Method for controlling uniform heating of switch device of switch power source

A switching device and switching power supply technology, which is applied in the direction of electrical components, control/regulation systems, instruments, etc., can solve the problem of uneven heating of switching devices, and achieve the effect of prolonging life and uniform heating

Inactive Publication Date: 2015-05-06
SICHUAN INJET ELECTRIC CO LTD +1
4 Cites 98 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem of uneven heating of each switching device in a switching power supply comprising multiple switching devices, and to provide a control method for uniform heating of switching devices in a switching power supply that can make each switching device generate heat evenly and effectively prolong the life of the switching device , the switching power supply includes a full-bridge converter, the switching device in the full-bridge converter is a switching tube, and the switching devic...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Abstract

The invention relates to the field of switch power source control, in particular to a method for controlling uniform heating of switch devices of a switch power source. The switch power source comprises a full bridge converter, the switch devices in the full bridge converter are switch tubes, the sequence of the switch devices in the full bridge converter alternately changes periodically, and the alternating period is N times of the switch control period of the switch devices, wherein N refers to a natural number larger than 2. Alternate soft turnoff of the switch devices is realized by alternately changing turnoff sequence of the switch devices composed of the switch tubes of the full bridge converter in the switch power source, so that the switch devices are uniform in heating within a long time period, and service life of the whole switch power source is prolonged.

Application Domain

Technology Topic

PhysicsFull bridge converter +5

Image

  • Method for controlling uniform heating of switch device of switch power source
  • Method for controlling uniform heating of switch device of switch power source
  • Method for controlling uniform heating of switch device of switch power source

Examples

  • Experimental program(3)

Example Embodiment

[0017] Embodiment 1: The purpose of this embodiment is to overcome the problem of uneven heating of each switching tube in a switching power supply including switching tubes, and to provide a method for controlling uniform heating of switching power supply switching tubes. The switching power supply includes a full-bridge converter, The structure of the full-bridge converter is figure 1 As shown, the four switching devices Q1 (first switching device), Q2 (second switching device), Q3 (third switching device), and Q4 (fourth switching device) in the full-bridge converter are all switching devices. , The switching device sequence (that is, the turn-on or turn-off sequence) of each switching device in the full-bridge converter is cycle alternately, that is, the switching device as the leading arm and the switching device as the lagging arm are cycled alternately, The alternating period Tp is twice the switching control period Ts of each switching device; that is, one alternating period Tp includes two switching control periods Ts, among which, for example, Q1 and Q1 in the first switching control period Ts in an alternating period Tp Q2 constitutes the lagging arm, Q3 and Q4 constitute the leading arm, and in the second switching control period Ts in the same alternating period Tp, Q1 and Q2 constitute the leading arm, and Q3 and Q4 constitute the lagging arm.
[0018] Such as image 3 As shown, t0~t12 is an alternating period Tp, in which the time period t0~t6 is a switch control period Ts, and the time period t6~t12 is another switch control period Ts; among them, in the time period t0~t6 (ie During the first switching control period Ts), Q1 and Q2 are 180° turn-on complement each other. When Q3 and Q4 turn off, the current is the largest, which is hard turn-off; Q1 and Q2 lag behind Q3 and Q4 turn-off, and the current is turned off Is 0, soft turn-off (such as image 3 , Q4 is turned off at t1, and Q1 is turned off until t3; on the contrary, in the time period from t6 to t12 (that is, during the second switching control period Ts), Q3 and Q4 are turned on at 180° each other Complementary, when Q1 and Q2 turn off, the current is the largest, which is hard turn-off. Q3 and Q4 lag behind Q1 and Q2 turn off. When turned off, the current is 0, which is soft turn-off (such as image 3 , Q1 turns off at t7, and Q4 turns off until t9).
[0019] After t12, the turn-off sequence of the four switching devices Q1, Q2, Q3, and Q4 repeats the above process. From a long-term perspective, the bridge arm composed of the switching devices Q1 and Q2 is turned off first during half of the working time, which is a hard turn-off After the bridge arm composed of Q3 and Q4 is turned off, it is soft turn-off; while the bridge arm composed of switching devices Q3 and Q4 is turned off first for the other half of the working time, and the bridge arm composed of Q1 and Q2 is turned off afterwards. Soft shutdown. In this way, within a certain working time, the states of the switching devices of the switching tubes constituting the four switching devices are consistent, and the heat generation and switching stress are the same.

Example Embodiment

[0020] Example 2: Such as Figure 4 As shown, each switching device in the full-bridge converter is composed of two or more switching tubes in parallel, and the control pulses of the two or more switching tubes constituting each switching device are the same. That is, the switching tubes Q11~Q1n are connected in parallel to receive the same switching tube control pulse; Q21~Q2n are connected in parallel to receive the same switching tube control pulse; Q31~Q3n are connected in parallel to receive the same switching tube control pulse; Q41~Q4n are connected in parallel to receive the same switching tube control pulse. Switch tube control pulse; four groups of pulse signals can be pressed image 3 The control pulse generation method shown can realize parallel IGBTs.

Example Embodiment

[0021] Embodiment 3: This embodiment provides a method for controlling uniform heat generation of a switching power supply switch tube. The switching power supply includes a full-bridge converter. The structure of the full-bridge converter is as follows figure 1 As shown, the four switching devices Q1 (first switching device), Q2 (second switching device), Q3 (third switching device), and Q4 (fourth switching device) in the full-bridge converter are all switching devices. In the full-bridge converter, the switching device as the leading arm and the switching device as the lagging arm alternate in cycles, and the alternating period Tp is 6 times the switching control period Ts of each switching element; that is, one alternating period Tp contains 6 switching control periods Ts. For example, in the first three switching control periods Ts in an alternating period Tp, Q1 and Q2 constitute a lagging arm, and Q3 and Q4 constitute a leading arm, then in the same alternate period Tp, the latter In the three switch control periods Ts, Q1 and Q2 constitute a leading arm, and Q3 and Q4 constitute a lagging arm.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Similar technology patents

Radiant Panel Burner

InactiveUS20170067633A1Uniform heatingReduces accumulationGaseous fuel burnerMajor and minorMesh grid
Owner:COWAN ROBERT L

Preparing method for ultra-thin galvanized plate

InactiveCN109023200AGuaranteed annealing effect and flatnessUniform heatingHot-dipping/immersion processesControl modePull force
Owner:山东省博兴县云光钢铁有限公司

Classification and recommendation of technical efficacy words

  • Uniform heating
  • Extend your life
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products