12 WATT SMPS SOLUTION

Specifications
Of
Item Name:     SMPS 12V @ 1A
Item Code:  09A
switched-mode power supply (SMPS) (SMPS 12V @ 1A) is an electronic power supply unit (PSU) that incorporates a switching regulator. The salient features are enlisted below:

Input:     170 to 265 VAC ; 47 - 53 Hz, L N 

Output:     12V @ 1A
Line and Load Regulation:    1 %
Output Ripple:  1%,
Operating Temperature:    -10 to 50 deg C ; RH 95 % non condensing
Output Isolation:    1.5 KV rms @ 50 Hz for 1 minute.
Other Features:    
Output short circuit protection • Input EMI-RFI filters • Screw type input / output connectors • Output LED indication • Integrated MOSFET and PWM controllers for greater reliability and space saving

Efficiency:  >74 % at full load and normal I/P
Stand by power: <1.12
Output variation: Apprx. ±5% through preset.

SCHEMATIC FOR 12V 1A

COMPONENT  DETAIL

TRANSFORMER DETAIL'S

PCB DRAWING

     TESTING PROCEDURE:

      RATING:  I/P:170V~265VAC,  O/P: 12V--1A       
      A) VISUAL CHECKING

     CHECK DRY SOLDERING  CHECK POLARITY OF COMPONENT.
      B) ELECTRICAL TEST

1. Connect the input and output, make sure the Line Neutral Earth at CN1 is OK and +Ve, -Ve at output is proper on your zic without Load and adjust the variac for 170V.

2.  Switch on the psu and see the operation  as follows:

            (a). Bulb in series with a little glow. 

            (b). Output voltmeter show voltage 12V ±1%.

            (c). If the AC ampere meter is on your zic, check the current in mA is showing.

            (d). Output  LED indication is Green.

3. Bypass the bulb and increase the load gradually to the maximum (1A) [make sure that your load resistance is proper] see the voltage regulation is ok (±1% is recommended) and increase  the input voltage up to 265Vac and confirm that line regulation is maintaining [±1% recommended ].                                                                                             

4. Switch ON and OFF the power supply many times with full load, both at low ac input [170V] and high ac input[265V]. make sure every time working properly.

5.Increase the Ac volt up to 280v and see the shutdown in between 280v and 290v and Decrease the voltage 265V and see restarting.

  

SWITCH MODE POWER SUPPLY

A switched-mode power supply (switching-mode power supply, SMPS, or simply switcher) is an electronic power supply that incorporates a switching regulator in order to be highly efficient in the conversion of electrical power. Like other types of power supplies, an SMPS transfers power from a source like the electrical power grid to a load (e.g., a personal computer) while converting voltage and current characteristics. An SMPS is usually employed to efficiently provide a regulated output voltage, typically at a level different from the input voltage. Unlike a linear power supply, the pass transistor of a switching mode supply switches very quickly (typically between 50 kHz and 1 MHz) between full-on and full-off states, which minimizes wasted energy. Voltage regulation is provided by varying the ratio of on to off time. In contrast, a linear power supply must dissipate the excess voltage to regulate the output. This higher efficiency is the chief advantage of a switched-mode power supply.
Switching regulators are used as replacements for the linear regulators when higher efficiency, smaller size or lighter weight are required. They are, however, more complicated, their switching currents can cause electrical noise problems if not carefully suppressed, and simple designs may have a poor power factor

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How to manufacture SMPS at small scale (home base production)

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