Driver circuit

Abstract

Driver circuit, characterized in that it comprises the following: a first selector circuit (110) which is coupled to the first connection of a lighting component; a second selector circuit (120) which is coupled to the second terminal of the lighting component; a control circuit (130) wherein its first output terminal is configured to output a first control signal, and its second output terminal is configured to output a second control signal, wherein the first control signal and the second control signal are multiplexed in time; a first driver circuit (140) and a second driver circuit (150) coupled to the first selector circuit (110), and a third driver circuit (160) and a fourth driver circuit (170) coupled to the second selector circuit (120); in response to the first control signal, the first driver circuit (140) coupled to the first output terminal activates the first selector circuit (110) so that the first terminal of the light component is coupled to the supply voltage, and the fourth driver circuit (170) coupled to the first output terminal activates the second selector circuit (120) so that the second terminal of the light component is coupled to ground;In response to the second control signal, the third driver circuit (160) coupled to a second output terminal activates a second selector circuit (120) so that the second terminal of the lighting component is coupled to the supply voltage, and the second driver circuit (150) coupled to the second output terminal activates the first selector circuit (110) so that the first terminal of the lighting component is coupled to ground.

Description

TECHNICAL AREA

[0001] The present application relates to the field of lighting technology, in particular a driver circuit. STATE OF THE ART

[0002] With the advancement of lighting technology, traditional lamps can no longer meet people's needs. Light-emitting diodes (LEDs) offer advantages such as high conversion efficiency, excellent color rendering, and dimmability. As a result, they are widely used in a variety of lighting scenarios.

[0003] In practical applications, arrays of single-row, multiple rows, and / or multiple columns of LEDs are used to generate suitable light and ensure sufficient brightness. However, when multiple rows and multiple columns of LEDs are used, the timing of the LED lighting must be configured to produce light with varying brightness.

[0004] However, the existing driver solution still needs improvement. CONTENT OF THE PRESENT APPLICATION

[0005] In light of this, the present application provides for a driver circuit that can enable rapid changes in color temperature and improve the user experience.

[0006] The present application provides for a driver circuit comprising the following: A first selector circuit that is coupled to the first connection of a lighting component; A second selector circuit, which is coupled to the second connection of the lighting component; A control circuit, wherein its first output terminal is configured to output a first control signal, and its second output terminal is configured to output a second control signal, wherein the first control signal and the second control signal are multiplexed in time; A first driver circuit and a second driver circuit coupled to the first selector circuit, and a third driver circuit and a fourth driver circuit coupled to the second selector circuit; in response to the first control signal, the first driver circuit coupled to the first output terminal activates the first selector circuit so that the first terminal of the light component is coupled to the supply voltage, and the fourth driver circuit coupled to the first output terminal activates the second selector circuit so that the second terminal of the light component is coupled to ground;In response to the second control signal, the third driver circuit, coupled to a second output terminal, activates the second selector circuit, so that the second terminal of the lighting component is coupled to the supply voltage, and the second driver circuit, coupled to the second output terminal, activates the first selector circuit, so that the first terminal of the lighting component is coupled to ground.

[0007] Compared to the prior art, the technical solution of the present application has the following advantages: In the driver circuit described in the present application, the control circuit can temporally multiplex the output of a first control signal and a second control signal. This makes it possible to temporally multiplex and select paired first and fourth driver circuits as well as paired second and third driver circuits. This allows different circuit paths to be selected and activated, causing the lighting component to illuminate according to different lighting modes. In other words, by configuring the interval between the first and second control signals, it is possible to shorten the illumination interval of the lighting component on different circuit paths. This allows the color temperature to be changed quickly, thus improving the user experience. BRIEF DESCRIPTION OF THE DRAWING Fig. Figure 1 shows a schematic structural representation of a driver circuit according to an embodiment of the present application; Fig. Figure 2 shows a partially schematic structural representation of a driver circuit of the first type according to an embodiment of the present application; Fig. Figure 3 shows a partially schematic structural representation of a driver circuit of the second type according to an embodiment of the present application; Fig. Figure 4 shows a partially schematic structural representation of a driver circuit of the third type according to an embodiment of the present application; Fig. Figure 5 shows a partially schematic structural representation of a driver circuit of the fourth type according to an embodiment of the present application; Fig. Figure 6 shows a partially schematic structural representation of a driver circuit of the fifth type according to an embodiment of the present application; Fig. Figure 7 shows a schematic structural representation of a detection circuit according to an embodiment of the present application. DETAILED DESCRIPTION

[0008] The various embodiments of the present invention will now be described in more detail with reference to the drawings. In the different drawings, the same elements are represented by the same or similar reference numerals. For clarity, the individual parts are not shown to scale in the drawings.

[0009] In a lighting solution with multiple rows and / or columns of LEDs, the illumination state of the LEDs varies depending on the wiring path. For example, the LED has a first illumination state and a second illumination state.

[0010] Inverters are typically used to control the timing of LED lighting. This allows the LED to switch between a first and second lighting state. However, the inverter can burn out during this switching process. Furthermore, this solution can only control one LED circuit at a time; asynchronous control is not possible.

[0011] To solve the aforementioned technical problems, the present application provides a driver circuit in which the control circuit can temporally multiplex the output of a first and a second control signal. This makes it possible to temporally multiplex and select paired first and fourth driver circuits as well as paired second and third driver circuits. Thus, different circuit paths can be selected and activated, causing the lighting component to illuminate according to different lighting modes. In other words, by configuring the interval between the first and second control signals, it is possible to shorten the illumination interval of the lighting component on different circuit paths. This allows for rapid changes in color temperature, which improves the user experience.

[0012] In order to enable experts in the field to better understand and implement the present disclosure, the specific solutions, principles, advantages and effects of the present application are described in detail with reference to specific embodiments and the drawings.

[0013] Regarding the in Fig. The schematic structural representation of a driver circuit shown in Figure 1, according to an embodiment of the present application, is the driver circuit as shown in Figure 1. Fig. 1 shown, coupled with the lighting component and serves to drive the lighting component to light up.

[0014] The driver circuit may include the following: A first selector circuit 110, which is coupled to the first connection of a lighting component; A second selector switch 120, which is coupled to the second connection of the lighting component; A control circuit 130, wherein its first output terminal is configured to output a first control signal, and its second output terminal is configured to output a second control signal, wherein the first control signal and the second control signal are multiplexed in time; A first driver circuit 140 and a second driver circuit 150, coupled to the first selector circuit 110, and a third driver circuit 160 and a fourth driver circuit 170, coupled to the second selector circuit 120; In response to the first control signal, the first driver circuit 140, coupled to the first output terminal, activates the first selector circuit 110, so that the first terminal of the illuminating component is coupled to the supply voltage VDD, and the fourth driver circuit 170, coupled to the first output terminal, activates the second selector circuit 120, so that the second terminal of the illuminating component is coupled to ground;In response to the second control signal, the third driver circuit 160, coupled to a second output terminal, activates the second selector circuit 120, so that the second terminal of the lighting component is coupled to the supply voltage VDD, and the second driver circuit 150, coupled to the second output terminal, activates the first selector circuit 110, so that the first terminal of the lighting component is coupled to ground.

[0015] When the control circuit 130 outputs the first control signal at a given time, i.e., the first control signal is at a high level “1”, both the first driver circuit 140 and the fourth driver circuit 170 are switched on in response to the first control signal.

[0016] When the first driver circuit 140 is switched on, the first selector circuit 110 is then selected and switched on, thus establishing the path from the supply voltage VDD to the first terminal of the lighting component. Simultaneously, when the fourth driver circuit 170 is switched on, the second selector circuit 120 is also selected and switched on, thus establishing the path from the second terminal of the lighting component to ground, and the lighting component then assumes its first illuminated state.

[0017] At a subsequent point in time, control circuit 130 outputs the second control signal, i.e., the second control signal is at a high level "1". In response to this second control signal, both the second driver circuit 150 and the third driver circuit 160 are switched on. This establishes the path between the second terminal of the light component and the supply voltage VDD, and the path from the first terminal of the light component to ground. The light component then assumes its second illuminated state.

[0018] In this way, if lighting components with different color temperatures are arranged on different circuit paths, it is possible to shorten the illumination interval of the lighting component on different circuit paths by configuring the interval between the first control signal and the second control signal (i.e., an interval in which the lighting component is in a "dead zone" and does not illuminate). This allows the color temperature to be changed quickly, which improves the user experience.

[0019] It should be noted that, firstly, the in Fig. 1. The connection relationship of the driver circuits shown is merely an illustrative example and serves to demonstrate that the color temperature of the luminous component can be changed by arranging the first to fourth driver circuits using the control circuit; Secondly, the luminous component in the present application comprises several columns or several rows of LEDs, wherein each pair of columns or two rows of LEDs has opposite conduction paths.

[0020] To better illustrate and explain the functionality and structure of the driver circuit in the present application, separate explanations are given below using examples.

[0021] In the present application, the first and third driver circuits have identical structures but respond to different control signals. The first and third driver circuits are switched on in a time-multiplexed manner to selectively switch on the first and second selector circuits, thus establishing different potentials at the first and second terminals of the lighting component.

[0022] The following explanation uses the structure of the first driver circuit as an example.

[0023] In some embodiments, in combination with Fig. 1, the first driver circuit 140 with reference to the in Fig. Figure 2 shows a partially schematic structural representation of a driver circuit of the first type according to an embodiment of the present application, as shown in Fig. Figure 2 shows: a switch circuit 210 coupled to a first output terminal CW1 and configured to output a first initial driver signal as a function of the supply voltage VDD when switched on in response to a first control signal; a first amplifier circuit 220 coupled to the switch circuit 210 and to the first selector circuit 110, respectively, and configured to amplify the first initial driver signal to generate a first driver signal which is then output to the first selector circuit 110.

[0024] The third driver circuit has the same structure as the first driver circuit. The switch circuit in the third driver circuit is coupled to the second output terminal, and the first amplifier circuit is coupled to the second selector circuit to generate a second driver signal, which is then output to the second selector circuit.

[0025] For example, the switching circuit 210 can comprise the following: a first voltage divider branch and a switching branch. The first voltage divider branch is designed to divide the voltage of the first control signal so that the divided signal can drive the switching branch and thereby switch on the downstream circuit. The arrangement of the voltage divider branch also provides protection that reduces the risk of damage to the switching branch from an excessively high first control signal.

[0026] In some embodiments, the first voltage divider branch comprises: a first resistor R11 and a second resistor R12, wherein the first terminal of the first resistor R11 is coupled to the first terminal of the second resistor R12 and to the first output terminal CW1, while the second terminal of the first resistor R11 is connected to the first ground GND; the second terminal of the second resistor R12 is coupled to the switch branch.

[0027] The switching branch comprises a first transistor M11 and a third resistor R13, wherein the control terminal of the first transistor M11 is coupled to the first voltage divider branch, the first terminal of the first transistor M11 is coupled to the first terminal of the third resistor R13 and to the first amplifier circuit 220, the second terminal of the first transistor M11 is connected to the first ground GND; the second terminal of the third resistor R13 receives the supply voltage VDD.

[0028] In particular, the control terminal of the first transistor M11 receives the first control signal. Under the influence of the supply voltage VDD, this causes the first transistor M11 to be switched on.

[0029] In some embodiments, the first amplifier circuit 220 comprises a first totem pole. By using a totem pole circuit, the current output and sink power of the driver circuit can be significantly increased, and the switching speed can be considerably improved at the same time.

[0030] For example, the first totem pole comprises: a second transistor M12 and a third transistor M13, wherein the control terminal of the second transistor M12 is coupled to the control terminal of the third transistor M13 and to the switching circuit 210, the first terminal of the second transistor M12 is connected to the first ground GND, while the second terminal of the second transistor M12 is coupled to the second terminal of the third transistor M13 and to the first selector circuit 110; the first terminal of the third transistor M13 receives the supply voltage VDD.

[0031] In particular, when the first transistor M11 is in the on state, the supply voltage VDD can be applied to the control terminals of the second transistor M12 and the third transistor M13, causing the second transistor M12 and the third transistor M13 to be switched on. This amplifies the initial driver signal and generates the first driver signal.

[0032] Accordingly, in combination with Fig. 1 and Fig. 2, the third driver circuit 160 with reference to the in Fig. Figure 3 shows a partially schematic structural representation of a driver circuit of the second type according to an embodiment of the present application, which has the same structure as the first driver circuit 140. The difference is that the third driver circuit 160 is coupled to the second selector circuit 120, whereas the first driver circuit 140 is coupled to the first selector circuit 110.

[0033] For example, the switching circuit in the third driver circuit 160 is coupled to the second output terminal VW1, wherein the switching circuit comprises: a first switching resistor R21, a second switching resistor R22 and a first switching transistor M21; The first amplifier circuit is coupled to the second selector circuit 120, wherein the first amplifier circuit comprises: a first amplifier transistor M22 and a second amplifier transistor M23.

[0034] Further details regarding the third driver circuit 160 can be found in the description below. Fig. 2 regarding the first driver circuit 140 can be taken from.

[0035] In the present application, the second and fourth driver circuits have identical structures but respond to different control signals. The second and fourth driver circuits are switched on in a time-multiplexed manner to selectively switch on the first and second selector circuits, thus establishing different potentials at the first and second terminals of the lighting component.

[0036] The following explanation uses the structure of the second driver circuit as an example.

[0037] In combination with Fig. The second driver circuit 150 comprises components 1 to 3, with reference to the information in Fig. Figure 4 shows a partially schematic structural representation of a driver circuit of the third type according to an embodiment of the present application, as shown in Fig. Figure 4 shows: a push-pull circuit 310 coupled to the control circuit 130 and configured to output a second initial driver signal depending on the supply voltage VDD when switching on in response to the second control signal; a second amplifier circuit 320 coupled to both the push-pull circuit 310 and the first selector circuit 110, configured to amplify the second initial driver signal to generate a second driver signal which is then output to the first selector circuit 110.

[0038] The fourth driver circuit has the same structure as the second driver circuit. The push-pull circuit in the fourth driver circuit is coupled to the first output terminal, and the second amplifier circuit is coupled to the second selector circuit to generate a fourth driver signal, which is then output to the second selector circuit.

[0039] For example, the push-pull circuit 310 comprises the following: a second voltage divider branch and a push-pull branch. The second voltage divider branch is designed to divide the voltage of the second control signal, so that the divided signal can drive the push-pull branch and thereby switch on the downstream circuit. The arrangement of the second voltage divider branch also provides protection, reducing the risk of damage to the push-pull branch from an excessively high second control signal.

[0040] Accordingly, the use of a push-pull branch increases the efficiency, output power and driving capability of the second driver circuit 150, while significantly reducing distortion and static power consumption.

[0041] In some embodiments, the second voltage divider branch comprises: a fourth resistor R41 and a fifth resistor R42, wherein the first terminal of the fourth resistor R41 is coupled to the second output terminal VW1 and to the first terminal of the fifth resistor R42, while the second terminal of the fourth resistor R41 is connected to the first ground GND; the second terminal of the fifth resistor R42 is coupled to the push-pull branch.

[0042] The push-pull branch comprises a fourth transistor M41 and a fifth transistor M42, wherein the control terminal of the fourth transistor M41 is coupled to the second voltage divider branch, the first terminal of the fourth transistor M41 is coupled to the control terminal of the fifth transistor M42 and receives the supply voltage VDD, the second terminals of the fourth transistor M41 and the fifth transistor M42 are connected to the first ground GND; the first terminal of the fifth transistor M42 is coupled to the second amplifier circuit 320.

[0043] In some embodiments, the second amplifier circuit 320 comprises a second totem pole, wherein the second totem pole comprises: a sixth transistor M43 and a seventh transistor M44, wherein the control terminal of the sixth transistor M43 is coupled to the control terminal of the seventh transistor M44 and to the push-pull circuit 310, the first terminal of the sixth transistor M43 is connected to the first ground GND, while the second terminal of the sixth transistor M43 is coupled to the second terminal of the seventh transistor M44 and to the first selector circuit 110; the first terminal of the seventh transistor M44 receives the supply voltage VDD.

[0044] Regarding the functioning of the second totem pole, reference is made to the description of the first totem pole.

[0045] Accordingly, in combination with Fig. 1 to 4, the fourth driver circuit 170 with reference to the in Fig. 5, a partially schematic structural representation of a driver circuit of the fourth type shown according to an embodiment of the present application, has the same structure as the second driver circuit 150, as in Fig. 5 shown. The difference is that the fourth driver circuit 170 is coupled to the second selector circuit 120, while the second driver circuit 150 is coupled to the first selector circuit 110.

[0046] For example, the push-pull circuit in the fourth driver circuit 170 is coupled to the first output terminal CW1, wherein the push-pull circuit comprises: a first push-pull resistor R31, a second push-pull resistor R32, a first push-pull transistor M31, and a second push-pull transistor M32; The second amplifier circuit is coupled to the second selector circuit 120, wherein the second amplifier circuit comprises: a third amplifier transistor M33 and a fourth amplifier transistor M34. Further details regarding the fourth driver circuit 170 can be found in the description at Fig. 4 regarding the second driver circuit 150 can be taken from the diagram.

[0047] In combination with Fig. 1 to 5, as in Fig. Figure 6 shows the first selector switch 110 with reference to the one in Fig. Figure 6 shows a partially schematic structural representation of a driver circuit of the fifth type according to an embodiment of the present application: a first half-bridge branch formed by the eighth transistor M1 and the ninth transistor M2, wherein the control terminal of the eighth transistor M1 is coupled to the first driver circuit 140, the first terminal of the eighth transistor M1 receives the supply voltage VDD, the second terminal of the eighth transistor M1 is coupled to the second terminal of the ninth transistor M2 and is further coupled to the first terminal of the illuminating component; the control terminal of the ninth transistor M2 is coupled to the second driver circuit 150, while the first terminal of the ninth transistor M1 is connected to the second ground AGND.

[0048] In other words, the present application achieves different potentials at the first and second terminals of the lighting component by switching the eighth transistor M1 and the ninth transistor M2 through in a time-multiplexed manner.

[0049] For example, if the eighth transistor M1 is switched on, the first terminal of the light component is connected to the supply voltage VDD; if, on the other hand, the ninth transistor M2 is switched on, the first terminal of the light component is connected to the second ground AGND.

[0050] Accordingly, the second selector circuit 120 comprises: a second half-bridge branch formed by the tenth transistor M3 and the eleventh transistor M4, wherein the control terminal of the tenth transistor M3 is coupled to the third driver circuit 160, the first terminal of the tenth transistor M3 receives the supply voltage VDD, the second terminal of the tenth transistor M3 is coupled to the second terminal of the eleventh transistor M4 and further coupled to the second terminal of the illuminating component; the control terminal of the eleventh transistor M4 is coupled to the fourth driver circuit 170, while the first terminal of the eleventh transistor is connected to the second ground AGND.

[0051] In other words, the present application achieves different potentials at the first and second terminals of the light component by switching the tenth transistor M3 and the eleventh transistor M4 through in a time-multiplexed manner.

[0052] For example, if the tenth transistor M3 is switched on, the second terminal of the light component is connected to the supply voltage VDD; if, on the other hand, the eleventh transistor M4 is switched on, the second terminal of the light component is connected to the second ground AGND.

[0053] By simultaneously switching on the ninth transistor M2 and the tenth transistor M3, the path indicated by N2 can be formed. By simultaneously switching on the eighth transistor M1 and the eleventh transistor M4, the path indicated by N1 can be formed. Consequently, any two illumination processes of the light source can exhibit different color temperatures.

[0054] In particular, interfaces J1 and J2 are arranged along the path between the first selector switch 110 and the second selector switch 120. These interfaces J1 and J2 can be connected to the lighting component and thus supply the lighting component with electrical driver signals.

[0055] In some embodiments, the structure of the driver circuit can be further extended to further increase the drive stability of the driver circuit.

[0056] With reference to Fig. 2 to 6, the driver circuit also includes one or more of the following components: A first filter circuit 230 and a second filter circuit 240,

[0057] By arranging the first filter circuit 230 and the second filter circuit 240, it is possible to filter out noise and improve the drive quality of the first driver signal and the third driver signal.

[0058] Examples include, with reference to Fig. 2 the first filter circuit 230 a first capacitor C11 and a sixth resistor R14, wherein the first terminal of the first capacitor C11 is coupled to the first terminal of the sixth resistor R14 and receives the supply voltage VDD; The second terminal of the first capacitor C11 is coupled to the second terminal of the sixth resistor R14, the first driver circuit 140 and the first selector circuit 110.

[0059] The second filter circuit 240 has the same structure as the first filter circuit 230. The second filter circuit 240 is coupled to the third driver circuit 160 and the second selector circuit 120.

[0060] For example, the second filter circuit comprises 240 with reference to Fig. 3 a first filter capacitor C21 and a first filter resistor R24.

[0061] A first current limiting circuit and a second current limiting circuit.

[0062] With reference to Fig. 2 includes the first current limiting circuit: a seventh resistor R15, wherein the first terminal of the seventh resistor R15 is coupled to the first driver circuit 140 and the second terminal of the seventh resistor R15 is coupled to the first selector circuit 110.

[0063] The second current limiting circuit has the same structure as the first current limiting circuit. The second current limiting circuit is coupled between the third driver circuit 160 and the second selector circuit 120.

[0064] With reference to Fig. 3 includes the second current limiting circuit: a first current limiting resistor R25.

[0065] A third filter circuit 250 and a fourth filter circuit 260, by the arrangement of the third filter circuit 250 and the fourth filter circuit 260 it is possible to filter out noise and improve the drive quality of the second driver signal and the fourth driver signal.

[0066] With reference to Fig. 4 comprises the third filter circuit 250: a second capacitor C41, an eighth resistor R43 and a ninth resistor R44, wherein the first terminal of the second capacitor C41 is coupled to the first terminal of the eighth resistor R43 and is connected to the second ground AGND; the second terminal of the second capacitor C41 is coupled to the second terminal of the eighth resistor R43, the second driver circuit 150 and the first terminal of the ninth resistor R44; the second terminal of the ninth resistor R44 is coupled to the first selector circuit 110.

[0067] Since the ninth resistor R44 is arranged, which is coupled to the first selector circuit 110, the ninth resistor R44 can act as a buffer and thus improve the operational reliability and stability of the first selector circuit 110.

[0068] Accordingly, the fourth filter circuit comprises 260 with reference to Fig. 5 a second filter capacitor C31, a second filter resistor R33 and a fourth filter resistor R34, the fourth filter resistor R34 being coupled to the second selector circuit 120.

[0069] Further details regarding the fourth filter circuit 260 can be found in the description below. Fig. 4 regarding the third filter circuit 250 can be taken from the diagram.

[0070] A third current limiting circuit 270 and a fourth current limiting circuit 280. The third current limiting circuit 270 comprises: a tenth resistor R44 and an eleventh resistor R45, wherein the first terminal of the tenth resistor R44 and the first terminal of the eleventh resistor R45 are coupled together and receive the supply voltage VDD, the second terminals of the tenth resistor R44 and the eleventh resistor R45 are coupled to the second driver circuit 150.

[0071] The fourth current limiting circuit 280 has the same structure as the third current limiting circuit 270, and the fourth current limiting circuit 280 is coupled to the fourth driver circuit 170.

[0072] For example, the fourth current limiting circuit 280 includes a second current limiting resistor R34 and a third current limiting resistor R35.

[0073] A fifth filter circuit, which refers to Fig. 6 is coupled to the first selector circuit 110 and to the first connection of the lighting component. The fifth filter circuit comprises: a third capacitor C1 and a twelfth resistor R1.

[0074] The first terminal of the third capacitor C1 is coupled to the first selector circuit 110 and to the first terminal of the lighting component, while the second terminal of the third capacitor C1 is coupled to the twelfth resistor R1; the second terminal of the twelfth resistor R1 is connected to the first ground GND.

[0075] A sixth filter circuit is coupled to both the second selector circuit 120 and the second terminal of the lighting component. This sixth filter circuit comprises a fourth capacitor C2 and a thirteenth resistor R2. The first terminal of the fourth capacitor C2 is coupled to both the second selector circuit 120 and the second terminal of the lighting component, while the second terminal of the fourth capacitor C2 is coupled to the thirteenth resistor R2. The second terminal of the thirteenth resistor R2 is connected to the first ground (GND).

[0076] And a fifth current limiting circuit, wherein the fifth current limiting circuit comprises: a fourteenth resistor R3 coupled between the first selector circuit 110 and the second selector circuit 120.

[0077] By arranging the filter circuits and a current limiting circuit at the output terminals of the first selector circuit 110 and the second selector circuit 120, the stability of the first driver signal and the second driver signal is increased, which is helpful for increasing the stability of the lighting light.

[0078] In some embodiments, the first driver signal and / or the second driver signal can also be detected to determine whether the first driver signal or the second driver signal currently meets the lighting requirements.

[0079] For example, the driver circuit further comprises: a detection circuit coupled to the first selector circuit, the second selector circuit, and the control circuit, and configured to detect a driver current when the first selector circuit and / or the second selector circuit is selected and switched on, convert the driver current into a detection voltage, and output this voltage to the control circuit; a control circuit further configured to generate a third control signal based on the detection voltage and a first preset voltage threshold, the third control signal being used to control whether the first control signal and / or the second control signal is output.

[0080] In some embodiments, when the light component is illuminated, a detection voltage corresponding to the driver current can be detected. The control circuit can then generate a third control signal based on this detection voltage and a previously set first preset voltage threshold. This third control signal allows the state of the light component to be determined. Consequently, the light component's state can be adjusted according to this third control signal.

[0081] For example, if the difference between the detection voltage and the first preset voltage threshold is within the specified threshold range, this means that the light intensity provided by the luminous component meets the requirements and the current lighting state is maintained.

[0082] If the difference between the detection voltage and the first preset voltage threshold is outside the specified threshold range, the transmission of the first control signal and / or the second control signal via the third control signal is interrupted, and the lighting component does not light up.

[0083] With reference to the in Fig. Figure 7, a schematic structural representation of a detection circuit according to an embodiment of the present application, can be used to describe the detection circuit as shown in Fig. 7 shown, includes the following: A converter circuit 710 configured to convert the driver current into an initial detection voltage; A gain amplifier circuit 720 coupled to the converter circuit 710 and configured to amplify the initial detection voltage to generate the detection voltage; The converter circuit 710 comprises: a fifteenth resistor R71 and a sixteenth resistor R72, wherein the first terminal of the fifteenth resistor R71 is coupled to the first terminal of the sixteenth resistor R72 and is each coupled to the first selector circuit 110 and the second selector circuit 120, and the second terminal of the fifteenth resistor R71 and the second terminal of the sixteenth resistor R72 are connected to the first ground GND.

[0084] This means that, using the conversion function of the fifteenth resistor R71 and the sixteenth resistor R72, the driver current is converted into the initial detection voltage.

[0085] The amplification circuit 720 comprises: an operational amplifier 722 and a feedback branch 724, wherein the first input terminal and the second terminal of the operational amplifier 722 are coupled to the converter circuit 710 and the output terminal of the operational amplifier 722 is coupled to the control circuit 130.

[0086] The feedback branch 724 comprises: a seventeenth resistor R77 and an eighteenth resistor R76, wherein the first terminal of the seventeenth resistor R77 is coupled to the output terminal of the operational amplifier 722, the second terminal of the seventeenth resistor R77 is coupled to the first terminal of the eighteenth resistor R76 and to the second terminal of the operational amplifier 722; the second terminal of the eighteenth resistor R76 is connected to the first ground GND.

[0087] In some optional examples, the detection circuit may further include the following: A nineteenth resistor R73, which is coupled between the fifteenth resistor R71 and the first terminal of the operational amplifier 722.

[0088] A twentieth resistor R74, which is coupled between the fifteenth resistor R71 and the second terminal of the operational amplifier 722.

[0089] A fifth capacitor C72, which is coupled between the first terminal and the second terminal of the operational amplifier 722.

[0090] Accordingly, the feedback branch 724 may further include: a sixth capacitor C74 coupled to the seventeenth resistor R77, and a seventh capacitor C73 coupled to the eighteenth resistor R76.

[0091] An eighth capacitor C71 and a twenty-first resistor R75, which serve for filtering and are coupled to the first terminal of the operational amplifier 722, wherein the first terminals of the eighth capacitor C71 and the twenty-first resistor R75 are connected to the first ground GND, and the second terminals of the eighth capacitor C71 and the twenty-first resistor R75 are both coupled to the first terminal of the operational amplifier 722.

[0092] A ninth capacitor C75, a twenty-second resistor R78, and a twenty-third resistor R79, which serve for filtering and are coupled to the output terminal of the operational amplifier 722, wherein the first terminal of the twenty-second resistor R78 is coupled to the output terminal of the operational amplifier 722, the second terminal of the twenty-second resistor R78 is coupled to the first terminals of the twenty-third resistor R79, the ninth capacitor C75, and the control circuit 130; the second terminals of the ninth capacitor C75 and the twenty-third resistor R79 are connected to the first ground GND.

[0093] In this embodiment, the control circuit can be a controller capable of outputting PWM signals. For example, the control circuit could be a microcontroller (MCU).

[0094] In some embodiments, the lighting component comprises a first lighting branch and a second lighting branch, wherein the first lighting branch and the second lighting branch have different conduction paths.

[0095] The term "conduction path" refers to the direction of current flow when the lighting component is activated. Different conduction paths mean that the first and second lighting branches are activated by currents flowing in opposite directions.

[0096] Accordingly, the first lighting branch and the second lighting branch light up alternately in response to the first control signal and the second control signal, with temporal multiplexing.

[0097] Specifically, the first lighting branch is illuminated by the output time sequence of the first and second control signals. Before the planned reversal, the lighting component is extinguished by configuring the level state of the first and second control signals (e.g., to the low level "0") – it is then in the "dead zone". At a subsequent time, the second lighting branch is illuminated by again changing the level state of the first and second control signals. By utilizing the afterimage effect of the human eye, a rapid change between two color temperatures can thus be achieved.

[0098] Although the embodiments of the present invention are disclosed as above, the invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention is determined by the scope defined in the claims.

Claims

[1] Driver circuit, characterized by that it includes the following: a first selector circuit (110) which is coupled to the first connection of a lighting component; a second selector circuit (120) which is coupled to the second terminal of the lighting component; a control circuit (130) wherein its first output terminal is configured to output a first control signal, and its second output terminal is configured to output a second control signal, wherein the first control signal and the second control signal are multiplexed in time; a first driver circuit (140) and a second driver circuit (150) coupled to the first selector circuit (110), and a third driver circuit (160) and a fourth driver circuit (170) coupled to the second selector circuit (120); in response to the first control signal, the first driver circuit (140) coupled to the first output terminal activates the first selector circuit (110) so that the first terminal of the light component is coupled to the supply voltage, and the fourth driver circuit (170) coupled to the first output terminal activates the second selector circuit (120) so that the second terminal of the light component is coupled to ground;In response to the second control signal, the third driver circuit (160) coupled to a second output terminal activates a second selector circuit (120) so that the second terminal of the lighting component is coupled to the supply voltage, and the second driver circuit (150) coupled to the second output terminal activates the first selector circuit (110) so that the first terminal of the lighting component is coupled to ground. [2] Driver circuit according to claim 1, characterized by , that the first driver circuit (140) comprises the following: a switching circuit (210) which is coupled to the first output terminal and is configured to output a first initial driver signal depending on the supply voltage when switched on in response to the first control signal; a first amplifier circuit (220) which is coupled to the switch circuit (210) and to the first selector circuit (110) and is configured to amplify the first initial driver signal in order to generate a first driver signal which is then output to the first selector circuit (110); wherein the third driver circuit (160) has the same structure as the first driver circuit (140), the switch circuit (210) in the third driver circuit (160) is coupled to the second output terminal, and the first amplifier circuit (220) is coupled to the second selector circuit (120) to generate a second driver signal which is then output to the second selector circuit (120). [3] Driver circuit according to claim 2, characterized by , that the switch circuit (210) comprises the following: a first voltage divider branch and a switch branch, wherein the first voltage divider branch comprises: a first resistor (R11) and a second resistor (R12), wherein the first terminal of the first resistor (R11) is coupled to the first terminal of the second resistor (R12) and to the first output terminal, while the second terminal of the first resistor (R11) is connected to the first ground; the second terminal of the second resistor (R12) is coupled to the switch branch; the switch branch comprises a first transistor (M11) and a third resistor (R13), wherein the control terminal of the first transistor (M11) is coupled to the first voltage divider branch, the first terminal of the first transistor (M11) is coupled to the first terminal of the third resistor (R13) and to the first amplifier circuit (220), and the second terminal of the first transistor (M11) is connected to the first ground;the second terminal of the third resistor (R13) receives the supply voltage; the first amplifier circuit (220) comprises: a first totem pole, wherein the first totem pole comprises: a second transistor (M12) and a third transistor (M13), the control terminal of the second transistor (M12) each connected to the control terminal of the third transistor (M13) and coupled to the switch circuit (210), the first terminal of the second transistor (M12) is connected to the first ground, while the second terminal of the second transistor (M12) is coupled to the second terminal of the third transistor (M13) and the first selector circuit (110); the first terminal of the third transistor (M13) receives the supply voltage. [4] Driver circuit according to claim 2, characterized by , that the second driver circuit (150) comprises the following: a push-pull circuit (310) which is coupled to the second output terminal and is configured to output a second initial driver signal depending on the supply voltage when switched on in response to the second control signal; a second amplifier circuit (320) which is coupled to the push-pull circuit (310) and to the first selector circuit (110) and is configured to amplify the second initial driver signal in order to generate a third driver signal which is then output to the first selector circuit (110); wherein the fourth driver circuit (170) has the same structure as the second driver circuit (150), the push-pull circuit (310) in the fourth driver circuit (170) is coupled to the first output terminal, and the second amplifier circuit (320) is coupled to the second selector circuit (120) to generate a fourth driver signal which is then output to the second selector circuit (120). [5] Driver circuit according to claim 4, characterized by, that the push-pull circuit (310) comprises: a second voltage divider branch and a push-pull branch, wherein the second voltage divider branch comprises: a fourth resistor (R41) and a fifth resistor (R42), the first terminal of the fourth resistor (R41) being coupled to the second output terminal and to the first terminal of the fifth resistor (R42), while the second terminal of the fourth resistor (R41) is connected to the first ground; the second terminal of the fifth resistor (R42) is coupled to the push-pull branch;The push-pull branch comprises: a fourth transistor (M41) and a fifth transistor (M42), wherein the control terminal of the fourth transistor (M41) is coupled to the second voltage divider branch, the first terminal of the fourth transistor (M41) is coupled to the control terminal of the fifth transistor (M42) and receives the supply voltage, the second terminals of the fourth transistor (M41) and the fifth transistor (M42) are connected to the first ground; the first terminal of the fifth transistor (M42) is coupled to the second amplifier circuit (320); the second amplifier circuit (320) comprises a second totem pole, the second totem pole comprising: a sixth transistor (M43) and a seventh transistor (M44), the control terminal of the sixth transistor (M43) being coupled to the control terminal of the seventh transistor (M44) and to the push-pull circuit (310), the first terminal of the sixth transistor (M43) being connected to the first ground, while the second terminal of the sixth transistor (M43) being coupled to the second terminal of the seventh transistor (M44) and to the first selector circuit (110); the first terminal of the seventh transistor (M44) receiving the supply voltage. [6] Driver circuit according to claim 1, characterized by, that the first selector circuit (110) comprises: a first half-bridge branch formed by the eighth transistor and the ninth transistor, wherein the control terminal of the eighth transistor is coupled to the first driver circuit (140), the first terminal of the eighth transistor receives the supply voltage, the second terminal of the eighth transistor is coupled to the second terminal of the ninth transistor and further coupled to the first terminal of the illuminating component; the control terminal of the ninth transistor is coupled to the second driver circuit (150), while the first terminal of the ninth transistor is coupled to the second ground; The second selector circuit (120) comprises: a second half-bridge branch formed by the tenth transistor and the eleventh transistor, wherein the control terminal of the tenth transistor is coupled to the third driver circuit (160), the first terminal of the tenth transistor receives the supply voltage, the second terminal of the tenth transistor is coupled to the second terminal of the eleventh transistor and further coupled to the second terminal of the luminous component; the control terminal of the eleventh transistor is coupled to the fourth driver circuit (170), while the first terminal of the eleventh transistor is connected to the second ground. [7] Driver circuit according to claim 1, characterized by , that the driver circuit further comprises one or more of the following components: a first filter circuit (230) and a second filter circuit (240), wherein the first filter circuit (230) comprises a first capacitor (C11) and a sixth resistor (R14), the first terminal of the first capacitor (C11) is coupled to the first terminal of the sixth resistor (R14) and receives the supply voltage; the second terminal of the first capacitor (C11) is coupled to the second terminal of the sixth resistor (R14), the first driver circuit (140) and the first selector circuit (110) respectively; the second filter circuit (240) has the same structure as the first filter circuit (230), the second filter circuit (240) is coupled to the third driver circuit (160) and the second selector circuit (120) respectively; a first current limiting circuit and a second current limiting circuit, wherein the first current limiting circuit comprises: a seventh resistor, wherein the first terminal of the seventh resistor is coupled to the first driver circuit (140) and the second terminal of the seventh resistor is coupled to the first selector circuit (110); the second current limiting circuit has the same structure as the first current limiting circuit, the second current limiting circuit being coupled between the third driver circuit (160) and the second selector circuit (120); a third filter circuit (250) and a fourth filter circuit (260), wherein the third filter circuit (250) comprises: a second capacitor (C41), an eighth resistor (R43) and a ninth resistor (R44), wherein the first terminal of the second capacitor (C41) is coupled to the first terminal of the eighth resistor (R43) and is connected to the second ground; the second terminal of the second capacitor (C41) is coupled to the second terminal of the eighth resistor (R43), the second driver circuit (150) and the first terminal of the ninth resistor (R44); the second terminal of the ninth resistor (R44) is coupled to the first selector circuit (110); the fourth filter circuit (260) has the same construction as the third filter circuit (250), and the fourth filter circuit (260) is coupled between the fourth driver circuit (170) and the second selector circuit (120); a third current limiting circuit (270) and a fourth current limiting circuit (280), wherein the third current limiting circuit (270) comprises: a tenth resistor (R44) and an eleventh resistor (R45), wherein the first terminal of the tenth resistor (R44) and the first terminal of the eleventh resistor (R45) are coupled together and receive the supply voltage, the second terminals of the tenth resistor (R44) and the eleventh resistor (R45) are coupled to the second driver circuit (150); the fourth current limiting circuit (280) has the same structure as the third current limiting circuit (270) and the fourth current limiting circuit (280) is coupled to the fourth driver circuit (170); a fifth filter circuit, which is coupled to the first selector circuit (110) and to the first terminal of the illuminating component, the fifth filter circuit comprising: a third capacitor (C1) and a twelfth resistor (R1), the first terminal of the third capacitor (C1) being coupled to the first selector circuit (110) and to the first terminal of the illuminating component, while the second terminal of the third capacitor (C1) being coupled to the twelfth resistor (R1); the second terminal of the twelfth resistor (R1) being connected to ground; a sixth filter circuit, which is coupled to the second selector circuit (120) and to the second terminal of the illuminating component, wherein the sixth filter circuit comprises: a fourth capacitor (C2) and a thirteenth resistor (R2), the first terminal of the fourth capacitor (C2) being coupled to the second selector circuit (120) and to the second terminal of the illuminating component, while the second terminal of the fourth capacitor (C2) being coupled to the thirteenth resistor (R2); the second terminal of the thirteenth resistor (R2) being connected to ground; a fifth current limiting circuit, wherein the fifth current limiting circuit comprises: a fourteenth resistor (R3) that is coupled between the first selector circuit (110) and the second selector circuit (120). [8] Driver circuit according to claim 1, characterized by , that it further includes the following: a detection circuit which is coupled to the first selector circuit (120), the second selector circuit and the control circuit (130) and is configured to detect a driver current when the first selector circuit (120) and / or the second selector circuit is selected and switched on, converts the driver current into a detection voltage and outputs this to the control circuit (130); a control circuit (130) which is further configured to generate a third control signal based on the detection voltage and a first preset voltage threshold, wherein the third control signal serves to control whether the first control signal and / or the second control signal is output. [9] Driver circuit according to claim 8, characterized by , that the detection circuit further includes the following: a converter circuit (710) configured to convert the driver current into an initial detection voltage; an amplification circuit (720) coupled to the converter circuit (710) and configured to amplify the initial detection voltage to generate the detection voltage; wherein the converter circuit (710) comprises a fifteenth resistor (R71) and a sixteenth resistor (R72), the first terminal of the fifteenth resistor (R71) is coupled to the first terminal of the sixteenth resistor (R72) and is each coupled to the first selector circuit (120) and the second selector circuit, and the second terminal of the fifteenth resistor (R71) and the second terminal of the sixteenth resistor (R72) are connected to the first ground; The amplification circuit (720) comprises: an operational amplifier (722) and a feedback branch (724), wherein the first input terminal and the second terminal of the operational amplifier (722) are coupled to the converter circuit (710) and the output terminal of the operational amplifier (722) is coupled to the control circuit (130); the feedback branch (724) comprises: a seventeenth resistor (R77) and an eighteenth resistor (R76), the first terminal of the seventeenth resistor (R77) is coupled to the output terminal of the operational amplifier (722), the second terminal of the seventeenth resistor (R77) is coupled to the first terminal of the eighteenth resistor (R76) and to the second terminal of the operational amplifier (722); the second terminal of the eighteenth resistor (R76) is connected to the first ground. [10] Driver circuit according to claim 1, characterized by, that the luminous component has a first luminous branch and a second luminous branch, wherein the first luminous branch and the second luminous branch have different conduction paths; In response to the first control signal and the second control signal, the first lighting branch and the second lighting branch light up alternately in a time-multiplied manner.

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