AC signal acquisition circuit and AC signal detection circuit

Abstract

The utility model discloses an AC signal acquisition circuit and an AC signal detection circuit. The circuit comprises: an AC signal access module, wherein the AC signal access module comprises a first port, a second port and a third port; the input end of the first voltage acquisition circuit is respectively connected with the first port and the second port; the input end of the second voltage acquisition circuit is respectively connected with the first port and the third port; the input end of the third voltage acquisition circuit is respectively connected with the second port and the third port; wherein each of the first voltage acquisition circuit, the second voltage acquisition circuit and the third voltage acquisition circuit comprises an alternating current signal acquisition circuit, a direct current component acquisition circuit and a phase acquisition circuit. According to the embodiment of the invention, the acquisition of the AC signal parameters between any two phase lines in the three-phase AC voltage is realized at the same time, so that the problem that the signal parameters of the power supply system cannot be timely and accurately acquired to cause the failure of electric equipment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to an AC signal acquisition circuit and an AC signal detection circuit. Background Art

[0002] With the continuous advancement of science and technology and the continuous development of power technology, alternating current (AC) is widely used in all areas of people's lives, providing convenience for people's production and life. For electrical equipment that uses AC as its power supply system, various parameters of AC voltage can be detected to prevent electrical equipment failures.

[0003] In related technologies, separate hardware circuits can be used to collect different parameters in AC voltage signals. However, when testing power supply systems, the different parameters of the AC voltage signal may be time-sensitive during transmission, leading to inaccurate judgments about the power supply system. This can cause equipment powered by AC power to malfunction, resulting in serious consequences. Summary of the Invention

[0004] An embodiment of the present application provides an AC signal acquisition circuit and an AC signal detection circuit, which obtains the voltage signals of each phase line in the three-phase AC power through an AC signal access module, and inputs the voltage signals of each phase line into a first voltage acquisition circuit, a second AC voltage acquisition circuit, and a third voltage parameter acquisition circuit, thereby enabling the simultaneous acquisition of AC voltage parameters between any two phase lines in the three-phase AC voltage, thereby avoiding the problem of electrical equipment failure caused by the inability to timely and accurately obtain power supply system signal parameters.

[0005] In the first aspect, according to an embodiment of the present invention, an AC signal acquisition circuit is proposed, including: an AC signal access module, the AC signal access module including a first port, a second port and a third port, and the first port, the second port and the third port are respectively connected to the first phase line, the second phase line and the third phase line in the three-phase AC power; a first voltage acquisition circuit, whose input end is respectively connected to the first port and the second port to acquire the voltage of the first phase line and the second phase line; a second voltage acquisition circuit, whose input end is respectively connected to the first port and the third port to acquire the voltage of the first phase line and the third phase line; a third voltage acquisition circuit, whose input end is respectively connected to the second port and the third port to acquire the voltage of the second phase line and the third phase line; wherein the first voltage acquisition circuit, the second voltage acquisition circuit and the third voltage acquisition circuit all include an AC signal acquisition circuit, a DC component acquisition circuit and a phase acquisition circuit.

[0006] In one embodiment, the AC voltage signal parameter acquisition circuit, the DC component voltage signal parameter acquisition circuit, and the phase parameter acquisition circuit are connected in parallel.

[0007] In one embodiment, the AC voltage signal parameter acquisition circuit of the first voltage acquisition circuit includes a first voltage divider module connected to the first port and a second voltage divider module connected to the second port, and the first voltage divider module is also connected to the second voltage divider module through a first filtering module; the AC voltage signal parameter acquisition circuit of the second voltage acquisition circuit includes a third voltage divider module connected to the first port and a fourth voltage divider module connected to the third port, and the third voltage divider module is also connected to the fourth voltage divider module through a second filtering module; the AC voltage signal parameter acquisition circuit of the third voltage acquisition circuit includes a fifth voltage divider module connected to the second port and a sixth voltage divider module connected to the third port, and the fifth voltage divider module is also connected to the sixth voltage divider module through a third filtering module.

[0008] In one embodiment, the first voltage divider module includes a first resistor, the first resistor includes a plurality of resistor elements connected in series and / or in parallel, the second voltage divider module includes a second resistor, the second resistor includes a plurality of resistor elements connected in series and / or in parallel; the AC voltage signal parameter acquisition circuit of the first voltage acquisition circuit includes a first resistor connected to the first port and a second resistor connected to the second port, the first resistor is further connected to the second resistor through a first capacitor; the third voltage divider module includes a third resistor, the third resistor includes a plurality of resistor elements connected in series and / or in parallel, the fourth voltage divider module includes a fourth resistor, the fourth resistor includes a plurality of resistor elements connected in series and / or in parallel. resistance elements; the AC voltage signal parameter acquisition circuit of the second voltage acquisition circuit includes a third resistor connected to the first port and a fourth resistor connected to the third port, and the third resistor is also connected to the fourth resistor through a second capacitor; the fifth voltage divider module includes a fifth resistor, and the fifth resistor includes a plurality of resistance elements connected in series and / or in parallel; the sixth voltage divider module includes a sixth resistor, and the sixth resistor includes a plurality of resistance elements connected in series and / or in parallel; the AC voltage signal parameter acquisition circuit of the third voltage acquisition circuit includes a fifth resistor connected to the second port and a sixth resistor connected to the third port, and the fifth resistor is also connected to the sixth resistor through a third capacitor.

[0009] In one embodiment, the DC component voltage signal parameter acquisition circuit of the first voltage acquisition circuit includes a fourth filtering module connected to the first port and the second port; the DC component voltage signal parameter acquisition circuit of the second voltage acquisition circuit includes a fifth filtering module connected to the first port and the third port; and the DC component voltage signal parameter acquisition circuit of the third voltage acquisition circuit includes a sixth filtering module connected to the second port and the third port.

[0010] In one embodiment, the fourth filtering module includes: a first-stage or multi-stage filtering circuit; the fourth filtering module includes at least: a seventh resistor connected to the first port and an eighth resistor connected to the second port, and the seventh resistor is also connected to the eighth resistor through a fourth capacitor; the fifth filtering module includes: a first-stage or multi-stage filtering circuit; the fifth filtering module includes at least: a ninth resistor connected to the first port and a tenth resistor connected to the third port, and the ninth resistor is also connected to the tenth resistor through a fifth capacitor; the sixth filtering module includes: a first-stage or multi-stage filtering circuit; the sixth filtering module includes at least: an eleventh resistor connected to the second port and a twelfth resistor connected to the third port, and the eleventh resistor is also connected to the twelfth resistor through a sixth capacitor.

[0011] In one embodiment, the phase parameter acquisition circuit of the first voltage acquisition circuit includes a seventh voltage divider module connected to the first port and an eighth voltage divider module connected to the second port, the seventh voltage divider module is further connected to the eighth voltage divider module through the first rectifier module, and the seventh filter module and the first digital-to-analog conversion circuit are respectively connected in parallel with the first rectifier module; the phase parameter acquisition circuit of the second voltage acquisition circuit includes a ninth voltage divider module connected to the first port and a tenth voltage divider module connected to the third port, the ninth voltage divider module is further connected to the tenth voltage divider module through the second rectifier module, and the eighth filter module and the second digital-to-analog conversion circuit are respectively connected in parallel with the second rectifier module; the phase parameter acquisition circuit of the third voltage acquisition circuit includes an eleventh voltage divider module connected to the second port and a twelfth voltage divider module connected to the third port, the eleventh voltage divider module is further connected to the twelfth voltage divider module through the third rectifier module, and the ninth filter module and the third digital-to-analog conversion circuit are respectively connected in parallel with the third rectifier module.

[0012] In one embodiment, the seventh voltage divider module includes a thirteenth resistor, the thirteenth resistor includes a plurality of resistance elements connected in series and / or in parallel, the eighth voltage divider module includes a fourteenth resistor, the fourteenth resistor includes a plurality of resistance elements connected in series and / or in parallel, the phase parameter acquisition circuit of the first voltage acquisition circuit includes a thirteenth resistor connected to the first port and a fourteenth resistor connected to the second port, the thirteenth resistor is also connected to the fourteenth resistor through a first diode, and the seventh capacitor and the first isolation conversion circuit are respectively connected in parallel with the first diode; the ninth voltage divider module includes a fifteenth resistor, the fifteenth resistor includes a plurality of resistance elements connected in series and / or in parallel, the tenth voltage divider module includes a sixteenth resistor, the sixteenth resistor includes a plurality of resistance elements connected in series and / or in parallel, and the second voltage acquisition circuit includes a sixteenth resistor. The phase parameter acquisition circuit of the circuit includes a fifteenth resistor connected to the first port and a sixteenth resistor connected to the second port, the fifteenth resistor is also connected to the sixteenth resistor through a second diode, and the eighth capacitor and the second isolation conversion circuit are respectively connected in parallel with the second diode; the eleventh voltage divider module includes a seventeenth resistor, the seventeenth resistor includes multiple resistance elements connected in series and / or in parallel, the twelfth voltage divider module includes an eighteenth resistor, the eighteenth resistor includes multiple resistance elements connected in series and / or in parallel, the phase parameter acquisition circuit of the second voltage acquisition circuit includes the seventeenth resistor connected to the first port and the eighteenth resistor connected to the third port, the seventeenth resistor is also connected to the eighteenth resistor through a third diode, and the ninth capacitor and the third isolation conversion circuit are respectively connected in parallel with the third diode.

[0013] In one embodiment, the AC signal parameter acquisition circuit further includes: one or more isolation circuits, whose input ends are respectively connected to the AC signal access module and the first voltage acquisition circuit, or whose input ends are respectively connected to the AC signal access module and the second voltage acquisition circuit; or whose input ends are respectively connected to the AC signal access module and the third voltage acquisition circuit.

[0014] In a second aspect, an embodiment of the present application provides an AC signal parameter detection circuit, comprising:

[0015] An AC signal parameter acquisition circuit, implementing the AC signal parameter acquisition circuit as in the first aspect or any one of the embodiments of the first aspect;

[0016] The analog signal sampling circuit has an input end connected to the output end of the AC signal parameter acquisition circuit, and an output end of the analog signal sampling circuit connected to the input end of the processing chip.

[0017] The embodiments of the present utility application provide an AC signal parameter acquisition circuit and an AC signal detection circuit, which obtain the voltage signals of each phase line in the three-phase AC power through an AC signal access module, and input the voltage signal combination of each phase line into the first voltage acquisition circuit, the second voltage acquisition circuit and the third voltage acquisition circuit, thereby being able to simultaneously acquire the AC signal parameters between any two phase lines in the three-phase AC voltage, thereby avoiding the problem of electrical equipment failure caused by the inability to timely and accurately obtain the power supply system signal parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic diagram of an AC signal acquisition circuit provided by an embodiment of the present application is shown;

[0020] Figure 2 A schematic diagram of an AC signal current acquisition method according to an embodiment of the present application is shown;

[0021] Figure 3 A schematic diagram of another AC signal acquisition circuit provided by an embodiment of the present application is shown;

[0022] Figure 4 A schematic diagram of another AC signal acquisition circuit provided by an embodiment of the present application is shown;

[0023] Figure 5 A schematic diagram showing another implementation of an AC signal parameter acquisition circuit provided by an embodiment of the present application;

[0024] Figure 6 A schematic diagram of an AC voltage detection circuit provided by an embodiment of the present application is shown;

[0025] Figure 7 A schematic diagram of an AC signal acquisition circuit between AC phases AB provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0027] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0028] With the continuous advancement of science and technology and the continuous development of power technology, three-phase alternating current (AC) has become widely used in all areas of our lives. Three-phase AC can be a combination of three symmetrical sinusoidal AC currents with a phase difference of 120°. It is generated by three symmetrical windings in a three-phase generator. Each winding, along with its external circuit, is called a phase and is labeled A, B, and C, respectively.

[0029] In related technologies, some electronic devices, including inverters and grid-connected devices, that use AC power as their power supply system can implement the collection of AC signal parameters such as AC voltage signals, DC component voltage signals, and the phase sequence of AC voltages A, B, and C by deploying separate hardware circuits. Furthermore, the collected AC signal parameters can be transmitted to a control chip to implement control and protection of the inverter (INV) AC voltage.

[0030] However, in the related art, since the separately deployed AC signal acquisition circuits are different circuits, timeliness issues may arise when transmitting parameter information. Even worse, the parameter information may be delayed or lagged, causing the control chip to be unable to accurately determine whether there is an abnormality in the AC power supply system, thereby causing electrical equipment using AC as a power supply system to malfunction, resulting in serious consequences.

[0031] In order to solve the problems in the prior art, the embodiments of the present application provide an AC signal acquisition circuit and an AC signal detection circuit. The AC signal acquisition circuit provided in the embodiments of the present application is first introduced below.

[0032] Figure 1 FIG1 shows a schematic diagram of an AC signal acquisition circuit provided by an embodiment of the present application. Figure 1 As shown, the AC signal acquisition circuit 100 includes:

[0033] AC signal access module 110;

[0034] The AC signal access module 110 includes a first port 111, a second port 112, and a third port 113. The first port 111, the second port 112, and the third port 113 are respectively used to connect to each phase of the three-phase AC power.

[0035] In an embodiment of the present application, the first port 111 can be connected to the first phase of three-phase alternating current, the second port 112 can be connected to the second phase of three-phase alternating current, and the third port 113 can be connected to the third phase of three-phase alternating current. The first phase of the alternating current can be any one of the three-phase alternating currents. The second phase can be another phase of the three-phase alternating current that is different from the first phase. The third phase can be another phase of the three-phase alternating current that is different from the first and second phases. In one example, the first port of the AC signal access module can be connected to phase A of the three-phase alternating current; the second port can be connected to phase B of the three-phase alternating current; and the third port can be connected to phase C of the three-phase alternating current.

[0036] A first voltage acquisition circuit 120;

[0037] Furthermore, the input end of the first voltage acquisition circuit 120 can be connected to the first port 111 and the second port 112 of the AC signal access module 110. In one example, the input signal of the first voltage acquisition circuit can be phase A and phase B of three-phase AC power.

[0038] In the embodiment of the present application, the voltage parameter detection between the first phase line and the second phase line can be implemented by the first voltage acquisition circuit 120 .

[0039] In the embodiment of the present application, the first voltage acquisition circuit 120 may include an AC signal acquisition circuit 121, a DC component acquisition circuit 122, and a phase acquisition circuit 123. Furthermore, the AC voltage parameters between the first and second phase lines can be determined by the AC signal acquisition circuit 121. The DC component parameters between the first and second phase lines can be determined by the DC component acquisition circuit 122. The phase sequence and frequency between the first and second phase lines can be determined by the phase acquisition circuit 123.

[0040] Furthermore, it can be understood that in order to simultaneously measure the AC voltage parameters, DC component parameters, phase sequence and frequency between the first phase line and the second phase line, the AC signal acquisition circuit 121, the DC component acquisition circuit 122 and the phase acquisition circuit 123 can be connected in parallel to the AC signal access module 110.

[0041] A second voltage acquisition circuit 130;

[0042] Furthermore, the input end of the second voltage acquisition circuit 130 can be connected to the first port 111 and the third port 113 in the AC signal access module 110. In one example, the input signal of the second voltage acquisition circuit can be phase A and phase C of three-phase AC power.

[0043] In the embodiment of the present application, the voltage parameter detection between the first phase line and the third phase line can be implemented by the second voltage acquisition circuit 130 .

[0044] In the embodiment of the present application, the second voltage acquisition circuit 130 may include an AC signal acquisition circuit 131, a DC component acquisition circuit 132, and a phase acquisition circuit 133. Furthermore, the AC voltage parameters between the first and third phase lines may be determined by the AC signal acquisition circuit 131. The DC component parameters between the first and third phase lines may be determined by the DC component acquisition circuit 132. The phase sequence and frequency between the first and third phase lines may be determined by the phase acquisition circuit 133.

[0045] Furthermore, it can be understood that the AC signal acquisition circuit 131 , the DC component acquisition circuit 132 and the phase acquisition circuit 133 in the second voltage acquisition circuit 130 can be connected to the AC signal access module 110 in parallel.

[0046] A third voltage acquisition circuit 140;

[0047] Furthermore, an input end of the third voltage acquisition circuit 140 may be connected to the second port 112 and the third port 113 in the AC signal access module 110 .

[0048] In one example, the input signal of the third voltage acquisition circuit 140 may be phase B and phase C of the three-phase alternating current.

[0049] In the embodiment of the present application, the voltage between the second phase line and the third phase line can be collected by the third voltage collection circuit 140 .

[0050] In the embodiment of the present application, the third voltage acquisition circuit 140 may include an AC signal acquisition circuit 141, a DC component acquisition circuit 142, and a phase acquisition circuit 143. Furthermore, the AC voltage parameters between the second and third phase lines may be determined by the AC signal acquisition circuit 141. The DC component parameters between the second and third phase lines may be determined by the DC component acquisition circuit 142. The phase sequence and frequency between the second and third phase lines may be determined by the phase acquisition circuit 143.

[0051] Furthermore, it can be understood that the AC signal acquisition circuit 141 , the DC component acquisition circuit 142 and the phase acquisition circuit 143 in the third voltage acquisition circuit 140 can be connected to the AC signal access module 110 in parallel.

[0052] The AC signal parameter acquisition circuit provided in the embodiment of the present application obtains the voltage signals of each phase line in the three-phase AC power through the AC signal access module, and inputs the relative voltage signal combination of each AC power into the first voltage acquisition circuit, the second voltage acquisition circuit and the third voltage acquisition circuit, thereby being able to simultaneously acquire the voltage parameters between any two phase lines in the three-phase AC voltage, thereby avoiding the problem of electrical equipment failure caused by the inability to timely and accurately obtain the power supply system signal parameters.

[0053] In order to realize the acquisition of AC signals between different phase lines of AC power, as another implementation method of the present application, the present application also provides an implementation method of the AC signal acquisition circuit, and details are shown in the following embodiments.

[0054] Figure 2 FIG1 shows a schematic diagram of an AC signal acquisition circuit provided by an embodiment of the present application. Figure 2 The AC voltage collection circuit provided in the present application may include: an AC signal collection circuit 121 of a first voltage collection circuit 120 includes a first voltage dividing module 1211 connected to a first port 111 and a second voltage dividing module 1212 connected to a second port 112, the first voltage dividing module 1211 further being connected to the second voltage dividing module 1212 via a first filtering module 1213;

[0055] The AC signal acquisition circuit 131 of the second voltage acquisition circuit 130 includes a third voltage divider module 1311 connected to the first port 111 and a fourth voltage divider module 1312 connected to the third port 113. The third voltage divider module 1311 is further connected to the fourth voltage divider module 1312 via a second filter module 1313.

[0056] The AC signal acquisition circuit 141 of the third voltage acquisition circuit 140 includes a fifth voltage divider module 1411 connected to the second port 112 and a sixth voltage divider module 1412 connected to the third port 113. The fifth voltage divider module 1411 is further connected to the sixth voltage divider module 1412 via a third filter module 1413. In the embodiment of the present application, the first voltage divider module 1211 and the second voltage divider module 1212 included in the AC signal acquisition circuit 121 of the first voltage acquisition circuit 120 can be used to reduce the voltage between the first phase line and the second phase line, thereby ensuring that the AC signal acquisition circuit 121 can output an AC signal of an appropriate magnitude. Furthermore, while reducing the voltage between the first phase line and the second phase line, the first voltage divider module 1211 and the second voltage divider module 1212 can also ensure that other signal parameters between the first phase line and the second phase line are maintained, such as the frequency and period of the AC signal, thereby ensuring the accuracy of the collected AC signal.

[0057] It can be understood that the third voltage divider module 1311 and the fourth voltage divider module 1312 included in the AC signal acquisition circuit 131 of the second voltage acquisition circuit 130, as well as the fifth voltage divider module 1411 and the sixth voltage divider module 1412 included in the AC signal acquisition circuit 141 of the third voltage acquisition circuit 140, have the same functions as the first voltage divider module 1211 and the second voltage divider module 1212, and will not be elaborated on here.

[0058] In the embodiment of the present application, the voltage divider modules of each voltage acquisition circuit may be different resistors, and each resistor may be composed of multiple resistance elements connected in series and / or in parallel, thereby realizing the voltage reduction function of the voltage divider module.

[0059] In the embodiment of the present application, the first voltage divider module 1211 in the AC signal acquisition circuit 121 of the first voltage acquisition circuit 120 may include a first resistor, wherein the first resistor may be a plurality of resistor elements connected in series and / or in parallel. The second voltage divider module 1212 may include a second circuit, and the second resistor may be a plurality of resistor elements connected in series and / or in parallel. The first filtering module 1213 may include a first capacitor.

[0060] In an embodiment of the present application, the first resistor may be connected to the first port, the second resistor may be connected to the second port, and the first resistor may be further connected to the second resistor via a first capacitor.

[0061] In the embodiment of the present application, the third voltage divider module 1311 in the AC signal acquisition circuit 131 of the second voltage acquisition circuit 130 may include a third resistor, wherein the third resistor may be multiple resistor elements connected in series and / or in parallel. The fourth voltage divider module 1312 may include a fourth resistor, wherein the fourth resistor may be multiple resistor elements connected in series and / or in parallel. The second filtering module 1313 may include a second capacitor.

[0062] In the embodiment of the present application, the third resistor can be connected to the first port, the fourth resistor can be connected to the third port, and the third resistor is further connected to the fourth resistor through the second capacitor.

[0063] In the embodiment of the present application, the fifth voltage divider module 1411 in the AC signal acquisition circuit 141 of the third voltage acquisition circuit 140 may include a fifth resistor, wherein the fifth resistor may be multiple resistor elements connected in series and / or in parallel. The sixth voltage divider module 1412 may include a sixth resistor, wherein the sixth resistor may be multiple resistor elements connected in series and / or in parallel. The third filtering module 1413 may include a third capacitor.

[0064] In the embodiment of the present application, the fifth resistor can be connected to the second port, the sixth resistor can be connected to the third port, and the fifth resistor is further connected to the sixth resistor through the third capacitor.

[0065] In the embodiment of the present application, each resistor in the AC signal acquisition circuit of the first voltage acquisition circuit, the second voltage acquisition circuit, and the third voltage acquisition circuit can be used to reduce the voltage and isolate the AC voltage signals of the respective access ports.

[0066] In the embodiment of the present application, the filtering module in the AC signal acquisition circuit of each voltage acquisition circuit can realize filtering of the AC voltage signal between the AC phases, and can also reflect the AC voltage signal between the AC phases through the AC voltage signal corresponding to the filtering module, thereby ensuring that the AC voltage signal between the AC phases can be input to the control chip at a lower voltage value, so as to facilitate the control chip to perform measurement.

[0067] In an embodiment of the present application, an AC signal acquisition circuit is used to collect the AC voltage signal parameters between each AC current in the AC power, so that it is possible to analyze whether there is an AC overvoltage problem in the AC power supply system based on the collected AC voltage signal, thereby avoiding failure of electrical equipment.

[0068] In order to realize the acquisition of DC component signals between respective phases of AC power, as another implementation method of the present application, the present application also provides an implementation method of a DC component acquisition circuit, and details are shown in the following embodiments.

[0069] Figure 3 FIG2 shows a schematic diagram of another AC signal acquisition circuit provided by an embodiment of the present application. Figure 3 , the AC signal acquisition circuit provided in this application may include:

[0070] The DC component acquisition circuit 122 of the first voltage acquisition circuit 120 may include a fourth filtering module 1221 connected to the first port 111 and the second port 112;

[0071] The DC component acquisition circuit 132 of the second voltage acquisition circuit 130 may include a fifth filtering module 1321 connected to the first port 111 and the third port 113;

[0072] The DC component acquisition circuit 142 of the third voltage acquisition circuit 140 includes a sixth filtering module 1421 connected to the second port 112 and the third port 113 .

[0073] In the embodiment of the present application, each filtering module in the first voltage acquisition circuit, the second voltage acquisition circuit, and the third voltage acquisition circuit can filter out the AC signal between the AC phases and keep the DC voltage between the AC phases basically unchanged.

[0074] In the embodiment of the present application, the fourth filtering module may include: a one-stage or multi-stage filtering circuit.

[0075] Furthermore, the fourth filtering circuit includes at least a seventh resistor, a fourth capacitor, and an eighth resistor connected in series in sequence, and the seventh resistor can be connected to the first port, and the eighth resistor can be connected to the second port, and the seventh resistor is also connected to the eighth resistor through the fourth capacitor.

[0076] In the embodiment of the present application, the fifth filtering module may include: a one-stage or multi-stage filtering circuit.

[0077] Furthermore, the fifth filtering circuit includes at least a ninth resistor, a fifth capacitor, and a tenth resistor connected in series in sequence, and the ninth resistor can be connected to the first port, and the tenth resistor can be connected to the third port, and the ninth resistor is also connected to the tenth resistor through the fifth capacitor.

[0078] In the embodiment of the present application, the sixth filtering module may include: a one-stage or multi-stage filtering circuit.

[0079] Furthermore, the sixth filtering circuit includes at least an eleventh resistor, a sixth capacitor, and a twelfth resistor connected in series in sequence, and the eleventh resistor can be connected to the second port, and the twelfth resistor can be connected to the third port, and the eleventh resistor is also connected to the twelfth resistor through the sixth capacitor.

[0080] In the embodiment of the present application, the DC component between each relative AC power is collected through each DC component collection circuit, so that it is possible to determine whether there is a fault in the power supply system based on the collected DC component, thereby avoiding failure of electrical equipment.

[0081] In order to realize the acquisition of phase parameters between each phase of alternating current, as another implementation method of the present application, the present application also provides an implementation method of a phase parameter acquisition circuit, and details are shown in the following embodiments.

[0082] Figure 4 FIG2 shows a schematic diagram of another AC signal acquisition circuit provided by an embodiment of the present application. Figure 4 Another AC signal acquisition circuit provided by the present application may include:

[0083] The phase acquisition circuit 123 of the first voltage acquisition circuit 120 may include a seventh voltage divider module 1231 connected to the first port 111 and an eighth voltage divider module 1232 connected to the second port 112. The seventh voltage divider module 1231 is further connected to the eighth voltage divider module 1232 via a first rectifier module 1233. Furthermore, a seventh filter module 1234 and a first digital-to-analog conversion circuit 1235 are respectively connected in parallel to the first rectifier module 1233.

[0084] The phase acquisition circuit 133 of the second voltage acquisition circuit 130 includes a ninth voltage divider module 1331 connected to the first port 111 and a tenth voltage divider module 1332 connected to the third port 113. The ninth voltage divider module 1331 is further connected to the tenth voltage divider module 1332 via a second rectifier module 1333. Furthermore, an eighth filter module 1334 and a second digital-to-analog conversion circuit 1335 are respectively connected in parallel to the second rectifier module 1333.

[0085] The phase acquisition circuit 143 of the third voltage acquisition circuit 140 includes an eleventh voltage divider module 1431 connected to the second port 112 and a twelfth voltage divider module 1432 connected to the third port 113. The eleventh voltage divider module 1431 is further connected to the twelfth voltage divider module 1432 via a third rectifier module 1433. In addition, a ninth filter module 1434 and a third digital-to-analog conversion circuit 1435 are respectively connected in parallel to the third rectifier module 1433.

[0086] In the embodiment of the present application, the seventh voltage divider module 1231 may include a thirteenth resistor. The thirteenth resistor may be composed of multiple resistor elements connected in series and / or in parallel. The eighth voltage divider module 1232 may include a fourteenth resistor. The fourteenth resistor may be composed of multiple resistor elements connected in series and / or in parallel.

[0087] Furthermore, the phase acquisition circuit 123 of the first voltage acquisition circuit 120 may be composed of a thirteenth resistor, a fourteenth resistor, and a first diode connected in series, with the seventh capacitor and the first isolation conversion circuit respectively connected in parallel with the first diode. Furthermore, the thirteenth resistor is connected to the first port, and the fourteenth resistor is connected to the second port.

[0088] In the embodiment of the present application, the ninth voltage divider module 1331 includes a fifteenth resistor. The fifteenth resistor can be composed of multiple resistor elements connected in series and / or in parallel. The tenth voltage divider module 1332 includes a sixteenth resistor. The sixteenth resistor can be composed of multiple resistor elements connected in series and / or in parallel.

[0089] In the embodiment of the present application, the phase acquisition circuit 133 of the second voltage acquisition circuit 130 includes a fifteenth resistor connected to the first port 111 and a sixteenth resistor connected to the second port 112 .

[0090] Furthermore, the phase acquisition circuit 133 of the second voltage acquisition circuit 130 may be composed of a fifteenth resistor, a second diode, and a sixteenth resistor connected in series, and the eighth capacitor and the second isolation conversion circuit are respectively connected in parallel with the second diode.

[0091] In the embodiment of the present application, the eleventh voltage divider module 1431 in the phase acquisition circuit 143 of the third voltage acquisition circuit 140 includes a seventeenth resistor, which can be composed of multiple resistor elements connected in series and / or in parallel. The twelfth voltage divider module 1432 includes an eighteenth resistor, which can be composed of multiple resistor elements connected in series and / or in parallel.

[0092] In the embodiment of the present application, the phase acquisition circuit 143 of the third voltage acquisition circuit 140 includes a seventeenth resistor connected to the first port 111 and an eighteenth resistor connected to the third port 113 .

[0093] Furthermore, the phase acquisition circuit 143 of the third voltage acquisition circuit 140 may be composed of a seventeenth resistor, a third diode, and an eighteenth resistor connected in series, and a ninth capacitor and a third isolation conversion circuit are respectively connected in parallel with the third diode.

[0094] In the embodiment of the present application, each phase acquisition circuit can realize the rectification of the AC signal between the AC phases through the unidirectional conductivity of the rectifier module.

[0095] In the embodiment of the present application, the filtering modules in each phase acquisition circuit are connected in parallel at both ends of the corresponding rectifier module, thereby ensuring the smoothness of the signal output by the rectifier module.

[0096] In the embodiment of the present application, it can be understood that when the rectifier circuit is turned on, the digital-to-analog conversion circuit can be triggered, thereby converting the analog signal between the alternating current phases into a digital signal.

[0097] In the embodiment of the present application, the isolation conversion circuit in each phase acquisition circuit is not limited to an optocoupler, but can also be an isolation principle such as capacitive isolation and transformer isolation, which can isolate the high-voltage signal and output the corresponding low-voltage signal.

[0098] In an embodiment of the present application, the phase parameters between each phase of the AC power are collected through a phase acquisition circuit, so that the phase sequence and frequency of the AC power can be determined based on the collected phase parameters, and then the current state of each AC phase can be judged. Based on the current state of each AC phase, it can be judged whether there is a fault in the power supply system to avoid failure of electrical equipment.

[0099] In order to avoid voltage coupling between AC phases, as another implementation of the present application, the present application also provides another implementation of the AC signal parameter acquisition circuit, which is detailed in the following embodiments.

[0100] Figure 5 A schematic diagram showing another implementation of an AC signal parameter acquisition circuit provided by an embodiment of the present application is shown. Figure 5 , the AC signal parameter acquisition circuit provided in this application may include:

[0101] AC signal access module 110;

[0102] A first voltage acquisition circuit 120;

[0103] A second voltage acquisition circuit 130;

[0104] A third voltage acquisition circuit 140;

[0105] Isolation circuit 150, wherein the isolation circuit can be one or more, and its input end is respectively connected to the AC signal access module and the first voltage acquisition circuit, or its input end is respectively connected to the AC signal access module and the second voltage acquisition circuit; or its input end is respectively connected to the AC signal access module and the third voltage acquisition circuit.

[0106] Furthermore, the isolation circuit corresponds to the first voltage acquisition circuit, the second voltage acquisition circuit, and the third voltage acquisition circuit. It is understood that the isolation circuit can be deployed between each port in the AC signal access module and the signal parameter acquisition circuit corresponding to the first AC power, the signal parameter acquisition circuit corresponding to the second AC power, and the signal parameter acquisition circuit corresponding to the third AC power. In one example, the AC signal parameter acquisition circuit may include 6 isolation circuits, namely a first isolation circuit, a second isolation circuit, a third isolation circuit, a fourth isolation circuit, a fifth isolation circuit and a sixth isolation circuit, and one end of the first isolation circuit is connected to the first port, and the other end of the first isolation circuit is a signal parameter acquisition circuit between the first AC power; one end of the second isolation circuit is connected to the second port, and the other end of the second isolation circuit is a signal parameter acquisition circuit between the first AC power; one end of the third isolation circuit is connected to the first port, and the other end of the third isolation circuit is a signal parameter acquisition circuit between the second AC power; one end of the fourth isolation circuit is connected to the third port, and the other end of the fourth isolation circuit is a signal parameter acquisition circuit between the third AC power; one end of the fifth isolation circuit is connected to the second port, and the other end of the fifth isolation circuit is a signal parameter acquisition circuit between the third AC power; one end of the sixth isolation circuit is connected to the third port, and the other end of the fifth isolation circuit is a signal parameter acquisition circuit between the third AC power.

[0107] In the embodiment of the present application, the isolation circuit may include multiple resistance elements connected in series and / or in parallel.

[0108] In the embodiment of the present application, an isolation circuit is provided to reduce the AC voltage, and a physical distance is established through the isolation circuit to avoid AC voltage coupling.

[0109] The present application also provides an implementation of an AC signal parameter detection circuit, for details, see the following embodiments.

[0110] Figure 6 FIG1 shows a schematic diagram of an AC voltage detection circuit provided by an embodiment of the present application. Figure 6 , the AC voltage detection circuit 600 provided in this application may include:

[0111] AC signal acquisition circuit 100;

[0112] The analog signal sampling circuit 601 has an input terminal connected to the output terminal of the AC signal acquisition circuit 100 , and an output terminal of the analog signal sampling circuit is connected to the input terminal of the processing chip 602 .

[0113] In the embodiment of the present application, the analog sampling circuit can amplify or attenuate the parameter signal output by the AC signal acquisition circuit 100, and output a stable low-voltage DC signal. It is understood that the analog sampling circuit is not limited to an operational amplifier, but can also be an arithmetic unit between an ARM or a processor, capable of processing the signal into the required signal.

[0114] In an embodiment of the present application, by connecting the AC voltage acquisition circuit with the analog signal sampling circuit, the analog signal sampling circuit can process the parameter signal collected by the AC voltage acquisition circuit, and the parameter signal can be input into the processing chip, so that the processing chip can judge the status of the power supply system based on the parameter signal, thereby avoiding failure of electrical equipment due to abnormalities in the power supply system.

[0115] In the embodiments of the present application, the AC voltage detection circuit is described with reference to the following examples.

[0116] In the embodiment of this application, Figure 7 FIG. 1 is a schematic diagram of an AC signal acquisition circuit 700 between AC phases AB provided in one embodiment of the present application. Figure 7 As shown, the AC voltage acquisition circuit between AC phases AB may include a first port 711 and a second port 712, and the first port 711 may be connected to AC phase A, and the second port 712 may be connected to AC phase B, thereby realizing the acquisition of AC signal parameters between AC phases AB.

[0117] In an embodiment of the present application, the AC voltage acquisition circuit between the AC phases AB may include an AC signal acquisition circuit 720 for acquiring the AC signal between the AC phases AB, a DC component acquisition circuit 730 for acquiring the DC component between the AC phases AB, and a phase acquisition circuit 740 for acquiring the AC signal between the AC phases AB.

[0118] In the embodiment of the present application, the AC signal acquisition circuit 720 uses AC phase A and AC phase B as input terminals, and resistors 721, 723, and 725 are connected in series at one end of AC phase A, and resistors 722, 724, and 726 are connected in series at one end of AC phase B. Furthermore, the AC signal acquisition circuit 720 further includes a capacitor 727, one end of which is connected to resistor 725 and the other end is connected to resistor 726. The voltage signal across capacitor 727 can be used as the output of the AC signal acquisition circuit 720, i.e., the AC voltage signal parameter between AC phases A and B.

[0119] In the embodiment of the present application, DC component acquisition circuit 730 uses AC phase A and AC phase B as input terminals. Resistor 731, capacitor 733, and resistor 732 are connected in series with AC phase A and AC phase B, forming a first-stage filter between the AC phases AB. Resistor 734, capacitor 736, and resistor 735 are connected in series and in parallel on both sides of capacitor 733 to implement a second-stage filter for the AC phases AB. DC component acquisition circuit 730 also includes resistors 737 and 737. The voltage signal between resistors 737 and 737 can be used as the output signal of DC component acquisition circuit 730, namely, the AC voltage signal parameter between the AC phases AB.

[0120] In the embodiment of the present application, the phase acquisition circuit 740 uses AC phase A and AC phase B as input terminals, and resistors 741 and 745 are connected in series at one end of AC phase A, while resistors 742 and 746 are connected in series at one end of AC phase B. The cathode of diode 747 is connected to resistor 745, and the anode is connected to resistor 746. Capacitor 748 is connected in parallel on both sides of diode 747. Isolation conversion circuit 749 is connected in parallel on both sides of diode 747. It can be understood that the voltage signal output by the diode powers isolation conversion circuit 749. The voltage signal output by isolation conversion circuit 749 can be used as the output of phase acquisition circuit 740, that is, the phase parameter between AC phases AB.

[0121] In the embodiment of the present application, the AC signal acquisition circuit 700 further includes a resistor 751 and a resistor 752 , wherein the resistor 751 and the resistor 752 are respectively placed between the first port and the second port and the acquisition circuit.

[0122] It should be understood that the present application is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and illustrated as examples. However, the method process of the present application is not limited to the specific steps described and illustrated. Those skilled in the art can make various changes, modifications, and additions, or change the order of the steps after understanding the spirit of the present application.

[0123] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps. In other words, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0124] Aspects of the present disclosure have been described above with reference to the flow charts and / or block diagrams of the circuits according to the embodiments of the present disclosure. It should be understood that each box in the flow charts and / or block diagrams and the combination of each box in the flow charts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flow charts and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit. It is also understood that each box in the block diagrams and / or flow charts and the combination of the boxes in the block diagrams and / or flow charts can also be implemented by dedicated hardware that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0125] The above description is only a specific embodiment of the present application. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the scope of protection of the present application.

Claims

1. An AC signal acquisition circuit, characterized in that: include: An AC signal access module, the AC signal access module comprising a first port, a second port, and a third port, wherein the first port, the second port, and the third port are respectively connected to a first phase line, a second phase line, and a third phase line of a three-phase AC power; a first voltage acquisition circuit, whose input terminals are connected to the first port and the second port respectively, so as to acquire the voltage between the first phase line and the second phase line; a second voltage acquisition circuit, whose input terminals are respectively connected to the first port and the third port to acquire the voltage between the first phase line and the third phase line; a third voltage acquisition circuit, whose input terminals are respectively connected to the second port and the third port to acquire the voltage between the second phase line and the third phase line; The first voltage acquisition circuit, the second voltage acquisition circuit and the third voltage acquisition circuit each include an AC signal acquisition circuit, a DC component acquisition circuit and a phase acquisition circuit.

2. The AC signal acquisition circuit according to claim 1, characterized in that: The AC signal acquisition circuit, the DC component acquisition circuit and the phase acquisition circuit are connected in parallel.

3. The circuit according to any one of claims 1 or 2, characterized in that The AC signal acquisition circuit of the first voltage acquisition circuit includes a first voltage dividing module connected to the first port and a second voltage dividing module connected to the second port, and the first voltage dividing module is further connected to the second voltage dividing module through a first filtering module; The AC signal acquisition circuit of the second voltage acquisition circuit includes a third voltage dividing module connected to the first port and a fourth voltage dividing module connected to the third port, and the third voltage dividing module is further connected to the fourth voltage dividing module through the second filtering module; The AC signal acquisition circuit of the third voltage acquisition circuit includes a fifth voltage dividing module connected to the second port and a sixth voltage dividing module connected to the third port. The fifth voltage dividing module is further connected to the sixth voltage dividing module through the third filtering module.

4. The circuit according to claim 3, characterized in that The first voltage dividing module includes a first resistor, which includes a plurality of resistance elements connected in series and / or in parallel; the second voltage dividing module includes a second resistor, which includes a plurality of resistance elements connected in series and / or in parallel; The AC voltage signal parameter acquisition circuit of the first voltage acquisition circuit includes a first resistor connected to the first port and a second resistor connected to the second port, and the first resistor is further connected to the second resistor via a first capacitor; The third voltage dividing module includes a third resistor, which includes a plurality of resistance elements connected in series and / or in parallel; the fourth voltage dividing module includes a fourth resistor, which includes a plurality of resistance elements connected in series and / or in parallel; The AC voltage signal parameter acquisition circuit of the second voltage acquisition circuit includes a third resistor connected to the first port and a fourth resistor connected to the third port, and the third resistor is further connected to the fourth resistor via a second capacitor; The fifth voltage dividing module includes a fifth resistor, which includes a plurality of resistance elements connected in series and / or in parallel; the sixth voltage dividing module includes a sixth resistor, which includes a plurality of resistance elements connected in series and / or in parallel; The AC voltage signal parameter acquisition circuit of the third voltage acquisition circuit includes a fifth resistor connected to the second port and a sixth resistor connected to the third port. The fifth resistor is further connected to the sixth resistor via a third capacitor.

5. The circuit according to any one of claims 1 or 2, characterized in that The DC component acquisition circuit of the first voltage acquisition circuit includes a fourth filtering module connected to the first port and the second port; The DC component acquisition circuit of the second voltage acquisition circuit includes a fifth filtering module connected to the first port and the third port; The DC component acquisition circuit of the third voltage acquisition circuit includes a sixth filtering module connected to the second port and the third port.

6. The circuit according to claim 5, characterized in that The fourth filtering module includes: one or more stages of filtering circuits; The fourth filtering module at least includes: a seventh resistor connected to the first port and an eighth resistor connected to the second port, and the seventh resistor is further connected to the eighth resistor via a fourth capacitor; The fifth filtering module includes: one or more stages of filtering circuits; The fifth filtering module at least includes: a ninth resistor connected to the first port and a tenth resistor connected to the third port, and the ninth resistor is further connected to the tenth resistor via a fifth capacitor; The sixth filtering module includes: one or more stages of filtering circuits; The sixth filtering module at least includes: an eleventh resistor connected to the second port and a twelfth resistor connected to the third port, and the eleventh resistor is further connected to the twelfth resistor via a sixth capacitor.

7. The circuit according to claim 2, characterized in that The phase acquisition circuit of the first voltage acquisition circuit includes a seventh voltage divider module connected to the first port and an eighth voltage divider module connected to the second port, the seventh voltage divider module is further connected to the eighth voltage divider module through the first rectifier module, and the seventh filter module and the first digital-to-analog conversion circuit are respectively connected in parallel with the first rectifier module; The phase acquisition circuit of the second voltage acquisition circuit includes a ninth voltage divider module connected to the first port and a tenth voltage divider module connected to the third port, the ninth voltage divider module is further connected to the tenth voltage divider module via the second rectifier module, and the eighth filtering module and the second digital-to-analog conversion circuit are respectively connected in parallel with the second rectifier module; The phase acquisition circuit of the third voltage acquisition circuit includes an eleventh voltage divider module connected to the second port and a twelfth voltage divider module connected to the third port. The eleventh voltage divider module is also connected to the twelfth voltage divider module through the third rectifier module, and the ninth filter module and the third digital-to-analog conversion circuit are respectively connected in parallel with the third rectifier module.

8. The circuit according to claim 7, characterized in that The seventh voltage dividing module includes a thirteenth resistor, which includes a plurality of resistance elements connected in series and / or in parallel. The eighth voltage dividing module includes a fourteenth resistor, which includes a plurality of resistance elements connected in series and / or in parallel. The phase parameter acquisition circuit of the first voltage acquisition circuit includes a thirteenth resistor connected to the first port and a fourteenth resistor connected to the second port, the thirteenth resistor is further connected to the fourteenth resistor via a first diode, and the seventh capacitor and the first isolation conversion circuit are respectively connected in parallel with the first diode; The ninth voltage divider module includes a fifteenth resistor, which includes a plurality of resistance elements connected in series and / or in parallel. The tenth voltage divider module includes a sixteenth resistor, which includes a plurality of resistance elements connected in series and / or in parallel. The phase parameter acquisition circuit of the second voltage acquisition circuit includes a fifteenth resistor connected to the first port and a sixteenth resistor connected to the second port, the fifteenth resistor is further connected to the sixteenth resistor via a second diode, and the eighth capacitor and the second isolation conversion circuit are respectively connected in parallel with the second diode; The eleventh voltage dividing module includes a seventeenth resistor, which includes a plurality of resistance elements connected in series and / or in parallel. The twelfth voltage dividing module includes an eighteenth resistor, which includes a plurality of resistance elements connected in series and / or in parallel. The phase parameter acquisition circuit of the third voltage acquisition circuit includes a seventeenth resistor connected to the second port and an eighteenth resistor connected to the third port. The seventeenth resistor is also connected to the eighteenth resistor through a third diode, and the ninth capacitor and the third isolation conversion circuit are respectively connected in parallel with the third diode.

9. The AC signal acquisition circuit according to claim 1, characterized in that: The AC signal acquisition circuit further includes: One or more isolation circuits, whose input ends are respectively connected to the AC signal access module and the first voltage acquisition circuit, or whose input ends are respectively connected to the AC signal access module and the second voltage acquisition circuit; or whose input ends are respectively connected to the AC signal access module and the third voltage acquisition circuit.

10. An AC signal detection circuit, characterized in that: include: An AC signal acquisition circuit, comprising the AC signal acquisition circuit according to any one of claims 1 to 9; An analog signal sampling circuit, wherein the input end of the analog signal sampling circuit is connected to the output end of the AC signal acquisition circuit, and the output end of the analog signal sampling circuit is connected to the input end of the processing chip.

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