Adaptive Charging Control for Power Supply Capacitor Loss Reduction
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Solution Overview
Problem
Conventional fast-charging power supply circuits require high voltage devices and experience significant power loss due to the high turns ratio of auxiliary to secondary windings, which is necessary to maintain the power supply voltage above a lower limit, especially when the output voltage is low.
Innovation Solution
A control circuit that includes a charging control circuit and a charging current source, which generates the power supply voltage by charging a power supply capacitor within a defined charging window, adjusting the charging period to be symmetric with respect to the input voltage's minimum value, thereby reducing the need for high voltage devices and minimizing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the turns ratio of auxiliary winding to secondary winding is increased to maintain power supply voltage above lower limit, then the power supply voltage is maintained, but high voltage devices are required and power loss increases
Solution Approach 1:
The patent applies dynamics by making the charging period adaptive rather than fixed. The control circuit adjusts the charging period based on the input voltage waveform, specifically positioning it symmetrically around the minimum value of the input voltage. This dynamic adjustment allows the system to maintain reliable power supply voltage while optimizing energy efficiency, resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The patent changes the parameter of charging period duration and timing based on input voltage characteristics. By adjusting the charging period to be symmetric with respect to the minimum input voltage value, the system optimizes the charging process to reduce power loss while maintaining the power supply voltage above the required lower limit, thus resolving the technical contradiction.
2Reliability
If the turns ratio of auxiliary winding to secondary winding is increased to maintain power supply voltage above lower limit, then the power supply voltage is maintained, but high voltage devices are required
Solution Approach 1:
The patent applies dynamics by making the charging period adaptive rather than fixed. The control circuit adjusts the charging period based on the input voltage waveform, specifically positioning it symmetrically around the minimum value of the input voltage. This dynamic adjustment allows the system to maintain reliable power supply voltage while optimizing energy efficiency, resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The patent changes the parameter of charging period duration and timing based on input voltage characteristics. By adjusting the charging period to be symmetric with respect to the minimum input voltage value, the system optimizes the charging process to reduce power loss while maintaining the power supply voltage above the required lower limit, thus resolving the technical contradiction.
3Reliability
If charging current is provided continuously to maintain power supply voltage, then the power supply voltage is stable, but energy efficiency decreases
Solution Approach 1:
The patent applies periodic action by implementing discontinuous charging within charging windows. The charging current source provides charging current only during specific charging periods within each charging window, rather than continuously. This periodic charging approach maintains power supply voltage stability while significantly improving energy efficiency by avoiding unnecessary charging during periods when the input voltage is sufficiently high.
Solution Approach 2:
The patent applies dynamics by making the charging period adaptive rather than fixed. The control circuit adjusts the charging period based on the input voltage waveform, specifically positioning it symmetrically around the minimum value of the input voltage. This dynamic adjustment allows the system to maintain reliable power supply voltage while optimizing energy efficiency, resolving the contradiction between reliability and energy loss.
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 allows for efficient generation of the power supply voltage without the need for high voltage devices, reducing power loss and improving circuit efficiency by adjusting the charging period based on the input voltage's characteristics.
Implementation Method 1
The charging current source receives the input voltage and provides a charging current to a power supply capacitor for generating the power supply voltage
Data Source
AI summary
A control circuit for controlling a power supply voltage is provided. The control circuit includes a charging control circuit and a charging current source. The charging control circuit provides a charging control signal based on an input voltage and the power supply voltage. The charging current source receives the input voltage and provides a charging current to a power supply capacitor for generating the power supply voltage based on the charging control signal. In a charging window, the charging control signal controls the charging current source to start providing the charging current for charging the power supply capacitor after a first time-interval from a start point of the charging window. The charging control signal controls the charging current source to stop providing the charging current when the power supply voltage increases to a charging stop reference voltage. A continuous time duration of providing the charging current is a charging period.