Bidirectional DC/DC Converter With Transformer Reset Circuit
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Solution Overview
Problem
Conventional DC/DC converters lack the capability for bidirectional energy flow, with energy transmission only possible from the phase-shift full-bridge circuit to the synchronous rectifier circuit, limiting their applicability.
Innovation Solution
A bidirectional DC/DC converter is designed with a transformer having two windings and a reset circuit, allowing energy to be transmitted in both directions by alternating the states of the reset circuit and windings, and utilizing a central tap to divide the second winding into sub-windings for active clamping and resonant resetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional DC/DC converter with phase-shift full-bridge circuit and synchronous rectifier is used, then energy can be transmitted from the full-bridge side to the rectifier side, but bidirectional energy transmission cannot be implemented
Solution Approach 1:
The patent divides the single transformer winding into two separate windings (first winding and second winding) with different configurations. The first winding is optimized for forward power transmission while the second winding is designed for reverse power transmission and reset functions, enabling bidirectional operation through segmented winding structures
Solution Approach 2:
The converter achieves multi-functionality by making the same circuit topology capable of both forward and reverse power transmission. The first terminal circuit and second terminal circuit can alternatively function as input or output sides depending on the operating mode, eliminating the need for physically separate forward and reverse converters
2Adaptability or versatility
If the second winding is used for bidirectional power transmission, then energy flow flexibility improves, but the winding requires resetting that complicates the circuit
Solution Approach 1:
The patent combines the reset function with the second winding structure by incorporating a reset circuit that shares components with the power transmission path. The reset circuit merges the clamping function and energy dissipation function into a unified structure that operates seamlessly with the bidirectional power flow
Solution Approach 2:
The patent introduces a clamping circuit as an intermediary between the second winding and the rest of the system. This clamping circuit acts as a mediator that manages the energy in the second winding during switching transitions, enabling safe bidirectional operation without requiring complex isolation between power transmission and reset functions
3Adaptability or versatility
If a reset circuit is added to enable bidirectional operation, then energy transmission capability improves, but the device complexity and cost increase
Solution Approach 1:
The reset circuit components are designed to serve multiple functions: the clamping circuit not only protects against voltage spikes but also facilitates energy recovery, while the reset winding serves both as a power transmission path and an energy dissipation path. This multi-functionality reduces the need for separate dedicated reset components
Solution Approach 2:
The patent implements energy recovery by capturing the energy stored in the second winding during the reset phase and redirecting it to useful purposes rather than simply dissipating it as heat. The clamping circuit recovers energy that would otherwise be lost, improving overall efficiency while enabling bidirectional operation
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
Enables bidirectional energy transmission, improving energy utilization and reducing the need for pre-charging circuits, thereby lowering costs and enhancing efficiency in applications like vehicle power supply systems.
Implementation Method 1
The phase-shift full-bridge circuit converts a direct current provided by the direct current power into an alternating current, and applies the alternating current to a primary-side coil of the transformer. A secondary-side coil of the transformer induces another alternating current.
Implementation Method 2
the reset circuit and the second winding perform resonant resetting, so that the energy of the DC/DC converter may be bidirectionally transmitted
Data Source
AI summary
A bidirectional DC/DC converter includes a first terminal circuit, a transformer, a second terminal circuit, and a reset circuit, and the transformer includes a first winding and a second winding. The first terminal circuit is coupled to the first winding, and the second terminal circuit and the reset circuit are coupled to the second winding. In a first time period in which the bidirectional DC/DC converter is in a second working state, the second terminal circuit transmits a second alternating current to the first terminal circuit by using the second winding and the first winding; and in a second time period in which the bidirectional DC/DC converter is in the second working state, the reset circuit is in a conducted state, to reset the second winding.