Voltage Detection Circuit with Adjustable Threshold and Low Dark Current
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Solution Overview
Problem
Conventional voltage detection circuits for batteries require multiple ICs for different detection voltage values, leading to increased man-hours and inventory management complexity, and result in higher dark current due to small external resistor values, which complicates adjusting detection voltage without increasing battery current.
Innovation Solution
A semiconductor integrated circuit with a voltage detection circuit that includes a voltage input terminal, a voltage dividing circuit, a voltage comparison circuit, a detection voltage adjustment terminal, and a voltage-current conversion circuit, allowing for detection voltage adjustment by varying the resistance value of an external resistor connected to the detection voltage adjustment terminal, reducing dark current and enabling high-accuracy voltage detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external resistors RE1 and RE2 are used to adjust detection voltage, then detection voltage value can be changed, but dark current of battery increases
Solution Approach 1:
The patent changes the resistance values of internal resistors RI1 and RI2 to different sets (first set and second set) depending on whether external resistors are connected. When external resistors are detected, the internal resistors switch to higher resistance values, thereby reducing dark current while maintaining detection voltage adjustability through the external resistors.
Solution Approach 2:
The patent makes the resistance values of internal resistors dynamic rather than fixed. The resistors can switch between different resistance sets based on the connection state of external resistors, allowing the system to adapt its electrical characteristics to minimize power consumption while maintaining functionality.
2Adaptability or versatility
If external resistors RE1 and RE2 are used to adjust detection voltage, then detection voltage value can be changed, but detection accuracy decreases due to variations in internal resistors
Solution Approach 1:
The patent changes the resistance ratio relationship between internal resistors based on external resistor connection. When external resistors are detected, the internal resistors switch to a second set with a different resistance ratio, which compensates for the voltage division effect of external resistors and maintains accurate detection voltage levels despite the added external components.
3Adaptability or versatility
If multiple voltage detection ICs are prepared for different detection voltage values, then detection voltage can be adjusted, but inventory management complexity and man-hours increase
Solution Approach 1:
The patent makes a single voltage detection IC universal by enabling it to support multiple detection voltage values. Through the combination of external resistors and switchable internal resistor sets, one IC can perform the function of multiple specialized ICs, thereby simplifying inventory management and reducing complexity.
Solution Approach 2:
The patent introduces dynamic configurability to a previously static device. The voltage detection IC can dynamically adjust its internal resistance characteristics based on external connections, transforming it from a fixed-function device into a multi-functional universal device that replaces multiple specialized ICs.
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 allows for adjustable detection voltage without increasing battery dark current, reduces the need for multiple ICs, and enhances voltage detection accuracy, while maintaining low power consumption and usability.
Implementation Method 1
a voltage dividing circuit that includes series resistors RI1 and RI2 connected between the voltage input terminal VS and a ground point
Implementation Method 2
a comparator COMP that compares a voltage divided by the voltage dividing circuit with a predetermined reference voltage VREF
Implementation Method 3
a voltage-current conversion circuit that is provided between the detection voltage adjustment terminal ADJ and the voltage dividing circuit
Data Source
AI summary
A voltage detection circuit including a voltage input terminal, a voltage dividing circuit, a voltage comparison circuit, an output terminal, a detection voltage adjustment terminal, a voltage-current conversion circuit, and a constant current source. A voltage to be monitored is input to the voltage input terminal. The voltage dividing circuit includes series resistors between the voltage input terminal and a constant voltage terminal. The voltage comparison circuit compares a voltage divided by the voltage dividing circuit with a predetermined voltage. The comparison result is output from the output terminal. An external resistor is connected to the detection voltage adjustment terminal. The voltage-current conversion circuit is provided between the detection voltage adjustment terminal and the voltage dividing circuit. The constant current source is connected between an internal power supply voltage terminal and the detection voltage adjustment terminal.