Wireless Power Inverter Control Without a DC-DC Converter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies and increased costs due to the need for DC-DC converters, which generate heat and reduce system efficiency when adjusting output to control transmission power, and are limited by position, temperature, and power level variations.
Innovation Solution
A wireless power transmission apparatus that uses a primary coil and an inverter to transmit power, with a controller adjusting DC voltage and gate voltage based on received power information from the wireless power reception apparatus to maintain maximum efficiency without changing the system output, potentially excluding the DC-DC converter to reduce heating and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If DC-DC converter is used to control transmission power by varying output, then transmission power can be controlled, but system efficiency is reduced and heat is generated
Solution Approach 1:
The patent changes the control parameter from output power variation to DC voltage adjustment. By modifying the DC voltage applied to the primary coil while maintaining constant system output, the invention achieves transmission power control without the efficiency losses associated with DC-DC converters. This is accomplished through voltage-controlled current regulation in the primary coil, directly affecting the magnetic field strength and thus the power transfer.
Solution Approach 2:
The invention extracts and eliminates the DC-DC converter from the system by replacing it with a DC voltage control mechanism. This removal of the unnecessary component (DC-DC converter) resolves the contradiction by achieving power control through a more efficient method that does not generate excessive heat or reduce system efficiency.
2Power
If DC-DC converter is used to control transmission power, then transmission power can be adjusted, but heat is generated
Solution Approach 1:
The patent changes the control approach from output power adjustment to DC voltage modulation. By varying the DC voltage applied to the primary coil, the system can adjust transmission power without the heat-generating conversions performed by DC-DC converters. This voltage control method maintains constant system output while reducing thermal effects.
3Power
If DC-DC converter is included in the system, then transmission power control is possible, but manufacturing cost increases
Solution Approach 1:
The invention extracts the DC-DC converter from the system architecture and replaces it with a simpler DC voltage control circuit. This elimination of the expensive DC-DC converter component directly reduces manufacturing costs while maintaining the essential capability of transmission power control through alternative means (voltage control of primary coil).
Solution Approach 2:
The patent replaces the expensive DC-DC converter with a more economical DC voltage control mechanism. This substitution uses simpler, cheaper components to achieve the same functional outcome, thereby reducing manufacturing costs without sacrificing power control capability.
4Power
If additional power coil is used for DC-DC converter operation, then transmission power can be controlled, but device complexity increases
Solution Approach 1:
The invention extracts and removes the additional power coil requirement by eliminating the DC-DC converter from the system. By using DC voltage control on the existing primary coil, the patent achieves power control without needing extra coils, thereby reducing device 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 maintains optimal power transmission efficiency regardless of position, temperature, and power level variations, reducing manufacturing costs and heat generation by controlling DC voltage and gate voltage dynamically, thus enhancing system performance and reliability.
Implementation Method 1
a primary core including at least one primary coil transmitting a power signal to the wireless power reception apparatus by coupling to a secondary core comprised in the wireless power reception apparatus by magnetic induction or magnetic resonance
Implementation Method 2
an inverter connected to the primary core and applying an AC voltage necessary to transmit the power signal
Data Source
AI summary
A wireless power transmission device, and a transmission power control method therefor are provided. A wireless power transmission device for wirelessly transmitting power to a wireless power receiving device can comprise: a primary core comprising at least one primary coil and transmitting a power signal to the wireless power receiving device by being coupled, through magnetic induction or magnetic resonance, to a secondary core provided at the wireless power receiving device; an inverter connected to the primary core so as to apply an alternating voltage necessary for transmitting the power signal; and a controller connected to the inverter, and controlling a direct voltage to be applied to the wireless power transmission device and/or a gate voltage of the inverter on the basis of the information on the power received at the wireless power receiving device by the power signal.