Dalian Dayoushang Group launched a digital power solution based on ST products

style=”text-indent: 2em;”>On October 12, 2021, Dalian General Holdings, a leading semiconductor component distributor dedicated to the Asia-Pacific market, announced that its subsidiary Youshang launched STMicroelectronics (ST) STEVAL – Digital power solution for DPSTPFC1.

Figure 1 – The Display board of the digital power solution launched by Dalian Dayoushang based on ST products

The application of digital technology to power control is one of the most important changes in the power industry. In this era when energy saving and emission reduction have become the general trend, power supply applications are required to have higher efficiency and stricter specifications. Compared with traditional power supplies, it is difficult to meet certain specifications due to hardware limitations. Digital power supplies have more advantages. The digital power solution launched by Dalian University based on ST products can realize digital power factor correction (PFC) through the inrush current limiter (ICL Inrush Current Limiter).

Figure 2 – Block diagram of the digital power solution launched by Dalian Dayoushang based on ST products

STEVAL-DPSTPFC1 is a 3.6kW bridgeless totem pole boost circuit, which is equipped with a silicon carbide MOSFET (SCTW35N65G2V), a thyristor SCR (TN3050H-12WY), an isolated FET driver (STGAP2S) and a 32-bit MCU (STM32F334) to achieve The innovative topology design can be widely used in battery chargers, EV on-board charging, UPS and industrial chargers, SMPS in industry, and data center and telecom environments.

Figure 3-Scenario application diagram of the digital power solution launched by Dalian Dayou based on ST products

This solution supports compact converters operating at 72kHz with peak efficiencies as high as 97.5% and total harmonic distortion as low as 3.7%. In addition, the STEVAL-DPSTPFC1 features robust circuits up to 4kV EMC compliance with long switching life and low EMI emissions. This thyristor SCR acts as an AC line polarity switch, enabling active current limiting at power-up or line drop recovery. And the PFC efficiency is excellent, and there is no EMI bounce effect.

Core technical advantages:

ŸUse of low frequency silicon controlled rectifier SCR to control inrush current limit helps to eliminate the use of space-consuming thermistor/relay;

Ÿ Peak efficiency: 97.5%, total harmonic: distortion (THD) is 3.7%;

ŸCompact PFC converter;

Ÿ Higher switch life;

ŸComply with EMI specification at 4kV;

Ÿ Compliant with RoHS and WEEE.

Program Specifications:

Ÿ Input AC voltage: 85VAC to 264VAC;

Ÿ DC output voltage: 400VDC;

ŸMaximum input current: 16A;

Ÿ Switching frequency: 72kHz;

Ÿ Operation mode: CCM;

Ÿ230VAC, 50% load, peak efficiency ~97.5%;

ŸiTHD <10> 30% load;

Ÿ Digital inrush current limit control.