Lampblack purifier detection circuit and detection method

Abstract

The invention discloses an oil smoke purifier detection circuit and detection method, and the protection circuit comprises a phase dislocation and phase loss detection circuit which comprises three sub-circuits with the same structure, and each sub-circuit is only connected with one phase and outputs a level signal; the undervoltage and overvoltage detection circuit is used for converting three-phase power into voltage and current and then carrying out voltage detection, and comprises three voltage detection sub-circuits with the same structure, namely a first voltage detection sub-circuit, a second voltage detection sub-circuit and a third voltage detection sub-circuit; the input end of the first voltage detection sub-circuit, the input end of the second voltage detection sub-circuit and the input end of the third voltage detection sub-circuit are all connected with a binding post J41 at the electricity inlet end of the oil smoke purifier; and the controller is connected with the phase dislocation and phase loss detection circuit and is also connected with the undervoltage and overvoltage detection circuit, so that whether abnormal conditions such as undervoltage, overvoltage and phase loss occur in the oil smoke purifier or not can be detected in time, and the safety of the oil smoke purifier is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil fume purifiers, and particularly relates to an oil fume purifier protection circuit and a protection method. Background Art

[0002] The oil fume purifier, namely an integrated oil fume purifier, is mainly applied to the catering industry to purify particulate matters and harmful gases in the oil fume generated by the catering industry, achieving ultra-low oil fume emissions. However, the existing oil fume purifiers generally use 380V alternating current, which may have abnormal conditions such as undervoltage and phase loss, resulting in reduced motor efficiency, stall damage of the oil fume purifier, and overheating and burning of the coil in the fan.

[0003] Therefore, how to timely detect whether the oil fume purifier has abnormal conditions such as undervoltage, overvoltage, and phase loss, so as to protect the oil fume purifier, is a technical problem to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to solve the technical problem that in the prior art, it is impossible to timely detect the abnormal conditions of undervoltage, overvoltage, and phase loss of the oil fume purifier, so that the oil fume purifier cannot be protected in time.

[0005] To achieve the above technical purpose, on the one hand, the present invention provides an oil fume purifier detection circuit, which includes: A phase error and phase loss detection circuit, including three sub-circuits with the same structure, namely a first sub-circuit, a second sub-circuit, and a third sub-circuit. The input ends of the first sub-circuit, the second sub-circuit, and the third sub-circuit are connected to the three-phase electricity at the power input end of the oil fume purifier. Each sub-circuit is only connected to one phase of electricity and outputs a level signal; An undervoltage and overvoltage detection circuit, which is used to convert the three-phase electricity into voltage and current and then perform voltage detection, including three voltage detection sub-circuits with the same structure, namely a first voltage detection sub-circuit, a second voltage detection sub-circuit, and a third voltage detection sub-circuit. The input ends of the first voltage detection sub-circuit, the second voltage detection sub-circuit, and the third voltage detection sub-circuit are all connected to the terminal block J41 at the power input end of the oil fume purifier; A controller, which is connected to the phase error and phase loss detection circuit and is also connected to the undervoltage and overvoltage detection circuit.

[0006] Further, the first sub-circuit specifically includes: The other end of resistor R17 is connected to the first-phase power supply L1. One end of R17 is connected to one end of resistor R16. The other end of resistor R16 is connected to the positive electrode of light-emitting diode D1. The negative electrode of light-emitting diode D1 is respectively connected to the negative electrode of diode D4 and port 1 of optocoupler U4. Port 2 of optocoupler U4 is connected to the positive electrode of diode D4. Port 1 and port 2 of optocoupler U4 are connected by a diode inside the optocoupler U4. Port 3 of optocoupler U4 is grounded. Port 4 of optocoupler U4 is respectively connected to one end of resistor R2 and one end of resistor R3. One end of resistor R2 is connected to the 3.3V power supply. The other end of resistor R3 is connected to the I / O detection port in the controller.

[0007] Further, port 2 of the optocoupler in the first sub-circuit, port 2 of the optocoupler in the second sub-circuit, and port 2 of the optocoupler in the third sub-circuit are interconnected.

[0008] Further, the first voltage detection sub-circuit specifically includes: Port 2 of relay U5 is respectively connected to port 1 of terminal block J41 and the input end of the first voltage signal acquisition circuit. Port 1 of relay U5 is connected to port 3 of current transformer CT1. Port 4 of current transformer CT1 is connected to port 1 of terminal block J42. Terminal block J42 is used to output a three-phase 380V power supply to the working unit of the oil fume purifier. Port 3 of relay U5 is respectively connected to the 12V power supply, the negative electrode of diode D3, and one end of resistor R21. The other end of resistor R21 is connected to the positive electrode of light-emitting diode LED2. The positive electrode of diode D3 and the negative electrode of light-emitting diode LED2 are both connected to port 4 of relay U5. Port 4 of relay U5 is also connected to the controller. Port 2 and port 1 of current transformer CT1 are both connected to the input end of the first differential signal sampling circuit. The output end of the first voltage signal acquisition circuit and the output end of the first differential signal sampling circuit are both connected to voltage and current detection chip U1. Voltage and current detection chip U1 is also connected to the controller.

[0009] Further, the under-voltage and over-voltage detection circuit further includes a neutral line switch circuit, and the neutral line switch circuit specifically includes; Port 2 of relay U15 is connected to the neutral line end in terminal block J41. Port 1 of relay U15 is connected to the neutral line of the oil fume purifier. Port 3 of relay U15 is respectively connected to the 12V power supply, the negative electrode of diode D15, and one end of resistor R72. The other end of resistor R72 and the positive electrode of light-emitting diode LED11 are connected. Port 4 of relay U15, the positive electrode of diode D15, and the negative electrode of light-emitting diode LED11 are all connected to the controller.

[0010] On the other hand, the present invention also provides a method for detecting an oil fume purifier, which is applied to the detection circuit as described above. The method includes: Collect three-phase information at the power input end of the oil fume purifier through the phase error and phase loss detection circuit, and at the same time collect voltage information at the power input end of the oil fume purifier according to the undervoltage and overvoltage detection circuit; Compare the three-phase information with the preset standard phase information to obtain a first comparison result, and at the same time compare the voltage information with the preset standard voltage information to obtain a second comparison result; Determine the phase state and voltage state according to the first comparison result and the second comparison result.

[0011] Further, the three-phase information is specifically the time difference of the square wave signals between two adjacent phases.

[0012] An oil fume purifier detection circuit and detection method provided by the present invention, compared with the prior art, this circuit includes a phase error and phase loss detection circuit, which includes three sub-circuits with the same structure, namely the first sub-circuit, the second sub-circuit and the third sub-circuit. The input ends of the first sub-circuit, the second sub-circuit and the third sub-circuit are connected to the three-phase power at the power input end of the oil fume purifier. Each sub-circuit is only connected to one phase of electricity and outputs a level signal; an undervoltage and overvoltage detection circuit, which is used to convert the three-phase power into voltage and current and then perform voltage detection, and includes three voltage detection sub-circuits with the same structure, namely the first voltage detection sub-circuit, the second voltage detection sub-circuit and the third voltage detection sub-circuit. The input ends of the first voltage detection sub-circuit, the second voltage detection sub-circuit and the third voltage detection sub-circuit are all connected to the terminal block J41 at the power input end of the oil fume purifier; a controller, which is connected to the phase error and phase loss detection circuit and is also connected to the undervoltage and overvoltage detection circuit, and can timely detect whether the oil fume purifier has abnormal conditions such as undervoltage, overvoltage and phase loss, thus ensuring the safety of the oil fume purifier. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments described in this specification. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 The overall structural schematic diagram of the oil fume purifier detection circuit in the embodiment of this specification is shown; Figure 2 The structural schematic diagram of the phase error and phase loss detection circuit in the embodiment of this specification is shown; Figure 3 The figure shows a schematic structural diagram of an undervoltage and overvoltage detection circuit in an embodiment of this specification; Figure 4 The figure shows a schematic structural diagram of a neutral line switch circuit in an embodiment of this specification; Figure 5 The figure shows a schematic flowchart of a detection method for an oil fume purifier in an embodiment of this specification. Detailed implementation manners

[0015] In order to enable those of ordinary skill in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0016] One or more embodiments of this specification also provide an oil fume purifier detection circuit. The detection circuit may include devices, software, modules, plugins, servers, clients, etc. that use the methods described in the embodiments of this specification and combine necessary implementation hardware. Based on the same innovative concept, the systems in one or more embodiments provided by the embodiments of this specification are as described in the following embodiments. Since the implementation solutions of the systems for solving problems are similar to the methods, the implementation of the specific systems in the embodiments of this specification may refer to the implementation of the foregoing methods, and the repeated parts will not be elaborated. The term "unit" or "module" used hereinafter may be a combination of software and / or hardware that can achieve a predetermined function. Although the systems described in the following embodiments are preferably implemented in software, implementation in hardware or a combination of software and hardware is also possible and contemplated.

[0017] As Figure 1 The figure shows a schematic diagram of the overall structure of an oil fume purifier detection circuit, which includes: A phase error and phase loss detection circuit, including three sub-circuits with the same structure, namely a first sub-circuit, a second sub-circuit, and a third sub-circuit. The input ends of the first sub-circuit, the second sub-circuit, and the third sub-circuit are connected to the three-phase power at the power input end of the oil fume purifier. Each sub-circuit is only connected to one phase of power and outputs a level signal; An undervoltage and overvoltage detection circuit, which is used to convert three-phase power into voltage and current and then perform voltage detection. It includes three voltage detection sub-circuits with the same structure, namely a first voltage detection sub-circuit, a second voltage detection sub-circuit, and a third voltage detection sub-circuit. The input ends of the first voltage detection sub-circuit, the second voltage detection sub-circuit, and the third voltage detection sub-circuit are all connected to the terminal block J41 at the power input end of the oil fume purifier; The controller is connected to the phase error and phase loss detection circuit and is also connected to the undervoltage and overvoltage detection circuit.

[0018] Among them, as Figure 2 shown is the schematic diagram of the phase error and phase loss detection circuit. The first sub-circuit specifically includes: The other end of resistor R17 is connected to the first phase electricity L1. One end of R17 is connected to one end of resistor R16. The other end of resistor R16 is connected to the positive electrode of light-emitting diode D1. The negative electrode of light-emitting diode D1 is respectively connected to the negative electrode of diode D4 and port 1 of optocoupler U4. Port 2 of optocoupler U4 is connected to the positive electrode of diode D4. Port 1 and port 2 of optocoupler U4 are connected by a diode inside optocoupler U4. Port 3 of optocoupler U4 is grounded. Port 4 of optocoupler U4 is respectively connected to one end of resistor R2 and one end of resistor R3. One end of resistor R2 is connected to the 3.3V power supply. The other end of resistor R3 is connected to the I / O detection port in the controller.

[0019] The other two sub-circuits are as Figure 2 shown, with the same structure as the first sub-circuit. The second sub-circuit specifically includes: The other end of resistor R23 is connected to the second phase electricity L2. One end of R23 is connected to one end of resistor R19. The other end of resistor R19 is connected to the positive electrode of light-emitting diode D2. The negative electrode of light-emitting diode D2 is respectively connected to the negative electrode of diode D5 and port 1 of optocoupler U7. Port 2 of optocoupler U7 is connected to the positive electrode of diode D5. Port 1 and port 2 of optocoupler U7 are connected by a diode inside optocoupler U7. Port 3 of optocoupler U7 is grounded. Port 4 of optocoupler U7 is respectively connected to one end of resistor R7 and one end of resistor R8. One end of resistor R7 is connected to the 3.3V power supply. The other end of resistor R8 is connected to the I / O detection port in the controller.

[0020] The third sub-circuit includes: The other end of resistor R30 is connected to the third phase electricity L3. One end of R30 is connected to one end of resistor R25. The other end of resistor R25 is connected to the positive electrode of light-emitting diode D3. The negative electrode of light-emitting diode D3 is respectively connected to the negative electrode of diode D6 and port 1 of optocoupler U8. Port 2 of optocoupler U8 is connected to the positive electrode of diode D6. Port 1 and port 2 of optocoupler U8 are connected by a diode inside optocoupler U8. Port 3 of optocoupler U8 is grounded. Port 4 of optocoupler U8 is respectively connected to one end of resistor R11 and one end of resistor R14. One end of resistor R11 is connected to the 3.3V power supply. The other end of resistor R14 is connected to the I / O detection port in the controller.

[0021] It should be noted that this mainly realizes the detection of phase misalignment and phase loss of three-phase AC power supply with an industrial frequency of 50 Hz and a voltage of AC380V, and has an indicator light function, which can intuitively display the energized state of a certain phase. The high-voltage acquisition part and the low-voltage detection part of this circuit are isolated by optocouplers, and the detection scheme is safe and reliable. This circuit needs to cooperate with an embedded program to realize the detection and judgment of phase misalignment and phase loss. In the figure, L1, L2, and L3 are the three live wires connected to the AC380V alternating current, and L1-CHECK, L2-CHECK, and L3-CHECK are respectively connected to three I / O detection ports of the single-chip microcomputer. Among them, the detection circuits of L1, L2, and L3 are the same. In the L1 phase, R16 and R17 are current-limiting resistors, which limit the current of the light-emitting diode D1 and the photodiode of the optocoupler U4. D4 provides a freewheeling path for the positive and negative half-cycle waveforms of the alternating current. When the positive half-cycle of the sinusoidal AC signal passes through L1 and reaches the conduction voltage of the light-emitting diode, it will cause the light-emitting diode D1 and the photodiode of the optocoupler U4 to conduct. At this time, the light-emitting diode D1 lights up, and the phototransistor at the output end of U4 conducts, pulling the level signal down to GND. Therefore, the L1-CHECK port outputs a low level. When a low level is detected, it means that the voltage of this phase is normal and there is no phase loss. When the negative half-cycle of the sinusoidal AC signal is present, L1 is not conducting, the D1 indicator light is not on, and the L1-CHECK port outputs a high level. When the MCU detects a high level, it judges that there is a phase loss. (Note that all the light-emitting diodes here flash at a frequency greater than 50 Hz, that is, they are on and off alternately. Because it is alternating current, they will only light up when in the positive half-axis and the voltage is greater than the conduction voltage of the diode, and they are not on when in the negative half-axis signal.)

[0022] The misalignment detection of three-phase AC signals is analyzed here. When in the positive phase sequence, the phase order is L1, L2, L3, and the phase difference between adjacent phases is 120 degrees. That is, the phase difference between L1 and L2 is 120 degrees, the phase difference between L2 and L3 is 120 degrees, and the phase difference between L3 and L1 is 120 degrees. When in the positive phase sequence and the AC signals are input into the circuit in the phase order of L1, L2, L3 successively, the output waveform of each optocoupler is a square wave signal of about 50HZ, that is, the period is about 20 milliseconds, and the time period difference between three adjacent square wave signals of L1-CHECK, L2-CHECK, and L3-CHECK remains at about 6 milliseconds (this is mainly related to the conduction voltage drop of the light-emitting diode). When in the reverse phase sequence, if the phase order is L1, L3, L2, the phase difference between adjacent phases is also 120 degrees, but it becomes that the phase difference between L1 and L3 is 120 degrees, the phase difference between L3 and L2 is 120 degrees, and the phase difference between L2 and L1 is 120 degrees. When in the reverse phase sequence and the AC signals are input into the circuit in the phase order of L1, L3, L2 successively, the output waveform of each optocoupler is still a square wave signal of about 50HZ, that is, the period is about 20 milliseconds. At this time, the time period difference between three adjacent square wave signals of L1-CHECK, L3-CHECK, and L2-CHECK is about 6 milliseconds, but the time period difference between the square wave signals of L1-CHECK and L2-CHECK becomes about 13 milliseconds. To sum up, by detecting the time difference of the square wave signals between two phases and then comparing it with the preset standard phase information through the program, the misalignment of the phase sequence of the three-phase AC voltage can be identified.

[0023] As Figure 3 shown is the structural schematic diagram of the under-voltage and over-voltage detection circuit. The first voltage detection sub-circuit in the under-voltage and over-voltage detection circuit specifically includes: Port 2 of relay U5 is respectively connected to port 1 of terminal block J41 and the input terminal of the first voltage signal acquisition circuit. Port 1 of relay U5 is connected to port 3 of current transformer CT1. Port 4 of current transformer CT1 is connected to port 1 of terminal block J42. Terminal block J42 is used to output a three-phase 380V power supply to the working unit of the oil fume purifier. Port 3 of relay U5 is respectively connected to a 12V power supply, the negative pole of diode D3 and one end of resistor R21. The other end of resistor R21 is connected to the positive pole of light-emitting diode LED2. The positive pole of diode D3 and the negative pole of light-emitting diode LED2 are both connected to port 4 of relay U5. Port 4 of relay U5 is also connected to the controller. Port 2 and port 1 of current transformer CT1 are both connected to the input terminal of the first differential signal sampling circuit. The output terminal of the first voltage signal acquisition circuit and the output terminal of the first differential signal sampling circuit are both connected to voltage and current detection chip U1. Voltage and current detection chip U1 is also connected to the controller.

[0024] Among them, the first voltage signal acquisition circuit specifically includes: Port 1 of current transformer T1 is connected to the power supply module. Port 2 of current transformer T1 is sequentially connected to port 2 of relay U5 through resistor R19 and resistor R12. Port 4 of current transformer T1 is connected to voltage and current detection chip U1 through resistor R13. Port 4 of current transformer T1 is also connected to port 3 of current transformer T1 through resistor R17. Port 3 of current transformer T1 is also grounded.

[0025] The first differential signal sampling circuit includes: One end of resistor R1 and one end of resistor R4 are both connected to port 2 of current transformer CT1. The other end of resistor R4 and one end of resistor R7 are both connected to port 1 of current transformer CT1. The other end of resistor R1 is respectively connected to the other end of capacitor C4 and voltage and current detection chip U1. The other end of resistor R7 is respectively connected to the other end of capacitor C7 and voltage and current detection chip U1. One end of capacitor C4 and one end of capacitor C7 are both grounded.

[0026] The other two sub-circuits in the under-voltage and over-voltage detection circuit are as Figure 3 shown, and both have the same structure as the first voltage detection sub-circuit. Among them, the second voltage detection sub-circuit specifically includes: Port 2 of relay U10 is respectively connected to port 2 of terminal block J41 and the input end of the second voltage signal acquisition circuit. Port 1 of relay U10 is connected to port 3 of current transformer CT4. Port 4 of current transformer CT4 is connected to port 2 of terminal block J42. Port 3 of relay U10 is respectively connected to a 12V power supply, the negative pole of diode D6, and one end of resistor R49. The other end of resistor R49 is connected to the positive pole of light-emitting diode LED4. The positive pole of diode D6 and the negative pole of light-emitting diode LED4 are both connected to port 4 of relay U10. Port 4 of relay U5 is also connected to the controller. Port 2 and port 1 of current transformer CT4 are both connected to the input end of the second differential signal sampling circuit. The output ends of the second voltage signal acquisition circuit and the second differential signal sampling circuit are both connected to voltage and current detection chip U7.

[0027] Among them, the second voltage signal acquisition circuit specifically includes: Port 1 of current transformer T2 is connected to the power supply module. Port 2 of current transformer T2 is sequentially connected to port 2 of relay U10 through resistor R43 and resistor R40. Port 4 of current transformer T2 is connected to voltage and current detection chip U1 through resistor R38. Port 4 of current transformer T2 is also connected to port 3 of current transformer T2 through resistor R44. Port 3 of current transformer T2 is also grounded.

[0028] The second differential signal sampling circuit includes: One end of resistor R29 and one end of resistor R35 are both connected to port 2 of current transformer CT4. The other end of resistor R35 and one end of resistor R37 are both connected to port 1 of current transformer CT4. The other end of resistor R29 is respectively connected to the other end of capacitor C16 and voltage and current detection chip U7. The other end of resistor R37 is respectively connected to the other end of capacitor C19 and voltage and current detection chip U7. One end of capacitor C16 and one end of capacitor C19 are both grounded.

[0029] The third voltage detection sub-circuit specifically includes: Port 2 of relay U14 is respectively connected to port 3 of terminal block J41 and the input end of the third voltage signal acquisition circuit. Port 1 of relay U14 is connected to port 3 of current transformer CT7. Port 4 of current transformer CT7 is connected to port 3 of terminal block J42. Port 3 of relay U14 is respectively connected to a 12V power supply, the negative pole of diode D11 and one end of resistor R66. The other end of resistor R66 is connected to the positive pole of light-emitting diode LED7. The positive pole of diode D11 and the negative pole of light-emitting diode LED7 are both connected to port 4 of relay U14. Port 4 of relay U14 is also connected to the controller. Port 2 and port 1 of current transformer CT7 are both connected to the input end of the third differential signal sampling circuit. The output end of the third voltage signal acquisition circuit and the output end of the third differential signal sampling circuit are both connected to voltage and current detection chip U11.

[0030] Among them, the third voltage signal acquisition circuit specifically includes: Port 1 of current transformer T3 is connected to the power supply module. Port 2 of current transformer T3 is sequentially connected to port 2 of relay U14 through resistor R64 and resistor R59. Port 4 of current transformer T3 is connected to voltage and current detection chip U11 through resistor R60. Port 4 of current transformer T3 is also connected to port 3 of current transformer T3 through resistor R65. Port 3 of current transformer T3 is also grounded.

[0031] The third differential signal sampling circuit includes: One end of resistor R52 and one end of resistor R54 are both connected to port 2 of current transformer CT7. The other end of resistor R54 and one end of resistor R57 are both connected to port 1 of current transformer CT7. The other end of resistor R52 is respectively connected to the other end of capacitor C26 and voltage and current detection chip U11. The other end of resistor R57 is respectively connected to the other end of capacitor C29 and voltage and current detection chip U11. One end of capacitor C26 and one end of capacitor C29 are both grounded.

[0032] The under-voltage and over-voltage detection circuit further includes a neutral line switch circuit, as Figure 4 shown in the structural schematic diagram of the neutral line switch circuit. The neutral line switch circuit specifically includes; Port 2 of relay U15 is connected to the neutral line end in terminal block J41. Port 1 of relay U15 is connected to the neutral line of the oil fume purifier. Port 3 of relay U15 is respectively connected to a 12V power supply, the negative pole of diode D15 and one end of resistor R72. The other end of resistor R72 is connected to the positive pole of light-emitting diode LED11. Port 4 of relay U15, the positive pole of diode D15 and the negative pole of light-emitting diode LED11 are all connected to the controller.

[0033] Among them, the current transformer can convert high-voltage current into low-voltage current to make it meet the acquisition range of the voltage and current detection chip. On the other hand, the isolation between high-voltage and low-voltage is achieved through the current transformer to realize isolated sampling. The differential signal sampling circuit can let the current pass through the sampling resistor and form an AC voltage signal on the resistor, and then sample through the differential circuit. The voltage signal acquisition circuit limits the current through two resistors to make the input current of the voltage transformer within the limited range. Using two resistors is considered because the withstand voltage of ordinary resistors is generally 220V, so voltage division is required. Then the output of the voltage transformer forms a voltage signal that meets the acquisition range through a resistor, and another resistor is used to prevent the input current from being too large and to achieve the isolation between high-voltage and low-voltage.

[0034] On the other hand, based on the above detection circuit, the embodiment of the present application also provides a method for detecting an oil fume purifier, as Figure 5 shown in the flowchart of the method for detecting an oil fume purifier: S501. Collect three-phase information at the power input end of the oil fume purifier through the phase error and phase loss detection circuit, and at the same time collect voltage information at the power input end of the oil fume purifier according to the undervoltage and overvoltage detection circuit.

[0035] S502. Compare the three-phase information with the preset standard phase information to obtain a first comparison result, and at the same time compare the voltage information with the preset standard voltage information to obtain a second comparison result.

[0036] S503. Determine the phase state and voltage state according to the first comparison result and the second comparison result.

[0037] In the embodiment of the present application, the three-phase information is specifically the time difference of the square wave signals between two adjacent phases The specific embodiments of this specification have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve the desired result. Additionally, the processes depicted in the figures do not necessarily require the specific order or sequential order shown to achieve the desired result. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0038] The embodiments of this specification are not limited to those that must conform to industry communication standards, standard computer resource data update and data storage rules, or the situations described in one or more embodiments of this specification. Certain industry standards or implementation schemes slightly modified on the basis of the implementation described by using a custom method or embodiment can also achieve the same, equivalent or similar, or predictable implementation effects after deformation as those of the above embodiments. The embodiments obtained by applying these modified or deformed data acquisition, storage, judgment, processing methods, etc. still fall within the scope of the optional implementation schemes of the embodiments of this specification.

[0039] The controller can be implemented in any suitable manner. For example, the controller can take the form of, for example, a microprocessor or a processor and a computer-readable medium storing computer-readable program code (such as software or firmware) executable by the (micro)processor, logic gates, switches, application specific integrated circuit (ASIC), programmable logic controller, and embedded microcontroller. Examples of the controller include, but are not limited to, the following microcontrollers: arc 625d, atmel at91sam, microchip pic18f26k20, and silicone labs c8051f320. The memory controller can also be implemented as part of the control logic of the memory. Those skilled in the art also know that in addition to implementing the controller in the form of pure computer-readable program code, the method steps can be logically programmed to enable the controller to implement the same function in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, such a controller can be regarded as a hardware component, and the devices included therein for implementing various functions can also be regarded as the structures within the hardware component. Or even, the devices for implementing various functions can be regarded as either software modules for implementing the method or the structures within the hardware component.

[0040] The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or plugins can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0041] These computer program instructions can also be loaded onto a computer or other programmable resource data update device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide for implementing the process Figure 1 in one process or multiple processes and / or boxes Figure 1 steps for the functions specified in one box or multiple boxes.

[0042] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the description of the method embodiment. In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this specification. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0043] Those of ordinary skill in the art will realize that the embodiments described herein are for helping the reader understand the principles of the present invention, and it should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific deformations and combinations that do not depart from the essence of the present invention based on the technical revelations disclosed in the present invention, and these deformations and combinations are still within the protection scope of the present invention.

Claims

1. An oil fume purifier detection circuit, characterized in that, The detection circuit includes: A phase error and phase loss detection circuit, which includes three sub-circuits with the same structure, namely the first sub-circuit, the second sub-circuit, and the third sub-circuit. The input ends of the first sub-circuit, the second sub-circuit, and the third sub-circuit are connected to the three-phase power at the power input end of the oil fume purifier. Each sub-circuit is only connected to one phase of the power and outputs a level signal. An undervoltage and overvoltage detection circuit, which is used to convert the three-phase power into voltage and current and then perform voltage detection. It includes three voltage detection sub-circuits with the same structure, namely the first voltage detection sub-circuit, the second voltage detection sub-circuit, and the third voltage detection sub-circuit. The input ends of the first voltage detection sub-circuit, the second voltage detection sub-circuit, and the third voltage detection sub-circuit are all connected to the terminal block J41 at the power input end of the oil fume purifier. A controller, which is connected to the phase error and phase loss detection circuit and is also connected to the undervoltage and overvoltage detection circuit.

2. The detection circuit of the fume purifier according to claim 1, wherein The first sub-circuit specifically includes: The other end of the resistor R17 is connected to the first phase of the power L1. One end of the R17 is connected to one end of the resistor R16. The other end of the resistor R16 is connected to the positive pole of the light-emitting diode D1. The negative pole of the light-emitting diode D1 is respectively connected to the negative pole of the diode D4 and the port 1 of the optocoupler U4. The port 2 of the optocoupler U4 is connected to the positive pole of the diode D4. The port 1 and port 2 of the optocoupler U4 are connected by a diode inside the optocoupler U4. The port 3 of the optocoupler U4 is grounded. The port 4 of the optocoupler U4 is respectively connected to one end of the resistor R2 and one end of the resistor R3. One end of the resistor R2 is connected to the 3.3V power supply. The other end of the resistor R3 is connected to the I / O detection port in the controller.

3. The detection circuit of the fume purifier according to claim 2, wherein The port 2 of the optocoupler in the first sub-circuit, the port 2 of the optocoupler in the second sub-circuit, and the port 2 of the optocoupler in the third sub-circuit are interconnected.

4. The oil fume purifier detection circuit according to claim 1, wherein, The first voltage detection sub-circuit specifically includes: The port 2 of the relay U5 is respectively connected to the port 1 of the terminal block J41 and the input end of the first voltage signal acquisition circuit. The port 1 of the relay U5 is connected to the port 3 of the current transformer CT1. The port 4 of the current transformer CT1 is connected to the port 1 of the terminal block J42, and the terminal block J42 is used to output three-phase 380V power to the working unit of the oil fume purifier. The port 3 of the relay U5 is respectively connected to the 12V power supply, the negative pole of the diode D3, and one end of the resistor R21. The other end of the resistor R21 is connected to the positive pole of the light-emitting diode LED2. The positive pole of the diode D3 and the negative pole of the light-emitting diode LED2 are both connected to the port 4 of the relay U5. The port 4 of the relay U5 is also connected to the controller. The port 2 and port 1 of the current transformer CT1 are both connected to the input end of the first differential signal sampling circuit. The output end of the first voltage signal acquisition circuit and the output end of the first differential signal sampling circuit are both connected to the voltage and current detection chip U1. The voltage and current detection chip U1 is also connected to the controller.

5. The detection circuit of the fume purifier according to claim 1, wherein The under-voltage and over-voltage detection circuit further includes a neutral line switch circuit, and specifically, the neutral line switch circuit includes: The port 2 of the relay U15 is connected to the neutral line end in the terminal block J41, the port 1 of the relay U15 is connected to the neutral line of the oil fume purifier, the port 3 of the relay U15 is respectively connected to the 12V power supply, the negative electrode of the diode D15 and one end of the resistor R72, the other end of the resistor R72 is connected to the positive electrode of the light-emitting diode LED11, and the port 4 of the relay U15, the positive electrode of the diode D15 and the negative electrode of the light-emitting diode LED11 are all connected to the controller.

6. A method for detecting an oil fume purifier, characterized in that, Applied to the detection circuit according to any one of claims 1-5, the method includes: Collecting three-phase information at the power input end of the oil fume purifier through the phase error and phase loss detection circuit, and at the same time collecting voltage information at the power input end of the oil fume purifier according to the under-voltage and over-voltage detection circuit; Comparing the three-phase information with the preset standard phase information to obtain a first comparison result, and at the same time comparing the voltage information with the preset standard voltage information to obtain a second comparison result; Determining the phase state and voltage state according to the first comparison result and the second comparison result.

7. The method for detecting an oil fume purifier according to claim 6, wherein The three-phase information is specifically the time difference of the square wave signals between two adjacent phases.

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