CN110932572B - Direct current power supply circuit and system - Google Patents
Direct current power supply circuit and system Download PDFInfo
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- 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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- 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
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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
- 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
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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
- 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
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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
- H02M1/0003—Details of control, feedback or regulation circuits
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- 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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Abstract
本发明涉及一种直流电源电路及系统，属于电力系统技术领域，包括交流电源接口、AC/DC变换器、直流输出接口、第一供电接口、第二供电接口和充放电组合电路；所述充放电组合电路包括第一DC/DC变换器、第二DC/DC变换器、第一开关、第一单向隔离元件和第二单向隔离元件；通过充放电组合电路中的各元器件与AC/DC变换器等的连接关系，完成两个供电接口对外的充放电和两个供电接口之间的充电放电功能。解决现有技术中存在的直流电源系统不能够精细控制、电池性能不能充分利用的问题。
The invention relates to a DC power supply circuit and system, belonging to the technical field of electric power systems, including an AC power supply interface, an AC/DC converter, a DC output interface, a first power supply interface, a second power supply interface and a charging and discharging combination circuit; The discharge combination circuit includes a first DC/DC converter, a second DC/DC converter, a first switch, a first unidirectional isolation element and a second unidirectional isolation element; through the components and parts in the charge and discharge combination circuit and the AC /DC converter, etc., to complete the external charging and discharging functions of the two power supply interfaces and the charging and discharging functions between the two power supply interfaces. The invention solves the problems in the prior art that the DC power supply system cannot be finely controlled and the performance of the battery cannot be fully utilized.
Description
技术领域technical field
本发明涉及一种直流电源电路及系统，属于电力系统技术领域。The invention relates to a DC power supply circuit and system, belonging to the technical field of power systems.
背景技术Background technique
直流电源系统在发电厂、变电站、配电房等场所应用普遍，一般通过AC/DC变换给用电设备提供电能，因有些重要用电设备不允许断电，故在AC/DC变换的基础上通过蓄电池储能，带蓄电池储能的AC/DC变换构成直流电源系统的核心部分，正常情况下AC/DC变换器一方面给用电设备提供电能，另一方面给蓄电池充电作为备用电能；交流电网故障时，由蓄电池储能给用电设备提供电能。DC power supply systems are widely used in power plants, substations, power distribution rooms and other places. Generally, AC/DC conversion is used to provide electrical energy to electrical equipment. Because some important electrical equipment is not allowed to be powered off, it is based on AC/DC conversion. Through battery energy storage, the AC/DC conversion with battery energy storage constitutes the core part of the DC power supply system. Under normal circumstances, the AC/DC converter provides power to the electrical equipment on the one hand, and charges the battery as backup power on the other hand; AC When the power grid fails, the energy storage of the battery provides power to the electrical equipment.
直流操作电源系统一般由AC/DC变换、蓄电池组、监控系统等组成，AC/DC将交流电变换为直流电，蓄电池组用来储存电能，监控系统用来监控直流电源系统的运行状态，必要时给予调节和控制。目前的AC/DC变换一般通过高频PWM控制方式完成，系统体积相对较小，控制过程相对灵活。但是，现有的直流操作电源，通常是仅通过对AC/DC变换进行调节，实现对供电输出的控制调整，而其中的蓄电池组并没有实现有效的开发利用。The DC operating power supply system is generally composed of AC/DC conversion, battery pack, monitoring system, etc. AC/DC converts AC power into DC power, the battery pack is used to store electric energy, and the monitoring system is used to monitor the operating status of the DC power supply system. Regulation and control. The current AC/DC conversion is generally completed by high-frequency PWM control, the system volume is relatively small, and the control process is relatively flexible. However, the existing DC operating power supply usually only adjusts the AC/DC conversion to realize the control and adjustment of the power supply output, and the battery pack in it has not been effectively developed and utilized.
因而，现有直流电源系统存在以下问题：Therefore, the existing DC power supply system has the following problems:
(1)现有直流电源系统中一般没有被精细控制；(1) The existing DC power supply system is generally not finely controlled;
(2)电池的综合性能没有被充分优化，电池性能潜力没有被充分发挥。(2) The comprehensive performance of the battery has not been fully optimized, and the performance potential of the battery has not been fully utilized.
发明内容Contents of the invention
本发明的目的在于提供一种直流电源电路及系统，以解决现有技术中存在的直流电源系统不能够精细控制、电池性能不能充分利用的问题。The purpose of the present invention is to provide a DC power supply circuit and system to solve the problems in the prior art that the DC power supply system cannot be finely controlled and the performance of the battery cannot be fully utilized.
本发明采用如下技术方案：一种直流电源电路，包括交流电源接口、AC/DC变换器、直流输出接口、第一供电接口、第二供电接口和充放电组合电路；所述充放电组合电路包括第一DC/DC变换器、第二DC/DC变换器、第一开关、第一单向隔离元件和第二单向隔离元件；The present invention adopts the following technical solutions: a DC power supply circuit, including an AC power supply interface, an AC/DC converter, a DC output interface, a first power supply interface, a second power supply interface, and a charge-discharge combination circuit; the charge-discharge combination circuit includes a first DC/DC converter, a second DC/DC converter, a first switch, a first unidirectional isolation element, and a second unidirectional isolation element;
所述AC/DC变换器的输入端连接交流电源接口，AC/DC变换器的输出端连接直流输出接口；The input end of the AC/DC converter is connected to the AC power interface, and the output end of the AC/DC converter is connected to the DC output interface;
所述AC/DC变换器的输出端通过第一开关连接所述第一供电接口，用于向第一供电接口供电；The output terminal of the AC/DC converter is connected to the first power supply interface through a first switch, and is used to supply power to the first power supply interface;
所述第一单向隔离元件连接在第一供电接口与AC/DC变换器的输出端之间，用于隔离AC/DC变换器向第一供电接口输出的电流；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 to isolate the current output by the AC/DC converter to the first power supply interface;
所述第二单向隔离元件连接在第二供电接口与AC/DC变换器的输出端之间，用于隔离AC/DC变换器向第二供电接口输出的电流；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 to isolate the current output by the AC/DC converter to the second power supply interface;
所述第一供电接口通过第一DC/DC变换器连接第二供电接口，第一DC/DC变换器用于控制第一供电接口向第二供电接口的充电过程；The first power supply interface is connected to the second power supply interface through a first DC/DC converter, and the first DC/DC converter is used to control the charging process from the first power supply interface to the second power supply interface;
所述第二供电接口通过第二DC/DC变换器连接第一供电接口，第二DC/DC变换器用于控制第二供电接口向第一供电接口的充电过程。The second power supply interface is connected to the first power supply interface through a second DC/DC converter, and the second DC/DC converter is used to control the charging process from the second power supply interface to the first power supply interface.
本发明通过在直流电源电路中AC/DC变换器与直流输出接口之间设置两个供电接口以及对应的充放电组合电路，并通过充放电组合电路中在供电接口之间设置对应的第一DC/DC变换器和第二DC/DC变换器，以及连接第一、二供电接口的开关、单向隔离元件等，从而在控制AC/DC变换器进行输出电压调整的同时，结合两个供电接口所连接的供电设备的电能转移过程，使得AC/DC变换器的允许波动与其他供电元件相互配合，实现对供能输出的精细控制。同时，系统中的两个供电接口所连接的供电设备可并行运行以增加直流电源系统的储能容量。In the present invention, two power supply interfaces and corresponding charging and discharging combination circuits are set between the AC/DC converter and the DC output interface in the DC power supply circuit, and the corresponding first DC is set between the power supply interfaces in the charging and discharging combination circuit. /DC converter and the second DC/DC converter, as well as switches connected to the first and second power supply interfaces, unidirectional isolation elements, etc., so as to combine the two power supply interfaces while controlling the AC/DC converter to adjust the output voltage The power transfer process of the connected power supply equipment makes the allowable fluctuation of the AC/DC converter cooperate with other power supply components to achieve fine control of the power supply output. At the same time, the power supply equipment connected to the two power supply interfaces in the system can run in parallel to increase the energy storage capacity of the DC power supply system.
进一步的，所述直流电源电路包括控制器，所述控制器采样AC/DC输出端的电压、AC/DC输出端的电流、流过第一开关的电流、流过第一单向隔离元件的电流、流过第二单向隔离元件的电流、第一供电接口的电压和第二供电接口的电压；所述控制器控制连接所述AC/DC变换器、第一开关、第一DC/DC变换器和第二DC/DC变换器。Further, the DC power supply circuit includes a controller, and the controller samples the voltage at the AC/DC output terminal, the current at the AC/DC output terminal, the current flowing through the first switch, the current flowing through the first unidirectional isolation element, The current flowing through the second unidirectional isolation element, the voltage of the first power supply interface and the voltage of the second power supply interface; the controller controls the connection of the AC/DC converter, the first switch, and the first DC/DC converter and a second DC/DC converter.
进一步的，所述AC/DC变换器的输出端还连接有第三单向隔离元件。Further, the output end of the AC/DC converter is further connected with a third unidirectional isolation element.
进一步的，所述第一DC/DC变换器和第二DC/DC变换器为boost升压变换器。Further, the first DC/DC converter and the second DC/DC converter are boost converters.
进一步的，所述第一单向隔离元件、第二单向隔离元件和第三单向隔离元件为二极管；所述第一开关为MOS开关管。Further, the first unidirectional isolation element, the second unidirectional isolation element and the third unidirectional isolation element are diodes; the first switch is a MOS switch.
本发明还提出了一种直流电源系统，包括交流电源和直流电源电路；所述直流电源电路包括交流电源接口、AC/DC变换器、直流输出接口、第一供电接口、第二供电接口和充放电组合电路；所述充放电组合电路包括第一DC/DC变换器、第二DC/DC变换器、第一开关、第一单向隔离元件和第二单向隔离元件；The present invention also proposes a DC power supply system, including an AC power supply and a DC power supply circuit; the DC power supply circuit includes an AC power supply interface, an AC/DC converter, a DC output interface, a first power supply interface, a second power supply interface and a charging A discharge combination circuit; the charge and discharge combination circuit includes a first DC/DC converter, a second DC/DC converter, a first switch, a first unidirectional isolation element, and a second unidirectional isolation element;
所述AC/DC变换器的输入端连接交流电源接口，AC/DC变换器的输出端连接直流输出接口；The input end of the AC/DC converter is connected to the AC power interface, and the output end of the AC/DC converter is connected to the DC output interface;
所述AC/DC变换器的输出端通过第一开关连接所述第一供电接口，用于向第一供电接口供电；The output terminal of the AC/DC converter is connected to the first power supply interface through a first switch, and is used to supply power to the first power supply interface;
所述第一单向隔离元件连接在第一供电接口与AC/DC变换器的输出端之间，用于隔离AC/DC变换器向第一供电接口输出的电流；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 to isolate the current output by the AC/DC converter to the first power supply interface;
所述第二单向隔离元件连接在第二供电接口与AC/DC变换器的输出端之间，用于隔离AC/DC变换器向第二供电接口输出的电流；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 to isolate the current output by the AC/DC converter to the second power supply interface;
所述第一供电接口通过第一DC/DC变换器连接第二供电接口，第一DC/DC变换器用于控制第一供电接口向第二供电接口的充电过程；The first power supply interface is connected to the second power supply interface through a first DC/DC converter, and the first DC/DC converter is used to control the charging process from the first power supply interface to the second power supply interface;
所述第二供电接口通过第二DC/DC变换器连接第一供电接口，第二DC/DC变换器用于控制第二供电接口向第一供电接口的充电过程。The second power supply interface is connected to the first power supply interface through a second DC/DC converter, and the second DC/DC converter is used to control the charging process from the second power supply interface to the first power supply interface.
本发明通过在直流电源系统中AC/DC变换器与直流输出接口之间设置两个供电接口以及对应的充放电组合电路，并通过充放电组合电路中在供电接口之间设置对应的第一DC/DC变换器和第二DC/DC变换器，以及连接第一、二供电接口的开关、单向隔离元件等，从而在控制AC/DC变换器进行输出电压调整的同时，结合两个供电接口所连接的供电设备的电能转移过程，使得AC/DC变换器的允许波动与其他供电元件相互配合，实现对供能输出的精细控制。同时，系统中的两个供电接口所连接的供电设备可并行运行以增加直流电源系统的储能容量。In the present invention, two power supply interfaces and corresponding charging and discharging combination circuits are set between the AC/DC converter and the DC output interface in the DC power supply system, and the corresponding first DC is set between the power supply interfaces in the charging and discharging combination circuit. /DC converter and the second DC/DC converter, as well as switches connected to the first and second power supply interfaces, unidirectional isolation elements, etc., so as to combine the two power supply interfaces while controlling the AC/DC converter to adjust the output voltage The power transfer process of the connected power supply equipment makes the allowable fluctuation of the AC/DC converter cooperate with other power supply components to achieve fine control of the power supply output. At the same time, the power supply equipment connected to the two power supply interfaces in the system can run in parallel to increase the energy storage capacity of the DC power supply system.
进一步的，所述直流电源电路包括控制器，所述控制器采样AC/DC输出端的电压、AC/DC输出端的电流、流过第一开关的电流、流过第一单向隔离元件的电流、流过第二单向隔离元件的电流、第一供电接口的电压和第二供电接口的电压；所述控制器控制连接所述AC/DC变换器、第一开关、第一DC/DC变换器和第二DC/DC变换器。Further, the DC power supply circuit includes a controller, and the controller samples the voltage at the AC/DC output terminal, the current at the AC/DC output terminal, the current flowing through the first switch, the current flowing through the first unidirectional isolation element, The current flowing through the second unidirectional isolation element, the voltage of the first power supply interface and the voltage of the second power supply interface; the controller controls the connection of the AC/DC converter, the first switch, and the first DC/DC converter and a second DC/DC converter.
进一步的，所述AC/DC变换器的输出端还连接有第三单向隔离元件。Further, the output end of the AC/DC converter is further connected with a third unidirectional isolation element.
进一步的，所述第一DC/DC变换器和第二DC/DC变换器为boost升压变换器。Further, the first DC/DC converter and the second DC/DC converter are boost converters.
进一步的，所述第一单向隔离元件、第二单向隔离元件和第三单向隔离元件为二极管；所述第一开关为MOS开关管。Further, the first unidirectional isolation element, the second unidirectional isolation element and the third unidirectional isolation element are diodes; the first switch is a MOS switch.
附图说明Description of drawings
图1是本发明直流电源系统实施例中的直流电源系统结构图；Fig. 1 is the structural diagram of the DC power supply system in the embodiment of the DC power supply system of the present invention;
图2是本发明直流电源系统实施例中的直流电源系统原理图。Fig. 2 is a schematic diagram of the DC power system in the embodiment of the DC power system of the present invention.
具体实施方式Detailed ways
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明，即所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本发明实施例的组件可以以各种不同的配置来布置和设计。In order to make the object, technical solution and advantages of the present invention clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention, that is, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.
因此，以下对在附图中提供的本发明的实施例的详细描述并非旨在限制要求保护的本发明的范围，而是仅仅表示本发明的选定实施例。基于本发明的实施例，本领域技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
需要说明的是，术语“第一”和“第二”等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。It should be noted that relative terms such as the terms "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.
以下结合实施例对本发明的特征和性能作进一步的详细描述。The characteristics and performance of the present invention will be described in further detail below in conjunction with the examples.
直流电源系统实施例：Example of a DC power supply system:
本实施例中直流电源系统的组成框图如图1所示，包括交流电源和直流电源电路。直流电源电路包括：AC/DC变换器、充放电组合电路、与第一电池组(以下简称电池组1)对应的第一供电接口、与第二电池组(以下简称电池组2)对应的第二供电接口、控制器以及用于连接用电设备的直流输出接口。AC/DC变换器完成交流到直流的变换以及对电池组1的充电功能，充放电组合电路完成电池组对外的充放电和电池之间的充电放电功能，电池组1和电池组2用于交替轮流充放电和储能，控制器完成系统和电池状态检测以及根据系统和电池状态控制系统的高质量输出和电池的综合性能优化。The composition block diagram of the DC power supply system in this embodiment is shown in FIG. 1 , including an AC power supply and a DC power supply circuit. The DC power supply circuit includes: an AC/DC converter, a charging and discharging combination circuit, a first power supply interface corresponding to the first battery pack (hereinafter referred to as battery pack 1), and a first power supply interface corresponding to the second battery pack (hereinafter referred to as battery pack 2). 2. A power supply interface, a controller, and a DC output interface for connecting electrical equipment. The AC/DC converter completes the conversion from AC to DC and charges the battery pack 1. The charging and discharging combination circuit completes the external charging and discharging of the battery pack and the charging and discharging function between the batteries. The battery pack 1 and the
如图2所示，本实施例给出了直流电源系统中充放电组合电路的具体电路组成：第一DC/DC变换器、第二DC/DC变换器、第一开关、第一单向隔离元件和第二单向隔离元件；所述AC/DC变换器的输入端连接交流电源接口，AC/DC变换器的输出端连接直流输出接口；AC/DC变换器的输出端通过第一开关连接所述第一供电接口，用于向第一供电接口供电；所述第一单向隔离元件的一端连接第一供电接口，另一端连接在AC/DC变换器的输出端，用于隔离AC/DC变换器向第一供电接口输出的电流；所述第二单向隔离元件的一端连接第二供电接口，另一端连接在AC/DC变换器的输出端，用于隔离AC/DC变换器向第二供电接口输出的电流；所述第一供电接口通过第一DC/DC变换器连接第二供电接口，从而通过第一DC/DC变换器控制第一供电接口向第二供电接口的充电过程；所述第二供电接口通过第二DC/DC变换器连接第一供电接口，从而通过第二DC/DC变换器控制第二供电接口向第一供电接口的充电过程。As shown in Figure 2, this embodiment provides the specific circuit composition of the charging and discharging combination circuit in the DC power system: the first DC/DC converter, the second DC/DC converter, the first switch, the first unidirectional isolation element and a second unidirectional isolation element; the input end of the AC/DC converter is connected to the AC power interface, and the output end of the AC/DC converter is connected to the DC output interface; the output end of the AC/DC converter is connected through the first switch The first power supply interface is used to supply power to the first power supply interface; one end of the first unidirectional isolation element is connected to the first power supply interface, and the other end is connected to the output end of the AC/DC converter for isolating AC/DC The current output by the DC converter to the first power supply interface; one end of the second unidirectional isolation element is connected to the second power supply interface, and the other end is connected to the output end of the AC/DC converter for isolating the AC/DC converter to the first power supply interface. The current output by the second power supply interface; the first power supply interface is connected to the second power supply interface through the first DC/DC converter, thereby controlling the charging process from the first power supply interface to the second power supply interface through the first DC/DC converter ; The second power supply interface is connected to the first power supply interface through the second DC/DC converter, so as to control the charging process from the second power supply interface to the first power supply interface through the second DC/DC converter.
具体的，本实施例中，所述的DC/DC变换器通过boost升压变换器实现，如图2所示，作为其他实施方式，也可以采用其他形式的变换器实现，例如桥式DC/DC电路等。Specifically, in this embodiment, the DC/DC converter described above is realized by a boost converter, as shown in FIG. DC circuits, etc.
Q1、Q3、L1、D3组成的第一DC/DC变换器构成电池组1向电池组2的电能转移通道，用于电池组1向电池组2放电。当Q3导通时启动电池组1向电池组2的电能转移，Q1导通时，电池组1的电能存于电感L1，Q1关断时，电感L1中的能量存于电池组2。The first DC/DC converter composed of Q1, Q3, L1, and D3 constitutes an electric energy transfer channel from the battery pack 1 to the
Q2、Q4、L2、D4组成的第二DC/DC变换器构成电池组2向电池组1的电能转移通道，用于电池组2向电池组1放电。当Q4导通时启动电池组2向电池组1的电能转移，Q2导通时，电池组2的电能存于电感L2，Q2关断时，电感L2中的能量存于电池组1。The second DC/DC converter composed of Q2, Q4, L2, and D4 constitutes the electric energy transfer channel from the
同时，AC/DC的输出端还连接有单向隔离元件D0，实现单向输出。电池组1和电池组2分别通过单相隔离二极管D1、D2向直流输出接口输出电能，从而有效的隔离AC/DC的输出端与相应的供能接口，并且，通过开关Q0控制AC/DC变换器是否向电池组1充电。At the same time, the output end of the AC/DC is also connected with a unidirectional isolation element D0 to realize unidirectional output. Battery pack 1 and
本实施例中，D0、D1、D2、D3为单向隔离二极管，Q0、Q1、Q2、Q3、Q4为MOS开关管，L1、L2为高频电感，rfz为用电设备等效负载。作为其他实施方式，本实施例中的第一隔离元件、第二隔离原件、第三隔离元件等还可以采用其他形式的具有单向隔离功能的设置。In this embodiment, D0, D1, D2, and D3 are unidirectional isolation diodes, Q0, Q1, Q2, Q3, and Q4 are MOS switch tubes, L1, L2 are high-frequency inductors, and r fz is the equivalent load of electrical equipment. As other implementation manners, the first isolating element, the second isolating element, the third isolating element, etc. in this embodiment may also adopt other forms of configurations with a one-way isolating function.
图2中给出了本实施例中的电压极性、电流和控制信号流向。控制器采样AC/DC输出端的电压、电流，流过第一开关的电流，流过第一单向隔离元件的电流，流过第二单向隔离元件的电流，第一供电接口的电压和第二供电接口的电压；控制器控制连接所述AC/DC变换器、第一开关、第一DC/DC变换器和第二DC/DC变换器。Figure 2 shows the voltage polarity, current and control signal flow in this embodiment. The controller samples the voltage and current of the AC/DC output terminal, the current flowing through the first switch, the current flowing through the first unidirectional isolation element, the current flowing through the second unidirectional isolation element, the voltage of the first power supply interface and the second 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.
具体的，AC/DC变换器完成交流到直流的变换、给用电设备、给电池组1充电的功能，其直流输出电压uo0受外控电压信号ug的控制，经单向隔离二极管D0后作为直流电源系统的输出电压uo。Specifically, the AC/DC converter completes the conversion from AC to DC, and charges the electrical equipment and the battery pack 1. Its DC output voltage u o0 is controlled by the external control voltage signal u g , and is passed through the one-way isolation diode D0 Afterwards, it is used as the output voltage u o of the DC power supply system.
MOS开关管Q0控制AC/DC变换器是否向电池组充电，当Q0导通时AC/DC变换器向电池组充电，当Q0关断时AC/DC变换器停止向电池组充电。The MOS switch tube Q0 controls whether the AC/DC converter charges the battery pack. When Q0 is turned on, the AC/DC converter charges the battery pack. When Q0 is turned off, the AC/DC converter stops charging the battery pack.
单向隔离二极管D1、D2完成电池组是否向直流电源系统输出电能的自然切换，当直流电源系统输出电压uo高于电池组1端电压uo1和电池组2端电压uo2时，电池组不向直流电源系统输出电能；当直流电源系统输出电压uo低于电池组1端电压uo1或电池组2端电压uo2时，电池组向直流电源系统输出电能。The one-way isolation diodes D1 and D2 complete the natural switching of whether the battery pack outputs electric energy to the DC power system. When the output voltage u o of the DC power system is higher than the voltage u o1 of the battery pack 1 terminal and the voltage u o2 of the
图2中，“～uin”为交流输入电压，“uo0”为AC/DC变换器的直流输出电压，“io0”为AC/DC变换器的输出电流，“uo”为直流电源系统的直流输出电压，“uo1”为电池组1的端电压，“ic”为电池组1的充电电流，“io1”为电池组1向直流电源系统的供电电流，“i12”为电池组1向电池组2的放电电流，“uo2”为电池组2的端电压，“io2”为电池组2向直流电源系统的供电电流，“i21”为电池组2向电池组1的放电电流，“ifz”为提供给用电设备的负载电流，“s0”为MOS管Q0的控制信号，“s1”为MOS管Q1的控制信号，“s2”为MOS管Q2的控制信号，“s3”为MOS管Q3的控制信号，“s4”为MOS管Q4的控制信号，“ug”为控制器给AC/DC变换器的控制电压信号。In Figure 2, "~u in " is the 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, and "u o " is the DC power supply The DC output voltage of the system, “u o1 ” is the terminal voltage of the battery pack 1, “ ic ” is the charging current of the battery pack 1, “i o1 ” is the supply current of the battery pack 1 to the DC power supply system, and “i 12 ” is the discharge current from battery pack 1 to battery pack 2, “u o2 ” is the terminal voltage of battery pack 2, “i o2 ” is the supply current from battery pack 2 to the DC power system, and “i 21 ” is the supply current from battery pack 2 to the battery The discharge current of group 1, " ifz " is the load current provided to the electrical equipment, "s0" is the control signal of MOS transistor Q0, "s1" is the control signal of MOS transistor Q1, and "s2" is the control signal of MOS transistor Q2 Control signal, "s3" is the control signal of MOS transistor Q3, "s4" is the control signal of MOS transistor Q4, and " ug " is the control voltage signal of the controller to the AC/DC converter.
本实施例中还包括辅助电源，辅助电源以通用的单端反激电源电路产生多路直流输出电压，分别为AC/DC变换器和检测与控制器提供工作电源输入，图2中“Vcc2”为AC/DC变换器的工作电源输入，“Vcc1”为检测与控制器的工作电源输入。In this embodiment, an auxiliary power supply is also included. The auxiliary power supply uses a general single-ended flyback power supply circuit to generate multiple DC output voltages, and provides working power input for the AC/DC converter and the detection and controller respectively. "Vcc2" in Fig. 2 It is the working power input of the AC/DC converter, and "Vcc1" is the working power input of the detection and controller.
控制器用数字控制电路检测直流电源系统及电池的各输出状态量、估计电池状态和参数、确定AC/DC变换器和电池组的期望工作状态、产生控制信号控制AC/DC变换器和电池组的实际工作状态分别趋于各自的期望状态。The controller uses a digital control circuit to detect the output state quantities of the DC power supply system and the battery, estimate the battery state and parameters, determine the expected working state of the AC/DC converter and the battery pack, and generate control signals to control the AC/DC converter and the battery pack. The actual working state tends to the respective desired state respectively.
作为其他实施方式，本实施例中连接第一供电接口、第二供电接口的供电设备并不局限于电池组，也可以是其他设备，例如储能电容等其他类型的储能原件。而电池组可以是锂电池、铅酸电池等可充电电池。As other implementation manners, the power supply equipment connected to the first power supply interface and the second power supply interface in this embodiment is not limited to a battery pack, and may also be other equipment, such as other types of energy storage elements such as energy storage capacitors. The battery pack can be rechargeable batteries such as lithium batteries and lead-acid batteries.
直流电源电路实施例：Example of a DC power supply circuit:
本实施例中提供了一种直流电源电路结构，包括交流电源接口、AC/DC变换器、直流输出接口、第一供电接口、第二供电接口和充放电组合电路；所述充放电组合电路包括第一DC/DC变换器、第二DC/DC变换器、第一开关、第一单向隔离元件和第二单向隔离元件；This embodiment provides a DC power circuit structure, including an AC power interface, an AC/DC converter, a DC output interface, a first power supply interface, a second power supply interface, and a charge-discharge combination circuit; the charge-discharge combination circuit includes a first DC/DC converter, a second DC/DC converter, a first switch, a first unidirectional isolation element, and a second unidirectional isolation element;
所述AC/DC变换器的输入端连接交流电源接口，输出端连接直流输出接口；The input end of the AC/DC converter is connected to the AC power interface, and the output end is connected to the DC output interface;
所述AC/DC变换器的输出端通过第一开关连接所述第一供电接口，用于向第一供电接口供电；The output terminal of the AC/DC converter is connected to the first power supply interface through a first switch, and is used to supply power to the first power supply interface;
所述第一单向隔离元件的一端连接第一供电接口，另一端连接在AC/DC变换器与直流输出接口之间，用于隔离第一供电接口和AC/DC变换器的输出端；One end of the first unidirectional isolation element is connected to the first power supply interface, and the other end is connected between the AC/DC converter and the DC output interface for isolating the first power supply interface and the output end of the AC/DC converter;
所述第二单向隔离元件的一端连接第二供电接口，另一端连接在AC/DC变换器与直流输出接口之间，用于隔离第二供电接口和AC/DC变换器的输出端；One end of the second unidirectional isolation element is connected to the second power supply interface, and the other end is connected between the AC/DC converter and the DC output interface for isolating the second power supply interface and the output end of the AC/DC converter;
所述第一供电接口通过第一DC/DC变换器连接第二供电接口；The first power supply interface is connected to the second power supply interface through a first DC/DC converter;
所述第二供电接口通过第二DC/DC变换器连接第一供电接口。The second power supply interface is connected to the first power supply interface through a second DC/DC converter.
本实施例中给出的直流电源电路即为上述直流电源系统中的直流电源电路，具体的电源电路的连接关系以及组成原理已在上述直流电源系统实施例中详细说明，此处不再赘述。The DC power supply circuit given in this embodiment is the DC power supply circuit in the above-mentioned DC power supply system. The specific connection relationship and composition principle of the power supply circuit have been described in detail in the above-mentioned DC power supply system embodiment and will not be repeated here.
以上所述，仅为本发明的较佳实施例，并不用以限制本发明，本发明的专利保护范围以权利要求书为准，凡是运用本发明的说明书及附图内容所作的等同结构变化，同理均应包含在本发明的保护范围内。The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. Any equivalent structural changes made by using the description and accompanying drawings of the present invention, All should be included in the protection scope of the present invention in the same way.
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