Bidirectional power control technology is integral to residential energy storage, portable energy storage, and electric vehicles. As energy efficiency becomes a growing priority, bidirectional power supplies must achieve higher effciency and reliability standards. High conversion efficiency is essential in the competitive digital power market, aligning with global energy conservation and emission reduction trends while promoting device miniaturization and integration.

Recent advancements in third-generation semiconductor materials, such as silicon carbide (SiC) and gallium nitride (GaN), have significantly enhanced digital power applications by pushing efficiency and miniaturization limits. However, their high cost compared to traditional silicon-based semiconductors has hindered widespread adoption.

AC/DC digital power circuits typically consist of a front-end power factor correction (PFC) stage and a back-end isolated DC/DC converter. These systems generally require two real-time microcontrollers, posing challenges such as:

- Limited real-time communication and data exchange between controllers.

- Increased system complexity, resulting in higher selection, procurement, upgrade, and maintenance costs.

To address the industry's demand for high efficiency, low cost, and bidirectional capability, Geehy has introduced the G32R501 Bidirectional Digital Power Supply Reference Design. This solution employs a single G32R501 real-time dual-core MCU to control a two-phase interleaved totem-pole PFC and LLC resonant converter. By utilizing traditional silicon MOSFETs, it achieves bidirectional soft-switching across both stages, offering an efficient and cost-effective solution for bidirectional digital power supplies.

Geehy G32R501 Bidirectional Digital Power Supply Solution Overview

The G32R501 solution delivers high efficiency, reliability, low noise, and cost-effectiveness, incorporating comprehensive input/output protection and soft-start functionality. It is ideal for communication power, server power, and portable energy storage applications.

The power supply consists of a two-stage power architecture:

- Front Stage: Two-phase interleaved totem-pole PFC circuit with 600V traditional silicon power MOSFETs.

- Back Stage: LLC resonant converter with a full-bridge primary structure. Losses are distributed using two transformers, with the secondary side comprising two sets of parallel full-wave synchronous rectifier circuits.

G32R501 Bidirectional Digital Power Supply Solution Block Diagram

G32R501 Bidirectional Digital Power Supply Solution Parameters

Key Advantages of the G32R501 Bidirectional Digital Power Supply Solution

· Single-Chip High-Performance Control: Operates at up to 250 MHz, managing both stages within a single core.

· Integrated Modular Design: Built-in PWM, COMP, and CAP modules. High-speed Hall sensors capture inductor current without external zero-cross detection, enabling flexible peak current control and soft switching across the PFC operating range while minimizing MOSFET body diode reverse recovery losses.

· High-Efficiency Energy Conversion: Soft-switching and bidirectional control for AC-DC and DC-DC conversion. Achieves peak efficiency >96.5% and operating efficiency >96%, meeting the 80Plus Titanium standard.

· Flexible Input/Output: Efficient single-phase AC to DC conversion, supporting constant power charge/discharge.

· Closed-Loop Interleaving Technology: 180° phase-shift control minimizes ripple and harmonics, improving light-load efficiency.

· Rapid Protection & Cooling: Fast response protection mechanisms with adjustable-speed fan cooling.

· Real-Time Monitoring & Adjustment: Supports host computer connectivity for real-time monitoring, parameter adjustments, and firmware updates.

G32R501 Bidirectional Digital Power Supply Solution Test Data

G32R501 Real-Time Control MCU

· High-Efficiency Computational Performance: Enhanced RAM can be flexibly configured as zero-wait ITCM and DTCM for faster access. The Arm® Cortex®-M52 core's ACI functionality allows direct integration of custom instructions, boosting computation speed and accelerating power application algorithms like filters, compensators, and phase-locked loops.

· Precise Peripheral Control: 16 PWM channels with 150ps high-resolution HRPWM output, ensuring precise duty cycle, switching frequency, phase shifting, and deadband control.

· Advanced Analog Peripherals: 7 comparators, each with 2 built-in 12-bit DACs, supporting blanking and filtering functions, which are essential for peak current control, zero-cross detection, and trip protection.

· Programmable Logic Blocks (PLB): Four PLBs for flexible logic and timing control.

· High-Speed ADCs: Three 12-bit ADCs (3.45 Msps) with 31 external channels for synchronized data acquisition.

· Wide Temperature Range: Operating from -40°C to 125°C, ensuring high electromagnetic resilience.

Key Features of the G32R501 Real-Time Control MCU

Designed for digital power applications, the Geehy G32R501 real-time control MCU integrates high-performance computing, precise control, and robust protection mechanisms. With extensive market experience and strong industry partnerships, Geehy continues to drive digital power innovation, achieving higher efficiency, power density, and cost-effectiveness while contributing to a greener, more sustainable energy future.