Multi-System Power Converter Pre-Charging Circuit
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Solution Overview
Problem
Conventional multi-system power converter arrangements for rail vehicles require significant installation space and maintenance due to separate pre-charging circuits for AC and DC networks, necessitating the removal of the entire converter to replace pre-charging resistors.
Innovation Solution
A multi-system power converter arrangement that uses a single pre-charging circuit with a switching group to couple a shared pre-charging resistor to both AC and DC networks, eliminating the need for separate resistors and reducing maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate pre-charging circuits with separate pre-charging resistors are provided for AC and DC networks, then the intermediate circuit can be precharged from both networks, but the installation work and space required increase significantly
Solution Approach 1:
The pre-charging circuit is designed to serve dual purposes: it can pre-charge the intermediate circuit from both AC and DC networks using a single pre-charging resistor. The switching group enables the circuit to be coupled to either network type, making the pre-charging infrastructure universal rather than requiring separate dedicated circuits for each network type.
Solution Approach 2:
Separate pre-charging circuits for AC and DC networks are merged into a single unified pre-charging circuit. The switching group acts as a coupling mechanism that allows one pre-charging resistor to be connected to either the AC network or the DC network, combining what were previously two distinct functions into one shared resource.
2Reliability
If separate pre-charging circuits with separate pre-charging resistors are provided for AC and DC networks, then the intermediate circuit can be precharged from both networks, but the maintenance and repair work required increase significantly
Solution Approach 1:
The pre-charging circuit is designed to serve dual purposes: it can pre-charge the intermediate circuit from both AC and DC networks using a single pre-charging resistor. The switching group enables the circuit to be coupled to either network type, making the pre-charging infrastructure universal rather than requiring separate dedicated circuits for each network type.
Solution Approach 2:
Separate pre-charging circuits for AC and DC networks are merged into a single unified pre-charging circuit. The switching group acts as a coupling mechanism that allows one pre-charging resistor to be connected to either the AC network or the DC network, combining what were previously two distinct functions into one shared resource.
3Area of stationary object
If a single pre-charging resistor is shared between AC and DC networks, then production costs and space requirements are reduced, but the switching group must be used to couple the resistor to the appropriate network
Solution Approach 1:
The pre-charging circuit is designed to serve dual purposes: it can pre-charge the intermediate circuit from both AC and DC networks using a single pre-charging resistor. The switching group enables the circuit to be coupled to either network type, making the pre-charging infrastructure universal rather than requiring separate dedicated circuits for each network type.
Solution Approach 2:
The switching group acts as an intermediary element that mediates between the single pre-charging resistor and the two different network types (AC and DC). It provides the necessary coupling mechanism that allows one resistor to interface with both network types without requiring direct permanent connections to both.
4Ease of repair
If a single pre-charging resistor is shared between AC and DC networks, then production costs and maintenance efforts are reduced, but the switching group must be used to couple the resistor to the appropriate network
Solution Approach 1:
The pre-charging circuit is designed to serve dual purposes: it can pre-charge the intermediate circuit from both AC and DC networks using a single pre-charging resistor. The switching group enables the circuit to be coupled to either network type, making the pre-charging infrastructure universal rather than requiring separate dedicated circuits for each network type.
Solution Approach 2:
The switching group acts as an intermediary element that mediates between the single pre-charging resistor and the two different network types (AC and DC). It provides the necessary coupling mechanism that allows one resistor to interface with both network types without requiring direct permanent connections to both.
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 design reduces production costs, space requirements, and maintenance efforts by allowing a single pre-charging resistor to be used for both AC and DC operations, improving the reliability of the converter arrangement.
Implementation Method 1
an ohmic pre-charging resistor is provided to limit the current during pre-charging
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a multi-system power converter arrangement (1) for supplying a rail vehicle electrical drive motor (17, 18) from either an alternating current network (2) or from a direct current network (3). Said multi-system power converter arrangement (1) comprises a direct current intermediate circuit (4) that connects a network-side power converter (13, 15) to a load-side power converter (14, 16), as well as a pre-charge switching circuit (53), which comprises at least one pre-charge resistor (45, 47), for pre-charging said direct current intermediate circuit (4). Using a switching assembly, said pre-charge resistor (45, 47) can be optionally coupled to the alternating current network (2) or to the direct current network (3) for the purpose of pre-charging said direct current intermediate circuit (4).