Custom wireless charger projects fail most often at the very beginning, before any sample exists: the buyer describes a product ("a nice wireless charger for my brand") and the factory builds a generic pad with a logo. The fix is to define the use case first — where the charger lives, what it charges, how it is used — and let the use case drive every structural decision from the coil to the housing. This page is the custom wireless charger workflow, built around the use-case-to-structure method.
Start With the Use Case, Not the Product
The use case is a short paragraph that answers four questions: where does the charger live, what devices does it charge, how many devices at once, and how is it used over a day. A bedside charger that holds a phone overnight has different requirements from a desk charger that holds a phone for video calls, which has different requirements from a travel charger that folds into a bag. The paragraph forces the decisions that the generic brief avoids, and it gives the factory an engineering target instead of a marketing description. Write the use case before contacting any supplier; the factory's response to the use case is the first test of its engineering quality.
The Use-Case-to-Structure Mapping
| Use case | What it implies | Structural decisions |
|---|---|---|
| Bedside, overnight | Low urgency, minimal interaction | Pad or low-profile stand, silent design |
| Desk, video calls | Phone visible and stable | Stand with adjustable viewing angle |
| Multi-device household | Phone + watch + earbuds | 3-in-1 station, power-sharing coils |
| Travel | Folds into a bag | Foldable structure, hinge design |
| Retail / hospitality | Repeated public use | Durable housing, tamper-resistant cable |
Each row is a set of structural decisions, and the decisions are the spec. A project that starts with the use case reaches the structural spec in one conversation; a project that starts with a form factor skips the decisions and inherits them from the factory's catalog.
Coil and Magnet Decisions
The coil is the heart of the wireless charger, and the structural decisions around it are the ones that separate a real product from a logo on a generic module. The coil size and position determine the alignment tolerance; the magnet ring (for magnetic models) determines the pull and the alignment experience; the foreign object detection circuitry determines the safety behavior; and the thermal path around the coil determines the sustained charging performance. The custom project should specify the coil and magnet parameters explicitly — the alignment offset, the pull force, the FOD threshold and the surface temperature limit — rather than accepting whatever module the factory has in stock. The Qi2 and magnetic models in the Wecent range are examples of coil-and-magnet decisions made at the platform level, which a custom project can inherit or override.
Housing, Materials and the Structural Layer
The housing is where the brand meets the engineering, and the structural decisions are about heat, weight and durability. The housing material affects the thermal path — metal conducts heat but adds weight and cost, plastic insulates but can trap it — and the design must balance the surface temperature against the feel. The weight and the base design decide whether a stand stays stable with a phone attached; the hinge (for foldable models) decides the durability of the travel product; the finish decides how the logo and the brand look in the customer's hand. Each structural decision should be written with the test that verifies it: the thermal soak for the housing, the stability test for the stand, the cycle test for the hinge.
Power, Protocol and Compatibility
The electrical layer of a custom wireless charger covers the charging protocol (Qi, Qi2/Magnetic Power Profile), the power target (7.5W, 15W, 25W platforms), the device compatibility (iPhone and Android magnetic alignment, watch and earbuds coils on stations), and the input side (USB-C PD for the power input, or a cable-attached design). The device list from the use case determines the compatibility matrix, and the matrix should be written into the spec so the sample test has a pass/fail list. A custom charger that is "compatible" without a tested device list is a claim, not a spec; the spec lists the devices, the expected power and the test date.
From Spec to Sample: The Custom Timeline
The custom wireless project runs through the same gates as any custom electronics project: spec freeze, electrical sample, structural sample, brand sample, compliance run, pilot batch. The wireless-specific gate is the structural sample, because the coil, the magnet and the housing interact — the housing thickness changes the charging distance, the magnet ring position changes the alignment, and the thermal design changes the sustained power. The structural sample should be tested with the actual devices from the compatibility matrix, at the actual charge positions, with the actual cases, because the difference between the render and the working product is exactly where wireless custom projects live or die. The sample gate should produce a written record of the test results against the matrix, so the compliance run and the production inspection reference the same evidence instead of re-testing by memory.
Common Rework Reasons in Wireless Custom Projects
The rework loops repeat across wireless projects: the housing is approved without the thermal test and the charger throttles; the coil is inherited from the catalog and the phone misaligns; the magnet ring is positioned for the render and the pull is weak; the watch coil is added without its own certification; and the compatibility matrix is written after the sample instead of before it. Each loop is prevented by the same habit: make the use case, the coil-and-magnet decisions and the compatibility matrix part of the spec freeze, and test the structural sample with the real devices before approving it.
Case Testing: The Layer Buyers Forget
Wireless charging is a distance game, and the phone case is the layer that quietly changes the distance. A case that worked with a previous charger can fail with a custom one because the coil position, the magnet strength or the housing thickness shifted the effective charging distance. The custom project's compatibility matrix should therefore include the cases, not just the phones: list the case types your customers use — thin, rugged, magnetic, metal-trimmed — and test the structural sample with them. The two most common wireless field complaints, "it charges slowly" and "it doesn't charge my phone," are frequently case problems that a case-tested spec prevents. Include the case layer in the spec freeze, and the sample gate tests the product the way the customer will actually use it.
Building the Product Page From the Spec
The custom project's spec is also the source of the product page copy, and writing the page from the spec keeps the claims honest. The use case becomes the page's headline scenario; the compatibility matrix becomes the "works with" section with the tested devices and cases; the coil, magnet and thermal decisions become the engineering bullets; and the certification list becomes the compliance section. A product page built from the spec answers the customer's questions with the project's actual decisions, and it prevents the classic custom-product failure of marketing copy that promises what the engineering did not deliver. The page and the spec should be reviewed together at the brand gate, so the story and the product ship as one version.
Bottom Line
The custom wireless charger is a use-case-to-structure project: define where it lives and what it charges, translate the use case into coil, magnet, housing and protocol decisions, and verify the structural sample with the actual devices. The project discipline is the same as any custom electronics project, with the wireless-specific gates at the coil and the housing, and the compatibility matrix written at the spec freeze rather than discovered at the sample test.
To scope a custom wireless project, send Wecent your use case and device list through the contact page; the OEM/ODM service covers the spec freeze through the pilot batch.
Frequently Asked Questions
What information do we need to start a custom wireless charger project?
The use case paragraph, the device list with the compatibility expectations, the target power, the brand requirements and the target markets — five items that form the spec freeze.
How much does custom tooling for the housing cost?
It depends on the housing complexity and the material; the tooling quote is separate from the unit price, and a design that reuses an existing platform avoids most of it.
Can we use our own coil and module design?
Yes, if the design is production-ready and certified; otherwise the factory's engineering team adapts the platform, which is the more common and faster path.
Do custom wireless chargers need wireless-specific certification?
Yes; the certificate should cover the coil, the foreign object detection and the radiated emissions, in addition to the general safety and EMC scope.
How long does a custom wireless charger project take?
For a platform-based project with branding, the timeline is driven by samples and certification; for a new coil or housing design, add tooling and engineering time. The gate schedule in the quote is the answer, and the schedule should name the approval deadlines on the buyer's side as well, because a project with unnamed approval gates runs at the speed of the slowest decision.
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