7/25/2019 4-Phase Detector _a

1/17

I. TITLE

7/25/2019 4-Phase Detector _a

2/17

II. INTRODUCTIONMost of the devices of MOTION CONTROL

GROUP specially the BD6!!! se"ies#yo$ %illal%ays &'d the ()Phase detecto"ci"c$it*+U,-,/ 0od$le. 1s a p"o2"a00e"a'd3o" de4$22e"# it is ve"y i0po"ta't to 5'o%ho% this 0od$le %o"5s. If yo$ co$ld$'de"sta'd ho% it %o"5s# the' it 0i2ht 4eeasy fo" yo$ to $'de"sta'd the testi'2 ofBD6!!! se"ies a'd ho% this device is applyto so0e of elect"o'ic 2ad2ets.

7/25/2019 4-Phase Detector _a

3/17

III. The +U,-, 7o% it%o"5s8

7/25/2019 4-Phase Detector _a

4/17

The 0od$le $se 0ai' I.C. TheB1-,9+ a'd

I'side the +U,-,Lets take a closerlook at IC1. This IC

is a quad-comparator I.C.

7/25/2019 4-Phase Detector _a

5/17

Th"eshold volta2es

a"e set 4y di

7/25/2019 4-Phase Detector _a

6/17

*+ample, I$ we hae !" as CC/ and'utput o$ %&T are 0igh1!/ 2idand Low4/ we can compute the

T0-0/ T0-20 5 T0-2L

T0-0T0-6 4.7cc-4.7 11.7

T0-20T0- 4.!7cc84.7 .7

T0-2LT0-C 4.!7cc-4.7 7.7

T0-LT0-% 84.7(set 9y re$erenceoltage#

%i:erential Circuit,

%o not 9e con$used why 1! was consideredas 0igh-state instead o$ !" and as 2id-state. It is 9ecause the actual output o$ the%&T('&T;;# will pass thru diider ckt.(1

7/25/2019 4-Phase Detector _a

7/17

I'side the +U,-,

ow/ lets hae acloser look at

IC7(*>2?4"@#.

7/25/2019 4-Phase Detector _a

8/17

The O$tp$t volta2esof the co0pa"ato"s%ill e'te" to IC@ a'dse"ved as its i'p$t

data.

Each data that e'te" i' IC@is co't"olled a'd selected

depe'di'2 o' state of

add"ess li'e *RLA-/

The o$tp$t p"od$ces7i2h*.>/ o"

Lo%*,>/. It is 7i2h%he' all ()i'p$t data4ei'2 selected a"e

7i2h# else it is Lo%

7/25/2019 4-Phase Detector _a

9/17

Let us hae an e+ample 9ased onactual testing, I' testspecs# e=pected

o$tp$ts a"e *7#L#7#L/

I' p"o2"a0# data

that e'te"s to IC@%ill 4e selected 4y

its add"ess li'e.

I' Mac"o fo"7L7L# the

co""espo'di'2"elays a"e the

7/25/2019 4-Phase Detector _a

10/17

I' p"o2"a0 I' o"de" to have a hi2ho$tp$t*.>/# all ()i'p$tselected data sho$ld 4e

hi2h. If 'ot# the' this0ea's that the o$tp$t of

DUT*OUT!!/ did 'ot

p"od$ced a 7#L#7#L state.

I1A0/ I!AL/ I3A05 I"AL data are

selected

This is how =&414! module detectsthe "-phase outputs o$ the %&T.

7/25/2019 4-Phase Detector _a

11/17

ow/ lets make an e+ample on howthe pointer moe while the state o$

'&T;; are changing.

I>. PURPO;E O+ +U,-,

To understand $urther the purpose o$ =&414!/ let us see Brsthow the "-phase output o$ %3+++ deice can make the motorrotate in =ull-@tep mode.

7/25/2019 4-Phase Detector _a

12/17

6s you noticed/ the @pinning steps o$pointer are controlled 9y thepotentials $rom output oltages o$%3+++ deice. In the e+ample a9oe/the spinning arrow moes in a $ull-step and the arrow are pointed in9etween two-0igh state '&T>&T.

OUT!!7#L#7#L

0

L

0L

7/25/2019 4-Phase Detector _a

13/17

OUT!!L#7#7#L

0

L

0L

7/25/2019 4-Phase Detector _a

14/17

7/25/2019 4-Phase Detector _a

15/17

OUT!!7#L#L#7

0

L

L0

7/25/2019 4-Phase Detector _a

16/17

Fhy this 0od$le is $sed81fte" %e have see' ho% the 0ove0e'ts of the

poi'te" is cha'2i'2# %e %ill 'otice that thestate of the ()o$tp$t*OUT!!/ of DUT is

the o'e %ho dete"0i'es ho% the poi'te" %ill0ove. I' o"de" fo" the ()o$tp$t of the DUT to0a5e a 6, de2"ee spi' a'2le*i' a'y step/# theact$al OUTPUT of the DUT sho$ld coi'cide to its

e=pected OUTPUT a'd to 2$a"a'tee that theO$tp$t state of the DUT is sa0e as e=pected#%e $sed +U,-, 4eca$se it detects the ()Phaseo$tp$t simultaneously.

7/25/2019 4-Phase Detector _a

17/17

Do'e 4y E'2". oh' Be"'a"dTole'ti'o

Test Develop0e'tDepa"t0e't