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Ac dimmer schematic_v.2
1. This document is a circuit diagram for an AC dimmer that uses a triac and MOC3021 optocoupler to control the amount of power delivered to a load from an AC power source. 2. The circuit uses a 4N25SR2VM optocoupler to detect zero crossings in the AC waveform and send signals to a MOC3021 optocoupler which triggers the triac and controls the phase angle of the AC waveform to adjust the load voltage. 3. Resistors R1-R3 set the trigger level of the optocouplers while R4-R6 provide isolation between the AC and control sides of the circuit.
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Ac dimmer schematic_v.2
- 1. 1 1 2 2 3 3 4 4 D D C C BB A A 1 wwwainmojoacom1 InMOJO aC Dimmer 1.0 v.2.0 11/12/2012 1:34:24 PM Title Size: Number: Date: Revision: Sheet ofTime: A4Designed by: Charith Fernando Approved by: Charith Fernando License type: Released under the Creative Commons Attribution Share-Alike 3.0 License http://creativecommons.org/licenses/by-sa/3.0 Q1 Triac GND 1 2 P2 AC 110V MOC3021 AC Dimmer zero crossing detection 1k R6 U1 4N25SR2VM U2 MOC3021SM 10k R1 GND a3.3V AC 2 Va 1 AC 4 V- 3 D1 DF1504S 470 R5 GND 330 R4 LD-AC ZERO-CROSS DIMMER a3.3V GND ZERO-CROSS DIMMER 1 2 P3 AC LOAD 1 2 3 4 P1 Signal 120K R2 120K R3 PID101 PID102 PID103 PID104 COD1 PILD0AC01 PILD0AC02 COLD0AC PIP101 PIP102 PIP103 PIP104 COP1 PIP201 PIP202 COP2 PIP301 PIP302 COP3 PIQ101 PIQ102 PIQ103 COQ1 PIR101 PIR102 COR1 PIR201 PIR202 COR2 PIR301 PIR302 COR3 PIR401 PIR402 COR4 PIR501 PIR502 COR5 PIR601PIR602 COR6 PIU101 PIU103PIU104 PIU105 PIU106COU1 PIU201 PIU202 PIU203 PIU204 COU2 PIP104 PIR102PIP102 PIR402 PIR501 NLDIMMER PILD0AC02 PIP101 PIU104 PIU202 PID101 PIU101 PID102 PIR201 PIR301 PID103 PIU103 PID104 PIP202 PIP301 PILD0AC01 PIR401 PIP201 PIQ102 PIR202 PIR302 PIR601 PIP302 PIQ101 PIQ103 PIU204 PIR502PIU201 PIR602PIU203 PIU106 PIP103 PIR101 PIU105 NLZERO0CROSS