X-Ray Systems - PowerPoint PPT Presentation

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X-Ray Systems

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Title: X-Ray Systems Author: Nawapak Last modified by: Nawapak Eua-anant Created Date: 6/18/2001 2:45:31 AM Document presentation format: On-screen Show – PowerPoint PPT presentation

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Title: X-Ray Systems


1
X-Ray Systems
2
??????????????????????????????????????
kVp
???????? Transformer
??????????? Power Supply
Switch
????????????? ????????????? ???????? Rectifier
?????????? Control Circuit
???????????? X-Ray Tube
3
???????????????????????????????????????
  1. ?????????????? (Power supply)
  2. ??????????????????? (High voltage transformer)
  3. ?????????????????????????????????? (Rectifier
    circuit)
  4. ?????????? (Control circuit)
  5. ???????????? (Timer)
  6. ???????????????????????????? (kVp control
    circuit)
  7. ???????????????????????????????????? (Filament
    power supply)
  8. ???????????? (X-Ray tube)

4
??????????????????????????????????????????????
1. ??????????????? - ??????????? ??????????
?????????????? - ??????????? ??????????
????????????? 2. ??????????????????????????????
- ??????????????????????????????????? 3.
??????????????????????? 4. ??????????????????????
??????????????????????
5
??????????????? ???????????????????? ???????????
??????????
??????????????
?????????????????
V Voltage (???????????, Volt) I Current
(??????????, Ampere) R Resistance (???????????,
Ohm)
6
??????????????? ??????????????????? ???????????
??????????
??????????????
- ??????????? (V) ??? ?????????????????? (I) ???
- ??????????? ( R ) ??? ??????????????? ( I
)??????????
7
??????????????? ???????????????????? ???????????
??????????
?????????????
P Power (??????????, Watt) V Voltage
(???????????) I Current (??????????) R
Resistance (???????????)
????????? R ????? ??????????????????????????
????????????????? ???? ????????????????????
8
????????????? VS ??????????????
????????????????? (Direct current)
?????????????????? (Alternating current)
????????????? ???????????????????????? ?????
??????????????????????
?????????????? ????????????????????????? ???
????????????-?????????????
9
??????????????
????????????????????
A Amplitude (Volt) f Frequency (???????)
(Hertz cycle/second)
1 Period (T)
V
Amplitude or Peak
Time (t)
10
??????????????
?????????????????????????
V

Time
-
I
V
R
11
????????????? VS ??????????????
?????????????
??????????????
12
???????????????????????????
?????????????????????????????????????????????
?? ?????????????????????? ????????????????
????????? Root Mean Square Voltage (Vrms) ????
????????
13
???????????????????????????
?????????????????????????????????????
??????????????????????????? ??????????????????????
?? Root Mean Square ???? ????? 220 V
????????? ??? Vrms 220 Volt ??????? Peak
?????? Volt.
????????????????????????????????????????????????
14
???????????????????????
?????????????????????????????????????????????
?????????????????????? ???????????????????????????
????????????????????????????
??????????????????????????? 1. ????? 2 ????? -
???????????? (Primary coil) - ??????????????
(Secondary coil) 2. ???????? ( Core )
Primary coil
Secondary coil
Core
15
???????????????????????
?????????????????????????????????????????
(Primary coil) ????? ?????????????????????????????
?????????????????????????????????
I
Primary coil
Secondary coil
V2
V1
????????????
??????????????????????????????????????????????????
???????????????????? (Secondary coil)
16
???????????????????????
?????????????????????????????????????????????
??????????? ??????????????
I2
I1
Load
N1
N2
V2
V1
Primary coil
Secondary coil
V1 ?????????????????????????? N1
?????????????????????? I1 ??????????????????????
???
V2 ???????????????????????????? N2
???????????????????????? I2 ????????????????????
???????
17
???????????????????????
????????????????????????????
I2
I1
Load
N1
N2
V2
V1
Vmax
Primary coil
Secondary coil
??????????????????????????????????????????????????
??????????????
18
????????????????????????????????????????????
(Rectifier)
???? Rectifier ??????????????????????????????
???????????????? ?????????????????????????????????
??? ???? Rectifier ??????????????? (Diode)
??????????????? (Capacitor)
Diode ????????????????????????????????????????????
???????????
Vin
Vout
Vout


Time
Half wave rectifier
19
????????????????????????????????????????????
(Rectifier)
???? Full Wave Rectifier
Bridge Diode
-

Vin


Time
-
-
20
????????????????????????????????????????????
(Rectifier)
Output ????????? Full wave rectifier
???????????????????? (Ripple) ????
Vmax
Ripple factor 100
Vmin 0
Ripple factor ???????????????????????????????????
????????? ????????????? Ripple factor
?????????????????????????????????
21
????????????????????????????????????????????
(Rectifier)
??????????? Ripple factor
??????????????????????????????????? ?????????
Rectifier
?????????????????????
?????????????????????
V
V
Time
Time
22
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