Sensing signal processor of high-speed overload and unbalanced load detection device

Abstract

The utility model discloses a sensing signal processor of a high-speed overload and unbalanced load detection device, relates to the field of signal amplification, and solves the technical problem that the existing overload and unbalanced load detection device is low in acquisition precision and reliability. The system comprises an amplification circuit, a plurality of single-path sensor signal amplification units are arranged in the amplification circuit, and the number of the single-path sensor signal amplification units is consistent with the number of sensors in a sensor module; the signal input end of the single-path sensor signal amplification unit is connected with the signal output end of a sensor, the single-path sensor signal amplification unit comprises a low-leakage diode module and an instrument amplifier, and the two ends of the low-leakage diode module are connected with the signal output ends of the single sensor in a one-to-one correspondence mode. The two ends of the low-leakage diode module are connected with the two input ends of the instrument amplifier in a one-to-one correspondence mode. According to the utility model, the accuracy of signal amplification is ensured while surge is prevented, and extreme overload voltage is prevented from entering the equipment from a signal line to damage the equipment.

Description

Technical Field

[0001] The utility model relates to the field of signal amplification, and more specifically, to a sensor signal processor of a high-speed overload detection device. Background Art

[0002] The on-track overload and unbalanced load detection device is a metering device installed along the railway line to dynamically detect overload and unbalanced load on the moving train. This device is an important part of my country's railway freight measurement and safety detection system. At present, the operating speed of my country's railway trains has been greatly improved, and a large number of electrified railways have been opened, which has put forward higher requirements for cargo loading and reinforcement. The position of freight safety in railway transportation safety is becoming increasingly prominent, which requires the installation of a large number of dynamic electronic track scales and freight train overload and unbalanced load detection devices along the railway lines. However, the data collected by the existing overload and unbalanced load detection device when the train passes at high speed is of low accuracy, and the design is easily interfered by extreme overload voltage, and the reliability is low. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a high-speed overload and eccentric load detection device sensor signal processor in view of the deficiencies of the prior art, so as to solve the problems of low acquisition accuracy and reliability of the prior overload and eccentric load detection device.

[0004] The utility model discloses a sensor signal processor for a high-speed overload detection device, which includes an amplifying circuit, in which a plurality of single-channel sensor signal amplifying units are provided, and the number of the single-channel sensor signal amplifying units is consistent with the number of sensors in a sensor module; the signal input end of the single-channel sensor signal amplifying unit is connected to the signal output end of the sensor, and the single-channel sensor signal amplifying unit includes a low-leakage diode module and an instrument amplifier, the two ends of the low-leakage diode module are connected one-to-one with the two signal output ends of the sensor, and the two ends of the low-leakage diode module are connected one-to-one with the positive input end and the negative input end of the instrument amplifier.

[0005] As a further improvement, the low leakage diode module includes a 101st low leakage diode, a 102nd low leakage diode, a 103rd low leakage diode and a 104th low leakage diode;

[0006] The cathode of the one hundred and fourth low leakage diode is connected to the first signal input terminal of the sensor through the one hundred and first resistor, the cathode of the one hundred and fourth low leakage diode is also connected to the anode of the one hundred and first low leakage diode, and the connection end thereof is connected to the inverting input terminal of the instrumentation amplifier;

[0007] The cathode of the one hundred and third low leakage diode is connected to the second signal input terminal of the sensor through the one hundred and second resistor, the cathode of the one hundred and third low leakage diode is connected to the anode of the one hundred and second low leakage diode, and the connection end thereof is connected to the non-inverting input terminal of the instrumentation amplifier;

[0008] The anode of the 103rd low leakage diode is connected to the anode of the 104th low leakage diode, and the connection end thereof is connected to a -12V voltage source; the cathode of the 101st low leakage diode is connected to the cathode of the 102nd leakage diode, and the connection end thereof is connected to a +12V voltage source.

[0009] Furthermore, the output end of the instrument amplifier is connected to a filter circuit.

[0010] Furthermore, the filtering circuit includes a second operational amplifier, the output end of the instrumentation amplifier is connected to the non-inverting input end of the second operational amplifier through the one-hundred-and-sixth resistor and the one-hundred-and-seventh resistor, the output end of the second operational amplifier is connected to the connecting end of the one-hundred-and-sixth leakage resistor and the one-hundred-and-seventh resistor through the one-hundred-and-fifth capacitor, the connecting end of the one-hundred-and-seventh resistor and the second operational amplifier is grounded through the one-hundred-and-sixth capacitor, the inverting input end of the second operational amplifier is connected to the output end of the second operational amplifier, and the output end of the second operational amplifier serves as the output end of the single-channel sensor signal amplification unit.

[0011] Furthermore, the model of the second operational amplifier is OPA207D.

[0012] Furthermore, the sixth pin of the instrument amplifier is connected to a voltage follower circuit.

[0013] Furthermore, the voltage follower circuit includes a first operational amplifier and an adjustable resistor, the two ends of the 5V power supply are connected to the two ends of the adjustable resistor in a one-to-one correspondence through the one-hundred-and-fourth resistor and the one-hundred-and-fifth resistor respectively, the adjustment end of the adjustable resistor is connected to the non-inverting input end of the first operational amplifier, the inverting input end of the first operational amplifier is connected to the output end of the first operational amplifier, and the output end of the first operational amplifier is connected to the output end of the instrumentation amplifier.

[0014] Furthermore, the model of the first operational amplifier is OP1177ARZ.

[0015] Furthermore, the model of the instrument amplifier is AD8221.

[0016] Furthermore, the sensor signal processor also includes a power supply filtering circuit, an amplifier circuit, a power supply circuit, a zeroing module and an A / D acquisition circuit; the input end of the power supply filtering circuit is connected to an external power supply, the output end of the power supply filtering circuit is connected to the input end of the power supply circuit through a transformer, the output end of the power supply circuit is connected to the power input end of the amplifier circuit, the input end of the zeroing module is connected to the zeroing input end of the amplifier circuit, and the signal output end of the amplifier circuit is connected to the signal acquisition end of the A / D acquisition circuit.

[0017] Beneficial Effects

[0018] The advantages of the utility model are:

[0019] 1. By designing the power supply filter circuit, transformer, power supply circuit, amplifier circuit, zero adjustment module, A / D acquisition circuit and sensor module, it has the functions of filtering out external interference signals and output zero adjustment, and can accurately amplify the weak signal of the overload sensor at the mV level to the V level to meet the requirements of A / D sampling conversion.

[0020] 2. By installing a low leakage diode module on the amplifier circuit, the accuracy of signal amplification is guaranteed while preventing surges, preventing extreme overload voltage from being connected to the signal line and damaging the equipment.

[0021] 3. By using a linear power supply instead of a switching power supply in the power supply circuit, the accuracy of AC to DC conversion can be improved and the ripple can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the device of the utility model;

[0023] Figure 2 This is a schematic diagram of the power supply circuit of the utility model;

[0024] Figure 3 This is the schematic diagram of the amplifier circuit of the utility model;

[0025] Figure 4 This is a schematic diagram of the power filter circuit of the utility model.

[0026] Among them: U1-first three-terminal voltage regulator chip, U2-second three-terminal voltage regulator chip, U3-third operational amplifier, U4-precision voltage source chip, U5-fourth operational amplifier, U6-fifth operational amplifier, Q1-first MOS tube, Q2-second MOS tube, U101-instrumentation amplifier, U103-first operational amplifier, U102-second operational amplifier, R101-one hundred and first resistor, R102-one hundred and second resistor, R103-one hundred and third resistor, R104-one hundred and fourth resistor, R105-one hundred and fifth resistor, R106-one hundred and sixth resistor, R107-one hundred and seventh resistor, RZ103-adjustable resistor , C101-the one hundred and first capacitor, C102-the one hundred and second capacitor, C103-the one hundred and third capacitor, C104-the one hundred and fourth capacitor, C105-the one hundred and fifth capacitor, C111-the one hundred and ten capacitor, C112-the one hundred and twelfth capacitor, D101-the one hundred and first low leakage diode, D102-the one hundred and second low leakage diode, D103-the one hundred and third leakage diode, D104-the one hundred and fourth leakage diode, R1-the first varistor, R2-the second varistor, R3-the third varistor, L1-common mode choke, C1-the first capacitor, C2-the second capacitor, C3-the third capacitor, C4-the fourth capacitor. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the embodiments, but does not constitute any limitation to the utility model. Any limited modifications made by anyone within the scope of the claims of the utility model are still within the scope of the claims of the utility model.

[0028] See also Figure 1-Figure 4 The utility model discloses a high-speed overload detection device sensor signal processor, which includes an amplifying circuit, in which a plurality of single-channel sensor signal amplifying units are arranged, and the number of the single-channel sensor signal amplifying units is consistent with the number of sensors in the sensor module; the signal input end of the single-channel sensor signal amplifying unit is connected to the signal output end of the sensor, and the single-channel sensor signal amplifying unit includes a low leakage diode module and an instrument amplifier U101, and the two ends of the low leakage diode module are connected to the two signal output ends of the sensor in a one-to-one correspondence, and the two ends of the low leakage diode module are connected to the positive phase input end and the negative phase input end of the instrument amplifier U101 in a one-to-one correspondence.

[0029] The low leakage diode module includes a one hundred and first low leakage diode D101, a one hundred and second low leakage diode D102, a one hundred and third low leakage diode D103 and a one hundred and fourth low leakage diode D104;

[0030] The cathode of the one hundred and fourth low leakage diode D104 is connected to the first signal input terminal of the sensor through the one hundred and first resistor R101, the cathode of the one hundred and fourth low leakage diode D104 is also connected to the anode of the one hundred and first low leakage diode D101, and its connection end is connected to the inverting input terminal of the instrumentation amplifier U101;

[0031] The cathode of the one hundred and third low leakage diode D103 is connected to the second signal input terminal of the sensor through the one hundred and second resistor R102, the cathode of the one hundred and third low leakage diode D103 is connected to the anode of the one hundred and second low leakage diode D102, and the connection end thereof is connected to the non-inverting input terminal of the instrumentation amplifier U101;

[0032] The anode of the one hundred and third low leakage diode D103 is connected to the anode of the one hundred and fourth low leakage diode D104, and the connection end thereof is connected to a -12V voltage source; the cathode of the one hundred and first low leakage diode D101 is connected to the cathode of the one hundred and second low leakage diode D102, and the connection end thereof is connected to a +12V voltage source.

[0033] Among them, the low leakage diode is BAV199. The utility model clamps through a low leakage diode module composed of four low leakage diodes, which can prevent surges and also ensure the accuracy of signal amplification to the greatest extent, thereby improving reliability.

[0034] The seventh pin of the instrumentation amplifier U101 is connected to a filter circuit. The filter circuit includes a second operational amplifier U102, the output end of the instrumentation amplifier U101 is connected to the non-inverting input end of the second operational amplifier U102 through the one-hundred-sixth resistor R106 and the one-hundred-seventh resistor R107, the output end of the second operational amplifier U102 is connected to the connection end of the one-hundred-sixth resistor R106 and the one-hundred-seventh resistor R107 through the one-hundred-fifth capacitor C105, the one-hundred-seventh resistor R107 and the second operational amplifier U102 are grounded through the one-hundred-sixth capacitor C106, the inverting input end of the second operational amplifier U102 is connected to the output end of the second operational amplifier U102, and the output end of the second operational amplifier U102 serves as the output end of the single-channel sensor signal amplification unit.

[0035] The filter circuit adopts two-stage filtering. The first-stage filtering uses resistors and capacitors to form a low-pass RC filter circuit to filter out high-frequency interference signals; the second-stage filtering performs another filtering on the amplified signal, using an active low-pass second-order filter circuit.

[0036] The model of the second operational amplifier U102 is OPA207D, and the cut-off frequency is 250 Hz.

[0037] The sixth pin of the instrumentation amplifier U101 is connected to a voltage follower circuit. The voltage follower circuit includes a first operational amplifier U103 and an adjustable resistor RZ103, two ends of a 5V power supply are respectively connected to two ends of the adjustable resistor RZ103 through a one-one-one correspondence of a one-hundred-fourth resistor R104 and a one-hundred-fifth resistor R105, an adjustment end of the adjustable resistor RZ103 is connected to a non-inverting input end of the first operational amplifier U103, an inverting input end of the first operational amplifier U103 is connected to an output end of the first operational amplifier U103, and an output end of the first operational amplifier U103 is connected to an output end of the instrumentation amplifier U101.

[0038] The model of the first operational amplifier U103 is OP1177ARZ.

[0039] The model of instrumentation amplifier U101 is AD8221. AD8221 is a gain programmable, high-performance instrumentation amplifier with low voltage offset, low offset drift, low gain drift, high gain accuracy and high common-mode rejection ratio. It has the highest common-mode rejection ratio (CMRR) performance relative to frequency, can suppress broadband interference and linear harmonics, greatly simplifies the filter requirements, and can set the gain from 1 to 1000 through a resistor. The amplification factor G is designed to be 603 times.

[0040] The formula for calculating the magnification is:

[0041]

[0042] In the formula, R G =R103=82Ω, then the amplification factor is approximately equal to 603.

[0043] Since the voltage reference pin REF of AD8221 must maintain a low source impedance, a voltage follower circuit is designed using the first operational amplifier OP1177ARZ to ensure that the zero-adjusted voltage is connected to the voltage reference pin REF of AD8221 with a low source impedance.

[0044] The sensor signal processor also includes a power supply filtering circuit, an amplifier circuit, a power supply circuit, a zero adjustment module and an A / D acquisition circuit; the input end of the power supply filtering circuit is connected to an external power supply, the output end of the power supply filtering circuit is connected to the input end of the power supply circuit through a transformer, the output end of the power supply circuit is connected to the power input end of the amplifier circuit, the input end of the zero adjustment module is connected to the zero adjustment input end of the amplifier circuit, and the signal output end of the amplifier circuit is connected to the signal acquisition end of the A / D acquisition circuit.

[0045] It should be noted that the sensor, zero adjustment module and A / D acquisition circuit are all existing circuit modules on the market and belong to the existing technology, so this article will not discuss them further. The power supply circuit and power supply filter circuit can be used as follows Figure 2and Figure 4 The power supply circuit can be as follows: Figure 2 The circuit structure shown in FIG. 1 includes a first three-terminal voltage regulator chip U1, a second three-terminal voltage regulator chip U2, a third operational amplifier U3, a precision voltage source chip U4, a fourth operational amplifier U5, a fifth operational amplifier U6, a first MOS transistor Q1 and a second MOS transistor Q2. The power supply filter circuit can also be used as shown in FIG. Figure 4 In the circuit structure shown, the power supply filter circuit includes a first varistor R1, a second varistor R2, a third varistor R3, a common mode choke L1, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4.

[0046] Working principle: The external 220V AC power supply is suppressed and filtered by the power filter circuit to form a specific AC 220V voltage, and then the AC 220V voltage is converted by the transformer to form an AC 12V voltage, and then the AC 12V voltage is converted by the power circuit to form a DC 5V voltage and a DC 12V voltage. The DC 5V voltage and the DC 12V voltage are respectively input into the corresponding power input terminals of the amplifier circuit to power the amplifier circuit;

[0047] The signals of the sensor module are transmitted to the corresponding signal input ends of the 14 single-channel sensor signal amplification units through the corresponding output ends. The weak mV-level signals of the sensor module in the amplification circuit are precisely amplified to V-level, and the amplification circuit then inputs the amplified signals into the acquisition circuit.

[0048] The above are only preferred implementations of the utility model. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the utility model, which will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A sensor signal processor for a high-speed overload detection device, characterized in that: It comprises an amplifying circuit, wherein the amplifying circuit is provided with a plurality of single-channel sensor signal amplifying units, and the number of the single-channel sensor signal amplifying units is consistent with the number of sensors in a sensor module; the signal input end of the single-channel sensor signal amplifying unit is connected to the signal output end of the sensor, and the single-channel sensor signal amplifying unit comprises a low leakage diode module and an instrument amplifier (U101), wherein the two ends of the low leakage diode module are connected to the two signal output ends of the sensor in a one-to-one correspondence, and the two ends of the low leakage diode module are connected to the positive phase input end and the negative phase input end of the instrument amplifier (U101) in a one-to-one correspondence.

2. The sensor signal processor of a high-speed overload detection device according to claim 1, characterized in that: The low leakage diode module includes a one hundred and first low leakage diode (D101), a one hundred and second low leakage diode (D102), a one hundred and third low leakage diode (D103) and a one hundred and fourth low leakage diode (D104); The cathode of the one hundred and fourth low leakage diode (D104) is connected to the first signal input terminal of the sensor through the one hundred and first resistor (R101), the cathode of the one hundred and fourth low leakage diode (D104) is also connected to the anode of the one hundred and first low leakage diode (D101), and its connection end is connected to the inverting input terminal of the instrument amplifier (U101); The cathode of the first one hundred and third low leakage diode (D103) is connected to the second signal input terminal of the sensor through the first one hundred and second resistor (R102), the cathode of the first one hundred and third low leakage diode (D103) is connected to the anode of the first one hundred and second low leakage diode (D102), and the connection end thereof is connected to the non-inverting input terminal of the instrument amplifier (U101); The anode of the 103rd low leakage diode (D103) is connected to the anode of the 104th low leakage diode (D104), and the connection end thereof is connected to a -12V voltage source; the cathode of the 101st low leakage diode (D101) is connected to the cathode of the 102nd leakage diode (D102), and the connection end thereof is connected to a +12V voltage source.

3. The sensor signal processor of a high-speed overload detection device according to claim 1, characterized in that: The output end of the instrument amplifier (U101) is connected to a filter circuit.

4. A sensor signal processor for a high-speed overload detection device according to claim 3, characterized in that: The filtering circuit comprises a second operational amplifier (U102), the output end of the instrumentation amplifier (U101) is connected to the non-inverting input end of the second operational amplifier (U102) through a one-hundred-sixth resistor (R106) and a one-hundred-seventh resistor (R107), the output end of the second operational amplifier (U102) is connected to the connection end of the one-hundred-sixth resistor (R106) and the one-hundred-seventh resistor (R107) through a one-hundred-fifth capacitor (C105), the connection end between the one-hundred-seventh resistor (R107) and the second operational amplifier (U102) is grounded through a one-hundred-sixth capacitor (C106), the inverting input end of the second operational amplifier (U102) is connected to the output end of the second operational amplifier (U102), and the output end of the second operational amplifier (U102) serves as the output end of the single-channel sensor signal amplification unit.

5. The sensor signal processor of the high-speed overload detection device according to claim 4, characterized in that: The model of the second operational amplifier (U102) is OPA207D.

6. The sensor signal processor of a high-speed overload detection device according to claim 1, characterized in that: The sixth pin of the instrument amplifier (U101) is connected to a voltage follower circuit.

7. A sensor signal processor for a high-speed overload detection device according to claim 6, characterized in that: The voltage follower circuit comprises a first operational amplifier (U103) and an adjustable resistor (RZ103); the two ends of a 5V power supply are connected to the two ends of the adjustable resistor (RZ103) in a one-to-one correspondence through a one-hundred-and-fourth resistor (R104) and a one-hundred-and-fifth resistor (R105), respectively; the adjustment end of the adjustable resistor (RZ103) is connected to the non-inverting input end of the first operational amplifier (U103); the inverting input end of the first operational amplifier (U103) is connected to the output end of the first operational amplifier (U103); and the output end of the first operational amplifier (U103) is connected to the output end of an instrumentation amplifier (U101).

8. The sensor signal processor of the high-speed overload detection device according to claim 7, characterized in that: The model of the first operational amplifier (U103) is OP1177ARZ.

9. The sensor signal processor of a high-speed overload detection device according to claim 1, characterized in that: The model of the instrument amplifier (U101) is AD8221.

10. The sensor signal processor of the high-speed overload detection device according to claim 1, characterized in that: The sensor signal processor also includes a power supply filtering circuit, an amplifier circuit, a power supply circuit, a zero adjustment module and an A / D acquisition circuit; the input end of the power supply filtering circuit is connected to an external power supply, the output end of the power supply filtering circuit is connected to the input end of the power supply circuit through a transformer, the output end of the power supply circuit is connected to the power supply input end of the amplifier circuit, the input end of the zero adjustment module is connected to the zero adjustment input end of the amplifier circuit, and the signal output end of the amplifier circuit is connected to the signal acquisition end of the A / D acquisition circuit.

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