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Design Notes
Finalized 2 kW / 100 kHz Power Stage
- Topology locked as 2-phase interleaved asynchronous boost.
- Operating target: 20 V to 40 V turbine input, 48 V charge bus, 2 kW output, 100 kHz PWM per phase.
- Input current range used for sizing: 50 A at 40 V up to 100 A at 20 V.
- Per-phase average input current target: about 25 A to 50 A.
- Duty cycle range: about 0.545 at 40 V input to about 0.706 at 20 V input.
- Ripple target used for magnetics sizing: about 20 percent worst-case per-phase current ripple.
Calculated targets
- Per-phase ripple current target worst case: 10 A at 20 V input.
- Required inductance for 10 A ripple at 20 V, D = 0.706, f = 100 kHz: about 14.1 uH.
- Required inductance for 5 A ripple at 40 V, D = 0.545, f = 100 kHz: about 43.6 uH.
- Final nominal design value chosen: 15 uH per phase as the practical compromise, accepting lower ripple at high line and about 9.4 A ripple worst case at low line.
- Estimated MOSFET current for loss sizing: about 25 A RMS per phase worst practical operating point.
- Conduction loss estimate with 12 mOhm class MOSFET: about 7.5 W per MOSFET.
- Added switching-loss allowance with 65 nC class gate charge and 30 ns edge estimate: about 0.12 W, so the selection remains conduction-loss dominated.
- Output capacitance target from ripple sizing alone is modest, but bulk was increased for transient energy storage and battery-current smoothing.
Final component decisions
- Q1 and Q2: replace 650 V placeholders with 100 V-class low-Rds(on) MOSFETs. Selected library part: NCEP0178AK.
- L1 and L2: set to 15 uH nominal target, >=40 A saturation and current-rating intent, very low DCR magnetics required.
- C13: 470 uF / 50 V input bulk.
- C17 and C18: 10 uF / 50 V high-frequency input bypass MLCCs.
- C14: 470 uF / 63 V output bulk.
- C15 and C16: 2.2 uF / 100 V switch-loop bypass capacitors.
- C19: 4.7 uF / 100 V fast output bypass.
- R7 and R8: 3.3 ohm gate resistors as initial efficiency-oriented value.
Integration notes
- Existing U6 dual isolated driver remains the preferred 100 kHz gate driver.
- U5 fast overcurrent trip path to U6 DIS remains preserved.
- U3 and U4 current-sense amplifiers remain tied to the shunt architecture.
- Existing ADC voltage sensing and filtered fault-monitor path remain unchanged.
Open validation items
- Flux library did not contain a strong direct 15 uH / 40 A single inductor match, so L1 and L2 remain generic inductors with finalized electrical targets.
- Thermal validation required for MOSFET copper area and heatsinking because about 7 W to 8 W per switch is expected near worst case.
- Simulate one phase and then the full 2-phase averaged system for current ripple, bus ripple, and duty-cycle margin.
- Layout must keep the Q-D-L-D-C hot loops compact and use wide copper or pours for turbine and charge-current paths.
System Requirements
- Input source: wind turbine rectified DC bus, 20-40 V, up to 2000 W
- Output target: charge a 48 V power bank
- Required functions:
- Step-up conversion from turbine bus to battery charging bus
- Intelligent load selection based on turbine operating state
- Startup / cut-in behavior to avoid stalling the turbine
- Active power tracking during normal operation
- Battery-limited operation when the power bank cannot accept more power
- Diversion / protection mode for full-battery or fault conditions
- Overcurrent, overvoltage, thermal, and reverse-flow protection
Chosen Architecture
- High-power synchronous boost converter stage for 20-40 V input to regulated 48 V bus
- MCU-based supervisory control for state machine and load-selection algorithm
- Dedicated current/voltage sensing on turbine input and battery/output path
- Diversion-load control path to absorb excess wind power when charging must stop or be reduced
- Protection stage at turbine input and output, including surge clamp, reverse blocking, and current limiting
Operating Modes
- Startup / cut-in: light load, allow rotor acceleration
- Active tracking: adjust boost demand to maintain efficient turbine operating point
- Battery-limited: obey battery charging limits while maintaining safe turbine loading
- Diversion / protection: route excess power to dump load and protect the turbine / converter
Implementation Notes
- This is a conceptual high-power controller architecture prepared for later detailed simulation and component sizing.
- Because the power level is 2 kW, final component ratings, thermal design, magnetics, and PCB copper geometry must be verified in a later pass.
- A 4-layer layout is the minimum sensible stackup for this design due to high current, multiple power domains, and noise control.
Added Schematic Blocks
- Supervisory MCU: STM32F303CBT6
- Gate driver: IR2110STRPBF
- Current sensing: INA196 on turbine input and charging/output path
- Hardware overcurrent trip: INA200D comparator monitor
- Conceptual power stage: external MOSFET pair, boost inductor, input/output bulk capacitors, current shunts
- ADC monitoring: turbine current, charge current, turbine voltage, battery voltage, fault monitor voltage
- MCU control nets: PWM high, PWM low, gate shutdown, overcurrent fault input
Current Limitations
- The present schematic is a functional block-level controller architecture, not yet a final manufacturable 2 kW converter design.
- The boost switch arrangement, inductor value, compensation network, switching frequency, current-loop design, deadtime, and MOSFET ratings still need dedicated power-stage engineering.
- The battery interface is represented as a generic 48 V charge output rail; exact battery chemistry profile and BMS interaction remain to be defined.
100 kHz Interleaved Refinement
- Topology refined from a single conceptual boost phase into a 2-phase interleaved boost stage.
- Design target remains 20-40 V input, 48 V class battery charging output, 2 kW power transfer, and 100 kHz switching priority with efficiency favored.
- Worst-case input current at 20 V and 93% assumed efficiency is approximately 107.5 A total.
- Estimated battery-side current at 54 V output is approximately 37.0 A.
- A 20% per-phase ripple target gives an initial inductance estimate of roughly 5.9 uH at 20 V input and 9.6 uH at 40 V input, so 8.2 uH per phase is being used as a practical placeholder.
Added Refinement Blocks
- Second interleaved inductor phase: L2
- Dedicated boost rectifiers: D1 and D2
- Stronger dual-channel gate driver for 100 kHz switching: U6
- Gate shaping and default-off network: R7, R8, R9, R10
- Additional high-frequency bypass capacitors on input, output, and driver rails: C15, C16, C17, C18, C19, C20, C21
- Filtered protection telemetry placeholder: R11 and C22
Power-Stage Integration Notes
- L1 and L2 form two boost phases from the turbine input rail.
- Q1 and Q2 are low-side boost switches for the two phases.
- D1 and D2 rectify each phase into the battery-side output rail.
- U6 now provides the preferred high-current gate-drive path for phase A and phase B PWM operation at 100 kHz.
- U5 hardware overcurrent output is wired into the fast gate-disable path so firmware-independent shutdown can inhibit the gate driver.
Layout, EMI, and Thermal Direction
- Use short, tightly contained high-di-dt loops for each phase: input bypass -> inductor -> MOSFET -> ground return.
- Keep each diode, MOSFET, and local bypass capacitor cluster physically compact.
- Route gate-drive traces short and away from current-sense and ADC inputs.
- Maintain dedicated quiet analog ground references for sense amplifiers before joining the power ground.
- Reserve copper area and heatsinking strategy for Q1, Q2, D1, D2, L1, and L2.
Validation Benchmarks
- Efficiency target for later validation: prioritize operation above 93% near nominal power if device selection and magnetics permit.
- Verify dead time, switch-node ringing, and gate-drive overlap at 100 kHz.
- Verify inductor current sharing between phases and confirm no excessive saturation risk.
- Measure output ripple, thermal rise of switches/diodes/inductors, and hardware fault response during overcurrent events.
Finalized 2 kW / 100 kHz Power Stage
Calculated targets
Final component decisions
Integration notes
Open validation items
System Requirements
Chosen Architecture
Operating Modes
Implementation Notes
Added Schematic Blocks
Current Limitations
100 kHz Interleaved Refinement
Added Refinement Blocks
Power-Stage Integration Notes
Layout, EMI, and Thermal Direction
Validation Benchmarks
