Z-source inverter circuit, circuit board, controller and air conditioner

Abstract

The utility model discloses a Z-source inverter circuit, a circuit board, a controller and an air conditioner, the Z-source inverter circuit comprises a first magnetic integrated inductor, a second magnetic integrated inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first IPM module and a second IPM module, a first magnetic integrated inductor formed by winding a first inductor winding wire and a second inductor winding wire on a first magnetic core at the same time is connected with a first capacitor and a second capacitor respectively to form a first X-type impedance network; and a second magnetic integrated inductor formed by winding a third inductor winding wire and a fourth inductor winding wire on a second magnetic core at the same time is respectively connected with a third capacitor and a fourth capacitor to form a second X-type impedance network, so that two paths of positive and negative inductors can be integrated together under the condition of ensuring the power supply efficiency of two paths of parallel loads of the Z-source inverter; the number of circuit elements is reduced, space is saved, cost is reduced, meanwhile, the influence of electromagnetic coupling between inductors is reduced, and the EMI problem of an electric control system is solved.

Description

Technical Field

[0001] The utility model relates to the field of electrical technology, in particular to a Z-source inverter circuit, a circuit board, a controller and an air conditioner. Background Art

[0002] At present, the Z-source network inverter circuit of the related art may include an X-type impedance network and an intelligent power module (IPM). The IPM module can be controlled to increase the DC link voltage output by the X-type impedance network to provide a high voltage power supply for the load, and the inductor in the X-type impedance network is an important part of its DC side network. By storing and releasing energy, it helps to achieve current smoothing and voltage conversion, which helps to improve the boosting ability and stability of the Z-source inverter. However, in the parallel Z-source inverter, due to the large number of inductors, the number of components in the overall circuit will increase, the complexity of the circuit will increase, and the system maintenance cost will increase; in addition, the inductor will generate a magnetic field when working. When multiple inductors are used in parallel, the magnetic fields generated by them will interfere with each other, affecting the stability of the system and the normal operation of other electrical equipment. Utility Model Content

[0003] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and to provide a Z-source inverter circuit, a circuit board, a controller and an air conditioner, which can reduce the number of circuit elements, save space and reduce costs. At the same time, due to the reduction in the number of inductors, the influence of electromagnetic coupling between inductors can be reduced, thereby improving the EMI problem of the electronic control system.

[0004] In a first aspect, an embodiment of the utility model provides a Z-source inverter circuit, comprising:

[0005] A first magnetic integrated inductor, comprising a first magnetic core, a first inductor winding and a second inductor winding wound on the first magnetic core at the same time;

[0006] A second magnetic integrated inductor, comprising a second magnetic core, a third inductor winding and a fourth inductor winding wound on the second magnetic core at the same time;

[0007] A first capacitor, wherein two ends of the first capacitor are respectively connected to one end of the first inductor winding and one end of the third inductor winding;

[0008] a second capacitor, wherein two ends of the second capacitor are respectively connected to the other end of the first inductor winding and the other end of the third inductor winding, so that the first inductor winding, the third inductor winding, the first capacitor and the second capacitor form a first X-type impedance network;

[0009] a third capacitor, two ends of the third capacitor being connected to one end of the second inductor winding and one end of the third inductor winding respectively;

[0010] a fourth capacitor, wherein two ends of the fourth capacitor are respectively connected to the other end of the second inductor winding and the other end of the fourth inductor winding, so that the second inductor winding, the fourth inductor winding, the third capacitor and the fourth capacitor form a second X-type impedance network; two input ends of the first X-type impedance network and two input ends of the second X-type impedance network are connected in parallel to the same power module;

[0011] A first IPM module, used to supply power to a first load, wherein the first IPM module is connected to two output ends of the first X-type impedance network;

[0012] The second IPM module is used to supply power to the second load, and the second IPM module is connected to two output ends of the second X-type impedance network.

[0013] The Z-source inverter circuit provided by the embodiment of the utility model has at least the following beneficial effects: the Z-source inverter circuit of the embodiment of the utility model connects the first capacitor and the second capacitor to form a first X-type impedance network through the first magnetic integrated inductor formed by the first inductor winding and the second inductor winding wound on the first magnetic core, and connects the third capacitor and the fourth capacitor to form a second X-type impedance network through the second magnetic integrated inductor formed by the third inductor winding and the fourth inductor winding wound on the second magnetic core. It can integrate the positive and negative inductors connected in parallel in the original circuit while ensuring the efficiency of the first IPM module and the second IPM module of the parallel Z-source inverter in supplying power to the two loads, thereby reducing the number of circuit elements, which is beneficial to saving the space of the circuit board occupied by the inductor and reducing the cost. At the same time, due to the reduction in the number of inductors, the influence of electromagnetic coupling between inductors can be reduced, thereby improving the EMI problem of the electronic control system.

[0014] According to the Z-source inverter circuit provided by some embodiments of the present invention, the first inductor winding and the second inductor winding have the same winding direction on the first magnetic core.

[0015] According to the Z-source inverter circuit provided by some embodiments of the present invention, the third inductor winding and the fourth inductor winding have the same winding direction on the second magnetic core.

[0016] According to the Z-source inverter circuit provided by some embodiments of the present invention, the first magnetic integrated inductor includes a first common winding end, a first winding end, and a second winding end, the first inductor winding is formed between the first common winding end and the first winding end, and the second inductor winding is formed between the first common winding end and the second winding end.

[0017] According to the Z-source inverter circuit provided in some embodiments of the present invention, the first common winding end is connected to the positive pole of the power module, the first winding end is connected to the positive pole of the input end of the first IPM module, and the second winding end is connected to the positive pole of the input end of the second IPM module.

[0018] According to the Z-source inverter circuit provided by some embodiments of the present invention, the second magnetic integrated inductor includes a second common winding end, a third winding end and a fourth winding end, the third inductor winding is formed between the second common winding end and the third winding end, and the fourth inductor winding is formed between the second common winding end and the fourth winding end.

[0019] According to the Z-source inverter circuit provided by some embodiments of the present invention, the second common winding end is connected to the negative pole of the power module, the third winding end is connected to the negative pole of the input end of the first IPM module, and the fourth winding end is connected to the negative pole of the input end of the second IPM module.

[0020] According to the Z-source inverter circuit provided in some embodiments of the present invention, when direct-through boosting is required, the first IPM module and the second IPM module simultaneously enter the direct-through state; the direct-through state is that the upper bridge arm switch tube and the lower bridge arm switch tube of at least one bridge arm in the IPM module are simultaneously turned on.

[0021] According to the Z-source inverter circuit provided by some embodiments of the present invention, the carrier frequency of the first PWM signal used to drive the first IPM module and the carrier frequency of the second PWM signal used to drive the second IPM module have an integer multiple relationship.

[0022] In a second aspect, an embodiment of the utility model provides a circuit board, comprising the Z-source inverter circuit as described in the embodiment of the first aspect above.

[0023] The circuit board provided by the embodiment of the utility model has at least the following beneficial effects: the Z-source inverter circuit of the embodiment of the utility model connects the first capacitor and the second capacitor to form a first X-type impedance network through the first magnetic integrated inductor formed by the first inductor winding and the second inductor winding wound on the first magnetic core, and connects the third capacitor and the fourth capacitor to form a second X-type impedance network through the second magnetic integrated inductor formed by the third inductor winding and the fourth inductor winding wound on the second magnetic core, respectively. It can integrate the two positive and negative inductors originally connected in parallel in the circuit while ensuring the efficiency of the first IPM module and the second IPM module of the parallel Z-source inverter in supplying power to the two loads, thereby reducing the number of circuit elements, which is beneficial to saving the space occupied by the inductor on the circuit board and reducing the cost. At the same time, due to the reduction in the number of inductors, the influence of electromagnetic coupling between inductors can be reduced, thereby improving the EMI problem of the electronic control system.

[0024] In a third aspect, an embodiment of the utility model provides a controller, comprising a load device and the circuit board as described in the embodiment of the second aspect above.

[0025] According to the controller provided by the embodiment of the utility model, at least the following beneficial effects are achieved: the Z-source inverter circuit of the embodiment of the utility model connects the first capacitor and the second capacitor to form a first X-type impedance network through the first magnetic integrated inductor formed by the first inductor winding and the second inductor winding being wound on the first magnetic core, and connects the third capacitor and the fourth capacitor to form a second X-type impedance network through the second magnetic integrated inductor formed by the third inductor winding and the fourth inductor winding being wound on the second magnetic core, respectively. It can integrate the two positive and negative inductors originally connected in parallel in the circuit while ensuring the efficiency of the first IPM module and the second IPM module of the parallel Z-source inverter in supplying power to the two loads, thereby reducing the number of circuit elements, which is beneficial to saving the space of the circuit board occupied by the inductor and reducing the cost. At the same time, due to the reduction in the number of inductors, the influence of electromagnetic coupling between the inductors can be reduced, thereby improving the EMI problem of the electronic control system.

[0026] In a fourth aspect, an embodiment of the utility model provides an air conditioner, comprising the circuit board as described in the embodiment of the second aspect or the controller as described in the embodiment of the third aspect.

[0027] The air conditioner provided according to the embodiment of the utility model has at least the following beneficial effects: the Z-source inverter circuit of the utility model embodiment has a first magnetic integrated inductor formed by winding the first inductor winding and the second inductor winding on the first magnetic core, which is respectively connected to the first capacitor and the second capacitor to form a first X-type impedance network, and a second magnetic integrated inductor formed by winding the third inductor winding and the fourth inductor winding on the second magnetic core, which is respectively connected to the third capacitor and the fourth capacitor to form a second X-type impedance network. Under the condition of ensuring the efficiency of the first IPM module and the second IPM module of the parallel Z-source inverter to supply power to the two loads, the two positive and negative inductors originally connected in parallel in the circuit can be integrated together, thereby reducing the number of circuit elements, which is beneficial to saving the space of the circuit board occupied by the inductor and reducing the cost. At the same time, due to the reduction in the number of inductors, the influence of electromagnetic coupling between inductors can be reduced, thereby improving the EMI problem of the electronic control system.

[0028] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0030] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0031] Figure 1 It is a circuit schematic diagram of a Z-source inverter circuit provided by an embodiment of the utility model;

[0032] Figure 2 It is a schematic diagram of the structure of the first magnetic integrated inductor and the second magnetic integrated inductor provided in an embodiment of the utility model;

[0033] Figure 3 It is a schematic diagram of three-phase waveforms of synchronous direct connection of the first IPM module and the second IPM module provided by an embodiment of the utility model;

[0034] Figure 4 It is a schematic diagram of three-phase waveforms of synchronous direct connection of the first IPM module and the second IPM module provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0035] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0036] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "any one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of the first and the second, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] It should be noted that the words such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense, and the technical personnel in the relevant technical field can reasonably determine the specific meanings of the above words in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0038] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] At present, the Z-source network inverter circuit of the related technology may include an X-type impedance network and an intelligent power module (IPM). The IPM module can be controlled to increase the DC link voltage output by the X-type impedance network to provide a high-voltage power supply for the load, and the inductor in the X-type impedance network is an important part of its DC side network. By storing and releasing energy, it helps to achieve current smoothing and voltage conversion, which helps to improve the boosting ability and stability of the Z-source inverter. However, in the parallel Z-source inverter, due to the large number of inductors, the number of components in the overall circuit will increase, the complexity of the circuit will increase, and the system maintenance cost will increase; in addition, the inductor will generate a magnetic field when working. When multiple inductors are used in parallel, the magnetic fields generated by them will interfere with each other, affecting the stability of the system and the normal operation of other electrical equipment.

[0040] Based on this, the embodiments of the utility model provide a Z-source inverter circuit, circuit board, controller and air conditioner, which can reduce the number of circuit elements, save space and reduce costs. At the same time, due to the reduction in the number of inductors, the influence of electromagnetic coupling between inductors can be reduced, thereby improving the EMI problem of the electronic control system.

[0041] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0042] Figure 1 It is a circuit schematic diagram of a Z-source inverter circuit provided by an embodiment of the utility model; Figure 2 1 is a schematic diagram of the structure of the first magnetic integrated inductor 100 and the second magnetic integrated inductor 200 provided in an embodiment of the present utility model. Figure 1 and Figure 2 The first aspect of the present invention provides a Z-source inverter circuit, comprising:

[0043] The first magnetic integrated inductor 100 includes a first magnetic core 110, a first inductor winding 120 and a second inductor winding 130 wound on the first magnetic core 110 at the same time; the second magnetic integrated inductor 200 includes a second magnetic core 210, a third inductor winding 220 and a fourth inductor winding 230 wound on the second magnetic core 210 at the same time; it can be understood that the first magnetic integrated inductor 100 and the second magnetic integrated inductor 200 are both wound by two groups of windings on the same magnetic core, wherein the two groups of windings wound on the first magnetic core 110 are the first inductor winding 120 and the second inductor winding 130, respectively, and the two groups of windings wound on the second magnetic core 210 are the third inductor winding 220 and the fourth inductor winding 230, respectively, which not only participate in the storage and release of electric energy, but also help to achieve voltage rise and fall. In the embodiment of the utility model, by integrating the inductance of the Z-source inverter circuit, the number of components can be reduced, the complexity of the electric control system can be reduced, and the overall performance of the electric control system can be improved.

[0044] A first capacitor C1, two ends of the first capacitor C1 are respectively connected to one end of the first inductor winding 120 and one end of the third inductor winding 220; a second capacitor C2, two ends of the second capacitor C2 are respectively connected to the other end of the first inductor winding 120 and the other end of the third inductor winding 220, so that the first inductor winding 120, the third inductor winding 220, the first capacitor C1 and the second capacitor C2 form a first X-type impedance network 300; a third capacitor C3, two ends of the third capacitor C3 are respectively connected to one end of the second inductor winding 130 and one end of the third inductor winding 220; a fourth capacitor C4, two ends of the fourth capacitor C4 are respectively connected to the other end of the second inductor winding 130 and the fourth inductor winding 220; The other end of the inductor winding 230 is connected to the second inductor winding 130, the fourth inductor winding 230, the third capacitor C3 and the fourth capacitor C4 to form a second X-type impedance network 400; the two input ends of the first X-type impedance network 300 and the two input ends of the second X-type impedance network 400 are connected in parallel to the same power module 700; it can be understood that the first X-type impedance network 300 and the second X-type impedance network 400 allow the power module 700 to charge the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4, thereby storing energy, wherein the power module 700 can be a device that outputs DC power, such as a DC power supply, an AC power supply plus a rectifier, and a DC battery.

[0045] The first IPM module 500 is used to supply power to the first load, and the first IPM module 500 is connected to the two output ends of the first X-type impedance network 300; the second IPM module 600 is used to supply power to the second load, and the second IPM module 600 is connected to the two output ends of the second X-type impedance network 400. It can be understood that the first IPM module 500 and the second IPM module 600 can be composed of a single IGBT or MOSFET tube, and the control of the bus voltage by the Z-source inverter can be achieved by controlling the bridge arms of the first IPM module 500 and the second IPM module 600 to enter the through state and the non-through state.

[0046] It should be noted that the Z-source inverter circuit provided in the embodiment of the utility model is an electronic control circuit in an air conditioner. The first load and the second load are usually three-phase motors. For example, the first load can be a compressor or a fan motor, and the second load can be a compressor or a fan motor. Specifically, in the embodiment of the utility model, the first load is a compressor, and the second load is a fan motor.

[0047] According to the Z-source inverter circuit provided by the embodiment of the utility model, the first magnetic integrated inductor 100 formed by the first inductor winding 120 and the second inductor winding 130 being simultaneously wound on the first magnetic core 110 is respectively connected to the first capacitor C1 and the second capacitor C2 to form a first X-type impedance network 300, and the second magnetic integrated inductor 200 formed by the third inductor winding 220 and the fourth inductor winding 230 being simultaneously wound on the second magnetic core 210 is respectively connected to the third capacitor C3 and the fourth capacitor C4 to form a second X-type impedance network 400. Under the condition of ensuring the efficiency of the first IPM module 500 and the second IPM module 600 of the parallel Z-source inverter supplying power to the two loads, the two positive and negative inductors originally connected in parallel in the circuit can be integrated together, thereby reducing the number of circuit elements, which is beneficial to saving the space of the circuit board occupied by the inductor and reducing the cost. At the same time, due to the reduction in the number of inductors, the influence of electromagnetic coupling between the inductors can be reduced, thereby improving the EMI problem of the electric control system.

[0048] Reference Figure 1 In the Z-source inverter circuit provided in some embodiments of the present invention, a control module is also included, which is connected to the first IPM module 500 and the second IPM module 600 respectively; specifically, the control module can be a single-chip microcomputer, which can generate appropriate pulse width modulation (PWM) or other types of control signals, and transmit them to the drive circuit of the IPM module through a connecting line, so as to control the switching state of the switch tube in the IPM module according to these control signals, thereby controlling the flow direction and size of the current. It should be noted that in the embodiment of the present invention, the control signal generated by the control module is a space vector pulse width modulation (SVPWM) signal.

[0049] Reference Figure 2 In the Z-source inverter circuit provided in some embodiments of the present invention, the first inductor winding 120 and the second inductor winding 130 have the same winding direction on the first magnetic core 110. It can be understood that the first magnetic core 110 has two groups of windings, namely the first inductor winding 120 and the second inductor winding 130, wherein the first inductor winding 120 and the second inductor winding 130 have the same winding direction on the first magnetic core 110, and then when the current I1 flowing through the first inductor winding 120 and the current I2 flowing through the second inductor winding 130 have the same direction, the magnetic flux generated in the first magnetic core 110 can have the same direction, thereby generating superimposed magnetic flux, which can not only improve the inductive coupling efficiency of the Z-source inverter network, but also reduce the amount of magnetic core used, thereby reducing costs. In this embodiment, the number of turns of the first inductor winding 120 and the second inductor winding 130 is the same.

[0050] It is understandable that the first magnetic core 110 is a circular ring structure, or the first magnetic core 110 is not limited to a circular ring structure, but can also be other polygonal ring structures. In the embodiment of the utility model, the first magnetic core 110 can be made of magnetic materials such as amorphous ribbon, nanocrystalline ribbon, ferrite, etc.

[0051] Reference Figure 2 In the Z-source inverter circuit provided in some embodiments of the present invention, the third inductor winding 220 and the fourth inductor winding 230 have the same winding direction on the second magnetic core 210. It can be understood that the second magnetic core 210 has two groups of windings, namely the third inductor winding 220 and the fourth inductor winding 230, wherein the third inductor winding 220 and the fourth inductor winding 230 have the same winding direction on the second magnetic core 210, and then when the current I3 flowing through the third inductor winding 220 and the current I4 flowing through the fourth inductor winding 230 have the same direction, the magnetic flux generated in the second magnetic core 210 can have the same direction, thereby generating superimposed magnetic flux, which can not only improve the inductive coupling efficiency of the Z-source inverter network, but also reduce the amount of magnetic core, thereby reducing costs. In this embodiment, the third inductor winding 220 and the fourth inductor winding 230 have the same number of turns.

[0052] It is understandable that the second magnetic core 210 is a circular ring structure, or the second magnetic core 210 is not limited to a circular ring structure, but can also be other polygonal ring structures. In the embodiment of the utility model, the second magnetic core 210 can be made of magnetic materials such as amorphous ribbon, nanocrystalline ribbon, ferrite, etc.

[0053] Reference Figure 2 In the Z-source inverter circuit provided in some embodiments of the present utility model, the first magnetic integrated inductor 100 includes a first common winding end a, a first winding end a1, and a second winding end a11, the first inductor winding 120 is formed between the first common winding end a and the first winding end a1, and the second inductor winding 130 is formed between the first common winding end a and the second winding end a11. It can be understood that the first inductor winding 120 is wound on the first magnetic core 110 and connected to the second inductor winding 130 wound on the first magnetic core 110 through the first common winding end a, wherein the other end of the first inductor winding 120 is the first winding end a1, and the other end of the second inductor winding 130 is the second winding end a11, thereby forming the first magnetic integrated inductor 100, which can effectively reduce the number of inductors, thereby playing the effect of reducing system cost, volume and loss.

[0054] Reference Figure 1In the Z-source inverter circuit provided in some embodiments of the present invention, the first common winding terminal a is connected to the positive pole of the power module 700, the first winding terminal a1 is connected to the positive pole of the input terminal of the first IPM module 500, and the second winding terminal a11 is connected to the positive pole of the input terminal of the second IPM module 600. It can be understood that the connection point between the positive pole of the input end of the first X-type impedance network 300 and the positive pole of the input end of the second X-type impedance network 400 is the first common winding end a, the first X-type impedance network 300 and the second X-type impedance network 400 are connected to the positive pole of the power module 700 through the first common winding end a, the first winding end a1 is connected to the positive pole of the input end of the first IPM module 500 as an output end of the first X-type impedance network 300, and the second winding end a11 is connected to the positive pole of the input end of the second IPM module 600 as an output end of the second X-type impedance network 400. The bus voltage is controlled by controlling the bridge arms of the first IPM module 500 and the second IPM module 600 to enter the direct-through state and the non-direct-through state.

[0055] In this embodiment, the first winding end a1 is the positive output terminal of the first X-type impedance network 300 , and the second winding end a11 is the positive output terminal of the second X-type impedance network 400 .

[0056] Reference Figure 2 In the Z-source inverter circuit provided in some embodiments of the present invention, the second magnetic integrated inductor 200 includes a second common winding terminal b, a third winding terminal b1 and a fourth winding terminal b11, the third inductor winding 220 is formed between the second common winding terminal b and the third winding terminal b1, and the fourth inductor winding 230 is formed between the second common winding terminal and the fourth winding terminal b11. It can be understood that the third inductor winding 220 is wound on the second magnetic core 210 and connected to the fourth inductor winding 230 wound on the second magnetic core 210 through the second common winding terminal b, wherein the other end of the third inductor winding 220 is the third winding terminal b1, and the other end of the fourth inductor winding 230 is the fourth winding terminal b11, thereby forming the first magnetic integrated inductor 100, which can effectively reduce the number of inductors, thereby playing the effect of reducing system cost, volume and loss.

[0057] Reference Figure 1In the Z source inverter circuit provided in some embodiments of the present invention, the second common winding terminal b is connected to the negative pole of the power module 700, the third winding terminal b1 is connected to the negative pole of the input terminal of the first IPM module 500, and the fourth winding terminal b11 is connected to the negative pole of the input terminal of the second IPM module 600. It can be understood that the connection point between the negative pole of the input end of the first X-type impedance network 300 and the negative pole of the input end of the second X-type impedance network 400 is the second common winding terminal b, the first X-type impedance network 300 and the second X-type impedance network 400 are connected to the negative pole of the power module 700 through the second common winding terminal b, the third winding terminal b1 is connected to the negative pole of the input end of the first IPM module 500 as an output end of the first X-type impedance network 300, and the fourth winding terminal b11 is connected to the negative pole of the input end of the second IPM module 600 as an output end of the second X-type impedance network 400. The bus voltage is controlled by controlling the bridge arms of the first IPM module 500 and the second IPM module 600 to enter the direct-through state and the non-direct-through state.

[0058] In this embodiment, the third winding end b1 is the negative output terminal of the first X-type impedance network 300 , and the fourth winding end b11 is the negative output terminal of the second X-type impedance network 400 .

[0059] In the Z-source inverter circuit provided in some embodiments of the present invention, when a direct boost is required, the first IPM module 500 and the second IPM module 600 enter the direct state at the same time; the direct state is that the upper bridge arm switch tube and the lower bridge arm switch tube of at least one bridge arm in the IPM module are turned on at the same time. It can be understood that the Z-source inverter circuit of the embodiment of the present invention uses the direct zero vector generated by the control module to charge and discharge the inductor to achieve the purpose of boosting. Therefore, the control module generates two SVPWM modulation control signals and inputs them into the first IPM module 500 and the second IPM module 600 respectively, so that the first IPM module 500 and the second IPM module 600 enter the direct state at the same time. In some embodiments of the present invention, the control module can adjust the control signals of the first IPM module 500 and the second IPM module 600 to be synchronized with the direct-flow time when performing SVPWM modulation. Specifically, the state switching points of the two control signals can be adjusted to align so as to achieve state switching at the same time, and their duty cycle and phase can be further adjusted so that the high-level periods within the cycles of the two control signals, i.e., the direct-flow periods, correspond to each other, thereby achieving the same current direction of the first magnetic integrated inductor 100 and the second magnetic integrated inductor 200.

[0060] Reference Figure 3 and Figure 4In the Z-source inverter circuit provided in some embodiments of the present invention, the carrier frequency of the first PWM signal used to drive the first IPM module 500 and the carrier frequency of the second PWM signal used to drive the second IPM module 600 have an integer multiple relationship. It can be understood that by adjusting the carrier frequency of the first PWM signal generated by the control module to be an integer multiple of the carrier frequency of the second PWM signal, or the carrier frequency of the generated second PWM signal to be an integer multiple of the carrier frequency of the first PWM signal, it is ensured that the through zero vector of the Z-source inverter circuit is synchronously through within the cycle, so that the current directions of each group of inductor windings constituting the first magnetic integrated inductor 100 and the second magnetic integrated inductor 200 are the same, thereby realizing the boost function.

[0061] In the embodiment of the utility model, for example, the carrier frequency of the first PWM signal is f1, the carrier frequency of the second PWM signal is f2, and there is an integer multiple relationship between the carrier frequency f1 of the first PWM signal and the carrier frequency f2 of the second PWM signal, that is:

[0062] f1=n×f2

[0063] Wherein, n is a positive integer, and n can be 1, 2, 3, etc., indicating that the carrier frequency f2 of the second PWM signal is n times the carrier frequency f1 of the first PWM signal.

[0064] In another embodiment, it may also be:

[0065] f2=m×f1

[0066] Wherein, m is another positive integer, and m can be 1, 2, 3, etc., indicating that the carrier frequency f1 of the first PWM signal is m times the carrier frequency f2 of the second PWM signal.

[0067] It should be noted that if Figure 3 As shown, when n=1, the carrier frequency f1 of the first PWM signal is the same as the carrier frequency f2 of the second PWM signal. At this time, in each PWM cycle, the number of times the first IPM module 500 and the second IPM module 600 are synchronously connected is 6 times. Figure 4 As shown, when m=2, the carrier frequency f1 of the first PWM signal is twice the carrier frequency f2 of the second PWM signal. At this time, in each PWM cycle, the first IPM module 500 is synchronized and connected 6 times, and the second IPM module 600 is synchronized and connected 3 times.

[0068] In addition, an embodiment of the utility model further provides a circuit board, comprising the Z-source inverter circuit as described in the above embodiment, wherein the Z-source inverter circuit comprises a first magnetic integrated inductor 100 formed by winding a first inductor winding 120 and a second inductor winding 130 simultaneously on a first magnetic core 110, respectively connected to a first capacitor C1 and a second capacitor C2 to form a first X-type impedance network 300, and a second magnetic integrated inductor 200 formed by winding a third inductor winding 220 and a fourth inductor winding 230 simultaneously on a second magnetic core 210, respectively connected to a third capacitor C3 and a fourth capacitor C4 to form a second X-type impedance network 400, which can integrate the two positive and negative inductors originally connected in parallel in the circuit while ensuring the efficiency of the first IPM module 500 and the second IPM module 600 of the parallel Z-source inverter in supplying power to the two loads, thereby reducing the number of circuit elements, which is beneficial to saving the space of the circuit board occupied by the inductor and reducing the cost, and at the same time, due to the reduction in the number of inductors, the influence of electromagnetic coupling between the inductors can be reduced, thereby improving the EMI problem of the electric control system.

[0069] In addition, an embodiment of the utility model further provides a controller, including a load device and a circuit board as described in the above embodiment, wherein the Z-source inverter circuit is formed by winding the first inductor winding 120 and the second inductor winding 130 simultaneously on the first magnetic core 110 to form a first magnetic integrated inductor 100 connected to the first capacitor C1 and the second capacitor C2 to form a first X-type impedance network 300, and the second magnetic integrated inductor 200 formed by winding the third inductor winding 220 and the fourth inductor winding 230 simultaneously on the second magnetic core 210 is connected to the third capacitor C3 and the fourth capacitor C4 to form a second X-type impedance network 400, which can ensure the efficiency of the first IPM module 500 and the second IPM module 600 of the parallel Z-source inverter to supply power to the two loads, and integrate the two positive and negative inductors originally connected in parallel in the circuit together, thereby reducing the number of circuit elements, which is beneficial to saving the space of the circuit board occupied by the inductor and reducing the cost, and at the same time, due to the reduction in the number of inductors, the influence of electromagnetic coupling between the inductors can be reduced, thereby improving the EMI problem of the electric control system.

[0070] In addition, an embodiment of the utility model further provides an air conditioner, comprising a circuit board as described in the above embodiment or a controller as described in the above embodiment, a first magnetic integrated inductor 100 formed by a first inductor winding 120 and a second inductor winding 130 being simultaneously wound on a first magnetic core 110 is respectively connected to a first capacitor C1 and a second capacitor C2 to form a first X-type impedance network 300, and a second magnetic integrated inductor 200 formed by a third inductor winding 220 and a fourth inductor winding 230 being simultaneously wound on a second magnetic core 210 is respectively connected to a third capacitor C3 and a fourth capacitor C4 to form a second X-type impedance network 400, which can realize the integration of the two positive and negative inductors originally connected in parallel in the circuit while ensuring the efficiency of the first IPM module 500 and the second IPM module 600 of the parallel Z-source inverter in supplying power to the two loads, thereby reducing the number of circuit elements, which is beneficial to saving the space of the circuit board occupied by the inductor and reducing the cost, and at the same time, due to the reduction in the number of inductors, the influence of electromagnetic coupling between the inductors can be reduced, thereby improving the EMI problem of the electric control system.

[0071] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A Z-source inverter circuit, characterized in that: include: A first magnetic integrated inductor, comprising a first magnetic core, a first inductor winding and a second inductor winding wound on the first magnetic core at the same time; A second magnetic integrated inductor, comprising a second magnetic core, a third inductor winding and a fourth inductor winding wound on the second magnetic core at the same time; A first capacitor, wherein two ends of the first capacitor are respectively connected to one end of the first inductor winding and one end of the third inductor winding; a second capacitor, wherein two ends of the second capacitor are respectively connected to the other end of the first inductor winding and the other end of the third inductor winding, so that the first inductor winding, the third inductor winding, the first capacitor and the second capacitor form a first X-type impedance network; a third capacitor, two ends of the third capacitor being connected to one end of the second inductor winding and one end of the third inductor winding respectively; a fourth capacitor, wherein two ends of the fourth capacitor are respectively connected to the other end of the second inductor winding and the other end of the fourth inductor winding, so that the second inductor winding, the fourth inductor winding, the third capacitor and the fourth capacitor form a second X-type impedance network; two input ends of the first X-type impedance network and two input ends of the second X-type impedance network are connected in parallel to the same power module; A first IPM module, used to supply power to a first load, wherein the first IPM module is connected to two output ends of the first X-type impedance network; The second IPM module is used to supply power to the second load, and the second IPM module is connected to two output ends of the second X-type impedance network.

2. The Z-source inverter circuit according to claim 1, characterized in that: The first inductor winding and the second inductor winding are wound in the same direction on the first magnetic core.

3. The Z-source inverter circuit according to claim 1, characterized in that: The third inductor winding and the fourth inductor winding have the same winding direction on the second magnetic core.

4. The Z-source inverter circuit according to claim 2, characterized in that: The first magnetic integrated inductor includes a first common winding end, a first winding end, and a second winding end. The first inductor winding is formed between the first common winding end and the first winding end, and the second inductor winding is formed between the first common winding end and the second winding end.

5. The Z-source inverter circuit according to claim 4, characterized in that: The first common winding end is connected to the positive electrode of the power module, the first winding end is connected to the positive electrode of the input end of the first IPM module, and the second winding end is connected to the positive electrode of the input end of the second IPM module.

6. The Z-source inverter circuit according to claim 3, characterized in that: The second magnetic integrated inductor includes a second common winding end, a third winding end and a fourth winding end. The third inductor winding is formed between the second common winding end and the third winding end. The fourth inductor winding is formed between the second common winding end and the fourth winding end.

7. The Z-source inverter circuit according to claim 6, characterized in that: The second common winding terminal is connected to the negative electrode of the power module, the third winding terminal is connected to the negative electrode of the input terminal of the first IPM module, and the fourth winding terminal is connected to the negative electrode of the input terminal of the second IPM module.

8. The Z-source inverter circuit according to claim 1, characterized in that: When through-boosting is required, the first IPM module and the second IPM module enter the through-state at the same time; the through-state is that the upper bridge arm switch tube and the lower bridge arm switch tube of at least one bridge arm in the IPM module are turned on at the same time.

9. The Z-source inverter circuit according to claim 8, characterized in that: A carrier frequency of a first PWM signal for driving the first IPM module and a carrier frequency of a second PWM signal for driving the second IPM module have an integer multiple relationship.

10. A circuit board, characterized in that: The Z-source inverter circuit comprises the Z-source inverter circuit as claimed in any one of claims 1 to 9.

11. A controller, characterized in that: Including the circuit board described in claim 10.

12. An air conditioner, characterized in that: Includes the circuit board according to claim 10 or the controller according to claim 11.

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