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Cycle-by-cycle current-limiting protection method for VIENNA rectifier and device thereof

A wave-by-wave current limiting and rectifier technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of power switch tube damage, complex control method, and influence on input side grid current distortion Performance indicators and other issues, to achieve the effect of continuous change of input current and improve reliability

Active Publication Date: 2010-12-01
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This scheme is effective for short-circuit conditions, but it cannot protect against the continuous increase of load current, because the hiccup protection is intermittent for a long time, and it takes milliseconds to release the blocking drive. This protection control method Can not achieve the effect of continuous change of current
Moreover, in the gap of high current, the power switch tube will be continuously impacted to cause damage, and it will also affect the current distortion performance index of the input side power grid
[0005] The third existing technical solution: applied to the wave-by-wave current limiting control of the diode neutral point clamped multilevel converter, related to the topology of the neutral point clamped inverter, focusing on the delay control circuit, and the control method is complicated

Method used

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  • Cycle-by-cycle current-limiting protection method for VIENNA rectifier and device thereof
  • Cycle-by-cycle current-limiting protection method for VIENNA rectifier and device thereof
  • Cycle-by-cycle current-limiting protection method for VIENNA rectifier and device thereof

Examples

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Effect test

no. 1 example

[0041] In the first embodiment of the present invention, a VIENNA rectifier wave-by-wave current limiting protection device, the connection relationship with the existing main power circuit switch tube drive circuit is as follows figure 2 shown. This device includes: drive enabling unit, wave-by-wave current limiting unit and current limiting comparison unit, such as image 3 As shown, among them,

[0042] 1) The current limiting comparison unit is connected to the output of the current sampling unit, and is used to generate a wave-by-wave current limiting enable signal according to the three-phase input current collected by the current sampling unit and output it to the wave-by-wave current limiting unit;

[0043]The current-limiting comparison unit specifically includes three comparators, and the three-phase input voltages: Ia, Ib and Ic are respectively input to the negative input terminals of the three comparators, and the overcurrent protection threshold current is conn...

no. 2 example

[0055] The second embodiment of the present invention, a device for wave-by-wave current limiting protection of a VIENNA rectifier, is substantially the same as the first embodiment, the only difference being that the composition and connection mode of the drive enabling unit are different. In this embodiment, the drive enabling unit includes two cascaded OR gates, such as Image 6 As shown, the first drive control signal PWM1 and the second drive control signal PWM2 are input to the two input terminals of the first OR gate 1, and the two output terminals of the first OR gate 1 are combined into a channel connected to the second OR gate 2 One input terminal, the third drive control signal PWM3 is input to the other input terminal of the second OR gate 2, and finally the second OR gate 2 outputs the wave-by-wave driving enable signal clk to the wave-by-wave current limiting unit.

no. 3 example

[0056] The third embodiment of the present invention, this embodiment is a method of wave-by-wave current limiting protection for VIENNA rectifiers summarized on the basis of the first and second embodiments, specifically including:

[0057] When the three-phase input current of the main power circuit exceeds the overcurrent protection threshold current for a certain period of time within a switching cycle, the switching tube of the main power circuit is stopped from being driven. The certain period of time may be 9 to 15 nanoseconds.

[0058] When the three-phase input current of the main power circuit falls back to the overcurrent protection threshold current and below, and the switching tube driving control signal reaches stability within one switching cycle, the switching tube of the main power circuit is re-driven.

[0059] Such as Figure 4 As shown, the stability of the switch tube driving control signal within one switching cycle means that the duration between the fi...

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Abstract

The invention discloses a cycle-by-cycle current-limiting protection method for a VIENNA rectifier and a device thereof. The method comprises the following steps: when three-phase input current of a main power circuit exceeds overcurrent protection threshold current and reaches certain time in a switching cycle, stopping driving a switching tube of the main power circuit; and when the three-phase input current of the main power circuit returns to and below the overcurrent protection threshold current and a driving control signal of the switching tube reaches a stable status in the switching cycle, re-driving the switching tube of the main power circuit. In the invention, the driving signal of the switching tube is adjusted by the three-phase input current in a pulse cycle to effectively protect the switching tube in the main power circuit against overcurrent damage and achieve the effect of continuous change of the input current. In the case of short circuit in the main power circuit owing to faults, the invention can make response in the switching cycle and ensure that single pulse short-circuit current is kept within the allowable range, thus having a short-circuit protection function and improving reliability of a switching power supply and a power device.

Description

technical field [0001] The invention relates to the technical field of switching power supply current protection, in particular to a method and device for wave-by-wave current limiting protection of a VIENNA rectifier. Background technique [0002] Since the PWM (Pulse Width Modulation, pulse width modulation) control technology was introduced into the field of switching power supplies, the dynamic and static performance of the grid-side current has been improved due to the direct current control technology, and the grid-side current control is not sensitive to system parameters, and the current control is enhanced. System robustness has received extensive attention. With the development of digital switching power supply technology, the requirements for product performance and reliability are getting higher and higher, and the existing current protection methods and their respective shortcomings are as follows: [0003] One of the existing technical solutions: through curre...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M7/217
CPCH02M7/219H02M1/32
Inventor 魏滢刘辉
Owner ZTE CORP
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