Bidirectional DC/DC Converter Merging Charge and Discharge Circuits
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Solution Overview
Problem
Conventional DC/DC converters for rechargeable batteries are complex and costly due to their need for separate charging and discharging circuits, which increases component count and complexity.
Innovation Solution
A bi-directional DC/DC converter design incorporating a push-pull or full bridge circuit, transformer, half bridge circuit, and rectifying circuit with a switch to connect the transformer's secondary side to the rectifying circuit, allowing for efficient bi-directional power transfer with fewer components and lower costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional DC/DC converter uses separate charging and discharging circuits, then the charge and discharge processes can be achieved, but the device complexity and component count increase
Solution Approach 1:
The patent merges the charging and discharging circuits into a single bi-directional DC/DC converter. The converter uses a single power stage with switches that can operate in two modes: charging mode where power flows from the battery to the DC bus, and discharging mode where power flows from the DC bus to the battery. This eliminates the need for separate charging and discharging circuits, reducing device complexity while maintaining full charge and discharge capability.
Solution Approach 2:
The bi-directional DC/DC converter is designed as a universal power conversion device that can perform both charging and discharging functions. The converter uses a single power stage with controllable switches that can operate in two directions, making the device multi-functional. This universal design reduces the overall component count and simplifies the circuit structure compared to having separate dedicated charging and discharging circuits.
2Adaptability or versatility
If a conventional DC/DC converter uses separate charging and discharging circuits, then the charge and discharge processes can be achieved, but the cost increases due to more components
Solution Approach 1:
The patent merges the charging and discharging circuits into a single bi-directional DC/DC converter. The converter uses a single power stage with switches that can operate in two modes: charging mode where power flows from the battery to the DC bus, and discharging mode where power flows from the DC bus to the battery. This eliminates the need for separate charging and discharging circuits, reducing device complexity while maintaining full charge and discharge capability.
Solution Approach 2:
The bi-directional DC/DC converter is designed as a universal power conversion device that can perform both charging and discharging functions. The converter uses a single power stage with controllable switches that can operate in two directions, making the device multi-functional. This universal design reduces the overall component count and simplifies the circuit structure compared to having separate dedicated charging and discharging circuits.
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 bi-directional DC/DC converter achieves efficient charge and discharge processes with reduced components and lower costs, enabling effective power transfer between the battery and external circuits while minimizing component complexity and cost.
Implementation Method 1
a transformer, a primary side of which is connected to an output of the push-pull circuit or the full bridge circuit
Data Source
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AI summary
The present invention provides a bi-directional DC/DC converter and a control method thereof. The bi-directional DC/DC converter comprises a push-pull circuit, a chargeable and dischargeable device, a transformer, a half bridge circuit, a rectifying and filtering circuit and a first switch. The primary side of the transformer is connected to an output of the push-pull circuit. The output of the rectifying and filtering circuit is connected across a bridge arm of the half bridge circuit. The first switch is configured to connect the secondary side of the transformer to an input of the rectifying and filtering circuit, or to connect a part of windings of the secondary side of the transformer to an output of the half bridge circuit while disconnecting the part of windings of the secondary side of the transformer from two terminals of the input of the rectifying and filtering circuit. The bi-directional DC/DC converter of the present invention has fewer components and is low in cost.