DCDC Converter Control for Auxiliary Voltage Stability
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Solution Overview
Problem
In systems with multiple DCDC converters connected in parallel, voltage fluctuations in auxiliary device systems occur due to load changes, leading to malfunctions such as reduced lamp brightness and wiper speed, as existing control methods prioritize current output from higher voltage converters after their maximum value is reached, causing temporary voltage drops.
Innovation Solution
An electric power supplying device with sensing sections for output currents from DCDC converters and an auxiliary device battery, and a control section that adjusts the output of the second DCDC converter based on sensed currents to prevent voltage fluctuations, ensuring proportional current distribution and prioritizing the first DCDC converter's operation in high-efficiency regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple DCDC converters are connected in parallel with priority control to higher voltage converters, then current output capability is improved, but voltage stability deteriorates due to temporary voltage drops when load increases
Solution Approach 1:
The control section activates the second DCDC converter in advance before the first DCDC converter reaches its maximum output, rather than waiting for voltage drops to occur. This preliminary action ensures that the second converter is already contributing current when load increases, preventing voltage instability while maintaining improved power output capability
Solution Approach 2:
The control section continuously monitors the output currents from both DCDC converters and the auxiliary device battery, using this feedback information to dynamically adjust the output of the second DCDC converter. This feedback mechanism ensures optimal current distribution and maintains voltage stability across varying load conditions
2Device complexity
If the second DCDC converter is activated only after the first converter reaches maximum output, then device complexity is reduced, but voltage stability deteriorates during high load transitions
Solution Approach 1:
The control section activates the second DCDC converter in advance before the first DCDC converter reaches its maximum output, rather than waiting for voltage drops to occur. This preliminary action ensures that the second converter is already contributing current when load increases, preventing voltage instability while maintaining improved power output capability
Data Source
AI summary
An electric power supplying device including: a first sensing section that senses a first output current from a first DCDC converter provided between a high-voltage system and an auxiliary device system; a second sensing section that senses a second output current from a second DCDC converter provided between the high-voltage system and the auxiliary device system; a third sensing section that senses a third output current from an auxiliary device battery connected to the auxiliary device system; and a control section that controls output of the second DCDC converter on the basis of results of sensing of output currents by the first sensing section, the second sensing section and the third sensing section.