Power-On Reset Circuit With Threshold-Triggered Voltage Detection
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Solution Overview
Problem
Traditional power on reset circuits continuously detect voltage after a device is turned on, leading to unnecessary power consumption.
Innovation Solution
A power on reset circuit comprising a first and second voltage detecting circuit and a logic circuit, where the logic circuit controls the first voltage detecting circuit to turn on only when the voltage is below the rising or falling threshold, reducing unnecessary detection and consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power on reset circuit continuously detects the voltage of the power supply after the device is turned on, then the voltage detection function is maintained, but the power consumption increases unnecessarily
Solution Approach 1:
The patent implements periodic voltage detection by controlling the first voltage detecting circuit to operate only during critical transitions (power-on and voltage drop events) rather than continuously. The logic circuit activates the first voltage detecting circuit based on signals from the second voltage detecting circuit, creating a periodic detection pattern that maintains reliability while reducing power consumption during stable operation.
2Speed
If the first voltage detecting circuit is always turned on to detect voltage changes, then the detection responsiveness is improved, but the power consumption increases
Solution Approach 1:
The patent uses the second voltage detecting circuit to monitor voltage in advance and generate trigger signals before the first voltage detecting circuit needs to activate. This preliminary detection mechanism allows the system to prepare for potential voltage changes and activate the high-power first voltage detecting circuit only when necessary, maintaining responsiveness while minimizing energy consumption.
3Use of energy by moving object
If the power on reset circuit shuts down the first voltage detecting circuit during stable operation, then power consumption is reduced, but the detection capability may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where the second voltage detecting circuit continuously monitors voltage and provides trigger signals to the logic circuit when voltage drops occur. This feedback loop ensures that the first voltage detecting circuit is reactivated promptly when voltage changes happen, maintaining detection capability while allowing the system to conserve power during stable operation periods.
Data Source
AI summary
Disclosed are a power on reset circuit, a power on reset method and an electric device using the same. In the power on reset circuit and method, a first voltage detecting circuit and a second voltage detecting circuit detect the voltage of a power supply and output a first voltage signal and a second voltage signal respectively. A logic circuit receives the first voltage signal and the second voltage signal to turn no or off the first voltage detecting circuit for detecting the voltage of the power supply. Specifically, merely when the voltage value of the power supply is less than a rising threshold voltage value of the first voltage detecting circuit or a falling threshold voltage value of the second voltage detecting circuit, the first voltage detecting circuit is turned on to detect the voltage value of the power supply.