ATMega128 I/O Power Control

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2 Νοε 2013 (πριν από 3 χρόνια και 9 μήνες)

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KyungHee Univ.

2
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0

ATMega128 I/O Power Control

( Solid State Switch, Relay)

KyungHee Univ.

2
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1

Computer
-
Controlled Current Switches

BJT Transistors


전류

제어

Switch(BJT)


NPN Transistor Model


PNP Transistor Model

KyungHee Univ.

2
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2


여러

가지

Relay


KyungHee Univ.

2
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3

8.5.1 Introduction to Relays


제어

회로와

다른

전원으로

구동하는

Relay




KyungHee Univ.

2
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4

여러

가지

제어소자의

사진

EM, Solid
-
state, Reed Relay

KyungHee Univ.

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5

Electromagnetic Relays


구조

KyungHee Univ.

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6

Electromagnetic Relays Basics


여러

가지

Relay


구조




Relay


구조에

따른

Activation Sequence

KyungHee Univ.

2
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7

R
eed Relay


구조

KyungHee Univ.

2
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8

Solenoid Relay


구조

KyungHee Univ.

2
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9

Solenoid Relay

사진

KyungHee Univ.

2
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10

Interfacing EM Relays, Solenoids, and DC
Motors


Current Sink
구조



Snubber

diode

KyungHee Univ.

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11

EM Relays


Solenoids


Interfacing


KyungHee Univ.

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12



방향

DC Motors Control
회로
(High

Current
MOSFET)



KyungHee Univ.

2
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13

Isolated


방향

DC Motors Control
회로



KyungHee Univ.

2
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14

Isolated


방향

DC Motors Control
회로
(High

Current MOSFET)



KyungHee Univ.

2
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15

Isolated


방향

DC Motors Control
회로
(High

Current MOSFET)



KyungHee Univ.

2
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16



방향

H
-
Bridge

DC Motors Control
회로



KyungHee Univ.

2
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17

Isolated


방향

H
-
Bridge

DC Motors Control
회로



Dual Full
-
Bridge Driver L298


High voltage : 46V


high current : 4A


Dual full
-
bridge driver


Accept standard TTL logic levels


Drive inductive loads such as


Relays, Solenoids, DC and, Stepping motors

KyungHee Univ.

2
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18

L289 Block Diagram

KyungHee Univ.

2
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19

M

M

KyungHee Univ.

L298


이용한

DC
Motor and Stepper Controller

Current Motor Supply Logic


Current

Sensing Voltage Enable Supply Enable

Sensing


A Out Out Vs In A In GND Vs In B In Out Out B


1 2 1 2 3 4


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15


1 2 3 4 5 6


GND Dir1 En1 Dir2 En2 Vcc


In Put Control Signal Connector

+Vout 1

Motor 1

-
Vout1

+Vout 2

Motor 2

-
Vout2

Vs

Supply

Voltage

GND

+

-

470uF

35V

104

1

+

1

+

2

4

3

3

4

2

Vs

2W06

2W06

L298N

2

7414

1

4

7414

3

Vs

Supply

Voltage

GND

KyungHee Univ.

2
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21

Solid
-
State Relay(
Triac
)

KyungHee Univ.

2
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22

Stepper Motors

KyungHee Univ.

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23

Stepper Motors Interfacing



KyungHee Univ.

2
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Stepper motor control

sequence


PORTB

Output

A

A


B

B


10

Activate

Deactivate

Activate

Deactivate

9

Activate

Deactivate

Deactivate

Activate

5

Deactivate

Activate

Deactivate

Activate

6

Deactivate

Activate

Activate

Deactivate

KyungHee Univ.

2
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25

Double Circular Linked List


이용한

Stepper Motors
제어

Data Structure

KyungHee Univ.

2
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26

L293 Driver


이용한

Stepper Motor
Interface