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IXDN0036 bảng dữ liệu(PDF) 33 Page - IXYS Corporation |
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IXDN0036 bảng dữ liệu(HTML) 33 Page - IXYS Corporation |
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33 / 41 page ![]() 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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