Electronic load 12v 15A - EasyEDA open source hardware lab

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

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

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PCB

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PCB_Electronic load 12v 30A
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BOM

BOM download Purchase Parts

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-5.055.05H 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