CN107462765A - A kind of signal deteching circuit and device - Google Patents
A kind of signal deteching circuit and device Download PDFInfo
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- CN107462765A CN107462765A CN201710801545.6A CN201710801545A CN107462765A CN 107462765 A CN107462765 A CN 107462765A CN 201710801545 A CN201710801545 A CN 201710801545A CN 107462765 A CN107462765 A CN 107462765A
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Abstract
The present invention proposes a kind of signal deteching circuit, including compares amplifying circuit, rectification circuit and change-over circuit, compares amplifying circuit and is used for the voltage of AC signal more to be detected and refers to DC voltage, and the voltage signal of an amplification is exported according to comparative result；Rectification circuit output end of amplifying circuit compared with is connected, and the voltage signal for the amplification to comparing amplifying circuit output carries out rectification, with the positive voltage signal or negative voltage signal of the voltage signal of output amplification；Change-over circuit is connected with the output end of rectification circuit, and the positive voltage signal of amplification or the negative voltage signal of amplification for rectification circuit to be exported are converted to DC voltage.The present invention also provides a kind of signal supervisory instrument.The size that signal deteching circuit and device provided by the invention pass through the approximate DC voltage signal of detection output, judge whether normally output exchange shows voltage signal to PCBA board, further to detect PCBA board, whether mistake is burnt or burnt in program leakage, and detection process is convenient not to influence production capacity again.
Description
Technical field
The present invention relates to signal detection technique field, more particularly to a kind of signal deteching circuit and device.
Background technology
For current liquid crystal display product, it is production to ensure that liquid crystal display device can receive stable display voltage signal
The key factor of product reliability.Therefore, detection shows whether signal output function is normal, particularly detects the aobvious of PCBA board output
Show whether voltage signal meets design requirement, can effectively reduce the risk of heavy industry.
In PCBA board production process, often there is the problem of SCM program leakage is burnt with burning exception, so as to cause PCBA
The display voltage signal of plate output error, manufacturing schedule and the reliability of product are had a strong impact on, but show that voltage signal is often
Ac voltage signal, so in process of production, the exchange for PCBA board output shows voltage signal, can not use universal meter or
Voltmeter direct measurement, and go detection is both inconvenient can influence production capacity with oscillograph.
The content of the invention
In view of this, present invention aims at a kind of signal deteching circuit is provided, it is defeated that easily detection PCBA board can be used for
The exchange gone out shows voltage signal.
The present invention proposes a kind of signal deteching circuit, including compares amplifying circuit, rectification circuit and change-over circuit.The ratio
It is used for the voltage of AC signal more to be detected compared with amplifying circuit and refers to DC voltage, and exports one according to comparative result and put
Big voltage signal；Rectification circuit output end of amplifying circuit compared with described is connected, for relatively amplifying electricity to described
The voltage signal of the amplification of road output carries out rectification, is believed with exporting the positive voltage signal of the voltage signal of the amplification or negative voltage
Number；The change-over circuit is connected with the output end of the rectification circuit, for the amplification that exports the rectification circuit
Positive voltage signal or the negative voltage signal of the amplification are converted to approximate DC voltage.
Preferably, the relatively amplifying circuit includes operational amplifier.The operational amplifier includes positive power source terminal, born
Power end, normal phase input end, inverting input and output end, positive power source terminal and the malleation DC voltage phase of the operational amplifier
Even, the negative power end of the operational amplifier is connected or is grounded with negative pressure DC voltage, the positive input of the operational amplifier
End receives the AC signal to be detected, the inverting input of the operational amplifier receive it is described refer to DC voltage, it is described
The output end of operational amplifier is connected with the rectification circuit.
Preferably, the relatively amplifying circuit includes operational amplifier.The operational amplifier includes positive power source terminal, born
Power end, normal phase input end, inverting input and output end, positive power source terminal and the malleation DC voltage phase of the operational amplifier
Even, the negative power end of the operational amplifier is connected or is grounded with negative pressure DC voltage, the positive input of the operational amplifier
End reception is described to refer to DC voltage, and the inverting input of the operational amplifier receives the AC signal to be detected, described
The output end of operational amplifier is connected with the rectification circuit.
Preferably, the relatively amplifying circuit includes slide rheostat.The first end of the slide rheostat with it is described
The positive power source terminal of operational amplifier connection is connected, the second end ground connection of the slide rheostat, and the 3rd of the slide rheostat the
Hold and described refer to DC voltage for exporting；Or the first end of the slide rheostat be connected with the operational amplifier it is negative
Power end is connected, and the second end ground connection of the slide rheostat, the partial pressure of the three-polar output of the slide rheostat is as institute
State and refer to DC voltage；Or the first end of the slide rheostat is connected with the positive power source terminal that the operational amplifier is connected,
Second end of the slide rheostat is connected with the negative power end that the operational amplifier is connected, and the 3rd of the slide rheostat the
End output is described to refer to DC voltage.
Preferably, the rectification circuit includes the first diode.The anode of first diode is put with the comparison
The output end of big circuit is connected, and the negative electrode of first diode is connected with the change-over circuit.
Preferably, the rectification circuit includes the second diode, negative electrode and the comparison of second diode are put
The output end of big circuit is connected, and the anode of second diode is connected with change-over circuit.Preferably, the rectification circuit bag
Include switch element, the first diode, the second diode.The first end connection of the switch element is described to compare the defeated of amplifying circuit
Go out end, the second end of the switch element is connected with the anode of first diode, the 3rd end of the switch element and institute
The negative electrode for stating the second diode is connected, and the anode of the negative electrode of first diode and second diode is and change-over circuit
It is connected.
Preferably, the change-over circuit includes first resistor and the first electric capacity.The first end of the first resistor and institute
The output end for stating rectification circuit is connected, and the second end of the first resistor is connected with the first end of first electric capacity, and described
The second end ground connection of one electric capacity.
Preferably, the change-over circuit also includes second resistance and the second electric capacity.The first end of the second resistance with
The output end of the rectification circuit is connected, the second end ground connection of the second resistance, the first end of second electric capacity and rectification
The output end of circuit is connected, the second end ground connection of second electric capacity.
The present invention also proposes a kind of signal supervisory instrument, including above-mentioned signal deteching circuit.
The present invention proposes a kind of signal deteching circuit, including compares amplifying circuit, rectification circuit and change-over circuit, compares and puts
Big circuit is used for the voltage of AC signal more to be detected and refers to DC voltage, and according to one amplification of comparative result output
Voltage signal；Rectification circuit output end of amplifying circuit compared with is connected, the electricity for the amplification to comparing amplifying circuit output
Signal is pressed to carry out rectification, with the positive voltage signal or negative voltage signal of the voltage signal of output amplification；Change-over circuit and rectified current
The output end on road is connected, and the positive voltage signal of amplification or the negative voltage signal of amplification for rectification circuit to be exported are converted to closely
Like DC voltage.This circuit detects the size of the approximate DC voltage signal of output, judged by inputting AC signal to be detected
The whether normal output display voltage signal of PCBA board, further to detect PCBA board, whether mistake is burnt or burnt in program leakage.The present invention
The signal supervisory instrument of offer, detection process is convenient not to influence production capacity again, greatly improves its applicability.
Brief description of the drawings
Fig. 1 is the structure principle chart of the signal deteching circuit of the embodiment of the present invention.
Fig. 2 is the circuit diagram that the signal positive polarity of first embodiment of the invention detects.
Fig. 3 is the oscilloscope signal detection figure of the circuit of first embodiment of the invention.
Fig. 4 is the circuit diagram that the signal negative polarity of second embodiment of the invention detects.
Fig. 5 is the oscilloscope signal detection figure of the circuit of second embodiment of the invention.
Fig. 6 is the circuit diagram that the signal negative polarity of third embodiment of the invention detects.
Fig. 7 is the circuit diagram of the signal detection of fourth embodiment of the invention.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, but not as the limit to the present invention
It is fixed.
Fig. 1 is refer to, Fig. 1 is the structure principle chart of the alternating current signal detection circuit of the embodiment of the present invention.In Fig. 1, this hair
The alternating current signal detection circuit of bright proposition includes comparing amplifying circuit 1, rectification circuit 2 and change-over circuit 3.
Wherein, voltage and reference DC voltage Vref that amplifying circuit 1 is used for AC signal Vin more to be detected are compared
(not shown in Fig. 1, refer to Fig. 2, Fig. 4, Fig. 6 or Fig. 7), and a voltage signal amplified is exported according to comparative result.It is whole
The output end of amplifying circuit 1 compared with of current circuit 2 is connected, and the voltage signal for the amplification to comparing the output of amplifying circuit 1 enters
Row rectification, with the positive voltage signal or negative voltage signal of the voltage signal of output amplification.Change-over circuit 3 is defeated with rectification circuit 2
Go out end to be connected, the positive voltage signal of amplification or the negative voltage signal of amplification for rectification circuit 2 to be exported are converted to approximate straight
Voltage is flowed, and is exported as detection output signal Vout.
Fig. 2 is the circuit diagram that the signal positive polarity of first embodiment of the invention detects.Comparing amplifying circuit 1 includes a fortune
Calculate amplifier 11.Operational amplifier 11 includes positive power source terminal, negative power end, normal phase input end, negative-phase input and output end.
In the present embodiment, the positive power source terminal of operational amplifier 11 and malleation direct current voltage vcc+be connected, operational amplifier
11 negative power end is connected with negative pressure DC voltage Vcc-, and the normal phase input end of operational amplifier 11 receives AC signal to be detected
Vin, the inverting input of operational amplifier 11, which receives, refers to DC voltage Vref, the output end and rectified current of operational amplifier 11
Road 2 is connected.
In the present embodiment, preferably, comparing amplifying circuit 1 includes slide rheostat 12.The of slide rheostat 12
The positive power source terminal that one end is connected with operational amplifier 11 is connected, the second end ground connection of slide rheostat 12, slide rheostat 12
3rd end, which is used to export, refers to DC voltage.
Rectification circuit 2 includes the output end phase of the first diode D1, the first diode D1 anode amplifying circuit 1 compared with
Even.
Change-over circuit 3 includes first resistor R1 and the first electric capacity C1.First resistor R1 first end is defeated with rectification circuit 2
Go out end to be connected, first resistor R1 the second end is connected with the first electric capacity C1 first end, the first electric capacity C1 the second end ground connection.The
One electric capacity C1 first end output detection output signal Vout.
In the present embodiment, preferably, change-over circuit also includes second resistance R2 and the second electric capacity C2.Second resistance R2
First end be connected with the output end of rectification circuit 2, second resistance R2 the second end ground connection, the second electric capacity C2 first end with it is whole
The output end of current circuit 2 is connected, the second electric capacity C2 the second end ground connection.
When detecting circuit work, the normal phase input end of operational amplifier 11 receives AC signal Vin to be detected, and its is anti-phase
Input, which receives, refers to DC voltage Vref, voltage and reference of the operational amplifier 11 for AC signal Vin more to be detected
DC voltage Vref.In the present embodiment, slide rheostat 12 refers to direct current to positive pressure direct stream voltage vcc+carry out partial pressure output
Voltage Vref.
In the present embodiment, when AC signal Vin to be detected instantaneous voltage value is more than the electricity with reference to DC voltage Vref
During pressure value, the output end output of operational amplifier 11 is positive voltage signal, and the magnitude of voltage of the positive voltage signal is operational amplifier
11 normal phase input end input signal and the value of magnification of the voltage difference of inverting input input signal.The positive voltage signal passes through again
Rectification circuit 2 is input to after crossing conversion, and the first diode D1 of rectification circuit 2 has unilateral conduction, the first diode D1
Anode turn on when connecing positive voltage, then rectification circuit 2 exports positive voltage signal.When AC signal Vin to be detected instantaneous voltage
When value is less than the magnitude of voltage with reference to DC voltage Vref, the output end output of operational amplifier 11 is negative voltage signal, the negative electricity
The magnitude of voltage of pressure signal is voltage difference of the normal phase input end input signal with inverting input input signal of operational amplifier 11
The value of magnification of value.The negative voltage signal is input to rectification circuit 2 after conversion again, and the first diode D1 of rectification circuit 2
With unilateral conduction, the first diode D1 anodes end when connecing negative voltage, then the output voltage of rectification circuit 2 is zero.
In the present embodiment, when maximum electricity of the magnitude of voltage with reference to DC voltage Vref less than AC signal Vin to be detected
When pressure value and minimum amount of voltage that more than AC signal Vin to be detected, compare the output of amplifying circuit 1 for one with positive voltage and
The square-wave signal of negative voltage.Specifically, the Vin of AC signal to be detected instantaneous voltage value, which is more than, refers to DC voltage Vref
Magnitude of voltage when, square-wave signal is positive voltage waveform, and detection signal Vin instantaneous voltage value, which is less than, refers to DC voltage Vref
Magnitude of voltage when, square-wave signal is negative electricity corrugating.The positive voltage value of square-wave signal and AC signal Vin to be detected are most
Big magnitude of voltage and the difference direct proportionality with reference to DC voltage Vref, the negative value of square-wave signal exchange with to be detected
Signal Vin minimum amount of voltage that and the difference direct proportionality with reference to DC voltage Vref.Compare the output letter of amplifying circuit 1
After number rectified circuit 2 carries out rectification, export as a square-wave signal with positive voltage and no-voltage.In change-over circuit 3,
First resistor R1 and the first electric capacity C1 is composed in series an integrating circuit, the first electric capacity C1 first end output detection output signal
Vout, detection output signal Vout are approximate DC voltage signal being exported after one section of stabilization time.Wherein, first is increased
The first electric capacity C1 of resistance R1 or increasing capacity will all increase the attenuation of alternating component, improve filter effect, meanwhile, circuit
Time constant also increase, approximate DC voltage signal more tends to be steady, and can be considered as d. c. voltage signal to use.
Further, second resistance R2 and the second electric capacity C2 forms an electric discharge mu balanced circuit, can reduce first resistor R1 and first
The stabilization time of the output signal for the integrating circuit that electric capacity C1 is composed in series, wherein, second resistance R2 can make the first electric capacity C1 and
Ground connection is discharged after electric charge on second electric capacity C2 flows through itself, plays a part of protection circuit.
So when positive polarity detects, AC signal Vin to be detected more than reference DC voltage Vref AC signal
An approximate DC voltage signal is translated into, i.e., it is maximum to be less than AC signal Vin positive polarity voltages to be detected when given one
During the reference DC voltage Vref of value, detection output signal Vout is an approximate DC voltage signal, can be surveyed with universal meter
Measure its magnitude of voltage.The circuit of the present embodiment is used for the positive signal output situation for detecting AC signal Vin to be detected, if voltage
When value numerical value is more or less the same with predetermined value, then confirm that PCBA board output display voltage signal is normal；If magnitude of voltage numerical value with it is pre-
When fixed number value difference is larger, then confirm that PCBA board output display voltage signal is abnormal, it should further detection PCBA board whether journey
Mistake is burnt or burnt in sequence leakage, wherein, predetermined value can pass through maximum voltage value during AC signal Vin to be detected normal output, ginseng
Examine DC voltage Vref magnitude of voltage etc. and calculate gained.Its detection process is convenient not to influence production capacity again, and it is suitable to greatly improve it
The property used.
The present embodiment does not limit the connection of the positive power source terminal and negative power end of operational amplifier 11, such as operational amplifier 11
Negative power end can be grounded, and still have amplification to a part for input signal, and after the rectification of rectified circuit 2, input turns
The input signal for changing circuit 3 is identical.
Fig. 3 is the oscilloscope signal detection figure of the circuit of first embodiment of the invention.As shown in figure 3, the waveform of display is
One sawtooth waveforms AC signal and a horizontal d. c. voltage signal, wherein, the signal to be detected of the circuit of first embodiment
Vin is sawtooth waveforms AC signal, and detection output signal Vout is horizontal d. c. voltage signal.
Fig. 4 is the circuit diagram that the signal negative polarity of second embodiment of the invention detects.Second embodiment and first embodiment
Essentially identical, it the difference is that only：Compare the first end and operational amplifier 11 of the slide rheostat 12 of amplifying circuit 1
Negative power end is connected, the second end ground connection, the inverting input of three-terminal link operational amplifier 11.The two or two of rectification circuit 2
Pole pipe D2 negative electrode output end of amplifying circuit 1 compared with is connected.
When detecting circuit work, the normal phase input end of operational amplifier 11 receives AC signal Vin to be detected, and its is anti-phase
Input, which receives, refers to DC voltage Vref, voltage and reference of the operational amplifier 11 for AC signal Vin more to be detected
DC voltage Vref.In the present embodiment, slide rheostat 12 carries out partial pressure output to negative pressure DC voltage Vcc- and refers to direct current
Voltage Vref.
In the present embodiment, when AC signal Vin to be detected instantaneous voltage value is more than the electricity with reference to DC voltage Vref
During pressure value, the output end output of operational amplifier 11 is positive voltage signal, and the magnitude of voltage of the positive voltage signal is operational amplifier
11 normal phase input end input signal and the value of magnification of the voltage difference of inverting input input signal.The positive voltage signal passes through again
Rectification circuit 2 is input to after crossing conversion, and the second diode D2 of rectification circuit 2 has unilateral conduction, the second diode D2
Negative electrode end when connecing positive voltage, then the output voltage of rectification circuit 2 is zero.When AC signal Vin to be detected instantaneous voltage value
During less than magnitude of voltage with reference to DC voltage Vref, the output end output of operational amplifier 11 is negative voltage signal, the negative voltage
The magnitude of voltage of signal is voltage difference of the normal phase input end input signal with inverting input input signal of operational amplifier 11
Value of magnification.The negative voltage signal is input to rectification circuit 2 after conversion again, and the second diode D2 of rectification circuit 2 has
There is unilateral conduction, the second diode D2 negative electrode turns on when connecing negative voltage, then rectification circuit 2 exports negative voltage signal.
In the present embodiment, when maximum electricity of the magnitude of voltage with reference to DC voltage Vref less than AC signal Vin to be detected
When pressure value and minimum amount of voltage that more than AC signal Vin to be detected, compare the output of amplifying circuit 1 for one with positive voltage and
The square-wave signal of negative voltage.Specifically, the Vin of AC signal to be detected instantaneous voltage value, which is more than, refers to DC voltage Vref
Magnitude of voltage when, square-wave signal is positive voltage waveform, and detection signal Vin instantaneous voltage value, which is less than, refers to DC voltage Vref
Magnitude of voltage when, square-wave signal is negative electricity corrugating.The positive voltage value of square-wave signal and AC signal Vin to be detected are most
Big magnitude of voltage and the difference direct proportionality with reference to DC voltage Vref, the negative value of square-wave signal exchange with to be detected
Signal Vin minimum amount of voltage that and the difference direct proportionality with reference to DC voltage Vref.Compare the output letter of amplifying circuit 1
After number rectified circuit 2 carries out rectification, export as a square-wave signal with negative voltage and no-voltage.In change-over circuit 3,
First resistor R1 and the first electric capacity C1 is composed in series an integrating circuit, the first electric capacity C1 first end output detection output signal
Vout, detection output signal Vout is being that output is approximate DC voltage signal after one section of stabilization time.Wherein, the is increased
The first electric capacity C1 of one resistance R1 or increasing capacity will all increase the attenuation of alternating component, improve filter effect, meanwhile, electricity
The time constant on road also increases, and approximate DC voltage signal more tends to be steady, and can be considered as d. c. voltage signal to make
With.Further, second resistance R2 and the second electric capacity C2 form an electric discharge mu balanced circuit, can reduce first resistor R1 and the
The stabilization time of the output signal for the integrating circuit that one electric capacity C1 is composed in series, wherein, second resistance R2 can make the first electric capacity C1
Ground connection is discharged after flowing through itself with the electric charge on the second electric capacity C2, plays a part of protection circuit.
So when negative polarity detects, AC signal Vin to be detected below reference DC voltage Vref AC signal
An approximate DC voltage signal is translated into, i.e., it is minimum to be more than AC signal Vin reverse voltages to be detected when given one
During the reference DC voltage Vref of value, detection output signal Vout is that an output is approximate DC voltage signal, can use ten thousand
Its magnitude of voltage is measured with table.The circuit of the present embodiment is used for the minus polarity signal output situation for detecting AC signal Vin to be detected,
If magnitude of voltage numerical value is more or less the same with predetermined value, confirm that PCBA board output display voltage signal is normal；If magnitude of voltage number
When value differs larger with predetermined value, then confirm that PCBA board output display voltage signal is abnormal, it should further detect PCBA board
Whether mistake is burnt or burnt in program leakage, wherein, predetermined value can pass through minimum voltage during AC signal Vin to be detected normal output
It is worth, calculates gained with reference to DC voltage Vref magnitude of voltage etc..Its detection process is convenient not to influence production capacity again, greatly improves
Its applicability.
Fig. 5 is the oscilloscope signal detection figure of the circuit of second embodiment of the invention.As shown in figure 5, the waveform of display is
One sawtooth waveforms AC signal and a horizontal d. c. voltage signal, wherein, the signal to be detected of the circuit of second embodiment
Vin is sawtooth waveforms AC signal, and detection output signal Vout is horizontal d. c. voltage signal.
Fig. 6 is the circuit diagram that the signal negative polarity of third embodiment of the invention detects.3rd embodiment and second embodiment
Essentially identical, it the difference is that only：The normal phase input end for comparing the operational amplifier 11 of amplifying circuit 1 receives reference voltage
Signal Vref, the inverting input of operational amplifier 11 receive AC signal Vin to be detected；The first end of slide rheostat 12 with
Negative power end is connected, and its second end ground connection, its 3rd end is connected with the normal phase input end of operational amplifier 11.Rectification circuit 2
The output end of amplifying circuit 1 is compared in first diode D1 anode connection.Change-over circuit 3 includes 3rd resistor R3 and the 3rd electric capacity
C3,3rd resistor R3 first end are connected with the second electric capacity C2 first end, 3rd resistor R3 the second end and the 3rd electric capacity C3
First end be connected, the 3rd electric capacity C3 the second end ground connection, the 3rd electric capacity C3 first end output detection output voltage Vout.
Compared with second embodiment, the positive of the operational amplifier 11 of the setting of comparison amplifying circuit 1 of 3rd embodiment is defeated
Enter end reception and refer to DC voltage Vref, inverting input receives AC signal Vin to be detected, when with reference to DC voltage Vref's
When maximum voltage value of the magnitude of voltage less than AC signal Vin to be detected and the minimum amount of voltage that more than AC signal Vin to be detected,
Compare the output of amplifying circuit 1 for a square wave with positive voltage and negative voltage.Specifically, the Vin of AC signal to be detected
Instantaneous voltage value when being less than the magnitude of voltage with reference to DC voltage Vref, square-wave signal is positive voltage waveform, detection signal Vin
Instantaneous voltage value be more than with reference to DC voltage Vref magnitude of voltage when, square-wave signal is negative electricity corrugating.Square-wave signal
Positive voltage value and AC signal Vin to be detected minimum amount of voltage that and the difference pass in direct ratio with reference to DC voltage Vref
System, maximum voltage value of the negative value of square-wave signal with AC signal Vin to be detected and the difference with reference to DC voltage Vref
It is worth direct proportionality.After the rectified progress of circuit 2 rectification of output signal for comparing amplifying circuit 1, export as one with just
The square-wave signal of voltage and no-voltage.In the present embodiment, further, in change-over circuit 3, filtered by the second electric capacity C2
Voltage afterwards is then added to the integrating circuit of 3rd resistor R3 and the 3rd electric capacity C3 compositions, and the 3rd electric capacity C3 is further to alternating component
It is filtered, only a small amount of alternating current is by the 3rd electric capacity C3, therefore the detection of the 3rd electric capacity C3 first end output is defeated
It is an approximate DC voltage signal to go out signal Vout, and the approximate DC voltage signal is after the filtering of multiple integrating circuit
Signal, therefore the approximate DC voltage signal alternating component exported is less, and voltage is more stable, can be considered as direct current
Signal is pressed to use.
So when negative polarity detects, AC signal Vin to be detected below reference DC voltage Vref AC signal
An approximate DC voltage signal is translated into, i.e., it is minimum to be more than AC signal Vin reverse voltages to be detected when given one
During the reference DC voltage Vref of value, detection output voltage is an approximate DC voltage signal, can measure it with universal meter
Magnitude of voltage.The circuit of the present embodiment is used for the minus polarity signal output situation for detecting AC signal Vin to be detected, if magnitude of voltage number
When value is more or less the same with predetermined value, then confirm that PCBA board output display voltage signal is normal；If magnitude of voltage numerical value and predetermined number
When value difference is larger, then confirm that PCBA board output display voltage signal is abnormal, it should which further detection PCBA board whether leak by program
Burn or burn it is wrong, wherein, predetermined value can by minimum amount of voltage that during AC signal Vin to be detected normal output, with reference to straight
Flow voltage Vref magnitude of voltage etc. and calculate gained.Its detection process is convenient not to influence production capacity again, greatly improves its applicability.
Fig. 7 is the circuit diagram of the signal detection of fourth embodiment of the invention.Fourth embodiment and the basic phase of second embodiment
Together, it the difference is that only：Compare the first end of the slide rheostat 12 of amplifying circuit 1 and the positive supply of operational amplifier 11
End is connected, and its second end is connected with the negative power end of operational amplifier 11, its 3rd end and the anti-phase input of operational amplifier 11
End is connected.Rectification circuit 2 includes switch element 21, the first diode D1, the second diode D2, and the present embodiment is specifically configured to one
The output end of amplifying circuit 1 is compared in individual single-pole double-throw switch (SPDT) element 21, the first end connection of single-pole double-throw switch (SPDT) element 21, and it the
Two ends are connected with the first diode D1 anode, and its 3rd end is connected with the second diode D2 negative electrode, the first diode D1's
Negative electrode and the second diode D2 anode are connected with change-over circuit 3.
The present embodiment is that selection connects different circuit elements, respectively to exchange to be detected by setting switch element
Signal Vin positive signal and minus polarity signal is detected.Specifically, this voltage detecting circuit slides variable resistance by adjusting
Device 12 make it that with reference to DC voltage Vref be a positive voltage or negative voltage, and selects to connect by single-pole double-throw switch (SPDT) element 21
First diode D1 or the second diode D2, positive polarity inspection is carried out for AC signal to be detected when connecting the first diode D1
Survey, negative polarity detection is carried out for AC signal to be detected when connecting the second diode D2.
Specific work process refers to first embodiment and second embodiment, is no longer described in detail herein.The circuit of the present embodiment
For detecting AC signal Vin to be detected positive signal and minus polarity signal output situation, if magnitude of voltage numerical value is with making a reservation for
When numerical value is more or less the same, then confirm that PCBA board output display voltage signal is normal；If magnitude of voltage numerical value differed with predetermined value compared with
When big, then confirming that PCBA board output display voltage signal is abnormal, it should whether mistake is burnt or burnt in program leakage to further detection PCBA board,
Wherein, predetermined value can pass through maximum voltage value during AC signal Vin to be detected normal output or minimum amount of voltage that, reference
DC voltage Vref magnitude of voltage etc. calculates gained.Its detection process is convenient not to influence production capacity again, greatly improves it and is applicable
Property.
The present invention also provides a kind of signal supervisory instrument, and it includes the signal deteching circuit of any of the above-described embodiment.This hair
The signal supervisory instrument of bright offer, detection process is convenient not to influence production capacity again, greatly improves its applicability.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to invent, any person skilled in the art,
Do not departing from the range of inventive technique scheme, when the technology contents using the disclosure above make a little change or are modified to equivalent
The equivalent embodiment of change, as long as being without departing from inventive technique scheme content, the technical spirit according to invention is to above example
Any simple modification, equivalent change and modification made, in the range of still falling within technical solution of the present invention.
Claims (10)
1. a kind of signal deteching circuit, it is characterised in that including comparing amplifying circuit, rectification circuit and change-over circuit；
The relatively amplifying circuit, the voltage for AC signal more to be detected are tied with referring to DC voltage, and according to comparing
Fruit exports the voltage signal of an amplification；
The rectification circuit, the output end of amplifying circuit is connected compared with described, for the relatively amplifying circuit output
The voltage signal of amplification carries out rectification, to export the positive voltage signal of the voltage signal of the amplification or negative voltage signal；
The change-over circuit, it is connected with the output end of the rectification circuit, for the amplification for exporting the rectification circuit
Positive voltage signal or the negative voltage signal of the amplification be converted to DC voltage.
2. signal deteching circuit as claimed in claim 1, it is characterised in that the relatively amplifying circuit includes operation amplifier
Device；
The operational amplifier includes positive power source terminal, negative power end, normal phase input end, inverting input and output end, the fortune
The positive power source terminal for calculating amplifier is connected with malleation DC voltage, negative power end and the negative pressure DC voltage phase of the operational amplifier
Even or ground connection, the normal phase input end of the operational amplifier receives the AC signal to be detected, the operational amplifier it is anti-
The reception of phase input is described to refer to DC voltage, and the output end of the operational amplifier is connected with the rectification circuit.
3. signal deteching circuit as claimed in claim 1, it is characterised in that the relatively amplifying circuit includes operation amplifier
Device；
The operational amplifier includes positive power source terminal, negative power end, normal phase input end, inverting input and output end, the fortune
The positive power source terminal for calculating amplifier is connected with malleation DC voltage, negative power end and the negative pressure DC voltage phase of the operational amplifier
Even or ground connection, the normal phase input end of the operational amplifier receive it is described refer to DC voltage, the operational amplifier it is anti-phase
Input receives the AC signal to be detected, and the output end of the operational amplifier is connected with the rectification circuit.
4. signal deteching circuit as claimed in claim 2 or claim 3, it is characterised in that the relatively amplifying circuit, which includes sliding, to be become
Hinder device；
The positive power source terminal that the first end of the slide rheostat is connected with the operational amplifier is connected, the slide rheostat
Second end is grounded, and the 3rd end of the slide rheostat, which is used to exporting, described refers to DC voltage；Or the slide rheostat
First end be connected with the negative power end that the operational amplifier is connected, the second end of slide rheostat ground connection, the cunning
The partial pressure for moving rheostatic three-polar output refers to DC voltage as described；Or first end and the institute of the slide rheostat
The positive power source terminal for stating operational amplifier connection is connected, and what the second end of the slide rheostat was connected with the operational amplifier bears
Power end is connected, and DC voltage is referred to described in the three-polar output of the slide rheostat.
5. signal deteching circuit as claimed in claim 1, it is characterised in that the rectification circuit includes the first diode, institute
The anode of the first diode output end of amplifying circuit compared with described is stated to be connected, the negative electrode of first diode with described turn
Circuit is changed to be connected.
6. signal deteching circuit as claimed in claim 1, it is characterised in that the rectification circuit includes the second diode, institute
State the negative electrode of the second diode output end of amplifying circuit compared with described to be connected, anode and the conversion electricity of second diode
Road is connected.
7. signal deteching circuit as claimed in claim 1, it is characterised in that the rectification circuit includes switch element, first
Diode, the second diode, the output end of the first end connection relatively amplifying circuit of the switch element, the switch member
Second end of part is connected with the anode of first diode, the 3rd end of the switch element and the moon of second diode
Extremely it is connected, the anode of the negative electrode of first diode and second diode is connected with change-over circuit.
8. signal deteching circuit as claimed in claim 1, it is characterised in that the change-over circuit includes first resistor and first
Electric capacity, the first end of the first resistor are connected with the output end of the rectification circuit, the second end of the first resistor and institute
The first end for stating the first electric capacity is connected, the second end ground connection of first electric capacity.
9. signal deteching circuit as claimed in claim 8, it is characterised in that the change-over circuit also includes second resistance and the
Two electric capacity, the first end of the second resistance are connected with the output end of the rectification circuit, the second termination of the second resistance
Ground, the first end of second electric capacity are connected with the output end of rectification circuit, the second end ground connection of second electric capacity.
10. a kind of signal supervisory instrument, including signal deteching circuit, it is characterised in that the signal deteching circuit will for right
Seek the signal deteching circuit described in 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710801545.6A CN107462765A (en) | 2017-09-07 | 2017-09-07 | A kind of signal deteching circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710801545.6A CN107462765A (en) | 2017-09-07 | 2017-09-07 | A kind of signal deteching circuit and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107462765A true CN107462765A (en) | 2017-12-12 |
Family
ID=60552008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710801545.6A Pending CN107462765A (en) | 2017-09-07 | 2017-09-07 | A kind of signal deteching circuit and device |
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| Country | Link |
|---|---|
| CN (1) | CN107462765A (en) |
Cited By (2)
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| CN111505480A (en) * | 2020-03-31 | 2020-08-07 | 惠州市德赛西威汽车电子股份有限公司 | Negative voltage detection circuit based on operational amplifier |
| CN113699223A (en) * | 2021-10-29 | 2021-11-26 | 成都齐碳科技有限公司 | Nanopore sequencing circuit, sequencing method and device |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant after: InfoVision Optoelectronics(Kunshan)Co.,Ltd. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |
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Application publication date: 20171212 |
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