CN205921567U - Sawtooth wave produces circuit - Google Patents
Sawtooth wave produces circuit Download PDFInfo
- Publication number
- CN205921567U CN205921567U CN201620779682.5U CN201620779682U CN205921567U CN 205921567 U CN205921567 U CN 205921567U CN 201620779682 U CN201620779682 U CN 201620779682U CN 205921567 U CN205921567 U CN 205921567U
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- China
- Prior art keywords
- operational amplifier
- signal
- square
- sawtooth
- sawtooth wave
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- 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.)
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Abstract
The utility model discloses a sawtooth wave produces circuit, include: little the control unit, bleeder circuit, first resistance, feedback resistance, an operational amplifier and integrating circuit, through little the control unit produce with required sawtooth wave signal same frequency's a square signal, then convert a square signal to the 2nd square signal that positive negative level absolute value equals through an operational amplifier and peripheral circuit, the second last square signal obtains the required sawtooth wave signal that positive negative level absolute value equals through integrating circuit. Can know from this, compare with traditional hardware scheme, the utility model discloses the frequency of the sawtooth wave signal that produces is by little the control unit control, not only accurate but also can adjust, compare with traditional software scenario, the utility model discloses can obtain positive negative level absolute value and equal the sawtooth wave signal, the signal that just produces in the whole circuit is analog signal, consequently need not to add DA conversion chip, and whole circuit structure is simple to the cost has been practiced thrift.
Description
Technical field
This utility model is related to sawtooth waveforms technical field, in particular, is related to a kind of sawtooth wave generating circuit.
Background technology
Traditional sawtooth wave generating circuit integrating circuit group not etc. typically by hysteresis comparator and charge and discharge electrical time constant
Become, the frequency needs of the sawtooth waveforms that this hardware plan obtains are adjusted jointly by the resistance in hysteresis comparator and integrating circuit and electric capacity
Section obtains.Obtain the sawtooth waveforms of precise frequency if necessary it is necessary to configure resistance and the electric capacity of multiple numerical value, but actually used
Resistance and the numerical value of electric capacity be all some standard figureses, not continually varying numerical value, the saw of precise frequency therefore to be obtained
Tooth ripple is it is necessary to the calculating of large amount of complex, and is also difficult to configure relevant parameter.In addition, when traditional sawtooth wave generating circuit
After determination, the frequency of the sawtooth waveforms of generation is just fixed, and can not adjust, and in control system system, not only needs accurate frequency
The sawtooth waveforms of rate, and sometimes also need to the frequency-adjustable of sawtooth waveforms, therefore, traditional hardware plan is difficult to meet and requires.
The scheme of another kind of common generation sawtooth waveforms is to produce sawtooth waveforms by software algorithm, and this software scenario can produce
The sawtooth waveforms of raw precise frequency, and the frequency-adjustable of sawtooth waveforms, however it is necessary that configuration da conversion chip, digital signal are changed
Become analog signal output, and da conversion chip typically can only export the analogue signal of positive level, to obtain positive negative level simultaneously
Analogue signal in addition it is also necessary to add the circuit such as operational amplification circuit so that integrated circuit becomes complicated, cost increase.
Utility model content
In view of this, this utility model discloses a kind of sawtooth wave generating circuit, to realize reducing the same of circuit complexity
When, the sawtooth signal that frequency is accurate and can adjust can be obtained.
A kind of sawtooth wave generating circuit, comprising:
For producing the micro-control unit of frequency and frequency identical first square-wave signal of required sawtooth signal, institute
The high level stating the first square-wave signal is positive level, and low level is 0v；
The bleeder circuit that input is connected with reference voltage, the earth terminal ground connection of described bleeder circuit；
First resistor；
Feedback resistance；
First operational amplifier, the homophase import and export end of described first operational amplifier connects the defeated of described micro-control unit
Go out end, the inverting input of described first operational amplifier connects the outfan of described bleeder circuit by described first resistor,
The outfan of described first operational amplifier passes through described feedback resistance and connects described inverting input, described first operation amplifier
The outfan of device is used for the second square wave that output is converted to by described first square-wave signal that described micro controller unit exports
Signal, the high level of described second square-wave signal is positive level, and low level is negative level, and described positive level and described negative level
Absolute value equal；
Input is connected with the outfan of described first operational amplifier, for being just converted into described second square-wave signal
The integrating circuit of the equal described sawtooth signal of negative level absolute value.
Preferably, described integrating circuit includes: diode, second resistance, integrating condenser and the second operational amplifier；
The anode of described diode connects the outfan of described first operational amplifier, and the negative electrode of described diode connects institute
State the inverting input of the second operational amplifier；
Described second resistance is connected in the two ends of described diode in parallel；
One end of described integrating condenser connects the inverting input of described second operational amplifier, described capacitor another
One end connects the outfan of described second operational amplifier；
The in-phase input end of described second operational amplifier connects earth terminal, and the outfan of described second operational amplifier is used
In the described sawtooth signal of output.
Preferably, described bleeder circuit includes:
It is connected in series in the first partial pressure branch road between described reference voltage and ground and the second partial pressure branch road, described first point
The common port of pressure branch road and described second partial pressure branch road, as the outfan of described partial pressure branch road, is connected with described first resistor.
Preferably, described first partial pressure branch road includes a resistance or multiple resistance being connected in series.
Preferably, described second partial pressure branch road includes a resistance or multiple resistance being connected in series.
Preferably, also include: be connected in series in the 3rd between described micro-control unit and described first operational amplifier
Resistance.
Preferably, described micro-control unit is fpga.
Preferably, described micro-control unit is dsp processor.
It can be seen from above-mentioned technical scheme that, the utility model discloses a kind of sawtooth wave generating circuit, comprising: micro-control
Unit processed, bleeder circuit, first resistor, feedback resistance, the first operational amplifier and integrating circuit, are produced by micro-control unit
With the first square-wave signal of required sawtooth signal same frequency, then pass through the first operational amplifier and its peripheral circuit by the
One square-wave signal is converted into the second equal square-wave signal of positive negative level absolute value, and the integrated circuit of the second last square-wave signal obtains
To the equal required sawtooth signal of positive negative level absolute value.It follows that compared with traditional hardware plan, this utility model
The frequency of the sawtooth signal producing by micro-control unit controls, not only accurately but also can adjust；With traditional software side
Case is compared, and this utility model can obtain the signal producing in the equal sawtooth signal of positive negative level absolute value, and whole circuit
It is analogue signal, therefore need not add da conversion chip, whole circuit structure is simple, thus having saved cost.
Brief description
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or in description of the prior art the accompanying drawing of required use be briefly described it should be apparent that, drawings in the following description are only
It is embodiment of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawings can be obtained according to disclosed accompanying drawing.
Fig. 1 is a kind of circuit diagram of sawtooth wave generating circuit disclosed in this utility model embodiment；
Fig. 2 is a kind of waveform diagram of the square-wave signal of fpga output disclosed in this utility model embodiment；
Fig. 3 is that disclosed in this utility model embodiment, a kind of waveform of the square-wave signal of the first operational amplifier output is illustrated
Figure；
Fig. 4 is a kind of waveform diagram of the second opamp-output signal disclosed in this utility model embodiment；
Fig. 5 is the circuit diagram of another kind of sawtooth wave generating circuit disclosed in this utility model embodiment.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely description is it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of making creative work
The every other embodiment being obtained, broadly falls into the scope of this utility model protection.
This utility model embodiment discloses a kind of sawtooth wave generating circuit, to realize reducing the same of circuit complexity
When, the sawtooth signal that frequency is accurate and can adjust can be obtained.
Referring to Fig. 1, a kind of circuit diagram of sawtooth wave generating circuit disclosed in this utility model embodiment, this circuit includes:
Micro-control unit (microcontroller unit, mcu) 11, bleeder circuit 12, first resistor r1, feedback resistance r2, first
Operational amplifier 13 and integrating circuit 14.
Wherein,
Mcu11 is used for producing frequency identical first square-wave signal of frequency and required sawtooth signal, the first square wave
The high level of signal is positive level (such as 3.3v), and low level is 0v.
It should be noted that due to mcu11 produce the frequency of the first square-wave signal and the frequency of required sawtooth signal
Rate is identical, therefore, can change the frequency of required sawtooth signal by mcu11.Further, since mcu11 can produce appointing
First square-wave signal of meaning frequency, therefore compares traditional hardware plan, this utility model can ensure that sawtooth signal frequency
Precision.
The input of bleeder circuit 12 is connected with reference voltage vf, the earth terminal ground connection of bleeder circuit 12.
The homophase import and export end of the first operational amplifier 13 connects the outfan of mcu11, the first operational amplifier 13 anti-
Phase input connects bleeder circuit 12 by first resistor r1, and the outfan of the first operational amplifier 13 passes through feedback resistance r2 even
Connect inverting input, the outfan of the first operational amplifier 13 is used for output to be changed by the first square-wave signal that mcu11 exports
The second square-wave signal arriving, the high level of this second square-wave signal is positive level, and low level is negative level, and positive level and negative electricity
Flat absolute value is equal.
Wherein, when the difference of the absolute value of the positive negative level of the second square-wave signal is less than preset difference value, it is also contemplated that should
The absolute value of positive negative level is equal.
It should be noted that the absolute value of positive negative level of the second square-wave signal of the first operational amplifier 13 output is big
Little, obtained by the resistance adjusting bleeder circuit 12, first resistor r1 and feedback resistance r2.
The input of integrating circuit 14 is connected with the outfan of the first operational amplifier 13, and integrating circuit 14 is used for second
Square-wave signal is converted into the equal sawtooth signal of positive negative level absolute value.
In summary, sawtooth wave generating circuit disclosed in this utility model, is produced and required sawtooth signal by mcu11
First square-wave signal of same frequency, then passes through the first operational amplifier 13 and its first square-wave signal is changed by peripheral circuit
Become the second equal square-wave signal of positive negative level absolute value, it is exhausted that the integrated circuit of the second last square-wave signal 14 obtains positive negative level
The required sawtooth signal equal to value.It follows that compared with traditional hardware plan, the sawtooth waveforms that this utility model produces
The frequency of signal by mcu11 control, not only accurately but also can adjust；Compared with traditional software scenario, this utility model
The signal that can obtain producing in the equal sawtooth signal of positive negative level absolute value, and whole circuit is analogue signal, therefore
Da conversion chip need not be added, and whole circuit structure is simple, thus having saved cost.
Wherein, mcu11 can be replaced by the controller that other can produce optional frequency square-wave signal, for example, fpga
(field-programmable gate array, field programmable gate array), dsp (digital signal
Processing, Digital Signal Processing) processor etc..
In above-described embodiment, integrating circuit 14 specifically includes: diode d1, second resistance r3, integrating condenser c1 and
Two operational amplifiers 15.
Wherein, the annexation of each ingredient of integrating circuit 14 is specific as follows:
The anode of diode d1 connects the outfan of the first operational amplifier 13, and the negative electrode of diode d1 connects the second computing
The inverting input of amplifier 15；
Second resistance r3 is connected in the two ends of diode d1 in parallel；
One end of integrating condenser c1 connects the inverting input of the second operational amplifier 15, and integrating condenser c1's is another
End connects the outfan of the second operational amplifier 15；
The in-phase input end of the second operational amplifier 15 connects earth terminal, and the outfan of the second operational amplifier 15 is for defeated
Go out sawtooth signal.
The operation principle of integrating circuit 14 is:
When the first operational amplifier 13 exports negative level-vzWhen, negative level-vzThrough second resistance r3 to integrating condenser c1
Charge, integration time constant τ=r3 c1, the output voltage v of the second operational amplifier 15 now02Increase by linear rule,
As output voltage v02During equal to power supply positive voltage, output voltage v02Stop increasing；
When the first operational amplifier 13 exports positive level+vzWhen, positive level+vzThrough diode d1 to integrating condenser c1
Reverse charging, due to the forward resistance very little of diode d1, so integration time constant now becomes especially little, integrating capacitor
Device c1 quickly completes reverse charging, the output voltage v of the second operational amplifier 1502Become power supply negative electricity from power supply positive voltage rapidly
Pressure.So repeatedly, the second operational amplifier 15 exports a series of sawtooth signal.
Therefore, sawtooth wave generating circuit disclosed in this utility model can obtain frequency accurate and adjustable sawtooth waveforms letter
Number, the positive voltage peak of the sawtooth signal finally giving is the power supply positive voltage of the second operational amplifier 15, sawtooth signal
Negative voltage peak be the second operational amplifier 15 power supply negative voltage.
Equal for verifying that sawtooth wave generating circuit disclosed in this utility model can obtain positive negative level absolute value further
Sawtooth signal, this utility model verified to this sawtooth wave generating circuit also by oscillograph.
The waveform diagram of the square-wave signal exporting referring to Fig. 2, a kind of fpga disclosed in this utility model embodiment, its
In, this square-wave signal is 10kh for frequencyz, dutycycle be 5% square-wave signal, high level be 3.3v, low level be 0v.
Referring to Fig. 3, a kind of waveform of the square-wave signal of the first operational amplifier output disclosed in this utility model embodiment
Schematic diagram, wherein, the square-wave signal of the first operational amplifier 13 output is obtained by after the square-wave signal conversion of fpga output in Fig. 2
Arrive, as can be known from Fig. 3, the frequency of the square-wave signal of the first operational amplifier 13 output is similarly 10khzBut, this square-wave signal
High level become 4.4v, low level becomes -4.6v.It follows that the high level that fpga is produced by the first operational amplifier 13
For 3.3v, low level is that the square-wave signal of 0v is converted to high level for 4.4v, and low level is the square-wave signal of -4.6v.
Referring to Fig. 4, a kind of waveform diagram of the second opamp-output signal disclosed in this utility model embodiment,
Figure 4, it is seen that the square-wave signal of the first operational amplifier 13 output is through the second operational amplifier 15 and its peripheral circuit
After process, sawtooth signal can be obtained, the frequency of this sawtooth signal is 10khz, positive negative level absolute value is equal, and waveform
Preferably, can be good at meeting design requirement.
For optimizing Fig. 1 disclosed embodiment further, bleeder circuit 12 specifically includes:
It is connected in series in the first partial pressure branch road between reference voltage vf and ground and the second partial pressure branch road, described first partial pressure
The common port of branch road and described second partial pressure branch road, as the outfan of partial pressure branch road 12, is connected with first resistor r1.
Wherein, the first partial pressure branch road can include a resistance (r4 in such as Fig. 1) or multiple electricity being connected in series
Resistance.
Equally, the second partial pressure branch road can include a resistance (r5 in such as Fig. 1) or multiple electricity being connected in series
Resistance.
Referring to Fig. 5, a kind of circuit diagram of sawtooth wave generating circuit disclosed in another embodiment of this utility model, in Fig. 1 institute
On the basis of showing embodiment, also include: be connected in series in 3rd resistor r6 between mcu11 and the first operational amplifier 13.
It should be noted that 3rd resistor r6 is used for eliminating the error originated from input of the first operational amplifier 13.
Last in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation are made a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.And, term " inclusion ", "comprising" or its any other variant meaning
Covering comprising of nonexcludability, so that including a series of process of key elements, method, article or equipment not only include that
A little key elements, but also include other key elements being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element being limited by sentence "including a ...", does not arrange
Remove and also there is other identical element in the process including described key element, method, article or equipment.
In this specification, each embodiment is described by the way of going forward one by one, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or new using this practicality
Type.Multiple modifications to these embodiments will be apparent from for those skilled in the art, is determined herein
The General Principle of justice can be realized in the case of without departing from spirit or scope of the present utility model in other embodiments.Cause
This, this utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The wide scope consistent with features of novelty.
Claims (8)
1. a kind of sawtooth wave generating circuit is it is characterised in that include:
For producing the micro-control unit of frequency identical first square-wave signal of frequency and required sawtooth signal, described the
The high level of one square-wave signal is positive level, and low level is 0v；
The bleeder circuit that input is connected with reference voltage, the earth terminal ground connection of described bleeder circuit；
First resistor；
Feedback resistance；
First operational amplifier, the homophase import and export end of described first operational amplifier connects the output of described micro-control unit
End, the inverting input of described first operational amplifier connects the outfan of described bleeder circuit, institute by described first resistor
The outfan stating the first operational amplifier passes through the described feedback resistance described inverting input of connection, described first operational amplifier
Outfan be used for output by described first square-wave signal that described micro controller unit exports be converted to second square wave letter
Number, the high level of described second square-wave signal is positive level, and low level is negative level, and described positive level and described negative level
Absolute value is equal；
Input is connected with the outfan of described first operational amplifier, for described second square-wave signal is converted into positive negative electricity
The integrating circuit of the equal described sawtooth signal of flat absolute value.
2. sawtooth wave generating circuit according to claim 1 is it is characterised in that described integrating circuit includes: diode,
Two resistance, integrating condenser and the second operational amplifier；
The anode of described diode connects the outfan of described first operational amplifier, and the negative electrode of described diode connects described the
The inverting input of two operational amplifiers；
Described second resistance is connected in the two ends of described diode in parallel；
One end of described integrating condenser connects the inverting input of described second operational amplifier, the other end of described capacitor
Connect the outfan of described second operational amplifier；
The in-phase input end of described second operational amplifier connects earth terminal, and the outfan of described second operational amplifier is for defeated
Go out described sawtooth signal.
3. sawtooth wave generating circuit according to claim 1 is it is characterised in that described bleeder circuit includes:
It is connected in series in the first partial pressure branch road between described reference voltage and ground and the second partial pressure branch road, described first partial pressure is propped up
The common port of road and described second partial pressure branch road, as the outfan of described partial pressure branch road, is connected with described first resistor.
4. sawtooth wave generating circuit according to claim 3 is it is characterised in that described first partial pressure branch road includes an electricity
Resistance or multiple resistance being connected in series.
5. sawtooth wave generating circuit according to claim 3 is it is characterised in that described second partial pressure branch road includes an electricity
Resistance or multiple resistance being connected in series.
6. sawtooth wave generating circuit according to claim 1 is it is characterised in that also include: is connected in series in described micro-control
3rd resistor between unit processed and described first operational amplifier.
7. sawtooth wave generating circuit according to claim 1 is it is characterised in that described micro-control unit is fpga.
8. sawtooth wave generating circuit according to claim 1 is it is characterised in that described micro-control unit is dsp processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620779682.5U CN205921567U (en) | 2016-07-22 | 2016-07-22 | Sawtooth wave produces circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620779682.5U CN205921567U (en) | 2016-07-22 | 2016-07-22 | Sawtooth wave produces circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205921567U true CN205921567U (en) | 2017-02-01 |
Family
ID=57873850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620779682.5U Withdrawn - After Issue CN205921567U (en) | 2016-07-22 | 2016-07-22 | Sawtooth wave produces circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN205921567U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130512A (en) * | 2016-07-22 | 2016-11-16 | 珠海格力电器股份有限公司 | A kind of sawtooth wave generating circuit |
| CN109741570A (en) * | 2019-01-23 | 2019-05-10 | 福建师范大学 | A kind of flame detector signal processing circuit |
-
2016
- 2016-07-22 CN CN201620779682.5U patent/CN205921567U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130512A (en) * | 2016-07-22 | 2016-11-16 | 珠海格力电器股份有限公司 | A kind of sawtooth wave generating circuit |
| CN106130512B (en) * | 2016-07-22 | 2023-07-21 | 珠海格力电器股份有限公司 | Sawtooth wave generating circuit |
| CN109741570A (en) * | 2019-01-23 | 2019-05-10 | 福建师范大学 | A kind of flame detector signal processing circuit |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170201 Effective date of abandoning: 20230721 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170201 Effective date of abandoning: 20230721 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |