Flash lamp control method, circuit and system

Abstract

The invention discloses a flash lamp control method, circuit and system. The method comprises the following steps: determining discharge path information of an energy storage module according to a flash power gear indicated by a flash lamp control instruction; wherein the energy storage module is used for storing energy required by light emission of the flash lamp; the discharge path information indicates inductance information of a discharge path of the energy storage module; at least one target current path is selected from a plurality of current paths according to the discharge path information, and the current paths are connected in parallel and have different inductance values; and controlling the at least one target current path to be conducted so as to enable the energy storage module to discharge based on the at least one target current path and enable the flash lamp to flash based on the flash power gear. According to the technical scheme, the color temperature difference of the flash lamp under different flash powers is reduced, so that the light color is kept in a relatively stable state when the flash lamp flashes according to different powers.

Description

Technical Field

[0001] The present application belongs to the technical field of lighting control, and specifically relates to a flash control method, circuit and system. Background Art

[0002] A flash is a photography auxiliary device used to provide an additional light source in low-light conditions to obtain a better exposure effect. In some cases, users need to control the light intensity of the flash, which is usually achieved by changing the flash power. When the flash power changes, the current in the circuit where the flash is located will change. This change in current will cause a large change in color temperature, which will cause the color presented by the flash to be different. For example, when the flash is high-power, the average color temperature is between cold and warm tones, and when the flash is low-power, the average color temperature is higher, which makes the light color warmer. However, in some cases, users usually only want the flash frequency to change, and do not want the color temperature to change and cause the light color to change. Therefore, the current flash control method needs to be improved.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The purpose of the present application is to provide a flash control method, circuit and system to reduce the color temperature difference of the flash at different flash powers.

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

[0006] According to one aspect of an embodiment of the present application, a flash control method is provided, including:

[0007] Determine the discharge path information of the energy storage module according to the flash power level indicated by the flash control instruction; wherein the energy storage module is used to store the energy required for the flash to emit light; the discharge path information indicates the inductance information of the discharge path of the energy storage module;

[0008] selecting at least one target current path from a plurality of current paths according to the discharge path information, wherein the current paths are connected in parallel and have different inductance values, and a combined inductance value of the at least one target current path matches the inductance information indicated by the discharge path information;

[0009] The at least one target current path is controlled to be turned on, so that the energy storage module discharges based on the at least one target current path, and the flash lamp flashes based on the flash power level.

[0010] According to one aspect of an embodiment of the present application, there is provided a flash control device, comprising:

[0011] An information determination module, used to determine the discharge path information of the energy storage module according to the flash power level indicated by the flash control instruction; wherein the energy storage module is used to store the energy required for the flash to emit light; and the discharge path information indicates the inductance information of the discharge path of the energy storage module;

[0012] a selection module, configured to select at least one target current path from a plurality of current paths according to the discharge path information, wherein the current paths are connected in parallel and have different inductance values, and a combined inductance value of the at least one target current path matches the inductance information indicated by the discharge path information;

[0013] The control module is used to control the at least one target current path to be turned on, so that the energy storage module discharges based on the at least one target current path, and the flash lamp flashes based on the flash power level.

[0014] According to one aspect of an embodiment of the present application, a flash control circuit is provided, including:

[0015] An energy storage module, connected to the power supply, and used to store energy required for the flash lamp to emit light through the power supply;

[0016] A current path selection module is connected to the energy storage module and the flash lamp respectively; the current path selection module includes multiple current paths, each current path is connected in parallel and has a different inductance value; the current path selection module is used to select at least one target current path from the multiple current paths to be turned on according to the flash power level of the flash lamp, so as to connect the energy storage module and the flash lamp.

[0017] According to one aspect of an embodiment of the present application, a flash control system is provided, including:

[0018] An energy storage module, connected to the power supply, and used to store energy required for the flash lamp to emit light through the power supply;

[0019] A main control module, used to determine the discharge path information of the energy storage module according to the flash power level indicated by the flash control instruction; wherein the discharge path information indicates the inductance information of the discharge path of the energy storage module; according to the discharge path information, at least one target current path is selected from multiple current paths, and a control signal of the at least one target current path is generated; the combined inductance value of the at least one target current path matches the inductance information indicated by the discharge path information;

[0020] A current path selection module is respectively connected to the main control module, the energy storage module and the flash lamp; the current path selection module includes multiple current paths, each current path is connected in parallel and has a different inductance value; the current path selection module is used to conduct the at least one target current path according to a control signal of at least one target current path, so that the energy storage module and the flash lamp are connected.

[0021] According to one aspect of an embodiment of the present application, a computer-readable medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the flash control method in the above technical solution is implemented.

[0022] According to one aspect of an embodiment of the present application, an electronic device is provided, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor executes the executable instructions so that the electronic device executes a flash control method as in the above technical solution.

[0023] According to one aspect of the embodiments of the present application, a computer program product or a computer program is provided, the computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the flash control method in the above technical solution.

[0024] In the technical solution provided by the embodiment of the present application, firstly, the discharge path information of the energy storage module is determined according to the flash power level indicated by the flash control instruction; wherein the energy storage module is used to store the energy required for the flash to emit light; the discharge path information indicates the inductance information of the discharge path of the energy storage module; then, according to the discharge path information, at least one target current path is selected from multiple current paths, wherein each current path is connected in parallel and has different inductance values, and the combined inductance value of at least one target current path matches the inductance information indicated by the discharge path information; finally, at least one target current path is controlled to be turned on, so that the energy storage module discharges based on at least one target current path, and the flash flashes based on the flash power level. In this way, when the flash is controlled to emit light according to different flash power levels, the inductance value in the discharge path of the energy storage module is different, and different inductances can make the current change speed different, so that the current change speed is adapted to the flash power, so that the color temperature under different powers is kept in a relatively stable state, thereby reducing the color temperature difference of the flash at different flash powers, and then when the flash flashes according to different powers, the light color is kept in a relatively stable state.

[0025] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 The flowchart of a flash control method provided by an embodiment of the present application is schematically shown.

[0028] Figure 2 The circuit block diagram of a flash control circuit provided by an embodiment of the present application is schematically shown.

[0029] Figure 3 The circuit diagram of a flash control circuit provided by an embodiment of the present application is schematically shown.

[0030] Figure 4 A schematic diagram of a PWM signal provided by an embodiment of the present application is schematically shown.

[0031] Figure 5A A schematic diagram of a high flash power color temperature curve provided by an embodiment of the present application is schematically shown.

[0032] Figure 5B A schematic diagram of a low flash power color temperature curve provided by an embodiment of the present application is schematically shown.

[0033] Figure 6 The following is a schematic diagram of a flash control system provided by an embodiment of the present application.

[0034] Figure 7 The structural block diagram of a flash control device provided by an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0035] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0036] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0037] 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 may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0038] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0039] In the traditional technical solution, when the flash flashes at different powers, the discharge path cannot be selected. Whether it is a high-power flash or a low-power flash, the energy storage module is discharged through the same discharge path. Assuming that there is no inductor in the discharge path, when the flash power changes, the flash color temperature curve is a high color temperature value at the beginning, and the color is obviously cold (i.e., blue), and then the current in the loop decreases rapidly, the color temperature curve is at a low color temperature value, and the color is warm (i.e., red). When flashing at high power, such as full light output, the average flash color temperature is between cold and warm tones, such as between 5400K and 5600K; while in low power, the average flash color temperature is obviously higher. In another case, assuming that there is an inductor in the discharge path, the color temperature is obviously low in the high-power flash mode. It can be seen that when the traditional control circuit controls the flash power to change, the average color temperature also changes continuously, causing the light color to change. Based on this, the present application proposes a flash control method, which can reduce the color temperature difference of the flash at different flash powers, so that the light color of the flash remains in a relatively stable state when the flash flashes at different powers. The flash control method provided by the present application is described in detail below in conjunction with specific implementations.

[0040] Figure 1 The flowchart of a flash control method provided by an embodiment of the present application is schematically shown, and the method can be implemented by a flash control device. Figure 1As shown, the flash control method provided in the embodiment of the present application includes steps 110 to 130, which are specifically as follows:

[0041] Step 110, determining the discharge path information of the energy storage module according to the flash power level indicated by the flash control instruction; wherein the energy storage module is used to store the energy required for the flash to emit light; and the discharge path information indicates the inductance information of the discharge path of the energy storage module.

[0042] Specifically, an energy storage module is usually provided in the circuit where the flashlight is located. The energy storage module is used to store the energy required for the flashlight to emit light. Specifically, during the flashing process of the flashlight, the energy stored in the energy storage module is transmitted to the flashlight through the discharge path connected thereto, so that the flashlight starts to work and flash after the function is activated. Generally speaking, the faster the energy in the energy storage module is transferred to the flashlight, the greater the energy released by the flashlight, that is, the higher the flash power, which is reflected in the visual effect that the flashlight emits brighter light. Flash power (Ws, watt-seconds) is a unit of measure for the energy released by a flashlight in a flash. It indicates the amount of energy transmitted by the flashlight in a specific time.

[0043] The flashlight can emit light based on different flash powers, which are set by corresponding flash power gears, and each flash power gear is marked with the ratio of the current flash power to the maximum flash power. For example, the maximum flash power is recorded as 1, then the full power output is recorded as 1 / 1, half of the full power (half power) is recorded as 1 / 2, half of the half power is recorded as 1 / 4, and so on, multiple flash power gears can be obtained. Exemplarily, Table 1 schematically shows the flash power gears of two models of flashlights, where model AD600 indicates that the maximum flash power of the flashlight is 600Ws, and model AD200 indicates that the maximum flash power of the flashlight is 200Ws. It can be seen that the flash powers of different models of flashlights are different, but they can have the same flash power gear, and the specific flash power corresponding to a flash power gear needs to be determined according to the maximum flash power of the flashlight.

[0044] Table 1

[0045] Power Classification AD600 AD200 1 / 1 600Ws 200Ws 1 / 2 300Ws 100Ws 1 / 4 150Ws 50Ws 1 / 8 75Ws 25Ws 1 / 16 38Ws 13Ws 1 / 32 19Ws 7W 1 / 64 10Ws 4Ws 1 / 128 5Ws 2W 1 / 256 3Ws 1Ws

[0046] The flash control instruction can be triggered by the user or automatically according to the program. For example, the user adjusts the flash power level to a certain target level according to his own needs, and the flash control instruction is triggered at this time; for another example, according to the program setting, the flash power level needs to be changed to a certain target level at a certain moment, then the flash control instruction is automatically triggered by the program at this specific moment. The flash control instruction contains the flash power level required for the flash point to work, such as the target level in the above example. The flash power level indicates the level of the flash power. Generally, the larger the flash power level, the higher the flash power. Here, the size of the flash power level refers to the numerical value representing the flash power level, such as flash power level 1 / 1 is greater than flash power level 1 / 2. The higher the flash power, the faster the flash needs to obtain the energy of the energy storage module, which means that the discharge of the energy storage module needs to be faster, and the smaller the inductance in the discharge path of the energy storage module; correspondingly, the lower the flash power, the less the flash does not need to quickly obtain the energy of the energy storage module, which means that the discharge of the energy storage module can be slower, and the larger the inductance in the discharge path of the energy storage module. Therefore, when the flash power level is high, the inductance required for the discharge path of the energy storage module indicated by the discharge path information is small; when the flash power level is low, the inductance required for the discharge path of the energy storage module indicated by the discharge path information is large.

[0047] In one embodiment of the present application, a mapping relationship between the flash power level and the inductance data required by the energy storage module can be pre-set, and then the discharge path information corresponding to the current flash control instruction can be obtained according to the mapping relationship. Among them, considering that the specific flash power indicated by the flash power level also needs to be determined according to the maximum flash power of the flash, the maximum flash power of the flash can be added to the mapping relationship. When determining the discharge path information, the mapping relationship is queried according to the flash power level indicated by the flash control instruction and the maximum flash power of the flash to obtain the corresponding discharge path information. Optionally, different models of flash have different maximum flash powers. Therefore, the mapping relationship between the flash power level, the flash model and the inductance data required by the energy storage module can be pre-set. When determining the discharge path information, the mapping relationship is queried according to the flash power level indicated by the flash control instruction and the flash model to obtain the corresponding discharge path information.

[0048] In one embodiment of the present application, the discharge path information of the energy storage module can be divided into two cases, which correspond to different flash powers, and then the corresponding discharge path information is determined based on the flash power corresponding to the flash power level in the flash control instruction. Specifically, if the flash power corresponding to the flash power level indicated by the flash control instruction is greater than a preset power threshold, the discharge path information of the energy storage module will be determined to be a low-inductance discharge path; if the flash power corresponding to the flash power level indicated by the flash control instruction is less than the preset power threshold, the discharge path information of the energy storage module will be determined to be a high-inductance discharge path.

[0049] That is, the discharge path of the energy storage module is divided into two cases: a low inductance discharge path and a high inductance discharge path. Based on the above analysis, it can be seen that when the low inductance discharge is used, high flash power is applicable, and when the high inductance discharge is used, low flash power is applicable. Therefore, the corresponding flash power can be determined based on the flash power level indicated by the flash control instruction and the maximum flash power of the flash. When the flash power is greater than the preset power threshold, it is considered to be a high flash power, so the discharge path information at this time is a low inductance discharge path; when the flash power is less than the preset power threshold, it is considered to be a low flash power, so the discharge path information at this time is a high inductance discharge path. It can be understood that the case where the flash power is equal to the preset power threshold can be classified into any one of the cases where the flash power is greater than the preset power threshold and the flash power is less than the preset power threshold according to actual needs. In this way, the flash control of multiple flash power levels can be achieved through the two high and low inductance discharge paths.

[0050] Step 120: Select at least one target current path from multiple current paths according to the discharge path information, wherein the current paths are connected in parallel and have different inductance values, and the combined inductance value of the at least one target current path matches the inductance information indicated by the discharge path information.

[0051] Specifically, multiple current paths are arranged between the energy storage module and the flashlight, and these current paths are connected in parallel and their respective inductance values ​​are different. After determining the discharge path information of the energy storage module, at least one target current path is selected from the multiple current paths according to the inductance value indicated by the discharge path information, and these target current paths are used to connect the energy storage module and the flashlight, and transmit the energy released by the energy storage module to the flashlight. Among them, the combined inductance value of at least one target current path should match the inductance value indicated by the discharge path information. For example, the difference between the combined inductance value of at least one target current path and the inductance value indicated by the discharge path information is within a preset range, that is, the two are considered to match. Assuming that there are n target current paths in total, the inductance value in the i-th target current path is Li, the combined inductance value of the n target current paths is Leq, the inductance value indicated by the discharge path information is recorded as Lo, and ε represents a preset threshold value, then the following formula is satisfied:

[0052]

[0053] |Leq-Lo|≤ε

[0054] In one embodiment of the present application, when the discharge path of the energy storage module is divided into a low-inductance discharge path and a high-inductance discharge path, if the discharge path information indicates a low-inductance current path, at least one current path whose combined inductance value is lower than a preset inductance threshold is selected as at least one target current path; if the discharge path information indicates a high-inductance current path, at least one current path whose combined inductance value is higher than a preset inductance threshold is selected as at least one target current path. That is, a high-inductance discharge path can be selected as much as possible for low flash power, and a low-inductance discharge path can be selected as much as possible for high flash power.

[0055] Step 130: Control at least one target current path to be turned on, so that the energy storage module discharges based on the at least one target current path, and the flash lamp flashes based on the flash power level.

[0056] Specifically, not all of the multiple current paths set between the energy storage module and the flash are in a conducting state, but at least one of the target current paths selected above is controlled to be conducting, so that the energy released by the energy storage module is transmitted to the flash through at least one target current path. Then, during the discharge process of the energy storage module, the current change is affected by the inductance in at least one target current path and is adapted to the flash power indicated by the flash power level. Then, when the flash flashes based on the flash power level, the current change in the discharge path will not be too fast or too slow, thereby keeping the color temperature of the flash relatively stable.

[0057] In one embodiment of the present application, each current path can be connected to the energy storage module through a switch. After determining at least one target current path, a switch control signal for each target current path can be generated. The switch control signal can control the closure of the switch in the corresponding target current path, thereby controlling at least one target current path to be turned on.

[0058] In the technical solution provided by the embodiment of the present application, firstly, the discharge path information of the energy storage module is determined according to the flash power level indicated by the flash control instruction; wherein the energy storage module is used to store the energy required for the flash to emit light; the discharge path information indicates the inductance information of the discharge path of the energy storage module; then, according to the discharge path information, at least one target current path is selected from multiple current paths, wherein each current path is connected in parallel and has different inductance values, and the combined inductance value of at least one target current path matches the inductance information indicated by the discharge path information; finally, at least one target current path is controlled to be turned on, so that the energy storage module discharges based on at least one target current path, and the flash flashes based on the flash power level. In this way, when the flash is controlled to emit light according to different flash power levels, the inductance value in the discharge path of the energy storage module is different, and different inductances can make the current change speed different, so that the current change speed is adapted to the flash power, so that the color temperature under different powers is kept in a relatively stable state, thereby reducing the color temperature difference of the flash at different flash powers, and then when the flash flashes according to different powers, the light color is kept in a relatively stable state.

[0059] In one embodiment of the present application, the technical solution of the present application also includes: generating a flash control signal according to the flash power gear, the flash control signal is used to control the flash frequency of the flash lamp, and the flash frequency matches the flash power gear. Specifically, the aforementioned energy storage module is used to supply energy to the flash lamp, and the flash control signal here is used to control the on and off of the circuit where the flash lamp is located. When the circuit where the flash lamp is located is turned on, the flash lamp emits light based on the energy supply of the energy storage module; when the circuit where the flash lamp is located is disconnected, the flash lamp is turned off. The flash frequency indicates the number of times the flash lamp can flash in a unit time, so the flash control signal can actually control the flash frequency of the flash lamp. The greater the flash frequency of the flash lamp, that is, the more times it flashes in a unit time, then the flash power will naturally be greater, so the flash frequency is matched with the flash power.

[0060] In one embodiment of the present application, the flash control signal is a pulse width modulation (PWM) signal with a specified duty cycle. The duty cycle refers to the ratio of the high level time to the entire cycle time within a pulse cycle. Generally, when the PWM signal is at a high level, the circuit where the flash lamp is located is turned on and the flash lamp emits light; when the PWM signal is at a low level, the circuit where the flash lamp is located is disconnected and the flash lamp is turned off. In this embodiment, the required flash frequency can be determined according to the flash power corresponding to the flash power gear, and then the PWM signal can be generated according to the flash frequency.

[0061] In one embodiment of the present application, when different current paths are selected as target current paths, the starting discharge voltage of the energy storage module remains consistent. That is, the starting discharge voltage of the energy storage module remains consistent when discharging in different current paths. For example, each time, whether it is a high flash power (low inductance discharge path) or a low flash power (high inductance discharge path), the voltage is returned to the maximum voltage of the energy storage module after the flash ends.

[0062] It should be noted that although the steps of the method in the present application are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0063] Figure 2 The circuit block diagram of a flash control circuit provided by an embodiment of the present application is schematically shown.

[0064] like Figure 2 As shown, the flash lamp LD2 control circuit provided in the embodiment of the present application includes an energy storage module 210 and a current path selection module 220, wherein the energy storage module 210 is respectively connected to the power supply U and the current path selection module 220, and the current path selection module 220 is connected to the flash lamp LD2. The current path selection module 220 is equivalent to a bridge between the energy storage module 210 and the flash lamp LD2, and the current path selection module 220 includes a plurality of current paths L1 to Ln, wherein Li represents the i-th current path. Each current path is connected in parallel, and the inductance in each current path is different. When the flash lamp LD2 is working, at least one target current path in the current path selection module 220 is connected, so that the energy storage module 210 is connected to the flash lamp LD2, then the energy stored in the energy storage module 210 reaches the flash lamp LD2 based on at least one connected target current path, thereby providing sufficient energy for the flash lamp LD2 to emit light. At least one target current path is selected from the plurality of current paths 221 based on the discharge path information of the energy storage module. The discharge path information of the energy storage module 210 is determined according to the flash power level indicated by the flash control instruction.

[0065] like Figure 2 As shown, each current path is connected to the energy storage module 210 through a corresponding switch Si. After determining at least one target current path, a switch control signal of each target current path is generated to close the corresponding switch, thereby turning on the target current path. Optionally, the switch Si of the current path Li can also be set at one end of the current path Li connected to the flash lamp LD2.

[0066] Figure 3The circuit diagram of a flash control circuit provided by an embodiment of the present application is schematically shown. Figure 3 As shown, the flash control circuit provided in the embodiment of the present application includes an energy storage module and a current path selection module 120, wherein the energy storage module is a capacitor C1. The capacitor C1 is connected to the power supply U and the current path selection module 120 respectively, and the current path selection module 120 is connected to the flash LD1. The current path selection module 220 includes a plurality of current paths L1 to Ln, each current path is connected in parallel, and the inductance in each current path is different, and the current path Li is connected to the capacitor C1 through the corresponding switch Si.

[0067] Further, such as Figure 3 As shown, the flash control circuit provided in the embodiment of the present application further includes a flash control module 230, which is connected to the flash LD1 and is used to control the conduction and disconnection of the circuit where the flash LD1 is located according to the flash power of the flash LD1.

[0068] Further, such as Figure 3 As shown, the flash control module 230 includes a switch tube T1, a second capacitor C2 and a third resistor R1. The first end of the switch tube T1 is connected to the flash lamp LD1, the second end of the switch tube T1 is grounded, and the third end of the switch tube T1 is used to receive a flash control signal generated according to the flash power level of the flash lamp LD1; one end of the second capacitor C2 is connected to the third end of the switch tube T1, and the other end is grounded; one end of the third resistor R1 is connected to the third end of the switch tube T1, and the other end is grounded.

[0069] The flash control signal received by the third end of the switch tube T1 is also called a PWM (Pulse Width Modulation) signal. The PWM signal is used to control the on-time and off-time of the switch tube T1 within a cycle, which is equivalent to controlling the light-emitting frequency of the flash lamp LD1. Therefore, the PWM signal is generated based on the flash power level. Generally, the on-time of the switch tube T1 corresponds to a PWM high-level signal, and the off-time of the switch tube T1 corresponds to a PWM low-level signal. The proportion of high-level signals within a cycle is called the duty cycle of the PWM signal. When the flash power is low, the PWM signal duty cycle is low, and when the flash power is high, the PWM signal duty cycle is high.

[0070] For example, Figure 4The schematic diagram of the PWM signal provided by an embodiment of the present application is schematically shown, wherein PWM1 corresponds to a PWM signal with a low duty cycle, and PWM2 corresponds to a PWM signal with a high duty cycle. For example, when the flash power gear is 1 / 1, it is a high-power flash, and the discharge path information of the capacitor C1 is a low-inductance discharge path. Assuming that the current path L1~L4 is selected as the target current path at this time, the switches S1~S4 corresponding to the current paths L1~L4 receive the switch control signal, and the two switches are closed. The capacitor C1 discharges through the current paths L1~L4. At the same time, the third end of the switch tube T1 receives the PWM2 signal, and the flash lamp LD1 emits high-power light. The color temperature curve is as shown in FIG. Figure 5A shown.

[0071] When the flash power level is 1 / 8, it is a low-power flash, and the discharge path information of capacitor C1 is a high-inductance discharge path. Assuming that current path L1 is selected as the target current path at this time, the switch S1 corresponding to current path L1 receives a switch control signal, and switch S1 is closed. Capacitor C1 discharges through current path L1. At the same time, the third terminal of switch tube T1 receives a PWM1 signal, and flash lamp LD1 emits low-power light. The color temperature curve is as follows: Figure 5B shown.

[0072] according to Figure 5A and Figure 5B It can be seen that the color temperature curve has a high peak but changes steeply during high-power flash, and a low peak but changes smoothly during low-power flash. The median color temperatures of the two are kept in a relatively central position, thereby reducing the color temperature difference of the flash lamp LD1 at different flash powers.

[0073] Further, such as Figure 3 As shown, the flashlight control circuit provided in the embodiment of the present application also includes a flash trigger module 240, which is connected to the flashlight LD1 and the power supply U respectively, and is used to increase the voltage provided by the power supply U to the trigger voltage of the flashlight LD1, and the trigger voltage is used to ionize the medium in the flashlight LD1. In this embodiment, the voltage provided by the power supply U is 320V. After the voltage boosting effect of the flash trigger module 240, the voltage received by the trigger end of the flashlight LD1 can reach thousands of volts. This high voltage shocks the medium in the flashlight LD1 to ionize it, and it can emit light after power is turned on.

[0074] Further, such as Figure 3As shown, the flash trigger module 240 includes a fourth resistor R50, a third capacitor C28 and a transformer TB1, the fourth resistor R50 is respectively connected to the power supply U and the third capacitor C28, the third capacitor C28 is connected to the second end 2 of the primary winding of the transformer TB1, the second end 3 of the secondary winding of the transformer TB1 is connected to the flash lamp LD1, and the first end 1 of the primary winding of the transformer TB1 and the first end 4 of the secondary winding are grounded.

[0075] Further, such as Figure 3 As shown, the flash control circuit provided in the embodiment of the present application further includes an anti-reverse diode D8, the positive electrode of the anti-reverse diode D8 is connected to the flash LD1, and the negative electrode of the anti-reverse diode D8 is connected to the flash control module 230, specifically connected to the first end of the switch tube T1 in the flash control module 230. The negative electrode of the anti-reverse diode D8 is also connected to the common connection end of the fourth resistor R50 and the third capacitor C28. The anti-reverse diode D8 is used to prevent circuit failure caused by reverse connection of the voltage in the loop where the flash LD1 is located.

[0076] The flash control circuit provided in the embodiment of the present application makes the inductance value in the discharge path of the energy storage module different when controlling the flash to emit light according to different flash power levels. Different inductances can make the current change speed different, so that the current change speed is adapted to the flash power, so that the color temperature at different powers is maintained in a relatively stable state, thereby reducing the color temperature difference of the flash at different flash powers, and further making the light color remain in a relatively stable state when the flash flashes according to different powers.

[0077] Figure 6 The following schematically shows a schematic diagram of a flash control system provided by an embodiment of the present application. Figure 6 As shown, the flash control system includes: an energy storage module 210, a main control module 250 and a current path selection module 220, wherein the main control module 250 is connected to the current path selection module 220, and the connection relationship and functions between the energy storage module 210 and the current path selection module 220 refer to the description in the aforementioned flash control circuit embodiment, which will not be repeated here.

[0078] Further, such as Figure 6 As shown, the flash control system also includes a flash control module 230. The specific structure of the flash control module 230 can be referred to Figure 3The description of the illustrated embodiment is not repeated here. The main control module 250 is respectively connected to the switches Si corresponding to each current path Li in the current path selection module 220, and is connected to the third end of the switch tube T1 in the flash control module 230. The main control module 250 determines the discharge path information of the energy storage module 210 according to the flash power level indicated by the flash control instruction, selects at least one target current path from multiple current paths according to the discharge path information, and generates a control signal for at least one target current path, which is a switch control signal corresponding to the target current path, and is used to control the switch to close so that the target current path is turned on. At the same time, the main control module 250 generates a flash control signal according to the flash power level indicated by the flash control instruction, and inputs the flash control signal to the third end of the switch tube T1, so that the switch tube T1 is turned on and off based on the flash control signal, thereby controlling the on and off of the circuit where the flash lamp LD1 is located, so that the flash lamp LD1 flashes according to the flash power indicated by the flash power level.

[0079] The present application also provides a flashlight control device, which is used to execute the flashlight control method in the above embodiment of the present application. Figure 7 As shown, the flash control device provided by the technical solution of the present application includes:

[0080] The information determination module 710 is used to determine the discharge path information of the energy storage module according to the flash power level indicated by the flash control instruction; wherein the energy storage module is used to store the energy required for the flash to emit light; and the discharge path information indicates the inductance information of the discharge path of the energy storage module;

[0081] A selection module 720, configured to select at least one target current path from a plurality of current paths according to the discharge path information, wherein the current paths are connected in parallel and have different inductance values, and a combined inductance value of the at least one target current path matches the inductance information indicated by the discharge path information;

[0082] The control module 730 is used to control the at least one target current path to be turned on, so that the energy storage module discharges based on the at least one target current path, and the flash lamp flashes based on the flash power level.

[0083] In one embodiment of the present application, the information determination module 710 is specifically used to:

[0084] If the flash power corresponding to the flash power level indicated by the flash control instruction is greater than the preset power threshold, the discharge path information of the energy storage module is determined to be a low-inductance discharge path;

[0085] If the flash power corresponding to the flash power level indicated by the flash control instruction is less than the preset power threshold, the discharge path information of the energy storage module will be determined to be a high-inductance discharge path.

[0086] In one embodiment of the present application, the selection module 720 is specifically used to:

[0087] If the discharge path information indicates a low-inductance current path, selecting at least one current path whose combined inductance value is lower than a preset inductance threshold as at least one target current path;

[0088] If the discharge path information indicates a high inductance current path, at least one current path whose combined inductance value is higher than a preset inductance threshold is selected as at least one target current path.

[0089] In one embodiment of the present application, the device further includes:

[0090] The flash control module is used to generate a flash control signal according to the flash power level, wherein the flash control signal is used to control the flash frequency of the flash lamp, and the flash frequency matches the flash power level.

[0091] In one embodiment of the present application, the flash control signal is a pulse width modulation signal with a specified duty cycle.

[0092] In one embodiment of the present application, when different current paths are selected as target current paths, the starting discharge voltage of the energy storage module remains consistent.

[0093] The specific details of the flash control device provided in each embodiment of the present application have been described in detail in the corresponding method embodiment, and will not be repeated here.

[0094] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the above-mentioned module, program segment or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0095] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0096] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the implementation methods of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the implementation methods of the present application.

[0097] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application.

[0098] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A flashlight control method, characterized in that: include: Determine the discharge path information of the energy storage module according to the flash power level indicated by the flash control instruction; wherein the energy storage module is used to store the energy required for the flash to emit light; the discharge path information indicates the inductance information of the discharge path of the energy storage module; selecting at least one target current path from a plurality of current paths according to the discharge path information, wherein the current paths are connected in parallel and have different inductance values, and a combined inductance value of the at least one target current path matches the inductance information indicated by the discharge path information; The at least one target current path is controlled to be turned on, so that the energy storage module discharges based on the at least one target current path, and the flash lamp flashes based on the flash power level.

2. The flash control method according to claim 1, characterized in that: The discharge path information of the energy storage module is determined according to the flash power level indicated by the flash control instruction, including: If the flash power corresponding to the flash power level indicated by the flash control instruction is greater than the preset power threshold, the discharge path information of the energy storage module is determined to be a low-inductance discharge path; If the flash power corresponding to the flash power level indicated by the flash control instruction is less than the preset power threshold, the discharge path information of the energy storage module will be determined to be a high-inductance discharge path.

3. The flash control method according to claim 1, characterized in that: According to the discharge path information, selecting at least one target current path from a plurality of current paths includes: If the discharge path information indicates a low-inductance current path, selecting at least one current path whose combined inductance value is lower than a preset inductance threshold as at least one target current path; If the discharge path information indicates a high inductance current path, at least one current path whose combined inductance value is higher than a preset inductance threshold is selected as at least one target current path.

4. The flash control method according to claim 1, characterized in that: The method further comprises: A flash control signal is generated according to the flash power level, and the flash control signal is used to control the flash frequency of the flash lamp, and the flash frequency matches the flash power level.

5. The flash control method according to claim 4, characterized in that: The flash control signal is a pulse width modulation signal with a specified duty cycle.

6. The flash control method according to claim 1, characterized in that: When different current paths are selected as target current paths, the starting discharge voltage of the energy storage module remains consistent.

7. A flashlight control circuit, characterized in that: include: An energy storage module, connected to the power supply, and used to store energy required for the flash lamp to emit light through the power supply; A current path selection module is connected to the energy storage module and the flash lamp respectively; the current path selection module includes multiple current paths, each current path is connected in parallel and has a different inductance value; the current path selection module is used to select at least one target current path from the multiple current paths to be turned on according to the flash power level of the flash lamp, so as to connect the energy storage module and the flash lamp.

8. The flash control circuit according to claim 7, characterized in that: Also includes: A control signal filtering module is connected to the current path selection module and is used to filter the control signal, where the control signal is used to control the conduction of the target current path.

9. The flash control circuit according to claim 8, characterized in that: The control signal filtering module includes a first resistor, a second resistor and a first capacitor, one end of the first resistor is used to receive the control signal, and the other end is connected to the current path selection module; one end of the first capacitor is connected to the current path selection module, and the other end is grounded; one end of the second resistor is connected to the gate of the thyristor switch, and the other end is grounded.

10. The flash control circuit according to claim 7, characterized in that: Also includes: The flash control module is connected to the flash lamp and is used to control the on and off of the circuit where the flash lamp is located according to the flash power of the flash lamp.

11. The flash control circuit according to claim 10, characterized in that: The flash control module includes a switch tube, a second capacitor and a third resistor. The first end of the switch tube is connected to the flash lamp, the second end of the switch tube is grounded, and the third end of the switch tube is used to receive an on-off adjustment signal generated according to the flash power of the flash lamp; one end of the second capacitor is connected to the third end of the switch tube, and the other end is grounded; one end of the third resistor is connected to the third end of the switch tube, and the other end is grounded.

12. The flash control circuit according to claim 10, characterized in that: Also includes: The flash trigger module is connected to the flash lamp and the power supply respectively, and is used to increase the voltage provided by the power supply to the trigger voltage of the flash lamp, and the trigger voltage is used to ionize the medium in the flash lamp.

13. The flash control circuit according to claim 12, characterized in that: The flash trigger module includes a fourth resistor, a third capacitor and a transformer, the fourth resistor is connected to the power supply and the third capacitor respectively, the third capacitor is connected to the primary winding of the transformer, and the secondary winding of the transformer is connected to the flash lamp.

14. The flash control circuit according to claim 13, characterized in that: Also includes: An anti-reverse diode, wherein the positive electrode of the anti-reverse diode is connected to the flash lamp, the negative electrode of the anti-reverse diode is connected to the flash control module, and the negative electrode of the anti-reverse diode is also connected to the common connection end of the fourth resistor and the third capacitor.

15. A flash control system, characterized in that: include: An energy storage module, connected to the power supply, and used to store energy required for the flash lamp to emit light through the power supply; A main control module, used to determine the discharge path information of the energy storage module according to the flash power level indicated by the flash control instruction; wherein the discharge path information indicates the inductance information of the discharge path of the energy storage module; according to the discharge path information, at least one target current path is selected from multiple current paths, and a control signal of the at least one target current path is generated; the combined inductance value of the at least one target current path matches the inductance information indicated by the discharge path information; A current path selection module is respectively connected to the main control module, the energy storage module and the flash lamp; the current path selection module includes multiple current paths, each current path is connected in parallel and has a different inductance value; the current path selection module is used to conduct the at least one target current path according to a control signal of at least one target current path, so that the energy storage module and the flash lamp are connected.

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