CN1811473A - Automatic measuring and displaying method for duty ratio - Google Patents

Automatic measuring and displaying method for duty ratio Download PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
circuit
dutycycle
frequency
measured
controlled oscillator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN 200510017342
Other languages
Chinese (zh)
Inventor
刘忠义
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN 200510017342 priority Critical patent/CN1811473A/en
Publication of CN1811473A publication Critical patent/CN1811473A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Measuring Frequencies, Analyzing Spectra (AREA)

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

Dutycycle is measured and display packing automatically
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 D = T on T s . 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 D = T on * f r T s * f r ; 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 f r = 1000 T s ; 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 D = T on T . 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 D = T on * f r T s * f r ; 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 f r = 1000 T s ; D=0.001T then Onf r
Embodiment 3, 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 and compare signal with sky, 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 voltage controlled oscillator or frequency-modulated generator.Simultaneously, but corresponding configuration micro computer is also measured with the method for software.
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 D = T on T . 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 D = T on * f r T * f r ; 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 f r = 1000 T s ; D=0.001T then Onf r
In addition, the method that also can adopt voltage to transform is measured.Even use a dutycycle D = T on T s , 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.
CN 200510017342 2005-01-25 2005-01-25 Automatic measuring and displaying method for duty ratio Pending CN1811473A (en)

Priority Applications (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

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

Publications (1)

Publication Number Publication Date
CN1811473A true CN1811473A (en) 2006-08-02

Family

ID=36844512

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200510017342 Pending CN1811473A (en) 2005-01-25 2005-01-25 Automatic measuring and displaying method for duty ratio

Country Status (1)

Country Link
CN (1) CN1811473A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
CN102012494B (en) Transformer calibrator and calibration method thereof
CN203909138U (en) General three-phase AC signal synchronous sampling device
US4975634A (en) Jitter measurement device
CN214895514U (en) PWM control sequential sampling period transient frequency measuring circuit
CN1811473A (en) Automatic measuring and displaying method for duty ratio
CN105699738A (en) PWM-based AC signal effective value measurement method
CA2011661A1 (en) Jitter measurement device
CN102495250A (en) Quasi-synchronous wideband reactive energy meter based on Hilbert algorithm and sampling method thereof
CN114252837A (en) High-precision equal sampling system and method for harmonic measurement of digital power meter
CN111736049B (en) Generator for simulating partial discharge signal
CN203950131U (en) A kind of high precision time interval measurement device based on FPGA
CN112505410A (en) PWM control sequential sampling period transient frequency measuring circuit
CN102707106B (en) Electric power subharmonic digital signal source
US10132663B2 (en) Self-calibrating linear voltage differential transformer demodulator
CN208109250U (en) A kind of Poul Dorset Sheep device of the amplitude of high-frequency vibration a little and frequency
CN102721861A (en) Alternating current power measurement method
CN107515332B (en) Direct current electric energy metering device and method based on frequency spectrum analysis and synchronous sampling
Yu et al. A control system of three-axis stepper motor based on the FPGA
CN214845733U (en) Remote calibration system for voltage source
CN209017015U (en) A kind of adjustable pulse counting equipment of output elementary errors
Haokai et al. Research on inverter control system based on bipolar and asymmetric regular sampled SPWM
CN203909262U (en) Device for verifying intelligent electronic mutual inductor based on IEC61850
CN204065387U (en) A kind of synchronous demodulator and comprise the power standard source of this synchronous demodulator
CN207081775U (en) A kind of circuit for measuring network phase shift parameters
CN201083813Y (en) Electric motor intelligence test apparatus

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C12 Rejection of a patent application after its publication
RJ01 Rejection of invention patent application after publication