Simple Inverter Circuit with just One Transistor for High Voltage Projects

One Transistor Inverter Circuit Diagram Overview

Flyback topology switch mode power supply DC to AC Inverter Circuit electrobuff.blogspot.com

Hi, today I'll show you a simple inverter idea with just one transistor. It's quite good for the component count, and can even be used as a general purpose Flyback transformer driver for a high voltage power supply or Arc lighter.
Output voltage is determined by the primary to secondary turns ratio and the duty cyle (ratio of the period in which the transistor is conducting)
A flyback Switched-Mode Power Supply (SMPS) is a type of power supply topology commonly used for low-to-medium power applications. It is characterized by its simplicity, compact size, and efficiency. The flyback SMPS operates by storing energy in the magnetic field of a transformer during one part of the switching cycle and releasing it during another. Here's a step-by-step explanation of how a flyback SMPS works:
Input Voltage to the Transformer:
The DC voltage is then fed into the primary winding of the transformer. The transformer in a flyback SMPS is typically designed to store energy during a specific portion of the switching cycle.

Switching Transistor (Chopper):

A switching transistor (often a MOSFET) is connected in series with the primary winding of the transformer. This transistor rapidly switches on and off, creating a square wave or a pulse waveform.

Energy Storage in the Transformer:

When the switching transistor is in the ON state, current flows through the primary winding of the transformer, creating a magnetic field. Energy is stored in this magnetic field.

Magnetic Field Collapse:

When the switching transistor turns off, the magnetic field in the transformer collapses. This collapse induces a voltage in the secondary winding of the transformer.

Isolation and Voltage Regulation:

The transformer provides electrical isolation between the input and output. The turns ratio between the primary and secondary windings determines the output voltage. Additional components, such as diodes and capacitors, are used to rectify and filter the induced voltage to create a stable DC output.

Feedback Control:

A feedback control system is often employed to regulate the output voltage. This system monitors the output voltage and adjusts the duty cycle of the switching transistor to maintain a constant output.

Output to Load:

The regulated output voltage is then delivered to the load (electronic devices, circuits, etc.).

Cycle Repeats:

The entire process repeats cyclically at a high frequency, typically in the range of tens of kilohertz to a few hundred kilohertz, depending on the design and application requirements.

Advantages of Flyback SMPS: