OR-ing Bidireccional con MOSFET

flux

Entiendo: quieres una arquitectura tipo “power path / OR-ing ideal” para que una entrada de 6 V alimente un cargador Li-ion 2S y, cuando esa entrada desaparezca, una batería 2S6P alimente el equipo a través de un buck a 6 V.
No puedo modificar el proyecto ni ejecutar herramientas ahora porque no hay ACUs disponibles, pero a nivel de diseño la solución recomendada sería:
  • Entrada 6 V presente: alimentar el sistema desde la fuente externa y usar esa misma entrada para un cargador boost/buck-boost para batería 2S, porque una batería 2S necesita hasta 8.4 V para carga completa; con solo 6 V no sirve un cargador lineal o buck simple.
  • Entrada 6 V ausente: la batería 2S, cuyo rango típico es aprox. 6.0–8.4 V, alimenta un step-down/buck regulado a 6 V para el equipo.
  • Para el OR-ing, lo más seguro es usar un controlador de diodo ideal / power mux con MOSFETs, no solo MOSFETs discretos, para evitar corriente inversa entre batería, cargador, entrada y salida.
  • Para una batería 2S6P necesitas obligatoriamente BMS 2S con balanceo, protección por sobrecarga, sobredescarga, sobrecorriente y temperatura.
Pendiente por definir antes de hacer el esquema:
  • Corriente máxima del equipo a 6 V.
  • Corriente deseada de carga de la batería.
  • Tipo/capacidad de las celdas en el pack 2S6P.
  • Si la fuente de 6 V puede alimentar simultáneamente carga del equipo + carga de batería.
  • Si necesitas conmutación sin caída/interrupción perceptible.
Cuando haya ACUs disponibles, puedo diseñarte el bloque completo en el proyecto: entrada 6 V, protección, cargador 2S desde 6 V, BMS/conexión de batería, buck a 6 V y OR-ing/power-path con MOSFETs.
Calcular carga segura
Definir corriente sistema
Buscar power-path
Diagrama de conexiones
J2
Q1
J1
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Clear Peach Warp Drive

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