CN1158682A - Power supply synchronization and appts. - Google Patents
Power supply synchronization and appts. Download PDFInfo
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- CN1158682A CN1158682A CN 95195198 CN95195198A CN1158682A CN 1158682 A CN1158682 A CN 1158682A CN 95195198 CN95195198 CN 95195198 CN 95195198 A CN95195198 A CN 95195198A CN 1158682 A CN1158682 A CN 1158682A
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Abstract
A power supply is synchronized to a repetition frequency of an addressing of lines in a multiples rate line addressing circuit. The power supply operates satisfactorily if switched within a prescribed frequency range. The switching frequency of the power supply is equal to the repetition frequency divided by an integer larger than zero. The integer is detemined such that the switching frequency of the power supply occurs within the prescribed frequency range for all repetition frequencies of the addressing of the lines.
Description
The present invention relates to be used for capable addressing repetition rate synchronous a kind of method, device and the control circuit thereof of power supply with the row addressing circuit, this method includes step: produce the wink triggering signal time section (moment) with the triggering signal repetition rate that equates with row addressing repetition rate; Determine one greater than zero integer according to the repetition rate that triggers; And respond this section to produce wink in control time section in wink in triggered time so that determine the switching frequency of power supply, this in wink in control time the repetition rate of section be that this triggering signal repetition rate is divided by this integer.
Be used for power supply is carried out the system that synchronous such method and control circuit can be used for comprising image display apparatus and be applicable to the multiple rate scanning circuit of different scanning rates display image, as at computer monitor.Such power supply can be used to other circuit to display system to be provided stable voltage or generates an anode voltage for graphics device.
Among the visible U.S. Pat-A-4516169 of this synchro source for the graphics monitor of multiple scan frequency.The horizontal deflecting circuit that this known display system is described can operate in two alternative Horizontal offset frequencies.A Switching Power Supply, switch are operated under the preferred switching frequency with selected Horizontal offset Frequency Synchronization, and do not rely in two Horizontal offset frequencies any one.Desirable is the switching process that prevents to see element in the Switching Power Supply with the simultaneous operation of Switching Power Supply on the picture tube of display system.An embodiment shown in this known display system can operate with two kinds of different Horizontal offset frequencies: second Horizontal offset frequency 31.5KHZ is the twice of first Horizontal offset frequency 15.75KHZ.This Switching Power Supply is to be used for two Horizontal offset frequencies with the 15.75KHZ operation of first horizontal frequency.The shortcoming of this known display system is, the fixed switching frequency that is synchronized with the Switching Power Supply of two Horizontal offset frequencies is that the integral multiple of fixedly switching frequency just may in each of Horizontal offset frequency only.If require the display system can be not show that for the reveal competence deflection frequency of integral multiple that is applicable to the fixed frequency that Switching Power Supply is switched then this known system is with powerless.This situation is just arranged in computer monitor, and its Horizontal offset frequency can be respectively, for example 35.2,37.8,48,56,64,77.1 or 81.1KHZ.
An object of the present invention is Switching Power Supply is synchronously switched to the large-scale capable addressing frequency that its value belongs to various capable addressing frequencies, and do not need the additional any condition of row addressing frequency.
The first string according to the present invention is characterised in that, in predetermined frequency range, wink in control time the repetition rate of section can be assumed to several values; Its feature also is the step that this integer is determined is produced such integer, and it has satisfied the divisor of trigger repetition rate to this integer, be provided in this scheduled frequency range wink in control time section repetition rate.
Alternative plan of the present invention provides the display system by claim 5 definition.
Third party's case of the present invention provides the control circuit by claim 7 definition.
Cubic case of the present invention provides the device that is used for a power supply is synchronized with the capable addressing repetition rate of a capable addressing circuit by claim 8 definition.
The various advantages of embodiments of the invention are defined by dependent claims.
A display system comprises an image display apparatus, a many speed row addressing circuit and a Switching Power Supply with different sweep speed displayed image.This row addressing circuit causes the scanning of the line position on image display apparatus.These row have a capable addressing repetition rate (will be known as line frequency) relevant with different scanning frequencys.This row addressing circuit can be a horizontal-deflection circuit, and the sort of as the scanning that is used for common picture tube maybe can be as the row/point selection circuit that uses in matrix shows.Section had of the line frequency of equaling and triggered repetition rate when producing wink in triggered time.The switching frequency of power supply be by wink in control time section determined, this in wink time the repetition rate that has of section be by wink in triggered time section repetition rate removed by a integer and the frequency that obtains greater than zero.The determining of this integer makes the repetition rate of this section appear within the predetermined frequency range in wink in control time.In this way, the operation of power supply is synchronized with wink in triggered time section, and carries out with a frequency in predetermined frequency range.Power supply will make its operation in predetermined switching frequency scope any problem not occur in design.
If with hardware circuit produce to trigger and wink in control time section, then section just can be associated with the wink time section of signal change level on it these in wink time.If the triggering that computer generates and wink in control time section, then section can also be the signal that changes level these in wink time, as one of expression definite wink time section value.
In the embodiment according to a method of the present invention, its feature is shown in claim 2, if line frequency appears within the predetermined frequency range of mains switch frequency, then the integer of Chan Shenging will be 1.In this case, first advantage is that the switching frequency of power supply equals line frequency, thereby makes the switching within each line period of element of power supply only occur once.If the switching frequency of power supply is an integral multiple of line frequency, will cause frequent interference for display unit.If situation especially like this when power supply was used to produce the anode voltage of picture tube.Second advantage is if line frequency is still appeared within the predetermined frequency range by a mains switch frequency that integer removed and produced greater than 1, just not remove this line frequency.As an example, this line frequency is 45KHZ if predetermined frequency range comprises from the frequency range of 15KHZ-60KHZ, and this power supply will switch with 45KHZ rather than with the frequency of 30KHZ or 15KHZ.The operation of power supply in this manner will the most effectively and will produce stable as far as possible output voltage.
In according to one embodiment of the method for the invention, its feature is shown in claim 3, and line frequency is higher than the highest frequency within predetermined frequency range.Then produce this integer, so that obtain the high as far as possible switching frequency within predetermined frequency range.Its advantage is, the power supply operation the most effectively and also will produce stable as far as possible output voltage.
The feature of a preferred embodiment of the method according to this invention is by shown in the claim 4.If wink in triggered time, section was not the interim appearance of forbidding in previous activity, then should wink in triggered time section produce one and forbid the phase with certain duration, and wink in triggered time section produce relevant wink in control time section, be used for Switching Power Supply.This duration is corresponding to the highest frequency within the predetermined frequency range.If wink in triggered time, section had a repetition rate within predetermined frequency range, then section will trigger one and forbid the phase each in wink in triggered time, and before next wink in triggered time section appearance, and this forbids that the phase is with the right and wrong activity.In each wink in a triggered time section generation wink in control time section, so that acquisition equals the switching frequency of the power supply of line frequency.If wink in triggered time, section had the repetition rate that is higher than the highest frequency in scheduled frequency range, then should wink time section will continue, after appearing at certain duration of forbidding the phase first wink in triggered time section trigger the next one and forbid till phase and next wink in the control time section.In this way, the switching frequency of power supply appears within the predetermined frequency range, and high as far as possible frequency is arranged.
According to the feature of the preferred embodiment of a display system of the present invention shown in claim 6.The multivibrator of a not reproducible triggering is triggered by a triggering signal, so that become the illegal state with certain duration.If multivibrator is in illegal state, then wink in the triggered time section as triggering signal will not have effect.The output of multivibrator produces the signal of this illegal state of indication.Wink in control time section as a control signal promptly is this output signal, or relevant with this output signal.This duration is still corresponding to the highest frequency within predetermined frequency range.If triggering signal has a repetition rate within scheduled frequency range, then each triggering signal will trigger a disable period, and this disable period before next triggering signal occurs with the right and wrong activity.Each triggering signal is supervened a control signal.If triggering signal has the repetition rate that is higher than the highest frequency in scheduled frequency range, then this signal will continue, and first triggering signal after appearing at this duration triggers the next one and forbids till phase and the next control signal.
By the mode description with reference to the accompanying drawings with example, above-mentioned aspect with other of the present invention will be described in detail.Wherein:
Fig. 1 is an embodiment according to display system of the present invention; With
Fig. 2 shows some signals of explanation operation according to control circuit of the present invention shown in Figure 1.
Fig. 1 shows an embodiment according to display system of the present invention.A synchronous circuit 5 receives a picture intelligence Pi and frame synchronizing signal Vs and line synchronizing signal Hs is delivered to an addressing circuit 7.This addressing circuit 7 comprises a capable addressing circuit, is used to respond the horizontal deflection electric current that this line synchronizing signal Hs produces process line deflector coil Lh; And a frame addressing circuit, be used to respond the frame deflection electric current that this frame synchronizing signal Vs produces process frame deflector coil Lv.This row addressing circuit produces a triggering signal St, and this signal frequency equals the repetition rate of horizontal deflection electric current or equals the repetition rate of line synchronizing signal Hs.One first power supply 1 receives non-stable input voltage Vac (for example AC line voltage), and stable output voltage V b is delivered to a second source 2, and this second source 2 is EHT power supplys, is used for anode voltage Va is delivered to the anode of picture tube 4.First power supply 1 and EHT power supply 2 are respectively by control signal Sc1 and Sc2 control.Control signal Sc1 and Sc2 determine the switching frequency of first power supply 1,2.A control circuit 6 receives triggering signal St, and control signal Sc1 and control signal Sc2 are provided.Control circuit 6 comprise two can not repeated trigger one-shot multivibrator (for example MM74HC221A of panasonic semiconductor company), promptly 60 and 61.Multivibrator 60 and 61 all has a negative transition that is connected to low level L to trigger input A, a removing input CLR who receives the positive transition triggering input B of triggering signal St and be connected to high level H.First multivibrator 60 has the output Q1 that control signal Sc1 is provided.Second multivibrator 61 has the output Q2 that control signal Sc2 is provided.Forbid in the phase that at one the rising edge of triggering signal St makes multivibrator 60 and 61 be rendered as illegal state.Each forbids that the phase all has a duration corresponding to first power supply 1 and 2 highest frequencies that can allow of second source.Because multivibrator 60 and 61 is operated in the same way, therefore the operation of first multivibrator 60 only is described.Because first multivibrator 60 cannot repeated trigger, thereby appear at and forbid that interim triggering signal St is invalid.Within a disable period, output signal Q1 is a movable high level.The rising edge of output signal Q1 is comprising the repetition rate information that is used to control first power supply 1.
Come operation again with reference to figure 2 explanation multivibrators 60.For example the highest switching frequency with first power supply 1 is chosen as 60KHZ, is required 16.7us so that forbid the duration of phase Td.The repetition rate that Fig. 2 a, 2b, 2c, 2d illustrate respectively with a triggering signal St is 15KHZ, 50KHZ, the operation of this multivibrator 60 when 70KHZ and 200KHZ.Only show the relevant wink activity time section of triggering signal St.The control signal Sc of switching frequency that determines first power supply 1 is relevant with the rising edge of output signal Q1.
An activity-triggered signal St who has illustrated at wink time section t0 in Fig. 2 a and 2b triggers into one with multivibrator 60 and forbids attitude, during this period in, output signal Q1 has high level in forbidding phase Td, up to wink section t1.After wink time section t1, when next triggering signal St appears at wink time section t2, in t2 ' time (this triggering signal St has a repetition rate in scheduled frequency range), each triggering signal St will trigger a disable period.To control signal Sc of triggering for generating each time of disable period, so that acquisition equals the switching frequency of first power supply 1 of line frequency, in this example, this frequency is respectively 15KHZ and 50KHZ.
In Fig. 2 c and 2d, a dynamic triggering signal St triggers into illegal state at wink time section t0 with multivibrator 60, is forbidding among the phase Td that up to wink time section t1 the output signal Q1 of this state has high level.The whole triggering signal that occurred before wink time section t1 all will be left in the basket." and the first triggering signal St of t2 appearance will trigger next illegal state to wink time section t2 after wink time section t1.So, if the repetition rate that triggering signal St has is higher than the highest frequency (60KHZ) within scheduled frequency range, then the first triggering signal St that occurs after forbidding certain duration of phase will trigger next disable period and next control signal Sc.In this way, the switching frequency of first power supply 1 appears within the predetermined frequency range, and the repetition rate that equals triggering signal removed the frequency that obtains by an integer greater than 1, and is high as much as possible, but is not higher than the highest frequency within scheduled frequency range.
Clearly, the above embodiments can have improvement within the scope of the invention of being declared.Though the present invention shows two synchro sources 1 and 2, each is all synchronous with oneself control signal Sc1 and Sc2, but also may use a control signal with repetition rate within the frequency range that all is suitable for for two power supplys to come synchronous two power supplys 1 and 2.Also may an only synchronous power supply.Replacing the another kind of scheme with a deflection circuit driving picture tube 4 is to utilize row and column to select matrix display of drives.Control circuit can also be chosen to a microcomputer, is programmed in a suitable mode.This microcomputer detects the wink time section that triggering signal St occurs, and produces the wink time section of the appearance of control signal Sc.This microcomputer can also be carried out the function of synchronous circuit.Detected horizontal sync time wink section can be used numeric representation.The wink time section that control signal Sc occurs is calculated according to these numerical value.Also possible is this power supply 1 and one of 2 is synchronized to control signal Sc2 and Sc1 or another relevant with it power supply 2; A signal of 1, rather than be synchronized to triggering signal St.More particularly, the control signal Sc1 of power supply 1 (electric network source) can obtain by the flyback pulse that produced by second source 2 (EHT power supply) signal divided by multivibrator 60.Multivibrator 60 and 61 can be replaced by other the circuit of frequency being made division arithmetic in a kind of suitable mode.
To should not be construed be restriction to the scope of claim to reference symbol in the bracket of Shi Yonging in the claims.
A most preferred embodiment determining integer according to the present invention is summarized as follows.
If row addressing repetition rate appears within the scheduled frequency range of power supply, this integer is 1.
If repetition rate is higher than the highest frequency within the scheduled frequency range, then the feasible switching frequency that appears at the power supply (1,2) within the preset range of determining of this integer is positioned as close to this highest frequency.
Claims (11)
1. be used for power supply (1,2) is synchronized with a kind of method of a capable addressing repetition rate of capable addressing circuit (7),
This method includes step:
Produce (7) and have wink in a triggered time section (St) that triggers repetition rate that equals row addressing repetition rate;
Determine (6) one greater than zero integer according to triggering repetition rate; And
Respond this wink in triggered time section (St) and produce (6) wink in control time section (Sc1, Sc2), so that determine power supply (1,2) switching frequency, this in wink in control time section (Sc1, the repetition rate that Sc2) has is that this triggering repetition rate is removed by this integer and a frequency obtaining, it is characterized in that, this in wink in control time section (Sc1, repetition rate Sc2) can be assumed to several values within scheduled frequency range; Its feature also is, this integer is determined the step of (6) produces such integer, and it satisfies with this integer removal triggering signal repetition rate income value provides wink in the control time section in this scheduled frequency range (Sc1, repetition rate Sc2).
2. as claimed in claim 1 power supply (1,2) is carried out synchronous method, it is characterized in that, determine that the employing of the step of (6) integer makes that this integer is to equal 1 for the whole triggering repetition rates within scheduled frequency range.
3. as claimed in claim 2 to power supply (1,2) carry out synchronous method, it is characterized in that, the employing of determining the step of (6) integer produces an integer, if triggering repetition rate is the highest frequency that is higher than within scheduled frequency range, then the value of this integer makes control signal (Sc1, repetition rate Sc2) is as much as possible near this highest frequency, but is not higher than this highest frequency.
4. as claimed in claim 3 power supply (1,2) is carried out synchronous method, it is characterized in that, the step of determining (6) integer comprises the steps: to respond triggering signal (St) and produces the disable period that (60,61) have certain duration (Td); With, if triggering signal (St) does not occur before forbidding the phase previous, then respond this triggering signal, (Sc1, Sc2), certain here duration (Td) is corresponding to highest frequency to produce control signal in certain duration (Td).
5. a display system comprises:
An image display apparatus (4) is used for displayed image information (Pi);
The addressing circuit of speed row more than (7) is used to produce the row addressing of the image display apparatus (4) with a capable addressing repetition rate, and is used to produce the triggering signal (St) that the triggering repetition rate equals this row addressing repetition rate;
A synchro source (1,2), be used to produce supply power voltage (Vb, Va);
Device (6) is used for determining one greater than zero integer according to triggering repetition rate; And
Device (6), respond this triggering signal (St) produce control signal (Sc1, Sc2) so that determine the switching frequency of power supply (1,2), this control signal (Sc1, the repetition rate that Sc2) has is that this triggering frequency is removed by this integer and a frequency obtaining;
It is characterized in that,
This control signal (Sc1, repetition rate Sc2) can be assumed to several values within scheduled frequency range; Its feature also is,
This integer is determined the integer division triggering signal repetition rate income value that the device of (6) produces, control signal (Sc1, repetition rate Sc2) in this scheduled frequency range are provided.
6. display system as claimed in claim 5, it is characterized in that, the device (6) that is used for definite integer comprises the multivibrator (60 of a not reproducible triggering, 61), an input (B) and coupling that having is coupled receives triggering signal (St) provide control signal (Sc1, an output Sc2) (Q1, Q2); If this triggering signal (St) is not to appear at during the previous illegal state, then this triggering signal (St) makes this multivibrator become the illegal state with certain duration (Td); With, if this triggering signal (St) appears at this when forbidding within the phase, then (Q1 Q2) rests on illegal state in output.
7. a control circuit (6) is used for a power supply (1,2) is synchronized with a triggering signal (St) that triggers frequency with the capable addressing repetition rate that equals row addressing circuit (7), and this control circuit (6) comprising:
Device (6) is used for determining one greater than zero integer according to the repetition rate that triggers; And
Device (6), respond this triggering signal (St) produce control signal (Sc1, Sc2) so that determine the switching frequency of power supply (1,2), this control signal (Sc1, the repetition rate that Sc2) has is that this triggering frequency is removed by this integer and a frequency obtaining;
It is characterized in that,
This control signal (Sc1, repetition rate Sc2) can be assumed to several values within scheduled frequency range; Its feature also is,
This integer is determined that the integer division triggering signal that the device of (6) produces repeats income value in the frequency, provides control signal (Sc1, repetition rate Sc2) in this scheduled frequency range.
8. be used for a power supply (1,2) is synchronized with a device of a capable addressing repetition rate of a capable addressing circuit (7), this synchronizer comprises:
Device is used for producing (7) and has wink in a triggered time section (St) that triggers repetition rate that equals row addressing repetition rate;
Device is determined (6) one greater than zero integer according to triggering repetition rate; With
Device, respond this wink in triggered time section (St) and produce (6) wink in control time section (Sc1, Sc2), so that determine the switching frequency of power supply (1,2), this wink in control time section (Sc1, Sc2) repetition rate that has is that this triggering repetition rate is removed by this integer and a frequency obtaining, it is characterized in that, this in wink in control time section (Sc1, repetition rate Sc2) can be assumed to several values within scheduled frequency range; Its feature also is, this integer is determined the value of the integer division triggering signal repetition rate gained that the step of (6) produces to provide wink in control time section (Sc1, repetition rate Sc2) in this scheduled frequency range.
9. as claimed in claim 8 power supply (1,2) is carried out synchronous device, it is characterized in that, determine that the employing of the device of (6) integer makes that this integer is to equal 1 for the whole triggering repetition rates within scheduled frequency range.
10. as claimed in claim 9 to power supply (1,2) carry out synchronous device, it is characterized in that, the employing of determining the device of (6) integer produces an integer, if triggering repetition rate is the highest frequency that is higher than within scheduled frequency range, then the value of this integer makes control signal (Sc1, repetition rate Sc2) is as much as possible near this highest frequency, but is not higher than this highest frequency.
11. as claim 10 power supply (1,2) is carried out synchronous device, it is characterized in that the device of determining (6) integer comprises the steps: to respond triggering signal (St) and produces the disable period that (60,61) have certain duration (Td); With, if triggering signal (St) does not forbid that previous the phase occurs, then respond this triggering signal during certain duration (Td), produce a control signal (Sc1, Sc2), here necessarily the duration corresponding to highest frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95195198 CN1158682A (en) | 1995-06-01 | 1995-06-01 | Power supply synchronization and appts. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95195198 CN1158682A (en) | 1995-06-01 | 1995-06-01 | Power supply synchronization and appts. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1158682A true CN1158682A (en) | 1997-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95195198 Pending CN1158682A (en) | 1995-06-01 | 1995-06-01 | Power supply synchronization and appts. |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1158682A (en) |
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1995
- 1995-06-01 CN CN 95195198 patent/CN1158682A/en active Pending
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