Parallel Power Balancing via Common Voltage Bus
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Solution Overview
Problem
Existing systems for connecting hydraulic generators in parallel to supply power to an aircraft power system face challenges in balancing power distribution, as they require DC/DC voltage converters with complex regulation loops, which can lead to inefficiencies and instability, especially when handling multiple generators.
Innovation Solution
A device with a simple and stable regulation loop using transconductance amplifiers connected in parallel, where each converter cell has a switch controlled by a comparator receiving a sawtooth ramp and a control amplifier, with the positive inputs of control amplifiers directly connected to transconductance amplifier outputs and receiving output voltage and reference voltage, allowing for proportional current distribution without the need for diodes or resistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If DC/DC voltage converters with regulation loops are used to connect generators in parallel, then power distribution is achieved, but system complexity and instability increase
Solution Approach 1:
The system divides the power distribution task into independent converter modules, each with its own control amplifier and transconductance amplifier. These modular segments can be connected in parallel without requiring complex centralized regulation loops, as each module autonomously contributes to the overall power distribution through its simplified control circuitry.
Solution Approach 2:
The invention extracts and eliminates the complex regulation loops from the system architecture. By using transconductance amplifiers that directly respond to voltage differences without requiring elaborate feedback regulation, the patent removes the destabilizing element while preserving the essential power distribution function.
2Power
If multiple generators are connected in parallel to supply power, then power capacity increases, but balancing power distribution becomes difficult
Solution Approach 1:
The positive inputs of all control amplifiers are connected together to a common voltage bus, merging the control signals from multiple generators. This common connection point automatically balances power distribution by equalizing the voltage reference for all converters, allowing multiple generators to work together seamlessly without complex balancing mechanisms.
Solution Approach 2:
The common voltage bus acts as an intermediary that mediates between multiple generators and the load. By providing a shared reference voltage to all control amplifiers, this intermediate element automatically balances the power contribution from each generator based on its capacity and operational status, eliminating the need for complex active balancing control.
3Productivity
If complex regulation loops are used for converter control, then power conversion is achieved, but stability and fault tolerance decrease
Solution Approach 1:
The system uses simple voltage feedback through the common bus connection rather than complex current or power feedback loops. Each control amplifier receives the common bus voltage and automatically adjusts its switching duty cycle to maintain proper power conversion, providing inherent stability without requiring elaborate feedback regulation that could introduce instability or fail under fault conditions.
Data Source
AI summary
A device for balancing power generators, including a plurality of converters each including an elementary conversion cell with a switch driven by a comparator that receives a ramp on one input thereof and, on another input, a voltage from a driving amplifier wherein the driving amplifiers receive on their negative input an image of the cell current and have their positive input connected to an adjustment loop including a common path CS_Bus, and wherein the CS_Bus path directly connects the positive inputs of the driving amplifiers to the outputs of transconductance amplifiers associated with the elementary conversion cells.