Wireless Power Receiver Short-Circuit Timing for Heat and Noise
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Solution Overview
Problem
In wireless power transmission systems, the turn-on current on the power transmitting side becoming positive leads to increased heat generation and noise in elements, posing a challenge in protecting the load on the power receiving side and reducing heat and noise on the transmitting side.
Innovation Solution
A control device for a power receiving device that performs a short-circuit mode to avoid the region where the phase of the current in the inverter on the power transmitting side is advanced, thereby preventing a positive turn-on current, and allows for phase shifting to delay the current phase, reducing heat and noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power receiving device performs short-circuit mode to protect the load, then the load protection is improved, but the turn-on current on the power transmitting side becomes positive causing increased heat generation and noise
Solution Approach 1:
The invention changes the phase parameter of the current by controlling the switching timing of the short-circuit mode. By adjusting the phase of the current on the power receiving side, the turn-on current on the power transmitting side is controlled to be non-positive, thereby reducing heat generation and noise while maintaining load protection
Solution Approach 2:
The invention uses feedback by detecting the phase of the current on the power transmitting side and adjusting the switching timing of the short-circuit mode accordingly. This feedback mechanism ensures that the turn-on current remains non-positive, preventing excessive heat generation and noise while protecting the load
2Object-generated harmful factors
If the switching timing of the short-circuit mode is adjusted to delay the current phase, then the heat generation and noise are suppressed, but the control complexity increases
Solution Approach 1:
The invention simplifies the control by directly adjusting the switching timing parameter to achieve the desired phase delay. By changing this single parameter, the system suppresses heat generation and noise without requiring complex control mechanisms
Solution Approach 2:
The invention applies preliminary action by pre-setting the switching timing of the short-circuit mode to achieve the optimal phase delay before operation begins. This preliminary configuration simplifies the control process by eliminating the need for complex real-time adjustments
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 configuration effectively protects the load on the power receiving side and suppresses heat and noise generation in the power transmitting side elements by controlling the switching timing and phase shift of the short-circuit mode.
Implementation Method 1
a power receiving coil that receives power transmitted from a power transmitting coil of the power transmitting device in a contactless manner
Data Source
AI summary
In a control device for a power receiving device that is equipped with a power receiving coil that receives power contactlessly transmitted from a power transmitting coil of a power transmitting device, a switching element provided between the power receiving coil and a load is operated to perform a switching operation to control the output terminal of the power receiving coil. When executing the short-circuit mode that short-circuits between the two, the short-circuit mode is executed so as to avoid a region where the phase of the current in the inverter of the power transmission device is advanced.