Slow gate flash triggering control circuit and control method

Abstract

The invention discloses a slow gate flash triggering control circuit and a control method, and belongs to the field of flash triggering devices. The slow gate flash triggering control circuit comprises a main control module, a display module, a key module, a PD fast charging module and a photographing triggering charging module, the display module and the key module are electrically connected with the main control module, and the PD fast charging module is electrically connected with the main control module through the photographing triggering charging module. Compared with the prior art, when the flash trigger is used and a trigger signal given by a camera is received, the key module can set flash parameters such as flash times and flash frequency of the flash lamp through the main control module, and the flash lamp flashes for many times within the exposure time of the camera, so that slow-door shooting is realized; meanwhile, during photographing, power can be supplied to the flash trigger and a camera battery and an external power supply can be provided for the camera through the PD fast charging module, so that the problem that the working time of the camera battery is insufficient is solved, the flash trigger can be independently used, and a user can use the flash trigger more conveniently.

Description

Technical Field

[0001] The invention belongs to the technical field of flash triggers, and in particular relates to a slow-door flash triggering control circuit and a control method. Background Art

[0002] Flash triggers are auxiliary equipment in photographic equipment, and are generally used in studios with various flash lamps. Flash triggers are installed on cameras and control flash lamps through optical, wired or wireless means, so that the flash time of the flash lamps and the shutter of the camera can work synchronously. During the shooting process, in order to achieve good photographic effects, most professional cameras are equipped with external flash lamps, which are connected to the flash triggers by radio, optical cable, infrared or direct circuit connection. When taking pictures, when the operator presses the camera shutter, the camera transmits the trigger signal to the flash trigger through the output electrode, and the flash trigger sends instructions through the control circuit to activate the connected flash lamp, so that the flash lamp and the camera shutter work synchronously.

[0003] When the existing flash trigger is used, it generally needs to be equipped with an independent external battery for power supply. The flash trigger cannot be used independently, which easily brings inconvenience to the user.

[0004] In order to solve this problem, the patent with publication number CN220473834U discloses a flash trigger with a charging effect. A battery is arranged inside the flash trigger, and the battery is electrically connected to the control circuit board. When the flash trigger is in use, the battery can power the flash trigger and the camera. There is no need to prepare a separate power supply, which is convenient for users to use and improves the user experience.

[0005] However, the flash trigger disclosed in the above patent only has the function of shutter triggering, and can only perform conventional shutter shooting, and cannot facilitate slow shutter shooting. Conventional shutter shooting has only one flash in one exposure process, and when shooting moving objects, it will form a smear, making the shooting effect poor. If you want to better shoot the whole process of the moving object, you usually need to take multiple shots and show the motion effect by superimposing multiple photos, which is inconvenient. Summary of the invention

[0006] In order to solve the above problems, the purpose of the present invention is to provide a slow-speed flash triggering control circuit and control method, which enable the flash trigger to have the function of slow-speed flash triggering, so as to facilitate the camera to realize slow-speed shooting.

[0007] To achieve the above object, the technical solution of the present invention is as follows:

[0008] The present invention provides a slow-door flash control circuit, comprising:

[0009] Main control module, used for signal control and processing;

[0010] Display module, used for displaying control parameters;

[0011] Button module, used to adjust control parameters;

[0012] PD fast charging module, used to power the flash trigger;

[0013] The photo-trigger charging module is used to control the PD fast charging module switch;

[0014] The display module and the button module are both electrically connected to the main control module, and the PD fast charging module is electrically connected to the main control module by triggering the charging module through taking photos.

[0015] Furthermore, the main control module includes a main control MCU, and the display module, button module, and photo trigger charging module are all electrically connected to the main control MCU.

[0016] Furthermore, the model of the main control MCU is STC8H1K28.

[0017] Furthermore, the main control module further includes a capacitor C3 and a capacitor C4. A common end formed by connecting the capacitor C3 and the capacitor C4 in parallel is connected to the main control MCU, and the other common end is grounded.

[0018] Furthermore, the main control module also includes a resistor R8, a voltage-stabilizing diode, and a capacitor C5. One end of the capacitor C5 and one end of the resistor R8 form a common end connected to the main control MCU, and the other end of the capacitor C5 is grounded; the other end of the resistor R8 is connected to one end of the voltage-stabilizing diode, and the end of the voltage-stabilizing diode away from the resistor R8 is grounded.

[0019] Furthermore, the display module includes an OLED 1, and the OLED 1 is connected to the main control MCU.

[0020] Furthermore, the display module also includes capacitor C6, capacitor C7, capacitor C14, capacitor C15, capacitor C16, and resistor R22, and the two ends of the capacitor C6 and capacitor C6 are respectively connected to different pins of OLED1 to form a closed loop; one end of the capacitor C15 and capacitor C16 forms a common end connected to OELD1, one end of the capacitor C14 and resistor R22 are respectively connected to OELD1, and the other ends of the capacitor C14, capacitor C15, capacitor C16, and resistor R22 form a common end and are grounded.

[0021] Furthermore, the button module includes a button K2, a button K3, and a button K4, and the button K2, the button K3, and the button K4 are respectively connected to different pins of the main control module.

[0022] Furthermore, the photo trigger charging module includes a button K1, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a transistor Q2, and a transistor Q3. One end of the button K1 is connected to the PD fast charging module, and the other end forms a common end with one end of the resistor R10 and is connected to the first pole of the transistor Q2; the other end of the resistor R10 and one end of the resistor R12 form a common end and are connected to the PD fast charging module; the second pole of the transistor Q2 forms a common end with one end of the resistor R9 and is connected to the resistor R13, and the third pole of the transistor Q2 forms a common end with the other end of the resistor R9 and is connected to the PD fast charging module; the end of the resistor R13 away from the transistor Q2 is connected in series with the transistor Q3 and the resistor R11 and is connected to the main control MCU.

[0023] Furthermore, the PD fast charging module includes a charging chip U2, the charging chip U2 is connected to the button K1, the charging chip U2 is connected to the common end formed by the resistor R10 and the resistor R12, and the charging chip U2 is connected to the common end formed by the transistor Q2 and the resistor R9.

[0024] Furthermore, the chip model of the charging chip U2 is IP2366.

[0025] Furthermore, the PD fast charging module also includes a resistor R19, a capacitor C9, a capacitor C10, and a capacitor C11. One end of the resistor R19, the capacitor C9, the capacitor C10, and the capacitor C11 form a common end with the external VBUS power supply line and are connected to the seventh and eighth pins of the charging chip U2.

[0026] Furthermore, the PD fast charging module also includes capacitor C17, resistor R24, resistor R26, capacitor C19, capacitor C25, capacitor C26, capacitor C33, capacitor C36, capacitor C38, capacitor C40, capacitor C41, capacitor C42, capacitor C43, and capacitor C44. The capacitors C19, capacitor C25, capacitor C26, capacitor C33, capacitor C36, capacitor C38, capacitor C40, capacitor C41, capacitor C42, capacitor C43, and capacitor C44 are connected in parallel to form a common end connected to the common end formed by resistor R24 ​​and capacitor C17, and resistor R24 ​​and resistor R26 are connected in series. One end of capacitor C17 and resistor R26 forms a common end and is connected to the tenth pin of the charging chip U2. One end of the resistor R24 ​​and resistor R26 forms a common end and is connected to the eleventh pin of the charging chip U2.

[0027] Furthermore, the PD fast charging module also includes transistor Q4, transistor Q7, capacitor C31, capacitor C34, resistor R27, inductor L1, capacitor C32, capacitor C35, resistor R28, transistor Q6, and transistor Q8. The first pole of the transistor Q4 is connected to the eleventh pin of the charging chip U2, and the second pole of the transistor Q4 is connected to the twelfth pin of the charging chip U2; the first pole of the transistor Q7 is grounded, and the second pole is connected to the fifteenth pin of the charging chip U2; the resistor R27, capacitor C34, and capacitor C31 are connected in series and connected to the thirteenth pin of the charging chip U2, and the third pole of the transistor Q4 and the third pole of the transistor Q7 are connected to the ground. , capacitor C31, capacitor C34, and one end of inductor L1 form a common end connected to the fourteenth pin of the charging chip U2; the first pole of the transistor Q6 is connected to the twentieth pin of the charging chip U2, and the second pole of the transistor Q6 is connected to the nineteenth pin of the charging chip U2; the first pole of the transistor Q8 is grounded, and the second pole is connected to the sixteenth pin of the charging chip U2; the resistor R28, capacitor C35, and capacitor C32 are connected in series and connected to the eighteenth pin of the charging chip U2, the third pole of the transistor Q6, the third pole of the transistor Q8, capacitor C32, capacitor C35, and one end of the inductor L1 form a common end connected to the seventeenth pin of the charging chip U2.

[0028] Furthermore, the PD fast charging module also includes capacitor C12, capacitor C13, capacitor C20, capacitor C21, capacitor C22, capacitor C23, capacitor C24, capacitor C18, resistor R23, and resistor R25. The capacitor C12, capacitor C13, capacitor C20, capacitor C21, capacitor C22, capacitor C23, and capacitor C24 are connected in parallel to form a common end connected to the common end formed by capacitor C18 and resistor R23. The resistor R23 and resistor R25 are connected in series to form a common end formed by capacitor C18 and connected to the 21st pin of the charging chip U2, and the common end formed by the resistor R23 and resistor R25 is connected to the 20th pin of the charging chip U2.

[0029] Furthermore, the slow shutter flash triggering control circuit also includes a flash trigger state indication module, which includes a resistor R2, a resistor R3, and an LED3; the resistors R2 and R3 are connected in parallel to form two common ends, one of which is connected to the main control MCU, and the other common end is connected to the LED3, and one end of the LED3 away from the resistors R2 and R3 is connected to the main control MCU. The flash trigger state indication module indicates the working state of the flash trigger power by setting the LED3.

[0030] Furthermore, the slow shutter flash triggering control circuit also includes a flash trigger light signal transmitting module, which includes a resistor R1, an LED1, a resistor R4, an LED2, a transistor Q1, a resistor R5, and a resistor R6. The resistor R1 and LED1 are connected in series, and the resistor R4 and LED2 are connected in series. A common end formed by the resistor R1 and the resistor R4 is connected to the main control MUC, and a common end formed by the LED1 and the LED2 is connected to the first pole of the transistor Q1; the second pole of the transistor Q1 is grounded; the resistor R5 and the resistor R6 form a common end connected to the third pole of the transistor Q1; the other end of the resistor R6 is grounded, and the other end of the resistor R5 is connected to the main control MCU.

[0031] The present invention also provides a slow-door flash control method, comprising the following steps:

[0032] S1: Turn on the flash trigger;

[0033] S2: Use button K2 to select the slow shutter flashing mode;

[0034] S3: the working modes in step S2 include slow shutter mode, flash trigger module, and test mode. If the working mode selected in step S2 is the slow shutter mode, then the process proceeds to step S4; if the working mode selected in step S2 is the flash trigger mode or the test mode, then the process proceeds directly to step S6;

[0035] S4: Use button K3 to set the flash times of the flash trigger LED;

[0036] S5: Use button K4 to set the flash frequency of the flash trigger LED;

[0037] S6: The PWM pin of the main control MCU outputs a pulse signal.

[0038] Furthermore, in step S4, the number of flashes of the flash trigger LED corresponds to the number of PWM pulse signals output by the main control MCU within the exposure time. When the main control MCU outputs a PWM pulse signal, the flash light will flash once. The main control MCU can control the number of flashes of the flash light within the exposure time by the number of PWM pulse signals output.

[0039] Furthermore, in step S5, the flash frequency of the flash trigger LED corresponds to the interval time between the PWM pulse signals output by the main control MCU during the exposure time. The main control MCU outputs a PWM pulse signal, and the flash light flashes once. The main control MCU can control the flash frequency of the flash light during the exposure time through the interval time of the PWM pulse signal.

[0040] Furthermore, in steps S4 and S5, in the slow shutter mode, after the flash trigger receives a trigger signal from a camera, the MCU sends a PWM pulse signal with a pulse time of 3 ms, a pulse signal interval time adjustable between 10-200 ms, and a pulse signal number adjustable between 1-20.

[0041] Furthermore, the test mode is used to test whether the flash trigger LED can flash normally, that is, press the button on the flash trigger, the MCU sends a PWM pulse with a pulse duration of 3ms, triggering the flash trigger LED to flash once.

[0042] Furthermore, the flash trigger mode is a common flash trigger mode. After the flash trigger receives a trigger signal from a camera, the MCU sends a PWM pulse signal with a pulse time of 3ms.

[0043] Furthermore, in step S1, after the flash trigger is turned on, the PD fast charging module of the flash trigger will perform a power detection and indicate the power level through the LED.

[0044] The beneficial effects of the present invention are as follows:

[0045] Firstly, when the flash trigger of the present invention is in use, upon receiving a trigger signal from the camera, the button module can set the flash parameters such as the number of flashes and the flash frequency of the flash through the main control module. Within the camera exposure time, the flash flashes multiple times to achieve slow shutter speed shooting, leaving multiple images in one photo. When shooting a moving object, the entire process of the movement can be recorded, and the shooting effect is better.

[0046] Secondly, when taking pictures, the PD fast charging module can also be used to power the flash trigger and camera battery, providing an external power source for the camera, thereby making up for the problem of insufficient working time of the camera's own battery. It also allows the flash trigger to be used independently, making it more convenient for users to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a module block diagram of the slow shutter flash control circuit of this embodiment.

[0048] Figure 2 4 is a circuit schematic diagram of the main control module of this embodiment.

[0049] Figure 3 4 is a circuit diagram of the display module of this embodiment.

[0050] Figure 4 4 is a circuit diagram of the key module of this embodiment.

[0051] Figure 5 This is a circuit diagram of the PD fast charging module of this embodiment.

[0052] Figure 6 4 is a circuit diagram of the camera-triggering charging module of this embodiment.

[0053] Figure 7 4 is a circuit schematic diagram of the flash trigger status indication module of this embodiment.

[0054] Figure 8 This is the circuit schematic diagram of the flash trigger optical signal transmitting module.

[0055] Fig. 9 It is a circuit schematic diagram of some auxiliary modules of the slow shutter flash control circuit of this embodiment.

[0056] Fig.10 It is a control flow chart of the slow shutter flash control method of this embodiment. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0058] To achieve the above object, the technical solution of the present invention is as follows:

[0059] See also Figure 1-10 As shown, this embodiment provides a slow-speed flash control circuit, including:

[0060] Main control module, used for signal control and processing;

[0061] Display module, used for displaying control parameters;

[0062] Button module, used to adjust control parameters;

[0063] PD fast charging module, used to power the flash trigger;

[0064] The photo-trigger charging module is used to control the PD fast charging module switch;

[0065] The display module and the button module are both electrically connected to the main control module, and the PD fast charging module is electrically connected to the main control module by triggering the charging module through taking photos.

[0066] In the present application, when the operator presses the camera shutter, the main control module of the flash trigger receives the trigger signal from the camera and controls the photo trigger charging module to send a trigger signal to the PD fast charging module, thereby controlling the PD fast charging module to start up and supply power to the flash trigger and the camera. When the flash trigger is in use and receives a trigger signal from the camera, the button module can set the flash parameters such as the number of flashes and the flash frequency through the main control module. Within the camera exposure time, the flash flashes multiple times to achieve slow shutter speed shooting, leaving multiple images in one photo. When shooting moving objects, the entire process of the movement can be recorded, and the shooting effect is better. The display module can display the current flash parameters, making it convenient for the photographer to adjust the flash parameters.

[0067] Furthermore, the main control module includes a main control MCU, and the display module, the button module, and the photo trigger charging module are all electrically connected to the main control MCU.

[0068] Furthermore, the model of the main control MCU is STC8H1K28. It should be noted that in this application, the main control MCU is a prior art, which can adjust the flash parameters such as the number of flashes and the flash frequency according to the trigger signal transmitted by the camera by modifying the internal program of the chip, such as changing the number of flashes of the flash lamp from one to multiple times after receiving a trigger signal.

[0069] Furthermore, the main control module also includes a capacitor C3 and a capacitor C4. A common terminal formed by connecting the capacitor C3 and the capacitor C4 in parallel is connected to the main control MCU, and the other common terminal is grounded.

[0070] Furthermore, the main control module also includes a resistor R8, a Zener diode, and a capacitor C5. One end of the capacitor C5 and one end of the resistor R8 form a common end connected to the main control MCU, and the other end of the capacitor C5 is grounded; the other end of the resistor R8 is connected to one end of the Zener diode, and the end of the Zener diode away from the resistor R8 is grounded.

[0071] Furthermore, the display module includes an OLED1, and the OLED1 is connected to a main control MCU.

[0072] Furthermore, the display module also includes capacitor C6, capacitor C7, capacitor C14, capacitor C15, capacitor C16, and resistor R22. The two ends of capacitor C6 and capacitor C6 are respectively connected to different pins of OLED1 to form a closed loop; one end of capacitor C15 and capacitor C16 forms a common end connected to OELD1, one end of capacitor C14 and resistor R22 are respectively connected to OELD1, and the other ends of capacitor C14, capacitor C15, capacitor C16, and resistor R22 form a common end and are grounded.

[0073] Furthermore, the key module includes a key K2, a key K3, and a key K4, which are connected to different pins of the main control module respectively. Among them, the key K2 is used to select the working module, and the key K3 and the key K4 are used to set the number of flashes and the flash frequency respectively.

[0074] Furthermore, the photo trigger charging module includes a button K1, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a transistor Q2, and a transistor Q3. One end of the button K1 is connected to the PD fast charging module, and the other end forms a common end with one end of the resistor R10 and is connected to the first pole of the transistor Q2; the other end of the resistor R10 and one end of the resistor R12 form a common end and are connected to the PD fast charging module; the second pole of the transistor Q2 forms a common end with one end of the resistor R9 and is then connected to the resistor R13, and the third pole of the transistor Q2 forms a common end with the other end of the resistor R9 and is then connected to the PD fast charging module; the end of the resistor R13 away from the transistor Q2 is connected in series with the transistor Q3 and the resistor R11 and is then connected to the main control MCU.

[0075] Furthermore, the PD fast charging module includes a charging chip U2, which is connected to the button K1, connected to the common end formed by the resistor R10 and the resistor R12, and connected to the common end formed by the transistor Q2 and the resistor R9.

[0076] Furthermore, the chip model of the charging chip U2 is IP2366.

[0077] Furthermore, the PD fast charging module also includes a resistor R19, a capacitor C9, a capacitor C10, and a capacitor C11. One end of the resistor R19, the capacitor C9, the capacitor C10, and the capacitor C11 form a common end with the external VBUS power supply line and are connected to the seventh and eighth pins of the charging chip U2 for filtering.

[0078] Furthermore, the PD fast charging module also includes capacitor C17, resistor R24, resistor R26, capacitor C19, capacitor C25, capacitor C26, capacitor C33, capacitor C36, capacitor C38, capacitor C40, capacitor C41, capacitor C42, capacitor C43, and capacitor C44. Capacitor C19, capacitor C25, capacitor C26, capacitor C33, capacitor C36, capacitor C38, capacitor C40, capacitor C41, capacitor C42, capacitor C43, and capacitor C44 are connected in parallel to form a common end connected to the common end formed by resistor R24 ​​and capacitor C17, resistor R24 ​​and resistor R26 are connected in series, one end of capacitor C17 and resistor R26 forms a common end and is connected to the tenth pin of the charging chip U2, and one end of resistor R24 ​​and resistor R26 forms a common end and is connected to the eleventh pin of the charging chip U2.

[0079] Furthermore, the PD fast charging module also includes transistor Q4, transistor Q7, capacitor C31, capacitor C34, resistor R27, inductor L1, capacitor C32, capacitor C35, resistor R28, transistor Q6, and transistor Q8. The first pole of the transistor Q4 is connected to the eleventh pin of the charging chip U2, and the second pole of the transistor Q4 is connected to the twelfth pin of the charging chip U2; the first pole of the transistor Q7 is grounded, and the second pole is connected to the fifteenth pin of the charging chip U2; the resistor R27, the capacitor C34, and the capacitor C31 are connected in series and connected to the thirteenth pin of the charging chip U2, and the third pole of the transistor Q4, the third pole of the transistor Q7, One end of capacitor C31, capacitor C34, and inductor L1 form a common end connected to the fourteenth pin of the charging chip U2; the first pole of transistor Q6 is connected to the twentieth pin of the charging chip U2, and the second pole of transistor Q6 is connected to the nineteenth pin of the charging chip U2; the first pole of transistor Q8 is grounded, and the second pole is connected to the sixteenth pin of the charging chip U2; resistor R28, capacitor C35, and capacitor C32 are connected in series and connected to the eighteenth pin of the charging chip U2, the third pole of transistor Q6, the third pole of transistor Q8, capacitor C32, capacitor C35, and one end of inductor L1 form a common end connected to the seventeenth pin of the charging chip U2.

[0080] Furthermore, the PD fast charging module also includes capacitor C12, capacitor C13, capacitor C20, capacitor C21, capacitor C22, capacitor C23, capacitor C24, capacitor C18, resistor R23, and resistor R25. Capacitor C12, capacitor C13, capacitor C20, capacitor C21, capacitor C22, capacitor C23, and capacitor C24 are connected in parallel to form a common end connected to the common end formed by capacitor C18 and resistor R23. Resistor R23 and resistor R25 are connected in series to form a common end formed by capacitor C18 and connected to the 21st pin of the charging chip U2, and a common end formed by resistor R23 and resistor R25 is connected to the 20th pin of the charging chip U2.

[0081] Furthermore, the slow shutter flash triggering control circuit also includes a flash trigger state indication module, which includes a resistor R2, a resistor R3, and an LED3; the resistors R2 and R3 are connected in parallel to form two common ends, one of which is connected to the main control MCU, and the other common end is connected to the LED3, and one end of the LED3 away from the resistors R2 and R3 is connected to the main control MCU. The flash trigger state indication module indicates the working state of the flash trigger power by setting the LED3.

[0082] Furthermore, the slow shutter flash control circuit also includes a flash trigger light signal transmitting module, which includes a resistor R1, LED1, a resistor R4, LED2, a transistor Q1, a resistor R5, and a resistor R6. The resistor R1 and LED1 are connected in series, and the resistor R4 and LED2 are connected in series. A common end formed by the resistor R1 and the resistor R4 is connected to the main control MUC, and a common end formed by LED1 and LED2 is connected to the first pole of the transistor Q1; the second pole of the transistor Q1 is grounded; the resistor R5 and the resistor R6 form a common end connected to the third pole of the transistor Q1; the other end of the resistor R6 is grounded, and the other end of the resistor R5 is connected to the main control MCU.

[0083] This embodiment also provides a slow-speed flash triggering control method, comprising the following steps:

[0084] S1: Turn on the flash trigger;

[0085] S2: Use button K2 to select the slow shutter flashing mode;

[0086] S3: the working modes in step S2 include slow shutter mode, flash trigger module, and test mode. If the working mode selected in step S2 is the slow shutter mode, then the process proceeds to step S4; if the working mode selected in step S2 is the flash trigger mode or the test mode, then the process proceeds directly to step S6;

[0087] S4: Use button K3 to set the flash times of the flash trigger LED;

[0088] S5: Use button K4 to set the flash frequency of the flash trigger LED;

[0089] S6: The PWM pin of the main control MCU outputs a pulse signal.

[0090] Furthermore, in step S4, the number of flashes of the flash trigger LED corresponds to the number of PWM pulse signals output by the main control MCU within the exposure time. When the main control MCU outputs a PWM pulse signal, the flash light will flash once. The main control MCU can control the number of flashes of the flash light within the exposure time by the number of PWM pulse signals output.

[0091] Furthermore, in step S5, the flash frequency of the flash trigger LED corresponds to the interval time between the PWM pulse signals output by the main control MCU during the exposure time. The main control MCU outputs a PWM pulse signal, and the flash light flashes once. The main control MCU can control the flash frequency of the flash light during the exposure time through the interval time of the PWM pulse signal.

[0092] Furthermore, in steps S4 and S5, in the slow shutter mode, after the flash trigger receives a trigger signal from a camera, the MCU sends a PWM pulse signal with a pulse time of 3 ms, a pulse signal interval time adjustable between 10-200 ms, and a pulse signal number adjustable between 1-20.

[0093] Furthermore, the test mode is used to test whether the flash trigger LED can flash normally, that is: press the button on the flash trigger, the MCU sends a PWM pulse with a pulse duration of 3ms, triggering the flash trigger LED to flash once.

[0094] Furthermore, the flash trigger mode is a normal flash trigger mode. After the flash trigger receives a trigger signal from a camera, the MCU sends a PWM pulse signal with a pulse time of 3ms.

[0095] Furthermore, in step S1, after the flash trigger is turned on, the PD fast charging module of the flash trigger will perform a power detection and indicate the power level through the LED.

[0096] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A slow-door flash control circuit, characterized in that: include: Main control module, used for signal control and processing; Display module, used for displaying control parameters; Button module, used to adjust control parameters; The display module and the key module are both electrically connected to the main control module.

2. A slow-speed flash control circuit as claimed in claim 1, characterized in that: Also includes: PD fast charging module, used to power the flash trigger; The photo-trigger charging module is used to control the PD fast charging module switch; The PD fast charging module is electrically connected to the main control module by triggering the charging module through taking photos.

3. A slow-speed flash control circuit as claimed in claim 1, characterized in that: The main control module includes a main control MCU, and the display module, the button module, and the photo trigger charging module are all electrically connected to the main control MCU.

4. A slow-speed flash control circuit as claimed in claim 3, characterized in that: The model of the main control MCU is STC8H1K28.

5. A slow-speed flash control circuit as claimed in claim 3, characterized in that: The display module includes an OLED 1, and the OLED 1 is connected to the main control MCU.

6. A slow-speed flash control circuit as claimed in claim 3, characterized in that: The key module includes a key K2, a key K3, and a key K4, and the key K2, the key K3, and the key K4 are respectively connected to different pins of the main control module.

7. A slow-speed flash control circuit as claimed in claim 3, characterized in that: The camera trigger charging module includes a button K1, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a transistor Q2, and a transistor Q3. One end of the button K1 is connected to the PD fast charging module, and the other end forms a common end with one end of the resistor R10 to connect to the first pole of the transistor Q2; the other end of the resistor R10 and one end of the resistor R12 form a common end to connect to the PD fast charging module; the second pole of the transistor Q2 forms a common end with one end of the resistor R9 and then is connected to the resistor R13, and the third pole of the transistor Q2 forms a common end with the other end of the resistor R9 and then is connected to the PD fast charging module; the end of the resistor R13 away from the transistor Q2 is connected in series with the transistor Q3 and the resistor R11 and then connected to the main control MCU; The PD fast charging module includes a charging chip U2, which is connected to the button K1, connected to the common end formed by the resistor R10 and the resistor R12, and connected to the common end formed by the transistor Q2 and the resistor R9.

8. A slow-speed flash control circuit as claimed in claim 3, characterized in that: The slow-speed flash triggering control circuit also includes a flash triggering device status indication module, which includes a resistor R2, a resistor R3, and an LED3; the resistor R2 and the resistor R3 are connected in parallel to form two common ends, one of which is connected to the main control MCU, and the other common end is connected to the LED3, and the end of the LED3 away from the resistor R2 and the resistor R3 is connected to the main control MCU.

9. A slow-speed flash control circuit as claimed in claim 3, characterized in that: The slow shutter flash control circuit also includes a flash trigger light signal transmitting module, which includes a resistor R1, an LED1, a resistor R4, an LED2, a transistor Q1, a resistor R5, and a resistor R6. The resistor R1 and the LED1 are connected in series, and the resistor R4 and the LED2 are connected in series. A common end formed by the resistor R1 and the resistor R4 is connected to the main control MUC, and a common end formed by the LED1 and the LED2 is connected to the first pole of the transistor Q1; the second pole of the transistor Q1 is grounded; the resistor R5 and the resistor R6 form a common end connected to the third pole of the transistor Q1; the other end of the resistor R6 is grounded, and the other end of the resistor R5 is connected to the main control MCU.

10. A slow-speed flash triggering control method applied to the slow-speed flash triggering control circuit according to any one of claims 3 to 9, comprising the following steps: S1: Turn on the flash trigger; S2: Use button K2 to select the slow shutter flash mode; S3: the working modes in step S2 include slow shutter mode, flash trigger module, and test mode. If the working mode selected in step S2 is the slow shutter mode, then the process proceeds to step S4; if the working mode selected in step S2 is the flash trigger mode or the test mode, then the process proceeds directly to step S6; S4: Use button K3 to set the flash times of the flash trigger LED; S5: Use button K4 to set the flash frequency of the flash trigger LED; S6: The PWM pin of the main control MCU outputs a pulse signal.

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