Low-Voltage Reset Circuit With Power-On-Only Standby Saving
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Solution Overview
Problem
Conventional low-voltage detection reset circuits with power-on reset functions consume excessive current and have a large size due to continuous operation in standby mode.
Innovation Solution
A low-voltage detection reset circuit with a power-on reset circuit that outputs a reset pulse only during power-on, a detection level setting circuit that compares with a reference voltage, and a control circuit to set the detection level to a default value, activating the programmable low-voltage detection circuit and reducing power consumption and circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the low-voltage detection circuit with power-on reset function operates continuously in standby mode, then the power-on reset function is ensured, but the current consumption increases and the circuit size becomes large
Solution Approach 1:
The power-on reset circuit operates periodically only during power-on events rather than continuously. The circuit detects the rising edge of the power supply voltage and generates a reset pulse only at that moment, then enters standby mode. This periodic operation mode eliminates continuous current consumption while ensuring the power-on reset function is performed whenever power is applied or restored.
2Reliability
If the low-voltage detection circuit with power-on reset function operates continuously in standby mode, then the power-on reset function is ensured, but the circuit size becomes large
Solution Approach 1:
The power-on reset function is extracted as a separate, independent circuit module from the continuous standby detection circuit. This dedicated power-on reset circuit only activates during power-on events, allowing the main low-voltage detection circuit to be simplified and reduced in size while the extracted power-on reset module handles the initialization function separately.
3Use of energy by moving object
If the programmable low-voltage detection circuit is inactivated during non-use period, then the current consumption is reduced, but the detection response may be delayed
Solution Approach 1:
The power-on reset circuit performs preliminary initialization actions by resetting the system and setting default detection levels immediately upon power-on. This preliminary action ensures that the programmable low-voltage detection circuit is properly initialized and ready for immediate operation when activated, eliminating any potential detection response delay that might occur from being inactivated during non-use periods.
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 suppresses current consumption in standby mode and reduces circuit size while maintaining power-on reset and programmable low-voltage detection functions.
Implementation Method 1
a first comparator circuit 1, a PMOS (P-channel type MOS transistor) 12 that controls supply of a power supply voltage Vdd to the first comparator circuit 11 and a first detection level setting circuit 13 capable of setting a first detection level that is variable corresponding to the power supply voltage Vdd
Implementation Method 2
A low-voltage detection circuit with a power-on reset function 20 is provided with a second comparator circuit 21 and a second detection level setting circuit 22 that sets a second detection level corresponding to the power supply voltage Vdd
Data Source
AI summary
A low-voltage detection reset circuit that suppresses a current consumption in a stand-by mode and is reduced in a size is offered. The low-voltage detection reset circuit is provided with a power-on reset circuit that operates only at power-on and outputs a reset pulse and is configured to set a detection level of a detection level setting circuit at a default value using the reset pulse and to activate a programmable low-voltage detection circuit. After the programmable low-voltage detection circuit is activated, a detection level of the programmable low-voltage detection circuit can be modified from the default value by a register.