CN209170238U - A kind of LED display power supply unit and system - Google Patents

Abstract

The utility model relates to a power supply device and system for an LED display screen. The device comprises a main machine and at least one auxiliary machine. The input end of the main machine is electrically connected with an external commercial power; the auxiliary machine comprises a transformer, a magnetic amplifier, a synchronous rectification circuit and an LC filter. , the two ends of the primary coil of the transformer are used as input terminals to be electrically connected to the output terminal of the host, one of the secondary coils of the transformer is electrically connected to the input terminal of the magnetic amplifier, the magnetic amplifier, the synchronous rectification circuit and the LC filter circuit are connected in series, and the LC The filter circuit is electrically connected with the LED display module, and the other secondary coil of the transformer is electrically connected with the synchronous rectification circuit. The power supply device of the utility model converts the AC mains voltage into a high-frequency square wave through a transformer, and supplies power to a magnetic amplifier in one way. There is no need to set up a rectifier driver chip separately, the circuit structure is simple, the reliability is high, the construction difficulty is low, and the maintenance is convenient.

Description

A LED display power supply device and system

technical field

The utility model relates to the technical field of electronic circuits, in particular to a power supply device and a system for an LED display screen.

Background technique

The existing LED display power supply system uses the AC 220V input voltage through the AC/DC converter, and the power of each AC/DC converter is about 200W; the converter converts the AC into 5V DC, and then converts the 5V DC voltage. Connect to the display module through a 2.5m㎡ cable. As shown in Figure 1, the power supply provides the power frequency 220V AC voltage; the AC/DC converter converts the AC 220V into an isolated 5V DC voltage; the standard part of the LED display module, the size of the display screen is different, and the AC/DC The parallel connection of the converters is extended, from 1 to n. However, this power system has the following shortcomings:

1. The power converter needs to be installed close to the frame, the construction is difficult, the wiring is complicated, and the number of wires used is large;

2. The efficiency of a single converter is generally 0.8. When multiple are installed in parallel, the overall power supply efficiency of the system is much lower than 0.8, and it is necessary to specially configure air conditioning for heat dissipation;

3. The system redundancy is not high, there is no parallel connection, the power failure rate in use is high, and the reliability is poor;

4. The large LED screen is generally installed at a high place, and the cost of replacement and maintenance of the power module is quite high.

Utility model content

The technical problem to be solved by the present invention is to provide a power supply device and system for an LED display screen aiming at the above-mentioned deficiencies of the prior art.

The technical solution of the present invention to solve the above technical problems is as follows: a power supply device for an LED display screen, comprising a main machine and at least one auxiliary machine, the input end of the main machine is electrically connected to an external mains; the auxiliary machine comprises a transformer T, a magnetic Amplifier, synchronous rectification circuit and LC filter, both ends of the primary coil of the transformer T are used as input ends to be electrically connected to the output end of the host, and two ends of one of the secondary coils of the transformer T are used as a set of outputs The terminal is electrically connected to the input terminal of the magnetic amplifier, the output terminal of the magnetic amplifier is electrically connected to an input terminal of the synchronous rectification circuit, and the output terminal of the synchronous rectification circuit is electrically connected to the input terminal of the LC filter circuit. connection, the output end of the LC filter circuit is electrically connected to the power input end of the LED display module, and the two ends of the other secondary coil of the transformer T serve as another group of output ends and another input end of the synchronous rectifier circuit. terminal electrical connection.

The beneficial effects of the utility model are as follows: the AC mains voltage is converted into a high-frequency square wave through a transformer, and one channel supplies power to the magnetic amplifier. The magnetic amplifier adjusts the duty ratio through the magnetic saturation region to realize voltage stabilization, and the other channel directly drives the synchronous rectification. The circuit uses the synchronous rectification circuit to rectify the high-frequency square wave processed by the magnetic amplifier, and then uses the LC filter for filtering and smoothing to output 5V DC voltage and supply power to the LED display. The structure is simple, the cost is low, the reliability of the circuit is high, the construction difficulty is low, and the maintenance is convenient.

On the basis of above-mentioned technical scheme, the present invention can also do following improvement:

Further: the number of the auxiliary machines is multiple, and the LED display module includes the same number of LED display screens as the auxiliary machines, and the output end of the LC filter circuit of the auxiliary machine corresponds to the LED display screen. The power input terminal is electrically connected.

The beneficial effect of the above-mentioned further solution is that the LED display module can be expanded through a plurality of auxiliary machines to supply power to the corresponding LED display screen, so as to meet the needs of display screens of different sizes and specifications.

The utility model also provides a power supply system for the LED display screen, which comprises a plurality of the power supply devices for the LED display screen.

Description of drawings

1 is a schematic structural diagram of a display screen power supply device in the prior art;

2 is a schematic structural diagram of a power supply device for an LED display screen of the present invention;

FIG. 3 is a schematic diagram of the circuit structure of the auxiliary engine of the present invention.

In the accompanying drawings, the list of components represented by each number is as follows:

1. Main unit, 2. Auxiliary unit, 3. LED display module, 4. LED display.

Detailed ways

The principles and features of the present invention will be described below with reference to the accompanying drawings, and the examples are only used to explain the present invention, and are not intended to limit the scope of the present invention.

As shown in FIG. 2 , a power supply device for an LED display screen includes a main unit 1 and at least one auxiliary unit 2 , and an input end of the main unit 1 is electrically connected to an external commercial power.

As shown in FIG. 3 , the auxiliary machine 2 includes a transformer T, a magnetic amplifier, a synchronous rectification circuit and an LC filter. Both ends of the primary coil of the transformer T are used as input ends to be electrically connected to the output end of the host 1 . Two ends of one of the secondary coils of the transformer T are electrically connected to the input end of the magnetic amplifier as a set of output ends, and the output end of the magnetic amplifier is electrically connected to an input end of the synchronous rectification circuit, so the The output end of the synchronous rectification circuit is electrically connected to the input end of the LC filter circuit, the output end of the LC filter circuit is electrically connected to the power supply input end of the LED display module 3, and the other secondary coil of the transformer T is electrically connected. The two ends are electrically connected to another input end of the synchronous rectification circuit as another group of output ends.

The power supply device for the LED display screen of the utility model converts the AC mains voltage into a high-frequency square wave through a transformer, and supplies power to a magnetic amplifier in one way. The synchronous rectification circuit rectifies the high-frequency square wave processed by the magnetic amplifier through the synchronous rectification circuit, and then performs filtering and smoothing processing by the LC filter, and outputs 5V DC voltage and supplies power to the LED display screen. There is no need to set up a separate rectifier driver chip. , The circuit structure is simple, the cost is low, the reliability of the circuit is high, the construction difficulty is low, and the maintenance is convenient.

In the embodiment provided by the present invention, the number of the auxiliary machine 2 is multiple, and the LED display module 3 includes the same number of LED display screens 4 as the auxiliary machine 2, and the LC filter of the auxiliary machine 2 The output end of the circuit is electrically connected with the corresponding power input end of the LED display screen 4 . By supplying power to the corresponding LED display screen 4 through a plurality of sub-machines 2, any expansion of the LED display module 3 can be realized to meet the needs of display screens of different sizes and specifications.

In the embodiment provided by the utility model, the power of the main engine 1 is 1KW, the efficiency is 98%, the input AC voltage is 220V, and the high-frequency square wave is output, which can greatly facilitate the magnetic amplifier and the synchronous rectification circuit of the subsequent auxiliary machine 2. A separate synchronous rectification driver chip is omitted, the circuit is safe and simple, the current is large, the cost is reduced, and the reliability is increased.

The power of the auxiliary machine 2 is 20-40W, and a high-frequency square wave is input. The magnetic amplifier adjusts the duty cycle of the high-frequency square wave through the size of the magnetic saturation region to achieve the purpose of voltage regulation, and another high-frequency square wave directly drives the synchronous rectifier. The synchronous rectification circuit rectifies the high-frequency square wave, and then performs filtering and smoothing processing by the LC filter, and finally outputs a 5V DC voltage and supplies power to the LED display screen 4 .

In practice, according to the different requirements of the size of the LED screen, it can be satisfied by parallel expansion of multiple sub-machines 2 . For the installation of outdoor large screens, the area power expansion is convenient. When installing, the auxiliary machine is attached to the frame of the LED screen module at a high place, which saves the wiring, beautiful wiring, and no maintenance.

In the utility model, the magnetic amplifier adopts the saturable inductance of the closed magnetic circuit magnetic core with high magnetic permeability, which is equivalent to a switch, and the magnetic switch is turned on when saturated, and turned off when not saturated. The synchronous rectification circuit adopts MOS tube, which greatly reduces the loss of the traditional diode rectification, and removes the electrolytic capacitor. The circuit is efficient, reliable, and maintenance-free.

The LED screen power supply device of the utility model is composed of several passive components and devices working at low voltage to form the auxiliary machine 2, and the auxiliary machine 2 is installed together with the LED display screen 4, which has high reliability and low failure rate. 1 Can be installed separately and placed in a place where it is easy to maintain. Of course, the host 1 has high efficiency, low loss and low failure rate.

In addition, the LED screen power supply device of the present utility model reduces the difficulty in construction, reduces the number of wires, does not need a special heat sink, reduces the cost, and has considerable economic benefits. Also more convenient.

The utility model also provides a power supply system for the LED display screen, which comprises a plurality of the power supply devices for the LED display screen.

In practice, when the power of the host 1 exceeds 1KW, multiple hosts 1 can be expanded in parallel to meet the requirements of different LED screen sizes.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the utility model.

Claims (3)

1. A power supply device for an LED display screen, characterized in that: it comprises a main machine (1) and at least one auxiliary machine (2), and an input end of the main machine (1) is electrically connected to an external mains; The auxiliary machine (2) includes a transformer T, a magnetic amplifier, a synchronous rectification circuit and an LC filter, and both ends of the primary coil of the transformer T are used as input ends to be electrically connected to the output end of the host (1). Two ends of one of the secondary coils of the transformer T are electrically connected to the input end of the magnetic amplifier as a set of output ends, and the output end of the magnetic amplifier is electrically connected to an input end of the synchronous rectifier circuit, and the synchronous rectifier circuit The output end of the rectifier circuit is electrically connected to the input end of the LC filter circuit, the output end of the LC filter circuit is electrically connected to the power supply input end of the LED display module (3), and the other secondary coil of the transformer T has an electrical connection. The two ends are electrically connected to another input end of the synchronous rectification circuit as another group of output ends. 2 . The power supply device for an LED display screen according to claim 1 , wherein the number of the auxiliary machines ( 2 ) is plural, and the LED display module ( 3 ) includes and the auxiliary machine ( 2 ). 3 . For the same number of LED display screens (4), the output end of the LC filter circuit of the auxiliary machine (2) is electrically connected to the corresponding power supply input end of the LED display screen (4). 3. A power supply system for an LED display screen, characterized in that it comprises a plurality of power supply devices for the LED display screen according to claim 1 or 2.