Power Supply Circuit With Adjustable Charging Threshold Control
Find Innovative SolutionsGenerate Solutions
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 for normal operation.
Innovation Solution
A control circuit that includes a charging current source, which starts providing a charging current to a power supply capacitor when the input voltage decreases to a charging start threshold voltage and stops when the power supply voltage reaches a charging stop reference voltage, with the threshold voltage adjusted to maintain a symmetric charging duration relative to the input voltage's minimum value, reducing the need for high voltage devices and power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the turns ratio of the auxiliary winding to the secondary winding is increased to maintain the power supply voltage above the lower limit, then the power supply voltage stability is improved, but the power loss increases and high voltage devices are required
Solution Approach 1:
The patent applies dynamics by making the charging threshold voltage adjustable rather than fixed. The control circuit dynamically adapts the charging threshold voltage based on the output voltage level, allowing the system to optimize its operation across different working conditions. This resolves the contradiction by enabling voltage stability through adaptive control without requiring consistently high turns ratios that cause power loss.
Solution Approach 2:
The patent changes the parameter of charging threshold voltage from a fixed value to an adjustable parameter. By varying the charging threshold voltage according to the output voltage, the system can maintain reliable power supply voltage without requiring high turns ratios in all operating conditions, thereby reducing power loss and eliminating the need for high voltage devices.
2Reliability
If the turns ratio of the auxiliary winding to the secondary winding is increased to maintain the power supply voltage above the lower limit, then the power supply voltage stability is improved, but the device complexity increases due to high voltage device requirements
Solution Approach 1:
The adjustable charging threshold voltage enables the system to dynamically adapt to different output voltage levels, maintaining power supply voltage stability without requiring high voltage devices. The control circuit modifies its charging behavior based on operating conditions, eliminating the need for complex high voltage component selection.
Solution Approach 2:
By changing the charging threshold voltage parameter, the patent allows the power supply circuit to operate effectively with standard voltage devices across a range of output voltages. This parameter adjustment eliminates the requirement for high voltage devices, thereby reducing device complexity while maintaining voltage stability.
3Reliability
If the charging current is provided continuously to maintain power supply voltage, then the voltage stability is improved, but the energy consumption increases
Solution Approach 1:
The patent implements periodic action by controlling the charging current source to operate in discrete charging cycles rather than continuously. The charging threshold voltage determines when charging should start and stop, creating a periodic charging pattern that maintains voltage stability within acceptable ranges while minimizing energy consumption by avoiding continuous charging.
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 reduced power dissipation and eliminates the requirement for high voltage devices by adjusting the charging threshold voltage, maintaining efficient power supply voltage regulation across varying output voltages.
Implementation Method 1
a power supply capacitor Cvcc and a power supply control circuit 22. The power supply capacitor Cvcc has a charging terminal coupled to the charging current source Is
Data Source
AI summary
A control circuit for controlling a power supply voltage of an integrated circuit is provided. The control circuit includes a charging current source. The charging current source receives an input voltage and provides a charging current to a power supply capacitor for generating the power supply voltage. The charging current source starts providing the charging current for charging the power supply capacitor when the input voltage decreases to a charging start threshold voltage and stops providing the charging current when the power supply voltage increases to a charging stop reference voltage. The charging start threshold voltage is adjusted to get a continuous time duration of providing the charging current to be substantially symmetric with respect to a minimum value of the input voltage.