Bidirectional DC/DC Converter Phase Shift Control for Stable Activation
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Solution Overview
Problem
Existing power conversion devices using bidirectional DC/DC converters experience voltage fluctuations leading to overvoltage or overcurrent due to differences between the capacitor voltage and battery voltage primary-side conversion values during activation.
Innovation Solution
A control circuit implements phase shift controls to manage the application of voltages to the primary and secondary windings of the transformer, adjusting the phase shift amount based on capacitor and battery voltage relationships to stabilize output power and prevent overvoltage or overcurrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bidirectional DC/DC converter is activated without phase shift control, then the power conversion device can operate simply, but voltage fluctuations occur leading to overvoltage or overcurrent
Solution Approach 1:
The control circuit performs preliminary assessment of capacitor voltage relative to battery voltage primary-side conversion value before activation, and pre-establishes the appropriate phase shift control mode (first or second) to prevent voltage fluctuations before they occur
Solution Approach 2:
The control circuit continuously monitors capacitor voltage and compares it with battery voltage primary-side conversion value, using this feedback to dynamically adjust phase shift control signals and maintain voltage stability during operation
2Reliability
If phase shift control is implemented to prevent overvoltage or overcurrent, then voltage stability is improved, but control complexity increases
Solution Approach 1:
The control circuit dynamically adjusts the phase shift amount between primary and secondary sides based on real-time voltage conditions, transitioning between different phase shift control modes as needed to maintain optimal operation
Solution Approach 2:
The control circuit modifies the phase shift parameter (time delay or angle) between primary and secondary switching signals to control power flow and prevent overvoltage or overcurrent conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The phase shift controls effectively reduce output power fluctuations, suppressing voltage instability and preventing overcurrent or overvoltage in the power conversion device.
Implementation Method 1
a transformer including a primary-side winding and a secondary-side winding... converting an input voltage, input to the primary-side full-bridge circuit, into an output voltage, output from the secondary-side full-bridge circuit
Data Source
AI summary
A control circuit performs at least one of a first phase shift control and a second phase shift control. The first phase shift control outputs a primary-side control signal so that a positive voltage is applied to a primary-side winding, and then outputs a secondary-side control signal so that a positive voltage is applied to a secondary-side winding when the voltage of the capacitor is higher than a battery voltage primary-side conversion value during activation of a bidirectional DC/DC. The second phase shift control outputs the secondary-side control signal so that a positive voltage is applied to the secondary-side winding, and then outputs the primary-side control signal so that a positive voltage is applied to the primary-side winding.