LED flash lamp control circuit and lighting equipment

Abstract

The utility model discloses an LED flash lamp control circuit and lighting equipment, the circuit comprises an LED lamp bead, a first power supply, an energy storage module, a second power supply and a switch module, and the switch module comprises a first switch unit and a second switch unit; the first switch unit is connected between the energy storage module and the LED lamp bead, and the second switch unit is connected with the LED lamp bead; the switch module is used for controlling the conduction of the target access according to a switch control signal corresponding to the target light-emitting mode, so that the LED lamp bead works in the target light-emitting mode based on the target access; the first switch unit is used for controlling the connection state of a first path where the energy storage module and the LED lamp beads are located; the second switch unit is used for controlling the connection state of a second path where the second power supply and the LED lamp beads are located. According to the technical scheme, switching of the light emitting modes of the LED flash lamp is controlled through one control circuit, and therefore the structure of the control circuit of the LED flash lamp is simplified on the premise that the control effect is guaranteed.

Description

Technical Field

[0001] This application belongs to the field of lighting control technology, specifically relating to an LED flash control circuit and lighting equipment. Background Technology

[0002] An LED flash is a photographic auxiliary device used to provide additional light sources in low-light conditions to achieve better exposure. To adapt to the lighting needs of different shooting scenarios, LED flash units typically incorporate LEDs with multiple operating modes, each emitting light differently. These LEDs operating in different modes are usually independent of each other, and their control circuits are also independent. For example, switching from one operating mode to another usually involves turning off the corresponding LED in the control circuit of the previous mode, and then turning on the corresponding LED in the control circuit of the new mode. This control method requires configuring multiple control circuits for different modes and corresponding LEDs, resulting in a complex overall circuit structure and a relatively large overall size for the LED flash.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] The purpose of this application is to provide an LED flash control circuit and lighting device to simplify the control circuit structure of an LED flash.

[0005] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0006] According to one aspect of the embodiments of this application, an LED flash control circuit is provided, comprising:

[0007] LED beads;

[0008] The first power supply is used to provide the first power supply voltage;

[0009] An energy storage module is connected to the first power supply and is used to store the energy required for the LED beads to emit light through the first power supply.

[0010] A second power supply is connected to the LED beads to provide a second power supply voltage; wherein the first power supply voltage is greater than the second power supply voltage;

[0011] The switching module includes a first switching unit and a second switching unit; the first switching unit is connected between the energy storage module and the LED lamp bead, and the second switching unit is connected to the LED lamp bead; the switching module is used to control the target path to be turned on according to the switching control signal corresponding to the target light emission mode, so that the LED lamp bead works in the target light emission mode based on the target path.

[0012] The first switching unit is used to control the connection state of the energy storage module and the LED beads in the first path; the second switching unit is used to control the connection state of the second power supply and the LED beads in the second path; the target path is one of the first path and the second path.

[0013] In one embodiment of this application, it further includes:

[0014] A flash control module, connected to the LED beads, is used to control the strobe of the LED beads according to a flash control signal, which is generated based on the target flash power when the LED beads are operating in the target light emission mode.

[0015] In one embodiment of this application, it further includes:

[0016] The current suppression module has one end connected to the common connection terminal of the LED bead and the second switching unit, and the other end connected to the flash control module, and is used to suppress the instantaneous current in the path where the LED bead is located;

[0017] The absorption module has one end connected to the common connection terminal of the current suppression module and the flash control module, and the other end connected to the common connection terminal of the first switching unit and the LED beads, and is used to absorb the energy released by the current suppression module.

[0018] In one embodiment of this application, it further includes:

[0019] A current suppression module is connected between the first switching unit and the LED bead, and is used to suppress the instantaneous current in the path where the LED bead is located;

[0020] The absorption module has one end connected to the common connection terminal of the current suppression module and the flash control module, and the other end connected to the common connection terminal of the first switching unit and the current suppression module, and is used to absorb the energy released by the current suppression module.

[0021] In one embodiment of this application, it further includes:

[0022] The current suppression module is connected at one end to the LED lamp bead and at the other end to the common connection terminal of the second switching unit and the flash control module, and is used to suppress the instantaneous current in the path where the LED lamp bead is located.

[0023] The absorption module has one end connected to the common connection terminal of the current suppression module and the flash control module, and the other end connected to the common connection terminal of the first switching unit and the current suppression module, and is used to absorb the energy released by the current suppression module.

[0024] In one embodiment of this application, the flash control module is the second switching unit, and the circuit further includes:

[0025] A current suppression module is connected between the first switching unit and the LED bead, and is used to suppress the instantaneous current in the path where the LED bead is located;

[0026] The absorption module has one end connected to the common connection terminal of the LED bead and the second switching unit, and the other end connected to the common connection terminal of the first switching unit and the current suppression module, and is used to absorb the energy released by the current suppression module.

[0027] In one embodiment of this application, it further includes:

[0028] An isolation module is connected between the second power supply and the current suppression module to isolate the second power supply and the LED beads.

[0029] In one embodiment of this application, it further includes:

[0030] An isolation module is connected between the second power supply and the LED beads to isolate the second power supply and the LED beads.

[0031] According to one aspect of the embodiments of this application, a lighting device is provided, comprising:

[0032] Two or more LED light groups, one of the LED light groups including at least one LED flash bead;

[0033] Two or more LED flash control circuits are provided, one LED light group is provided in one LED flash control circuit, and multiple LED flash control circuits are connected in parallel. The LED flash control circuit is the LED flash control circuit provided in any embodiment of this application.

[0034] In one embodiment of this application, each of the LED light groups emits a different color.

[0035] In the technical solution provided in this application embodiment, the LED flash control circuit includes: LED beads, a first power supply, an energy storage module, a second power supply, and a switching module. The switching module includes a first switching unit and a second switching unit. The first switching unit is connected between the energy storage module and the LED beads, and the second switching unit is connected to the LED beads. The switching module is used to control the conduction of the target path according to the switching control signal corresponding to the target light emission mode, so that the LED beads work in the target light emission mode based on the target path. The first switching unit is used to control the connection state of the energy storage module and the first path where the LED beads are located. The second switching unit is used to control the connection state of the second power supply and the second path where the LED beads are located. In this way, when the target light emission mode is different, the corresponding target path is different, and the LED beads can work in the target light emission mode based on the target path. This realizes the switching of the LED flash light emission mode through a single control circuit, thereby simplifying the control circuit structure of the LED flash while ensuring the control effect. Furthermore, the same set of LED beads can work in different light emission modes as needed, thus eliminating the need to configure different LED beads for each light emission mode, which is beneficial to reducing the overall size of the LED flash.

[0036] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0038] Figure 1 A schematic block diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0039] Figure 2 A schematic block diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0040] Figure 3A A schematic diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0041] Figure 3B A schematic diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0042] Figure 3CA schematic diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0043] Figure 4A A schematic diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0044] Figure 4B A schematic diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0045] Figure 5 A schematic block diagram of a lighting device provided in one embodiment of this application is shown. Detailed Implementation

[0046] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0047] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0048] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0049] Figure 1 A schematic block diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0050] like Figure 1As shown, the LED flash control circuit 100 provided in this embodiment includes an energy storage module 110, a switching module 120, LED beads, a first power supply 170, and a second power supply VCC. The energy storage module 110 is connected to the first power supply 170. The switching module 120 includes a first switching unit 121 and a second switching unit 122. The first switching unit 121 is connected between the energy storage module 110 and the LED beads, and the second switching unit 122 is connected to the LED beads. The LED beads are connected to the second power supply VCC. The first power supply voltage provided by the first power supply 170 is greater than the second power supply voltage provided by the second power supply VCC, which means that the power supply voltage output by the energy storage module 110 is greater than the power supply voltage output by the second power supply VCC.

[0051] The switching module 120 is used to control the target path to be turned on according to the switching control signal corresponding to the target light emission mode, so that the LED beads operate in the target light emission mode based on the target path. Specifically, the first switching unit 121 controls the connection state of the energy storage module 110 and the LED beads in the first path; the second switching unit 122 controls the connection state of the second power supply VCC and the LED beads in the second path; the target path is one of the first path and the second path. Therefore, when controlling the target path according to the target light emission mode, if the target path is determined to be the first path based on the target light emission mode, the first switching unit 121 is controlled to connect the energy storage module 110 and the LED beads in the first path; if the target path is determined to be the second path based on the target light emission mode, the second switching unit 122 is controlled to connect the second power supply VCC and the LED beads in the second path.

[0052] In this way, the target path is controlled by the switch control signal corresponding to the target light emission mode. When the target light emission mode is different, the corresponding target path is different. The LED beads can work in the target light emission mode based on the target path. This realizes the switching of the LED flash light emission mode through a single control circuit. This simplifies the control circuit structure of the LED flash while ensuring the control effect. Furthermore, the same set of LED flash beads can work in different light emission modes as needed, so there is no need to configure different LED beads for each light emission mode, which helps to reduce the overall size of the LED flash lighting equipment.

[0053] In one embodiment of this application, the LED flash lamp has two illumination modes: a flashing mode and a constant-on mode. Since the supply voltage output by the energy storage module 110 is greater than the supply voltage output by the second power supply VCC, and a higher voltage is required in the flashing mode, the LED beads are powered by the energy storage module 110 in the flashing mode, meaning that the first switching unit 121 is controlled to connect the first path in the flashing mode. In the constant-on mode, the LED beads are powered by the second power supply VCC, meaning that the second switching unit 122 is controlled to connect the second path in the constant-on mode.

[0054] In one embodiment of this application, based on the characteristics of a switch, when the first switch unit 121 or the second switch unit 122 is in a continuously open (or off) state, the corresponding path is disconnected; when the first switch unit 121 or the second switch unit 122 is in a continuously closed (or on) state, the corresponding path is connected (conducted). Therefore, when the target light-emitting mode is flashing mode, the first switch unit 121 can be controlled to remain on, so that the LED beads operate under the power supply of the energy storage module 110; when the target light-emitting mode is constant-on mode, the second switch unit 122 can be controlled to remain on, so that the LED beads operate under the power supply of the second power supply VCC. It is understandable that when the target light emission mode is flashing mode, while controlling the first switch unit 121 to be in a continuously conducting state, a flashing control signal can be sent to the second switch unit 122, causing the second switch unit 122 to be continuously turned on and off, thereby making the LED bulb work in flashing mode; similarly, when the target light emission mode is constant-on mode, while controlling the second switch unit 122 to be in a continuously conducting state, the first switch unit 121 should be controlled to be in a continuously off state, thereby making the LED bulb work in constant-on mode.

[0055] In one embodiment of this application, the first switching unit 121 and the second switching unit 122 may be switching devices such as MOSFETs, IGBTs, and transistors. The first switching unit 121 and the second switching unit 122 may also be a switching circuit composed of multiple circuit elements including at least one switching device. The circuit structure of the first switching unit 121 and the circuit structure of the second switching unit 122 may be the same or different.

[0056] Figure 2 A schematic block diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0057] like Figure 2As shown, the LED flash control circuit provided in this embodiment includes an energy storage module 110, a switch module 120, a flash control module 130, LED beads, a first power supply 170, and a second power supply VCC. The specific structures of the energy storage module 110 and the switch module 120 can be referred to the description in the previous embodiments, and will not be repeated here. The flash control module 130 is connected to the LED beads and is used to control the flashing of the LED beads according to the flash control signal. In fact, the flash control module 130 controls the intermittent emission of the LED beads. The flash control signal is generated based on the target flash power when the LED beads are operating in the target emission mode.

[0058] It should be noted that in flash mode, the first switching unit connects the energy storage module 110 and the first path where the LED beads are located. The flash control module 130 will cause the first path to be either connected or disconnected. Since the disconnection time is usually short and the connection and disconnection of the path is a necessary operation for the LED beads in this flash mode, the first path is still considered to be connected.

[0059] In one embodiment of this application, the flash control signal is a PWM (Pulse Width Modulation) signal.

[0060] In one embodiment of this application, the flash control module 130 may also be constructed using switching devices such as MOSFETs, IGBTs, and transistors, or be a switching circuit composed of multiple circuit elements including at least one switching device.

[0061] In one embodiment of this application, such as Figure 2 As shown, the LED flash control circuit 100 provided in this embodiment also includes a current suppression module 140, used to suppress the instantaneous current in the path where the LED is located. The current suppression module 140 can be disposed in the first path, for example, as shown in... Figure 2 As shown, one end of the current suppression module 140 is connected to the common connection terminal of the LED bead and the second switching unit 122, and the other end is connected to the flash control module. The current suppression module 140 can be an inductor or other circuit structure capable of suppressing the magnitude of instantaneous current.

[0062] In one embodiment of this application, such as Figure 2 As shown, the LED flash control circuit 100 provided in this embodiment also includes an absorption module 150, one end of which is connected to the common connection terminal of the current suppression module 140 and the flash control module 130, and the other end is connected to the common connection terminal of the first switching unit 121 and the LED beads, for absorbing the energy released by the current suppression module 140. The absorption module 150 can be composed of diodes, capacitors, resistors, or other circuit structures capable of absorbing energy.

[0063] In one embodiment of this application, such as Figure 2 As shown, the LED flash control circuit 100 provided in this embodiment also includes an isolation module 160, which is connected between the second power supply VCC and the LED beads, and is used to isolate the second power supply VCC and the LED beads. The isolation module 160 can be a diode or other circuit structure capable of achieving isolation.

[0064] Figure 3A A schematic diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0065] like Figure 3A As shown, the LED flash control circuit provided in this embodiment includes an energy storage module 110, a first switching unit 121, a second switching unit 122, a flash control module 130, a current suppression module 140, an absorption module 150, an isolation module 160, LED beads, a first power supply 170, and a second power supply VCC. The energy storage module 110 includes an energy storage capacitor, the first switching unit 121 includes a switching transistor 1, the second switching unit 122 includes a switching transistor 2, the flash control module 130 includes a switching transistor 3, the current suppression module 140 includes an inductor, and the isolation module 160 includes a diode.

[0066] The input terminal of the energy storage capacitor is connected to the first power supply 170, and the output terminal of the energy storage capacitor is connected to the first conducting terminal of switch transistor 1. The control terminal of switch transistor 1 is connected to the controller MCU to receive the first switch control signal, and the second conducting terminal of switch transistor 1 is connected to the LED. The second power supply VCC is connected to the LED through a diode. The control terminal of switch transistor 2 is connected to the controller MCU to receive the second switch control signal, and the first conducting terminal of switch transistor 2 is connected to the LED. The second conducting terminal of switch transistor 2 is grounded. One end of the inductor is connected to the LED, and the other end is connected to the first conducting terminal of switch transistor 3. The second conducting terminal of switch transistor 3 is grounded, and the control terminal of switch transistor 3 is connected to the controller MCU to receive the flashing control signal. One end of the absorption module 150 is connected to the common connection terminal of the inductor and switch transistor 3, and the other end is connected to the common connection terminal of switch transistor 1 and LED.

[0067] The first path consists of an energy storage capacitor, a switching transistor 1, LED beads, an inductor, a switching transistor 3, and an absorption module 150. When the target light emission mode is flashing mode, this first path is activated, supplying power to the LED beads through the energy storage capacitor (which is charged by the first power supply 170) to achieve flashing output. The second path consists of a second power supply VCC, a diode, LED beads, and a switching transistor 2. When the target light emission mode is constant-on mode, this second path is activated, supplying power to the LED beads through the second power supply VCC to achieve constant-on output.

[0068] The diode ensures that current flows from the second power supply VCC to the LED chip, preventing current from flowing back from the LED chip to the second power supply VCC, thus achieving isolation between the second power supply VCC and the LED chip.

[0069] The working principle of the LED flash control circuit is as follows:

[0070] 1. The controller MCU determines the target lighting mode of the LED flashlight based on the signal input by the user. The lighting modes include: flash mode and constant light mode.

[0071] 2.1 When the target light emission mode is flashing mode, the controller MCU outputs a second switch control signal to switch 2, so that switch 2 remains in a continuously off state (that is, the first and second conducting terminals of switch 2 are continuously disconnected, referred to as switch 2 continuously off), so as to prevent current from flowing through switch 2 to GND to achieve cutoff.

[0072] 2.2 Then, the controller MCU outputs the first switching control signal to switch 1, keeping switch 1 continuously conducting (i.e., the first and second conducting terminals of switch 1 are continuously conducting, referred to as switch 1 continuously conducting). At this time, the supply voltage of the energy storage capacitor passes through switch 1 to the LED and the inductor (the inductor can limit the instantaneous flashing current). At this time, the controller MCU sends a flashing control signal to switch 3. This flashing control signal is a PWM control signal. The duty cycle of the PWM control signal can characterize the light emission frequency. Therefore, the controller MCU generates a PWM signal with a corresponding duty cycle according to the target light emission frequency in the flashing mode and sends it to switch 3. When the PWM control signal is at a low level, switch 3 is in the off state, and the energy stored in the inductor needs to be released through the absorption module 150, so that the current on the LED can continue. When the PWM control signal is at a high level, switch 3 is in the conducting state, and the current flows through switch 3 to GND. Thus, during the control period of the PWM control signal, the LED emits light with a constant current output.

[0073] It should be noted that when the switching transistor 3 is in the on state, the second power supply VCC, diode, LED, inductor and switching transistor 3 can form a circuit. Since the supply voltage output by the energy storage capacitor is much greater than the supply voltage output by the second power supply VCC, the influence of the second power supply VCC on the power supply of the LED can be ignored in the first circuit.

[0074] 2.3 After the controller MCU receives the control signal to end the flash, the MCU sends a shutdown signal to switch 3, and then shuts down switch 1, and then waits for the next control (optionally, switch 1 can be shut down first and then switch 3, or both can be shut down simultaneously). The control signal to end the flash is set according to preset conditions, which may include: sending the control signal to end the flash when the energy storage capacitor's charge is less than a predetermined value; or sending the control signal to end the flash when the operating time of switch 3 reaches a predetermined value.

[0075] 3.1 When the target light-emitting mode is constant-on mode, the controller MCU outputs a first switch control signal to switch 1, keeping switch 1 continuously off. At this time, the LED is powered by the second power supply VCC. Current flows through the diode and the LED, and then the controller MCU outputs a second switch control signal to switch 2, causing current to flow through switch 2 to GND, achieving a constant-on effect for the LED. The second switch control signal can be a signal that keeps switch 2 continuously on, such as a fixed high-level signal, or a PWM signal, which enables the LED to emit light with a constant current output.

[0076] When the light emission end signal is received, the controller MCU outputs a second switch control signal to switch 2, so that switch 2 remains in the normally closed state and waits for the next control.

[0077] Figure 3B A schematic diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0078] Figure 3B The circuit structure shown is similar to Figure 3A The circuit structures shown are similar, the difference being the connection position of the current suppression module 140. Figure 3B The LED flash control circuit shown is to Figure 3A In the LED flash control circuit shown, the positions of the current suppression module 140 and the LED bead have been swapped, so that the current suppression module 140 is connected between the first switching unit 121 and the LED bead, one end of the absorption module 150 is connected to the common connection terminal of the current suppression module 140 and the flash control module 130, and the other end is connected to the common connection terminal of the first switching unit 121 and the current suppression module 140. Figure 3B The other circuit structures and working principles of the LED flash control circuit shown are the same as those of the other circuit structures shown. Figure 3A The control circuit for the LED flash is the same as shown, so it will not be described again here.

[0079] Figure 3C A schematic diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0080] Figure 3C The circuit structure shown is similar to Figure 3A The circuit structures shown are similar, the difference being the connection position of the current suppression module 140. Figure 3C The LED flash control circuit shown is to Figure 3A In the LED flash control circuit shown, the current suppression module 140 is moved between the LED chip and the second switching unit 122, which can also be seen as moving the second switching unit 122 after the current suppression module 140. At this time, one end of the current suppression module 140 is connected to the LED chip, and the other end is connected to the common connection terminal of the second switching unit 122 and the flash control module 130; one end of the absorption module 150 is connected to the common connection terminal of the current suppression module 140 and the flash control module 130, and the other end is connected to the common connection terminal of the first switching unit 121 and the current suppression module 140. Figure 3C The other circuit structures and working principles of the LED flash control circuit shown are the same as those of the other circuit structures shown. Figure 3A The control circuit for the LED flash is the same as shown, so it will not be described again here.

[0081] It should be noted that, in Figure 3C In the circuit structure shown, the first path still includes an energy storage capacitor, switch 1, LED beads, inductor, switch 3, and absorption module 150; the second path includes a second power supply VCC, diode, LED beads, inductor, and switch 2, and... Figure 3A or Figure 3B Compared to the circuit structure shown, an inductor is added to the second path. The inductor does not affect the LED beads from achieving the constant-on mode, but it makes the current change in the second path more gradual in the constant-on mode.

[0082] The LED flash control circuit provided in this application embodiment can control and switch between two light-emitting modes, flashing and constant light, for the same group of LED beads. Therefore, there is no need to set up separate LED beads for flashing and LED beads for constant light, as well as their corresponding control circuits, in the lighting equipment. This effectively reduces the complexity of the circuit structure and the number of LED beads, thereby reducing the size of the lighting equipment and promoting the miniaturization of the lighting equipment.

[0083] In one embodiment of this application, the function of the flash control module can be implemented by a second switching unit. That is, the second switching unit can be used to control both the connection state of the second power supply and the second path containing the LED beads, and to control the flickering of the LED beads. The circuit structure in this case is described below with a specific embodiment.

[0084] Figure 4A A schematic diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0085] like Figure 4A As shown, the LED flash control circuit provided in this embodiment includes an energy storage module 110, a first switching unit 121, a second switching unit 122, a current suppression module 140, an absorption module 150, an isolation module 160, LED beads, a first power supply 170, and a second power supply VCC. The energy storage module 110 includes an energy storage capacitor, the first switching unit 121 includes a switching transistor 1, the second switching unit 122 includes a switching transistor 2, the current suppression module 140 includes an inductor, and the isolation module 160 includes a diode.

[0086] The input terminal of the energy storage capacitor is connected to the first power supply 170, and the output terminal of the energy storage capacitor is connected to the first conducting terminal of the switching transistor 1. The control terminal of the switching transistor 1 is connected to the controller MCU to receive the first switching control signal, and the second conducting terminal of the switching transistor 1 is connected to the LED. The second power supply VCC is connected to the LED through a diode. The control terminal of the switching transistor 2 is connected to the controller MCU to receive the second switching control signal, and the first conducting terminal of the switching transistor 2 is connected to the LED. The second conducting terminal of the switching transistor 2 is grounded. One end of the inductor is connected to the second conducting terminal of the switching transistor 1, and the other end is connected to the LED. One end of the absorption module 150 is connected to the common connection terminal of the inductor and the switching transistor 1, and the other end is connected to the common connection terminal of the switching transistor 2 and the LED.

[0087] The first path consists of an energy storage capacitor, a switching transistor 1, LED beads, an inductor, a switching transistor 2, and an absorption module 150. When the target light emission mode is flashing mode, this first path is activated, supplying power to the LED beads through the energy storage capacitor (equivalent to the first power supply 170) to achieve flashing output. The second path consists of a second power supply VCC, a diode, LED beads, and a switching transistor 2. When the target light emission mode is constant-on mode, this second path is activated, supplying power to the LED beads through the second power supply VCC to achieve constant-on output.

[0088] The working principle of the LED flash control circuit is as follows:

[0089] 1. The controller MCU determines the target light-emitting mode of the LED beads based on the signal input by the user. The light-emitting modes of the LED beads include: flashing mode and constant light mode.

[0090] 2.1 When the target light emission mode is flashing mode, the controller MCU outputs the first switch control signal to switch 1, keeping switch 1 in the normally open state. At this time, the supply voltage of the energy storage capacitor flows through switch 1 to the LED and inductor. Simultaneously, the controller MCU sends a flashing control signal to switch 2, which is a PWM control signal. When the PWM control signal is low, switch 2 is in the off state, and the energy stored in the inductor needs to be released through the absorption module 150, thus ensuring continuous current flow to the LED. When the PWM control signal is high, switch 2 is in the on state, and current flows through switch 2 to GND, causing the LED to emit light. Therefore, regardless of whether switch 2 is in the off or on state, there is a current signal in the circuit containing the LED, thus achieving constant current output light emission during the PWM control period.

[0091] It should be noted that when the switching transistor 2 is in the on state, the second power supply VCC, diode, LED, inductor and switching transistor 2 can form a circuit. Since the supply voltage output by the energy storage capacitor is much greater than the supply voltage output by the second power supply VCC, the influence of the second power supply VCC on the power supply of the LED can be ignored in the first circuit.

[0092] 2.2 When the controller MCU receives the control signal to end the flash, the MCU sends a shutdown signal to switch 2, and then shuts down switch 1, and then waits for the next control (optionally, switch 1 can be shut down first and then switch 2, or both can be shut down simultaneously). The control signal to end the flash is set according to preset conditions, which may include: sending the control signal to end the flash when the energy storage capacitor's charge is less than a predetermined value; or sending the control signal to end the flash when the operating time of switch 2 reaches a predetermined value.

[0093] 3.1 When the target light-emitting mode is constant-on mode, the controller MCU outputs a first switch control signal to switch 1, keeping switch 1 in a normally closed state. At this time, the LED is powered by the second power supply VCC. Current flows through the diode and the LED, and then the controller MCU outputs a second switch control signal to switch 2, causing current to flow through switch 2 to GND, achieving a constant-on effect for the LED. This second switch control signal can be a signal that keeps switch 2 continuously conducting, such as a fixed high-level signal, or a PWM signal, which enables the LED to emit light with a constant current output. When a light-emitting end signal is received, the controller MCU outputs a second switch control signal to switch 2, keeping switch 2 continuously off, waiting for the next control.

[0094] Figure 4A The circuit structure shown is compared to Figure 3A The circuit structure shown eliminates the need for a separate flash control module 130, resulting in fewer circuit components and a simpler circuit structure.

[0095] Figure 4B A schematic diagram of an LED flash control circuit provided in one embodiment of this application is shown.

[0096] Figure 4B The circuit structure shown is similar to Figure 4A The circuit structures shown are similar, the difference being the connection position of the isolation module 160. Figure 4B The LED flash control circuit shown is to Figure 4A In the LED flash control circuit shown, the isolation module 160 is moved before the current suppression module 140, so that the isolation module 160 is connected between the second power supply VCC and the current suppression module 140. Figure 4B The other circuit structures and working principles of the LED flash control circuit shown are the same as those of the other circuit structures shown. Figure 4A The control circuit for the LED flash is the same as shown, so it will not be described again here.

[0097] It should be noted that, in Figure 4B In the circuit structure shown, the first path still includes an energy storage capacitor, switch 1, LED beads, inductor, switch 2, and absorption module 150; the second path includes a second power supply VCC, diode, LED beads, inductor, and switch 2, and... Figure 4A Compared to the circuit structure shown, an inductor is added to the second path. The inductor does not affect the LED beads from achieving the constant-on mode, but it makes the current change in the second path more gradual in the constant-on mode.

[0098] The LED flash control circuit provided in this application embodiment can control and switch between two light-emitting modes, flashing and constant light, for the same group of LED beads. Therefore, there is no need to set up separate LED beads for flashing and LED beads for constant light, as well as their corresponding control circuits, in the lighting equipment. This effectively reduces the complexity of the circuit structure and the number of LED beads, thereby reducing the size of the lighting equipment and promoting the miniaturization of the lighting equipment.

[0099] Figure 5 A schematic block diagram of a lighting device provided in one embodiment of this application is shown.

[0100] like Figure 5 As shown, the lighting device 500 provided in this application embodiment includes multiple sets of LED beads and multiple LED flash control circuits 100. Each set of LED beads includes at least one LED bead. Each LED flash control circuit 100 is provided with a set of LED beads. Multiple LED flash control circuits 100 are connected in parallel. The LED flash control circuit 100 is the LED flash control circuit provided in any embodiment of this application. That is, in the LED flash control circuit provided in the above embodiments, the number of LED beads is at least one. At least one LED bead can be connected in parallel or in series to form an LED light group.

[0101] The lighting equipment provided by this application can use the same LED light group and its control circuit to achieve a variety of light emission modes, effectively reducing the number of LED beads and control circuits in the lighting equipment, thereby reducing the size of the lighting equipment, saving the manufacturing cost of the lighting equipment, and enabling the lighting equipment to develop in the direction of lightweighting.

[0102] In one embodiment of this application, each LED group emits a different color, thus enabling multi-color temperature control of the LED beads. For example, if one LED group uses cool-light beads and another uses warm-light beads, the cool / warm light adjustment of the LED beads can be achieved by connecting the two control circuits in parallel.

[0103] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0104] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0105] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. An LED flash control circuit, characterized in that, include: LED beads; The first power supply is used to provide the first power supply voltage; An energy storage module is connected to the first power supply and is used to store the energy required for the LED beads to emit light through the first power supply. A second power supply is connected to the LED beads to provide a second power supply voltage; wherein the first power supply voltage is greater than the second power supply voltage; A switching module includes a first switching unit and a second switching unit; the first switching unit is connected between the energy storage module and the LED lamp bead, and the second switching unit is connected to the LED lamp bead; the switching module is used to control the target path to be turned on according to the switching control signal corresponding to the target light emission mode, so that the LED lamp bead works in the target light emission mode based on the target path; The first switching unit is used to control the connection state of the energy storage module and the LED beads in the first path; the second switching unit is used to control the connection state of the second power supply and the LED beads in the second path; the target path is one of the first path and the second path. The LED flash has two illumination modes: a flash mode and a constant-on mode. When the target illumination mode is the flash mode, the first switching unit is turned on to power the LED through the energy storage module. When the target illumination mode is the constant-on mode, the second switching unit is turned on to power the LED through the second power supply.

2. The LED flash control circuit according to claim 1, characterized in that, Also includes: A flash control module, connected to the LED beads, is used to control the strobe of the LED beads according to a flash control signal, which is generated based on the target flash power when the LED beads are operating in the target light emission mode.

3. The LED flash control circuit according to claim 2, characterized in that, Also includes: The current suppression module has one end connected to the common connection terminal of the LED bead and the second switching unit, and the other end connected to the flash control module, and is used to suppress the instantaneous current in the path where the LED bead is located; The absorption module has one end connected to the common connection terminal of the current suppression module and the flash control module, and the other end connected to the common connection terminal of the first switching unit and the LED beads, and is used to absorb the energy released by the current suppression module.

4. The LED flash control circuit according to claim 2, characterized in that, Also includes: A current suppression module is connected between the first switching unit and the LED bead, and is used to suppress the instantaneous current in the path where the LED bead is located; The absorption module has one end connected to the common connection terminal of the current suppression module and the flash control module, and the other end connected to the common connection terminal of the first switching unit and the current suppression module, and is used to absorb the energy released by the current suppression module.

5. The LED flash control circuit according to claim 2, characterized in that, Also includes: The current suppression module is connected at one end to the LED lamp bead and at the other end to the common connection terminal of the second switching unit and the flash control module, and is used to suppress the instantaneous current in the path where the LED lamp bead is located. The absorption module has one end connected to the common connection terminal of the current suppression module and the flash control module, and the other end connected to the common connection terminal of the first switching unit and the current suppression module, and is used to absorb the energy released by the current suppression module.

6. The LED flash control circuit according to claim 2, characterized in that, The flash control module is the second switching unit, and the circuit further includes: A current suppression module is connected between the first switching unit and the LED bead, and is used to suppress the instantaneous current in the path where the LED bead is located; The absorption module has one end connected to the common connection terminal of the LED bead and the second switching unit, and the other end connected to the common connection terminal of the first switching unit and the current suppression module, and is used to absorb the energy released by the current suppression module.

7. The LED flash control circuit according to claim 6, characterized in that, Also includes: An isolation module is connected between the second power supply and the current suppression module to isolate the second power supply and the LED beads.

8. The LED flash control circuit according to any one of claims 1-6, characterized in that, Also includes: An isolation module is connected between the second power supply and the LED beads to isolate the second power supply and the LED beads.

9. A lighting device, characterized in that, include: Two or more LED light groups, one of the LED light groups including at least one LED bulb; Two or more LED flash control circuits, one LED flash group is provided in one LED flash control circuit, and multiple LED flash control circuits are connected in parallel, wherein the LED flash control circuit is the LED flash control circuit according to any one of claims 1-8.

10. The lighting device according to claim 9, characterized in that, Each of the LED light groups emits a different color.

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