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AN2009 Datasheet(PDF) 11 Page - STMicroelectronics

Part # AN2009
Description  PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2009 Datasheet(HTML) 11 Page - STMicroelectronics

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PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
Figure 7. The PWM manager
The PWM manager manages two different integral parts of the way the ST7MC drives the
motor:
– Current regulation or limitation
– Generation of the PWM signal applied on the switches
The PWM manager has two distinct motor driving modes: voltage mode and current mode. In
both cases, the motor control 12-bit timer peripheral has an essential role.
In Figure 7, the PWM manager uses the paths indicated by the (I) symbol for current mode
and by the (V) symbol for voltage mode.
MCO5
MCO4
MCO3
MCO2
MCO1
MCO0
MCCFI0
MCCREF
NMCES
MEASUREMENT
WINDOW
GENERATOR
CURRENT
VOLTAGE
MODE
(I)
(V)
(V)
(I)
R1
C
(I)
CHANNEL
PWM MANAGER
(V)
R2
VDD
MANAGER
12-bit counter
Phase U
Phase W
U, V, W
Phases
Phase U
1
Phase V
PWM GENERATOR
12-bit THREE-PHASE
OAP
OAN
MCPWMU
MCPWMV
MCPWMW
(V)
R3
PCN bit
OAZ(MCCFI1)
OAON bit
+
-
CFAV bit
ADC



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