CN109922567B - Dimming circuit for realizing multiple dimming modes - Google Patents
Dimming circuit for realizing multiple dimming modes Download PDFInfo
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- CN109922567B CN109922567B CN201910194609.XA CN201910194609A CN109922567B CN 109922567 B CN109922567 B CN 109922567B CN 201910194609 A CN201910194609 A CN 201910194609A CN 109922567 B CN109922567 B CN 109922567B
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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
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- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention provides a dimming circuit for realizing multiple dimming modes, which comprises a wiring terminal CON1, a voltage dividing circuit, a first branch with a comparison device, a second branch with an amplifying device and a microprocessor U1, wherein the input end of the wiring terminal CON1 receives a dimming signal from a controller, and a voltage signal is generated between two output pins; the voltage dividing circuit divides the voltage signal and feeds the voltage signal back to the comparison device and the amplifying device; the first branch circuit compares the divided voltage signal with a preset reference voltage by using a comparison device to obtain a high-low level signal, so as to control a post-stage circuit to dim a dimming source according to the high-low level signal; the second branch circuit amplifies the partial pressure signal by using the amplifying device and outputs the partial pressure signal to the microprocessor U1, and the microprocessor U1 converts the amplified signal into a PWM signal so as to utilize the PWM signal to control the post-stage circuit to dim the dimming source. The scheme of the invention can effectively save the number of wiring terminals and circuit components.
Description
Technical Field
The invention relates to the technical field of illumination, in particular to a dimming circuit for realizing multiple dimming modes.
Background
In a traditional dimming ballast, a dimming LED driving circuit, a dimming power supply and the like which use at least two modes of DALI, 0-10V/1-10V, push dim/touch dim and the like for dimming, a separate wiring terminal and a corresponding matched circuit are required to be respectively arranged for each dimming mode to realize, so that the wiring complexity of the circuit can be increased, and the flexibility and the adaptability of the dimming circuit can be increased. Therefore, it is necessary to provide a dimming circuit capable of realizing a plurality of dimming modes more simply.
Disclosure of Invention
The present invention has been made in view of the above problems, and has as its object to provide a dimming circuit implementing a plurality of dimming modes that overcomes or at least partially solves the above problems.
According to an aspect of the present invention, there is provided a dimming circuit for implementing a plurality of dimming modes, characterized by comprising a connection terminal CON1, a voltage dividing circuit, a first branch having a comparing device, a second branch having an amplifying device and a microprocessor U1, wherein,
the connecting terminal CON1 is provided with an input end and an output end, wherein the input end is used for being connected with controllers in different dimming modes, the output end is provided with a first output pin and a second output pin, the input end receives a dimming signal from the controller, and a voltage signal is generated between the two output pins;
the voltage dividing circuit is connected with the output end of the connecting terminal CON1 and is configured to divide the voltage signal and then feed the divided voltage signal back to the comparison device and the amplifying device;
the first branch is configured to compare the divided voltage signal from the voltage dividing circuit with a preset reference voltage by using the comparison device to obtain a high-low level signal, so as to control the post-stage circuit to adjust the light of the light source according to the high-low level signal; and/or
The second branch circuit is configured to amplify the voltage division signal from the voltage division circuit by using the amplifying device and output the amplified signal to the microprocessor U1, and the microprocessor U1 converts the amplified signal into a PWM signal so as to control the post-stage circuit to dim the light source by using the PWM signal.
Optionally, the voltage dividing circuit comprises a first group of voltage dividing resistors connected with the first output pin, a second group of voltage dividing resistors connected with the second output pin, a voltage stabilizing tube D1 and a resistor R60 connected with the voltage stabilizing tube D1 in parallel, wherein,
the first component voltage resistor and the second component voltage resistor are connected in series, the connection point of the first component voltage resistor and the second component voltage resistor is connected with one end of the resistor R60, and the other end of the resistor R60 is grounded;
and the positive electrode of the voltage stabilizing tube D1 is grounded, and the negative electrode of the voltage stabilizing tube D is connected with one end of the resistor R60 and the integrated operational amplifier U2.
Optionally, the dimming mode controller includes any one of the following:
0-10V/1-10V dimming mode controller, push dim/touch dim dimming mode controller and DALI dimming mode controller.
Optionally, the comparing device includes a comparator, the amplifying device includes an amplifier, the comparator and the amplifier each have a non-inverting input end, a inverting input end and an output end, wherein the non-inverting input ends of the comparator and the amplifier are both connected with the voltage dividing circuit, the inverting input end of the comparator is used for inputting the preset reference voltage, and the output end of the amplifier is connected with the microprocessor U1;
the first branch is configured to receive a dimming signal from the push dim/touch dim dimming mode controller or the DALI dimming mode controller at the connection terminal CON1, divide the dimming signal by the voltage dividing circuit, compare the divided voltage signal with the preset reference voltage by using the comparator to obtain a high-low level signal, and output the high-low level signal through an output end of the comparator;
the second branch circuit is configured to receive the dimming signal from the 0-10V/1-10V dimming mode controller at the connection terminal CON1, and after the dimming signal is divided by the voltage dividing circuit, amplify the divided signal into a low-impedance voltage signal by using the amplifier, and output the low-impedance voltage signal to the microprocessor U1 through an output end of the amplifier.
Optionally, the comparator and the amplifier are integrated in the same chip to form an integrated op-amp U2.
Optionally, the second branch circuit further includes a first photoelectric coupler O1, having an input end and an output end, where the input end and the output end each include two pins, one pin is connected to the microprocessor U1, and the other pin is grounded; one pin of the output end is connected with a power supply, and the other pin of the output end is connected with the rear-stage circuit;
the microprocessor U1 is provided with an ADC pin and a PWM pin, the ADC pin is connected with the output end of the amplifier, the PWM pin is connected with one pin of the input end of the first photoelectric coupler O1, and the microprocessor U1 is configured to convert a voltage signal sampled by the ADC pin into a PWM signal and output the PWM signal to the rear-stage circuit through the PWM pin.
Optionally, the first branch further comprises a signal receiving circuit,
the signal receiving circuit comprises a second photoelectric coupler O2, a resistor R13 and a resistor R14 connected in series with the second photoelectric coupler O2, wherein one end of the resistor R13, which is not connected with the resistor R14, is connected with the output end of the comparator; the second photoelectric coupler O2 is provided with an input end and an output end, wherein the input end and the output end both comprise two pins, one pin is connected with a connection point of the resistor R13 and the resistor R14 in the input end, the other pin is grounded, and one pin is connected with the rear-stage circuit in the output end, and the other pin is grounded;
the signal receiving circuit is configured to control the on or off of the second photoelectric coupler O2 according to the high-low level signal output by the output end of the comparator so as to transmit a dimming signal to the rear-stage circuit.
Optionally, if the voltage signal between the two output pins of the connection terminal CON1 is greater than a specified voltage value, the divided voltage signal of the voltage dividing circuit is greater than the preset reference voltage, the output end of the comparator outputs a high level, the second photo coupler O2 is turned on, and the second photo coupler O2 is connected with the pin of the rear circuit to output a low level signal;
if the voltage signal between the two output pins of the connection terminal CON1 is smaller than the specified voltage value, the divided voltage signal of the voltage dividing circuit is smaller than the preset reference voltage, the output end of the comparator outputs a low level, the second photo coupler O2 is turned off, and the second photo coupler O2 is connected with the pin of the rear-stage circuit to output a high level signal.
Optionally, the first branch further comprises a signal transmitting circuit,
the signal transmitting circuit comprises a third photoelectric coupler O3, a resistor R4, a resistor R8 connected in series with the third photoelectric coupler, a switching element Q4 and a triode Q5, wherein,
the third photoelectric coupler O3 is provided with an input end and an output end, wherein the input end and the output end both comprise two pins, one pin is connected with a connection point of a resistor R4 and a resistor R8 in the input end, one end of the resistor R4, which is not connected with the resistor R8, is connected with the rear-stage circuit, the other pin is grounded, one pin is connected with the base electrode of a triode Q5 in the output end, and the other pin is connected with a power supply V1;
the switching element Q4 is respectively connected with the emitter of the triode Q5 and the voltage dividing circuit;
the signal transmitting circuit is configured to receive a high-low level feedback signal from the rear-stage circuit, and control the switching element Q4 to be turned on or off by using the feedback signal, so as to transmit the feedback signal to the DALI dimming mode controller by controlling the voltage value between two output pins of the connecting terminal CON 1.
Optionally, the signal transmitting circuit further comprises a resistor R6, a capacitor C3 and a resistor R11 which are sequentially connected in series;
the switching element Q4 comprises an MOS tube, the drain electrode of the MOS tube is connected with one end of the resistor R6, which is not connected with the capacitor C3, the grid electrode of the MOS tube is connected with the emitter electrode of the triode Q5, and the source electrode of the MOS tube is grounded.
Optionally, the post-stage circuit includes:
the singlechip is respectively connected with one pin in the output end of the first photoelectric coupler O1 and one pin in the output end of the second photoelectric coupler O2 in the signal receiving circuit;
the singlechip identifies a current dimming mode according to a PWM signal output by the first photoelectric coupler O1 and/or a high-low level signal from the second photoelectric coupler O2, and dims the source to be dimmed according to the current dimming mode.
Optionally, if the single-chip microcomputer detects that the voltage value corresponding to the PWM signal from the first photo coupler O1 is in the specified voltage range within the preset time period, it is identified that the current dimming mode is a 0-10V/1-10V dimming mode, and dimming is performed on the to-be-dimmed source according to the received PWM signal in the 0-10V/1-10V dimming mode.
Optionally, if the single-chip microcomputer detects that the high-low level signal from the second photoelectric coupler O2 accords with a preset DALI protocol, the current dimming mode is identified as a DALI dimming mode, and the source to be dimmed is dimmed according to the received high-low level signal in the DALI dimming mode.
Optionally, if the single-chip microcomputer detects that the high-low level signal from the second photoelectric coupler O2 accords with the waveform characteristic of the AC mains supply, the current dimming mode is identified as a push dim/touch dim dimming mode, and dimming is performed on the to-be-dimmed source according to the received high-low level signal in the push dim/touch dim dimming mode.
Optionally, one end of the resistor R4 in the signal transmitting circuit, which is not connected with the resistor R8, is connected with the singlechip and is configured to send out a high-low level feedback signal;
the signal transmitting circuit receives the feedback signal and feeds back the feedback signal to the DALI dimming mode controller.
Optionally, the method further comprises:
the protection circuit shares a switching element Q4 with the signal transmitting circuit, and also comprises a voltage stabilizing tube D3, a plurality of resistors connected in series and a triode Q6, wherein,
the voltage stabilizer D3 is provided with an anode and a cathode, the anode of the voltage stabilizer is connected with the base electrode of the triode Q6, the cathode of the voltage stabilizer is connected with the plurality of resistors connected in series, and the collector electrode of the triode Q6 is connected with the grid electrode of the switching element Q4;
if the voltage loaded on the voltage stabilizing tube D3 is greater than the voltage stabilizing value, the current on the voltage stabilizing tube flows through the resistors connected in series, the voltage stabilizing tube D3 and the base electrode of the triode Q6, the triode Q6 is controlled to be conducted, the switching element Q4 is further controlled to be turned off, and overvoltage protection of the dimming circuit is achieved.
In the embodiment of the invention, the dimming controllers with different dimming modes share one wiring terminal and corresponding matched circuits (such as a voltage division circuit, an integrated operational amplifier and the like), so that the dimming signal signals sent by the different dimming controllers are correspondingly processed by the same wiring terminal and the corresponding matched circuits, and the processed signals are used for controlling the rear-stage circuit to realize the dimming of the light source to be modulated, thereby not only saving the number of wiring terminals and circuit components, but also effectively reducing the wiring complexity of the dimming circuit and increasing the flexibility and adaptability of the dimming circuit.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a schematic diagram of a dimming circuit for implementing multiple dimming modes according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to solve the technical problems, the embodiment of the invention provides a dimming circuit for realizing a plurality of dimming modes. Fig. 1 is a schematic diagram of a dimming circuit for implementing multiple dimming modes according to an embodiment of the present invention. Referring to fig. 1, the dimming circuit includes a connection terminal CON1, a voltage dividing circuit 11, a first branch having a comparison device A1, a second branch having an amplifying device A2 and a microprocessor U1. The comparing device A1 and the amplifying device A2 in the embodiment shown in fig. 1 are integrated in the same chip to form the integrated op-amp U2 shown in fig. 1, however, the comparing device A1 and the amplifying device A2 may not be integrated in the same chip, which is not limited in the embodiment of the present invention.
The connection terminal CON1 has an input (not shown in the figure) for connecting to a controller (not shown in the figure) of different dimming modes, and an output having a first output pin 1 and a second output pin 2, the input receiving a dimming signal from the controller, a voltage signal being generated between the two output pins.
The voltage dividing circuit 11 is connected with the output end of the connecting terminal CON1, and can divide the voltage signals of the two output pins of the connecting terminal CON1 and feed the divided voltage signals back to the integrated operational amplifier U2.
The first branch circuit may compare the divided voltage signal from the voltage dividing circuit 11 with a preset reference voltage by using the comparing device A1 to obtain a high-low level signal, so as to control the post-stage circuit to dim the dimming source according to the high-low level signal.
The second branch may amplify the divided signal from the voltage division circuit 11 with the amplifying device A2 and output the amplified signal to the microprocessor U1, and then the microprocessor U1 converts the amplified signal into a PWM signal, so as to control a post-stage circuit (not shown in the figure) to dim the dimming source with the PWM signal. The microprocessor U1 may be a single chip microcomputer, or may be other types of control ICs, which is not specifically limited in the embodiment of the present invention.
According to the embodiment of the invention, the dimming controllers with different dimming modes share one wiring terminal and corresponding matched circuits (such as the voltage division circuit 11 and the integrated operational amplifier U2), so that the dimming signal signals sent by the different dimming controllers are correspondingly processed by the same wiring terminal and the corresponding matched circuits, and the processed signals are used for controlling the rear-stage circuit to realize dimming of the light source to be modulated, so that the number of wiring terminals and circuit components is saved, the wiring complexity of the dimming circuit is effectively reduced, and the flexibility and adaptability of the dimming circuit are improved.
In an embodiment of the present invention, the dimming mode controller may include any one of a 0-10V/1-10V dimming mode controller, a push dim/touch dim dimming mode controller, a DALI (Digital Addressable Lighting Interface) dimming mode controller, and the like.
The 0-10V/1-10V dimming mode controller may be one controller having two dimming modes, i.e., the controller has a 0-10V dimming mode and a 1-10V dimming mode, or may be two controllers, and each controller has either dimming mode. The dimming control principle is the same whether the controller has two dimming modes or one dimming mode.
For example, the controller has a dimming mode of 0-10V, the light source to be dimmed is not bright at 0V, the brightness of the light source to be dimmed is gradually bright when 0V is gradually increased to 10V, and the light source to be dimmed reaches the maximum brightness when 10V. For another example, the controller has a 1-10V dimming mode, the light source device is darkest at 1V, the brightness of the source to be dimmed gradually becomes bright when 1V is gradually increased to 10V, and the source to be dimmed reaches the maximum brightness when 10V.
The push dim/touch dim dimming mode controller may actually be a common self-recovery switch, and usually supports short-press to realize on or off of the light source to be dimmed, and long-press to realize the dimming function of the light source to be dimmed.
The DALI dimming mode controller sends a dimming signal through a DALI protocol to realize dimming of a light source to be dimmed.
Referring to fig. 1, in an embodiment of the present invention, the voltage dividing circuit 11 includes a first set of voltage dividing resistors (such as resistors R30, R31, and R32 in fig. 1) connected to the first output pin 1, a second set of voltage dividing resistors (such as resistors R40, R41, and R42 in fig. 1) connected to the second output pin 2, a voltage stabilizing tube D1, and a resistor R60 connected in parallel to the voltage stabilizing tube D1.
After the first component voltage-dividing resistor and the second component voltage-dividing resistor are connected, the connection point of the first component voltage-dividing resistor and the second component voltage-dividing resistor is connected with one end of a resistor R60, and the other end of the resistor R60 is grounded. The positive electrode of the voltage stabilizing tube D1 is grounded, and the negative electrode is connected with one end of the resistor R60 and the integrated operational amplifier U2. The voltage stabilizing tube D1 can effectively avoid the damage of the post-stage circuit caused by high voltage when the connecting terminal CON1 is connected with the AC mains supply. In this embodiment, the sum of the resistance values of the resistors R30, R31, R32 is equal to the sum of the resistance values of the resistors R40, R41, R42, so that the connection terminal CON1 can be ensured to be safely operated when the AC mains is connected.
In an embodiment of the invention, the comparing device A1 comprises a comparator and the amplifying device A2 comprises an amplifier, the comparator and the amplifier are integrated in the integrated op-amp U2 in the embodiment shown in fig. 1, and the comparator and the amplifier each have a non-inverting input terminal, an inverting input terminal and an output terminal. In the integrated operational amplifier U2 shown in fig. 1, the in-phase input end of the comparator is 3 pins, the reverse input end is 2 pins, the output end is 1 pin, the in-phase input end of the amplifier is 5 pins, the reverse input end is 6 pins, and the output end is 7 pins.
The non-inverting input ends of the comparator and the amplifier are both connected with the cathode of the voltage stabilizing tube D1 in the voltage dividing circuit 11.
The reverse input end of the comparator is used for inputting a preset reference voltage, the first branch circuit can receive a dimming signal from the push dim/touch dim dimming mode controller or the DALI dimming mode controller at the connecting terminal CON1, and after the dimming signal is divided by the voltage dividing circuit 11, the divided signal is compared with the preset reference voltage by the comparator to obtain a high-low level signal, and the high-low level signal is output through the output end of the comparator. It should be noted that, if the connection terminal CON1 receives the dimming signal from the 0-10V/1-10V dimming mode controller, and the dimming signal is divided by the voltage dividing circuit 11, the divided signal will also enter the comparator to be compared with the preset reference voltage, but the voltage signal output by the output end of the comparator will not affect the later stage circuit at this time, and the voltage signal output by the comparator can be directly ignored.
In an alternative embodiment, the dimming circuit further comprises a resistor R33 and a resistor R34 connected in series therewith, and the inverting input of the comparator is connected to the junction of the resistor R33 and the resistor R34. One end of the resistor R33, which is not connected with the resistor R34, is connected with the power supply VDD. The preset reference voltage is set by selecting a resistor R33 of a corresponding resistance value and a resistor R34 connected in series therewith.
The output end of the amplifier is connected with the microprocessor U1, the second branch circuit can receive the dimming signal from the 0-10V/1-10V dimming mode controller at the connecting terminal CON1, and after the dimming signal is divided by the voltage dividing circuit 11, the divided signal is amplified into a low-impedance voltage signal by the amplifier, and the low-impedance voltage signal is output to the microprocessor U1 through the output end of the amplifier. It should be noted that, if the connection terminal CON1 receives the dimming signal from the push dim/touch dim dimming mode controller or the DALI dimming mode controller, and the dimming signal is divided by the voltage dividing circuit 11, the divided signal will enter the amplifier to be amplified, but the voltage signal output by the output end of the amplifier does not have the reference value, and the voltage signal output by the amplifier can be directly ignored. Because the dimming signal from the 0-10V/1-10V dimming mode controller is a continuous voltage signal, the microprocessor U1 can convert the voltage signal from the amplifier into a PWM signal. The dimming signal sent by the push dim/touch dim dimming mode controller or the DALI dimming mode controller is a pulse signal, for example, the push dim dimming mode controller sends the pulse signal when the switch is pressed, so the microprocessor U1 cannot continuously generate the PWM signal under the condition.
In an alternative embodiment, the dimming circuit further comprises a resistor R43, a resistor R44 connected in series with the resistor R43, a resistor R45, and a capacitor C20 connected in series with the resistor R45. The reverse input end of the comparator is connected with the connection point of the resistor R33 and the resistor R34, one end of the resistor R34 which is not connected with the resistor R33 is grounded, and the output end of the amplifier is sequentially connected with the resistor R45 and the capacitor C20 so as to output a low-impedance voltage signal to the microprocessor U1 after RC filtering.
In an embodiment of the present invention, the second branch of the dimming circuit further includes a first photo coupler O1 having an input end and an output end, where the input end and the output end each include two pins, and the microprocessor U1 has an ADC pin and a PWM pin. One pin (namely the 1 pin of the first photoelectric coupler O1) of the input end of the first photoelectric coupler O1 is connected with the PWM pin of the microprocessor U1 through a resistor R46, and the other pin (namely the 2 pin of the first photoelectric coupler O1) is grounded; one pin (namely the 4 pin of the first photoelectric coupler O1) is connected with a power supply VCC, and the other pin (namely the 3 pin of the first photoelectric coupler O1) is connected with a post-stage circuit and a resistor R12.
The ADC pin of the microprocessor U1 is connected with the output end of the amplifier, and the microprocessor U1 converts the voltage signal sampled by the ADC pin into a PWM signal and outputs the PWM signal to a post-stage circuit through the PWM pin. The post-stage circuit may then convert the PWM signal back to a smoothed voltage signal.
In an embodiment of the present invention, the first branch of the dimming circuit further includes a signal receiving circuit 12, where the signal receiving circuit includes a second photo coupler O2, a resistor R13 and a resistor R14 connected in series therewith, and a resistor R15, where an end of the resistor R13 not connected to the resistor R14 is connected to an output end of the comparator. The second optocoupler O2 has an input end and an output end, wherein the input end and the output end both include two pins, one pin (i.e., 1 pin of the second optocoupler O2) of the input end is connected to a connection point between the resistor R13 and the resistor R14, the other pin (i.e., 2 pin of the second optocoupler O2) of the input end is grounded, one pin (i.e., 4 pin of the second optocoupler O2) of the output end is connected to a back-end circuit and the resistor R15, and the other pin (i.e., 3 pin of the second optocoupler O2) of the output end is grounded.
When the dimming signal is a push dim/touch dim dimming signal or a DALI dimming signal, the output end of the comparator outputs a high-low level signal to the signal receiving circuit 12, and the signal receiving circuit 12 controls the on or off of the second photo coupler O2 according to the high-low level signal, so that the dimming signal is transmitted to the post-stage circuit in a high-low level mode.
For example, if the dimming signal is a push dim/touch dim dimming signal or a DALI dimming signal, when the voltage signal between the two output pins of the connection terminal CON1 is greater than the specified voltage value, the voltage division signal of the voltage division circuit 11 is greater than the voltage division on the resistor R34, the output end of the comparator outputs a high level, the second photo coupler O2 is turned on, and the 4 pin of the second photo coupler O2 outputs a low level signal, that is, the RX end outputs a low level signal.
When the voltage signal between the two output pins of the connection terminal CON1 is smaller than the specified voltage value, the voltage division signal of the voltage division circuit 11 is smaller than the voltage division on the resistor R34, the output end of the comparator outputs a low level, the second photo coupler O2 turns off the 4 pin of the second photo coupler O2 to output a high level signal, that is, the RX end outputs a high level signal. The specified voltage value may be set according to actual requirements, for example, the specified voltage value may be 8V.
In an embodiment of the present invention, the first branch of the dimming circuit may further include a signal transmitting circuit 13, where the signal transmitting circuit 13 includes a third photo coupler O3, a resistor R4, a resistor R8 connected in series therewith, a switching element Q4, a triode Q5, a zener diode D5, and a resistor R18.
The third optocoupler O3 has an input end and an output end, wherein the input end and the output end both comprise two pins, one pin (i.e., 1 pin of the third optocoupler O3) is connected with a connection point of the resistor R4 and the resistor R8, the other end of the resistor R4 is connected with a later-stage circuit (i.e., TX end in fig. 1) and the other pin (i.e., 2 pin of the third optocoupler O3) is grounded, and one pin (i.e., 3 pin of the third optocoupler O3) is connected with the base electrode of the triode Q5 and the other pin (i.e., 4 pin of the third optocoupler O3) is connected with the power supply V1. The switching element Q4 is connected to the emitter of the transistor Q5 and the voltage divider circuit 11.
When the latter circuit receives the dimming signal, feedback may also be provided to the dimming controller, such as by sending a feedback signal to the dimming controller via the signal transmitting circuit 13.
For example, the dimming signal received by the post-stage circuit is a DALI dimming signal, and the signal transmitting circuit 13 may further receive a feedback signal with a high level and a low level from the post-stage circuit, and control the switching element Q4 to be turned on or off by using the feedback signal, so as to transmit the feedback signal to the DALI dimming mode controller by controlling the voltage value between the two output pins of the connection terminal CON 1.
When the TX end is at a high level, the third photo coupler O3 is turned on, and controls the switching element Q4 to be turned on, and the connection terminal CON1 is at a low level between the two output pins. When the TX end is at a low level, the third photo coupler O3 is turned off, and the switching element Q4 is controlled to be turned off, and the level between the two output pins of the connection terminal CON1 is changed back to a high level, thereby completing the signal transmission.
In this embodiment, the switching element Q4 may be a MOS transistor, and the signal transmitting circuit 13 further includes a resistor R6, a capacitor C3, a resistor R11, a resistor R20, a resistor R23, and a resistor R24, where the resistor R6, the capacitor C3, and the resistor R11 are sequentially connected in series, the resistor R23 and the resistor R24 are connected in parallel, one end of the resistor R23 is connected to the resistor R20, and the other end is grounded.
The drain electrode of the MOS tube is connected with one end of the resistor R6 which is not connected with the capacitor C3, the grid electrode is connected with the emitter electrode of the triode Q5 and one end of the resistor R11 which is not connected with the capacitor C3, and the source electrode is grounded through the resistor R24. And, the 3 pin of the third photoelectric coupler O3 is connected with the grid electrode of the MOS tube through the zener diode D5 and the resistor R18.
In the embodiment of the present invention, the dimming circuit further includes a rectifying circuit, such as a rectifying bridge DB1 in fig. 1, where an input end of the rectifying bridge DB1 is connected to an output end of the connecting terminal CON1, and two pins of the output end of the rectifying bridge DB1 are grounded and a drain electrode of the switching element Q4 respectively. The rectifier bridge DB1 may rectify a voltage signal generated between two output pins of the terminal CON 1.
In an embodiment of the present invention, the post-stage circuit may include a single chip microcomputer (not shown in the figure), where the single chip microcomputer is connected to the 3 pin of the first photocoupler O1 and the 4 pin of the second photocoupler O2 in the signal receiving circuit 12 respectively. The singlechip can identify the current dimming mode according to the PWM signal output by the first photoelectric coupler O1 and/or the high-low level signal from the second photoelectric coupler O2, and dim the dimming source according to the current dimming mode.
In the embodiment of the invention, the dimming circuit is correspondingly applied to different dimming controllers, such as a 0-10V/1-10V dimming mode controller, a push dim/touch dim dimming mode controller and a DALI dimming mode controller, and can comprise a 0-10V/1-10V dimming mode, a push dim/touch dim dimming mode and a DALI dimming mode. The singlechip identifies the current dimming mode according to the received PWM signal and the high-low level signal, and switches the current working mode to the identified dimming mode, and the process of identifying the dimming mode by the singlechip is respectively described below.
For the 0-10V/1-10V dimming mode, if the singlechip detects that the voltage value corresponding to the PWM signal from the first photoelectric coupler O1 is in a specified voltage range within a preset time period, the current dimming mode can be identified as the 0-10V/1-10V dimming mode, and then the current dimming mode is switched to the 0-10V/1-10V dimming mode, so that the dimming of the to-be-dimmed source is performed according to the received PWM signal in the 0-10V/1-10V dimming mode. The brightness of the light source to be adjusted will follow the voltage signal change between the two output pins of the connection terminal CON1, for example, the larger the voltage value between the two output pins of the connection terminal CON1, the brighter the brightness of the light source to be adjusted.
In an alternative embodiment, in order to enhance the anti-interference capability of the singlechip for identifying the dimming mode, the singlechip may be further configured to determine that the current dimming mode is the 0-10V/1-10V dimming mode if no signal conforming to the DALI protocol is received or no level change occurs at the RX end within a longer time after the 0-10V/1-10V dimming mode is identified.
For the DALI dimming mode, if the singlechip detects that the high-low level signal from the second photoelectric coupler O2 accords with a preset DALI protocol, the current dimming mode can be identified as the DALI dimming mode, and then the current dimming mode is switched to the DALI dimming mode, so that the dimming source is dimmed according to the received high-low level signal in the DALI dimming mode.
For the push dim/touch dim dimming mode, if the singlechip detects that the high-low level signal from the second photoelectric coupler O2 accords with the waveform characteristics of the AC mains supply, the current dimming mode can be identified as the push dim/touch dim dimming mode, and then the current dimming mode is switched to the push dim/touch dim dimming mode, so that the dimming is carried out on the dimming source to be dimmed according to the received high-low level signal in the push dim/touch dim dimming mode.
In addition, the singlechip can also judge the duration of the high-low level signal from the second photoelectric coupler O2 conforming to the waveform characteristics of the AC mains supply, if the duration is longer than the preset duration, the brightness of the source to be dimmed is adjusted, and if the duration is shorter than the preset duration, the source to be dimmed is subjected to switch control. For example, assuming that the preset duration is 5 seconds, if the duration of the high-low level signal conforming to the waveform characteristic of the AC mains supply is greater than 5 seconds, it may be determined that the push dim/touch dim dimming mode controller (such as a self-recovery switch) is triggered to perform a long-press action, and thus the dimming function is achieved, and if the duration of the high-low level signal is less than 5 seconds, it is determined that the push dim/touch dim dimming mode controller (such as a self-recovery switch) is triggered to perform a short-press action, and thus the switching function is achieved.
In an embodiment of the present invention, after the dimming mode is switched, the singlechip may further store the current dimming mode after the switching in the nonvolatile memory, so as to continue to work in the stored dimming mode when the dimming circuit is powered off and powered on again next time.
In an embodiment of the present invention, a power driving circuit (not shown in the figure) connected to the singlechip is further provided in the post-stage circuit, and the singlechip uses the received PWM signal and/or the high-low level signal to control the output of the power driving circuit, so as to dim the light source to be dimmed through the driving circuit.
In addition, the singlechip is also connected with one end of a resistor R4 in the signal transmitting circuit 13, which is not connected with a resistor R8, and after the singlechip sends out high-low level feedback signals, the feedback signals are fed back to the DALI dimming mode controller through the signal transmitting circuit 13.
With continued reference to fig. 1, in an embodiment of the present invention, in order to implement overvoltage protection for a dimming circuit, the dimming circuit may further include a protection circuit, and in order to save components, the protection circuit shares a switching element Q4 with the signal transmitting circuit 13, and further includes a voltage regulator D3, a plurality of resistors connected in series (such as resistors R2, R5, and R7 in fig. 1), and a triode Q6.
The voltage regulator tube D3 has an anode and a cathode, the anode is connected with the base electrode of the triode Q6, the cathode is connected with the resistor R7, and the collector electrode of the triode Q6 is connected with the grid electrode of the switching element Q4. If the voltage loaded on the voltage stabilizing tube D3 is larger than the voltage stabilizing value, the current on the voltage stabilizing tube flows through a plurality of resistors connected in series, the voltage stabilizing tube D3 and the base electrode of the triode Q6, the triode Q6 is controlled to be conducted, the switching element Q4 is further controlled to be turned off, and overvoltage protection of the dimming circuit is achieved.
In an alternative embodiment, a voltage stabilizing tube D4 may be connected between the gate of the switching element Q4 in the protection circuit and ground, where the negative electrode of the voltage stabilizing tube D4 is connected to the switching element Q4 and the positive electrode is grounded. The voltage regulator D4 is provided to avoid the gate voltage of the switching element Q4 from being too high to prevent the switching element Q4 from being burned out. To further avoid the gate voltage of the switching element Q4 from being too high, R21 may be further provided between the 3 pin of the third photo coupler O3 and ground to reduce the voltage value on the gate of the switching element Q4.
In an embodiment of the invention, a voltage stabilizing tube D6 may be connected in series between the gate of the MOS tube Q6 and the ground, the positive electrode of the voltage stabilizing tube D6 is connected to the gate of the MOS tube Q6, the negative electrode is grounded, and the arrangement of the voltage stabilizing tube D6 can effectively prevent the gate voltage of the MOS tube Q6 from being too high, i.e. prevent the MOS tube Q6 from being damaged. In this embodiment, after the second photo-coupler U2 is turned off, in order to further avoid the excessive voltage on the gate of the MOS transistor Q6, a resistor R27 may be further connected in series between the 3 pin of the second photo-coupler U2 and the ground terminal, so as to reduce the voltage value on the gate of the MOS transistor Q6.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the 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 scheme described in the foregoing embodiments can be modified or some or all technical features thereof can be replaced by others within the spirit and principle of the present invention; such modifications and substitutions do not depart from the scope of the invention.
Claims (14)
1. A dimming circuit for realizing a plurality of dimming modes is characterized by comprising a connecting terminal CON1, a voltage dividing circuit, a first branch circuit with a comparison device, a second branch circuit with an amplifying device and a microprocessor U1, wherein,
the connecting terminal CON1 is provided with an input end and an output end, wherein the input end is used for being connected with controllers in different dimming modes, the output end is provided with a first output pin and a second output pin, the input end receives a dimming signal from the controller, and a voltage signal is generated between the two output pins;
the voltage dividing circuit is connected with the output end of the connecting terminal CON1 and is configured to divide the voltage signal and then feed the divided voltage signal back to the comparison device and the amplifying device;
the first branch is configured to compare the divided voltage signal from the voltage dividing circuit with a preset reference voltage by using the comparison device to obtain a high-low level signal, so as to control the post-stage circuit to adjust the light of the light source according to the high-low level signal;
the second branch is configured to amplify the voltage division signal from the voltage division circuit by using the amplifying device and output the amplified signal to the microprocessor U1, and the microprocessor U1 converts the amplified signal into a PWM signal so as to control a post-stage circuit to dim a dimming source by using the PWM signal;
wherein, the dimming mode controller comprises any one of the following:
0-10V/1-10V dimming mode controller, push dim/touch dim dimming mode controller and DALI dimming mode controller;
the comparison device comprises a comparator, the amplification device comprises an amplifier, the comparator and the amplifier are respectively provided with a non-inverting input end, an inverting input end and an output end, wherein the non-inverting input ends of the comparator and the amplifier are respectively connected with the voltage dividing circuit, the inverting input end of the comparator is used for inputting the preset reference voltage, and the output end of the amplifier is connected with the microprocessor U1;
the first branch is configured to receive a dimming signal from the push dim/touch dim dimming mode controller or the DALI dimming mode controller at the connection terminal CON1, divide the dimming signal by the voltage dividing circuit, compare the divided voltage signal with the preset reference voltage by using the comparator to obtain a high-low level signal, and output the high-low level signal through an output end of the comparator;
the second branch circuit is configured to receive the dimming signal from the 0-10V/1-10V dimming mode controller at the connection terminal CON1, and after the dimming signal is divided by the voltage dividing circuit, amplify the divided signal into a low-impedance voltage signal by using the amplifier, and output the low-impedance voltage signal to the microprocessor U1 through an output end of the amplifier.
2. The dimming circuit for implementing multiple dimming modes according to claim 1, wherein,
the voltage dividing circuit comprises a first group of voltage dividing resistors connected with the first output pin, a second group of voltage dividing resistors connected with the second output pin, a voltage stabilizing tube D1 and a resistor R60 connected with the voltage stabilizing tube D1 in parallel,
the first component voltage resistor and the second component voltage resistor are connected in series, the connection point of the first component voltage resistor and the second component voltage resistor is connected with one end of the resistor R60, and the other end of the resistor R60 is grounded;
and the positive electrode of the voltage stabilizing tube D1 is grounded, and the negative electrode of the voltage stabilizing tube D is connected with one end of the resistor R60 and the integrated operational amplifier U2.
3. The dimming circuit for implementing multiple dimming modes according to claim 1, wherein,
the comparator and the amplifier are integrated in the same chip to form an integrated operational amplifier U2.
4. The dimming circuit for implementing multiple dimming modes according to claim 1, wherein,
the second branch circuit also comprises a first photoelectric coupler O1, an input end and an output end, wherein the input end and the output end comprise two pins, one pin is connected with the microprocessor U1 in the input end, and the other pin is grounded; one pin of the output end is connected with a power supply, and the other pin of the output end is connected with the rear-stage circuit;
the microprocessor U1 is provided with an ADC pin and a PWM pin, the ADC pin is connected with the output end of the amplifier, the PWM pin is connected with one pin of the input end of the first photoelectric coupler O1, and the microprocessor U1 is configured to convert a voltage signal sampled by the ADC pin into a PWM signal and output the PWM signal to the rear-stage circuit through the PWM pin.
5. The dimming circuit for implementing multiple dimming modes according to claim 4, wherein the first branch further comprises a signal receiving circuit,
the signal receiving circuit comprises a second photoelectric coupler O2, a resistor R13 and a resistor R14 connected in series with the second photoelectric coupler O2, wherein one end of the resistor R13, which is not connected with the resistor R14, is connected with the output end of the comparator; the second photoelectric coupler O2 is provided with an input end and an output end, wherein the input end and the output end both comprise two pins, one pin is connected with a connection point of the resistor R13 and the resistor R14 in the input end, the other pin is grounded, and one pin is connected with the rear-stage circuit in the output end, and the other pin is grounded;
the signal receiving circuit is configured to control the on or off of the second photoelectric coupler O2 according to the high-low level signal output by the output end of the comparator so as to transmit a dimming signal to the rear-stage circuit.
6. The dimming circuit for implementing multiple dimming modes as claimed in claim 5, wherein,
if the voltage signal between the two output pins of the connection terminal CON1 is greater than a specified voltage value, the divided voltage signal of the voltage dividing circuit is greater than the preset reference voltage, the output end of the comparator outputs a high level, the second photoelectric coupler O2 is conducted, and the second photoelectric coupler O2 is connected with the pin of the rear-stage circuit to output a low level signal;
if the voltage signal between the two output pins of the connection terminal CON1 is smaller than the specified voltage value, the divided voltage signal of the voltage dividing circuit is smaller than the preset reference voltage, the output end of the comparator outputs a low level, the second photo coupler O2 is turned off, and the second photo coupler O2 is connected with the pin of the rear-stage circuit to output a high level signal.
7. The dimming circuit for implementing multiple dimming modes according to claim 5, wherein the first branch further comprises a signal transmitting circuit,
the signal transmitting circuit comprises a third photoelectric coupler O3, a resistor R4, a resistor R8 connected in series with the third photoelectric coupler, a switching element Q4 and a triode Q5, wherein,
the third photoelectric coupler O3 is provided with an input end and an output end, wherein the input end and the output end both comprise two pins, one pin is connected with a connection point of a resistor R4 and a resistor R8 in the input end, one end of the resistor R4, which is not connected with the resistor R8, is connected with the rear-stage circuit, the other pin is grounded, one pin is connected with the base electrode of a triode Q5 in the output end, and the other pin is connected with a power supply V1;
the switching element Q4 is respectively connected with the emitter of the triode Q5 and the voltage dividing circuit, and the collector of the triode Q5 is grounded;
the signal transmitting circuit is configured to receive a high-low level feedback signal from the rear-stage circuit, and control the switching element Q4 to be turned on or off by using the feedback signal, so as to transmit the feedback signal to the DALI dimming mode controller by controlling the voltage value between two output pins of the connecting terminal CON 1.
8. The dimming circuit for realizing multiple dimming modes according to claim 7, wherein the signal transmitting circuit further comprises a resistor R6, a capacitor C3 and a resistor R11 which are sequentially connected in series;
the switching element Q4 comprises an MOS tube, the drain electrode of the MOS tube is connected with one end of the resistor R6, which is not connected with the capacitor C3, the grid electrode of the MOS tube is connected with the emitter electrode of the triode Q5, and the source electrode of the MOS tube is grounded.
9. The dimming circuit for implementing multiple dimming modes as claimed in claim 7, wherein the post-stage circuit comprises:
the singlechip is respectively connected with one pin in the output end of the first photoelectric coupler O1 and one pin in the output end of the second photoelectric coupler O2 in the signal receiving circuit;
the singlechip identifies a current dimming mode according to a PWM signal output by the first photoelectric coupler O1 and/or a high-low level signal from the second photoelectric coupler O2, and dims the source to be dimmed according to the current dimming mode.
10. The dimming circuit for implementing multiple dimming modes as claimed in claim 9, wherein,
if the singlechip detects that the voltage value corresponding to the PWM signal from the first photoelectric coupler O1 is in a specified voltage range within a preset time period, the current dimming mode is identified as a 0-10V/1-10V dimming mode, and the dimming is carried out on the source to be dimmed according to the received PWM signal in the 0-10V/1-10V dimming mode.
11. The dimming circuit for implementing multiple dimming modes as claimed in claim 9, wherein,
if the singlechip detects that the high-low level signal from the second photoelectric coupler O2 accords with a preset DALI protocol, the current dimming mode is identified as a DALI dimming mode, and dimming is carried out on the source to be dimmed according to the received high-low level signal in the DALI dimming mode.
12. The dimming circuit for implementing multiple dimming modes as claimed in claim 9, wherein,
if the singlechip detects that the high-low level signal from the second photoelectric coupler O2 accords with the waveform characteristics of the AC mains supply, the current dimming mode is identified as a push dim/touch dim dimming mode, and the dimming is carried out on the source to be dimmed according to the received high-low level signal in the push dim/touch dim dimming mode.
13. The dimming circuit for implementing multiple dimming modes as claimed in claim 9, wherein,
one end of a resistor R4 in the signal transmitting circuit, which is not connected with a resistor R8, is connected with the singlechip and is configured to send out a high-low level feedback signal;
the signal transmitting circuit receives the feedback signal and feeds back the feedback signal to the DALI dimming mode controller.
14. The dimming circuit for implementing multiple dimming modes as recited in claim 8, further comprising:
the protection circuit shares a switching element Q4 with the signal transmitting circuit, and also comprises a voltage stabilizing tube D3, a plurality of resistors connected in series and a triode Q6, wherein,
the voltage stabilizer D3 is provided with an anode and a cathode, the anode of the voltage stabilizer is connected with the base electrode of the triode Q6, the cathode of the voltage stabilizer is connected with the plurality of resistors connected in series, and the collector electrode of the triode Q6 is connected with the grid electrode of the switching element Q4;
if the voltage loaded on the voltage stabilizing tube D3 is greater than the voltage stabilizing value, the current on the voltage stabilizing tube flows through the resistors connected in series, the voltage stabilizing tube D3 and the base electrode of the triode Q6, the triode Q6 is controlled to be conducted, the switching element Q4 is further controlled to be turned off, and overvoltage protection of the dimming circuit is achieved.
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| CN114423116B (en) * | 2022-03-29 | 2022-06-17 | 深圳市必易微电子股份有限公司 | Dimming control circuit, dimming control method and LED drive circuit |
| CN117641654A (en) * | 2024-01-25 | 2024-03-01 | 深圳市鸿远微思电子有限公司 | Intelligent dimming control circuit and method |
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