CN216216574U - Photovoltaic direct-drive induction heating device and equipment - Google Patents
Photovoltaic direct-drive induction heating device and equipment Download PDFInfo
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- CN216216574U CN216216574U CN202122693962.8U CN202122693962U CN216216574U CN 216216574 U CN216216574 U CN 216216574U CN 202122693962 U CN202122693962 U CN 202122693962U CN 216216574 U CN216216574 U CN 216216574U
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Abstract
The present disclosure relates to a photovoltaic direct drive induction heating device and apparatus. This photovoltaic directly drives induction heating device includes: uncontrolled rectifier circuit, direct current-direct current converting circuit, inverter circuit and resonant load, wherein: the uncontrolled rectifying circuit is connected with the direct current-direct current conversion circuit, the direct current-direct current conversion circuit is connected with the inverter circuit through the direct current bus, and the inverter circuit is connected with the resonant load; the uncontrolled rectifying circuit is connected with an alternating current power grid; the alternating current power grid is used for supplying power to the resonant load through the uncontrolled rectifying circuit, the direct current-direct current conversion circuit and the inverter circuit; the photovoltaic panel is connected with the direct current bus; and the photovoltaic panel is used for supplying power to the resonant load through the direct current bus and the inverter circuit, so that the photovoltaic directly drives the induction heating device. The photovoltaic direct-drive power supply system has the advantages that the photovoltaic direct-drive power supply is adopted, the sunlight irradiation effect is the best in daytime, the power generation power is the highest, the power utilization peak value in a factory can be effectively reduced, and the power utilization cost is reduced.
Description
Technical Field
The present disclosure relates to the field of induction heating devices, and in particular, to a photovoltaic direct-drive induction heating device and apparatus.
Background
The power supply part of the induction heating device is usually supplied with 380V three-phase alternating current, the alternating current is converted into direct current through the uncontrolled rectifying circuit, and the direct current is converted into high-frequency alternating current through the inverter circuit to supply power for the resonant load circuit. The power of one induction heating device is dozens of kilowatts to hundreds of kilowatts, and a plurality of induction heating devices are arranged on one set of induction welding production line of a factory to work simultaneously, so that the power load of the factory building is increased greatly in the same time. The induction welding factory building has high power consumption, so that the peak power consumption in the factory is huge and the electricity price is high.
Disclosure of Invention
In view of at least one of the above technical problems, the present disclosure provides a photovoltaic direct-drive induction heating device and equipment, which adopt photovoltaic direct-drive power supply, have the best sunlight irradiation effect and the highest power generation power in daytime, and can effectively reduce the peak value of power utilization in a plant area and reduce the power utilization cost.
According to an aspect of the present disclosure, there is provided a photovoltaic direct-drive induction heating device, including an uncontrolled rectifier circuit, a dc-dc conversion circuit, an inverter circuit, and a resonant load, wherein:
the uncontrolled rectifying circuit is connected with the direct current-direct current conversion circuit, the direct current-direct current conversion circuit is connected with the inverter circuit through the direct current bus, and the inverter circuit is connected with the resonant load;
the uncontrolled rectifying circuit is connected with an alternating current power grid; the alternating current power grid is used for supplying power to the resonant load through the uncontrolled rectifying circuit, the direct current-direct current conversion circuit and the inverter circuit;
the photovoltaic panel is connected with the direct current bus; and the photovoltaic panel is used for supplying power to the resonant load through the direct current bus and the inverter circuit, so that the photovoltaic directly drives the induction heating device.
In some embodiments of the present disclosure, the resonant load is an induction heating coil.
In some embodiments of the present disclosure, the inverter circuit is configured to invert a direct current into a high-frequency alternating current, and the high-frequency alternating current flows through an inside of the induction heating coil, so that the induction heating coil generates an alternating electromagnetic field to heat the metal workpiece to be processed.
In some embodiments of the present disclosure, the dc-dc conversion circuit is configured to control a dc voltage of a photovoltaic panel side, and provide a wide dc voltage optimizing adjustment range of the photovoltaic panel.
In some embodiments of the present disclosure, the dc-dc conversion circuit is a buck-boost chopper circuit or a buck chopper circuit, wherein an optimal adjustment range of the dc voltage of the photovoltaic panel provided by the buck-boost chopper circuit is greater than an optimal adjustment range of the dc voltage of the photovoltaic panel provided by the buck chopper circuit.
In some embodiments of the present disclosure, the photovoltaic panel and the ac power grid are configured to supply power to the photovoltaic direct-drive induction heating device in a dual power supply manner.
In some embodiments of the present disclosure, the photovoltaic panel is configured to independently supply power to the photovoltaic direct-drive induction heating device when the photovoltaic power generation power is greater than or equal to the electric power used by the photovoltaic direct-drive induction heating device.
In some embodiments of the present disclosure, the photovoltaic panel and the ac power grid are used to jointly supply power to the photovoltaic direct-drive induction heating device in the case that the photovoltaic power generation power is greater than 0 and less than the power consumption power of the photovoltaic direct-drive induction heating device.
In some embodiments of the present disclosure, the ac power grid is configured to separately supply power to the photovoltaic direct-drive induction heating device when the photovoltaic power generation power is equal to 0.
In some embodiments of the present disclosure, the photovoltaic panel is configured to supply power to the photovoltaic direct-drive induction heating device in case of power failure or line maintenance of the ac power grid.
In some embodiments of the present disclosure, the transistor of the inverter circuit is used for regulating and controlling the output power of the photovoltaic direct-drive induction heating device under the condition that the photovoltaic panel is powered.
In some embodiments of the present disclosure, the transistors of the dc-dc conversion circuit are used to perform wide regulation on the dc bus voltage to track the maximum photovoltaic power generation power point in the case of power supply of the photovoltaic panel.
In some embodiments of the present disclosure, the transistor of the dc-dc conversion circuit is used for regulating and controlling the output power of the photovoltaic direct-drive induction heating device under the condition of supplying power to an ac power grid.
In some embodiments of the present disclosure, the photovoltaic direct drive induction heating apparatus further comprises a fuse and a circuit breaker, wherein:
the uncontrolled rectifying circuit is connected with an alternating current power grid through a three-phase power line;
fuse and circuit breaker establish ties and set up on the three-phase power supply line, wherein:
the fuse is used for fusing under the condition that the current on the power grid side is larger than the selected fuse fusing value when a fault occurs, so that a power supply loop of the alternating current power grid is disconnected;
the circuit breaker is used as a manual switch of a power supply loop of an alternating current power grid; and disconnecting the power supply loop of the alternating current power grid under the condition that the current on the power grid side is greater than the selected fuse fusing value of the fuse.
In some embodiments of the present disclosure, the photovoltaic direct drive induction heating apparatus further comprises a charging circuit, wherein:
the charging circuit is arranged on the three-phase power line in parallel and used for reducing current and reducing the charging speed of direct-current voltage on the rectified rear side when the photovoltaic direct-drive induction heating device is started; after the rectified rear side direct current charging is completed, the charging circuit is disconnected.
According to another aspect of the present disclosure, there is provided a photovoltaic direct-drive induction heating apparatus, comprising a photovoltaic panel and a photovoltaic direct-drive induction heating device as described in any of the above embodiments.
The photovoltaic direct-drive power supply system has the advantages that the photovoltaic direct-drive power supply is adopted, the sunlight irradiation effect is the best in daytime, the power generation power is the highest, the power utilization peak value in a factory can be effectively reduced, and the power utilization cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic topology of some embodiments of a related art ac grid powered induction heating apparatus.
Fig. 2 is a schematic topology diagram of further embodiments of a related art ac grid powered induction heating unit.
Fig. 3 is a schematic diagram of a power supply scheme topology structure of a photovoltaic grid-connected and induction heating device in the related art for power taking in a power grid.
Fig. 4 is a schematic view of some embodiments of a photovoltaic direct drive induction heating apparatus of the present disclosure.
Fig. 5 is a schematic view of a topological structure of the photovoltaic power generation direct-drive induction heating device of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic topology of some embodiments of a related art ac grid powered induction heating apparatus. Related art induction heating device products mostly adopt this kind of topological structure, and step-down chopper circuit wherein plays the most core power regulation function of induction heating device, through the duty cycle that changes the turn-on of the transistor among the step-down chopper circuit and through the duty cycle of adjusting the switch tube and switching-on and shutoff, adjusts chopper output voltage size to adjust chopper output, the power of inverter circuit input, thereby adjust induction heating equipment's output.
Fig. 2 is a schematic topology diagram of further embodiments of a related art ac grid powered induction heating unit. The scheme does not have the BUCK circuit, power regulation control is not carried out by controlling the on-off of a transistor of the BUCK circuit, but is carried out by controlling the on-off of the transistor by the inverter circuit, and the control algorithm of the scheme is complex and the control difficulty is high. The scheme takes power from a 380V power grid, and the power is converted into direct current through uncontrolled rectification and then is converted into high-frequency alternating current to supply power to a resonant load.
The inventor finds out through research that: the induction heating devices in the related art in the embodiment of fig. 1 or fig. 2 have high power, and the power consumption of a plurality of induction heating devices in a plurality of production lines of an induction welding factory building is large, so that the power load in the factory is large, the peak power consumption in the factory is huge, and the electricity price is high. In addition, when the urban network is in power failure or the line in the factory is overhauled, the welding production line needs to be stopped.
Fig. 3 is a schematic diagram of a power supply scheme topology structure of a photovoltaic grid-connected and induction heating device in the related art for power taking in a power grid. The induction heating device gets electricity from a 380V power grid, and the electricity is rectified into direct current in an uncontrolled way and then is inverted into high-frequency alternating current to supply power for a resonant load. A part of power supplied to the induction heating device by the 380V power grid is generated by the photovoltaic panel, inverted by the inverter and supplied to the grid.
The inventor finds out through research that: in the related art of the embodiment of fig. 3, a photovoltaic panel is laid on the top of a factory building, and solar energy is used for power generation. In the embodiment of fig. 3, photovoltaic power generation is converted into alternating current through an inverter and is supplied to a part of power loads in a plant in a grid-connected mode, so that the effect of reducing the power consumption of the power grid side is achieved. Direct current generated by the photovoltaic is converted into 380V alternating current through the inverter and then rectified into direct current for power supply through the uncontrolled rectifying circuit of the induction heating device. The process is subjected to two times of conversion, and each conversion has certain loss, so that the photovoltaic power generation utilization rate is low. The embodiment of fig. 3 is low in utilization rate from photovoltaic power generation at the top of the plant to the direct current side of the induction heating device, and much loss is wasted after two times of conversion.
In view of at least one of the above technical problems, the present disclosure provides a photovoltaic direct-drive induction heating device and apparatus, which are explained below by specific embodiments.
Fig. 4 is a schematic view of some embodiments of a photovoltaic direct drive induction heating apparatus of the present disclosure. As shown in fig. 4, the photovoltaic direct drive induction heating apparatus (photovoltaic direct drive induction heating apparatus) 30 of the present disclosure may include an uncontrolled rectifier circuit 31, a dc-dc conversion circuit 32, an inverter circuit 33, and a resonant load 34, wherein:
the uncontrolled rectifying circuit 31 is connected to a dc-dc conversion circuit 32, the dc-dc conversion circuit 32 is connected to an inverter circuit 33 via a dc bus 35, and the inverter circuit 33 is connected to a resonant load 34.
The uncontrolled rectifying circuit 31 is connected with an alternating current power grid; and the alternating current power grid is used for supplying power to the resonant load 34 through the uncontrolled rectifying circuit, the direct current-direct current conversion circuit 32 and the inverter circuit 33.
The photovoltaic panel is connected with a direct current bus 35; and the photovoltaic panel is used for supplying power to the resonant load 34 through the direct current bus 35 and the inverter circuit 33, so that the photovoltaic direct-drive induction heating device is realized.
In some embodiments of the present disclosure, the dc-dc conversion circuit 32 may be configured to control the dc voltage on the photovoltaic panel side, so as to provide a wide dc voltage optimizing and adjusting range for the photovoltaic panel.
In some embodiments of the present disclosure, the dc-dc conversion circuit 32 may be a buck-boost chopper circuit or a buck chopper circuit.
In some embodiments of the present disclosure, the optimal adjustment range of the dc voltage of the photovoltaic panel provided by the buck-boost chopper circuit is greater than the optimal adjustment range of the dc voltage of the photovoltaic panel provided by the buck chopper circuit, and the buck-boost chopper circuit is a more preferable scheme.
For the photovoltaic induction heating device product adopting the photovoltaic direct-drive scheme of the embodiment of the disclosure, due to the output characteristics of the photovoltaic panel, the photovoltaic panel can be ensured to be at the maximum output power point all the time only by carrying out wide-range change on the direct-current bus voltage, and the generated photovoltaic electric energy is the most.
Fig. 5 is a schematic view of a topological structure of the photovoltaic power generation direct-drive induction heating device of the present disclosure. As shown in fig. 5, the dc-dc conversion circuit 32 of the present disclosure employs a buck-boost chopper circuit (also known as buck-boost converter). The photovoltaic power is connected to the back end of the buck-boost chopper circuit in the main circuit topology of the photovoltaic direct-drive induction heating device provided by the disclosure, and the buck-boost chopper circuit in the main circuit topology of the photovoltaic direct-drive induction heating device provided by the disclosure can be accurately adjustedThe voltage on the photovoltaic panel side is the direct voltage of the direct current bus of the induction heating device. Due to the characteristics of the buck-boost chopper circuit, the direct-current voltage after the uncontrolled rectification part can be rectified
And then carrying out wide voltage reduction or voltage increase regulation to control the direct-current voltage of the photovoltaic panel at the moment, and carrying out wider optimization regulation on the direct-current voltage of the photovoltaic panel, so that the range of the maximum photovoltaic power generation of the photovoltaic system is enlarged, and sufficient generated energy is ensured to be supplied to the induction heating device for use.
Compared with the method that the electric energy generated by the photovoltaic is connected to the direct current bus of the induction heating device to be rectified at the rear end without control (the voltage of the direct current bus at the moment is a fixed value)
) Or the scheme (adjustable direct current bus voltage range 0 ~ 515V) of buck step-down circuit rear end of induction heating device, the above-mentioned embodiment of this disclosure can more widely adjust the direct current voltage (adjustable direct current bus voltage range 0 ~ 1000V) of photovoltaic board side, can make photovoltaic board generated energy keep the maximum value in longer time, consequently this scheme can increase the generated energy of photovoltaic board, make the system obtain bigger power generation power, under the same photovoltaic board installed capacity, the induction heating device's that can the adaptation capacity is higher.
The generated power on the photovoltaic panel of the embodiment of the disclosure changes with the voltage of the photovoltaic panel, and a single maximum point exists, so that the DC/DC converter can accurately adjust the voltage of the photovoltaic panel and the direct-current voltage of the direct-current bus of the induction heating device. The DC/DC converter controls the DC voltage of the photovoltaic panel side constantly, so that a wider photovoltaic panel DC voltage optimizing and adjusting range can be realized, the time for the photovoltaic system to keep the maximum photovoltaic power generation power is prolonged, and sufficient power generation amount is ensured to be supplied to the induction heating device for use. Compared with the scheme that electric energy generated by photovoltaic is directly connected to the direct current bus of the induction heating device without the DC/DC part, if the DC/DC part does not exist, the voltage of the photovoltaic panel is equal to the voltage (fixed value) of the direct current bus of the induction heating device, and under the scene, the power generation power of the photovoltaic panel is 20% -30% lower than that of the scheme provided by the patent. Therefore, the scheme provided by the embodiment of the disclosure can increase the power generation amount of the photovoltaic panel, so that the system can obtain larger power generation capacity. The capacity of the adaptive induction heating device is higher under the condition that the installation area of the photovoltaic plate is limited by the roof area of the photovoltaic plate, and the installation area of the same photovoltaic plate is the same as the installation capacity of the photovoltaic plate.
In some embodiments of the present disclosure, as shown in fig. 5, the transistors T1-T4 of the inverter circuit 33 are used for regulating and controlling the output power of the photovoltaic direct-drive induction heating device under the condition of power supply of the photovoltaic panel; the transistor VT1 of the dc-dc converter circuit 32 is used to perform wide regulation of the dc bus 35 voltage to track the maximum photovoltaic power generation power point in the case of photovoltaic panel power supply.
In some embodiments of the present disclosure, as shown in fig. 5, the transistor VT1 of the dc-dc conversion circuit 32 is used for regulating and controlling the output power of the photovoltaic direct-drive induction heating device under the condition of supplying power to the ac power grid.
In some embodiments of the present disclosure, the photovoltaic induction heating apparatus may adopt a power adjusting mode of adjusting power by the inverter bridge and adjusting power by the buck-boost chopper circuit. When photovoltaic power generation is carried out in the daytime, a buck-boost chopper circuit is adopted to carry out wide adjustment on the voltage of a direct current bus so as to track the maximum power point of the photovoltaic power generation and obtain the maximum power generation power, and at the moment, the photovoltaic induction heating device adopts a control mode of inverter bridge power adjustment; when photovoltaic power generation is not carried out at night, a control mode that an alternating current power grid supplies power and a buck-boost chopper circuit regulates voltage and power is adopted.
The method adopts the mode of uncontrolled rectification, buck-boost chopper circuit and direct drive.
In some embodiments of the present disclosure, the resonant load 34 is an induction heating coil, as shown in fig. 4 and 5.
In some embodiments of the present disclosure, an inverter circuit 33 for inverting the direct current into a high frequency alternating current flowing through the induction heating coil UoutInside, the induction heating coil generates an alternating electromagnetic field, the metal workpiece to be processed is placed in the induction heating coil, and alternating electricity is induced on the metal workpieceDue to the eddy current effect of the current in the metal, the metal workpiece to be processed is heated, and the process effects of induction welding, quenching and the like are realized.
In some embodiments of the present disclosure, as shown in fig. 5, the photovoltaic direct drive induction heating apparatus further comprises a fuse F and a breaker QF, wherein:
the uncontrolled rectifying circuit 31 is connected with the alternating current power grid through a three-phase power line.
In some embodiments of the present disclosure, as shown in fig. 5, the fuse F and the breaker QF are both disposed in series on the three-phase power line, wherein:
and the fuse F is used for fusing under the condition that the current on the power grid side is greater than the selected fuse fusing value when a fault occurs, so that the power supply loop (main loop) of the alternating current power grid is disconnected.
A circuit breaker QF, used as a manual switch (manual on-off knob) of the ac grid supply circuit; and automatically disconnecting the power supply loop of the alternating current power grid under the condition that the current on the power grid side is greater than the selected fuse fusing value of the fuse.
In some embodiments of the present disclosure, the photovoltaic direct drive induction heating apparatus may further comprise a charging circuit, wherein:
the charging circuit is arranged on the three-phase power line in parallel and used for reducing current and reducing the charging speed of direct-current voltage on the rectified rear side when the photovoltaic direct-drive induction heating device is started; after the rectified rear side direct current charging is completed, the charging circuit is disconnected.
In some embodiments of the present disclosure, as shown in fig. 5, KM is a contactor, R is a charging point resistor, and KM and R form a charging circuit, which plays a role of reducing current when the photovoltaic induction heating device is turned on, so as to reduce the charging speed of the rectified rear-side dc voltage, protect the dc capacitor C1, and after the rectified rear-side dc charging is completed, KM is turned off.
In some embodiments of the present disclosure, as shown in fig. 5, the uncontrolled rectifying circuit comprises a filter inductor LdAnd an uncontrolled rectifier bridge module BV.
Fig. 4 and 5 also present schematic views of some embodiments of the photovoltaic direct drive induction heating apparatus of the present disclosure. As shown in fig. 4 and 5, the photovoltaic direct drive induction heating apparatus of the present disclosure may include a photovoltaic panel 10, an alternating current grid 20, and a photovoltaic direct drive induction heating device 30, wherein:
in some embodiments of the present disclosure, the ac power grid 20 may be a grid-side 380V three-phase ac power.
In some embodiments of the present disclosure, the photovoltaic panel 10 and the ac power grid 20 are used to supply power to the photovoltaic direct-drive induction heating device 30 in a dual power supply manner.
In some embodiments of the present disclosure, the photovoltaic panel 10 is configured to separately power the photovoltaic direct drive induction heating device 30 when the photovoltaic power generation power is equal to or greater than the power consumption power of the photovoltaic direct drive induction heating device 30.
In some embodiments of the present disclosure, the photovoltaic panel 10 and the ac power grid 20 are used to jointly power the photovoltaic direct drive induction heating device 30 in the case that the photovoltaic power generation power is greater than 0 and less than the power consumption of the photovoltaic direct drive induction heating device 30.
In some embodiments of the present disclosure, the ac power grid 20 is configured to separately supply the photovoltaic direct-drive induction heating device 30 with the photovoltaic power generation power equal to 0.
In some embodiments of the present disclosure, the photovoltaic panel 10 is used for supplying power to the photovoltaic direct-drive induction heating device 30 in case of power failure or line maintenance of the ac power grid 20.
According to the photovoltaic direct-drive induction heating device, the improved scheme of the photovoltaic direct-drive induction heating device adopts a photovoltaic power generation power supply mode, and the problems that the power consumption of the power grid side of a conventional induction welding factory building is large and the electricity cost is high are solved.
According to the photovoltaic direct-drive induction heating device disclosed by the embodiment of the disclosure, according to the photovoltaic power generation characteristics, the sunlight irradiation effect is best in the period from 8 am to 4 pm, the power generation power is highest, the goodness of fit between the time period and the working time period of each production machine in a plant area is high, the power utilization peak value in the plant area can be effectively reduced, and the power utilization cost is reduced. And the high-power induction heating device is powered by adopting a photovoltaic power generation and 380V power grid dual power supply mode. When sunlight illumination is sufficient, the photovoltaic power generation power can meet the power consumption of the induction heating device, and at the moment, the photovoltaic power generation can be used for supplying power independently; when sunlight illumination is insufficient, the photovoltaic power generation power is smaller than the electricity utilization power of the induction heating device, and at the moment, 380V power grid is used for supplying power to ensure that the induction heating device runs at full power.
Direct current generated by the photovoltaic panel in the embodiment of the disclosure is not inverted into alternating current by the inverter and is input into a 380V alternating current power grid for grid connection, then power is taken from the 380V alternating current power grid, and the alternating current is rectified into direct current by a rectifying part of the induction heating device; but adopts a direct drive mode of directly supplying power to the direct current bus of the induction heating device. According to the embodiment of the disclosure, the two conversion processes that photovoltaic power generation is converted into alternating current through the inverter for grid connection and then rectified into direct current through the rectifying part of the induction heating device are omitted, the conversion loss is reduced, and the photovoltaic utilization rate is improved.
According to the embodiment of the disclosure, the photovoltaic inverter does not need to be assembled, and the construction and equipment cost of a power distribution room and a high-power photovoltaic inverter are saved. According to the embodiment of the disclosure, a dual power supply mode of 380V three-phase alternating current and photovoltaic power of the urban network is adopted, when the urban network is powered off or lines in a factory are overhauled, the photovoltaic power supply can be continuously utilized to ensure that equipment runs uninterruptedly, the line is not required to be stopped and the production is stopped, and the power supply reliability of an induction welding factory production system is improved.
Based on this open above-mentioned embodiment of photovoltaic directly drives induction heating device controlling means and equipment that provides, adopt photovoltaic directly to drive the power supply, solved the problem that conventional induction welding factory building electric wire netting side power consumption is big. According to the photovoltaic power generation characteristics of the photovoltaic direct-drive induction heating device, the sunlight irradiation effect is the best in the period from 8 am to 4 pm, the power generation power is the highest, the goodness of fit between the time period and the working time period of each production machine in the plant area is high, the power utilization peak value in the plant area can be effectively reduced, and the power utilization cost is reduced.
According to the embodiment of the disclosure, a mode that direct current generated by photovoltaic is directly supplied to the direct current bus of the induction heating device is adopted, so that two conversion processes that photovoltaic power generation is converted into alternating current through the inverter for grid connection and then rectified into direct current through the rectifying part of the induction heating device are saved, the conversion loss is reduced, and the photovoltaic utilization rate is improved. Compared with the traditional scheme, the photovoltaic inverter does not need to be assembled, and the construction and equipment cost of a power distribution room and a high-power photovoltaic inverter are saved.
According to the embodiment of the disclosure, a dual power supply mode of 380V three-phase alternating current and photovoltaic power of the urban network is adopted, when the urban network is powered off or lines in a factory are overhauled, the photovoltaic power supply can be continuously utilized to guarantee uninterrupted operation of equipment, the line is not required to be stopped, the production stop is not required, the reliability of an induction welding factory production system is improved, and the production efficiency is guaranteed.
Based on photovoltaic directly drives induction heating device controlling means and equipment that this openly above-mentioned embodiment provided, adopt photovoltaic power generation to supply power for the induction heating device of high power, realize reducing the problem that factory power grid side power consumption is big, the charges of electricity are expensive. The direct-drive mode that direct current generated by photovoltaic directly supplies power to the direct current bus of the induction heating device improves the utilization rate of photovoltaic power generation. According to the embodiment of the photovoltaic induction heating device, the BUCK voltage reduction circuit of the induction heating device is replaced by the BUCK-BOOST voltage reduction circuit, the direct-current bus voltage of the induction heating device is subjected to wide-range adjustment from reduction to increase, the maximum power generation time of the photovoltaic panel is prolonged, and the photovoltaic power generation efficiency of the photovoltaic induction heating device is maximized.
Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware to implement the above embodiments, where the program may be stored in a non-transitory computer readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic or optical disk, and the like.
The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (11)
1. The utility model provides a photovoltaic directly drives induction heating device which characterized in that, includes uncontrolled rectifier circuit, direct current-direct current converting circuit, inverter circuit and resonant load, wherein:
the uncontrolled rectifying circuit is connected with the direct current-direct current conversion circuit, the direct current-direct current conversion circuit is connected with the inverter circuit through the direct current bus, and the inverter circuit is connected with the resonant load;
the uncontrolled rectifying circuit is connected with an alternating current power grid; the alternating current power grid is used for supplying power to the resonant load through the uncontrolled rectifying circuit, the direct current-direct current conversion circuit and the inverter circuit;
the photovoltaic panel is connected with the direct current bus; and the photovoltaic panel is used for supplying power to the resonant load through the direct current bus and the inverter circuit, so that the photovoltaic directly drives the induction heating device.
2. The photovoltaic direct-drive induction heating device as claimed in claim 1, wherein the resonant load is an induction heating coil;
and the inverter circuit is used for inverting the direct current into high-frequency alternating current, and the high-frequency alternating current flows through the inside of the induction heating coil so that the induction heating coil generates an alternating electromagnetic field to heat the metal workpiece to be processed.
3. The photovoltaic direct drive induction heating device according to claim 1 or 2,
the direct current-direct current conversion circuit is used for controlling direct current voltage of the photovoltaic panel side and providing a wide photovoltaic panel direct current voltage optimizing and adjusting range.
4. The photovoltaic direct drive induction heating device according to claim 3,
the direct current-direct current conversion circuit is a buck-boost chopper circuit or a buck chopper circuit, wherein the photovoltaic panel direct current voltage optimizing adjusting range provided by the buck-boost chopper circuit is larger than the photovoltaic panel direct current voltage optimizing adjusting range provided by the buck chopper circuit.
5. The photovoltaic direct drive induction heating device according to claim 1 or 2,
the photovoltaic panel and the alternating current power grid are used for supplying power to the photovoltaic direct-drive induction heating device in a dual power supply mode.
6. The photovoltaic direct drive induction heating device according to claim 5,
the photovoltaic panel is used for independently supplying power to the photovoltaic direct-drive induction heating device under the condition that the photovoltaic power generation power is more than or equal to the power consumption power of the photovoltaic direct-drive induction heating device;
the photovoltaic panel and the alternating current power grid are used for jointly supplying power to the photovoltaic direct-drive induction heating device under the condition that the photovoltaic power generation power is greater than 0 and smaller than the power consumption of the photovoltaic direct-drive induction heating device;
and the alternating current power grid is used for independently supplying power to the photovoltaic direct-drive induction heating device under the condition that the photovoltaic power generation power is equal to 0.
7. The photovoltaic direct drive induction heating device according to claim 5,
and the photovoltaic panel is used for supplying power to the photovoltaic direct-drive induction heating device under the condition of power failure of an alternating current power grid or line maintenance.
8. The photovoltaic direct drive induction heating device according to claim 1 or 2,
the transistor of the inverter circuit is used for adjusting and controlling the output power of the photovoltaic direct-drive induction heating device under the condition that the photovoltaic panel supplies power;
the transistor of the direct current-direct current conversion circuit is used for carrying out wide adjustment on the voltage of a direct current bus to track the maximum power point of photovoltaic power generation under the condition that the photovoltaic panel supplies power;
and the transistor of the direct current-direct current conversion circuit is used for adjusting and controlling the output power of the photovoltaic direct-drive induction heating device under the condition of power supply of an alternating current power grid.
9. The photovoltaic direct drive induction heating apparatus according to claim 1 or 2, further comprising a fuse and a circuit breaker, wherein:
the uncontrolled rectifying circuit is connected with an alternating current power grid through a three-phase power line;
fuse and circuit breaker establish ties and set up on the three-phase power supply line, wherein:
the fuse is used for fusing under the condition that the current on the power grid side is larger than the selected fuse fusing value when a fault occurs, so that a power supply loop of the alternating current power grid is disconnected;
the circuit breaker is used as a manual switch of a power supply loop of an alternating current power grid; and disconnecting the power supply loop of the alternating current power grid under the condition that the current on the power grid side is greater than the selected fuse fusing value of the fuse.
10. The photovoltaic direct drive induction heating device according to claim 9, further comprising a charging circuit, wherein:
the charging circuit is arranged on the three-phase power line in parallel and used for reducing current and reducing the charging speed of direct-current voltage on the rectified rear side when the photovoltaic direct-drive induction heating device is started; after the rectified rear side direct current charging is completed, the charging circuit is disconnected.
11. A photovoltaic direct drive induction heating apparatus comprising a photovoltaic panel and a photovoltaic direct drive induction heating device as claimed in any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122693962.8U CN216216574U (en) | 2021-11-04 | 2021-11-04 | Photovoltaic direct-drive induction heating device and equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122693962.8U CN216216574U (en) | 2021-11-04 | 2021-11-04 | Photovoltaic direct-drive induction heating device and equipment |
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| CN216216574U true CN216216574U (en) | 2022-04-05 |
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