A light source driving circuit, method, lighting system and storage medium

Abstract

A light source driving circuit, method, lighting system and storage medium are applied to the technical field of surgical lamps, and the light source driving circuit comprises a control unit and at least one driving unit; the control unit is used for receiving a brightness control signal and outputting one driving control signal to each corresponding driving unit; the driving unit is used for receiving one driving control signal and identifying it to determine the equivalent driving current represented thereby, generating a first current driving signal matched with the equivalent driving current and driving the light source to emit light when the equivalent driving current meets a first preset condition, and generating a second duty cycle driving signal and a second current driving signal matched with the equivalent driving current and driving the light source to emit light when the equivalent driving current meets a second preset condition. Since the constant current and the duty cycle can be jointly controlled based on one driving control signal, the driving control is optimized.

Description

Technical Field

[0001] This application relates to the field of light source driving technology, specifically to a light source driving circuit, method, lighting system, and storage medium. Background Technology

[0002] Surgical lights (also known as shadowless operating lights) are essential equipment in operating rooms. They provide illumination to the surgical site, offering doctors a good observation environment. Currently, surgical lights primarily use LED chips as their light source, which are highly reliable, have high luminous efficiency, and generate little heat. However, LED chips place high demands on the driving circuitry, and adjusting their brightness is relatively complex.

[0003] Current technical solutions allow the driving circuit to drive LED chips using constant current, PWM, or a combination of both. However, when using both constant current and PWM, the driving circuit needs to obtain the driving signals corresponding to the constant current and PWM signals from two separate control ports, making the control process relatively complex. Therefore, a new technical solution is needed. Summary of the Invention

[0004] The main technical problem addressed in this application is the relatively complex driving and control of the light source.

[0005] According to a first aspect, one embodiment provides a light source driving circuit, including a control unit and at least one driving unit;

[0006] The control unit is used to receive a brightness control signal, generate a drive control signal based on the brightness control signal, and output one drive control signal to each corresponding drive unit.

[0007] The driving unit is configured to receive one driving control signal, identify the driving control signal to determine its equivalent driving current, and generate a duty cycle driving signal and / or a current driving signal matching the equivalent driving current. The duty cycle driving signal characterizes the duty cycle of the driving light source, and the current driving signal characterizes the driving current of the driving light source. The driving unit is capable of responding to the duty cycle driving signal and / or the current driving signal, and driving the light source to emit light with the duty cycle corresponding to the duty cycle driving signal and / or the driving current corresponding to the current driving signal.

[0008] When the equivalent driving current meets the first preset condition, the driving unit generates a first current driving signal that matches the equivalent driving current, and can respond to the first current driving signal to drive the light source to emit light with the driving current corresponding to the first current driving signal.

[0009] When the equivalent driving current meets the second preset condition, the driving unit generates a second duty cycle driving signal and a second current driving signal that match the equivalent driving current, and can respond to the second duty cycle driving signal and the second current driving signal to drive the light source to emit light with the duty cycle corresponding to the second duty cycle driving signal and the driving current corresponding to the second current driving signal.

[0010] In one embodiment, the driving unit includes a signal recognition circuit, a duty cycle signal generation circuit, a current signal generation circuit, and a driving circuit;

[0011] The signal recognition circuit is used to receive one of the drive control signals and to identify the drive control signal in order to determine the equivalent drive current it represents.

[0012] The duty cycle signal generation circuit is used to generate a duty cycle drive signal;

[0013] The current signal generation circuit is used to generate a current drive signal;

[0014] The driving circuit can respond to the duty cycle driving signal and / or the current driving signal, and drive the light source to emit light with the duty cycle corresponding to the duty cycle driving signal and / or the driving current corresponding to the current driving signal.

[0015] In one embodiment:

[0016] When the drive control signal is a duty cycle drive signal, the signal recognition circuit includes a duty cycle recognition circuit. The duty cycle recognition circuit is used to compare the duty cycle drive signal with a reference voltage, and obtain a first level when the duty cycle drive signal is higher than the reference voltage, and obtain a second level when the duty cycle drive signal is lower than the reference voltage. The duty cycle recognition circuit determines the duty cycle of the duty cycle drive signal based on the time ratio of the obtained first level and second level, so as to determine the equivalent drive current it represents.

[0017] or,

[0018] When the drive control signal is a current drive signal, the signal identification circuit includes an analog-to-digital conversion circuit. The analog-to-digital conversion circuit is used to convert the current drive signal into a digital current drive signal. The analog-to-digital conversion circuit determines the voltage amplitude of the current drive signal based on the digital current drive signal, so as to determine the equivalent drive current it represents.

[0019] In one embodiment, the driving unit further includes a controller for executing programs and / or instructions to achieve a corresponding function, wherein:

[0020] The controller acquires the voltage amplitude or duty cycle identified by the signal recognition circuit and determines the equivalent drive current it represents.

[0021] The controller determines whether the equivalent drive current meets the first preset condition and / or whether it meets the second preset condition;

[0022] When the equivalent drive current meets the first preset condition, the controller outputs a first current control signal that matches the equivalent drive current. The first current control signal is used to control the current signal generation circuit to generate the first current drive signal.

[0023] When the equivalent drive current meets the second preset condition, the controller outputs a second current control signal and a second duty cycle control signal that match the equivalent drive current. The second current control signal is used to control the current signal generation circuit to generate the second current drive signal, and the second duty cycle control signal is used to control the duty cycle signal generation circuit to generate the second duty cycle drive signal.

[0024] In one embodiment:

[0025] The duty cycle signal generation circuit includes a PWM signal generation circuit, which is used to generate a PWM drive signal with a corresponding duty cycle based on the duty cycle control signal output by the controller.

[0026] And / or,

[0027] The current signal generation circuit includes a digital-to-analog converter circuit, which is used to generate an analog voltage drive signal with a corresponding voltage amplitude based on the current control signal output by the controller.

[0028] In one embodiment, the first preset condition is satisfied when the equivalent drive current is greater than the preset drive current; and / or, the second preset condition is satisfied when the equivalent drive current is less than the preset drive current.

[0029] In one embodiment:

[0030] The duty cycle signal generation circuit is used to generate a second duty cycle drive signal corresponding to the ratio of the equivalent drive current to the preset drive current, and to generate a first level when the equivalent drive current is less than the preset drive current, so that the duty cycle signal generation circuit responds to the first level and outputs the second duty cycle drive signal to the drive circuit.

[0031] The current signal generation circuit is used to generate a first current driving signal corresponding to the equivalent driving current, and to perform an OR logic operation between the first current driving signal and the second current driving signal corresponding to the preset driving current and output the signal, so that when the equivalent driving current is greater than the preset driving current, the first current driving signal is output to the driving circuit, and when the equivalent driving current is less than the preset driving current, the second current driving signal is output to the driving circuit.

[0032] In one embodiment, the duty cycle drive signal is a PWM drive signal, and the duty cycle signal generation circuit includes a PWM signal generation circuit, a comparator, and a switching device.

[0033] The PWM signal generation circuit is used to generate a PWM drive signal based on the equivalent drive current, which corresponds to the ratio of the equivalent drive current to the preset drive current.

[0034] The comparator's first input terminal is used to input the second current drive signal, its second input terminal is used to input the first current drive signal, and its output terminal is used to output a first level when the equivalent drive current is less than the preset drive current.

[0035] The first terminal of the switching device receives the PWM drive signal, the second terminal is connected to the drive circuit, and the control terminal is used to input the first level output by the comparator; wherein, the switching device turns on in response to the first level, and causes the PWM drive signal to be output to the drive circuit.

[0036] In one embodiment, the current driving signal is an analog voltage driving signal, and the current signal generation circuit includes an OR logic circuit and a digital-to-analog converter circuit.

[0037] The digital-to-analog converter circuit is used to generate an analog voltage drive signal corresponding to the equivalent drive current;

[0038] The first input terminal of the OR logic circuit receives the analog voltage drive signal generated by the digital-to-analog converter circuit, and the second input terminal of the OR logic circuit receives the analog voltage drive signal corresponding to the preset drive current. The OR logic circuit is used to perform an OR operation on the signals input from the first input terminal and the second input terminal and then output the result to the drive circuit.

[0039] In one embodiment, the drive control signal is either the duty cycle drive signal or the current drive signal; wherein the duty cycle drive signal is a PWM drive signal, and the current drive signal is an analog voltage drive signal.

[0040] In one embodiment:

[0041] The control unit includes a first substrate, on which a first circuit manufactured by a first integrated circuit process is provided. The first circuit has a drive control terminal, which is used to output a drive control signal.

[0042] The driving unit includes a second substrate, on which a second circuit manufactured by a second integrated circuit process is provided. The second circuit has a driving input terminal and a driving output terminal. One of the driving input terminals is connected to a driving control terminal to receive a driving control signal output by the control unit. The driving output terminal is used to connect to a light source to drive the light source to emit light.

[0043] According to a second aspect, one embodiment provides a light source driving circuit, including a control unit and at least one driving unit;

[0044] The control unit is used to receive a brightness control signal, generate a drive control signal based on the brightness control signal, and output one drive control signal to each corresponding drive unit.

[0045] The driving unit is configured to receive one driving control signal, identify the driving control signal to determine its equivalent driving current, and generate a duty cycle driving signal and a current driving signal matching the equivalent driving current. The duty cycle driving signal characterizes the duty cycle of the driving light source, and the current driving signal characterizes the driving current of the driving light source. The driving unit is capable of responding to the duty cycle driving signal and the current driving signal, and driving the light source to emit light with the duty cycle corresponding to the duty cycle driving signal and the driving current corresponding to the current driving signal. Wherein:

[0046] When the equivalent driving current meets the first preset condition, the driving unit generates a first duty cycle driving signal and a first current driving signal that match the equivalent driving current according to the first generation rule, and can respond to the first duty cycle driving signal and the first current driving signal to drive the light source to emit light with the duty cycle corresponding to the first duty cycle driving signal and the driving current corresponding to the first current driving signal.

[0047] When the equivalent driving current meets the second preset condition, the driving unit generates a second duty cycle driving signal and a second current driving signal that match the equivalent driving current according to the second generation rule, and can respond to the second duty cycle driving signal and the second current driving signal to drive the light source to emit light with the duty cycle corresponding to the second duty cycle driving signal and the driving current corresponding to the second current driving signal.

[0048] The first generation rule is different from the second generation rule.

[0049] In one embodiment:

[0050] When the equivalent drive current meets the first preset condition, the drive current corresponding to the first current drive signal and the equivalent drive current have a first relationship.

[0051] When the equivalent drive current meets the second preset condition, the drive current corresponding to the second current drive signal has a second relationship with the equivalent drive current; wherein, the first relationship is different from the second relationship;

[0052] or,

[0053] When the equivalent drive current is greater than the preset drive current, the drive unit generates a first current drive signal that matches the equivalent drive current, and generates a first duty cycle drive signal that matches the first current drive signal.

[0054] When the equivalent drive current is less than the preset drive current, the drive unit generates a second current drive signal that matches the preset drive current, and generates a second duty cycle drive signal that corresponds to the ratio of the equivalent drive current to the preset drive current.

[0055] According to a third aspect, one embodiment provides a light source driving circuit, including at least one driving unit;

[0056] The driving unit is used to drive the light source to emit light according to a driving control signal; the driving unit includes a signal recognition circuit, a duty cycle signal generation circuit, a current signal generation circuit, and a driving circuit;

[0057] The signal recognition circuit is used to receive one of the drive control signals and to identify the drive control signal in order to determine the equivalent drive current it represents.

[0058] The duty cycle signal generation circuit is used to generate a duty cycle drive signal, which is used to characterize the duty cycle of the driving light source; the current signal generation circuit is used to generate a current drive signal, which is used to characterize the driving current of the driving light source.

[0059] The duty cycle signal generation circuit and the current signal generation circuit are capable of generating a first duty cycle drive signal and a first current drive signal that match the equivalent drive current; the drive circuit is capable of responding to the first duty cycle drive signal and the first current drive signal, and driving the light source to emit light with the duty cycle corresponding to the first duty cycle drive signal and the drive current corresponding to the first current drive signal.

[0060] According to a fourth aspect, one embodiment provides a lighting system, comprising:

[0061] The brightness setting module is used to receive the user's brightness setting input and output the corresponding brightness control signal;

[0062] A light source, used to emit light;

[0063] The light source driving circuit as described in the first, second, or third aspect is used to drive the corresponding light source to emit light based on the brightness control signal.

[0064] According to a fifth aspect, one embodiment provides a light source driving method, comprising:

[0065] One drive control signal is identified to determine the equivalent drive current it represents;

[0066] A duty cycle drive signal and a current drive signal matching the equivalent drive current are generated. The duty cycle drive signal characterizes the duty cycle of the driving light source, and the current drive signal characterizes the drive current of the driving light source. Wherein:

[0067] Under the condition that the equivalent driving current meets the first preset condition, a first current driving signal matching the equivalent driving current is generated, and the light source is driven to emit light in response to the first current driving signal and the driving current corresponding to the first current driving signal is used.

[0068] Under the condition that the equivalent driving current meets the second preset condition, a second duty cycle driving signal and a second current driving signal that match the equivalent driving current are generated. The light source is driven to emit light in response to the second duty cycle driving signal and the second current driving signal, and the light source is driven to emit light with the duty cycle corresponding to the second duty cycle driving signal and the driving current corresponding to the second current driving signal.

[0069] According to a sixth aspect, one embodiment provides a computer-readable storage medium storing a program that can be executed by a processor to implement the method as described in the fifth aspect.

[0070] According to the light source driving circuit, method, lighting system, and storage medium of the above embodiments, the driving unit is configured to receive one driving control signal, identify the driving control signal to determine its equivalent driving current, and generate a duty cycle driving signal and a current driving signal that match the equivalent driving current. In response to the duty cycle driving signal and the current driving signal, the unit drives the light source to emit light with the corresponding duty cycle and driving current. Since constant current and duty cycle control can be achieved based on a single driving control signal, driving control is optimized. Attached Figure Description

[0071] Figure 1 This is a schematic diagram of the structure of a light source driving circuit according to one embodiment;

[0072] Figure 2 This is a schematic diagram of the light source driving circuit according to another embodiment;

[0073] Figure 3 This is a schematic diagram of the structure of a light source driving circuit according to another embodiment;

[0074] Figure 4 This is a schematic diagram of the structure of a light source driving circuit according to one embodiment;

[0075] Figure 5 This is a schematic diagram of the structure of a light source driving circuit according to one embodiment;

[0076] Figure 6 This is a schematic diagram of the structure of a PWM signal voltage conversion circuit according to one embodiment;

[0077] Figure 7 This is a flowchart illustrating a light source driving method according to one embodiment;

[0078] Figure 8 This is a schematic diagram of the structure of a lighting system according to one embodiment. Detailed Implementation

[0079] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; the relevant operations can be fully understood based on the description in the specification and general technical knowledge in the art.

[0080] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0081] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0082] In current technical solutions, when driving LED chips using both constant current and PWM, the driving circuit needs to acquire an analog voltage drive signal from one drive input terminal to achieve constant current control, and an PWM drive signal from another drive input terminal to achieve PWM control. Therefore, each driving circuit requires two drive input terminals to achieve both constant current and PWM driving, and the controller also needs two corresponding drive control terminals to output the corresponding drive control signals, making the control process relatively complex.

[0083] In some embodiments of this application, the driving circuit can achieve joint control of constant current and PWM by acquiring a single driving control signal. Specifically, when the driving circuit acquires a single driving control signal, it identifies the driving control signal to determine the equivalent driving current for joint control of constant current and PWM. Then, based on the equivalent driving current, it generates a driving signal corresponding to constant current and a driving signal corresponding to PWM. Finally, the driving circuit responds to the driving signals corresponding to constant current and PWM respectively and drives the light source to emit light, thereby achieving joint control of constant current and PWM based on a single driving control signal to optimize driving control. Furthermore, when the driving current equivalent to a single driving control signal meets different conditions, different generation rules can be used to generate the driving signal corresponding to constant current and / or the driving signal corresponding to PWM, thus satisfying different control requirements.

[0084] Some embodiments provide a light source driving circuit for driving a light source to emit light. Please refer to... Figure 1 The light source driving circuit includes a control unit 10 and at least one driving unit 20, which will be described in detail below.

[0085] The control unit 10 is used to receive the brightness control signal and generate a corresponding drive control signal based on the brightness control signal.

[0086] In some embodiments, the light source typically has a maximum luminous intensity; therefore, the brightness range of the light source can be from zero to its maximum luminous intensity, allowing the light source to emit light within its luminous range. In some embodiments, the brightness of the light source can be determined based on a brightness control signal, which can be generated based on user input or automatically based on current control conditions. For example, a user inputs a desired brightness within the light source's brightness range, causing a brightness control signal corresponding to the desired brightness to be generated; or, for instance, when the ambient brightness does not meet the desired brightness, a brightness control signal corresponding to the desired brightness is generated. In some embodiments, the brightness control signal can be a digital signal or an analog signal.

[0087] In some embodiments, after receiving the brightness control signal, the control unit 10 can generate a corresponding drive control signal based on the brightness control signal. For example, there is a corresponding relationship between the brightness control signal and the drive control signal, and the corresponding drive control signal is generated based on the corresponding relationship. For example, the control unit 10 parses the brightness control signal to determine the corresponding expected brightness, and then generates the corresponding drive control signal based on the expected brightness.

[0088] In some embodiments, the drive control signal output by the control unit 10 is a duty cycle drive signal or a current drive signal. The duty cycle drive signal characterizes the duty cycle of the driving light source, and the current drive signal characterizes the driving current of the driving light source. For example, when the brightness control signal corresponds to the maximum luminous brightness, the generated duty cycle drive signal corresponds to a 100% duty cycle, and the generated current drive signal corresponds to the maximum driving current. For example, when the brightness control signal corresponds to half of the maximum luminous brightness, the generated duty cycle drive signal corresponds to a 50% duty cycle, and the generated current drive signal corresponds to half of the maximum driving current. In this case, the corresponding drive control signal can be generated based on the brightness control signal according to the corresponding proportional relationship, or it can be generated based on the expected brightness. In some embodiments, the duty cycle drive signal is a PWM drive signal. In some embodiments, the current drive signal is an analog voltage drive signal. In this case, the maximum voltage value of the analog voltage drive signal corresponds to the maximum driving current, and other voltage values ​​can be used to determine the corresponding driving current according to a proportional relationship, which will not be elaborated further here.

[0089] The control unit 10 outputs a drive control signal to each corresponding drive unit 20.

[0090] In some embodiments, the brightness control signal can be used to control one drive unit 20 or multiple drive units 20, and the control unit 10 outputs a drive control signal to each drive unit 20 that needs to be controlled, thereby controlling the corresponding drive unit 20 to drive the corresponding light source to emit light.

[0091] In some embodiments, the control unit 10 may be a different chip from the drive unit 20. For example, the control unit 10 includes a first substrate with a first circuit manufactured using a first integrated circuit process. The first circuit has at least one drive control terminal, and each drive control terminal is used to output a drive control signal. In some embodiments, the control unit 10 may be implemented based on control chips such as MCU, FPGA, and CPU.

[0092] The above is a description of the control unit 10, which is mainly used to generate drive control signals based on the brightness control signals and output one drive control signal to each drive unit 20 that needs to be controlled. The drive unit 20 is described in detail below.

[0093] Each corresponding driving unit 20 is used to receive one driving control signal and drive the corresponding light source to emit light according to one driving control signal.

[0094] In some embodiments, the driving unit 20 can drive a single light source to emit light, or it can drive multiple light sources to emit light. In some embodiments, the driving unit 20 identifies a driving control signal to determine its equivalent driving current. The equivalent driving current is the final equivalent driving current of the driving light source's duty cycle and driving current; the specific equivalent calculation process is not detailed here. For example, when the driving control signal is a duty cycle driving signal, if the duty cycle driving signal corresponds to the maximum duty cycle, then its equivalent driving current is the maximum driving current of the light source; if the duty cycle driving signal corresponds to one-third of the maximum duty cycle, then its equivalent driving current is one-third of the maximum driving current. When the driving control signal is a current driving signal, if the current driving signal corresponds to the maximum driving current, then its equivalent driving current is the maximum driving current of the light source; if the current driving signal corresponds to one-third of the maximum driving current, then its equivalent driving current is one-third of the maximum driving current. Therefore, after identifying the drive control signal, the equivalent drive current corresponding to the drive control signal can be determined based on the proportional relationship or correspondence between the drive control signal and its corresponding maximum value.

[0095] The driving unit 20 can generate a duty cycle driving signal and a current driving signal that match the equivalent driving current, and the driving unit 20 can respond to the generated duty cycle driving signal and current driving signal, and drive the light source to emit light with the duty cycle corresponding to the duty cycle driving signal and the driving current corresponding to the current driving signal.

[0096] In some embodiments, the drive unit 20 can generate a duty cycle drive signal and a current drive signal, so that when a single drive control signal is obtained, duty cycle control and drive current control can be implemented based on the duty cycle drive signal and the current drive signal respectively, so that complex control of both duty cycle and drive current can be achieved based on a single drive control signal.

[0097] In some embodiments, when generating a duty cycle drive signal and a current drive signal that match the equivalent drive current, the drive unit 20 can generate different drive signals depending on different situations. In some embodiments, the duty cycle corresponding to the duty cycle drive signal generated by the drive unit 20 and / or the drive current corresponding to the generated current drive signal are ultimately equivalent to the equivalent drive current, thereby matching the generated duty cycle drive signal and / or current drive signal with the equivalent drive current.

[0098] In some embodiments, when the equivalent driving current meets a first preset condition, the driving unit 20 generates a first current driving signal matching the equivalent driving current, and is able to respond to the first current driving signal by driving the light source to emit light with the driving current corresponding to the first current driving signal. When the equivalent driving current meets a second preset condition, the driving unit 20 generates a second duty cycle driving signal and a second current driving signal matching the equivalent driving current, and is able to respond to the second duty cycle driving signal and the second current driving signal by driving the light source to emit light with the duty cycle corresponding to the second duty cycle driving signal and the driving current corresponding to the second current driving signal. The first preset condition differs from the second preset condition.

[0099] In the above embodiments, when the equivalent driving current meets the first preset condition, the driving unit 20 generates a first current driving signal. At this time, it can be considered that when the driving unit 20 responds to the first current driving signal, it drives the light source to emit light with the driving current corresponding to the first current driving signal and a default duty cycle. For example, the default duty cycle can be a 100% duty cycle or other default duty cycles. Specifically, when the default duty cycle is a 100% duty cycle, it can be considered that in the above embodiments, when the equivalent driving current meets the first preset condition, the driving unit 20 drives the light source to emit light based on a constant current method; when the equivalent driving current meets the second preset condition, the driving unit 20 drives the light source to emit light jointly based on both a constant current method and a duty cycle method, thereby satisfying different driving requirements.

[0100] In some embodiments, a first preset condition is met when the equivalent drive current is greater than a preset drive current, and a second preset condition is met when the equivalent drive current is less than the preset drive current. The preset drive current can be configured according to actual conditions. For example, when the light source has a minimum drive current, this minimum drive current can be configured as the preset drive current, so that when the equivalent drive current is greater than the minimum drive current, constant current driving is used, and when the equivalent drive current is less than the minimum drive current, constant current driving and duty cycle driving are used together.

[0101] In some embodiments, when the equivalent drive current meets the second preset condition, that is, the equivalent drive current is less than the minimum drive current, the drive unit 20 can generate a second current drive signal corresponding to the preset drive current, and generate a second duty cycle drive signal corresponding to the ratio of the equivalent drive current to the preset drive current, so that the duty cycle corresponding to the second duty cycle drive signal and the drive current corresponding to the second current drive signal are ultimately equivalent to the equivalent drive current.

[0102] For example, when the drive control signal is a PWM drive signal and the maximum drive current of the light source is YA (amperes), when the duty cycle of the PWM is greater than a%, the drive unit 20 generates a corresponding current drive signal, causing a constant current to drive the light source. For example, when the duty cycle of the PWM drive signal is 90%, the drive current corresponding to the current drive signal is 0.9YA; when the duty cycle is 80%, the drive current corresponding to the current drive signal is 0.8YA; when the duty cycle is n% of the preset drive current, the drive current corresponding to the current drive signal no longer changes, i.e., it remains n%*YA. At this time, if the duty cycle of the PWM drive signal is less than n%, for example, when the duty cycle of the PWM drive signal is M%, the drive unit 20 also generates a corresponding duty cycle drive signal, the duty cycle of which is (m / n)%, thus driving the light source based on both constant current and duty cycle, or it can be understood as driving the light source based on the duty cycle under the condition of a preset drive current. When driving a light source with a constant current, flickering can be avoided. Setting a preset drive current can also prevent changes in the color of the light source, such as preventing changes in the color of LED light. When a duty cycle is required to drive the light source, the frequency of the duty cycle drive signal can be set to a high operating frequency (typically above 20kHz, where flickering is imperceptible), thus avoiding the effects of flickering.

[0103] In the above embodiments, when the equivalent driving current meets the first preset condition, it can be considered that the driving unit 20 drives the light source to emit light with the driving current corresponding to the first current driving signal and the default duty cycle when responding to the first current driving signal. In some embodiments, when the equivalent driving current meets the first preset condition, the driving unit 20 can also generate a corresponding first duty cycle driving signal, so that when responding to the first current driving signal and the first duty cycle driving signal, the light source is driven to emit light with the driving current corresponding to the first current driving signal and the duty cycle corresponding to the first duty cycle driving signal. A detailed explanation follows.

[0104] In some embodiments, when the equivalent drive current meets a first preset condition, the driving unit 20 generates a first duty cycle drive signal and a first current drive signal matching the equivalent drive current according to a first generation rule, and is able to respond to the first duty cycle drive signal and the first current drive signal to drive the light source to emit light with the duty cycle corresponding to the first duty cycle drive signal and the drive current corresponding to the first current drive signal. When the equivalent drive current meets a second preset condition, the driving unit 20 generates a second duty cycle drive signal and a second current drive signal matching the equivalent drive current according to a second generation rule, and is able to respond to the second duty cycle drive signal and the second current drive signal to drive the light source to emit light with the duty cycle corresponding to the second duty cycle drive signal and the drive current corresponding to the second current drive signal. The first generation rule differs from the second generation rule, and the first preset condition also differs from the second preset condition.

[0105] In some embodiments, when the equivalent drive current meets a first preset condition, the first generation rule may be that the drive current corresponding to the first current drive signal and the equivalent drive current have a first relationship. When the equivalent drive current meets a second preset condition, the second generation rule may be that the drive current corresponding to the second current drive signal and the equivalent drive current have a second relationship. The first relationship differs from the second relationship; for example, the drive current corresponding to the first current drive signal and the equivalent drive current may have a first proportional relationship, and the drive current corresponding to the second current drive signal and the equivalent drive current may have a second proportional relationship. In some embodiments, when the equivalent drive current is greater than a preset drive current, the first preset condition is met. When the equivalent drive current is less than the preset drive current, the second preset condition is met; this will not be elaborated further here.

[0106] In some embodiments, when the equivalent drive current meets a first preset condition, the first generation rule can be that the drive current corresponding to the first current drive signal is equal to the equivalent drive current, and the duty cycle corresponding to the first duty cycle drive signal is 100%. When the equivalent drive current meets a second preset condition, the second generation rule can be that the drive current corresponding to the second current drive signal is equal to the preset drive current, and the duty cycle corresponding to the first duty cycle drive signal is the ratio of the equivalent drive current to the preset drive current. In this embodiment, the first generation rule is equivalent to the above embodiment, where the drive unit 20 drives the light source to emit light with the drive current corresponding to the first current drive signal and the default duty cycle, which will not be described in detail here.

[0107] In some embodiments, the driving unit 20 and the control unit 10 belong to different chips. That is, the driving unit 20 includes a second substrate, on which a second circuit manufactured by a second integrated circuit process is provided. The second circuit has a driving input terminal and a driving output terminal. One driving input terminal of the driving unit 20 is connected to one driving control terminal of the control unit 10 to receive a driving control signal output by the control unit 10. The driving output terminal is used to connect to a light source to drive the light source to emit light.

[0108] The above describes the driving method of the driving unit 20. The driving unit 20 can drive the light source with constant current and duty cycle based on one driving control signal. The following describes the specific implementation of the driving unit 20.

[0109] Please refer to Figure 2 The driving unit 20 can implement each corresponding function based on each circuit. In some embodiments, the driving unit 20 includes a signal recognition circuit 22, a duty cycle signal generation circuit 24, a current signal generation circuit 26, and a driving circuit 28.

[0110] The signal recognition circuit 22 is used to receive one drive control signal and recognize one drive control signal to determine the equivalent drive current it represents.

[0111] In some embodiments, when the drive control signal is a duty cycle drive signal, the signal recognition circuit 22 includes a duty cycle recognition circuit. This duty cycle recognition circuit compares the duty cycle drive signal with a reference voltage, obtaining a first level when the duty cycle drive signal is higher than the reference voltage and a second level when the duty cycle drive signal is lower than the reference voltage. The duty cycle recognition circuit determines the duty cycle of the duty cycle drive signal based on the time ratio of the obtained first and second levels, in order to determine the equivalent drive current it represents. In some embodiments, the duty cycle recognition circuit can be implemented based on a counter, which counts the pulses of the duty cycle drive signal to achieve duty cycle recognition. The counter can be based on a clock provided by a clock circuit to achieve duty cycle recognition; for example, the clock circuit can be included within the drive unit 20 or external to the drive unit 20, which will not be elaborated further here.

[0112] In some embodiments, when the drive control signal is a current drive signal, the signal identification circuit 22 includes an analog-to-digital converter (ADC). The ADC converts the current drive signal from analog to digital to obtain a digital current drive signal. Based on the digital current drive signal, the ADC determines the voltage amplitude of the current drive signal to determine its equivalent drive current. In some embodiments, the ADC can be implemented using an analog-to-digital converter (ADC), which converts the current drive signal into a digital signal and quantizes it to obtain the corresponding voltage amplitude.

[0113] The duty cycle signal generation circuit 24 is used to generate a duty cycle drive signal. In some embodiments, the duty cycle signal generation circuit 24 generates the corresponding PWM drive signal based on the PWM signal generation circuit.

[0114] The current signal generation circuit 26 is used to generate a current drive signal. In some embodiments, the current signal generation circuit 26 may be based on a digital-to-analog converter (ADC) to output an analog voltage drive signal.

[0115] The driving circuit 28 is capable of responding to a duty cycle driving signal and / or a current driving signal, driving the light source to emit light with the duty cycle corresponding to the duty cycle driving signal and / or the driving current corresponding to the current driving signal. In some embodiments, the driving circuit 28 can be an existing driving circuit 28, which can control the duty cycle in response to a PWM driving signal or control the driving current in response to an analog voltage driving signal. In some embodiments, when the driving circuit 28 does not receive an externally input PWM driving signal, the driving circuit 28 is equivalent to driving the light source with a 100% duty cycle. In some embodiments, when the driving circuit 28 does not receive an externally input analog voltage driving signal, the driving circuit 28 is equivalent to driving the light source with the maximum driving current.

[0116] In the above embodiments, the driving unit 20 implements various functions based on various circuits, thus enabling it to drive the light source with both constant current and duty cycle based on a single driving control signal. When the driving unit 20 needs to drive the light source in different ways depending on different situations, it can be implemented in software or hardware, as will be explained in detail below.

[0117] Please refer to Figure 3 In some embodiments, when implemented in a software-based manner, the drive unit 20 further includes a control device 21, which executes programs and / or instructions to achieve corresponding functions. Specifically, the control device 21 acquires the voltage amplitude or duty cycle identified by the signal recognition circuit 22 and determines the equivalent drive current it represents. The control device 21 then determines whether the equivalent drive current meets a first preset condition and / or a second preset condition.

[0118] In some embodiments, when the equivalent drive current meets a first preset condition, the controller 21 outputs a first current control signal matching the equivalent drive current. The first current control signal is used to control the current signal generation circuit 26 to generate a first current drive signal. When the equivalent drive current meets a second preset condition, the controller 21 outputs a second current control signal and a second duty cycle control signal matching the equivalent drive current. The second current control signal is used to control the current signal generation circuit 26 to generate a second current drive signal, and the second duty cycle control signal is used to control the duty cycle signal generation circuit 24 to generate a second duty cycle drive signal.

[0119] In some embodiments, when the equivalent drive current meets a first preset condition, the controller 21 outputs a first current control signal and a first duty cycle control signal matching the equivalent drive current according to a first generation rule. The first current control signal is used to control the current signal generation circuit 26 to generate a first current drive signal, and the first duty cycle control signal is used to control the duty cycle signal generation circuit 24 to generate a first duty cycle drive signal. When the equivalent drive current meets a second preset condition, the controller 21 outputs a second current control signal and a second duty cycle control signal matching the equivalent drive current according to a second generation rule. The second current control signal is used to control the current signal generation circuit 26 to generate a second current drive signal, and the second duty cycle control signal is used to control the duty cycle signal generation circuit 24 to generate a second duty cycle drive signal.

[0120] In the above embodiments, the duty cycle signal generation circuit 24 and the current signal generation circuit 26 are used to output corresponding drive signals under the control of the controller 21. The duty cycle signal generation circuit 24 includes a PWM signal generation circuit, which generates a PWM drive signal with a corresponding duty cycle based on the duty cycle control signal output by the controller 21. The current signal generation circuit 26 includes a digital-to-analog converter circuit, which generates an analog voltage drive signal with a corresponding voltage amplitude based on the current control signal output by the controller 21.

[0121] Please refer to Figure 4 In some embodiments, when implemented in hardware, the duty cycle signal generation circuit 24 is used to generate a second duty cycle drive signal corresponding to the ratio of the equivalent drive current to the preset drive current, and to generate a first level when the equivalent drive current is less than the preset drive current, so that the duty cycle signal generation circuit 24 responds to the first level and outputs the second duty cycle drive signal to the drive circuit 28.

[0122] The current signal generation circuit 26 is used to generate a first current drive signal corresponding to the equivalent drive current, and to perform an OR logic operation between the first current drive signal and a second current drive signal corresponding to the preset drive current and output the signal, so that when the equivalent drive current is greater than the preset drive current, the first current drive signal is output to the drive circuit 28, and when the equivalent drive current is less than the preset drive current, the second current drive signal is output to the drive circuit 28.

[0123] In some embodiments, the duty cycle signal generation circuit 24 generates a second level when the equivalent drive current is greater than a preset drive current, and responds to the second level by stopping the output of the second duty cycle drive signal to the drive circuit 28. At this time, stopping the output of the second duty cycle drive signal to the drive circuit 28 can also be considered as outputting the first duty cycle drive signal to the drive circuit 28, where the duty cycle corresponding to the first duty cycle drive signal is 100%. In some embodiments, the duty cycle signal generation circuit 24 can select whether to output the second duty cycle drive signal based on a switching device, or it can select whether to send the first duty cycle drive signal or the second duty cycle drive signal to the drive circuit 28 based on a selection switch. The first duty cycle drive signal and the second duty cycle drive signal can be generated separately. The first level and the second level are respectively a high level and a low level.

[0124] In the above embodiments, when the equivalent driving current is greater than the preset driving current, the current signal generation circuit 26 outputs a first current driving signal corresponding to the equivalent driving current to the driving circuit 28 after performing an OR logic operation, while the duty cycle signal generation circuit 24 responds to the second level by stopping the output of the second duty cycle driving signal to the driving circuit 28, or responds to the second level by outputting the first duty cycle driving signal to the driving circuit 28. This causes the driving circuit 28 to drive the light source to emit light in a constant current manner. When the equivalent driving current is less than the preset driving current, the current signal generation circuit 26 outputs a second current driving signal corresponding to the preset driving current to the driving circuit 28 after performing an OR logic operation, while the duty cycle signal generation circuit 24 responds to the first level by outputting the second duty cycle driving signal to the driving circuit 28. This causes the driving circuit 28 to drive the light source to emit light jointly in a constant current and duty cycle manner.

[0125] Please refer to Figure 4 In some embodiments, the duty cycle drive signal is a PWM drive signal. The duty cycle signal generation circuit 24 includes a PWM signal generation circuit 242, a comparator 244, and a switching device 246. The PWM signal generation circuit 242 generates a PWM drive signal based on the ratio of the equivalent drive current to a preset drive current, such as a clock provided by a clock circuit. The first input terminal of the comparator 244 is used to input a second current drive signal, the second input terminal is used to input a first current drive signal, and the output terminal is used to output a first level when the equivalent drive current is less than the preset drive current, and a second level otherwise. The first terminal of the switching device 246 receives the PWM drive signal, the second terminal is connected to the drive circuit 28, and the control terminal is used to input the first or second level output by the comparator 244. The switching device 246 turns on in response to the first level, causing the PWM drive signal to be output to the drive circuit 28, and turns off in response to the second level. In some embodiments, the switching device 246 can be implemented based on a device with switching function such as a transistor or a field-effect transistor, which will not be described in detail here.

[0126] Please refer to Figure 4 In some embodiments, the current driving signal is an analog voltage driving signal (analog voltage), and the current signal generation circuit 26 includes an OR logic circuit 264 and a digital-to-analog converter circuit 262. The digital-to-analog converter circuit 262 generates an analog voltage driving signal corresponding to the equivalent driving current. The first input terminal of the OR logic circuit 264 receives the analog voltage driving signal generated by the digital-to-analog converter circuit 262, and the second input terminal of the OR logic circuit 264 receives the analog voltage driving signal corresponding to a preset driving current. The OR logic circuit 264 is used to perform an OR operation on the signals input to the first and second input terminals and then output the result to the driving circuit 28.

[0127] In some embodiments, the analog voltage corresponding to the preset drive current can be provided internally by the drive unit 20 or externally by the drive unit 20. In some embodiments, the analog voltage corresponding to the preset drive current can be a fixed value, that is, the corresponding preset drive current is also a fixed value. In some embodiments, the analog voltage corresponding to the preset drive current can also be adjusted according to actual needs, that is, the corresponding preset drive current can also be adjusted.

[0128] Please refer to Figure 5 In some embodiments, the drive unit 20 further includes a PWM signal recognition circuit 23 and a PWM signal voltage conversion circuit 25, wherein the PWM signal recognition circuit 23 is used to identify the duty cycle of the PWM signal. The PWM signal voltage conversion circuit 25 is used to convert the PWM signal into an analog voltage corresponding to its duty cycle, and use the analog voltage as the analog voltage corresponding to the preset drive current.

[0129] In some embodiments, the PWM signal recognition circuit 23 can be implemented based on a counter. Please refer to [reference needed]. Figure 6 The PWM signal voltage conversion circuit 25 includes a capacitor C1 and a resistor R1. The first end of the resistor R1 is used to receive the PWM signal, and the second end of the resistor R1 is connected to the first end of the capacitor C1. The second end of the capacitor C1 is grounded (GND1). The node between the first end of the resistor R1 and the first end of the capacitor C1 is used to output the analog voltage (V) corresponding to the PWM signal. iledj In this embodiment, based on the voltage division of the PWM signal between the capacitor and the resistor, the PWM signal voltage conversion circuit 25 can output different analog voltages based on the duty cycle of the PWM signal. This can be achieved by the control unit 10 outputting the PWM signal to the PWM signal recognition circuit 23.

[0130] In the above embodiments, when the PWM signal recognition circuit 23 acquires PWM signals with different duty cycles, it can generate different analog voltages based on the PWM signal voltage conversion circuit 25, thereby adjusting the analog voltage corresponding to the preset drive current. The PWM signal recognition circuit 23 also identifies the PWM signal based on the clock provided by the clock circuit, thus enabling the PWM signal generation circuit 242 to continue generating the corresponding PWM drive signal according to the ratio of the equivalent drive current to the preset drive current.

[0131] The above is an explanation of the light source driving circuit. The following is a detailed explanation of the light source driving method.

[0132] Some embodiments provide a light source driving method that can be applied to the light source driving circuit described above. Please refer to... Figure 7 The light source driving method includes the following steps:

[0133] Step 100: Determine the equivalent drive current of the drive control signal. Identify one drive control signal to determine its equivalent drive current.

[0134] Step 110: Generate a duty cycle drive signal and a current drive signal that match the equivalent drive current. Under the condition that the equivalent drive current meets a first preset condition, generate a first current drive signal that matches the equivalent drive current, respond to the first current drive signal, and drive the light source to emit light with the drive current corresponding to the first current drive signal; under the condition that the equivalent drive current meets a second preset condition, generate a second duty cycle drive signal and a second current drive signal that match the equivalent drive current, respond to the second duty cycle drive signal and the second current drive signal, and drive the light source to emit light with the duty cycle corresponding to the second duty cycle drive signal and the drive current corresponding to the second current drive signal.

[0135] Other steps or further specific steps of the light source driving method can be referred to the light source driving circuit in the above embodiments, and will not be repeated here.

[0136] Some embodiments provide a lighting system, which includes a brightness setting module 30, a light source, and a light source driving circuit.

[0137] The brightness setting module 30 is used to receive the user's brightness setting input and output the corresponding brightness control signal. In some embodiments, the brightness setting module 30 can receive the user's brightness setting input and output the corresponding brightness control signal based on a touch screen, button, knob, or other means.

[0138] The light source is used to emit light. In some embodiments, the light source is an LED chip.

[0139] The light source driving circuit is used to drive the corresponding light source to emit light based on the brightness control signal. In some embodiments, the light source driving circuit adopts the light source driving circuit in the above embodiments, which will not be described again here.

[0140] Some embodiments provide a computer-readable storage medium storing a program that can be executed by a processor to implement the light source driving method described above.

[0141] Those skilled in the art will understand that all or part of the functions of the various methods in the above embodiments can be implemented by hardware or by computer programs. When all or part of the functions in the above embodiments are implemented by computer programs, the program can be stored in a computer-readable storage medium, which may include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to achieve the above functions. For example, the program can be stored in the memory of a device, and when the program in the memory is executed by the processor, all or part of the above functions can be achieved. In addition, when all or part of the functions in the above embodiments are implemented by computer programs, the program can also be stored in a server, another computer, disk, optical disk, flash drive, or external hard drive, etc., and can be downloaded or copied to the memory of a local device, or the system of the local device can be updated. When the program in the memory is executed by the processor, all or part of the functions in the above embodiments can be achieved.

[0142] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A light source driving circuit, characterized in that, Includes a control unit and at least one drive unit; The control unit is used to receive a brightness control signal, generate a drive control signal based on the brightness control signal, and output one drive control signal to each corresponding drive unit. The driving unit is used to receive one of the driving control signals, identify the driving control signal to determine the equivalent driving current it represents, and generate a duty cycle driving signal and / or a current driving signal that matches the equivalent driving current. The duty cycle driving signal is used to represent the duty cycle of the driving light source, and the current driving signal is used to represent the driving current of the driving light source. The driving unit is capable of responding to the duty cycle driving signal and / or the current driving signal, and driving the light source to emit light with the duty cycle corresponding to the duty cycle driving signal and / or the driving current corresponding to the current driving signal; wherein: When the equivalent driving current meets the first preset condition, the driving unit generates a first current driving signal that matches the equivalent driving current, and can respond to the first current driving signal to drive the light source to emit light with the driving current corresponding to the first current driving signal. When the equivalent driving current meets the second preset condition, the driving unit generates a second duty cycle driving signal and a second current driving signal that match the equivalent driving current, and can respond to the second duty cycle driving signal and the second current driving signal to drive the light source to emit light with the duty cycle corresponding to the second duty cycle driving signal and the driving current corresponding to the second current driving signal.

2. The light source driving circuit as described in claim 1, characterized in that, The driving unit includes a signal recognition circuit, a duty cycle signal generation circuit, a current signal generation circuit, and a driving circuit. The signal recognition circuit is used to receive one of the drive control signals and to identify the drive control signal in order to determine the equivalent drive current it represents. The duty cycle signal generation circuit is used to generate a duty cycle drive signal; The current signal generation circuit is used to generate a current drive signal; The driving circuit can respond to the duty cycle driving signal and / or the current driving signal, and drive the light source to emit light with the duty cycle corresponding to the duty cycle driving signal and / or the driving current corresponding to the current driving signal.

3. The light source driving circuit as described in claim 2, characterized in that: When the drive control signal is a duty cycle drive signal, the signal recognition circuit includes a duty cycle recognition circuit. The duty cycle recognition circuit is used to compare the duty cycle drive signal with a reference voltage, and obtain a first level when the duty cycle drive signal is higher than the reference voltage, and obtain a second level when the duty cycle drive signal is lower than the reference voltage. The duty cycle identification circuit determines the duty cycle of the duty cycle drive signal based on the time ratio of the first level and the second level, in order to determine the equivalent drive current it represents. or, When the drive control signal is a current drive signal, the signal identification circuit includes an analog-to-digital conversion circuit. The analog-to-digital conversion circuit is used to convert the current drive signal into a digital current drive signal. The analog-to-digital conversion circuit determines the voltage amplitude of the current drive signal based on the digital current drive signal, so as to determine the equivalent drive current it represents.

4. The light source driving circuit as described in claim 3, characterized in that, The drive unit further includes a controller, which executes programs and / or instructions to achieve corresponding functions, wherein: The controller acquires the voltage amplitude or duty cycle identified by the signal recognition circuit and determines the equivalent drive current it represents. The controller determines whether the equivalent drive current meets the first preset condition and / or whether it meets the second preset condition; When the equivalent drive current meets the first preset condition, the controller outputs a first current control signal that matches the equivalent drive current. The first current control signal is used to control the current signal generation circuit to generate the first current drive signal. When the equivalent drive current meets the second preset condition, the controller outputs a second current control signal and a second duty cycle control signal that match the equivalent drive current. The second current control signal is used to control the current signal generation circuit to generate the second current drive signal, and the second duty cycle control signal is used to control the duty cycle signal generation circuit to generate the second duty cycle drive signal.

5. The light source driving circuit as described in claim 4, characterized in that: The duty cycle signal generation circuit includes a PWM signal generation circuit, which is used to generate a PWM drive signal with a corresponding duty cycle based on the duty cycle control signal output by the controller. And / or, The current signal generation circuit includes a digital-to-analog converter circuit, which is used to generate an analog voltage drive signal with a corresponding voltage amplitude based on the current control signal output by the controller.

6. The light source driving circuit as described in claim 2, characterized in that, When the equivalent drive current is greater than the preset drive current, the first preset condition is satisfied; and / or, when the equivalent drive current is less than the preset drive current, the second preset condition is satisfied.

7. The light source driving circuit as described in claim 6, characterized in that: The duty cycle signal generation circuit is used to generate a second duty cycle drive signal corresponding to the ratio of the equivalent drive current to the preset drive current, and to generate a first level when the equivalent drive current is less than the preset drive current, so that the duty cycle signal generation circuit responds to the first level and outputs the second duty cycle drive signal to the drive circuit. The current signal generation circuit is used to generate a first current driving signal corresponding to the equivalent driving current, and to perform an OR logic operation between the first current driving signal and the second current driving signal corresponding to the preset driving current and output the signal, so that when the equivalent driving current is greater than the preset driving current, the first current driving signal is output to the driving circuit, and when the equivalent driving current is less than the preset driving current, the second current driving signal is output to the driving circuit.

8. The light source driving circuit as described in claim 7, characterized in that, The duty cycle drive signal is a PWM drive signal, and the duty cycle signal generation circuit includes a PWM signal generation circuit, a comparator, and a switching device. The PWM signal generation circuit is used to generate a PWM drive signal based on the equivalent drive current, which corresponds to the ratio of the equivalent drive current to the preset drive current. The comparator's first input terminal is used to input the second current drive signal, its second input terminal is used to input the first current drive signal, and its output terminal is used to output a first level when the equivalent drive current is less than the preset drive current. The first terminal of the switching device receives the PWM drive signal, the second terminal is connected to the drive circuit, and the control terminal is used to input the first level output by the comparator; wherein, the switching device turns on in response to the first level, and causes the PWM drive signal to be output to the drive circuit.

9. The light source driving circuit as described in claim 7, characterized in that, The current driving signal is an analog voltage driving signal, and the current signal generation circuit includes an OR logic circuit and a digital-to-analog converter circuit. The digital-to-analog converter circuit is used to generate an analog voltage drive signal corresponding to the equivalent drive current; The first input terminal of the OR logic circuit receives the analog voltage drive signal generated by the digital-to-analog converter circuit, and the second input terminal of the OR logic circuit receives the analog voltage drive signal corresponding to the preset drive current. The OR logic circuit is used to perform an OR operation on the signals input from the first input terminal and the second input terminal and then output the result to the drive circuit.

10. The light source driving circuit as described in claim 1, characterized in that, The drive control signal is either the duty cycle drive signal or the current drive signal; wherein the duty cycle drive signal is a PWM drive signal and the current drive signal is an analog voltage drive signal.

11. The light source driving circuit as described in claim 1, characterized in that: The control unit includes a first substrate, on which a first circuit manufactured by a first integrated circuit process is provided. The first circuit has a drive control terminal, which is used to output a drive control signal. The driving unit includes a second substrate, on which a second circuit manufactured by a second integrated circuit process is provided. The second circuit has a driving input terminal and a driving output terminal. One of the driving input terminals is connected to a driving control terminal to receive a driving control signal output by the control unit. The driving output terminal is used to connect to a light source to drive the light source to emit light.

12. A light source driving circuit, characterized in that, Includes a control unit and at least one drive unit; The control unit is used to receive a brightness control signal, generate a drive control signal based on the brightness control signal, and output one drive control signal to each corresponding drive unit. The driving unit is used to receive one of the driving control signals, identify one of the driving control signals to determine the equivalent driving current it represents, and generate a duty cycle driving signal and a current driving signal that match the equivalent driving current. The duty cycle driving signal is used to represent the duty cycle of the driving light source, and the current driving signal is used to represent the driving current of the driving light source. The driving unit is capable of responding to the duty cycle driving signal and the current driving signal, and driving the light source to emit light with the duty cycle corresponding to the duty cycle driving signal and the driving current corresponding to the current driving signal; wherein: When the equivalent driving current meets the first preset condition, the driving unit generates a first duty cycle driving signal and a first current driving signal that match the equivalent driving current according to the first generation rule, and can respond to the first duty cycle driving signal and the first current driving signal to drive the light source to emit light with the duty cycle corresponding to the first duty cycle driving signal and the driving current corresponding to the first current driving signal. When the equivalent driving current meets the second preset condition, the driving unit generates a second duty cycle driving signal and a second current driving signal that match the equivalent driving current according to the second generation rule, and can respond to the second duty cycle driving signal and the second current driving signal to drive the light source to emit light with the duty cycle corresponding to the second duty cycle driving signal and the driving current corresponding to the second current driving signal. The first generation rule is different from the second generation rule.

13. The light source driving circuit as described in claim 12, characterized in that: When the equivalent drive current meets the first preset condition, the drive current corresponding to the first current drive signal and the equivalent drive current have a first relationship. When the equivalent drive current meets the second preset condition, the drive current corresponding to the second current drive signal has a second relationship with the equivalent drive current; wherein, the first relationship is different from the second relationship; or, When the equivalent drive current is greater than the preset drive current, the drive unit generates a first current drive signal that matches the equivalent drive current, and generates a first duty cycle drive signal that matches the first current drive signal. When the equivalent drive current is less than the preset drive current, the drive unit generates a second current drive signal that matches the preset drive current, and generates a second duty cycle drive signal that corresponds to the ratio of the equivalent drive current to the preset drive current.

14. A light source driving circuit, characterized in that, Includes at least one drive unit; The driving unit is used to drive the light source to emit light according to a driving control signal; the driving unit includes a signal recognition circuit, a duty cycle signal generation circuit, a current signal generation circuit, and a driving circuit; The signal recognition circuit is used to receive one of the drive control signals and to identify the drive control signal in order to determine the equivalent drive current it represents. The duty cycle signal generation circuit is used to generate a duty cycle drive signal, which is used to characterize the duty cycle of the driving light source. The current signal generation circuit is used to generate a current driving signal, which is used to characterize the driving current of the driving light source. The duty cycle signal generation circuit and the current signal generation circuit are capable of generating a first duty cycle drive signal and a first current drive signal that match the equivalent drive current. The driving circuit can respond to the first duty cycle driving signal and the first current driving signal, and drive the light source to emit light with the duty cycle corresponding to the first duty cycle driving signal and the driving current corresponding to the first current driving signal.

15. A lighting system, characterized in that, include: The brightness setting module is used to receive the user's brightness setting input and output the corresponding brightness control signal; A light source, used to emit light; The light source driving circuit according to any one of claims 1-14 is used to drive the corresponding light source to emit light based on the brightness control signal.

16. A light source driving method, characterized in that, include: One drive control signal is identified to determine the equivalent drive current it represents; A duty cycle drive signal and a current drive signal matching the equivalent drive current are generated. The duty cycle drive signal characterizes the duty cycle of the driving light source, and the current drive signal characterizes the drive current of the driving light source. Wherein: Under the condition that the equivalent driving current meets the first preset condition, a first current driving signal matching the equivalent driving current is generated, and the light source is driven to emit light in response to the first current driving signal and the driving current corresponding to the first current driving signal is used. Under the condition that the equivalent driving current meets the second preset condition, a second duty cycle driving signal and a second current driving signal that match the equivalent driving current are generated. The light source is driven to emit light in response to the second duty cycle driving signal and the second current driving signal, and the light source is driven to emit light with the duty cycle corresponding to the second duty cycle driving signal and the driving current corresponding to the second current driving signal.

17. A computer-readable storage medium, characterized in that, The medium stores a program that can be executed by a processor to implement the light source driving method as described in claim 16.

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