Dust deposition degree detection circuit, circuit board and switching power supply

Abstract

The utility model discloses a dust deposition degree detection circuit, a circuit board and a switching power supply. The ash deposition degree detection circuit comprises a detection module, a voltage output port, at least one light emitting module and light receiving modules in one-to-one correspondence with the light emitting modules. The detection module comprises a divider resistor and a detection resistor corresponding to each light receiving module; the first end of each light emitting module is connected with a first power supply, and the second end of each light emitting module is grounded; each light emitting module emits a light beam, and each light receiving module receives the light beam emitted by the corresponding light emitting module; the first end of each optical receiving module is connected with the first end of the divider resistor; the second end of each light receiving module is connected to the first common point through the corresponding detection resistor; one of the second end of the divider resistor and the first common point is connected with a second power supply, and the other is grounded; the voltage output port is connected with the first end of the divider resistor; the voltage output port is used for outputting a sensing value.

Description

Technical Field

[0001] This utility model belongs to the field of electronic circuit technology, and in particular relates to a dust accumulation detection circuit, circuit board and switching power supply. Background Technology

[0002] Uninterruptible power supplies (UPS) and inverters generate heat during operation. To ensure their proper functioning, timely and effective heat dissipation is essential. This is typically achieved by installing cooling channels, air inlets, and outlets on the equipment to expel heat. However, this airflow process can also introduce dust into the equipment. As the equipment operates in complex environments, dust accumulates on the circuit boards. This accumulated dust can impair heat dissipation, interfering with normal circuit operation and potentially leading to equipment malfunction. Utility Model Content

[0003] This utility model provides a dust accumulation detection circuit, a circuit board, and a switching power supply to accurately detect the dust accumulation level on the circuit board.

[0004] A first aspect of this utility model provides a dust accumulation detection circuit, including a detection module, a voltage output port, at least one light emitting module, and a light receiving module corresponding to each light emitting module; the detection module includes a voltage divider resistor and a detection resistor corresponding to each light receiving module;

[0005] The first end of each optical emitting module is used to connect to the first power supply, and the second end of each optical emitting module is used to ground; each optical emitting module emits a light beam, and each optical receiving module receives the light beam emitted by the corresponding optical emitting module.

[0006] The first end of each optical receiving module is connected to the first end of the voltage divider resistor; the second end of each optical receiving module is connected to the first common point through its corresponding detection resistor; one of the second end of the voltage divider resistor and the first common point is used to connect to the second power supply, and the other is used to ground.

[0007] The voltage output port is connected to the first end of the voltage divider resistor; wherein, the voltage output port is used to output the sensed value.

[0008] In one embodiment, each optical emitting module and its corresponding optical receiving module are encapsulated in a preset housing;

[0009] The pre-set housing includes a groove between the light emitting module and the light receiving module, the groove being used to accumulate dust.

[0010] In one embodiment, the detection resistor for each optical receiving module has the same resistance value.

[0011] In one embodiment, the resistance value of the detection resistor corresponding to each optical receiving module is different.

[0012] In one embodiment, each light emitting unit includes a light-emitting diode, a first resistor, and a second resistor;

[0013] The first end of the first resistor is connected to the first power supply, and the second end of the first resistor is connected to the first end of the second resistor and the anode of the light-emitting diode.

[0014] The second terminal of the second resistor is grounded to the cathode of the light-emitting diode.

[0015] In one embodiment, each light receiving unit includes a phototransistor.

[0016] In one embodiment, the detection module further includes a capacitor;

[0017] The first terminal of the capacitor is connected to the first terminal of the voltage divider resistor; the second terminal of the capacitor is connected to the first common point.

[0018] A second aspect of this utility model provides a circuit board including the dust accumulation detection circuit described in the first aspect or any of the embodiments of the first aspect.

[0019] A third aspect of this utility model provides a switching power supply, including a heat dissipation channel and a circuit board as described in the second aspect above.

[0020] The dust accumulation detection circuit of the circuit board is located in the heat dissipation channel.

[0021] In one embodiment, the switching power supply further includes a display device;

[0022] The display device is used to display the degree of dust accumulation corresponding to the sensing value output by the dust accumulation detection circuit.

[0023] The beneficial effects of this utility model embodiment compared with the prior art are:

[0024] By setting multiple light emitting modules and corresponding light receiving modules in the dust accumulation detection circuit, the dust accumulation can block the light beam of the light emitting modules, causing the circuit at the light receiving modules to be turned on or off. Furthermore, by setting multiple detection resistors corresponding to the light receiving modules, the equivalent resistance of all detection resistors changes when each light receiving module is turned on or off. Correspondingly, the sensed value output by the voltage output port will change with the change in the equivalent resistance, thus correlating the sensed value output by the voltage output port with the dust accumulation on the circuit board. In this way, the degree of dust accumulation on the circuit board can be determined by the sensed value output by the voltage output port, achieving comprehensive and accurate detection of the degree of dust accumulation on the circuit board, so as to clean the dust in a timely and effective manner. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the first module structure of the dust accumulation detection circuit provided in the embodiments of this application;

[0027] Figure 2 This is a schematic diagram of the second module structure of the dust accumulation detection circuit provided in the embodiments of this application;

[0028] Figure 3 This is a schematic diagram of the third module structure of the dust accumulation detection circuit provided in the embodiments of this application;

[0029] Figure 4 This is a first distribution diagram of the photoelectric switch provided in an embodiment of this application;

[0030] Figure 5 This is a second distribution diagram of the photoelectric switch provided in an embodiment of this application;

[0031] Figure 6 This is a first circuit structure diagram of the dust accumulation detection circuit provided in the embodiments of this application;

[0032] Figure 7 This is a second circuit structure diagram of the dust accumulation detection circuit provided in the embodiments of this application. Detailed Implementation

[0033] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0034] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0035] The inventors have discovered that, in order to detect dust accumulation on circuit boards, the high and low levels output by the dust accumulation detection circuit are usually used to determine whether dust accumulation exists. This method can only simply determine whether dust accumulation exists on the circuit board, and it is difficult to accurately determine the degree of dust accumulation on the circuit board.

[0036] Based on the idea of ​​accurately detecting the degree of dust accumulation on the circuit board, in the embodiments of this application, multiple optical receiving modules and their corresponding detection resistors are set. By turning each optical receiving module on or off, the equivalent resistance value corresponding to all detection resistors can be changed, which can cause the sensing value output by the voltage output port to change accordingly. Thus, the degree of dust accumulation on the circuit board can be accurately obtained through the change of sensing value.

[0037] The implementation of this utility model will be described in detail below with reference to the specific accompanying drawings:

[0038] See Figure 1 and Figure 2 This utility model provides a dust accumulation detection circuit, including a detection module 1, a voltage output port OUT, at least one light emitting module 21, and a light receiving module 22 corresponding to each light emitting module 21. The detection module 1 includes a voltage divider resistor R0 and a detection resistor Ri corresponding to each light receiving module 22. The value of i can be 1, 2, 3...n, where n is a positive integer. When n=1, it means that the detection circuit has only one light emitting module 21 and one light receiving module 22, which is used in environments where the dust accumulation detection requirements are not high. When n>1, it means that at least two light emitting modules 21 and two light receiving modules 22 corresponding to each light emitting module 21 are set, and the dust accumulation level of the device is determined by the combination of multiple modules.

[0039] Here, the light emitting module 21 can be a light source, such as an infrared light source. The light receiving module 22 can be a detector or other device capable of receiving light. The light emitting module 21 and the corresponding light receiving module 22 are arranged on the same optical axis.

[0040] The first end of each optical emitting module 21 is used to connect to the first power supply VCC1, and the second end of each optical emitting module 21 is used to ground GND; each optical emitting module 21 emits a light beam, and each optical receiving module 22 receives the light beam emitted by the corresponding optical emitting module 21.

[0041] Here, the light emitting module 21 and the light receiving module 22 are placed correspondingly. When there is dust between the light emitting module 21 and the light receiving module 22, the dust will block the light beam emitted by the light emitting module 21, and the light receiving module 22 will not be able to receive the light beam, thus detecting the presence of dust between the light emitting module 21 and the light receiving module 22.

[0042] The first end of each optical receiving module 22 is connected to the first end of the voltage divider resistor R0; the second end of each optical receiving module 22 is connected to the first common point through its corresponding detection resistor Ri; the second end of the voltage divider resistor R0 and one of the first common points are used to connect to the second power supply VCC2, and the other is used to ground GND.

[0043] The aforementioned detection resistor Ri is connected in parallel through the optical receiving module 22. When the optical receiving module 22 receives a light beam, the circuit at that optical receiving module 22 will be turned on, and correspondingly, the detection resistor Ri corresponding to the optical receiving module 22 will also be connected to the circuit. When the optical receiving module 22 cannot receive a light beam, the circuit at that optical receiving module 22 will be turned off, and correspondingly, the detection resistor Ri corresponding to the optical receiving module 22 will not be connected to the circuit.

[0044] If the number of sensing resistors Ri in the circuit is different, the equivalent resistance of the parallel connection of the sensing resistors Ri will be different, and the voltage across the parallel equivalent resistance of the sensing resistors Ri and the voltage divider resistor R0 will also be different.

[0045] Here, when the second terminal of the voltage divider resistor R0 is connected to the second power supply VCC2, the voltage divider resistor R0 acts as a pull-up resistor, specifically as follows: Figure 1 As shown. When the second terminal of the voltage divider resistor R0 is grounded, the voltage divider resistor R0 acts as a pull-down resistor, specifically as follows. Figure 2 As shown.

[0046] In addition, the voltages of the first power supply VCC1 and the second power supply VCC2 can be the same, for example, 3.3V. The first power supply VCC1 and the second power supply VCC2 can also use the same power supply.

[0047] The first terminal of the voltage divider resistor R0 serves as the voltage output port OUT; where the voltage output port OUT is used to output the sensed value.

[0048] Here, the voltage output port OUT can output a corresponding sensing value based on the detected degree of dust accumulation. Figure 1 For example, the higher the degree of dust accumulation on the circuit board, the more optical receiving modules 22 that cannot be conducted, the fewer the detection resistors in the corresponding access circuit, the larger the equivalent resistance value, and the higher the corresponding sensing value.

[0049] This embodiment of the invention sets up multiple light emitting modules and corresponding light receiving modules in the dust accumulation detection circuit. The dust accumulation can block the light beam from the light emitting modules, causing the circuit at the light receiving modules to be turned on or off. Furthermore, by setting multiple detection resistors corresponding to the light receiving modules, the equivalent resistance of all detection resistors changes when each light receiving module is turned on or off. Correspondingly, the sensed value output by the voltage output port changes with the change in the equivalent resistance, thus correlating the sensed value output by the voltage output port with the dust accumulation on the circuit board. This allows for the determination of the degree of dust accumulation on the circuit board through the sensed value output by the voltage output port, achieving comprehensive and accurate detection of the dust accumulation level on the circuit board for timely and effective dust removal.

[0050] In some embodiments, each light emitting module 21 and its corresponding light receiving module 22 are encapsulated in a preset housing; the preset housing includes a groove disposed between the light emitting module and the light receiving module, the groove being used to accumulate dust.

[0051] Here, as Figure 3 As shown, the light emitting module 21 and its corresponding light receiving module 22 can be packaged into a whole to form a photoelectric switch 2.

[0052] The optical emitting module 21 and the optical receiving module 22 are configured correspondingly and can be positioned on the same optical axis. The light beam emitted by the optical emitting module 21 reaches the optical receiving module 22 through a groove. Dust can accumulate in the groove, and the accumulated dust will block the light beam, affecting the optical receiving module 22's ability to receive the light beam.

[0053] In some embodiments, the resistance value of the detection resistor Ri corresponding to each optical receiving module 22 may be the same.

[0054] Here, each optical receiver module 22 is positioned in a different location. By using the same resistance value, it is possible to accurately determine how many detection resistors Ri are not connected to the circuit, thereby determining how many optical receiver modules 22 are not conducting. This allows for a quick and accurate assessment of the degree of dust accumulation on the circuit board. Generally, dust tends to accumulate near the air inlet, and the closer the distance, the easier it is for dust to accumulate. The higher the degree of dust accumulation, the more photoelectric switches will have their beams blocked, and the more photoelectric switches will fail to conduct.

[0055] For example, see details. Figure 4 As shown, the distance between each optical receiving module 22 and the air inlet of the heat dissipation channel 3 of the device ( Figure 4 The distance between the arrows (indicating the direction of air intake) and the number of times the optical receiving module 22 is disconnected can determine the location and extent of dust accumulation on the circuit board at the heat dissipation channel 3, and thus the degree of dust accumulation can be obtained.

[0056] When only one optical receiving module 22 is disconnected, meaning there is slight dust accumulation between the optical transmitting module 21 and the optical receiving module 22 located close to the air inlet, this can be classified as light dust accumulation. When multiple optical receiving modules 22 are disconnected, meaning there is dust accumulation between multiple optical transmitting modules 21 and the optical receiving module 22 located close to the air inlet, this dust accumulation is more severe, and can be classified as moderate dust accumulation. When a large number of optical receiving modules 22 are disconnected, there is severe dust accumulation between a large number of optical transmitting modules 21 and the optical receiving module 22, and this can be classified as heavy dust accumulation.

[0057] In other embodiments, the resistance value of the detection resistor Ri corresponding to each optical receiving module 22 is different.

[0058] Here, by accurately selecting the resistance values ​​of each detection resistor Ri, it is possible to precisely determine which detection resistor Ri is connected to or not connected to the circuit when the equivalent resistance values ​​of each detection resistor Ri are different.

[0059] At this point, please refer to the details. Figure 5 As shown, by distributing the light receiving modules 22 at different locations on the circuit board in the heat dissipation channel 3, the sensing value obtained from the voltage output port OUT can determine which location the detection resistor is not connected, i.e. which location the photoelectric switch is not conducting. Thus, the dust accumulation situation at different locations on the circuit board can be determined, and the range of dust accumulation on the circuit board can be obtained.

[0060] Among them, the position of some optical receiving modules 22 can be the same distance from the air inlet. For the optical receiving modules 22 that are the same distance from the air inlet, by setting them in different positions, the degree of dust accumulation corresponding to different angles can be detected, thereby detecting the range of dust accumulation in the horizontal direction relative to the heat dissipation channel. Figure 3 and Figure 4 The position of photoelectric switch 2 is only for illustration. In application, it can be set according to the actual range where dust easily accumulates and the detection requirements. There is no limitation here.

[0061] In some embodiments, such as Figure 6 The diagram shows the first circuit structure of the dust accumulation detection circuit. Each light emitting unit 21 includes a light-emitting diode Di, a first resistor Rgi1, and a second resistor Rgi2. The first end of the first resistor Rgi1 is connected to the first power supply VCC1, and the second end of the first resistor Rgi1 is connected to the first end of the second resistor Rgi2 and the anode of the light-emitting diode Di. The second end of the second resistor Rgi2 and the cathode of the light-emitting diode Di are used for grounding GND. The value of i can be 1, 2, 3...n, corresponding to the detection resistor Ri.

[0062] In this embodiment, a light-emitting diode can be used as the light source, and the first power supply VCC1 can be used for power supply.

[0063] Optionally, each optical receiving unit may include a phototransistor Qi. The value of i can be 1, 2, 3...n, corresponding to the detection resistor Ri.

[0064] In some embodiments, see Figure 6 As shown, the detection module 1 also includes a capacitor C1; the first end of the capacitor C1 is connected to the first end of the voltage divider resistor R0; the second end of the capacitor C1 is connected to the first common point.

[0065] In this embodiment, a capacitor C1 can also be set in the detection module 1 to achieve the functions of anti-jitter and filtering, so as to ensure the stability of the output sensing value.

[0066] In some specific embodiments, the example of using two photoelectric switches is used for illustration. See [link to documentation]. Figure 7 The diagram shows the second circuit structure of the dust accumulation detection circuit. The second terminal of the voltage divider resistor R0 is connected to the second power supply VCC2, and the resistance of the voltage divider resistor R0 is 3KΩ. The resistances of the detection resistors R1 and R2 are both 2.4KΩ, and the voltage of the second power supply VCC2 is 3.3V.

[0067] When both photoelectric switches 2 are not blocked, that is, when both photoelectric switches 2 are on, the detection resistors R1 and R2 are connected in parallel, and the 3.3V voltage is divided to ground. The sensed value output by the voltage output port OUT is 0.95V.

[0068] When one of the two photoelectric switches 2 is blocked and the other photoelectric switch is turned on, one of the detection resistors R1 and R2 is connected in the circuit, and the 3.3V voltage is divided to ground. The sensed value output by the voltage output port OUT is 1.47V.

[0069] When both photoelectric switches 2 are blocked, that is, when neither photoelectric switch 2 is conducting, the detection resistors R1 and R2 are not connected in the circuit, there is no voltage drop between 3.3V and ground, and the sensed value output by the voltage output port OUT is 3.3V.

[0070] Accordingly, the degree of dust accumulation can be determined as follows: when the sensing value output by the voltage output port OUT is in [0, 0.95V), the degree of dust accumulation is determined to be no dust accumulation; when the sensing value output by the voltage output port OUT is in [0.95V, 1.47V), the degree of dust accumulation is determined to be light dust accumulation; when the sensing value output is in [1.47V, 3V), the degree of dust accumulation is determined to be moderate dust accumulation; when the sensing value output is in [3V, 3.3V], the degree of dust accumulation is determined to be heavy dust accumulation.

[0071] This application also provides a circuit board and a switching power supply. For details not described in detail herein, please refer to the corresponding circuit embodiments described above.

[0072] In some embodiments, the circuit board may include a dust accumulation detection circuit as described in any of the above embodiments.

[0073] In some embodiments, the switching power supply may include a heat dissipation channel and the circuit board described above. A dust accumulation detection circuit on the circuit board is located within the heat dissipation channel to detect the degree of dust accumulation.

[0074] Optionally, since dust generally accumulates at the air inlet of the heat dissipation channel, the dust accumulation near the air inlet can be detected. Accordingly, the distance between the dust accumulation detection circuit and the air inlet of the heat dissipation channel is less than a preset length.

[0075] Optionally, the switching power supply may also include a display device; the display device is used to display the degree of dust accumulation corresponding to the sensed value output by the dust accumulation detection circuit.

[0076] Here, the display device can be a screen, on which the sensing value, dust accumulation level, and alarm information can be displayed. The display device can also be an alarm light, which can display different colors according to the degree of dust accumulation, such as green or not lit for no dust accumulation, yellow for light dust accumulation, orange for moderate dust accumulation, and red for heavy dust accumulation; or, different numbers of lights can be lit according to the degree of dust accumulation, such as one red light for light dust accumulation, two red lights for moderate dust accumulation, and three red lights for heavy dust accumulation, etc.

[0077] In addition, an alarm device can be installed. When dust accumulates, the alarm device can sound an alarm and send the alarm information to relevant personnel.

[0078] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A dust accumulation detection circuit, characterized in that, It includes a detection module, a voltage output port, at least one optical emitting module, and an optical receiving module corresponding to each optical emitting module; the detection module includes a voltage divider resistor and a detection resistor corresponding to each optical receiving module; The first end of each optical emitting module is used to connect to the first power supply, and the second end of each optical emitting module is used to ground; each optical emitting module emits a light beam, and each optical receiving module receives the light beam emitted by the corresponding optical emitting module. The first end of each optical receiving module is connected to the first end of the voltage divider resistor; the second end of each optical receiving module is connected to the first common point through its corresponding detection resistor; one of the second end of the voltage divider resistor and the first common point is used to connect to the second power supply, and the other is used to ground. The voltage output port is connected to the first end of the voltage divider resistor; wherein, the voltage output port is used to output the sensed value.

2. The dust accumulation detection circuit according to claim 1, characterized in that, Each optical transmitting module and its corresponding optical receiving module are encapsulated in a pre-designed housing; The pre-set housing includes a groove between the light emitting module and the light receiving module, the groove being used to accumulate dust.

3. The dust accumulation detection circuit according to claim 1, characterized in that, The detection resistor for each optical receiver module has the same resistance value.

4. The dust accumulation detection circuit according to claim 1, characterized in that, Each optical receiver module has a different resistance value for its detection resistor.

5. The dust accumulation detection circuit according to any one of claims 1 to 3, characterized in that, Each light-emitting unit includes a light-emitting diode, a first resistor, and a second resistor; The first end of the first resistor is connected to the first power supply, and the second end of the first resistor is connected to the first end of the second resistor and the anode of the light-emitting diode. The second terminal of the second resistor is grounded to the cathode of the light-emitting diode.

6. The dust accumulation detection circuit according to claim 5, characterized in that, Each optical receiving unit includes a phototransistor.

7. The dust accumulation detection circuit according to any one of claims 1 to 4, characterized in that, The detection module also includes a capacitor; The first terminal of the capacitor is connected to the first terminal of the voltage divider resistor; the second terminal of the capacitor is connected to the first common point.

8. A circuit board, characterized in that, It includes the dust accumulation detection circuit as described in any one of claims 1 to 7.

9. A switching power supply, characterized in that, Includes heat dissipation channels and the circuit board as described in claim 8 above; The dust accumulation detection circuit of the circuit board is located in the heat dissipation channel.

10. The switching power supply according to claim 9, characterized in that, Switching power supplies also include display devices; The display device is used to display the degree of dust accumulation corresponding to the sensing value output by the dust accumulation detection circuit.

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