AC switching

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Druggan

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I have two inductive loads C1 & C2. While C1 is passively connected to an A/C outlet (230 V, 50 Hz), C2 will be switched on demand as per Figures 1 & 2, hereto referred as State 1 and State 2. A suitable signal may be used to trigger the switch gates, say -5 V for State 1 and +5 V for State 2 (to be determined by the designer). The switching frequency may be from zero to say 400 Hz. The maximum operating amperage is 2 A.
 

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Solution
Principle circuit function seems clear, you are apparently asking for implementation suggestions.
2 A max. is a job for MOSFET switches, to reduce gate driver effort, photovoltaic opto couplers like VOM1271 might be interesting. Exact dead-time control will be an issue, I'd suggest to add TVS diodes or RCD snubber to clamp turn-off spikes.
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freewheeling looks interesting
don't think you need switch 5
balance the freewheeling - half the time on one side, as you marked it, half the time on the other side
helps balance the use of the switches and the heating thereof
 

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freewheeling looks interesting
don't think you need switch 5
balance the freewheeling - half the time on one side, as you marked it, half the time on the other side
helps balance the use of the switches and the heating thereof
 

Upvote 0 Downvote
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