CN111082425A - A kind of low-loss fast switching power supply and switching method thereof - Google Patents
A kind of low-loss fast switching power supply and switching method thereof Download PDFInfo
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- CN111082425A CN111082425A CN202010073527.2A CN202010073527A CN111082425A CN 111082425 A CN111082425 A CN 111082425A CN 202010073527 A CN202010073527 A CN 202010073527A CN 111082425 A CN111082425 A CN 111082425A
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Abstract
The invention discloses a low-loss quick switching power supply device, which is used for connecting an alternating current power supply to a load and ensuring the uninterrupted power supply of the load. When the converter normally operates, one of the quick mechanical switches is switched on, the converter is in hot standby, and an alternating current power supply directly connected with the quick mechanical switch in the switching-on state supplies power to a load; when an alternating current power supply directly connected with the rapid mechanical switch in the closing state breaks down, the rapid mechanical switch is opened, the converter is unlocked and sends reverse current to force the fault current flowing through the rapid mechanical switch to pass through zero and extinguish arc, so that physical isolation between a load and a fault alternating current power grid is completed, and then other alternating current power supplies or direct current power supplies supply power to the load through the converter.
Description
Technical Field
The invention relates to the field of power supplies, in particular to a low-loss fast switching power supply and a switching method thereof, which are suitable for various application scenes requiring reliable power supply of an alternating current power grid.
Background
The published chinese invention patents CN110168852A (three-wire multi-phase UPS with bypass) and CN104917281B (an inverter and mains zero-switching circuit and method) are prior art of the present invention. The two uninterrupted power supplies in the prior art need to be connected with an anti-parallel thyristor in series between an alternating current power grid and a load, a converter is connected with the load in parallel, and the thyristor can shorten the switching time of a fault alternating current power grid and a standby power supply and ensure the continuous power supply of the load. However, compared with a mechanical switch, the uninterrupted power supply adopting the thyristor design has through-current loss and higher operation cost; the overcurrent capacity of the thyristor is low, so that the uninterrupted power supply designed based on the thyristor cannot be connected with an impact load; on the other hand, the conventional uninterruptible power supply can only solve the problem of uninterrupted power supply of loads in a single alternating current power grid, and cannot realize quick switching of the loads among a plurality of alternating current power grids.
That is, the application of the existing uninterruptible power supply has limitations: on one hand, the switching time cannot be ensured by adopting a mechanical switch design, and the through-flow loss and the impact load cannot be connected by adopting a thyristor design; on the other hand, the conventional uninterruptible power supply cannot realize the rapid switching of the load among a plurality of alternating current power grids.
Disclosure of Invention
The invention provides a low-loss fast switching power supply adopting a converter and a fast mechanical switch and a switching method thereof, which can effectively solve the technical problems that the uninterrupted power supply in the prior art cannot ensure the switching time by adopting the mechanical switch design, has through-flow loss and cannot be connected with an impact load by adopting the thyristor design, and cannot realize the fast switching of the load among a plurality of alternating current power grids.
The invention provides a low-loss fast switching power supply, which comprises a converter and a fast mechanical switch, wherein the converter is connected with a direct current power supply and a load, one end of the fast mechanical switch is connected with an alternating current power supply, and the other end of the fast mechanical switch is connected with the converter and the load.
Preferably, the dc power supply is replaced by another ac power supply.
The invention provides a switching method of a low-loss fast switching power supply, during normal operation, an alternating current power supply supplies power to a load through a fast mechanical switch, when the alternating current power supply fails, the fast mechanical switch is opened, the converter is unlocked, the physical isolation of the load and the alternating current power supply is completed by controlling the fault current which sends out reverse current and forces to flow through the fast mechanical switch to zero-cross arc extinguishing, and then the direct current power supply supplies power to the load through the converter.
The invention provides a low-loss fast switching power supply, which comprises a main converter, a first converter, a second converter, a first fast mechanical switch and a second fast mechanical switch, wherein one end of the main converter is connected with a load, the other end of the main converter is respectively connected with one ends of the first converter and the second converter, the other end of the first converter is connected with a first alternating current power supply, the other end of the second converter is connected with a second alternating current power supply, one end of the first fast mechanical switch is connected with the first alternating current power supply, the other end of the first fast mechanical switch is connected with the load and the second fast mechanical switch, one end of the second fast mechanical switch is connected with the second alternating current power supply, and the other end of the second fast mechanical switch is connected with the load and the first fast mechanical switch.
A fourth aspect of the present invention provides a switching method for a low-loss fast switching power supply, wherein in normal operation, a first ac power supply supplies power to a load via a first fast mechanical switch; when the first alternating current power supply fails, the second alternating current power supply supplies power to the load through the main converter and the second converter; after waiting a certain time and determining that the first AC power source is in permanent failure, the second AC power source supplies power to the load through the second fast mechanical switch.
Preferably, the first ac power source supplies power to the load through the first fast mechanical switch by that the first fast mechanical switch is in a closing state, the second fast mechanical switch is in a breaking state, and the main converter, the first converter and the second converter are in a hot standby state.
Preferably, the method for supplying power to the load by the second alternating current power supply through the main converter and the second converter comprises the steps of opening the first quick mechanical switch, unlocking the main converter and the second converter, and completing physical isolation of the load from the first alternating current power supply by controlling fault current which sends out reverse current and forces to flow through the first quick mechanical switch to be subjected to zero-crossing arc extinguishing.
Preferably, the second ac power source supplies power to the load through the second fast mechanical switch by closing the second fast mechanical switch, and locking the main converter, the first converter and the second converter.
Compared with the prior art, the invention has the advantages that the switching power supply adopting the converter and the quick mechanical switch overcomes the technical defects that the switching time cannot be ensured by adopting the mechanical switch design, the through-current loss exists and the impact load cannot be connected by adopting the thyristor design in the prior art, and simultaneously, the quick switching of the load among a plurality of alternating current power grids can be realized.
Drawings
Fig. 1 is a schematic diagram of a fast switching power UPS and its connections constructed in accordance with a preferred embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a fast switching power UPS and its connection constructed in accordance with a preferred embodiment 2 of the present invention.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present invention can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present invention.
Example 1:
fig. 1 is a schematic diagram showing a fast switching power UPS and its connection relationship constructed in accordance with a preferred embodiment 1 of the present invention. A low-loss fast switching power supply UPS comprises a converter VSC and a fast mechanical switch FSD1, wherein the converter VSC is connected with a direct current power supply DCS and a LOAD LOAD, one end of the fast mechanical switch FSD1 is connected with an alternating current power supply ACS1, and the other end of the fast mechanical switch FSD1 is connected with the converter VSC and the LOAD LOAD.
It is to be noted that, in the preferred embodiment 1, the direct-current power supply DCS may be replaced with another alternating-current power supply. In the art, converters are well known as electrical devices that change the voltage, frequency, number of phases and other quantities or characteristics of a power supply system, of the kind comprising rectifiers (AC to DC < AC/DC >), inverters (DC to AC < DC/AC >), AC converters (AC to AC >), DC converters (DC Chopper < DC Chopper >), etc., when an additional AC power source is used instead of a DC power source DCs, a corresponding kind of converter VSC can easily be used by the skilled person.
The switching method of the low-loss fast switching power supply UPS comprises the steps that when the UPS runs normally, the fast mechanical switch FSD1 is in a closing state, the converter VSC is in a hot standby state, and the AC power supply ACS1 supplies power to the LOAD LOAD through the fast mechanical switch FSD 1.
When the AC power supply ACS1 breaks down, the rapid mechanical switch FSD1 is opened, the converter VSC is unlocked, the reverse current is sent out through control and zero-crossing arc extinction of the fault current flowing through the rapid mechanical switch FSD1 is forced, physical isolation between the LOAD LOAD and the AC power supply ACS1 is completed, and then the DC power supply DCS supplies power to the LOAD LOAD through the converter VSC. It is to be noted that when the dc power source DCS is replaced by another ac power source, the LOAD is supplied by the other ac power source, which is finally replaced by the dc power source DCS, via the converter VSC.
Example 2:
fig. 2 is a schematic diagram showing a fast switching power UPS and its connection relationship constructed in accordance with a preferred embodiment 2 of the present invention. A low loss fast switching power supply UPS comprising a main converter VSC, a first converter VSC1, a second converter VSC2, a first fast mechanical switch FSD1 and a second fast mechanical switch FSD2, wherein the one end of main converter VSC is connected with LOAD LOAD, the other end of main converter VSC is connected with the one end of first converter VSC1 and second converter VSC2 respectively, the other end of first converter VSC1 is connected with first alternating current power ACS1, the other end of second converter VSC2 is connected with second alternating current power ACS2, the one end of first fast mechanical switch FSD1 is connected with first alternating current power ACS1, the other end of first fast mechanical switch FSD1 is connected with LOAD LOAD and second fast mechanical switch FSD2, the one end of second fast mechanical switch FSD2 is connected with second alternating current power ACS2, the other end of second fast mechanical switch FSD2 is connected with LOAD LOAD and first fast mechanical switch FSD 1.
The switching method of the low-loss fast switching power supply UPS comprises the steps that during normal operation, the first fast mechanical switch FSD1 is in a closing state, the second fast mechanical switch FSD2 is in a breaking state, the main converter VSC, the first converter VSC1 and the second converter VSC2 are in a hot standby state, and the first alternating current power supply ACS1 supplies power to the LOAD LOAD through the first fast mechanical switch FSD 1.
When the first ac power source ACS1 fails, the first fast mechanical switch FSD1 is tripped, the main converter VSC and the second converter VSC2 are unlocked, the physical isolation of the LOAD from the first ac power source ACS1 is completed by controlling zero-crossing arc quenching of the fault current that sends out the reverse current and forces to flow through the first fast mechanical switch FSD1, and then the second ac power source ACS2 supplies power to the LOAD via the main converter VSC and the second converter VSC 2. After waiting a certain time, after determining that the first ac source ACS1 is permanently faulted, the second fast mechanical switch FSD2 is switched on, locking the main converter VSC, the first converter VSC1 and the second converter VSC2, after which the second ac source ACS2 supplies the LOAD via the second fast mechanical switch FSD 2.
Compared with the prior art, the invention has the advantages that the switching power supply adopting the converter and the quick mechanical switch overcomes the technical defects that the switching time cannot be ensured by adopting the mechanical switch design, the through-current loss exists and the impact load cannot be connected by adopting the thyristor design in the prior art, and simultaneously, the quick switching of the load among a plurality of alternating current power grids can be realized.
Although the present invention has been described above with reference to specific embodiments, it will be appreciated by those skilled in the art that many modifications are possible in the arrangement and details of the invention disclosed within the principle and scope of the invention. The scope of the invention is to be determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.
Claims (8)
1. A low loss fast switching power supply (UPS) comprising a converter (VSC) and a fast mechanical switch (FSD 1); the method is characterized in that:
wherein converter (VSC) is connected with DC power supply (DCS) and LOAD (LOAD), the one end of quick mechanical switch (FSD1) is connected with alternating current power supply (ACS1), and the other end is connected with converter (VSC) and LOAD (LOAD).
2. A low loss fast switching power supply (UPS) according to claim 1, wherein:
the dc power supply (DCS) is replaced with another ac power supply.
3. A power switching method of a low loss fast switching power supply (UPS) according to claim 1, characterized in that:
during normal operation, an alternating current power supply (ACS1) supplies power to a LOAD (LOAD) through a fast mechanical switch (FSD1), when the alternating current power supply (ACS1) breaks down, the fast mechanical switch (FSD1) is opened, the converter (VSC) is unlocked, the LOAD (LOAD) is physically isolated from the alternating current power supply (ACS1) by controlling zero-crossing arc blowout of fault current which sends reverse current and forces the fault current to flow through the fast mechanical switch (FSD1), and then the direct current power supply (DCS) supplies power to the LOAD (LOAD) through the converter (VSC).
4. A low loss fast switching power supply (UPS) comprising a main converter (VSC), a first converter (VSC1), a second converter (VSC2), a first fast mechanical switch (FSD1) and a second fast mechanical switch (FSD 2); the method is characterized in that:
wherein one end of the main converter (VSC) is connected to the LOAD (LOAD), the other end of the main converter (VSC) is connected to one end of the first converter (VSC1) and the second converter (VSC2), respectively, the other end of the first converter (VSC1) is connected to the first ac power source (ACS1), the other end of the second converter (VSC2) is connected to the second ac power source (ACS2), one end of the first fast mechanical switch (FSD1) is connected to the first ac power source (ACS1), the other end of the first fast mechanical switch (FSD1) is connected to the LOAD (LOAD) and the second fast mechanical switch (FSD2), one end of the second fast mechanical switch (FSD2) is connected to the second ac power source (ACS2), the other end of the second fast mechanical switch (FSD2) is connected to the LOAD (LOAD) and the first fast mechanical switch (FSD 1).
5. A power supply switching method of switching a power supply (UPS) according to claim 4, wherein:
in normal operation, a first ac power source (ACS1) powers a LOAD (LOAD) via a first fast mechanical switch (FSD 1); when the first ac power source (ACS1) fails, the second ac power source (ACS2) powers the LOAD (LOAD) via the main converter (VSC) and the second converter (VSC 2); after waiting a set time and determining that the first ac power source (ACS1) is permanently malfunctioning, the second ac power source (ACS2) thereafter powers the LOAD (LOAD) via the second fast mechanical switch (FSD 2).
6. The power supply switching method according to claim 5, wherein:
the method for supplying the LOAD (LOAD) by the first alternating current source (ACS1) via the first fast mechanical switch (FSD1) is that the first fast mechanical switch (FSD1) is in a closing state, the second fast mechanical switch (FSD2) is in a breaking state, the main converter (VSC), the first converter (VSC1) and the second converter (VSC2) are in a hot standby state.
7. The power supply switching method of claim 6, wherein:
the method for supplying power to the LOAD (LOAD) by the second alternating current power supply (ACS2) through the main converter (VSC) and the second converter (VSC2) comprises the steps of separating the brake of the first quick mechanical switch (FSD1), unlocking the main converter (VSC) and the second converter (VSC2), and finishing the physical isolation of the LOAD (LOAD) and the first alternating current power supply (ACS1) by controlling the zero-crossing arc-out of fault current which sends out reverse current and forces to flow through the first quick mechanical switch (FSD 1).
8. The power supply switching method according to claim 7, wherein:
the method of the second alternating current source (ACS2) supplying power to the LOAD (LOAD) via the second fast mechanical switch (FSD2) is to close the second fast mechanical switch (FSD2), to latch the main converter (VSC), to the first converter (VSC1) and to the second converter (VSC 2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010073527.2A CN111082425A (en) | 2020-01-22 | 2020-01-22 | A kind of low-loss fast switching power supply and switching method thereof |
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| CN202010073527.2A CN111082425A (en) | 2020-01-22 | 2020-01-22 | A kind of low-loss fast switching power supply and switching method thereof |
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Cited By (3)
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| WO2024002358A1 (en) * | 2022-06-30 | 2024-01-04 | 施耐德电器工业公司 | Dual-power-source transfer switch based on solid-state switch |
| US12506357B2 (en) | 2022-06-30 | 2025-12-23 | Schneider Electric Industries Sas | Power source automatic transfer device |
| US12597801B2 (en) | 2022-06-30 | 2026-04-07 | Schneider Electric Industries Sas | Fast automatic transfer switching circuit and control method thereof |
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| US12597801B2 (en) | 2022-06-30 | 2026-04-07 | Schneider Electric Industries Sas | Fast automatic transfer switching circuit and control method thereof |
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Application publication date: 20200428 |