Low Cost Universal Motor Phase Angle Drive System

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Low-Cost Universal Motor Phase Angle Drive System
By Ivan Skalka
Roznov System Application Laboratory
Roznov pod Radhostem, Czech Republic
Introduction
This application note describes the design of a low-cost phase angle
motor control drive system based on Motorola’s
MC68HC05JJ6/MC68HC705JJ7 microcontroller (MCU) and the
MAC4DC snubberless triac. The low-cost single-phase power board is
dedicated for universal brushed motors operating from 1000 RPMs to
15,000 RPMs.
This application note also explains how to design the software
implementation using an MC68HC05 MCU. Such a low-cost MCU is
powerful enough to do the whole job necessary for driving a closed loop
phase angle system.
Today this universal motor is the most widely used motor in home
appliances such as vacuum cleaners, washers, hand tools, and food
processors.
The operational mode, which is used in this application, is closed loop
and regulated speed. This mode requires a speed sensor on the motor
shaft. Such a sensor is usually a tachometer generator. The kind of
motor and its drive have a high impact on many home appliance features
like cost, size, noise, and efficiency. Electronic control usually is
necessary when variable speed or energy savings are required.
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Application Note
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MCUs offer the advantages of low cost and attractive design. They can
operate with only a few external components and reduce the energy
consumption as well as cost. This circuit was designed as a simple
schematic using all features of a simple MCU. The MCU and this board
may be used in a wide variety of applications.
Figure 1. Low-Cost Motor Control Phase Angle Board
The phase angle control technique is used to adjust the voltage applied
to the motor (refer to Figure 2). A phase shift of the gate’s pulses allows
the effective voltage, seen by the motor, to be varied.
All required functions are performed by just two integrated circuits and a
small number of external components. This allows a compact printed
circuit board (PCB) design and a cost-effective solution.
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Application Note
Added Value Using a Microcontroller
LINE Voltage
VOLTAGE
Line
Motor
Voltage
MOTOR
VOLTAGE
LINE
VOLTAGE
Line
Voltage
tdt d
MOTOR
Motor
VOLTAGE
Voltage
GateSIGNAL
Signal
GATE
Freescale Semiconductor, Inc...
Gate SIGNAL
Signal
GATE
Figure 2. Phase Angle Control Technique
Added Value Using a Microcontroller
Compared to a poor analog solution, an MCU-based drive shows many
advantages. Some of them are:
•
Choice of different control algorithms
•
Choice of any shape of speed command (phase acceleration and
deceleration)
•
Choice of any type of tachometer
•
Software that can make the hardware simpler
•
Diagnostic functions
•
Remote control by wire and communication protocol
•
Open for innovation
Devices
Universal motors are still used where brushes are accepted, and
universal motors driven by triacs are used where a low price is required.
This section contains information and descriptions about all the features
of suitable MCUs and triacs.
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Application Note
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MC68HC05JJ6/
MC68HC705JJ7
The MC68HC05JJ6 is an M68HC05-based MCU designed for low-cost
applications. General features include:
•
6.1 Kbytes of ROM
•
224 bytes of RAM
•
16-bit timer including an output compare and an input capture
•
14 general-purpose input/output (I/O) pins
•
Simple serial input/output port (SIOP) in a 20-pin SOIC (small
outline integrated circuit) or a DIP (dual in-line) package.
In addition, the MC68HC05JJ6 has specific features including:
•
Two comparators which can be combined with the 16-bit
programmable timer to create a 4-channel single slope analog-todigital (A/D) converter.
•
High-current source/sink port and an on-chip temperature
measurement diode. The high-current source pins are important
for this application. The MC68HC05JJ6 has six pins with 10-mA
sink capability.
The MC68HC705JJ7 has the same features but replaces the ROM with
a 6.1-k one-time programmable EPROM and is more suitable for
program development.
MACx Triac Family
The series MAC4 and MAC8–MAC16 triacs are specially designed for
efficient motor drives. Triacs with low-enough trigger current for direct
drive by an MCU (MAC4DS, MAC8S, and MAC15S) usually have a low
dv/dt capability and may need to be snubbed.
The MAC15S is the largest sensitive-gate triac in the market today. High
dv/dt devices such as the MAC4DC, MAC9 and MAC16 are ideal for
snubberless applications. They can turn off inductive loads without a
snubber turn-off circuit, thereby saving the cost and space of extra
components. The MAC4DCN triac is designed for low-cost, industrial
and consumer applications such as temperature, light, and speed
control.
The main electrical parameters are found in Table 1.
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Application Note
Circuit
Table 1. Electrical Characteristics of the MAC4DCN
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Parameter
Value
Peak repetitive reverse voltage VRRM
800-V max
RMS current IT(RMS)
4-A max
Peak on-state voltage (ITM = 6 A peak) VTM
1.3-V typ
Continuous gate trigger current IGT MT2(–), G(–) IGT
25-mA typ
Critical rate of rise off-state voltage dv/dt
1700-V/µs typ
Circuit
In Figure 3, the schematic of a phase angle motor control board is
shown. As can be seen, the phase angle drive needs only two integrated
circuits: the MCU and one comparator.
The snubberless triac MAC4DC is used as the power device. This triac
has a high dv/dt immunity and, therefore, there is no RC circuit around
the triac. The MT1 pin of the triac is connected to VCC and the GATE pin
is connected directly to the microcontroller. The triac’s turn-on level on
pins PA3–PA5 is 0 V.
This configuration was chosen for two reasons. The first is the current
capability of the pins of port A. In the MC68HC705JJ7 General Release
Specification, Freescale document order number HC705JJ7GRS/D, it
can be found that the source capability is 5 mA and the sink capability is
10 mA. Our choice is the sink mode. The second reason is determined
by the triac. A common law states that snubberless triacs with high dv/dt
immunity need a higher gate trigger current IGT. The MAC4DC needs at
least 25 mA typically in case of negative IGT. For an operational mode
with positive IGT, the gate trigger current is much higher. Our choice is
to use a negative IGT. Three pins, PA3–PA5, are connected together and
are powerful enough to cover the amount of current needed by the gate
and to turn on the triac reliably.
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Application Note
The power supply includes only a few components (D1, D4, R7, C1, and
C2). The output voltage is +5 volts and despite its simplicity it is able to
supply the microcontroller, the comparator, the external control panel,
and also the triac.
This circuit is powered directly from the line. Do not touch any
parts of this board. When working with this board, do not connect
any computer, scope, or development system. In this case, it is
necessary to use an isolation transformer.
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WARNING:
Figure 3. Low-Cost Motor Control Phase Angle Drive
The circuitry connected to pin PB6 is needed for the acquisition of a
synchronization signal. This signal provides the most important
information to the microcontroller, which is the zero crossing of the line
voltage. The point of the zero crossing is fundamental for the calculation
of any triac’s action. All actions and the functionality concerning the triac
are controlled by software.
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Application Note
Circuit
Because this board provides the control algorithm in closed loop mode,
some devices allow connection of a tachometer. The most frequently
used tachometer has 16 poles and an output voltage of 5 volts to 20 volts
RMS for a full scale working speed. An input filter protects the
comparator against high voltage at high speed, and diode D3 protects
the comparator against negative voltage. The output square wave signal
from the comparator is connected to pin PB3. With this arrangement, the
input capture feature of the microcontroller can be used.
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The speed command can be set externally in the range of 0 volts to
3.5 volts. A simple external control panel (refer to Figure 4) should be
linked with the phase angle power stage when the external commands
are needed. The limits for the analog speed command (maximum
3.5 volts) are given by an internal A/D converter limitation. The
connectors MP1-Speed, MP2-Start/Stop, and MP3-GND are provided
on-board.
NOTE:
The control panel must be isolated from the user under all possible
circumstances.
VCC
4
R1
4 k7
SPEED
GND
START/STOP
1
0–3.5 VOLTS
R2
10 kΩ
SW1
START/STOP
3
2 STOP = OPEN, START = VCC
Figure 4. External Control Panel
The DIP switch, SW1, allows an option of the drive’s functionality and is
discussed later.
There are no pulldown or pullup resistors because these devices are
provided directly on the chip. The appropriate resistors are enabled in a
mask option register.
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Application Note
Synchronization
As is well known, the phase angle drive system needs to have
information about the line voltage and its zero crossing points. The
appropriate signal is connected to pin PB6. Only two resistors (R8 and
R9), one capacitor (C9), and a diode (D2) (as overvoltage protection) are
used. Due to its simplicity and its low-cost solution, the output signal is
not a real square wave.
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In Figure 4, the relationship between the line voltage and the
synchronization signal can be seen. The positive half period and the
negative half period are not identical. This situation causes a distortion
of the motor current. Under this condition, the phase angle drive works
but the triac is overloaded during one half period.
Figure 5 also shows the current of the motor including the software
adjustment. Fine correction can be done by software to avoid unequal
half periods of the current.
11.38011.380
ms
ms
8.620 ms
8.620 ms
INPUT LINE VOLTAGE
SYNCHRONIZATION
ON PIN PB6
MOTOR CURRENT
Figure 5. Synchronization Signal
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Application Note
Control Algorithm
Control Algorithm
The basic principle of the phase angle control algorithm is simple: match
the firing pulse time of the triac in relation with the zero crossing of the
line voltage. A phase shift of this firing pulse produces a variable output
voltage on the load. A structure with four interrupts has been chosen to
ensure proper functionality and some additional CPU performance
capacity.
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Figure 6 shows a state diagram. The software consists of a control block
and some subroutines like MAKE_ZERO, MAKE_PI, RAMPE,
watchdog, and interrupt services routines. The control block is, in fact, a
relatively short loop which makes a decision on which subroutines will be
called. There is also a universal timing routine which works with the
hardware (HW) timer and a unique register for every timed subroutine.
The timing routine calculates the difference between the HW timer and
a particular register and, in case of coincidence with the given number
(time interval), it calls the appropriate subroutines. The same principle is
used for all time conditions.
A DIP switch with three connected switches (refer to Figure 7) is
available on the board. Two of them are tested by the discussed
software (switches 2 and 3) and one is free for customer use (switch 4).
The control block tests the switch 2. This switch selects demo mode or
start/stop mode.
In demo mode, the drive starts automatically and runs in a 3-step
endless loop. In start/stop mode, both the external START command
and the analog external speed command are necessary.
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Application Note
RESET
INITIALIZATION
DONE
MOTOR STOP
DONE
END OF CONTROL BLOCK
RUN APPLICATION
UPDATED
DEMO SWITCH
OFF
DEMO SWITCH ON
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DEMO TABLE HANDLER
PUSH
TEST START BUTTON
PUSH-START
DEMO CYCLE
UPDATED
CONTROL BLOCK
TIME FOR
RAMPE
TIME
FOR PI
RTS
MAKE_ZERO
ZERO CROSSING
RTS
RAMPE
RTS
MAKE_PI
TIME FOR WATCHDOG
WATCHDOG
3 4
Figure 6. Program State Diagram
ON — 50 HZ
1
ON
2
ON — DEMO CYCLE
AVAILABLE
OFF — 60 Hz
OFF — START/STOP MODE
NOT CONNECTED
Figure 7. DIP Switch SW1
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Application Note
Control Algorithm
MAKE_ZERO
Subroutine
The MAKE_ZERO subroutine is entered when the zero crossing of the
line voltage occurs. The main job is to prepare the new value for the
output compare interrupt service routine. The calculation is based on the
half period of the line voltage. Since this time is different for 50 Hz
and 60 Hz, switch 3 distinguishes between these two cases. The input
value for the calculation is an output value from the PI controller. The
recalculation is done according to the position of switch 3 and the known
speed of the HW timer.
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The second task of the MAKE_ZERO subroutine is to start the A/D
converter. The A/D converter is needed for the start/stop mode when the
external analog speed command, connected to pin PB4, needs to be
converted. The A/D converter has several options, and it is based on the
two on-chip voltage comparators and a selectable charge/discharge
function. Voltages are resolved by measuring the time it takes an
external capacitor to charge up to the level of the measured unknown
input voltage.
The external capacitor can be calculated from this expression:
CEXT = (N x ICHG x P) / (VX x fOSC)
Where:
N = Number of counts during charge time 255
ICHG = Charge current 100 µA
P = Prescaler value 8
VX = Maximum input voltage 3.5 V
fOSC = Oscillator clock frequency 4 MHz
CEXT = (255 x 100x10-6 x 8) / (3.5 x 4x106) = 14 nF
From the several working modes available on the MC68HC705JJ7,
option mode 1 with manual charge control and automatic discharge was
chosen. The analog subsystem can generate interrupts. An analog
interrupt occurs when there is a match in the input conditions for the
voltage comparator. This analog interrupt is used to make achieving the
result easy.
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Application Note
MAKE_PI
Subroutine
The MAKE_PI subroutine is entered only when two conditions are
fulfilled: The time condition occurred, and the output compare occurred.
Because the MAKE_PI subroutine is a time-consuming part of the
software (700 µs), it is placed in the time window where no important
actions are expected (refer to Figure 10).
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The main job of the software is the calculation of the actual speed and
the calculation of the PI controller. The input value for the speed
calculation is a good, filtered, 16-bit output value from the input capture
interrupt. A 32/16-bit division is used where the 32-bit number is a
constant and the 16-bit number is the output from the input capture
interrupt.
The constant can be calculated from this expression:
CONST = N x INCAPMin
Where:
CONST = Constant for division
N = Maximal number of result 255
INCAPMin = Minimal number of counts between two edges of
tachometer signal (250 for 15,000 RPMs and 4-MHz crystal)
CONST = 255 x 250 = 63 750 (0000F906 hex)
For the PI controller, a well-known equation is used:
V = VZ_1 + P_CONST x (E - EZ_1) + I_CONST x E
Where:
V = Actual new value
VZ_1 = V in last step
P_CONST = Proportional constant
E = command_speed — actual_speed
EZ_1 = E in last step
I_CONST = Integration constant
The output from the PI controller provides the input value for the output
compare interrupt service subroutine.
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Application Note
Interrupts
RAMPE
Subroutine
The RAMPE subroutine is entered when a time event occurred. This
subroutine in fact changes the slope of the command speed’s signal.
The slope is the same for the rising and falling edges. The slope can be
modified through a change in the time interval for the RAMPE
subroutine.
Watchdog
Subroutine
The watchdog subroutine is entered when the watchdog register has not
been updated for approximately 4 seconds. The input capture interrupt
service routine, as a result of the running motor, takes the responsibility
for the watchdog register. By this arrangement, it is possible to protect
the motor when the shaft is blocked. In this case, the watchdog will turn
off the triac and will wait for a new START command.
Interrupts
As was mentioned in Control Algorithm, four interrupts are used (refer
to Figure 8). They are:
•
The simplest interrupt is the timer overflow interrupt. The
appropriate service routine is the timer overflow interrupt service
routine (TOISR), and it enables the input capture interrupt.
•
The input capture interrupt service routine (ICISR) is allowed to
run six times, and it calculates an average value of the time
interval between the rising edges of the tachometer signal.
•
The analog interrupt service routine (ANISR) reads and stores the
new value from the A/D converter.
•
The output compare interrupt service routine (OCISR) generates
the pulses for the triac (refer to Figure 9).
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Application Note
ENABLE 6X IC
RTI
ANALOG
INTERRUPT
A/D CONVERSION
RTI
TIMER OVERFLOW
INTERRUPT
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RUN APPLICATION
OUTPUT COMPARE
INTERRUPT
RTI
SENSE TACHO SIGNAL
INPUT CAPTURE
INTERRUPT
RTI
MAKE TRIAC PULSE
Figure 8. Interrupt Service Routines
Figure 9. Timing of SW Subroutines
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Application Note
Microcontroller Usage
Microcontroller Usage
Total RAM
and ROM Used
Table 2 shows how much memory was needed to run the phase angle
drive. A significant part of the memory is still available.
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Table 2. Memory Usage
I/O Use
Memory
Available
Used
SRAM
224 bytes
54 bytes
ROM
6.1 Kbytes
1.17 Kbytes
Table 3 summarizes the use of the I/O pins. Three pins are still available.
Table 3. I/O Pin Usages
I/O
Port A
Port B
Available Pins
Used Pins
Purpose
PA0–PA5
PA0–PA2
PA3–PA5
DIP switch
Triac
PB0–PB7
PB0
PB3
PB4
PB6
PB7
External capacitor
Tachometer
External speed
Synchronization
External START
Parts List and PCB
Component parts are listed in Table 4. Figure 10 and Figure 11 show
the printed circuit board (PCB) layout.
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Application Note
Table 4. Parts List
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Component
Quantity
Value/Rating
Description
U1
1
—
IC, MC68HC05JJ6P
or MC68HC705JJ7P
U2
1
—
IC, LM393N
Q1
1
4 A, 800 V
Triac, MAC4DCN-1
X1
1
4 MHz
Resonator
D1
1
1.0 A, 1000 V
Diode, 1N4007
D2
1
5.1 V, 1.0 W
Zener diode, 1N4733A
D3
1
1.0 A, 20 V
Schottky diode, 1N5817
D4
1
5.6 V, 1.0 W
Zener diode, 1N4734A
R6
1
150 Ω, 1/4 W
Resistor
R7
1
470 Ω, 1 W
Resistor
R8
1
220 kΩ, 1/4 W
Resistor
R9, R11, R12
3
47 kΩ, 1/4 W
Resistor
R15
1
3.3 kΩ, 1/4 W
Resistor
R16
1
2.2 kΩ, 1/4 W
Resistor
R17
1
4.7 kΩ, 1/4 W
Resistor
R18
1
470 Ω, 1/4 W
Resistor
R19
1
100 kΩ, 1/4 W
Resistor
10 kΩ, 1/4 W
Resistor
R20
C1
1
470 mF, 25 V
Capacitor electrolytic
C2
1
330 nF, 400 V
Capacitor
C4
1
15 nF, 50 V
Capacitor
C5, C6
2
18 pF, 50 V
Capacitor
C7, C8, C11
3
100 nF, 50 V
Capacitor
C9
1
1 nF, 50 V
Capacitor
C10
1
220 nF, 50 V
Capacitor
F1
1
4A
Fuse
J1–J6
6
—
Connector
SW1
1
—
DIP switch
MP1–MP3
3
—
Connector
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Application Note
Parts List and PCB
Figure 10. PCB Layout Component Side
Figure 11. PCB Layout Copper Side
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Application Note
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Performance
of the Sample
Design
The sample design performed with these measurements:
•
Input voltage — 220-volt RMS
•
Input current — 1 A-RMS without heatsink and without load
•
Motor — 400 W with tachometer
•
Demo mode — Automatic START; no speed reference needed
•
Start/Stop mode — START, external +5 volts, external speed
reference 0 volt to 3.5 volts
•
Speed — 1000 to 15,000 RPMs
Conclusion
This application note describes a real application, which can be used in
a low-cost product. The unused memory and some performance
capacity are still available for other customer purposes. These facts
make this application especially suitable for the appliance market.
References
The World Wide Web page for this application can be found on the
ON Semiconductor’s Web site.
Other references include:
•
MAC4DCM Data Sheet from ON Semiconductor
•
MC68HC05JJ6/JP6 General Release Specification, Freescale
document order number HC05JJ6GRS/D
•
Single-Slope Analog-to-Digital (A/D) Conversion, Freescale
document order number AN1708/D
•
MC68HC705JJ7 General Release Specification, Freescale
document order number HC705JJ7GRS/D
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Application Note
References
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N O N - D I S C L O S U R E
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A G R E E M E N T
R E Q U I R E D
Application Note
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