WO2022170673A1

WO2022170673A1 - Flash-lamp color temperature control circuit, flash-lamp color temperature control method, flash-lamp color temperature control apparatus, electronic device and computer storage medium

Info

Publication number: WO2022170673A1
Application number: PCT/CN2021/085357
Authority: WO
Inventors: 曾伟玲
Original assignee: 深圳市影友摄影器材有限公司
Priority date: 2021-02-10
Filing date: 2021-04-02
Publication date: 2022-08-18

Abstract

Provided in the present disclosure are a flash-lamp color temperature control circuit, a flash-lamp color temperature control method, a flash-lamp color temperature control apparatus, an electronic device and a computer storage medium. The flash-lamp color temperature control circuit comprises a power supply circuit, a trigger circuit and a control unit, wherein the power supply circuit has a first controlled end and an electric energy output end; the electric energy output end is electrically connected to a light-emitting unit of a flash lamp, so as to supply power to the light-emitting unit according to a voltage adjustment signal; the power supply circuit and the light-emitting unit are connected in series to form a power supply loop; the trigger circuit has a second controlled end and a trigger control end; the trigger control end is electrically connected to the power supply loop, so as to adjust a flash duration of the light-emitting unit according to a turning-on/turning-off control signal; and the control unit is electrically connected to both the first controlled end and the second controlled end, and sends the voltage adjustment signal to the first controlled end and sends the turning-on/turning-off control signal to the second controlled end, so as to adjust the light emission color temperature of the light-emitting unit. By means of the present disclosure, the flexibility of color temperature adjustment of a flash lamp can be improved.

Description

Flash color temperature control circuit, flash color temperature control method, flash color temperature control device, electronic equipment, computer storage medium

technical field

The present disclosure relates to the field of photographic equipment, and in particular, to a flash color temperature control circuit, a flash color temperature control method, a flash color temperature control device, electronic equipment, and a computer storage medium.

Background technique

With the development of mobile communication technology, mobile terminals play an increasingly important role in people's life and work. Especially some mobile terminal devices with camera functions, such as mobile phones, MP4, PDA, notebook computers, etc., the camera functions of these mobile terminals have brought great fun to people's lives. Taking pictures requires a light source. In addition to natural light, artificial light is often needed to assist in taking pictures. The artificial light source that comes with a mobile terminal with a camera function often cannot meet the actual needs of use. For this reason, people often use an external flash to assist in taking pictures.

However, the color temperature adjustment in the external flash generally has only a few fixed gears, which is inflexible and cannot meet the requirements for the color temperature of the external flash in various shooting environments.

The above information disclosed in this Background section is only for enhancement of understanding of the background of the disclosure 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.

SUMMARY OF THE INVENTION

One objective of the present disclosure is to provide a flash color temperature control circuit, so as to improve the flexibility of adjusting the flash color temperature.

In order to solve the above-mentioned technical problems, the present disclosure adopts the following technical solutions:

A flash color temperature control circuit, comprising:

A power supply circuit has a first controlled end and an electric energy output end; the first controlled end is used for receiving a voltage regulation signal; the electric energy output end is electrically connected to the light-emitting unit of the flash lamp, so as to adjust the signal according to the voltage supplying power to the light-emitting unit; the power supply circuit is connected in series with the light-emitting unit to form a power supply loop;

The trigger circuit has a second controlled terminal and a trigger control terminal; the second controlled terminal is used for receiving an on-off control signal, and the trigger control terminal is electrically connected with the power supply circuit to be used according to the on-off control signal adjusting the flash duration of the light-emitting unit;

a control unit, which is electrically connected to the first controlled end and the second controlled end, and sends the voltage adjustment signal to the first controlled end and to the second controlled end The on-off control signal is used to adjust the light-emitting color temperature of the light-emitting unit.

According to an embodiment of the present disclosure, the control unit includes a main control circuit, and the main control circuit has a first control terminal and a second control terminal;

the first control terminal is electrically connected to the first controlled terminal for sending the voltage adjustment signal to the first controlled terminal;

The second control terminal is electrically connected to the second controlled terminal for sending the on-off control signal to the second controlled terminal.

According to an embodiment of the present disclosure, the control unit includes a first control circuit and a second control circuit;

the first control circuit is electrically connected to the first controlled terminal for sending the voltage adjustment signal to the first controlled terminal;

The second control circuit is electrically connected to the second controlled terminal for sending the on-off control signal to the second controlled terminal.

According to an embodiment of the present disclosure, the power supply circuit includes a voltage regulation circuit and an energy storage circuit connected in series;

The input end of the voltage regulation circuit is connected to a power supply, and the output end of the voltage regulation circuit is connected to the energy storage circuit; the controlled end of the voltage regulation circuit is connected to the control unit, so as to be connected to the control unit Under the control of , output a specific voltage;

The energy storage circuit is connected to the light-emitting unit, the energy storage circuit stores the electrical energy output by the voltage regulation circuit, and the output voltage of the energy storage circuit is greater than or equal to the light-emitting trigger voltage of the light-emitting unit.

According to an embodiment of the present disclosure, the voltage regulation circuit includes a forward excitation circuit or a flyback circuit, and the forward excitation circuit or the flyback circuit has a transformer, the primary winding of the transformer is connected to the power supply, and the secondary winding of the transformer is connected to the power supply. The stage winding is connected to the energy storage circuit.

According to an embodiment of the present disclosure, the trigger circuit includes a switch circuit; a controlled end of the switch circuit is connected to 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 circuit by controlling the on-off of the switch circuit.

According to an embodiment of the present disclosure, the switch circuit includes one or more cascaded insulated gate bipolar transistors;

The gate of the insulated gate bipolar transistor is the controlled terminal, the collector of the insulated gate bipolar transistor is the first terminal, and the emitter of the insulated gate bipolar transistor is the second terminal. end.

According to an embodiment of the present disclosure, the on-off control signal is a PWM signal, and the control unit regulates the flash duration of the light-emitting unit by adjusting the duty ratio of the on-off control signal.

According to an embodiment of the present disclosure, the control unit further includes a storage circuit, and the storage circuit stores a corresponding relationship between the light-emitting color temperature and a control parameter; wherein the control parameter includes power supply voltage information of the light-emitting unit and the light-emitting unit. Unit flash duration information;

The control unit generates the voltage adjustment signal and the on-off control signal according to the corresponding relationship between the emission color temperature and the control parameter, and the target emission color temperature to be achieved.

According to an embodiment of the present disclosure, the control unit further includes a storage circuit, and the storage circuit stores the corresponding relationship between the light-emitting color temperature, the flash power and the control parameter; wherein the control parameter includes the power supply voltage information of the light-emitting unit and Flash duration information of the light-emitting unit;

The control unit generates the voltage adjustment signal and the on-off control signal according to the corresponding relationship between the luminous color temperature, flash power and control parameters, as well as the target luminous color temperature and target flash power to be achieved.

According to an embodiment of the present disclosure, the light-emitting unit includes a xenon lamp.

According to another aspect of the present disclosure, a flash device is also provided, including a light emitting unit and a flash color temperature control circuit;

The flash color temperature control circuit is electrically connected to the light-emitting unit for adjusting the light-emitting color temperature of the light-emitting unit.

According to another aspect of the present disclosure, a method for controlling the color temperature of a flash is also provided, comprising:

obtaining the target light-emitting color temperature to be achieved by the light-emitting unit of the flash;

Determine the control parameter corresponding to the target light-emitting color temperature according to the preset correspondence between the light-emitting color temperature and the control parameter; wherein, the control parameter includes the power supply voltage information of the light-emitting unit and the flash duration information of the light-emitting unit;

According to the determined control parameters, the power supply voltage of the light-emitting unit and the flashing duration of the light-emitting unit are controlled.

According to an embodiment of the present disclosure, the method further includes:

obtaining the target flash power to be achieved by the light-emitting unit;

The determining the control parameter corresponding to the target luminous color temperature according to the preset correspondence between the luminous color temperature and the control parameter includes:

Control parameters corresponding to the target luminous color temperature and target flash power are determined according to the preset corresponding relationship between the luminous color temperature, the flash power and the control parameters.

According to an embodiment of the present disclosure, the preset corresponding relationship between light emission color temperature, flash power and control parameters is obtained from a color temperature control database; the color temperature control database is generated by the following method:

Controlling the light-emitting unit to emit light with multiple sets of specific control parameters;

For each set of the control parameters, obtain the light-emitting color temperature and flash power of the corresponding light-emitting unit;

A corresponding relationship between the control parameter and the light-emitting color temperature and flash power of the light-emitting unit is established, and the color temperature control database is generated from a plurality of sets of the corresponding relationship sets.

According to an aspect of the present disclosure, a flash color temperature control device is also provided, comprising:

an acquirer for acquiring the target luminous color temperature to be achieved by the light-emitting unit of the flash;

a control parameter determiner, configured to determine a control parameter corresponding to the target light emission color temperature according to a preset corresponding relationship between the light emission color temperature and the control parameter; wherein the control parameter includes the power supply voltage information of the light emission unit and the light emission Unit flash duration information;

The light-emitting unit controller is configured to control the power supply voltage of the light-emitting unit and the flashing duration of the light-emitting unit according to the determined control parameter.

According to an aspect of the present disclosure, an electronic device is also provided, comprising:

The storage unit stores the flash color temperature control program;

The processing unit is configured to execute the steps of the flash color temperature control method when the flash color temperature control program is executed.

According to an aspect of the present disclosure, a computer storage medium is also provided, the computer storage medium stores a flash color temperature control program, and the flash color temperature control program implements the steps of the flash color temperature control method when the flash color temperature control program is executed by at least one processor.

In the present disclosure, the control unit is electrically connected to the first controlled end of the power supply circuit and the second controlled end of the trigger circuit at the same time, the control unit sends a voltage adjustment signal to the first controlled end, and the power supply circuit outputs electric energy according to the voltage adjustment signal The output voltage of the terminal is adjusted, so as to realize the adjustment of the color temperature of the flash light. The control circuit sends an on-off control signal to the second controlled terminal, and the trigger circuit adjusts the flash duration of the light-emitting unit according to the on-off control signal, thereby adjusting the light-emitting color temperature of the light-emitting unit. Therefore, by adjusting the power supply voltage of the light-emitting voltage and the duration of the flash, the flexibility of the color temperature adjustment is improved.

It is to be understood that the foregoing general description and the following detailed description are exemplary only and do not limit the present disclosure.

Description of drawings

The above and other objects, features and advantages of the present disclosure will become more apparent from the detailed description of example embodiments thereof with reference to the accompanying drawings.

FIG. 1 is a block diagram of a circuit structure of a flash color temperature control circuit according to an embodiment.

FIG. 2 is a circuit connection block diagram of a control unit, a power supply circuit, and a trigger circuit according to an embodiment.

FIG. 3 is a circuit structure block diagram of a flash color temperature control circuit according to another embodiment.

FIG. 4 is a flow chart of a method for controlling the color temperature of a flashlight according to an embodiment.

Fig. 5 shows a flash color temperature control device according to an embodiment.

Fig. 6 is a system architecture diagram of an electronic device according to an embodiment.

Detailed ways

While the present disclosure may readily be embodied in different forms of embodiment, only some of the specific embodiments are shown in the drawings and will be described in detail in this specification, while it is to be understood that this specification is to be regarded as the Exemplary illustrations of principles are disclosed, and are not intended to limit the disclosure to those described herein.

Thus, a reference to a feature in this specification will be used to describe one of the features of an embodiment of the present disclosure and not to imply that every embodiment of the present disclosure must have the described feature. Furthermore, it should be noted that this specification describes a number of features. Although certain features may be combined together to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Thus, unless otherwise stated, the combinations described are not intended to be limiting.

In the embodiments shown in the drawings, directional indications (such as up, down, left, right, front and rear) are used to explain the structure and movement of various elements of the present disclosure not absolute but relative. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indications of these directions change accordingly.

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this description of the present disclosure will be thorough and complete, and will consolidate the concept of the example embodiments. It will be fully conveyed to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated descriptions will be omitted.

The preferred embodiments of the present disclosure will be further elaborated below with reference to the accompanying drawings of the present specification.

The embodiment of the present disclosure provides a flash color temperature control circuit, which is used for regulating the light emission color temperature of the flash light emitting unit 40 . Please refer to FIG. 1 , which is a block diagram of a circuit structure of a color temperature control circuit of a flashlight 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 has a first controlled terminal and a power output terminal; the first controlled terminal is used for receiving a voltage adjustment signal; the power output terminal is electrically connected to the light-emitting unit 40 of the flash lamp, so as to supply power to the light-emitting unit 40 according to the voltage adjustment signal; The circuit 10 and the light-emitting unit 40 are connected in series to form a power supply loop; the trigger circuit 20 has a second controlled terminal and a trigger control terminal; the second controlled terminal is used to receive an on-off control signal, and the trigger control terminal is electrically connected to the power supply circuit to be connected according to the on-off control signal. The flashing duration of the light-emitting unit 40 is adjusted by turning off the control signal; the control unit 30 is electrically connected to the first controlled terminal and the second controlled terminal, and sends a voltage adjustment signal to the first controlled terminal and to the second controlled terminal. The terminal sends an on-off control signal to adjust the light-emitting color temperature of the light-emitting unit 40 .

Here, the specific structure of the light emitting unit 40 is not limited. In one embodiment, the light emitting unit 40 includes a xenon lamp. The light-emitting unit 40 generally has a trigger coil in it. The light-emitting unit 40 is powered by applying a supply voltage to both ends of the trigger coil.

In an example, the light-emitting unit 40 includes a xenon lamp, and the lamp tube of the xenon lamp has xenon gas. When the voltage loaded on the trigger coil is higher than the trigger voltage, the strong electric shocks the xenon gas in the lamp tube, and the xenon gas emits strong light. , to realize the flashing of the light-emitting unit 40 .

The power output terminal of the power supply circuit 10 and the trigger coil of the light-emitting unit 40 form a power supply loop. When the power supply loop is turned on, the power supply voltage output by the power output terminal of the power supply circuit 10 is applied to the light-emitting unit 40, so that the light-emitting unit 40 emits light. The higher the supply voltage of the light-emitting unit 40 is, the higher the color temperature of the light-emitting unit 40 is.

Please refer to FIG. 2 , which is a block diagram of 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 regulation circuit 11 and an energy storage circuit 12 connected in series; the input end of the voltage regulation circuit 11 is connected to the power supply, and the output end of the voltage regulation circuit 11 is connected to the energy storage circuit 12; the voltage regulation The controlled end of the circuit 11 is connected to the control unit 30 to output a specific voltage under the control of the control unit 30; the energy storage circuit 12 is connected to the light-emitting unit 40, and the energy storage circuit 12 stores the electric energy output by the voltage regulation circuit 11, and The output voltage of the tank circuit 12 is greater than or equal to the trigger voltage of the light-emitting unit 40 to emit light.

The power source here can be external, or it can be a battery inside the flash. Depending on the power supply voltage, the voltage regulating circuit 11 can be a step-down circuit or a step-up circuit. The step-down circuit can be a buck circuit, or a charge pump circuit. The boost circuit may be a BOOST circuit.

In an example, the voltage regulation circuit 11 includes a forward circuit or a flyback circuit, the forward circuit or the flyback circuit has a transformer and a control switch, the primary winding of the transformer is connected to the power supply, and the secondary winding of the transformer is connected to the energy storage circuit 12 . The control switch is connected in series with the primary winding, and its on-off is controlled by the control unit 30 .

Taking the forward circuit as an example, the primary winding of the transformer in the positive circuit can be directly connected to the AC power source, or can be connected to the DC power source through an inverter circuit. Because the light-emitting unit 40 needs a higher power supply voltage to trigger the xenon gas to emit light. Therefore, its power supply security needs to be considered. In this embodiment, since the voltage conversion function is realized by a transformer in the forward excitation circuit, and the isolation function of the transformer is used, the input end and the output end of the voltage regulation circuit 11 in this embodiment have better isolation performance, thereby improving the The safety of the input side of the voltage regulation 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. Here, the capacitance of the energy storage circuit 12 should be 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 40 . That is, when the trigger voltage is reached and the power supply circuit is turned on, the flasher will emit light.

The trigger circuit 20 is electrically connected to the power supply circuit. In one example, the trigger circuit 20 may be connected to the light-emitting unit 40, and when the trigger unit sends a trigger signal, a certain structure inside the light-emitting unit 40 operates to turn on the power supply circuit, so that the light-emitting unit 40 emits light. In another example, the trigger circuit 20 includes a switch circuit; the controlled end of the switch circuit is connected to the control unit 30, and the first end and the second end of the switch circuit are connected in series in the power supply loop; to control the on-off of the power supply circuit.

In this case, the switch circuit may include one or more cascaded switch tubes. If there are multiple switch tubes, they may be connected in parallel or in series to increase the power that can be turned on and off. Specifically, the switch tube may be a MOS tube or an IGBT. Taking an IGBT as an example, the gate of the IGBT is the controlled terminal, the emitter is the second terminal, and the collector is the first terminal.

Therefore, when the switch circuit is turned off, the power supply circuit is cut off, so that the light emitting unit 40 is turned off; when the switch circuit is turned on, the power supply circuit is turned on, so that the light emitting unit 40 flashes. The longer the flash duration of the light-emitting unit 40 is, the lower the color temperature of the light emitted by the light-emitting unit 40 is. The shorter the flash duration of the light-emitting unit 40 is, the higher the color temperature of the light emitted by the light-emitting unit 40 is. The flash duration here may refer to the duration of the flash in one flash-off cycle of the light-emitting unit 40 . Of course, if the flashing-extinguishing period is too short, the human eye cannot recognize the off state of the light-emitting unit 40 .

Here, the on-off control signal sent by the control unit 30 may be a PWM signal, and the control unit 30 regulates the flash duration of the light-emitting unit 40 by adjusting the duty ratio of the on-off control signal. Here, the switch tube in the switch circuit can be switched on and off at a higher on-off frequency to the extent that the human eye cannot perceive it, and the light-emitting unit can be regulated by adjusting the on-time/duty ratio of the switch tube in the on-off cycle. 40 luminous color temperature.

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. The output voltage of the output terminal is adjusted, so as to realize the adjustment of the color temperature of the flash light. The control circuit sends an on-off control signal to the second controlled terminal, and the trigger circuit 20 adjusts the flash duration of the light-emitting unit 40 according to the on-off control signal, thereby adjusting the light-emitting color temperature of the light-emitting unit 40 . Therefore, by adjusting the supply voltage of the light-emitting voltage and the duration of the flash, the adjustment range of the light-emitting color temperature and the fineness of the light-emitting color temperature adjustment are increased.

For example, when it is necessary to adjust to a certain light-emitting color temperature value, the power supply voltage of the light-emitting unit 40 can be adjusted for coarse adjustment, and then the flash duration of the light-emitting unit 40 can be adjusted for fine adjustment, thereby improving the light-emitting color temperature adjustment. precision.

In one embodiment, the control unit 30 includes a main control circuit, and the main control circuit has a first control terminal and a second control terminal; the first control terminal is electrically connected to the first controlled terminal, and is used for sending the first controlled terminal to the first controlled terminal. A voltage adjustment signal is sent; the second control terminal is electrically connected to the second controlled terminal, so as to send an on-off control signal to the second controlled terminal.

The main control circuit here 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 at the same time by one main control circuit, the arrangement of communication lines can be reduced, the coordination of the control of the power supply circuit 10 and the trigger circuit 20 can be improved, and the stability of the flash color temperature adjustment process can be improved.

Please refer to FIG. 3 . FIG. 3 is a circuit connection block diagram of a control unit, a power supply circuit, and a trigger circuit according to an embodiment. In another embodiment, the control unit 30 includes a first control circuit 31 and a second control circuit 32; the first control circuit 31 is electrically connected to the first controlled terminal for sending a voltage adjustment signal to the first controlled terminal ; The second control circuit 32 is electrically connected to the second controlled end for sending an on-off control signal to the second controlled end.

Here, the first control circuit 31 may be one of a single-chip microcomputer, an MCU, and a CPU. The second control circuit 32 may also be one of a single-chip microcomputer, an MCU, and a CPU. This embodiment implements independent control of the power supply circuit 10 and the trigger circuit 20 . In the event that the first control circuit 31 fails, the second control circuit 32 can still adjust the light-emitting color temperature by controlling the flash duration of the light-emitting unit 40 . Or when the second control circuit 32 fails, the first control circuit can still adjust the light-emitting color temperature by controlling the power supply voltage of the light-emitting unit 40 . Therefore, the present embodiment improves the reliability of the color temperature control of the flashlight.

In one embodiment, the flash color temperature control circuit further includes a storage circuit, and the storage circuit stores the corresponding relationship between the control parameters and the light emission color temperature; wherein, the control parameters include the power supply voltage information of the light emitting unit 40 and the flash duration information of the light emitting unit 40; control The controller generates a voltage adjustment signal and an on-off control signal according to the corresponding relationship between the control parameters and the luminous color temperature, as well as the target luminous color temperature to be achieved.

Here, the flashing duration information of the light-emitting unit 40 may specifically include the specific flashing duration of the light-emitting unit 40, and may also include the duty ratio of the on-off control signal.

The storage circuit may include a hard disk. The corresponding relationship between the control parameter and the luminous color temperature may be embodied in the form of a table or a curve. The corresponding relationship between the control parameters and the luminous color temperature can be stored in the storage circuit by means of data line transmission and network download.

In an embodiment, the target light emission color temperature may be generated by the flash according to the shooting environment and based on a specific algorithm, or may be set by the user. Here, it can be set that the flash also includes human-computer interaction components, such as buttons, touch screens, voice input components, etc., for the user to input the target luminous color temperature.

When the control unit 30 obtains the target light emission color temperature, the control parameters can be found based on the preset corresponding relationship between the control parameters and the light emission color temperature, thereby generating a voltage adjustment signal and an on-off control signal. The power supply circuit 10 outputs the corresponding voltage according to the voltage regulation signal, and the trigger circuit 20 controls the flash duration of the light-emitting unit 40 according to the on-off control signal, so that the light-emitting color temperature value output by the light-emitting unit 40 matches the target light-emitting color temperature. In this embodiment, by setting a storage circuit and setting the storage circuit to pre-store the corresponding relationship between the control parameters and the luminous color temperature, the accuracy of matching the target luminous color temperature is improved.

In another embodiment, the flash color temperature control circuit further includes a storage circuit, and the storage circuit stores the corresponding relationship between the light emission color temperature, the flash power and the control parameters; wherein, the control parameters include the power supply voltage information of the light emitting unit 40 and the flashing of the light emitting unit 40. Duration information; the controller generates a voltage adjustment signal and an on-off control signal according to the corresponding relationship between the luminous color temperature, flash power and control parameters, as well as the target luminous color temperature and target flash power to be achieved.

Specifically, the corresponding relationship between the luminous color temperature, the flash power and the control parameters can be embodied in the form of a table and a curve, and stored in the storage circuit in the form of data line transmission and network download.

After the control unit 30 obtains the target light emission color temperature and the target flash power, the control parameters can be found based on the preset light emission color temperature, flash power and control parameters, thereby generating a voltage adjustment signal and an on-off control signal. The power supply circuit 10 outputs the corresponding voltage according to the voltage regulation signal, and the trigger circuit 20 controls the flash duration of the light-emitting unit 40 according to the on-off control signal, so that the light-emitting color temperature value output by the light-emitting unit 40 matches the target light-emitting color temperature, and the flash power of the light-emitting unit 40 Match the target power. In this embodiment, by setting a storage circuit and setting the storage circuit to pre-store the corresponding relationship between the control parameters and the luminous color temperature, the accuracy of matching the target luminous color temperature is improved.

In this embodiment, the flash power is controlled at the same time, so as to further improve the accuracy of the color temperature control. The flash power affects the brightness of the light emitting unit 40 , so by adjusting the color temperature of the flash light in combination with the brightness of the light emitting unit 40 , the accuracy of the color temperature control can be improved.

Here, the generation process of the corresponding relationship between the emission color temperature, the flash power and the control parameter is taken as an example for description.

In one embodiment, the flash color temperature control circuit further includes a color temperature sampling circuit; the color temperature sampling circuit is used for electrically connecting the color temperature detection device to sample the light-emitting color temperature of the light-emitting unit 40 detected by the color temperature detection device; the color temperature sampling circuit and the control unit 30 electrical connection.

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 40 to last for a specific period of time. The control unit 30 generates the corresponding relationship between the above-mentioned specific control parameters and the emission color temperature according to the color temperature value obtained by the color temperature sampling circuit. Constantly changing the control parameters and looping the process of determining the corresponding relationship, that is, the color temperature control database can be formed.

Here, the emission color temperature detection device may be an emission color temperature sensor.

In another embodiment, the flash color temperature control circuit further includes a power detection circuit; the power detection circuit is electrically connected to the power supply circuit 10 to detect the flash power of the light-emitting unit 40; the control circuit is electrically connected to the power detection circuit to obtain the flash power. The power detection circuit may include a voltage detection circuit and a current detection circuit to detect the voltage and current of the light-emitting unit 40 correspondingly.

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 is controlled to control the flashing of the light-emitting unit 40 to last for a specific period of time. The control unit 30 generates the corresponding relationship between the above-mentioned specific control parameters and the light-emitting color temperature and flash power of the light-emitting unit 40 according to the light-emitting color temperature value obtained by the color temperature sampling circuit and the flash power detected by the power detection circuit. Constantly changing the control parameters and looping the process of determining the corresponding relationship, that is, the color temperature control database can be formed.

Please refer to FIG. 4 , which is a flowchart of a method for controlling the color temperature of a flash according to an embodiment. In the following embodiments, the embodiments of the flash color temperature control method will be described.

In one embodiment, the flash color temperature control method includes:

S50 , acquiring a target light-emitting color temperature to be achieved by the light-emitting unit 40 of the flash.

As before, the target emission color temperature may be generated by the flash according to the shooting environment and based on a specific algorithm, or may be set by the user.

S51 , determining a control parameter corresponding to the target luminous color temperature according to the preset correspondence between the luminous color temperature and the control parameter; wherein the control parameter includes the power supply voltage information of the light emitting unit 40 and the flashing duration information of the light emitting unit 40 .

The corresponding relationship between the preset luminous color temperature and the control parameter is stored in the storage circuit. The power supply voltage information of the light emitting unit 40 includes the voltage value of the power supply voltage. The flash duration information of the light emitting unit 40 includes the specific value of the flash duration, or the ratio (duty ratio) of the on-time to the off-time in the on-off cycle of the flash.

S52 , according to the determined control parameter, control the power supply voltage of the light-emitting unit 40 and the flashing duration of the light-emitting unit 40 .

In another embodiment, the method further includes:

The target flash power to be achieved by the light-emitting unit 40 is obtained.

Here, the target flash power can be calculated by the power detection circuit.

S51, according to the preset corresponding relationship between the luminous color temperature and the control parameter, determine the control parameter corresponding to the target luminous color temperature; wherein, the control parameter includes the power supply voltage information of the light-emitting unit 40 and the flashing duration information of the light-emitting unit 40, including:

Control parameters corresponding to the target luminous color temperature and the target flash power are determined according to the preset correspondence between the luminous color temperature, the flash power and the control parameters.

Here, the control parameters of the emission color temperature under a specific flash power can be determined by searching and comparing, and then the target emission color temperature can be compared to determine the control parameters corresponding to the target emission color temperature.

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 40 , so by adjusting the color temperature of the flash light in combination with the brightness of the light emitting unit 40 , the accuracy of the color temperature control can be improved.

In one embodiment, the preset corresponding relationship between luminous color temperature, flash power and control parameters is obtained from a color temperature control database; the luminous color temperature sampling database is generated by the following methods:

The lighting unit 40 is controlled to emit light with a plurality of sets of specific control parameters.

For each set of control parameters, obtain the light-emitting color temperature and flash power of the corresponding light-emitting unit 40;

A corresponding relationship between the control parameters and the light-emitting color temperature and flash power of the light-emitting unit 40 is established, and a color temperature control database is generated by collecting a plurality of sets of corresponding relationships.

Specifically, 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 40 to last for a specific period of time. Illustratively, multiple power supply voltages and on-off duty ratios of multiple switch circuits may be set first. Each supply voltage and multiple on-off duty ratios respectively form a set of control parameters. It is assumed here that four power supply voltages and on-off duty ratios of four switch circuits are set, so that 16 groups of control parameters can be formed.

Specifically, for each control parameter, the light-emitting color temperature of the light-emitting unit 40 under the control parameter is detected by a light-emitting color temperature detection device. A power detection circuit detects the flash power under the control parameter. The emission color temperature data and flash power are stored in the control unit 30 .

Then, the sampled light emission color temperature and flash power of the light emitting unit 40 are arranged in data, and the corresponding relationship with the 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, in order to further improve the efficiency of color temperature adjustment. This program also includes:

Get the set lighting mode;

According to the preset correspondence between the luminous color temperature and the control parameters, determine the control parameters corresponding to the target luminous color temperature, including:

Control parameters corresponding to the target luminescence color temperature and the set luminescence mode are determined according to the preset luminescence mode, luminescence color temperature and the corresponding relationship of 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 light emission color temperature is the same, but the light emission mode is different, the final determined control parameters are also different, and one may take the power supply circuit 10 as the main control object (at this time, the trigger circuit 20 is not adjusted or only adjusted a few times). Another possibility is that the trigger circuit 20 is the main control object (at this time, the power supply circuit 10 is not adjusted or only adjusted a few times).

According to different types of flashlights and different brands of flashlights, there can be various lighting modes, such as always-on mode, flashing mode, cycle lighting mode, partial lighting mode, and so on.

In another embodiment, the method further includes:

acquiring the set light-emitting mode of the light-emitting unit 40;

According to the preset correspondence between luminous color temperature, flash power and control parameters, determine the control parameters corresponding to the target luminous color temperature and target flash power, including:

Control parameters corresponding to the set light-emitting mode and target flash power are determined according to the preset light-emitting mode, light-emitting color temperature, flash power, and the corresponding relationship of the control parameters.

Similarly, even if the target light-emitting color temperature is the same, the target flash power is the same, but the light-emitting mode is different, the final determined control parameters are also different, one may take the power supply circuit 10 as the main control object (at this time, the trigger circuit 20 does not adjust or only does few adjustments). Another possibility is that the trigger circuit 20 is the main control object.

According to another aspect of the present disclosure, a flash device is also provided, comprising a light emitting unit 40 and a flash color temperature control circuit; the flash color temperature control circuit is electrically connected to the light emitting unit 40 for adjusting the light emitting color temperature of the light emitting unit 40 . For the specific embodiment of the flash color temperature control circuit, please refer to the above.

Referring to FIG. 5 , the present disclosure also proposes a flash color temperature control device 60 , including an acquirer 61 , a control parameter determiner 62 , and a light-emitting unit controller 63 . The acquirer 61 is used to acquire the target luminous color temperature to be achieved by the light-emitting unit of the flash; the control parameter determiner 62 is used to determine the control parameter corresponding to the target luminous color temperature according to the preset corresponding relationship between the luminous color temperature and the control parameter ; wherein, the control parameters include the power supply voltage information of the light-emitting unit and the flash duration information of the light-emitting unit; the light-emitting unit controller 63 is configured to control the power supply voltage of the light-emitting unit according to the determined control parameters, and the flash duration of the light-emitting unit.

In another embodiment, the acquirer 61 is further configured to acquire the target flash power to be achieved by the light-emitting unit; the control parameter determiner 62 is configured to determine the corresponding relationship between the preset light-emitting color temperature, flash power and control parameters according to the preset Control parameters corresponding to the target luminous color temperature and target flash power.

In another embodiment, the flash color temperature control device 60 includes a light-emitting unit light-emitting controller and a color temperature control database generator for controlling the light-emitting units to emit light with multiple sets of specific control parameters; the acquirer 61 is used for each light-emitting unit to emit light; A set of the control parameters to obtain the light-emitting color temperature and flash power of the corresponding light-emitting unit; the color temperature control database generator is used to establish the corresponding relationship between the control parameters and the light-emitting color temperature and flash power of the light-emitting unit, The set of corresponding relationships generates the color temperature control database.

The present disclosure also provides a computer storage medium, where the computer storage medium stores a flash color temperature control program, and the flash color temperature control program is executed by at least one processor of the steps of the above flash color temperature control method.

The computer-readable storage medium may employ a portable compact disc read only memory (CD-ROM) and include program codes, and may be executed on a terminal device such as a personal computer. However, the program product of the present disclosure is not limited thereto, and in the present disclosure, a readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

According to an aspect of the present disclosure, an electronic device is also provided. FIG. 6 is a system architecture diagram of an electronic device according to an embodiment. Including storage unit, processing unit. The storage unit stores a flash color temperature control program; the processing unit is configured to execute the steps of the flash color temperature control method when the flash color temperature control program is executed.

The components of the electronic device 4 may include but are not limited to: the above-mentioned at least one processing unit 42, the above-mentioned at least one storage unit 41, and a bus 43 connecting different system components (including the storage unit 420 and the processing unit 410), wherein the storage unit 41 stores the Program code, which may be executed by the processing unit 42 to cause the processing unit 42 to perform the steps according to various exemplary embodiments of the present disclosure described in the above-described embodiment section of this specification.

The storage unit 41 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 411 and/or a cache storage unit 412 , and may further include a read only storage unit (ROM) 413 .

The storage unit 41 may also include a program/utility 414 having a set (at least one) of program modules 415 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, An implementation of a network environment may be included in each or some combination of these examples.

The bus 43 may be representative of one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local area using any of a variety of bus structures bus.

The electronic device 4 may also communicate with one or more external devices 50 (eg keyboards, pointing devices, bluetooth devices, etc.), with one or more devices that enable a user to interact with the electronic device 4, and/or with Any device (eg, router, modem, display unit 44, etc.) that enables the robot's electronics 4 to communicate with one or more other computing devices. Such communication may take place through input/output (I/O) interface 45 . Also, the robot's electronics 4 may communicate with one or more networks (eg, a local area network (LAN), a wide area network (WAN), and/or a public network, such as the Internet) via a network adapter 46 . As shown in FIG. 6 , the network adapter 46 communicates with other modules of the electronic device 4 of the robot via the bus 43 . It should be understood that, although not shown in Figure 6, other hardware and/or software modules may be used in conjunction with the robot's electronics 4, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems , tape drives, and data backup storage systems.

While the present disclosure has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is of description and illustration, and not of limitation. Since the present disclosure can be embodied in many forms without departing from the spirit or spirit of the invention, it is to be understood that the above-described embodiments are not limited to any of the foregoing details, but are to be construed broadly within the spirit and scope defined by the appended claims Therefore, all changes and modifications that come within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

A flash color temperature control circuit, comprising:

A power supply circuit has a first controlled end and an electric energy output end; the first controlled end is used for receiving a voltage regulation signal; the electric energy output end is electrically connected to the light-emitting unit of the flash lamp, so as to adjust the signal according to the voltage supplying power to the light-emitting unit; the power supply circuit is connected in series with the light-emitting unit to form a power supply loop;

The trigger circuit has a second controlled terminal and a trigger control terminal; the second controlled terminal is used for receiving an on-off control signal, and the trigger control terminal is electrically connected with the power supply circuit to be used according to the on-off control signal adjusting the flash duration of the light-emitting unit;

a control unit, which is electrically connected to the first controlled end and the second controlled end, and sends the voltage adjustment signal to the first controlled end and to the second controlled end The on-off control signal is used to adjust the light-emitting color temperature of the light-emitting unit.
The flash color temperature control circuit according to claim 1, wherein the control unit comprises a main control circuit, and the main control circuit has a first control terminal and a second control terminal;

the first control terminal is electrically connected to the first controlled terminal for sending the voltage adjustment signal to the first controlled terminal;

The second control terminal is electrically connected to the second controlled terminal for sending the on-off control signal to the second controlled terminal.
The flash color temperature control circuit according to claim 1, wherein the control unit comprises a first control circuit and a second control circuit;

the first control circuit is electrically connected to the first controlled terminal for sending the voltage adjustment signal to the first controlled terminal;

The second control circuit is electrically connected to the second controlled terminal for sending the on-off control signal to the second controlled terminal.
The flash color temperature control circuit according to claim 1, wherein the power supply circuit comprises a voltage regulation circuit and an energy storage circuit connected in series;

The input end of the voltage regulation circuit is connected to a power supply, and the output end of the voltage regulation circuit is connected to the energy storage circuit; the controlled end of the voltage regulation circuit is connected to the control unit, so as to be connected to the control unit Under the control of , output a specific voltage;

The energy storage circuit is connected to the light-emitting unit, the energy storage circuit stores the electrical energy output by the voltage regulation circuit, and the output voltage of the energy storage circuit is greater than or equal to the light-emitting trigger voltage of the light-emitting unit.
The flash color temperature control circuit according to claim 4, wherein the voltage regulation circuit comprises a forward excitation circuit or a flyback circuit, and the forward excitation circuit or the flyback circuit has a transformer, and the primary winding of the transformer is used for the The power supply is connected, and the secondary winding of the transformer is connected with the energy storage circuit.
The flash color temperature control circuit according to claim 1, wherein the trigger circuit comprises a switch circuit; a controlled end of the switch circuit is connected to the control unit, and a first end and a second end of the switch circuit are connected in series in the power supply circuit;

The control unit controls the on-off of the power supply circuit by controlling the on-off of the switch circuit.
The flash color temperature control circuit of claim 6, wherein the switch circuit comprises one or more cascaded insulated gate bipolar transistors;

The gate of the insulated gate bipolar transistor is the controlled terminal, the collector of the insulated gate bipolar transistor is the first terminal, and the emitter of the insulated gate bipolar transistor is the second terminal. end.
The flash color temperature control circuit according to claim 1, wherein the on-off control signal is a PWM signal, and the control unit adjusts the duty cycle of the on-off control signal to control the flash duration of the light-emitting unit duration.
The flash color temperature control circuit according to any one of claims 1 to 8, wherein the control unit further comprises a storage circuit, and the storage circuit stores the corresponding relationship between the emission color temperature and the control parameter; wherein the control parameter includes The power supply voltage information of the light-emitting unit and the flash duration information of the light-emitting unit;

The control unit generates the voltage adjustment signal and the on-off control signal according to the corresponding relationship between the emission color temperature and the control parameter, and the target emission color temperature to be achieved.
The flash color temperature control circuit according to any one of claims 1 to 8, wherein the control unit further comprises a storage circuit, and the storage circuit stores the corresponding relationship between the emission color temperature, the flash power and the control parameters; wherein, the The control parameters include power supply voltage information of the light-emitting unit and flash duration information of the light-emitting unit;

The control unit generates the voltage adjustment signal and the on-off control signal according to the corresponding relationship between the luminous color temperature, flash power and control parameters, as well as the target luminous color temperature and target flash power to be achieved.
The flash color temperature control circuit according to claim 1, wherein the light emitting unit comprises a xenon lamp.
A flashlight device, comprising a light-emitting unit and the flashlight color temperature control circuit according to any one of claims 1 to 11;

The flash color temperature control circuit is electrically connected to the light-emitting unit for adjusting the light-emitting color temperature of the light-emitting unit.
A method for controlling the color temperature of a flash, comprising:

obtaining the target light-emitting color temperature to be achieved by the light-emitting unit of the flash;

Determine the control parameter corresponding to the target light-emitting color temperature according to the preset correspondence between the light-emitting color temperature and the control parameter; wherein, the control parameter includes the power supply voltage information of the light-emitting unit and the flash duration information of the light-emitting unit;

According to the determined control parameters, the power supply voltage of the light-emitting unit and the flashing duration of the light-emitting unit are controlled.
The method of claim 13, wherein the method further comprises:

obtaining the target flash power to be achieved by the light-emitting unit;

The determining the control parameter corresponding to the target luminous color temperature according to the preset correspondence between the luminous color temperature and the control parameter includes:

Control parameters corresponding to the target luminous color temperature and target flash power are determined according to the preset correspondence between luminous color temperature, flash power and control parameters.
The method according to claim 13, wherein, the preset corresponding relationship between luminous color temperature, flash power and control parameters is obtained from a color temperature control database; the color temperature control database is generated by the following method:

Controlling the light-emitting unit to emit light with multiple sets of specific control parameters;

For each set of the control parameters, obtain the light-emitting color temperature and flash power of the corresponding light-emitting unit;

A corresponding relationship between the control parameter and the light-emitting color temperature and flash power of the light-emitting unit is established, and the color temperature control database is generated from a plurality of sets of the corresponding relationship sets.
An electronic device including

The storage unit stores the flash color temperature control program;

The processing unit is configured to execute the steps of the flash color temperature control method according to any one of claims 13 to 15 when the flash color temperature control program is executed.
A flash color temperature control device, comprising:

an acquirer for acquiring the target luminous color temperature to be achieved by the light-emitting unit of the flash;

a control parameter determiner, configured to determine a control parameter corresponding to the target light emission color temperature according to a preset corresponding relationship between the light emission color temperature and the control parameter; wherein the control parameter includes the power supply voltage information of the light emission unit and the light emission Unit flash duration information;

The light-emitting unit controller is configured to control the power supply voltage of the light-emitting unit and the flashing duration of the light-emitting unit according to the determined control parameter.
A computer storage medium storing a flash color temperature control program, which implements the steps of the flash color temperature control method according to any one of claims 13 to 15 when the flash color temperature control program is executed by at least one processor.