Full-bridge quick charging circuit of power type energy storage system and charger

Abstract

The invention discloses a full-bridge quick charging circuit of a power type energy storage system and a charger. The circuit comprises an inversion full-bridge module, a transformer module, a rectification full-bridge module, a first energy storage control module and a second energy storage control module. The input end of the inversion full-bridge module is connected with a DC power supply, and the output end is connected with the input end of the transformer module. The output end of the transformer module is connected with the input end of the rectification full-bridge module. The first output end of the rectification full-bridge module is connected with the first ends of the first and second energy storage control modules, the second output end is connected with the cathode of the power type energy storage system and the second end of the second energy storage control module, and the third output end is connected with the third end of the second energy storage control module. The second end of the first energy storage control module is connected with the fourth end of the second energy storage control module, and the third end is connected with the positive electrode of the power-type energy storage system. According to the circuit, the rising edge and the falling edge of the pulse current are adjusted through the energy storage capacitor, so that rapid conversion between a continuous current charging mode and a pulse current charging mode is realized.

Description

Technical Field

[0001] The present invention relates to the field of charging of power-type energy storage systems, and in particular to a full-bridge fast charging circuit and a charger for power-type energy storage systems. Background Art

[0002] Power-type energy storage systems (such as energy storage systems composed of one or more combinations of power-type energy storage devices such as electrochemical capacitors, power-type lithium-ion batteries, sodium-ion batteries, etc.) are a type of equipment that has the ability to store and quickly release large amounts of energy. They have high power density, can achieve efficient charging and discharging processes in a very short time, and have a long service life and low maintenance costs. Therefore, power-type energy storage systems are widely used in power systems and various energy storage scenarios that require high power output.

[0003] In existing technologies, power-based energy storage systems are primarily charged using traditional charging modes such as constant current charging, constant voltage charging, and constant power charging. While these charging methods can meet the basic charging requirements of power-based energy storage systems to a certain extent, they fail to fully tap into and utilize the unique high power density advantages of power-based energy storage systems, as well as their ability to withstand large pulse currents for rapid charging and discharging within a limited timeframe. Therefore, how to fully utilize the characteristics of power-based energy storage systems and develop efficient fast or ultra-fast charging technologies has become a pressing issue in the field of power-based energy storage system charging. Summary of the Invention

[0004] The present invention aims to provide a full-bridge fast charging circuit and charger for a power-type energy storage system. The circuit introduces a storage capacitor and utilizes the storage capacitor to regulate the rising and falling edges of the pulse current, thereby achieving rapid conversion of the circuit between a continuous current charging mode and a pulse current charging mode. This solves the problem in the prior art that the fast charging and discharging characteristics of power-type energy storage systems are not fully utilized.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention provides a full-bridge fast charging circuit for a power-type energy storage system, comprising:

[0007] An inverter full-bridge module, the input end of which is connected to a DC power supply;

[0008] A transformer module, whose input end is connected to the output end of the inverter full-bridge module, and whose output end is connected to the input end of the rectifier full-bridge module;

[0009] A rectifier full-bridge module, wherein a first output end is connected to the first end of the first energy storage control module and the first end of the second energy storage control module, a second output end is connected to the negative electrode of the power-type energy storage system and the second end of the second energy storage control module, and a third output end is connected to the third end of the second energy storage control module;

[0010] a first energy storage control module, a second end of which is connected to the fourth end of the second energy storage control module, and a third end of which is connected to the positive electrode of the power-type energy storage system;

[0011] Second energy storage control module.

[0012] In one embodiment of the present invention, the inverter full-bridge module includes a first bridge arm and a second bridge arm, the first bridge arm includes a first switch tube and a second switch tube, and the second bridge arm includes a third switch tube and a fourth switch tube;

[0013] The drain ends of the first switching tube and the third switching tube are connected to the positive electrode of the DC power supply as the first input end of the inverter full-bridge module;

[0014] The source ends of the second switch tube and the fourth switch tube are connected to the negative electrode of the DC power supply as the second input end of the inverter full-bridge module;

[0015] The source end of the first switch tube and the drain end of the second switch tube are connected to the first input end of the transformer module as the first output end of the inverter full-bridge module;

[0016] The source end of the third switch tube and the drain end of the fourth switch tube are connected to the second input end of the transformer module as the second output end of the inverter full-bridge module.

[0017] In one embodiment of the present invention, the transformer module includes:

[0018] The primary winding has a like-name end connected to the first output end of the inverter full-bridge module as the first input end of the transformer module, and an opposite-name end connected to the second output end of the inverter full-bridge module as the second input end of the transformer module;

[0019] A first secondary winding, wherein the same-name end of the first secondary winding serves as the first output end of the transformer module and is connected to the first input end of the rectifier full-bridge module, and the opposite-name end of the first secondary winding serves as the second output end of the transformer module and is connected to the second input end of the rectifier full-bridge module;

[0020] The second secondary winding has its like-name end connected to the third input end of the rectifier full-bridge module as the third output end of the transformer module, and its unlike-name end connected to the fourth input end of the rectifier full-bridge module as the fourth output end of the transformer module.

[0021] In one embodiment of the present invention, the rectifier full-bridge module includes:

[0022] a first full-bridge unit, wherein the first input end is connected to the first output end of the transformer module, the second input end is connected to the second output end of the transformer module, the first output end is connected to the first end of the first energy storage control module and the first end of the second energy storage control module respectively, and the second output end is connected to the negative electrode of the power type energy storage system and the second end of the second energy storage control module;

[0023] A second full-bridge unit, wherein the first input end is connected to the third output end of the transformer module, the second input end is connected to the fourth output end of the transformer module, the first output end is respectively connected to the negative electrode of the power-type energy storage system and the second end of the second energy storage control module, and the second output end is connected to the third end of the second energy storage control module.

[0024] In one embodiment of the present invention, the first full-bridge unit includes a third bridge arm and a fourth bridge arm, the third bridge arm includes a first diode and a second diode, and the fourth bridge arm includes a third diode and a fourth diode;

[0025] The anode of the first diode and the cathode of the second diode are connected to the first output end of the transformer module as the first input end of the first full-bridge unit;

[0026] The anode of the third diode and the cathode of the fourth diode are connected to the second output end of the transformer module as the second input end of the first full-bridge unit;

[0027] The cathode of the first diode and the cathode of the third diode are connected to the first end of the first energy storage control module and the first end of the second energy storage control module as the first output end of the first full-bridge unit respectively;

[0028] The anode of the second diode and the anode of the fourth diode serve as the second output end of the first full-bridge unit and are connected to the negative electrode of the power-type energy storage system and the second end of the second energy storage control module respectively.

[0029] In one embodiment of the present invention, the second full-bridge unit includes a fifth bridge arm and a sixth bridge arm, the fifth bridge arm includes a fifth diode and a sixth diode, and the sixth bridge arm includes a seventh diode and an eighth diode;

[0030] The cathode of the fifth diode and the anode of the sixth diode are connected to the third output terminal of the transformer module as the first input terminal of the second full-bridge unit;

[0031] The cathode of the seventh diode and the anode of the eighth diode are connected to the fourth output terminal of the transformer module as the second input terminal of the second full-bridge unit;

[0032] The anode of the fifth diode and the anode of the seventh diode are connected as the first output end of the second full-bridge unit to the negative electrode of the power-type energy storage system and the second end of the second energy storage control module respectively;

[0033] The cathode of the sixth diode and the cathode of the eighth diode are connected to the third end of the second energy storage control module as the second output end of the second full-bridge unit.

[0034] In one embodiment of the present invention, the first energy storage control module includes a first inductor, a fifth switch tube, a ninth diode and a first energy storage capacitor;

[0035] The first end of the first inductor is connected to the first output end of the rectifier full-bridge module as the first end of the first energy storage control module;

[0036] The second end of the first inductor, the anode of the ninth diode and the drain end of the fifth switching tube are connected;

[0037] The cathode of the ninth diode and the first end of the first energy storage capacitor are connected as the second end of the first energy storage control module and the fourth end of the second energy storage control module;

[0038] The source end of the fifth switching tube and the second end of the first energy storage capacitor are connected to the positive electrode of the power type energy storage system as the third end of the first energy storage control module.

[0039] In one embodiment of the present invention, the second energy storage control module includes a sixth switch tube, a second energy storage capacitor and a second inductor;

[0040] The source end of the sixth switch tube is connected to the first output end of the rectifier full-bridge module as the first end of the second energy storage control module;

[0041] The first end of the second energy storage capacitor is connected to the second output end of the rectifier full-bridge module as the second end of the second energy storage control module;

[0042] The first end of the second inductor is connected to the third output end of the rectifier full-bridge module as the third end of the second energy storage control module;

[0043] The second end of the second inductor, the drain end of the sixth switch tube and the second end of the second energy storage capacitor are connected to the second end of the first energy storage control module as the fourth end of the second energy storage control module.

[0044] In one embodiment of the present invention, the full-bridge fast charging circuit further includes a buffer module, and the buffer module includes a third inductor and a tenth diode;

[0045] A first end of the third inductor is connected to the fourth end of the second energy storage control module, and a second end of the third inductor is connected to the cathode of the tenth diode;

[0046] An anode of the tenth diode is connected to the second end of the first energy storage control module.

[0047] Based on the same inventive concept, another embodiment of the present invention further provides a charger for a power-type energy storage system, wherein the charger includes a fast charging circuit for the power-type energy storage system as described in any of the above embodiments.

[0048] As described above, the present invention provides a full-bridge fast charging circuit for a power-type energy storage system, comprising an inverter full-bridge module, a transformer module, a rectifier full-bridge module, a first energy storage control module, and a second energy storage control module. The input end of the inverter full-bridge module is connected to a DC power supply. The input end of the transformer module is connected to the output end of the inverter full-bridge module, and the output end is connected to the input end of the rectifier full-bridge module. The first output end of the rectifier full-bridge module is respectively connected to the first end of the first energy storage control module and the first end of the second energy storage control module, the second output end is respectively connected to the negative pole of the power-type energy storage system and the second end of the second energy storage control module, the third output end is connected to the third end of the second energy storage control module, the second end of the first energy storage control module is connected to the fourth end of the second energy storage control module, and the third end is connected to the positive pole of the power-type energy storage system. The full-bridge fast-charging circuit of the power-type energy storage system innovatively introduces energy storage capacitors, which are used to precisely regulate the rising and falling edges of the pulse current, shortening the completion time of the pulse rising and falling edges, thereby achieving rapid and efficient conversion between the circuit's continuous current charging mode and pulse current charging mode. Of course, any product implementing the present invention does not necessarily need to achieve all of the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 A system block diagram of a full-bridge fast charging circuit for a power-type energy storage system provided by an exemplary embodiment of the present application.

[0051] Figure 2 A circuit diagram of a full-bridge fast charging circuit of a power-type energy storage system provided by an exemplary embodiment of the present application.

[0052] Figure 3 A first circuit diagram of an exemplary embodiment of the present application provides a circuit operating in a current stabilization mode to transfer energy from a DC power supply side to a power-type energy storage system side.

[0053] Figure 4 A second circuit diagram of an exemplary embodiment of the present application provides a circuit operating in a current stabilization mode to transfer energy from a DC power supply side to a power-type energy storage system side.

[0054] Figure 5 This is a first circuit diagram of an exemplary embodiment of the present application, in which a circuit operates in a current stabilization mode to charge a second energy storage control module.

[0055] Figure 6 A second circuit diagram of an exemplary embodiment of the present application provides a circuit operating in a current stabilization mode to charge a second energy storage control module.

[0056] Figure 7 A circuit diagram of an exemplary embodiment of the present application showing a circuit operating in a pulse rising mode.

[0057] Figure 8 A circuit diagram of an exemplary embodiment of the present application showing a circuit operating in a pulse-down mode.

[0058] The reference numerals are as follows:

[0059] 100 DC power supply

[0060] 200 Inverter Full Bridge Module

[0061] 300 transformer module

[0062] 400 full-bridge rectifier module

[0063] 410 First full-bridge unit

[0064] 420 Second full-bridge unit

[0065] 500 First energy storage control module

[0066] 600 Second energy storage control module

[0067] 700 buffer module

[0068] 800 Power Energy Storage System DETAILED DESCRIPTION

[0069] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0070] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0071] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, publicly known structures and devices are shown in block diagram form rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0072] Traditional full-bridge converters can switch between continuous current charging mode and pulse current charging mode by regulating the working state of the switching tube. However, during the mode switching process, the average voltage across the output inductor is at a low level, resulting in a limited rate of change of the inductor current. Specifically, when in a low-voltage drive environment, the output inductor needs to undergo a long energy release or accumulation process when the inductor current switches from continuous current charging mode to pulse current charging mode, or vice versa. During the energy release phase, the stored energy in the inductor needs to be gradually dissipated, and during the energy accumulation phase, the inductor needs to slowly store energy. This long energy conversion time leads to a significant delay in mode switching.

[0073] In order to solve the problem that the fast charging and discharging characteristics of power-type energy storage systems in the prior art are not fully utilized, the present invention provides a full-bridge fast charging circuit for a power-type energy storage system. The circuit is optimized based on a traditional full-bridge converter. By introducing energy storage capacitors into the circuit, the rising and falling edges of the pulse current are adjusted by using them, thereby shortening the completion time of the pulse rising and falling edges, thereby realizing rapid conversion of the circuit between continuous current charging mode and pulse current charging mode.

[0074] It should be noted that the full-bridge fast-charging circuit of the power-type energy storage system has two charging modes: continuous current charging mode and pulse current charging mode. In the pulse current charging mode, the charging current has a pulse rising edge and a pulse falling edge. Specifically, during the pulse rising edge phase, the charging current rapidly switches from a first stable current to a second stable current. During the pulse falling edge phase, the charging current switches from the second stable current back to the first stable current. It is worth noting that during the transition between the pulse rising edge and the pulse falling edge, the charging current exhibits an unstable continuous current state, with a current value greater than the first stable current and less than the second stable current. It is understandable that the completion time of the pulse rising edge and the pulse falling edge is limited by the specific charging circuit. The full-bridge fast-charging circuit of the power-type energy storage system described in the present invention can minimize the completion time of the pulse rising edge and the pulse falling edge by optimizing the circuit structure, thereby achieving efficient switching between the continuous current charging mode and the pulse current charging mode, improving charging efficiency, and realizing fast charging or even ultra-fast charging. In this embodiment, the value of the first stable current can be set to 11A or 10A, and the value of the second stable current can be set to 61A or 36A. Of course, in other embodiments, in view of the differences in actual application scenarios, the specific current values ​​of the first stable current and the second stable current can be customized according to actual needs.

[0075] See also Figure 1 As shown, in an exemplary embodiment of the present application, the full-bridge fast charging circuit includes an inverter full-bridge module 200, a transformer module 300, a rectifier full-bridge module 400, a first energy storage control module 500, and a second energy storage control module 600. The input end of the inverter full-bridge module 200 is connected to the DC power supply 100. The input end of the transformer module 300 is connected to the output end of the inverter full-bridge module 200, and the output end is connected to the input end of the rectifier full-bridge module 400. The first output end of the rectifier full-bridge module 400 is respectively connected to the first end of the first energy storage control module 500 and the first end of the second energy storage control module 600. The second output end is respectively connected to the negative electrode of the power-type energy storage system 800 and the second end of the second energy storage control module 600. The third output end is connected to the third end of the second energy storage control module 600. The second end of the first energy storage control module 500 is connected to the fourth end of the second energy storage control module 600, and the third end is connected to the positive electrode of the power-type energy storage system 800. Please note that Figure 2 As shown, in this embodiment, the power energy storage system 900 is a high power energy storage system (HPESS) constructed based on electrochemical capacitors.

[0076] See also Figure 1 and Figure 2 As shown, in an exemplary embodiment of the present application, the inverter full-bridge module 200 includes a first bridge arm and a second bridge arm, the first bridge arm and the second bridge arm are connected in parallel between the positive pole and the negative pole of the DC power supply 100, the midpoint of the first bridge arm serves as the first output end of the inverter full-bridge module 200 and is connected to the first input end of the transformer module 300, and the midpoint of the second bridge arm serves as the second output end of the inverter full-bridge module 200 and is connected to the second input end of the transformer module 300.

[0077] Please continue reading Figure 1 and Figure 2 As shown, in an exemplary embodiment of the present application, the first bridge arm includes a first switch tube S1 and a second switch tube S2, and the second bridge arm includes a third switch tube S3 and a fourth switch tube S4. The drain ends of the first switch tube S1 and the third switch tube S3 serve as the first input end of the inverter full-bridge module 200 and are connected to the positive electrode of the DC power supply 100. The source ends of the second switch tube S2 and the fourth switch tube S4 serve as the second input end of the inverter full-bridge module 200 and are connected to the negative electrode of the DC power supply 100. The source end of the first switch tube S1 and the drain end of the second switch tube S2 serve as the first output end of the inverter full-bridge module 200 and are connected to the first input end of the transformer module 300. The source end of the third switch tube S3 and the drain end of the fourth switch tube S4 serve as the second output end of the inverter full-bridge module 200 and are connected to the second input end of the transformer module 300.

[0078] Please continue reading Figure 2 As shown, in an exemplary embodiment of the present application, the transformer module 300 includes a primary winding n1, a first secondary winding n2 and a second secondary winding n3. c The like-name end of the first secondary winding n2 is connected to the first input end of the transformer module 300 and the first output end of the inverter full-bridge module 200 as the first input end of the transformer module 300, and the unlike-name end is connected to the second output end of the inverter full-bridge module 200 as the second input end of the transformer module 300. The like-name end of the first secondary winding n2 is connected to the first input end of the rectifier full-bridge module 400 as the first output end of the transformer module 300, and the unlike-name end is connected to the second input end of the rectifier full-bridge module 400 as the second output end of the transformer module 300. The like-name end of the second secondary winding n3 is connected to the third input end of the rectifier full-bridge module 400 as the third output end of the transformer module 300, and the unlike-name end is connected to the fourth input end of the rectifier full-bridge module 400 as the fourth output end of the transformer module 300.

[0079] Please continue reading Figure 1 and Figure 2 As shown, in an exemplary embodiment of the present application, the rectifier full-bridge module 400 includes a first full-bridge unit 410 and a second full-bridge unit 420, wherein the first input end of the first full-bridge unit 410 is connected to the first output end of the transformer module 300, the second input end is connected to the second output end of the transformer module 300, the first output end is respectively connected to the first end of the first energy storage control module 500 and the first end of the second energy storage control module 600, the second output end is respectively connected to the negative pole of the power type energy storage system 800 and the second end of the second energy storage control module 600, the first input end of the second full-bridge unit 420 is connected to the third output end of the transformer module 300, the second input end is connected to the fourth output end of the transformer module 300, the first output end is respectively connected to the negative pole of the power type energy storage system 800 and the second end of the second energy storage control module 600, and the second output end is connected to the third end of the second energy storage control module 600.

[0080] Please continue reading Figure 1 and Figure 2 As shown, in an exemplary embodiment of the present application, the first full-bridge unit 410 includes a third bridge arm and a fourth bridge arm, the third bridge arm includes a first diode D1 and a second diode D2, and the fourth bridge arm includes a third diode D3 and a fourth diode D4. The anode of the first diode D1 and the cathode of the second diode D2 are connected as the first input end of the first full-bridge unit 410 to the first output end of the transformer module 300, the anode of the third diode D3 and the cathode of the fourth diode D4 are connected as the second input end of the first full-bridge unit 410 to the second output end of the transformer module 300, the cathode of the first diode D1 and the cathode of the third diode D3 are connected as the first output end of the first full-bridge unit 410 to the first end of the first energy storage control module 500 and the first end of the second energy storage control module 600, respectively, and the anode of the second diode D2 and the anode of the fourth diode D4 are connected as the second output end of the first full-bridge unit 410 to the negative electrode of the power energy storage system 800 and the second end of the second energy storage control module 600, respectively.

[0081] Please continue reading Figure 1 and Figure 2As shown, in an exemplary embodiment of the present application, the second full-bridge unit 420 includes a fifth bridge arm and a sixth bridge arm, the fifth bridge arm includes a fifth diode D5 and a sixth diode D6, and the sixth bridge arm includes a seventh diode D7 and an eighth diode D8. The cathode of the fifth diode D5 and the anode of the sixth diode D6 are connected as the first input end of the second full-bridge unit 420 to the third output end of the transformer module 300, the cathode of the seventh diode D7 and the anode of the eighth diode D8 are connected as the second input end of the second full-bridge unit 420 to the fourth output end of the transformer module 300, the anode of the fifth diode D5 and the anode of the seventh diode D7 are connected as the first output end of the second full-bridge unit to the negative electrode of the power energy storage system 800 and the second end of the second energy storage control module 600 respectively, and the cathode of the sixth diode D6 and the cathode of the eighth diode D8 are connected as the second output end of the second full-bridge unit 420 to the third end of the second energy storage control module 600.

[0082] Please continue reading Figure 1 and Figure 2 As shown, in an exemplary embodiment of the present application, the first energy storage control module 500 includes a first inductor L o , the fifth switch tube S5, the ninth diode D9 and the first energy storage capacitor C f , the first inductor L o The first end of the first energy storage control module 500 is connected to the first output end of the rectifier full-bridge module 400, and the first inductor L o The second end of the ninth diode D9 and the anode of the ninth diode D9 are connected to the drain end of the fifth switch tube S5, and the cathode of the ninth diode D9 and the first energy storage capacitor C f The second end of the first energy storage control module 500 is connected to the fourth end of the second energy storage control module 600, and the source end of the fifth switch tube S5 and the first energy storage capacitor C f The first end of the first energy storage control module 500 is connected to the positive electrode of the power-type energy storage system 800 as the third end.

[0083] Please continue reading Figure 1 and Figure 2 As shown, in an exemplary embodiment of the present application, the second energy storage control module 600 includes a sixth switch tube S6, a second energy storage capacitor and a second inductor L c The source end of the sixth switch tube S6 is connected to the first output end of the rectifier full-bridge module 400 as the first end of the second energy storage control module 600. The second energy storage capacitor C rThe first end of the second energy storage control module 600 is connected to the second output end of the rectifier full-bridge module 400, and the second inductor L c The first end of the second energy storage control module 600 is connected to the third output end of the rectifier full-bridge module 400 as the third end of the second energy storage control module 600, and the second inductor L c The second end of the sixth switch tube S6 and the drain end of the second energy storage capacitor C r The second end of the second energy storage control module 600 is connected to the second end of the first energy storage control module 500 as the fourth end of the second energy storage control module 600.

[0084] Please continue reading Figure 1 and Figure 2 As shown, in an exemplary embodiment of the present application, the full-bridge fast charging circuit further includes a buffer module 700, and the buffer module 700 includes a third inductor L b and the tenth diode D 10 , the third inductor L b The first end is connected to the fourth end of the second energy storage control module 600, and the second end is connected to the tenth diode D 10 The cathode of the tenth diode D is connected 10 The anode is connected to the second end of the first energy storage control module 500.

[0085] The following is a detailed introduction to the working principle of the full-bridge fast charging circuit of the power-type energy storage system:

[0086] When the circuit is in steady-state current mode operation, that is, when the output current is stably maintained at the peak level of continuous current or pulse current, and there is no need to transition between continuous current and pulse current, its working principle is similar to that of a full-bridge converter. Figure 3 As shown in FIG, when the first switch tube S1 and the fourth switch tube S4 are in the on state, a forward voltage will be applied to the primary side of the transformer. At this moment, the first diode D1 and the fourth diode D4 on the secondary side of the transformer are in the forward conduction state, thereby realizing the transfer of energy from the primary side of the transformer to the secondary side of the transformer. Figure 4 As shown, when the second switch tube S2 and the third switch tube S3 are in the on state, a reverse voltage is applied to the primary side of the transformer. At this time, the second diode D2 and the third diode D3 on the secondary side of the transformer are turned on, thereby realizing the transfer of energy from the primary side of the transformer to the secondary side of the transformer. It should be noted that by precisely controlling the duty cycle of the drive signal of the switch tubes (S1, S2, S3, S4) in the inverter full-bridge module 200 within a complete cycle, the functional relationship between the output voltage and the input voltage can be effectively controlled, thereby achieving precise control of the charging process of the power-type energy storage system.

[0087] In order to realize the rapid conversion from continuous current charging mode to pulse current charging mode, the second energy storage capacitor C r Establish and maintain a specific high voltage in, equal Specifically, see Figure 5 and Figure 6 As shown, when the second energy storage capacitor C r The voltage is less than When the charging circuit charges the power type energy storage system, its dual output structure will also charge the second energy storage capacitor C synchronously. r Charge until the second energy storage capacitor C r The voltage reaches

[0088] For a full-bridge converter, when its operating state needs to switch from continuous current charging mode to pulse current charging mode, its output current rise rate can be expressed as:

[0089]

[0090] When the circuit is in pulse rising mode operation, refer to Figure 7 As shown, the fifth switch tube S5 and the sixth switch tube S6 are in the on state. Assuming that the circuit has been working in a stable state, the current stabilization mode is based on the second energy storage capacitor C r High voltage on Applied to the first inductor L o And high power energy storage system HPESS, assuming that during the pulse rising process the second energy storage capacitor C t If the voltage remains unchanged, the output current rising rate can be expressed as:

[0091]

[0092] in, Therefore, compared with the full-bridge converter, the full-bridge fast charging circuit of the present invention can achieve a faster conversion from continuous current to pulse current. After the conversion is completed, it switches to the current stabilization mode to ensure the stability and reliability of the charging process. It should be noted that in this process, the second energy storage capacitor C r The voltage of the first energy storage capacitor C f The stored energy will be transferred to the tenth diode D 10 And the third inductor L b The energy transfer path formed is transferred to the second energy storage capacitor C r In order to realize the redistribution and utilization of energy.

[0093] For a full-bridge converter, when its operating state needs to switch from pulse current charging mode to continuous current charging mode, its output current decrease rate can be expressed as:

[0094]

[0095] When the circuit is in pulse-down mode operation, refer to Figure 8 As shown, the first switch tube S1 to the sixth switch tube S6 are all in the off state, and the first energy storage capacitor C f Introduces a large voltage drop and accelerates the transition of the output current:

[0096]

[0097] in, Similarly, when the conversion is completed, it switches to the current stabilization mode to ensure the stability and reliability of the charging process. f The voltage of the first energy storage capacitor C f The energy will pass through the tenth diode D 10 And the third inductor L b The energy transfer path formed is transferred to the second energy storage capacitor C r In order to realize the redistribution and utilization of energy.

[0098] In summary, the present invention provides a full-bridge fast charging circuit for a power-type energy storage system, comprising an inverter full-bridge module 200, a transformer module 300, a rectifier full-bridge module 400, a first energy storage control module 500, and a second energy storage control module 600. The input end of the inverter full-bridge module 200 is connected to a DC power supply 100. The input end of the transformer module 300 is connected to the output end of the inverter full-bridge module 200, and the output end is connected to the input end of the rectifier full-bridge module 400. The first output end of the rectifier full-bridge module 400 is connected to the first end of the first energy storage control module 500 and the first end of the second energy storage control module 600. The second output end is connected to the negative electrode of the power-type energy storage system 800 and the second end of the second energy storage control module 600. The third output end is connected to the third end of the second energy storage control module 600. The second end of the first energy storage control module 500 is connected to the fourth end of the second energy storage control module 600, and the third end is connected to the positive electrode of the power-type energy storage system 800. The circuit innovatively introduces an energy storage capacitor, which uses the energy storage capacitor to accurately adjust the rising and falling edges of the pulse current, shortening the completion time of the pulse rising and falling edges, thereby realizing fast and efficient conversion of the circuit between continuous current charging mode and pulse current charging mode.

[0099] Based on the same inventive concept, another embodiment of the present invention further provides a charger for a power-type energy storage system, comprising the full-bridge fast-charging circuit for a power-type energy storage system described in any of the above embodiments. Because the charger for a power-type energy storage system provided in this embodiment shares the same inventive concept as the full-bridge fast-charging circuit for a power-type energy storage system provided in any of the above embodiments, and therefore, each of these components has at least the same beneficial effects, they will not be further detailed herein.

[0100] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A full-bridge fast charging circuit for a power-type energy storage system, characterized in that: include: An inverter full-bridge module, the input end of which is connected to a DC power supply; A transformer module, whose input end is connected to the output end of the inverter full-bridge module, and whose output end is connected to the input end of the rectifier full-bridge module; A rectifier full-bridge module, wherein a first output end is connected to the first end of the first energy storage control module and the first end of the second energy storage control module, a second output end is connected to the negative electrode of the power-type energy storage system and the second end of the second energy storage control module, and a third output end is connected to the third end of the second energy storage control module; a first energy storage control module, a second end of which is connected to the fourth end of the second energy storage control module, and a third end of which is connected to the positive electrode of the power-type energy storage system; Second energy storage control module.

2. The full-bridge fast charging circuit of the power type energy storage system according to claim 1, characterized in that: The inverter full-bridge module includes a first bridge arm and a second bridge arm, the first bridge arm includes a first switch tube and a second switch tube, and the second bridge arm includes a third switch tube and a fourth switch tube; The drain ends of the first switching tube and the third switching tube are connected to the positive electrode of the DC power supply as the first input end of the inverter full-bridge module; The source ends of the second switch tube and the fourth switch tube are connected to the negative electrode of the DC power supply as the second input end of the inverter full-bridge module; The source end of the first switch tube and the drain end of the second switch tube are connected to the first input end of the transformer module as the first output end of the inverter full-bridge module; The source end of the third switch tube and the drain end of the fourth switch tube are connected to the second input end of the transformer module as the second output end of the inverter full-bridge module.

3. The full-bridge fast charging circuit of the power type energy storage system according to claim 1, characterized in that: The transformer module includes: The primary winding has a like-name end connected to the first output end of the inverter full-bridge module as the first input end of the transformer module, and an opposite-name end connected to the second output end of the inverter full-bridge module as the second input end of the transformer module; A first secondary winding, wherein the same-name end of the first secondary winding serves as the first output end of the transformer module and is connected to the first input end of the rectifier full-bridge module, and the opposite-name end of the first secondary winding serves as the second output end of the transformer module and is connected to the second input end of the rectifier full-bridge module; The second secondary winding has its like-name end connected to the third input end of the rectifier full-bridge module as the third output end of the transformer module, and its unlike-name end connected to the fourth input end of the rectifier full-bridge module as the fourth output end of the transformer module.

4. The full-bridge fast charging circuit of the power type energy storage system according to claim 1, characterized in that: The rectifier full-bridge module includes: a first full-bridge unit, wherein the first input end is connected to the first output end of the transformer module, the second input end is connected to the second output end of the transformer module, the first output end is connected to the first end of the first energy storage control module and the first end of the second energy storage control module respectively, and the second output end is connected to the negative electrode of the power type energy storage system and the second end of the second energy storage control module; A second full-bridge unit, wherein the first input end is connected to the third output end of the transformer module, the second input end is connected to the fourth output end of the transformer module, the first output end is respectively connected to the negative electrode of the power-type energy storage system and the second end of the second energy storage control module, and the second output end is connected to the third end of the second energy storage control module.

5. The full-bridge fast charging circuit of the power type energy storage system according to claim 4, characterized in that: The first full-bridge unit includes a third bridge arm and a fourth bridge arm, the third bridge arm includes a first diode and a second diode, and the fourth bridge arm includes a third diode and a fourth diode; The anode of the first diode and the cathode of the second diode are connected to the first output end of the transformer module as the first input end of the first full-bridge unit; The anode of the third diode and the cathode of the fourth diode are connected to the second output end of the transformer module as the second input end of the first full-bridge unit; The cathode of the first diode and the cathode of the third diode are connected to the first end of the first energy storage control module and the first end of the second energy storage control module as the first output end of the first full-bridge unit respectively; The anode of the second diode and the anode of the fourth diode serve as the second output end of the first full-bridge unit and are connected to the negative electrode of the power-type energy storage system and the second end of the second energy storage control module respectively.

6. The full-bridge fast charging circuit of the power type energy storage system according to claim 4, characterized in that: The second full-bridge unit includes a fifth bridge arm and a sixth bridge arm, the fifth bridge arm includes a fifth diode and a sixth diode, and the sixth bridge arm includes a seventh diode and an eighth diode; The cathode of the fifth diode and the anode of the sixth diode are connected to the third output terminal of the transformer module as the first input terminal of the second full-bridge unit; The cathode of the seventh diode and the anode of the eighth diode are connected to the fourth output terminal of the transformer module as the second input terminal of the second full-bridge unit; The anode of the fifth diode and the anode of the seventh diode are connected as the first output end of the second full-bridge unit to the negative electrode of the power-type energy storage system and the second end of the second energy storage control module respectively; The cathode of the sixth diode and the cathode of the eighth diode are connected to the third end of the second energy storage control module as the second output end of the second full-bridge unit.

7. The full-bridge fast charging circuit of the power type energy storage system according to claim 1, characterized in that: The first energy storage control module includes a first inductor, a fifth switch tube, a ninth diode and a first energy storage capacitor; The first end of the first inductor is connected to the first output end of the rectifier full-bridge module as the first end of the first energy storage control module; The second end of the first inductor, the anode of the ninth diode and the drain end of the fifth switching tube are connected; The cathode of the ninth diode and the first end of the first energy storage capacitor are connected as the second end of the first energy storage control module and the fourth end of the second energy storage control module; The source end of the fifth switching tube and the second end of the first energy storage capacitor are connected to the positive electrode of the power type energy storage system as the third end of the first energy storage control module.

8. The full-bridge fast charging circuit of the power type energy storage system according to claim 1, characterized in that: The second energy storage control module includes a sixth switch tube, a second energy storage capacitor and a second inductor; The source end of the sixth switch tube is connected to the first output end of the rectifier full-bridge module as the first end of the second energy storage control module; The first end of the second energy storage capacitor is connected to the second output end of the rectifier full-bridge module as the second end of the second energy storage control module; The first end of the second inductor is connected to the third output end of the rectifier full-bridge module as the third end of the second energy storage control module; The second end of the second inductor, the drain end of the sixth switch tube and the second end of the second energy storage capacitor are connected to the second end of the first energy storage control module as the fourth end of the second energy storage control module.

9. The full-bridge fast charging circuit of the power type energy storage system according to claim 1, characterized in that: The full-bridge fast charging circuit further includes a buffer module, wherein the buffer module includes a third inductor and a tenth diode; A first end of the third inductor is connected to the fourth end of the second energy storage control module, and a second end of the third inductor is connected to the cathode of the tenth diode; An anode of the tenth diode is connected to the second end of the first energy storage control module.

10. A charger for a power-type energy storage system, characterized in that: A full-bridge fast charging circuit comprising a power-type energy storage system as claimed in any one of claims 1 to 9.

Images