1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
D D
C C
B B
A A
Title
Number RevisionSize
A2
Date: 2013-5-31 Sheet of
File: G:3\..\
.SCHDOC Drawn By:
P1.0
1
P1.1
2
P1.2
3
P1.3
4
P1.4
5
P1.5
6
P1.6
7
P1.7
8
RST/VPD
9
P3.0/RxD
10
P3.1/TxD
11
P3.2/INT0
12
P3.3/INT1
13
P3.4/T0
14
P3.5/T1
15
P3.6
16
P3.7
17
XTAL2
18
XTAL1
19
GND
20
P2.0
21
P2.1
22
P2.2
23
P2.3
24
P2.4
25
P2.5
26
P2.6
27
P2.7
28
PSEN
29
ALE/PROG
30
EA
31
P0.7
32
P0.6
33
P0.5
34
P0.4
35
P0.3
36
P0.2
37
P0.1
38
P0.0
39
VCC
40
U1
STC90C52
+5V
12
Y1
12M
15pF
C14
15pF
C11
0.1uF
C1
微控制器(STC90C52单片机)
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
RS
RW
EN
470uF/25V
C8
0.33uF
C9
18V
D1
Bridge1
P10_CLK
1
2
P1
220VAC
系统电源电路
P11_Dout
S1
SW-PB
10K
R1
+5V
10uF
C4
模数转换电路
8
5
2
3
4
6
7
1
U8
OP07DP
0.1uF
C24
0.1uF
C23
20K
R18
+5V
-5V
3K
R20
60K
R19
Current_Sample
Current
22uF/16V
C20
0.1uF
C21
D2
Bridge1
0.01uF
C22
1K
R6
150K
R5
0.1uF
C26
D3
Bridge1
0.01uF
C27
Current_Sample
Voltage_Sample
电压采样电路
电压信号滤波电路
VSS
1
VDD
2
Vee
3
RS
4
R/W
5
E
6
DB0
7
DB1
8
DB2
9
DB3
10
DB4
11
DB5
12
DB6
13
DB7
14
A
15
K
16
U7
LCD1602
+5V
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
RS
RW
EN
+5V
液晶显示电路
10K
R9
Res2
10K
R10
Res2
10K
R11
Res2
10K
R12
Res2
10K
R13
Res2
10K
R14
Res2
10K
R15
Res2
10K
R16
Res2
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
+5V
8
5
2
3
4
6
7
1
U6
OP07DP
300K
R3
0.1uF
C19
0.1uF
C18
20K
R2
+5V
Voltage
Voltage_Sample
C1+
1
C1-
3
C2+
4
C2-
5
V+
2
V-
6
T1IN
11
T2IN
10
R1OUT
12
R2OUT
9
T1OUT
14
T2OUT
7
R1IN
13
R2IN
8
VCC
16
GND
15
U2
MAX232
C3
104
C2
104
C5
105
1
6
2
7
3
8
4
9
5
J1
+5V
C10
104
+5V
单片机串行通信接口
-5V
300K
R4
300K
R7
300K
R8
电流采样电路
RXD
TXD
TXD
RXD
T1
220V-18V
+5V
Vin
1
GND
2
Vout
3
U3
7805
C6
0.1uF
10uF/16V
C7
-5V
Vin
1
GND
2
Vout
3
U4
LM7905
C16
0.1uF
10uF/16V
C15
470uF/25V
C12
0.33uF
C13
10uF/25V
C17
电流信号滤波及放大电路
SCLK
1
MCLK IN
2
MCLK OUT
3
CS
4
RESET
5
AIN2+
6
AIN1+
7
AIN1-
8
REF IN+
9
REF IN-
10
AIN2-
11
DRDY
12
DOUT
13
DIN
14
VDD
15
GND
16
U5
AD7705
12
Y2
2.5M
22pF
C29
22pF
C28
+2.50V
DRDY
Current
Voltage
10K
R37
RESET
0.1u
C30
P10_CLK
P12_Din
P11_Dout
P12_Din
DRDY
+2.50V
Refer
3
Anode
2
Cathode
1
U9
TL431
+5V
1K
R21
+5V
+5V
RESET
50mR
R17
22uF/16V
C25