Related Experiment Videos
Low-cost programmable sine wave driver for inductive loads with built-in current sensing
Michal Labuda1, Veronika Wohlmuthova1, Ladislav Janousek1
1University of Zilina, Faculty of Electrical Engineering and Information Technology, Department of Electromagnetic and Biomedical Engineering, Univerzitna 8215/1, Zilina 010 26, Slovakia.
Hardwarex
|August 7, 2026
Summary
This study introduces a cost-effective device for generating amplified sine waves to power inductive loads. The system integrates a waveform generator, high-current amplifier, and current sensor for versatile applications.
Area of Science:
- Electrical Engineering
- Signal Processing
- Instrumentation
Background:
- Driving inductive loads requires specialized signal generation and amplification.
- Existing solutions may lack versatility or cost-effectiveness for certain applications.
- Accurate current monitoring is crucial for control and protection.
Purpose of the Study:
- To design and implement a compact, versatile device for generating and amplifying sinusoidal waveforms.
- To provide a flexible platform for driving inductive loads with high-power sine wave excitation.
- To integrate real-time current sensing for monitoring and protection.
Main Methods:
- Utilized the AD9833 direct digital synthesis (DDS) waveform generator.
- Employed the OPA548 high-current operational amplifier for signal amplification.
- Integrated the ACS724LLCTR-2P5AB-S Hall-effect current sensor for load current measurement.
Main Results:
- Successfully generated and amplified stable sine waves suitable for inductive loads.
- Demonstrated dual-mode operation: internal signal generation and external signal input.
- Verified accurate real-time load current measurement using the Hall-effect sensor.
Conclusions:
- The developed device offers a cost-effective and adaptable solution for inductive load excitation.
- The system is suitable for laboratory experimentation, education, and small-scale industrial testing.
- The integrated current sensing enhances system reliability and control.
Related Concept Videos
01:16Inductor in an AC Circuit
The basic components of an inductor are coils or loops of wire that are either wound around a hollow tube former or a ferromagnetic material (iron-cored) to increase their inductive value or inductance. When a voltage is applied across an inductor's terminals, a magnetic field is created, where the inductor stores its energy. The inductor's own self-induced or back emf value controls the growth of the current flowing through it. This back emf voltage is proportional to the rate of variation of...
01:11Inductors
An inductor is a passive component built to store energy within its magnetic field. It can be fabricated by coiling a wire around a magnetic core. When current is permitted to flow through this inductor, it is observed that the voltage across the inductor is directly proportional to the time rate of change of the current. Mathematically,
01:20Inductors
An inductor, also known as a choke, is a circuit component created to have a specific inductance. Inductors are among the crucial circuit components used in modern electronics, along with resistors and capacitors. They serve as a barrier against changes in a circuit's current. An inductor tends to suppress current changes in an alternating-current circuit that are faster than desired. In a direct-current circuit, an inductor aids in preserving a constant current despite changes in the applied...
01:22Full wave rectifier
A full-wave rectifier is a device that converts alternating current (AC) to direct current (DC) and is more efficient than its half-wave counterpart. It typically includes a center-tapped transformer, two diodes, and a load resistor. The secondary winding of the transformer is divided to provide two equal voltages of opposite polarities, which is the pivotal element of full-wave rectification.
01:21Generator Voltage Control
Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
01:20Half wave rectifier
A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.