Multi-Converter Control Circuit for Balanced Power Sharing
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Solution Overview
Problem
Existing power distribution systems in multi-converter switching power supplies face challenges in managing power distribution among parallel-connected converters due to mismatched outputs, leading to inefficiencies and unreliable operation.
Innovation Solution
The implementation of integrated control circuits for each converter, which include a master control circuit and a slave control circuit, to synchronize the operation of primary and secondary switches, ensuring zero-voltage switching and adjusting ON-times to achieve balanced power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple converters are connected in parallel to meet dynamic power requirements, then power capacity and reliability are improved, but power distribution imbalance and heat dissipation issues occur
Solution Approach 1:
The master control circuit generates time indication pulse signals that provide feedback to the slave control circuit about the switching timing of the master converter. This feedback mechanism enables the slave converter to synchronize its switching operations, achieving balanced power distribution and reducing energy loss across parallel-connected converters
Solution Approach 2:
The time indication pulse signal acts as an intermediary between the master and slave control circuits. It transmits timing information that coordinates the switching operations of both converters, enabling synchronized operation and resolving power distribution imbalance without direct control intervention
2Power
If multiple converters are connected in parallel to meet dynamic power requirements, then power capacity and reliability are improved, but heat dissipation problems worsen
Solution Approach 1:
The control method ensures continuous and synchronized switching operations across both converters through time indication pulse signals. This continuous coordinated operation optimizes power conversion efficiency, reducing wasted energy and improving heat dissipation while maintaining high power capacity
Solution Approach 2:
The system dynamically adjusts the ON-time of the secondary switch based on timing information from the master converter. By changing the switching parameters in real-time, the system optimizes power distribution and reduces thermal stress on individual converters
3Productivity
If integrated control circuits are implemented to synchronize converter operation, then power distribution efficiency is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into a master control circuit and a slave control circuit. Each circuit has specific, simplified functions: the master generates time indication pulse signals, while the slave receives and acts on them. This segmentation improves power distribution efficiency while keeping individual circuit complexities manageable
Solution Approach 2:
The integrated control circuits are designed with multi-functionality to handle multiple tasks within a unified structure. The circuits perform switching control, timing synchronization, and power distribution management, reducing the need for separate dedicated circuits and thereby managing overall system complexity
4Reliability
If zero-voltage switching is achieved through synchronized control, then reliability and efficiency are improved, but control precision requirements increase
Solution Approach 1:
The master control circuit generates time indication pulse signals in advance of the actual switching event. This preliminary timing signal allows the slave control circuit to prepare for synchronized switching, ensuring zero-voltage conditions are met before switching occurs, thereby improving reliability while managing precision requirements
Data Source
AI summary
An integrated control circuit for a multi-converter switching power supply. Each switching converter has a primary switch and a secondary switch. The secondary switch is turned on twice in a switching cycle. A master integrated control circuit has a transmission terminal for providing a time indication pulse signal. A slave integrated control circuit has a transmission terminal for receiving the time indication pulse signal and turns on its secondary switch for a second ON-time. The second ON-time is adjusted based on the time indication pulse signal, a third duration between a start point when the primary switch is turned on and a stop point when a current flowing through the secondary switch crosses zero, and a fourth duration between the stop point and a subsequent start point.