Wireless Power ICs Achieving Significant Power Gains: Practical Applications of Wireless Power Transfer

Wireless Power Content List

Table of Contents

  1. Achieving Significant Power Gains: Practical Applications of Wireless Power Transfer
  2. Circuit Application Example 1: Using ABLIC Standard Coils
  3. Circuit Application Example 2: Using Commercial Qi Coils
  4. Summary of Experimental Results and Circuit Constants Used in the Experiment
  5. Try ABLIC's Wireless Power ICs

1. Achieving Significant Power Gains: Practical Applications of Wireless Power Transfer

ABLIC's wireless power ICs, including the transmitter control IC and receiver control IC, regulate the timing of power transfer but do not impose limitations on power supply capacity. Instead, the power supply capacity is determined by the external circuits. In ABLIC's wireless power standard evaluation circuit, the transmission and reception power are designed for 0.5W (100mA/5V).

ABLIC's Wireless Power Standard Evaluation Circuit

  • ● Transmission Circuit
  • ● Reception Circuit
  • ● Reception Circuit with Charge Function

*The standard evaluation circuit mentioned on this page refers to these three circuits. Additionally, the term "standard coil" refers to the coil used in these circuits.

Overall configuration of the transmission circuit
Overall configuration of the transmission circuit

*The standard evaluation circuit mentioned on this page refers to these three circuits. Additionally, the term "standard coil" refers to the coil used in these circuits.

Overall configuration of the reception circuit
Overall configuration of the reception circuit

*The standard evaluation circuit mentioned on this page refers to these three circuits. Additionally, the term "standard coil" refers to the coil used in these circuits.

Overall configuration of the reception circuit with a charge function for small lithium-ion rechargeable batteries
Overall configuration of the reception circuit with a charge function for small lithium-ion rechargeable batteries

On this page, we will introduce two methods to increase the supplied power of wireless power transfer by simply changing the coils and circuit constants, based on this standard evaluation circuit.

Circuit Application Example 1: Using ABLIC Standard Coils (Transmitter Coil 21μH, Receiver Coil 26μH)
Circuit Application Example 2: Using Commercial Qi Coils (Transmitter Coil 6.8μH, Receiver Coil 6.8μH)

Note:  The experimental results on this page are provided for reference only and are not intended for mass production design. If using the circuit shown, please perform a thorough evaluation to ensure it complies with your actual standards

2. Circuit Application Example 1: Using ABLIC Standard Coils (Transmitter Coil 21μH, Receiver Coil 26μH)

Experimental Results

Power transfer capacity (d = 3mm) Supplied power
340mA Achieved 1.7W

Transmission Circuit/Reception Circuit

Square (dashed line) : indicates differences from the standard evaluation circuit. For more details on coils and circuit constants, click here.

Figure 1 Circuit Application Example 1: Transmission Circuit/Reception Circuit
Figure 1 Circuit Application Example 1: Transmission Circuit/Reception Circuit

Measured Data

Figure 2 Circuit Application Example 1: Measured Data VOUT - IOUT Figure 3 Circuit Application Example 1: Measured Data Efficiency - IOUT
Figure 2 Circuit Application Example 1: VOUT - IOUT Figure 3 Circuit Application Example 1: Efficiency - IOUT

3. Circuit Application Example 2: Using Commercial Qi Coils (Transmitter Coil 6.8μH, Receiver Coil 6.8μH)

Experimental Results

Power transfer capacity (d = 3mm) Supplied power
240mA Achieved 1.2W

Transmission Circuit/Reception Circuit

*The 5V to 9V boost DC-DC converter described in the standard evaluation circuit is not used; instead, 9V is supplied from an external power source.
Square (dashed line) : indicates differences from the standard evaluation circuit. For more details on coils and circuit constants, click here.

Figure 4 Circuit Application Example 2: Transmission Circuit/Reception Circuit
Figure 4 Circuit Application Example 2: Transmission Circuit/Reception Circuit

Measured Data

Figure 5 Circuit Application Example 2: Measured Data VOUT - IOUT Figure 6 Circuit Application Example 2: Measured Data Efficiency - IOUT
Figure 5 Circuit Application Example 2: VOUT - IOUT Figure 6 Circuit Application Example 2: Efficiency - IOUT

4. Summary of Experimental Results and Circuit Constants Used in the Experiment

Experimental Results

Circuit configuration Power transfer capacity (d = 3mm) Supplied power Operating frequency
Standard Evaluation Circuit 100mA 0.5W 100kHz
Circuit Application Example 1: Using ABLIC Standard Coils 340mA 1.7W 70.4kHz
Circuit Application Example 2: Using Commercial Qi Coils 240mA 1.2W 116kHz

Transmission Circuit: Circuit Constants Used in the Experiment

Transmitter (Tx) circuit Resonant coil Resonant capacitor Resistor (RTON) DC-DC
converter		 Diode for
DC-DC converter		 Fuse
Standard evaluation circuit 21μH (Ø22) 0.1μF 1.1MΩ S-8333 SBD, 30V, 0.5A ✔
Circuit Application Example 1: Using ABLIC Standard Coils 21μH (Ø22) 0.1μF 2.0MΩ S-8333 SBD, 30V, 1.5A -
Circuit Application Example 2: Using Commercial Qi Coils 6.8μH (Ø15.3) 0.2μF 820kΩ - - -

Reception Circuit: Circuit Constants Used in the Experiment

Reception (Rx) circuit Resonant coil Resonant capacitor
Standard evaluation circuit 26μH (Ø14) 0.1μF
Circuit Application Example 1: Using ABLIC Standard Coils 26μH (Ø14) 0.1μF
Circuit Application Example 2: Using Commercial Qi Coils 6.8μH (Ø15.3) 0.3μF

For details on the components used in these circuit application examples and our wireless power ICs, please contact our sales representatives.

Return to Main Page

Effortlessly Achieve Wireless Power Transfer! ABLIC's Wireless Power ICs

Next

Resolving Questions about Wireless Power Transfer: Qi Certification, Radio Act, EMC