CN112882318B - Flashlight color temperature control circuit and control method, and flashlight device - Google Patents
Flashlight color temperature control circuit and control method, and flashlight deviceInfo
- Publication number
- CN112882318B CN112882318B CN202110184900.6A CN202110184900A CN112882318B CN 112882318 B CN112882318 B CN 112882318B CN 202110184900 A CN202110184900 A CN 202110184900A CN 112882318 B CN112882318 B CN 112882318B
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- control
- color temperature
- circuit
- flash
- luminous
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
- G03B15/03—Combinations of cameras with lighting apparatus; Flash units
- G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The application provides a flash lamp color temperature control circuit and a control method, and a flash lamp device. The flash lamp color temperature control circuit comprises a power supply circuit, a trigger circuit and a control unit. The power supply circuit is provided with a first controlled end and an electric energy output end, the electric energy output end is used for electrically connecting the light emitting unit of the flash lamp so as to supply power to the light emitting unit according to the voltage regulation signal, the power supply circuit is connected in series with the light emitting unit to form a power supply loop, the trigger circuit is provided with a second controlled end and a trigger control end, the trigger control end is electrically connected with the power supply loop so as to regulate the duration of flash of the light emitting unit according to the on-off control signal, and the control unit is electrically connected with the first controlled end and the second controlled end and is used for regulating the luminous color temperature of the light emitting unit by sending the voltage regulation signal to the first controlled end and sending the on-off control signal to the second controlled end. The application can improve the flexibility of adjusting the color temperature of the flash lamp.
Description
Technical Field
The application relates to the field of photographic equipment, in particular to a flash lamp color temperature control circuit, a control method and flash lamp equipment.
Background
With the development of mobile communication technology, mobile terminals play an increasingly important role in the life and work of people. Particularly, some mobile terminal devices with photographing functions, such as mobile phones, MP4, PDAs, notebook computers, etc., have great fun for people's life. The photographing needs a light source, more times than natural light, artificial light is needed to assist photographing, the artificial light source of the mobile terminal with the photographing function often cannot meet the actual use requirement, and therefore people often use an external flash lamp to assist photographing.
However, the color temperature adjustment in the external flash lamp generally has only a few fixed gears, which is inflexible and cannot meet the requirement of the light color temperature of the external flash lamp in diversified shooting environments.
The above information disclosed in the background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
It is an object of the present application to provide a flash color temperature control circuit that improves the flexibility of flash color temperature adjustment.
In order to solve the technical problems, the application adopts the following technical scheme:
a flash color temperature control circuit comprising:
the power supply circuit is provided with a first controlled end and an electric energy output end, wherein the first controlled end is used for receiving a voltage regulation signal, and the electric energy output end is used for electrically connecting a light-emitting unit of the flash lamp so as to supply power to the light-emitting unit according to the voltage regulation signal;
the trigger circuit is provided with a second controlled end and a trigger control end, wherein the second controlled end is used for receiving an on-off control signal, and the trigger control end is electrically connected with the power supply loop so as to adjust the duration of the flash of the light-emitting unit according to the on-off control signal;
The control unit is electrically connected with the first controlled end and the second controlled end, and is used for adjusting the luminous color temperature of the luminous unit by sending the voltage adjusting signal to the first controlled end and sending the on-off control signal to the second controlled end.
According to an embodiment of the application, the control unit comprises a main control circuit having a first control terminal and a second control terminal;
The first control end is electrically connected with the first controlled end and is used for sending the voltage regulating signal to the first controlled end;
the second control end is electrically connected with the second controlled end and is used for sending the on-off control signal to the second controlled end.
According to an embodiment of the application, the control unit comprises a first control circuit and a second control circuit;
The first control circuit is electrically connected with the first controlled end and is used for sending the voltage regulating signal to the first controlled end;
The second control circuit is electrically connected with the second controlled end and is used for sending the on-off control signal to the second controlled end.
According to an embodiment of the present application, the power supply circuit includes a voltage regulation circuit and an energy storage circuit connected in series;
The control end of the voltage regulating circuit is connected with the control unit so as to output specific voltage under the control of the control unit;
The energy storage circuit is used for connecting the light-emitting units, the energy storage circuit stores electric energy output by the voltage regulating circuit, and the output voltage of the energy storage circuit is larger than or equal to the light-emitting trigger voltage of the light-emitting units.
According to an embodiment of the present application, the voltage regulating circuit includes a forward circuit or a flyback circuit, a transformer is provided in the forward circuit or the flyback circuit, a primary winding of the transformer is connected to the power supply, and a secondary winding of the transformer is connected to the energy storage circuit.
According to one embodiment of the application, the trigger circuit comprises a switch circuit, wherein a controlled end of the switch circuit is connected with the control unit, and a first end and a second end of the switch circuit are connected in series in the power supply loop;
The control unit controls the on-off of the power supply loop by controlling the on-off of the switch circuit.
According to an embodiment of the present application, the on-off control signal is a PWM signal, and the control unit adjusts the duration of the flash of the light emitting unit by adjusting the duty ratio of the on-off control signal.
According to an embodiment of the application, the control unit further comprises a storage circuit, wherein the storage circuit stores a corresponding relation between a luminous color temperature and a control parameter, and the control parameter comprises power supply voltage information of the luminous unit and flash duration information of the luminous unit;
The control unit generates the voltage regulating signal and the on-off control signal according to the corresponding relation between the luminous color temperature and the control parameter and the target luminous color temperature to be achieved.
According to an embodiment of the application, the control unit further comprises a storage circuit, wherein the storage circuit stores the corresponding relation between the luminous color temperature, the flash power and the control parameters, and the control parameters comprise the power supply voltage information of the luminous unit and the flash duration information of the luminous unit;
the control unit generates the voltage regulating signal and the on-off control signal according to the corresponding relation between the luminous color temperature and the flash power and the control parameters, and the target luminous color temperature and the target flash power to be achieved.
According to another aspect of the present application, there is also provided a flash apparatus including a light emitting unit and a flash color temperature control circuit;
the flash lamp color temperature control circuit is electrically connected with the light-emitting unit and used for adjusting the light-emitting color temperature of the light-emitting unit.
According to another aspect of the present application, there is also provided a flash color temperature control method, including:
acquiring a target luminous color temperature to be achieved by a luminous unit of the flash lamp;
Determining a control parameter corresponding to the target luminous color temperature according to a corresponding relation between a preset luminous color temperature and the control parameter, wherein the control parameter comprises the luminous unit power supply voltage information and the luminous unit flash duration information;
And controlling the power supply voltage of the light emitting unit and the duration of the flashing of the light emitting unit according to the determined control parameters.
According to an embodiment of the application, the method further comprises:
Acquiring target flash power to be achieved by the light emitting unit;
the determining the control parameter corresponding to the target luminescence color temperature according to the corresponding relation between the preset luminescence color temperature and the control parameter comprises the following steps:
and determining control parameters corresponding to the target luminous color temperature and the target flash power according to the preset corresponding relation between the luminous color temperature, the flash power and the control parameters.
According to an embodiment of the application, the preset corresponding relation between the luminous color temperature, the flash power and the control parameters is obtained from a color temperature control database, and the color temperature control database is generated by the following method:
Controlling the light-emitting unit to emit light by using a plurality of groups of specific control parameters;
For each group of control parameters, acquiring the luminous color temperature and the flash power of the corresponding luminous unit;
and establishing corresponding relations between the control parameters and the luminous color temperature and the flash power of the luminous unit, and generating a plurality of groups of corresponding relation sets into the color temperature control database.
In the application, the control unit is electrically connected with the first controlled end of the power supply circuit and the second controlled end of the trigger circuit, and the control unit sends a voltage adjusting signal to the first controlled end, so that the power supply circuit adjusts the output voltage of the electric energy output end according to the voltage adjusting signal, thereby realizing the adjustment of the luminous color temperature of the flash lamp. The control circuit sends an on-off control signal to the second controlled end, and the trigger circuit adjusts the duration of the flash of the light-emitting unit according to the on-off control signal, so as to adjust the light-emitting color temperature of the light-emitting unit. Therefore, the flexibility of color temperature adjustment is improved by adjusting both the supply voltage of the light-emitting voltage and the duration of the flash.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a block diagram showing a circuit configuration of a flash color temperature control circuit according to an embodiment.
Fig. 2 is a circuit block diagram showing a flash color temperature control circuit according to another embodiment.
Fig. 3 is a flowchart illustrating a flash color temperature control method according to an embodiment.
Detailed Description
While this application is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the application and is not intended to limit the application to that as illustrated.
Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the application, not to imply that each embodiment of the application must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.
In the embodiment shown in the drawings, indications of orientation (such as up, down, left, right, front and rear) are used to explain the structure and movement of the various elements of the application are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the position of these elements changes, the indication of these directions changes accordingly.
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many different forms and should not be construed as limited to the examples set forth herein, but rather, the exemplary embodiments are provided so that the description of the present application will be more complete and thorough, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.
Preferred embodiments of the present application will be further elaborated below with reference to the drawings of the present specification.
The embodiment of the application provides a flash lamp color temperature control circuit which is used for regulating and controlling the light emitting color temperature of a flash lamp light emitting unit 10. Referring to fig. 1, fig. 1 is a block diagram illustrating a circuit structure of a flash color temperature control circuit according to an embodiment.
Here, the flash color temperature control circuit includes a power supply circuit 10, a trigger circuit 20, and a control unit 30. The power supply circuit 10 is provided with a first controlled end and an electric energy output end, wherein the first controlled end is used for receiving a voltage regulation signal, the electric energy output end is used for electrically connecting the light emitting unit 10 of the flash lamp so as to supply power to the light emitting unit 10 according to the voltage regulation signal, the power supply circuit 10 is connected with the light emitting unit 10 in series to form a power supply loop, the trigger circuit 20 is provided with a second controlled end and a trigger control end, the second controlled end is used for receiving an on-off control signal, the trigger control end is electrically connected with the power supply loop so as to regulate the duration of flash of the light emitting unit 10 according to the on-off control signal, and the control unit 30 is electrically connected with both the first controlled end and the second controlled end and is used for regulating the luminous color temperature of the light emitting unit 10 by sending the voltage regulation signal to the first controlled end and sending the on-off control signal to the second controlled end.
Here, the specific structure of the light emitting unit 10 is not limited. In one embodiment, the lighting unit 10 includes a xenon lamp. The light emitting unit 10 generally has a trigger coil therein. The light emitting unit 10 is supplied with power by applying a power supply voltage across the trigger coil.
In an example, the lamp tube of the light emitting unit 10 has xenon therein, and when the voltage applied to the trigger coil is higher than the trigger voltage, the xenon in the lamp tube is strongly shocked by electric shock, and thus the xenon emits intense light, so as to realize the flash of the light emitting unit 10.
The power output end of the power supply circuit 10 and the trigger coil of the light emitting unit 10 form a power supply loop, and when the power supply loop is conducted, the power supply voltage output by the power output end of the power supply circuit 10 is applied to the light emitting unit 10, so that the light emitting unit 10 emits light. The higher the power supply voltage of the light emitting unit 10, the higher the emission color temperature thereof.
Referring to fig. 2, fig. 2 is a block diagram illustrating a circuit structure of a flash color temperature control circuit according to another embodiment. In an embodiment, the power supply circuit 10 includes a voltage adjusting circuit 11 and an energy storage circuit 12 connected in series, an input end of the voltage adjusting circuit 11 is connected with a power supply, an output end of the voltage adjusting circuit 11 is connected with the energy storage circuit 12, a controlled end of the voltage adjusting circuit 11 is connected with the control unit 30 to output a specific voltage under the control of the control unit 30, the energy storage circuit 12 is connected with the light emitting unit 10, the energy storage circuit 12 stores the electric energy output by the voltage adjusting circuit 11, and the output voltage of the energy storage circuit 12 is greater than or equal to the trigger voltage of the light emitting unit 10 to emit light.
The power source may be external or may be a battery within the flashlight. Depending on the supply voltage, the voltage regulating circuit 11 may be a buck circuit or a boost circuit. The voltage-reducing circuit may be a BUCK circuit, or a charge pump circuit. The BOOST circuit may be a BOOST circuit.
In one example, the voltage regulating circuit 11 includes a forward circuit or a flyback circuit having a transformer and a control switch therein, the primary winding of the transformer being connected to a power supply and the secondary winding of the transformer being connected to the tank circuit 12. The control switch is connected in series with the primary winding and is controlled by the control unit 30.
In this case, the primary winding of the transformer in the positive electrode circuit may be directly connected to an ac power supply, or may be connected to a dc power supply through an inverter circuit. Since the light emitting unit 10 requires a higher supply voltage to trigger the xenon light emission. So that its power supply safety needs to be considered. In this embodiment, the voltage conversion function is implemented by using the transformer in the forward circuit, and the isolation function of the transformer is used, so that the input end and the output end of the voltage regulating circuit 11 in this embodiment have better isolation performance, thereby improving the safety of the input side of the voltage regulating circuit 11 and the control circuit.
Tank circuit 12 may include one or more capacitors. When the power is turned on, the energy storage unit is gradually charged, and the output voltage gradually increases, and the capacity value of the energy storage circuit 12 is set so that the output voltage of the energy storage circuit 12 can be greater than or equal to the light-emitting trigger voltage of the light-emitting unit 10. I.e. when the trigger voltage is reached and the power supply loop is on, the flash emits light.
The trigger circuit 20 is electrically connected to the power supply circuit. In an example, the trigger circuit 20 may be connected to the light emitting unit 10, and when the trigger unit sends a trigger signal, a certain structure inside the light emitting unit 10 acts to make the power supply loop conductive, so that the light emitting unit 10 emits light. In another example, the trigger circuit 20 comprises a switch circuit, a controlled end of the switch circuit is connected with the control unit 30, a first end and a second end of the switch circuit are connected in series in the power supply loop, and the control unit 30 controls the on-off of the power supply loop by controlling the on-off of the switch circuit.
In this case, the switching circuit may include one or more switching tubes, and if there are multiple switching tubes, the switching tubes may be connected in parallel or in series to increase the power that can be turned on or off. The switch tube can be a MOS tube or an IGBT. Taking an IGBT as an example, the gate of the IGBT is a controlled terminal, the base of the IGBT is a controlled terminal, the emitter is a second terminal, and the collector is a first terminal.
Therefore, when the switching circuit is turned off, the power supply circuit is turned off, so that the light emitting unit 10 is turned off, and when the switching circuit is turned on, the power supply circuit is turned on, so that the light emitting unit 10 flashes. The longer the duration of the flash of the light emitting unit 10, the lower the color temperature of the emitted light. The shorter the duration of the flash of the light emitting unit 10, the higher the color temperature of the emitted light. The duration of the flash may be referred to herein as the duration of the flash in one flash-off period of the light-emitting unit 10. Of course, if the flash-off period is too short, the human eye cannot recognize the off state of the light emitting unit 10.
Here, the on-off control signal sent by the control unit 30 may be a PWM signal, and the control unit 30 adjusts the duration of the flash of the light emitting unit 10 by adjusting the duty ratio of the on-off control signal. Here, the switching tube in the switching circuit may be turned on and off at a high on-off frequency to the extent that the human eye cannot feel, and the light emission color temperature of the light emitting unit 10 is regulated by adjusting the on-time/duty ratio in the on-off period of the switching tube.
The control unit 30 is electrically connected to the first controlled end of the power supply circuit 10 and the second controlled end of the trigger circuit 20 at the same time, and the control unit 30 adjusts the output voltage of the electric energy output end according to the voltage adjusting signal by sending the voltage adjusting signal to the first controlled end, so that the adjustment of the luminous color temperature of the flash lamp is realized. The control circuit sends an on-off control signal to the second controlled end, and the trigger circuit 20 adjusts the duration of the flash of the light emitting unit 10 according to the on-off control signal, so as to adjust the light emitting color temperature of the light emitting unit 10. Therefore, the light-emitting color temperature adjusting range and the fineness of the light-emitting color temperature adjusting are increased by adjusting the power supply voltage of the light-emitting voltage and the duration of the flash.
For example, when the adjustment to a certain emission color temperature value is required, the power supply voltage of the light emitting unit 10 is adjusted to perform rough adjustment, and then the flash duration adjustment of the light emitting unit 10 is adjusted to perform fine adjustment, so that the fine adjustment of the emission color temperature is improved.
In one embodiment, the control unit 30 includes a main control circuit having a first control terminal and a second control terminal, the first control terminal is electrically connected to the first control terminal for sending a voltage adjustment signal to the first control terminal, and the second control terminal is electrically connected to the second control terminal for sending an on-off control signal to the second control terminal.
The main control circuit can be a single chip microcomputer, an MCU, a CPU or a main control board. By controlling the power supply circuit 10 and the trigger circuit 20 simultaneously by one main control circuit, the arrangement of communication lines is reduced, and the control synergy of the power supply circuit 10 and the trigger circuit 20 can be improved, thereby improving the stability of the color temperature adjusting process of the flash lamp.
In another embodiment, the control unit 30 includes a first control circuit electrically connected to the first controlled terminal for sending a voltage adjustment signal to the first controlled terminal, and a second control circuit electrically connected to the second controlled terminal for sending an on-off control signal to the second controlled terminal.
Here, the first control circuit may be one of a single chip microcomputer, an MCU, and a CPU. The second control circuit can also be one of a singlechip, an MCU and a CPU. The present embodiment enables separate control of the power supply circuit 10 and the trigger circuit 20, and in case of failure of the first control circuit, the emission color temperature can still be adjusted by the second control circuit by controlling the duration of the flash of the light emitting unit 10. Or in case of failure of the second control circuit, the color temperature of the emitted light may still be adjusted by the first control circuit by controlling the supply voltage of the light emitting unit 10. Therefore, the embodiment improves the reliability of the color temperature control of the flash lamp.
In an embodiment, the flash lamp color temperature control circuit further comprises a storage circuit, the storage circuit stores a corresponding relation between control parameters and a light emitting color temperature, wherein the control parameters comprise power supply voltage information of the light emitting unit 10 and flash duration time information of the light emitting unit 10, and the controller generates a voltage adjusting signal and an on-off control signal according to the corresponding relation between the control parameters and the light emitting color temperature and a target light emitting color temperature to be achieved.
Here, the lighting unit 10 flashing duration information may specifically include a specific duration of the lighting unit 10 flashing, and may also include a duty ratio of the on-off control signal.
The memory circuit may include a hard disk. The corresponding relation between the control parameters and the luminescence color temperature can be embodied in the form of a table or a curve. The corresponding relation between the control parameters and the luminous color temperature can be stored in the storage circuit in a data line transmission and network downloading mode.
In an embodiment, the target luminescence color temperature may be generated by a flash lamp according to a shooting environment based on a specific algorithm, or may be set by a user. The flash may be configured to further include a human-computer interaction component, such as a key, a touch screen, a voice input component, etc., for a user to input a target luminescence color temperature.
When the control unit 30 obtains the target luminescence color temperature, the control parameters can be found based on the corresponding relation between the preset control parameters and the luminescence color temperature, so as to generate the voltage adjusting signal and the on-off control signal. The power supply circuit 10 outputs a corresponding voltage according to the voltage regulation signal, and the trigger circuit 20 controls the duration of the flash of the light emitting unit 10 according to the on-off control signal, so that the value of the light emitting color temperature output by the light emitting unit 10 is matched with the target light emitting color temperature. According to the embodiment, the storage circuit is arranged, and the corresponding relation between the control parameters and the luminous color temperature is pre-stored in the storage circuit, so that the accuracy of matching the target luminous color temperature is improved.
In another embodiment, the flash lamp color temperature control circuit further comprises a storage circuit, the storage circuit stores the corresponding relation between the luminous color temperature, the flash power and the control parameters, wherein the control parameters comprise the power supply voltage information of the luminous unit 10 and the flash duration information of the luminous unit 10, and the controller generates a voltage regulating signal and an on-off control signal according to the corresponding relation between the luminous color temperature, the flash power and the control parameters, and the target luminous color temperature and the target flash power to be achieved.
Specifically, the corresponding relation between the luminous color temperature, the flash power and the control parameters can be embodied in the form of a table or a curve. The system can be embodied in the form of tables or curves and can be stored in a storage circuit in a data line transmission and network downloading mode.
When the control unit 30 obtains the target emission color temperature and the target flash power, the control parameters can be found based on the preset emission color temperature, flash power and control parameters, so as to generate the voltage regulation signal and the on-off control signal. The power supply circuit 10 outputs a corresponding voltage according to the voltage regulation signal, and the trigger circuit 20 controls the duration of the flash of the light emitting unit 10 according to the on-off control signal, so that the value of the light emitting color temperature output by the light emitting unit 10 is matched with the target light emitting color temperature, and the flash power of the light emitting unit 10 is matched with the target power. According to the embodiment, the storage circuit is arranged, and the corresponding relation between the control parameters and the luminous color temperature is pre-stored in the storage circuit, so that the accuracy of matching the target luminous color temperature is improved.
In this embodiment, the flash power is simultaneously controlled to further improve the accuracy of color temperature control. The flash power affects the brightness of the light emitting unit 10, so by adjusting the flash light emission color temperature in combination with the brightness of the light emitting unit 10, the accuracy of color temperature control can be improved.
Here, the process of generating the correspondence relation between the emission color temperature, the flash power, and the control parameter will be described as an example.
In one embodiment, the flash lamp color temperature control circuit further comprises a color temperature sampling circuit, wherein the color temperature sampling circuit is used for being electrically connected with the color temperature detection device to sample the luminescence color temperature of the luminescence unit 10 detected by the color temperature detection device, and the color temperature sampling circuit is electrically connected with the control unit 30.
The control unit 30 controls the power supply circuit 10 and the trigger circuit 20 according to specific control parameters. Specifically, the power supply circuit 10 outputs a specific power supply voltage, and the trigger circuit 20 controls the flashing of the light emitting unit 10 for a specific period of time. The control unit 30 generates the correspondence between the specific control parameter and the emission color temperature based on the acquired color temperature value of the color temperature sampling circuit. The control parameters are continuously transformed, and the process of determining the corresponding relation is circulated, namely a color temperature control database can be formed.
Here, the emission color temperature detection means may be an emission color temperature sensor.
In another embodiment, the flash color temperature control circuit further comprises a power detection circuit, wherein the power detection circuit is electrically connected with the power supply circuit 10 and used for detecting the flash power of the light emitting unit 10, and the control circuit is electrically connected with the power detection circuit and used for acquiring the flash power. The power detection circuit may include a voltage detection circuit and a current detection circuit to correspondingly detect the voltage and the current of the light emitting unit 10.
The control unit 30 controls the power supply circuit 10 and the trigger circuit 20 according to specific control parameters. Specifically, the power supply circuit 10 outputs a specific power supply voltage, and the control trigger circuit 20 controls the flashing of the light emitting unit 10 for a specific period of time. The control unit 30 generates the correspondence between the specific control parameter and the emission color temperature and the flash power of the light emitting unit 10 based on the obtained emission color temperature value of the color temperature sampling circuit and the flash power detected by the power detection circuit. The control parameters are continuously transformed, and the process of determining the corresponding relation is circulated, namely a color temperature control database can be formed.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for controlling a color temperature of a flash according to an embodiment. In the following embodiments, embodiments of a flash color temperature control method are described.
In one embodiment, the flash color temperature control method includes:
s50, the target emission color temperature to be reached by the light emitting unit 10 of the flash is acquired.
As before, the target emission color temperature may be generated by a flash based on a specific algorithm according to the shooting environment, or may be set by a user.
S51, determining a control parameter corresponding to the target luminous color temperature according to the corresponding relation between the preset luminous color temperature and the control parameter, wherein the control parameter comprises power supply voltage information of the luminous unit 10 and duration information of the luminous unit 10.
The corresponding relation between the preset luminous color temperature and the control parameter is stored in the storage circuit. The light emitting unit 10 power supply voltage information includes a voltage value of the power supply voltage. The light emitting unit 10 flash duration information includes a specific value of the flash duration, or a ratio (duty ratio) of on time to off time in the on-off period of the flash.
S52, controlling the power supply voltage of the light emitting unit 10 and the duration of the flashing of the light emitting unit 10 according to the determined control parameters.
When the control unit 30 obtains the target luminescence color temperature, the control parameters can be found based on the corresponding relation between the preset control parameters and the luminescence color temperature, so as to generate the voltage adjusting signal and the on-off control signal. The power supply circuit 10 outputs a corresponding voltage according to the voltage regulation signal, and the trigger circuit 20 controls the duration of the flash of the light emitting unit 10 according to the on-off control signal, so that the value of the light emitting color temperature output by the light emitting unit 10 is matched with the target light emitting color temperature. According to the embodiment, the storage circuit is arranged, and the corresponding relation between the control parameters and the luminous color temperature is pre-stored in the storage circuit, so that the accuracy of matching the target luminous color temperature is improved.
In another embodiment, the method further comprises:
The target flash power to be reached by the light emitting unit 10 is obtained.
Here, the target flash power may be calculated by a power detection circuit.
S51, determining a control parameter corresponding to a target luminescence color temperature according to a preset corresponding relation between the luminescence color temperature and the control parameter, wherein the control parameter comprises power supply voltage information of the luminescence unit 10 and duration information of the luminescence unit 10, and the method comprises the following steps:
and determining control parameters corresponding to the target luminous color temperature and the target flash power according to the preset corresponding relation between the luminous color temperature, the flash power and the control parameters.
Specifically, the corresponding relation between the luminous color temperature, the flash power and the control parameters can be embodied in the form of a table or a curve. The system can be embodied in the form of tables or curves and can be stored in a storage circuit in a data line transmission and network downloading mode.
The control parameters corresponding to the target luminescence color temperature can be determined by searching and comparing the luminescence color temperature and the control parameters under specific flash power.
When the control unit 30 obtains the target emission color temperature and the target flash power, the control parameters can be found based on the preset emission color temperature, flash power and control parameters, so as to generate the voltage regulation signal and the on-off control signal. The power supply circuit 10 outputs a corresponding voltage according to the voltage regulation signal, and the trigger circuit 20 controls the duration of the flash of the light emitting unit 10 according to the on-off control signal, so that the value of the light emitting color temperature output by the light emitting unit 10 is matched with the target light emitting color temperature, and the flash power of the light emitting unit 10 is matched with the target power. According to the embodiment, the storage circuit is arranged, and the corresponding relation between the control parameters and the luminous color temperature is pre-stored in the storage circuit, so that the accuracy of matching the target luminous color temperature is improved.
In this embodiment, the flash power is set at the same time to further improve the accuracy of color temperature control. The flash power affects the brightness of the light emitting unit 10, so by adjusting the flash light emission color temperature in combination with the brightness of the light emitting unit 10, the accuracy of color temperature control can be improved.
In one embodiment, the preset corresponding relation between the luminous color temperature, the flash power and the control parameters is obtained from a color temperature control database, and the luminous color temperature sampling database is generated by the following method:
The light emitting unit 10 is controlled to emit light with a plurality of sets of specific control parameters.
For each set of control parameters, acquiring the emission color temperature and the flash power of the corresponding light emitting unit 10;
And establishing corresponding relations between the control parameters and the luminous color temperature and the flash power of the luminous unit 10, and integrating a plurality of groups of corresponding relations to generate a color temperature control database.
Specifically, the control unit 30 controls the power supply circuit 10 and the trigger circuit 20 in accordance with specific control parameters. Specifically, the power supply circuit 10 outputs a specific power supply voltage, and the trigger circuit 20 controls the flashing of the light emitting unit 10 for a specific period of time. Illustratively, a plurality of supply voltages and on-off duty ratios of a plurality of switching circuits may be set first. Each power supply voltage and a plurality of on-off duty ratios respectively form a group of control parameters. Assuming here that four supply voltages are set, the on-off duty cycles of the four switching circuits enable 16 sets of control parameters to be formed.
Specifically, for each control parameter, the emission color temperature of the light emitting unit 10 under that control parameter is detected by the emission color temperature detection means. The power detection circuit detects a flash power under the control parameter. The emission color temperature data and the flash power are stored in the control unit 30.
And then, the sampled luminous color temperature and the sampled flash power of the luminous unit 10 are subjected to data arrangement, and a corresponding relation with control parameters is established to form a color temperature control database.
In step S52, the power supply circuit 10 may be adjusted first, and then the trigger circuit 20 may be adjusted. Of course, the reverse is also possible.
In one embodiment, to further improve the efficiency of color temperature adjustment. The scheme also comprises the following steps:
acquiring a set light-emitting mode;
according to the corresponding relation between the preset luminous color temperature and the control parameter, determining the control parameter corresponding to the target luminous color temperature comprises the following steps:
And determining control parameters corresponding to the target luminous color temperature and the set luminous mode according to the corresponding relation among the preset luminous mode, luminous color temperature and the control parameters. The control parameters include a main control object and an auxiliary control object (the control objects are the power supply circuit 10 and the trigger circuit 20). Therefore, even if the target emission color temperature is the same, but the emission patterns are different, the finally determined control parameters are different, and it is possible that one is the power supply circuit 10 as the main control object (at this time, the trigger circuit 20 does not adjust or does only make only a few adjustments). The other may be to have the trigger circuit 20 as the primary control object (where the power supply circuit 10 does not adjust or only makes a small number of adjustments).
Depending on the type of flash lamp, the brand of flash lamp, the lighting modes may be various, such as a normal lighting mode, a flashing mode, a cyclic lighting mode, a partial lighting mode, and the like.
In another embodiment, the method further comprises:
acquiring a set light emission pattern of the light emitting unit 10;
determining control parameters corresponding to the target luminous color temperature and the target flash power according to the preset corresponding relation between the luminous color temperature, the flash power and the control parameters, wherein the method comprises the following steps:
and determining control parameters corresponding to the set light emitting mode and the target flash power according to the corresponding relation among the preset light emitting mode, the light emitting color temperature, the flash power and the control parameters.
Similarly, even if the target emission color temperature is the same and the target flash power is the same, but the emission pattern is different, the finally determined control parameters are different, and it is possible that one is the main control object of the power supply circuit 10 (at this time, the trigger circuit 20 does not adjust or does only make a small number of adjustments). The other may be the primary control object of the trigger circuit 20.
According to another aspect of the present application, there is also provided a flash device including a light emitting unit 10 and a flash color temperature control circuit electrically connected to the light emitting unit 10 for adjusting a light emission color temperature of the light emitting unit 10. Specific embodiments of the flash color temperature control circuit are described above.
Claims (12)
1. A flash color temperature control circuit, comprising:
the power supply circuit is provided with a first controlled end and an electric energy output end, wherein the first controlled end is used for receiving a voltage regulation signal, and the electric energy output end is used for electrically connecting a light-emitting unit of the flash lamp so as to supply power to the light-emitting unit according to the voltage regulation signal;
the trigger circuit is provided with a second controlled end and a trigger control end, wherein the second controlled end is used for receiving an on-off control signal, and the trigger control end is electrically connected with the power supply loop so as to adjust the duration of the flash of the light-emitting unit according to the on-off control signal;
The control unit is electrically connected with the first controlled end and the second controlled end, and is used for adjusting the luminous color temperature of the luminous unit by sending the voltage adjusting signal to the first controlled end and sending the on-off control signal to the second controlled end;
The color temperature sampling circuit is used for being electrically connected with the color temperature detection device to sample the luminous color temperature of the luminous unit detected by the color temperature detection device;
The storage circuit is used for storing the corresponding relation between the luminous color temperature and the control parameter, wherein the control parameter comprises the power supply voltage information of the luminous unit and the duration information of the luminous unit flash;
the control unit is used for:
according to the set control parameters, the power supply circuit is controlled to output the set power supply voltage, and the trigger circuit is used for controlling the flashing of the light-emitting unit to last for a set duration;
generating a set corresponding relation between the control parameter and the luminescence color temperature according to the color temperature value obtained by the color temperature sampling circuit, continuously converting and setting the control parameter, and circularly generating a set corresponding relation between the control parameter and the luminescence color temperature to obtain the corresponding relation between the luminescence color temperature and the control parameter;
And generating the voltage regulating signal and the on-off control signal according to the corresponding relation between the luminous color temperature and the control parameter and the target luminous color temperature to be achieved.
2. The flash color temperature control circuit of claim 1, wherein the control unit comprises a main control circuit having a first control terminal and a second control terminal;
The first control end is electrically connected with the first controlled end and is used for sending the voltage regulating signal to the first controlled end;
the second control end is electrically connected with the second controlled end and is used for sending the on-off control signal to the second controlled end.
3. The flash color temperature control circuit of claim 1, wherein the control unit comprises a first control circuit and a second control circuit;
The first control circuit is electrically connected with the first controlled end and is used for sending the voltage regulating signal to the first controlled end;
The second control circuit is electrically connected with the second controlled end and is used for sending the on-off control signal to the second controlled end.
4. The flash color temperature control circuit of claim 1, wherein the power supply circuit comprises a voltage regulation circuit and an energy storage circuit connected in series;
The control end of the voltage regulating circuit is connected with the control unit so as to output specific voltage under the control of the control unit;
The energy storage circuit is used for connecting the light-emitting units, the energy storage circuit stores electric energy output by the voltage regulating circuit, and the output voltage of the energy storage circuit is larger than or equal to the light-emitting trigger voltage of the light-emitting units.
5. The flash color temperature control circuit of claim 4, wherein the voltage regulating circuit comprises a forward circuit or a flyback circuit having a transformer therein, a primary winding of the transformer being connected to the power supply, and a secondary winding of the transformer being connected to the tank circuit.
6. The flash color temperature control circuit of claim 1, wherein the trigger circuit comprises a switch circuit, wherein a controlled end of the switch circuit is connected with the control unit, and a first end and a second end of the switch circuit are connected in series in the power supply loop;
The control unit controls the on-off of the power supply loop by controlling the on-off of the switch circuit.
7. The flash color temperature control circuit of claim 1, wherein the on-off control signal is a PWM signal, and the control unit regulates the duration of the flash of the light emitting unit by adjusting the duty cycle of the on-off control signal.
8. The flash lamp color temperature control circuit according to any one of claims 1 to 7, wherein the control unit further comprises a storage circuit storing a correspondence relationship of a light emission color temperature, a flash power and a control parameter, wherein the control parameter comprises supply voltage information of the light emitting unit and flash duration information of the light emitting unit;
the control unit generates the voltage regulating signal and the on-off control signal according to the corresponding relation between the luminous color temperature and the flash power and the control parameters, and the target luminous color temperature and the target flash power to be achieved.
9. A flash device comprising a light emitting unit and the flash color temperature control circuit according to any one of claims 1 to 8;
the flash lamp color temperature control circuit is electrically connected with the light-emitting unit and used for adjusting the light-emitting color temperature of the light-emitting unit.
10. A flash color temperature control method applied to the flash color temperature control circuit of any one of claims 1 to 8, characterized by comprising:
acquiring a target luminous color temperature to be achieved by a luminous unit of the flash lamp;
Determining a control parameter corresponding to the target luminous color temperature according to a corresponding relation between a preset luminous color temperature and the control parameter, wherein the control parameter comprises the luminous unit power supply voltage information and the luminous unit flash duration information;
And controlling the power supply voltage of the light emitting unit and the duration of the flashing of the light emitting unit according to the determined control parameters.
11. The method according to claim 10, wherein the method further comprises:
Acquiring target flash power to be achieved by the light emitting unit;
the determining the control parameter corresponding to the target luminescence color temperature according to the corresponding relation between the preset luminescence color temperature and the control parameter comprises the following steps:
and determining control parameters corresponding to the target luminous color temperature and the target flash power according to the preset corresponding relation between the luminous color temperature, the flash power and the control parameters.
12. The method according to claim 11, wherein the preset correspondence of the emission color temperature, the flash power and the control parameter is obtained from a color temperature control database, and the color temperature control database is generated by:
Controlling the light-emitting unit to emit light by using a plurality of groups of specific control parameters;
For each group of control parameters, acquiring the luminous color temperature and the flash power of the corresponding luminous unit;
and establishing corresponding relations between the control parameters and the luminous color temperature and the flash power of the luminous unit, and generating a plurality of groups of corresponding relation sets into the color temperature control database.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110184900.6A CN112882318B (en) | 2021-02-10 | 2021-02-10 | Flashlight color temperature control circuit and control method, and flashlight device |
| PCT/CN2021/085357 WO2022170673A1 (en) | 2021-02-10 | 2021-04-02 | Flash-lamp color temperature control circuit, flash-lamp color temperature control method, flash-lamp color temperature control apparatus, electronic device and computer storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110184900.6A CN112882318B (en) | 2021-02-10 | 2021-02-10 | Flashlight color temperature control circuit and control method, and flashlight device |
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| CN112882318A CN112882318A (en) | 2021-06-01 |
| CN112882318B true CN112882318B (en) | 2025-10-03 |
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| DE102007043093A1 (en) * | 2007-09-10 | 2009-03-12 | Bron Elektronik Ag | Color temperature control of flash units |
| JP5327872B2 (en) * | 2009-11-25 | 2013-10-30 | Ｎｅｃライティング株式会社 | Illumination device and dimming mode switching method |
| SE535271C2 (en) * | 2010-07-20 | 2012-06-12 | Profoto Ab | A flash device and a method for controlling the color temperature of the light in a flash |
| JP5704855B2 (en) * | 2010-07-30 | 2015-04-22 | キヤノン株式会社 | Light emitting device, imaging device, and light emission control method |
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| JP6254616B2 (en) * | 2013-02-13 | 2017-12-27 | プロフォト・アーベー | Driver circuit for flash tube |
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| US4853600A (en) * | 1986-04-11 | 1989-08-01 | Urs Zeltner | Flash apparatus with color temperature control |
| CN112799267A (en) * | 2021-01-22 | 2021-05-14 | 深圳市影友摄影器材有限公司 | External flash and color correction system of external flash |
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