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

Abstract

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

Description

Technical Field

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

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

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

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

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

[0006] The present invention provides a half-bridge fast charging circuit for a power type 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 to the DC power supply, and the output end is connected to the input end of the transformer module;

[0008] The output end of the transformer module is respectively connected to 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 type energy storage system;

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

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

[0011] The second end of the first energy storage control module is connected to the fourth end of the second energy storage control module, and the third end is connected to the positive electrode of the power type energy storage system;

[0012] The second end of the second energy storage control module is connected to the negative electrode of the power-type energy storage system.

[0013] In one embodiment of the present invention, the inverter half-bridge module includes a first bridge arm and a second bridge arm;

[0014] The first bridge arm and the second bridge arm are connected in parallel between the positive electrode and the negative electrode of the DC power supply;

[0015] The midpoint of the first bridge arm is connected to 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 serves as the second output end of the inverter half-bridge module and is connected to the second input end of the transformer module.

[0017] In one embodiment of the present invention, the first bridge arm includes a first switch tube and a second switch tube, and the second bridge arm includes 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 to the positive electrode of the DC power supply;

[0019] The source terminal of the second switch tube and the second terminal of the second capacitor are connected to the negative electrode of the DC power supply;

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

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

[0022] In one embodiment of the present invention, the transformer module includes a primary winding, a first secondary winding, and a second secondary winding;

[0023] The same-name end of the primary winding is connected to the first output end of the inverter half-bridge module as the first input end of the transformer module, and the opposite-name end is connected to 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 to the first input end of the first rectifier half-bridge module as the first output end of the transformer module, and the opposite-name end is connected to 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 to the first input end of the second rectifier half-bridge module as the third output end of the transformer module, and the opposite-name end is connected to 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 serve as the fifth output end of the transformer module and are connected to the negative electrode of the power-type energy storage system.

[0027] In one embodiment of the present invention, the first rectifier half-bridge module includes a first diode and a second diode;

[0028] The anode of the first diode is connected to 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 to 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 serve as output ends of the first rectifier half-bridge module and are connected to the first end of the first energy storage control module and the first end of the second energy storage control module respectively.

[0031] In one embodiment of the present invention, the second rectifier half-bridge module includes a third diode and a fourth diode;

[0032] The anode of the third diode is connected to 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 to 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 to 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 invention, the first energy storage control module includes 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 to 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 to 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 as the second end of the first energy storage control module and the fourth end of the second 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 to the positive electrode 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 invention, the second energy storage control module includes a fourth switch tube, a second energy storage capacitor and a second inductor;

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

[0042] The first end of the second energy storage capacitor is connected to the negative electrode 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 to 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 to 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 invention, the half-bridge fast charging circuit further includes a buffer module, and the buffer module includes a sixth diode and a third inductor;

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

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

[0048] Based on the same inventive concept, another embodiment of the present invention further provides a charger for a power-type energy storage system, wherein the charger includes a half-bridge fast charging circuit for a power-type energy storage system as described in any of the above embodiments.

[0049] As described above, the present invention provides a half-bridge fast charging circuit for a power-type energy storage system, comprising 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 to a DC power supply, and the output end is connected to the input end of the transformer module. The output end of the transformer module is respectively connected to 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-type energy storage system. The output end of the first rectifier half-bridge module is respectively connected to the first end of the first energy storage control module and the first end of the second energy storage control module. The output end of the second rectifier half-bridge module is connected to the third end of the second energy storage control module. The second end of the first energy storage control module is connected to the fourth end of the second energy storage control module, the third end is connected to the positive electrode of the power-type energy storage system, and the second end of the second energy storage control module is connected to the negative electrode of the power-type energy storage system. The half-bridge fast-charging circuit of this power-type energy storage system is optimized based on the traditional half-bridge converter. It innovatively introduces energy storage capacitors into the circuit, using them to precisely adjust 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 quickly and efficiently switch between continuous current charging mode and pulse current charging mode, thereby improving charging efficiency. Of course, any product implementing the present invention does not necessarily need to achieve all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

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

[0053] Figure 3A first circuit diagram of an exemplary embodiment of the present application provides a circuit operating in a current stabilization mode to transfer energy from a DC power supply side to a power-type energy storage system side.

[0054] Figure 4 A second circuit diagram of an exemplary embodiment of the present application provides a circuit operating in a current stabilization mode to transfer energy from a DC power supply side to a power-type energy storage system side.

[0055] Figure 5 This is a first circuit diagram of an exemplary embodiment of the present application, in which a circuit operates in a current stabilization mode to charge a second energy storage control module.

[0056] Figure 6 A second circuit diagram of an exemplary embodiment of the present application provides a circuit operating in a current stabilization mode to charge a second energy storage control module.

[0057] Figure 7 A circuit diagram of an exemplary embodiment of the present application showing a circuit operating in a pulse rising mode.

[0058] Figure 8 A circuit diagram of an exemplary embodiment of the present application showing a circuit operating in a pulse-down mode.

[0059] The reference numerals are as follows:

[0060] 100 DC power supply

[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 Energy Storage System DETAILED DESCRIPTION

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

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

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

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

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

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

[0075] See also Figure 1 As shown, in an exemplary embodiment of the present application, the half-bridge fast charging circuit of the power-type 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 respectively 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-type energy storage system 900. The output end of the first rectifier half-bridge module 400 is respectively 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. 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 thereof is connected to the positive electrode of the power type energy storage system 900. The second end of the second energy storage control module 700 is connected to the negative electrode of the power type energy storage system 900. Figure 2As shown, in this embodiment, the power energy storage system 900 is a high power energy storage system (HPESS) constructed based on electrochemical capacitors.

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

[0077] See also Figure 1 and Figure 2 As shown, in an exemplary embodiment of the present application, the first bridge arm includes a first switch transistor S1 and a second switch transistor S2, and the second bridge arm includes a first capacitor C1 and a second capacitor C2. The drain terminal of the first switch transistor S1 and the first end of the first capacitor C1 are connected to the positive electrode of the DC power supply 100, the source terminal of the second switch transistor S2 and the second end of the second capacitor C2 are connected to the negative electrode of the DC power supply 100, the source terminal of the first switch transistor S1 and the drain terminal of the second switch transistor S2 serve as the midpoint of the first bridge arm and are connected to the first input terminal of the transformer module 300, and the second end of the first capacitor C1 and the first end of the second capacitor C2 serve as the midpoint of the second bridge arm and are connected to the second input terminal of the transformer module 300. It should be noted that in this embodiment, the switch transistor is a MOSFET. Of course, in other embodiments, the switch transistor may also be an IGBT or the like.

[0078] Please continue reading Figure 1 and Figure 2As shown, in an exemplary embodiment of the present application, the transformer module 300 includes a primary winding n1, a first secondary winding n2, and a second secondary winding n3. The same-name end of the primary winding n1 is connected to the first output end of the inverter half-bridge module 200 as the first input end of the transformer module 300, and the opposite-name end is connected to 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 to the first input end of the first rectifier half-bridge module 400 as the first output end of the transformer module 300, and the opposite-name end is connected to the second input end of the first rectifier half-bridge module 400 as the second output end of the transformer module 300. The like-name end of the second secondary winding n3 is connected to the first input end of the second rectifier half-bridge module 500 as the third output end of the transformer module 300, and the opposite-name end is connected to the second input end of the second rectifier half-bridge module 500 as the fourth output end of the transformer module 300. The center taps of the first secondary winding n2 and the second secondary winding n3 are connected to 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 this embodiment, the transformer module 300 is used to achieve electrical isolation and voltage conversion.

[0079] Please continue reading Figure 1 and Figure 2 As shown, in an exemplary 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 to the first output terminal of the transformer module 300 as the first input terminal of the first rectifier half-bridge module 400, the anode of the second diode D2 is connected to the second output terminal of the transformer module 300 as the second input terminal of the first rectifier half-bridge module 400, and the cathodes of the first diode D1 and the second diode D2 are connected to the first terminal of the first energy storage control module 600 and the first terminal of the second energy storage control module 700, respectively, as the output terminals of the first rectifier half-bridge module 400.

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

[0081] Please continue reading Figure 1 and Figure 2 As shown, in an exemplary embodiment of the present application, the first energy storage control module 600 includes a first inductor L o , the third switch tube S3, the first energy storage capacitor C f and a fifth diode D5. The first inductor L o The first end of the first energy storage control module 600 is connected to the output end of the first rectifier half-bridge module 400, and the first inductor L o The second end of the first switching transistor S3 and the drain end of the third switching transistor S3 are connected to the anode of the fifth diode D5, and the cathode of the fifth diode D5 and the first energy storage capacitor C f The first 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 source end of the third switch tube S3 and the first energy storage capacitor C f The second end of is 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 this embodiment, the first inductor L o is the output inductor, the first energy storage capacitor C f It is a pulse rising energy storage capacitor. The fifth diode D5 serves as an anti-reverse diode when the circuit is in the pulse rising mode, and serves as a freewheeling diode when the circuit is in the pulse falling mode.

[0082] Please continue reading Figure 1 and Figure 2 As shown, in an exemplary 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 the 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, and the second energy storage capacitor C rThe first end of the second energy storage control module 700 is connected to the negative electrode of the power type energy storage system 900, and the second inductor L c The first end of the second energy storage control module 700 is connected to the output end of the second rectifier half-bridge module 500, and the second energy storage capacitor C r The second end of the fourth switch tube S4 and the drain end of the second inductor L c The second end of the second energy storage control module 700 is connected to the second end of the first energy storage control module 600. It should be noted that, in this embodiment, the second energy storage capacitor C r It is the pulse drop energy storage capacitor.

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

[0084] The following is a detailed introduction to the working principle of the half-bridge fast charging circuit of the power-type energy storage system:

[0085] When the circuit is in steady-state current mode operation, that is, when the output current is stably maintained at the peak level of continuous current or pulse current, and there is no need to transition between continuous current and pulse current, its working principle is similar to that of a traditional half-bridge converter. Figure 3 As shown, when the first switch tube S1 is in the on state, a forward voltage will be applied to the primary side of the transformer. At this moment, the first diode D1 on the secondary side of the transformer is in the forward conduction state, thereby realizing the transfer of energy from the primary side of the transformer to the secondary side of the transformer. Figure 4As 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 turned 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 controlling the duty cycle of the drive signal of the switch tubes (S1, S2) 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 storage system 900.

[0086] In order to realize the rapid conversion from continuous current charging mode to pulse current charging mode, the second energy storage capacitor C r Establish and maintain a specific high voltage in, equal Specifically, see Figure 5 and Figure 6 As shown, when the second energy storage capacitor C r The voltage is less than When the charging circuit is charging the power type energy storage system 900, the dual output structure it adopts will also charge the second energy storage capacitor C r Charge until the second energy storage capacitor C r The voltage reaches

[0087] For a half-bridge converter, when its operating state needs to switch from continuous current charging mode to pulse current charging mode, the rate of increase of its output current can be expressed as:

[0088]

[0089] When the circuit is in pulse rising mode operation, refer to Figure 7 As shown, the third switch tube S3 and the fourth switch tube S4 are in the on state. Assuming that the circuit has been working in a stable state, the current stabilization mode is based on the second energy storage capacitor C r High voltage on Applied to the first inductor L o And high power energy storage system HPESS, assuming that during the pulse rising process the second energy storage capacitor C r If the voltage remains unchanged, the output current rising rate can be expressed as:

[0090]

[0091] in, Therefore, compared with the traditional half-bridge converter, the half-bridge fast charging circuit of the present invention can achieve a faster conversion from continuous current to pulse current. After the conversion is completed, it switches to the current stabilization mode to ensure the stability and reliability of the charging process. It should be noted that in this process, the second energy storage capacitor C r The voltage of the first energy storage capacitor C f The stored energy is transferred 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 realize 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 in pulse-down mode operation, refer to Figure 8 As shown, the first switch tube S1 to the fourth switch tube S4 are all in the off state, and the first energy storage capacitor C f Introduces a larger voltage drop and accelerates the transition of output current:

[0095]

[0096] in, Similarly, when the conversion is completed, it switches to the current stabilization mode to ensure the stability and reliability of the charging process. f The voltage of the first energy storage capacitor C f The energy will pass through the 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 realize the redistribution and utilization of energy.

[0097] In summary, the present invention provides a half-bridge fast charging circuit for a power-type energy storage system, including 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 respectively 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 pole of the power-type energy storage system 900. The output end of the first rectifier half-bridge module 400 is respectively 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. 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 pole of the power-type energy storage system 900. The second end of the second energy storage control module 700 is connected to the negative pole of the power-type energy storage system 900. The half-bridge fast charging circuit of the power energy storage system is optimized based on the traditional half-bridge converter. It innovatively introduces energy storage capacitors into the circuit, which are used to accurately adjust the rising and falling edges of the pulse current, shortening the completion time of the pulse rising and falling edges, thereby realizing fast and efficient conversion of the circuit between continuous current charging mode and pulse current charging mode, thereby improving charging efficiency.

[0098] Based on the same inventive concept, another embodiment of the present invention further provides a charger for a power-type energy storage system, comprising the half-bridge fast-charging circuit for a power-type energy storage system described in any of the above embodiments. Because the charger for a power-type energy storage system provided in this embodiment shares the same inventive concept as the half-bridge fast-charging circuit for a power-type energy storage system provided in any of the above embodiments, and therefore, each of these components has at least the same beneficial effects, they will not be further detailed herein.

[0099] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

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

2. The half-bridge fast charging circuit of the power type energy storage system according to claim 1, characterized in that: The inverter half-bridge module 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 electrode and the negative electrode of the DC power supply; The midpoint of the first bridge arm is connected to 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 serves as the second output end of the inverter half-bridge module and is connected to the second input end of the transformer module.

3. The half-bridge fast charging circuit of the power type energy storage system according to claim 2, characterized in that: The first bridge arm includes a first switch tube and a second switch tube, and the second bridge arm includes 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 to the positive electrode of the DC power supply; The source terminal of the second switch tube and the second terminal of the second capacitor are connected to the negative electrode of the DC power supply; The source end of the first switch tube and the drain end of the second switch tube are connected to the first input end of the transformer module as the midpoint of the first bridge arm; The second end of the first capacitor and the first end of the second capacitor are connected to the second input end of the transformer module as the midpoint of the second bridge arm.

4. The half-bridge fast charging circuit of the power type energy storage system according to claim 1, characterized in that: The transformer module includes a primary winding, a first secondary winding and a second secondary winding; The same-name end of the primary winding is connected to the first output end of the inverter half-bridge module as the first input end of the transformer module, and the opposite-name end is connected to 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 to the first input end of the first rectifier half-bridge module as the first output end of the transformer module, and the opposite-name end is connected to 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 to the first input end of the second rectifier half-bridge module as the third output end of the transformer module, and the opposite-name end is connected to the second input end of the second rectifier half-bridge module as the fourth output end of the transformer module; The center taps of the first secondary winding and the second secondary winding serve as the fifth output end of the transformer module and are connected to the negative electrode of the power-type energy storage system.

5. The half-bridge fast charging circuit of the power type energy storage system according to claim 1, characterized in that: The first rectifier half-bridge module includes a first diode and a second diode; The anode of the first diode is connected to 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 to 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 serve as output ends of the first rectifier half-bridge module and are connected to the first end of the first energy storage control module and the first end of the second energy storage control module respectively.

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

8. The half-bridge fast charging circuit of the power type energy storage system according to claim 1, characterized in that: The second energy storage control module includes a fourth switch tube, a second energy storage capacitor and a second inductor; The source end of the fourth switch tube serves as the first end of the second energy storage control module and is connected to the first end of the first energy storage control module; The first end of the second energy storage capacitor is connected to the negative electrode 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 to 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 to the second end of the first energy storage control module as the fourth end of the second energy storage control module.

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

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

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