Embedded intelligent constant-pressure water supply frequency converter

Abstract

An embedded intelligent constant-pressure water supply frequency converter belongs to the field of water supply control circuits, and aims to solve the problem that a frequency converter and a water supply controller are independently arranged. The first end of the three-phase line is connected with the inversion loop; the water pump system comprises a water supply pump control motor and a pressure sensor, a three-phase winding of the water supply pump control motor is connected with the second end of the three-phase line, and the pressure sensor is used for collecting water supply pressure of the water pump system; the control circuit comprises a variable-frequency controller and a water supply controller, the input end of the variable-frequency controller is connected with the pressure sensor, the output end of the variable-frequency controller is connected with the water pump control motor, and the output end of the water supply controller is connected with the water pump control motor; the driving circuit is connected with the control circuit; the input of the protection circuit comprises the first input and the second input, and the effect is that the problems of system deployment complexity and other compatibility caused by the fact that an independent water supply controller is arranged outside the frequency converter in the prior art are solved.

Description

Technical Field

[0001] This utility model belongs to the field of water supply control circuits and relates to an embedded intelligent constant pressure water supply frequency converter. Background Technology

[0002] As an advanced power control device, the core of a frequency converter lies in using pulse width modulation (PWM) technology to control power switching elements and regulate the operating power frequency of an AC motor. This not only optimizes the motor's operating efficiency but also achieves energy saving and precise speed regulation. This device mainly consists of key components such as a rectifier (converting AC to DC), a filter, an inverter (converting DC back to AC), a braking unit, a drive unit, a detection unit, and a microprocessor unit. In addition to its basic functions, the frequency converter integrates numerous protection functions, including overcurrent protection, overvoltage protection, and overload protection, which greatly enhance the system's reliability and safety. With the continuous improvement of industrial automation, the application scope of frequency converters is constantly expanding, covering a wide range of uses from traditional manufacturing to emerging renewable energy fields. Furthermore, by introducing Internet of Things (IoT) technology, remote monitoring, predictive maintenance, and automatic fault diagnosis can be achieved.

[0003] In the field of variable frequency constant pressure water supply, most existing technologies use general-purpose frequency converters and a dedicated water supply controller to independently control the speed and operation of the water pumps. This approach controls the pump speed by adjusting the motor's operating frequency through the frequency converter, thereby regulating water flow and pressure to achieve constant pressure water supply control. The water supply controller is used to control the start and stop of the water supply and to control the pump to achieve the planned water supply volume. This approach treats the frequency converter system and the water supply controller system as two relatively independent systems. On the one hand, it increases the complexity of system deployment, adds extra integration and debugging work, and may lead to compatibility issues because the frequency converter and water supply controller may come from different manufacturers. On the other hand, this approach not only increases the total system cost but also increases the risk of failure and reduces reliability due to additional port connections. Furthermore, the separate components may make maintenance and troubleshooting more difficult. Utility Model Content

[0004] To address the issue of separate inverter and water supply controller setups, this invention integrates the inverter controller and water supply controller into a single control circuit. Improvements are made to the protection and drive circuits resulting from this integration. Furthermore, the connections between the various circuits are adjusted to ensure the circuit can accommodate the integration of the inverter controller and water supply controller. In particular, the circuit structure of the protection and drive circuits is further designed to achieve effective hardware protection.

[0005] An embedded intelligent constant pressure water supply frequency converter according to some embodiments of this application includes...

[0006] The main circuit includes an inverter circuit;

[0007] The three-phase line has its first end connected to the inverter circuit.

[0008] The water pump system includes a water supply pump control motor and a pressure sensor. The three-phase windings of the water supply pump control motor are connected to the second end of the three-phase line, and the pressure sensor is used to collect the water supply pressure of the water pump system.

[0009] The control circuit includes a frequency converter and a water supply controller. The input terminal of the frequency converter is connected to the pressure sensor, the output terminal of the frequency converter is connected to the water pump control motor, and the output terminal of the water supply controller is connected to the water pump control motor.

[0010] The drive circuit is connected to the control circuit.

[0011] The protection circuit has two inputs: a first input and a second input.

[0012] The first input is connected to the main circuit and is used to collect the bus voltage Ud and bus current Id of the inverter stage of the main circuit.

[0013] The second input is connected to the three-phase line and is used to collect the phase voltage U, phase voltage V, phase voltage W of the inverter stage, and output current Iw of the inverter stage.

[0014] According to some embodiments of the embedded intelligent constant pressure water supply frequency converter of this application, the protection circuit further includes a third input, which is connected to a pressure sensor for collecting the water supply pressure of the water pump system.

[0015] According to some embodiments of this application, the embedded intelligent constant pressure water supply frequency converter includes a protection circuit, comprising:

[0016] A sampling amplification and conditioning circuit, which includes a first input, a first output terminal, and a second output terminal;

[0017] The main control chip includes a first input terminal, a second input terminal, a first output terminal, and general-purpose input / output terminals.

[0018] A logic comparator includes a first input and an output.

[0019] in:

[0020] The first output terminal of the sampling amplification and conditioning circuit is connected to the first input terminal of the main control chip;

[0021] The second output of the sampling amplification and conditioning circuit is connected to the first input of the logic comparator.

[0022] The second output of the sampling amplification and conditioning circuit is connected to the output of the logic comparator.

[0023] According to some embodiments of the embedded intelligent constant pressure water supply frequency converter of this application, the sampling amplification and conditioning circuit includes a first resistor, a second circuit, a first operational amplifier, a third resistor, and a first capacitor;

[0024] Wherein, the first end of the first resistor is connected to the first input terminal, the second output terminal has a first branch and a second branch, the first branch is connected to the second resistor and grounded, and the second branch is connected to the first input terminal of the first operational amplifier;

[0025] The output of the first operational amplifier has a third branch and a fourth branch. The third branch is connected to the second input terminal of the operational amplifier, and the fourth branch is connected to the first terminal of the third resistor.

[0026] The second end of the third resistor has a fifth branch and a sixth branch. The fifth branch is the second output terminal. The sixth branch has a seventh branch and an eighth branch. The seventh branch is connected to the capacitor and grounded. The eighth branch is the first output terminal.

[0027] According to some embodiments of the present application, the embedded intelligent constant pressure water supply frequency converter has a first input terminal of the main control chip including a first ADC channel and a second ADC channel.

[0028] The main control chip's output terminals include PWM control logic output terminals;

[0029] The sampling amplification and conditioning circuit includes a first conditioning circuit, a second conditioning circuit, a third conditioning circuit, a fourth conditioning circuit, a fifth conditioning circuit, and a sixth conditioning circuit.

[0030] The first input terminal of the first conditioning circuit is the bus voltage Ud of the inverter preamp, the first output terminal is connected to the first ADC channel, and the second output terminal is connected to the first input terminal of the first logic comparator.

[0031] The first input terminal of the second conditioning circuit is the bus current Id of the inverter preamplifier, the first output terminal is connected to the first ADC channel, and the second output terminal is connected to the first input terminal of the second logic comparator.

[0032] The first input terminal of the third conditioning circuit receives the phase voltage U of the inverter stage, the first output terminal is connected to the second ADC channel, and the second output terminal is connected to the first input terminal of the third logic comparator.

[0033] The first input terminal of the fourth conditioning circuit receives the phase voltage V of the inverter stage, the first output terminal is connected to the second ADC channel, and the second output terminal is connected to the first input terminal of the fourth logic comparator.

[0034] The first input terminal of the fifth conditioning circuit receives the phase voltage W of the inverter stage, the first output terminal is connected to the second ADC channel, and the second output terminal is connected to the first input terminal of the fifth logic comparator.

[0035] The first input terminal of the sixth conditioning circuit receives the output current Iw of the inverter stage, the first output terminal is connected to the second ADC channel, and the second output terminal is connected to the first input terminal of the sixth logic comparator.

[0036] According to some embodiments of the embedded intelligent constant pressure water supply frequency converter of this application, the first input terminal of the main control chip further includes a third ADC channel, and the sampling amplification and conditioning circuit further includes a seventh conditioning circuit.

[0037] The first input terminal of the seventh conditioning circuit is connected to the pressure sensor of the water pump system, the first output terminal is connected to the third ADC channel, and the second output terminal is connected to the first input terminal of the seventh logic comparator.

[0038] According to some embodiments of this application, the embedded intelligent constant pressure water supply frequency converter has a main control chip that is a TMS320F280034 chip with an integrated DSP processor.

[0039] An embedded intelligent constant pressure water supply frequency converter according to some embodiments of this application includes a first communication circuit and a second communication circuit, wherein the first communication circuit is a wireless remote communication module or a wired remote communication module, and the second communication circuit is a wireless remote communication module or a wired remote communication module.

[0040] According to some embodiments of this application, the embedded intelligent constant pressure water supply frequency converter has a drive circuit including a drive module and a switch module. The drive module includes a PWM drive module and a drive protection module.

[0041] The switching module includes a first insulated-gate bipolar transistor, a second insulated-gate bipolar transistor, a third insulated-gate bipolar transistor, a fourth insulated-gate bipolar transistor, a fifth insulated-gate bipolar transistor, and a sixth insulated-gate bipolar transistor.

[0042] in:

[0043] The emitter of the first insulated gate bipolar transistor is connected to the collector of the second insulated gate bipolar transistor, and the U-phase line in the three-phase line is connected to the line connecting the two.

[0044] The emitter of the third insulated-gate bipolar transistor is connected to the collector of the fourth insulated-gate bipolar transistor, and the V-phase line in the three-phase line is connected to the line connecting the two.

[0045] The emitter of the fifth insulated-gate bipolar transistor is connected to the collector of the sixth insulated-gate bipolar transistor, and the W phase line of the three-phase line is connected to the line connecting the two.

[0046] The collectors of the fifth insulated-gate bipolar transistor, the third insulated-gate bipolar transistor, and the first insulated-gate bipolar transistor are connected; the emitters of the sixth insulated-gate bipolar transistor, the fourth insulated-gate bipolar transistor, and the second insulated-gate bipolar transistor are connected.

[0047] The drive protection module includes a fourth resistor, a first light-emitting diode, a first transistor, and a first diode.

[0048] Among them, the collector of an insulated gate bipolar transistor is connected to the drive protection module of a drive module, the collector of an insulated gate bipolar transistor is connected to the fourth resistor of the drive protection module, the fourth resistor is connected to the negative terminal of the first light-emitting diode, and the positive terminal of the first light-emitting diode is grounded.

[0049] The base of the first transistor is connected to the anode of the first diode, and the collector of the first transistor is the output terminal of the drive protection module.

[0050] The PWM drive module includes a fifth resistor, a second light-emitting diode, a second transistor, a second diode, and a second capacitor.

[0051] In this configuration, the fifth resistor of a PWM drive module is connected to an output terminal of the PWM control logic, the fifth resistor is connected to the positive terminal of the second light-emitting diode, and the negative terminal of the light-emitting diode is grounded; the base of the second transistor is connected to the positive terminal of the second diode, the collector of the second transistor has a first branch and a second branch, the first branch of the collector of the second transistor is connected to the first terminal of the second capacitor, and the emitter of the transistor is connected to the second terminal of the second capacitor and grounded.

[0052] The second branch of the collector of the second transistor is the output terminal of the PWM drive module and is connected to the gate of an insulated gate bipolar transistor.

[0053] According to some embodiments of this application, the embedded intelligent constant pressure water supply frequency converter uses an M57959L chip as its drive circuit.

[0054] The embedded intelligent constant pressure water supply frequency converter also includes a display circuit and an input circuit, which are connected to the control circuit.

[0055] Beneficial Effects: This invention integrates the frequency converter controller and the water supply controller into the control circuit, avoiding the system deployment complexity and other compatibility issues caused by setting up a separate water supply controller outside the frequency converter in existing technologies. To accommodate the above-mentioned circuit integration, this invention further improves the protection circuit, drive circuit, etc., and further adjusts the connections of each circuit so that the circuit can adapt to the integration of the frequency converter controller and the water supply controller. In particular, the circuit structure of the protection circuit and drive circuit is further designed to achieve effective hardware protection.

[0056] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0057] Figure 1 This is a circuit block diagram of the present invention.

[0058] Figure 2 This is a schematic diagram of the main circuit principle of the frequency converter in this utility model, which consists of rectified current, intermediate circuit, and inverter circuit.

[0059] Figure 3 This is a schematic diagram of the protection circuit principle in this utility model.

[0060] Figure 4 This is a schematic diagram of the driving circuit in this utility model.

[0061] Figure 5 This is a schematic diagram illustrating the operation and display panel principle of the digital tube version in this utility model.

[0062] Figure 6 This is a schematic diagram illustrating the operation and display panel principle of the LCD version in this utility model.

[0063] Figure 7 This is a block diagram of the control circuit principle of this utility model. Detailed Implementation

[0064] The embodiments of this application are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0065] Figure 1 This is an embedded intelligent constant pressure water supply frequency converter, comprising a frequency converter body and an operation display panel. The frequency converter body includes a rectifier circuit, an intermediate circuit, an inverter circuit controlled by a drive circuit, a drive circuit for generating pulse width modulation signals to control the inverter circuit, a protection circuit, and a control circuit, etc.

[0066] Figure 2The system's main circuit is illustrated, such as... Figure 2 As shown, the main circuit of the system consists of three parts: a rectifier circuit, an intermediate circuit, and an inverter circuit. The rectifier circuit can be a three-phase full-wave rectifier circuit composed of six diodes. It is used to rectify the input three-phase AC power (R, S, T) into DC power. The intermediate circuit is equipped with a filter capacitor to smooth the rectified DC power. By filtering out high-frequency AC ripple, the intermediate circuit outputs a smoother DC voltage. The inverter circuit can be a three-phase inverter bridge composed of six switching transistors. Each switching transistor corresponds to the positive and negative half-cycles of one phase (U, V, W), and its conduction and cutoff are controlled by pulse width modulation (PWM) or other control methods. Through the combined action of the switching transistors, the DC power is inverted into three-phase AC power to drive the three-phase motor load of the water pump system.

[0067] Figure 3 The protection circuit is illustrated, such as... Figure 3 As shown, the protection circuit has three inputs: a first input, a second input, and a third input. The first input is connected to the main circuit and is used to acquire the bus voltage Ud and bus current Id of the inverter stage. The second input is connected to the three-phase lines and is used to acquire the phase voltages U, V, and W of the inverter stage, as well as the output current Iw of the inverter stage. The third input is connected to a pressure sensor and is used to acquire the water supply pressure of the pump system.

[0068] The protection circuit includes a sampling amplification and conditioning circuit, which includes a first input, a first output, and a second output. The main control chip includes a first input, a second input, a first output, and general-purpose input / output terminals. The logic comparator includes a first input and an output.

[0069] Specifically: The first output of the sampling amplification and conditioning circuit is connected to the first input of the main control chip. The second output of the sampling amplification and conditioning circuit is connected to the first input of the logic comparator. The second output of the sampling amplification and conditioning circuit is connected to the output of the logic comparator. The first input of the main control chip includes a first ADC channel, a second ADC channel, and a third ADC channel. The output of the main control chip includes a PWM control logic output.

[0070] The sampling amplification and conditioning circuit includes a first resistor, a second circuit, a first operational amplifier, a third resistor, and a first capacitor. The first resistor has its first terminal connected to its first input terminal. Its second terminal outputs a first branch and a second branch; the first branch is connected to the second resistor and grounded, and the second branch is connected to the first input terminal of the first operational amplifier. The first operational amplifier outputs a third branch and a fourth branch; the third branch is connected to the second input terminal of the operational amplifier, and the fourth branch is connected to the first terminal of the third resistor. The third resistor has a fifth branch and a sixth branch; the fifth branch is the second output terminal, and the sixth branch has a seventh branch and an eighth branch; the seventh branch is connected to the capacitor and grounded, and the eighth branch is the first output terminal.

[0071] The sampling amplification and conditioning circuit includes a first conditioning circuit, a second conditioning circuit, a third conditioning circuit, a fourth conditioning circuit, a fifth conditioning circuit, a sixth conditioning circuit, and a seventh conditioning circuit. The first conditioning circuit receives the bus voltage Ud from the inverter pre-stage at its first input terminal, its first output terminal is connected to the first ADC channel, and its second output terminal is connected to the first input terminal of the first logic comparator. The second conditioning circuit receives the bus current Id from the inverter pre-stage at its first input terminal, its first output terminal is connected to the first ADC channel, and its second output terminal is connected to the first input terminal of the second logic comparator. The third conditioning circuit receives the phase voltage U from the inverter post-stage at its first input terminal, its first output terminal is connected to the second ADC channel, and its second output terminal is connected to the first input terminal of the third logic comparator. The fourth conditioning circuit receives the phase voltage V from the inverter post-stage at its first input terminal, its first output terminal is connected to the second ADC channel, and its second output terminal is connected to the first input terminal of the fourth logic comparator. The fifth conditioning circuit receives the phase voltage W from the inverter post-stage at its first input terminal, its first output terminal is connected to the second ADC channel, and its second output terminal is connected to the first input terminal of the fifth logic comparator. The first input of the sixth conditioning circuit receives the output current Iw from the inverter stage, the first output is connected to the second ADC channel, and the second output is connected to the first input of the sixth logic comparator. The first input of the seventh conditioning circuit is connected to the pressure sensor of the water pump system, the first output is connected to the third ADC channel, and the second output is connected to the first input of the seventh logic comparator.

[0072] In a preferred embodiment, the main control chip is a TMS320F280034 chip with an integrated DSP processor.

[0073] The input-side sampling of this utility model's protection circuit monitors the input voltage (Ud) and other electrical parameters. It uses an operational amplifier for signal sampling and includes current and voltage detection functions. The protection circuit can provide overvoltage, undervoltage, and short-circuit protection based on the input signal, ensuring the circuit disconnects the input under abnormal conditions. The output-side sampling and protection circuit detects the output voltage and current to prevent overload, short-circuit, and other faults. The protection circuit processes the signal through the operational amplifier in the sampling amplification and conditioning circuit, providing feedback to the main control chip. The main control chip processes the acquired input and output signals, acquiring and digitizing the analog input and output signals through ADC channels 1, 2, and 3. Based on the sampled signals, the main control chip can perform corresponding protection actions or adjust the PWM output. On one hand, it can adjust the power supply's output voltage or current; on the other hand, in certain abnormal conditions (such as short circuits or overloads), it can reduce the output power by decreasing the PWM duty cycle, thereby achieving the purpose of the protection circuit. The PWM signal generated by the main control chip drives the power devices, controlling the on / off state of the output current.

[0074] Figure 4 The driving circuit is illustrated, such as Figure 4 As shown, the driving circuit includes a driving module and a switching module. The driving module includes a PWM driving module and a driving protection module. The switching module includes a first insulated-gate bipolar transistor (IGBT), a second IGBT, a third IGBT, a fourth IGBT, a fifth IGBT, and a sixth IGBT.

[0075] Specifically: The emitter of the first insulated-gate bipolar transistor (IGBT) is connected to the collector of the second IGBT, and the U-phase line of the three-phase line is connected to the connection between the two. The emitter of the third IGBT is connected to the collector of the fourth IGBT, and the V-phase line of the three-phase line is connected to the connection between the two. The emitter of the fifth IGBT is connected to the collector of the sixth IGBT, and the W-phase line of the three-phase line is connected to the connection between the two. Specifically, the collectors of the fifth, third, and first IGBTs are connected. The emitters of the sixth, fourth, and second IGBTs are connected.

[0076] The drive protection module includes a fourth resistor, a first light-emitting diode (LED), a first transistor, and a first diode. The collector of an insulated-gate bipolar transistor (IGBT) is connected to the drive protection module of the drive module. The collector of the IGBT is connected to the fourth resistor of the drive protection module. The fourth resistor is connected to the cathode of the first LED. The anode of the first LED is grounded. The base of the first transistor is connected to the anode of the first diode. The collector of the first transistor is the output terminal of the drive protection module.

[0077] The PWM drive module includes a fifth resistor, a second light-emitting diode (LED), a second transistor, a second diode, and a second capacitor. The fifth resistor of the PWM drive module is connected to an output terminal of the PWM control logic. The fifth resistor is also connected to the anode of the second LED, and the cathode of the LED is grounded. The base of the second transistor is connected to the anode of the second diode. The collector of the second transistor has a first branch and a second branch. The first branch of the collector of the second transistor is connected to the first terminal of the second capacitor, and the emitter of the transistor is connected to the second terminal of the second capacitor and grounded. The second branch of the collector of the second transistor is the output terminal of the PWM drive module and is connected to the gate of an insulated-gate bipolar transistor (IGBT).

[0078] As a preferred option, the driving circuit is the M57959L chip.

[0079] This utility model's drive circuit comprises six drive units (Driver 1 to Driver 6). Each drive has its own PWM drive signal and fault feedback signal. When a drive (e.g., Driver 1) malfunctions, the drive protection module detects the fault and outputs a fault feedback signal, triggering a protection or alarm mechanism. The main control chip of the protection circuit receives the signal, and the PWM control logic output terminal outputs a PWM drive signal to the PWM drive module. The PWM drive module then outputs the signal to the switching module. Each IGBT in the switching module controls the corresponding three-phase line switch, thereby controlling the operating state of the drive module for motors or other actuators. The PWM signal typically adjusts the output power by adjusting the duty cycle. Therefore, the drive circuit has hardware protection functionality, capable of directly shutting down power devices during overcurrent, achieving a rapid response.

[0080] The control circuit includes a frequency converter and a water supply controller. The input of the frequency converter is connected to a pressure sensor, and the output of the frequency converter is connected to the water pump control motor. The output of the water supply controller is also connected to the water pump control motor. By integrating the frequency converter and the water supply controller, a separate water supply controller is no longer required. The frequency converter is used to perform constant pressure water supply control, adjusting the speed of the water pump in the system according to user-set parameters to achieve stable water supply pressure. It also has necessary automatic protection functions to prevent overpressure and overload of the water pump during operation. The water supply controller is used to automatically adjust the water supply pressure according to user settings and time periods.

[0081] Figure 5 The diagram illustrates the operation and display panel, such as... Figure 5 As shown, the operation and display support two different versions: a digital tube version and an LCD version. The circuit principle of the digital tube version is as follows: Figure 5 As shown, the display section consists of 5 digits and 5 indicator lights, used to show the inverter's operating status. Eight buttons provide independent control, allowing users to set parameters and switch status views. A rotary knob is also included for quick adjustment of the set pressure or frequency. The LCD version directly supports touch operation and maintains a compatible interface with the digital tube version, allowing for easy user replacement.

[0082] Figure 7This is an overall block diagram of an intelligent constant pressure water supply frequency converter. Voltage and current sampling modules monitor voltage and current signals in the system, serving as the foundational data for system monitoring and control. They collect the actual voltage and current of the circuit's operating state and provide this data to the main circuit, protection circuit, drive circuit, and control circuit. Pressure sensors collect pressure signals from the pump system to detect the water supply pressure in the pipeline, feeding back to the frequency converter to form a closed-loop stable control. The power supply circuit provides a stable operating voltage for the entire system; the drive circuit, main circuit, and protection circuit rely on this power. The drive circuit controls the actuators in the system, driving the pump's start-up, shutdown, and operating status. It receives commands from the control circuit and performs necessary drive operations. The protection circuit monitors the system's operating status, ensuring the equipment's safety and reliability under abnormal conditions such as overvoltage, overcurrent, or overheating. The control circuit includes the frequency converter and the water supply controller. The intelligent frequency converter control is the core of the system, dynamically adjusting the system's operating status by monitoring voltage, current, and other signals. The water supply controller controls the pumps, managing the water supply system by intelligently adjusting the pump's start-up, shutdown, and pressure. It can work in conjunction with pressure sampling and frequency converters to ensure the stability of the water supply system. The signal output unit transmits system status and operating information to other devices via digital signals, facilitating the integration of the frequency converter into other systems for joint control. The system supports two remote communication methods: wireless remote data transmission and control via a 4G network module, enabling real-time monitoring of equipment status or remote adjustment; and wired remote data communication via an RS485 interface, suitable for local control or monitoring in industrial control environments.

[0083] This utility model relates to an embedded intelligent constant pressure water supply frequency converter, a highly integrated frequency converter capable of frequency conversion constant pressure control of water pumps for water supply control. Specifically, the frequency converter controller and water supply controller are integrated into the frequency converter control circuit. By sampling signals such as voltage, current, and pressure, it controls the equipment and provides functions such as frequency conversion speed regulation and water supply adjustment. Simultaneously, the system has remote communication capabilities, supporting both wireless and wired communication, making it suitable for applications requiring remote monitoring and control. It is understood that functions such as sampling pressure to achieve constant water pressure control via the frequency converter are already achievable with existing frequency converters, and the water supply controller also provides existing water supply control functions. This utility model primarily improves upon this by integrating the controller into the frequency converter and refining the circuit structure of the protection and drive circuits. Based on this controller integration, it provides more suitable circuit connections to achieve effective circuit protection. This utility model features a compact circuit structure and low cost. Through its technical solution, it enables the management and control of a constant pressure water supply system, allowing for maintenance-free automatic constant pressure operation based on user parameter settings, thus reducing maintenance costs.

[0084] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0086] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0087] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0088] In this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one" refers to one or more; "at least one of A and B," similar to "A and / or B," describes the relationship between related objects, indicating that three relationships can exist. For example, at least one of A and B can represent: A alone, A and B simultaneously, or B alone.

[0089] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0090] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An embedded intelligent constant pressure water supply frequency converter, characterized in that, The application relates to a water pump system protection circuit. The main circuit comprises an inverter circuit; The three-phase line is connected with the first end of the inverter circuit; The water pump system comprises a water supply pump control motor and a pressure sensor, the three-phase winding of the water supply pump control motor is connected with the second end of the three-phase line, and the pressure sensor is used for collecting the water supply pressure of the water pump system; The control circuit comprises a frequency conversion controller and a water supply controller, the input end of the frequency conversion controller is connected with the pressure sensor, the output end of the frequency conversion controller is connected with the water pump control motor, and the output end of the water supply controller is connected with the water pump control motor; The driving circuit is connected with the control circuit; The input of the protection circuit comprises a first input and a second input; The first input is connected with the main circuit and is used for collecting the bus voltage Ud and the bus current Id of the pre-inversion stage of the main circuit; The second input is connected with the three-phase line and is used for collecting the phase voltage U, the phase voltage V, the phase voltage W and the output current Iw of the post-inversion stage.

2. The embedded smart constant pressure water supply frequency converter according to claim 1, characterized in that, The protection circuit further comprises a third input connected with the pressure sensor and used for collecting the water supply pressure of the water pump system.

3. An embedded smart constant pressure water supply frequency converter according to claim 1 or 2, characterized in that, The protection circuit comprises a sampling amplification conditioning circuit, the sampling amplification conditioning circuit comprises a first input and first and second output ends; The main control chip comprises a first input end, a second input end, a first output and a general input and output end; The logic comparator comprises a first input end and an output end; The first output end of the sampling amplification conditioning circuit is connected with the first input end of the main control chip; The second output end of the sampling amplification conditioning circuit is connected with the first input end of the logic comparator; The second output end of the sampling amplification conditioning circuit is connected with the output end of the logic comparator. The sampling amplification conditioning circuit comprises a first resistor, a second resistor, a first operational amplifier, a third resistor and a first capacitor; 4. The embedded smart constant pressure water supply frequency converter according to claim 3, characterized in that, The first end of the first resistor is connected with the first input end, the second end outputs a first branch and a second branch, the first branch is connected with the second resistor and grounded, and the second branch is connected with the first input end of the first operational amplifier; The output of the first operational amplifier has a third branch and a fourth branch, the third branch is connected with the second input end of the operational amplifier, and the fourth branch is connected with the first end of the third resistor; The second end of the third resistor has a fifth branch and a sixth branch, the fifth branch is the second output end, the sixth branch has a seventh branch and an eighth branch, the seventh branch is connected with the capacitor and grounded, and the eighth branch is the first output end. The first input end of the main control chip comprises a first ADC channel and a second ADC channel; 5. The embedded smart constant pressure water supply frequency converter according to claim 3, characterized in that, The output end of the main control chip comprises a PWM control logic output end; The sampling amplification conditioning circuit comprises a first conditioning circuit, a second conditioning circuit, a third conditioning circuit, a fourth conditioning circuit, a fifth conditioning circuit and a sixth conditioning circuit; The first input end of the first conditioning circuit inputs the bus voltage Ud of the pre-inversion stage, the first output end is connected with the first ADC channel, and the second output end is connected with the first input end of the first logic comparator; ​ The first input terminal of the second conditioning circuit is the bus current Id of the inverter preamplifier, the first output terminal is connected to the first ADC channel, and the second output terminal is connected to the first input terminal of the second logic comparator. The first input terminal of the third conditioning circuit receives the phase voltage U of the inverter stage, the first output terminal is connected to the second ADC channel, and the second output terminal is connected to the first input terminal of the third logic comparator. The first input terminal of the fourth conditioning circuit receives the phase voltage V of the inverter stage, the first output terminal is connected to the second ADC channel, and the second output terminal is connected to the first input terminal of the fourth logic comparator. The first input terminal of the fifth conditioning circuit receives the phase voltage W of the inverter stage, the first output terminal is connected to the second ADC channel, and the second output terminal is connected to the first input terminal of the fifth logic comparator. The first input terminal of the sixth conditioning circuit receives the output current Iw of the inverter stage, the first output terminal is connected to the second ADC channel, and the second output terminal is connected to the first input terminal of the sixth logic comparator.

6. The embedded smart constant pressure water supply frequency converter according to claim 5, characterized in that, The first input terminal of the main control chip also includes a third ADC channel, and the sampling amplification and conditioning circuit also includes a seventh conditioning circuit; The first input terminal of the seventh conditioning circuit is connected to the pressure sensor of the water pump system, the first output terminal is connected to the third ADC channel, and the second output terminal is connected to the first input terminal of the seventh logic comparator.

7. The embedded smart constant pressure water supply frequency converter according to claim 1, characterized in that, The main control chip is the TMS320F280034 chip with an integrated DSP processor.

8. The embedded smart constant pressure water supply frequency converter according to claim 1, characterized in that, It includes a first communication circuit and a second communication circuit, wherein the first communication circuit is a wireless remote communication module or a wired remote communication module, and the second communication circuit is a wireless remote communication module or a wired remote communication module.

9. The embedded smart constant pressure water feeder frequency converter according to claim 1, characterized in that, The drive circuit includes a drive module and a switching module. The drive module includes a PWM drive module and a drive protection module. The switching module includes a first insulated-gate bipolar transistor, a second insulated-gate bipolar transistor, a third insulated-gate bipolar transistor, a fourth insulated-gate bipolar transistor, a fifth insulated-gate bipolar transistor, and a sixth insulated-gate bipolar transistor. in: The emitter of the first insulated gate bipolar transistor is connected to the collector of the second insulated gate bipolar transistor, and the U-phase line in the three-phase line is connected to the line connecting the two. The emitter of the third insulated-gate bipolar transistor is connected to the collector of the fourth insulated-gate bipolar transistor, and the V-phase line in the three-phase line is connected to the line connecting the two. The emitter of the fifth insulated-gate bipolar transistor is connected to the collector of the sixth insulated-gate bipolar transistor, and the W phase line of the three-phase line is connected to the line connecting the two. The collectors of the fifth insulated-gate bipolar transistor, the third insulated-gate bipolar transistor, and the first insulated-gate bipolar transistor are connected; the emitters of the sixth insulated-gate bipolar transistor, the fourth insulated-gate bipolar transistor, and the second insulated-gate bipolar transistor are connected. The drive protection module includes a fourth resistor, a first light-emitting diode, a first transistor, and a first diode. Among them, the collector of an insulated gate bipolar transistor is connected to the drive protection module of a drive module, the collector of an insulated gate bipolar transistor is connected to the fourth resistor of the drive protection module, the fourth resistor is connected to the negative terminal of the first light-emitting diode, and the positive terminal of the first light-emitting diode is grounded. The base of the first transistor is connected to the anode of the first diode, and the collector of the first transistor is the output terminal of the drive protection module. The PWM drive module includes a fifth resistor, a second light-emitting diode, a second transistor, a second diode, and a second capacitor. In this configuration, the fifth resistor of a PWM drive module is connected to an output terminal of the PWM control logic, the fifth resistor is connected to the positive terminal of the second light-emitting diode, and the negative terminal of the light-emitting diode is grounded; the base of the second transistor is connected to the positive terminal of the second diode, the collector of the second transistor has a first branch and a second branch, the first branch of the collector of the second transistor is connected to the first terminal of the second capacitor, and the emitter of the transistor is connected to the second terminal of the second capacitor and grounded. The second branch of the collector of the second transistor is the output terminal of the PWM drive module and is connected to the gate of an insulated gate bipolar transistor.

10. The embedded smart constant pressure water supply frequency converter according to claim 1, characterized in that, The driving circuit uses the M57959L chip; The embedded intelligent constant pressure water supply frequency converter also includes a display circuit and an input circuit, which are connected to the control circuit.

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