Switched Capacitor Voltage Divider for DC/DC Converter Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing DC/DC converters experience increased output voltage fluctuations with changing input voltage and load current, affecting device operation.
Innovation Solution
An electronic device with a first voltage conversion unit that divides the input voltage and a control unit to adjust the voltage division ratio, ensuring the output voltage decreases as the input voltage increases, using a switched capacitor circuit and power supply control circuit to manage the voltage division ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a DC/DC converter with switched capacitor circuit is used to convert input voltage to output voltage, then voltage conversion is achieved, but output voltage fluctuations increase as load current increases
Solution Approach 1:
The voltage conversion function is divided into two stages: a first voltage conversion unit (switched capacitor circuit) that performs initial voltage division, and a second voltage conversion unit that performs final voltage regulation. This segmentation allows each unit to handle specific aspects of voltage conversion, with the first unit managing bulk voltage reduction and the second unit stabilizing the output, thereby resolving the contradiction between achieving voltage conversion and maintaining output stability.
Solution Approach 2:
The first voltage conversion unit acts as an intermediary between the input voltage source and the second voltage conversion unit. By placing this intermediate stage with controlled voltage division ratio, the system can reduce the input voltage to an appropriate level for the second unit while limiting the propagation of voltage fluctuations, thus stabilizing the overall output voltage.
2Device complexity
If the voltage division ratio of the first voltage conversion unit is fixed, then the circuit structure is simple, but the output voltage cannot be stabilized when input voltage changes
Solution Approach 1:
The voltage division ratio of the first voltage conversion unit is made dynamically adjustable rather than fixed. The control unit changes the voltage division ratio based on the detected input voltage level, allowing the system to adapt to varying input conditions. This dynamic adjustment capability enables the system to maintain stable output voltage across different input voltage ranges while adding only moderate complexity through switchable capacitor connections.
Solution Approach 2:
The electrical parameter (voltage division ratio) of the first voltage conversion unit is changed based on operating conditions. When input voltage is high, a larger division ratio is applied; when input voltage is low, a smaller division ratio is used. This parameter change strategy allows the system to maintain reliable output voltage stability across varying input conditions without requiring an overly complex circuit structure.
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 reduces the influence of output voltage fluctuations on device operation by maintaining stable power efficiency across varying input voltages and load conditions.
Implementation Method 1
a first voltage conversion unit that divides an input voltage and outputs the divided voltage
Data Source
AI summary
An electronic device includes a first voltage conversion unit that divides an input voltage and outputs the divided voltage, a detection unit that detects the input voltage, and a control unit that controls the voltage division ratio of the first voltage conversion unit such that the output voltage of the first voltage conversion unit decreases as the input voltage increases.