This circuit was "reverse engineered" from a cheap 5V USB charger circuit. Voltage regulation is by a zener diode and opto-isolator coupling the primary and secondary. The circuit includes 4 zener diode models from 2.4 to 5.1V
The aim of the project was to explore how SMPSs operate These are good primers http://mmcircuit.com/understand-rcc-smps/ http://www.ecircuitcenter.com/Circuits/smps_buck/smps_buck.htm
Experiment with changing Bf, Rload, Lpri . . .
Similar circuits are http://i.stack.imgur.com/i99WG.png http://www.next.gr/uploads/79/201142264630267.gif http://www.seekic.com/uploadfile/ic-circuit/s20113302203978.gif
| ID | Designator | Quantity |
|---|---|---|
| 1 | L1 | 1 |
| 2 | L3,L2 | 2 |
| 3 | C1 | 1 |
| 4 | B1 | 1 |
| 5 | R1,R8,R10 | 3 |
| 6 | C2,C3,C7 | 3 |
| 7 | VIFILT,VIFILT2,VIFILT3 | 3 |
| 8 | D2 | 1 |
| 9 | R2 | 1 |
| 10 | Q1 | 1 |
| 11 | R4 | 1 |
| 12 | C6 | 1 |
| 13 | C4 | 1 |
| 14 | R5 | 1 |
| 15 | R6,R9 | 2 |
| 16 | V1 | 1 |
| 17 | Q2 | 1 |
| 18 | U1 | 1 |
| 19 | R3,R9,R7,R1,R4 | 5 |
| 20 | C5 | 1 |
| 21 | D1 | 1 |
| 22 | D3 | 1 |
| 23 | B2 | 1 |
| 24 | V2,V3,V4 | 3 |
| 25 | B3 | 1 |
| 26 | S1,S2 | 2 |
| 27 | V5 | 1 |
| 28 | V7,V6 | 2 |
| 29 | R7 | 1 |
| 30 | R11,R13,R6 | 3 |
| 31 | C1 | 1 |
| 32 | C6 | 1 |
| 33 | D3 | 1 |
| 34 | RLOAD | 1 |
| 35 | U1 | 1 |
| 36 | R1,R3,R5 | 3 |
| 37 | R2,R12,R3 | 3 |
| 38 | V1 | 1 |
| 39 | C1 | 1 |
| 40 | RLOAD | 1 |
| 41 | U2 | 1 |
| 42 | R11 | 1 |
| 43 | R2 | 1 |
| 44 | V1 | 1 |
Comments (1)
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