WELL-13 · Wellness Electronics
Heated Vibration Knee Massager Control PCBA
A representative low-voltage wearable controller for regulated knee warming, vibration levels, timed sessions, battery charging, and compact numeric indication.
Project context
A representative engineering program
A representative low-voltage wearable controller for regulated knee warming, vibration levels, timed sessions, battery charging, and compact numeric indication.
System architecture
How the electronics are organized
USB-C charging and battery protection feed an MCU, display, DC/DC stage, vibration-motor output, and heater switch; a skin-side NTC closes the thermal loop and gates fault shutdown.
Engineering risks to close
What must be resolved before release
- Control skin-side temperature despite fit, ambient, and heater-resistance variation.
- Handle simultaneous cold-heater and motor startup without brownout or connector overheating.
- Detect NTC detachment or a shorted heater switch before a local hot spot develops.
Validation plan
Evidence expected before production
- Map multi-point skin-side heat-up time, steady-state temperature, uniformity, and overshoot.
- Simulate NTC open, short, and detachment plus heater-switch short, low battery, and abnormal USB input.
- Run motor-start, charge-use policy, sweat, harness-flex, button, and repeated thermal-cycle tests.
Decision-ready evidence packet
What a comparable RFQ should define
This checklist turns the technical story into reviewable inputs and release records. It describes what buyers and manufacturers should agree—not a claim that every listed record applies to every build.
Design baseline
Released schematic or block diagram, interface table, power states, critical constraints, and revision owner.
Manufacturing release
Gerber or ODB++, stack-up, centroid data, assembly drawings, approved DFM dispositions, and panel assumptions.
Material control
Released BOM revision, manufacturer part numbers, AVL or alternate rules, no-substitute lines, MSL handling, and exception approvals.
Validation record
Test method, acceptance criteria, sample or serial identity, measured result fields, and disposition. Example scope: Map multi-point skin-side heat-up time, steady-state temperature, uniformity, and overshoot.
Production release
First-article status plus the agreed SPI, AOI, X-ray, ICT, FCT, programming, rework, OQA, labeling, and packing records.
Project-specific fields, retention periods, sampling rules, measured limits, and customer approvals are confirmed during RFQ and protected under the applicable confidentiality agreement.
Development and production controls
Manufacturing scope represented here
- Closed-loop wearable heating.
- Vibration PWM and numeric indication.
- USB-C charging and battery supervision.
Technical image review
Board-level evidence
White-background views are published to make component placement, interfaces and assembly boundaries easier to inspect.
