Low-power-consumption water quality monitor

Abstract

The utility model discloses a low-power-consumption water quality monitor which comprises a central processing unit, a power supply module connected with the central processing unit, a power supply management module connected with the central processing unit and used for controlling the on-off relation between the power supply module and the central processing unit, and an RTC module connected with the central processing unit, the monitoring module and the wireless communication module are connected with the power module, the first standby module and the second standby module are connected with the central processing unit, the first standby module is used for controlling connection and disconnection of the monitoring module and the power module, and the second standby module is used for controlling connection and disconnection of the power module and the wireless communication module; the power supply module comprises a USB external module, a solar module and an alternating current power supply module; and the power management module is used for switching on and off of a plurality of power modules in the power module. According to the utility model, the power consumption of the water quality monitor can be effectively reduced, and the cruising ability of the water quality monitor is prolonged, so that the water quality monitor can monitor a water body for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of water quality monitors, and particularly relates to a low-power water quality monitor. Background Art

[0002] In water quality monitoring work, it is necessary to sample and analyze water body samples at the target location, so as to evaluate the water quality of the target location. In order to facilitate more accurate monitoring of water sources, water quality monitors are often used.

[0003] Existing water quality monitors rely on 220V AC power. Although this power supply design is relatively convenient to use in urban areas, industrial areas and other regions, in remote areas, the wild, nature reserves and other scenarios, due to the lack of power grid coverage in remote areas or the wild, although the water quality monitor can work normally by connecting an external mobile power supply, the power of the mobile power supply is limited and cannot enable the water quality monitor to carry out long-term and stable monitoring work. Therefore, the water quality monitor cannot be flexibly deployed according to requirements and cannot conduct long-term monitoring of water resources in remote areas, the wild and nature reserves.

[0004] Therefore, it is an urgent technical problem to provide a water quality monitor with low power consumption, long battery life and capable of long-term monitoring of water quality. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a low-power water quality monitor to solve the problems that the existing water quality monitor in the background art cannot be flexibly deployed and has a short battery life when used outdoors, resulting in the inability of the water quality monitor to conduct long-term and stable monitoring of water quality.

[0006] To achieve the above purpose, the utility model provides a low-power water quality monitor, which includes a central processor, a power supply module connected to the central processor, a power management module connected to the central processor and used to control the on-off relationship between the power supply module and the central processor, an RTC module connected to the central processor, a monitoring module and a wireless communication module connected to the power supply module, a first standby module and a second standby module connected to the central processor. The first standby module is used to control the on-off of the monitoring module and the power supply module, and the second standby module is used to control the on-off of the power supply module and the wireless communication module; the power supply module includes a USB external module, a solar module and an AC power module; the power management module is used to switch the on-off of multiple power modules in the power supply module.

[0007] Optionally, the power management module includes a first control switch, a second control switch, a third control switch, a DC current sensor and an AC current sensor connected to the central processor.

[0008] Optionally, the first control switch is connected to the USB external module; the second control switch is connected to the solar module; the third control switch is connected to the AC power module; the DC current sensor is disposed between the solar module and the second control switch; the AC current sensor is disposed between the third control switch and the AC power module.

[0009] Optionally, the USB external module includes a USB interface, a boost converter connected to the USB interface, and the first control switch is located between the USB interface and the boost converter.

[0010] Optionally, both the solar module and the AC power module are connected with a buck-boost converter; the solar module includes a photovoltaic module, a battery pack connected to the photovoltaic module, the battery pack is connected to the DC current sensor, and the output end of the battery pack is connected to the buck-boost converter; the second control switch is located between the battery pack and the buck-boost converter; a charge controller is provided between the photovoltaic module and the battery pack.

[0011] Optionally, the AC power module includes an AC interface, a rectifier connected to the AC interface, the output end of the rectifier is connected to the buck-boost converter, the third control switch is located between the rectifier and the buck-boost converter, and the AC current sensor is located between the AC interface and the rectifier.

[0012] Optionally, two lines are provided at the output end of the power module, and an inverter is provided on one of the lines.

[0013] Optionally, the monitoring module includes a pH sensor, a temperature sensor, a turbidity sensor, a dissolved oxygen sensor, and a conductivity sensor connected to the central processor and the power module; the first standby module is located between the power module and the monitoring module.

[0014] Optionally, the wireless communication module includes an antenna, a radio frequency front end bidirectionally connected to the antenna, an intermediate frequency amplifier connected to the radio frequency front end, a modulator-demodulator connected to the intermediate frequency amplifier and the radio frequency front end, and the modulator-demodulator is also connected to the central processor; the second standby module is provided between the wireless communication module and the second standby module.

[0015] Optionally, the first standby module includes a plurality of first standby switches connected to the central processor, the number of the plurality of first standby switches is equal to the number of sensors of the monitoring module, and the first standby switches are arranged on branches corresponding to the sensors one by one for controlling the on-off between each sensor and the power module.

[0016] Optionally, the second standby module includes a plurality of second standby switches connected to the central processing unit, and the plurality of second standby switches are respectively used to control the on / off between the radio frequency front end, the intermediate frequency amplifier, the modulator / demodulator and the power supply module.

[0017] Compared with the prior art, the present utility model provides a low-power water quality monitor, which has the following beneficial effects:

[0018] With the setting of the power supply module in this low-power water quality monitor, the staff can supply power through the AC power module using a conventional 220V AC power supply, can supply power through the USB external module using an external mobile power supply, or can convert solar energy into electrical energy through the solar module for power supply. Multiple power supply methods facilitate the deployment of the staff in remote areas, the wild, nature reserves and the water quality monitor in Xining. Moreover, the conversion of solar energy into electrical energy by the solar module belongs to renewable energy, enabling the power in the power supply module to be regenerated, thereby improving the battery life of the water quality monitor.

[0019] In addition, through the setting of the RTC module, a timing function is provided. In combination with the settings of the first standby module and the second standby module, the circuits of the power supply module and the monitoring module are closed regularly, and the circuits of the wireless communication module and the power supply module are closed regularly to monitor the water quality regularly and send the water quality information regularly. The power supply module is disconnected from the monitoring module and the wireless communication module at other times, thereby reducing the power consumption of the water quality monitor and extending the battery life of the water quality monitor, enabling the water quality monitor to monitor the water body for a long time. Description of the Drawings

[0020] Figure 1 is the module block diagram of the whole of the present utility model.

[0021] Figure 2 is the module block diagram between the multiple power supply modules, the power management module and the processor of the present utility model.

[0022] Figure 3 is the module block diagram of the wireless transceiver module and the processor of the present utility model.

[0023] Figure 4 is the module block diagram of the processor and the monitoring module of the present utility model.

[0024] Figure 5 is the circuit structure schematic diagram of the boost converter of the present utility model.

[0025] Figure 6 is the circuit structure schematic diagram of the charging controller of the present utility model.

[0026] Figure 7 is the circuit structure schematic diagram of the buck-boost converter of the present utility model.

[0027] Figure 8 It is the switch diagram inside the chip in the buck-boost converter of the present utility model.

[0028] Figure 9 It is the schematic circuit structure diagram of the inverter of the present utility model.

[0029] Figure 10 It is the flowchart of the cyclic detection of the standby module of the present utility model.

[0030] Identifications in the figure: 1. Central processing unit; 2. Power supply module; 21. USB external module; 211. USB interface; 212. Boost converter; 22. Solar module; 221. Photovoltaic module; 222. Battery pack; 23. AC power supply module; 231. AC interface; 24. Buck-boost converter; 25. Inverter; 232. Rectifier; 3. Power management module; 31. First control switch; 32. Second control switch; 33. Third control switch; 34. DC current sensor; 35. AC current sensor; 4. RTC module; 5. Monitoring module; 51. pH sensor; 52. Temperature sensor; 53. Turbidity sensor; 54. Dissolved oxygen sensor; 55. Conductivity sensor; 6. Wireless communication module; 61. Antenna; 62. RF front end; 63. Intermediate frequency amplifier; 64. Modulator-demodulator; 7. First standby module; 71. First standby switch; 8. Second standby module; 81. Second standby switch. Detailed implementation manners

[0031] The following is a detailed description in combination with the accompanying drawings and specific implementations. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0032] A low-power water quality monitor of the present application can be applicable to occasions with poor power grid coverage such as remote areas, the wild, nature reserves, etc. Of course, it can also be used in other similar application scenarios. A low-power water quality monitor will be described in detail below.

[0033] Refer to the attached Figure 1 — Figure 10As shown in the figure, it shows a schematic structural diagram of a preferred embodiment of a low-power water quality monitor of the present application. The low-power water quality monitor includes a central processor 1, a power supply module 2 connected to the central processor 1, a power management module 3 connected to the central processor 1 and used to control the on / off relationship between the power supply module 2 and the central processor 1, an RTC module 4 connected to the central processor 1, a monitoring module 5 and a wireless communication module 6 connected to the power supply module 2, a first standby module 7 and a second standby module 8 connected to the central processor 1. The first standby module 7 is used to control the on / off between the monitoring module 5 and the power supply module 2, and the second standby module 8 is used to control the on / off between the power supply module 2 and the wireless communication module 6; the power management module 3 is used to switch the on / off of multiple modules in the power supply module 2.

[0034] Through the setting of the power supply module 2 of the present utility model, power is provided for the water quality monitor to ensure the normal operation of the water quality monitor. At the same time, the power supply module 2 is provided with a USB external module 21, a solar module 22 and an AC power module 23, so that the water quality monitor can use the AC power module 23 according to actual needs, that is, connect to an external 220V AC power supply for power supply, or in deployment locations with small power grid coverage such as remote areas, the wild, and nature reserves where 220V AC power cannot be used, power supply can be carried out through the solar module 22 and the USB external module 21. And because the solar module 22 converts solar energy into electrical energy, and solar energy belongs to renewable energy, it is possible to regenerate electrical energy and extend the battery life of the water quality monitor; through the setting of the power management module 3, the USB external module 21, the solar module 22 and the AC power module 23 can be automatically switched according to the actual situation; through the setting of the RTC module 4, accurate time information and an alarm function are provided, so that the central processor 1 can periodically turn on and off the monitoring module 5 and the wireless communication module 6 through the first standby module 7 and the second standby module 8, avoiding the long-term operation power consumption of the monitoring module 5 and the wireless communication module 6, thereby reducing the power consumption of the water quality monitor and increasing the battery life of the water quality monitor, so that the water quality monitor can operate stably for a long time; through the setting of the monitoring module 5, the water quality can be monitored, providing important data materials for the prevention and treatment of water pollution; through the setting of the wireless communication module 6, the monitored data can be remotely transmitted; it should be particularly noted that the central processor 1 can be a PLC controller or a single-chip microcomputer.

[0035] Refer to the appendix Figure 1 and Figure 2As shown, in the present utility model, the power management module 3 includes a first control switch 31, a second control switch 32, a third control switch 33, a DC current sensor 34, and an AC current sensor 35 that are connected to the central processing unit 1; among them, the first control switch 31 is connected to the USB external module 21; the second control switch 32 is connected to the solar module 22; the third control switch 33 is connected to the AC power module 23; the DC current sensor 34 is arranged between the solar module 22 and the second control switch 32; the AC current sensor 35 is arranged between the third control switch 33 and the AC power module 23.

[0036] Through the settings of the first control switch 31, the second control switch 32, and the third control switch 33 in the present utility model, the USB external module 21, the solar module 22, and the AC power module 23 can be respectively controlled, and each power module can be controlled individually, so that when one power module supplies power, the other power modules can be powered off, avoiding the situation of multiple power supplies supplying power simultaneously; through the setting of the DC current sensor 34, it is used to monitor the electric energy of the solar module 22. When the AC power module 23 is not connected, when the USB external module 21 is used for power supply, the DC current sensor 34 sends the current of the solar module 22 to the central processing unit 1. After the central processing unit 1 compares it with the set current and ensures that the current of the solar module 22 is sufficient for the water quality monitor to use, the central processing unit 1 will disconnect the first control switch 31 and simultaneously close the second control switch 32 to switch to the solar module 22 for power supply; the DC current sensor 34 is arranged between the second control switch 32 and the solar module 22 to ensure that the current of the solar module 22 can always be in contact with the DC current sensor 34, ensuring that when the current of the solar module 22 is sufficient, it can be monitored immediately; through the setting of the AC current sensor 35, the 220V AC power supply can be monitored. When the AC power module 23 is connected to the AC power supply, it can be monitored, so that the central processing unit 1 can receive the signal and control the third control switch 33 to close, and the other two control switches to disconnect, ensuring that only one power module is supplying power; by arranging the AC current sensor 35 between the third control switch 33 and the AC power module 23, it is ensured that when the AC power module 23 is connected to the 220V AC voltage, it can be monitored; it should be particularly noted that the 220V AC voltage is the conventional voltage; the opening and closing speeds of the three control switches are in milliseconds, and when switching the power module, it will not cause the central processing unit 1 to lose power.

[0037] Refer to the appendix Figure 1 、 Figure 2 and Figure 5As shown, in the present utility model, the USB external module 21 includes a USB interface 211, a boost converter 212 connected to the USB interface 211, and a first control switch 31 located between the USB interface 211 and the boost converter 212.

[0038] Through the setting of the USB interface 211 in the present utility model, necessary conditions are provided for an external mobile power supply, and the water quality monitor can perform data transmission in the form of USB connection; through the setting of the boost converter 212, the voltage provided by the external mobile power supply is boosted to ensure the normal use of the central processing unit 1, the monitoring module 5, and the wireless communication module 6.

[0039] It should be particularly noted that Figure 5 The working principle of the circuit of the boost converter 212 in [] is the same as that of the existing boost circuit. Its main circuit chip is the existing SDB628, which can control the current to charge and discharge the inductor, thereby boosting the voltage; simply put, when the switch control pin of the SDB628 controls the switch to close, the inductor is charged, and the capacitor supplies power to the load to maintain the output voltage. When the switch control pin controls the switch to open, the inductor will discharge current due to its own characteristics and supply power to the capacitor and the load. The current of the capacitor and the current of the inductor cooperate to increase the voltage at the output end. The SDB628 chip is a boost converter chip widely used in the field of power management. The input voltage range of this chip can be from a minimum of 2 volts to a maximum of 24 volts, and the boost can reach up to 28 volts and is adjustable. It also integrates a MOSFET (metal-oxide-semiconductor field-effect transistor) with an internal RDS internal resistance of 100 milliohms. The maximum output current can reach 2A, the operating frequency is 1.2MHZ, and the conversion efficiency is as high as 95%. At the same time, this circuit has functions such as short-circuit protection and overheat protection. This principle belongs to the existing boost principle, so it will not be elaborated here.

[0040] Participate in the appendix Figure 1 、 Figure 2 、 Figure 6 and Figure 7 As shown in [], [], [], and [], in the present utility model, both the solar module 22 and the AC power module 23 are connected to a buck-boost converter 24; the solar module 22 includes a photovoltaic module 221, a battery pack 222 connected to the photovoltaic module 221. The battery pack 222 is connected to a DC current sensor 34, and the output end of the battery pack 222 is connected to the buck-boost converter 24; a second control switch 32 is located between the battery pack 222 and the buck-boost converter 24. It should be particularly noted that a charge controller 223 is provided between the photovoltaic module 221 and the battery pack 222.

[0041] Refer to the appendix Figure 6 As shown, the working principle of the charge controller 223 in this application is as follows:

[0042] When the photovoltaic module 221 is irradiated by sunlight, a DC voltage is generated and stored in the battery pack 222. The charging controller 223 monitors the voltage and current of the battery pack 222 in real time through the internal voltage and current detection circuits, and is managed by the control chip CN3791.

[0043] Specifically, CN3791 is a PWM buck-mode single-cell lithium battery charging management integrated circuit powered by a solar panel. It has trickle, constant current, and constant voltage charging modes. When the voltage of the battery pack 222 is lower than the set value, CN3791 enters the constant current charging mode, sets the charging current through the circuit resistance, and provides a constant charging current for rapid charging. When the battery voltage gradually rises and approaches the set cut-off voltage (the constant voltage charging voltage is 4.2V ± 1%), the charging controller 223 gradually reduces the charging current and switches to the constant voltage charging mode to ensure that the battery pack is not overcharged. For deeply discharged lithium batteries, when the battery voltage is lower than 66.5% (typical value) of the constant voltage charging voltage, CN3791 performs trickle charging at 17.5% of the constant current charging current. During the constant voltage charging stage, the charging current gradually decreases, and when the charging current drops to 16% of the constant current charging current, the charging ends. If, in the charging end state, the battery voltage drops to 95.5% of the constant voltage charging voltage, CN3791 automatically starts a new charging cycle.

[0044] In addition, CN3791 also has multiple protection functions, including input low voltage lockout, overvoltage protection, and charging status indication, etc. When an abnormal situation is detected (such as a power failure of the input power supply or the input voltage is lower than the battery voltage), CN3791 automatically enters the sleep mode to protect the safety of the battery pack and the entire circuit. This charging controller 223 belongs to the prior art and is briefly described here for easy understanding of the charging controller 223.

[0045] The present utility model is provided with a buck-boost converter 24 for performing buck-boost processing on a solar module 22 and an AC power module 23. Here, a boost converter and a buck converter are adopted because the voltage changes of the solar module 22 and the AC power module 23 are too large, and the power sources of the solar module 22 and the AC power module 23 have stronger endurance capabilities compared to the USB external module 21. Specifically, the AC power module 23 can be connected to the power grid to continuously supply electric energy, the solar module 22 can be regenerated through solar energy, while the USB external module 21 can only be manually replaced by the staff. Therefore, in order to reduce costs, a buck-boost converter 24 is adopted here; through the setting of the photovoltaic module 221, solar energy can be converted into electric energy and stored; through the setting of the battery pack 222, the electric energy converted from solar energy is stored to prevent the water quality monitor from losing power when there is insufficient sunlight or no sunlight, such as at sunset or on rainy days; through the setting of the second control switch 32, the buck-boost converter 24 is protected from long-term operation.

[0046] Refer to Figure 7 and Figure 8 As shown, the working process of the buck-boost converter 24 is as follows:

[0047] When the input voltage is significantly greater than the output voltage, this means that the converter can supply energy to the load at the maximum duty cycle of switch A. Therefore, the converter operates in buck mode. The control signal VC-Boost is always lower than the compensation ramp because Buck can supply sufficient energy to the load. Thus, switch D is always on and switch C remains off. Meanwhile, VC-Buck is compared with the compensation ramp normally to generate a PWM signal. Therefore, switches A and B are pulse-width modulated to generate the required duty cycle to support the output voltage. When the input voltage approaches the output voltage, due to the duty cycle limitation of switch A, the converter cannot supply the required energy to the load. In this case, switch A will be on throughout the period, that is, no operation is performed on B and D (switches B and D are on simultaneously). Subsequently, a new period begins. Since there was no B and D in the previous cycle, an offset voltage is added to the ramp signal to make it easier for the ramp signal to reach VC-Buck. At the same time, due to loop regulation, VC-Boost (and VC-Buck) rises to a certain level such that the ramp signal can intersect with it to generate a PWM drive signal for Boost operation. After switch C turns off, the ramp signal continues to rise (the actual inductor current may rise or fall, depending on the difference between the input voltage and the output voltage). When the ramp intersects with VC-Buck, a PWM signal for Buck operation is generated. Now the duty cycle of buck is within its limit range, so there are operations on B and D in the current cycle, which means the offset voltage for the next cycle will be removed. This is the so-called buck-boost region. Due to the voltage drop across the switches causing an overloaded load, the actual input range of this region may be a bit wide. When the input voltage is significantly lower than the output voltage, the converter operates in boost mode. Even though the offset voltage is always added, the control signal VC-Buck is always higher than the compensation ramp. Therefore, switch A remains closed and switch B remains off. Meanwhile, VC-Boost compares with the compensation ramp normally to generate a PWM signal. Therefore, switches C and D are pulse-width modulated to generate the required duty cycle to support the output regulated voltage. This buck-boost converter 24 belongs to the prior art. This application only briefly describes the working process and achieved functions of the buck-boost converter 24 without improving the existing buck-boost converter 24.

[0048] Participate in the appendix Figure 1 and Figure 2 As shown, in the present utility model, the AC power supply module 23 includes an AC interface 231, a rectifier 232 connected to the AC interface 231. The output end of the rectifier 232 is connected to the buck-boost converter 24. The third control switch 33 is located between the rectifier 232 and the buck-boost converter 24, and the AC current sensor 35 is located between the AC interface 231 and the rectifier 232.

[0049] The present utility model provides a connection port for a 220V AC power supply through the setting of the AC interface 231; through the setting of the position of the third control switch 33, the rectifier 232 is protected from working for a long time, the service life of the rectifier 232 is extended, and it is ensured that the AC current sensor 35 can sense the AC power supply.

[0050] Refer to the appendix Figure 1 and Figure 9 It should be particularly noted that there are two lines at the output end of the power supply module 2, and an inverter 25 is provided on one of the lines. Through the setting of the inverter 25, the present utility model can convert direct current into alternating current to provide power for some modules that require an AC power supply, ensuring the normal operation of the entire water quality monitor.

[0051] Refer to the appendix Figure 9 As shown, the working principle of the inverter 25 in the present utility model is described as follows:

[0052] The inverter 25 mainly consists of an input filter, a rectifier filter circuit, a PWM controller, an inverter circuit, etc. When a DC power supply is input, it is converted into smooth direct current through the rectifier filter circuit. Then, the PWM controller adjusts the amplitude and frequency of the output voltage as needed, controls the on-off state of the switching tubes in the inverter circuit, thereby realizing the conversion of direct current to alternating current. Finally, the alternating current output from the inverter circuit is transmitted to the load. In the inverter circuit, the on-off state of the switching tubes is controlled by the PWM controller according to the magnitude and frequency of the output voltage. By changing the on-off time of the switching tubes, the magnitude and frequency of the output voltage can be adjusted, thereby realizing the adjustment of the AC power supply. It should be particularly noted that the present application does not improve the inverter 25, and only the working principle of the inverter is simply described here for easy understanding of the inverter 25.

[0053] Refer to the appendix Figure 4 As shown, in the present utility model, the monitoring module 5 includes a pH sensor 51, a temperature sensor 52, a turbidity sensor 53, a dissolved oxygen sensor 54, and a conductivity sensor 55 connected to the central processor 1 and the power supply module 2; the first standby module 7 is located between the power supply module 2 and the monitoring module 5.

[0054] The present utility model can monitor the acidity and alkalinity of water through the setting of the pH sensor 51; through the setting of the temperature sensor 52, the water temperature can be monitored; through the setting of the turbidity sensor 53, the turbidity of water can be monitored; through the setting of the dissolved oxygen sensor 54, the dissolved oxygen concentration of water can be monitored; through the setting of the conductivity sensor 55, the conductivity in water can be monitored; it should be particularly noted that the pH sensor 51, temperature sensor 52, turbidity sensor 53, dissolved oxygen sensor 54 and conductivity sensor 55 in this application can be connected to an AC power supply or a DC power supply according to actual needs.

[0055] Refer to the appendix Figure 3 As shown, in the present utility model, the wireless communication module 6 includes an antenna 61, a radio frequency front end 62 bidirectionally connected to the antenna 61, an intermediate frequency amplifier 63 connected to the radio frequency front end 62, a modulator / demodulator 64 connected to the intermediate frequency amplifier 63 and the radio frequency front end 62, and the modulator / demodulator 64 is also connected to the central processor 1; the second standby module 8 is arranged between the wireless communication module 6 and the second standby module 8.

[0056] Through the setting of the antenna 61 in the present utility model, it is used to receive and send wireless signals. Specifically, it receives radio frequency signals from the air and converts them into current signals and sends them to the radio frequency front end 62, and converts the radio frequency signals output by the radio frequency front end into electromagnetic waves and radiates them into space; through the setting of the radio frequency front end 62, it is used to preliminarily process the radio frequency signals transmitted by the antenna 61, such as filtering, amplifying, etc., and amplifies the modulated radio frequency signals and then transmits them to the antenna for transmission; through the setting of the intermediate frequency amplifier 63, it is used to further improve the intermediate frequency signal to meet the demodulation requirements; through the setting of the modulator / demodulator 64, it is used to restore the radio frequency or intermediate frequency signals to baseband signals and to convert the baseband signals into radio frequency signals.

[0057] Refer to the appendix Figure 3 and Figure 4 As shown, in the present utility model, the first standby module 7 includes a plurality of first standby switches 71 connected to the central processor 1. The number of the plurality of first standby switches 71 is equal to the number of sensors of the monitoring module 5, and they are arranged on branches and correspond to the sensors one by one, and are used to control the on / off between each sensor and the power supply module 2; the second standby module 8 includes a plurality of second standby switches 81 connected to the central processor 1, and the plurality of second standby switches 81 are respectively used to control the on / off between the radio frequency front end 62, the intermediate frequency amplifier 63, the modulator / demodulator 64 and the power supply module 2.

[0058] With the setting of the first standby switch 71, the connection between each sensor and the power supply module can be disconnected, enabling the monitoring module 5 to enter a power-off standby state, thereby reducing power consumption and extending the battery life of the water quality monitor. Specifically, after each sensor completes data detection and transmits the data to the central processor 1, it can enter the power-off standby state. Compared with powering off the entire monitoring module 5, this application is more flexible and can perform power-off processing according to the actual detection situation of each sensor. With the setting of the second standby switch 81, the wireless communication module 6 can be powered off and the power-off process can be carried out according to the actual usage situation. Specifically, when receiving signals is required, all components can be powered on. When transmitting data is needed, the intermediate frequency amplifier 63 can be powered off, and only the radio frequency front end 62 and the modem 64 need to be connected.

[0059] Refer to the appendix Figure 1 — Figure 9 As shown, the working principle of the present utility model is as follows:

[0060] When the power grid coverage is wide at the location where the water quality monitor is deployed and it is very convenient to use the 220V conventional power supply, at this time, all three control switches are in the closed state. Connect the 220V power supply to the AC interface 231. After activating the entire water quality monitor, the AC current sensor 35 senses that the AC interface 231 is connected to a 220V AC power supply and transmits the signal to the central processor 1. After receiving the signal, the central processor 1 controls the first control switch 31 and the second control switch 32 to disconnect and closes the third control switch 33 to supply power from the 220V AC power supply. Then connect the mobile power supply through the USB interface 211.

[0061] When the power grid coverage is small at the location where the water quality monitor is deployed and it is inconvenient to use the 220V conventional power supply, and it is necessary to cooperate with the solar module 22 and the USB external module 21 for power supply, connect the mobile power supply to the USB interface 211. After the mobile power supply activates the entire water quality monitor, when the water quality monitor does not sense other power sources through the DC current sensor 34 and the AC current sensor 35, disconnect the second control switch 32 and the third control switch 33. If the sunlight is sufficient when using the USB external module 21 for power supply, the photovoltaic module 221 converts solar energy into electrical energy and stores it in the battery pack 222. When the electrical energy in the battery pack 222 is sufficient to supply power to the water quality detector, the DC current sensor 34 transmits a signal to the central processor 1. After receiving the signal, the central processor 1 issues an instruction to disconnect the first control switch 31 and simultaneously close the second control switch 32; it should be noted that the time difference between the two control switches is a few milliseconds and will not cause a power outage of the central processor 1; similarly, if the electrical energy of the battery pack 222 is insufficient, after the central processor 1 receives the signal from the DC current sensor 34, it disconnects the second control switch 32 and simultaneously closes the first control switch.

[0062] See appendix Figure 1 — Figure 10 As shown, the processes of the first standby module 7 and the second standby module 8 of the present utility model are as follows:

[0063] First, the central processor 1 controls all the first standby switches 71 to be closed simultaneously, so that each sensor in the monitoring module 5 is powered on at the same time. After one sensor completes data monitoring and transmits the data to the central processor 1, the central processor 1 controls the corresponding first standby switch 71 to be closed after receiving the data, and repeats continuously until all the first standby switches 71 are closed;

[0064] Then, the central processor 1 closes the second standby switches 81 corresponding to the RF front end 62 and the modulator / demodulator 64, and sends the data information. After receiving the signal from the remote terminal, it indicates that the data transmission is completed. At this time, the second standby switches 81 are disconnected, and the time is recorded simultaneously for the next cycle;

[0065] Finally, when the time read by the RTC module 4 reaches the specified time, the RTC module 4 sends a signal to the central processor 1, and the central processor 1 controls all the first standby switches 71 to be closed again, repeating the above steps.

[0066] The above embodiments are illustrative of the present application and not restrictive. Any simple transformation of the present application belongs to the protection scope of the present application.

Claims

1. A low-power water quality monitor, characterized in that, It includes a central processing unit (1), a power supply module (2) connected to the central processing unit (1), a power management module (3) connected to the central processing unit (1) and used to control the on / off relationship between the power supply module (2) and the central processing unit (1), an RTC module (4) connected to the central processing unit (1), a monitoring module (5) and a wireless communication module (6) connected to the power supply module (2), a first standby module (7) and a second standby module (8) connected to the central processing unit (1). The first standby module (7) is used to control the on / off between the monitoring module (5) and the power supply module (2), and the second standby module (8) is used to control the on / off between the power supply module (2) and the wireless communication module (6). The power supply module (2) includes a USB external connection module (21), a solar module (22) and an AC power supply module (23). The power management module (3) is used to switch the on / off of multiple power modules in the power supply module (2).

2. The low-power water quality monitor according to claim 1, wherein The power management module (3) includes a first control switch (31), a second control switch (32), a third control switch (33), a DC current sensor (34) and an AC current sensor (35) connected to the central processing unit (1). The first control switch (31) is connected to the USB external connection module (21); the second control switch (32) is connected to the solar module (22); the third control switch (33) is connected to the AC power supply module (23); the DC current sensor (34) is arranged between the solar module (22) and the second control switch (32); the AC current sensor (35) is arranged between the third control switch (33) and the AC power supply module (23).

3. The low-power water quality monitor according to claim 2, characterized in that, The USB external connection module (21) includes a USB interface (211) and a boost converter (212) connected to the USB interface (211). The first control switch (31) is located between the USB interface (211) and the boost converter (212).

4. The low-power water quality monitor according to claim 3, characterized in that, Both the solar module (22) and the AC power supply module (23) are connected with a buck-boost converter (24). The solar module (22) includes a photovoltaic module (221) and a battery pack (222) connected to the photovoltaic module (221). The battery pack (222) is connected to the DC current sensor (34), and the output end of the battery pack (222) is connected to the buck-boost converter (24). The second control switch (32) is located between the battery pack (222) and the buck-boost converter (24). A charge controller (223) is arranged between the photovoltaic module (221) and the battery pack (222).

5. The low-power water quality monitor according to claim 4, characterized in that, The AC power supply module (23) includes an AC interface (231) and a rectifier (232) connected to the AC interface (231). The output end of the rectifier (232) is connected to the buck-boost converter (24). The third control switch (33) is located between the rectifier (232) and the buck-boost converter (24), and the AC current sensor (35) is located between the AC interface (231) and the rectifier (232).

6. The low-power water quality monitor according to claim 1, characterized in that, The output end of the power supply module (2) is provided with two lines, and an inverter (25) is provided on one of the lines.

7. The low-power water quality monitor according to claim 1, characterized in that, The monitoring module (5) includes a pH sensor (51), a temperature sensor (52), a turbidity sensor (53), a dissolved oxygen sensor (54), and a conductivity sensor (55) connected to the central processor (1) and the power supply module (2); the first standby module (7) is located between the power supply module (2) and the monitoring module (5).

8. The low-power water quality monitor according to claim 1, wherein The wireless communication module (6) includes an antenna (61), a radio frequency front end (62) bidirectionally connected to the antenna (61), an intermediate frequency amplifier (63) connected to the radio frequency front end (62), a modulator-demodulator (64) connected to the intermediate frequency amplifier (63) and the radio frequency front end (62), and the modulator-demodulator (64) is also connected to the central processor (1); the second standby module (8) is arranged between the wireless communication module (6) and the second standby module (8).

9. The low-power water quality monitor according to claim 7, characterized in that, The first standby module (7) includes a plurality of first standby switches (71) connected to the central processor (1), the number of the plurality of first standby switches (71) is equal to the number of sensors of the monitoring module (5), and they are arranged on the branches in one-to-one correspondence with the sensors, and are used to control the on-off between each sensor and the power supply module (2).

10. The low-power water quality monitor according to claim 8, characterized in that, The second standby module (8) includes a plurality of second standby switches (81) connected to the central processor (1), and the plurality of second standby switches (81) are respectively used to control the on-off between the radio frequency front end (62), the intermediate frequency amplifier (63), the modulator-demodulator (64) and the power supply module (2).

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