1kw Sine Wave Inverter Circuit Diagram PDF
1kw Sine Wave Inverter Circuit Diagram PDF
1kw Sine Wave Inverter Circuit Diagram PDF
ML4423*
1, 2, or 3-Phase Variable Speed AC Motor Controller
GENERAL DESCRIPTION FEATURES
The ML4423 provides the PWM sinewave drive signals Drives single, two, and three phase AC motors
necessary for controlling three phase AC induction motors as
well as single and two phase split capacitor AC induction Greater than 10:1 variable speed control range
motors.
Constant V/F ratio with programmable end points
A constant voltage/frequency ratio can be maintained
over a frequency range of greater than 10:1, providing Reverse capability for two and three phase motors
15Hz to 150Hz control. The output variable frequency AC
voltages are sensed and fed back to the controller to track the Low distortion PWM sinewave drive
sinewave frequency and amplitude set at the speed control
input. Direction, on two and three phase motors, is controlled Eliminates run capacitors in PSC motors
by changing the relative phase difference between the motor
windings: 90 for two phase motors and 120 and 240 for three Coast function for quick power disable
phase motors.
Low cost interface for various gate drivers
To protect the motor, power devices, high voltage drivers
and control circuitry, the ML4423 includes fixed period, PWM current limit, undervoltage lockout, and
pulse by pulse variable duty cycle current limit, deadtime programmable deadtime
circuitry, and undervoltage lockout. The ML4423 has
selectable output voltage swing of 5V or 12V for 12V 20% operation with onboard 8V reference
interfacing to different high side drivers and power devices.
BLOCK DIAGRAM
27 28 13 15 18
SINE A-C SINE B-C CT F/R 3PH/2PH
FB A COAST
1 + 14
PWM
+
OSCILLATOR
RDT
FB C
9
2
5V/12 SELECT
FB B 25
3 +
+ HA
24
HB
PWM 22
SINE GATING
HC
WAVE LOGIC 23
CO CONTROL & LA
SINE A OUTPUT 21
12
GENERATOR DRIVERS LB
19
LC
VSPEED 20
5 SINE C ISENSE
GENERATOR + 16
VMIN UVLO COMP
SPEED 0.5V
4
CONTROL
SINE B REFERENCE
RSPEED
GENERATOR
6
VDD GND RREF VREF
26 17 8 7
1
ML4423
PIN CONFIGURATION
ML4423
28-Pin Narrow PDIP (P28N)
28-Pin SOIC (S28)
SENSE A 1 28 CGM2
SENSE C 2 27 CGM1
SENSE B 3 26 VDD
VSPEED 5 24 HA
RSPEED 6 23 HC
VREF 7 22 HB
RREF 8 21 LA
RDT 9 20 LC
SINE A-C 10 19 LB
CO 12 17 GND
CT 03 16 ISENSE
COAST 14 15 F/R
TOP VIEW
2
ML4423
PIN DESCRIPTION
PIN NAME FUNCTION PIN NAME FUNCTION
2 FB C Input which feeds back the voltage 14 COAST A logic low input causes all output
applied to motor winding C. Reference drive transistors to turn OFF. An
voltage for windings A and B. internal pull-up drives COAST to VDD
if left unconnected.
3 FB B Differential input which, in
conjunction with FB C, feeds back the 15 F/R A logic high input causes phase A to
voltage applied across motor winding lead phase B, while a logic low input
B-C. causes phase A to lag phase B. An
internal pull-up drives F/R to VDD if
4 V MIN The voltage on this pin sets the left unconnected.
minimum sinewave amplitude at low
speeds. 16 I SENSE Motor current sense input.
5 V SPEED The voltage on this pin sets the 17 GND Signal and power ground.
frequency and amplitude of the
sinewaves generated at SINEA and 18 3PH/2PH Leaving this pin unconnected selects
SINEB. 3-phase drive. Connecting this pin to
VDD selects single/2-phase drive.
6 R SPEED An external resistor to ground provides
a variable current to the sinewave 19 LB Low side drive output for phase B.
generator. The current is proportional
to VSPEED. 20 LC Low side drive output for phase C.
7 V REF 8V reference output which can be 21 LA Low side drive output for phase A.
used for setting VSPEED and VMIN.
22 HB High side drive output for phase B.
8 R REF An external resistor to ground provides
a constant current used for setting the 23 HC High side drive output for phase C.
PWM frequency in conjunction with
CT. 24 HA High side drive output for phase A.
9 RDT An external resistor to ground sets the 25 5V/12V Input to select 5V or 12V output drive.
deadtime in the output stage to SELECT Leaving this pin unconnected selects
prevent cross-conduction in the power 5V output drive levels at the driver
devices. outputs. Connecting this pin to VCC
selects 12V output drive levels at the
10 SINE A-C A test output for observing the driver outputs.
internally generated sinewave used for
motor winding A-C. 26 V DD 12V power supply input.
11 SINE B-C A test output for observing the 27 C GM1 An external capacitor to ground sets a
internally generated sinewave used for pole in the feedback loop.
motor winding B-C.
28 C GM2 An external capacitor to ground sets a
12 CO An external capacitor to ground sets pole in the feedback loop.
the sinewave frequency in conjunction
with VSPEED and RSPEED.
3
ML4423
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which Thermal Resistance (qJA)
the device could be permanently damaged. Absolute Plastic DIP ....................................................... 52C/W
maximum ratings are stress ratings only and functional Plastic SOIC .................................................... 75C/W
device operation is not implied.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, VDD = 12V 20%, RSPEED = 160kW, RSENSE = 250mW, RREF = 200kW,
C0 = 0.47mF, CPWM = 220pF, RDT = 166kW, TA = Operating Temperature Range (Note 1).
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
REFERENCE
VREF Output Voltage 7.6 7.8 8.2 V
Line Regulation
Total Variation Line, Temperature
DIGITAL INPUTS
VIL Input Low Voltage 0.8 V
VIH Input High Voltage 2 V
OUTPUT DRIVERS
VOL Output Low Voltage IOL = 20mA, 5V/12V SELECT = VDD 1 V
IOL = 2mA, 5V/12V SELECT = open 0.1 V
VOH Output High Voltage IOL = 20mA, 5V/12V SELECT = VDD VDD 1 V
IOL = 2mA, 5V/12V SELECT = open 5 V
SINE WAVE GENERATOR
V PP Peak Voltage VSPEED = 4.4V 3.4 V
Frequency VSPEED = 4.4V 60 Hz
Distortion 5 %
PWM GENERATOR
Ramp Frequency 25 kHz
CURRENT LIMIT
Threshold Voltage 0.4 0.5 0.6 V
UNDERVOLTAGE LOCKOUT
Threshold Voltage 7.8 8.4 9.2 V
Hysteresis 0.5 V
SUPPLY
I CC VCC Operating Current 10 14 20 mA
Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
4
ML4423
FUNCTIONAL DESCRIPTION
The ML4423 generates 2 reference sinewaves separated SINEA and SINEB Generators
by 90 or 60 in a closed loop feedback system. These
sinewaves can be varied in amplitude and frequency by The capacitor to ground on C0 sets the frequency of the
the speed input. Signals across the motor windings are fed sinewave according to the following relationship. C0
back and the ML4423 drives the external power output should be a low temperature coefficient capacitor for
stage with the PWM sinewave signal necessary to cause stable output frequency.
the measured (feedback) output waveform to match the
internal reference sinewaves. The ML4423 provides fixed
period, variable duty cycle current limit protection, and VSPEED
a programmable dead time circuit to prevent cross R SPEED
conduction in the power output stage. An undervoltage fSINE =
lockout circuit turns off the external power transistors if 4C 0 0.170V (1)
VDD falls below 9V.
150 1.25
4.4V
120 1.00
NORMALIZED OUPTUT (V)
FREQUENCY (Hz)
90 0.75
60 0.50
RSPEED = 160
C0 = 0.47F
30 0.25
0 2 4 6 8 0 2 4 6 8
VSPEED (V) VSPEED (V)
5
ML4423
Current Limit OUTPUT DRIVE
Motor current is sensed on ISENSE (pin 16). RLIMIT should The 6 output drivers of the ML4423 drive the H and L
be selected so that outputs from 0 to 12 volts (with pin 25 tied to VCC +(12V)).
The outputs will drive about 10mA and are designed to
drive output buffers and high side drivers requiring 12V
RLIMIT = 0.5V (4) swings. The ML4423 provides lower current 0 to 5V drive
IMAX
for high/low side drivers requiring 5V input signal swings
with pin 25 left unconnected.
For a 2A current limit, RLIMIT = 0.25W. The 1kW resistor
and 330pF capacitor filter (shown in figure 3) filter the PROGRAMMABLE DEADTIME
high frequency flyback pulses (due to the freewheeling
diode recovery currents) occurring at the output. When A dead time circuit is provided to prevent shoot through
IMAX is reached the output power will be turned off for currents in the power output stage. The dead time is
the remainder of the current PWM cycle, which is controlled by a resistor to ground on RDT (pin 9). The dead
asynchronous with the sinewave frequency. Thus current time selected should be large enough to prevent cross
limit is fixed-period with variable duty cycle. conduction between the upper and lower power devices
of each inverter phase leg.
PWM SINE Controller
= 1.7V 49.5k + 500 (5)
500
= 170V
6
12V
A C
0.1F 0.47F 220pF
VCC C0 SINEA CPWM
Figure 3. 3-Phase Motor Controller with INT-100 High Voltage Drivers
26 12 10 13
99k 49.5k
VREF
7 PWM B
0.1F GENERATOR
8V REF ML4423
RREF 0.15F 99k
8
SENSEA
1 1k 500
1k
SENSEC 0.15F 0.30F
200k 2
SINEA
SENSEB
3
100k UNDER VOLTAGE
VSPEED LOCKOUT
5 +12V
0.1F SPEED FREQ.
HA
CONTROLLER PWM SINE 24
RSPEED AMPLITUDE A
6 CONTROLLER LA DRIVE +12V +VMOTOR
21 170400V
160k
OUTPUT HB
DRIVE & SHOOT 22
B
THROUGH LB DRIVE +12V
19
VMIN PROTECTION
4 SINEB HC
100k 23 10 C
LC 1 15
20 11
2 HIN +
1F 100
ISENSE 1k
CURRENT
16 PWR 12,13,14
LIMIT RLIMIT INT100
17 27 28 11 15 14 18 25 9
3 10
GND CGM1 CGM2 SINEB F/R COAST 3PH/2PH 5V/12V RDT 330pF 250m LIN 8
0.001F 0.001F SELECT 100
166k 4 5 7
Note: Use Extreme caution with high voltage AC motor control and drive circuitry.
When the motor is spinning at the desired speed, and the speed is rapidly reduced, HV POWER STAGE
the energy stored in the rotation will generate a voltage greater than the +VMOTOR node,
and destruction of the power transistors, high side driver, ML4423
controller and the power supply may occur.
ML4423
7
8
170 360V
+VMOTOR
SENSEA 1
+12V +
MUR150 330F
SENSEC 2 IR2118 400V
H A 24 2 IN HO 7
22
25V 3 COM VS 6 25V
1.0F
1F
4 N/C N/C 5
H B 22 AC MOTOR
A
MUR150
IR2118
1 VCC VB 8
2 IN HO 7 C
22
25V B
H C 23 1.0F 3 COM VS 6 25V
1F
ML4423 4 N/C N/C 5
+
1.0F
MUR150
2N3904
IR2118
L A 21
1 VCC VB 8
2N3906 2 IN HO 7
25V 22
1.0F 3 COM VS 6
C21
25V
L B 19 4 N/C N/C 5 1F
22
1k
ISENSE 16 250m RLIMIT
330pF
5V/12V SELECT RDT FEEDBACK
25 9 NETWORK
240k
+12V SENSEC SENSEB SENSEA
ML4423
PHYSICAL DIMENSIONS inches (millimeters)
Package: P28N
28-Pin Narrow PDIP
1.355 - 1.365
(34.42 - 34.67)
28
0.020 MIN
(0.51 MIN)
0.180 MAX
(4.57 MAX)
Package: S28
28-Pin SOIC
0.699 - 0.713
(17.75 - 18.11)
28
PIN 1 ID
1
0.024 - 0.034 0.050 BSC
(0.61 - 0.86) (1.27 BSC)
(4 PLACES) 0.095 - 0.107
(2.41 - 2.72)
0 - 8
9
ML4423
ORDERING INFORMATION
Micro Linear 2000. is a registered trademark of Micro Linear Corporation. All other trademarks are the property of their
respective owners.
Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116;
5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470; 5,565,761; 5,592,128; 5,594,376;
5,652,479; 5,661,427; 5,663,874; 5,672,959; 5,689,167; 5,714,897; 5,717,798; 5,742,151; 5,747,977; 5,754,012; 5,757,174;
5,767,653; 5,777,514; 5,793,168; 5,798,635; 5,804,950; 5,808,455; 5,811,999; 5,818,207; 5,818,669; 5,825,165; 5,825,223;
5,838,723; 5.844,378; 5,844,941. Japan: 2,598,946; 2,619,299; 2,704,176; 2,821,714. Other patents are pending.