Non-Isolated DC/DC Converter With Oscillation Suppression Module
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Solution Overview
Problem
Large power non-isolated DC/DC power converters with single-stage architecture face issues of current oscillation and current circulation between modules, leading to inefficiency and non-uniform power distribution, particularly in medium voltage input systems.
Innovation Solution
A non-isolated DC/DC power converter with a power module and an oscillation suppression module, where the oscillation suppression module includes a second power conversion circuit connected in parallel to the input of the first power conversion circuit, and a bidirectional DC/DC conversion circuit to suppress oscillations and balance currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single-stage architecture is used in DC/DC power conversion modules, then efficiency is improved and cost is reduced, but current oscillation occurs at the input terminal during system disturbance
Solution Approach 1:
An oscillation suppression module is introduced as an intermediary component between the power supply and the single-stage DC/DC converter. This module includes a bidirectional DC/DC conversion circuit that actively compensates for current oscillations by injecting counter-phase currents, thereby stabilizing the input current without requiring passive damping circuits that would increase power loss
Solution Approach 2:
The oscillation suppression module dynamically adjusts the impedance characteristics of the input terminal by controlling the bidirectional DC/DC conversion circuit. By changing the equivalent impedance parameters in response to detected oscillations, the system suppresses current oscillation while maintaining the efficiency benefits of the single-stage architecture
2Power
If multiple DC/DC power conversion modules are connected in parallel to increase output power, then power capacity is improved, but current circulation occurs between modules causing non-uniform power distribution
Solution Approach 1:
The oscillation suppression module acts as a mediator between parallel-connected DC/DC modules by providing individual current regulation for each module. The bidirectional DC/DC conversion circuit detects and compensates for current circulation between modules, ensuring uniform current distribution while maintaining the ability to scale output power through parallel connections
Solution Approach 2:
The system implements feedback control through the oscillation suppression module, which continuously monitors the input current of each parallel-connected DC/DC module. Based on this feedback, the bidirectional DC/DC conversion circuit adjusts the current distribution to eliminate circulation and achieve uniform power sharing among modules
Data Source
AI summary
The invention discloses a non-isolated DC/DC power converter and a power conversion apparatus. The non-isolated DC/DC power converter comprises a power module comprising a first power conversion circuit, the first power conversion circuit being a non-isolated DC/DC conversion circuit, a first output end of the first power conversion circuit is connected with a first inductor, and a second output end of the first power conversion circuit is connected with a second inductor; and an oscillation suppression module comprising a second power conversion circuit, a first terminal of the second power conversion circuit coupled in parallel to an input end of the first power conversion circuit, a first terminal current of the second power conversion circuit being in phase with at least partial of AC components of an input voltage of the oscillation suppression module, and the second power conversion circuit being a bidirectional DC/DC conversion circuit.