CN114423118B - Three-in-one dimming circuit and LED (light emitting diode) lighting system - Google Patents
Three-in-one dimming circuit and LED (light emitting diode) lighting system Download PDFInfo
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- CN114423118B CN114423118B CN202111648071.9A CN202111648071A CN114423118B CN 114423118 B CN114423118 B CN 114423118B CN 202111648071 A CN202111648071 A CN 202111648071A CN 114423118 B CN114423118 B CN 114423118B
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- 239000003990 capacitor Substances 0.000 claims description 25
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 19
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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Abstract
The invention relates to a three-in-one dimming circuit and an LED lighting system, wherein the three-in-one dimming circuit comprises a symmetrical constant current source unit, and the power output end of the three-in-one dimming circuit is connected with a dimming module; the first input end of the voltage following unit is connected with the dimming module; the second input end of the voltage following unit is connected to the output end of the voltage following unit, and the output end follows the voltage of the input end of the voltage following unit; the output end of the voltage following unit is connected with the signal conversion unit, and the input dimming signal passes through the voltage following unit in a voltage following mode and is output to the signal conversion unit; the signal conversion unit is used for performing signal processing on the input dimming signal and generating a dimming control signal which can act on the driving power supply module according to the input dimming signal; the voltage following unit is also used for isolating the input dimming signal from the signal conversion unit; the dimming precision and consistency of the dimming module can be ensured; while not consuming current in the dimming modules so that one dimming module can control more light source modules.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to a three-in-one dimming circuit and an LED lighting system.
Background
At present, an LED lamp is required to realize a dimming function, and a power supply output to a light source module is regulated through a dimming module; dimming modules are generally classified into three types, PWM dimmers, voltage dimmers, and adjustable resistance dimmers, respectively.
Many integrated dimming circuits exist in the market at present to meet the demands of different customers; however, many two-in-one dimming circuits only capable of realizing PWM and voltage cannot realize adjustable resistance dimming, so that real three-in-one dimming cannot be realized; even if three-in-one dimming can be realized, high-precision adjustment can be carried out only on a PWM (pulse-width modulation) dimmer and a voltage dimmer, so that the resistance dimming precision cannot be ensured, and the linearity is insufficient and the consistency is poor; there are also three-in-one dimming circuits, which, although guaranteeing the adjustment accuracy for PWM dimming, voltage dimming and adjustable resistance dimming, are prone to consume current in the three-in-one dimming circuit or in the dimming module, resulting in only a small number of fixtures being controlled when a customer uses one dimmer.
Disclosure of Invention
The invention aims to solve the technical problem of providing a three-in-one dimming circuit and an LED lighting system.
The technical scheme adopted for solving the technical problems is as follows: the three-in-one dimming circuit comprises a symmetrical constant current source unit, a first power supply output end and a second power supply output end, wherein the symmetrical constant current source unit is used for generating a constant current signal, and the power supply output end of the symmetrical constant current source unit is connected with the first end of a dimming module so as to output the constant current signal to the dimming module;
the first input end of the voltage following unit is connected with the first end of the dimming module to serve as a signal input front end to receive an input dimming signal generated by the dimming module; the second input end of the voltage following unit is connected to the output end of the voltage following unit, and the output end follows the voltage of the input end of the voltage following unit; the output end of the voltage following unit is connected with the signal conversion unit, and the input dimming signal passes through the voltage following unit in a voltage following mode and is output to the signal conversion unit;
the signal conversion unit is used for performing signal processing on the input dimming signal and generating a dimming control signal which can act on the driving power supply module according to the input dimming signal;
the voltage follower unit is also used for isolating the input dimming signal from the signal conversion unit.
Preferably, the dimming module comprises an adjustable resistance dimmer, a voltage dimmer or a PWM dimmer;
when the dimming module is an adjustable resistance dimmer, the symmetrical constant current source unit generates a constant current signal and provides working current for the dimming module, so that the dimming module generates and outputs an input dimming signal; the voltage following unit receives the input dimming signal, and the first input end of the voltage following unit is in a high-resistance state so as to prevent the constant current signal from flowing to the signal conversion unit;
when the dimming module is a voltage dimmer or a PWM dimmer, an input dimming signal generated by the dimming module is output to the signal conversion unit through the voltage following unit, and the voltage following unit isolates the input dimming signal from the signal conversion unit.
Preferably, the signal conversion unit includes a sawtooth wave generation unit for generating a sawtooth wave signal, a signal processing unit, and a signal output unit;
one end of the signal processing unit is connected with the output end of the voltage following unit and is used for performing signal processing on the input dimming signal;
the signal output unit is respectively connected with the other end of the signal processing unit and the sawtooth wave generating unit, and is used for receiving sawtooth wave signals and processed input dimming signals and generating the dimming control signals according to the sawtooth wave signals and the processed input dimming signals.
Preferably, the symmetrical constant current source unit comprises a ninth resistor R9, a third voltage stabilizing tube U3, a first triode Q1, a second triode Q2 with the same model as the first triode Q1, a first diode D1 and an eighth resistor R8;
the first end of the ninth resistor R9, the reference end of the third voltage stabilizing tube U3 and the cathode of the third voltage stabilizing tube U3 are commonly connected to the circuit power supply input end VCC; the second end of the ninth resistor R9 is connected with the emitter of the first triode Q1, the base electrode of the first triode Q1 is connected with the base electrode of the second triode Q2, and the collector electrode of the first triode Q1 is connected with the anode of the first diode D1; the cathode of the first diode D1 is connected with the first end of the dimming module; the positive pole of third surge tube U3 is connected the projecting pole of second triode Q2, the collecting electrode of second triode Q2 is connected its base and eighth resistance R8 first end, eighth resistance second end is connected first ground connection.
Preferably, the sawtooth wave generating unit comprises a sixth resistor R6, a seventh resistor R7, a fifth resistor R5, a unidirectional silicon controlled rectifier SCR1, a second capacitor C2 and a fourth resistor R4;
the first ends of the sixth resistor R6 and the seventh resistor R7 are commonly connected to the circuit power supply input end VCC; the second end of the sixth resistor R6 is connected with the first end of the fifth resistor R5, the first end of the second capacitor C2 and the first input end of the signal output unit; the second end of the fifth resistor R5 is connected with the anode of the unidirectional silicon controlled rectifier SCR 1; the second end of the seventh resistor R7 is connected with the control electrode of the unidirectional silicon controlled rectifier SCR1 and the first end of the fourth resistor R4; the cathode of the unidirectional silicon controlled rectifier SCR1, the second end of the second capacitor C2 and the second end of the fourth resistor R4 are connected with a first grounding end.
Preferably, the signal processing unit comprises a second resistor R2, a third resistor R3 and a first capacitor C1;
the second end of the third resistor R3 is connected with the output end of the voltage follower U2, and the first end of the third resistor R3 is connected with the first end of the first capacitor C1, the first end of the second resistor R2 and the second input end of the signal output unit; the second end of the second resistor R2 and the second end of the first capacitor C1 are connected with the first grounding end.
Preferably, the signal output unit includes a first comparator U1, a first resistor R1, and an optical coupler OT1;
the inverting input end of the first comparator U1 is connected to the output end of the sawtooth wave generation unit; the non-inverting input end of the first comparator U1 is connected with the output end of the voltage follower U2 through the signal processing unit; the output end of the first comparator U1 is connected with the second end of the first resistor R1, the first end of the first resistor R1 is connected with the first pin of the optical coupler OT1, the second pin of the optical coupler OT1 is connected with the first grounding end, the third pin of the optical coupler OT1 is connected with the second grounding end, and the fourth pin of the optical coupler OT1 is used as a signal output end.
Preferably, the signal conversion unit further comprises an MCU controller for managing and intelligently dimming.
Preferably, the slope of the sawtooth signal depends on the second capacitance C2; the magnitude of the on-voltage value of the unidirectional silicon controlled rectifier SCR1 is changed by controlling the resistance value of the seventh resistor R7 and/or the fourth resistor R4.
The invention also constructs an LED lighting system which comprises a plurality of light source modules and driving power supply modules, wherein each light source module is connected with the corresponding driving power supply module; the three-in-one dimming circuit also comprises a dimming module and a plurality of three-in-one dimming circuits; one end of each three-in-one dimming circuit is connected with the dimming module, and the other end of each three-in-one dimming circuit is respectively connected with the corresponding driving power supply module.
The implementation of the invention has the following beneficial effects: by setting a voltage follower as a signal input front end, an input dimming signal output by a dimming module is isolated from an internal circuit of the three-in-one dimming circuit, and three-in-one dimming can be realized by matching with a symmetrical constant current source unit, so that the dimming precision and consistency of the dimming module are ensured; meanwhile, the current in the dimming module is not consumed, the dimming precision can be further improved, and meanwhile, one dimming module can control a plurality of light source modules, so that the cost is saved for a user.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic circuit diagram of a three-in-one dimmer circuit of the present invention and a three-in-one dimmer circuit in an LED lighting system;
fig. 2 is a schematic diagram of a three-in-one dimming circuit in an LED lighting system according to the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present invention.
It should also be noted that unless explicitly stated or limited otherwise, terms such as "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or one or more intervening elements may also be present. The terms "first," "second," "third," and the like are used merely for convenience in describing the present invention and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," "third," etc. may explicitly or implicitly include one or more such features. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present 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.
Fig. 1 to fig. 2 are schematic structural diagrams of a three-in-one dimming circuit according to a first embodiment of the present application, and for convenience of explanation, only the portions related to the present embodiment are shown, specifically:
a three-in-one dimming circuit comprises a symmetrical constant current source unit 11, a voltage following unit 15 and a signal conversion unit; the symmetrical constant current source unit 11 is used for generating a constant current signal, and the power output end of the symmetrical constant current source unit is connected with the first end of the dimming module to output the constant current signal to the dimming module, so that the dimming module generates an input dimming signal; the first input end of the voltage following unit 15 is connected with the first end of the dimming module to serve as a signal input front end to receive an input dimming signal generated by the dimming module; the second input of the voltage follower unit 15 is connected to its output, and this output follows its input voltage; the output end of the voltage following unit 15 is connected with the signal conversion unit, and the input dimming signal passes through the voltage following unit 15 in a voltage following mode and is output to the signal conversion unit; the signal conversion unit is used for performing signal processing on the input dimming signal and generating a dimming control signal which can act on the driving power supply module according to the input dimming signal; the voltage follower unit 15 is also used for isolating the input dimming signal from the signal conversion unit. In addition, the second end of the dimming module and one end of the voltage following unit, which is used for grounding, are commonly connected with the first grounding end.
It is understood that the first end of the dimming module is the positive end thereof, and the second end of the dimming module is the negative end thereof. Dimming modules are generally divided into three types, including adjustable resistance dimmers, voltage dimmers, and PWM dimmers; the input dimming signal includes a PWM signal, a voltage signal, or a resistance to voltage signal. The three-in-one dimming circuit is respectively and electrically connected with the driving power supply module and the dimming module, and can be used for controlling the driving power supply module to dim the dimming module no matter which dimmer is adopted.
Briefly, the three-in-one dimming circuit processes an input dimming signal through the voltage following unit 15 and the signal processing unit 13, and compares the input dimming signal with a sawtooth wave signal through the first comparator U1 to generate a dimming control signal corresponding to and in proportional relation with the PWM duty ratio of the input dimming signal, wherein the dimming control signal is a first PWM signal; the first PWM signal duty ratio may be changed by adjusting the sawtooth wave signal generated by the sawtooth wave generating unit 12; the first PWM signal can be output to the driving power supply module to adjust the light of the light source module, so that the driving power supply module can be effectively prevented from reaching rated power output when the light adjusting module does not adjust the rated amplitude value.
Furthermore, the present invention provides the symmetrical constant current source unit 11 to supply a high precision constant current, and has the voltage follower unit 15 having high impedance and isolation action; when the dimming module is an adjustable resistor dimmer, the constant current signal only flows through the adjustable resistor and does not flow through the signal conversion unit, so that the shunt phenomenon is avoided, and the accuracy and consistency of the resistor dimming can be ensured; when the dimming module is a voltage dimmer or a PWM dimmer, the voltage follower unit 15 isolates the input dimming signal from the signal conversion unit, so that the problem that one dimming module cannot be used to control a plurality of light source modules due to the consumption of the circuit current of the dimming module by the signal conversion unit can be avoided. Moreover, since the input end of the voltage follower unit 15 is in a high-resistance state, when a user controls multiple lamps, even if a single signal conversion unit is abnormal, the use of other lamps is not affected.
Further, as shown in fig. 1, the voltage follower unit 15 includes a voltage follower U2, a first input end of the voltage follower U2 is connected to the first end of the dimming module as a signal input front end, a second input end of the voltage follower U2 is connected to an output end of the voltage follower U2, and an output end of the voltage follower U2 is further connected to a signal conversion unit, specifically, a signal output unit 14 in the signal conversion unit.
Optionally, as shown in fig. 1, the three-in-one dimming circuit further includes an anti-reflection unit 16, where the anti-reflection unit 16 includes a second diode D2 and a tenth resistor R10; the cathode of the second diode D2 is connected with the first end of the dimming module, the second end of the dimming module is connected with the first grounding end through a tenth resistor R10, and the anode of the second diode D2 is connected with the first grounding end. The resistance of the tenth resistor R10 can be adjusted based on the size of the input dimming signal, and the tenth resistor R10 can consume the input dimming signal when the positive and negative poles of the dimming module are connected reversely when the dimming module is a voltage dimmer or a PWM dimmer, so as not to affect the operation of other circuits.
Further, as shown in fig. 1, the symmetrical constant current source unit 11 includes a ninth resistor R9, a third voltage regulator U3, a first transistor Q1, a second transistor Q2, a first diode D1, and an eighth resistor R8; specifically, the first end of the ninth resistor R9, the reference end of the third voltage stabilizing tube U3, and the cathode of the third voltage stabilizing tube U3 are commonly connected to the circuit power input end VCC; the second end of the ninth resistor R9 is connected with the emitter of the first triode Q1, the base electrode of the first triode Q1 is connected with the base electrode of the second triode Q2, and the collector electrode of the first triode Q1 is connected with the anode of the first diode D1; the cathode of the first diode D1 is connected with the first end of the dimming module; the positive pole of third constant voltage tube U3 connects the projecting pole of second triode Q2, and the collecting electrode of second triode Q2 connects its base and eighth resistance R8 first end, and eighth resistance second end is connected first ground terminal.
It can be understood that the first triode Q1 and the second triode Q2 adopt the same specification type triode, and the conduction voltage drop of the first triode Q1 and the second triode Q2 is the same, i.e. the electric potentials of the emitters of the first triode Q1 and the second triode Q2 are the same; the two ends of the ninth resistor R9 are respectively connected with the circuit power supply input end VCC and the emitter of the first triode Q1, the third voltage stabilizing tube U3 is used as a voltage reference element, and the two ends of the third voltage stabilizing tube U3 are respectively connected with the circuit power supply input end VCC and the emitter of the second triode Q2; due to the characteristics of the third voltage stabilizing tube U3, the voltage at the two ends of the third voltage stabilizing tube U3 is stable and basically unchanged, so that the voltage at the two ends of the ninth resistor R9 is stable, and the symmetrical constant current source unit 11 outputs a constant current signal; the magnitude of the constant current signal can be adjusted by adjusting the resistance value of the ninth resistor R9.
Further, the signal conversion unit includes a sawtooth wave generation unit 12 for generating a sawtooth wave signal, a signal processing unit 13, and a signal output unit 14; one end of the signal processing unit 13 is connected with the output end of the voltage following unit 15 and is used for performing signal processing on an input dimming signal; the signal output unit 14 is connected to the other end of the signal processing unit 13 and the sawtooth wave generating unit 12, and is configured to receive the sawtooth wave signal and the processed input dimming signal, and generate a dimming control signal according to the signals.
Optionally, the signal conversion unit further includes an MCU controller, which is disposed between the signal processing unit 13 and the signal output unit 14, and is used for managing and intelligently adjusting light, so as to fulfill more complex light adjusting requirements; for example, in street lamp application, the street lamp is controlled to work at half power in the latter half of the night, so that the aim of energy saving is fulfilled.
Further, the sawtooth wave generating unit 12 includes a sixth resistor R6, a seventh resistor R7, a fifth resistor R5, a unidirectional silicon controlled rectifier SCR1, a second capacitor C2, and a fourth resistor R4; specifically, the first ends of the sixth resistor R6 and the seventh resistor R7 are commonly connected to the circuit power input end VCC; the second end of the sixth resistor R6 is connected to the first end of the fifth resistor R5, the first end of the second capacitor C2, and the first input end of the signal output unit 14, where the first input end of the signal output unit 14 is specifically an inverting input end of the first comparator U1; the second end of the fifth resistor R5 is connected with the anode of the unidirectional silicon controlled rectifier SCR 1; the second end of the seventh resistor R7 is connected with the control electrode of the unidirectional silicon controlled rectifier SCR1 and the first end of the fourth resistor R4; the cathode of the unidirectional silicon controlled rectifier SCR1, the second end of the second capacitor C2 and the second end of the fourth resistor R4 are connected with the first grounding end.
It will be appreciated that the voltage across the second capacitor C2 increases linearly when the unidirectional thyristor SCR1 is turned off. After a power supply is input into a circuit power supply input end VCC, a second capacitor C2 is charged through a sixth resistor R6, and in the charging process, the voltage on the anode end of the unidirectional silicon controlled rectifier SCR1 gradually becomes larger until the voltage value of the unidirectional silicon controlled rectifier SCR1 under the conduction condition is reached, at the moment, the unidirectional silicon controlled rectifier SCR1 is conducted, and the second capacitor C2 is rapidly discharged; when the voltage on the second capacitor C2 is lower than a certain value, the unidirectional silicon controlled rectifier SCR1 is turned off, and the voltage on the second capacitor C2 is linearly increased again. The sawtooth wave generating unit 12 constantly repeats the above-described process, outputting a sawtooth wave voltage. The slope of the sawtooth signal depends on the second capacitance C2; the on-voltage value of the unidirectional silicon controlled rectifier SCR1 can be changed by controlling the resistance values of the seventh resistor R7 and the fourth resistor R4.
Further, the signal processing unit 13 includes a second resistor R2, a third resistor R3, and a first capacitor C1; specifically, the second end of the third resistor R3 is connected to the second input end of the voltage follower U2 and the output end thereof, the first end of the third resistor R3 is connected to the first end of the first capacitor C1, the first end of the second resistor R2, and the second input end of the signal output unit 14 is specifically the non-inverting input end of the first comparator U1; the second end of the second resistor R2 and the second end of the first capacitor C1 are connected with the first grounding end.
It can be understood that the third resistor R3 and the first capacitor C1 form an RC filter, and when the input dimming signal is the second PWM signal, the input dimming signal can be processed into a dc signal; meanwhile, the second resistor R2 and the third resistor R3 can divide the input dimming signal, so as to facilitate the adjustment of the amplitude matching between the two input ends of the first comparator U1 in the signal output unit 14, and further output the maximum duty ratio.
Further, the signal output unit 14 includes a first comparator U1, a first resistor R1, and an optical coupler OT1; specifically, the inverting input terminal of the first comparator U1 is connected to the output terminal of the sawtooth wave generating unit 12, and the output terminal of the sawtooth wave generating unit 12 is specifically one terminal in which the second terminal of the sixth resistor R6 is commonly connected to the first terminal of the fifth resistor R5 and the first terminal of the second capacitor C2; the non-inverting input end of the first comparator U1 is connected with the output end of the voltage follower U2, or the non-inverting input end of the first comparator U1 is connected with the output end of the voltage follower U2 through the signal processing unit 13; the output end of the first comparator U1 is connected with the second end of the first resistor R1, the first end of the first resistor R1 is connected with the first pin of the optical coupler OT1, the second pin of the optical coupler OT1 is connected with the first grounding end, the third pin of the optical coupler OT1 is connected with the second grounding end, and the fourth pin of the optical coupler OT1 is used as a signal output end. Specifically, the first pin of the optical coupler OT1 represents the positive electrode of the emitter, the second pin thereof represents the negative electrode of the emitter, the third pin thereof represents the E electrode of the receiving end, and the fourth pin thereof represents the C electrode of the receiving end.
As can be appreciated, according to the characteristics of the first comparator U1, the dimming control signal that can be output to the driving power module is generated according to the sawtooth wave signal generated by the sawtooth wave generating unit 12 and the dimming signal generated by the dimming module and processed by the signal output unit 14, and the dimming control signal is the first PWM signal.
In some embodiments of the invention, the voltage dimmer is a 0-10V dimmer, the maximum resistance of the adjustable resistance dimmer is 100k, and the amplitude of the pwm dimmer is 10V; therefore, for compatibility with a 0-10V dimmer, a PWM dimmer having an amplitude of 10V, the constant current signal output from the symmetrical constant current source unit 11 is set to 100 μa in size.
The following describes the working principle of the three-in-one dimming circuit of the present invention:
when the dimming module is an adjustable resistance dimmer, a first input end of a voltage follower U2 in the three-in-one dimming circuit is connected with the adjustable resistance dimmer, and the symmetrical constant current source unit 11 outputs a constant current signal to the adjustable resistance dimmer so that an adjustable resistance in the adjustable resistance dimmer generates a voltage signal, namely an input dimming signal; the input dimming signal is input to the voltage follower U2, and the voltage follower U2 isolates the input dimming signal from the signal processing unit 13, so that the input dimming signal and the resistance value of the adjustable resistor are in a linear relation; the input dimming signal is subjected to voltage division processing by the signal processing unit 13 and then is input to the first comparator U1 in the signal output unit 14 together with the sawtooth wave signal generated by the sawtooth wave generating unit 12, so as to generate a dimming control signal which can be used for driving the power supply module; and the driving power supply module is used for dimming the LED lamp according to the dimming control signal.
When the dimming module is a voltage dimmer, the voltage dimmer outputs a voltage signal, namely an input dimming signal; the input dimming signal is input to the voltage follower U2, and the signal processing unit 13 does not consume current in the voltage dimmer because the voltage follower U2 isolates the input dimming signal from the signal processing unit 13; the input dimming signal is divided by the signal processing unit 13 and then input to the first comparator U1 together with the sawtooth signal, so as to generate a dimming control signal.
When the dimming module is a PWM dimmer, the PWM dimmer outputs a second PWM signal, namely an input dimming signal; the input dimming signal is input to the voltage follower U2, and the signal processing unit 13 does not consume current in the PWM dimmer because the voltage follower U2 isolates the input dimming signal from the signal processing unit 13; the input dimming signal is divided by the signal processing unit 13 and then input to the first comparator U1 together with the sawtooth signal, so as to generate a dimming control signal.
Specifically, when the dimming signal becomes large, the dimming control signal output duty ratio becomes large, whereas when the dimming signal becomes small, the dimming control signal output duty ratio becomes small.
Further, when the dimming module is an adjustable resistance dimmer, since the input end of the voltage follower U2 is in a high resistance state, the constant current signal only flows through the adjustable resistance dimmer, but not through the signal processing unit 13, so as to avoid a shunt phenomenon, and according to the relationship of u=i×r, the dimming precision and consistency of the adjustable resistance dimmer can be ensured;
when the dimming module is a voltage dimmer or a PWM dimmer, the voltage follower U2 has an isolation function, so that the input dimming signal output by the voltage dimmer or the PWM dimmer is isolated from the signal processing unit 13, so that the signal processing unit 13 does not consume the current at the dimming module, and the dimming consistency can be ensured.
In summary, compared with the related art, the invention can realize three-in-one dimming with high precision, and theoretically, the dimming circuit can not consume the current of the dimming module, and can control more light source modules by one dimmer, so that the quantity of the dimming modules is saved for a user to save the cost; meanwhile, when a plurality of light source modules are controlled, even if one signal conversion unit is abnormal, the use of other light source modules is not influenced.
Based on the same inventive concept, the invention also constructs an LED lighting system, which comprises a plurality of light source modules and driving power supply modules, wherein each light source module is connected with the corresponding driving power supply module; the three-in-one dimming circuit is characterized by further comprising a dimmer and more than one three-in-one dimming circuits; one end of each three-in-one dimming circuit is connected with the dimming module, and the other end of each three-in-one dimming circuit is respectively connected with the corresponding driving power supply module.
Further, no matter the dimming module is a PWM (pulse-width modulation) dimmer, a voltage dimmer or an adjustable resistance dimmer, the consistency adjustment can be carried out on the light source module, and the condition that the adjustment output of the dimmer is not matched with the brightness of the light source module is avoided.
Further, since the three-in-one dimming circuit does not consume current in the dimming modules, a single dimmer can control more light source modules, so that the use quantity of the user dimmers is saved, and the cost is saved.
Further, since the voltage follower U2 has a high impedance, when controlling a plurality of light source modules, even if a single three-in-one dimming circuit therein is abnormal, normal operation of the other light source modules is not affected.
It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (8)
1. The three-in-one dimming circuit is characterized by comprising
The symmetrical constant current source unit (11) is used for generating a constant current signal, and the power output end of the symmetrical constant current source unit is connected with the first end of the dimming module to output the constant current signal to the dimming module;
the first input end of the voltage following unit (15) is directly connected with the first end of the dimming module to serve as a signal input front end to receive an input dimming signal generated by the dimming module; the second input end of the voltage following unit (15) is connected to the output end of the voltage following unit, and the output end follows the voltage of the input end of the voltage following unit; the output end of the voltage following unit (15) is connected with a signal conversion unit, and the input dimming signal passes through the voltage following unit (15) in a voltage following mode and is output to the signal conversion unit; the voltage follower unit (15) comprises a voltage follower U2;
the signal conversion unit is used for performing signal processing on the input dimming signal and generating a dimming control signal which can act on the driving power supply module according to the input dimming signal; the signal conversion unit includes a sawtooth wave generation unit (12) for generating a sawtooth wave signal, a signal processing unit (13), and a signal output unit (14); one end of the signal processing unit (13) is connected with the output end of the voltage following unit (15) and is used for performing signal processing on the input dimming signal; the signal output unit (14) is respectively connected with the other end of the signal processing unit (13) and the sawtooth wave generating unit (12) and is used for receiving sawtooth wave signals and processed input dimming signals and generating the dimming control signals according to the sawtooth wave signals and the processed input dimming signals; the signal processing unit (13) comprises a second resistor R2, a third resistor R3 and a first capacitor C1; the second end of the third resistor R3 is connected with the output end of the voltage follower U2, and the first end of the third resistor R3 is connected with the first end of the first capacitor C1, the first end of the second resistor R2 and the second input end of the signal output unit (14); the second end of the second resistor R2 and the second end of the first capacitor C1 are connected with a first grounding end;
the voltage follower unit (15) is further configured to isolate the input dimming signal from the signal conversion unit.
2. The three-in-one dimming circuit of claim 1, wherein the dimming module comprises an adjustable resistance dimmer, a voltage dimmer, or a PWM dimmer;
when the dimming module is an adjustable resistance dimmer, the symmetrical constant current source unit (11) generates a constant current signal and provides working current for the dimming module, so that the dimming module generates an input dimming signal; the voltage following unit (15) receives the input dimming signal, and the first input end of the voltage following unit is in a high-resistance state so as to prevent the constant current signal from flowing to the signal conversion unit;
when the dimming module is a voltage dimmer or a PWM dimmer, an input dimming signal generated by the dimming module is output to the signal conversion unit through the voltage following unit (15), and the voltage following unit (15) isolates the input dimming signal from the signal conversion unit.
3. The three-in-one dimming circuit according to claim 1, wherein the symmetrical constant current source unit (11) comprises a ninth resistor R9, a third voltage regulator U3, a first triode Q1, a second triode Q2 of the same model as the first triode Q1, a first diode D1, and an eighth resistor R8;
the first end of the ninth resistor R9, the reference end of the third voltage stabilizing tube U3 and the cathode of the third voltage stabilizing tube U3 are commonly connected to the circuit power supply input end VCC; the second end of the ninth resistor R9 is connected with the emitter of the first triode Q1, the base electrode of the first triode Q1 is connected with the base electrode of the second triode Q2, and the collector electrode of the first triode Q1 is connected with the anode of the first diode D1; the cathode of the first diode D1 is connected with the first end of the dimming module; the positive pole of third surge tube U3 is connected the projecting pole of second triode Q2, the collecting electrode of second triode Q2 is connected its base and eighth resistance R8 first end, eighth resistance second end is connected first ground connection.
4. The three-in-one dimming circuit according to claim 1, wherein the sawtooth wave generating unit (12) comprises a sixth resistor R6, a seventh resistor R7, a fifth resistor R5, a unidirectional silicon controlled rectifier SCR1, a second capacitor C2, and a fourth resistor R4;
the first ends of the sixth resistor R6 and the seventh resistor R7 are commonly connected to the circuit power supply input end VCC; the second end of the sixth resistor R6 is connected with the first end of the fifth resistor R5, the first end of the second capacitor C2 and the first input end of the signal output unit (14); the second end of the fifth resistor R5 is connected with the anode of the unidirectional silicon controlled rectifier SCR 1; the second end of the seventh resistor R7 is connected with the control electrode of the unidirectional silicon controlled rectifier SCR1 and the first end of the fourth resistor R4; the cathode of the unidirectional silicon controlled rectifier SCR1, the second end of the second capacitor C2 and the second end of the fourth resistor R4 are connected with a first grounding end.
5. The three-in-one dimming circuit according to claim 1 or 4, wherein the signal output unit (14) comprises a first comparator U1, a first resistor R1 and an optocoupler OT1;
the inverting input end of the first comparator U1 is connected to the output end of the sawtooth wave generation unit (12); the non-inverting input end of the first comparator U1 is connected with the output end of the voltage follower U2 through the signal processing unit (13); the output end of the first comparator U1 is connected with the second end of the first resistor R1, the first end of the first resistor R1 is connected with the first pin of the optical coupler OT1, the second pin of the optical coupler OT1 is connected with the first grounding end, the third pin of the optical coupler OT1 is connected with the second grounding end, and the fourth pin of the optical coupler OT1 is used as a signal output end.
6. The three-in-one dimming circuit of claim 1, wherein the signal conversion unit further comprises an MCU controller for managing and intelligent dimming.
7. The three-in-one dimming circuit of claim 4, wherein a slope of the sawtooth signal depends on the second capacitance C2; the magnitude of the on-voltage value of the unidirectional silicon controlled rectifier SCR1 is changed by controlling the resistance value of the seventh resistor R7 and/or the fourth resistor R4.
8. An LED lighting system comprises a plurality of light source modules and driving power supply modules, wherein each light source module is connected with a corresponding driving power supply module; the three-in-one dimming circuit is characterized by further comprising a dimming module and a plurality of three-in-one dimming circuits according to any one of claims 1-7; one end of each three-in-one dimming circuit is connected with the dimming module, and the other end of each three-in-one dimming circuit is respectively connected with the corresponding driving power supply module.
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| CN109309989A (en) * | 2018-10-15 | 2019-02-05 | 深圳市崧盛电子股份有限公司 | A kind of All-in-One dim signal processing circuit |
| CN209472791U (en) * | 2018-10-15 | 2019-10-08 | 深圳市崧盛电子股份有限公司 | A kind of All-in-One dim signal processing circuit |
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| CN212064441U (en) * | 2020-05-29 | 2020-12-01 | 深圳市鼎盛光电有限公司 | Three-in-one dimming circuit and LED lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8829812B2 (en) * | 2008-04-04 | 2014-09-09 | Koninklijke Philips N.V. | Dimmable lighting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109309989A (en) * | 2018-10-15 | 2019-02-05 | 深圳市崧盛电子股份有限公司 | A kind of All-in-One dim signal processing circuit |
| CN209472791U (en) * | 2018-10-15 | 2019-10-08 | 深圳市崧盛电子股份有限公司 | A kind of All-in-One dim signal processing circuit |
| CN210007966U (en) * | 2019-04-19 | 2020-01-31 | 广东新昇电业科技股份有限公司 | LED four-in dimming circuit with source-side feedback |
| CN212064441U (en) * | 2020-05-29 | 2020-12-01 | 深圳市鼎盛光电有限公司 | Three-in-one dimming circuit and LED lamp |
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