Power Supply Circuit With Dynamic Threshold Voltage Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional charge pump circuits fail to appropriately assert an output signal when the boosted voltage reaches a certain threshold due to variations in the DC input voltage, leading to inconsistent output signal assertion.
Innovation Solution
A power supply circuit with a threshold voltage varying circuit that adjusts the threshold voltage based on input voltage variations, combined with a comparator circuit to assert an output signal when the boosted voltage exceeds the adjusted threshold, ensuring accurate signal assertion across varying input voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed threshold voltage is used to detect boosted voltage, then the circuit structure is simple, but the output signal cannot be appropriately asserted when input voltage varies
Solution Approach 1:
The threshold voltage is changed from a fixed value to a dynamic value that varies with the input voltage. The threshold voltage generation circuit generates a threshold voltage that is lower than the input voltage, and this threshold voltage changes dynamically as the input voltage changes, allowing the comparison result to accurately reflect whether the boosted voltage has reached the desired level regardless of input voltage variations
Solution Approach 2:
The threshold voltage parameter is changed based on the input voltage parameter. When the input voltage increases above a reference voltage, the threshold voltage is decreased, maintaining the appropriate detection capability across different input voltage conditions
2Reliability
If the threshold voltage is lowered when input voltage increases, then the output signal assertion accuracy is improved, but the circuit complexity increases
Solution Approach 1:
The threshold voltage generation circuit serves multiple functions: it generates a threshold voltage that is lower than the input voltage, and it also varies this threshold voltage based on input voltage changes. This multi-functional approach achieves accurate detection across different input conditions without requiring separate circuits for each function
Solution Approach 2:
The threshold voltage acts as an intermediary between the input voltage and the comparison operation. By introducing this intermediate parameter that adapts to input voltage changes, the system achieves accurate boosted voltage detection without directly comparing against a fixed threshold
Data Source
AI summary
A power supply circuit includes an output voltage generation circuit configured to generate an output voltage higher than an input voltage, a threshold voltage generation circuit configured to generate a threshold voltage lower than the input voltage, a comparator circuit configured to assert an output signal when the output voltage rises above the threshold voltage, and a threshold voltage varying circuit configured to decrease the threshold voltage when the input voltage increases above a reference voltage.