CN112770461A - Dimming circuit and dimming equipment - Google Patents
Dimming circuit and dimming equipment Download PDFInfo
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- CN112770461A CN112770461A CN202011559109.0A CN202011559109A CN112770461A CN 112770461 A CN112770461 A CN 112770461A CN 202011559109 A CN202011559109 A CN 202011559109A CN 112770461 A CN112770461 A CN 112770461A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention is suitable for the technical field of dimming circuits, and provides a dimming circuit and dimming equipment. The dimming circuit includes: the device comprises a power taking module, a zero-crossing detection module, a voltage conversion module, a control module and a dimming module; the zero-crossing detection module is connected with a live wire through a first output end of the electricity taking module, a second input end of the zero-crossing detection module is used for being connected with a zero wire, a third input end of the zero-crossing detection module is connected with a first output end of the dimming module, a fourth input end of the zero-crossing detection module is connected with a second output end of the dimming module, and the first output end of the dimming module and the second output end of the dimming module are directly used for being connected with an external lamp or connected with a rebound switch or a mechanical switch to form a double-control switch. The dimming circuit provided by the embodiment of the invention can realize the compatibility of a zero line or a single line, can be independently used or compatible with the original mechanical switch or rebound switch for double control, and has high compatibility and convenient use.
Description
Technical Field
The invention belongs to the technical field of dimming circuits, and particularly relates to a dimming circuit and dimming equipment.
Background
Along with the intelligent popularization of household products, various intelligent dimming devices appear in the market at present so as to meet the requirements of people on dimming, double-control and remote dimming through a mobile phone APP.
However, in the existing intelligent dimming devices, the intelligent dimming device of the zero line and the live line has low compatibility with a building system wired in an early single-live line mode, and needs to be rewired for the whole building; the intelligent dimming device of a single live wire generally cannot be combined with a traditional mechanical switch or a rebound switch to realize a double-control function, or when the traditional mechanical switch or the rebound switch is replaced to realize the double-control function, an internal circuit needs to be adjusted, the installation is complex, and the compatibility is not high.
Disclosure of Invention
In view of this, embodiments of the present invention provide a dimming circuit and a dimming device to solve the problem of poor compatibility of the existing dimming circuit.
A first aspect of an embodiment of the present invention provides a dimming circuit, including: the device comprises a power taking module, a zero-crossing detection module, a voltage conversion module, a control module and a dimming module;
the first input end of the power taking module is used for being connected with a live wire, the second input end of the power taking module is used for being connected with a zero wire, the third input end of the power taking module is connected with the first output end of the dimming module, the fourth input end of the power taking module is connected with the second output end of the dimming module, the first output end of the power taking module is respectively connected with the first input end of the zero-crossing detection module and the first input end of the dimming module, and the second output end of the power taking module is connected with the first input end of the voltage conversion module;
the second input end of the zero-crossing detection module is used for being connected with a zero line, the third input end of the zero-crossing detection module is connected with the first output end of the dimming module, the fourth input end of the zero-crossing detection module is connected with the second output end of the dimming module, the fifth input end of the zero-crossing detection module is connected with the first output end of the voltage conversion module, and the output end of the zero-crossing detection module is connected with the first input end of the control module;
a second output end of the voltage conversion module is connected with a second input end of the control module, and a third output end of the voltage conversion module is connected with a third input end of the dimming module;
the output end of the control module is connected with the second input end of the dimming module;
the first output end of the dimming module is used for being connected with one end of an external lamp or a mechanical switch, and the second output end of the dimming module is suspended or used for being connected with one end of the rebound switch or the other end of the mechanical switch.
Optionally, the zero-crossing detection module includes: the device comprises a first detection unit, a second detection unit, a third detection unit and a fourth detection unit;
the first input end of the first detection unit, the first input end of the second detection unit, the first input end of the third detection unit and the first input end of the fourth detection unit are jointly used as a fifth input end of the zero-crossing detection module;
a second input end of the first detection unit is used as a first input end of the zero-crossing detection module, a second input end of the second detection unit is used as a second input end of the zero-crossing detection module, a second input end of the third detection unit is used as a third input end of the zero-crossing detection module, and a second input end of the fourth detection unit is used as a fourth input end of the zero-crossing detection module;
the output end of the first detection unit, the output end of the second detection unit, the output end of the third detection unit and the output end of the fourth detection unit are jointly used as the output end of the zero-crossing detection module.
Optionally, the first detecting unit includes: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a diode D1, a diode D2, a capacitor C1, a capacitor C2, a capacitor C3 and a comparator chip U1;
one end of the resistor R1 is used as a second input end of the first detection unit, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is respectively connected with the anode of the diode D1, the cathode of the diode D2 and one end of the resistor R3, and the other end of the resistor R3 is respectively connected with one end of the capacitor C1 and the non-inverting input end of the comparator chip U1;
the cathode of the diode D1 and the anode of the diode D2 are both connected with one end of the resistor R4 and then grounded, the anode of the diode D2 is also connected with the other end of the capacitor C1, and the other end of the resistor R4 is connected with the inverting input end of the comparator chip U1;
the ground terminal of the comparator chip U1 is grounded, the power terminal of the comparator chip U1 is used as the first input terminal of the first detection unit, and the power terminal of the comparator chip U1 is also grounded after being connected in series with the capacitor C2;
the output end of the comparator chip U1 is connected with one end of the resistor R5, the other end of the resistor R5 is used as the output end of the first detection unit, and the other end of the resistor R5 is connected with the capacitor C3 in series and then grounded.
Optionally, the second detecting unit includes: the circuit comprises a resistor R6, a resistor R7, a resistor R8, a resistor R9, a diode D3 and a capacitor C4;
one end of the resistor R6 is used as a second input end of the second detection unit, and the other end of the resistor R6 is connected with the resistor R7 and the resistor R8 in series and then grounded;
the connection ends of the resistor R7 and the resistor R8 are respectively connected with the anode of the diode D3 and one end of the resistor R9;
the cathode of the diode D3 is used as a first input end of the second detection unit;
the other end of the resistor R9 is used as the output end of the second detection unit, and the other end of the resistor R9 is connected in series with the capacitor C4 and then grounded.
Optionally, the circuit structures of the third detection unit and the fourth detection unit are the same;
the third detection unit includes: the circuit comprises a resistor R10, a resistor R11, a resistor R12, a resistor R13, a diode D4, a capacitor C5, a capacitor C6 and a switching tube Q1;
one end of the resistor R10 is used as a second input end of the third detection unit, the other end of the resistor R10 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to the anode of the diode D4, and the cathode of the diode D4 is connected to one end of the resistor R12, one end of the capacitor C5 and the gate of the switching tube Q1, respectively;
the other end of the resistor R12, the other end of the capacitor C5, the source of the switch tube Q1 and one end of the capacitor C6 are connected and then grounded;
the other end of the capacitor C6 is used as the output end of the third detection unit, and the other end of the capacitor C6 is further connected with the drain of the switching tube Q1;
the drain of the switching tube Q1 is also connected in series with the resistor R13 to serve as the first input terminal of the third detecting unit.
Optionally, the dimming module includes: a dimming control unit and a driving unit;
a first input end of the dimming control unit is used as a first input end of the dimming module, a second input end of the dimming control unit is connected with an output end of the driving unit, a first output end of the dimming control unit is used as a first output end of the dimming module, and a second output end of the dimming control unit is used as a second output end of the dimming module;
the first input end of the driving unit is used as the second input end of the dimming module, and the second input end of the driving unit is used as the third input end of the dimming module.
Optionally, the dimming control unit further includes a third input end and a fourth input end, the third input end of the dimming control unit is connected to the fourth output end of the voltage conversion module, and the fourth input end of the dimming control unit is connected to the second output end of the control module;
the dimming control unit includes: the circuit comprises a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a diode D6, a capacitor C9, a capacitor C10, a capacitor C11, a switch tube Q3, a switch tube Q4, a triode Q5 and a single-pole double-throw relay K1;
the drain of the switching tube Q3 is used as a first input end of the dimming control unit, and the drain of the switching tube Q3 is connected with the gate of the switching tube Q3 after being connected with the capacitor C9 and the resistor R18 in series;
the source of the switching tube Q3 is connected to one end of the resistor R19 and then grounded, the other end of the resistor R19 is connected to the source of the switching tube Q4, the drain of the switching tube Q4 is connected to the gate of the switching tube Q4 after being connected in series with the capacitor C10 and the resistor R20, and the gate of the switching tube Q3 and the gate of the switching tube Q4 are both used as second input ends of the dimming control unit;
the drain of the switching tube Q4 is further connected to a common contact of the single-pole double-throw relay K1, a normally closed contact of the single-pole double-throw relay K1 serves as a first output end of the dimming control unit, a normally open contact of the single-pole double-throw relay K1 serves as a second output end of the dimming control unit, a first coil terminal of the single-pole double-throw relay K1 is connected to an anode of the diode D6 and a collector of the triode Q5, and a cathode of the diode D6 is connected to a second coil terminal of the single-pole double-throw relay K1 and serves as a third input end of the dimming control unit;
the base electrode of the triode Q5 is connected with one end of the capacitor C11 and one end of the resistor R22, respectively, the other end of the resistor R22 is used as the fourth input end of the dimming control unit, the other end of the resistor R22 is further connected with one end of the resistor R21, and the other end of the resistor R21 is connected with the other end of the capacitor C11 and the emitter of the triode Q5 and then grounded.
Optionally, the dimming control unit includes: a resistor R23, a resistor R24, a resistor R25, a resistor R26, a capacitor C12, a capacitor C13, a capacitor C14, a switching tube Q6, a switching tube Q7 and a switching tube Q8;
the drain of the switching tube Q6 is used as a first input end of the dimming control unit, and the drain of the switching tube Q6 is connected with the gate of the switching tube Q6 after being connected with the capacitor C12 and the resistor R23 in series;
the source of the switching tube Q6 is connected to one end of the resistor R24 and then grounded, the other end of the resistor R24 is connected to the source of the switching tube Q7 and the source of the switching tube Q8, respectively, the drain of the switching tube Q7 is used as the first output end of the dimming control unit, and the drain of the switching tube Q7 is connected to the gate of the switching tube Q7 after being connected in series with the capacitor C13 and the resistor R25;
the drain of the switching tube Q8 is used as the second output end of the dimming control unit, and the drain of the switching tube Q8 is connected with the gate of the switching tube Q8 after being connected with the capacitor C14 and the resistor R26 in series;
the gate of the switching tube Q6, the gate of the switching tube Q7 and the gate of the switching tube Q8 are all used as the second input end of the dimming control unit.
Optionally, the driving unit includes at least one driving circuit;
the driving circuit includes: the circuit comprises a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a diode D7, a diode D8, a diode D9, a diode D10, a capacitor C15, a triode Q9, a triode Q10, a triode Q11 and a triode Q12;
one end of the resistor R27 is used as a first input end of the driving unit, the other end of the resistor R27 is respectively connected with one end of the resistor R28 and the base of the transistor Q9, and the other end of the resistor R28, the emitter of the transistor Q9 and one end of the resistor R29 are grounded after being connected;
a collector of the triode Q9 is connected with one end of the resistor R30, the other end of the resistor R30 is respectively connected with a base of the triode Q10 and one end of the resistor R31, and the other end of the resistor R31 is connected with an emitter of the triode Q10 and then serves as a second input end of the driving unit;
the collector of the triode Q10 is connected with the other end of the resistor R29 and then is respectively connected with the cathode of the diode D7 and the anode of the diode D8, the anode of the diode D7 is connected with the base of the triode Q11, and the collector of the triode Q11 is grounded;
an emitter of the transistor Q11 is connected to an anode of the diode D9 and one end of the resistor R32, respectively, the other end of the resistor R32 is connected to one end of the resistor R33, a cathode of the diode D9, an anode of the diode D10, one end of the capacitor C15 and one end of the resistor R34, respectively, a cathode of the diode D10 and the other end of the resistor R33 are both connected to an emitter of the transistor Q12, a base of the transistor Q12 is connected to a cathode of the diode D8, and a collector of the transistor Q12 is also used as a second input terminal of the driving unit;
the other end of the capacitor C15 is grounded;
the other end of the resistor R34 is connected with one end of the resistor R35 to serve as the output end of the driving unit, and the other end of the resistor R35 is grounded.
A second aspect of embodiments of the present invention provides a dimming device comprising a dimming circuit as described in any one of the above.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: according to the embodiment of the invention, the first input end of the zero-crossing detection module and the second input end of the zero-crossing detection module can judge whether the dimming circuit is used for single live wire connection or zero live wire connection, the third input end of the zero-crossing detection module and the fourth input end of the zero-crossing detection module, as well as the first output end of the dimming module and the second output end of the dimming module can judge whether the dimming circuit is used alone or forms a double-control switch with a mechanical switch or forms a double-control switch with a rebound switch, and dimming is carried out through the dimming module under any working condition. When the embodiment of the invention is compatible with a power supply mode of a zero live wire or a single live wire, the embodiment of the invention can also be compatible with the original mechanical switch or rebound switch for double control, or can directly replace the original single live wire dimming equipment, and has high compatibility and convenient use.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a dimming circuit provided in an embodiment of the present invention;
fig. 2 is a schematic diagram of a dimming circuit according to another embodiment of the present invention;
fig. 3 is a schematic diagram of a dimming circuit according to another embodiment of the present invention;
fig. 4 is a schematic diagram of an AC-DC circuit structure in a voltage conversion module according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a circuit structure of DC-DC in the voltage conversion module according to the embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a control module according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a control module according to another embodiment of the present invention;
FIG. 8 is a schematic diagram of a zero crossing detection module provided by an embodiment of the invention;
fig. 9 is a schematic circuit structure diagram of a first detection unit according to an embodiment of the present invention;
fig. 10 is a schematic circuit diagram of a second detecting unit according to an embodiment of the present invention;
fig. 11 is a schematic circuit diagram of a third detecting unit according to an embodiment of the present invention;
fig. 12 is a schematic circuit diagram of a fourth detecting unit according to an embodiment of the present invention;
fig. 13 is a schematic diagram of a dimming module provided in an embodiment of the present invention;
fig. 14 is a schematic circuit diagram of a dimming control unit according to an embodiment of the present invention;
fig. 15 is a schematic circuit diagram of a dimming control unit according to another embodiment of the present invention;
fig. 16 is a schematic circuit diagram of an over-temperature protection module according to an embodiment of the present invention;
fig. 17 is a schematic circuit structure diagram of an over-current detection module according to an embodiment of the present invention;
fig. 18 is a schematic circuit diagram of an RF module according to an embodiment of the present invention;
fig. 19 is a schematic circuit diagram of a dimming/switching key according to an embodiment of the present invention;
fig. 20 is a schematic circuit diagram of a reset button according to an embodiment of the present invention;
fig. 21 is a schematic circuit diagram of a power down detection module according to an embodiment of the present invention;
fig. 22 is a schematic circuit diagram of a load type detection module according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1 to 3, a dimming circuit 10 according to an embodiment of the present invention is described, where the dimming circuit includes a power taking module 11, a zero-crossing detection module 12, a voltage conversion module 13, a control module 14, and a dimming module 15.
The first input end of the power taking module 11 is used for being connected with a live wire L, the second input end of the power taking module 11 is used for being connected with a zero wire N, the third input end of the power taking module 11 is connected with a first output end T1 of the dimming module 15, the fourth input end of the power taking module 11 is connected with a second output end T2 of the dimming module 15, the first output end of the power taking module 11 is connected with the first input end of the zero-crossing detection module 12 and the first input end of the dimming module 15 respectively, and the second output end of the power taking module 11 is connected with the first input end of the voltage conversion module 13.
The second input end of the zero-crossing detection module 12 is used for being connected with the zero line N, the third input end of the zero-crossing detection module 12 is connected with the first output end T1 of the dimming module 15, the fourth input end of the zero-crossing detection module 12 is connected with the second output end T2 of the dimming module 15, the fifth input end of the zero-crossing detection module 12 is connected with the first output end of the voltage conversion module 13, and the output end of the zero-crossing detection module 12 is connected with the first input end of the control module 14.
A second output end of the voltage conversion module 13 is connected to a second input end of the control module 14, and a third output end of the voltage conversion module 13 is connected to a third input end of the dimming module 14.
An output of the control module 14 is connected to a second input of the dimming module 15.
The first output end T1 of the dimming module 15 is used for being connected with one end of an external lamp or a mechanical switch, and the second output end T2 of the dimming module 15 is suspended or used for being connected with one end of a rebound switch or the other end of the mechanical switch.
Referring to fig. 14 or 15, the power-taking module 11 includes a thermal relay FR3, a capacitor C16, a varistor RV1, a diode D11, a diode D12, a diode D13, a diode D14, and a diode D15. One end of the thermal relay FR3 connected to the anode of the diode D11 serves as a first output end Sx of the power-taking module 11, and one end of the diode D12 connected to the cathode of the diode D13 serves as a second output end a of the power-taking module 11. With reference to fig. 4 and 5, the first output terminal T1 of the dimming module 15 is connected to the power taking module 11 through the diode D14, and the second output terminal T2 of the dimming module 15 is connected to the power taking module 11 through the diode D15, so that when the dimming circuit 10 supplies power for a single live wire, the dimming circuit reaches the second output terminal a of the power taking module 11 through the diode D13 and is connected to the first input terminal of the voltage conversion module 13, thereby forming a power taking loop when the single live wire supplies power. When the dimming circuit 10 supplies power to the zero line and the live line, the zero line N passes through the diode D12, and the live line reaches the second output end a of the power taking module 11 through the diode D11 and the diode D13 to be connected with the first input end of the voltage conversion module 13, so that a power taking loop during the power supply of the zero line and the live line is formed. The dimming circuit of the embodiment can be compatible with zero live wire power supply and single live wire power supply.
Referring to fig. 4 to 7, the voltage conversion module is mainly used to convert the commercial power 100-240VAC input into the direct current voltage VCC and the direct current voltage VDD, for example, the voltage conversion module may include an AC-DC unit and a DC-DC unit, the AC-DC unit may convert the commercial power into the direct current voltage VCC through the second output terminal a of the power-taking module, the DC-DC unit may further convert the direct current voltage VCC into the direct current voltage VDD, for example, the direct current voltage VCC output by the AC-DC unit may be 15V, which serves as the third output terminal of the voltage conversion module, the direct current voltage VDD output by the DC-DC unit may be 3.3V, which serves as the first output terminal, the second output terminal, and the fourth output terminal of the voltage conversion module, so as to provide input power for devices in different modules in the dimming circuit, for example, power is supplied to the devices in the zero-crossing detection module through the first output terminal of the voltage conversion module, or the second output end of the voltage conversion module supplies power to the control module, or the third output end of the voltage conversion module supplies driving voltage to the dimming module. According to the working voltage of the supplied power device, the voltages output by the first output end of the voltage conversion module, the second output end of the voltage conversion module, the third output end of the voltage conversion module and the fourth output end of the voltage conversion module can be the same, and the voltages output by each output end of the voltage conversion module can also be different. The zero-crossing detection module is mainly used for converting mains supply input voltage into square wave output, detecting the zero position of the mains supply input voltage, serving as a dimming Pulse Width Modulation (PWM) output reference point of the control module, and detecting waveforms output by a first output end and a second output end of the dimming module, and providing criteria for the control module to automatically judge whether the dimming circuit is used alone or matched with a mechanical switch or a rebound switch. The control module is mainly used for making judgment according to the output of the zero-crossing detection module and outputting dimming PWM signals or dimming DIMOUT1-DIMOUT3 signals by combining the structure of the dimming module. The dimming module is mainly used for dimming control according to a dimming PWM signal or a dimming DIMOUT1-DIMOUT3 signal.
Referring to fig. 1 to 3, when the dimming circuit provided in this embodiment is applied, the first input end of the zero-cross detection module and the first input end of the dimming module may be connected to a live wire through the first output end of the power taking module, and the first input end of the voltage conversion module is connected to the first output end of the dimming module through the third input end of the power taking module, or connected to the second output end of the dimming module through the fourth input end of the power taking module, so as to implement single live wire power supply; the first input end of the zero-crossing detection module and the first input end of the dimming module can be connected with the live wire through the first output end of the power taking module, meanwhile, the second input end of the zero-crossing detection module is connected with the zero wire, and the first input end of the voltage conversion module is connected with the live wire and the zero wire through the second output end of the power taking module, so that zero-live wire power supply is achieved. Meanwhile, the dimming circuit can be used independently, namely the first output end of the dimming module is connected with one end of an external lamp, and the other end of the external lamp is connected with a zero line; the dimming circuit can be matched with the mechanical switch to realize a double-control function, namely, the first output end of the dimming module is connected with one end of the mechanical switch, the second output end of the dimming module is connected with the other end of the mechanical switch, the public end of the mechanical switch is connected with one end of an external lamp, and the other end of the external lamp is connected with a zero line; the light adjusting circuit can be selected to be matched with the rebound switch for use, so that a double-control function is realized, namely, the first output end of the light adjusting module is connected with one end of an external lamp, the second output end of the light adjusting module is connected with one end of the rebound switch, and the other end of the rebound switch is connected with the zero line after being connected with the other end of the external lamp.
After the dimming circuit selects different connection modes, the dimming range can be automatically adjusted according to different wiring modes, namely dimming of 0-100% can be realized during zero-live-wire power supply, dimming of 0-X% can be realized during single-live-wire power supply, wherein X <100, and the specific numerical value of X can be determined by performing adaptation test according to a load list.
According to the embodiment of the invention, the first input end of the zero-crossing detection module and the second input end of the zero-crossing detection module can be used for judging whether the dimming circuit is used for single live wire connection or zero live wire connection, the third input end of the zero-crossing detection module and the fourth input end of the zero-crossing detection module, the first output end of the dimming module and the second output end of the dimming module can be used for judging whether the dimming circuit is used alone or forms a double-control switch with a mechanical switch or forms a double-control switch with a rebound switch, and dimming is carried out through the dimming module under any working condition. When the embodiment of the invention is compatible with a power supply mode of a zero live wire or a single live wire, the embodiment of the invention can also be compatible with the original mechanical switch or rebound switch for double control, or can directly replace the original single live wire dimming equipment, and has high compatibility and convenient use.
Optionally, referring to fig. 8, the zero crossing detection module 12 may include: a first detecting unit 121, a second detecting unit 122, a third detecting unit 123, and a fourth detecting unit 124.
A first input terminal of the first detecting unit 121, a first input terminal of the second detecting unit 122, a first input terminal of the third detecting unit 123, and a first input terminal of the fourth detecting unit 124 are commonly used as a fifth input terminal of the zero-crossing detecting module 12.
A second input terminal of the first detecting unit 121 serves as a first input terminal of the zero-crossing detecting module 12, a second input terminal of the second detecting unit 122 serves as a second input terminal of the zero-crossing detecting module 12, a second input terminal of the third detecting unit 123 serves as a third input terminal of the zero-crossing detecting module 12, and a second input terminal of the fourth detecting unit 124 serves as a fourth input terminal of the zero-crossing detecting module 12.
The output end of the first detection unit 121, the output end of the second detection unit 122, the output end of the third detection unit 123 and the output end of the fourth detection unit 124 are used as the output end of the zero-crossing detection module 12.
Alternatively, referring to fig. 9, the first detection unit 121 may include: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a diode D1, a diode D2, a capacitor C1, a capacitor C2, a capacitor C3 and a comparator chip U1.
One end of the resistor R1 is used as a second input end of the first detection unit 121, the other end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the anode of the diode D1, the cathode of the diode D2, and one end of the resistor R3, and the other end of the resistor R3 is connected to one end of the capacitor C1 and the non-inverting input end + IN of the comparator chip U1.
The cathode of the diode D1 and the anode of the diode D2 are both connected with one end of the resistor R4 and then grounded, the anode of the diode D2 is also connected with the other end of the capacitor C1, and the other end of the resistor R4 is connected with the inverting input end-IN of the comparator chip U1.
The ground terminal V-of the comparator chip U1 is grounded, the power terminal V + of the comparator chip U1 serves as the first input terminal of the first detection unit 121, and the power terminal V + of the comparator chip U1 is also connected in series with the capacitor C2 and then grounded.
The output terminal OUT of the comparator chip U1 is connected to one end of a resistor R5, the other end of the resistor R5 serves as the output terminal of the first detection unit 121, and the other end of the resistor R5 is connected in series with a capacitor C3 and then grounded.
The second input end of the first detection unit 121 may be connected to the live wire L through the first output end Sx of the power taking module 11, that is, one end of the resistor R1 is connected to the Sx point, and the Sx point is connected to the live wire L through the thermal relay FR 3. The resistor R1 is connected to the live line L via the thermal relay FR3, and can protect the circuit of the first detection unit.
The power supply terminal V + of the comparator chip U1 is used as the first input terminal of the first detection unit 121, that is, the first output terminal of the voltage conversion module 13 is connected to the power supply terminal V + of the comparator chip U1, and the voltage conversion module converts the commercial power into the voltage required by the comparator chip.
In the first detection unit 121, the output signal ZERO1 is obtained by connecting the first detection unit to the live line L through a resistor R1 via a thermal relay FR3 and comparing the result with a comparator chip U1.
Alternatively, referring to fig. 10, the second detection unit 122 may include: the circuit comprises a resistor R6, a resistor R7, a resistor R8, a resistor R9, a diode D3 and a capacitor C4.
One end of the resistor R6 is used as a second input end of the second detecting unit 122, and the other end of the resistor R6 is connected in series with the resistor R7 and the resistor R8 and then grounded.
The connection ends of the resistor R7 and the resistor R8 are connected to the anode of the diode D3 and one end of the resistor R9, respectively.
The cathode of the diode D3 serves as a first input terminal of the second detection unit 122.
The other end of the resistor R9 is used as the output terminal of the second detecting unit 122, and the other end of the resistor R9 is connected in series with the capacitor C4 and then grounded.
The resistor R6 is directly connected to the neutral line N, the cathode of the diode D3 is used as the first input terminal of the second detecting unit 122, that is, the first output terminal of the voltage converting module 13 is connected to the cathode of the diode D3, and the other end of the resistor R9 is used as the output terminal of the second detecting unit 122, so as to obtain the output signal ZERO 2.
In conjunction with the first and second detection units 121 and 122, the output signals ZERO1 and ZERO2 are output to the control module 14 to detect whether the dimming circuit is single hot line powered or ZERO hot line powered.
When the dimming circuit of the embodiment is applied, after the mains supply of the dimming circuit is powered on, the control module firstly detects an output signal ZERO1 and an output signal ZERO2, and if the ZERO2 detects 50/60Hz square waves, the dimming circuit is judged to supply power for a ZERO-fire line; when the ZERO2 is detected to be low, and the ZERO1 is 50/60Hz square wave, the dimming circuit is determined to be supplying single live wire. Subsequently, as long as the dimming circuit is not powered down, dimming is controlled according to the detection result, and if the single live wire is powered on, the ZERO1 signal is used as a dimming phase-cut reference point; if the ZERO live wire is supplied with power, the ZERO1 signal can be used as a dimming phase-cut reference point, and the ZERO2 signal can be used as a dimming phase-cut reference point.
Alternatively, referring to fig. 11 and 12, the third detecting unit 123 and the fourth detecting unit 124 have the same circuit structure, and the third detecting unit 123 may include: the circuit comprises a resistor R10, a resistor R11, a resistor R12, a resistor R13, a diode D4, a capacitor C5, a capacitor C6 and a switching tube Q1.
One end of the resistor R10 is used as a second input end of the third detection unit 123, the other end of the resistor R10 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to the anode of the diode D4, and the cathode of the diode D4 is connected to one end of the resistor R12, one end of the capacitor C5, and the gate of the switching tube Q1.
The other end of the resistor R12, the other end of the capacitor C5, the source of the switch tube Q1 and one end of the capacitor C6 are connected to ground.
The other end of the capacitor C6 is used as the output end of the third detecting unit 123, and the other end of the capacitor C6 is further connected to the drain of the switching tube Q1.
The drain of the switching tube Q1 is also connected in series with the resistor R13 to serve as the first input terminal of the third detecting unit 123.
The third detection unit is used for detecting a first output end of the dimming module and outputting a signal ZERO3, and the fourth detection unit is used for detecting a second output end of the dimming module and outputting a signal ZERO 4. In conjunction with the third and fourth detection units, output signals ZERO3 and ZERO4 are output to the control module to detect whether the dimmer circuit is used alone, in combination with a mechanical switch, or in combination with a rebound switch.
Alternatively, referring to fig. 13, the dimming module 15 may include: a dimming control unit 151 and a driving unit 152.
A first input end of the dimming control unit 151 serves as a first input end of the dimming module 15, a second input end of the dimming control unit 151 is connected with an output end of the driving unit 152, a first output end of the dimming control unit 151 serves as a first output end of the dimming module 15, and a second output end of the dimming control unit 151 serves as a second output end of the dimming module 15; the first input terminal of the driving unit 152 serves as the second input terminal of the dimming module 15, and the second input terminal of the driving unit 152 serves as the third input terminal of the dimming module 15.
Optionally, referring to fig. 13 and 14, the dimming control unit 151 further includes a third input end and a fourth input end, the third input end of the dimming control unit 151 is connected to the fourth output end of the voltage conversion module 13 to input a +3.3V voltage, and the fourth input end of the dimming control unit 151 is connected to the second output end of the control module 14 to input a relax signal.
Among them, the dimming control unit 151 may include: the circuit comprises a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a diode D6, a capacitor C9, a capacitor C10, a capacitor C11, a switch tube Q3, a switch tube Q4, a triode Q5 and a single-pole double-throw relay K1.
The drain of the switching tube Q3 is used as the first input terminal of the dimming control unit 151, and the drain of the switching tube Q3 is further connected in series with the capacitor C9 and the resistor R18 and then connected to the gate of the switching tube Q3.
The source of the switching tube Q3 is connected to one end of the resistor R19 and then grounded, the other end of the resistor R19 is connected to the source of the switching tube Q4, the drain of the switching tube Q4 is connected in series with the capacitor C10 and the resistor R20 and then connected to the gate of the switching tube Q4, and the gate of the switching tube Q3 and the gate of the switching tube Q4 are both used as second input terminals of the dimming control unit 151.
The drain of the switching tube Q4 is further connected to a common contact of the single-pole double-throw relay K1, a normally closed contact of the single-pole double-throw relay K1 serves as a first output end of the dimming control unit 151, a normally open contact of the single-pole double-throw relay K1 serves as a second output end of the dimming control unit 151, a first coil terminal of the single-pole double-throw relay K1 is connected to an anode of the diode D6 and a collector of the triode Q5, and a cathode of the diode D6 is connected to a second coil terminal of the single-pole double-throw relay K1 and then serves as a third input end of the dimming control unit 151.
The base of the triode Q5 is connected to one end of the capacitor C11 and one end of the resistor R22, respectively, the other end of the resistor R22 is used as the fourth input end of the dimming control unit 151, the other end of the resistor R22 is further connected to one end of the resistor R21, and the other end of the resistor R21 is connected to the other end of the capacitor C11 and the emitter of the triode Q5 and then grounded.
The RELAY signal output by the control module controls the actions of the normally open contact and the normally closed contact of the single-pole double-throw RELAY. The voltage output by the fourth output end of the voltage conversion module is used for a single-pole double-throw relay in the dimming control unit, and according to the working voltage of the single-pole double-throw relay, the voltage output by the fourth output end of the voltage conversion module can be the same as the voltage output by the first output end and the voltage output by the second output end of the voltage conversion module, and can also be different from the voltage output by the first output end and the voltage output by the second output end of the voltage conversion module.
Wherein, when third detecting element and fourth detecting element used with the cooperation of the control unit of adjusting luminance of this embodiment, the back is gone up to the circuit of adjusting luminance, control module detects output signal ZERO3 and ZERO4, if ZERO3 is the square wave always, ZERO4 is fixed high level always simultaneously, show that the circuit of adjusting luminance uses alone, outside lamps and lanterns can only connect the first output T1 of the module of adjusting luminance this moment, single-pole double-throw relay K1 keeps the closed state of normally closed contact always this moment, control module gives the drive unit of the module of adjusting luminance through output PWM signal, drive unit drive switch tube Q3 and switch tube Q4 action, in order to accomplish the switch or the adjusting luminance of the circuit to outside lamps and lanterns.
Referring to table 1, if the control module detects that ZERO3 and ZERO4 are both square waves shown in table 1, it can be determined that the external double-control switch of the dimming circuit is a rebound switch, then the switch and dimming of the subsequent dimming circuit are both controlled according to the logic of the rebound switch, namely, the relay is fixed at the position of a normally closed contact, the rebound switch is pressed as a switch for short time and as a dimming for long time, and meanwhile, the switch tube Q3 and the switch tube Q4 can be controlled by the PWM signal output by the control module to perform switching and dimming control.
Table 1 ZERO3 and ZERO4 correspond truth table when external rebound switch
Referring to table 2, if the control module detects that ZERO3 is at a high level and ZERO4 is a square wave shown in table 2, it can be determined that the dual-control switch externally connected to the dimming circuit is a mechanical switch, and then the switching and dimming of the subsequent dimming circuit are controlled according to the logic of the mechanical switch, that is, only the lamp is turned on and off when the mechanical switch is operated, and the switching tube Q3 and the switching tube Q4 are controlled by the PWM signal output by the control module to perform the switching and dimming control.
TABLE 2 truth table corresponding to ZERO3 and ZERO4 when external mechanical switch is operated
In this embodiment, the single-pole double-throw relay K1 keeps the closed state of the normally closed contact all the time, and the single-pole double-throw relay K1 is used in cooperation with the switching tube Q3 and the switching light Q4 to realize the double control function of the light adjusting circuit in cooperation with the mechanical switch and the rebound switch.
Exemplarily, referring to fig. 15, as another embodiment of the present invention, the dimming control unit 151 may include: the circuit comprises a resistor R23, a resistor R24, a resistor R25, a resistor R26, a capacitor C12, a capacitor C13, a capacitor C14, a switching tube Q6, a switching tube Q7 and a switching tube Q8.
The drain of the switching tube Q6 is used as the first input terminal of the dimming control unit 151, and the drain of the switching tube Q6 is further connected in series with the capacitor C12 and the resistor R23 and then connected to the gate of the switching tube Q6.
The source of the switch Q6 is connected to one end of the resistor R24 and then grounded, the other end of the resistor R24 is connected to the source of the switch Q7 and the source of the switch Q8, the drain of the switch Q7 is used as the first output end of the dimming control unit 151, and the drain of the switch Q7 is further connected to the gate of the switch Q7 after being connected in series with the capacitor C13 and the resistor R25.
The drain of the switching tube Q8 is used as the second output terminal of the dimming control unit 151, and the drain of the switching tube Q8 is connected in series with the capacitor C14 and the resistor R26 and then connected to the gate of the switching tube Q8.
The gate of the switching tube Q6, the gate of the switching tube Q7 and the gate of the switching tube Q8 are all used as the second input terminal of the dimming control unit 151.
When the third detection unit and the fourth detection unit are used in cooperation with the dimming control unit of the embodiment, after the dimming circuit is powered on, the control module detects output signals ZERO3 and ZERO4, the control module detects the output signals ZERO3 and ZERO4, if ZERO3 is always a square wave, and meanwhile ZERO4 is always a fixed high level, which indicates that the dimming circuit is used alone, at the moment, the external lamp can only be connected with the first output end T1 of the dimming module, the control module outputs DIMOUT1-DIMOUT3 signals to the driving unit of the dimming module, and the driving unit drives the switch tubes Q6, Q7 and Q8 to act, so as to complete the on-off or dimming of the external lamp by the dimming circuit.
Referring to table 3, after the dimming circuit is powered on, first, the switching tubes Q6 and Q7 are used in cooperation, at this time, if the control module detects that the ZERO3 and the ZERO4 are both square waves shown in table 3, it can be determined that the external dual-control switch of the dimming circuit is a rebound switch, then the switching and dimming of the subsequent dimming circuit are controlled according to the logic of the rebound switch, that is, the switching tubes Q6 and Q7 are used in cooperation, the rebound switch is pressed as a short switch and pressed as a long switch, and meanwhile, the switching tube Q6 and the switching tube Q7 can be controlled to be switched and dimmed through the dim 1 and dim 3 signals output by the control module.
TABLE 3 truth table corresponding to ZERO3 and ZERO4 when externally connected with rebound switch
Referring to table 4, if the control module detects that ZERO3 is at a high level and ZERO4 is a square wave shown in table 4, it can be determined that the dual-control switch externally connected to the dimming circuit is a mechanical switch, and then the switching and dimming of the subsequent dimming circuit are controlled according to the logic of the mechanical switch, that is, only the lamp is turned on and off when the mechanical switch is operated, and the switching tube Q6 and the switching tube Q7 are controlled by the signals of DIMOUT1 and DIMOUT3 output by the control module, or the switching tube Q6 and the switching tube Q8 are controlled by the signals of DIMOUT1 and DIMOUT2 output by the control module.
TABLE 4 truth table corresponding to ZERO3 and ZERO4 when external mechanical switch is operated
In this embodiment, the control switch tube Q6 and the switch tube Q7 are used in cooperation, so that the dimming circuit can be used alone or the dimming circuit and the rebound switch can be used in cooperation to form the dual-control switch, or the dimming circuit and the mechanical switch can be used in cooperation to form the dual-control switch, and in addition, the control switch tube Q6 and the switch tube Q8 are used in cooperation to form the dual-control switch. The simple convenient realization of this embodiment dimming circuit and resilience switch, mechanical switch's compatibility, circuit structure is simple moreover, is convenient for realize.
Optionally, referring to fig. 14 and fig. 15, the driving unit 152 includes at least one driving circuit 1521, where the driving circuit 1521 may include: the circuit comprises a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a diode D7, a diode D8, a diode D9, a diode D10, a capacitor C15, a triode Q9, a triode Q10, a triode Q11 and a triode Q12.
One end of the resistor R27 is used as a first input end of the driving unit 152, the other end of the resistor R27 is connected to one end of the resistor R28 and the base of the transistor Q9, and the other end of the resistor R28, the emitter of the transistor Q9 and one end of the resistor R29 are grounded after being connected.
The collector of the transistor Q9 is connected to one end of the resistor R30, the other end of the resistor R30 is connected to the base of the transistor Q10 and one end of the resistor R31, and the other end of the resistor R31 is connected to the emitter of the transistor Q10 and then serves as the second input terminal of the driving unit 152.
The collector of the triode Q10 is connected with the other end of the resistor R29 and then is respectively connected with the cathode of the diode D7 and the anode of the diode D8, the anode of the diode D7 is connected with the base of the triode Q11, and the collector of the triode Q11 is grounded.
An emitter of the transistor Q11 is connected to an anode of the diode D9 and one end of the resistor R32, the other end of the resistor R32 is connected to one end of the resistor R33, a cathode of the diode D9, an anode of the diode D10, one end of the capacitor C15, and one end of the resistor R34, a cathode of the diode D10 and the other end of the resistor R33 are both connected to an emitter of the transistor Q12, a base of the transistor Q12 is connected to a cathode of the diode D8, and a collector of the transistor Q12 is also used as a second input terminal of the driving unit 152.
The other terminal of the capacitor C15 is connected to ground.
The other end of the resistor R34 is connected to one end of the resistor R35 and serves as the output terminal of the driving unit 152, and the other end of the resistor R35 is grounded.
For example, the number of the driving circuits included in the driving unit may be selected according to the number of the switching tubes in the dimming control unit, as shown in fig. 14, if two switching tubes are included in the dimming control unit, one driving circuit and a peripheral circuit may be selected to drive the two switching tubes in the dimming control unit. As shown in fig. 15, if the dimming control unit includes three switching tubes, the three driving circuits can be selected to drive the three switching tubes in the dimming control unit respectively, so as to provide a suitable voltage for the dimming control unit to implement dimming control.
Optionally, referring to fig. 16, the dimming circuit may further include an over-temperature protection module, where the over-temperature protection module is configured to detect a temperature of a switching tube in the dimming module, and when the temperature rises to a set threshold, output an OTD signal to the control module to control and implement automatic cut-off of dimming output, implement an over-temperature protection function, and avoid danger such as fire, explosion, or smoke in the dimming circuit.
Optionally, referring to fig. 17, the dimming circuit may further include an overcurrent detection module, where the overcurrent detection module is configured to detect a current of a main circuit of a switching tube in the dimming module, and the overcurrent detection module may be connected to the sources of the switching tubes Q6, Q7, and Q8 through a resistor, or connected to the sources of the switching tubes Q3 and Q4 through a resistor, detect an over load current, and output an IPEAK _ DET signal to the control module to control and realize automatic cut-off of the dimming output if the over load current reaches a set threshold value.
Optionally, referring to fig. 18, the dimming circuit may further include a Radio Frequency (RF) module, and the RF module may adopt communication protocols such as ZIGBEE, BLE, 433MHz, LoRa, and Z-wave, and may implement remote control through a gateway, a cloud platform, and a mobile APP.
Optionally, referring to fig. 19 and 20, the dimming circuit may further include a dimming/switching button and a reset button, and cooperate with the RF module to perform dimming, switching and resetting functions.
Optionally, referring to fig. 21 and 22, the dimming circuit may further include a power failure detection module and a load type detection module, and the power failure detection module and the load type detection module cooperate with the control module to implement power failure detection and load type detection.
As still another embodiment of the present invention, the present invention further includes a dimming device including the dimming circuit of any of the above embodiments, and having the same advantageous effects as the dimming circuit of any of the above embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A dimming circuit, comprising: the device comprises a power taking module, a zero-crossing detection module, a voltage conversion module, a control module and a dimming module;
the first input end of the power taking module is used for being connected with a live wire, the second input end of the power taking module is used for being connected with a zero wire, the third input end of the power taking module is connected with the first output end of the dimming module, the fourth input end of the power taking module is connected with the second output end of the dimming module, the first output end of the power taking module is respectively connected with the first input end of the zero-crossing detection module and the first input end of the dimming module, and the second output end of the power taking module is connected with the first input end of the voltage conversion module;
the second input end of the zero-crossing detection module is used for being connected with a zero line, the third input end of the zero-crossing detection module is connected with the first output end of the dimming module, the fourth input end of the zero-crossing detection module is connected with the second output end of the dimming module, the fifth input end of the zero-crossing detection module is connected with the first output end of the voltage conversion module, and the output end of the zero-crossing detection module is connected with the first input end of the control module;
a second output end of the voltage conversion module is connected with a second input end of the control module, and a third output end of the voltage conversion module is connected with a third input end of the dimming module;
the output end of the control module is connected with the second input end of the dimming module;
the first output end of the dimming module is used for being connected with one end of an external lamp or a mechanical switch, and the second output end of the dimming module is suspended or used for being connected with one end of the rebound switch or the other end of the mechanical switch.
2. The dimming circuit of claim 1, wherein the zero-crossing detection module comprises: the device comprises a first detection unit, a second detection unit, a third detection unit and a fourth detection unit;
the first input end of the first detection unit, the first input end of the second detection unit, the first input end of the third detection unit and the first input end of the fourth detection unit are jointly used as a fifth input end of the zero-crossing detection module;
a second input end of the first detection unit is used as a first input end of the zero-crossing detection module, a second input end of the second detection unit is used as a second input end of the zero-crossing detection module, a second input end of the third detection unit is used as a third input end of the zero-crossing detection module, and a second input end of the fourth detection unit is used as a fourth input end of the zero-crossing detection module;
the output end of the first detection unit, the output end of the second detection unit, the output end of the third detection unit and the output end of the fourth detection unit are jointly used as the output end of the zero-crossing detection module.
3. The dimming circuit of claim 2, wherein the first detection unit comprises: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a diode D1, a diode D2, a capacitor C1, a capacitor C2, a capacitor C3 and a comparator chip U1;
one end of the resistor R1 is used as a second input end of the first detection unit, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is respectively connected with the anode of the diode D1, the cathode of the diode D2 and one end of the resistor R3, and the other end of the resistor R3 is respectively connected with one end of the capacitor C1 and the non-inverting input end of the comparator chip U1;
the cathode of the diode D1 and the anode of the diode D2 are both connected with one end of the resistor R4 and then grounded, the anode of the diode D2 is also connected with the other end of the capacitor C1, and the other end of the resistor R4 is connected with the inverting input end of the comparator chip U1;
the ground terminal of the comparator chip U1 is grounded, the power terminal of the comparator chip U1 is used as the first input terminal of the first detection unit, and the power terminal of the comparator chip U1 is also grounded after being connected in series with the capacitor C2;
the output end of the comparator chip U1 is connected with one end of the resistor R5, the other end of the resistor R5 is used as the output end of the first detection unit, and the other end of the resistor R5 is connected with the capacitor C3 in series and then grounded.
4. The dimming circuit of claim 2, wherein the second detection unit comprises: the circuit comprises a resistor R6, a resistor R7, a resistor R8, a resistor R9, a diode D3 and a capacitor C4;
one end of the resistor R6 is used as a second input end of the second detection unit, and the other end of the resistor R6 is connected with the resistor R7 and the resistor R8 in series and then grounded;
the connection ends of the resistor R7 and the resistor R8 are respectively connected with the anode of the diode D3 and one end of the resistor R9;
the cathode of the diode D3 is used as a first input end of the second detection unit;
the other end of the resistor R9 is used as the output end of the second detection unit, and the other end of the resistor R9 is connected in series with the capacitor C4 and then grounded.
5. The dimming circuit according to claim 2, wherein the third detection unit and the fourth detection unit have the same circuit structure;
the third detection unit includes: the circuit comprises a resistor R10, a resistor R11, a resistor R12, a resistor R13, a diode D4, a capacitor C5, a capacitor C6 and a switching tube Q1;
one end of the resistor R10 is used as a second input end of the third detection unit, the other end of the resistor R10 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to the anode of the diode D4, and the cathode of the diode D4 is connected to one end of the resistor R12, one end of the capacitor C5 and the gate of the switching tube Q1, respectively;
the other end of the resistor R12, the other end of the capacitor C5, the source of the switch tube Q1 and one end of the capacitor C6 are connected and then grounded;
the other end of the capacitor C6 is used as the output end of the third detection unit, and the other end of the capacitor C6 is further connected with the drain of the switching tube Q1;
the drain of the switching tube Q1 is also connected in series with the resistor R13 to serve as the first input terminal of the third detecting unit.
6. The dimming circuit according to any one of claims 1 to 5, wherein the dimming module comprises: a dimming control unit and a driving unit;
a first input end of the dimming control unit is used as a first input end of the dimming module, a second input end of the dimming control unit is connected with an output end of the driving unit, a first output end of the dimming control unit is used as a first output end of the dimming module, and a second output end of the dimming control unit is used as a second output end of the dimming module;
the first input end of the driving unit is used as the second input end of the dimming module, and the second input end of the driving unit is used as the third input end of the dimming module.
7. The dimming circuit of claim 6, wherein the dimming control unit further comprises a third input terminal and a fourth input terminal, the third input terminal of the dimming control unit is connected to the fourth output terminal of the voltage conversion module, and the fourth input terminal of the dimming control unit is connected to the second output terminal of the control module;
the dimming control unit includes: the circuit comprises a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a diode D6, a capacitor C9, a capacitor C10, a capacitor C11, a switch tube Q3, a switch tube Q4, a triode Q5 and a single-pole double-throw relay K1;
the drain of the switching tube Q3 is used as a first input end of the dimming control unit, and the drain of the switching tube Q3 is connected with the gate of the switching tube Q3 after being connected with the capacitor C9 and the resistor R18 in series;
the source of the switching tube Q3 is connected to one end of the resistor R19 and then grounded, the other end of the resistor R19 is connected to the source of the switching tube Q4, the drain of the switching tube Q4 is connected to the gate of the switching tube Q4 after being connected in series with the capacitor C10 and the resistor R20, and the gate of the switching tube Q3 and the gate of the switching tube Q4 are both used as second input ends of the dimming control unit;
the drain of the switching tube Q4 is further connected to a common contact of the single-pole double-throw relay K1, a normally closed contact of the single-pole double-throw relay K1 serves as a first output end of the dimming control unit, a normally open contact of the single-pole double-throw relay K1 serves as a second output end of the dimming control unit, a first coil terminal of the single-pole double-throw relay K1 is connected to an anode of the diode D6 and a collector of the triode Q5, and a cathode of the diode D6 is connected to a second coil terminal of the single-pole double-throw relay K1 and serves as a third input end of the dimming control unit;
the base electrode of the triode Q5 is connected with one end of the capacitor C11 and one end of the resistor R22, respectively, the other end of the resistor R22 is used as the fourth input end of the dimming control unit, the other end of the resistor R22 is further connected with one end of the resistor R21, and the other end of the resistor R21 is connected with the other end of the capacitor C11 and the emitter of the triode Q5 and then grounded.
8. The dimming circuit of claim 6, wherein the dimming control unit comprises: a resistor R23, a resistor R24, a resistor R25, a resistor R26, a capacitor C12, a capacitor C13, a capacitor C14, a switching tube Q6, a switching tube Q7 and a switching tube Q8;
the drain of the switching tube Q6 is used as a first input end of the dimming control unit, and the drain of the switching tube Q6 is connected with the gate of the switching tube Q6 after being connected with the capacitor C12 and the resistor R23 in series;
the source of the switching tube Q6 is connected to one end of the resistor R24 and then grounded, the other end of the resistor R24 is connected to the source of the switching tube Q7 and the source of the switching tube Q8, respectively, the drain of the switching tube Q7 is used as the first output end of the dimming control unit, and the drain of the switching tube Q7 is connected to the gate of the switching tube Q7 after being connected in series with the capacitor C13 and the resistor R25;
the drain of the switching tube Q8 is used as the second output end of the dimming control unit, and the drain of the switching tube Q8 is connected with the gate of the switching tube Q8 after being connected with the capacitor C14 and the resistor R26 in series;
the gate of the switching tube Q6, the gate of the switching tube Q7 and the gate of the switching tube Q8 are all used as the second input end of the dimming control unit.
9. The dimming circuit of claim 6, wherein the driving unit comprises at least one driving circuit;
the driving circuit includes: the circuit comprises a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a resistor R34, a resistor R35, a diode D7, a diode D8, a diode D9, a diode D10, a capacitor C15, a triode Q9, a triode Q10, a triode Q11 and a triode Q12;
one end of the resistor R27 is used as a first input end of the driving unit, the other end of the resistor R27 is respectively connected with one end of the resistor R28 and the base of the transistor Q9, and the other end of the resistor R28, the emitter of the transistor Q9 and one end of the resistor R29 are grounded after being connected;
a collector of the triode Q9 is connected with one end of the resistor R30, the other end of the resistor R30 is respectively connected with a base of the triode Q10 and one end of the resistor R31, and the other end of the resistor R31 is connected with an emitter of the triode Q10 and then serves as a second input end of the driving unit;
the collector of the triode Q10 is connected with the other end of the resistor R29 and then is respectively connected with the cathode of the diode D7 and the anode of the diode D8, the anode of the diode D7 is connected with the base of the triode Q11, and the collector of the triode Q11 is grounded;
an emitter of the transistor Q11 is connected to an anode of the diode D9 and one end of the resistor R32, respectively, the other end of the resistor R32 is connected to one end of the resistor R33, a cathode of the diode D9, an anode of the diode D10, one end of the capacitor C15 and one end of the resistor R34, respectively, a cathode of the diode D10 and the other end of the resistor R33 are both connected to an emitter of the transistor Q12, a base of the transistor Q12 is connected to a cathode of the diode D8, and a collector of the transistor Q12 is also used as a second input terminal of the driving unit;
the other end of the capacitor C15 is grounded;
the other end of the resistor R34 is connected with one end of the resistor R35 to serve as the output end of the driving unit, and the other end of the resistor R35 is grounded.
10. A dimming device comprising a dimming circuit as claimed in any one of claims 1 to 9.
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