CN2079393U - Energy-saving wide voltage-stabilizing ac/dc white/black tv set - Google Patents

Abstract

The utility model relates to a white/black TV set using a low-voltage-switching power supply circuit. The power supply circuit of the energy-saving wide voltage-stabilizing AC/DC white/black TV set comprises a power switch K-[1], a full-wave rectifier transformer B, a bridge rectifier circuit composed of diodes D-[1], D-[2], D-[3] and D-[4], a battery-cell plug socket C, a fuse XB, capacitances C-[1] and C-[2], electric resistances R-[1] and R-[2], a switch voltage stabilizing circuit I, a picture and line-field scanning circuit II and a sound circuit III. The energy-saving wide voltage-stabilizing AC/DC white/black TV set is characterized in that alternating current and direct current (battery cell) can be used at the same time and can be used for any of them in singles; when power supply voltage is changed between 120V to 300V, the energy-saving wide voltage-stabilizing AC/DC white/black TV set can be watched normally; the complete-machine power consumption of the energy-saving wide voltage-stabilizing AC/DC white/black TV set does not exceed 25W when the electric voltage reaches 300V, and the complete-machine power consumption does not exceed 23W when the power supply voltage is 220V. The utility model has the advantages of energy conservation, wide voltage stabilization and the combination of the alternating-current/direct-current, and the utility model is suitable for any areas where abnormal power supply is provided.

Description

Energy-saving wide voltage-stabilizing AC/DC white/black TV set

The utility model relates to a kind of black and white television set that uses the low tension switch power circuit.

Some produces producer's employing low tension switch power circuit of black and white television set at present, and it is compared with traditional serial voltage-stabilizing power supply, has advantage energy-conservation and that reliability is high, and its manufacturing cost is lower than high-voltage switch power supply.The low tension switch power circuit that adopts as shown in Figure 1 at present.In order to improve the adaptability to changes that it externally comes change in voltage, general low tension switch power supply is all brought up to 22V to the secondary voltage of transformer B by 16V, to improve low-pressure performance, diode D1, D2, D3, D4 carry out rectification to the secondary 22V alternating voltage of transformer B, be divided into two-way through fuse xB to the D point: the one road supply with low tension switch power supply I, the direct voltage pulse duration is adjusted, make stable 12V direct voltage of its output, supply with the usefulness of black and white television set image and line-field sweep circuit II; Another road provides through rectifying and wave-filtering and does not add the usefulness of the direct voltage of voltage stabilizing to black and white television set sound accompaniment circuit III.Owing to following two reasons, can not connect line reconfiguration that D orders to the sound accompaniment circuit III in the E point.One, power consumption was minimum when the sound accompaniment circuit characteristics were noiseless, and when voice signal, maximum acoustic adds the sound accompaniment loss, can reach 5--6W(calculates with 2W output), after directly receiving voltage stabilizing adjustment pipe, then pipe being adjusted in voltage stabilizing is a very big burden, certainly will increase the failure rate that pipe is adjusted in voltage stabilizing; They are two years old, because image needs galvanic current to press, scope range of the fluctuation of voltage is big after adding sound accompaniment, then the problem of sound on vision just is difficult for solving, so, what current low tension switch power supply was best can only work below supply voltage is not less than interchange 150V, when supply voltage is when exchanging 22V, secondary direct voltage can be up to 30V, and at present dc battery jar has only 14V or 16V, thereby to use the low tension switch power supply and adopt supplied by AC/DC electricity at the black and white television set of producing at present be impossible with existing circuit diagram 1.

The purpose of this utility model is will provide a kind of energy-conservation, the black and white television set of wide voltage stabilizing AC/DC.

In order to realize the purpose of this utility model, redesign a kind of new black and white television set, its switching power circuit, as shown in Figure 2, it is by mains switch K1, full wave rectified transformer B, D1, D2, D3, the bridge rectifier that D4 forms, storage battery (direct current) socket C, fuse XB, resistance R 1, R2, the switch voltage-stabilizing circuit I, image and line-field sweep circuit II, the sound accompaniment circuit III is formed, power supply is alternating current 220V and 14V or 16V storage battery, its technical characterictic is: the positive pole of above-mentioned storage battery socket C and the secondary centre tap (4) of full wave rectified transformer B link the D1 in its negative pole and the bridge rectifier, D2 diode node E(is promptly) link, and AC/DC K switch 2 is housed, the upper end of this switch control sound accompaniment circuit III and the positive pole of storage battery socket C and the break-make of the anodal full wave rectified transformer secondary centre tap (4) that links with it, its lower end control switch voltage stabilizing circuit I reach the break-make that D that input with it links is ordered.

Concerning black and white television set image and line-field sweep circuit II, it is characterized in that: the ground end of this circuit II and storage battery socket C negative pole link, the other end and switching power supply I output link, the input of its switch voltage-stabilizing circuit I arrives the D point by AC/DC K switch 2 lower ends, be subjected to AC/DC K switch 2 control break-makes, and the D point is the anode of bridge rectifier by the node that fuse XB arrives D3, D4.

Concerning black and white television set sound accompaniment circuit III, it is characterized in that: the negative pole of the ground end of this circuit III and storage battery socket C links, the other end links by the upper end of AC/DC K switch 2 and the secondary centre tap (4) of full-wave rectifier B by resistance R 2, R1 again.Thereby make this machine obtain following new function: alternating current and direct current (storage battery) can use simultaneously, also can use its any separately, and when alternating current-direct current used simultaneously, storage battery was recharged, and only TV is not seen in charging yet, also can see the charging of TV limit in the limit; When alternating current cut off the power supply, storage battery can be powered, and normally watched to guarantee black and white television set; When voltage when 120V to 300V changes, use this utility model, also can normally watch, when supply power voltage during up to 320V (this situation only needs special full wave rectified transformer) its Overall Power Consumption be no more than 25W, during supply power voltage 220V, Overall Power Consumption is no more than 23W.

Specify as follows in conjunction with Fig. 2:

The loop is formed in power turn-on K switch 1,220V alternating current elementary terminal (1), (2) by full wave rectified transformer B, and voltage is reduced to 32V, i.e. two 16V up and down.The operating voltage of switch voltage-stabilizing circuit I is about 45V, during through the switch voltage-stabilizing circuit I 45V direct-current working volts pulsewidth is adjusted, make it export a stable direct-current working volts 12V, make the image of black and white television set reach line-field sweep circuit II operate as normal mutually, and this moment, the voltage that the sound accompaniment circuit III of black and white television set obtains is actually the full-wave rectified voltage of D2 in the bridge rectifier, D1, diode composition, and through after resistance R 1, R2 and the C2 filtering, operating voltage is real to be about 18V.Therefore among Fig. 1 on the sound accompaniment circuit III added voltage ratio when supply voltage is 300V on the sound accompaniment circuit III in Fig. 2 added voltage also high, thereby the high-voltage performance of Fig. 2 is better than Fig. 1, and its low-pressure performance is to guarantee by being added to D point among Fig. 2 up to the voltage about 45V, being higher than the voltage that D is ordered among Fig. 1; Thereby Fig. 2 is come compared with Fig. 1, it is much wide that the voltage adaptation scope is wanted, and through experiment test repeatedly, can adapt to the change in voltage of 120V to 300V, and can guarantee that black and white television set normally watches.

When external storage battery being inserted Fig. 2 storage battery socket C, power turn-on K switch 1, AC/DC K switch 2, the 220V alternating current is by the elementary terminal of full wave rectified transformer B (1), (2), at this moment, the secondary terminal (3) of full wave rectified transformer B, (4), (5) are behind bridge rectifier, and the D point is for the E point, direct voltage about 45V is arranged, work for switch voltage-stabilizing circuit I, image and line-field sweep circuit II through capacitor C 1 filtering.Because the E point is the negative pole of storage battery, full wave rectified transformer centre cap (4) is the positive pole of storage battery, so the 18V pulse direct current can be seen the charging of TV limit in the limit to storage battery.

Power turn-on K switch 1 is opened AC/DC K switch 2, and then the black and white television set non-transformer is supplied with and do not worked at this moment, but storage battery socket C is not subjected to the control of AC/DC K switch 2, promptly can charge and not see TV.

Turn on the power switch K1, the AC/DC of closing K switch 2, the storage battery anode is supplied with the voltage of sound accompaniment circuit III 14V or 16V by AC/DC K switch 2 upper ends, and another route full wave rectified transformer centre cap (4) arrives the D point by the D3 in its secondary terminal (3), (5) and the bridge rectifier, D4 diode, is adjusted into by the switching power circuit I that the 12V direct current is supplied with image and the line-field sweep circuit II makes its operate as normal again.Above-mentioned D1, D2, D3, D4 diode are 1.5A/100V, fuse XB is 1A, R1 is a fusing resistor, resistance is 2.2 Ω, power is 0.125W, resistance R 2 and capacitor C 2 are the element of sound accompaniment filter circuit, and AC/DC K switch 2 is common dpdt double-pole double-throw (DPDT), and full wave rectified transformer and storage battery socket C are that the television set industry is general.Thereby at the bottom of the low price, cost.

Use the utility model, compare than known black and white television set now, have wide voltage stabilizing, alternating current-direct current and usefulness can normally be seen the advantage of TV during power failure.And energy-conservation, Overall Power Consumption is little, so broad practical prospect is arranged.China width of cloth source is vast, supply of electric power still has anxiety, it is undesired that vast rural area and outlying district and minority small and medium cities often power, voltage is everlasting and is changed between the 130V to 270V, uses the utility model can solve the problem that can not normally watch because of the undesired black and white television set that brings of powering fully.

Claims (3)

1, a kind of energy-conservation wide voltage stabilizing alternating current-direct current black and white television set, this electromechanics source circuit is by mains switch K ₁, full wave rectified transformer B, diode D ₁, D ₂, D ₃, D ₄The bridge rectifier of forming, storage battery socket C, fuse XB, capacitor C ₁, C ₂, resistance R ₁, R ₂, switch voltage-stabilizing circuit I, image and line-field sweep circuit II, the sound accompaniment circuit III is formed, and it is characterized in that: the positive pole of above-mentioned storage battery socket C and the secondary centre tap (4) of full wave rectified transformer B link the diode D in negative pole and the bridge rectifier ₁, D ₂Node E link, and the AC/DC K switch is housed ₂, the break-make between the upper end of this switch control sound accompaniment circuit III and the positive pole of storage battery socket C and the anodal with it full wave rectified transformer secondary centre tap (4) that links, this switch lower end control switch voltage stabilizing circuit I reach the break-make that D that output with it links is ordered.

2, energy-conservation wide voltage stabilizing alternating current-direct current black and white television set according to claim 1, the ground end and the storage battery socket C negative pole that it is characterized in that image and line-field sweep circuit II link, the other end and switch voltage-stabilizing circuit I output link, and the input of its switch voltage-stabilizing circuit I arrives the D point by AC/DC K switch 2 lower ends.

3, energy-conservation wide voltage stabilizing alternating current-direct current black and white television set according to claim 1, it is characterized in that the ground end of sound accompaniment circuit III and the negative pole of storage battery skewer seat C link, the other end links by the upper end of AC/DC K switch 2 and the secondary centre tap (4) of full wave rectified transformer B by resistance R 2, R1 again.