CN210430996U - Bidirectional charging and discharging circuit - Google Patents
Bidirectional charging and discharging circuit Download PDFInfo
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- CN210430996U CN210430996U CN201921582384.7U CN201921582384U CN210430996U CN 210430996 U CN210430996 U CN 210430996U CN 201921582384 U CN201921582384 U CN 201921582384U CN 210430996 U CN210430996 U CN 210430996U
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Abstract
The utility model relates to a two-way charge-discharge circuit, through setting up two-way DC/DC unit, the direct current link, two-way DC/AC unit and switch unit, two-way DC/DC unit, the direct current link, two-way DC/AC unit and switch unit connect gradually, two-way DC/DC unit is used for being connected with external battery, two-way DC/AC unit is used for connecting with the alternating current electric wire netting through the switch unit, two-way DC/DC unit still is used for when external battery needs to charge, adjust to the boost mode so that direct current link voltage boosts to preset target voltage, two-way DC/AC unit still is used for when direct current link voltage boosts to preset target voltage, adjust to the rectification mode, the switch unit is used for closing when two-way DC/AC adjusts to the rectification mode, two-way DC/DC unit still is used for after the switch unit closes, the voltage boosting mode is adjusted to the voltage reducing mode, so that a charging circuit of the external battery is simplified.
Description
Technical Field
The utility model relates to a circuit control field especially relates to a two-way charge-discharge circuit.
Background
With the gradual popularization of power batteries, the requirements of battery bidirectional charging and discharging equipment matched with the power batteries are increasing day by day. The bidirectional charging and discharging equipment is connected with a battery at the direct current side, an alternating current power grid is connected at the alternating current side, and when the battery needs to be charged and is connected with alternating current, the bidirectional charging and discharging equipment needs to be provided with an alternating current bidirectional charging and discharging circuit to prevent the direct current link from being damaged by the impact of the instantaneous current during connection.
The traditional alternating current bidirectional charging and discharging circuit usually adopts a three-phase pre-charging resistance circuit or a rectifier bridge bidirectional charging and discharging circuit, wherein the three-phase pre-charging resistance circuit cannot charge a direct current link to a preset target voltage during charging due to the existence of an alternating current filter capacitor, and cannot be applied to bidirectional charging and discharging; the rectifier bridge is connected to the direct current link in the rectifier bridge bidirectional charging and discharging circuit, so that the problem that the direct current link cannot be charged to a preset target voltage is solved, the circuit is more in devices, and the whole circuit is too complex.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a two-way charge-discharge circuit.
A bi-directional charging and discharging circuit, comprising: the bidirectional DC/DC unit, the direct current link, the bidirectional DC/AC unit and the switch unit are sequentially connected;
the bidirectional DC/DC unit is used for being connected with an external battery and is connected with an alternating current power grid through the switch unit;
the bidirectional DC/DC unit is used for adjusting the voltage to a boosting mode to boost the voltage of the direct-current link to a preset target voltage when the external battery needs to be charged, and the preset target voltage is greater than the voltage of the alternating-current power grid;
the bidirectional DC/AC unit is used for adjusting the direct current link voltage to be in a rectification mode when the direct current link voltage is boosted to a preset target voltage;
the switching unit is used for being closed when the bidirectional DC/AC is adjusted to be in a rectification mode;
the bidirectional DC/DC unit is also used for adjusting the voltage boosting mode to the voltage reducing mode after the switch unit is closed so that the alternating current power grid can charge the external battery.
In one embodiment, the bidirectional DC/DC unit includes a DC side filter capacitor and at least one set of bidirectional DC/DC converters, the DC side filter capacitor being connected to each set of bidirectional DC/DC converters.
In one embodiment, each set of bidirectional DC/DC converters includes a DC inductor and two switching tubes, one end of the DC inductor is connected to the DC-side filter capacitor, and the switching tubes are respectively connected to the other ends of the DC link and the DC inductor.
In one embodiment, the switching tube adopts a MOS tube or an IGBT tube.
In one embodiment, the bidirectional DC/AC unit comprises a three-phase fully-controlled bridge, a three-phase current-intersecting inductor and an alternating-current side capacitor which are connected in sequence.
In one embodiment, the ac side capacitors are connected in a delta or star configuration.
In one embodiment, the preset target voltage is at least 1.3 times the ac grid voltage.
In one embodiment, the bidirectional DC/AC unit is configured to be in a turn-off state when the DC link voltage is not boosted to a preset target voltage.
In one embodiment, the switching unit employs an ac contactor.
In one embodiment, the dc link is provided with a bus capacitance.
The bidirectional charging and discharging circuit is characterized in that the bidirectional DC/DC unit, the direct current link, the bidirectional DC/AC unit and the switch unit are arranged and sequentially connected, the bidirectional DC/DC unit is used for being connected with an external battery, the bidirectional DC/AC unit is used for being connected with an alternating current power grid through the switch unit, the bidirectional DC/DC unit is further used for being adjusted to be in a boosting mode to enable the voltage of the direct current link to be boosted to a preset target voltage when the external battery needs to be charged, the preset target voltage is larger than the voltage of the alternating current power grid, the bidirectional DC/AC unit is further used for being adjusted to be in a rectifying mode when the voltage of the direct current link is boosted to the preset target voltage, the switch unit is used for being closed when the bidirectional DC/AC unit is adjusted to be in the rectifying mode, and the bidirectional DC/AC unit is further used for being adjusted to be in the rectifying mode after the, the charging circuit is adjusted to be a voltage reduction mode by a voltage boosting mode so that an alternating current power grid can charge an external battery, the bidirectional charging and discharging circuit can be directly connected with the external alternating current power grid after the switch unit is closed, and the direct current link voltage is increased to a preset target voltage, so that the influence of the traditional impact current can be avoided, the traditional pre-charging resistor is omitted, the charging circuit of the external battery is more simplified, and the charging cost of the whole battery can be reduced under the condition that the charging safety of the whole battery is ensured.
Drawings
In order to illustrate the technical solution of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 is a block diagram of a circuit structure of a bidirectional charging and discharging circuit provided in an embodiment;
fig. 2 is a circuit diagram of a bidirectional charging/discharging circuit according to an embodiment.
Detailed Description
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Various embodiments of the present disclosure will be described more fully hereinafter. The present disclosure is capable of various embodiments and of modifications and variations therein. However, it should be understood that: there is no intention to limit the various embodiments of the disclosure to the specific embodiments disclosed herein, but rather, the disclosure is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the disclosure.
Hereinafter, the term "includes" or "may include" used in various embodiments of the present disclosure indicates the presence of the disclosed functions, operations, or elements, and does not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of the present disclosure, the terms "comprising," "having," and their derivatives, are intended to be only representative of the particular features, integers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to one or more other features, integers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the disclosure, at least one of the expressions a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present disclosure may modify various constituent elements in the various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present disclosure.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The term "user" used in various embodiments of the present disclosure may indicate a person using an electronic device or a device using an electronic device (e.g., an artificial intelligence electronic device).
The terminology used in the various embodiments of the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the present disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present disclosure belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined in various embodiments of the present disclosure.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Fig. 1 is a block diagram of a circuit structure of a bidirectional charging/discharging circuit 100 according to an embodiment, where the bidirectional charging/discharging circuit 100 includes: the bidirectional DC/DC unit 110, the direct current link 120, the bidirectional DC/AC unit 130 and the switch unit 140 are connected in sequence.
The bidirectional DC/DC unit 110 is configured to be connected to an external battery, and the bidirectional DC/DC unit 110 is configured to be connected to an ac power grid through the switching unit 140.
The bidirectional DC/DC unit 110 is configured to adjust to a boost mode to boost the voltage of the DC link 120 to a preset target voltage when the external battery needs to be charged, where the preset target voltage is greater than the ac grid voltage.
When the external battery is connected to the bidirectional DC/DC unit 110 and the bidirectional DC/DC unit 110 is adjusted to the boost mode, the external battery is discharged first, and the voltage of the DC link 120 is boosted to reach a preset target voltage value.
The bidirectional DC/DC unit 110 is adjusted to a boost mode by receiving an external control pulse.
The preset target voltage value is usually greater than the grid voltage value of the external power grid.
Further, the bidirectional DC/AC unit 130 is configured to adjust to a rectification mode when the voltage of the DC link 120 is boosted to a preset target voltage.
When the voltage of the DC link 120 is boosted to a predetermined target voltage, the bidirectional DC/AC unit 130 receives an external control pulse to adjust the voltage to a rectification mode.
Further, the switching unit 140 is configured to be closed when the bidirectional DC/AC is adjusted to the rectifying mode.
Further, the bidirectional DC/DC unit 110 is further configured to adjust the step-up mode to the step-down mode after the switch unit 140 is closed, so that the ac power grid can charge the external battery.
Since the voltage of the DC link 120 has already reached the preset target voltage value, and the preset target voltage value is greater than the external power grid voltage value, no inrush current is generated after the switch unit 140 is turned on and the bidirectional DC/DC unit 110 is adjusted to the buck mode, thereby avoiding the influence of the conventional inrush current.
The bidirectional charging and discharging circuit 100 can be directly connected with an external alternating current power grid after the switch unit 140 is closed, and because the voltage of the direct current link 120 is increased to a preset target voltage, the influence of the traditional impact current is avoided, the traditional pre-charging resistor is omitted, so that the charging circuit of an external battery is more simplified, and the charging cost of the whole battery is reduced under the condition of ensuring the charging safety of the whole battery.
In one embodiment, referring to fig. 2, the bi-directional DC/DC unit 110 includes a DC side filter capacitor C1 and at least one set of bi-directional DC/DC converters 112, with a DC side filter capacitor C1 connected to each set of bi-directional DC/DC converters 112.
In one embodiment, referring to fig. 2, each set of bidirectional DC/DC converters 112 includes a DC inductor L1 and two switching tubes, one end of the DC inductor L1 is connected to the DC side filter capacitor C1, and the switching tubes are further connected to the other ends of the DC link 120 and the DC inductor L1, respectively.
In one embodiment, referring to fig. 2, the dc link 120 is provided with a bus capacitance C2.
In one embodiment, referring to fig. 2, the bidirectional DC/AC unit 130 includes a three-phase fully controlled bridge 132, a three-phase current-crossing inductor (L2a, L2b, and L2C), and an AC side capacitor C3 connected in series.
In one embodiment, the switching tube adopts a MOS tube or an IGBT tube.
In one embodiment, referring to fig. 2, the ac side capacitor C3 is connected in a delta configuration.
In one embodiment, the preset target voltage is at least 1.3 times the ac grid voltage.
Generally, the preset target voltage is set to be 1.3 times or more of the ac grid voltage, so that the current surge effect caused when the switch unit 140 is closed can be effectively eliminated.
In one embodiment, the bidirectional DC/AC unit 130 is configured to be in a turn-off state when the voltage of the DC link 120 is not boosted to a preset target voltage.
In one embodiment, the switching unit 140 employs an ac contactor.
Fig. 2 is a circuit structure diagram of the bidirectional charging and discharging circuit 100 according to an embodiment, in which the bidirectional DC/DC unit 110 includes a DC-side filter capacitor C1 and two sets of bidirectional DC/ DC converters 112a and 112b, the DC link 120 is provided with a bus capacitor C2, the bidirectional DC/AC unit 130 includes a three-phase fully controlled bridge 132, a three-phase AC inductor L2, and an AC-side capacitor C3, which are connected in sequence, the AC-side capacitor C3 is connected in a delta, and the switching tubes are all silicon carbide MOS tubes.
Taking the first group of bidirectional DC/DC converters 112a as an example, the bidirectional DC/DC converter 112a includes a DC inductor L1a and two switching tubes (Q11a and Q12a), one end of the DC inductor L1a is connected to the DC-side filter capacitor C1, and the switching tubes (Q11a and Q12a) are further connected to the other ends of the DC link 120 and the DC inductor L1a, respectively.
The switching tube is a MOS tube, the drain of Q11a is connected to the dc link 120, the source of Q11a is connected to one end of a dc inductor L1, the source of Q12a is connected to the dc link 120, and the drain of Q12a is connected to one end of a dc inductor L1.
The connection arrangement of the other set of bidirectional DC/DC converters 112b is the same as that of the first set of bidirectional DC/DC converters 112a, wherein the two sets of bidirectional DC/DC converter parameters are generally set the same in order to maintain the balance of the circuit configuration.
The bidirectional DC/AC unit 130 includes a three-phase fully controlled bridge 132, a three-phase AC inductor L2(L2a, L2b, and L2C), and an AC-side capacitor C3, which are connected in sequence, and the AC-side capacitor C3 is connected in a delta.
The three-phase fully-controlled bridge 132 can be adjusted to an inverter mode, a rectifier mode, or a cut-off state under the action of the external control pulse.
The three-phase fully-controlled bridge 132 is structured as shown in fig. 2, each phase is provided with a corresponding switch tube, the three-phase fully-controlled bridge 132 includes three groups of switch tubes Q21a and Q21b, Q31a and Q31b, and Q41a and Q41b, wherein each group of switch tubes may adopt MOS tubes, and in addition, an IGBT tube may also be adopted.
When the bidirectional DC/DC unit 110 is adjusted to the boost mode, Q11a and Q12a operate to boost the voltage of the DC link 120 to reach a preset target voltage value; when the bi-directional DC/DC unit 110 is adjusted to the buck mode, Q11b and Q12b operate for buck.
Further, the bidirectional DC/AC unit 130 is configured to adjust to a rectification mode when the voltage of the DC link 120 is boosted to a preset target voltage.
Wherein Q21b, Q31b, and Q41b operate when the bi-directional DC/AC unit 130 is in the rectifying mode.
Wherein, L2(L2a, L2b and L2c) can adopt PFC (Power Factor Correction) inductance, and it has two effects, and Power Factor when the Correction of an effect Power Factor can improve above-mentioned two-way DC/AC unit rectification, reduces the pollution to the electric wire netting, and the second effect is for stepping up, and cooperation switching tube Q21b, Q31b and Q41b can make the rectifier bridge become controllable rectification of stepping up from uncontrollable rectification.
Further, the switching unit 140 is configured to be closed when the bidirectional DC/AC is adjusted to the rectifying mode.
Further, when the switch unit 140 is closed, Q11b and Q12b are operated, and the bidirectional DC/DC unit is adjusted from the step-up mode to the step-down mode, so that the external battery can be charged by the ac power grid.
Taking a set of actual circuit parameters as an example, the voltage of the power battery is 460V, the capacity is 124kW · h, the capacitance C1 is 450uF, the sizes of L1a and L1b are both 60uH, the capacitance C2 is 1800uF, the sizes of L2a, L2b and L2C are all 75uH, and the preset target voltage value is set to be 1.4 times of the external grid voltage, so that the energy required by charging the dc link 120 is equal to
Relative to the energy of a power battery, 124 kW.h is 4.464 multiplied by 108J can be ignored, therefore, the electric quantity can not be completely discharged in the use process of the power battery, so that the charging circuit of the external battery is more simplified, and the charging cost of the whole battery is reduced under the condition of ensuring the charging safety of the whole battery.
Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The sequence numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the implementation scenario. The above disclosure is only a few specific implementation scenarios of the present invention, however, the present invention is not limited thereto, and any changes that can be considered by those skilled in the art shall fall within the protection scope of the present invention.
In addition, each functional module or unit in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention.
Claims (10)
1. A bidirectional charging and discharging circuit, comprising: the bidirectional DC/DC unit, the direct current link, the bidirectional DC/AC unit and the switch unit are sequentially connected;
the bidirectional DC/DC unit is used for being connected with an external battery, and the bidirectional DC/AC unit is used for being connected with an alternating current power grid through the switch unit;
the bidirectional DC/DC unit is also used for adjusting the external battery to be in a boosting mode to boost the voltage of the direct-current link to a preset target voltage when the external battery needs to be charged, and the preset target voltage is greater than the voltage of the alternating-current power grid;
the bidirectional DC/AC unit is also used for adjusting the direct current link voltage to be in a rectification mode when the direct current link voltage is boosted to a preset target voltage;
the switching unit is used for being closed when the bidirectional DC/AC is adjusted to be in a rectification mode;
and the bidirectional DC/DC unit is also used for adjusting the voltage boosting mode into the voltage reduction mode after the switch unit is closed so that the external battery can be charged by the alternating current grid.
2. The bi-directional charging and discharging circuit of claim 1, wherein the bi-directional DC/DC unit comprises a DC side filter capacitor and at least one set of bi-directional DC/DC converters, the DC side filter capacitor being connected to each set of bi-directional DC/DC converters.
3. The bidirectional charging and discharging circuit of claim 2, wherein each set of bidirectional DC/DC converter includes a DC inductor and two switching tubes, one end of the DC inductor is connected to the DC side filter capacitor, and the switching tubes are further connected to the DC link and the other end of the DC inductor, respectively.
4. The bidirectional charging and discharging circuit of claim 3, wherein the switching tube is a MOS tube or an IGBT tube.
5. The bidirectional charging and discharging circuit of claim 1, wherein the bidirectional DC/AC unit comprises a three-phase fully controlled bridge, a three-phase current-crossing inductor, and an AC side capacitor connected in sequence.
6. The bidirectional charging and discharging circuit of claim 5, wherein the AC-side capacitors are connected in a delta or star configuration.
7. A bi-directional charging and discharging circuit according to claim 1, wherein said preset target voltage is at least 1.3 times said ac mains voltage.
8. The bi-directional charging and discharging circuit of claim 1, wherein the bi-directional DC/AC unit is configured to be in a turn-off state when the DC link voltage is not boosted to a preset target voltage.
9. The bi-directional charging and discharging circuit according to claim 1, wherein the switching unit employs an ac contactor.
10. The bi-directional charge and discharge circuit of claim 1, wherein the dc link is provided with a bus capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921582384.7U CN210430996U (en) | 2019-09-20 | 2019-09-20 | Bidirectional charging and discharging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921582384.7U CN210430996U (en) | 2019-09-20 | 2019-09-20 | Bidirectional charging and discharging circuit |
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| CN210430996U true CN210430996U (en) | 2020-04-28 |
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| CN201921582384.7U Active CN210430996U (en) | 2019-09-20 | 2019-09-20 | Bidirectional charging and discharging circuit |
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