Capacitor Voltage Detection for Short-Circuit Switch Protection
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Solution Overview
Problem
Existing electronic devices with step-up or step-down circuits face damage due to uncontrolled large currents during short-circuit conditions, as the chip cannot immediately turn off the switch, leading to potential component damage.
Innovation Solution
A method involving a detection and control unit that charges a capacitor and compares its voltage with a reference value, turning off switches to prevent current flow when a short circuit is detected, thereby protecting the circuit components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the chip detects a short-circuit condition, then the short-circuit can be identified, but the chip cannot immediately turn off the switch causing large current to damage components
Solution Approach 1:
The patent applies preliminary action by using a detection circuit that proactively monitors the voltage across the switch before a short-circuit causes damage. The detection circuit continuously checks whether the voltage equals the input voltage (indicating a short-circuit condition), and if detected, immediately controls the switch to disconnect. This proactive monitoring and immediate response mechanism resolves the contradiction by enabling both reliable detection and fast response, preventing the delay that would otherwise allow large currents to damage components.
2Ease of operation
If a switch is provided between input end and output end of step-up or step-down circuit, then the circuit can be controlled to operate, but large current can still flow during short-circuit causing component damage
Solution Approach 1:
The patent implements feedback by creating a closed-loop control system where the detection circuit continuously monitors the voltage across the switch and feeds this information back to the control unit. When the detection circuit detects that the voltage equals the input voltage (indicating a short-circuit), it immediately feeds this signal back to control the switch disconnecting. This feedback mechanism enables the circuit to automatically respond to short-circuit conditions, maintaining ease of operation while preventing large current damage through real-time monitoring and immediate corrective action.
3Extent of automation
If the chip controls the switch in step-up or step-down circuit, then the circuit operation can be managed, but the response time is insufficient to prevent component damage during short-circuit
Solution Approach 1:
The patent applies preliminary action by implementing a dedicated detection circuit that continuously monitors the switch voltage in advance, ready to detect short-circuit conditions immediately when they occur. This preliminary monitoring mechanism eliminates the response delay inherent in chip-based control by having the detection circuit prepared and actively watching for fault conditions before they cause damage. The immediate detection and response capability maintains automatic control while eliminating the time loss that would otherwise allow component damage to occur.
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 method effectively prevents damage by detecting short circuits and controlling switch states, reducing the risk of component failure in electronic devices with step-up or step-down circuits.
Implementation Method 1
providing a first current source electrically connected to the capacitor through a second switch; providing a detection and control unit to turn on the second switch at a first time point so as to enable the first current source to charge the capacitor
Data Source
AI summary
A method for protecting a circuit includes steps of: providing a first current source connected to a capacitor of the circuit through a second switch; providing a detection and control unit for turning on the second switch at a first time, and let the first current source to charge the capacitor; detecting a voltage value of the capacitor by the detection and control unit; wherein when the voltage value is greater than or equal to a reference voltage value, the detection and control unit turns off the second switch and turns on a first switch of the circuit, and when the voltage value is lower than the reference voltage value, the detection and control unit turns off the second switch and continue turns off the first switch.