DC-DC Converter Soft-Start Chattering Elimination
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Solution Overview
Problem
Existing DC-DC converter designs face challenges in effectively eliminating chattering in operation control signals, which complicates circuit design due to the need for pre-determination of circuit constants suitable for various chattering parameters.
Innovation Solution
A DC-DC converter with a soft-start control circuit that detects the presence of a soft-start signal and controls output voltage based on this detection, disregarding chattering influences during soft-start and stop operations, thereby preventing the impact of chattering on the converter's operation without requiring pre-determined circuit constants for chattering elimination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chattering elimination circuit using Schmitt trigger and low-pass filter is used, then chattering can be eliminated, but circuit design becomes complicated due to need for pre-determination of circuit constants
Solution Approach 1:
The patent extracts the harmful chattering component from the operation control signal by introducing a detection circuit that identifies when chattering occurs. The control circuit then excludes or ignores the operation control signal during chattering periods, effectively removing the harmful effect without requiring complex filtering circuits with pre-determined constants.
Solution Approach 2:
The patent introduces a detection circuit as an intermediary between the operation control signal and the DC-DC converter control circuit. This detection circuit monitors the operation control signal for chattering conditions and provides control signals to the charging/discharging control circuit, enabling the system to respond appropriately without direct complex filtering.
2Reliability
If low-pass filter is used to smooth operation control signal, then chattering is reduced, but circuit constants must be pre-determined which complicates design
Solution Approach 1:
The detection circuit automatically detects chattering conditions in the operation control signal and generates appropriate control signals without requiring external design intervention. The circuit self-adjusts by monitoring signal characteristics and activating soft-start or stop operations when chattering is detected, eliminating the need for pre-determined filter constants.
Solution Approach 2:
The patent dynamically changes the operational parameters of the DC-DC converter based on detected chattering conditions. During detected chattering periods, the control circuit modifies the charging/discharging behavior of the capacitor CS, effectively changing the system's response characteristics without requiring fixed pre-determined filter parameters.
Data Source
AI summary
According to one aspect of the invention, a DC-DC converter including a soft-start function of a soft start in response to a soft-start signal, comprises: a detection circuit that detects whether the soft-start signal is active at an end of a soft-start operation; and an output voltage control circuit that controls an output voltage based on detection result of the detection circuit.