CN212435980U

CN212435980U - Dimming drive circuit and lighting device

Info

Publication number: CN212435980U
Application number: CN202022047402.0U
Authority: CN
Inventors: 周峰; 杨林; 杨海涛
Original assignee: Longhorn Lighting Co ltd
Current assignee: Longhorn Lighting Co ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-01-29
Anticipated expiration: 2030-09-17

Abstract

A dimming drive circuit and a lighting device are provided, the dimming drive circuit is connected with a switch power supply of a light source, the dimming drive circuit adopts a power switch circuit, a control circuit and a dimming circuit, wherein the control circuit outputs a corresponding first PWM signal according to a preset voltage signal provided by the power switch circuit to control the dimming circuit to regulate the output power of the switch power supply (namely the input power of the light source) to be target power, thereby realizing the isolation regulation of the input power of the light source, avoiding the arcing and arcing faults caused by direct hard switching of a switch resistor, thereby influencing the performance and reliability of the circuit, and solving the problem of poor reliability of the circuit of the traditional light source regulation circuit.

Description

Dimming drive circuit and lighting device

Technical Field

The application belongs to the technical field of adjust luminance, especially relates to a drive circuit and lighting device adjust luminance.

Background

At present, in a traditional light source regulating circuit, power regulation is generally performed by directly regulating a sampling resistor of a converter setting current through a mechanical switch, but when the circuit current is large, the hard switching mode is easy to strike sparks and draw an arc, so that the performance and reliability of the circuit are influenced.

Therefore, the conventional light source adjusting circuit has a problem of poor reliability of the circuit.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a dimming driving circuit and a lighting device, and aims to solve the problem that a traditional light source adjusting circuit is poor in reliability.

A first aspect of an embodiment of the present application provides a dimming driving circuit, connected to a switching power supply of a light source, the dimming driving circuit including:

the power switch circuit is used for selecting one of a plurality of preset voltage signals with different voltage values according to operation and outputting the selected voltage signal, and one preset voltage signal is matched with the output power of one switch power supply;

the control circuit is connected with the power switch circuit and used for outputting a corresponding first PWM (Pulse Width Modulation) signal according to the preset voltage signal output by the power switch circuit; and

and the dimming circuit is connected with the control circuit and is used for outputting a corresponding driving signal to the switching power supply under the control of the first PWM signal so as to regulate the output power.

In one embodiment, the power switching circuit includes: the first end of the first resistor is connected with a power supply, the second end of the first resistor and the first ends of the second resistors are connected to the control circuit in a common mode, the second end of each second resistor is grounded through the first multi-gear switch, and the first multi-gear switch is used for switching on one or more second resistors to output a preset voltage signal to the control circuit.

In one embodiment, the dimming driving circuit further includes a first interface, the first interface is configured to receive an adjustment signal and output the adjustment signal to the control circuit, and the adjustment signal is configured to adjust a matching relationship between the preset voltage signal and the output power.

In one embodiment, the dimming driving circuit further comprises a proportional regulating circuit connected to the control circuit, the proportional regulating circuit being configured to provide a proportional regulating signal to the control circuit, and the control circuit being configured to proportionally regulate the duty cycle of the first PWM signal to a target value according to the proportional regulating signal.

In one embodiment, the scaling circuit includes:

a fixed regulation circuit for outputting the proportional regulation signal within a target voltage range;

the filter circuit is connected with the fixed regulating circuit and the control circuit and is used for filtering clutter interference of the proportion regulating signal; and

the switching circuit is connected with the output end of the fixed regulating circuit and is used for accessing an external voltage signal to increase the voltage value of the proportional regulating signal or disconnecting an input path of the external voltage signal; the voltage value of the proportional control signal is matched with the proportion.

In one embodiment, the fixed regulation circuit includes a dimmer for outputting the proportional regulation signal according to a regulation command.

In one embodiment, the fixed regulation circuit comprises a photosensitive sensor for acquiring ambient brightness and outputting the proportional regulation signal according to the ambient brightness.

In one embodiment, the dimming driving circuit further includes: the isolation circuit is connected between the control circuit and the dimming circuit in series and is used for isolating and outputting the first PWM signal to the dimming circuit.

In one embodiment, the light source comprises a plurality of LED strings with different color temperatures, and the dimming driving circuit further comprises a color temperature adjusting circuit, wherein the color temperature adjusting circuit is used for switching on at least one of the LED strings to make the color temperature of the light source be the target color temperature.

A second aspect of the embodiments of the present application provides a lighting device, including a light source and the dimming driving circuit according to the first aspect of the embodiments of the present application, wherein the light source is connected to the dimming driving circuit.

The dimming driving circuit is connected with a switching power supply of a light source, and adopts a power switching circuit, a control circuit and a dimming circuit, wherein the control circuit outputs a corresponding first PWM signal according to a preset voltage signal provided by the power switching circuit to control the dimming circuit to regulate the output power of the switching power supply (namely the input power of the light source) to be target power, so that the isolation regulation of the input power of the light source is realized, the arcing and arc discharge faults caused by direct hard switching of a switch resistor are avoided, the performance and the reliability of the circuit are influenced, and the problem of poor reliability of the circuit in the conventional light source regulating circuit is solved.

Drawings

Fig. 1 is a circuit diagram of a dimming driving circuit according to an embodiment of the present application;

fig. 2 is an exemplary circuit schematic of a power switching circuit of the dimming driving circuit shown in fig. 1;

fig. 3 is another circuit diagram of the dimming driving circuit shown in fig. 1;

fig. 4 is another circuit diagram of the dimming driving circuit shown in fig. 1;

fig. 5 is a circuit diagram of a proportional regulating circuit of the dimming driving circuit shown in fig. 4;

fig. 6 is another circuit diagram of the dimming driving circuit shown in fig. 1;

fig. 7 is an exemplary circuit schematic of an isolation circuit of the dimming driving circuit shown in fig. 6;

fig. 8 is another circuit diagram of the dimming driving circuit shown in fig. 1;

fig. 9 is a schematic circuit diagram of an example of the color temperature adjusting circuit of the dimming driving circuit shown in fig. 8.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Fig. 1 shows a schematic structural diagram of a dimming driving circuit 10 provided in a first aspect of an embodiment of the present application, and for convenience of description, only a part related to the embodiment is shown, and the detailed description is as follows:

the dimming driving circuit 10 in the present embodiment and the switching power supply 20 of the light source 30, the dimming driving circuit 10 includes: the dimming circuit comprises a power switch circuit 100, a control circuit 200 and a dimming circuit 300, wherein the output end of the power switch circuit 100 is connected with the first input end of the control circuit 200, and the output end of the control circuit 200 is connected with the dimming circuit 300; a power switching circuit 100 for selecting one of a plurality of preset voltage signals operating at different voltage values to be output, one preset voltage signal matching one output power of the switching power supply 20; the control circuit 200 is configured to output a corresponding first PWM signal according to a preset voltage signal; and a dimming circuit 300 for outputting a corresponding driving signal to the switching power supply 20 under the control of the first PWM signal to adjust the output power.

It should be understood that the output terminal of the switching power supply 20 is connected to the light source 30, and the output power of the switching power supply 20 is the input power of the light source 30.

It should be understood that the power switching circuit 100 includes a switch and a plurality of resistors of different resistances; the control circuit 200 may be constituted by a microprocessor such as a single chip microcomputer; the dimming circuit 300 may be constituted by a dimming constant current driving chip. The light source 30 may be a string of one or more LED lights, or an array of LEDs, etc. The switching power supply 20 may be a DC/DC constant voltage conversion circuit.

It should be understood that one preset voltage signal matches the output power of one switching power supply 20, i.e., one preset voltage signal represents one power regulation parameter, and one power regulation parameter corresponds to one first PWM signal. For example, a preset voltage signal of 5V matches the output power of 20W, that is, when the preset voltage signal output by the power switching circuit 100 is 5V, the control circuit 200 outputs a corresponding PWM signal to control the dimming circuit 300 to adjust the output power of the switching power supply to 20W. The drive signal is also a pulse width modulated signal.

The dimming driving circuit 10 in this embodiment adopts the power switch circuit 100, the control circuit 200 and the dimming circuit 300, and the control circuit 200 outputs the corresponding first PWM signal according to the preset voltage signal provided by the power switch circuit 100 to control the dimming circuit 300 to adjust the output power of the switching power supply 20, that is, the input power of the light source 30 to the target power, thereby implementing the isolation adjustment of the input power of the light source 30, avoiding the arcing and arcing faults caused by direct hard switching of the switch resistance, thereby affecting the performance and reliability of the circuit, and solving the problem of poor reliability of the circuit in the conventional light source adjusting circuit.

In one embodiment, the power switching circuit 100 includes: the first end of the first resistor is connected with the power supply, the second end of the first resistor and the first ends of the second resistors are connected to the control circuit 200 in a common mode, the second end of each second resistor is grounded through the first multi-gear switch, and the first multi-gear switch is used for switching on one or more second resistors to output a preset voltage signal to the control circuit 200.

For example, referring to fig. 2, the power switch circuit 100 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, and a first multi-stage switch S1, a first end of the resistor R1 is connected to the power supply, a second end of the resistor R1, a first end of the resistor R2, a first end of the resistor R3, and a first end of the resistor R4 are commonly connected to the control circuit 200, and a second end of the resistor R2, a second end of the resistor R3, and a second end of the resistor R4 are grounded through the first multi-stage switch S1.

It should be understood that the power switch circuit 100 including two preset voltage signals is illustrated in the present embodiment, and in other embodiments, the power switch circuit 100 may further include three or more preset voltage signals.

It should be understood that the first multi-position switch S1 is a mechanical switch such as a dial switch, a toggle switch or a key switch, and can be directly and manually operated by a user to switch the magnitude of the output preset voltage signal, so as to adjust the input power of the light source 30. The first multi-stage switch S1 may also be an electronic switch such as a multiplexer or a multiplexer, and the control circuit 200 outputs a level signal to control the on/off state of the first multi-stage switch S1. The resistances of the resistor R2, the resistor R3, and the resistor R4 are different, and the first multi-stage switch S1 can switch on at least one resistor, so that the power switch circuit 100 outputs different preset voltage signals, and the different preset voltage signals represent power parameter adjustments of different gears.

The power switch circuit 100 in this embodiment, by using the resistor R1, the resistor R2, the resistor R3, the resistor R4, and the first multi-stage switch S1, outputs of different preset voltage signals are realized, and the circuit is simple and is convenient for user operation.

Referring to fig. 3, in an embodiment, the dimming driving circuit 10 further includes a first interface 400, the first interface 400 is used for receiving an adjustment signal and outputting the adjustment signal to the second input terminal of the control circuit 200, and the adjustment signal is used for adjusting a matching relationship between the preset voltage signal and the output power.

It should be understood that the adjustment signal is used to calibrate the magnitude of the power adjustment parameter characterized by the preset voltage signal. For example, the preset voltage signal of 5V is matched to the output power of 20W before receiving the adjustment signal, and the control circuit 200 is matched to the preset voltage signal of 5V to the output power of 25W after receiving the adjustment signal indicating that the power adjustment parameter is increased by 25%.

Optionally, the first interface 400 is a power calibration interface, and the type thereof may be an electrical connection port, a connector, a USB interface, a wireless communication interface, and the like. The conditioning signal is an electrical signal. The first interface 400 may be connected to an external controller or an upper computer, and is configured to adjust a power adjustment parameter represented by the preset voltage signal according to an adjustment signal output by the external circuit.

Optionally, the first interface 400 may also be a switch interface, and the control circuit 200 modifies the matching relationship between the preset voltage signal and the output power by reading the on-off times of the switch.

The dimming driving circuit 10 in the present embodiment, through adding the first interface 400, the adjustment of the matching relationship between the preset voltage signal and the output power is realized, the corresponding relationship between the preset voltage signal and the first PWM signal is changed, thereby on the premise of not changing the hardware design of the original circuit, the input power of the light source 30 can be any target value, the problem that the conventional dimming driving circuit 10 encounters various special power conditions, the adjustment can not be performed through the resistance of the original circuit, the hardware replacement is performed by additionally searching the resistance with a proper resistance value, the operation is complex, and the problem that the proper resistance can not be found and the power is further changed can not be found.

Referring to fig. 4, in an embodiment, the dimming driving circuit 10 further includes a proportional regulating circuit 500, the proportional regulating circuit 500 is connected to the third input terminal of the control circuit 200, the proportional regulating circuit 500 is configured to provide a proportional regulating signal to the control circuit 200, and the control circuit 200 is configured to proportionally regulate the duty ratio of the first PWM signal to a target value.

It should be understood that the scaling signal may be an analog voltage signal within a target voltage range, with the scaling signal for each voltage value characterizing a scaling relationship, i.e., a scaling parameter. For example, the third input terminal of the control circuit 200 detects the proportional control signal (analog signal voltage range 0-5V, 5V max, 0V min), when the proportional control signal is adjusted in the range of 0-5V, the duty ratio of the first PWM signal changes in a linear proportion, for example, the first PWM signal is 50%, and the third input terminal of the control circuit 200 detects 1V, the control circuit 200 correspondingly outputs a PWM signal with a duty ratio of 20% by 50% to 10%; when the third input terminal of the control circuit 200 detects 5V, it outputs a PWM signal with a duty ratio of 100% by 50% to 50%; if the first PWM signal is 10%, the third input terminal of the control circuit 200 detects a voltage of 1V, the control circuit 200 outputs a PWM signal having a duty ratio of 20% by 10% by 2%, and if the third input terminal of the control circuit 200 detects 5V, the control circuit 200 outputs a PWM signal having a duty ratio of 100% by 10%.

It should be understood that, in the dimming driving circuit 10 in this embodiment, by adding the proportional adjustment circuit 500, the control circuit 200 proportionally adjusts the duty ratio of the first PWM signal to the target value and outputs the duty ratio to the dimming circuit 300, so as to implement secondary adjustment on the light source 30 in the specified power range, that is, to implement fine adjustment on the input current of the light source 30, and thus the brightness of the light source 30 is closer to the target brightness.

Referring to fig. 5, in one embodiment, the scaling circuit 500 includes: fixed regulating circuit 510, filter circuit 520 and switching circuit 530, switching circuit 530 is connected with the output of fixed regulating circuit 510 and the input of filter circuit 520. The fixed regulation circuit 510 is connected to the filter circuit 520 and the switch circuit 530, and the filter circuit 520 is connected to the control circuit 200. The fixed regulation circuit 510 is used for outputting a proportional regulation signal within a target voltage range; the filter circuit 520 is used for filtering out clutter interference of the proportion adjusting signal; the switch circuit 530 is used for switching in an external voltage signal to increase the voltage value of the proportional control signal or disconnecting an input path of the external voltage signal; the voltage value of the proportional adjustment signal matches the adjusted proportion of the duty cycle of the first PWM signal.

It should be understood that the fixed regulation circuit 510 may be constituted by a dimmer or a sensor or the like. The filter circuit 520 may be formed of a filter capacitor and a resistor. The switching circuit 530 may be constituted by a controllable electronic switch or a mechanical switch. The switch circuit 530 is a preset external interface for accessing an external voltage signal.

It should be understood that the voltage value of the proportional control signal matches the ratio, and may specifically be a positive correlation, that is, the larger the voltage value of the proportional control signal is, the larger the ratio of the adjustment of the duty ratio of the first PWM signal is; the negative correlation may be used, that is, the larger the voltage value of the proportional control signal is, the smaller the proportion of the adjustment of the duty ratio of the first PWM signal is. The proportional regulating circuit 500 in this embodiment implements lossless output of the proportional regulating signal by using the fixed regulating circuit 510 and the filter circuit 520, and implements expansion of the voltage range of the proportional regulating signal by adding the switch circuit 530, for example, when the proportional regulating signal output by the fixed regulating circuit is 10V, the voltage value of the proportional regulating signal output to the control circuit 200 is made to be 12V by adding the external voltage signal, for example, 2V, and the proportion of the regulation of the duty ratio of the first PWM signal is increased by the ratio of the voltage value of the external voltage signal to the total target voltage range value.

In one embodiment, the fixed regulation circuit 510 includes a dimmer for outputting a proportional regulation signal according to the regulation command. The proportional control signal in this embodiment is an analog voltage signal.

It should be understood that the light modulator in the present embodiment is a light modulation controller, and the user can select the magnitude of the outputted proportional adjustment signal autonomously, so as to achieve the convenience of operation for adjusting the light source 30.

In one embodiment, the fixed regulation circuit 510 includes a light-sensitive sensor for collecting ambient brightness and outputting a proportional regulation signal based on the ambient brightness. The proportional control signal in this embodiment is an analog voltage signal.

Optionally, when the ambient brightness is high, a low-ratio parameter may be output to convert the duty ratio of the first PWM signal into a target value with a smaller duty ratio, so as to reduce the input current of the light source 30 to the minimum at the target power level, further reduce the brightness of the light source 30, and save energy consumption.

The fixed adjusting circuit 510 in this embodiment, by using the photosensitive sensor, realizes further adjustment of the first PWM signal by automatically outputting the proportional adjustment signal according to the ambient brightness, so that the light source 30 autonomously adapts to the ambient brightness requirement under the target power shift, thereby saving unnecessary energy consumption and realizing intelligence control of the light source 30.

Optionally, in other embodiments, the fixed adjusting circuit 510 may further include a sound sensor, and the sound sensor collects sound and outputs a proportional adjusting signal according to the intensity of the sound, so as to implement further sound control adjustment on the first PWM signal in the target power shift.

Referring to fig. 6, in an embodiment, the dimming driving circuit 10 further includes an isolation circuit 600, the isolation circuit 600 is connected in series between the control circuit 200 and the dimming circuit 300, and the isolation circuit 600 is configured to isolate and output the first PWM signal to the dimming circuit 300.

It should be understood that the isolation circuit 600 may be formed by an isolation device such as an optocoupler U1. The dimming driving circuit 10 in this embodiment, by adding the isolation circuit 600, realizes isolated output of the first PWM signal, so that the dimming driving circuit 10 is safer and more reliable.

Referring to fig. 7, in an embodiment, the isolation circuit 600 includes an optical coupler U1, a first capacitor C1, a first zener diode D1, a first switch Q1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10, the fifth resistor R5 is connected to the control circuit 200, a second end of the fifth resistor R5 is connected to a positive input end of the optical coupler U1, a negative input end of the optical coupler U1 and a first end of the first capacitor C1 are connected to ground, a second end of the first capacitor C1 and a negative output end of the optical coupler U1 are connected to ground, a positive electrode of the first zener diode D1 is connected to ground, a negative electrode of the first zener diode D1 and a positive output end of the optical coupler U1 are connected, a positive output end of the U1 is further connected to a control end of the first switch Q1, a second end of the seventh resistor R1, a second end of the optical coupler R1 and a second end of the resistor R1, the first terminal of the sixth resistor R6 is connected to the power supply, the second terminal of the eighth resistor R8, the first terminal of the ninth resistor R9 and the high potential terminal of the first switch tube Q1 are connected in common, the second terminal of the ninth resistor R9 and the first terminal of the tenth resistor R10 are connected in common to the dimming circuit 300, the second terminal of the tenth resistor R10 is grounded, and the low potential terminal of the first switch tube Q1 is grounded. Optionally, the first switching tube Q1 is a controllable switching tube such as a MOS tube and a triode.

Referring to fig. 8, in an embodiment, the light source 30 includes a plurality of LED strings with different color temperatures, and the dimming driving circuit 10 further includes a color temperature adjusting circuit 700, where the color temperature adjusting circuit 700 is configured to turn on at least one of the LED strings to make the color temperature of the light source 30 be the target color temperature.

It should be understood that the color temperature adjusting circuit 700 in this embodiment may be directly switched by a multi-stage mechanical switch to adjust the color temperature, or may be switched by a multi-way electronic switch to adjust the color temperature.

Optionally, referring to fig. 9, in an embodiment, the light source 30 includes two LED strings with different color temperatures, and the color temperature adjusting circuit 700 includes a second switch tube Q2, a third switch tube Q3, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a second multi-stage switch S2. The positive electrode of the first LED string 31 is connected to the high potential end of the second switch tube Q2, the first end of the eleventh resistor R11, the high potential end of the third switch tube Q3 and the first end of the twelfth resistor R12, the second end of the eleventh resistor R11 is connected to the control end of the second switch tube Q2 and the first terminal of the second side of the second multi-stage switch S2, the second end of the twelfth resistor R12 is connected to the control end of the third switch tube Q3 and the second terminal of the second side of the second multi-stage switch S2, the first terminal and the second terminal of the first side of the second multi-stage switch S2 are connected to the second end of the thirteenth resistor R13, the first end of the thirteenth resistor R13 is connected to the positive electrode of the second LED string 32, the low potential end of the second switch tube Q2 is connected to the negative electrode of the first LED string 31, and the low potential end of the third switch tube Q3 is connected to the negative electrode of the second LED string 32.

It should be understood that in the present embodiment, three different color temperature adjustments can be achieved by only closing the first LED string 31, only closing the second LED string 32, or closing both the first LED string 31 and the second LED string 32. In other embodiments, the light source 30 further includes three or more LED strings with different color temperatures, the corresponding second multi-stage switch S2 is a three-stage or more-stage switch, and the number of the switch tubes is three or more.

Optionally, the switching power supply 20 may be connected to the utility power through an AC/DC constant voltage circuit 40, the switching power supply 20 may be a switching power supply circuit including a switching tube, an inductor, and the like, and the AC/DC constant voltage circuit 40 may be composed of an arrangement bridge and a constant voltage control chip.

A second aspect of the embodiments of the present application provides a lighting device, including a light source as described in the first aspect of the embodiments of the present application, the light source being connected to the dimming driving circuit.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A dimming driving circuit connected to a switching power supply of a light source, the dimming driving circuit comprising:

the control circuit is connected with the power switch circuit and used for outputting a corresponding first PWM signal according to the preset voltage signal output by the power switch circuit; and

2. The dimming driver circuit of claim 1, wherein the power switch circuit comprises: the first end of the first resistor is connected with a power supply, the second end of the first resistor and the first ends of the second resistors are connected to the control circuit in a common mode, the second end of each second resistor is grounded through the first multi-gear switch, and the first multi-gear switch is used for switching on one or more second resistors to output a preset voltage signal to the control circuit.

3. The dimming driver circuit of claim 1, further comprising a first interface for receiving a regulation signal and outputting the regulation signal to the control circuit, wherein the regulation signal is used for regulating the matching relationship between the preset voltage signal and the output power.

4. The dimming driving circuit according to any one of claims 1-3, further comprising a scaling circuit connected to the control circuit, the scaling circuit configured to provide a scaling signal to the control circuit, and the control circuit configured to scale the duty cycle of the first PWM signal to a target value according to the scaling signal.

5. The dimming drive circuit of claim 4, wherein the proportional adjustment circuit comprises:

6. The dimming driver circuit of claim 5, wherein the fixed regulation circuit comprises a dimmer for outputting the proportional regulation signal according to a regulation command.

7. The dimming driver circuit of claim 5, wherein the fixed adjustment circuit comprises a light sensitive sensor for collecting ambient brightness and outputting the proportional adjustment signal based on the ambient brightness.

8. The dimming drive circuit of claim 4, further comprising: the isolation circuit is connected between the control circuit and the dimming circuit in series and is used for isolating and outputting the first PWM signal to the dimming circuit.

9. The dimming driving circuit according to any one of claims 5-8, wherein the light source comprises a plurality of LED lamp strings with different color temperatures, and the dimming driving circuit further comprises a color temperature adjusting circuit for turning on at least one of the LED lamp strings to make the color temperature of the light source a target color temperature.

10. An illumination device, comprising:

a light source; and

the dimming driver circuit according to any one of claims 1-9, wherein the light source is connected to the dimming driver circuit.