The core function of a pulse power rectifier is to convert AC into controllable pulsed DC with a specific frequency, duty cycle, and amplitude. Unlike traditional continuous smooth DC output, pulse rectifiers output periodically changing current waveforms, including square waves, pulse waves, or triangular waves.

1. Two-Stage Rectification and Pulse Modulation Architecture
   Modern pulse rectifiers typically employ a two-stage structure of "rectification + chopping":

Stage 1: Rectification and Filtering
Three-phase AC power is stepped down by a transformer and then converted to DC bus voltage via a six-pulse or twelve-pulse rectifier bridge. Multi-pulse rectification technology (such as 12-pulse, 24-pulse, or even 56-pulse) can effectively reduce input current harmonics, keeping total harmonic distortion (THD) below 3%, meeting stringent power quality standards such as IEEE 519.

Stage 2: Pulse Chopping Control
Through pulse width modulation (PWM) or pulse frequency modulation (PFM) technology, the high-speed switching of power switching devices is controlled. Key adjustable parameters include:
Pulse frequency: Continuously adjustable from DC to 40kHz
Duty cycle: Precisely set from 0 to 100%
Pulse amplitude: Continuously adjustable for both current and voltage
Positive and negative pulse switching: Supports bidirectional pulse output

2. Multi-pulse rectification and harmonic suppression
   For high-power applications, multi-pulse rectification technology (such as 12-pulse and 24-pulse) achieves a stepped approximation of the input current waveform to a sine wave through phase shifting of the transformer windings. The latest research proposes optimal pulse multiplication technology (PDT), which only requires the addition of two diodes and a tapped interphase reactor to upgrade a 28-pulse rectifier to a 56-pulse rectifier, achieving a measured THD as low as 2.8% under a 10kW load, without the need for an additional filter.

Pulse power rectifiers represent the development direction of electrochemical power source technology. They are not only simple power conversion devices, but also key equipment for improving process quality, reducing energy consumption, and realizing intelligent manufacturing. With the continuous advancements in power electronics technology, control theory, and materials science, pulse rectifiers will play an irreplaceable role in more high-precision, high-requirement industrial fields.

Liyuan Haina Rectifiers focuses on the R&D and manufacturing of industrial rectifier power supplies, providing a full range of pulse rectification solutions from laboratory-grade to industrial-grade. For more technical details or selection guidance, please contact our engineering team.

https://www.ly-rectifier.com/pro_cat/pulse-power-supply/