STMicroelectronics STEVAL-IHM029V1 User manual
May 2010 Doc ID 17259 Rev 1 1/23
UM0922
User manual
STEVAL-IHM029V1:
2000 W universal motor control based on the STM8S103F2
Introduction
The STEVAL-IHM029V1 is a low-cost universal motor control demonstration board
designed for the home appliance market, with particular focus on vacuum cleaners, food
processors and power tools.
This system features the 20-pin, 8-bit STM8S103F2 microcontroller running at 16 MHz (RC
user-trimmable internal RC clock), featuring 4 KB of Flash memory, a 10-bit A/D converter,
8/16 bit timers, communication interfaces and 640 bytes E2PROM.
The power supply circuitry is based on the VIPer16LN, an off-line converter with an 800 V
avalanche-rugged power section, operating at 60 kHz.
The STEVAL-IHM029V1 can control any universal motor up to 2000 W, thanks to the
T1235H, a 12 A 600 V high temperature Triac. The motor control is based on phase-angle.
In order to limit the in-rush current and possible current peaks, the demonstration board
features a soft-start routine and a smooth power change function.
The board has passed the pre-compliance tests for EMC directives IEC 61000-4-4 (burst up
to 8 kV) and IEC 61000-4-5 (surge up to 2 kV).
In standby mode, the STEVAL-IHM029V1 has an overall standby power consumption below
300 mW.
Figure 1. STEVAL-IHM029V1
www.st.com
Contents UM0922
2/23 Doc ID 17259 Rev 1
Contents
1 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Target applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Schematic diagram and bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Oscilloscope waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 EMC test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
9 How to connect the STEVAL-IHM029V1 . . . . . . . . . . . . . . . . . . . . . . . . 15
10 How to operate the STEVAL-IHM029V1 . . . . . . . . . . . . . . . . . . . . . . . . . 16
11 Firing angle table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
12 The STEVAL-IHM029V1 layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
13 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
14 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
15 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
UM0922 List of figures
Doc ID 17259 Rev 1 3/23
List of figures
Figure 1. STEVAL-IHM029V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. STEVAL-IHM029V1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. STEVAL-IHM029V1 circuit schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4. Phase-angle control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5. Motor running at the lowest power level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 6. Motor working at the highest power level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 7. Zero-voltage switching (ZVS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 8. Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 9. Demonstration board overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 10. STEVAL-IHM029V1 silkscreen (top) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 11. STEVAL-IHM029V1 top layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 12. STEVAL-IHM029V1 bottom layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Safety instructions UM0922
4/23 Doc ID 17259 Rev 1
1 Safety instructions
Warning: The high voltage levels used to operate the STEVAL-
IHM029V1 could present a serious electrical shock hazard.
This demonstration board must be used in a suitable
laboratory environment only, by qualified personnel who are
familiar with the installation, use, and maintenance of power
electrical systems.
Intended use
The STEVAL-IHM029V1 is designed for demonstration purposes only, and must not be
used in domestic or industrial installations. The technical data, as well as the information
concerning the power supply and working conditions, must be taken from the
documentation included in the kit and strictly observed.
Installation
The installation of the STEVAL-IHM029V1 is described in this document.
The components must be protected against excessive strain. In particular, no components
should be bent, or isolating distances altered during the transportation, handling or use.
No contact must be made with electronic components and contacts.
The STEVAL-IHM029V1 contains electrostatically sensitive components, which may be
damaged if used improperly. To avoid risk of injury, ensure that electrical components are
not mechanically damaged.
Electrical connection
Applicable accident prevention rules must be followed when working from the mains power
supply. The electrical installation must be completed in accordance with the appropriate
requirements (e.g. cross-sectional areas of conductors, fusing and PE connections).
Board operation
A system architecture which supplies power to the demonstration board must be equipped
with additional control and protective devices, in accordance with the applicable safety
requirements (e.g. compliance of equipment and accident prevention rules).
Warning: Do not touch the board after disconnection from the mains,
as several parts and power terminals could contain an
electrical charge due to energized capacitors, which must be
allowed to discharge completely.
UM0922 Main features
Doc ID 17259 Rev 1 5/23
2 Main features
The main features of the STEVAL-IHM029V1 demonstration board are listed below.
●Input voltage range: 90-265 VAC, 50/60 Hz
●12 VDC / 5 VDC auxiliary power supply based on the VIPer16LN in buck converter
topology
●Total power consumption below 300 mW in standby mode
●Maximum output power: 2000 W
●20-pin, 8-bit STM8S103F2 MCU as main controller
●Employs zero-voltage switching (ZVS) to synchronize MCU events with the voltage
mains
●Motor driven by T1235H high-temperature Triac in phase-angle control
●5 power levels and standby mode selectable by potentiometer
●5 LEDs to display the power level of the board
●“RUN” LED to indicate the board is functioning
●Standard in-circuit programming connector
●IEC 61000-4-4 pre-compliance test passed (burst up to 8 kV)
●IEC 61000-4-5 pre-compliance test passed (surge up to 2 kV)
●RoHS compliant
Target applications UM0922
6/23 Doc ID 17259 Rev 1
3 Target applications
As a universal motor control demonstration, the STEVAL-IHM029V1 is mainly target at the
home appliance market for applications including:
●vacuum cleaners
●food processors
●power tools
UM0922 Block diagram
Doc ID 17259 Rev 1 7/23
4 Block diagram
The universal motor control system can be divided into a few simple blocks.
Figure 2. STEVAL-IHM029V1 block diagram
Power supply
The power supply is designed using a buck converter topology and is based on the
VIPer16LN, which works at a fixed frequency of 60 kHz. The wide range input voltage (90-
265 VAC, 50/60 Hz), allows the demonstration board to operate at either 110 VAC/60 Hz, or
220 VAC/50 Hz. The converter output voltage is -12 VDC. This voltage is sent to a L7905CP
linear regulator, which in turn provides a reference voltage of -5 VDC. The negative power
supply is highly recommended when driving a Triac directly with a microcontroller.
ZVS
The zero-voltage switching signal is captured directly from the input mains. The MCU
detects the ZVS after each period of the input mains, and synchronizes the routines and
events accordingly (i.e. the driving of the Triac).
User interface
The user interface consists of a potentiometer to adjust the output power level, and 6 LEDs
to indicate the status and the power level of the board.
Motor driving
The universal motor is driven by a high temperature Triac in phase-angle control.
STM8S103F2
The entire process is controlled by a 20-pin, 8-bit STM8S103F2 microcontroller.
Schematic diagram and bill of material UM0922
8/23 Doc ID 17259 Rev 1
5 Schematic diagram and bill of material
Figure 3. STEVAL-IHM029V1 circuit schematic
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UM0922 Schematic diagram and bill of material
Doc ID 17259 Rev 1 9/23
Table 1. BOM
Reference Part Supplier
C1 47 nF, 275 V, X2 EPCOS
C2, C3 4.7 µF, 400 V EPCOS
C6, C9 10 µF, 25 V
C4, C22 1 nF, 0805 SMD
R2, R3, C4 Not mounted
C7, C10 100 nF, 0805 SMD
C8 100 µF, 25 V
C11, C23 10 nF, 0805 SMD
C12 1 µF, 1208 SMD non-pol
DL1 10 mA, 3 mm, radial-green
DL2, DL3, DL4, DL5, DL6 10 mA, 3 mm, radial-red
D1, D2 1N4007
D3, D4, D5 STTH1R06 STMicroelectronics
D6 P6KE400CA Transil™ STMicroelectronics
J1, J2 CON 2-pin 5 mm
J3 Strip line 4-pin 2.54 mm
L1 1 mH radial Coilcraft
L2 470 µH radial Coilcraft
P1 50 kΩtrimmer
RV1 300 V 595+ varistor
R1 47 Ω2 W flame proof
R4 33 kΩ0805 SMD
R5 90 kΩ0805 SMD
R24, R25 220 kΩ0.6 W 5%
R26 75 Ω0.6 W 5%
R27, R28, R29, R30, R31, R32 820 Ω1208 SMD
TP1, TP2 Test point
TR1 T1235H-6I STMicroelectronics
U1 VIPER16LN STMicroelectronics
U2 L7905CP STMicroelectronics
U3 STM8S103F2P6 STMicroelectronics
Functional description UM0922
10/23 Doc ID 17259 Rev 1
6 Functional description
The driving of the motor is based on phase-angle control.
Figure 4. Phase-angle control
The MCU operation is synchronized with the voltage mains thanks to the zero-voltage
switching (ZVS) signal. This signal is sent directly to an MCU input pin, which is set as
external interrupt.
The Triac is turned on by sending a pulse to the Triac gate. The Triac turns off when the
voltage mains crosses 0 V.
The firing angle determines the power delivered to the motor; the lower the angle, the higher
the power.
Firing angle and gate pulse length are defined by software. At a mains frequency of 50 Hz,
the demonstration board has a firing angle ranging between 2.5 ms and 8.5 ms, and a
constant gate pulse length of 1 ms.
UM0922 Oscilloscope waveforms
Doc ID 17259 Rev 1 11/23
7 Oscilloscope waveforms
The following waveforms were taken while testing the demonstration board with a 300 W
universal motor and no load applied. The purpose of these waveforms is to show how MCU
signals are managed and synchronized to the voltage mains. These signals are valid and
remain unchanged for any universal motor connected to the demonstration board. The only
signal to change is the output current, which depends on the selected working level and
motor size.
Figure 5. Motor running at the lowest power level
The gate pulse (blue) is applied to the Triac with a firing angle of 8.5 ms with respect to the
voltage mains (brown). Once the pulse is applied, the Triac turns on and begins delivering
power to the motor. The purple waveform shows the current flowing through the motor. The
demonstration board is now working at level 1, delivering the minimum power to the motor.
Oscilloscope waveforms UM0922
12/23 Doc ID 17259 Rev 1
Figure 6. Motor working at the highest power level
The gate pulse (blue) is now applied to the Triac with a firing angle of 2.5 ms with respect to
the voltage mains (brown). Once the pulse is applied, the Triac turns on and begins
delivering power to the motor. At this point the purple waveform shows a higher current
flowing through the motor.
The demonstration board is now working at level 5, delivering the maximum power to the
motor.
Figure 7. Zero-voltage switching (ZVS)
The green waveform shows the zero-voltage switching signal (ZVS) applied to the MCU.
The signal is toggled every time the voltage mains crosses zero.
UM0922 Oscilloscope waveforms
Doc ID 17259 Rev 1 13/23
The ZVS signal is used by the MCU as a reference to calculate the firing angle and to
synchronize the Triac gate signal with the voltage mains.
The ZVS signal ranges from 0.6 V and 5.6 V. This is due to the cutting diodes inside the
MCU I/O port.
Figure 8. Soft-start
The waveform shows the output current behavior from start to the maximum output power.
The output current is slowly and smoothly increased until the working level is reached. In the
example, the working level is reached in about 4 seconds.
EMC test results UM0922
14/23 Doc ID 17259 Rev 1
8 EMC test results
The STEVAL-IHM029V1 demonstration board has successfully passed the pre-compliance
tests for EMC directives IEC 61000-4-4 (burst up to 8 kV) and IEC 61000-4-5 (surge up to 2
kV).
Table 2 lists the IEC-61000-4-4: Electrical fast transient/burst immunity test results.
●A: No changes in functionality. The board works properly, no reset occurs.
●B: Reset occurs, but the board recovers without external intervention.
●C: Reset occurs, but the board cannot recover without external intervention.
Test results for IEC-61000-4-5: Surge immunity are as follows:
Test passed at 2 kV (conditions: VIN 250 VAC, 50 Hz, both in standby and at working level
3).
Table 2. IEC-61000-4-4 test results
STEVAL-IHM029V1
VIN 250 VAC - 50Hz 2 kV 4 kV 6 kV 8 kV
Standby
+ L
Level 3 (5.5 ms)
A
A
A
A
A
A
B
B
Standby
+ N
Level 3 (5.5 ms)
A
A
A
A
A
A
B
B
Standby
+ L+N
Level 3 (5.5 ms)
A
A
A
A
A
B
B
B
Standby
- L
Level 3 (5.5 ms)
A
A
A
B
A
B
B
B
Standby
- N
Level 3 (5.5 ms)
A
A
B
B
B
B
B
B
Standby
- L+N
Level 3 (5.5 ms)
A
A
B
A
B
B
B
B
UM0922 How to connect the STEVAL-IHM029V1
Doc ID 17259 Rev 1 15/23
9 How to connect the STEVAL-IHM029V1
Figure 9. Demonstration board overview
Referring to Figure 9, on the left side of the board connect the mains voltage to the upper
connector, and the motor to the lower connector. The output power is controlled by the
potentiometer P1 on the right.
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How to operate the STEVAL-IHM029V1 UM0922
16/23 Doc ID 17259 Rev 1
10 How to operate the STEVAL-IHM029V1
The demonstration board can be tested with or without a load. Even if no motor is connected
to the demonstration board, all signals are visible by means of an oscilloscope.
While not required, it is recommended to turn potentiometer P1 to the OFF position before
powering the demonstration board. The STEVAL-IHM029V1 is ready to operate as soon as
it is plugged into the mains.
The output power level is adjusted by using potentiometer P1. Power regulation is broken
into 5 power levels: from 1 (minimum power), to 5 (maximum power). A green LED shows
the current power level.
Turning potentiometer P1 clockwise increments the output power, while turning the
potentiometer P1 counter-clockwise decreases the output power.
While the motor is running, the red LED marked RUN is on to indicate that the MCU is
properly driving the Triac.
Turning potentiometer P1 to the OFF position puts the STEVAL-IHM029V1 in standby mode
(total power consumption below 300 mW).
In the absence of the ZVS signal, the motor control is stopped, and the red LED starts
blinking. Once the ZVS signal is applied again, the motor control is restored.
UM0922 Firing angle table
Doc ID 17259 Rev 1 17/23
11 Firing angle table
The firing angles are set by software, and depend on the mains frequency:
Table 3. Firing angles
Working level 50 Hz mains frequency 60 Hz mains frequency
1 8.5 ms 7.0 ms
2 7.0 ms 6.0 ms
3 5.5 ms 5.0 ms
4 4.0 ms 3.5 ms
5 2.5 ms 2.0 ms
The STEVAL-IHM029V1 layout UM0922
18/23 Doc ID 17259 Rev 1
12 The STEVAL-IHM029V1 layout
The STEVAL-IHM029V1 is a standard, double-layer, coppered PCB with a copper thickness
of approximately 45 µm. The PCB material is FR-4.
●PCB dimensions:
– Length: 100 mm
– Width: 50 mm
– Thickness: 1.55 mm
Figure 10. STEVAL-IHM029V1 silkscreen (top)
Figure 11. STEVAL-IHM029V1 top layer
UM0922 The STEVAL-IHM029V1 layout
Doc ID 17259 Rev 1 19/23
Figure 12. STEVAL-IHM029V1 bottom layer
Ordering information UM0922
20/23 Doc ID 17259 Rev 1
13 Ordering information
The 2000 W universal motor control demonstration board is available through the standard
STMicroelectronics ordering system through order code STEVAL-IHM029V1. The kit
includes an assembled demonstration board and all related documentation.
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