Digital Signal Input Device with Pulse Control for DC Voltage Detection
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Solution Overview
Problem
Conventional digital signal input devices used in electrical stations face challenges in efficiently converting DC voltages of varying levels into digital signals while minimizing heat generation and meeting the requirements of different voltage ranges, which leads to the need for multiple configurations for each voltage level, increasing complexity and cost.
Innovation Solution
A digital signal input device with a pulse control unit that adjusts the pulse width of a pulse signal based on a fixed period, allowing the device to detect voltage levels accurately across different DC voltages, using a switching element to control the charging circuit and a management unit to store and adjust pulse widths for optimal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same input circuit configuration is used for multiple DC voltage levels, then device complexity is reduced, but measurement precision deteriorates due to varying time constants
Solution Approach 1:
The patent applies dynamics by making the pulse width variable rather than fixed. The control unit adjusts the pulse width dynamically based on the detected DC voltage level, allowing the same input circuit to adapt to different voltage ranges. This resolves the contradiction by enabling precise measurement across multiple voltage levels without requiring multiple dedicated circuits for each voltage level.
Solution Approach 2:
The patent changes the parameter of pulse width according to the detected voltage level. By varying this temporal parameter, the system can accurately measure different DC voltage levels using a single circuit configuration. This parameter adjustment allows the charging circuit to reach appropriate detection thresholds for each voltage level, maintaining measurement precision while reducing device complexity.
2Adaptability or versatility
If pulse width is increased to detect lower DC voltages, then adaptability improves, but heat generation increases
Solution Approach 1:
The system dynamically adjusts pulse width based on the detected voltage level rather than using a continuously high pulse width. This means that for higher voltage levels, the pulse width is reduced, thereby reducing energy consumption and heat generation while maintaining the ability to detect lower voltages when needed. This dynamic adjustment resolves the contradiction between adaptability and energy loss.
3Measurement precision
If multiple input circuit configurations are provided for different voltage levels, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent makes a single input circuit universal by enabling it to handle multiple DC voltage levels through dynamic pulse width adjustment. Instead of providing separate dedicated circuits for each voltage level (which would increase complexity), the system allows one circuit to perform multiple functions by adapting its operation based on the detected voltage, thereby maintaining measurement precision without increasing device complexity.
Solution Approach 2:
The single input circuit is made dynamic through pulse width modulation controlled by the control unit. This dynamic capability allows the circuit to optimize its operation for different voltage levels, achieving the functionality of multiple static circuits with a single dynamic circuit, thus improving voltage detection accuracy across ranges without increasing the number of circuits.
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 solution enables the digital signal input device to efficiently convert a wide range of DC voltages into digital signals with reduced heat generation, using a single configuration for multiple voltage levels, thus simplifying the design and improving compatibility with various electrical standards.
Implementation Method 1
a capacitor constituting the CR filter is charged according to a time constant at the series circuit
Implementation Method 2
the electric discharge is carried out according to a time constant for a closed circuit of the capacitor and the resistor constituting the CR filter
Implementation Method 3
a Zener diode, and a built-in light-emitting diode (LED) of an insulating photocoupler are arranged in series across the ends of the CR filter
Implementation Method 4
A built-in phototransistor of the insulating photocoupler then outputs a digital signal ('1', '0') to the internal circuit
Data Source
AI summary
A digital signal input device has a first input terminal and a second input terminal, a charging circuit connected between the first input terminal and the second input terminal, and a digital signal detection unit that outputs a digital signal of a logical value corresponding to a level of a charging voltage to an internal circuit. A pulse control unit generates a pulse signal having a fixed period using designated pulse width and pulse period. A switching element is provided between the charging circuit and the first input terminal or the second input terminal, which controls a period of applying a DC voltage to the charging circuit using a pulse width of the pulse signal.