Water pump control system

Abstract

The utility model discloses a water pump control system, which belongs to the technical field of water pump control, and comprises a signal input module, a first control module, a driving circuit and a water pump which are connected in sequence, and further comprises a current detection module, the output end of the current detection module is connected with the first control module. Current information of the water pump is collected through the current detection module, running current of the water pump can be monitored in real time, when the current exceeds a current threshold value, the first controller can cut off a power source in time, and the water pump is prevented from being damaged due to overload.

Description

Technical Field

[0001] This utility model relates to the field of water pump control technology, and in particular to a water pump control system. Background Technology

[0002] Water pumps are used to transport or pressurize liquids, using mechanical energy to move liquids from low to high pressure areas or from low-pressure to high-pressure areas. They are widely used in industry, agriculture, and drainage. A water pump control system manages the pump's operating status and typically includes a primary control module, a signal input module, a drive circuit, and the pump itself. The output of the signal input module is connected to the primary control module, which in turn connects to the pump via the drive circuit. The primary control module then controls the pump's start-up and shutdown, ensuring that water supply or drainage needs are met. Currently, water pump control systems have limited electrical parameter tracking; they do not support current sampling and cannot monitor the pump's operating current in real time. Utility Model Content

[0003] The purpose of this invention is to overcome the problems of the prior art and provide a water pump control system.

[0004] The purpose of this utility model is achieved through the following technical solution: a water pump control system, wherein a signal input module, a first control module, a drive circuit and a water pump are connected in sequence, and the system further includes a current detection module connected to the power supply circuit of the water pump, and the output terminal of the current detection module is connected to the first control module.

[0005] In one example, the system further includes a voltage detection module, the input of which is connected to the power supply circuit of the water pump, and the output of which is connected to the first control module.

[0006] In one example, the system further includes a liquid level detection module, a water flow detection module, a water shortage protection switch signal detection module, and a water flow switch module. The liquid level detection module is used to collect liquid level information of the water tank where the water pump is located, and the water flow detection module is used to collect water flow information. The liquid level detection module is connected to the water shortage protection switch signal detection module, the water flow detection module is connected to the water flow switch module, and the water shortage protection switch signal detection module and the water flow switch module are connected to the first control module.

[0007] In one example, the system further includes an inspection cabinet instruction receiving module, which includes a fire emergency instruction receiving submodule; the input end of the inspection cabinet instruction receiving module is connected to the second control module of the inspection cabinet, and the output end of the inspection cabinet instruction receiving module is connected to the first control module.

[0008] In one example, the signal input module includes a switching circuit and a rectifier circuit. One end of the switching circuit is connected to an input terminal of the rectifier circuit, the other end of the switching circuit is grounded, and the output terminal of the rectifier circuit is connected to the first control module.

[0009] In one example, the signal input module further includes an optocoupler circuit, the input of which is connected to the rectifier circuit, and the output of which is connected to the first control module.

[0010] In one example, the driving circuit includes a transistor, a first switch, and a second switch; the three output terminals of the first control module are respectively connected to the coil of a first switch via a transistor, and the contacts of each first switch are respectively connected to the coil of a second switch. The contacts of two second switches are respectively connected to the power supply circuit of the water pump, and a connection point is led out from the connection circuit between the contact of any second switch and the water pump. The contact of the third second switch is connected to the connection point.

[0011] In one example, the system further includes a power module, which includes voltage conversion circuitry for outputting DC voltages of varying magnitudes.

[0012] In one example, the power module is located on the control circuit board of the first control module.

[0013] In one example, the power module further includes a surge protection and anti-interference circuit, the output of which is connected to a voltage conversion circuit.

[0014] It should be further noted that the technical features corresponding to the above system examples can be combined or replaced to form new technical solutions.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. In one example, the current information of the water pump is collected by the current detection module, which can monitor the operating current of the water pump in real time. When the current exceeds the current threshold, the first controller can cut off the power supply in time to prevent the water pump from being damaged due to overload.

[0017] 2. In one example, the voltage detection module collects the water pump's voltage information, enabling real-time monitoring of the pump's operating voltage. When the voltage is too high or too low, the first controller can cut off the power supply or adjust the pump's operating status to prevent damage. Furthermore, it simultaneously collects current and voltage information, supporting three-phase voltage and three-phase current sampling, enabling phase reversal and phase loss detection. By collecting current and voltage information, the actual power of the water pump can be obtained, thus better monitoring the pump's operating efficiency.

[0018] 3. In one example, by using a liquid level detection module in conjunction with a water shortage protection switch signal detection module, the water pump can be turned on in time when the water level in the pool is lower than the set water level threshold, thus realizing the water shortage protection function; by using a water flow detection module in conjunction with a water flow switch module, the first control module can control the working status of the water pump according to the real-time water flow information, thus realizing the automatic adjustment of the water pump status.

[0019] 4. In one example, the inspection cabinet receives instructions from the inspection cabinet, such as fire emergency instructions, through the inspection cabinet instruction receiving module. The first controller can then promptly start the water pump to extinguish the fire in the event of a fire, improving the efficiency and reliability of fire extinguishing.

[0020] 5. In one example, the active AC signal is rectified by the rectifier circuit and transmitted to the first control module. At the same time, the rectifier module directly receives the active DC signal and transmits it to the first control module. The switching circuit is then connected to the two input terminals of the rectifier circuit. At this time, the system switches to passive mode to realize passive dry contact input and active / passive mode switching, which can be compatible with multiple signal input modes.

[0021] 6. In one example, signal isolation is achieved through an optocoupler circuit, ensuring safety during use.

[0022] 7. In one example, by cooperating with the first and second switches in the drive circuit, it is possible to achieve one-on-one standby control, two-on-one standby control, and star-delta start-up of the water pump, which can be compatible with the control requirements of various scenarios.

[0023] 8. In one example, by introducing a power supply module to power the first control module and the water pump respectively, there is no need to introduce an additional power supply for the water pump, which reduces the overall circuit size and lowers the cost.

[0024] 9. In one example, the power module is integrated onto the control circuit board, further reducing the overall circuit size.

[0025] 10. In one example, lightning protection, surge protection, and interference suppression circuitry are introduced to improve the safety and reliability of the power supply circuit. Attached Figure Description

[0026] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The accompanying drawings are provided to provide a further understanding of the present application and constitute a part of the present application. The same reference numerals are used in these drawings to denote the same or similar parts. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application.

[0027] Figure 1 A system block diagram provided as an example of this utility model;

[0028] Figure 2 A circuit diagram of a current detection module provided as an example of this utility model;

[0029] Figure 3 A circuit diagram of a voltage detection module provided as an example of this utility model;

[0030] Figure 4 The circuit diagram of the water shortage protection switch signal detection module and the water flow switch module provided as an example of this utility model;

[0031] Figure 5 A circuit diagram of the inspection cabinet instruction receiving module provided as an example of this utility model;

[0032] Figure 6 A circuit schematic diagram of a signal input module provided as an example of this utility model;

[0033] Figure 7 A circuit schematic diagram of a portion of the driving circuit provided as an example of this utility model;

[0034] Figure 8 A circuit schematic diagram of another part of the driving circuit provided as an example of this utility model;

[0035] Figure 9 A circuit schematic diagram of a power supply module provided as an example of this utility model;

[0036] Figure 10 The schematic diagram of the lightning protection, surge protection, and interference suppression circuit provided as an example of this utility model. Detailed Implementation

[0037] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] In the description of this utility model, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the use of ordinal numbers (e.g., "first and second," "first to fourth," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0041] In one example, a water pump control system, such as Figure 1 As shown, the system includes a signal input module, a first control module, a drive circuit, and a water pump connected in sequence. The first control module controls the water pump's operation by controlling the start and stop of the water pump motor through the drive circuit. The signal input module receives user input signals (such as start and stop signals) and feeds them back to the first control module. The first control module includes a controller and peripheral circuits (such as a clock circuit). The controller can be any of a microcontroller, PLC, or FPGA, and the controller and peripheral circuits are mounted on a control circuit board. The drive circuit receives control commands from the first control module and converts them into electrical signals that drive the water pump motor, thus achieving actual control of the water pump. Under the control of the drive circuit, the water pump performs start and stop operations, such as pumping water from a low-pressure area to a high-pressure area, or transporting water from a low-pressure area to a high-pressure area, realizing liquid transport and pressurization. Furthermore, the system also includes a current detection module. The input terminal of the current detection module is connected in series in the water pump's power supply circuit, and the output terminal of the current detection module is connected to the first control module. Figure 2As shown, the current detection module uses a current transformer to collect current signals. In this example, the primary side (P5-1#Ia-1, P5-1#Ia-2) of the current transformer is connected in parallel to the AC power supply circuit of the water pump, specifically between the power supply circuit output and the water pump motor. The secondary side of the current transformer is connected to a rectifier bridge formed by four diodes. A resistor R54, a polarized capacitor C53, and a capacitor C56 are connected in parallel between the two outputs of the rectifier bridge. One end of resistor R54, one end of polarized capacitor C53, and one end of capacitor C56 are connected to ground. A resistor R53 is installed between the other end of resistor R54 and the other end of polarized capacitor C53. A resistor R59 is provided between the other ends of capacitor C53 and capacitor C56. A connection point is led out between resistor R59 and capacitor C56 and connected to two diodes (D10, D11). The cathode of diode D10 is connected to a high level (3.3V), and the anode of diode is grounded. Simultaneously, the connection point between resistor R59 and capacitor C56 is connected to the input / output terminal (I / O port) of the first control module, enabling the first control module to acquire the real-time current signal (three-phase current signal) of the water pump motor, thereby realizing the detection of current overload. The real-time current can also be displayed by connecting a display (such as LCD or LED) to the controller output. Optionally, two or more stages of current transformers can be set for current acquisition. It should be noted that the digital signal received by the input / output terminal of the first control module is specifically processed by analog-to-digital conversion using an AD converter, which is common knowledge in the field and will not be elaborated further below.

[0042] In one example, the system also includes a voltage detection module, the input of which is connected to the power supply circuit of the water pump, and the output of which is connected to the first control module. Figure 3 As shown, this example voltage detection module is used to collect the three-phase (A-phase, B-phase, C-phase) voltage of the water pump motor. The voltage collection principle is the same for each phase. Taking the collection of the A-phase AC voltage as an example, the voltage detection module includes resistors R81, R86, R89, R92, and R95 connected in sequence. Resistor R81 is connected to the output terminal of the power supply circuit to collect the A-phase voltage. Resistor R95 is connected to the primary side of AC transformer AC2. Resistor R98 and capacitor are connected in parallel between the two output terminals of the secondary side of AC transformer AC2. One end of resistor R98 and one end of capacitor C74 are connected to the reference voltage Vref. The other end of capacitor C74 is connected between diodes D26 and D27. The cathode of diode D26 is connected to a high level (3.3V), and the anode of diode D27 is grounded. At the same time, the other end of capacitor C74 is connected to the input / output terminal of the controller through resistor R10, so that the first control module can obtain the real-time voltage signal (three-phase voltage signal) and then perform voltage and phase judgment to realize undervoltage, overvoltage, phase loss and phase reversal protection.

[0043] In one example, the system also includes a liquid level detection module, a water flow detection module, a water shortage protection switch signal detection module, and a water flow switch module. The liquid level detection module is used to collect the liquid level information of the water tank where the water pump is located, and can be a liquid level sensor. The water flow detection module is used to collect water flow information, and can be a water flow sensor (or a water flow switch). The data output terminal of the liquid level detection module is connected to the water shortage protection switch signal detection module, the data output terminal of the water flow detection module is connected to the water flow switch module, and the water shortage protection switch signal detection module and the water flow switch module are connected to the first control module. Figure 4 As shown, the water shortage protection switch signal detection module includes an optocoupler OP17. A capacitor C122, a resistor R186, and a Zener diode D65 are connected in parallel between the two input terminals of the optocoupler OP17. The cathode of the Zener diode D65 is connected to the data output terminal (J2-water shortage protection) of the liquid level detection module, and a resistor R181 is connected in series between the cathode of the Zener diode D65 and the resistor R186. Furthermore, one output terminal (pin 4) of the optocoupler OP17 is connected to a resistor R191, and the other end of the resistor R191 is connected to a high level (3.3V). At the same time, a capacitor C127 is connected between the output terminal (pin 4) of the optocoupler OP17 and the resistor R191. The capacitor C127 and the other output terminal (pin 3) of the optocoupler OP17 are connected to ground. The connection between the resistor R191 and the capacitor C127 is used as the output of the water shortage protection switch signal detection module. That is, a point is led out from the resistor R191 and the capacitor C127 and connected to the input / output terminal of the first control module. Thus, when the water level in the pool is lower than the low water level threshold, the first controller controls the water pump to start working, and when the water level in the pool is higher than the high water level threshold, the first controller controls the water pump to stop working.

[0044] Furthermore, it is preferable to provide two or more flow switch modules. This example includes two flow switch modules, and the circuit principles of the two flow switch modules are the same. The explanation will focus on one of the flow switch modules. Figure 4As shown, the water flow switch module includes an optocoupler OP18. A capacitor C123, a resistor R187, and a Zener diode D66 are connected in parallel between the two input terminals of the optocoupler OP18. The cathode of the Zener diode D66 is connected to the data output terminal of the water flow sensor (J2-1# water flow switch), and a resistor R182 is connected in series between the cathode of the Zener diode D66 and the resistor R187. Furthermore, a resistor R192 is connected to one output terminal (pin 4) of the optocoupler OP18, and the other end of the resistor R192 is connected to a high level (3.3V). At the same time, a capacitor C128 is connected between the output terminal (pin 4) of the optocoupler OP18 and the resistor R192. The capacitor C128 and the other output terminal (pin 3) of the optocoupler OP18 are connected to ground. The connection between the resistor R192 and the capacitor C128 is used as the output of the water flow switch module. That is, a point is led out from the resistor R192 and the capacitor C128 and connected to the input / output terminal of the first control module. This allows the first control module to control the water pump motor to perform corresponding actions (start or stop) based on the real-time water flow information. For example, when the real-time water flow reaches the set flow rate, the water flow sensor outputs a "1" switch signal. The first controller confirms that the water flow is normal and controls the water pump motor to continue working to continuously provide water flow. When the real-time water flow is lower than the set flow rate, the water flow sensor outputs a "0" switch signal. The first controller judges that the water flow in the pipeline is abnormal (such as blockage) and controls the water pump motor to stop working.

[0045] In one example, the system further includes a patrol cabinet instruction receiving module, which includes a fire emergency instruction receiving submodule. The input terminal of the patrol cabinet instruction receiving module is connected to the second control module of the patrol cabinet, and the output terminal is connected to the first control module. Preferably, the patrol cabinet instruction receiving module also includes a patrol cabinet return instruction receiving submodule and a mechanical emergency interlock instruction receiving submodule. The fire emergency instruction is a patrol interlock output instruction, a signal issued by the second controller in the patrol cabinet, detected by switches (such as pressure switches, flow switches, and alarm valve switches), used to quickly start the fire pump in the event of a fire. When a fire signal is triggered, the second controller of the patrol cabinet outputs a patrol interlock output instruction to the first controller, which then directly starts the fire pump. The patrol cabinet return instruction is a feedback signal issued by the second controller of the patrol cabinet, used to confirm the status of the pump. For example, after the fire pump successfully starts, the first controller sends a confirmation signal to the patrol cabinet. After receiving the confirmation signal, the second controller of the patrol cabinet outputs a patrol cabinet return instruction to the first controller, indicating that the pump has been confirmed to be in operation. The mechanical emergency interlock command is issued by the second controller of the inspection cabinet and detected by a switch. It is used to mechanically force the fire pump to start in the event of a circuit fault. That is, after receiving the mechanical emergency interlock command, the first controller prompts personnel to mechanically force the fire pump to start. Figure 5As shown, the fire emergency command receiving submodule includes an NPN transistor Q20 and a relay K18. The emitter of transistor Q20 is grounded, and a capacitor C131 and a resistor R196 are connected in parallel between the base and emitter of transistor Q20. One end of resistor R196 is connected in series with resistor R195, and the other end of resistor R195 receives the inspection interlock output command (MCU-inspection interlock output). The collector of transistor Q20 is divided into two paths. One path is directly connected to one end of the relay coil (pin 2), and the other path is connected to the other end of the relay coil (pin 1) through diode D69. The cathode of diode D69 and the relay coil are both connected to a high level (12V). The contacts of the relay are connected to the input / output terminal of the first controller, thereby enabling the first controller to obtain the inspection interlock output command output by the inspection cabinet.

[0046] Furthermore, such as Figure 5 As shown, the inspection cabinet return command receiving submodule includes an optocoupler OP22. A capacitor C133, a resistor R200, and a Zener diode D73 are connected in parallel between the two input terminals of the optocoupler OP22. The cathode of the Zener diode D73 receives the inspection cabinet return command (J7-inspection cabinet return-2), and a resistor R198 is connected in series between the cathode of the Zener diode D73 and the resistor R200. Furthermore, one output terminal (pin 4) of the optocoupler OP22 is connected to a resistor R202, and the other end of the resistor R202 is connected to a high level (3.3V). At the same time, a capacitor C135 is connected between the output terminal (pin 4) of the optocoupler OP22 and the resistor R202. The capacitor C135 and the other output terminal (pin 3) of the optocoupler OP22 are connected to ground. The connection between the resistor R202 and the capacitor C135 is used as the output of the inspection cabinet return command receiving submodule. That is, a point is led out from the resistor R202 and the capacitor C135 and connected to the input / output terminal of the first control module, so that the first controller can obtain the inspection cabinet return command output by the inspection cabinet.

[0047] Furthermore, such as Figure 5As shown, the mechanical emergency interlock command receiving submodule includes an optocoupler OP21. A capacitor C132, a resistor R199, and a Zener diode D72 are connected in parallel between the two input terminals of the optocoupler OP21. The cathode of the Zener diode D72 receives the mechanical emergency interlock command (J7-Mechanical Emergency Interlock-2), and a resistor R197 is connected in series between the cathode of the Zener diode D72 and the resistor R199. Furthermore, one output terminal (pin 4) of the optocoupler OP21 is connected to a resistor R201, and the other end of the resistor R201 is connected to a high level (3.3V). At the same time, a capacitor C134 is connected between the output terminal (pin 4) of the optocoupler OP21 and the resistor R201. The capacitor C134 and the other output terminal (pin 3) of the optocoupler OP21 are connected to ground. The connection between the resistor R201 and the capacitor C134 is used as the output of the mechanical emergency interlock command receiving submodule. That is, a point is led out from the resistor R201 and the capacitor C134 and connected to the input / output terminal of the first control module, thereby enabling the first controller to obtain the mechanical emergency interlock command output by the inspection cabinet.

[0048] In one example, the signal input module includes a switching circuit and a rectifier circuit. One end of the switching circuit is connected to an input terminal of the rectifier circuit, and the other end of the switching circuit is grounded. The output terminal of the rectifier circuit is connected to the first control module. The switching circuit is a DIP switch circuit, and the rectifier circuit is a diode rectifier circuit. Preferably, the output terminal of the diode rectifier circuit is connected to an optocoupler circuit. Figure 6As shown, this example system includes two signal input modules with identical circuit designs. The description will focus on one of these signal input modules. The rectifier circuit of this example signal input module consists of a bridge rectifier circuit formed by four diodes. One input terminal of the rectifier bridge is connected in sequence to resistor R67, resistor R62, diode D33, and DIP switch K1AK1B. The other terminals of DIP switches K1A and K1B are grounded. Between the two output terminals of the rectifier bridge, capacitor C23, polarized capacitor C57, and Zener diode DZ17 are connected in parallel in sequence. The cathode of Zener diode DZ17 is connected to Zener diode DZ5, the anode of Zener diode DZ5 is connected to the cathode of diode D30, the anode of diode D30 is connected to the anode of Zener diode DZ14, and the cathode of Zener diode DZ14 is connected to a high level (24V). The anode of Zener diode DZ17 is connected to one input terminal of optocoupler OP14, and the anode of Zener diode DZ5 is connected to the input terminal of diode D30. A point is led out between the cathodes of 0 and connected to the other input terminal of optocoupler OP14. One output terminal (pin 4) of optocoupler OP14 is connected to the other output terminal (pin 3) of optocoupler OP14 via capacitor C83 and then grounded. Pin 3 of optocoupler OP14 is connected to LED7 and resistor R70 via resistor R63. Resistor R63 and LED7 are connected to a high level (3.3V). A point is led out from resistor R63 and capacitor C83 and connected to the input / output terminal of the first control module, and resistor R70 is connected to the input / output terminal of the first control module. In this example, the signal passes through the rectifier bridge to the internal circuit. After the rectifier bridge, there are filter capacitors and Zener diodes. If it is a DC signal, it passes directly through. If it is an AC signal, it is rectified and filtered to become DC. Finally, it enters the front end of the optocoupler and is transmitted to the back end by the optocoupler to the processor to obtain the input signal. Further, the switching circuit is turned on and connected to the two input terminals of the rectifier circuit. At this time, it switches to passive mode to realize passive dry contact input. Active DC and active AC input and passive dry contact input modes are all integrated into a single controller port, which can be compatible with multiple signal input modes.

[0049] In one example, the drive circuit includes three drive sub-circuits: a pump star-bottom drive sub-circuit, a pump delta drive sub-circuit, and a pump common drive sub-circuit. Each drive sub-circuit has the same circuit structure, including a transistor, a first switch, and a second switch. The first switch can be a relay, and the second switch can be a contactor. The three output terminals (I / O ports) of the first control module are each connected to a relay drive circuit, and the relay drive circuit is connected to a contactor circuit. Figure 7As shown, the relay drive circuits are all the same. Taking the pump-star bottom drive sub-circuit as an example, the output terminal of the first control module (MCU-1# pump-star bottom output) is connected to the base of transistor Q5 through resistor R109. The emitter of transistor Q5 is grounded, and capacitor C80 and resistor R110 are connected in parallel between the base and emitter of transistor Q5. The collector of transistor Q5 is divided into two paths: one path is directly connected to one end of the coil of relay K3, and the other end is connected to the other end of the coil of relay through diode D31. The cathode of diode D31 and the coil of relay are both connected to a high level (12V). The contacts of relay are connected to the coil of contactor KM1. Based on the same principle, the connection between the contacts of the three relays and the coils of the three contactors is realized. Further, as... Figure 8 As shown, the contacts of contactors KM2 and KM3 are connected in series in the power supply circuit (power input) of the water pump, and a connection point is led out from the contact of contactor KM2 or contactor KM3 in the connection circuit with the water pump. The contact of contactor KM1 is connected to this connection point. In this example, pump star-bottom control, pump delta control, and pump common control (unified control of all water pumps through the first control module) are integrated into a first control module. The first control module controls the relay, and then the relay controls the external AC contactor to achieve switching, realizing the drive control of the water pump motor by the first control module. Preferably, the system includes three drive circuits, which control three water pump motors respectively. At this time, one-use-two-standby control, two-use-one-standby control, etc. can be realized. Specifically, when the first control module controls one water pump motor as the main unit and the other two water pump motors as standby, it forms one-use-two-standby control; when the first control module controls two water pump motors as the main unit and the other water pump motor as standby, it forms two-use-one-standby control, thus accommodating the control needs of various scenarios.

[0050] In one example, the system also includes a power supply module, which includes a voltage conversion circuit for outputting DC voltages of different magnitudes to provide operating voltages for the controller, drive circuit, signal input module, etc., in the first control module. Optionally, the voltage conversion circuit can be one or more of a voltage regulator chip, a boost chip, or a buck chip to achieve voltage regulation. In this example, the voltage conversion circuit is a small switching power supply, specifically using a monolithic integrated MOSFET switching power supply chip, such as... Figure 9As shown, the voltage conversion circuit includes a transformer T1 with an EE22 magnetic core. On one end of the primary winding of transformer T1 (pin 1), resistors R24 and R22, capacitor C18, Zener diode D1, and capacitor C15 are connected in sequence. Capacitor C15 is connected to the live and neutral wires of the power supply. Further, capacitor C18 is connected in parallel with resistor R19. The cathode of Zener diode D1 is connected between capacitor C18 and resistor R19. Resistor R22 is connected in parallel with resistor R23, and resistor R24 ​​is connected in parallel with resistor R24. Resistors R19, R23, and R26 are connected together and then connected to diode D2. The anode of diode D2 is connected to the other end of the primary winding of the transformer (pin 2). Simultaneously, the diode D2... The anode is connected to pins 5-8 of power chip U2. Resistors R17, R16, and R14 are connected in parallel to pin 1 of power chip U2. Resistors R17, R16, and R14 are grounded after a common connection. Pin 2 of power chip U2 is connected to the common terminal of resistors R17, R16, and R14 and then grounded. Polarized capacitors C19 and C20 are connected in parallel to pin 3 of power chip U3. One end of polarized capacitors C19 and C20 is grounded after a common connection, and the other end is connected to a high level (14V). Simultaneously, pin 3 of power chip U3 is connected to one input terminal (pin 4) of transformer T1 via resistor R25 and diode D3. ), and one end of resistor R25 is connected to a high level (14V); pin 4 of power chip U2 is connected to one input terminal (pin 4) of optocoupler OP1, and a grounding capacitor C22 is also connected between pin 4 of optocoupler OP1 and pin 4 of power chip U2, and the other input terminal (pin 3) of optocoupler OP1 is grounded; polarized capacitors C28, C30 and resistor R32 are connected in parallel between the two ends (pins 10 and 9) of the secondary winding of transformer, diode D4 is provided between capacitor C28 and pin 10 of the secondary winding of transformer, and capacitor C26 and resistor R27 are connected in parallel between pin 10 of the secondary winding of transformer and the anode of diode D4 and between capacitor C30 and resistor R32; furthermore, resistor R3 2. The other end is connected to pin 1 of power chip U4 via resistor R31, and resistor R37 is connected to pin 1 of power chip U4. The other end of resistor R37 is connected to pins 2 and 4 of power chip U4. A parallel capacitor C37 and a polarized capacitor C38 are connected to the common connection point of pins 2 and 4 of power chip U4 and resistor R37, and the other ends of capacitors C37 and C38 are grounded. Further, one end of resistor R32 is connected to a sliding resistor, and the other end of the sliding resistor is connected to a polarized capacitor C31, which is grounded. At the same time, a point is led out between the polarized capacitor C31 and the sliding resistor and connected to pin 3 of power chip U4. Pin 3 of power chip U4 outputs a 24V DC voltage.Furthermore, one end of the secondary lower winding of transformer T1 (pin 6) is grounded, and the other end of the secondary lower winding (pin 7) is connected to diode D6. Diode D5 is connected in parallel between the anode and cathode of diode D6. Simultaneously, a capacitor C27 and a resistor R28 are connected in series in parallel between the anode and cathode of diode D6. Furthermore, the cathodes of diodes D5 and D6 are both connected to the output terminal of optocoupler OP1, and a resistor R30 is connected between the two output terminals of optocoupler OP1. Resistor R30 is connected to resistor R29, and resistor R29 is connected to… A grounded Zener diode U3 is connected, and a capacitor C32 is placed between the resistor R29 and the cathode of the Zener diode U3. The sub-circuit formed by capacitor C32, resistor R33, and capacitor C33 is connected in parallel. A point is led out from the common connection point between capacitors C32 and C33 and connected to the grounding resistor R36. The other end of resistor R36 is connected to resistor R35. Resistor R35 is connected to the cathodes of diodes D5 and D6 via resistor R34, grounding capacitor C36, inductor L3, and grounding capacitor C34. A 12V lead is drawn between resistor R34 and capacitor C36. DC voltage; furthermore, a parallel resistor R38 and a light-emitting diode LED1 are connected between resistor R34 and capacitor C36, and LED1 is grounded; the other end of resistor R36 is also connected to a grounded polarized capacitor C39 and a grounding capacitor C40, the other end of grounding capacitor C40 is connected to the input pin (pin 3) of power chip U5, and a capacitor C42 is connected between the bootstrap pin (BOOT pin) and the switch pin (SW pin) of power chip U5, and there is also a connection between the switch pin of power chip U5 and capacitor C42. An inductor L4 is connected, with its other end connected to a grounding capacitor C43 and a grounded polarized capacitor C45. The other end of the polarized capacitor C45 is connected to a resistor R39 and a grounding resistor R40. A capacitor C37 is connected between the polarized capacitor C45 and the resistor R39. Capacitor C37 is connected between the resistor R39 and the grounding resistor R40. A point is led out from between the resistor R39 and the grounding resistor R40 and connected to the feedback pin (FB pin) of the power supply chip U5. A 5V DC voltage is drawn from between the polarized capacitor C45 and the resistor R39. Optionally, in this example, a voltage regulator chip is also connected to the 5V DC voltage output terminal for voltage reduction, thereby outputting a 3.3V DC voltage. Optionally, the power supply module is located on the control circuit board of the first control module, further reducing the overall circuit size.

[0051] In one example, the power module also includes surge protection and anti-interference circuitry, the output of which is connected to a voltage conversion circuit. Figure 10As shown, the lightning protection, surge protection, and interference suppression circuit includes resistors RV1, RV2, and RV3. Resistors RV2 and RV3 are connected in series and then in parallel with resistor RV1. Resistors RV2 and RV3 are grounded. One end of resistor RV1 is connected to the phase line of the AC power supply via resistor R12, and the other end of resistor RV1 is connected to the neutral line of the AC power supply via resistor R13. Furthermore, resistors R21 and R20 are connected in series in parallel across resistors RV2 and RV3. A capacitor C21 is connected in parallel across resistors R21 and R20. The two ends of capacitor C21 are connected to pins 1 and 4 of common-mode filter L1. Capacitors C23 and C24 are connected in parallel between pins 3 and 2 of common-mode filter L1. Capacitors C23 and C24 are grounded, and capacitor C29 is connected in parallel across capacitors C23 and C24. This completes the lightning protection, surge protection, and interference suppression process.

[0052] Combining the above examples yields a preferred embodiment of the present invention. In this embodiment, the system includes a signal input module, a first control module, a drive circuit, and a water pump connected sequentially. It also includes a current detection module, a voltage detection module, a liquid level detection module, a water flow detection module, a water shortage protection switch signal detection module, a water flow switch module, an inspection cabinet instruction receiving module, and a power supply module. The current detection module, voltage detection module, water shortage protection switch signal detection module, water flow switch module, and inspection cabinet instruction receiving module are all connected to the first control module. The liquid level detection module is connected to the water shortage protection switch signal detection module, and the water flow detection module is connected to the water flow switch module. The power supply module provides DC operating voltage to all the above modules. The circuit principles of each module are as follows: Figure 2-10 As shown, details will not be repeated here. This utility model system supports three-phase voltage and three-phase current sampling, employs waveform sampling and judgment, and has the function of phase reversal and phase loss judgment. Simultaneously, through the liquid level detection module and the water shortage protection switch signal detection module, the water pump can be activated in a timely manner when the water level in the pool is lower than the set water level threshold, realizing the water shortage protection function; through the water flow detection module and the water flow switch module, the first control module can control the working state of the water pump according to real-time water flow information, realizing automatic adjustment of the water pump status. Furthermore, through the inspection cabinet instruction receiving module, instructions from the inspection cabinet, such as fire emergency instructions, are received, and the first controller can promptly start the water pump for fire extinguishing in the event of a fire, improving fire extinguishing efficiency and reliability. Furthermore, a small switching power supply is integrated into the controller of the first control module, eliminating the need for an external power supply. The input interface integrates active DC and active AC inputs, as well as passive dry contact inputs, and the switching between active and passive inputs only requires configuring a DIP switch, resulting in high operational convenience. Furthermore, the system output interface supports one-on-one standby and two-on-one standby for ordinary AC contactor control, and also supports star-delta start mode, which can be compatible with the control needs of various scenarios.

[0053] The above detailed embodiments are a description of the present utility model. It should not be considered that the specific embodiments of the present utility model are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present utility model, and all of these should be considered to fall within the protection scope of the present utility model.

Claims

1. A water pump control system, comprising a signal input module, a first control module, a drive circuit, and a water pump connected in sequence, characterized in that: The system also includes a current detection module, which is connected to the power supply circuit of the water pump, and the output terminal of the current detection module is connected to the first control module.

2. The water pump control system according to claim 1, characterized in that: The system also includes a voltage detection module, the input of which is connected to the power supply circuit of the water pump, and the output of which is connected to the first control module.

3. The water pump control system according to claim 1, characterized in that: The system also includes a liquid level detection module, a water flow detection module, a water shortage protection switch signal detection module, and a water flow switch module. The liquid level detection module is used to collect the liquid level information of the water tank where the water pump is located, and the water flow detection module is used to collect the water flow information. The liquid level detection module is connected to the water shortage protection switch signal detection module, the water flow detection module is connected to the water flow switch module, and the water shortage protection switch signal detection module and the water flow switch module are connected to the first control module.

4. The water pump control system according to claim 1, characterized in that: The system also includes an inspection cabinet instruction receiving module, which includes a fire emergency instruction receiving submodule; the input end of the inspection cabinet instruction receiving module is connected to the second control module of the inspection cabinet, and the output end of the inspection cabinet instruction receiving module is connected to the first control module.

5. The water pump control system according to claim 1, characterized in that: The signal input module includes a switching circuit and a rectifier circuit. One end of the switching circuit is connected to an input terminal of the rectifier circuit, and the other end of the switching circuit is grounded. The output terminal of the rectifier circuit is connected to the first control module.

6. The water pump control system according to claim 5, characterized in that: The signal input module also includes an optocoupler circuit, the input end of which is connected to the rectifier circuit, and the output end of which is connected to the first control module.

7. The water pump control system according to claim 1, characterized in that: The driving circuit includes a transistor, a first switch, and a second switch. The three output terminals of the first control module are respectively connected to the coil of a first switch via a transistor. The contacts of each first switch are respectively connected to the coil of a second switch. The contacts of two second switches are respectively connected to the power supply circuit of the water pump, and a connection point is led out from the connection circuit between the contact of any second switch and the water pump. The contact of the third second switch is connected to the connection point.

8. The water pump control system according to claim 1, characterized in that: The system also includes a power supply module, which includes a voltage conversion circuit for outputting DC voltages of different magnitudes.

9. The water pump control system according to claim 8, characterized in that: The power supply module is located on the control circuit board of the first control module.

10. The water pump control system according to claim 8, characterized in that: The power module also includes a lightning protection, surge protection, and interference suppression circuit, the output of which is connected to a voltage conversion circuit.

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