Two-Stage Charging Power Supply Without a Bulk Capacitor
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Solution Overview
Problem
Current power supply devices are large and not portable due to the need for large energy storage elements, which negatively impacts user experience.
Innovation Solution
A power supply device with a two-stage conversion architecture that boosts input AC voltage, utilizing a variable bus voltage for energy storage, eliminating the need for a large volume capacitor, and employing PWM and PFM signals to adjust output voltage based on detected values for efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large volume capacitor is used for energy storage in the power supply device, then the energy storage capacity is improved, but the volume of the power supply device increases
Solution Approach 1:
The patent removes the large volume capacitor from the power supply device entirely. Instead of using a capacitor for energy storage, the system employs a two-stage conversion architecture where the first stage boosts AC voltage to a high voltage pulsating DC, and the second stage converts this to constant DC for charging. This extraction of the capacitor eliminates the volume problem while maintaining energy storage capability through the conversion process itself.
Solution Approach 2:
The patent changes the operating parameters of the power supply system by implementing a two-stage voltage conversion process. The first stage transforms AC voltage to a high voltage pulsating DC with a voltage value greater than the input AC voltage, and the second stage converts this to a constant DC voltage suitable for charging. This parameter transformation allows the system to achieve the required energy storage and power delivery without relying on large physical capacitors.
2Power
If a large volume capacitor is used for energy storage, then the power supply capacity is improved, but the portability and user experience deteriorate
Solution Approach 1:
By removing the large volume capacitor from the system, the patent directly addresses the portability issue. The power supply device becomes compact and portable while maintaining adequate power supply capacity through the two-stage conversion architecture, which efficiently transforms and delivers power without requiring large energy storage components.
3Quantity of substance
If a large volume capacitor is used, then the energy storage function is improved, but the service life and safety are worsened
Solution Approach 1:
The patent eliminates the large volume capacitor, which is typically a source of safety concerns and limited service life due to degradation over time. By removing this component entirely and replacing it with an active two-stage conversion system, the patent improves reliability and safety while maintaining the necessary energy storage and power delivery functions through controlled voltage transformation.
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 reduces the volume of the power supply device, improves service life and safety by removing the large volume capacitor, and enhances charging efficiency through adaptive voltage control.
Implementation Method 1
a first-stage conversion circuit, configured to convert a received alternating current (AC) voltage to a pulsating direct current (DC) voltage
Implementation Method 2
a second-stage conversion circuit, connected to the first-stage conversion circuit, and configured to convert the pulsating DC voltage to output a constant DC voltage
Data Source
AI summary
A power supply device and a charging control method are provided. The power supply device includes a first-stage conversion circuit and a second-stage conversion circuit; the first-stage conversion circuit is used for converting a received alternating current voltage into a pulsating direct current voltage, the voltage value of the pulsating direct current voltage being greater than the voltage value of the alternating current voltage; the second-stage conversion circuit is connected to the first-stage conversion circuit, and used for converting the pulsating direct current voltage to output a constant direct current voltage.