CN101697455A - Power supply system and power supply method for LED electronic display screen - Google Patents

Abstract

The invention relates to a power supply system for an LED electronic display screen, which belongs to the technical field of power supply circuit devices. The power supply system for the LED electronic display screen comprises a power source and power switching circuit formed by serially connecting a high frequency transformer and a rectifier filter, wherein the power source outputs rectangular waveform high-frequency AC voltage serving as the output of the power supply system by using a low-voltage direct current method after voltage reduction by the high frequency transformer and rectification and filtration by the rectifier filter; and the power supply system of the LED electronic display screen has the characteristics of low power consumption, high stability, long service life and low cost. Moreover, the invention also provides a power supply method for supplying power to the LED electronic display screen by adopting the power supply system, which sets the voltage drop of a constant current drive control circuit of a display screen module LED lamp in a range as small as possible, so that the method not only greatly improves the efficiency of the power supply system and reduces the power consumption of the constant current drive control circuit, but also reduces the cost of the power supply source.

Description

A kind of LED electronic display electric power system and method for supplying power to

Technical field

The present invention relates to electric power system, be specifically related to the LED display electric power system, belong to the circuit arrangement for powering technical field.

Background technology

The LED electronic display is a kind of by light-emitting diode (Light-Emitting Diode, LED) as the electronic console of display terminal, it has the characteristics of digitlization, high brightness and is widely used in each field of information display, for example bank, post and telecommunications, the tax, airport, station, hospital, securities market and domestic television set in the future etc.In LED electronic display course of normal operation, its electric power system and method for supplying power to play crucial effects.

Fig. 1 is traditional LED electronic display electric power system schematic diagram, as shown in Figure 1, the power supply of tradition LED electronic display adopts Switching Power Supply directly to export, what Switching Power Supply was exported is low-voltage dc voltage, and what the LED display system used at present is generally+the 5V power supply, with regard to this situation, civil power is converted to+power supply of 5V output, its efficient is about 0.75, wants to obtain more high efficiency, and cost is very big.In addition, because high frequency transformer and rectifier filter are incorporated into Switching Power Supply inside, require different LED electronic display work modules for rated operational voltage, this electric power system is difficult to satisfy its job requirement.

Fig. 2 is traditional LED electronic display method of supplying power to connection diagram.As shown in Figure 2, because voltage is lower, electric current is bigger, and the power lead that is connected to the LED display module must be very thick, and the whole system power consumption efficiency is lower, so that can produce bigger heat.

Summary of the invention

The technical problem to be solved in the present invention is, reduces the power consumption of power supply and drive part in the LED display system, improves power supply stability, and adopts unified electric power system to satisfy to have the LED electronic display of different operating voltage request.

For solving the problems of the technologies described above, LED electronic display electric power system provided by the invention comprises power supply and power-switching circuit, this power-switching circuit comprises high frequency transformer and rectifier filter, power supply output be the high-frequency ac voltage of square waveform, behind high frequency transformer step-down and rectifier filter rectifying and wave-filtering with of the output of low-voltage direct method for electrically as electric power system.

In LED electronic display electric power system provided by the invention, the high-frequency ac output of power supply and civil power input isolated from power, and the effective voltage scope of institute's output AC voltage is 10V～200V, frequency range is 10KHz～1000KHz, and high frequency transformer has fixing turn ratio, according to the operating voltage demand of connection LED electronic display, obtain required output voltage by the high frequency transformer of selecting to have corresponding turn ratio.

As optional technical scheme, the power supply that is adopted is output as frequency conversion output, and the ac frequency of its output changes with load variations.As another optional technical scheme, the power supply that is adopted is output as decides frequency output, and the alternating current of its output is a fixed frequency.

Further, the present invention also provides a kind of LED electronic display method of supplying power to, in this method of supplying power to, adopts above-mentioned LED electronic display electric power system to power.

In the LED electronic display method of supplying power to provided by the invention, power-switching circuit and the LED electronics be made up of high frequency transformer and rectifier filter show that module is installed on the same module, form a display module, as optional technical scheme, the output of power supply is connected with display module by lead, and can connect a plurality of display modules; As another optional technical scheme, between power supply output and the display module and all adopt the bus parallel connection mode to be connected between each display module, make the AC power cord of described power supply output be transferred to next display module from a display module by multi-pin connector.

In the LED electronic display method of supplying power to provided by the invention, a plurality of power-switching circuits of being made up of high frequency transformer and rectifier filter are installed in and form a power supply modular converter on the same module, high frequency transformer in each power-switching circuit has identical or different turn ratio, make the power supply modular converter have the identical or different direct current output of multichannel pressure value, the alternating current of power supply output is behind this power supply modular converter, and output multi-channel DC voltage is transferred to the LED electronics nearby and shows module.

Technique effect of the present invention is, by the change of electric power system and method for supplying power to, both made things convenient for the transmission of electric energy, and the acquisition of the required different rated operational voltages of convenient energy-saving type display screen again is with at rated operational voltage LED electronic display power supply inequality; Thereby can make the pressure drop of the constant-current driving control circuit that drives electronic display LED fluorescent tube be arranged on minimum zone, reduce the power consumption of constant-current driving control circuit; Further, can reduce the caloric value of constant-current driving control circuit, thereby reduce the temperature rise of LED display system, increase the job stability and the life-span of LED display system.By the change of whole system method of supplying power to, the power consumption efficiency of system and the efficient of power supply are improved greatly, the mode of production is easier, and cost also is reduced.Therefore, this LED electronic display electric power system has characteristics low in energy consumption, that stability is high, the life-span is long and cost is low.

Description of drawings

Fig. 1 is traditional LED electronic display electric power system schematic diagram.

Fig. 2 is traditional LED electronic display method of supplying power to connection diagram.

Fig. 3 is a power supply architecture schematic diagram in the LED electronic display electric power system provided by the present invention.

Fig. 4 is the LED electronic display method of supplying power to first embodiment schematic diagram provided by the present invention.

Fig. 5 is the LED electronic display method of supplying power to second embodiment schematic diagram provided by the present invention.

Fig. 6 is LED electronic display method of supplying power to the 3rd an embodiment schematic diagram provided by the present invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

Fig. 3 is a power supply architecture schematic diagram in the LED electronic display electric power system provided by the present invention.

As shown in Figure 3, the power supply architecture that is adopted in the LED electronic display electric power system provided by the invention, be output as the high-frequency ac voltage of square waveform, its high-frequency ac output and civil power input isolated from power, and the effective voltage scope of institute's output AC voltage is 10V～200V, and frequency range is 10KHz～1000KHz.Because output voltage is higher, as 48V, does not need rectification again, so the work of power supply and conversion efficiency are very high.

Simultaneously, in order to realize the simple and effective of whole electric power system, the power supply that is adopted in this embodiment is output as the frequency conversion or the fixed alternating voltage frequently of square wave, this high-frequency ac voltage in power-switching circuit the high frequency transformer step-down and the rectifier filter rectifying and wave-filtering after with of the output of low-voltage direct method for electrically as electric power system, wherein, high frequency transformer has fixing turn ratio, by selecting the high frequency transformer of different turn ratios, the voltage of exportable different magnitudes of voltage, thus satisfy the LED electronic display job requirement of different rated operational voltages.

This embodiment also provides a kind of method of supplying power to of LED electronic display.

Fig. 4 is the LED electronic display method of supplying power to first embodiment schematic diagram provided by the present invention.

As shown in Figure 4, power-switching circuit and the LED electronics be made up of high frequency transformer and rectifier filter show that module is installed on the same module, form a display module, and the output of power supply is connected with display module by lead, and connects a plurality of display modules simultaneously.Because the alternating voltage of power supply output is higher, can transmit farther distance in low-loss ground, the alternating voltage of power supply output can be transferred to next display screen module from a display screen module, makes the easier economy of mounting structure.

Fig. 5 is the LED electronic display method of supplying power to second embodiment schematic diagram provided by the invention.

As shown in Figure 5, power-switching circuit and the LED electronics be made up of high frequency transformer and rectifier filter show that module is installed on the same module, form a display module, between power supply output and the display module and all adopt the bus parallel connection mode to be connected between each display module, the alternating voltage of power supply output is connected with described display module by lead, and can connect a plurality of display modules.

Fig. 6 is LED electronic display method of supplying power to the 3rd an embodiment schematic diagram provided by the invention.

As shown in Figure 6, a plurality of power-switching circuits are installed in and form a power supply modular converter on the same module, high frequency transformer in each power-switching circuit has identical or different turn ratio, make the power supply modular converter have the identical or different direct current output of plurality of voltages value, the alternating current of power supply output is behind this power supply modular converter, and output multi-channel DC voltage is transferred to the LED electronics nearby and shows module.In this embodiment, the power supply modular converter is converted to the multichannel low-voltage DC with the alternating current of power supply output simple and effective, and this driver module can be installed near the LED display module, is convenient to the connection of system's each several part.

Under situation without departing from the spirit and scope of the present invention, can also constitute many very embodiment of big difference that have.Should be appreciated that except as defined by the appended claims, the invention is not restricted at the specific embodiment described in the specification.

Claims (11)

1. LED electronic display electric power system, comprise power supply and power-switching circuit, described power-switching circuit comprises high frequency transformer and rectifier filter, it is characterized in that, the output of described power supply be the high-frequency ac voltage of square waveform, behind described high frequency transformer step-down and described rectifier filter rectifying and wave-filtering with of the output of low-voltage direct power mode as described electric power system.

2. LED electronic display electric power system according to claim 1 is characterized in that, the high-frequency ac output of described power supply and civil power input isolated from power, and the effective voltage scope of described power supply output AC voltage is 10V～200V.

3. LED electronic display electric power system according to claim 2 is characterized in that the alternating voltage frequency range that described power supply is exported is 10KHz～1000KHz.

4. LED electronic display electric power system according to claim 3 is characterized in that, described power supply is fixed output frequently, and the alternating current of its output is a fixed frequency.

5. LED electronic display electric power system according to claim 3 is characterized in that, described power supply is frequency conversion output, and the ac frequency of its output changes with load variations.

6. LED electronic display electric power system according to claim 1 is characterized in that described high frequency transformer has fixing turn ratio, controls the magnitude of voltage of output with this.

7. LED electronic display method of supplying power to that adopts the described electric power system of claim 1 to power, it is characterized in that, described power-switching circuit and LED electronics show that module is installed on the same module, form a display module, and the output of described power supply is connected with described display module by lead, and can connect a plurality of display modules.

8. LED electronic display method of supplying power to that adopts the described electric power system of claim 1 to power, it is characterized in that, described power-switching circuit and LED electronics show that module is installed on the same module, form a display module, and between the output of described power supply and the display module and all adopt the bus parallel connection mode to be connected between each display module, make the AC power cord of described power supply output be transferred to next display module from a display module by multi-pin connector.

9. LED electronic display method of supplying power to that adopts the described electric power system of claim 1 to power, it is characterized in that, a plurality of described power-switching circuits are installed in and form a power supply modular converter on the same module, the alternating current of described power supply output is behind this power supply modular converter, and output multi-channel DC voltage is transferred to the LED electronics nearby and shows module.

10. LED electronic display method of supplying power to according to claim 9 is characterized in that, the high frequency transformer in the described supply module in each power supply conversion circuit has different turn ratios, the pressure value difference of its each road output voltage.

11. LED electronic display method of supplying power to according to claim 9 is characterized in that, the high frequency transformer in the described supply module in each power supply conversion circuit has identical turn ratio, and the pressure value of its each road output voltage is identical.

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