Parallel Voltage Regulator Control for Stable Load Sharing
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Solution Overview
Problem
Existing parallel-operating voltage regulators face challenges in seamless load current sharing, leading to increased operational complexity and inefficiency, particularly when fluctuating input voltages are encountered.
Innovation Solution
A control circuitry system is introduced that includes share control circuits and saturation prevention circuits to manage load current sharing between LDO and DC/DC regulators, ensuring accurate load estimation and preventing saturation, thereby stabilizing output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple voltage regulators are used in parallel to drive a load, then the power supply capacity is improved, but the operational complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the control circuitry continuously monitors the output voltage and load current, then adjusts the control signals to the LDO and DC/DC regulators accordingly. This closed-loop feedback system automatically balances the load sharing between parallel regulators, resolving the complexity issue while maintaining enhanced power capacity.
Solution Approach 2:
The control circuitry acts as an intermediary between the parallel regulators and the load. It receives monitoring signals from both regulators, processes the information about their respective output characteristics, and generates appropriate control signals to balance their operation. This intermediary layer simplifies the overall system operation by centralizing the coordination function.
2Device complexity
If parallel voltage regulators operate without precise load sharing control, then the device complexity is reduced, but the operational efficiency deteriorates
Solution Approach 1:
The control circuitry employs feedback loops that monitor the output voltage and individual regulator performance, then automatically adjust control signals to optimize load distribution. This feedback mechanism ensures high operational efficiency without requiring complex manual intervention or overly sophisticated control architecture.
Solution Approach 2:
The system implements self-service through automatic load balancing where the control circuitry autonomously adjusts the operating points of parallel regulators based on real-time conditions. The regulators essentially self-regulate their contribution to the total load through the control signals generated by the monitoring circuitry, eliminating the need for external complex control systems.
3Ease of operation
If load current sharing between parallel regulators is not precisely controlled, then the ease of operation is improved, but the output voltage stability deteriorates
Solution Approach 1:
The control circuitry continuously monitors the combined output voltage of parallel regulators and adjusts control signals to maintain voltage stability. This feedback mechanism automatically compensates for variations in individual regulator performance or input voltage changes, ensuring stable output without requiring complex manual adjustment procedures.
Solution Approach 2:
The control circuitry serves as an intermediary that coordinates the operation of parallel regulators to maintain output voltage stability. It processes information about individual regulator outputs and generates balancing control signals, thereby ensuring stable combined output while keeping the system easy to operate through centralized automatic control.
Data Source
AI summary
A power supply system may include multiple DC-to-DC (direct current) voltage regulators coupled in parallel to a load, and control circuitry to control the parallel-operating regulators. The control circuitry may include a first share control circuit, a second share control circuit, and a voltage regulation circuit. The first and second share control circuits may operate together with the voltage regulation circuit to control, respectively, the parallel-operating regulators to regulate a common output voltage. Additionally, first and second share control circuits may operate together with the voltage regulation circuit to control respective share of the load current by the parallel-operating regulators.