Busbar voltage soft starting method of uninterruptible power supply
A bus voltage and soft start technology, which is applied in the direction of electrical components and output power conversion devices, can solve the problems of bus voltage soft start that cannot be uninterrupted power supply, power factor correction circuit use restrictions, etc., to save components and reduce cost effect
Inactive Publication Date: 2015-05-27
EATON MFG LP GLASGOW SUCCURSALE DE MOR
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Problems solved by technology
[0005] At present, the power factor correction circuit commonly used in uninterruptible power supply and figure 1 The power factor correction circuit in is similar, the difference is that two diodes are used to replace figure 1 In the thyristor X1 and thyristor X2, but the power factor correction circuit can not soft-start the bus voltage of the uninterruptible power supply, so that the use of the power factor correction circuit is limited
In this case, only the current limiting resistor plus relay combination soft start or DC source discharge soft start method can be adopted.
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[0063] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0064] figure 2 It is a circuit diagram for realizing the bus voltage soft start method of the uninterruptible power supply of the present invention. The bus voltage soft start method of the uninterruptible power supply of the present invention is based on figure 1 A part of the circuit shown in the uninterruptible power supply is realized. Including positive bus 1, negative bus 2, capacitor C1, capacitor C2, I-type three-level inverter 4, inductor L, filter capacitor C, inverter bidirectional switch S1, bypass bidirectional switch S2, inverter relay R1 and output relay R2. One end of the capacitor C1 is connected to the positive bus 1, and the other end is grounded; one end of the capacitor C2 is grounded, and the other end is con...
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The invention provides a busbar voltage soft starting method of an uninterruptible power supply. The uninterruptible power supply comprises a bypass bilateral switching tube and an inverted bilateral switching tube. The busbar voltage soft starting method comprises the following steps: when the uninterruptible power supply is free of bypass output, in a positive half cycle of the bypass alternating current power supply, gradually reducing the conduction angle of the bypass bilateral switching tube from 180 degrees to 90 degrees; in a negative half cycle of the bypass alternating current power supply, gradually reducing the conduction angle of the bypass bilateral switching tube from 360 degrees to 270 degrees; when the uninterruptible power supply has bypass output, in the positive half cycle of the bypass alternating current power supply, gradually reducing the conduction angle of the inverted bilateral switching tube from 180 degrees to 90 degrees; in a negative half cycle of the bypass alternating current power supply, gradually reducing the conduction angle of the inverted bilateral switching tube from 360 degrees to 270 degrees. According to the busbar voltage soft starting method disclosed by the invention, the inverted bilateral switching tube and the bypass bilateral switching tube are utilized to realize busbar voltage soft starting of the uninterruptible power supply.
Description
technical field [0001] The invention relates to an uninterruptible power supply, in particular to a bus voltage soft start method of the uninterruptible power supply. Background technique [0002] At present, with the continuous advancement of the research and development technology of electrical equipment, the requirements for power supply quality are getting higher and higher. Since the uninterruptible power supply device can continuously supply power to electrical equipment, it can provide electrical equipment with a safe, stable and The protection of continuous power supply has a wide range of uses and has become a hot research topic. [0003] When the uninterruptible power supply starts to work, in order to prevent damage to the circuit caused by excessive inrush current, it is necessary to soft-start the bus voltage in the uninterruptible power supply, that is, to slowly charge the capacitor on the bus. [0004] figure 1 It is a circuit diagram of an uninterruptible ...
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Login to View More IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 王永祥
Owner EATON MFG LP GLASGOW SUCCURSALE DE MOR