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Two-stage converter, starting method thereof, LLC converter and application system

A converter and start-up voltage technology, applied in control/regulation systems, converting AC power input to DC power output, and converting DC power input to DC power output, etc., can solve problems such as high cost and large system volume

Active Publication Date: 2019-08-20
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a two-stage converter and its start-up method, LLC converter and application system to solve the system problems caused by the need to add switches and slow-start resistors to charge the DC bus of the H-bridge converter in the prior art Problems with bulk and cost

Method used

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  • Two-stage converter, starting method thereof, LLC converter and application system
  • Two-stage converter, starting method thereof, LLC converter and application system
  • Two-stage converter, starting method thereof, LLC converter and application system

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Embodiment Construction

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

[0048] When the system of the two-stage converter starts to start, the rear-stage converter (such as figure 2 with image 3The DC bus at the input end of the H-bridge converter in the H-bridge converter) has no voltage or cannot reach the startup voltage of its auxiliary power supply, so the controller of the post-stage converter cannot work normally, and the post-stage converter cannot sample and compare its DC bus voltage. The communication transmission prevents the controller of the LL...

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Abstract

The invention provides a two-stage converter, a starting method thereof, an LLC converter and an application system. The method comprises the following steps: controlling a main circuit of a controller of the LLC converter in the two-stage converter to carry out hiccup charging on a DC bus of a post-stage converter according to a preset period, so that the voltage of the DC bus of a post-stage converter is gradually increased until an auxiliary power supply of the post-stage converter starts to work, and then supplying power to the controller of the post-stage converter; after the controller of the post-stage converter outputs the detected DC bus voltage, enabling the controller of the LLC converter to judge whether the output voltage of the LLC converter rises to a hiccup starting voltageor not; and if yes, enabling the controller of the LLC converter to control the main circuit of the LLC converter to enter a hiccup voltage stabilizing stage, so that the LLC converter is used for replacing a switch and a slow-up resistor which are added in the prior art to provide stable direct-current bus voltage for a post-stage converter, and the problems of large system size and high cost inthe prior art are avoided.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a two-stage converter and its starting method, an LLC converter and an application system. Background technique [0002] A two-stage converter with LLC topology can realize the isolation and transformation of electric energy; for example figure 1 In the three-phase cascaded modular photovoltaic solid-state transformer shown, each module in each phase includes an isolated DCDC converter and an H-bridge converter; when the isolated DCDC converter uses an LLC converter, a The module is a two-stage converter with LLC topology; the structure of the two-stage converter with LLC topology can be as follows figure 2 shown in the two-level topology, it can also be as image 3 The three-level topology shown. [0003] figure 1 In the system shown, the isolation is realized by the high-frequency transformer of the pre-stage LLC converter in each module, and by configuring a cer...

Claims

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Application Information

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IPC IPC(8): H02M1/36H02M3/335
CPCH02M1/36H02M3/33553H02M1/007H02M3/01H02M3/33573H02M3/335H02M7/4807Y02B70/10Y02E10/56H02M1/0006H02M7/4815H02J2300/24H02J3/381H02M1/08H02M7/5387
Inventor 赵涛庄富帅王新宇庄加才王明达庄园
Owner SUNGROW POWER SUPPLY CO LTD
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