Multi-Input Power Supply Circuit Switching Control
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Solution Overview
Problem
Conventional multi-input power supply circuits with a single transformer face challenges in preventing momentary interruptions during switching operations, as insulation delays and simultaneous switching of multiple systems can lead to power return to input systems, and the use of multiple converters increases circuit size and decreases efficiency.
Innovation Solution
A multi-input power supply circuit with a transformer having windings connected to switching devices and transistors in series, where the operations of these devices and transistors are controlled to prevent current return and minimize voltage drop losses by synchronizing switching operations among multiple power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plurality of insulated windings and switching circuits are used to secure insulation, then insulation is improved, but a delay time is generated when switching is made among switching systems
Solution Approach 1:
The patent divides the switching operation into two distinct phases: first turning off the switching device of the current power supply system, then turning on the switching device of the target power supply system. This segmentation of the switching process allows for proper insulation between systems while minimizing the total switching delay time by avoiding simultaneous operation of both systems.
2Speed
If the delay time caused by the switching is reduced too much, then switching speed is improved, but switching devices of two or more switching systems are turned ON at the same time
Solution Approach 1:
The patent applies preliminary action by turning off the switching device of the current power supply system before turning on the switching device of the target system. This preliminary shutdown of the first system prevents the harmful effect of simultaneous switching, ensuring that power does not return to the input system while maintaining fast switching response.
3Adaptability or versatility
If a combination of a plurality of converters is used, then power supply versatility is improved, but the size of the circuit is increased and efficiency is decreased
Solution Approach 1:
The patent merges multiple power supply systems (AC power supply and DC power supply) into a single integrated circuit structure with one transformer that has multiple windings. By combining the AC and DC power supply circuits sharing common components like the transformer and control circuit, the patent reduces the overall circuit size and improves efficiency while maintaining the versatility to accept multiple input types.
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 ensures continuous power supply to the load circuit without momentary interruptions, reduces power loss, and maintains efficiency by using a single transformer for multiple inputs, thereby simplifying the circuit design and preventing power return to input systems.
Implementation Method 1
a transformer including windings corresponding to the plurality of power supplies
Data Source
AI summary
A multi-input power supply circuit includes a plurality of power supplies such as an alternating-current power supply, a direct-current power supply, and two batteries; a transformer including windings corresponding to the plurality of power supplies; switching devices for performing switching operations and transistors for preventing inverse currents, the switching devices and the transistors being connected in series to the windings, respectively; and a control circuit for controlling the switching operations of the switching devices and on and off operations of the transistors. The windings include those windings configured to form primary windings and a winding configured to form a load winding.