Bidirectional DC/DC Converter Standby Voltage Stabilization
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Solution Overview
Problem
In modern urban rail transit systems, bidirectional DC/DC converters experience inherent current errors and limited sampling precision, leading to unstable bus and load voltages during standby mode, resulting in power loss due to non-constant voltage levels.
Innovation Solution
A converter system with a control module that generates first-side and second-side compensation signals based on bus and load voltages to stabilize the output current, compensating for inherent current errors and maintaining stable voltages by adjusting the reference current signal and outputting a driving signal to the converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the bidirectional converter operates in standby mode without active control, then the converter can remain idle and conserve energy, but the bus voltage and load voltage become unstable due to inherent converter losses and sampling precision limitations
Solution Approach 1:
The control module continuously monitors the bus voltage and load voltage, and adjusts the output current based on feedback signals to maintain stable voltages during standby mode. The control module generates compensation signals according to the detected voltage levels to counteract the inherent losses and maintain electrical balance.
Solution Approach 2:
The control module dynamically adjusts the output current parameter of the converter during standby mode to compensate for voltage drift. By changing the current parameter in response to voltage variations, the system maintains stable bus and load voltages without requiring full operational mode activation.
2Reliability
If the converter operates in standby mode with minimal control, then the system simplicity is maintained, but the inherent current error causes voltage drift and power loss
Solution Approach 1:
The control module implements a feedback mechanism that detects voltage levels and automatically generates compensation signals to correct current errors. This feedback-based approach improves voltage stability without requiring complex manual intervention or additional hardware components.
Solution Approach 2:
The control module autonomously monitors and corrects voltage instability by generating its own compensation signals based on detected voltage levels. The system performs self-correction of current errors without external intervention, maintaining reliability while keeping the control architecture relatively simple.
3Loss of energy
If the converter maintains zero output current in standby mode, then power loss is reduced, but the inherent current error prevents stable voltage maintenance
Solution Approach 1:
The control module adjusts the output current parameter from exactly zero to a compensated value that accounts for inherent current errors. By making precise parameter adjustments based on voltage feedback, the system maintains both low power loss and stable voltages despite measurement precision limitations.
Solution Approach 2:
The control module preemptively applies compensation signals to counteract the expected inherent current errors before they cause significant voltage drift. This preliminary anti-action approach maintains voltage stability while keeping the output current close to zero, minimizing power loss.
Data Source
AI summary
A converter system and method is provided. The converter system includes a converter and a control module. The converter is electrically connected with a DC bus and a load. The converter is configured to realize the conversion between a bus voltage of the DC bus and a load voltage of the load. The control module is electrically coupled with the converter. When the converter is in a standby mode, the control module generates a first-side compensation signal according to the bus voltage and generates a second-side compensation signal according to the load voltage. And the control module generates an instruction current signal according to the first-side compensation signal, the second-side compensation signal and a reference current signal. The control module generates the driving signal according to the instruction current signal, so as to control an output current of the converter to be stable.