Adjustable DC power supplies are essential core equipment in many scenarios such as industrial power supply, laboratory testing, and new energy research and development. Most traditional adjustable DC power supplies adopt circuit structures based on silicon-based IGBTs. However, limited by physical material properties, such power supplies have long been plagued by high energy consumption, bulky size, and slow dynamic response. With the maturity of third-generation semiconductor technology, SiC and GaN wide bandgap devices are gradually replacing traditional IGBTs. They deliver tangible value for the performance upgrading, structural optimization and long-term operation and maintenance of adjustable DC power supplies, and also drive the power supply industry toward miniaturization, high efficiency and intelligent development.
1. Greatly Reduce Energy Consumption and Improve Conversion Efficiency of Adjustable DC Power Supplies
Traditional IGBTs are bipolar devices with obvious tail current and reverse recovery loss during operation. Their switching frequency is hard to exceed the conventional range, causing massive unnecessary power consumption of adjustable DC power supplies during voltage regulation and load switching. The energy loss problem becomes more prominent especially under working conditions with multi-speed voltage regulation and long-term low-load operation.
With unique material structures, SiC and GaN wide bandgap devices have no minority carrier storage effect, and their switching loss is only about one-fifth of that of IGBTs. When applied to adjustable DC power supplies, the energy conversion efficiency of power supplies is steadily improved, 3% to 6% higher than that of traditional IGBT schemes. For adjustable DC power supplies used in batches on industrial assembly lines and test power supplies operating around the clock in laboratories, the efficiency improvement can cut power costs in the long run and conform to the current industrial energy-saving and consumption-reduction trend. Enterprises like YIBENYUAN have also optimized the energy efficiency performance of adjustable DC power supplies by relying on wide bandgap devices in the research and development of new power products.
2. Increase Switching Frequency to Realize Miniaturization and Integration of Adjustable DC Power Supplies
The switching frequency directly determines the volume of passive components such as transformers, inductors and capacitors inside adjustable DC power supplies. Restricted by loss constraints, traditional IGBTs have a low switching frequency, resulting in large-sized supporting magnetic components and bulky overall equipment, which makes it difficult to adapt to the layout requirements of compact equipment.
SiC/GaN devices can easily achieve high-frequency operation at hundreds of kilohertz, far exceeding the upper operating limit of IGBTs. With high-frequency design, adjustable DC power supplies do not need to be equipped with large-scale filtering and voltage transformation components. The overall volume can be reduced by more than 40%, and the weight is also decreased synchronously. This allows adjustable DC power supplies to be flexibly embedded in precision instruments, portable test equipment and modular power supply systems, breaking the limitations of traditional power supplies such as large floor space and restricted installation, and adapting to more application scenarios in narrow spaces.
3. Optimize Dynamic Performance and Strengthen Voltage Regulation Capacity of Adjustable DC Power Supplies
In scenarios such as precision electronic testing and battery simulated power supply, adjustable DC power supplies need the capabilities of fast voltage stabilization, accurate voltage regulation and adaptation to sudden load changes. Traditional IGBTs have slow response speed, prone to voltage and current fluctuations and overshoot when facing instantaneous load changes, failing to meet the demands of high-precision testing.
Wide bandgap devices have higher carrier migration rate and more sensitive switching response. Adjustable DC power supplies equipped with such devices feature greatly improved response speed of voltage and current regulation. They can quickly lock output parameters during sudden load changes with significantly enhanced ripple suppression effect. Whether it is fine-tuning of small gear voltage or instantaneous switching of high-power loads, the output can remain stable, perfectly adapting to scenarios with strict requirements on power supply accuracy such as scientific research experiments, chip testing, and new energy module aging.
4. Withstand High Temperature Working Conditions and Extend Service Life of Adjustable DC Power Supplies
In scenarios such as industrial sites and outdoor cabinets, adjustable DC power supplies often operate continuously under high temperature and high load. Traditional IGBTs have low thermal conductivity. Under high temperature environments, loss surges and device aging accelerates, leading to increased overall failure rate of power supplies and frequent maintenance.
SiC and GaN materials possess far superior thermal conductivity and high temperature resistance than silicon-based IGBTs. They can operate stably under high temperature environments with slight performance attenuation. When applied to adjustable DC power supplies, the heat dissipation pressure of equipment is greatly reduced without building complex and large heat dissipation systems. Meanwhile, the aging resistance of devices is enhanced, and the overall continuous fault-free operation time of the power supply is significantly prolonged, reducing the cost and manpower investment of later maintenance and replacement.
Conclusion
From energy efficiency upgrading and volume reduction to precision optimization and service life extension, the replacement of IGBTs by SiC/GaN wide bandgap devices has achieved all-round performance gains for adjustable DC power supplies. With the continuous improvement of wide bandgap device technology and gradual cost reduction, it will be fully popularized in various industrial and laboratory-grade adjustable DC power supplies in the future. It will become the core driving force for the iterative upgrading of power electronic equipment, helping the power supply systems of various industries move to a new stage of higher efficiency, higher precision and more economy.
