CN214674939U - Inverter circuit and inverter - Google Patents
Inverter circuit and inverter Download PDFInfo
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- CN214674939U CN214674939U CN202120474954.1U CN202120474954U CN214674939U CN 214674939 U CN214674939 U CN 214674939U CN 202120474954 U CN202120474954 U CN 202120474954U CN 214674939 U CN214674939 U CN 214674939U
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Abstract
The embodiment of the utility model discloses inverter circuit and dc-to-ac converter, inverter circuit includes two at least single-phase contravariant modules, at least three switch module, electric potential regulation and control module, at least three switch module includes first switch module, second switch module and third switch module, first single-phase contravariant module is connected with electric potential regulation and control module, first single-phase contravariant module is connected with first switch module, the single-phase contravariant module of second is connected with second switch module, first switch module respectively with second switch module, third switch module and electric potential regulation and control module are connected, the third switch module still is used for being connected with the load, control module is used for exporting the first switch module of control signal control, the second switch module, third switch module and electric potential regulation and control module, for different loads provide corresponding operating voltage. Through the mode, different output modes can be set according to different use requirements, so that the diversified use requirements of a user can be met.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to an inverter circuit and dc-to-ac converter.
Background
The high intensity consumption and the continuous rising price of the traditional fossil energy have become problems in energy crisis and environmental pollution in all countries of the world. The development and utilization of new energy are highly concerned by countries in the world, low-carbon economy is developed, energy conservation and emission reduction are advocated, and the method is a necessary choice for realizing sustainable development.
Photovoltaic power generation is one of the renewable energy industries which are developed most rapidly and have the best prospect at present. The device has the characteristics of safety, reliability, few moving parts, low noise, convenience in maintenance, long service life, no fuel consumption and high flexibility. The off-grid and grid-connected photovoltaic power generation energy storage system is small in size, convenient to carry, convenient to use and maintain, tends to enter thousands of households, and has profound significance for solving the power supply load of residents, reducing air pollution and realizing human sustainable development.
However, the traditional off-grid and grid-connected photovoltaic power generation and energy storage system is single in design and use mode, for example, a single-phase photovoltaic power generation and energy storage system can only be used for on-load single-phase load equipment, a two-phase photovoltaic power generation and energy storage system can only be used for on-load two-phase load equipment, a three-phase photovoltaic power generation and energy storage system can only be used for on-load three-phase load equipment, the design cannot meet the diversified use requirements of users, and the popularization and application of the photovoltaic power generation and energy storage system are limited to a great extent.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an aim at providing an inverter circuit and dc-to-ac converter, can set up different output mode according to the user demand of difference to satisfy the demand of the diversified use of user.
To achieve the above object, in a first aspect, the present invention provides an inverter circuit, including:
the system comprises at least two single-phase inversion modules, at least three switch modules, a potential regulation and control module and a control module;
the first input end and the second input end of the single-phase inversion module are respectively connected with the anode and the cathode of an input power supply, and the single-phase inversion module is used for outputting a single-phase alternating-current voltage based on the input power supply;
the at least two single-phase inversion modules comprise a first single-phase inversion module and a second single-phase inversion module, and the at least three switch modules comprise a first switch module, a second switch module and a third switch module;
the first input end and the second input end of the first single-phase inversion module are further connected with the first end and the second end of the potential regulation and control module respectively, the output end of the first single-phase inversion module is connected with the first end of the first switch module, the output end of the second single-phase inversion module is connected with the first end of the second switch module, the second end of the first switch module is connected with the second end of the second switch module, the first end of the third switch module and the third end of the potential regulation and control module respectively, and the second end of the third switch module is used for being connected with a load;
the control module is respectively connected with the first switch module, the second switch module, the third switch module and the potential regulation and control module, and the control module is used for outputting control signals to control the first switch module, the second switch module, the third switch module and the potential regulation and control module so as to provide corresponding working voltages for different loads.
In an alternative mode, the output end of the first single-phase inversion module comprises three sub-output ends;
the first switch module comprises a first electromagnetic low-voltage apparatus, and the first electromagnetic low-voltage apparatus comprises a coil and at least three normally open contacts;
the two ends of a coil of the first electromagnetic low-voltage apparatus are respectively connected with the first power supply and the control module, three sub-output ends of the first single-phase inversion module are respectively connected with first ends of any three normally-open contacts of at least three normally-open contacts of the first electromagnetic low-voltage apparatus, second ends of the any three normally-open contacts are respectively connected with second ends of the second switch module and first ends of the third switch module, and a second end of one normally-open contact of the any three normally-open contacts is connected with a third end of the potential regulation and control module.
In an alternative mode, the output end of the second single-phase inversion module comprises three sub-output ends;
the second switch module comprises a second electromagnetic low-voltage apparatus, and the second electromagnetic low-voltage apparatus comprises a coil and at least three normally open contacts;
the two ends of a coil of the second electromagnetic type low-voltage apparatus are respectively connected with the first power supply and the control module, three sub-output ends of the second single-phase inversion module are respectively connected with first ends of any three normally open contacts of at least three normally open contacts of the second electromagnetic type low-voltage apparatus, second ends of the any three normally open contacts are connected with a second end of the first switch module, and a second end of one of the any three normally open contacts is connected with a third end of the potential regulation and control module.
In an alternative manner, the third switch module includes a third electromagnetic low-voltage apparatus, and the third electromagnetic low-voltage apparatus includes a coil and at least three normally open contacts;
the two ends of a coil of the third electromagnetic type low-voltage apparatus are respectively connected with the first power supply and the control module, the first ends of any three normally open contacts of at least three normally open contacts of the third electromagnetic type low-voltage apparatus are connected with the second end of the first switch module, and the second ends of the any three normally open contacts are connected with the load.
In an alternative, the at least three switch modules further comprise a fourth switch module;
the at least two single-phase inversion modules further comprise a third single-phase inversion module;
the output end of the third single-phase inversion module is connected with the first end of the fourth switch module, and the second end of the fourth switch module is connected with the second end of the first switch module.
In an alternative mode, the output end of the third single-phase inversion module comprises three sub-output ends;
the fourth switch module comprises a fourth electromagnetic low-voltage apparatus, and the fourth electromagnetic low-voltage apparatus comprises a coil and at least three normally open contacts;
the two ends of a coil of the fourth electromagnetic low-voltage apparatus are respectively connected with the first power supply and the control module, three sub-output ends of the third single-phase inversion module are respectively connected with first ends of any three normally open contacts of at least three normally open contacts of the fourth electromagnetic low-voltage apparatus, second ends of the any three normally open contacts are connected with a second end of the first switch module, and a second end of one of the any three normally open contacts is connected with a third end of the potential regulation and control module.
In an optional manner, the potential regulation and control module includes a first capacitor and a second capacitor connected in series, a potential regulation and control unit, and a first switch unit;
the non-series connection point of the first capacitor is connected with the anode of the input power supply, the non-series connection point of the second capacitor is connected with the cathode of the input power supply, the connection point between the first capacitor and the second capacitor is connected with the first end of the potential regulating and controlling unit, the second end of the potential regulating and controlling unit is connected with the first end of the first switch unit, and the second end of the first switch unit is connected with the second end of the first switch module;
the non-series connection point of the first capacitor is a first end of the potential regulation module, the non-series connection point of the second capacitor is a second end of the potential regulation module, and the second end of the first switch unit is a third end of the potential regulation module.
In an alternative mode, the first switch unit comprises a fifth electromagnetic low-voltage apparatus, and the fifth electromagnetic low-voltage apparatus comprises a coil and at least one normally open contact;
two ends of a coil of the fifth electromagnetic low-voltage apparatus are respectively connected with the first power supply and the control module, and two ends of any one normally open contact of the at least one normally open contact are respectively connected with the potential regulating and controlling unit and the second end of the first switch module.
In an optional mode, the inverter circuit further comprises a grid voltage sampling module;
the power grid voltage sampling module is respectively connected with the second end of the third switch module and the second power supply;
the power grid voltage sampling module is used for collecting two-phase power grid voltage signals.
In a second aspect, the present invention further provides an inverter, which includes the inverter circuit described above.
The embodiment of the utility model provides a beneficial effect is: the utility model provides an inverter circuit, which comprises at least two single-phase inversion modules, at least three switch modules, a potential regulation and control module, wherein a first input end and a second input end of each single-phase inversion module are respectively connected with a positive pole and a negative pole of an input power supply, the single-phase inversion modules are used for outputting single-phase alternating voltage based on the input power supply, the at least two single-phase inversion modules comprise a first single-phase inversion module and a second single-phase inversion module, the at least three switch modules comprise a first switch module, a second switch module and a third switch module, the first input end and the second input end of the first single-phase inversion module are respectively connected with a first end and a second end of the potential regulation and control module, an output end of the first single-phase inversion module is connected with a first end of the first switch module, and an output end of the second single-phase inversion module is connected with a first end of the second switch module, the second end of the first switch module is respectively connected with the second end of the second switch module, the first end of the third switch module and the third end of the potential regulation and control module, the second end of the third switch module is used for being connected with a load, the control module is respectively connected with the first switch module, the second switch module, the third switch module and the potential regulation and control module, the control module is used for outputting a control signal to control the first switch module, the second switch module, the third switch module and the potential regulation and control module so as to provide corresponding working voltages for different loads, and in the mode, different output modes can be set according to different use requirements, so that the diversified use requirements of a user are met.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of an inverter circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a single-phase inverter module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an inverter circuit according to another embodiment of the present invention;
fig. 4 is a schematic circuit diagram of an inverter circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an inverter circuit according to an embodiment of the present invention. As shown in fig. 1, the inverter circuit includes at least two single-phase inverter modules 10, at least three switch modules 20, a potential regulation module 30, and a control module 40. The at least two single-phase inversion modules 10 include a first single-phase inversion module 11 and a second single-phase inversion module 12, and the at least upper switch module 20 includes a first switch module 21, a second switch module 22, and a third switch module 23.
The first input end and the second input end of each single-phase inversion module 10 are respectively connected with the positive pole and the negative pole of the input power supply 50, that is, the first input end and the second input end of the first single-phase inversion module 11 are respectively connected with the positive pole and the negative pole of the input power supply 50, and simultaneously, the first input end and the second input end of the second single-phase inversion module 12 are respectively connected with the positive pole and the negative pole of the input power supply 50. The first input end and the second input end of the first single-phase inversion module 11 are further connected to the first end and the second end of the potential regulation module 30, respectively, and the output end of the first single-phase inversion module 11 is connected to the first end of the first switch module 21. The output end of the second single-phase inverter module 12 is connected to the first end of the second switch module 22, the second end of the first switch module 21 is connected to the second end of the second switch module 22, the first end of the third switch module 23, and the third end of the potential regulation module 30, respectively, and the second end of the third switch module 23 is used for being connected to the load 60. The control module 40 is respectively connected to the first switch module 21, the second switch module 22, the third switch module 23, and the potential regulation and control module 30, that is, any one of the switch modules 20 is connected to the control module 40.
It should be understood that any one of the single-phase inverter modules 10 may be connected to the first and second terminals of the potential regulating module 30. For example, the first single-phase inverter module 11 in the embodiment of the present application may also be, of course, the second single-phase inverter module 12, which is not limited herein.
Specifically, the single-phase inverter module 10 is configured to output a single-phase ac voltage, which may be an operating voltage of the load 60, based on the input power source 50. The control module 40 is configured to output a control signal to control the first switch module 21, the second switch module 22, the third switch module 23, and the potential regulation and control module 30, so as to provide corresponding operating voltages for different loads. For example, when the control module 40 outputs a control signal to control the switching states of the first switching module 21 and the third switching module 23 to be the on state, the first single-phase inverter module 11 converts the input power into a single-phase ac voltage, and transmits the single-phase ac voltage to the load 60 through the first switching module 21 and the third switching module 23, where the load is a single-phase load device. Therefore, a single-phase inversion output mode is realized, and the requirement of supplying power for single-phase load equipment is met.
In an embodiment, any one of the at least two single-phase inversion modules 10 may have a circuit structure as shown in fig. 2. As shown in fig. 2, the single-phase inverter module includes an energy storage unit 111, an inverter unit 112, a filtering unit 113, and a sampling unit 114.
The IN1 end and the INT2 end of the energy storage unit 111 are respectively a first input end and a second input end of the single-phase inverter module, that is, the INT1 end is connected to the positive electrode of the input power supply, and the INT2 end is connected to the negative electrode of the input power supply. The input end of the inverter unit 112 is connected to the energy storage unit 111, and the inverter unit 112 is configured to convert a dc input power into an ac voltage. The filtering unit 113 is connected to the inverting unit 112, and the filtering unit 113 is configured to filter the ac voltage output by the inverting unit. The input end of the sampling unit 114 is connected to the output end of the filtering unit 113, and the sampling unit 114 is configured to collect a voltage value and a current value of the filtered ac voltage.
It is understood that the single-phase inverter module may have other circuit configurations, and is not limited herein. For example, the inverter unit 112 may have a full-bridge circuit structure as shown in fig. 2, and in other embodiments, may also have a half-bridge circuit structure.
In other embodiments, as shown in fig. 3, the at least two single-phase inversion modules further include a third single-phase inversion module 13, and the at least three switch modules 20 further include a fourth switch module 24. The output end of the third single-phase inverter module 13 is connected to the first end of the fourth switch module 24, the second end of the fourth switch module 24 is connected to the second end of the first switch module 21, that is, the second end of the fourth switch module 24 is further connected to the second end of the second switch module 22 and the first end of the third switch module. The fourth switch module 24 is also connected to the control unit 40.
Optionally, referring to fig. 4 in combination with fig. 3, as shown in fig. 4, the output end of the first single-phase inverter module 11 includes three sub-output ends, the first switch module 21 includes a first electromagnetic low-voltage device, and the first electromagnetic low-voltage device includes a coil and at least three normally open contacts.
First ends of any three normally open contacts of at least three normally open contacts of the first electromagnetic low-voltage apparatus are respectively a 1 st pin, a 2 nd pin and a 3 rd pin of the first switch module 21, and second ends of the three normally open contacts are respectively a 11 th pin, a 9 th pin and a 7 th pin of the first switch module 21. Three sub-output ends of the first single-phase inverter module 11 are respectively connected with the 1 st pin, the 2 nd pin and the 3 rd pin of the first switch module 21. The 11 th pin, the 9 th pin, and the 7 th pin of the first switch module 21 are connected to the second end of the second switch module 22, the second end of the fourth switch module 24, and the first end of the third switch module 23, and the 9 th pin of the first switch module 21 is further connected to the third end of the potential regulation module 30. Two ends of the coil of the first electromagnetic low-voltage apparatus are respectively connected to the first power supply V1 and the control module 40, that is, the 4 th pin and the 5 th pin of the first switch module 21 are respectively two ends of the coil of the first electromagnetic low-voltage apparatus.
It is understood that in the embodiment shown in fig. 4, the control signal S1 outputted by the control module 40 passes through the relay control module U1 to control the coil of the first electromagnetic low-voltage device. In other embodiments, the first electromagnetic low-voltage apparatus may be directly controlled by the control signal output by the control module 40. The first electromagnetic low-voltage apparatus may be a relay or a contactor.
Optionally, the output of the second single-phase inverter module 12 includes three sub-outputs, the second switch module 22 includes a second electromagnetic low-voltage apparatus, and the second electromagnetic low-voltage apparatus includes a coil and at least three normally-open contacts.
First ends of any three normally open contacts of at least three normally open contacts of the second electromagnetic low-voltage apparatus are respectively a 1 st pin, a 2 nd pin and a 3 rd pin of the second switch module 22, and second ends of the three normally open contacts are respectively a 11 th pin, a 9 th pin and a 7 th pin of the second switch module 22. Three sub-output ends of the second single-phase inverter module 12 are respectively connected to the 1 st pin, the 2 nd pin and the 3 rd pin of the second switch module 22. The 11 th pin, the 9 th pin, and the 7 th pin of the second switch module 22 are connected to the second end of the first switch module 21, the second end of the fourth switch module 24, and the first end of the third switch module 23, and the 9 th pin of the second switch module 22 is further connected to the third end of the potential regulation module 30. Two ends of the coil of the second electromagnetic low-voltage apparatus are respectively connected to the first power supply V1 and the control module 40, that is, the 4 th pin and the 5 th pin of the second switch module 22 are respectively two ends of the coil of the second electromagnetic low-voltage apparatus.
It is understood that the specific application method of the second electromagnetic low-voltage apparatus is similar to that of the first electromagnetic low-voltage apparatus, which is within the scope easily understood by those skilled in the art, and the detailed description is omitted here.
Optionally, the third switch module 23 comprises a third electromagnetic low-voltage apparatus, and the third electromagnetic low-voltage apparatus comprises a coil and at least three normally open contacts.
First ends of any three normally open contacts of at least three normally open contacts of the third electromagnetic low-voltage apparatus are a 1 st pin, a 2 nd pin and a 3 rd pin of the third switch module 23, and second ends of the three normally open contacts are a 11 th pin, a 9 th pin and a 7 th pin of the second switch module 22. The 1 st pin, the 2 nd pin, and the 3 rd pin of the third switch module 23 are respectively connected to the second end of the first switch module 21, that is, the 1 st pin, the 2 nd pin, and the 3 rd pin of the third switch module 23 are respectively connected to the 11 th pin, the 9 th pin, and the 7 th pin of the first switch module 21. And the 11 th pin, the 9 th pin and the 7 th pin of the third switching module 23 are respectively connected to the load as the live line L, the neutral line N and the ground EGND. Two ends of the coil of the third electromagnetic low-voltage apparatus are respectively connected with the first power supply V1 and the control module 40, that is, the 4 th pin and the 5 th pin of the third switch module 23 are respectively two ends of the coil of the third electromagnetic low-voltage apparatus.
It is understood that the specific application method of the third electromagnetic low-voltage apparatus is similar to that of the first electromagnetic low-voltage apparatus, which is within the scope easily understood by those skilled in the art, and the detailed description is omitted here.
Optionally, the output of the third single-phase inverter module 13 includes three sub-outputs, the fourth switch module 24 includes a fourth electromagnetic low-voltage apparatus, and the second electromagnetic low-voltage apparatus includes a coil and at least three normally-open contacts.
The first ends of any three normally open contacts of at least three normally open contacts of the fourth electromagnetic low-voltage apparatus are respectively the 1 st pin, the 2 nd pin and the 3 rd pin of the fourth switch module 24, and the second ends of the three normally open contacts are respectively the 11 th pin, the 9 th pin and the 7 th pin of the fourth switch module 22. Three sub-output ends of the third single-phase inverter module 13 are respectively connected with the 1 st pin, the 2 nd pin and the 3 rd pin of the fourth switch module 24. The 11 th pin, the 9 th pin, and the 7 th pin of the fourth switch module 24 are connected to the second end of the first switch module 21, the second end of the second switch module 22, and the first end of the third switch module 23, and the 9 th pin of the fourth switch module 24 is further connected to the third end of the potential regulation module 30. Two ends of the coil of the fourth electromagnetic low-voltage apparatus are respectively connected to the first power supply V1 and the control module 40, that is, the 4 th pin and the 5 th pin of the fourth switch module 24 are respectively two ends of the coil of the fourth electromagnetic low-voltage apparatus.
It is understood that the specific application method of the fourth electromagnetic low-voltage apparatus is similar to that of the first electromagnetic low-voltage apparatus, which is within the scope easily understood by those skilled in the art, and the detailed description is omitted here.
Optionally, the potential regulation module 30 includes a first capacitor CX1 and a second capacitor CX2 connected in series, a potential regulation unit U5, and a first switch unit U6. The non-series connection point of the first capacitor CX1 is connected to the positive electrode of the input power supply 50, the non-series connection point of the second capacitor CX2 is connected to the negative electrode of the input power supply 50, the connection point between the first capacitor CX1 and the second capacitor CX2 is connected to the first end of the potential regulation and control unit U5, the second end of the potential regulation and control unit U5 is connected to the first end of the first switch unit U6, the second end of the first switch unit U6 is connected to the second end of the first switch module 21, that is, the second end of the first switch unit U6 is connected to the 9 th pin of the first switch module 21, the 9 th pin of the second switch module 22, the 9 th pin of the fourth switch module 24, and the 2 nd pin of the third switch module respectively. It can be seen that the non-series connection point of the first capacitor CX1 is the first end of the voltage regulation module 30, the non-series connection point of the second capacitor CX2 is the second end of the voltage regulation module 30, and the second end of the first switch unit U6 is the third end of the voltage regulation module 30.
In one embodiment, the first switch unit U6 includes a fifth electromagnetic low-voltage device, and the fifth electromagnetic low-voltage device includes a coil and at least one normally-open contact.
Specifically, two ends of a coil of the fifth electromagnetic low-voltage apparatus are respectively connected to the first power supply V1 and the control module 40, and two ends of any one of the at least one normally-open contact are respectively connected to the potential regulating unit U5 and the second end of the first switch module 21. That is, two ends of a normally open contact of the fifth electromagnetic low-voltage apparatus correspond to the 1 st pin and the 4 th pin of the first switch unit U6, respectively, and two ends of a coil of the fifth electromagnetic low-voltage apparatus correspond to the 2 nd pin and the 3 rd pin of the first switch unit U6, respectively. The 1 st pin of the first switch unit U6 is connected to the potential adjustment and control unit U5, the 4 th pin of the first switch unit U6 is connected to the 9 th pin of the first switch module 21, the 2 nd pin of the first switch unit U6 is connected to the first power supply V1, and the 3 rd pin of the first switch unit U6 is connected to the control module 40.
It is understood that the specific application method of the fifth electromagnetic low-voltage apparatus is similar to that of the first electromagnetic low-voltage apparatus, and it is within the scope easily understood by those skilled in the art, and the detailed description thereof is omitted here.
Optionally, the inverter circuit further includes a grid voltage sampling module U7, wherein the grid voltage sampling module U7 is connected to the second end of the third switching module 23 and the second power source V2, respectively, and the grid voltage sampling module U7 is configured to collect a two-phase grid voltage signal.
It should be noted that the first power source V1 and the second power source V2 may be power sources of the inverter circuit, or may be external independent power sources, and the voltage value of the first power source V1 may be the same as or different from the voltage value of the second power source V2, which is not limited herein.
In practical applications, taking the example shown in fig. 4 with three single-phase inverter modules and four switch modules, the circuit structure can implement the following output modes:
the first is a single-phase inverter output mode in which the load to which the inverter circuit is connected is a single-phase load device. At this time, only one of the single-phase inverter modules is needed to provide the working voltage for the load, and the first single-phase inverter module 11 is taken as an example for explanation. First, the control module 40 controls the first switch module 21 and the third switch module 23 to be closed, that is, controls the coil of the first electromagnetic low-voltage device and the coil of the third electromagnetic low-voltage device to be powered on, and controls the other switch modules to be disconnected, that is, the coils of the other electromagnetic low-voltage devices are powered off, so that the input power source 50 is connected to the load through the first single-phase inverter module 11, the first switch module 21, and the third switch module 23. Then, the control module 40 uses a closed-loop feedback control strategy to control the inverter unit in the first single-phase inverter module 11 to realize a full-bridge inverter function to obtain an inverter voltage according to the voltage signal and the current signal sampled in real time by the sampling unit in the first single-phase inverter module 11 as feedback control signals, and the inverter voltage is filtered by the filtering unit in the first single-phase inverter module 11 to obtain a high-quality single-phase alternating current output voltage. The single-phase ac output voltage can be used as a supply voltage for a single-phase load device.
If other single-phase inverter modules are selected to provide the working voltage for the load, the corresponding switch modules only need to be operated similarly to the above process, and other operations within the range easily understood by those skilled in the art are not described herein again.
The second is a single-phase parallel operation output mode, in which the load connected to the inverter circuit is a load device with a large power. First, the control module 40 controls the first switch module 21, the second switch module 22, the third switch module 23 and the fourth switch module 24 to be closed, and the first switch unit U6 to be opened, at this time, the first single-phase inverter module 11, the second single-phase inverter module 12 and the third single-phase inverter module 13 are connected in parallel to output to turn on the load. Then, the control module 40 uses the voltage signal and the current signal sampled in real time by each sampling unit in the first single-phase inversion module 11, the second single-phase inversion module 12 and the third single-phase inversion module 13 as the feedback control signal to realize the simultaneous and sequential independent closed-loop feedback control of the first single-phase inversion module 11, the second single-phase inversion module 12 and the third single-phase inversion module 13, and further obtain the inversion output voltage and current with the same phase and the same secondary value. Finally, the control module 40 controls the first switch unit U6 to be closed, and the potential regulating unit U5 is connected to the circuit, so as to balance the current among the three modules, i.e., the first single-phase inverter module 11, the second single-phase inverter module 12, and the third single-phase inverter module 13.
The third is a single-phase grid-connected output mode, and in the single-phase grid-connected output mode, the inverter circuit needs to realize single-phase grid connection to feed power to a power grid. Similarly, at this time, only one of the single-phase inverter modules is needed to implement single-phase grid-connected power feeding, and the first single-phase inverter module 11 is taken as an example for description. First, the control module 40 controls all the switch modules and the switch units to be turned off. Then, the inverter circuit is connected to a power grid, and the control module 40 samples a power grid voltage signal in real time through the power grid voltage sampling module U7, and obtains the frequency, the secondary value and the phase of the power grid voltage after calculation processing. Then, the control module 40 uses the frequency, the secondary value and the phase of the grid voltage as the target value regulating value, and controls the first single-phase inverter module 11 to perform single-phase inverter output, so that the frequency, the secondary value and the phase of the output inverter voltage are completely the same as the grid voltage. Finally, the control module 40 controls the first switch module 21 and the third switch module 23 to close, so as to implement the single-phase grid-connected feeding function.
The fourth is a two-phase inverter output mode in which the inverter circuit needs to be implemented to provide operating voltage for the two-phase load device. At this time, only any two single-phase inversion modules are needed to implement single-phase grid-connected feeding, and the first single-phase inversion module 11 and the second single-phase inversion module 12 are taken as an example for explanation. First, the control module 40 controls the first switch module 21 and the second switch module 22 to be closed, that is, controls the coil of the first electromagnetic low-voltage device and the coil of the second electromagnetic low-voltage device to be powered, and simultaneously controls the third switch module 23, the fourth switch module 24 and the first switch unit U6 to be disconnected. Then, the control module 40 uses the voltage and current signals sampled by the sampling units in the first single-phase inverter module 11 and the second single-phase inverter module 12 as feedback signals to realize the closed-loop feedback control of the first single-phase inverter module 11 and the second single-phase inverter module 12, and adopts the time sequence control with the phase interval of 180 degrees on the PWM driving control time sequence of the inverter units in the first single-phase inverter module 11 and the second single-phase inverter module 12 to obtain the inverter voltage and current with the same secondary value and the phase difference of 180 degrees. Finally, the control module 40 controls the third switching module 23 to close to implement two-phase inversion output.
The fifth is a two-phase grid-connected output mode, in which the inverter circuit needs to realize two-phase grid-connected power feeding to the grid. At this time, only any two single-phase inversion modules are needed to implement single-phase grid-connected feeding, and the first single-phase inversion module 11 and the second single-phase inversion module 12 are taken as an example for explanation. First, the control module 40 controls the first switch module 21 and the second switch module 22 to be closed, that is, controls the coil of the first electromagnetic low-voltage device and the coil of the second electromagnetic low-voltage device to be powered, and simultaneously controls the third switch module 23, the fourth switch module 24 and the first switch unit U6 to be disconnected. Then, the inverter circuit is connected to the power grid, and the control module 40 receives the two-phase power grid voltage signal sampled by the power grid voltage sampling circuit module U7, and obtains the frequency, the secondary value, and the phase of the two-phase power grid voltage after calculation processing. Finally, the control module 40 takes the frequency, the secondary value and the phase of the two-phase grid voltage as the regulation target value, controls the first switch module 21 and the second switch module 22 to perform two-phase inversion output, and when the frequency, the secondary value and the phase of the output inversion voltage are completely the same as those of the two grids, closes the third switch module 23 to control the closing of the third switch module, so as to realize the two-phase grid-connected feeding function.
The sixth is a three-phase inverter output mode in which the inverter circuit needs to be implemented to provide operating voltage for the three-phase load device. First, the control module 40 controls the first, second and third switch modules 21, 22 and 23 to be closed, and controls the fourth switch module 24 to be disconnected from the first switch unit U6. Then, the control module 40 uses the voltage and current signals sampled by the sampling units of the first single-phase inversion module 11, the second single-phase inversion module 12 and the third single-phase inversion module 13 as feedback signals to realize closed-loop feedback control of three groups of single-phase inversion modules, namely the first single-phase inversion module 11, the second single-phase inversion module 12 and the third single-phase inversion module 13, and controls the PWM driving control time sequence of the inversion units of the first single-phase inversion module 11, the second single-phase inversion module 12 and the third single-phase inversion module 13 by adopting a time sequence with 120-degree phase intervals, so as to obtain inversion voltages and currents with equal secondary values and 120-degree phase differences. Then, the control module 40 controls the first switch unit U6 to close, and the potential regulating unit U5 is connected to the circuit to correct the neutral point potential. Finally, the control module 40 controls the third switching module 23 to close to start the three-phase inversion output.
The seventh is a three-phase grid-connected output mode in which the inverter circuit needs to be implemented to provide operating voltage for the three-phase load device. First, the control module 40 controls the first, second and third switch modules 21, 22 and 23 to be closed, and controls the fourth switch module 24 to be disconnected from the first switch unit U6. Then, the inverter circuit is connected to a power grid, and the control module 40 receives the two-phase power grid voltage signal sampled by the power grid voltage sampling module U7, and obtains the frequency, the secondary value and the phase of the three-power grid voltage after calculation processing. Then, the control module 40 takes the frequency, the secondary value, and the phase of the three-phase grid voltage as the control target values, controls the three groups of single-phase inverter circuit modules, namely the first single-phase inverter module 11, the second single-phase inverter module 12, and the third single-phase inverter module 13, to realize phase inversion output, and makes the output inverter voltage and current frequency, the secondary value, and the phase completely the same as those of the three grids. Then, the control module 40 controls the first switch unit U6 to close, and the potential regulating unit U5 is connected into the circuit to correct the neutral point potential. Finally, the control module 40 controls the third switching module 23 to close, so as to implement the three-phase grid-connected feeding function.
In summary, when the inverter circuit has three single-phase inverter modules and four switch modules, the circuit structure can realize at least seven output modes. Meanwhile, the inverter circuit can realize corresponding output modes along with the change of the number of the single-phase inverter modules and the number of the switch modules. Therefore, different output modes can be set according to different use requirements, and the requirement of diversified use of a user is met.
It is understood that, in the above embodiments, when the control module 40 controls the switch units or the switch modules to be closed, the control module 40 controls the coils in the corresponding switch units or switch modules to be powered on, whereas when the control module 40 controls the switch units or switch modules to be switched off, the control module 40 controls the coils in the corresponding switch units or switch modules to be powered off.
The present application also provides an inverter including an inverter circuit as in any of the above embodiments.
The utility model provides an inverter circuit, which comprises at least two single-phase inversion modules, at least three switch modules, a potential regulation and control module, wherein a first input end and a second input end of each single-phase inversion module are respectively connected with a positive pole and a negative pole of an input power supply, the single-phase inversion modules are used for outputting single-phase alternating voltage based on the input power supply, the at least two single-phase inversion modules comprise a first single-phase inversion module and a second single-phase inversion module, the at least three switch modules comprise a first switch module, a second switch module and a third switch module, the first input end and the second input end of the first single-phase inversion module are respectively connected with a first end and a second end of the potential regulation and control module, an output end of the first single-phase inversion module is connected with a first end of the first switch module, and an output end of the second single-phase inversion module is connected with a first end of the second switch module, the second end of the first switch module is respectively connected with the second end of the second switch module, the first end of the third switch module and the third end of the potential regulation and control module, the second end of the third switch module is used for being connected with a load, the control module is respectively connected with the first switch module, the second switch module, the third switch module and the potential regulation and control module, the control module is used for outputting a control signal to control the first switch module, the second switch module, the third switch module and the potential regulation and control module so as to provide corresponding working voltages for different loads, and in the mode, different output modes can be set according to different use requirements, so that the diversified use requirements of a user are met.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An inverter circuit, comprising:
the system comprises at least two single-phase inversion modules, at least three switch modules, a potential regulation and control module and a control module;
the first input end and the second input end of the single-phase inversion module are respectively connected with the anode and the cathode of an input power supply, and the single-phase inversion module is used for outputting a single-phase alternating-current voltage based on the input power supply;
the at least two single-phase inversion modules comprise a first single-phase inversion module and a second single-phase inversion module, and the at least three switch modules comprise a first switch module, a second switch module and a third switch module;
the first input end and the second input end of the first single-phase inversion module are further connected with the first end and the second end of the potential regulation and control module respectively, the output end of the first single-phase inversion module is connected with the first end of the first switch module, the output end of the second single-phase inversion module is connected with the first end of the second switch module, the second end of the first switch module is connected with the second end of the second switch module, the first end of the third switch module and the third end of the potential regulation and control module respectively, and the second end of the third switch module is used for being connected with a load;
the control module is respectively connected with the first switch module, the second switch module, the third switch module and the potential regulation and control module, and the control module is used for outputting control signals to control the first switch module, the second switch module, the third switch module and the potential regulation and control module so as to provide corresponding working voltages for different loads.
2. The inverter circuit according to claim 1,
the output end of the first single-phase inversion module comprises three sub-output ends;
the first switch module comprises a first electromagnetic low-voltage apparatus, and the first electromagnetic low-voltage apparatus comprises a coil and at least three normally open contacts;
the two ends of a coil of the first electromagnetic low-voltage apparatus are respectively connected with the first power supply and the control module, three sub-output ends of the first single-phase inversion module are respectively connected with first ends of any three normally-open contacts of at least three normally-open contacts of the first electromagnetic low-voltage apparatus, second ends of the any three normally-open contacts are respectively connected with second ends of the second switch module and first ends of the third switch module, and a second end of one normally-open contact of the any three normally-open contacts is connected with a third end of the potential regulation and control module.
3. The inverter circuit according to claim 1,
the output end of the second single-phase inversion module comprises three sub-output ends;
the second switch module comprises a second electromagnetic low-voltage apparatus, and the second electromagnetic low-voltage apparatus comprises a coil and at least three normally open contacts;
the two ends of a coil of the second electromagnetic type low-voltage apparatus are respectively connected with the first power supply and the control module, three sub-output ends of the second single-phase inversion module are respectively connected with first ends of any three normally open contacts of at least three normally open contacts of the second electromagnetic type low-voltage apparatus, second ends of the any three normally open contacts are connected with a second end of the first switch module, and a second end of one of the any three normally open contacts is connected with a third end of the potential regulation and control module.
4. The inverter circuit according to claim 1,
the third switch module comprises a third electromagnetic low-voltage apparatus, and the third electromagnetic low-voltage apparatus comprises a coil and at least three normally open contacts;
the two ends of a coil of the third electromagnetic type low-voltage apparatus are respectively connected with the first power supply and the control module, the first ends of any three normally open contacts of at least three normally open contacts of the third electromagnetic type low-voltage apparatus are connected with the second end of the first switch module, and the second ends of the any three normally open contacts are connected with the load.
5. The inverter circuit according to any one of claims 1 to 4,
the at least three switch modules further comprise a fourth switch module;
the at least two single-phase inversion modules further comprise a third single-phase inversion module;
the output end of the third single-phase inversion module is connected with the first end of the fourth switch module, and the second end of the fourth switch module is connected with the second end of the first switch module.
6. The inverter circuit according to claim 5,
the output end of the third single-phase inversion module comprises three sub-output ends;
the fourth switch module comprises a fourth electromagnetic low-voltage apparatus, and the fourth electromagnetic low-voltage apparatus comprises a coil and at least three normally open contacts;
the two ends of a coil of the fourth electromagnetic low-voltage apparatus are respectively connected with the first power supply and the control module, three sub-output ends of the third single-phase inversion module are respectively connected with first ends of any three normally open contacts of at least three normally open contacts of the fourth electromagnetic low-voltage apparatus, second ends of the any three normally open contacts are connected with a second end of the first switch module, and a second end of one of the any three normally open contacts is connected with a third end of the potential regulation and control module.
7. The inverter circuit according to claim 1,
the potential regulation and control module comprises a first capacitor, a second capacitor, a potential regulation and control unit and a first switch unit which are connected in series;
the non-series connection point of the first capacitor is connected with the anode of the input power supply, the non-series connection point of the second capacitor is connected with the cathode of the input power supply, the connection point between the first capacitor and the second capacitor is connected with the first end of the potential regulating and controlling unit, the second end of the potential regulating and controlling unit is connected with the first end of the first switch unit, and the second end of the first switch unit is connected with the second end of the first switch module;
the non-series connection point of the first capacitor is a first end of the potential regulation module, the non-series connection point of the second capacitor is a second end of the potential regulation module, and the second end of the first switch unit is a third end of the potential regulation module.
8. The inverter circuit according to claim 7,
the first switch unit comprises a fifth electromagnetic low-voltage apparatus, and the fifth electromagnetic low-voltage apparatus comprises a coil and at least one normally open contact;
two ends of a coil of the fifth electromagnetic low-voltage apparatus are respectively connected with the first power supply and the control module, and two ends of any one normally open contact of the at least one normally open contact are respectively connected with the potential regulating and controlling unit and the second end of the first switch module.
9. The inverter circuit according to claim 1,
the inverter circuit further comprises a power grid voltage sampling module;
the power grid voltage sampling module is respectively connected with the second end of the third switch module and the second power supply;
the power grid voltage sampling module is used for collecting two-phase power grid voltage signals.
10. An inverter, characterized in that the inverter comprises an inverter circuit according to any one of claims 1 to 9.
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| CN202120474954.1U CN214674939U (en) | 2021-03-04 | 2021-03-04 | Inverter circuit and inverter |
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