Wireless Power Receiving Device Voltage Rise Protection
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Solution Overview
Problem
Existing wireless power transmission technologies for electric vehicles do not adequately address the issue of voltage rise during abnormal conditions like overvoltage, which can lead to damage and instability in protective circuits, impairing the protective function and potentially causing degradation or damage to devices.
Innovation Solution
A wireless power receiving device equipped with a power reduction unit featuring a switching element connected in parallel to the charging unit, controlled by a voltage detection and control unit to manage voltage and current, which activates the switching element to distribute excess current and minimize voltage rise, thereby enhancing protective function stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resistor is used to consume remaining power in the discharge unit, then the power storage device is protected from overcharging, but the protective circuit element itself is damaged when voltage exceeds allowable levels
Solution Approach 1:
The patent introduces a switching element as an intermediary component between the power receiving coil and the discharge unit. This switching element acts as a mediator that can rapidly disconnect the power flow when abnormal voltage conditions are detected, protecting both the power storage device and the discharge unit from voltage-related damage while maintaining the protective function's stability
2Reliability
If power transmission is stopped to prevent damage, then the power storage device is protected, but voltage continues to rise during the stop period causing protective circuit damage
Solution Approach 1:
The patent implements preliminary protective action by continuously monitoring voltage levels and preparing the switching element for rapid activation. Before voltage damage can occur, the system detects abnormal conditions and pre-positiones the switching element to immediately interrupt power flow, eliminating the dangerous voltage exposure period that exists in conventional stop-after-detection approaches
3Reliability
If the switching element is activated to distribute excess current, then voltage rise is suppressed, but the switching element may be damaged by excessive voltage
Solution Approach 1:
The patent provides beforehand cushioning by placing a protective circuit element in parallel with the switching element. This parallel protective element acts as a cushion or backup that absorbs excessive voltage stress before it can damage the switching element, ensuring the switching element can reliably distribute excess current during abnormal conditions without suffering from voltage-related damage
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 suppresses voltage rise and current-related damage during abnormal conditions, ensuring increased stability and protection for the wireless power receiving device and charging unit, even in light load states.
Implementation Method 1
a power receiving coil L2, and a rectifying unit 210. The rectifying unit 210 is configured to rectify alternating-current power received by the power receiving coil
Implementation Method 2
The rectifying unit 210 is configured to rectify alternating-current power received by the power receiving coil L2 to direct-current power
Data Source
AI summary
A wireless power receiving device includes a voltage detection unit that detects an output voltage value of a rectifying unit, a power reduction unit that includes a switching element connected to a charging unit in parallel, and a control unit that controls operations of the switching element. In a case where the output voltage value detected by the voltage detection unit exceeds a first reference voltage value set in advance, the control unit controls and turns the switching element on by applying a voltage to the switching element, and controls the value of the voltage to be applied to the switching element so that the difference between the voltage value calculated on the basis of a current flowing in the switching element and a second reference voltage value set in advance decreases.