Synchronous Rectification Apparatus Eliminating Time Sequence Deviation
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Solution Overview
Problem
Existing synchronous rectifier circuits face inefficiencies due to time sequence deviations between alternating currents and control signals, leading to increased area occupation and costs in power supply apparatuses.
Innovation Solution
A synchronous rectification apparatus that uses a driver unit to control rectifier and free-wheeling transistors with control signals generated by a secondary-side winding and mutual inductance between the driver unit and the output inductor, eliminating time sequence differences and optimizing transformation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an independent isolation circuit is used to generate control signals for the driver chip, then the rectification function can be implemented, but the area occupied increases and time sequence deviation occurs between the alternating current and control signal
Solution Approach 1:
The patent combines the isolation circuit function with the secondary-side winding of the transformer. The control signals are generated directly on the secondary side through the transformer's magnetic coupling, eliminating the need for a separate independent isolation circuit. This merging of functions reduces the component count and occupied area while maintaining the rectification capability.
Solution Approach 2:
The secondary-side winding of the transformer serves multiple functions: it provides voltage transformation and simultaneously generates the control signals for the driver chip through magnetic coupling. This multi-functionality eliminates the need for dedicated isolation circuits, reducing both area and component complexity.
2Reliability
If an independent isolation circuit is used to generate control signals, then the rectification control can be achieved, but time sequence deviation occurs between the alternating current and control signal affecting transformation efficiency
Solution Approach 1:
The control signal generation is merged with the transformer's secondary-side winding, ensuring that the control signals are generated in direct synchronization with the alternating current. This eliminates time sequence deviation because both signals originate from the same magnetic coupling event, thereby improving transformation efficiency.
Solution Approach 2:
The transformer provides inherent feedback by coupling the primary-side switching actions to the secondary-side through magnetic fields. This automatic feedback mechanism ensures that control signals are generated in precise synchronization with the alternating current, eliminating time sequence deviations and improving transformation efficiency.
3Reliability
If more electric components are used for isolation and control, then the rectification control can be achieved, but the costs increase
Solution Approach 1:
The patent merges multiple functions (isolation, voltage transformation, and control signal generation) into the transformer structure itself. By using the secondary-side winding to generate control signals through magnetic coupling, the design eliminates the need for separate isolation circuits and associated components, thereby reducing component count and manufacturing costs while maintaining reliable rectification control.
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 approach enhances transformation efficiency, reduces the number of electric components and area occupied by the power supply, and lowers costs by synchronizing control signals with alternating currents.
Implementation Method 1
a driver unit controls a rectifier transistor and a free-wheeling transistor in a rectifier unit according to a first control signal generated by a secondary-side winding of a transformer unit
Implementation Method 2
a second control signal generated by mutual inductance between the driver unit and an output inductor of the filter unit
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention discloses a synchronous rectification apparatus and a synchronous rectification power supply, and relates to the field of power generation and transformation, and is designed to solve the problem that an extra isolation circuit increases costs and the problem that transformation efficiency is reduced by a time sequence difference between a control signal in the rectification part and an alternating current generated on a secondary side. A synchronous rectification apparatus includes a transformer unit, a primary-side switching transistor, a rectifier unit, a driver unit, a filter unit, and a clamp unit, where the first end of a primary-side winding of the transformer unit is connected to an input end, a second end of the primary-side winding is connected to the primary-side switching transistor and the clamp unit, and a secondary-side winding of the transformer unit is connected to the rectifier unit and the driver unit; the rectifier unit is connected to the driver unit and the filter unit; a first end of an output inductor in the filter unit is connected to an output end; and mutual inductance occurs between the output inductor and a first auxiliary winding in the driver unit.