CN1811473A - Automatic measuring and displaying method for duty ratio - Google Patents
Automatic measuring and displaying method for duty ratio Download PDFInfo
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- CN1811473A CN1811473A CN 200510017342 CN200510017342A CN1811473A CN 1811473 A CN1811473 A CN 1811473A CN 200510017342 CN200510017342 CN 200510017342 CN 200510017342 A CN200510017342 A CN 200510017342A CN 1811473 A CN1811473 A CN 1811473A
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- circuit
- dutycycle
- frequency
- measured
- controlled oscillator
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Abstract
The present invention discloses a duty ratio automatic measurement and display method. It is characterized by that said invention utilizes the frequency reference signal produced by controllable oscillator of system, duty ratio waveform obtained by frequency division and externally-inputted duty ratio signal wave form to make comparison to control the frequency of controllable oscillator so as to make it real time track the externally-inputted duty ratio signal to be measured and implement measurement of duty ratio and digitally display measured result. Said invention adopts controllable oscillator and comparison integrating circuit, etc., so that it can implement automatic measurement of duty ratio, control angle and conduction angle and digital display.
Description
Technical field
The present invention relates to a kind of Power Electronic Technique experimental provision, especially relate to a kind of dutycycle and measure automatically and display packing.
Background technology
" Power Electronic Technique experimental provision " is the indispensable general experimental facilitiess of specialty such as the electrician of universities and colleges, electronics, electric, robotization, and at present domestic have bright, realistic, auspicious new, the Rui Te in a lot of manufacturers such as sky, section China or the like all to produce this series products.But these product ubiquity design defect: in all DC chopped-wave and width modulation experiment, all be to adopt the method for oscillograph comparison to read to the measurement of important parameter dutycycle, it is bigger to read error; Make the very big error of existence between experimental measurements and the calculated value.
Summary of the invention
The dutycycle that purpose of the present invention just is to provide that a kind of duty ratio measuring is more accurate, measurement result can numeral shows is measured and display packing automatically.
Purpose of the present invention can realize by following measure:
The frequency reference signal that the present invention is produced by system's controlled oscillator, the dutycycle waveform that frequency division obtains compares with outer input duty cycle signal waveform, control the frequency of controlled oscillator, make it the outer input of real-time follow-up duty cycle signals to be measured, finish the measurement to dutycycle, the result of measurement shows with numeral.
System among the present invention comprises synchronizing voltage circuit, Waveform generating circuit, controllable oscillatory circuit, frequency dividing circuit, integration holding circuit, comparator circuit and measurement display circuit; Wherein, the synchronizing voltage circuit outputs to Waveform generating circuit, controllable oscillatory circuit respectively and measures display circuit, the controllable oscillatory circuit is input to frequency dividing circuit respectively and measures display circuit, Waveform generating circuit and frequency dividing circuit all are connected to comparator circuit, comparator circuit is connected to integrating circuit, and integrating circuit is connected to the controllable oscillatory circuit.Described controlled oscillator is a voltage controlled oscillator.Perhaps, controlled oscillator is a frequency-modulated generator.
The present invention makes dutycycle, pilot angle and conduction angle realize that all automatic measurement and numeral show owing to adopt controlled oscillator and comparison integrating circuit etc.The display precision of dutycycle reaches ± and 0.001 when doing experiment, the adjustment process that both can observe dutycycle and pilot angle with oscillograph intuitively can obtain measurement data accurately again, and Theoretical Calculation and experimental result meet finely.Improved the quality of experiment greatly.In addition, also can be used for field of power system control.This achievement in research has been passed through the technical appraisement (maintaining secrecy) of colleges and universities in Dec, 2004.This invention stable performance, easy to operate, can realize 24 Power Electronic Experimentation, can satisfy requirement of experiment.System's overcurrent-overvoltage creepage protection function is perfect, and is safe and reliable, reached the technical requirement of stipulating in the development agreement.Particularly aspect realization dutycycle, pilot angle, the demonstration of conduction angle numeral, innovation possesses skills, think that through Committee of Experts's evaluation this device reaches the advanced level of homogeneous system, the top standard who occupies homogeneous system aspect the numeral demonstration of dutycycle, pilot angle and conduction angle.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present invention;
Fig. 2 be circuit diagram of the present invention (on).
Fig. 3 is circuit diagram of the present invention (descending).
Embodiment
The present invention does with detailed description below in conjunction with drawings and Examples:
Embodiment 1, as shown in the figure, the frequency reference signal that the present invention is produced by system's controlled oscillator, the dutycycle waveform that frequency division obtains compares with outer input duty cycle signal waveform, control the frequency of controlled oscillator, make it the outer input of real-time follow-up duty cycle signals to be measured, finish the measurement to dutycycle, the result of measurement shows with numeral.Described system comprises synchronizing voltage circuit, Waveform generating circuit, controllable oscillatory circuit, frequency dividing circuit, integration holding circuit, comparator circuit and measurement display circuit; Wherein, the synchronizing voltage circuit outputs to Waveform generating circuit, controllable oscillatory circuit respectively and measures display circuit, the controllable oscillatory circuit is input to frequency dividing circuit respectively and measures display circuit, Waveform generating circuit and frequency dividing circuit all are connected to comparator circuit, comparator circuit is connected to integrating circuit, and integrating circuit is connected to the controllable oscillatory circuit.Described controlled oscillator is a voltage controlled oscillator.
Principle of work of the present invention is as follows:
Dutycycle D is meant the width T of a rect.p.
OnIn whole period T
sInterior shared ratio, promptly
If at T
sTime is interior to be f to frequency
rStep-by-step counting, count results is T
sf
r, at T
OnThe time inside counting is T
Onf
r, dutycycle then
If can make T
sf
rUnder any circumstance all equal constant 1000, then dutycycle D=0.001T
Onf
r, promptly at T
OnThe value T of time inside counting
Onf
r, per mille be dutycycle.Obviously, as long as use f
rTo T
OnCounting, radix point moves to left three and promptly gets dutycycle D, and at this moment, the measuring accuracy of D is a per mille.Present problem is how to obtain a reference frequency f
rAnd guarantee for any different cycles T
sPulse signal to be measured all can satisfy T
sf
r=1000? the principle that realizes this relation is as follows: import pulse T to be measured
sThe forward position starting of oscillation starting point of coming synchronous pressure oscillator as synchronizing signal, and to produce one-period be 2T
sSquare wave A, f
r÷ 2000 another square wave B, the error signal that compares with square wave A and square wave B is controlled the output f of voltage controlled oscillator
rWhen A=B, have
D=0.001T then
Onf
r
Embodiment 2, as shown in the figure, the frequency reference signal that the present invention is produced by system's controlled oscillator, the dutycycle waveform that frequency division obtains compares with outer input duty cycle signal waveform, control the frequency of controlled oscillator, make it the outer input of real-time follow-up duty cycle signals to be measured, finish the measurement to dutycycle, the result of measurement shows with numeral.Described system comprises synchronizing voltage circuit, Waveform generating circuit, controllable oscillatory circuit, frequency dividing circuit, integration holding circuit, comparator circuit and measurement display circuit; Wherein, the synchronizing voltage circuit outputs to Waveform generating circuit, controllable oscillatory circuit respectively and measures display circuit, the controllable oscillatory circuit is input to frequency dividing circuit respectively and measures display circuit, Waveform generating circuit and frequency dividing circuit all are connected to comparator circuit, comparator circuit is connected to integrating circuit, and integrating circuit is connected to the controllable oscillatory circuit.Described controlled oscillator is a frequency-modulated generator.
Principle of work of the present invention is as follows:
Dutycycle D is meant the width T of a rect.p.
OnIn whole period T
sInterior shared ratio, promptly
If at T
sTime is interior to be f to frequency
rStep-by-step counting, count results is T
sf
r, at T
OnThe time inside counting is T
Onf
r, dutycycle then
If can make T
sf
rUnder any circumstance all equal constant 1000, then dutycycle D=0.001T
Onf
r, promptly at T
OnThe value T of time inside counting
Onf
r, per mille be dutycycle.Obviously, as long as use f
rTo T
OnCounting, radix point moves to left three and promptly gets dutycycle D, and at this moment, the measuring accuracy of D is a per mille.Present problem is how to obtain a reference frequency f
rAnd guarantee for any different cycles T
sPulse signal to be measured all can satisfy T
sf
r=1000? the principle that realizes this relation is as follows: import pulse T to be measured
sThe forward position starting of oscillation starting point of coming synchronous pressure oscillator as synchronizing signal, and to produce one-period be 2T
sSquare wave A, f
r÷ 2000 another square wave B, the error signal that compares with square wave A and square wave B is controlled the output f of voltage controlled oscillator
rWhen A=B0, have
D=0.001T then
Onf
r
Principle of work of the present invention is as follows:
Dutycycle D is meant the width T of a rect.p.
OnIn whole period T
sInterior shared ratio, promptly
If at T
sTime is interior to be f to frequency
rStep-by-step counting, count results is T
sf
r, at T
OnThe time inside counting is T
Onf
r, dutycycle then
If can make T
sf
rUnder any circumstance all equal constant 1000, then dutycycle D=0.001T
Onf
r, promptly at T
OnThe value T of time inside counting
Onf
r, per mille be dutycycle.Obviously, as long as use f
rTo T
OnCounting, radix point moves to left three and promptly gets dutycycle D, and at this moment, the measuring accuracy of D is a per mille.Present problem is how to obtain a reference frequency f
rAnd guarantee for any different cycles T
sPulse signal to be measured all can satisfy T
sf
r=1000? the principle that realizes this relation is as follows: import pulse T to be measured
sThe forward position starting of oscillation starting point of coming synchronous pressure oscillator as synchronizing signal, and to produce one-period be 2T
sSquare wave A, f
r÷ 2000 another square wave B, the error signal that compares with square wave A and square wave B is controlled the output f of voltage controlled oscillator
rWhen A=B, have
D=0.001T then
Onf
r
In addition, the method that also can adopt voltage to transform is measured.Even use a dutycycle
DC voltage V of signal controlling
D, output, then Shu Chu average voltage is V
O=D*V
D, work as V
D=1 o'clock, output voltage V then
O=D.
Claims (4)
1, a kind of dutycycle is measured and display packing automatically, it is characterized in that: by the frequency reference signal of system's controlled oscillator generation, the dutycycle waveform that frequency division obtains compares with outer input duty cycle signal waveform, control the frequency of controlled oscillator, make it the outer input of real-time follow-up duty cycle signals to be measured, finish the measurement to dutycycle, the result of measurement shows with numeral.
2, dutycycle according to claim 1 is measured and display packing automatically, and it is characterized in that: described system comprises synchronizing voltage circuit, Waveform generating circuit, controllable oscillatory circuit, frequency dividing circuit, integration holding circuit, comparator circuit and measurement display circuit; Wherein, the synchronizing voltage circuit outputs to Waveform generating circuit, controllable oscillatory circuit respectively and measures display circuit, the controllable oscillatory circuit is input to frequency dividing circuit respectively and measures display circuit, Waveform generating circuit and frequency dividing circuit all are connected to comparator circuit, comparator circuit is connected to integrating circuit, and integrating circuit is connected to the controllable oscillatory circuit.
3, dutycycle according to claim 1 and 2 is measured and display packing automatically, and it is characterized in that: described controlled oscillator is a voltage controlled oscillator.
4, dutycycle according to claim 1 and 2 is measured and display packing automatically, and it is characterized in that: described controlled oscillator is a frequency-modulated generator.
Priority Applications (1)
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CN 200510017342 CN1811473A (en) | 2005-01-25 | 2005-01-25 | Automatic measuring and displaying method for duty ratio |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 200510017342 CN1811473A (en) | 2005-01-25 | 2005-01-25 | Automatic measuring and displaying method for duty ratio |
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CN1811473A true CN1811473A (en) | 2006-08-02 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102478610A (en) * | 2010-11-30 | 2012-05-30 | 英业达股份有限公司 | Duty ratio measuring system and method |
CN101629978B (en) * | 2008-12-26 | 2012-10-03 | 四川和芯微电子股份有限公司 | Method and circuit for realizing real-time monitoring for duty ratio |
CN103490699A (en) * | 2012-06-13 | 2014-01-01 | 赐福科技股份有限公司 | Current measurement circuit and motor control device with same |
-
2005
- 2005-01-25 CN CN 200510017342 patent/CN1811473A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101629978B (en) * | 2008-12-26 | 2012-10-03 | 四川和芯微电子股份有限公司 | Method and circuit for realizing real-time monitoring for duty ratio |
CN102478610A (en) * | 2010-11-30 | 2012-05-30 | 英业达股份有限公司 | Duty ratio measuring system and method |
CN103490699A (en) * | 2012-06-13 | 2014-01-01 | 赐福科技股份有限公司 | Current measurement circuit and motor control device with same |
CN103490699B (en) * | 2012-06-13 | 2016-04-13 | 赐福科技股份有限公司 | Current measurement circuit and motor control device with same |
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