CN108777571A - A kind of signal generating circuit structure - Google Patents
A kind of signal generating circuit structure Download PDFInfo
- Publication number
- CN108777571A CN108777571A CN201810842171.7A CN201810842171A CN108777571A CN 108777571 A CN108777571 A CN 108777571A CN 201810842171 A CN201810842171 A CN 201810842171A CN 108777571 A CN108777571 A CN 108777571A
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- resistance
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- triode
- power supply
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- 238000007600 charging Methods 0.000 claims description 40
- 239000003990 capacitor Substances 0.000 claims description 34
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
- H03K4/50—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor
- H03K4/501—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g. by a comparator
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Details Of Television Scanning (AREA)
- Pulse Circuits (AREA)
Abstract
The present invention provides a kind of signal generating circuit structures, not only can effectively generate sawtooth signal, and can realize that the amplitude of sawtooth wave and frequency are adjustable, have a wide range of application, and have preferable practicability；It includes power supply, further includes the constant-current source circuit mechanism by the power supply power supply, to change the frequency of sawtooth wave；Amplitude com parison circuit mechanism, to change the amplitude of sawtooth wave；Latching circuit mechanism, to locking signal state.
Description
Technical field
The present invention relates to signal generation technology field, specially a kind of signal generating circuit structure.
Background technology
In circuit system, due to the needs of control, the signal generating circuit of usual indispensable various stabilizations, such as
In electric machines control technology or Switching Power Supply control technology, it will usually be modulated using pulse width（PWM）Controlling mechanism, and it is such
Pwm control signal can be obtained by signal shapings such as sawtooth waves, and the existing circuit solutions for generating sawtooth signal are mostly by 555
The circuit that timer is constituted obtains, but the amplitude adjustability very little of sawtooth wave generating circuit its sawtooth wave of 555 timers composition,
Mostly between 1/3VCC to 2/3VCC, the frequency of sawtooth wave is also non-adjustable, therefore application limitation is larger.
Invention content
Small for existing sawtooth wave generating circuit amplitude and frequency tunability, using big problem is limited to, the present invention provides
A kind of signal generating circuit structure, not only can effectively generate sawtooth signal, and can realize the amplitude and frequency of sawtooth wave
It is adjustable, have a wide range of application, there is preferable practicability.
Its technical solution is such：It includes power supply, it is characterised in that：It further includes the perseverance by the power supply power supply
Current source circuit mechanism, to change the frequency of sawtooth wave；
Amplitude com parison circuit mechanism, to change the amplitude of sawtooth wave；
Latching circuit mechanism, to locking signal state；
The constant-current source circuit mechanism includes PNP type triode Q1 ~ Q3, resistance R1 ~ R6, charging capacitor C1；
The amplitude com parison circuit mechanism includes comparator U1-A, U1-B, resistance R13 ~ R15；
The latching circuit mechanism includes comparator U1-C, triode Q4, Q5, resistance R7 ~ R12；
The collector of the triode Q1, which connect with the base stage of the triode Q2 and is connected with described resistance R1, R4, is followed by institute
Power supply is stated, the emitter connection of the base stage of the triode Q1 and the triode Q2 are followed by between described resistance R2, R3, institute
The collector for stating triode Q2 connect with the resistance R2 and is followed by the power supply, the emitter of the triode Q1 and three pole
One end connection of the collector, charging capacitor C1 of pipe Q3, the emitter of the triode Q3 are another with the charging capacitor C1's
End, the resistance R3 are grounded after being connected, and the base stage of the triode Q3 is separately connected one end of described resistance R5, R6, described
The other end of resistance R6 connects the power supply；
The negative input end of the comparator U1-B connect with the positive input terminal of the comparator U1-A after with the charging capacitor C1
One end connection, connect the resistance between the positive input terminal of the comparator U1-B and the negative input end of the comparator U1-A
R15, and the positive input terminal of the comparator U1-B connects the resistance R14 and is followed by the power supply, the comparator U1-A's is negative
Input terminal is grounded after connecting the resistance R13；
The comparator U1-B, the output end of comparator U1-C, the other end of resistance R5, triode Q5 base stage be connected,
The output end of the comparator U1-A, the base stage of triode Q4 are connected, collector and the resistance of described triode Q4, Q5
One end of R8, R12, which are connected, is followed by the power supply, and the other end of the resistance R8 is connected with one end of the resistance R9 to be followed by
In the negative input end of the comparator U1-C, and the negative input end of the comparator U1-C is grounded after the resistance R10, described
The other end of resistance R12 is connected with one end of the resistance R11 to be followed by the positive input terminal of the comparator U1-C, and the ratio
Positive input terminal compared with device U1-C is grounded after the resistance R7.
It is further characterized by：
Described triode Q4, Q5 hinder triode using positive-negative-positive band, and the model of described comparator U1-A, U1-B, U1-C are
LM339。
The invention has the advantages that the output signal of charging capacitor C1 is connected in amplitude com parison circuit mechanism, pass through
Compare the threshold values of charging capacitor C1 both end voltages and comparator U1-A, U1-B preset value and realize the charge and discharge of charging capacitor C1,
To which required sawtooth waveform can be obtained；And can according to circumstances regulation resistance R1, R4 resistance value size and/or charging capacitor
The size of C1 capacitances to change the frequency of sawtooth wave, and can be realized by adjusting the threshold voltage of comparator U1-A, U1-B
Change sawtooth wave amplitude, to not only can effectively generate sawtooth signal, and can realize that the amplitude of sawtooth wave and frequency are adjustable, answer
It is wide with range, there is preferable practicability.
Description of the drawings
Fig. 1 is the circuit diagram of constant-current source circuit mechanism；
Fig. 2 is the circuit diagram of amplitude com parison circuit mechanism；
Fig. 3 is the circuit diagram of latching circuit mechanism.
Specific implementation mode
Refer to the attached drawing and its description, to help comprehensive reason to various embodiments of the present invention defined by claim
Solution, it includes various specific details to help the understanding, but these details should be considered as only being exemplary；Correspondingly,
It will be appreciated by those of ordinary skill in the art that without departing substantially from the scope of the present invention defined by appended claims the case where
Under, changes and improvements can be made to various embodiments described herein, in addition, for clarity and brevity, may save
Slightly to the description of well known function and construction.
It will be apparent for a person skilled in the art that the following description to the embodiment of the present invention is provided, merely to
The purpose of explanation, rather than it is of the invention defined by appended claims in order to limit.
As shown in Figure 1, Figure 2, Figure 3 shows, the present invention includes power supply VCC and the constant-current source circuit machine powered by power supply VCC
Structure changes the frequency of sawtooth wave by adjusting charging current；Amplitude com parison circuit mechanism, to change the amplitude of sawtooth wave；From
Lock circuit mechanism, to locking signal state；Constant-current source circuit mechanism includes PNP type triode Q1 ~ Q3, resistance R1 ~ R6, charging
Capacitance C1；Amplitude com parison circuit mechanism includes comparator U1-A, U1-B, resistance R13 ~ R15；Latching circuit mechanism includes comparator
U1-C, triode Q4, Q5, resistance R7 ~ R12；Triode Q4, Q5 hinder triode using positive-negative-positive band；Comparator U1-A, U1-B,
The model of U1-C is LM339, it should be apparent that, the device model in foregoing description is only to be related to the implementation of the present invention
Example rather than limitation of the present invention hinder triode as triode Q4, Q5 are nonessential for positive-negative-positive band, comparator model nor certain
For LM339, as long as can realize that the device present invention of above-mentioned function can cover.
The collector of triode Q1, which connect with the base stage of triode Q2 and is connected with resistance R1, R4, is followed by power supply VCC, and three
The base stage of pole pipe Q1 and the emitter connection of triode Q2 are followed by between resistance R2, R3, the collector and resistance of triode Q2
R2 connections are followed by power supply VCC, and the emitter of triode Q1 is connect with one end of the collector of triode Q3, charging capacitor C1, and three
The emitter of pole pipe Q3 is grounded after being connected with the other end of charging capacitor C1, resistance R3, and the base stage of triode Q3 is separately connected
One end of resistance R5, R6, the other end connection power supply VCC of resistance R6.
The negative input end of comparator U1-B connects after being connect with the positive input terminal of comparator U1-A with one end of charging capacitor C1
It connects, resistance R15 is connected between the positive input terminal and the negative input end of comparator U1-A of comparator U1-B, and comparator U1-B is just
Input terminal connection resistance R14 is followed by power supply VCC, is grounded after the negative input end connection resistance R13 of comparator U1-A.
Comparator U1-B, the output end of comparator U1-C, the other end of resistance R5, triode Q5 base stage be connected,
The output end of comparator U1-A, the base stage of triode Q4 are connected, one end of the collector and resistance R8, R12 of triode Q4, Q5
It is connected and is followed by power supply VCC, the other end of resistance R8 is connected with one end of resistance R9 is followed by the negative input of comparator U1-C
End, and the negative input end of comparator U1-C is grounded after resistance R10, after the other end of resistance R12 is connected with one end of resistance R11
It is connected to the positive input terminal of comparator U1-C, and the positive input terminal of comparator U1-C is grounded after resistance R7.
The operation principle of the present invention is in constant-current source circuit mechanism, when the amplification factor of triode Q1 is sufficiently large, to give
The electric current Ic of charging capacitor C1 chargings is equal to the electric current flowed through between triode Q1 emitter and collectors, and Ic=V can be obtainedQ1-bc/
(R1+R4), the charge formula of general charging capacitor is V=Ic*t/C, wherein V indicates the voltage at the both ends charging capacitor C1, is
Upper amplitude voltage, t are the time, and C is the capacitance of charging capacitor C1, then as one timing of charging capacitor C1 capacitances, charging capacitor C1 two
The voltage at end rises linearly over time, is mainly realized by the charge and discharge of charging capacitor C1 due to the generation of sawtooth wave,
It is charged by controlling constant current to charging capacitor C1, that is, has obtained the curve risen linearly over time, is then controlled
Comparator U1-A, U1-B processed come the amplitude that threshold values set by comparison and sawtooth wave rise, charging capacitor C1 both end voltage output signals
It is denoted as SW, the upper amplitude of the positive input terminal setting sawtooth wave of comparator U1-B, the negative input end of comparator U1-A sets sawtooth wave
Lower amplitude, upper amplitude, lower amplitude are obtained by electric resistance partial pressure mode, i.e., are adjusted by regulation resistance R13, R14, R15
Amplitude, lower amplitude on section；It, can then when the threshold values of preset value of the charging capacitor C1 both end voltages more than comparator U1-A, U1-B
Charging capacitor C1 electric discharges are quickly given to realize by triode Q3, falling waveform is obtained, obtains zig-zag repeatedly；Constant current
Continuous current in source circuit mechanism is determined by the collector junction pressure drop and resistance R1, R4 resistance value of triode Q2, as charging capacitor C1
In the case that capacitance is certain, resistance R1, R4 resistance value size can be changed, to change charging current, to realize change sawtooth
The frequency of wave；Either, due to frequency f=1/t, i.e. f=Ic/VC, then in one timing of resistance R1, R4 resistance value, change charging capacitor
C1 capacitance sizes；Also or resistance R1, R4 resistance value and charging capacitor C1 capacitances adjust simultaneously, are attained by the mesh for adjusting frequency
's；And it can be realized by adjusting the threshold voltage of comparator U1-A, U1-B and change sawtooth wave amplitude.
Specifically, it in original state, i.e. when charging capacitor C1 both end voltages output signal SW is 0, is denoted as to charging in figure
The discharge signal SET of capacitance C1 is high level, restores to be low level to the charging signals RE of charging capacitor C1, and pass through self-locking electricity
Road mechanism locking signal state；
When the increase of SW signal values, when value is between the negative input end and the positive input terminal of comparator U1-B of comparator U1-A, letter
Number SET and signal RE is high level, and keeps signal condition；
When SW signal values continue growing, until when SW signal values are more than the positive input terminal voltage of comparator U1-B, signal SET is exported
For low level, signal RE outputs are high level, when signal SET becomes low level, the triode of the both ends charging capacitor C1 parallel connection
Q3 is connected, and voltage declines immediately on charging capacitor C1, i.e., signal SW level declines；When SW signals are negative defeated less than comparator U1-A
When entering terminal voltage, signal RE becomes low level, and triode Q4 is connected at this time, and the positive input terminal voltage of comparator U1-C, which is more than, to be compared
The negative input end voltage of device U1-C, signal SET become high level again, and charging capacitor C1 electric discharges terminate, later recharge mistake
Journey, to obtain sawtooth signal circuit.
Claims (2)
1. a kind of signal generating circuit structure comprising power supply, it is characterised in that：It further includes the perseverance by the power supply power supply
Current source circuit mechanism, to change the frequency of sawtooth wave；
Amplitude com parison circuit mechanism, to change the amplitude of sawtooth wave；
Latching circuit mechanism, to locking signal state；
The constant-current source circuit mechanism includes PNP type triode Q1 ~ Q3, resistance R1 ~ R6, charging capacitor C1；
The amplitude com parison circuit mechanism includes comparator U1-A, U1-B, resistance R13 ~ R15；
The latching circuit mechanism includes comparator U1-C, triode Q4, Q5, resistance R7 ~ R12；
The collector of the triode Q1, which connect with the base stage of the triode Q2 and is connected with described resistance R1, R4, is followed by institute
Power supply is stated, the emitter connection of the base stage of the triode Q1 and the triode Q2 are followed by between described resistance R2, R3, institute
The collector for stating triode Q2 connect with the resistance R2 and is followed by the power supply, the emitter of the triode Q1 and three pole
One end connection of the collector, charging capacitor C1 of pipe Q3, the emitter of the triode Q3 are another with the charging capacitor C1's
End, the resistance R3 are grounded after being connected, and the base stage of the triode Q3 is separately connected one end of described resistance R5, R6, described
The other end of resistance R6 connects the power supply；
The negative input end of the comparator U1-B connect with the positive input terminal of the comparator U1-A after with the charging capacitor C1
One end connection, connect the resistance between the positive input terminal of the comparator U1-B and the negative input end of the comparator U1-A
R15, and the positive input terminal of the comparator U1-B connects the resistance R14 and is followed by the power supply, the comparator U1-A's is negative
Input terminal is grounded after connecting the resistance R13；
The comparator U1-B, the output end of comparator U1-C, the other end of resistance R5, triode Q5 base stage be connected,
The output end of the comparator U1-A, the base stage of triode Q4 are connected, collector and the resistance of described triode Q4, Q5
One end of R8, R12, which are connected, is followed by the power supply, and the other end of the resistance R8 is connected with one end of the resistance R9 to be followed by
In the negative input end of the comparator U1-C, and the negative input end of the comparator U1-C is grounded after the resistance R10, described
The other end of resistance R12 is connected with one end of the resistance R11 to be followed by the positive input terminal of the comparator U1-C, and the ratio
Positive input terminal compared with device U1-C is grounded after the resistance R7.
2. a kind of signal generating circuit structure according to claim 1, it is characterised in that：Described triode Q4, Q5 are used
Positive-negative-positive band hinders triode, and the model of described comparator U1-A, U1-B, U1-C are LM339.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810842171.7A CN108777571B (en) | 2018-07-27 | 2018-07-27 | Signal generation circuit structure |
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| CN201810842171.7A CN108777571B (en) | 2018-07-27 | 2018-07-27 | Signal generation circuit structure |
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| CN108777571A true CN108777571A (en) | 2018-11-09 |
| CN108777571B CN108777571B (en) | 2024-04-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111464155A (en) * | 2020-03-23 | 2020-07-28 | 科华恒盛股份有限公司 | Sawtooth wave generating circuit |
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| Publication number | Publication date |
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| CN108777571B (en) | 2024-04-02 |
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