Two brands briefed the same charger in the same quarter. One approved a working sample and released the tooling; the other ran the sample through a documented gate with a thermal measurement and a compliance review first. The second programme reached the shelf a month later and never re-cut the enclosure. The gates are what that month buys.
Charger new product introduction: the stage gates
Five gates, and each answers one question.
Is the requirement right, does the sample work, does the design hold, does the production line hold, and is the released unit the one that will ship. A programme that merges two gates usually pays for it in tooling rather than in time.
Two programmes, one enclosure change
The gate that was skipped was the thermal measurement.
The first programme released the die after a functional sample, and the enclosure was re-cut once because the charger ran hotter in the shipping configuration than it had on the bench. The second measured the temperature inside the enclosure before the die was cut, so the number that would have forced the change was known while the change was still free.
Gate one: the requirement and the platform
It fixes what the unit has to do before anything is designed.
The output profiles, the port count, the market and the certification that follows from it, the enclosure size target and the volume band. Each of those constrains the platform, and a requirement that arrives later moves the tooling rather than a document.
Gate two: the engineering sample
It answers whether the design works at all.
A functional sample built on the intended platform, measured across its output range and fitted in the intended enclosure. The gate is passed on measurements rather than on a working unit, because a unit that charges a phone proves very little about the ones that will be made.
Gate three: the design validation
It answers whether the design is safe and repeatable.
The thermal result in the shipping enclosure, the safety margins, the electromagnetic performance and the derating on the critical components. Pre-compliance testing at this gate is what makes the formal submission an administrative step rather than an investigation.
| Gate | Question answered | Evidence | Cost of skipping it |
|---|---|---|---|
| Requirement | What must the unit do | Specification and market list | Tooling moved late |
| Engineering sample | Does the design work | Measured output and thermal data | A redesign after tooling |
| Design validation | Is it safe and repeatable | Pre-compliance and margin records | A failed submission |
| Production validation | Does the line hold the design | Pilot run records and yield | Field returns at launch |
| Golden sample | Is this the shipping unit | Approved reference with its revision | Disputes on the second order |
Gate four: the production validation
It answers whether the line can repeat the sample.
A pilot run on production tooling and production test fixtures, with the yield, the cycle time and the points where the line deviated from the sample. The output is the process rather than the product, which is why it cannot be signed off from a sample built by hand.
Gate five: the golden sample and the release
One unit becomes the reference for everything that follows.
The approved sample is sealed, photographed and recorded with the revision of the firmware, the enclosure and the packaging. Every later comparison, including the one that takes place after a complaint on the second order, refers back to that unit rather than to a memory of the first delivery.
What each gate costs and what it prevents
Three costs, and each is smaller than the failure it prevents.
Measurement time at the engineering and validation gates, a pilot run at the fourth, and a day of documentation at the fifth. Set against a re-cut tool, a failed submission and a field return, the sequence is the cheaper of the two paths by a wide margin.
Who signs each gate
Each gate has an owner, and the owner is the party that can answer the question. The requirement gate belongs to the brand, because it defines the market and the use; the engineering and design gates belong to the engineering function; the production gate belongs to the line.
The signature matters because it fixes the point at which a change becomes formal rework rather than part of the development. A design change after the production gate is recorded against the process, which is what makes it visible.
The golden sample is signed by both parties, because it is the definition of the shipping product and the reference for every later comparison.
A programme that names the owner of each gate spends less time discussing whether a change is in scope, because the answer follows from which gate has closed.
FAQ
How long does the sequence take?
It depends most on the testing at the validation gate, because that is where an external laboratory is involved. The other gates are internal steps measured in days. The internal gates are the ones that can be compressed, so a tight schedule usually shortens the sample reviews rather than the laboratory work. A programme with a fixed shelf date keeps the laboratory slot booked and shortens the internal reviews instead.
Can two gates be merged?
They can, and the usual pairing is the engineering sample with the design validation. Merging them means the thermal and safety measurements are taken later, which reduces the room available to change the design. Record the merge, because a customer asking what was verified on a configuration will be answered from whichever build covered it. The trade-off is a wider tolerance for change later in the programme.
What is a golden sample used for?
It is the reference for the shipping configuration. Inspections and later comparisons are made against it, so it is sealed and recorded rather than kept as a spare unit. It is also the reference when a question arises about the packaging, because the assembled pack is sealed with the unit rather than kept separately. It also settles disputes about appearance, because both parties hold the same reference.
Does the sequence change for an existing platform?
It shortens. Where the platform and the enclosure already exist, the requirement and validation gates reuse the earlier evidence, and the work concentrates on what has actually changed. The shortened sequence still produces the three artefacts, so a later audit can read the same record as a new programme would. The evidence is the same, so a second market can reuse the characterisation rather than repeat it.
Next step
Send the requirement, the markets and the target volume to Wecent Group through the contact page. The reply proposes the platform, the gates and the evidence each one produces. Related reading: OEM and ODM charger manufacturing, GaN charger applications and charger quality control. External references: BSI standards, IEC standards, USB Implementers Forum charger specification, Wireless Power Consortium, EU CE marking and EU energy efficient products.
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