Power Supply Voltage Reset Circuit for Adjustment Test Compatibility
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Solution Overview
Problem
Conventional power supply voltage reset circuits generate a reset signal based on the internal power supply voltage level during adjustment tests, which disables the test process.
Innovation Solution
A power supply voltage reset circuit that generates a power-on adjustment voltage independently of the internal power supply voltage reference signal, comparing it with an internal reference voltage to control the reset signal, ensuring the reset signal is not generated during voltage adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reset signal is generated based on the internal power supply voltage level, then the power-on reset function is achieved, but the adjustment test is disabled
Solution Approach 1:
The patent segments the voltage monitoring function by creating separate monitoring paths: one for power-on reset (comparing Vint with Vref) and another for adjustment test (detecting voltage change trends). This allows independent control of reset signal generation based on different operational modes.
Solution Approach 2:
The patent introduces dynamic control by detecting the trend of voltage change (rising or falling) and adjusting the reset signal generation accordingly. When voltage is rising, reset is enabled; when falling (during adjustment test), reset is suppressed. This dynamic adaptation resolves the contradiction between reliable reset and test capability.
2Reliability
If the reset signal is generated when Vref > Vint, then power-on reset is achieved, but false reset occurs during voltage adjustment
Solution Approach 1:
The patent applies preliminary anti-action by detecting the voltage change trend before generating the reset signal. When a voltage drop is detected (indicating adjustment test), the system preemptively suppresses the reset signal generation, preventing false reset before it can occur.
Solution Approach 2:
The patent introduces an intermediate control mechanism (voltage change trend detector) that mediates between the voltage comparison result and the reset signal generation. This intermediary layer filters out adjustment test conditions from triggering false resets, allowing smooth voltage adjustment operations.
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
This approach allows for reliable power-on resetting of internal circuits without interfering with adjustment tests, ensuring smooth execution by generating the reset signal based on the rising power supply voltage.
Implementation Method 1
generates a reset signal by comparing the voltage level of an internal reference voltage with the voltage level of an internal power supply voltage
Data Source
AI summary
A power supply voltage reset circuit, provided in an apparatus having an internal circuit capable of adjusting an internal power supply voltage, for resetting the internal circuit when a power supply voltage of the apparatus rises, and includes: a unit that generates an internal power supply voltage reference signal and changes a signal level thereof; a unit that generates an internal reference voltage to be a reference level in generating a reset signal for the internal circuit at a time of rising of the power supply voltage; a unit that generates a power-on adjustment voltage which rises later than the internal reference voltage at the time of rising of the power supply voltage and becomes greater than the internal reference voltage after a predetermined time passes; and a unit that generates the reset signal by comparing the internal reference voltage with the power-on adjustment voltage.