Transformer Bridge Control for Isolated Semiconductor Switching
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Solution Overview
Problem
Existing semiconductor switch control systems in electric-motor-operated driving machines lack efficient bidirectional current handling and require additional galvanic isolation, leading to increased complexity and component count.
Innovation Solution
A method and device utilizing a transformer-based bridge circuit to transmit control signals and power to a driver circuit for a semiconductor switch, enabling galvanic isolation and reducing component count by using a threshold signal to control the semiconductor switch, with optional amplification and overcurrent protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a transformer-based bridge circuit is used to transmit control signals and power, then galvanic isolation is achieved and component count is reduced, but switching delay time increases due to transformer response time
Solution Approach 1:
The transformer is pre-configured with optimized winding ratios and magnetic core characteristics before operation to minimize response time. The bridge circuit is designed with predetermined switching sequences that account for transformer characteristics, allowing the system to achieve rapid switching despite the inherent transformer response time.
Solution Approach 2:
The system dynamically adjusts operating parameters such as switching frequency and voltage levels to optimize transformer response. By changing these parameters in real-time, the system minimizes switching delay while maintaining galvanic isolation and reducing overall component count.
2Reliability
If additional galvanic isolation means are added to the system, then safety and isolation performance improve, but device complexity and component count increase
Solution Approach 1:
The patent combines the galvanic isolation function with the power transmission function by using a single transformer for both purposes. The bridge circuit integrates control signal transmission and power delivery through the same transformer, eliminating the need for separate isolation components and reducing overall device complexity while maintaining reliable galvanic isolation.
Solution Approach 2:
The transformer is designed to perform multiple functions simultaneously: galvanic isolation, control signal transmission, and power delivery. This multi-functional approach eliminates the need for additional dedicated isolation components, reducing component count while maintaining safety and isolation performance.
3Speed
If the bridge circuit is driven with high power to reduce switching delay, then switching speed improves, but energy consumption and heat generation increase
Solution Approach 1:
The bridge circuit employs periodic switching with optimized duty cycles that deliver high power only during the brief periods when switching occurs, rather than continuous high power operation. This periodic action achieves fast switching speeds while minimizing overall energy consumption and heat generation during steady-state operation.
Solution Approach 2:
The system maintains continuous useful action through optimized energy transfer during switching transitions, ensuring that high power is applied only when necessary for switching, while during steady-state conduction, lower power levels are used to minimize energy consumption while maintaining the switching capability when needed.
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 achieves low switching delay times, eliminates the need for additional galvanic isolation, and integrates undervoltage protection, resulting in a compact, efficient electronic switching device capable of bidirectional current handling.
Implementation Method 1
the primary signal is generated on the output side at a primary winding of the transformer... The primary signal is then transmitted by the transformer as a secondary signal to the load circuit
Implementation Method 2
the transformer also transfers energy required for operating the driver circuit to the load circuit
Data Source
AI summary
A method for controlling an electronic semiconductor switch connected in a load current circuit, the semiconductor switch being connected between an input terminal routed to a source and an output terminal of the load current circuit routed to a load. A control circuit is connected to a supply voltage and has a bridge circuit connected on the primary side to a transformer and to the supply voltage. A load circuit is connected to the transformer on the secondary side, the load circuit having a driver circuit for the semiconductor switch. A threshold value signal is routed to the bridge circuit on the control side. The bridge circuit generates a primary signal which is transmitted as a secondary signal to the load circuit that is galvanically isolated from the control circuit, and wherein the secondary signal is fed to the driver circuit, which generates a drive signal for the semiconductor switch.