Power supply device for improving use stability of industrial sensor

Abstract

The utility model discloses a power supply device for improving use stability of an industrial sensor, which comprises a filtering unit and a power supply unit, the filtering unit adopts an EMC circuit and comprises an input terminal, a first common-mode inductor and a second common-mode inductor, a ground wire pin of the input terminal is grounded, a fuse and a second capacitor are connected in series between an anode pin and a cathode pin, and the first common-mode inductor and the second common-mode inductor are connected in series. The primary side of the first common-mode inductor is connected in parallel with the third capacitor, the secondary side of the first common-mode inductor is connected in series with the primary side of the second common-mode inductor after being connected in parallel with the fourth capacitor and the fifth capacitor, and the secondary side of the second common-mode inductor is connected in parallel with the sixth capacitor and the seventh capacitor; the power supply unit comprises an isolation power supply and an output terminal. According to the utility model, the defect that the traditional industrial sensor is easily interfered by external power supply and environmental noise can be overcome, the sensor detection circuit is protected from the two ways of structure and circuit, and the detection precision and the interference resistance are improved.

Description

Technical Field

[0001] The utility model relates to a sensor power supply device, and more specifically, to a power supply device capable of improving the use stability of an industrial sensor. Background Art

[0002] As more and more equipment needs to be monitored in industrial sites, the required stability is gradually increasing, which requires that the sensor should pay attention to the stability of its own design during use. At present, the main focus of methods to improve sensor stability is on electromagnetic shielding on the transmission path and shielding on the processing circuit, and little attention is paid to the interference of the sensor power supply path. This makes it impossible to guarantee the stability of the sensor value from the source, and no matter what technology is used later, it is impossible to obtain stable sensor values. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a power supply device for improving the stability of industrial sensor use, which can solve the defect that traditional industrial sensors are easily interfered by external power supply and environmental noise, protect the sensor detection circuit, and improve the detection accuracy and anti-interference degree.

[0004] The purpose of the utility model is achieved through the following technical solutions.

[0005] The utility model improves the stability of the use of industrial sensors. The power supply device comprises a filter unit and a power supply unit. The filter unit adopts an EMC circuit, comprises an input terminal, a first common mode inductor, and a second common mode inductor. The ground wire pin of the input terminal is grounded. A fuse and a No. 2 capacitor are connected in series between the positive pin and the negative pin of the input terminal. The No. 2 capacitor is connected in parallel with a No. 3 capacitor. The primary side of the first common mode inductor is connected in parallel with the No. 3 capacitor, and the secondary side is connected in parallel with the No. 4 capacitor and the No. 5 capacitor, and then connected in series with the primary side of the second common mode inductor. The secondary side of the second common mode inductor is connected in parallel with the No. 6 capacitor and the No. 7 capacitor.

[0006] The power supply unit includes an isolated power supply and an output terminal. The ground port of the isolated power supply is grounded via a capacitor No. 1, the input port of the isolated power supply is grounded via a capacitor No. 9, the capacitor No. 7 is connected between the ground port and the input port of the isolated power supply, the output positive port and the output negative port of the isolated power supply are connected with a capacitor No. 8, the output positive port and the output negative port of the isolated power supply are respectively connected to the positive pin and the negative pin of the output terminal, the positive pin of the output terminal is grounded via a capacitor No. 12 and a capacitor No. 13 connected in series, and the negative pin of the output terminal is grounded via a capacitor No. 11 and a capacitor No. 10 connected in series. The filter unit and the power supply unit are integrated on a circuit board, and the circuit board is protected by a shielding cover.

[0007] Furthermore, when in use, the input terminal is connected to a power source, and the output terminal is connected to a sensor via a transmission line, and the transmission line is a double-layer shielded cable.

[0008] Furthermore, the No. 2 capacitor, No. 5 capacitor, No. 6 capacitor, No. 7 capacitor, and No. 8 capacitor are all electrolytic capacitors.

[0009] Compared with the prior art, the beneficial effects brought about by the technical solution of the utility model are:

[0010] (1) The utility model uses double-layer shielded cables and effective grounding for the sensor transmission cable, and uses a shielding cover structure for protection of the circuit board, which effectively reduces environmental noise. An EMC circuit is used at the power supply end of the circuit to reduce source interference and minimize the output bias voltage or current ripple.

[0011] (2) In the circuit of the high-performance sensor used in the utility model, the same circuit design can better reduce the bias ripple through line shielding and power supply, and improve the detection stability by more than 10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a circuit principle diagram of a power supply device for improving the use stability of industrial sensors.

[0013] Figure 2 It is the change of DPM-RMS value when the power supply device of the utility model is not used.

[0014] Figure 3 It is the change of DPM-RMS value after using the power supply device of the utility model.

[0015] Figure markings: P1-input terminal, P2-output terminal, M1-isolated power supply, L1-first common-mode inductor, L2-second common-mode inductor, F1-fuse, Earth-ground, C1-capacitor No. 1, C2-capacitor No. 2, C3-capacitor No. 3, C4-capacitor No. 4, C5-capacitor No. 5, C6-capacitor No. 6, C7-capacitor No. 7, C8-capacitor No. 8, C9-capacitor No. 9, C10-capacitor No. 10, C11-capacitor No. 11, C12-capacitor No. 12, C13-capacitor No. 13. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings.

[0017] like Figure 1 As shown, the power supply device of the utility model for improving the stability of use of industrial sensors mainly includes a filter unit and a power supply unit. The filter unit and the power supply unit are integrated on a circuit board, and the circuit board is protected by a shielding cover.

[0018] The filtering unit adopts an EMC circuit, including an input terminal P1, a first common-mode inductor L1, and a second common-mode inductor L2. The ground pin "3" of the input terminal P1 is grounded to Earth, a fuse F1 and a No. 2 capacitor C2 are connected in series between the positive pin "1" and the negative pin "2" of the input terminal P1, and the No. 3 capacitor C3 is connected in parallel to the No. 2 capacitor C2. The primary side of the first common-mode inductor L1 is connected in parallel to the No. 3 capacitor C3, and the secondary side is connected in parallel to the No. 4 capacitor C4 and the No. 5 capacitor C5, and then connected in series with the primary side of the second common-mode inductor L2, and the secondary side of the second common-mode inductor L2 is connected in parallel to the No. 6 capacitor C6 and the No. 7 capacitor C7.

[0019] The power supply unit includes an isolated power supply M1 and an output terminal P2. The ground port "GND" of the isolated power supply M1 is grounded to Earth via a No. 1 capacitor C1. The input port "Vin" of the isolated power supply M1 is grounded to Earth via a No. 9 capacitor C9. The No. 7 capacitor C7 is connected between the ground port "GND" and the input port "Vin" of the isolated power supply M1. A No. 8 capacitor C8 is connected between the output positive port "+Vo" and the output negative port "0V" of the isolated power supply M1. The output positive port "+Vo" and the output negative port "0V" of the isolated power supply M1 are respectively connected to the positive pin "1" and the negative pin "2" of the output terminal P2. The positive pin "1" of the output terminal P2 is grounded to Earth via a No. 12 capacitor C12 and a No. 13 capacitor C13 connected in series. The negative pin "2" of the output terminal P2 is grounded to Earth via a No. 11 capacitor C11 and a No. 10 capacitor C10 connected in series.

[0020] When in use, the input terminal P1 is connected to a power source, and the output terminal P2 is connected to a sensor via a transmission line, and the transmission line is a double-layer shielded cable.

[0021] In the above device, the second capacitor C2, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, and the eighth capacitor C8 are all electrolytic capacitors. Each capacitor can be selected according to the parameters shown in Table 1 below.

[0022] Table 1

[0023] capacitance parameter Capacitor No. 1 C1 2200pF / 400VAC Capacitor No. 2 C2 100μF / 200V Capacitor No. 3 C3 2.2μF / 250V Capacitor No. 4 C4 2.2μF / 250V Capacitor C5 100μF / 200V Capacitor No. 6 C6 100μF / 200V Capacitor C7 100μF / 200V Capacitor C8 100μF / 200V No. 9 capacitor C9 2200pF / 400VAC Capacitor C10 47nF / 630V Capacitor C11 47nF / 630V Capacitor C12 47nF / 630V Capacitor No. 13 C13 47nF / 630V

[0024] Due to the surge interference at the power input end, the vibration signal acquisition value is inaccurate, such as Figure 2 As shown in the figure, in an environment where there is no vibration signal input to the vibration sensor, and without the addition of the power supply device of the utility model, the system still measures the vibration value, and the maximum vibration value is 13.13, which affects the subsequent data judgment of the system. After the power supply at the power input end is stabilized and there is no significant ripple, the vibration value is not measured when there is no vibration signal input to the vibration sensor, such as Figure 3As shown, after adding the power supply device of the utility model, the vibration value is consistent with the actual situation, both are 0, the data is accurate, and each channel has been significantly reduced. Through experiments, it is proved that the measurement value of the vibration sensor can be reduced by 90%.

[0025] Although the functions and working processes of the utility model are described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific functions and working processes, and the above-mentioned specific implementation methods are merely illustrative rather than restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the utility model and the claims, which are all within the protection of the utility model.

Claims

1. A power supply device for improving the stability of industrial sensor use, comprising a filter unit and a power supply unit, characterized in that: The filtering unit adopts an EMC circuit, including an input terminal (P1), a first common-mode inductor (L1), and a second common-mode inductor (L2); the ground wire pin of the input terminal (P1) is grounded (Earth); a fuse (F1) and a No. 2 capacitor (C2) are connected in series between the positive pin and the negative pin of the input terminal (P1); the No. 2 capacitor (C2) is connected in parallel with a No. 3 capacitor (C3); the primary side of the first common-mode inductor (L1) is connected in parallel with the No. 3 capacitor (C3); the secondary side is connected in parallel with the No. 4 capacitor (C4) and the No. 5 capacitor (C5), and then connected in series with the primary side of the second common-mode inductor (L2); the secondary side of the second common-mode inductor (L2) is connected in parallel with the No. 6 capacitor (C6) and the No. 7 capacitor (C7); The power supply unit comprises an isolated power supply (M1) and an output terminal (P2), the ground port of the isolated power supply (M1) is grounded (Earth) via a No. 1 capacitor (C1), the input port of the isolated power supply (M1) is grounded (Earth) via a No. 9 capacitor (C9), the No. 7 capacitor (C7) is connected between the ground port and the input port of the isolated power supply (M1), a No. 8 capacitor (C8) is connected between the output positive port and the output negative port of the isolated power supply (M1), the output positive port and the output negative port of the isolated power supply (M1) are respectively connected to the positive pin and the negative pin of the output terminal (P2), the positive pin of the output terminal (P2) is grounded (Earth) via a No. 12 capacitor (C12) and a No. 13 capacitor (C13) connected in series, and the negative pin of the output terminal (P2) is grounded (Earth) via a No. 11 capacitor (C11) and a No. 10 capacitor (C10) connected in series.

2. The power supply device for improving the stability of use of industrial sensors according to claim 1, characterized in that: The filter unit and the power supply unit are integrated on a circuit board, and the circuit board is protected by a shielding cover.

3. The power supply device for improving the stability of industrial sensor use according to claim 1, characterized in that: When in use, the input terminal (P1) is connected to a power source, and the output terminal (P2) is connected to a sensor via a transmission line, wherein the transmission line is a double-layer shielded cable.

4. The power supply device for improving the stability of use of industrial sensors according to claim 1, characterized in that: The capacitor No. 2 (C2), capacitor No. 5 (C5), capacitor No. 6 (C6), capacitor No. 7 (C7), and capacitor No. 8 (C8) are all electrolytic capacitors.

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