CN1187956C - Apparatus using double focusing type fly-back transformer - Google Patents
Apparatus using double focusing type fly-back transformer Download PDFInfo
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Abstract
The present invention discloses an apparatus using double focusing type fly-back transformer. A top bleeder type is adopted in drawing the focus voltage of the fly-back transformer instead of the conventional neutral point type, and the double patterns of the focus resistors are separated from each other instead of the conventional common connections to the ground on the substrate of the focus unit part. Further, one or more of the separately installed focus resistor patterns is used as a feedback line together with the bleeder resistor, thereby drastically reducing the size of the bleeder resistor.
Description
Technical field
The present invention relates to a kind of device that uses double focusing type fly-back transformer.More particularly, the present invention relates to a kind of device that uses double focusing type fly-back transformer, wherein in the focus voltage that extracts feedback transformer, adopted the summit to divide die mould rather than neutral point type, the digraph shape that focuses on resistance is separated from each other rather than common common ground on the substrate FUB of focusing unit part, with one or more focusing resistance patterns of installing that separate together are used as feedback line with divider resistances, thereby reduced the size of divider resistance substrate widely.
Background technology
Fig. 1 is the perspective view that shows the profile of general double focusing type fly-back transformer.With reference to figure 1, generally in television set and computer monitor, use double focusing type fly-back transformer to provide anode voltage, double focusing voltage and screen voltage.In the double focusing type fly-back transformer 10 of Fig. 1, identifying code VOLH indication is used for the regulator potentiometer of horizontal focusing voltage, and the VOLV indication is used for the regulator potentiometer of vertical focusing voltage and the regulator potentiometer that the VOLG indication is used for screen voltage.In addition, identifying code CA0 indication is used for supplying with to the monitor anode cable of anode voltage, CA1, and CA2 and CA3 indication are to each grid supply level focus voltage of electron gun, the cable of vertical focusing voltage and screen voltage.Identifying code CAP indicates anode cap.
Fig. 2 is the circuit diagram that shows the circuit composition of the device that uses conventional double focusing type fly-back transformer.With reference to figure 2, in the double focusing type fly-back transformer 10 of routine, horizontal output part 5 comprises transistor Q1, damper diode DD and tuning capacitor CT.Horizontal output part 5 is according to the horizontal-drive signal operation, in the elementary winding L 1 generation pulse of feedback transformer.Secondary winding L11, rectifier diode D11-D16 and high-voltage capacitor C11 are with pulse type AC boost in voltage, rectification and the planarization of elementary winding L 1.The feedback transformer of operation is supplied with anode voltage by this way, and partly supplies with double focusing voltage and screen voltage by focusing unit.
Double focusing type fly-back transformer 10 comprises: the one end is connected in the output of horizontal output part 5, and its other end is connected in power supply B+, is used for obtaining by the LC-resonance of horizontal output part 5 the elementary winding L 1 of collector electrode pulse; Be used for secondary winding L11-L16 according to the ratio of winding rising pulse type AC voltage of they and elementary winding L 1; The rectifier diode D11-D16 that is used for the AC voltage of rectification secondary winding; The high-voltage capacitor C11 that is used for the dc voltage after the planarization rectification; Be used for the discharge of sensing CPT (color picture tube) and the divider resistance BR1 of the high pressure fluctuations of (set-offstatus) in off position; Focusing unit part with the neutral point that is used to utilize secondary winding L11-L16 (above D12) supply two focus voltages (double focusing voltage) and screen voltage.In addition, iron core FC is arranged between elementary winding L 1 and the secondary winding L11-L16.
The focusing unit part is used on greater than 17 inches big monitor.This part is the double focusing unit that is used to provide horizontal focusing voltage and vertical focusing voltage, and comprises: be used for fixing and first variable resistor R11 and the VR11 that is connected in series to horizontal focusing voltage output end FH output horizontal focusing voltage; Be used for fixing and the second adjustable resistance R12 and the VR12 that are connected in series to vertical focusing voltage output end FV output vertical focusing voltage; And the tie point that is connected resistance R 11 and R12 is connected between the pin # 11 with ground connection first, is used for the 3rd variable resistor VR13 to screen voltage output G2 output screen voltage.
In addition, feedback transformer 10 also comprises: be used to export parabolic pulses 300V
P-PTo the coupling capacitor CP of vertical focusing voltage (approximately 4.5KV-8.5KV), vertical voltage is exported by vertical focusing voltage output end FV (providing from system by the second connection pin #12); With the by-pass capacitor CB that is used for the AC noise component(s) such as parabolic pulses that is included in the horizontal focusing voltage of exporting by horizontal focusing voltage output end FH is switched to earth point.
In addition, for the voltage that will compensate according to high pressure fluctuations feedback after in the output of feedback transformer, detecting high pressure fluctuations to power supply B+, the side of system comprises: be connected capacitor C13 between earth point and the high-voltage capacitor C11 by the 4th connection pin # 14; Connect pin # 13 by the 3rd and be connected capacitor C12 between capacitor C11 and the divider resistance BR1; Initial voltage setting section 12 is used for carrying out dividing potential drop by divider resistance BR1 and its internal resistance antianode voltage (high voltage); With high voltage stabilization circuit part 11, be used for coming offset supply B+ by the voltage of feedback initial voltage setting section 12.
Fig. 3 shows the printed pattern on the substrate FUB of focusing unit part of the double focusing type fly-back transformer that is formed on Fig. 2.With reference to figure 3, the substrate FUB of conventional focusing unit part is a potsherd, and resistance PF is formed on the potsherd.Here, the contact of identifying code PCA1-PCA3 indication cable CA1-CA3.Identifying code PVOLH, PVOLV and PVOLG indication regulator potentiometer VOLH, the potentiometer contact of VOLV and VOLG.The capacitor contact of identifying code PCP and PCB indication coupling capacitor CP and by-pass capacitor CB.Identifying code PD12 indication is connected to the diode contact of diode D12, and P11 indication first connects the contact of pin.
Fig. 4 shows the profile of the divider resistance BR1 of Fig. 2.With reference to figure 4, conventional divider resistance BR1 has the size of about 15mm * 50mm, and forms by form printed pattern BRP1 on ceramic bases BRB1.Identifying code L13 indication is connected to the lead-in wire of the 3rd connection pin # 13, and the LPH indication is connected to the lead-in wire of the contact PH of anode voltage outlet line.Feedback transformer contains the divider resistance BR1 and the high-voltage capacitor C11 of same size.Feedback transformer also comprises FUB and by-pass capacitor CB and is connected to the coupling capacitor CP of FUB.
The operation of the conventional double focusing feedback transformer of the above-mentioned structure of explanation now.
At first, with reference to figure 2, comprise horizontal output transistor Q1, the horizontal output part 5 of damper diode DD and tuning capacitor CT is operated in the scope of 15-100KHz according to horizontal-drive signal.The elementary winding L 1 that is connected between the output of horizontal output part 5 produces pulse type AC voltage.Raise these AC voltages of elementary winding L 1 of secondary winding L11-L16 are the AC voltage commutation dc voltage then.Next, high-voltage capacitor C11 makes the dc voltage planarization, thereby the dc voltage of about 26KV is outputed to the anode tap of monitor or other image receiving tube by anode voltage output HV.
At this moment, the level of the voltage of supplying with from the neutral point (above D12) of secondary winding L11-L16 is that ratio of winding by secondary winding and elementary winding determines.First and second variable resistor VR11 that are connected in parallel and VR12 and the 3rd variable resistor VR13 that is connected in series are cut apart this voltage (approximately 10KV).By horizontal focusing voltage output end FH the horizontal focusing voltage output that is adjusted to the rated voltage of about 4.5-8.5KV by the first variable resistor VR11.In addition, by vertical focusing voltage output end FV the vertical focusing voltage output that is adjusted to the rated voltage of about 4.5-8.5KV by the second adjustable resistance VR12.Also by screen voltage output G2 the screen voltage output that is adjusted to the rated voltage of about 0.2-1.2KV by the 3rd variable resistor VR13.
In order to compensate the high-tension undulate quantity of supplying with from feedback transformer, system comprises initial voltage setting section 12 and high pressure stabilization circuit part 11.In initial voltage setting section 12, the divider resistance BR1 of 600M Ω and the resistance of initial voltage setting section 12 (resistance value with 100-250K Ω scope) are cut apart the high pressure of about 26KV.Therefore, the high pressure major part of 26KV is cut apart by divider resistance BR1 (600M Ω), and has only 5V to be cut apart by initial voltage setting section 12.Here, if high voltage fluctuates more than the 26KV, initial voltage setting section 12 detects more than the 5V so, and if high pressure fluctuations below 26KV, initial voltage setting section output is lower than 5V so.
High voltage stabilization circuit part 11 compares the detection voltage of initial voltage setting section 12 and an internal reference voltage (5V), so that detect high-tension fluctuation.Be higher than reference voltage if detect voltage, control so, power supply B+ is reduced.On the other hand,, control so, power supply B+ is improved if the voltage that detects is lower than reference voltage.For this purpose, that is,, bucking voltage is fed back to the power supply B+ of elementary winding L 1 for compensated waving.
In this conventional double focusing type fly-back transformer, detection feedback voltage is detected from the DC high voltage, and according to the voltage that detects, the decision bucking voltage is to offer system.For this purpose, need the independently feedback line that comprises divider resistance, and in system, need initial voltage setting section and high pressure stabilization circuit part (or IC) bucking voltage to be fed back to power supply B+ according to the voltage that detects.
But shown in Fig. 4, the divider resistance that constitutes the feedback line of double focusing type fly-back transformer is to be formed by the printed pattern BRP1 that is printed on the ceramic bases BRB1.Divider resistance must have big resistance value to stand voltage breakdown, therefore, must prolong the length of printed pattern, and can not print thick and fast.The substrate BRB1 that has formed the divider resistance of conventional feedback transformer on it becomes very long, so it has occupied very big area in transformer.As a result, increase the volume of transformer, and therefore improved cost, can not realize its miniaturization.Thereby the increase of product price is debatable.
Summary of the invention
The present invention is the defective that will overcome above-mentioned prior art.
Therefore, an object of the present invention is to provide a kind of device that uses double focusing type fly-back transformer, wherein reduced the size of the substrate of divider resistance widely.
Another object of the present invention is that a kind of device that uses double focusing type fly-back transformer will be provided, and has wherein adopted the summit to divide die mould rather than conventional neutral point type in the extraction of the focus voltage of feedback transformer.
A further object of the present invention is that a kind of device that uses double focusing type fly-back transformer will be provided, the digraph shape that wherein focuses on resistance is the earth point on the substrate FUB that is connected to the focusing unit part jointly that be separated from each other rather than routine, and focusing resistance pattern and divider resistance that one or more separation are installed together are used as feedback line, thereby make divider resistance can cut apart the output voltage of anode voltage output, focus on the voltage dividing function that resistance pattern can be carried out divider resistance with making, reduced the size of divider resistance thus widely.
State in the purpose in realization, use double focusing type fly-back transformer according to the present invention provides horizontal focusing voltage to the CRT of television set, monitor or similar devices, and the device of vertical focusing voltage and screen voltage comprises: the horizontal output part of horizontal-drive signal that is used for providing to elementary winding the vision signal of impulse form; Be used for a plurality of secondary winding according to the ratio of winding boosted voltage of secondary winding and elementary winding; Be used to the rectifier diode of output AC voltage commutation of the rising of secondary winding; The high voltage capacitor that is used for the output voltage of planarization secondary winding; Be used for providing anode output end rectification and output voltage planarization to CRT; Be used for the compensating circuit device of the DC high voltage fluctuation of sensing anode output end with the compensating error value; By the divider resistance that the printed pattern that forms in the substrate constitutes, its end is connected in the anode voltage output; With form in the substrate by being printed on, and be connected the other end of divider resistance and the focusing unit part between the compensating circuit device, thereby can cut apart the DC high voltage of anode output end by divider resistance and focusing unit part, to reduce required resistance value and divider resistance value, so that can reduce the printed substrates size of divider resistance.
According to the present invention, also provide a kind of double focusing type fly-back transformer that uses to provide horizontal focusing voltage with CRT to television set or monitor, the device of vertical focusing voltage and screen voltage comprises: the horizontal output part of horizontal-drive signal that is used for providing to elementary winding the vision signal of impulse form; Be used for carrying out a plurality of secondary winding that voltage raises according to the ratio of winding of they and described elementary winding; The a plurality of rectifier diodes that are used for the rising output AC voltage of the described secondary winding of rectification; The high voltage capacitor that is used for the output voltage of the described secondary winding of planarization; Be used for supplying with anode output end rectification and output voltage planarization to CRT; Be used for the compensating circuit device of the DC high voltage fluctuation of the described anode output end of sensing with the compensating error value; Comprise being formed on a suprabasil printed pattern, the one end is connected to the divider resistance of described anode voltage output; And being printed on the other end that forms in the described substrate and be connected described divider resistance and the focusing unit part between the described compensating circuit device, described focusing unit partly comprises: first variable resistor that is used to provide horizontal focusing voltage; Be used to provide the second adjustable resistance of vertical focusing voltage; With the 3rd variable resistor that is used to provide screen voltage; Wherein, one or more variable resistors are connected in series between the other end and described compensating circuit device of described divider resistance, described thus divider resistance and described focusing unit are partly cut apart the DC high voltage of described anode output end to reduce required resistance value and divider resistance value, so that can reduce the size of the printed substrates of described divider resistance.
Description of drawings
By detailed to the preferred embodiments of the present invention with reference to the accompanying drawings explanation, will clearer understanding be arranged to above-mentioned purpose of the present invention and other advantage, wherein:
Fig. 1 is the perspective view of the profile of general double focusing type fly-back transformer;
Fig. 2 is the circuit diagram that shows the circuit structure of the conventional equipment that uses double focusing type fly-back transformer;
Fig. 3 shows the printed pattern on the substrate FUB of focusing unit part of the double focusing type fly-back transformer that is formed on Fig. 2;
Fig. 4 shows the profile of the divider resistance BR1 of Fig. 2;
Fig. 5 is the circuit diagram of demonstration according to the circuit structure of the device of use double focusing type fly-back transformer of the present invention;
Fig. 6 shows the printed pattern on the substrate FUB of focusing unit part of the double focusing type fly-back transformer that is formed on Fig. 5;
Fig. 7 shows the profile of the divider resistance BR1 of Fig. 5; With
Fig. 8 is the cutaway view according to the key component of the internal structure of double focusing type fly-back transformer of the present invention.
Embodiment
Fig. 5 is the circuit diagram of demonstration according to the circuit structure of the device of use double focusing type fly-back transformer of the present invention.With reference to figure 5, use the device of double focusing type fly-back transformer to comprise horizontal output part 5, feedback transformer 20 and compensating circuit device.
One end of the elementary winding L 1 of feedback transformer 20 is connected in the output of horizontal output part 5, and the other end of elementary winding L 1 is connected in power supply B+.
In addition, double focusing type fly-back transformer 20 according to the present invention comprises: the elementary winding L 1 that is used for obtaining by the LC resonance of horizontal output part 5 the collector electrode pulse; Be used for a plurality of secondary winding L21-L26 according to the ratio of winding boosted voltage of secondary winding and elementary winding L 1; Be used to the rectifier diode D21-D26 of the AC voltage commutation of secondary winding L21-L26; Be used for the planarization dc voltage it is outputed to the high voltage capacitor C21 of anode voltage output HV; Be used for providing horizontal focusing voltage by level and vertical focusing voltage output end FH and FV and screen voltage output G2, the substrate FUB of the focusing unit part with resistor printed pattern of vertical focusing voltage and screen voltage is used for anode voltage output HV is connected to initial voltage setting section 12 and high voltage stabilization circuit part 11 so that compensate the feedback line of the fluctuation of dc voltage; By the divider resistance BR2 that printed pattern constitutes, the one end is connected in DC anode voltage output HV; Provide with the graphic form on the substrate FUB that is printed on focusing unit part, and the other end (some A) that is connected divider resistance BR2 is connected the first variable resistor VR21 between the pin # 11, the first connection pin # 11 ground connection with first; With provide with the graphic form on the substrate FUB that is printed on focusing unit part, and be connected the 3rd the second adjustable resistance VR22 that connects between pin # 13 and the tie point (putting A) (between the divider resistance BR2 and the first variable resistor VR21).
The compensating circuit that is used for the compensating error value partly detects the DC high pressure fluctuations, and comprises: initial voltage setting section and high voltage stabilisation part.
Focusing unit partly comprises: the first variable resistor VR21 that is used to provide horizontal focusing voltage; Be used to provide the second adjustable resistance VR22 of vertical focusing voltage; With the 3rd variable resistor VR23 that is used to provide screen voltage.
In addition, the feedback line of double focusing type fly-back transformer is connected between the initial voltage setting section of anode voltage output and system side and detects bucking voltage, so that the stabilisation high voltage.This feedback line can constitute with the 3rd divider resistance BR2 and the second adjustable resistance VR22 that is connected between the pin # 13 that is connected to high voltage stabilization circuit part 11 by being connected in series in anode voltage output HV.Or it can constitute with the 3rd divider resistance BR2 and the first variable resistor VR21 that is connected between the pin # 13 that is connected to high voltage stabilization circuit part 11 by being connected in series in anode voltage output HV.
Double focusing type fly-back transformer also comprises: the horizontal focusing voltage output end FH that is connected in the first variable resistor VR21; Be connected horizontal focusing voltage output end FH and the first by-pass capacitor CB that is connected between the pin # 11 that is connected to system earth point, be used to make the AC noise grounding shunt such as parabolic pulses; Be connected in the vertical focusing voltage output end FV of the second adjustable resistance VR22; And be connected vertical focusing voltage output end FV and be connected coupling capacitor CP between the pin # 12 with second, be used to receive parabolic pulses from system.Horizontal focusing voltage output end FH is connected in the first variable resistor VR21, and vertical focusing voltage output end FV is connected in the second adjustable resistance VR22.
Double focusing type fly-back transformer also comprises: the other end that is connected in series in the first variable resistor VR21 is connected between the pin # 11 with first, and also is connected to the 3rd variable resistor VR23 of screen voltage output G2, is used to provide screen voltage.The 3rd variable resistor VR23 can be connected between the pin # 11 with first by the other end that it is connected in series in the first variable resistor VR21, and also it is connected to screen voltage output G2 and forms, and is used to provide screen voltage.
According to above-mentioned structure, one or more variable resistors are connected in series between the other end and compensating circuit device of divider resistance BR2, and within the focusing unit part.
Meanwhile, connect pin # 11, #12, #13 and #14 are connected to system.That is, identifying code # 11 indication is connected to the connection pin of earth point, and the #12 indication is connected to the connection pin that is used to receive from the parabolic pulses terminals of system.Identifying code # 13 indicates the pin that is connected that is connected to high voltage stabilization circuit part 11 and initial voltage setting section 12 with #14.Code ABL representative is used for regulating automatically in system the auto brightness restriction of brightness.
Fig. 6 shows the printed pattern on the substrate FUB of focusing unit part of the double focusing type fly-back transformer that is formed on Fig. 5.With reference to figure 6, the substrate FUB of focusing unit part makes with pottery, and resistance is formed on this potsherd with printed pattern PF form.Here, identifying code PCA1-PCA3 indication is connected to the tie point of cable CA1-CA3.Identifying code PVOLH, PVOLV and PVOLG indication are connected to regulator potentiometer VOLH, the potentiometer tie point of VOLV and VOLG.Identifying code PCP and PCB indication are connected to the capacitor tie point of coupling capacitor CP and by-pass capacitor CB.Identifying code PBR2 indication is connected to the divider resistance tie point of divider resistance BR2.Identifying code P11 indication is connected to the tie point of the first connection pin #11.Identifying code P13 indication is connected to the tie point of the 3rd connection pin #13.As shown in Figure 6, P11 and P13 are separated from each other in the printed pattern PF of the substrate FUB of focusing unit part.
Fig. 7 shows the profile of the divider resistance BR2 of Fig. 5.With reference to figure 7, divider resistance BR2 of the present invention provides with the printed pattern BRP2 form on the little ceramic bases BRB2.Identifying code LA indication is connected to the lead-in wire of the tie point A between the first variable resistor VR21 and the second adjustable resistance VR22.Identifying code LPH indication is connected to the lead-in wire of the tie point PH of anode voltage outlet line.
More particularly, be installed in 1/4 the size that divider resistance BR2 in the feedback transformer 20 have 1/2 and focusing unit part substrate FUB width of focusing unit part substrate FUB length.That is, the width * length of divider resistance BR2 substrate approximately is 8mm * 30mm.
Fig. 8 is the cutaway view of demonstration according to the key component of the internal structure of double focusing type fly-back transformer of the present invention.In Fig. 8, show printed pattern resistance and the voltage-regulation potentiometer VOLH of the substrate FUB of focusing unit part, the relation of VOLV and VOLG.
The operation of the device of the use double focusing type fly-back transformer of the present invention of the above-mentioned structure of explanation now.
At first with reference to figure 5, horizontal output part 5 is operated according to horizontal-drive signal HSS.According to horizontal-drive signal HSS, horizontal output transistor Q1 is switch repeatedly.According to the operation of horizontal output transistor Q1, between tuning capacitor CT and elementary winding L 1, produce resonance.LC resonance causes generation pulse type AC voltage in elementary winding L 1.According to the ratio of winding of secondary winding and elementary winding, the raise AC voltage of elementary winding L 1 of secondary winding L21-L26.A plurality of rectifier diode D21-D26 are the AC voltage commutation that raises dc voltage.
High voltage after the high-voltage capacitor C21 planarization rectification (approximately 26KV) is to be provided to the anode tap of monitor or similar device by anode voltage output HV.In addition, the high voltage after the rectification is divided into focusing unit part voltage and divider resistance BR2 voltage.The voltage of cutting apart is by horizontal focusing voltage output end FH, and vertical focusing voltage output end FV and screen voltage output G2 provide as double focusing voltage and screen voltage.High voltage after the rectification is also cut apart by printed pattern resistance VR22 and the R22 of divider resistance BR2 and focusing unit part substrate FUB, so that connect the initial voltage setting section 12 that pin # 13 is provided to system by the 3rd.
Next, the voltage (detection voltage) that will cut apart of high voltage stabilization circuit part 11 and internal reference voltage (5V) are relatively.Then the Voltage Feedback that will compensate owing to high pressure fluctuations is arrived the power supply B+ of elementary winding L 1, thereby stablized high voltage.Here omitted explanation, because they are to carry out in the mode of routine to the operation of initial voltage setting section 12 and high voltage stabilization circuit part 11.
Now explanation is connected in the function of the double focusing cell mesh of divider resistance BR2.Focusing unit partly has two basic functions, and first function provides double focusing voltage (horizontal focusing voltage and vertical focusing voltage) and screen voltage.Second function is to utilize the high voltage dividing function of feedback line (this voltage dividing function is only carried out by divider resistance in the past).That is, the anode voltage output is connected in initial voltage setting section 12 and high voltage stabilization circuit part 11, thereby the printed pattern resistance and the divider resistance BR2 of focusing unit part together can carry out the function of cutting apart the anode output voltage.Below will describe this two functions in detail.
First function at first is described.That is, at first by divider resistance BR2, the first variable resistor VR21, resistance R 21 and the 3rd variable resistor VR23 are cut apart the high voltage that is provided to anode tap from anode voltage output HV.The voltage that is adjusted to required level by the first variable resistor VR21 is exported by horizontal focusing voltage output end FH, thereby makes that can carry out horizontal focusing regulates.The voltage that is adjusted to required level by the 3rd variable resistor VR23 is by screen voltage output G2 output, thereby makes and can carry out brightness regulation.
Then, divider resistance BR2, the second adjustable resistance VR22 and initial voltage setting section 12 are cut apart the high voltage that is provided to anode tap from anode voltage output HV.The voltage that is adjusted to required level by the second adjustable resistance VR22 is exported by vertical focusing voltage output end FV, thereby makes that can carry out vertical focusing regulates.
Second function relates to a kind of technological concept.The function that resistance that provides with the printed pattern PF form on the focusing unit part substrate FUB and divider resistance BR2 bring into play feedback line jointly (the feedback line function is only to be carried out by divider resistance usually).Therefore, the size of divider resistance BR2 substrate can be reduced greatly, this fact can be confirmed by the conventional divider resistance BR1 of Fig. 4 is compared with the divider resistance BR2 of the present invention of Fig. 7.To describe this second function below in detail.
Make divider resistance BR2, the second adjustable resistance VR22 of fixed resistance R22 and focusing unit part forms the feedback line that leads to initial voltage setting section 12 and high voltage stabilization circuit part 11.Therefore, divider resistance BR2, the second adjustable resistance VR22, the internal resistance of fixed resistance R22 and initial voltage setting section 12 is cut apart high voltage (anode voltage).The voltage of cutting apart that high voltage stabilization circuit part 11 detects from initial voltage setting section 12 check the high voltage fluctuation, and service voltage is with offset supply B+.
Under this condition, can handle the voltage of cutting apart of initial voltage setting section 12 if make high voltage stabilization circuit part 11, must be divided into low-voltage to high voltage by initial voltage setting section 12, make high voltage stabilization circuit part 11 can handle it from the anode voltage output.Therefore, divider resistance BR2, the second adjustable resistance VR22 and fixed resistance R22 have been cut apart high-tension major part.
As mentioned above, the fixed resistance R22 and the second adjustable resistance VR22 of Fig. 5 and 6 divider resistance BR2 and focusing unit part have been cut apart a large amount of high voltages.The dividing potential drop burden that the fixed resistance R22 of focusing unit part and the second adjustable resistance VR22 have alleviated divider resistance, thereby compare with the situation of only carrying out the dividing potential drop task by divider resistance of routine, the size of divider resistance BR2 substrate reduced widely.
With reference to figure 5, illustrate that specified anode voltage is the example of 26KV.At first, if the specified level synchronizing signal HSS of about 15-100KHz is input in the horizontal output part 5, the horizontal output transistor Q1 of horizontal output part so 5 is switch repeatedly.Therefore, because LC resonance takes place in the tuning capacitor CT of elementary winding L 1 and horizontal output part 5.As a result, because LC resonance produces AC voltage in the elementary winding L 1 of feedback transformer 20.Secondary winding L21-L26 is elevated to about 26KV to AC voltage according to the ratio of winding of secondary winding and elementary winding.Rectifier diode D21-D26 becomes the voltage commutation of these risings the dc voltage of 26KV.Under this condition, feedback transformer not only provides anode voltage, level and vertical focusing voltage and screen voltage, but also detect voltage fluctuation.According to the voltage that detects, offset supply B+.For this purpose, for system provides the voltage detecting feedback line, making it possible to provides voltage with stable nominal level.
Anode voltage supply process at first is described.High voltage capacitor C21 makes the dc voltage planarization of 26KV, becomes stable dc voltage, then, by anode voltage output HV this smooth dc voltage is provided to anode.
The supply process of double focusing voltage and screen voltage is described now.The divider resistance BR2 of 350M Ω is cut apart 16KV to the high voltage of 26KV.In addition, the about resistance VR21 of 480M Ω, R21 and VR23, and the resistance VR22 of 480M Ω and R22 formed the resistance value of about 240M Ω, and this resistance value is cut apart the voltage of about 10KV.Under this condition, utilize the first variable resistor VR21 of the regulator potentiometer VOLH adjusting focusing unit substrate FUB partly of Fig. 8, make the horizontal focusing voltage that outputs to horizontal focusing voltage output end FH become about 4.5-8.5KV.Then, utilize the second adjustable resistance VR22 of the regulator potentiometer VOLV adjusting focusing unit substrate FUB partly of Fig. 8, make the vertical focusing voltage that outputs to vertical focusing voltage output end FV become about 4.5-8.5KV.Next, utilize the 3rd variable resistor VR23 of the regulator potentiometer VOLG adjusting focusing unit substrate FUB partly of Fig. 8, make the screen voltage that outputs to screen voltage output G2 become 0.2-1.2KV.
The testing process of the high voltage fluctuation that feedback line carries out is described now.The divider resistance BR2 of 350M Ω tells 16KV to the high voltage of 26KV.Then, resistance VR22 and the R22 of 480M Ω tell about 10KV, and the initial voltage setting section 12 with internal resistance of about 100-250M Ω is divided into 5V to voltage.At high voltage is that rated voltage (for example, in the time of 26KV), realizes the voltage of 5V accurately.If high voltage is higher or lower than rated voltage, that is, if high voltage demonstrates fluctuation, initial voltage setting section 12 detected voltages will be higher or lower than 5V so.Therefore, high voltage stabilization circuit part 11 (for example, 5V) is compared detected voltage and internal reference voltage, to learn the high voltage fluctuation.Then, carry out FEEDBACK CONTROL with offset supply B+.
According to above-mentioned example, the technological concept of the size of the ceramic bases that can reduce divider resistance BR2 greatly will be described below.At first, can be reduced to 350M Ω to the resistance of divider resistance BR2 from common 600M Ω, the result has reduced the size of the substrate of divider resistance BR2.Secondly, the voltage level that divider resistance is told is reduced to 16KV from common 26KV, and the result has reduced required voltage breakdown level.Therefore, can print the printed pattern of divider resistance more intensively, can reduce the size of divider resistance substrate thus.
Double focusing type fly-back transformer according to the present invention uses in large-screen monitor, and therefore, as shown in Figure 6, the focusing unit circuit has digraph shape.That is, the digraph shape that level and vertical focusing need, and play the effect of divider resistance with the focusing resistance that the printed pattern form provides.Therefore, realize reducing of divider resistance size of foundation base, and thereby can reduce the cost of double focusing type fly-back transformer.
According to aforesaid the present invention, in the focus voltage that extracts feedback transformer, adopted the summit to divide die mould rather than conventional neutral point type, the digraph shape that focuses on resistance be separated from each other rather than the conventional substrate FUB that is connected to the focusing unit part jointly on earth point, and used focusing resistance pattern that one or more separation install and divider resistance together as feedback line, thereby reduced to print the size of divider resistance substrate greatly.
Therefore, in the present invention, (approximately 15mm * 50mm) is reduced to littler divider resistance substrate (about 8mm * 30mm) in conventional large-sized divider resistance substrate.Thereby having reduced the area occupied of double focusing type fly-back transformer, the result can reduce the cost of double focusing type fly-back transformer.
Top explanation only is a particular example of the present invention, therefore, can increase various change and transformation, and not break away from technical scope of the present invention.
Claims (2)
1. one kind is used double focusing type fly-back transformer to provide horizontal focusing voltage with the CRT to television set or monitor, and the device of vertical focusing voltage and screen voltage comprises:
Be used for providing the horizontal output part of horizontal-drive signal of the vision signal of impulse form to elementary winding;
Be used for carrying out a plurality of secondary winding that voltage raises according to the ratio of winding of they and described elementary winding;
The a plurality of rectifier diodes that are used for the rising output AC voltage of the described secondary winding of rectification;
The high voltage capacitor that is used for the output voltage of the described secondary winding of planarization;
Be used for supplying with anode output end rectification and output voltage planarization to CRT;
Be used for the compensating circuit device of the DC high voltage fluctuation of the described anode output end of sensing with the compensating error value;
Comprise being formed on a suprabasil printed pattern, the one end is connected to the divider resistance of described anode voltage output; With
Be printed on the other end that forms in the described substrate and be connected described divider resistance and the focusing unit part between the described compensating circuit device, described focusing unit partly comprises:
Be used to provide first variable resistor of horizontal focusing voltage;
Be used to provide the second adjustable resistance of vertical focusing voltage; With
Be used to provide the 3rd variable resistor of screen voltage;
Wherein, one or more variable resistors are connected in series between the other end and described compensating circuit device of described divider resistance, described thus divider resistance and described focusing unit are partly cut apart the DC high voltage of described anode output end to reduce required resistance value and divider resistance value, so that can reduce the size of the printed substrates of described divider resistance.
2. device according to claim 1, the described compensating circuit that wherein is used for the compensating error value partly detects the fluctuation of DC high voltage, and comprises initial voltage setting section and high voltage stabilisation part.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR9612/1998 | 1998-06-05 | ||
| KR9612/98 | 1998-06-05 | ||
| KR2019980009612U KR200250020Y1 (en) | 1997-08-20 | 1998-06-05 | Apparatus using double focusing type fiy-back transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1238638A CN1238638A (en) | 1999-12-15 |
| CN1187956C true CN1187956C (en) | 2005-02-02 |
Family
ID=19535124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991079353A Expired - Fee Related CN1187956C (en) | 1998-06-05 | 1999-06-03 | Apparatus using double focusing type fly-back transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1187956C (en) |
-
1999
- 1999-06-03 CN CNB991079353A patent/CN1187956C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1238638A (en) | 1999-12-15 |
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