A full-bridge fast charging circuit and charger for a power-type energy storage system

Abstract

This invention discloses a full-bridge fast charging circuit and charger for a power energy storage system. The circuit includes an inverter full-bridge module, a transformer module, a rectifier full-bridge module, and first and second energy storage control modules. The input terminal of the inverter full-bridge module is connected to a DC power supply, and its output terminal is connected to the input terminal of the transformer module. The output terminal of the transformer module is connected to the input terminal of the rectifier full-bridge module. The first output terminal of the rectifier full-bridge module is connected to the first terminals of the first and second energy storage control modules, the second output terminal is connected to the negative terminal of the power energy storage system and the second terminal of the second energy storage control module, and the third output terminal is connected to the third terminal of the second energy storage control module. The second terminal of the first energy storage control module is connected to the fourth terminal of the second energy storage control module, and the third terminal is connected to the positive terminal of the power energy storage system. This circuit adjusts the rising and falling edges of the pulse current through an energy storage capacitor to achieve rapid switching between continuous current charging mode and pulse current charging mode.

Description

Technical Field

[0001] This invention relates to the field of power energy storage system charging, and in particular to a full-bridge fast charging circuit and charger for a power energy storage system. Background Technology

[0002] Power-type energy storage systems (such as energy storage systems composed of one or more power-type energy storage devices such as electrochemical capacitors, power-type lithium-ion batteries, and sodium-ion batteries) are a type of device capable of storing and rapidly releasing 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 energy storage systems primarily employ traditional charging methods such as constant current charging, constant voltage charging, and constant power charging. While these methods can meet the basic charging requirements of power energy storage systems to some extent, they fail to fully exploit and utilize the unique advantages of high power density and the ability to withstand large pulse currents for rapid charging and discharging within a limited time. Therefore, how to fully utilize the characteristics of power energy storage systems and develop efficient fast or ultra-fast charging technologies has become an urgent problem to be solved in the field of power energy storage system charging. Summary of the Invention

[0004] The purpose of this invention is to provide a full-bridge fast charging circuit and charger for a power energy storage system. This circuit introduces an energy storage capacitor and uses the energy storage capacitor to adjust the rising and falling edges of the pulse current, thereby realizing the rapid switching between continuous current charging mode and pulse current charging mode. This solves the problem that the fast charging and discharging characteristics of the power energy storage system in the prior art are not fully utilized.

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

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

[0007] The inverter full-bridge module has its input terminal connected to a DC power supply.

[0008] The transformer module has its input terminal connected to the output terminal of the inverter full-bridge module and its output terminal connected to the input terminal of the rectifier full-bridge module.

[0009] The rectifier full-bridge module has its first output terminal connected to the first terminal of the first energy storage control module and the first terminal of the second energy storage control module, its second output terminal connected to the negative terminal of the power energy storage system and the second terminal of the second energy storage control module, and its third output terminal connected to the third terminal of the second energy storage control module.

[0010] The first energy storage control module has its second terminal connected to the fourth terminal of the second energy storage control module, and its third terminal connected to the positive terminal 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 including a first switch and a second switch, and the second bridge arm including a third switch and a fourth switch.

[0013] The drain terminals of the first and third switching transistors are connected to the positive terminal of the DC power supply as the first input terminal of the inverter full-bridge module.

[0014] The source terminals of the second and fourth switching transistors are connected to the negative terminal of the DC power supply as the second input terminal of the inverter full-bridge module.

[0015] The source terminal of the first switching transistor and the drain terminal of the second switching transistor are connected to the first input terminal of the transformer module as the first output terminal of the inverter full-bridge module.

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

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

[0018] The primary winding has its same-named end connected to the first output end of the inverter full-bridge module as the first input end of the transformer module, and its opposite-named end connected to the second output end of the inverter full-bridge module as the second input end of the transformer module.

[0019] The first secondary winding has its same-name terminal connected to the first input terminal of the rectifier full-bridge module as the first output terminal of the transformer module, and its opposite-name terminal connected to the second input terminal of the rectifier full-bridge module as the second output terminal of the transformer module.

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

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

[0022] The first full-bridge unit has its first input terminal connected to the first output terminal of the transformer module, its second input terminal connected to the second output terminal of the transformer module, its first output terminal connected to the first terminal of the first energy storage control module and the first terminal of the second energy storage control module, and its second output terminal connected to the negative terminal of the power-type energy storage system and the second terminal of the second energy storage control module.

[0023] The second full-bridge unit has its first input terminal connected to the third output terminal of the transformer module, its second input terminal connected to the fourth output terminal of the transformer module, its first output terminal connected to the negative terminal of the power-type energy storage system and the second terminal of the second energy storage control module, and its second output terminal connected to the third terminal 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 including a first diode and a second diode, and the fourth bridge arm including a third diode and a fourth diode;

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

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

[0027] The cathodes of the first diode and the third diode serve as the first output terminals of the first full-bridge unit and are respectively connected to the first terminal of the first energy storage control module and the first terminal of the second energy storage control module.

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

[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 including a fifth diode and a sixth diode, and the sixth bridge arm including 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 anodes of the fifth diode and the seventh diode serve as the first output terminal of the second full-bridge unit and are respectively connected to the negative terminal of the power-type energy storage system and the second terminal of the second energy storage control module.

[0033] The cathodes of the sixth diode and the eighth diode are connected to the third terminal of the second energy storage control module as the second output terminal 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 switching transistor, 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 terminal of the first inductor, the anode of the ninth diode, and the drain terminal of the fifth switching transistor 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 terminal of the fifth switching transistor and the second terminal of the first energy storage capacitor are connected to the positive terminal of the power energy storage system as the third terminal of the first energy storage control module.

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

[0040] The source terminal of the sixth switch is connected to the first output terminal of the rectifier full-bridge module as the first terminal 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 terminal of the second inductor, the drain terminal of the sixth switching transistor, and the second terminal of the second energy storage capacitor are connected to the second terminal of the first energy storage control module as the fourth terminal 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, the buffer module including a third inductor and a tenth diode;

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

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

[0047] Based on the same inventive concept, another embodiment of the present invention provides a charger for a power energy storage system, the charger including a fast charging circuit for the power 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 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 terminal of the inverter full-bridge module is connected to a DC power supply. The input terminal of the transformer module is connected to the output terminal of the inverter full-bridge module, and its output terminal is connected to the input terminal of the rectifier full-bridge module. The first output terminal of the rectifier full-bridge module is connected to the first terminal of the first energy storage control module and the first terminal of the second energy storage control module, respectively. The second output terminal is connected to the negative terminal of the power energy storage system and the second terminal of the second energy storage control module, respectively. The third output terminal is connected to the third terminal of the second energy storage control module. The second terminal of the first energy storage control module is connected to the fourth terminal of the second energy storage control module, and the third terminal is connected to the positive terminal of the power energy storage system. The full-bridge fast charging circuit of the power-type energy storage system innovatively introduces an energy storage capacitor, which is used to precisely adjust the rising and falling edges of the pulse current, shortening the completion time of the pulse rising and falling edges, thereby enabling the circuit to quickly and efficiently switch between continuous current charging mode and pulse current charging mode. Of course, any product implementing this invention does not necessarily need to achieve all the advantages described above simultaneously. Attached Figure Description

[0049] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a system block diagram of a full-bridge fast charging circuit for a power energy storage system provided as an exemplary embodiment of this application.

[0051] Figure 2 A circuit diagram of a full-bridge fast charging circuit for a power energy storage system provided as an exemplary embodiment of this application.

[0052] Figure 3 This is a schematic diagram of a first circuit provided for an exemplary embodiment of the present application, in which the circuit operates in a current-stabilized mode to transfer energy from the DC power supply side to the power storage system side.

[0053] Figure 4 This is a schematic diagram of a second circuit provided for an exemplary embodiment of the present application, in which the circuit operates in a current-stabilized mode to transfer energy from the DC power supply side to the power storage system side.

[0054] Figure 5 This is a schematic diagram of a first circuit for charging a second energy storage control module in a current-stabilized mode, provided as an exemplary embodiment of this application.

[0055] Figure 6 This is a schematic diagram of a second circuit for charging a second energy storage control module in a current-stabilized mode, provided as an exemplary embodiment of this application.

[0056] Figure 7 This is a circuit diagram showing the circuit operating in pulse rise mode, provided as an exemplary embodiment of this application.

[0057] Figure 8 This is a circuit diagram showing the circuit operating in pulse descent mode, provided as an exemplary embodiment of this application.

[0058] The attached figures are labeled as follows:

[0059] 100 DC power supply

[0060] 200 inverter full-bridge module

[0061] 300 Transformer Module

[0062] 400 rectifier full-bridge 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 type energy storage system Detailed Implementation

[0069] The following specific examples illustrate the implementation of the present invention. 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, and various 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, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

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

[0071] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, publicly known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0072] Traditional full-bridge converters can switch between continuous current charging and pulse current charging modes by controlling the operating state of the switching transistors. However, during mode switching, the average voltage across the output inductor is at a low level, limiting the rate of change of the inductor current. Specifically, in a low-voltage drive environment, the output inductor needs to undergo a relatively long energy release or accumulation process during the transition from continuous current charging to pulse current charging, or vice versa. During the energy release phase, the stored energy in the inductor needs to be gradually dissipated; during the energy accumulation phase, the inductor needs to slowly store energy. This long energy conversion time results in a significant delay in mode switching.

[0073] To address the issue that the rapid charging and discharging characteristics of existing power energy storage systems are not fully utilized, this invention provides a full-bridge fast charging circuit for power energy storage systems. This circuit is based on an optimized traditional full-bridge converter. By introducing an energy storage capacitor into the circuit, the rising and falling edges of the pulse current are adjusted, shortening the completion time of the pulse rising and falling edges, thereby enabling the circuit to quickly switch 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 energy storage system has two charging modes: continuous current charging mode and pulse current charging mode. In pulse current charging mode, the charging current has a rising edge and a falling edge. Specifically, during the rising edge of the pulse, the charging current rapidly switches from a first stable current to a second stable current. During the falling edge of the pulse, the charging current switches back from the second stable current to the first stable current. It is worth noting that during the transition between the rising and falling edges of the pulse, 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 understood that the completion time of the rising and falling edges of the pulse is limited by the specific charging circuit. The full-bridge fast charging circuit of the power energy storage system described in this invention, by optimizing the circuit structure, can shorten the completion time of the rising and falling edges of the pulse as much as possible, thereby achieving efficient switching between continuous current charging mode and 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, given 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] Please see Figure 1 As shown in an exemplary embodiment of this 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 terminal of the inverter full-bridge module 200 is connected to a DC power supply 100. The input terminal of the transformer module 300 is connected to the output terminal of the inverter full-bridge module 200, and its output terminal is connected to the input terminal of the rectifier full-bridge module 400. The first output terminal of the rectifier full-bridge module 400 is connected to the first terminal of the first energy storage control module 500 and the first terminal of the second energy storage control module 600, respectively. The second output terminal is connected to the negative terminal of the power-type energy storage system 800 and the second terminal of the second energy storage control module 600, respectively. The third output terminal is connected to the third terminal of the second energy storage control module 600. The second terminal of the first energy storage control module 500 is connected to the fourth terminal of the second energy storage control module 600, and the third terminal is connected to the positive terminal of the power-type energy storage system 800. It should be noted that you should refer to [link / reference]. 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] Please see Figure 1 and Figure 2 As shown, in an exemplary embodiment of this 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 and negative terminals of the DC power supply 100. The midpoint of the first bridge arm serves as the first output terminal of the inverter full-bridge module 200 and is connected to the first input terminal of the transformer module 300. The midpoint of the second bridge arm serves as the second output terminal of the inverter full-bridge module 200 and is connected to the second input terminal of the transformer module 300.

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

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

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

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

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

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

[0083] Please continue reading. Figure 1 and Figure 2 As shown, in an exemplary embodiment of this application, the second energy storage control module 600 includes a sixth switch S6, a second energy storage capacitor, and a second inductor L. c The source terminal of the sixth switch S6 serves as the first terminal of the second energy storage control module 600 and is connected to the first output terminal of the rectifier full-bridge module 400. The second energy storage capacitor C... rThe first end serves as the second end of the second energy storage control module 600 and is connected to the second output end of the rectifier full-bridge module 400. The second inductor L c The first end serves as the third end of the second energy storage control module 600 and is connected to the third output end of the rectifier full-bridge module 400. The second inductor L c The second terminal, the drain terminal of the sixth switch S6, and the second energy storage capacitor C r The second end 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 this application, the full-bridge fast charging circuit further includes a buffer module 700, the buffer module 700 including a third inductor L b and the tenth diode D 10 The third inductor L b The first terminal is connected to the fourth terminal of the second energy storage control module 600, and the second terminal is connected to the tenth diode D. 10 The cathode connection of the tenth diode D 10 The anode is connected to the second end of the first energy storage control module 500.

[0085] The working principle of the full-bridge fast charging circuit of the power-type energy storage system will be described in detail below:

[0086] When the circuit operates in steady-state current mode, meaning the output current is stably maintained at the peak level of either the continuous or pulsed current, and there is no need for a transition between the continuous and pulsed currents, its operating principle is similar to that of a full-bridge converter. For details, please refer to [link to relevant documentation]. Figure 3 As shown, when the first switch S1 and the fourth switch S4 are in the ON state, a forward voltage is applied to the primary side of the transformer. At this time, the first diode D1 and the fourth diode D4 on the secondary side of the transformer are in the forward conducting state, thereby realizing the transfer of energy from the primary side to the secondary side of the transformer. Please refer to [link to relevant documentation]. Figure 4 As shown, when the second switch S2 and the third switch 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 to the secondary side of the transformer. It should be noted that by precisely controlling the duty cycle of the drive signals of the switches (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 storage system.

[0087] To achieve a rapid transition from continuous current charging mode to pulse current charging mode, a second energy storage capacitor C is used. r Establish and maintain a specific high voltage. in, equal Specifically, please refer to Figure 5 and Figure 6 As shown, when the second energy storage capacitor C r The voltage is less than At the same time, while the charging circuit charges the power-type energy storage system, its dual-output structure also simultaneously charges the second energy storage capacitor C. r Charge until the second energy storage capacitor C is charged. r The voltage reached

[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 operating in pulse rising mode, please refer to [link / reference]. Figure 7 As shown, the fifth switch S5 and the sixth switch S6 are in the on state. Assuming the circuit is already operating in a stable state, the current stabilization mode is established based on the second energy storage capacitor C. r High voltage on Applied to the first inductor L o In the high-power energy storage system HPESS, assuming that during the pulse rise process, the second energy storage capacitor C t If the voltage remains constant, the rate of increase of the output current can be expressed as:

[0091]

[0092] in, Therefore, compared to a full-bridge converter, the full-bridge fast charging circuit described in this invention can achieve a faster conversion from continuous current to pulsed current. After the conversion is complete, it switches to a current stabilization mode to ensure the stability and reliability of the charging process. It should be noted that during this process, the second energy storage capacitor C... r The voltage will gradually decrease due to the release of energy, and at the same time, the voltage of the first energy storage capacitor C... f The stored 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 achieve 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 operating in pulse fall mode, please refer to [link / reference]. Figure 8 As shown, all six switches, from the first switch S1 to the sixth switch S6, are in the off state, and the first energy storage capacitor C... f This introduces a large voltage drop and accelerates the transition of the output current:

[0096]

[0097] in, Similarly, once the conversion is complete, it switches to current stabilization mode to ensure the stability and reliability of the charging process. During this process, the first energy storage capacitor C... f The voltage continues to rise, therefore, 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 achieve the redistribution and utilization of energy.

[0098] In summary, the present invention provides a full-bridge fast charging circuit for a power 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 terminal of the inverter full-bridge module 200 is connected to a DC power supply 100. The input terminal of the transformer module 300 is connected to the output terminal of the inverter full-bridge module 200, and its output terminal is connected to the input terminal of the rectifier full-bridge module 400. The first output terminal of the rectifier full-bridge module 400 is connected to the first terminal of the first energy storage control module 500 and the first terminal of the second energy storage control module 600; the second output terminal is connected to the negative terminal of the power energy storage system 800 and the second terminal of the second energy storage control module 600; the third output terminal is connected to the third terminal of the second energy storage control module 600; the second terminal of the first energy storage control module 500 is connected to the fourth terminal of the second energy storage control module 600; and the third terminal is connected to the positive terminal of the power energy storage system 800. The circuit innovatively incorporates an energy storage capacitor, which precisely adjusts the rising and falling edges of the pulse current, shortening the completion time of the pulse rising and falling edges. This enables the circuit to switch quickly and efficiently between continuous current charging mode and pulse current charging mode.

[0099] Based on the same inventive concept, another embodiment of the present invention also provides a charger for a power-type energy storage system, wherein the charger for the power-type energy storage system includes the full-bridge fast charging circuit of the power-type energy storage system described in any of the above embodiments. Since the charger for the power-type energy storage system provided in this embodiment belongs to the same inventive concept as the full-bridge fast charging circuit of the power-type energy storage system provided in any of the above embodiments, it has at least the same beneficial effects, which will not be elaborated upon here.

[0100] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can 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 those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still 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: The inverter full-bridge module has its input terminal connected to a DC power supply. The transformer module has its input terminal connected to the output terminal of the inverter full-bridge module and its output terminal connected to the input terminal of the rectifier full-bridge module. The rectifier full-bridge module has its first output terminal connected to the first terminal of the first energy storage control module and the first terminal of the second energy storage control module, its second output terminal connected to the negative terminal of the power energy storage system and the second terminal of the second energy storage control module, and its third output terminal connected to the third terminal of the second energy storage control module. The first energy storage control module includes a first inductor, a fifth switching transistor, a ninth diode, and a first energy storage capacitor. The first terminal of the first inductor is connected to the first output terminal of the rectifier full-bridge module as the first terminal of the first energy storage control module. The second terminal of the first inductor and the anode of the ninth diode are connected to the drain terminal of the fifth switching transistor. The cathode of the ninth diode and the first terminal of the first energy storage capacitor are connected to the fourth terminal of the second energy storage control module as the second terminal of the first energy storage control module. The source terminal of the fifth switching transistor and the second terminal of the first energy storage capacitor are connected to the positive terminal of the power energy storage system as the third terminal of the first energy storage control module. The first energy storage capacitor is used to introduce a voltage drop during the falling edge of the pulse to accelerate the change of the output current. The second energy storage control module includes a sixth switching transistor, a second energy storage capacitor, and a second inductor. The source terminal of the sixth switching transistor serves as the first terminal of the second energy storage control module and is connected to the first output terminal of the rectifier full-bridge module. The first terminal of the second energy storage capacitor serves as the second terminal of the second energy storage control module and is connected to the second output terminal of the rectifier full-bridge module. The first terminal of the second inductor serves as the third terminal of the second energy storage control module and is connected to the third output terminal of the rectifier full-bridge module. The second terminal of the second inductor, the drain terminal of the sixth switching transistor, and the second terminal of the second energy storage capacitor serve as the fourth terminal of the second energy storage control module and are connected to the second terminal of the first energy storage control module. The second energy storage capacitor is used to establish a high voltage during the pulse rising edge stage and apply it to the first inductor and the power-type energy storage system to increase the rise rate of the output current. The energy storage capacitors of the first and second energy storage control modules shorten the completion time of the pulse rising edge and pulse falling edge through the synergistic effect of charging and discharging, thereby enabling the circuit to quickly switch between continuous current charging mode and pulse current charging mode.

2. The full-bridge fast charging circuit for 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 and a second switch, and the second bridge arm includes a third switch and a fourth switch. The drain terminals of the first and third switching transistors are connected to the positive terminal of the DC power supply as the first input terminal of the inverter full-bridge module. The source terminals of the second and fourth switching transistors are connected to the negative terminal of the DC power supply as the second input terminal of the inverter full-bridge module. The source terminal of the first switching transistor and the drain terminal of the second switching transistor are connected to the first input terminal of the transformer module as the first output terminal of the inverter full-bridge module. The source terminal of the third switch and the drain terminal of the fourth switch are connected as the second output terminal of the inverter full-bridge module and the second input terminal of the transformer module.

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

4. The full-bridge fast charging circuit for the power-type energy storage system according to claim 1, characterized in that, The rectifier full-bridge module includes: The first full-bridge unit has its first input terminal connected to the first output terminal of the transformer module, its second input terminal connected to the second output terminal of the transformer module, its first output terminal connected to the first terminal of the first energy storage control module and the first terminal of the second energy storage control module, and its second output terminal connected to the negative terminal of the power-type energy storage system and the second terminal of the second energy storage control module. The second full-bridge unit has its first input terminal connected to the third output terminal of the transformer module, its second input terminal connected to the fourth output terminal of the transformer module, its first output terminal connected to the negative terminal of the power-type energy storage system and the second terminal of the second energy storage control module, and its second output terminal connected to the third terminal of the second energy storage control module.

5. The full-bridge fast charging circuit for 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, wherein 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 as the first input terminal of the first full-bridge unit and the first output terminal of the transformer module. The anode of the third diode and the cathode of the fourth diode are connected as the second input terminal of the first full-bridge unit and the second output terminal of the transformer module. The cathodes of the first diode and the third diode serve as the first output terminals of the first full-bridge unit and are respectively connected to the first terminal of the first energy storage control module and the first terminal of the second energy storage control module. The anodes of the second diode and the fourth diode serve as the second output terminals of the first full-bridge unit, and are respectively connected to the negative terminal of the power-type energy storage system and the second terminal of the second energy storage control module.

6. The full-bridge fast charging circuit for 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 including a fifth diode and a sixth diode, and the sixth bridge arm including 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 anodes of the fifth diode and the seventh diode serve as the first output terminal of the second full-bridge unit and are respectively connected to the negative terminal of the power-type energy storage system and the second terminal of the second energy storage control module. The cathodes of the sixth diode and the eighth diode are connected to the third terminal of the second energy storage control module as the second output terminal of the second full-bridge unit.

7. The full-bridge fast charging circuit for the power-type energy storage system according to claim 1, characterized in that, The full-bridge fast charging circuit also includes a buffer module, which includes a third inductor and a tenth diode. The first end of the third inductor is connected to the fourth end of the second energy storage control module, and the second end is connected to the cathode of the tenth diode. The anode of the tenth diode is connected to the second terminal of the first energy storage control module.

8. A charger for a power-type energy storage system, characterized in that, Includes a full-bridge fast charging circuit for a power-type energy storage system as described in any one of claims 1 to 7.

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