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
CN110149044AActive Publication Date: 2019-08-20SUNGROW POWER SUPPLY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SUNGROW POWER SUPPLY CO LTD
Publication Date
2019-08-20

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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.
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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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