Biomedical Engineering Reference
In-Depth Information
12 VIN
TDK PCU-554
IC1
SW1
J7
2
3
1
2
+
VIN
ADJ
VOUT
VIN
HVOUT
HVAC
C
-
+
C1
100uF
C2
0.01uF
C3
0.01uF
+
C4
100uF
R1
240
LM317/TO220
OUT1
J5
R4
R5
R6
R7
OUT 2
HVGND
HVout
R2
5K
100
100
100
30
5
4
ESD
PROBE
Voltage Multiplier
K1
>10KVDC SPDT VACUUMRELAY
R3
750
3
1 2
GN
D
OUT GND
Alligator Clip
C5
150pF,15KV
D
1
1N4007
SW2
SP1
+
12V Piezo Buzzer
ESD FIRE
-
(a)
C06
0.001uF, 2KV
C07
0.001uF, 2KV
C08
0.001uF, 2KV
C09
0.001uF, 2KV
C10
0.001uF, 2KV
C11
0.001uF, 2KV
J3
J1
A
C
D2
D4
D6
D8
D10
D7
D3
D5
D9
D11
RG53
RG53
RG53
RG53
J4
J2
RG53
RG53
RG53
RG53
RG53
RG53
B
D
C12
0.001uF, 2KV
C13
0.001uF, 2KV
C14
0.001uF, 2KV
C15
0.001uF, 2KV
C16
0.001uF, 2KV
(b)
(b)
VM1
HVAC
HVAC
C
ESD Probe
50M, 15kV rating
R4
100
R4
100
R4
100
R4
30
4
HVGND
HVGN D
HVout
3
1N 4007
1
2
Voltage Multiplier
C5
150pF, 15k V
K1, >10kVDC, Vacuum Relay
SW 2
+12V
(c)
Figure 4.20
A simulator which produces waveforms that are closer to a professional unit compliant with IEC801-2 (1991) can be built
using surplus high-voltage components. (
a
) A cold-cathode
fluorescent lamp driver and a quintupler produce the high voltage to charge the
ESD model capacitor. A vacuum relay transfers the charge to the device under test via the ESD resistor network. (
b
) The quintupler should
be built as a stand-alone module, making it possible to reverse the ESD polarity. (
c
) If necessary, a SPST vacuum relay can replace the SPDT
unit.
fl
as Surplus Sales of Nebraska and Fair Radio Sales for a suitable SPDT relay with at least a
10-kV contact rating and a 12-V dc coil. If you cannot
fi
find a suitable SPDT relay, you can
use a 50-M
resistor (with at least a 15-kV rating) to charge the 150-pF capacitor constantly,
and use a SPST vacuum relay to deliver the ESD to the ESD resistor network.
Use carbon-composition (noninductive), high-voltage resistors for R4 -R7 and build the
high-voltage discharge path with the shortest possible lead lengths. This will ensure low
path inductance and fast ESD pulse rise times. When pushbutton switch SW2 energizes
K1, high voltage will be present at the ESD probe. A piezoelectric buzzer is used to warn
Ω
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