Variable-Resistor Power Supply for Fast Start-Up Voltage Stability
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Solution Overview
Problem
Existing power supply circuits face challenges in reducing start-up time while maintaining stability of the output voltage, especially when the input voltage varies or becomes negative.
Innovation Solution
A power supply circuit with a variable resistor and an adjustment circuit that increases the resistance value after a predetermined time period, allowing for a rapid start-up and stable output voltage generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the current flowing from the power supply voltage Vcc to the power supply circuit increases to reduce start-up time, then the start-up time is reduced, but the level of the power supply voltage Vreg is likely to be affected by a variation in the power supply voltage Vcc
Solution Approach 1:
The patent applies the dynamics principle by making the resistance value of the resistor dynamic rather than fixed. The resistance value changes based on the input voltage conditions: it has a first value when the input voltage is within a normal range, and a second value (different from the first) when the input voltage is outside the normal range. This dynamic adjustment allows the circuit to optimize start-up current based on actual voltage conditions, reducing start-up time while maintaining output voltage stability.
Solution Approach 2:
The patent implements parameter changes by modifying the resistance value parameter of the resistor based on input voltage conditions. The control circuit detects whether the input voltage is within the normal range and adjusts the resistance value accordingly. This parameter change enables the circuit to adapt to varying input conditions, achieving both fast start-up and stable output voltage regulation.
2Adaptability or versatility
If the resistance value of the resistor is fixed, then the circuit structure is simple, but the circuit cannot adapt to variations in input voltage and maintain stable output
Solution Approach 1:
The patent applies feedback by incorporating a control circuit that monitors the input voltage and adjusts the resistance value accordingly. The control circuit receives feedback about the input voltage level and modifies the resistor's resistance value to maintain stable output voltage. This feedback mechanism enables the circuit to adapt to input voltage variations while keeping the overall structure relatively simple.
Solution Approach 2:
The patent implements universality by designing a circuit that can handle multiple input voltage conditions with a single integrated solution. The control circuit provides multi-functionality by performing both voltage monitoring and resistance adjustment functions, allowing the power supply circuit to operate effectively across a wide range of input voltage conditions without requiring separate circuits for different scenarios.
Data Source
AI summary
A power supply circuit configured to generate an output voltage at a target level from an input voltage thereof. The power supply circuit includes a wiring configured to receive the input voltage, a variable resistor provided between the wiring and a predetermined node, a voltage generation circuit configured to apply a voltage at a predetermined level to the predetermined node based on a current from the variable resistor, an output circuit configured to output the output voltage at the target level, in response to the voltage at the predetermined level being applied to the predetermined node, and an adjustment circuit configured to increase a resistance value of the variable resistor in response to a predetermined time period having elapsed since starting of generation of the output voltage.