STEVAL-IHM006V1 STMicroelectronics, STEVAL-IHM006V1 Datasheet - Page 2

• Manufacturer Part Number: STEVAL-IHM006V1
• Description: EVAL BOARD AC/AC CHOPPER DRIVER
• Manufacturer: STMicroelectronics
• Type: Motor / Motion Controllers & Driversr

Specifications of STEVAL-IHM006V1

• Mfg Application Notes: STEVAL-IHM006V1 AppNote
• Design Resources: STEVAL-IHM006V1 Gerber Files STEVAL-IHM006V1 Schematic STEVAL-IHM006V1 Bill of Materials
• Main Purpose: Power Management, Motor Control
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ST7FLITE05
• Primary Attributes: AC Motors
• Secondary Attributes: AC-Chopper
• Input Voltage: 230 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: ST7FLITE05
• Other names: 497-5080

General circuit description
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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.
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.
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.
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.
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.
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)
STEVAL-IHM006V1