A three-wire to two-wire LED controller and method

Abstract

The invention relates to an LED three-wire to two-wire controller and method, comprising an LED lamp, an LED three-wire controller, a control unit MCU and a voltage stabilizer; a PWM signal of the LED three-wire controller is sampled by an optical coupler, and after the sampled PWM signal is returned, the signal of the three-wire controller is converted into signals PWM*W and PWM*C of a two-wire controller, and the control unit MCU controls the brightness and color temperature of LED1 and LED2 by controlling the duty ratio of PWM*W and PWM*C; the original LED three-wire controller is connected to the LED three-wire to two-wire controller of the invention, and directly connected to a two-wire LED light bar or light belt or other two-wire LED lamp, so that the function of the three-wire to two-wire controller can be realized, without modifying the structure of the original LED lamp three-wire controller and the LED lamp, thereby reducing manufacturing costs, saving labor costs and labor, and improving work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of LED lighting, and more specifically to an LED three-wire to two-wire controller and method. Background Art

[0002] Existing LED lamps have been increasingly widely used in areas such as building lighting and garden lighting due to their long service life, energy saving, environmental protection and pure color.

[0003] Since LED three-wire controllers appeared early, they are widely used.

[0004] Advantages of LED three-wire controller: Since PWM is independently controlled and does not affect each other, dimming and color adjustment are easy to control, and the range of dimming and color adjustment is relatively wide.

[0005] Disadvantages: Since three wires are required for control, the LED light belt or light strip will be made wider, which is not conducive to installation. The light belt or light strip requires three wires, and the cost is relatively more expensive than a two-wire light belt or light strip.

[0006] LED two-wire controllers appeared later than LED three-wire controllers, but their applications are becoming more and more widespread.

[0007] Advantages: Only two wires are needed for control, LED light strips or light bars can be made narrower, easier to install, and not easy to install. Light strips or light bars only need two wires, and the cost is relatively cheaper than three-wire light strips or light bars.

[0008] The existing technology LED three-wire controller is not compatible with the two-wire controller. After installing the three-wire controller, you can only connect to the three-wire light strip or light belt and its three-wire lamps. If you want to install the two-wire light strip or light strip and its two-wire lamps, you must remove the original three-wire controller line, which wastes manpower, material resources, financial resources and time.

[0009] When a three-wire LED controller has been previously arranged in a decoration venue or lighting venue, and is ready to be connected to a three-wire light strip / light bar or other three-wire LED lamps, but due to insufficient space or shortage of three-wire light strips / light bars or other reasons, it is necessary to convert to a two-wire light strip / light bar or other two-wire LED lamps, the previous practice is to dismantle the previously arranged three-wire LED controller and its lines, and then convert to a two-wire controller and its lines, which is extremely time-consuming and cost-intensive.

[0010] Therefore, it is necessary to develop a three-wire to two-wire controller and method for LEDs. Summary of the invention

[0011] The technical problem to be solved by the present invention is to provide an LED three-wire to two-wire controller and method, which solves the problem of realizing a three-wire to two-wire controller and control method without modifying the structure of the LED lamp and the three-wire controller, thereby reducing labor costs and improving work efficiency.

[0012] In order to solve the above technical problems, the present invention relates to an LED three-wire to two-wire controller and method, including an LED lamp, an LED three-wire controller, a control unit MCU and a voltage stabilizer; the PWM signal of the LED three-wire controller is connected to an optocoupler, isolated by the optocoupler, and then the PWM signal is reversely amplified through NMOS tubes Q7 and Q8 to be converted into two pulse width modulation signals PWM1 and PWM2 of VDD voltage, the two pulse width modulation signals PWM1 and PWM2 are connected to two IO interfaces provided by the control unit MCU, the control unit MCU samples the two pulse width modulation signals PWM1 and PWM2, reads the period and duty cycle of PWM1 and PWM2, and converts them into two pulse width modulation signals PWM*W and PWM*C, PWM*W and PWM*C are voltage reverse signals, and the brightness and color temperature of the two-wire dual-color temperature light strips L1 and L2 are controlled by controlling the duty cycle of PWM*W and PWM*C;

[0013] The control method of the LED three-wire to two-wire controller is as follows:

[0014] a. Connect the LED three-wire controller and the voltage regulator to the power supply respectively, and connect the three output interfaces of the LED three-wire controller to L+, L1-, and L2- of the LED three-wire to two-wire controller respectively.

[0015] b. The three-wire dual-color temperature light strips L+, L1-, and L2- of the LED three-wire to two-wire controller are connected to the optical coupler U3 and the optical coupler U4 respectively;

[0016] c. When the LED three-wire controller needs the LED lamp connected to L+ and L1- to light up, the control unit MCU controls the PWM of the LED lamp to be high level, the internal NMOS is turned on, the potential of L1- is GND, the internal LED of the photocoupler U3 is illuminated, the internal transistor of the photocoupler is turned on, the gate of Q7 is low potential and not turned on, and PWM1 is high level VDD;

[0017] d. When the LED three-wire controller requires that the LED light bar connected to L+ and L1- is not lit, the control unit MCU controls the PWM of the light bar to be low level, the internal NMOS is not turned on, L1- to GND is disconnected, and a loop cannot be formed. The internal LED of the photocoupler U3 does not emit light, the internal transistor of the photocoupler is not turned on, the gate of Q7 is high potential, Q7 is NMOS, turned on, and PWM1 is low level;

[0018] e. The control unit MCU converts the signals of PWM1 and PWM2 into LED two-line controller signals PWM*W and PWM*C according to the algorithm, and the PWM*W and PWM*C drive the LED; f. That is, when the PWM*W is at a high level, Q1 is turned on, R1 and R2 are divided, Q2 and Q3 are PMOS, and there is a certain potential difference between the G and S terminals. Q2 is turned on, and at this time PWM*C is at a low level, Q1, Q4, Q5 and Q6 are NMOS, not conducting, W+ potential is VCC2, similarly Q3 is not conducting, Q5 is conducting, C+ potential is GND, and L1 is lit; g. When the PWM*W is at a low level, Q1 is not conducting, Q2 is PMOS, and the G and S terminals have the same potential, Q2 is not conducting, and at this time PWM*C is at a high level, Q6 is NMOS, turned on, W+ potential is GND, similarly Q3 is turned on, Q5 is not conducting, C+ potential is VCC2, and L2 is lit;

[0019] h. Repeat the above steps a to g, control the duty cycle of PWM*W and PWM*C to control the brightness and color temperature of L1 and L2; i. The two ports L1 and L2 of the LED three-wire to two-wire controller are directly connected to the two-wire LED lamps to realize the three-wire to two-wire controller, thereby controlling the brightness and color temperature of the LED; j. Q1 and Q4 reverse the signals of PWM*W and PWM*C to drive the two PMOS Q2 and Q3;

[0020] k. The W+ and C+ are connected to two interfaces of the two-wire dual-color temperature lamp;

[0021] g. Q7 and Q8 reverse and amplify the signal output by the optocoupler and output it to the control unit MCU, so that the control unit MCU samples the signal of the LED three-wire controller.

[0022] A further solution is that the PWM*W and PWM*C control circuits have dead time.

[0023] A further solution is that the PWM1 samples the PWM signal of the LED three-wire controller and outputs a corresponding LED two-wire control PWM signal.

[0024] A further solution is that the PWM2 samples the PWM signal of the LED three-wire controller and outputs a corresponding LED two-wire control PWM signal.

[0025] A further solution is that the voltage regulator is a low dropout linear regulator LDO.

[0026] A further solution is that the control unit MCU is a single chip microcomputer.

[0027] A further solution is that the LED lamp three-wire to two-wire controller and the LED three-wire controller are both connected to corresponding power supplies at the same time.

[0028] A further solution is that the LED lamp includes an LED light belt, an LED light bar or other LED lamps.

[0029] The beneficial effect of the present invention compared with the prior art is: the original LED three-wire controller is connected to the LED three-wire to two-wire controller of the present invention, and then it can be directly connected to a two-wire LED light bar or light belt or other two-wire LED lamps, thereby realizing the function of the three-wire to two-wire controller, without modifying the structure of the original LED lamp three-wire controller and the LED lamp, thereby reducing manufacturing costs, saving labor costs and labor, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a circuit diagram of the LED three-wire to two-wire controller of the present invention;

[0031] Figure 2 It is a schematic diagram of the working principle of the LED three-wire controller of the present invention;

[0032] Figure 3 It is a circuit diagram of the LED three-wire controller of the present invention;

[0033] Figure 4 It is a schematic diagram of the working principle of the LED two-wire controller of the present invention;

[0034] Figure 5 Schematic diagram of the circuit of the LED two-wire controller of the present invention. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figures 1 to 5 As shown, a specific embodiment of the present invention is a three-wire LED to two-wire controller and method, including an LED lamp, an LED three-wire controller, a control unit MCU and a voltage stabilizer; the PWM signal of the LED three-wire controller is connected to an optocoupler, isolated by the optocoupler, and then the PWM signal is reversely amplified by NMOS tubes Q7 and Q8, and converted into two pulse width modulation signals PWM1 and PWM2 of VDD voltage, the two pulse width modulation signals PWM1 and PWM2 are connected to two IO interfaces provided by the control unit MCU, the control unit MCU samples the two pulse width modulation signals PWM1 and PWM2, reads the period and duty cycle of PWM1 and PWM2, and converts them into two pulse width modulation signals PWM*W and PWM*C, PWM*W and PWM*C are voltage reverse signals, and the brightness and color temperature of the two-wire dual-color temperature light strips L1 and L2 are controlled by controlling the duty cycle of PWM*W and PWM*C;

[0037] The control method of the LED three-wire to two-wire controller is as follows:

[0038] a. Connect the LED three-wire controller and the voltage regulator to the power supply respectively, and connect the three output interfaces of the LED three-wire controller to L+, L1-, and L2- of the LED three-wire to two-wire controller respectively.

[0039] b. The three-wire dual-color temperature light strips L+, L1-, and L2- of the LED three-wire to two-wire controller are connected to the optical coupler U3 and the optical coupler U4 respectively;

[0040] c. When the LED three-wire controller needs the LED lamp connected to L+ and L1- to light up, the control unit MCU controls the PWM of the LED lamp to be high level, the internal NMOS is turned on, the potential of L1- is GND, the internal LED of the photocoupler U3 is illuminated, the internal transistor of the photocoupler is turned on, the gate of Q7 is low potential, Q7 is NMOS, not turned on, and PWM1 is high level VDD;

[0041] d. When the LED three-wire controller requires that the LED light bar connected to L+ and L1- is not lit, the control unit MCU controls the PWM of the light bar to be low level, the internal NMOS is not turned on, L1- to GND is disconnected, and a loop cannot be formed. The internal LED of the photocoupler U3 does not emit light, the internal transistor of the photocoupler is not turned on, the gate of Q7 is high potential, Q7 is NMOS, turned on, and PWM1 is low level;

[0042] e. The control unit MCU converts the PWM1 and PWM2 signals into LED two-wire controller signals PWM*W and PWM*C according to the algorithm. The PWM*W and PWM*C drive the LED. There are many algorithms for converting three wires to two wires. Here is one algorithm:

[0043] If (PWM1+PWM2=M) / / M>100

[0044] {PWM*C=PWM1*100 / M; PWM*W=PWM2*100 / M;}

[0045] Else if(PWM1+PWM2=M) / / M<=100

[0046] {PWM*C=PWM1; PWM*W=M-PWM1;};

[0047] f. That is, when PWM*W is high, Q1 is turned on, R1 and R2 divide the voltage, Q2 and Q3 are PMOS, G and S terminals have a certain potential difference, Q2 is turned on, and at this time PWM*C is low, Q1, Q4, Q5 and Q6 are NMOS, not turned on, W+ potential is VCC2, similarly Q3 is not turned on, Q5 is turned on, C+ potential is GND, L1 lights up;

[0048] g. When PWM*W is low, Q1 is not conducting, Q2 is PMOS, and the G and S terminals have the same potential, Q2 is not conducting, while PWM*C is high, Q6 is NMOS, conducting, W+ potential is GND, similarly Q3 is conducting, Q5 is not conducting, C+ potential is VCC2, and L2 is lit;

[0049] h. Repeat steps a to g above to control the duty cycle of PWM*W and PWM*C to control the brightness and color temperature of L1 and L2;

[0050] i. The two ports L1 and L2 of the LED three-wire to two-wire controller are directly connected to two-wire LED lamps to realize the three-wire to two-wire controller, thereby controlling the brightness and color temperature of the LED;

[0051] j. The Q1 and Q4 reverse the PWM*W and PWM*C signals to drive the two PMOSs Q2 and Q3;

[0052] k. The W+ and C+ are connected to two interfaces of the two-wire dual-color temperature lamp;

[0053] g. Q7 and Q8 reverse and amplify the signal output by the optocoupler and output it to the control unit MCU, so that the control unit MCU samples the signal of the LED three-wire controller.

[0054] Furthermore, the PWM*W and PWM*C control circuits have a certain dead time

[0055] Furthermore, PWM1 samples the PWM signal of the LED three-wire controller and outputs a corresponding LED two-wire control PWM signal.

[0056] Furthermore, PWM2 samples the PWM signal of the LED three-wire controller and outputs a corresponding LED two-wire control PWM signal.

[0057] Furthermore, the voltage regulator is a low dropout linear regulator LDO.

[0058] Furthermore, the control unit MCU is a single chip microcomputer.

[0059] Furthermore, the LED lamp three-wire to two-wire controller and the LED three-wire controller are both connected to corresponding power supplies at the same time.

[0060] Furthermore, the LED lamp includes an LED light belt, an LED light bar or other LED lamps.

[0061] This embodiment uses LED light strips or light bars as specific implementation methods, as follows:

[0062] The current common three-wire controller principle of LED light strips or light bars is as follows Figure 2 As shown, VCC is generally 12V or 24V, and LDO steps down the voltage to supply power to the control unit MCU. The two IO ports PWM1 and PWM2 of the control unit MCU (single-chip microcomputer) independently control MOS tubes Q1 and Q2 respectively. When PWM1 is at a high level, Q1 is turned on and LED1 is on; when PWM1 is at a low level, Q1 is not turned on and LED1 is off. Similarly, when PWM2 is at a high level, Q2 is turned on and LED2 is on; when PWM2 is at a low level, Q2 is not turned on and LED2 is off. The control unit MCU can light up one color of the light or both lights at a time according to user needs. The PWM duty cycle controls the brightness of the light, such as Figure 1 shown.

[0063] LED light strip or light bar three-wire controller product circuit Figure 3 As shown in the figure, you can see the power interface (VCC, GND), the interface L+, L1-, L2- of the LED light bar or light strip, and it may also be named something else. The interface of the LED light bar or light strip has just three wires, so it is called a three-wire controller. The interface is connected to the light strip or light strip to achieve Figure 3 control circuit.

[0064] The principle and circuit of the three-wire to two-wire controller for LED light strips or light bars Figure 1 As shown, Figure 1 The LED three-wire controller shown on the left is the Figure 3 The LED three-wire controller circuit diagram is shown in the figure. Since the LED three-wire controller and the three-wire to two-wire controller of this LED lamp do not share the same ground and cannot form a loop, it is necessary to use a photocoupler to collect the LED three-wire control PWM signal. After L+, L1-, and L2- are connected to the photocouplers U3 and U4, the LED three-wire controller realizes the function of a three-wire controller.

[0065] When the LED three-wire controller needs the LED light bar connected to L+ and L1- to light up, the control unit MCU controls the PWM of this light bar to be high level, the internal NMOS is turned on, the L1- potential is GND, the internal LED of the photocoupler U3 lights up, the internal transistor of the photocoupler is turned on, the gate of Q7 is low potential, Q7 is NMOS, not turned on, PWM1 is high level VDD, which is consistent with the PWM potential of the LED three-wire controller; similarly, when the LED three-wire controller needs the LED light bar connected to L+ and L1- not to light up, the control unit MCU controls this The PWM of the light strip is at a low level, the internal NMOS is not turned on, L1- to GND is disconnected, and a loop cannot be formed. The internal LED of the photocoupler U3 does not emit light, the internal transistor of the photocoupler is not turned on, the gate of Q7 is at a high potential, Q7 is an NMOS, turned on, and PWM1 is at a low level, which is consistent with the PWM potential of the LED three-wire controller. In this way, the function of PWM1 sampling the PWM signal of the LED three-wire controller to control L+ and L1- is realized. The same principle can also realize the function of PWM2 sampling the PWM signal of the LED three-wire controller to control L+ and L2-.

[0066] After the PWM1 and PWM2 of the control unit MCU sample the PWM signal of the LED three-wire controller and return it, the signal of the three-wire controller can be translated into the signal PWM*W and PWM*C of the two-wire controller according to the algorithm. The working principle of PWM*W and PWM*C controlling Q1, Q2, Q3, Q4, Q5, and Q6 is as follows: Figure 4 and Figure 5 The principle and circuit of the existing LED two-wire controller shown are the same, thereby realizing the function of converting the LED three-wire to two-wire controller.

[0067] As mentioned above, Figure 1 L1 and L2 shown are connected to two-wire LED light strips or light belts. When the LED three-wire controller is activated, the two-wire light strips or light belts can be lit accordingly, thus realizing the function of converting LED three-wire to two-wire.

[0068] The installation method of the present invention is as follows: the original LED three-wire controller has three output interfaces L+, L1-, and L2-, which are respectively used to connect three-wire LED light strips or light bars or other LED lamps, and these three interfaces are directly connected to the corresponding three access ports of the LED lamp three-wire to two-wire controller. The two access ports L1 and L2 are directly connected to the two-wire light strips or light bars and other two-wire LED lamps. The operation is very simple. Both the LED three-wire controller and the LED lamp three-wire to two-wire controller need to be connected to a power supply.

[0069] The problems solved by the present invention and the beneficial effects are as follows:

[0070] The present invention connects the original LED three-wire controller to the LED three-wire to two-wire controller of the present invention, and can directly connect to a two-wire LED light bar or light belt or other two-wire LED lamps, thereby realizing the function of the three-wire to two-wire controller, without modifying the structure of the original LED lamp three-wire controller and the LED lamp, thereby reducing manufacturing costs, saving labor costs and labor, and improving work efficiency.

[0071] The above description is only the preferred implementation mode of this patent and does not limit the scope of this patent. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings, directly or indirectly used in other related technical fields, falls within the scope of protection of this patent.

Claims

1. A control method for a three-wire to two-wire LED controller, characterized in that: It includes an LED lamp, an LED three-wire controller, a control unit MCU and a voltage stabilizer; the PWM signal of the LED three-wire controller is connected to an optocoupler, isolated by the optocoupler, and then the PWM signal is reversely amplified through NMOS tubes Q7 and Q8 to be converted into two pulse width modulation signals PWM1 and PWM2 of VDD voltage, the two pulse width modulation signals PWM1 and PWM2 are connected to two IO interfaces provided by the control unit MCU, the control unit MCU samples the two pulse width modulation signals PWM1 and PWM2, reads the period and duty cycle of PWM1 and PWM2, and converts them into two pulse width modulation signals PWM*W and PWM*C, the PWM*W and PWM*C are voltage reverse signals, and the brightness and color temperature of the two-wire dual-color temperature light strips of the L1 and L2 interfaces are controlled by controlling the duty cycle of PWM*W and PWM*C; The control method of the LED three-wire to two-wire controller is as follows: a. Connect the LED three-wire controller and the voltage regulator to the power supply respectively, and connect the three output interfaces of the LED three-wire controller to the L+, L1-, and L2- interfaces of the LED three-wire to two-wire controller respectively; b. The three interfaces L+, L1-, and L2- of the LED three-wire to two-wire controller are connected to the optical coupler U3 and the optical coupler U4 respectively; c. When the LED three-wire controller needs to light up the LED lamp connected to the L+ and L1- interfaces, the L+ potential is VCC, the L1- potential is GND, the LED inside the photocoupler U3 lights up, the internal transistor of the photocoupler U3 is turned on, the gate of the NMOS tube Q7 is at a low potential and is not turned on, and PWM1 is at a high level VDD; d. When the LED three-wire controller needs to turn off the LED lamp connected to the L+ and L1- interfaces, the L+ potential is VCC, the L1- potential is also VCC, the L1- to GND is disconnected, and a loop cannot be formed. The LED inside the photocoupler U3 does not emit light, the internal transistor of the photocoupler U3 is not turned on, the gate of the NMOS tube Q7 is high potential, turned on, and PWM1 is low level; e. The control unit MCU converts the PWM1 and PWM2 signals into LED two-line controller signals PWM*W and PWM*C according to the algorithm, and the PWM*W and PWM*C are signal sources to drive the two-line LED; f. That is, when the PWM*W is at a high level, the NMOS tube Q5 is turned on, the NMOS tube Q1 is turned on, the resistors R1 and R2 divide the voltage, the G and S terminals of the PMOS tube Q2 have a potential difference, the PMOS tube Q2 is turned on, the potential of W+ between the PMOS tube Q2 and the NMOS tube Q6 is VCC2, and at this time PWM*C is at a low level, the NMOS tube Q6 is not turned on, the NMOS tube Q4 is not turned on, the G and S terminals of the PMOS tube Q3 have the same potential and are not turned on, the potential of C+ between the PMOS tube Q3 and the NMOS tube Q5 is GND, and the lamp connected to the L1 interface is lit; g. When the PWM*W is at a low level, the NMOS tube Q5 is not conducting, the NMOS tube Q1 is not conducting, the G and S terminals of the PMOS tube Q2 have the same potential and are not conducting, and the W+ potential between the PMOS tube Q2 and the NMOS tube Q6 is GND. At this time, the PWM*C is at a high level, the NMOS tube Q6 is conducting, the NMOS tube Q4 is conducting, the G and S terminals of the PMOS tube Q3 have a potential difference and are conducting, the C+ potential between the PMOS tube Q3 and the NMOS tube Q5 is VCC2, and the lamp connected to the L2 interface is lit; h. Repeat steps a to g above to control the duty cycle of the PWM*W and PWM*C to control the brightness and color temperature of the lamps connected to the L1 and L2 interfaces; i. The two nodes W+ and C+ of the LED three-wire to two-wire controller are directly connected to the two-wire LED lamps of the L1 and L2 interfaces to realize the three-wire to two-wire controller, thereby controlling the brightness and color temperature of the LED; j. NMOS tubes Q1 and Q4 reverse the signals of PWM*W and PWM*C to drive PMOS tubes Q2 and Q3; k. The W+ and C+ are two interfaces for connecting two-wire dual-color temperature lamps; g. The NMOS tubes Q7 and Q8 invert and amplify the signal output by the optocoupler, and output it to the control unit MCU, so that the control unit MCU samples the signal of the LED three-wire controller.

2. The control method of the LED three-wire to two-wire controller according to claim 1, characterized in that: The PWM*W and PWM*C control circuits have dead time.

3. The control method of the LED three-wire to two-wire controller according to claim 1, characterized in that: The PWM1 samples the PWM signal of the LED three-wire controller and outputs the corresponding LED two-wire control PWM signal.

4. The control method of the LED three-wire to two-wire controller according to claim 1, characterized in that: The PWM2 samples the PWM signal of the LED three-wire controller and outputs the corresponding LED two-wire control PWM signal.

5. The control method of the LED three-wire to two-wire controller according to claim 1, characterized in that: The algorithm is a three-line to two-line algorithm, as follows: If (PWM1+PWM2=M) / / M>100 {PWM*C=PWM1*100 / M; PWM*W=PWM2*100 / M;} Elseif(PWM1+PWM2=M) / / M<=100 {PWM*C=PWM1; PWM*W=M-PWM1;}.

6. The control method of the LED three-wire to two-wire controller according to claim 1, characterized in that: The voltage regulator is a low dropout linear regulator LDO.

7. The control method of the LED three-wire to two-wire controller according to claim 1, characterized in that: The control unit MCU is a single chip microcomputer.

8. The control method of the LED three-wire to two-wire controller according to claim 1, characterized in that: The LED lamp three-wire to two-wire controller and the LED three-wire controller are both connected to corresponding power supplies at the same time.

9. The control method of the LED three-wire to two-wire controller according to claim 1, characterized in that: The LED lamp includes an LED light belt, an LED light bar or other LED lamps.

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