Overview
AC-DC rectification converts grid alternating current into regulated DC power, serving as the core of power electronics. It is widely deployed in telecom power, HVDC data centers, substation DC panels and new energy charging systems. Old phase-controlled rectifiers suffer from low power factor, high harmonic distortion and poor efficiency. Modern rectifiers adopt high-frequency switching, digital control and soft-switching topologies to meet strict grid and reliability requirements.
Core Technology of Modern Rectifiers
1.Active PFC Front Stage
Shapes input current to follow voltage phase, PF ≥0.99, effectively suppresses grid harmonic pollution and reduces THD.
2.LLC Resonant Soft-Switching Topology
Realizes ZVS/ZCS for power switches, cuts switching loss greatly, becomes the mainstream solution for medium & high-power rectifiers.
3.Digital Closed-Loop Control
DSP/FPGA-based voltage & current double-loop control, fast dynamic response, automatic current sharing for parallel modules, hot-swap support.
4.Wide-Bandgap SiC Devices
Higher switching frequency, lower conduction loss, higher power density, wide temperature range for harsh environments.
Key Performance Metrics for Rectifier Modules
- Conversion efficiency, power factor and total harmonic distortion (THD)
- Voltage/current regulation accuracy and dynamic response speed
- Parallel current sharing consistency
- Complete protection functions: input under/over voltage, phase loss, output overvoltage, overcurrent, short circuit, over-temperature
- MTBF, temperature adaptability and communication capability
Modular Design Advantages
- Redundant backup: single module failure will not shut down the whole system
- Flexible capacity expansion on demand
- Fault isolation and easy maintenance
- Suitable for critical loads such as power grid and IDC with high continuity requirements
Tonhe Rectifier Module Introduction
Tonhe TH series rectifier modules are independent domestic high-frequency rectification products.
- Product portfolio: 48V telecom power, 110V/220V substation DC screen, 240/336/750V HVDC and high-power charging rectifiers.
- Technical features: self-developed soft-switching control, built-in high-performance PFC, PF ≥0.99; SiC versions reach peak efficiency over 98%; voltage regulation accuracy ≤±0.5%.
- Environmental & reliability: double-sided potting, dustproof and moisture-proof, -40℃ cold start, adaptable to alpine and outdoor cabinet scenarios.
- Digital management: RS485 + Modbus communication, supporting four remote functions (remote measurement, remote signal, remote control, remote adjustment).
- Qualifications & application: with Telecom and State Grid certifications, widely used in domestic and overseas telecom, power and IDC projects, providing mature localized AC-DC conversion solutions.
