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MBUS模块电源隔离应用原理图


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接口保护电路,防短接

5V E?
PIR?02 PIE?01

A

R? 3.3V
PIR?01

R?
PIE?04 PIR?01 PIR?02

M_TXD

M+

PIPTCA??300mA01

PIPTCA??300mA02

M_BUS+

A

750R MCU_TXD PIE?02 PC817

2K R?
PIE?03 PIR?01 PIR?02 PIV?0B

PIV?0C
V? 8050 R?
PIR?01

PITVS:42V0A
TVS:42V

PTCA:300mA

0R
PIR?02

PIV?0E

PITVS:42V0K
PIJ201 PIJ202 PIJ203

470R SGND 3.3V E?
PIR?02 PIE?04

SGND

PIJ204

MCU_RXD

R?
PIR?01

R?
PIE?01 PIR?02 PIR?01

5V

PIV?0C

2K
PIV?0B

V? 8050
PIR?01

1.2K R?
PIR?02 PIE?03 PIE?02

M_RXD M 5V或12V或24V 1 2 10

0R

PIV?0E

R?
PIR?02 PIR?01

PC817

470R B GND 5V

PIC601
C6 470uF/35V R? 1.2K R? 3.3V
PIR?01 PIR?02

PIM01

12V~24V VCC

GND

PIM010

5V

PIR?01
E?
PIE?01 PIE?04

PIC602

PIC701

PIM02

C8 BUS_POW
PIM09 PIC801

SGND
PIC802

B

C7 M_RXD PIM03 3 M_RX_RN 4 PIM04 M_TXD PIM05 5 6 MCU_RXD RX_EN MCU_TXD

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PIR?02

PIC71uF 02
SGND SGND

470uF/63V 8 MBUS+ PIM08 M+

SGND

M_RX_EN

1K MCU_RX_EN PIE?02 PC817 SGND

PIE?03

RES GND

PIM07 PIR1302

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R13
PIR1301

PIM06

27/5W

SGND

MB

光耦隔离电路: 增加三极管驱动,以加快隔离侧电平的上升沿、下降沿速度。 光耦两侧的电阻值需要根据光耦的CTR 特性调整。
J2 C 1 2 3 4 CON4 GND MBUS+ C

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D

Title Size A3 Date: File: 1
NLCO

Number

Revision

2018-5-6 Sheet of H:\AD_PCB 设计项目\新MB_BOARD\485GLMB.SchDoc Drawn By: 7 8

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