A 0-10V Dimming Output Port Parallel Expansion Circuit and Its Implementation Method

Abstract

The present invention discloses a 0-10V dimming output port parallel expansion circuit, which includes a plurality of control signal serial expansion circuits and a plurality of output conversion circuits corresponding to the control signal serial expansion circuits. Among them, the control signal serial expansion circuit includes a PWM dimming driver chip U2. The 5th pin of the previous-stage PWM dimming driver chip U2 is connected to the 6th pin of the next-stage PWM dimming driver chip U2, and the 6th pin of the PWM dimming driver chip U2 at the head end is connected to the I / O interface of the microprocessor. The 1st pin of the PWM dimming driver chip U2 is connected to the input end of the corresponding output conversion circuit, and the output end of the output conversion circuit outputs a dimming signal. The present invention also discloses a method for implementing a 0-10V dimming output port parallel expansion circuit. Each output conversion circuit of the present invention is relatively independently connected to the output port of the corresponding control signal serial expansion circuit, realizing the arbitrary expansion ability of the number of independent 0-10V dimming output ports.

Description

Technical Field

[0001] The present invention belongs to the technical field of dimming circuits, and particularly relates to a 0-10V dimming output port parallel expansion circuit and an implementation method thereof. Background Art

[0002] In the field of modern electronic technology, with the popularization of intelligent lighting applications, the application of existing LED dimming control technologies has become particularly important.

[0003] Currently, in intelligent lighting control systems, 0-10V dimming signals are used in many occasions to group-dim and control on-site lamps. In actual applications, many intelligent lighting application scenarios require a large number of independent 0-10V dimming signal ports to achieve group and single-lamp control.

[0004] Currently, most intelligent dimming controller solutions with multiple 0-10V dimming signal outputs use independent PWM pins of a microprocessor to implement, but there are fewer microprocessor selection schemes corresponding to independent PWM outputs of more than six channels. In actual applications, the free expansion of the number of ports cannot be achieved due to the limitation of the number of independent PWM ports of the microprocessor. Summary of the Invention

[0005] The purpose of the present invention is to provide a 0-10V dimming output port parallel expansion circuit to solve the problems proposed in the above background art. The 0-10V dimming output port parallel expansion circuit provided by the present invention has the characteristics of flexible application, strong scalability, economy and practicality.

[0006] Another purpose of the present invention is to provide an implementation method of a 0-10V dimming output port parallel expansion circuit.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A 0-10V dimming output port parallel expansion circuit includes a plurality of control signal serial expansion circuits and a plurality of output conversion circuits corresponding to the control signal serial expansion circuits. Among them, the control signal serial expansion circuit includes a PWM dimming drive chip U2. The 5th pin of the previous-level PWM dimming drive chip U2 is connected to the 6th pin of the next-level PWM dimming drive chip U2, and the 6th pin of the PWM dimming drive chip U2 at the head end is connected to the I / O interface of the microprocessor. The 1st pin of the PWM dimming drive chip U2 is connected to the input end of the corresponding output conversion circuit, and the output end of the output conversion circuit outputs a dimming signal.

[0008] In order to provide the voltage necessary for PWM output, further in the present invention, pin 1 of the PWM dimming drive chip U2 is also connected to resistor R3, pin 2 of the PWM dimming drive chip U2 is connected to resistor R2, pin 3 of the PWM dimming drive chip U2 is connected to resistor R1, the other ends of resistor R1, resistor R2, and resistor R3, as well as pin 8 of the PWM dimming drive chip U2, are all connected to the positive power supply, and pin 4 of the PWM dimming drive chip U2 is connected to the power ground.

[0009] In order to achieve the function of impedance matching at the input end of the dual operational amplifier U1, further in the present invention, the output conversion circuit includes a dual operational amplifier U1, pin 3 of the dual operational amplifier U1 is the input end, and pin 3 of the dual operational amplifier U1 is connected to resistor R6.

[0010] In order to make the obtained DC voltage smoother and more ideal, further in the present invention, the output conversion circuit further includes a second-order low-pass filter circuit. The other end of resistor R6 is connected to the second-order low-pass filter circuit. The second-order low-pass filter circuit includes resistor R4, resistor R5, capacitor C1, and capacitor C2. Among them, the other end of resistor R6 is respectively connected to one end of resistor R5 and capacitor C2, the other end of resistor R5 is respectively connected to one end of resistor R4 and capacitor C1, the other ends of capacitor C1 and capacitor C2 are respectively connected to the power ground, and the other end of resistor R4 is connected to pin 1 of the PWM dimming drive chip U2.

[0011] In order for the output voltage of pin 1 of the dual operational amplifier U1 to be twice the input voltage of pin 3 of the dual operational amplifier U1, further in the present invention, pin 2 of the dual operational amplifier U1 is respectively connected to one ends of resistor R8 and resistor R10, the other end of resistor R8 is connected to the power ground, and the other end of resistor R10 is respectively connected to pin 1 and pin 5 of the dual operational amplifier U1.

[0012] Further in the present invention, pin 8 of the dual operational amplifier U1 is connected to the positive power supply, pin 4 of the dual operational amplifier U1 is connected to the negative power supply. Pin 6 of the dual operational amplifier U1 is connected to pin 7 of the dual operational amplifier U1, and pin 7 of the dual operational amplifier U1 is the output end.

[0013] Further in the present invention, a method for implementing a 0-10V dimming output port parallel expansion circuit includes the following steps:

[0014] (1). Pin 6 of the PWM dimming drive chip U2 located at the head end is connected to the I / O interface of the microprocessor to realize the input of the single-line dimming transmission signal;

[0015] (2). Pin 5 of the previous-stage PWM dimming drive chip U2 is connected to pin 6 of the next-stage PWM dimming drive chip U2, and so on to realize the cascade expansion of the PWM output signal.

[0016] (3). The pin 1 of the PWM dimming drive chip U2 is connected to the input end of the corresponding output conversion circuit to realize the input of the PWM dimming signal;

[0017] (4). The pin 7 of the dual operational amplifier U1 outputs a 0-10V dimming signal.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. Each output conversion circuit of the present invention is relatively independently connected to the output port of the corresponding control signal serial expansion circuit, realizing the arbitrary expansion ability of the number of independent 0-10V dimming output ports;

[0020] 2. Only the pin 6 of the PWM dimming drive chip U2 located at the head end of the present invention is connected to the I / O interface of the microprocessor, solving the problem in the prior art that the free expansion of the port number cannot be realized due to the limitation of the number of independent PWM ports of the microprocessor;

[0021] 3. The present invention has the characteristics of flexible application, strong scalability, economy and practicality, and the circuit is simple and can ensure the stability and reliability of operation. Description of the Drawings

[0022] Figure 1 is the system block diagram of the present invention;

[0023] Figure 2 is the circuit diagram of the control signal serial expansion circuit of the present invention;

[0024] Figure 3 is the circuit diagram of the output conversion circuit of the present invention;

[0025] In the figure: 1. Control signal serial expansion circuit; 2. Output conversion circuit. Detailed Embodiment

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1

[0028] Please refer to Figures 1-3, the present invention provides the following technical solution: A 0-10V dimming output port parallel expansion circuit, including several control signal serial expansion circuits 1 and several output conversion circuits 2 corresponding to the control signal serial expansion circuits 1. Among them, the control signal serial expansion circuit 1 includes a PWM dimming drive chip U2. The 5th pin of the previous PWM dimming drive chip U2 is connected to the 6th pin of the next PWM dimming drive chip U2, and the 6th pin of the PWM dimming drive chip U2 at the head end is connected to the I / O interface of the microprocessor. The 1st pin of the PWM dimming drive chip U2 is connected to the input end of the corresponding output conversion circuit 2, and the output end of the output conversion circuit 2 outputs a dimming signal.

[0029] Specifically, the 1st pin of the PWM dimming drive chip U2 is also connected to a resistor R3, the 2nd pin of the PWM dimming drive chip U2 is connected to a resistor R2, the 3rd pin of the PWM dimming drive chip U2 is connected to a resistor R1. The other ends of the resistor R1, the resistor R2, and the resistor R3, as well as the 8th pin of the PWM dimming drive chip U2, are all connected to the positive power supply. The 4th pin of the PWM dimming drive chip U2 is connected to the power ground.

[0030] By adopting the above technical solution, the connection of the resistor R1, the resistor R2, and the resistor R3 to the positive power supply plays the role of an output pull-up resistor, providing the voltage necessary for PWM output.

[0031] Specifically, the output conversion circuit 2 includes a dual operational amplifier U1. The 3rd pin of the dual operational amplifier U1 is the input end, and the 3rd pin of the dual operational amplifier U1 is connected to a resistor R6.

[0032] By adopting the above technical solution, the impedance matching of the input end of the dual operational amplifier U1 is achieved through the resistor R6.

[0033] Specifically, the 2nd pin of the dual operational amplifier U1 is respectively connected to one ends of a resistor R8 and a resistor R10. The other end of the resistor R8 is connected to the power ground. The other end of the resistor R10 is respectively connected to the 1st pin and the 5th pin of the dual operational amplifier U1.

[0034] By adopting the above technical solution, the output voltage of the 1st pin of the dual operational amplifier U1 is made twice the input voltage of the 3rd pin of the dual operational amplifier U1 through the resistor R8 and the resistor R10.

[0035] Specifically, the 8th pin of the dual operational amplifier U1 is connected to the positive power supply, and the 4th pin of the dual operational amplifier U1 is connected to the negative power supply; the 6th pin of the dual operational amplifier U1 is connected to the 7th pin of the dual operational amplifier U1, and the 7th pin of the dual operational amplifier U1 is the output end.

[0036] Embodiment 2

[0037] The difference between this embodiment and Embodiment 1 lies in that: Specifically, the output conversion circuit 2 further includes a second-order low-pass filter circuit. The other end of the resistor R6 is connected to the second-order low-pass filter circuit. The second-order low-pass filter circuit includes a resistor R4, a resistor R5, a capacitor C1, and a capacitor C2. Among them, the other end of the resistor R6 is respectively connected to one end of the resistor R5 and the capacitor C2. The other end of the resistor R5 is respectively connected to one end of the resistor R4 and the capacitor C1. The other ends of the capacitor C1 and the capacitor C2 are respectively connected to the power ground. The other end of the resistor R4 is connected to pin 1 of the PWM dimming driver chip U2.

[0038] By adopting the above technical solution, filtering is performed through the second-order low-pass filter circuit, making the obtained DC voltage smoother and more ideal.

[0039] Furthermore, a method for implementing a 0-10V dimming output port parallel expansion circuit according to the present invention includes the following steps:

[0040] (1) The 6th pin of the PWM dimming driver chip U2 located at the head end is connected to the I / O interface of the microprocessor to realize the input of the single-line dimming transmission signal;

[0041] (2) The 5th pin of the previous-stage PWM dimming driver chip U2 is connected to the 6th pin of the next-stage PWM dimming driver chip U2, and so on to realize the cascade expansion of the PWM output signal;

[0042] (3) The 1st pin of the PWM dimming driver chip U2 is connected to the input end of the corresponding output conversion circuit 2 to realize the input of the PWM dimming signal;

[0043] (4) The 7th pin of the dual operational amplifier U1 outputs a 0-10V dimming signal.

[0044] In summary, each output conversion circuit of the present invention is relatively independently connected to the output port of the corresponding control signal serial expansion circuit, realizing the arbitrary expansion ability of the number of independent 0-10V dimming output ports; in the present invention, only the 6th pin of the PWM dimming driver chip U2 located at the head end is connected to the I / O interface of the microprocessor, solving the problem in the prior art that the free expansion of the port number cannot be realized due to the limitation of the number of independent PWM ports of the microprocessor; the present invention has the characteristics of flexible application, strong scalability, economy and practicality, and the circuit is simple and can ensure the stability and reliability of operation.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 0-10V dimming output port parallel expansion circuit, comprising a plurality of control signal serial expansion circuits and a plurality of output conversion circuits corresponding to the control signal serial expansion circuits, wherein, The control signal serial expansion circuit includes a PWM dimming drive chip U2. The 5th pin of the previous-stage PWM dimming drive chip U2 is connected to the 6th pin of the next-stage PWM dimming drive chip U2, and the 6th pin of the PWM dimming drive chip U2 at the head end is connected to the I / O interface of the microprocessor. The 1st pin of the PWM dimming drive chip U2 is connected to the input end of the corresponding output conversion circuit, and the output end of the output conversion circuit outputs a dimming signal. The output conversion circuit includes a dual operational amplifier U1. The 3rd pin of the dual operational amplifier U1 is the input end. The 3rd pin of the dual operational amplifier U1 is connected to a resistor R6. The 2nd pin of the dual operational amplifier U1 is respectively connected to one end of a resistor R8 and a resistor R10. The other end of the resistor R8 is connected to the power ground. The other end of the resistor R10 is respectively connected to the 1st pin and the 5th pin of the dual operational amplifier U1. The 1st pin of the PWM dimming drive chip U2 is also connected to a resistor R3. The 2nd pin of the PWM dimming drive chip U2 is connected to a resistor R2. The 3rd pin of the PWM dimming drive chip U2 is connected to a resistor R1. The other ends of the resistor R1, the resistor R2, and the resistor R3, as well as the 8th pin of the PWM dimming drive chip U2, are all connected to the positive power supply. The 4th pin of the PWM dimming drive chip U2 is connected to the power ground. The output conversion circuit further includes a second-order low-pass filter circuit. The other end of the resistor R6 is connected to the second-order low-pass filter circuit. The second-order low-pass filter circuit includes a resistor R4, a resistor R5, a capacitor C1, and a capacitor C2. Among them, the other end of the resistor R6 is respectively connected to one end of the resistor R5 and the capacitor C2. The other end of the resistor R5 is respectively connected to one end of the resistor R4 and the capacitor C1. The other ends of the capacitor C1 and the capacitor C2 are respectively connected to the power ground. The other end of the resistor R4 is connected to the 1st pin of the PWM dimming drive chip U2. Each output conversion circuit is relatively independently connected to the output port of the corresponding control signal serial expansion circuit. Only the 6th pin of the PWM dimming drive chip U2 at the head end is connected to the I / O interface of the microprocessor.

2. The parallel expansion circuit for 0-10V dimming output ports according to claim 1, wherein: The 8th pin of the dual operational amplifier U1 is connected to the positive power supply. The 4th pin of the dual operational amplifier U1 is connected to the negative power supply.

3. A 0-10V dimming output port parallel expansion circuit according to claim 1, characterized in that: The 6th pin of the dual operational amplifier U1 is connected to the 7th pin of the dual operational amplifier U1. The 7th pin of the dual operational amplifier U1 is the output end.

4. A method for parallel expansion of a 0-10V dimming output port according to any one of claims 1-3, characterized in that, It includes the following steps: (1). The 6th pin of the PWM dimming drive chip U2 at the head end is connected to the I / O interface of the microprocessor to realize the input of the single-line dimming transmission signal. (2). The 5th pin of the previous-stage PWM dimming drive chip U2 is connected to the 6th pin of the next-stage PWM dimming drive chip U2, and so on to realize the cascaded expansion of the PWM output signal. (3). The 1st pin of the PWM dimming drive chip U2 is connected to the input end of the corresponding output conversion circuit to realize the input of the PWM dimming signal. (4). The 7th pin of the dual operational amplifier U1 outputs a 0 - 10V dimming signal.

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