Photographic lamp power supply circuit and photographic lamp

Abstract

The utility model provides a photoflood lamp power supply circuit, which comprises a DC power supply, a power conversion circuit, an MCU controller, a constant current circuit and an LED module which are sequentially connected in series, and a battery and a battery charging management circuit which are connected between the DC power supply and the power conversion circuit in series, the battery is a storage battery which can be repeatedly charged and discharged for multiple times; the battery charging management circuit is used for controlling the charging duration and the charging voltage of the battery; the power conversion circuit is used for switching the power supply to the battery power supply when the DC power supply is disconnected; and the MCU controller is used for controlling the working time of the constant current circuit so as to adjust the output power of the LED module. According to the utility model, the power supply circuit of the photoflood lamp is compatible with the power adapter power supply and the battery power supply, so that the photoflood lamp is not limited by the power supply scene of the power adapter power supply any more, the battery can be directly charged in the circuit, and a battery charger does not need to be additionally arranged for the battery.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply circuits, and particularly relates to a power supply circuit for a photographic lamp and a photographic lamp. Background Art

[0002] At present, there are mainly two power supply methods for photographic lamps. One is adapter power supply, and the other is battery power supply. If battery power supply is used, an additional battery charger is required to charge the battery.

[0003] Therefore, it is necessary to design a power supply circuit for a photographic lamp that can charge the battery synchronously when using adapter power supply. Summary of the Utility Model

[0004] Aiming at the defects of the above-mentioned prior art, the purpose of the utility model is to provide a power supply circuit for a photographic lamp, including: a DC power supply, a power conversion circuit, an MCU controller, a constant current circuit, an LED module connected in series in sequence, and a battery and a battery charging management circuit connected in series between the DC power supply and the power conversion circuit;

[0005] The battery is a rechargeable and dischargeable storage battery.

[0006] The battery charging management circuit is used to control the charging duration and charging voltage of the battery.

[0007] The power conversion circuit is used to switch the power supply to battery power supply when the DC power supply is disconnected.

[0008] The MCU controller is used to control the working duration of the constant current circuit, so as to adjust the output power of the LED module.

[0009] Preferably, the MCU controller includes a conversion circuit and a control chip. The conversion circuit is used to convert the input voltage into the working voltage of the control chip, and the control chip is used to output a pulse width modulation signal to the LED lamp group, so as to control the working duration of the constant current circuit connected in series with the LED lamp group through the pulse width modulation signal.

[0010] Preferably, there are multiple LED lamp groups, and the multiple LED lamp groups are used to connect LED lamps of multiple colors; the multiple LED lamp groups correspond to multiple constant current circuits; the control chip is also used to control whether the constant current circuits corresponding to the LED lamp groups work or not, so as to turn on or off the corresponding LED lamp groups.

[0011] Preferably, the MCU controller further includes a wireless communication module. The control chip establishes a communication connection with an external device through the wireless communication module, and outputs a corresponding pulse width modulation signal according to the control signal sent by the external device.

[0012] Preferably, it further includes a power sampling module for displaying the remaining power of the battery.

[0013] Preferably, the operating voltage of the control chip is 5V.

[0014] A photographic lamp includes a photographic lamp and the photographic lamp power supply circuit as described above.

[0015] The beneficial effects of the present utility model are as follows: By setting the power supply circuit of the photographic lamp to be compatible with the power adapter power supply and the battery power supply, the photographic lamp is no longer restricted by the power supply scenario of the power adapter power supply, and the battery can be directly charged in the circuit without additionally setting a battery charger for the battery. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the photographic lamp power supply circuit provided for this new implementation.

[0017] Figure 2 It is a schematic diagram of the power conversion circuit provided for this new implementation.

[0018] Figure 3 It is a schematic diagram of the constant current circuit provided for this new implementation.

[0019] Figure 4 It is a schematic diagram of the MCU controller provided for the present utility model.

[0020] Figure 5 It is a schematic diagram of the power consumption module provided for the present utility model.

[0021] Figure 6 It is a schematic diagram of the wireless communication module provided for the present utility model. Detailed Embodiments

[0022] In order to make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be described in detail below with reference to the drawings and specific embodiments.

[0023] Here, it should also be noted that in order to avoid obscuring the present utility model due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present utility model are shown in the drawings, while other details less related to the present utility model are omitted.

[0024] In addition, it should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0025] Embodiment:

[0026] As shown in Figure 1-6 Figure , a power supply circuit for a photographic lamp includes: a DC power supply 10, a power conversion circuit 30, an MCU controller 40, a constant current circuit 50, an LED module 60 connected in series in sequence, and a battery 70 and a battery charging management circuit 20 connected in series between the DC power supply 10 and the power conversion circuit 30;

[0027] The battery 70 is a rechargeable battery that can be charged and discharged repeatedly;

[0028] The battery charging management circuit 20 is used to control the charging duration and charging voltage of the battery 70, and can charge the battery 70 when the DC power supply 10 is input;

[0029] The power conversion circuit 30 is used to switch the power supply to the battery 70 when the DC power supply 10 is disconnected, or switch to the DC power supply 10 when the DC power supply 10 is connected while originally in the battery 70 power supply state. If it is convenient to use the power adapter power in the current scenario, then connect the power adapter power to provide a stable power supply for the power circuit; if it is not convenient to use the power adapter power in the current scenario, then connect the battery power, which can make the power supply circuit of the photographic lamp not restricted by the power supply scenario (such as no need for an AC power socket), making it convenient for both the power supply of the photographic lamp and the movement of the photographic lamp (such as the battery can be hung on the bracket and move with the photographic lamp, and can be moved arbitrarily in indoor and outdoor scenarios).

[0030] The MCU controller 40 is used to control the working duration of the constant current circuit 50 to adjust the output power of the LED module 60.

[0031] In this embodiment, the MCU controller 40 includes a conversion circuit and a control chip. The conversion circuit is used to convert the input voltage into the working voltage of the control chip, and the control chip is used to output a pulse width modulation signal to the LED lamp group 60 to control the working duration of the constant current circuit 50 connected in series with the LED lamp group 60 through the pulse width modulation signal.

[0032] It should be noted that the constant current circuit 50, also known as the constant current source circuit, consists of a signal source and a voltage controlled current source (VCCS). The sine signal source adopts the direct digital frequency synthesis technology, that is, continuously reads sine sampling data from the EPROM (Erasable Programmable Read-Only Memory) at a certain frequency, and generates the required sine signal after D / A conversion and filtering; by setting the corresponding registers under the control of the single-chip microcomputer, the output of any frequency and phase can be easily obtained. Therefore, the constant current circuit 50 can adopt the existing constant current source circuit (such as the circuit mainly composed of the H5119L constant current driving chip), as long as it can realize the corresponding control functions required by this embodiment.

[0033] In this embodiment, there are multiple LED lamp groups 60, and the multiple LED lamp groups 60 are used to connect LED lamps of multiple colors; the multiple LED lamp groups 60 correspond to multiple constant current circuits 50; the control chip is further used to control whether the constant current circuit 50 corresponding to the LED lamp group 60 works or not, so that the corresponding LED lamp group 60 is powered on or off, realizing the operation of the photographic lamp with different lamp colors switched.

[0034] In this embodiment, the MCU controller 40 further includes a wireless communication module. The control chip establishes a communication connection with an external device through the wireless communication module, and outputs a corresponding pulse width modulation signal according to the control signal sent by the external device.

[0035] The above wireless communication module is connected to the communication end of the control chip. Among them, the wireless communication module can be a WiFi communication module or a Bluetooth communication module. After the control chip establishes a communication connection with the external device through the wireless communication module, it can receive the control signal sent by the external device through the wireless communication module. In this way, when the user wants to adjust the brightness of the photographic lamp or switch the lamp color of the photographic lamp, the corresponding control signal can be sent to the control chip through the application of the external device.

[0036] In this embodiment, a power sampling module is further included. The power sampling module is used to display the remaining power of the battery, which is convenient for the user to switch the power supply in time.

[0037] In this embodiment, the working voltage of the control chip is 5V.

[0038] The present utility model further provides a photographic lamp, which includes a photographic lamp and a power supply circuit of the photographic lamp. The specific structure of the power supply circuit of the photographic lamp refers to the above embodiment. Since this photographic lamp adopts all the technical solutions of the above all embodiments, it at least has all the technical effects brought by the technical solutions of the above embodiments, and will not be elaborated one by one here. Among them, the photographic lamp is electrically connected to the photographic lamp power supply end in the power supply circuit.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A power supply circuit for a photographic lamp, characterized in that, Comprising: A DC power supply, a power conversion circuit, an MCU controller, a constant current circuit, an LED lamp group connected in series in sequence, and a battery and a battery charging management circuit connected in series between the DC power supply and the power conversion circuit; The battery is a rechargeable battery that can be charged and discharged repeatedly; The battery charging management circuit is used to control the charging duration and charging voltage of the battery; The power conversion circuit is used to switch the power supply to battery power supply when the DC power supply is disconnected; The MCU controller is used to control the working duration of the constant current circuit, so as to adjust the output power of the LED lamp group.

2. The power supply circuit of a photographic lamp according to claim 1, characterized in that, The MCU controller includes a conversion circuit and a control chip. The conversion circuit is used to convert the input voltage into the working voltage of the control chip, and the control chip is used to output a pulse width modulation signal to the LED lamp group, so as to control the working duration of the constant current circuit connected in series with the LED lamp group through the pulse width modulation signal.

3. The power supply circuit of a photographic lamp according to claim 2, wherein, There are multiple LED lamp groups. The multiple LED lamp groups are used to connect LED lamps of multiple colors; the multiple LED lamp groups correspond to multiple constant current circuits; the control chip is also used to control whether the constant current circuits corresponding to the LED lamp groups work or not, so that the corresponding LED lamp groups are powered on or off.

4. The power supply circuit of a photographic lamp according to claim 2, characterized in that, The MCU controller further includes a wireless communication module. The control chip establishes a communication connection with an external device through the wireless communication module, and outputs a corresponding pulse width modulation signal according to the control signal sent by the external device.

5. The power supply circuit of a photographic lamp according to claim 1, characterized in that, It further includes a power sampling module, and the power sampling module is used to display the remaining power of the battery.

6. The power supply circuit of a photographic lamp according to claim 4, wherein The working voltage of the control chip is 5V.

7. A photographic lamp, characterized in that, Comprising a photographic lamp and a photographic lamp power supply circuit according to any one of claims 1-6.

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