Frequency Controller Multi-Stage Startup Transition

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Solution Overview

Problem

Current frequency controllers for switching power converters fail to balance startup speed and electrical stress, leading to high electrical stress and audible noise during startup, which affects the overall performance of the converter.

Innovation Solution

A multi-stage frequency control scheme is implemented, using distinct frequencies for startup, operation, and transition stages to optimize electrical stress and output ramping performance, including a startup signal generator, operation signal generator, and transition signal generator connected to the output circuit via separate lines, with timers and switches to manage signal transitions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If high frequency is used during startup to speed up output voltage ramping, then startup speed is improved, but electrical stress and audible noise increase

Engineering Contradiction:

Improvestartup speedVSAvoidelectrical stress and audible noise

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The frequency control is divided into three distinct stages: startup stage (lower frequency to reduce electrical stress and audible noise), transition stage (discretely varied frequencies for controlled ramping), and operation stage (normal frequency for full performance). This segmentation allows optimization of each stage independently, resolving the contradiction between startup speed and electrical stress.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The frequency controller dynamically adjusts the operating frequency based on the converter's startup progress. During startup, frequency is kept lower; during transition, frequency varies discretely; during normal operation, frequency returns to normal levels. This dynamic adaptation optimizes both startup performance and electrical stress management.

Inventive Principle:

Principle #15Dynamics

2Reliability

If multi-stage frequency control is implemented, then electrical stress and output ramping performance are optimized, but device complexity increases

Engineering Contradiction:

Improveelectrical stress control and output ramping performanceVSAvoidfrequency control structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Multiple frequency control functions (startup frequency generation, transition frequency variation, operation frequency generation) are merged into a single integrated frequency controller device. This consolidation achieves sophisticated multi-stage control while avoiding the complexity of multiple separate control devices, resolving the contradiction between performance optimization and device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11277069B2Frequency controller

Publication Date: 2022.03.15 HYPOWER MICROELECTRONICS (WUXI) CO LTD

AI summary

A frequency controller for operating a switching power converter is provided. The frequency controller includes an output circuit, an operation signal generator, and a transition signal generator. The output circuit is to connect to a switching power converter. The startup signal generator is connected to the output circuit via a first connection line and configured to generate a startup signal with a startup-frequency during a startup period of the switching power converter. The operation signal generator is connected to the output circuit via a second connection line and configured to generate an operation signal with an operation-frequency during an operation period of the switching power converter. The transition signal generator is connected to the output circuit via a third connection line and configured to generate a transition signal with varied frequencies during a transition period between the startup period and the operation period.