SMPSU With A Relay

Posted on Feb 5, 2014

Switched mode power supply units (SMPSUs) are popular but difficult to build oneself as well problematic when it comes to understanding their design principles. Building your own SMPSU typically requires a lot of expertise, hard to find components and time. The circuit shown here is educational only and devised to demonstrate the principle of the

SMPSU With A Relay
Click here to download the full size of the above Circuit.

step-up switch mode circuits. It is not intended to be incorporated in a real` design. Relay Re1 has a normally-closed (NC) change-over contact and is connected toact as a vibrator. When power is applied to the circuit, the relay is energized and actuates its contact. This action may appear to break the circuit. However, the energy stored in the relay coil will produce an induced voltage which is fed to D1 and C1 for rectification and smoothing. The output voltage will be of the order of 150 V and strongly dependent on the type of relay used. In general, the faster the relay, the higher the output voltage. The circuit will oscillate at a low frequency (100-200 Hz), and a buzzing sound will be heard from the relay.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Subwoofer Equaliser
    FM reciever with LM386
    74LS192 Computer controller 4 DC motors
    Digital Compass Module HMC6352
    LED Drivers/LCD Bias
    Programmable Stiffness Joint
    Electrical Systems and Circuits
    Adjustable High/Low Frequency Sine wave generator
    A high-power DC motor overcurrent protection circuit
    FM modulator strong - weak signal switching circuit
    Three of the five band equalizer circuit transistor