CN220822668U - Charging and discharging circuit and energy storage inverter based on bidirectional CLLC topology - Google Patents
Charging and discharging circuit and energy storage inverter based on bidirectional CLLC topology Download PDFInfo
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- CN220822668U CN220822668U CN202322488314.8U CN202322488314U CN220822668U CN 220822668 U CN220822668 U CN 220822668U CN 202322488314 U CN202322488314 U CN 202322488314U CN 220822668 U CN220822668 U CN 220822668U
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- 238000004146 energy storage Methods 0.000 title claims abstract description 37
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 11
- 238000007599 discharging Methods 0.000 title abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 42
- 239000003990 capacitor Substances 0.000 claims description 25
- 238000002955 isolation Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The application discloses a charge-discharge circuit and an energy storage inverter based on a bidirectional CLLC topology. The charge-discharge circuit includes: the device comprises an energy storage module, a first conversion circuit, a transformer module and a second conversion circuit; the energy storage module is provided with a positive electrode end and a negative electrode end, the transformer module comprises at least 2 transformers, 2 primary coils of the transformers are electrically connected in parallel, the primary coils are electrically connected with a primary circuit, 2 secondary coils of the transformers are electrically connected in series, the secondary coils are electrically connected with a secondary circuit, the primary circuit is connected with the positive electrode end and the negative electrode end of the energy storage module, the secondary circuit is electrically connected with a second conversion circuit, and the second conversion circuit is electrically connected with the direct current module. When the charging and discharging circuit is in a discharging state, the primary circuit is opened in a staggered mode, so that the voltage peak value of the input voltage of the transformer module is doubled, and when the charging and discharging circuit is in a charging state, the primary and secondary stages can be better used for reducing the voltage and rectifying to charge the energy storage module. By the design, the utilization efficiency of electric energy is improved.
Description
Technical Field
The application relates to the technical field of new energy, in particular to a charge-discharge circuit and an energy storage inverter based on a bidirectional CLLC topology.
Background
The bi-directional isolated DC/DC converter topology is largely divided into DAB (dual active bridge, double active full bridge) converters and CLLC resonant converters (CLLC Resonant Converter). The CLLC converter has the characteristics of small turn-off current, small working circulation, easy realization of soft switch and the like, and is widely applied. However, in the conventional CLLC converter, when the CLLC converter is used for voltage conversion in a low voltage (e.g., 48V), the conversion efficiency of the voltage is low, and the CLLC converter is accompanied by a magnetic bias defect.
Disclosure of utility model
To overcome the above drawbacks, the present application aims to: a charge-discharge circuit and an energy storage inverter based on a bidirectional CLLC topology are provided.
In order to achieve the above purpose, the application adopts the following technical scheme:
A charge-discharge circuit based on a bi-directional CLLC topology, comprising:
The device comprises an energy storage module, a first conversion circuit, a transformer module and a second conversion circuit;
the energy storage module has a positive terminal and a negative terminal,
The transformer module comprises at least 2 transformers,
The primary coils of the 2 transformers are electrically connected in parallel and electrically connected with the first conversion circuit,
The secondary coils of the 2 transformers are electrically connected in series and electrically connected with the second conversion circuit,
The first conversion circuit is electrically connected with the positive electrode end and the negative electrode end of the energy storage module,
The second conversion circuit is electrically connected with the direct current module. The conversion efficiency of the charge-discharge circuit is improved by such design. The second conversion circuit is electrically connected with a bus of the photovoltaic module.
Preferably, the first conversion circuit comprises a first MOS switch, a second MOS switch, a third MOS switch and a fourth MOS switch, the triggering ends of the first MOS switch, the second MOS switch, the third MOS switch and the fourth MOS switch are respectively and electrically connected to the control module,
The first pole of the first MOS switch is electrically connected to the first pole of the third MOS switch and the positive pole end,
The second pole of the first MOS switch is electrically connected to the first pole of the second MOS switch,
The second pole of the third MOS switch is electrically connected to the first pole of the fourth MOS switch,
The second pole of the fourth MOS switch is electrically connected to the second pole of the third MOS switch and the negative pole terminal,
A first connection point a between the second pole of the first MOS switch and the first pole of the second MOS switch and a second connection point a between the second pole of the second MOS switch
And a second connection point b between the second pole of the third MOS switch and the first pole of the fourth MOS switch is respectively and electrically connected to the first conversion circuit.
Preferably, the second converting circuit includes a fifth MOS switch, a sixth MOS switch, a seventh MOS switch and an eighth MOS switch,
The triggering ends of the fifth MOS switch, the sixth MOS switch, the seventh MOS switch and the eighth MOS switch are respectively and electrically connected to the control module,
The first pole of the fifth MOS switch is electrically connected to the first pole of the seventh MOS switch and the positive pole of the DC module,
The second pole of the fifth MOS switch is electrically connected to the first pole of the sixth MOS switch,
The second pole of the seventh MOS switch is electrically connected to the first pole of the eighth MOS switch,
The second pole of the seventh MOS switch is electrically connected to the second pole of the eighth MOS switch and the negative pole of the DC module,
Third connection point c between second pole of fifth MOS switch and first pole of sixth MOS switch and its connection point
And a fourth connection point d between the second pole of the seventh MOS switch and the first pole of the eighth MOS switch is respectively and electrically connected to the transformer module.
Preferably, a capacitor is arranged on the path of the fourth connection point d to the secondary circuit, said capacitor being used for high-frequency isolated rectification.
Preferably, the capacitor comprises a first capacitor and a second capacitor, and the first capacitor and the second capacitor are electrically connected in parallel.
Preferably, the transformer module is an integrated transformer module.
Preferably, the energy storage module comprises a supercapacitor.
Preferably, the energy storage module comprises at least one battery module.
Preferably, the voltage of the energy storage module is between 40V and 80V.
The embodiment of the application provides an energy storage inverter which is provided with the charge-discharge circuit based on the bidirectional CLLC topology.
Advantageous effects
The primary circuit is opened in a staggered way when the charge-discharge circuit is in discharge, so that the output voltage of the transformer module is easy to rise to the required voltage DV+; when in the charging mode, the primary/secondary of the transformer module can be better reduced in voltage and rectified through the synchronous switch. And the bias protection can be better carried out through frequency modulation, phase modulation and peak current sampling.
Drawings
The accompanying drawings are included to provide an understanding of the technical aspects of the present disclosure, and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present disclosure and together with the embodiments of the disclosure, not to limit the technical aspects of the present disclosure. The shapes and sizes of the various components in the drawings are not to scale, and are intended to illustrate the present application only.
FIG. 1 is a schematic diagram of a discharge circuit based on a bi-directional CLLC topology according to an embodiment of the present application;
Fig. 2 is a schematic topology diagram of a charge-discharge circuit based on a bidirectional CLLC topology according to an embodiment of the present application.
Detailed Description
The above-described aspects are further described below in conjunction with specific embodiments. It should be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The implementation conditions employed in the examples may be further adjusted as in the case of the specific manufacturer, and the implementation conditions not specified are typically those in routine experiments.
The application discloses a charge-discharge circuit based on a bidirectional CLLC topology, which comprises:
the energy storage module, the first conversion circuit, the transformer module and the second conversion circuit,
The energy storage module is provided with a first end (such as a positive end) and a second end (such as a negative end), which are respectively and electrically connected to the first conversion circuit, the first conversion circuit is a full-bridge conversion circuit, the transformer module is provided with a primary circuit and a secondary circuit, the primary circuit is electrically connected to the first conversion circuit, and the secondary circuit is electrically connected to the second conversion circuit. Preferably, a capacitor is arranged on the paths of the secondary circuit and the second conversion circuit, and the capacitor plays a role in high-frequency isolation rectification. When the charge-discharge circuit is in discharge, the primary circuit is opened in a staggered way, so that the output voltage of the transformer module is easy to rise to the required voltage DV+; when in the charging mode, the primary/secondary of the transformer module can be better reduced in voltage and rectified through the synchronous switch. The first conversion circuit and the second conversion circuit respectively comprise conversion circuits consisting of MOS switches. The second conversion circuit is electrically connected to the dc module (e.g., the photovoltaic module, and the second conversion circuit is electrically connected to a bus of the photovoltaic module). The voltage of the energy storage module is between 40V and 80V (preferably, the voltage of the energy storage module is 48V), and through the topological design, the conversion efficiency of the charge-discharge circuit is improved.
The charge-discharge circuit (hereinafter referred to as charge-discharge circuit) and the energy storage inverter based on the bidirectional CLLC topology according to the present application will be described with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a topology functional module of a charge-discharge circuit based on a bidirectional CLLC topology according to the present application.
Fig. 2 is a schematic topology diagram of the charge-discharge circuit shown in fig. 1.
The charge-discharge circuit includes: the device comprises an energy storage module, a first conversion circuit, a transformer module and a second conversion circuit.
The energy storage module comprises a rechargeable battery, and the capacity of the energy storage module can be determined according to application occasions, such as 1KWh, 2KWh, 3KWh, 4KWh, 5KWh, 30KWh and the like, and the capacity is determined according to application occasions. The implementation can be one module or a plurality of modules can be combined according to a certain rule. The energy storage module is provided with a positive electrode end and a negative electrode end, and the positive electrode end and the negative electrode end are respectively and electrically connected to the first conversion circuit. In other embodiments, the energy storage module comprises a supercapacitor. The voltage of the energy storage module in this embodiment is 48V, and in other embodiments the voltage of the energy storage module is 40V, 60V, 72V or 80V, depending on the application.
The first conversion circuit includes 4 MOS switches (e.g. first/second/third/fourth MOS switches),
The trigger terminals (gate terminals) of the first/second/third/fourth MOS switches are electrically connected to a control module (not shown), respectively, and trigger the first/second/third/fourth MOS switches based on the control module,
The first pole (drain terminal) of the first MOS switch Q121 is electrically connected to the first pole (drain terminal) of the third MOS switch Q129 and the positive terminal of the energy storage module,
The second pole (source terminal) of the first MOS switch Q121 is electrically connected to the first pole (drain terminal) of the second MOS switch Q122,
The second pole (source terminal) of the third MOS switch Q129 is electrically connected to the first pole (drain terminal) of the fourth MOS switch Q130,
The second pole (source terminal) of the fourth MOS switch Q130 is electrically connected to the second pole (source terminal) of the second MOS switch Q122 and the negative terminal of the energy storage module,
Connection point a between source terminal of first MOS switch Q121 and drain terminal of second MOS switch Q122
The connection point b between the source terminal of the third MOS switch Q129 and the drain terminal of the fourth MOS switch Q130 is electrically connected to the transformer module,
The second switching circuit has 4 MOS switches (e.g. fifth/sixth/seventh/eighth MOS switches),
The triggering terminals (gate terminals) of the fifth/sixth/seventh/eighth MOS switches are electrically connected to a control module (not shown), respectively, and trigger the fifth/sixth/seventh/eighth MOS switches based on the control module,
The first pole (drain terminal) of the fifth MOS switch Q131 is electrically connected to the first pole (drain terminal) of the seventh MOS switch Q133 and the positive pole DV+ of the DC module,
The second pole (source terminal) of the fifth MOS switch Q131 is electrically connected to the first pole (drain terminal) of the sixth MOS switch Q132,
The second pole (source terminal) of the seventh MOS switch Q133 is electrically connected to the first pole (drain terminal) of the eighth MOS switch Q134,
The second pole (source terminal) of the sixth MOS switch Q132 is electrically connected to the second pole (source terminal) of the eighth MOS switch Q134 and the negative pole DV-,
Connection point c between source terminal of fifth MOS switch Q131 and drain terminal of sixth MOS switch Q132
The connection point d between the source end of the seventh MOS switch Q133 and the drain end of the eighth MOS switch Q134 is electrically connected to the transformer module, and a capacitor C329 is disposed on a path of the connection point d connected to the secondary circuit, and the capacitor plays a role of high-frequency isolation rectification. In other embodiments, the capacitor C329 may have 2 or more capacitors (e.g., 2 capacitors (first/second capacitors) electrically connected in parallel or 2 capacitors electrically connected in series) equivalent.
The transformer module comprises at least 2 transformers, primary coils of the 2 transformers are electrically connected in parallel, the primary coils are electrically connected with a primary circuit, secondary coils of the 2 transformers are electrically connected in series, and the secondary coils are electrically connected with a secondary circuit. In this embodiment, 3 transformers (T1/T2/T3) are used, and primary windings T11/T21/T31 of the 3 transformers are electrically connected in parallel (and provided with a primary circuit), and secondary windings are electrically connected in series T12/T22/T32) (and provided with a secondary circuit). When the charge-discharge circuit is in a discharge state, primary circuits of the transformer modules in the circuit are opened in a staggered manner, so that the input voltage of the transformer modules is +/-UBA, the voltage peak value is doubled, the secondary output voltage of the transformer modules can be more easily increased to the required voltage DV+ through high-frequency isolation capacitor rectification, and when the charge-discharge circuit is in a charge state, the primary/secondary stages can be better reduced in voltage and rectified through the synchronous switch to charge UBA. The charge-discharge circuit realizes zero-voltage on MOS and zero-current off MOS. The transformer module adopts an integrated transformer module. The charging and discharging circuit can better perform bias protection through frequency modulation, phase modulation and peak current sampling during operation. In this embodiment, after the secondary windings of the 3 transformers are electrically connected in series, one end is electrically provided with a first processing module U1, which is used to detect whether the primary side of the positive half cycle is over-current, otherwise, the PWM of the present cycle is turned off, and the lower cycle is turned on again; the other end is electrically provided with a second processing module U2 which is used for detecting whether the primary side of the negative half cycle is over-current or not, otherwise, the PWM of the current cycle is closed, and the lower cycle is opened again. The first processing module U1 and the second processing module U2 are current sensors.
The above embodiments are provided to illustrate the technical concept and features of the present application, and are intended to enable those skilled in the art to understand the present application and implement the same according to the present application, not to limit the scope of the present application. All equivalent changes or modifications made by the spirit of the application are intended to be covered by the scope of the application.
Claims (10)
1. A charge-discharge circuit based on a bi-directional CLLC topology, comprising:
The device comprises an energy storage module, a first conversion circuit, a transformer module and a second conversion circuit;
the energy storage module has a positive terminal and a negative terminal,
The transformer module comprises at least 2 transformers,
The primary coils of the 2 transformers are electrically connected in parallel and electrically connected with the first conversion circuit,
The secondary coils of the 2 transformers are electrically connected in series and electrically connected with the second conversion circuit,
The first conversion circuit is electrically connected with the positive electrode end and the negative electrode end of the energy storage module,
The second conversion circuit is electrically connected with the direct current module.
2. The charge-discharge circuit based on a bi-directional CLLC topology as recited in claim 1,
The first conversion circuit comprises a first MOS switch, a second MOS switch, a third MOS switch and a fourth MOS switch, the triggering ends of the first MOS switch, the second MOS switch, the third MOS switch and the fourth MOS switch are respectively and electrically connected to the control module,
The first pole of the first MOS switch is electrically connected to the first pole of the third MOS switch and the positive pole end,
The second pole of the first MOS switch is electrically connected to the first pole of the second MOS switch,
The second pole of the third MOS switch is electrically connected to the first pole of the fourth MOS switch,
The second pole of the fourth MOS switch is electrically connected to the second pole of the third MOS switch and the negative pole terminal,
A first connection point a between the second pole of the first MOS switch and the first pole of the second MOS switch and a second connection point a between the second pole of the second MOS switch
And a second connection point b between the second pole of the third MOS switch and the first pole of the fourth MOS switch is respectively and electrically connected to the first conversion circuit.
3. A charge-discharge circuit based on a bi-directional CLLC topology as defined in claim 1 or 2,
The second switching circuit comprises a fifth MOS switch, a sixth MOS switch, a seventh MOS switch and an eighth MOS switch,
The triggering ends of the fifth MOS switch, the sixth MOS switch, the seventh MOS switch and the eighth MOS switch are respectively and electrically connected to the control module,
The first pole of the fifth MOS switch is electrically connected to the first pole of the seventh MOS switch and the positive pole of the DC module,
The second pole of the fifth MOS switch is electrically connected to the first pole of the sixth MOS switch,
The second pole of the seventh MOS switch is electrically connected to the first pole of the eighth MOS switch,
The second pole of the seventh MOS switch is electrically connected to the second pole of the eighth MOS switch and the negative pole of the DC module,
Third connection point c between second pole of fifth MOS switch and first pole of sixth MOS switch and its connection point
And a fourth connection point d between the second pole of the seventh MOS switch and the first pole of the eighth MOS switch is respectively and electrically connected to the transformer module.
4. The charge-discharge circuit based on a bi-directional CLLC topology as set forth in claim 3,
And a capacitor is arranged on a path of the fourth connection point d connected to the secondary circuit, and the capacitor is used for high-frequency isolation rectification.
5. The charge-discharge circuit based on a bi-directional CLLC topology as recited in claim 4,
The capacitor comprises a first capacitor and a second capacitor, and the first capacitor and the second capacitor are electrically connected in parallel.
6. The charge-discharge circuit based on a bi-directional CLLC topology as recited in claim 1,
The transformer module is an integrated transformer module.
7. The charge-discharge circuit based on a bi-directional CLLC topology as recited in claim 1,
The energy storage module comprises a super capacitor.
8. The charge-discharge circuit based on a bi-directional CLLC topology as recited in claim 1,
The energy storage module includes at least one battery module.
9. The charge-discharge circuit based on a bi-directional CLLC topology as recited in claim 8,
The voltage of the energy storage module is between 40V and 80V.
10. An energy storage inverter configured with a bidirectional CLLC topology-based charge-discharge circuit as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322488314.8U CN220822668U (en) | 2023-09-12 | 2023-09-12 | Charging and discharging circuit and energy storage inverter based on bidirectional CLLC topology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322488314.8U CN220822668U (en) | 2023-09-12 | 2023-09-12 | Charging and discharging circuit and energy storage inverter based on bidirectional CLLC topology |
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| Publication Number | Publication Date |
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| CN220822668U true CN220822668U (en) | 2024-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322488314.8U Active CN220822668U (en) | 2023-09-12 | 2023-09-12 | Charging and discharging circuit and energy storage inverter based on bidirectional CLLC topology |
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| Country | Link |
|---|---|
| CN (1) | CN220822668U (en) |
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- 2023-09-12 CN CN202322488314.8U patent/CN220822668U/en active Active
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