CN1188979A - Display device with power interruption delay function - Google Patents
Display device with power interruption delay function Download PDFInfo
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- CN1188979A CN1188979A CN97116223A CN97116223A CN1188979A CN 1188979 A CN1188979 A CN 1188979A CN 97116223 A CN97116223 A CN 97116223A CN 97116223 A CN97116223 A CN 97116223A CN 1188979 A CN1188979 A CN 1188979A
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Abstract
A display device with a power interruption delay function, comprising a power interruption delay charging circuit for gradually lowering an input voltage to an horizontal/vertical processor constant voltage circuit when power supply to the display device is interrupted. According to the present invention, when power supply is resumed under the condition that a high voltage charged on a horizontal deflection coil and an S-correction capacitor is not sufficiently discharged after power interruption, the power interruption delay charging circuit can prevent a horizontal output transistor from being damaged due to an instantaneous surge current resulting from the high voltage being not discarged.
Description
In general, the present invention relates to a kind of display unit of using cathode ray tube, specifically, relate to a kind of display unit with power interruptions delay feature, wherein provide a power interruptions and postpone charging circuit, when being filled with high voltage on the horizontal deflection coil and the S-calibrating capacitor does not have under the situation of fully discharge power up after power interruptions, in order to prevent the horizontal output transistor since the temporary impact electric current of generation this moment be damaged.
Usually, horizontal deflecting circuit is by the power circuit power supply and by its operation of Controlled by Microcomputer.This deflection circuit is the basic element of character of display unit.
Fig. 1 is the schematic block diagram of structure of the horizontal deflecting circuit of expression common display device.In the figure, microcomputer of label 110 expressions, power circuit of 120 expressions, and horizontal deflecting circuit of 130 expressions.Power circuit 120 is applicable to that the city is exchanged (AC) input power converts direct current power to, so that provide required voltage to horizontal deflecting circuit 130 and microcomputer 110.
Fig. 2 is the detailed circuit diagram of the horizontal deflecting circuit 130 of common display device among Fig. 1.As shown in this Fig, current amplifier 136 comprises that an electric current with primary and secondary coil amplifies transformer T1 and a field-effect transistor FET1 who its gate terminal is connected to the secondary coil of described electric current amplification transformer T1.The primary coil that described electric current amplifies transformer T1 is connected to the output of PWM controller 135 with the one end through a capacitor, and its other end is connected to the earth potential end.Field-effect transistor FET1 also is connected to its drain electrode end one high voltage source B+, and its source terminal is connected to the collector terminal of an end and the horizontal output transistor T R of horizontal deflection coil H-DY simultaneously by a pulse transformer PT.The other end of horizontal deflection coil H-DY is connected to S-calibrating capacitor C
SAn end, the other end of this capacitor is connected to the earth potential end.
H/V processor constant voltage circuit 131 is connected to its input one voltage source V 1 and its output is connected to the input of H/V processor 132 and an end of a capacitor simultaneously, the earth potential end that the other end of this capacitor connects.Horizontal driver 133 comprises a field-effect transistor FET2 and the horizontal drive transformer T2 with primary and secondary coil, and its gate terminal of described field effect transistor FET2 is connected to H/V processor 132 1 outputs, and its source terminal is connected to the earth potential end.The primary coil of horizontal drive transformer T2 is connected to a voltage source V 2 with the one end by a resistor, and its other end is connected to the drain electrode end of field-effect transistor FET2.The secondary coil of horizontal drive transformer T2 is connected to the one end base terminal of horizontal output transistor T R in the horizontal output circuit 134 and its other end is connected to the earth potential end.The emitter of this horizontal output transistor T R is connected to the earth potential end.
To the work of the horizontal deflecting circuit 130 of common display device with said structure be described below.
When display unit was switched on power supply, PWM controller 135 was worked under the control of microcomputer 110, and output pwm signal is to current amplifier 136.In this current amplifier 136, response is from the pwm signal of PWM controller 135, and electric current amplifies transformer T1 and is energized the field-effect transistor FET1 that is connected with its secondary coil to drive.When field-effect transistor FET1 was driven, the high voltage of the high voltage source B+ that is connected from the drain electrode end with this field-effect transistor FET1 was transformed horizontal deflection coil H-DY and S-calibrating capacitor C by pulse transformer PT
SOn, so that will be to its charging.
In these cases, H/V processor 132 is exported the horizontal pulse signal of a square wave to horizontal driver 133 under the control of microcomputer 110.In horizontal driver 133, field-effect transistor FET2 conducting when the square-wave pulse signal from H/V processor 132 is high level is with stimulation level driving transformer T2.As a result, in the secondary coil of this horizontal drive transformer T2, induce a voltage, make horizontal output transistor T R in the horizontal output circuit 134 thus conducting.When horizontal output transistor T R conducting, it is at horizontal deflection coil H-DY and S-calibrating capacitor C
SOn the high voltage that fills be discharged into the earth potential end.
Thereafter, when from the square-wave pulse signal of H/V processor 132 when high level changes to low level, field-effect transistor FET2 and horizontal drive transformer T2 are turn-offed successively.As a result, from horizontal deflection coil H-DY and S-calibrating capacitor C
SHigh voltage no longer is released.
Subsequently, the high voltage from high voltage source B+ is switched to horizontal deflection coil H-DY and S-calibrating capacitor C by field-effect transistor FET1 in the current amplifier 136 and pulse transformer PT
SGo up so that to its charging.After this, repeat above-mentioned operation.
It should be noted that horizontal deflection coil H-DY is installed in the neck (not shown) of display unit, so that can be deflected a left side or right side according to the direction of electric current by coil H-DY from cathode ray tube electrons emitted bundle.
S-calibrating capacitor C
SApply a parabolic voltage to horizontal deflection coil H-DY, arrive the linearity on a left side and right side with the center of proofreading and correct screen.S-calibrating capacitor C
SAlso carry out the direct current interrupt function, flow through horizontal deflection coil H-DY to prevent direct current.
At the duration of work of display, if be applied to the power interruptions of this display, then because the interruption of the voltage V1 shown in Fig. 4 a makes H/V processor constant voltage circuit 131 no longer work.As a result, H/V processor 132 is also no longer worked.
Because H/V processor 132 is no longer worked, it no longer exports the pulse signal as Fig. 5 a, makes thus at horizontal deflection coil H-DY and S-calibrating capacitor C
SOn the high voltage that fills be not released.As a result, about+voltage of 120 to 160V maintains the node A of the collector terminal of horizontal output transistor T R.
In these cases, if be applied to the power up of display, then because the applying of voltage V1, H/V processor constant voltage circuit 131 is driven, so that start H/V processor 132.As a result, horizontal output transistor T R is activated.
At this moment, produce a high voltage in the collector terminal of horizontal output transistor T R with peak value very (approximately+1.5 to 1.8KV) instantaneously.As a result, the impulse current that is produced by this transient high voltage flows through the discharge loop that comprises horizontal output transistor T R rapidly, makes horizontal output transistor T R be damaged thus.
If the horizontal output transistor T R in the horizontal output circuit 134 is damaged, then on indicator screen with not executive level deflection, make a single line vertically appear at the centre of screen thus.As a result, the user can not discern the information that is presented on the screen.
In addition, because the short circuit that the damage of horizontal output transistor T R causes may make external equipment and circuit damage subsequently.
Therefore, make the present invention in view of the above problems, an object of the present invention is to provide a kind of display with power interruptions delay feature, wherein provide a power interruptions and postpone charging circuit, when being filled with high voltage on the horizontal deflection coil and the S-calibrating capacitor does not have under the situation of fully discharge power up after power interruptions, in order to prevent the horizontal output transistor since the temporary impact electric current of generation this moment be damaged.
According to the present invention, above-mentioned and other purposes can realize that it comprises a PDM keyer, is used for producing pulse-width signal under Controlled by Microcomputer by the display unit with power interruptions delay feature is provided; A current amplifier is used for electric current is amplified with the pulse-width signal of response from PDM keyer; A H/V processor is used for producing square-wave pulse signal under Controlled by Microcomputer; A horizontal driver is used to produce one and drives arteries and veins kind signal with the square-wave pulse signal of response from the H/V processor; A horizontal deflection coil that is used for the horizontal deflection electron beam; A S-calibrating capacitor is with the horizontal deflection coil center that is used to the to proofread and correct screen linearity to a left side and right side that is connected in series; A horizontal output circuit is used for filling energy on horizontal deflection coil and the S-calibrating capacitor and discharging energy on it, with response from the output signal of current amplifier with from the drive pulse signal of horizontal driver; A H/V processor constant voltage circuit is used for providing a constant voltage to described H/V processor; Postpone charging device with a power interruptions, when being provided to the power interruptions of display unit, be used for reducing gradually the input voltage that arrives H/V processor constant voltage circuit.
By following detailed and with reference to the accompanying drawings, above-mentioned and other characteristics of the present invention and advantage will become and be more readily understood.
Fig. 1 is the schematic block diagram of the horizontal deflecting circuit of explanation common display device;
Fig. 2 is the detailed circuit diagram of the horizontal deflecting circuit of common display device among Fig. 1;
Fig. 3 is the detailed circuit diagram of explanation according to the structure of the display unit with power interruptions delay feature of the present invention;
Fig. 4 a and 4b are that expression arrives the oscillogram that compares between the input of H/V processor constant voltage circuit among Fig. 2 and 3; With
Fig. 5 a and 5b are the oscillograms that compares between the output of H/V processor in presentation graphs 2 and 3.
Fig. 3 is the detailed circuit diagram of explanation according to the structure of the display unit with power interruptions delay feature of the present invention.Postpone the charging circuit 370 except basis the invention provides a power interruptions, the structure of this figure is identical with the structure of Fig. 2.Therefore, the identical identical parts of label indication, and omitted the detailed description relevant with it.
In common display unit, voltage source V 1 is directly connected to the input of H/V processor constant voltage circuit 131.Yet in display unit of the present invention, this voltage source V 1 postpones the input that charging circuit 370 is connected to H/V processor constant voltage circuit 131 by power interruptions.
Power interruptions postpones charging circuit 370 and comprises a reverse-voltage protection diode D1, and its anode is connected to voltage source V 1, and its negative electrode is connected to the input of H/V processor constant voltage circuit 131; With a polar capacitor C1, its positive pole is connected to the tie point of the input of the negative electrode of reverse-voltage protection diode D1 and H/V processor constant voltage circuit 131, and its negative pole is connected to the earth potential end.
The work that has according to the display unit of said structure of the present invention will describe in detail below.
When the power supply of display unit is switched on, from the high voltage of high voltage source B+ by the field-effect transistor FET1 in current amplifier 136 and pulse transformer PT to horizontal deflection coil and the charging of S-calibrating capacitor with then by the discharge loop discharge that comprises horizontal output transistor T R in the horizontal output circuit 134.As the description of being done with reference to figure 2, above-mentioned charging and discharge operation are repeated.
If be interrupted at its power supply of display unit duration of work, the power supply that then offers H/V processor constant voltage circuit 131 in the common display device is stopped immediately, shown in Fig. 4 a.Yet according to the present invention, a voltage that fills on polar capacitor C1 during the power supply power supply is applied to the input of H/V processor constant voltage circuit 131, and shown in Fig. 4 b, it is discharged simultaneously.As a result, H/V processor constant voltage circuit 131 does not stop immediately to 132 power supplies of H/V processor.
It should be noted that; reverse-voltage protection diode D1 is connected between power supply V1 and the H/V processor constant voltage circuit 131 with series system, does not realize protection to power supply to voltage source V 1 discharge by making in the charging voltage on the polar capacitor under the power interruptions state.
Because the charging voltage on polar capacitor C1 is offered H/V processor constant voltage circuit 131 constantly and is released fully up to it, do not interrupted immediately so be applied to the voltage of H/V processor 132.Therefore, H/V processor 132 is exported horizontal pulse continuously at preset time in the cycle, shown in Fig. 5 b.
The continuous impulse output time of H/V processor 132 is according to determining the discharge time of polar capacitor C1.As a result, the continuous impulse output time of H/V processor 132 can change by the discharge time of adjusting this polar capacitor C1.
When the output pulse from H/V processor 132 maintains one can continue to drive the high-voltage level of the field-effect transistor FET2 in the horizontal driver 133 time, horizontal drive transformer T2 is energized continuously to induce a voltage on the level coil secondarily, makes that thus the horizontal output transistor T R in the horizontal output circuit 134 maintains its driving condition.Therefore, at horizontal deflection coil H-DY and S-calibrating capacitor C
SOn the high voltage that fills can be discharged fully.That is, at horizontal deflection coil H-DY and S-calibrating capacitor C
SOn high-tension discharge time of filling be enough.
As apparent from foregoing description, according to the present invention, power interruptions postpones the input that charging circuit is provided at the H/V processor constant voltage circuit in the display unit.This power interruptions postpone charging circuit can prevent the horizontal output transistor after the power interruptions during when power up owing to the moment impact electric current is damaged.In addition, this power interruptions delay charging circuit can prevent that external equipment and circuit from being damaged in succession owing to the transistorized damage of horizontal output.
Though, the preferred embodiments of the present invention are described for illustrative purposes, but those skilled in the art will be appreciated that it is made various improvement, interpolation and replacement all is possible, and does not break away from the scope and spirit of the present invention that limit as claims.
Claims (2)
1. display unit with power interruptions delay feature comprises:
A PDM keyer is used for producing pulse-width signal under Controlled by Microcomputer;
A current amplifier is used for electric current is amplified with the pulse-width signal of response from PDM keyer;
A H/V processor is used for producing square-wave pulse signal under described Controlled by Microcomputer;
A horizontal driver is used to produce one and drives arteries and veins kind signal with the square-wave pulse signal of response from described H/V processor;
A horizontal deflection coil that is used for the horizontal deflection electron beam;
A S-calibrating capacitor is with the horizontal deflection coil center that is used to the to proofread and correct screen linearity to a left side and right side that is connected in series;
A horizontal output circuit is used for filling energy on described horizontal deflection coil and the S-calibrating capacitor and discharging energy on it, with response from the output signal of described current amplifier with from the drive pulse signal of described horizontal driver;
A H/V processor constant voltage circuit is used for providing a constant voltage to described H/V processor; With
A power interruptions postpones charging device, is used for reducing gradually when being provided to the power interruptions of display unit the input voltage that arrives described H/V processor constant voltage circuit.
2. according to the display unit with power interruptions delay feature of claim 1, wherein said power interruptions postpones charging device and comprises:
A polar capacitor is used for carrying out charge function and carries out discharging function when the power supply that is provided to this display unit is interrupted when power supply is applied on this display unit; With
A diode that is connected with described polar capacitor is used for preventing that the voltage that fills on the described polar capacitor is discharged into a power circuit when being provided to the power interruptions of display unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97116223A CN1188979A (en) | 1996-08-30 | 1997-08-28 | Display device with power interruption delay function |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR37143/96 | 1996-08-30 | ||
| CN97116223A CN1188979A (en) | 1996-08-30 | 1997-08-28 | Display device with power interruption delay function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1188979A true CN1188979A (en) | 1998-07-29 |
Family
ID=5173703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97116223A Pending CN1188979A (en) | 1996-08-30 | 1997-08-28 | Display device with power interruption delay function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1188979A (en) |
-
1997
- 1997-08-28 CN CN97116223A patent/CN1188979A/en active Pending
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