Switch Identification Circuit for Accurate Short-Circuit Detection
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Solution Overview
Problem
Existing switch identification circuits fail to accurately identify a short-circuited state, leading to potential safety risks during car starting, as they rely on triodes or optocouplers that can pass charges at minimum turn-on voltage.
Innovation Solution
A switch identification circuit comprising a detecting unit, a control unit, a connection unit, and connection terminals, which detects voltage differences between terminals to determine if they are short-circuited, and upon detection, controls the power-supply device to stop supplying driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a triode or optocoupler identification detection circuit is used to determine the connection state of the load, then the circuit can operate with simple structure, but it cannot accurately identify short-circuited state because these components can pass charges when minimum turn-on voltage is reached
Solution Approach 1:
The patent introduces an identification circuit as an intermediary component between the power supply device and the load. This identification circuit includes a detecting unit that specifically detects voltage at connection terminals to determine short-circuit states. The intermediary nature of this detection layer allows accurate short-circuit identification without requiring complex modifications to the existing triode or optocoupler-based control circuits, thus resolving the contradiction between measurement precision and device complexity.
2Reliability
If the power-supply device continues to supply driving voltage to ensure load operation, then the productivity is maintained, but the safety is compromised when a short-circuited state occurs
Solution Approach 1:
The patent implements a feedback mechanism where the detecting unit continuously monitors the voltage at the first and second connection terminals, and the control unit receives this detection signal to determine the connection state. When a short-circuit is detected (voltage difference indicates abnormal condition), the control unit outputs a connection-enabling signal to the connection unit, which then controls the power-supply device to stop supplying driving voltage. This feedback loop ensures safety by automatically interrupting power supply when short-circuit conditions are detected, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The identification circuit performs preliminary detection of the connection state before the power-supply device supplies driving voltage to the load. By detecting the voltage at connection terminals in advance and determining whether a short-circuit exists prior to power delivery, the system prevents unsafe operation. This preliminary action ensures that productivity is only maintained when safety conditions are met, effectively resolving the contradiction between reliability and productivity.
Data Source
AI summary
A switch identification circuit is provided. The switch identification circuit includes a detecting unit, a control unit, a connection unit, a first connection terminal, and a second connection terminal. The detecting unit is coupled with the first connection terminal and the second connection terminal, and configured to detect voltages at the two connection terminals to output a detection signal. The connection unit is electrically coupled with a power-supply device configured to provide a driving voltage to the two connection terminals. The control unit is coupled with the detecting unit and the connection unit, and configured to determine whether the first connection terminal and the second connection terminal are short-circuited according to the detection signal. If the two connection terminals are short-circuited, the control unit is configured to output a connection-enabling signal to the connection unit, to make the connection unit control the power-supply device to stop supplying the driving voltage.