A water pump controller

Abstract

This utility model relates to a water pump controller, solving the problem of high energy consumption in existing shielded circulating pumps. The technical solution includes a main control chip, a rectifier and filter module electrically and signal-connected to the main control chip, and an EMC module electrically connected to the rectifier and filter module. The key feature is the inclusion of an EMC module with an integrated surge suppression circuit. The input terminal of the EMC module is connected to a power supply, and the output terminal is connected to the rectifier and filter module. The surge suppression circuit suppresses inrush current and rapidly discharges the relays within the EMC module. Its effect is that by improving the controller on the shielded circulating pump and adding a surge suppression circuit to the controller's EMC module to suppress inrush current and rapidly discharge the relays within the EMC module, it is beneficial for suppressing current surges and for reducing power consumption through the activation and deactivation of the relays.

Description

Technical Field

[0001] This utility model relates to the field of water pump controllers, and in particular to a water pump controller with low standby power consumption. Background Technology

[0002] Canned motorized circulating pumps are widely used in home heating systems and are one of the most important components of such systems. They need to run continuously throughout the year, making them often the most energy-consuming equipment in a household.

[0003] Due to the widespread use of heating systems in the EU market, the overall energy consumption is enormous. The new European Energy Efficiency Directive (ErP) regulations on standby power consumption were officially published on April 18, 2023, took effect on May 9, 2023, and will be mandatory from May 9, 2025. Although no specific requirements were made for circulating pumps, given the requirements of European heat pump manufacturers such as Bosch and Vaillant, it is expected that requirements for circulating pumps will be introduced over time, requiring manufacturers to design more energy-efficient products. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems existing in the prior art by providing a water pump controller. A surge suppression circuit is added to the EMC module to suppress surge current and quickly discharge the relays in the EMC module. This is beneficial for suppressing current surges and for reducing power consumption through the activation and deactivation of the relays.

[0005] The above-mentioned technical objectives of this utility model are mainly achieved through the following technical solutions:

[0006] A water pump controller includes a main control chip, a rectifier and filter module electrically and signal-connected to the main control chip, and an EMC module electrically connected to the rectifier and filter module. The controller is characterized by further including an EMC module, wherein the EMC module integrates a surge suppression circuit, the input terminal of the EMC module is used to connect to a power supply, the output terminal of the EMC module is used to connect to the rectifier and filter module, and the surge suppression circuit is used to suppress surge current and rapidly discharge relays in the EMC module.

[0007] The difference between this technical solution and the existing technology is that a surge suppression circuit is added to the EMC module to suppress surge current and quickly discharge the relays in the EMC module. This is beneficial for suppressing current surges and for reducing power consumption through the activation and deactivation of the relays.

[0008] In other words, when the water pump is in standby mode, the surge suppression circuit is in surge protection mode when the controller is powered on. If the controller does not receive a start command thereafter, the water pump will remain in standby mode. However, once the controller receives a start command, it activates the relay in the EMC module, and the water pump starts. Conversely, the controller deactivates the relay in the EMC module. Therefore, the activation and deactivation of the relays reduce power consumption, while the surge suppression circuit suppresses surge current, protecting the components in the controller to ensure stable and normal operation and preventing damage from surge current.

[0009] As a further improvement and supplement to the above technical solution, the present invention adopts the following technical measures:

[0010] Preferably, the surge suppression circuit includes:

[0011] Power input terminal;

[0012] Controllable switching components: their input terminals are connected to the power input terminals;

[0013] Surge suppression components: connected in parallel with the controllable switching components;

[0014] Control circuit: configured to control the conduction and cutoff of the controllable switching components according to the input signal, so as to switch the circuit operating state.

[0015] Preferably, the controllable switching components are a relay K1 and a diode D5, with the anode of the diode D5 connected to pin 4 of the relay K1 and the cathode connected to pin 3 of the relay K1.

[0016] The control circuit includes a transistor Q3. The base of the transistor Q3 receives the PWMICL control signal through a resistor R7, the emitter is grounded, and the collector is connected to the positive terminal of the coil of the relay K1 through a resistor R6.

[0017] The surge suppression component includes a thermistor PTC1, and the two ends of the thermistor PTC1 are connected to pin 1 and pin 2 of the relay K1, respectively.

[0018] Preferably, the EMC module includes:

[0019] Power supply unit: used to introduce power to the live wire (L) and neutral wire (N);

[0020] Overcurrent protection components: connected in series in the live wire power supply circuit to limit abnormal overcurrent;

[0021] Voltage clamping components: connected in parallel between the live wire L and the neutral wire N, used to absorb instantaneous high voltage;

[0022] Current limiting components: connected in series in the live wire power supply circuit to assist in overcurrent protection;

[0023] Differential mode filter components: connected in parallel between the live wire L and the neutral wire N, used to filter out differential mode interference;

[0024] Common-mode noise suppression components: connected in series in the power supply circuit between the live wire and the neutral wire, used to suppress common-mode noise;

[0025] Secondary filtering and safety components: connected to the output side of the common-mode inductor for further filtering and safety protection.

[0026] As a preferred embodiment, the first technical solution of the EMC module is: the power input unit is a connector CON6, with pin 2 connected to the neutral wire N and pin 3 connected to the live wire L;

[0027] The overcurrent protection component is fuse F1, which is connected in series with the output terminal of the live wire L of connector CON6;

[0028] The voltage clamping component is a varistor ZNR1, which is connected in parallel between the live wire L and the neutral wire N;

[0029] The current-limiting component is a thermistor PTC1, which is connected in series in the circuit on the output side of fuse F1;

[0030] The differential mode filter component is capacitor X C1, which is connected in parallel between the live wire L and the neutral wire N on the output side of the thermistor PTC1.

[0031] The common-mode noise suppression component is a common-mode inductor L1, whose first winding is connected in series with the thermistor PTC1, and whose second winding is connected in series with the live wire L on the output side of the fuse F1.

[0032] The secondary filter component is capacitor C4, which is connected in parallel to the output side of common-mode inductor L1;

[0033] The safety protection components are Y capacitors Y1 and Y2 connected in series, and the series-connected Y capacitors Y1 and Y2 are connected in parallel to the output side of common-mode inductor L1.

[0034] As a preferred option, the second technical solution for the EMC module is:

[0035] The power input unit is connector CON6, with pin 2 connected to the neutral wire N and pin 3 connected to the live wire L;

[0036] The differential mode filter component is capacitor X C1, which is connected in parallel between the live wire L and the neutral wire N;

[0037] The overcurrent protection component is fuse F1, which is located on the output side of capacitor C1 and connected in series with the live wire L of connector CON6.

[0038] The voltage clamping component is a varistor ZNR1, which is connected in parallel between the live wire L and the neutral wire N;

[0039] The current-limiting component is a thermistor PTC2, which is connected in series in the circuit on the output side of fuse F1;

[0040] The common-mode noise suppression components are common-mode inductors L1 and L2. The first winding of common-mode inductor L1 is connected in series with the neutral line N on the output side of the thermistor PTC2, and the second winding is connected in series with the live line L on the input side of the fuse F1. The first winding of common-mode inductor L2 is connected in series with the neutral line N on the input side of the thermistor PTC2, and the second winding is connected in series with the live line L on the output side of the fuse F1.

[0041] The secondary filter component is capacitor C4, which is connected in parallel to the output side of common-mode inductor L1;

[0042] The safety protection components are Y capacitors Y1 and Y2 connected in series, and the series-connected Y capacitors Y1 and Y2 are connected in parallel to the output side of common-mode inductor L1.

[0043] In this technical solution, a common-mode inductor L1, a common-mode inductor L2, and a thermistor PTC2 are used to form an ABBA circuit with an "X capacitor-inductor-inductor-X capacitor". X capacitors C1 and C4 are connected on both sides of the common-mode inductors L1 and L2, respectively, forming a symmetrical structure. This design helps to balance parasitic parameters in the circuit and reduce additional interference caused by asymmetrical component layout. At the same time, the symmetrical design can improve the self-resonant frequency of the filter and broaden the effective filtering range.

[0044] Furthermore, by eliminating the resistor string (including at least resistors RX1, RX2, and RX3), power consumption generated by the resistor string is avoided, which further facilitates the low-power operation of the controller.

[0045] Preferably, in the first technical solution, the surge suppression circuit further includes: a plurality of resistor strings connected in series, the two ends of which are connected between the live wire L1 and the neutral wire N1 on the output side of the safety protection component.

[0046] Preferably, the relay K1 is a time-delay relay with a time-delay disconnection function, or the relay K1 is connected to a time-delay module, and the time-delay module is used to make the relay K1 disconnect after a time delay.

[0047] Preferably, the water pump controller also includes an auxiliary power supply module, which supplies power to the main control chip, the EMC module, and the rectifier and filter module. The auxiliary power supply module includes a BUCK circuit with a step-down chopper configuration. This step-down chopper circuit allows the auxiliary power supply module to enter a discontinuous conduction mode (DCM mode), which effectively reduces losses in related components and core losses in the controller, thereby optimizing standby power consumption.

[0048] Preferably, the BUCK circuit with buck chopper form includes:

[0049] Power chip U6: It has a DC input port for introducing initial electrical energy;

[0050] Feedback regulation unit: It is connected to the power chip and performs sampling, filtering and compensation of output voltage / current;

[0051] Power conversion unit: It is connected to the power chip and feedback regulation unit to complete the boost / buck conversion of power and output a stable DC voltage to power the load;

[0052] Auxiliary control unit: connected to the power chip and the power conversion unit, used to control the power conversion power, optimize the high-frequency characteristics of the circuit, and protect the circuit components.

[0053] The beneficial effects of this utility model are as follows: 1. A surge suppression circuit is added to the EMC module to suppress surge current and quickly discharge the relays in the EMC module. This is beneficial for suppressing current surges and reducing power consumption through the activation and deactivation of the relays. 2. At least two technical solutions for combining the EMC module with the surge suppression circuit are adopted. A “X capacitor-inductor-inductor-X capacitor” ABBA circuit is formed by combining resistor strings (RX1, RX2, RX3) with a thermistor PTC1, or by using common-mode inductors (L1, L2). Two X capacitors (C1, C4) are connected to both sides of the inductor to form a symmetrical structure. A thermistor PTC2 is used to effectively suppress current surges. 3. The rectifier and filter module adds a power frequency inductor L3 to attenuate the low-frequency ripple after rectification, while also providing dual suppression of residual switching noise and blocking high-frequency interference. 4. A LIN communication circuit that meets the low-power design requirements is achieved through dynamic power management of “on-demand power supply”. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the structure of the various modules in the water pump controller involved in this utility model.

[0055] Figure 2This is a schematic diagram of the circuit structure of an auxiliary power supply module involved in this utility model.

[0056] Figure 3 This is a schematic diagram of a circuit structure involving the EMC module, surge suppression circuit, and rectifier filter module of this utility model.

[0057] Figure 4 This is a schematic diagram of another circuit structure involving the EMC module, surge suppression circuit and rectifier filter module of this utility model.

[0058] Figure 5 This utility model relates to a circuit structure diagram of a LIN communication module. Detailed Implementation

[0059] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0060] Example: Figures 1-5 As shown (in) Figure 1 In the diagram, M represents an electric motor. A water pump controller includes a main control chip, a rectifier and filter module electrically and signal-connected to the main control chip, and an EMC module electrically connected to the rectifier and filter module. The controller is characterized by further including an EMC module, wherein the EMC module integrates a surge suppression circuit. The input terminal of the EMC module is used to connect to a power supply, and the output terminal of the EMC module is used to connect to the rectifier and filter module. The surge suppression circuit is used to suppress surge current and rapidly discharge relays in the EMC module.

[0061] The difference between this technical solution and the existing technology is that a surge suppression circuit is added to the EMC module to suppress surge current and quickly discharge the relays in the EMC module. This is beneficial for suppressing current surges and for reducing power consumption through the activation and deactivation of the relays.

[0062] In other words, when the water pump is in standby mode, the surge suppression circuit is in surge protection mode when the controller is powered on. If the controller does not receive a start command thereafter, the water pump will remain in standby mode. However, once the controller receives a start command, it activates the relay in the EMC module, and the water pump starts. Conversely, the controller deactivates the relay in the EMC module. Therefore, the activation and deactivation of the relays reduce power consumption, while the surge suppression circuit suppresses surge current, protecting the components in the controller to ensure stable and normal operation and preventing damage from surge current.

[0063] In addition, bidirectional suppression (input / output interference) is achieved through EMC modules and rectifier filter modules, avoiding electromagnetic interference mainly conducted through power lines, while reducing the standby power consumption of the motor.

[0064] To facilitate human-machine interaction, a human-machine interface module that communicates with the main control chip is also included in the water pump controller. This module provides feedback on the current status of the water pump, and the interactive functionality can be achieved by controlling multiple LED lights.

[0065] In order to sample data from the motor on the water pump, the main control chip samples the UVW current output from the IPM full-bridge inverter module through a sampling module. Internally, it outputs three complementary drive signals (such as UH, UL, VH, VL, WH, WL) to the IPM full-bridge inverter module through the FOC algorithm, thereby completing the control of the water pump. The main control chip is connected to a communication module, which adopts a LIN communication circuit.

[0066] Next, further improvements and additions to the above technical solution will be made:

[0067] In practical applications, the surge suppression circuit includes:

[0068] Power input terminal;

[0069] Controllable switching components: their input terminals are connected to the power input terminals;

[0070] Surge suppression components: connected in parallel with the controllable switching components;

[0071] Control circuit: configured to control the conduction and cutoff of the controllable switching components according to the input signal, so as to switch the circuit operating state.

[0072] In practical applications, the controllable switching components are relay K1 and diode D5. The anode of diode D5 is connected to pin 4 of relay K1, and the cathode is connected to pin 3 of relay K1.

[0073] The control circuit includes a transistor Q3. The base of the transistor Q3 receives the PWMICL control signal through a resistor R7, the emitter is grounded, and the collector is connected to the positive terminal of the coil of the relay K1 through a resistor R6.

[0074] The surge suppression component includes a thermistor PTC1, and the two ends of the thermistor PTC1 are connected to pin 1 and pin 2 of the relay K1, respectively.

[0075] In practical applications, the EMC module includes:

[0076] Power supply unit: used to introduce power to the live wire (L) and neutral wire (N);

[0077] Overcurrent protection components: connected in series in the live wire power supply circuit to limit abnormal overcurrent;

[0078] Voltage clamping components: connected in parallel between the live wire L and the neutral wire N, used to absorb instantaneous high voltage;

[0079] Current limiting components: connected in series in the live wire power supply circuit to assist in overcurrent protection;

[0080] Differential mode filter components: connected in parallel between the live wire L and the neutral wire N, used to filter out differential mode interference;

[0081] Common-mode noise suppression components: connected in series in the power supply circuit between the live wire and the neutral wire, used to suppress common-mode noise;

[0082] Secondary filtering and safety components: Connected to the output side of the common-mode inductor, they provide further filtering and safety protection. In other words, the safety components are connected in parallel with the common-mode inductor to serve as common-mode filters.

[0083] In practical applications, the EMC module has at least two implementable technical solutions, wherein the first technical solution (such as...) Figure 3 As shown below:

[0084] The power input unit is connector CON6, with pin 2 connected to the neutral wire N and pin 3 connected to the live wire L;

[0085] The overcurrent protection component is fuse F1, which is connected in series with the output terminal of the live wire L of connector CON6;

[0086] The voltage clamping component is a varistor ZNR1, which is connected in parallel between the live wire L and the neutral wire N;

[0087] The current limiting component is a thermistor PTC1 (that is, the thermistor PTC1 is both a surge suppression component and a current limiting component, and the surge suppression circuit is associated with the EMC module through the thermistor PTC1), which is connected in series in the circuit on the output side of fuse F1.

[0088] The differential mode filter component is capacitor X C1, which is connected in parallel between the live wire L and the neutral wire N on the output side of the thermistor PTC1.

[0089] The common-mode noise suppression component is a common-mode inductor L1, whose first winding is connected in series with the thermistor PTC1, and whose second winding is connected in series with the live wire L on the output side of the fuse F1.

[0090] The secondary filter component is capacitor C4, which is connected in parallel to the output side of common-mode inductor L1;

[0091] The safety protection components are Y capacitors Y1 and Y2 connected in series, and the series-connected Y capacitors Y1 and Y2 are connected in parallel to the output side of common-mode inductor L1.

[0092] In practical applications, when the relay is energized, the thermistor PTC1 will be short-circuited.

[0093] In practical applications, the surge suppression circuit further includes: a number of resistor strings connected in series, with the two ends of the resistor strings connected between the live wire L1 and the neutral wire N1 on the output side of the safety protection component.

[0094] The second technical solution (such as) Figure 4 As shown in the diagram: the power input unit is connector CON6, with pin 2 connected to the neutral wire N and pin 3 connected to the live wire L;

[0095] The differential mode filter component is capacitor X C1, which is connected in parallel between the live wire L and the neutral wire N;

[0096] The overcurrent protection component is fuse F1, which is located on the output side of capacitor C1 and connected in series with the live wire L of connector CON6.

[0097] The voltage clamping component is a varistor ZNR1, which is connected in parallel between the live wire L and the neutral wire N;

[0098] The current limiting component is the thermistor PTC2 (that is, the thermistor PTC1 is both a surge suppression component and a current limiting component, and the surge suppression circuit is associated with the EMC module through the thermistor PTC1), which is connected in series in the circuit on the output side of the fuse F1.

[0099] The common-mode noise suppression components are common-mode inductors L1 and L2. The first winding of common-mode inductor L1 is connected in series with the neutral line N on the output side of the thermistor PTC2, and the second winding is connected in series with the live line L on the input side of the fuse F1. The first winding of common-mode inductor L2 is connected in series with the neutral line N on the input side of the thermistor PTC2, and the second winding is connected in series with the live line L on the output side of the fuse F1.

[0100] The secondary filter component is capacitor C4, which is connected in parallel to the output side of common-mode inductor L1;

[0101] The safety protection components are Y capacitors Y1 and Y2 connected in series, and the series-connected Y capacitors Y1 and Y2 are connected in parallel to the output side of common-mode inductor L1.

[0102] The difference between the first and second technical solutions lies in:

[0103] In the first technical solution, there is a common-mode inductor L1, a thermistor PTC1, and a resistor string (including at least resistors RX1, RX2, and RX3). The multiple resistors (RX1, RX2, and RX3) can suppress surge current and rapidly discharge relay K1; in order to maintain low power consumption, the relay is disconnected when the motor is not running.

[0104] In the second technical solution, there are common-mode inductors L1 and L2, and a thermistor PTC2. In this technical solution, since the resistor string (including at least resistors RX1, RX2, and RX3) is eliminated, the power consumption generated by the resistor string is avoided, which further facilitates the low-power operation of the controller.

[0105] In this technical solution, a common-mode inductor L1, a common-mode inductor L2, and a thermistor PTC2 are used to form an ABBA circuit with an "X capacitor-inductor-inductor-X capacitor". X capacitors C1 and C4 are connected on both sides of the common-mode inductors L1 and L2, respectively, forming a symmetrical structure. This design helps to balance parasitic parameters in the circuit and reduce additional interference caused by asymmetrical component layout. At the same time, the symmetrical design can improve the self-resonant frequency of the filter and broaden the effective filtering range.

[0106] Furthermore, the location of capacitor C1 differs in the first and second technical solutions.

[0107] For thermistors PTC1 and PTC2, the resistance values ​​of thermistors PTC1 and PTC2 have the following relationship:

[0108] R PTC2 >R PTC1 R is preferred. PTC2 ≥3R PTC1 This helps to avoid a decrease in surge current suppression capability due to the lack of a discharge resistor, and is beneficial for suppressing surge current.

[0109] In practical applications, the relay K1 is a time-delay relay with a time-delay disconnection function, or the relay K1 is connected to a time-delay module, and the time-delay module is used to make the relay K1 disconnect after a time delay.

[0110] In this technical solution, when the controller is applied to the water pump and the water pump is in standby mode, the relay K1 is not energized; when a start command is received, the relay K1 is energized first and then the water pump is started; when the water pump is stopped, a delay is set to disconnect the relay K1, preferably more than 5 seconds; and the relay K1 is disconnected after standby and shutdown to achieve low power consumption.

[0111] For both the first and second technical solutions, the varistor ZNR1 is used for voltage clamping when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive devices. X capacitors (C1, C4) are connected across the live and neutral wires respectively to filter differential-mode interference. Y capacitors (Y1, Y2) are connected between the live / neutral wires and ground respectively to filter common-mode interference. The common-mode inductor L1, in conjunction with the X and Y capacitors, improves electromagnetic compatibility by suppressing common-mode noise.

[0112] In practical applications, the water pump controller also includes an auxiliary power supply module, which supplies power to the main control chip, the EMC module, and the rectifier and filter module.

[0113] In practical applications, if the controller has other loads that require power supply, they can also be powered by the auxiliary power module. The auxiliary power module is equipped with a BUCK circuit in the form of a step-down chopper to provide the DC power required by the power chip.

[0114] In this technical solution, the auxiliary power module can enter the intermittent conduction mode (DCM mode) through the BUCK circuit with step-down chopping form. The DCM mode can effectively reduce the loss of related components and magnetic core loss in the controller, thereby optimizing standby power consumption.

[0115] In practical applications, the BUCK circuit with buck chopper form includes:

[0116] Power chip U6: It has a DC input port for introducing initial electrical energy (or connecting DC input voltage).

[0117] Feedback regulation unit: It is connected to the power chip and performs sampling, filtering and compensation of output voltage / current;

[0118] Power conversion unit: It is connected to the power chip and feedback regulation unit to complete the boost / buck conversion of power and output a stable DC voltage to power the load;

[0119] Auxiliary control unit: connected to the power chip and the power conversion unit, used to control the power conversion power, optimize the high-frequency characteristics of the circuit, and protect the circuit components.

[0120] The feedback adjustment unit includes a resistor R58 and a capacitor C15 connected in parallel. The second resistor R58 and capacitor C15 form an RC network, connected to the FB pin of the power chip U6 and the circuit node, for feedback adjustment or filtering. Capacitor C15 and resistor R58 work together to achieve signal filtering or compensation.

[0121] The power conversion unit includes an inductor L2, a Schottky diode D1, and a capacitor C14.

[0122] The auxiliary control unit includes resistor R14, capacitor C39, and diode D7. The first resistor R14 is connected between the relevant output pins of chip U6 and the circuit node, and serves as a voltage divider or current limiter.

[0123] In this embodiment, the power supply chip U6 can be a BPA8506D chip. When the senseFET (sensing field-effect transistor) inside the power supply chip U6 is turned on, pins 5, 6, 7, and 8 of the power supply chip U6 charge inductor L2, capacitor C14, capacitor C15, and capacitor C39, and store energy in inductor L2. At this time, the current in the auxiliary power module increases linearly.

[0124] In the auxiliary power supply module, diode D7 is used for rectification, capacitor C14 is used for filtering, and resistors R14 and R58 are used for voltage division and feedback.

[0125] When the right end of inductor L2 (such as...) Figure 2 As shown (the right side corresponds to the right end of the paper), when the voltage is greater than the regulated voltage and diode D7 is conducting, the voltage division of resistors R14 and R58 is both greater than 1.65V. Therefore, the senseFET is turned off, and the voltage output is stable (as shown in the image). Figure 2 As mentioned above, the leads at both ends of capacitor C14 are the voltage output terminals of the BUCK circuit, serving as the output of the auxiliary power supply. Inductor L2 freewheels through diode D1, and the current gradually decreases (that is, when the senseFET in power chip U6 is turned off, the current freewheels through inductor L2, capacitor C14, and Schottky diode D1). When the current in inductor L2 reaches 0A, it will remain at 0A, and at this time the output current is maintained solely by the output capacitor.

[0126] In practical applications, the rectifier and filter module includes a rectifier bridge DB1, a power frequency inductor L3, electrolytic capacitors E1 and E2 connected in parallel and in series with the power frequency inductor L3, and a Y capacitor Y3.

[0127] The rectifier bridge DB1 converts alternating current into pulsating direct current.

[0128] The power frequency inductor L3 is connected to the output terminals (pins 1 and 4) of the rectifier bridge DB1. By using power frequency inductor L3, the low-frequency ripple after rectification is attenuated. Power frequency inductor L3 uses a ferrite or silicon steel core, which allows it to maintain linear operation under pulsating current and, due to its high saturation flux density, can carry a large DC bias current, thus avoiding the degradation of filtering performance caused by core saturation and improving the EMI suppression stability of the system over a wide load range.

[0129] Y capacitor Y3 (its connection method and function are the same as those of Y capacitor Y1 and Y capacitor Y2).

[0130] Electrolytic capacitors E1 and E2 store energy and smooth the rectified DC power, reducing voltage ripple and providing stable energy for subsequent circuits.

[0131] In addition, the power frequency inductor L3, together with electrolytic capacitors E1 and E2, forms an LC topology, which provides dual suppression of residual switching noise after rectification. The layout characteristics of being connected in series in the DC main path can also block high-frequency interference from being reverse-coupled to the front-end circuit through the power line.

[0132] In practical applications, the main control chip is also connected to a communication module. In this embodiment, a LIN communication module is preferred.

[0133] In practical applications, such as Figure 5 As shown, the LIN communication module includes a transceiver chip U10, a receiving module, a transmitting module, a transceiver chip configuration module, and an interface protection module connected to the transceiver chip U10.

[0134] The receiving module includes RX1 connected to the MCU, transistors Q5 and Q4, optocoupler PC3, and LED3. In the receiving module, when pin 1 (TX1) of the transceiver chip U10 is low, optocoupler PC3 is not conducting, transistor Q5 is conducting, and the signal at pin 1 of the transceiver chip U10 is low. Conversely, when pin 1 of the transceiver chip U10 is high, optocoupler PC3 is conducting, transistor Q5 is not conducting, and the signal at pin 1 of the transceiver chip U10 is high.

[0135] The transmitting module includes TX1, transistor Q1, and optocoupler PC2, all connected to the MCU. In this module, through optocoupler PC2 and transistor Q1, when the main control chip is not transmitting a signal (i.e., when pin 4 (TX4) of transceiver chip U10 is high), transistor Q1 is cut off, optocoupler PC2 is inactive, and pin 4 of transceiver chip U10 receives a high level. This ensures the normal operation of the communication circuit and achieves dynamic power management through "on-demand power supply" (i.e., when the water pump is in standby mode, surge current is suppressed by the surge suppression circuit upon power-up to prevent surges; then, if no start command is received, the water pump remains in standby mode; once a start command is received, the relay engages, and the water pump starts). This meets the low-power design requirements of the LIN communication circuit.

[0136] The transceiver chip configuration module (or level conversion chip configuration circuit) includes a Zener diode D2 and several resistors and capacitors (in... Figure 5In the transceiver chip configuration module, select several resistors and capacitors. Within the transceiver chip configuration module, configure the voltage levels of pins 2 and 3 of U10 so that U10 automatically wakes up upon power-up, switching from the default sleep mode to standard mode.

[0137] The interface protection circuit includes transient voltage suppression diodes TVS2, TVS4, and TVS5, diode D1, and inductors L7, L8, and L9. In interface receive protection, these diodes, along with inductors L7, L8, and L9, protect the interface circuit. Diode D1 is also added to prevent reverse connection.

[0138] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Various modifications and variations can be made to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A water pump controller comprising a main control chip, a rectification filtering module in electrical and signal connection with the main control chip, and an EMC module in electrical connection with the rectification filtering module, characterized in that It also includes an EMC module, which integrates a surge suppression circuit. The input terminal of the EMC module is used to connect to the power supply, and the output terminal of the EMC module is used to connect to the rectifier and filter module. The surge suppression circuit is used to suppress surge current and quickly discharge the relays in the EMC module.

2. The water pump controller according to claim 1, characterized in that... The surge suppression circuit includes: Power input terminal; Controllable switching components: their input terminals are connected to the power input terminals; Surge suppression components: connected in parallel with the controllable switching components; Control circuit: configured to control the conduction and cutoff of the controllable switching components according to the input signal, so as to switch the circuit operating state.

3. The water pump controller according to claim 2, characterized in that: The controllable switching components are a relay K1 and a diode D5. The diode D5 is connected to pin 4 of the relay K1, and its cathode is connected to pin 3 of the relay K1. The control circuit includes a transistor Q3. The base of the transistor Q3 receives the PWM ICL control signal through a resistor R7, the emitter is grounded, and the collector is connected to the positive terminal of the coil of the relay K1 through a resistor R6. The surge suppression component includes a thermistor PTC1, and the two ends of the thermistor PTC1 are connected to pin 1 and pin 2 of the relay K1, respectively.

4. The water pump controller according to claim 1, 2, or 3, characterized in that... The EMC module includes: Power supply unit: used to introduce power to the live wire (L) and neutral wire (N); Overcurrent protection components: connected in series in the live wire power supply circuit to limit abnormal overcurrent; Voltage clamping components: connected in parallel between the live wire L and the neutral wire N, used to absorb instantaneous high voltage; Current limiting components: connected in series in the live wire power supply circuit to assist in overcurrent protection; Differential mode filter components: connected in parallel between the live wire L and the neutral wire N, used to filter out differential mode interference; Common-mode noise suppression components: connected in series in the power supply circuit between the live wire and the neutral wire, used to suppress common-mode noise; Secondary filtering and safety components: connected to the output side of the common-mode inductor for further filtering and safety protection.

5. The water pump controller according to claim 4, characterized in that: The power input unit is connector CON6, with pin 2 connected to the neutral wire N and pin 3 connected to the live wire L; The overcurrent protection component is fuse F1, which is connected in series with the output terminal of the live wire L of connector CON6; The voltage clamping component is a varistor ZNR1, which is connected in parallel between the live wire L and the neutral wire N; The current-limiting component is a thermistor PTC1, which is connected in series in the circuit on the output side of fuse F1; The differential mode filter component is capacitor X C1, which is connected in parallel between the live wire L and the neutral wire N on the output side of the thermistor PTC1. The common-mode noise suppression component is a common-mode inductor L1, whose first winding is connected in series with the thermistor PTC1, and whose second winding is connected in series with the live wire L on the output side of the fuse F1. The secondary filter component is capacitor C4, which is connected in parallel to the output side of common-mode inductor L1; The safety protection components are Y capacitors Y1 and Y2 connected in series, and the series-connected Y capacitors Y1 and Y2 are connected in parallel to the output side of common-mode inductor L1.

6. The water pump controller according to claim 4, characterized in that: The power input unit is connector CON6, with pin 2 connected to the neutral wire N and pin 3 connected to the live wire L; The differential mode filter component is capacitor X C1, which is connected in parallel between the live wire L and the neutral wire N; The overcurrent protection component is fuse F1, which is located on the output side of capacitor C1 and connected in series with the live wire L of connector CON6. The voltage clamping component is a varistor ZNR1, which is connected in parallel between the live wire L and the neutral wire N; The current-limiting component is a thermistor PTC2, which is connected in series in the circuit on the output side of fuse F1; The common-mode noise suppression components are common-mode inductors L1 and L2. The first winding of common-mode inductor L1 is connected in series with the neutral line N on the output side of the thermistor PTC2, and the second winding is connected in series with the live line L on the input side of the fuse F1. The first winding of common-mode inductor L2 is connected in series with the neutral line N on the input side of the thermistor PTC2, and the second winding is connected in series with the live line L on the output side of the fuse F1. The secondary filter component is capacitor C4, which is connected in parallel to the output side of common-mode inductor L1; The safety protection components are Y capacitors Y1 and Y2 connected in series, and the series-connected Y capacitors Y1 and Y2 are connected in parallel to the output side of common-mode inductor L1.

7. The water pump controller according to claim 5, characterized in that... The surge suppression circuit further includes: a plurality of resistor strings connected in series, the two ends of which are connected between the live wire L1 and the neutral wire N1 on the output side of the safety protection component.

8. The water pump controller according to claim 3, characterized in that... The relay K1 is a time-delay relay with a time-delay disconnection function, or the relay K1 is connected to a time-delay module, and the time-delay module is used to make the relay K1 disconnect after a time delay.

9. The water pump controller according to claim 1, 2, or 3, characterized in that... It also includes an auxiliary power supply module, which supplies power to the main control chip, the EMC module and the rectifier and filter module. The auxiliary power supply module is equipped with a BUCK circuit with a step-down chopper form.

10. The water pump controller according to claim 9, characterized in that... The BUCK circuit with buck chopper configuration includes: Power chip U6: It has a DC input port for introducing initial electrical energy; Feedback regulation unit: It is connected to the power chip and performs sampling, filtering and compensation of output voltage / current; Power conversion unit: It is connected to the power chip and feedback regulation unit to complete the boost / buck conversion of power and output a stable DC voltage to power the load; Auxiliary control unit: connected to the power chip and the power conversion unit, used to control the power conversion power, optimize the high-frequency characteristics of the circuit, and protect the circuit components.

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