Highly non-sinusoidal power distribution network currents are result of usage DC-link capacitors with high capacitance. This generates a lot of line current harmonics. The focus of this paper is on a simple and a cheap way to improve electrical energy conversion effectiveness. The main emphasis is on capacitance reduction in DC-link capacitors. Smaller relevant capacitance based on measurement with respect to conversion effectiveness. The circuit input stage employs a diode rectifier, to provide DC voltage on DC-link capacitors. Second stage are DC-link capacitors, which smooth the DC voltage. They provide energy for output converter which is H-bridge, controlled by control unit. Voltage measurements on DC-link capacitors is realized with modified peak detector circuit. Voltage divider for the voltage adjustment is also included.