CN213279272U - Multi-power-supply-loop power supply circuit and electrical system - Google Patents
Multi-power-supply-loop power supply circuit and electrical system Download PDFInfo
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- CN213279272U CN213279272U CN202022568130.9U CN202022568130U CN213279272U CN 213279272 U CN213279272 U CN 213279272U CN 202022568130 U CN202022568130 U CN 202022568130U CN 213279272 U CN213279272 U CN 213279272U
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Abstract
The utility model discloses a many power supply circuit and electrical system, many power supply circuit includes: the power supply comprises an alternating current load circuit, a direct current load circuit, an alternating current power supply for supplying power to the alternating current load circuit, a direct current power supply for supplying power to the direct current load circuit and a switching circuit for connecting the alternating current load circuit and the direct current load circuit; when the alternating current power supply fails, the switching circuit converts direct current output by the direct current power supply into alternating current and supplies power to the alternating current load circuit; and/or when the direct current load circuit is in fault, the switching circuit converts the alternating current output by the alternating current power supply into direct current and supplies power to the direct current load circuit. Compared with the prior art, the utility model discloses when reducing stand-by power supply quantity, can strengthen the stability of power.
Description
Technical Field
The utility model relates to an electrical system, especially a many power supply circuit and electrical system.
Background
Referring to fig. 1, in the design of an electrical system, if a power supply is supplied by a single loop, when the loop power supply fails or is repaired, the entire system will be disabled and cannot be normally supplied. Therefore, a plurality of loop incoming lines need to be introduced for power supply, so that the reliability and stability of the power supply are improved. In addition, there are multiple power supplies in the electrical system, each power supply supplies power for a corresponding power type, and if the same type of power supply is added to provide reliability and stability, multiple backup power supplies are required to be connected, which results in high investment and cost.
If the power is supplied by directly adopting a mutual switching mode and technical control such as voltage transformation and the like among different power supplies, the stability and the reliability of the power supply can be improved, and the installation space, the maintenance cost and the occupied area required by equipment and equipment can be reduced.
The patent with publication number CN104410150A is a novel continuous power supply type server power supply design method for realizing AC and DC switching, which is characterized in that one power interface is connected with AC mains supply, and the other interface is connected with DC power to form a power supply line backup; a mini switching module is added behind the two power interfaces to realize AC \ DC switching; when the power supply works normally, the alternating current commercial power is used as a main circuit to supply power, and the direct current is used as a standby circuit to supply power; once the alternating current commercial power is cut off, the switching module switches the power supply interface from AC to DC within 16ms, and the power supply is continued by direct current. This patent fails to address the problem of multiple loops and multiple devices of different power specifications.
Therefore, it is an urgent technical problem in the art to design a multi-power-supply-loop power supply circuit and an electrical system, which can be applied to multiple loops and multiple devices with different power supply specifications while improving the stability and reliability of multi-power-supply power supply.
SUMMERY OF THE UTILITY MODEL
To among the prior art, the problem that can't be applicable to the equipment of a plurality of return circuits and a plurality of different power specifications, the utility model provides a many power return circuits supply circuit and electrical system.
The technical scheme of the utility model for, a many power supply circuit is proposed, include: the power supply comprises an alternating current load circuit, a direct current load circuit, an alternating current power supply for supplying power to the alternating current load circuit, a direct current power supply for supplying power to the direct current load circuit and a switching circuit for connecting the alternating current load circuit and the direct current load circuit;
when the alternating current power supply fails, the switching circuit converts direct current output by the direct current power supply into alternating current and supplies power to the alternating current load circuit;
and/or when the direct current load circuit is in fault, the switching circuit converts the alternating current output by the alternating current power supply into direct current and supplies power to the direct current load circuit.
Further, a switch QF1 is connected in series between the alternating current power supply and the alternating current load circuit; a switch QF2 is connected in series between the direct current power supply and the direct current load circuit;
when the switch QF1 is closed, the alternating current power supply supplies power to the alternating current load circuit; when the switch QF2 is closed, the DC power supply supplies power to the DC load circuit.
Further, the transfer circuit comprises a switch QF3, a switch QF4 and a bidirectional converter AC/DC, one end of the switch QF3 is connected between the switch QF1 and the alternating current load circuit, the other end of the switch QF3 is connected with the bidirectional converter AC/DC, the other end of the bidirectional converter AC/DC is connected with the switch QF4, and the other end of the switch QF4 is connected between the direct current load circuit and the switch QF 2.
Further, the bidirectional converter is started only when the switch QF3 and the switch QF4 are closed.
Further, a node A is arranged between the alternating current power supply and the switch QF1, a node B is arranged between the direct current power supply and the switch QF2, the switch QF3 is connected between the switch QF1 and the alternating current load circuit, a node C is arranged between the switch QF4 and the switch QF2 and the direct current load circuit, a node D is arranged between the switch QF4 and the direct current load circuit, and each node is provided with a detection device for detecting current and/or voltage.
Further, in a state where both the switch QF1 and the switch QF2 are closed:
when the voltage of the node A, C is zero, the voltage of the node B, D is not zero, and the current values of the nodes A, B, C, D are all smaller than a preset value, the QF1 is switched off, the switch QF3 is switched on, and the switch QF4 is switched off;
and/or when the voltage of the node A, C is zero, the voltage of the node B, D is not zero, the current value of the node B reaches a preset value, and the current values of the nodes A, C, D are all smaller than the preset value, the QF1 is switched off, and an early warning is sent to remind a worker to overhaul the direct-current load circuit and the direct-current power supply;
and/or when the voltage of the node C is zero and the voltage of the node A, B, D is not zero, an early warning is sent to remind a worker of repairing the switch QF 1;
and/or when the voltage of the node B, D is zero, the voltage of the node A, C is not zero, and the current value of the node A, B, C, D is smaller than a preset value, the switch QF2 is opened, the switch QF3 is closed, and the switch QF4 is closed;
and/or when the voltage of the node B, D is zero, the voltage of the node A, C is not zero, the current value of the node A reaches a preset value, and the current value of the node B, C, D is smaller than the preset value, the switch QF2 is turned off, and an early warning is sent to remind a worker to overhaul an alternating current load circuit and an alternating current power supply;
and/or when the voltage of the node D is zero and the voltage of the node A, B, C is not zero, an early warning is sent to remind a worker to overhaul the switch QF 2.
Further, the preset value is a current protection value of the multi-power supply loop power supply circuit.
Further, when the switch QF1, the switch QF3 and the switch QF4 are closed and the switch QF2 is opened, the bidirectional converter is started, and converts the alternating current flowing out from the alternating current power supply into direct current to supply power to the direct current load circuit;
and/or when the switch QF2, the switch QF3 and the switch QF4 are closed and the switch QF1 is opened, the bidirectional converter is started, and converts the direct current flowing out from the direct current power supply into the alternating current to supply power to the alternating current load circuit.
Further, in a case where the switch QF1, the switch QF2, the switch QF3, and the switch QF4 are all closed:
when the voltage of the node A, B, C, D is not zero, the current of the node A reaches a preset value, and the current of the node B, C, D is smaller than the preset value, starting an auxiliary power supply mode of the bidirectional converter AC/DC to supply auxiliary power to the AC load circuit;
and/or when the voltage of the node A, B, C, C is not zero, the current of the node B reaches a preset value, and the current of the node A, C, D is smaller than the preset value, starting an auxiliary power supply mode of the bidirectional converter AC/DC to supply auxiliary power to the direct current load circuit.
The utility model also provides an electrical system, electrical system adopts above-mentioned many power supply circuit.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
1. the power supply is switched, so that the practicability of the standby power supply can be reduced, and the cost is saved.
2. The power supply with two or more power supply specifications is switched to supply power, and the power supply can be suitable for equipment with different power supply specifications.
3. The alternating current load module and the direct current load module can be provided with a plurality of loads and can be suitable for the problems of a plurality of loop devices.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
FIG. 1 is a schematic diagram of a single power supply and a dual power supply in the prior art;
fig. 2 is a schematic diagram of the structure of the multi-power-supply-loop power supply circuit of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of an embodiment of the invention, and not to imply that every embodiment of the invention must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 2, the present invention provides a multi-power-supply loop power supply circuit, which includes an ac load circuit, a dc load circuit, an ac power supply connected to the ac load circuit, a dc power supply connected to the dc load circuit, and a switching circuit connected to the ac load circuit and the dc load circuit, wherein the switching circuit is used to switch the current of another circuit to the fault circuit and supply power to the fault circuit when one circuit fails, specifically, when the ac power supply fails, the switching circuit converts the dc power outputted from the dc power supply into ac power and supplies power to the ac load circuit, and when the dc load circuit fails, the switching circuit converts the ac power outputted from the ac power supply into dc power and supplies power to the dc load circuit.
Specifically, a switch QF1 is connected in series between the ac load circuit and the ac power supply, a switch QF2 is connected in series between the dc load circuit and the dc power supply, the ac power supply supplies power to the ac load circuit when the switch QF1 is closed, and the dc power supply supplies power to the dc load circuit when the switch QF2 is closed.
The switching circuit comprises a bidirectional converter AC/DC, a switch QF3 and a switch QF4, wherein one end of the switch QF3 is connected between the switch QF1 and the alternating current load circuit, the other end of the switch QF3 is connected with the bidirectional converter AC/DC, the other end of the bidirectional converter AC/DC is connected with the switch QF4, and the other end of the switch QF4 is connected between the switch QF2 and the direct current load circuit.
The bidirectional converter is started only when the switch QF3 and the switch QF4 are closed simultaneously, when an alternating current power supply fails, the switch QF1 is opened, the switch QF2, the switch QF3 and the switch QF4 are closed, the bidirectional converter is started, direct current flowing out from the direct current power supply is converted into alternating current to supply power to an alternating current load circuit, when the direct current power supply fails, the switch QF2 is opened, the switch QF1, the switch QF3 and the switch QF4 are closed, the bidirectional converter is started, and the alternating current output by the alternating current power supply is converted into the direct current to supply power to the direct current load circuit.
A node A is arranged between an alternating current power supply and a switch QF1, a node B is arranged between the direct current power supply and a switch QF2, a node C is arranged between a switch QF3 and a switch QF1 which are connected with an alternating current load circuit, a node D is arranged between a switch QF4 and a switch QF2 which are connected with a direct current load circuit, and each node is provided with a device for detecting current and/or voltage.
Specifically, in a state where both the switch QF1 and the switch QF2 are closed:
when the voltage of the node A, C is zero, the voltage of the node B, D is not zero, and the current of the node A, B, C, D is smaller than a preset value, the switch QF1 is opened, and the switch QF2, the switch QF3 and the switch QF4 are closed.
At this time, it may be determined that the power supply of the a-point loop is abnormal, and may be abnormal of a substation or a line supplying power to the part, which results in that the part of the loop has no power supply. After the switch QF1 is disconnected and the switch QF2, the switch QF3 and the switch QF4 are closed, the bidirectional converter AC/DC is started, current flowing out of the direct current power supply can flow into the bidirectional converter AC/DC, and the bidirectional converter receives the current flowing out of the direct current power supply, converts the current into alternating current and supplies power to the alternating current load circuit.
When the voltage of the node A, C is zero, the voltage of the node B, D is not zero, the current value of the node B reaches a preset value, and the current value of the node A, C, D is smaller than the preset value, the switch QF1 is turned off, and an early warning is sent to remind a worker to overhaul an alternating current load circuit and an alternating current power supply.
At this time, it is determined that the power supply of the circuit a is abnormal, which may be the abnormal power supply of the substation or the abnormal power supply of the circuit, so that the circuit of the circuit has no power supply, and the bidirectional converter AC/DC is started after the confirmation of the staff. At this time, since the current at the node B reaches a preset value, if the bidirectional converter is restarted, a protection action is performed, otherwise the whole circuit is burned out. And reminding maintenance personnel to start the bidirectional converter AC/DC after confirmation.
When the voltage of the node C is zero and the voltage of the node A, B, D is not zero, an early warning is sent to remind a worker to overhaul the switch QF 1.
At this time, it is determined that the switch QF1 is abnormal, or the circuit is in a problem, or the equipment short circuit below point C causes the QF1 to trip, requiring inspection and maintenance.
When the voltage of the node B, D is zero, the voltage of the node A, C is not zero, and the current value of the node A, B, C, D is smaller than the preset value, the switch QF2 is opened, and the switch QF1, the switch QF3 and the switch QF4 are closed.
At this time, it is determined that the power supply of the B-point loop power supply is abnormal, which may be a substation abnormality or a line abnormality that supplies power to the part, resulting in that the part of the loop has no power supply. After the switch QF2 is disconnected and the switches QF1, QF3 and QF4 are closed, the bidirectional converter AC/DC is started, current flowing out of the alternating current power supply can flow into the bidirectional converter AC/DC, and the bidirectional converter receives the current flowing out of the alternating current power supply, converts the current into direct current and supplies power to the direct current load circuit.
When the voltage of the node B, D is zero, the voltage of the node A, C is not zero, the current value of the node A reaches a preset value, and the current value of the node B, C, D is smaller than the preset value, the switch QF2 is turned off, and an early warning is sent to remind a worker to overhaul the direct-current load circuit and the direct-current power supply.
At this time, it is determined that the power supply of the B circuit power supply is abnormal, which may be a substation abnormality or a line abnormality supplying power to the part, so that the part of the loop has no power supply, and the bidirectional converter AC/DC is started after the confirmation of a worker. At this time, since the current at the node a reaches a preset value, if the bidirectional converter is restarted, a protection action is performed, otherwise the whole circuit is burned out. And reminding maintenance personnel to start the bidirectional converter AC/DC after confirmation.
When the voltage of the node D is zero, the voltage of the node A, B, C is not zero, and an early warning is sent to remind a worker to overhaul the switch QF 2.
At this time, it is determined that the switch QF2 is abnormal, or the circuit of the circuit is in a problem, or the equipment short circuit below point D causes the QF2 to trip, requiring inspection and maintenance.
The preset value is a current protection value of the multi-power-supply-loop power supply circuit, and can also be set to be slightly smaller than the protection value.
Under the condition that the switch QF1, the switch QF2, the switch QF3 and the switch QF4 are all closed, when the voltage of a node A, B, C, D is not zero, the current of a node A reaches a preset value and the current of a node B, C, D is smaller than the preset value, an auxiliary power supply mode of the bidirectional converter AC/DC is started to provide auxiliary power supply for the alternating current load circuit;
at this time, it is determined that the power required in the circuit has become large, and the current in the circuit has already approached the protection value, and at this time, the device is put into operation, and it is highly likely that the protection operation is performed. And when the auxiliary power supply mode of the converter is started, the increased equipment power is provided by the converter, the converter can bear part of power (current), the power (current) of the point A cannot be increased, and the protection action cannot occur.
When the voltage of the node A, B, C, D is not zero, the current of the node B reaches a preset value, and the current of the node A, C, D is smaller than the preset value, an auxiliary power supply mode of the bidirectional converter AC/DC is started to provide auxiliary power for the direct current load circuit.
At this time, the current in the circuit is already close to the protection value, and at this time, the device is put into operation, so that the protection action is very likely. And when the auxiliary power supply mode of the converter is started, the increased equipment power is provided by the converter, the converter can bear part of power (current), the power (current) of the point B cannot be increased, and the protection action cannot occur.
The control strategy and control mode described above for 2 power supplies are also applicable to more loops extending in pairs of 3 and more.
The utility model also provides an electrical system, electrical system adopts above-mentioned many power supply circuit.
Compared with the prior art, the utility model discloses need not all increase stand-by power supply in every return circuit and prevent the outage, can be directly when the circuit breaks down the outage, through the mains operated in the second return circuit, practiced thrift stand-by power supply's use, the cost is reduced, simultaneously, two kinds of power specifications can be different, can be applicable to the equipment of different specifications, and direct current load module and alternating current load module can connect a plurality of equipment, can be applicable to a plurality of equipment return circuits.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A multiple power supply loop power supply circuit comprising: the load circuit of exchanging, direct current load circuit, give the alternating current power supply of alternating current load circuit power supply and give the direct current power supply of direct current load circuit power supply, its characterized in that: the switching circuit is connected with the alternating current load circuit and the direct current load circuit;
when the alternating current power supply fails, the switching circuit converts direct current output by the direct current power supply into alternating current and supplies power to the alternating current load circuit;
and/or when the direct current load circuit is in fault, the switching circuit converts the alternating current output by the alternating current power supply into direct current and supplies power to the direct current load circuit.
2. The multi-power-supply-loop power supply circuit as claimed in claim 1, wherein a switch QF1 is connected in series between the ac power supply and the ac load circuit; a switch QF2 is connected in series between the direct current power supply and the direct current load circuit;
when the switch QF1 is closed, the alternating current power supply supplies power to the alternating current load circuit; when the switch QF2 is closed, the DC power supply supplies power to the DC load circuit.
3. The multi power supply loop power supply circuit as claimed in claim 2, wherein the transfer circuit comprises a switch QF3, a switch QF4 and a bidirectional converter AC/DC, the switch QF3 is connected between the switch QF1 and the AC load circuit at one end and the bidirectional converter AC/DC at the other end, the bidirectional converter AC/DC is connected to the switch QF4 at the other end, and the switch QF4 is connected between the DC load circuit and the switch QF2 at the other end.
4. The multi power supply loop power supply circuit as claimed in claim 3, wherein the bi-directional converter AC/DC is started only when the switches QF3 and QF4 are closed.
5. A multi-power-supply circuit power supply circuit as claimed in claim 3, wherein a node a is provided between the ac power supply and the switch QF1, a node B is provided between the dc power supply and the switch QF2, a node C is provided between the switch QF3 and the ac load circuit, a node D is provided between the switch QF4 and the dc load circuit, and each node is provided with a detection device for detecting current and/or voltage.
6. The multi-power-supply-loop power supply circuit as claimed in claim 5, wherein in a state where both the switch QF1 and the switch QF2 are closed:
when the voltage of the node A, C is zero, the voltage of the node B, D is not zero, and the current values of the nodes A, B, C, D are all smaller than a preset value, the QF1 is switched off, the switch QF3 is switched on, and the switch QF4 is switched off;
and/or when the voltage of the node A, C is zero, the voltage of the node B, D is not zero, the current value of the node B reaches a preset value, and the current values of the nodes A, C, D are all smaller than the preset value, the QF1 is switched off, and an early warning is sent to remind a worker to overhaul the direct-current load circuit and the direct-current power supply;
and/or when the voltage of the node C is zero and the voltage of the node A, B, D is not zero, an early warning is sent to remind a worker of repairing the switch QF 1;
and/or when the voltage of the node B, D is zero, the voltage of the node A, C is not zero, and the current value of the node A, B, C, D is smaller than a preset value, the switch QF2 is opened, the switch QF3 is closed, and the switch QF4 is closed;
and/or when the voltage of the node B, D is zero, the voltage of the node A, C is not zero, the current value of the node A reaches a preset value, and the current value of the node B, C, D is smaller than the preset value, the switch QF2 is turned off, and an early warning is sent to remind a worker to overhaul an alternating current load circuit and an alternating current power supply;
and/or when the voltage of the node D is zero and the voltage of the node A, B, C is not zero, an early warning is sent to remind a worker to overhaul the switch QF 2.
7. The multi-power-supply-loop power supply circuit of claim 6 wherein the predetermined value is a current protection value of the multi-power-supply-loop power supply circuit.
8. The multi-power-supply-loop power supply circuit as claimed in claim 6, wherein when the switch QF1,
When the switch QF3 and the switch QF4 are closed and the switch QF2 is disconnected, the bidirectional converter is started, and the alternating current flowing out from the alternating current power supply is converted into direct current to supply power to the direct current load circuit;
and/or when the switch QF2, the switch QF3 and the switch QF4 are closed and the switch QF1 is opened, the bidirectional converter is started, and converts the direct current flowing out from the direct current power supply into the alternating current to supply power to the alternating current load circuit.
9. The multi-power-supply-loop power supply circuit as claimed in claim 4, wherein, when the switch QF1, the switch QF2, the switch QF3 and the switch QF4 are all closed:
when the voltage of the node A, B, C, D is not zero, the current of the node A reaches a preset value, and the current of the node B, C, D is smaller than the preset value, starting an auxiliary power supply mode of the bidirectional converter AC/DC to supply auxiliary power to the AC load circuit;
and/or when the voltage of the node A, B, C, C is not zero, the current of the node B reaches a preset value, and the current of the node A, C, D is smaller than the preset value, starting an auxiliary power supply mode of the bidirectional converter AC/DC to supply auxiliary power to the direct current load circuit.
10. An electrical system employing a multiple power supply loop supply circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022568130.9U CN213279272U (en) | 2020-11-09 | 2020-11-09 | Multi-power-supply-loop power supply circuit and electrical system |
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| CN202022568130.9U CN213279272U (en) | 2020-11-09 | 2020-11-09 | Multi-power-supply-loop power supply circuit and electrical system |
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| CN213279272U true CN213279272U (en) | 2021-05-25 |
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