2 layers249 × 180.3 mm
Kicad snapshot step16 rev a layout complete 20260324 150352
jgrano/Nx-PCBA
Install all of these before opening the project:
91 parts
2 layers138.5 × 108.5 mm
Buck boost
IPrometheusI/buck-boostCargador solar buck-boost no inversor con control CC-CV en ESP32, simulación MATLAB/Simulink y diseño PCB en KiCad.
- Size
- 138.5 × 108.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 32
- Nets
- 41
- Pads
- 103
- Tracks, vias
- 162, 8
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 1 Aug 2026
- Updated
- 3 Aug 2026
Overview
Buck boost is an open-source printed circuit board by IPrometheusI, from the IPrometheusI/buck-boost repository on GitHub, published under the MIT licence. It is a 2-layer board of 138.5 × 108.5 mm with 32 parts on 41 nets, routed with 162 tracks and 8 vias.
It is built around the ADS1115, AP2112K-3.3TRG1 and IRLZ44N, with the SS34, AO3401A and ECA-1HHG471B among its other parts. Its parts include 7 resistors, 5 capacitors, 3 diodes, 3 transistors and 3 connectors. It belongs with the power boards and the ESP32 boards of this library.
Main components
7ADS1115
UncategorisedTexas Instruments
AP2112K-3.3TRG1
SOT-25-5-40℃~+85℃@(Ta) 1 250mV@(600mA) 3.3V 50uVrms 55uA 600mA 65dB@(1kHz) 6V Fixed Over Current Protection、Thermal Shutdown、Enable control Positive SOT-25-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
IRLZ44N
TO-22055V 47A N-Channel HEXFET® Power MOSFETInfineon TechnologiesUncategorised
SS34
SMA(DO-214AC)-55℃~+125℃ 3A 40V 500uA@40V 550mV@3A Independent SMA(DO-214AC) Schottky Diodes ROHSMDDSchottky Diodes
AO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsECA-1HHG471B
插件,D10xL20mm-55℃~+105℃ 10mm 2000hrs@105℃ 20mm 470uF 50V 530mA@120Hz 5mm ±20% 插件,D10xL20mm Aluminum Electrolytic Capacitors - Leaded ROHSPanasonicAluminum Electrolytic Capacitors - Leaded
WP59SURKSGW
插件,D=5mm-40℃~+85℃ 1.95V、2.2V 20mA 30° 565nm、650nm 568nm、630nm 60mcd、1.2cd Common Cathode Red, Emerald Green White Lens 插件,D=5mm LED Indication - Discrete ROHSKingbrightLED Indication - Discrete
README
README.mdCargador Solar Buck-Boost para Vehículos Eléctricos
Cargador de baterías Li-ion utilizando un convertidor DC/DC Buck-Boost no inversor alimentado por un panel solar de 6W, con control CC-CV (Corriente Constante -- Voltaje Constante) implementado en un ESP32.
Especificaciones
| Parámetro | Valor |
|---|---|
| Batería | Li-ion 3.7V / 6000mAh |
| Voltaje de carga máximo | 4.2V |
| Corriente de carga (CC) | ~1.0A promedio |
| Panel solar | 6V / 6W, Vmpp real ~5.5V |
| Inductor | Bourns 1140-102K-RC, 1mH |
| Capacitor | Panasonic ECA-1HHG471B, 470uF/50V |
| Frecuencia PWM | 30kHz |
| Microcontrolador | ESP32-DevKit V1 |
| ADC externo | ADS1115 (16-bit, I2C) |
| Rshunt | 10mOhm (ROHM GMR100HJBFA10L0) |
Topología
El convertidor utiliza una topología buck-boost no inversora con dos MOSFETs (Q1, Q2) y dos diodos Schottky (D1, D2), manteniendo la polaridad positiva en la salida para conectar la batería directamente.
La relación de conversión ideal es:
$$V_{out} = V_{in} \cdot \frac{D}{1 - D}$$
Control CC-CV
El algoritmo de carga opera en tres modos con prioridad descendente:
- Proteccion: si V_panel < 2.0V, mantiene D_min = 0.05.
- Voltaje Constante (CV): cuando V_bat >= 4.2V, reduce D agresivamente (2x step).
- Corriente Constante (CC): ajusta D para mantener I_carga ~1.0A promedio.
La corriente se mide con una resistencia shunt de 10mOhm y el ADS1115 en modo diferencial (resolucion ~0.78 mA/bit).
Simulacion (Simscape Electrical)
El modelo en Simulink utiliza datos reales de irradiancia solar (779 muestras, 9 mayo 2024) y emula el controlador CC-CV del ESP32.
Resultados
- Corriente de carga regulada a ~1.0A promedio (condiciones ideales)
- Duty cycle estable en ~0.535 para Vin ~5.14V
- Voltaje de salida ~3.81V, sin exceder 4.2V
- Convergencia desde D_min en ~4.85s
Diseno PCB (KiCad)
Esquematico
PCB Layout
Vista 3D
Requisitos de simulacion
- MATLAB R2024a+
- Simulink
- Simscape + Simscape Electrical
Autores
- Maickol Andres Fernandez Obando
- Jordi Perez Barquero
- Pablo Jose Navarro Robles
- Vladimir Gonzales Morera
Instituto Tecnologico de Costa Rica -- I Semestre 2024
Licencia
Este proyecto esta bajo la Licencia MIT.
Parts
32| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | ERJ-PC3B1002V | Samacsys:ERJPC3D9763V | R1, R2, R3_10k1, R4_10k1 |
| 4 | MountingHole_3.2mm_M3 | MountingHole:MountingHole_3.2mm_M3 | REF1, REF2, REF3, REF4 |
| 4 | ~ | 1_KiCad_Personal_Lib:CeramicCapacitor | C2_100n1, C3_100n1, C4_10u1, C5_10u1 |
| 2 | 330 | 1_KiCad_Personal_Lib:ResistorThroughHole | R5, R6 |
| 2 | IRLZ44N | Package_TO_SOT_THT:TO-220-3_Vertical | Q1, Q2 |
| 2 | LOGO | LOGO | G***, G1 |
| 2 | SS34 | Diode_SMD:D_SMA | D1, D2 |
| 1 | 100k | 1_KiCad_Personal_Lib:ResistorThroughHole | R7 |
| 1 | 10m | Samacsys:GMR100HJBFA10L0 | Rshunt1 |
| 1 | 1140-102K-RC-1mH | 2_Samacsys_V2:1140102KRC | L1 |
| 1 | ADS1115 | 1_KiCad_Personal_Lib:ADC-4CH-ADS1115 | U1 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q3 |
| 1 | AP2112K-3.3TRG1 | 2_Samacsys_V2:SOT95P285X140-5N | IC1 |
| 1 | Bat | 1_KiCad_Personal_Lib:SCREWTERMINAL-3.5MM-2 | J2 |
| 1 | Battery_Holder | Battery:BatteryHolder_MPD_BH-18650-PC | J3 |
| 1 | ECA-1HHG471B | Samacsys:CAPPRD500W65D1000H2200 | C1_470u1 |
| 1 | ESP32 | 1_KiCad_Personal_Lib:ESP32-DEVKITV1_ESP32-DEVKITV1 | I1 |
| 1 | Panel | 1_KiCad_Personal_Lib:SCREWTERMINAL-3.5MM-2 | J1 |
| 1 | WP59SURKSGW | Samacsys:WP59EGC | LED2 |
Questions
How big is the Buck boost PCB?
It measures 138.5 × 108.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Buck boost use?
32 parts, built around the ADS1115, AP2112K-3.3TRG1, IRLZ44N and SS34. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Buck boost KiCad files?
From the IPrometheusI/buck-boost repository on GitHub, at the commit this page was made from: the board is KiCad/BuckBoost/BuckBoost.kicad_pcb and its schematic KiCad/BuckBoost/BuckBoost.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Buck boost design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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