AN2009 datasheet(11/39 Pages) STMICROELECTRONICS

No. de pieza	AN2009

Descripción Electrónicos	PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC

PDF	39 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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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)

(I)

CHANNEL

PWM MANAGER

(V)

VDD

MANAGER

12-bit counter

Phase U

Phase W

U, V, W

Phases

Phase U

Phase V

PWM GENERATOR

12-bit THREE-PHASE

OAP

OAN

MCPWMU

MCPWMV

MCPWMW

(V)

PCN bit

OAZ(MCCFI1)

OAON bit

CFAV bit

ADC

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