6n135 opto coupler relay driver circuit

I want to operate a relay through optocoupler as shown in the circuit. The ac relay driver circuit we will build is shown below. Driving acdc motors or light level detection are just a few applications. Circuit options explore issues, solutions for relay drivers. Before studying the proposed design, lets first understand how an opto coupler works. An opto coupler is a device which encapsules an led and a phototransistor inside a hermetically sealed, water proof, light proof package in the form of an 8 pin ic resembling a 555 ic. Instead, use it to turn on a driver transistor that has lots of gain like the 2n4401. Notice that for the pnp circuit, a logic 1 to the input of the optocoupler led on turns on power to your load. The opto coupler may not have sufficient ctr current transfer ratio to drive the relay coil. For more on this see mosfet dc relays using photovoltaic drivers. But the circuit shown in figure 2 is completely isolated from.

It is so close, in fact, that one can be wired as a runstop latch circuit. Signals can be transmitted between two electrically separated circuits up to. The output from pin 6 is intended to drive a hexinverter 74ls00n to switch a 5v side of the circuit, the intention to act as a relay switch. Avago technologies optocouplers can be used in an array of isolation applications. This video demonstrates how an optocoupleroptoisolator works. High speed optocoupler, 1 mbd, photodiode with transistor. These simple optocoupler relay driver circuits can be used in variety of electronic projects. Photodiode circuits operation and uses electronics. How to connect a relay through an optocoupler homemade. To see a full in depth article on optocouplers, see. Weve tried several different ics so i dont think its a component fault, unless weve ruined every. The circuit shown in figure 1 will drive the relay through optocoupler in same circuit with same power supply. High speed optocoupler, 1 mbd, photodiode with transistor output description the 6n5 and 6n6 are optocouplers with a gaaias infrared emitting diode, optically coupled with an integrated photo detector which consists of a photo diode and a highspeed transistor in a dip8 plastic package. Optocouplers typically come in a small 4,6, 8 and 16pin ic package.

The phototransistor can be used to switch current in the output circuit. Optocoupler tutorial about how optocouplers and optoisolators use light to. Guidelines for printed circuit board assembly and layout. Signals can be transmitted between two electrically separated circuits up to frequencies of 2 mhz. The 6n5 and 6n6 are optocouplers with a gaaias infrared emitting diode, optically coupled with an integrated photo detector which consists of a photo diode and a highspeed transistor in a dip8 plastic package. Applications ac mains detection reed relay driving switch mode power supply feedback. It can switch at a speed of 1 mbits with bandwidth of 2mhz.

We, again, feed the ac relay the ac voltage it is rated for. Another variation of the circuit is below, and does not have the reverse logic situation. Inverter design using gate drive and current sense optocouplers 56. Few realize how close an optical coupler resembles a relay. It is ttl compatible with open collector output commonly used in power supply circuits like inverter or in data transfer circuits as logic isolators. The 6n5 and 6n6 are optocouplers with a gaaias infrared emitting diode. I want to use raspberry pi gpio pins to control a few relays. Hello readers, we frequently add new circuit diagrams, so do not forget to come back. Relays can of course provide this kind of isolation,but even small relays tend to be fairly bulky. Weve tried several different ics so i dont think its a component fault, unless weve ruined every one that went in the circuit. Tlp310xa high current photo relays in 6pin sop package for factory automation and. Isolated outputs with an isolation voltage range of to 5000v can be provided simply by adding additional optical couplers. The wellestablished relay driving circuit uses an optocoupler to isolate the grounds and noise coupling between the lowvoltage digitalcontrol signal circuit left and the relay as load right.

On the npn circuit, a logic zero 0 to the optocoupler led is required to turn on your load. The 6n5 is a high speed optocoupler with transistor output. One advantage over the relay is that it may be turned off via a normally open contact. Buy 6n5 high speed optocoupler online at lowest price in india with best quality only on.

In other words, it will behave like the pnp circuit. As shown in the following circuit diagram, the relay driver may consist a npn transistor or a pnp transistor. On the relay driver, you do show the clamp diode across the phototransistor it should go across the relay coil. To see a full indepth article on optocouplers, see.