Page 65 - CNC Robotics

CNC Robotics

APPLICATION NOTE
Figure 16 : PhaseChoppingWaveforms.The example shows AS winding energizedwith A positive with
respectto B. Control is high.

A

•
NOTE THATCURRENT IN
SENSe:RES/SlOR IS
SENSE INTERMITTENT
R<SlSTtlR
CURREN T
LOAD
C~R E NT __
FLIPFLOP FU P FLOP RESET SlOWISH DECAY
SET BY osc.. BY COMPARATOR Tt1NOUut1 TI AND oJ

Fig lre 17 : Inhibit Chopping.The drive current (01 , wirding, 04) in this case is intempted by activating
INH1. The decay path through 02 and 03 is fasterthanthe path Y of Figure15.

v•
•
I
r ·_·_·.... L ,
i
DI 03 :
I
I
I
••_ ._._ . _ .L. _
I
DZ D4 ,--,:>-t~-OB

I
O---------~+-R.--+ I
SENSI
I
t

DRIVE CURRENT _ ._._~
RECIRCULATION -----...

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