Multi-Phase Switching Control Circuit With Light-Load Slave Shutdown
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High current demand in power converters decreases power efficiency, with power loss exponentially proportional to switching current, necessitating improved switching control circuits to reduce power consumption and enhance efficiency.
Innovation Solution
A switching control circuit for multi-channels and multi-phases power converters operating in continuous current mode, featuring a master control circuit and a slave control circuit that generate switching signals based on input and output voltages, current-sense signals, and a multiplier signal, with the ability to disable the slave circuit at light-load conditions for power saving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multi-phases technologies are used to reduce current ripple and spread switching noise, then power efficiency is improved, but device complexity increases due to multiple control circuits
Solution Approach 1:
The control circuit is divided into a master control circuit and multiple slave control circuits. The master control circuit generates a first switching signal and a multiplier signal, while each slave control circuit generates corresponding switching signals based on the multiplier signal. This segmentation allows the system to achieve multi-phase switching for reduced current ripple while distributing the control complexity across modular units.
Solution Approach 2:
The slave control circuits are designed with multi-functionality to perform multiple tasks: generating switching signals based on the multiplier signal, synchronizing with the master control circuit, and automatically disabling themselves under light-load conditions. This universal design reduces the need for separate dedicated circuits for each function, thereby managing complexity while maintaining efficiency benefits.
2Loss of energy
If slave control circuit remains active to maintain multi-phase operation, then current ripple is reduced, but power consumption increases
Solution Approach 1:
The slave control circuits dynamically adjust their operational state based on load conditions. Under heavy-load conditions, the slave circuits remain active to provide multi-phase operation and reduce current ripple. Under light-load conditions, the slave circuits automatically disable themselves to reduce power consumption. This dynamic adaptation resolves the contradiction between maintaining ripple reduction and minimizing power consumption.
Solution Approach 2:
The system changes the operational parameter of the slave control circuits from active to disabled state based on load detection. The master control circuit monitors load conditions and controls the enable/disable state of slave circuits accordingly. This parameter change allows the system to optimize the trade-off between current ripple reduction and power consumption based on real-time operating conditions.
Data Source
AI summary
A switching control circuit for multi-channels and multi-phases power converter according to the present invention comprises a master control circuit and a slave control circuit. The master control circuit generates a multiplier signal in response to an input voltage and an output voltage of the power converter, and generates a first switching signal to switch a first inductor of the power converter in accordance with the multiplier signal and the first-current signal generated by a first current-sense device. The slave control circuit generates a second switching signal to switch a second inductor of the power converter in accordance with the multiplier signal, the first switching signal and a second-current signal generated by a second current-sense device. Once the power converter is at light-load, the multiplier signal is disabled to turn off the second switching signal to turn off the slave control circuit for power saving of the power converter.