STEVAL-IHM006V1

STEVAL-IHM006V1 AC/AC chopper driver Data Brief Features ■ AC to AC chopper drive ■ Motor type: asynchronous with capacitor ■ Input: 230Vac @ 50/60Hz ■ Motor voltage: 230Vac ■ Motor current: 1.5A ) s ( ct u d o Description r P e The AC-Chopper is an application which has been developed for voltage regulation in an AC motor or AC load up to 300W. When connected to a motor or AC load, it allows the user to demonstrate smooth, silent, and efficient regulation with respect to triac solutions. STEVAL-IHM006V1 t e l ST Components o s b -O The main applications of this reference design are AC asynchronous mono-phase motors like refrigerators, hydraulic pumps, fans, lamps, etc. ) s ( ct u d o r P e t e l o ■ ST7FLITE05 : 8-bit MCU with single voltage flash memory, data EEPROM, ADC, timers, SPI ■ STGP7NC60H : N-channel 14A - 600V very fast PowerMESH™ IGBT ■ VIPer12ADIP: low power off line SMPS primary switches ■ L78L05A: positive voltage regulator ■ STTH108 : High voltage ultrafast rectifier ■ STTH3R06 : Turbo 2 ultrafast high voltage rectifier s b O July 2007 Rev 1 For further information contact your local STMicroelectronics sales office 1/5 www.st.com 5 STEVAL-IHM006V1 General circuit description 1 General circuit description Currently, the most widely used method to vary the AC mono-phase load voltage in applications such as refrigerators, hydraulic pumps, fans and lamps consists in using the phase partialization technique via a triac device. Although this simple and low cost solution has been used for several years, it creates excessive harmonic distortion and has a consequent low efficiency. Typical applications used to solve this problem are systems based on a complex inverter drive, which are quite expensive. The presented patented solution can solve third harmonic problems thanks to its switching work mode. The induction motor is driven in high frequency mode by an innovative switch topology, which delivers a silent and cost effective variable speed drive. The speed is controlled by the motor voltage: the power switch runs in PWM mode and its duty cycle changes linearly to control the speed versus the torque. ) s ( ct u d o The base circuit can be viewed as a double chopper that operates on a sinusoidal busdirectly from the 50-60Hz mains, without a preliminary AC-DC conversion type. r P e The double chopper is able to energize the load from any level of the sinusoidal voltagewave and demagnetize it via a free-wheeling current system, obtaining the voltage regulation and the current. This means that the circuit operates as an AC-AC converter or transformer and the form of the current load is a perfect sinusoidal shape. The proposed circuit does not have any load type limitations. It works with any inductive-ohmic load with notable angles between the current and the voltage. t e l o s b O The power can be controlled by varying the duty cycle of the PWM signal where the shape of the current is sinusoidal due to the filtering effect of the inductive nature of the load. ) (s If the load has a reactive power, it can transit between load and line grid independently from the power level and is not blocked or dissipated in any electronic parts of the circuit. t c u The control parameters (PWM modulation, reference signal and current sensing) are controlled through an MCU. The AC/AC chopper driver evaluation board is based on the ST7FLITE05 microcontroller (8-bit MCU with single voltage flash memory, ADC, timers, SPI, 1% internal RC oscillator) d o r P e t e l o s b O 2/5 1 100nF X2 J2 230 Vac PHASE C16 3 2 R6 +5 V +5 V +5 V AIN0 C25 100nF MOTOR PA1 PA0/LTIC 2 4 6 8 10 ST7LITE09 PA2/ATPWM0 RESET PA3 SS/AIN0/PB0 PA4 SCK/AIN1/PB1 PA5/ICCDATA MISO/AIN2/PB2 PA6/MCO/ICCCLK MOSI/AIN3/PB3 PA7 CLKIN/AIN4/PB4 Vdd Vss CON10A 1 3 5 7 9 JP1 8 7 6 5 4 3 2 1 U4 M R14 R1 220K 1/2W 1uF 250VAC C1 S1 C18 9 10 11 12 13 14 15 16 100pF R 1 J4 1 J3 PHASE 2 250V14L RV1 Q5 D1 RESET BC557 R12 10K STTH306 D5 250V10L RV2 STTH306 D6 Z1 STGP7NB60HD 1 STTH306 D2 R15 1.2k R8 470K D10 18V R4 0 +15 V C3 0.1uF-100V D16 1N4148 R9 2.2K Q2 BC547 270K R5 STTH306 5 2 4 1 T1 9 7 Q3 BC557 R13 R11 15 Q1 BC547 0 C12 0.1uF Vcontrol RS-196-375 Z2 D9 1N4148 STTH306 D4 D12 STTH108 t R7 NTC 2.2 U3 8 7 6 5 1 2 3 4 + D14 D13 15V 1uF-450V C13 r P e + STTH108 VIPer12ADIP D D D D S S FB VDD 10uF 25V C10 R3 470-1/4W STTH306 D8 STGP7NB60HD 1 PHASE C4 0.1uF-100V R2 5.6-1/4W C2 3.3nF puls e trans form er STTH306 D7 250V10L RV3 STTH306 D3 s b O t e l o J10 CON6_0 1 2 3 4 5 6 1 AC ASYNCHRONOUS 100nF X2 C17 RESET phase 0.1uF C8 22K T2 Line f ilter 4 1 F1 5A 2 3 MAINS 1 3 1 2 3 1 s b O t e l o 2 P e d o r t c u ) (s C14 10uF 25V 1mH L1 STTH108 D11 + R10 12K 1/4W C6 0.1uF +15 V 18V D15 3 +15 V C15 0.1uF IN U1 L78L05A/TO92 GND OUT C7 0.1uF 1 + +5 V C5 47uF-25V Figure 1. 2 2 J1 STEVAL-IHM006V1 Board schematic Board schematic Scheme ) s ( ct u d o 3/5 STEVAL-IHM006V1 Revision history 3 Revision history Table 1. Revision history Date Revision 20-Jul-2007 1 Changes Initial release. ) s ( ct u d o r P e t e l o ) (s t c u d o r P e t e l o s b O 4/5 s b O STEVAL-IHM006V1 ) s ( ct Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. u d o r P e All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. t e l o No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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