STM32F100 Microcontroller Based ACS/Triac Control Demonstration Board

The STM-STEVAL-IHT005V2 demonstration board is designed for the home appliance market, with a focus on the demonstration of a robust solution with a 3.3 V supplied 32-bit MCU. Targeted applications are mid-end and high-end washing machines, dishwashers and dryers with different kinds of ACS®/Triacs. The demonstration board is based on the recently introduced 48-pin, 32-bit STM32F100C4T6B MCU running at 24 MHz (RC user-trimmable internal RC clock), featuring 16 kBytes of Flash memory, 12-bit A/D converter, 5 timers, communication interfaces, and 4 kBytes of SRAM. The power supply circuitry is based on the VIPer®16L, an offline converter with an 800 V avalanche rugged power section, operating at 60 kHz. The power supply provides negative 6 V in buck-boost topology. The STEVAL-IHT005V2 can control 2 high power loads up to 2830 W thanks to the T1635H, a 16 A, 600 V high temperature Triac and up to 2050 W thanks to the ACST1635-8FP a 16 A, 800 V high temperature overvoltage protected ACST device. The high power load control is based on phase angle control. In order to limit the inrush current and possible current peaks, the demonstration board features a soft-start routine and a smooth power change function for the high power loads. The STEVAL-IHT005V2 can also control 4 low power loads up to 100 W thanks to 3 ACS108-8S, 0.8 A, 800 V overvoltage protected ACS devices and a Z0109, 1 A standard 4 quadrant 600 V Triac. The demonstration board passed the precompliance tests for EMC directives IEC 61000-4-4 (burst up to 8 kV) and IEC 61000-4-5 (surge up to 2 kV). When put in standby mode, the STEVAL-IHT005V2 has an overall standby power consumption below 500 mW at 264 V/50 Hz. Complete solution for -3.3 V control Input voltage range: 90-265 VAC 50/60 Hz Negative 6 V/3.3 V VDC auxiliary power supply based on the VIPer16L in buck-boost topology Total power consumption in standby mode is lower than 0.5 W for 264 V/50 Hz 48-pin, 32-bit value line family STM32F100C4T6B MCU as main controller Zero voltage switching (ZVS) interrupt to synchronize MCU events with voltage mains 1x T1635H-6T and 1 x ACST1635-8FP for phase control of high power loads 5 discrete power level states with soft change for phase angle controlled devices 1x Z0109 and 3x ACS108 for full wave control of low power loads 1x relay for demonstration of the board noise robustness “Red” LED to show that the board is supplied from mains “Green” LED for each ACS/ACST/Triac to show that the device is turned ON JTAG programming connector External wire loop for gate current measurement I 2C bus hardware/software ready 18 test pins IEC 61000-4-4 precompliance test passed (burst up to 8 kV) IEC 61000-4-5 precompliance test passed (surge up to 2 kV) RoHS compliant