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Dynamic switching control device for uninterruptible power supply system to add impulsive load suddenly

A shock load, power system technology, applied in circuit devices, emergency power arrangements, electrical components, etc., can solve problems such as increasing product costs, reducing product market competitiveness, and solving output voltage sags or voltage interruptions. Effect

Inactive Publication Date: 2010-04-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the method of increasing the UPS capacity to deal with the impact load will inevitably increase the product cost and reduce the market competitiveness of the product

Method used

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  • Dynamic switching control device for uninterruptible power supply system to add impulsive load suddenly
  • Dynamic switching control device for uninterruptible power supply system to add impulsive load suddenly
  • Dynamic switching control device for uninterruptible power supply system to add impulsive load suddenly

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Embodiment Construction

[0010] refer to figure 1 , the uninterruptible power supply system of the present invention adds the dynamic switching control device of impact load suddenly, comprises main circuit and control circuit, and main circuit comprises input switch 2, power factor correction circuit 3, inverter 4, bypass thyristor 5 , LC filter 6, inverter output contactor 7 and output switch 8, one end of input switch 2 is connected to mains power supply 1, and the other end is connected to power factor correction circuit 3, inverter 4, LC filter 6, inverter One end of the output contactor 7 and the output switch 8, the other end of the output switch 8 is connected to the load 9, and the bypass thyristor 5 is connected across the connection end of the input switch 2 and the power factor correction circuit 3 and the output switch 8 and the inverter output Between the connection ends of the contactor 7, the control circuit includes a Hall current sensor 10, a current filter 11, a current sampling cir...

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Abstract

The invention discloses a dynamic switching control device for an uninterruptible power supply system to add an impulsive load suddenly, which comprises a main circuit and a control circuit. The control circuit comprises a Hall current sensor, a current filter, a current sampling circuit, a contact detection unit, a contractor coil drive unit, a subtractor, a comparer, a switching order controller, a PWM drive circuit and a by-pass thyristor drive circuit. When current acquisition values are continuously larger than a given reference value for three times within three on-off cycles, the switching order controller sends out a signal to switch on a by-pass thyristor and sends out another signal to switch off a contactor coil at the same time, thereby realizing the simultaneous power supply of a bypass and an inverter circuit of the main circuit. When the contact detection unit detects that a contact of the contactor is switched off, the switching order controller sends out a signal to block a PWM pulse, thereby realizing the independent power supply of the bypass of the main circuit. The invention can realize instant and quick switching when the uninterruptible power supply system adds the impulsive load suddenly without increasing the equipment cost, and can effectively solve the voltage sag and interruption of output voltages.

Description

technical field [0001] The invention relates to a dynamic switch control device for a sudden impact load in a power supply system, in particular to a dynamic switch control device for a sudden impact load in an uninterruptible power supply system. Background technique [0002] Uninterruptible power supply (UPS) is more and more widely used in the power supply and power failure protection of various important loads. With the continuous improvement of users' requirements for power supply reliability, the sudden addition of RCD (rectifier) ​​loads and motors to the UPS system The instantaneous power quality under impact loads such as (inductive) loads puts forward strict requirements. [0003] Ensuring that the UPS system still outputs a standard sinusoidal voltage at the moment of sudden impact load is not only the actual demand of power consumers, but also a difficult problem that UPS power supply design engineers must solve. [0004] According to UPS design criteria, the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06
Inventor 何国锋徐德鸿于玮
Owner ZHEJIANG UNIV
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