P701 opto coupler relay driver circuit

Circuit options explore issues, solutions for relay drivers. Optocoupler tutorial about how optocouplers and optoisolators use light to. Im wanting to control two 12v relays by means of an npn transistor, and will. Therefore the mounting area can be reduced in equipment requiring safety standard certification. The opto coupler may not have sufficient ctr current transfer ratio to drive the relay coil. Driving an electromechanical relay from a lowvoltage digital io line is a common situation, but there are. How to make an 8 channel relay driver board optically isolated. Figure 14 shows how to interface two ttl circuits, using an optocoupler circuit that provides a noninverting action. These simple optocoupler relay driver circuits can be used in variety of electronic projects.

The p701 is 50% smaller than the 8pin dip and meets the reinforced insulation class requirements of international safety standards. Review ac relay circuits optocouplers triacs youtube. The widely accepted method for galvanic isolation is the use of optical isolator optocouplerphotocoupler. How to connect a relay through an optocoupler homemade. The phototransistor can be used to switch current in the output circuit. The question was asked by one of the interested members of this blog, miss. Typical relay current driver circuit use an optocoupler connected to a transistor which then drives the relay. On the relay driver, you do show the clamp diode across the phototransistor it should go across the relay coil.

In this project, we will show how to connect an optocoupler chip to a circuit. For demonstrating the working of this relay module, we have used. Here we have used 12v 10amp relay in this pcb board, but you can also use 5v relays. This is more than enough current to drive the transistor and switch the relay on. As shown in the following circuit diagram, the relay driver may consist a npn transistor or a pnp transistor. I used pc 817 optocoupler to drive 60 volts dc light with arduino for colour switching i given 5volts power supply for optocoupler and other side i connected input and load but it was directly switched without given any input in arduino please give any. Driving relay directly from optocoupler, what is best. The wellestablished relaydriving circuit uses an optocoupler to isolate the grounds and noise coupling between the lowvoltage digitalcontrol signal circuit. The following post describes how to drive a relay by using an isolated method, or through an optocoupler device. Instead, use it to turn on a driver transistor that has lots of gain like the 2n4401.

The p701 is suitable for gate driving circuits for igbts or power mosfets. Here, the optocoupler led and currentlimiting resistor r1 are connected between the 5v positive supply rail and the outputdriving terminal of the ttl device rather than between the ttl output and ground, because ttl outputs. In this 4channel relay driver circuit we have used an optocoupler whic his triggered by active low signal, to trigger the npn transistor which further drives the relay. The circuit shown in figure 1 will drive the relay through optocoupler in same circuit with same power supply. An optocoupler or optoisolator chip is a chip that allows for electrical isolation between the input of the circuit and the output of the circuit.