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Std edition Electronic load 12v 15A

Profile:Precision electronic load to discharge, test batteries or power modules.

License: Public Domain

Published Time: 2022-09-04 23:19:01
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Description

Microcontroller hold down the commanded current through full diapazone of temperature and voltage. Also controlled the fan RPM, reduce the current if fan can't cold radiator.
Microcontroller send through UART measured parameters and receive from UART commanded current.
Minimal foolproof.

Design Drawing
schematic diagram
1 /
PCB
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Empty
ID Name Designator Footprint Quantity
1 1uF C1,C7,C14,C28,C29 C0603 5
2 100nF C2,C3,C4,C5,C6,C8,C9,C10,C11,C12,C13,C16,C18,C19,C20,C21,C22,C23,C24,C26,C27 C0603 21
3 10uF C15,C17 C0603 2
4 10uF C25 C1206 1
5 1N5819 D4 SOD-323_L1.8-W1.3-LS2.5-RD 1
6 ICSP J1 ICSP 1
7 Fan J4 HDR-M-2.54_1X2 1
8 IRFZ44 Q1,Q2,Q3,Q4,Q5,Q6,Q7,Q8 TO-220 HOR 8
9 2N7002 Q10 SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR 1
10 MTD3055EL Q11 TO-252-2_L6.6-W6.1-P4.58-LS9.9-BR 1
11 1k R1,R7,R8,R9,R10,R12,R13,R14,R15,R16,R17,R18,R19,R20,R25,R26,R27,R28,R29,R30,R31,R32,R33,R34,R35,R36 R0603 26
12 220k R3,R4,R5,R6,R21,R22,R23,R24,R39,R44,R49 R0603 11
13 8k2 % R11,R40,R43,R45,R48,R50 R0603 6
14 10k 3950 Al R37 NTC MF58_DO-35 1
15 3k3 % R38 R0603 1
16 0.006 R41 CURRENT SHUNT 1225 1
17 43k % R42,R47,R51 R0603 3
18 10 R46 R0603 1
19 330 RN1 RES-ARRAY-SMD_0402-8P-L2.0-W1.0-BL 1
20 OLED_0.96 U3 OLED_0.96 1
21 PIC24FJ16GA002-IML U4 QFN-ML28 1
22 INA199A1 U5 SC-70-6_L2.2-W1.3-P0.65-LS2.1-BR 1
23 SPX5205M5-3.3 U6 SOT-23-5_L3.0-W1.7-P0.95-LS2.8-TL 1
24 TactBtn U7,U8,U9 KEY-TACT-SMD-5.05*5.05*H COPY 3
25 AT78L05 U10 SOT-89-3_L4.5-W2.5-P1.50-LS4.0-BR 1
26 24C02 U15 SOIC-8_L5.0-W4.0-P1.27-LS6.0-BL 1
27 micro USBFemale USB1 MICRO-USB-SMD_5P-P0.65-H-F_C10418 1
28 LM224 U1,U2 SOIC-14_L8.7-W3.9-P1.27-LS6.0-BL 2

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Project Attachments
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ElLoad_En.mp4

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