CN209693099U - A kind of brightness controlling device - Google Patents

Abstract

This application discloses a kind of brightness controlling devices, and for controlling the brightness of light emitting diode, wherein light emitting diode is located on sensor circuit, and the sensor circuit has induction coil, comprising: energy regenerative circuit and processor；The energy regenerative circuit has filter and the energy regenerative coil corresponding to the induction coil, the filter and the energy regenerative coils from parallel connection of coils, the processor is used for the AC-input voltage according to the voltage signal control energy regenerative circuit after the filter filtering, can be achieved with the technical effect of dimming function to play and not need the loading light adjusting circuit on light emitting device；The accurate adjusting to LED luminance can be carried out on the basis of not outer plus complicated light adjusting circuit.

Description

A brightness control device

technical field

The present application relates to the lighting field, in particular to a brightness control device.

Background technique

Wireless energy-fed lighting has a good application prospect in the medical field. For example, passive devices deployed on the cornea can illuminate the fundus, which helps fundus surgery and inspection. Such devices need to receive and drive energy in a very small space Light-emitting devices, etc., such a minimalist device is difficult to carry a dimming circuit, but in actual use, it needs to be adjusted and stabilized by external control. The prior art does not have a technical solution for solving the above problems.

Contents of the invention

The main purpose of the present application is to provide a brightness control device, which can achieve the technical effect of dimming without loading a dimming circuit on the light emitting device.

The application provides a brightness control device for controlling the brightness of a light-emitting diode, wherein the light-emitting diode is located on an induction circuit, and the induction circuit has an induction coil, including: an energy feeding circuit and a processor; the energy feeding circuit has a filter and a power feeding coil corresponding to the induction coil, the filter is connected in parallel with the power feeding coil, and the processor is used for controlling the AC input voltage of the power feeding circuit according to the voltage signal filtered by the filter.

Further, the AC input voltage includes a sine AC voltage, a cosine AC voltage or a triangular wave AC voltage.

Further, a rectification circuit is included for rectifying the AC input voltage, and the rectification circuit is coupled to the energy feeding circuit.

Further, the rectification circuit is a full-wave rectification circuit.

Further, the filter is a high-pass filter, and the cut-off frequency of the high-pass filter is higher than the frequency of the AC input voltage.

The principle of this application includes: when the energy feeding circuit is used to wirelessly feed the induction circuit, the current and voltage of the energy feeding coil (if electromagnetic induction energy feeding is used) will change with the load of the induction coil. In the case of a diode (LED), when the LED is turned on and off, the different phases of the AC signal on the energy feeding coil will produce obvious jitters that are different from the input AC signal (the twisted point of the twisted signal). In the cycle, the time axis difference between the two twisted points of the twisted signal symmetrical to a peak value of the AC input voltage is the working time of the diode, and the ratio of it to the cycle of the AC input voltage is the working ratio. Just know the working intensity of the LED, that is, the brightness, setting and controlling this working ratio can preset and stably control the brightness of the LED.

Wherein, the distorted signal may be represented by a voltage signal obtained after filtering the input AC signal through a filter.

Specifically, the working ratio can be represented by the formula: |X1-X2|/T (see Figure 3 and Figure 4, where the waveform in Figure 3 will not be rectified, so X1 and X2 only exist above the X axis, Figure 4 The waveform will be rectified, so that the waveform above the X-axis is flipped to the top of the X-axis, so X1 and X2 exist not only above the X-axis, but also below the X-axis), where X1 and X2 are in the AC input In one or half cycle of the voltage, the time axis coordinates of two voltage points of the filtered voltage signal (that is, two twisted points of the twisted signal) symmetrical about a peak value of the AC input voltage (Fig. 3, 4, it is only a legend for easy understanding, the actual twisted jitter can be a waveform of any shape, but the time axis coordinates of the twisted position are fixed); T is the cycle of the AC input voltage.

According to the brightness control device provided by the present application, it can achieve the technical effect of realizing the dimming function without loading a dimming circuit on the light emitting device; it can adjust the brightness of the LED without adding a complicated dimming circuit. Precise adjustment.

Description of drawings

FIG. 1 is a schematic diagram of an induction circuit and a power feeding circuit of a brightness control device according to an embodiment of the application;

Fig. 2 is a schematic block diagram of the structure of a brightness control device according to an embodiment of the present application;

Fig. 3 is the voltage-time graph of the AC input signal of the energy feeding circuit of an embodiment of the present application;

FIG. 4 is a voltage-time curve diagram of an AC input signal of an energy feeding circuit according to another embodiment of the present application.

The specific meanings of reference signs are as follows:

1: light emitting diode; 2: induction coil; 3: energy feeding coil; 4: filter; 5: AC input voltage; 10: induction circuit; 20: energy feeding circuit; 30: processor; 100: brightness control device.

The realization, functional features and advantages of the present application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

Embodiments of the present application are described in detail below, and those skilled in the art can understand that the singular forms "a", "an", "the" and "the" used herein may also include plural forms unless otherwise stated. It should be further understood that the word "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components, and/or groups thereof.

Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as commonly understood by those of ordinary skill in the art to which this application belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have meanings consistent with their meaning in the context of the prior art, and unless specifically defined as herein, are not intended to be idealized or overly Formal meaning to explain.

Referring to Figures 1 and 2, a brightness control device provided by an embodiment of the present application is used to control the brightness of a light-emitting diode, wherein the light-emitting diode is located on an induction circuit, and the induction circuit has an induction coil, including: an energy feeding circuit and a processor ; The energy feeding circuit has a filter and an energy feeding coil corresponding to the induction coil, the filter is connected in parallel with the energy feeding coil, and the processor is used to control the energy feeding according to the voltage signal filtered by the filter AC input voltage to the circuit.

Wherein, the brightness control device feeds energy to the light-emitting diodes on the sensing circuit through the energy feeding circuit. The induction circuit refers to the circuit that can sense and receive the energy fed by the energy feeding circuit, including magnetic field resonance technology, inductive coupling technology, magnetic (field) coupling type, electric (field) coupling type, electromagnetic radiation type (such as solar radiation) , mechanical wave coupling type (ultrasonic), electromagnetic induction technology, etc., for example, can be a circuit including an electromagnetic induction coil, which senses and accepts fed energy through the principle of electromagnetic induction, and the corresponding energy feeding circuit, for example, can be a circuit including an electromagnetic feeding coil, Feed to feed energy by the principle of electromagnetic induction. The distorted signal (which can be represented by filtering the input AC signal through a filter) refers to the abnormal jitter of the AC input signal when the LED is turned on or off, and because the LED is turned on or off in a very short time, so The generation of the distorted signal is also completed in a very short time, so the frequency of the distorted signal is extremely high, much higher than the frequency of the AC input signal (AC voltage signal).

Among them, light-emitting diodes can be used in the medical field, located in devices that can only accommodate sensing circuits, such as on passive devices deployed on the cornea, on small devices that penetrate deep into body cavities, and so on. Light-emitting diodes can also be used in other fields, preferably on devices that have only minimal space to accommodate circuitry.

The brightness control device includes an energy feeding circuit and a processor. The energy feeding circuit has a filter, and the processor controls the AC input voltage of the energy feeding circuit according to the voltage signal filtered by the filter. Wherein, the AC input voltage may be any form of AC voltage, including sine AC voltage, cosine AC voltage or triangular wave AC voltage (AC voltage with a triangular waveform). Wherein, the filter is any filter that can filter out the distorted signal, preferably a high-pass filter. The cut-off frequency of the high-pass filter is higher than the frequency of the AC input voltage and lower than the frequency of the distorted signal, so that all The AC input voltage is used to screen out the distorted signal (since the frequency of the distorted signal is much higher than the frequency of the AC input voltage, it will not be filtered).

Further, the brightness control device further includes a rectification circuit for rectifying the AC input voltage, and the rectification circuit is coupled to the energy feeding circuit. The rectification circuit can be, for example, a half-wave rectification circuit, a full-wave rectification circuit, etc., preferably a full-wave rectification circuit. Therefore, the working time of the light-emitting diode is increased, and the energy utilization rate is increased.

Here is an example of how to use the brightness control device of this embodiment:

1. The energy feeding circuit is input with sinusoidal AC voltage signal;

2. The induction circuit senses and receives energy;

3. When the voltage of the light-emitting diode on the induction circuit is higher than the threshold voltage of the light-emitting diode, the light-emitting diode is turned on; at this time, the load of the induction circuit changes suddenly, and the current and voltage of the energy feeding circuit will change with the load of the receiving coil. , so the sine wave voltage of the energy feeding circuit will vibrate obviously (distortion); similarly, when the voltage of the light-emitting diode on the sensing circuit is lower than the threshold voltage of the light-emitting diode, the light-emitting diode is turned off, and the sine wave voltage of the energy feeding circuit Visible jitter (distortion) also occurs;

4. The filter performs filtering to obtain the distorted signal, and transmits the distorted signal to the processor;

5. The processor adjusts the sinusoidal AC voltage according to the distorted signal (adjusting the ratio of the width of the distorted point to the period of the AC input voltage), and then the brightness control of the light-emitting diode can be realized; the adjustment methods include pulse width modulation, pulse frequency modulation, and pulse frequency modulation. Amplitude modulation or adjusting the amplitude of the AC input voltage to control the brightness of the light emitting diode.

According to the brightness control device provided by the present application, it can achieve the technical effect of realizing the dimming function without loading a dimming circuit on the light emitting device; it can adjust the brightness of the LED without adding a complicated dimming circuit. Precise adjustment.

The above are only preferred embodiments of the application, and are not intended to limit the patent scope of the application. Any equivalent structure or equivalent process conversion made by using the specification and drawings of the application, or directly or indirectly used in other related All technical fields are equally included in the patent protection scope of the present application.

Claims (5)

1. A brightness control device, used to control the brightness of light-emitting diodes, wherein the light-emitting diodes are located on the induction circuit, the induction circuit has an induction coil, it is characterized in that, comprising: an energy feeding circuit and a processor; the energy feeding circuit There is a filter and a power feeding coil corresponding to the induction coil, the filter is connected in parallel with the power feeding coil, and the processor is used to control the AC input voltage of the power feeding circuit according to the voltage signal filtered by the filter . 2. The brightness control device according to claim 1, wherein the AC input voltage comprises a sine AC voltage, a cosine AC voltage or a triangular wave AC voltage. 3. The brightness control device according to claim 1, characterized by comprising a rectification circuit for rectifying the AC input voltage, the rectification circuit being coupled to the energy feeding circuit. 4. The brightness control device according to claim 3, wherein the rectification circuit is a full-wave rectification circuit. 5. The brightness control device according to any one of claims 1-4, wherein the filter is a high-pass filter, and a cut-off frequency of the high-pass filter is higher than a frequency of the AC input voltage.