Efficient Voltage Regulation for Wireless Charging Modules
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Summary
Problems
Existing wireless power transmission systems for portable devices face inefficiencies due to power dissipation and heat generation in low dropout amplifiers, particularly when rectifying high input voltages to lower output voltages, which is undesirable in compact devices.
Innovation solutions
A wireless power receiver system that employs a low dropout regulator during startup and transitions to a switching regulator for efficient power output, disabling the low dropout regulator to prevent power dissipation and heat generation, using a feedback resistance control circuit and drive circuitry to manage the voltage output.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a low dropout amplifier is used to regulate voltage from rectified voltage to output voltage, then useful regulating ability is achieved, but power is dissipated as heat leading to inefficient power transfer
Why choose this principle:
The voltage regulation function is segmented into two distinct stages: a low dropout amplifier stage for initial regulation and a switching regulator stage for efficient power delivery. This segmentation allows each component to operate in its optimal efficiency range, with the LDO handling voltage stabilization and the switching regulator handling bulk power conversion with minimal losses.
Principle concept:
If a low dropout amplifier is used to regulate voltage from rectified voltage to output voltage, then useful regulating ability is achieved, but power is dissipated as heat leading to inefficient power transfer
Why choose this principle:
The system dynamically switches between two regulator configurations based on operating conditions. The low dropout amplifier operates during startup and transitions to a switching regulator for normal operation. This dynamic reconfiguration optimizes power efficiency while maintaining voltage regulation across different operational phases.
Application Domain
Data Source
AI summary:
A wireless power receiver system that employs a low dropout regulator during startup and transitions to a switching regulator for efficient power output, disabling the low dropout regulator to prevent power dissipation and heat generation, using a feedback resistance control circuit and drive circuitry to manage the voltage output.
Abstract
A system comprising includes a wireless power receiver generating a rectified voltage. A low dropout regulator (LDO) generates a first regulated output voltage from the rectified voltage, during a first phase. A first switch couples the first regulated output voltage to a voltage output node during the first phase. During a second phase, the LDO generates a second regulated output voltage from the rectified voltage. A switching regulator generates a third regulated output voltage during the second phase. A second switch couples the third regulated output voltage to the voltage output node during the second phase. During a third phase, the LDO is disabled, while the switching regulator continues to generate the third regulated output voltage. The first switch opens during the third phase while the second switch remains closed.