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Method and system for controlling backflow current to generate power tube voltage stress

A technology of backflow current and voltage stress, applied in the direction of output power conversion device, conversion equipment with intermediate conversion to AC, electrical components, etc., can solve problems affecting system reliability, power tube avalanche breakdown, damage, etc., to achieve The effect of ensuring reliability, relieving release strength, and avoiding damage

Active Publication Date: 2018-07-06
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a method and system for controlling the voltage stress of the power tube generated by the backflow current, so as to at least solve the problem in the related art that when the backflow current is generated at the output terminal of the secondary side of the DC-DC power supply, the huge energy brought by the backflow current will affect the power Extremely high voltage peak stress is generated on the tube, which leads to avalanche breakdown and damage of the power tube, which seriously affects the reliability of the system.

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  • Method and system for controlling backflow current to generate power tube voltage stress
  • Method and system for controlling backflow current to generate power tube voltage stress
  • Method and system for controlling backflow current to generate power tube voltage stress

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Embodiment Construction

[0032] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0033] Based on the related art, when the output terminal of the secondary side of the DC-DC power supply generates a backflow current, the huge energy brought by the backflow current will generate extremely high voltage peak stress on the power tube, resulting in avalanche breakdown of the power tube and damage, seriously affecting For the reliability of the system, this embodiment provides a system for controlling the backflow current to generate the voltage stress of the power tube. The structural block diagram of the system is as follows figure 2 shown, including:

[0034] The backfeed threshold detection device 10 is arranged on the secondary side of the DC-DC circuit, and is used to generate ...

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Abstract

The invention discloses a method and a system for controlling the backflow current to generate power tube voltage stress, wherein the system includes: a backflow threshold detection device, which is arranged on the secondary side of a DC-DC power supply, and is used for when the backflow current exceeds a preset current threshold Under the situation that produces the first driving signal to control the backflow control driving device; the backflow control driving device is used to control the first power tube and the second power tube are not in the open or closed state at the same time to control the power tube voltage generated by the backflow current The magnitude of the stress. By using the present invention, it is solved that when the system generates backflow current, the huge energy brought by the backflow current will generate extremely high voltage peak stress on the closed power tube, resulting in avalanche breakdown and damage of the power tube, which seriously affects the reliability of the system sex issue. By making the first power tube and the second power tube alternately on or off, damage to the power tube is avoided and system reliability is ensured.

Description

technical field [0001] The invention relates to the fields of communication and power electronics, in particular, to a method and system for controlling backflow current to generate power tube voltage stress. Background technique [0002] figure 1 The one shown is a DC-DC (Direct Current-Direct Current, referred to as DC-DC) power supply, where the left side of the diagram is the primary side input terminal of the power supply, and the right side of the diagram is the secondary side output terminal of the power supply . When the input voltage drops rapidly, the energy at the output terminal of the secondary side will be poured back into the primary side. Due to the voltage drop, the driver of the control chip is turned off, the synchronous rectifier tube of the secondary side is not turned on, and the freewheeling path of the inductor current disappears. Since the inductor current cannot change suddenly, the energy stored in the inductor and the energy stored in the output...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M1/32
Inventor 王一丁欧阳艳红
Owner ZTE CORP