DC Topology Circuit with Subtractor for Multi-Load Adaptability
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Solution Overview
Problem
Conventional DC topology circuits are limited to a single output load and cannot adapt to different loads when using the same connection port and communication protocol, leading to potential damage due to voltage and current differences.
Innovation Solution
A DC topology circuit incorporating a control chip with a subtractor and control module, along with field effect transistors and capacitors, which adjusts control signals to control the conduction of transistors based on input and load-rated voltage differences, allowing the circuit to operate in different modes to accommodate various loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional DC topology circuit uses a fixed buck function design, then the circuit structure is simple, but the circuit can only adapt to one output load and cannot be reused with different loads
Solution Approach 1:
The patent implements a DC topology circuit that can operate in both buck and boost modes by adding a second switch and controlling the fourth switch's conduction state. This allows the same circuit to adapt to different load requirements (different rated voltages) without needing separate circuits, thereby achieving multi-functionality and improving load adaptability while maintaining reasonable structural complexity
Solution Approach 2:
The patent uses dynamic control of the fourth switch's conduction state to transform the circuit between buck and boost modes. When the fourth switch is always conductive, the circuit operates as a buck converter; when always non-conductive, it operates as a boost converter. This dynamic switching capability enables the circuit to adapt to different load conditions, resolving the contradiction between fixed function and versatility
2Ease of operation
If different output loads use the same connection port and communication protocol, then the interface is unified and easy to operate, but voltage and current differences may damage the product
Solution Approach 1:
The patent incorporates a subtractor that calculates the difference between the input voltage and the load's rated voltage, and feeds this difference signal to the control module. The control module uses this feedback to determine the appropriate operating mode (buck or boost) and adjust the switching signals accordingly. This feedback mechanism ensures that the circuit automatically adapts to the load's voltage requirements, preventing damage from voltage/current mismatches while maintaining unified interface operation
Solution Approach 2:
The control module performs preliminary voltage comparison using the subtractor before initiating power conversion. By calculating the voltage difference in advance and determining the required operating mode beforehand, the circuit prevents potential damage from inappropriate voltage/current delivery. This preliminary action ensures safe operation before the actual power transfer occurs, resolving the contradiction between unified interface ease of use and product safety
Data Source
AI summary
The present invention provides a DC topology circuit, which provides a subtractor in the control chip and a control module which is electrically connected with the output terminal of the subtractor. The two input terminals of the subtractor are respectively inputted with the input voltage and the load-rated voltage, and the input voltage and the load-rated voltage are subtracted by the subtractor. The control module controls the conduction or not of the plurality of field effect transistors according to the operation result, so that the DC topology circuit enters the different working mode, when the load uses the same connection port and communication protocol, the DC topology circuit can supply different loads with different rated voltages, and increase the application range of the DC topology circuit.