CN102170281B - Device and method for fast demodulating low-frequency pulse width modulation signal - Google Patents
Device and method for fast demodulating low-frequency pulse width modulation signal Download PDFInfo
- Publication number
- CN102170281B CN102170281B CN201110024342.3A CN201110024342A CN102170281B CN 102170281 B CN102170281 B CN 102170281B CN 201110024342 A CN201110024342 A CN 201110024342A CN 102170281 B CN102170281 B CN 102170281B
- Authority
- CN
- China
- Prior art keywords
- frequency
- pulse width
- unit period
- width modulation
- low
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 27
- 230000001360 synchronised effect Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 15
- 230000010354 integration Effects 0.000 claims description 15
- 238000000605 extraction Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 239000000284 extract Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Images
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
The invention discloses a device for fast demodulating a low-frequency pulse width modulation signal. The device comprises a phase-locked loop circuit (100) and a synchronous extracting circuit (200), wherein the phase-locked loop circuit (100) comprises a phase discriminator (1), a loop filter (2), a voltage-controlled oscillator (3) and a frequency divider (4) which are connected with one another in turn and form a closed loop; the synchronous extracting circuit (200) comprises a unit period integrator (5) and a sampling holder (6) which are connected with each other in turn; the frequency divider (4) is respectively connected with the unit period integrator (5) and the sampling holder (6); and a connecting line between the frequency divider (4) and the phase discriminator (1) is connected with the unit period integrator (5). The invention also discloses a method for fast demodulating the low-frequency pulse width modulation signal by using the device. By using the method for fast demodulating the low-frequency pulse width modulation signal, disclosed by the invention, pulse width information of a low-frequency pulse width modulation signal of 50 Hz and 60 Hz or 100 Hz and 120 Hz can be fast extracted.
Description
Technical field
The invention belongs to electronic technology field, relate to pulse-width signal demodulation.More particularly, the present invention relates to a kind of quick low-frequency pulse width modulation signal demodulation method of new high-performance low price.
Background technology
In illuminator, especially, in LED illuminator, requirement of light regulation has become a basic demand.Its dim signal normally transmits in pulse-width signal mode, for example, and the controllable silicon dimmer of conventional incandescent lamp.Controllable silicon dimmer transmits 50 hertz of low frequencies or 60 hertz determines the alternating signal of frequency, and its pulsewidth is to change with the angle of flow of controllable silicon dimmer, that is to say the given controlling value of its pulsewidth reflection controllable silicon dimmer.How extracting this pulse width information of determining the low-frequency pulse width modulation signal of frequency has some ready-made methods, but has the problem in application.As shown in Figure 1, for a low-frequency pulse width modulation signal, its frequency spectrum is made up of with its fundamental frequency and high order harmonic component the DC component of its corresponding pulsewidth.The specifically output for controllable silicon dimmer, its fundamental frequency is 50,60 hertz or 100,120 hertz.On frequency domain, 50,60 hertz or 100,120 hertz of very close DC component (zero hertz) of fundamental frequencies.Extract the DC component in this low-frequency pulse width modulation signal, this needs the very low pass filter of arrowband to carry out its fundamental frequency of filtering, i.e. 50,60 hertz or 100,120 hertz and all high order harmonic components.From the characteristic of low pass filter, the dynamic responding speed of its low pass filter is to be directly proportional to its bandwidth, that is, the bandwidth of low pass filter is narrower, and its dynamic responding speed is slower.
In actual applications, normally hope is when the controlling value of controllable silicon dimmer is after artificial change, and its corresponding illuminator should be able to promptly change the effect of its corresponding brightness with the corresponding controlling value of feedback controllable silicon dimmer.If the pulse width information of 50,60 hertz of low frequencies or 100,120 hertz of pulse-width signals is to be extracted by the unusual low pass filter of arrowband, pulse width information needs considerable time to extract, and can not promptly change its corresponding brightness to feed back the effect of corresponding controlling value of this controllable silicon dimmer so its corresponding illuminator has the hysteresis of long duration.Obviously the pulse width information that adopts narrowband low-pass filter to extract 50,60 hertz of low frequencies or 100,120 hertz of pulse-width signals can not meet the requirement of practical application.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of quick low-frequency pulse width modulation signal demodulation method of new high-performance low price, and it can extract the pulse width information of 50,60 hertz of low frequencies or 100,120 hertz of pulse-width signals rapidly.
In order to solve the problems of the technologies described above, the invention provides a kind of low-frequency pulse width modulation signal demodulating equipment fast: comprise phase-locked loop circuit and synchronous extraction circuit; Phase-locked loop circuit comprises the phase discriminator, loop filter, voltage controlled oscillator and the frequency divider that are connected successively and form closed loop; Synchronous extraction circuit comprises successively connected unit period integrator and sampling holder; Frequency divider is connected with sampling holder with unit period integrator respectively, and the line between frequency divider and phase discriminator is connected with unit period integrator.
Improvement as quick low-frequency pulse width modulation signal demodulating equipment of the present invention: unit period integrator is combined by the output signal of the frequency divider in switched-capacitor integrator and phase-locked loop circuit; The integral constant of switched-capacitor integrator is proportional to corresponding unit period.
The present invention also provides the quick low-frequency pulse width modulation signal demodulation method that utilizes said apparatus to carry out simultaneously: phase-locked loop circuit for generation of with determine frequency low-frequency pulse width modulation signal with the frequently square-wave signal of homophase and the square-wave signal of corresponding multiple frequency;
Determine frequency low-frequency pulse width modulation signal through unit period integrator integration in unit period; The output signal of unit period integrator is sampled retainer sampling in all end of term of unit period integration and keeps output, and the i.e. sampling taking d. c. voltage signal form as sampling holder of pulsewidth of determining frequency low-frequency pulse width modulation signal keeps output.
Whole circuit of the present invention can be divided into two parts: first phase-locked loop circuit, and it is by phase discriminator, loop filter, voltage controlled oscillator and frequency divider composition; It two is synchronous extraction circuits, and it is made up of unit period integrator and sampling holder.Phase-locked loop circuit be for generation of with determine frequency low-frequency pulse width modulation signal with the frequently square-wave signal of homophase and the square-wave signal of corresponding multiple frequency.Phase-locked loop circuit produce with determine frequency low-frequency pulse width modulation signal and can be combined with integrator and form unit period integrator with the frequently square-wave signal of homophase and the square-wave signal of corresponding multiple frequency.Unit period integrator is to make the integral constant of this integrator be proportional to the cycle of unit period integration,, determines the cycle of pulse-width signal frequently that is.
Determine frequency low-frequency pulse width modulation signal through this unit period integrator integration in unit period.Its output signal is sampled retainer sampling in all end of term of unit period integration and keeps output, and this i.e. sampling taking d. c. voltage signal form as sampling holder of pulsewidth of determining frequency low-frequency pulse width modulation signal keeps output.
Advantage of the present invention is not need low pass filter (although there is loop filter in phase-locked loop circuit, but when determining the square-wave signal frequency of the same frequency homophase that frequency low-frequency pulse width modulation signal frequency produces with phase-locked loop circuit when identical, the exporting change of this loop filter is quite little) just can extract the pulse width information of determining frequency low-frequency pulse width modulation signal.
Advantage of the present invention be it that can make the extracted pwm value of determining frequency low-frequency pulse width modulation signal after the cycle of a unit period integration, change, the pwm value information of determining frequency low-frequency pulse width modulation signal of, extracting only lags behind a pulse width signal cycle.
Advantage of the present invention is the dynamic responding speed of its demodulation method is extracted the pulse width information of 50,60 hertz of described low frequencies or 100,120 hertz of pulse-width signals dynamic responding speed much larger than employing narrowband low-pass filter.
Brief description of the drawings
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is the pulse width information scheme that existing narrowband low-pass filter is extracted 50,60 hertz of this low frequencies or 100,120 hertz of pulse-width signals.
Fig. 2 is the block diagram of quick low-frequency pulse width modulation signal demodulating equipment of the present invention.
Fig. 3 is the instantiation circuit diagram of quick low-frequency pulse width modulation signal demodulating equipment of the present invention.
Embodiment
The quick low-frequency pulse width modulation signal demodulation method instantiation circuit of high-performance low price of the present invention as shown in Figure 3.Whole circuit can be divided into two parts.First phase-locked loop circuit 100, it is made up of the phase discriminator 1, loop filter 2, voltage controlled oscillator 3 and the frequency divider 4 that are connected successively and form closed loop.It two is synchronous extraction circuits 200, and it is made up of interconnective unit period integrator 5 and sampling holder 6.Frequency divider 4 is connected with sampling holder 6 with unit period integrator 5 respectively.Unit period integrator 5 is combined by the output signal of the frequency divider 4 in switched-capacitor integrator and phase-locked loop circuit 100; The integral constant of switched-capacitor integrator is proportional to corresponding unit period.
The operation principle of phase-locked loop circuit 100 can be with reference to " Phase Lock Technique " (publishing house of Xian Electronics Science and Technology University, the 14th printing of 2006 publication times.ISBN 7-5606-0292-4/TN*0075 (class)).
Phase-locked loop circuit 100 be for generation of with determine frequency low-frequency pulse width modulation signal with the frequently square-wave signal of homophase and the square-wave signal of corresponding multiple frequency, as the switch periods signal of switched-capacitor integrator.The switch periods signal of switched-capacitor integrator is the frequency divider 4 of taking from phase-locked loop circuit 100.Can make the integral constant of switched-capacitor integrator be proportional to the cycle of this unit period integration, that is, determine the cycle of pulse-width signal frequently.Determine frequency low-frequency pulse width modulation signal through switched-capacitor integrator integration in unit period.The output signal of switched-capacitor integrator is sampled retainer 6 samplings in all end of term of unit period integration and keeps output, and this i.e. sampling taking d. c. voltage signal form as sampling holder 6 of pulsewidth of determining frequency low-frequency pulse width modulation signal keeps output.And this switched-capacitor integrator is reset to next unit period integration in all end of term of unit period integration and prepares.
Certainly sampling holder 6 sampling maintenances and switched-capacitor integrator reset and all need the time to complete.Time is much smaller than the cycle of unit period integration as required, and the error that sampling holder 6 samplings keep and switched-capacitor integrator resets to be caused can be in the scope of acceptance.Otherwise, the error being caused that some complicated circuits keep introducing with the sampling of solution sampling holder and switched-capacitor integrator resets.
In the quick low-frequency pulse width modulation signal demodulation method of high-performance low price of the present invention, owing to there is no low pass filter (although there is loop filter 2 in phase-locked loop circuit 100, but identical when determining the square-wave signal frequency of the same frequency homophase that frequency low-frequency pulse width modulation signal frequency produces with phase-locked loop circuit 100, the exporting change of loop filter 2 is quite little), this can change the pwm value of determining frequency low-frequency pulse width modulation signal that the quick low-frequency pulse width modulation signal demodulation method of high-performance low price of the present invention extracts after the cycle of a unit period integration, , the pwm value of determining frequency low-frequency pulse width modulation signal extracting only lags behind a pulse width signal cycle.Therefore in the dynamic responding speed of the quick low-frequency pulse width modulation signal demodulation method of high-performance low price of the present invention much larger than adopting narrowband low-pass filter to extract the dynamic responding speed of the pulse width information of 50,60 hertz of this low frequencies or 100,120 hertz of pulse-width signals.
Finally, it is also to be noted that, what more than enumerate is only a specific embodiment of the present invention.Obviously, the invention is not restricted to above embodiment, can also have many distortion.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (2)
1. a quick low-frequency pulse width modulation signal demodulating equipment, is characterized in that: comprise phase-locked loop circuit (100) and synchronous extraction circuit (200); Described phase-locked loop circuit (100) comprises the phase discriminator (1), loop filter (2), voltage controlled oscillator (3) and the frequency divider (4) that are connected successively and form closed loop; Described synchronous extraction circuit (200) comprises successively connected unit period integrator (5) and sampling holder (6); Frequency divider (4) is connected with sampling holder (6) with unit period integrator (5) respectively, and the line between frequency divider (4) and phase discriminator (1) is connected with unit period integrator (5);
Described unit period integrator (5) is combined by the output signal of the frequency divider (4) in switched-capacitor integrator and phase-locked loop circuit (100); The integral constant of switched-capacitor integrator is proportional to corresponding unit period.
2. the quick low-frequency pulse width modulation signal demodulation method that utilizes device as claimed in claim 1 to carry out, is characterized in that: phase-locked loop circuit (100) for generation of with determine frequency low-frequency pulse width modulation signal with the frequently square-wave signal of homophase and the square-wave signal of corresponding multiple frequency;
Determine frequency low-frequency pulse width modulation signal through unit period integrator (5) integration in unit period; The output signal of unit period integrator (5) is sampled retainer (6) sampling in all end of term of unit period integration and keeps output, determines the i.e. sampling of (6) the maintenance output taking d. c. voltage signal form as sampling holder of pulsewidth of frequency low-frequency pulse width modulation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110024342.3A CN102170281B (en) | 2011-01-24 | 2011-01-24 | Device and method for fast demodulating low-frequency pulse width modulation signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110024342.3A CN102170281B (en) | 2011-01-24 | 2011-01-24 | Device and method for fast demodulating low-frequency pulse width modulation signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102170281A CN102170281A (en) | 2011-08-31 |
| CN102170281B true CN102170281B (en) | 2014-06-04 |
Family
ID=44491281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110024342.3A Active CN102170281B (en) | 2011-01-24 | 2011-01-24 | Device and method for fast demodulating low-frequency pulse width modulation signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102170281B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091561B (en) * | 2012-12-26 | 2015-02-11 | 常州同惠电子股份有限公司 | Device obtaining direct current signals from alternative current and direct current superposition signals and method thereof |
| CN106907999B (en) * | 2017-05-04 | 2019-11-15 | 合肥工业大学 | A kind of grating sensor displacement measurement system based on phase-modulation |
| US10749717B2 (en) * | 2017-06-29 | 2020-08-18 | Analog Devices, Inc. | Demodulator for pulse-width modulated clock signals |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4906860A (en) * | 1987-11-16 | 1990-03-06 | Mitsubishi Denki Kabushiki Kaisha | Control device for active filter |
| US6181217B1 (en) * | 1999-07-14 | 2001-01-30 | Thomson Licensing S.A. | VCXO with reduced PWM effects high slew rate conditions |
| CN2720758Y (en) * | 2004-08-17 | 2005-08-24 | 惠州雷士工业发展有限公司 | Lamp light-regulation switch |
| CN101406013A (en) * | 2006-04-20 | 2009-04-08 | 松下电器产业株式会社 | Pulse transmitter, pulse receiver, pulse transmitting method, and pulse demodulating method |
-
2011
- 2011-01-24 CN CN201110024342.3A patent/CN102170281B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4906860A (en) * | 1987-11-16 | 1990-03-06 | Mitsubishi Denki Kabushiki Kaisha | Control device for active filter |
| US6181217B1 (en) * | 1999-07-14 | 2001-01-30 | Thomson Licensing S.A. | VCXO with reduced PWM effects high slew rate conditions |
| CN2720758Y (en) * | 2004-08-17 | 2005-08-24 | 惠州雷士工业发展有限公司 | Lamp light-regulation switch |
| CN101406013A (en) * | 2006-04-20 | 2009-04-08 | 松下电器产业株式会社 | Pulse transmitter, pulse receiver, pulse transmitting method, and pulse demodulating method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102170281A (en) | 2011-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102202448B (en) | Light dimming control device for light-emitting diode (LED) illumination | |
| CN104902648B (en) | A kind of LED light adjusting circuits and light-dimming method with controllable silicon | |
| US8552658B2 (en) | Light-emitting diode (LED) driver and controller | |
| CN101902854A (en) | Led controller and LED phase shift light adjusting circuit and correlation technique with phase-shift dimming function | |
| CN103347332B (en) | Signal processing method and circuit and the LED light adjusting circuits with the circuit | |
| CN106160414A (en) | The synchronization of pulsewidth modulation switching frequency has the switching power converter of improvement | |
| CN102238774A (en) | Method and device for acquiring conduction angle and light emitting diode (LED) driving method and device | |
| CN102170281B (en) | Device and method for fast demodulating low-frequency pulse width modulation signal | |
| US10199929B2 (en) | Transient event detector circuit and method | |
| CN103460059B (en) | A kind of power-measuring device | |
| CN102238773A (en) | LED (light-emitting diode) drive method and system | |
| BR112014015407B1 (en) | METHOD AND APPLIANCE BASED ON CIRCUITS TO RECEIVE DATA COMMUNICATION THROUGH POWER DISTRIBUTION LINES AND DEVICE | |
| CN102946254A (en) | Digital controller and digital control method of multiphase switching converter | |
| CN104184492A (en) | Method and apparatus for realizing composite communication of power and communication signals in electric power system | |
| CN103580523A (en) | Multipath phase-shift PWM wave generating circuit based on FPGA | |
| CN105680851A (en) | Clock data recovery system | |
| CN102347750A (en) | Clock following circuit and following method of clock circuit | |
| CN105027406B (en) | Impulse density D/A converter with slope-compensation function | |
| CN104883037A (en) | Multi-machine system and synchronization method | |
| CN109104783A (en) | Driving circuit and LED light including driving circuit | |
| TW202010358A (en) | Current control method and system of LED lamp | |
| US20200166911A1 (en) | Communication unit, control apparatus, field device, communication system and method | |
| CN203416231U (en) | Adaptive filtering circuit based on full-digital phase-locked loop and switched capacitor filter | |
| CN102801921B (en) | Bayonet camera | |
| CN208257698U (en) | A kind of contracting brake controller and traction machine based on PWM pulsewidth modulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191121 Address after: 221300, Fumin Road, Pizhou hi tech Industrial Development Zone, Xuzhou, Jiangsu, 22 Patentee after: Pizhou hi tech Zone New Energy Technology Research Institute Co., Ltd. Address before: 310012 Qixia garden, Guihua Road, two West Wen Road, Hangzhou, Zhejiang, Xihu District 13-1-102 Patentee before: Wei Qicui |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210308 Address after: 221300 No.56, paoche street, Pizhou City, Xuzhou City, Jiangsu Province Patentee after: Pizhou Jingpeng Venture Capital Co., Ltd Address before: 221300 22 Fu Min Road, hi tech Industrial Development Zone, Pizhou, Xuzhou, Jiangsu Patentee before: PIZHOU HIGH-TECH ZONE NEW ENERGY TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |