Parallel Voltage Regulator Share Control With Saturation Prevention
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Solution Overview
Problem
Existing parallel-operating voltage regulators face challenges in seamless load current sharing and stability due to fluctuations in input voltage and load requirements, leading to inefficiencies and potential loss of controllability.
Innovation Solution
The implementation of control circuitry with separate share control circuits for LDO and DC/DC regulators, along with saturation prevention mechanisms, ensures accurate load sharing and stability by decoupling the control loops and preventing saturation, allowing for efficient operation across varying load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple voltage regulators are used in parallel to drive a load, then the load current capacity is increased, but the operating complexity and difficulty of controlling load current sharing increases
Solution Approach 1:
The patent introduces a current sensing circuit that acts as an intermediary between the parallel voltage regulators and the control system. This circuit senses the output current of each regulator and converts it into a controllable signal, simplifying the control mechanism by providing a direct feedback path without requiring complex communication or coordination protocols between regulators
Solution Approach 2:
The patent implements a feedback mechanism where the sensed current from each voltage regulator is fed back to its respective control circuit. This automatic feedback loop enables each regulator to self-adjust its output based on the actual current being delivered, eliminating the need for external complex control systems to manage load sharing
2Device complexity
If voltage regulators operate in parallel without separate control circuits, then the device complexity is reduced, but the load current sharing accuracy deteriorates
Solution Approach 1:
The patent divides the control function into separate control circuits for each voltage regulator. Each regulator has its own dedicated control circuit that independently manages its output, allowing for precise individual control while maintaining overall system simplicity. This segmentation enables accurate load current sharing without requiring a monolithic complex control system
3Speed
If the control loop is tightly coupled for fast response, then the transient response is improved, but the stability and controllability deteriorates due to saturation
Solution Approach 1:
The patent implements saturation prevention circuits that act in advance to counteract potential saturation conditions. These circuits monitor the control signals and take preliminary corrective action before saturation occurs, preventing the loss of controllability while maintaining the ability to respond quickly to transient conditions
Solution Approach 2:
The patent introduces protective circuitry that cushions against saturation effects before they can compromise system stability. By providing this protective mechanism in advance, the system can operate with tight coupling for fast transient response without risking the stability and controllability that would be lost under saturation conditions
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.