Semiconductor Switch Control for Reverse Current-Free Voltage Switching
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Solution Overview
Problem
Existing semiconductor integrated circuits face challenges in preventing reverse currents when switching between input voltages, leading to potential power consumption increases and noise in output voltages during voltage switching operations.
Innovation Solution
The semiconductor integrated circuit design incorporates switch circuits, correction circuits, and comparison circuits that manage voltage thresholds and slew rates to ensure simultaneous switching states of switch circuits SW5 and SW12, preventing both reverse currents and noise by monitoring gate signals and controlling voltage transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage switching is performed between input voltages, then power supply flexibility is improved, but reverse currents occur leading to increased power consumption
Solution Approach 1:
The control circuit performs preliminary action by monitoring the voltage level of the second input voltage before switching occurs. When the second input voltage reaches a predetermined level, the control circuit proactively switches off the first switch circuit before the switching operation is completed, thereby preventing reverse current flow from occurring in the first place rather than merely mitigating its effects
2Adaptability or versatility
If voltage switching is performed between input voltages, then power supply flexibility is improved, but noise is generated in output voltages
Solution Approach 1:
The control circuit executes preliminary action by detecting when the second input voltage reaches the predetermined level and switching off the first switch circuit in advance, before the switching operation completes. This proactive timing prevents the overlapping conduction states that generate noise, thereby eliminating the harmful effect at its source
3Ease of operation
If simultaneous switching of switch circuits is not controlled, then circuit operation simplicity is maintained, but reverse currents and noise occur
Solution Approach 1:
The control circuit implements feedback by continuously monitoring the voltage level of the second input voltage and using this information to determine the optimal timing for switching off the first switch circuit. This closed-loop control ensures precise coordination of the switch circuits, preventing reverse currents and noise while maintaining relatively simple circuit operation through automatic voltage-level-based decision making
Data Source
AI summary
According to one embodiment, semiconductor integrated circuit includes a first switch circuit, a second switch circuit, a correction circuit and a comparison circuit. The first switch circuit is configured to output or interrupt a first voltage in accordance with a first signal. The second switch circuit is configured to output or interrupt a second voltage in accordance with a second signal. The correction circuit is configured to correct the second signal and output a third signal. The comparison circuit is configured to compare the third signal output from the correction circuit with the first voltage and determine the first signal based on a result of comparison.