CN112188676A - LED light source respiration effect adjusting circuit and LED light source driving circuit - Google Patents

Abstract

LED light source respiration effect regulating circuit and LED light source drive circuit. The invention relates to a respiratory effect regulating circuit of an LED light source, which is characterized by comprising a voltage gradual rising module, wherein the voltage gradual rising module comprises: the first resistor comprises a first end and a second end which are opposite, and the first end of the first resistor receives a pulse width modulation signal to be processed; the positive plate of the first capacitor is connected with the second end of the first resistor, and the negative plate of the first capacitor is grounded; and the positive input end of the operational amplifier is connected with the second end of the first resistor and the positive plate of the first capacitor, and the output end of the operational amplifier is in short circuit with the negative input end of the operational amplifier. This application is through setting up the voltage module that slowly rises, has increased the time ratio of the low luminance section of LED light source in whole breathing effect time period, has solved because the LED light source low luminance section time ratio is low the problem that the whole luminance change process that causes is uneven, has improved the whole impression of breathing effect.

Description

LED light source respiration effect adjusting circuit and LED light source driving circuit

Technical Field

The invention relates to the field of vehicle electronic control, in particular to an LED light source respiration effect adjusting circuit and an LED light source driving circuit.

Background

With the rapid development of LED technology, more and more LED light sources replace the traditional light sources. As is well known, LEDs have many advantages as light sources, and among them, the easy-to-adjust color light is one of the greatest advantages of LED light sources. The breathing effect means that the LED light source can complete the gradual change process from light to dark or from dark to light under the control of equipment, and the process generally has obvious rhythm of light and extinguishment like breathing. At present, the breathing effect is widely applied to the LED light source for the vehicle, and the breathing effect not only can play a role in lighting and decorating a user, but also can increase the environment atmosphere.

At present, many small-power vehicle LED lamps have single functions, and most of vehicle LED light sources are driven in a linear control mode due to high cost and pressure, and a PWM signal whose duty ratio is increased or decreased with time is output by a BCM (body control module) to enable the rear-end linearly controlled LED light source to achieve a respiratory effect. However, since the PWM signal outputted by the BCM is not easily changed by the car manufacturer, and the types and models of the LED light sources are very numerous, the lamp manufacturer can only be required to adjust and adapt itself to achieve an ideal breathing effect, which is inconvenient.

Disclosure of Invention

In view of the above, it is necessary to provide a breathing effect adjusting circuit for LED light sources and a driving circuit for LED light sources, which can be applied to different types and models of LED light sources.

The first aspect of this application provides a LED light source respiration effect regulating circuit, including the voltage slowly rises the module, the voltage slowly rises the module and includes:

the first resistor comprises a first end and a second end which are opposite, and the first end of the first resistor receives a pulse width modulation signal to be processed;

the positive plate of the first capacitor is connected with the second end of the first resistor, and the negative plate of the first capacitor is grounded;

and the positive input end of the operational amplifier is connected with the second end of the first resistor and the positive plate of the first capacitor, and the output end of the operational amplifier is in short circuit with the negative input end of the operational amplifier.

In the above-described embodiment of the LED light source respiratory effect adjusting circuit, since the pulse width modulation signal to be processed is usually a square wave signal, there is a sudden change at the rising edge, which causes the respiratory effect of the LED light source to be suddenly bright or dim; in addition, because the light emitting characteristic of the LED light source is not linear, the LED light source cannot show an ideal gradually-bright or gradually-dark effect under the driving of the pwm signal to be processed, but quickly passes through a low-brightness segment in the respiratory effect and directly enters a high-brightness segment, and the low-brightness segment of the respiratory effect occupies too low a ratio in the whole time period, resulting in an abrupt and unsmooth respiratory effect. The pulse width modulation signal to be processed is charged for the first capacitor through the first resistor, the RC charging circuit is formed by the first resistor and the first capacitor at the moment, the purpose of gradually rising voltage is achieved, the pulse width modulation signal to be processed is changed from a square wave signal to a ramp signal, the time occupation ratio of a low-brightness section of the LED light source in the whole breathing effect time period is increased, the problem that the whole brightness change process is not smooth due to the fact that the time occupation ratio of the low-brightness section of the LED light source is low is solved, and the whole impression of the breathing effect is improved. Meanwhile, the output voltage of the operational amplifier is fed back to the negative input end of the operational amplifier to form a follower, so that the waveform after the voltage is gradually increased is output after being followed by the operational amplifier, the driving capability of the voltage gradual increasing module is increased, and the voltage gradual increasing module can drive a linear driving circuit at the rear end.

In one embodiment, the LED light source respiration effect adjusting circuit further includes a delay module, connected to the voltage ramp-up module, and configured to perform duty cycle adjustment on the received first pulse width modulation signal to obtain a second pulse width modulation signal delayed by a preset time compared to the first pulse width modulation signal.

In the above-mentioned embodiment of the LED light source respiration effect adjusting circuit, since the BCM of the car manufacturer will send out the pulse width modulation signal with fixed frequency and increasing or decreasing duty ratio (depending on the effect of dimming or dimming), the duty ratio of the next gear larger than 0% is not necessarily 1%, and some host manufacturers are 6%. That is, the duty ratio is suddenly changed from 0% to 6%, and then gradually increased to 100%, or gradually decreased from 100% to 6%, and then suddenly changed to 0%, that is, there is a sudden change process between the gears with different duty ratios, which results in the breathing effect of the LED light source being suddenly turned on or off. Through setting up the time delay module, avoided the problem of first pulse width modulation signal duty cycle kick for its duty cycle can step by step slowly, for example step by step to 1% from 0%, thereby avoid appearing suddenly bright or suddenly dim at the in-process of respiratory, make whole respiratory more smooth and fluent.

In one embodiment, the LED light source respiration effect adjusting circuit further includes a constant voltage circuit, and the constant voltage circuit is connected to the delay module, and is configured to convert a power voltage into the first pulse width modulation signal after performing a constant voltage process.

In the above-described embodiment of the LED light source respiration effect adjusting circuit, the high-level voltage of the pulse width modulation signal waveform output by the BCM is stepped down to the first pulse width modulation signal by providing the constant voltage circuit.

In one embodiment, the delay module comprises:

the second resistor comprises a first end and a second end which are opposite, and the first end of the second resistor receives the first pulse width modulation signal;

the positive plate of the second capacitor is connected with the second end of the second resistor;

the negative input end of the comparator is connected with the second end of the second resistor and the positive plate of the second capacitor;

a base electrode of the triode is connected with an output end of the comparator, a collector electrode of the triode is connected with the first pulse width modulation signal, and an emitter electrode of the triode is connected with the first resistor and used for outputting the second pulse width modulation signal to the first resistor as the pulse width modulation signal to be processed;

the first end of the third resistor is connected with the positive input end of the comparator, and the second end of the third resistor is grounded;

and the fourth resistor comprises a first end and a second end which are opposite, the first end of the fourth resistor is connected with the positive input end of the comparator, and the second end of the fourth resistor is connected with the first pulse width modulation signal.

In the above embodiment, the second resistor and the second capacitor form an RC charging circuit, the third resistor and the fourth resistor are used to set a detection threshold, and when the second capacitor is charged to the detection threshold, the comparator operates, and the transistor is turned on, so that the delay module completes the delay function. Specifically, the sizes of the second resistor, the second capacitor, the third resistor and the fourth resistor can be set according to actual requirements, and the setting is used for setting specific delay time.

In one embodiment, the transistor comprises an NPN transistor.

In one embodiment, the LED light source respiration effect adjusting circuit further includes:

and the discharging module is connected with the time delay module and the voltage slow-rising module and used for releasing the electric energy stored in the time delay module and the voltage slow-rising module so as to reset time delay and integral.

In one embodiment, the discharge module includes:

the anode of the first diode is connected with the second end of the first resistor;

the first end of the fifth resistor is connected with the cathode of the first diode and the power supply voltage, and the second end of the fifth resistor is grounded;

and the anode of the second diode is connected with the second end of the second resistor, and the cathode of the second diode is connected with the power supply voltage and the first end of the fifth resistor.

In the above-described embodiment of the LED light source respiration effect adjusting circuit, when the pulse width modulation signal output by the BCM is a low level signal, the first diode and the second diode in the discharging module are turned on to release the electric energy stored in the first capacitor and the second capacitor, so as to achieve resetting of the delay and the integral.

In one embodiment, the LED light source respiration effect adjusting circuit further includes a processing module, connected to the voltage ramp-up module, and configured to perform duty cycle adjustment on the received first pulse width modulation signal to obtain a second pulse width modulation signal delayed by a preset time compared to the first pulse width modulation signal, and transmit the second pulse width modulation signal to the voltage ramp-up module as the to-be-processed pulse width modulation signal.

In the above-described LED light source respiration effect adjusting circuit, the output of the DAC (digital-to-analog conversion circuit) is realized by using the processing module and adding simple RC filtering, thereby saving the cost.

In one embodiment, the processing module is further configured to reset when the first pwm signal is at a low level.

In the above-described embodiment of the LED light source respiration effect adjusting circuit, when the first pwm signal is at a low level, the processing module resets, and thus, the discharging module is not required to perform a delayed reset process.

A second aspect of the present application provides an LED light source driving circuit, comprising the LED light source respiration effect adjusting circuit according to any one of the embodiments of the present application;

and the input end of the linear driving circuit is connected with the output end of the operational amplifier.

In one embodiment, the linear driving circuit includes:

the linear output module comprises a first input end and a second input end, and the first input end of the linear output module is connected with the output end of the operational amplifier;

the input end of the LED load is connected with the output end of the linear output module;

the input end of the load current feedback unit is connected with the LED load;

the input end of the load voltage feedback unit is connected with the output end of the load current feedback unit, and the output end of the load voltage feedback unit is connected with the linear output module.

In one embodiment, the linear output module further comprises a third input terminal; the LED light source driving circuit further comprises a power supply input module, and the power supply input end is connected with a third input end of the linear output module.

The LED light source respiration effect adjusting circuit and the LED light source driving circuit can enable the respiration effect process of the LED light source to be smooth, avoid the problem of flickering or darkening and improve the overall impression of the respiration effect of the LED light source.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 to 4 are schematic structural diagrams of a respiration effect adjusting circuit of an LED light source provided in some embodiments of the present application.

Fig. 5 is a schematic structural diagram of an LED light source driving circuit provided in an embodiment of the present application.

Fig. 6 to 7 are schematic circuit diagrams of a respiration adjustment circuit of an LED light source provided in some embodiments of the present application.

Fig. 8 is a flowchart illustrating the operation of the LED light source respiration effect adjusting circuit provided in an embodiment of the present application.

Description of reference numerals:

the LED light source control circuit comprises a 1-LED light source respiration effect adjusting circuit, a 10-voltage slow-rising module, a 11-time delay module, a 12-constant voltage circuit, a 13-discharging module, a 2-LED light source driving circuit, a 20-linear output module, a 21-LED load, a 22-load feedback current unit, a 23-load feedback voltage unit, a 24-power supply input module and a 25-processing module.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.

It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.

In an embodiment of the present application, as shown in fig. 1, an LED light source respiration effect adjusting circuit 1 is provided, which includes a voltage ramp-up module 10, please refer to fig. 6, in which the voltage ramp-up module 10 includes a first resistor R1, a first capacitor C1, and an operational amplifier U1A. The first resistor R1 comprises a first end and a second end which are opposite, and the first end of the first resistor R1 receives the pulse width modulation signal to be processed; the positive plate of the first capacitor C1 is connected with the second end of the first resistor R1, and the negative plate of the first capacitor C1 is grounded; the positive input terminal of the operational amplifier U1A is connected to the second terminal of the first resistor R1 and the positive plate of the first capacitor C1, and the output terminal of the operational amplifier U1A is shorted to the negative input terminal of the operational amplifier U1A.

Optionally, the output terminal of the operational amplifier U1A and the negative input terminal of the operational amplifier U1A may be directly short-circuited, or may be fed back to the negative input terminal through a resistor, which is not limited in this application.

Specifically, in the LED light source respiration effect adjusting circuit 1 in the above embodiment, since the pulse width modulation signal to be processed is usually a square wave signal, there is a sudden change at the rising edge, which causes the respiration effect of the LED light source to be suddenly turned on or suddenly turned off; in addition, because the light emitting characteristic of the LED light source is not linear, the LED light source cannot show an ideal gradually-bright or gradually-dark effect under the driving of the pwm signal to be processed, but quickly passes through a low-brightness segment in the respiratory effect and directly enters a high-brightness segment, and the low-brightness segment of the respiratory effect occupies too low a ratio in the whole time period, resulting in an abrupt and unsmooth respiratory effect. The pulse width modulation signal to be processed is charged for the first capacitor C1 through the first resistor R1, at the moment, the first resistor R1 and the first capacitor C1 form an RC charging circuit, the purpose of gradually rising voltage is achieved, the pulse width modulation signal to be processed is changed from a square wave signal into a ramp signal, the time ratio of a low-brightness section of the LED light source in the whole breathing effect time period is increased, the problem that the whole brightness change process is not smooth due to the fact that the time ratio of the low-brightness section of the LED light source is low is solved, and the whole impression of the breathing effect is improved. Meanwhile, the output voltage of the operational amplifier U1A is fed back to the negative input end of the operational amplifier U1A to form a follower, so that the waveform after the voltage ramp-up is output after being followed by the operational amplifier U1A, the driving capability of the voltage ramp-up module 10 is increased, and the voltage ramp-up module 10 can drive a linear driving circuit at the rear end.

Further, in the LED light source respiration effect adjusting circuit 1 provided in an embodiment of the present application, as shown in fig. 2, the circuit further includes a delay module 11, connected to the voltage ramp-up module 10, for performing duty ratio adjustment on the received first pulse width modulation signal to obtain a second pulse width modulation signal delayed by a preset time compared to the first pulse width modulation signal.

Specifically, referring to fig. 6, the delay module 11 provided in an embodiment of the present application includes a second resistor R2, a second capacitor C2, a comparator U1B, a transistor Q1, a third resistor R3, and a fourth resistor R4. The second resistor R2 comprises a first end and a second end which are opposite, and the first end of the second resistor R2 receives the first pulse width modulation signal; the positive plate of the second capacitor C2 is connected with the second end of the second resistor; the negative input end of the comparator U1B is connected with the second end of the second resistor R2 and the positive plate of the second capacitor C1; the base of the triode Q1 is connected with the output end of the comparator U1B, the collector of the triode Q1 is connected with the first pulse width modulation signal, and the emitter of the triode Q1 is connected with the first resistor R1, and is configured to output the second pulse width modulation signal to the first resistor R1 as the pulse width modulation signal to be processed; the third resistor R3 includes a first end and a second end opposite to each other, the first end of the third resistor R3 is connected to the positive input end of the comparator U1B, and the second end of the third resistor R3 is grounded; the fourth resistor R4 includes opposite first and second ends, the first end of the fourth resistor R4 is connected to the positive input terminal of the comparator U1B, and the second end of the fourth resistor R4 is connected to the first pwm signal.

Optionally, the transistor Q1 comprises an NPN transistor.

Specifically, in the LED light source respiration effect adjusting circuit 1 in the above embodiment, the second resistor R2 and the second capacitor C2 form an RC charging circuit, the third resistor R3 and the fourth resistor R4 are used to set a detection threshold, and when the second capacitor C2 charges to the detection threshold, the comparator operates, and at this time, the triode is turned on, so that the delay module completes the delay function.

Optionally, the preset time may be adjusted adaptively according to the duty ratio of the pulse width modulation signal sent by the BCM and an ideal duty ratio stepping speed, specifically, the sizes of the second resistor R2, the second capacitor C2, the third resistor R3, and the fourth resistor R4 may be set according to actual requirements, so as to set a specific delay time, that is, the delay time may be set according to the sizes of the second resistor R2, the second capacitor C2, the third resistor R3, and the fourth resistor R4.

Specifically, in the LED light source respiration effect adjusting circuit 1 in the above embodiment, since the BCM of the car manufacturer may send out the pulse width modulation signal with fixed frequency and increasing or decreasing duty ratio (depending on the effect of dimming or dimming), the duty ratio of the next gear larger than 0% is not necessarily 1%, and some host manufacturers are 6%. That is, the duty ratio is suddenly changed from 0% to 6%, and then gradually increased to 100%, or gradually decreased from 100% to 6%, and then suddenly changed to 0%, that is, there is a sudden change process between the gears with different duty ratios, which results in the breathing effect of the LED light source being suddenly turned on or off. Through setting up the time delay module, avoided the problem of first pulse width modulation signal duty cycle kick for its duty cycle can step by step slowly, for example step by step to 1% from 0%, thereby avoid appearing suddenly bright or suddenly dim at the in-process of respiratory, make whole respiratory more smooth and fluent.

Further, in the respiration effect adjusting circuit 1 of the LED light source provided in an embodiment of the present application, as shown in fig. 3, the respiration effect adjusting circuit further includes a constant voltage circuit 12, where the constant voltage circuit 12 is connected to the delay module 11, and is configured to convert the power voltage into the first pwm signal after performing a constant voltage process.

Specifically, in the LED light source respiration effect adjusting circuit 1 in the above embodiment, the constant voltage circuit 13 is provided to step down the high level voltage of the pulse width modulation signal waveform output by the BCM into the first pulse width modulation signal.

Optionally, when the delay module 11 is not arranged in the LED light source respiratory effect adjusting circuit 1, the constant voltage circuit 12 may be directly connected to the voltage ramp module 10, and the application does not limit the connection manner between the constant voltage circuit and the voltage ramp module or the delay module.

Further, in the respiration adjustment circuit 1 of the LED light source provided in an embodiment of the present application, as shown in fig. 4, a discharging module 13 is further included, connected to the delay module 11 and the voltage ramp-up module 10, for discharging the electric energy stored in the delay module 11 and the voltage ramp-up module 10 to achieve resetting of delay and integration.

Specifically, in the discharge module 13 provided in an embodiment of the present application, please continue to refer to fig. 6, which includes the first diode D1, the fifth resistor R5, and the second diode D2. The anode of the first diode D1 is connected to the second end of the second resistor R2; the fifth resistor R5 includes a first end and a second end opposite to each other, the first end of the fifth resistor R5 is connected to the negative terminal of the first diode D1 and the power voltage, and the second end of the fifth resistor R5 is grounded; the anode of the second diode D2 is connected to the second end of the second resistor R2, and the cathode of the second diode D2 is connected to the power supply voltage and the first end of the fifth resistor R5.

Specifically, in the LED light source respiration effect adjusting circuit 1 in the above embodiment, when the pulse width modulation signal output by the BCM is a low level signal, the first diode D1 and the second diode D2 in the discharging module 13 are turned on, so as to release the electric energy stored in the first capacitor C1 and the second capacitor C2, and achieve resetting of time delay and integration.

In another embodiment, as shown in fig. 7, the LED light source respiration effect adjusting circuit 1 further includes a processing module 25, and the processing module 25 is connected to the voltage ramp-up module 10, and is configured to perform duty ratio adjustment on the received first pulse width modulation signal to obtain a second pulse width modulation signal delayed by a preset time compared to the first pulse width modulation signal, and transmit the second pulse width modulation signal to the voltage ramp-up module 10 as the to-be-processed pulse width modulation signal.

Specifically, in the LED light source respiration effect adjusting circuit 1 in the above embodiment, the output of the DAC (digital-to-analog conversion circuit) is realized by using the processing module and adding a simple RC filter, so as to save the cost.

Optionally, the processing module 1 may be an MCU (single chip microcomputer), and the processing module 1 may include any existing MCU capable of implementing the above functions, and the type of the MCU is not limited.

Further, the processing module 25 provided in an embodiment of the present application is further configured to reset when the first pwm signal is at a low level.

Specifically, in the LED light source respiration effect adjusting circuit 1 in the above embodiment, when the first pwm signal is at a low level, the processing module 25 is reset, so that the discharging module is not required to perform a delayed reset process.

Optionally, the processing module 25 includes an input end, a first output end, a second output end and a third output end, where the third output end is an ADC (analog-to-digital converter) output end; the input end of the processing module 25 is connected with the output end of the constant voltage circuit, the first output end of the processing module 25 is connected with the first end of the first resistor R1, the second output end of the processing module 25 is connected with the positive plate of the first capacitor C1, and the third output end of the processing module 25 is connected with the negative input end of the operational amplifier U1A; the processing module 25 is further configured to perform feedback monitoring on the voltage ramp-up module 10, control a slope of the voltage ramp-up, and prevent voltage overshoot.

Specifically, referring to fig. 8, the operation process of the LED light source respiration effect adjusting circuit 1 provided in one embodiment of the present application is as follows:

s1: when the first pwm signal changes from low level to high level, the processing module 25 starts;

s2: discharging the first capacitor C1 and starting delay timing;

s3: after the time delay is finished, stopping discharging the first capacitor C1;

s4: the processing module 25 outputs a second pwm signal;

s5: feedback monitoring of Vout by the ADC and regulation of the processing module 25;

s6: and the voltage is gradually increased, the output of the processing module 25 is constant, and the output voltage is stabilized.

Specifically, in the LED light source respiration effect adjusting circuit 1 in the above embodiment, the ADC is arranged to perform feedback monitoring on Vout, so that the processing module 25 is prevented from outputting an excessively high voltage, and the control accuracy is improved.

Another embodiment of the present application provides an LED light source driving circuit, including the LED light source respiration effect adjusting circuit 1 according to any one of the embodiments of the present application; and a linear driving circuit 2, wherein the input end of the linear driving circuit 2 is connected with the output end of the operational amplifier U1A.

Specifically, the LED light source driving circuit provided in one embodiment of the present application includes, as shown in fig. 5, a linear output module 20, an LED load 21, a load current feedback unit 22, and a load voltage feedback unit 23. The linear output module 20 includes a first input end and a second input end, and the first input end of the linear output module 20 is connected to the output end of the operational amplifier U1A; the input end of the LED load 21 is connected to the output end of the linear output module 20; the input end of the load current feedback unit 22 is connected with the LED load 21; the input end of the load voltage feedback unit 23 is connected to the output end of the load current feedback unit 22, and the output end of the load voltage feedback unit 23 is connected to the linear output module 20.

Specifically, in the LED light source driving circuit provided in one embodiment of the present application, please continue to refer to fig. 5, the linear output module 20 further includes a third input end; the LED light source driving circuit further comprises a power input module 24, and the power input module 24 is connected to the third input terminal of the linear output module 20.

The LED light source driving circuit in the embodiment can enable the breathing effect process of the LED light source to be smooth, avoid the problem of flickering or dimming, and improve the overall impression of the breathing effect of the LED light source.

In the description herein, reference to the description of "one of the embodiments", "another embodiment", or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one of the embodiments or examples of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The LED light source respiration effect regulating circuit is characterized by comprising a voltage ramp-up module, wherein the voltage ramp-up module comprises:

the first resistor comprises a first end and a second end which are opposite, and the first end of the first resistor receives a pulse width modulation signal to be processed;

the positive plate of the first capacitor is connected with the second end of the first resistor, and the negative plate of the first capacitor is grounded;

and the positive input end of the operational amplifier is connected with the second end of the first resistor and the positive plate of the first capacitor, and the output end of the operational amplifier is in short circuit with the negative input end of the operational amplifier.

2. The LED light source respiration effect regulating circuit according to claim 1, further comprising a delay module connected to the voltage ramp-up module for performing duty cycle regulation on the received first pulse width modulation signal to obtain a second pulse width modulation signal delayed by a preset time compared to the first pulse width modulation signal.

3. The LED light source respiration effect adjusting circuit according to claim 2, further comprising a constant voltage circuit, wherein the constant voltage circuit is connected to the delay module, and is configured to convert a power voltage into the first pulse width modulation signal after performing a constant voltage process.

4. The LED light source respiration effect adjustment circuit of claim 2, wherein the delay module comprises:

the second resistor comprises a first end and a second end which are opposite, and the first end of the second resistor receives the first pulse width modulation signal;

the positive plate of the second capacitor is connected with the second end of the second resistor;

the negative input end of the comparator is connected with the second end of the second resistor and the positive plate of the second capacitor;

a base electrode of the triode is connected with an output end of the comparator, a collector electrode of the triode is connected with the first pulse width modulation signal, and an emitter electrode of the triode is connected with the first resistor and used for outputting the second pulse width modulation signal to the first resistor as the pulse width modulation signal to be processed;

the first end of the third resistor is connected with the positive input end of the comparator, and the second end of the third resistor is grounded;

and the fourth resistor comprises a first end and a second end which are opposite, the first end of the fourth resistor is connected with the positive input end of the comparator, and the second end of the fourth resistor is connected with the first pulse width modulation signal.

5. The LED light source breathing effect adjustment circuit of claim 4, further comprising:

and the discharging module is connected with the time delay module and the voltage slow-rising module and used for releasing the electric energy stored in the time delay module and the voltage slow-rising module so as to reset time delay and integral.

6. The LED light source respiration effect adjustment circuit of claim 5, wherein the discharge module comprises:

the anode of the first diode is connected with the second end of the first resistor;

the first end of the fifth resistor is connected with the cathode of the first diode and the power supply voltage, and the second end of the fifth resistor is grounded;

and the anode of the second diode is connected with the second end of the second resistor, and the cathode of the second diode is connected with the power supply voltage and the first end of the fifth resistor.

7. The LED light source respiration effect adjusting circuit according to claim 1, further comprising a processing module, connected to the voltage ramp-up module, for performing duty cycle adjustment on the received first pulse width modulation signal to obtain a second pulse width modulation signal delayed by a preset time compared to the first pulse width modulation signal, and transmitting the second pulse width modulation signal to the voltage ramp-up module as the to-be-processed pulse width modulation signal.

8. The LED light source respiration effect adjustment circuit of claim 7, wherein the processing module is further configured to reset when the first pulse width modulation signal is at a low level.

9. An LED light source driving circuit, comprising:

the LED light source breathing effect adjusting circuit of any of claims 1-6;

and the input end of the linear driving circuit is connected with the output end of the operational amplifier.

10. The LED light source driver circuit of claim 9, wherein the linear driver circuit comprises:

the linear output module comprises a first input end and a second input end, and the first input end of the linear output module is connected with the output end of the operational amplifier;

the input end of the LED load is connected with the output end of the linear output module;

the input end of the load current feedback unit is connected with the LED load;

the input end of the load voltage feedback unit is connected with the output end of the load current feedback unit, and the output end of the load voltage feedback unit is connected with the linear output module.

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