CN111740490A - Direct current output device supporting alternating current-direct current redundant input - Google Patents
Direct current output device supporting alternating current-direct current redundant input Download PDFInfo
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- CN111740490A CN111740490A CN202010748231.6A CN202010748231A CN111740490A CN 111740490 A CN111740490 A CN 111740490A CN 202010748231 A CN202010748231 A CN 202010748231A CN 111740490 A CN111740490 A CN 111740490A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a direct current output device supporting alternating current-direct current redundant input, which comprises: an ac input circuit configured to rectify an input ac power to provide a dc output; a DC input circuit configured to provide a DC output or to accept a DC input from an AC input circuit to charge the battery; the control circuit is configured to monitor the frequency of an alternating current power grid connected with the alternating current input circuit and control the direct current input circuit to provide direct current output to the output interface circuit according to the frequency of the alternating current power grid; an output interface circuit configured to provide a plurality of output interfaces for connection to an external load. The invention can control the direct current input circuit to intervene to make up the deficiency of the output power of the alternating current power grid when the output power of the alternating current power grid is insufficient, and control the direct current input circuit to receive the charge from the alternating current power grid when the output power of the alternating current power grid is sufficient, so as to ensure the stable work of a power supply system.
Description
Technical Field
The invention relates to the field of uninterrupted power supply design, in particular to a direct current output device supporting alternating current-direct current redundant input, which is used for ensuring the stable work of a power supply system.
Background
With the application of the direct current uninterruptible power supply becoming more and more extensive, the application scenario becomes more and more complex, and how to provide a direct current uninterruptible power supply which has more universality and can ensure the stability of the power supply system where the direct current uninterruptible power supply is located more safely and effectively is urgently needed in the current market.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, the present invention provides a dc output device supporting ac/dc redundant input, including: an AC input circuit connected to an AC power grid and configured to rectify an input AC power to provide a DC output; a DC input circuit comprising a battery configured to provide a DC output or accept a DC input from an AC input circuit to charge the battery; the control circuit is respectively connected with the direct current input circuit and the alternating current input circuit, is configured to monitor the frequency of an alternating current power grid connected with the alternating current input circuit, and controls the direct current input circuit to provide direct current output for the output interface circuit according to the frequency of the alternating current power grid; an output interface circuit, connected to the DC input circuit and the AC input circuit, respectively, configured to provide a plurality of output interfaces for connection to an external load.
In one or more embodiments, the control circuitry is further configured to: controlling the direct current input circuit and the alternating current input circuit to output direct current to the output interface circuit in the same direction in response to the fact that the frequency of the alternating current power grid is smaller than or equal to a preset threshold value; and controlling the direct current input circuit to cut off the direct current output to the output interface circuit and receiving the charge from the alternating current input circuit in response to the frequency of the alternating current power grid being greater than a preset threshold value.
In one or more embodiments, the dc input circuit further includes: the device comprises a direct current lightning surge protection module, a direct current EMI filtering module, a Boost module, a diode D1 and a diode D2; the storage battery, the direct current lightning surge protection module and the direct current EMI filtering module are sequentially connected and are connected with the positive end of a diode D2; the Boost module is connected with the negative end of the diode D1, and the Boost module and the diode D1 are coupled in series between the storage battery and the negative end of the diode D2.
In one or more embodiments, the ac input circuit includes: the lightning protection device comprises an alternating current lightning surge protection module, an alternating current EMI filtering module, an AC-DC conversion module and a diode D3; the alternating current power grid, the alternating current lightning surge protection module and the alternating current EMI filtering module are sequentially connected and are connected with the positive terminal of the diode D3; and the negative end of the diode D3 is connected with the output interface circuit.
In one or more embodiments, the control circuit includes: the device comprises a frequency monitoring module, a control module and a bidirectional controllable IGBT; the frequency monitoring module is respectively connected with the alternating current power grid and the control module, the control module is connected with the bidirectional controllable IGBT, and the bidirectional controllable IGBT is further respectively connected with the public end of the diode D1 and the diode D2 and the negative end of the diode D3.
In one or more embodiments, the control module is configured to control the IGBT to be in a first on state in response to the grid frequency being less than or equal to a preset threshold; and in a first conduction state, the storage battery is in conduction connection with the output interface circuit sequentially through the direct-current lightning surge protection circuit, the direct-current EMI filter circuit, the diode D2 and the bidirectional controllable IGBT.
In one or more embodiments, the control module is configured to control the IGBT to a second on state in response to the grid frequency being greater than a preset threshold; and in a second conduction state, the alternating current power grid is connected with the storage battery in a conduction mode through the alternating current lightning surge protection module, the alternating current EMI filtering module, the AC-DC conversion module, the diode D3, the bidirectional controllable IGBT, the diode D1 and the Boost module in sequence, and charges the storage battery.
In one or more embodiments, the bi-directionally controllable IGBT is an IGBT with bi-directional turn-on and bi-directional turn-off capabilities.
In one or more embodiments, the output interface circuit includes a plurality of DC-DC modules to provide DC outputs of a plurality of voltages.
In one or more embodiments, the plurality of DC-DC modules includes: the boost DC-DC module, the buck DC-DC module and/or the buck-boost DC-DC module.
The beneficial effects of the invention include: the direct current output device is provided with a direct current input circuit and an alternating current input circuit, and can simultaneously meet direct current input and alternating current input to provide direct current output. Thereby ensuring the stability of the operation of the power supply system. In addition, the direct current input circuit and the alternating current input circuit are both provided with a lightning surge protection module and an EMI filtering module, so that the power supply quality of the output direct current is further ensured. And, the output interface circuit can provide the interface of adaptation multiple voltage in order to satisfy the demand of different loads.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a dc output device supporting ac/dc redundant input according to the present invention;
fig. 2 is a control flow chart of the dc output device supporting ac/dc redundant input according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
In order to adapt to complex application scenes, such as application scenes with alternating current and direct current mixing, the invention provides a direct current output device supporting alternating current and direct current redundant input, which is used for ensuring the stability of a direct current low-voltage power supply system. The dc output device of the present invention is specifically shown below;
fig. 1 is a schematic structural diagram of a dc output device supporting ac/dc redundant input according to the present invention. In one embodiment, the dc output device of the present invention includes: the alternating current input circuit is connected with an alternating current power grid and is configured for rectifying input alternating current to provide direct current output; a DC input circuit including a battery configured to provide a DC output or to accept a DC input from an AC input circuit to charge the battery; the control circuit is respectively connected with the direct current input circuit and the alternating current input circuit, is configured to monitor the frequency of an alternating current power grid connected with the alternating current input circuit, and controls the direct current input circuit to provide direct current output for the output interface circuit according to the frequency of the alternating current power grid; and the output interface circuit is respectively connected with the direct current input circuit and the alternating current input circuit and is configured to provide a plurality of output interfaces so as to be connected with an external load.
The dc output device of the present invention is capable of providing both a dc input and an ac input to power a low voltage dc system connected thereto. The low-voltage direct-current power supply system comprises an alternating-current input mode, a direct-current input auxiliary power supply mode and a standby power supply mode, wherein the alternating-current input mode is used as a main power supply mode, and the direct-current input auxiliary power supply mode is used for selectively adding according to the condition of a load provided by an alternating-current power grid so as to ensure the stability of the low-voltage direct-current power supply system. For example, when the output power of the ac grid is insufficient, the dc input is added to ensure the power demand of the low voltage load. When the output power of the alternating current power grid is insufficient, the frequency of the alternating current power grid is often reduced along with the reduction of the frequency of the power grid, so that the addition of the direct current input is controlled by monitoring the frequency of the alternating current power grid, and the stability of the direct current output of the integral direct current output device is ensured. The specific control mode of the direct current input is as follows:
in a further embodiment, the control circuit is further configured to: when the frequency of the alternating current power grid is smaller than or equal to a preset threshold value, controlling the direct current input circuit and the alternating current input circuit to output direct current to the output interface circuit in the same direction; and when the frequency of the alternating current power grid is larger than a preset threshold value, the direct current input circuit is controlled to cut off the direct current output to the output interface circuit, and the charging from the alternating current input circuit is received. In order to more clearly explain the above process, the following describes the specific composition of the dc output device of the present invention in more detail.
In a further embodiment, the dc input circuit further comprises: the device comprises a direct current lightning surge protection module, a direct current EMI filtering module, a Boost module, a diode D1 and a diode D2; the storage battery, the direct current lightning surge protection module and the direct current EMI filtering module are sequentially connected and are connected with the positive end of a diode D2; the Boost module is connected with the negative end of the diode D1, and the Boost module and the diode D1 are coupled in series between the storage battery and the negative end of the diode D2.
Specifically, the first stage of the direct current output circuit is a direct current lightning surge protection circuit, which is used for lightning surge protection of a direct current output device or a system where the device is located so as to prevent transient high voltage from damaging a power supply and other equipment in the system; the second stage is a DC EMI filter circuit, mainly composed of basic filter components, including: adopting first-stage differential mode filtering, suppressing low-frequency differential mode noise of a Compact Peripheral Component Interconnect (CPCI) power supply by matching an X capacitor with a differential mode choke coil, and suppressing high-frequency common mode noise of the CPCI power supply by matching a Y capacitor with a common mode choke coil by adopting second-stage common mode filtering; the third stage is an ideal diode D2, which prevents the current from flowing backwards when the AC power supply supplies power, and avoids damaging the DC power supply equipment.
In a further embodiment, the ac input circuit includes: the lightning protection device comprises an alternating current lightning surge protection module, an alternating current EMI filtering module, an AC-DC conversion module and a diode D3; the alternating current power grid, the alternating current lightning surge protection module and the alternating current EMI filtering module are sequentially connected and are connected with the positive terminal of the diode D3; and the negative end of the diode D3 is connected with the output interface circuit.
Specifically, the first stage of the alternating current output circuit is an alternating current lightning surge protection circuit which is used for lightning surge protection of a direct current output device or a system where the device is located and preventing a power supply and other equipment in the system from being damaged by transient high voltage; the second stage is an alternating current EMI filter circuit, mainly composed of basic filter components and parts, including: adopting first-stage differential mode filtering, inhibiting low-frequency differential mode noise of the CPCI power supply by matching an X capacitor with a differential mode choke coil, adopting second-stage common mode filtering, and inhibiting high-frequency common mode noise of the CPCI power supply by matching a Y capacitor with a common mode choke coil; the third stage is an AC-DC conversion circuit, and in order to increase reliability and reduce the occupied area, a standard brick-type module is adopted to realize AC-DC conversion; the fourth stage is an ideal diode D3, which prevents the current from flowing backwards when the DC power supply is supplying power, so as to avoid damaging the AC-DC power supply module. Preferably, the AC-DC conversion circuit is implemented by using a standard brick module so as to be conveniently suitable for different AC power grids.
In a further embodiment, the control circuit comprises: the device comprises a frequency monitoring module, a control module and a bidirectional controllable IGBT; the frequency monitoring module is respectively connected with the alternating current power grid and the control module, the control module is connected with the bidirectional controllable IGBT, and the bidirectional controllable IGBT is further respectively connected with the public end of the diode D1 and the diode D2 and the negative end of the diode D3.
Specifically, the bidirectional controllable IGBT is an IGBT with bidirectional turn-on and bidirectional turn-off capabilities, and the control module is connected to a control end thereof and controls the turn-on direction of the controller by applying a forward or reverse voltage. When the power grid frequency is smaller than or equal to a preset threshold value, controlling the IGBT to be in a first conduction state; and in a first conduction state, the storage battery is in conduction connection with the output interface circuit sequentially through the direct-current lightning surge protection circuit, the direct-current EMI filter circuit, the diode D2 and the bidirectional controllable IGBT. At this time, the output interface circuit will respectively obtain the direct current output from the direct current input circuit and the alternating current output circuit. At this time, the direct current output by the direct current output circuit is used for making up for the deficiency of the output power of the alternating current output circuit.
When the power grid frequency is larger than a preset threshold value, controlling the IGBT to be in a second conduction state; and in a second conduction state, the alternating current power grid is connected with the storage battery in a conduction mode through the alternating current lightning surge protection module, the alternating current EMI filtering module, the AC-DC conversion module, the diode D3, the bidirectional controllable IGBT, the diode D1 and the Boost module in sequence, and charges the storage battery. At the moment, the external low-voltage direct-current equipment at the rear of the output interface circuit and the storage battery of the direct-current input circuit are both used as loads of the alternating-current power grid.
In a further embodiment, the output interface circuit includes a plurality of DC-DC modules to provide DC outputs of a plurality of voltages. The plurality of DC-DC modules includes: the boost DC-DC module, the buck DC-DC module and/or the buck-boost DC-DC module.
By the method, the direct current output supporting the alternating current and direct current input is realized, so that the universality of the direct current output device is stronger, and the direct current input is controlled to carry out auxiliary power supply when the output power of the alternating current power grid is insufficient by monitoring the power grid frequency, so that the working stability of a power supply system can be more reliably ensured.
In a preferred embodiment, the input interface circuit is built by adopting standard brick-type modules, and the number of the DC-DC modules can be properly increased according to the requirement to realize various voltage outputs and increase the output power.
In the above scheme, the control flow of the control module is as follows:
fig. 2 is a control flow chart of the dc output device supporting ac/dc redundant input according to the present invention. In this embodiment, the control flow includes: step S1, detecting the frequency of the alternating current power grid; step S2, judging whether the frequency of the alternating current power grid is greater than a preset threshold value; s3.1, in response to the fact that the frequency of the alternating current power grid is larger than a preset threshold value, controlling a direct current input circuit to cut off outputting direct current to an output interface circuit, and receiving charging from an alternating current input circuit; and S3.2, controlling the direct current input circuit and the alternating current input circuit to output direct current to the output interface circuit in the same direction in response to the fact that the frequency of the alternating current power grid is smaller than or equal to a preset threshold value.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the present disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
It should be understood that, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.
The numbers of the embodiments disclosed in the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (10)
1. A dc output device supporting ac/dc redundant input, the dc output device comprising:
an AC input circuit connected to an AC power grid and configured to rectify an input AC power to provide a DC output;
a DC input circuit comprising a battery configured to provide a DC output or accept a DC input from an AC input circuit to charge the battery;
the control circuit is respectively connected with the direct current input circuit and the alternating current input circuit, is configured to monitor the frequency of an alternating current power grid connected with the alternating current input circuit, and controls the direct current input circuit to provide direct current output for the output interface circuit according to the frequency of the alternating current power grid;
an output interface circuit, connected to the DC input circuit and the AC input circuit, respectively, configured to provide a plurality of output interfaces for connection to an external load.
2. The direct current output device of claim 1, wherein the control circuit is further configured to:
controlling the direct current input circuit and the alternating current input circuit to output direct current to the output interface circuit in the same direction in response to the fact that the frequency of the alternating current power grid is smaller than or equal to a preset threshold value;
and controlling the direct current input circuit to cut off the direct current output to the output interface circuit and receiving the charge from the alternating current input circuit in response to the frequency of the alternating current power grid being greater than a preset threshold value.
3. The dc output device of claim 2, wherein the dc input circuit further comprises: the device comprises a direct current lightning surge protection module, a direct current EMI filtering module, a Boost module, a first diode and a second diode;
the storage battery, the direct current lightning surge protection module and the direct current EMI filtering module are sequentially connected and are connected with the positive end of a second diode;
the Boost module is connected with the negative end of the first diode, and the Boost module and the first diode are coupled between the storage battery and the negative end of the second diode in series.
4. The dc output device of claim 3, wherein the ac input circuit comprises: the alternating current lightning surge protection module, the alternating current EMI filtering module, the AC-DC conversion module and the third diode;
the alternating current power grid, the alternating current lightning surge protection module and the alternating current EMI filtering module are sequentially connected and are connected with the positive end of the third diode;
and the negative pole end of the third diode is connected with the output interface circuit.
5. The dc output apparatus of claim 4, wherein the control circuit comprises:
the device comprises a frequency monitoring module, a control module and a bidirectional controllable IGBT;
the frequency monitoring module is respectively connected with the alternating current power grid and the control module, the control module is connected with the bidirectional controllable IGBT, and the bidirectional controllable IGBT is further respectively connected with the public ends of the first diode and the second diode and the negative end of the third diode.
6. The direct current output device according to claim 5, wherein the control module is configured to control the IGBT to be in a first conduction state in response to the grid frequency being less than or equal to a preset threshold value;
and in a first conduction state, the storage battery is in conduction connection with the output interface circuit sequentially through the direct-current lightning surge protection circuit, the direct-current EMI filter circuit, the second diode and the bidirectional controllable IGBT.
7. The DC output device according to claim 5, wherein the control module is configured to control the IGBT to a second conduction state in response to the grid frequency being greater than a preset threshold;
and in a second conduction state, the alternating current power grid is connected with the storage battery in a conduction mode sequentially through the alternating current lightning surge protection module, the alternating current EMI filtering module, the AC-DC conversion module, the third diode, the bidirectional controllable IGBT, the first diode and the Boost module, and charges the storage battery.
8. A DC output device according to any of claims 5-7, characterized in that the bi-directionally controllable IGBT is an IGBT with bi-directionally turn-on and bi-directionally turn-off capabilities.
9. The DC output device of claim 1, wherein the output interface circuit comprises a plurality of DC-DC modules for providing DC outputs of a plurality of voltages.
10. The direct current output device according to claim 9, wherein the plurality of DC-DC modules include: the boost DC-DC module, the buck DC-DC module and/or the buck-boost DC-DC module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010748231.6A CN111740490A (en) | 2020-07-30 | 2020-07-30 | Direct current output device supporting alternating current-direct current redundant input |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010748231.6A CN111740490A (en) | 2020-07-30 | 2020-07-30 | Direct current output device supporting alternating current-direct current redundant input |
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| CN111740490A true CN111740490A (en) | 2020-10-02 |
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| CN202010748231.6A Pending CN111740490A (en) | 2020-07-30 | 2020-07-30 | Direct current output device supporting alternating current-direct current redundant input |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114069829A (en) * | 2021-11-22 | 2022-02-18 | 北京计算机技术及应用研究所 | Double-circuit redundant power supply auto-switch and recovery circuit |
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| CN114069829B (en) * | 2021-11-22 | 2023-09-26 | 北京计算机技术及应用研究所 | Dual-path redundant power supply self-cutting and recovering circuit |
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Application publication date: 20201002 |
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