CN105430800A - Light wave breaker circuit and LED control circuit fabricated by using light wave breaker circuit - Google Patents
Light wave breaker circuit and LED control circuit fabricated by using light wave breaker circuit Download PDFInfo
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- CN105430800A CN105430800A CN201510954009.0A CN201510954009A CN105430800A CN 105430800 A CN105430800 A CN 105430800A CN 201510954009 A CN201510954009 A CN 201510954009A CN 105430800 A CN105430800 A CN 105430800A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The invention discloses a light wave breaker circuit, which comprises a diode D1, a diode D2, an inductor L1, an MOS tube Q1, a capacitor C1, a capacitor C2 and a capacitor C3. The invention further discloses an LED control circuit fabricated by using the light wave breaker circuit. The LED control circuit comprises an LED and a PWM control terminal; the PWM control terminal is used for modulating the LED in a PWM manner; and the light wave breaker circuit is also connected between the PWM control terminal and the LED. A PWM digital current for dimming is smoothly transformed and converted into an undistorted analogue current signal through the light wave breaker circuit, that is, a discontinuous signal is converted into a continuous signal, so that the technical problems are solved; the LED control circuit designed by using the light wave breaker circuit is simple in principle; and a PWM circuit capable of avoiding the technical problems is provided.
Description
Technical field
The LED control circuit that the present invention relates to a kind of light wave interrupter circuit and utilize it to make.
Background technology
Smart Home is more and more universal, is especially representative with intelligent lighting, by main control chip control output pwm pulse modulation signal, LED is carried out to the control of various lighting mode; But in the process that this mode is universal, applicant have also discovered some problems which exists, and key factor has following 4 points: 1, noise problem; 2, optical frequency dodges problem; 3, there is ghost in illuminated object; 4, IR infrared signal transmission disturbance problem; For problem 1, namely there will be certain noise, in the past, it is conventionally believed that these noises are only derived from electric capacity or transformer, thus only improve for electric capacity and transformer.But applicant finds, its certain noise, not only from transformer or electric capacity, when being also derived from PWM, lamp housing produces the noise of resonance.For problem 2, optical frequency dodges problem, namely produces bright problem of constantly going out, and this is because PWM itself belongs to the pulse modulation mode of similar digital signal, and therefore stroboscopic problem is difficult to solve.For problem 3, there is ghost in illuminated object, namely the people of fast moving or body surface produces the visual effect of running orbit; This is also because PWM mode is caused by pulse modulation.For problem 4, IR infrared signal transmission disturbance problem, found by research, if adopt PWM mode, IR infrared signal receives and transmitting range can be greatly affected, but people do not know its reason in the past, applicant is by studying discovery for many years, when this problem is still PWM, after lamp housing produces resonance, the reception of IR infrared signal and transmitting range are created to the reason of significant impact, therefore comprehensively above-mentioned four subject matters are passed through, design one is needed simply to insert circuit, interrupt problem and other the problems referred to above that this resonance produces noise source, and utilize this interrupter circuit to design a simple LED control circuit.
Summary of the invention
The object of the invention is to overcome above-described shortcoming, the LED control circuit a kind of light wave interrupter circuit being provided and utilizing light wave interrupter circuit to make.
For achieving the above object, concrete scheme of the present invention is as follows: a kind of light wave interrupter circuit, includes diode D1, diode D2, inductance L 1, metal-oxide-semiconductor Q1, electric capacity C1, electric capacity C2, electric capacity C3; The negative pole of described diode D1 connects one end of inductance L 1, and the positive pole of diode D2 connects the other end of inductance L 1; The negative pole of described diode D4 is connected with one end of inductance L 1 by electric capacity C3; One end of described inductance L 1 also connects grounded circuit by electric capacity C1; The positive pole of described diode D4, it is connected with the other end of inductance L 1, and it is also connected with the drain electrode of metal-oxide-semiconductor Q1;
Described metal-oxide-semiconductor, its grid and its source electrode all connect grounded circuit; Described diode D3, its negative pole connects the other end of inductance L 1, and its positive pole connects grounded circuit; The negative pole of described diode D2 connects grounded circuit by electric capacity C2.
The LED control circuit utilizing above-mentioned light wave interrupter circuit to make, includes LED and the PWM control end for modulating LED with PWM mode; Light wave interrupter circuit is also provided with between described PWM control end and LED;
Described light wave interrupter circuit: include diode D1, diode D2, inductance L 1, metal-oxide-semiconductor Q1, electric capacity C1, electric capacity C2, electric capacity C3; The negative pole of described diode D1 connects one end of inductance L 1, and the positive pole of diode D2 connects the other end of inductance L 1; The negative pole of described diode D4 is connected with one end of inductance L 1 by electric capacity C3; One end of described inductance L 1 also connects grounded circuit by electric capacity C1; The positive pole of described diode D4, it is connected with the other end of inductance L 1, and it is also connected with the drain electrode of metal-oxide-semiconductor Q1;
Described metal-oxide-semiconductor, its grid and its source electrode all connect grounded circuit; Described diode D3, its negative pole connects the other end of inductance L 1, and its positive pole connects grounded circuit; The negative pole of described diode D2 connects grounded circuit by electric capacity C2;
Described metal-oxide-semiconductor, its grid is also connected to the SW end that PWM regulates and controls chip.
Wherein, described metal-oxide-semiconductor is NMOS tube.
Wherein, also include resistance R1 and resistance R2, described metal-oxide-semiconductor, its grid connects ground connection by resistance R1 and returns, and its source electrode connects ground connection by resistance R2 and returns.
Wherein, also include resistance R3, described metal-oxide-semiconductor, its grid is connected to by resistance R3 the SW end that PWM regulates and controls chip.
Beneficial effect of the present invention is: by light wave interrupter circuit, the PWM digital current being used for light modulation is smoothly transformed and converts distortionless analog current signal to, continuous print signal is converted to by discontinuous signal, solve above-mentioned technical problem, and utilize the LED control circuit that light wave interrupter circuit is designed, its principle is simple, provides a kind of PWM circuit avoiding above-mentioned technical problem.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention;
Fig. 2 is schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation, is not practical range of the present invention is confined to this.
As shown in Figure 1 to Figure 2, a kind of light wave interrupter circuit described in the present embodiment, includes diode D1, diode D2, inductance L 1, metal-oxide-semiconductor Q1, electric capacity C1, electric capacity C2, electric capacity C3; The negative pole of described diode D1 connects one end of inductance L 1, and the positive pole of diode D2 connects the other end of inductance L 1; The negative pole of described diode D4 is connected with one end of inductance L 1 by electric capacity C3; One end of described inductance L 1 also connects grounded circuit by electric capacity C1; The positive pole of described diode D4, it is connected with the other end of inductance L 1, and it is also connected with the drain electrode of metal-oxide-semiconductor Q1; Described metal-oxide-semiconductor, its grid and its source electrode all connect grounded circuit; Described diode D3, its negative pole connects the other end of inductance L 1, and its positive pole connects grounded circuit; The negative pole of described diode D2 connects grounded circuit by electric capacity C2.Concrete, diode D1 is responsible for PWM high-frequency high-precision numeral constant-current dimming current conversion to become unidirectional analog DC, and the high-frequency signal that then electric capacity C1 is responsible for PWM after conversion remains crosses the analog operation electric current filtering smoothly; Inductance L 1 and metal-oxide-semiconductor Q1 is utilized again level and smooth electric current to be carried out by high frequency (with the frequency of transformer synchro switch above) alternating voltage that secondary transducing is converted into high frequency, diode D2 and electric capacity C2 is responsible for high-frequency ac voltage rectification and filtering again, makes analog DC become the pure working direct current of LED of super level and smooth (reaching mV level ripple).Suction peak, loop during diode D3, diode D4 and electric capacity C3 composition HF switch and freewheeling circuit, the main force sops up the EMI problem in metal-oxide-semiconductor Q1 switching circuit.P1 interface in circuit is connected to the SW pin position of PWM pre-driver IC; the high frequency transformer switching signal that synchronous acquisition is identical with IC; then carry out second energy and convert completely isolated digital dimming pwm switching signal, from then on make LED module obtain the lighting source of green very environment protection health.In fact be exactly by discontinuous signal is converted to continuous print signal, avoid resonance problem and produce; It is noted herein that, before solution resonance problem, through applicant's day and night test repeatedly and checking, just find impact for the pwm signal light source ripple short distance of light modulation the expansion light shield that covers on LED pearl and there occurs the resonance signal identical with PWM dim signal, make expansion light shield and lamp outer casing occur resonate and occur noise, this problem is called after herein: light wave resonates.Therefore, the problem solving light wave resonance also surely can be avoided the problems referred to above for the LED in Smart Home and produce revolutionary impact.In addition, discontinuous signal is converted to continuous print signal, also solves the problem of stroboscopic, kill two birds with one stone.
The LED control circuit utilizing above-mentioned light wave interrupter circuit to make, includes LED and the PWM control end for modulating LED with PWM mode; Light wave interrupter circuit is also provided with between described PWM control end and LED; Described light wave interrupter circuit: include diode D1, diode D2, inductance L 1, metal-oxide-semiconductor Q1, electric capacity C1, electric capacity C2, electric capacity C3; The negative pole of described diode D1 connects one end of inductance L 1, and the positive pole of diode D2 connects the other end of inductance L 1; The negative pole of described diode D4 is connected with one end of inductance L 1 by electric capacity C3; One end of described inductance L 1 also connects grounded circuit by electric capacity C1; The positive pole of described diode D4, it is connected with the other end of inductance L 1, and it is also connected with the drain electrode of metal-oxide-semiconductor Q1; Described metal-oxide-semiconductor, its grid and its source electrode all connect grounded circuit; Described diode D3, its negative pole connects the other end of inductance L 1, and its positive pole connects grounded circuit; The negative pole of described diode D2 connects grounded circuit by electric capacity C2; Described metal-oxide-semiconductor, its grid is also connected to the SW end that PWM regulates and controls chip.This catenation principle, based on above-mentioned light wave interrupter principle, mainly by discontinuous signal is converted to continuous print signal, avoids resonance problem and produces;
A kind of LED control circuit utilizing above-mentioned light wave interrupter circuit to make described in the present embodiment, described metal-oxide-semiconductor is NMOS tube.NMOS tube cost is low, is simple and easy to use.
A kind of LED control circuit utilizing above-mentioned light wave interrupter circuit to make described in the present embodiment, also includes resistance R1 and resistance R2, described metal-oxide-semiconductor, and its grid connects ground connection by resistance R1 and returns, and its source electrode connects ground connection by resistance R2 and returns.Wherein, also include resistance R3, described metal-oxide-semiconductor, its grid is connected to by resistance R3 the SW end that PWM regulates and controls chip.Resistance R1-R3 plays dividing potential drop metering function, first protects each components and parts, also for individual components and parts port match provides condition.
The above is only a preferred embodiment of the present invention, therefore all equivalences done according to structure, feature and the principle described in patent claim of the present invention change or modify, and are included in the protection range of patent application of the present invention.
Claims (5)
1. a light wave interrupter circuit, is characterized in that: include diode D1, diode D2, inductance L 1, metal-oxide-semiconductor Q1, electric capacity C1, electric capacity C2, electric capacity C3; The negative pole of described diode D1 connects one end of inductance L 1, and the positive pole of diode D2 connects the other end of inductance L 1; The negative pole of described diode D4 is connected with one end of inductance L 1 by electric capacity C3; One end of described inductance L 1 also connects grounded circuit by electric capacity C1; The positive pole of described diode D4, it is connected with the other end of inductance L 1, and it is also connected with the drain electrode of metal-oxide-semiconductor Q1;
Described metal-oxide-semiconductor, its grid and its source electrode all connect grounded circuit; Described diode D3, its negative pole connects the other end of inductance L 1, and its positive pole connects grounded circuit; The negative pole of described diode D2 connects grounded circuit by electric capacity C2.
2. the LED control circuit utilizing the light wave interrupter circuit of claim 1 to make, includes LED and the PWM control end for modulating LED with PWM mode; It is characterized in that: between described PWM control end and LED, be also provided with light wave interrupter circuit;
Described light wave interrupter circuit: include diode D1, diode D2, inductance L 1, metal-oxide-semiconductor Q1, electric capacity C1, electric capacity C2, electric capacity C3; The negative pole of described diode D1 connects one end of inductance L 1, and the positive pole of diode D2 connects the other end of inductance L 1; The negative pole of described diode D4 is connected with one end of inductance L 1 by electric capacity C3; One end of described inductance L 1 also connects grounded circuit by electric capacity C1; The positive pole of described diode D4, it is connected with the other end of inductance L 1, and it is also connected with the drain electrode of metal-oxide-semiconductor Q1;
Described metal-oxide-semiconductor, its grid and its source electrode all connect grounded circuit; Described diode D3, its negative pole connects the other end of inductance L 1, and its positive pole connects grounded circuit; The negative pole of described diode D2 connects grounded circuit by electric capacity C2;
Described metal-oxide-semiconductor, its grid is also connected to the SW end that PWM regulates and controls chip.
3. LED control circuit according to claim 2, is characterized in that: described metal-oxide-semiconductor is NMOS tube.
4. LED control circuit according to claim 2, is characterized in that: also include resistance R1 and resistance R2, described metal-oxide-semiconductor, and its grid connects ground connection by resistance R1 and returns, and its source electrode connects ground connection by resistance R2 and returns.
5. LED control circuit according to claim 2, is characterized in that: also include resistance R3, described metal-oxide-semiconductor, and its grid is connected to by resistance R3 the SW end that PWM regulates and controls chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510954009.0A CN105430800B (en) | 2015-12-18 | 2015-12-18 | A kind of light wave interrupter circuit and the LED control circuit using its making |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510954009.0A CN105430800B (en) | 2015-12-18 | 2015-12-18 | A kind of light wave interrupter circuit and the LED control circuit using its making |
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| Publication Number | Publication Date |
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| CN105430800A true CN105430800A (en) | 2016-03-23 |
| CN105430800B CN105430800B (en) | 2017-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510954009.0A Expired - Fee Related CN105430800B (en) | 2015-12-18 | 2015-12-18 | A kind of light wave interrupter circuit and the LED control circuit using its making |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112118655A (en) * | 2020-09-07 | 2020-12-22 | 漳州立达信光电子科技有限公司 | LED control circuit and LED lamp |
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- 2015-12-18 CN CN201510954009.0A patent/CN105430800B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112118655A (en) * | 2020-09-07 | 2020-12-22 | 漳州立达信光电子科技有限公司 | LED control circuit and LED lamp |
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| CN105430800B (en) | 2017-07-21 |
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Granted publication date: 20170721 Termination date: 20191218 |