Power converter with signal frequency and amplitude regulation

Abstract

The paper considers the structure and methods of creating powerful power converters with adjustable output parameters. To change the rotational speed of the shaft of asynchronous engine (AM/E), the method of amplitude modulation is proposed. To modify the engine torque, a method is used to change the capacitance of the capacitor of the PC resonant oscillatory circuit. As a result, the circuit load voltage changes. The proposed solution based on the method of the amplitude modulation with the use of powerful transistor converters makes it possible to amplify a sufficiently weak harmonic input signal (not more than 1.5 W) to tens and hundreds of kilowatts. The use of a two-unit oscillating circuit with a series and parallel capacitors as a part of the power converter allows obtaining an undistorted sinusoidal voltage at the output with amplitude and frequency adjustment. The digital control of key elements of the converter allows formalizing the task of monitoring and diagnostics of the electric drive, including the remote one.