Dimmer circuit and dimmer

Abstract

A dimmer circuit and a dimmer, belonging to the technical field of electronic circuits. A wireless communication circuit converts a wireless communication signal into a first wired communication signal. A resistor assembly comprises a plurality of adjustment resistors connected in series, a first end of a first adjustment resistor serving as an adjustment end of the dimmer circuit. A microprocessor is provided with a port group used for adjusting the resistance value of the resistor assembly, and configures, on the basis of the first wired communication signal, at least one port in the port group to have a first level, so as to connect a second end of at least one adjustment resistor to a power ground. Therefore, the present application can ground the second end of at least one adjustment resistor by means of wireless communication, so as to adjust the resistance of the resistor assembly, such that mounting dimmer switches does not need to match human heights, and dimmer switches together with lighting fixtures can be arranged on the ceiling, or on mounting frames of venues, or in mounting slots of street lamps, or in other application scenarios, thus simplifying wiring and mounting of dimmer circuits.

Description

Dimming circuit and dimmer Technical Field

[0001] The present application belongs to the technical field of electronic circuits, and in particular relates to a dimming circuit and a dimmer. Background Art

[0002] In the traditional lighting market in Europe and the United States, especially in North America, many LED lamps have built-in 0 to 10V dimming functions. The specific application method is usually to connect the lamps through a dimmer switch to achieve the turning on and off and dimming functions.

[0003] The dimmer switch has a built-in adjustable resistor (such as a 120K resistor or other resistance value resistor). By manually adjusting the resistor, the voltage difference between the two control pins (D+, D-) of the lamp can be changed. The maximum adjustable value is 10V and the minimum adjustable value is 0V to control the brightness of the lamp.

[0004] Since the adjustment resistor needs to be manually adjusted, the setting of the dimmer switch needs to match the height of the human body. The lamps are usually located on the ceiling, or installed on the mounting rack of the venue, in the installation groove of the street lamp, and other application scenarios. As a result, the wiring of the dimming circuit is complicated and too long, and the installation is cumbersome.

[0005] Therefore, the wiring of the related dimming circuit is complicated and too long, and the installation is cumbersome.

[0006] Application Contents

[0007] The purpose of the present application is to provide a dimming circuit and a dimmer, aiming to solve the problems of complex and long wiring and cumbersome installation of related dimming circuits. Technical Solutions

[0008] An embodiment of the present application provides a dimming circuit, comprising:

[0009] a wireless communication circuit configured to receive a wireless communication signal from a wireless link and convert the wireless communication signal into a first wired communication signal;

[0010] a resistor component comprising a plurality of regulating resistors connected in series, wherein a first end of a first regulating resistor serves as a regulating end of the dimming circuit;

[0011] A microprocessor is connected to the wireless communication circuit and the resistor component, has a port group for adjusting the resistance value of the resistor component, and is configured to set at least one port in the port group to a first level according to the first wired communication signal so that the second end of at least one of the adjustment resistors is connected to the power ground.

[0012] In one embodiment, each port in the port group is connected to the second end of each regulating resistor in a one-to-one correspondence.

[0013] In one embodiment, a switch assembly is further included;

[0014] The switch assembly includes a plurality of switch modules;

[0015] The plurality of switch modules are connected to the second ends of the plurality of adjustment resistors in a one-to-one correspondence, and are also connected to the second ends of the plurality of adjustment resistors in a one-to-one correspondence;

[0016] The switch module is configured to connect the second end of the corresponding regulating resistor to a power ground in response to a signal of a first level output by a port in the port group.

[0017] In one embodiment, the microprocessor is further configured to output a control signal according to the first wired communication signal; and the dimming circuit further comprises:

[0018] The switch circuit is connected to the microprocessor and configured to receive input AC power and transmit the input AC power according to the control signal.

[0019] In one embodiment, the dimming circuit further includes:

[0020] a conversion and isolation circuit configured to receive input alternating current (AC) and isolate and convert the input AC to output AC;

[0021] a zero-crossing detection circuit configured to output a detection signal in response to the output AC power crossing a zero point;

[0022] The microprocessor is further configured to output a control signal according to the first wired communication signal and the detection signal.

[0023] In one embodiment, the zero-crossing detection circuit includes a photocoupler, a first resistor and a second resistor;

[0024] The negative electrode of the photoelectric coupler and the first end of the first resistor serve together as the output AC input end of the zero-crossing detection circuit, and are connected to the conversion isolation circuit to receive the output AC power; the positive electrode of the photoelectric coupler is connected to the second end of the first resistor, and the collector of the photoelectric coupler and the first end of the second resistor serve together as the inspection signal output end of the zero-crossing detection circuit, and are connected to the microprocessor to output the detection signal; the emitter of the photoelectric coupler is connected to the power ground.

[0025] In one embodiment, the switch circuit includes a relay, a first transistor, a first diode, a third resistor, and a fourth resistor;

[0026] The first end of the third resistor and the first end of the fourth resistor serve together as a control signal input end of the switching circuit and are connected to the microprocessor to receive the control signal; the second end of the fourth resistor is connected to the base of the first transistor, the collector of the first transistor is connected to the first control end of the relay and the positive electrode of the first diode, the second control end of the relay and the negative electrode of the first diode serve together as a first DC input end of the switching circuit to receive the first DC power; the common end of the relay serves as an AC input output end of the switching circuit to output the input AC power; the normally open end of the relay serves as an AC input end of the switching circuit and is connected to the conversion isolation circuit to receive the input AC power; the emitter of the first transistor and the second end of the third resistor are commonly connected to the power ground.

[0027] In one embodiment, it further includes:

[0028] a rectifier circuit, connected to the conversion isolation circuit, configured to rectify the output alternating current to output a first direct current to power the switching circuit;

[0029] A voltage stabilizing circuit is connected to the rectifier circuit and is configured to stabilize the first direct current to power the wireless communication circuit and the microprocessor.

[0030] In one embodiment, the wireless communication signal and the first wired communication signal both carry a dimming flag, and the microprocessor is specifically configured to set the port corresponding to the dimming flag to a first level.

[0031] In one embodiment, the wireless communication signal and the first wired communication signal both carry continuous dimming instructions, and the microprocessor is specifically configured to cyclically set each port in the port group to the first level in sequence according to the continuous dimming instruction, so as to cyclically connect the second end of each adjustment resistor to the power ground in sequence.

[0032] In one embodiment, the wireless communication signal and the first wired communication signal both carry a termination dimming instruction, and the microprocessor is specifically configured to stop sequentially setting the ports in the port group to the first level in a loop according to the termination dimming instruction, and maintain the current setting of the first level port.

[0033] In one embodiment, the port group includes a first general-purpose input / output terminal of the microprocessor, a second general-purpose input / output terminal of the microprocessor, a third general-purpose input / output terminal of the microprocessor, a fourth general-purpose input / output terminal of the microprocessor, a fifth general-purpose input / output terminal of the microprocessor, a sixth general-purpose input / output terminal of the microprocessor, a seventh general-purpose input / output terminal of the microprocessor, an eighth general-purpose input / output terminal of the microprocessor, a ninth general-purpose input / output terminal of the microprocessor, a tenth general-purpose input / output terminal of the microprocessor, and an eleventh general-purpose input / output terminal of the microprocessor; a power supply terminal of the microprocessor is connected to a stabilized first direct current; a twelfth general-purpose input / output terminal of the microprocessor is connected to a first wired communication signal; a thirteenth general-purpose input / output terminal of the microprocessor outputs a control signal; a fourteenth general-purpose input / output terminal of the microprocessor is connected to a detection signal; and a ground terminal of the microprocessor is connected to a power ground.

[0034] In one embodiment, the wireless communication circuit includes a wireless receiving chip, a first inductor, a second inductor, a first capacitor, a second capacitor, and an antenna;

[0035] The power supply terminal of the wireless receiving chip serves as the first DC input terminal of the wireless communication circuit to receive the stabilized first DC power; the data output terminal of the wireless receiving chip serves as the first wired communication signal output terminal of the wireless communication circuit and is connected to the microprocessor to output the first wired communication signal; the RF input terminal of the wireless receiving chip is connected to the first end of the first inductor and the first end of the first capacitor, the second end of the first inductor is connected to the first end of the second capacitor, the second end of the second inductor and the antenna, and the ground terminal of the wireless receiving chip is connected to the power ground.

[0036] An embodiment of the present application further provides a dimmer, which includes the above-mentioned dimming circuit. Beneficial effects

[0037] Compared with the prior art, the embodiments of the present application have the following beneficial effects: since the wireless communication circuit converts the wireless communication signal into a first wired communication signal; the resistance component includes a plurality of adjustment resistors connected in series, wherein the first end of the first adjustment resistor serves as the adjustment end of the dimming circuit; the microprocessor has a port group for adjusting the resistance value of the resistance component, and sets at least one port in the port group to the first level according to the first wired communication signal, so that the second end of at least one adjustment resistor is connected to the power ground; therefore, the second end of at least one adjustment resistor can be connected to the power ground through wireless communication, thereby adjusting the resistance of the resistance component, and the installation of the dimmer switch does not need to match the height of the human body, and can be set on the ceiling together with the lamp or on the mounting rack of the venue, in the mounting groove of the street lamp, and other application scenarios, saving the wiring of the dimming switch from the lamp to the ground, that is, simplifying the wiring and installation of the dimming circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical application in the embodiments of the present application, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0039] FIG1 is a schematic structural diagram of a dimming circuit provided in one embodiment of the present application;

[0040] FIG2 is another structural diagram of a dimming circuit provided in an embodiment of the present application;

[0041] FIG3 is another structural diagram of a dimming circuit provided in an embodiment of the present application;

[0042] FIG4 is another structural diagram of a dimming circuit provided in an embodiment of the present application;

[0043] FIG5 is another structural diagram of a dimming circuit provided in an embodiment of the present application;

[0044] FIG6 is a partial circuit schematic diagram of an exemplary dimming circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0046] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0047] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0049] FIG1 shows a schematic diagram of the structure of a dimming circuit provided in a preferred embodiment of the present application. For ease of explanation, only the parts related to the present embodiment are shown, which are described in detail as follows:

[0050] The dimming circuit includes a wireless communication circuit 01, a resistor component 02 and a microprocessor U1.

[0051] The wireless communication circuit 01 is configured to receive a wireless communication signal from a wireless link and convert the wireless communication signal into a first wired communication signal.

[0052] The resistor component 02 includes a plurality of regulating resistors Rs connected in series, wherein a first end of the first regulating resistor Rs serves as a regulating end of the dimming circuit.

[0053] The microprocessor U1 is connected to the wireless communication circuit 01 and the resistor component 02, and has a port group for adjusting the resistance value of the resistor Rs component 02, and is configured to set at least one port in the port group to a first level according to a first wired communication signal so that the second end of at least one adjustment resistor Rs is connected to the power ground.

[0054] It should be emphasized that the related dimming circuit also uses thyristors and performs dimming through chopping. This thyristor chopping dimming method has a poor power factor (PF) value and low efficiency. The present application reduces the possibility of a decrease in the PF value by adjusting the resistance value of the resistor component 02.

[0055] In a specific implementation, there are two situations for the above dimming circuit.

[0056] In the first case, as shown in FIG1 , each port in the port group is connected to the second end of each regulating resistor in a one-to-one correspondence.

[0057] It should be noted that this situation applies to microprocessors whose outputs are in a high-impedance state.

[0058] In the second case, as shown in FIG2 , the dimming circuit further includes a switch assembly 90 ; the switch assembly 90 includes a plurality of switch modules 91 ; the plurality of switch modules 91 are connected in a one-to-one correspondence to the second ends of the plurality of adjustment resistors Rs and in a one-to-one correspondence to the plurality of ports in the port group; the switch modules 91 are configured to connect the second ends of the corresponding adjustment resistors Rs to the power ground in response to a first level signal output by a port in the port group. It will be understood that the switch modules 91 include switching transistors, which include triodes, field-effect transistors, and insulated gate bipolar transistors.

[0059] It should be noted that this situation is applicable to microprocessors whose outputs do not have a high-impedance state.

[0060] It should be noted that, if both the wireless communication signal and the first wired communication signal carry a dimming flag, the microprocessor U1 is specifically configured to set the port corresponding to the dimming flag to the first level.

[0061] By sending a wireless communication signal carrying a dimming identifier from a wireless link and converting the wireless communication signal to obtain a first wired communication signal carrying the dimming identifier, the microprocessor U1 sets the port corresponding to the dimming identifier to the first level, thereby grounding the second end of the adjustment resistor Rs corresponding to the port set to a low level, adjusting the resistance value of the resistor component 02, and adjusting the lamp to the preset brightness.

[0062] It should be noted that both the wireless communication signal and the first wired communication signal carry continuous dimming instructions. The microprocessor U1 is specifically configured to set each port in the port group to the first level in a cycle according to the continuous dimming instruction, so as to set the second end of each adjustment resistor Rs to the first level in a cycle.

[0063] By sending a wireless communication signal carrying a continuous dimming instruction from a wireless link and converting the wireless communication signal into a first wired communication signal carrying the continuous dimming instruction, the microprocessor U1 sets each port in the port group to the first level in sequence according to the continuous dimming instruction, so as to connect the second end of each adjustment resistor Rs to the power ground in sequence, and cyclically adjust the resistance value of the resistance component 02, thereby cyclically increasing or decreasing the brightness of the lamp.

[0064] It should be noted that both the wireless communication signal and the first wired communication signal carry a termination dimming instruction. The microprocessor U1 is specifically configured to stop setting the ports in the port group to the first level in sequence according to the termination dimming instruction and maintain the current first level port settings.

[0065] After receiving the first wired communication signal carrying the continuous dimming instruction, the first wired communication signal carrying the termination dimming instruction is received again. At this time, the microprocessor U1 stops setting the ports in the port group to the first level in sequence according to the termination dimming instruction, and maintains the current setting of the first level port, that is, when the brightness of the lamp is cyclically increased or decreased, the current brightness of the lamp is maintained according to the termination dimming instruction.

[0066] As shown in FIG3 , the microprocessor U1 is further configured to output a control signal according to the first wired communication signal; the dimming circuit further includes a switch circuit 03 .

[0067] The switch circuit 03 is connected to the microprocessor U1 and is configured to receive the input AC power and transmit the input AC power according to the control signal.

[0068] The switch circuit 03 is used to switch the power supply to the lamp on and off, thereby turning the lamp on or off.

[0069] As shown in FIG4 , the dimming circuit further includes a conversion isolation circuit 04 and a zero-crossing detection circuit 05 .

[0070] The conversion and isolation circuit 04 is configured to receive input AC power, isolate and convert the input AC power to output output AC power;

[0071] The zero-crossing detection circuit 05 is configured to output a detection signal in response to the output AC power crossing a zero point;

[0072] The microprocessor U1 is further configured to output a control signal according to the first wired communication signal and the detection signal.

[0073] Zero-crossing detection circuit 05 responds to the zero-crossing point of the output AC power by outputting a detection signal, causing microprocessor U1 to output a control signal when the output AC power crosses zero. This enables the lighting fixture to be turned on and off when the input AC power crosses zero. This reduces the possibility of arcing and sparking in the relay within switch circuit 03 when turning the lighting fixture on or off, thereby improving the safety and reliability of the dimming circuit. Furthermore, although the input AC power is not grounded and the zero potential fluctuates between the neutral and live wires of the input AC power, the isolation provided by conversion isolation circuit 04 reduces the possibility of short circuits when the dimming circuit power supply is grounded, further improving the safety and reliability of the dimming circuit.

[0074] As shown in FIG5 , the dimming circuit further includes a rectifier circuit 06 and a voltage stabilizing circuit 07 .

[0075] The rectifier circuit 06 is connected to the conversion isolation circuit 04 and is configured to rectify the output alternating current to output a first direct current to power the switch circuit 03 .

[0076] The voltage stabilizing circuit 07 is connected to the rectifier circuit 06 and is configured to stabilize the first direct current to power the wireless communication circuit 01 and the microprocessor U1.

[0077] The power supply to each functional module is realized through the rectifier circuit 06 and the voltage stabilizing circuit 07.

[0078] FIG6 shows a partial exemplary circuit structure of a dimming circuit provided in an embodiment of the present application. For ease of illustration, only the portion related to the embodiment of the present application is shown, which is described in detail as follows:

[0079] The port group includes the first universal input and output terminal P0.5 of the microprocessor U1, the second universal input and output terminal P1.4 of the microprocessor U1, the third universal input and output terminal P3.0 of the microprocessor U1, the fourth universal input and output terminal P1.3 of the microprocessor U1, the fifth universal input and output terminal P1.2 of the microprocessor U1, the sixth universal input and output terminal P1.1 of the microprocessor U1, the seventh universal input and output terminal P1.0 of the microprocessor U1, the eighth universal input and output terminal P0.1 of the microprocessor U1, and the ninth universal input and output terminal P1. The universal input and output terminal P0.2, the tenth universal input and output terminal P0.3 of the microprocessor U1, and the eleventh universal input and output terminal P0.4 of the microprocessor U1; the power supply terminal of the microprocessor U1 is connected to the first regulated DC power; the twelfth universal input and output terminal P1.5 of the microprocessor U1 is connected to the first wired communication signal; the thirteenth universal input and output terminal P0.7 of the microprocessor U1 outputs a control signal; the fourteenth universal input and output terminal P2.0 of the microprocessor U1 is connected to the detection signal; the ground terminal of the microprocessor U1 is connected to the power ground.

[0080] The wireless communication circuit 01 includes a wireless receiving chip U2 , a first inductor L1 , a second inductor L2 , a first capacitor C1 , a second capacitor C2 , and an antenna ANT.

[0081] The power supply terminal VDD of the wireless receiving chip U2 serves as the first DC input terminal of the wireless communication circuit 01 to connect to the stabilized first DC power; the data output terminal DOUT of the wireless receiving chip U2 serves as the first wired communication signal output terminal of the wireless communication circuit 01, and is connected to the microprocessor U1 to output the first wired communication signal; the radio frequency input terminal RFIN of the wireless receiving chip U2 is connected to the first end of the first inductor L1 and the first end of the first capacitor C1, the second end of the first inductor L1 is connected to the first end of the second capacitor C2 and the second end of the second inductor L2 and the antenna ANT, and the ground terminal GND of the wireless receiving chip U2 is connected to the power ground.

[0082] It should be emphasized that the wireless communication circuit 01 can be implemented by various communication chips, such as a WIFI chip and a Bluetooth chip.

[0083] The zero-crossing detection circuit 05 includes a photocoupler U3 , a first resistor R1 , and a second resistor R2 .

[0084] The negative electrode of the photoelectric coupler U3 and the first end of the first resistor R1 serve together as the output AC input end of the zero-crossing detection circuit 05, and are connected to the conversion isolation circuit 04 to receive the output AC power; the positive electrode of the photoelectric coupler U3 is connected to the second end of the first resistor R1, and the collector of the photoelectric coupler U3 and the first end of the second resistor R2 serve together as the inspection signal output end of the zero-crossing detection circuit 05, and are connected to the microprocessor U1 to output the detection signal; the emitter of the photoelectric coupler U3 is connected to the power ground.

[0085] The zero-crossing detection circuit 05 is realized by the photoelectric coupler U3, and the circuit is simple and reliable.

[0086] The switch circuit 03 includes a relay K1 , a first transistor Q1 , a first diode D1 , a third resistor R3 , and a fourth resistor R4 .

[0087] The first end of the third resistor R3 and the first end of the fourth resistor R4 jointly serve as a control signal input terminal of the switch circuit 03 and are connected to the microprocessor U1 to receive the control signal. The second end of the fourth resistor R4 is connected to the base of the first transistor Q1. The collector of the first transistor Q1 is connected to the first control terminal of the relay K1 and the anode of the first diode D1. The second control terminal of the relay K1 and the cathode of the first diode D1 jointly serve as a first DC input terminal of the switch circuit 03 to receive the first DC power. The common terminal of the relay K1 serves as the input AC output terminal of the switch circuit 03 to output the input AC power. The normally open terminal of the relay K1 serves as the input AC input terminal of the switch circuit 03 and is connected to the conversion isolation circuit 04 to receive the input AC power. The emitter of the first transistor Q1 and the second end of the third resistor R3 are commonly connected to the power ground.

[0088] The conversion isolation circuit 04 includes a transformer T1; the first end of the primary side of the transformer T1 and the second end of the primary side of the transformer T1 serve together as the input AC input terminal of the conversion isolation circuit 04 to receive the input AC power; the first end of the secondary side of the transformer T1 and the second end of the negative side of the transformer T1 serve together as the output AC power output terminal of the conversion isolation circuit 04, which is connected to the rectifier circuit 06 to output the output AC power.

[0089] Rectifier circuit 06 includes a rectifier bridge DB1 and a third capacitor C3; the first AC terminal AC of rectifier bridge DB1 and the second AC terminal AC of rectifier bridge DB1 serve together as the output AC input terminal of rectifier circuit 06, connected to conversion isolation circuit 04 to receive the output AC power; the positive DC output terminal V+ of rectifier bridge DB1 and the first terminal of third capacitor C3 serve together as the first DC input terminal of rectifier circuit 06 to output the first DC power; the negative DC output terminal V- of rectifier bridge DB1 and the second terminal of third capacitor C3 are commonly connected to the power ground.

[0090] The voltage stabilizing circuit 07 includes a voltage stabilizer U4, a fourth capacitor C4, and a fifth capacitor C5; the input terminal IN of the voltage stabilizer U4 and the first end of the fourth capacitor C4 serve together as the first DC input terminal of the voltage stabilizing circuit 07, which is connected to the rectifier circuit 06 to receive the first DC power; the output terminal OUT of the voltage stabilizer U4 and the second end of the fourth capacitor C4 serve together as the stabilized first DC output terminal of the voltage stabilizing circuit 07, which is connected to the wireless communication circuit 01 and the microprocessor U1 to output the stabilized first DC power; the ground terminal GND of the voltage stabilizer U4, the second end of the fourth capacitor C4, and the second end of the fifth capacitor C5 are commonly connected to the power ground.

[0091] The following further explains what is shown in Figure 5 in combination with the working principle:

[0092] The first and second primary terminals of transformer T1 are connected to input AC power. Transformer T1 isolates and converts the input AC power to output AC power from the first and second secondary terminals of transformer T1. The output AC power is connected to the first and second AC terminals of rectifier bridge DB1. Rectifier bridge DB1 rectifies the output AC power to output a first DC power from the positive DC output terminal V+ of rectifier bridge DB1. The first DC power is connected to the input terminal IN of voltage regulator U4. Voltage regulator U4 stabilizes the first DC power to output the stabilized first DC power from the output terminal OUT of voltage regulator U4.

[0093] The antenna ANT receives a wireless communication signal from the wireless link and converts the wireless communication signal into a second wired communication signal. The second wired communication signal is filtered and impedance-matched by the first inductor L1, the second inductor L2, the first capacitor C1, and the second capacitor C2, and then input to the radio frequency input terminal RFIN of the wireless receiving chip U2. The wireless receiving chip U2 converts the second wired communication signal into a first wired communication signal and outputs it from the data output terminal DOUT of the wireless receiving chip U2 to the twelfth general input and output terminal P1.5 of the microprocessor U1.

[0094] When both the wireless communication signal and the first wired communication signal carry a dimming flag, the microprocessor U1 sets the port corresponding to the dimming flag to a first level (low level). For example, the microprocessor U1 sets the third general-purpose input / output terminal P3.0 to a low level, thereby setting the resistance of the resistor component O2 to 2 times the adjustment resistance Rs. Similarly, the resistance of the resistor component O2 can be set to 1 times the adjustment resistance Rs to 11 times the adjustment resistance Rs, thereby adjusting the lamp to a preset brightness.

[0095] Both the wireless communication signal and the first wired communication signal carry continuous dimming instructions. The microprocessor U1 sets each port in the port group to the first level (low level) in a cycle according to the continuous dimming instruction, so as to set the second end of each adjustment resistor Rs to a low level (connected to the power ground) in a cycle; thereby gradually dimming the brightness of the lamp.

[0096] When the brightness of the lamp is gradually dimmed in a cycle or gradually dimmed, if a first wired communication signal carrying a termination dimming instruction is received, the microprocessor U1 stops setting the ports in the port group to the first level (low level) in sequence according to the termination dimming instruction, and maintains the current setting of the first level (low level) port; for example, when the first wired communication signal carrying the termination dimming instruction is received, the current low-level port of the microprocessor U1 is the third general input and output terminal P3.0, then the microprocessor U1 stops setting the ports in the port group to a low level in sequence according to the termination dimming instruction, and maintains the setting of the current low-level port (the third general input and output terminal P3.0), and maintains the resistance of the resistor component 02 set to 2 times the adjustment resistance Rs.

[0097] The negative pole of the photoelectric coupler U3 and the positive pole of the photoelectric coupler U3 are connected to the output alternating current, and when the output alternating current passes through zero, a detection signal (jump signal) is output from the collector of the photoelectric coupler U3. If both the wired communication signal and the first wired communication signal carry an on-state instruction, the microprocessor U1 responds to the on-state instruction and outputs a control signal from the thirteenth general input and output terminal P0.7 to the base of the first transistor Q1 when receiving the detection signal, so that the first transistor Q1 is turned on, the first direct current flows into the coil of the relay K1, and the relay K1 is closed and transmits the input alternating current to the lamp.

[0098] An embodiment of the present application further provides a dimmer, which includes the above-mentioned dimming circuit.

[0099] In an embodiment of the present application, the wireless communication signal is converted into a first wired communication signal through a wireless communication circuit; the resistance component includes a plurality of adjustment resistors connected in series, wherein the first end of the first adjustment resistor serves as the adjustment end of the dimming circuit; the microprocessor has a port group for adjusting the resistance value of the resistance component, and sets at least one port in the port group to a low level according to the first wired communication signal; each port in the port group is connected one-to-one with the second end of each adjustment resistor; therefore, the second end of at least one adjustment resistor can be set to a low level through wireless communication, thereby adjusting the resistance of the resistance component, and the installation of the dimmer switch does not need to match the height of the human body, and can be set on the ceiling together with the lamp, thereby simplifying the wiring and installation of the dimming circuit.

[0100] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0101] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A dimming circuit, characterized in that: include: a wireless communication circuit configured to receive a wireless communication signal from a wireless link and convert the wireless communication signal into a first wired communication signal; a resistor component comprising a plurality of regulating resistors connected in series, wherein a first end of a first regulating resistor serves as a regulating end of the dimming circuit; A microprocessor is connected to the wireless communication circuit and the resistor component, has a port group for adjusting the resistance value of the resistor component, and is configured to set at least one port in the port group to a first level according to the first wired communication signal so that the second end of at least one of the adjustment resistors is connected to the power ground.

2. The dimming circuit according to claim 1, wherein: Each port in the port group is connected to the second end of each regulating resistor in a one-to-one correspondence.

3. The dimming circuit according to claim 1, wherein: Also included is a switch assembly; The switch assembly includes a plurality of switch modules; The plurality of switch modules are connected to the second ends of the plurality of adjustment resistors in a one-to-one correspondence, and are also connected to the plurality of ports in the port group in a one-to-one correspondence; The switch module is configured to connect the second end of the corresponding regulating resistor to a power ground in response to a signal of a first level output by a port in the port group.

4. The dimming circuit according to claim 1, wherein: The microprocessor is further configured to output a control signal according to the first wired communication signal; and the dimming circuit further includes: The switch circuit is connected to the microprocessor and configured to receive input AC power and transmit the input AC power according to the control signal.

5. The dimming circuit according to claim 4, wherein: The dimming circuit further includes: a conversion and isolation circuit configured to receive input alternating current (AC) and isolate and convert the input AC to output AC; a zero-crossing detection circuit configured to output a detection signal in response to the output AC power crossing a zero point; The microprocessor is further configured to output a control signal according to the first wired communication signal and the detection signal.

6. The dimming circuit according to claim 5, wherein: The zero-crossing detection circuit includes a photoelectric coupler, a first resistor and a second resistor; The negative electrode of the photoelectric coupler and the first end of the first resistor serve together as the output AC input end of the zero-crossing detection circuit, and are connected to the conversion isolation circuit to receive the output AC power; the positive electrode of the photoelectric coupler is connected to the second end of the first resistor, and the collector of the photoelectric coupler and the first end of the second resistor serve together as the inspection signal output end of the zero-crossing detection circuit, and are connected to the microprocessor to output the detection signal; the emitter of the photoelectric coupler is connected to the power ground.

7. The dimming circuit according to claim 5, wherein: The switch circuit includes a relay, a first transistor, a first diode, a third resistor and a fourth resistor; The first end of the third resistor and the first end of the fourth resistor together serve as the switch circuit The control signal input terminal of the fourth resistor is connected to the microprocessor to receive the control signal; the second end of the fourth resistor is connected to the base of the first transistor, the collector of the first transistor is connected to the first control terminal of the relay and the positive electrode of the first diode, the second control terminal of the relay and the negative electrode of the first diode jointly serve as the first DC input terminal of the switching circuit to receive the first DC power; the common terminal of the relay serves as the input AC output terminal of the switching circuit to output the input AC power; the normally open terminal of the relay serves as the input AC input terminal of the switching circuit, connected to the conversion isolation circuit to receive the input AC power; the emitter of the first transistor and the second end of the third resistor are commonly connected to the power ground.

8. The dimming circuit according to claim 5, wherein: Also includes: a rectifier circuit, connected to the conversion isolation circuit, configured to rectify the output alternating current to output a first direct current to power the switching circuit; A voltage stabilizing circuit is connected to the rectifier circuit and is configured to stabilize the first direct current to power the wireless communication circuit and the microprocessor.

9. The dimming circuit according to claim 1, wherein: The wireless communication signal and the first wired communication signal both carry a dimming flag, and the microprocessor is specifically configured to set the port corresponding to the dimming flag to a first level.

10. The dimming circuit according to claim 1, wherein: Both the wireless communication signal and the first wired communication signal carry continuous dimming instructions, and the microprocessor is specifically configured to cyclically set each port in the port group to the first level in turn according to the continuous dimming instruction, so as to cyclically connect the second end of each adjustment resistor to the power ground in turn.

11. The dimming circuit according to claim 8, wherein: The wireless communication signal and the first wired communication signal both carry a dimming termination instruction, and the microprocessor is specifically configured to stop sequentially setting the ports in the port group to the first level in a loop according to the dimming termination instruction, and maintain the current first level port settings.

12. The dimming circuit according to any one of claims 1 to 11, characterized in that: The port group includes a first general-purpose input / output terminal of the microprocessor, a second general-purpose input / output terminal of the microprocessor, a third general-purpose input / output terminal of the microprocessor, a fourth general-purpose input / output terminal of the microprocessor, a fifth general-purpose input / output terminal of the microprocessor, a sixth general-purpose input / output terminal of the microprocessor, a seventh general-purpose input / output terminal of the microprocessor, an eighth general-purpose input / output terminal of the microprocessor, a ninth general-purpose input / output terminal of the microprocessor, a tenth general-purpose input / output terminal of the microprocessor, and an eleventh general-purpose input / output terminal of the microprocessor; a power supply terminal of the microprocessor is connected to a stabilized first direct current; a twelfth general-purpose input / output terminal of the microprocessor is connected to a first wired communication signal; a thirteenth general-purpose input / output terminal of the microprocessor outputs a control signal; a fourteenth general-purpose input / output terminal of the microprocessor is connected to a detection signal; and a ground terminal of the microprocessor is connected to a power ground.

13. The dimming circuit according to any one of claims 1 to 11, characterized in that: The wireless communication circuit includes a wireless receiving chip, a first inductor, a second inductor, a first capacitor, a second capacitor and an antenna; The power supply terminal of the wireless receiving chip serves as the first DC input terminal of the wireless communication circuit to receive the stabilized first DC power; the data output terminal of the wireless receiving chip serves as the first DC input terminal of the wireless communication circuit to receive the stabilized first DC power; a first wired communication signal output terminal of the communication circuit, connected to the microprocessor to output the first wired communication signal; The RF input end of the wireless receiving chip is connected to the first end of the first inductor and the first end of the first capacitor, the second end of the first inductor is connected to the first end of the second capacitor, the second end of the second inductor and the antenna, and the ground end of the wireless receiving chip is connected to the power ground.

14. A dimmer, characterized in that: The dimmer comprises the dimming circuit according to any one of claims 1 to 13.

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