Power Electronics Lead - Solid-State Rack Power

QuantumScape Battery, Inc.; San Jose (CA); On-site; USD 155,000 - 237,000; Full time

Benefits offered by this job

Annual bonus

RSU/Equity

Health care

ESPP

Onsite role in CA

Job summary

QuantumScape Battery, Inc. is seeking a Power Electronics Lead to own the complete power conversion architecture for an integrated solid‑state battery–powered rack platform.

You will define topology, select magnets and semiconductors, and drive efficiency and power density targets for a high‑density data center solution. You will collaborate with firmware and battery systems engineers, oversee bring‑up and validation, and mentor a small cross‑functional team in a hands‑on R&D environment.

Qualifications

• 10+ years designing multi‑kW AC‑DC or DC‑DC power converters that shipped in volume.
• Deep expertise in at least two converter topologies (LLC, PSFB, DAB, CLLC, or equivalent).
• Hands‑on magnetics design experience (core selection, winding strategy, loss modeling).
• Experience with digital power control (DSP/MCU‑based compensators).
• Track record in server PSU, telecom rectifier, EV onboard charger, or comparable high‑density power product.
• Proficiency with simulation tools (PLECS, LTspice, PSIM).
• Comfortable leading technical direction and mentoring a small cross‑functional team.

Responsibilities

• Architect the end‑to‑end power conversion topology (AC‑DC front end, intermediate bus, DC‑DC output stage, bidirectional battery converter path).
• Lead topology trade‑off analysis: LLC resonant, phase‑shifted full bridge, hybrid approaches, inline vs. parallel sidecar battery integration.
• Design magnetics (planar transformers, coupled inductors) and select power semiconductors (GaN/SiC FETs, diodes) with thermal derating analysis.
• Define and drive efficiency targets (97%+ titanium‑class at rack load) and power density goals within a lOU or 20U shelf envelope.
• Collaborate closely with firmware/embedded engineer on digital control loop implementation (voltage/current mode compensation, loop bandwidth, phase margin).
• Work with the battery systems engineer to define the charge/discharge power path, voltage window, and current limits for solid‑state cells.
• Design protection circuits (OCP, OVP, OTP, short‑circuit) and define fault response behavior.
• Bring up and validate prototype power stages on the bench, iterating through bringup, thermal characterization, and efficiency optimization.
• Interface with the PCB layout contractor to ensure EMI‑conscious layout, proper creepage/clearance, and power plane integrity.

Skills

Power electronics

AC-DC power conversion

DC-DC converters

GaN/SiC FETs

Topology trade-offs

Magnetics design

Thermal analysis

Digital power control

Prototype bring-up

EMI/layout

Mentoring

Tools

PLECS

LTspice

PSIM

Job description

QuantumScape Battery, Inc. is seeking a Power Electronics Lead to own the complete power conversion architecture for an integrated solid‑state battery–powered rack platform.

You will define topology, select magnets and semiconductors, and drive efficiency and power density targets for a high‑density data center solution. You will collaborate with firmware and battery systems engineers, oversee bring‑up and validation, and mentor a small cross‑functional team in a hands‑on R&D environment.