Lamp and household appliance

Abstract

The present disclosure relates to a lamp and a household appliance, the lamp is connected to a constant voltage source, and the lamp is provided with a brightness adjusting circuit; the brightness adjusting circuit comprises an electric conversion voltage regulating module; the electric conversion voltage regulating module is used for chopping an input first electric signal according to a preset frequency, and outputting a second electric signal after chopping to a lamp body; wherein an intensity waveform envelope line of the second electric signal corresponding to a change over time is consistent with an intensity waveform envelope line of the first electric signal corresponding to a change over time, and the preset frequency is greater than 2 times of a frequency of the first signal. The technical scheme provided by the present disclosure, compared with a scheme of adjusting brightness based on leading edge phase cutting or trailing edge phase cutting, through high-frequency chopping processing, the waveform envelope lines corresponding to the electric signals before and after chopping remain consistent, so that the waveform properties of the electric signals are not changed, and then the power factor can be improved, the harmonic pollution caused to the power grid is reduced, and the pollution problem to the power environment is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of intelligent lighting circuit, in particular to a lamp and a household appliance. BACKGROUND

[0002] In a scene requiring lighting, a lamp strip or a hard light bar can be used as a lighting lamp, which is usually powered by a constant voltage source. When the lighting lamp needs to adjust the brightness, the input voltage needs to be adjusted.

[0003] The current common way to adjust the input voltage includes leading edge phase cut or trailing edge phase cut of the power waveform of alternating current through thyristors or other power devices, that is, only the signal corresponding to the leading half wave or only the signal corresponding to the trailing half wave is retained in a cycle, thereby resulting in a low power factor and affecting the power grid harmonics and polluting the power environment. SUMMARY

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a lamp and a household appliance.

[0005] The present disclosure provides a lamp, which is connected to a constant voltage source and is configured with a brightness adjustment circuit; the brightness adjustment circuit comprises an electrical conversion voltage regulation module;

[0006] The electrical conversion voltage regulation module is configured to chop the input first electrical signal at a preset frequency and output a second electrical signal after chopping to a lamp body;

[0007] The envelope line of the intensity of the second electrical signal changing with time is consistent with the envelope line of the intensity of the first electrical signal changing with time, and the preset frequency is greater than 2 times the frequency of the first signal.

[0008] Optionally, the brightness adjustment circuit further comprises a rectifier module;

[0009] The rectifier module is integrated in the electrical conversion voltage regulation module; or the rectifier module is provided as a separate module device and is electrically connected to the electrical conversion voltage regulation module.

[0010] The rectifier module is connected to the input end of the electrical conversion voltage regulation module and is configured to rectify to form the first electrical signal; or the rectifier module is arranged at the output end of the electrical conversion voltage regulation module and is configured to rectify the second electrical signal.

[0011] Optionally, in the structure in which the rectifier module is arranged at the output end of the electrical conversion voltage regulation module, the rectifier module is integrated with the lamp body.

[0012] Optionally, the lamp further comprises a filter circuit, which is connected between the brightness adjustment circuit and the lamp body.

[0013] The filter circuit is used to stabilize the input voltage of the lamp body.

[0014] Optionally, the electric conversion voltage regulation module comprises a first power switch, a second power switch, a third power switch and a fourth power switch.

[0015] The input terminals of the first power switch and the third power switch are respectively connected to two input terminals of the electric conversion voltage regulation module; the output terminal of the first power switch is connected to the input terminal of the second power switch and to an output terminal of the electric conversion voltage regulation module; the output terminal of the third power switch is connected to the input terminal of the fourth power switch and to another output terminal of the electric conversion voltage regulation module; the output terminal of the second power switch is connected to the output terminal of the fourth power switch.

[0016] The control terminal of the first power switch inputs a first control signal, the control terminal of the second power switch inputs a second control signal, the control terminal of the third power switch inputs a third control signal, and the control terminal of the fourth power switch inputs a fourth control signal; the first control signal, the second control signal, the third control signal and the fourth control signal are used to control the on-off time sequence so that the electric conversion voltage regulation module converts the first electric signal into the second electric signal.

[0017] Optionally, the power switch comprises at least one of an N-channel field effect transistor, a P-channel field effect transistor, an insulated gate bipolar transistor and a triode.

[0018] The power switch comprises the first power switch, the second power switch, the third power switch and the fourth power switch.

[0019] Optionally, the types of the first power switch, the second power switch, the third power switch and the fourth power switch are the same.

[0020] Optionally, the electric conversion voltage regulation module further comprises an input detection sub-module, an output feedback detection sub-module, a dimming control signal sub-module and a signal processing sub-module.

[0021] The input detection submodule is connected with the input end of the electric conversion voltage regulation module, the output feedback detection submodule is connected with the output end of the electric conversion voltage regulation module, the input end of the signal processing submodule is connected with the input detection submodule, the output feedback detection submodule and the dimming control signal submodule, and the output end of the signal processing submodule is connected with the first power switch, the second power switch, the third power switch and the fourth power switch.

[0022] The input detection submodule is configured to detect the first electric signal and transmit a detection signal corresponding to the first electric signal to the signal processing submodule.

[0023] The output feedback detection submodule is configured to detect the second electric signal and transmit a detection signal corresponding to the second electric signal to the signal processing submodule.

[0024] The dimming control signal submodule is configured to transmit a dimming control signal to the signal processing submodule.

[0025] The signal processing submodule is configured to output the first control signal, the second control signal, the third control signal and the fourth control signal based on the detection signal corresponding to the first electric signal, the detection signal corresponding to the second electric signal and the dimming control signal.

[0026] Optionally, the dimming control signal comprises a digital pulse width modulation signal.

[0027] The present disclosure also provides a household appliance comprising any of the above lamps.

[0028] Compared with the prior art, the technical solutions provided by the present disclosure have the following advantages:

[0029] The lamp provided by the present disclosure is configured with a brightness adjustment circuit; wherein the brightness adjustment circuit comprises an electric conversion voltage regulation module; the electric conversion voltage regulation module is configured to chop the input first electric signal at a preset frequency and output the chopped second electric signal to the lamp body; wherein the envelope line of the waveform corresponding to the intensity of the second electric signal changing with time is consistent with the envelope line of the waveform corresponding to the intensity of the first electric signal changing with time, and the preset frequency is greater than 2 times the frequency of the first signal, so that high-frequency chopping processing can be realized; compared with the scheme of adjusting brightness based on leading-edge phase-cutting or trailing-edge phase-cutting, the envelope line of the waveform corresponding to the electric signal before and after chopping remains consistent through high-frequency chopping processing, so that the waveform properties of the electric signal are not changed, thereby the power factor can be improved, the harmonic pollution to the power grid can be reduced, and the pollution problem to the power environment can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present disclosure and, together with the description, further serve to explain the principles of the present disclosure.

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the accompanying drawings required by the embodiments or the prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0032] Figure 1 A structural schematic diagram of a lamp provided by the related art is shown in FIG. 1.

[0033] Figure 2 Another structural schematic diagram of a lamp provided by the related art is shown in FIG. 2.

[0034] Figure 3 A structural schematic diagram of a lamp provided by the embodiments of the present disclosure is shown in FIG. 3.

[0035] Figure 4 A comparison schematic diagram of a chopping front and back waveform envelope of a lamp provided by the embodiments of the present disclosure is shown in FIG. 4.

[0036] Figure 5 Another structural schematic diagram of a lamp provided by the embodiments of the present disclosure is shown in FIG. 5.

[0037] Figure 6 Another structural schematic diagram of a lamp provided by the embodiments of the present disclosure is shown in FIG. 6.

[0038] Figure 7 Another structural schematic diagram of a lamp provided by the embodiments of the present disclosure is shown in FIG. 7.

[0039] Figure 8 Another structural schematic diagram of a lamp provided by the embodiments of the present disclosure is shown in FIG. 8.

[0040] Figure 9 Another structural schematic diagram of a lamp provided by the embodiments of the present disclosure is shown in FIG. 9.

[0041] Figure 10 Another structural schematic diagram of a lamp provided by the embodiments of the present disclosure is shown in FIG. 10.

[0042] Figure 11 A structural schematic diagram of an electric conversion voltage regulating module in a lamp provided by the embodiments of the present disclosure is shown in FIG. 11.

[0043] Figure 12 A structural schematic diagram of a household appliance provided by the embodiments of the present disclosure is shown in FIG. 12.

[0044] Among them, in the related art: 01, AC-DC conversion module; 02, PWM chopper control module; 03, phase cutting circuit; 04, rectifier circuit; 05, lamp body;

[0045] In the embodiments of the present disclosure: 10, lamp; 100, lamp body; 20, constant voltage source; 11, brightness adjustment circuit; 111, electric conversion voltage regulation module; 112, rectifier module; 113, filter circuit; 31, first power switch; 32, second power switch; 33, third power switch; 34, fourth power switch; S1, first control signal; S2, second control signal; S3, third control signal; S4, fourth control signal; 35, input detection sub-module; 36, output feedback detection sub-module; 37, dimming control signal sub-module; 38, signal processing sub-module. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned purposes, features and advantages of the present disclosure, the schemes of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0047] In the following description, many specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, not all the embodiments.

[0048] First, combined with Figure 1 and Figure 2 The circuit structure related to the brightness adjustment of the lamp in the related art is exemplarily described.

[0049] Exemplarily, Figure 1 A structure diagram of a lamp provided by the related art is shown, which shows the structure of the lamp using phase cutting for brightness adjustment and the corresponding brightness adjustment principle. As Figure 1 shown, the constant voltage source provides an alternating current (shown as AC) electrical signal, which is supplied to the lamp body 05 after passing through the phase cutting circuit 03 and the rectifier circuit 04; wherein the phase cutting circuit 03 can use thyristor or other power devices, which performs front phase cutting or rear phase cutting on the power waveform of the alternating current, to obtain a signal retaining the front half-wave or rear half-wave; wherein the rectifier circuit 04 rectifies the signal after phase cutting, converts the alternating current signal into a direct current signal, and supplies power to the lamp body 05. In this lamp brightness adjustment mode, the front or rear phase cutting is performed on the alternating current signal to realize chopper voltage regulation of the alternating current signal, and then the lamp body 05 is input through the rectifier circuit 04; because the waveform of the electrical signal is adjusted, it results in low power factor, affects the power grid harmonic, and pollutes the power environment.

[0050] For example, Figure 2 A schematic diagram of another type of lamp provided for related technology illustrates the structure of a lamp that uses AC-DC conversion combined with chopping for brightness adjustment and the corresponding brightness adjustment principle. For example... Figure 2 As shown, the AC signal provided by the constant voltage source powers the lamp body 05 after passing through the AC-DC conversion module 01 and the PWM chopper control module 02. The AC-DC conversion module 01, also known as an AC-DC power supply module, converts the AC signal into a DC signal (shown as DC). The PWM chopper control module 02 includes a PWM drive switch, which chops the DC signal and outputs it to the lamp body 05, thus powering the lamp body 05. In this lamp brightness adjustment method, the AC signal is first converted into a stable DC signal, and then the DC signal is used to drive the switch via a pulse width modulation (PWM) signal to adjust the input voltage of the lamp body 05. However, the AC-DC conversion module 01 is relatively large, resulting in inconvenient installation, high cost, and low conversion efficiency.

[0051] To address at least one of the aforementioned problems, this disclosure proposes a low-cost, compact, and highly efficient method for adjusting the brightness of luminaires connected to a constant voltage source. This brightness adjustment method is implemented based on the structure of the luminaire. Specifically, in the luminaire provided by this disclosure, an electrical conversion voltage regulation module is incorporated to combine high-frequency chopping with direct AC power processing for brightness adjustment. The input voltage of the luminaire body is adjusted by controlling the chopping frequency, thereby regulating the luminaire's brightness. Therefore, since a high-cost AC / DC conversion module is not required, the overall cost and size of the luminaire are reduced. Simultaneously, the AC / DC conversion process is avoided, preventing AD conversion losses and improving the efficiency of electrical signal utilization. Furthermore, the elimination of phase-cutting circuits avoids grid pollution caused by phase-cutting processes in related technologies, and the absence of altered signal waveform properties also contributes to improved power factor.

[0052] It is understood that the lamps provided in the embodiments of this disclosure may be standalone lamps or lamps integrated with other functional devices; for example, the lamp may be a light strip or rigid light bar, such as a light box, light board or decorative light strip, etc.; or, the lamp may be a structural device with lighting function integrated into a household appliance such as a bathroom heater, which is not limited here.

[0053] Meanwhile, it can be understood that the lamp provided by the embodiment of the present disclosure is used in a constant voltage source, and the lamp body can be a light emitting diode (LED). A resistor or other elements are connected in front of or behind the LED to limit the current of the light emitting diode, instead of a constant current source for driving.

[0054] The lamp and the household appliance provided by the embodiment of the present disclosure will be described below. Figures 3-12 The lamp and the household appliance provided by the embodiment of the present disclosure will be described below.

[0055] The lamp and the household appliance provided by the embodiment of the present disclosure will be described below. Figure 3 The structure diagram of the lamp provided by the embodiment of the present disclosure is shown in the figure. Figure 4 The comparison diagram of the wave envelope before and after chopping of the lamp provided by the embodiment of the present disclosure is shown in the figure. Figure 3 And Figure 4 The lamp 10 is connected to a constant voltage source 20, and the constant voltage source 20 can provide an alternating current signal. The lamp 10 is provided with a brightness adjusting circuit 11, and the brightness adjusting circuit 11 can adjust the brightness of the lamp 10 based on the processing of the alternating current signal.

[0056] The brightness adjusting circuit 11 includes an electrical conversion voltage regulating module 111. The electrical conversion voltage regulating module 111 is used to chop the input first electrical signal at a preset frequency, and output the chopped second electrical signal to the lamp body 100. The intensity of the second electrical signal corresponding to the wave envelope line changing with time is consistent with the intensity of the first electrical signal corresponding to the wave envelope line changing with time, and the preset frequency is greater than twice the frequency of the first signal. See Figure 4 .

[0057] The electrical conversion voltage regulating module 111 can chop the input first electrical signal at a preset frequency to obtain the second electrical signal, and supply power to the lamp body 100 based on the second electrical signal. It can be understood that when the lamp body 100 is powered by direct current, the lamp can also include a rectifier module, which will be described below.

[0058] The lamp and the household appliance provided by the embodiment of the present disclosure will be described below. Figure 4, L1 represents a second electrical signal formed after the chopping, and L2 represents an equivalent voltage of the second electrical signal. The envelope line of the second electrical signal L1 corresponds to the envelope line of the first electrical signal before the chopping. For example, the envelope line of the first electrical signal can be a continuous wave with the same amplitude and frequency as L1. The equivalent voltage L2 of the second electrical signal L1 output by the electrical conversion voltage regulation module 111 depends on the duty cycle of the chopping, which is the ratio of the output time to the signal period time. The greater the duty cycle, the greater the equivalent voltage. When the duty cycle is 1, the entire signal period is output, and the equivalent voltage output is approximately equal to the input voltage corresponding to the first electrical signal. Thus, the brightness of the lamp can be adjusted by controlling the duty cycle.

[0059] Thus, in the lamp provided by the embodiments of the present disclosure, the electrical conversion voltage regulation module 111 is used to realize high-frequency chopping without changing the waveform properties and the waveform frequency of the alternating current, thereby facilitating the improvement of the power factor, the reduction of harmonic pollution to the power grid, and the improvement of pollution to the power environment.

[0060] In the lamp provided by the embodiments of the present disclosure, the size of the preset frequency is controlled to control the chopping frequency, thereby realizing the regulation of the duty cycle of the electrical signal, the regulation of the size of the second electrical signal, the regulation of the input voltage of the lamp body, and the regulation of the brightness of the lamp.

[0061] For example, the preset frequency can be 3 times, 4 times, or more times of the frequency of the first signal, which can be set based on the demand of the lamp and the brightness adjustment of the lamp, and is not limited herein.

[0062] It can be understood that in the embodiments of the present disclosure, the preset frequency is set to be greater than twice the frequency of the first signal, so that the brightness adjustment principle of the lamp can be distinguished from the brightness adjustment principle based on phase chopping in essence.

[0063] In the lamp provided by the embodiments of the present disclosure, the combination of high-frequency chopping and direct processing of alternating current is applied to the brightness adjustment of the lamp, which avoids the high-cost and large-volume AC-DC conversion module and the loss caused by electromagnetic conversion, thereby facilitating the realization of low cost, small size, and high conversion efficiency, and avoiding the power grid pollution caused by traditional phase cutting, achieving high power factor, and improving pollution to the power environment.

[0064] In some embodiments, the brightness adjustment circuit in the lamp further comprises a rectification module to realize direct current driving of the lamp body.

[0065] For example, Figure 5 FIG. 2 is a structural schematic diagram of another lamp provided by the embodiments of the present disclosure, Figure 6 FIG. 2 is a structural schematic diagram of another lamp provided by the embodiments of the present disclosure,Figure 7 This is a schematic diagram of the structure of another lamp provided in an embodiment of the present disclosure. Figure 8 This is a structural schematic diagram of another lamp provided in an embodiment of this disclosure. Figure 3 Based on, refer to Figures 5-8 In this lamp, the brightness adjustment circuit 11 also includes a rectifier module 112; the rectifier module 112 is integrated into the voltage regulation module 111 (e.g., Figure 5 or Figure 6 (as shown); or, the rectifier module 112 can be configured as a separate module device (such as...). Figure 7 or Figure 8 (as shown), and electrically connected to the voltage conversion and regulation module 111; wherein, as shown Figure 8 As shown, the rectifier module 112 is connected to the input terminal of the voltage conversion and regulation module 111, and is used to rectify and form a first electrical signal; or, as shown... Figure 7 As shown, the rectifier module 112 is located at the output end of the voltage conversion and regulation module 111 and is used to rectify the second electrical signal.

[0066] In the lamp provided in this embodiment, the brightness adjustment circuit 11 includes an AC-to-DC voltage regulation module 111 and a rectifier module 112. The AC-to-DC voltage regulation module 111, also known as an AC-to-DC voltage regulation module, receives AC power from a constant voltage source as its first input signal. This module performs high-frequency chopping on the input AC power, reducing the equivalent voltage and facilitating adjustment of the lamp body's input voltage. The rectifier module 112 performs post-rectification to provide DC drive for the lamp body 100.

[0067] For example, the rectifier module 112 may be integrated into the voltage regulator module 111; see reference Figure 5 Rectification can be performed before voltage regulation via electrical conversion; or refer to... Figure 6 Rectification can also occur after voltage regulation via electrical conversion; this is not a limitation. This arrangement reduces the number of individual components in the luminaire, thereby improving its overall stability and extending its lifespan.

[0068] For example, the rectifier module 12 can also be a separate module device; see reference Figure 7 The rectifier module 112 can be connected after the voltage conversion and regulation module 111, that is, the rectifier module 112 is connected between the voltage conversion and regulation module 111 and the lamp body 100; or refer to Figure 8 The rectifier module 112 can be connected before the voltage conversion and regulation module 111, that is, the voltage conversion and regulation module 111 is connected between the rectifier module 112 and the lamp body 100. This arrangement facilitates subsequent inspection and maintenance of different functional components and reduces the difficulty of inspection and maintenance.

[0069] Exemplarily, referring to Figure 6 or Figure 7 The first electric signal to which the input end of the electric conversion voltage regulation module 111 is connected can be single-phase alternating current, which can be 220V / 50Hz alternating current, for example. The second electric signal output by the output end of the electric conversion voltage regulation module 111 is high-frequency chopped alternating current. The waveform frequency of the second electric signal is the same as that of the first electric signal, that is, the overall envelope conversion frequency of the high-frequency chopped waveform is the same as that of the original alternating current. The chopping frequency is greater than the frequency of the alternating current. The equivalent voltage of the second electric signal obtained after high-frequency chopping is lower than that of the first electric signal, thereby realizing voltage regulation, specifically, voltage reduction, and further realizing lamp brightness adjustment.

[0070] Meanwhile, the rectifier module 112 is arranged between the lamp body 100 and the electric conversion voltage regulation module 111. The rectifier module 112 can rectify the second electric signal output by the electric conversion voltage regulation module 111, and the direct current signal obtained after rectification is used for input of the lamp body 100.

[0071] Alternatively, exemplarily, referring to Figure 5 or Figure 8 The input end of the rectifier module 112 is connected to single-phase alternating current. The rectifier module 112 inversely rectifies the negative half cycle signal of the single-phase alternating current to obtain a direct current signal with variable amplitude and outputs the direct current signal to the electric conversion voltage regulation module 111. The direct current signal with variable amplitude is the first electric signal input to the electric conversion voltage regulation module 111. The electric conversion voltage regulation module 111 performs high-frequency chopping on the direct current signal with variable amplitude to obtain the second electric signal. As shown in Figure 8 The overall envelope conversion frequency of the waveform of the second electric signal is the same as that of the first electric signal, and the chopping frequency is greater than the frequency of the first electric signal. The equivalent voltage of the second electric signal obtained after high-frequency chopping is lower than that of the first electric signal, thereby realizing voltage regulation, specifically, voltage reduction, and further realizing lamp brightness adjustment.

[0072] Exemplarily, in the above embodiments, the equivalent voltage of the first electric signal can be 24V, corresponding to relatively bright brightness of the lamp body 100. The equivalent voltage of the second electric signal can be 23.5V, corresponding to relatively dark brightness of the lamp body 100. This is only exemplarily described. In other embodiments, the brightness of the lamp body 100 can be flexibly set based on the needs of the lamp, which is not described in detail and is not limited.

[0073] The lamp provided by the embodiment of the present disclosure can realize the brightness adjustment of the lamp body 100 driven by direct current through the brightness adjustment circuit 11 including the electric conversion voltage regulation module 111 and the rectifier module 112. Meanwhile, the rectifier module 112 can be integrally arranged in the electric conversion voltage regulation module 111 or connected before or after the electric conversion voltage regulation module 111, and the arrangement mode is flexible and changeable, and can be flexibly adjusted based on the requirements of the lamp to meet the requirements of various lamps.

[0074] It should be noted that the lamp body 100 in the embodiment of the present disclosure is driven by direct current, and therefore the rectifier module 112 is needed to convert alternating current into direct current to drive the lamp body 100 by direct current. Exemplarily, the lamp body 100 in the embodiment of the present disclosure can be an LED or other direct current driven light emitting structure, which is not limited here.

[0075] In other embodiments, when the lamp body 100 is driven by alternating current, the rectifier module can not be arranged in the brightness adjustment circuit 11, that is, the electric conversion voltage regulation module 111 can directly use the alternating current after high-frequency chopping to supply power to the lamp body 100, which is not limited here.

[0076] In some embodiments, Figure 9 A structure diagram of another lamp provided by the embodiment of the present disclosure is shown in FIG. 10. Figure 7 Based on the structure shown in FIG. 10, the rectifier module 112 is integrally arranged with the lamp body 100. Figure 9 In the structure in which the rectifier module 112 is arranged at the output end of the electric conversion voltage regulation module 111, the rectifier module 112 is integrally arranged with the lamp body 100.

[0077] In the lamp provided by the embodiment of the present disclosure, when the rectifier module 112 is arranged after the electric conversion voltage regulation module 111, the rectifier module 112 can also be integrally arranged with the lamp body 100, thereby reducing the number of independent structures in the lamp, improving the overall stability of the lamp, and prolonging the service life of the lamp.

[0078] In some embodiments, Figure 10 A structure diagram of another lamp provided by the embodiment of the present disclosure is shown in FIG. 10. Figure 3 and Figure 7 Based on the structure shown in FIG. 10, the rectifier module 112 is integrally arranged with the lamp body 100. Figure 10 The lamp 10 further includes a filter circuit 113 connected between the brightness adjustment circuit 11 and the lamp body 100, and the filter circuit 113 is used to stabilize the input voltage of the lamp body 100.

[0079] Wherein, the signal output by the brightness adjusting circuit 11 can have a transiently excessive or a transiently insufficient signal, which can cause a larger voltage fluctuation and a poor stability. In view of this, the lamp 10 in the embodiment of the present disclosure further includes a filter circuit 113, which can filter out the above-mentioned transient abnormal signal, so that the voltage transmitted to the input end of the lamp body 100 has a smaller fluctuation, thereby having a better stability, which is conducive to the stable operation of the lamp body 100, delays the performance degradation, and prolongs the service life.

[0080] In the above-mentioned embodiments, the rectifier module 112 and the filter circuit 113 can adopt any circuit structure having corresponding functions known to those skilled in the art, which will not be described or limited here.

[0081] The following will be described in combination with Figure 11 The detailed structure of the electric conversion voltage regulating module 111 in the lamp provided by the embodiment of the present disclosure will be exemplarily described.

[0082] In some embodiments, Figure 11 In the lamp provided by the embodiment of the present disclosure, a structure schematic diagram of an electric conversion voltage regulating module is shown in FIG. 1. In Figure 3 、 Figures 5-10 Any of the diagrams, referring to Figure 11 The electric conversion voltage regulating module 111 in the brightness adjusting circuit 11 of the lamp 10 includes a first power switch 31, a second power switch 32, a third power switch 33, and a fourth power switch 34; the input end of the first power switch 31 and the input end of the third power switch 33 are respectively connected to two input ends of the electric conversion voltage regulating module 111 in one-to-one correspondence; the output end of the first power switch 31 is connected to the input end of the second power switch 32, and is connected to an output end of the electric conversion voltage regulating module 111; the output end of the third power switch 33 is connected to the input end of the fourth power switch 34, and is connected to another output end of the electric conversion voltage regulating module 111; the output end of the second power switch 32 is connected to the output end of the fourth power switch; the control end of the first power switch 31 inputs a first control signal S1, the control end of the second switch inputs a second control signal S2, the control end of the third power switch 33 inputs a third control signal S3, and the control end of the fourth power switch 34 inputs a fourth control signal S4; the first control signal S1, the second control signal S2, the third control signal S3, and the fourth control signal S4 are used for time sequence control through on-off, so that the electric conversion voltage regulating module 111 converts the first electric signal into the second electric signal.

[0083] Wherein, Figure 11An implementation circuit of the electrical conversion voltage regulating module 111 is shown. Among them, the first power switch 31, the second power switch 32, the third power switch 33 and the fourth power switch 34 are main power switches in the electrical conversion voltage regulating module 111, and the above four power switches constitute a bridge circuit in the electrical conversion voltage regulating module 111. Exemplarily, Figure 11 The power switches are exemplified by N-channel field effect transistors in the foregoing description, and are respectively denoted as Q1, Q2, Q3 and Q4 in the drawings; wherein the input end of each power switch is a drain, the output end is a source, and the control end is a gate. Specifically, the drain of Q1 and the drain of Q3 are respectively connected to the input end of the electrical conversion voltage regulating module 111, i.e., are used as voltage regulating inputs, and are usually connected to the L / N line of an alternating current input; in addition, if the input voltage is a voltage signal processed by a rectification module, the drain of Q1 and the drain of Q3 are respectively connected to the positive and negative poles of a direct current voltage; the source of Q1 and the drain of Q2 are connected to form a connected point; the source of Q3 and the drain of Q4 are connected to form another connected point; the two connected points are connected to the output end of the electrical conversion voltage regulating module 111, i.e., are used as voltage regulating outputs. Q1, Q2, Q3 and Q4 are respectively controlled by corresponding control signals S1, S2, S3 and S4 to realize the adjustment of the voltage signal at the output end of the electrical conversion voltage regulating module 111. Figure 11 In some embodiments, the power switches include at least one of N-channel field effect transistors (as shown in the foregoing description), P-channel field effect transistors, Insulate-Gate Bipolar Transistors (IGBTs) and triodes; the power switches in this paragraph include the first power switch 31, the second power switch 32, the third power switch 33 and the fourth power switch 34.

[0084] Figure 11 In the embodiments of the present disclosure, various different types of power switches all include an input end, an output end and a control end, and the bridge circuit composed of the four power switches is controlled based on the control signal connected to the control end, so as to realize the adjustment of the voltage signal at the output end, and further realize the adjustment of the input voltage of the lamp body, and realize the brightness adjustment of the lamp.

[0085] In some embodiments, the types of the first power switch 31, the second power switch 32, the third power switch 33 and the fourth power switch 34 are all the same.

[0086] In this way, the performance parameters of the four power switches are easy to be unified, so as to facilitate the control; and meanwhile, the circuit design difficulty is facilitated to be simplified.

[0087]

[0088] ​​Exemplarily, the four power switches are all N-channel field effect transistors, or are all P-channel field effect transistors, or are all IGBTs, or are all triodes, which can be set based on the demand of the lamp, and are not limited herein.

[0089] In some embodiments, continuing to refer to Figure 11 , the electric conversion voltage regulating module 111 further comprises an input detection sub-module 35, an output feedback detection sub-module 36, a dimming control signal sub-module 37, and a signal processing sub-module 38.

[0090] The input detection sub-module 35 is connected to the input end of the electric conversion voltage regulating module 111, can detect the first electric signal, and transmit the detection signal corresponding to the first electric signal to the signal processing sub-module 38, so as to realize high-frequency chopping by the signal processing sub-module 38.

[0091] The output feedback detection sub-module 36 is connected to the output end of the electric conversion voltage regulating module 111, can detect the second electric signal, and transmit the detection signal corresponding to the second electric signal to the signal processing sub-module 38, so as to realize high-frequency chopping by the signal processing sub-module 38.

[0092] The dimming control signal sub-module 37 is connected to the signal processing sub-module 38, can transmit the dimming control signal to the signal processing sub-module 38, so as to realize high-frequency chopping by the signal processing sub-module 38, and further realize dimming control.

[0093] The input end of the signal processing sub-module 38 is connected to the input detection sub-module 35, the output feedback detection sub-module 36, and the dimming control signal sub-module 37, and the output end of the signal processing sub-module 38 is connected to the first power switch 31, the second power switch 32, the third power switch 33, and the fourth power switch 34; the signal processing sub-module 38 is configured to output the first control signal S1, the second control signal S2, the third control signal S3, and the fourth control signal S4 based on the detection signal corresponding to the first electric signal, the detection signal corresponding to the second electric signal, and the dimming control signal.

[0094] Specifically, the first control signal S1, the second control signal S2, the third control signal S3, and the fourth control signal S4 in the electric conversion voltage regulating module 111 are output by the signal processing sub-module 38, and the input signals of the signal processing sub-module 38 are the detection signal of the input voltage (i.e., the detection signal corresponding to the first electric signal), the detection signal of the output voltage (i.e., the detection signal corresponding to the second electric signal), and the dimming control signal.

[0095] In some embodiments, the dimming control signal comprises a digital pulse width modulation signal.

[0096] In the embodiments of the present disclosure, the digital pulse width modulation signal is used in combination with the detection signal of the input voltage and the detection signal of the output voltage to realize high-frequency chopping of the alternating current.

[0097] In other embodiments, the dimming control signal can also be other types of modulation signals, which are not described or limited here.

[0098] The lamp provided in the embodiments of the present disclosure is a lamp connected to a constant voltage source, which adjusts the input voltage of the lamp body to adjust the brightness of the lamp. Specifically, the lamp includes a brightness adjustment circuit, which includes an electrical conversion voltage regulation module. The electrical conversion voltage regulation module can realize high-frequency chopping of the input first electrical signal and keep the waveform transformation frequency of the second electrical signal generated by chopping the same as the waveform change frequency of the first electrical signal. Therefore, the high-frequency chopping processing in the electrical conversion voltage regulation module does not change the waveform properties, which is beneficial to improve the power factor and reduce harmonic pollution to the power grid when similar leading or trailing edge chopping is applied while adjusting the input voltage of the lamp body to adjust the brightness of the lamp.

[0099] In addition, the equivalent voltage corresponding to the second electrical signal is adjusted by the duty cycle control of the high-frequency chopping signal (i.e., the dimming control signal) without changing the waveform properties, and the voltage is used as the input voltage of the lamp body. The lamp body reduces its own brightness with the decrease of the equivalent voltage, realizing brightness adjustment.

[0100] At the same time, the electrical conversion voltage regulation module does not change the properties of the input first electrical signal. When the input first electrical signal is alternating current, the output is also alternating current. When the input first electrical signal is direct current, the output is also direct current. Such a setting reduces the use of electromagnetic converters, such as AC-DC conversion modules, and reduces the overall cost of the lamp.

[0101] In addition, since the lamp does not need to be provided with a high-cost and large-volume AC-DC conversion module, conversion loss is avoided, which is beneficial to improve conversion efficiency, reduce the overall size of the lamp, and reduce its cost.

[0102] Further, in some lamps, a filter circuit can be provided in front of the lamp body with adjusted brightness to reduce the fluctuation of the input voltage of the lamp body by using the filter circuit and improve stability.

[0103] On the basis of the above-mentioned embodiments, the present disclosure also provides a household appliance, which can include any of the lamps provided in the above-mentioned embodiments and has corresponding technical effects, which are described in detail above and will not be described here.

[0104] Exemplarily, Figure 12A structural schematic diagram of a household appliance is provided for the embodiments of the present disclosure. Referring to Figure 12 The household appliance can include a lamp 10, which can adopt the structure of any one of the lamps in the above embodiments.

[0105] Exemplarily, the household appliance can be a multifunctional bath heater.

[0106] In other embodiments, the household appliance can also be other household appliances with lighting function, which are not limited herein.

[0107] In other embodiments, the household appliance can also include other structural components, which are not limited herein.

[0108] It should be noted that, in this document, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element preceded by "comprises... " does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0109] The above description is merely that of specific embodiments of the present disclosure, to enable a person skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is not to be limited to the embodiments described herein, but is to accord with the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A luminaire characterized by, The lamp is connected to a constant voltage source, and the lamp is provided with a brightness adjusting circuit; the brightness adjusting circuit comprises an electric conversion voltage regulating module; The electric conversion voltage regulating module is used for chopping an input first electric signal at a preset frequency and outputting a second electric signal after chopping to a lamp body; The envelope line of the intensity of the second electric signal changing with time is consistent with the envelope line of the intensity of the first electric signal changing with time, and the preset frequency is greater than 2 times the frequency of the first electric signal; The electric conversion voltage regulating module comprises a first power switch, a second power switch, a third power switch, a fourth power switch, an input detection sub-module, an output feedback detection sub-module, a dimming control signal sub-module and a signal processing sub-module; The input detection sub-module is connected to the input end of the electric conversion voltage regulating module, the output feedback detection sub-module is connected to the output end of the electric conversion voltage regulating module, the input end of the signal processing sub-module is connected to the input detection sub-module, the output feedback detection sub-module and the dimming control signal sub-module, and the output end of the signal processing sub-module is connected to the first power switch, the second power switch, the third power switch and the fourth power switch; the control end of the first power switch inputs a first control signal, the control end of the second power switch inputs a second control signal, the control end of the third power switch inputs a third control signal, and the control end of the fourth power switch inputs a fourth control signal; The input detection sub-module is used for detecting the first electric signal and transmitting a detection signal corresponding to the first electric signal to the signal processing sub-module; The output feedback detection sub-module is used for detecting the second electric signal and transmitting a detection signal corresponding to the second electric signal to the signal processing sub-module; The dimming control signal sub-module is used for transmitting a dimming control signal to the signal processing sub-module; The signal processing sub-module is used for outputting the first control signal, the second control signal, the third control signal and the fourth control signal based on the detection signal corresponding to the first electric signal, the detection signal corresponding to the second electric signal and the dimming control signal; the first control signal, the second control signal, the third control signal and the fourth control signal are used for controlling the electric conversion voltage regulating module to convert the first electric signal into the second electric signal through the timing control of on-off.

2. The luminaire of claim 1, wherein, The brightness adjusting circuit further comprises a rectifier module; The rectifier module is integrally arranged in the electric conversion voltage regulating module; or the rectifier module is arranged as an independent module device and is electrically connected with the electric conversion voltage regulating module; The rectifier module is arranged at the input end of the electric conversion voltage regulating module and is used for rectifying to form the first electric signal; or the rectifier module is arranged at the output end of the electric conversion voltage regulating module and is used for rectifying the second electric signal.

3. The luminaire of claim 2, wherein, In the structure that the rectifier module is arranged at the output end of the electric conversion voltage regulating module, the rectifier module is integrally arranged with the lamp body.

4. The luminaire of claim 2, wherein, The filter circuit is connected between the brightness adjusting circuit and the lamp body. The filter circuit is used for stabilizing the input voltage of the lamp body.

5. The luminaire of any of claims 1-4, wherein, The input of the first power switch and the input of the third power switch are respectively connected with two inputs of the electric conversion voltage regulating module; the output of the first power switch is connected with the input of the second power switch and connected to an output of the electric conversion voltage regulating module; the output of the third power switch is connected with the input of the fourth power switch and connected to another output of the electric conversion voltage regulating module; the output of the second power switch is connected with the output of the fourth power switch.

6. The luminaire of claim 5, wherein, The power switch comprises at least one of N-channel field effect transistor, P-channel field effect transistor, insulated gate bipolar transistor and triode. The power switch comprises the first power switch, the second power switch, the third power switch and the fourth power switch.

7. The luminaire of claim 6, wherein, The first power switch, the second power switch, the third power switch and the fourth power switch are of the same type.

8. The light fixture of claim 1, wherein, The dimming control signal comprises a digital pulse width modulation signal.

9. A domestic appliance characterized in that, The lamp comprises the lamp according to any one of claims 1-8.

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