Power-on Control Circuit Voltage Sequencing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuits in electronic devices often experience abnormal functioning and generate errors due to voltage fluctuations, as they may not reach target values, leading to potential simultaneous activation of output switches and leakage currents during initial power-on phases.
Innovation Solution
A power-on control circuit comprising a detecting circuit, a switching circuit, and a setting circuit that controls first and second output switches, ensuring that the voltage sources gradually increase and are only fully utilized when pre-determined values are reached, preventing simultaneous activation and leakage currents during the initial power-on phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If voltage sources are applied immediately during power-on, then power-on speed is improved, but output switches may activate simultaneously causing leakage currents and errors
Solution Approach 1:
The patent applies preliminary action by detecting voltage levels before enabling output switches. The detecting circuit monitors V1 and V2 voltages, and only when predetermined voltage thresholds are reached, the output switches are enabled. This preliminary voltage verification prevents premature switch activation and potential leakage currents, ensuring reliable operation while maintaining efficient power-on sequencing.
2Reliability
If voltage levels are monitored and controlled during power-on, then operation reliability is improved, but circuit complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a dedicated detecting circuit as a mediator between the voltage sources and output switches. This detecting circuit independently monitors voltage levels and provides control signals to the output switches through the switching circuit. By separating the detection function from the switching control, the patent achieves reliable voltage monitoring without significantly increasing overall system complexity, as each component has a specific, simple function.
Data Source
AI summary
A power-on control circuit controlling a first output switch and a second output switch is provided. A detecting circuit detects a first voltage to generate a detection signal to a first node. A switching circuit receives the first voltage and a second voltage and transmits the first or second voltage to a second node according to the voltage level of the first node. A setting circuit generates a feedback signal to the first node according to a voltage level of the second node. When the first voltage reaches a first pre-determined value and the second voltage has not reached a second pre-determined value, the switching circuit transmits the second voltage to the second node. When the second voltage reaches the second pre-determined value, the switching circuit transmits the first voltage to the second node.