CN109100564B - Signal fluctuation detection circuit - Google Patents
Signal fluctuation detection circuit Download PDFInfo
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- CN109100564B CN109100564B CN201710473957.1A CN201710473957A CN109100564B CN 109100564 B CN109100564 B CN 109100564B CN 201710473957 A CN201710473957 A CN 201710473957A CN 109100564 B CN109100564 B CN 109100564B
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Abstract
The invention discloses a signal fluctuation detection circuit, which comprises a comparator, a first change module and a second change module, wherein the comparator is used for comparing the first change module with the second change module; the first input end and the second input end of the comparator are respectively connected with the output end of the first change module and the output end of the second change module, the input end of the first change module and the input end of the second change module are respectively connected with a signal for fluctuation detection, and the first change module determines a first output voltage according to a set first reference voltage and the amplitude of a positive pulse generated by the signal; the second change module determines a second output voltage according to a set second reference voltage and the amplitude of the negative pulse generated by the signal; the comparator outputs a comparison result according to the first output voltage and the second output voltage. In the embodiment of the invention, the signal fluctuation detection circuit only comprises one comparator, so that the volume and the energy consumption of the signal fluctuation detection circuit are reduced, the cost for manufacturing the signal fluctuation detection circuit is reduced, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to a signal fluctuation detection circuit.
Background
In the field of signal transmission, there has been a problem that an abnormal fluctuation of a signal generates some pulse fluctuation higher than a normal signal pulse amplitude on the signal when a transmission medium of the signal is damaged and there is an external signal interference, and the pulse fluctuation is generally in both positive and negative directions. In order to detect this positive and negative pulse fluctuation above the normal signal pulse amplitude, a signal fluctuation detection circuit is necessary.
As shown in fig. 1, a negative phase input terminal and a positive phase input terminal of a comparator U1 are connected to a power supply Vcc and a signal for detecting fluctuation, respectively, and if the voltage of the signal for detecting fluctuation is higher than the output voltage of the power supply Vcc, the comparator U1 outputs a high level, otherwise, the comparator U1 outputs a low level; the negative phase input terminal and the positive phase input terminal of the comparator U2 are connected to a power supply Vdd and a signal for fluctuation detection, respectively, and output a high level if the voltage of the signal for fluctuation detection is lower than the output voltage of Vdd, and otherwise output a low level, wherein the output voltage of the power supply Vcc is higher than the output voltage of the power supply Vdd. Meanwhile, because two output ends of the two comparators are respectively connected together through the diodes, if one of the comparator U1 and the comparator U2 outputs a high level, the comparison result output by the signal fluctuation detection circuit is the high level, and only when the comparator U1 and the comparator U2 both output a low level, the comparison result output by the signal fluctuation detection circuit is the low level, thereby realizing the fluctuation detection.
However, the signal fluctuation detection circuit in the prior art includes two comparators, because the size is difficult to be made small when the circuit is laid out due to the large volume of the comparator, and because the value and the energy consumption of the comparator are high, a small burden is caused to the purchase and the use of a user, and the user experience is influenced.
Disclosure of Invention
The invention provides a signal fluctuation detection circuit, which is used for solving the problems of large volume, high cost and high energy consumption of the signal fluctuation detection circuit in the prior art.
The invention discloses a signal fluctuation detection circuit, which comprises a comparator, a first change module and a second change module, wherein the comparator is used for comparing the first change module with the second change module; wherein,
the input end of the first change module is connected with a signal for fluctuation detection, the output end of the first change module is connected with the first input end of the comparator, the first change module is used for outputting a first output voltage to the comparator if positive pulse fluctuation of the signal is detected, wherein the first output voltage is the sum of a first reference voltage and positive pulse amplitude, and if positive pulse fluctuation of the signal is not detected, the first output voltage with the value of the first reference voltage is output to the comparator;
the input end of the second change module is connected with a signal for fluctuation detection, the output end of the second change module is connected with the second input end of the comparator, the second change module is used for outputting a second output voltage to the comparator if negative pulse fluctuation of the signal is detected, wherein the second output voltage is the difference between a second reference voltage and the amplitude of the negative pulse, and if no negative pulse fluctuation of the signal is detected, the second output voltage with the value of the second reference voltage is output to the comparator, wherein the second reference voltage is greater than the first reference voltage, and the first reference voltage or the second reference voltage is the same as the voltage when no fluctuation of the signal occurs;
and the comparator outputs a comparison result according to a first output voltage input by the first input end and a second output voltage input by the second input end.
Further, the first variation module comprises a first power supply, a first resistor, a second resistor, a first diode and a first capacitor; wherein,
the first power supply is connected with the first resistor and the second resistor in series, one end, which is not connected with the first resistor, of the second resistor is grounded, the anode of the first diode is connected with the first capacitor, one end, which is not connected with the first diode, of the first capacitor is connected with a signal for fluctuation detection, the cathode of the first diode is connected with a serial connection point of the first resistor and the second resistor and is connected with the first input end of the comparator, and when the signal does not fluctuate, the voltage at two ends of the second resistor is the same as the first reference voltage.
Further, if the second reference voltage is the same as the voltage of the signal when the signal does not fluctuate, the second variation module comprises a second power supply, a third resistor and a second diode; wherein,
the second power supply is sequentially connected with the third resistor and the anode of a second diode, the cathode of the second diode is connected with a signal for fluctuation detection, the serial connection point of the second diode and the third resistor is connected with the second input end of the comparator, and the output voltage of the second power supply is the same as the second reference voltage.
Further, the second variation module further comprises a second capacitance; wherein the second capacitor is connected in parallel with the third resistor.
Further, the second variation module comprises a third power supply, a fourth resistor, a fifth resistor, a third diode and a third capacitor; wherein,
the third power supply is connected with the fourth resistor and the fifth resistor in series, one end of the fifth resistor, which is not connected with the fourth resistor, is grounded, the negative electrode of the third diode is connected with the third capacitor, one end of the third capacitor, which is not connected with the third diode, is connected with a signal for fluctuation detection, the positive electrode of the third diode is connected with a serial connection point of the fourth resistor and the fifth resistor and is connected with the second input end of the comparator, and when the signal does not fluctuate, the voltage at two ends of the fifth resistor is the same as the second reference voltage.
Further, the first variation module comprises a first power supply, a first resistor, a second resistor, a first diode and a first capacitor; wherein,
the first power supply is connected with the first resistor and the second resistor in series, one end, which is not connected with the first resistor, of the second resistor is grounded, the anode of the first diode is connected with the first capacitor, one end, which is not connected with the first diode, of the first capacitor is connected with a signal for fluctuation detection, the cathode of the first diode is connected with a serial connection point of the first resistor and the second resistor and is connected with the first input end of the comparator, and when the signal does not fluctuate, the voltage at two ends of the second resistor is the same as the first reference voltage.
Further, if the first reference voltage is the same as the voltage of the signal when the signal does not fluctuate, the first change module comprises a fourth power supply, a sixth resistor and a fourth diode; wherein,
the fourth power supply is sequentially connected with the sixth resistor and the cathode of a fourth diode, the anode of the fourth diode is connected with a signal for fluctuation detection, the serial connection point of the fourth diode and the sixth resistor is connected with the first input end of the comparator, and the output voltage of the fourth power supply is the same as the first reference voltage.
Further, the first variation module further comprises a fourth capacitor; wherein the fourth capacitor is connected in parallel with the sixth resistor.
The invention discloses a signal fluctuation detection circuit, which comprises a comparator, a first change module and a second change module, wherein the comparator is used for comparing the first change module with the second change module; the input end of the first change module is connected with a signal for fluctuation detection, the output end of the first change module is connected with the first input end of the comparator, the first change module is used for outputting a first output voltage to the comparator if positive pulse fluctuation of the signal is detected, wherein the first output voltage is the sum of a first reference voltage and positive pulse amplitude, and if positive pulse fluctuation of the signal is not detected, the first output voltage with the value of the first reference voltage is output to the comparator; the input end of the second change module is connected with a signal for fluctuation detection, the output end of the second change module is connected with the second input end of the comparator, the second change module is used for outputting a second output voltage to the comparator if negative pulse fluctuation of the signal is detected, wherein the second output voltage is the difference between a second reference voltage and the amplitude of the negative pulse, and if no negative pulse fluctuation of the signal is detected, the second output voltage with the value of the second reference voltage is output to the comparator, wherein the second reference voltage is greater than the first reference voltage, and the first reference voltage or the second reference voltage is the same as the voltage when no fluctuation of the signal occurs; and the comparator outputs a comparison result according to a first output voltage input by the first input end and a second output voltage input by the second input end. In the embodiment of the invention, the first change module determines the first output voltage according to the set first reference voltage and the amplitude of the positive pulse of the signal generation, the second change module determines the second output voltage according to the set second reference voltage and the amplitude of the negative pulse of the signal generation, the comparator determines whether the signal generates pulse fluctuation exceeding a normal range or not by comparing the first output voltage with the second output voltage, and the signal fluctuation detection circuit can complete the detection of the signal fluctuation only through one comparator, thereby reducing the volume and energy consumption of the signal fluctuation detection circuit and the cost for manufacturing the signal fluctuation detection circuit, and improving the user experience.
Drawings
FIG. 1 is a schematic diagram of a surge detection circuit provided in the prior art;
fig. 2 is a schematic diagram of a fluctuation detection circuit provided in embodiment 1 of the present invention;
fig. 3 is a schematic circuit diagram of a first variation module according to embodiment 2 of the present invention;
fig. 4 is a circuit schematic diagram of a second variation module according to embodiment 3 of the present invention;
fig. 5 is a circuit schematic diagram of a second variation module according to embodiment 3 of the present invention;
fig. 6 is a schematic diagram of a fluctuation detection circuit according to embodiment 3 of the present invention;
fig. 7 is a circuit schematic diagram of a second variation module according to embodiment 4 of the present invention;
fig. 8 is a schematic diagram of a fluctuation detection circuit provided in embodiment 4 of the present invention;
fig. 9 is a circuit schematic diagram of a first variation module according to embodiment 5 of the present invention;
fig. 10 is a circuit diagram of a first variation module according to embodiment 5 of the present invention;
fig. 11 is a schematic diagram of a fluctuation detection circuit according to embodiment 5 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
fig. 2 is a schematic diagram of a fluctuation detection circuit according to an embodiment of the present invention, where the fluctuation detection circuit includes a comparator U1, a first variation module 11, and a second variation module 12; wherein,
the input end of the first variation module 11 is connected to a signal for detecting fluctuation, the output end is connected to the first input end of the comparator U1, the first variation module 11 is configured to output a first output voltage to the comparator U1 if positive pulse fluctuation of the signal is detected, wherein the first output voltage is the sum of a first reference voltage and a positive pulse amplitude, and if no positive pulse fluctuation of the signal is detected, output a first output voltage with the value of the first reference voltage to the comparator U1;
the input end of the second variation module 12 is connected to a signal for detecting fluctuation, the output end is connected to the second input end of the comparator U1, the second variation module 12 is configured to output a second output voltage to the comparator U1 if it is detected that the signal has negative pulse fluctuation, wherein the second output voltage is a difference between a second reference voltage and a negative pulse amplitude, and if it is detected that the signal has no negative pulse fluctuation, output a second output voltage having a value of the second reference voltage to the comparator U1, wherein the second reference voltage is greater than the first reference voltage, and the first reference voltage or the second reference voltage is the same as the voltage when the signal has no fluctuation;
the first input end and the second input end of the comparator U1 are respectively connected with the output end of the first variation module 11 and the output end of the second variation module 12, and the comparator U1 outputs a comparison result according to a first output voltage input by the first input end and a second output voltage input by the second input end.
In the embodiment of the present invention, the first reference voltage and the second reference voltage are determined according to a voltage when a signal for performing fluctuation detection does not fluctuate and a maximum pulse amplitude allowed when the signal fluctuates in a normal pulse, and may be the same as the voltage when the signal does not fluctuate or the same as the voltage when the signal does not fluctuate, where a difference between the second reference voltage and the first reference voltage is equal to the maximum pulse amplitude allowed when the signal fluctuates in a normal pulse. For example: if the first reference voltage is 10V as the same as the voltage when the signal is not fluctuated, the maximum pulse amplitude allowed when the signal is normally fluctuated is 2V, namely the normal voltage range of the signal is 10 +/-2V, and the second reference voltage is 12V because the second reference voltage is greater than the first reference voltage; also because the second reference voltage is greater than the first reference voltage, if the second reference voltage is 10V, the first reference voltage is 8V.
Meanwhile, in the embodiment of the present invention, the polarities of the first input terminal and the second input terminal of the comparator U1 are different, and the comparator U1 indicates the signal fluctuation with different level signals according to the corresponding different polarities of the first input terminal and the second input terminal of the comparator U1. If the first input end of the comparator U1 is a positive phase input end and the second input end is an inverting input end, when the amplitude of the pulse fluctuation of the signal exceeds the maximum allowable pulse amplitude, the comparator U1 outputs a high level; if the first input terminal of the comparator U1 is an inverting input terminal and the second input terminal is a non-inverting input terminal, the comparator U1 outputs a low level when the amplitude of the pulse fluctuation of the signal exceeds the maximum allowable pulse amplitude.
Specifically, if the first input terminal of the comparator U1 is a positive phase input terminal and the second input terminal is a negative phase input terminal, when the pulse fluctuation does not occur in the signal, the first variation module 11 outputs a first output voltage having a value of the first reference voltage, the second variation module 12 outputs a second output voltage having a value of the second reference voltage, the second output voltage is greater than the first output voltage, and the comparator U1 outputs a low level; when a signal has a pulse fluctuation with a pulse amplitude smaller than the difference between the second reference voltage and the first reference voltage, if a positive pulse fluctuation occurs, the first output voltage output by the first change module 11 is the sum of the first reference voltage and the positive pulse amplitude, the second change module 12 outputs a second output voltage with a value of the second reference voltage, the second reference voltage is larger than the first reference voltage, the first reference voltage plus the positive pulse amplitude with a pulse amplitude smaller than the difference between the second reference voltage and the first reference voltage is still smaller than the second reference voltage, the comparator U1 outputs a low level, if a negative pulse fluctuation occurs, the first change module 11 outputs a first output voltage with a value of the first reference voltage, and the second output voltage output by the second change module 12 is the difference between the second reference voltage and the negative pulse amplitude, the second reference voltage is greater than the first reference voltage, the second reference voltage is still greater than the first reference voltage after subtracting the negative pulse amplitude of which the pulse amplitude is smaller than the difference value of the second reference voltage and the first reference voltage, and the comparator U1 outputs a low level.
When a signal has pulse fluctuation with a pulse amplitude larger than the difference value between the second reference voltage and the first reference voltage, if positive pulse fluctuation occurs, the first output voltage output by the first change module 11 is the sum of the first reference voltage and the positive pulse amplitude, the second output voltage output by the second change module 12 is the second output voltage of the second reference voltage, the second output voltage is smaller than the first output voltage, and the comparator U1 outputs a high level; if the negative pulse fluctuation occurs, the first variation module 11 outputs a first output voltage having a value of the first reference voltage, the second variation module 12 outputs a second output voltage having a difference between the second reference voltage and the magnitude of the negative pulse, the second output voltage is smaller than the first output voltage, and the comparator U1 outputs a high level.
For example: the first input end of the comparator U1 is a positive phase input end, the second input end is an inverting input end, the first reference voltage is equal to the voltage when the signal is not fluctuated and is 10V, the maximum pulse amplitude allowed when the signal is fluctuated normally is 2V, that is, the difference between the second reference voltage and the first reference voltage is 2V, it is determined that the second reference voltage is 12V, if the signal is fluctuated by a pulse with a pulse amplitude smaller than the difference between the second reference voltage and the first reference voltage, for example, the pulse amplitude is 1V, if the signal is fluctuated positively, the first output voltage output by the first change module 11 is 11V, the second output voltage output by the second change module 12 is 12V, the 12V is larger than 11V, the second output voltage is larger than the first output voltage, and the comparator U1 outputs a low level; if the pulse is negative pulse fluctuation, the first output voltage output by the first change module 11 is 10V, the second output voltage output by the second change module 12 is 11V, 11V is greater than 10V, the second output voltage is greater than the first output voltage, and the comparator U1 outputs a low level.
If the signal has a pulse fluctuation with a pulse amplitude larger than the maximum pulse amplitude allowed when the signal has a normal pulse fluctuation, for example, the pulse amplitude is 3V, if the signal has a positive pulse fluctuation, the first output voltage output by the first change module 11 is 13V, the second output voltage output by the second change module 12 is 12V, 13V is larger than 11V, the second output voltage is smaller than the first output voltage, the comparator U1 outputs a high level, if the signal has a negative pulse fluctuation, the first output voltage output by the first change module 11 is 10V, the second output voltage output by the second change module 12 is 9V, 10V is larger than 9V, the second output voltage is smaller than the first output voltage, and the comparator U1 outputs a high level.
In addition, if the first input terminal of the comparator U1 is an inverting input terminal and the second input terminal is a non-inverting input terminal, when the pulse fluctuation does not occur in the signal, the first variation module 11 outputs a first output voltage having a value of the first reference voltage, the second variation module 12 outputs a second output voltage having a value of the second reference voltage, the second output voltage is greater than the first output voltage, and the comparator U1 outputs a high level; when a signal has a pulse fluctuation with a pulse amplitude smaller than the difference between the second reference voltage and the first reference voltage, if a positive pulse fluctuation occurs, the first output voltage output by the first change module 11 is the sum of the first reference voltage and the positive pulse amplitude, the second output voltage output by the second change module 12 is the second output voltage of the second reference voltage, the second output voltage is greater than or equal to the first output voltage, the comparator U1 outputs a high level, if a negative pulse fluctuation occurs, the first output voltage output by the first change module 11 is the first output voltage of the first reference voltage, the second output voltage output by the second change module 12 is the difference between the second reference voltage and the negative pulse amplitude, the second output voltage is greater than the first output voltage, and the comparator U1 outputs a high level; when a pulse fluctuation of a signal having a pulse amplitude larger than a difference between the second reference voltage and the first reference voltage occurs, if a positive pulse fluctuation occurs, the first output voltage output by the first change module 11 is a sum of the first reference voltage and the positive pulse amplitude, the second output voltage output by the second change module 12 is a second output voltage of the second reference voltage, the second output voltage is smaller than the first output voltage, the comparator U1 outputs a low level, if a negative pulse fluctuation occurs, the first output voltage output by the first change module 11 is the first output voltage of the first reference voltage, the second output voltage output by the second change module 12 is a difference between the second reference voltage and the negative pulse amplitude, the second output voltage is smaller than the first output voltage, and the comparator U1 outputs a low level.
Therefore, in the embodiment of the present invention, it may be determined, according to the detection range of the signal fluctuation detection circuit and the connection relationship between the first change module and the second transform module and the positive input terminal and the negative input terminal of the comparator, that no fluctuation occurs in the signal or the fluctuation occurs in the allowable fluctuation range of the signal fluctuation detection circuit, and the output level of the comparator, when the signal subjected to the fluctuation detection is specifically detected, it may be determined whether the signal to be detected has a fluctuation exceeding the allowable fluctuation range of the fluctuation detection circuit according to whether the level actually output by the comparator is not fluctuated or whether the fluctuation occurs in the allowable fluctuation range of the signal fluctuation detection circuit.
In the embodiment of the invention, the first change module determines the first output voltage according to the set first reference voltage and the amplitude of the positive pulse of the signal generation, the second change module determines the second output voltage according to the set second reference voltage and the amplitude of the negative pulse of the signal generation, the comparator determines whether the signal generates pulse fluctuation exceeding a normal range or not by comparing the first output voltage with the second output voltage, and the signal fluctuation detection circuit can complete the detection of the signal fluctuation only through one comparator, thereby reducing the volume and energy consumption of the signal fluctuation detection circuit and the cost for manufacturing the signal fluctuation detection circuit, and improving the user experience.
Example 2:
on the basis of the foregoing embodiments, fig. 3 is a circuit schematic diagram of a first variation module 11 according to an embodiment of the present invention, where the first variation module 11 includes a first power source V1, a first resistor R1, a second resistor R2, a first diode D1, and a first capacitor C1; wherein,
the first power source V1 is connected in series with the first resistor R1 and the second resistor R2, one end of the second resistor R2 which is not connected with the first resistor R1 is grounded, the anode of the first diode D1 is connected with the first capacitor C1, the first capacitor C1 is not connected with one end of the first diode D1 which is connected with a signal for fluctuation detection, the cathode of the first diode D1 is connected with the series connection point of the first resistor and the second resistor and is connected with the first input end of the comparator U1, and when the signal does not fluctuate, the voltage at two ends of the second resistor R2 is the same as the first reference voltage.
In the embodiment of the present invention, the resistance of the first resistor R1, the resistance of the second resistor R2, and the output voltage of the first power source V1 are determined according to the first reference voltage, and when the first power source V1 is connected in series with the first resistor R1 and the second resistor R2, and the end of the second resistor R2 not connected to the first resistor R1 is grounded, the voltage across the second resistor R2 is equal to the first reference voltage, that is, it is satisfied that R2/(R1+ R2) × V1 is equal to the first reference voltage.
Specifically, when the signal does not fluctuate, the voltage of the side of the capacitor C1 connected to the first diode D1 is equal to the voltage across the second resistor R2, and is the same as the first reference voltage, the voltage of the side of the capacitor C1 connected to the first diode is equal to the voltage of the signal, the signal does not fluctuate, the capacitor C1 is not charged or discharged, and the first output voltage output to the comparator U1 is the voltage across the second resistor R2, that is, the first reference voltage; when the signal is subjected to positive pulse fluctuation, the first capacitor C1 is charged and discharged, the voltage on the side where the capacitor C1 is connected with the first diode D1 is started from the voltage at two ends of the second resistor R2 when the signal is not subjected to fluctuation, namely, the voltage on the positive electrode side of the first diode D1 is higher than the voltage on the negative electrode side of the first diode D1, the first diode D1 is conducted, and the first output voltage output to the comparator U1 is the sum of the first reference voltage and the positive pulse amplitude, and the voltage on the two ends of the second resistor R2 is the starting point, namely, the voltage and the positive pulse fluctuation have the same amplitude; when the signal is subjected to negative pulse fluctuation, the first capacitor C1 is charged and discharged, the voltage of the side, where the first capacitor C1 is connected with the first diode D1, of the second resistor R2 is from the voltage of the two ends of the first capacitor C1 when the signal is not subjected to fluctuation, namely from the first reference voltage, the negative pulse fluctuation with the same amplitude is generated simultaneously with the signal subjected to fluctuation detection, the voltage of the positive side of the first diode D1 is lower than the voltage of the negative side of the first diode D1, the first diode D1 is not conducted, and the first output voltage output to the comparator U1 is the voltage of the two ends of the second resistor R2, namely the first reference voltage.
Example 3:
on the basis of the above embodiments, in the implementation of the present invention, if the second reference voltage is the same as the voltage when the signal does not fluctuate, the circuit of the second variation module 12 is as shown in fig. 4, and the second variation module 12 includes a second power supply V2, a third resistor R3, a second diode D2; wherein,
the second power supply V2 is sequentially connected with the third resistor R3 and the anode of the second diode, the cathode of the second diode D2 is connected with a signal for detecting fluctuation, the serial connection point of the second diode D2 and the third resistor R3 is connected with the second input end of the comparator U1, wherein the output voltage of the second power supply V2 is the same as the second reference voltage.
In the embodiment of the present invention, the output voltage of the second power supply V2 is determined according to the second reference voltage, and is the same as the second reference voltage, specifically, when the signal does not fluctuate, the voltage on the positive electrode side of the second diode D2 is the output voltage of the second power supply V2, the voltage on the negative electrode side of the second diode D2 is the voltage when the signal does not fluctuate, and is the same as the output voltage of the second power supply V2, the second diode D2 is not conductive, and the second output voltage output to the comparator U1 is the second reference voltage; when the positive pulse fluctuation of the signal occurs, the voltage on the positive electrode side of the second diode D2 is lower than the voltage on the negative electrode side of the second diode D2, the second diode D2 is not conducted, and the second output voltage output to the comparator U1 is the second reference voltage; when the negative pulse fluctuation occurs to the signal, the voltage on the positive electrode side of the second diode D2 is higher than the voltage on the negative electrode side of the second diode D2, the second diode D2 is turned on, and the second output voltage output to the comparator is the current voltage of the signal, wherein the current voltage of the signal is the same as the difference between the second reference voltage and the negative pulse amplitude.
In order to facilitate the acquisition of the second output voltage of the second variation module 12 by the comparator U1 when the signal fluctuates negatively, the second variation module 12 further includes a second capacitor C2; wherein the second capacitor C2 is connected in parallel with the third resistor R3.
Fig. 5 is a circuit diagram of a second variation module 12 according to an embodiment of the present invention. Specifically, the second capacitor C2 is connected in parallel with the third resistor R3, when the negative pulse fluctuation of the signal occurs, the voltage on the negative electrode side of the second diode D2 is lower than the voltage on the positive electrode side of the second diode D2, the second diode D2 is turned on, the voltage on the side where the second capacitor C2 is connected with the positive electrode of the second diode D2 is lower than the voltage on the side where the second capacitor C2 is connected with the second power supply V2, so as to charge the second capacitor C2, when the negative pulse fluctuation of the signal ends, the second capacitor C2 and the third resistor R3 form a closed loop, the second capacitor C2 discharges, the influence of the negative pulse of the signal on the second change module is continued, and the acquisition time of the comparator U1 on the second output voltage of the second module when the negative pulse fluctuation of the signal occurs is prolonged.
Fig. 6 is a schematic diagram of a ripple detection circuit according to an embodiment of the present invention, when a signal does not ripple, the first capacitor C1 is not charged or discharged, the second diode D2 is not turned on, the first output voltage output by the first variation module 11 is a first reference voltage, the second output voltage output by the second variation module 12 is a second reference voltage, and the comparator U1 outputs a comparison result according to the first output voltage and the second output voltage; when a positive pulse fluctuation occurs to a signal, the first capacitor C1 is charged and discharged, the side of the first capacitor C1 connected with the first diode D1 takes a first reference voltage as a starting point, the positive pulse fluctuation with the same amplitude occurs simultaneously with the signal for fluctuation detection, the voltage on the positive side of the first diode D1 is higher than the voltage on the negative side of the first diode D1, the first diode D1 is conducted, the voltage on the positive side of the second diode D2 is lower than the voltage on the negative side of the second diode D2, the second diode D2 is not conducted, the first output voltage output by the first change module 11 to the comparator U1 is the sum of the first reference voltage and the positive pulse amplitude, the second output voltage output by the second change module 12 to the comparator U1 is a second reference voltage, and the comparator U1 outputs a comparison result according to the first output voltage and the second output voltage; when the signal generates negative pulse fluctuation, the first capacitor C1 is charged and discharged, the side of the first capacitor C1 connected with the first diode D1 takes the first reference voltage as a starting point, the negative pulse fluctuation with the same amplitude occurs at the same time with the signal for fluctuation detection, the voltage at the positive side of the first diode D1 is lower than the voltage at the negative side of the first diode D1, the first diode D1 is not conducted, the voltage at the positive side of the second diode D2 is higher than the voltage at the negative side of the second diode D2, the second diode D2 is conducted, the first output voltage output to the comparator U1 by the first change module 11 is a first reference voltage, the second output voltage output to the comparator U1 by the second change module 12 is the current voltage of the signal, the comparator U1 outputs a comparison result according to the first output voltage and the second output voltage, as the difference between the second reference voltage and the negative pulse amplitude.
Example 4:
fig. 7 is a circuit schematic diagram of a second variation module 12 according to an embodiment of the present invention, in which the second variation module 12 includes a third power source V3, a fourth resistor R4, a fifth resistor R5, a third diode D3, and a third capacitor C3; wherein,
the third power source V3 is connected in series with the fourth resistor R4 and the fifth resistor R5, the end of the fifth resistor R5 not connected with the fourth resistor R4 is grounded, the cathode of the third diode D3 is connected with the third capacitor C3, the end of the third capacitor C3 not connected with the third diode D3 is connected with a signal for detecting fluctuation, the anode of the third diode D3 is connected with the series connection point of the fourth resistor R4 and the fifth resistor R5 and is connected with the second input end of the comparator U1, and when no fluctuation occurs in the signal, the voltage at two ends of the fifth resistor R5 is the same as the second reference voltage.
In the embodiment of the present invention, the resistance of the fourth resistor R4, the resistance of the fifth resistor R5, and the output voltage of the third power supply V5 are determined according to the second reference voltage, and when the third power supply V3 is connected in series with the fourth resistor R4 and the fifth resistor R5, and the end of the fifth resistor R5 not connected to the fourth resistor R4 is grounded, the voltage across the fifth resistor is equal to the second reference voltage, that is, when the resistance of the fifth resistor R4, the resistance of the fifth resistor R5, and the output voltage of the third power supply V5 meet the requirement that the voltage across the fifth resistor R5(R4+ R5) V3 is equal to the.
Specifically, when the signal does not fluctuate, the voltage at the side where the capacitor C3 is connected to the third diode D3 is equal to the voltage across the fifth resistor R5, and is the same as the second reference voltage, the voltage at the side where the capacitor C3 is not connected to the third diode is equal to the voltage of the signal, the signal does not fluctuate, the capacitor C3 is not charged or discharged, and the second output voltage output to the comparator U1 is the voltage across the fifth resistor R5, that is, the second reference voltage; when the signal is subjected to positive pulse fluctuation, the third capacitor C3 is charged and discharged, the voltage on the side where the capacitor C3 is connected with the third diode D3 is subjected to positive pulse fluctuation with the same amplitude as the signal subjected to fluctuation detection, starting from the voltage across the fifth resistor R5 when the signal is not subjected to fluctuation, i.e., starting from a second reference voltage, the voltage on the positive electrode side of the third diode D3 is lower than the voltage on the negative electrode side of the third diode D3, the third diode D3 is not conducted, and the second reference voltage is output to the comparator U1; when the negative pulse ripple occurs in the signal, the third capacitor C3 is charged and discharged, the voltage on the side where the capacitor C3 is connected to the third diode D3 starts from the voltage across the fifth resistor R5 when the signal does not fluctuate, that is, the voltage on the positive electrode side of the third diode D3 is higher than the voltage on the negative electrode side of the third diode D3, the third diode D3 is turned on, and the second voltage output to the comparator U1 is the difference between the second reference voltage and the negative pulse amplitude, with the voltage on the side where the capacitor C3 is connected to the third diode D3, and the voltage on the side where the ripple detection is performed, that is, with the second reference voltage as the start point.
Fig. 8 is a schematic diagram of a ripple detection circuit according to an embodiment of the present invention, when a signal does not ripple, neither the first capacitor C1 nor the third capacitor C3 is charged or discharged, the first output voltage output by the first variation module 11 is a first reference voltage, the second output voltage output by the second variation module 12 is a second reference voltage, and the comparator U1 outputs a comparison result according to the first output voltage and the second output voltage; when a positive pulse fluctuation occurs to a signal, the side of the first capacitor C1 connected to the first diode D1 generates a positive pulse fluctuation with the same amplitude as the signal to be subjected to fluctuation detection at the same time with the first reference voltage as a starting point, the first diode D1 is turned on, the first output voltage output by the first change module 11 is the sum of the first reference voltage and the positive pulse amplitude, the side of the third capacitor C3 connected to the third diode D3 generates a positive pulse fluctuation with the same amplitude as the signal to be subjected to fluctuation detection at the same time with the second reference voltage as a starting point, the third diode D3 is turned off, the second output voltage output by the second change module 12 is a second reference voltage, and the comparator U1 outputs a comparison result according to the first output voltage and the second output voltage; when a signal is subjected to negative pulse fluctuation, the side, connected with the first diode D1, of the first capacitor C1 is subjected to negative pulse fluctuation with the same amplitude as the signal subjected to fluctuation detection at the same time by taking a first reference voltage as a starting point, the first diode D1 is not conducted, the first output voltage output by the first change module 11 is the first reference voltage, the side, connected with the third diode D3, of the third capacitor C3 is subjected to negative pulse fluctuation with the same amplitude as the signal subjected to fluctuation detection at the same time by taking a second reference voltage as a starting point, the third diode D3 is conducted, the second output voltage output by the second change module 12 is the difference between the second reference voltage and the negative pulse amplitude, and the comparator U1 outputs a comparison result according to the first output voltage and the second output voltage.
Example 5:
on the basis of the above embodiments, in the embodiment of the present invention, if the first reference voltage is the same as the voltage when the signal is fluctuating, the first variation module 11 is as shown in fig. 9, and the first variation module 11 includes a fourth power source V4, a sixth resistor R6, and a fourth diode D4; wherein,
the fourth power supply V4 is sequentially connected with the sixth resistor R6 and the cathode of a fourth diode, the anode of the fourth diode is connected with a signal for performing fluctuation detection, the serial connection point of the fourth diode D4 and the sixth resistor R6 is connected with the first input end of the comparator U1, and the output voltage of the fourth power supply V4 is the same as the first reference voltage.
In the embodiment of the present invention, the output voltage of the fourth power supply V4 is determined according to the first reference voltage, and is the same as the first reference voltage, specifically, when the signal does not fluctuate, the voltage on the negative electrode side of the fourth diode D4 is the output voltage of the second power supply V2, the voltage on the positive electrode side of the fourth diode D4 is the voltage when the signal does not fluctuate, and is the same as the output voltage of the second power supply V2, the fourth diode D4 is not conductive, and the first output voltage output to the comparator U1 is the first reference voltage; when the positive pulse fluctuation of the signal occurs, the voltage on the negative electrode side of the fourth diode D4 is lower than the voltage on the positive electrode side of the fourth diode D4, the fourth diode D4 is turned on, and the voltage output to the comparator is the current voltage of the signal, wherein the current voltage of the signal is the same as the sum of the first reference voltage and the positive pulse amplitude; when the negative pulse fluctuation occurs in the signal, the voltage on the negative side of the fourth diode D4 is higher than the voltage on the positive side of the fourth diode D4, and the difference between the voltage on the negative side of the fourth diode D4 and the voltage on the positive side of the fourth diode D4 is equal to the negative pulse amplitude, the fourth diode D4 is non-conductive, and the first output voltage output to the comparator U1 is the first reference voltage.
In order to facilitate the acquisition of the first output voltage of the first variation module 11 by the comparator U1 when the signal fluctuates in positive pulse, the first variation module 11 further includes a fourth capacitor C4; wherein the fourth capacitor C4 is connected in parallel with the sixth resistor R6.
Fig. 10 is a circuit diagram of a first variation module 11 according to an embodiment of the present invention. Specifically, the fourth capacitor C4 is connected in parallel with the sixth resistor R6, when the positive pulse fluctuation of the signal occurs, the voltage on the negative electrode side of the fourth diode D4 is lower than the voltage on the positive electrode side of the fourth diode D4, the fourth diode D4 is turned on, the voltage on the side where the fourth capacitor C4 is connected with the fourth diode D4 is higher than the voltage on the side where the fourth capacitor C4 is connected with the fourth power supply V4, the fourth capacitor C4 is charged, when the positive pulse fluctuation of the signal ends, the fourth capacitor C4 and the fourth resistor R4 form a closed loop, the fourth capacitor C4 is discharged, the influence of the positive pulse fluctuation of the signal on the first change module is continued, and the acquisition time of the comparator U1 on the first output voltage of the first module when the positive pulse fluctuation of the signal occurs is prolonged.
Fig. 11 is a schematic diagram of a ripple detection circuit according to an embodiment of the present invention, when a signal does not ripple, the fourth diode D4 is not turned on, the third capacitor C3 is not charged or discharged, the first output voltage output by the first variation module 11 is a first reference voltage, the second output voltage output by the second variation module 12 is a second reference voltage, and the comparator U1 outputs a comparison result according to the first output voltage and the second output voltage; when the positive pulse fluctuation of the signal occurs, the voltage on the positive electrode side of the fourth diode D4 is higher than the voltage on the negative electrode side of the fourth diode D4, the fourth diode D4 is conducted, the side, connected with the third diode D3, of the third capacitor C3 and the third diode D3 simultaneously generates positive pulse fluctuation with the same amplitude as the signal for fluctuation detection, the third diode D3 is not conducted, the first output voltage output by the first change module 11 is the sum of the first reference voltage and the positive pulse amplitude, the second output voltage output by the second change module 12 is the second reference voltage, and the comparator U1 outputs a comparison result according to the first output voltage and the second output voltage; when the negative pulse fluctuation occurs to the signal, the voltage on the positive side of the fourth diode D4 is lower than the voltage on the negative side of the fourth diode D4, the fourth diode D4 is not conducted, the side where the third capacitor C3 is connected to the third diode D3 and the signal for detecting the fluctuation simultaneously generate the negative pulse fluctuation with the same amplitude with the second reference voltage as the starting point, the third diode D3 is conducted, the first output voltage output by the first variation module 11 is the first reference voltage, the second output voltage output by the second variation module 12 is the difference between the second reference voltage and the negative pulse amplitude, and the comparator U1 outputs the comparison result according to the first output voltage and the second output voltage.
The invention discloses a signal fluctuation detection circuit, which comprises a comparator, a first change module and a second change module, wherein the comparator is used for comparing the first change module with the second change module; the input end of the first change module is connected with a signal for fluctuation detection, the output end of the first change module is connected with the first input end of the comparator, the first change module is used for outputting a first output voltage to the comparator if positive pulse fluctuation of the signal is detected, wherein the first output voltage is the sum of a first reference voltage and positive pulse amplitude, and if positive pulse fluctuation of the signal is not detected, the first output voltage with the value of the first reference voltage is output to the comparator; the input end of the second change module is connected with a signal for fluctuation detection, the output end of the second change module is connected with the second input end of the comparator, the second change module is used for outputting a second output voltage to the comparator if negative pulse fluctuation of the signal is detected, wherein the second output voltage is the difference between a second reference voltage and the amplitude of the negative pulse, and if no negative pulse fluctuation of the signal is detected, the second output voltage with the value of the second reference voltage is output to the comparator, wherein the second reference voltage is greater than the first reference voltage, and the first reference voltage or the second reference voltage is the same as the voltage when no fluctuation of the signal occurs; and the comparator outputs a comparison result according to a first output voltage input by the first input end and a second output voltage input by the second input end. In the embodiment of the invention, the first change module determines the first output voltage according to the set first reference voltage and the amplitude of the positive pulse of the signal generation, the second change module determines the second output voltage according to the set second reference voltage and the amplitude of the negative pulse of the signal generation, the comparator determines whether the signal generates pulse fluctuation exceeding a normal range or not by comparing the first output voltage with the second output voltage, and the signal fluctuation detection circuit can complete the detection of the signal fluctuation only through one comparator, thereby reducing the volume and energy consumption of the signal fluctuation detection circuit and the cost for manufacturing the signal fluctuation detection circuit, and improving the user experience.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A signal fluctuation detection circuit is characterized by comprising a comparator, a first change module and a second change module; wherein,
the input end of the first change module is connected with a signal for fluctuation detection, the output end of the first change module is connected with the first input end of the comparator, the first change module is used for outputting a first output voltage to the comparator if positive pulse fluctuation of the signal is detected, wherein the first output voltage is the sum of a first reference voltage and positive pulse amplitude, and if positive pulse fluctuation of the signal is not detected, the first output voltage with the value of the first reference voltage is output to the comparator;
the input end of the second change module is connected with a signal for fluctuation detection, the output end of the second change module is connected with the second input end of the comparator, the second change module is used for outputting a second output voltage to the comparator if negative pulse fluctuation of the signal is detected, wherein the second output voltage is the difference between a second reference voltage and the amplitude of the negative pulse, and if no negative pulse fluctuation of the signal is detected, the second output voltage with the value of the second reference voltage is output to the comparator, wherein the second reference voltage is greater than the first reference voltage, and the first reference voltage or the second reference voltage is the same as the voltage when no fluctuation of the signal occurs;
and the comparator outputs a comparison result according to a first output voltage input by the first input end and a second output voltage input by the second input end.
2. The signal fluctuation detection circuit according to claim 1, wherein the first variation block comprises a first power supply, a first resistor, a second resistor, a first diode, a first capacitor; wherein,
the first power supply is connected with the first resistor and the second resistor in series, one end, which is not connected with the first resistor, of the second resistor is grounded, the anode of the first diode is connected with the first capacitor, one end, which is not connected with the first diode, of the first capacitor is connected with a signal for fluctuation detection, the cathode of the first diode is connected with a serial connection point of the first resistor and the second resistor and is connected with the first input end of the comparator, and when the signal does not fluctuate, the voltage at two ends of the second resistor is the same as the first reference voltage.
3. The signal fluctuation detection circuit according to claim 2, wherein the second variation module includes a second power supply, a third resistor, a second diode, if the second reference voltage is the same as a voltage at which the signal is not fluctuated; wherein,
the second power supply is sequentially connected with the third resistor and the anode of a second diode, the cathode of the second diode is connected with a signal for fluctuation detection, the serial connection point of the second diode and the third resistor is connected with the second input end of the comparator, and the output voltage of the second power supply is the same as the second reference voltage.
4. The signal fluctuation detection circuit according to claim 3, wherein the second variation module further comprises a second capacitance; wherein the second capacitor is connected in parallel with the third resistor.
5. The signal fluctuation detection circuit according to claim 1, wherein the second variation module comprises a third power supply, a fourth resistor, a fifth resistor, a third diode, a third capacitor; wherein,
the third power supply is connected with the fourth resistor and the fifth resistor in series, one end of the fifth resistor, which is not connected with the fourth resistor, is grounded, the negative electrode of the third diode is connected with the third capacitor, one end of the third capacitor, which is not connected with the third diode, is connected with a signal for fluctuation detection, the positive electrode of the third diode is connected with a serial connection point of the fourth resistor and the fifth resistor and is connected with the second input end of the comparator, and when the signal does not fluctuate, the voltage at two ends of the fifth resistor is the same as the second reference voltage.
6. The signal fluctuation detection circuit according to claim 5, wherein the first variation block comprises a first power supply, a first resistor, a second resistor, a first diode, a first capacitor; wherein,
the first power supply is connected with the first resistor and the second resistor in series, one end, which is not connected with the first resistor, of the second resistor is grounded, the anode of the first diode is connected with the first capacitor, one end, which is not connected with the first diode, of the first capacitor is connected with a signal for fluctuation detection, the cathode of the first diode is connected with a serial connection point of the first resistor and the second resistor and is connected with the first input end of the comparator, and when the signal does not fluctuate, the voltage at two ends of the second resistor is the same as the first reference voltage.
7. The signal fluctuation detection circuit according to claim 5, wherein the first variation block includes a fourth power supply, a sixth resistor, a fourth diode, if the first reference voltage is the same as a voltage at which the signal does not fluctuate; wherein,
the fourth power supply is sequentially connected with the sixth resistor and the cathode of a fourth diode, the anode of the fourth diode is connected with a signal for fluctuation detection, the serial connection point of the fourth diode and the sixth resistor is connected with the first input end of the comparator, and the output voltage of the fourth power supply is the same as the first reference voltage.
8. The signal fluctuation detection circuit according to claim 7, wherein the first variation module further comprises a fourth capacitance; wherein the fourth capacitor is connected in parallel with the sixth resistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710473957.1A CN109100564B (en) | 2017-06-21 | 2017-06-21 | Signal fluctuation detection circuit |
| EP17914749.1A EP3635948A4 (en) | 2017-06-21 | 2017-12-29 | System and method for mixed transmission of signals and power supply through a single cable |
| PCT/CN2017/119762 WO2018233268A1 (en) | 2017-06-21 | 2017-12-29 | System and method for mixed transmission of signals and power supply through a single cable |
| US16/708,487 US11196408B2 (en) | 2017-06-21 | 2019-12-10 | System and method for mixed transmission of signals and power supply through a single cable |
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| CN201710473957.1A CN109100564B (en) | 2017-06-21 | 2017-06-21 | Signal fluctuation detection circuit |
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| CN101566645B (en) * | 2008-04-21 | 2011-07-27 | 北京同方微电子有限公司 | Detection circuit for power supply voltage pulse interference |
| CN101615588A (en) * | 2009-07-31 | 2009-12-30 | 上海集成电路研发中心有限公司 | A kind of integrated circuit resistance and capacitance technological parameter fluctuation detector and using method |
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| CN105450211A (en) * | 2014-06-05 | 2016-03-30 | 无锡华润矽科微电子有限公司 | Signal detection circuit |
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