Power Reset Circuit With Hysteresis for Stable On/Off Voltage Detection
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Solution Overview
Problem
Semiconductor integrated circuits face challenges in preventing malfunction during power-on and power-off modes due to the lack of effective circuits that can detect and manage varying power supply voltage levels, leading to potential abnormal operations.
Innovation Solution
A power on/off reset circuit comprising a driving circuit, a hysteresis control circuit, and a buffering circuit that detects different power supply voltage levels during power-on and power-off modes, generating a reset signal without external control signals, and includes a hysteresis control circuit with a hysteresis characteristic to differentiate voltage levels based on activation and deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power on/off reset circuit is designed to detect different voltage levels during power-on and power-off modes, then the reliability of the semiconductor integrated circuit is improved, but the device complexity increases due to the need for additional circuits
Solution Approach 1:
The patent combines the power-on reset and power-off reset functions into a single integrated circuit that detects both rising and falling edges of the power supply voltage. The circuit merges the voltage detection functionality for both power-on and power-off conditions, eliminating the need for separate detection circuits and reducing overall device complexity while maintaining reliability.
Solution Approach 2:
The reset circuit is designed to perform multiple functions: detecting power-on voltage rise, detecting power-off voltage fall, generating reset signals for both conditions, and providing hysteresis control. This multi-functional design eliminates the need for separate dedicated circuits for each function, thereby improving reliability without proportionally increasing device complexity.
2Ease of operation
If external control signals are used to manage the reset circuit, then the ease of operation is improved, but the device complexity increases due to additional control inputs
Solution Approach 1:
The reset circuit automatically detects the power supply voltage status and generates appropriate reset signals without requiring external control signals. The circuit self-regulates by monitoring the voltage levels and triggering reset conditions based on pre-defined thresholds, eliminating the need for external control inputs while maintaining ease of operation.
Solution Approach 2:
The circuit incorporates feedback mechanisms where the detected voltage levels are fed back to control the reset signal generation. The hysteresis control circuit uses feedback from the voltage detection to maintain stable reset states and prevent oscillation, allowing the circuit to operate autonomously without external control while ensuring reliable operation.
3Ease of operation
If the hysteresis control circuit is activated without external control signals, then the ease of operation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The circuit uses parameter changes in the power supply voltage itself as the trigger for activating the hysteresis control. By monitoring voltage level transitions (rising edge for power-on, falling edge for power-off), the circuit automatically activates appropriate reset functions without requiring external control signals or high-precision manufacturing tolerances.
Solution Approach 2:
The hysteresis control circuit incorporates built-in voltage thresholds that create a buffer zone between activation and deactivation points. This cushioning effect prevents oscillation and ensures stable operation even with variations in manufacturing parameters, allowing automatic activation without requiring extremely tight manufacturing precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a simple and efficient power on/off reset circuit that effectively manages power supply voltage levels, ensuring stable operation of semiconductor integrated circuits by generating a reset signal during both power-on and power-off durations, thus preventing malfunctions.
Implementation Method 1
a hysteresis control circuit which is activated or deactivated based on the power supply voltage without a control signal provided from an external circuit, is activated during one of the power-on duration and the power-off duration, and is deactivated during the other of the power-on duration and the power-off duration
Data Source
AI summary
A power on/off reset circuit includes a driving circuit, a hysteresis control circuit and a buffering circuit. The driving circuit detects a first level of a power supply voltage during a power-on duration of the power supply voltage, detects a second level of the power supply voltage during a power-off duration of the power supply voltage, and generates a driving signal that is transitioned based on the first level and the second level. The hysteresis control circuit is connected to an output terminal of the driving circuit, is activated or deactivated based on the power supply voltage without a control signal, is activated during one of the power-on duration and the power-off duration, and is deactivated during the other of the power-on duration and the power-off duration. The buffering circuit is connected to the output terminal of the driving circuit, and generates a reset signal based on the driving signal.