STEVAL-IPFC12V1 Data brief 2 kW two-channel interleaved PFC reference design based on the STNRGPF12 digital controller with digital inrush current control Features Input voltage range: 90 to 265 V AC Line frequency range: 47 to 63 Hz Maximum output power: 2 kW at 230 V Digital Inrush Current Limiter function performed with SCR Output voltage: 400 V Power factor: > 0.98 at 20% load Total Harmonic Distortion: <5% at 20% load Mixed-signal Average Current Mode control, CCM fixed frequency operation Switching Frequency (f ): 60 kHz sw Cycle-by-cycle regulation (analog current control loop) Input voltage and load feed-forwards Phase shedding Current balance Burst-mode operation Overvoltage protection Overcurrent protection Thermal protection Status indicator LEDs Cooling function Product summary Description 2 kW two-channel The STEVAL-IPFC12V1 2 kW interleaved PFC reference design features the interleaved PFC based on the STEVAL-IPFC12V1 performance of analog cycle-by-cycle current regulation and the flexibility of digital STNRGPF12 digital control to generate sinusoidal supplies with very high power factor and very low controller harmonic distortion. two-channel Digital power control is based on the STNRGPF12 digital PFC controller, which in interleaved CCM combination with the TN3050H-12WY thyristor implements digital inrush current STNRGPF12 PFC digital limitation, and can drive up to two interleaved PFC channels using mixed signal controller (analog and digital) average current mode control in CCM at fixed frequency. automotive-grade TN3050H-12WY The 2 kW interleaved PFC reference design consists of a power board with 2-ch SCR Thyristor interleaved CCM boost power stage, input rectifier controlled bridge and auxiliary high voltage rectifier power supply, a control board with embedded STNRGPF12 digital controller and for bridge STBR3012 analog control circuitry, and a USB to UART (FTDI cable required - not included in applications the kit) bridge for programming the STNRGPF12 and performance monitoring. trench gate field- STGW20H65FB You can use the eDesignSuite software available on the ST website to configure the stop IGBT STNRGPF12 according to specific design requirements for each interleaved PFC. power Schottky STPSC12065D silicon carbide diode PFC Converter - Application Single Phase Input Digital PFC blog Articles article DB3882 - Rev 2 - August 2019 www.st.com For further information contact your local STMicroelectronics sales office.STEVAL-IPFC12V1 Design overview: 2 kW 2-ch interleaved PFC 1 Design overview: 2 kW 2-ch interleaved PFC The aim of this reference design is to provide a flexible PFC converter that can accept a wide input range (90 to 265 V at 50/60 Hz) for high power applications (600 W to 2 kW) that require supply power with very high PF and very low THD, in an efficient and cost effective package that can be easily configured for specific performance criteria. If we equate programmable digital control with flexibility, and analog logic with high performance, then the STNRGPF12 digital controller is the ideal choice, specifically designed for interleaved CCM boost PFC for applications above 600 watts. The controller supports mixed signal (analog/digital) architecture, with an analog loop providing cycle-by-cycle current control and the reference signals for PWM modulation, and a digital voltage loop managing all the non- time critical functions/protections, and calculating rapid feed forward responses to fluctuations in the input voltage or step changes in the load. Figure 1. STEVAL-IPFC12V1 block diagram 1. I/O measurement signals 2. Analog circuitry 3. Power stages 4. Digital control section 2-channel Mixed input AC EMI DC 3 3 3 3 Load Interleaved input output bridge filter PFC G2 G1 1 I tot fb Isolated PWM0 PWM1 3 Aux Analog Driver Driver 2 3 3 PS Current loop +5V +15V +5V ISO CLOCK SIN REF PWM 0 PWM 1 I 0 1 SCR TRIANG REF 3 isolated I 1 OUT PI 2 , 3 1 driving 4 STNRGPF12 SCR1 IOUT 1 SCR2 VOUT 1 1 VIN Regarding inrush current control, which is a critical protection feature also managed by the STNRGPF12 controller, we use a comprehensive approach involving firing angle control of high side TN3050H-12WY SCRs in a mixed input bridge the low side of the bridge consists of STBR3012 rectifier diodes. Both silicon devices are well above the required current rating to minimize voltage drops across the bridge, and offer low forward voltage drop and surge current/voltage handling. The PFC stage is based on a boost circuit design with two parallel channels to take advantage of the controller s ability to support interleaving through a secondary PWM channel that is phase-shifted 180 with respect to the master channel. While two channels increase circuit complexity, the interleaving operation ensures that there is less ripple and higher apparent switching frequency in the PFC input current, which allow the use of smaller and less expensive input EMI filters, boost inductors and switching devices. The STGW20H65FB IGBTs used for the boost switches are cost effective devices especially designed to minimize losses in power converters thanks to their low V and reduced tail current profile. CE(sat) DB3882 - Rev 2 page 2/9