CN210201543U - Charging circuit for improving reliability and photovoltaic air conditioning equipment - Google Patents
Charging circuit for improving reliability and photovoltaic air conditioning equipment Download PDFInfo
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- CN210201543U CN210201543U CN201921402037.1U CN201921402037U CN210201543U CN 210201543 U CN210201543 U CN 210201543U CN 201921402037 U CN201921402037 U CN 201921402037U CN 210201543 U CN210201543 U CN 210201543U
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 10
- 230000001737 promoting effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a charging circuit and photovoltaic air conditioning equipment for promoting reliability. Wherein, this circuit includes: the switches are connected with the alternating current filter plate and used for controlling the on-off of the charging circuit; the charging resistors are connected in series with the switches in a one-to-one correspondence mode to form a plurality of charging branches, and the charging branches are connected between the alternating current filter board and the rectifying module in parallel and used for limiting the current in the charging circuit; the rectifying module is connected between the direct current bus and the charging resistor and used for limiting the current direction of the charging circuit. Through the utility model discloses, with the both ends of charging circuit lug connection to direct current generating line, do not rely on the IGBT module, can promote the reliability.
Description
Technical Field
The utility model relates to an energy storage device technical field particularly, relates to a charging circuit and photovoltaic air conditioning equipment for promoting reliability.
Background
The scheme that current photovoltaic air conditioner's charge circuit adopted is: the normally closed relay is connected with the charging resistor in series, and the charging loop is bridged at two ends of the main loop charging relay. The charging circuit charges the direct current bus through the anti-parallel diode inside the IGBT module after the unit is electrified, after charging is completed and a detection system has no fault, the main circuit relay is closed, the charging relay is disconnected, and the charging process is completed.
The problem that a charging loop in the prior art depends on an IGBT module and is low in reliability is solved.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an in provide a charging circuit and photovoltaic air conditioning equipment for promoting the reliability to charging circuit relies on the IGBT module among the solution prior art, the problem that the reliability is low.
In order to solve the above technical problem, the utility model provides a charging circuit, wherein, this circuit includes:
the switches are connected with the alternating current filter plate and used for controlling the on-off of the charging circuit;
the charging resistors are connected in series with the switches in a one-to-one correspondence mode to form a plurality of charging branches, and the charging branches are connected between the alternating current filter board and the rectifying module in parallel and used for limiting the current in the charging circuit;
the rectifying module is connected between the direct current bus and the charging resistor and used for limiting the current direction of the charging circuit.
Further, the highest reverse voltage value of the rectifier module is larger than the maximum value of the direct current bus voltage.
Furthermore, the rectifying module comprises a first rectifying bridge, a second rectifying bridge and a third rectifying bridge, and the first rectifying bridge, the second rectifying bridge and the third rectifying bridge are connected in parallel and then connected to two ends of the direct current bus.
Further, the first rectifier bridge comprises a first rectifier element and a second rectifier element which are connected in series, and the positive poles and the negative poles of the first rectifier element and the second rectifier element are connected in sequence;
the second rectifier bridge comprises a third rectifier element and a fourth rectifier element which are connected in series, and the positive poles and the negative poles of the third rectifier element and the fourth rectifier element are sequentially connected;
the third rectifier bridge comprises a fifth rectifier element and a sixth rectifier element which are connected in series, and the positive poles and the negative poles of the fifth rectifier element and the sixth rectifier element are connected in sequence.
Furthermore, the negative electrode of the first rectifying element, the negative electrode of the third rectifying element and the negative electrode of the fifth rectifying element are combined and then connected with the positive electrode of the direct current bus;
and the anode of the second rectifying element, the anode of the fourth rectifying element and the anode of the sixth rectifying element are combined and then connected with the cathode of the direct current bus.
Further, a line between the first rectifying element and the second rectifying element, a line between the third rectifying element and the fourth rectifying element, and a line between the fifth rectifying element and the sixth rectifying element are respectively connected to each charging resistor.
Further, the switch is a relay.
The utility model also provides a photovoltaic air conditioning equipment, including above-mentioned charging circuit.
Use the technical scheme of the utility model, with the both ends of charging circuit lug connection to DC bus, with rectifier module access DC bus with between the charging resistor, make the three-phase alternating current of alternating current filter board output, pass through in proper order switch, charging resistor and rectifier module transform are the direct current that the electric current size reduces, charge to DC bus capacitance, and charging current does not pass through the IGBT module, consequently, even the inside component short circuit of IGBT module, also can not exert an influence to the charging process, and simultaneously, charging current also can not pass through main loop relay, avoids main loop relay inefficacy to produce the influence to charging circuit, has improved charging circuit's reliability to, rectifier module's setting has improved charging circuit's withstand voltage value.
Drawings
Fig. 1 is a diagram of a charging circuit structure according to an embodiment of the present invention;
fig. 2 is a circuit configuration diagram of a rectifier module according to an embodiment of the present invention;
fig. 3 is a charging circuit of a conventional photovoltaic air conditioner;
fig. 4 is a structural diagram of a charging circuit according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe the rectifying elements in the embodiments of the present invention, these rectifying elements should not be limited to these terms. These terms are only used to distinguish between the rectifier elements of different rectifier bridges. For example, the first rectifying element may also be referred to as a second rectifying element, and similarly, the second rectifying element may also be referred to as a first rectifying element, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
The following describes in detail alternative embodiments of the present invention with reference to the accompanying drawings.
Example 1
Fig. 1 is a structural diagram of a charging circuit according to an embodiment of the present invention, as shown in fig. 1, the charging circuit includes:
the switches 1 are connected with the alternating current filter plate 5 and used for controlling the on-off of the charging circuit;
the charging resistors 2 are connected in series with the switches 1 in a one-to-one correspondence manner to form a plurality of charging branches, and the charging branches are connected in parallel between the alternating current filter plate 5 and the rectifying module and used for limiting the current in the charging circuit;
specifically, firstly, the charging resistors 2 and the switches 1 are connected in series in a one-to-one correspondence manner, each group of the charging resistors 2 and the switches 1 connected in series is a charging path, then the charging branches are connected in parallel between the alternating current filter plate 5 and the rectifying module, and each charging resistor 2 is used for reducing the current of the charging branch where the charging resistor is located.
The rectifying module 3 is connected between the direct current bus 4 and the charging resistor 2 and used for limiting the current direction of the charging circuit.
In this embodiment, the switch 1 may be a normally open switch, and is in an open state without an external current or voltage, and the entire charging circuit is open, that is, the charging mode of the charging circuit is closed in a normal state, and when it is necessary to charge the dc bus capacitor 6, a control current or voltage is input to the switch 1, and the switch 1 is switched to be closed, so as to control the entire charging circuit to be turned on, and start charging.
In the utility model discloses an in other embodiments, switch 1 also can be the normally closed switch, is in the closed condition under the condition that does not have the effect of external current or voltage, and whole charging circuit switches on, and charging circuit's the mode of charging switches on under normal condition promptly, when needs stop charging, to switch 1 input control current or voltage, switch 1 converts the disconnection into, controls the disconnection of whole charging circuit, finishes charging.
Specifically, in this embodiment, the switch 1 may be a normally open relay, and before the coil is energized, the contact of the normally open relay is not turned on, the whole charging circuit is turned off, and the dc bus capacitor 6 is not charged; when the coil of the capacitor is electrified, the contact of the normally open relay is switched on, so that the whole charging circuit is switched on, and the charging circuit is controlled to charge the direct current bus capacitor 6.
In this embodiment, the charging resistor 2 is a power resistor, a resistance value of the power resistor can be selected according to a preset charging current, and the smaller the preset charging current is, the larger the resistance value of the power resistor is, so as to limit a current in the charging circuit.
Fig. 2 is a circuit structure diagram of the rectifier module 3 according to the embodiment of the present invention, as shown in fig. 2, in this embodiment, the rectifier module 3 has an effect of making the current conduct in one direction, and ensures that the current does not flow in the reverse direction in the charging process of the dc bus capacitor 6.
With the both ends of charging circuit lug connection to DC bus 4, with rectifier module 3 access DC bus 4 with between the charging resistor 2, make the three-phase alternating current of 5 outputs of alternating current filter board, pass through in proper order switch 1, charging resistor 2 and rectifier module 3 transform the direct current that the electric current size reduces, charge to DC bus electric capacity 6, charging current does not pass through the IGBT module, consequently, even the inside component short circuit of IGBT module, also can not exert an influence to the charging process, and simultaneously, charging current also can not pass through main loop relay, avoid main loop relay inefficacy to exert an influence to charging circuit, charging circuit's reliability has been improved, and, rectifier module 3's setting has improved charging circuit's withstand voltage value.
In a specific implementation process, generally, the rectifier module 3 can only conduct a current in one direction, and a current in the other direction is cut off, but when an applied reverse voltage is too high, the reverse current will suddenly increase, so that the rectifier module 3 is broken down and fails, and therefore, in this embodiment, the highest reverse voltage value of the rectifier module 3 is greater than the maximum value of the dc bus voltage, and the situation that the dc bus voltage is too high, so that the rectifier module 3 is broken down reversely, and loses the unidirectional conduction capability is avoided.
In this embodiment, the rectifier module 3 specifically includes: the first rectifier bridge, the second rectifier bridge and the third rectifier bridge are connected in parallel and then are connected to two ends of the direct current bus 4;
specifically, a positive input end of the first rectifier bridge is connected with a negative electrode of the direct current bus 4, and a positive output end of the first rectifier bridge is connected with a positive electrode of the direct current bus 4;
the positive input end of the second rectifier bridge is connected with the negative electrode of the direct current bus 4, and the positive output end of the second rectifier bridge is connected with the positive electrode of the direct current bus 4;
and the positive input end of the third rectifier bridge is connected with the negative electrode of the direct current bus 4, and the positive output end of the third rectifier bridge is connected with the positive electrode of the direct current bus 4.
In this embodiment, the first rectifier bridge includes a first rectifier element 31 and a second rectifier element connected in series, and the positive pole and the negative pole of the first rectifier element 31 and the positive pole of the second rectifier element 32 are connected in sequence;
the second rectifier bridge comprises a third rectifier element 33 and a fourth rectifier element 34 which are connected in series, and the positive poles and the negative poles of the third rectifier element 33 and the fourth rectifier element 34 are connected in sequence;
the third rectifier bridge comprises a fifth rectifier element 35 and a sixth rectifier element 36 which are connected in series, and the positive poles and the negative poles of the fifth rectifier element 35 and the sixth rectifier element 36 are connected in sequence;
specifically, in the present embodiment, the positive electrode of the first rectifying element 31 is connected to the negative electrode of the second rectifying element 32; the positive electrode of the third rectifying element 33 is connected to the negative electrode of the fourth rectifying element 34; the positive electrode of the fifth rectifying element 35 is connected to the negative electrode of the sixth rectifying element.
In this embodiment, the line between the first rectifying element 31 and the second rectifying element 32, the line between the third rectifying element 33 and the fourth rectifying element 34, and the line between the fifth rectifying element 35 and the sixth rectifying element 36 are respectively connected to each charging resistor 2, and further to the ac filter plate 5.
Specifically, a line led out between the positive electrode of the first rectifying element 31 and the negative electrode of the second rectifying element 32 is connected with one of the charging resistors 2, and further connected with the alternating current filter plate 5;
a line led out between the positive electrode of the third rectifying element 33 and the negative electrode of the fourth rectifying element 34 is connected with another charging resistor 2, and further connected with an alternating current filter plate 5;
the positive electrode of the fifth rectifying element 35 and the negative electrode of the sixth rectifying element are connected to the other charging resistor 2 than the charging resistors 2, and further connected to the ac filter plate 5.
A first rectifier bridge is formed by connecting a first rectifier element 31 and a second rectifier element 32 in series in sequence; the third rectifier element 33 and the fourth rectifier element 34 are connected in series in sequence to form a second rectifier bridge; the fifth rectifying element 35 and the sixth rectifying element 36 are connected in series in sequence to form a third rectifying bridge; the rectifier comprises a first rectifier bridge, a second rectifier bridge and a third rectifier bridge, wherein the first rectifier bridge, the second rectifier bridge and the third rectifier bridge are connected in parallel to form a rectifier module 3 and are connected to two ends of the direct current bus.
Specifically, the first rectifying element, the second rectifying element, the third rectifying element, the fourth rectifying element, the fifth rectifying element and the sixth rectifying element are rectifying elements.
The current can only flow from the positive pole to the negative pole through the unidirectional conduction function of the rectifier element, and then the three-phase alternating current output by the alternating current filter plate 5 is converted into direct current flowing out from the negative pole of the direct current bus and flowing in from the positive pole of the direct current bus through rectification, and further the direct current bus capacitor 6 connected between the positive pole and the negative pole of the direct current bus is charged.
Example 2
This embodiment provides a photovoltaic air conditioning equipment, including the charging circuit of above-mentioned embodiment, through the both ends with charging circuit lug connection to DC bus to the DC bus electric capacity in the photovoltaic air conditioning equipment charge, promote the reliability in the photovoltaic air conditioning equipment charging process.
Example 3
Another alternative embodiment of the present invention is further described below by comparing it with the existing charging circuit.
Fig. 3 is a charging circuit of a conventional photovoltaic air conditioner, as shown in fig. 3, a normally closed relay is connected in series with a charging current limiting resistor, and a charging circuit is bridged across two ends of a main circuit charging relay. After the unit is electrified, the charging loop charges the direct-current bus through the anti-parallel rectifier element in the IGBT module, after charging is completed and the detection system has no fault, the main loop relay is closed, the charging relay is disconnected, and the charging process is completed.
Fig. 4 is a structural diagram of a charging circuit according to another embodiment of the present invention, as shown in fig. 4, the charging circuit of this embodiment directly takes three-phase ac power after the ac filter plate 50 (i.e. the ac filter plate 5 in the above embodiment), and the three-phase ac power passes through the charging relay 10 (i.e. the switch 1 in the above embodiment) and the charging current limiting resistor 20 (i.e. the charging resistor 2 in the above embodiment), and then is converted into dc power with smaller current by the three-phase rectifier bridge 30 (i.e. the rectifier module 3 in the above embodiment) to directly charge the dc bus capacitor 60 (i.e. the dc bus capacitor 6 in the above embodiment), and when it is detected that the voltage has reached the requirement, the charging relay is; this process is repeated in the main loop relay sticking detection logic.
The main components comprise a charging relay 10, a charging current-limiting resistor 20 and a three-phase rectifier bridge 30.
In this embodiment, the charging relay 10 is a normally closed relay, and is kept in an off state after charging is completed; the charging current limiting resistor 20 should select a power resistor matching with a preset current in the charging circuit, and during layout, it is considered that a sufficient heat dissipation space is left for it or a corresponding heat dissipation measure is provided, and at the same time, it must be far away from a heat-sensitive device, so as to ensure that the charging point current limiting resistor will not be burnt out due to overheating and will not damage surrounding devices or affect control logic under the condition that the charging relay 10 fails and can not be disconnected. The three-phase rectifier bridge 30 needs to have enough overcurrent capacity and reverse withstand voltage, so that the condition that reverse breakdown cannot occur even if the voltage of a direct-current bus is too high is ensured, and meanwhile, the better overcurrent capacity is far greater than the current flowing in a charging loop when charging is carried out, so that the heat dissipation problem of the three-phase rectifier bridge 30 is solved.
Compared with the existing charging loop, the rectifying device is added in the charging loop, the charging loop is directly connected to the direct current bus 40 (namely the direct current bus 4 in the embodiment), and the link assisted by the middle IGBT module is bypassed, so that the influence of the IGBT module on the charging loop can be effectively reduced, and the reliability of the charging loop is improved; and the alternating current three-phase power and the direct current bus are connected completely through the rectifier bridge and are not only connected to two ends of the main circuit relay, so that the influence of the failure of the main circuit relay on the charging circuit is effectively avoided, and meanwhile, the three-phase charging is changed from two-phase charging, and the three-phase balance is facilitated.
The above-described embodiments of the apparatus are merely illustrative, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. A charging circuit, comprising:
the switches are connected with the alternating current filter plate and used for controlling the on-off of the charging circuit;
the charging resistors are connected in series with the switches in a one-to-one correspondence mode to form a plurality of charging branches, and the charging branches are connected between the alternating current filter board and the rectifying module in parallel and used for limiting the current in the charging circuit;
the rectifying module is connected between the direct current bus and the charging resistor and used for limiting the current direction in the charging circuit.
2. The circuit of claim 1, wherein a highest reverse voltage value of the rectifier module is greater than a maximum value of the dc bus voltage.
3. The circuit of claim 1, wherein the rectifier module comprises a first rectifier bridge, a second rectifier bridge and a third rectifier bridge, and the first rectifier bridge, the second rectifier bridge and the third rectifier bridge are connected in parallel and then connected to two ends of the direct current bus.
4. The circuit of claim 3, wherein the first rectifier bridge comprises a first rectifier element and a second rectifier element connected in series, and the positive pole and the negative pole of the first rectifier element and the positive pole of the second rectifier element are connected in sequence;
the second rectifier bridge comprises a third rectifier element and a fourth rectifier element which are connected in series, and the positive poles and the negative poles of the third rectifier element and the fourth rectifier element are sequentially connected;
the third rectifier bridge comprises a fifth rectifier element and a sixth rectifier element which are connected in series, and the positive poles and the negative poles of the fifth rectifier element and the sixth rectifier element are connected in sequence.
5. The circuit of claim 4, wherein the negative electrode of the first rectifying element, the negative electrode of the third rectifying element and the negative electrode of the fifth rectifying element are combined and then connected with the positive electrode of the direct current bus;
and the anode of the second rectifying element, the anode of the fourth rectifying element and the anode of the sixth rectifying element are combined and then connected with the cathode of the direct current bus.
6. The circuit according to claim 4, wherein a line between the first rectifying element and the second rectifying element, a line between the third rectifying element and the fourth rectifying element, and a line between the fifth rectifying element and the sixth rectifying element are respectively connected to each charging resistor.
7. The circuit of claim 1, wherein the switch is a relay.
8. Photovoltaic air conditioning equipment, characterized in that it comprises a charging circuit according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921402037.1U CN210201543U (en) | 2019-08-27 | 2019-08-27 | Charging circuit for improving reliability and photovoltaic air conditioning equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921402037.1U CN210201543U (en) | 2019-08-27 | 2019-08-27 | Charging circuit for improving reliability and photovoltaic air conditioning equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110401256A (en) * | 2019-08-27 | 2019-11-01 | 珠海格力电器股份有限公司 | Charging circuit for improving reliability, control method and photovoltaic air conditioning equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110401256A (en) * | 2019-08-27 | 2019-11-01 | 珠海格力电器股份有限公司 | Charging circuit for improving reliability, control method and photovoltaic air conditioning equipment |
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