CN109725192A - The output voltage method of sampling and circuit for PSR power-supply system - Google Patents
The output voltage method of sampling and circuit for PSR power-supply system Download PDFInfo
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- CN109725192A CN109725192A CN201910068392.8A CN201910068392A CN109725192A CN 109725192 A CN109725192 A CN 109725192A CN 201910068392 A CN201910068392 A CN 201910068392A CN 109725192 A CN109725192 A CN 109725192A
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Abstract
The present invention relates to a kind of output voltage method of samplings and circuit suitable for PSR power-supply system, voltage sample is carried out based on sampling square-wave signal and sampled input voltage signal, according to present sample input voltage, the initial time of sampling and the pulsewidth of sampling square-wave signal are determined.The Variable Area sampling of PSR power-supply system output voltage can be achieved in the present invention, and sampled voltage, which can change output voltage, carries out effective compensation.
Description
Technical field
The present invention relates to a kind of output voltage method of samplings and circuit for PSR power-supply system.
Background technique
In the prior art, as shown in Figure 1 and Figure 2, the output voltage sampling of PSR (primary side feedback) power-supply system passes through fixation
Delay forms sampling square-wave signal plus fixed pulse width generator, based on sampling square-wave signal Fsam and sampled input voltage Vfb
Voltage sample is carried out, sampled voltage signal Vsample is exported.FB voltage (feedback electricity of the existing sample mode in PSR power-supply system
Pressure) be disadvantageous in that present in acquisition, when PSR power-supply system in Tons (demagnetization time) variation (load or input electricity
When buckling), collected output voltage is variation.Such as when Tons reduces (load reduction), sampled voltage will appear
In the section rearward of Tons, lead to collected low voltage；By negative voltage feedback ring, system will raise output voltage.But
It is actually when load reduction, output voltage is raised, and it is desirable that output voltage drop is lower, institute is previous
It is past to need separately to compensate by other approach.
Summary of the invention
Goal of the invention of the invention is to provide a kind of output voltage method of sampling and electricity suitable for PSR power-supply system
, it can be achieved that the Variable Area of PSR power-supply system output voltage samples, sampled voltage, which can change output voltage, to be carried out effectively on road
Compensation.
Based on the same inventive concept, there are two independent technical solutions for present invention tool:
1, a kind of output voltage method of sampling for PSR power-supply system, based on sampling square-wave signal and sampling input electricity
Signal is pressed to carry out voltage sample, it is characterised in that: according to present sample input voltage, to determine the initial time and sampling side of sampling
The pulsewidth of wave signal.
Further, present sample input voltage is detected, delay proportionality coefficient A is determined according to present sample input voltage；
The current demagnetization time Tons of detection, and according to delay proportionality coefficient A and current demagnetization time Tons, determine sampling square-wave signal
Pulsewidth Tsam_wd；According to delay proportionality coefficient A, sampling initial time is determined；According to the sampling initial time of above-mentioned acquisition and adopt
The pulsewidth Tsam_wd of sample square-wave signal, determines present sample square-wave signal, based on present sample square-wave signal and sampling input electricity
Pressure carries out voltage sample.
Further, delay proportionality coefficient A be inversely proportional with present sample input voltage, delay proportionality coefficient A with acquire
Time beginning is directly proportional.
Further,
Delay proportionality coefficient A is determined based on following formula:
A=k* (Vref-Vfb),
Wherein Vref >=Vfb；K is constant, and Vref is benchmark voltage；
And sampling initial time tsam_start is determined based on following formula:
Tsam_start=(A-A0) * Tons+t0,
Wherein A0 is minimum delay proportionality coefficient, and t0 is minimum sampling initial time.
Further, the pulsewidth Tsam_wd for sampling square-wave signal is obtained by following formula,
Tsam_wd=Tons*A.
2, a kind of output voltage sampling circuit for PSR power-supply system, comprising:
Constant time lag unit, for determining the constant time lag of sampling square-wave signal；
Ratio delay coefficient elements, it is defeated according to present sample for detecting the present sample input voltage of PSR power-supply system
Enter voltage and determines delay proportionality coefficient A；And
Area sampling signal element, for determining rising for sampling according to delay proportionality coefficient A and present sample input voltage
The pulsewidth of time beginning and sampling square-wave signal is to carry out voltage sample.
Further, the area sampling signal element further include:
Proportional integration comparator unit according to delay proportionality coefficient A and is currently moved back for detecting current demagnetization time Tons
Magnetic time Tons determines the pulsewidth Tsam_wd of sampling square-wave signal, and according to delay proportionality coefficient A, determines the starting of sampling
Time；
Square wave signal generating unit is sampled, for according to the sampling initial time of above-mentioned acquisition and the arteries and veins of sampling square-wave signal
Wide Tsam_wd exports present sample square-wave signal；
Sample holding unit, for carrying out voltage sample, output according to present sample square-wave signal and sampled input voltage
Sampled voltage signal.
Further, delay proportionality coefficient A size be inversely proportional with present sample input voltage, be delayed proportionality coefficient A with adopt
It is directly proportional to collect initial time.
Further, delay proportionality coefficient A is determined based on following formula:
A=k* (Vref-Vfb),
Wherein Vref >=Vfb；K is constant, and Vref is benchmark voltage；
And sampling initial time tsam_start is determined based on following formula:
Tsam_start=(A-A0) * Tons+t0,
Wherein A0 is minimum delay proportionality coefficient, and t0 is minimum sampling initial time.
Further, the pulsewidth Tsam_wd for sampling square-wave signal is obtained by following formula,
Tsam_wd=Tons*A.
The invention has the benefit that
The present invention determines the initial time of sampling and the pulsewidth of sampling square-wave signal according to present sample input voltage；Inspection
The present sample input voltage for surveying PSR power-supply system determines delay proportionality coefficient A according to present sample input voltage；Detect PSR
The current demagnetization time Tons of power-supply system determines sampling square wave letter according to delay proportionality coefficient A, current demagnetization time Tons
Number pulsewidth Tsam_wd；According to delay proportionality coefficient A, the initial time of sampling is determined；When being originated according to the sampling of above-mentioned acquisition
Between, sampling square-wave signal pulsewidth Tsam_wd, determine present sample square-wave signal, be based on present sample square-wave signal and sampling
Input voltage carries out voltage sample.Compared with prior art, sampling square-wave signal initial time of the invention, adjustable pulse width, can
Realize the Variable Area sampling of PSR power-supply system output voltage, sampled voltage, which can change output voltage, carries out effective compensation.
When system load mitigates, FB voltage is raised the proportionality coefficient A that causes to be delayed and is reduced, while Tons reduces, the acquisition of system at this time
Signal pulsewidth Tsam_wd=Tons*A will reduce, and collection point shifts to an earlier date, this to shift to an earlier date collection point, and the side that region reduces
Formula efficiently avoids system acquisition to " collapsing " region of FB voltage waveform, so that electric power output voltage be avoided accidentally to raise.When
When system load increases, the FB voltage reduction proportionality coefficient A that causes to be delayed increases, while the Tons time increases, and system is adopted at this time
Collection signal pulsewidth Tsam_wd=Tons*A will increase, and collection point is delayed.The Vfb_ that this mode can allow system acquisition to arrive
Sam voltage is more accurate, more stable.
Detailed description of the invention
Fig. 1 is existing sample mode schematic diagram；
Fig. 2 is the signal waveforms of existing sample mode；
Fig. 3 is sample mode schematic diagram of the present invention；
Fig. 4 is that present invention sampling square wave signal generation divides schematic diagram.
Specific embodiment
The present invention is described in detail for each embodiment shown in reference to the accompanying drawing, but it should be stated that, these
Embodiment is not limitation of the present invention, those of ordinary skill in the art according to these embodiments made by function, method,
Or equivalent transformation or substitution in structure, all belong to the scope of protection of the present invention within.
Embodiment one:
The output voltage method of sampling suitable for PSR power-supply system
According to present sample input voltage, the initial time of sampling and the pulsewidth of sampling square-wave signal are determined, based on sampling
Square-wave signal and sampled input voltage signal carry out voltage sample.
When it is implemented, the present sample input voltage of detection PSR power-supply system, determines according to present sample input voltage
Be delayed proportionality coefficient A；The current demagnetization time Tons for detecting PSR power-supply system, when according to delay proportionality coefficient A, current demagnetization
Between Tons, determine sampling square-wave signal pulsewidth Tsam_wd；According to delay proportionality coefficient A, the initial time of sampling is determined；
According to the sampling initial time of above-mentioned acquisition, the pulsewidth Tsam_wd of sampling square-wave signal, present sample square wave is determined
Signal carries out voltage sample based on present sample square-wave signal and sampled input voltage.
Wherein, the size of proportionality coefficient A that is delayed and the size of present sample input voltage are inversely proportional, and be delayed proportionality coefficient A
Size to sampling initial time it is directly proportional.
In a specific embodiment, be delayed proportionality coefficient A and sampled input voltage Vfb between specific formula for example
Are as follows:
A=k* (Vref-Vfb),
Wherein Vref >=Vfb；K is constant, and Vref is benchmark voltage；
In a specific embodiment, the specific public affairs being delayed between proportionality coefficient A and sampling initial time tsam_start
Formula is for example are as follows:
Tsam_start=(A-A0) * Tons+t0,
Wherein A0 is minimum delay proportionality coefficient, and t0 is minimum sampling initial time, and Tons is the current demagnetization time.
In a specific embodiment, the pulsewidth Tsam_wd for sampling square-wave signal can for example be obtained by following formula,
Tsam_wd=Tons*A
When system load mitigates, FB voltage is raised the proportionality coefficient A that causes to be delayed and is reduced, while Tons reduces, and is at this time
The acquisition signal pulsewidth Tsam_wd=Tons*A of system will reduce, and collection point shifts to an earlier date, this to shift to an earlier date collection point, and adopt
The mode that sample signal pulsewidth (region) reduces efficiently avoids system acquisition to " collapsing " region of FB voltage waveform, to keep away
Exempt from electric power output voltage accidentally to raise.When system load increases, the reduction of FB voltage leads to the proportionality coefficient A increase that is delayed, simultaneously
The Tons time increases, and the acquisition signal pulsewidth Tsam_wd=Tons*A of system will increase at this time, and collection point is delayed, this
The Vfb_sam voltage that mode can allow system acquisition to arrive is more accurate, more stable.
Embodiment two:
Output voltage sampling circuit for PSR power-supply system
As shown in figure 3, a kind of output voltage sampling circuit for PSR power-supply system, comprising: constant time lag unit, Gu
Determine delay unit for determine sample square-wave signal constant time lag；Ratio delay coefficient elements, for detecting PSR power-supply system
Present sample input voltage, according to present sample input voltage determine delay proportionality coefficient A；And area sampling signal list
Member.
Further, as shown in figure 4, area sampling signal element may particularly include proportional integration comparator unit, rise
Along acquisition unit, failing edge delay unit, regional signal combinatorial logic unit (sampling square wave signal generating unit).
Wherein, proportional integration comparator unit is used to detect the current demagnetization time Tons of PSR power-supply system, according to delay
Proportionality coefficient A, current demagnetization time Tons, determine the pulsewidth Tsam_wd of sampling square-wave signal；According to delay proportionality coefficient A, really
Surely the initial time sampled.
Square wave signal generating unit is sampled according to the sampling initial time of above-mentioned acquisition, the pulsewidth of sampling square-wave signal
Tsam_wd exports present sample square-wave signal.
Area sampling signal element further includes sample holding unit, for being inputted according to present sample square-wave signal and sampling
Voltage carries out voltage sample, exports sampled voltage signal.
Wherein, the size of proportionality coefficient A that is delayed and the size of present sample input voltage are inversely proportional；Be delayed proportionality coefficient A
Size to acquisition initial time it is directly proportional.
Specific formula between delay proportionality coefficient A and sampled input voltage Vfb are as follows:
A=k* (Vref-Vfb),
Wherein Vref >=Vfb；K is constant, and Vref is benchmark voltage；
Delay proportionality coefficient A and the specific formula sampled between initial time tsam_start are
Tsam_start=(A-A0) * Tons+t0,
Wherein A0 is minimum delay proportionality coefficient, and t0 is minimum sampling initial time.
The pulsewidth Tsam_wd of sampling square-wave signal is obtained by following formula,
Tsam_wd=Tons*A.
As shown in figure 4, input signal has: demagnetization signal Tons, excitation signal Tonp, sampled input voltage signal FB；It is defeated
Signal has out: sampling square-wave output signal sam_region；The output signal of intermediate link has: ratio delay coefficient A, Tons ratio
Example integral contrast device exports sam_anti, and failing edge delay cell exports Tonp_td, and (pulsewidth is true according to ratio delay coefficient A
It is fixed), there are also sample square-wave output signal sam_region.
The series of detailed descriptions listed above only for feasible embodiment of the invention specifically
Protection scope bright, that they are not intended to limit the invention, it is all without departing from equivalent implementations made by technical spirit of the present invention
Or change should all be included in the protection scope of the present invention.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.
Claims (10)
1. a kind of output voltage method of sampling for PSR power-supply system, based on sampling square-wave signal and sampled input voltage letter
Number carry out voltage sample, it is characterised in that: according to present sample input voltage, determine the initial time and sampling square wave letter of sampling
Number pulsewidth.
2. the output voltage method of sampling according to claim 1 for PSR power-supply system, it is characterised in that: detection is worked as
Preceding sampled input voltage determines delay proportionality coefficient A according to present sample input voltage；
The current demagnetization time Tons of detection, and according to delay proportionality coefficient A and current demagnetization time Tons, determine sampling square wave letter
Number pulsewidth Tsam_wd；According to delay proportionality coefficient A, sampling initial time is determined；
According to the pulsewidth Tsam_wd of the sampling initial time of above-mentioned acquisition and sampling square-wave signal, determine that present sample square wave is believed
Number, voltage sample is carried out based on present sample square-wave signal and sampled input voltage.
3. the output voltage method of sampling according to claim 2 for PSR power-supply system, it is characterised in that: delay ratio
Example coefficient A is inversely proportional with present sample input voltage, and delay proportionality coefficient A is directly proportional to acquisition initial time.
4. the output voltage method of sampling according to claim 3 for PSR power-supply system, it is characterised in that:
Delay proportionality coefficient A is determined based on following formula:
A=k* (Vref-Vfb),
Wherein Vref >=Vfb；K is constant, and Vref is benchmark voltage；
And sampling initial time tsam_start is determined based on following formula:
Tsam_start=(A-A0) * Tons+t0,
Wherein A0 is minimum delay proportionality coefficient, and t0 is minimum sampling initial time.
5. the output voltage method of sampling according to claim 4 for PSR power-supply system, it is characterised in that: sampling side
The pulsewidth Tsam_wd of wave signal is obtained by following formula,
Tsam_wd=Tons*A.
6. a kind of output voltage sampling circuit for PSR power-supply system, comprising:
Constant time lag unit, for determining the constant time lag of sampling square-wave signal；
Ratio delay coefficient elements input electricity according to present sample for detecting the present sample input voltage of PSR power-supply system
Pressure determines delay proportionality coefficient A；And
Area sampling signal element, when being used to determine the starting of sampling according to delay proportionality coefficient A and present sample input voltage
Between and sampling square-wave signal pulsewidth to carry out voltage sample.
7. output voltage sampling circuit according to claim 6, which is characterized in that the area sampling signal element is also wrapped
It includes:
Proportional integration comparator unit, for detecting current demagnetization time Tons, when according to delay proportionality coefficient A and current demagnetization
Between Tons, determine sampling square-wave signal pulsewidth Tsam_wd, and according to delay proportionality coefficient A, determine sampling starting when
Between；
Square wave signal generating unit is sampled, for according to the sampling initial time of above-mentioned acquisition and the pulsewidth of sampling square-wave signal
Tsam_wd exports present sample square-wave signal；
Sample holding unit, for carrying out voltage sample, output sampling according to present sample square-wave signal and sampled input voltage
Voltage signal.
8. output voltage sampling circuit according to claim 6, it is characterised in that: delay proportionality coefficient A size and current
Sampled input voltage is inversely proportional, and delay proportionality coefficient A is directly proportional to acquisition initial time.
9. output voltage sampling circuit according to claim 7, it is characterised in that:
Delay proportionality coefficient A is determined based on following formula:
A=k* (Vref-Vfb),
Wherein Vref >=Vfb；K is constant, and Vref is benchmark voltage；
And sampling initial time tsam_start is determined based on following formula:
Tsam_start=(A-A0) * Tons+t0,
Wherein A0 is minimum delay proportionality coefficient, and t0 is minimum sampling initial time.
10. output voltage sampling circuit according to claim 7, it is characterised in that: sample the pulsewidth Tsam_ of square-wave signal
Wd is obtained by following formula,
Tsam_wd=Tons*A.
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Cited By (1)
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| CN110398196A (en) * | 2019-07-19 | 2019-11-01 | 陕西威尔机电科技有限公司 | A kind of LVDT sensor signal processing method and system for accurate measurement |
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| US7564903B2 (en) * | 2005-10-07 | 2009-07-21 | System General Corp. | Method and apparatus for measuring reflected voltage of transformer |
| CN101226411A (en) * | 2008-01-22 | 2008-07-23 | 佛山市顺德区瑞德电子实业有限公司 | Power consumption measuring and control method for sound system switch power source as well as special device thereof |
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Address after: No. 5, Xijin Road, Xinwu District, Wuxi City, Jiangsu Province, 214028 Patentee after: Wuxi Jingyuan Microelectronics Co.,Ltd. Address before: Room 209, building a, block 106-c, national high tech Industrial Development Zone, Wuxi City, Jiangsu Province, 214028 Patentee before: Wuxi Jingyuan Microelectronics Co.,Ltd. |