Transformer-Isolated Signal Transmission for Low-Voltage Switch Control
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Solution Overview
Problem
Conventional signal transmission devices require high-withstand-voltage processes, which are costly and increase manufacturing complexity, especially in applications like vehicle-mounted power supply and motor driving devices.
Innovation Solution
A signal transmission device with a configuration that includes a transmission circuit, reception circuit, and insulating circuit, utilizing transformers to isolate the primary and secondary circuits, allowing for pulse-driven control signals and external signal-driven switch operation, eliminating the need for high-withstand-voltage processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-withstand-voltage processes are used to ensure signal transmission isolation, then insulation reliability is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent changes the voltage withstand parameter from high to low-to-middle range by modifying the circuit configuration. The transmission circuit outputs pulse-driven control signals that enable effective signal transmission through low-to-middle-withstand-voltage circuits, eliminating the need for high-withstand-voltage processes while maintaining insulation reliability between primary and secondary circuits
Solution Approach 2:
The patent replaces the physical high-withstand-voltage process (mechanical/thermal processing) with a circuit-level solution. By using pulse-driven control signals and specific circuit configurations (transmission circuit, reception circuit, and insulating circuit), the patent achieves electrical isolation without requiring costly high-withstand-voltage manufacturing processes
2Manufacturing precision
If pulse-driven control signals are used for switch operation, then switch control precision is improved, but circuit complexity increases
Solution Approach 1:
The patent segments the control function into distinct modules: transmission circuit for generating pulse-driven control signals, insulating circuit for voltage isolation, and reception circuit for processing signals. This segmentation enables precise switch control through dedicated pulse generation while managing complexity through functional separation
Solution Approach 2:
The patent introduces pulse-driven control signals as an intermediary mechanism between the transmission circuit and the switch. These control signals act as a mediator that translates input signals into precise switch operations, improving control precision while the modular circuit structure manages the associated complexity
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
Reduces manufacturing costs by using common low-to-middle-withstand-voltage processes, while maintaining effective signal transmission and switch control in vehicle-mounted applications.
Implementation Method 1
The insulating circuit is configured to transmit the control signal while insulating an area between the transmission circuit and the reception circuit
Data Source
AI summary
A signal transmission device includes a transmission circuit which outputs a control signal, a reception circuit and an insulating circuit. The reception circuit receives an input of an external signal. The reception circuit drives a drive target switch based on the control signal in a state where the external signal is at a first logic level at which the voltage of the external signal is equal to or lower than a first threshold voltage, and drives and controls the drive target switch based on the external signal regardless of the control signal in a state where the external signal is at a second logic level at which the voltage of the external signal is higher than the first threshold voltage.