Ballasts, Inverters
1. Ballasts Overview
1）Definition and Function
A ballast is a power conversion device that provides stable current and voltage for discharge lamps (such as fluorescent lamps). It is mainly used to limit current, prevent lamp overload, and ensure voltage requirements at startup.
2）Electronic Ballasts
Technical Principle: Adopt high-frequency switching technology (such as power bipolar transistors or MOSFET) to convert industrial frequency power into high-frequency current (kilohertz level), significantly improving the luminous efficiency and energy efficiency of lamps.
Advantages: Compared with traditional inductive ballasts, it is smaller, has lower power consumption, and supports a dimming function, which is suitable for energy-saving lighting systems.
Application Scenarios: Widely used in commercial lighting, industrial lighting, and household energy-saving lamps.
3）Core Features
High-frequency operation reduces flicker and improves visual comfort;
Adapts to the negative impedance characteristics of fluorescent lamps to ensure stable operation.
2. Inverters Overview
1）Definition and Function
Inverters are electronic devices that convert direct current into alternating current, supporting output requirements of different voltages and frequencies, and are commonly used in power conversion, drive equipment, and new energy systems.
2）Resonant Inverters
Technical Principle: Use resonant circuits to achieve zero current or zero voltage switching (ZCS/ZVS), reduce switching losses, and improve efficiency. Typical types include Class-L and Class-M topologies.
Advantages: Suitable for high-voltage applications (such as high-voltage requirements when fluorescent lamps are started), and have strong adaptability to load changes.
3）Application Areas
Electronic Ballast: Combined with resonant inverters, it can achieve an efficient starting and stable power supply for fluorescent lamps;
New Energy Systems: Used in high-voltage power conversion scenarios such as solar inverters and electric vehicle charging devices.
3. Relevance and Development Trends
Synergy: Electronic ballasts often integrate inverter modules to optimize the overall performance of lighting systems through high frequency and resonance technology;
Technology Trends: Develop towards higher frequency and lower loss semiconductor devices (such as GaN, SiC) to promote intelligent and integrated design.