Driving circuit and lighting circuit

Abstract

The application provides a driving circuit and a lighting circuit. The driving circuit comprises: a first gating circuit coupled with a first end of a light-emitting component; a second gating circuit coupled with a second end of the light-emitting component; a control circuit, a first output end of the control circuit is configured to output a first control signal, and a second output end of the control circuit is configured to output a second control signal; a first driving circuit and a second driving circuit coupled with the first gating circuit, and a third driving circuit and a fourth driving circuit coupled with the second gating circuit; in response to the first control signal, the first driving circuit enables the first gating circuit, so that the first end of the light-emitting component is coupled with a power supply voltage, and the fourth driving circuit enables the second gating circuit, so that the second end of the light-emitting component is coupled with a ground; in response to the second control signal, the third driving circuit enables the second gating circuit, so that the second end of the light-emitting component is coupled with the power supply voltage. By using the technical scheme, the color temperature can be changed rapidly.

Description

Technical Field

[0001] This application relates to the field of lighting technology, and in particular to a driving circuit and a lighting circuit. Background Technology

[0002] With the development of lighting technology, traditional lamps can no longer meet people's needs. Light-emitting diodes (LEDs) have advantages such as high conversion efficiency, high color rendering, and dimming capability, and are widely used in various lighting scenarios.

[0003] In practical applications, arrays of single-row LEDs, multi-row LEDs, and / or multi-column LEDs are used to generate appropriate light and provide sufficient brightness. However, when using multi-row and multi-column LEDs, the LED emission sequence needs to be set to produce light with varying brightness.

[0004] However, the existing driving solutions still need improvement. Utility Model Content

[0005] In view of this, this application provides a driving circuit and a lighting circuit that can achieve rapid color temperature changes and improve user experience.

[0006] In a first aspect, this application provides a driving circuit, comprising: The first gating circuit is coupled to the first end of the light-emitting component; The second gating circuit is coupled to the second terminal of the light-emitting 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 output in a time-division manner; A first driving circuit and a second driving circuit coupled to the first gating circuit, and a third driving circuit and a fourth driving circuit coupled to the second gating circuit; in response to the first control signal, the first driving circuit coupled to the first output terminal enables the first gating circuit, such that the first end of the light-emitting component is coupled to the power supply voltage, and the fourth driving circuit coupled to the first output terminal enables the second gating circuit, such that the second end of the light-emitting component is coupled to ground; in response to the second control signal, the third driving circuit coupled to the second output terminal enables the second gating circuit, such that the second end of the light-emitting component is coupled to the power supply voltage, and the second driving circuit coupled to the second output terminal enables the first gating circuit, such that the first end of the light-emitting component is coupled to ground.

[0007] Optionally, the first driving circuit includes: A switching circuit, coupled to the first output terminal, is configured to output a first initial drive signal according to the power supply voltage in response to the first control signal being turned on. The first amplification circuit, coupled to the switching circuit and the first gating circuit respectively, is configured to amplify the first initial driving signal, generate the first driving signal, and output it to the first gating circuit. The third driving circuit has the same structure as the first driving circuit. The switching circuit in the third driving circuit is coupled to the second output terminal, and the first amplification circuit is coupled to the second gating circuit to generate a second driving signal and output it to the second gating circuit.

[0008] Optionally, the switching circuit includes: A first voltage divider branch and a switching branch, wherein the first voltage divider branch includes: a first resistor and a second resistor, the first end of the first resistor being coupled to the first end of the second resistor and the first output terminal, and the second end of the first resistor being connected to a first ground; the second end of the second resistor is coupled to the switching branch; the switching branch includes a first transistor and a third resistor, the control terminal of the first transistor being coupled to the first voltage divider branch, the first end of the first transistor being coupled to the first end of the third resistor and the first amplifier circuit, and the second end of the first transistor being connected to a first ground; the second end of the third resistor receives the power supply voltage. The first amplifier circuit includes: a first totem pole, the first totem pole including: a second transistor and a third transistor, the control terminal of the second transistor being coupled to the control terminal of the third transistor and the switching circuit respectively, the first terminal of the second transistor being connected to a first ground, the second terminal of the second transistor being coupled to the second terminal of the third transistor and the first gating circuit respectively; the first terminal of the third transistor is input with the power supply voltage.

[0009] Optionally, the second driving circuit includes: A push-pull circuit, coupled to the second output terminal, is configured to output a second initial drive signal according to the power supply voltage in response to the second control signal being turned on. The second amplification circuit, coupled to the push-pull circuit and the first gating circuit respectively, is configured to amplify the second initial driving signal, generate a third driving signal, and output it to the first gating circuit. The fourth driving circuit has the same structure as the second driving circuit. The push-pull circuit in the fourth driving circuit is coupled to the first output terminal, and the second amplification circuit is coupled to the second gating circuit. It is used to generate a fourth driving signal and output it to the second gating circuit.

[0010] Optionally, the push-pull circuit includes: a second voltage divider branch and a push-pull branch, wherein the second voltage divider branch includes: a fourth resistor and a fifth resistor, the first end of the fourth resistor is coupled to the second output terminal and the first end of the fifth resistor respectively, and the second end of the fourth resistor is connected to a first ground; the second end of the fifth resistor is coupled to the push-pull branch; the push-pull branch includes: a fourth transistor and a fifth transistor, the control terminal of the fourth transistor is coupled to the second voltage divider branch, the first end of the fourth transistor is coupled to the control terminal of the fifth transistor and inputs the power supply voltage, the second ends of the fourth transistor and the fifth transistor are connected to the first ground; the first end of the fifth transistor is coupled to the second amplifier circuit; The second amplifier circuit includes a second totem pole, which includes a sixth transistor and a seventh transistor. The control terminal of the sixth transistor is coupled to the control terminal of the seventh transistor and the push-pull circuit. The first terminal of the sixth transistor is connected to a first ground, and the second terminal of the sixth transistor is coupled to the second terminal of the seventh transistor and the first gating circuit. The first terminal of the seventh transistor receives the power supply voltage.

[0011] Optionally, the first selection circuit includes: a first half-bridge branch composed of an eighth transistor and a ninth transistor, wherein the control terminal of the eighth transistor is coupled to the first driving circuit, the first terminal of the eighth transistor is input to the power supply voltage, the second terminal of the eighth transistor is coupled to the second terminal of the ninth transistor, and coupled to the first terminal of the light-emitting component; the control terminal of the ninth transistor is coupled to the second driving circuit, and the first terminal of the ninth transistor is coupled to a second ground; The second selection circuit includes: a second half-bridge branch composed of a tenth transistor and an eleventh transistor, wherein the control terminal of the tenth transistor is coupled to the third driving circuit, the first terminal of the tenth transistor is input with the power supply voltage, the second terminal of the tenth transistor is coupled to the second terminal of the eleventh transistor and coupled to the second terminal of the light-emitting component; the control terminal of the eleventh transistor is coupled to the fourth driving circuit, and the first terminal of the eleventh transistor is connected to a second ground.

[0012] Optionally, the driving circuit further includes one or more of the following: A first filter circuit and a second filter circuit. The first filter circuit includes a first capacitor and a sixth resistor. A first terminal of the first capacitor is coupled to a first terminal of the sixth resistor and is input with the power supply voltage. A second terminal of the first capacitor is coupled to a second terminal of the sixth resistor, a first driving circuit, and a first gating circuit. The second filter circuit has the same structure as the first filter circuit. The second filter circuit is coupled to a third driving circuit and a second gating circuit. A first current limiting circuit and a second current limiting circuit, wherein the first current limiting circuit includes a seventh resistor, a first end of which is coupled to the first driving circuit, and a second end of which is coupled to the first gating circuit; the second current limiting circuit and the first current limiting circuit have the same structure, and the second current limiting circuit is coupled between the third driving circuit and the second gating circuit. A third filter circuit and a fourth filter circuit are provided. The third filter circuit includes a second capacitor, an eighth resistor, and a ninth resistor. The first terminal of the second capacitor is coupled to the first terminal of the eighth resistor and connected to a second ground. The second terminal of the second capacitor is coupled to the second terminal of the eighth resistor, the second driving circuit, and the first terminal of the ninth resistor, respectively. The second terminal of the ninth resistor is coupled to the first gating circuit. The fourth filter circuit has the same structure as the third filter circuit and is coupled between the fourth driving circuit and the second gating circuit. The third current limiting circuit and the fourth current limiting circuit, wherein the third current limiting circuit includes a tenth resistor and an eleventh resistor, the first end of the tenth resistor and the first end of the eleventh resistor are coupled together and the power supply voltage is input, and the second ends of the tenth resistor and the eleventh resistor are coupled together with the second driving circuit; the fourth current limiting circuit and the third current limiting circuit have the same structure, and the fourth current limiting circuit is coupled together with the fourth driving circuit. A fifth filtering circuit is coupled to the first gating circuit and the first terminal of the light-emitting component, respectively. The fifth filtering circuit includes a third capacitor and a twelfth resistor. The first terminal of the third capacitor is coupled to the first terminal of the first gating circuit and the first terminal of the light-emitting component, respectively. The second terminal of the third capacitor is coupled to the twelfth resistor. The second terminal of the twelfth resistor is grounded. A sixth filter circuit is coupled to the second gating circuit and the second terminal of the light-emitting component, respectively. The sixth filter circuit includes a fourth capacitor and a thirteenth resistor. The first terminal of the fourth capacitor is coupled to the second gating circuit and the second terminal of the light-emitting component, respectively. The second terminal of the fourth capacitor is coupled to the thirteenth resistor. The second terminal of the thirteenth resistor is grounded. The fifth current limiting circuit includes a fourteenth resistor coupled between the first gating circuit and the second gating circuit.

[0013] Optionally, the drive circuit further includes: The detection circuit is coupled to the first gating circuit, the second gating circuit and the control circuit respectively, and is configured to acquire the drive current when the first gating circuit and / or the second gating circuit is selected, and convert the drive current into a detection voltage and output it to the control circuit. The control circuit is further configured to generate a third control signal based on the detected voltage and a first preset voltage threshold, the third control signal being used to control whether to output the first control signal and / or the second control signal.

[0014] Optionally, the detection circuit includes: A conversion circuit is configured to convert the drive current into an initial detection voltage; A gain circuit, coupled to the conversion circuit, is configured to amplify the initial detection voltage to generate the detection voltage; The switching circuit includes a fifteenth resistor and a sixteenth resistor. The first end of the fifteenth resistor is coupled to the first end of the sixteenth resistor and is also coupled to the first gating circuit and the second gating circuit, respectively. The second end of the fifteenth resistor and the second end of the sixteenth resistor are connected to a first ground. The gain circuit includes an operational amplifier and a feedback branch. The first input terminal and the second terminal of the operational amplifier are coupled to the conversion circuit, and the output terminal of the operational amplifier is coupled to the control circuit. The feedback branch includes a seventeenth resistor and an eighteenth resistor. The first terminal of the seventeenth resistor is coupled to the output terminal of the operational amplifier, and the second terminal of the seventeenth resistor is coupled to the first terminal of the eighteenth resistor and the second terminal of the operational amplifier, respectively. The second terminal of the eighteenth resistor is connected to a first ground.

[0015] Secondly, this application provides a lighting circuit, comprising: The drive circuit as described in any of the preceding items; The light-emitting component is coupled to the driving circuit. The light-emitting component has a first light-emitting branch and a second light-emitting branch, and the first light-emitting branch and the second light-emitting branch emit light in a time-division manner.

[0016] Compared with the prior art, the technical solution of this application has the following advantages: In the driving circuit provided in this application, the control circuit can output a first control signal and a second control signal in a time-division manner, thereby enabling time-division selection of paired first and fourth driving circuits, as well as paired second and third driving circuits, to select different conduction paths, causing the light-emitting components to emit light in different light-emitting modes. In other words, by configuring the interval between the first and second control signals, the light-emitting interval of the light-emitting components on different conduction paths can be shortened, achieving rapid color temperature changes and improving the user experience. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a driving circuit in an embodiment of this application; Figure 2 This is a partial structural schematic diagram of the first driving circuit in the embodiments of this application; Figure 3 This is a partial structural diagram of the second type of driving circuit in the embodiments of this application; Figure 4 This is a partial structural diagram of the third driving circuit in the embodiments of this application; Figure 5 This is a partial structural diagram of the fourth driving circuit in the embodiments of this application; Figure 6 This is a partial structural schematic diagram of the fifth driving circuit in the embodiments of this application; Figure 7 This is a schematic diagram of the structure of a detection circuit in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of a lighting circuit in an embodiment of this application. Detailed Implementation

[0018] Various embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0019] In lighting schemes employing multiple rows and / or columns of LEDs, the LEDs exhibit different luminous states under different conduction paths. For example, an LED may have a first luminous state and a second luminous state.

[0020] Currently, inverters are typically used to control the timing of LED light emission, allowing the LEDs to switch between a first and a second emission state. However, this switching process can burn out the inverter. Furthermore, this approach can only control one LED circuit at a time and cannot perform asynchronous control.

[0021] To address the aforementioned technical problems, this application provides a driving circuit. The control circuit can output a first control signal and a second control signal in a time-division multiplexing manner, thereby enabling time-division multiplexing of paired first and fourth driving circuits, as well as paired second and third driving circuits, selecting different conduction paths and causing the light-emitting components to emit light in different light-emitting modes. In other words, by configuring the interval between the first and second control signals, the light-emitting interval of the light-emitting components on different conduction paths can be shortened, achieving rapid color temperature changes and improving the user experience.

[0022] To enable those skilled in the art to better understand and implement this disclosure, the following detailed description of the specific solutions, principles, advantages, and effects of this application is provided with reference to the accompanying drawings and specific embodiments.

[0023] See Figure 1 The schematic diagram shown in this application illustrates the structure of a driving circuit in one embodiment. Figure 1 As shown, the driving circuit is coupled to the light-emitting component and is used to drive the light-emitting component to emit light.

[0024] The driving circuit may include: The first gating circuit 110 is coupled to the first end of the light-emitting component; The second gating circuit 120 is coupled to the second end of the light-emitting component; The control circuit 130 has a first output terminal configured to output a first control signal and a second output terminal configured to output a second control signal, wherein the first control signal and the second control signal are output in a time-division manner. A first driving circuit 140 and a second driving circuit 150 are coupled to the first gating circuit 110, and a third driving circuit 160 and a fourth driving circuit 170 are coupled to the second gating circuit 120. In response to a first control signal, the first driving circuit 140, coupled to the first output terminal, enables the first gating circuit 110, causing the first end of the light-emitting component to be coupled to the power supply voltage VDD; and the fourth driving circuit 170, coupled to the first output terminal, enables the second gating circuit 120, causing the second end of the light-emitting component to be coupled to ground. In response to a second control signal, the third driving circuit 160, coupled to the second output terminal, enables the second gating circuit 120, causing the second end of the light-emitting component to be coupled to the power supply voltage VDD; and the second driving circuit 150, coupled to the second output terminal, enables the first gating circuit 110, causing the first end of the light-emitting component to be coupled to ground.

[0025] If at the current moment, the control circuit 130 outputs the first control signal, that is, the first control signal is a high level "1", then in response to the first control signal, both the first drive circuit 140 and the fourth drive circuit 170 are turned on.

[0026] When the first driving circuit 140 is turned on, the first gating circuit 110 is also turned on, thereby enabling the path from the power supply voltage VDD to the first terminal of the light-emitting component. At the same time, when the fourth driving circuit 170 is turned on, the second gating circuit 120 is also turned on, thereby enabling the path from the second terminal of the light-emitting component to ground, and the light-emitting component has a first emitting state.

[0027] At the next moment, the control circuit 130 outputs a second control signal, that is, the second control signal is a high level "1". In response to the second control signal, the second driving circuit 150 and the third driving circuit 160 are both turned on, thereby selecting the path between the second end of the light-emitting component and the power supply voltage VDD, as well as the path between the first end of the light-emitting component and ground, and the light-emitting component has a second light-emitting state.

[0028] Thus, when light-emitting components with different color temperatures are set on different conduction paths, by configuring the interval between the first control signal and the second control signal (i.e., within this interval, the light-emitting component is in a "dead zone" and does not emit light), the light emission interval of the light-emitting components on different conduction paths can be shortened, achieving rapid changes in color temperature and improving the user experience.

[0029] It should be noted that, firstly, Figure 1 The illustrated connection relationship of the driving circuit is only for illustrative purposes and is used to show that by setting the first to fourth driving circuits, the color temperature of the light-emitting component can be changed under the action of the control circuit; secondly, the light-emitting component in this application includes multiple columns or rows of LEDs, and two columns or rows of LEDs have opposite conduction paths.

[0030] To better illustrate and understand the working principle and structure of the driving circuit in this application, the following examples will be used to explain them respectively.

[0031] In this application, the first driving circuit and the third driving circuit have the same structure, but in response to different control signals, the first driving circuit and the third driving circuit are turned on in a time-division manner to selectively turn on the first gating circuit and the second gating circuit, so that the first end and the second end of the light-emitting component have different potentials.

[0032] The following explanation uses the structure of the first driving circuit as an example.

[0033] In some embodiments, combined with Figure 1 See Figure 2 The schematic diagram of a partial structure of the first driving circuit in the embodiment of this application is shown below. Figure 2As shown, the first driving circuit 140 includes: a switching circuit 210 coupled to the first output terminal CW1, configured to output a first initial driving signal according to the power supply voltage VDD when the first control signal is turned on; and a first amplification circuit 220 coupled to the switching circuit 210 and the first gating circuit 110 respectively, configured to amplify the first initial driving signal to generate the first driving signal and output it to the first gating circuit 110.

[0034] The third driving circuit has the same structure as the first driving circuit. The switching circuit in the third driving circuit is coupled to the second output terminal, and the first amplifier circuit is coupled to the second gating circuit. It is used to generate the second driving signal and output it to the second gating circuit.

[0035] For example, the switching circuit 210 may include a first voltage divider branch and a switching branch. The first voltage divider branch is used to divide the first control signal, so that the divided signal can drive the switching branch to turn on the subsequent circuit. Furthermore, by setting up the voltage divider branch, a protective function can be provided to reduce the risk of damage to the switching branch due to an excessively large first control signal.

[0036] In some embodiments, the first voltage divider branch includes: a first resistor R11 and a second resistor R12, the first end of the first resistor R11 is coupled to the first end of the second resistor R12 and the first output terminal CW1 respectively, and the second end of the first resistor R11 is connected to the first ground GND; the second end of the second resistor R12 is coupled to the switch branch.

[0037] The switching branch includes a first transistor M11 and a third resistor R13. 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 the first amplifier circuit 220, respectively. The second terminal of the first transistor M11 is connected to the first ground GND. The second terminal of the third resistor R13 is input to the power supply voltage VDD.

[0038] Specifically, the control terminal of the first transistor M11 receives the first control signal, and under the action of the power supply voltage VDD, the first transistor M11 is turned on.

[0039] In some embodiments, the first amplifier circuit 220 includes a first totem pole. By employing a totem pole circuit, the current output and sinking capabilities of the drive circuit can be greatly improved, and the switching speed can be significantly accelerated.

[0040] For example, the first totem pole includes a second transistor M12 and a third transistor M13. The control terminal of the second transistor M12 is coupled to the control terminal of the third transistor M13 and the switching circuit 210, respectively. The first terminal of the second transistor M12 is connected to the first ground GND, and the second terminal of the second transistor M12 is coupled to the second terminal of the third transistor M13 and the first gating circuit 110, respectively. The first terminal of the third transistor M13 is input to the power supply voltage VDD.

[0041] Specifically, when the first transistor M11 is in the on state, the power supply voltage VDD can be applied to the control terminals of the second transistor M12 and the third transistor M13, so that the second transistor M12 and the third transistor M13 are in the on state, so as to amplify the first initial drive signal and generate the first drive signal.

[0042] Accordingly, combined Figure 1 and 2 See Figure 3 The schematic diagram of a partial structure of the second type of driving circuit in the embodiment of this application is shown. The third driving circuit 160 has the same structure as the first driving circuit 140, except that the third driving circuit 160 is coupled to the second gating circuit 120, and the first driving circuit 140 is coupled to the first gating circuit 110.

[0043] For example, the switching circuit in the third driving circuit 160 is coupled to the second output terminal VW1, wherein the switching circuit includes: a first switching resistor R21, a second switching resistor R22, and a first switching transistor M21; the first amplification circuit is coupled to the second gating circuit 120, wherein the first amplification circuit includes: a first amplification transistor M22 and a second amplification transistor M23.

[0044] For more details regarding the third drive circuit 160, please refer to [link / reference needed]. Figure 2 Description of the first drive circuit 140.

[0045] In this application, the second driving circuit and the fourth driving circuit have the same structure, but in response to different control signals, the second driving circuit and the fourth driving circuit are turned on in a time-division manner to selectively turn on the first gating circuit and the second gating circuit, so that the first end and the second end of the light-emitting component have different potentials.

[0046] The following explanation uses the structure of the second driving circuit as an example.

[0047] Combination Figures 1 to 3 See Figure 4 The schematic diagram of a partial structure of the third driving circuit in the embodiment of this application is shown below. Figure 4As shown, the second driving circuit 150 includes a push-pull circuit 310 coupled to the control circuit 130 and configured to output a second initial driving signal according to the power supply voltage VDD when the second control signal is turned on; and a second amplifier circuit 320 coupled to the push-pull circuit 310 and the first gating circuit 110 respectively, configured to amplify the second initial driving signal to generate a second driving signal and output it to the first gating circuit 110.

[0048] The fourth driving circuit has the same structure as the second driving circuit. The push-pull circuit in the fourth driving circuit is coupled to the first output terminal, and the second amplifier circuit is coupled to the second gating circuit. It is used to generate the fourth driving signal and output it to the second gating circuit.

[0049] For example, the push-pull circuit 310 includes a second voltage divider branch and a push-pull branch. The second voltage divider branch is used to divide the second control signal, so that the divided signal can drive the push-pull branch to conduct the subsequent circuit. Furthermore, by providing the second voltage divider branch, a protective function is achieved, reducing the risk of damage to the push-pull branch due to an excessively large second control signal.

[0050] Accordingly, by adopting a push-pull branch, the efficiency, output power, and driving capability of the second drive circuit 150 are improved, while distortion and static power consumption are significantly reduced.

[0051] In some embodiments, the second voltage divider branch includes: a fourth resistor R41 and a fifth resistor R42, the first end of the fourth resistor R41 is coupled to the second output terminal VW1 and the first end of the fifth resistor R42 respectively, the second end of the fourth resistor R41 is connected to the first ground GND; the second end of the fifth resistor R42 is coupled to the push-pull branch.

[0052] The push-pull branch includes: a fourth transistor M41 and a fifth transistor M42. 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 inputs the power 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.

[0053] In some embodiments, the second amplifier circuit 320 includes a second totem pole, which includes a sixth transistor M43 and a seventh transistor M44. The control terminal of the sixth transistor M43 is coupled to the control terminal of the seventh transistor M44 and the push-pull circuit 310, respectively. The first terminal of the sixth transistor M43 is connected to the first ground GND, and the second terminal of the sixth transistor M43 is coupled to the second terminal of the seventh transistor M44 and the first gating circuit 110, respectively. The first terminal of the seventh transistor M44 is input to the power supply voltage VDD.

[0054] For details on the working mechanism of the second totem pole, please refer to the description of the first totem pole.

[0055] Correspondingly, combined Figures 1 to 4 See Figure 5 The schematic diagram of a partial structure of the fourth driving circuit in the embodiments of this application is shown below. Figure 5 As shown, the fourth driving circuit 170 and the second driving circuit 150 have the same structure, the difference being that the fourth driving circuit 170 is coupled to the second gating circuit 120, and the second driving circuit 150 is coupled to the first gating circuit 110.

[0056] For example, the push-pull circuit in the fourth drive circuit 170 is coupled to the first output terminal CW1. The push-pull circuit includes: a first push-off resistor R31 and a second push-off resistor R32, a first push-off transistor M31, and a second push-off transistor M32. The second amplifier circuit is coupled to the second selection circuit 120. The second amplifier circuit includes: a third amplifying transistor M33 and a fourth amplifying transistor M34. For more details regarding the fourth drive circuit 170, please refer to [link to relevant documentation]. Figure 4 Description of the second drive circuit 150.

[0057] Combination Figures 1 to 5 See Figure 6 The partial structural diagram of the fifth driving circuit in the embodiment of this application is shown below. Figure 6 As shown, the first gating circuit 110 includes: a first half-bridge branch composed of an eighth transistor M1 and a ninth transistor M2; the control terminal of the eighth transistor M1 is coupled to the first driving circuit 140; the first terminal of the eighth transistor M1 is input to the power supply voltage VDD; the second terminal of the eighth transistor M1 is coupled to the second terminal of the ninth transistor M2 and coupled to the first terminal of the light-emitting component; the control terminal of the ninth transistor M2 is coupled to the second driving circuit 150; and the first terminal of the ninth transistor M2 is connected to the second ground AGND.

[0058] In other words, this application enables the first and second terminals of the light-emitting component to have different potentials by time-division multiplexing the eighth transistor M1 and the ninth transistor M2.

[0059] For example, if the eighth transistor M1 is turned on, the first terminal of the light-emitting component is connected to the power supply voltage VDD, and if the ninth transistor M2 is turned on, the first terminal of the light-emitting component is connected to the second ground AGND.

[0060] Accordingly, the second gating circuit 120 includes: a second half-bridge branch composed of a tenth transistor M3 and an eleventh transistor M4, wherein the control terminal of the tenth transistor M3 is coupled to the third driving circuit 160, the first terminal of the tenth transistor M3 is input to the power supply voltage VDD, the second terminal of the tenth transistor M3 is coupled to the second terminal of the eleventh transistor M4, and is coupled to the second terminal of the light-emitting component; the control terminal of the eleventh transistor M4 is coupled to the fourth driving circuit 170, and the first terminal of the eleventh transistor is connected to the second ground AGND.

[0061] In other words, this application achieves different potentials at the first and second ends of the light-emitting component by time-division multiplexing the tenth transistor M3 and the eleventh transistor M4.

[0062] For example, if the tenth transistor M3 is turned on, the second terminal of the light-emitting component is connected to the power supply voltage VDD, while if the eleventh transistor M4 is turned on, the second terminal of the light-emitting component is connected to the second ground AGND.

[0063] Thus, by simultaneously turning on the ninth transistor M2 and the tenth transistor M3, the conduction path indicated by N2 can be formed, and by simultaneously turning on the eighth transistor M1 and the eleventh transistor M4, the conduction path indicated by N1 can be formed, thereby enabling the light-emitting component to emit light at different color temperatures in any two instances.

[0064] More specifically, interfaces J1 and J2 are provided on the path between the first gating circuit 110 and the second gating circuit 120. These interfaces J1 and J2 can be connected to the light-emitting component to provide driving electrical signals to the light-emitting component.

[0065] In some embodiments, the structure of the driving circuit can be further expanded to further improve the driving stability of the driving circuit.

[0066] See Figures 2 to 6 The driving circuit also includes one or more of the following: First filter circuit 230 and second filter circuit 240 By setting up the first filter circuit 230 and the second filter circuit 240, noise can be filtered out, and the driving quality of the first drive signal and the third drive signal can be improved.

[0067] For example, see Figure 2 The first filter circuit 230 includes: a first capacitor C11 and a sixth resistor R14. The first end of the first capacitor C11 is coupled to the first end of the sixth resistor R14 and is connected to the power supply voltage VDD. The second end of the first capacitor C11 is coupled to the second end of the sixth resistor R14, the first driving circuit 140, and the first gating circuit 110, respectively.

[0068] The second filter circuit 240 and the first filter circuit 230 have the same structure, and the second filter circuit 240 is coupled to the third drive circuit 160 and the second gating circuit 120 respectively.

[0069] For example, see Figure 3 The second filter circuit 240 includes a first filter capacitor C21 and a first filter resistor R24.

[0070] First current limiting circuit and second current limiting circuit.

[0071] See Figure 2 The first current limiting circuit includes a seventh resistor R15, the first end of which is coupled to the first driving circuit 140, and the second end of which is coupled to the first gating circuit 110.

[0072] The second current limiting circuit has the same structure as the first current limiting circuit, and the second current limiting circuit is coupled between the third driving circuit 160 and the second gating circuit 120.

[0073] See Figure 3 The second current limiting circuit includes: a first current limiting resistor R25.

[0074] The third filter circuit 250 and the fourth filter circuit 260 can filter out noise and improve the driving quality of the second and fourth drive signals.

[0075] See Figure 4 The third filter circuit 250 includes: a second capacitor C41, an eighth resistor R43, and a ninth resistor R44. The first end of the second capacitor C41 is coupled to the first end of the eighth resistor R43 and connected to the second ground AGND. The second end of the second capacitor C41 is coupled to the second end of the eighth resistor R43, the second drive circuit 150, and the first end of the ninth resistor R44, respectively. The second end of the ninth resistor R44 is coupled to the first gating circuit 110.

[0076] Because a ninth resistor R44 is provided that is coupled to the first gating circuit 110, the ninth resistor R44 can play a buffering role, improving the operational safety and stability of the first gating circuit 110.

[0077] Accordingly, see Figure 5 The fourth filter circuit 260 includes a second filter capacitor C31, a second filter resistor R33 and a fourth filter resistor R34, but the fourth filter resistor R34 is coupled to the second gating circuit 120.

[0078] For more details regarding the fourth filter circuit 260, please refer to [link / reference needed]. Figure 4 Description of the third filter circuit 250.

[0079] The third current limiting circuit 270 and the fourth current limiting circuit 280, the third current limiting circuit 270 includes: a tenth resistor R45 and an eleventh resistor R46, the first end of the tenth resistor R45 and the first end of the eleventh resistor R46 are coupled and input to the power supply voltage VDD, the second end of the tenth resistor R45 and the eleventh resistor R46 are coupled to the second drive circuit 150.

[0080] The fourth current limiting circuit 280 and the third current limiting circuit 270 have the same structure, and the fourth current limiting circuit 280 is coupled to the fourth driving circuit 170.

[0081] For example, the fourth current limiting circuit 280 includes a second current limiting resistor R34 and a third current limiting resistor R35.

[0082] See Figure 6 The fifth filter circuit is coupled to the first gate circuit 110 and the first end of the light-emitting component, respectively. The fifth filter circuit includes: a third capacitor C1 and a twelfth resistor R1. The first end of the third capacitor C1 is coupled to the first gate circuit 110 and the first end of the light-emitting component, respectively. The second end of the third capacitor C1 is coupled to the twelfth resistor R1. The second end of the twelfth resistor R1 is connected to the first ground GND.

[0083] The sixth filter circuit is coupled to the second gate circuit 120 and the second terminal of the light-emitting component, respectively. The sixth filter circuit includes: a fourth capacitor C2 and a thirteenth resistor R2. The first terminal of the fourth capacitor C2 is coupled to the second gate circuit 120 and the second terminal of the light-emitting component, respectively. 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.

[0084] And a fifth current limiting circuit, which includes a fourteenth resistor R3 coupled between the first gating circuit 110 and the second gating circuit 120.

[0085] By setting filter circuits and current limiting circuits at the output terminals of the first gating circuit 110 and the second gating circuit 120, the stability of the first driving signal and the second driving signal is improved, which is beneficial to improving the stability of the illumination light.

[0086] In some embodiments, the first drive signal and / or the second drive signal may also be detected to determine whether the first drive signal or the second drive signal in the current state meets the lighting requirements.

[0087] For example, the driving circuit further includes: a detection circuit, coupled to the first gating circuit, the second gating circuit and the control circuit respectively, configured to acquire the driving current when the first gating circuit and / or the second gating circuit is selected, and convert the driving current into a detection voltage and output it to the control circuit; the control circuit is further configured to generate a third control signal according to the detection voltage and a first preset voltage threshold, the third control signal being used to control whether to output the first control signal and / or the second control signal.

[0088] In some embodiments, when the light-emitting component is in a light-emitting state, a detection voltage corresponding to the driving current can be acquired. Thus, the control circuit can generate a third control signal based on the detection voltage and a pre-set first preset voltage threshold. This third control signal can determine the state of the light-emitting component, thereby allowing the light-emitting state of the component to be adjusted accordingly.

[0089] For example, if the difference between the detected voltage and the first preset voltage threshold is within the set threshold range, it indicates that the light intensity provided by the light-emitting component meets the requirements and the current light-emitting state is maintained.

[0090] If the difference between the detected voltage and the first preset voltage threshold is not within the set threshold range, the first control signal and / or the second control signal will be stopped being sent via the third control signal, and the light-emitting component will not emit light.

[0091] See Figure 7 The schematic diagram shown in this application illustrates the structure of a detection circuit in an embodiment of the present application. Figure 7 As shown, the detection circuit may include: The conversion circuit 710 is configured to convert the drive current into an initial detection voltage; Gain circuit 720, coupled to conversion circuit 710, is configured to amplify the initial detection voltage to generate a detection voltage; The conversion circuit 710 includes a fifteenth resistor R71 and a sixteenth resistor R72. The first end of the fifteenth resistor R71 is coupled to the first end of the sixteenth resistor R72, and is also coupled to the first gating circuit 110 and the second gating circuit 120, respectively. The second end of the fifteenth resistor R71 and the second end of the sixteenth resistor R72 are connected to the first ground GND.

[0092] That is, the driving current is converted into the initial detection voltage through the conversion effect of the fifteenth resistor R71 and the sixteenth resistor R72.

[0093] The gain circuit 720 includes an operational amplifier 722 and a feedback branch 724. The first input terminal and the second terminal of the operational amplifier 722 are coupled to the conversion circuit 710, and the output terminal of the operational amplifier 722 is coupled to the control circuit 130.

[0094] The feedback branch 724 includes a seventeenth resistor R77 and an eighteenth resistor R76. The first end of the seventeenth resistor R77 is coupled to the output terminal of the operational amplifier 722, and the second end of the seventeenth resistor R77 is coupled to the first end of the eighteenth resistor R76 and the second end of the operational amplifier 722, respectively. The second end of the eighteenth resistor R76 is connected to the first ground GND.

[0095] In some optional examples, the detection circuit may also include: The nineteenth resistor R73 is coupled between the fifteenth resistor R71 and the first terminal of the operational amplifier 722.

[0096] The twentieth resistor R74 is coupled between the fifteenth resistor R71 and the second terminal of the operational amplifier 722.

[0097] The fifth capacitor C72 is coupled between the first and second terminals of the operational amplifier 722.

[0098] Accordingly, the feedback branch 724 may also include: a sixth capacitor C74 coupled to the seventeenth resistor R77, and a seventh capacitor C73 coupled to the eighteenth resistor R76.

[0099] The eighth capacitor C71 and the twentieth resistor R75 are coupled to the first terminal of the operational amplifier 722 and are used for filtering. The first terminals of the eighth capacitor C71 and the twentieth resistor R75 are connected to the first ground GND. The first terminals of the eighth capacitor C71 and the twentieth resistor R75 are both coupled to the first terminal of the operational amplifier 722.

[0100] The ninth capacitor C75, the twenty-second resistor R78, and the twenty-third resistor R79 are coupled to the output of the operational amplifier 722 and used for filtering. The first end of the twenty-second resistor R78 is coupled to the output of the operational amplifier 722, and the first end of the twenty-second resistor R78 is coupled to the twenty-third resistor R79, the first end of the ninth capacitor C75, and the control circuit 130, respectively. The second ends of the ninth capacitor C75 and the twenty-third resistor R79 are connected to the first ground GND.

[0101] In this embodiment, the control circuit can be a controller capable of outputting PWM signals. For example, the control circuit is a microcontroller (MCU).

[0102] This application also provides a lighting circuit, see [link to relevant documentation] Figure 8 The schematic diagram shown in this application illustrates the structure of a lighting circuit 800, which may include: The driving circuit 810 as described in any of the foregoing embodiments; The light-emitting component 820 is coupled to the driving circuit 810. The light-emitting component has a first light-emitting branch and a second light-emitting branch, and the first light-emitting branch and the second light-emitting branch emit light in a time-division rotating manner.

[0103] For more information on the structure and working principle of the drive circuit 810, please refer to the aforementioned example.

[0104] Using the driving circuit described in the example above, the first light-emitting branch is made to emit light by controlling the output timing of the first and second control signals. Before reversing, the light-emitting component 820 is made not to emit light and is in a "dead zone" by configuring the level states of the first and second control signals (e.g., low level "0"). At the next moment, the level states of the first and second control signals are changed again to make the second light-emitting branch emit light. In this way, the persistence of vision is used to achieve rapid changes between two color temperatures.

[0105] While the embodiments disclosed herein are as described above, this utility model is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of this utility model; therefore, the scope of protection of this utility model should be determined by the scope defined in the claims.

Claims

1. A driving circuit, characterized in that, include: The first gating circuit (110) is coupled to the first end of the light-emitting component; The second gating circuit (120) is coupled to the second end of the light-emitting component; The control circuit (130) has a first output terminal configured to output a first control signal and a second output terminal configured to output a second control signal, wherein the first control signal and the second control signal are output in a time-division manner; A first driving circuit (140) and a second driving circuit (150) coupled to the first gating circuit (110), and a third driving circuit (160) and a fourth driving circuit (170) coupled to the second gating circuit (120); in response to the first control signal, the first driving circuit (140) coupled to the first output terminal enables the first gating circuit (110), causing the first end of the light-emitting component to be coupled to the power supply voltage, and the fourth driving circuit (170) coupled to the first output terminal enables the second gating circuit (120), causing the second end of the light-emitting component to be coupled to ground; in response to the second control signal, the third driving circuit (160) coupled to the second output terminal enables the second gating circuit (120), causing the second end of the light-emitting component to be coupled to the power supply voltage, and the second driving circuit (150) coupled to the second output terminal enables the first gating circuit (110), causing the first end of the light-emitting component to be coupled to ground.

2. The driving circuit according to claim 1, characterized in that, The first driving circuit (140) includes: A switching circuit (210), coupled to the first output terminal, is configured to output a first initial drive signal according to the power supply voltage in response to the first control signal being turned on. The first amplification circuit (220) is coupled to the switching circuit (210) and the first gating circuit (110) respectively, and is configured to amplify the first initial driving signal, generate the first driving signal, and output it to the first gating circuit (110). The third driving circuit (160) has the same structure as the first driving circuit (140). The switching circuit (210) in the third driving circuit (160) is coupled to the second output terminal, and the first amplification circuit (220) is coupled to the second gating circuit (120) to generate a second driving signal and output it to the second gating circuit (120).

3. The driving circuit according to claim 2, characterized in that, The switching circuit (210) includes: A first voltage divider branch and a switching branch, wherein the first voltage divider branch includes: a first resistor (R11) and a second resistor (R12), the first end of the first resistor (R11) is coupled to the first end of the second resistor (R12) and the first output terminal respectively, and the second end of the first resistor (R11) is connected to the first ground; the second end of the second resistor (R12) is coupled to the switching branch; the switching branch includes a first transistor (M11) and a third resistor (R13), the control terminal of the first transistor (M11) is coupled to the first voltage divider branch, the first end of the first transistor (M11) is coupled to the first end of the third resistor (R13) and the first amplifier circuit (220) respectively, and the second end of the first transistor (M11) is connected to the first ground; the second end of the third resistor (R13) is input to the power supply voltage; The first amplifier circuit (220) includes: a first totem pole, the first totem pole including: a second transistor (M12) and a third transistor (M13), the control terminal of the second transistor (M12) is coupled to the control terminal of the third transistor (M13) and the switching circuit (210), the first terminal of the second transistor (M12) is connected to the first ground, the second terminal of the second transistor (M12) is coupled to the second terminal of the third transistor (M13) and the first gating circuit (110); the first terminal of the third transistor (M13) is input with the power supply voltage.

4. The driving circuit according to claim 2, characterized in that, The second driving circuit (150) includes: A push-pull circuit (310), coupled to the second output terminal, is configured to output a second initial drive signal according to the power supply voltage in response to the second control signal being turned on. The second amplifier circuit (320) is coupled to the push-pull circuit (310) and the first gating circuit (110) respectively, and is configured to amplify the second initial drive signal to generate a third drive signal and output it to the first gating circuit (110). The fourth driving circuit (170) has the same structure as the second driving circuit (150). The push-pull circuit (310) in the fourth driving circuit (170) is coupled to the first output terminal, and the second amplifier circuit (320) is coupled to the second gating circuit (120) to generate the fourth driving signal and output it to the second gating circuit (120).

5. The driving circuit according to claim 4, characterized in that, The push-pull circuit (310) includes a second voltage divider branch and a push-pull branch. The second voltage divider branch includes a fourth resistor (R41) and a fifth resistor (R42). The first end of the fourth resistor (R41) is coupled to the second output terminal and the first end of the fifth resistor (R42), respectively. The second end of the fourth resistor (R41) is connected to a first ground. The second end of the fifth resistor (R42) is coupled to the push-pull branch. The push-pull branch includes a fourth transistor (M41) and a fifth transistor (M42). The control terminal of the fourth transistor (M41) is coupled to the second voltage divider branch. The first end of the fourth transistor (M41) is coupled to the control terminal of the fifth transistor (M42) and receives the power supply voltage. The second ends of the fourth transistor (M41) and the fifth transistor (M42) are connected to a first ground. The first end of the fifth transistor (M42) is coupled to the second amplifier circuit (320). The second amplifier circuit (320) includes a second totem pole, which includes a sixth transistor (M43) and a seventh transistor (M44). The control terminal of the sixth transistor (M43) is coupled to the control terminal of the seventh transistor (M44) and the push-pull circuit (310). The first terminal of the sixth transistor (M43) is connected to the first ground. The second terminal of the sixth transistor (M43) is coupled to the second terminal of the seventh transistor (M44) and the first gating circuit (110). The first terminal of the seventh transistor (M44) is input with the power supply voltage.

6. The driving circuit according to claim 1, characterized in that, The first gating circuit (110) includes: a first half-bridge branch composed of an eighth transistor and a ninth transistor, wherein the control terminal of the eighth transistor is coupled to the first driving circuit (140), the first terminal of the eighth transistor is input to the power supply voltage, the second terminal of the eighth transistor is coupled to the second terminal of the ninth transistor, and is coupled to the first terminal of the light-emitting component; the control terminal of the ninth transistor is coupled to the second driving circuit (150), and the first terminal of the ninth transistor is coupled to the second ground; The second selection circuit (120) includes: a second half-bridge branch composed of a tenth transistor and an eleventh transistor, wherein the control terminal of the tenth transistor is coupled to the third driving circuit (160), the first terminal of the tenth transistor is input to the power supply voltage, the second terminal of the tenth transistor is coupled to the second terminal of the eleventh transistor and coupled to the second terminal of the light-emitting component; the control terminal of the eleventh transistor is coupled to the fourth driving circuit (170), and the first terminal of the eleventh transistor is connected to the second ground.

7. The driving circuit according to claim 1, characterized in that, The driving circuit also includes one or more of the following: A first filter circuit (230) and a second filter circuit (240). The first filter circuit (230) includes 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 power supply voltage. The second terminal of the first capacitor (C11) is coupled to the second terminal of the sixth resistor (R14), the first driving circuit (140), and the first gating circuit (110). The second filter circuit (240) and the first filter circuit (230) have the same structure. The second filter circuit (240) is coupled to the third driving circuit (160) and the second gating circuit (120). A first current limiting circuit and a second current limiting circuit, wherein the first current limiting circuit includes: a seventh resistor, the first end of which is coupled to the first driving circuit (140), and the second end of which is coupled to the first gating circuit (110); the second current limiting circuit and the first current limiting circuit have the same structure, and the second current limiting circuit is coupled between the third driving circuit (160) and the second gating circuit (120); The third filter circuit (250) and the fourth filter circuit (260) are described. The third filter circuit (250) includes a second capacitor (C41), an eighth resistor (R43), and a ninth resistor (R44). The first end of the second capacitor (C41) is coupled to the first end of the eighth resistor (R43) and connected to a second ground. The second end of the second capacitor (C41) is coupled to the second end of the eighth resistor (R43), the second driving circuit (150), and the first end of the ninth resistor (R44). The second end of the ninth resistor (R44) is coupled to the first gating circuit (110). The fourth filter circuit (260) and the third filter circuit (250) have the same structure. The fourth filter circuit (260) is coupled between the fourth driving circuit (170) and the second gating circuit (120). The third current limiting circuit (270) and the fourth current limiting circuit (280) are provided. The third current limiting circuit (270) includes a tenth resistor (R45) and an eleventh resistor (R46). The first end of the tenth resistor (R45) and the first end of the eleventh resistor (R46) are coupled and input to the power supply voltage. The second ends of the tenth resistor (R45) and the eleventh resistor (R46) are coupled to the second driving circuit (150). The fourth current limiting circuit (280) and the third current limiting circuit (270) have the same structure. The fourth current limiting circuit (280) is coupled to the fourth driving circuit (170). A fifth filter circuit is coupled to the first gating circuit (110) and the first terminal of the light-emitting component, respectively. The fifth filter circuit includes a third capacitor (C1) and a twelfth resistor (R1). The first terminal of the third capacitor (C1) is coupled to the first gating circuit (110) and the first terminal of the light-emitting component, respectively. The second terminal of the third capacitor (C1) is coupled to the twelfth resistor (R1). The second terminal of the twelfth resistor (R1) is grounded. A sixth filter circuit is coupled to the second gating circuit (120) and the second terminal of the light-emitting component, respectively. The sixth filter circuit includes a fourth capacitor (C2) and a thirteenth resistor (R2). The first terminal of the fourth capacitor (C2) is coupled to the second gating circuit (120) and the second terminal of the light-emitting component, respectively. The second terminal of the fourth capacitor (C2) is coupled to the thirteenth resistor (R2). The second terminal of the thirteenth resistor (R2) is grounded. The fifth current limiting circuit includes a fourteenth resistor (R3) coupled between the first gating circuit (110) and the second gating circuit (120).

8. The driving circuit according to claim 1, characterized in that, Also includes: The detection circuit is coupled to the first gating circuit (110), the second gating circuit and the control circuit (130) respectively, and is configured to acquire the drive current when the first gating circuit (110) and / or the second gating circuit is selected, and convert the drive current into a detection voltage and output it to the control circuit (130). The control circuit (130) is further configured to generate a third control signal based on the detected voltage and a first preset voltage threshold, the third control signal being used to control whether to output the first control signal and / or the second control signal.

9. The driving circuit according to claim 8, characterized in that, The detection circuit includes: The conversion circuit (710) is configured to convert the drive current into an initial detection voltage; A gain circuit (720), coupled to the conversion circuit (710), is configured to amplify the initial detection voltage to generate the detection voltage; The conversion circuit (710) includes a fifteenth resistor (R71) and a sixteenth resistor (R72). The first end of the fifteenth resistor (R71) is coupled to the first end of the sixteenth resistor (R72) and is coupled to the first gating circuit (110) and the second gating circuit, respectively. The second end of the fifteenth resistor (R71) and the second end of the sixteenth resistor (R72) are connected to the first ground. The gain circuit (720) includes an operational amplifier (722) and a feedback branch (724). The first input terminal and the second terminal of the operational amplifier (722) are coupled to the conversion circuit (710), and the output terminal of the operational amplifier (722) is coupled to the control circuit (130). The feedback branch (724) includes 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), and the second terminal of the seventeenth resistor (R77) is coupled to the first terminal of the eighteenth resistor (R76) and the second terminal of the operational amplifier (722), respectively. The second terminal of the eighteenth resistor (R76) is connected to the first ground.

10. A lighting circuit, characterized in that, include: The driving circuit as described in any one of claims 1 to 9; The light-emitting component is coupled to the driving circuit. The light-emitting component has a first light-emitting branch and a second light-emitting branch, and the first light-emitting branch and the second light-emitting branch emit light in a time-division manner.

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