Soft start circuit and soft start method of voltage source type inverter

A soft-start circuit and voltage source technology, which is applied to electrical components, output power conversion devices, and AC power input to DC power output. Capacitor voltage, soft-start switch closing large impact current and other issues, to avoid instantaneous large impact current and strong adaptability

Pending Publication Date: 2020-04-07
湖南时铭电气有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] The invention provides a soft-start circuit and a soft-start method for a voltage source inverter, which are used to solve the problem of the instantaneous large inrush current when the soft-start switch is closed, and to slowly increase the energy storage by using a thyristor controllable rectification method. The voltage in the capacitor requires a phase sequence detection circuit, a technical problem that requires high quality grid voltage

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  • Soft start circuit and soft start method of voltage source type inverter
  • Soft start circuit and soft start method of voltage source type inverter
  • Soft start circuit and soft start method of voltage source type inverter

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Embodiment Construction

[0031] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but the present invention can be implemented in a variety of different ways defined and covered by the claims. The technical features in the following embodiments can be combined with each other. The embodiments are only examples and not intended as Restrictions on reasonable combinations of technical features.

[0032] see Figure 4 , the soft-start circuit of the voltage source inverter of the present invention comprises a three-phase full-bridge thyristor rectifier connected to the three-phase main power supply respectively, and an energy storage electrolytic capacitor connected to the output end of the three-phase full-bridge thyristor rectifier, and also includes A soft-start AC contactor connected to two of the three phases, a transformer rectifier circuit connected in series with the soft-start AC contactor and connected in parallel with an en...

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Abstract

The invention discloses a soft start circuit and a soft start method of a voltage source type inverter. The circuit comprises a three-phase full-bridge thyristor rectifier connected with a three-phasemain power supply, an energy storage electrolytic capacitor which is connected with the output end of the three-phase full-bridge thyristor rectifier, a soft start alternating current contactor whichis connected to any two phases of the three phases, a voltage transformation rectifying circuit which is connected with the soft start alternating current contactors in series and connected with theenergy storage electrolytic capacitor in parallel, and a digital control unit which is used for driving the three-phase full-bridge thyristor rectifier and controlling the soft start alternating current contactors to be opened and closed. According to the invention, the circuit has the advantages of no impact current, strong adaptability to the power grid, small harmonic content in the soft startperiod, high power factor and the like.

Description

technical field [0001] The invention relates to the technical field of inverters, in particular to a soft-start circuit and a soft-start method for a voltage source inverter. Background technique [0002] Because the energy storage density of capacitors is much greater than that of inductors, the volume and weight of voltage source inverters with the same capacity are smaller than those of current source inverters; and current source inverters require more power than voltage source inverters. A large number of power devices can meet the requirements by using fully-controlled devices (such as IGBTs, MOSFETs) in series with diodes, and the diodes have a large on-state voltage drop; therefore, voltage source inverters are more widely used than current source inverters. . [0003] In the current prior art, there are generally two types of soft-start circuits and soft-start methods for voltage source inverters: [0004] figure 1 and figure 2 As the first technical solution, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M7/517H02M7/521H02M1/12
CPCH02M1/36H02M7/517H02M7/521H02M1/12H02M1/0012
Inventor 肖牧轩汪亮
Owner 湖南时铭电气有限公司
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