Household appliance lamp brightness adjusting circuit and household appliance

Abstract

The embodiment of the utility model provides a household appliance lamp brightness adjusting circuit and a household appliance. The adjusting circuit comprises a variable resistance unit and a control unit. The first end of the variable resistance unit is electrically connected with the power supply end, the second end of the variable resistance unit is electrically connected with the grounding end, the variable resistance end of the variable resistance unit is electrically connected with the input end of the control unit, and the output end of the control unit is used for being electrically connected with a lamp; the variable resistance unit is used for transmitting an electrodeless voltage adjusting signal to the control unit based on the resistance value change; and the control unit is used for adjusting the brightness of the lamp in an electrodeless manner according to the electrodeless voltage adjusting signal. According to the embodiment of the invention, the variable resistance unit capable of smoothly changing the resistance is arranged, the voltage signal received by the control unit is smoothly changed, the control unit controls the brightness of the lamp according to the voltage signal, stepless adjustment of the brightness of the lamp of the household appliance is realized, diversified use requirements of users are met, the user experience is greatly optimized, elements are easy to obtain, and the cost is low. Cost is low and setting is simple.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of household appliances, and particularly relate to a household appliance lamp brightness adjustment circuit and a household appliance. Background Art

[0002] Steamers or ovens are increasingly used in households. During the baking process, it is often necessary to check the color and other baking conditions of the food in the oven through the glass. At this time, the lighting conditions of the baking cavity inside the oven are particularly important. When baking different foods, different brightness of light is required to facilitate users to observe the state of the food. Some foods are difficult to distinguish under too strong light, and too strong light will also make users feel dazzled. Conversely, too weak light is not conducive to observing the state of the food.

[0003] Existing oven lights have only two states: off and on, which cannot meet the diverse needs of users. Utility Model Content

[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art, and provide a household appliance lamp brightness adjustment circuit and a household appliance.

[0005] One aspect of the present disclosure provides a brightness adjustment circuit for a household appliance lamp, the household appliance comprising a cavity and the lamp disposed in the cavity, the adjustment circuit comprising a variable resistor unit and a control unit;

[0006] The first end of the variable resistor unit is electrically connected to the power supply end, the second end of the variable resistor unit is electrically connected to the ground end, the variable resistor end of the variable resistor unit is electrically connected to the input end of the control unit, and the output end of the control unit is used to be electrically connected to the lamp;

[0007] The variable resistor unit is used to transmit a stepless voltage adjustment signal to the control unit based on the change of its resistance value;

[0008] The control unit is used to steplessly adjust the brightness of the lamp according to the stepless voltage adjustment signal.

[0009] Further, the variable resistor unit includes a sliding resistor, and the sliding resistor includes a resistor sheet and a sliding contact;

[0010] Two ends of the resistor are electrically connected to the power supply end and the ground end respectively;

[0011] The first end of the sliding contact is slidably connected to the resistor, and the second end of the sliding contact is electrically connected to the input end of the control unit.

[0012] Optionally, the sliding rheostat is a rotary sliding rheostat; the adjustment circuit further includes an adjustment knob;

[0013] The adjusting knob is rotatably arranged outside the cavity, and the adjusting knob is connected to the rotary sliding rheostat.

[0014] Optionally, the circumference or end surface of the adjustment knob is provided with scales.

[0015] Optionally, the sliding rheostat is a rotary sliding rheostat, and the adjustment circuit further includes an angle sensor;

[0016] The angle sensor is rotatably arranged outside the cavity, and the angle sensor is connected to the rotary sliding rheostat.

[0017] Furthermore, the adjustment circuit also includes a current limiting unit;

[0018] The first end of the current limiting unit is electrically connected to the variable resistance end of the variable resistance unit, and the second end of the current limiting unit is electrically connected to the input end of the control unit.

[0019] Furthermore, the adjustment circuit also includes a pull-down unit;

[0020] The first end of the pull-down unit is electrically connected to the first end of the current limiting unit, and the second end of the pull-down unit is electrically connected to the ground end.

[0021] Furthermore, the adjustment circuit also includes an anti-interference unit;

[0022] The first end of the anti-interference unit is electrically connected to the input end of the control unit, and the second end of the anti-interference unit is electrically connected to the ground end.

[0023] Furthermore, the anti-interference unit includes an anti-interference capacitor.

[0024] Another aspect of the present disclosure provides a household appliance, the household appliance comprising a cavity, a lamp disposed in the cavity, and the adjustment circuit described above;

[0025] The output end of the control unit is electrically connected to the lamp and is used to adjust the brightness of the lamp.

[0026] A household appliance lamp brightness adjustment circuit and a household appliance according to an embodiment of the present disclosure smoothly change the voltage signal received by a control unit by setting a variable resistor unit capable of smoothly changing resistance, and the control unit controls the brightness of the lamp according to the voltage signal, thereby achieving stepless adjustment of the brightness of the household appliance lamp, thereby meeting the diverse usage requirements of users and greatly optimizing the user experience, and the components are easily available, the cost is low, and the setting is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic structural diagram of a household appliance lamp brightness adjustment circuit according to an embodiment of the present invention.

[0028] Figure 2 It is a structural schematic diagram of a variable resistor unit according to another embodiment of the present disclosure;

[0029] Figure 3 The present invention is a schematic diagram of the appearance of a household appliance according to another embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0031] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

[0032] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0033] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another component. Therefore, the first component discussed below can be referred to as the second component without departing from the teachings of the concepts of the present disclosure. As used in this disclosure, the term "and / or" includes any one of the associated listed items and all combinations of one or more.

[0034] Those skilled in the art will appreciate that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present disclosure, and therefore cannot be used to limit the protection scope of the present disclosure.

[0035] An embodiment of the present disclosure provides a circuit for adjusting the brightness of a lamp in a household appliance. The household appliance may specifically be an appliance such as an oven, a steamer or an integrated stove that has a cavity and a lamp is arranged in the cavity.

[0036] like Figure 1 As shown, the adjustment circuit includes a variable resistor unit 110 and a control unit 120. The first end of the variable resistor unit 110 is electrically connected to the power supply terminal VCC, the second end of the variable resistor unit 110 is electrically connected to the ground terminal GND, the variable resistor end 111 of the variable resistor unit 110 is electrically connected to the input end of the control unit 120, and the output end of the control unit 120 is used to be electrically connected to the lamp. The variable resistor unit 110 is used to transmit a stepless voltage adjustment signal to the control unit 120 based on the change of its resistance value. The control unit 120 is used to steplessly adjust the brightness of the lamp according to the stepless voltage adjustment signal.

[0037] Specifically, the variable resistor unit 110 uses the voltage division principle to infinitely change the voltage of the variable resistor end 111, that is, the voltage of the variable resistor end 111 can be changed smoothly and continuously. The variable resistor end 111 is electrically connected to the input end of the control unit 120, and transmits a voltage signal to the control unit 120. The control unit 120 is an MCU, a control chip and other components. Assuming that the voltage of the power supply end VCC is 5V, the input end of the control unit 120 can receive a voltage signal of 0 to 5V through the adjustment of the variable resistor unit 110. The control unit 120 outputs PWM waveforms with different duty cycles according to the voltage signal to control the brightness of the LED furnace lamp to achieve an infinite adjustment effect from off to the brightest. The logic in the control unit can be set to output a PWM waveform with a duty cycle of 0% when the voltage is 0, and a PWM waveform with a duty cycle of 0% when the voltage is 5V. It can also be reversed, and a PWM waveform with a duty cycle of 100% can be output when the received voltage is 0. The present disclosure is not limited here.

[0038] Exemplarily, the variable resistor unit includes a sliding resistor, and the sliding resistor includes a resistor sheet and a sliding contact. The two ends of the resistor sheet are electrically connected to the power supply terminal and the ground terminal respectively. The first end of the sliding contact is slidably connected to the resistor sheet, and the second end of the sliding contact is electrically connected to the input terminal of the control unit.

[0039] Specifically, the resistor sheet in the oven cavity shell can be in the shape of a long strip, with the two ends of the long strip resistor sheet being respectively end a and end b, one end of the sliding contact being in contact with the resistor sheet, and the other end of the sliding contact being end O. The sliding contact slides along the resistor sheet to adjust the resistance between Oa and Ob. A push rod or other components can be arranged outside the cavity to be fixedly connected to the sliding contact, and the user can operate the push rod to slide left and right on the cavity shell, thereby adjusting the brightness of the lamp.

[0040] In some embodiments, the resistor sheet can also be replaced with a resistor wire, which has a tight spiral structure similar to a spring, with its first and last ends being respectively set as end a or end b.

[0041] It is understandable that the resistor sheet or resistor wire is not limited to a long strip shape. To achieve the technical effect of the present disclosure, it is only necessary that the resistor sheet or resistor wire has two ends, which are respectively connected to the power supply end and the ground end, and the sliding contact can be moved between the two ends.

[0042] Exemplarily, the sliding rheostat is a rotary sliding rheostat, and the adjustment circuit further includes an adjustment knob, which is rotatably disposed outside the cavity and connected to the rotary sliding rheostat.

[0043] Specifically, Figure 2 As shown, the rotary sliding rheostat comprises a resistor sheet 210 and a sliding contact 220. The resistor sheet 210 is an open circular ring. When the power supply is 5V, the resistance value of the resistor sheet 210 can be 10kΩ. Figure 1 , the two ends a and b of the resistor 210 are electrically connected to the power supply terminal VCC and the ground terminal GND respectively, the first end of the sliding contact 220 is slidingly connected to the resistor 210, and the second end O of the sliding contact 220 is electrically connected to the input end of the control unit 120. Assuming that the a end is connected to the power supply terminal VCC, the b end is connected to the ground terminal GND, and in the process of the sliding contact 220 rotating and sliding from the a end of the resistor 210 to the b end, the resistance between Oa increases from 0 to 10 kΩ, and the resistance between Ob decreases, and the voltage received by the input end of the control unit 120 increases, so that the lamp becomes brighter and brighter, and reaches the maximum brightness when the sliding contact 220 slides to the b end.

[0044] The adjustment knob is rotatably arranged outside the cavity, and the resistor sheet, the sliding contact and other parts of the circuit are all arranged in the outer shell of the oven or steamer for protection. The adjustment knob is fixedly connected to the sliding contact, and the two are relatively stationary. When the user rotates the adjustment knob, the sliding contact is driven to rotate on the resistor sheet, thereby adjusting the brightness of the lamp.

[0045] Exemplarily, the circumference or end face of the adjustment knob is provided with a scale to mark the angle of rotation. The scale can be directly marked with degrees or with percentages from 0% to 100% to indicate brightness. The scale can be engraved on the end face of the knob or engraved on the side in the circumference, and indicator marks such as arrows, dots, etc. can be engraved on the outer surface of the oven around the knob to indicate the current scale. The scale can also be engraved on the outer surface of the oven, and the indicator marks can be engraved on the end face or side face of the adjustment knob to achieve the same effect. Users can quantify the brightness of the light through the scale, making it more convenient and intuitive for users to use.

[0046] Exemplarily, the sliding rheostat is a rotary sliding rheostat, and the adjustment circuit further includes an angle sensor. The angle sensor is rotatably disposed outside the cavity, and the angle sensor is connected to the rotary sliding rheostat.

[0047] Specifically, the angle sensor can be calibrated to 0° when the lamp is turned off. The angle sensor outputs an angle signal to a display device, such as an electronic display screen on the outer surface of the oven, to display the rotation angle or the percentage of the light brightness, which is convenient for users to view and adjust the light brightness more intuitively.

[0048] For example, Figure 1 As shown, the adjustment circuit further includes a current limiting unit 130 . A first end of the current limiting unit 130 is electrically connected to the variable resistance end 111 of the variable resistance unit 110 , and a second end of the current limiting unit 130 is electrically connected to the input end of the control unit 120 .

[0049] Specifically, the current limiting unit 130 includes a current limiting resistor, which is connected in series between the variable resistor end 111 of the variable resistor unit 110 and the control unit 120 to limit the current in the branch to prevent the control unit 120 from being burned out by excessive current. At the same time, the current limiting unit 130 can also play a voltage dividing role, dividing the voltage for the control unit 120 to prevent the control unit 120 from overvoltage. The resistance value of the current limiting resistor needs to be designed according to the maximum current that the control unit 120 can withstand. First, the working voltage at both ends of the control unit 120 is measured, and then the working voltage of the control unit 120 is subtracted from the power supply voltage, and divided by the maximum current that can be sustained, to obtain the minimum allowable resistance value of the current limiting resistor.

[0050] For example, Figure 1 As shown, the adjustment circuit further includes a pull-down unit 140. A first end of the pull-down unit 140 is electrically connected to a first end of the current limiting unit 130, and a second end of the pull-down unit 140 is electrically connected to the ground terminal GND.

[0051] Specifically, the pull-down unit 140 includes a pull-down resistor. The control unit 120 usually uses components such as MCU and control chip, and the input end of the control unit 120 is grounded through the pull-down unit 140, so that when there is no high-level input, the input end can be stably at a low-level window sill to prevent the occurrence of high-level interference from causing the control unit 120 to malfunction. If there is no pull-down unit 140, the input end of the control unit 120 is suspended and has high impedance. External high-level interference can easily be added to the control unit 120 from the input end, thereby causing the control unit 120 to malfunction. When the power supply voltage is 5V, the value of the pull-down resistor is generally 100Ω~470Ω. Since the resistance value is very small, various high-level interferences at the input end of the control unit 120 will be short-to-ground, and the pull-down unit 140 can achieve the purpose of anti-interference at the same time.

[0052] For example, Figure 1 As shown, the adjustment circuit further includes an anti-interference unit 150. A first end of the anti-interference unit 150 is electrically connected to the input end of the control unit 120, and a second end of the anti-interference unit 150 is electrically connected to the ground end GND.

[0053] Specifically, the anti-interference unit 150 includes an anti-interference capacitor. The input end of the control unit 120 is grounded through the anti-interference unit 150, which can filter out high-frequency signals in the circuit and play an anti-interference role for the control unit 120. Due to the AC-passing and DC-resistance characteristics of the capacitor, the fluctuating signal in the DC circuit will be consumed by the capacitor, thereby making the voltage more stable and ensuring the stability and quality of signal transmission.

[0054] A household appliance lamp brightness adjustment circuit according to an embodiment of the present disclosure smoothly changes the voltage signal received by a control unit by setting a variable resistor unit capable of smoothly changing resistance. The control unit controls the brightness of the lamp according to the voltage signal, thereby achieving stepless adjustment of the brightness of the household appliance lamp, thereby meeting the diverse usage requirements of users and greatly optimizing the user experience. In addition, the components are easily available, the cost is low, and the setting is simple.

[0055] Another embodiment of the present disclosure provides a household appliance, the household appliance comprising a cavity and a lamp arranged in the cavity, and the adjustment circuit described in the previous embodiment. The output end of the control unit in the adjustment circuit is electrically connected to the lamp for adjusting the brightness of the lamp.

[0056] Specifically, as an example, Figure 3The figure shows an oven, in which a lamp 31 is provided in the cavity, and the panel of the cavity shell has a display screen 33 and an operating knob 34 for adjusting the firepower in addition to an adjustment knob 32. Referring to the previous embodiment, the adjustment knob 32 is connected to the sliding contact in the shell. By rotating the adjustment knob 32, the sliding contact slides on the resistor sheet, and the voltage signal input to the control unit in the oven is adjusted by the voltage division principle. The control unit sends a PWM waveform according to the voltage signal to control the brightness of the lamp 31 in the cavity. The angle sensor outputs a signal to the display screen 33, so that the user can intuitively know the rotation angle of the adjustment knob 32 and the brightness of the light in the oven cavity, so as to make better adjustments. In addition, the rotation angle of the operating knob 34 can also be transmitted to the display screen 33 by another angle sensor to facilitate user operation.

[0057] A household appliance of the disclosed embodiment can smoothly change the voltage signal received by the control unit by using a household appliance lamp brightness adjustment circuit of the previous embodiment, and the control unit controls the brightness of the lamp according to the voltage signal, thereby realizing stepless adjustment of the brightness of the household appliance lamp, thereby meeting the diverse usage needs of users, greatly optimizing the user experience, and the components are easy to obtain, the cost is low, and the setting is simple.

[0058] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A household appliance lamp brightness adjustment circuit, the household appliance comprising a cavity and the lamp arranged in the cavity, characterized in that: The adjustment circuit includes a variable resistance unit and a control unit; The first end of the variable resistor unit is electrically connected to the power supply end, the second end of the variable resistor unit is electrically connected to the ground end, the variable resistor end of the variable resistor unit is electrically connected to the input end of the control unit, and the output end of the control unit is used to be electrically connected to the lamp; The variable resistor unit is used to transmit a stepless voltage adjustment signal to the control unit based on the change of its resistance value; The control unit is used to steplessly adjust the brightness of the lamp according to the stepless voltage adjustment signal.

2. The adjustment circuit according to claim 1, characterized in that: The variable resistor unit includes a sliding resistor, and the sliding resistor includes a resistor sheet and a sliding contact; Two ends of the resistor are electrically connected to the power supply end and the ground end respectively; The first end of the sliding contact is slidably connected to the resistor, and the second end of the sliding contact is electrically connected to the input end of the control unit.

3. The adjustment circuit according to claim 2, characterized in that: The sliding rheostat is a rotary sliding rheostat; the adjustment circuit also includes an adjustment knob; The adjusting knob is rotatably arranged outside the cavity, and the adjusting knob is connected to the rotary sliding rheostat.

4. The adjustment circuit according to claim 3, characterized in that: The circumference or end surface of the adjusting knob is provided with scales.

5. The adjustment circuit according to claim 2, characterized in that: The sliding rheostat is a rotary sliding rheostat, and the adjustment circuit also includes an angle sensor; The angle sensor is rotatably arranged outside the cavity, and the angle sensor is connected to the rotary sliding rheostat.

6. The adjustment circuit according to any one of claims 1 to 5, characterized in that: The adjustment circuit also includes a current limiting unit; The first end of the current limiting unit is electrically connected to the variable resistance end of the variable resistance unit, and the second end of the current limiting unit is electrically connected to the input end of the control unit.

7. The adjustment circuit according to claim 6, characterized in that: The adjustment circuit also includes a pull-down unit; The first end of the pull-down unit is electrically connected to the first end of the current limiting unit, and the second end of the pull-down unit is electrically connected to the ground end.

8. The adjustment circuit according to any one of claims 1 to 5, characterized in that: The adjustment circuit also includes an anti-interference unit; The first end of the anti-interference unit is electrically connected to the input end of the control unit, and the second end of the anti-interference unit is electrically connected to the ground end.

9. The adjustment circuit according to claim 8, characterized in that: The anti-interference unit includes an anti-interference capacitor.

10. A household appliance, comprising a cavity and a lamp arranged in the cavity, characterized in that: The household appliance further comprises the adjustment circuit according to any one of claims 1 to 9; The output end of the control unit is electrically connected to the lamp and is used to adjust the brightness of the lamp.

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