CN205320326U - A light wave interrupter circuit and LED control circuit made by using it - Google Patents

Abstract

The utility model relates to a light wave interrupter circuit and a LED control circuit manufactured by the same; the light wave interrupter circuit comprises an inductor L1, a capacitor C1 and a capacitor C2; one end of the capacitor C1 is connected with one end of the inductor L1, and the other end of the capacitor C1 is grounded; and one end of the capacitor C2 is connected with the other end of the inductor L1, and the other end of the capacitor C2 is grounded. The LED control circuit of the light wave interrupter circuit comprises a PWM modulation control end, a switch circuit and an LED; the PWM modulation control end controls the turn-off of the LED by controlling the switch circuit; an optical wave interrupter circuit is connected between the LED and the switch circuit, the control circuit has a simple principle, and a simplified PWM (pulse width modulation) circuit for avoiding technical problems such as resonance and the like is provided.

Description

A light wave interrupter circuit and LED control circuit made by using it

technical field

The utility model relates to a light wave interrupter circuit and an LED control circuit manufactured by using the same.

Background technique

Smart homes are becoming more and more popular, especially represented by smart lights, which control various lighting methods of LEDs through the control of the main control chip to output PWM pulse modulation signals; however, in the process of popularizing this method, the applicant also We found some problems with this method, which mainly come down to the following four points: 1. Noise problem; 2. Light strobe problem; 3. Ghosting of the illuminated object; 4. IR infrared signal transmission interference problem; for problem 1, That is, there will be certain noise. In the past, people usually thought that these noises only came from capacitors or transformers, so they only improved capacitors and transformers. However, the applicant found that certain noise is not only from the transformer or capacitor, but also from the resonance noise of the lamp housing during PWM modulation. For problem 2, the problem of stroboscopic light, that is, the problem of constantly turning off the light, this is because PWM itself is a pulse modulation method similar to digital signals, so the stroboscopic problem is difficult to solve. For problem 3, ghost images appear on the illuminated object, that is, the visual effect of a running track on the surface of a fast-moving person or object; this is also due to the PWM modulation method being pulse modulation. For question 4, IR infrared signal transmission interference, through research, it is found that if PWM modulation is used, the receiving and transmitting distance of IR infrared signal will be greatly affected, but people did not know the reason in the past, the applicant found through years of research , this kind of problem is still due to the resonance of the lamp shell during PWM modulation, which has a significant impact on the receiving and transmitting distance of IR infrared signals. Therefore, by integrating the above four main problems, it is necessary to design a simple plug-in circuit to interrupt This resonance creates a noise source problem along with other issues mentioned above and a simple LED control circuit is designed using this interrupter circuit.

Utility model content

The purpose of the utility model is to overcome the above-mentioned shortcomings, and provide a light wave interrupter circuit and an LED control circuit made of the light wave interrupter circuit.

In order to achieve the above object, the specific solution of the utility model is as follows: a light wave interrupter circuit, including an inductor L1, a capacitor C1, and a capacitor C2; one end of the capacitor C1 is connected to one end of the inductor L1, and the other end is grounded; One end of the capacitor C2 is connected to the other end of the inductor L1, and the other end is grounded.

An LED control circuit using a light wave interrupter circuit, including a PWM modulation control terminal, a switch circuit, and an LED; the PWM modulation control terminal controls the shutdown of the LED by controlling the switch circuit; the LED and the switch circuit are connected with A light wave interrupter circuit; the light wave interrupter circuit includes an inductor L1, a capacitor C1, and a capacitor C2; one end of the capacitor C1 is connected to one end of the inductor L1, and the other end is grounded; the other end of the capacitor C2 is connected to the inductor The other end of L1 is connected, and the other end of it is grounded.

Wherein, the switch circuit includes a triode Q1; the collector of the triode Q1 is connected to the other end of the inductor L1, its emitter is grounded, and its base is connected to the PWM modulation control terminal;

The negative pole of the LED is connected to one end of the inductor L1, and the positive pole is connected to the power supply VCC.

Wherein, a resistor R2 is also included, and the base of the triode Q1 is also grounded through the resistor R2.

Wherein, a resistor R1 is also included, and the base of the triode Q1 is connected to the PWM modulation control terminal through the resistor R1.

Wherein, a resistor R3 is also included, and the anode of the LED is connected to the power supply VCC through the resistor R3.

The beneficial effects of the utility model: through the light wave interrupter circuit, the PWM digital current used for dimming is smoothly converted into an undistorted analog current signal, that is, the discontinuous signal is converted into a continuous signal, which solves the above technical problems, and The LED control circuit designed by using the light wave interrupter circuit has a simple principle and provides a PWM modulation circuit that avoids the above-mentioned technical problems.

Description of drawings

Fig. 1 is the schematic diagram of the LED control circuit that utilizes the light wave interrupter circuit of the present invention to make;

Explanation of reference numerals in FIG. 1: 1—light wave interrupter circuit.

detailed description

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, and the scope of implementation of the utility model is not limited thereto.

As shown in Figure 1, a light wave interrupter circuit described in this embodiment includes an inductor L1, a capacitor C1, and a capacitor C2; one end of the capacitor C1 is connected to one end of the inductor L1, and the other end is grounded; The above-mentioned capacitor C2, one end of which is connected to the other end of the inductor L1, and the other end is grounded; through the conversion of the inductance and the cooperation of the capacitor, the PWM digital current used for dimming is smoothly converted into an undistorted analog current signal, thereby converting The discontinuous signal is converted into a continuous signal, which solves the above-mentioned technical problems. Specifically, the inductor L1 converts the PWM high-frequency digital constant-current dimming current into a unidirectional analog DC current, the capacitor C1 is responsible for filtering the high-frequency signal remaining in the converted PWM signal to obtain a smooth analog working current, and the capacitor C2 is responsible for converting The high-frequency AC voltage is rectified and filtered again, making the analog DC current ultra-smooth. That is, by converting the discontinuous signal into a continuous signal, the resonance problem is avoided; before solving the resonance problem, the applicant discovered the PWM signal light source wave used for dimming after many tests and verifications day and night. The short-distance impact on the diffuser cover on the LED beads produces the same resonance signal as the PWM dimming signal, which makes the diffuser resonate with the lamp shell and cause noise. This problem is named in this paper: light wave resonance. Therefore, solving the problem of light wave resonance will also have a revolutionary impact on avoiding the above-mentioned problems for LEDs in smart homes. In addition, converting discontinuous signals into continuous signals also solves the problem of stroboscopic flicker, killing two birds with one stone.

An LED control circuit using a light wave interrupter circuit, including a PWM modulation control terminal, a switch circuit, and an LED; the PWM modulation control terminal controls the shutdown of the LED by controlling the switch circuit; the LED and the switch circuit are connected with Light wave interrupter circuit 1; the light wave interrupter circuit 1 includes an inductor L1, a capacitor C1, and a capacitor C2; one end of the capacitor C1 is connected to one end of the inductor L1, and the other end is grounded; the capacitor C2 has one end It is connected with the other end of the inductor L1, and the other end is grounded. This circuit is a PWM modulation circuit that uses the PWM modulation method of the LED and integrates the light wave interrupter circuit to design a PWM modulation circuit that has a simple principle and avoids the above-mentioned technical problems such as resonance and affecting infrared signals; The LED control circuit of the circuit, the switch circuit includes a triode Q1; the collector of the triode Q1 is connected to the other end of the inductor L1, the emitter is grounded, and the base is connected to the PWM modulation control terminal; the LED, Its negative pole is connected to one end of the inductor L1, and its positive pole is connected to the power supply VCC. The specific principle is as follows. The PWM modulation control terminal sends out a PWM pulse modulation signal. By controlling the base of the transistor Q1, the collector and emitter of the transistor Q1 are turned on or off, thereby controlling the LED on and off. By setting In the light wave interrupter circuit, the current of the LED will be converted from a discontinuous signal to a continuous signal; therefore, problems caused by discontinuous signals such as resonance and noise are avoided.

The LED control circuit using a light wave interrupter circuit described in this embodiment further includes a resistor R2, and the base of the triode Q1 is also grounded through the resistor R2. The resistor R2 acts as a part of current diversion, so that the operation of the triode Q1 will be more stable and efficient.

The LED control circuit using the light wave interrupter circuit described in this embodiment also includes a resistor R1, the base of the triode Q1 is connected to the PWM modulation control terminal through the resistor R1; the resistor R1 acts as a current limiter, Match the PWM modulation control terminal so that the PWM modulation control terminal and the base of the transistor Q1 can match as much as possible.

The LED control circuit using the light wave interrupter circuit described in this embodiment also includes a resistor R3, and the anode of the LED is connected to the power supply VCC through the resistor R3; the resistor R3 mainly functions as a voltage divider to avoid LED current overload And damage, improve the stability of the utility model.

The above is only a preferred embodiment of the utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the utility model patent application are included in the protection of the utility model patent application. within range.

Claims (6)

1. a light wave interrupter circuit, it is characterised in that: include inductance L 1, electric capacity C1, electric capacity C2;Described electric capacity C1, its one end is connected with one end of inductance L 1, its other end ground connection; Described electric capacity C2, its one end is connected with the other end of inductance L 1, its other end ground connection.

2. adopt a LED control circuit for the light wave interrupter circuit of claim 1, include PWM control end, switch circuit, LED; Described PWM control end controls the shutoff of LED by trip switch circuit; It is characterized in that: between LED and switch circuit, be provided with light wave interrupter circuit (1); Described light wave interrupter circuit (1) includes inductance L 1, electric capacity C1, electric capacity C2; Described electric capacity C1, its one end is connected with one end of inductance L 1, its other end ground connection; Described electric capacity C2, its one end is connected with the other end of inductance L 1, its other end ground connection.

3. LED control circuit according to claim 2, it is characterised in that: described switch circuit includes triode Q1; Described triode Q1, its collector electrode is connected with the other end of inductance L 1, its grounded emitter, and its base stage is connected with PWM control end;

Described LED, its negative pole is connected with one end of inductance L 1, and its positive pole meets power supply VCC.

4. LED control circuit according to claim 3, it is characterised in that: also including resistance R2, the base stage of described triode Q1 is also by resistance R2 ground connection.

5. LED control circuit according to claim 3, it is characterised in that: also including resistance R1, described triode Q1, its base stage is connected with PWM control end by resistance R1.

6. LED control circuit according to claim 3, it is characterised in that: also including resistance R3, described LED, its positive pole meets power supply VCC by resistance R3.