Signal enhancement device based on speed measurement system

Abstract

The embodiment of the utility model discloses a signal enhancement device based on a speed measurement system. The signal enhancement device is arranged between a signal output end of a speed sensor and a signal receiving end of a receiver. The signal enhancement device comprises a voltage clamping unit and an analog-to-digital conversion unit. The voltage clamping unit is electrically connected with the signal output end and is used for amplifying and clamping an analog signal output by the signal output end to generate a first analog signal. The analog-to-digital conversion unit is electrically connected with the voltage clamping unit and the signal receiving end, and is used for converting the first analog signal into a digital pulse signal and outputting the digital pulse signal to the signal receiving end. Thus, on the premise that the structure and the installation position of the speed sensor are not changed, the analog signal output by the speed sensor is amplified and converted into the digital pulse signal through the signal enhancement device, the anti-interference capacity of the digital pulse signal is high, and the effective transmission distance of the converted signal is greatly increased; and long-distance transportation of speed measurement signals is realized.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of rotational speed measurement, and particularly to a signal enhancement device based on a speed measurement system. Background Art

[0002] The speed adjustment of an AC induction motor needs to be achieved by means of the feedback of a speed sensor. Common speed sensors include Hall sensors, tachogenerators, encoders, etc. Among them, a tachogenerator is usually used for motor speed feedback. According to the motor speed, the feedback voltage signal range of the tachogenerator is generally 0.9V - 45V. When the motor speed is very low, the feedback voltage is very low, only about 0.9V. At this time, if the controller is far from the motor and the cable is long, the speed signal will be severely attenuated, and even the speed feedback signal will be submerged in the interference noise, resulting in the controller being unable to detect the speed signal at low motor speeds and the motor getting out of balance. Content of the Utility Model

[0003] The present utility model provides a signal enhancement device based on a speed measurement system. The analog signal output by the speed sensor is amplified and converted into a digital pulse signal through the signal enhancement device. The digital pulse signal has strong anti-interference ability, which greatly increases the effective transmission distance of the converted signal and realizes the long-distance transmission of the speed measurement signal.

[0004] In the first aspect, the embodiments of the present utility model provide a signal enhancement device based on a speed measurement system. The signal enhancement device is arranged between the signal output end of the speed sensor and the signal receiving end of the receiver;

[0005] The signal enhancement device includes a voltage clamping unit and an analog-to-digital conversion unit;

[0006] The voltage clamping unit is electrically connected to the signal output end, and is used to amplify and clamp the analog signal output by the signal output end to generate a first analog signal;

[0007] The analog-to-digital conversion unit is electrically connected to the voltage clamping unit and the signal receiving end respectively, and is used to convert the first analog signal into a digital pulse signal and output it to the signal receiving end.

[0008] Optionally, the speed sensor includes a tachogenerator, and the signal enhancement device is arranged at a position close to the signal output end of the tachogenerator.

[0009] Optionally, the voltage clamping unit includes a first diode and a first triode;

[0010] The signal receiving end includes a first receiving end and a second receiving end;

[0011] The first end of the first diode is electrically connected to the base of the first triode and the signal output terminal respectively, and the second end of the first diode is electrically connected to the emitter of the first triode;

[0012] The collector of the first triode is electrically connected to the first receiving terminal, and the emitter of the first triode is also electrically connected to the second receiving terminal.

[0013] Optionally, the analog-to-digital conversion unit multiplexes the first triode.

[0014] Optionally, the first triode includes an NPN-type triode.

[0015] Optionally, the signal enhancement device further includes a first filtering unit;

[0016] The first filtering unit is disposed between the signal output terminal and the voltage clamping unit, and is used for filtering the analog signal output from the signal output terminal.

[0017] Optionally, the voltage clamping unit includes a first diode and a first triode;

[0018] The first filtering unit includes a first filtering element and a second filtering element;

[0019] The first filtering element includes a first capacitor. The signal output terminal includes a first output terminal and a second output terminal. The first capacitor is connected in parallel between the first output terminal and the second output terminal;

[0020] The second filtering element includes a first resistor and a second capacitor;

[0021] The first end of the first resistor is electrically connected to the first plate of the first capacitor and the first output terminal respectively. The second end of the first resistor is electrically connected to the base of the first triode and the first plate of the second capacitor respectively. The second plate of the second capacitor is electrically connected to the second end of the first diode.

[0022] Optionally, the signal enhancement device further includes a second filtering unit;

[0023] The second filtering unit is disposed between the analog-to-digital conversion unit and the signal receiving terminal, and the second filtering unit is used for filtering the digital pulse signal.

[0024] Optionally, the second filtering unit includes a second resistor and a third capacitor;

[0025] The analog-to-digital conversion unit includes a first triode, and the signal receiving terminal includes a first receiving terminal and a second receiving terminal;

[0026] The third capacitor is connected in parallel between the first receiving end and the second receiving end. The first end of the second resistor is electrically connected to the first receiving end, and the second end of the second resistor is electrically connected to the collector of the first triode.

[0027] Optionally, the tachogenerator is used to supply power to the signal enhancement device.

[0028] An embodiment of the present invention discloses a signal enhancement device based on a speed measurement system. The signal enhancement device is arranged between the signal output end of a speed sensor and the signal receiving end of a receiver. The signal enhancement device includes a voltage clamping unit and an analog-to-digital conversion unit. The voltage clamping unit is electrically connected to the signal output end and is used to amplify and clamp the analog signal output by the signal output end to generate a first analog signal. The analog-to-digital conversion unit is electrically connected to the voltage clamping unit and the signal receiving end respectively, and is used to convert the first analog signal into a digital pulse signal and output it to the signal receiving end. In this way, without changing the structure and installation position of the speed sensor, the analog signal output by the speed sensor is amplified and converted into a digital pulse signal through the signal enhancement device. The digital pulse signal has strong anti-interference ability, so that the effective transmission distance of the converted signal is greatly increased, realizing the long-distance transmission of the speed measurement signal. Description of the Drawings

[0029] Figure 1 is a diagram showing the installation position of a signal enhancement device provided by an embodiment of the present invention;

[0030] Figure 2 is a specific circuit diagram of a signal enhancement device provided by an embodiment of the present invention. Detailed Embodiments

[0031] To make the objectives, technical solutions and advantages of the present invention clearer, the following will, in combination with the accompanying drawings in the embodiments of the present invention, completely describe the technical solutions of the present invention through specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present utility model are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0033] Figure 1 is a mounting position diagram of a signal enhancement device provided by an embodiment of the present utility model. Figure 2 is a specific circuit diagram of a signal enhancement device provided by an embodiment of the present utility model. Refer to Figure 1 and Figure 2 , the signal enhancement device 01 is arranged between the signal output end of the speed sensor 02 and the signal receiving end of the receiver 03. The signal enhancement device 01 includes a voltage clamping unit 10 and an analog-to-digital conversion unit 20. The voltage clamping unit 10 is electrically connected to the signal output end 200, and is used for amplifying and clamping the analog signal output by the signal output end 200 to generate a first analog signal. The analog-to-digital conversion unit 20 is electrically connected to the voltage clamping unit 10 and the signal receiving end 300 respectively, and is used for converting the first analog signal into a digital pulse signal and outputting it to the signal receiving end 300.

[0034] Specifically, as Figure 1 shown, the speed measurement system includes a speed sensor 02 and a receiver 03. Among them, the speed sensor 02 can be a tachogenerator. A tachogenerator is a micro motor that converts mechanical rotation speed into an electrical signal output, and its output voltage is proportional to the rotation speed. That is, the tachogenerator mainly converts mechanical rotation speed into a voltage signal, and the feedback voltage signal range is generally between 0.9V and 45V, so as to realize the monitoring and control of the motor rotation speed. And the voltage signal is an analog signal, that is, the signal output by the tachogenerator is an analog signal. Furthermore, when the rotation speed of the motor is low and the receiver 03 is far from the speed sensor 02 and the signal transmission cable is long, the analog signal output by the tachogenerator will be severely attenuated, and even the analog signal will be submerged in the interference noise, resulting in the receiver being unable to detect the speed signal when the motor rotation speed is low.

[0035] Therefore, on the basis that the speed sensor 02 is a tachogenerator in the embodiment of the present utility model, a signal enhancement device 01 is arranged between the signal output end 200 of the speed sensor 02 and the signal receiving end of the receiver 03. AsFigure 2 As shown, the signal enhancement device 01 includes a voltage clamping unit 10 and an analog-to-digital conversion unit 20. Among them, the voltage clamping unit 10 is used to amplify and clamp the analog signal output from the signal output terminal 200 (the voltage signal output by the tachogenerator), and then generate a stable and good first analog signal. At this time, although the analog signal output from the signal output terminal 200 is amplified, due to the characteristics of the analog signal, there will still be signal attenuation during long-distance transmission. Furthermore, in the embodiment of the present invention, an analog-to-digital conversion unit 20 is provided between the voltage clamping unit 10 and the signal receiving terminal 300. The first analog signal is converted into a digital pulse signal by the analog-to-digital conversion unit 20. The digital pulse signal has strong anti-interference ability and less attenuation during long-distance signal transmission, so that the effective transmission distance of the converted signal is greatly increased. It is realized that the tachogenerator can still detect the signal when the motor runs at a low speed and the signal is transmitted over a long distance, improving the reliability of detection. In addition, since the signal enhancement device 01 is arranged in the cable between the speed sensor 02 and the receiver 03, it is not necessary to change the structure and installation position of the speed sensor. Only the signal enhancement device 01 needs to be plugged into the signal output terminal 200, and the installation is simple and convenient.

[0036] It should be noted that, continue to refer to Figure 1 , the signal enhancement device 01 is arranged at a position close to the signal output terminal 300 of the tachogenerator. In other words, the analog signal output from the signal output terminal 300 is amplified and clamped by the voltage clamping unit 10 and then converted by the analog-to-digital conversion unit 20 before long-distance transmission. In this way, it is ensured that the effective transmission distance of the converted signal is greatly increased, realizing the long-distance transmission of the tachosignal. In addition, since the transmitted signal is a digital pulse signal during long-distance transmission, and the receiver 03 itself also receives a digital pulse signal, compared with the prior art solution that still requires a conversion module to be provided at the receiving end 03, the circuit structure of the receiver 03 is simplified.

[0037] It should also be noted that since the tachogenerator outputs a voltage signal, when the signal enhancement device 01 is arranged at the signal output terminal 200 of the tachogenerator, the signal enhancement device 01 can be directly powered by the tachogenerator, that is, as long as the tested motor rotates, the signal enhancement device 01 can work, without adding a new power supply structure for the signal enhancement device 01, further ensuring the simplicity of the overall circuit.

[0038] In summary, the embodiment of the present utility model discloses a signal enhancement device based on a speed measurement system. The signal enhancement device is arranged between the signal output end of the speed sensor and the signal receiving end of the receiver. The signal enhancement device includes a voltage clamping unit and an analog-to-digital conversion unit. The voltage clamping unit is electrically connected to the signal output end and is used to amplify and clamp the analog signal output by the signal output end to generate a first analog signal. The analog-to-digital conversion unit is electrically connected to the voltage clamping unit and the signal receiving end respectively, and is used to convert the first analog signal into a digital pulse signal and output it to the signal receiving end. In this way, without changing the structure and installation position of the speed sensor, the analog signal output by the speed sensor is amplified and converted into a digital pulse signal through the signal enhancement device. The digital pulse signal has strong anti-interference ability, so that the effective transmission distance of the converted signal is greatly increased, and the long-distance transmission of the speed measurement signal is realized.

[0039] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the voltage clamping unit 10 includes a first diode D1 and a first triode Q1. The signal receiving end 300 includes a first receiving end 301 and a second receiving end 302. The first end of the first diode D1 is electrically connected to the base of the first triode Q1 and the signal output end 200 respectively, and the second end of the first diode D1 is electrically connected to the emitter of the first triode Q1. The collector of the first triode Q1 is electrically connected to the first receiving end 301, and the emitter of the first triode Q1 is also electrically connected to the second receiving end 302. In this way, the voltage signal (analog signal) output by the signal output end 200 generates a first analog signal after being amplified and clamped by the first diode D1 and the first triode Q1, and is output to the analog-to-digital conversion unit 20. The analog-to-digital conversion unit 20 converts the first analog signal into a digital pulse signal to ensure the stability of the long-distance transmission of the speed measurement signal.

[0040] Optionally, on the basis of the above embodiment, continue to refer to Figure 2 , the analog-to-digital conversion unit 20 is multiplexed as the first triode Q1. That is, the voltage signal (analog signal) output by the signal output end 200 generates a digital pulse signal after being amplified and clamped by the first diode D1 and the first triode Q1 and converted by the first triode, thereby ensuring the stability of the long-distance transmission of the speed measurement signal.

[0041] It should be noted that the first triode Q1 can be an NPN-type triode. Specifically, the NPN-type triode has the capabilities of high switching speed, low power consumption, and strong amplification ability. Therefore, by setting the first triode Q1 as an NPN-type triode, it is ensured that the voltage clamping unit 10 can amplify the voltage signal (analog signal) output by the signal output end 200 into a high-voltage signal.

[0042] Optionally, on the basis of the above embodiment, continue to refer toFigure 2 Moreover, the signal enhancement device 01 further includes a first filtering unit 30. The first filtering unit 30 is disposed between the signal output terminal 200 and the voltage clamping unit 10 and is used to filter the analog signal output from the signal output terminal.

[0043] Specifically, in the embodiment shown as Figure 2 follows, the voltage clamping unit 10 includes a first diode D1 and a first triode Q1. The first filtering unit 30 may include a first filtering element and a second filtering element. Among them, the first filtering element includes a first capacitor C1. The signal output terminal 200 includes a first output terminal 201 and a second output terminal 202. The first capacitor C1 is connected in parallel between the first output terminal and the second output terminal. In this way, the first capacitor C1 performs primary filtering on the analog signal output from the signal output terminal 200, that is, filters the AC part in the DC voltage, making the output analog signal smoother. The second filtering element includes a first resistor R1 and a second capacitor C2. The first end of the first resistor R1 is electrically connected to the first plate of the first capacitor C1 and the first output terminal 201 respectively. The second end of the first resistor R1 is electrically connected to the base of the first triode Q1 and the first plate of the second capacitor C2 respectively. The second plate of the second capacitor C2 is electrically connected to the second end of the first diode D1. In this way, the first capacitor R1 and the second capacitor C2 perform secondary filtering on the analog signal, that is, allow high-frequency signals to pass through while attenuating low-frequency signals. It can be understood that both the primary filtering and the secondary filtering are filtering of the analog signal (voltage signal), that is, pre-stage filtering.

[0044] In addition, referring to Figure 2 continuously, the signal enhancement device 01 further includes a second filtering unit 40. The second filtering unit 40 is disposed between the analog-to-digital conversion unit 20 and the signal receiving terminal 300, and the second filtering unit 40 is used to filter the digital pulse signal.

[0045] Specifically, the second filtering unit 40 includes a second resistor R2 and a third capacitor C3. The analog-to-digital conversion unit 20 includes a first triode Q1. The signal receiving terminal 300 includes a first receiving terminal 301 and a second receiving terminal 302. The third capacitor C3 is connected in parallel between the first receiving terminal 301 and the second receiving terminal 302. The first end of the second resistor R2 is electrically connected to the first receiving terminal 301, and the second end of the second resistor R2 is electrically connected to the collector of the first triode Q1. In this way, the second resistor R2 and the third capacitor C3 form a high-pass filter, and the high-pass filter is used to allow high-frequency signals in the pulse digital signal to pass through while attenuating low-frequency signals, ensuring the accuracy of the measurement structure.

[0046] It should be noted that the signal enhancement device may further include a third resistor R3. The first end of the third resistor R3 is electrically connected to the second end of the first resistor R1 and the first plate of the second capacitor C2 respectively, and the second end of the third resistor R3 is electrically connected to the second plate of the second capacitor C2.

[0047] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, combinations with each other, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A signal enhancement device based on a speed measurement system, the speed measurement system including a speed sensor and a receiver, characterized in that, the signal enhancement device is arranged between the signal output end of the speed sensor and the signal receiving end of the receiver; the signal enhancement device includes a voltage clamping unit and an analog-to-digital conversion unit; the voltage clamping unit is electrically connected to the signal output end, and is used for amplifying and clamping the analog signal output by the signal output end to generate a first analog signal; the analog-to-digital conversion unit is electrically connected to the voltage clamping unit and the signal receiving end respectively, and is used for converting the first analog signal into a digital pulse signal and outputting it to the signal receiving end.

2. The signal enhancement device according to claim 1, characterized in that, the speed sensor includes a tachogenerator, and the signal enhancement device is arranged at a position close to the signal output end of the tachogenerator.

3. The signal enhancement device according to claim 1, characterized in that, the voltage clamping unit includes a first diode and a first triode; the signal receiving end includes a first receiving end and a second receiving end; the first end of the first diode is electrically connected to the base of the first triode and the signal output end respectively, and the second end of the first diode is electrically connected to the emitter of the first triode; the collector of the first triode is electrically connected to the first receiving end, and the emitter of the first triode is also electrically connected to the second receiving end.

4. The signal enhancement device according to claim 3, characterized in that, the analog-to-digital conversion unit multiplexes the first triode.

5. The signal enhancement device according to claim 4, characterized in that, the first triode includes an NPN type triode.

6. The signal enhancement device according to claim 1, wherein The signal enhancement device further includes a first filtering unit; the first filtering unit is arranged between the signal output end and the voltage clamping unit, and is used for filtering the analog signal output by the signal output end.

7. The signal enhancement device according to claim 6, characterized in that, the voltage clamping unit includes a first diode and a first triode; the first filtering unit includes a first filtering element and a second filtering element; the first filtering element includes a first capacitor, the signal output end includes a first output end and a second output end, and the first capacitor is arranged in parallel between the first output end and the second output end; the second filtering element includes a first resistor and a second capacitor; the first end of the first resistor is electrically connected to the first plate of the first capacitor and the first output end respectively, the second end of the first resistor is electrically connected to the base of the first triode and the first plate of the second capacitor respectively, and the second plate of the second capacitor is electrically connected to the second end of the first diode.

8. The signal enhancement device according to claim 1, characterized in that, the signal enhancement device further includes a second filtering unit; the second filtering unit is arranged between the analog-to-digital conversion unit and the signal receiving end, and the second filtering unit is used for filtering the digital pulse signal.

9. The signal enhancement device according to claim 8, wherein The second filtering unit includes a second resistor and a third capacitor; The analog-to-digital conversion unit includes a first triode, and the signal receiving end includes a first receiving end and a second receiving end; The third capacitor is connected in parallel between the first receiving end and the second receiving end. The first end of the second resistor is electrically connected to the first receiving end, and the second end of the second resistor is electrically connected to the collector of the first triode.

10. The signal enhancement device according to claim 2, wherein The tachogenerator is used to supply power to the signal enhancement device.

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