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How to create a DPDT solid state relay?
As the OP said, it is very difficult to find DPDT SSR (solid state relays). But there are a some ways around this; use two SPDT relays, like this one, or use one DPST-NO and one DPST-NC as proposed in another answer, or finally, use two DPST, with an inverter in front of the control for the second relay.
What are the status of the SPDT switch?
According to the GPout signal, there will be three status of the SPDT solid state relay: 1. When a low voltage level is generated in the input terminal, D2 will be turned off, and D1 will be turned on, and TRIAC1 will conduct, then the CIRCUIT1 will be closed, finally the LOAD1 will be switched on.
Can a MOSFET pair be used for a SPDT switch?
With an n- and p-channel MOSFET, you can easily implement a single-pole double-throw (SPDT) switch to isolate part of a circuit and power it from a secondary supply for standby operation while the rest of the circuit is off (Figure 1). By using a complementary pair, you can use a single control input for the MOSFETs.
How is the SPDT switch connected to the NC throw circuit?
1.2 How does SPDT Switch work 1 BBM (Break Before Make) SPDT Switch By default, the pole of the BBM SPDT switch is connected to NC throw circuit and… 2 MBB (Make Before Break) SPDT Switch More
What is the circuit diagram of a SPDT switch?
The common circuit diagram of the push-pull SPDT SSR relay as shown below (as shown in Figure 7). The push-pull type SPDT SSR switch consists of two LEDs ( D1, D2 ), and two Photo-TRIACs ( TRIAC1, TRIAC2 ). D1 and TRIAC1 form the CIRCUIT1, and D2 and TRIAC2 form the CIRCUIT2.
How many SSRs do you need for DPDT relay?
You could combine multiple SSRs to do this. Two form B and two form A will give you a DPDT SSR. Cost would be fairly high (about $20 in singles) but this is really a weird set of requirements. Switching will be slow. For example, two LCB710 and two CLA230 (IXYS) would handle 700mA.
How is opto coupler used in solid state relay?
Besides, the opto-coupler (with optoelectronic isolation feature) is used in the normal solid state relay as the signal transmission component, so the input control circuit of the SSR switch is electrical insulated to its output circuit.