Adaptive Charging Control Circuit for Power Supply Voltage Regulation
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Solution Overview
Problem
Conventional voltage converting circuits for fast charging power supplies require high voltage devices and experience significant power loss due to the high turns ratio of auxiliary 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 control circuit and a charging current source, which provides a charging control signal based on input voltage and power supply voltage to manage the charging of a power supply capacitor, adjusting the input reference voltage and controlling the charging current source to optimize power supply voltage regulation, 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 the auxiliary winding to secondary winding is increased to maintain power supply voltage above the lower limit, then the power supply voltage is maintained for normal operation, but high voltage devices are required and power loss increases
Solution Approach 1:
The patent applies dynamics by making the charging control circuit dynamically adjust the charging current based on real-time comparison between the power supply voltage and reference voltage. The circuit transitions from a static fixed turns ratio approach to a dynamic control mechanism that adjusts charging current accordingly, resolving the contradiction between maintaining reliable voltage and reducing energy loss.
Solution Approach 2:
The patent changes the parameter of charging current from a fixed value determined by turns ratio to a variable parameter controlled by voltage comparison. By adjusting the charging current parameter dynamically based on voltage conditions, the system achieves both reliable voltage maintenance and reduced power loss without requiring high voltage devices.
2Reliability
If the turns ratio of the auxiliary winding to secondary winding is increased to maintain power supply voltage above the lower limit, then the power supply voltage is maintained for normal operation, but high voltage devices are required
Solution Approach 1:
The patent changes the control parameter from fixed turns ratio to dynamic charging current adjustment. By modifying the charging current parameter based on voltage comparison, the system maintains reliable power supply voltage without requiring high voltage devices, thus reducing device complexity while preserving reliability.
Solution Approach 2:
The patent implements feedback by continuously comparing the power supply voltage with the reference voltage and using the comparison result to control the charging current. This closed-loop feedback mechanism ensures reliable voltage maintenance through intelligent control rather than relying on high voltage hardware components.
3Device complexity
If a fixed turns ratio is used in the auxiliary winding, then the circuit structure is simple, but power loss increases and high voltage devices are required
Solution Approach 1:
The patent transforms the static fixed turns ratio structure into a dynamic control system. The charging control circuit dynamically adjusts the charging current based on voltage conditions, maintaining circuit structure simplicity while eliminating the power loss issue associated with fixed high turns ratio designs.
Solution Approach 2:
The patent changes the charging current from a fixed parameter determined by turns ratio to a dynamically adjustable parameter. This parameter change allows the system to maintain simple circuit structure while reducing power loss through intelligent current control based on real-time voltage conditions.
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 effectively regulates the power supply voltage, reducing power dissipation and eliminating the need for high voltage devices, even at high output voltages, by dynamically controlling the charging current and adjusting the input reference voltage, thus enhancing efficiency and reducing component stress.
Implementation Method 1
The charging current source is coupled to the input voltage and provides a charging current to a power supply capacitor based on the charging control signal
Implementation Method 2
The input voltage is received from an AC power supply through a rectifying circuit
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 is coupled to the input voltage and provides a charging current based on the charging control signal. When the input voltage decreases to an input reference voltage, the charging control signal controls the charging current source to provide the charging current. When the power supply voltage increases to a charging stop reference voltage, the charging control signal controls the charging current source to stop providing the charging current.