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Converter control method and device

A control method and converter technology, which are applied to output power conversion devices, control/regulation systems, and DC power input conversion to DC power output, etc. The effect of changing the duty cycle and avoiding the phenomenon of uneven voltage

Inactive Publication Date: 2019-07-19
ZHENGZHOU YUTONG BUS CO LTD
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  • Summary
  • Abstract
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Problems solved by technology

[0015] The object of the present invention is to provide a control method and device for a converter, which is used to solve the problem that the converter is damaged due to uneven voltage of the voltage dividing capacitor

Method used

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  • Converter control method and device
  • Converter control method and device

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] The present invention provides a converter control device, the control device includes a processor and a memory, the processor is used to process instructions stored in the memory to implement a converter control method. Among them, the processor is implemented by digital DSP, which effectively improves the control accuracy and stability. Certainly, as other implementation manners, the digital DSP can also be replaced by other types of processors.

[0036] Among them, the structural diagram of the control method for realizing the converter is as follows: Figure 4 shown, including the following steps:

[0037] (1) Collect the voltage of the first voltage dividing capacitor and the voltage of the second voltage dividing capacitor o...

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Abstract

The invention relates to a control method and device for a converter, and the method comprises the steps: superposing a voltage regulation control quantity on a voltage loop output control quantity ofa three-level converter power switch as a final control quantity of the three-level converter power switch; calculating the difference between a first voltage-dividing capacitor voltage and a secondvoltage-dividing capacitor voltage of the three-level converter, and performing the adjustment through a first adjuster to obtain the voltage adjustment control quantity. The voltages of the two voltage dividing capacitors of the three-level converter are collected, and the voltage loop output control quantity of the three-level converter power switch is corrected according to the voltage difference value of the two voltage dividing capacitors, so that the duty ratio of the power switch in the three-level converter is effectively changed, and the phenomenon of non-uniform voltage of the two voltage dividing capacitors is avoided.

Description

technical field [0001] The invention relates to a control method and device for a converter, belonging to the technical field of new energy vehicles. Background technique [0002] With the development of new energy vehicles, wireless charging is developing towards high power, and high-power DC charging has become the development trend of new energy technology. In order to improve efficiency and increase power density, the bus voltage is generally increased to above 800V. For common MOS transistors of 650V, the voltage stress exceeds the standard by a lot. If 1200V MOS is selected, the cost will increase significantly, and its on-resistance is much larger than that of 650V, which is not conducive to the improvement of efficiency. [0003] The proposal of the three-level DC converter can solve the problem of voltage stress and effectively reduce the stress of the switch tube. The three-level DC converter topology is very suitable for high-voltage and medium-to-high-power app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/156H02M1/0025
Inventor 宁小磊肖兴兴
Owner ZHENGZHOU YUTONG BUS CO LTD
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