US 11,637,431 B2Granted

Inverter

AssigneeHuawei Digital Power Technologies Co., Ltd.

InventorsYanzhong Zhang, Xun Wang

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Abstract

An inverter includes a direct-current conversion unit, a busbar unit, and an inversion unit. The direct-current conversion unit includes a first positive input terminal, a first negative input terminal, a second positive input terminal, a second negative input terminal, a first direct current DC-to-DC module, a second DC-to-DC module, a first on/off control device, a second on/off control device, a first switch, and a second switch. The first positive input terminal and the first negative input terminal are configured to connect a first photovoltaic string, the second positive input terminal and the second negative input terminal are configured to connect a second photovoltaic string, and a connection relationship of a circuit in the direct-current conversion unit can be changed based on combinations of turning-on or turning-off of the first switch and the second switch.

Claims19

Dependent claims

An inverter, comprising:

a busbar unit;
an inversion unit having an input terminal connected to the busbar unit, wherein the inversion unit is configured to convert a direct-current (DC) voltage between a positive electrode and a negative electrode of the busbar unit into an alternating current (AC) voltage;
a DC conversion unit having a first positive input terminal, a first negative input terminal, a second positive input terminal, a second negative input terminal, a first DC-to-DC module, a second DC-to-DC module, a first on/off control device, a second on/off control device, a first switch, and a second switch, wherein
the first positive input terminal is connected to a first terminal of the first DC-to-DC module and one terminal of the first on/off control device, the first negative input terminal is connected to a second terminal of the first DC-to-DC module and the negative electrode of the busbar unit through the first switch, the first negative input terminal is connected to the second positive input terminal through the second switch, and a third terminal of the first DC-to-DC module is connected to another terminal of the first on/off control device and the positive electrode of the busbar unit;
the second positive input terminal is connected to a first terminal of the second DC-to-DC module and one terminal of the second on/off control device, the second negative input terminal is connected to a second terminal of the second DC-to-DC module and the negative electrode of the busbar unit, and a third terminal of the second DC-to-DC module is connected to another terminal of the second on/off control device and the positive electrode of the busbar unit;
and
a controller configured to perform detection on an operating state of the inversion unit, and, when the inversion unit is in the operating state, perform detection on output voltage of a first photovoltaic string and output voltage of a second photovoltaic string, and when detecting that the inversion unit is not operating, control the second switch to be turned off.

4 more elements

An inverter, comprising:

a busbar unit;
an inversion unit having an input terminal connected to the busbar unit, wherein the inversion unit is configured to convert direct-current (DC) voltage between a positive electrode and a negative electrode of the busbar unit into an alternating current (AC) voltage;
and
a DC conversion unit having a first positive input terminal, a first negative input terminal, a second positive input terminal, a second negative input terminal, a first direct current DC-to-DC module, a second DC-to-DC module, a first on/off control device, a second on/off control device, a first switch, and a second switch, wherein
the first negative input terminal is connected to a first terminal of the first DC-to-DC module and one terminal of the first on/off control device, the first negative input terminal is further connected to the second positive input terminal through the second switch, an other end of the first positive input terminal is connected to a second terminal of the first DC-to-DC module and the positive electrode of the busbar unit, and a third terminal of the first DC-to-DC module is connected to the negative electrode of the busbar unit and another terminal of the first on/off control device;
the second negative input terminal is connected to a first terminal of the second DC-to-DC module and one terminal of the second on/off control device, the second positive input terminal is connected to a second terminal of the second DC-to-DC module and the positive electrode of the busbar unit through the first switch, and a third terminal of the second DC-to-DC module is connected to a negative electrode of the busbar unit and another terminal of the second on/off control device.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/360,245Filed 28 Jun 2021 · continuation
Priority: 29 Dec 2018
Published: US 2021/0328435 A121 Oct 2021
Granted: 25 Apr 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H02J 3/381
Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised…
H02M 7/5387
Using semiconductor devices only, e.g. single switched pulse inverters: in a bridge configuration
H02M 3/156
Using semiconductor devices only: with automatic control of output voltage or current, e.g. switching regulators
H02M 7/48
By static converters: using discharge tubes with control electrode or semiconductor devices with control electrode