CN219779849U - Office end equipment with reverse power supply - Google Patents
Office end equipment with reverse power supply Download PDFInfo
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- CN219779849U CN219779849U CN202322277070.9U CN202322277070U CN219779849U CN 219779849 U CN219779849 U CN 219779849U CN 202322277070 U CN202322277070 U CN 202322277070U CN 219779849 U CN219779849 U CN 219779849U
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Abstract
The utility model discloses a local side device with reverse power supply, which comprises: the device comprises a rectifying module, a power supply switching module, a power supply monitoring module and an inversion module; the input end of the rectifying module is connected with the alternating current input, and the output end of the rectifying module is connected with the first input end of the power supply switching module; the first output end of the power supply switching module is connected with a direct-current power supply line; the input end of the power supply monitoring module is connected with the alternating current input, and the output end of the power supply monitoring module is connected with the second input end of the power supply switching module; the input end of the inversion module is connected with the second output end of the power supply switching module, and the output end of the inversion module is connected with the alternating current output. The utility model can effectively monitor the abnormality of the input power supply of the local side equipment, and when the input power supply is abnormal, the remote direct current equipment connected with the local side equipment is switched to be the power supply, the direct current provided by the remote direct current equipment is reversely input, the remote direct current equipment can reversely supply power to important equipment around the powered-off local side equipment, the normal work of the important equipment in the power-off process is maintained, and the loss caused by the power-off process is effectively reduced.
Description
Technical Field
The utility model relates to the technical field of remote direct current power supply equipment, in particular to a local side equipment with reverse power supply.
Background
Under the normal power supply condition, in the whole bidirectional direct current remote power supply system, all remote power supply devices in a corresponding loop are provided with two sets of local side devices for supplying power, the two sets of local side devices take different power grid lines as alternating current input power sources, and the alternating current is converted into direct current through a rectifying module in the local side devices and is transmitted to the remote direct current devices connected with the alternating current input power sources to realize power supply. When a power failure such as power failure occurs in a power grid line where one local side device is located, the other local side device is used for continuously supplying power to the remote device, so that important devices around the local side device at one power failure side have no emergency preparation time, large-area power failure occurs immediately, normal work cannot be performed, and a large amount of loss is caused.
Disclosure of Invention
Based on this, it is necessary to provide a reverse power supply local side device to solve the problem that peripheral important devices on the power-off side cannot work normally after the local side device is powered off in the prior art.
The utility model provides a local side device with reverse power supply, which comprises:
the device comprises a rectifying module, a power supply switching module, a power supply monitoring module and an inversion module;
the input end of the rectifying module is connected with the alternating current input, and the output end of the rectifying module is connected with the first input end of the power supply switching module;
the first output end of the power supply switching module is connected with a direct-current power supply line;
the input end of the power supply monitoring module is connected with the alternating current input, and the output end of the power supply monitoring module is connected with the second input end of the power supply switching module;
the input end of the inversion module is connected with the second output end of the power supply switching module, and the output end of the inversion module is connected with the alternating current output;
the power supply monitoring module is used for monitoring whether the alternating current input is abnormal or not and sending the monitoring condition to the power supply switching module so that the power supply switching module can execute power supply switching according to the monitoring condition;
the power supply switching module is used for disconnecting the first input end of the power supply switching module from the output end of the rectifying module when the abnormal input of the alternating current is monitored, and switching the first output end of the power supply switching module into a current input end so as to input the direct current provided by the direct current power line;
the inversion module is used for inverting the direct current provided by the direct current power line to form alternating current output, and reverse power supply is realized on equipment with abnormal alternating current input through the direct current power line.
Further, the power monitoring module includes:
the system comprises an A-phase terminal, a B-phase terminal, a C-phase terminal, a first voltage transformer T1, a second voltage transformer T2, a third voltage transformer T3 and an acquisition monitoring module, wherein,
the A-phase terminal, the B-phase terminal and the C-phase terminal are respectively connected with one phase of alternating current input;
the acquisition monitoring module is connected with the second input end of the power supply switching module;
the first pin of the A-phase terminal is connected with the second pin of the A-phase terminal through a piezoresistor R10 and is also connected with the second pin of the first voltage transformer T1; the second pin of the A-phase terminal is connected with the first pin of the first voltage transformer T1 through a resistor R1 and a resistor R3; the third pin of the first voltage transformer T1 is connected with the positive electrode of the diode D1, and the negative electrode of the diode D1 is connected with the fourth pin of the first voltage transformer T1 through a resistor R5, a protection diode D4 and a capacitor C1 which are connected in parallel and grounded; the cathode of the diode D1 is also connected with the acquisition monitoring module;
the connection mode of the B-phase terminal and the second voltage transformer T2 and the collection monitoring module, and the connection mode of the C-phase terminal and the third voltage transformer T3 and the collection monitoring module are the same as the connection mode of the A-phase terminal and the first voltage transformer T1 and the collection monitoring module.
Further, the power supply switching module includes:
transistor Q1, switching module, control module, switching control power supply, wherein,
the control module is connected with the base electrode of the triode Q1 through a resistor R22; the control module is also used as a second input end of the power supply switching module and is connected with the acquisition monitoring module;
the base electrode of the triode Q1 is also connected with the emitter electrode of the triode Q1 through a resistor R23 and grounded; the collector of the triode Q1 is also connected with the anode of a diode D21, and the cathode of the diode D21 is also connected with a switching control power supply through a resistor R21;
the output terminal J1 of the switching module is used as a first output end of the power switching module and is connected with a direct-current power line; the input terminal J2 of the switching module is used as a first input end of the power switching module and is connected with the output end of the rectifying module; the input terminal J3 of the switching module is used as a second output end of the power switching module and is connected with the input end of the inversion module;
the switching pin A2 of the switching module is connected between the collector of the triode Q1 and the anode of the diode D21, and the switching pin A1 of the switching module is connected between the cathode of the diode D21 and the resistor R21.
Further, the inversion module includes:
a capacitor branch and three bridge arm branches;
the capacitor branch and the three bridge arm branches are respectively connected in parallel between the positive electrode and the negative electrode of the input end of the inversion module;
the capacitor branch circuit at least comprises one capacitor;
each bridge arm branch comprises at least two switching tubes connected in series, two ends of each switching tube are also connected in parallel in an inverse manner, and the cathode of each diode is connected with the anode of the input end of the inversion module;
at least one inductor is arranged between the connection point of the two switching tubes on each bridge arm and the output end of the inversion module.
Further, each bridge arm branch of the inversion module is divided into an upper bridge arm and a lower bridge arm, and each upper bridge arm and each lower bridge arm at least comprise a switching tube;
when the inversion module works, the switching tubes in the upper bridge arm and the lower bridge arm of each bridge arm branch are alternately conducted, and three switching tubes in the inversion module are kept to be conducted simultaneously at any moment, so that three-phase alternating currents with 120-degree phase angles are formed for output.
Further, when the inversion module works, the switching tubes in the upper bridge arm and the lower bridge arm of each bridge arm branch are alternately conducted, and the switching tubes of the two upper bridge arms and the switching tubes of the one lower bridge arm are kept conducting in the inversion module at any moment, or the switching tubes of the one upper bridge arm and the switching tubes of the two lower bridge arms are conducted, so that three-phase alternating currents with phase angles of 120 degrees are formed for output.
Further, the switching tube is an IGBT.
Further, the reverse power supply local side device further includes: the communication interface is connected with the power supply switching module and is used for feeding back the power supply switching execution condition of the power supply switching module.
The utility model adopts the technical scheme and has the following beneficial effects:
the utility model discloses a reverse power supply local side device, which is provided with a power supply monitoring module, wherein the power supply monitoring module is used for monitoring whether an input power supply of the local side device is abnormal or not in real time, when the input power supply is abnormal, the power supply of the abnormal input power supply is timely disconnected through the power supply switching module, the remote direct current device connected with the abnormal input power supply is switched to be a power supply, direct current provided by the remote direct current device is reversely input, and then the direct current is inverted into alternating current by an inversion module, so that the remote direct current device reversely supplies power to important devices around the power-off local side device, normal operation of the important devices during power-off is maintained, and loss caused by power-off is effectively reduced.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
fig. 1 is a schematic structural diagram of a reverse-powered local side device in an embodiment.
Fig. 2 is a schematic circuit diagram of a power monitoring module 300 in one embodiment.
Fig. 3 is a schematic circuit diagram of a power switching module 200 in one embodiment.
Fig. 4 is a schematic circuit diagram of an inverter module 400 in one embodiment.
Reference numerals illustrate: the power supply comprises a rectifying module 100, a power supply switching module 200, a power supply monitoring module 300 and an inversion module 400.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the examples herein, which are within the scope of the utility model, will be within the purview of one of ordinary skill in the art without the exercise of inventive faculty.
As shown in fig. 1, in one embodiment, a reverse-powered local side device is provided, including:
the power supply system comprises a rectification module 100, a power supply switching module 200, a power supply monitoring module 300 and an inversion module 400;
the input end of the rectifying module 100 is connected with the alternating current input, and the output end of the rectifying module 100 is connected with the first input end of the power supply switching module 200;
the first output end of the power supply switching module 200 is connected with a direct-current power supply line;
the input end of the power supply monitoring module 300 is connected with the alternating current input, and the output end is connected with the second input end of the power supply switching module 200;
the input end of the inversion module 400 is connected with the second output end of the power supply switching module 200, and the output end is connected with the alternating current output;
the power supply monitoring module 300 is configured to monitor whether the ac power input is abnormal, and send the monitored condition to the power supply switching module 200, so that the power supply switching module 200 performs power supply switching according to the monitored condition;
the power supply switching module 200 is configured to disconnect a first input end of the power supply switching module 200 from an output end of the rectifying module 100 when an abnormal ac input is detected, and switch the first output end of the power supply switching module 200 to a current input end, so that dc power supplied by the dc power line is input;
the inverter module 400 is configured to invert the dc power provided by the dc power line to form an ac output, so as to implement reverse power supply to the device with abnormal ac input through the dc power line.
Under the normal power supply condition, two sets of local side equipment are usually arranged, different power grid lines are used as alternating current input power sources, the alternating current is converted into direct current through a rectifying module in the local side equipment, and the direct current is transmitted to far-end direct current equipment connected with the alternating current to realize power supply. When a power failure such as power failure occurs in a power grid line where one local side device is located, the other local side device is used for continuously supplying power to the remote side device, so that important devices around the local side device at one power failure side have no emergency preparation time, large-area power failure occurs immediately, normal work cannot be performed, and a large amount of loss is caused.
In order to solve the problem, in this embodiment, a local side device with reverse power supply is provided, which not only includes a rectifying module 100 for converting ac power input into dc power under the condition of normal power supply, but also includes a power monitoring module 300 for monitoring whether the input power to the local side device is abnormal in real time, when the input power is abnormal, the connection with the rectifying module 100 is disconnected through the power switching module 200, that is, the power supply of the abnormal input power is disconnected, the current output end is switched to the current input end, the dc power provided by the dc power line of the remote dc device connected to the local side device is reversely input, and is then inverted to ac power by the inverting module 400, so that the reverse power supply of the remote dc device to important devices around the powered local side device is realized, and when the input power is recovered to be normal, the power is switched to be normally supplied through the input power through the power switching module 200.
According to the embodiment, when the input power supply of the local side equipment is powered off, the power supply of the abnormal input power supply is timely disconnected, the remote direct current equipment connected with the local side equipment is switched to be the power supply, reverse power supply is carried out on important equipment around the powered off local side equipment, normal operation of the important equipment in the power off process is maintained, and loss caused by the power off is effectively reduced.
Further, as shown in fig. 2, in one embodiment, the power monitoring module 300 includes:
the system comprises an A-phase terminal, a B-phase terminal, a C-phase terminal, a first voltage transformer T1, a second voltage transformer T2, a third voltage transformer T3 and an acquisition monitoring module, wherein,
the phase A terminal, the phase B terminal and the phase C terminal are respectively connected with one phase of alternating current in the alternating current input;
the acquisition monitoring module is connected with the second input end of the power supply switching module 200;
the first pin of the A-phase terminal is connected with the second pin of the A-phase terminal through a piezoresistor R10 and is also connected with the second pin of the first voltage transformer T1; the second pin of the A-phase terminal is connected with the first pin of the first voltage transformer T1 through a resistor R1 and a resistor R3; the third pin of the first voltage transformer T1 is connected with the positive electrode of the diode D1, and the negative electrode of the diode D1 is connected with the fourth pin of the first voltage transformer T1 and grounded through a resistor R5, a protection diode D4 and a capacitor C1 which are connected in parallel respectively; the cathode of the diode D1 is also connected with the acquisition monitoring module;
the connection mode of the B-phase terminal and the second voltage transformer T2 and the collection monitoring module, and the connection mode of the C-phase terminal and the third voltage transformer T3 and the collection monitoring module are the same as the connection mode of the A-phase terminal and the first voltage transformer T1 and the collection monitoring module:
the first pin of the B-phase terminal is connected with the second pin of the B-phase terminal through a piezoresistor R11 and is also connected with the second pin of the second voltage transformer T2; the second pin of the B-phase terminal is connected with the first pin of the second voltage transformer T2 through a resistor R2 and a resistor R4; the third pin of the second voltage transformer T2 is connected with the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected with the fourth pin of the second voltage transformer T2 and grounded through a resistor R8, a protection diode D5 and a capacitor C2 which are connected in parallel respectively; the cathode of the diode D2 is also connected with the acquisition monitoring module;
the first pin of the C-phase terminal is connected with the second pin of the C-phase terminal through a piezoresistor R12 and is also connected with the second pin of a third voltage transformer T3; the second pin of the C-phase terminal is connected with the first pin of the third voltage transformer T3 through a resistor R6 and a resistor R7; the third pin of the third voltage transformer T3 is connected with the positive electrode of the diode D3, and the negative electrode of the diode D3 is connected with the fourth pin of the third voltage transformer T3 and grounded through a resistor R9, a protection diode D6 and a capacitor C3 which are connected in parallel respectively; the negative electrode of the diode D3 is also connected with the acquisition monitoring module.
In the specific implementation process, each phase of input three-phase alternating current can be connected to a terminal corresponding to A, B, C through zero lines, the same is adopted as B, C by taking an A phase as an example, R1 and R3 are current limiting protection resistors, R10 is a piezoresistor, high voltage is prevented from entering a rear end module, the high voltage is changed into low voltage in a collectable range of a collecting and monitoring module after passing through a voltage transformer, a diode D1 converts alternating current voltage into direct current voltage, R5 is a load of the transformer, D4 is a protection diode, the collecting and monitoring module is prevented from being damaged by high voltage, and C1 is a filter capacitor, so that clutter is removed. When three phases or one of the phases in the alternating current are powered off, the acquisition side of the corresponding acquisition monitoring module cannot acquire a voltage value, the abnormal input power supply is judged to be monitored, and abnormal monitoring conditions are sent to the power supply switching module, so that the power supply switching module switches off the power supply of the abnormal input power supply, and the remote direct current equipment connected with the power supply switching module is switched to be the power supply, so that the reverse power supply of important equipment around the powered-off local equipment is realized. Specifically, the acquisition monitoring module in this embodiment may be a single-chip microcomputer.
Further, as shown in fig. 3, in an embodiment, the power switching module 200 includes:
transistor Q1, switching module, control module, switching control power supply, wherein,
the control module is connected with the base electrode of the triode Q1 through a resistor R22; the control module is also used as a second input end of the power supply switching module 200 and is connected with the acquisition monitoring module;
the base electrode of the triode Q1 is also connected with the emitter electrode of the triode Q1 through a resistor R23 and grounded; the collector of the triode Q1 is also connected with the anode of a diode D21, and the cathode of the diode D21 is also connected with a switching control power supply through a resistor R21;
the output terminal J1 of the switching module is used as a first output end of the power switching module 200 and is connected with a direct-current power line; the input terminal J2 of the switching module is used as a first input end of the power switching module 200 and is connected with the output end of the rectifying module 100; the input terminal J3 of the switching module is used as a second output end of the power switching module 200 and is connected with the input end of the inversion module 400;
the switching pin A2 of the switching module is connected between the collector of the transistor Q1 and the anode of the diode D21, and the switching pin A1 of the switching module is connected between the cathode of the diode D21 and the resistor R21.
In a specific implementation process, the switch in the switching module may be a double pole double throw switch, the highest passing voltage is direct current 1000V, the output terminal J1 is used as a first output end of the power switching module 200, connected to a direct current power line, the input terminal J2 is used as a first input end of the power switching module 200, connected to an output end of the rectifying module 100, used as a power supply input of a local device, and the input terminal J3 is used as a second output end of the power switching module 200, connected to an input end of the inverting module 400. The switching control power supply can be a 24V direct current power supply, and the control module and the triode control the on-off and the current flow direction, so that the power supply switching function of the power supply switching module is achieved. When the power supply is switched, the control module controls to disconnect the input terminal J2 from the output end of the rectifying module 100, and switches the output terminal J1 to the current input end, so that the direct current provided by the direct current power line is input through the terminal J1. Specifically, the control module in this embodiment may be a single-chip microcomputer.
Further, as shown in fig. 4, in an embodiment, the inverter module 400 includes:
a capacitor branch and three bridge arm branches;
the capacitor branch and the three bridge arm branches are respectively connected in parallel between the positive electrode and the negative electrode of the input end of the inversion module 400;
the capacitor branch circuit comprises capacitors C31 and C32;
each bridge arm branch comprises two switching tubes Q31-Q36 connected in series, two ends of each switching tube are also connected in parallel with a diode D31-D36 in an anti-parallel mode, and the negative electrode of the diode is connected with the positive electrode of the input end of the inversion module 400;
an inductor L1-L3 is further disposed between the connection point of the two switching tubes on each bridge arm and the output end N of the inverter module 400.
Further, each bridge arm branch of the inversion module is divided into an upper bridge arm and a lower bridge arm, and each upper bridge arm and each lower bridge arm comprise a switching tube;
when the inversion module works, the switching tubes in the upper bridge arm and the lower bridge arm of each bridge arm branch are alternately conducted, and three switching tubes in the inversion module are kept to be conducted simultaneously at any moment, so that three-phase alternating currents with 120-degree phase angles are formed for output.
Specifically, when the inversion module works, the switching tubes in the upper bridge arm and the lower bridge arm of each bridge arm branch are alternately conducted, and the switching tubes of the two upper bridge arms and the switching tubes of the one lower bridge arm are kept conducting in the inversion module at any moment, or the switching tubes of the one upper bridge arm and the switching tubes of the two lower bridge arms are conducted, so that three-phase alternating currents with phase angles of 120 degrees are formed for output.
More specifically, the switching tube in the inversion module is an IGBT.
In the specific implementation process, the working mode of the three-phase inversion module is a 180-degree conduction mode:
the conduction angle of each bridge arm is 120 degrees;
switching tubes in an upper bridge arm and a lower bridge arm of the same bridge arm branch are alternately conducted, so that the conducting angles of all phases are different by 120 degrees in sequence;
at any instant, 3 switching tubes are simultaneously conducted, and each conversion is performed between an upper bridge arm and a lower bridge arm of the same phase, so that the switching tubes are also called longitudinal current.
In the operation process, the control part of the switching tube can be controlled in sequence to obtain the output amplitude which is half of the input voltage, the waveforms of the three-phase output are the same, the phases of the output are sequentially different by 120 degrees, and thus the three-phase alternating current power supply can be output.
In addition, in the on-off control of the inverter module, in order to prevent the two switching tubes on the same phase from being simultaneously conducted to cause the short circuit of the power supply on the direct current side, the switching tubes must be disconnected and then conducted, i.e. dead time is reserved.
Further, the office device with reverse power supply further includes: the communication interface is connected with the power switching module 200 and is used for feeding back the power switching execution condition of the power switching module.
The above disclosure is only illustrative of the preferred embodiments of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
It is to be understood that the same or similar parts in the above embodiments may be referred to each other, and that in some embodiments, the same or similar parts in other embodiments may be referred to.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (8)
1. A reverse powered local side device, comprising:
the device comprises a rectifying module, a power supply switching module, a power supply monitoring module and an inversion module;
the input end of the rectifying module is connected with the alternating current input, and the output end of the rectifying module is connected with the first input end of the power supply switching module;
the first output end of the power supply switching module is connected with a direct-current power supply line;
the input end of the power supply monitoring module is connected with the alternating current input, and the output end of the power supply monitoring module is connected with the second input end of the power supply switching module;
the input end of the inversion module is connected with the second output end of the power supply switching module, and the output end of the inversion module is connected with the alternating current output;
the power supply monitoring module is used for monitoring whether the alternating current input is abnormal or not and sending the monitoring condition to the power supply switching module so that the power supply switching module can execute power supply switching according to the monitoring condition;
the power supply switching module is used for disconnecting the first input end of the power supply switching module from the output end of the rectifying module when the abnormal input of the alternating current is monitored, and switching the first output end of the power supply switching module into a current input end so as to input the direct current provided by the direct current power line;
the inversion module is used for inverting the direct current provided by the direct current power line to form alternating current output, and reverse power supply is realized on equipment with abnormal alternating current input through the direct current power line.
2. The reverse-powered local side device of claim 1, wherein the power monitoring module comprises:
the system comprises an A-phase terminal, a B-phase terminal, a C-phase terminal, a first voltage transformer T1, a second voltage transformer T2, a third voltage transformer T3 and an acquisition monitoring module, wherein,
the A-phase terminal, the B-phase terminal and the C-phase terminal are respectively connected with one phase of alternating current input;
the acquisition monitoring module is connected with the second input end of the power supply switching module;
the first pin of the A-phase terminal is connected with the second pin of the A-phase terminal through a piezoresistor R10 and is also connected with the second pin of the first voltage transformer T1; the second pin of the A-phase terminal is connected with the first pin of the first voltage transformer T1 through a resistor R1 and a resistor R3; the third pin of the first voltage transformer T1 is connected with the positive electrode of the diode D1, and the negative electrode of the diode D1 is connected with the fourth pin of the first voltage transformer T1 through a resistor R5, a protection diode D4 and a capacitor C1 which are connected in parallel and grounded; the cathode of the diode D1 is also connected with the acquisition monitoring module;
the connection mode of the B-phase terminal and the second voltage transformer T2 and the collection monitoring module, and the connection mode of the C-phase terminal and the third voltage transformer T3 and the collection monitoring module are the same as the connection mode of the A-phase terminal and the first voltage transformer T1 and the collection monitoring module.
3. The reverse-powered local side device according to claim 2, wherein the power switching module comprises:
transistor Q1, switching module, control module, switching control power supply, wherein,
the control module is connected with the base electrode of the triode Q1 through a resistor R22; the control module is also used as a second input end of the power supply switching module and is connected with the acquisition monitoring module;
the base electrode of the triode Q1 is also connected with the emitter electrode of the triode Q1 through a resistor R23 and grounded; the collector of the triode Q1 is also connected with the anode of a diode D21, and the cathode of the diode D21 is also connected with a switching control power supply through a resistor R21;
the output terminal J1 of the switching module is used as a first output end of the power switching module and is connected with a direct-current power line; the input terminal J2 of the switching module is used as a first input end of the power switching module and is connected with the output end of the rectifying module; the input terminal J3 of the switching module is used as a second output end of the power switching module and is connected with the input end of the inversion module;
the switching pin A2 of the switching module is connected between the collector of the triode Q1 and the anode of the diode D21, and the switching pin A1 of the switching module is connected between the cathode of the diode D21 and the resistor R21.
4. A reverse powered local side device as defined in claim 3, wherein said inverter module comprises:
a capacitor branch and three bridge arm branches;
the capacitor branch and the three bridge arm branches are respectively connected in parallel between the positive electrode and the negative electrode of the input end of the inversion module;
the capacitor branch circuit at least comprises one capacitor;
each bridge arm branch comprises at least two switching tubes connected in series, two ends of each switching tube are also connected in parallel in an inverse manner, and the cathode of each diode is connected with the anode of the input end of the inversion module;
at least one inductor is arranged between the connection point of the two switching tubes on each bridge arm and the output end of the inversion module.
5. The reverse power supply local side equipment according to claim 4, wherein each bridge arm branch of the inverter module is divided into an upper bridge arm and a lower bridge arm, and each of the upper bridge arm and the lower bridge arm at least comprises a switching tube;
when the inversion module works, the switching tubes in the upper bridge arm and the lower bridge arm of each bridge arm branch are alternately conducted, and three switching tubes in the inversion module are kept to be conducted simultaneously at any moment, so that three-phase alternating currents with 120-degree phase angles are formed for output.
6. The reverse power supply local side device according to claim 5, wherein when the inverter module works, the switching tubes in the upper and lower bridge arms of each bridge arm branch are alternately conducted, and the switching tubes of the two upper bridge arms and the switching tubes of the one lower bridge arm are kept conducting in the inverter module at any moment, or the switching tubes of the one upper bridge arm and the switching tubes of the two lower bridge arms are conducted to form three-phase alternating currents with phase angles different by 120 degrees for output.
7. The reverse-powered local side device of claim 4, wherein the switching tube is an IGBT.
8. A reverse powered local side device according to any of claims 1-7, further comprising: the communication interface is connected with the power supply switching module and is used for feeding back the power supply switching execution condition of the power supply switching module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202322277070.9U CN219779849U (en) | 2023-08-24 | 2023-08-24 | Office end equipment with reverse power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322277070.9U CN219779849U (en) | 2023-08-24 | 2023-08-24 | Office end equipment with reverse power supply |
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| CN219779849U true CN219779849U (en) | 2023-09-29 |
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