A chassis ground detection apparatus and method

Abstract

This application discloses a chassis grounding detection device and method for detecting the grounding state of a chassis. The device includes a controller, a drive circuit, a coupling device, and a sampling circuit. The coupling device includes a primary winding and a secondary winding. The first end of the primary winding is connected to the first output terminal of the drive circuit, and the second end of the primary winding is connected to the second output terminal of the drive circuit through the sampling circuit. The first end of the secondary winding is connected to the chassis, and the second end of the secondary winding is connected to a grounding terminal. The output terminal of the sampling circuit is connected to the input terminal of the controller. The drive circuit provides AC power to the primary winding. The sampling circuit samples the voltage of the primary winding. When the chassis is grounded, the impedance of the secondary winding is small, therefore the impedance of the primary winding is correspondingly small. If the controller detects that the voltage of the received sampling signal is within a preset range, it can detect that the chassis is grounded; otherwise, it detects that the chassis is not grounded.

Description

Technical Field

[0001] This application relates to the field of insulation testing, and more particularly to a casing grounding testing device and method. Background Technology

[0002] With the widespread application of electricity, electrical equipment is frequently used in various industries. For most electrical equipment, under normal working conditions, the casing is not energized or the casing voltage is within a safe range. However, if the electrical equipment experiences insulation failure or static electricity accumulation, the accessible and exposed metal parts will become energized. For example, the casing of electrical equipment is often made of metal and grounded through a grounding busbar. Grounding busbars are generally made of hot-dip galvanized flat steel, copper busbars, or copper-clad steel. Due to environmental factors, grounding busbars are easily corroded or damaged. When the casing is poorly grounded or not grounded, a high potential difference will be formed between the casing and the ground, resulting in insulation degradation or leakage. The casing will then be at risk of becoming energized. If a person accidentally touches the casing, a path will be formed through their body, causing an electric shock accident. In addition, it will also affect the safety of related equipment and even the entire power system.

[0003] Therefore, how to detect the grounding status of the casing and ensure the safety of the power system is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a chassis grounding detection device and method to solve the problem of how to detect the grounding of a chassis.

[0005] In a first aspect, embodiments of this application provide a chassis grounding detection device, the device comprising a controller, a drive circuit, a coupling device, and a sampling circuit; wherein the coupling device comprises a primary winding and a secondary winding;

[0006] The first end of the primary winding is connected to the first output terminal of the drive circuit, the second end of the primary winding is connected to the second output terminal of the drive circuit through the sampling circuit, the first end of the secondary winding is used to connect to the housing, the second end of the secondary winding is used to connect to the ground terminal, and the output terminal of the sampling circuit is connected to the input terminal of the controller.

[0007] The drive circuit is used to provide alternating current to the primary winding;

[0008] The sampling circuit is used to sample the voltage of the primary winding and generate a sampling signal;

[0009] The controller is configured to detect that the chassis is grounded when the voltage of the sampled signal is within a preset range.

[0010] Based on the above technical solution, under the control of the controller, AC power is generated by the drive circuit, forming a current I1 in the primary winding. Furthermore, based on electromagnetic induction, an induced current I2 is formed in the secondary winding. The ratio of current I1 to current I2 is related to the winding turns ratio. Since there is impedance between the grounding terminal and the chassis, when the chassis is properly grounded, the secondary winding has a certain impedance, and the corresponding primary winding also has a certain AC impedance. The sampling circuit samples the voltage of the primary winding, generates a sampling signal, and transmits it to the controller. If the voltage of the received sampling signal is within a preset range, the controller detects that the chassis is grounded. When the chassis grounding is poor or disconnected, the impedance of the secondary winding is approximately infinite, and therefore the AC impedance of the primary winding also increases accordingly. The sampling circuit samples the voltage of the primary winding, generates a sampling signal, and if the voltage of the received sampling signal increases beyond the preset range, the controller detects that the chassis is not grounded.

[0011] In one possible implementation, the coupling device is a coupling inductor or a transformer.

[0012] The coupled inductor or transformer in the above scheme is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components include primary winding and secondary winding.

[0013] In one possible implementation,

[0014] The device further includes a signal processing circuit connected between the sampling circuit and the controller;

[0015] The signal processing circuit is used to filter the sampled signal.

[0016] Based on the above technical solution, by setting a signal processing circuit between the sampling circuit and the controller, the circuit performs signal filtering processing, making the processed sampling signal more accurate and more suitable for the controller to process.

[0017] In one possible implementation, the output of the controller is connected to the input of the drive circuit;

[0018] The controller is used to generate a pulse width modulation (PWM) signal and control the drive circuit to generate alternating current through the PWM signal.

[0019] Based on the above technical solution, a PWM signal can be generated by the controller to control the switching of field-effect transistors or transistors in the drive circuit to open or close, thereby controlling the drive circuit to generate AC power of a certain frequency.

[0020] In one possible implementation, the device further includes a self-excited oscillation circuit, the output of which is connected to the input of the drive circuit.

[0021] The self-excited oscillation circuit is used to generate an AC signal and control the drive circuit to generate AC power through the AC signal.

[0022] Based on the above technical solution, an AC signal can be generated by a self-excited oscillation circuit to control the opening or closing of switches such as field-effect transistors or triodes in the drive circuit, thereby controlling the drive circuit to generate AC current of a certain frequency.

[0023] In one possible implementation, the driving circuit includes a driving sub-circuit and a switching sub-circuit, wherein the input terminal of the driving sub-circuit serves as the input terminal of the driving circuit, the output terminal of the switching sub-circuit serves as the output terminal of the driving circuit, and the output terminal of the driving sub-circuit is connected to the input terminal of the switching sub-circuit.

[0024] The driving sub-circuit is used to amplify the received signal;

[0025] The switching sub-circuit is used to generate the alternating current based on the amplified signal.

[0026] Based on the above technical solution, the drive sub-circuit amplifies the control signal received from the controller, and then the switch sub-circuit controls the switch according to the control signal to generate AC power of a certain frequency.

[0027] In one possible implementation, the switching sub-circuit is a full-bridge switching sub-circuit, a half-bridge switching sub-circuit, or a low-side switching sub-circuit.

[0028] Secondly, this application also provides a chassis grounding detection method, which is applied to a chassis grounding detection device;

[0029] The chassis grounding detection device includes a controller, a drive circuit, a coupling device, and a sampling circuit; wherein, the coupling device includes a primary winding and a secondary winding; the first end of the primary winding is connected to the first output terminal of the drive circuit, the second end of the primary winding is connected to the second output terminal of the drive circuit through the sampling circuit, the first end of the secondary winding is used to connect to the chassis, the second end of the secondary winding is used to connect to the grounding terminal, and the output terminal of the sampling circuit is connected to the input terminal of the controller;

[0030] The method includes:

[0031] Alternating current is supplied to the primary winding;

[0032] The voltage of the primary winding is sampled to generate a sampling signal;

[0033] When the voltage of the sampled signal is within a preset range, the chassis is detected to be grounded.

[0034] In one possible implementation, the chassis grounding detection device further includes a signal processing circuit, the input terminal of which is connected to the output terminal of the sampling circuit, and the output terminal of which is connected to the input terminal of the controller.

[0035] After sampling the voltage of the primary winding and generating a sampling signal, the method includes:

[0036] The sampled signal is then filtered.

[0037] In one possible implementation, the driving circuit includes a driving sub-circuit and a switching sub-circuit, wherein the input terminal of the driving sub-circuit serves as the input terminal of the driving circuit, the output terminal of the switching sub-circuit serves as the output terminal of the driving circuit, and the output terminal of the driving sub-circuit is connected to the input terminal of the switching sub-circuit.

[0038] Providing alternating current to the primary winding includes:

[0039] Amplify the received signal;

[0040] The amplified signal is used to generate the alternating current.

[0041] Thirdly, this application also provides a controller for use in a chassis grounding detection device. The controller may include: at least one processor; and a memory and a communication interface communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the at least one processor performs the functions of the first aspect or any possible design method of the first aspect by executing the instructions stored in the memory.

[0042] Fourthly, this application also provides a computer storage medium including computer instructions that, when executed on a computer, cause the computer to perform the methods described in the second aspect or any possible design of the second aspect.

[0043] Fifthly, this application also provides a computer program product that, when run on a computer, causes the computer to perform the methods described in the second aspect or any possible design of the second aspect. Attached Figure Description

[0044] Figure 1 A schematic diagram illustrating a power application scenario provided in an embodiment of this application;

[0045] Figure 2 This is a schematic diagram of the structure of a chassis grounding detection device provided in an embodiment of this application;

[0046] Figure 3a This is a schematic diagram of another chassis grounding detection device provided in an embodiment of this application;

[0047] Figure 3b This is a schematic diagram of another chassis grounding detection device provided in an embodiment of this application;

[0048] Figure 4 This is a schematic diagram of another chassis grounding detection device provided in an embodiment of this application;

[0049] Figure 5 This is a schematic diagram of another chassis grounding detection device provided in an embodiment of this application;

[0050] Figure 6 This is a schematic diagram of another chassis grounding detection device provided in an embodiment of this application;

[0051] Figure 7 This is a schematic diagram of another chassis grounding detection device provided in an embodiment of this application;

[0052] Figure 8 This is a schematic diagram of another chassis grounding detection device provided in an embodiment of this application;

[0053] Figure 9 A schematic flowchart illustrating a chassis grounding detection method provided in an embodiment of this application;

[0054] Figure 10 This is a schematic diagram of the structure of a controller provided in an embodiment of this application. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0056] To facilitate understanding of the embodiments of this application, the terms involved in the embodiments of this application will be explained below.

[0057] I. Coupled Inductor

[0058] An inductor is also called a self-inductor. If the magnetic flux generated by each of two or more windings is linked to another winding, these windings are said to be magnetically coupled or mutually inductant. If we assume that these windings are stationary and ignore the resistance in the windings and the distributed capacitance between the turns, the windings with magnetic coupling can be represented as coupled inductors, or simply coupled inductors.

[0059] II. Transformer

[0060] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. It mainly consists of a primary winding, a secondary winding, and a magnetic core. It is generally used for voltage transformation, current transformation, impedance transformation, isolation, or voltage stabilization.

[0061] III. Pulse Width Modulation (PWM)

[0062] Pulse width modulation (PWM) is an analog control method that modulates the bias of the base of a transistor or the gate of a field-effect transistor (FET) according to changes in the load, thereby altering the conduction time of the transistor or FET and thus changing the output of a switching power supply. This allows the output voltage of the power supply to remain constant despite changes in operating conditions. A PWM wave typically consists of a series of rectangular pulses with different duty cycles, the duty cycle of which is proportional to the instantaneous sampled value of the signal.

[0063] IV. Self-excited oscillation

[0064] Self-excited oscillation refers to a steady and continuous oscillation that occurs spontaneously without an external excitation signal. If no input signal is applied to the input of an amplifier, but the output still produces an output signal with a certain amplitude and frequency, this phenomenon is called self-excited oscillation. For example, adding negative feedback between stages in a multi-stage amplifier circuit can cause the signal phase shift, making the negative feedback amplifier circuit unstable and generating self-excited oscillation. Three-stage or higher negative feedback amplifier circuits, as long as they have a certain feedback depth, may generate self-excited oscillation.

[0065] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the embodiments of this application, “one or more” means one or more (including two); “and / or” describes the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0066] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0067] In this application's embodiments, the term "multiple" refers to two or more. Therefore, in this application's embodiments, "multiple" can also be understood as "at least two." "At least one" can be understood as one or more, such as one, two, or more. For example, "including at least one" means including one, two, or more, and is not limited to which ones are included. For example, "including at least one of A, B, and C" could mean A, B, C; A and B; A and C; B and C; or A and B and C. Similarly, the understanding of descriptions such as "at least one" is similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone; A and B existing simultaneously; or B existing alone. Additionally, the character " / ", unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0068] Unless otherwise stated, the ordinal numbers such as "first" and "second" mentioned in the embodiments of this application are used to distinguish multiple objects, and are not used to limit the order, sequence, priority or importance of multiple objects.

[0069] To make the purpose, technical solution, and advantages of this application clearer, the application background of this application will be described below in conjunction with the accompanying drawings:

[0070] With the widespread use of electricity and the increasing prevalence of electrical equipment across various industries, people are spending more and more time in contact with electricity. Improper installation, unreasonable use, or untimely maintenance of electrical equipment can not only lead to wasted energy but also cause electrical accidents, endangering personal safety and causing significant losses.

[0071] Under normal operating conditions, most electrical equipment has a non-energized casing or a casing voltage within a safe range. However, if the equipment experiences insulation failure or static electricity buildup, accessible and exposed metal parts can become charged. For example, ... Figure 1The diagram shows a power application scenario. The power grid 101 transmits power to the transformer 102. After the transformer transforms the voltage, it transmits the power to the electrical equipment 103. The casing K of the electrical equipment 103 is often made of metal and is grounded through the grounding busbar L. The grounding busbar L is generally made of hot-dip galvanized flat steel, copper busbar, copper-clad steel, etc. Due to environmental factors, the grounding busbar L is easily corroded or damaged.

[0072] Furthermore, when the casing K is poorly grounded or not grounded, a high potential difference will be formed between the casing K and the ground, resulting in decreased insulation or leakage. The casing K will then be at risk of becoming electrified. If a person accidentally touches the casing K, an electric shock accident will occur through the person's body. In addition, it will also affect the safety of related equipment and even the entire power system.

[0073] To address the aforementioned issues, traditional grounding detection techniques often employ signal injection. This involves connecting switches to each of the three phases of the power system, using these switches to control a signal source device for grounding. For instance, when a B-phase ground fault occurs, the A-phase switch closes, grounding the signal source. The signal current is then channeled through the B-phase fault line, across the ground, and back to the signal source to pinpoint the fault location. While signal injection allows electrical workers to locate faults, it is time-consuming and injects signals into the power system, causing interference and compromising the overall stability of the power grid. Therefore, it is not practical.

[0074] Based on the above problems, this application provides a chassis grounding detection device and method to solve the problem of detecting the chassis grounding status and ensuring the safety of the power system.

[0075] The following describes the power system provided by an exemplary embodiment of this application in conjunction with the application scenarios described above and with reference to the accompanying drawings. It should be noted that the above application scenarios are only shown to facilitate understanding of the spirit and principles of this application, and the embodiments of this application are not limited in any way in this respect.

[0076] Figure 2 This is a schematic diagram of a chassis grounding detection device provided in an embodiment of this application. The device includes a controller 201, a drive circuit 202, a coupling device 203, and a sampling circuit 204. The coupling device 203 includes a primary winding 2031, a magnetic core 2032, and a secondary winding 2033. The first end of the primary winding 2031 is connected to the first output terminal of the drive circuit 202, and the second end of the primary winding 2031 is connected to the second output terminal of the drive circuit 202 through the sampling circuit 204. The first end of the secondary winding 2033 is connected to the chassis K, forming... Figure 2 Point A is the coupling point. The second end of the secondary winding 2033 is connected to the grounding terminal. The casing K is connected to the grounding terminal through the grounding bus L, forming... Figure 2The coupling point shown at point B connects the output of sampling circuit 204 to the input of controller 201.

[0077] The drive circuit 202 is used to provide alternating current to the primary winding 2031;

[0078] The sampling circuit 204 is used to sample the voltage of the primary winding 2031, generate a sampling signal, and transmit the sampling signal to the controller 201.

[0079] The controller 201 is used to detect that the chassis is grounded when the voltage of the received sampled signal is within a preset range.

[0080] It should be noted that the coupling device 203 is a device that uses the principle of electromagnetic induction to change the AC voltage. For example, if a current I1 is applied to the primary winding 2031, the secondary winding 2033 will generate an induced current I2 based on electromagnetic induction. The ratio of current I1 to current I2 is related to the winding turns ratio.

[0081] In one possible implementation, the coupling device 203 can be a transformer or a coupling inductor comprising a primary winding 2031, a secondary winding 2033, and a magnetic core 2032. Alternatively, when using a transformer, the chassis grounding detection device provided in this application can utilize the isolation effect of the transformer to electrically isolate high voltage and low voltage to prevent serious accidents caused by accidental human contact with live parts. It should be noted that the high voltage and low voltage here are divided based on the human body's safe voltage.

[0082] In the chassis grounding detection device, under the control of the controller, the drive circuit 202 generates AC power and forms a current in the primary winding 2031. Based on electromagnetic induction, an induced current is formed in the secondary winding 2033. Due to the impedance between the grounding terminal and the chassis K, when the chassis K is properly grounded, the secondary winding 2033 has a certain impedance, and therefore the primary winding 2031 also has a certain AC impedance. The sampling circuit 204 samples the voltage of the primary winding 2031 to generate a sampling signal, which is then transmitted to the controller 201. The controller 201 detects that the chassis K is grounded based on the voltage magnitude of the received sampling signal. When the chassis K is poorly grounded or disconnected, the impedance of the secondary winding 2033 is approximately infinite, and therefore the AC impedance of the primary winding 2031 also increases accordingly. The sampling circuit 204 samples the voltage of the primary winding 2031 to generate a sampling signal. The controller 201 receives a larger voltage signal from the sampling signal, which indicates that the chassis K is not grounded.

[0083] For example, when the digital voltage of the received sampling signal is between 0 and 3.3V, the controller 201 detects that the chassis K is grounded. When the chassis K is grounded, the impedance of the secondary winding 2033 is approximately infinite, and the impedance of the primary winding 2031 increases accordingly. The digital voltage of the sampling signal received by the controller 201 increases and exceeds 0 to 3.3V. The controller 201 then detects that the chassis K is not grounded.

[0084] The following is combined Figure 2 The chassis grounding detection device shown illustrates the process of generating control signals:

[0085] In one possible embodiment, controller 201 may be a processor. For example, controller 201 may be a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing unit (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The aforementioned processor may also be a combination that implements computational functions. For example, controller 201 may further include one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0086] In one possible embodiment, such as Figure 3a As shown, the output terminal of the controller 201 and the input terminal of the drive circuit 202 are connected. The controller 201 includes a pulse width modulation circuit. The controller 201 can generate a PWM wave through the PWM circuit to control the field effect transistor or transistor in the drive circuit 202 to open or close, thereby controlling the drive circuit 202 to generate high-frequency AC power.

[0087] In one possible embodiment, such as Figure 3b As shown, the detection device also includes a self-excited oscillation circuit 301. The output terminal of the self-excited oscillation circuit 301 is connected to the input terminal of the drive circuit 202. The self-excited oscillation circuit 301 can output an AC signal with a certain amplitude and frequency when there is no input signal. Therefore, in this embodiment, the controller 201 in the detection device is not used to control the drive circuit 202 to generate high-frequency AC power, but rather the self-excited oscillation circuit 301 controls the drive circuit 202 to generate high-frequency AC power.

[0088] The following section provides a detailed description of the structure of the chassis grounding detection device:

[0089] based on Figure 2 The shown chassis grounding detection device Figure 4 A schematic diagram of another chassis grounding detection device provided in this application embodiment is shown below. Figure 4 As shown, the driving circuit 202 in the detection device includes a driving sub-circuit 401 and a switching sub-circuit 402. The input terminal of the driving sub-circuit 401 serves as the input terminal of the driving circuit 202, and the output terminal of the switching sub-circuit 402 serves as the output terminal of the driving circuit 202. The output terminal of the driving sub-circuit 401 is connected to the input terminal of the switching sub-circuit 402. The driving sub-circuit 401 drives the driving sub-circuit 401.

[0090] The driver sub-circuit 401 is used to amplify the received control signal and output the amplified control signal to the switch sub-circuit 402;

[0091] The switching sub-circuit 402 is used to generate alternating current based on the amplified control signal.

[0092] In one possible embodiment, the switching sub-circuit 402 can be a full-bridge switching sub-circuit, such as... Figure 5 As shown, the full-bridge switching sub-circuit 501 includes switches K1, K2, K3, and K4. Switches K1 to K4 can be transistors or switching transistors. The power supply terminal VCC is connected to the first terminal of switch K1 and the first terminal of switch K2, respectively. The second terminal of switch K1 is connected to the first terminal of switch K3 and the primary winding 2031, respectively. The second terminal of switch K2 is connected to the first terminal of switch K4 and the sampling circuit 204, respectively. The second terminal of switch K3 is connected to the second terminal of switch K4 and the ground terminal, respectively. The output terminal of the driving sub-circuit 401 is connected to the control terminals of switches K1 to K4, respectively. The driving sub-circuit 401 is used to control the conduction and turn-off of switches K1 to K4.

[0093] In one possible embodiment, the switching sub-circuit 402 can be a half-bridge switching sub-circuit, such as... Figure 6 As shown, the half-bridge switch sub-circuit 601 includes switches K5 and K6, which can be transistors or switching transistors. The first terminal of switch K5 is connected to the power supply terminal VCC, and the second terminal of switch K5 is connected to the first terminal of switch K6 and the primary winding 2031, respectively. The second terminal of switch K6 is connected to the sampling circuit 204 and the ground terminal. The drive sub-circuit 401 is connected to the control terminals of switches K5 and K6, respectively, and the drive sub-circuit 401 is used to control the conduction and turn-off of switches K5 and K6.

[0094] In one possible embodiment, the switching sub-circuit 402 can be a low-side switching sub-circuit, such as... Figure 7As shown, the low-side switching sub-circuit 701 includes a switch K7, which can be a transistor or a switching transistor. The power supply terminal VCC is connected to the primary winding 2031. The first terminal of the switch K7 is connected to the sampling circuit 204, and the second terminal of the switch K7 is connected to the ground terminal. The driving sub-circuit 401 is connected to the control terminal of the switch K7 and is used to control the switching on and off of the switch K7.

[0095] In addition, to facilitate accurate processing of the received signal by the controller 201, the detection device may also include a signal processing circuit, such as... Figure 8 As shown, the signal processing circuit 801 is connected between the output terminal of the sampling circuit 204 and the input terminal of the controller 201;

[0096] Sampling circuit 204 is used to send sampling signals to signal processing circuit 801;

[0097] The signal processing circuit 801 is used to filter the received sampled signal and output the processed sampled signal to the controller 201.

[0098] In one possible embodiment, the signal processing circuit 801 can be used to filter the received sampled signal, filter out the ripple in the sampled signal, so that the processed sampled signal is more accurate and more suitable for the controller 201 to process.

[0099] In one possible embodiment, the signal processing circuit 801 can be used to perform digital-to-analog conversion on the received sampled signal, that is, to convert the analog quantity of the sampled signal into a digital quantity, so that the controller 201 can further control the drive circuit 202 based on the digital sampled signal.

[0100] Accordingly, such as Figure 9 As shown, this application provides a chassis grounding detection method, which can be applied to the chassis grounding detection device provided in the above embodiments of this application. The method may include:

[0101] S901, the controller transmits control signals to the drive circuit;

[0102] S902, the drive circuit provides AC power to the primary winding according to the received control signal;

[0103] S903, the sampling circuit samples the voltage of the primary winding, generates a sampling signal, and transmits the sampling signal to the controller;

[0104] S904, the controller detects whether the chassis is grounded based on the received sampling signal.

[0105] Accordingly, such as Figure 10As shown in the diagram, this application provides a schematic diagram of a controller, which includes a memory 1002 communicatively connected to at least one processor 1001. The memory 1002 stores instructions executable by the at least one processor 1001. (See attached diagram) Figure 10 The dashed line indicates that memory 1002 is optional for the controller.

[0106] The processor 1001 and the memory 1002 can be coupled through an interface circuit or integrated together; no restriction is imposed here.

[0107] This application embodiment does not limit the specific connection medium between the processor 1001, memory 1002, and communication interface 1003. This application embodiment... Figure 10 The processor 1001, memory 1002, and communication interface 1003 are connected via a bus 1004, and the bus 1004 is in... Figure 10 The connections between other components are shown in bold and are for illustrative purposes only, not as limiting information. The bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, Figure 10 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0108] It should be noted that the processor mentioned in the embodiments of this application can be implemented in hardware or software. When implemented in hardware, the processor can be a logic circuit, integrated circuit, etc. When implemented in software, the processor can be a general-purpose processor, implemented by reading software code stored in memory.

[0109] For example, the processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0110] It should be noted that the memory mentioned in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Specifically, non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0111] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, the memory (storage module) can be integrated into the processor.

[0112] It should be noted that the memories described herein are intended to include, but are not limited to, these and any other suitable types of memories.

[0113] Based on the same technical concept, embodiments of this application also provide a computer storage medium, including a program or instructions, which, when executed on a computer, cause... Figure 9 The method shown was executed.

[0114] Based on the same technical concept, embodiments of this application also provide a chip, which is coupled to a memory for reading and executing program instructions stored in the memory, such that... Figure 9 The method shown was executed.

[0115] Based on the same technical concept, embodiments of this application also provide a computer program product, including instructions that, when executed on a computer, cause... Figure 9 The method shown was executed.

[0116] It should be noted that all relevant content of each step involved in the above method embodiments can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

[0117] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0118] This application is described with reference to flowchart illustrations and / or block diagrams of the methods, apparatus (systems), and computer program products according to this application. It should be noted that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0119] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0120] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0121] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of protection of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A chassis ground detection apparatus, characterized by comprising: The device includes a controller, a drive circuit, a coupling device, and a sampling circuit; wherein the coupling device includes a primary winding and a secondary winding. The first end of the primary winding is connected to the first output terminal of the drive circuit, the second end of the primary winding is connected to the second output terminal of the drive circuit through the sampling circuit, the first end of the secondary winding is used to connect to the housing, the second end of the secondary winding is used to connect to the ground terminal, and the output terminal of the sampling circuit is connected to the input terminal of the controller. The drive circuit is used to provide alternating current to the primary winding; The sampling circuit is used to sample the voltage of the primary winding and generate a sampling signal; The controller is configured to detect that the chassis is grounded when the voltage of the sampled signal is within a preset range.

2. The apparatus of claim 1, wherein, The coupling device is a coupling inductor or a transformer.

3. The apparatus of claim 1, wherein, The device further includes a signal processing circuit connected between the sampling circuit and the controller; The signal processing circuit is used to filter the sampled signal.

4. The apparatus of any one of claims 1-3, wherein, The output terminal of the controller is connected to the input terminal of the drive circuit; The controller is used to generate a PWM signal and control the drive circuit to generate alternating current through the PWM signal.

5. The apparatus of any one of claims 1-3, wherein, The device further includes a self-excited oscillation circuit, the output of which is connected to the input of the drive circuit. The self-excited oscillation circuit is used to generate an AC signal and control the drive circuit to generate AC power through the AC signal.

6. The apparatus of any one of claims 1-3, wherein The driving circuit includes a driving sub-circuit and a switching sub-circuit. The input terminal of the driving sub-circuit serves as the input terminal of the driving circuit, and the output terminal of the switching sub-circuit serves as the output terminal of the driving circuit. The output terminal of the driving sub-circuit is connected to the input terminal of the switching sub-circuit. The driving sub-circuit is used to amplify the received signal; The switching sub-circuit is used to generate the alternating current based on the amplified signal.

7. The apparatus of claim 6, wherein, The switching sub-circuit is a full-bridge switching sub-circuit, a half-bridge switching sub-circuit, or a low-side switching sub-circuit.

8. A method of chassis ground detection, comprising: Applications in chassis grounding detection devices; The chassis grounding detection device includes a controller, a drive circuit, a coupling device, and a sampling circuit; wherein, the coupling device includes a primary winding and a secondary winding; the first end of the primary winding is connected to the first output terminal of the drive circuit, the second end of the primary winding is connected to the second output terminal of the drive circuit through the sampling circuit, the first end of the secondary winding is used to connect to the chassis, the second end of the secondary winding is used to connect to the grounding terminal, and the output terminal of the sampling circuit is connected to the input terminal of the controller; The method includes: Alternating current is supplied to the primary winding; The voltage of the primary winding is sampled to generate a sampling signal; When the voltage of the sampled signal is within a preset range, the chassis is detected to be grounded.

9. The method of claim 8, wherein, The chassis grounding detection device further includes a signal processing circuit, the input terminal of which is connected to the output terminal of the sampling circuit, and the output terminal of which is connected to the input terminal of the controller. After sampling the voltage of the primary winding and generating a sampling signal, the method includes: The sampled signal is then filtered.

10. The method of claim 8 or 9, wherein, The driving circuit includes a driving sub-circuit and a switching sub-circuit. The input terminal of the driving sub-circuit serves as the input terminal of the driving circuit, and the output terminal of the switching sub-circuit serves as the output terminal of the driving circuit. The output terminal of the driving sub-circuit is connected to the input terminal of the switching sub-circuit. Providing alternating current to the primary winding includes: Amplify the received signal; The amplified signal is used to generate the alternating current.

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