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Hybrid PWM control method and hybrid PWM control device

A control method and technology of a control device, which are applied in the control/regulation system, the conversion device of output power, and the adjustment of electrical variables, etc., can solve the problems of large loss of the converter, and achieve the effect of reducing the switching frequency and increasing the turn-on time.

Active Publication Date: 2019-07-09
ZHENGZHOU YUTONG BUS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to provide a hybrid PWM control method and device for solving the problem of large converter loss

Method used

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  • Hybrid PWM control method and hybrid PWM control device
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  • Hybrid PWM control method and hybrid PWM control device

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Embodiment Construction

[0048] 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.

[0049] The present invention provides a hybrid PWM control device, including a processor and a memory, the processor is used to process instructions stored in the memory, and is used to realize a hybrid PWM control method, the control method has 3 functions for controlling the duty cycle segment, the control among the three segments is independent of each other. Among them, in the 0-k2 section: perform PWM control; in the k2-k1 section: perform frequency modulation + PWM control; after k1 section: perform PWM control. In this embodiment, taking a three-level converter as an example, the flowchart of the hybrid PWM control method is as follows Figure 5 As shown, it specifically includes the following steps:

[0050] (1) Detect the output...

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PUM

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Abstract

The invention relates to a hybrid PWM control method and a hybrid PWM control device. The hybrid PWM control method comprises the steps of: detecting an output voltage and an output current of a converter in real time, and further calculating a PI control output value; judging the PI control output value, and if the PI control output value is judged to be smaller than a first control parameter andlarger than a second control parameter, setting switch-on time of a switching tube in the converter as a function of the output voltage of the converter so as to reduce the frequency of the switchingtube, wherein the larger the output voltage of the converter is, the larger the switch-on time of the switching tube in the converter is; and controlling the converter according to the set switch-ontime of the switching tube in the converter. Through adoption of the hybrid PWM control method of the invention, the switch-on time of a frequency converter can be increased, and the switching frequency of a power supply is controlled and reduced at the same time, and the reduction of the switching frequency can reduce the loss of a power device and a magnetic device.

Description

technical field [0001] The invention relates to a hybrid PWM control method and device, belonging to the technical field of new energy vehicles. Background technique [0002] With the commercialization of the new energy industry and the country's requirements for energy conservation and emission reduction, high-voltage and high-power power supplies have gradually become the trend of power supply development. The application of power electronics is developing in the direction of high integration and high efficiency, and at the same time, higher requirements are put forward for the management of power supply. [0003] In the field of on-board charging of new energy vehicles, the three-level BUCK circuit, that is, the three-level DC converter, is a non-isolated topology that is widely used. Its structure diagram is shown in figure 1 As shown, it includes two voltage dividing capacitors C1 and C2, two power switches Q1 and Q2, two freewheeling diodes D1 and D2, filter inductor ...

Claims

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Application Information

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IPC IPC(8): H02M3/155
CPCH02M3/155H02M1/0048H02M1/0054Y02B70/10
Inventor 宁小磊肖兴兴
Owner ZHENGZHOU YUTONG BUS CO LTD