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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWireless energy transfer (WET), also called wireless power transfer (WPT), delivers electrical energy from a source to a separate device without a conductive connection between them. A transmitter creates an electromagnetic field or radiated wave; a receiver captures that energy and converts it into usable electrical power. “Wireless” describes the connection between source and load—not a loss-free transfer or a method that works with every device.
What wireless energy transfer means
A WET system still needs the usual building blocks: an energy source, a transmitter, a receiver, and circuitry that converts the received energy into a form the load can use. What it removes is the conductive power link, such as a cable connecting a charger directly to a device.
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The term covers multiple ways of coupling energy across a gap. Their distances, hardware, operating conditions, and constraints differ, so “wireless charging” does not describe one universal design.
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Inductive coupling
In inductive transfer, alternating current in a transmitter coil creates a changing magnetic field. A nearby receiver coil couples to that field, inducing a voltage—much like a transformer with separated coils. This is the familiar principle behind close-range consumer charging pads. Transfer depends on factors such as separation, coil alignment, circuit losses, and nearby foreign objects. IEEE describes wireless power technologies and their applications.
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Resonant inductive coupling
Resonant systems tune the transmitter and receiver to resonate, which can extend useful transfer distance compared with simple close-coupled arrangements. The result depends on the particular system and its setup; there is no single distance or efficiency that applies to all resonant designs.
Capacitive coupling
Capacitive systems transfer energy through electric fields between electrodes. This is a distinct near-field technique, not another name for magnetic induction.
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Radiative or far-field transfer
Radiative systems direct electromagnetic waves—such as radio-frequency or microwave energy—toward a receiving antenna or another converter. This differs from a nearby charging pad and brings its own beam, conversion, exposure-assessment, and deployment considerations. It should not be treated as a ready-made consumer substitute for close-range inductive charging.
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How a phone charges without a cable
With a compatible inductive charging pad, power flows from the pad’s transmitter coil through a changing magnetic field to a receiver coil in the phone. The phone’s circuitry converts the received energy to charge its battery. The phone must support the relevant charging system, and placement and separation matter. A Qi-compatible pad is one example of this category; check both the device’s compatibility and the pad’s current specifications.
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Where wireless energy transfer is used
Phones and wearables make the idea familiar, but wireless transfer is also used or studied in medical, industrial, vehicle, and aerospace settings. Those applications can involve very different power levels, distances, geometries, standards, and infrastructure. Electric-vehicle wireless charging, for example, is a separate equipment and infrastructure use case rather than simply a larger phone pad.
IEC 61980-1:2020 applies to supply devices for wireless charging of electric road vehicles at standard supply voltages up to 1,000 V AC and 1,500 V DC. See the IEC catalog entry for IEC 61980-1:2020 for its stated scope.
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What determines performance and compatibility
There is no universal range or efficiency figure for wireless energy transfer. To evaluate a particular system, consider the design and operating conditions rather than relying on a generic claim.
- Transfer distance and alignment: How far apart the transmitter and receiver can be, and how sensitive operation is to their relative position.
- Delivered power and end-to-end efficiency: How much usable power reaches the load and how much is lost through coupling and conversion.
- Hardware and frequency: The size and design of the transmitter and receiver, and the operating frequency.
- Compatibility and infrastructure: Whether the receiver supports the transmitter’s method and whether the use case needs dedicated supply equipment.
- Exposure assessment: What assessment applies to the system’s technology, frequency, and use conditions.
These factors vary across implementations. A performance figure for one arrangement should not be generalized to every inductive, resonant, capacitive, or radiative system.
Safety standards and their scope
Standards describe defined equipment or assessment methods; their existence alone does not establish that every product is safe or compliant. IEC and IEEE’s IEC/IEEE 63184:2025 specifies methods for assessing human exposure to electromagnetic fields from stationary wireless power transfer systems over 3 kHz to 30 MHz, in terms including SAR, internal electric fields or current density, and contact currents. The 2025 edition focuses on inductive WPT. Its scope does not consider immunity of cardiac implantable electrical devices to radiated disturbances from WPT. Consult the IEC catalog entry for IEC/IEEE 63184:2025 and applicable local requirements for a particular installation or compliance question.
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