Wireless Power Receiver Ground Stabilization With Noise Blocking
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Solution Overview
Problem
Existing wireless power receiving circuits face challenges in stabilizing ground potential and suppressing noise current leakage to communication circuits, leading to potential malfunctions and damage, especially when asymmetrical configurations are used.
Innovation Solution
A wireless power receiving device with a power receiving resonance circuit, rectifier circuits, smoothing circuits, and an impedance circuit that stabilizes the ground potential by setting the direct current reference potential of the power receiving circuit equal to the ground terminal of the electronic control circuit, thereby preventing noise currents from flowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground potential and reference potential are connected directly, then the ground potential is stabilized, but noise current leaks from the power receiving circuit to the communication circuit
Solution Approach 1:
A potential stabilizing circuit is introduced as an intermediary component between the power receiving circuit and the communication circuit. This circuit includes a capacitor connected between the reference potential terminal and ground, and a resistor connected in series with the capacitor to the communication circuit ground terminal. The stabilizing circuit acts as a mediator that stabilizes the ground potential while blocking noise current from reaching the communication circuit.
Solution Approach 2:
The potential stabilizing circuit changes the electrical parameters (impedance characteristics) between the power receiving circuit and communication circuit. By using a capacitor with specific capacitance value and a resistor with specific resistance value, the circuit presents low impedance to DC ground potential stabilization while presenting high impedance to AC noise current, thus achieving both ground stability and noise suppression.
2Adaptability or versatility
If the wireless power receiving circuit uses an asymmetrical configuration, then design flexibility is improved, but noise current suppression becomes difficult
Solution Approach 1:
The potential stabilizing circuit serves as an intermediary that decouples the asymmetrical power receiving circuit from the communication circuit electrically. This allows the power receiving circuit to maintain its asymmetrical configuration for design flexibility while the stabilizing circuit ensures noise current suppression by providing a controlled impedance path to ground.
3Object-generated harmful factors
If the power receiving circuit and communication circuit are not connected, then noise current leakage is suppressed, but the ground potential becomes unstable
Solution Approach 1:
The potential stabilizing circuit provides a controlled connection between the power receiving circuit and communication circuit through impedance-matching components. The capacitor and resistor in the stabilizing circuit create a frequency-dependent impedance that allows DC ground potential stabilization while blocking AC noise current, thus achieving both ground stability and noise suppression simultaneously.
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 solution effectively stabilizes the ground potential and suppresses noise current leakage, reducing malfunctions and damage to the electronic control circuit while enabling stable communication and efficient power transfer.
Implementation Method 1
a power receiving resonance circuit including a power receiving coil and a power receiving resonance capacitor
Implementation Method 2
wireless power receiving device that performs wireless power reception
Implementation Method 3
a first rectifier circuit that rectifies a first alternating current that flows to the power receiving resonance circuit
Implementation Method 4
an impedance circuit, in the impedance circuit, an impedance value is set so that a direct current potential of the ground terminal is a same as the direct current reference potential
Data Source
AI summary
A wireless power receiving device includes a first power receiving alternating-current circuit including a power receiving resonance circuit and a rectifier circuit; a first power receiving direct-current circuit including a smoothing circuit and a load circuit; a second power receiving alternating-current circuit including a rectifier circuit; a second power receiving direct-current circuit including a smoothing circuit; and a connection line that electrically connects the first power receiving direct-current circuit and an electronic control circuit that includes a ground terminal. The connection line electrically connects a direct current reference potential of the first power receiving direct-current circuit and the ground terminal through an impedance circuit. In the impedance circuit, an impedance value is set so that a direct current potential of the ground terminal is the same as the direct current reference potential of the first power receiving direct-current circuit and is stabilized.