Switching power source, and voltage output method

A technology of switching power supply and output terminal, applied in the field of electric power, can solve the problems of BUS voltage can not be discharged, BUS voltage is not balanced, the auxiliary power supply is difficult to obtain power and other problems, so as to avoid potential safety hazards and improve the effect of safety environment.

Active Publication Date: 2019-07-05
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The single-phase AC input voltage adopts a multi-unit series PFC circuit and the three-phase AC input voltage adopts a three-phase rectifier composed of single-phase modules, all have a common feature, that is, the PFC circuit has multiple output BUS voltages, and these BUS There is no interconnection between the voltages, which makes it difficult for the auxiliary power supply to take power
Using different auxiliary power supply design circuit methods may cause the BUS voltage to be unable to release or the BUS voltage to be uneven.
[0007] For the above-mentioned problems existing in related technologies, no effective solution has been found yet

Method used

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  • Switching power source, and voltage output method
  • Switching power source, and voltage output method
  • Switching power source, and voltage output method

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Embodiment 1

[0031] The switching power supply of the embodiment of the present application can operate in the scene of weak or strong electricity. The switching power supply can input the mains and output the direct current for household or industrial use, and can also be applied in the scene of AC-DC conversion (AC-DC conversion) .

[0032] In this embodiment, a switching power supply is provided, figure 1 is a circuit structure diagram of a switching power supply according to an embodiment of the present invention, such as figure 1 shown, including:

[0033] A multi-unit series PFC circuit 10, the output end of the PFC circuit is connected to N buses (BUS), and an output filter capacitor is connected between two lines in each bus, where N is an integer greater than 1;

[0034] DC isolation unit 12, the input end of the DC isolation unit is connected to the N-way bus, a pair of output terminals of the DC isolation unit are respectively connected to a pair of input ends of the auxiliary...

Embodiment 2

[0054] In this embodiment, a voltage output method is provided, figure 2 is a flowchart of a voltage output method according to an embodiment of the present invention, such as figure 2 shown, including:

[0055] S202, outputting N bus voltages through N output filter capacitors;

[0056] S204. After isolating the direct current of the N bus voltages, output the N bus voltages to the auxiliary power supply through the input filter capacitor.

[0057] Optionally, outputting N bus voltages through N output filter capacitors includes one of the following: a single-phase input AC voltage PFC circuit outputs N bus voltages through N output filter capacitors; a three-phase input AC voltage PFC circuit outputs N bus voltages through N output The filter capacitor outputs N bus voltages.

[0058] In this embodiment, another voltage output method is provided, including: S302, receiving an AC signal; S304, inputting the AC signal into any switching power supply in Embodiment 1; and S...

Embodiment 3

[0061] In this embodiment, the PFC circuit with multiple output BUS voltages is a PFC circuit with single-phase input AC voltage, and the PFC circuit is a single-phase input AC voltage PFC circuit.

[0062] image 3 A schematic structural diagram of a multi-unit series PFC circuit with single-phase AC input for the auxiliary power supply method provided by the present invention. This embodiment consists of a single-phase input AC voltage AC, an input inductance L, N AC-DC power converters, It is composed of N AC-DC output power supply filter capacitors, 2N switch tubes, auxiliary power supply circuit and auxiliary power supply input filter capacitor. Among them, AC-DC can be regarded as a two-port network, the input is connected in series, and then the output is respectively connected to the respective filter capacitors.

[0063] One end of the single-phase input AC voltage AC is connected in series with one end of the boost inductor L, one end of the first AC-DC converter is...

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Abstract

The present invention provides a switching power source and a voltage output method. The switching power source comprises: a multi-unit series PFC circuit, wherein the output end of the PFC circuit isconnected with N buses, and an output filter capacitor is connected between each two lines in each bus, wherein N is an integer being larger than 1; a direct current isolation unit, wherein the inputend of the direct current isolation unit is connected with the N buses, one pair of output ends of the direct current isolation unit are respectively connected with a pair of input ends of a secondary power source, and the direct current isolation unit is configured to isolate from the direct current on the input ends of the direct current isolation unit; and the secondary power source, wherein apair of input ends of the secondary power source are respectively connected with a pair of output ends of the direct current isolation unit, and an input filter capacitor is connected between the pair input ends. According to the invention, the technical problem is solved that each output BUS voltage is mutually influenced in the switching power source and the system has potential safety hazardsat outage in the prior art.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a switching power supply and a voltage output method. Background technique [0002] With the popularity of cloud computing and big data, the demand for communication power has increased greatly, and higher requirements have been put forward for the reliability, power capacity and performance indicators of communication power supplies. High efficiency and high power density are inevitable for the development of communication power supplies trend. [0003] For single-phase AC input, multi-unit series PFC (Power factor correction) has outstanding advantages in improving conversion efficiency and power density. [0004] For three-phase AC input, the commonly used PFC circuit (also called PFC topology) is a Vienna rectifier and a three-phase six-switch rectifier bridge. The Vienna rectifier is a three-level circuit with high efficiency and is the mainstream solution for high-power thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M7/10H02M7/25
CPCH02M1/4216H02M1/4233H02M1/4258H02M7/10H02M7/25H02M1/0074Y02B70/10
Inventor 林国仙范杰周建平陈建龙樊珊珊董秀锋
Owner ZTE CORP
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