A dual-line dimming and color adjustment control circuit and its driving power supply

Abstract

The present invention discloses a two-wire dimming and color adjustment control circuit, which is used to be connected to the positive and negative ends of two load light strings, and includes a dimming and color adjustment signal module, a color adjustment processing module, a color adjustment driving module, a dimming processing module, and a dimming and color adjustment conversion module, which are used to adjust the mixed color temperature or mixed spectrum of two groups of lamp beads. By setting the color adjustment processing module, only one pulse width modulation signal is needed to adjust the color temperature, and no other settings are required at the signal output end, thereby reducing the complexity of the system.

Description

Technical Field

[0001] The invention relates to the field of lighting LED driving power supplies, and in particular to a two-wire dimming and color adjustment control circuit and a driving power supply thereof. Background Art

[0002] With the development of LED technology, LED technology has also been widely used in lighting, and "dimmable" is a very important advantage of LED light sources over traditional light sources. It can not only achieve dimming, but also achieve dimming and color adjustment based on traditional light sources due to its small size. Dimming and color adjustment is currently the most widely used function of LED lamps.

[0003] Dimming and color adjustment is to adjust the color temperature and brightness of LED lamps. Most lamps currently use a three-wire two-color temperature configuration for color temperature adjustment. By adjusting the current on each color temperature channel, the brightness of two LEDs with different color temperatures is adjusted, and the difference in brightness is mixed into a new color temperature, thereby achieving the purpose of color temperature adjustment. The color temperature is currently mostly adjusted by fixed color temperature adjustment such as toggle switches, or by using the dual MOSFET inside the existing chip to drive two channels, and using a three-wire method to adjust the color temperature under the premise of fixed brightness. In the above-mentioned existing technical solutions, the modification of the three-wire color temperature adjustment method in the existing project is bound to increase costs and difficult construction. As for dimming, most of them currently use PWM or 0-10V signals to transmit PWM signals to the primary side through optocouplers for dimming. However, due to the low transmission ratio range of optocouplers and their high sensitivity to temperature, dimming is difficult at high temperatures.

[0004] In view of the above problems, how to solve the high cost of three-wire color temperature adjustment and dimming problem, the existing LED driver power supply needs to be improved and enhanced. Summary of the invention

[0005] In view of this, the present invention provides a two-wire dimming and color adjustment control circuit and a driving power supply thereof, which are used to solve the problem of high cost of three-wire dimming and color temperature adjustment in the prior art. The purpose of color temperature adjustment is achieved by outputting loads in reverse parallel and combining the control of the switching time of two groups of LEDs, so as to achieve low cost, small space and simple wiring.

[0006] The overall application concept of the present invention is: a two-wire dimming and color adjustment control circuit uses an isolated or non-isolated topology. In order to solve the problems of high cost and complex wiring of three-wire color temperature adjustment, the present application cancels the traditional two-color temperature three-wire solution, and adopts a reverse series-parallel connection method for the LED at the output end. By adjusting the conduction time of each path to the required color temperature, multi-color temperature switching is achieved.

[0007] According to the general application concept of the invention, the technical solution is provided as follows:

[0008] A two-wire dimming and color adjustment control circuit is used to connect light string A and light string B to control their color temperature and brightness. It includes a dimming and color adjustment signal module, a color adjustment processing module, a color adjustment driving module, a dimming processing module, and a dimming and color adjustment conversion module.

[0009] The dimming and color adjustment signal module is respectively connected to the color adjustment processing module and the dimming processing module, and is used to respectively process the dimming and color adjustment pulse width modulation signals issued by the dimming and color adjustment signal module. The color adjustment driving module includes a positive terminal and a negative terminal, which are used to respond to the control signal issued by the color adjustment processing module, and then control the light string A and light string B connected to the color adjustment driving module. The positive terminal is connected to one end of the light string A and light string B, and the negative terminal is connected to the other end of the light string A and light string B.

[0010] The dimming processing module processes the dimming pulse width modulation signal emitted by the dimming color adjustment signal module, and the dimming conversion module is used to transmit the dimming pulse width modulation signal between the secondary side and the primary side of the isolated power supply. It includes a primary side dimming conversion module and a secondary side color adjustment conversion module. The primary side dimming conversion module is used to transmit the dimming pulse width modulation signal from the secondary side of the isolated power supply to the primary side, and the secondary side color adjustment conversion module is used to transmit the color adjustment pulse width modulation signal from the primary side of the isolated power supply to the secondary side.

[0011] A two-wire dimming and color adjustment driving power supply comprises the dimming and color adjustment control circuit.

[0012] The beneficial effects that can be achieved by the above technical solution provided by the present invention are as follows:

[0013] 1. The present invention cancels the traditional three-wire multi-color temperature solution and adopts a special driving circuit to control the conduction sequence between light string A and light string B through a two-wire method, thereby controlling the on and off of lamp beads with different color temperatures / wavelengths respectively. The color temperature / spectrum is adjusted by adjusting the pulse width of the color modulation pulse width modulation signal. The pulse width signal with different duty cycles is adjusted to achieve different color temperatures / spectra. The two-wire method is not only convenient for construction, but also reduces the wiring cost;

[0014] 2. By setting the color adjustment processing module, only a pulse width modulation signal is needed to adjust the color temperature, and no other settings are required at the signal output end, reducing the complexity of the system.

[0015] 3. The dimming conversion module realizes the isolated driving power supply. When designing the dimming input signal, there is no need to consider whether the dimming signal is placed on the secondary side or the primary side, which solves the compatibility of the power supply dimming and improves the scalability of the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 A structural diagram of a dual-line dimming and color adjustment control circuit provided by an embodiment of the present invention;

[0018] Figure 2 A line dimming and color adjustment control circuit diagram provided by an embodiment of the present invention;

[0019] Among them, the following are marked in the figure: 1. dimming and color adjustment signal module; 2. color adjustment processing module; 3. color adjustment drive module; 4. dimming processing module; 5. dimming conversion module; 501. primary side dimming conversion module; 4. secondary side dimming conversion module. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 The present invention discloses a two-wire dimming and color adjustment control circuit and its driving power supply. The two-wire dimming and color adjustment control circuit provided by the present invention can be connected to the LED load according to the actual needs or choices of the user, using the positive and negative poles of the light string A and the light string B in reverse parallel connection, the single color temperature access circuit method, or the dual color temperature light string in parallel connection in the same direction. For example, the light string A can select lamp beads with a wavelength of 430nm to 490nm, and the light string B can select lamp beads with a wavelength of 600nm to 660nm; the light string A can select lamp beads with a color temperature of 2500K to 3000K, and the light string B can select lamp beads with a color temperature of 4000K to 6000K.

[0022] In the above-mentioned two-wire dimming and color adjustment control circuit, the color adjustment control circuit includes a dimming and color adjustment signal module 1, a color adjustment processing module 2, a color adjustment driving module 3, a dimming processing module 4, and a dimming and color adjustment conversion module 5. The dimming and color adjustment signal module 1 is connected to the color adjustment processing module 2, and the color adjustment driving module 3 is connected to the color adjustment processing module 2. The color adjustment driving module 3 includes two output terminals, which are a positive terminal and a negative terminal. When the user selects different light strings as reverse parallel connection, the positive pole of the light string A and the negative pole of the light string B are connected to the positive terminal of the color adjustment driving module 3, and the negative pole of the light string A and the positive pole of the light string B are connected to the negative terminal of the color adjustment driving module 3, and the positive and negative poles of the light string A and the light string B can be swapped. The color adjustment processing module 2 is used to process the color adjustment pulse width signal sent from the dimming and color adjustment signal module 1, split the signal into a pair of differential pulse width signals, and transmit the pair of differential pulse width signals to the color adjustment driving module 3. The color adjustment driving module 3 has two N-channel MOS-FET Gate terminals for receiving signals. The pair of differential pulse width signals are respectively transmitted to the Gate terminals of the two N-Channel MOS-FETs. The drain-source terminals of the two N-Channel MOS-FETs are respectively turned on. When one of them is turned on, the other drain-source terminal is turned off and turned on. The positive terminal and the negative terminal of the color adjustment driving module 3 are respectively controlled by the two N-Channel MOS-FETs, and the light strings A and B connected to the color adjustment driving module 3 are correspondingly controlled. When the user selects different light strings to be connected in parallel in the same direction, it is only necessary to turn off and on the drain-source end of the N-Channel MOS-FET controlling the negative end in the color adjustment driving module 3, that is, the signal of the color adjustment processing module 2 is only effective for turning on and off the drain-source end of the N-Channel MOS-FET controlling the positive end.

[0023] The dimming and color adjustment signal module 1 mentioned above in this embodiment can not only adjust the color temperature or spectrum of the output LED light string, but also adjust its light intensity. Therefore, the dimming and color adjustment signal module 1 can output at least two pulse width modulation signals, one for adjusting the color temperature or spectrum, and the other for adjusting the light intensity. When the driving power supply based on the control system also requires multiple color temperatures or spectrums, the pulse width modulation signal output by the dimming and color adjustment signal module 1 can also be increased accordingly to meet the number of corresponding output circuits.

[0024] The dimming and color adjustment signal module 1 can be installed on the primary side of the flyback driving power supply according to specific needs. Therefore, the dimming pulse width modulation signal in the dimming and color adjustment signal module 1 can be directly transmitted to the control chip of the primary side through the dimming processing module 4, which is used to control the output power and then control the light intensity of the load; and the color adjustment pulse width modulation signal in the dimming and color adjustment signal module 1 needs to be transmitted to the secondary side through the primary side, so the signal is transmitted to the color adjustment processing module 2 through the secondary side dimming conversion module 502. When the dimming and color adjustment signal module is installed on the primary side of the power supply, it can adopt a wireless transmission method to realize the output of the dimming and color adjustment signal.

[0025] The dimming and color adjustment signal module 1 can be placed on the secondary side of the flyback drive power supply according to actual needs, so the color adjustment pulse width modulation signal in the dimming and color adjustment signal module 1 can be directly transmitted to the color adjustment processing module 2 on the secondary side for controlling the color temperature or spectrum; and the dimming signal in the dimming and color adjustment signal module 1 needs to be transmitted to the primary side through the secondary side, so the dimming pulse width modulation signal is transmitted to the dimming processing module 4 through the primary side dimming conversion module 501. When the dimming and color adjustment signal module is placed on the secondary side of the power supply, it can use wired and wireless transmission methods to achieve the output of the dimming and color adjustment signal.

[0026] For further details, please refer to Figure 2 , the color adjustment processing module 2 includes a first processing module 201 and a second processing module 202, and the color adjustment driving module 3 includes a first driving module 301 and a second driving module 302. The input ends of the first processing module 201 and the second processing module 202 are connected, and are connected to the dimming and color adjustment signal module 1, the output end of the first processing module 201 is connected to the input end of the first driving module 301, and the output end of the second processing module 202 is connected to the input end of the second driving module 302. In actual use, the color adjustment pulse width modulation signal emitted by the dimming and color adjustment signal module 1 passes through the first processing module 201 to form a color adjustment differential pulse width modulation signal PWM,1, and is transmitted to the input end of the first driving module 301, passes through the second processing module 202 to form another color adjustment differential pulse width modulation signal PWM2, and is transmitted to the input end of the second driving module 302. Therefore, the color adjustment signal in the dimming and color adjustment signal module can be split into a pair of color adjustment differential pulse width modulation signals. Therefore, when the color-adjusting differential pulse width modulation signal PWM1 output by the first processing module 201 turns on the first driving module 301, the color-adjusting differential pulse width modulation signal PWM2 output by the second processing module 202 will definitely turn off the second driving module 302; when the color-adjusting differential pulse width modulation signal PWM1 output by the first processing module 201 turns off the first driving module 301, the color-adjusting differential pulse width modulation signal PWM2 output by the second processing module 202 will definitely turn on the second driving module 302.

[0027] More specifically, when it is necessary to output the duty cycle of the pulse width modulation signal of the color adjustment signal, the dimming and color adjustment signal module outputs the color adjustment pulse width modulation signal of the corresponding duty cycle according to the actual color temperature value.

[0028] Furthermore, in order to further describe the working principle of color adjustment of this embodiment, for example, the color temperature of the load light string A is 2500K~3000K lamp beads, and the color temperature of the load light string B is 4000K~6000K lamp beads, and a reverse parallel connection method is adopted, that is, the positive terminal of the first driving module 301 is respectively connected to the positive pole of the light string A and the negative pole of the light string B, and the negative terminal of the second driving module 302 is respectively connected to the negative pole of the light string A and the positive pole of the light string B. When the color temperature needs to be adjusted to 3800K, the duty cycle of the color adjustment pulse width modulation signal output by the dimming and color adjustment signal module 1 is 62%, so the duty cycle of the color adjustment pulse width modulation signal PWM1 converted to the first processing module 201 is 38%, and the duty cycle of the color adjustment pulse width modulation signal PWM2 converted to the second processing module 202 is 62%. Finally, PWM1 output by the first processing module 201 is transmitted to the first driving module 301 to control the conduction of the light string A, and PWM2 output by the second processing module 202 is transmitted to the second driving module 302 to control the conduction of the light string B. Therefore, by controlling the conduction time of different light strings, the adjustment of different color temperatures can be achieved.

[0029] Furthermore, based on the color adjustment of this embodiment, in other embodiments, for example, the wavelength of the load light string A is 450nm, and the color temperature of the load light string B is 620nm. A reverse parallel connection method is adopted, that is, the positive terminal of the first driving module 301 is respectively connected to the positive pole of the light string A and the negative pole of the light string B, and the negative terminal of the second driving module 302 is respectively connected to the negative pole of the light string A and the positive pole of the light string B. When the ratio of 450nm to 620nm in the mixed spectrum needs to be adjusted to 6:4, the duty cycle of the color-adjusting pulse width modulation signal output by the dimming and color-adjusting signal module 1 is 60%, so the duty cycle of the color-adjusting pulse width modulation signal PWM1 converted to the first processing module 201 is 40%, and the duty cycle of the color-adjusting pulse width modulation signal PWM2 converted to the second processing module 202 is 60%. Finally, PWM1 output by the first processing module 201 is transmitted to the first driving module 301 to control the conduction of the light string A, and PWM2 output by the second processing module 202 is transmitted to the second driving module 302 to control the conduction of the light string B. Therefore, by controlling the conduction time of different light strings, the adjustment of different mixed spectra can be achieved, which can be applied to the environment of simulating sunlight in the field of plant lighting.

[0030] For specific implementation, please refer to Figure 2The dimming and color adjustment signal module is placed on the secondary side of the flyback power supply. The first processing module 201 includes an inverter U5, a PNP tube Q52, an NPN tube Q53, a capacitor C52, and a resistor R50; the input end of the inverter U5 is connected to the dimming and color adjustment signal module 1, and the output end of the inverter U5 is respectively connected to the base of the PNP tube Q52 and the base of the NPN tube Q53, the collector of the PNP tube Q52 is connected to PGND, one end of the capacitor C52 is connected to the collector of the PNP tube Q52, and the other end of the capacitor C52 is connected to the emitter of the PNP tube Q52 and the collector of the NPN tube Q53. One end of the resistor R50 is connected to the secondary side DC HV, and the other end is connected to the emitter of the NPN tube Q53. The first driving module includes an NMOS tube Q51, a resistor R51, a resistor R52, and a diode D52. The emitter of the NPN tube Q53 outputs a color adjustment pulse width modulation signal PWM1 to the gate of the NMOS tube Q51. The source of the NMOS tube Q51 is connected to one end of the resistor R51, the anode of the diode D52, and the positive terminal. The other end of the resistor R51 is connected to the cathode of the diode D52 and one end of the resistor R52. The other end of the resistor R52 is connected to PGND.

[0031] The second processing module 202 includes a PNP tube Q54, an NPN tube Q55, and a capacitor C53; the base of the PNP tube Q54 is connected to the base of the NPN tube Q55 and the dimming and color adjustment signal module 1, the collector of the NPN tube Q55 is connected to the collector of the NPN tube Q53, the collector of the PNP tube Q54 is connected to PGND, one end of the capacitor C53 is connected to PGND, and the other end is connected to the emitter of the PNP tube Q54, and the emitter of the PNP tube Q54 is connected to the emitter of the NPN tube Q55. The second driving module 302 includes an NMOS tube Q56, a resistor R53, a resistor R54, and a diode D54. The emitter of the NPN tube Q55 outputs a color adjustment pulse width modulation signal PWM2 to the gate of the NMOS tube Q56. The source of the NMOS tube Q56 is connected to one end of the resistor R53, one end of the diode D54, and a negative terminal. The other end of the resistor R53 is connected to the cathode of the diode D54 and one end of the resistor R54. The other end of the resistor R54 is connected to PGND.

[0032] The frequency of a pair of differential color modulation pulse width modulation signals formed by the color modulation pulse width modulation signal PWM1 and the color modulation pulse width modulation signal PWM2 is consistent with the color modulation pulse width modulation signal frequency output by the dimming and color modulation signal module 1 .

[0033] In this embodiment, the flyback driving power supply composed of the above dimming and color adjustment control circuit is shown in FIG. Figure 2The components before the rectifier bridge of the driving power supply have been omitted. After the rectifier bridge, the primary circuit includes the primary transformer winding T1A, the starting circuit, the RCD absorption circuit, the auxiliary power supply circuit, the chip circuit, and the main power NMOS tube Q2 to form a primary dimming conversion circuit 501; the starting circuit includes a resistor R11, a diode D11, and an electrolytic capacitor C11; the RCD absorption circuit includes a diode D2, a resistor R21, and a capacitor C21; the auxiliary power supply circuit is composed of a transformer T1B winding, a resistor R12, a voltage regulator tube Z1, and an NPN tube Q1; the chip circuit includes a chip U1, a current sampling circuit, and a voltage sampling circuit; the current sampling circuit includes a resistor R61, a resistor R62, and a capacitor C61; the voltage sampling circuit includes a resistor R41, a resistor R42; the primary dimming conversion circuit 501 includes a resistor R13 and an optocoupler U2B. The secondary circuit includes a transformer T1C coil, an output diode D5, an output electrolytic capacitor C51, a diode D51, and a diode D53.

[0034] Next, combine Figure 1 and Figure 2 , the working process of a two-wire dimming and color adjustment control circuit in this embodiment is described in detail:

[0035] The dimming and color adjustment signal module 1 outputs two pulse width modulation signals respectively, namely the color adjustment pulse width modulation signal and the dimming pulse width modulation signal, which are respectively used to control the color temperature (or mixed spectrum) and the light intensity of the output load; and the color adjustment pulse width modulation signal is used to control the conduction or cutoff of the light string A and the conduction or cutoff of the light string B respectively. In order to achieve this function, it is necessary to split the color adjustment pulse width modulation signal into a pair of differential color adjustment pulse width modulation signals through the color adjustment processing module 2 (when the first processing module 201 outputs a high level, the second processing module 202 outputs a low level, and when the first processing module 201 outputs a low level, the second processing module 202 outputs a high level), and then realize the staggered conduction and cutoff of the light string A and the light string B through the first driving module 301 and the second driving module 302.

[0036] When the lamp beads of light string A and light string B are 3000K and 5000K respectively, the circuit can realize the color adjustment function; when the lamp beads of light string A and light string B are 450nm and 620nm respectively, the circuit can realize the spectrum adjustment function, which can be applied to sub-sectors that are sensitive to the spectrum, such as plant lighting.

[0037] The dimming pulse width modulation signal needs to be transmitted to the primary control chip through the primary dimming conversion module 501 (composed of an optocoupler U2B and a resistor R13), and the output power is adjusted to adjust the light intensity of the light string A and the light string B.

[0038] The above are only preferred embodiments of the present invention. It should be pointed out that the above preferred embodiments should not be regarded as limitations of the present invention. Without departing from the concept of the present invention, several equivalent transformations, improvements and modifications can be made. These equivalent transformations, improvements and modifications should also be regarded as the protection scope of the present invention. The embodiments will not be repeated here. The protection scope of the present invention shall be based on the scope defined by the claims.

Claims

1. A two-wire dimming and color adjustment control circuit, used to connect to the positive and negative ends of two load light strings A and B, including: A color processing module, comprising: A first processing module, the first processing module includes an inverter U5, a PNP tube Q52, an NPN tube Q53, a capacitor C52, and a resistor R50; The input end of the inverter U5 is connected to the dimming and color adjustment signal module 1, and the output end of the inverter U5 is respectively connected to the base of the PNP tube Q52 and the base of the NPN tube Q53, the collector of the PNP tube Q52 is connected to PGND, one end of the capacitor C52 is connected to the collector of the PNP tube Q52, and the other end of the capacitor C52 is connected to the emitter of the PNP tube Q52 and the collector of the NPN tube Q53, one end of the resistor R50 is connected to the secondary DC HV, and the other end is connected to the emitter of the NPN tube Q53; A second processing module, the second processing module 202 includes a PNP tube Q54, an NPN tube Q55, and a capacitor C53; The base of the PNP tube Q54 is connected to the base of the NPN tube Q55 and the dimming and color adjustment signal module 1, the collector of the NPN tube Q55 is connected to the collector of the NPN tube Q53, the collector of the PNP tube Q54 is connected to PGND, one end of the capacitor C53 is connected to PGND, and the other end is connected to the emitter of the PNP tube Q54, and the emitter of the PNP tube Q54 is connected to the emitter of the NPN tube Q55; A dimming processing module; a dimming and color adjustment signal module, connected to the color adjustment processing module and the dimming processing module respectively, and used to process the dimming and color adjustment pulse width modulation signals sent from the dimming and color adjustment signal module respectively; A color adjustment driving module, including a positive terminal and a negative terminal, is used to be connected to both ends of the light string A and the light string B, and responds to the pulse width modulation signal sent by the color adjustment processing module to adjust the mixed color temperature or mixed spectrum of the two groups of lamp beads, which includes: A first driving module 301, the first driving module includes an NMOS tube Q51, a resistor R51, a resistor R52, and a diode D52, the emitter of the NPN tube Q53 outputs a color adjustment pulse width modulation signal PWM1 to the gate of the NMOS tube Q51, the source of the NMOS tube Q51 is connected to one end of the resistor R51, the anode of the diode D52, and the positive terminal, the other end of the resistor R51 is connected to the cathode of the diode D52 and one end of the resistor R52, and the other end of the resistor R52 is connected to PGND; The second driving module 302 includes an NMOS tube Q56, a resistor R53, a resistor R54, and a diode D54. The emitter of the NPN tube Q55 outputs a color adjustment pulse width modulation signal PWM2 to the gate of the NMOS tube Q56. The source of the NMOS tube Q56 is connected to one end of the resistor R53, one end of the diode D54, and a negative terminal. The other end of the resistor R53 is connected to the cathode of the diode D54 and one end of the resistor R54. The other end of the resistor R54 is connected to PGND. And, a dimming and color conversion module, comprising: A primary dimming conversion module, which is used to transmit the dimming pulse width modulation signal output by the dimming color adjustment signal module 1 to the primary side of the flyback power supply when the dimming color adjustment signal module 1 is placed on the secondary side of the flyback power supply; The secondary side color adjustment conversion module is used to transmit the color adjustment pulse width modulation signal output by the dimming color adjustment signal module 1 to the secondary side of the flyback power supply when the dimming color adjustment signal module 1 is placed on the primary side of the flyback power supply.

2. A two-wire dimming and color adjustment control circuit according to claim 1, characterized in that: The dimming and color adjustment signal module can be placed on the primary side or the secondary side in the flyback power supply, and can output two or more pulse width modulation signals; If the dimming and color adjustment signal module 1 is placed on the primary side of the flyback power supply, it uses a wireless transmission method to achieve the output of the dimming and color adjustment signal; If the dimming and color adjustment signal module 1 is placed on the secondary side of the flyback power supply, it uses a wireless or wired transmission method to achieve the output of the dimming and color adjustment signal.

3. A two-wire dimming and color adjustment control circuit according to claim 1, characterized in that: The first processing module 201 of the color adjustment processing module 2 outputs a color adjustment differential pulse width modulation signal PWM1, and the second processing module 202 outputs a color adjustment differential pulse width modulation signal PWM2. The PWM1 and PWM2 constitute a pair of differential color adjustment pulse width modulation signals.

4. A two-wire dimming and color adjustment control circuit according to claim 3, characterized in that: A pair of differential color modulation pulse width modulation signals, the pulse width modulation frequency is consistent with the color modulation pulse width modulation signal frequency emitted by the dimming and color modulation signal module 1.

5. A two-wire dimming and color adjustment driving power supply, comprising a PCB, characterized in that: The PCB is provided with a two-wire dimming and color adjustment control circuit as described in any one of claims 1 to 4.

Images