Power Conversion Device Protection Signal Transmission
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Solution Overview
Problem
Existing electronic power devices face high manufacturing costs and reliability issues due to the use of optical-isolation components for transmitting fault signals, and a complex structure resulting from the need for individual isolated pulse transformers for each power semiconductor switch.
Innovation Solution
A power conversion device utilizing a single isolated pulse transformer and protection signal processing circuit to transmit fault signals, simplifying the structure and reducing costs by using a signal magnetic-isolating unit to isolate and transmit protection signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical-isolation components are used to transmit fault signals, then signal isolation is achieved, but manufacturing cost increases and reliability decreases
Solution Approach 1:
The patent extracts the isolation function from traditional optical-isolation components and implements it through a different mechanism - using the pulse transformer's inherent galvanic isolation capability combined with specific circuit configuration. This removes the need for separate optical-isolation components while maintaining signal isolation, thereby reducing manufacturing cost and improving reliability.
Solution Approach 2:
The patent introduces a protection signal processing circuit as an intermediary that processes fault signals through the pulse transformer's isolation capability. This intermediary circuit enables signal transmission with isolation without requiring optical components, achieving the same isolation effect through electromagnetic coupling instead of optical coupling.
2Reliability
If individual isolated pulse transformers are used for each power semiconductor switch, then fault signal transmission is achieved, but device structure becomes complicated
Solution Approach 1:
The patent merges the functions of multiple isolated pulse transformers into a single pulse transformer by configuring multiple power semiconductor switches to share one transformer. The protection signal processing circuit combines fault signals from multiple switches and transmits them through the single transformer, thereby simplifying the structure while maintaining reliable fault signal transmission for all switches.
Solution Approach 2:
The single pulse transformer is designed to serve multiple functions - it handles both the driving signals for multiple power semiconductor switches and the fault signal transmission for all those switches. This multi-functional design eliminates the need for separate transformers for each switch, reducing structural complexity while preserving reliability.
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 reduces manufacturing costs and enhances reliability by eliminating the need for multiple isolated pulse transformers and optical-isolation components, while maintaining effective fault signal transmission and device operation.
Implementation Method 1
an isolated pulse transforming unit to receive the protection pulse signal, and output the protection pulse signal
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A power conversion device includes a power semiconductor switch module (150), a driving signal-transmitting circuit (120), a plurality of failure-detecting circuits (140), a protection signal transmitting circuit (130) and a control circuit (110). The driving signal transmitting circuit receives a control signal and generates a driving signal according to the control signal to drive the power semiconductor switch module. The failure detecting circuits generate a fault signal when they detect that one of the power semiconductor switches and/or the driving signal transmitting circuit is malfunctioning. The isolated pulse transforming unit of the protection signal transmitting circuit receives a corresponding fault pulse signal generated according to the fault signal, and outputs a protection pulse signal. The control circuit generates the control signal and receives a protection signal generated according to the protection pulse signal. The control circuit generates a turn off signal according to the protection signal to turn off the power semiconductor switch module.