Onboard Charger (OBC)¶

Overview¶

The onboard charger is integrated into the electric vehicle and converts AC grid power to DC for battery charging. Modern OBCs feature bidirectional operation for vehicle-to-grid (V2G) capability.

Difficulty: Advanced

Status: Placeholder

Specifications¶

Parameter	Value	Unit
Input Voltage	85-265 (1φ), 340-530 (3φ)	VAC
Output Voltage	250-450 (400V) or 500-920 (800V)	VDC
Output Power	11-22	kW
Power Factor	>0.99	-
Efficiency	>94% (peak >96%)	-
Power Density	>2.5	kW/L

Topology Options¶

Option 1: Totem-Pole PFC + LLC¶

AC ─[EMI]─[Totem-Pole PFC]─[DC Link]─[LLC Resonant]─ DC

- High efficiency (>96%) - Soft switching - Unidirectional

Option 2: Vienna Rectifier + DAB¶

3φ AC ─[EMI]─[Vienna Rectifier]─[DC Link]─[DAB]─ DC

- Three-phase input - Bidirectional capable - Higher power density

Option 3: Integrated Charger (Motor Windings)¶

AC ─── Motor Windings (as filter) ─── Inverter (as rectifier) ─── Battery

- Uses traction components - Lower cost - Reduced power

Key Features¶

Feature	Implementation
Wide input range	Boost PFC (universal input)
Isolation	HF transformer (LLC/DAB)
Bidirectional	DAB or CLLC topology
Thermal management	Liquid cooling

Control Architecture¶

┌─────────────────────────────────────────────────┐
│  CAN/LIN Interface ◄─── Vehicle ECU            │
└─────────────────┬───────────────────────────────┘
                  │
┌─────────────────▼───────────────────────────────┐
│  Charge Control (CC/CV profile, battery SOC)    │
└─────────────────┬───────────────────────────────┘
                  │
┌─────────────────▼────────┬──────────────────────┐
│  PFC Control             │  DC-DC Control       │
│  (Vbus, PF, THD)         │  (Vbat, Ibat)        │
└──────────────────────────┴──────────────────────┘

Circuit Files¶

Status: Placeholder - obc_pfc_stage.ipes - Totem-pole PFC - obc_llc_stage.ipes - LLC converter - obc_complete.ipes - Full OBC system

Placeholder - Details to be added