Ice-melting direct-current power box

Abstract

The utility model discloses an ice-melting DC power box, and relates to the field of ice melting, in the scheme, a current-limiting filtering module is arranged to reduce the influence of the environment on the DC transmission process, and a phase selection isolation knife switch module is arranged to select the output of DC electric energy according to the actual needs of a load. A rectification module, a phase selection isolation knife switch and a plurality of current-limiting filtering modules are arranged in a shell, the rectification module is used for converting accessed alternating current into corresponding direct current electric energy, and the current-limiting filtering modules carry out current-limiting filtering on the direct current electric energy; the phase selection isolation knife switch module can select to transmit the direct current electric energy after current limiting and filtering to the corresponding load so as to melt ice on the surface of the corresponding load, all the components do not need to be arranged on a truck in a scattered mode, and cable arrangement of the whole truck can be more neat; in addition, according to the scheme, all the components are arranged in the shell, so that the influence of severe weather can be avoided, and the safety of the equipment is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of ice melting, in particular to an ice melting DC power supply box. Background Art

[0002] At present, the transmission and distribution lines are well-connected, with large east-west and north-south spans. In winter, many important transmission and distribution lines will be covered with ice, and winter is the peak season for electricity consumption. In order to ensure the safe operation of the large power grid and reliable power supply in winter, line de-icing work is essential. Among them, DC de-icing technology has been widely used because of its safety.

[0003] Currently, my country has a diverse range of DC de-icing devices, including fixed, mobile, segmented, and expandable series. These devices can be used on lines ranging from 10 kV to 1000 kV, rapidly heating and melting ice covering tens or even hundreds of kilometers of lines within an hour. Mobile de-icing power supplies are typically distributed across trucks. This scattered arrangement of components occupies a large space, necessitating the use of larger trucks for loading. However, interconnecting cables between components and within the trucks also create a cluttered cabling arrangement. Furthermore, because the components are dispersed across the trucks and exposed to the elements, current de-icing operations often involve rain and snow. Even with rainproof and moisture-proof designs, these components are susceptible to adverse weather conditions, which can easily lead to equipment failures. Utility Model Content

[0004] The purpose of the present utility model is to provide an ice-melting DC power supply box. In this solution, a current limiting filter module is provided to reduce the impact of the environment on the DC transmission process. A phase-selection isolation switch module is provided to select the output of DC power according to the actual needs of the load. The rectifier module, the phase-selection isolation switch, and several current limiting filter modules are all provided inside the shell. There is no need to disperse the above components on the truck, which can make the cable arrangement of the entire vehicle more neat. In addition, because the present solution arranges all components inside the shell, it can avoid the impact of bad weather and greatly improve the safety of the equipment.

[0005] In order to solve the above technical problems, the utility model provides an ice-melting DC power supply box, comprising: a housing, a rectifier module, a phase-selective isolation switch module and a plurality of current-limiting filter modules, wherein the rectifier module, the phase-selective isolation switch and each current-limiting filter module are all arranged inside the housing;

[0006] The input end of the rectifier module is connected to the AC power, the positive output end is connected to the positive input end of the phase-selective isolation switch module, and the negative output end is connected to the negative input end of the phase-selective isolation switch module, for converting the AC power into corresponding DC power;

[0007] Each of the current limiting and filtering modules is connected in parallel with the rectifier devices on each bridge arm of the rectifier module in a one-to-one correspondence, and is used to perform corresponding current limiting and filtering operations on the DC power;

[0008] The phase-selective isolation switch module further includes at least two output terminals, which are used to output the DC power to a load through the two selected output terminals.

[0009] Optionally, it also includes: a current sensor and a voltage sensor;

[0010] The current sensor and the input end of the rectifier module are used to collect the current value corresponding to the alternating current;

[0011] The voltage sensor is connected to the positive output terminal and the negative output terminal of the rectifier module respectively, and is used to collect the voltage value of the DC power after current limiting and filtering.

[0012] Optionally, also include:

[0013] a glass window, wherein the glass window is embedded in the surface of the housing;

[0014] A lighting lamp is arranged inside the shell.

[0015] Optionally, it also includes: AC high-voltage wall bushings, several DC high-voltage wall bushings;

[0016] The AC high-voltage wall bushing is arranged outside the connection point where the input end of the rectifier module is connected to the AC power;

[0017] Each of the DC high-voltage wall bushings is arranged in a one-to-one correspondence outside the output end of the phase-selection isolation switch module.

[0018] Optionally, also include:

[0019] A heating dehumidifier is arranged inside the shell.

[0020] Optionally, also include:

[0021] a cooling fan, the cooling fan being arranged inside the housing;

[0022] A heat dissipation component is arranged inside the shell.

[0023] Optionally, also include:

[0024] Insulating material is applied on the inner surface of the shell.

[0025] Optionally, the phase-selective isolation switch module includes: M first switches and M second switches corresponding to the M first switches one by one;

[0026] The first ends of the M first switches are all connected to the positive output end of the rectifier module, and the second ends are connected to the corresponding loads;

[0027] The first ends of the M second knife switches are all connected to the negative output end of the rectifier module, and the second ends are connected to the corresponding loads. The first knife switches and the non-corresponding second knife switches are closed at the same time.

[0028] Optionally, the rectifier module includes N rectifier modules, and the N rectifier modules include: a first rectifier module, a second rectifier module...an Nth rectifier module, where N is not less than 2;

[0029] The positive output end of the i-th rectifier module is the positive total output end of the rectifier module;

[0030] The negative output end of the j-th rectifier module is the negative total output end of the rectifier module, 1≤i<j≤N.

[0031] Optionally, the rectifier module further includes: N-1 first switches, N-1 second switches, and N-1 third switches;

[0032] The first end of each first switching switch is connected to the negative output end of the i-th rectifier module, and the second end is connected to the positive output end of the k-th rectifier module, 1≤i<k≤j≤N;

[0033] The first end of each second switching switch is connected to the positive output end of the i-th rectifier module, and the second end is connected to the positive output end of the (i+1)-th rectifier module;

[0034] A first end of each of the third switching switches is connected to the negative output end of the i-th rectifier module, and a second end of each of the third switching switches is connected to the negative output end of the (i+1)-th rectifier module.

[0035] The purpose of the present utility model is to provide an ice-melting DC power supply box. In this solution, a current limiting filter module is provided to reduce the impact of the environment on the DC transmission process. A phase-selection isolation switch module is provided to select the output of DC power according to the actual needs of the load. The rectifier module, the phase-selection isolation switch, and several current limiting filter modules are all provided inside the shell. Among them, the rectifier module is used to convert the input AC power into corresponding DC power, the current limiting filter module will perform current limiting filtering on the DC power, and the phase-selection isolation switch module will select to transmit the DC power after current limiting filtering to the corresponding load to melt the ice on the surface of the corresponding load. There is no need to arrange the above-mentioned components in a dispersed manner on the truck, which can make the cable arrangement of the entire vehicle more neat. In addition, because the present solution arranges all components inside the shell, it can avoid the influence of bad weather and greatly improve the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0037] Figure 1 This is a structural diagram of an ice-melting DC power supply box provided by the utility model;

[0038] Figure 2 This is an outline diagram of an ice-melting DC power supply box provided by the utility model;

[0039] Figure 3 This is a schematic diagram of the internal wiring of an ice-melting DC power supply box provided by the utility model. DETAILED DESCRIPTION

[0040] The core of the present utility model is to provide an ice-melting DC power supply box. In this solution, a current limiting filter module is provided to reduce the impact of the environment on the DC transmission process. A phase-selection isolation switch module is provided to select the output of DC power according to the actual needs of the load. The rectifier module, the phase-selection isolation switch, and several current limiting filter modules are all provided inside the shell. There is no need to disperse the above components on the truck, which can make the cable arrangement of the entire vehicle more neat. In addition, because this solution arranges all components inside the shell, it can avoid the impact of bad weather, greatly improving the safety of the equipment.

[0041] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an ice-melting DC power supply box provided by the present invention. The ice-melting DC power supply box includes: a housing 1, a rectifier module 2, a phase-selective isolation switch module 3, and a plurality of current-limiting filter modules 4. The rectifier module 2, the phase-selective isolation switch module, and each current-limiting filter module 4 are all disposed inside the housing 1.

[0043] The input end of the rectifier module 2 is connected to the AC power, the positive output end is connected to the positive input end of the phase-selective isolation switch module 3, and the negative output end is connected to the negative input end of the phase-selective isolation switch module 3, which is used to convert the AC power into the corresponding DC power.

[0044] Each current limiting filter module 4 is connected in parallel with the rectifier devices on each bridge arm of the rectifier module 2 in a one-to-one correspondence, and is used to perform corresponding current limiting and filtering operations on the DC power;

[0045] The phase-selective isolation switch module 3 further includes at least two output terminals, which are used to output DC power to the load through the two selected output terminals.

[0046] In the present invention, considering that the existing ice-melting components are exposed on the surface of the truck and are easily affected by the adverse weather environment, and the components are distributed at various positions of the truck, the cables of each component and the cables inside the truck can easily cause messy wiring, so the rectifier module 2, the phase-selection isolation knife switch module 3, and several current limiting filter modules 4 of this solution are uniformly arranged in the ice-melting DC power supply box, and considering that the ice-melting DC power supply box generally works in rainy and snowy weather, the present solution reduces the impact of the environment on the DC transmission process by setting the current limiting filter module 4, and considering the needs of the load in actual applications, the present solution selects the output of DC power according to the actual needs of the load by setting the phase-selection isolation knife switch module 3. On the one hand, this solution can help each component resist the influence of the adverse weather environment, and on the other hand, because the components are agreed to be arranged in a box, the wiring between each component will not be entangled with the wiring inside the truck, and will not cause messy wiring, so it can make the cable layout of the whole vehicle more neat and improve the safety of the equipment.

[0047] It should be noted that, in practical applications, the rectifier device in the rectifier module 2 may be a diode, or may be a controlled power electronic device such as a MOS (MOSFET, Metal Oxide Semiconductor Field Effect Transistor) tube.

[0048] It should also be noted that the present solution installs the phase-selection isolation switch module 3 in the ice-melting DC power supply box, and the phase-selection isolation switch module 3 can be directly operated on the control panel of the ice-melting DC power supply box. This not only shortens the length of the interconnected copper busbar from the output of the rectifier module 2 to the phase-selection isolation switch module 3, but also allows for more intuitive operation and control. The integrated design of DC power supply control and output can effectively save production and manufacturing costs, greatly reduce the space required for installation, and provide feasibility for the box-type installation of the ice-melting DC power supply. The vehicle-mounted box-type installation of the ice-melting DC power supply can make the vehicle-mounted ice-melting system more centralized, with a compact and beautiful structure. Since the equipment is installed inside the box, the overall protection is strong, and it can provide better protection in the face of external rain and snow weather, which can reduce the failure rate of the equipment, enhance the safety of the equipment, and thus greatly improve the service life of the equipment.

[0049] It should also be noted that the present invention requires the control and distribution circuits of the ice-melting DC power supply, as well as the phase-selection isolation switch module 3, to be placed within the DC power supply cabinet for an integrated design. Due to the limited size of the vehicle-mounted cabinet, the design of the ice-melting DC power supply cabinet must meet both size restrictions and fully consider the safety distance within the ice-melting DC power supply cabinet (the power supply output voltage is generally above DC 2000V). By reselecting rectifier components, protective devices, and heat sinks, including higher-power rectifier tubes to reduce the number of rectifier components used, the space occupied by components and heat sinks can be effectively conserved. Simultaneously, by adjusting the layout of internal components and rationally utilizing cabinet space, the control and distribution circuits, as well as the phase-selection isolation switch module 3, can be rationally integrated into the cabinet.

[0050] The integrated design of DC power supply control and output effectively reduces manufacturing costs and significantly reduces installation space, making box-type installation of DC power supplies feasible. The vehicle-mounted box-type installation of the DC ice-melting power supply allows for a more centralized vehicle-mounted ice-melting system, resulting in a compact and attractive structure. Since all equipment is installed within the box, the overall protection is strong, providing better protection against rain and snow, reducing equipment failure rates, enhancing equipment safety, and significantly extending equipment life.

[0051] It should also be noted that the appearance of the ice melting DC power supply box is as follows Figure 2As shown, it mainly consists of a power cabinet (housing 1), AC high-voltage wall bushings (A1, A2, B1, B2, C1, C2), DC high-voltage wall bushings (Ea, Eb, Ec), two sets of three-phase uncontrolled rectifier bridges (when the rectifier module 2 includes two rectifier sub-modules), a phase-selection isolation knife switch module 3, a radiator assembly, a cooling fan, a rectifier control detection circuit, a phase-selection isolation knife switch control circuit, a power distribution circuit, a resistance-capacitance protection device, a lightning arrester, a current sensor, a high-voltage voltage sensor, a lighting lamp, a heating dehumidifier, a glass window, an insulating material, etc., and the corresponding name, quantity and serial number of each component are as follows: Figure 2 As shown in the table in the lower right corner.

[0052] The main wiring diagram of the ice melting DC power supply box is as follows Figure 3 As shown in the figure, the DC power supply has two sets of AC input lines, which are the AC input terminals of the DC power supply. The AC input terminals are connected to a 12-pulse on-load tap-changing inverter transformer (the AC output of the inverter transformer is connected to the de-icing DC power supply box). The six valve-side wiring terminals output by the inverter transformer correspond one-to-one with the AC input terminals of the DC power supply. The DC power supply is rectified by two sets of three-phase uncontrolled rectifier bridges. The two sets of three-phase bridges can be connected in series or parallel to form a series circuit or a parallel circuit, thereby outputting two different DC rated parameters to meet the de-icing requirements of different lines. The DC output directly corresponds to the phase-selective isolation switch group. At the same time, the switch control circuit and the rectifier control circuit are designed together. The control and output corresponding operations can be operated at one time on the DC power supply cabinet, and the corresponding data and status indicators can also be directly viewed, which greatly saves the time of de-icing output connection and also improves operational reliability. This time, this solution places the control and distribution circuit of the ice-melting DC power supply and the phase-selection isolation switch module 3 into the ice-melting DC power supply box for an integrated design, which greatly reduces the overall size of the ice-melting system and provides the possibility of box-type installation design for the ice-melting DC power supply, thereby providing a strong guarantee for the service life of the ice-melting DC power supply and the integration of operation output.

[0053] The present embodiment provides an ice-melting DC power supply box. In this solution, a current-limiting filter module 4 is provided to reduce the impact of the environment on the DC transmission process. A phase-selection isolation switch module 3 is provided to select the output of DC power according to the actual needs of the load. The rectifier module 2, the phase-selection isolation switch, and several current-limiting filter modules 4 are all provided inside the shell 1, wherein the rectifier module 2 is used to convert the input AC power into corresponding DC power, the current-limiting filter module 4 will perform current-limiting filtering on the DC power, and the phase-selection isolation switch module 3 will select to transmit the DC power after current-limiting filtering to the corresponding load to melt the ice on the surface of the corresponding load. There is no need to disperse the above-mentioned components on the truck, which can make the cable layout of the entire vehicle more neat. In addition, because the present solution arranges all components inside the ice-melting DC power supply box, it can avoid the influence of bad weather, greatly improving the safety of the equipment.

[0054] Based on the above embodiment:

[0055] As an optional embodiment, it further includes: a current sensor and a voltage sensor;

[0056] The current sensor and the input end of the rectifier module 2 are used to collect the current value corresponding to the alternating current;

[0057] The voltage sensor is connected to the positive output terminal and the negative output terminal of the rectifier module 2 respectively, and is used to collect the voltage value of the DC power after current limiting and filtering.

[0058] In the present utility model, taking into account that overvoltage or overcurrent may easily occur in the working circuits of the components inside the ice-melting DC power supply box, the present solution further adds a current sensor and a voltage sensor. The current sensor is used to monitor the current of the AC power connected to the circuit in real time, and the voltage sensor is used to monitor the voltage of the DC power output by the rectifier module 2 in the circuit in real time. This facilitates users or maintenance personnel to make timely judgments on the safety of the internal circuit of the ice-melting DC power supply box based on the current value collected by the current sensor and the voltage value collected by the voltage sensor, thereby improving the safety of the solution.

[0059] As an optional embodiment, the method further includes:

[0060] A glass window, the glass window being embedded in the surface of the housing 1;

[0061] The lighting lamp is arranged inside the housing 1 .

[0062] In the present invention, considering that if only an AC rectifier module 2, a phase selection isolation switch module 3, and several current limiting filter modules 4 are arranged inside the shell 1 of the ice-melting DC power supply box, maintenance personnel or users will not be able to observe the actual working conditions of the internal components. If a component fails, it will not be discovered in time, and in serious cases it may even cause a safety failure. Therefore, this solution adds a glass window and a lighting lamp, wherein the glass window is embedded in the surface of the shell 1, and the lighting lamp is arranged inside the shell 1, so that users or maintenance personnel can observe the working conditions of the internal components of the ice-melting DC power supply box through the glass window, and observe more conveniently through the illumination of the lighting lamp, which is convenient for actual use.

[0063] As an optional embodiment, it further includes: an AC high-voltage wall bushing, a plurality of DC high-voltage wall bushings;

[0064] The AC high-voltage wall bushing is arranged outside the connection point where the input end of the rectifier module 2 is connected to the AC power;

[0065] Each DC high-voltage wall bushing is arranged outside the output end of the phase-selection isolation switch module 3 in a one-to-one correspondence.

[0066] In the present invention, taking into account the existence of AC input and DC output in the ice-melting DC power supply box, that is, the rectifier module 2 is connected to the AC power and the phase-selection isolation switch module 3 is connected to the load, so in order to prevent leakage during the AC input and DC output processes, this scheme adds an AC high-voltage wall bushing to the outside of the connection point of the input end of the AC power and the rectifier module 2, and adds multiple DC high-voltage wall bushings to the outside of the output end of the phase-selection isolation switch module 3 to insulate the AC input and DC output processes, thereby greatly improving the safety of the scheme.

[0067] As an optional embodiment, the method further includes:

[0068] The heating dehumidifier is arranged inside the shell 1.

[0069] In the present invention, considering that the ice-melting DC power supply box will work in rainy and snowy weather in most cases, the temperature inside the ice-melting DC power supply box will be relatively low and the humidity will be relatively high. The working efficiency of each component working in such an internal environment is easily affected. Therefore, this solution adds a heating dehumidifier inside the ice-melting DC power supply box. The heating dehumidifier is used to increase the temperature inside the ice-melting DC power supply box and reduce the humidity inside the ice-melting DC power supply box.

[0070] As an optional embodiment, the method further includes:

[0071] A cooling fan is provided inside the housing 1;

[0072] The heat dissipation component is arranged inside the shell 1.

[0073] In the present invention, it is taken into account that when the rectifier module 2 is working, the temperature of the rectifier devices on its various bridge arms will also increase with the increase of working time. If the time required for the load to melt the ice is too long, the temperature of the rectifier devices will be particularly high. When the temperature of the rectifier devices is too high, on the one hand, it will affect the working efficiency of the rectifier module 2, and in severe cases it will also cause safety failures. Therefore, this solution adds a cooling fan and a heat dissipation component. The heat dissipation component can export the temperature of the rectifier devices to the outside of the ice-melting DC power supply box to a certain extent, and accelerate the entire heat conduction and heat dissipation process through the cooling fan, thereby reducing the temperature of the rectifier devices as much as possible and improving the efficiency and safety of the solution.

[0074] As an optional embodiment, the method further includes:

[0075] Insulating material, the insulating material is laid on the inner surface of the shell 1.

[0076] In the present invention, taking into account that there is both AC input and DC output during the operation of the ice-melting DC power supply box, and the ice-melting DC power supply box also performs the work of converting AC power into DC power, in order to prevent leakage during the power transmission and power conversion process, the present solution lays insulating material on the inner surface of the shell 1, which greatly improves the safety and reliability of the solution.

[0077] As an optional embodiment, the phase isolation switch module 3 includes: M first switches and M second switches corresponding to the M first switches;

[0078] The first ends of the M first switches are connected to the positive output end of the rectifier module 2, and the second ends are connected to the corresponding loads;

[0079] The first ends of the M second knife switches are all connected to the negative output end of the rectifier module 2, and the second ends are connected to the corresponding loads. The first knife switches and the non-corresponding second knife switches are closed at the same time.

[0080] In the utility model, the phase-selective isolation switch module 3 is provided with M first switches and M corresponding second switches, wherein the first switch and the corresponding second switch cannot be closed at the same time, any two first switches cannot be closed at the same time, and any two second switches cannot be closed at the same time. When the load needs to be connected, only the first switch and the non-corresponding second switch can be allowed to be closed at the same time, and then the DC power after current limiting and filtering is transmitted to the load to melt the ice on the load surface, thereby ensuring the integrity of the solution.

[0081] As an optional embodiment, the rectifier module 2 includes N rectifier modules, and the N rectifier modules include: a first rectifier module, a second rectifier module...an Nth rectifier module, where N is not less than 2;

[0082] The positive output terminal of the i-th rectifier module is the positive total output terminal of the rectifier module 2;

[0083] The negative output end of the jth rectifier module is the negative total output end of the rectifier module 2, 1≤i<j≤N.

[0084] In the present invention, considering that the ice-melting DC power supply box can be connected to a variety of loads in actual applications, and the voltage or current required by each load may be different, in order to meet the needs of various loads, N rectifier modules are provided in the rectifier module 2 of this solution, and the positive output end of the i-th rectifier module is used as the positive total output end of the rectifier module 2, and the negative output end of the j-th rectifier module is used as the negative total output end of the rectifier module 2. For example, if the rectifier module 2 includes 5 rectifier modules, the positive output end of the first rectifier module can be set as the positive total output end of the rectifier module 2, and the negative output end of the fourth rectifier module can be set as the negative total output end of the rectifier module 2 according to the needs of the load. The positive output end of the second rectifier module can also be set as the positive total output end of the rectifier module 2, and the negative output end of the third rectifier module can be set as the negative total output end of the rectifier module 2, and so on, so as to meet the needs of different loads, meet various working scenarios, adapt to various loads, and facilitate practical use.

[0085] It should be noted that in actual applications, if the rectifier module 2 includes 5 rectifier modules, then multiple rectifier modules can be selected to be connected in series or in parallel according to the actual needs of the load. Of course, connecting any two rectifier modules in series or in parallel is the minimum case.

[0086] As an optional embodiment, the rectifier module 2 further includes: N-1 first switches, N-1 second switches, and N-1 third switches;

[0087] The first end of each first switching switch is connected to the negative output end of the i-th rectifier module, and the second end is connected to the positive output end of the k-th rectifier module, 1≤i<k≤j≤N;

[0088] The first end of each second switch is connected to the positive output end of the i-th rectifier module, and the second end is connected to the positive output end of the (i+1)-th rectifier module;

[0089] A first end of each third switch is connected to the negative output end of the i-th rectifier module, and a second end of each third switch is connected to the negative output end of the (i+1)-th rectifier module.

[0090] In the present invention, considering that when the load demand changes, it is necessary to switch the connection mode of each rectifier module, in order to facilitate switching, this solution adds N-1 first switching switches, N-1 second switching switches and N-1 third switching switches in the rectifier module 2, wherein the first switching switch is a switch that controls whether any two rectifier modules are connected in series, and the second switching switch and the third switching switch are switches that control whether any two rectifier modules are connected in parallel. For example: if the rectifier module 2 includes 6 rectifier modules, then according to the actual needs of the load, the first rectifier module, the third rectifier module, and the fifth rectifier module can be controlled to be connected in series, and the third rectifier module and the sixth rectifier module can be controlled to be connected in parallel, and so on. This solution can switch the connection mode of each rectifier module by remote control or manual control of the switching switch, thereby improving the efficiency of the solution.

[0091] It should also be noted that, in actual applications, the connection mode of each rectifier module can be controlled by setting a switching switch, or by adding wires. For example, if the rectifier module 2 has two rectifier modules, the negative output end of the first rectifier module and the positive output end of the second rectifier module can be connected by wires, and the first rectifier module and the second rectifier module can be connected in series; similarly, if the rectifier module 2 has two rectifier modules, the negative output end of the first rectifier module and the negative output end of the second rectifier module can be connected by wires, and the positive output end of the first rectifier module and the positive output end of the second rectifier module can be connected by another wire, and the first rectifier module and the second rectifier module can be connected in parallel. Of course, the way of adding wires can be done manually or through an automatic control device, where the automatic control device can be a controlled robotic arm or a plurality of relays, wherein one end of the coil of each relay is connected to the controller and the other end is grounded, and one end of the normally open contact of the coil is connected to the negative output end or the positive output end of the corresponding rectifier module, and the other end of the normally open contact of the coil is connected to the negative output end or the positive output end of another corresponding rectifier module. When the controller outputs an electrical signal, the normally open contact of the relay is closed, and the corresponding rectifier modules are connected in parallel or in series.

[0092] It should be noted that, in this specification, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0093] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An ice melting DC power supply box, characterized in that: include: A housing, a rectifier module, a phase-selection isolation switch module, and a plurality of current-limiting filter modules, wherein the rectifier module, the phase-selection isolation switch, and each current-limiting filter module are all arranged inside the housing; The input end of the rectifier module is connected to the AC power, the positive output end is connected to the positive input end of the phase-selective isolation switch module, and the negative output end is connected to the negative input end of the phase-selective isolation switch module, for converting the AC power into corresponding DC power; Each of the current limiting and filtering modules is connected in parallel with the rectifier devices on each bridge arm of the rectifier module in a one-to-one correspondence, and is used to perform corresponding current limiting and filtering operations on the DC power; The phase-selective isolation switch module further includes at least two output terminals, which are used to output the DC power to a load through the two selected output terminals.

2. The ice-melting DC power supply box according to claim 1, characterized in that: Also includes: Current sensors and voltage sensors; The current sensor and the input end of the rectifier module are used to collect the current value corresponding to the alternating current; The voltage sensor is connected to the positive output terminal and the negative output terminal of the rectifier module respectively, and is used to collect the voltage value of the DC power after current limiting and filtering.

3. The ice-melting DC power supply box according to claim 1, characterized in that: Also includes: a glass window, wherein the glass window is embedded in the surface of the housing; A lighting lamp is arranged inside the shell.

4. The ice-melting DC power supply box according to claim 1, characterized in that: Also includes: AC high-voltage wall bushings and several DC high-voltage wall bushings; The AC high-voltage wall bushing is arranged outside the connection point where the input end of the rectifier module is connected to the AC power; Each of the DC high-voltage wall bushings is arranged in a one-to-one correspondence outside the output end of the phase-selection isolation switch module.

5. The ice-melting DC power supply box according to claim 1, characterized in that: Also includes: A heating dehumidifier is arranged inside the shell.

6. The ice-melting DC power supply box according to claim 1, characterized in that: Also includes: a cooling fan, the cooling fan being arranged inside the housing; A heat dissipation component is arranged inside the shell.

7. The ice-melting DC power supply box according to claim 1, characterized in that: Also includes: Insulating material is applied on the inner surface of the shell.

8. The ice-melting DC power supply box according to claim 1, characterized in that: The phase-selection isolation switch module includes: M first switches and M second switches corresponding to the M first switches one by one; The first ends of the M first switches are all connected to the positive output end of the rectifier module, and the second ends are connected to the corresponding loads; The first ends of the M second knife switches are all connected to the negative output end of the rectifier module, and the second ends are connected to the corresponding loads. The first knife switches and the non-corresponding second knife switches are closed at the same time.

9. The ice-melting DC power supply box according to any one of claims 1 to 8, characterized in that: The rectifier module includes N rectifier modules, and the N rectifier modules include: a first rectifier module, a second rectifier module, an i-th rectifier module ... a j-th rectifier module ... an N-th rectifier module, where N is not less than 2; The positive output end of the i-th rectifier module is the positive total output end of the rectifier module; The negative output end of the j-th rectifier module is the negative total output end of the rectifier module, 1≤i<j≤N.

10. The ice-melting DC power supply box according to claim 9, characterized in that: The rectifier module further includes: N-1 first switching switches, N-1 second switching switches and N-1 third switching switches; The first end of each first switching switch is connected to the negative output end of the i-th rectifier module, and the second end is connected to the positive output end of the k-th rectifier module, 1≤i<k≤j≤N; The first end of each second switching switch is connected to the positive output end of the i-th rectifier module, and the second end is connected to the positive output end of the (i+1)-th rectifier module; A first end of each of the third switching switches is connected to the negative output end of the i-th rectifier module, and a second end of each of the third switching switches is connected to the negative output end of the (i+1)-th rectifier module.

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