Multiphase power supply detection system and detection method

Abstract

The invention discloses a multi-phase power supply detection system and method, and the system comprises the steps: transmitting a detection signal to a level conversion device after a detection device obtains the detection signal of an output end of each phase of power supply; the level conversion device converts the multiple detection signals obtained through detection into the multiple corresponding direct-current level signals and outputs the multiple direct-current level signals to the level detection device, then the level detection device determines whether each phase of power supply is abnormal or not according to the multiple direct-current level signals, and due to the fact that interference does not exist between the direct-current level signals, the power supply is abnormal or not. According to the utility model, the problem of inaccurate detection results caused by inter-phase interference between detection signals of the multi-phase power supply before the detection signals are transmitted to the level detection device can be avoided, so that the accuracy of online detection of the multi-phase power supply can be improved, and the product quality can be guaranteed.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of server technology, and in particular to a multi-phase power supply detection system and detection method. Background Art

[0002] InCircuitTest (ICT) is a test of the electrical performance and electrical connections of electrical components made on circuit boards. In-circuit testing mainly checks the resistance, capacitance and other basic quantities of each electrical component and the open and closed circuit conditions of each circuit to determine whether there are manufacturing defects in the circuit board and whether the electrical components are reliable. In-circuit testing is a standard test for circuit board products, which has the characteristics of simple and fast operation and accurate fault location.

[0003] Currently, the test results of the method for testing the multi-phase power supply in the circuit board based on the above ICT technology are not accurate.

[0004] Therefore, how to improve the accuracy of online testing of multi-phase power supplies is an urgent problem to be solved. Summary of the invention

[0005] The multi-phase power supply detection system and detection method provided in the embodiments of the present application can improve the accuracy of online detection of multi-phase power supplies.

[0006] In a first aspect, an embodiment of the present application provides a multi-phase power supply detection system, the multi-phase power supply detection system comprising a detection device, a level conversion device and a level detection device, the level conversion device is connected between the detection device and the level detection device, wherein:

[0007] The detection device is used to obtain a detection signal from the output end of each phase power supply in the multi-phase power supply to be tested;

[0008] The level conversion device is used to perform level conversion on the multiple detection signals of the multi-phase power supply to obtain a plurality of DC level signals corresponding to the multiple detection signals one by one, and the amplitude of the DC level signal is used to indicate the output voltage of the corresponding phase power supply;

[0009] The level detection device is used to determine the state of each phase power supply in the multi-phase power supply according to the amplitudes of the multiple DC level signals, and the state of each phase power supply includes a normal state or an abnormal state.

[0010] In the above-mentioned multi-phase power supply detection system, after the detection device obtains the detection signal of the output end of each phase power supply, the detection signal is output to the level conversion device. The level conversion device converts the multiple detection signals obtained by the detection into corresponding multiple DC level signals and outputs them to the level detection device. Then, the level detection device determines the state of each phase power supply in the multi-phase power supply according to the multiple DC level signals. Since there is no interference between the DC level signals, the problem of inaccurate detection results caused by phase-to-phase interference between the detection signals of the multi-phase power supply before being transmitted to the level detection device can be avoided, thereby improving the accuracy of online detection of the multi-phase power supply and ensuring product quality.

[0011] In some embodiments, the detection device and the input end of the level conversion device are connected via a connection line, and the length of the connection line is less than or equal to a preset length threshold.

[0012] It can be understood that the length of the connection line between the detection device and the level conversion device is set to be less than or equal to a preset length threshold, and the preset length threshold can be a smaller value, thereby shortening the distance between the detection device and the level conversion device and reducing the crosstalk noise generated by the detection signal during the transmission process.

[0013] In some embodiments, each phase power supply includes a first switch element and a second switch element, the input end of the first switch element is connected to the input end of each phase power supply, the output end of the first switch element is connected to the output end of each phase power supply, the input end of the second switch element is connected between the output end of the first switch element and the output end of each phase power supply, and the output end of the second switch element is connected to the ground, wherein:

[0014] When the state of the target phase power supply includes the abnormal state, the level detection device determines the target failure element in the target phase power supply based on the corresponding relationship between the preset failure element and the level signal, and the target DC level signal corresponding to the target phase power supply. The target failure element includes the first switching element or the second switching element, and the target phase power supply is any one phase or multiple phases of the multi-phase power supply.

[0015] It can be understood that by obtaining the correspondence between the failed component and the level signal in advance, the target failed component can be directly judged through the waveform of the target DC level signal and the correspondence during the detection process, which makes it easier for technicians to determine the cause of the abnormality of each phase of the power supply and improves detection efficiency.

[0016] In some embodiments, the level conversion device includes a plurality of level conversion units, the plurality of level conversion units correspond to the multi-phase power supply one by one, each level conversion unit includes an energy storage element and an impedance element, the input end of the impedance element is connected to the detection device, the output end of the impedance element is connected to the level detection device, the input end of the energy storage element is connected to the output end of the impedance element, and the output end of the energy storage element is connected to the ground, wherein:

[0017] The impedance element is used to receive the detection signal and output a processed detection signal according to the detection signal and a preset impedance parameter;

[0018] The energy storage element is used to receive the processed detection signal, store part of the power of the processed detection signal when the processed detection signal is at a high level, and release part of the stored power when the processed detection signal is at a low level, so that the voltage value of the DC level signal corresponding to the detection signal is stabilized within a preset voltage range.

[0019] It can be understood that the level conversion of the detection signal is realized by using an impedance element and an energy storage element, and the implementation method is relatively simple, which can reduce the complexity of the test circuit.

[0020] In some embodiments, the detection device includes a signal detector and a ground detector, the signal detector is connected to the input end of the impedance element through a first connecting line, and the ground detector is connected to the ground end of the level conversion device through a second connecting line, so that the level conversion device obtains the detection signal of the corresponding phase power supply through the first connecting line;

[0021] The level detection device includes a signal receiving end and a ground end, the signal receiving end is connected to the output end of the impedance element through a third connecting line, and the ground end of the level detection device is connected to the ground end of the level conversion device through a fourth connecting line, so that the level detection device obtains the DC level signal through the third connecting line.

[0022] It can be understood that by connecting the ground end of the detection device and the ground end of the level conversion device through the second connecting line, and connecting the ground end of the level conversion device and the ground end of the level detection device through the fourth connecting line, data errors generated during the transmission process between the detection device, the level conversion device and the level detection device can be eliminated, thereby improving the detection accuracy.

[0023] In a second aspect, a multi-phase power supply detection method provided in an embodiment of the present application is applied to a multi-phase power supply detection system, wherein the multi-phase power supply detection system includes a detection device, a level conversion device, and a level detection device, wherein the level conversion device is connected between the detection device and the level detection device, and the method includes:

[0024] Acquiring a detection signal from the output end of each phase power supply in the multi-phase power supply to be tested through the detection device;

[0025] The level conversion device performs level conversion on the multiple detection signals of the multi-phase power supply to obtain a plurality of DC level signals corresponding to the multiple detection signals one by one, wherein the amplitude of the DC level signal is used to indicate the output voltage of the corresponding phase power supply;

[0026] The level detection device determines the state of each phase power supply in the multi-phase power supply according to the amplitudes of the multiple DC level signals, and the state of each phase power supply includes a normal state or an abnormal state.

[0027] In some embodiments, the level detection device determines the state of each phase power supply in the multi-phase power supply according to the amplitudes of the multiple DC level signals, including:

[0028] Acquiring the amplitude of each DC level signal among the plurality of DC level signals through the level detection device, and determining the power supply in an abnormal state according to the difference between the amplitude of each DC level signal and a preset level value;

[0029] Among them, when the absolute value of the difference between the amplitude of the target DC level signal and the preset level value is greater than a threshold, it is determined that the power supply corresponding to the target DC level signal is the power supply in an abnormal state, and the target DC level signal is one of the multiple DC level signals.

[0030] In some embodiments, each phase power supply includes a first switch element and a second switch element, an input end of the first switch element is connected to an input end of the each phase power supply, an output end of the first switch element is connected to an output end of the each phase power supply, an input end of the second switch element is connected between an output end of the first switch element and an output end of the each phase power supply, and an output end of the second switch element is connected to a ground end, and the method further includes:

[0031] When the state of the target phase power supply includes the abnormal state, the level detection device determines the target failure element in the target phase power supply based on the corresponding relationship between the preset failure element and the level signal, and the target DC level signal corresponding to the target phase power supply. The target failure element includes the first switching element or the second switching element, and the target phase power supply is any one phase or multiple phases of the multi-phase power supply.

[0032] In some embodiments, the detection device and the input end of the level conversion device are connected via a connection line, and the length of the connection line is less than or equal to a preset length threshold.

[0033] In some embodiments, the multi-phase power supply detection system further includes an amplifier, an input end of the amplifier is connected to the level conversion device, and an output end of the amplifier is connected to the level detection device, and the method further includes:

[0034] Amplifying the plurality of DC level signals by the amplifier to obtain a plurality of amplified DC level signals;

[0035] Correspondingly, determining the state of each phase power supply in the multi-phase power supply according to the amplitudes of the plurality of DC level signals by the level detection device includes:

[0036] The state of each phase power supply in the multi-phase power supply is determined by the level detection device according to the amplitudes of the multiple amplified DC level signals.

[0037] It should be understood that the second aspect of the embodiment of the present application is consistent with the technical solution of the first aspect of the embodiment of the present application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation methods are similar and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solution of the present application.

[0039] Figure 1 A schematic diagram of the structure of a multi-phase power supply detection system provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of the structure of a multi-phase power supply provided in an embodiment of the present application;

[0041] Figure 3 One of the structural schematic diagrams of the multi-phase power supply detection system provided in an embodiment of the present application;

[0042] Figure 4A schematic diagram of a DC level signal when a multi-phase power supply fails and does not fail provided by an embodiment of the present application;

[0043] Figure 5 A schematic diagram of the structure of a level detection device provided in an embodiment of the present application;

[0044] Figure 6 One of the signal waveform diagrams before and after level conversion provided in an embodiment of the present application;

[0045] Figure 7 The second schematic diagram of the signal waveform before and after the level conversion provided in the embodiment of the present application;

[0046] Figure 8 The third schematic diagram of the signal waveform before and after the level conversion provided in the embodiment of the present application;

[0047] Fig. 9 The second structural diagram of the multi-phase power supply detection system provided in the embodiment of the present application;

[0048] Fig.10 One of the structural schematic diagrams of the level conversion unit provided in the embodiment of the present application;

[0049] Fig.11 The second structural diagram of the level conversion unit provided in the embodiment of the present application;

[0050] Fig.12 The third structural diagram of the level conversion unit provided in the embodiment of the present application;

[0051] Fig.13 A fourth structural diagram of a level conversion unit provided in an embodiment of the present application;

[0052] Fig.14 A fifth structural diagram of a level conversion unit provided in an embodiment of the present application;

[0053] Fig.15 The third structural diagram of the multi-phase power supply detection system provided in the embodiment of the present application;

[0054] Fig.16 One of the flow charts of the multi-phase power supply detection method provided in the embodiment of the present application;

[0055] Fig.17 A second flow chart of a multi-phase power supply detection method provided in an embodiment of the present application;

[0056] Fig.18 This is the fourth structural schematic diagram of the multi-phase power supply detection system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0059] It should be pointed out that the terms "first\second\third" involved in the embodiments of the present application are used to distinguish similar or different objects, and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0060] Figure 1 A schematic diagram of the system architecture of a multiphase power supply detection scenario provided in an embodiment of the present application, wherein the multiphase power supply 10 is detected by a multiphase power supply detection system 20. The multiphase power supply detection system 20 is used to detect circuit faults of the multiphase power supply to be detected to ensure that the multiphase power supply to be detected can work normally. The detailed description is as follows:

[0061] The multiphase power supply to be detected may include a multiphase power supply 10, such as a multiphase step-down conversion circuit. The multiphase power supply 10 is a power supply circuit widely used in electronic devices, and is used to provide working voltage for electronic devices. A multiphase power supply refers to a DC voltage conversion technology in which multiple voltage regulating circuits are connected in parallel to supply power. The electronic device may be a network device, a communication device, or a wireless device, wherein the network device may be a router, a server, or a switch, etc., which is not specifically limited in the embodiments of the present application.

[0062] Figure 2 A schematic diagram of the structure of a multi-phase power supply 10 provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, in the multi-phase power supply 10 provided in the embodiment of the present application, a digital controller, an output capacitor, and a multi-phase voltage regulating circuit controlled by the digital controller may be included, the digital controller is respectively connected to the control end of the multi-phase voltage regulating circuit, and the output capacitor is respectively connected to the output end of the multi-phase voltage regulating circuit. The output capacitor is used to filter the output signal of the multi-phase power supply 10 as a whole to reduce noise interference.

[0063] Each phase voltage regulation circuit in the multi-phase voltage regulation circuit includes a first switch tube, a second switch tube and an inductor. The input end of the first switch tube is connected to the input end of each phase voltage regulation voltage, the output end of the first switch tube is connected to one end of the inductor, and the other end of the inductor is connected to the output capacitor. The input end of the second switch tube is respectively connected to the output end of the first switch tube and one end of the inductor, the output end of the second switch tube is connected to the ground end, the control end of the first switch tube and the control end of the second switch tube are respectively connected to the digital controller, and the inductor is used to temporarily store electric energy in the form of a magnetic field when hindering current conversion. When the current in the circuit decreases, the inductor can release the temporarily stored energy; the first switch tube and the second switch tube are both controlled by the drive signal output by the digital controller, wherein PW1 is the drive signal of the first phase voltage regulation circuit, PW2 is the drive signal of the second phase voltage regulation circuit, and PW3 is the drive signal of the third phase voltage regulation circuit.

[0064] For example, the first phase voltage regulation circuit includes a first switch tube Q11, a second switch tube Q12 and a first phase inductor L1, the second phase voltage regulation circuit includes a first switch tube Q21, a second switch tube Q22 and a second phase inductor L2, and the Nth phase voltage regulation circuit includes a first switch tube QN1, a second switch tube QN2 and an Nth phase inductor LN. It can be understood that the driving signals of each phase voltage regulation circuit are the same, but the phases are different. For a three-phase power supply, the voltage phase difference between each phase is 120°, that is, the switching action of the second phase voltage regulation circuit should lag 120° compared to the first phase, and the switching action of the third phase voltage regulation circuit should lag 240° compared to the first phase, so as to ensure the current balance on the load and improve the system efficiency.

[0065] It should be noted that the overall output signal of the multi-phase power supply 10 is jointly regulated by each phase power supply in the multi-phase. When any phase power supply is abnormal, the overall output signal of the multi-phase power supply 10 will cause abnormality.

[0066] The multi-phase power supply detection system 20 tests the electrical performance and electrical connection of the electronic components made on the circuit board. In the embodiment of the present application, when the multi-phase power supply 10 is powered on, the multi-phase power supply detection system 20 senses the detection signal of the output end of each phase power supply, and analyzes different output signals to detect which specific phase power supply has a fault, wherein the detection signal of the output end of each phase power supply can be a detection signal at the input end of the inductance of each phase power supply, or a detection signal at the output end of the inductance of each phase power supply.

[0067] For example, in the above Figure 2When the multi-phase power supply 10 is powered on, the multi-phase power supply detection system 20 provided in the embodiment of the present application can detect whether the N-phase power supplies included in the multi-phase power supply 10 are faulty. Optionally, when any phase power supply fails, the driving of the phase power supply can be stopped, thereby isolating the phase power supply and preventing the processor in the router from failing to work properly due to the failure of the phase power supply.

[0068] Understandably, Figure 1 The multi-phase power supply detection system architecture in the embodiment of the present application is only an exemplary implementation in the embodiment of the present application. The multi-phase power supply detection system in the embodiment of the present application includes but is not limited to the above system architecture.

[0069] The embodiment of the present application provides a multi-phase power supply detection system 20, in which the detection device of the multi-phase power supply detection system detects the output signal of each phase power supply in the multi-phase power supply to be tested to obtain multiple detection signals, and then the multiple detection signals are level-converted by a level conversion device to obtain multiple DC level signals corresponding to the multiple detection signals, and then the power supply in the multi-phase power supply that is in an abnormal state is determined by the level detection device according to the multiple DC level signals. Since there is no interference between the DC level signals, the problem of inaccurate detection results caused by phase-to-phase interference between the detection signals of the multi-phase power supply 10 before being transmitted to the level detection device can be avoided, thereby improving the accuracy of online detection of the multi-phase power supply 10 and ensuring product quality.

[0070] Figure 3 Schematic diagram of a multi-phase power supply detection system 20 provided in an embodiment of the present application. Figure 3 As shown, the multi-phase power supply detection system 20 may include a detection device 201, a level conversion device 202 and a level detection device 203, wherein the input end of the detection device 201 is connected to the output end of each phase of the multi-phase power supply, the output end of the detection device 201 is connected to the input end of the level conversion device 202, and the output end of the level conversion device 202 is connected to the input end of the level detection device 203.

[0071] The detection device 201 is used to obtain a detection signal from the output end of each phase power supply in the multi-phase power supply 10 to be tested;

[0072] The level conversion device 202 is used to perform level conversion on multiple detection signals of the multi-phase power supply 10 to obtain multiple DC level signals corresponding to the multiple detection signals one by one, and the amplitude of the DC level signal is used to indicate the output voltage of the corresponding phase power supply;

[0073] The level detection device 203 is used to determine the state of each phase power supply in the multi-phase power supply according to multiple DC level signals, and the state of each phase power supply includes a normal state or an abnormal state.

[0074] Among them, since the detection device 201 is connected to the output end of each phase power supply, the detection signal obtained by the detection device 201 is the same as or similar to the actual output signal of each phase power supply, that is, the level detection device 203 detects the DC level signal corresponding to the detection signal, which is equivalent to detecting the actual output signal of each phase power supply, and then detects the state of each phase power supply to determine whether the multi-phase power supply 10 has any abnormality.

[0075] It should be understood that when a component of each phase of the multi-phase power supply 10 fails, the corresponding DC level signal will also change. For example, for a three-phase power supply, Figure 4 As shown, the switch elements in the first phase power supply are not failed, and the switch tube can switch the on-off state under the control of the digital controller. The detection signal obtained by the detection device of the multi-phase power supply detection system 20 after detecting the output signal of the first phase power supply is a square wave signal, and the DC level signal obtained after the detection signal is converted is a constant high level signal; the switch elements in the second phase power supply are not failed, and the switch tube can switch the on-off state under the control of the digital controller. The detection signal obtained by the detection device of the multi-phase power supply detection system 20 after detecting the output signal of the second phase power supply is a square wave signal, and the DC level signal obtained after the detection signal is converted is also a constant high level signal; the switch element in the third phase power supply fails, and the switch tube cannot switch the on-off state under the control of the digital controller, that is, the switch tube is always in the on state, or is always in the off state. At this time, the third phase power supply may have two output signals, one is a constant low level signal, and the other is a constant high level signal. The DC level signal obtained after the constant low level signal is converted is a constant low level signal, and the DC level signal obtained after the constant high level signal is converted is a signal that first gradually rises and then maintains at a high level. Therefore, by performing signal conversion on the output signal of each phase power supply to obtain a DC level signal, it can be determined whether the phase power supply has an abnormality.

[0076] In the embodiment of the present application, since the detection signal will first be converted in the level conversion device 202, and then converted into a DC level signal, the level detection device 203 will judge the abnormal result according to the amplitude of the DC level signal. Since the DC level signal does not have a conversion process from high level to low level, and from low level to high level, crosstalk will not occur when the DC level signal is transmitted, and noise will not be generated, thereby reducing the impact of signal crosstalk on the abnormal judgment result.

[0077] In some embodiments, the detection device 201 may be a contact sensing device or a non-contact sensing device, which is specifically configured by those skilled in the art according to actual conditions and is not limited in the embodiments of the present application.

[0078] In the case where the detection device 201 is a non-contact induction device, the detection device 201 is an induction sheet, and the induction sheet can be placed at a distance from the inductor that is less than or equal to the induction threshold corresponding to the induction sheet, and at a position that is not in contact with the inductor. When the multi-phase power supply 10 is in a working state, the electrical signal flowing through the inductor is sensed by the induction sheet, and then the detection signal corresponding to the inductor is obtained. Similarly, multiple induction sheets are respectively set at positions that are less than or equal to the induction threshold corresponding to multiple inductors in the multi-phase power supply, and are not in contact with the inductor. Multiple induction sheets correspond to multiple inductors one by one, and multiple detection signals can be obtained through multiple induction sheets. Among them, the induction sheet includes one or more of a capacitive probe and a magnetic probe. Since it is in the working state of the multi-phase power supply 10 and is the first induction signal obtained by a non-contact method, there is no need to design a test point on the multi-phase power supply 10, and there is no need for a test needle to excite an additional signal.

[0079] Among them, when the detection device 201 is connected to the inductor, the connection can be a direct connection (corresponding to a contact connection, such as a probe) or a coupled connection (corresponding to a contactless connection), forming a parallel connection between the detection device 201 and the inductor. Therefore, the amplitude of the output voltage of each phase of the power supply output at the inductor is equal to or close to the voltage amplitude of the detection signal of the detection device 201.

[0080] In some embodiments, the input ends of the detection device and the level conversion device are connected through a connecting line. Since there is no interphase interference signal between the multiple DC level signals output by the multiple level conversion devices during the transmission process, but the multiple detection signals transmitted between the detection device 201 and the level conversion device will still be affected by the interphase interference, the length of the connecting line between the detection device 201 and the level conversion device 202 can be set to be less than or equal to a preset length threshold. The smaller the value of the preset distance threshold, the better. For example, the maximum value of the preset length threshold is 2 cm. Therefore, by shortening the distance between the detection device 201 and the level conversion device 202, the crosstalk noise generated by the detection signal during the transmission process can be reduced.

[0081] In some embodiments, the detection device 201 and the level conversion device 202 may be arranged in the same integrated circuit board, so that the wire length between the detection device 201 and the level conversion device 202 can be controlled to a minimum by adjusting the distribution position of the detection device 201 and the level conversion device 202 in the circuit board.

[0082] In some embodiments, the manner of determining a power source in an abnormal state may include one or a combination of the following:

[0083] Method 1:

[0084] The level detection device 203 compares the amplitudes of the plurality of DC level signals, determines a target DC level signal that is different from other DC level signals among the plurality of DC level signals, and determines the power source corresponding to the target DC level signal as an abnormal power source.

[0085] It should be understood that when the circuit structure and device parameters of each phase power supply are the same, the amplitude of the output signal of each phase power supply in the multi-phase power supply 10 is the same, and the only difference is the phase. Therefore, when the multi-phase power supply 10 is in a normal state, the amplitude of the DC level signal corresponding to each phase power supply should be the same. Therefore, it is possible to determine whether there is an abnormality in the multi-phase power supply 10 by comparing whether there is a target DC level signal with an amplitude different from that of other DC level signals in multiple DC level signals.

[0086] Exemplarily, the multi-phase power supply 10 is a three-phase power supply, the first phase power supply is in a normal state, the output signal of this phase power supply is a square wave signal, and the corresponding DC level signal is a high level signal, the second phase power supply is in a normal state, the output signal of this phase power supply is a square wave signal, and the corresponding DC level signal is a high level signal, and the output signal of the third phase power supply is always zero, and the corresponding DC level signal is a signal that is always zero, so the DC level signal of the third phase power supply is different from the DC level signals of the other two phase power supplies, and the third phase power supply is determined to be in an abnormal state.

[0087] It can be understood that by directly comparing the amplitudes of a plurality of DC level signals, it can be concluded that a target DC level signal that is different from other DC level signals is in an abnormal state, thereby simplifying the calculation process.

[0088] The above method 1 is only applicable to the case where only a few power supplies in the multi-phase power supply 10 are abnormal. If most power supplies in the multi-phase power supply 10 are abnormal, there will be a deviation between the judgment result obtained by the above method 1 and the actual situation.

[0089] Method 2:

[0090] The level detection device 203 obtains the amplitude of each DC level signal in the plurality of DC level signals, and determines the power supply in an abnormal state according to the difference between the amplitude of each DC level signal and a preset level value;

[0091] When the absolute value of the difference between the amplitude of the target DC level signal and the preset level value is greater than a threshold, it is determined that the power supply corresponding to the target DC level signal is a power supply in an abnormal state, and the target DC level signal is one of multiple DC level signals.

[0092] It should be understood that the above-mentioned preset level value is the output voltage value of each phase power supply in a normal state, and the output voltage value in the normal state can be obtained by technicians in this field by testing the output voltage of each phase power supply of the multi-phase power supply in a normal state in advance.

[0093] It should be noted that the above-mentioned preset level value can be obtained by testing the multi-phase power supply to be tested when it is in a working state, or by testing other multi-phase power supplies from the same production batch as the multi-phase power supply to be tested. The device parameters of all multi-phase power supplies in the same production batch are the same, and the specific setting is made by technical personnel in this field according to actual conditions, and the embodiments of the present application are not limited thereto.

[0094] Among them, the above-mentioned preset level value can be a single value or a range value, which is specifically set by technical personnel in this field according to actual conditions, and is not limited in the embodiments of the present application.

[0095] In some embodiments, when the circuit structure and device parameters of each phase power supply are the same, the preset level value of each phase power supply can be the same, that is, only one preset level value is set, and by comparing the DC level signal of each phase power supply with the preset level value, it is concluded that there is an abnormal phase or multiple phases of the multi-phase power supply 10; when the circuit structure and / or device parameters of each phase power supply are different, the preset level value of each phase power supply can be different, that is, only multiple preset level values ​​are set, and the multiple preset level values ​​correspond one-to-one to the multi-phase power supply 10, and then by comparing the DC level signal of each phase power supply with the corresponding preset level value, it is concluded that there is an abnormal phase or multiple phases of the multi-phase power supply 10.

[0096] Exemplarily, the multi-phase power supply 10 is a three-phase power supply, the preset level value of each phase power supply is 3V, the amplitude of the DC level signal of the first phase power supply is 3V, the amplitude of the DC level signal of the second phase power supply is 3V, and the amplitude of the DC level signal of the third phase power supply is 5V, that is, the amplitudes of the DC level signals of the first phase power supply and the second phase power supply are the same as the preset level values, while the amplitude of the DC level signal of the third phase power supply is different from the preset level value, so the third phase power supply is an abnormal power supply.

[0097] It can be understood that, since the amplitude of each DC level signal indicates the output voltage of the corresponding phase power supply, directly comparing the amplitude of the DC level signal with the preset level value can directly determine whether the output voltage of the corresponding phase power supply is abnormal, thereby determining whether the corresponding phase power supply is abnormal, and further realizing the judgment of each phase power supply. The detection method is relatively simple and can reduce the complexity of calculation. Compared with method 1, this embodiment can more accurately judge the abnormal situation of each phase power supply.

[0098] In some embodiments, Figure 5 As shown, the level detection device 203 may include a voltage collector 2031 and a processor 2032, wherein the voltage collector 2031 is used to collect multiple voltage values ​​of each DC level signal at multiple collection times, and the processor 2032 is used to determine whether the power supply corresponding to each DC level signal is in an abnormal state based on the multiple voltage values.

[0099] In some embodiments, the voltage collector 2031 may be a commonly used voltage collection device in the related art, such as an analog to digital converter (ADC), which is not limited in the embodiments of the present application.

[0100] In some other embodiments, the voltage collector 2031 may also be a DC voltmeter, thereby receiving the DC level signal transmitted by the level conversion device 202 through the DC voltmeter, calculating the voltage amplitude of the DC level signal, and directly outputting the specific voltage value to the processor 2032.

[0101] It is understandable that, since the DC voltmeter is a commonly used voltage detection means in the field and has a low cost, directly obtaining the amplitude of the DC level signal through the DC voltmeter in the level detection device can simplify the detection process of the amplitude of the DC level signal and reduce the device cost. In addition, compared with voltage acquisition devices such as ADC, the DC voltmeter can directly obtain the specific value of the voltage amplitude, omitting the calculation process of the voltage amplitude by the processor 2032, thereby improving the detection efficiency.

[0102] In some embodiments, the level detection device 203 is further configured to:

[0103] When the state of the target phase power supply includes the abnormal state, the target failure element of the power supply in the abnormal state is determined according to the corresponding relationship between the preset failure element and the level signal, and the target DC level signal corresponding to the power supply in the abnormal state, and the target failure element includes the first switching element or the second switching element.

[0104] The control process of the controller controlling the first switch element to be in the on state and the second switch element to be periodically turned on and off can be controlled according to the test strategy of the multi-phase power supply detection system 20, such as starting, pausing or ending the control process of the controller. In the actual detection process, after connecting the multi-phase power supply detection system 20 to the controller of the multi-phase power supply, the user triggers the control instruction for the multi-phase power supply detection system 20 to start the detection process of the multi-phase power supply 10, and then the multi-phase power supply detection system 20 will generate and send a control signal to the controller of the multi-phase power supply 10, so that the controller of the multi-phase power supply 10 controls the on state or the off state of the first switch element and the second switch element according to the corresponding control logic, wherein the device that generates the control signal in the multi-phase power supply detection system 20 can be any processor in the multi-phase power supply detection system 20, for example, Figure 5 The processor 2032 of the level detection device 203 is specifically configured by those skilled in the art according to actual conditions, and is not limited in the embodiment of the present application.

[0105] It should be understood that the multi-phase power supply 10 includes a two-phase or more power supply and a controller, each phase power supply includes a first switching element, a second switching element and an inductor, one end of the first switching element is connected to the input end of the inductor, and the other end is connected to the input end of the multi-phase power supply 10, such as Figure 2 The first switches Q11, Q21 and QN1 shown in the figure, one end of the second switch element is connected to the ground, and the other end is connected between the first switch element and the inductor, as shown in the figure Figure 2 The second switches Q12, Q22 and QN2 shown in the figure, and the controller in the multi-phase power supply 10 is connected to the control end of the first switch element and the control end of the second switch element respectively. Under the control of the controller, the first switch element makes the target phase power supply in a working state or a non-working state, that is, when the controller controls the first switch element to be in a conducting state, the input voltage of the multi-phase power supply 10 can flow through the target phase power supply, so that the target phase power supply is in a working state; when the first switch element is in a disconnected state, the input voltage of the multi-phase power supply 10 cannot flow through the target phase power supply, so that the target phase power supply is in a non-working state. Under the control of the controller, the second switch element makes the output signal of the target phase power supply change, that is, when the second switch element is in a conducting state, the input signal of the target phase power supply all flows to the ground end, and the voltage value of the detection signal obtained by the detection device 201 is zero; when the second switch element is in a disconnected state, the electrical signal on the target phase power supply all flows to the inductor, so that the detection device 201 in contact with the input end of the inductor can obtain the detection signal, and the detection signal can indicate the output voltage of the target phase power supply.

[0106] When the multi-phase power supply 10 is in a normal state, the first switch element of each phase power supply is always in an on state, and the second switch element is periodically switched on and off under the control of the controller, so the output signal of each phase power supply is a square wave signal. Since the detection signal has the same frequency as the output signal of the target phase power supply, and the signal amplitude is equal or similar, part of the electric quantity of the high level part of the square wave signal can be transferred to the low level part during the process of converting the detection signal into a DC level signal by the level conversion device 202, so that a DC level signal with a constant voltage can be obtained. The signal waveforms before and after the level conversion are as shown in FIG. Figure 6 shown.

[0107] When a phase power supply is in an abnormal state, that is, the first switch element or the second switch element cannot work normally, there are two possible situations:

[0108] Case 1: The first switching element cannot work normally.

[0109] If the first switch element cannot be in the on state, that is, the first switch element is always in the off state, that is, the input signal of the multi-phase power supply 10 cannot flow into the current phase power supply, that is, the detection signal detected by the detection device 201 is always at a low level, and the DC level signal output by the level conversion device 202 is also always at a low level. The signal waveforms before and after the level conversion are as follows: Figure 7 shown.

[0110] Case 2: The second switch element cannot work normally.

[0111] If the second switch element cannot be normally turned on and off periodically, that is, the second switch element is always in the on state, or the second switch element is always in the off state. In the case where the second switch element is always in the on state, the input signal of the multi-phase power supply 10 always flows to the ground terminal and cannot flow into the inductor. Therefore, the detection signal detected by the detection device 201 is always at a low level, and the DC level signal output by the level conversion device 202 is also always at a low level. The signal waveforms before and after the level conversion are as shown in FIG. Figure 8 shown.

[0112] When the second switch element is always in the off state, the input signal of the multi-phase power supply 10 always flows to the inductor, so the detection signal detected by the detection device 201 is always a high-level signal. In the process of converting the detection signal into a DC level signal by the level conversion device 202, since there is no low-level part in the detection signal, the level signal will first be in a gradual rising process during the level conversion of the level conversion device 202, and then maintain at the voltage amplitude after reaching the same or similar amplitude as the detection signal. The signal waveforms before and after the level conversion are as shown in FIG. Figure 8 shown.

[0113] In summary, technicians can determine the target failure element of the power supply in an abnormal state based on the specific waveform of the target DC level signal, that is, when the target DC level signal is always a low level signal, the failure element may include the first switching element or the second switching element; when the target DC level signal is a signal trend that first gradually rises and then remains constant, the failure element may include the second switching element, thereby setting the corresponding relationship between the failure element and the level signal.

[0114] It can be understood that by obtaining the correspondence between the failed element and the level signal in advance, the multi-phase power supply detection system 20 can directly determine the target failed element through the waveform of the target DC level signal and the correspondence, which makes it convenient for technicians to determine the cause of the abnormality of each phase of the power supply.

[0115] In some embodiments, Fig. 9 As shown, the level conversion device 202 includes a plurality of level conversion units, and the plurality of level conversion units correspond to the multi-phase power supply 10 one by one. Each level conversion unit includes an energy storage element and an impedance element. The energy storage element is respectively connected to the input end of the level conversion unit, the output end of the level conversion unit and the impedance element. The impedance element is also connected to the output end of the level conversion unit.

[0116] An impedance element, used for receiving a detection signal and outputting a processed detection signal according to the detection signal and a preset impedance parameter;

[0117] The energy storage element is used to receive the processed detection signal, store part of the power of the processed detection signal when the processed detection signal is at a high level, and release part of the stored power when the processed detection signal is at a low level, so that the voltage value of the DC level signal corresponding to the detection signal is stabilized within a preset voltage range.

[0118] It should be understood that the output signal of each phase power supply is formed by the periodic on-off of the second switch element, that is, the detection signal output after the output signal of each phase power supply is detected is a square wave signal, such as Figure 6 As shown, in order to realize the conversion from the square wave signal to the DC level signal, an energy storage element is required, and the energy storage element stores part of the electricity of the square wave signal when it is at a high level, and then releases part of the stored electricity when the square wave signal is at a low level, so that the converted signal is a DC level signal with a constant voltage. In some embodiments, the energy storage element can be a capacitor and an inductor, etc., and the impedance element can be a resistor and a diode, etc., which are specifically set by those skilled in the art according to actual conditions, and the embodiments of the present application are not limited.

[0119] In some embodiments, the level conversion unit may be an RC filter circuit, an LC filter circuit, a DC chopper circuit, etc. When the level conversion unit is an RC filter circuit, the detection signal is subjected to impedance processing through a resistor, and the processed detection signal is stored in energy through a capacitor; when the level conversion unit is an LC filter circuit, the detection signal is subjected to impedance processing through an inductor, and the processed detection signal is sequentially stored in energy through a capacitor; when the level conversion unit is a DC chopper circuit, the detection signal is sequentially processed through an inductor and a resistor, and the energy storage element is to store energy through a capacitor for the processed detection signal.

[0120] For example, Fig.10 As shown, taking the level conversion unit as an RC filter circuit as an example, the energy storage element includes a first capacitor C1, the impedance element includes a first resistor R1, one end of the first resistor R1 is connected to the input end of the level conversion unit, the other end of the first resistor R1 is connected to the output end of the level conversion unit, one end of the first capacitor C1 is connected between the other end of the first resistor R1 and the output end of the level conversion unit, and the other end of the first capacitor C1 is connected to the ground. During the implementation process, the detection signal first passes through the first resistor R1, and the detection signal after voltage division by the first resistor R1 is output. Because one end of the first capacitor C1 is connected between the other end of the first resistor R1 and the output end of the level conversion unit, when the detection signal is at a high level, a part of the detection signal after voltage division by the first resistor R1 will flow into the first capacitor C1, and the other part will flow into the output end of the level conversion unit, so that the output end of the level conversion unit presents a voltage with a certain amplitude; when the detection signal is at a low level, part of the charge stored in the first capacitor C1 will be input to the output end of the level conversion unit, so that the output end of the level conversion unit presents a voltage with a certain amplitude, and the amplitude of the DC level signal when the detection signal is at a low level is equal to or close to the amplitude of the DC level signal when the detection signal is at a high level, thereby completing the conversion from the detection signal with a square wave waveform to the DC level signal.

[0121] For example, Fig.11As shown, taking the level conversion unit as an LC filter circuit as an example, the energy storage element includes a second capacitor C2, the impedance element includes a first inductor L1, one end of the first inductor L1 is connected to the input end of the level conversion unit, the other end of the first inductor L1 is connected to the output end of the level conversion unit, one end of the second capacitor C2 is connected between the other end of the first inductor L1 and the output end of the level conversion unit, and the other end of the second capacitor C2 is connected to the ground. During the implementation process, the detection signal first passes through the first inductor L1, and the detection signal after voltage division by the first inductor L1 is output. Part of the detection signal is also stored in the process of voltage division by the first inductor L1. Because one end of the second capacitor C2 is connected between the other end of the first inductor L1 and the output end of the level conversion unit, when the detection signal is at a high level, part of the detection signal after voltage division by the first inductor L1 will flow into the second capacitor C2, and the other part will flow into the output end of the level conversion unit, so that the output end of the level conversion unit presents a voltage with a certain amplitude; when the detection signal is at a low level, part of the charge stored in the second capacitor C2 and the first inductor L1 will be input to the output end of the level conversion unit, so that the output end of the level conversion unit presents a voltage with a certain amplitude, and the amplitude of the DC level signal when the detection signal is at a low level is equal to or close to the amplitude of the DC level signal when the detection signal is at a high level, thereby completing the conversion from the detection signal with a square wave waveform to the DC level signal.

[0122] For example, Fig.12 As shown, taking the level conversion unit as a DC chopper circuit as an example, the energy storage element includes a third capacitor C3, the impedance element includes a second inductor L2 and a second resistor R2, in addition to the energy storage element and the impedance element, the DC chopper circuit also includes a switch element Q1 and a unidirectional conductive element, and the level conversion unit realizes the conversion from the detection signal with a square wave waveform to a DC level signal by controlling the on-duty ratio of the switch element Q1. One end of the second inductor L2 is connected to the input end of the level conversion unit, the other end of the second inductor L2 is connected to one end of the second resistor R2 through the unidirectional conductive element, the other end of the second resistor R2 is connected to the output end of the level conversion unit, one end of the third capacitor C3 is connected between the unidirectional conductive element and the output end of the level conversion unit, the other end of the third capacitor C3 is connected to the ground, the input end of the switch element Q1 is connected between the other end of the second inductor L2 and the unidirectional conductive element, and the output end of the switch element Q1 is connected between the other end of the third capacitor C3 and the ground.

[0123] During the implementation process, the level conversion unit controls the on-off timing of the switch element to be consistent with the on-off timing of the second switch element of the multi-phase power supply current, that is, when the detection signal is at a high level, the level conversion unit controls the switch element Q1 to be turned off, so that a part of the detection signal can flow into the third capacitor C3, and the other part flows into the output end of the level conversion unit, so that the output end presents a DC level signal; when the detection signal is at a low level, the level conversion unit controls the switch element Q1 to be turned on, so that the signal at the input end all flows into the ground end, and part of the electricity stored in the third capacitor C3 is output to the output end of the level conversion unit through the second resistor R2. At the same time, because a unidirectional conductive element is provided between the switch element and the third capacitor C3, part of the electricity stored in the third capacitor C3 will not be transmitted to the ground end, so that the output end presents a DC level signal, and the amplitude of the DC level signal when the detection signal is at a low level is equal to or similar to the amplitude of the DC level signal when the detection signal is at a high level.

[0124] Among them, when the signal conversion is performed through the RC filtering circuit or the LC filtering circuit, the conversion time of the output signal cannot be consistent with the conversion time of the input signal, and has a certain hysteresis and cannot respond in time. However, when the signal conversion is performed through the DC chopper circuit, the charge storage state and charge release state of the energy storage element can be accurately controlled by the switching element, so the conversion time of the output signal can be guaranteed to be consistent with the conversion time of the input signal.

[0125] It should be noted that Fig.10 , Fig.11 and Fig.12 The level conversion unit includes only one filter circuit, and the level conversion unit may also include at least two filter circuits, each filter circuit includes an energy storage element and an impedance element, and at least two filter circuits may be connected in series or in parallel. The specific setting is made by those skilled in the art according to actual conditions, and the embodiments of the present application are not limited thereto.

[0126] For example, Fig.13 As shown, taking the example that the level conversion unit includes two filter circuits connected in series, and the filter circuit is an RC filter circuit, the energy storage element of the level conversion unit includes a fourth capacitor C4 and a fifth capacitor C5, the impedance element includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to the input end of the level conversion unit, the other end of the third resistor R3 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the output end of the level conversion unit, one end of the fourth capacitor C4 is connected between the third resistor R3 and the fourth resistor R4, the other end of the fourth capacitor C4 is connected to the ground, one end of the fifth capacitor C5 is connected between the fourth resistor R4 and the output end of the level conversion unit, and the other end of the fifth capacitor C5 is connected to the ground.

[0127] During the implementation process, the detection signal first passes through the third resistor R3, and the detection signal after voltage division by the third resistor R3 is output. Since one end of the fourth capacitor C4 is connected between the third resistor R3 and the fourth resistor R4, when the detection signal is at a high level, a part of the detection signal after voltage division by the third resistor R3 will flow into the fourth capacitor C4, and the other part will flow into the fourth resistor R4 for voltage division. A part of the detection signal after voltage division by the fourth resistor R4 will also be diverted into the fifth capacitor C5, and the other part will be output through the output end of the level conversion unit, so that the output end of the level conversion unit presents a voltage with a certain amplitude.

[0128] When the detection signal is at a low level, part of the charge stored in the fourth capacitor C4 is input to the output end of the level conversion unit through the fourth resistor R4, and part of the charge stored in the fifth capacitor C5 is also input to the output end of the level conversion unit, so that the output end of the level conversion unit presents a voltage with a certain amplitude, and the amplitude of the DC level signal when the detection signal is at a low level is equal to or close to the amplitude of the DC level signal when the detection signal is at a high level, thereby completing the conversion from the detection signal with a square wave waveform to the DC level signal.

[0129] However, since the detection signal in this embodiment is divided twice by the third resistor R3 and the fourth resistor R4, compared with the case of one filter circuit, the voltage of the detection signal in this embodiment has a higher suppression effect, and can be applied to the detection scenario where the voltage amplitude of the detection signal is greater than the voltage detection threshold of the level detection device.

[0130] For example, Fig.14 As shown, taking the case where the level conversion unit includes two filter circuits connected in parallel, and the filter circuit is an RC filter circuit as an example, the energy storage element of the level conversion unit includes a sixth capacitor C6 and a seventh capacitor C7, the impedance element includes a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected to the input end of the level conversion unit, the other end of the fifth resistor R5 is connected to the output end of the level conversion unit, one end of the sixth capacitor C6 is connected between the other end of the fifth resistor R5 and the output end of the level conversion unit, the other end of the sixth capacitor C6 is connected to the ground, one end of the sixth resistor R6 is connected to the input end of the level conversion unit, the other end of the sixth resistor R6 is connected to the output end of the level conversion unit, one end of the seventh capacitor C7 is connected between the other end of the sixth resistor R6 and the output end of the level conversion unit, and the other end of the seventh capacitor C7 is connected to the ground.

[0131] During the implementation process, after entering the level conversion unit, the detection signal will be divided into two parts. The first part of the detection signal passes through the fifth resistor R5, and the detection signal after the voltage division by the fifth resistor R5 is output. When the detection signal is at a high level, a part of the detection signal after the voltage division by the fifth resistor R5 will flow into the sixth capacitor C6, and the other part will be output through the output end of the level conversion unit; the second part of the detection signal passes through the sixth resistor R6, and the detection signal after the voltage division by the sixth resistor R6 is output. When the detection signal is at a high level, a part of the detection signal after the voltage division by the sixth resistor R6 will flow into the seventh capacitor C7, and the other part will be output through the output end of the level conversion unit, so that the output end of the level conversion unit presents a voltage with a certain amplitude due to the detection signal after the voltage division by the fifth resistor R5 and the detection signal after the voltage division by the sixth resistor R6.

[0132] When the detection signal is at a low level, part of the charge stored in the sixth capacitor C6 is input to the output end of the level conversion unit, and part of the charge stored in the seventh capacitor C7 is also input to the output end of the level conversion unit, so that the output end of the level conversion unit presents a voltage with a certain amplitude, and the amplitude of the DC level signal when the detection signal is at a low level is equal to or close to the amplitude of the DC level signal when the detection signal is at a high level, thereby completing the conversion from the detection signal with a square wave waveform to the DC level signal.

[0133] Compared with the level conversion unit in the case of two filter circuits connected in series, the detection signal in this embodiment will first be divided into two parts, and then the two parts of the detection signal will be level converted respectively through the two filter circuits connected in parallel. Therefore, the value of the device parameter of the energy storage element in each filter circuit does not need to be set too high, reducing the device cost.

[0134] In order to achieve the conversion from a square wave signal to a DC level signal, the maximum charge storage capacity of the energy storage element and the impedance coefficient of the impedance element need to be calculated so that the energy storage element can store part of the electricity when the output signal is at a high level, and this part of the electricity is exactly equal to the voltage amplitude of the level signal output by the impedance element, so that the signal output by the level conversion unit is a DC level signal with a constant voltage.

[0135] When calculating the impedance parameter R of the impedance element and the energy storage parameter C of the energy storage element, it is necessary to first obtain the signal expression A of the detection signal:

[0136]

[0137] Where T is the period of the detection signal. N is the number of count pulses in one period of the detection signal. n is the number of high-level count pulses in one period of the detection signal. VH and VL are the high and low level voltage values ​​of the detection signal, respectively, k is the harmonic order, and t is time. After Fourier transforming the above signal expression, the following formula B can be obtained:

[0138]

[0139] It can be seen from the above formula B that the formula is divided into three terms according to the plus sign, the first term is the DC component, the second term is the 1st harmonic component, and the third term is the higher harmonic component greater than the 1st. The DC component in formula B is linearly related to n, and as n changes from 0 to N, the DC component changes from VL to VL+VH. This is exactly what the voltage output DAC needs. Therefore, if the harmonics except the DC component in the above formula B can be filtered out, the conversion from the square wave signal to the DC level signal can be obtained, that is, the detection signal can be demodulated by a low-pass filter. The amplitude and phase angle of the second term in the above formula B are related to n, and the frequency is 1 / (NT), which is actually the output frequency of the detection signal. This frequency is the basis for designing the impedance parameter R and the energy storage parameter C. If the 1st harmonic can be filtered out well, the higher harmonics should basically not exist, thereby achieving the purpose of retaining only the DC component.

[0140] Assuming VH is 3.3V, VL is 0V, N is 256, and the influence of the first harmonic on the output voltage is required not to exceed the accuracy of 1 bit, that is, 3.3 / 256=0.01289V, the maximum value of the first harmonic is 2*3.3 / π=2.1V, then the level conversion unit must provide at least -20lg(2.1 / 0.01289)=-44dB attenuation. If the level conversion unit includes only one filter circuit, then the cutoff frequency Fs is calculated by -10*log[(1+F / Fs)^2]=-63dB, and Fs=14Hz; if the level conversion unit includes two filter circuits, then the cutoff frequency Fs is calculated by -20*log[(1+F / Fs)^2]=-44dB, and Fs=3723Hz, and then the impedance value R of the impedance element and the capacitance value C of the energy storage element are calculated by the cutoff frequency.

[0141] Take the level conversion unit including two energy storage units and two impedance units as an example, that is, the level conversion unit constitutes a second-order low-pass filter. The value of RC can be obtained through the formula Fs=1 / 2πRC between the cut-off frequency Fs, the impedance value R and the capacitance C under the second-order low-pass filter. Then, the technicians can determine the values ​​of R and C respectively according to the actual application. However, R or C cannot be too small, because when R is very large, C must be very small. This is due to the parasitic effect of the filter circuit, which causes the final equivalent capacitance to increase in proportion, which will affect the signal conversion effect, and vice versa.

[0142] It can be understood that the level conversion unit can realize signal conversion from the output signal to the DC level signal through the energy storage element and the level amplitude of the processed detection signal, and realize the level conversion of the detection signal through the impedance element and the energy storage element. The implementation method is relatively simple and can reduce the complexity of the test circuit.

[0143] Typically, the detection device 201 includes a signal detector and a ground detector. The signal detector is connected to the inductor, and the ground detector is connected to the ground terminal in the multi-phase power supply 10 to obtain a detection signal for the inductor. In order to ensure that the DC level signal obtained by the level detection device does not deviate from the voltage amplitude of the detection signal obtained by the detection device 201, the level detection device and the detection device 201 can be set to share the same ground, that is, the ground detector of the detection device 201 is connected to the ground terminal of the level conversion device, and the ground terminal of the level conversion device is connected to the ground terminal of the level detection device.

[0144] That is, in some embodiments, one end of the signal detector of the detection device 201 is connected to the output end of each phase power supply, and the other end of the signal detector is connected to the input end of the impedance element through the first connecting line, and one end of the grounding detector of the detection device 201 is connected to the ground end of each phase power supply, and the other end of the grounding detector is connected to the ground end of the level conversion device 202 through the second connecting line, so that the level conversion device 202 obtains the detection signal of the corresponding phase power supply through the first connecting line;

[0145] The level detection device 203 includes a signal receiving end and a ground end. The signal receiving end is connected to the output end of the impedance element through a third connecting line. The ground end of the level detection device is connected to the ground end of the level conversion device through a fourth connecting line, so that the level detection device 203 obtains a DC level signal through the third connecting line.

[0146] In some embodiments, Fig.15 As shown, the multi-phase power supply detection system further includes an amplifier 204, the input end of the amplifier 204 is connected to the level conversion device 202, and the output end of the amplifier 204 is connected to the level detection device 203, and the method further includes:

[0147] Amplifying the plurality of DC level signals by the amplifier 204 to obtain a plurality of amplified DC level signals;

[0148] Accordingly, the level detection device 203 determines the power supply in the multi-phase power supply that is in an abnormal state according to the amplitudes of the plurality of DC level signals, including:

[0149] The power source in the multi-phase power source that is in an abnormal state is determined according to the amplitudes of the plurality of amplified DC level signals by the level detection device 203 .

[0150] It should be understood that, since the signal may be attenuated before the frequency analysis is performed on the signal, which will affect the result of the signal conversion, a high-bandwidth, high-slew rate operational amplifier and a high-precision resistor can be used to amplify the signal to enhance the signal drive, so that the signal has a strong anti-interference ability, thereby improving the signal quality. For example, a high-bandwidth, high-slew rate operational amplifier and a high-precision resistor can be used to amplify the signal by more than two times, that is, the signal drive is enhanced.

[0151] In some embodiments, the number of the amplifiers 204 may be single or multiple, which is specifically set by those skilled in the art according to actual conditions and is not limited in the embodiments of the present application.

[0152] When the number of amplifiers 204 is only one, the amplifier 204 includes multiple input terminals and multiple output terminals, the multiple input terminals are connected to the multiple level conversion units in a one-to-one correspondence, and the multiple input terminals and the multiple output terminals correspond to each other. After the multiple level conversion units respectively transmit the multiple DC level signals to the amplifier 204, the amplifier 204 respectively amplifies the multiple DC level signals, and finally outputs the amplified DC level signals to the level detection device 203 through the corresponding output terminals, thereby completing the amplification of the multiple DC level signals.

[0153] When there are multiple amplifiers 204, the multiple amplifiers 204 are connected to the multiple level conversion units in a one-to-one correspondence. After the multiple level conversion units respectively transmit the multiple DC level signals to the corresponding amplifiers 204, the multiple amplifiers 204 respectively amplify the multiple DC level signals. Finally, each amplifier 204 outputs the amplified DC level signal to the level detection device 203, thereby completing the amplification of the multiple DC level signals.

[0154] in, Fig.15 The structural diagram of the multi-phase power supply detection system shown is a diagram illustrating the case where the number of amplifiers 204 is single, which is only an example of this embodiment and should not be used as a limitation on the embodiments of the present application.

[0155] It is understandable that by amplifying the signal before being transmitted to the level conversion device 202 through the amplifier 204, the signal drive can be enhanced, so that the signal has a stronger anti-interference ability, thereby improving the signal quality and further improving the accuracy of the detection result.

[0156] Fig.16 The flowchart of a multi-phase power supply detection method provided in the embodiment of the present application is applied to the multi-phase power supply detection system 20. Fig.16 As shown, the method may include the following S101 to S103:

[0157] S101, obtaining a detection signal from the output end of each phase of a multi-phase power supply to be tested through the detection device 201, and the multi-phase power supply to be tested is in a working state;

[0158] S102, performing level conversion on the multiple detection signals by the level conversion device 202 to obtain multiple DC level signals corresponding to the multiple detection signals one by one, wherein the amplitude of the DC level signal is used to indicate the output voltage of the corresponding phase power supply;

[0159] S103, determining the state of each phase power supply in the multi-phase power supply according to the amplitudes of the plurality of DC level signals by the level detection device 203, wherein the state of each phase power supply includes a normal state or an abnormal state.

[0160] In some embodiments, the above S103 may include:

[0161] The level detection device is used to obtain the amplitude of each DC level signal among the plurality of DC level signals, and the power supply in an abnormal state is determined according to the difference between the amplitude of each DC level signal and a preset level value;

[0162] When the absolute value of the difference between the amplitude of the target DC level signal and the preset level value is greater than a threshold, it is determined that the power supply corresponding to the target DC level signal is a power supply in an abnormal state, and the target DC level signal is one of multiple DC level signals.

[0163] In some embodiments, each phase power supply includes a first switch element and a second switch element, an input end of the first switch element is connected to an input end of each phase power supply, an output end of the first switch element is connected to an output end of each phase power supply, an input end of the second switch element is connected between an output end of the first switch element and an output end of each phase power supply, and an output end of the second switch element is connected to a ground end, and the method further includes the following S104:

[0164] S104, when the state of the target phase power supply includes an abnormal state, the target failure element in the target phase power supply is determined by the level detection device according to the corresponding relationship between the preset failure element and the level signal, and the target DC level signal corresponding to the target phase power supply, the target failure element includes the first switching element or the second switching element, and the target phase power supply is any one phase or multiple phases in the multi-phase power supply.

[0165] In some embodiments, the detection device and the input end of the level conversion device are connected via a connection line, and the length of the connection line is less than or equal to a preset length threshold.

[0166] In some embodiments, the multi-phase power supply detection system further includes an amplifier, an input end of the amplifier is connected to the level conversion device, and an output end of the amplifier is connected to the level detection device. The method further includes the following S105:

[0167] S105, amplifying the plurality of DC level signals by an amplifier to obtain a plurality of amplified DC level signals;

[0168] Accordingly, the above S103 may include:

[0169] The state of each phase power supply in the multi-phase power supply is determined by the level detection device according to the amplitude of the plurality of amplified DC level signals.

[0170] In some embodiments, Fig.17 As shown, the multi-phase power supply detection system 20 may further include a processor, and the above method may further include the following S106:

[0171] S106, sending a test instruction to the multi-phase power supply to be tested through the processor, where the test instruction is used to control the multi-phase power supply to be tested to be in a working state.

[0172] It should be understood that before the multi-phase power supply is tested using the multi-phase power supply detection system 20, it cannot be guaranteed that the multi-phase power supply is in a working state. Therefore, before the multi-phase power supply is tested by the detection device 201, a test instruction needs to be sent to the multi-phase power supply to be tested to control the multi-phase power supply to be tested to be in a working state, so that each phase power supply has an output signal output.

[0173] The test instruction may include a working sequence for controlling the multi-phase power supply to be tested to be in a working state, so as to control the multi-phase power supply to be tested to perform work according to the working sequence in the test instruction. The working sequence may include an on-off sequence of a first switching element and a second switching element of each phase power supply in the multi-phase power supply, so that the multi-phase power supply to be tested performs work according to the working sequence indicated by the multi-phase power supply detection system 20.

[0174] The multi-phase power supply detection system 20 and the multi-phase power supply to be tested can be transmitted via wired communication or wireless communication, which is specifically configured by technicians in this field according to actual conditions and is not limited in the embodiments of the present application.

[0175] In the case where the multi-phase power supply detection system 20 and the multi-phase power supply to be tested can be transmitted by wireless communication, the multi-phase power supply detection system 20 is provided with a first wireless communication module, and the multi-phase power supply to be tested is provided with a second wireless communication module, and the first wireless communication module and the second wireless communication module communicate with each other by a target communication method, such as Bluetooth, Zigbee, and wireless fidelity technology. After generating a test instruction, the processor sends the test instruction to the multi-phase power supply to be tested through the first wireless communication module, and the multi-phase power supply to be tested receives the test instruction through the second wireless communication module.

[0176] In the case where the multi-phase power supply detection system 20 and the multi-phase power supply to be tested can be transmitted through wired communication, the multi-phase power supply detection system 20 and the multi-phase power supply to be tested are connected through a communication cable, and the communication cable includes a data transmission line and a clock transmission line. The clock transmission line is used to transmit a clock signal to synchronize the communication timing between the multi-phase power supply detection system 20 and the multi-phase power supply to be tested; the data transmission line is used to transmit communication data to enable the multi-phase power supply detection system 20 to send test instructions to the multi-phase power supply to be tested.

[0177] In some embodiments, the processor that sends the test instruction to the multi-phase power supply may be the processor 2032 in the level detection device 203 , thereby reducing the number of processors and lowering the device cost of the multi-phase power supply detection system 20 .

[0178] It is understandable that by sending a test instruction to the multi-phase power supply to be tested by the processor, the multi-phase power supply to be tested can be controlled to be in a working state, so that the detection device 201 can obtain the output signal of each phase power supply.

[0179] In some embodiments, the multi-phase power supply detection system 20 may send a test instruction to the multi-phase power supply to be tested through a processor, for example:

[0180] The processor sends a test instruction to the controller of the multi-phase power supply to be tested based on the target timing, so that the multi-phase power supply to be tested receives the test instruction based on the target communication mode, and the target timing is consistent with the communication timing of the multi-phase power supply to be tested working in the target communication mode.

[0181] It should be understood that because the multi-phase power supply detection system 20 and the multi-phase power supply are not produced in conjunction with each other during production, there are differences in the communication methods between the multi-phase power supply detection system 20 and the multi-phase power supply. However, in order to ensure that the test instructions sent by the multi-phase power supply detection system 20 to the multi-phase power supply can be received by the multi-phase power supply, the multi-phase power supply detection system 20 needs to ensure that the sending timing of the test instructions is consistent with the communication timing of the multi-phase power supply when sending the test instructions, so that the multi-phase power supply can receive the test instructions through the target communication method.

[0182] The above-mentioned target timing can be a communication timing of a wireless communication method or a communication timing of a wired communication method. It is specifically set by technical personnel in this field according to actual conditions, and the embodiments of this application do not limit it.

[0183] It can be understood that when the processor sends a test instruction to the controller of a multi-phase power supply, it can set a target timing that is consistent with the communication timing of the multi-phase power supply to be tested operating in the target communication mode, so that the multi-phase power supply to be tested can receive the test instruction and operate normally.

[0184] Fig.18 A schematic diagram of the structure of a multi-phase power supply detection system provided in an embodiment of the present application. Fig.18 and Figure 3 As shown, the multi-phase power supply detection system 20 may include a test fixture, a detection device 201, a level conversion device 202 and a level detection device 203, the target position of the test fixture is used to set the multi-phase power supply to be tested, the detection device 201 includes a signal detector and a ground detector, the level conversion device 202 includes an RC filter circuit, one end of the signal detector is connected to the output end of each phase power supply of the multi-phase power supply 10, the other end of the signal detector is connected to the input end of the RC filter circuit, one end of the ground detector is connected to the ground end of each phase power supply, and the other end of the ground detector is connected to the ground end of the RC filter circuit. The output end of the RC filter circuit is connected to the signal receiving end of the level detection device, and the ground end of the RC filter circuit is connected to the ground end of the level detection device. The level detection device 203 and the multi-phase power supply 10 are also connected through a communication cable, and the communication cable realizes IIC (Inter-Integrated Circuit, integrated circuit bus) communication between the test fixture and the multi-phase power supply.

[0185] In some embodiments, the test fixture and the level conversion device 202 may be separated from each other or fixedly connected, which is specifically configured by those skilled in the art according to actual conditions and is not limited in this embodiment.

[0186] In some embodiments, the level conversion device is detachably connected to the detection device and the level detection device, so that different types of level conversion devices can be replaced according to actual needs.

[0187] It can be understood that the test fixture and the level detection device 203 are fixedly connected, and the test fixture is used to fix the distance between the multi-phase power supply 10 and the multi-phase power supply detection system 20. In addition, since the distance between the detection device 201 and the multi-phase power supply 10 is also limited accordingly, technicians in this field need to set the length of the connecting line between the level conversion device and the detection device to be less than a preset length threshold, such as 2 cm, so as to perform level conversion on the detection signal before generating more inter-phase interference noise to obtain a corresponding DC level signal.

[0188] During the detection process, the multi-phase power supply detection system transmits test instructions to the multi-phase power supply through IIC communication to control the multi-phase power supply to be in a working state, so that the output end of each phase power supply starts to output an output signal. At this time, the detection device 201 obtains the detection signal of the output end of each phase power supply in real time, and transmits the detection signal to the level conversion device 202, and then the detection signal is converted into a DC level signal through the level conversion device 202. The amplitude of the DC level signal is used to indicate the output voltage of the corresponding phase power supply, and the DC level signal is transmitted to the level detection device 203; after receiving the DC level signal, the level detection device 203 determines whether the phase power supply is in an abnormal state according to the difference between the DC level signal and the preset level value.

[0189] The level detection device 203, the detection device 201 and the level conversion device 202 may respectively execute the following control logic during specific implementation:

[0190] The detection device 201 is used to obtain a detection signal from the output end of each phase of the multi-phase power supply 10 to be tested, and the multi-phase power supply to be tested is in a working state;

[0191] The level conversion device 202 is used to perform level conversion on multiple detection signals of the multi-phase power supply 10 to obtain multiple DC level signals corresponding to the multiple detection signals one by one, and the amplitude of the DC level signal is used to indicate the output voltage of the corresponding phase power supply;

[0192] The level detection device 203 is used to determine the state of each phase power supply in the multi-phase power supply according to multiple DC level signals, and the state of each phase power supply includes a normal state or an abnormal state.

[0193] In some embodiments, the level detection device 203 determines the state of each phase power supply in the multi-phase power supply according to the amplitudes of the plurality of DC level signals, including:

[0194] The level detection device 203 obtains the amplitude of each DC level signal among the multiple DC level signals, and determines the power supply in an abnormal state according to the difference between the amplitude of each DC level signal and a preset level value;

[0195] When the absolute value of the difference between the amplitude of the target DC level signal and the preset level value is greater than a threshold, it is determined that the power supply corresponding to the target DC level signal is a power supply in an abnormal state, and the target DC level signal is one of multiple DC level signals.

[0196] In some embodiments, the level detection device includes a DC voltmeter, which is connected to the level conversion device. The level detection device obtains the amplitude of each DC level signal in the multiple DC level signals, including:

[0197] The level detection device obtains the amplitude of each DC level signal through a DC voltmeter.

[0198] In some embodiments, each phase power supply includes a first switch element and a second switch element, the input end of the first switch element is connected to the input end of each phase power supply, the output end of the first switch element is connected to the output end of each phase power supply, the input end of the second switch element is connected between the output end of the first switch element and the output end of each phase power supply, the output end of the second switch element is connected to the ground end, and the level detection device 203 is further used for:

[0199] When the state of the target phase power supply includes an abnormal state, the target failure element in the target phase power supply is determined based on the corresponding relationship between the preset failure element and the level signal, and the target DC level signal corresponding to the target phase power supply. The target failure element includes the first switching element or the second switching element, and the target phase power supply is any one phase or multiple phases in the multi-phase power supply.

[0200] In some embodiments, Figure 9-14 The level conversion device 202 includes a plurality of level conversion units, each of which corresponds to the multi-phase power supply 10. Each level conversion unit includes an energy storage element and an impedance element. The input end of the impedance element is connected to the detection device, the output end of the impedance element is connected to the level detection device, the input end of the energy storage element is connected to the output end of the impedance element, and the output end of the energy storage element is connected to the ground end, wherein:

[0201] An impedance element, used for receiving a detection signal and outputting a processed detection signal according to the detection signal and a preset impedance parameter;

[0202] The energy storage element is used to receive the processed detection signal, store part of the power of the processed detection signal when the processed detection signal is at a high level, and release part of the stored power when the processed detection signal is at a low level, so that the voltage value of the DC level signal corresponding to the detection signal is stabilized within a preset voltage range.

[0203] In some embodiments, the detection device 201 includes a signal detector and a ground detector, the signal detector is connected to the input end of the impedance element through a first connection line, and the ground detector is connected to the ground end of the level conversion device 202 through a second connection line, so that the level conversion device 202 obtains the detection signal of the corresponding phase power supply through the first connection line;

[0204] The level detection device 203 includes a signal receiving end and a ground end. The signal receiving end is connected to the output end of the impedance element through a third connecting line. The ground end of the level detection device 203 is connected to the ground end of the level conversion device 202 through a fourth connecting line, so that the level detection device 203 obtains a DC level signal through the third connecting line.

[0205] In some embodiments, Fig.18 , the distance between the detection device 201 and the level conversion device 202 is less than or equal to a preset distance threshold.

[0206] In some embodiments, Fig.15 The multi-phase power supply detection system further includes an amplifier, the input end of the amplifier is connected to the level conversion device, the output end of the amplifier is connected to the level detection device 203, and the amplifier is used to:

[0207] amplifying the multiple detection signals to obtain multiple amplified detection signals;

[0208] Accordingly, the level conversion device 202 performs level conversion on the multiple detection signals, including:

[0209] The level conversion device 202 performs level conversion on the multiple amplified detection signals to obtain multiple DC level signals.

[0210] In some embodiments, the multi-phase power supply detection system further includes a processor, the processor being configured to:

[0211] A test instruction is sent to the multi-phase power supply to be tested, and the test instruction is used to control the multi-phase power supply to be tested to be in a working state.

[0212] In some embodiments, the processor sends a test instruction to the multi-phase power supply to be tested, including:

[0213] The processor sends a test instruction to the controller of the multi-phase power supply to be tested based on the target timing, so that the multi-phase power supply to be tested receives the test instruction based on the target communication mode, and the target timing is consistent with the communication timing of the multi-phase power supply to be tested working in the target communication mode.

[0214] The above is only an implementation method of the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the embodiment of the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the embodiment of the present application should be based on the protection scope of the claims.

Claims

1. A multi-phase power supply detection system, characterized in that: The multi-phase power supply detection system comprises a detection device, a level conversion device and a level detection device, wherein the level conversion device is connected between the detection device and the level detection device, wherein: The detection device is used to obtain a detection signal from the output end of each phase power supply in the multi-phase power supply to be tested; The level conversion device is used to perform level conversion on the multiple detection signals of the multi-phase power supply to obtain a plurality of DC level signals corresponding to the multiple detection signals one by one, and the amplitude of the DC level signal is used to indicate the output voltage of the corresponding phase power supply; The level detection device is used to determine the state of each phase power supply in the multi-phase power supply according to the amplitudes of the multiple DC level signals, and the state of each phase power supply includes a normal state or an abnormal state.

2. The multi-phase power supply detection system according to claim 1, characterized in that: The detection device and the input end of the level conversion device are connected via a connecting line, and the length of the connecting line is less than or equal to a preset length threshold.

3. The multi-phase power supply detection system according to claim 1 or 2, characterized in that: Each phase power supply comprises a first switch element and a second switch element, wherein an input end of the first switch element is connected to an input end of the each phase power supply, an output end of the first switch element is connected to an output end of the each phase power supply, an input end of the second switch element is connected between an output end of the first switch element and an output end of the each phase power supply, and an output end of the second switch element is connected to a ground end; When the state of the target phase power supply includes the abnormal state, the level detection device is used to determine the target failure element in the target phase power supply based on the corresponding relationship between the preset failure element and the level signal, and the target DC level signal corresponding to the target phase power supply, the target failure element includes the first switching element or the second switching element, and the target phase power supply is any one phase or multiple phases of the multi-phase power supply.

4. The multi-phase power supply detection system as claimed in claim 2, characterized in that: The level conversion device includes a plurality of level conversion units, the plurality of level conversion units correspond to the multi-phase power supply one by one, each level conversion unit includes an energy storage element and an impedance element, the input end of the impedance element is connected to the detection device, the output end of the impedance element is connected to the level detection device, the input end of the energy storage element is connected to the output end of the impedance element, and the output end of the energy storage element is connected to the ground, wherein: The impedance element is used to receive the detection signal and output a processed detection signal according to the detection signal and a preset impedance parameter; The energy storage element is used to receive the processed detection signal, store part of the power of the processed detection signal when the processed detection signal is at a high level, and release part of the stored power when the processed detection signal is at a low level, so that the voltage value of the DC level signal corresponding to the detection signal is stabilized within a preset voltage range.

5. The multi-phase power supply detection system as claimed in claim 4, characterized in that: The detection device includes a signal detector and a ground detector, the signal detector is connected to the input end of the impedance element through a first connecting line, and the ground detector is connected to the ground end of the level conversion device through a second connecting line, so that the level conversion device obtains the detection signal of the corresponding phase power supply through the first connecting line; The level detection device includes a signal receiving end and a ground end, the signal receiving end is connected to the output end of the impedance element through a third connecting line, and the ground end of the level detection device is connected to the ground end of the level conversion device through a fourth connecting line, so that the level detection device obtains the DC level signal through the third connecting line.

6. A method for detecting a multi-phase power supply, characterized in that: Applied to a multi-phase power supply detection system, the multi-phase power supply detection system comprises a detection device, a level conversion device and a level detection device, the level conversion device is connected between the detection device and the level detection device, the method comprises: Acquiring a detection signal from the output end of each phase power supply in the multi-phase power supply to be tested through the detection device; The level conversion device performs level conversion on the multiple detection signals of the multi-phase power supply to obtain a plurality of DC level signals corresponding to the multiple detection signals one by one, wherein the amplitude of the DC level signal is used to indicate the output voltage of the corresponding phase power supply; The level detection device determines the state of each phase power supply in the multi-phase power supply according to the amplitudes of the multiple DC level signals, and the state of each phase power supply includes a normal state or an abnormal state.

7. The method according to claim 6, characterized in that The level detection device determines the state of each phase power supply in the multi-phase power supply according to the amplitude of the plurality of DC level signals, including: Acquiring the amplitude of each DC level signal among the plurality of DC level signals through the level detection device, and determining the power supply in an abnormal state according to the difference between the amplitude of each DC level signal and a preset level value; Among them, when the absolute value of the difference between the amplitude of the target DC level signal and the preset level value is greater than a threshold, it is determined that the power supply corresponding to the target DC level signal is the power supply in an abnormal state, and the target DC level signal is one of the multiple DC level signals.

8. The method according to claim 6 or 7, characterized in that Each phase power supply includes a first switch element and a second switch element, an input end of the first switch element is connected to an input end of the each phase power supply, an output end of the first switch element is connected to an output end of the each phase power supply, an input end of the second switch element is connected between an output end of the first switch element and an output end of the each phase power supply, and an output end of the second switch element is connected to a ground end, and the method further includes: When the state of the target phase power supply includes the abnormal state, the level detection device determines the target failure element in the target phase power supply based on the corresponding relationship between the preset failure element and the level signal, and the target DC level signal corresponding to the target phase power supply. The target failure element includes the first switching element or the second switching element, and the target phase power supply is any one phase or multiple phases of the multi-phase power supply.

9. The method according to claim 6, characterized in that The detection device and the input end of the level conversion device are connected via a connecting line, and the length of the connecting line is less than or equal to a preset length threshold.

10. The method according to claim 6, characterized in that The multi-phase power supply detection system further includes an amplifier, an input end of the amplifier is connected to the level conversion device, and an output end of the amplifier is connected to the level detection device. The method further includes: Amplifying the plurality of DC level signals by the amplifier to obtain a plurality of amplified DC level signals; Correspondingly, determining the state of each phase power supply in the multi-phase power supply according to the amplitudes of the plurality of DC level signals by the level detection device includes: The state of each phase power supply in the multi-phase power supply is determined by the level detection device according to the amplitudes of the multiple amplified DC level signals.

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