Power Supply Apparatus for High Voltage Platforms
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Solution Overview
Problem
Existing power supply systems for loads on high potential platforms relative to ground are inefficient and lack effective protection against over-powering, requiring substantial energy storage and complex control mechanisms.
Innovation Solution
A power supply apparatus comprising a coupling capacitor, a transformer with rectifier bridges, and an energy storage system, along with a bidirectional bypass circuit using controlled semiconductor components and a controller to manage power flow and prevent over-powering, utilizing a transformer with a primary winding connected to a high voltage transmission line and a secondary winding connected to the load, with a bypass mechanism to control current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a transformer with rectifier bridge is used to supply power to loads on high potential platforms, then auxiliary power can be provided efficiently, but the load may be over-powered due to the stiff current source characteristic
Solution Approach 1:
A bypass circuit is introduced as an intermediary element between the transformer and the load. This bypass circuit includes a semiconductor switch that can divert excess current away from the load, preventing over-powering while allowing the transformer to continue providing substantial power capability. The bypass circuit acts as a mediator that protects the load from the stiff current source characteristic of the transformer-rectifier combination.
2Productivity
If substantial power is provided to charge energy storage in reasonable time, then fast-acting actuators can be powered, but complex control mechanisms are required to manage power flow
Solution Approach 1:
The bypass circuit incorporates a dynamically controllable semiconductor switch that can rapidly adjust its conduction state based on power flow requirements. This dynamic element allows the system to quickly charge energy storage devices when needed while automatically regulating power flow to prevent over-powering, thereby achieving fast charging without requiring complex external control mechanisms.
Solution Approach 2:
The bypass circuit with semiconductor switch is designed to automatically regulate power flow based on system conditions without requiring external control signals. The circuit self-adjusts to divert excess current when the load requires protection, enabling the system to manage its own power distribution and protecting itself from over-powering conditions.
3Reliability
If controlled semiconductor components are used in bypass circuit, then protection against over-powering is achieved, but device complexity increases
Solution Approach 1:
The bypass circuit uses simple semiconductor switches that are robust and straightforward in design, prioritizing reliability and protection functionality over minimal complexity. These semiconductor components, while adding some complexity, provide substantial protection capability and can be easily replaced if needed, following the philosophy of using simple, replaceable components rather than attempting to reduce complexity at the expense of protection 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
Simplifies power supply to high potential platforms by leveraging voltage differences to ground, providing reliable and controlled auxiliary power while protecting against over-powering, suitable for high voltage transmission lines up to 765 rms line-to-line, and allowing for flexible control and additional security measures.
Implementation Method 1
a transformer (5) comprising a primary winding (15) and a secondary winding (16)
Implementation Method 2
a first rectifier bridge (6) connected in parallel with the secondary winding (16)
Data Source
Figure 1~2
Figure 3~4
Figure 5a~6
AI summary
It is presented a power supply apparatus comprising: a coupling capacitor arranged to be connected on its first end to ground; a transformer comprising a primary winding and a secondary winding; a first rectifier bridge connected in parallel with the secondary winding; and an energy storage, to which a load is arranged to be connected. The primary winding is connected on its first end to a second end of the coupling capacitor, and the second end of the primary winding is arranged to be connected to a high voltage transmission line. The energy storage is arranged to be charged by means of a current passing through the first rectifier bridge. Furthermore, the power supply apparatus comprises a bypass means. A corresponding three-phase apparatus is also presented.