Wireless Charging Block Diagram and Working Principle


Hey, in this article we are going to see the block diagram of wireless charging and its working principle. We know that in modern days the wireless charging is gone very popular and is used in so many application areas such as mobile charging, electric vehicle charging, etc. Wireless charging mainly provides the function where no electrical connection between power supply or power source and load. So it eliminates the hesitation of plug-in and plug-out. Wireless Charging system provides more flexibility, portability, and Reliability.

Basic Block Diagram of Wireless Charging System

Wireless Charging Block Diagram, block diagram of wireless charging system



The wireless charging system consists of so many important parts or blocks, such as
  • Step Down Transformer
  • AC to DC converter or Rectifier Circuit
  • DC to High-Frequency AC converter or Inverter Circuit
  • Capacitance Compensation Circuit(Primary)
  • Power Transmitter Coil or Primary Coil
  • Power Receiver Coil or Secondary Coil
  • Capacitance Compensation Circuit(Secondary)
  • Rectifier Circuit
  • Filter Circuit
  • Regulator Circuit

Basic Working Principle of Wireless Charging System


There are various types of wireless charging systems available in the market but the main concept is almost the same for all. We have our utility power supply is AC or alternating current but we required Direct Current or DC power supply for charging. So let's know how the system works.


First of all the high voltage AC Supply(230V) is applied to the step-down transformer. The step-down transformer steps down the high voltage AC to low voltage AC(24V or 12V or 6V). After the low voltage AC supply is applied to the rectifier circuit that converts the AC into DC. Again the low voltage DC supply is converted into a very high-frequency AC supply using a DC to AC converter. This high-frequency AC power supply is fed to the power transmitter coil. The power receiver coil receives the power in the form of an AC supply.


Basically, the power is transmitted from the transmitter coil to the receiver coil in the principle of mutual inductance. You can refer to the transmitter coil as the primary coil of the transformer and the receiver coil as the secondary coil of the transformer. So there is no electrical connection between them but power can be transmitted easily. So you can see the receiver circuit is totally isolated from the transmitter circuit.


Now the output of the receiver coil is fed to the rectifier circuit so the AC power supply will be converted to the DC power supply. After the output DC supply from the rectifier circuit is provided to the filter circuit to remove the ripples from the DC. The filtered DC supply is fed to the regulator circuit. The regulator circuit always provides a constant voltage across the load even when the input voltage changes or load current varies.

Also, you can see in both primary and secondary coils the capacitance compensation circuit is connected. The function of those capacitance compensation circuits is to maintain the capacitance and eliminate the noises.


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Wireless Charging Block Diagram and Working Principle Wireless Charging Block Diagram and Working Principle Reviewed by Author on 1/11/2022 Rating: 5