CN116133192A

CN116133192A - Light source driving device, light source brightness adjusting method and system

Info

Publication number: CN116133192A
Application number: CN202310111499.2A
Authority: CN
Inventors: 岑嘉明; 代合隆
Original assignee: Guangzhou Hengyao Electric Energy Industry Co ltd
Current assignee: Guangzhou Green Energy Manufacturing Co ltd
Priority date: 2023-02-10
Filing date: 2023-02-10
Publication date: 2023-05-16

Abstract

The application discloses a driving device of a light source, a light source brightness adjustment method and system and a solar power supply system, which can avoid stroboscopic when realizing light source brightness adjustment. The driving device of the light source comprises: a light source driving die and a dimming module; the output end of the dimming module is connected with the feedback end of the light source driving module, and the generated dimming voltage signal is transmitted to the feedback end, wherein the dimming voltage signal has a voltage value matched with a preset light source brightness gear mode; the power supply input end of the light source driving module receives the direct-current voltage signal, the feedback end is used for receiving and outputting a feedback signal, and the output feedback signal is a voltage signal determined according to the driving voltage signal output by the output end of the light source driving module; the light source driving module performs voltage conversion on the direct-current voltage signal according to the dimming voltage signal and the output feedback signal to obtain a driving voltage signal for adjusting the brightness of the light source; the light source driving module continuously outputs a driving voltage signal matched with the light source brightness gear mode.

Description

Light source driving device, light source brightness adjusting method and system

Technical Field

The application relates to the field of light source driving, in particular to a light source driving device, a light source brightness adjusting method and system and a solar power supply system.

Background

The vision produced by light on the retina remains for a period of time after the light ceases, a phenomenon known as persistence of vision (persistence of vision). When the brightness of the light source needs to be adjusted, the persistence of vision phenomenon is utilized, and the light source is controlled to generate stroboscopic effect, namely the light source flickers at an extremely high speed, so that the brightness perceived by human eyes can be reduced. The brightness perceived by people is different by adjusting the proportion of the luminous time length of the light source in one period, so that the effect of adjusting the brightness of the light source can be achieved.

The stroboscopic effect is not felt by the visually people, but the stroboscopic effect can cause a plurality of problems such as headache, eye fatigue, attention reduction, vision deterioration and the like. How to avoid stroboscopic when the light source brightness is adjustable is a problem to be solved.

Disclosure of Invention

The application provides a driving device of a light source, a light source brightness adjustment method and system and a solar power supply system, which can avoid stroboscopic when realizing light source brightness adjustment.

An embodiment of the present application provides a driving device for a light source, including: a light source driving module and a dimming module;

the output end of the dimming module is connected with the feedback end of the light source driving module and is used for transmitting a generated dimming voltage signal to the feedback end, and the dimming voltage signal has a voltage value matched with a preset light source brightness gear mode;

The power supply input end of the light source driving module receives a direct-current voltage signal, the feedback end is used for receiving an output feedback signal, and the output feedback signal is a voltage signal determined according to a driving voltage signal output by the output end of the light source driving module; the light source driving module performs voltage conversion on the direct-current voltage signal according to the dimming voltage signal and the output feedback signal to obtain the driving voltage signal for adjusting the brightness of the light source; and the light source driving module continuously outputs the driving voltage signal matched with the light source brightness gear mode under the state of switching the light source brightness gear mode and/or the light source brightness gear mode.

Optionally, the dimming module comprises a first-order low-pass filter circuit or a second-order low-pass filter circuit, and a signal generating device;

the signal generating device transmits the generated dimming reference signal to the first-order low-pass filter circuit or the second-order low-pass filter circuit for filtering processing to obtain the dimming voltage signal;

the first-order low-pass filter circuit comprises a first resistor and a first capacitor, wherein the input end of the first resistor receives the dimming reference signal, and the output end of the first resistor is respectively connected with one end of the first capacitor and the feedback end; the other end of the first capacitor is grounded;

The second-order low-pass filter circuit comprises a second resistor, a second capacitor, a third resistor and a third capacitor, wherein the input end of the second resistor receives the dimming reference signal, the output end of the second resistor is connected with one end of the third resistor and one end of the first capacitor, the other end of the second capacitor is grounded, the other end of the third resistor is connected with the feedback end and one end of the third capacitor, and the other end of the third capacitor is grounded.

Optionally, the dimming reference signal is a PWM wave, and the light source brightness shift mode includes at least two brightness shifts;

and the signal generating device sets the target duty ratio corresponding to the current brightness gear to the duty ratio of the dimming reference signal according to the corresponding relation between the brightness gear and the PWM wave duty ratio.

Optionally, the system further comprises: the output end of the voltage feedback module is connected with the feedback end and is used for transmitting the output feedback signal to the feedback end; the input end of the voltage feedback module is connected with the output end of the light source driving module and is used for receiving the driving voltage signal, and the voltage feedback module is used for generating the output feedback signal according to the driving voltage signal.

Optionally, the voltage feedback module includes: a first voltage dividing circuit and/or a second voltage dividing circuit; the first voltage dividing circuit includes: the input end of the first voltage dividing resistor receives the driving voltage signal, the second voltage dividing circuit comprises a second voltage dividing resistor, and one end of the second voltage dividing circuit is connected with the ground end;

when the voltage feedback module comprises the first voltage dividing circuit and the second voltage dividing circuit, the first voltage dividing circuit and the second voltage dividing circuit are connected in series, a node connecting the first voltage dividing circuit and the second voltage dividing circuit is connected with the feedback end, and the voltage feedback module takes the divided voltage signal obtained by dividing the driving voltage signal as the output feedback signal. To the feedback end.

Optionally, the system further comprises: the detection module and the light source are connected in series between the output end of the light source driving module and the ground end;

the dimming module is used for adjusting the dimming voltage signal according to the current flowing through the detection module.

Optionally, the detection module includes a first detection branch and a second detection branch connected in parallel;

The first detection branch circuit comprises a first detection resistor, and two ends of the first detection resistor are respectively connected with the input end and the output end of the first detection branch circuit;

the second detection branch circuit comprises a second detection resistor and a switching element which are connected in series between an input end and an output end of the second detection branch circuit, and the resistance value of the second detection resistor is smaller than that of the first detection resistor;

the dimming module is used for controlling the switching element to be conducted and determining the current flowing through the detection module according to the second voltage at the two ends of the second detection resistor; and under the condition that the second voltage is smaller than a preset voltage, controlling the switching element to be turned off, and determining the current flowing through the detection module according to the first voltage at the two ends of the first detection resistor.

The embodiment of the application provides a light source brightness adjustment system, which comprises: a light source and a driving device for the light source as described above.

The embodiment of the application provides a light source brightness adjustment method, which comprises the following steps:

the method comprises the steps that a dimming voltage signal generated by a dimming module is obtained through a feedback end, the dimming voltage signal has a voltage value matched with a light source brightness gear mode, the feedback end is used for receiving an output feedback signal, and the output feedback signal is a voltage signal determined according to a driving voltage signal output by an output end of a light source driving module;

And according to the dimming voltage signal and the output feedback signal, performing voltage conversion on the direct-current voltage signal received by the power input end to obtain the driving voltage signal for adjusting the brightness of the light source, wherein the light source driving module continuously outputs the driving voltage signal matched with the light source brightness gear mode in the state of switching the light source brightness gear mode and/or the light source brightness gear mode.

The embodiment of the application provides a solar power supply system, which comprises: the solar power supply end and the lamp switch are arranged in the lamp box; the energy of the dimming voltage signal and the direct current voltage signal is derived from the solar power supply end.

In the light source brightness adjustment system provided by the application, the light source driving module converts the direct-current voltage signal received by the power input end according to the signal received by the feedback end to obtain a driving voltage signal. And transmitting the dimming voltage signal generated by the dimming module to a feedback end of the light source driving module, so that the signal received by the feedback end changes along with the change of the dimming voltage signal, and the driving voltage signal changes. The light-emitting brightness of the light source changes along with the change of the driving voltage signal, so that the light-emitting brightness of the light source can be adjusted by adjusting the dimming voltage signal.

In the light source brightness shift mode, the light source brightness shift is unchanged. Under the condition that the brightness gear of the light source is unchanged, namely the dimming voltage signal is unchanged, the light source driving module continuously outputs a stable driving voltage signal. And in the state of switching the light source brightness gear mode, switching the light source brightness gear. In the process of switching the brightness gear of the light source, the dimming voltage signal changes, the driving voltage signal changes, but the light source driving module continuously outputs the driving voltage signal. The driving voltage signal is continuous, and the light emission of the light source is continuous, so that the stroboscopic effect of the light source is avoided.

Drawings

FIG. 1 is a schematic block diagram of a drive apparatus;

fig. 2 is a schematic view of a dimming principle of the driving apparatus shown in fig. 1;

fig. 3 is a schematic structural view of a driving device for a light source according to an embodiment of the present application;

fig. 4 is a schematic diagram of a circuit structure of a light source brightness adjustment system according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of a dimming principle of a light source brightness adjustment system according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of another circuit structure of the light source brightness adjustment system according to the embodiment of the present application;

Fig. 7 is a schematic diagram of a dimming principle of a light source brightness adjustment system according to an embodiment of the present disclosure;

fig. 8 is a schematic flowchart of a light source brightness adjustment method provided in an embodiment of the present application;

fig. 9 is a schematic block diagram of a solar power supply system according to an embodiment of the present application.

Detailed Description

To make the objects, advantages and features of the present application more apparent, the technical solutions in the present application will be further described in detail below with reference to the accompanying drawings and detailed description. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application, however, may be embodied in many other forms than described herein and similarly practiced by those skilled in the art without departing from the spirit or essential characteristics thereof, and is therefore not limited to the specific embodiments disclosed below.

It should be noted that in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, as well as a particular order or sequence. The terms "equal," "same," and the like are not strictly limited in mathematical and/or geometric sense, but also include tolerances which are to be understood by those skilled in the art and which are to be permitted by the manufacture or use of the same. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Furthermore, in the description of the present application, unless otherwise indicated, the term "plurality" refers to two or more. The term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may represent: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

Vision is actually imaging the lens of the eye, the photoreceptor cells are sensitized, and the light signals are converted into nerve currents which are transmitted back to the brain to cause vision in the human body. The photoreceptor cells are sensitized with a few photoreceptor colors, and the formation of photoreceptor colors takes a certain time. Thus, the vision produced by light on the retina remains for a period of time after the light ceases to act, a phenomenon known as persistence of vision (persistence of vision).

By using the persistence of vision, a light source composed of light-emitting diodes (LEDs) can be driven by using pulse width modulation (pulse width modulation, PWM) signals, so that the LEDs in the light source are frequently turned on and off. In the process of driving the light source by the PWM signal, the light source does not emit light continuously, but blinks at an extremely high speed, but the blinks of the light source are not visually perceived due to the persistence of vision. The brightness perceived by human eyes can be adjusted by controlling the duty ratio of the PWM signal, i.e. the proportion of the time length of turning on and off the LEDs in the light source. The light source luminance perceived by the human eye can be understood as the luminous luminance of the light source. The mode of driving the light source by using the PWM signal is relatively low in cost and beneficial to adjusting the brightness of the lamp light.

Fig. 1 is a schematic structural view of a driving apparatus.

The driving device 100 includes a Direct Current (DC)/DC conversion chip 110, an inductor L ₁₁ Conversion capacitor C ₁₁ Input capacitance C _IN1 Output capacitance C _OUT1 A first voltage dividing resistor R ₁₁ Second voltage-dividing resistor R ₁₂ 。

The pins of the chip 110 include a Feedback (FB) pin, an Enable (EN) pin, an Input (IN) pin, a Switch (SW) pin, a Bootstrap (BS) pin, a Ground (GND) pin, and the like.

The GND pin is connected to the ground potential. Input capacitance C _IN1 Is connected to the IN pin at one end and to ground at the other end. Conversion capacitor C ₁₁ Is connected to the BS pin and the SW pin, respectively. Inductance L ₁₁ Is connected to the SW pin and the output O1 node of the driving device 100, respectively. A first voltage dividing resistor R ₁₁ Is connected to the SW pin and the FB pin, respectively. Output capacitor C _OUT1 Is connected to the O1 node and ground potential, respectively. Second voltage-dividing resistor R ₁₂ Is connected to the FB pin and ground, respectively.

DC input voltage V _IN To the IN pin.

The chip 110 includes an operation unit and a switching device. Switching device and capacitor C in chip 110 ₁₁ Inductance L ₁₁ The voltage conversion circuit formed by the devices is used for realizing direct current voltage conversion. The power output by the voltage conversion circuit is constant.

When the signal received by the EN pin is at high level, the voltage conversion circuit inputs the input voltage V to the IN pin _IN1 Performing DC voltage conversion to obtain converted DC output voltage V _OUT1 . Output voltage V _OUT1 For driving the light source as a load. The light source includes at least one LED string, and in the case where the number of LED strings in the light source is plural, the plural LED strings are connected in parallel. Each LED string may include one or more LEDs.

Resistor R ₁₁ And resistance R ₁₂ The devices form a voltage dividing circuit, and the resistor R ₁₁ And resistance R ₁₂ The voltage division node between the voltage division nodes is connected with the FB pin. Output voltage V _OUT1 The voltage value at the voltage division node is transmitted to the FB pin. The operation unit controls the on and off of the switching devices in the chip 110 according to the voltage value of the FB pin to adjust the input voltage V _IN1 To adjust the output voltage V _OUT1 。

The signal received at the FB pin may be referred to as an output feedback signal. The voltage value of the output feedback signal is equal to the voltage value of the voltage dividing node according to the output voltage V _OUT1 Obtained and output voltage V _OUT1 Proportional to the ratio. The voltage value of the voltage division node can be understood as the output power of the voltage division circuitPressure V _OUT1 Is a partial pressure result of (a). Adjusting the input voltage V according to the voltage value of the FB pin _IN1 So that the result of the DC/DC conversion, i.e. the output voltage V _OUT1 Stabilize at a certain voltage value, i.e. at V _IN1 In the case of a change, the output voltage V _OUT1 Remain unchanged.

Illustratively, the operation unit includes a comparator for comparing the voltage value of the FB pin with a preset reference voltage value, and controls the on/off of the switching device in the chip 110 according to the comparison result of the voltage value of the FB pin and the reference voltage value, so as to output the voltage V _OUT1 Stable at the certain voltage value.

The PWM signal may be a rectangular wave formed by controlling the output time of the high and low levels. A PWM signal may be understood as a voltage signal. Fig. 1 shows waveforms of PWM signals.

Transmitting PWM signal to EN pin, when high level of PWM signal is transmitted to EN pin, the voltage of O1 node is V of voltage conversion circuit pair _IN Output voltage V obtained by DC voltage conversion _OUT The method comprises the steps of carrying out a first treatment on the surface of the When the low level of the PWM signal is transmitted to the EN pin, the voltage conversion circuit does not perform voltage conversion, and the voltage of the O1 node is 0 corresponding to the ground potential.

The LED may also be referred to as a lamp bead, having a conductive characteristic. That is, when the voltage applied across the LED is greater than the on voltage, the LED may be turned on to emit light. And, the brightness of the LED is proportional to the current flowing through the LED. And the magnitude of the voltage applied across the LED determines the maximum current flowing through the LED. That is, in the case where the voltage applied across the LED is not changed, the maximum current flowing through the LED is limited.

Due to input voltage V _IN Is stable, and when the EN pin receives high level, outputs voltage V _OUT The voltage value of (2) is stable. Therefore, when the EN pin receives a high level, the brightness of the light source as a load is not changed.

The duty ratio of the PWM signal may represent a time ratio in which a high level of the PWM signal occupies within one PWM period. In one PWM period, the LEDs in the light source are turned on to emit light for the time period with the time proportion being the duty ratio, and the LEDs are turned off to emit no light for other time periods.

The perceived brightness of the LED assembly can be adjusted by controlling the duty cycle of the EN pin PWM signal. Due to the persistence of vision phenomenon, a person can not feel flickering of the LED visually, and the perceived brightness of the LED component sensed by the human eyes is positively related to the brightness and the duty ratio of the LED in the light source when the LED is conducted and emits light. For example, perceived brightness of a light source perceived by the human eye may be expressed as the product of the light emission brightness of the light source and the PWM signal duty cycle.

As shown in fig. 2, the PWM signal may be generated by a single chip microcomputer. The PWM signal is transmitted to the EN terminal of the driving device 100, and the EN terminal of the driving device 100 can be understood as the EN pin of the chip 110. By adjusting the duty ratio of the PWM signal, the voltage value of the O1 node of the driving device 100 can be adjusted to the output voltage V _OUT Thereby adjusting the light emitting time of the light source in one PWM signal period and adjusting the perceived brightness of human eyes to the light source.

Frequent flashing of the light source may be referred to as strobing. The human can not feel stroboscopic visually, but the stroboscopic can cause a plurality of problems such as headache, eye fatigue, attention reduction, vision deterioration and the like.

In order to solve the above-mentioned problems, an embodiment of the present application provides a schematic block diagram of a light source brightness adjustment system.

Fig. 3 is a schematic structural diagram of a driving device for a light source according to an embodiment of the present application.

The driving device 310 includes a light source driving module 311 and a dimming module 312. The driving means is for driving the light source 330. The driving device 310 may be located in the light source brightness adjustment system 300, the system 300 comprising a light source 330.

The output end of the dimming module 312 is connected to the feedback end of the light source driving module 311, and is used for transmitting the generated dimming voltage signal to the feedback end.

The dimming voltage signal has a voltage value matched with a preset light source brightness shift pattern. The preset light source brightness shift pattern may include a plurality of brightness shifts, and different light source brightness shifts may correspond to different voltage values of the dimming voltage signal.

The power input end of the light source driving module 311 receives the direct current voltage signal, the feedback end is used for receiving an output feedback signal, and the output feedback signal is a voltage signal determined according to the driving voltage signal output by the output end of the light source driving module.

The light source driving module 311 performs voltage conversion on the dc voltage signal according to the dimming voltage signal and the output feedback signal, to obtain the driving voltage signal for adjusting the brightness of the light source 330.

The light source driving module 311 continuously outputs the driving voltage signal matched with the light source brightness shift mode in the state of the light source brightness shift mode and/or the light source brightness shift mode switching, continuously drives the light source, and avoids the stroboscopic effect of the light source.

The light source driving module 311 converts the direct current voltage signal received by the power input end according to the signal received by the feedback end, so as to obtain a driving voltage signal. The dimming voltage signal generated by the dimming module 312 is transmitted to the feedback end of the light source driving module 311, so that the signal received by the feedback end changes with the change of the dimming voltage signal, and the driving voltage signal changes. The light emitting brightness of the light source 330 changes along with the change of the driving voltage signal, so that the light modulating voltage signal can be adjusted to realize the adjustment of the light emitting brightness of the light source 330.

Different light source brightness gears can correspond to different light source brightness, and the adjustment of the light source brightness is realized through the switching of the light source brightness gears; under the condition of fixed light source brightness gear, the light source brightness is unchanged. In the case that the light source brightness is unchanged, that is, the dimming voltage signal is unchanged, the light source driving module 311 continuously outputs a stable driving voltage signal.

In a state in which the light source brightness level is switched from one brightness level to another brightness level, the light source brightness is changed. In the process of switching the brightness gear of the light source, the dimming voltage signal changes, the driving voltage signal changes, and the light source driving module 311 still continuously outputs the driving voltage signal.

Because the continuous output of the driving voltage signal makes the light source 330 always in a light-emitting state, whether before or after brightness adjustment or during brightness adjustment, the stroboscopic effect of the light source 330 is avoided, and the flicker generated by switching the brightness shift of the light source from the current brightness to no brightness (extinction) and then to another brightness matched with the shift is avoided.

The light source driving module 311 may include a DC/DC conversion control chip and an inductor, a capacitor, and the like. The DC/DC conversion control chip may be the chip 110, the chip 410, or other chips. The connection relationship between the DC/DC conversion control chip and the inductor, capacitor, and the like can be seen from the description of fig. 4.

There are various ways in which the dimming voltage signal may be generated by the dimming module 312.

In some embodiments, the dimming module 312 may generate a dimming voltage signal that matches a preset light source brightness gear pattern. That is, the dimming module 312 generates a dc signal. The dimming voltage signal that dimming module 312 can generate has different voltage values at different light source brightness levels.

In other embodiments, the dimming module 312 may include a filtering circuit and a signal generation device.

The signal generating means is for generating a dimming reference signal. The dimming reference signal may be a signal whose voltage value varies with time.

The filter circuit filters the dimming reference signal to obtain a dimming voltage signal.

And under different light source brightness gears, the voltage value of the dimming voltage signal obtained by filtering the dimming reference signal by the filtering circuit is different.

The filter circuit may be a first order low pass filter circuit or a second order low pass filter circuit.

The first-order low-pass filter circuit comprises a first resistor and a first capacitor, wherein the input end of the first resistor receives the dimming reference signal, and the output end of the first resistor is respectively connected with one end of the first capacitor and the feedback end; the other end of the first capacitor is grounded.

The second order low pass filter circuit can be seen in particular from the description of the filter circuit 430 shown in fig. 4. The second resistor may be resistor R shown in FIG. 4 ₃₅ The second capacitor may be capacitor C shown in FIG. 4 ₃₅ The third resistor may be resistor R shown in FIG. 4 ₃₆ The third capacitor may be capacitor C shown in FIG. 4 ₃₆ 。

The resistance values of the second resistor and the third resistor influence the voltage variation range of the driving voltage signal in the duty ratio adjustment process of the PWM signal, namely, the resistance values of the second resistor and the third resistor influence the accuracy of the duty ratio of the PWM signal on the adjustment of the driving voltage signal. The resistance values of the second resistor and the third resistor can be reasonably set according to the size of the voltage variation range required by the driving voltage signal.

The filtering circuit adopts the resistive-capacitive component to realize filtering, the number of used devices is small, and the cost of the devices is low, so that the cost of the system 300 is low.

The dimming reference signal may be a PWM wave, and the light source brightness shift pattern includes at least two brightness shifts. The dimming module 312 may set the duty cycle of the dimming reference signal to the target duty cycle corresponding to the current brightness gear according to the corresponding relationship between the brightness gear and the duty cycle.

The signal generating device may be located in the single chip microcomputer shown in fig. 5.

The duty ratio of the PWM wave can be flexibly set in the range of 0% to 100%, and the realization is simpler. The PWM wave is used as the dimming reference signal, so that the dimming reference signal is simpler in implementation mode, the difficulty in implementing the voltage value of the dimming voltage signal under each brightness gear is lower, and the brightness of the light source 330 is more free to adjust.

The output feedback signal may be determined from the output voltage feedback signal and/or the load current feedback signal. The output voltage feedback signal may be understood as a signal that feeds back the voltage of the driving voltage signal. The load current feedback signal may be understood as a signal that feeds back the current flowing through the light source 330. The output voltage feedback signal and the load current feedback signal may both be voltage signals. The voltage signal is a signal that reflects a change in a certain physical quantity by a change in voltage. That is, different voltage values of the output voltage feedback signal correspond to different voltage values of the driving voltage signal, and different voltage values of the load current feedback signal correspond to different current values flowing through the light source 330.

To derive the output feedback signal, the system 300 may include a voltage feedback module. The output end of the voltage feedback module is connected with the feedback end of the light source driving module 311. The voltage feedback module is used for transmitting the output feedback signal to the feedback end of the light source driving module 311. The input end of the voltage feedback module may be connected to the output end of the light source driving module 311, for receiving the driving voltage signal. The voltage feedback module is used for generating an output feedback signal according to the driving voltage signal.

The voltage feedback module may include a first feedback resistor, one end of the first feedback resistor is an input end of the voltage feedback module, and the other end is an output end of the voltage feedback module. That is, the output feedback signal may be a driving voltage signal.

The voltage feedback module may also include a first voltage divider circuit and/or a second voltage divider circuit. The first voltage dividing circuit comprises a first voltage dividing resistor and a first voltage stabilizing capacitor which are connected in parallel, the input end of the first voltage dividing resistor receives a driving voltage signal, the second voltage dividing circuit comprises a second voltage dividing resistor, and one end of the second voltage dividing circuit is connected with the ground end.

The ground terminal is used to provide a ground potential, i.e. the connection to ground terminal is also understood to be connected to ground potential.

The voltage feedback module may include only the first voltage dividing circuit. That is, one end of the first voltage dividing circuit is an input end of the voltage feedback module, and the other end is an output end of the voltage feedback module.

In the case that the voltage feedback module includes the second voltage dividing circuit, the other end of the second voltage dividing circuit may be connected to one section of the first feedback resistor, and the other end of the first feedback resistor may be used to receive the driving voltage signal. The voltage feedback module may include a first feedback resistor.

When the voltage feedback module comprises a first voltage dividing circuit and a second voltage dividing circuit, the first voltage dividing circuit and the second voltage dividing circuit are connected in series, a node between the first voltage dividing circuit and the second voltage dividing circuit is connected with the feedback end, and the voltage feedback module transmits the voltage signal obtained by dividing the driving voltage signal to the feedback end as the output feedback signal.

The node between the first voltage dividing circuit and the second voltage dividing circuit, i.e. the node connecting the first voltage dividing circuit and the second voltage dividing circuit, may also be referred to as a voltage dividing node.

The first voltage dividing circuit and the second voltage dividing circuit are connected in series, namely the first voltage dividing circuit and the second voltage dividing circuit divide the driving voltage signal, and the signals of the nodes connected with the first voltage dividing circuit and the second voltage dividing circuit are the voltage dividing result of the driving voltage signal by the voltage feedback module.

The first voltage stabilizing capacitor circuit is arranged in parallel with the first voltage dividing resistor, so that the change of the output feedback signal is stable, no jump occurs, the change trend of the driving voltage signal is stable when the gear is changed, namely the brightness change of the light source 330 is stable, and the jump of the light-emitting brightness of the light source 330 is avoided.

The second voltage dividing circuit may further include a second voltage stabilizing capacitor connected in parallel with the second voltage dividing resistor. The voltage values at two ends of the second voltage-dividing resistor are stable due to the arrangement of the second voltage-stabilizing capacitor.

In the case where the second voltage dividing circuit includes the second voltage stabilizing capacitor, the circuit structure of the voltage feedback module may be referred to as the voltage feedback module 420 in fig. 4. The first voltage dividing resistor may be a resistor R in the voltage feedback module 420 ₃₁ The second voltage dividing resistor may be in the voltage feedback module 420Resistance R of (2) ₃₂ The first voltage stabilizing capacitor may be a capacitor C in the voltage feedback module 420 ₃₁ The second voltage stabilizing capacitor may be the capacitor C of the voltage feedback module 420 ₃₂ 。

The system 300 may also include a detection module. The detection module may be connected in series with the light source 330 between the output terminal of the light source driving module 311 and the ground terminal. Thus, the current flowing through the light source 330 is equal to the current flowing through the detection module.

The dimming module 312 is further configured to adjust the dimming voltage signal according to the current flowing through the detection module.

The dimming module 312 is configured to adjust the dimming voltage signal according to the current flowing through the detection module. For example, a signal adjustment module may be disposed in the dimming module 312, and the signal adjustment module is configured to adjust the dimming voltage signal according to the current flowing through the detection module. The signal adjustment module can be located in the singlechip. For example, the signal adjustment module may adjust the dimming reference signal according to the current flowing through the detection module, for example, adjust a duty cycle of the dimming reference signal if the dimming reference signal is a PWM wave.

The current flowing through the light source 330 is positively correlated with the light emission luminance of the light source 330. By detecting the current flowing through the detection module, the current flowing through the light source 330 is determined, thereby determining whether the light-emitting brightness of the light source 330 meets the demand. Different brightness gears may correspond to different gear currents. The corresponding gear current of the brightness gear represents the brightness requirement of the brightness gear.

The detection module may have a resistor disposed therein. By detecting the voltage across the resistor, the current through the resistor, and thus the light source 330, can be determined.

The detection module may comprise, for example, a first detection branch and a second detection branch connected in parallel.

The first detection branch circuit comprises a first detection resistor, and two ends of the first detection resistor are respectively connected with the input end and the output end of the first detection branch circuit.

The second detection branch circuit comprises a second detection resistor and a switching element which are connected in series between the input end and the output end of the second detection branch circuit, and the resistance value of the second detection resistor is smaller than that of the first detection resistor.

The dimming module 312 is configured to control the switching element in the second detection branch to be turned on, and determine a current flowing through the detection module according to a second voltage across the second detection resistor; and under the condition that the second voltage is smaller than the preset voltage, controlling the switching element in the second detection branch to be turned off, and determining the current flowing through the detection module according to the first voltage of the first detection resistor.

The detection module may be the detection module 440 shown in fig. 4.

In the case where the voltage value of the driving voltage signal is large, the current flowing through the light source 330 is large. The dimming module 312 controls the switching device in the second detection branch to be turned on, and the current flowing through the light source 330 mainly flows through the second detection resistor with a smaller resistance in the detection module, so that less power consumption is generated in the detection module to reduce the energy loss of the system 300.

In the case that the voltage value of the driving voltage signal is smaller, the current flowing through the light source 330 is smaller, the voltage generated by the current flowing through the second detection resistor at both ends of the second detection resistor is smaller, and the detection accuracy of the current flowing through the light source 330 determined according to the voltage at both ends of the second detection resistor is lower.

Under the condition that the second voltage at two ends of the second detection resistor is smaller than the preset voltage, the dimming module 312 controls the switching device in the detection module to be turned off, so that the current flowing through the light source 330 flows through all the first detection resistors with larger resistance values in the detection module. In the case that the current flowing through the light source 330 flows through the first detection resistor in its entirety, a larger voltage is generated across the first detection resistor, and the current flowing through the light source 330 is determined according to the first voltage across the first detection resistor, so that the detection accuracy of the current flowing through the light source 330 is improved.

In the case where the system 300 includes a detection module, the output feedback signal may also be determined based on the voltage value across the detection module. In the case where one end of the detection module is connected to the ground and the other end is connected to the light source 330, the voltage across the detection module is the voltage between the nodes between the detection module and the light source. The voltage across the detection module is positively correlated with the current flowing through the light source 330. That is, the detection module may represent the current flowing through the light source 330 as a voltage signal, forming a load current feedback signal. The feedback signal may also be determined from the load current feedback signal. See in particular the description of fig. 6 and 7.

In some embodiments, the voltage feedback module and the light source 330 may also be connected in parallel. The parallel circuit formed by the voltage feedback module and the light source 330 may be connected in series with the detection module. The resistance values of the first voltage dividing resistor and the second voltage dividing resistor in the voltage feedback module are far larger than the resistance value of the detection module. Illustratively, the other end of the second voltage divider resistor is connected to the first voltage divider resistor, and the one end of the second voltage divider resistor may also be connected to a node flowing between the light source 330 and the detection module.

The voltage value of the voltage dividing node in the voltage feedback module is influenced by the voltage value of the driving voltage signal on one hand and the current flowing through the detection module on the other hand. Since the resistance values of the first voltage dividing resistor and the second voltage dividing resistor in the voltage feedback module are far greater than the resistance value of the detection module, the current flowing through the detection module is approximately equal to the current flowing through the light source 330. Thus, the output feedback signal generated at the voltage dividing node in the voltage feedback module can be understood as a superposition of the output voltage feedback signal and the load current feedback signal.

In the case where the second voltage dividing circuit includes the second voltage stabilizing capacitor, and the parallel circuit formed by connecting the voltage feedback module in parallel with the light source 330 is connected in series with the detection module, the circuit structure of the voltage feedback module and the connection relationship with the light source 330 and the detection module can be seen in fig. 4.

The driving device 310 may further include a transceiver module for receiving the brightness level information. The dimming module 312 may output a dimming voltage signal corresponding to a brightness level indicated by the brightness level information received by the transceiver module. The transceiver module can receive the brightness level information in a wired or wireless mode.

The driving means 310 may be connected to the switching means, or the switching means may be provided in the driving means 310. The switching device may generate and transmit the brightness shift information according to an operation for setting the brightness shift by a user's key, touch, slide, or the like. Thus, the transceiver module in the driving apparatus 310 may receive the brightness level information through a wired manner. In the case where the driving device 310 may be connected to a switching device, the switching device may be a switch panel, a pull switch, or the like.

The transceiver module can also receive brightness gear information sent by the remote control device. The brightness shift information is generated by the remote control device according to the user operation. The remote control transmits the brightness level information to the driving device 310 by wireless means.

The transceiver may also receive switch indication information. When the switch indication information indicates the on state, the light source driving module 311 and the dimming module 312 in the driving device 310 are in the operating state, and the power supply 330 is in the on state. In the case that the on-state indication information indicates the off state, the light source driving module 311 and the dimming module 312 are in a rest state, and no longer operate, and the power supply 330 is in an off state. The transceiver module can receive the switch indication information in a wired or wireless mode.

The light sources 330 in the system 300 may be used for daily lighting, information indication, and the like. The circuit structure of the various components in the system 300 may be seen in the description of fig. 4 and 6. It should be understood that the voltage conversion performed by the light source driving module 311 on the dc voltage signal may be boosting or reducing. Fig. 4 and 6 illustrate an example of voltage conversion to voltage reduction.

Fig. 4 is a schematic block diagram of a light source brightness adjustment system according to an embodiment of the present application.

The system 300 includes a chip 410, an input capacitor C _IN3 Output capacitance C _OUT3 Conversion capacitor C ₃₃ Inductance L ₃₁ A voltage feedback module 420, a filter circuit 430, a detection module 440, a light source 330.

The chip 410 is provided with pins such as FB pin, EN pin, IN pin, SW pin, BS pin, and GND pin.

GND pin of chip 410 is connected to groundAnd (3) a potential. DC input voltage V _IN To the IN pin. Input capacitance C _IN3 Is connected to the IN pin at one end and to ground at the other end. Input capacitance C _IN3 For input voltage V _IN The voltage value of the input IN pin is more stable.

Conversion capacitor C ₃₃ Is connected to the BS pin and the SW pin of the chip 410, respectively. Inductance L ₃₁ Is connected to the SW pin and the output of system 300, node O3, respectively.

Enable voltage V _EN To the EN pin of chip 410. At the enable voltage V _EN In the case of high level, the switching device and capacitor C in the chip 410 ₁₁ Inductance L ₁₁ Voltage conversion circuit formed by the devices to realize direct current input voltage V _IN3 To obtain a driving voltage signal of the O3 node, the voltage of the driving voltage signal being the output voltage V _OUT3 . Enable voltage V _EN Can be understood as a switching signal. Enable voltage V _EN At a high level, the voltage value is stable. High level of enable voltage V _EN Voltage value of (2) and input voltage V _IN The voltage values of (2) may be the same or different.

The detection module 440 is connected in series with the light source 330 as a load.

As shown in fig. 4, the detection module 440 includes a first detection leg and a second detection leg connected in parallel. The first detection branch comprises a first detection resistor R ₃₃ . The second detection branch comprises a switching device Q and a second detection resistor R which are connected in series ₃₄ . Second detection resistor R ₃₄ The resistance value of (a) is far smaller than that of the first detection resistor R ₃₃ Is a resistance value of (a). Illustratively, a second sense resistor R ₃₄ The resistance value of (a) may be 0.1 ohm (Ω), the first sense resistor R ₃₃ The resistance of (2) may be 20Ω.

Output voltage V at O3 node _OUT3 In larger cases, the current flowing through the light source 330 is larger. The switching device Q is turned on, and the current flowing through the light source 330 mainly flows through the second detection resistor R with smaller resistance value in the detection module 440 ₃₄ The second detection branch is locatedThe power consumption generated in the detection module 440 is small.

While the output voltage V at the O3 node _OUT3 Smaller, the current flowing through the light source 330 is smaller, according to the second detection resistor R ₃₄ The accuracy of the voltage across the terminals determines the current through the detection module 440 is low.

In this case, the switching device Q may be controlled to be turned off so that the current flowing through the light source 330 entirely flows through the second detection resistor R in the detection module 440 ₃₄ Thereby creating a large voltage drop across the detection module 440 facilitating detection of the current flowing through the light source 330. Device control voltage V _Q For controlling the switching device Q on and off.

As shown in fig. 6, the detection module 440 may also include only the third detection resistor R ₃₅ 。

The current detection method using the resistor may be to detect the voltage value across the resistor and determine the current flowing through the resistor according to the resistance value of the resistor.

Compared with the circuit structure of the detection module 440 in fig. 6, the arrangement of the first detection branch and the second detection branch in parallel as shown in fig. 4 in the detection module 440 can realize accurate current detection under the condition of lower system power consumption.

First detection resistor R in detection module 440 ₃₃ Resistance value of (2), second detection resistor R ₃₄ The resistance values of (a) are smaller than the first voltage dividing resistor R in the voltage feedback module 420 ₃₁ And is smaller than the second voltage dividing resistor R ₃₂ Is a resistance value of (a). In order to reduce power consumption, a first voltage dividing resistor R ₃₁ Second voltage-dividing resistor R ₃₂ Can have a resistance value far greater than that of the first detection resistor R ₃₃ Is a resistance value of (a). Illustratively, a first voltage dividing resistor R ₃₁ The resistance of (a) may be 100 kilo-ohms (kΩ), a second voltage dividing resistor R ₃₂ Can be realized by two resistors of 10k omega and 27k omega in parallel.

The voltage feedback module 420 includes a first voltage dividing circuit and a second voltage dividing circuit connected in series. The first voltage dividing circuit comprises a first voltage dividing resistor R connected in parallel ₃₁ And a first voltage stabilizing capacitor C ₃₁ The second voltage dividing circuit comprises a second voltage dividing resistor R connected in parallel ₃₂ And a second voltage stabilizing capacitor C ₃₂ 。

The node between the first voltage dividing circuit and the second voltage dividing circuit may be referred to as a voltage dividing node, and the voltage dividing node is connected to the FB pin of the chip 410.

One end of the first voltage dividing circuit is connected to the node O3, and the other end of the first voltage dividing circuit is connected to one end of the second voltage dividing circuit.

The other end of the second voltage dividing circuit may be connected to the ground potential. In this case, the voltage of the node between the first voltage dividing circuit and the second voltage dividing circuit can be understood as the output voltage feedback signal.

Alternatively, at the first voltage dividing resistor R ₃₁ Second voltage-dividing resistor R ₃₂ The resistance value of (2) is far greater than that of the first detection resistor R ₃₃ In the case of the resistance value of (2), the voltage feedback module 420 may be connected in parallel with the light source 330 as shown in fig. 4. That is, the other end of the second voltage dividing circuit may be connected to the light source 330 and the detection module 440. A first voltage dividing resistor R ₃₁ Second voltage-dividing resistor R ₃₂ The resistance value of (2) is far greater than that of the first detection resistor R ₃₃ The resistance of the detection module is very small relative to the resistance of the voltage feedback module 420, and the other end of the second voltage dividing circuit corresponds to the connection ground potential.

In the voltage feedback module 420, the other end of the second voltage dividing circuit may be connected to the ground potential.

The current flowing through the light source 330 has an effect on the voltage of the node between the first voltage dividing circuit and the second voltage dividing circuit, in which case the voltage of the node between the first voltage dividing circuit and the second voltage dividing circuit may be understood to be determined from the output voltage feedback signal and the current feedback signal. The output voltage feedback signal and the current feedback signal enable superposition of the signals at a node between the first voltage divider circuit and the second voltage divider circuit.

The filter circuit 430 may employ an RC filter circuit, such as a first-order RC filter circuit, or a second-order RC filter circuit. The filter circuit 430 is described by taking a second-order RC filter circuit as an example.

The filter circuit 430 may include a first filterWave resistance R ₃₅ A second filter resistor R ₃₆ First filter capacitor C ₃₅ A second filter capacitor C ₃₆ . First filter resistor R ₃₅ The first end of the filter circuit 430 is an input end, and the second end is connected with the second filter resistor R ₃₆ Is provided. Second filter resistor R ₃₆ The second terminal of (a) is the output terminal of the filter circuit 430. First filter capacitor C ₃₅ Two ends of (a) are respectively connected with a first filter resistor R ₃₅ And ground potential. Second filter capacitor C ₃₆ Two ends of (a) are respectively connected with a second filter resistor R ₃₆ And ground potential. The output end of the filter circuit 430 is the second filter resistor R ₃₆ Is connected to the FB pin of chip 410. The input end of the filter circuit 430 is a first filter resistor R ₃₅ May receive a PWM signal.

Input voltage V _IN3 Enable voltage V _EN Device control voltage V _Q The PWM signals may be generated by the same or different devices. Illustratively, the SCM may generate an input voltage V _IN3 Enable voltage V _EN Device control voltage V _Q PWM signals, etc. Alternatively, the singlechip may generate the enable voltage V _EN Device control voltage V _Q PWM signal, input voltage V _IN3 May be provided by a dc voltage source. The electric signal output by the direct-current voltage source can be used for supplying power to the singlechip through voltage conversion.

As shown in fig. 5, after the PWM signal is filtered by the filter circuit 430, the filtered signal is a stable voltage signal. The filtered signal is applied to the FB pin of chip 410. The FB pin is used for receiving an output feedback signal according to the output voltage V of the node O3 _OUT3 And (3) determining. The FB pin can be connected to the first voltage dividing resistor R in the voltage feedback module 420 ₃₁ And a second voltage-dividing resistor R ₃₂ The output feedback signal may be a superposition of the output voltage feedback signal and the output current feedback signal. The filtered signal applied to the FB pin of the chip 410 adjusts the output feedback signal, and the voltage received by the FB pin is obtained by applying the filtered signal to the output feedback signalTo the voltage value. The signal received at FB pin can be understood as the superposition of the signal filtered by filter circuit 430 on the output feedback signal.

In the system 300 shown in FIG. 4, the signal received at the FB pin is changed by the PWM signal, thereby changing the output voltage V at the node O3, as compared with the case where the FB pin of the chip 110 shown in FIG. 1 receives the output feedback signal of the output voltage _OUT3 . When the duty ratio of the PWM signal changes, the voltage value of the signal filtered by the filter circuit 430 changes, resulting in an output voltage V _OUT3 Is a change in (c).

The voltage applied across the light source 330 determines the maximum current flowing through the light source 330, and the brightness of the light source 330 is positively correlated with the current of the light source 330. Thus, adjusting the duty cycle of the PWM signal can cause the output voltage V _OUT3 The current flowing through the light source is changed to be different, so that the purpose of adjusting the brightness of the light source 330 is achieved.

Unlike the approach shown in fig. 2, the system 300 described in fig. 4 uses PWM technology, but the filtered PWM signal acts on the FB pin (i.e., the feedback terminal) of the chip 410, and not on the EN pin (i.e., the enable terminal). Thus, the system 300 shown in FIG. 4 is implemented by adjusting the external feedback such that the switching devices and the capacitance C in the chip 410 ₁₁ Inductance L ₁₁ Output voltage V obtained at node O3 by voltage conversion circuit formed by the same device _OUT3 A change occurs. The system 300 adjusts the brightness of the light source 330 by adjusting the voltage value applied across the light source 330 using the light emitting characteristics of the LEDs in the light source 330, thereby achieving brightness adjustment of the light source 330. Receiving high level signal at EN pin, voltage conversion circuit continuously performs voltage conversion to input voltage V _IN1 Converting DC voltage, i.e. voltage is output voltage V _OUT1 Continuously outputting the driving voltage signal to continuously drive the light source 330, so that the light source 330 is continuously in a light-emitting state, and the stroboscopic effect of the light source 330 is avoided.

As shown in fig. 4, in the case that a load parallel circuit including the voltage feedback module 420 and the light source 330 connected in parallel is connected in series with the detection module 440, the current flows through the detection module 440The current has a certain effect on the output feedback signal received by the FB pin. That is, the voltage value at the FB pin is the output voltage V according to the driving voltage signal _OUT3 The voltage value of the dimming voltage signal output by the dimming module 312, and the current flowing through the detection module 440.

Due to the first voltage dividing resistor R in the voltage feedback module 420 ₃₁ And a second voltage dividing resistor R ₃₂ In the load parallel circuit, the current mainly flows through the light source 330. The current flowing through the detection module 440 is substantially equal to the current flowing through the light source 330.

Therefore, the current flowing through the light source 330 has a certain influence on the voltage value at the FB pin, thereby influencing the voltage conversion of the voltage conversion circuit and the output voltage V _OUT3 。

The current flowing through the light source 330 is an output voltage V according to the driving voltage signal _OUT3 And (3) determining. However, at the output voltage V of the driving voltage signal _OUT3 In the same case, there may be some deviation in the current flowing through the light source 330 at different time points due to the temperature and the aging of the components in the light source 330. The signal capable of reflecting the current flowing through the light source 330 is fed back to the FB pin, so that the driving voltage signal more accords with the brightness of the light source 330 corresponding to the current brightness gear.

The chip 410 has a wider selection range, so that a common DC/DC conversion chip can adapt to the requirements of the system 300, and the system 300 has stronger compatibility.

The variety of DC/DC conversion chips is large, so that the system 300 can be applied to a wider input voltage range, and the limitation of the input voltage is widened.

The DC/DC conversion chip is used as a part of the voltage conversion circuit, so that the voltage conversion circuit has higher conversion efficiency due to the general DC/DC conversion chip, and the system 300 has smaller electric energy loss and higher voltage conversion efficiency in the voltage conversion process.

In the system 300, the circuit connected to the periphery of the chip 410 is simple, the singlechip outputs a PWM signal, and the signal obtained by filtering through the filtering circuit 430 acts on the feedback end of the chip 410 to realize brightness adjustment of the light source 330. The filter circuit 430 adopts an RC filter circuit, and has the advantages of fewer used devices and low device cost, so that the cost of the system 300 is lower.

The duty ratio of the PWM signal is adjusted in the range of 0% to 100% more simply and flexibly, so that the voltage of the signal obtained by filtering is varied, and the adjustment of the voltage is simple, thereby adjusting the brightness of the light source 330 more freely.

The singlechip may be configured to determine the first detection resistor R in the detection module 440 ₃₃ Or a second sense resistor R ₃₄ The voltage at the two ends determines the current flowing through the detection module 440, and adjusts the duty ratio of the PWM signal according to the current flowing through the detection module 440430, so that the current flowing through the light source 330 is more accurate, and the brightness of the light source 330 meets the requirements.

The detection module 440430 can also be understood as a limiting resistor circuit, so as to avoid damage caused by excessive current flowing through the light source 330.

In the filter circuit 430, a first filter resistor R ₃₅ A second filter resistor R ₃₆ The resistance of (2) plays an important role in the influence of the PWM signal on the FB pin. By adjusting the first filter resistor R ₃₅ A second filter resistor R ₃₆ Can adjust the voltage of the signal obtained by filtering by the filter circuit 430, thereby influencing the output voltage V _OUT3 The magnitude of the voltage value variation range during the duty cycle adjustment of the PWM signal.

Thereby, the first filter resistor R is adjusted ₃₅ A second filter resistor R ₃₆ Can change the output voltage V under the condition of the same change amount of the duty ratio of the PWM signal _OUT3 Is a variable amount of (a). That is, the first filter resistor R ₃₅ A second filter resistor R ₃₆ The resistance of (2) influences the duty ratio of the PWM signal to the output voltage V _OUT3 The accuracy of the adjustment is performed.

During the production design of system 300, the output voltage V may be based on _OUT3 The first filter resistor R is reasonably arranged according to the voltage value change range requirement of the voltage value ₃₅ A second filter resistor R ₃₆ Is a resistance value of (a).

In the voltage feedback module 420, the first voltage dividing resistor R ₃₁ First voltage stabilizing capacitor C connected in parallel ₃₁ The voltage of the node O3 can be prevented from jumping, so that the voltage feedback module 420 received by the FB pin is prevented from outputting the voltage V to the node OUT3 _OUT3 The voltage of the divided result of (a) is jumped. When the brightness of the LED component needs to be changed, the duty ratio of the PWM signal suddenly changes, so that the voltage value of the filtered signal rapidly changes. Due to the first stabilizing capacitor C ₃₁ The voltage feedback module 420 outputs the voltage V _OUT3 After the voltage value of the filtered signal changes, the voltage feedback module 420 outputs the voltage V _OUT3 The voltage value of the voltage division result of (2) does not jump but changes smoothly, so as to avoid abrupt change of the voltage at the FB pin and output the voltage V when the duty ratio of the PWM signal changes abruptly _OUT3 And thus avoids a jump in the brightness of the light source 330, and avoids a jump phenomenon. Therefore, the first voltage stabilizing capacitor C ₃₁ The capacitance of (2) determines the output voltage V _OUT3 Response speed to duty cycle variation of PWM signals.

In some embodiments, the detection module 440 may be configured to provide an output feedback signal. The output feedback signal may be the voltage across the detection module 440. That is, the output feedback signal may be a load current feedback signal.

The voltage across the detection module 440 is proportional to the current flowing through the detection module 440, and the current flowing through the detection module 440 is nearly equal to the current flowing through the light source 330. According to the on-characteristics of the LEDs in the light source 330, the current flowing through the light source 330 is positively correlated with the voltage across the light source 330, i.e., with the output voltage V _OUT3 Positive correlation. Therefore, the voltage across the detection module 440 is the output voltage V according to the driving voltage signal _OUT3 And (3) determining. That is, in the circuit configuration of the system 300 shown in fig. 6, the output feedback signal is also derived from the driving voltage signal.

As shown in fig. 6, the detection module 440 may include a third detection resistor R connected between the ground and the light source 330 ₃₈ 。

In order to reduce the power consumption of the system 300, a third sense resistor R ₃₈ The resistance of (2) is small. The detection module 440 comprises a third detection resistor R ₃₈ In order to reduce the influence of the resistance in the filter circuit 430 on the voltage across the detection module 440, a second feedback resistor R may be provided between the FB pin and the node between the detection module 440 and the light source 330 ₃₇ 。

As shown in fig. 7, after the PWM signal is filtered by the filter circuit 430, the filtered signal is a stable voltage signal. The filtered signal is applied to the FB pin of chip 410. The FB pin is used for receiving an output feedback signal according to the second feedback resistor R ₃₇ The voltage across the terminals is determined, i.e. the feedback signal may be a load current feedback signal. Second feedback resistor R ₃₇ Voltage across and through the second feedback resistor R ₃₇ Is proportional to the current flowing through the second feedback resistor R ₃₇ Is equal to the current flowing through the light source 330. The voltage applied across the light source 330 determines the maximum current flowing through the light source 330, and the voltage across the light source 330 and the output voltage V of the node O3 _OUT3 Positive correlation. Thus, the second feedback resistor R ₃₇ The voltage at both ends and the output voltage V of the node O3 _OUT3 Positive correlation, the output feedback signal is based on the output voltage V of node O3 _OUT3 And (3) determining.

The filtered signal applied to the FB pin in the chip 410 adjusts the output feedback signal, and the voltage received by the FB pin is the voltage value obtained by applying the filtered signal to the output feedback signal. Illustratively, the signal received at the FB pin may be a superposition of the signal filtered by the filter circuit 430 on the output feedback signal.

The light source luminance shift described in the present embodiment is at least two, for example: the brightness is switched from 1 st brightness to 2 nd brightness, and the 2 nd brightness is greater than the 1 st brightness. It can be understood that the system can be also suitable for a scene without gear mode switching, so that when the adjustment requirement is met for the brightness gear of the light source, the capacity expansion or the upgrading of the multi-gear switching function can be realized through the programming of the singlechip, the production of hardware equipment for a new function is not needed, the resource availability is further improved, and the cost is reduced.

The light sources 330 in the system 300 may be used for daily lighting, information indication, and the like. In some embodiments, the system 300 may also not include a light source, but may be connected to the light source 330, so as to implement driving of the light source 330. Illustratively, the light source 330 may be disposed in the luminaire lighting.

The embodiment of the application also provides a lamp switch. The light switch may include: the switch shell is internally provided with a light source driving module and a dimming module.

When the control operation of the switch shell triggers the light source driving module and the dimming module to be in a working state, the light source is in a lighting state.

The control operation of the switch housing may be an operation of a physical switch key on the switch housing by a user, or an operation of transmitting control information to the switch housing by a user through a terminal or other devices in a wireless manner.

And under the condition that the light source driving module and the dimming module are in a working state, the dimming module transmits a generated dimming voltage signal to a feedback end of the light source driving module, and the dimming voltage signal has a voltage value matched with a preset light source brightness gear mode.

When the control operation of the switch shell triggers the light source driving module and the dimming module to be in a working state, the control operation of the switch shell can also indicate the brightness gear. The preset light source brightness shift pattern may include a plurality of brightness shifts, and the brightness shift indicated for the control operation of the switch housing may be a certain brightness shift among the plurality of brightness shifts.

The feedback end is used for receiving an output feedback signal, and the output feedback signal is a voltage signal determined according to a driving voltage signal output by the output end of the light source driving module.

The light source driving module performs voltage conversion on the direct current voltage signal received by the power input end according to the dimming voltage signal and the output feedback signal to obtain a driving voltage signal for adjusting the brightness of the light source.

The light source driving module can perform voltage conversion on the direct-current voltage signal according to the voltage signal received by the feedback end, the dimming voltage signal and the output feedback signal are both transmitted to the feedback end, and the voltage conversion can be performed according to the dimming voltage signal and the output feedback signal. Therefore, the dimming voltage signal may affect the voltage value of the converted driving voltage signal, that is, the voltage value of the driving voltage signal output by the light source driving module is matched with the brightness gear indicated by the control operation of the switch housing, that is, the driving voltage signal is matched with the light source brightness gear mode. And the driving voltage signal is used to determine the light source, so that the brightness of the light source can be adjusted by adjusting the dimming voltage signal.

The light source driving module continuously outputs driving voltage signals matched with the light source brightness gear mode under the state of light source brightness gear mode and/or light source brightness gear mode switching.

When the control operation of the switch shell triggers the dimming module and the light source driving module to be in a rest state, the light source is in an extinction state.

The light source driving module may be a light source driving module 311 in the system 300 and the dimming module may be a dimming module 312 in the system 300.

The embodiment of the application also provides a light source brightness adjustment system 300, which comprises a light source and a driving device 310 of the light source.

The system 300 may be powered by a power storage device such as a battery, a solar powered terminal, or other dc voltage source.

The embodiment of the application also provides a solar power supply system, which comprises a solar power supply end and a driving device of a light source, wherein the energy of the dimming voltage signal and the direct current voltage signal is derived from the solar power supply end.

As shown in fig. 9, a photovoltaic panel 910 may be provided on the house, and the photovoltaic panel 910 is used to convert solar energy into electric energy. Illustratively, the photovoltaic panel 910 may be disposed on a roof or exterior wall of a house. The solar powered end includes a photovoltaic panel 910.

The house interior may be provided with a system 300. Wherein the driving device 310 may be disposed on a wall surface within the house, and the light source 330 may be disposed on a top, a wall surface, or other locations of the house. The energy of the dimming voltage signal and the direct voltage signal received by the driving device 310 may originate from the photovoltaic panel 910. The driving device 310 may receive the brightness level information through a wired or wireless manner.

In some embodiments, in the driving device 310, the energy of the dimming voltage signal and the direct current voltage signal may be derived from the electrical energy generated by the photovoltaic panel 910.

In other embodiments, after the photovoltaic panel 910 converts solar energy into electrical energy, the converted electrical energy may be stored in a storage device such as a battery. The energy of the dimming voltage signal and the direct-current voltage signal may be electric energy stored in the electric storage device.

The solar power supply system may further comprise an electrical storage device, wherein energy of the dimming voltage signal and the direct current voltage signal is derived from the electrical storage device, and energy in the electrical storage device is derived from the solar power supply terminal.

Fig. 8 is a schematic flowchart of a light source brightness adjustment method according to an embodiment of the present application. The light source brightness adjustment method may be performed by the light source driving module 311 in the driving apparatus 310. The method includes S801 to S802.

In S801, a dimming voltage signal generated by the dimming module is obtained through a feedback end, where the dimming voltage signal has a voltage value matched with a light source brightness gear mode, and the feedback end is configured to receive an output feedback signal, where the output feedback signal is a voltage signal determined according to a driving voltage signal output by an output end of the light source driving module.

In S802, according to the dimming voltage signal and the output feedback signal, performing voltage conversion on the dc voltage signal received by the power input end to obtain the driving voltage signal for adjusting the brightness of the light source, where the light source driving module continuously outputs the driving voltage signal matched with the light source brightness shift mode in the state of switching the light source brightness shift mode and/or the light source brightness shift mode.

the signal generating device is used for generating a dimming reference signal;

the dimming module is further configured to set a target duty ratio corresponding to the current brightness gear to a duty ratio of the dimming reference signal according to a corresponding relationship between the brightness gear and the duty ratio.

Optionally, the output feedback signal is generated by a voltage feedback module according to the driving voltage signal, and the voltage feedback module includes: a first voltage dividing circuit and/or a second voltage dividing circuit; the first voltage dividing circuit includes: the driving circuit comprises a first voltage dividing resistor and a first voltage stabilizing capacitor which are connected in parallel, wherein the input end of the first voltage dividing resistor receives the driving voltage signal, the second voltage dividing circuit comprises a second voltage dividing resistor, and one end of the second voltage dividing circuit is connected with the ground end.

When the voltage feedback module comprises the first voltage dividing circuit and the second voltage dividing circuit, the first voltage dividing circuit and the second voltage dividing circuit are connected in series, a node connecting the first voltage dividing circuit and the second voltage dividing circuit is connected with the feedback end, and the voltage feedback module transmits the voltage signal obtained by dividing the driving voltage signal to the feedback end as the output feedback signal.

Optionally, the dimming voltage signal is determined by the dimming module according to a current flowing through a detection module, and the detection module and the light source are connected in series between an output terminal of the light source driving module and a ground terminal.

It should be noted that although in the above detailed description several modules or units for action execution are mentioned, this division is not mandatory. Indeed, the features and functions of two or more modules or units described above may be embodied in one module or unit, according to the detailed description of the present application. Conversely, the features and functions of one module or unit described above may be further divided into a plurality of modules or units to be embodied.

Furthermore, although the various steps of the methods herein are depicted in the accompanying drawings in a particular order, this is not required to either suggest that the steps must be performed in that particular order, or that all of the illustrated steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.

It should be noted that the embodiments of the present application may be implemented by hardware, software, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or special purpose design hardware. Those of ordinary skill in the art will appreciate that the apparatus and methods described above may be implemented using computer executable instructions and/or embodied in processor control code, such as provided on a carrier medium such as a magnetic disk, CD or DVD-ROM, a programmable memory such as read only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The devices and modules thereof of the present application may be implemented by hardware circuitry, such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., as well as software executed by various types of processors, or by a combination of the above hardware circuitry and software, such as firmware.

The foregoing is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited to this, and any modification, equivalent replacement and improvement made by those skilled in the art within the technical scope of the present application, which is within the spirit and principles of the present application, shall be covered by the protection scope of the present application.

Claims

1. A driving device for a light source, comprising: a light source driving module and a dimming module;

2. The apparatus of claim 1, wherein the dimming module comprises a first-order low-pass filter circuit or a second-order low-pass filter circuit, and a signal generating device;

3. The apparatus of claim 2, wherein the dimming reference signal is a PWM wave and the light source brightness shift pattern comprises at least two brightness shifts;

4. The apparatus as recited in claim 1, further comprising: the output end of the voltage feedback module is connected with the feedback end and is used for transmitting the output feedback signal to the feedback end; the input end of the voltage feedback module is connected with the output end of the light source driving module and is used for receiving the driving voltage signal, and the voltage feedback module is used for generating the output feedback signal according to the driving voltage signal.

5. The apparatus of claim 4, wherein the voltage feedback module comprises: a first voltage dividing circuit and/or a second voltage dividing circuit;

the first voltage dividing circuit includes: the input end of the first voltage dividing resistor receives the driving voltage signal;

the second voltage dividing circuit comprises a second voltage dividing resistor, and one end of the second voltage dividing circuit is connected with the ground end;

when the voltage feedback module comprises the first voltage dividing circuit and the second voltage dividing circuit, the first voltage dividing circuit and the second voltage dividing circuit are connected in series, a node connecting the first voltage dividing circuit and the second voltage dividing circuit is connected with the feedback end, and the voltage feedback module takes the divided voltage signal obtained by dividing the driving voltage signal as the output feedback signal and transmits the output feedback signal to the feedback end.

6. The apparatus as recited in claim 1, further comprising: the detection module and the light source are connected in series between the output end of the light source driving module and the ground end;

7. The apparatus of claim 6, wherein the detection module comprises: the first detection branch circuit and the second detection branch circuit are connected in parallel;

8. A light source brightness adjustment system, comprising: a light source and a driving device of the light source as claimed in any one of claims 1-7.

9. A method for adjusting brightness of a light source, comprising:

10. A solar power supply system, comprising: a solar powered end and a driving arrangement for a light source as claimed in any one of claims 1-7;

The energy of the dimming voltage signal and the direct current voltage signal is derived from the solar power supply end.