Switch-Driving Circuit With High-Voltage Isolation Pulse Transformer
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Solution Overview
Problem
Traditional switch-driving circuits for full-controlled power switch components face challenges in transmitting driving signals effectively due to differences in signal requirements compared to half-controlled power switch components, leading to instability, increased costs, and complexity in high-power electronic systems.
Innovation Solution
A switch-driving circuit utilizing a high-voltage isolation pulse transformer module with magnetic cores, primary, and secondary windings, coupled with pulse-width modulators and driving-power amplifiers, to transmit driving signals to full-controlled power switches in a magnetic isolation manner, ensuring stable and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual optical fibers are used for each power switch component, then electrical isolation between components is achieved, but system costs and complexity significantly increase
Solution Approach 1:
The patent merges multiple isolation functions into a single pulse transformer with multiple secondary windings. One primary winding receives the control signal and multiple secondary windings provide isolated outputs to multiple power switch components, eliminating the need for separate optical fibers for each component and reducing system complexity.
Solution Approach 2:
The pulse transformer serves multiple functions simultaneously: it provides electrical isolation between high-voltage and low-voltage sides, isolates multiple power switch components from each other, transmits control signals, and reduces system complexity. This multi-functional design eliminates the need for separate isolation systems for each component.
2Reliability
If optical fibers are used for signal transmission, then electrical isolation is achieved, but delay time increases and signal synchronization becomes poor
Solution Approach 1:
The patent replaces optical fiber transmission with magnetic coupling through a pulse transformer. Magnetic coupling provides faster signal transmission with lower delay time while maintaining electrical isolation, thus resolving the time loss issue associated with optical fiber transmission.
3Ease of manufacture
If traditional pulse transformer is used for half-controlled power switch components, then driving signals can be transmitted, but it cannot meet the requirements of full-controlled power switch components which need stable voltage levels and longer pulse-width
Solution Approach 1:
The patent applies different winding configurations to different secondary windings of the pulse transformer. Each secondary winding can be optimized for specific full-controlled power switch requirements, providing appropriate voltage levels and pulse-width characteristics while maintaining the overall simplicity of the transformer structure.
Solution Approach 2:
The patent modifies the pulse transformer design by using multiple secondary windings with different turns ratios and configurations. This allows the transformer to provide different voltage levels and pulse-width characteristics to meet the specific requirements of full-controlled power switch components while maintaining electrical isolation.
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 provides fast-response, stable, and reliable driving signals to full-controlled power switch combinations, enhancing system stability and reducing costs and complexity by enabling magnetic isolation and synchronized signal transmission.
Implementation Method 1
the driving signals at low-voltage side transmits through a transformer, so as to induce triggering pulses to multiple half-controlled power switch components connected in series at the high-voltage side
Implementation Method 2
Utilizing a magnetic isolation structure, instead of the optical fibers, for transmitting the driving signal and realizing the electrical isolation
Data Source
AI summary
A switch-driving circuit suitable for driving a full-controlled power switch combination is disclosed. The switch-driving circuit includes a first pulse-width modulator, a high-voltage isolation pulse transformer module and a plurality of output modules. The high-voltage isolation pulse transformer module includes a magnetic core connected to multiple output modules in a one-to-many way, or includes multiple magnetic cores connected to multiple output modules in a one-to-one way. Each output module includes a second pulse-width modulator and a driving-power amplifier. The full-controlled power switch combination includes a plurality of full-controlled power switches. The driving-power amplifier is coupled between the second pulse-width modulator and one of the full-controlled power switches.