14F-6, No. 79, Sec. 1, Xintai 5th Rd, Xizhi Dist., New Taipei City, 221432 Taiwan (R.O.C.)
Tel: 886-2-2698-3877
Fax: 886-2-2698-4089
email : [email protected]
MICROTEST 9332 is designed to meet the requirements of circuit boards that utilize copper foil etching to create coil circuits. It enables electrical characteristic testing of multiple coil circuits on multi-layered boards. It provides 64 testing channels, allowing for simultaneous testing of 32 coil sets. The measured parameters include inductance, impedance, AC resistance, DC resistance, Q value, and more. The frequency range for measurements is from 10Hz to 200kHz. It supports PC connectivity software for remote programming and storage of test data. Additionally, it can be integrated into dedicated PCB testing equipment to achieve fully automatic or semi-automatic testing.
9332 Application
About Wireless Charging
With inductive coupling technology, the charger transfers energy to a electric device, such as a mobile phone.
The mobile phone will charge the battery by receiving energy, so there is no need to use wires between charger and device.
| Wireless Charging | |
| Charging Coil Tx | Charging Coil Rx |
 |
 |
| enamelled round winding wire |
Small, thin and low accept winding product is most suitable for smart wearable device. Wearable devices want to be thinner and lighter, so Charging Coil tend to be made by FPC.
|
Capacitance become bigger
→ Etching process not enough, distance between wires will become large.
Resistance become bigger
→ Etching process not well, wires will become slender.
Quality of coil is also a key factor effect resonance frequency.
→Diameter of coil wire
→Diameter and number of turns of coil
→Material of magnetic component (increase induction intensity)
The closer of working frequency and resonance point, the better transmission efficiency.
Poor processes will result in the resistance value of the copper foil circuit to increase as well as the parasitic capacitance; these will all cause high levels of losses to the inductance. Inductance offset causes a direct impact to the resonance frequency that is the key for wireless charging; once the resonance frequency curve has been offset, it may result in the risk of NG for products delivered to the module factory to test their functionalities.
Using LCR Meter to check Inductor Impedance characteristics of FPC Coil
1-to-32 LCR super-capacity electrical measurement artifact 9332
MICROTEST provides a total solution for the hundreds of tests required for NFC high frequency antennas and wireless charging inductance coil boards, overturning the traditional method of single channel testing with LCR meters and satisfying the performance of electrical tests for multi-boards preferred by circuit board manufacturers.
