Dalian Unigroup Youshang Group launched a full-bridge phase-shifted DC-DC converter digital power solution based on ST products

On May 10, 2021, the leading semiconductor component distributor dedicated to the Asia-Pacific region---Lianda Holdings announced that its subsidiary Youshang has launched a 500W full-bridge phase-shift zero-voltage switching based on STMicroelectronics (ST) STM32G474 DC-DC converter digital power solution.

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Picture 1-The Demonstration Board Picture of the Digital Power Solution of Full-Bridge Phase-shift DC-DC Converter Based on ST Products Launched by Dalian Da Youshang (1)

Due to the increasingly stringent requirements of modern electronic products for work efficiency and volume, traditional linear power supplies are gradually being replaced by switching power supplies. By increasing the switching frequency, the switching power supply can effectively reduce the volume of the transformer and the inductor core, thereby improving the efficiency of the system and reducing the volume of the product at the same time. However, the power transistors of power supplies using general hard switching have to withstand greater switching spikes and switching losses. As the switching frequency increases, the overall efficiency of the circuit will also decrease.

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Picture 2-The Demonstration Board Picture of the Digital Power Solution of Full-bridge Phase-shift DC-DC Converter Based on ST Products Launched by Dalian Da Youshang (2)

In order to solve this problem, this solution uses flexible switching technology to achieve zero-voltage switching with a full-bridge phase-shift architecture, which can greatly reduce the efficiency loss of hard switching, suppress switching surges, reduce electromagnetic interference, and increase power transistors. performance. ST STM32G4 series products are based on the 170MHz Arm® Cortex®-M4 high-speed core, with a floating-point unit and support for DSP extended instruction sets. At the same time, it is equipped with ST's new hardware math accelerator to once again improve the computing performance of the chip.

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Figure 3-Block diagram of a digital power solution for full-bridge phase-shift DC-DC converters based on ST products launched by Dalian Dayoushang

The STM32G4 series completes the existing STM32F3 series, and its performance has reached 3 times that of the STM32F3 series, with a maximum operating temperature of 125°C. At the same time, this series of products have strong stability, especially the fast transient pulse (FTB) withstand capability up to 5.

Core technical advantages:

1. A high-resolution timer with 12 independent channels, each channel has a resolution of 184ps, and has self-compensation functions for temperature drift and voltage drift;
2. Up to 25 advanced analog peripherals:
Up to 5 12-bit analog-to-digital converters (ADC) with 4 million times per second, with hardware over-sampling function, which can achieve 16-bit resolution;
Up to 6 high-speed, high-gain bandwidth operational amplifiers, internal 1% gain setting;
Up to 7 15 million times/sec 12 digital-to-analog converters (DAC);
Up to 7 comparators, the propagation delay is 16.7ns.
3. CAN-FD industrial communication technology, the payload bit rate is 8 times that of standard CAN;
4. The operating mode power consumption is lower than 165μA/MHz, which extends battery life;
5. RAM with larger capacity, up to 128KB, with parity function;
6. Flash memory capacity is up to 512KB, with error checking function (ECC);
7. Increase the flexibility of DMA and external interrupts;
8. In order to optimize digital or analog functions, it is divided into three product series: basic series, enhanced series and high-resolution series.
Scheme specifications:

Input Voltage: 400V;
Output Voltage: 12V;
Output Power: 500W;
Maximum Output Current: 42A;
Switching Frequency: 100KHz.
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