In the midst of rapid technological developments, wireless charging exist as one of technology innovation in human lives. An easy battery charging process has become a necessity for most people nowadays. The presence of wireless charging technology is definitely very useful of our life.
This technology also has been widely used in automotive industry in order to provide convenience for its users, especially when your smartphone battery runs out while driving.
In this article we will discuss all about wireless charging technology and its regulatory control in Indonesia.
What is wireless charging?
Wireless charging is a charging process that occurs through a process called inductive charging. This technology will perform such as a power transfer process, which is carried out by utilizing electromagnetic induction. The power that comes from the transmitter will be connected to the receiver on the smartphone device as wireless charging-enabled device.
How wireless charging works?
As already discussed earlier, the way wireless charging technology works is by utilizing the principle of electromagnetic induction which produces electric strength from a changing magnetic field. Wireless charging stations have coils that are connected to a power source.
Wireless charging technology does not create a power source but rather a method of power transfer. Wireless charging generally uses two coils. The first coil works as a magnetic field and the second one is to caught changes in flux that trigger electromagnetic force.
When wireless charging stations are connected to a power supply, a magnetic field will form around it. This magnetic field will be caught by another coil on the smartphone as wireless charging-enabled device. The coil is also connected to the smartphone battery. The electric current generated by the magnetic field then charges the smartphone battery wirelessly. We can sum up the operation of wireless charging as follows:
- Transmitter coil: in wireless charging technology, there is something called a charging pad or base station. This device has a coil of wire. When electric current moves through this coil, an electromagnetic field will be generated around it.
- Receiver coil: on the device to be charged such as a smartphone, there is another coil called the receiver coil. It is used to capture the energy generated by the electromagnetic field from the transmitter coil.
- Position of use: in order for wireless charging technology to work efficiently, make sure the transmitter and receiver coils are at a distance and position close to each other.
- Charging: when the transmitter and receiver coils are in the right position, electric current will flow to the receiver coil connected to the battery.
Why wireless charging better than wired version?
There is more convenience and advantage when we use wireless charging compared to the wired version.
Minimizes the risk of short circuits
Since wireless chargers do not use cables as electrical conductors, it gives for greater safety from the risk of electric shock or short circuits that can be minimized.
Practical and easy to use
This wireless charging technology is more practical and easy to use. We do not need to bother carrying cables for the needs of charging the device. The charging process can be easily done by simply placing the smartphone device on the charging pad.
Regulatory control for wireless charging in Indonesia
Wireless charging is one of the new technology adopted in Indonesia. Therefore, the sale of products with wireless charging features must meet the technical standards established by the regulatory.
The purpose of technical standardization for wireless charging devices is to ensure the safety and reliability of wireless charger product when it being used in Indonesian. Regulatory control for wireless charging technology is explained in the latest technical regulation of KEPEMEN KOMDIGI No. 46 year 2025 about the technical standards for wireless power transmission.
Referring to the technical regulation, there are three main aspects related to the radio frequency requirements for testing of wireless charging devices.
Wireless charging frequency bands
DJID has set several allowable frequency bands for wireless charging technology that can be used in Indonesia. Following are the allowable frequency bands based on KEPEMEN KOMDIGI No. 46 year 2025:
- 100 – 148,5 kHz;
- 315 – 405 kHz;
- 1700 – 1800 kHz;
- 6765 – 6795 kHz;
- 13,553 – 13,567 MHz.
Field strength
Field strength is the value of an electric or magnetic field measured at a certain distance. The testing process for field strength requirement is carried out as radiated testing inside a chamber at a distance of 3 and 10 meters.
Following are the field strength requirement for each wireless charging bands based on KEPEMEN KOMDIGI No. 46 year 2025:
| Frequency band | Field strength |
| 100 – 148,5 kHz | ≤ 66 dBµA/m at a distance of 10 meters |
| 315 – 405 kHz | ≤ -5 dBµA/m at a distance of 10 meters |
| 1700 – 1800 kHz | ≤ -5 dBµA/m at a distance of 10 meters |
| 6765 – 6795 kHz | ≤ 42 dBµA/m at a distance of 10 meters |
| 13,553 – 13,567 MHz | ≤ 60 dBµA/m at a distance of 10 meters |
This technical regulation limits the field strength to be safe when it being used with other devices in the same environment. The following are the regulated field strengths.
Spurious emission
Spurious emission is an unnecessary wave emitted by a device. The testing process for spurious emission requirement is carried out based on the international standard of EN 303 417. The results of the spurious emission in the frequency range of 30 MHz – 1 GHz must not exceed the specified limits.
This technical regulation ensure that the emissions from devices are still within the safe limits and do not interfere with other devices.
If you have any question related to DJID certification, please don’t hesitate to contact us by sending enquiry to info@narmadi.com.
