SWITCH MODE POWER SUPPLY TRAINER MODULES

2.SINGLE & MULTIPLE OUTPUT SMPS TRIANER [VSMPS-02]

           Switch mode power supplies (SMPS) become an integral part of computers, Electronics equipments, TV's and etc. It is extensively used in latest IBM compatible computers, which forces the Engineers to understand it thoroughly. In order to understand the SMPS technically, Vi Microsystems has introduced a Single & Multiple output SMPS Trainer module. The detailed specifications of this trainer is as follows..

This module consists of three separate sections,

                                     a. Input Power module

               Input power module is provided with one Auto Transformer and a 230V/24 volt transformer to provide 0-24Volt AC output to the DC-DC converter module.

  One single phase auto transformer provided to vary the input voltage and applied to the transformer input, so that, the transformer output will vary from 0-24Volt

  1 No. of 230/24V, 3Amp transformer provided for output isolation

  One No. of 0-30V AC Voltmeter provided to indicate output voltage

  One Illuminated rocker switch is provided to ON/OFF input power

  One fuse is provided to avoid over current.

  One pilot lamp provided to indicate power ON/OFF

  All outputs, auto transformer, voltmeter mounted on a screen printed PCB with nice cabinet

  Input 0-230V AC

  Output 0-24V AC/3Amps variable, Isolated

b. DC-DC Converter Module [VSMPS-02#SM2]                                                    [TOC]

  TL494 based PWM controller IC operated at 63 KHz. (approximately)

  IRF540/840 used as a power switch with suitable heat sink

  Provision for selection of single output or multi output by means of SPDT Switch

  Pulse is isolated by means of opto-coupler

  Output is filtered by LC Filter

  All input, outputs are terminated by banana sockets

  Necessary test points are provided on the board

  Various fault analysis switches provided to study SMPS controller

  One potentiometer is provided to vary the frequency of PWM (External mode of operation)

  One potentiometer is provided to vary the reference voltage of PWM controller IC.

  Input : 0-24V AC/ 3 Amps (or) 0-24Volt DC /3Amps.(Externaly given from other source)

  Output (Multiple) : +5V/3Amp, +12V/0.5Amp, -12V/0.5Amp

  Output (Single) : +5V/1Amps ; selected by means of a SPDT Switches

  Protection for output short circuit condition.

c. Electronic Load [VSMPS-02#SM3]                                                                   [TOC]

        A PWM Generator, a static switch & a fixed load resistor form the Electronics Load. By varying the PWM Width, load current is varied.

  It consists of one no. of 20-0-20V DC Voltmeter to measure SMPS output voltages

  One Ammeter 0-3A provided to indicate load current

  One multi turn potentiometer is provided to vary the PWM width which in term vary the load current

  Input Voltage : +5V & 12 Volt

  Maximum Load current : 2.5Amps for 5 volt & 0.5 Amps for 12 Volt.

  Input banana connectors and all meters are mounted on a screen printed PCB with nice cabinet.

Suggested Experiments :

  Study of SMPS with single output (+5V).

  Study of SMPS with multi output (+5V, +12V, -12V).

  Study of SMPS with single output under line regulation (Input voltage varied condition).

  Study of SMPS with multi output under line regulation (Input voltage varied condition).

  Study of SMPS with single output under load regulation (Max. 1Amp).

  Study of SMPS with multi output under load regulation (Max. 3Amp).

  Study of Various fault analysis of PWM controller.

      # Feedback < actual feedback.

      # Feedback > actual feedback.

      # Feedback = Zero.

Study of different reference voltage of controller IC.

Study of Controller IC with different frequency.