Please tell me the winding method and other parameters of the EE8 transformer that can increase 0.7V to 7V

electfans

Please tell me the winding method and other parameters of the EE8 transformer that can increase 0.7V to 7V [Copy link]

 

Could you please tell me the winding method and other parameters of the EE8 transformer that can be used to increase the voltage from 0.7V to 7V? The more detailed the better. Thank you!

maychang

Is it a copy board? If it is a copy board, disassemble the transformer, check the winding direction and count the number of turns to find out.

electfans

maychang posted on 2020-12-29 14:32 Is it a copy board? If it is a copy board, disassemble the transformer, check the winding direction and count the number of turns to find out.

Not a copycat

electfans

I need to boost 0.7V to 7V, use EE8 (EE12 or below) iron core, turn number 1:10, four pins (two in and two out), output power 3-5W, how thick should I use? How to wind it? How many turns? What should I pay attention to? How to calculate? Thank you!

maychang

electfans published on 2020-12-29 16:48 I need to boost 0.7V to 7V for a case. I use EE8 (EE12 or below) iron core, 1:10 turns, four pins (two in and two out), and output power...

"I need to boost 0.7V to 7V for a project. I need to use an EE8 (EE12 or below) iron core, 1:10 turns, four pins (two in and two out), and an output power of 3-5W. How thick should the core be? How to wind it? How many turns? What should I pay attention to? How to calculate?"

The circuit must be determined before the transformer can be designed.

electfans

maychang published on 2020-12-29 16:54 "I need to boost 0.7V to 7V for a case. I use an EE8 (EE12 or below) iron core with a turn ratio of 1:10 and four pins (two in and two out)...

The circuit is determined. After rectifier, 7V can be converted into about 5V DC to power the microcontroller. 3-5W is enough for the microcontroller circuit.

maychang

electfans published on 2020-12-29 20:44 The circuit is determined. After rectification, 7V can be converted into about 5V DC to power the microcontroller. 3-5W is enough for the microcontroller circuit

"The circuit is confirmed. After rectification, 7V can be converted into about 5V DC to power the microcontroller. 3-5W is enough for the microcontroller circuit."

Is this what is called "the circuit is determined"? We don't know what the circuit topology is (forward, flyback), whether it is self-oscillating...

In addition, the input voltage is only 0.7V, which is quite strange. Such a low voltage is just a PN junction voltage drop, and it is not easy to make the switching power supply work.

maychang

electfans published on 2020-12-29 20:44 The circuit is determined. After rectification, 7V can be converted into about 5V DC to power the microcontroller. 3-5W is enough for the microcontroller circuit

0.7V DC input, the output is a single-chip microcomputer system (the power is set at 5W for the time being). I guess you can only use single-ended flyback, and it can only be a self-excited circuit.

electfans

The 0.7V input is AC, the 7V output is also AC, and the 7V AC output, after rectification, gets about 5V DC to power the microcontroller.

maychang

electfans published on 2020-12-30 10:49 0.7V input is AC, 7V output is also AC, 7V AC output, after rectification, gets about 5V DC to power the microcontroller.

"The 0.7V input is AC, the 7V output is also AC, and the 7V AC output is rectified to get about 5V DC to power the microcontroller."

To determine the parameters of the transformer, you need to at least know the frequency of your AC.

electfans

maychang published on 2020-12-30 10:54 "0.7V input is AC, 7V output is also AC, 7V AC output, after rectification, gets about 5V DC to power the microcontroller." ...

50Hz

maychang

electfans published on 2020-12-30 16:38 50Hz

The power frequency is 50Hz, and the output power is 5W, which your EE8 core can never achieve.

electfans

50KHz EE8

maychang

electfans published on 2020-12-31 16:02 50KHz EE8

50kHz and 50Hz differ by a factor of 1000. This Electronic Transformer Design Handbook may be of some use to you.

电子变压器设计手册(1993).pdf (9.42 MB, downloads: 4)

2020-12-31 16:18 上传

点击文件名下载附件

electfans

maychang published on 2020-12-31 16:20 50kHz and 50Hz differ by 1000 times. This "Electronic Transformer Design Manual" may be of some use to you.

Thanks! 50K EE10 should be able to reach 3W

maychang

electfans posted on 2020-12-31 16:26 Thank you! 50K EE10 should be able to reach 30,000

[50K EE10 should be able to reach 3W]

If it's tightly wound, it might be possible.

maychang

electfans posted on 2020-12-31 16:26 Thank you! 50K EE10 should be able to reach 30,000

If you take apart a mobile phone charger, you will find that the size of the transformer inside should be similar to the 5W rectifier output transformer you require.

electfans

maychang posted on 2020-12-31 17:13 Take a look at a mobile phone charger. The size of the transformer inside should be about the same as the 5W rectifier output transformer you require.

I don't know how to wind it? How many turns should I wind? What thickness of wire should I use for the primary and secondary wires?

electfans

electfans posted on 2021-1-1 11:02 I don’t know how to wind it? How many turns should I wind? How thick should the primary and secondary wires be?

I downloaded a calculation tool from the Internet, but it is incomplete. It does not include the wire diameter, the transistor's magnification and inductance, etc. I don't quite understand it.

maychang

electfans posted on 2021-1-1 11:07 I downloaded a calculation tool online, but it is incomplete. It does not include the wire diameter, the transistor amplification factor and inductance, etc. I don’t quite understand it.

[What else do you need the transistor's amplification factor and inductance?]

I guess you downloaded the calculation tool for the self-excited converter transformer.