LED dimming and color adjustment circuit and LED dimming and color adjustment device

Abstract

The present invention belongs to the technical field of LED lighting, and provides an LED dimming and color adjustment circuit and an LED dimming and color adjustment device, comprising: an AC-DC conversion unit converts an AC signal into a DC regulated signal for power supply; a level conversion unit is used to receive a control signal to generate a corresponding sampling signal; a pulse width modulation unit generates a plurality of PWM signals by the sampling signal and adjusts the duty cycle of each PWM signal according to the dimming information and color adjustment information in the control signal; a plurality of LED driving units receive the corresponding PWM signals and generate a constant current driving signal to drive LED light sources of corresponding colors, thereby realizing a segmented stepless dimmer to dim and color adjust an LED lamp, which is simple to use and has a large adjustment range, and the sensitivity and stability of the LED lamp in the dimming and color adjustment process are guaranteed through line connection, and the packet loss phenomenon in the wireless dimming and color adjustment process is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of LED lighting, and in particular relates to an LED dimming and color adjustment circuit and an LED dimming and color adjustment device. Background Art

[0002] LED is being widely used in the lighting field as a small, green, energy-saving and controllable light source. The color temperature of a single LED is constant and cannot be adjusted dynamically. However, the appropriate brightness and color temperature can not only create a more comfortable environment, but also reduce unnecessary light to achieve energy conservation and emission reduction. Therefore, it is very important to dim and adjust the color. Adding dimming and color adjustment functions to LED light sources is the mainstream trend of LED light sources on the market. There are two main types of dimming and color adjustment circuits on the market:

[0003] 1. Switch color adjustment is mainly achieved by connecting a switch in series at the AC input end, but its function is single and the adjustment range is small. It can only perform segmented color adjustment and cannot achieve the function of stepless dimming.

[0004] 2. Wireless dimming and color adjustment mainly realizes the function of dimming and color adjustment of LED lamps by communicating with wireless control terminals and wireless communication modules. The main current wireless communication modules are ZIGBEE, WIFI, Bluetooth, etc. During use, users need to be familiar with the use of wireless control terminals. The complex use of control terminals in the existing technology leads to low user acceptance, and the wireless control terminals and wireless modules are expensive, and there is a certain packet loss rate, which leads to operation failure.

[0005] In addition, the traditional 0-10V dimmer has incompatibility issues in the application of LED lamps. Users need to modify the circuit during actual use, which greatly increases the use cost of the 0-10V dimmer. Therefore, how to make the circuit compatible with the 0-10V dimmer and realize the dimming and color adjustment functions at the same time has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] In order to solve the problems existing in the existing dimming and color adjustment circuit, the purpose of the present invention is to provide an LED dimming and color adjustment circuit and an LED dimming and color adjustment device, aiming to solve the problems existing in the existing LED dimming and color adjustment circuit such as small adjustment range, complex operation, high cost and incompatibility with 0-10V dimmer.

[0007] An embodiment of the present invention provides an LED dimming and color adjustment circuit, which is connected between a segmented stepless dimmer and an LED light source to make the segmented stepless dimmer compatible with the LED light source, including:

[0008] An AC-DC conversion unit, used for converting an AC power signal into a DC regulated voltage signal for power supply, wherein two input terminals of the AC-DC conversion unit are connected to two power output terminals of the segmented stepless dimmer;

[0009] A DC-DC conversion unit, used for converting the DC regulated voltage signal into a first DC voltage and a second DC voltage, wherein an input end of the DC-DC conversion unit is connected to an output end of the AC-DC conversion unit;

[0010] A level conversion unit, for converting the control signal output by the segmented stepless dimmer into a sampling signal after being powered by the first DC voltage, wherein the control signal includes dimming information and color adjustment information, the dimming information includes a dimming preset value, and the color adjustment information includes a color adjustment preset value, a power supply end of the level conversion unit is connected to the first output end of the DC-DC conversion unit, and an input end of the level conversion unit is connected to the control signal output end of the segmented stepless dimmer;

[0011] a pulse width modulation unit, configured to generate a plurality of PWM signals according to the sampling signal after being powered by the second DC voltage, wherein the sum of the duty cycles of the PWM signals is equal to a dimming preset value, and the ratio of the duty cycles of the PWM signals is equal to a color adjustment preset value, wherein a power supply terminal of the pulse width modulation unit is connected to the second output terminal of the DC-DC conversion unit, and an input terminal of the pulse width modulation unit is connected to the output terminal of the level conversion unit;

[0012] A plurality of LED driving units receive the plurality of PWM signals one by one, each LED driving unit generates a constant current driving signal according to the received PWM signal to drive an LED light source of a corresponding color, and the color temperature and brightness are adjusted by adjusting the brightness ratio of LED light sources of different colors. The power supply end of the LED driving unit is connected to the output end of the AC-DC conversion unit, the driving ends of the plurality of LED driving units are respectively connected to the plurality of output ends of the pulse width modulation unit, and the output ends of the plurality of LED driving units are connected to a plurality of LED light sources of different colors.

[0013] Another object of the embodiment of the present invention is to provide an LED dimming and color adjustment device including the above-mentioned LED dimming and color adjustment circuit, wherein the device also includes a segmented stepless dimmer;

[0014] The two power input ends of the segmented stepless dimmer are connected to the AC power supply, and the two power output ends of the segmented stepless dimmer are connected to the two input ends of the AC-DC conversion unit. The control end of the segmented stepless dimmer controls the connection between the power input end and the power output end of the segmented stepless dimmer by receiving user operation instructions, thereby controlling whether the LED dimming and color adjustment circuit is powered on or off.

[0015] The present invention adopts an LED dimming and color adjustment circuit and an LED dimming and color adjustment device including an AC-DC conversion unit, a DC-DC conversion unit, a level conversion unit, a pulse width modulation unit, and multiple LED driving units. The AC-DC conversion unit converts an AC signal into a DC regulated voltage signal to provide a DC power supply for the DC-DC conversion unit and the multiple LED driving units; the DC-DC conversion unit is used to convert the DC regulated voltage signal into a first DC voltage and a second DC voltage to respectively power the level conversion unit and the pulse width modulation unit; the level conversion unit is used to receive a control signal sent by a segmented stepless dimmer to generate a corresponding sampling signal; the pulse width modulation unit generates multiple PWM signals from the sampling signal and adjusts the duty cycle of each PWM signal according to the dimming information and color adjustment information in the control signal; the multiple LED driving units receive the corresponding PWM signals and generate corresponding constant current driving signals to drive the LED light sources of corresponding colors, thereby realizing dimming and color adjustment of the LED lamp through the segmented stepless dimmer. The LED dimming and color adjustment circuit and the LED dimming and color adjustment device are easy to use and have a large adjustment range. The sensitivity and stability of the LED lamp in the dimming and color adjustment process are guaranteed through line connection, and the packet loss phenomenon in the wireless dimming and color adjustment process is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a unit structure diagram of the LED dimming and color adjustment circuit provided in an embodiment of the present invention.

[0017] Figure 2 1 is an exemplary circuit structure diagram of an LED dimming and color adjustment circuit provided in an embodiment of the present invention.

[0018] Description of reference numerals:

[0019] 10: Segmented stepless dimmer; 20: LED dimming and color adjustment circuit;

[0020] 30: Multiple LED light sources of different colors;

[0021] 201: AC-DC conversion unit; 202: DC-DC conversion unit;

[0022] 203: level conversion unit; 204: pulse width modulation unit;

[0023] 205: LED driver unit. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The present invention adopts an LED dimming and color adjustment circuit and an LED dimming and color adjustment device including an AC-DC conversion unit, a DC-DC conversion unit, a level conversion unit, a pulse width modulation unit, and multiple LED driving units. The AC-DC conversion unit converts an AC signal into a DC regulated voltage signal to provide a DC power supply for the DC-DC conversion unit and the multiple LED driving units; the DC-DC conversion unit is used to convert the DC regulated voltage signal into a first DC voltage and a second DC voltage to respectively power the level conversion unit and the pulse width modulation unit; the level conversion unit is used to receive a control signal sent by a segmented stepless dimmer to generate a corresponding sampling signal, the pulse width modulation unit generates multiple PWM signals from the sampling signal and adjusts the duty cycle of each PWM signal according to the dimming information and color adjustment information in the control signal; the multiple LED driving units receive the corresponding PWM signals and generate corresponding constant current driving signals to drive the LED light sources of corresponding colors, thereby realizing dimming and color adjustment of the LED lamp through the segmented stepless dimmer. The LED dimming and color adjustment circuit and the LED dimming and color adjustment device are easy to use and have a large adjustment range. The sensitivity and stability of the LED lamp in the dimming and color adjustment process are guaranteed through line connection, and the packet loss phenomenon in the wireless dimming and color adjustment process is avoided.

[0026] Figure 1 The module structure diagram of the LED dimming and color adjustment circuit provided by the embodiment of the present invention is shown. For the convenience of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0027] The LED dimming and color adjustment circuit 20 provided in the embodiment of the present invention can be applied to any LED dimming and color adjustment device. The LED dimming and color adjustment circuit 20 is connected to a segmented stepless dimmer 10 and a plurality of LED light sources 30 of different colors. The segmented stepless dimmer 10 is used to emit a control signal having dimming information and color adjustment information. The dimming information includes a dimming preset value, and the color adjustment information includes a color adjustment preset value.

[0028] The LED dimming and color adjustment circuit 20 includes:

[0029] The AC-DC conversion unit 201 is used to control the communication with the AC power through the segmented stepless dimmer 10, and convert the AC power signal into a DC regulated voltage signal for power supply. The two input ends of the AC-DC conversion unit 201 are connected to the two power output ends of the segmented stepless dimmer 10;

[0030] A DC-DC conversion unit 202, used for converting the DC regulated voltage signal into a first DC voltage and a second DC voltage, wherein the input end of the DC-DC conversion unit 202 is connected to the output end of the AC-DC conversion unit 201;

[0031] A level conversion unit 203 is used to convert the control signal output by the segmented stepless dimmer 10 into a sampling signal after being powered by the first DC voltage, wherein the control signal includes dimming information and color adjustment information, the dimming information includes a dimming preset value, and the color adjustment information includes a color adjustment preset value. The power supply end of the level conversion unit 203 is connected to the first output end of the DC-DC conversion unit 202, and the input end of the level conversion unit 203 is connected to the control signal output end of the segmented stepless dimmer 10;

[0032] a pulse width modulation unit 204, configured to generate a plurality of PWM signals according to the sampling signal after being powered by the second DC voltage, wherein the sum of the duty cycles of the PWM signals is equal to a dimming preset value, and the ratio of the duty cycles of the PWM signals is equal to a color adjustment preset value, wherein the power supply end of the pulse width modulation unit is connected to the second output end of the DC-DC conversion unit 202, and the input end of the pulse width modulation unit 204 is connected to the output end of the level conversion unit 203;

[0033] Multiple LED driving units 205 receive the multiple PWM signals one by one, and each LED driving unit 205 generates a constant current driving signal according to the received PWM signal to drive the LED light source of the corresponding color, and the color temperature and brightness are adjusted by adjusting the brightness ratio of the LED light sources 30 of different colors. The power supply end of the LED driving unit 205 is connected to the output end of the AC-DC conversion unit 201, and the driving ends of the multiple LED driving units 205 are respectively connected to the multiple output ends of the pulse width modulation unit 204, and the output ends of the multiple LED driving units 205 are connected to multiple LED light sources 30 of different colors.

[0034] In the embodiment of the present invention, when the output end of the segmented stepless dimmer 10 outputs a control signal, the control signal includes dimming information and color adjustment information, the dimming information includes a dimming preset value, and the color adjustment information includes a color adjustment preset value; the level conversion unit 203 outputs a sampling signal according to the control signal, and the pulse width modulation unit 204 generates a plurality of PWM signals according to the sampling signal output by the level conversion unit 203. If the control signal output by the segmented stepless dimmer 10 only includes the dimming information, the duty cycle of the plurality of PWM signals is adjusted according to the dimming information so that the sum of the duty cycles of the plurality of PWM signals is equal to the dimming preset value, and the pulse width modulation unit 204 will remember the power-on state and turn on the segmented stepless dimmer 1 again within the set time. 0 switch, the control signal output by the segmented stepless dimmer 10 includes dimming information and color adjustment information, the dimming information includes a dimming preset value, the color adjustment information includes a color adjustment preset value, the pulse width modulation unit 204 generates a corresponding plurality of PWM signal duty cycles according to the sampling signal output by the level conversion unit 203, the sum of the plurality of PWM signal duty cycles is equal to the dimming preset value, and the ratio of the plurality of PWM signal duty cycles is equal to the color adjustment preset value; each of the plurality of LED driving units 205 adjusts the output corresponding constant current driving signal according to the received PWM signal, and the plurality of LED light sources 30 of different colors adjust the brightness according to the corresponding constant current driving signal received, thereby realizing the dimming and color adjustment function of the LED lamp.

[0035] Figure 2 : is an example circuit structure diagram of an LED dimming and color adjustment circuit provided by an embodiment of the present invention. For the sake of convenience, only the part related to the present invention is shown, which is described in detail as follows:

[0036] As an embodiment of the present invention, the segmented stepless dimmer 10 may be a 0-10V dimmer, and the voltage range of the control signal output by the segmented stepless dimmer 10 may be 0-10V.

[0037] As an embodiment of the present invention, the segmented stepless dimmer 10 may be a 0-10.5V dimmer, and the voltage range of the control signal output by the segmented stepless dimmer 10 includes but is not limited to 0-10.5V.

[0038] As an embodiment of the present invention, the segmented stepless dimmer 10 may be a 0-10V dimmer, and the 0-10V dimmer includes all control signals that can output a voltage range of 0-10V on the domestic and foreign markets.

[0039] As an embodiment of the present invention, the control signal output by the segmented stepless dimmer 10 may be an analog control signal.

[0040] As an embodiment of the present invention, the AC-DC conversion unit 201 includes:

[0041] Rectifier bridge U1, capacitor C1, resistor R1, capacitor C2, resistor R2, diode D1, inductor L1, resistor R3, resistor R4, diode D2, capacitor C3, switch tube driver chip U2, capacitor C4, resistor R5, first switch tube M1, diode D3, capacitor C5, first transformer T1;

[0042] The first input terminal 1 and the second input terminal 3 of the rectifier bridge U1 are respectively connected to the live wire and the neutral wire of the AC power supply, the first output terminal 2 of the rectifier bridge U1 is connected to the first end of the capacitor C1, the first end of the resistor R1, the first end of the capacitor C2, the first end of the resistor R2, and the first input terminal of the first transformer T1, the second output terminal 4 of the rectifier bridge and the second end of the capacitor C1 are grounded, the second end of the resistor R2 and the second end of the capacitor C2 are commonly connected to the cathode of the diode D1, the current input terminal of the first switch tube M1 and the anode of the diode D1 are commonly connected to the second input terminal of the first transformer T1, the second end of the resistor R1, the cathode of the diode D2 and the first end of the capacitor C3 are commonly connected to the power pin VDD of the switch tube driving chip U2, the first end of the inductor L1 and the first end of the resistor R3 are commonly connected to the anode of the diode D2, the second end of the inductor L1 is connected to the power ground, the second end of the resistor R3 and the first end of the resistor R4 are commonly connected The first terminal of the AC-DC converter 201 is connected to the voltage feedback pin FB of the switch tube driver chip U2, the second end of the capacitor C3 is connected to the power ground pin GND of the switch tube driver chip U2, the driving pin GATE of the switch tube driver chip U2 is connected to the control end of the first switch tube M1, the current output end of the first switch tube M1 and the first end of the R5 are commonly connected to the current sampling pin CS of the switch tube driver chip U2, the internal error amplifier pin COMP of the switch tube driver chip U2 is connected to the first end of the capacitor C4, the second end of the resistor R4, the second end of the capacitor C4 and the second end of the resistor R5 are commonly connected to the power ground, the first output end of the first transformer T1 is connected to the anode of the diode D3, the second output end of the first transformer T1 and the second end of the capacitor C5 are commonly connected to the power ground, and the common point formed by the cathode of the diode D3 and the first end of the capacitor C5 is used as the output end of the AC-DC conversion unit 201 to output a DC regulated voltage signal for power supply.

[0043] As an embodiment of the present invention, the first switch tube M1 is an N-type MOS tube, the drain of the N-type MOS tube is the current input end of the first switch tube M1, the source of the N-type MOS tube is the current output end of the first switch tube M1, and the gate of the N-type MOS tube is the control end of the first switch tube M1.

[0044] As an embodiment of the present invention, the LED driving unit 205 includes:

[0045] Resistor R17, resistor R18, Zener diode Z3, diode D5, diode D6, capacitor C16, capacitor C14, capacitor C17, DAC chip U5, resistor R19, resistor R20, resistor R21, capacitor C15, inductor L2 and transformer T2;

[0046] The first end of the resistor R17, the cathode of the diode D5, the cathode of the diode D6, the first end of the resistor R21, the first end of the capacitor C16, the first end of the resistor R19, the first end of the resistor R20 and the power pin VIN of the DAC chip U5 form a common point as the power end of the LED driving unit 205, the second end of the resistor R17, the first end of the resistor R18, the cathode of the voltage-stabilizing diode Z3 and the PWM input end EN of the DAC chip U5 form a common point as the input end of the LED driving unit 205, the second end of the resistor R18, the anode of the voltage-stabilizing diode Z3, the second end of the capacitor C16, the TM end TM of the DAC chip U5 and the ground end GND of the DAC chip U5 are connected to the signal ground, and the analog signal input end CF of the DAC chip is connected to the ground through the Capacitor C14 is connected to the signal ground, the second end of resistor R21 is connected to the first end of capacitor C17, the second end of capacitor C17, the anode of diode D5, the anode of diode D6 and the first end of inductor L2 are connected to the drain terminal LX of the built-in MOS of DAC chip U5, the second end of inductor L2 and the first end of capacitor C15 are connected to the first input terminal of the second transformer T2, the current sampling input terminal SEM of DAC chip U5, the second end of resistor R19, the second end of resistor R20 and the second end of capacitor C15 are connected to the second input terminal of the second transformer T2, and the first output terminal and the second output terminal of the second transformer T2 are respectively used as the first output terminal and the second output terminal of the LED driving unit 205 to output a constant current driving signal to drive the corresponding LED light source 30.

[0047] As an embodiment of the present invention, the DC-DC conversion unit 202 includes:

[0048] Resistor R6, voltage stabilizing diode Z1, resistor R7, capacitor C6, capacitor C7, second switch tube Q1, third switch tube Q2, capacitor C10, resistor R8, resistor R9, capacitor C8, capacitor C9 and voltage stabilizing chip U3;

[0049] The first end of the resistor R6 and the current input end of the second switch tube Q1 form a common point as the power supply end of the power supply unit 210. The second end of the resistor R6 and the cathode of the voltage-stabilizing diode Z1 are commonly connected to the control end of the second switch tube Q1. The current output end of the second switch tube Q1, the first end of the capacitor C6, the first end of the capacitor C7, the first end of the resistor R7, and the current input end of the third switch tube Q2 form a common point as the first output end of the power supply unit 210. The control end of the third switch tube Q2, the first end of the capacitor C10, and the second end of the resistor R7 are commonly connected to the control end of the second switch tube Q1. Connected to the cathode of the voltage stabilizing chip U3, the second end of the capacitor C10, the first end of the resistor R8 and the first end of the resistor R9 are commonly connected to the control end of the voltage stabilizing chip U3, the current output end of the third switch tube Q2, the second end of the resistor R8, the first end of the capacitor C8 and the first end of the capacitor C9 form a common point as the second output end of the power supply unit 210, the anode of the voltage stabilizing diode Z1, the second end of the capacitor C6, the second end of the capacitor C7, the anode of the voltage stabilizing chip U3, the second end of the resistor R9, the second end of the capacitor C8 and the second end of the capacitor C9 are commonly connected to the signal ground.

[0050] As an embodiment of the present invention, the second switch tube Q1 and the third switch tube Q2 are both NPN type transistors, the collector of the NPN type transistor is the current input end of the second switch tube Q1 and the third switch tube Q2, the emitter of the NPN type transistor is the current output end of the second switch tube Q1 and the third switch tube Q2, and the base of the NPN type transistor is the control end of the second switch tube Q1 and the third switch tube Q3.

[0051] As an embodiment of the present invention, the level conversion unit 203 includes:

[0052] Resistor R10, resistor R11, fourth switch tube Q3, diode D4, resistor R12, resistor R13, voltage zener diode Z2, resistor R14, resistor R15, capacitor C12, capacitor C11;

[0053] The first end of the resistor R10 and the cathode of the diode D4 form a common point as the input end of the level conversion unit 203 for receiving the control signal output by the segmented stepless dimmer 10. The second end of the resistor R10, the current input end of the fourth switch tube and the first end of the resistor R11 form a common point as the power supply end of the level conversion unit 220. The anode of the diode D4 and the second end of the resistor R11 are commonly connected to the control end of the fourth switch tube Q3. The current output end of the fourth switch tube is connected to the first end of the resistor R12. The second end of the resistor R12, the first end of the resistor R13 and the first end of the resistor R14 are commonly connected to the cathode of the voltage-stabilizing diode Z2. The second end of the resistor R14 and the first end of the capacitor C12 are commonly connected to the first end of the resistor R15. The second end of R15 and the first end of the capacitor C11 form a common point as the output end of the level conversion unit 203. The resistor R13, the anode of the voltage-stabilizing diode Z2, the second end of the capacitor C12 and the second end of the capacitor C11 are commonly connected to the signal ground.

[0054] As an embodiment of the present invention, the aforementioned fourth switch tube Q3 is an NPN type transistor, the collector of the NPN type transistor is the current input end of the fourth switch tube Q3, the emitter of the NPN type transistor is the current output end of the fourth switch tube Q3, and the base of the NPN type transistor is the control end of the fourth switch tube Q3.

[0055] As an embodiment of the present invention, the pulse width modulation unit 204 includes:

[0056] PWM regulation chip U4, resistor R16, capacitor C13;

[0057] A first end of the resistor R16 and a power supply terminal VDD of the PWM regulating chip U4 form a common point as a power supply terminal of the pulse width modulation unit 204. The input signal sampling pin AD1 of the PWM regulating chip U4 is connected to the output terminal of the aforementioned level conversion unit 203. A second end of the resistor R16 and a first end of the capacitor C13 are commonly connected to a reset pin RST of the PWM regulating chip U4. The capacitor C13 and a ground terminal VSS of the PWM regulating chip U4 are commonly connected to a signal ground. The AD0 port of the PWM regulating chip U4 is vacant. Multiple PWM signal output terminals ADn (n=2, 3...n) of the PWM regulating chip U4 serve as multiple output terminals of the pulse width modulation unit 204.

[0058] As an embodiment of the present invention, the signal ground terminal of the DC-DC conversion unit 202, the signal ground terminal of the level conversion unit 203, and the signal ground terminal of the pulse width modulation unit 204 are connected to the signal ground together with the signal ground terminal of the aforementioned segmented dimmer 10. As an embodiment of the present invention, the segmented stepless dimmer 10 has the function of controlling the startup circuit time and the function of adjusting the output control signal voltage level.

[0059] As an embodiment of the present invention, the segmented stepless dimmer 10 starts the circuit to adjust the color of the LED lamp within a set time through the power-on memory function of the pulse width modulation unit 204, and the segmented stepless dimmer 10 realizes the dimming function of the LED lamp by outputting the voltage of the control signal through sliding and twisting control.

[0060] In a possible design, the positive pole of the 0-10V dimmer is connected to the live wire of the power supply, and the negative pole is connected to the neutral wire of the power supply. When the 0-10V dimmer turns on the switch for the first time, the circuit is turned on. When the sliding adjustment knob is moved to the X position, PWM1 outputs a duty cycle a1, and PWM2 outputs a duty cycle b1, wherein a1+b1=X / 10*100%, (X=0, 1, 2···n···10). When the 0-10V dimmer turns on the switch for the second time, the circuit is turned on. If the sliding knob is moved to the X position, PWM1 outputs a duty cycle a2, and PWM2 outputs a duty cycle b2, wherein a2+b2=X / 10*100%, (X=0, 1, 2···n···10). And so on. The aforementioned pulse width modulation unit 204 will remember the state of the last power-on, and the switch realizes switching of different duty cycles within the set time to realize the color adjustment function, and the dimming function is realized by sliding the knob.

[0061] The present invention adopts an LED dimming and color adjustment circuit and an LED dimming and color adjustment device including an AC-DC conversion unit, a DC-DC conversion unit, a level conversion unit, a pulse width modulation unit, and multiple LED driving units. The AC-DC conversion unit converts an AC signal into a DC regulated voltage signal to provide a DC power supply for the DC-DC conversion unit and the multiple LED driving units; the DC-DC conversion unit is used to convert the DC regulated voltage signal into a first DC voltage and a second DC voltage to respectively power the level conversion unit and the pulse width modulation unit; the level conversion unit is used to receive a control signal sent by a segmented stepless dimmer to generate a corresponding sampling signal, the pulse width modulation unit generates multiple PWM signals from the sampling signal and adjusts the duty cycle of each PWM signal according to the dimming information and color adjustment information in the control signal; the multiple LED driving units receive the corresponding PWM signals and generate corresponding constant current driving signals to drive the LED light sources of corresponding colors, thereby realizing dimming and color adjustment of the LED lamp through the segmented stepless dimmer. The LED dimming and color adjustment circuit and the LED dimming and color adjustment device are easy to use and have a large adjustment range. The sensitivity and stability of the LED lamp in the dimming and color adjustment process are guaranteed through line connection, and the packet loss phenomenon in the wireless dimming and color adjustment process is avoided.

[0062] Another object of the embodiment of the present invention is to provide an LED dimming and color adjustment device including the above-mentioned LED dimming and color adjustment circuit, and the LED dimming and color adjustment device also includes a segmented stepless dimmer;

[0063] The two power input terminals of the segmented stepless dimmer 10 are connected to the AC power supply, and the two power output terminals of the segmented stepless dimmer 10 are connected to the two input terminals of the AC-DC conversion unit 201. The control terminal of the aforementioned segmented stepless dimmer 10 controls the connection between the power input terminal and the power output terminal of the segmented stepless dimmer 10 by receiving user operation instructions, thereby controlling whether the LED dimming and color adjustment circuit 20 is powered on.

[0064] As an embodiment of the present invention, the segmented stepless dimmer 10 may be a 0-10V dimmer, and the voltage range of the control signal output by the segmented stepless dimmer 10 may be 0-10V.

[0065] As an embodiment of the present invention, the segmented stepless dimmer 10 may be a 0-10.5V dimmer, and the voltage range of the control signal output by the segmented stepless dimmer 10 includes but is not limited to 0-10.5V.

[0066] As an embodiment of the present invention, the segmented stepless dimmer 10 may be a 0-10V dimmer, and the 0-10V dimmer includes all control signals that can output a voltage range of 0-10V on the domestic and foreign markets.

[0067] As an embodiment of the present invention, the control signal output by the segmented stepless dimmer 10 may be an analog control signal.

[0068] As an embodiment of the present invention, the segmented stepless dimmer 10 has the function of controlling the start-up circuit time and the function of adjusting the voltage level of the output control signal.

[0069] As an embodiment of the present invention, the segmented stepless dimmer 10 adjusts the color of the LED lamp when the circuit is started within a set time through the power-on memory function of the pulse width modulation unit. The segmented stepless dimmer 10 realizes the dimming function of the LED lamp by outputting the voltage of the control signal through sliding and twisting control.

[0070] As an embodiment of the present invention, the level conversion unit converts the control signal output by the segmented dimming controller into a sampling signal that can be recognized by the pulse width modulation unit, so that the segmented dimming controller is compatible with the LED lamp.

[0071] In an embodiment of the present invention, the two power input terminals of the segmented stepless dimmer 10 include a first input terminal and a second input terminal, and the first input terminal and the second input terminal are respectively connected to the live wire and the neutral wire of the AC power supply. The two power output terminals of the segmented stepless dimmer 10 include a first output terminal and a second output terminal. The two input terminals of the AC-DC conversion unit 201 include a first input terminal and a second input terminal, and the first input terminal and the second input terminal are respectively connected to the first output terminal and the second output terminal of the segmented stepless dimmer 10.

[0072] In the embodiment of the present invention, the segmented stepless dimmer 10 receives the user's operation instruction to connect the power input terminal and the power output terminal of the segmented stepless dimmer 10, the LED dimming and color adjustment circuit is turned on, and the LED starts to work. After the user inputs an instruction to the control terminal of the segmented stepless dimmer, the segmented stepless dimmer outputs a control signal of the corresponding instruction. After the control signal passes through the resistor R10, the switch tube Q3 is turned on under the first DC voltage output by the DC-DC conversion unit 202. The control signal passes through the switch tube Q3 and the current limiting resistor R12 to reach the negative electrode of the voltage regulator diode Z2. The voltage regulator diode Z2 is used to protect the PWM regulation chip U4. If the voltage is too large, the voltage regulator diode Z2 is broken down, and the current directly enters the ground. The aforementioned control signal is After passing through the RC detection circuit, it enters the PWM regulation chip U4 as a current sampling signal. After being processed by the PWM regulation chip U4, multiple PWM signals are output. If the aforementioned instruction only contains dimming information, the sum of the duty cycles of each PWM signal is equal to the dimming preset value in the control signal. If the aforementioned instruction contains both color adjustment information and dimming information, the sum of the duty cycles of each PWM signal is equal to the dimming preset value, and the ratio of the duty cycles of each PWM signal is equal to the color adjustment preset value. Multiple LED driving units receive the aforementioned multiple PWM signals one by one, and each LED driving unit generates a constant current driving signal according to the received PWM signal to drive the LED light source of the corresponding color, thereby completing the dimming and color adjustment of the LED lamp.

[0073] The embodiments of the present invention can be directly compatible with LED light sources, and users do not need to modify the circuits during actual use, which reduces the use cost, and can achieve precise dimming and color adjustment, with low production cost.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An LED dimming and color adjustment circuit, characterized in that: The LED dimming and color adjustment circuit is connected between the segmented stepless dimmer and the LED light source, so that the segmented stepless dimmer is compatible with the LED light source. The control end of the segmented stepless dimmer controls the connection between the power input end and the power output end of the segmented stepless dimmer by receiving a user operation instruction, thereby controlling whether the LED dimming and color adjustment circuit is powered on or off. The LED dimming and color adjustment circuit includes: An AC-DC conversion unit, used for converting an AC power signal into a DC regulated voltage signal for power supply, wherein two input terminals of the AC-DC conversion unit are connected to two power output terminals of the segmented stepless dimmer; A DC-DC conversion unit, used for converting the DC regulated voltage signal into a first DC voltage and a second DC voltage, wherein an input end of the DC-DC conversion unit is connected to an output end of the AC-DC conversion unit; A level conversion unit, for converting the control signal output by the segmented stepless dimmer into a sampling signal after being powered by the first DC voltage, wherein the control signal includes dimming information and color adjustment information, the dimming information includes a dimming preset value, and the color adjustment information includes a color adjustment preset value, a power supply end of the level conversion unit is connected to the first output end of the DC-DC conversion unit, and an input end of the level conversion unit is connected to the control signal output end of the segmented stepless dimmer; a pulse width modulation unit, configured to generate a plurality of PWM signals according to the sampling signal after being powered by the second DC voltage, wherein the sum of the duty cycles of the PWM signals is equal to the dimming preset value, the ratio of the duty cycles of the PWM signals is equal to the color adjustment preset value, the power supply end of the pulse width modulation unit is connected to the second output end of the DC-DC conversion unit, and the input end of the pulse width modulation unit is connected to the output end of the level conversion unit; A plurality of LED driving units receive the plurality of PWM signals one by one, each LED driving unit generates a constant current driving signal according to the received PWM signal to drive the LED light source of the corresponding color, and the color temperature and brightness are adjusted by adjusting the brightness ratio of the LED light sources of different colors, the power supply end of the LED driving unit is connected to the output end of the AC-DC conversion unit, the driving ends of the plurality of LED driving units are respectively connected to the plurality of output ends of the pulse width modulation unit, and the output ends of the plurality of LED driving units are connected to a plurality of LED light sources of different colors; The level conversion unit comprises: Resistor R10, resistor R11, fourth switch tube, diode D4, resistor R12, resistor R13, Zener diode Z2, resistor R14, resistor R15, capacitor C12, capacitor C11; The first end of the resistor R10 and the cathode of the diode D4 form a common point as the input end of the level conversion unit, the second end of the resistor R10, the current input end of the fourth switch tube and the first end of the resistor R11 form a common point as the power supply end of the level conversion unit, the anode of the diode D4 and the second end of the resistor R11 are commonly connected to the control end of the fourth switch tube, the current output end of the fourth switch tube is connected to the first end of the resistor R12, the second end of the resistor R12, the first end of the resistor R13 and the first end of the resistor R14 are commonly connected to the cathode of the voltage-stabilizing diode Z2, the second end of the resistor R14 and the first end of the capacitor C12 are commonly connected to the first end of the resistor R15, the second end of R15 and the first end of the capacitor C11 form a common point as the output end of the level conversion unit to output a voltage signal, the second end of the resistor R13, the anode of the voltage-stabilizing diode Z2, the second end of the capacitor C12 and the second end of the capacitor C11 are commonly connected to the signal ground.

2. The LED dimming and color adjustment circuit according to claim 1, characterized in that: The AC-DC conversion unit comprises: Rectifier bridge, capacitor C1, resistor R1, capacitor C2, resistor R2, diode D1, inductor L1, resistor R3, resistor R4, diode D2, capacitor C3, switch tube driver chip, capacitor C4, resistor R5, first switch tube, diode D3, capacitor C5 and first transformer; The first input end and the second input end of the rectifier bridge are respectively two input ends of the AC-DC conversion unit. The first output end of the rectifier bridge and the first end of the capacitor C1, the first end of the resistor R1, the first end of the capacitor C2 and the first end of the resistor R2 are connected to the first input end of the first transformer. The second end of the capacitor C1 and the second output end of the rectifier bridge are grounded at the same time. The second end of the resistor R2 and the second end of the capacitor C2 are connected to the cathode of the diode D1 at the same time. The current input end of the first switch tube and the anode of the diode D1 are connected to the second input end of the first transformer. The second end of the resistor R1, the cathode of the diode D2 and the first end of the capacitor C3 are connected to the power pin of the switch tube driver chip. The first end of the inductor L1 and the first end of the resistor R3 are connected to the anode of the diode D2. The second end of the inductor L1 is connected to the power ground. The second end of the resistor R3 and the first end of the resistor R4 are connected to the voltage feedback pin of the switch tube driver chip, the second end of the capacitor C3 and the power ground pin of the switch tube driver chip are connected to the ground, the driving pin of the switch tube driver chip is connected to the control end of the first switch tube, the current output end of the first switch tube and the first end of the resistor R5 are connected to the current sampling pin of the switch tube driver chip, the internal error amplifier pin of the switch tube driver chip is connected to the first end of the capacitor C4, the second end of the resistor R4, the second end of the capacitor C4 and the second end of the resistor R5 are connected to the ground, the first output end of the first transformer is connected to the anode of the diode D3, the second output end of the first transformer and the first end of the capacitor C5 are connected to the power ground, and the cathode of the diode D3 and the second end of the capacitor C5 form a common point as the output end of the AC-DC conversion unit to output a DC regulated voltage signal for power supply.

3. The LED dimming and color adjustment circuit according to claim 2, characterized in that: The first switch tube is an N-type MOS tube, the drain of the N-type MOS tube is the current input end of the first switch tube, the source of the N-type MOS tube is the current output end of the first switch tube, and the gate of the N-type MOS tube is the control end of the first switch tube.

4. The LED dimming and color adjustment circuit according to claim 1, characterized in that: The LED driving unit comprises: Resistor R17, resistor R18, voltage zener diode Z3, diode D5, diode D6, capacitor C16, capacitor C14, capacitor C17, DAC chip, resistor R19, resistor R20, resistor R21, capacitor C15, inductor L2 and a second transformer; The first end of the resistor R17, the cathode of the diode D5, the cathode of the diode D6, the first end of the resistor R21, the first end of the capacitor C16, the first end of the resistor R19, the first end of the resistor R20 and the power pin of the DAC chip form a common point as the power end of the LED driving unit, the second end of the resistor R17, the first end of the resistor R18, the cathode of the voltage-stabilizing diode Z3 and the PWM input end of the DAC chip form a common point as the input end of the LED driving unit, the second end of the resistor R18, the anode of the voltage-stabilizing diode Z3, the second end of the capacitor C16, the TM end of the DAC chip and the ground end of the DAC chip are connected to the signal ground, and the analog signal input end of the DAC chip The capacitor C14 is connected to the signal ground, the second end of the resistor R21 is connected to the first end of the capacitor C17, the second end of the capacitor C17, the anode of the diode D5, the anode of the diode D6 and the first end of the inductor L2 are commonly connected to the drain end of the built-in MOS of the DAC chip, the second end of the inductor L2 and the first end of the capacitor C15 are connected to the first input end of the second transformer, the current sampling input end of the DAC chip, the second end of the resistor R19, the second end of the resistor R20 and the second end of the capacitor C15 are commonly connected to the second input end of the second transformer, and the first output end and the second output end of the second transformer serve as the first output end and the second output end of the LED driving unit to output a constant current driving signal to drive the LED light source.

5. The LED dimming and color adjustment circuit according to claim 1, characterized in that: The DC-DC conversion unit comprises: Resistor R6, voltage stabilizing diode Z1, resistor R7, capacitor C6, capacitor C7, second switch tube, third switch tube, capacitor C10, resistor R8, resistor R9, capacitor C8, capacitor C9 and voltage stabilizing chip; The first end of the resistor R6 and the current input end of the second switch tube form a common point as the power supply end of the DC-DC conversion unit, the second end of the resistor R6 and the cathode of the voltage regulator diode Z1 are connected to the control end of the second switch tube, the current output end of the second switch tube, the first end of the capacitor C6, the first end of the capacitor C7, the first end of the resistor R7 and the current input end of the third switch tube form a common point as the first output end of the power supply unit, the control end of the third switch tube, the first end of the capacitor C10 and the second end of the resistor R7 are connected to the voltage regulator chip The cathode of the voltage stabilizing chip, the second end of the capacitor C10, the first end of the resistor R8 and the first end of the resistor R9 are commonly connected to the control end of the voltage stabilizing chip, the current output end of the third switch tube, the second end of the resistor R8, the first end of the capacitor C8 and the first end of the capacitor C9 form a common point as the second output end of the DC-DC conversion unit, the anode of the voltage stabilizing diode Z1, the second end of the capacitor C6, the second end of the capacitor C7, the anode of the voltage stabilizing chip, the second end of the resistor R9, the second end of the capacitor C8 and the second end of the capacitor C9 are commonly connected to the signal ground.

6. The LED dimming and color adjustment circuit according to claim 5, characterized in that: The second switch tube and the third switch tube are both NPN type transistors, the collector of the NPN type transistor is the current input end of the second switch tube and the third switch tube, the emitter of the NPN type transistor is the current output end of the second switch tube and the third switch tube, and the base of the NPN type transistor is the control end of the second switch tube and the third switch tube.

7. The LED dimming and color adjustment circuit according to claim 1, characterized in that: The pulse width modulation unit comprises: PWM regulation chip, resistor R16, capacitor C13; The first end of the resistor R16 and the power supply end of the PWM regulation chip form a common point as the power supply end of the pulse width modulation unit, the input signal sampling pin of the PWM regulation chip serves as the input end of the pulse width modulation unit, the second end of the resistor R16 and the first end of the capacitor C13 are commonly connected to the reset pin of the PWM regulation chip, the capacitor C13 and the ground end of the PWM regulation chip are commonly connected to the signal ground, and the multiple PWM signal output ends of the PWM regulation chip are the multiple output ends of the pulse width modulation unit.

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