Adaptive Charging Power Supply Circuit Without a Transformer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power supply units are large due to the size of transformers required for voltage conversion, making them unsuitable for portable devices, and require increased withstand voltage components to achieve a wide range of output voltages.
Innovation Solution
A power supply circuit comprising a rectifier circuit, charging circuit, driving voltage adjustment circuit, and sampling and feedback circuit that selectively outputs charging energy based on control voltage, adjusting the power extraction window and clamping voltage to optimize voltage regulation and reduce circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a transformer is utilized to step down high-voltage AC power into low-voltage AC power, then voltage conversion is achieved, but the size of the power supply unit increases
Solution Approach 1:
The patent extracts and removes the transformer component from the power supply system. Instead of using a transformer to step down voltage, the invention directly rectifies the high-voltage AC power and uses a charging circuit with controllable power extraction to regulate the voltage. This extraction of the transformer eliminates the need for large magnetic components while achieving the same voltage conversion function through electronic control.
Solution Approach 2:
The patent replaces the mechanical/electromagnetic transformer system with an electronic rectification and controlled charging system. The transformer's electromagnetic induction mechanism is substituted by a rectifier circuit that converts AC to DC, followed by a charging circuit that uses electronic switches and control signals to regulate power transfer. This substitution eliminates bulky magnetic components and enables compact design.
2Adaptability or versatility
If the withstand voltage required by the transformer is increased to provide a wide range of output voltage, then voltage range is expanded, but the size of high-withstand voltage components and power supply unit increases
Solution Approach 1:
The patent implements dynamic voltage regulation through a controllable charging circuit that adjusts power extraction based on real-time voltage conditions. The control circuit monitors the voltage at the energy supply terminal and dynamically adjusts the charging circuit's operation to maintain voltage within a target range. This dynamic control allows the system to adapt to different output voltage requirements without needing components designed for maximum withstand voltage, enabling compact design with wide voltage adaptability.
Solution Approach 2:
The patent changes the operating parameters of the charging circuit based on the detected voltage level. When the voltage exceeds the upper threshold, the control circuit reduces or stops power extraction; when voltage drops below the lower threshold, it increases power extraction. This parameter-based control allows the system to maintain stable output across a wide voltage range using components with lower voltage ratings, reducing overall size.
3Area of stationary object
If the size of the power supply unit is reduced for portable devices, then portability is improved, but voltage conversion capability becomes limited
Solution Approach 1:
The patent replaces the bulk electromechanical transformer with compact electronic circuits including a rectifier, charging circuit, and control unit. This substitution enables high-density integration of voltage conversion functionality into a small footprint suitable for portable devices, while maintaining full voltage conversion capability through electronic control mechanisms rather than electromagnetic transformation.
Solution Approach 2:
The patent uses parameter-based control to achieve versatile voltage conversion in a compact form. The control circuit adjusts operating parameters such as charging duration, power extraction rate, and switching frequency to accommodate different voltage conversion requirements. This parameter flexibility allows a small power supply unit to provide multiple output voltage levels and adapt to various loading conditions without requiring large physical components.
Data Source
AI summary
A voltage supply circuit includes a charging circuit, a window adjustment circuit, a driving voltage adjustment circuit, a sampling and feedback circuit and a storage circuit. The charging circuit includes a modulation input terminal for receiving a control voltage; and an energy supply terminal for selectively outputting a charging energy according to the control voltage. The window adjustment circuit is used to adjust the control voltage according to a sampling output voltage corresponding to an output voltage signal, and output the control voltage. The driving voltage adjustment circuit is used to keep the control voltage within a clamping voltage according to the output voltage signal. The sampling and feedback circuit is used to generate the output voltage signal according to a voltage at the energy supply terminal. The storage circuit is used to store the charging energy to pull up the voltage at the energy supply terminal.