THINKANTECH Technology | 3-Phase 5kW Bridgeless Totem-Pole PFC Solution Powered by Renesas MCU
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December 16, 2025
THINKANTECH Technology | 3-Phase 5kW Bridgeless Totem-Pole PFC Solution Powered by Renesas MCU
Driven by Innovation, Empowering the Future
X-IPM Technology
1. Overview of Renesas Fully Digital Power Control MCU
The Renesas RA-T series MCUs are specifically optimized for motor control and digital power applications. These devices feature an optimal architecture that integrates Arm Cortex-M core, PWM timers, A/D converters, and Comparators.
They also offer rich communication interfaces, enabling scalable system control, along with high-speed memory and peripherals to support real-time applications with strong compatibility.
In addition, the built-in motor control accelerator unit enables faster current vector control, accelerated filtering operations, reduced CPU load, freeing resources for additional functionalities.
Renesas provides a comprehensive portfolio of motor control and digital power solutions, helping customers shorten development cycles and accelerate time-to-market.
The RA6T2 series is the product tailored for motor and inverter control applications. It combines Arm Cortex®-M33 core with dedicated motor control hardware accelerators and a high-speed flash memory enabling up to 240 MHz real-time performance.
It supports next-generation high-speed, high-response motor algorithms and enhances parallel processing capabilities for communication and control tasks.
The RA6T2 family includes:
20 device variants 5 package options Flexible Software Package (FSP) support Compatibility with the Arm ecosystem
This ensures efficient and precise control for motor and digital power systems.
2. Key Technical Advantages
1. High-Speed Data Processing
Main controller: Renesas RA6T2BD3C 240 MHz Arm Cortex-M33 core Integrated floating-point unit (FPU) Optimized for high-performance digital power control
2. High-Resolution PWM Drive
Up to 10-channel general-purpose PWM timers Supports complex three-phase sinusoidal control Enables higher switching frequency
3. High-Speed ADC Performance
Up to 29 analog input channels Dual independent ADC units Conversion speed exceeding 6 MSPS Reduces phase delay and improves system stability
4. Three-Phase Totem-Pole PFC Topology
3-phase AC input: 220V (phase voltage) DC bus voltage: ~700V Supports bidirectional AC-DC conversion Utilizes Space Vector PWM (SVPWM) technology
5. Advanced Grid Synchronization
ADC sampling detects positive/negative half-cycle transitions Software-based Phase-Locked Loop (PLL) synchronizes with grid voltage Ensures voltage and current are in phase to achieve high power factor Software zero-crossing detection monitors grid status
3. 5kW Three-Phase Totem-Pole PFC Prototype
(Prototype image shown)
4. Solution Specifications
AC-DC Rectification Mode
Input: 3-phase 220V (45–60 Hz) Output: 700V DC (rated) Power: 5kW Switching frequency: 80 kHz Power factor (PF): 0.99 THD: 5% Peak efficiency: 97%
Offline Inverter Mode
Input: 700V DC Output: 3-phase 380V AC (120° phase shift) Power: 5kW Switching frequency: 80 kHz Output frequency: 50 Hz THD: 5% Efficiency: ≥97%
5. Schematic
Detailed schematics are available in the file:
“Three-Phase 5kW Bridgeless PFC Schematic.pdf”
The file is publicly accessible. Please refer to the instructions at the end of this article for download.
6. Operating Principles
The system is designed with a target output voltage of 700V, with two primary control objectives:
Maintain a stable 700V DC output Ensure grid-side voltage and current are in phase
PLL-Based Angle Detection
A Phase-Locked Loop (PLL) is used to obtain the real-time phase angle of the three-phase voltage .
DQ Coordinate Transformation
The obtained phase angle is applied to transform three-phase voltage and current into the DQ reference frame, generating:
Vd, Vq Id, Iq
Voltage Control Loop
The system uses a feedforward decoupled PI control structure:
The difference between the reference (700V) and measured output voltage Processed through a PI controller Generates the current loop reference
Dual-Loop Control
Outer voltage loop + inner current loop Generates Ud and Uq Transformed into α-β components Applied to SVPWM for switching control
7. Application Scenarios
This solution is suitable for:
Active filters for industrial pumps and fans Bidirectional PCS systems for charging/swapping stations Three-phase UPS systems Supercapacitor charging topologies in charging stations
Download Resources
The following files are available for download:
Three-Phase 5kW Bridgeless PFC Schematic (PDF) Renesas MCU Control Code (ZIP)
Please visit the official website:
Nanjing THINKANTECH Technology Co., Ltd. (www.x-ipm.com)
and navigate to the relevant technical article.
