M30620ECFS datasheet(123/621 Pages) RENESAS

123 / 621 page

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Timers’ functions for three-phase motor control

108

Timer A4 output

Trigger signal for

timer Ai start

(timer B2 overflow

signal)

Timer B2

U phase

Dead time

A carrier wave of triangular waveform

Carrier wave

Signal wave

Timber B2 interrupt occurres

Rewriting timer A4 and timer A4-1.

Possible to set the number of overflows to generate an

interrupt by use of the interrupt occurrences frequency

set circuit

U phase

output signal

Note: Set to triangular wave modulation mode and to three-phase mode 1.

Control signal for

timer A4 reload

The three-phase

shift register

shifts in

synchronization

with the falling

edge of the A4

output.

U phase

output signal

Figure 1.18.6. Timing chart of operation (1)

phase waveform. In this way, a waveform can be picked up from the applicable terminal in a manner in

which the "L" level of the U phase waveform doesn’t lap over that of the U phase waveform, which has the

opposite phase of the U phase waveform. The width of the “L” level too can be adjusted by varying the

___

values of timer B2, timer A4, and timer A4-1. In dealing with the V and W phases, and V and W phases,

the latter are of opposite phase of the former, have the corresponding timers work similarly to dealing with

___

the U and U phases to generate an intended waveform.

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