A charging module — also called a power module — is the sealed power-conversion unit inside a DC fast charger. It takes AC from the grid and delivers controlled DC at the voltage and current the car requests. A DC charger normally racks several modules in parallel and sums their output, so the module, not the cabinet, is the core part the whole product is built around.
Key Takeaways
- A charging module converts grid AC into the controlled DC a car battery accepts.
- Chargers rack modules in parallel and sum their output; the module is the core part.
- A charging module is not a battery module: it converts power and stores nothing.
- Modules are sealed service parts — failed units are replaced, not opened.
What a Charging Module Does
Two jobs happen inside the module. First, the incoming AC is rectified — converted to DC. Second, that DC is regulated, adjusted continuously so the charger delivers what the car’s battery management system asks for as the session progresses. The charger’s controller supervises the set, but the conversion work happens in the module’s power stage; the explainer on how DC fast chargers work follows that session from the driver’s side. This is also the work an AC charger never does: an AC unit passes AC through to the car, whose onboard charger converts it — which is why DC cabinets are built around modules and home wallboxes are not.
One naming trap: a charging module is not a battery module. Battery modules are groups of cells inside an EV pack that store energy. A charging module stores nothing — it converts power, in the station, while the car is plugged in.
Inside a Module, at Concept Level
| Part | Role |
|---|---|
| Power semiconductors | The switches that perform the conversion, switching thousands of times a second |
| Magnetics | Inductors and transformers that shape and smooth the current and isolate input from output |
| Control board | Runs the module, follows the charger’s instructions and reports faults |
| Cooling path | A heatsink for fan cooling or a cold plate for liquid, matched to the cabinet design |
| Monitoring | Watches the module’s own temperature and output so protection can act early |
Modules are sealed for a reason: they are not opened in the field. A failed module is unplugged and replaced as a unit, which is why manufacturers describe modules as service parts rather than repairable assemblies.
How a Module Connects to the Rest of the Charger
A module does not work alone, but its three connections explain its place among the station’s components. On the input side, it takes AC from the cabinet’s supply wiring. On the output side, its DC joins the other modules on a shared output that feeds the connector and cable. And on the control side, it takes instructions from the charger’s controller — how much current to deliver — and reports back its own state: temperature, output and faults. The hardware around those connections exists so the conversion can be directed, measured and stopped: the controller directs it, metering measures what the modules delivered, and protection devices can disconnect the output. The module itself only converts — everything else is arranged around that one job.
EVDANCE and Module Specifications
EVDANCE’s compact DC charger, the EV-RHDC30K-L, is listed at 22 kW DC with OCPP 1.6J and an IP54 enclosure. Its product page states the rating and the protocol; the module specification behind that rating — block size, fault behaviour, spare availability — is a documentation question for the model file or a quotation. Buyers speccing a station, or planning a private-label model through the OEM program, can send those module questions via the contact page.
Frequently Asked Questions
Is a charging module the same as a power module?
In charger specifications, yes — the two names describe the same sealed conversion unit. “Charging module” is common in station documentation; “power module” is the wider electronics term.
Do AC chargers contain charging modules?
No. AC charging passes AC to the car and the car’s onboard charger converts it. Modules appear where the station itself must deliver DC — in DC fast chargers.
Can one failed module stop the whole charger?
It depends on the design. Because modules work in parallel, many chargers continue at reduced power with one module out; others shut down until it is replaced. The documented fault behaviour is part of the specification to check before buying.
Related Reading
- How Do DC Fast Chargers Work?
- How Fast Is a DC Fast Charger?
- Does DC Fast Charging Degrade the Battery?
- Is DC Fast Charging Level 3?
