Universal motor driver with speed control
based on the STM8 and Triac (US version)
Features
■ Input voltage 120 V/60 Hz
■ Motor current: 7 A RMS
■ Phase control for universal motor drive
■ Open loop or closed loop speed regulation
■ Voltage and current sensing, for sensorless
operation (optional)
■ Debug outputs
■ AC tach, Hall sensor or opto-sensor for speed
feedback
■ RoHS compliant
STEVAL-IHM041V1
Databrief
Description
The STEVAL-IHM041V1 demonstration board is a
Triac-based phase angle control for universal
motor speed control using an STM8S103F3P6, 8bit microcontroller, to set the conduction angle of
the Triac.
The STEVAL-IHM041V1 demonstration board
may be operated in either open loop mode or in
closed loop speed control mode, with an AC tach,
Hall sensor or opto-sensor feedback.
The open loop mode may also be used as a lamp
dimmer.
The STEVAL-IHM041V1 demonstration board is
designed to operate from a 120 V/60 Hz mains,
but may be easily modified to operate on other
mains voltages by changing components in the
power supply and motor voltage sensing circuits.
Suggested component values for 230 V/50 Hz
mains voltages are shown in the relevant bill of
materials.
July 2012 Doc ID 023423 Rev 1 1/4
This is information on a product in full production.
www.st.com
4
Schematic diagram STEVAL-IHM041V1
AM12468v1
PB3
DNI
GND
PB2
DNI
PB1
PB1
PB2
PB3
1
2
J2
TX
115VAC
COMMUNICATIONS
out1gnd2gnd3NC
4
NC
5
gnd
6
gnd
7
in
8
U2
L7805ACD13
1
2
P2
R15
47
C4
470F 10V
GND
R16
0.01
10V
Z1
5V
Q1
T1635T
C1
0.22uF
gate
6
5
7
-
+
8
4
U1B
R13
1K
R11
22K
R7
100K
ZC
R17
5K
5V
C3
220uF 10V
MOTOR CONNECTION
POWER SUPPLY
R8
100K
R14
100K
R19
47K
1
2
3
4
J1
swim
C5
0.22uF
GND
5V
C6
0.22uF
LED5
DNI
pd41tx2rx3nrst4oscin5oscout6Vss7Vcap8Vdd9pa3
10
pb5
11
pb4
12
pc3
13
ain2
14
pc5
15
pc6
16
pc7
17
swim
18
ain3
19
ain4
20
U4
STM8S103F3P6
GND
5V
swim
TX
R18
2.2K
R25
2.2K
PB1
PB2
PB3
ZC
VFB
R26
2.2K
R20
100
R21
100
R22
2.2K
R23
2.2K
LED3
DNI
LED2 Red LED
LED4
DNI
LED1
DNI
gate
5V
5V
DEBUG
5V
CURRENT SENSIN G
6
5
7
-
+
8
4
U3B
MOTOR VOLTAGE SENSING
GND
5V
GND
2
3
1
-
+
8
4
U1A
R6
39K
R3 39K
R1 1K
R9 2K
GND
5V
VFB
R10 2K
5V
10R4DNI
R5
39K
R2 39K
2
3
1
-
+
8
4
U3A
LM393
R24
10K
5V
R30
10
VFB
C7
47nF
GND
1
2
3
4
J3
R32
10K
5V
R31
2K
R28
22K
5V
R33
10K
R29
2K
R27
200K
TACHOMETER INTERFACE
R12
MOV
1
TP1
1
TP2
D1
1N4148
D2
D3
C2
2.2uF 250V
1
2
P1
1
2
J4
1 Schematic diagram
Figure 1. Schematic diagram
2/4 Doc ID 023423 Rev 1
STEVAL-IHM041V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
06-Jul-2012 1 Initial release.
Doc ID 023423 Rev 1 3/4
STEVAL-IHM041V1
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4/4 Doc ID 023423 Rev 1
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