CN110932572B - Direct current power supply circuit and system - Google Patents

Direct current power supply circuit and system Download PDF

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Publication number
CN110932572B
CN110932572B CN201911089382.9A CN201911089382A CN110932572B CN 110932572 B CN110932572 B CN 110932572B CN 201911089382 A CN201911089382 A CN 201911089382A CN 110932572 B CN110932572 B CN 110932572B
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China
Prior art keywords
power supply
converter
supply interface
interface
current
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CN201911089382.9A
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Chinese (zh)
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CN110932572A (en
Inventor
王洪
黄彬
孙永峰
尹中恒
赵立成
王少博
王翀
周晓燕
郑明才
尹强
黄军伟
陈军阳
于磊
王和
袁永明
卢志涛
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State Grid Corp of China SGCC
Xuji Power Co Ltd
KME Sp zoo
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State Grid Corp of China SGCC
Xuji Power Co Ltd
KME Sp zoo
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Priority to CN201911089382.9A priority Critical patent/CN110932572B/en
Publication of CN110932572A publication Critical patent/CN110932572A/en
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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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to a direct-current power supply circuit and a system, belonging to the technical field of power systems, and comprising an alternating-current power supply interface, an AC/DC converter, a direct-current output interface, a first power supply interface, a second power supply interface and a charging and discharging combined circuit; the charging and discharging combined circuit comprises a first DC/DC converter, a second DC/DC converter, a first switch, a first one-way isolation element and a second one-way isolation element; and the charging and discharging functions of the two power supply interfaces to the outside and the charging and discharging functions between the two power supply interfaces are completed through the connection relationship between each component in the charging and discharging combined circuit and the AC/DC converter and the like. The problems that a direct-current power supply system in the prior art cannot be precisely controlled and the performance of a battery cannot be fully utilized are solved.

Description

Direct current power supply circuit and system
Technical Field
The invention relates to a direct-current power supply circuit and a direct-current power supply system, and belongs to the technical field of power systems.
Background
The direct-current power supply system is generally applied to places such as a power plant, a transformer substation, a power distribution room and the like, generally provides electric energy for electric equipment through AC/DC conversion, and because some important electric equipment cannot be powered off, energy is stored through a storage battery on the basis of AC/DC conversion, the AC/DC conversion with the stored energy of the storage battery forms a core part of the direct-current power supply system, and under normal conditions, the AC/DC converter provides the electric energy for the electric equipment on one hand and charges the storage battery as standby electric energy on the other hand; when the alternating current power grid fails, the storage battery stores energy to provide electric energy for the electric equipment.
The DC operation power supply system generally includes an AC/DC converter for converting AC power into DC power, a battery pack for storing electric energy, and a monitoring system for monitoring an operation state of the DC power supply system, and adjusting and controlling the operation state if necessary. The current AC/DC conversion is generally completed in a high-frequency PWM control mode, the system volume is relatively small, and the control process is relatively flexible. However, the existing DC operating power supply usually realizes the control and adjustment of the power supply output only by regulating the AC/DC conversion, and the storage battery pack therein does not realize effective development and utilization.
Therefore, the conventional dc power supply system has the following problems:
(1) The existing direct current power supply system is generally not finely controlled;
(2) The comprehensive performance of the battery is not fully optimized, and the performance potential of the battery is not fully exerted.
Disclosure of Invention
The invention aims to provide a direct-current power supply circuit and a direct-current power supply system, which are used for solving the problems that a direct-current power supply system in the prior art cannot be finely controlled and the performance of a battery cannot be fully utilized.
The invention adopts the following technical scheme: a direct-current power supply circuit comprises an alternating-current power supply interface, an AC/DC converter, a direct-current output interface, a first power supply interface, a second power supply interface and a charging and discharging combined circuit; the charging and discharging combined circuit comprises a first DC/DC converter, a second DC/DC converter, a first switch, a first one-way isolation element and a second one-way isolation element;
the input end of the AC/DC converter is connected with the alternating current power supply interface, and the output end of the AC/DC converter is connected with the direct current output interface;
the output end of the AC/DC converter is connected with the first power supply interface through a first switch and used for supplying power to the first power supply interface;
the first unidirectional isolation element is connected between the first power supply interface and the output end of the AC/DC converter and is used for isolating the current output to the first power supply interface by the AC/DC converter;
the second unidirectional isolation element is connected between the second power supply interface and the output end of the AC/DC converter and is used for isolating the current output by the AC/DC converter to the second power supply interface;
the first power supply interface is connected with the second power supply interface through a first DC/DC converter, and the first DC/DC converter is used for controlling the charging process from the first power supply interface to the second power supply interface;
the second power supply interface is connected with the first power supply interface through a second DC/DC converter, and the second DC/DC converter is used for controlling the charging process of the second power supply interface to the first power supply interface.
According to the invention, two power supply interfaces and corresponding charging and discharging combination circuits are arranged between the AC/DC converter and the DC output interface in the DC power supply circuit, and the corresponding first DC/DC converter and second DC/DC converter, the switch connected with the first power supply interface and the second power supply interface, the one-way isolating element and the like are arranged between the power supply interfaces in the charging and discharging combination circuits, so that the AC/DC converter is controlled to regulate the output voltage, and meanwhile, the allowable fluctuation of the AC/DC converter is mutually matched with other power supply elements by combining the electric energy transfer process of the power supply equipment connected with the two power supply interfaces, and the fine control of energy supply output is realized. Meanwhile, the power supply equipment connected with the two power supply interfaces in the system can run in parallel to increase the energy storage capacity of the direct-current power supply system.
Further, the DC power supply circuit includes a controller that samples a voltage at the AC/DC output, a current flowing through the first switch, a current flowing through the first unidirectional isolation element, a current flowing through the second unidirectional isolation element, a voltage at the first power supply interface, and a voltage at the second power supply interface; the controller controls and connects the AC/DC converter, the first switch, the first DC/DC converter and the second DC/DC converter.
Furthermore, the output end of the AC/DC converter is also connected with a third one-way isolation element.
Further, the first DC/DC converter and the second DC/DC converter are boost converters.
Further, the first unidirectional isolation element, the second unidirectional isolation element and the third unidirectional isolation element are diodes; the first switch is an MOS switch tube.
The invention also provides a direct current power supply system, which comprises an alternating current power supply and a direct current power supply circuit; the direct-current power supply circuit comprises an alternating-current power supply interface, an AC/DC converter, a direct-current output interface, a first power supply interface, a second power supply interface and a charging and discharging combined circuit; the charging and discharging combination circuit comprises a first DC/DC converter, a second DC/DC converter, a first switch, a first one-way isolation element and a second one-way isolation element;
the input end of the AC/DC converter is connected with an alternating current power supply interface, and the output end of the AC/DC converter is connected with a direct current output interface;
the output end of the AC/DC converter is connected with the first power supply interface through a first switch and used for supplying power to the first power supply interface;
the first unidirectional isolation element is connected between the first power supply interface and the output end of the AC/DC converter and is used for isolating the current output by the AC/DC converter to the first power supply interface;
the second unidirectional isolation element is connected between the second power supply interface and the output end of the AC/DC converter and is used for isolating the current output by the AC/DC converter to the second power supply interface;
the first power supply interface is connected with the second power supply interface through a first DC/DC converter, and the first DC/DC converter is used for controlling the charging process from the first power supply interface to the second power supply interface;
the second power supply interface is connected with the first power supply interface through a second DC/DC converter, and the second DC/DC converter is used for controlling the charging process of the second power supply interface to the first power supply interface.
According to the invention, two power supply interfaces and corresponding charging and discharging combination circuits are arranged between the AC/DC converter and the DC output interface in the DC power supply system, and the corresponding first DC/DC converter and second DC/DC converter, the switch connected with the first power supply interface and the second power supply interface, the one-way isolating element and the like are arranged between the power supply interfaces in the charging and discharging combination circuits, so that the AC/DC converter is controlled to regulate the output voltage, and meanwhile, the allowable fluctuation of the AC/DC converter is matched with other power supply elements in combination with the electric energy transfer process of the power supply equipment connected with the two power supply interfaces, and the fine control of energy supply output is realized. Meanwhile, the power supply equipment connected with the two power supply interfaces in the system can run in parallel to increase the energy storage capacity of the direct-current power supply system.
Further, the DC power supply circuit includes a controller that samples a voltage at the AC/DC output, a current flowing through the first switch, a current flowing through the first unidirectional isolation element, a current flowing through the second unidirectional isolation element, a voltage at the first power supply interface, and a voltage at the second power supply interface; the controller controls and connects the AC/DC converter, the first switch, the first DC/DC converter and the second DC/DC converter.
Furthermore, the output end of the AC/DC converter is also connected with a third one-way isolation element.
Further, the first DC/DC converter and the second DC/DC converter are boost converters.
Further, the first unidirectional isolation element, the second unidirectional isolation element and the third unidirectional isolation element are diodes; the first switch is an MOS switch tube.
Drawings
FIG. 1 is a block diagram of a DC power system in an embodiment of the DC power system of the present invention;
fig. 2 is a schematic diagram of a dc power supply system in an embodiment of the dc power supply system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
DC power supply system embodiment:
fig. 1 shows a block diagram of a dc power supply system in this embodiment, which includes an ac power supply and a dc power supply circuit. The DC power supply circuit includes: the battery pack charging and discharging device comprises an AC/DC converter, a charging and discharging combination circuit, a first power supply interface corresponding to a first battery pack (hereinafter referred to as a battery pack 1), a second power supply interface corresponding to a second battery pack (hereinafter referred to as a battery pack 2), a controller and a direct current output interface for connecting electric equipment. The AC/DC converter completes conversion from alternating current to direct current and a charging function of the battery pack 1, the charging and discharging combination circuit completes charging and discharging of the battery pack and charging and discharging between batteries, the battery pack 1 and the battery pack 2 are used for alternately charging and discharging and storing energy, and the controller completes system and battery state detection and controls high-quality output of the system and comprehensive performance optimization of the batteries according to the system and the battery states.
As shown in fig. 2, this embodiment provides specific circuit compositions of the charge and discharge combination circuit in the dc power supply system: the DC/DC converter comprises a first DC/DC converter, a second DC/DC converter, a first switch, a first one-way isolation element and a second one-way isolation element; the input end of the AC/DC converter is connected with an alternating current power supply interface, and the output end of the AC/DC converter is connected with a direct current output interface; the output end of the AC/DC converter is connected with the first power supply interface through a first switch and used for supplying power to the first power supply interface; one end of the first unidirectional isolation element is connected with the first power supply interface, and the other end of the first unidirectional isolation element is connected with the output end of the AC/DC converter and is used for isolating the current output by the AC/DC converter to the first power supply interface; one end of the second one-way isolating element is connected with the second power supply interface, and the other end of the second one-way isolating element is connected with the output end of the AC/DC converter and is used for isolating the current output to the second power supply interface by the AC/DC converter; the first power supply interface is connected with the second power supply interface through the first DC/DC converter, so that the charging process from the first power supply interface to the second power supply interface is controlled through the first DC/DC converter; the second power supply interface is connected with the first power supply interface through the second DC/DC converter, so that the charging process of the second power supply interface to the first power supply interface is controlled through the second DC/DC converter.
Specifically, in the present embodiment, the DC/DC converter is implemented by a boost converter, as shown in fig. 2, as another embodiment, it may be implemented by another converter, such as a bridge DC/DC circuit.
The first DC/DC converter composed of Q1, Q3, L1, D3 constitutes an electric energy transfer path from the battery pack 1 to the battery pack 2 for discharging the battery pack 1 to the battery pack 2. When Q3 is conducted, the electric energy transfer from the battery pack 1 to the battery pack 2 is started, when Q1 is conducted, the electric energy of the battery pack 1 is stored in the inductor L1, and when Q1 is turned off, the energy in the inductor L1 is stored in the battery pack 2.
The second DC/DC converter composed of Q2, Q4, L2, and D4 constitutes an electric energy transfer path from the battery pack 2 to the battery pack 1, for discharging the battery pack 2 to the battery pack 1. When Q4 is conducted, the electric energy transfer from the battery pack 2 to the battery pack 1 is started, when Q2 is conducted, the electric energy of the battery pack 2 is stored in the inductor L2, and when Q2 is turned off, the energy in the inductor L2 is stored in the battery pack 1.
Meanwhile, the output end of the AC/DC is also connected with a one-way isolation element D0 to realize one-way output. The battery pack 1 and the battery pack 2 respectively output electric energy to the direct current output interface through the single-phase isolation diodes D1 and D2, so that the output end of the AC/DC is effectively isolated from the corresponding energy supply interface, and the switch Q0 is used for controlling whether the AC/DC converter charges the battery pack 1 or not.
In this embodiment, D0, D1, D2, D3 are unidirectional isolation diodes, Q0, Q1, Q2, Q3, Q4 are MOS switch tubes, L1, L2 are high frequency inductors, and r is fz The equivalent load of the electric equipment. As other embodiments, the first isolation element, the second isolation element, the third isolation element, and the like in this embodiment may also adopt other forms of arrangements having a unidirectional isolation function.
The voltage polarity, current and control signal flow directions in this embodiment are given in fig. 2. The controller samples the voltage and the current of the AC/DC output end, the current flowing through the first switch, the current flowing through the first one-way isolation element, the current flowing through the second one-way isolation element, the voltage of the first power supply interface and the voltage of the second power supply interface; the controller controls and connects the AC/DC converter, the first switch, the first DC/DC converter and the second DC/DC converter.
Specifically, the AC/DC converter performs AC-to-DC conversion, functions of charging the electric device, and functions of charging the battery pack 1, and outputs a DC output voltage u o0 Controlled voltage signal u g After passing through a one-way isolating diode D0, the voltage is used as the output voltage u of the direct-current power supply system o 。
The MOS switch tube Q0 controls whether the AC/DC converter charges the battery pack or not, when the Q0 is switched on, the AC/DC converter charges the battery pack, and when the Q0 is switched off, the AC/DC converter stops charging the battery pack.
The unidirectional isolation diodes D1 and D2 finish the natural switching of whether the battery pack outputs electric energy to the direct current power supply system or not, and when the direct current power supply system outputs voltage u o Higher than voltage u at battery 1 o1 And voltage u at battery pack 2 o2 When the direct current power supply system is started, the battery pack outputs electric energy to the direct current power supply system; when the output voltage u of the DC power supply system o Below the terminal voltage u of the battery 1 o1 Or terminal voltage u of battery pack 2 o2 And meanwhile, the battery pack outputs electric energy to the direct current power supply system.
In FIG. 2, "-u in "is AC input voltage," u o0 "is the DC output voltage of the AC/DC converter," i o0 "is the output current of the AC/DC converter," u o "is the DC output voltage of the DC power supply system," u o1 "is terminal voltage of battery pack 1," i c "is a charging current of the battery pack 1," i o1 "supply current for the battery pack 1 to the dc power supply system," i 12 "is the discharge current from the battery 1 to the battery 2," u o2 "is terminal voltage of the battery pack 2," i o2 "supply current for the battery pack 2 to the dc power supply system," i 21 "is a discharge current from the battery pack 2 to the battery pack 1," i fz "is a load current supplied to the electric equipment," s0 "is a control signal of the MOS transistor Q0," s1 "is a control signal of the MOS transistor Q1," s2 "is a control signal of the MOS transistor Q2," s3 "is a control signal of the MOS transistor Q3," s4 "is a control signal of the MOS transistor Q4," u g "is the control voltage signal that the controller gives to the AC/DC converter.
In this embodiment, the auxiliary power supply further includes an auxiliary power supply, the auxiliary power supply uses a universal single-ended flyback power supply circuit to generate multiple direct-current output voltages, and provides working power supply inputs for the AC/DC converter and the detection and controller, respectively, "Vcc2" in fig. 2 is a working power supply input of the AC/DC converter, and "Vcc1" is a working power supply input of the detection and controller.
The controller detects the output state quantities of the direct current power supply system and the battery by using the digital control circuit, estimates the state and parameters of the battery, determines the expected working states of the AC/DC converter and the battery pack, and generates control signals to control the actual working states of the AC/DC converter and the battery pack to respectively approach to the respective expected states.
As another embodiment, in this embodiment, the power supply device connected to the first power supply interface and the second power supply interface is not limited to a battery pack, and may also be other devices, such as other types of energy storage elements, such as an energy storage capacitor. And the battery pack may be a rechargeable battery such as a lithium battery, a lead-acid battery, or the like.
DC power supply circuit embodiment:
the embodiment provides a direct-current power supply circuit structure which comprises an alternating-current power supply interface, an AC/DC converter, a direct-current output interface, a first power supply interface, a second power supply interface and a charging and discharging combined circuit, wherein the alternating-current power supply interface is connected with the first power supply interface; the charging and discharging combination circuit comprises a first DC/DC converter, a second DC/DC converter, a first switch, a first one-way isolation element and a second one-way isolation element;
the input end of the AC/DC converter is connected with an alternating current power supply interface, and the output end of the AC/DC converter is connected with a direct current output interface;
the output end of the AC/DC converter is connected with the first power supply interface through a first switch and used for supplying power to the first power supply interface;
one end of the first unidirectional isolation element is connected with the first power supply interface, and the other end of the first unidirectional isolation element is connected between the AC/DC converter and the direct current output interface and used for isolating the first power supply interface and the output end of the AC/DC converter;
one end of the second unidirectional isolation element is connected with the second power supply interface, and the other end of the second unidirectional isolation element is connected between the AC/DC converter and the direct current output interface and used for isolating the second power supply interface and the output end of the AC/DC converter;
the first power supply interface is connected with the second power supply interface through the first DC/DC converter;
and the second power supply interface is connected with the first power supply interface through a second DC/DC converter.
The dc power circuit provided in this embodiment is the dc power circuit in the dc power system, and the specific connection relationship and composition principle of the power circuit have been described in detail in the embodiment of the dc power system, and are not described herein again.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all equivalent structural changes made by using the contents of the specification and the drawings of the present invention should be covered by the scope of the present invention.

Claims (10)

1. A direct current power supply circuit is characterized by comprising an alternating current power supply interface, an AC/DC converter, a direct current output interface, a first power supply interface, a second power supply interface and a charging and discharging combined circuit; the charging and discharging combination circuit comprises a first DC/DC converter, a second DC/DC converter, a first switch, a first one-way isolation element and a second one-way isolation element;
the input end of the AC/DC converter is connected with an alternating current power supply interface, and the output end of the AC/DC converter is connected with a direct current output interface;
the output end of the AC/DC converter is connected with the first power supply interface through a first switch and used for supplying power to the first power supply interface;
the first unidirectional isolation element is connected between the first power supply interface and the output end of the AC/DC converter and is used for isolating the current output by the AC/DC converter to the first power supply interface;
the second unidirectional isolation element is connected between the second power supply interface and the output end of the AC/DC converter and is used for isolating the current output to the second power supply interface by the AC/DC converter;
the first power supply interface is connected with the second power supply interface through a first DC/DC converter, and the first DC/DC converter is used for controlling the charging process from the first power supply interface to the second power supply interface;
the second power supply interface is connected with the first power supply interface through a second DC/DC converter, and the second DC/DC converter is used for controlling the charging process of the second power supply interface to the first power supply interface.
2. The DC power supply circuit of claim 1, comprising a controller that samples a voltage at the AC/DC output, a current through the first switch, a current through the first unidirectional isolation element, a current through the second unidirectional isolation element, a voltage at the first power supply interface, and a voltage at the second power supply interface; the controller controls and connects the AC/DC converter, the first switch, the first DC/DC converter and the second DC/DC converter.
3. The DC power supply circuit of claim 1, wherein a third unidirectional isolation element is further connected to the output of the AC/DC converter.
4. The direct current power supply circuit according to claim 1, wherein the first DC/DC converter and the second DC/DC converter are boost converters.
5. The direct current power supply circuit according to claim 3, wherein the first unidirectional isolation element, the second unidirectional isolation element, and the third unidirectional isolation element are diodes; the first switch is an MOS switch tube.
6. A direct current power supply system is characterized by comprising an alternating current power supply and a direct current power supply circuit; the direct-current power supply circuit comprises an alternating-current power supply interface, an AC/DC converter, a direct-current output interface, a first power supply interface, a second power supply interface and a charging and discharging combined circuit; the charging and discharging combination circuit comprises a first DC/DC converter, a second DC/DC converter, a first switch, a first one-way isolation element and a second one-way isolation element;
the input end of the AC/DC converter is connected with the alternating current power supply interface, and the output end of the AC/DC converter is connected with the direct current output interface;
the output end of the AC/DC converter is connected with the first power supply interface through a first switch and used for supplying power to the first power supply interface;
the first unidirectional isolation element is connected between the first power supply interface and the output end of the AC/DC converter and is used for isolating the current output by the AC/DC converter to the first power supply interface;
the second unidirectional isolation element is connected between the second power supply interface and the output end of the AC/DC converter and is used for isolating the current output by the AC/DC converter to the second power supply interface;
the first power supply interface is connected with the second power supply interface through a first DC/DC converter, and the first DC/DC converter is used for controlling the charging process from the first power supply interface to the second power supply interface;
the second power supply interface is connected with the first power supply interface through a second DC/DC converter, and the second DC/DC converter is used for controlling the charging process of the second power supply interface to the first power supply interface.
7. The DC power supply system of claim 6, wherein the DC power supply circuit comprises a controller that samples a voltage at the AC/DC output, a current through the first switch, a current through the first unidirectional isolation element, a current through the second unidirectional isolation element, a voltage at the first power supply interface, and a voltage at the second power supply interface; the controller controls and connects the AC/DC converter, the first switch, the first DC/DC converter and the second DC/DC converter.
8. The DC power supply system of claim 6, wherein a third unidirectional isolation element is further connected to the output of the AC/DC converter.
9. The direct current power supply system according to claim 6, wherein the first DC/DC converter and the second DC/DC converter are boost converters.
10. The dc power supply system of claim 8, wherein the first, second, and third unidirectional isolation elements are diodes; the first switch is an MOS switch tube.
CN201911089382.9A 2019-11-08 2019-11-08 Direct current power supply circuit and system Active CN110932572B (en)

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