Direct-current equipment power supply monitoring system for polar environment

Abstract

The invention relates to the technical field of polar environment power supply equipment monitoring. Due to the lack of a monitoring device for direct-current power supply equipment, whether equipment power supply in a polar environment is normal or not is the most important link for avoiding errors in data monitoring; the invention provides a direct-current equipment power supply monitoring system for a polar region environment, which is connected between a detected direct-current power supply and direct-current equipment and is used for monitoring voltage and current parameters of the direct-current power supply equipment in the polar region outdoor environment in real time and visually displaying the voltage and current parameters. And meanwhile, the monitored signal of the direct current power supply equipment is transmitted to the upper computer and the server by using the wireless transmission system, so that long-distance wireless transmission of the signal can be realized, overvoltage alarm and overcurrent alarm can be provided, accurate power supply parameters can be provided for subsequent direct current equipment fault detection, and the reliability of direct current equipment detection can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of polar environment power supply equipment monitoring, and more particularly to a DC equipment power supply monitoring system for polar environments. Background Art

[0002] Under the conditions of harsh polar environment and energy shortage, the micro-nano sensor integrated test system has the advantages of intelligence, high integration and low energy consumption, which can effectively reduce polar energy consumption and relieve the work pressure of polar personnel. Based on the research on the influencing mechanism of sensor stability and reliability under extreme conditions, the scientific expedition team will form a sensor environment decoupling design method, explore the sensor anti-altitude cold packaging process, and realize the widespread application of micro-nano sensor monitoring system in Antarctic scientific expedition. The development and application of such sensor monitoring system can provide accurate polar environment monitoring data, improve the automation level of polar scientific expedition equipment, and use advanced monitoring technology to monitor and protect the health of scientific expedition personnel in real time, provide data support and decision-making reference to promote the research on polar environment and human physiological adaptability, improve the safety and efficiency of polar exploration, and promote the development of polar science. Extreme environments such as polar high cold, high seawater salinity, high waves, storms, snow, floating ice and polar nights have put forward more stringent requirements on the reliability of polar equipment. In order to effectively improve the automation level of polar scientific research equipment and reduce the work pressure of polar scientific research personnel, the existing technical teams are basically focusing on tackling the key technologies of polar multi-parameter monitoring and integrated monitoring systems, focusing on polar environment micro-nano sensing monitoring systems, and conducting research on the mechanisms affecting sensor reliability and stability. Solve the structural design and packaging process of high-cold-resistant sensors to meet the long-term operation requirements in low-temperature environments.

[0003] In the current technological development scenario, data monitored by micro-nano sensors and other sensor systems are particularly important, providing a basis for data analysis for scientific research teams. However, the accuracy of sensor system data is often easily overlooked. Due to the lack of monitoring devices for DC power supply equipment, whether the power supply of equipment in polar environments is normal is the most important link to avoid errors in data monitoring. Therefore, there is an urgent need for a technical solution that can monitor the power supply parameters of DC equipment under harsh polar environmental conditions. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a DC equipment power supply monitoring system for use in polar environments. The invention is mainly used in polar environments to monitor the power supply status of DC equipment in real time and realize long-distance transmission and display of monitoring data, provide accurate power supply parameters for subsequent DC equipment fault detection, and improve the reliability of DC equipment detection.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A DC equipment power supply monitoring system for polar environments, the DC equipment power supply monitoring system is connected between a DC power supply to be tested and a DC device, and comprises a DC power supply access circuit, a voltage acquisition circuit, a current acquisition circuit and a voltage mutation pulse detection circuit, wherein: a signal input end of the voltage acquisition circuit and a signal input end of the current acquisition circuit are connected to the DC power supply to be tested through the DC power supply access circuit, a signal output end of the voltage acquisition circuit and a signal output end of the current acquisition circuit are respectively connected to a first signal input end and a second signal input end of a signal operation processor, a first signal output end of the signal operation processor is connected to a wireless transmission system, and a second signal output end is connected to a display system;

[0007] The voltage mutation pulse acquisition circuit records the voltage change of the pulse mutation of the DC power supply under test during the power supply period, and obtains the change of the effective value of the mutation pulse voltage by integrating the mutation pulse over time.

[0008] Furthermore, the DC power supply access circuit is provided with an external power supply connected to the positive pole A+IN and an internal circuit power supply connected to the positive pole A+IN_1, as well as a common terminal -COM and an anti-reverse connection protection circuit for connecting the external power supply and the external device to the negative pole. A bidirectional voltage regulator diode D5, a varistor R71 and a varistor R69 and a varistor R70 connected in series are connected in parallel between the external power supply connected to the positive pole A+IN and the common terminal -COM, and the varistor R69 and the varistor R70 are connected to the earth EARTH; the first bridge arm of the bridge circuit composed of diodes D1, D2, D3 and D4 is connected to the external power supply connected to the positive pole A+IN through a fuse F1, the second bridge arm is grounded GND, the third bridge arm is connected to the common terminal -COM, and the fourth bridge arm is connected to the internal circuit power supply positive pole A+IN_1.

[0009] Furthermore, the current acquisition circuit detects the voltage drop of the shunt resistor within a wide common-mode voltage range. The positive input terminal of the current acquisition circuit is connected to the internal circuit power supply positive electrode A+IN_1, and the positive input terminal and the reverse input terminal are connected through the shunt resistor R67. The reverse input terminal is used as the internal circuit detection power supply positive electrode A+IN_2 to connect to the signal input terminal of the voltage acquisition circuit to realize voltage acquisition. At the same time, the internal circuit detection power supply positive electrode A+IN_2 is connected to the external device power supply positive electrode A+OUT and supplies power to the voltage conversion circuit; the output terminal of the current acquisition circuit is the current sampling signal ADC_V2, and the current sampling signal ADC_V2 is connected to the second signal input terminal of the signal operation processor.

[0010] Furthermore, the shunt resistor R67 is in the order of milliohms.

[0011] Furthermore, the voltage acquisition circuit acquires the real-time DC voltage value of the monitored DC power supply device. The signal input end of the voltage acquisition circuit completes voltage sampling through the sampling resistor R1 and the sampling resistor R2 connected in series. The sampling resistor R2 is grounded GND. The sampling point is set between the sampling resistor R1 and the sampling resistor R2. The sampling point signal T_V1 is transmitted to the input end of the high input impedance operational amplifier circuit. The output end is the voltage sampling signal ADC1. The voltage sampling signal ADC1 is connected to the first signal input end of the signal operation processor.

[0012] Furthermore, the ratio of the sampling resistor R1 to the sampling resistor R2 is in the range of 1:3 to 1:5.

[0013] Furthermore, the voltage mutation pulse acquisition circuit includes an AC signal demodulation and small signal amplification circuit and a true root mean square DC conversion circuit. The signal input end of the voltage mutation pulse acquisition circuit is the input end of the AC signal demodulation and small signal amplification circuit. The input end of the AC signal demodulation and small signal amplification circuit is connected to the sampling point of the voltage acquisition circuit, and the output end is connected to the input end T_V1 of the true root mean square DC conversion circuit. The AC signal demodulation and small signal amplification circuit demodulates the AC signal in the DC input signal and amplifies the AC small signal.

[0014] The output end of the true root mean square to direct current conversion circuit is connected to the third signal input end of the signal operation processor. The true root mean square to direct current conversion circuit converts the AC signal into a DC signal effective value and analyzes the effective value change of the interference signal.

[0015] In summary, the invention has the following beneficial effects:

[0016] The present invention is used in a low-temperature environment of the polar regions. By connecting a DC device power supply monitoring system between a DC power supply device and a DC power-consuming device as a DC power source, the voltage and current parameters of the DC power supply device in the polar outdoor environment are monitored in real time and displayed intuitively. At the same time, a wireless transmission system is used to transmit the monitored signal of the DC power supply device to a host computer and a server. The voltage operation curve can be clearly drawn at the server terminal, and the interference signal loaded on the DC power supply can be displayed, and the effective value of the interference signal can be displayed through a curve. The present invention can also realize long-distance wireless transmission of signals, provide overvoltage alarm and overcurrent alarm, provide accurate power supply parameters for subsequent DC device fault detection, and improve the reliability of DC device detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the DC equipment power supply monitoring system of the present invention;

[0018] Figure 2 This is a schematic diagram of the external wiring terminals of the DC power supply access circuit of the present invention;

[0019] Figure 3 A circuit schematic diagram of a DC power supply access circuit of the present invention;

[0020] Figure 4 It is a framework diagram of the voltage acquisition circuit of the present invention;

[0021] Figure 5 It is a circuit principle diagram of the voltage acquisition circuit of the present invention;

[0022] Figure 6 It is a framework diagram of the voltage mutation pulse acquisition circuit of the present invention;

[0023] Figure 7 It is a circuit schematic diagram of the AC signal demodulation and small signal amplification circuit of the present invention;

[0024] Figure 8 is a circuit schematic diagram of a true RMS DC conversion circuit of the present invention;

[0025] Fig. 9 is a circuit schematic diagram of the current acquisition circuit of the present invention;

[0026] Fig.10 This is the schematic diagram of the wireless transmission circuit;

[0027] Fig.11 It is the schematic diagram of the voltage conversion circuit;

[0028] Fig.12 It is the circuit schematic diagram of the signal operation processor;

[0029] Fig.13 This is the circuit for the display part. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] It should be noted that, for the sake of convenience, the directions described below are consistent with the directions of the drawings themselves, but do not limit the structure of the present invention.

[0032] like Figures 1 to 13As shown, the present invention discloses a DC equipment power supply monitoring system for polar environment. In the polar low temperature environment, the DC equipment power supply monitoring system is connected between the DC power supply to be tested and the DC equipment, and includes a DC power supply access circuit, a voltage acquisition circuit, a current acquisition circuit and a voltage mutation pulse detection circuit, wherein: the signal input end of the voltage acquisition circuit and the signal input end of the current acquisition circuit are connected to the DC power supply to be tested through the DC power supply access circuit, the signal output end of the voltage acquisition circuit and the signal output end of the current acquisition circuit are respectively connected to the first signal input end and the second signal input end of the signal operation processor, the first signal output end of the signal operation processor is connected to the wireless transmission system, and the second signal output end is connected to the display system, and the wireless transmission system transmits the power supply parameters of the DC power supply running equipment in the polar low temperature environment to the data cloud or service station in real time; the present invention is applied to the polar environment, and in order to save polar electric energy, the display system is used to display the physical parameters of the DC power supply to be tested, in Fig.13 In the illustrated embodiment, two LEDs are provided to respectively display the voltage and current of the DC power supply under test. Overvoltage indicates that the voltage of the DC power supply under test is too high and exceeds a threshold value; overcurrent indicates that the current of the DC power supply under test is too high and exceeds a threshold value. Fig.12 The circuit schematic diagram of the signal operation processor. In this embodiment, the signal operation processor uses STC8G1K08-38I-TSSOP20, which is used to process voltage signals and current signals, record the voltage signals and current signals and transmit them to the server through LoRa wireless. The server terminal uses professional software to export the data and draw a curve for subsequent data reliability analysis and equipment fault troubleshooting.

[0033] like Figure 2 As shown, the DC power supply access circuit is provided with an external power supply connected to the positive pole A+IN and an internal circuit power supply connected to the positive pole A+IN_1, as well as a common terminal -COM for connecting the external power supply and the external device to the negative pole and an anti-reverse connection protection circuit. A bidirectional voltage regulator diode D5, a varistor R71, and a varistor R69 and a varistor R70 in series are connected in parallel between the external power supply connected to the positive pole A+IN and the common terminal -COM, and the varistor R69 and the varistor R70 are connected to the earth EARTH; the first bridge arm of the bridge circuit composed of diodes D1, D2, D3 and D4 is connected to the external power supply connected to the positive pole A+IN through a fuse F1, the second bridge arm is connected to the ground GND, the third bridge arm is connected to the common terminal -COM, and the fourth bridge arm is connected to the internal circuit power supply positive pole A+IN_1. The DC power supply access circuit has an external DC positive and reverse connection protection mechanism, and is equipped with a fast self-recovery fuse and an electrostatic surge protection chip.

[0034] like Fig. 9As shown, the current acquisition circuit detects the voltage drop of the shunt resistor within a wide common-mode voltage range. The positive input end of the current acquisition circuit is connected to the positive pole of the internal circuit power supply A+IN_1. The positive input end and the reverse input end are connected through the shunt resistor R67. The order of magnitude of the shunt resistor R67 is in the milliohm level. The reverse input end is used as the positive pole of the internal circuit detection power supply A+IN_2 to connect the signal input end of the voltage acquisition circuit to realize voltage acquisition. At the same time, the positive pole of the internal circuit detection power supply A+IN_2 is connected to the positive pole of the external device power supply A+OUT, and supplies power to the voltage conversion circuit; the output end of the current acquisition circuit is the current sampling signal ADC_V2, and the current sampling signal ADC_V2 is connected to the second signal input end of the signal operation processor. In this embodiment, the INA240 device is selected as a voltage output and current detection amplifier, which has an enhanced PWM suppression function and can detect the voltage drop on the shunt resistor within a wide common-mode voltage range of -4V to 80V independent of the power supply voltage. The operating voltage allowed by the negative common-mode voltage is lower than the ground voltage, thereby adapting to the flyback cycle of typical solenoid applications. Enhanced PWM rejection provides a high level of rejection of large common-mode transients (ΔV / Δt) in systems using pulse-width modulated (PWM) signals, such as motor drives and solenoid control systems. This enables accurate current measurement without causing large transients in the output voltage and the corresponding recovery ripple.

[0035] like Figure 4 and Figure 5 As shown, the voltage acquisition circuit acquires the real-time DC voltage value of the monitored DC power supply device. The signal input end of the voltage acquisition circuit completes voltage sampling through the sampling resistor R1 and the sampling resistor R2 connected in series. The sampling resistor R2 is grounded GND. The sampling point is set between the sampling resistor R1 and the sampling resistor R2. The ratio range of the sampling resistor R1 and the sampling resistor R2 is 1:3 to 1:5. The sampling point signal T_V1 is transmitted to the input end of the high input impedance operational amplifier circuit, and the output end is the voltage sampling signal ADC1. The voltage sampling signal ADC1 is connected to the first signal input end of the signal operation processor.

[0036] like Figure 6 to Figure 8 As shown, the voltage mutation pulse acquisition circuit records the voltage change of the pulse mutation of the DC power supply under test during the power supply period, and obtains the change of the effective value of the mutation pulse voltage by integrating the mutation pulse over time. The voltage mutation pulse acquisition circuit includes an AC signal demodulation and small signal amplification circuit and a true root mean square DC conversion circuit. The signal input end of the voltage mutation pulse acquisition circuit is the input end of the AC signal demodulation and small signal amplification circuit. The input end of the AC signal demodulation and small signal amplification circuit is connected to the sampling point of the voltage acquisition circuit, and the output end is connected to the input end T_V1 of the true root mean square DC conversion circuit. The AC signal demodulation and small signal amplification circuit demodulates the AC signal in the DC input signal and amplifies the AC small signal.

[0037] The output end of the true root mean square to direct current conversion circuit is connected to the third signal input end of the signal operation processor. The true root mean square to direct current conversion circuit converts the AC signal into the effective value of the DC signal and analyzes the effective value change of the interference signal.

[0038] like Figure 10 to Figure 12 The figure shows the connection method of the wireless transmission system, voltage conversion circuit and display system. The wireless transmission system adopts long-distance and low-power LoRa communication to connect the IoT edge device to the server / cloud network gateway, so that users can continuously collect and analyze data. In this embodiment, the Anxinke RA-01LoRa series is selected, which takes into account distance, anti-interference and power consumption, has a long transmission distance and high reliability.

[0039] exist Fig.11 In the illustrated embodiment, the voltage conversion circuit uses a switching power supply chip MC34063.

[0040] Figure 1 The curve diagram in is only a schematic diagram and does not represent the signal collected by the present invention.

[0041] The present invention can analyze the change of the effective value of the sudden pulse voltage by integrating the sudden pulse over time, so as to prepare for the subsequent upgrading and transformation of the equipment. The effective value of the sudden pulse voltage is calculated using the following formula:

[0042]

[0043] Among them, U is the effective value of the sudden pulse, T is a period, u(t) is the change curve function of the sudden pulse, and t is the time variable.

[0044] The present invention uses the following formula to calculate the instantaneous power and average power of the DC power supply device under test:

[0045] p(t) = u(t)*i(t) (2)

[0046]

[0047] Among them, p(t) represents instantaneous power, u(t) represents instantaneous voltage, i(t) represents instantaneous current, P(t) is average power, and T is the operating time of the monitored equipment.

[0048] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A DC equipment power supply monitoring system for polar environments, characterized in that: The DC device power supply monitoring system is connected between the DC power supply under test and the DC device, and includes a DC power supply access circuit, a voltage acquisition circuit, a current acquisition circuit, and a voltage mutation pulse detection circuit, wherein: the signal input end of the voltage acquisition circuit and the signal input end of the current acquisition circuit are connected to the DC power supply under test through the DC power supply access circuit, the signal output end of the voltage acquisition circuit and the signal output end of the current acquisition circuit are respectively connected to the first signal input end and the second signal input end of the signal operation processor, the first signal output end of the signal operation processor is connected to the wireless transmission system, and the second signal output end is connected to the display system; The voltage mutation pulse acquisition circuit records the voltage change of the pulse mutation of the DC power supply under test during the power supply period, and obtains the change of the effective value of the mutation pulse voltage by integrating the mutation pulse over time.

2. The DC equipment power supply monitoring system for polar environment according to claim 1, characterized in that: The DC power supply access circuit is provided with an external power supply connected to a positive pole A+IN and an internal circuit power supply connected to a positive pole A+IN_1, as well as a common terminal -COM and an anti-reverse connection protection circuit for connecting the external power supply and the external device to the negative pole. A bidirectional voltage regulator diode D5, a varistor R71 and a varistor R69 and a varistor R70 connected in series are connected in parallel between the external power supply connected to the positive pole A+IN and the common terminal -COM, and the varistor R69 and the varistor R70 are connected to the earth EARTH; the first bridge arm of the bridge circuit composed of diodes D1, D2, D3 and D4 is connected to the external power supply connected to the positive pole A+IN through a fuse F1, the second bridge arm is grounded GND, the third bridge arm is connected to the common terminal -COM, and the fourth bridge arm is connected to the internal circuit power supply positive pole A+IN_1.

3. The DC equipment power supply monitoring system for polar environments according to claim 2, characterized in that: The current acquisition circuit detects the voltage drop of the shunt resistor within a wide common-mode voltage range. The positive input end of the current acquisition circuit is connected to the positive electrode A+IN_1 of the internal circuit power supply. The positive input end and the reverse input end are connected through the shunt resistor R67. The reverse input end is used as the positive electrode A+IN_2 of the internal circuit detection power supply to connect to the signal input end of the voltage acquisition circuit to realize voltage acquisition. At the same time, the positive electrode A+IN_2 of the internal circuit detection power supply is connected to the positive electrode A+OUT of the external device power supply and supplies power to the voltage conversion circuit. The output end of the current acquisition circuit is the current sampling signal ADC_V2, and the current sampling signal ADC_V2 is connected to the second signal input end of the signal operation processor.

4. The DC equipment power supply monitoring system for polar environments according to claim 3 is characterized in that: The order of magnitude of the shunt resistor R67 is in the milliohm level.

5. The DC equipment power supply monitoring system for polar environments according to claim 3 is characterized in that: The voltage acquisition circuit acquires the real-time DC voltage value of the monitored DC power supply device. The signal input end of the voltage acquisition circuit completes voltage sampling through a sampling resistor R1 and a sampling resistor R2 connected in series. The sampling resistor R2 is grounded GND. The sampling point is set between the sampling resistor R1 and the sampling resistor R2. The sampling point signal T_V1 is transmitted to the input end of the high input impedance operational amplifier circuit. The output end is the voltage sampling signal ADC1. The voltage sampling signal ADC1 is connected to the first signal input end of the signal operation processor.

6. The DC equipment power supply monitoring system for polar environments according to claim 5, characterized in that: The ratio of the sampling resistor R1 to the sampling resistor R2 is in the range of 1:3 to 1:

5.

7. The DC equipment power supply monitoring system for polar environments according to claim 3, characterized in that: The voltage mutation pulse acquisition circuit includes an AC signal demodulation and small signal amplification circuit and a true root mean square DC conversion circuit. The signal input end of the voltage mutation pulse acquisition circuit is the input end of the AC signal demodulation and small signal amplification circuit. The input end of the AC signal demodulation and small signal amplification circuit is connected to the sampling point of the voltage acquisition circuit, and the output end is connected to the input end T_V1 of the true root mean square DC conversion circuit. The AC signal demodulation and small signal amplification circuit demodulates the AC signal in the DC input signal and amplifies the AC small signal. The output end of the true root mean square to direct current conversion circuit is connected to the third signal input end of the signal operation processor. The true root mean square to direct current conversion circuit converts the AC signal into a DC signal effective value and analyzes the effective value change of the interference signal.

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