Semiconductor Power Supply Selection Circuit for Voltage Stability
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Solution Overview
Problem
Semiconductor integrated circuit devices face challenges in maintaining optimal operation across varying external power supply voltages, leading to heat generation and potential malfunctions due to the lack of effective voltage regulation and management between internal and external power supply circuits.
Innovation Solution
The semiconductor integrated circuit device incorporates a selection circuit with a comparator and switch mechanism that dynamically selects between external and internal power supply voltages based on a reference voltage, ensuring stable operation by adjusting the power supply voltage to the internal circuit, thereby suppressing heat generation and preventing malfunctions across different power supply voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal power supply circuit operates without voltage selection mechanism, then the device structure remains simple, but heat generation increases and malfunctions occur under varying external power supply voltages
Solution Approach 1:
The power supply circuit transitions from a static configuration to a dynamic one by introducing a selection circuit that can switch between different power supply modes (external power supply mode and internal power supply mode) based on voltage conditions. This dynamic adaptation allows the circuit to maintain optimal operation across varying external power supply voltages, resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
The invention changes the operational parameters of the power supply circuit by introducing voltage threshold comparisons. When the external power supply voltage falls below a predetermined threshold, the selection circuit switches to internal power supply mode; otherwise, it operates in external power supply mode. This parameter-based control mechanism ensures stable operation while managing circuit complexity through systematic voltage regulation.
2Adaptability or versatility
If the device uses only external power supply, then the power supply circuit is simple, but the operational range is limited and heat generation occurs under varying voltage conditions
Solution Approach 1:
The power supply circuit achieves multi-functionality by incorporating both external power supply capability and internal power supply capability within a single integrated system. The selection circuit enables the device to universally adapt to different power supply scenarios (stable external voltage, fluctuating external voltage, or insufficient external voltage) by switching between power supply modes, thereby expanding the operational voltage range while managing complexity through unified control.
3Reliability
If voltage regulation is implemented without selection circuit, then heat generation is reduced, but voltage management precision deteriorates leading to potential malfunctions
Solution Approach 1:
The selection circuit implements a feedback mechanism by continuously monitoring the external power supply voltage and comparing it against a predetermined threshold. Based on this feedback, the circuit automatically switches between external and internal power supply modes, ensuring precise voltage management. This feedback-based control enhances reliability by preventing voltage-related malfunctions while maintaining manageable circuit complexity through systematic voltage regulation.
Data Source
AI summary
The present disclosure provides a semiconductor integrated circuit device. The semiconductor integrated circuit device includes: a first power supply terminal, configured to receive a first voltage; a second power supply terminal, configured to receive a second voltage; an internal power supply circuit; and a selection circuit, configured to select whether supplying the first voltage to the internal power supply circuit or supplying the second voltage to the internal power supply circuit according to a comparison result between the first voltage and a reference voltage or the second voltage and the reference voltage. The second voltage is a voltage lower than the first voltage and during a current flowing through the second power supply terminal.