CN1794579A - Switching frequency period modulated sawteeth wave generating circuit - Google Patents
Switching frequency period modulated sawteeth wave generating circuit Download PDFInfo
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- CN1794579A CN1794579A CN 200610023249 CN200610023249A CN1794579A CN 1794579 A CN1794579 A CN 1794579A CN 200610023249 CN200610023249 CN 200610023249 CN 200610023249 A CN200610023249 A CN 200610023249A CN 1794579 A CN1794579 A CN 1794579A
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Abstract
This invention relates to a saw-tooth wave generation circuit for modulating switch frequency period composed of a modulation circuit and a saw tooth wave circuit, in which, the input of the modulation wave circuit is sine half-wave voltage and gets modulation wave voltage after the level is upgraded by a branch voltage circuit, a follow circuit and a DC bias component, the saw-tooth wave circuit inputs said modulation wave voltage to generate saw-tooth wave voltage signal via a charge and discharge circuit with the period modulated and a comparison circuit to be output by the voltage comparator, which generates saw-tooth wave voltage signal with the switch frequency varied along with the sine half-wave voltage period as the carrier signals to greatly reduce the magnetic interference intensity based on the theory of voltage-frequency conversion.
Description
Technical field
The present invention relates to a kind of saw-tooth wave generating circuit of switching frequency periodic modulation, relate in particular to a kind of switching frequency of Active Power Factor Correction (PFC), Active Power Filter-APF (APF) and Switching Power Supply active electric power electronic converters such as (SMPS) that is applicable to and press the saw-tooth wave generating circuit of half-sinusoid rule modulation, have application scenario very widely.
Background technology
Because the Technics of Power Electronic Conversion technology generally adopts high-frequency PWM (pulse width modulation) wave chopping technology, can produce high-intensity electromagnetic interference (EMI), and must be by relevant EMI test before the Technics of Power Electronic Conversion launch, as test events such as continuous disturbance radiation, radiation of power, the EMI design has accounted for a product important component part of design cost just, therefore suppresses the focus that the EMI interference source becomes present converters design.Conventional P WM wave chopping technology adopts the fixed switching frequency modulation scheme, in its high-frequency harmonic regularity of distribution, the integral multiple of switching frequency and the interference level of side frequency thereof are quite high, other regional interference level is lower, belong to the arrowband and distribute, make to be difficult to by quasi-peak value EMI and mean value EMI standard limited value at some spectral regions.Some new switching frequency modulation techniques have appearred for this reason, as switching frequency Stochastic Modulation, pulse position Stochastic Modulation, switching frequency dither technique etc., but utilize analogue device to realize very difficulty of above-mentioned technology, the cost height, reliability is not high yet, make these technology be applied as yet, therefore should seek switching frequency modulation technique simple and that the EMI inhibition is effective in the converters field.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, design provides a kind of saw-tooth wave generating circuit of switching frequency periodic modulation, has advantages such as simple in structure, with low cost, highly versatile, transplantability are strong.
For achieving the above object, the present invention is made of modulating wave circuit and sawtooth-wave circuit.The modulating wave circuit be input as half-sinusoid voltage, adding that the direct current biasing component obtains the modulating wave voltage after level promotes after handling through bleeder circuit and follow circuit.Sawtooth-wave circuit is imported this modulating wave voltage, produces the sawtooth voltage signal of frequency period modulation through charge-discharge circuit and comparison circuit, exports via voltage comparator.
Modulating wave circuit of the present invention is made of an electric capacity, eight resistance, three operational amplifiers, and two resistance series connection backs are in parallel with electric capacity, a termination half-sinusoid voltage of electric capacity, and the other end links to each other with ground; First operational amplifier connects into voltage follower, and its in-phase input end is connected with the common port of two series resistances; Second operational amplifier also connects into voltage follower, and its in-phase input end is through a divider resistance connection+15V power supply, simultaneously through another divider resistance ground connection; After the output of two operational amplifiers connects a resistance separately, be connected to the inverting input of the 3rd operational amplifier again through a resistance, the in-phase input end ground connection of the 3rd operational amplifier, connect a feedback resistance between its inverting input and the output, its output is connected to saw-tooth wave generating circuit.
Sawtooth-wave circuit of the present invention is by two electric capacity, five resistance, a technotron, two operational amplifiers and a voltage comparator constitute, wherein, the in-phase input end ground connection of the 5th operational amplifier, inverting input links to each other with the output of modulating wave circuit through a resistance, between inverting input and the output simultaneously and connect an electric capacity and a technotron, the output of the 5th operational amplifier connects the in-phase input end of the 4th operational amplifier, connect the in-phase input end of voltage comparator simultaneously through a resistance, the 4th operational amplifier connects into voltage follower; The inverting input of voltage comparator is through a divider resistance connection+15V power supply, simultaneously through another divider resistance ground connection, the output of voltage comparator links to each other with the gate pole of technotron, and, be connected an electric capacity between the in-phase input end of voltage comparator and the output through a grounding through resistance.
Four operational amplifiers in the entire circuit adopt single supply+15V power supply, and the 5th operational amplifier and voltage comparator adopt duplicate supply ± 15V power supply
The present invention is according to the voltage-frequency transfer principle of saw-tooth wave generating circuit, produce the sawtooth waveforms that switching frequency changes along with the modulating wave voltage cycle, can reduce the electromagnetic interference intensity of system greatly as carrier signal, it is good to have calibration result, features such as highly versatile, have simple in structure simultaneously, fringe cost is low, realize advantages such as easy, can also avoid utilizing the warbled burdensome task of realization random switching of microcontroller (MCU) or digital signal processor (DSP), be particularly useful for adopting the active power factor corrector (PFC) of PWM (pulse width modulation) control technology, Active Power Filter-APF (APF) and Switching Power Supply converters such as (SMPS).
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is applied to embodiment circuit theory diagrams in the single-phase active power factor corrector (PFC) for the present invention.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is further described.Following examples are to further specify of the present invention, and do not constitute limitation of the invention.
The saw-tooth wave generating circuit of the switching frequency periodic modulation of the present invention's design is made of modulating wave circuit 1 and sawtooth-wave circuit 2 as shown in Figure 1.Modulating wave circuit 1 is made up of three operational amplifier U1, U2 and U3, capacitor C 1, eight resistance R 1～R8, and electric capacity and resistance are connected on each pin of operational amplifier.Sawtooth-wave circuit 2 is made up of two operational amplifier U4 and U5, voltage comparator U6, two capacitor C 2 and C3, technotron T1, five resistance R 9～R13, and electric capacity and resistance are connected on each pin of operational amplifier and voltage comparator.
In the modulating wave circuit 1, resistance R 1 and resistance R 2 series connection backs are in parallel with capacitor C 1, a termination half-sinusoid voltage of capacitor C 1, and the other end links to each other with ground.Operational amplifier U1 connects into voltage follower, its in-phase input end is connected with the common port of two series resistance R1, R2, operational amplifier U2 also connects into voltage follower, and its in-phase input end is through a divider resistance R3 connection+15V power supply, simultaneously through another divider resistance R4 ground connection.The output of operational amplifier U1 connects resistance R 5, the output of operational amplifier U2 connects resistance R 6, the other end of R5 is with after the other end of R6 is connected, be connected to the inverting input of operational amplifier U3 again through a resistance R 7, connect a feedback resistance R8 between the inverting input of U3 and the output, the in-phase input end ground connection of U3, the output of U3 links to each other with an end of resistance R 9 in the sawtooth-wave circuit.Three operational amplifiers in the modulating wave circuit adopt single supply+15V power supply, and the pin 8 of U1, U2 and U3 all links to each other pin 4 equal ground connection with+15V power supply.
In the sawtooth-wave circuit 2, the in-phase input end ground connection of operational amplifier U5, inverting input links to each other through the output of resistance R 9 with the modulating wave circuit, between inverting input and the output simultaneously and meet a capacitor C 2 and a technotron T1, the in-phase input end of the output concatenation operation amplifier U4 of operational amplifier U5, connect the in-phase input end of voltage comparator U6 simultaneously through a resistance R 10, operational amplifier U4 connects into voltage follower; The inverting input of voltage comparator U6 is through a divider resistance R11 connection+15V power supply, simultaneously through another divider resistance R12 ground connection, the output of voltage comparator U6 links to each other with the gate pole of technotron T1, and, be connected a capacitor C 3 between the in-phase input end of voltage comparator U6 and the output through resistance R 13 ground connection.In the sawtooth-wave circuit, operational amplifier U4 adopts single supply+15V power supply, and operational amplifier U5 and voltage comparator U6 adopt duplicate supply ± 15V power supply.U4 links to each other with power supply+15V with the pin 8 of U6, the pin 4 of U5, pin 4 ground connection of U4 and U6, and the pin 7 of U5 links to each other with power supply-15V.
Operation principle of the present invention is:
(1) in the modulating wave circuit 1, capacitor C 1 plays the High frequency filter effect, and resistance R 1 constitutes bleeder circuit with R2, produces the half-sinusoid signal of suitable amplitude.Resistance R 3 constitutes bleeder circuit with R4, produces the dc level signal of suitable amplitude.Operational amplifier U1 and U2 are voltage follower, and itself and operational amplifier U3, resistance R 5, R6, R7 and R8 constitute add circuit amplifying circuit of holding concurrently, and realize the stack of half-sinusoid signal and dc level signal, produce final modulation wave signal.
(2) in the sawtooth-wave circuit 2, operational amplifier U5, resistance R 9, capacitor C 2 and technotron T1 constitute charging and quick discharging circuit, charge path is R9 and C2, discharge paths is made of T1, C2 is produced as high-pressure side near an end of U5 output during charging, the other end is a low-pressure end, be charged as linear-charging, voltage comparator U6 upset when C2 voltage is charged to certain numerical value, produce high level and force the T1 conducting, the electric charge of C2 is discharged rapidly, and the both end voltage that forces C2 forms a sawtooth waveforms near 0V.When the both end voltage of C2 was 0V, U6 overturn once more, T1 by, C2 restarts charging process.Provide the triggering signal of T1 to force C2 to charge again and again and discharge by U6 like this and just produced the sawtooth waveforms sequence.Voltage comparator is made up of C3, R10, R13, and R11 and R12 constitute the dividing potential drop branch road, and the upset level of C2 is provided.The final sawtooth voltage signal of output output of U5, by the voltage follower output that operational amplifier U4 constitutes, the pin 7 of U4 is the final signal output.
Saw-tooth wave generating circuit of the present invention is the voltage-frequency change-over circuit, on its input voltage, be superimposed with a half-sinusoid signal, thereby the frequency of the feasible sawtooth signal that produces changes along with the variation of half-sinusoid voltage, the too high frequency domain of harmonics level can not appear in its spectrum distribution, but the abundant expansion of frequency spectrum.Such sawtooth signal can reduce the EMI level of system as the modulation signal of converters.And because amplitude, DC level, the sawtooth waveforms amplitude of half-sinusoid voltage is all adjustable, it is adjustable to make that fundamental frequency, frequency change amplitude, the amplitude of sawtooth waveforms are, thereby makes the flexibility of its use improve.
Capacitor C 1～C3, resistance R 1～R13 are 5% above precision in the above-mentioned device, operational amplifier U1, U2 and U3 are LM324, U5 is LF356/LT, voltage comparator U6 is LM311, field effect transistor is 2N4391 or the close field effect transistor of function with it, and wherein U1 and U2, U3 and U4 respectively adopt a dual operational amplifier chip.Resistance R 3 provides a reference dc voltage with the R4 dividing potential drop, then the amplitude of the half-sinusoid voltage that obtains according to hope of the branch pressure request of resistance R 1 and the R2 percentage size that accounts for reference dc voltage come fixed.It is identical that resistance R 5, R6 and the resistance of R7 are selected, and the resistance of resistance R 8 is selected relevant according to multiplication factor.The selection of resistance R 9 and capacitor C 2 is according to the requirement of charge rate, and resistance R 11 is then decided according to the amplitude of sawtooth waveforms with the selection of R12.The parameter of one embodiment of the invention is: C1 gets 0.1nF～4.7 μ F, and C2 gets 2.2nF, and C3 gets 22pF, R1 gets 308.5k Ω, and R1 gets 2.5k Ω, and R3 gets 5k Ω, R4 gets 10k Ω, and R5 gets 1k Ω, and R6 gets 1k Ω, R7 gets 1k Ω, and R8 gets 1k Ω, and R9 gets 21k Ω, R10 gets 10k Ω, R11 gets 10k Ω, and R12 gets 5k Ω, and R13 gets 2k Ω.
Fig. 2 is the embodiment of saw-tooth wave generating circuit in single-phase active power factor corrector (PFC) of switching frequency periodic modulation of the present invention.
By shown in Figure 2, the input single phase alternating current (A.C.) voltage source of single-phase active power factor corrector, the rated voltage effective value is 220V, is made of power circuit and control circuit.Rectifier, inductance L 1, power switch S1, inspection leakage resistance Rs, fly-wheel diode FRD1, capacitor C 1, electrochemical capacitor E1 and the load R of its power circuit for constituting by diode D1～D4
LForm.Its control circuit is made up of the saw-tooth wave generating circuit of the two closed-loop control parts of PFC, pwm signal comparator, pwm driver and switching frequency periodic modulation of the present invention.The present invention just provides the saw-tooth wave generating circuit of a switching frequency according to the half-sinusoid voltage waveform rule variation of rectifier output in the application purpose of single-phase active power factor corrector, compare with the control signal that the two closed-loop controls of PFC partly produce as carrier signal, produce final pwm signal, and by acting on power switch S1 behind the driver, switch motion by S1, make the electric current of alternating-current voltage source and voltage fully synchronously and be sinusoidal waveform, make load end obtain high-precision direct voltage simultaneously.
Obviously, the saw-tooth wave generating circuit of switching frequency periodic modulation of the present invention can be applied in active power factor corrector (PFC), single-phase active electric-power filter (APF) and Switching Power Supply applications such as (SMPS), carrier signal is provided, plays the effect that reduces the converters EMI of system intensity.
Claims (2)
1, a kind of saw-tooth wave generating circuit of switching frequency periodic modulation, it is characterized in that comprising modulating wave circuit and sawtooth-wave circuit, described modulating wave circuit is by an electric capacity (C1), eight resistance (R1～R8), three operational amplifier (U1～U3) constitute, two resistance (R1, R2) series connection back is in parallel with electric capacity (C1), one termination half-sinusoid voltage of electric capacity (C1), the other end links to each other with ground; First operational amplifier (U1) connects into voltage follower, and its in-phase input end is connected with the common port of two series resistances (R1, R2); Second operational amplifier (U2) connects into voltage follower, and its in-phase input end is through a divider resistance (R3) connection+15V power supply, simultaneously through another divider resistance (R4) ground connection; After the output of two operational amplifiers (U1, U2) connects a resistance (R5, R6) separately, be connected to the inverting input of the 3rd operational amplifier (U3) again through a resistance (R7), the in-phase input end ground connection of the 3rd operational amplifier (U3), connect a feedback resistance (R8) between its inverting input and the output, its output is connected to saw-tooth wave generating circuit; Described sawtooth-wave circuit is by two electric capacity (C2, C3), five resistance (R9～R13), a technotron (T1), two operational amplifier (U4, U5), a voltage comparator (U6) constitutes, wherein, the in-phase input end ground connection of the 5th operational amplifier (U5), inverting input links to each other with the output of modulating wave circuit through a resistance (R9), between inverting input and the output simultaneously and connect an electric capacity (C2) and a technotron (T1), the output of the 5th operational amplifier (U5) connects the in-phase input end of the 4th operational amplifier (U4), connect the in-phase input end of voltage comparator (U6) simultaneously through a resistance (R10), the 4th operational amplifier (U4) connects into voltage follower; The inverting input of voltage comparator (U6) is through a divider resistance (R11) connection+15V power supply, simultaneously through another divider resistance (R12) ground connection, the output of voltage comparator (U6) links to each other with the gate pole of technotron (T1), and, be connected an electric capacity (C3) between the in-phase input end of voltage comparator (U6) and the output through a resistance (R13) ground connection; (U1～U4) adopt single supply+15V power supply, the 5th operational amplifier (U5) and voltage comparator (U6) adopt duplicate supply ± 15V power supply to four operational amplifiers in the entire circuit.
2, a kind of application of saw-tooth wave generating circuit of switching frequency periodic modulation of claim 1, it is characterized in that being used in the control circuit of power factor corrector, single-phase active electric-power filter or Switching Power Supply, as the carrier signal source in the control circuit, play the effect that reduces electromagnetic interference intensity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610023249 CN1794579A (en) | 2006-01-12 | 2006-01-12 | Switching frequency period modulated sawteeth wave generating circuit |
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| CN 200610023249 CN1794579A (en) | 2006-01-12 | 2006-01-12 | Switching frequency period modulated sawteeth wave generating circuit |
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| CN 200610023249 Pending CN1794579A (en) | 2006-01-12 | 2006-01-12 | Switching frequency period modulated sawteeth wave generating circuit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101977041A (en) * | 2010-10-15 | 2011-02-16 | 北京联合大学生物化学工程学院 | Sawtooth wave generating circuit with self-adjusting amplitude, period and duty ratio |
| CN102457236A (en) * | 2010-10-29 | 2012-05-16 | 贵州华阳电工有限公司 | Diverging and amplifying circuit with single power supply |
| CN101764511B (en) * | 2009-12-25 | 2013-01-16 | 天津诺尔哈顿电器制造有限公司 | Pulse width modulation signal voltage converting circuit |
| CN101626225B (en) * | 2008-06-23 | 2014-03-19 | 三星电子株式会社 | Sawtooth wave generating circuit and switch mode power supply having the same |
| CN106330146A (en) * | 2016-08-10 | 2017-01-11 | 上海交通大学 | Carrier generation circuit for pulse frequency modulation |
| CN106452392A (en) * | 2016-10-14 | 2017-02-22 | 成都前锋电子仪器有限责任公司 | Sawtooth wave generating circuit |
| CN111082659A (en) * | 2019-11-18 | 2020-04-28 | 合肥华耀电子工业有限公司 | Novel closed loop regulating circuit who possesses frequency modulation function |
| CN112583384A (en) * | 2020-11-27 | 2021-03-30 | 凯迈（洛阳）测控有限公司 | High-frequency sawtooth wave generator and working method thereof |
| CN113147434A (en) * | 2021-04-26 | 2021-07-23 | 深圳市优优绿能电气有限公司 | Circuit for automatically identifying address of charging module |
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2006
- 2006-01-12 CN CN 200610023249 patent/CN1794579A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101626225B (en) * | 2008-06-23 | 2014-03-19 | 三星电子株式会社 | Sawtooth wave generating circuit and switch mode power supply having the same |
| CN101764511B (en) * | 2009-12-25 | 2013-01-16 | 天津诺尔哈顿电器制造有限公司 | Pulse width modulation signal voltage converting circuit |
| CN101977041A (en) * | 2010-10-15 | 2011-02-16 | 北京联合大学生物化学工程学院 | Sawtooth wave generating circuit with self-adjusting amplitude, period and duty ratio |
| CN102457236A (en) * | 2010-10-29 | 2012-05-16 | 贵州华阳电工有限公司 | Diverging and amplifying circuit with single power supply |
| CN102457236B (en) * | 2010-10-29 | 2014-10-29 | 贵州华阳电工有限公司 | Diverging and amplifying circuit with single power supply |
| CN106330146B (en) * | 2016-08-10 | 2019-08-09 | 上海交通大学 | Carrier generating circuit for pulse frequency modulated |
| CN106330146A (en) * | 2016-08-10 | 2017-01-11 | 上海交通大学 | Carrier generation circuit for pulse frequency modulation |
| CN106452392A (en) * | 2016-10-14 | 2017-02-22 | 成都前锋电子仪器有限责任公司 | Sawtooth wave generating circuit |
| CN106452392B (en) * | 2016-10-14 | 2023-07-07 | 成都前锋电子仪器有限责任公司 | Sawtooth wave generating circuit |
| CN111082659A (en) * | 2019-11-18 | 2020-04-28 | 合肥华耀电子工业有限公司 | Novel closed loop regulating circuit who possesses frequency modulation function |
| CN112583384A (en) * | 2020-11-27 | 2021-03-30 | 凯迈（洛阳）测控有限公司 | High-frequency sawtooth wave generator and working method thereof |
| CN112583384B (en) * | 2020-11-27 | 2023-11-14 | 凯迈（洛阳）测控有限公司 | High-frequency sawtooth wave generator and working method thereof |
| CN113147434A (en) * | 2021-04-26 | 2021-07-23 | 深圳市优优绿能电气有限公司 | Circuit for automatically identifying address of charging module |
| CN113147434B (en) * | 2021-04-26 | 2022-02-01 | 深圳市优优绿能电气有限公司 | Circuit for automatically identifying address of charging module |
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