tb6539f TOSHIBA Semiconductor CORPORATION, tb6539f Datasheet - Page 12

• Manufacturer Part Number: tb6539f
• Description: 3-phase Full-wave Sine-wave Pwm Brushless Motor Control
• Manufacturer: TOSHIBA Semiconductor CORPORATION

with the triangular wave and a sine-wave PWM signal is generated.
rising (or rising) edges are counted. The counted time is used as the data for the next 60° phase of the
modulation waveform.
item is 1/32 of the time width of the 60° phase of the previous modulation waveform. The modulation
waveform moves forward by the width.
time (1) from HU: ­ to HW: ¯. Similarly, data (2)’ moves forward by the 1/32 time width of the time (2) from
HW: ¯ to HV: ­.
same time width until the next edge occurs.
modulation waveform is reset in sync with the rising edge of the HU signal at every electrical angle of 360°.
Thus, when the Hall signal rising edge is mispositioned or at acceleration/deceleration, the modulation
waveform is non-consecutive at every reset.
The modulation waveform is generated using Hall signals. Then, the modulation waveform is compared
The time (electrical angle: 60°) from the rising (or falling) edges of the three Hall signals to the next
There are 32 items of data for the 60° phase of the modulation waveform. The time width of one data
In the above diagram, the modulation waveform (1)’ data moves forward by the 1/32 time width of the
If the next edge does not occur after the 32 data items end, the next 32 data items move forward by the
The phases are matched between every rising edge of the HU signal and the modulation waveform. The
S
V
HU
HV
HW
S
S
Sw
U
V
* t = t(1) ´ 1/32
*t
*t
1
(5)
2
3
4
(6)
5
6
32 data items
(6)’
(1)
(1)’
(1)’
(2)
12
(2)’
(3)
30
31
32
(3)’
*HU, HV, HW: Hall signals
TB6539N/F
2002-06-12