Simple inverter circuit

dcexpert

Simple inverter circuit [Copy link]

From: https://www.hackster.io/dhritimanhb2015 ... uit-21e30b

This is a simple inverter circuit based on 13007 transistor, which is very suitable for small loads such as 15w LED bulbs, mobile chargers and other devices.

After supplying 12V to the circuit, one transistor is turned on at a time. Therefore, half of the transformer coil is turned on. Then, it reaches saturation and then the T2 transistor is turned on. The whole process is repeated continuously.

bigbat

The turns ratio of TR1 is small, what is the approximate inductance of the coil? Can you please tell me how to design a transformer?

dcexpert

bigbat posted on 2020-2-2 11:07 The turns ratio of TR1 is small, what is the approximate inductance of the coil? Can you please tell me how to design the transformer?

I am not familiar with transformer design. The one used in this project looks like a transformer from an old device.

bigbat

I don't understand how one transistor can be turned on and the other off in this circuit? Assuming that when the power is turned on, both T1 and T2 are forward biased, the circuit cannot be completely symmetrical. Assuming that T1 is turned on, and the T2 b pole on R1 is still forward biased, T2 will also be turned on. Although there is a transformer coil, the voltage cannot change suddenly, but it will not lock the other transistor, right?

dcexpert

bigbat posted on 2020-2-2 15:52 I don't understand how this circuit can have one transistor turned on and the other turned off? Assuming that when the power is turned on, both T1 and T2 are positively biased, the circuit cannot...

Assume that T1 is turned on first at the beginning, and current flows through T1. Because the current in the inductor cannot change suddenly, the current of T1 increases from low to large until saturation, and the voltage of T1-C increases from low to high. T2 is turned on, making T2-C low, T1 is turned off, and then the process is repeated.

qwqwqw2088

Transformer coil parameters are the key to the entire circuit

philips_lu

There may be a phenomenon of non-oscillation. Self-excitation circuits are increasingly disliked and the requirements for components are relatively strict.

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juanfeng2013

The link cannot be opened

dcexpert

juanfeng2013 posted on 2020-7-24 13:55 The link cannot be opened

It can be opened. It's your network problem.

chineseboyzxy

Any dual 12V transformer will work.