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PDF ECN3021 Data sheet ( Hoja de datos )
| Número de pieza | ECN3021 | |
| Descripción | High Voltage Monolithic IC | |
| Fabricantes | Hitachi | |
| Logotipo |  |
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HIGH-VOLTAGE MONOLITHIC IC
ECN3021
ECN3021 is a single chip three-phase bridge inverter IC which has 6 IGBTs in the circuit.
Especially, it is very suitable for controlling the speed of 3-phase DC brushless motors to which
converted AC200~230V power supplies are applied. Fig. 1 shows the internal block diagram.
Functions
∗ Integrated charge pump circuit
∗ Integrated free wheel diodes
∗ Integrated PWM circuit
∗ Integrated FG circuit
∗ Integrated over current protection circuit
∗ Integrated rotating direction monitor circuit
Features
∗ Speed control for a 3-phase DC brushless motor is available with an external microprocessor.
∗ Bottom arm circuits can be operated in 20kHz chopping frequency of PWM.
Microprocessor
Analog
output
VCC
FG
DM
VSP
VCC(15V)
CB
VB supply
C0
VB
RU
RV
RW
HU HV HW
D2
C2
+-
C+ C-
D1
+
C1
-
CL
VS1
Clock
Charge Pump
FG
Rotating
Direction
Monitor
Comparator
+
-CMP
3-Phase
Distributor
SAW wave
Generator
Clock
CR VTR
RTR
CTR
Top Arm
Driver
Bottom Arm
Driver
Over Current Sense
-
+
Vref
0.5V
GL RS
VS2
GH1
VS
Hall ICs
MU
MV
MW
Motor
GH2
RS
Fig. 1 Block diagram
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PDE-3021-0
1 page  
ECN3021
5.3 PWM Operation
The PWM signal is produced by comparing the input voltage at VSP terminal with the voltage from the
internal SAW wave. The duty of the PWM signal can be changed by the triangular wave amplitude level,
from the minimum point of VSAWL to the maximum point of VSAWH, and when the level is under
VSAWL, the duty becomes 0%, and when the level is over VSAWH, the duty becomes 100%. In addition,
chopping with the PWM signal is operated in the bottom arm circuit.
5.4 Over Current Limiting Operation
This IC detects over current by checking the voltage drop at the external resistance RS. When the input
voltage at RS terminal exceeds the internal reference voltage(Vref), this IC turns off the output of the bottom
arm circuit. After over current detection, reset operation is done at every period of the inner clock signal
(VTR terminal).
5.5 Rotating Direction Sense Operation
The rotation direction of the motor is detected by the signal at DM terminal. Table 1 shows the output signal
for the rotation direction.
Table 1.
Output signal for the rotation direction
Rotating Direction
U-V-W
U-W-V
Output (DM terminal)
L
H
5.6 Vcc under voltrage Detection
When Vcc supply voltage becomes below LVSDON(11.5V typ), all of the IGBTs shut off.
This condition is recovered when Vcc supply voltage becomes greater than LVSDOFF(12.0V typ).
PDE-3021-0
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ECN3021.PDF ] | |
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