Soft Start Circuit Constant Timing Variable Voltage
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Solution Overview
Problem
Conventional soft start circuits face the challenge of maintaining a constant soft start time while unnecessarily increasing circuit scale when trying to keep the soft start time constant irrespective of the set target output voltage.
Innovation Solution
The proposed soft start circuit generates a soft start voltage that slowly rises from a predetermined lowest value to a highest value, higher than the reference voltage, and adjusts the increment period based on the target output voltage to maintain a constant soft start time, using a logic circuit to control an m-bit digital reference signal and a DC/DC converter to generate the output voltage, thereby reducing the circuit scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the soft start circuit is designed to maintain a constant soft start time irrespective of the target output voltage, then the soft start time remains constant, but the circuit scale increases unnecessarily
Solution Approach 1:
The patent implements dynamic adjustment of the soft start time based on the target output voltage. The control circuit varies the soft start time according to the magnitude of the target output voltage, making the previously fixed parameter adaptive. This resolves the contradiction by allowing the circuit to maintain constant soft start time only when necessary while reducing circuit scale through intelligent parameter adjustment.
Solution Approach 2:
The patent changes the parameter of soft start time from a fixed value to a variable that depends on the target output voltage. By establishing a relationship between soft start time and target output voltage magnitude, the circuit optimizes its operation without requiring unnecessarily large circuit scale, thus resolving the technical contradiction.
2Reliability
If the soft start time is extended to ensure proper startup, then the startup stability improves, but the productivity decreases due to longer startup duration
Solution Approach 1:
The patent dynamically adjusts the soft start time based on the target output voltage. For smaller target voltages, the soft start time is reduced, improving productivity. For larger target voltages, the soft start time is extended to maintain reliability. This dynamic adaptation resolves the contradiction between startup stability and startup speed.
Solution Approach 2:
The patent changes the soft start time parameter from a fixed extended duration to a variable duration that scales with the target output voltage. This optimization ensures sufficient startup stability when needed while minimizing unnecessary startup time, thus improving overall productivity without sacrificing reliability.
Data Source
AI summary
A soft start circuit accepts an input of a reference voltage set arbitrarily, and generates a soft start voltage that takes a predetermined sweep time to slowly rise from a predetermined lowest value to a highest value that is higher than the reference voltage and changes in accordance with the reference voltage.