Bidirectional DC/DC Converter Synchronization via Induced EMF
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Solution Overview
Problem
Existing bidirectional DC/DC converters require complex control circuits to synchronize primary and secondary circuits accurately, leading to increased size and complexity, making it difficult to manage both charge and discharge efficiently.
Innovation Solution
A power supply system with a first circuit including a battery device, switching elements, feed coils, and a driving coil that alternately turns on/off the switching elements based on the flow direction of the current, and a second circuit with feed coils and driving coils generating induced electromotive force to control the switching elements, eliminating the need for external control circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a control circuit is provided in each of the primary circuit and secondary circuit to synchronize semiconductor switches with high accuracy, then synchronization precision is improved, but device complexity and circuit configuration increase
Solution Approach 1:
The patent merges the control functions of both primary and secondary circuits into a single control circuit located in the primary circuit. This control circuit generates gate control signals for semiconductor switches in both circuits, eliminating the need for separate control circuits in each circuit while maintaining high synchronization accuracy through centralized control.
Solution Approach 2:
The patent introduces a synchronization signal as an intermediary mechanism. The control circuit in the primary circuit generates this synchronization signal based on the operating state of the primary circuit, and this signal is used to coordinate the timing of semiconductor switches in both primary and secondary circuits, achieving high-precision synchronization without complex circuit configurations.
2Adaptability or versatility
If control circuits are provided in both primary and secondary circuits to manage charge and discharge, then control capability is improved, but apparatus size increases
Solution Approach 1:
The patent combines the control functions for managing both charge and discharge operations into a single control circuit in the primary circuit. This control circuit can generate appropriate gate control signals for semiconductor switches in both primary and secondary circuits depending on the operating mode, eliminating the need for separate control circuits and reducing overall apparatus size.
Solution Approach 2:
The control circuit in the primary circuit is designed with multi-functionality to handle both charge and discharge operations. It can generate gate control signals for semiconductor switches in both primary and secondary circuits, and can adapt its control strategy based on the operating mode, thereby providing universal control capability while minimizing circuit count and apparatus size.
3Reliability
If maximum on-duty ratio of gate control signal is limited to 50% to prevent short circuit, then safety is improved, but power conversion efficiency deteriorates
Solution Approach 1:
The patent dynamically adjusts the on-duty ratio of gate control signals based on the operating mode (charge or discharge). During discharge operation, the control circuit can set the on-duty ratio to values greater than 50% to optimize power conversion efficiency, while during charge operation or when risk of short circuit exists, it limits the on-duty ratio to 50% or less to ensure safety. This dynamic adjustment resolves the contradiction between safety and efficiency.
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
This configuration allows for high-accuracy synchronization of primary and secondary circuits, reducing the system's size and complexity while improving efficiency and power saving, enabling bidirectional power feed and automatic oscillation without voltage monitoring.
Implementation Method 1
a first driving coil configured to turn on/off the first switching element in accordance with the flow direction of the feeding current, and the second circuit includes; a second feed coil and a second driving coil in which induced electromotive force is generated by the feeding current flowing through the first feed coil
Implementation Method 2
a second feed coil and a second driving coil in which induced electromotive force is generated by the feeding current flowing through the first feed coil
Data Source
AI summary
A power supply system is provided that can synchronize a primary circuit and a secondary circuit with high accuracy and are advantageous in downsizing and simplification. The system includes a first circuit including: a battery device; transistor elements to which a voltage is supplied; coil units to which a feeding current is supplied in an on state of the transistor elements; a capacitor that changes a flow direction of the feeding current; and a driving coil that turns on/off the transistor elements, and a second circuit including: coil units and a driving coil in which induced electromotive force is generated; transistor elements that are turned on/off by the induced electromotive force; and a battery device that receives supply of power in an on state of the transistor elements.