In the previous article we have discussed about wireless charging technology, so now let’s also discuss the implementation of wireless charging technology on modern power bank. Power bank is one of the smartphone accessories with functions to charge smartphone batteries in a portable way. This device is important to bring especially when we do travel activities. Along with the development of charging technology, one of the biggest breakthroughs is wireless charging technology. This technology has been widely adopted in today’s power bank devices.
In this article we will discuss all about wireless power bank and its DJID certification requirements in Indonesia.
What is wireless power bank?
Power bank is a device that practically functions to charge smartphones when there is no access to a power supply contact. This device is very helpful especially when we need to stay connected to our smartphones for a long period of time.
However, sometimes using a power bank with a cable is quite inconvenient for users. This problem can be overcome with the development of wireless charging technology and resulting in the trend of wireless power banks.
Wireless power bank is a type of power bank where the charging process is carried out using wireless charging technology. Wireless power bank allows users to charge smartphones simply by placing it on the power bank without connecting any cables and it can also be carried anywhere.
How does wireless power bank works?
Wireless power banks work by utilizing electromagnetic induction to transfer electrical energy from the charger to the device without using cables. It allows the charging process to take place simply by placing the device on the power bank, making it a practical solution for modern gadget users.
Here are the parts of a wireless power bank that operate during the charging process with modern gadgets like smartphones:
- Power source: wireless power banks generally have an internal battery to store the electrical energy.
- Transmitter coil: wireless power banks have a transmitter coil connected to their internal battery.
- Magnetic field: when the power bank is turned on and smartphones are placed on it, the transmitter coil produces a changing magnetic field.
- Receiver coil: the smartphones need to be charged must have a receiver coil inside.
- Inductive coupling: the magnetic field generated by the power bank induces an electric current in the receiver coil in the smartphones.
- Charging process: This induced electric current is then used to charge the device’s battery.
- Automatic power-off: similar to wired power banks, wireless power banks also often include automatic power-off when a smartphone’s is full.
Benefits of wireless power bank
The use of wireless charging features adopted into a power bank device provides several benefits to its users. Here are some of the benefits of using wireless power banks.
More convenient and simple charging process
Unlike wired power banks, wireless power banks do not require cables to connect power banks to the smartphones. Simply by placing a smartphone on the power bank and charging will take place. This charging process makes it more convenient and simple for the users.
More efficient batteries
Some users consider that charging their smartphones with wireless power banks to be more efficient. Users can use their smartphones with power that can last longer so that it is not wasteful and more efficient for the batteries.
Free from worn charging ports
The disadvantages of using wired power banks are the charging port wears out easily due to frequent of use. This can also make the connection for charging problematic. However, with wireless power banks, such worn conditions will not occur.
Contribute to waste reduction
When using a cable, there must be conditions that damage the cable, whether it is broken, wrinkled, or does not work. Therefore, many people replace their cables regularly. This causes electronic waste to pile up. However, by using the wireless version, users indirectly play a role in reducing cable waste.
DJID certification for wireless power bank
As mentioned earlier that a wireless power bank contains a transmitter coil to transmitting the electrical energy within low frequency. Because of these functions, wireless power banks need to meet applicable technical standards before being marketed in Indonesia. The process of fulfilling the technical standards is carried out through DJID certification process.
By processing DJID certification, it indicates that power banks with wireless capability has complied with applicable standards and can be marketed legally in Indonesia. Ownership of DJID certificates also guarantee that wireless power banks will keep working on the permitted frequency in Indonesia so that there no radio frequency interference occurred.
Before processing the DJID certification, it is necessary for certification applicants to perform RF and EMC tests for wireless power banks. Both RF and EMC test reports will be required during the DJID certification submission.
RF test for wireless power bank
Wireless power bank uses wireless charging technology during its operation. In Indonesia, wireless charging technology is regulated by the technical regulation of KEPMEN KOMDIGI No. 46 year 2025 regarding technical standards for wireless power transmission.
Generally, wireless power banks use radio frequency with a range of 115 – 205 kHz and 360 kHz to support the wireless charging process. Below are testing parameters of wireless power transmission test.
| Frequency range | Field strength | Transmitter spurious emission |
| 100 – 148.5 kHz | ≤ 66 dBµA/m | ETSI EN 300 330; ETSI EN 303 417 |
| 315 – 405 kHz | ≤ -5 dBµA/m | EN 300 330 |
EMC test for wireless power bank
Since most of wireless power banks are still supplied by DC power converter, then both EMC radiated and conducted emissions are still required to be tested. The EMC testing process will be conducted based on the international EMC standard of CISPR 32.
The testing of EMC radiated emission for wireless power banks is carried out in the frequency range of 30 – 1000 MHz and 1000 – 6000 MHz. Meanwhile, the testing of EMC conducted emission is carried out at main terminal power of wireless power banks within the frequency range of 150 kHz – 30 MHz.
If you have any question related to DJID certification, please don’t hesitate to contact us by sending enquiry to info@narmadi.com.
