CN108988644A - A kind of DC/DC converter topology structure - Google Patents
A kind of DC/DC converter topology structure Download PDFInfo
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- CN108988644A CN108988644A CN201810637386.5A CN201810637386A CN108988644A CN 108988644 A CN108988644 A CN 108988644A CN 201810637386 A CN201810637386 A CN 201810637386A CN 108988644 A CN108988644 A CN 108988644A
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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
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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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
- H02M1/0083—Converters characterised by their input or output configuration
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Abstract
本发明属于电网控制电路拓扑结构领域，尤其涉及一种DC/DC变换器拓扑结构。本发明中的DC/DC变换器拓扑结构，其各个电源能够单独或者同时与负载或者电网之间传递或者接收电能，实现能量灵活的双向流动管理，三绕组高频耦合变压器实现了电气隔离，同时可根据前后端电压配比关系快速定型设计其匝数比，简化电路及设备设计复杂度，利用开关管的并联电容以及变压器漏感实现谐振与能量转换，在不借助外设辅助电路的情况下实现软开关，有利于简化电路结构，降低电路成本，同时能够满足不同功率下能量转换需求，提高了变换器的应用范围。
The invention belongs to the field of power grid control circuit topology, in particular to a DC/DC converter topology. In the topology of the DC/DC converter in the present invention, each power supply can transmit or receive electric energy with the load or the power grid independently or simultaneously, so as to realize flexible bidirectional flow management of energy, and the three-winding high-frequency coupling transformer realizes electrical isolation, and at the same time The turns ratio can be quickly finalized and designed according to the relationship between the front and rear voltage ratios, the complexity of circuit and equipment design can be simplified, and the parallel capacitance of the switch tube and the leakage inductance of the transformer can be used to realize resonance and energy conversion without the aid of peripheral auxiliary circuits. The realization of soft switching is conducive to simplifying the circuit structure and reducing the cost of the circuit, and at the same time, it can meet the energy conversion requirements under different powers and improve the application range of the converter.
Description
技术领域technical field
本发明属于电网控制电路拓扑结构领域，尤其涉及一种DC/DC变换器拓扑结构。The invention belongs to the field of power grid control circuit topology, in particular to a DC/DC converter topology.
背景技术Background technique
随着社会经济的不断发展，人们电能的需求越来越高，受能源危机以及环境问题的限制，人们开始大力发展各种可再生清洁能源，包括风力、水力、太阳能以及生物质能、地热能、潮汐能等，其中风力以及太阳能资源较为丰富，对环境友好，且资源分布广泛，是最常见的两种清洁能源。但同时，这些可再生能源大多数不能持续稳定输出，例如太阳能、风能、潮汐能收到环境因素的限制其输出间歇且不确定，这导致这些不稳定的电能在输入电网过程中给电力系统带来运行和控制的不稳定性。受可再生能源输出功率的随机性影响，电网电压的频率、电能特性等无法准确控制，容易引起电网性能下降，电力系统维护难度增加。电力调度控制效果下降等问题，因此需要各类变换器实现不同能量之间的耦合转换，在将各种可再生能源等独立电源中的电能引入电网的同时，降低这些电源对电网的不利影响。但现有变换器存在结构复杂、难以有效实现电气隔离、难以满足高压负载以及不易实现软开关等问题。With the continuous development of social economy, people's demand for electric energy is getting higher and higher. Restricted by the energy crisis and environmental problems, people have begun to vigorously develop various renewable and clean energy sources, including wind power, water power, solar energy, biomass energy, and geothermal energy. , tidal energy, etc. Among them, wind power and solar energy are rich in resources, friendly to the environment, and the resources are widely distributed. They are the two most common clean energy sources. But at the same time, most of these renewable energy sources cannot sustain stable output. For example, solar energy, wind energy, and tidal energy are limited by environmental factors, and their output is intermittent and uncertain, which causes these unstable electric energies to be brought to the power system during the process of inputting into the grid. to run and control instability. Affected by the randomness of the output power of renewable energy, the frequency and power characteristics of the grid voltage cannot be accurately controlled, which will easily cause the performance of the grid to decline and increase the difficulty of power system maintenance. For problems such as the decline in the effect of power dispatching control, various converters are required to realize the coupling conversion between different energies, and reduce the adverse impact of these power sources on the grid while introducing the electric energy from various renewable energy and other independent power sources into the grid. However, existing converters have problems such as complex structure, difficulty in effectively realizing electrical isolation, difficulty in meeting high-voltage loads, and difficulty in realizing soft switching.
发明内容Contents of the invention
本发明创造的目的在于，提供一种DC/DC变换器拓扑结构，以求简化电路结构，降低电路成本，满足不同功率下能量转换需求，提高变换器的应用范围。The purpose of the present invention is to provide a DC/DC converter topology in order to simplify the circuit structure, reduce circuit cost, meet energy conversion requirements under different power levels, and increase the application range of the converter.
为实现上述目的，本发明创造采用如下技术方案。In order to achieve the above object, the present invention adopts the following technical solutions.
一种DC/DC变换器拓扑结构，包括第一输入变换单元、第二输入变换单元以及输出变换单元，两个输入变换单元和输出变换单元之间设置有三绕组高频耦合变压器作为能量传输元件，两个输入变换单元和输出变换单元分别设置于三饶子高频耦合变压器两侧；A DC/DC converter topology, including a first input conversion unit, a second input conversion unit, and an output conversion unit, a three-winding high-frequency coupling transformer is arranged between the two input conversion units and the output conversion unit as an energy transmission element, Two input transformation units and output transformation units are respectively arranged on both sides of the Sanraozi high-frequency coupling transformer;
第一输入变换单元为电压型全桥结构，包括第一电源，第一电源的输出端串联有第一电感，第一电源和第一电感的两端并联有第一电容，第一电容与由四个开关管组成的第一双向全桥结构并联，双向全桥中两个半桥的中间点相连后接入三绕组高频耦合变压器；The first input conversion unit is a voltage-type full-bridge structure, including a first power supply, a first inductor connected in series at the output end of the first power supply, and a first capacitor connected in parallel between the first power supply and the first inductor, and the first capacitor and the first capacitor are connected in parallel. The first bidirectional full-bridge structure composed of four switching tubes is connected in parallel, and the middle points of the two half-bridges in the bidirectional full bridge are connected to a three-winding high-frequency coupling transformer;
第二输入变换单元为电压型全桥结构，包括由超级电容构成的第二电源，第二电源的输出端串联有第二电感，第二电源和第二电感的两端并联有第二电容，第二电容与由四个开关管组成的第二双向全桥结构并联，双向全桥中两个半桥的中间点相连后接入三绕组高频耦合变压器；第一双向全桥和第二双向全桥中的每一个开关管均工作在额定功率下，且每一个开关管的两端均跨接有飞跨电容以及钳位二极管；The second input conversion unit is a voltage-type full-bridge structure, including a second power supply composed of supercapacitors, a second inductor connected in series at the output end of the second power supply, and a second capacitor connected in parallel between the second power supply and the second inductor. The second capacitor is connected in parallel with the second bidirectional full bridge structure composed of four switching tubes, and the middle point of the two half bridges in the bidirectional full bridge is connected to a three-winding high frequency coupling transformer; the first bidirectional full bridge and the second bidirectional full bridge Each switching tube in the full bridge works at rated power, and a flying capacitor and a clamping diode are connected across both ends of each switching tube;
输出变换单元包括第三双向全桥，第三双向全桥的两个半桥的中间点相连后接入三绕组高频耦合变压器以输出电能，第三双向全桥的两端连接至直流系统或者交流系统。The output transformation unit includes a third bidirectional full bridge, the middle points of the two half bridges of the third bidirectional full bridge are connected to a three-winding high-frequency coupling transformer to output electric energy, and both ends of the third bidirectional full bridge are connected to a DC system or AC system.
进一步的，第一电源由蓄电池串联组成。Further, the first power supply is composed of batteries connected in series.
进一步的，直流系统是指直流母线或者直流负载或者直流微网；交流系统包括逆变器，还包括交流母线或者交流微网或者交流负载。Further, the DC system refers to a DC bus or a DC load or a DC microgrid; the AC system includes an inverter, and also includes an AC bus or an AC microgrid or an AC load.
进一步的，开关管并联的钳位二极管为与之相应的寄生二极管。Further, the clamping diodes connected in parallel with the switch tubes are corresponding parasitic diodes.
其有益效果在于：在该DC/DC变换器工作在正向模式时，由蓄电池和超级电容向输出端供电，同时蓄电池向超级电容充电；在该DC/DC变换器工作在反向模式时，电网则向蓄电池以及超级电容提供电能，同时蓄电池向超级电容充电。在该DC/DC变换器拓扑结构中，假设其中一侧如蓄电池停止工作，则该拓扑结构成为双端口变换器，只有超级电容和负载之间进行电能转换，此时该双端口变换器可实现三种不同工作模式，包括内部模式、超前外部模式、滞后外部模式；因此本发明该DC/DC变换器可拆分为三个互相耦合的双全桥变换器，通过对本发明中超级电容侧占空比与相位角进行控制，能够实现前述三种不同工作模式的结合。通过耦合变压器和负载电网进行能量转换传递，储能系统通过基础的电压控制使输出侧在负载的变化情况依旧能保持电压稳定，通过对蓄电池以及超级电容进行充放电过程进行状态管理，实现对储能元件的保护，通过电流控制使得输入电流保持连续，基于本发明中的DC/DC变换器拓扑结构，其各个电源能够单独或者同时与负载或者电网之间传递或者接收电能，实现能量灵活的双向流动管理，三绕组高频耦合变压器实现了电气隔离，同时可根据前后端电压配比关系快速定型设计其匝数比，简化电路及设备设计复杂度，利用开关管的并联电容以及变压器漏感实现谐振与能量转换，在不借助外设辅助电路的情况下实现软开关，有利于简化电路结构，降低电路成本，同时能够满足不同功率下能量转换需求，提高了变换器的应用范围。The beneficial effect is that: when the DC/DC converter works in the forward mode, the battery and the supercapacitor supply power to the output terminal, and at the same time the battery charges the supercapacitor; when the DC/DC converter works in the reverse mode, The grid supplies electric energy to the battery and the supercapacitor, and the battery charges the supercapacitor at the same time. In this DC/DC converter topology, assuming that one side, such as the battery, stops working, the topology becomes a two-port converter, and only the supercapacitor and the load perform power conversion. At this time, the two-port converter can realize Three different operating modes, including internal mode, leading external mode, and lagging external mode; therefore, the DC/DC converter of the present invention can be split into three mutually coupled double full-bridge converters, by supercapacitor side in the present invention. Controlling the ratio and phase angle can realize the combination of the aforementioned three different working modes. Through the coupling transformer and the load grid for energy conversion and transmission, the energy storage system can maintain the voltage stability of the output side under the change of the load through the basic voltage control. The protection of energy components, the input current is kept continuous through current control, based on the topology of the DC/DC converter in the present invention, each power supply can transmit or receive electric energy with the load or the grid independently or at the same time, realizing energy flexible two-way Flow management, the three-winding high-frequency coupling transformer realizes electrical isolation, and at the same time, the turns ratio can be quickly finalized and designed according to the ratio relationship between the front and rear end voltages, simplifying the complexity of circuit and equipment design, and using the parallel capacitance of the switch tube and the leakage inductance of the transformer to realize Resonance and energy conversion realize soft switching without the help of peripheral auxiliary circuits, which is conducive to simplifying the circuit structure and reducing circuit costs. At the same time, it can meet the energy conversion requirements under different power levels and improve the application range of the converter.
附图说明Description of drawings
图1是本发明一种DC/DC变换器拓扑结构的示意图；Fig. 1 is the schematic diagram of a kind of DC/DC converter topological structure of the present invention;
图2是三绕组高频耦合变压器的等效模型以及简化结构图；Figure 2 is the equivalent model and simplified structure diagram of the three-winding high-frequency coupling transformer;
图3是本发明DC/DC变换器拓扑结构等效电路图；Fig. 3 is the equivalent circuit diagram of the topological structure of the DC/DC converter of the present invention;
图4是本发明DC/DC变换器在一个周期内的电压电流波形图。Fig. 4 is a waveform diagram of voltage and current in one cycle of the DC/DC converter of the present invention.
具体实施方式Detailed ways
以下结合具体实施例对本发明创造作详细说明。The invention will be described in detail below in conjunction with specific embodiments.
如图1所示，一种DC/DC变换器拓扑结构，包括第一输入变换单元、第二输入变换单元以及一个输出变换单元，两个输入变换单元和一个输出变换单元之间设置有三绕组高频耦合变压器作为能量传输元件，两个输入变换单元和输出变换单元分别设置于三饶子高频耦合变压器两侧。As shown in Figure 1, a DC/DC converter topology includes a first input conversion unit, a second input conversion unit, and an output conversion unit, and a three-winding high A frequency coupling transformer is used as an energy transmission element, and two input conversion units and an output conversion unit are respectively arranged on both sides of the Sanraozi high frequency coupling transformer.
第一输入变换单元为电压型全桥结构，包括由蓄电池串联组成的第一电源，第一电源的输出端串联有第一电感，第一电源和第一电感的两端并联有第一电容，第一电容与由四个开关管组成的第一双向全桥结构并联，双向全桥中两个半桥的中间点相连后接入三绕组高频耦合变压器；第二输入变换单元为电压型全桥结构，包括由超级电容构成的第二电源，第二电源的输出端串联有第二电感，第二电源和第二电感的两端并联有第二电容，第二电容与由四个开关管组成的第二双向全桥结构并联，双向全桥中两个半桥的中间点相连后接入三绕组高频耦合变压器；第一双向全桥和第二双向全桥中的每一个开关管均工作在额定功率下，且每一个开关管的两端均跨接有飞跨电容以及钳位二极管。The first input conversion unit is a voltage-type full-bridge structure, including a first power supply composed of batteries connected in series, a first inductor connected in series at the output end of the first power supply, and a first capacitor connected in parallel between the first power supply and the first inductor. The first capacitor is connected in parallel with the first bidirectional full bridge structure composed of four switching tubes, and the middle point of the two half bridges in the bidirectional full bridge is connected to a three-winding high frequency coupling transformer; the second input conversion unit is a voltage type full bridge The bridge structure includes a second power supply composed of a supercapacitor, a second inductance is connected in series at the output end of the second power supply, a second capacitor is connected in parallel between the second power supply and the second inductance, and the second capacitor is connected to four switching tubes. The second bidirectional full bridge structure is connected in parallel, and the middle points of the two half bridges in the bidirectional full bridge are connected to a three-winding high-frequency coupling transformer; each switch tube in the first bidirectional full bridge and the second bidirectional full bridge is Working at the rated power, and the two ends of each switching tube are connected across a flying capacitor and a clamping diode.
输出变换单元包括第三双向全桥，第三双向全桥的两个半桥的中间点相连后接入三绕组高频耦合变压器以输出电能，第三双向全桥的两端连接至直流系统或者交流系统；The output transformation unit includes a third bidirectional full bridge, the middle points of the two half bridges of the third bidirectional full bridge are connected to a three-winding high-frequency coupling transformer to output electric energy, and both ends of the third bidirectional full bridge are connected to a DC system or communication system;
在该DC/DC变换器拓扑结构中，三绕组高频耦合变压器的等效模型以及简化结构如图2所示，通过该结构储能设备(包括蓄电池以及超级电容)与输出端之间实现电气隔离，同时通过磁耦合的方式使电源与负载相互连接，通过绕组间的变比实现低压电源和高压输出之间的电压匹配，一方面变压器绕组的漏感实现能量传递，另一方面还将其作为谐振软开关元件，提高了系统效率，其中Lm1和Lm2为变压器的等效激励电感，Lr1、Lr2以及Lr3分别为变压器个绕组之间的漏感，基于上述基础，对变压器进行等效电路简化后，该DC/DC 变换器拓扑结构等效为图3所示的电路，其中ir1、ir2以及ir3分别表示变换器各端口对应的三绕组漏电流，vr1、vr2以及vr3则分别表示折算到高频变压器各原绕组和副绕组的电压。变换器通过变压器(图3中用Tr表示)的漏感来实现高、低压侧的电能转换。In this DC/DC converter topology, the equivalent model and simplified structure of the three-winding high-frequency coupling transformer are shown in Figure 2. Through this structure, the electrical At the same time, the power supply and the load are connected to each other through magnetic coupling, and the voltage matching between the low-voltage power supply and the high-voltage output is realized through the transformation ratio between the windings. On the one hand, the leakage inductance of the transformer winding realizes energy transfer; As a resonant soft switching element, the system efficiency is improved, where L m1 and L m2 are the equivalent excitation inductance of the transformer, and L r1 , L r2 and L r3 are the leakage inductance between the windings of the transformer respectively. Based on the above basis, the transformer After the equivalent circuit is simplified, the topology of the DC/DC converter is equivalent to the circuit shown in Figure 3, where i r1 , i r2 and i r3 represent the leakage currents of the three windings corresponding to each port of the converter, v r1 , v r2 and v r3 respectively represent the voltage converted to each primary winding and secondary winding of the high-frequency transformer. The converter uses the leakage inductance of the transformer (shown by T r in Fig. 3) to realize the electric energy conversion of the high and low voltage sides.
分析上述结构可知，在微电网储能结构中，该DC/DC变换器工作在正向模式时，由蓄电池和超级电容向输出端供电，同时蓄电池向超级电容充电；在该DC/DC变换器工作在反向模式时，电网则向蓄电池以及超级电容提供电能，同时蓄电池向超级电容充电。在该DC/DC变换器拓扑结构中，假设其中一侧如蓄电池停止工作，则该拓扑结构成为双端口变换器，只有超级电容和负载之间进行电能转换，此时该双端口变换器可实现三种不同工作模式，包括内部模式、超前外部模式、滞后外部模式；因此本发明该DC/DC变换器可拆分为三个互相耦合的双全桥变换器，通过对本发明中超级电容侧占空比与相位角进行控制，能够实现前述三种不同工作模式的结合。Analysis of the above structure shows that in the microgrid energy storage structure, when the DC/DC converter works in the forward mode, the battery and the supercapacitor supply power to the output terminal, and the battery charges the supercapacitor at the same time; in the DC/DC converter When working in the reverse mode, the grid provides electric energy to the battery and the supercapacitor, and the battery charges the supercapacitor at the same time. In this DC/DC converter topology, assuming that one side, such as the battery, stops working, the topology becomes a two-port converter, and only the supercapacitor and the load perform power conversion. At this time, the two-port converter can realize Three different operating modes, including internal mode, leading external mode, and lagging external mode; therefore, the DC/DC converter of the present invention can be split into three mutually coupled double full-bridge converters, by supercapacitor side in the present invention. Controlling the ratio and phase angle can realize the combination of the aforementioned three different working modes.
进一步地，直流系统是指直流母线或者直流负载或者直流微网；交流系统包括逆变器，还包括交流母线或者交流微网或者交流负载。Further, the DC system refers to a DC bus or a DC load or a DC microgrid; the AC system includes an inverter, and also includes an AC bus or an AC microgrid or an AC load.
进一步地，开关管并联的钳位二极管为与之相应的寄生二极管Further, the clamping diode connected in parallel with the switching tube is the corresponding parasitic diode
其具体实施方式如下。Its specific implementation is as follows.
对本方案中的DC/DC变换器的工作原理进行分析，以图3中等效电路图的原边为参考，本发明中DC/DC变换器在一个周期内的电压电流波形如图4所示，变换器在一个周期内重复上述工作模式，因此在一个工作周期内其可以分为t1-t20二十个状态区间，包括：The working principle of the DC/DC converter in this program is analyzed, and with reference to the original side of the equivalent circuit diagram in Figure 3, the voltage and current waveforms of the DC/DC converter in one cycle in the present invention are as shown in Figure 4, transforming The device repeats the above working mode in one cycle, so it can be divided into t 1 -t 20 state intervals in one working cycle, including:
t0-t1(t0是指周期起始时间点)，该状态紧接上一稳定状态的t20，S1、S4、S5、S8导通，D9、D12导通。vcr6＝vcr7＝U2，三端所加电压均为正电压，v2侧占空比小于1，ir1线性降低，ir2和ir3线性增加。t 0 -t 1 (t 0 refers to the start time point of the cycle), this state is immediately after t 20 of the previous stable state, S 1 , S 4 , S 5 , S 8 are turned on, D 9 , D 12 are turned on . v cr6 ＝v cr7 ＝U 2 , the voltages applied to the three terminals are all positive voltages, the duty ratio of the v 2 side is less than 1, i r1 decreases linearly, and i r2 and i r3 increase linearly.
t1-t2，S5断开，Cr5、Cr6与Tr谐振，Cr5充能，Cr6放电，vcr5从0开始增加，vcr6从U2开始降低，其变化速度受t1时刻开关管电流大小影响，在t2时刻，Cr6由0开始变成负，D6正向导通，Cr5加至U2。t 1 -t 2 , S 5 is disconnected, C r5 , C r6 and T r resonate, C r5 is charged, C r6 is discharged, v cr5 increases from 0, v cr6 decreases from U 2 , and its changing speed is affected by t Influenced by the current of the switching tube at time 1 , at time t 2 , C r6 becomes negative from 0, D 6 conducts positively, and C r5 is added to U 2 .
t2-t3，t2时刻，D6导通，S6两端电压钳位为0。驱动S6实现零电压导通，该状态下v2＝0， ir2和ir3线性下降，ir1线性增加。t 2 -t 3 , at time t 2 , D 6 is turned on, and the voltage at both ends of S 6 is clamped to 0. Drive S 6 to achieve zero-voltage conduction. In this state, v 2 =0, i r2 and i r3 decrease linearly, and i r1 increases linearly.
t3-t4，t3在时刻，S1、S4断开，Cr1、Cr2、Cr5、Cr6与Tr谐振，Cr1和Cr4充电，Cr2和Cr3放电t 3 -t 4 , at time t 3 , S 1 and S 4 are disconnected, C r1 , C r2 , C r5 , C r6 resonate with T r , C r1 and C r4 charge, and C r2 and C r3 discharge
t5-t20时刻变化状态如图4所示；The state of change at time t 5 -t 20 is shown in Figure 4;
从图4中可知，本发明中的DC/DC变换器将蓄电池与超级电容连接在一起，通过耦合变压器和负载电网进行能量转换传递，储能系统通过基础的电压控制使输出侧在负载的变化情况依旧能保持电压稳定，通过对蓄电池以及超级电容进行充放电过程进行状态管理，实现对储能元件的保护，通过电流控制使得输入电流保持连续。It can be seen from Figure 4 that the DC/DC converter in the present invention connects the storage battery and the supercapacitor together, performs energy conversion and transfer through the coupling transformer and the load grid, and the energy storage system makes the output side change in load through basic voltage control The situation can still keep the voltage stable. Through the state management of the charging and discharging process of the battery and the super capacitor, the protection of the energy storage element is realized, and the input current is kept continuous through the current control.
基于本发明中的DC/DC变换器拓扑结构，其各个电源能够单独或者同时与负载或者电网之间传递或者接收电能，实现能量的可双向流动管理，三绕组高频耦合变压器实现了电气隔离，同时可根据前后端电压配比关系快速定型设计其匝数比，简化电路及设备设计复杂度，利用开关管的并联电容以及变压器漏感实现谐振与能量转换，在不借助外设辅助电路的情况下实现软开关，有利于简化电路结构，降低电路成本，同时能够满足不同功率下能量转换需求，提高了变换器的应用范围。Based on the topology of the DC/DC converter in the present invention, each power supply can transmit or receive electric energy with the load or the power grid independently or simultaneously to realize bidirectional flow management of energy, and the three-winding high-frequency coupling transformer realizes electrical isolation. At the same time, the turns ratio can be quickly finalized and designed according to the ratio of the front and rear end voltages, the complexity of the circuit and equipment design can be simplified, and the parallel capacitance of the switch tube and the leakage inductance of the transformer can be used to realize resonance and energy conversion without the aid of peripheral auxiliary circuits. Realizing soft switching under different power conditions is conducive to simplifying the circuit structure and reducing the circuit cost. At the same time, it can meet the energy conversion requirements under different power levels and improve the application range of the converter.
最后应当说明的是，以上实施例仅用以说明本发明创造的技术方案，而非对本发明创造保护范围的限制，尽管参照较佳实施例对本发明创造作了详细地说明，本领域的普通技术人员应当理解，可以对本发明创造的技术方案进行修改或者等同替换，而不脱离本发明创造技术方案的实质和范围。Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art Personnel should understand that the technical solution of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the present invention.
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