Power-On Reset Circuit for Sharp Supply Voltage Rise Detection
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Solution Overview
Problem
Existing power-on reset circuits face challenges in detecting a rapid rise in power supply voltage while maintaining low current consumption, leading to indeterminate reset signals and increased current consumption when attempting to shorten time constants.
Innovation Solution
A semiconductor device with diodes connected in parallel between power supplies, and capacitor elements connected in parallel between one power supply and each diode, which outputs a comparison result between voltages from resistor circuits as a reset signal, allowing for rapid power-on reset without increasing current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the time constant of the power-on reset circuit is shortened to enable rapid reset detection, then the response speed to power supply voltage rise is improved, but the current consumption increases
Solution Approach 1:
The patent applies dynamics by making the time constant adjustable rather than fixed. The circuit can adapt its response characteristics based on operating conditions, allowing rapid reset detection when needed while consuming less current during normal operation. This is achieved through configurable circuit parameters that can be set during design or operation.
Solution Approach 2:
The patent changes the parameters of the circuit elements (resistors, capacitors, diodes) to optimize the balance between response speed and current consumption. By carefully selecting and adjusting these parameters, the circuit achieves rapid detection of power supply voltage rises without requiring excessively low resistance values that would cause high current consumption.
2Loss of time
If the resistance values in the power-on reset circuit are reduced to speed up reset detection, then the response time is improved, but the current consumption increases
Solution Approach 1:
The circuit enables dynamic adjustment of the effective time constant through configurable parameters, allowing rapid reset detection without permanently reducing resistance values. The circuit can switch between different operational modes or have its parameters optimized for specific applications, achieving fast response only when required.
Solution Approach 2:
The patent incorporates preliminary design considerations where the circuit parameters are pre-configured to provide rapid reset detection capability. The circuit is designed with components and topology that enable fast response by default or through simple configuration, without requiring continuous adjustment or reduction of resistance values that would increase current consumption.
3Reliability
If the power-on reset circuit is designed for rapid voltage rise detection, then the reset signal reliability is improved, but the circuit complexity increases
Solution Approach 1:
The patent segments the power-on reset circuit into functional modules with distinct roles. This modular approach allows each segment to be optimized independently for rapid detection while maintaining overall simplicity. The segmented design makes the circuit easier to analyze, design, and implement without excessive complexity.
Solution Approach 2:
The patent designs a universal power-on reset circuit that can handle various power supply voltage rise scenarios through configurable parameters rather than requiring multiple specialized circuits. This multi-functional design achieves reliable reset detection across different conditions without increasing circuit complexity, as the same circuit structure adapts to different requirements through parameter adjustment.
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
Enables stable power-on reset detection even with rapid power supply voltage rises, reducing the need to adjust resistance values and thus minimizing current consumption, while maintaining tolerance to temperature and element variations.
Implementation Method 1
capacitor elements, which are connected in parallel between one power supply and each diode
Implementation Method 2
two diodes, which are connected in parallel between power supplies
Implementation Method 3
resistor circuits... outputs a comparison result between voltages from the two resistor circuits
Data Source
AI summary
To realize an optimal power-on reset in a system in which the rise of the power supply voltage is sharp.A semiconductor device according to the present invention includes two diodes connected in parallel between power supplies, and a resistor circuit and a capacitance element connected in parallel between one power supply and each of the two diodes, and outputs a comparison result between voltages outputted from the two resistor circuits as a reset signal.