Switch Circuit Adaptive Current Protection
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Solution Overview
Problem
Conventional power supplies lack the ability to adjust current protection intervals based on varying load conditions, leading to inadequate adaptation and potential overcurrent issues.
Innovation Solution
A switch circuit comprising a first switch, a current protection component, a current detection circuit, and a controller, which generates different protection voltages based on detection voltage thresholds to selectively control the conduction and non-conduction times of the first switch, allowing for adjustable current protection intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed current protection mechanism is used in power supply, then the power supply structure is simple and easy to manufacture, but the current protection interval cannot be adjusted according to different load conditions
Solution Approach 1:
The patent implements dynamic current protection by making the current protection interval adjustable based on load conditions. The controller dynamically changes the conduction time of the first switch according to detection voltage levels, transforming a static protection mechanism into a dynamic adaptive one. This resolves the contradiction by enabling adaptability through dynamic control while maintaining a relatively simple circuit structure.
Solution Approach 2:
The patent changes the parameter of current protection interval by adjusting the conduction time of the first switch based on detection voltage. When detection voltage exceeds a threshold, the controller extends the conduction time, effectively changing the protection interval parameter. This allows the system to adapt to different load conditions without requiring a completely complex circuit redesign.
2Productivity
If the first switch conduction time is extended to adapt to heavy load conditions, then the current protection interval is increased, but the risk of overcurrent damage increases
Solution Approach 1:
The patent employs feedback control where the controller continuously monitors the detection voltage generated by the current protection component and adjusts the first switch conduction time accordingly. When detection voltage exceeds the threshold, the controller extends conduction time to increase output capability, but maintains protection by comparing voltage levels and adjusting duty cycle. This feedback mechanism allows the system to safely extend conduction time under heavy loads while preventing overcurrent damage through continuous monitoring and adaptive adjustment.
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 adaptive current protection that effectively manages current levels according to load conditions, preventing overcurrent and ensuring safe operation of power devices.
Implementation Method 1
the current protection component generates a detection voltage corresponding to a current passing through the first switch
Implementation Method 2
When the detection voltage is not greater than a first threshold, the current detection circuit generates a first voltage corresponding to the detection voltage as the protection voltage. When the detection voltage is greater than the first threshold, the current detection circuit generates a second voltage corresponding to the detection voltage as the protection voltage
Implementation Method 3
When the protection voltage is greater than a second threshold, the controller does not increase a proportion of a conduction time to a non-conduction time of the first switch
Data Source
AI summary
A switch circuit includes a first switch, a current protection component, a current detection circuit, and a controller. The first switch conducts a primary side coil. The current protection component generates a detection voltage. The current detection circuit outputs a protection voltage. When the detection voltage is not greater than a first threshold, the current detection circuit generates a first voltage corresponding to the detection voltage as the protection voltage. When the detection voltage is greater than the first threshold, the current detection circuit generates a second voltage corresponding to the detection voltage as the protection voltage, where the first voltage is different from the second voltage. The controller is suitable for making the first switch selectively conducting and not conducting. When the protection voltage is greater than a second threshold, the controller does not increase a proportion of a conduction time to a non-conduction time of the first switch.