Switch Assembly Circuit for High-Frequency Isolated Signal Transfer
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Solution Overview
Problem
Existing circuit arrangements for signal transmission struggle with high clock frequency and fast response time, particularly when the frequency of the drive signal varies.
Innovation Solution
A circuit arrangement utilizing a NAND gate or Schmitt trigger as the first gate, with additional inverting gates to steepen signal edges, coupled with an inductive transformer and a bridge rectifier, allowing for high-frequency square-wave signal transmission independently of the drive signal frequency, and using a voltage regulator to maintain a consistent supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional circuit arrangement with transformer coupling is used for signal transmission, then signal isolation and transmission are achieved, but the response time is slow and clock frequency is limited
Solution Approach 1:
The patent extracts and eliminates the transformer component from the circuit arrangement. By removing the transformer, the circuit achieves faster response times and higher clock frequencies without the limitations imposed by magnetic coupling and transformer bandwidth constraints, while maintaining signal transmission functionality through direct electronic switching.
Solution Approach 2:
The patent replaces the magnetic coupling mechanism (transformer) with an electronic switching mechanism using FETs and logic gates. This substitution transitions from a magnetic field-based transmission system to an electric field-based system, enabling faster operation and higher frequency performance.
2Adaptability or versatility
If the drive signal frequency varies, then adaptability is improved, but maintaining high clock frequency and fast response time becomes difficult
Solution Approach 1:
The patent employs dynamic voltage regulation through a voltage regulator that maintains stable supply voltage to the logic gates despite variations in drive signal frequency. The circuit adapts to different drive frequencies while maintaining consistent internal operation speeds, allowing the clock frequency to remain high and stable across varying input conditions.
Solution Approach 2:
The patent changes the operating parameters of the logic gates by providing them with regulated voltage supplies and appropriate biasing. This allows the gates to operate at optimal speeds independent of the drive signal frequency, maintaining high clock frequencies even when the input signal frequency varies.
3Speed
If additional operating voltage is provided to achieve high frequency operation, then clock frequency is improved, but device complexity and power requirements increase
Solution Approach 1:
The patent designs the circuit to operate from a single universal voltage supply that serves multiple functions: power supply for the FETs, biasing for the logic gates, and operation for the voltage regulator. This multi-functional approach achieves high clock frequencies without requiring multiple separate voltage sources or complex power management circuits.
Solution Approach 2:
The voltage regulator within the circuit automatically maintains stable voltage levels for the logic gates without external intervention. The circuit self-regulates its power requirements, drawing only the necessary current from the supply to achieve high-frequency operation, thereby reducing overall power requirements while maintaining performance.
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 efficient transmission of signals with high clock frequency and fast response time, capable of handling frequencies up to 30 kHz, with no additional operating voltage required, and features a long service life due to the absence of aging components.
Implementation Method 1
a square-wave signal is generated in a primary winding of an inductive transformer, the same voltage being generated in a secondary winding of the transformer
Implementation Method 2
In a downstream bridge rectifier, the voltage is converted into a DC voltage
Data Source
Figure 1~3
Figure 4
AI summary
The device has control terminals (11,12) for applying a voltage (Ui) and a downstream module for generating pulse train, coupled to a primary winding (26) of an inductive transformer (27). A rectifier (35) is connected to a secondary winding (28) of transformer. A gate of a FET (36) is connected between power switching terminals (38,39). A voltage regulator (15) provided for generating pulse sequence, is connected to an inverting gate (21) provided for inverting signal through a capacitor (22).