Abstract: A control method and device of a voltage converter and a voltage control system are provided. In some embodiments, the control device includes a first control module configured to obtain a current reference value according to an output voltage of a voltage converter and a given voltage value; a current modulation module configured to reduce the current reference value when an output current of a voltage converter is greater than a first current threshold; and a second control module configured to control the output current of a voltage converter according to the reduced current reference value and an output current.

Abstract: The present invention provides a box latch. The box latch is provided with two wedge-shaped pins symmetrically arranged around its center, and the two wedge-shaped pins are movable into a wedge-shaped notch formed by mating parts of two spliced adjacent boxes and mating with the wedge-shaped pin to lock the two adjacent boxes. The two wedge-shaped pins are symmetrically arranged around its center such that only one box latch is required to lock two adjacent boxes together, reducing the number of splicing steps and box latches, further saving manpower and material resources. In addition, the wedge-shaped pin and the wedge-shaped notch are shaped and configured to mate with each other such that self-locking occurs when they are locked, thus providing a stable connection of the boxes.

Abstract: Provided is a lock, including a locking module and a driving module. The locking module includes a latch mounted on a first main body, an oblique pin ring gear mounted on a second main body and adapted to the latch. A radial thickness of the oblique pin ring gear changes continuously. A first slot is arranged on the latch. The driving module is used for driving the oblique pin ring gear to move in a circular motion, such that on the latch in a closed position the oblique pin ring gear clips to or separates from the first slot. The lock mechanism can realize inward or outward arcuate connection and planar connecting without finishing.

Abstract: Provided are an electric lock and a display screen using the same. The electric lock comprises a main lock and a secondary lock. The main lock comprises a housing, a driving assembly comprising a driving member and a rotating shaft which is rotatably arranged on the housing, and a first connecting member. The secondary lock comprises a first sleeve, an elastic member and a second connecting member which is rotatably arranged in the first sleeve. The second connecting member is able to move along the axis of the first sleeve. The driving member drives the first connecting member to move along its axis, and rotates the first connecting member when the first connecting member abuts against the second connecting member. The electric lock is simple in structure, convenient to operate and small in size.

Abstract: Provided is a lock, comprising a locking module and a driving module, wherein the locking module comprises a latch mounted on a first main body, a oblique pin ring gear mounted on a second main body and adapted to the latch; the radial thickness of the oblique pin ring gear changes continuously; a first slot is arranged on the latch, and wherein the driving module is used for driving the oblique pin ring gear to move in a circular motion, such that on the latch in a closed position the oblique pin ring gear clips to or separates from the first slot. The lock mechanism can realize inward or outward arcuate connection and planar connecting without finishing.

Abstract: The present invention provides a box latch. The box latch is provided with two wedge-shaped pins symmetrically arranged around its center, and the two wedge-shaped pins are movable into a wedge-shaped notch formed by mating parts of two spliced adjacent boxes and mating with the wedge-shaped pin to lock the two adjacent boxes. The two wedge-shaped pins are symmetrically arranged around its center such that only one box latch is required to lock two adjacent boxes together, reducing the number of splicing steps and box latches, further saving manpower and material resources. In addition, the wedge-shaped pin and the wedge-shaped notch are shaped and configured to mate with each other such that self-locking occurs when they are locked, thus providing a stable connection of the boxes.

Abstract: An LED display screen with protective devices is disclosed. Two adjacent display screen boxes are respectively provided with a first protective device and a second protective device which are retractable; first protective device and second protective device are correspondingly arranged; first protective device is linked with second protective device so that the two adjacent display screen boxes are spliced; and a portion of first protective device and second protective device respectively protrude from the display screen boxes when the two adjacent display screen boxes are not spliced. When the display screen boxes are not spliced, the protruding portions of protective devices may protect the sides of display screen boxes to prevent damage to the display screen boxes caused by collision, etc. Because the protective devices are retractable, they can retract without affecting the splicing between display screen boxes when the display screen boxes are spliced.

Abstract: The utility model discloses an ejection device, comprising a housing, an ejector, a rotor, a drive unit and guide units, wherein the housing is a hollow structure with an opening; the ejector is disposed in the housing; the drive unit drives the rotor to rotate; during rotating, the rotor drives the ejector to rotate along the circumference of the housing and drives the ejector to move toward the opening; guide slots are formed on the inner wall of the housing; the guide slots are disposed along the ejection direction of the ejector; and the guide units are disposed on the outer wall of the ejector and slidably disposed in the guide slots. The ejection device provided by the utility model is not only easily operated, but also simple in structure and small in size, does not require a large magnet, and can reduce the product weight.

Abstract: Provided are an electric lock and a display screen using the same. The electric lock comprises a main lock and a secondary lock. The main lock comprises a housing, a driving assembly comprising a driving member and a rotating shaft which is rotatably arranged on the housing, and a first connecting member. The secondary lock comprises a first sleeve, an elastic member and a second connecting member which is rotatably arranged in the first sleeve. The second connecting member is able to move along the axis of the first sleeve. The driving member drives the first connecting member to move along its axis, and rotates the first connecting member when the first connecting member abuts against the second connecting member. The electric lock is simple in structure, convenient to operate and small in size.

Abstract: An LED display screen with protective devices is disclosed. Two adjacent display screen boxes are respectively provided with a first protective device and a second protective device which are retractable; first protective device and second protective device are correspondingly arranged; first protective device is linked with second protective device so that the two adjacent display screen boxes are spliced; and a portion of first protective device and second protective device respectively protrude from the display screen boxes when the two adjacent display screen boxes are not spliced. When the display screen boxes are not spliced, the protruding portions of protective devices may protect the sides of display screen boxes to prevent damage to the display screen boxes caused by collision, etc. Because the protective devices are retractable, they can retract without affecting the splicing between display screen boxes when the display screen boxes are spliced.

Abstract: The utility model discloses an ejection device, comprising a housing, an ejector, a rotor, a drive unit and guide units, wherein the housing is a hollow structure with an opening; the ejector is disposed in the housing; the drive unit drives the rotor to rotate; during rotating, the rotor drives the ejector to rotate along the circumference of the housing and drives the ejector to move toward the opening; guide slots are formed on the inner wall of the housing; the guide slots are disposed along the ejection direction of the ejector; and the guide units are disposed on the outer wall of the ejector and slidably disposed in the guide slots. The ejection device provided by the utility model is not only easily operated, but also simple in structure and small in size, does not require a large magnet, and can reduce the product weight.

Abstract: A small-spacing LED screen is provided, comprising a bottom case, an HUB board arranged on one side of the bottom case, and a small module arranged on the other side and electrically connected with the HUB board. The small module includes a module main body and a drive control unit which is electrically connected with the module main body to drive and control the module main body. An adaptor plate is also arranged between the small module and the HUB board. The HUB board is electrically connected with the adaptor plate. The drive control unit is arranged on the adaptor plate. The LED screen has the smallest spacing, and the reject ratio of the small module is greatly reduced.

Abstract: A small-spacing LED screen is provided, comprising a bottom case, an HUB board arranged on one side of the bottom case, and a small module arranged on the other side and electrically connected with the HUB board. The small module includes a module main body and a drive control unit which is electrically connected with the module main body to drive and control the module main body. An adaptor plate is also arranged between the small module and the HUB board. The HUB board is electrically connected with the adaptor plate. The drive control unit is arranged on the adaptor plate. The LED screen has the smallest spacing, and the reject ratio of the small module is greatly reduced.

Abstract: An LED display mask and an LED display are provided. The LED display includes at least two first frame strips and at least two second frame strips which are orthogonal to each other and form a rectangular mesh body. The rectangular mesh body is fixed to a bottom case of an LED module and has at least two unclosed sides. The tail ends of the frame strips orthogonal to the unclosed sides exceed the outside frame strips parallel to the unclosed sides. The LED display mask and the LED display solve the problem that the existing adjacent masks on the LED display bulge at the junctions because of unmatched dimensions or thermal expansion, resulting in black shadows and dark areas on the display. With the present invention the excessive parts can be easily cut when adjacent masks extend mutually to form bulges without affecting the characteristics of the display.

Abstract: A locking connection device, an LED box and an LED display screen are provided. The device includes a locking module and an inserting module. The locking module includes a hook and a bump matching with each other. The inserting module includes a fixing pin and a fixing hole matching with each other. The fixing pin and hook are fixed on a first base, and the bump and the fixing hole are fixed on a second base. The locking connection device further includes a driving module that propels the hook and the fixing pin to move synchronously. When the driving module finishes a travel, the hook and the bump are securely connected, and the fixing pin and the fixing hole are securely connected. Since the locking module according to the present invention locks the movement of the first base and the second base along the axial direction of the fixing pin and meanwhile the inserting module locks a circumferential movement of the fixing pin, the first base and the second base are securely fixed.

Abstract: A locking connection device, an LED box and an LED display screen are provided. The device includes a locking module and an inserting module. The locking module includes a hook and a bump matching with each other. The inserting module includes a fixing pin and a fixing hole matching with each other. The fixing pin and hook are fixed on a first base, and the bump and the fixing hole are fixed on a second base. The locking connection device further includes a driving module that propels the hook and the fixing pin to move synchronously. When the driving module finishes a travel, the hook and the bump are securely connected, and the fixing pin and the fixing hole are securely connected. Since the locking module according to the present invention locks the movement of the first base and the second base along the axial direction of the fixing pin and meanwhile the inserting module locks a circumferential movement of the fixing pin, the first base and the second base are securely fixed.