Freelance Project: Advanced High-Voltage Control Motherboard for Imaging System (KiCad / Altium / Proteus) We are seeking a highly experienced Computer/Electronics Engineer with a strong background in high-voltage power systems, embedded control, and PCB

Project Overview The goal is to design and deliver a single-board motherboard (Gerber-ready) powered from a 22V battery source, integrating: * Multi-rail power management * Digital control system * High-voltage generation architecture (conceptual + control side) * Touchscreen UI interface * Precision timing and current control The system will be controlled via a microcontroller (ESP32 or equivalent) and connected to a Windows 11-based mini computer for UI processing. Core System Requirements (High-Level) 1. Power Management Subsystem * Input: 22V battery (approx. 2500 mAh) * Regulated outputs: * 3.3V (MCU & logic) * 5V (peripherals) * 12V (drivers) * 15V (analog/control stages) * Efficient DC-DC topology (buck/isolated as required) * Protection: OVP, OCP, thermal considerations ⸻ 2. Digital Control System * MCU: ESP32 (or equivalent high-performance MCU) * PWM-based control interface for high-voltage driver stage * Adjustable parameters via UI: * Voltage control (scaled control domain) * Current control (low-current precision range) * Timing control (millisecond-level precision) * GPIO-controlled step switching / modulation ⸻ 3. High-Voltage Driver Interface (Control Side Only) * PWM-controlled drive stage (0–12V control signal domain) * Interface to external HV generation stages (flyback + multiplier) * Signal isolation and noise protection critical * Feedback-ready design (voltage/current sensing interface) ⸻ 4. Pre-Heat Control Subsystem (Phase 2) * Controlled warm-up sequence: * Duration: ~60 seconds * 5-step gradual ramp profile * Output target: * ~3V regulated output * Up to ~2.7A current capability * Stable current regulation (closed-loop preferred) ⸻ 5. UI & System Integration * External mini PC (Windows 11) for touchscreen interface * Communication with MCU (UART / USB / SPI preferred) * Real-time parameter adjustment: * Voltage scaling * Current limiting * Exposure timing * Clean API/protocol between UI and control board ⸻ Required Expertise We are looking for candidates with proven experience in: * High-voltage system design (industrial / imaging / similar domains) * Advanced PCB design (multi-layer, noise-sensitive layouts) * Power electronics (DC-DC, PWM control, current regulation) * Embedded systems (ESP32 / STM32 preferred) * Mixed-signal design (analog + digital integration) * EMI/EMC-aware layout practices ⸻ Tools & Deliverables Preferred Tools: * KiCad / Altium Designer / Proteus Deliverables: * Complete schematic design * PCB layout (production-ready) * Gerber files (ready for fabrication) * BOM (with recommended components) * Basic firmware structure (ESP32 control logic) * Documentation (block diagram, design notes) ⸻ Nice to Have * Experience in imaging systems or similar high-voltage applications * Knowledge of safety compliance and isolation design * Experience integrating MCU with Windows-based UI systems * Ability to simulate (Proteus / SPICE) ⸻ Engagement Details * Remote freelance project * Milestone-based delivery * Long-term collaboration opportunity for Phase 2 & system expansion ⸻ How to Apply Please include: * Portfolio of similar projects (especially high-voltage / power systems) * Tools you use (KiCad / Altium / others) * Estimated timeline * Your approach to system architecture ⸻ If you are a serious engineer with real-world experience in advanced power electronics, we want to work with you.

Project ID: 40408243