Power supply circuit, air treatment system and power supply detection method

Abstract

The embodiment of the invention provides a power supply circuit, an air treatment system and a power supply detection method, and the power supply circuit comprises a first DC bus which is connected with a load and is provided with a positive electrode bus; a negative bus bar; the first direct current power supply input end is arranged on the positive electrode bus and the negative electrode bus and is used for receiving direct current provided by a direct current power supply; the first direct current power supply input end is arranged on the positive bus, the second direct current power supply input end is arranged on the positive bus and the negative bus and receives direct current obtained after alternating current provided by an alternating current power supply is rectified, the power supply circuit further comprises a film capacitor, and electrodes at the two ends of the film capacitor are connected with the positive bus and the negative bus respectively. According to the invention, different power supplies can be distinguished.

Description

Technical Field

[0001] The present application relates to the technical field of power supply, and particularly to a power supply circuit, an air treatment system, and a power supply detection method. Background Art

[0002] In the past, most air treatment devices such as air conditioners were powered by the mains power supply, that is, 220V - 50HZ alternating current. There is a problem of low power transmission and distribution efficiency in the traditional mains power grid during the power supply process. With the rapid development of energy Internet technology, some areas have begun to use DC power grids for power supply. Therefore, at present, the power supply circuits of some electrical appliances are designed to be able to use both DC power and mains power for power supply.

[0003] It should be noted that the above introduction of the technical background is only for the convenience of clearly and completely explaining the technical solutions of the present application and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well-known to those skilled in the art merely because these solutions are described in the background art part of the present application. Summary of the Invention

[0004] The inventors found that for devices powered by two or more power sources, it is sometimes necessary to detect the type of power supply. For example, in the case of using a DC power source and a mains power source to access the bus to supply power to a load such as an air conditioner, based on the detected type of power supply, further processing or control can be performed. However, in the prior art, the detection methods for the power source type are relatively complex.

[0005] In view of at least one of the above technical problems, an embodiment of the present application provides a power supply circuit and a power supply detection method. A film capacitor is provided between the positive and negative poles of the DC bus of the power supply circuit. The DC voltage obtained after rectifying the alternating current still has a certain pulsation (that is, the ripple voltage is relatively large), while the pulsation of the DC voltage provided by the DC power source is very small (that is, the ripple voltage is relatively small). Since the film capacitor has a small smoothing effect on the ripple voltage, therefore, a film capacitor for filtering is provided between the positive and negative poles of the DC bus, which can avoid changing the ripple voltage, thereby facilitating the distinction of the power supply type through the ripple voltage.

[0006] The power supply circuit of the present application can be used to supply power to loads such as the compressor motor and the fan motor of the air treatment system, and can also be used to supply power to other components or electrical appliances that need to distinguish the power supply type.

[0007] According to one aspect of the embodiments of the present application, a power supply circuit is provided. The power supply circuit includes a first DC bus, which is connected to a load. The first DC bus has: a positive bus; a negative bus; a first DC power input terminal, which is arranged on the positive bus and the negative bus and receives direct current provided by a DC power supply; and a second DC power input terminal, which is arranged on the positive bus and the negative bus and receives direct current obtained by rectifying alternating current provided by an AC power supply. The power supply circuit further includes: a thin-film capacitor, whose two end electrodes are respectively connected to the positive bus and the negative bus.

[0008] In some embodiments, the capacitance of the thin-film capacitor is 10 μF to 120 μF.

[0009] In some embodiments, the power supply circuit further includes: a DC voltage detection module, which is connected to the first DC bus to obtain the DC voltage between the thin-film capacitor and the load. The DC voltage detection module calculates the difference (ΔU) of the ripple voltage of the obtained DC voltage, and determines whether the power supply for the first DC bus is the AC power supply or the DC power supply according to at least one of the differences (ΔU) of the ripple voltage within a first time period.

[0010] In some embodiments, the power supply circuit further includes: a determination module, which is connected to the DC voltage detection module. The determination module determines whether an abnormality occurs in the power supply of the DC power supply based on the determination result of the DC voltage detection module for the power supply.

[0011] In some embodiments, the determination module further determines whether an abnormality occurs in the power supply of the DC power supply based on at least one of the following information: duration information; information on the DC voltage provided by a second DC bus connected to the DC power supply; information on the light intensity; information on a predetermined time period.

[0012] In some embodiments, within a second time period, when the DC voltage detection module determines that the power supply is continuously the AC power supply, the determination module determines that an abnormality has occurred in the power supply of the DC power supply; or when the DC voltage detection module determines that the power supply is the AC power supply in the case where the DC voltage provided by the second DC bus reaches a preset voltage, the determination module determines that an abnormality has occurred in the power supply of the DC power supply; or within consecutive n days, if the DC voltage detection module determines that the power supply is the AC power supply during the time period when the light intensity reaches a predetermined intensity every day, the determination module determines that an abnormality has occurred in the power supply of the DC power supply, where n is a natural number greater than or equal to 2; or within consecutive m days, if the DC voltage detection module determines that the power supply is the AC power supply during a predetermined time period every day, the determination module determines that an abnormality has occurred in the power supply of the DC power supply, where m is a natural number greater than or equal to 2.

[0013] In some embodiments, the DC voltage detection module is disposed on a first circuit board, the first circuit board is powered by direct current and alternating current, the determination module is disposed on a second circuit board, and the second circuit board is powered by alternating current.

[0014] According to another aspect of the embodiments of the present application, there is provided an air handling system, including the power supply circuit described in any one of the above embodiments, wherein the load connected to the first DC bus of the power supply circuit includes at least one of a compressor motor and a fan motor.

[0015] In some embodiments, the DC power supply connected to the power supply circuit includes a photovoltaic power generation circuit, which is connected to the first DC power input terminal of the power supply circuit.

[0016] According to still another aspect of the embodiments of the present application, there is provided a power supply detection method, the power supply detection method including: obtaining a DC voltage on a first DC bus, where the first DC bus receives direct current provided by a DC power supply or receives direct current obtained by rectifying alternating current provided by an AC power supply; and determining the type of the power supply for the first DC bus according to the obtained ripple voltage of the DC voltage.

[0017] In some embodiments, determining the type of the power supply for the first DC bus according to the obtained ripple voltage of the DC voltage includes: calculating a difference (ΔU) between the obtained ripple voltages of the DC voltage; and determining whether the power supply is the AC power supply or the DC power supply according to at least one of the differences (ΔU) in the ripple voltage within a first time period.

[0018] In some embodiments, if the difference (ΔU) of the ripple voltage within the first duration is greater than a preset threshold, it is determined that the power supply is the AC power supply; or if the difference (ΔU) of the ripple voltage within the first duration is less than or equal to the preset threshold, it is determined that the power supply is the DC power supply.

[0019] In some embodiments, the power supply detection method further includes: judging whether there is an abnormality in the power supply of the DC power supply according to the determination result of the power supply.

[0020] In some embodiments, whether there is an abnormality in the power supply of the DC power supply is judged according to at least one of the following information: duration information; information on the DC voltage provided by the second DC bus connected to the DC power supply; information on the light intensity; information on a predetermined time period.

[0021] In some embodiments, judging whether there is an abnormality in the power supply of the DC power supply includes: within the second duration, when it is determined that the power supply is continuously the AC power supply, it is determined that there is an abnormality in the power supply of the DC power supply; or when the DC voltage provided by the second DC bus reaches a preset voltage and it is determined that the power supply is the AC power supply, it is determined that there is an abnormality in the power supply of the DC power supply; or within consecutive n days (n is a natural number greater than or equal to 2), if it is determined that the power supply is the AC power supply within the time period when the light intensity reaches a predetermined intensity every day, it is determined that there is an abnormality in the power supply of the DC power supply; or within consecutive m days (m is a natural number greater than or equal to 2), if it is determined that the power supply is the AC power supply within the predetermined time period every day, it is determined that there is an abnormality in the power supply of the DC power supply.

[0022] In some embodiments, in the case where it is determined that there is an abnormality in the power supply of the DC power supply: when it is determined that the power supply is the DC power supply at least once, the determination of the abnormality in the power supply of the DC power supply is cancelled; or when the cumulative duration of determining that the power supply is the DC power supply is greater than or equal to a third duration, the determination of the abnormality in the power supply of the DC power supply is cancelled, where the third duration is less than the second duration and greater than the first duration;

[0023] Or, in the case where it is not determined that there is an abnormality in the power supply of the DC power supply:

[0024] Within the second duration, when it is determined that the power supply is the DC power supply at least once, the timing of the second duration is cleared; or within the second duration, when the cumulative duration of determining that the power supply is the DC power supply is greater than or equal to the third duration, the timing of the second duration is cleared.

[0025] In some embodiments, when the timing for the second duration is cleared and it is determined that the power supply is the AC power supply, the timing for the second duration is started.

[0026] In some embodiments, when the load of the electrical equipment to which the load connected to the first DC bus belongs is greater than a preset value, the type of the power supply is determined.

[0027] In some embodiments, the power supply detection method further includes at least one of the following operations: generating first notification information for notifying the type according to the determined type of the power supply; determining the amount of power provided by the AC power supply or the amount of power provided by the DC power supply according to the determined type of the power supply.

[0028] In some embodiments, the power supply detection method further includes: generating second notification information for notifying the abnormality when it is determined that the power supply of the DC power supply is abnormal.

[0029] One of the beneficial effects of the embodiments of the present application is that: a thin film capacitor is provided between the positive electrode and the negative electrode of the DC bus of the power supply circuit, and the thin film capacitor can not only play a filtering role, but also avoid changing the ripple voltage, so as to facilitate distinguishing the type of the power supply through the ripple voltage.

[0030] Referring to the following description and the accompanying drawings, specific embodiments of the present application are disclosed in detail, indicating the ways in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope thereby. Within the spirit and terms of the appended claims, the embodiments of the present application include many changes, modifications and equivalents.

[0031] Features described and / or illustrated for one embodiment can be used in the same or similar way in one or more other embodiments, combined with the features in other embodiments, or replace the features in other embodiments.

[0032] It should be emphasized that the term "including / comprising" when used herein refers to the presence of features, whole things, steps or components, but does not exclude the presence or addition of one or more other features, whole things, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings included are used to provide a further understanding of the embodiments of the present application, which form a part of the specification, are used to illustrate the embodiments of the present application, and together with the written description are used to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings according to these drawings without creative efforts. In the drawings:

[0034] Figure 1 is a schematic diagram of the power supply circuit according to an embodiment of the present application;

[0035] Figure 2 is a flowchart of the power supply detection according to an embodiment of the present application;

[0036] Figure 3 is a schematic diagram of the power supply detection method according to an embodiment of the present application. Detailed implementation manners

[0037] Referring to the accompanying drawings and through the following description, the foregoing and other features of the embodiments of the present application will become apparent. In the description and drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the embodiments of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the embodiments of the present application include all modifications, variations, and equivalents falling within the scope of the appended claims.

[0038] In the embodiments of the present application, terms such as "first" and "second" are used to distinguish different elements in terms of name, but do not indicate the spatial arrangement or time sequence of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the associated listed terms. Terms such as "comprise", "include", and "have" mean the presence of the stated features, elements, components, or assemblies, but do not exclude the presence or addition of one or more other features, elements, components, or assemblies.

[0039] In the embodiments of the present application, the singular forms "a", "the", etc. include the plural forms and should be broadly understood as "a kind of" or "a class of" rather than being limited to the meaning of "one"; in addition, the term "the" should be understood to include both the singular form and the plural form unless the context clearly indicates otherwise. In addition, the term "according to" should be understood as "at least partially according to...", and the term "based on" should be understood as "at least partially based on...", unless the context clearly indicates otherwise.

[0040] Features described and / or illustrated for one embodiment can be used in the same or similar manner in one or more other embodiments, combined with the features in other embodiments, or replace the features in other embodiments. The term "include / comprise" as used herein means the presence of features, whole, steps, or components, but does not exclude the presence or addition of one or more other features, whole, steps, or components.

[0041] In the embodiments of the present application, "coupled" or "connected" between components may refer to a direct electrical connection or mechanical connection between components, or may refer to an electrical connection between components through a conductive component or other intermediate element or a mechanical connection through an intermediate structure.

[0042] The embodiments of the present application will be specifically described below.

[0043] Embodiments of the first aspect

[0044] The embodiments of the first aspect of the present application provide a power supply circuit.

[0045] Figure 1 It is a schematic diagram of the power supply circuit of the embodiments of the present application. As Figure 1 shown, the power supply circuit 100 includes:

[0046] A first DC bus 101, a first DC power input terminal 102, a second DC power input terminal 103, and a thin film capacitor 105.

[0047] The first DC bus 101 includes two power lines, namely a positive bus 101a and a negative bus 101b. The first DC bus 101 has a first DC power input terminal 102 and a second DC power input terminal 103, and the first DC bus 101 is also connected to a load 104.

[0048] The first DC power input terminal 102 includes a positive electrode 102a of the first DC power input terminal and a negative electrode 102b of the first DC power input terminal. Among them, the positive electrode 102a of the first DC power input terminal is arranged on the positive bus 101a, and the negative electrode 102b of the first DC power input terminal is arranged on the negative bus 101b. The first DC power input terminal 102 is connected to a DC power supply 107 and receives direct current provided by the DC power supply 107. The DC power supply 107 is, for example, a DC power supply device, such as a photovoltaic module, a storage battery, etc., but the present application is not limited thereto.

[0049] The second DC power input terminal 103 includes a positive electrode 103a of the second DC power input terminal and a negative electrode 103b of the second DC power input terminal. Among them, the positive electrode 103a of the second DC power input terminal is disposed on the positive bus 101a, and the negative electrode 103b of the second DC power input terminal is disposed on the negative bus 101b. The second DC power input terminal 103 receives the direct current obtained by rectifying the alternating current provided by the AC power supply 106. The AC power supply 106 is, for example, the mains power supply provided by the mains power grid. Optionally, the voltage of the direct current transmitted by the first DC power input terminal 102 is, for example, 375V±10%, 530V±10%, 590V±10%, 600V±10%, 650V±10% or 750V±10%, and the voltage of the alternating current of the AC power supply is, for example, 380V or 220V. Among them, the DC voltage of 375V corresponds to the AC voltage of 220V, and both are applicable to household air conditioners; the DC voltages of 530V, 590V, 600V, 650V, and 750V correspond to the AC voltage of 380V, and are all applicable to commercial air conditioners. Therefore, when the DC voltage is higher than the AC voltage, using the power supply circuit of the embodiment of the present application can realize the automatic selection of the AC and DC power supplies according to the voltage level. For example, when the photovoltaic power generation is insufficient, the DC voltage drops to be lower than the relatively stable AC voltage. At this time, the outdoor unit automatically selects to use the AC power supply. For example, when the photovoltaic power generation is sufficient, the DC voltage is higher than the AC voltage. At this time, the outdoor unit automatically selects the DC power supply.

[0050] The two end electrodes of the film capacitor 105 are respectively connected to the positive bus 101a and the negative bus 101b of the first DC bus 101. In some embodiments, the film capacitor 105 can be used for harmonic suppression (i.e., filtering) and realizes miniaturization of circuit components. In addition, the DC voltage obtained after rectifying the alternating current still has a certain pulsation (i.e., the ripple voltage is large), while the pulsation of the DC voltage provided by the DC power supply is very small (i.e., the ripple voltage is small). Since the smoothing effect of the film capacitor 105 on the ripple voltage is small, therefore, the capacitor between the positive bus and the negative bus of the first DC bus is set as a film capacitor, which can avoid the capacitor from changing the ripple voltage on the first DC bus, thereby facilitating the distinction of the type of power supply through the ripple voltage.

[0051] In contrast, if, for example, an electrolytic capacitor is provided between the positive bus and the negative bus of the first DC bus, the electrolytic capacitor can smooth the ripple voltage on the DC bus, so that the type of power supply cannot be judged through the ripple voltage.

[0052] In some embodiments, the capacitance of the thin film capacitor 105 is 10 μF to 120 μF, for example, 30 μF to 60 μF. The capacitance of the thin film capacitor affects the magnitude of the ripple voltage. If the capacitance is too large, the ripple voltage is not obvious, making it difficult to distinguish between an AC power supply and a DC power supply. Therefore, selecting an appropriate capacitance for the thin film capacitor can effectively distinguish between an AC power supply and a DC power supply.

[0053] In some embodiments, as Figure 1 shown, the power supply circuit 100 further includes: a DC voltage detection module 110, which is connected to the first DC bus 101 to obtain the DC voltage between the thin film capacitor 105 and the load 104. The DC voltage detection module 110 calculates the difference (ΔU) of the ripple voltage of the obtained DC voltage, and determines whether the power supply for the first DC bus 101 is an AC power supply 106 or a DC power supply 107 based on at least one such difference (ΔU) of the ripple voltage within the first time period. Thus, by detecting the DC voltage downstream of the thin film capacitor through the DC voltage detection module 110, the ripple voltages of the DC power supply and the AC power supply can be detected, and an effective determination of the power supply can be made.

[0054] In the embodiments of the present application, the difference (ΔU) of the ripple voltage is, for example, the difference between the peak value and the valley value of the ripple voltage.

[0055] In the present application, the method for determining the power supply based on the difference (ΔU) of the ripple voltage is, for example: if the differences (ΔU) of the ripple voltage within the first time period are all greater than the preset threshold, it is determined that the power supply is an AC power supply 106. In addition, if the differences (ΔU) of the ripple voltage within the first time period are all less than or equal to the preset threshold, it is determined that the power supply is a DC power supply 107.

[0056] Among them, the calculation method of the difference (ΔU) of the ripple voltage is, for example, that within the first time period, there is at least one first time interval T, and for the peak value (U max ) and valley value (U min ) of the ripple voltage that appear within each first time interval T: calculate the difference between the maximum value of the peak values and the minimum value of the valley values as the difference (ΔU) of the ripple voltage corresponding to the first time interval T; or calculate the difference between the average value of more than one peak value (for example, all peak values) and the average value of more than one valley value (for example, all valley values) within the first time interval T as the difference (ΔU) of the ripple voltage corresponding to the first time interval T.

[0057] In the present application, when the DC voltage detection module 110 determines that the power supply is a DC power supply, it can generate and send a first signal. When the DC voltage detection module 110 determines that the power supply is an AC power supply, it can generate and send a second signal. For example, corresponding to each first duration, the DC voltage detection module 110 generates a first signal or a second signal. The first signal can be 1, and the second signal can be 0. Thus, the determination result of the DC voltage detection module 110 can correspondingly include a bit string containing 01.

[0058] In some embodiments, as Figure 1 shown, the power supply circuit 100 further includes: a determination module 120, which is connected to the DC voltage detection module 110 (for example, the determination module 120 can receive the first signal or the second signal). The determination module 120 determines whether an abnormality occurs in the DC power supply based on the determination result of the DC voltage detection module 110 regarding the power supply. In the embodiments of the present application, the determination module 120 performs the above determination, for example, when the air conditioner is operating.

[0059] In some embodiments, the determination module 120 can combine the determination result of the DC voltage detection module 110 regarding the power supply with at least one of the following information to determine whether an abnormality occurs in the DC power supply. The information is, for example: duration information; information on the DC voltage provided by the second DC bus connected to the DC power supply 107; information on the light intensity; information on a predetermined time period, etc. Thus, the determination module 120 can determine whether the DC power supply is abnormal based on different methods, enhancing the stability and reliability of the detection of power supply abnormalities.

[0060] For example, within the second duration, when the DC voltage detection module 110 determines that the power supply is continuously an AC power supply 106 (for example, continuously receives the second signal 0 within the second duration), the determination module 120 determines that an abnormality occurs in the DC power supply. Otherwise, it is determined that the DC power supply is normal.

[0061] Again, for example, when the DC voltage provided by the second DC bus reaches the preset voltage, and when the DC voltage detection module 110 determines that the power supply is an AC power supply 106, the determination module 120 determines that an abnormality occurs in the DC power supply. Otherwise, it is determined that the DC power supply is normal. Among them, the second DC bus is, for example, the DC bus in a building. Specifically, in some examples, the voltage value of the DC voltage provided by the second DC bus can be sent to the determination module 120 by devices such as a server. When the DC voltage provided by the second DC bus reaches the preset voltage, if the DC voltage detection module 110 determines that the power supply is an AC power supply 106, the determination module 120 determines that an abnormality occurs in the DC power supply.

[0062] For another example, within consecutive n days, if the DC voltage detection module 110 determines that the power supply is an AC power supply 106 during the time period when the light intensity reaches a predetermined intensity every day, the determination module 120 determines that an abnormality occurs in the DC power supply. Here, n is a natural number greater than or equal to 2. Otherwise, it is determined that the DC power supply is normal. Among them, the information about the light intensity can come from meteorological information or outdoor light intensity detection devices, etc. n is greater than or equal to 2 to reduce the determination error.

[0063] For still another example, within consecutive m days, if the DC voltage detection module 110 determines that the power supply is an AC power supply 106 during a predetermined time period every day, the determination module 120 determines that an abnormality occurs in the DC power supply. Here, m is a natural number greater than or equal to 2. Optionally, the predetermined time period is, for example, from 2 pm to 3 pm every day. The predetermined time period can also be other time periods with sufficient light every day, such as from 1 pm to 2 pm every day, etc. This application is not limited thereto. m is greater than or equal to 2 to avoid the situation where the photovoltaic power generation is insufficient during the predetermined time period on rainy or cloudy days and the DC power supply is not used, and to reduce the determination error.

[0064] In this application, the abnormality of the DC power supply can include: an abnormality occurs in the DC power supply 107; or, the DC power supply 107 is normal, but an abnormality occurs in the circuit connecting the DC power supply 107 to the first DC bus 101; or, an abnormality occurs in the DC power supply 107, and an abnormality also occurs in the circuit connecting the DC power supply 107 to the first DC bus 101, etc.

[0065] Figure 2 is a flowchart of the DC voltage detection module and the determination module in the embodiment of this application during operation. In Figure 2 the dashed box 21 is the process for the DC voltage detection module 110 to determine the power supply type, and the dashed box 22 is the process for the determination module 120 to determine whether there is an abnormality in the DC power supply.

[0066] In operation 211, the DC voltage detection module 110 can obtain the DC voltage on the first DC bus 101 according to the first time interval T.

[0067] In operation 212, the DC voltage detection module 110 calculates the difference △U of the ripple voltages corresponding to each first time interval T.

[0068] In operation 213, the DC voltage detection module 110 calculates the average value of the differences △U of the ripple voltages corresponding to multiple first time intervals T within the first duration, and determines whether the average value is greater than a preset threshold.

[0069] When the determination in operation 213 is "yes", the determination in operation 214 is that the power supply is an AC power supply, that is, the power supply for power supply is an AC power supply.

[0070] When the determination in operation 213 is "No", the determination in operation 215 is that the power supply is a DC power supply, that is, the power supply for power supply is a DC power supply.

[0071] The determination results of operation 214 and operation 215 are both sent to the determination module 120. For example, operation 215 sends the first signal described above, and operation 214 sends the second signal described above.

[0072] In operation 221, the determination module 120 determines whether the determination result of DC power supply is received within the second time period. If the determination is "No" (that is, within the second time period, all the received determination results are for AC power supply and no determination result of DC power supply is received), then in operation 222, it is determined that the DC power supply is abnormal.

[0073] Among them, when the determination module 120 has not yet determined that the DC power supply is abnormal, the determination module 120 can start a timer for the second time period when receiving the determination result of "AC power supply" (for example, when the determination module 120 receives the second signal sent by operation 214). Thus, the timing for the second time period starts, so as to be able to determine the second time period for the judgment of operation 221.

[0074] In addition, when the determination module 120 has not yet determined that the DC power supply is abnormal, if the determination in operation 221 is "Yes" (that is, the determination result of DC power supply is received within the second time period), then in operation 223, the determination module 120 determines that the DC power supply is normal. In addition, when the timing for the second time period is in progress, in operation 223, the timing for the second time period can also be cleared (for example, the timer is cleared).

[0075] Among them, receiving the determination result of DC power supply within the second time period may include:

[0076] Determining that the power supply is a DC power supply at least once within the second time period. For example, receiving the first signal sent by operation 215 at least once within the second time period; or

[0077] The cumulative time for determining that the power supply is a DC power supply within the second time period is greater than or equal to a third time period, and the third time period is less than the second time period and greater than the first time period. For example, the cumulative time for receiving the first signal sent by operation 215 within the second time period is greater than or equal to the third time period.

[0078] In addition, in operation 222, the timing for the second time period can also be cleared or the timing can be stopped.

[0079] After operation 222 (i.e., when the determination module 120 determines that the DC power supply is abnormal), in operation 224, the determination module 120 determines whether the output signal of operation 214 or operation 215 satisfies the condition for releasing the DC power supply abnormality. If the determination is "no", the operation 222 is returned to continue to maintain the determination result of the DC power supply abnormality. If the determination is "yes", operation 225 is performed to release the determination of the DC power supply abnormality.

[0080] In operation 224, the condition for relieving the abnormal DC power supply is met, for example, any of the following conditions is met:

[0081] Determining at least once that the power source is a DC power source, for example, receiving the first signal sent in operation 215; or

[0082] The accumulated time for determining that the power source is a DC power source is greater than or equal to a third time, which is less than the second time and greater than the first time. For example, the accumulated time for receiving the first signal sent in operation 215 is greater than or equal to the third time.

[0083] exist Figure 2 In the operation of the dotted box 22, when the timer for the second duration is reset, if it is again determined that the power is supplied by the AC power supply (for example, the determination module 120 receives the second signal sent by operation 214), then the timer for the second duration is restarted.

[0084] exist Figure 2 The dashed box 22 only shows an embodiment of determining whether the DC power supply is abnormal based on the determination result and time information of the DC voltage detection module 110. As mentioned above, the present application is not limited thereto, and it is also possible to determine whether the DC power supply is abnormal based on other information.

[0085] like Figure 1 As shown, in some embodiments, the DC voltage detection module 110 is arranged on a first circuit board 1100, which can be powered by DC power and AC power, and the determination module 120 is arranged on a second circuit board 1200, which can be powered by AC power.

[0086] In the embodiments of the present application, the first circuit board 1100 is, for example, an inverter circuit board disposed in the outdoor machine's electric control box, and the second circuit board 1200 is, for example, a main control circuit board disposed in the outdoor machine's electric control box. Among them, the first circuit board 1100 is powered by direct current and alternating current (for example, mains power), and the second circuit board 1200 is powered by alternating current. In actual application scenarios, the direct current power supply may be unstable (for example, the power generation of photovoltaic power generation is unstable, and the power storage battery may also have a low power supply), so using alternating current to power the second circuit board 1200 can avoid abnormal conditions such as power switching fluctuations, thereby ensuring the operation stability of the components connected to the second circuit board 1200.

[0087] In addition, as Figure 1 shown, the power supply circuit 100 may also have other circuit elements. For example, a first one-way protection element 131 and a second one-way protection element 132 are respectively provided at the positive pole 102a and the negative pole 102b of the first direct current power supply input terminal of the power supply circuit 100.

[0088] In some embodiments, the first one-way protection element 131 may have a first PN junction, and the positive pole 102a of the first input terminal may be connected to the N-type region of the first PN junction. Thus, by using the reverse cut-off characteristic of the first PN junction, the current is prevented from flowing from the positive pole 102a of the first input terminal to the P-type region of the first PN junction; the second one-way protection element 132 may have a second PN junction, and the negative pole 102b of the first input terminal may be connected to the P-type region of the second PN junction. Thus, by using the reverse cut-off characteristic of the second PN junction, the current is prevented from flowing from the N-type region of the second PN junction to the negative pole 102b of the first input terminal.

[0089] In some example embodiments, as Figure 1 shown, the first one-way protection element 131 is a first diode, and the second one-way protection element 132 is a second diode. The positive pole 102a of the first direct current power supply input terminal is connected to the cathode of the first diode, and the negative pole 102b of the first direct current power supply input terminal is connected to the anode of the second diode. Thus, the structures of the first one-way protection element and the second one-way protection element are simple and the cost is low.

[0090] In addition, the first one-way protection element 131 and the second one-way protection element 132 may also be other types of electronic components or circuits, which are not limited in the present application. For example, the first one-way protection element 121 or the second one-way protection element 132 may be a metal oxide semiconductor field effect transistor (MOSFET).

[0091] For example, the first unidirectional protection element 131 is a P-channel metal-oxide-semiconductor field-effect transistor (PMOSFET). The gate of the PMOSFET is input with a low potential, thereby forming a P-type channel in the N-type substrate. Thus, the P-type channel and the N-type substrate can form the above-mentioned first PN junction. Among them, the N-type substrate (i.e., the N-type region of the first PN junction) is connected to the positive pole 102a of the first input terminal, and the source electrode of the PMOSFET is connected to the DC power supply 107. Using a PMOSFET as the first unidirectional protection element 104 has a small voltage drop across the device, low losses and temperature rise, and a simple drive circuit.

[0092] Again, for example, the second unidirectional protection element 132 is an N-channel metal-oxide-semiconductor field-effect transistor (NMOSFET). The gate of the NMOSFET is input with a high potential, thereby forming an N-type channel in the P-type substrate. Thus, the P-type substrate and the N-type channel can form the above-mentioned second PN junction. Among them, the P-type substrate (i.e., the P-type region of the second PN junction) is connected to the negative pole 102b of the first input terminal, and the drain electrode of the NMOSFET is connected to the DC power supply 107. Using an NMOSFET as the second unidirectional protection element 105 has a low cost, a small voltage drop across the device, low losses and temperature rise, and a simple drive circuit.

[0093] Thus, by providing unidirectional protection elements at both the positive and negative poles of the DC power supply input terminal of the power supply circuit, it is possible to effectively prevent the current from flowing back to the DC power supply, protect the DC power supply and other devices connected to the DC power supply. Moreover, when a reverse voltage is generated on the first DC bus, the first unidirectional protection element and the second unidirectional protection element 105 can share the reverse voltage, improve the reliability of anti-backflow, and extend the service life of the first unidirectional protection element and the second unidirectional protection element. In addition, when the positive and negative poles of the DC power supply wires are connected reversely, it is possible to avoid the reverse voltage being applied to the DC bus, thereby avoiding damage to the circuit elements connected to the DC bus and improving the safety and reliability of the power supply device.

[0094] The power supply circuit 100 may also have a rectification circuit 140, which has an AC power input terminal 111 and a DC power output terminal 112. The DC power output terminal 112 is connected to the second DC power input terminal 103. The rectification circuit 110 rectifies the alternating current of the AC power supply 106 into direct current and outputs it from the DC power output terminal 112 to the first DC bus 101. Thus, the alternating current generated by the mains power supply can be rectified into direct current for use by the load. The rectification circuit 140 may include a plurality of diode bridges, or the rectification circuit 140 may also adopt other circuit structures, and the present application does not limit this. Optionally, the power supply circuit 100 may also have an inversion circuit 150, which is arranged between the first DC bus 101 and the load 104. The inversion circuit 150 converts the direct current on the first DC bus 101 into alternating current for driving the load 104. In some cases, the inversion circuit 150 is not necessary. For example, when the load 104 can be driven by direct current, there is no need to use the inversion circuit 150 for DC-AC conversion.

[0095] Embodiments of the second aspect

[0096] An embodiment of the second aspect of the present application provides an air treatment system, including the power supply circuit 100 as described in the embodiment of the first aspect of the present application. The load 104 connected to the first DC bus 101 of the power supply circuit 100 is, for example, at least one of a compressor motor and a fan motor. The DC power supply 107 connected to the power supply circuit 100 may include a photovoltaic power generation circuit (not shown), and the photovoltaic power generation circuit may be connected to the first DC power input terminal 102 of the power supply circuit 100. For example, the photovoltaic power generation circuit may be connected to the first DC power input terminal 102 of the power supply circuit 100 through a first one-way protection element 131 and a second one-way protection element 132.

[0097] In addition, the air conditioner of the embodiment of the present application at least also includes all the beneficial effects of the power supply circuit in the embodiment of the first aspect above, which will not be elaborated here one by one. It should be noted that the power supply circuit of the embodiment of the present application can also be applied to other components or electrical appliances that need to distinguish power supplies.

[0098] Embodiments of the third aspect

[0099] An embodiment of the third aspect of the present application provides a power supply detection method, corresponding to the power supply circuit in the embodiment of the first aspect.

[0100] Figure 3 It is a schematic diagram of the power supply detection method in the embodiment of the present application.

[0101] As Figure 3 shown, the power supply detection method 300 includes:

[0102] Operation 310: Obtain the DC voltage on the first DC bus, where the first DC bus receives the direct current provided by a DC power supply or the direct current obtained after rectifying the alternating current provided by an AC power supply;

[0103] Operation 320: Determine the type of the power supply that powers the first DC bus according to the ripple voltage of the obtained DC voltage.

[0104] In the embodiments of the present application, determining the type of the power supply based on the ripple voltage is simple and easy to implement.

[0105] The determination result regarding the type of the power supply can be applied to the determination of abnormal DC power supply, or can be applied to uses such as statistics of power consumption of different power supplies.

[0106] For a detailed description of Operations 310 and 320, reference can be made to the description of the DC voltage detection module 110 in the embodiments of the first aspect.

[0107] In some embodiments, determining the type of the power supply that powers the first DC bus according to the ripple voltage of the obtained DC voltage includes: calculating the difference (ΔU) of the ripple voltage of the obtained DC voltage; and determining whether the power supply is an AC power supply or a DC power supply according to at least one difference (ΔU) of the ripple voltage within the first time period.

[0108] In some embodiments, if the differences (ΔU) of the ripple voltage within the first time period are all greater than a preset threshold, it is determined that the power supply is an AC power supply; or if the differences (ΔU) of the ripple voltage within the first time period are all less than or equal to the preset threshold, it is determined that the power supply is a DC power supply.

[0109] In some embodiments, within the first time period, there is at least one first time interval, and for the peak value (U max ) and the valley value (U min ) of the ripple voltage that appear in each first time interval: calculate the difference between the maximum value of the peak values and the minimum value of the valley values as the difference (ΔU) of the ripple voltage corresponding to the first time interval; or calculate the difference between the average value of the peak values and the average value of the valley values as the difference (ΔU) of the ripple voltage corresponding to the first time interval.

[0110] In some embodiments, when the load of the electrical equipment to which the load connected to the first DC bus belongs is greater than a preset value, the type of the power supply is determined (i.e., operation 320 is performed). The electrical equipment to which the load connected to the first DC bus belongs may be an air handling system (e.g., an air conditioning system); the load of the electrical equipment being greater than the preset value may, for example, mean that the operating power of the outdoor unit of the air conditioner reaches the preset value, or the operating current of the outdoor unit of the air conditioner reaches the preset value, etc. Thus, it is possible to avoid the small ripple voltage when the load is too small, and determine the type of the power supply when the load is greater than the preset value, which can improve the detection accuracy.

[0111] As Figure 3 shown, in some embodiments, the power supply detection method further includes:

[0112] Operation 330: According to the determination result of the power supply in operation 320, determine whether there is an abnormality in the DC power supply.

[0113] Among them, this operation 330 can be performed when the load on the first DC bus 101 is operating.

[0114] For the description of operation 330, reference can be made to the description of the determination module 120 in the embodiments of the first aspect.

[0115] In some embodiments of operation 330, on the basis of using the determination result of the power supply, whether there is an abnormality in the DC power supply can also be determined according to at least one of the following information. This information includes: duration information; information on the DC voltage provided by the second DC bus connected to the DC power supply; information on the light intensity; information on a predetermined time period.

[0116] In some embodiments, to determine whether there is an abnormality in the DC power supply, for example: within a second duration, when it is determined that the power supply is continuously an AC power supply, it is determined that there is an abnormality in the DC power supply.

[0117] Also, for example, when the DC voltage provided by the second DC bus reaches a preset voltage, when it is determined that the power supply is an AC power supply, it is determined that there is an abnormality in the DC power supply.

[0118] Still, for example, within consecutive n days, if it is determined that the power supply is an AC power supply during the time period when the light intensity reaches a predetermined intensity every day, it is determined that there is an abnormality in the DC power supply, where n is a natural number greater than or equal to 2.

[0119] For another example, within consecutive m days, if it is determined that the power supply is the AC power supply within the predetermined time period of each day, it is determined that an abnormality occurs in the DC power supply. Here, m is a natural number greater than or equal to 2. Optionally, for example, the predetermined time period is from 2:00 pm to 3:00 pm every day. The predetermined time period can also be other time periods with sufficient sunlight every day, such as from 1:00 pm to 2:00 pm every day, etc. This application is not limited thereto.

[0120] In this application, in the case where it is determined that the DC power supply is abnormal:

[0121] When it is determined at least once that the power supply is the DC power supply, the determination of the abnormality of the DC power supply is cancelled; or

[0122] When the cumulative duration during which it is determined that the power supply is the DC power supply is greater than or equal to the third duration, the determination of the abnormality of the DC power supply is cancelled, where the third duration is less than the second duration and greater than the first duration.

[0123] In this application, in the case where it is not determined that the DC power supply is abnormal:

[0124] Within the second duration, when it is determined at least once that the power supply is the DC power supply, the timing of the second duration is cleared; or

[0125] Within the second duration, when the cumulative duration during which it is determined that the power supply is the DC power supply is greater than or equal to the third duration, the timing of the second duration is cleared.

[0126] As Figure 3 shown, in some embodiments, the power supply detection method further includes at least one of the following operations:

[0127] Operation 340: Generate first notification information for notification according to the determined type of the power supply; or determine the power quantity provided by the AC power supply or the power quantity provided by the DC power supply according to the determined type of the power supply.

[0128] As Figure 3 shown, in some embodiments, the power supply detection method further includes:

[0129] Operation 350: Generate second notification information for notification of abnormality when it is determined that an abnormality occurs in the DC power supply.

[0130] Thus, by generating the first notification information and the second notification information, the abnormal situation of the DC power supply or the type of the power supply can be reported in a timely manner, and relevant actions can be taken in a timely manner according to the notification information.

[0131] The embodiments of this application further provide a computer-readable program, where when the program is executed, the program causes the computer to execute the power supply detection method described in the embodiments of this application.

[0132] An embodiment of the present application further provides a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer-readable program causes a computer to execute the power supply detection method described in the embodiment of the present application.

[0133] The above-mentioned device and method of the embodiment of the present application can be implemented by hardware or by a combination of hardware and software. The present application relates to such a computer-readable program that when executed by a logic component, can enable the logic component to implement the above-mentioned device or component, or enable the logic component to implement the above-mentioned various methods or steps.

[0134] The embodiment of the present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0135] The above-mentioned device and method of the present application can be implemented by hardware or by a combination of hardware and software. The present application relates to such a computer-readable program that when executed by a logic component, can enable the logic component to implement the device or component described above, or enable the logic component to implement the various methods or steps described above. The present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0136] The method / device described in combination with the embodiment of the present application can be directly embodied as hardware, a software module executed by a processor, or a combination of the two. For example, one or more of the functional block diagrams shown in the figure and / or a combination of one or more of the functional block diagrams can correspond to each software module in the computer program flow, and can also correspond to each hardware module. These software modules can respectively correspond to the various steps shown in the figure. These hardware modules can be implemented by solidifying these software modules using a field programmable gate array (FPGA).

[0137] The software module can be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium can be a component of the processor. The processor and the storage medium can be located in an ASIC. The software module can be stored in the memory of the mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a larger-capacity MEGA-SIM card or a large-capacity flash device, the software module can be stored in the MEGA-SIM card or the large-capacity flash device.

[0138] One or more of the functional blocks described in the accompanying drawings and / or one or more combinations of functional blocks can be implemented as a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described in the present application. One or more of the functional blocks described in the accompanying drawings and / or one or more combinations of functional blocks can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication combination with a DSP, or any other such configuration.

[0139] It should be noted that the limitations on the steps involved in the present application, without affecting the implementation of the specific solution, are not considered to limit the order of the steps. The steps written in the front can be executed first, or can be executed later, or even can be executed simultaneously, as long as the solution can be implemented, it should be regarded as falling within the protection scope of the present application.

[0140] The present application has been described in conjunction with specific embodiments, but those skilled in the art should understand that these descriptions are exemplary and not a limitation on the protection scope of the present application. Those skilled in the art can make various variations and modifications to the present application according to the spirit and principle of the present application, and these variations and modifications are also within the scope of the present application.

Claims

1. A power supply circuit, characterized in that, the power supply circuit includes a first DC bus, and the first DC bus is connected to a load, the first DC bus has: a positive bus; a negative bus; a first DC power input terminal, which is arranged on the positive bus and the negative bus and receives direct current provided by a DC power supply; and a second DC power input terminal, which is arranged on the positive bus and the negative bus and receives direct current obtained after rectifying alternating current provided by an AC power supply, the power supply circuit further includes: a film capacitor, and both ends of the electrodes thereof are respectively connected to the positive bus and the negative bus.

2. The power supply circuit according to claim 1, characterized in that, the capacitance of the film capacitor is 10 μF to 120 μF.

3. The power supply circuit according to claim 1, characterized in that, the power supply circuit further includes: a DC voltage detection module, which is connected to the first DC bus and acquires the DC voltage between the film capacitor and the load, the DC voltage detection module calculates the difference of the ripple voltage of the acquired DC voltage, and judges whether the power supply for the first DC bus is the AC power supply or the DC power supply according to at least one of the differences of the ripple voltages within a first time period.

4. The power supply circuit according to claim 3, characterized in that, the power supply circuit further includes: a determination module, which is connected to the DC voltage detection module, the determination module judges whether there is an abnormality in the power supply of the DC power supply based on the determination result of the DC voltage detection module for the power supply.

5. The power supply circuit according to claim 4, characterized in that, the determination module also judges whether there is an abnormality in the power supply of the DC power supply based on at least one of the following information: duration information; information of the DC voltage provided by a second DC bus connected to the DC power supply; information of the light intensity; information of a predetermined time period.

6. The power supply circuit according to claim 5, characterized in that, within a second time period, when the DC voltage detection module determines that the power supply is continuously the AC power supply, the determination module determines that there is an abnormality in the power supply of the DC power supply; or when the DC voltage provided by the second DC bus reaches a preset voltage, and when the DC voltage detection module determines that the power supply is the AC power supply, the determination module determines that there is an abnormality in the power supply of the DC power supply; or within consecutive n days (n is a natural number greater than or equal to 2), if the DC voltage detection module determines that the power supply is the AC power supply within the time period when the light intensity reaches a predetermined intensity every day, then the determination module determines that there is an abnormality in the power supply of the DC power supply; or within consecutive m days (m is a natural number greater than or equal to 2), if the DC voltage detection module determines that the power supply is the AC power supply within the predetermined time period every day, then the determination module determines that there is an abnormality in the power supply of the DC power supply.

7. The power supply circuit according to claim 4, characterized in that, The DC voltage detection module is arranged on the first circuit board, and the first circuit board is powered by direct current and alternating current. The determination module is arranged on the second circuit board, and the second circuit board is powered by alternating current.

8. An air treatment system, characterized in that, The air handling system includes the power supply circuit according to any one of claims 1 to 7, wherein the loads connected to the first DC bus of the power supply circuit include at least one of a compressor motor and a fan motor.

9. The air handling system according to claim 8, wherein The DC power supply connected to the power supply circuit includes a photovoltaic power generation circuit, which is connected to the first DC power input terminal of the power supply circuit.

10. A power supply detection method, characterized in that, The power supply detection method includes: Obtaining the DC voltage on the first DC bus, where the first DC bus receives the direct current provided by the DC power supply or the direct current obtained by rectifying the alternating current provided by the AC power supply; and Judging the type of the power supply for the first DC bus according to the obtained ripple voltage of the DC voltage.

11. The power supply detection method according to claim 10, wherein Judging the type of the power supply for the first DC bus according to the obtained ripple voltage of the DC voltage includes: Calculating the difference of the obtained ripple voltage of the DC voltage; and Judging whether the power supply is the AC power supply or the DC power supply according to at least one of the differences of the ripple voltages within the first time period.

12. The power supply detection method according to claim 11, wherein If the differences of the ripple voltages within the first time period are all greater than a preset threshold, it is judged that the power supply is the AC power supply; or If the differences of the ripple voltages within the first time period are all less than or equal to the preset threshold, it is judged that the power supply is the DC power supply.

13. The power supply detection method according to claim 10, wherein The power supply detection method further includes: Judging whether the power supply of the DC power supply is abnormal according to the determination result of the power supply.

14. The power supply detection method according to claim 13, wherein Judging whether the power supply of the DC power supply is abnormal is also based on at least one of the following information: Duration information; Information on the DC voltage provided by the second DC bus connected to the DC power supply; Information on the light intensity; Information on a predetermined time period.

15. The power supply detection method according to claim 14, wherein Judging whether the power supply of the DC power supply is abnormal includes: Within the second time period, when it is determined that the power supply is continuously the AC power supply, it is determined that the power supply of the DC power supply is abnormal; or When the DC voltage provided by the second DC bus reaches a preset voltage, when it is determined that the power supply is the AC power supply, it is determined that the power supply of the DC power supply is abnormal; or Within consecutive n days, if it is determined that the power supply is the AC power supply within the time period when the light intensity reaches a predetermined intensity every day, it is determined that the power supply of the DC power supply is abnormal, where n is a natural number greater than or equal to 2; or Within consecutive m days, if it is determined that the power supply is the AC power supply within the scheduled time period each day, it is determined that there is an abnormality in the power supply of the DC power supply, where m is a natural number greater than or equal to 2.

16. The power supply detection method according to claim 15, wherein In the case where it is determined that there is an abnormality in the power supply of the DC power supply: When it is determined at least once that the power supply is the DC power supply, the determination of the abnormality in the power supply of the DC power supply is cancelled; Or When the cumulative duration during which it is determined that the power supply is the DC power supply is greater than or equal to a third duration, the determination of the abnormality in the power supply of the DC power supply is cancelled, where the third duration is less than the second duration and greater than the first duration. Or, in the case where it is not determined that there is an abnormality in the power supply of the DC power supply: Within the second duration, when it is determined at least once that the power supply is the DC power supply, the timing of the second duration is cleared; or Within the second duration, when the cumulative duration during which it is determined that the power supply is the DC power supply is greater than or equal to the third duration, the timing of the second duration is cleared.

17. The power supply detection method according to claim 16, wherein In the case where the timing of the second duration is cleared, When it is determined that the power supply is the AC power supply, the timing of the second duration is started.

18. The power supply detection method according to claim 10, wherein When the load of the electrical equipment to which the load connected to the first DC bus belongs is greater than a preset value, the power supply detection method is executed.

19. The power supply detection method according to any one of claims 10-18, characterized in that, The power supply detection method further includes at least one of the following operations: Generating first notification information for notifying the type according to the determined type of the power supply; Determining the amount of power provided by the AC power supply or the amount of power provided by the DC power supply according to the determined type of the power supply.

20. The power supply detection method according to any one of claims 13-18, characterized in that, The power supply detection method further includes: Generating second notification information for notifying the abnormality when it is determined that there is an abnormality in the power supply of the DC power supply.

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