Light emitting device

Abstract

The present application provides a light emitting device (10) comprising: a driving module (100), the driving module comprising a power supply output positive terminal and a power supply output negative terminal, the driving module being configured to output a power supply voltage through the power supply output positive terminal and the power supply output negative terminal; and a plurality of light source modules (200), each light source module comprising a light source string (210), a first input positive end and a first input negative end, the first input positive end being electrically connected to the power supply output positive end, and the first input negative end being electrically connected to the power supply output negative end; wherein at least one of the light source modules comprises a step-down circuit (220), in the light source module comprising the step-down circuit, the step-down circuit is electrically connected between the first input positive terminal and the power supply positive terminal of the light source string, and the step-down circuit is electrically connected between the first input positive terminal and the power supply positive terminal of the light source string. The step-down circuit is configured to step down a received input voltage to a normal working voltage required by the light source string.

Description

Technical Field

[0001] The present application relates to the field of lighting technology, and more specifically, to a light-emitting device. Background Art

[0002] In the field of lighting technology, various lighting or signaling devices are known for providing light for lighting or signaling. For example, headlights are used in motor vehicles to provide lighting or signaling functions to ensure safe driving or to provide decorative functions.

[0003] Interior lighting in motor vehicles typically includes multiple lamp modules, often located relatively far apart. Powering these modules typically requires multiple driver circuits, each dedicated to a specific module, significantly increasing costs. If a single driver circuit were used to power multiple modules simultaneously, the long distances between them would prevent the driver circuit from providing sufficient voltage to meet the requirements of all modules.

[0004] Therefore, it is currently an urgent need to provide a new light-emitting device to overcome the above-mentioned defects. Summary of the Invention

[0005] One purpose of the present application is to overcome at least one of the problems and drawbacks in the prior art.

[0006] A first aspect of the present application provides a light emitting device, comprising:

[0007] a driving module, the driving module comprising a positive power output terminal and a negative power output terminal, the driving module being configured to output a power voltage through the positive power output terminal and the negative power output terminal; and

[0008] A plurality of light source modules, each light source module comprising a light source string, a first positive input terminal, and a first negative input terminal, wherein the first positive input terminal is electrically connected to the positive output terminal of the power supply, and the first negative input terminal is electrically connected to the negative output terminal of the power supply;

[0009] Among them, at least one of the light source modules includes a step-down circuit. In the light source module including the step-down circuit, the step-down circuit is electrically connected between the first input positive terminal and the positive terminal of the power supply of the light source string, and the step-down circuit is configured to step down the received input voltage to the normal operating voltage required by the light source string.

[0010] In some embodiments, the light source module includes a signal converter, wherein a positive power terminal of the signal converter is electrically connected to a positive power terminal of the light source string, and a negative power terminal of the signal converter is electrically connected to a negative power terminal of the light source string;

[0011] In the light source module including the step-down circuit, the positive power terminal of the signal converter is electrically connected to the first positive input terminal through the step-down circuit, and the step-down circuit is configured to step down the received input voltage to the normal operating voltage required by the signal converter.

[0012] In some embodiments, the light source module includes a first positive output terminal and a first negative output terminal, the first positive output terminal is electrically connected to the first positive input terminal through a positive lead, and the first negative output terminal is electrically connected to the first negative input terminal through a negative lead;

[0013] The plurality of light source modules are connected in cascade sequence, the first positive input terminal of the light source module of the first stage is electrically connected to the positive output terminal of the power supply through a connecting line, and the first negative input terminal of the light source module of the first stage is electrically connected to the negative output terminal of the power supply through a connecting line;

[0014] The first input positive terminal of the light source module located at the rear stage is electrically connected to the first output positive terminal of the light source module at the previous stage through a connecting line, and is indirectly electrically connected to the power supply output positive terminal via the positive lead of the light source module at the previous stage. The first input negative terminal of the light source module located at the rear stage is electrically connected to the first output negative terminal of the light source module at the previous stage through a connecting line, and is indirectly electrically connected to the power supply output negative terminal via the negative lead of the light source module at the previous stage.

[0015] In some embodiments, in the light source module including the step-down circuit, the step-down circuit includes a diode or multiple diodes connected in series, the anode of the diode is electrically connected to the first input positive terminal, and the cathode of the diode is electrically connected to the positive terminal of the power supply of the light source string.

[0016] In some embodiments, the light source string includes a plurality of light sources, and the negative power terminals of the plurality of light sources are electrically connected to the first negative input terminal of the light source module;

[0017] In the light source module including a step-down circuit, the positive power terminals of the plurality of light sources are electrically connected to the first positive input terminal of the light source module through the step-down circuit;

[0018] In the light source module that does not include a step-down circuit, the positive power supply terminals of the plurality of light sources are directly electrically connected to the first positive input terminal of the light source module through a conductive lead.

[0019] In some embodiments, the light source is a smart LED, the light source is an RGB LED, and the light source is configured to emit required light according to a received control signal.

[0020] In some embodiments, the input voltage received by the light source module of the preceding stage is greater than the input voltage received by the light source module of the succeeding stage.

[0021] In some embodiments, the normal operating voltages of the light sources in the light source string are the same, the power ends of the light sources in the light source string are connected in parallel, and the signal ends are connected in series;

[0022] The light source module of the first stage includes a step-down circuit, and the light source module of the first stage steps down the received input voltage to the normal working voltage required by the light source string;

[0023] The light source module of the last stage does not include a step-down circuit, and the input voltage received by the light source module of the last stage is equal to the normal operating voltage required by the light source string.

[0024] In some embodiments, the positive leads of the plurality of light source modules are electrically connected in sequence via a connecting line, the positive leads and the connecting line electrically connected thereto are integrally formed into a power bypass line, and the power supply voltage is sequentially transmitted from front to back via the power bypass line;

[0025] The positive electrode lead is a conductive lead on a circuit board, and the connecting circuit includes a wire and / or a connector.

[0026] In some embodiments, each of the light source modules is formed as a separate light board, and each light board is used to illuminate a corresponding area.

[0027] In some embodiments, the driving module includes a control circuit and a voltage regulating circuit, wherein the voltage regulating circuit is electrically connected to the control circuit, the positive output terminal of the power supply, and the negative output terminal of the power supply;

[0028] The voltage regulating circuit is configured to convert a received external voltage into the power supply voltage according to a power supply control signal of the control circuit.

[0029] In some embodiments, the driving module includes a signal conversion circuit and a signal output terminal, wherein the signal conversion circuit is electrically connected between the control circuit and the signal output terminal, and the signal conversion circuit is configured to convert a light source control signal in a first format output by the control circuit into a light source control signal in a second format, and output the light source control signal in the second format from the signal output terminal;

[0030] The signal converter in the light source module includes a first signal transceiver and a second signal transceiver, wherein the first transceiver, the light source string, and the second transceiver are electrically connected in sequence;

[0031] The first transceiver of the light source module of the first stage is electrically connected to the signal output end, the first signal transceiver of the light source module at the subsequent stage is electrically connected to the second signal transceiver of the light source module at the previous stage, and the light source string is turned on and off accordingly according to the light source control signal.

[0032] In some embodiments, the signal conversion circuit, the first transceiver, and the second transceiver comprise CAN transceivers;

[0033] In the light source module including the step-down circuit, the positive power terminals of the first transceiver and the second transceiver are electrically connected to the second input terminal through the step-down circuit.

[0034] In some embodiments, the plurality of light sources in the light source string each include a signal terminal, and the plurality of light sources in the light source string are sequentially cascaded through the signal terminal.

[0035] In some embodiments, the light-emitting device is used as an interior light of a motor vehicle, and the interior light includes one or more of a driver's seat console atmosphere light, a center console atmosphere light, a passenger seat atmosphere light, an armrest light, a charging light, an air-conditioning outlet light, and a door panel light. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the circuit structure of the light-emitting device provided in an embodiment of the present application;

[0037] Figure 2 This is a schematic diagram of the circuit structure of the light source string provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following is a detailed description of the embodiments of the present application in conjunction with the accompanying drawings. It should be understood that the embodiments of the present application are primarily intended to illustrate possible implementations of the technical solution of the present application and should not be construed as limiting the technical solution of the present application. In this specification, identical or similar components are indicated by identical or similar reference numerals.

[0039] Figure 1 A schematic diagram of the circuit structure of the light emitting device 10 provided in an embodiment of the present application; Figure 2 Schematic diagram of the circuit structure of the light source string 210 provided in an embodiment of the present application.

[0040] like Figure 1-2As shown, an embodiment of the present application provides a light-emitting device 10 that can be used as an interior light for a motor vehicle, also known as an in-vehicle ambient light. The interior light includes one or more of a driver's console ambient light, a center console ambient light, a passenger seat ambient light, an armrest light, a charging light, an air conditioning vent light, and a door panel light. In addition to being used as an interior light, the light-emitting device can also be used as an exterior signal indicator light, which will not be listed here. The light-emitting device 10 includes a driver module 100 and multiple light source modules 200. The driver module 100 can drive the multiple light source modules 200 to achieve the desired multiple light functions. In this embodiment, the number of light source modules 200 is three. From closest to the driver module 100 to farthest from the driver module 100, the three light source modules 200 are, in order, a first-stage light source module 200, a second-stage light source module 200, and a third-stage light source module 200; however, in other embodiments, the number of light source modules 200 can also be two, four, or more.

[0041] The driver module 100 includes a positive power output terminal Vs+ and a negative power output terminal Vs-. The driver module 100 is configured to output a power supply voltage Vs through the positive power output terminal Vs+ and the negative power output terminal Vs-. The light source module 200 includes a light source string 210, a first positive input terminal Vin+, and a first negative input terminal Vin-. The first positive input terminal Vin+ is electrically connected to the positive power output terminal Vs+, and the first negative input terminal Vin- is electrically connected to the negative power output terminal Vs-. At least one of the light source modules 200 includes a step-down circuit 220. In the light source module 200 including the step-down circuit 220, the step-down circuit 220 is electrically connected between the first positive input terminal Vin+ and the positive power terminal VL+ of the light source string 210. The step-down circuit 220 is configured to step down the received input voltages Vin1 and Vin2 to the normal operating voltage VL required by the light source string 210. It is worth noting that the electrical connection in the embodiments of the present application refers to electrical coupling, which may refer to a direct connection between two components, or an indirect connection between two components through wires, connectors and / or other electronic components.

[0042] In this embodiment, only one driver module 100 is used to power multiple light source modules 200, significantly saving costs. Because line losses often occur in the connection lines 300 between the first-stage light source module 200 and the driver module 100, as well as in the connection lines 300 between the multiple light source modules 200, the actual input voltage received by each light source module 200 may be lower than the power supply voltage Vs output by the driver module 100. Furthermore, the input voltage received by the preceding light source module 200 is higher than the input voltage received by the succeeding light source module 200. For example, the input voltage Vin1 of the first-stage light source module 200, the input voltage Vin2 of the second-stage light source module 200, and the input voltage Vin3 of the third-stage light source module 200 are in the following relationship: Vin1 > Vin2 > Vin3. Therefore, in this embodiment, the power supply voltage Vs output by the driver module 100 can be appropriately increased, so that the power supply voltage Vs is higher than the normal operating voltage VL of the light source 211. Even if there is line loss, it is possible to ensure that the input voltages Vin1, Vin2, and Vin3 reaching each light source module 200 are greater than or equal to the normal operating voltage VL. When the same type of light source 211 is used to form the light source string 210, the normal operating voltage VL required by the light sources 211 in the light source string 210 is the same. In a light source module 200 where the input voltage is greater than the normal operating voltage, a step-down circuit 220 is provided to step down the larger input voltage to a smaller normal operating voltage VL, thereby ensuring that the light sources 211 in the light source module 200 can operate normally. In a light source module 200 where the input voltage is equal to the normal operating voltage, a step-down circuit 220 is not required, and the input voltage is directly used as the driving voltage of the light source string 210. This ensures that the power supply of multiple light source modules 200 can meet the requirements, and only one driver module 100 is used, that is, effective lighting of a long string of light sources is achieved in a low-cost manner. It should be noted that the normal operating voltage of the light source 211 is usually within a voltage range, such as 4.3V-5.5V. When the number of light source modules 200 in the light-emitting device 10 is large and the distance between them is large, if the solution of increasing the power supply output voltage Vs and appropriately adding a step-down circuit 220 is not adopted, the input voltage of the preceding light source module 200 may be equal to the normal operating voltage VL, but the input voltage of the subsequent light source module 200 may be lower than the normal operating voltage VL due to line loss, and the subsequent light source module 200 may not operate normally. In particular, the last light source module 200 is more likely to have a poor lighting effect due to the low input voltage. Alternatively, in order to ensure that the input voltage of the subsequent light source module 200 is equal to the normal operating voltage VL, the input voltage of the preceding light source module 200 usually needs to be set larger, which may easily exceed the normal operating voltage. In this case, the preceding light source module 200 may not operate normally.Alternatively, multiple driver modules 100 can be provided to drive each light source module 200 separately, which obviously increases the cost and also increases the volume of the entire light-emitting device 10. The solution of this embodiment can effectively solve this technical problem by providing a step-down circuit 220 to ensure normal power supply to the multiple light source modules 200. In this embodiment, the light source module 200 of the preceding stage is closer to the driver module 100 than the light source module 200 of the succeeding stage, and the light source module 200 of the succeeding stage is indirectly electrically connected to the driver module 100 through the light source module 200 of the preceding stage.

[0043] In this embodiment, the light source module 200 further includes a first positive output terminal Vo+ and a first negative output terminal Vo-. The first positive output terminal Vo+ is directly electrically connected to the first positive input terminal Vin+ of the corresponding light source module 200 via a separate positive lead 205, and the first negative output terminal Vo- is electrically connected to the first negative input terminal Vin- of the corresponding light source module 200 via a negative lead 206. In the light source module 200 including the step-down circuit 220, the positive lead 205 is electrically connected between the positive electrode of the step-down circuit 220 and the first positive output terminal Vo+. The positive lead 205 can directly bypass the voltage to the next-stage light source module 200. In this embodiment, the power supply negative output terminal Vs-, the first negative input terminal Vin-, the first negative output terminal Vo, and the negative lead 206 are all electrically connected to the ground terminal GND.

[0044] The multiple light source modules 200 are connected in cascade sequence. The positive leads 205 of the multiple light source modules 200 are electrically connected in sequence via a connecting line 300. The positive leads 205 and the connecting line 300 electrically connected thereto form a power bypass line, through which the power supply voltage Vs is transmitted from front to back. The positive leads 205 can be conductive leads on a circuit board, and the connecting line 300 can include wires and / or connectors. From the preceding light source module 200 to the succeeding light source module 200, both the positive leads 205 and the connecting line 300 generate voltage drop. Specifically, the first input positive terminal Vin+ of the first-stage light source module 200 is electrically connected to the power output positive terminal Vo+ of the driving module 100 through the connecting line 300, and the first input negative terminal Vin- of the first-stage light source module 200 is electrically connected to the power output negative terminal of the driving module 100 through the connecting line 300, and the first output negative terminal Vo- is electrically connected to Vo- of the light source module 200 through the negative lead 206. The first input positive terminal Vin+ of the light source module 200 at the subsequent stage is electrically connected to the first output positive terminal Vo+ of the light source module 200 at the previous stage through the connecting line 300, and is indirectly electrically connected to the power output positive terminal Vo+ of the driving module 100 via the positive lead 205 of the light source module 200 at the previous stage. The first input negative terminal Vin- of the light source module 200 at the subsequent stage is electrically connected to the first output negative terminal Vo- of the light source module 200 at the previous stage through the connecting line 300, and is indirectly electrically connected to the power output negative terminal Vs- of the driving module 100 via the negative lead 206 of the light source module 200 at the previous stage.

[0045] In this embodiment, each light source module 200 can be formed as a separate light board, each light board is used to illuminate a corresponding area, and different light boards are used to achieve different light functions. The light boards are electrically connected to each other through a connection line 300 composed of a connector and a wiring harness.

[0046] The following describes in detail the specific configuration of the step-down circuit 220. The step-down circuit 220 can be implemented using a simple diode. For example, in the light source module 200 including the step-down circuit 220, the step-down circuit 220 can include one diode or multiple diodes connected in series, with the anode of the diode electrically connected to the first positive input terminal Vin+ of the light source module 200, and the cathode of the diode electrically connected to the positive power supply terminal VL+ of the light source string 210.

[0047] Figure 1The figure shows that the first-stage light source module 200 and the second-stage light source module 200 each include a diode, while the final-stage light source module 200, also known as the third-stage light source module 200, does not include a step-down circuit 220. The first-stage light source module 200 steps down the received input voltage Vin1 to the normal operating voltage VL required by the light source string 210; the second-stage light source module 200 steps down the received input voltage Vin2 to the normal operating voltage VL required by the light source string 210; and the final-stage light source module 200 receives an input voltage Vin3 equal to the normal operating voltage VL required by the light source string 210. In other embodiments, the first-stage light source module 200 may include two diodes connected in series, the second-stage light source module 200 may include a single diode, and the third-stage light source module 200 may not include a diode serving as the step-down circuit 220. Alternatively, when the number of light source modules 200 is greater, for example, the lighting device 10 includes a total of eight light source modules 200, one light source module 200 being used as a driver's console ambient light, one light source module 200 being used as a center console ambient light, one light source module 200 being used as a passenger seat ambient light, one light source module 200 being used as an air conditioning vent light, and the remaining four light source modules 200 being used as four door panel lights, front and rear. In this case, the light source modules 200 in the front stage or stages can be configured to include multiple diodes connected in series, the light source modules 200 in the middle stage or stages can include a single diode, and the light source modules 200 in the rear stage or stages can include no diodes. The driver module 100 outputs a relatively large power supply voltage Vs. The input voltages of each light source module 200 vary due to different line losses. However, by providing different step-down circuits, the voltage at the positive power supply terminal VL+ of the light source strings 210 in each light source module 200 is the normal operating voltage VL, and each light source string 210 can emit light normally.

[0048] Diodes are generally inexpensive, and their use can improve the lighting effect of the light-emitting device 10 at a low cost and with better stability. However, diodes typically have a fixed voltage drop value, such as 0.6V-0.8V. To more accurately and intelligently control the voltage drop of the step-down circuit 220, in some variant embodiments, a switch tube can be used instead of a diode to achieve precise and controllable voltage reduction. The step-down circuit 220 implemented by the switch tube includes, for example, a linear step-down circuit, a buck circuit, etc., which are not listed here one by one. As long as they can reduce the voltage to the required normal operating voltage VL, they are sufficient.

[0049] like Figure 2As shown, the light source string 210 includes a plurality of light sources 211. For example, the number of light sources 211 in the light source string 210 may be greater than 10, or even greater than 20 or greater than 50. The number of light sources 211 in each light source string 210 may be the same or different. The number of light sources 211 in the entire light emitting device 10 is greater than 100. Theoretically, the greater the number of light sources 211, the greater the impact of line loss voltage on the lighting effect of the light source 211. The light source 211 may include a smart LED. When the light emitting device 10 is used as an interior light, the LED may be an RGB LED. The power ends of the light sources 211 in the light source string 210 are connected in parallel, and the signal ends are connected in series. The light source 211 is configured to emit light of various colors as required according to the received control signal. Specifically, the positive power terminals VDD and VLED of the LED are electrically connected to the positive power terminal VL+ of the light source 211, and the negative power terminals GND1+2 and GND3+4 of the LED are electrically connected to the negative power terminal VL- of the light source 211. The positive power terminals VL+ of each light source 211 are electrically connected to each other, and the negative power terminals VL- of each light source 211 are electrically connected to each other.

[0050] Furthermore, in each light source module 200, the negative power supply terminal VL- of the multiple light sources 211 is electrically connected to the first negative input terminal Vin- of the light source module 200. In the light source module 200 that includes a step-down circuit 220, the positive power supply terminal VL+ of the multiple light sources 211 is electrically connected to the first positive input terminal Vin+ of the light source module 200 via the step-down circuit 220. In the light source module 200 that does not include a step-down circuit 220, the positive power supply terminal VL+ of the multiple light sources 211 is directly electrically connected to the first positive input terminal Vin+ of the light source module via a conductive lead. The conductive lead here can be a wire on a circuit board.

[0051] The driver module 100 specifically includes a control circuit 110 and a voltage regulation circuit 120. The voltage regulation circuit 120 is electrically connected to the control circuit 110, the positive power output terminal Vs+, and the negative power output terminal VS-. The voltage regulation circuit 120 is configured to convert a received external voltage Vb into the power supply voltage Vs based on a power control signal Cp from the control circuit 110. In some embodiments, the control circuit 110 may include an MCU, and the voltage regulation circuit 120 may include a filter circuit and a buck circuit. The external voltage Vb may be a vehicle body voltage. The voltage regulation circuit filters and steps down the external voltage Vb before outputting it as the power supply voltage Vs.

[0052] In addition, the driver module 100 may further include a signal conversion circuit 130 and signal output terminals Sig+ and Sig-. The signal conversion circuit 130 is electrically connected between the control circuit 110 and the signal output terminals Sig+ and Sig-. The signal conversion circuit 130 is configured to convert the light source control signal in a first format output by the control circuit 110 into a light source control signal in a second format Sig, and output the light source control signal in the second format Sig from the signal output terminal. For example, the signal conversion circuit 130 includes a format conversion circuit 131 and a CAN transceiver 132. The format conversion circuit 131 can convert the data signal output by the SPI port of the MCU into a Manchester signal and input it into the CAN transceiver 132. The format conversion circuit 131 and the CAN transceiver 132 are circuit components that are separate from each other and electrically connected to each other. In other embodiments, a single integrated signal conversion circuit 130 can also be used to implement signal conversion without subdividing the format conversion circuit 131 and the CAN transceiver 132.

[0053] Accordingly, the light source module 200 may include a signal converter, wherein the positive power terminal Vc+ of the signal converter is electrically connected to the positive power terminal VL+ of the light source string 210, and the negative power terminal of the signal converter is electrically connected to the negative power terminal of the light source string 210. That is, the negative power terminal of the signal converter and the negative power terminal of the light source string 210 are both electrically connected to the ground terminal GND. The signal converter specifically includes a first signal transceiver 230 and a second signal transceiver 240. The first transceiver 230 and the second transceiver 240 are, for example, CAN transceivers. The first transceiver 230, the light source string 210, and the second transceiver 240 are electrically connected in sequence. The first transceiver 230 of the first-stage light source module 200 is electrically connected to the signal output terminals Sig+ and Sig- of the driver module 100. The first signal transceiver 230 of the subsequent light source module 200 is electrically connected to the second signal transceiver 240 of the previous-stage light source module 200. The light source string 210 is turned on and off accordingly according to the light source control signal Sig. The multiple light sources 211 in the light source string 210 each include a signal terminal, and the multiple light sources 211 in the light source string 210 are sequentially cascaded through the signal terminals. Specifically, the light source 211 includes signal input terminals SIO1+, SIO1- and signal output terminals SIO2+, SIO2-. The signal input terminals SIO1+, SIO1- of the light source 211 at the rear stage are electrically connected to the signal output terminals SIO2+, SIO2- of the light source 211 at the front stage. The light source 211 at the front stage is closer to the first transceiver 230 than the light source 211 at the rear stage. The signal input terminals SIO1+, SIO1- of the light source 211 at the first stage are electrically connected to the corresponding first transceiver 230, and the signal output terminal of the light source 211 at the last stage is electrically connected to the corresponding second transceiver 240.

[0054] It is worth noting that in the light source module 200 including the step-down circuit 220, the positive power supply terminals of the first transceiver 230 and the second transceiver 240 are also electrically connected to the second input terminal Vin+ of the corresponding light source module 200 through the step-down circuit 220. The step-down circuit 220 can also step down the received input voltage Vin to the normal operating voltage required by the first transceiver 230 and the second transceiver 240. The normal operating voltage of the transceiver can also be within a voltage range, such as 4.75-5.25V. Because this range is smaller than the normal operating voltage range of 4.3-5.5V of the light source 211, when the connecting line 300 is long, the first transceiver 230 and the second transceiver 240 may be more susceptible to line loss voltage than the light source string 210. The provision of the step-down circuit 220 can ensure reliable signal transmission between the first transceiver 230 and the second transceiver 240.

[0055] Although the present application is described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to illustrate preferred embodiments of the present application and are not to be construed as limiting the present application. The dimensions and proportions in the drawings are merely illustrative and are not to be construed as limiting the present application.

[0056] Although some embodiments of the overall concept of the present application have been shown and described, those skilled in the art will understand that the present application may include more other equivalent embodiments without departing from the overall inventive concept of the present application, and the scope of protection of the present application is defined by the claims.

Claims

1. A light emitting device (10), characterized in that: include: A driving module (100), comprising a positive power output terminal and a negative power output terminal, and configured to output a power supply voltage via the positive power output terminal and the negative power output terminal; as well as A plurality of light source modules (200), each comprising a light source string (210), a first positive input terminal and a first negative input terminal, wherein the first positive input terminal is electrically connected to the positive output terminal of the power supply, and the first negative input terminal is electrically connected to the negative output terminal of the power supply; At least one of the light source modules includes a step-down circuit (220), and in the light source module including the step-down circuit, the step-down circuit is electrically connected between the first input positive terminal and the positive terminal of the power supply of the light source string, and the step-down circuit is configured to step down the received input voltage to a normal operating voltage required by the light source string.

2. The light emitting device according to claim 1, wherein The light source module includes a signal converter, wherein a positive power terminal of the signal converter is electrically connected to a positive power terminal of the light source string, and a negative power terminal of the signal converter is electrically connected to a negative power terminal of the light source string; In the light source module including the step-down circuit, the positive power terminal of the signal converter is electrically connected to the first positive input terminal through the step-down circuit, and the step-down circuit is configured to step down the received input voltage to the normal operating voltage required by the signal converter.

3. The light emitting device according to claim 2, wherein: The light source module comprises a first output positive terminal and a first output negative terminal, the first output positive terminal being electrically connected to the first input positive terminal via a positive lead (205), and the first output negative terminal being electrically connected to the first input negative terminal via a negative lead (206); The plurality of light source modules are connected in cascade in sequence, the first positive input terminal of the light source module of the first stage is electrically connected to the positive output terminal of the power supply via a connecting line (300), and the first negative input terminal of the light source module of the first stage is electrically connected to the negative output terminal of the power supply via a connecting line; The first input positive terminal of the light source module located at the rear stage is electrically connected to the first output positive terminal of the light source module at the previous stage through a connecting line, and is indirectly electrically connected to the power supply output positive terminal via the positive lead of the light source module at the previous stage. The first input negative terminal of the light source module located at the rear stage is electrically connected to the first output negative terminal of the light source module at the previous stage through a connecting line, and is indirectly electrically connected to the power supply output negative terminal via the negative lead of the light source module at the previous stage.

4. The light-emitting device according to claim 1, in the light source module including the step-down circuit, the step-down circuit (220) includes a diode or a plurality of diodes connected in series, the anode of the diode is electrically connected to the first input positive terminal, and the cathode of the diode is electrically connected to the positive terminal of the power supply of the light source string. The light emitting device according to claim 1 , wherein: The light source string comprises a plurality of light sources (211), wherein the negative power supply terminals of the plurality of light sources are electrically connected to the first negative input terminal of the light source module; In the light source module including a step-down circuit, the positive power terminals of the plurality of light sources are electrically connected to the first positive input terminal of the light source module through the step-down circuit; In the light source module that does not include a step-down circuit, the positive power supply terminals of the plurality of light sources are directly electrically connected to the first positive input terminal of the light source module through a conductive lead. The light emitting device according to claim 5 , wherein: The light source is a smart LED, the light source is an RGB LED, and the light source is configured to emit required light according to a received control signal.

7. The light emitting device according to any one of claims 1 to 6, wherein: The input voltage received by the light source module of the preceding stage is greater than the input voltage received by the light source module of the subsequent stage.

8. The light emitting device according to any one of claims 1 to 6, wherein: The normal operating voltages of the light sources in the light source string are the same, the power ends of the light sources in the light source string are connected in parallel, and the signal ends are connected in series; The light source module of the first stage includes a step-down circuit, and the light source module of the first stage steps down the received input voltage to the normal working voltage required by the light source string; The light source module of the last stage does not include a step-down circuit, and the input voltage received by the light source module of the last stage is equal to the normal operating voltage required by the light source string.

9. The light emitting device according to any one of claims 1 to 6, wherein: The positive leads (205) of the plurality of light source modules are electrically connected in sequence via a connecting line (300), the positive leads and the connecting line electrically connected thereto integrally forming a power bypass line, and the power supply voltage is sequentially transmitted from front to back via the power bypass line; The positive electrode lead is a conductive lead on a circuit board, and the connecting circuit includes a wire and / or a connector.

10. The light emitting device according to any one of claims 1 to 6, wherein: Each of the light source modules is formed as a separate light board, and each light board is used to illuminate a corresponding area.

11. The light emitting device according to any one of claims 1 to 6, wherein: The driving module (100) comprises a control circuit (110) and a voltage regulating circuit (120), wherein the voltage regulating circuit is electrically connected to the control circuit, the positive output terminal of the power supply, and the negative output terminal of the power supply; The voltage regulating circuit is configured to convert a received external voltage into the power supply voltage according to a power supply control signal of the control circuit.

12. The light emitting device according to claim 11, wherein The driving module comprises a signal conversion circuit (130) and a signal output terminal, wherein the signal conversion circuit is electrically connected between the control circuit and the signal output terminal, and the signal conversion circuit is configured to convert a light source control signal in a first format output by the control circuit into a light source control signal in a second format, and output the light source control signal in the second format from the signal output terminal; The signal converter in the light source module (200) comprises a first signal transceiver (230) and a second signal transceiver (240), wherein the first transceiver, the light source string, and the second transceiver are electrically connected in sequence; The first transceiver of the light source module of the first stage is electrically connected to the signal output end, the first signal transceiver of the light source module at the subsequent stage is electrically connected to the second signal transceiver of the light source module at the previous stage, and the light source string is turned on and off accordingly according to the light source control signal.

13. The light emitting device according to claim 12, wherein: The signal conversion circuit, the first transceiver and the second transceiver include CAN transceivers; In the light source module including the step-down circuit, the positive power terminals of the first transceiver and the second transceiver are electrically connected to the second input terminal through the step-down circuit.

14. The light emitting device according to claim 12, wherein: The multiple light sources in the light source string each include a signal end, and the multiple light sources in the light source string are sequentially cascaded via the signal end.

15. The light emitting device according to any one of claims 1 to 6, wherein: The light emitting device is used as an interior light of a motor vehicle, and the interior light includes one or more of a driver's seat console ambient light, a center console ambient light, a passenger seat ambient light, an armrest light, a charging light, an air-conditioning outlet light, and a door panel light.

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