CN203387472U

CN203387472U - Constant-pressure digital power amplifier for metro light rail broadcasting system

Info

Publication number: CN203387472U
Application number: CN201320401115.2U
Authority: CN
Inventors: 卢世璜; 周宇
Original assignee: Bohai Sea Tianjin Ao Li Electronics Co Ltd
Current assignee: Bohai Sea Tianjin Ao Li Electronics Co Ltd
Priority date: 2013-07-08
Filing date: 2013-07-08
Publication date: 2014-01-08
Anticipated expiration: 2023-07-08

Abstract

The utility model discloses a constant-pressure digital power amplifier for a metro light rail broadcasting system. The constant-pressure digital power amplifier for the metro light rail broadcasting system utilizes an integral insertion joint type machine case and comprises a front panel (1), a machine casing case (2) and a rear panel (3); a power switch (4), a power display (5), a work display (6) and an overload display (7) are arranged on the front panel (4); a switch power supply (9), a digital power simplifier module (8) and an output transformer (10) are arranged inside the machine case. The constant-pressure digital power amplifier for the metro light rail broadcasting system has the advantages of being low in power consumption, low in temperature rising, small in size and high in technical performance index due to the fact that an original frequently-used analogue circuit is replaced by the advanced digital audio technology, solving utilization disadvantages, being adaptive to continuous operation for a long time, having high technical performance indexes and reliability, reducing production costs due to a module type circuit structure, simplifying production procedures and being convenient to produce.

Description

Subway light rail broadcast system level pressure digital power amplifier

Technical field

The utility model belongs to the power output device of system in electronic equipment, for subway, light rail broadcast system, for speaker system provides driving power, relates in particular to a kind of subway light rail broadcast system level pressure digital power amplifier.

Background technology

In broadcast system as the terminal output stage of system equipment, it is the key equipment that guarantees the broadcast effect, due to the output that electrical power is arranged, therefore general power cost of power amplifier is large, temperature rise, and volume is large, take the main space of broadcast rack, require technical performance index high, reliability is high simultaneously, can move continuously for a long time.

The utility model content

For the deficiencies in the prior art, the purpose of this utility model is to provide a kind of subway light rail broadcast system level pressure digital power amplifier, has characteristics low in energy consumption, that temperature rise is low, volume is little.

To achieve these goals, the technical solution of the utility model is as follows:

The utility model provides a kind of subway light rail broadcast system level pressure digital power amplifier, adopt integral plugged formula cabinet, comprise: front panel, casing case, rear board, front panel is provided with mains switch, power supply demonstration, work demonstration, overload demonstration, and cabinet is built-in with: Switching Power Supply, digital power amplifier module, output transformer.

As a kind of preferred technical scheme, described Switching Power Supply is SMPS500N-FU, and alternating current input adopts the VH3.96-3P connector to connect, and No. 1 position of connector and No. 3 positions connect respectively live wire and the zero line of alternating current, and No. 2 position is vacant; Main output adopts the VH3.96-3P connector to connect, and No. 1 position of connector is V+, and No. 2 positions are G, and No. 3 positions are V-; Auxiliary be output as ± 12V1A, ± 12V exports and adopts the connection of XH2.54-3P connector, No. 1 position of connector to be-12V, and No. 2 position is ground GND, and No. 3 position is+12V; The 12V fan adopts the 2510-3P connector to connect with power supply, and No. 1 position of connector is vacant, and No. 2 position is+12V, and No. 3 positions are ground GND; Main output is independent with auxiliary output.

As a kind of preferred technical scheme, described digital power amplifier module be provided with main power source input interface, signal input interface, ± 12V power input interface, volume control interface, state indication interface, signal output interface.

As a kind of preferred technical scheme, the input of described signal input interface adopts the XH2.54-2P connector to connect, and is input as the simulation single ended mode, adopts transformer coupled signal isolation, input impedance 600 Ω, the maximum input sensitivity 0.775V of realizing; No. 1 position of connector is input signal IN, and No. 2 positions are input signal ground GND.

As a kind of preferred technical scheme, the output of described signal output interface adopts the VH3.96-2P connector to connect, and No. 1 position of connector is output ground G, and No. 2 positions are output signal OUT.

As a kind of preferred technical scheme, the input of described ± 12V power input interface adopts the XH2.54-3P connector to connect, and No. 1 position of connector is-the 12V input, and No. 2 positions are power supply ground G, and No. 3 position is+the 12V input.

As a kind of preferred technical scheme, the input of described main power source input interface adopts the VH3.96-3P connector to connect, and No. 1 position of connector is the anodal V+ of main power source, and No. 2 position is vacant, and No. 3 positions are main power source negative pole G.

As a kind of preferred technical scheme, described volume control interface, for external volume control potentiometer, adopts the XH2.54-3P connector to connect, and No. 1 position of connector is ground G, and No. 2 positions are the potentiometer sliding end, and No. 3 positions are signal end.

As a kind of preferred technical scheme, described state indication interface provides power supply indication, overload/short circuit indication, signal designation, amplitude limit indication by external 4 LED; The state indication adopts the XH2.54-5P connector to connect, and No. 1 position of connector is ground G, and No. 2 positions are power supply indication POW, and No. 3 position is overload/short circuit indication OC, and No. 4 positions are signal designation SN, and No. 5 positions are amplitude limit indication LIM; The LED anode meets respectively POW, OC, SN, LIM, and negative electrode meets G.

As a kind of preferred technical scheme, it is output that described subway light rail broadcast system adopts the step-up transformer mode with the level pressure digital power amplifier, transformer voltage ratio is 1:2.5, the 40V audio voltage is transformed to 100V, and transformer is annular, adopts HD Audio, power amplifier is of a size of: wide is 95mm, height is 170mm, is 480mm deeply, weight 6.5Kg.

The utility model compared with prior art, has the following advantages and beneficial effect:

The utility model adopts advanced digital audio technology to replace former analog circuit commonly used, realized low in energy consumptionly, temperature rise is low, and volume is little, technical performance index is high, solved the shortcoming of using, can adapt to long-term operation work continuously, higher reliability has been arranged, adopt the modular circuit structure, reduce production cost, simplified production process, more in production.

The accompanying drawing explanation

Fig. 1 is the outline drawing of subway light rail broadcast system with the level pressure digital power amplifier.

Fig. 2 is the schematic diagram of rear board.

Fig. 3 is the internal structure block diagram of digital power amplifier module.

Embodiment

Below in conjunction with embodiment, the utility model is described in further detail.

Embodiment

As shown in Figure 1, Figure 2, Figure 3 shows, Fig. 1 is the outline drawing of subway light rail broadcast system with the level pressure digital power amplifier; Fig. 2 is the schematic diagram of rear board; Fig. 3 is the internal structure block diagram of digital power amplifier module.

A kind of subway light rail broadcast system level pressure digital power amplifier, adopt integral plugged formula cabinet, comprise: front panel 1, casing case 2, rear board 3, front panel 1 is provided with mains switch 4, power supply demonstration 5, work demonstration 6, overload demonstration 7, and cabinet is built-in with: Switching Power Supply 9, digital power amplifier module 8, output transformer 10.

Switching Power Supply SMPS500N-FU

This series switch power supply, according to the design of power amplifier work characteristics, mainly is applicable to digital power amplifier.

Peak power output: 500W

Characteristics: the load characteristic identical with power frequency supply, lower than the cost advantage of power frequency supply, volume is little lightweight, low EMI, high reliability.

The alternating current input:

110/220VAC can select.The alternating current input adopts VH3.96-3P connector to connect.No. 1 position of connector and No. 3 positions connect respectively live wire and the zero line of alternating current, and No. 2 position is vacant.

Main output: (with sub-model corresponding relation, seeing the following form 1)

Table 1

Model	V+	G	V-
				SMPS500N（±60V）-FU	+60V5A	0	-60V5A
SMPS500N（±70V）-FU	+70V4A	0	-70V4A
				SMPS500N（±75V）-FU	+75V4A	0	-75V4A
SMPS500N（±100V）-FU	+100V3A	0	-100V3A
				SMPS500N（60V）-FU	60V10A		0	Vacant
SMPS500N（70V）-FU	70V8A		0						Vacant
				SMPS500N（75V）-FU	75V8A		0	Vacant
SMPS500N（100V）-FU	100V6A		0						Vacant

Main output adopts VH3.96-3P connector to connect.No. 1 position of connector is V+, and No. 2 positions are G, and No. 3 positions are V-.

Auxiliary output: ± 12V1A(can distribute the fan power supply)

± 12V output adopts XH2.54-3P connector to connect.No. 1 position of connector is-12V, and No. 2 position is ground GND, and No. 3 position is+12V.

The 12V fan adopts 2510-3P connector to connect with power supply.No. 1 position of connector is vacant, and No. 2 position is+12V, and No. 3 positions are ground GND.

Main output is independently with auxiliary output.

Safety event

SMPS500 adopts Open architecture, on plate subelement not with mains isolation, touch shock hazard arranged.In the not element of isolated area, particularly bare metal part, forbid to touch.

Heat radiation:

Generally use and adopt natural heat dissipation to get final product.In particular cases can adopt air blast cooling, to keep Power IC and device, good working temperature be arranged.

Size and installation location:

Overall dimension: 126mm*119mm*49mm

Location hole: 4*M3

Digital power amplifier module DPA200V-FU

General introduction:

DPA200V-FU is for the broadcast level pressure power amplifier design that connects output transformer, and dual feedback loops makes DPA200V-FU all have good distorted characteristic and frequency response in full power bandwidth, and damping coefficient is high, has perfect defencive function simultaneously.Its structure, function can meet miniaturization and Embedded Application, make the user carry out overall design simply, quickly and easily, put on market rapidly.

Characteristics:

Signal is isolated entirely, overcurrent/short-circuit protection, global feedback, filtering and amplitude limit

Characteristic index: power output: 200W@8 Ω, output voltage: 40V, THD+N:<1%, signal to noise ratio: 85dB, frequency response: 40Hz～16kHz, efficiency: 90%.

Interface message is as shown in table 2:

Table 2

Title	Describe
		IN	The signal input
GND	Signal ground
		+12V	The prime positive source
-12V	The prime power cathode
		G	Ground
V+	The power power-supply positive pole
		OUT	Power stage
VOLUME	Volume controls
		POW	The power supply indication
OC	Overload/short circuit indication
		SN	Signal designation
LIM	The amplitude limit indication

Absolute rating is as shown in table 3:

Table 3

Symbol	Parameter	Numerical value	Unit
				V+	Power power-supply voltage	200	V

+12V/-12V	The prime supply voltage	±16	V
				Ts	Storing temperature	-20～85	℃
Ta	Working temperature		0～45					℃

Annotate: exceed the above-mentioned parameter scope and will cause device failure

The recommended work condition is as shown in table 4:

Table 4

Symbol	Parameter	Minimum	The typical case	Maximum	Unit
						V+	Power power-supply voltage	?	140/2	?	V/A
+12V/-12V	The prime supply voltage	?	±12/500	?	V/mA

Electric parameter is as shown in table 5: (V+=140V, ± 12V, Ta=25 ℃ except as otherwise noted)

Table 5

Symbol

Parameter

Condition

Minimum

The typical case

Maximum

Unit

AV

Gain

1kHz

?

65

?

V/V

fPWM

Switching frequency

?

350

?

kHz

Characteristic is as shown in table 6: (V+=140V, ± 12V, f=1kHz, the filtering of 22kHz bandwidth, Ta=25 ℃ except as otherwise noted)

Table 6

Application message:

Signal input interface

Input adopts XH2.54-2P connector to connect.Be input as the simulation single ended mode, adopt transformer coupled signal isolation, input impedance 600 Ω, the maximum input sensitivity 0.775V of realizing.No. 1 position of connector is input signal IN, and No. 2 positions are input signal ground GND.

Signal output interface

Output adopts VH3.96-2P connector to connect.No. 1 position of connector is output ground G, and No. 2 positions are output signal OUT.When separately DPA200V being tested, should note the connection of instrument ground wire, preferably adopt differential mode probe or by front and back level instrument " " separately, otherwise may cause protection so that damage DPA200V-FU, instrument.

± 12V power input interface

The input of ± 12V power supply adopts XH2.54-3P connector to connect.No. 1 position of connector is-the 12V input, and No. 2 positions are power supply ground G, and No. 3 position is+the 12V input.

The main power source input interface

The main power source input adopts VH3.96-3P connector to connect.No. 1 position of connector is the anodal V+ of main power source, and No. 2 position is vacant, and No. 3 positions are main power source negative pole G.

The volume control interface

For external volume control potentiometer, adopt XH2.54-3P connector to connect.No. 1 position of connector is ground G, and No. 2 positions are the potentiometer sliding end, and No. 3 positions are signal end.

State indication interface

DPA200V-FU can provide power supply indication, overload/short circuit indication, signal designation, amplitude limit indication by external 4 LED.The state indication adopts XH2.54-5P connector to connect.No. 1 position of connector is ground G, and No. 2 positions are power supply indication POW, and No. 3 position is overload/short circuit indication OC, and No. 4 positions are signal designation SN, and No. 5 positions are amplitude limit indication LIM.The LED anode meets respectively POW, OC, SN, LIM, and negative electrode meets G.

Heat dissipation design

DPA200V-FU has aluminium radiator, but still needs air blast cooling, venting practice that should be reasonable in design according to casing structure in some application.

Power supply: DPA200V-FU without specific (special) requirements, can adopt Switching Power Supply or linear power supply power supply to the voltage regulation performance of power power-supply V+, and front level power supply needs the stabilized voltage power supply of +/-12V500mA.

Defencive function

DPA200V-FU has overload/short-circuit protection function.When overload/short circuit occurs, the intermittent output of power amplifier, now should check the output loading situation, the rear automatic recovery normal operation of fixing a breakdown.

Overall dimension: 115(is long) * 119(is wide) * 49(is high) (unit: mm)

Mounting-positioning holes size: 4*M3

It is output that the subway light rail broadcast system adopts the step-up transformer mode with the level pressure digital power amplifier, transformer voltage ratio is 1:2.5, and the 40V audio voltage is transformed to 100V, and transformer is annular, adopt high-fidelity technique to make, guarantee the voltage output characteristics of determining of HD Audio.Power amplifier is of a size of: wide is 95mm, and height is 170mm, is 480mm deeply, weight 6.5Kg.

The utility model technology can be applied to, in similar broadcast system engineering, can obtain high-quality, reliable practical function.

The above-mentioned description to embodiment is can understand and apply the utility model for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.Therefore, the utility model is not limited to the embodiment here, and those skilled in the art are according to announcement of the present utility model, and not breaking away from the improvement that the utility model category makes and revise all should be within protection range of the present utility model.

Claims

1. a subway light rail broadcast system level pressure digital power amplifier, it is characterized in that, adopt integral plugged formula cabinet, comprise: front panel (1), casing case (2), rear board (3), front panel (1) is provided with mains switch (4), power supply shows that (5), work show that (6), overload show (7), and cabinet is built-in with: Switching Power Supply (9), digital power amplifier module (8), output transformer (10).

2. subway light rail broadcast system level pressure digital power amplifier according to claim 1, it is characterized in that, described Switching Power Supply is SMPS500N-FU, the alternating current input adopts the VH3.96-3P connector to connect, No. 1 position of connector and No. 3 positions connect respectively live wire and the zero line of alternating current, and No. 2 position is vacant; Main output adopts the VH3.96-3P connector to connect, and No. 1 position of connector is V+, and No. 2 positions are G, and No. 3 positions are V-; Auxiliary be output as ± 12V1A, ± 12V exports and adopts the connection of XH2.54-3P connector, No. 1 position of connector to be-12V, and No. 2 position is ground GND, and No. 3 position is+12V; The 12V fan adopts the 2510-3P connector to connect with power supply, and No. 1 position of connector is vacant, and No. 2 position is+12V, and No. 3 positions are ground GND; Main output is independent with auxiliary output.

3. subway light rail broadcast system level pressure digital power amplifier according to claim 1, it is characterized in that, described digital power amplifier module be provided with main power source input interface, signal input interface, ± 12V power input interface, volume control interface, state indication interface, signal output interface.

4. subway light rail broadcast system level pressure digital power amplifier according to claim 3, it is characterized in that, the input of described signal input interface adopts the XH2.54-2P connector to connect, be input as the simulation single ended mode, adopt the transformer coupled signal isolation that realizes, input impedance 600 Ω, maximum input sensitivity 0.775V; No. 1 position of connector is input signal IN, and No. 2 positions are input signal ground GND.

5. subway light rail broadcast system level pressure digital power amplifier according to claim 3, is characterized in that, the output of described signal output interface adopts the VH3.96-2P connector to connect, and No. 1 position of connector is output ground G, and No. 2 positions are output signal OUT.

6. subway light rail broadcast system level pressure digital power amplifier according to claim 3, it is characterized in that, the input of described ± 12V power input interface adopts the XH2.54-3P connector to connect, and No. 1 position of connector is-the 12V input, No. 2 positions are power supply ground G, and No. 3 position is+the 12V input.

7. subway light rail broadcast system level pressure digital power amplifier according to claim 3, it is characterized in that, the input of described main power source input interface adopts the VH3.96-3P connector to connect, and No. 1 position of connector is the anodal V+ of main power source, No. 2 position is vacant, and No. 3 positions are main power source negative pole G.

8. subway light rail broadcast system level pressure digital power amplifier according to claim 3, it is characterized in that, described volume control interface is for external volume control potentiometer, adopt the XH2.54-3P connector to connect, No. 1 position of connector is ground G, No. 2 positions are the potentiometer sliding end, and No. 3 positions are signal end.

9. subway light rail broadcast system level pressure digital power amplifier according to claim 3, is characterized in that, described state indication interface provides power supply indication, overload/short circuit indication, signal designation, amplitude limit indication by external 4 LED; The state indication adopts the XH2.54-5P connector to connect, and No. 1 position of connector is ground G, and No. 2 positions are power supply indication POW, and No. 3 position is overload/short circuit indication OC, and No. 4 positions are signal designation SN, and No. 5 positions are amplitude limit indication LIM; The LED anode meets respectively POW, OC, SN, LIM, and negative electrode meets G.

10. subway light rail broadcast system level pressure digital power amplifier according to claim 1, it is characterized in that, adopting the step-up transformer mode is output, transformer voltage ratio is 1:2.5, and the 40V audio voltage is transformed to 100V, and transformer is annular, power amplifier is of a size of: wide is 95mm, height is 170mm, is 480mm deeply, weight 6.5Kg.