A half-bridge fast charging circuit and charger of a power energy storage system

Abstract

The application discloses a kind of power energy storage system's half bridge fast charging circuit and charger, the circuit includes inverter half bridge module, transformer module, first and second rectification half bridge module, first and second energy storage control module.Inverter half bridge module input end connects DC power supply, output end connects transformer module input end.Transformer module output end connects the input end of first and second rectification half bridge module and power energy storage system negative pole, and the first end of first rectification half bridge module output end connects first and second energy storage control module.The third end of second rectification half bridge module output end connects second energy storage control module.The second end of first energy storage control module fourth end connects second energy storage control module, and third end connects power energy storage system positive pole.The second end of second energy storage control module connects power energy storage system negative pole.The circuit utilizes energy storage capacitor to adjust the rising edge and falling edge of pulse current, realizes the quick conversion between continuous current charging mode and pulse current charging mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power energy storage system charging, in particular to a half-bridge fast charging circuit and charger for power energy storage system. BACKGROUND

[0002] Power energy storage system (such as an energy storage system composed of one or more combinations of power energy storage devices such as electrochemical capacitors, power lithium ion batteries, sodium ion batteries, etc.) as a kind of device with the ability to store and quickly release a large amount of energy, has a high power density, can realize efficient charging and discharging process in a very short time, and has a long service life and low maintenance cost, therefore, power energy storage system is widely used in power systems and various energy storage scenarios requiring high power output.

[0003] In the prior art, the charging method of power energy storage system mainly adopts traditional charging modes such as constant current charging, constant voltage charging and constant power charging, although these charging methods can meet the basic charging needs of power energy storage system to a certain extent, but the unique high power density advantage of power energy storage system and the ability to withstand large pulse current for fast charging and discharging in a limited time are not fully tapped and utilized. Therefore, how to fully utilize the characteristics of power energy storage system and develop efficient fast or super-fast charging technology has become a problem to be solved in the field of power energy storage system charging. SUMMARY

[0004] The purpose of the present application is to provide a half-bridge fast charging circuit and charger for power energy storage system, which introduces an energy storage capacitor, adjusts the rising edge and falling edge of the pulse current by using the energy storage capacitor, and realizes the fast conversion of the circuit between the continuous current charging mode and the pulse current charging mode, solving the problem that the fast charging and discharging characteristics of power energy storage system in the prior art are not fully utilized.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme:

[0006] The present application provides a half-bridge fast charging circuit for power energy storage system, which comprises an inverter half-bridge module, a transformer module, a first rectifier half-bridge module, a second rectifier half-bridge module, a first energy storage control module and a second energy storage control module.

[0007] The input end of the inverter half-bridge module is connected with a direct current power supply, and the output end is connected with the input end of the transformer module;

[0008] The output end of the transformer module is respectively connected with the input end of the first rectifier half-bridge module, the input end of the second rectifier half-bridge module and the negative electrode of the power energy storage system.

[0009] The output end of the first rectification half-bridge module is connected with the first end of the first energy storage control module and the first end of the second energy storage control module respectively;

[0010] The output end of the second rectification half-bridge module is connected with the third end of the second energy storage control module;

[0011] 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 pole of the power type energy storage system;

[0012] The second end of the second energy storage control module is connected with the negative pole of the power type energy storage system.

[0013] In an embodiment of the present application, the inverter half-bridge module comprises a first bridge arm and a second bridge arm;

[0014] The first bridge arm and the second bridge arm are connected between the positive pole and the negative pole of the direct current power supply;

[0015] The midpoint of the first bridge arm is connected with the first input end of the transformer module as the first output end of the inverter half-bridge module;

[0016] The midpoint of the second bridge arm is connected with the second input end of the transformer module as the second output end of the inverter half-bridge module.

[0017] In an embodiment of the present application, the first bridge arm comprises a first switch tube and a second switch tube, and the second bridge arm comprises a first capacitor and a second capacitor;

[0018] The drain end of the first switch tube and the first end of the first capacitor are connected with the positive pole of the direct current power supply;

[0019] The source end of the second switch tube and the second end of the second capacitor are connected with the negative pole of the direct current power supply;

[0020] The source end of the first switch tube and the drain end of the second switch tube are connected with the first input end of the transformer module as the midpoint of the first bridge arm;

[0021] The second end of the first capacitor and the first end of the second capacitor are connected with the second input end of the transformer module as the midpoint of the second bridge arm.

[0022] In an embodiment of the present application, the transformer module comprises a primary winding, a first secondary winding and a second secondary winding;

[0023] The same name end of the primary winding is connected with the first output end of the inverter half-bridge module as the first input end of the transformer module, and the different name end is connected with the second output end of the inverter half-bridge module as the second input end of the transformer module;

[0024] The same name end of the first secondary winding is connected with the first input end of the first rectifier half-bridge module as the first output end of the transformer module, and the different name end is connected with the second input end of the first rectifier half-bridge module as the second output end of the transformer module;

[0025] The same name end of the second secondary winding is connected with the first input end of the second rectifier half-bridge module as the third output end of the transformer module, and the different name end is connected with the second input end of the second rectifier half-bridge module as the fourth output end of the transformer module;

[0026] The center taps of the first secondary winding and the second secondary winding are connected with the negative electrode of the power type energy storage system as the fifth output end of the transformer module.

[0027] In an embodiment of the present application, the first rectifier half-bridge module comprises a first diode and a second diode;

[0028] The anode of the first diode is connected with the first output end of the transformer module as the first input end of the first rectifier half-bridge module;

[0029] The anode of the second diode is connected with the second output end of the transformer module as the second input end of the first rectifier half-bridge module;

[0030] The cathodes of the first diode and the second diode are connected with the first end of the first energy storage control module and the first end of the second energy storage control module respectively as the output end of the first rectifier half-bridge module.

[0031] In an embodiment of the present application, the second rectifier half-bridge module comprises a third diode and a fourth diode;

[0032] The anode of the third diode is connected with the third output end of the transformer module as the first input end of the second rectifier half-bridge module;

[0033] The anode of the fourth diode is connected with the fourth output end of the transformer module as the second input end of the second rectifier half-bridge module;

[0034] The cathodes of the third diode and the fourth diode are connected with the third end of the second energy storage control module as the output end of the second rectifier half-bridge module.

[0035] In one embodiment of the present application, the first energy storage control module comprises a first inductor, a third switch tube, a first energy storage capacitor and a fifth diode;

[0036] The first end of the first inductor is connected with the output end of the first rectifier half-bridge module as the first end of the first energy storage control module;

[0037] The second end of the first inductor and the drain end of the third switch tube are connected with the anode of the fifth diode;

[0038] The cathode of the fifth diode and the first end of the first energy storage capacitor are connected with the fourth end of the second energy storage control module as the second end of the first energy storage control module;

[0039] The source end of the third switch tube and the second end of the first energy storage capacitor are connected with the positive pole of the power type energy storage system as the third end of the first energy storage control module.

[0040] In one embodiment of the present application, the second energy storage control module comprises a fourth switch tube, a second energy storage capacitor and a second inductor;

[0041] The source end of the fourth switch tube is connected with the first end of the first energy storage control module as the first end of the second energy storage control module;

[0042] The first end of the second energy storage capacitor is connected with the negative pole of the power type energy storage system as the second end of the second energy storage control module;

[0043] The first end of the second inductor is connected with the output end of the second rectifier half-bridge module as the third end of the second energy storage control module;

[0044] The second end of the second energy storage capacitor, the drain end of the fourth switch tube and the second end of the second inductor are connected with the second end of the first energy storage control module as the fourth end of the second energy storage control module.

[0045] In one embodiment of the present application, the half-bridge fast charging circuit further comprises a buffer module, and the buffer module comprises a sixth diode and a third inductor;

[0046] The anode of the sixth diode is connected with the second end of the first energy storage control module, and the cathode is connected with the first end of the third inductor;

[0047] The second end of the third inductor is connected with the fourth end of the second energy storage control module.

[0048] Based on the same inventive concept, another embodiment of the present application also provides a charger for a power energy storage system, which comprises the half-bridge fast charging circuit for a power energy storage system according to any one of the above embodiments.

[0049] As described above, the present application provides a half-bridge fast charging circuit for a power energy storage system, which comprises an inverter half-bridge module, a transformer module, a first rectifier half-bridge module, a second rectifier half-bridge module, a first energy storage control module and a second energy storage control module. The input end of the inverter half-bridge module is connected with a direct current power supply, and the output end is connected with the input end of the transformer module. The output end of the transformer module is respectively connected with the input end of the first rectifier half-bridge module, the input end of the second rectifier half-bridge module and the negative electrode of the power energy storage system. The output end of the first rectifier half-bridge module is respectively connected with the first end of the first energy storage control module and the first end of the second energy storage control module. The output end of the second rectifier half-bridge module 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. The third end is connected with the positive electrode of the power energy storage system. The second end of the second energy storage control module is connected with the negative electrode of the power energy storage system. The half-bridge fast charging circuit for a power energy storage system is optimized based on the traditional half-bridge converter. The energy storage capacitor is innovatively introduced into the circuit to accurately adjust the rising edge and the falling edge of the pulse current, shorten the completion time of the pulse rising edge and the pulse falling edge, and then realize the fast and efficient conversion between the continuous current charging mode and the pulse current charging mode of the circuit, thereby improving the charging efficiency. Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0051] Figure 1 A system block diagram of a half-bridge fast charging circuit for a power energy storage system provided by an exemplary embodiment of the present application.

[0052] Figure 2 A circuit schematic diagram of a half-bridge fast charging circuit for a power energy storage system provided by an exemplary embodiment of the present application.

[0053] Figure 3A first circuit schematic diagram of a circuit provided by an example embodiment of the present application operating in a current-stabilized mode to transfer energy from a DC power source side to a power-type energy storage system side.

[0054] Figure 4 A second circuit schematic diagram of a circuit provided by an example embodiment of the present application operating in a current-stabilized mode to transfer energy from a DC power source side to a power-type energy storage system side.

[0055] Figure 5 A first circuit schematic diagram of a circuit provided by an example embodiment of the present application operating in a current-stabilized mode to charge a second energy storage control module.

[0056] Figure 6 A second circuit schematic diagram of a circuit provided by an example embodiment of the present application operating in a current-stabilized mode to charge a second energy storage control module.

[0057] Figure 7 A circuit schematic diagram of a circuit provided by an example embodiment of the present application operating in a pulse-up mode.

[0058] Figure 8 A circuit schematic diagram of a circuit provided by an example embodiment of the present application operating in a pulse-down mode.

[0059] Reference designators include the following:

[0060] 100 DC power source

[0061] 200 inverter half-bridge module

[0062] 300 transformer module

[0063] 400 first rectifier half-bridge module

[0064] 500 second rectifier half-bridge module

[0065] 600 first energy storage control module

[0066] 700 second energy storage control module

[0067] 800 buffer module

[0068] 900 power-type energy storage system DETAILED DESCRIPTION

[0069] Following, the advantages and effects of the present application can be easily understood by those skilled in the art from the description. The present application can also be implemented or applied by other different specific embodiments, and the details in the description can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following examples and features in the examples can be combined with each other without conflict.

[0070] It should be noted that the diagrams provided in the following examples only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the diagrams, not the number, shape and size of the components when actually implemented. The actual implementation of each component can be a random change, and the component layout pattern can be more complex.

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

[0072] The conventional half-bridge converter can realize the switching between the continuous current charging mode and the pulse current charging mode by regulating the working state of the switch tube, however, during the mode switching process, the average voltage across the output inductor is at a low level, which limits the rate of change of the inductor current. Specifically, when the inductor current is converted from the continuous current charging mode to the pulse current charging mode, or vice versa, the output inductor needs to experience a long energy release or accumulation process. In the energy release stage, the energy stored in the inductor needs to be gradually dissipated, and in the energy accumulation stage, the inductor needs to slowly store energy. This long energy conversion time causes significant delay in mode switching.

[0073] In order to solve the problem that the fast charging and discharging characteristics of the power type energy storage system in the prior art are not fully utilized, the present application provides a half-bridge fast charging circuit of a power type energy storage system, which is optimized based on the conventional half-bridge converter. The energy storage capacitor is innovatively introduced into the circuit, which adjusts the rising edge and falling edge of the pulse current, shortens the completion time of the pulse rising edge and the pulse falling edge, and realizes the fast conversion of the circuit between the continuous current charging mode and the pulse current charging mode.

[0074] It should be noted that the half-bridge fast charging circuit of the power energy storage system has two charging modes, namely 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, in the pulse rising edge stage, the charging current is quickly switched from the first stable current to the second stable current. In the pulse falling edge stage, the charging current is switched from the second stable current back to the first stable current. It is worth noting that during the transition of 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 can be understood that the completion time of the pulse rising edge and the pulse falling edge is limited by the specific charging circuit. The half-bridge fast charging circuit of the power energy storage system described in the present application can shorten the completion time of the pulse rising edge and the pulse falling edge as much as possible by optimizing the circuit structure, thereby achieving efficient switching between continuous current charging mode and pulse current charging mode, improving charging efficiency, and achieving fast charging or even super-fast charging. In the present embodiment, the first stable current can be set to 11A or 10A, and the second stable current can be set to 61A or 36A. Of course, in other embodiments, due to 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 refer to Figure 1 In an exemplary embodiment of the present application, the half-bridge fast charging circuit of the power energy storage system includes an inverter half-bridge module 200, a transformer module 300, a first rectifier half-bridge module 400, a second rectifier half-bridge module 500, a first energy storage control module 600, and a second energy storage control module 700. The input end of the inverter half-bridge module 200 is connected to the DC power supply 100, and the output end is connected to the input end of the transformer module 300. The output end of the transformer module 300 is connected to the input end of the first rectifier half-bridge module 400, the input end of the second rectifier half-bridge module 500, and the negative electrode of the power energy storage system 900, respectively. The output end of the first rectifier half-bridge module 400 is connected to the first end of the first energy storage control module 600 and the first end of the second energy storage control module 700, respectively. The output end of the second rectifier half-bridge module 500 is connected to the third end of the second energy storage control module 700. The second end of the first energy storage control module 600 is connected to the fourth end of the second energy storage control module 700, and the third end is connected to the positive electrode of the power energy storage system 900. The second end of the second energy storage control module 700 is connected to the negative electrode of the power energy storage system 900. It should be noted that please refer to Figure 2As shown in the figure, in the present embodiment, the power type energy storage system 900 is a high power energy storage system (HPESS) constructed based on an electrochemical capacitor.

[0076] As shown in the figure, Figure 1 and Figure 2 As shown in the figure, in an exemplary embodiment of the present application, the inverter half-bridge module 200 includes a first bridge arm and a second bridge arm. The first bridge arm and the second bridge arm are connected between the positive and negative poles of the DC power supply 100, the midpoint of the first bridge arm is connected to the first input end of the transformer module 300 as the first output end of the inverter half-bridge module 200, and the midpoint of the second bridge arm is connected to the second input end of the transformer module 300 as the second output end of the inverter half-bridge module 200. It should be noted that in the present embodiment, the inverter half-bridge module is used to convert DC input into high-frequency AC signal.

[0077] As shown in the figure, Figure 1 and Figure 2 As shown in the figure, 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 first capacitor C1 and a second capacitor C2. The drain of the first switch tube S1 and the first end of the first capacitor C1 are connected to the positive pole of the DC power supply 100, the source of the second switch tube S2 and the second end of the second capacitor C2 are connected to the negative pole of the DC power supply 100, the source of the first switch tube S1 and the drain of the second switch tube S2 are connected to the first input end of the transformer module 300 as the midpoint of the first bridge arm, and the second end of the first capacitor C1 and the first end of the second capacitor C2 are connected to the second input end of the transformer module 300 as the midpoint of the second bridge arm. It should be noted that in the present embodiment, the switch tube is MOSFET, of course, in other embodiments, the switch tube can also be IGBT, etc.

[0078] As shown in the figure, Figure 1 and Figure 2As shown, in an example 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. The same name end of the primary winding n1 is connected with the first output end of the inverter half-bridge module 200 as the first input end of the transformer module 300, and the different name end is connected with the second output end of the inverter half-bridge module 200 as the second input end of the transformer module 300. The same name end of the first secondary winding n2 is connected with the first input end of the first rectifier half-bridge module 400 as the first output end of the transformer module 300, and the different name end is connected with the second input end of the first rectifier half-bridge module 400 as the second output end of the transformer module 300. The same name end of the second secondary winding n3 is connected with the first input end of the second rectifier half-bridge module 500 as the third output end of the transformer module 300, and the different name end is connected with the second input end of the second rectifier half-bridge module 500 as the fourth output end of the transformer module 300. The center tap of the first secondary winding n2 and the second secondary winding n3 is connected with the negative electrode of the power energy storage system 900 as the fifth output end of the transformer module 300. It should be noted that in the present embodiment, the transformer module 300 is used to realize electrical isolation and voltage conversion.

[0079] Please continue to see Figure 1 and Figure 2 As shown, in an example embodiment of the present application, the first rectifier half-bridge module 400 includes a first diode D1 and a second diode D2. The anode of the first diode D1 is connected with the first output end of the transformer module 300 as the first input end of the first rectifier half-bridge module 400, and the anode of the second diode D2 is connected with the second output end of the transformer module 300 as the second input end of the first rectifier half-bridge module 400. The cathodes of the first diode D1 and the second diode D2 are respectively connected with the first end of the first energy storage control module 600 and the first end of the second energy storage control module 700 as the output end of the first rectifier half-bridge module 400.

[0080] Please continue to see Figure 1 and Figure 2As shown in the example embodiment of the present application, the second rectifying half-bridge module 500 includes a third diode D3 and a fourth diode D4. The anode of the third diode D3 is connected to the third output end of the transformer module 300 as the first input end of the second rectifying half-bridge module 500, the anode of the fourth diode D4 is connected to the fourth output end of the transformer module 300 as the second input end of the second rectifying half-bridge module 500, and the cathodes of the third diode D3 and the fourth diode D4 are connected to the third end of the second energy storage control module 700 as the output end of the second rectifying half-bridge module 500.

[0081] Please continue to refer to Figure 1 and Figure 2 As shown in the example embodiment of the present application, the first energy storage control module 600 includes a first inductor L o , a third switch tube S3, a first energy storage capacitor C f , and a fifth diode D5. The first end of the first inductor L o is connected to the output end of the first rectifying half-bridge module 400 as the first end of the first energy storage control module 600, the second end of the first inductor L o and the drain end of the third switch tube S3 are connected to the anode of the fifth diode D5, the cathode of the fifth diode D5 and the first end of the first energy storage capacitor C f are connected to the fourth end of the second energy storage control module 700 as the second end of the first energy storage control module 600, the source end of the third switch tube S3 and the second end of the first energy storage capacitor C f are connected to the positive electrode of the power-type energy storage system 900 as the third end of the first energy storage control module 600. It should be noted that in the present embodiment, the first inductor L o is an output inductor, the first energy storage capacitor C f is a pulse rising energy storage capacitor, and the fifth diode D5 functions as an anti-reverse diode when the circuit is in a pulse rising mode and as a freewheeling diode when the circuit is in a pulse falling mode.

[0082] Please continue to refer to Figure 1 and Figure 2 As shown in the example embodiment of the present application, the second energy storage control module 700 includes a fourth switch tube S4, a second energy storage capacitor C r , and a second inductor L c . The source end of the fourth switch tube S4 is connected to the first end of the first energy storage control module 600 as the first end of the second energy storage control module 700, the second end of the second energy storage capacitor C rthe first end of the second energy storage inductor L c the first end of the second energy storage capacitor C r the second end of the fourth switch S4, the drain end of the fourth switch S4, and the second end of the second energy storage inductor L c the second end of the second energy storage capacitor C r is a pulse drop energy storage capacitor.

[0083] Please continue to refer to Figure 1 and Figure 2 In an exemplary embodiment of the present application, the half-bridge fast charging circuit further comprises a buffer module 800, which comprises a sixth diode D6 and a third energy storage inductor L b The anode of the sixth diode D6 is connected to the second end of the first energy storage control module 600, and the cathode is connected to the first end of the third energy storage inductor L b The second end of the third energy storage inductor L b is connected to the fourth end of the second energy storage control module 700. It should be noted that in this embodiment, the third energy storage inductor L b is a buffer inductor.

[0084] The working principle of the half-bridge fast charging circuit of the power energy storage system will be described in detail as follows:

[0085] When the circuit is in a steady-state current mode operating state, that is, the output current is stably maintained at the peak level of continuous current or pulse current, and there is no need for mutual transition between continuous current and pulse current, its working principle is similar to that of a conventional half-bridge converter. Specifically, please refer to Figure 1 When the first switch S1 is in an on state, a forward voltage is applied to the primary side of the transformer, and at this moment the first diode D1 on the secondary side of the transformer is in a forward conducting state, thereby realizing energy transfer from the primary side to the secondary side of the transformer. Next, please refer to Figure 2As shown, when the second switch S2 is in the on state, a reverse voltage is applied to the primary side of the transformer, at this moment the second diode D2 on the secondary side of the transformer is on, thereby achieving energy transfer from the primary side of the transformer to the secondary side of the transformer. It should be noted that by precisely regulating the duty cycle of the switch (S1, S2) driving signal in the inverter half-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 energy storage system 900.

[0086] To achieve rapid switching from continuous current charging mode to pulse current charging mode, a specific high voltage r is established and maintained on the second energy storage capacitor C wherein, is equal to Specifically, please refer to Figure 3 and Figure 4 As shown, when the voltage of the second energy storage capacitor C r is less than , the charging circuit, while charging the power energy storage system 900, also charges the second energy storage capacitor C r in a double output structure, until the voltage of the second energy storage capacitor C r reaches

[0087] For a half-bridge converter, when its working state needs to be switched from continuous current charging mode to pulse current charging mode, the rising rate of the output current can be represented as:

[0088]

[0089] When the circuit is in pulse rising mode, please refer to Figure 5 As shown, the third switch S3 and the fourth switch S4 are in the on state, assuming that the circuit has been working in a stable state, the high voltage established on the second energy storage capacitor C r is applied to the first inductor L o and the high-power energy storage system HPESS, assuming that the voltage of the second energy storage capacitor C r does not change during the pulse rising process, the rising rate of the output current can be represented as:

[0090]

[0091] wherein, Therefore, compared with traditional half-bridge converters, the half-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 sixth diode D6 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.

[0092] For a half-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:

[0093]

[0094] When the circuit is operating in pulse fall mode, please refer to [link / reference]. Figure 6 Figure 7 Figure 8 As shown, the first switch S1 to the fourth switch S4 are all in the off state, and the first energy storage capacitor C f This introduces a larger voltage drop and accelerates the transition of the output current:

[0095]

[0096] 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 sixth diode D6 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.

[0097] In summary, the power energy storage system's half-bridge fast charging circuit provided by the application comprises an inverter half-bridge module 200, a transformer module 300, a first rectifier half-bridge module 400, a second rectifier half-bridge module 500, a first energy storage control module 600 and a second energy storage control module 700. The input end of the inverter half-bridge module 200 is connected with a direct current power supply 100, and the output end is connected with the input end of the transformer module 300. The output end of the transformer module 300 is respectively connected with the input end of the first rectifier half-bridge module 400, the input end of the second rectifier half-bridge module 500 and the negative electrode of a power energy storage system 900. The output end of the first rectifier half-bridge module 400 is respectively connected with the first end of the first energy storage control module 600 and the first end of the second energy storage control module 700. The output end of the second rectifier half-bridge module 500 is connected with the third end of the second energy storage control module 700. The second end of the first energy storage control module 600 is connected with the fourth end of the second energy storage control module 700. The third end is connected with the positive electrode of the power energy storage system 900. The second end of the second energy storage control module 700 is connected with the negative electrode of the power energy storage system 900. The power energy storage system's half-bridge fast charging circuit is optimized based on the traditional half-bridge converter. The energy storage capacitor is innovatively introduced into the circuit. The rising edge and the falling edge of the pulse current are accurately adjusted by using the energy storage capacitor. The completion time of the pulse rising edge and the pulse falling edge is shortened. The fast and efficient conversion between the continuous current charging mode and the pulse current charging mode of the circuit is realized. The charging efficiency is improved.

[0098] Based on the same inventive concept, another embodiment of the application also provides a power energy storage system charger, which comprises the power energy storage system's half-bridge fast charging circuit of any of the above-mentioned embodiments. Since the power energy storage system charger provided by the embodiment belongs to the same inventive concept as the power energy storage system's half-bridge fast charging circuit provided by any of the above-mentioned embodiments, it at least has the same beneficial effects, which will not be described here.

[0099] The above-mentioned embodiments only exemplarily illustrate the principles and effects of the application, but are not used to limit the application. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and category of the application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the application should be covered by the claims of the application.

Claims

1. A half-bridge fast charging circuit for a power energy storage system, characterized by, The application relates to a power supply system, which comprises an inverter half-bridge module, a transformer module, a first rectifier half-bridge module, a second rectifier half-bridge module, a first energy storage control module and a second energy storage control module. The input end of the inverter half-bridge module is connected with a direct-current 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 first rectifier half-bridge module, the input end of the second rectifier half-bridge module and the negative pole of a power-type energy storage system respectively. The output end of the first rectifier half-bridge module is connected with the first end of the first energy storage control module and the first end of the second energy storage control module respectively. The output end of the second rectifier half-bridge module 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 pole of the power-type energy storage system. The second end of the second energy storage control module is connected with the negative pole of the power-type energy storage system. The first energy storage control module comprises a first inductor, a third switch tube, a first energy storage capacitor and a fifth diode, the first end of the first inductor is connected with the output end of the first rectifier half-bridge module as the first end of the first energy storage control module, the second end of the first inductor and the drain end of the third switch tube are connected with the anode of the fifth diode, the cathode of the fifth diode and the first end of the first energy storage capacitor are connected with the fourth end of the second energy storage control module as the second end of the first energy storage control module, the source end of the third switch tube and the second end of the first energy storage capacitor are connected with the positive pole of the power-type energy storage system as the third end of the first energy storage control module; in a pulse drop mode, the first energy storage capacitor is connected to the circuit to introduce a voltage drop, thereby accelerating the charging current to drop from a second stable current to a first stable current. The second energy storage control module comprises a fourth switch tube, a second energy storage capacitor and a second inductor, the source end of the fourth switch tube is connected with the first end of the first energy storage control module as the first end of the second energy storage control module, the first end of the second energy storage capacitor is connected with the negative pole of the power-type energy storage system as the second end of the second energy storage control module, the first end of the second inductor is connected with the output end of the second rectifier half-bridge module as the third end of the second energy storage control module, the second end of the second energy storage capacitor, the drain end of the fourth switch tube and the second end of the second inductor are connected with the second end of the first energy storage control module as the fourth end of the second energy storage control module; in a pulse rise mode, the third switch tube and the fourth switch tube are turned on, so that the high voltage established on the second energy storage capacitor in a current stable mode is applied to the first inductor and the power-type energy storage system, thereby accelerating the charging current to rise from the first stable current to the second stable current. The inverter half-bridge module comprises a first bridge arm and a second bridge arm.

2. The half bridge fast charge circuit for a power-based energy storage system of claim 1, wherein, The first bridge arm and the second bridge arm are connected in parallel between the positive pole and the negative pole of the direct-current power supply. ​ The midpoint of the first bridge arm is connected with the first input end of the transformer module as the first output end of the inverter half-bridge module; The midpoint of the second bridge arm is connected with the second input end of the transformer module as the second output end of the inverter half-bridge module.

3. The half bridge fast charge circuit for a power-based energy storage system of claim 2, wherein, The first bridge arm comprises a first switch tube and a second switch tube, and the second bridge arm comprises a first capacitor and a second capacitor; The drain end of the first switch tube and the first end of the first capacitor are connected with the positive pole of a direct current power supply; The source end of the second switch tube and the second end of the second capacitor are connected with the negative pole of the direct current power supply; The source end of the first switch tube and the drain end of the second switch tube are connected with the first input end of the transformer module as the midpoint of the first bridge arm; The second end of the first capacitor and the first end of the second capacitor are connected with the second input end of the transformer module as the midpoint of the second bridge arm.

4. The half bridge fast charge circuit for a power-based energy storage system of claim 1, wherein, The transformer module comprises a primary winding, a first secondary winding and a second secondary winding; The same name end of the primary winding is connected with the first output end of the inverter half-bridge module as the first input end of the transformer module, and the different name end is connected with the second output end of the inverter half-bridge module as the second input end of the transformer module; The same name end of the first secondary winding is connected with the first input end of the first rectifier half-bridge module as the first output end of the transformer module, and the different name end is connected with the second input end of the first rectifier half-bridge module as the second output end of the transformer module; The same name end of the second secondary winding is connected with the first input end of the second rectifier half-bridge module as the third output end of the transformer module, and the different name end is connected with the second input end of the second rectifier half-bridge module as the fourth output end of the transformer module; The center tap of the first secondary winding and the second secondary winding is connected with the negative pole of the power type energy storage system as the fifth output end of the transformer module.

5. The half bridge fast charge circuit for a power-based energy storage system of claim 1, wherein, The first rectifier half-bridge module comprises a first diode and a second diode; The anode of the first diode is connected with the first output end of the transformer module as the first input end of the first rectifier half-bridge module; The anode of the second diode is connected with the second output end of the transformer module as the second input end of the first rectifier half-bridge module; The cathodes of the first diode and the second diode are connected with the first end of the first energy storage control module and the first end of the second energy storage control module respectively as the output end of the first rectifier half-bridge module.

6. The half bridge fast charge circuit for a power-based energy storage system of claim 1, wherein, The second rectifier half-bridge module comprises a third diode and a fourth diode; The anode of the third diode is connected with the third output end of the transformer module as the first input end of the second rectifier half-bridge module; The anode of the fourth diode is connected with the fourth output end of the transformer module as the second input end of the second rectifier half-bridge module; The cathodes of the third diode and the fourth diode are connected with the third end of the second energy storage control module as the output end of the second rectifier half-bridge module.

7. The half bridge fast charge circuit for a power-based energy storage system of claim 1, wherein, The half-bridge fast charging circuit further comprises a buffer module, and the buffer module comprises a sixth diode and a third inductor; An anode of the sixth diode is connected with a second end of the first energy storage control module, and a cathode is connected with a first end of the third inductor; A second end of the third inductor is connected with a fourth end of the second energy storage control module.

8. A charger for a power-type energy storage system, characterized by, A half-bridge fast charging circuit comprising the power type energy storage system according to any one of claims 1 to 7.

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