Contactless Power Transfer Control for Stable Receiver Voltage
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Solution Overview
Problem
Existing contactless power transmission systems face challenges in stabilizing the voltage supplied to load devices without requiring additional circuits in the power receiver apparatus, as the power consumption or current consumption of load devices varies over time, leading to inefficiencies and increased size, weight, and cost when additional converters are used.
Innovation Solution
A controller apparatus in the power transmitter apparatus adjusts the frequency and voltage of transmitted power based on detected output voltage values from the power receiver apparatus, determining a stable frequency and voltage that minimizes dependency on load value variations, eliminating the need for extra circuits in the receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional power converter (such as a DC/DC converter) is provided in the power receiver apparatus to supply the load device with its required voltage, then the load device can receive stable voltage, but the size, weight, and cost of the power receiver apparatus increase and the efficiency decreases
Solution Approach 1:
The patent extracts the voltage regulation function from the power receiver apparatus and relocates it to the power transmitter apparatus. The controller in the transmitter adjusts the transmitting power based on detected output voltage values, eliminating the need for additional power converters in the receiver. This resolves the contradiction by maintaining voltage stability while reducing receiver complexity.
Solution Approach 2:
Instead of having the receiver regulate voltage through additional circuits, the invention inverts the control approach by having the transmitter adjust its output based on receiver feedback. The controller determines appropriate transmitting power to achieve the desired output voltage, thereby stabilizing voltage without adding complexity to the receiver side.
2Device complexity
If the power transmitter apparatus transmits power with fixed voltage and frequency, then the transmission system is simple, but the output voltage varies when the load value changes
Solution Approach 1:
The patent implements dynamic control where the controller adjusts the transmitting power (voltage and frequency) based on the detected output voltage and load conditions. This dynamic adjustment ensures stable output voltage despite load variations, resolving the contradiction between system simplicity and voltage stability.
Solution Approach 2:
The power receiver apparatus detects the output voltage value and communicates it back to the power transmitter apparatus. The controller uses this feedback information to determine the appropriate transmitting power, creating a closed-loop control system that maintains voltage stability without excessive complexity.
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
This solution allows for stable voltage supply to load devices without additional circuits in the power receiver, reducing size, weight, and cost while maintaining efficiency, even with varying load conditions.
Implementation Method 1
a power transmitter apparatus connected to a power supply, to a power receiver apparatus including a load device, such as a rechargeable battery
Implementation Method 2
a power supply circuit configured to generate transmitting power having a variable voltage and a variable frequency, and supply the transmitting power to the transmitting coil
Data Source
AI summary
A control circuit controls a power supply circuit to generate transmitting power having a frequency varying within a frequency range. The control circuit determines a stably transmitting frequency based on a detected output voltage of a power receiver apparatus, the stably transmitting frequency indicating a frequency of the transmitting power at which dependency of the output voltage on a load value of the power receiver apparatus is at least locally minimized within the frequency range. The control circuit determines a transmitting voltage based on the detected output voltage, the transmitting voltage indicating a voltage of the transmitting power at which the output voltage reaches a target voltage when generating transmitting power having the stably transmitting frequency. The control circuit controls the power supply circuit to generate transmitting power having the stably transmitting frequency and the transmitting voltage.