CN107565954A - Passive shaping circuit - Google Patents
Passive shaping circuit Download PDFInfo
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- CN107565954A CN107565954A CN201610509754.9A CN201610509754A CN107565954A CN 107565954 A CN107565954 A CN 107565954A CN 201610509754 A CN201610509754 A CN 201610509754A CN 107565954 A CN107565954 A CN 107565954A
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Abstract
The invention discloses a kind of passive shaping circuit, the circuit includes：First triode, second triode, first resistor, second resistance, 3rd resistor, 4th resistance and the 5th resistance, the emitter stage of first triode is connected with negative input, the colelctor electrode of first triode is connected through first resistor with the base stage of the second triode, the base stage of first triode is connected through second resistance with the colelctor electrode of the second triode, the base stage of first triode is connected through 3rd resistor with negative input, the emitter stage connection electrode input end of second triode, the base stage of second triode connects negative input by the 4th resistance, the base stage of second triode connects electrode input end by the 5th resistance, the colelctor electrode connection cathode output end of second triode, negative input connects cathode output end.The passive shaping circuit can effectively filter out the differential mode noise carried in signal, and strong antijamming capability, stability is good, be powered without external insulating power supply, simple in construction.
Description
Technical field
The present invention relates to electronic circuit field, in particular it relates to a kind of passive shaping circuit.
Background technology
In industrial settings, it is general to eliminate interference of the common-mode noise to signal using light-coupled isolation, but light-coupled isolation
Interference of the differential mode noise to signal can not be completely eliminated.
At present, eliminate the differential mode noise carried in echo signal and mainly use active shaping circuit.Though active shaping circuit
Differential mode noise can be so effectively filtered out, but such a method needs to be additionally provided insulating power supply all the way and powered for shaping circuit, increases
Add the complexity of circuit, and improve the cost of shaping circuit.Furthermore it is also possible to (such as filtered using filtering mode by RC
Wave circuit) differential mode noise is eliminated, this method is in the case of noise bandwidth is uncertain, it is easy to useful signal is filtered out, or
Part interference can not be played a role, in the case where noise is higher, it is also possible to the problem of filter effect is poor be present.
The content of the invention
It is an object of the invention to provide a kind of passive shaping circuit for simply and effectively filtering out differential mode noise.
To achieve these goals, the present invention provides a kind of passive shaping circuit, and the passive shaping circuit includes：First
Triode, the second triode, first resistor, second resistance, 3rd resistor, the 4th resistance and the 5th resistance.
Wherein, the emitter stage of first triode is connected with the negative input of the passive shaping circuit, and described
The colelctor electrode of one triode is connected via the first resistor with the base stage of second triode, the base of first triode
Pole is connected via the second resistance with the colelctor electrode of second triode, and the base stage of first triode is via described
Three resistance are connected with the negative input, and the base stage of second triode is inputted by the 4th resistance and the negative pole
End connection, the base stage of second triode are connected by the 5th resistance with the electrode input end, the two or three pole
The emitter stage of pipe is connected with the electrode input end of the passive shaping circuit, and the colelctor electrode of second triode connects the nothing
The cathode output end of source shaping circuit, the negative input connect the cathode output end of the passive shaping circuit.
Wherein, first triode, the second triode, first resistor, second resistance, 3rd resistor, the 4th resistance with
And the 5th resistance be used to determine rising edge conduction threshold and trailing edge conduction threshold so that the arteries and veins of the input passive shaping circuit
Rush signal to change from low level to high level, and when voltage is less than the rising edge conduction threshold, and from high level to
Low transition, and be turned off when voltage is less than the trailing edge conduction threshold.
Alternatively, the passive shaping circuit also includes：First diode and the second diode, wherein, the described 1st
The colelctor electrode of pole pipe is connected with the negative electrode of first diode, and anode and the negative input of first diode connect
Connect, the emitter stage of second triode is connected with the negative electrode of second diode, the anode of second diode and institute
State the colelctor electrode connection of the second triode.
Alternatively, the passive shaping circuit also includes：3rd triode, the 6th resistance and the 7th resistance, wherein, it is described
The emitter stage of 3rd triode is connected with the colelctor electrode of second triode, and the base stage of the 3rd triode is via described
Six resistance are connected with the electrode input end, and the base stage of the 3rd triode inputs via the 7th resistance and the negative pole
End connection, the colelctor electrode of the 3rd triode connect the cathode output end.
Alternatively, the passive shaping circuit also includes：3rd diode and the 4th diode, wherein, the described 3rd 3
The base stage of pole pipe is connected with the anode of the 3rd diode, the negative electrode of the 3rd diode and the collection of second triode
Electrode is connected, and the colelctor electrode of the 3rd triode is connected with the anode of the 4th diode, the moon of the 4th diode
Pole is connected with the colelctor electrode of second triode.
Alternatively, the passive shaping circuit also includes：First diode, the second diode, the 3rd triode, the 6th electricity
Resistance, the 7th resistance, the 3rd diode and the 4th diode.
Wherein, the colelctor electrode of first triode is connected with the negative electrode of first diode, first diode
Anode be connected with the negative input, the emitter stage of second triode is connected with the negative electrode of second diode,
The anode of second diode is connected with the colelctor electrode of second triode, the emitter stage of the 3rd triode with it is described
The colelctor electrode connection of second triode, the colelctor electrode of the 3rd triode connect the cathode output end, the three or three pole
The base stage of pipe is connected with the anode of the 3rd diode, the negative electrode of the 3rd diode and the current collection of second triode
Pole is connected, and the colelctor electrode of the 3rd triode is connected with the anode of the 4th diode, the negative electrode of the 4th diode
It is connected with the colelctor electrode of second triode, the base stage of the 3rd triode is defeated via the 6th resistance and the positive pole
Enter end connection, the base stage of the 3rd triode is connected via the 7th resistance with the negative input.
The rising edge conduction threshold and the trailing edge conduction threshold are determined according to below equation：
VT1＜ VTL；
Wherein, VTHFor the rising edge conduction threshold, VbeQ2For the conduction voltage drop of second triode, VTLUnder described
Drop along conduction threshold, VceQ1For the magnitude of voltage between first transistor collector and emitter stage, VT1For the input signal
Magnitude of voltage in from high level to second transistor collector during low transition, VbeQ1For first triode
Conduction voltage drop, R1For the resistance value of the first resistor, R2For the resistance value of the second resistance, R3For the 3rd resistor
Resistance value, R4For the resistance value of the 4th resistance, R5For the resistance value of the 5th resistance, R6For the electricity of the 6th resistance
Resistance, R7For the resistance value of the 7th resistance, VT3For the base voltage value of the 3rd triode, VTAFor the pulse signal
Magnitude of voltage, VjFor magnitude of voltage of the 3rd triode operation at amplification region, β1For the amplification system of first triode
Number, β2For the amplification coefficient of second triode, Vd3For the magnitude of voltage of the 3rd diode, Vbe2For the two or three pole
Magnitude of voltage between the base stage and emitter stage of pipe, VbeQ3For the conduction voltage drop of the 3rd triode.
Alternatively, the passive shaping circuit also includes load resistance, and the load resistance is connected to the positive pole output
Between end and the cathode output end.
Pass through above-mentioned technical proposal, by changing the device parameters in passive shaping circuit rising edge can be set to turn on
Threshold value and trailing edge conduction threshold so that the pulse signal for flowing through the passive shaping circuit is changed from low level to high level,
And voltage is when being less than rising edge conduction threshold, and from high level to low transition, and voltage is less than trailing edge conducting threshold
It is turned off during value.In such manner, it is possible to the differential mode noise carried in pulse signal is effective filtered out, and strong antijamming capability, stability
It is good, meanwhile, the passive shaping circuit is simple in construction, and electric energy is provided without external insulating power supply.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the circuit diagram of the passive shaping circuit provided according to an embodiment of the present invention；
Fig. 2 is the circuit diagram of the passive shaping circuit provided according to another embodiment of the present invention；
Fig. 3 is the circuit diagram of the passive shaping circuit provided according to another embodiment of the invention；
Fig. 4 is the circuit diagram of the passive shaping circuit provided according to another embodiment of the invention；
Fig. 5 is the circuit diagram of the passive shaping circuit provided according to another embodiment of the invention；
Fig. 6 is the circuit diagram of the passive shaping circuit provided according to another embodiment of the invention；And
Fig. 7 a and 7b are the time domains of the input/output of the passive shaping circuit provided under one embodiment of the present invention
Oscillogram.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Fig. 1 is the circuit diagram of the passive shaping circuit provided according to an embodiment of the present invention.As shown in figure 1, the nothing
Source shaping circuit can include the first triode Q1, the second triode Q2, first resistor R1, second resistance R2,3rd resistor R3,
4th resistance R4 and the 5th resistance R5.
Wherein, the first triode Q1 emitter stage is connected with the negative input IN- of passive shaping circuit, the first triode
Q1 colelctor electrode is connected via first resistor R1 with the second triode Q2 base stage, and the first triode Q1 base stage is via the second electricity
Resistance R2 is connected with the second triode Q2 colelctor electrode, and the first triode Q1 base stage is via 3rd resistor R3 and negative input
IN- connections, the second triode Q2 base stage are connected by the 4th resistance R4 with negative input IN-, the second triode Q2 base
Pole is connected by the 5th resistance R5 with electrode input end IN+, the second triode Q2 emitter stage and the positive pole of passive shaping circuit
Input IN+ connections, the cathode output end OUT+ of the second triode Q2 colelctor electrode connected with passive shaping circuit, negative input
The cathode output end OUT- of IN- connected with passive shaping circuits.
Wherein, the first triode Q1, the second triode Q2, first resistor R1, second resistance R2,3rd resistor R3, the 4th
Resistance R4 and the 5th resistance R5 is used to determine rising edge conduction threshold and trailing edge conduction threshold so that inputs passive shaping electricity
The pulse signal on road is changed from low level to high level, and when voltage is less than rising edge conduction threshold, and by high level
It is turned off to low transition, and when voltage is less than trailing edge conduction threshold.
As shown in figure 1, exemplarily, the first triode Q1 can be NPN type triode, the second triode Q2 can be
PNP type triode.When there is pulse signal inflow, during circuit start, pulse signal is turned from low level to high level
Change, second resistance R2 and 3rd resistor R3 series connection, can make to produce positive electricity between the first triode Q1 colelctor electrode and base stage
Pressure difference so that the first triode Q1 emitter junction positively biased, the first triode Q1 are operated in amplification region.Meanwhile the first triode Q1
Colelctor electrode output electric current can via first resistor R1 influence the second triode Q2 base voltage value, when pulse signal
When magnitude of voltage continues to rise, the first triode Q1 can enter saturation region operation, and the electric current of its colelctor electrode output is no longer believed with pulse
The change of number magnitude of voltage and change, now, the electric current of the first triode Q1 colelctor electrode output is via first resistor R1 by second
Triode Q2 base voltage value clamper is in a fixed value, when the magnitude of voltage of pulse signal is not more than the fixed value, then the 2nd 3
Pole pipe Q2 works into cut-off region, is breaking, passive shaping circuit no signal provided by the invention between its base stage and colelctor electrode
Output, i.e. magnitude of voltage are close to 0V；The magnitude of voltage of pulse signal continues to rise, when its electricity of base stage more than the second triode Q2
During pressure value, the second triode Q2 is set also to enter saturation region operation, now, passive shaping circuit output pulse letter provided by the invention
Number, the fixed value is then the rising edge conduction threshold of pulse signal.
When pulse signal starts from high level to low transition, the first triode Q1 also operates at saturation region, and it collects
The electric current of electrode is not influenceed by pulse signal change, and the first triode Q1 influences the second triode Q2's via first resistor R1
Base voltage value, when the magnitude of voltage of pulse signal continues to decline, the first triode Q1 will be unable to continue in saturation region operation, by the
The base voltage value for the second triode Q2 that one resistance R1 influences also no longer is fixed value, the 4th resistance R4 and the 5th resistance R5 strings
Connection so that the first triode Q1 can produce electricity not in saturation region operation between the second triode Q2 emitter stage and base stage
Pressure difference, when the voltage difference is more than the second triode Q2 conduction voltage drop, the second triode Q2 conductings, the second triode Q2 transmitting
When pole tension value is less than its base voltage value, the second triode Q2 can reliably be operated in cut-off region, it should be understood that this
Invention is not intended to limit the second triode Q2 concrete model, wherein, the second triode Q2 conduction voltage drop may, for example, be 0.7V,
So that the second triode Q2 turns on threshold by the trailing edge that the critical voltage value of saturation region into cut-off region is pulse input signal
Value.Pulse signal to low transition and its magnitude of voltage from high level when being more than the trailing edge conduction threshold, the second triode
Q2 is in saturation state, passive shaping circuit conducting, output pulse signal；When the magnitude of voltage of pulse signal is led less than the trailing edge
During logical threshold value, the second triode Q2 works into cut-off region, and no signal output, i.e. magnitude of voltage are close to 0V.
Pass through above-mentioned technical proposal, by changing the device parameters in passive shaping circuit rising edge can be set to turn on
Threshold value and trailing edge conduction threshold so that the pulse signal for flowing through the passive shaping circuit is changed from low level to high level,
And voltage is when being less than rising edge conduction threshold, and from high level to low transition, and voltage is less than trailing edge conducting threshold
It is turned off during value.In such manner, it is possible to the differential mode noise carried in pulse signal is effective filtered out, and strong antijamming capability, stability
It is good, meanwhile, the passive shaping circuit is simple in construction, and electric energy is provided without external insulating power supply.
Fig. 2 is the circuit diagram of the passive shaping circuit provided according to another embodiment of the present invention.As shown in Fig. 2
On the basis of Fig. 1, the passive shaping circuit can also include the first diode D1 and the second diode D2.
Wherein, the first triode Q1 colelctor electrode is connected with the first diode D1 negative electrode, the first diode D1 anode
It is connected with negative input IN-, the second triode Q2 emitter stage is connected with the second diode D2 negative electrode, the second diode D2
Anode be connected with the second triode Q2 colelctor electrode.
Because circuit in the moment for starting or turning off may produce reverse big voltage times over input voltage, therefore it is
Reversely big voltage breakdown triode is avoided, can connect the one or two pole between the first triode Q1 emitter stage and colelctor electrode
Pipe D1, and the second diode D2 is connected between the second triode Q2 emitter stage and colelctor electrode, provided back for reverse current
Road, to protect triode.In addition, passive shaping circuit provided by the invention is not to the first diode D1, the second diode D2
Concrete model is limited, and the diode with one-way conduction function is belonged within protection scope of the present invention.
Fig. 3 is the circuit diagram of the passive shaping circuit provided according to another embodiment of the invention.As shown in figure 3,
On the basis of Fig. 1, the passive shaping circuit can also include：3rd triode Q3, the 6th resistance R6 and the 7th resistance R7.Its
In, the 3rd triode Q3 emitter stage is connected with the second triode Q2 colelctor electrode, and the 3rd triode Q3 base stage is via the 6th
Resistance R6 is connected with electrode input end IN+, and the 3rd triode Q3 base stage connects via the 7th resistance R7 and negative input IN-
Connect, the 3rd triode Q3 colelctor electrode connection cathode output end OUT+.
When low and high level conversion is carried out near rising edge conduction threshold due to pulse signal, wherein the noise carried may
The first triode Q1 and the second triode Q2 can be made to enter linear amplification region, so as to produce the switch hair unfavorable to shaping effect
Thorn.6th resistance R6 and the 7th resistance R7 series connection partial pressures, by the resistance value and the 7th resistance R7 that set the 6th resistance R6
Resistance value can set the 3rd triode Q3 base voltage value, so that in the reshaping signal of the second triode Q2 colelctor electrodes output
Magnitude of voltage be more than the 3rd triode Q3 base voltage value, the 3rd triode Q3 just turns on；Second triode Q2 colelctor electrodes are defeated
When the magnitude of voltage of the reshaping signal gone out is less than the 3rd triode Q3 base voltage value, the 3rd triode Q3 can reliably end.
In the passive shaping circuit provided in the embodiment, the burr in output signal in previous embodiment can be filtered out, therefore change
It has been apt to shaping effect.
Fig. 4 is the circuit diagram of the passive shaping circuit provided according to another embodiment of the invention.As shown in figure 4,
On the basis of Fig. 3, the passive shaping circuit can also include the 3rd diode D3 and the 4th diode D4.Wherein, the three or three pole
Pipe Q3 base stage is connected with the 3rd diode D3 anode, and the 3rd diode D3 negative electrode and the second triode Q2 colelctor electrode connect
Connect, the 3rd triode Q3 colelctor electrode is connected with the 4th diode D4 anode, the 4th diode D4 negative electrode and the two or three pole
Pipe Q2 colelctor electrode connection.
Thus, set the 3rd diode D3 that the second triode Q2 and the 3rd triode Q3 can be made not lead under normal circumstances
It is logical, avoid interfering with each other, while in order to protect the 3rd triode Q3, set the 4th diode D4 to provide for reverse current and turn on back
Road.Similarly, the present invention is not intended to limit the 3rd diode D3 and the 4th diode D4 concrete model, as long as list can be realized
Belonged to the diode of conducting within protection scope of the present invention.
Fig. 5 is the circuit diagram of the passive shaping circuit provided according to another embodiment of the invention.As shown in figure 5,
On the basis of Fig. 1, the passive shaping circuit can also include the first diode D1, the second diode D2, the 3rd triode Q3, the
Six resistance R6, the 7th resistance R7, the 3rd diode D3 and the 4th diode D4.
Wherein, the first triode Q1 colelctor electrode is connected with the first diode D1 negative electrode, the first diode D1 anode
It is connected with negative input IN-, the second triode Q2 emitter stage is connected with the second diode D2 negative electrode, the second diode D2
Anode be connected with the second triode Q2 colelctor electrode, the 3rd triode Q3 emitter stage and the second triode Q2 colelctor electrode connects
Connect, the 3rd triode Q3 colelctor electrode connection cathode output end OUT+, the 3rd triode Q3 base stage are with the 3rd diode D3's
Anode connects, and the 3rd diode D3 negative electrode is connected with the second triode Q2 colelctor electrode, the 3rd triode Q3 colelctor electrode and
4th diode D4 anode connection, the 4th diode D4 negative electrode are connected with the second triode Q2 colelctor electrode, the three or three pole
Pipe Q3 base stage is connected via the 6th resistance R6 with electrode input end IN+, and the 3rd triode Q3 base stage is via the 7th resistance R7
It is connected with negative input IN-.
Rising edge conduction threshold and trailing edge conduction threshold are determined according to below equation：
VT1＜ VTL；
Wherein, VTHFor rising edge conduction threshold, VbeQ2For the second triode Q2 conduction voltage drop, VTLThreshold is turned on for trailing edge
Value, VceQ1For the magnitude of voltage between the first triode Q1 colelctor electrodes and emitter stage, VT1For input signal in high level to low level
The magnitude of voltage of second triode Q2 colelctor electrodes, V in transfer processbeQ1For the first triode Q1 conduction voltage drop, R1For first resistor
R1 resistance value, R2For second resistance R2 resistance value, R3For 3rd resistor R3 resistance value, R4For the 4th resistance R4 resistance
Value, R5For the 5th resistance R5 resistance value, R6For the 6th resistance R6 resistance value, R7For the 7th resistance R7 resistance value, VT3For
Three triode Q3 base voltage value, VTAFor the magnitude of voltage of pulse signal, VjWhen being operated in amplification region for the 3rd triode Q3
Magnitude of voltage, β1For the first triode Q1 amplification coefficient, β2For the second triode Q2 amplification coefficient, Vd3For the 3rd diode D3
Magnitude of voltage, Vbe2The magnitude of voltage between base stage and emitter stage for the second triode Q2, VbeQ3For the 3rd triode Q3 conducting
Pressure drop.
The partial pressure as shown in figure 5, the 4th resistance R4 connects with the 5th resistance R5, the second triode Q2, which is in, enters saturation region work
During the critical condition of work, its emitter junction positively biased, the voltage at the 5th resistance R5 both ends is the second triode Q2 conduction voltage drop, arteries and veins
Rushing the magnitude of voltage of signal now can be expressed as：The quilt when the magnitude of voltage of pulse signal is more than this magnitude of voltage
Conducting, therefore the rising edge conduction threshold V of pulse signalTHIt can be expressed as：Pulse signal by
During low level is changed to high level, its magnitude of voltage is switched on when being more than the rising edge conduction threshold, is otherwise turned off.
When pulse signal is started from high level to low transition, the first triode Q1 is changed from saturation region to cut-off region,
Under its critical condition, the electric current very little between the first triode Q1 emitter stage and colelctor electrode, the second triode Q2 base stages
Magnitude of voltage may be considered first resistor R1 and corresponding magnitude of voltage of being connected again with the 5th resistance R5 after the 4th resistance R4 parallel connections,
Utilize the second triode Q2 and first resistor R1, the 4th resistance R4 and the 5th resistance R5 annexation, the second triode Q2
The magnitude of voltage V of base stageeQ2It can be expressed as：Now the second triode Q2 emitter stages and base stage
Between magnitude of voltage Vbe2Can be by the magnitude of voltage V between the first triode Q1 emitter stage and colelctor electrodeceQ1And the company of circuit
The relation of connecing is expressed as：To make the second triode Q2 be operated in saturation region, the magnitude of voltage of pulse signal needs
The condition to be met is：More than the magnitude of voltage V of the second triode Q2 base stageseQ2Between the second triode Q2 emitter stages and base stage
Magnitude of voltage Vbe2Sum, therefore the trailing edge conduction threshold V of pulse signalTLIt can be expressed as：
In addition, pulse signal continues to decline, worked to avoid the second triode Q2 from entering amplification region, it is necessary to which its collector junction is anti-
Partially, it is poor that backward voltage is produced between base stage and colelctor electrode, according to circuit connecting relation, the second triode Q2 collector voltage value
VT1It can be expressed as：The second triode Q2 is avoided into its collector voltage of amplification region need of work
Value VT1Less than VTL。
As shown in figure 5, the 6th resistance R6 connects with the 7th resistance R7, base voltage value, root are provided for the 3rd triode Q3
According to the triode Q3 of annexation the 3rd of circuit base voltage value VT3It can be expressed as：Exemplarily,
3rd triode Q3 is the triode of positive-negative-positive number, and the 3rd triode Q3 is operated in saturation region, then the 3rd triode Q3 emitter junction
Positively biased, the magnitude of voltage of the reshaping signal of the second triode Q3 colelctor electrodes output should be greater than the 3rd triode Q3 base voltage values.Cause
This 3rd triode Q3 base voltage value VT3It is the shaping threshold value that passive shaping circuit filters out switch burr.Wherein, VTAFor
The magnitude of voltage of pulse signal.
In one embodiment, the 6th resistance R6 resistance value can be set equal with the 7th resistance R7 resistance value,
Then the 3rd triode Q3 base voltage value VT3Can beIf the reshaping signal of the second triode Q3 colelctor electrodes output
Magnitude of voltage is more thanThen the 3rd triode Q3 is operated in saturation region；If the reshaping signal of the second triode Q2 colelctor electrodes output
Magnitude of voltage be less thanThen the 3rd triode Q3 is operated in cut-off region.
In addition, when pulse signal is changed from low level to high level, the 3rd triode Q3 is avoided to be worked into amplification region,
The magnitude of voltage of the reshaping signal of the second triode Q2 colelctor electrodes output is needed to be more than the electricity that the 3rd triode Q3 is operated in amplification region
Pressure value Vj.The magnitude of voltage of the reshaping signal of second triode Q2 colelctor electrodes output is the magnitude of voltage of the 3rd triode Q3 emitter stages
Ve3, the 3rd triode Q3 emitter voltage value Ve3Can be by the 3rd triode Q3 base voltage value Vb3With its conduction voltage drop
VbeQ3And represent.Therefore the magnitude of voltage V of the 3rd triode Q3 emitter stagese3It can be expressed as：
Avoid the 3rd triode Q3 from entering amplification region when pulse signal is changed from low level to high level, then should meet：
According to circuit connecting relation, the first triode Q1 conduction voltage drop VbeQ1It can be expressed as：Voltage between second triode Q2 emitter stages and colelctor electrode
Value VecQ2It can be expressed as：VecQ2=VTA-Vj, the current value I between the first triode Q1 base stages and emitter stagebeQ1It can represent
For：The current value I of second triode Q2 base stagesbQ2It can be expressed as：According to the characteristic of triode, the electric current between the first triode Q1 colelctor electrodes and emitter stage
Value IceQ1It can be expressed as：IceQ1=β1IbeQ1, the current value I between the second triode Q2 emitter stages and colelctor electrodeecQ2Can be with table
It is shown as：IecQ2=β2IbQ2.Wherein, IceQ1For the current value between the first triode Q1 colelctor electrodes and emitter stage, IecQ2For second
Current value between triode Q2 emitter stages and colelctor electrode, Vbe2For the magnitude of voltage between the second triode Q2 base stages and emitter stage.
By the annexation between circuit, the 3rd triode Q3 is operated in the magnitude of voltage V of amplification regionjIt can be expressed as：
Thus, it is possible to according to the demand of different pulse signals, by selecting the model of triode and the electricity of each resistance
Resistance flexibly sets the rising edge conduction threshold of pulse input signal, trailing edge conduction threshold and filters out the whole of switch burr
Shape threshold value, so that passive shaping circuit provided by the invention goes for different pulse signals.
Fig. 6 is the circuit diagram of the passive shaping circuit provided according to another embodiment of the invention.As shown in fig. 6,
On the basis of Fig. 5, the passive shaping circuit can also include load resistance R8, and load resistance R8 is connected to cathode output end OUT+
Between cathode output end OUT-.Increase load resistance R8 enables to the output signal voltage value of passive shaping circuit more steady
It is fixed.
Fig. 7 a and 7b are the time domains of the input/output of the passive shaping circuit provided under one embodiment of the present invention
Oscillogram.Wherein, the grey parts of the sine wave shown in Fig. 7 a are that pulse signal is not output after passive shaping circuit
Part.Waveform in Fig. 7 b is the oscillogram that pulse signal exports after passive shaping circuit.Transverse axis represents time t, unit
It is millisecond (ms), the longitudinal axis represents the magnitude of voltage of pulse signal, and unit is volt (V).It is big that input signal employs sine-wave superimposed
The mode of noise, whole sinusoidal waveform represent the pulse signal of the passive shaping circuit of input, wherein, black portions represent passive whole
The output signal of shape circuit.The passive shaping circuit is changed in pulse signal from low level to high level and its magnitude of voltage is more than upper
Turned on when rising along conduction threshold；It is less than trailing edge conduction threshold from high level to low transition and its magnitude of voltage in pulse signal
When, not output signal.Thus, for magnitude of voltage close to low level and when be not negative voltage, the voltage of its output signal is stable
, the influence of big noise is not affected by, the differential mode noise carried in pulse signal can be effectively filtered out.For optocoupler input,
Only to more sensitive close to the voltage change at low level, will not be influenceed by noise at high level.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, still, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the present invention, a variety of letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (6)
1. a kind of passive shaping circuit, it is characterised in that the passive shaping circuit includes：First triode Q1, the two or three pole
Pipe Q2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 and the 5th resistance R5,
Wherein, the emitter stage of the first triode Q1 is connected with the negative input of the passive shaping circuit, and described first
Triode Q1 colelctor electrode is connected via the first resistor R1 with the base stage of the second triode Q2, first triode
Q1 base stage is connected via the second resistance R2 with the colelctor electrode of the second triode Q2, the base of the first triode Q1
Pole is connected via the 3rd resistor R3 with the negative input, and the base stage of the second triode Q2 passes through the described 4th electricity
Resistance R4 is connected with the negative input, and the base stage of the second triode Q2 is defeated by the 5th resistance R5 and the positive pole
Entering end connection, the emitter stage of the second triode Q2 is connected with the electrode input end of the passive shaping circuit, and described second
Triode Q2 colelctor electrode connects the cathode output end of the passive shaping circuit, and the negative input connection is described passive whole
The cathode output end of shape circuit,
Wherein, the first triode Q1, the second triode Q2, first resistor R1, second resistance R2,3rd resistor R3, the 4th
Resistance R4 and the 5th resistance R5 is used to determine rising edge conduction threshold and trailing edge conduction threshold so that input is described passive whole
The pulse signal of shape circuit is changed from low level to high level, and when voltage is less than the rising edge conduction threshold, Yi Ji
From high level to low transition, and it is turned off when voltage is less than the trailing edge conduction threshold.
2. passive shaping circuit according to claim 1, it is characterised in that the passive shaping circuit also includes：First
Diode D1 and the second diode D2,
Wherein, the colelctor electrode of the first triode Q1 is connected with the negative electrode of the first diode D1, first diode
D1 anode is connected with the negative input, the negative electrode of the emitter stage of the second triode Q2 and the second diode D2
Connection, the anode of the second diode D2 are connected with the colelctor electrode of the second triode Q2.
3. passive shaping circuit according to claim 1, it is characterised in that the passive shaping circuit also includes：3rd
Triode Q3, the 6th resistance R6 and the 7th resistance R7, wherein, emitter stage and second triode of the 3rd triode Q3
Q2 colelctor electrode connection, the base stage of the 3rd triode Q3 are connected via the 6th resistance R6 with the electrode input end,
The base stage of the 3rd triode Q3 is connected via the 7th resistance R7 with the negative input, the 3rd triode Q3
Colelctor electrode connect the cathode output end.
4. passive shaping circuit according to claim 3, it is characterised in that the passive shaping circuit also includes：3rd
Diode D3 and the 4th diode D4, wherein, the base stage of the 3rd triode Q3 connects with the anode of the 3rd diode D3
Connect, the negative electrode of the 3rd diode D3 is connected with the colelctor electrode of the second triode Q2, the collection of the 3rd triode Q3
Electrode is connected with the anode of the 4th diode D4, the collection of the negative electrode of the 4th diode D4 and the second triode Q2
Electrode connects.
5. the passive shaping circuit according to any claim in claim 1-4, it is characterised in that the passive shaping
Circuit also includes：First diode D1, the second diode D2, the 3rd triode Q3, the 6th resistance R6, the 7th resistance R7, the 3rd
Diode D3 and the 4th diode D4,
Wherein, the colelctor electrode of the first triode Q1 is connected with the negative electrode of the first diode D1, first diode
D1 anode is connected with the negative input, the negative electrode of the emitter stage of the second triode Q2 and the second diode D2
Connection, the anode of the second diode D2 are connected with the colelctor electrode of the second triode Q2, the 3rd triode Q3's
Emitter stage is connected with the colelctor electrode of the second triode Q2, and the colelctor electrode of the 3rd triode Q3 connects the positive pole output
End, the base stage of the 3rd triode Q3 are connected with the anode of the 3rd diode D3, the negative electrode of the 3rd diode D3
It is connected with the colelctor electrode of the second triode Q2, the colelctor electrode of the 3rd triode Q3 and the sun of the 4th diode D4
Pole is connected, and the negative electrode of the 4th diode D4 is connected with the colelctor electrode of the second triode Q2, the 3rd triode Q3
Base stage be connected via the 6th resistance R6 with the electrode input end, the base stage of the 3rd triode Q3 is via described
Seven resistance R7 are connected with the negative input,
The rising edge conduction threshold and the trailing edge conduction threshold are determined according to below equation：
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Wherein, VTHFor the rising edge conduction threshold, VbeQ2For the conduction voltage drop of the second triode Q2, VTLFor the decline
Along conduction threshold, VceQ1For the magnitude of voltage between the first triode Q1 colelctor electrodes and emitter stage, VT1For the input signal
Magnitude of voltage in from high level to the second triode Q2 colelctor electrodes during low transition, VbeQ1For first triode
Q1 conduction voltage drop, R1For the resistance value of the first resistor R1, R2For the resistance value of the second resistance R2, R3For described
Three resistance R3 resistance value, R4For the resistance value of the 4th resistance R4, R5For the resistance value of the 5th resistance R5, R6For institute
State the 6th resistance R6 resistance value, R7For the resistance value of the 7th resistance R7, VT3For the base stage electricity of the 3rd triode Q3
Pressure value, VTAFor the magnitude of voltage of the pulse signal, VjMagnitude of voltage during amplification region, β are operated in for the 3rd triode Q31For
The amplification coefficient of the first triode Q1, β2For the amplification coefficient of the second triode Q2, Vd3For the 3rd diode
D3 magnitude of voltage, Vbe2The magnitude of voltage between base stage and emitter stage for the second triode Q2, VbeQ3For the three or three pole
Pipe Q3 conduction voltage drop.
6. passive shaping circuit according to claim 5, it is characterised in that the passive shaping circuit also includes load electricity
R8 is hindered, the load resistance R8 is connected between the cathode output end and the cathode output end.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116471723A (en) * | 2023-05-25 | 2023-07-21 | 湖北工业大学 | LED serial fault bypass circuit and method based on constant current control |
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|---|---|---|---|---|
| US4161703A (en) * | 1977-03-22 | 1979-07-17 | Licentia Patent-Verwaltungs-G.M.B.H. | Schmitt trigger square wave oscillator |
| CN201467542U (en) * | 2009-06-16 | 2010-05-12 | 深圳市垅运照明电器有限公司 | Direct current (DC) electronic ballast and half-bridge inverter LC series-resonance circuit thereof |
| CN101867214A (en) * | 2010-06-24 | 2010-10-20 | 深圳市瑞必达电源有限公司 | Charging circuit and charger |
| CN102769453A (en) * | 2012-06-30 | 2012-11-07 | 东南大学 | High-voltage side gate drive circuit capable of resisting noise interference |
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2016
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4161703A (en) * | 1977-03-22 | 1979-07-17 | Licentia Patent-Verwaltungs-G.M.B.H. | Schmitt trigger square wave oscillator |
| CN201467542U (en) * | 2009-06-16 | 2010-05-12 | 深圳市垅运照明电器有限公司 | Direct current (DC) electronic ballast and half-bridge inverter LC series-resonance circuit thereof |
| CN101867214A (en) * | 2010-06-24 | 2010-10-20 | 深圳市瑞必达电源有限公司 | Charging circuit and charger |
| CN102769453A (en) * | 2012-06-30 | 2012-11-07 | 东南大学 | High-voltage side gate drive circuit capable of resisting noise interference |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116471723A (en) * | 2023-05-25 | 2023-07-21 | 湖北工业大学 | LED serial fault bypass circuit and method based on constant current control |
| CN116471723B (en) * | 2023-05-25 | 2023-09-15 | 湖北工业大学 | LED serial fault bypass circuit and method based on constant current control |
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