Locomotive Chopper Circuit for Precise Dynamic Braking Control
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Solution Overview
Problem
Existing locomotive systems face inefficiencies in dynamic braking due to complex and costly circuits that fail to precisely control voltage and current transfer between traction motors, energy storage devices, and resistor grids, leading to impaired efficiency and lack of fine control during regenerative braking.
Innovation Solution
A chopper circuit with variable switching frequency power semiconductors, controlled by an energy management device, connects traction motors, energy storage devices, and resistor grids, enabling precise control of current and power distribution across the DC power bus, allowing for improved dynamic braking functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a chopper circuit with variable switching frequency power semiconductors is implemented, then manufacturing precision and control precision are improved, but device complexity increases
Solution Approach 1:
The patent implements a chopper circuit with power semiconductors that have variable switching frequency, allowing the circuit to dynamically adjust its operation. This enables precise control of voltage and current transfer between the traction motor, energy storage device, and resistor grid, resolving the technical contradiction by improving control precision through dynamic frequency adjustment while managing circuit complexity through integrated design
Solution Approach 2:
The patent changes the switching frequency parameter of the power semiconductors in the chopper circuit to achieve precise control. By varying the switching frequency, the system can optimize power transfer efficiency and control voltage/current distribution, thereby improving manufacturing precision and control precision while the integrated circuit design manages the complexity increase
2Device complexity
If existing complex circuits are used for dynamic braking, then device complexity is reduced, but measurement precision and control precision deteriorate
Solution Approach 1:
The patent introduces variable switching frequency capability in the chopper circuit, enabling dynamic adjustment of power semiconductor operation. This dynamic control mechanism provides fine control over voltage and current supply to the traction motor, energy storage device, and resistor grid, achieving high measurement precision and control precision while maintaining manageable circuit complexity through integrated architecture
Solution Approach 2:
The energy management device monitors and controls the chopper circuit operation, implementing feedback mechanisms that adjust power semiconductor switching based on real-time system conditions. This feedback control enables precise measurement and control of voltage and current parameters, resolving the contradiction between circuit simplicity and control precision by using intelligent control algorithms
3Loss of energy
If regenerative braking is implemented without precise control, then energy recapture is achieved, but productivity and efficiency are impaired
Solution Approach 1:
The variable switching frequency power semiconductors in the chopper circuit enable dynamic optimization of energy recapture during regenerative braking. By adjusting the switching frequency, the system maximizes energy transfer efficiency between the traction motor and energy storage device, improving both energy recapture and overall locomotive productivity through optimized power management
Solution Approach 2:
The patent optimizes the switching frequency parameter of the power semiconductors to enhance energy recapture efficiency. By changing the switching frequency based on operational conditions, the system achieves maximum energy transfer during regenerative braking while maintaining high productivity and efficiency, resolving the contradiction between energy recapture and locomotive performance
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 enables precise power balancing and efficient energy recapture during dynamic braking, enhancing locomotive efficiency and reducing costs by allowing for finer control over voltage and current supply to traction motors, energy storage devices, and resistor grids.
Implementation Method 1
a plurality of power semiconductors, each having a variable switching frequency, which control a current through each of the armature, the field winding, the energy storage device, and the resistor grid
Implementation Method 2
an energy storage device capable of capturing electric power from and supplying electric power to the DC power bus
Implementation Method 3
a resistor grid capable of dissipating electric power as heat
Implementation Method 4
a traction motor capable of operating in a motoring mode and a dynamic braking mode
Data Source
AI summary
A locomotive, a first chopper circuit, and a second chopper circuit integrating a traction motor with an energy storage device are disclosed. The locomotive includes a prime mover, an energy management device, a DC power bus, a traction motor, an energy storage device, a resistor grid, and a chopper circuit. Each chopper circuit is controlled by the energy management device and includes a plurality of power semiconductors with variable switching frequency. The traction motor may be capable of operating in a motoring mode, where power is controllably supplied by either the prime mover and/or the energy storage device; and a dynamic braking mode, where generated power is controllably allocated to the energy storage device and/or the resistor grid.