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IXDN0036 Scheda tecnica(PDF) 33 Page - IXYS Corporation

Il numero della parte IXDN0036
Spiegazioni elettronici  Several lamp types
PDF  41 Pages
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Produttore elettronici  IXYS [IXYS Corporation]
Homepage  http://www.ixys.com
Logo IXYS - IXYS Corporation

IXDN0036 Scheda tecnica(HTML) 33 Page - IXYS Corporation

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Conclusion
7-34
ATAVRFBKIT / EVLD001 User Guide
7597A–AVR–02/06
The lamps are dimmed for as long as the switch is pressed or until the minimum or max-
imum dimmer setting is reached.
7.2
Appendix 2:
Capacitor
Coupled Low
Voltage Supply
Small currents for the low voltage supply can be obtained from the AC line at
low loss by means of capacitor coupling as shown in the figures below. To esti-
mate the required size of the coupling capacitor, use the following relationships
for current, charge, voltage and capacitance.
1.dQ/dt = I
DC
Figure 7-1. Negative Line Half Cycle
Figure 7-2. Positive Line Half Cycle
1.dV = 2Vpk-Vo-2V
D
2.dQ = CdV or C = dQ/dV
For example, to obtain 15 ma at 20 VDC from a 220 Vrms 50 Hz line:
1.dQ/dt = (15 millijoules/sec)/(50 cycles/sec) or 0.3 millijoules / cycle.
AC
C1
VD
VD
C2
“Negative” line half -cycle:
C1 charges to Vpk - VD with polarity shown.
Vo
Ich1
IDC
-VPK
-VC1 +
AC
C1
VD
VD
C2
“Positive” line half -cycle:
C1 charges to Vpk - VD - Vo with polarity shown.
Vo
Ich2
IDC
+VPK
+ VC1 -



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