Phase sequence recognition device, converter and photovoltaic air storage conditioner

Abstract

The invention relates to a phase sequence recognition device, a converter and a photovoltaic air storage conditioner, pulse signals with different duty ratios can be output through different phase line ports, and when a first phase switch, a second phase switch and a third phase switch in a switch assembly are all closed, the pulse signals can be converted into pulse signals with different duty ratios. Therefore, the first phase display lamp, the second phase display lamp and the third phase display lamp can display different brightness. If the phase sequence of the pulse signal line assembly is correct, that is, a first phase pulse signal line is connected with a first phase line port, a second phase pulse signal line is connected with a second phase line port, and a third phase pulse signal line is connected with a third phase line port, the brightness displayed by a first phase display lamp, a second phase display lamp and a third phase display lamp is enabled to be uniform. And the duty ratios of the pulse signals are consistent with those of the corresponding output pulse signals. And if the phase sequence of the pulse signal line assembly is wrong, the display brightness of the at least two display lamps is inconsistent with the duty ratio of the pulse signal output by the corresponding phase.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a phase sequence identification device, a converter and a photovoltaic storage air conditioner. Background Art

[0002] Photovoltaic energy storage air conditioning is a green energy system that uses solar energy to drive the operation of air conditioning. Through the power generation of photovoltaic panels and the regulation of the energy storage system, it can achieve energy self-sufficiency and efficient utilization. It has the advantages of energy saving and emission reduction, economy and practicality, and a wide range of applicable scenarios.

[0003] In photovoltaic storage air conditioners, the three-phase PWM (Pulse Width Modulation) pulse signal line between the inverter's main control board and the rectifier and inverter drive boards is used to transmit the pulse signals that control the inverter to perform rectification and inversion functions. If the wiring does not match the preset phase sequence of the program, the pulse signal received by the driver board will be incorrect, causing abnormal rectification and inversion processes, and even inverter failure and component damage. Summary of the Invention

[0004] Based on this, it is necessary to provide a phase sequence identification device, converter and photovoltaic storage air conditioner to address the problem that the three-phase PWM pulse signal line is easily wired incorrectly, resulting in abnormal rectification and inversion process of the converter, and even converter failure and component damage.

[0005] The present application provides a phase sequence identification device, comprising: a control component, a pulse signal line component, a switch component and a display component, wherein the pulse signal line component comprises a first-phase pulse signal line, a second-phase pulse signal line and a third-phase pulse signal line, and the first-phase pulse signal line, the second-phase pulse signal line and the third-phase pulse signal line are respectively connected to a phase line port of the control component; wherein the duty cycles of the pulse signals output by different phase line ports are inconsistent; the switch component comprises a first-phase switch, a second-phase switch and a third-phase switch; the display component comprises a first-phase display light, a second-phase display light and a third-phase display light, the first-phase pulse signal line is connected to the first-phase display light through the first-phase switch, the second-phase pulse signal line is connected to the second-phase display light through the second-phase switch, and the third-phase pulse signal line is connected to the third-phase display light through the third-phase switch.

[0006] The above-mentioned phase sequence identification device, the control component includes multiple phase line ports, each phase line port is connected to a pulse signal line, that is, the first phase pulse signal line, the second phase pulse signal line and the third phase pulse signal line are respectively connected to a phase line port of the control component. Pulse signals with different duty cycles can be output through different phase line ports. When the first phase switch, the second phase switch and the third phase switch in the switch component are all closed, the first phase display light, the second phase display light and the third phase display light can display different brightness. If the phase sequence of the pulse signal line component is correct, that is, the first phase pulse signal line is connected to the first phase line port, the second phase pulse signal line is connected to the second phase line port, and the third phase pulse signal line is connected to the third phase line port, then the brightness displayed by the first phase display light, the second phase display light and the third phase display light will be consistent with the duty cycle of the pulse signal outputted by each corresponding phase. If the phase sequence of the pulse signal line component is wrong, the display brightness of at least two display lights will be inconsistent with the duty cycle of the pulse signal outputted by their corresponding phases. The above scheme can realize phase sequence detection by judging whether the brightness of each phase display light in the display component is consistent with the duty cycle of the corresponding output pulse signal, thereby solving the problem that the three-phase PWM pulse signal line is easily wired incorrectly, resulting in abnormal rectification and inversion process of the converter, and even converter failure and component damage.

[0007] In one embodiment, the first phase switch, the second phase switch, and the third phase switch are all controllable switches, and the first phase switch, the second phase switch, and the third phase switch are respectively connected to the control component.

[0008] The above solution uses a controllable switch to build a switch component, so that the start and stop of the phase sequence identification device can be controlled by the control component, thereby improving the degree of automation of the operation of the phase sequence identification device.

[0009] In one embodiment, the switch component is a selection switch component, the input end of the selection switch component is connected to the pulse signal line component, the first output end of the selection switch component is connected to the display component, and the second output end of the selection switch component is used to connect to the module drive circuit of the inverter.

[0010] The above solution configures a selection switch component between the pulse signal line component and the display component, which can not only be selected to realize phase sequence detection, but also be selected to transmit the pulse signal to the module drive circuit to realize the operation drive of the inverter, and has high operation reliability.

[0011] In one embodiment, the control component is used to control the selection switch component to enable the connection between the pulse signal line component and the display component when the inverter is in a standby state.

[0012] The above solution enables the phase sequence detection operation to be performed when the converter is in the standby state, thereby saving the time cost of the converter phase sequence detection.

[0013] In one embodiment, the phase sequence identification device also includes a brightness identification component connected to the control component, and the brightness identification component is used to obtain the brightness of the first phase display light, the second phase display light and the third phase display light, and send the brightness identification result to the control component; the control component is also used to determine whether the wiring sequence of the pulse signal line component and the control component is correct based on the brightness identification result.

[0014] The above solution can automatically complete the entire phase sequence detection operation by configuring a brightness recognition component to perform brightness recognition, which has the advantage of high detection efficiency and higher detection accuracy than manual detection.

[0015] In one embodiment, the display component further includes a light-shielding box, and the first phase display light, the second phase display light, and the third phase display light are respectively arranged inside one of the light-shielding boxes, and one brightness identification component is correspondingly arranged inside one of the light-shielding boxes.

[0016] The above solution isolates the display lamps of each phase through the light shielding box, thereby avoiding brightness interference between display lamps of different phases during brightness detection and effectively improving the accuracy of brightness detection.

[0017] In one embodiment, the display assembly further includes a light-guiding column connecting the interior and exterior of the light-shielding box.

[0018] In the above solution, a light-guiding column is also provided on the light-shielding box, which can connect the inside and outside of the light-shielding box, so as to lead out the light displayed by each phase display light for user observation, thereby verifying the phase sequence identification result and effectively improving the operational reliability of the phase sequence identification device.

[0019] In one embodiment, the brightness recognition component includes a connected brightness detector and a pre-processing circuit, and the pre-processing circuit is connected to the control component.

[0020] The above solution uses a brightness detector and a preprocessing circuit to build a brightness recognition component. The detection result of the brightness detector can be preprocessed and then sent to the control component for recognition processing, which has high brightness detection reliability.

[0021] In one embodiment, the pre-processing circuit includes a filter circuit and an analog-to-digital conversion circuit connected to each other, the filter circuit is connected to the brightness detector, and the analog-to-digital conversion circuit is connected to the control component.

[0022] The above solution uses a filtering circuit and an analog-to-digital conversion circuit to form a preprocessing circuit. While reliably preprocessing the detection results, it can also effectively save the hardware cost and volume of the brightness recognition component.

[0023] The present application also provides a converter, comprising a module drive circuit, a converter circuit and the above-mentioned phase sequence identification device, wherein the module drive circuit is connected to the switch component and the converter circuit.

[0024] The present application also provides a photovoltaic storage air conditioner, including the above-mentioned converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a structural diagram of a phase sequence identification device in one embodiment of the present application;

[0027] Figure 2 This is a structural diagram of a phase sequence identification device in another embodiment of the present application;

[0028] Figure 3 This is a schematic diagram showing the structure of components in one embodiment of the present application;

[0029] Figure 4 This is a schematic diagram of the structure of a brightness recognition component in one embodiment of the present application;

[0030] Figure 5 This is a schematic structural diagram of a brightness recognition component in another embodiment of the present application;

[0031] Figure 6 This is a schematic diagram of the converter structure in one embodiment of the present application.

[0032] Description of reference numerals:

[0033] 10-control component, 20-pulse signal line component, 30-switch component, 40-display component, 50-brightness identification component; 21-first phase pulse signal line, 22-second phase pulse signal line, 23-third phase pulse signal line; K1-first phase switch, K2-second phase switch, K3-third phase switch; D1-first phase display light, D2-second phase display light, D3-third phase display light; 51-brightness detector, 52-preprocessing circuit, 521-filtering circuit, 522-analog-to-digital conversion circuit; 61-rectifier circuit, 62-inverter circuit, C-capacitor. DETAILED DESCRIPTION

[0034] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0035] The phase sequence identification device provided in the embodiments of the present application is applicable to various devices or components that need to output PWM pulse signals through a pulse signal line for driving, without specific limitation. For example, in one embodiment, the phase sequence identification device can be applied to a converter, and in another embodiment, it can also be applied to a rectifier or inverter, without specific limitation. To facilitate understanding of the technical solution of the present application, the following embodiments are explained by applying the phase sequence identification device to a converter.

[0036] See also Figure 1 The present application provides a phase sequence identification device, including: a control component 10, a pulse signal line component 20, a switch component 30 and a display component 40, the pulse signal line component 20 includes a first phase pulse signal line 21, a second phase pulse signal line 22 and a third phase pulse signal line 23, the first phase pulse signal line 21, the second phase pulse signal line 22 and the third phase pulse signal line 23 are respectively connected to a phase line port of the control component 10; wherein, the duty cycles of the pulse signals output by different phase line ports are inconsistent; the switch component 30 includes a first phase switch K1, a second phase switch K2 and a third phase switch K3; the display component 40 includes a first phase display light D1, a second phase display light D2 and a third phase display light D3, the first phase pulse signal line 21 is connected to the first phase display light D1 through the first phase switch K1, the second phase pulse signal line 22 is connected to the second phase display light D2 through the second phase switch K2, and the third phase pulse signal line 23 is connected to the third phase display light D3 through the third phase switch K3.

[0037] Specifically, the pulse signal line is a signal line used to transmit a pulse signal (specifically a PWM signal), and the display light is a device that can display different brightness according to the duty cycle of the received pulse signal. Its type is not unique and can be an LED (Light Emitting Diode) and the like, and is not specifically limited. In actual scenarios, devices such as converters can control the on and off of internal switching devices through three-phase independent pulse signals to achieve a current conversion function. In order to facilitate understanding of the technical solution of the present application, the following embodiments can all understand phase A of the three phases as the first phase, phase B as the second phase, and phase C as the third phase. Accordingly, the first-phase pulse signal line 21 is used to transmit the A-phase pulse signal, the second-phase pulse signal line 22 is used to transmit the B-phase pulse signal, and the third-phase pulse signal line 23 is used to transmit the C-phase pulse signal.

[0038] In actual scenarios, each phase pulse signal line is matched and connected to each phase display light. Under the action of the pulse signal transmitted by the first phase pulse signal line 21, the first phase display light D1 can display a brightness that matches the duty cycle of the pulse signal; under the action of the pulse signal transmitted by the second phase pulse signal line 22, the second phase display light D2 can display a brightness that matches the duty cycle of the pulse signal; under the action of the pulse signal transmitted by the third phase pulse signal line 23, the third phase display light D3 can display a brightness that matches the duty cycle of the pulse signal. The phase line ports of the control component 10 include a first phase line port (outputting an A-phase pulse signal), a second phase line port (outputting a B-phase pulse signal), and a third phase line port (outputting a C-phase pulse signal), and the duty cycles of the pulse signals output by each phase line port are different.

[0039] In this way, when the first phase pulse signal line 21 is connected to the first phase line port, the second phase pulse signal line 22 is connected to the second phase line port, and the third phase pulse signal line 23 is connected to the third phase line port, that is, when the phase sequence (or the wiring of the pulse signal line) is correct, the A phase pulse signal can be transmitted to the first phase display light D1, the B phase pulse signal can be transmitted to the second phase display light D2, and the C phase pulse signal can be transmitted to the third phase display light D3. At this time, the brightness of each phase display light matches the duty cycle. For example, the duty cycles of the pulse signals output by the three phases A, B, and C are 10%, 40%, and 70%, respectively. At this time, the brightness of the first phase display light D1 is lower than that of the second phase display light D2, and the brightness of the second phase display light D2 is lower than that of the third phase display light D3.

[0040] If the connection method between each phase pulse signal line and each phase port of the control component 10 is different from the above, that is, there is a wiring error or the phase sequence is incorrect, then the transmission of each phase pulse signal will not match the connected pulse signal line or display light. For example, the A-phase pulse signal is transmitted to the second-phase display light D2 via the second-phase pulse signal line 22, or the A-phase pulse signal is transmitted to the third-phase display light D3 via the third-phase pulse signal line 23. Ultimately, the brightness of each phase display light will be inconsistent with the duty cycle of the respective phase pulse signal.

[0041] For example, in one embodiment, the wiring of phases A and B is reversed, that is, the first-phase pulse signal line 21 is connected to the second-phase line port of the control component 10, and the second-phase pulse signal line 22 is connected to the first-phase line port of the control component 10. This results in the A-phase pulse signal with a 10% duty cycle being transmitted to the second-phase indicator light D2 via the second-phase pulse signal line 22, while the B-phase pulse signal with a 40% duty cycle being transmitted to the first-phase indicator light D1 via the first-phase pulse signal line 21. Ultimately, the brightness of the second-phase indicator light D2 is lower than that of the first-phase indicator light D1, and the brightness of the first-phase indicator light D1 is lower than that of the third-phase indicator light D3.

[0042] Obviously, when the phase sequence is incorrect, the brightness of each phase indicator light is different from the brightness of each phase indicator light when the phase sequence is normal. Therefore, through the technical solution of this application, the user can determine whether the phase sequence is correct by observing the brightness of each phase indicator light in the phase sequence identification device.

[0043] It should be noted that the type of control component 10 is not unique. In one embodiment, the main control device of the converter can be used as the control component 10. In another embodiment, an additional controller can be configured as the control component 10. There is no specific limitation.

[0044] The above-mentioned phase sequence identification device, the control component 10 includes multiple phase line ports, each phase line port is connected to a pulse signal line, that is, the first phase pulse signal line 21, the second phase pulse signal line 22 and the third phase pulse signal line 23 are respectively connected to a phase line port of the control component 10. Pulse signals with different duty cycles can be output through different phase line ports. When the first phase switch K1, the second phase switch K2 and the third phase switch K3 in the switch component 30 are all closed, the first phase display light D1, the second phase display light D2 and the third phase display light D3 can display different brightness. If the phase sequence of the pulse signal line component 20 is correct, that is, the first phase pulse signal line 21 is connected to the first phase line port, the second phase pulse signal line 22 is connected to the second phase line port, and the third phase pulse signal line 23 is connected to the third phase line port, then the brightness displayed by the first phase display light D1, the second phase display light D2 and the third phase display light D3 will be consistent with the duty cycle of the pulse signal outputted accordingly. If the phase sequence of the pulse signal line assembly 20 is incorrect, the brightness of at least two display lights will be inconsistent with the duty cycle of the pulse signal output from their corresponding phases. The above solution implements phase sequence detection by determining whether the brightness of each phase display light in the display assembly 40 is consistent with the duty cycle of the corresponding output pulse signal. This solves the problem of incorrect wiring of the three-phase PWM pulse signal line, which can lead to abnormal rectification and inversion processes in the converter, and even converter failure and component damage.

[0045] Through the above solution, the brightness of each phase display light is used to directly represent the phase sequence of the three phases, which greatly reduces the time cost of subsequent maintenance and inspection.

[0046] It can be understood that the types of the above-mentioned first-phase switch K1, second-phase switch K2 and third-phase switch K3 are not unique. They can be manual switches. When there is a need for phase sequence detection, the user manually closes the first-phase switch K1, second-phase switch K2 and third-phase switch K3 to realize the phase sequence identification operation.

[0047] In addition, in one embodiment, the first phase switch K1 , the second phase switch K2 and the third phase switch K3 are all controllable switches, and the first phase switch K1 , the second phase switch K2 and the third phase switch K3 are respectively connected to the control component 10 .

[0048] Specifically, the type of controllable switch is not limited and can be a transistor, a field effect transistor or a relay switch, etc. There is no specific limitation and the choice can be made based on actual needs.

[0049] In the above solution, a controllable switch is used to construct the switch assembly 30, so that the start and stop of the phase sequence identification device can be controlled by the control assembly 10, thereby improving the degree of automation of the operation of the phase sequence identification device.

[0050] In one embodiment, the switch component 30 is a selection switch component, the input end of the selection switch component is connected to the pulse signal line component 20, the first output end of the selection switch component is connected to the display component 40, and the second output end of the selection switch component is used to connect to the module drive circuit of the inverter.

[0051] Specifically, the module drive circuit is a device used to convert pulse signals into signals suitable for on-off control of power switching elements of devices such as converters. Depending on the actual application scenario, the type and structure of the module drive circuit will also vary. In one embodiment, taking the converter scenario as an example, the module drive circuit includes a first module drive circuit and a second module drive circuit. The first module drive circuit is used to connect to the rectifier circuit of the converter, and the second module drive circuit is used to connect to the inverter circuit of the converter. Correspondingly, the number of pulse signal line components 20, switch components 30 and display components 40 is two. One group of pulse signal line components 20, switch components 30 and display components 40 is built to form a phase sequence identification circuit and is connected to the first module drive circuit. The other group of pulse signal line components 20, switch components 30 and display components 40 is built to form another phase sequence identification circuit and is connected to the second module drive circuit.

[0052] In another embodiment, the module driving circuit may include a first module driving circuit and a second module driving circuit, the number of switch components 30 and display components 40 may be two, and the two phase sequence identification number circuits may share one pulse signal line component 20. The specific selection may be made based on actual needs.

[0053] It is understood that the type of selector switch assembly is not limited. In a more detailed embodiment, the first phase switch K1, the second phase switch K2, and the third phase switch K3 may each be configured as a selector switch, for example, using a single-pole double-throw switch as a single-phase switch. In other embodiments, the selector switch assembly may be constructed using other methods, as long as it can achieve independent control of the circuits in which each phase switch is located and can also realize switching between different paths. There is no specific limitation.

[0054] In the above solution, a selection switch component is configured between the pulse signal line component 20 and the display component 40, which can be selected to realize phase sequence detection, and can also be selected to transmit the pulse signal to the module drive circuit to realize the operation drive of the inverter, and has high operation reliability.

[0055] In one embodiment, the control component 10 is used to control the connection between the selection switch component strobe pulse signal line component 20 and the display component 40 when the inverter is in a standby state.

[0056] Specifically, in the solution of this embodiment, during the standby phase of the converter, the control component 10 controls the selection switch component to perform gating switching, connecting the line between the pulse signal line component 20 and the display component 40, that is, controlling the first phase switch K1, the second phase switch K2, and the third phase switch K3 to be closed, so that the first phase pulse signal line 21 is connected to the first phase display light D1, the second phase pulse signal line 22 is connected to the second phase display light D2, and the third phase pulse signal line 23 is connected to the third phase display light D3. In this way, the pulse signal input to each phase pulse signal line can be transmitted to the corresponding connected display light, thereby realizing the lighting operation of each phase display light.

[0057] The above solution enables the phase sequence detection operation to be performed when the converter is in the standby state, thereby saving the time cost of the converter phase sequence detection.

[0058] Furthermore, the phase sequence is detected in the standby stage of the converter, and the connection between the pulse signal line assembly 20 and the module drive circuit is disconnected before the detection, thereby avoiding the risk of damaging the power components inside the converter due to wiring errors while only detecting the actual pulse line sequence.

[0059] See also Figure 2 In one embodiment, the phase sequence identification device also includes a brightness identification component 50 connected to the control component 10, and the brightness identification component 50 is used to obtain the brightness of the first phase display light D1, the second phase display light D2 and the third phase display light D3, and send the brightness identification result to the control component 10; the control component 10 is also used to determine whether the wiring sequence of the pulse signal line component 20 and the control component 10 is correct based on the brightness identification result.

[0060] Specifically, the brightness recognition component 50 is a device capable of identifying the brightness of each phase display lamp. In actual scenarios, a single brightness recognition component 50 can be used to simultaneously identify the brightness of each phase display lamp, or each phase display lamp can be identified by a separate brightness recognition component 50, without limitation.

[0061] As shown in the above embodiment, the brightness of each phase indicator light varies depending on whether the phase sequence is correct or incorrect. This brightness is directly related to the duty cycle of the pulse signal. Therefore, the target brightness of each phase indicator light can be determined and stored based on the duty cycle of the pulse signal. The brightness recognition result can then be compared with the target brightness to determine whether the phase sequence is correct.

[0062] The above solution can automatically complete the entire phase sequence detection operation by configuring the brightness recognition component 50 to perform brightness recognition, which has the advantage of high detection efficiency and higher detection accuracy than manual detection.

[0063] See also Figure 3In one embodiment, the display component 40 further includes a light shielding box 41, and the first phase display light D1, the second phase display light D2, and the third phase display light D3 are respectively arranged inside a light shielding box 41 (the first phase display light D1 is used as an example for explanation in the figure), and a brightness identification component 50 is correspondingly arranged inside a light shielding box 41.

[0064] Specifically, the light shielding box 41 is a device that performs a light shielding function. This embodiment utilizes three light shielding boxes 41, with each phase indicator light housed within a separate light shielding box 41 to prevent interference between the indicator lights of each phase. It is understood that in other embodiments, light shielding plates may be placed between adjacent indicator lights to mitigate brightness interference between the indicator lights of each phase. The choice of light shielding box 41 will be determined based on actual needs.

[0065] In the above solution, the display lamps of each phase are isolated by the light shielding box 41, thereby avoiding brightness interference between display lamps of different phases during brightness detection, and effectively improving the accuracy of brightness detection.

[0066] In one embodiment, the display assembly 40 further includes a light guide connecting the interior and exterior of the light shielding box 41 .

[0067] Specifically, the light guide column is a device that transmits light from the position of a light source to another point at a certain distance from the light source. This embodiment can transmit light from the inside of the light shielding box 41 to the outside of the light shielding box 41, so that the user can identify the actual display brightness of each phase display light without opening the light shielding box 41.

[0068] In the above solution, a light-guiding column is also provided on the light-shielding box 41, which can connect the inside and outside of the light-shielding box 41, so as to lead out the light displayed by each phase display light for the user to observe, thereby verifying the phase sequence identification result and effectively improving the operational reliability of the phase sequence identification device.

[0069] See also Figure 4 In one embodiment, the brightness recognition component 50 includes a brightness detector 51 and a pre-processing circuit 52 connected to each other, and the pre-processing circuit 52 is connected to the control component 10 (not shown).

[0070] Specifically, brightness detector 51 is a device used to detect the display brightness of the display light. Its type is not limited to a single type and can be a brightness sensor, or a detection circuit constructed using a photoresistor, a photodiode, or a photocoupler. Preprocessing circuit 52 is a circuit used to preprocess the detection results of brightness detector 51 to facilitate recognition processing by control component 10.

[0071] The above solution uses a brightness detector 51 and a preprocessing circuit 52 to build a brightness recognition component 50. The detection result of the brightness detector 51 can be preprocessed and then sent to the control component 10 for recognition processing, which has high brightness detection reliability.

[0072] See also Figure 5 In one embodiment, the preprocessing circuit 52 includes a filter circuit 521 and an analog-to-digital conversion circuit 522 connected to each other, the filter circuit 521 is connected to the brightness detector 51, and the analog-to-digital conversion circuit 522 is connected to the control component 10 (not shown).

[0073] Specifically, after the brightness detector 51 detects brightness-related parameters, it can filter out interference signals such as noise through the filtering circuit 521, and then convert it into a digital signal that is easy to transmit and process by the analog-to-digital conversion circuit 522, and send it to the control component 10 for processing.

[0074] The above solution uses the filter circuit 521 and the analog-to-digital conversion circuit 522 to form the preprocessing circuit 52 . While reliably preprocessing the detection results, it can also effectively save the hardware cost and volume of the brightness recognition component 50 .

[0075] It should be noted that, in one embodiment, if the control component 10 determines that the wiring sequence is incorrect based on the brightness recognition result of the brightness recognition component 50, it can also output an alarm signal to prompt the user to conduct timely maintenance. If the control component 10 determines that the wiring sequence is correct based on the brightness recognition result of the brightness recognition component 50, it can continue to perform other maintenance functions or directly terminate the detection operation, without further limitation.

[0076] See also Figure 6 The present application also provides a converter, including a module drive circuit 60, a converter circuit and the above-mentioned phase sequence identification device, wherein the module drive circuit 60 connects the switch component 30 and the converter circuit.

[0077] Specifically, the structure of the phase sequence identification device is as shown in the above embodiments and the accompanying drawings, and will not be described in detail here. The current conversion circuit is a circuit used to perform the current conversion function.

[0078] In one embodiment, please refer to Figure 6, which includes a rectifier circuit 61, an inverter circuit 62, and a capacitor C. The AC end of the rectifier circuit 61 is used to connect to the AC power grid, and the DC end of the rectifier circuit 61 is connected to the DC end of the inverter circuit 62 via the capacitor C. The AC end of the inverter circuit 62 is connected to an AC load, such as a compressor, etc., which is not specifically limited. The rectifier circuit 61 and the inverter circuit 62 are each connected to a switch component 30 via a module drive circuit 60. The switch component 30 has a switching function. When phase sequence detection is required, the switch component 30 switches the pulse signal line component 20 and the display component 40. In the normal operating state, the switch component 30 switches the pulse signal line component 20 and the module drive circuit 60.

[0079] The above-mentioned converter can output pulse signals with different duty cycles through different phase line ports. When the first phase switch K1, the second phase switch K2 and the third phase switch K3 in the switch assembly 30 are all closed, the first phase display light D1, the second phase display light D2 and the third phase display light D3 can display different brightness. If the phase sequence of the pulse signal line assembly 20 is correct, that is, the first phase pulse signal line 21 is connected to the first phase line port, the second phase pulse signal line 22 is connected to the second phase line port, and the third phase pulse signal line 23 is connected to the third phase line port, then the brightness displayed by the first phase display light D1, the second phase display light D2 and the third phase display light D3 will be consistent with the duty cycle of the pulse signal outputted by each corresponding phase. If the phase sequence of the pulse signal line assembly 20 is incorrect, the display brightness of at least two display lights will be inconsistent with the duty cycle of the pulse signal outputted by their corresponding phases. The above scheme can realize phase sequence detection by judging whether the brightness of each phase display light in the display component 40 is consistent with the duty cycle of the corresponding output pulse signal, thereby solving the problem that the three-phase PWM pulse signal line is easily wired incorrectly, resulting in abnormal rectification and inversion process of the converter, and even converter failure and component damage.

[0080] The present application also provides a photovoltaic storage air conditioner, including the above-mentioned converter.

[0081] Specifically, the structure of the converter is as shown in the above embodiment and the accompanying drawings, and will not be repeated here. The photovoltaic storage air conditioner can output pulse signals with different duty cycles through different phase line ports. When the first phase switch K1, the second phase switch K2, and the third phase switch K3 in the switch assembly 30 are all closed, the first phase display light D1, the second phase display light D2, and the third phase display light D3 can display different brightness. If the phase sequence of the pulse signal line assembly 20 is correct, that is, the first phase pulse signal line 21 is connected to the first phase line port, the second phase pulse signal line 22 is connected to the second phase line port, and the third phase pulse signal line 23 is connected to the third phase line port, then the brightness displayed by the first phase display light D1, the second phase display light D2, and the third phase display light D3 will be consistent with the duty cycle of the pulse signal outputted by each corresponding phase. If the phase sequence of the pulse signal line assembly 20 is incorrect, the display brightness of at least two display lights will be inconsistent with the duty cycle of the pulse signal outputted by their corresponding phases. The above scheme can realize phase sequence detection by judging whether the brightness of each phase display light in the display component 40 is consistent with the duty cycle of the corresponding output pulse signal, thereby solving the problem that the three-phase PWM pulse signal line is easily wired incorrectly, resulting in abnormal rectification and inversion process of the converter, and even converter failure and component damage.

[0082] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A phase sequence identification device, characterized in that: include: Control components; A pulse signal line component, comprising a first-phase pulse signal line, a second-phase pulse signal line, and a third-phase pulse signal line, wherein the first-phase pulse signal line, the second-phase pulse signal line, and the third-phase pulse signal line are respectively connected to a phase line port of the control component; wherein the duty cycles of the pulse signals output by different phase line ports are inconsistent; a switch assembly, comprising a first-phase switch, a second-phase switch, and a third-phase switch; The display component includes a first-phase display light, a second-phase display light and a third-phase display light. The first-phase pulse signal line is connected to the first-phase display light through the first-phase switch, the second-phase pulse signal line is connected to the second-phase display light through the second-phase switch, and the third-phase pulse signal line is connected to the third-phase display light through the third-phase switch.

2. The phase sequence identification device according to claim 1, characterized in that: The first-phase switch, the second-phase switch, and the third-phase switch are all controllable switches, and the first-phase switch, the second-phase switch, and the third-phase switch are respectively connected to the control component.

3. The phase sequence identification device according to claim 1, characterized in that: The switch component is a selection switch component, the input end of the selection switch component is connected to the pulse signal line component, the first output end of the selection switch component is connected to the display component, and the second output end of the selection switch component is used to connect to the module drive circuit of the inverter.

4. The phase sequence identification device according to claim 3, characterized in that: The control component is used to control the selection switch component to enable the connection between the pulse signal line component and the display component when the inverter is in a standby state.

5. The phase sequence identification device according to claim 1, characterized in that: The phase sequence identification device also includes a brightness identification component connected to the control component, and the brightness identification component is used to obtain the brightness of the first phase display light, the second phase display light and the third phase display light, and send the brightness identification result to the control component; the control component is also used to determine whether the wiring sequence of the pulse signal line component and the control component is correct based on the brightness identification result.

6. The phase sequence identification device according to claim 5, characterized in that: The display component further includes a light shielding box, the first phase display light, the second phase display light and the third phase display light are respectively arranged inside one of the light shielding boxes, and one brightness identification component is correspondingly arranged inside one of the light shielding boxes.

7. The phase sequence identification device according to claim 6, characterized in that: The display assembly further includes a light guide column communicating the interior and exterior of the light shielding box.

8. The phase sequence identification device according to claim 5, characterized in that: The brightness recognition component includes a connected brightness detector and a pre-processing circuit, and the pre-processing circuit is connected to the control component.

9. The phase sequence identification device according to claim 8, characterized in that: The pre-processing circuit includes a filter circuit and an analog-to-digital conversion circuit connected to each other. The filter circuit is connected to the brightness detector, and the analog-to-digital conversion circuit is connected to the control component.

10. A converter, characterized in that: It comprises a module drive circuit, a current conversion circuit and the phase sequence identification device according to any one of claims 1 to 9, wherein the module drive circuit is connected to the switch component and the current conversion circuit.

11. A photovoltaic storage air conditioner, characterized in that: The converter comprises the converter according to claim 10.

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