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
How this product is typically engineered
A representative low-voltage wearable controller for regulated knee warming, vibration levels, timed sessions, battery charging, and compact numeric indication.
System architecture
Typical architecture
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 resolve
Decisions to close 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
Checks to define 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.
What to put in the RFQ
Files and records to agree before quoting
Use this list to agree the build inputs and release records for a similar product. The final set depends on the project.
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.
During RFQ review, we confirm the required fields, sampling, limits, approvals, and record-retention period. Confidential project information stays within the agreed access rules.
Development and production controls
Typical manufacturing scope
- 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.
