DC Voltage Supply Circuit State Holding Mechanism
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Solution Overview
Problem
Existing direct-current voltage supply circuits fail to prevent automatic resumption of voltage supply after abnormal heating is detected, leading to potential further damage to the load or the circuit, as the positive temperature coefficient thermistor naturally cools down and decreases in resistance.
Innovation Solution
A direct-current voltage supply circuit is designed with a state holding circuit that remains in a cutoff state even after the temperature detector cools down, requiring a reset circuit to bring the state holding circuit back to a connected state before resuming voltage supply, ensuring that the supply remains stopped until the cause of abnormal heating is resolved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the thermistor naturally cools down after power stop, then resistance decreases and enables automatic resumption, but this prevents safe examination of the underlying cause
Solution Approach 1:
The patent applies preliminary anti-action by designing the control circuit to actively prevent automatic resumption of voltage supply after abnormal heating is detected. The state holding circuit maintains the cutoff state even when the thermistor cools down and its resistance decreases. This counteracts the natural tendency of the thermistor to enable automatic resumption, ensuring that voltage supply only resumes after a deliberate reset operation following confirmation that the abnormal condition has been resolved.
2Reliability
If voltage supply is stopped to prevent further damage, then load and circuit protection is achieved, but manual reset adds operational complexity
Solution Approach 1:
The patent applies self-service by designing a reset circuit that automatically detects when the abnormal condition has been resolved and enables voltage supply resumption without requiring complex manual intervention. The reset circuit monitors the thermistor temperature and automatically transitions the state holding circuit from the cutoff state to the connected state when normal operating conditions are restored, reducing operational complexity while maintaining safety.
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 configuration effectively prevents automatic resumption of voltage supply after abnormal heating, allowing for safe examination and resolution of the issue, thereby reducing the risk of further damage to the load or circuit.
Implementation Method 1
A positive temperature coefficient thermistor 105 is disposed in the power line 102 of the direct-current voltage supply circuit 1100. If overcurrent or abnormal heating occurs in the direct-current voltage supply circuit 1100, the positive temperature coefficient thermistor 105 increases in resistance and stops the supply of direct-current voltage from the direct-current power source 101 to the load 104.
Implementation Method 2
when the positive temperature coefficient thermistor 105 naturally cools down after the supply of power from the direct-current power source 101 to the load 104 is stopped, the positive temperature coefficient thermistor 105 decreases in resistance and allows automatic resumption of the supply of direct-current voltage
Data Source
AI summary
A direct-current voltage supply circuit includes a first field effect transistor in a power line, a voltage divider including a first fixed resistor and a positive temperature coefficient thermistor between the power line and a ground line, a thyristor connected at an anode thereof to the power line, with a second field effect transistor interposed therebetween, connected at a gate thereof to a node in the voltage divider, and connected at a cathode thereof to the ground line, with a second fixed resistor interposed therebetween, and a third fixed resistor connected in parallel with the thyristor and the second field effect transistor. If abnormal heating increases the resistance of the positive temperature coefficient thermistor, the first field effect transistor is turned off and the supply of direct-current voltage is stopped.