CN215529380U - Light emitting circuit and electronic device - Google Patents

Light emitting circuit and electronic device Download PDF

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Publication number
CN215529380U
CN215529380U CN202122232215.4U CN202122232215U CN215529380U CN 215529380 U CN215529380 U CN 215529380U CN 202122232215 U CN202122232215 U CN 202122232215U CN 215529380 U CN215529380 U CN 215529380U
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module
voltage
light emitting
switching device
circuit
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谢赟锋
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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Abstract

The application discloses light-emitting circuit and electronic equipment, light-emitting circuit includes: the driving module is used for receiving the power supply signal and driving the light-emitting module to operate according to the power supply signal; the first end of the light-emitting module is connected with the first output end of the driving module; the partial pressure module, the first end of partial pressure module is connected with the second end of luminous module, the second end ground connection of partial pressure module, wherein, the partial pressure module is suitable for reducing the voltage reduction amplitude of power supply signal on drive module, this application is through concatenating partial pressure module between luminous module and ground connection, reduce the voltage reduction amplitude of power supply signal on drive module, drive module generates heat and reduces to some extent, therefore, drive module's temperature is stable, the probability of triggering the excess temperature protection has been reduced, thereby luminous module's steady operation has been ensured, reduce its probability that can't use.

Description

Light emitting circuit and electronic device
Technical Field
The application belongs to the technical field of circuits, and particularly relates to a light-emitting circuit and an electronic device.
Background
Among the relevant technical scheme, be provided with the flash of light that is used for the light filling on the handheld terminal and turn off the lamp, wherein, the setting of flash light can satisfy the shooting needs of handheld terminal under dim environment, supplementary handheld terminal so that obtain the piece that satisfies user's demand.
In the process of implementing the present application, at least the following problems are found in the prior art: for example, in the process of flash lamp operation, the temperature of a driving chip for driving the flash lamp to operate is often relatively high, and the over-temperature protection function of the driving chip is easily triggered, so that the flash lamp cannot be used finally.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a light-emitting circuit and electronic equipment, and at least solves one of the problems that in the prior art, the over-temperature protection function of a driving chip is easy to trigger, and finally a flash lamp cannot be used.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides a light emitting circuit, including: the driving module is used for receiving the power supply signal and driving the light-emitting module to operate according to the power supply signal; the first end of the light-emitting module is connected with the first output end of the driving module; the first end of the voltage division module is connected with the second end of the light-emitting module, and the second end of the voltage division module is grounded, wherein the voltage division module is suitable for reducing the voltage reduction amplitude of the power supply signal on the driving module.
In a second aspect, an embodiment of the present application provides an electronic device, including: a light emitting circuit as claimed in any one of the preceding claims.
In an embodiment of the present application, a light emitting circuit and an electronic device are provided, in which the light emitting circuit included in the light emitting circuit or the electronic device includes a driving module, a light emitting module, and a voltage dividing module. The driving module is used for driving the light-emitting module to work, namely driving the light-emitting module to emit light. Wherein, the partial pressure module concatenates between luminescence module and ground connection, at the drive module in-process that the drive luminescence module carries out work at the drive luminescence module, the partial pressure module has played and has reduced the voltage reduction amplitude of power supply signal on the drive module, for the drive module, after the voltage reduction amplitude of power supply signal on the drive module diminishes, energy loss on it reduces to some extent, it is corresponding, the calorific capacity of drive module has been reduced, therefore, the temperature of drive module is stable, the probability of triggering the excess temperature protection has been reduced, thereby the steady operation of luminescence module has been ensured, reduce its probability that can't use.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is one of the topological schematic diagrams of a light emitting circuit according to an embodiment of the present application;
FIG. 2 is one of the partial topology diagrams of a light emitting circuit according to an embodiment of the present application;
FIG. 3 is a second schematic diagram of a partial topology of a light emitting circuit according to an embodiment of the present application;
FIG. 4 is a third schematic diagram of a partial topology of a light emitting circuit according to an embodiment of the present application;
fig. 5 is a schematic flowchart of a control method of a first switching device and a second switching device according to an embodiment of the present application;
FIG. 6 is a second schematic diagram of a light emitting circuit according to an embodiment of the present application;
FIG. 7 is a flow diagram of control logic for a lighting circuit according to an embodiment of the present application;
fig. 8 is a schematic topology diagram of a driving module according to an embodiment of the present application.
Reference numerals:
102 driving module, 1020 crystal oscillator circuit, 1021 overtemperature protection circuit, 1022 preceding stage driving circuit, 1023 current-limiting circuit, 1024 feedback circuit, 1025 comparator, 1026 first switch tube, 1027 second switch tube, 1028 first current source, 1029 second current source, 104 light-emitting module, 106 voltage division module, 1060 voltage division module, 108 control module, 110 voltage acquisition circuit, D1 first switch device, L1 first inductor, D2 first diode, C1 first capacitor, D3 second switch device, R voltage division resistor, D4 third switch device, L2 second inductor and C2 second capacitor.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
A light-emitting circuit and an electronic device according to an embodiment of the present application are described below with reference to fig. 1 to 8.
As shown in fig. 1, a light emitting circuit according to some embodiments of the present application includes: the driving module 102 is used for receiving a power supply signal; a first end of the light-emitting module 104 is connected with a first output end of the driving module 102; a voltage dividing module 106, wherein a first end of the voltage dividing module 106 is connected to a second end of the light emitting module 104, and a second end of the voltage dividing module 106 is grounded, wherein the voltage dividing module 106 is adapted to reduce a voltage reduction amplitude of the power supply signal on the driving module 102.
In this embodiment, the light emitting circuit includes a driving module 102, a light emitting module 104, and a voltage dividing module 106. The driving module 102 is used for driving the light emitting module 104 to work, that is, the driving module 104 emits light. The voltage dividing module 106 is connected in series between the light emitting module 104 and the ground, the addition of the voltage dividing module 106 increases the resistance value from the driving module 102 to the light emitting module 104 to the ground, and in the process that the driving module 102 drives the light emitting module 104 to work, the voltage dividing module 106 plays a role in reducing the voltage reduction amplitude of the power supply signal on the driving module 102, for the driving module 102, after the voltage reduction amplitude of the power supply signal on the driving module 102 is reduced, the energy loss on the driving module is reduced, correspondingly, the heat productivity of the driving module 102 is reduced, therefore, the temperature of the driving module 102 is stable, the probability of triggering over-temperature protection is reduced, the stable work of the light emitting module 104 is ensured, and the probability of unavailable use of the light emitting module is reduced.
In some embodiments, the voltage divider module 106 includes: the voltage dividing module 1060 and the first switching device D1, wherein a first end of the voltage dividing module 1060 is connected to a second end of the light emitting module 104, a second end of the voltage dividing module 1060 is grounded, a first end of the first switching device D1 is connected to the first end of the voltage dividing module 1060, and a second end of the first switching device D1 is connected to the second end of the voltage dividing module 1060, wherein the first switching device D1 is capable of being turned on when a voltage value of the power supply signal is less than or equal to a preset voltage value, and is turned off when the voltage value of the power supply signal is greater than the preset voltage value.
In this embodiment, although the introduction of the voltage dividing module 106 can reduce the probability that the driving module 102 triggers the over-temperature protection, the introduction of the voltage dividing module 106 may affect the power of the light emitting circuit, such as increasing the operating power of the light emitting circuit. The embodiment of the present application defines that the voltage dividing module 106 includes the voltage dividing module 1060 and the first switching device D1, and the first switching device D1 is utilized to define the working scenario of the voltage dividing module 1060, so as to ensure that the voltage dividing module 106 plays a role in reducing the heat generation of the driving module 102, and when the probability of triggering the over-temperature protection is reduced, the light emitting circuit can be ensured to operate according to a better power.
Specifically, the first end of the first switch device D1 is connected to the first end of the voltage dividing module 1060, and the second end of the first switch device D1 is connected to the second end of the voltage dividing module 1060, that is, whether the voltage dividing module 1060 is connected to the light emitting module 104 is realized by whether the first switch device D1 is turned on or not, based on the above connection relationship, the light emitting circuit can be applied to different usage scenarios, thereby ensuring that the voltage dividing module 106 plays a role in reducing the heat generated by the driving module 102, and reducing the probability of triggering the over-temperature protection, and ensuring that the light emitting circuit can operate according to a better power.
In particular, the voltage V of the supply signalbat＝Vheadroom+Vron+Vf+VledWherein V isheadroomIs the voltage drop when the MOS transistor (i.e., Metal-Oxide-Semiconductor Field-effect transistor) in the driving module 102 is turned on; vronIs the voltage drop on the internal and external traces of the driver module 102; vfIs the voltage drop across the voltage divider module 106, VledIs the voltage drop of the light-emitting module 104 during operation, and V is the voltage drop of the light-emitting module 104 when the driving current on the light-emitting module 104 meets the operation requirementledThe smaller the power loss on the light emitting module 104, the smaller the voltage dividing module 106 can reduce V while ensuring the power loss on the light emitting module 104 is smallerheadroomSo as to stabilize the junction temperature of the MOS transistor on the light-emitting module 104 and reduce the probability of triggering the over-temperature protection function.
Based on this, under the condition that the voltage value of the power supply signal is greater than the preset voltage value, the driving module 102 works in the Bypass mode, at this time, the first switching device D1 is in the off state, at this time, the voltage division module 1060 plays a role in reducing the heat generation of the driving module 102, and the light emitting circuit is ensured to operate according to a better power while the probability of triggering the over-temperature protection is reduced.
And under the condition that the voltage value of the power supply signal is less than or equal to the preset voltage value, the driving module 102 works in a Boost mode, the first switching device D1 is in a conducting state, and at the moment, the first switching device D1 short-circuits the voltage division module 1060, so that the power consumption of the light-emitting circuit is reduced.
In some embodiments, the voltage divider module 106 further comprises: the first inductor L1 and the first inductor L1 are connected in series between the first terminal of the first switching device D1 and the first terminal of the voltage dividing module 1060.
In this embodiment, the first inductor L1 is configured to store at least a portion of energy by using the first inductor L1 when the driving module 102 operates in the Bypass mode, so that the stored energy is used to power the subsequent circuit when the light emitting module 104 stops operating.
In some embodiments, the voltage divider module 106 further comprises: the first diode D2, the anode of the first diode D2 is grounded, and the cathode of the first diode D2 is connected to the second terminal of the light emitting module 104.
In this embodiment, by providing the first diode D2, the energy stored in the first inductor L1 is released by the first diode D2, so as to avoid that the energy stored in the first inductor L1 cannot be discharged without a subsequent circuit, which may damage the light emitting circuit, that is, the stability of the light emitting circuit is improved by the provision of the first diode D2.
In some embodiments, the voltage divider module 106 further comprises: a first end of the first capacitor C1 and a first end of the first capacitor C1 are connected to a first end of the voltage dividing module 1060, and a second end of the first capacitor C1 is connected to a second end of the voltage dividing module 1060.
In this embodiment, the first capacitor C1 is utilized to store at least part of the energy, and the first capacitor C1 can also be used as a power supply terminal for supplying power to the subsequent circuit, for example, the first power supply terminal and the second power supply terminal of the subsequent circuit are respectively connected to the first terminal and the second terminal of the first capacitor C1, so as to meet the power supply requirement of the lighting circuit for supplying power to the subsequent circuit.
In some embodiments, the voltage divider module 106 further comprises: and a second switching device D3, the second switching device D3 being connected in series between the first terminal of the voltage dividing module 1060 and the first terminal of the first capacitor C1, wherein the second switching device D3 is capable of controlling the voltage dividing module 1060 to supply power to the first capacitor C1.
In this embodiment, the second switching device D3 is arranged to control whether the first capacitor C1 stores energy and supplies power to the subsequent circuit, that is, whether the light emitting circuit supplies power to the subsequent circuit, so that the light emitting circuit can adapt to different usage scenarios.
In some of these embodiments, the first switching device D1 and the second switching device D3 may be used in combination to enable the lighting circuit to adapt to different usage scenarios.
Specifically, as shown in fig. 2, under the condition that the voltage value of the power supply signal is greater than the preset voltage value, the driving module 102 operates in the Bypass mode, the light emitting module 104 starts to operate to emit light, at this time, the first switching device D1 and the second switching device D3 are controlled to be in the off state, at this time, the power supply signal passes through the driving module 102, the light emitting module 104 and the voltage dividing module 1060 and then is grounded, the voltage dividing module 1060 can share part of the voltage drop and heat of the driving module 102, thereby avoiding the over-temperature protection function triggered by the over-high temperature of the driving module 102, and finally causing the light emitting module 104 to stop operating, and at the same time, the first inductor L1 is used to store energy so as to supply power to the rear-stage circuit when the light emitting module 104 stops operating.
As shown in fig. 3, when the voltage value of the power supply signal is less than or equal to the preset voltage value, the driving module 102 operates in the Boost mode, the light emitting module 104 starts to operate, and in order to ensure that the light emitting circuit maintains higher operating efficiency, the first switching device D1 is controlled to be turned on, and the second switching device D3 is controlled to be turned off, at this time, the power consumption of the light emitting circuit can be minimized; as shown in fig. 4, when the light emitting module 104 stops operating, the first switching device D1 is in an off state, and the second switching device D3 is in an on state, at this time, the energy stored in the first inductor L1 can be discharged through the first diode D2 and the second switching device D3 so as to supply power to the subsequent circuit.
In some embodiments, a control method of the first switching device D1 and the second switching device D3 is specifically provided, and specifically, as shown in fig. 5, the control method includes:
step 502, waiting for a light emitting module triggering event to be generated in a standby working state;
step 504, detecting the voltage V of the power supply signalbatWith a predetermined voltage value VTHVoltage difference value Vd；
Step 506, judge VdMagnitude relation with 0, at VdIf greater than 0, go to step 508; e.g. at VdIf the value is less than or equal to 0, go to step 510;
step 508, controlling the first switching device and the second switching device to be cut off;
step 510, controlling the first switching device to be switched on, and controlling the second switching device to be switched off;
step 512, determining whether the light emitting module stops operating, if yes, executing step 514, and if no, executing step 504;
step 514, judging whether the post-stage output is needed, if so, executing step 516, and if not, executing step 502;
in step 516, the first switching device is controlled to be turned off, and the second switching device is controlled to be turned on.
In one embodiment, step 514 is repeatedly performed to achieve continuous control of the lighting circuit in step 516.
In some embodiments, the voltage divider module 1060 includes a resistor.
In this embodiment, a specific expression of the voltage dividing module 1060 is specifically defined, where the voltage dividing module 1060 may be a circuit exhibiting resistive characteristics, such as a resistor, or may be another circuit having semiconductor characteristics, such as a MOS transistor.
In some embodiments, as shown in fig. 6, the voltage dividing module 106 includes at least two voltage dividing branches, each of which includes a voltage dividing resistor R and a third switching device D4, a first end of the voltage dividing resistor R is connected to the second end of the light emitting module 104, a second end of the voltage dividing resistor R is connected to the first end of the third switching device D4, and a second end of the third switching device D4 is grounded, wherein the resistance values of the voltage dividing resistors R on the at least two voltage dividing branches are different.
In this embodiment, a representation of the voltage dividing module 106 is specifically defined, and specifically, the voltage dividing module 106 includes at least two voltage dividing branches, where each voltage dividing branch includes a voltage dividing resistor R and a third switching device D4. The voltage dividing resistor R and the third switching device D4 are connected in series, wherein the third switching device D4 is used to control whether the voltage dividing branch where the voltage dividing resistor R is located is connected in series between the light emitting module 104 and the ground, so as to share part of the voltage drop and heat of the driving module 102 by using the voltage dividing resistor R and the third switching device D4, thereby preventing the light emitting module 104 from stopping working due to the over-temperature protection function triggered by the over-high temperature of the driving module 102, and thus improving the stability of the operation of the light emitting circuit.
The resistance values of the divider resistors R on the at least two groups of voltage dividing branches are different, so that the light-emitting circuit can select a proper voltage dividing branch to be conducted according to an actual use scene, the light-emitting circuit can adapt to different power supply signals, and the running stability of the light-emitting circuit is improved.
In some embodiments, the resistances of the voltage dividing resistors R in the at least two sets of voltage dividing branches are sequentially increased, wherein the minimum resistance of the voltage dividing resistor R may be zero, so as to meet the use requirements of the light emitting circuit in different use scenarios.
In some of these embodiments, further comprising: and the control module 108 is connected with the third switching device D4 and is configured to control a conducting state of the third switching device D4 according to a comparison result between a voltage value of the power supply signal and a preset voltage value.
In this embodiment, the third switching device D4 on any voltage dividing branch is controlled by the control module 108, which is related to the comparison result of the voltage value according to the power supply signal and the preset voltage value, so that the automatic control of the third switching device D4 can be realized to realize the automatic control of the light emitting circuit.
In some of these embodiments, further comprising: and the voltage acquisition circuit 110 is respectively connected with the at least two groups of voltage division branches and is used for acquiring a voltage signal of each voltage division branch, wherein the control module 108 is connected with the voltage acquisition circuit 110 module and is used for selecting a target voltage division branch from the at least two groups of voltage division branches according to the voltage signal of each voltage division branch and controlling the conduction of a third switching device D4 in the target voltage division branch.
In this embodiment, the light emitting circuit is further limited to include a voltage collecting circuit 110, wherein the voltage collecting circuit 110 is capable of collecting a voltage signal on each voltage dividing branch, so as to select a target voltage dividing branch from at least two groups of voltage dividing branches according to the voltage signal of each voltage dividing branch, and control the third switching device D4 in the target voltage dividing branch to be turned on, that is, select an optimal voltage dividing branch to be connected in series between the light emitting module 104 and the ground, so as to share a portion of the voltage drop and heat of the driving module 102, avoid triggering an over-temperature protection function due to an over-high temperature of the driving module 102, and ensure that the light emitting circuit can operate according to a better power.
Specifically, the target voltage dividing branch is determined according to the maximum voltage drop VT that the driving module 102 can accept.
In some embodiments, as shown in fig. 7, the control logic of the lighting circuit includes:
step 702, waiting for a trigger event of the light emitting module to be generated in a standby state;
step 704, detecting the voltage amplitude of the power supply signal at this time, and accordingly judging the working state of the driving module;
step 706, determining the voltage V of the power supply signalbatWith a predetermined voltage value VTHIn the magnitude relation of voltage of VbatLess than or equal to VTHIn the case of (3), step 708 is executed, at VbatGreater than VTHIn case of (3), step 710 is performed;
step 708, controlling a first voltage dividing branch of the at least two groups of voltage dividing branches to be conducted;
step 710, controlling a Kth voltage dividing branch in the at least two groups of voltage dividing branches to be conducted;
step 712, detecting the voltage signal of the divider resistor R, and calculating the voltage drop V when the MOS transistor in the driving module is turned onheadroom；
Step 714, judge VheadroomIf the value is smaller than VT, if yes, go to step 716, if no, go to step 718;
step 716, wait for the light emitting module to stop working;
step 718, controlling the voltage dividing branch of the K +1 th voltage dividing branch of the at least two groups of voltage dividing branches to be conducted, and executing step 712.
In one embodiment, the preset voltage value VTHThe voltage value for switching the driving module 102 from Boost mode to Bypass mode.
In some of these embodiments, further comprising: the second inductor L2, the second inductor L2 is connected to the input terminal of the driving module 102, and is configured to receive a power supply signal and input the power supply signal to the driving module 102.
In this embodiment, the second inductor L2 is used to store the energy of the driving module 102 in the Boost mode, so as to ensure that the light emitting module 104 can normally operate when the voltage value of the power supply signal is less than or equal to the preset voltage value.
In some of these embodiments, further comprising: a first end of the second capacitor C2 and a first end of the second capacitor C2 are connected to the second output end of the driving module 102, and a second end of the second capacitor C2 is grounded.
In this embodiment, the second capacitor C2 may serve as a load for the driving module 102 in the Boost mode, so as to ensure stability of the driving module 102 in the Boost mode.
In some embodiments, as shown in fig. 8, the driving module 102 specifically includes: crystal oscillator circuit 1020, excessive temperature protection circuit 1021, preceding stage drive circuit 1022, current limiting circuit 1023, feedback circuit 1024, comparator 1025, first switch tube 1026, second switch tube 1027, first current source 1028 and second current source 1029.
Fig. 8 shows a specific connection relationship among the crystal oscillator circuit 1020, the over-temperature protection circuit 1021, the preceding stage driving circuit 1022, the current limiting circuit 1023, the feedback circuit 1024, the comparator 1025, the first switching tube 1026, the second switching tube 1027, the first current source 1028, and the second current source 1029, wherein the crystal oscillator circuit 1020 provides a reference operating frequency for the following stage circuit to ensure the normal operation of the driving module 102; the over-temperature protection circuit 1021 is used for controlling the driving module 102 to stop working when the temperature of the driving module 102 is too high, so as to prevent the driving module 102 from being damaged due to the too high temperature; the front-stage driving circuit 1022 outputs pulse width modulation signals with different duty ratios to obtain output voltages with different amplitudes; the current limiting circuit 1023 is used for collecting the current of a switching tube on an input loop of the Boost circuit to limit the maximum output current; the feedback circuit 1024 is used for sampling negative feedback to obtain stable output voltage; the comparator 1025 is used for comparing the output voltage with a reference voltage to prevent the external circuit from damaging the driving module 102 due to too high output voltage caused by short circuit or other reasons, the first switching tube 1026 and the second switching tube 1027 are two switching tubes of a Boost circuit, and the first current source 1028 and the second current source 1029 are used for providing a constant bias current for the light emitting module 104.
In some embodiments, an electronic device is provided, comprising: a light emitting circuit as claimed in any one of the preceding claims.
In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims (12)

1. A light emitting circuit, comprising:
the driving module is used for receiving a power supply signal and driving the light-emitting module to operate according to the power supply signal;
the first end of the light-emitting module is connected with the first output end of the driving module;
a voltage division module, wherein the first end of the voltage division module is connected with the second end of the light emitting module, the second end of the voltage division module is grounded,
the voltage division module is suitable for reducing the voltage reduction amplitude of the power supply signal on the driving module.
2. The circuit of claim 1, wherein the voltage divider module comprises:
the first end of the voltage division module is connected with the second end of the light-emitting module, and the second end of the voltage division module is grounded;
a first switch device, a first end of the first switch device being connected to a first end of the voltage division module, a second end of the first switch device being connected to a second end of the voltage division module,
the first switching device can be in a conducting state when the voltage value of the power supply signal is smaller than or equal to a preset voltage value, and can be in a stopping state when the voltage value of the power supply signal is larger than the preset voltage value.
3. The light emitting circuit of claim 2, wherein the voltage divider module further comprises:
the first inductor is connected between the first end of the first switching device and the first end of the voltage division module in series.
4. The light emitting circuit of claim 3, wherein the voltage divider module further comprises:
and the anode of the first diode is grounded, and the cathode of the first diode is connected with the second end of the light-emitting module.
5. The light emitting circuit of claim 2, wherein the voltage divider module further comprises:
and the first end of the first capacitor is connected with the first end of the voltage division module, and the second end of the first capacitor is connected with the second end of the voltage division module.
6. The light emitting circuit of claim 5, wherein the voltage divider module further comprises:
a second switching device connected in series between a first terminal of the voltage division module and a first terminal of the first capacitor,
the second switch device can control the voltage division module to supply power to the first capacitor.
7. The light-emitting circuit according to claim 1, wherein the voltage-dividing module comprises at least two sets of voltage-dividing branches, each of the voltage-dividing branches comprises a voltage-dividing resistor and a third switching device,
under each voltage dividing branch, a first end of the voltage dividing resistor is connected with a second end of the light emitting module, a second end of the voltage dividing resistor is connected with a first end of the third switching device, a second end of the third switching device is grounded,
the resistance values of the voltage dividing resistors on at least two groups of voltage dividing branches are different.
8. The light emitting circuit of claim 7, further comprising:
and the control module is connected with the third switching device and used for controlling the conducting state of the third switching device according to the comparison result of the voltage value of the power supply signal and a preset voltage value.
9. The light emitting circuit of claim 8, further comprising:
the voltage acquisition circuit is respectively connected with at least two groups of voltage division branches and is used for acquiring a voltage signal of each voltage division branch,
the control module is connected with the voltage acquisition circuit module and used for selecting a target voltage division branch from at least two groups of voltage division branches according to a voltage signal of each voltage division branch and controlling a third switching device in the target voltage division branch to be conducted.
10. The light-emitting circuit according to any one of claims 1 to 9, further comprising:
and the second inductor is connected with the input end of the driving module and used for receiving the power supply signal and inputting the power supply signal to the driving module.
11. The light emitting circuit of claim 10, further comprising:
and the first end of the second capacitor is connected with the second output end of the driving module, and the second end of the second capacitor is grounded.
12. An electronic device, comprising:
a light emitting circuit as claimed in any one of claims 1 to 11.
CN202122232215.4U 2021-09-15 2021-09-15 Light emitting circuit and electronic device Active CN215529380U (en)

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CN202122232215.4U CN215529380U (en) 2021-09-15 2021-09-15 Light emitting circuit and electronic device

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