Load Driving Device Erroneous Blocking Prevention
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Solution Overview
Problem
Existing load driving devices face the risk of erroneous blocking operations in switch units due to potential rises caused by applied currents, leading to repeated unintended ON and OFF operations.
Innovation Solution
A load driving device is designed with a control unit, a first switch unit, and a second switch unit, where the second switch unit ensures a conductive state between the power supply path and the first input line when a driving signal is output, maintaining a high potential difference to prevent erroneous blocking, even if the potential on the load side rises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power supply to load is controlled by switching between switching elements, then power supply control is achieved, but erroneous blocking occurs in switching element due to potential rise caused by applied current
Solution Approach 1:
A capacitor is introduced as an intermediary component connected between the input line and ground. This capacitor acts as a mediator that stabilizes the potential at the input line by providing a reference potential, thereby preventing erroneous blocking of the switching element while maintaining power supply control functionality
Solution Approach 2:
The capacitor is pre-connected to the input line before switching operations occur. This preliminary configuration establishes a stable reference potential in advance, preventing potential rise issues that would otherwise cause erroneous blocking during subsequent switching operations
Data Source
AI summary
A load driving device is configured to reduce erroneous blocking operation in a switch. The load driving device includes: a control unit configured to output a driving signal and a non-driving signal; a first switch unit configured to switch power between a power supply unit and a load to a conductive state and a non-conductive state, and switch the power path to a conductive state when a difference between a potential of the first input line and a potential of a conducting path on the load side is greater than a predetermined value; and a second switch unit configured to connect a power supply to the first input line into a conductive state upon the control unit outputting the driving signal, and to block conduction between the power supply path and the first input line upon the control unit outputting the non-driving signal.