Thursday, March 17, 2016

Circuit Schematic 50ua Current Drives Solid State Relay

Robometricschool. - This is circuit schematic of  50ua Current Drives Solid State Relay like in Figure 1 below. With this article we will give you global description about this electronic circuit schematic and also some component parts of this 50ua Current Drives Solid State Relay.

Circuit Schematics

Component Parts
  1. Bridge Diode
  2. Resistors
  3. Capacitors
  4. See all components above

Electronic circuit schematic like in Figure 1 above is  Circuit Schematic 50ua Current Drives Solid State Relay. According Discovercircuits site describe that most solid state relays require at least 5ma and often more input control current, to fully turn on the device. But such current levels often force battery powered circuits to use excessively large batteries.

The relay hobby circuit shown below demands only 50uA of input current.  This about 100 times lower than that needed by a typical optically isolated solid state relays.  The circuit uses a combination of a high current triac and a very sensitive low current SCR, to control up to 600 watts of power to a load, while providing full isolation and transient protection.

At the heart of the circuit is a Darlington type opto-isolator A1 from NEC.  This device needs only 50uA of current through the LED section to activate the Darlington side.  A bridge rectifier and a couple capacitors, strips off a bit of current from the 120vac line, through the load.  A zener diode limits the generated DC voltage to 8v.  When the opto-isolator is turned on, current is routed to the gate of a sensitive SCR.  When turned on, the SCR routes current pulses to the main control triac, through a bridge rectifier.  A 15v zener delays the trigger point of the triac slightly, so a minimum 30 volts peak to peak is always available to maintain current to the SCR circuit. . 

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