Signal amplitude detection circuit

Abstract

The embodiment of the utility model relates to the field of signal detection, and discloses a signal amplitude detection circuit. The signal amplitude detection circuit comprises a signal conversion module used for converting a signal to be detected into a first signal and a second signal, the first signal and the second signal have the same level value, and the frequency of the first signal and the frequency of the second signal are the same as the frequency of the signal to be detected; the first signal smoothing processing module carries out smoothing processing on the first signal; the second signal smoothing processing module carries out smoothing processing on the second signal; wherein the smoothing processing degrees of the first signal smoothing processing module and the second signal smoothing processing module on signals are different; and the first voltage comparator is used for comparing the smoothed first electric signal with the smoothed second electric signal and outputting a comparison result. And the to-be-detected signal with interval pulse change is converted into a stable signal output result.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to signal detection field, especially a kind of signal amplitude detection circuit. BACKGROUND

[0002] In order to determine the stability of the device, the signal characteristics in the device circuit can be used to determine the stability of the device. For the signal in the device circuit, a detection circuit can be designed to connect the detection circuit with the external interface of the device, and to detect whether there is a specific voltage signal in the device circuit using the detection circuit.

[0003] The inventor found that the current detection circuit at least has the following problems: the existing detection circuit can only be used to detect the signal with constant voltage, if the signal to be detected is a signal with interval pulse change, the accurate detection result cannot be obtained, the detection result will be affected by the debounce time, if the interval of pulse change is less than the debounce time, the software based on the debounce logic will filter out the signal to be detected, so that the system cannot recognize the signal with interval pulse change to be detected, so that the detection result is not accurate enough. If the software processing logic is changed to distinguish the jitter signal and the signal to be detected, more timer resources need to be called, which increases the flow consumption. UTILITY MODEL CONTENT

[0004] The embodiment of the utility model aims to provide a signal amplitude detection circuit, by modifying the hardware circuit, the signal to be detected with interval pulse change is converted into a stable signal output result using the modified hardware circuit, and then the software logic is convenient for judging the signal, and the accuracy of circuit detection is improved without additional flow consumption.

[0005] To solve the above technical problems, the embodiment of the utility model provides a kind of signal amplitude detection circuit, comprising: signal conversion module, first signal smoothing processing module, second signal smoothing processing module and first voltage comparator;The signal conversion module is used to convert the signal to be detected into first signal and second signal, the level value of the first signal and the second signal is same, and the frequency of the first signal and the second signal is same with the frequency of the signal to be detected;The first signal smoothing processing module is connected with the output terminal of the signal conversion module, and the first signal is smoothed;The second signal smoothing processing module is connected with the other output terminal of the signal conversion module, and the second signal is smoothed;Wherein, the first signal smoothing processing module and the second signal smoothing processing module are different in the degree of signal smoothing processing;The output terminal of the first signal smoothing processing module and the output terminal of the second signal smoothing processing module are connected respectively with the two input terminals of the first voltage comparator, and the first voltage comparator is used to compare the first electric signal after smoothing processing and the second electric signal after smoothing processing, and output the result of comparison.

[0006] The embodiment of the utility model relative to relevant technique, utilize signal conversion module and convert the signal to be detected into the first signal and the second signal of same level value, and the frequency of the first signal and the second signal is same with the frequency of the signal to be detected, the first signal and the second signal are isolated as two paths respectively by first signal smoothing processing module and second signal smoothing processing module and are smoothed to different degrees, and finally by first voltage comparator the first electric signal after smoothing processing and the second electric signal after smoothing processing are compared, and output the result of comparison.When the signal to be detected with interval pulse changes is input to the above detection circuit, signal conversion module converts the signal to be detected into two potential same square wave pulse signals with same frequency, when two same square wave pulse signals are smoothed to different degrees respectively, first voltage comparator receives two signals with stable error, and output stable signal, to realize that the signal to be detected with interval pulse changes is converted into smooth signal output result by hardware circuit, and then the judgment of signal by software logic is facilitated, and the accuracy of circuit detection is improved while not increasing flow consumption additionally.

[0007] In addition, the signal conversion module comprises: a first voltage follower and a second voltage follower;The first voltage follower is used to convert the signal to be detected into a first signal;The second voltage follower is used to convert the signal to be detected into a second signal.

[0008] In addition, the first voltage follower and the second voltage follower are connected to the same power supply and the same ground terminal.

[0009] In addition, the amplitude detection circuit of the signal further comprises a second voltage comparator; an output end of the second voltage comparator is connected with the signal conversion module; two input ends of the second voltage comparator are connected with the signal to be detected and a reference level signal respectively, and are used for distinguishing whether the signal to be detected is a high level signal or a low level signal.

[0010] In addition, the amplitude detection circuit of the signal further comprises a diode; the diode is connected with the output end of the first voltage comparator and the output end of the second voltage comparator respectively, and is used for conducting the current from the output end of the first voltage comparator to the output end of the second voltage comparator.

[0011] In addition, the amplitude detection circuit of the signal further comprises a voltage division module; the voltage division module is connected with the input end of the second voltage comparator, and the signal to be detected is transmitted to the input end of the second voltage comparator after passing through the voltage division module.

[0012] In addition, the first signal smoothing processing module is a first RC filter circuit, and the second signal smoothing processing module is a second RC filter circuit.

[0013] In addition, the first RC filter circuit is composed of a first resistor and a first capacitor, the second RC filter circuit is composed of a second resistor and a second capacitor, the resistance value of the first resistor is the same as that of the second resistor, and the capacitance value of the first capacitor is different from that of the second capacitor.

[0014] In addition, the capacitance value of one of the first capacitor and the second capacitor is 1UF, and the capacitance value of the other capacitor is 10UF.

[0015] In addition, the amplitude detection circuit of the signal further comprises a denoising module; the denoising module is connected with the input end of the signal conversion module, is used for denoising the signal to be detected, and transmits the denoised signal to be detected to the input end of the signal conversion module. BRIEF DESCRIPTION OF DRAWINGS

[0016] One or more embodiments are illustrated by way of example in the drawings that are for illustrative purposes only, and not for the purposes of limitation of the embodiments, elements having the same reference numbers in the drawings represent like elements, and the drawings are not to scale unless otherwise specifically noted.

[0017] Figure 1 is a circuit connection schematic diagram of an amplitude detection circuit of a signal according to a first embodiment of the utility model;

[0018] Figure 2 is a circuit connection schematic diagram of an amplitude detection circuit of a signal according to a second embodiment of the utility model;

[0019] Figure 3 is a circuit connection schematic diagram of the amplitude detection circuit of a signal according to the third embodiment of the present application;

[0020] Figure 4 is a circuit connection schematic diagram of the amplitude detection circuit of a signal according to the fourth embodiment of the present application;

[0021] Figure 5 is a circuit connection schematic diagram of the amplitude detection circuit of a signal according to the fifth embodiment of the present application;

[0022] Figure 6 is a circuit connection schematic diagram of the amplitude detection circuit of a signal according to the sixth embodiment of the present application;

[0023] Figure 7 is a structural schematic diagram of the signal conversion module in the amplitude detection circuit of a signal according to the sixth embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that in the embodiments of the present application, many technical details are proposed in order to make the readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed by the present application can be implemented.

[0025] The division of the following embodiments is for the convenience of description, and should not constitute any limitation on the specific implementation of the present application, and each embodiment can be combined and quoted with each other on the premise of no contradiction.

[0026] The first embodiment of the present application relates to an amplitude detection circuit of a signal, such as Figure 1As shown, it comprises: a signal conversion module 1, a first signal smoothing processing module 2, a second signal smoothing processing module 3 and a first voltage comparator 4; the signal conversion module 1 is used for converting a to-be-detected signal into a first signal and a second signal, the first signal and the second signal have the same level value, and the first signal and the second signal have the same frequency as that of the to-be-detected signal; the first signal smoothing processing module 2 is connected with one of the output ends of the signal conversion module 1 and performs smoothing processing on the first signal; the second signal smoothing processing module 3 is connected with the other output end of the signal conversion module 1 and performs smoothing processing on the second signal; wherein the first signal smoothing processing module 2 and the second signal smoothing processing module 3 have different smoothing processing degrees on the signals; the two input ends of the first voltage comparator 4 are connected with the output end of the first signal smoothing processing module 2 and the output end of the second signal smoothing processing module 3 respectively, and the first voltage comparator 4 is used for comparing the first signal after smoothing processing and the second signal after smoothing processing and outputting the comparison result.

[0027] The signal conversion module comprises: a first voltage follower and a second voltage follower; the first voltage follower is used for converting the to-be-detected signal into the first signal; and the second voltage follower is used for converting the to-be-detected signal into the second signal.

[0028] The first signal smoothing processing module is a first RC filter circuit, and the second signal smoothing processing module is a second RC filter circuit. The first RC filter circuit is composed of a first resistor and a first capacitor, the second RC filter circuit is composed of a second resistor and a second capacitor, the resistance value of the first resistor is the same as that of the second resistor, and the capacitance values of the first capacitor and the second capacitor are different, so as to realize different degrees of smoothing processing on the signals.

[0029] Compared with the related art, the to-be-detected signal is converted into the first signal and the second signal with the same level value and the same frequency as that of the to-be-detected signal by the signal conversion module, the first signal and the second signal are isolated into two paths and are subjected to different degrees of smoothing processing by the first signal smoothing processing module and the second signal smoothing processing module respectively, and finally the first voltage comparator compares the first signal after smoothing processing and the second signal after smoothing processing and outputs the comparison result. When the to-be-detected signal with interval pulse change is input into the above detection circuit, the signal conversion module converts the to-be-detected signal into two square wave pulse signals with the same potential and the same frequency, the first voltage comparator receives two signals with stable errors after the two square wave pulse signals are subjected to different degrees of smoothing processing, and outputs a stable signal, so as to realize the conversion of the to-be-detected signal with interval pulse change into a smooth signal output result by using the hardware circuit, and then facilitate the judgment of the signal by the software logic, and improve the accuracy of the circuit detection without additional flow consumption.

[0030] The second embodiment of this utility model relates to a signal amplitude detection circuit, such as... Figure 2 As shown, based on the detection circuit of the first embodiment, it further includes: a second voltage comparator 5; the output terminal of the second voltage comparator 5 is connected to the signal conversion module 1, and the two input terminals of the second voltage comparator 5 are respectively connected to the signal to be detected and the reference level signal, used to distinguish whether the signal to be detected is a high-level signal or a low-level signal. If the level of the signal to be detected is higher than the reference level signal, the signal to be detected is a high-level signal, and the second voltage comparator 5 outputs a low level; if the level of the signal to be detected is lower than the reference level signal, the signal to be detected is a low-level signal, and the second voltage comparator 5 outputs a high level. After receiving the level signal output by the second voltage comparator 5, the signal conversion module 1 outputs a first signal and a second signal of the same level. If the second voltage comparator 5 outputs a stable low level, the signal conversion module 1 outputs a first signal and a second signal of the same low level based on the signal. The voltages of the first signal and the second signal at the input terminal of the first voltage comparator 4 are the same, and the first voltage comparator 4 remains in a floating state. If the second voltage comparator 5 outputs a stable high level, the signal conversion module 1 outputs a first signal and a second signal with the same high level based on this signal. The voltages of the first signal and the second signal at the input of the first voltage comparator 4 are the same, and the first voltage comparator 4 remains in a floating state. If the signal to be detected is a square wave with interval pulse changes, the second voltage comparator 5 outputs a square wave pulse signal with the same frequency as the signal to be detected. The signal conversion module 1 outputs two identical square wave pulse signals (the first signal and the second signal) based on this signal. After the two identical square wave pulse signals are smoothed to different degrees, the first voltage comparator receives two signals with stable errors and outputs a stable signal, thereby realizing the conversion of the signal to be detected with interval pulse changes into a stable signal output using hardware circuitry.

[0031] Compared with related technologies, this embodiment of the utility model uses a second voltage comparator to distinguish whether the signal to be detected is a high-level signal or a low-level signal, thereby realizing the detection of the amplitude of the signal to be detected.

[0032] The third embodiment of this utility model relates to a signal amplitude detection circuit, such as... Figure 3As shown, on the basis of the detection circuit of the second embodiment, further comprising: a diode; the diode is connected with the output end of the first voltage comparator 4 and the output end of the second voltage comparator 5 respectively, and the diode is used for conducting the current from the output end of the first voltage comparator 4 to the output end of the second voltage comparator 5. While detecting the to-be-detected signal with interval pulse change, the to-be-detected signal with stable and continuous amplitude can also be detected. If the to-be-detected signal is a stable and continuous signal with amplitude higher than the reference level signal, the second voltage comparator 5 outputs a stable low level, the signal conversion module 1 outputs the first signal and the second signal with the same low level based on the signal, the voltage of the first signal and the second signal at the input end of the first voltage comparator 4 is the same, the first voltage comparator 4 is maintained in a suspended state, at this time, the output result of the first voltage comparator 4 detected is pulled low by the low level output by the second voltage comparator 5, therefore, the low level signal is detected. If the to-be-detected signal is not detected or the to-be-detected signal is a stable and continuous signal with amplitude lower than the reference level signal, the second voltage comparator 5 outputs a stable high level, the signal conversion module 1 outputs the first signal and the second signal with the same high level based on the signal, the voltage of the first signal and the second signal at the input end of the first voltage comparator 4 is the same, the first voltage comparator 4 is maintained in a suspended state, at this time, the high level is detected. If the to-be-detected signal is a square wave with interval pulse change, based on the description in the second embodiment, the first voltage comparator 4 receives two signals with stable error, and outputs a stable signal, the first voltage comparator 4 outputs a low level, at this time, the detection result is a low level IND signal. According to the analysis of the detection results of the above different to-be-detected signals, when the detection result is a high level, the to-be-detected signal is not detected, and when the detection result is a low level, it is determined that the to-be-detected signal has been detected.

[0033] Compared with the related art, the embodiment of the utility model utilizes the diode to conduct the current from the output end of the first voltage comparator to the output end of the second voltage comparator, while detecting the to-be-detected signal with interval pulse change, the to-be-detected signal with stable and continuous amplitude can also be detected, and the signal type detection range of the detection circuit is increased.

[0034] The fourth embodiment of the utility model relates to a signal amplitude detection circuit, on the basis of the detection circuit of the first embodiment to the third embodiment, further comprising: a voltage division module is used for voltage division and current limiting to the to-be-detected signal, to ensure the safety of the detection circuit. Figure 4 The application of the voltage division module is introduced as shown, the voltage division module 6 is connected with the input end of the second voltage comparator 5, and the to-be-detected signal is transmitted to the input end of the second voltage comparator 5 after passing through the voltage division module 6. In addition, the to-be-detected signal can also be directly input to the signal conversion module through the voltage division module.

[0035] The fifth embodiment of the utility model relates to a signal amplitude detection circuit, and on the basis of the detection circuits of the first to fourth embodiments, further comprises: a denoising module for denoising the signal to be detected, filtering high-frequency noise and interference in the signal to be detected. Figure 5 The application of the voltage division module is introduced below, the denoising module 7 is connected with the input end of the signal conversion module 1, is used for denoising the signal to be detected, and transmits the denoised signal to be detected to the input end of the signal conversion module 1.

[0036] The sixth embodiment of the utility model relates to a signal amplitude detection circuit, such as Figure 6As shown, the to-be-detected signal DET is subjected to voltage division and current limitation by a voltage division module composed of capacitors C108 and C112, resistors R110, R106 and R102, and diode D101, to prevent the voltage of the to-be-detected signal from being too high to damage downstream components. The voltage-divided to-be-detected signal enters the negative input terminal of the second voltage comparator U101. The positive input terminal of the second voltage comparator is connected to a reference level signal, which is obtained by filtering the noise from the power supply VDD by a filter circuit (R112, R107 and C106). In addition, the ground terminal of the second voltage comparator is connected to capacitor C111 and resistor R101 to filter out noise and interference signals and ensure the stability of the circuit. The signal output by the second voltage comparator enters a signal conversion module composed of a first voltage follower U102-A and a second voltage follower U102-B. The signal output by the second voltage comparator is filtered by resistors R111 and R109 and capacitor C102 and then enters the positive input terminal IN1+ of the first voltage follower U102-A. The signal output by the second voltage comparator is also filtered by resistors R103 and R108 and capacitor C101 and then enters the positive input terminal IN2+ of the second voltage follower U102-B. The resistance of resistor R111 is the same as that of resistor R103, the resistance of resistor R109 is the same as that of resistor R108, and the capacitance of capacitor C102 is the same as that of capacitor C101. The signals output by the first voltage follower U102-A and the second voltage follower U102-B pass through diodes D102 and D104, respectively, to limit the current direction from the output terminals of the respective voltage followers to the downstream first voltage comparator. The signal passing through diode D102 enters a first signal smoothing processing module (a first RC filter circuit composed of R114, C107 and R104), and the signal passing through diode D104 enters a second signal smoothing processing module (a second RC filter circuit composed of R115, C104 and R105). The resistance of R114 is the same as that of R115, the resistance of R104 is the same as that of R105, and the capacitance of C104 is significantly different from that of C107, to ensure that the first signal passing through diode D102 and the second signal passing through diode D104 are smoothed to different degrees. For example, the capacitance of C104 is set to 1 UF, and the capacitance of C107 is set to 10 UF. The output terminal of the first voltage comparator is provided with a detection result output IND, and the output terminal of the first voltage comparator is provided with diode D103 in the direction of the output terminal of the second voltage comparator. One end of diode D103 is connected between the output terminal of the first voltage comparator and IND.

[0037] Regarding the design of the first voltage follower U102-A and the second voltage follower U102-B in the signal conversion module, as Figure 7As shown, the signal conversion module is composed of two same amplifiers A and B, the amplifier A includes an output terminal OutA, two input terminals -InA and +InA, and a power supply terminal V+ and a ground terminal V-; the amplifier B includes an output terminal OutB, two input terminals -InB and +InB, and a power supply terminal V+ and a ground terminal V-; the amplifier A and the amplifier B use the same power supply terminal V+ and the ground terminal V- to simplify the circuit wiring.

[0038] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for implementing the present application, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A signal amplitude detection circuit, characterized by comprising: The application relates to a signal conversion module, a first signal smoothing processing module, a second signal smoothing processing module and a first voltage comparator. The signal conversion module is used for converting a to-be-detected signal into a first signal and a second signal, the first signal and the second signal have the same level value, and the first signal and the second signal have the same frequency as the to-be-detected signal. The first signal smoothing processing module is connected with one output end of the signal conversion module and is used for smoothing the first signal. The second signal smoothing processing module is connected with the other output end of the signal conversion module and is used for smoothing the second signal. The first signal smoothing processing module and the second signal smoothing processing module have different smoothing degrees. The first voltage comparator is connected with the output end of the first signal smoothing processing module and the output end of the second signal smoothing processing module, is used for comparing the first signal and the second signal, and outputs a comparison result. The signal conversion module comprises a first voltage follower and a second voltage follower.

2. The amplitude detection circuit of claim 1, wherein The first voltage follower is used for converting the to-be-detected signal into the first signal. The second voltage follower is used for converting the to-be-detected signal into the second signal. The first voltage follower and the second voltage follower are connected with the same power supply and the same ground end.

3. The amplitude detection circuit of claim 2, wherein The application further comprises a second voltage comparator.

4. The signal amplitude detection circuit according to claim 1, wherein The output end of the second voltage comparator is connected with the signal conversion module, two input ends of the second voltage comparator are connected with the to-be-detected signal and a reference level signal respectively, and the second voltage comparator is used for distinguishing whether the to-be-detected signal is a high-level signal or a low-level signal. The application further comprises:

5. The amplitude detection circuit of claim 4, wherein A diode. The diode is connected with the output end of the first voltage comparator and the output end of the second voltage comparator respectively, and is used for conducting the current flowing from the output end of the first voltage comparator to the output end of the second voltage comparator. The application further comprises:

6. The amplitude detection circuit of claim 4, wherein A voltage dividing module. The voltage dividing module is connected with the input end of the second voltage comparator, and the to-be-detected signal is transmitted to the input end of the second voltage comparator after passing through the voltage dividing module. The first signal smoothing processing module is a first RC filter circuit, and the second signal smoothing processing module is a second RC filter circuit.

7. The signal amplitude detection circuit according to claim 1, wherein The first RC filter circuit is composed of a first resistor and a first capacitor, the second RC filter circuit is composed of a second resistor and a second capacitor, the resistance value of the first resistor is the same as that of the second resistor, and the capacitance value of the first capacitor is different from that of the second capacitor.

8. The signal amplitude detection circuit according to claim 7, wherein The capacitance value of one capacitor is 1UF, and the capacitance value of the other capacitor is 10UF.

9. The signal amplitude detection circuit according to claim 8, characterized in that The application further comprises:

10. The signal amplitude detection circuit according to claim 1, characterized by A denoising module. The denoising module is connected with the input end of the signal conversion module, is used for denoising the to-be-detected signal, and transmits the denoised to-be-detected signal to the input end of the signal conversion module. ​

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