Reverse Conduction Blocking Circuit for IC Enable Pin Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuits can unintentionally turn on or activate when a battery pack is connected to their output, leading to undesirable and unacceptable operation.
Innovation Solution
A control circuit is implemented with switching elements and resistors to detect voltage differences between output and input pins, actively pulling the enable pin to ground to prevent activation, ensuring the load switch remains off even when voltages are applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the enable pin is connected to voltage supply through a resistive divider network, then the integrated circuit can be activated, but the integrated circuit can be unintentionally turned on when a battery pack is connected to the output
Solution Approach 1:
The patent applies preliminary anti-action by implementing a control circuit that proactively prevents reverse conduction before unintentional activation can occur. The circuit detects voltage conditions and preemptively blocks current flow from output to input pins, counteracting the potential harmful effect before it can activate the integrated circuit unintentionally.
Solution Approach 2:
The patent uses an intermediary control circuit as a mediator between the output pin and the enable pin. This intermediary circuit includes switching elements that are controlled based on voltage detection, acting as a gatekeeper that selectively allows or blocks the activation signal path, thereby preventing direct unintentional activation while still permitting intentional activation.
2Reliability
If a control circuit is implemented to detect voltage differences and prevent activation, then unintentional activation is prevented, but device complexity increases
Solution Approach 1:
The control circuit is designed to perform multiple functions: it detects voltage differences between pins, determines activation conditions, controls switching elements, and prevents reverse conduction. By making the control circuit multi-functional, the patent reduces the need for separate dedicated circuits for each function, thereby limiting the increase in device complexity while achieving reliable unintentional activation prevention.
Solution Approach 2:
The patent merges the voltage detection, control logic, and switching functions into a single integrated control circuit. The switching elements are directly controlled by the same circuit that detects voltage conditions, combining what could have been separate components into one unified structure, thus minimizing the increase in device complexity.
Data Source
AI summary
In one embodiment, a circuit includes a resistance including first and second terminals. The first terminal of the resistance is coupled to ground. The circuit also includes a first switching element including first, second, and third terminals. The first terminal of the first switching element is coupled to an output of an integrated circuit and the second terminal of the first switching element is coupled to a voltage supply of the integrated circuit. Additionally, the circuit includes a second switching element including first, second, and third terminals. The first terminal of the second switching element is coupled to an enable input of the integrated circuit. Furthermore, the second terminal of the second switching element is coupled to the third terminal of the first switching element and to the second terminal of the resistance. Moreover, the third terminal of the second switching element is coupled to the ground.