Simplified converter circuit and converter device

Abstract

The invention provides a simplified converter circuit, and the circuit comprises a power module, wherein the input end of the power module is connected with an external direct current traction network through a direct current switch cabinet, the power module is used for carrying out voltage transformation and frequency conversion inversion on a direct current power supply to obtain a three-phase alternating current power supply, the power module comprises a first power module and a second power module which have the same circuit structure, and the power module is compatible with various DC voltage levels; a low-voltage circuit breaking module, wherein the first end of the low-voltage circuit breaking module is connected with the power modules, the second end of the low-voltage circuit breaking module is connected with an external transformer valve side winding, and the low-voltage circuit breaking module comprises a first low-voltage circuit breaker and a second low-voltage circuit breaker which are connected with the first power module and the second power module respectively; a charging module which is connected with the power modules and the low-voltage circuit breaking module and comprises a first charging contactor, a second charging contactor, a third resistor and a fourth resistor, wherein the first charging contactor and the second charging contactor are connected with the first power module and the second power module respectively. The method is compatible with at least two voltage systems at the same time, meets different power level requirements, and improves the life cycle efficiency of the converter.

Description

technical field

[0001] The invention relates to the technical field of converters, in particular to a simplified converter circuit and a converter device. Background technique

[0002] The converter usually uses a power switching device, such as an insulated gate bipolar transistor (Insulate Gate Bipolar Transistor, IGBT), to realize the conversion of AC and DC energy. Different subways and urban rail lines often require different voltages and power levels. In the prior art, when the voltage levels are different, the converter needs to be redesigned.

[0003] Specifically, when the required power is not much different, it will be wasteful to use multiple same converters to output in parallel; therefore, due to the diversity of requirements, it is often necessary to redesign converters with different voltages and power levels, and the development cycle is long. , affects the efficiency of the product's entire life cycle, and is not conducive to the platformization of the pr...

Examples

Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] At present, with the rapid development of rail transit, the regenerative braking energy produced by urban rail trains has changed from the previous resistance consumption to energy reuse and storage with high efficiency and energy saving and higher economic value. The green, efficient and energy-saving green transportation system is the The current development direction, therefore, the regenerative braking feedback device is given priority in new lines. However, the urban rail power supply voltage system in my country is basically divided into DC750V and DC1500V, which has limitations in the design of converters, and it is impossible to achieve a minimum of one converter. Compatible with two power supply voltage systems at the same time, aff...

technical field

[0001] The invention relates to the technical field of converters, in particular to a simplified converter circuit and a converter device. Background technique

[0002] The converter usually uses a power switching device, such as an insulated gate bipolar transistor (Insulate Gate Bipolar Transistor, IGBT), to realize the conversion of AC and DC energy. Different subways and urban rail lines often require different voltages and power levels. In the prior art, when the voltage levels are different, the converter needs to be redesigned.

[0003] Specifically, when the required power is not much different, it will be wasteful to use multiple same converters to output in parallel; therefore, due to the diversity of requirements, it is often necessary to redesign converters with different voltages and power levels, and the development cycle is long. , affects the efficiency of the product's entire life cycle, and is not conducive to the platformization of the pr...

Examples

Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] At present, with the rapid development of rail transit, the regenerative braking energy produced by urban rail trains has changed from the previous resistance consumption to energy reuse and storage with high efficiency and energy saving and higher economic value. The green, efficient and energy-saving green transportation system is the The current development direction, therefore, the regenerative braking feedback device is given priority in new lines. However, the urban rail power supply voltage system in my country is basically divided into DC750V and DC1500V, which has limitations in the design of converters, and it is impossible to achieve a minimum of one converter. Compatible with two power supply voltage systems at the same time, aff...

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