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Method of mitigating the effects of ac input voltage surges in transformerless rectifier ups systems

A technology of input voltage and voltage surge, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, converting AC power input to AC power output, and converting AC power input to DC power output, etc., can solve damage UPS system and other problems

Active Publication Date: 2021-08-10
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This surge pumps the DC voltage on the DC bus of the UPS system to a much higher level than the normal DC voltage of the DC bus through the anti-parallel diode of the rectifier (eg, the anti-parallel diode of the IGBT switching device 146), which may Can damage other components of the UPS system connected to the DC bus

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  • Method of mitigating the effects of ac input voltage surges in transformerless rectifier ups systems
  • Method of mitigating the effects of ac input voltage surges in transformerless rectifier ups systems
  • Method of mitigating the effects of ac input voltage surges in transformerless rectifier ups systems

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Embodiment Construction

[0019] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0020] According to one aspect of the present disclosure, a transformerless UPS system is controlled to mitigate AC input voltage surges. Although refer to figure 1 The illustrated prior art UPS system 100 describes this control, but it should be understood that this control is not in the prior art.

[0021] When the AC power source 132 fails, the circuit breaker 101 remains closed and the rectifier 108 will open. Large AC input voltage surges at the input 130 of the rectifier 108 sometimes occur when the AC power source 132 is restored to operation or the backup generator is running. The large voltage surge passes through the IGBT146( figure 2) pumps the voltage level of the DC bus 110 to a level much higher than the nominal operating voltage of the DC bus 110, which can cause damage to other devices connected to the DC bus 110.

[0022] It should be understood that...

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Abstract

A method of mitigating the effects of surges in AC input voltage on a UPS is disclosed. Reduces the impact of surges in the AC input voltage on the UPS. If the AC input voltage is overvoltage, the rectifier will be operated using the DC bus target voltage as the DC bus voltage unless the rectifier reaches its current limit. If the rectifier reaches its current limit, the DC bus target voltage is increased by a predetermined amount, which is used as the current DC bus target voltage, unless the increased DC bus target voltage exceeds the maximum DC bus voltage limit, in which case the current DC bus voltage The bus target voltage is set to the maximum DC bus voltage limit. The rectifier is then operated using the current DC bus target voltage until its current limit is reached or the AC input voltage surge has passed. If the rectifier reaches its current limit again, the above steps starting with increasing the DC bus target voltage are repeated.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Patent Application Serial No. 62 / 461,914, filed February 22, 2017. The entire disclosure of the above application is incorporated herein by reference. technical field [0003] The present disclosure relates to mitigating the effects of AC input voltage surges in UPS systems with transformerless rectifiers. Background technique [0004] This section provides background information related to the present disclosure which is not necessarily prior art. [0005] One common type of uninterruptible power supply (UPS) system is the double conversion UPS system, which has a rectifier that converts AC input power to DC power that is supplied via a DC bus to an inverter that converts the DC power back to AC power . A circuit breaker is coupled between the AC power input and the input of the rectifier. The AC power input is coupled to a source of AC power, such as a power feed from a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M5/458H02J9/06
CPCH02J9/062H02M1/32H02M5/4585H02M1/0038H02M7/125H02M7/487H02H9/045H02J9/061
Inventor 布莱恩·P·希伯陈羡
Owner VERTIV CORP