Water pump soft starter circuit

Abstract

The embodiment of the utility model discloses a water pump soft starter circuit. The water pump soft starter circuit comprises a water pressure sensor; the first water pump starting circuit is connected with the water pressure sensor; wherein the first water pump starting circuit comprises a reference voltage end V1, a reference voltage end V3, an input voltage end V2, an output voltage end V4, a resistor R1, a resistor R2, a diode D1, a diode D2, a voltage-regulator tube Dz, an operational amplifier A1, an operational amplifier A2, a resistor R28, a resistor R29, a resistor R22, a resistor R11, a resistor R3, a resistor R6, a capacitor C12, a field effect transistor Q1, a triode Q2, a silicon controlled rectifier SCR1, a power supply P1 and a motor M1. The water pressure sensor is directly connected to the water pump starting circuit, and the water pump starting circuit judges the water pressure range and automatically starts or stops operation of the water pump.

Description

Technical Field

[0001] The utility model relates to the technical field of water pump soft starters, in particular to a water pump soft starter circuit. Background Art

[0002] In some water pump systems, when the water pressure parameter reaches the set value, the water pump needs to stop working to prevent the water pump from continuing to run and causing the water pressure to exceed the safety value and damage related equipment, causing safety accidents. The current control system adopts the method that the water pressure sensor transmits the water pressure information to the monitoring device, and the monitoring device sends the start and stop signal to the soft starter according to the water pressure situation, starts or stops the soft starter to control whether the water pump is running, so as to control the water pressure to always keep it within the safe pressure range, thereby ensuring the safe and stable operation of the water supply system.

[0003] The water pressure information is transmitted to the monitoring device through the sensor, and the soft starter is started and stopped through the monitoring device. However, it has the disadvantages of high cost and complex circuit. Utility Model Content

[0004] The utility model provides a water pump soft starter circuit, which directly connects a water pressure sensor to a soft starter (water pump starting circuit). The soft starter determines the water pressure range and automatically starts or stops the water pump.

[0005] The embodiment of this specification discloses a water pump soft starter circuit, including:

[0006] Water pressure sensor;

[0007] A first water pump starting circuit connected to the water pressure sensor;

[0008] Wherein, the first water pump starting circuit includes a reference voltage terminal V1, a reference voltage terminal V3, an input voltage terminal V2, an output voltage terminal V4, a resistor R1, a resistor R2, a diode D1, a diode D2, a voltage regulator Dz, an operational amplifier A1, an operational amplifier A2, a resistor R28, a resistor R29, a resistor R22, a resistor R11, a resistor R3, a resistor R6, a capacitor C12, a field effect tube Q1, a triode Q2, a thyristor SCR1, a power supply P1 and a motor M1;

[0009] The voltage signal output terminal of the water pressure sensor is connected to the input voltage terminal V2, the reference voltage terminal V1 is connected to the inverting terminal of the operational amplifier A1, the input voltage terminal V2 is connected to the non-inverting terminal of the operational amplifier A1 and the inverting terminal of the operational amplifier A2, the reference voltage terminal V3 is connected to the non-inverting terminal of the operational amplifier A2, the output terminal of the operational amplifier A1 is connected to the positive electrode of the diode D1, the output terminal of the operational amplifier A2 is connected to the positive electrode of the diode D2, the negative electrode of the diode D1 is connected to the negative electrode of the diode D2 and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R2, the negative electrode of the voltage regulator Dz and the output voltage terminal V4, and the other end of the resistor R2 is connected to the positive electrode of the voltage regulator Dz and then grounded;

[0010] One end of the resistor R28 is connected to the output voltage terminal V4, the other end of the resistor R28 is connected to one end of the resistor R29 and the base of the transistor Q2, the other end of the resistor R29 is connected to the emitter of the transistor Q2 and then grounded, the collector of the transistor Q2 is connected to one end of the resistor R22, the other end of the resistor R22 is connected to the G pole of the field effect transistor Q1, one end of the capacitor C12 and one end of the resistor R11, the other end of the resistor R11 is connected to the other end of the capacitor C12 and the S pole of the field effect transistor Q1 and then connected to the external voltage terminal Vcc, the D pole of the field effect transistor Q1 is connected to one end of the resistor R6 and then connected to the external voltage terminal Vcc, the other end of the resistor R6 is connected to the control pole of the thyristor SCR1, and the first anode of the thyristor SCR1, the power supply P1, the motor M1 and the second anode of the thyristor SCR1 are connected in series to form a loop.

[0011] In some embodiments of this specification, the model of the field effect tube Q1 is AO3401, and the model of the transistor Q2 is S8050.

[0012] In some embodiments of the present specification, the thyristor SCR1 is a bidirectional thyristor.

[0013] The embodiment of this specification also discloses a water pump soft starter circuit, including:

[0014] Water pressure sensor;

[0015] A second water pump starting circuit connected to the water pressure sensor;

[0016] Wherein, the second water pump starting circuit includes a reference voltage terminal V1, a reference voltage terminal V3, an input voltage terminal V2, an output voltage terminal V4, a resistor R1, a resistor R2, a diode D1, a diode D2, a voltage regulator Dz, an operational amplifier A1, an operational amplifier A2, a resistor R28, a resistor R29, a resistor R22, a resistor R11, a resistor R3, a resistor R6, a capacitor C12, a field effect transistor Q1, a transistor Q2, a resistor R1, a resistor R4, a resistor R5, a resistor R7, a transistor Q3, an optocoupler U1, a thyristor SCR3, a capacitor C1, a power supply P3 and a motor M3;

[0017] The voltage signal output terminal of the water pressure sensor is connected to the input voltage terminal V2, the reference voltage terminal V1 is connected to the inverting terminal of the operational amplifier A1, the input voltage terminal V2 is connected to the non-inverting terminal of the operational amplifier A1 and the inverting terminal of the operational amplifier A2, the reference voltage terminal V3 is connected to the non-inverting terminal of the operational amplifier A2, the output terminal of the operational amplifier A1 is connected to the positive electrode of the diode D1, the output terminal of the operational amplifier A2 is connected to the positive electrode of the diode D2, the negative electrode of the diode D1 is connected to the negative electrode of the diode D2 and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R2, the negative electrode of the voltage regulator Dz and the output voltage terminal V4, and the other end of the resistor R2 is connected to the positive electrode of the voltage regulator Dz and then grounded;

[0018] One end of the resistor R28 is connected to the output voltage terminal V4, the other end of the resistor R28 is connected to one end of the resistor R29 and the base of the transistor Q2, the other end of the resistor R29 is connected to the emitter of the transistor Q2 and then grounded, the collector of the transistor Q2 is connected to one end of the resistor R22, the other end of the resistor R22 is connected to the G pole of the field effect transistor Q1, one end of the capacitor C12 and one end of the resistor R11, the other end of the resistor R11 is connected to the other end of the capacitor C12 and the S pole of the field effect transistor Q1 and then connected to the external voltage terminal Vcc, the D pole of the field effect transistor Q1 is connected to one end of the resistor R6 and then connected to the external voltage terminal Vcc, and the other end of the resistor R6 is connected to the base of the transistor Q3;

[0019] The emitter of the transistor Q3 is externally connected to the voltage terminal Vcc, the collector of the transistor Q3 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to pin 1 of the optocoupler U1, pin 2 of the optocoupler U1 is grounded, pin 3 of the optocoupler U1 is connected to one end of the resistor R4, pin 4 of the optocoupler U1 is connected to the control electrode of the thyristor SCR3 and one end of the resistor R5, the other end of the resistor R5 is connected to one end of the motor M3, one end of the resistor R7 and one end of the power supply P3, the other end of the motor M3 is connected to the first anode of the thyristor SCR3, the other end of the resistor R4 is connected to the second anode of the thyristor SCR3, one end of the capacitor C1 and the other end of the power supply P3, and the other end of the capacitor C1 is connected to the other end of the resistor R7.

[0020] In some embodiments of the present specification, the models of the transistor Q2 and the transistor Q3 are S8050, and the model of the field effect transistor Q1 is AO3401.

[0021] In some embodiments of this specification, the model of the optical coupler U1 is MOC3061.

[0022] In some embodiments of the present specification, the thyristor SCR1 and the thyristor SCR3 are bidirectional thyristors.

[0023] The embodiments of this specification can at least achieve the following beneficial effects:

[0024] Directly connect the water pressure sensor to the water pump starting circuit, determine the water pressure range through the water pump starting circuit, and start or stop the water pump automatically; simplify the circuit topology and improve reliability; reduce monitoring equipment and reduce system costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 Schematic diagram of operational amplifier A1 and operational amplifier A2 involved in some embodiments of the present utility model.

[0027] Figure 2 Schematic diagram of the field effect transistor Q1 and the triode Q2 involved in some embodiments of the present invention.

[0028] Figure 3 Schematic diagram of a thyristor SCR1 involved in some embodiments of the present invention.

[0029] Figure 4 It is a schematic diagram of the thyristor SCR3 involved in some embodiments of the utility model. DETAILED DESCRIPTION

[0030] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0031] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", 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 the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0034] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0036] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0037] like Figure 1 , Figure 2 and Figure 3 As shown, the embodiment of this specification discloses a water pump soft starter circuit, including:

[0038] Water pressure sensor;

[0039] A first water pump starting circuit connected to the water pressure sensor;

[0040] Wherein, the first water pump starting circuit includes a reference voltage terminal V1, a reference voltage terminal V3, an input voltage terminal V2, an output voltage terminal V4, a resistor R1, a resistor R2, a diode D1, a diode D2, a voltage regulator Dz, an operational amplifier A1, an operational amplifier A2, a resistor R28, a resistor R29, a resistor R22, a resistor R11, a resistor R3, a resistor R6, a capacitor C12, a field effect tube Q1, a triode Q2, a thyristor SCR1, a power supply P1 and a motor M1;

[0041] The voltage signal output terminal of the water pressure sensor is connected to the input voltage terminal V2, the reference voltage terminal V1 is connected to the inverting terminal of the operational amplifier A1, the input voltage terminal V2 is connected to the non-inverting terminal of the operational amplifier A1 and the inverting terminal of the operational amplifier A2, the reference voltage terminal V3 is connected to the non-inverting terminal of the operational amplifier A2, the output terminal of the operational amplifier A1 is connected to the positive electrode of the diode D1, the output terminal of the operational amplifier A2 is connected to the positive electrode of the diode D2, the negative electrode of the diode D1 is connected to the negative electrode of the diode D2 and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R2, the negative electrode of the voltage regulator Dz and the output voltage terminal V4, and the other end of the resistor R2 is connected to the positive electrode of the voltage regulator Dz and then grounded;

[0042] One end of the resistor R28 is connected to the output voltage terminal V4, the other end of the resistor R28 is connected to one end of the resistor R29 and the base of the transistor Q2, the other end of the resistor R29 is connected to the emitter of the transistor Q2 and then grounded, the collector of the transistor Q2 is connected to one end of the resistor R22, the other end of the resistor R22 is connected to the G pole of the field effect transistor Q1, one end of the capacitor C12 and one end of the resistor R11, the other end of the resistor R11 is connected to the other end of the capacitor C12 and the S pole of the field effect transistor Q1 and then connected to the external voltage terminal Vcc, the D pole of the field effect transistor Q1 is connected to one end of the resistor R6 and then connected to the external voltage terminal Vcc, the other end of the resistor R6 is connected to the control pole of the thyristor SCR1, and the first anode of the thyristor SCR1, the power supply P1, the motor M1 and the second anode of the thyristor SCR1 are connected in series to form a loop.

[0043] In this embodiment, the voltage terminal Vcc can be set according to actual needs, such as 5V, 12V, etc., and the selection of the power supply P1 is similar; the voltage signal output terminal of the water pressure sensor outputs a voltage signal to the input voltage terminal V2,

[0044] When the input voltage ui is greater than the reference voltage URH, the diode D1 is turned on and the diode D2 is turned off, so that the thyristor SCR1 is turned on and the motor M1 (water pump) works.

[0045] When the input voltage ui is less than the reference voltage URL, the diode D1 is cut off and the diode D2 is turned on, so that the thyristor SCR1 is turned on and the motor M1 (water pump) works.

[0046] When URL≤ ui ≤URH, both diodes D1 and D2 are cut off, so that thyristor SCR1 is cut off and motor M1 (water pump) stops working.

[0047] In practice, the voltage range (URL-URH) corresponding to the water pressure range is set according to actual needs, that is, the water pressure range is judged through the water pump starting circuit according to the output voltage signal of the water pressure sensor, and the water pump is started or stopped automatically.

[0048] like Figure 1 , Figure 2 and Figure 4 As shown, the embodiment of this specification also discloses a water pump soft starter circuit, including:

[0049] Water pressure sensor;

[0050] A second water pump starting circuit connected to the water pressure sensor;

[0051] Wherein, the second water pump starting circuit includes a reference voltage terminal V1, a reference voltage terminal V3, an input voltage terminal V2, an output voltage terminal V4, a resistor R1, a resistor R2, a diode D1, a diode D2, a voltage regulator Dz, an operational amplifier A1, an operational amplifier A2, a resistor R28, a resistor R29, a resistor R22, a resistor R11, a resistor R3, a resistor R6, a capacitor C12, a field effect transistor Q1, a transistor Q2, a resistor R1, a resistor R4, a resistor R5, a resistor R7, a transistor Q3, an optocoupler U1, a thyristor SCR3, a capacitor C1, a power supply P3 and a motor M3;

[0052] The voltage signal output terminal of the water pressure sensor is connected to the input voltage terminal V2, the reference voltage terminal V1 is connected to the inverting terminal of the operational amplifier A1, the input voltage terminal V2 is connected to the non-inverting terminal of the operational amplifier A1 and the inverting terminal of the operational amplifier A2, the reference voltage terminal V3 is connected to the non-inverting terminal of the operational amplifier A2, the output terminal of the operational amplifier A1 is connected to the positive electrode of the diode D1, the output terminal of the operational amplifier A2 is connected to the positive electrode of the diode D2, the negative electrode of the diode D1 is connected to the negative electrode of the diode D2 and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R2, the negative electrode of the voltage regulator Dz and the output voltage terminal V4, and the other end of the resistor R2 is connected to the positive electrode of the voltage regulator Dz and then grounded;

[0053] One end of the resistor R28 is connected to the output voltage terminal V4, the other end of the resistor R28 is connected to one end of the resistor R29 and the base of the transistor Q2, the other end of the resistor R29 is connected to the emitter of the transistor Q2 and then grounded, the collector of the transistor Q2 is connected to one end of the resistor R22, the other end of the resistor R22 is connected to the G pole of the field effect transistor Q1, one end of the capacitor C12 and one end of the resistor R11, the other end of the resistor R11 is connected to the other end of the capacitor C12 and the S pole of the field effect transistor Q1 and then connected to the external voltage terminal Vcc, the D pole of the field effect transistor Q1 is connected to one end of the resistor R6 and then connected to the external voltage terminal Vcc, and the other end of the resistor R6 is connected to the base of the transistor Q3;

[0054] The emitter of the transistor Q3 is externally connected to the voltage terminal Vcc, the collector of the transistor Q3 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to pin 1 of the optocoupler U1, pin 2 of the optocoupler U1 is grounded, pin 3 of the optocoupler U1 is connected to one end of the resistor R4, pin 4 of the optocoupler U1 is connected to the control electrode of the thyristor SCR3 and one end of the resistor R5, the other end of the resistor R5 is connected to one end of the motor M3, one end of the resistor R7 and one end of the power supply P3, the other end of the motor M3 is connected to the first anode of the thyristor SCR3, the other end of the resistor R4 is connected to the second anode of the thyristor SCR3, one end of the capacitor C1 and the other end of the power supply P3, and the other end of the capacitor C1 is connected to the other end of the resistor R7.

[0055] In this embodiment, the voltage terminal Vcc can be set according to actual needs, such as 5V, 12V, etc., and the power supply P3 can be a DC or AC power supply; the voltage signal output terminal of the water pressure sensor outputs a voltage signal to the input voltage terminal V2.

[0056] When the input voltage ui is greater than the reference voltage URH, the diode D1 is turned on and the diode D2 is turned off, so that the transistor Q3 is turned on, the optocoupler U1 is turned on, the thyristor SCR3 is turned on, and the motor M3 (water pump) works.

[0057] When the input voltage ui is less than the reference voltage URL, the diode D1 is cut off and the diode D2 is turned on, so that the transistor Q3 is turned on, the optocoupler U1 is turned on, the thyristor SCR3 is turned on, and the motor M3 (water pump) works.

[0058] When URL≤ ui ≤URH, both diodes D1 and D2 are cut off, so that transistor Q3 is cut off, optocoupler U1 is cut off, thyristor SCR3 is cut off, and motor M3 (water pump) stops working.

[0059] In practice, the voltage range (URL-URH) corresponding to the water pressure range is set according to actual needs. The water pressure range can be judged through the water pump starting circuit according to the voltage signal output by the water pressure sensor, and the water pump can be started or stopped automatically.

[0060] In some embodiments, the models of the transistor Q2 and the transistor Q3 are S8050, and the model of the field effect transistor Q1 is AO3401.

[0061] In some embodiments, the model of the optocoupler U1 is MOC3061.

[0062] In some embodiments, the thyristor SCR1 and the thyristor SCR3 are bidirectional thyristors.

[0063] The above embodiments describe multiple specific implementations of the present invention, but those skilled in the art should understand that various changes or modifications can be made to these implementations without departing from the principles and essence of the present invention, but these changes and modifications are all within the scope of protection of the present invention.

Claims

1. A water pump soft starter circuit, characterized in that: include: Water pressure sensor; A first water pump starting circuit connected to the water pressure sensor; Wherein, the first water pump starting circuit includes a reference voltage terminal V1, a reference voltage terminal V3, an input voltage terminal V2, an output voltage terminal V4, a resistor R1, a resistor R2, a diode D1, a diode D2, a voltage regulator Dz, an operational amplifier A1, an operational amplifier A2, a resistor R28, a resistor R29, a resistor R22, a resistor R11, a resistor R3, a resistor R6, a capacitor C12, a field effect tube Q1, a triode Q2, a thyristor SCR1, a power supply P1 and a motor M1; The voltage signal output terminal of the water pressure sensor is connected to the input voltage terminal V2, the reference voltage terminal V1 is connected to the inverting terminal of the operational amplifier A1, the input voltage terminal V2 is connected to the non-inverting terminal of the operational amplifier A1 and the inverting terminal of the operational amplifier A2, the reference voltage terminal V3 is connected to the non-inverting terminal of the operational amplifier A2, the output terminal of the operational amplifier A1 is connected to the positive electrode of the diode D1, the output terminal of the operational amplifier A2 is connected to the positive electrode of the diode D2, the negative electrode of the diode D1 is connected to the negative electrode of the diode D2 and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R2, the negative electrode of the voltage regulator Dz and the output voltage terminal V4, and the other end of the resistor R2 is connected to the positive electrode of the voltage regulator Dz and then grounded; One end of the resistor R28 is connected to the output voltage terminal V4, the other end of the resistor R28 is connected to one end of the resistor R29 and the base of the transistor Q2, the other end of the resistor R29 is connected to the emitter of the transistor Q2 and then grounded, the collector of the transistor Q2 is connected to one end of the resistor R22, the other end of the resistor R22 is connected to the G pole of the field effect transistor Q1, one end of the capacitor C12 and one end of the resistor R11, the other end of the resistor R11 is connected to the other end of the capacitor C12 and the S pole of the field effect transistor Q1 and then connected to the external voltage terminal Vcc, the D pole of the field effect transistor Q1 is connected to one end of the resistor R6 and then connected to the external voltage terminal Vcc, the other end of the resistor R6 is connected to the control pole of the thyristor SCR1, and the first anode of the thyristor SCR1, the power supply P1, the motor M1 and the second anode of the thyristor SCR1 are connected in series to form a loop.

2. The water pump soft starter circuit according to claim 1, characterized in that: The model of the field effect tube Q1 is AO3401, and the model of the transistor Q2 is S8050.

3. The water pump soft starter circuit according to claim 1, characterized in that: The thyristor SCR1 is a bidirectional thyristor.

4. A water pump soft starter circuit, characterized in that: include: Water pressure sensor; A second water pump starting circuit connected to the water pressure sensor; Wherein, the second water pump starting circuit includes a reference voltage terminal V1, a reference voltage terminal V3, an input voltage terminal V2, an output voltage terminal V4, a resistor R1, a resistor R2, a diode D1, a diode D2, a voltage regulator Dz, an operational amplifier A1, an operational amplifier A2, a resistor R28, a resistor R29, a resistor R22, a resistor R11, a resistor R3, a resistor R6, a capacitor C12, a field effect transistor Q1, a transistor Q2, a resistor R1, a resistor R4, a resistor R5, a resistor R7, a transistor Q3, an optocoupler U1, a thyristor SCR3, a capacitor C1, a power supply P3 and a motor M3; The voltage signal output terminal of the water pressure sensor is connected to the input voltage terminal V2, the reference voltage terminal V1 is connected to the inverting terminal of the operational amplifier A1, the input voltage terminal V2 is connected to the non-inverting terminal of the operational amplifier A1 and the inverting terminal of the operational amplifier A2, the reference voltage terminal V3 is connected to the non-inverting terminal of the operational amplifier A2, the output terminal of the operational amplifier A1 is connected to the positive electrode of the diode D1, the output terminal of the operational amplifier A2 is connected to the positive electrode of the diode D2, the negative electrode of the diode D1 is connected to the negative electrode of the diode D2 and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the resistor R2, the negative electrode of the voltage regulator Dz and the output voltage terminal V4, and the other end of the resistor R2 is connected to the positive electrode of the voltage regulator Dz and then grounded; One end of the resistor R28 is connected to the output voltage terminal V4, the other end of the resistor R28 is connected to one end of the resistor R29 and the base of the transistor Q2, the other end of the resistor R29 is connected to the emitter of the transistor Q2 and then grounded, the collector of the transistor Q2 is connected to one end of the resistor R22, the other end of the resistor R22 is connected to the G pole of the field effect transistor Q1, one end of the capacitor C12 and one end of the resistor R11, the other end of the resistor R11 is connected to the other end of the capacitor C12 and the S pole of the field effect transistor Q1 and then connected to the external voltage terminal Vcc, the D pole of the field effect transistor Q1 is connected to one end of the resistor R6 and then connected to the external voltage terminal Vcc, and the other end of the resistor R6 is connected to the base of the transistor Q3; The emitter of the transistor Q3 is externally connected to the voltage terminal Vcc, the collector of the transistor Q3 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to pin 1 of the optocoupler U1, pin 2 of the optocoupler U1 is grounded, pin 3 of the optocoupler U1 is connected to one end of the resistor R4, pin 4 of the optocoupler U1 is connected to the control electrode of the thyristor SCR3 and one end of the resistor R5, the other end of the resistor R5 is connected to one end of the motor M3, one end of the resistor R7 and one end of the power supply P3, the other end of the motor M3 is connected to the first anode of the thyristor SCR3, the other end of the resistor R4 is connected to the second anode of the thyristor SCR3, one end of the capacitor C1 and the other end of the power supply P3, and the other end of the capacitor C1 is connected to the other end of the resistor R7.

5. The water pump soft starter circuit according to claim 4, characterized in that: The models of the transistor Q2 and the transistor Q3 are S8050, and the model of the field effect transistor Q1 is AO3401.

6. The water pump soft starter circuit according to claim 4, characterized in that: The model of the optical coupler U1 is MOC3061.

7. The water pump soft starter circuit according to claim 4, characterized in that: The thyristor SCR3 is a bidirectional thyristor.

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