A branded Qi2 programme can open at 200 pieces per model – but only when the magnet array, the coil and the radio documentation already sit on a certified platform. Change any of the three and the programme becomes a development project, with tooling, sample loops and a new test submission behind it. That single distinction separates a Qi2 order that ships in weeks from one that slips a quarter, and it is decided long before the quotation arrives.
Qi2 charger manufacturing: what the magnet array and the power profile decide
Two components decide the product.
The magnet array fixes where the phone sits over the coil, and the power profile defines what the product delivers at that position within the standard. Together they set the charging rate, the heat generated and the customer experience. Every other decision – enclosure, finish, packaging – is built around them, which is why a Qi2 programme is specified around alignment and thermal behaviour rather than around a wattage label.
From an engineering standpoint the two are coupled. Moving the phone closer improves coupling and reduces losses, but a thinner housing reduces the space available for the shield and the thermal path. Strengthening the magnets improves alignment consistency, but the array occupies volume inside the same enclosure and affects the field. A Qi2 design is therefore a set of trade-offs between four measurable quantities: coupling distance, holding force, temperature rise and delivered power.
Magnet array trade-offs: grade, geometry and holding force
Compare arrays on three variables that a datasheet alone will not settle.
The grade sets the field strength available from a given volume and also fixes the temperature above which the magnet loses strength permanently – which matters in a product that runs warm by design. The geometry sets where the field acts, so an array optimised for one phone size can hold a heavier phone poorly. The coating and the adhesive determine whether the array survives handling and heat over the product’s life. None of the three can be validated from a drawing, which is why the holding force has to be measured after assembly, through the housing and the adhesive layer, not on the bare magnet.
Coil coupling: the variable the customer never sees
Coupling is a distance problem before it is an electrical one.
The distance between the charger coil and the device coil is set by the housing thickness, the shield, the coil former, the adhesive and – on the customer’s side – the phone case. Every one of those adds tolerance. The engineering consequence is that a design verified with a bare phone on a laboratory bench can behave differently with a thick case in daily use, and the customer experiences that difference as a charger that is slow rather than as a coupling problem. Ask how the coil was selected, what coupling distance it targets and which cases were used in the verification.
Power profile: what is delivered where the customer uses it
A wattage figure describes the ceiling, not the delivered rate.
What matters is the rate delivered at the alignment the customer actually achieves, which is usually slightly off the nominal centre, and with the case they actually use. Ask for the charging rate measured at the nominal position and at the edge of the alignment tolerance, with the intended device, and ask what the product does as it approaches that edge: does it reduce power, drop the link or continue inefficiently? The behaviour belongs in the specification, because it is what the customer will observe.
Thermal behaviour: the constraint that shapes the enclosure
In a compact Qi2 design, heat – not wattage – decides how small the product can be.
Losses at the coil interface and in the electronics have to leave through a housing that is largely covered by the phone. The relevant measurements are the temperature rise at the interface and at the external surface, taken over a sustained charge, in the shipping enclosure, at a stated ambient temperature. The interface figure governs throttling behaviour; the surface figure governs how the product feels in the hand. Ask for both, and ask what the control system does when each reaches its limit.
What a Qi2 manufacturer must be able to document
Ask for four documents before discussing price.
The radio test report for the platform, naming the model and the markets covered; the coil and magnet specification, including grade, geometry and shield material; the thermal measurement record with its conditions; and the functional test definition, showing whether the production test uses a real device and how the position is fixed. A supplier who can produce all four is describing a characterised product. A supplier who can produce only a wattage and a price is describing a category entry, and the difference will appear in the field.
Assembly control: where a good design becomes a poor product
The magnet array and the coil are positional parts, so their installation is a process control rather than a manual step.
Ask how the coil is located – a moulded pocket, a machined jig or an adhesive fixture – and how the position is verified. Ask how the adhesive cure is controlled, because a partially cured layer allows the assembly to shift after packing. Then ask whether the holding force is checked on finished units or only on a sample. A Qi2 product assembled without positional control can pass a functional test and still deliver an inconsistent experience if the phone sits off centre.
Tooling and MOQ: the certified-platform trade-off
The commercial decision mirrors the engineering one: reuse the certified platform, or pay for a new one.
On an existing platform, a branded run can open at 200 pieces per model, with the enclosure, finish, label and packaging applied; samples with branding are typically prepared in two to three days where the platform allows, and quotations are returned within 24 hours on business days. A new enclosure or a new magnet arrangement carries tooling, sample loops and a certification review, which sets a higher minimum and a longer calendar. Ask the quotation to state which of the two it represents before comparing prices.
How to compare two Qi2 manufacturers on the same terms
| Variable | What to request | Why it decides the programme |
|---|---|---|
| Platform status | Report naming the model and markets | Determines whether the programme needs a new test submission |
| Coupling | Coil specification and intended distance | Sets the delivered rate with real cases |
| Holding force | Measurement after assembly | Determines alignment consistency in use |
| Thermal | Interface and surface rise, sustained charge | Determines throttling and perceived quality |
| Assembly control | Fixtures, cure control, per-unit checks | Determines whether the design survives production |
| Tooling position | Platform route or new tooling | Sets MOQ and lead time |
FAQ
Does a new Qi2 enclosure require new radio certification?
It depends on what changed. Cosmetic changes do not affect the radio assessment. A change in housing thickness, shield or magnet arrangement changes the coupling and the field, and typically requires a review or a new submission. Cosmetic changes do not affect the radio assessment, while a change in housing thickness, shield or magnet arrangement changes the coupling and the field.
How is alignment quality measured?
Charge the intended device at the nominal position and at the edge of the tolerance range, and measure the holding force on assembled units rather than on the bare magnet. Charge the intended device at the nominal position and at the edge of the tolerance range, and measure the holding force on assembled units rather than on the bare magnet array.
What thermal figures should we request?
Interface and surface temperature rise over a sustained charge, in the shipping enclosure, at a stated ambient, with the intended device and case. Ask for the interface and surface temperature rise over a sustained charge, in the shipping enclosure, at a stated ambient, with the intended device and case, because those four conditions decide what the figure means in use.
Can we launch at low volume?
On a certified platform, yes – from 200 pieces per model. A new enclosure or magnet arrangement carries tooling and a higher economic minimum. On a certified platform from 200 pieces per model, while a new enclosure or magnet arrangement carries tooling and a higher economic minimum set by the moulding economics of the die. Ask which line sets the minimum quantity.
What shortens the schedule most?
Choosing a platform whose coil, magnet arrangement and radio reports already cover your configuration. That removes the tooling loops and the certification discovery from the critical path. Choosing a platform whose coil, magnet arrangement and radio reports already cover your configuration removes the tooling loops and the certification discovery from the critical path entirely. It also shortens the quotation cycle, because the market access is already established.
Next step
Send the device set, the intended format and the target markets to Wecent Group through the contact page. The reply states the platform, the coil and magnet specification, the certification position, the minimum quantity and the sample timing. Related reading: wireless charger applications, OEM/ODM manufacturing and quality control. External references: Wireless Power Consortium, FCC equipment authorisation, EU CE marking, IEC standards, ISO 9001 and ECHA REACH.
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