A lighting module failure detection apparatus, a lighting system and a clothes drying machine
By designing a fault detection device for lighting modules in home appliances, and using current detection and control modules to identify faults and shut down the lighting modules, the problem of equipment damage caused by lighting module failures is solved, thus improving the reliability and safety of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG HOTATA TECH GRP
- Filing Date
- 2025-08-04
- Publication Date
- 2026-07-24
AI Technical Summary
When the lighting module of a home appliance malfunctions, it can easily lead to damage to other components, affecting its lifespan and safety.
Design a lighting module fault detection device, including a control module, a lighting drive module and a current detection module. The current is detected by a sampling unit, filtered by a filtering unit and current limited by a current limiting unit. The control module determines the fault and shuts down the lighting module, and the display module displays the detection data.
It improves the operational reliability and lifespan of home appliances, prevents faulty lighting modules from damaging other modules, and ensures equipment safety and user convenience in maintenance.
Smart Images
Figure CN224555833U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lighting, and in particular to a lighting module fault detection device, a lighting system, and a clothes drying rack. Background Technology
[0002] Lighting modules can provide sufficient light at night or in low-light environments to help users see their surroundings and avoid falls. At the same time, the lighting function can also be used to remind users of the working status of home appliances, serving as a warning. Lighting modules are often used as functional modules in home appliances.
[0003] However, when the lighting module of a home appliance malfunctions, for example, when the lighting module is short-circuited, if the lighting module is still turned on, it can easily lead to damage to other components of the home appliance, affecting the service life and safety of the home appliance. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a lighting module fault detection device, a lighting system and a clothes dryer, which can detect whether the lighting module is faulty in a timely manner and improve the operational reliability and lifespan of home appliances.
[0005] In a first aspect, this utility model provides a lighting module fault detection device, which is applied to the lighting module of a household appliance and includes: a control module, a lighting drive module and a current detection module;
[0006] The first signal terminal of the control module is connected to the first terminal of the lighting drive module, and the second terminal of the lighting drive module is connected to the first terminal of the lighting module; the lighting drive module is used to turn the lighting module on or off.
[0007] The current detection module includes a sampling unit, a filtering unit, and a current limiting unit; the input terminal of the sampling unit is connected to the second terminal of the lighting module, the output terminal of the sampling unit is connected to the input terminal of the filtering unit, the output terminal of the filtering unit is connected to the input terminal of the current limiting unit, and the output terminal of the current limiting unit is connected to the second signal terminal of the control module.
[0008] In one embodiment, the sampling unit includes a sampling resistor, the first end of which is connected to the first end of the lighting module, and the second end of which is grounded.
[0009] In this embodiment, the current of the lighting module is detected by obtaining the voltage drop across the sampling resistor. The sampling unit has a simple structure and low detection cost.
[0010] In one embodiment, the current limiting unit includes a current limiting resistor; the first end of the current limiting resistor is connected to the second signal terminal of the control module, and the second end of the current limiting resistor is connected to the output terminal of the filtering unit.
[0011] By using a current-limiting resistor to limit the current output to the second signal terminal of the control module, damage to the control module due to overcurrent can be avoided, thereby improving the lifespan and operational reliability of the control module.
[0012] In one embodiment, the filtering unit includes an inductor, a first capacitor, and a second capacitor;
[0013] The first end of the inductor is connected to the output end of the current limiting unit, the first end of the first capacitor, and the first end of the second capacitor, respectively. The second end of the inductor is connected to the first end of the lighting module. The second ends of the first capacitor and the second capacitor are grounded.
[0014] In this embodiment, an LC filter circuit is formed by inductors and capacitors to filter the sampled signal, thereby reducing DC loss and improving the filtering effect.
[0015] In one embodiment, the current detection module further includes a first diode and a second diode; the positive terminal of the first diode is connected to the second signal terminal of the control module and the negative terminal of the second diode, respectively; the negative terminal of the first diode is connected to the power supply, and the positive terminal of the second diode is grounded.
[0016] In this embodiment, by setting a first diode and a second diode at the second signal terminal of the control module, the voltage of the second signal terminal is clamped within the voltage range that the second signal terminal can withstand, thereby preventing the second signal terminal from being burned out and improving the operational reliability and lifespan of the control module.
[0017] In one embodiment, the lighting driving module includes a MOSFET, a first resistor, a second resistor, and a third capacitor;
[0018] The gate of the MOS transistor is connected to the first end of the first resistor, the first end of the second resistor, and the first end of the third capacitor, respectively. The second end of the first resistor is connected to the first signal terminal of the control module. The second end of the second resistor and the second end of the third capacitor are connected to the source of the MOS transistor and the second terminal of the lighting module, respectively. The drain of the MOS transistor is connected to the power supply.
[0019] In this embodiment, the control module outputs PWM control signals with different duty cycles to the gate of the MOSFET to control the rapid turn-on and turn-off of the MOSFET, thereby adjusting the brightness of the lighting module; when an abnormality is detected in the lighting module, the control module stops outputting PWM control signals to the gate of the MOSFET, the MOSFET is turned off, thereby shutting down the lighting module and ensuring the safe operation of the home appliance.
[0020] In one embodiment, the lighting driving module includes a body diode, the anode of which is connected to the source of the MOS transistor, and the cathode of which is connected to the drain of the MOS transistor.
[0021] In this embodiment, by connecting a body diode in parallel with the source and drain of the MOSFET, when the source-drain voltage is too high, the body diode breaks down in reverse and guides the current to ground, which can prevent the MOSFET from breaking down and improve the service life of the MOSFET.
[0022] In one embodiment, a display module is further included; the display module is connected to the third signal terminal of the control module, and the display module is used to display current detection data.
[0023] The display module shows the current sampling data, providing a clear view of the current detection status of the lighting module and facilitating timely troubleshooting for users.
[0024] Secondly, this utility model provides a lighting system, including a lighting module and a lighting module fault detection device as described in any of the above claims.
[0025] Thirdly, this utility model provides a clothes drying rack, including a lighting module and a lighting module fault detection device as described in any of the above claims.
[0026] In this embodiment, the current of the lighting module is sampled using a sampling unit, the sampled signal is filtered using a filtering unit, and the current is limited using a current limiting unit before being output to the second signal terminal of the control module. The control module determines whether the lighting module is abnormal based on the sampled signal, thereby improving the accuracy of fault detection. When the lighting module is abnormal, a control signal is output to the lighting drive module to shut down the lighting module, preventing the faulty lighting module from turning on and damaging other modules of the home appliance, thus ensuring the operational safety of the home appliance. Furthermore, the current sampling data is displayed through a display module, intuitively showing the current detection status of the lighting module, which facilitates timely fault handling by the user.
[0027] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the structure of a lighting module fault detection device in one embodiment of the present invention;
[0029] Figure 2 This is a circuit diagram of the current detection module in one embodiment of the present invention;
[0030] Figure 3 This is a circuit diagram of a lighting drive module in one embodiment of the present invention;
[0031] Figure 4 This is a schematic diagram of the structure of a lighting module fault detection device in another embodiment of the present invention;
[0032] Figure 5 This is a schematic diagram of the display interface of the display module in one embodiment of the present invention;
[0033] Figure 6 This is a schematic diagram of a lighting system in one embodiment of the present invention;
[0034] Figure 7 This is a schematic diagram of a clothes drying rack according to one embodiment of the present invention. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be described in further detail below with reference to the accompanying drawings.
[0036] It should be understood that the described embodiments are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0037] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.
[0038] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0039] Furthermore, in the description of this application, unless otherwise stated, "several" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0040] This invention provides a lighting module fault detection device, which can be applied to the lighting modules of home appliances to detect faults in the lighting modules and promptly shut down the lighting module when it fails, thus preventing damage to other modules of the home appliance and improving the operational reliability and lifespan of the home appliance.
[0041] like Figure 1 As shown, this utility model provides a lighting module fault detection device, including: a control module 110, a lighting drive module 120 and a current detection module 130;
[0042] The first signal terminal of the control module 110 is connected to the first terminal of the lighting drive module 120, and the second terminal of the lighting drive module 120 is connected to the first terminal of the lighting module.
[0043] The lighting drive module 120 is used to turn the lighting module on or off, thereby turning the lighting function of the lighting module on or off.
[0044] The lighting driver module 120 can use existing lighting driver chips or lighting driver circuits to drive the lighting module.
[0045] The current detection module 130 includes: a sampling unit 131, a filtering unit 132, and a current limiting unit 133; the input terminal of the sampling unit 131 is connected to the second terminal of the lighting module, the output terminal of the sampling unit 131 is connected to the input terminal of the filtering unit 132, the output terminal of the filtering unit 132 is connected to the input terminal of the current limiting unit 133, and the output terminal of the current limiting unit 133 is connected to the second signal terminal of the control module 110.
[0046] The sampling unit 131 is used to sample the current of the lighting module;
[0047] The filtering unit 132 is used to filter the sampling signal of the sampling unit 131 to improve the reliability of the sampling signal.
[0048] The current limiting unit 133 is used to limit the current output to the second signal terminal of the control module 110, so as to avoid damage to the second signal terminal due to excessive current and improve the safety and reliability of the operation of the second signal terminal.
[0049] The sampling unit 131 can use a sampling resistor or other sampling elements to sample the current of the lighting module.
[0050] The filter unit 132 can use common filter elements such as inductors and capacitors, or common filter circuits or filter modules such as LC filter circuits and RC filter circuits to filter the output signal.
[0051] The current limiting unit 133 can use common current limiting components such as resistors and transistors or current limiting current to limit the output signal.
[0052] The control module 110 can control the lighting drive module 120 based on the sampling signal from the sampling unit 131, thereby controlling the lighting module through the lighting drive module 120.
[0053] The control module 110 can compare the sampled signal with a preset standard signal. If the sampled signal is inconsistent with the standard signal, it determines that the lighting module is abnormal. If the sampled signal is consistent with the standard signal, it determines that the lighting module is normal.
[0054] The control module 110 can output a shutdown signal to the lighting driver module 120 when it is determined that the lighting module is abnormal, thereby shutting down the lighting module through the lighting driver module 120, ensuring the operational safety of other modules of the home appliance, reminding the user to pay attention to safety and lighting module failure, and facilitating the user to carry out timely repair and replacement.
[0055] The control module 110 is used to output an on signal to the lighting driver module 120 to turn on the lighting module when it is determined that the lighting module is normal, so as to illuminate the environment around the home appliance.
[0056] In this embodiment, the current of the lighting module is sampled by a sampling unit, the sampled signal is filtered by a filtering unit, and the current is limited by a current limiting unit before being output to the second signal terminal of the control module. The control module determines whether the lighting module is abnormal based on the sampled signal, thereby improving the accuracy of fault detection. When the lighting module is abnormal, a control signal is output to the lighting drive module to shut down the lighting module, preventing the faulty lighting module from turning on and damaging other modules of the home appliance, thus ensuring the operational safety of the home appliance.
[0057] like Figure 2 As shown, in one embodiment, the sampling unit 131 includes a sampling resistor R29, the first end of which is connected to the first end of the lighting module, and the second end of which is grounded.
[0058] The resistance value of the sampling resistor R29 can be set according to the actual operating conditions of the lighting module. In this embodiment, the resistance value of the sampling resistor R29 can be 0.2Ω.
[0059] In this embodiment, the current of the lighting module is detected by obtaining the voltage drop across the sampling resistor R29. The sampling unit has a simple structure and low detection cost.
[0060] The control module compares the voltage value of the sampled signal with the voltage value or voltage range of the standard signal. If the voltage value of the sampled signal matches the voltage value of the standard signal, or if the voltage value is within the voltage range, the lighting module is determined to be normal. If the voltage value of the sampled signal does not match the voltage value of the standard signal, or if the voltage value is outside the voltage range, the lighting module is determined to be faulty.
[0061] like Figure 2 As shown, in one embodiment, the current limiting unit 133 includes a current limiting resistor R24; the first end of the current limiting resistor R24 is connected to the second signal terminal of the control module 110, and the second end of the current limiting resistor R24 is connected to the output terminal of the filter unit 132.
[0062] The resistance value of the current-limiting resistor R24 can be set according to the voltage threshold of the second signal terminal of the control module 110. In this embodiment, the resistance value of the current-limiting resistor R24 can be 1KΩ.
[0063] By using a current-limiting resistor to limit the current output to the second signal terminal of the control module, damage to the control module due to overcurrent can be avoided, thereby improving the lifespan and operational reliability of the control module.
[0064] In one embodiment, the filtering unit 132 includes an inductor L4, a capacitor CE8, and a capacitor C5; the current limiting unit 133 includes a current limiting resistor R24.
[0065] The first end of the inductor L4 is connected to the output end of the current limiting unit 133, the first end of the first capacitor CE8, and the first end of the second capacitor C5, respectively. The second end of the inductor L4 is connected to the first end of the lighting module. The second ends of the first capacitor CE8 and the second end of the second capacitor C5 are grounded.
[0066] In this embodiment, the inductance value of inductor L4 can be 3.3uH, the first capacitor CE8 can be an electrolytic capacitor with a capacitance of 10uF, and the second capacitor C5 can be a ceramic capacitor with a capacitance of 100nF. In other embodiments, the inductance value of inductor L4 and the capacitance values of the first capacitor CE8 and the second capacitor C5 can be set according to actual application requirements.
[0067] In this embodiment, an LC filter circuit is formed by inductors and capacitors to filter the sampled signal, thereby reducing DC loss and improving the filtering effect.
[0068] In one embodiment, the current detection module 130 further includes a first diode D1 and a second diode D2; the positive terminal of the first diode D1 is connected to the second signal terminal of the control module 110 and the negative terminal of the second diode D2, respectively; the negative terminal of the first diode D1 is connected to the power supply, and the positive terminal of the second diode D2 is grounded.
[0069] The first diode D1 and the second diode D2 can both be 1N4148. The power supply connected to the negative terminal of the first diode D1 can be set according to the operating voltage of the second signal terminal. In this embodiment, the negative terminal of the first diode D1 is connected to a 5V power supply.
[0070] In this embodiment, by setting a first diode and a second diode at the second signal terminal of the control module, the voltage of the second signal terminal is clamped within the voltage range that the second signal terminal can withstand, thereby preventing the second signal terminal from being burned out and improving the operational reliability and lifespan of the control module.
[0071] In one embodiment, the lighting drive module 120 can also be used to adjust the brightness of the lighting module.
[0072] Specifically, such as Figure 3 As shown, the lighting driving module 120 includes a MOSFET Q1, a first resistor R48, a second resistor R47, and a third capacitor C10;
[0073] The gate of the MOS transistor Q1 is connected to the first terminal of the first resistor R48, the first terminal of the second resistor R47, and the first terminal of the third capacitor C10. The second terminal of the first resistor R48 is connected to the first signal terminal of the control module 110. The second terminal of the second resistor R47 and the second terminal of the third capacitor C10 are connected to the source of the MOS transistor Q1 and the second terminal of the lighting module, respectively. The drain of the MOS transistor Q1 is connected to the power supply.
[0074] In this embodiment, the MOSFET Q1 can be an NMOS transistor, the first resistor R48 can have a resistance of 1KΩ, the second resistor R47 can have a resistance of 20KΩ, and the third capacitor C10 can have a capacitance of 100pF. In other embodiments, the first resistor R48 and the second resistor R47 can be set according to the actual circuit application. The power supply connected to the drain of the MOSFET Q1 can be determined according to the lighting module or the operating voltage of the MOSFET Q1. In this embodiment, the drain of the MOSFET Q1 is connected to a 32V power supply.
[0075] In this embodiment, the control module 110 outputs PWM control signals with different duty cycles to the gate of the MOSFET Q1 to control the rapid turn-on and turn-off of the MOSFET Q1, thereby adjusting the brightness of the lighting module; when an abnormality is detected in the lighting module, the control module 110 stops outputting PWM control signals to the gate of the MOSFET Q1, the MOSFET Q1 is turned off, thereby shutting down the lighting module and ensuring the safe operation of the home appliance.
[0076] In a preferred embodiment, the lighting driving module 120 further includes a body diode, the anode of which is connected to the source of the MOS transistor Q1, and the cathode of which is connected to the drain of the MOS transistor Q1.
[0077] In this embodiment, by connecting a body diode in parallel with the source and drain of the MOSFET Q1, when the source-drain voltage is too high, the body diode breaks down in reverse and guides the current to ground, which can prevent the MOSFET from breaking down and improve the service life of the MOSFET.
[0078] In one embodiment, the control module 110 further includes a power supply input terminal and a power supply output terminal. The power supply input terminal is connected to a 220V AC power supply, and the power supply output terminal is connected to the drain of the MOSFET Q1. The power supply output terminal is used to output a target DC voltage.
[0079] The control module 110 may have a built-in voltage conversion unit, which converts 220V AC power into target DC power. The voltage conversion unit supplies power to other modules of the device through its power output terminal. The voltage conversion unit can use existing AC / DC conversion chips or current conversion devices to perform voltage conversion.
[0080] In this embodiment, a control module is used to convert 220V AC power into target DC power and supply power to the lighting driver module through the power output terminal, thereby meeting the power requirements of the lighting driver module.
[0081] like Figure 4 As shown, in one embodiment, the lighting module fault detection device further includes a display module 140;
[0082] The display module 140 is connected to the third signal terminal of the control module 110, and the display module 140 is used to display current detection data.
[0083] The display module shows the current sampling data, providing a clear view of the current detection status of the lighting module and facilitating timely troubleshooting for users.
[0084] like Figure 5 As shown, it is a schematic diagram of the display interface of the display module 140 in one embodiment of this application; in this embodiment, the current detection data may include: the current curve of the lighting module, the upper limit curve of the current and the lower limit curve of the current; wherein, the vertical axis is the duty cycle of the PWM signal and the horizontal axis is time.
[0085] The relationship between the duty cycle and time of the PWM signal is as follows:
[0086] Where x is the time it takes for the lighting module to go from off to on (in this embodiment, 0 <= x <= 750, in milliseconds), and y is the duty cycle of the PWM signal.
[0087] Specifically, during the time it takes for the lighting module to go from off to on (gradual brightening time), the current of the lighting module is sampled at set time intervals to generate a current curve. When the sampled current curve exceeds the upper limit current curve or falls below the lower limit current curve, it is determined that the lighting module is abnormal.
[0088] In this embodiment of the application, by displaying the current curve on the display interface, users can easily grasp the current detection status of the current module and promptly repair or replace the faulty lighting module.
[0089] like Figure 6 As shown, this application embodiment also provides a lighting system 200, including a lighting module 210 and a lighting module fault detection device 220 as described in any of the above claims.
[0090] The lighting system 200 of this application embodiment can be applied to household appliances such as clothes dryers to realize lighting functions. This application embodiment can automatically detect whether the lighting module is faulty and shut down the lighting module in time when the lighting module is faulty, thereby improving the safety of the operation of household appliances.
[0091] like Figure 7 As shown, this application embodiment also provides a clothes drying rack 300, including a lighting module 310 and a lighting module fault detection device 320 as described in any of the above claims.
[0092] The embodiments of this application can automatically detect whether the lighting module of the clothes drying rack is faulty, and promptly shut down the lighting module when it is faulty, thereby improving the safety of the clothes drying rack operation.
[0093] This utility model is not limited to the above-described embodiments. If any modifications or variations to this utility model do not depart from the spirit and scope of this utility model, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this utility model, then this utility model also intends to include such modifications and variations.
Claims
1. A lighting module fault detection device, characterized in that, Applications in lighting modules of home appliances include: control modules, lighting driver modules, and current detection modules; The first signal terminal of the control module is connected to the first terminal of the lighting drive module, and the second terminal of the lighting drive module is connected to the first terminal of the lighting module; the lighting drive module is used to turn the lighting module on or off. The current detection module includes a sampling unit, a filtering unit, and a current limiting unit; the input terminal of the sampling unit is connected to the second terminal of the lighting module, the output terminal of the sampling unit is connected to the input terminal of the filtering unit, the output terminal of the filtering unit is connected to the input terminal of the current limiting unit, and the output terminal of the current limiting unit is connected to the second signal terminal of the control module.
2. The lighting module fault detection device according to claim 1, characterized in that, The sampling unit includes a sampling resistor, the first end of which is connected to the first end of the lighting module, and the second end of which is grounded.
3. The lighting module fault detection device according to claim 1, characterized in that, The current limiting unit includes a current limiting resistor; the first end of the current limiting resistor is connected to the second signal terminal of the control module, and the second end of the current limiting resistor is connected to the output terminal of the filtering unit.
4. The lighting module fault detection device according to claim 1, characterized in that, The filtering unit includes an inductor, a first capacitor, and a second capacitor; The first end of the inductor is connected to the output end of the current limiting unit, the first end of the first capacitor, and the first end of the second capacitor, respectively. The second end of the inductor is connected to the first end of the lighting module. The second ends of the first capacitor and the second capacitor are grounded.
5. The lighting module fault detection device according to claim 1, characterized in that, The current detection module further includes a first diode and a second diode; the positive terminal of the first diode is connected to the second signal terminal of the control module and the negative terminal of the second diode, respectively; the negative terminal of the first diode is connected to the power supply, and the positive terminal of the second diode is grounded.
6. The lighting module fault detection device according to claim 1, characterized in that, The lighting driving module includes a MOSFET, a first resistor, a second resistor, and a third capacitor; The gate of the MOS transistor is connected to the first end of the first resistor, the first end of the second resistor, and the first end of the third capacitor, respectively. The second end of the first resistor is connected to the first signal terminal of the control module. The second end of the second resistor and the second end of the third capacitor are connected to the source of the MOS transistor and the second terminal of the lighting module, respectively. The drain of the MOS transistor is connected to the power supply.
7. The lighting module fault detection device according to claim 6, characterized in that, The lighting driving module includes a body diode, the anode of which is connected to the source of the MOS transistor, and the cathode of which is connected to the drain of the MOS transistor.
8. The lighting module fault detection device according to claim 1, characterized in that, It also includes a display module; the display module is connected to the third signal terminal of the control module, and the display module is used to display current detection data.
9. A lighting system, characterized in that, It includes a lighting module and a lighting module fault detection device as described in any one of claims 1-8.
10. A clothes drying rack, characterized in that, It includes a lighting module and a lighting module fault detection device as described in any one of claims 1-8.