Power Source Switching Device Pin Leakage Control
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Solution Overview
Problem
Power source switching devices experience instability and increased power consumption due to pin leakage when using pull-down or pull-up resistors, as the potential of the signal input terminal fluctuates without a selection signal, leading to unwanted current flow through the resistors.
Innovation Solution
A power source switching device with a signal input terminal, a power source switching circuit, a switch connected via a resistor element to fix the potential, and a switch control circuit that manages the switch's state based on the operational state of the selected power source, ensuring the switch is in an ON state when no selection signal is input and transitions to OFF when the signal's potential differs, thereby preventing continuous current leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a pull-down resistor or pull-up resistor is connected to the signal input terminal to fix the potential, then the potential stability is improved, but pin leakage occurs causing increased power consumption
Solution Approach 1:
The patent applies the dynamics principle by making the switch state changeable based on operational conditions. The switch connected via the first resistor element transitions between ON and OFF states depending on whether a selection signal is input and its potential level. This dynamic switching allows the system to fix the potential at the signal input terminal when needed (reducing noise) while avoiding continuous current flow (reducing power consumption), thereby resolving the contradiction between potential stability and energy loss.
2Stability of the object's composition
If the switch is kept in ON state to fix the potential, then the potential stability is improved, but current leakage occurs continuously increasing power consumption
Solution Approach 1:
The patent implements dynamic control of the switch state based on operational conditions. The switch control circuit monitors whether a selection signal is input and its potential level, then appropriately switches the switch between ON and OFF states. This prevents continuous current leakage while maintaining potential stability when required, resolving the contradiction between potential stability and energy consumption.
Solution Approach 2:
The patent employs feedback mechanisms where the switch control circuit continuously monitors the state of the selection signal (presence and potential level) and adjusts the switch state accordingly. This feedback-based control ensures the switch is ON only when necessary to fix the potential, and OFF when the selection signal is properly input, thereby eliminating continuous power consumption while maintaining potential stability when needed.
3Loss of energy
If the switch is placed in OFF state to reduce power consumption, then power consumption is reduced, but the potential of the signal input terminal fluctuates causing unstable operation
Solution Approach 1:
The patent applies dynamics by making the switch state adaptive rather than fixed. The switch control circuit dynamically adjusts the switch state based on real-time monitoring of the selection signal conditions. When no selection signal is input or the potential is inappropriate, the switch turns ON to fix the potential and ensure stable operation. When a valid selection signal is input, the switch turns OFF to reduce power consumption. This dynamic adaptation resolves the contradiction between power consumption and operation stability.
Data Source
AI summary
A power source switching device that includes: a switch connected to a signal input terminal via a first resistor element and configured to fix a potential of the signal input terminal at a predetermined potential by adopting an ON state in a case in which a selection signal is not input; and a switch control circuit configured to perform control to place the switch in an OFF state based on a state signal indicating an operational state of a circuit that operates when supplied with power from a power source selected according to the selection signal in a case in which a potential of the selection signal is different from the predetermined potential, and to perform control to place the switch in the ON state in a case in which the selection signal is not input.