CN220933064U - Fault detection circuit and smoke exhaust ventilator - Google Patents

Abstract

The application relates to a fault detection circuit and a range hood, wherein the range hood comprises a plurality of loads, and the fault detection circuit comprises: the device comprises a plurality of load current detection modules, a control module and a wireless transmission module; wherein: the load current detection modules are the same as the loads in number; one end of any load current detection module is connected with a corresponding load, and the other end of the load current detection module is connected with a corresponding load detection signal input end of the control module; the wireless transmission module is connected with the wireless signal transmission end of the control module. Through setting up a load current detection module to every load to whether the electric current of this detection a plurality of loads is normal, and through setting up wireless transmission module, when the load breaks down, can be timely corresponding trouble information send to cloud in the server, thereby make the maintenance personal can be timely judgement which load trouble, improved maintenance efficiency and user experience.

Description

Fault detection circuit and smoke exhaust ventilator

Technical Field

The application relates to the technical field of smoke exhaust ventilators, in particular to a fault detection circuit and a smoke exhaust ventilator.

Background

Along with the development and improvement of the scientific and technical level, the influence of the household appliances on the life of residents is also larger and larger, and once the household appliances break down, the life of the residents is greatly inconvenient, and after-sales maintenance personnel are required to maintain in time.

For example, after a range hood has been in use for a period of time, some malfunction may occur. The traditional smoke ventilator has no fault self-checking function, or the self-checking fault is not comprehensive enough, and the smoke ventilator is provided with a plurality of loads, so that when the smoke ventilator breaks down, the reason of the specific load fault cannot be judged in time, maintenance personnel are required to judge after the on-site detection, the maintenance efficiency is reduced, and the user experience is influenced.

Disclosure of utility model

Based on this, it is necessary to provide a malfunction detection circuit and a range hood that can remotely detect a load malfunction.

In a first aspect, the present application provides a fault detection circuit for a range hood, the range hood including a plurality of loads, the fault detection circuit comprising: the device comprises a plurality of load current detection modules, a control module and a wireless transmission module; wherein: the load current detection modules are the same as the loads in number; one end of any load current detection module is connected with the corresponding load, and the other end of the load current detection module is connected with the corresponding load detection signal input end of the control module; the wireless transmission module is connected with the wireless signal transmission end of the control module.

In one embodiment, the load comprises an ac load, and the load current detection module comprises: the alternating load current detection module, the load detection signal input end includes: the alternating load current detection modules are the same as the alternating load and the alternating load signal input ends in number; one end of the alternating load current detection module is connected with the corresponding alternating load, and the other end of the alternating load current detection module is connected with the corresponding alternating load signal input end.

In one embodiment, the ac load current detection module includes: the current transformer comprises a current transformer, a first resistor, a second resistor and a rectifier diode, wherein an input port of the current transformer is connected with an alternating current load, an output port of the current transformer is respectively connected with the first resistor and the second resistor in parallel, an anode of the rectifier diode is connected with the first resistor, and a cathode of the rectifier diode is respectively connected with the second resistor and an alternating current load signal input end.

In one embodiment, the load comprises a dc load, and the load current detection module comprises: the direct current load current detection module, the load detection signal input end includes: the direct current load current detection modules are the same as the direct current loads and the direct current load signal input ends in number; one end of the direct current load current detection module is connected with the corresponding direct current load, and the other end of the direct current load current detection module is connected with the corresponding direct current load signal input end.

In one embodiment, the dc load current detection module includes: and one end of the sampling resistor is respectively connected with the direct current load and the direct current load signal input end, and the other end of the sampling resistor is grounded.

In one embodiment, the fault detection circuit further comprises: the direct-current voltage detection module is characterized in that one end of the direct-current voltage detection module is connected with the switching power supply, and the other end of the direct-current voltage detection module is connected with the direct-current voltage signal input end of the control module.

In one embodiment, the dc voltage detection module includes: the third resistor is connected with the fourth resistor in series, one end of the third resistor is connected with the switching power supply, the other end of the third resistor is connected with the direct-current voltage signal input end, one end of the fourth resistor is connected with the third resistor, and the other end of the fourth resistor is grounded.

In one embodiment, the fault detection circuit further comprises: the display module is connected with the display signal transmission end of the control module.

In one embodiment, the control module includes: a main control unit and a display control unit, the main control unit comprising: the load detection signal input terminal, the display control unit includes: a wireless signal transmission end and a display signal transmission end.

In a second aspect, the application further provides a range hood, which comprises the fault detection circuit in the embodiment of the first aspect.

Above-mentioned fault detection circuit and smoke ventilator through all setting up a load current detection module to every load to whether the electric current of this detection a plurality of loads is normal, and through setting up wireless transmission module, when the load breaks down, can be timely corresponding fault information send to in the cloud ware, thereby make the judgement that maintainer can be timely is which load trouble, improved maintenance efficiency and user experience.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a schematic diagram of a fault detection circuit according to an embodiment;

FIG. 2 is a schematic diagram of a fault detection circuit under an embodiment for AC load;

FIG. 3 is a schematic diagram of a fault detection circuit according to an embodiment;

FIG. 4 is a schematic diagram of a fault detection circuit under a DC load according to an embodiment;

FIG. 5 is a schematic block diagram of a fault detection circuit according to another embodiment;

FIG. 6 is a block diagram of a control module according to an embodiment;

reference numerals illustrate:

100. A load; 200. a load current detection module; 300. a control module; 400. a wireless transmission module; 500. a direct current voltage detection module; 600. a display module; 110. an alternating current load; 120. a direct current load; 210. an alternating load current detection module; 220. a direct current load current detection module; 221. a motor current detection module; 222. an illumination current detection module; 310. a main control unit; 320. and a display control unit.

Detailed Description

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, the first resistor R1 may be referred to as a second resistor R2, and similarly, the second resistor R2 may be referred to as the first resistor R1, without departing from the scope of the present application. Both the first resistor R1 and the second resistor R2 are resistors, but they are not the same resistor.

It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.

In one embodiment, as shown in fig. 1, the present application proposes a fault detection circuit applied to a range hood, the range hood including a plurality of loads 100, the fault detection circuit comprising: a plurality of load current detection modules 200, a control module 300, and a wireless transmission module 400; wherein: the number of load current detection modules 200 is the same as the number of loads 100; one end of any load current detection module 200 is connected with the corresponding load 100, and the other end is connected with the corresponding load detection signal input end of the control module 300; the wireless transmission module 400 is connected to the wireless signal transmission end of the control module 300.

Specifically, referring to fig. 1, the number of loads 100 in the range hood may be N, for example, load 1, load 2, … …, load N, load 100 may be a circuit module or device using alternating current and/or direct current, for example, load 100 may be a motor, a motor driving circuit, a lighting circuit, or the like. The number of the load current detection modules 200 is equal to the number of the loads 100, and the load current detection modules 200 are N, and each load current detection module 200 is connected to a corresponding load 100 and is used for sampling the current input into the corresponding load 100, and then sending the sampled signal to the load detection signal input end in the control module 300. For example, in the figures, one ends of the load current detection module 1, the load current detection modules 2, … …, and the load current detection module N are respectively connected to the load 1, the load 2, … …, and the load N, and the other ends are respectively connected to the load detection signal input terminal 1, the load detection signal input terminal 2, … …, and the load detection signal input terminal N in the control module 300. The control module 300 receives the detection signals through different load detection signal input ends, and judges whether the corresponding detection signals are normal according to the built-in program, so as to judge whether the corresponding load 100 is abnormal, generate corresponding fault codes according to the abnormal conditions, and send the fault codes to the wireless transmission module 400 through the wireless signal transmission end. After the wireless transmission module 400 receives the fault code, the fault code is sent to the cloud server in a wireless transmission mode, and a maintainer obtains the corresponding fault code through an after-sale information system or a mobile terminal, so that which load 100 is faulty is timely judged, maintenance preparation is made in advance, maintenance efficiency is improved, and user experience is optimized.

In one embodiment, as shown in fig. 2, the load 100 includes an ac load 110, and the load current detection module 200 includes: the ac load current detection module 210, the load detection signal input terminal includes: the number of the ac load signal input terminals, the ac load current detection module 210, the ac load 110 and the ac load signal input terminals are the same; one end of the ac load current detection module 210 is connected to the corresponding ac load 110, and the other end of the ac load current detection module 210 is connected to the corresponding ac load signal input end.

Specifically, referring to fig. 2, the number of ac loads 110 in the range hood may be M, for example, ac load 1, ac load 2, … …, and ac load M, and the corresponding load current detection modules 200 also include M ac load current detection modules 210, for example, ac load current detection modules 1, 2, … …, and M ac load signal inputs, for example, ac load signal input 1, ac load signal input 2, … …, and ac load signal input M. The ac load 110, the ac load current detection module 210 and the ac load signal input terminal are connected in one-to-one correspondence. It is understood that M.ltoreq.N. By providing the ac load current detection module 210, an ac signal applied to the ac load 110 may be sampled, and the ac signal sampling result may be sent to the control module 300 through the ac load signal input end, where the control module 300 may determine whether the corresponding ac load 110 has a fault through a corresponding signal processing procedure.

In one embodiment, as shown in FIG. 3, the AC load current detection module 210 includes: the current transformer T1, the first resistor R1, the second resistor R2 and the rectifier diode D1, wherein an input port of the current transformer T1 is connected with the alternating current load 110, an output port of the current transformer T1 is respectively connected with the first resistor R1 and the second resistor R2 in parallel, an anode of the rectifier diode D1 is connected with the first resistor R1, and a cathode of the rectifier diode D1 is respectively connected with the second resistor R2 and an alternating current load signal input end.

Specifically, the current transformer T1 of the embodiment of the present application may step down the ac voltage on the ac power line, so that the magnitude of the ac load current signal output by the ac load current detection module 210 meets the requirement of the control module 300, and the rectifier diode D1 is used to rectify the ac current into the dc current. In a specific example, let the detected current value be I, according to the primary/secondary winding turns ratio (constant) C fixed by the current transformer T1, the output current (ac) ia=i/C can be determined, and when the first resistor R1 is selected, the resistance value is far smaller than the resistance value of the second resistor R2, where the resistance value of the first resistor R1 is approximately equal to the actual load resistance value. Therefore, the voltage ua=r1×ia= (r1×i)/C across the first resistor R1 is the value of the ac current, and after half-wave rectification by the rectifying diode D1, the dc voltage v1= (v2/2) ×ua= (0.707×r1×i)/C between the negative pole of the rectifying diode D1 and the ground is subtracted from the voltage drop V3 across the rectifying diode D1, so as to obtain the voltage value v2=v1-v3= [ (0.707×r1×i)/C-V3 ] across the second resistor R2, which is the analog of the ac load current signal finally input to the ac load signal input terminal (pin 8) of the control module 300. Only a circuit including one ac load current detection module 210 is illustrated in fig. 3, and in some other embodiments, the ac current signal of other ac loads 110 may be detected by the same circuit.

In one embodiment, as shown in fig. 3, the ac load current detection module 210 further includes: and the filter capacitor C1 is connected with the second resistor R2 in parallel. Specifically, by setting the filter capacitor C1, an ac component in the ac load current signal may be further filtered, so as to reduce the influence of the ac signal on the control module 300.

In one embodiment, as shown in fig. 4, the load 100 includes a dc load 120, and the load current detection module 200 includes: the dc load current detection module 220, the load detection signal input terminal includes: the number of the direct current load signal input ends, the direct current load current detection module 220 and the direct current load 120 are the same; one end of the dc load current detection module 220 is connected to the corresponding dc load 120, and the other end of the dc load current detection module 220 is connected to the corresponding dc load signal input end.

Specifically, referring to fig. 4, the number of dc loads 120 in the range hood may be L, for example, dc load 1, dc loads 2, … …, and dc load L, and the corresponding load current detection modules 200 also include L dc load current detection modules 220, for example, dc load current detection modules 1, dc load current detection modules 2, … …, and dc load current detection modules L, and the control module 300 also includes L dc load signal inputs, for example, dc load signal input 1, dc load signal input 2, … …, and dc load signal input L. The dc load 120, the dc load current detection module 220, and the dc load signal input are connected in a one-to-one correspondence. It is understood that l.ltoreq.n, when the load 100 includes the dc load 120 and the ac load 110, l+m=n. By providing the dc load current detection module 220, the dc signal applied to the dc load 120 can be sampled, and the dc signal sampling result is sent to the control module 300 through the dc load signal input end, and the control module 300 can determine whether the corresponding dc load 120 has a fault through a corresponding signal processing procedure.

In one embodiment, the direct load current detection module 220 includes: and one end of the sampling resistor is respectively connected with the direct current load 120 and the direct current load signal input end, and the other end of the sampling resistor is grounded.

Specifically, as shown in fig. 3, when the dc load 120 is a motor driving module and the dc load current detecting module 220 is used for detecting the motor current, the dc load current detecting module 220 is a motor current detecting module 221, wherein the fifth resistor R5 is a sampling resistor, one end of the fifth resistor R5 is respectively connected to the motor driving module and the control module 300, and the other end of the fifth resistor R5 is grounded. The motor driving module comprises a motor driving chip U1 and a motor M1, the motor driving chip U1 is connected with the control module 300, and the current output on the CS pin of the motor driving chip U1 is collected by setting a fifth resistor R5 so as to obtain a driving current signal, and after the driving current signal is obtained by a direct current load signal input end (pin 4) of the control module 300, whether the current is abnormal or not during motor driving can be detected.

When the dc load 120 is an illumination module and the dc load current detection module 220 is used for detecting illumination current, the dc load current detection module 220 is an illumination current detection module 222, wherein the sixth resistor R6 is a sampling resistor, one end of the sixth resistor R6 is respectively connected to the illumination module and the control module 300, and the other end of the sixth resistor R6 is grounded. The lighting module comprises a plurality of LED lamps and a triode Q1, the triode Q1 is controlled to be on-off by the control module 300, a sixth resistor R6 is connected with the triode Q1 in series, lighting current signals can be acquired through the arrangement of the sixth resistor R6 and input into a direct current load signal input end (pin 5) of the control module 300, and the control module 300 can judge whether the lighting module is abnormal or not by detecting the size of the lighting current signals.

In one embodiment, as shown in fig. 5, the fault detection circuit further includes: the direct-current voltage detection module 500, one end of the direct-current voltage detection module 500 is connected with the switching power supply, and the other end of the direct-current voltage detection module 500 is connected with the direct-current voltage signal input end of the control module 300. Specifically, the switching power supply is used for rectifying and reducing the voltage of alternating current input by the alternating current power transmission line and then outputting the working voltage of direct current. For example, an operating voltage of 12V or 5V is output. One end of the direct current voltage detection module 500 is connected with the switching power supply and is used for sampling the direct current working voltage, so that a direct current voltage signal is obtained, the control module 300 can judge whether the direct current working voltage output by the switching power supply is normal or not through the direct current voltage signal input end, and a corresponding fault code is generated when the direct current working voltage is abnormal, so that the fault reason is prompted.

In one embodiment, as shown in fig. 3, the dc voltage detection module 500 includes: the third resistor R3 and the fourth resistor R4 are connected in series, one end of the third resistor R3 is connected with the switching power supply, the other end of the third resistor R3 is connected with the direct-current voltage signal input end, one end of the fourth resistor R4 is connected with the third resistor R3, and the other end of the fourth resistor R4 is grounded. Specifically, the third resistor R3 is used for voltage division, the fourth resistor R4 is used for current sampling, the direct-current voltage signal is collected through the fourth resistor R4 and is input into the direct-current voltage signal input end (pin 7) of the control module 300, and the control module 300 can output a corresponding fault code under the condition that the fluctuation of the direct-current voltage signal is detected to exceed 10%. It will be appreciated that in this embodiment, a 12V operating voltage is detected, and in some other embodiments, the same circuit may be used to detect whether a 5V operating voltage has failed.

In one embodiment, as shown in fig. 5, the fault detection circuit further includes: the display module 600, the display module 600 connects the display signal transmission end of the control module 300. Specifically, after the control module 300 of the embodiment of the present application generates a corresponding fault code, the fault code is sent to the display module 600 through the display signal transmission end at the same time, and after the display module 600 matches through the built-in program, the location where the fault occurs can be determined, and the corresponding fault information is displayed. The display module 600 may also perform some functional instruction acquisition by touching or pressing a button.

In one embodiment, as shown in FIG. 6, the control module 300 includes: a main control unit 310 and a display control unit 320, the main control unit 310 including: the load detection signal input terminal, the display control unit 320 includes: a wireless signal transmission end and a display signal transmission end. Specifically, the control module 300 in the embodiment of the present application is composed of two micro control units (Microcontroller Unit, MCU), that is, a main control unit 310 and a display control unit 320, where the main control unit 310 is connected to the display control unit 320 in a communication manner, and by setting two MCUs to perform fault detection and wireless transmission, respectively, the signal processing speed can be improved.

In one embodiment, as shown in fig. 3, the interface J3 is used for connecting the motor M1, the pin 9, the pin 10 and the pin 11 of the control module 300 are used for respectively controlling the rotation speed of the motor M1 to be high, medium and low, the interface J4 is used for connecting the heating film, and the pin 12 of the control module 300 is used for outputting corresponding signals to control the working state of the heating film.

In one embodiment, the application further provides a range hood, which comprises the fault detection circuit in the embodiment. Through setting up a load current detection module 200 to every load 100 to whether the electric current of a plurality of loads 100 is normal is detected to through setting up wireless transmission module 400, when load 100 breaks down, can be timely corresponding trouble information send to cloud server in, thereby make the maintenance personal can be timely judge which load 100 breaks down, improved maintenance efficiency and user experience.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "other embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. A fault detection circuit for a range hood, the range hood comprising a plurality of loads, the fault detection circuit comprising: the device comprises a plurality of load current detection modules, a control module and a wireless transmission module; wherein:

the load current detection modules are the same as the loads in number;

One end of any load current detection module is connected with the corresponding load, and the other end of the load current detection module is connected with the corresponding load detection signal input end of the control module;

the wireless transmission module is connected with the wireless signal transmission end of the control module.

2. The fault detection circuit of claim 1, wherein the load comprises an ac load, and the load current detection module comprises: the alternating load current detection module, the load detection signal input end includes: the alternating load current detection modules are the same as the alternating load and the alternating load signal input ends in number;

One end of the alternating load current detection module is connected with the corresponding alternating load, and the other end of the alternating load current detection module is connected with the corresponding alternating load signal input end.

3. The fault detection circuit of claim 2, wherein the ac load current detection module comprises: the current transformer comprises a current transformer, a first resistor, a second resistor and a rectifier diode, wherein an input port of the current transformer is connected with an alternating current load, an output port of the current transformer is respectively connected with the first resistor and the second resistor in parallel, an anode of the rectifier diode is connected with the first resistor, and a cathode of the rectifier diode is respectively connected with the second resistor and an alternating current load signal input end.

4. The fault detection circuit of claim 1, wherein the load comprises a dc load, and the load current detection module comprises: the direct current load current detection module, the load detection signal input end includes: the direct current load current detection modules are the same as the direct current loads and the direct current load signal input ends in number;

One end of the direct current load current detection module is connected with the corresponding direct current load, and the other end of the direct current load current detection module is connected with the corresponding direct current load signal input end.

5. The fault detection circuit of claim 4, wherein the dc load current detection module comprises: and one end of the sampling resistor is respectively connected with the direct current load and the direct current load signal input end, and the other end of the sampling resistor is grounded.

6. The fault detection circuit of claim 1, further comprising: the direct-current voltage detection module is characterized in that one end of the direct-current voltage detection module is connected with the switching power supply, and the other end of the direct-current voltage detection module is connected with the direct-current voltage signal input end of the control module.

7. The fault detection circuit of claim 6, wherein the dc voltage detection module comprises: the third resistor is connected with the fourth resistor in series, one end of the third resistor is connected with the switching power supply, the other end of the third resistor is connected with the direct-current voltage signal input end, one end of the fourth resistor is connected with the third resistor, and the other end of the fourth resistor is grounded.

8. The fault detection circuit of claim 1, further comprising: the display module is connected with the display signal transmission end of the control module.

9. The fault detection circuit of claim 8, wherein the control module comprises: a main control unit and a display control unit, the main control unit comprising: the load detection signal input terminal, the display control unit includes: a wireless signal transmission end and a display signal transmission end.

10. A range hood comprising the fault detection circuit of any one of claims 1 to 9.