P9222-R/RN Datasheet

© 2019-2022 Renesas Electronics Corporation

31

May 5, 2022

8. Applications Information

The P9222-R/RN is an integrated wireless power receiver for mobile or stationary devices. The device can receive and provide to its output up

to 5W of wireless power using near-field magnetic induction.

8.1 Receiver Coil

The following coils are recommended for use in 5W or 3W applications in order to achieve optimum performance with the P9222 receiver.

Table 8.

Recommended Coil Manufacturer

Output Power

Vendor

Part Number

Inductance at

100kHz

Resonant Caps (Cs)

DC Resistance at 20℃

5W

SUNLORD

MQQRR303008S8R2

8.2µH ± 10%

300nF

180mΩ max

3W

TDK

WR303050-12F5-ID

8.2µH ± 10%

300nF

280mΩ max

8.2 Series and Parallel Resonant Capacitor Selection

WPC inductive power transmission uses resonant circuits to enhance the inductive power transmission. Especially for systems with a low

coupling factor, a resonant receiver can improve power transfer. The simplified Rx-coil network consists of a series resonant capacitor, C1,

and a parallel resonant capacitor, C2. These two capacitors make up the dual resonant circuit with the Rx coil (see Figure 26) and must be

sized correctly as per the WPC specification.

Figure 26. Dual Resonant Circuits with Receiver Coil

To calculate C1, a 100kHz resonant frequency is used along with the measured L′S values (Receiver Coil inductance measured when placed

on the TX coil and shield)

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Equation 2

To calculate C2, a secondary resonance of 1.0MHz is used along with LS (Free space Receiver Coil inductance without TX coil and shield).

This calculation requires that C1 be determined first and used in Equation 3:

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(������������.������������������������������������������������×������������������������)������������×(������������������������−������������������������������������)

Equation 3