Auxiliary power supply system for power converter and method

A technology for power converters and power supply systems, applied in current collectors, battery circuit devices, electric vehicles, etc., can solve the problems of high cost, low reliability and utilization rate, and achieve improved reliability and utilization rate, space and cost advantages, improved reliability, and the effect of utilization

Inactive Publication Date: 2012-08-08
SHENZHEN HOPEWIND ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an auxiliary power supply system of power converter and method

Method used

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  • Auxiliary power supply system for power converter and method
  • Auxiliary power supply system for power converter and method
  • Auxiliary power supply system for power converter and method

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Embodiment Construction

[0050] 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 in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0051] figure 2 A schematic circuit structure diagram of an auxiliary power supply system of a power converter according to an embodiment of the present invention is shown, and the power converter may be a wind power generation converter or a solar power generation inverter. Such as figure 2 As shown, the auxiliary power supply system of the power converter includes a grid 10 , a grid-side converter 20 and a DC bus capacitor 30 . Wherein, the input end of the grid-side converter 20 is connected to the grid 10 , so as to convert the three-phase AC input from the grid 10 into DC power, and perfor...

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Abstract

The invention discloses an auxiliary power supply system for a control board, a switch and a contactor of a power converter and a corresponding method. The method comprises the following steps: step S110, when a power grid normally works, a grid side converter gets electricity from the power grid and converts the electricity into direct current for output to charge a direct current bus capacitor; S120, a DC / DC converter gets electricity from a direct current bus at the output end of the grid side converter and converts the electricity into stabilized voltage to supply the power for at least one of the control board, the switch controlled by a direct current coil and the contactor controlled by the direct current coil; and S130, when the power grid is disconnected, the direct current bus capacitor discharges the DC / DC converter, so that the DC / DC converter continuously supplies the power. By adopting the power converter used by the auxiliary power supply system and the method, the control board, the switch and the contactor of the system can be ensured to be supplied without a UPS (Uninterrupted Power Supply) or an external power supply under the situation of voltage drop of the power grid to prevent the system from power failure; and meanwhile, the UPS is omitted, the cost is reduced, and the reliability and the utilization rate of a complete machine are improved.

Description

technical field [0001] The invention relates to a power converter, in particular to an auxiliary power supply system and method for the power converter. Background technique [0002] UPS (Uninterruptible Power Supply) is a voltage-stabilized and frequency-stabilized AC power supply that contains an energy storage device, with rectifiers and inverters as its main components. It mainly uses energy storage devices such as batteries to provide uninterrupted power supply to computers, servers, storage devices, communication network systems or industrial control systems during power outages. When the mains input is normal, the UPS supplies the mains power to the load after the mains voltage and frequency are stabilized; when the mains is interrupted (such as an accidental blackout), the UPS immediately transfers the electric energy of the energy storage device (such as a battery pack) to the load through the inverter. The method continues to supply AC power to the load, so that t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/34H02J3/32
Inventor 曾建友
Owner SHENZHEN HOPEWIND ELECTRIC CO LTD
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