A negative pressure shut-off analog dimming device

Abstract

This invention provides a negative voltage shut-off analog dimming device, relating to dimming technology, comprising: a negative voltage module connected to a power supply, the negative voltage module including a transformer unit for coupling out negative voltage, the transformer unit having a negative voltage reference point; and a dimming conversion module, using the negative voltage reference point as a reference ground, providing an output signal to the reference of an LM358 constant current module. When the dimming conversion module is adjusted to a low level, it generates an analog voltage below 0V to turn off the lamp, overcoming the problems in the prior art, ensuring that dimming is not unable to be turned off, and preventing a faint light.

Description

Technical Field

[0001] This invention relates to dimming technology, and more particularly to a negative pressure shutdown analog dimming device. Background Technology

[0002] With the popularization of intelligent Internet of Things, the demand for intelligent lighting is increasing. At present, most intelligent dimming lights use analog or PWM dimming. Most analog PWM dimming ICs have a turn-off voltage of about 0.xV, so this can achieve the turn-off function.

[0003] However, when using the LM358 as a dimming port, if the dimming input voltage cannot reach an absolute 0V, the dimming will not be turned off, and there will always be a faint light. Summary of the Invention

[0004] This invention provides a negative pressure shutdown simulation dimming device that does not prevent dimming from being shut off.

[0005] According to an embodiment of the present invention, a negative pressure shutdown analog dimming device is provided, comprising:

[0006] A negative pressure module is connected to a power supply. The negative pressure module includes a transformer unit for coupling out negative pressure, and a negative pressure reference point is provided at the transformer unit.

[0007] The dimming conversion module uses the negative voltage reference point as the reference ground and sends the output signal to the reference of the LM358 constant current module. When the dimming conversion module is adjusted to a low level, it generates an analog voltage lower than 0V to turn off the lamp.

[0008] Optionally, in one possible implementation, the transformer unit includes two first transformer windings and a second transformer winding coupled to a power source, wherein the negative terminal of the first transformer winding is the positive terminal of the second transformer winding.

[0009] The negative pressure reference point is set at the winding of the second transformer.

[0010] Optionally, in one possible implementation, the dimming conversion module includes a follow-down unit, which uses a negative pressure reference point as a reference ground;

[0011] The input of the follower reduction unit receives an analog signal, and the output is provided to the reference of the LM358 constant current module.

[0012] Alternatively, in one possible implementation, the analog signal is 0-10V.

[0013] Alternatively, in one possible implementation, the LM358 constant current module includes a voltage loop and a current loop;

[0014] The LM358 constant current module uses the signal output from the output terminal of the follower reduction unit as a reference.

[0015] Alternatively, in one possible implementation, the power supply includes an AC-to-DC module.

[0016] Alternatively, in one possible implementation, the AC-to-DC module includes a Flyback topology unit and a PFC conversion unit.

[0017] Optionally, in one possible implementation, a feedback module is further provided between the LM358 constant current module and the power supply.

[0018] The present invention provides a negative pressure off-state analog dimming device, which uses a negative pressure module to generate a negative pressure as a negative pressure reference point. Then, when the dimming conversion module is adjusted to a low level, it generates an analog voltage below 0V to turn off the lamp. This overcomes the problems in the prior art, ensuring that dimming is not unable to be turned off and that there is no weak light. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the structure of the negative pressure shutdown simulated dimming device of the present invention;

[0020] Figure 2 This is a structural schematic diagram of a negative pressure module provided by the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of a power supply provided by the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of a dimming conversion module provided by the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of an LM358 constant current module provided by the present invention.

[0024] In the diagram, 11 is the first transformer winding; 12 is the second transformer winding; and 2 is the negative voltage reference point. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0027] It should be understood that in the various embodiments of the present invention, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0028] It should be understood that in this invention, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0029] It should be understood that in this invention, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains A, B, and C", "Contains A, B, and C" means that all three A, B, and C are contained; "Contains A, B, or C" means that one of A, B, and C is contained; "Contains A, B, and / or C" means that any one, two, or three of A, B, and C are contained.

[0030] It should be understood that in this invention, "B corresponding to A", "B corresponding to A", "A and B correspond", or "B and A correspond" means that B is associated with A, and B can be determined based on A. Determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information. Matching A and B is defined as a similarity between A and B that is greater than or equal to a preset threshold.

[0031] Depending on the context, "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection."

[0032] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0033] A negative pressure shut-off analog dimming device, see [link / reference] Figure 1 This includes a negative pressure module for generating negative pressure and a dimming conversion module for converting analog signals for dimming. The inventive concept of this solution is to generate a negative pressure as a negative pressure reference point 2, and then, when the dimming conversion module is adjusted to a low setting, generate an analog voltage below 0V to turn off the lamp, overcoming the problems in the prior art, ensuring that dimming is not unable to be turned off, and preventing a faint light.

[0034] Among them, see Figure 2 This is a structural schematic diagram of a negative pressure module provided by the present invention. The negative pressure module is connected to a power supply and includes a transformer unit for coupling out negative pressure. A negative pressure reference point is provided at the transformer unit.

[0035] Specifically, the transformer unit includes two transformer windings 11 and 12 coupled to the power supply. The negative terminal of the first transformer winding 11 is the positive terminal of the second transformer winding 12, and the negative voltage reference point 2 is set at the second transformer winding 12.

[0036] It is understandable that the output of the second transformer winding 12 is the main output ground, so a negative voltage reference point 2 can be drawn out at the second transformer winding 12.

[0037] See Figure 3 This is a schematic diagram of a power supply provided by the present invention. The power supply of this solution includes an AC to DC module, which includes a Flyback topology unit and a PFC conversion unit, thereby obtaining a DC output with voltage limiting and constant current.

[0038] It should be noted that the negative pressure module in this solution is connected to the power supply output.

[0039] See Figure 4 This is a schematic diagram of a dimming conversion module provided by the present invention. The dimming conversion module uses the negative voltage reference point as the reference ground and sends the output signal to the reference of the LM358 constant current module. When the dimming conversion module is adjusted to a low level, it generates an analog voltage lower than 0V to turn off the lamp.

[0040] Specifically, the dimming conversion module includes a follow-down unit, which uses negative pressure reference point 2 as the reference ground. The input of the follow-down unit receives an analog signal, and the output is given to the reference of the LM358 constant current module.

[0041] It is understandable that the follower reduction unit is a follower circuit composed of amplifiers. The ground of this circuit is referenced to the negative voltage reference point 2. When a 0-10V analog signal is input, it is converted to the signal at point A and the signal is reduced proportionally. When the 0-10V signal is adjusted to a relatively low voltage, there will be a relatively small negative voltage at point A, so the output current is absolutely 0, thereby achieving the shutdown.

[0042] See Figure 5 This is a schematic diagram of the structure of an LM358 constant current module provided by the present invention. The LM358 constant current module includes a voltage loop and a current loop, and the LM358 constant current module uses the signal output from the follow reduction unit as a reference. In practical applications, a feedback module is also provided between the LM358 constant current module and the power supply.

[0043] Understandably, this circuit includes a voltage loop and a current loop. The 2.5V stable voltage provided by U5 TL431 serves as the reference voltage point B for the voltage loop. The current loop uses point A, the sampling point after voltage division by R43 and R63, as its reference voltage. The midpoint between R42 and R62 is the voltage sampling point, and point C is the current sampling point. Point C is connected to the dimming output analog signal, and point A is connected to the output terminal of the dimming conversion module. Figure 4 Point A in the diagram.

[0044] Additionally, it should be noted that while existing technologies have proprietary 0-10V dimming ICs, this solution can achieve the same result without a dedicated IC, and it can also achieve a wider dimming range.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A negative voltage turn-off analog dimming device, characterized by, Comprising: A negative pressure module connected with a power supply, the negative pressure module comprising a transformer unit for coupling out negative pressure, the transformer unit being provided with a negative pressure reference point (2); A dimming conversion module taking the negative pressure reference point (2) as reference ground, outputting a signal to the reference of the LM358 constant current module, generating an analog voltage lower than 0V to turn off the lamp when the dimming conversion module is adjusted to a low gear; The transformer unit comprises two first transformer windings (11) and second transformer windings (12) coupled with the power supply, the negative pole of the first transformer winding (11) being the positive pole of the second transformer winding; The negative pressure reference point (2) is arranged at the second transformer winding (12); The dimming conversion module comprises a follow-up reduction unit, the follow-up reduction unit taking the negative pressure reference point (2) as reference ground; The input end of the follow-up reduction unit receives an analog signal, and the output end is connected to the reference of the LM358 constant current module.

2. The negative voltage turn-off analog dimming device of claim 1, wherein, The analog signal is 0-10V.

3. The negative voltage turn-off analog dimming device of claim 1, wherein, The LM358 constant current module comprises a voltage loop and a current loop; The LM358 constant current module takes the signal output by the output end of the follow-up reduction unit as reference.

4. The negative voltage turn-off analog dimming device of claim 1, wherein, The power supply comprises an AC-DC module.

5. A negative voltage turn-off analog dimming device as recited in claim 4, wherein, The AC-DC module comprises a Flyback topology unit and a PFC conversion unit.

6. The negative voltage turn-off analog dimming device of claim 1, wherein, A feedback module is further arranged between the LM358 constant current module and the power supply.

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