Wireless Charging Receiver Circuit Integrating Rectifier and Charge Pump
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Solution Overview
Problem
Current wireless charging receiver circuits require a large number of power switches and filter capacitors, leading to a large-size integrated circuit device and higher integration costs due to the need for efficient DC/DC conversion from high operating voltages to low battery voltages.
Innovation Solution
A wireless charging receiver circuit design that includes a first and second bridge arm unit, voltage converter units, a filter circuit, a bias power supply circuit, and a control unit, where the bridge arm units are series-connected switch transistors and the voltage converter units are connected to the filter circuit, reducing the need for external filter capacitors and minimizing the size and cost of the integrated circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a charge pump based DC/DC converter is used to convert voltage from 20V to 5V, then power conversion efficiency is improved (reaching 98%), but the number of power switches and filter capacitors increases, leading to larger integrated circuit size and higher integration cost
Solution Approach 1:
The patent combines the voltage conversion function with the rectifier circuit by integrating the charge pump based DC/DC converter directly into the wireless charging receiver circuit. This merging eliminates the need for separate filtering stages and reduces the number of discrete power switches and filter capacitors required, thereby decreasing integrated circuit size while maintaining high power conversion efficiency of 98%
2Power
If two charge pump based DC/DC converters are cascaded (4:2 and then 2:1) to lower output voltage from 20V to 5V, then voltage conversion is achieved, but the number of integrated circuit chips increases to three
Solution Approach 1:
The patent segments the voltage conversion process into a single integrated circuit chip that performs both rectification and voltage conversion functions. Instead of using three separate chips (wireless charging receiver chip, high-voltage 4:2 charge pump chip, and low-voltage 2:1 charge pump chip), the invention integrates all these functions into one chip, reducing the total number of chips while maintaining the required 20V to 5V voltage conversion capability through cascaded charge pump stages
3Ease of manufacture
If the wireless charging receiver and high-voltage charge pump are integrated in a single device, then component configuration is simplified, but additional filter capacitors and power switches are required, increasing integrated circuit size
Solution Approach 1:
The patent creates a multi-functional integrated circuit that simultaneously performs rectification, voltage conversion, and filtering functions. The wireless charging receiver circuit is designed to incorporate the charge pump based DC/DC converter, allowing a single device to handle multiple functions that would traditionally require separate components. This universality reduces the need for additional filter capacitors and power switches, thereby decreasing integrated circuit size while simplifying component configuration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design reduces the size of the integrated circuit device and lowers integration costs by minimizing the number of external filter capacitors and power switches, while maintaining high power conversion efficiency.
Implementation Method 1
Since a wireless charging transmitter transmits energy in the form of a magnetic field, the energy of the magnetic field needs to be converted to electric energy using a wireless charging receiver
Data Source
AI summary
A wireless charging receiver circuit includes a first bridge arm unit connected to the first node and a common ground node, a second bridge arm unit connected to the second node and the common ground node, a first voltage converter unit connected to the second node and the common ground node, a second voltage converter unit connected to the first node and a common ground node, a filter circuit, a bias power supply circuit, and a control unit configure to control the switch transistors, such that the voltage output terminals of the first voltage converter unit and the second voltage converter unit output a voltage signal.