding or the copper piece is stacked on the flat high-frequency iron core to form a magnetic circuit of the transformer. This design has low DC copper resistance, low leakage inductance and distributed capacitance to meet the design requirements of the resonant circuit. Moreover, due to the good magnetic shielding of the magnetic core, radio frequency interference can be suppressed.
1. Drawing (Unit: mm)
2. Schematic Diagram
3. Process of Winding
| No. | Winding | Terminals | Wire | Remarks | Number of turns | Insulation turns | |
| Start | End | ||||||
| 1 | Primary | 1 | 2 | 1UEWF ∮0.40mm*1 | Tightly wind a layer | 30 | 2 |
| 2 | Second | 6,7 | 9,10 | 1UEWF ∮0.45mm*4 | Tightly wind a layer | 5 | 2 |
| 3 | Bias | 4 | 5 | 1UEWF ∮0.40mm*1 | Tightly wind a layer | 17 | 3 |
4. Electrical Characteristics
| ITEMS | TERMINALS | SPECIFICATIONS | CONDITIONS | APPARATUS |
| Inductance | 1-2 | 120uH±10% | 100KHz,0.1Vrms | HP-4284A |
| Leakage Inductance | 1-2 | 3.0uH MAX (Shorted 4+5+6+7+9+10) | 100KHz,0.1Vrms | HP-4284A |
| Resistance | 1-2 | 150mΩ MAX | DC-25℃ | TH-2512 |
| 4-5 | 110mΩ MAX | |||
| 6,7-9,10 | 7.5mΩ MAX | |||
| Turns ratio | Pri:Sec | 1:0.167 | 20KHz,1Vrms | |
| Pri:Bias | 1:0.57 | |||
| Hi-Pot | Pri&bias to sec | AC 1500Vrms | 5mA,1minute |
Shenzhen Dowis Electronics Co., Ltd. is a professional manufacturer of electronic transformers, inductors, and filters integrating R&D, production, and sales. It is a national high-tech enterprise and has passed the IATF16949:2016 automotive industry quality management system certification, the product has passed the "UL""CQC" and other safety certifications. The products are widely used in communication equipment, new energy vehicles, industrial control equipment, high-power LED drives and other market areas. The industry has high visibility. In addition to the domestic market, but also exported to many countries in Europe and the United States.
In order to further expand production capacity, it has set up a special test area construction area in zhaoqing YueGui cooperation in 2018 of 14000 square meters of manufacturing center named ZhaoQing Sheng Xiang electronic technology co., Ltd. Its management technical team has rich experience in cooperating with customers from well-known domestic enterprises and overseas. The design of products can fully follow customer’s needs and services with a good quality control system, and it has been recognized by many famous enterprises as the core suppliers. We look forward to cooperating with you.
Company Details
Business Type:
Manufacturer,Exporter,Seller
Year Established:
2008
Total Annual:
13,000,000.00-14,800,000.00
Employee Number:
480~500
Ecer Certification：
Active Member
Shenzhen Dowis Electronics Co., Ltd. is a professional manufacturer of electronic transformers, inductors, and filters integrating R&D, production, and sales. It is a national high-tech enterprise and has passed the IATF16949:2016 automotive industry quality management system cert... Shenzhen Dowis Electronics Co., Ltd. is a professional manufacturer of electronic transformers, inductors, and filters integrating R&D, production, and sales. It is a national high-tech enterprise and has passed the IATF16949:2016 automotive industry quality management system cert...
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