CN215446595U

CN215446595U - Fume exhaust fan

Info

Publication number: CN215446595U
Application number: CN202121691315.7U
Authority: CN
Inventors: 陈建平
Original assignee: Zhejiang Supor Kitchen and Bathroom Electrical Appliance Co Ltd
Current assignee: Zhejiang Supor Kitchen and Bathroom Electrical Appliance Co Ltd
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2022-01-07
Anticipated expiration: 2031-07-23

Abstract

The utility model provides a range hood. This lampblack absorber includes lamp plate, power control circuit and operative member. The lamp panel includes warm light lamp and cold light lamp. The power supply control circuit is electrically connected with the warm light lamp through the first circuit and is electrically connected with the cold light lamp through the second circuit. The power supply control circuit is used for controllably supplying power to the warm light lamp and/or the cold light lamp respectively. And the operable piece is electrically connected with the power supply control circuit and used for responding to the operation of a user to send a control signal to the power supply control circuit so as to control the power supply of the warm light lamp and/or the cold light lamp. According to the technical scheme, the power supply control circuit can supply power to the warm light lamp and/or the cold light lamp on the lamp panel in a controllable mode, and therefore the power supply duration of the warm light lamp and/or the cold light lamp is adjusted. The range hood can provide light sources with different color temperatures for users. From this, the user can adjust the colour temperature of lamp plate as required, has satisfied user's different individual demands, and then can provide different culinary art scenes for the user, has promoted user's use and has experienced.

Description

Fume exhaust fan

Technical Field

The utility model relates to the technical field of kitchen appliances, in particular to a range hood.

Background

The range hood is provided with the illuminating lamp which can provide a light source for the user in the cooking process.

At present, the lighting lamps on most range hoods in the market adopt Light Emitting Diode (LED) patches or lamp beads with small areas. The range hood provides a light source by utilizing the direct irradiation mode.

However, the lighting lamp on the existing cigarette making machine is set when leaving the factory, and the lighting lamp is difficult to adjust by a user and to select the lighting property according to the use environment and personal preference.

SUMMERY OF THE UTILITY MODEL

To at least partially solve the problems occurring in the prior art, according to an aspect of the present invention, there is provided a range hood. This lampblack absorber includes lamp plate, power control circuit and operative member. The lamp panel includes warm light lamp and cold light lamp. The power supply control circuit is electrically connected with the warm light lamp through the first circuit and is electrically connected with the cold light lamp through the second circuit. The power supply control circuit is used for controllably supplying power to the warm light lamp and/or the cold light lamp respectively. The operable member is electrically connected to the power control circuit for sending a control signal to the power control circuit in response to a user operation to control the supply of power to the warm light lamp and/or the cold light lamp.

According to the technical scheme, the power supply control circuit can supply power to the warm light lamp and/or the cold light lamp on the lamp panel in a controllable mode, and therefore the power supply duration of the warm light lamp and/or the cold light lamp is adjusted. The range hood can provide light sources with different color temperatures for users. From this, the user can adjust the colour temperature of lamp plate as required, has satisfied user's different individual demands, and then can provide different culinary art scenes for the user, has promoted user's use and has experienced.

Illustratively, the power control circuit is provided with a power port and a control port. The warm light is connected between the power supply port and the grounding end through the first circuit. The cold light lamp is connected between the power supply port and the ground terminal through a second circuit. The control port is connected with at least one circuit in the first circuit and the second circuit and used for controlling the conduction and the cut-off of the at least one circuit.

Therefore, the control of the circuit where the warm light lamp and/or the cold light lamp are/is located can be realized through the control port of the power supply control circuit. The method has better stability and lower cost.

Illustratively, the control port is a Pulse Width Modulation (PWM) port.

Therefore, the color temperature of the lamp panel is controlled by sending the PWM signal through the PWM port, the anti-interference performance is stronger, and the realization is easier.

Illustratively, the control ports include complementary first and second pulse width modulation ports. The first pulse width modulation port is connected with the first circuit, and the second pulse width modulation port is connected with the second circuit.

Therefore, the technical scheme can realize uniform and effective conversion from cold light to warm light or from warm light to cold light, and further ensures the use experience of users.

Illustratively, the first circuit includes a plurality of first branches and first field effect transistors. Each first branch is connected with the same number of warm light lamps. The first branch is also provided with a first current limiting resistor. The same number of warm light lamps and the first current limiting resistor are connected in series. The plurality of first branches are connected in parallel to constitute a first parallel circuit. The first field effect transistor is connected in series with the first parallel circuit. The first pulse modulation port is connected with the first field effect transistor. The second circuit includes a plurality of second branches and second field effect transistors. Each second branch is connected with the same number of cold light lamps. And a second current limiting resistor is also arranged on the second branch circuit. The same number of cold light lamps are connected in series with the second current limiting resistor. The plurality of second branches are connected in parallel to constitute a second parallel circuit. The second field effect transistor is connected in series with the second parallel circuit. The second pulse modulation port is connected with a second field effect transistor.

The first circuit and the second circuit with the circuit structure can effectively ensure that the power control circuit accurately controls the light emitting conditions of the warm light lamp and the cold light lamp. In addition, the current limiting resistor can effectively reduce the current flowing through the warm light lamp and/or the cold light lamp, and damage of the warm light lamp and/or the cold light lamp is avoided. Thereby preventing the loss of the user's interest.

Illustratively, the power control circuit provides 12 volts of power. Every first branch road connects 3 warm light lamps, and every second branch road connects 3 cold light lamps.

In a word, the scheme is compatible with the power panel of the existing cigarette machine. When the power supply is 12V, the voltage is divided equally more reasonably by selecting the three lamp series connection. The power waste can not be caused, and the luminous effect of the lamp beads can not be influenced.

Illustratively, the first circuit and the second circuit collectively comprise the same shared circuit segment. The first circuit further includes a first circuit segment and the second circuit further includes a second circuit segment. The first circuit segment and the second circuit segment are connected in parallel. And a third field effect transistor is arranged on the shared circuit section. The control port includes a third pulse width modulation port. The third pulse width modulation port is connected with a third field effect transistor.

According to the technical scheme, the mutual interference of the adjustment processes of the color temperature and the brightness can be avoided, and the accurate control and adjustment of the color temperature and the brightness can be realized.

Illustratively, the range hood further comprises a memory. The power supply control circuit is electrically connected with the memory. The power supply control circuit is also used for storing the power supply control parameters of the warm light lamp and the cold light lamp in the memory.

Therefore, the personalized customization is met, the operation of the user can be reduced, the use burden of the user is reduced, and the use experience of the user is improved.

Exemplarily, the warm light lamp and the cold light lamp are uniformly arranged on the lamp panel.

In above-mentioned technical scheme, warm light lamp and cold light lamp evenly distributed on the lamp plate. Therefore, the light rays emitted by the light sources with two color temperatures are uniform, and the phenomena that the illumination brightness of the light source at a certain position is too high or the color temperature is too high are avoided. Therefore, the eyesight health of the user is guaranteed, and the use experience of the user is improved.

Illustratively, the number of warm light lamps is the same as the number of cold light lamps.

When the number of the warm light lamps is the same as that of the cold light lamps, the color temperature balance and coordination can be ensured. Avoid the light of lamp plate too far to be inclined to the blue light or too far to be inclined to the red, promoted user's use and experienced.

A series of concepts in a simplified form are introduced in the disclosure, which will be described in further detail in the detailed description section. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The advantages and features of the present invention are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings of the utility model are included to provide a further understanding of the utility model. The drawings illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model. In the drawings, there is shown in the drawings,

fig. 1 shows a structure diagram of a lamp panel of a range hood in the prior art;

FIG. 2 shows a schematic block diagram of a range hood according to an embodiment of the utility model;

fig. 3 illustrates a structural view of a lamp panel of a range hood according to an embodiment of the present invention;

FIG. 4 illustrates an operable member of a range hood according to one embodiment of the present invention;

FIG. 5 shows a schematic diagram of a portion of a power control circuit of a range hood according to one embodiment of the utility model; and

fig. 6 shows a schematic diagram of a first circuit and a second circuit of a range hood according to an embodiment of the utility model.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the present invention. One skilled in the art, however, will understand that the following description merely illustrates a preferred embodiment of the utility model and that the utility model may be practiced without one or more of these details. In other instances, well known features have not been described in detail so as not to obscure the utility model.

Fig. 1 shows a structure diagram of a lamp panel of a range hood in the prior art. As shown in fig. 1, there are 6 × 5 beads on the lamp panel. The lamp beads are the same, or all are cold light lamps, or all are warm light lamps. When the user switches on the illuminating lamp, the color temperature of the illuminating lamp cannot be adjusted, personal preference is difficult to meet, and user experience is poor. In order to solve the technical problem, according to an aspect of the present invention, there is provided a range hood. Fig. 2 shows a schematic block diagram of a range hood according to an embodiment of the present invention. As shown in fig. 2, the range hood includes a lamp panel 230, a power control circuit 220, and an operable piece 210.

The lamp panel 230 includes a warm light and a cold light. It will be appreciated that the main difference between a warm light lamp and a cold light lamp is the color temperature of the emitted light. Generally, a warm light lamp emits light more red, and a cold light lamp emits light more blue. When the color temperature is below 3000 kelvin, the color of the light is reddish, which may be referred to as warm light. When the color temperature exceeds 5000 Kelvin, the color of the light is bluish, which may be called luminescence.

Fig. 3 shows a structural view of a lamp panel 230 of a range hood according to an embodiment of the present invention. In the embodiment shown in fig. 3, there are 6 × 10 light beads on the lamp panel 230. The warm light lamp and the cold light lamp can be uniformly arranged on the lamp panel 230. Wherein, two adjacent lamp pearls can have different colour temperatures. Specifically, when the first row is a warm light, the second row is a cold light, the third row is a warm light, and so on, the lamp panel 230 shown in fig. 3 is formed. In this embodiment, the number of warm light lamps and the number of cold light lamps are the same. The number of the warm light lamps and the number of the cold light lamps are respectively 30. In practice, however, there is no necessary correlation between the distribution and number of the warm and cold lamps. When the warm light lamp and the cold light lamp are evenly arranged on the lamp panel 230, the number relationship between the warm light lamp and the cold light lamp can be equal or unequal. On the contrary, when the number of the warm light lamps and the number of the cold light lamps are equal, whether the warm light lamps and the cold light lamps are uniformly distributed or not is not influenced.

In the above technical scheme, the warm light lamp and the cold light lamp are uniformly distributed on the lamp panel 230. Therefore, the light rays emitted by the light sources with two color temperatures are uniform, and the phenomena that the illumination brightness of the light source at a certain position is too bright or the color temperature is too high or too low and the like are avoided. Therefore, the eyesight health of the user is guaranteed, and the use experience of the user is improved. In addition, when the number of the warm light lamps is the same as that of the cold light lamps, the color temperature balance and coordination can be ensured. Avoid lamp plate 230's light too blue or too red partially, promoted user's use and experienced.

Alternatively, the warm light lamps and the cold light lamps may be randomly distributed, and the number thereof may be different. The specific arrangement and number of the lamp beads are not limited at all. For example, more or fewer warm light lamps and/or cold light lamps may be provided depending on the lighting needs. The number of the warm light lamps and the cold light lamps may be the same or different. For example, the number of warm light lamps may be greater than the number of cold light lamps in order to beautify the color of food on the cooktop, stimulating the appetite of the user. The above scheme is merely exemplary. The lamp panel 230 can be set according to the needs of a general user before leaving the factory.

It can be understood that warm light lamp and cold light lamp can be realized with lamp pearl or lamp area. Lamp panel 230 may also include a light holder and a frosted light-transmitting panel connected to the light holder, both of which form a cavity. The warm light lamp and the cold light lamp are arranged on the lamp holder and are positioned in the cavity. One side of the frosted light-transmitting plate facing the lamp is a frosted surface, and the other side of the frosted light-transmitting plate is a polished surface. For example, the warm light lamp and the cold light lamp can be realized by the lamp beads, and the lamp beads are light sources of the dot matrix, so that the light intensity of the light-emitting points is possibly high when the light-emitting points irradiate, and the light intensities of other positions are relatively low. This not only affects the user experience, but may also be detrimental to the user's physical health. After the frosted light-transmitting plate is arranged, light emitted by the warm light lamp and the cold light lamp can be subjected to diffuse reflection, so that light emitted by the lamp panel 230 is distributed more uniformly and the illumination brightness of the light is not influenced.

Referring again to fig. 2, the power control circuit 220 is electrically connected to the warm lamp through a first circuit and to the cold lamp through a second circuit. The power control circuit 220 is used to controllably power the warm light and/or the cold light, respectively. It is understood that the power control circuit 220 may include a power board having a power port disposed thereon. One end of the warm light lamp and the cold light lamp may be connected to the power supply port. The other ends of the warm light lamp and the cold light lamp can be connected with a grounding terminal. It will be appreciated that the power control circuit 220 may provide both power and control functions. The control function can be realized by a circuit formed by a plurality of electronic elements, and can also be realized by a device which can realize the control function, such as an integrated chip or a singlechip. For example, the on/off of the warm light and/or the cold light may be controlled by controlling the on/off of the first circuit and/or the second circuit. Alternatively, the warm light and/or the cold light may be directly provided with a controlled power signal, thereby controlling the on/off of the warm light and/or the cold light. The voltage value of the power supply that the power supply control circuit 220 can provide for the warm light lamp and/or the cold light lamp can be, for example, 5 volts, 12 volts, etc.

It can be understood that different warm light lamps and/or cold light lamps can emit light or extinguish for different durations, which can affect the color temperature of the lamp panel 230. For example, in one period, the longer all the warm light lamps emit light than all the cold light lamps, the lower the color temperature of the lamp panel 230 is; otherwise, the other way round. Alternatively, different warm light lamps and/or cold light lamps can be controlled to emit light, and the more the number of the warm light lamps emitting light is, the less the number of the cold light lamps is, and the lower the color temperature of the lamp panel 230 is; otherwise, the other way round. The power control circuit 220 can adjust the color temperature of the lamp panel 230 by controlling the power supply of the warm light lamp and/or the cold light lamp.

The operable member 210 is electrically connected to the power control circuit 220 for transmitting a control signal to the power control circuit 220 in response to a user's operation to control the supply of power to the warm light and/or the cold light. Fig. 4 illustrates an operable member 210 according to one embodiment of the present invention. As shown in fig. 4, the operable element 210 includes a power supply terminal, a ground terminal, a signal transmission port SEND terminal, and the like. The SEND terminal is connected to the power control circuit 220, and different control signals can be sent to the power control circuit 220 for different user operations. The control signal is used to control the power control circuit 220 to control the power supply of the warm light and/or the cold light through the power control circuit 220. The power source terminal may be directly connected to the power board to supply power to the operable member 210. Illustratively, the operable piece 210 may be a key provided on an operation panel of the range hood, which may be one or more. For example, when the operable member 210 is one, the user performs one pressing operation thereon, and the power control circuit 220 may be controlled to adjust the power supply of the warm light and/or the cold light to increase the color temperature. When the user continuously presses the button twice, the power control circuit 220 can be controlled to adjust the power supply of the warm light and/or the cold light so as to reduce the color temperature. For another example, when the two operable pieces 210 are provided, the user may operate the two operable pieces to control the power supply of the warm light lamp and/or the cold light lamp, respectively, to increase or decrease the color temperature.

According to the above technical scheme, the power control circuit 220 may controllably supply power to the warm light and/or the cold light on the lamp panel 230, thereby adjusting the power supply duration of the warm light and/or the cold light. The range hood can provide light sources with different color temperatures for users. From this, the user can adjust the colour temperature of lamp plate 230 as required, has satisfied user's different individual demands, and then can provide different culinary art scenes for the user, has promoted user's use and has experienced.

Fig. 5 shows a schematic diagram of a portion of a power control circuit 220 according to one embodiment of the utility model. In this embodiment, the control portion of the power control circuit 220 is implemented by a single chip microcomputer. As shown in fig. 5, the power supply control circuit 220 is provided with control ports (PWM1, PWM2, and PWM3 ports). The power control circuit 220 is further provided with a power input port VCC terminal, a ground terminal GND terminal, a signal receiving port REC terminal connected to the operable element 210, and the like. The VCC end can be connected to the power panel. Through which a direct current, for example at a voltage of 5 volts, can be supplied to the single-chip. It is understood that the power control circuit 220 may be provided with a power port (not shown in fig. 5). The warm light lamp may be connected between the power supply port and the ground terminal through the first circuit. The cold light lamp may also be connected between the power supply port and the ground terminal via a second circuit. As described above, the power supply port may output, for example, 5 or 12 volts dc to power a warm or cold light lamp. The control port may be connected to at least one of the first circuit and the second circuit for controlling the switching on and off of the at least one connected circuit. Illustratively, the control port may output a circuit control signal such as a pulse signal to the first circuit and/or the second circuit. When the control port outputs a high level, the first circuit and/or the second circuit can be controlled to be conducted. When the control port outputs a low level, the first circuit and/or the second circuit can be controlled to be turned off. It can be understood that when the control port controls the first circuit to be turned on or off, the warm light can be correspondingly turned on or off. Similarly, when the control port controls the second circuit to be switched on or switched off, the cold light lamp can correspondingly emit light or extinguish.

Therefore, the control of the circuit where the warm light lamp and/or the cold light lamp is located can be realized through the control port of the power control circuit 220. The method has better stability and lower cost.

Alternatively, the control port may be a Pulse Width Modulation (PWM) port. The output control signal is a PWM signal, and the frequency of the PWM signal may be at least greater than 1000 hz, for example, any value between 1000 hz and 4000 hz. By adjusting the duty cycle of the PWM signal, i.e., adjusting the percentage of time that the high level in one period of the signal is a whole signal period, the brightness of the connected lamp can be controlled. When the duty ratio of the PWM signal is larger, the brightness of the corresponding controlled lamp may be made brighter. Conversely, when the duty ratio of the PWM signal is smaller, the brightness of the corresponding controlled lamp can be made darker. The brightness of the lamp may be divided into, for example, 10 steps, and each step corresponds to a brightness. The brightness corresponding to the first gear is darkest, then, every time the first gear is added, the corresponding brightness correspondingly brightens the first gear, and the brightness corresponding to the tenth gear is brightest. By adjusting the duty ratio of the PWM signal, the brightness of different gears can be obtained. It can be understood that the color temperature of the lamp panel 230 can be adjusted by adjusting the brightness of the warm light and/or the cold light. For example, the brighter the warm light lamp is, the lower the color temperature of the lamp panel 230 is; the brighter the cold light lamp is, the higher the color temperature of the lamp panel 230 is. For example, in the power control circuit 220 shown in fig. 5, there may be only one control port PWM1, which may be connected to the second circuit where the cold light lamp is located. The warm light of the light panel 230 is always fully on to provide the basic color temperature for the user. The color temperature of the lamp panel 230 can be adjusted by adjusting the light emitting duration of the cold light lamp. In the present application, no limitation is made on the control variation relationship between the duty ratio and the gear, and any reasonable control variation relationship is within the protection scope of the present application.

Therefore, the color temperature of the lamp panel 230 is controlled by sending the PWM signal through the PWM port, the anti-interference performance is stronger, and the realization is easier.

Illustratively, the control ports may include complementary first and second pulse width modulation ports. The first pulse modulation port (PWM1 port in fig. 5) is connected to the first circuit. The second PWM port (PWM 2 port in fig. 5) is connected to the second circuit. It is to be understood that the complementary here may mean that the signal edges of the first PWM signal output through the first PWM port and the second PWM signal output through the second PWM port are aligned and the high and low levels are opposite. That is, when the first PWM signal is at a high level, the second PWM signal is at a low level; when the first PWM signal is low, the second PWM signal is high. As described above, the brightness of the correspondingly controlled lamp can be adjusted by adjusting the duty ratio of the PWM signal. In this embodiment, since the first PWM signal and the second PWM signal are complementary, the duty cycle of the first PWM signal is increased, and correspondingly, the duty cycle of the second PWM signal is decreased; and vice versa. The frequencies of the first PWM signal and the second PWM signal may be any value between 50 khz and 100 khz. Therefore, no stroboflash is ensured in the process of adjusting the color temperature. Illustratively, the color temperature of the light source is warmer when the duty cycle of the first PWM signal is larger. And when the duty ratio of the second PWM signal is larger, the color temperature of the light source is cooler. Similarly to the brightness of the light source, the color temperature of the light source can be divided into 10 steps, and each step corresponds to one color temperature. For example, the color temperature corresponding to the first gear is the warmest, and then, every time the first gear is added, the corresponding color temperature correspondingly becomes cooler for the first gear, and the color temperature corresponding to the tenth gear is the coldest. By adjusting the duty ratio of the first PWM signal and the second PWM signal, the color temperature of different gears can be obtained.

Fig. 6 shows a circuit diagram of a first circuit 601 and a second circuit 602 according to an embodiment of the utility model. As shown in fig. 6, the first circuit 601 includes a plurality of first branches and first fets Q5. The first circuit 601 may be connected to a power port and a ground terminal. As described above, the first circuit 601 is connected to the power control circuit 220, and the power control circuit 220 may supply, for example, 5V or 12V dc power to the lamp. In one embodiment, the power control circuit 220 provides 12V power. Each first branch is connected with the same number of, for example, three, warm light lamps. The series L1, L5, L9 as shown in fig. 6 may be connected on one of the first branches. Generally, the dc voltage output by the power panel of the power control circuit 220 is about 12V, and the maximum rated voltage of the lamp bead is 3.3V. In a word, when the power supply is 12V, the voltage is divided equally by selecting the three lamp series connection more reasonably. The power waste can not be caused, and the luminous effect of the lamp beads can not be influenced. Illustratively, the first branch 601 is further provided with first current limiting resistors R1, R2, and the like. The same number of warm light lamps and the first current limiting resistor are connected in series. The resistance of the first current-limiting resistor may be set according to the rated voltage of the warm light lamp, and is not limited herein. The plurality of first branches are connected in parallel to constitute a first parallel circuit. The number of the first branches can be determined according to the maximum illumination brightness required by the range hood. It can be understood that the greater the maximum illumination brightness required by the range hood, the greater the number of first branches. Conversely, the smaller the maximum illumination brightness required by the range hood, the smaller the number of the first branches. The first field effect transistor Q5 is connected in series with the first parallel circuit. The first pulse modulation port is connected with the first field effect transistor. The first fet Q5 can be regarded as an electronic switch. When the first PWM signal output from the first pulse modulation port is at a high level, the first fet Q5 is turned on, and the "switch" is closed. Conversely, the first fet Q5 is turned off and the "switch" is turned off. Thus, when the first fet Q5 is turned on, the warm light can be illuminated by the power supply of the power control circuit 220.

Similarly, the second circuit 602 may also be connected to a power port and a ground. The second circuit 602 includes a plurality of second branches and second fets Q6. Each second branch is connected with the same number of cold light lamps. The second branch is also provided with second current limiting resistors R3, R4 and the like. The same number of cold light lamps are connected in series with the second current limiting resistor. The plurality of second branches are connected in parallel to constitute a second parallel circuit. The second field effect transistor is connected in series with the second parallel circuit. The second pulse modulation port is connected with a second field effect transistor. The related information of each element and specific connection in the second circuit 602 is similar to that of the first circuit, and is not repeated herein for brevity.

The first circuit 601 and the second circuit 602 having the above circuit structures can effectively ensure that the power control circuit 220 accurately controls the light emitting conditions of the warm light lamp and the cold light lamp. In addition, the current limiting resistor can effectively reduce the current flowing through the warm light lamp and/or the cold light lamp, and damage of the warm light lamp and/or the cold light lamp is avoided. Thereby preventing the loss of the user's interest.

Illustratively, the first circuit 601 and the second circuit 602 may also collectively include the same shared circuit segment. As shown in fig. 6, the shared circuit segment may be a circuit segment from a connection point of the source stages of the first fet and the second fet to a ground terminal. The first circuit 601 further comprises a first circuit segment connected in series with the shared circuit segment. The first circuit segment may be a circuit segment from the power port to the source stop of the first fet Q5. The second circuit 602 also includes a second circuit segment that is also shared with the shared circuit segment. The second circuit 602 may be a circuit segment from the power port to the source stop of the second fet Q6. The first circuit segment and the second circuit segment are connected in parallel. Thereby, the on and off of the first circuit 601 and the second circuit 602 can be collectively controlled by sharing the circuit segment. And a third field effect transistor Q10 is arranged on the shared circuit section. The control port includes a third pulse width modulation port (PWM 3 port in fig. 5). The third pulse width modulation port is connected with a third field effect transistor Q10. The third fet Q10 may also be considered an electronic switch, similar to the first and second fets. When the third PWM signal outputted from the third PWM port is at a high level, the third fet Q10 is turned on. Otherwise, it is cut off. When the third fet Q10 is off, the first circuit or the second circuit is off regardless of whether the first or second fet is on. In addition, the brightness of the warm light and the brightness of the cold light can be correspondingly adjusted by adjusting the duty ratio of the third PWM signal, which has been described in detail above and will not be described herein again. In general, the frequency of the third PWM signal may be any value between 1000 hz and 4000 hz. The frequency may be less than the frequency of the first and second PWM signals.

According to the technical scheme, not only can stroboflash be avoided in the adjusting process, but also mutual interference of the adjusting processes of the color temperature and the brightness can be avoided, and accurate control and adjustment of the color temperature and the brightness are realized.

Preferably, the range hood may further include a memory. The power control circuit 220 is electrically connected to the memory. Illustratively, the memory may be an Erasable Programmable Read Only Memory (EPROM), a USB memory, or the like. The power control circuit 220 is also used to store the power control parameters of the warm light and the cold light in the memory. The power control parameter may include parameters such as a duty ratio and a period of a circuit control signal output by the power control circuit 220. When the memory stores the power control parameters, the light emitting condition of the light source corresponding to the parameters can be recorded. The user can adjust the color temperature and brightness of the lamp panel 230 according to the specific use environment and/or personal preference. The light emitted by the light source of the lighting system of the extractor hood can be set by the user, best suited for the environment or the best preferred by the user when the extractor hood is used next time.

In the description of the present invention, it is to be understood that the directions or positional relationships indicated by the directional terms such as "front", "rear", "upper", "lower", "left", "right", "lateral", "vertical", "horizontal" and "top", "bottom", etc., are generally based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, and in the case of not making a reverse explanation, these directional terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the scope of the present invention; the terms "inner" and "outer" refer to the interior and exterior relative to the contours of the components themselves.

For ease of description, relative terms of regions such as "above … …", "above … …", "above … …", "above", and the like may be used herein to describe the regional positional relationship of one or more components or features with other components or features as illustrated in the figures. It is to be understood that the relative terms of the regions are intended to encompass not only the orientation of the element as depicted in the figures, but also different orientations in use or operation. For example, if an element in the drawings is turned over in its entirety, the articles "over" or "on" other elements or features will include the articles "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". Further, these components or features may also be positioned at various other angles (e.g., rotated 90 degrees or other angles), all of which are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, elements, components, and/or combinations thereof, unless the context clearly indicates otherwise.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the utility model to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A range hood, which comprises a lamp panel, a power supply control circuit and an operable piece, is characterized in that,

the lamp panel comprises a warm light lamp and a cold light lamp;

the power supply control circuit is electrically connected with the warm light lamp through a first circuit and electrically connected with the cold light lamp through a second circuit, and the power supply control circuit is used for controllably supplying power to the warm light lamp and/or the cold light lamp respectively; and

the operable piece is electrically connected with the power control circuit and used for responding to the operation of a user to send a control signal to the power control circuit so as to control the power supply of the warm light lamp and/or the cold light lamp.

2. The range hood of claim 1, wherein the power control circuit is provided with a power port and a control port, wherein the warm light lamp is connected between the power port and a ground terminal through the first circuit; the cold light lamp is connected between the power supply port and the grounding end through the second circuit; the control port is connected with at least one circuit in the first circuit and the second circuit and used for controlling the on and off of the at least one circuit.

3. A range hood as set forth in claim 2 wherein said control port is a pulse width modulation port.

4. A range hood as set forth in claim 3 wherein said control port includes complementary first and second pulse width modulation ports, said first pulse width modulation port being connected to said first circuit and said second pulse width modulation port being connected to said second circuit.

5. A range hood as claimed in claim 4,

the first circuit comprises a plurality of first branches and first field effect transistors, each first branch is connected with the same number of warm light lamps, a first current limiting resistor is further arranged on each first branch, the same number of warm light lamps are connected with the first current limiting resistors in series, the plurality of first branches are connected in parallel to form a first parallel circuit, the first field effect transistors are connected with the first parallel circuit in series, and a first pulse width modulation port is connected with the first field effect transistors;

the second circuit comprises a plurality of second branches and second field effect transistors, each second branch is connected with the cold light lamps in the same number, the second branches are further provided with second current-limiting resistors, the cold light lamps in the same number are connected with the second current-limiting resistors in series, the second branches are connected in parallel to form a second parallel circuit, the second field effect transistors are connected with the second parallel circuit in series, and the second pulse width modulation ports are connected with the second field effect transistors.

6. A range hood as set forth in claim 5, characterized in that said power control circuit provides 12 volt power, each first branch is connected with 3 warm light lamps, and each second branch is connected with 3 cold light lamps.

7. A range hood as claimed in any one of claims 2 to 6,

the first circuit with the second circuit includes same shared circuit section jointly, the first circuit still includes first circuit section, the second circuit still includes second circuit section, first circuit section with second circuit section parallel connection, be provided with the third field effect transistor in the shared circuit section, the control port includes third pulse width modulation port, third pulse width modulation port is connected the third field effect transistor.

8. A range hood as claimed in any one of claims 1 to 6, further comprising a memory, wherein said power control circuit is electrically connected to said memory, said power control circuit further being adapted to store power control parameters of said warm light lamp and said cold light lamp in said memory.

9. A range hood as claimed in any one of claims 1 to 6, wherein said warm light lamp and said cold light lamp are uniformly disposed on said lamp panel.

10. A range hood as claimed in any one of claims 1 to 6, characterized in that the number of said warm light lamps is the same as the number of said cold light lamps.