CN2798454Y

CN2798454Y - Auxiliary electrical source circuit for hotel TV

Info

Publication number: CN2798454Y
Application number: CN 200520083915
Authority: CN
Inventors: 赵瑜
Original assignee: Hisense Group Co Ltd; Qingdao Hisense Electronics Co Ltd
Current assignee: Hisense Group Co Ltd; Qingdao Hisense Electronics Co Ltd
Priority date: 2005-06-06
Filing date: 2005-06-06
Publication date: 2006-07-19
Anticipated expiration: 2015-06-06

Abstract

The utility model relates to an auxiliary electrical source circuit for hotel televisions, which comprises a rectifying filtering device, a resistor R003 and a charging capacitor which are connected between an AC and a 4 foot of an integrated circuit STR-G6351, etc. An output end of a rectification circuit and a 1 foot of the STR-G6351 are respectively connected with both ends of primary windings 1, 3 of a switch transformer T001. A 4 end of the other winding of the T001 is connected with a 4 foot of the STR-G6351 via a rectifying diode VD002. A 3 end of the T001 is connected with a two foot of the STR-G6351 via a resistor R004, and a resistor R005 is connected between a 2 foot and a 5 foot of the STR-G6351.10, 9 ends of the T001 can respectively output +12V and +5V DC after diode rectification, capacitor filtering and voltage stabilizing by a voltage stabilizer, and an 8 end can output +3.3V DC after diode rectification, capacitor and inductor filtering. The utility model is added with the functions of clock displaying, emergency alarming, etc., the utility model can continuously receive the network control of hotel television systems and the utility model can be widely used in various hotels.

Description

The auxiliary power circuit of hotel television set

Technical field

The utility model belongs to the TV set circuit technical field, more particularly relates to the design of the auxiliary power circuit of hotel television set.

Background technology

The normal domestic use television set has only a Switching Power Supply, can export+5V, and+12V ,+26V, several voltages such as+130V are supplied with parts such as television set line output and sound.After the domestic television set shutdown, internal electric source quits work.

The hotel control system needs non-stop run, should have functions such as real-time clock demonstration, audible alarm.The hotel television set belongs to the part of hotel control system, so the hotel television set need insert the special-purpose plug-in card that contains the little processing decoder of LCU, plug-in card operate as normal needs+3.3V ,+5V ,+uninterrupted power supply of 12V.That is to say that the hotel television set should have auxiliary power.After the shutdown, its auxiliary power should still be worked, and continues as circuit supplies such as clock, warning, and continues the special-purpose plug-in card power supply to the little processing decoder of LCU.

Summary of the invention

The purpose of this utility model just is to overcome above-mentioned shortcoming and defect, and the auxiliary power circuit of a kind of hotel television set is provided.It make the hotel television set not only can be as general television set received television program, but also increased that clock shows and functions such as emergency alarm, and can uninterruptedly receive hotel television system networking control.

In order to achieve the above object, the utility model is connected in parallel on the 220V AC socket of television set, is positioned at before the former mains switch of television set.It comprises rectification circuit, be connected the filter circuit of rectification circuit output end, be connected resistance R 003,4 pin that are connected STR-G6351 and the charging capacitor between the ground etc. between 4 pin of alternating current and integrated circuit STR-G6351.1 pin of rectification circuit output end and STR-G6351 is connected to (1), (3) two ends of the elementary winding of switch transformer.(4) of another winding of switch transformer end is connected on 4 pin of STR-G6351 through rectifier diode VD002, switch transformer (5) end ground connection.(3) of elementary winding end is connected with 2 pin of STR-G6351 through resistance R 004, and resistance R 005 is connected between 2 pin of STR-G6351 and 5 pin and through capacitor C 006 and is connected with R004.(10) end output+12V direct current after diode rectification, capacitor filtering, pressurizer voltage stabilizing of switch transformer secondary winding.(9) end output+5V direct current after diode rectification, capacitor filtering, pressurizer voltage stabilizing of secondary winding.(8) end output+3.3V direct current behind diode rectification, electric capacity and inductor filter of secondary winding, (6) end ground connection.

Its inside of integrated circuit STR-G6351 comprises control circuit and MOS power tube.Alternating current is delivered on the rectification circuit, passes through the filtering capacitor filtering again, becomes the power supply of switching circuit.Alternating current enters STR-G6351 inside by 003 pair of charging capacitor C007 charging of resistance R, and the STR-G6351 circuit is started working.STR-G6351 obtains after the power work, switch transformer produces pulse signal, produce oscillator signal when reaching oscillating circuit, wherein the pulse signal of (4), the generation of (5) end winding provides stable voltage for charging capacitor C007 through rectifier diode VD002 rectification.

Power supply belongs to independent-excited in parallel, is operated in the quasi-resonance mode.The inner oscillator signal that produces of STR-G6351 drives the conducting of switch inside pipe, and just there is 300V voltage at (1) of T001, (3) two ends.Because of other winding of T001 all is instead to swash form, be equivalent to open circuit this moment, so its current increases only is decided by the inductance of this winding, growth rate is about 0.7A/ μ S.During this current flowing resistance R004, obtain the voltage identical with current waveform, this voltage is passed to 5 pin of STR-G6351 by R005, and when 5 pin voltages during greater than 0.7V, conducting finishes the internal circuit on-off switching tube period.Electric current flows out from 3 pin.

Enter the source electrode of metal-oxide-semiconductor from 2 pin of STR-G6351, in and the electronics of grid, MOS just can quick closedown.Switching tube is closed, and has not just had electric current in the primary coil of T001, and each secondary winding induces rightabout voltage, and these voltages are respectively through separately diode rectification, and capacitor filtering forms direct current.The secondary induction voltage of T001 behind diode rectification respectively output+3.3V1.5A ,+5V1.2A ,+12V 0.6A.

(9) end of switch transformer secondary winding also is connected with 1 pin of photoelectrical coupler behind diode rectification.2 pin of photoelectrical coupler are through controlling circuit of voltage regulation Z001 ground connection, the control utmost point resistance grounded of Z001.5 pin of photoelectrical coupler connect 4 pin of STR-G6351, and 4 pin of photoelectrical coupler connect 5 pin of STR-G6351 through resistance R 011.

For regulated output voltage, taked the secondary detection mode.Obtain 2.5V voltage at the voltage stabilizing control integrated circuit Z001TL431 control utmost point.Error signal is amplified through Z001, by the N005 photoelectrical coupler, through 5 pin of R011 control STR-G6351.The STR-G6351 chip internal has the function of detected temperatures, and when temperature in the sheet was spent above 145, oscillator just quit work.When 4 pin voltages were higher than 22.5V, overvoltage protection started.As long as the voltage after electric current is taken a sample through R004 on 5 pin is higher than 0.7V, switching tube just is closed.The overcurrent that causes owing to reasons such as load increases is recoverable, as long as excessive current vanishes, oscillator is just resumed work.

(10), the rectifier diode on (9) end that are connected the switch transformer secondary winding are the low saturation voltage drop Schottky rectifier diode of the big electric current of IN5822 type, and its pressurizer is respectively KA278R12 type and the low saturation voltage drop pressurizer of the big electric current of KA378R05 type.

Task of the present utility model comes to this and finishes.

The utility model make the hotel television set not only can be as general television set received television program, but also increased that clock shows and functions such as emergency alarm, and can uninterruptedly receive hotel television system networking control.It has increased auxiliary power, has newly designed the Switching Power Supply of small-power low power consumption and high reliability.Major parameter is+3.3V1.5A ,+5V1.2A ,+12V 0.6A.Auxiliary power is clock demonstration, audible alarm and the power supply of LCU control assembly of hotel TV.Auxiliary power is not established mains switch, and main power source is established mains switch.The auxiliary power of setting up meets safety requirements, and main power source can cut off like this, to satisfy European safety requirements, reduces the mains power failure rate.But its wide popularization and application is in the hotel of various class, restaurant, hostel.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Embodiment

Embodiment 1.The auxiliary power circuit of a kind of hotel television set, as shown in Figure 1.Television set main power source part is represented with block diagram.SW1 can only control the television set main power source.It is connected in parallel on the 220V AC socket of television set, is positioned at before the switch SW 1 of former power supply main power source of television set.It comprises rectification circuit N001, be connected the filter circuit C003 of rectification circuit N001 output, be connected resistance R 003,4 pin that are connected STR-G6351 and the charging capacitor C007 between the ground etc. between 4 pin of alternating current and integrated circuit (N002) STR-G6351.1 pin of rectification circuit N001 output and STR-G6351 is connected to (1), (3) two ends of the elementary winding of switch transformer T001.(4) of another winding of switch transformer T001 end is connected on 4 pin of STR-G6351 through rectifier diode VD002, (5) end ground connection of switch transformer T001.(3) of elementary winding end is connected with 2 pin of STR-G6351 through resistance R 004, and resistance R 005 is connected between 2 pin of STR-G6351 and 5 pin and through capacitor C 006 and is connected with R004.(10) end output+12V direct current after diode VD003 rectification, capacitor C 008 filtering, pressurizer N003 voltage stabilizing of the secondary winding of switch transformer T001.(9) end output+5V direct current after diode VD004 rectification, capacitor C 010 filtering, pressurizer N004 voltage stabilizing of secondary winding.(8) end output+3.3V direct current behind diode VD005 rectification, capacitor C 012 and inductor filter of secondary winding.(6) end ground connection of secondary winding.

(9) end of the secondary winding of switch transformer T001 also is connected with 1 pin of photoelectrical coupler N005 after diode VD004 rectification.2 pin of photoelectrical coupler N005 are through controlling circuit of voltage regulation Z001 ground connection, the control utmost point resistance grounded of Z001.5 pin of photoelectrical coupler N005 connect 4 pin of STR-G6351, and 4 pin of photoelectrical coupler N005 connect 5 pin of STR-G6351 through resistance R 011.

(10), the rectifier diode VD003 on (9) end and the VD004 that are connected switch transformer T001 secondary winding are the low saturation voltage drop Schottky rectifier diode of the big electric current of IN5822 type, and its pressurizer N003 and N004 are respectively KA278R12 type and the low saturation voltage drop pressurizer of the big electric current of KA378R05 type.

+ 3.3V ,+5V ,+12V power supply supply LCU assembly plate ,+5V power supply is then supplied with assemblies such as clock and warning.

Embodiment 1 make the hotel television set not only can be as general television set received television program, but also increased that clock shows and functions such as emergency alarm, and can uninterruptedly receive hotel television system networking control.But its wide popularization and application is in the hotel of various class, restaurant, hostel.

Claims

1. the auxiliary power circuit of a hotel television set, it is connected in parallel on the 220V AC socket of television set, be positioned at before the former mains switch of television set, it is characterized in that it comprises rectification circuit, be connected the filter circuit of rectification circuit output end, be connected the resistance R 003 between 4 pin of alternating current and integrated circuit STR-G6351, be connected 4 pin of STR-G6351 and the charging capacitor between the ground, 1 pin of rectification circuit output end and STR-G6351 is connected to (1) of the elementary winding of switch transformer, (3) two ends, (4) end of another winding of switch transformer is connected on 4 pin of STR-G6351 through rectifier diode VD002, switch transformer (5) end ground connection, (3) end of elementary winding is connected with 2 pin of STR-G6351 through resistance R 004, resistance R 005 is connected between 2 pin of STR-G6351 and 5 pin and through capacitor C 006 and is connected with R004, (10) end of switch transformer secondary winding is through diode rectification, capacitor filtering, output+12V direct current after the pressurizer voltage stabilizing, (9) end of secondary winding is through diode rectification, capacitor filtering, output+5V direct current after the pressurizer voltage stabilizing, (8) end of secondary winding is through diode rectification, output+3.3V direct current behind electric capacity and the inductor filter, (6) end ground connection.

2. according to the auxiliary power circuit of the described hotel of claim 1 television set, (9) end that it is characterized in that said switch transformer secondary winding also is connected with 1 pin of photoelectrical coupler behind diode rectification, 2 pin of photoelectrical coupler are through controlling circuit of voltage regulation Z001 ground connection, the control utmost point resistance grounded of Z001,5 pin of photoelectrical coupler connect 4 pin of STR-G6351, and 4 pin of photoelectrical coupler connect 5 pin of STR-G6351 through resistance R 011.

3. according to the auxiliary power circuit of claim 1 or 2 described hotel television sets, (10), the rectifier diode on (9) end that it is characterized in that being connected the switch transformer secondary winding are the low saturation voltage drop Schottky rectifier diode of the big electric current of IN5822 type, and pressurizer is respectively KA278R12 type and the low saturation voltage drop pressurizer of the big electric current of KA378R05 type.