CN218788860U

CN218788860U - Water pump control circuit board with simple wiring and small size

Info

Publication number: CN218788860U
Application number: CN202222712220.XU
Authority: CN
Inventors: 杨火光; 习静; 李昭强; 覃永能; 赖桑愉
Original assignee: Shenghui Holdings Ltd
Current assignee: Shenghui Holdings Ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-04-04
Anticipated expiration: 2032-10-14

Abstract

The utility model discloses a water pump control circuit board that wiring is succinct, small, detect input circuit, current information display circuit, button control circuit, alarm signal output circuit and 485 communication circuits including MCU master control circuit, power supply circuit, water level state detect input circuit, current information display circuit, button control circuit, alarm signal output circuit and 485 communication circuits are connected with MCU master control circuit respectively, MCU master control circuit still is connected with state display circuit and MCU master control chip U7, power supply circuit is connected with external power source. The utility model provides a succinct, the small water pump control circuit board of wiring has improved the production prescription in workshop, also can greatly avoid because the wiring risk of makeing mistakes that leads to of manual wiring, also played the improvement effect to fan water pump control type block terminal product in the after-sales maintenance service in the future.

Description

Water pump control circuit board with simple wiring and small size

Technical Field

The utility model relates to a water pump control circuit board technical field, especially a water pump control circuit board that the wiring is succinct, small.

Background

In recent years, with the rapid development of social economy, the living standard of people is continuously improved, the demand on electricity is increasingly enhanced, and the dependence on electricity on the life and the production of people can not be avoided; and the existence of electric wisdom block terminal makes people obtain fine control to the use of electricity.

However, the electric wisdom block terminal on the current social market especially needs to use the fan water pump control type block terminal product of more manual wiring installation, and the ubiquitous following several current situations can even be said to be the drawback:

1. the box body of the distribution box is too large in size, so that the distribution box occupies more space during installation, and most of actual field installation spaces are very limited, so that the problem that customers often complain about the large size of the distribution box and cause difficulty in installation exists;

2. the inside wiring of block terminal box is comparatively complicated, need use more manual wiring operation moreover, and manual wiring length of consuming time leads to the ageing once more. In addition, the artificial wiring also has the risk of easy wrong connection, which causes certain potential safety hazard to the production and operation of enterprises.

3. With the lapse of the use time of users, the complicated wiring inside the distribution box body is easy to cause line faults, and once the line faults occur, the dense and hemp interlaced wires inside the distribution box cause that the maintenance is particularly troublesome and complicated, so that the after-sale problems are numerous.

4. Although the annual output and the output quantity of fan water pump control type distribution box products on the market are huge at present, the application prospect is quite attractive; however, the mainstream fan water pump control distribution box products in the market generally have the defects that the box volume is too large, a large amount of manual wiring is needed to be used in the box, the wiring is complex, the risk of wiring errors is easily caused, and the circuit breaks down in the future, so that the maintenance is difficult, the maintenance is complex, the after-sale problem points are numerous and the like.

Therefore, in view of the above disadvantages, a new technical solution needs to be designed to overcome the above disadvantages.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a water pump control circuit board that the wiring is succinct, small to solve above-mentioned background art middle problem.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a succinct, the small water pump control circuit board of wiring, includes MCU master control circuit, power supply circuit, water level state detection input circuit, current information display circuit, button control circuit, alarm signal output circuit and 485 communication circuit are connected with MCU master control circuit respectively, MCU master control circuit still is connected with state display circuit and MCU main control chip U7, power supply circuit is connected with external power source.

As a further improvement of the utility model: the power supply circuit comprises a rectifier bridge BR1, a transformer T1A, a switching power supply management chip U2, a rectifier chip U4, a low-voltage difference linear voltage stabilizer U1 and a low-voltage difference linear voltage stabilizer U3, wherein a first pin of the rectifier bridge BR1 is connected with a live wire, a second pin of the rectifier bridge BR1 is connected with a zero line, the first pin of the rectifier bridge BR1 is also connected with one end of a differential mode capacitor CX1 and a slow break FUSE FUSE1, a second pin of the rectifier bridge BR1 is also connected with one end of a piezoresistor RV1 and the other end of the differential mode capacitor CX1, the slow break FUSE FUSE1 is also connected with the piezoresistor RV1, a third pin of the rectifier bridge BR1 is simultaneously connected with one end of an inductor L5, a resistor R3 and an electrolytic capacitor CE2, the first pin of the transformer T1A is connected with the capacitor C4, the resistor R7, the inductor L5, the resistor R3 and the electrolytic capacitor CE3, the third pin of the transformer T1A is connected with an anode of a diode D1 and the switching power supply management chip U2, the cathode of the diode D1 is connected with a resistor R4, the capacitor C4 and a resistor R7 are connected with the other end of the resistor R4, the fourth pin of the transformer T1A is connected with the anode of the diode D3 and a resistor R13, the resistor R13 is connected with a capacitor C11 and a resistor R16, the first pin of the switching power supply management chip U2 is connected with a resistor R9 and an electrolytic capacitor CE6, the resistor R9 is connected with the cathode of the diode D3, the fourth pin of the switching power supply management chip U2 is connected with a resistor R14 and a resistor R15, the fourth pin of the rectifier bridge BR1, the electrolytic capacitor CE2, the electrolytic capacitor CE3, the electrolytic capacitor CE6, the resistor R14, the resistor R15, the capacitor C11, the resistor R16 and the fourth pin of the transformer T1A are connected with a protective ground, the sixth pin and the seventh pin of the transformer T1A are respectively connected with the rectifier chip U4, and the sixth pin and the seventh pin of the transformer T1A are respectively connected with the low-voltage difference voltage regulator U1, the tenth pin of the transformer T1A is connected with the anode of the diode D4, the third pin of the low dropout regulator U3 is connected with one ends of the diode D4 and the electrolytic capacitor CE5, the first pin of the low dropout regulator U3 is connected with one end of the electrolytic capacitor CE4, the ninth pin of the transformer T1A, the other end of the electrolytic capacitor CE5, the second pin of the low dropout regulator U3 and the other end of the electrolytic capacitor CE4 are grounded.

As a further improvement of the utility model: among the state display circuit, including first display circuit, second display circuit and third display circuit, among the first display circuit, pilot lamp LED2 is connected with resistance R23's one end, resistance R23's the other end is connected with MCU main control chip U7, among the second display circuit, pilot lamp LED3 is connected with resistance R24's one end, resistance R24's the other end is connected with MCU main control chip U7, among the third display circuit, pilot lamp LED4 is connected with resistance R26's one end, resistance R26's the other end is connected with MCU main control chip U7.

As a further improvement of the utility model: the current information display circuit comprises a register U8, a register U9 and a digital tube SMG1, wherein the register U8 and the register U9 are respectively connected with the digital tube SMG1, and the register U8 and the register U9 are respectively connected with an MCU main control chip U7.

As a further improvement of the utility model: the KEY control circuit comprises six KEY KEY, wherein a second pin of any KEY KEY is connected with a resistor R, a first pin of any KEY KEY is connected with an MCU (microprogrammed control unit) main control chip U7, and a third pin and a fourth pin of any KEY KEY are grounded.

As a further improvement of the utility model: in the alarm signal output circuit, the alarm signal output circuit comprises a relay RLY1, a relay RLY2, a relay RLY3 and an interface J2, a second pin of the relay RLY1 is connected with a cathode of a diode D5, a first pin of the relay RLY1 is connected with an anode of the diode D5 and a collector of a transistor Q2, a base of the transistor Q2 is connected with one ends of a capacitor C22, a resistor R31 and a resistor R28, an emitter of the transistor Q2, the other end of the capacitor C22 and the other end of the resistor R31 are grounded, a fourth pin of the relay RLY1 is connected with a first pin of the interface J2, a second pin of the relay RLY2 is connected with a cathode of the diode D6, a first pin of the relay RLY2 is connected with an anode of the diode D6 and a collector of the transistor Q3, a base of the transistor Q3 is connected with one ends of a capacitor C24, a resistor R35 and a resistor R34, an emitter of the capacitor C24 and the other end of the resistor R35 are grounded, a fourth pin of the relay RLY2 is connected with an anode of the diode R3, a fourth pin of the interface y2 is connected with an emitter of the relay RLY3, a base of the relay RLY3 and a collector of the resistor R3, a collector of the resistor RLY3 and a collector of the resistor R4, a base of the resistor RLY3 and a resistor R4 are connected with a cathode of the resistor R4 and a cathode of the resistor R3, a resistor R4 and a resistor R25.

As a further improvement of the utility model: the water level state detection input circuit comprises a photoelectric coupler OP1, a photoelectric coupler OP2, a photoelectric coupler OP3 and a port P2, wherein a first pin of the photoelectric coupler OP1, a first pin of the photoelectric coupler OP2 and a first pin of the photoelectric coupler OP3 are connected, a fourth pin of the photoelectric coupler OP1, a fourth pin of the photoelectric coupler OP2 and a fourth pin of the photoelectric coupler OP3 are connected, a second pin of the photoelectric coupler OP1 is connected with a resistor R30, the resistor R30 is connected with a second pin of the port P2, a second pin of the photoelectric coupler OP2 is connected with a resistor R33, the resistor R33 is connected with a third pin of the port P2, a second pin of the photoelectric coupler OP3 is connected with a resistor R37, the resistor R37 is connected with a fourth pin of the port P2, a third pin of the photoelectric coupler OP1 is connected with a resistor R29, a third pin of the photoelectric coupler OP2 is connected with a resistor R32, a third pin of the photoelectric coupler OP3 is connected with a resistor R29, a resistor R36 and a resistor R36 are grounded.

As a further improvement of the utility model: the 485 communication circuit comprises a transceiver chip U5, a voltage isolation chip U6 and a connection socket CN1, wherein a second pin of the voltage isolation chip U6 is connected to an MCU (microprogrammed control unit) main control chip U7, a third pin of the voltage isolation chip U6 is connected with a resistor R6 and a collector of a triode Q1, a base of the triode Q1 is connected with a resistor R11, the other end of the resistor R11 is connected with the MCU main control chip U7, an emitter of the triode Q1 is grounded, the transceiver chip U5 is connected with the voltage isolation chip U6, an eighth pin of the transceiver chip U5 is connected with a capacitor C7 and a resistor R5, the other end of the capacitor C7 is grounded, a seventh pin of the transceiver chip U5 is connected with a resistor R8 and a resistor R12, a sixth pin of the transceiver chip U5 is connected with the other end of the resistor R5 and a resistor R10, a fifth pin of the transceiver chip U5 and a resistor R12 are grounded, a first pin of the connection socket CN1 is connected with one end of a diode D2 and the other end of the resistor R8, and the other end of the second pin of the connection socket CN1 is connected with a resistor R10 of the diode D2.

Compared with the prior art, the beneficial effects of the utility model are that:

this wiring is succinct, small water pump control circuit board, can compare favourably with the basic function of traditional fan water pump control type block terminal in function, walk the line through PCB on the circuit board and go to replace inevitable loaded down with trivial details manual wiring between each device in traditional fan water pump control type block terminal, the production ageing in workshop has been improved, also can greatly avoid because the wiring risk of making mistakes that leads to of manual wiring, also played the improvement effect to fan water pump control type block terminal product in the after-sales maintenance service in the future.

Drawings

Fig. 1 is a schematic view of the structural framework of the present invention;

FIG. 2 is a schematic diagram of a power circuit according to the present embodiment;

FIG. 3 is a schematic diagram of an MCU master control circuit according to the present invention;

FIG. 4 is a schematic diagram of a current information display circuit according to the present embodiment;

FIG. 5 is a schematic diagram of a key control circuit according to the present embodiment;

FIG. 6 is a schematic diagram of an alarm signal output circuit according to the present embodiment;

FIG. 7 is a schematic diagram of a water level status detection input circuit according to the present embodiment;

fig. 8 is a schematic view of a 485 communication circuit according to the scheme.

Detailed Description

The invention will now be further described with reference to the accompanying drawings, in which:

the utility model discloses a detailed description:

the utility model provides a succinct, the small water pump control circuit board of wiring, includes MCU master control circuit, power supply circuit, water level state detection input circuit, current information display circuit, button control circuit, alarm signal output circuit and 485 communication circuit are connected with MCU master control circuit respectively, MCU master control circuit still is connected with state display circuit and MCU main control chip U7, power supply circuit is connected with external power source.

Preferably, the power circuit comprises a rectifier bridge BR1, a transformer T1A, a switching power management chip U2, a rectifier chip U4, a low-dropout linear regulator U1 and a low-dropout linear regulator U3, wherein a first pin of the rectifier bridge BR1 is connected with a live wire, a second pin of the rectifier bridge BR1 is connected with a zero wire, the first pin of the rectifier bridge BR1 is further connected with one end of a differential mode capacitor CX1 and a slow-breaking FUSE FUSE1, a second pin of the rectifier bridge BR1 is further connected with one end of a piezoresistor RV1 and the other end of the differential mode capacitor CX1, the slow-breaking FUSE FUSE1 is further connected with the piezoresistor RV1, a third pin of the rectifier bridge BR1 is simultaneously connected with one end of an inductor L5, a resistor R3 and an electrolytic capacitor CE2, the first pin of the transformer T1A is connected with the capacitor C4, the resistor R7, the inductor L5, the resistor R3 and the electrolytic capacitor CE3, and a third pin of the transformer T1A is connected with an anode of a diode D1 and the switching power management chip U2, the cathode of the diode D1 is connected with a resistor R4, the capacitor C4 and a resistor R7 are connected with the other end of the resistor R4, the fourth pin of the transformer T1A is connected with the anode of the diode D3 and a resistor R13, the resistor R13 is connected with a capacitor C11 and a resistor R16, the first pin of the switching power supply management chip U2 is connected with a resistor R9 and an electrolytic capacitor CE6, the resistor R9 is connected with the cathode of the diode D3, the fourth pin of the switching power supply management chip U2 is connected with a resistor R14 and a resistor R15, the fourth pin of the rectifier bridge BR1, the electrolytic capacitor CE2, the electrolytic capacitor CE3, the electrolytic capacitor CE6, the resistor R14, the resistor R15, the capacitor C11, the resistor R16 and the fourth pin of the transformer T1A are connected with a protective ground, the sixth pin and the seventh pin of the transformer T1A are respectively connected with the rectifier chip U4, and the sixth pin and the seventh pin of the transformer T1A are respectively connected with the low-voltage difference voltage regulator U1, the tenth pin of the transformer T1A is connected with the anode of the diode D4, the third pin of the low dropout regulator U3 is connected with one ends of the diode D4 and the electrolytic capacitor CE5, the first pin of the low dropout regulator U3 is connected with one end of the electrolytic capacitor CE4, the ninth pin of the transformer T1A, the other end of the electrolytic capacitor CE5, the second pin of the low dropout regulator U3 and the other end of the electrolytic capacitor CE4 are grounded.

The anti-lightning circuit is arranged at input ports of a live wire L and a zero wire N, the anti-lightning circuit is mainly characterized in that a voltage dependent resistor RV1 of a slow break FUSE FUSE1 is connected in series, a differential mode capacitor CX1 is connected behind the anti-lightning circuit and used for filtering differential mode interference, the differential mode capacitor CX1 is connected with a rectifier bridge BR1 and the rectifier bridge BR1 is connected with an electrolytic capacitor CE2, the electrolytic capacitor CE2 is connected with an inductor L5, a resistor R3 and another electrolytic capacitor CE3, the transformer T1A comprises an EE1310 framework and a PC40 magnetic core, wherein a peak absorption circuit of the transformer T1A is formed by connecting a fast recovery diode D1, a resistor R4, a resistor R7 and a capacitor C4, an auxiliary power supply circuit of the transformer T1A is formed by connecting a fast recovery diode D3, a resistor R9 and an electrolytic capacitor CE6, a switching power supply management chip U2 selects a model PN6780M, the voltage feedback circuit is formed by connecting a resistor R13, a resistor R16 and a capacitor C11, a main circuit output of a secondary side of the transformer is connected with a synchronous rectification chip U4, the rectification chip U4 is selected to be of a type PN8306M, the rectification chip U4 is connected with a resistor R2, a capacitor C1, a capacitor C2 and an electrolytic capacitor CE1 to form a synchronous rectification circuit of main circuit output voltage +5V, the output +5V is subjected to synchronous rectification and then connected with a low-voltage-difference linear voltage stabilizer U1, the low-voltage-difference linear voltage stabilizer U1 is selected to be of a type AMS1117-3.3, the capacitor C3 is used for filtering and outputting +3V3 after the low-voltage-difference linear voltage stabilizer U1 is subjected to voltage reduction, an auxiliary circuit output voltage of the secondary side transformer is rectified by a Schottky diode D4, filtered by the electrolytic capacitor CE5, and finally connected with the low-voltage-difference linear voltage stabilizer U3, the low-voltage-difference linear voltage stabilizer U3 is selected to be of a type 78L 05G-3-R for voltage reduction, and finally connected with the electrolytic capacitor CE4 and outputting +5V1.

Preferably, among the state display circuit, including first display circuit, second display circuit and third display circuit, among the first display circuit, pilot lamp LED2 is connected with resistance R23's one end, resistance R23's the other end is connected with MCU main control chip U7, among the second display circuit, pilot lamp LED3 is connected with resistance R24's one end, resistance R24's the other end is connected with MCU main control chip U7, among the third display circuit, pilot lamp LED4 is connected with resistance R26's one end, resistance R26's the other end is connected with MCU main control chip U7.

The MCU master control circuit comprises an MCU master control chip U7, the MCU master control chip U7 is HT5019 in model, and PIN1 and PIN48 of the MCU master control circuit are connected with two input signals of a crystal oscillator YI; PIN6, PIN19 and PIN46 are respectively connected with a capacitor C16, a capacitor C19 and a capacitor C13 for filtering, and the other ends of the capacitor C16, the capacitor C19 and the capacitor C13 are connected with GND; PIN 13-PIN 18 are respectively connected to 1 PIN of KEY 1-KEY 6 of the KEY control circuit; the PIN20, the PIN21, the PIN22 and the PIN24 are respectively connected to a PIN 5, a PIN4 and a PIN3 of the program burning port P1; PIN25 is connected to 11 PINs of a register U8 and a register U9 of the current information display circuit, and PIN26 is connected to 12 PINs of the register U8 and the register U9 of the current information display circuit; the PIN27 and the PIN28 are respectively connected with one PIN of the R11 of the 485 communication circuit and the PIN2 of the voltage isolation chip U6; PIN30, PIN33, PIN34 receive resistance R38, resistance R34, resistance R28 of the output circuit of the alarm signal separately; PIN31, PIN38 and PIN39 are respectively connected to PIN3 of a photoelectric coupler OP3, PIN3 of a photoelectric coupler OP1 and PIN3 of a photoelectric coupler OP2 of the water level state detection input circuit; PIN23 and PIN40 are respectively connected with PIN 14 of a register U8 and PIN 14 of a register U9 of the current information display circuit, and PIN41, PIN42 and PIN43 are respectively connected with a resistor R26, a resistor R24 and a resistor R23; PIN32, PIN47 are both pulled up to +3V3.

Preferably, the current information display circuit comprises a register U8, a register U9 and a digital tube SMG1, the register U8 and the register U9 are respectively connected with the digital tube SMG1, and the register U8 and the register U9 are respectively connected with an MCU main control chip U7.

The register U8 and the register U9 are register chips with the model 74HC595D, the nixie tube SMG1 is an ultra-bright nixie tube with four 0.56-inch red common sun in four positions and the model FJ5461BH, wherein a pin1, a pin2, a pin3, a pin4, a pin 5, a pin6, a pin 7 and a pin 15 of the register U8 are respectively connected to a pin 7, a pin4, a pin2, a pin1, a pin 10, a pin 5, a pin3 and a pin 11 of the nixie tube SMG 1;

pins

8 and 13 of the register U8 and

pins

8 and 13 of the register U9 are connected with GND;

pins

10 and 16 of the capacitor U8 and

pins

10 and 16 of the capacitor U9 are all pulled up to +3V3.

Preferably, the KEY control circuit comprises six KEY KEYs, wherein a second pin of any KEY is connected with a resistor R, a first pin of any KEY is connected with an MCU main control chip U7, and a third pin and a fourth pin of any KEY are grounded.

Selecting TS-1003S-07526 according to the KEY type, wherein the KEY1 and the KEY2 are 2 KEYs for setting the current addition and the current subtraction of the water pump; KEY3 and KEY4 are two KEYs for controlling the starting and stopping of the water pump; KEY5 and KEY6 are control KEYs for setting manual and automatic authority switching of the water pump; moreover, PINs 1 to 1 of the KEY1 to the KEY6 are respectively connected to PIN13 to PIN18 of an MCU main control chip U7 in the MCU main control circuit;

pins

3 and 4 of the KEY 1-KEY 6 are connected with GND; pins 1 of KEY1 to KEY6 are respectively connected to one pins of a resistor R17, a resistor R20, a resistor R21, a resistor R22, a resistor R25 and a resistor R27, and the other pins of the resistor R17, the resistor R20, the resistor R21, the resistor R22, the resistor R25 and the resistor R27 are all pulled up to +3V3.

Preferably, in the alarm signal output circuit, the alarm signal output circuit includes a relay RLY1, a relay RYL2, a relay RYL3 and an interface J2, a second pin of the relay RLY1 is connected to a cathode of a diode D5, a first pin of the relay RLY1 is connected to an anode of the diode D5 and a collector of a transistor Q2, a base of the transistor Q2 is connected to one end of a capacitor C22, a resistor R31 and a resistor R28, an emitter of the transistor Q2, the other end of the capacitor C22 and the other end of the resistor R31 are grounded, a fourth pin of the relay RLY1 is connected to a first pin of the interface J2, a second pin of the relay RLY2 is connected to a cathode of a diode D6, a first pin of the relay RLY2 is connected to an anode of the diode D6 and a collector of a transistor Q3, a base of the transistor Q3 is connected to one end of a capacitor C24, a resistor R35 and a resistor R34, an emitter of the transistor Q3, the other end of a capacitor C24 and the other end of the capacitor C35 are grounded, a fourth pin of the relay RLY is connected to an emitter of the resistor RLY3, a base of the relay RLY3 and a cathode of the resistor RLY3 and a collector of the resistor R3 are connected to a cathode of the resistor RLY3 and a cathode of the resistor R3, a resistor rlr 25.

The models of the relays RLY 1-RLY 3 are JZC-32F/005-HS3; Q2-Q4 are NPN type triodes, and the model is SS8050; the interface J2 is a 3P live wire access terminal of external alarm equipment; three pulse driving signals REY 1-REY 3 sent by the MCU main control chip U7 are amplified through three NPN type triodes Q2-Q4 respectively, and the driving signals are amplified and then are driven to contact points of the relays RLY 1-RLY 3 to be closed, so that external alarm equipment is closed.

Preferably, the water level state detection input circuit includes a photocoupler OP1, a photocoupler OP2, a photocoupler OP3 and a port P2, the first pin of the photocoupler OP1 and the first pin of the photocoupler OP2 are connected with the first pin of the photocoupler OP3, the fourth pin of the photocoupler OP1 and the fourth pin of the photocoupler OP2 are connected with the fourth pin of the photocoupler OP3, the second pin of the photocoupler OP1 is connected with a resistor R30, the resistor R30 is connected with the second pin of the port P2, the second pin of the photocoupler OP2 is connected with a resistor R33, the resistor R33 is connected with the third pin of the port P2, the second pin of the photocoupler OP3 is connected with a resistor R37, the resistor R37 is connected with the fourth pin of the port P2, the third pin of the photocoupler OP1 is connected with a resistor R29, the third pin of the photocoupler OP2 is connected with a resistor R32, the third pin of the photocoupler OP3 is connected with a resistor R29, the resistor R36 is connected with the ground resistor R36 and the resistor R36.

Selecting EL357N (B) (TA) -G as the model of the photoelectric coupler; the port P2 is a 4P wiring terminal for inputting an external water level state signal, and pins 2 of the photoelectric couplers OP1 to OP3 are respectively connected with a resistor R30, a resistor R33 and a resistor R37 and then connected with

pins

2, 3 and 4 of the port P2; the pin1 of the port P2 is connected with GND1; pins 1 of the photoelectric couplers OP1 to OP3 are all connected to +5V1 of the output voltage of the auxiliary circuit of the transformer T1A; pins 4 of the photoelectric couplers OP1 to OP3 are all connected to +3V3 of the output voltage of the main circuit of the transformer T1A; pins 3 of the photoelectric couplers OP1 to OP3 are respectively connected to one ends of a resistor R29, a resistor R32 and a resistor R36; the other ends of the resistor R29, the resistor R32 and the resistor R36 are all connected with GND.

Preferably, the 485 communication circuit includes a transceiver chip U5, a voltage isolation chip U6 and a connection socket CN1, a second pin of the voltage isolation chip U6 is connected to the MCU main control chip U7, a third pin of the voltage isolation chip U6 is connected to the resistor R6 and a collector of the transistor Q1, a base of the transistor Q1 is connected to the resistor R11, the other end of the resistor R11 is connected to the MCU main control chip U7, an emitter of the transistor Q1 is grounded, the transceiver chip U5 is connected to the voltage isolation chip U6, an eighth pin of the transceiver chip U5 is connected to the capacitor C7 and the resistor R5, the other end of the capacitor C7 is grounded, a seventh pin of the transceiver chip U5 is connected to the resistor R8 and the resistor R12, a sixth pin of the transceiver chip U5 is connected to the resistor R10, a fifth pin of the transceiver chip U5 is connected to the resistor R12, a first pin of the connection socket CN1 is connected to one end of the diode D2 and the other end of the resistor R8, and the other end of the connection socket CN1 is connected to the diode R10.

The receiving and transmitting chip U5 is an RS485 receiving and transmitting chip, and the model is SP485EEN-L/TR; the model of the voltage isolation chip U6 is pi 122U31; the connection socket CN1 is a 3P connection terminal, electric signal information of current operation of the water pump is firstly collected through a sampling circuit on the intelligent micro-terminal and then is connected to the water pump control circuit board through the connection socket CN1 connection terminal, the electric signal information is firstly subjected to protocol conversion of an electric signal through the receiving and transmitting chip U5, voltage isolation of the electric signal is realized through the voltage isolation chip U6, and finally the electric signal information is transmitted to the MCU main control chip U7 to be subjected to centralized processing and control.

The working principle is as follows: in terms of stability and safety of power supply of the power supply, a power supply circuit of the water pump control circuit board is a switch power supply with isolated double-path output and output power reaching 10 watts, and the output power of the power supply is enough for each load on the circuit board to use. Moreover, the voltage of the transformer T1A is designed to be output in two paths, and the two paths of output voltages are mutually isolated and do not interfere with each other. The +5V and +3V3 main circuit output voltages of the transformer T1A are supplied to an internal circuit of the water pump control circuit board for power supply, for example, the +5V voltage is supplied to a relay coil in the alarm signal output circuit for power supply; and the +3V3 voltage is provided for the MCU main control circuit, the key control circuit and the current information display circuit. For external circuit parts, such as a 485 communication circuit on a circuit board and an external water level state detection input circuit, which are very easy to touch by a human body in the process of wiring, the other path of output voltage +5V1 of the transformer is required to be used for independently supplying power to the external circuit parts. The power supply voltage is divided into two paths to output the internal circuit and the external circuit on the water pump control circuit board respectively, the internal circuit and the external circuit are isolated and powered, so that not only can a circuit system obtain normal and stable power supply voltage, but also the external circuit part which is possibly touched by mistake in the wiring installation process of the water pump control panel can be isolated by voltage, and the occurrence of personal accidental electric shock accidents can be avoided.

In the realization of the functional principle of the product, the three water level state switching value input signals are used for correlating external control information of the water pump, and the three alarm signals are output to give background switching value alarm signals. The functions of the six keys are respectively: the two control water pumps start and stop; the other two buttons are used for setting rated current of the water pump; the last two are the manual and automatic authority switching control buttons of the water pump control panel. Among the three status indicator lights, the green light represents that the water pump is in a normal operation state; the red light represents that the water pump is in a stop running state; the yellow light represents that the water pump is in a fault condition.

Firstly, the intelligent micro-end is externally connected with a water pump, the intelligent micro-end collects current and other electrical signal information of the water pump in the current running state and transmits the electrical signal information of the water pump to the single chip microcomputer through the 485 communication circuit, and the single chip microcomputer displays the read current information of the water pump in real time through the four-digit nixie tube. Meanwhile, the single chip can judge whether the water pump is in overcurrent operation or not according to the current of the water pump read currently, or judge the external water level height condition at the moment according to three water level state switching value input signals outside the circuit board, so that whether an instruction needs to be sent or not to control the opening and closing of the intelligent micro-terminal through the 485 circuit is determined, and the purposes of controlling the starting and stopping of the water pump connected to the outside are achieved.

Specifically, the single chip microcomputer reads the current of the current water pump and displays the current value on the nixie tube. When the abnormal current is read and the water pump is in an overcurrent operation state, the singlechip sends an instruction to control the intelligent micro-terminal to be switched off through the 485 circuit so as to control the water pump to stop operating, and simultaneously lights the red indicator light to indicate that the water pump stops operating and sends an alarm signal to inform a background (for example, an alarm device, namely a buzzer, connected to the outside of the relay is switched on). When the single chip microcomputer reads that the current of the water pump is normal, the single chip microcomputer can judge the high-low state of the external water level at the moment by combining with an external water level state switching value input signal, and comprehensively judge whether an instruction needs to be sent to control the intelligent micro-terminal switching-on and switching-off by combining with the single chip microcomputer, so that the stop and the operation of the water pump are controlled, and the external water level is maintained at a required normal value.

In conclusion, after the ordinary skilled in the art reads the document of the present invention, according to the present invention, the technical solution and technical concept of the present invention do not need creative mental labor to make other various corresponding transformation schemes, which all belong to the protection scope of the present invention.

Claims

1. The utility model provides a succinct, the small water pump control circuit board of wiring, includes MCU master control circuit, power supply circuit, water level state detection input circuit, current information display circuit, button control circuit, alarm signal output circuit and 485 communication circuit are connected with MCU master control circuit respectively, MCU master control circuit still is connected with state display circuit and MCU main control chip U7, power supply circuit is connected with external power source.

2. The water pump control circuit board with simple wiring and small volume according to claim 1, wherein the power circuit comprises a rectifier bridge BR1, a transformer T1A, a switching power management chip U2, a rectifier chip U4, a low dropout regulator U1 and a low dropout regulator U3, a first pin of the rectifier bridge BR1 is connected with a live wire, a second pin of the rectifier bridge BR1 is connected with a neutral wire, the first pin of the rectifier bridge BR1 is further connected with a differential mode capacitor CX1 and one end of a slow break FUSE FUSE1, the second pin of the rectifier bridge BR1 is further connected with one end of a piezoresistor RV1 and the other end of the differential mode capacitor CX1, the slow break FUSE FUSE1 is further connected with the piezoresistor RV1, a third pin of the rectifier bridge BR1 is simultaneously connected with one end of an inductor L5, a resistor R3 and an electrolytic capacitor CE2, the first pin of the transformer T1A is connected with a capacitor C4, a resistor R7, an inductor L5, a resistor R3 and an electrolytic capacitor CE3, the third pin of the transformer T1A is connected with the anode of a diode D1 and a switching power supply management chip U2, the cathode of the diode D1 is connected with the resistor R4, the capacitor C4 and the resistor R7 are connected with the other end of the resistor R4, the fourth pin of the transformer T1A is connected with the anode of the diode D3 and a resistor R13, the resistor R13 is connected with a capacitor C11 and a resistor R16, the first pin of the switching power supply management chip U2 is connected with a resistor R9 and an electrolytic capacitor CE6, the resistor R9 is connected with the cathode of the diode D3, the fourth pin of the switching power supply management chip U2 is connected with a resistor R14 and a resistor R15, the fourth pin of the rectifier bridge BR1, the electrolytic capacitor CE2, the electrolytic capacitor CE3, the electrolytic capacitor CE6, the resistor R14, the resistor R15, the capacitor C11, the resistor R16 and the fourth pin of the transformer T1A are connected with a protection ground, the sixth pin and the seventh pin of the transformer T1A are respectively connected with a rectifier chip U4, the sixth pin and the seventh pin of the transformer T1A are further respectively connected with a low-dropout linear regulator U1, the tenth pin of the transformer T1A is connected with the anode of a diode D4, the third pin of the low-dropout linear regulator U3 is connected with one end of the diode D4 and one end of an electrolytic capacitor CE5, the first pin of the low-dropout linear regulator U3 is connected with one end of the electrolytic capacitor CE4, the ninth pin of the transformer T1A, the other end of the electrolytic capacitor CE5, the second pin of the low-dropout linear regulator U3 and the other end of the electrolytic capacitor CE4 are grounded.

3. The water pump control circuit board with the simple wiring and the small size according to claim 1, wherein the state display circuit comprises a first display circuit, a second display circuit and a third display circuit, an indicator light LED2 is connected with one end of a resistor R23 in the first display circuit, the other end of the resistor R23 is connected with an MCU main control chip U7, an indicator light LED3 is connected with one end of a resistor R24 in the second display circuit, the other end of the resistor R24 is connected with the MCU main control chip U7, an indicator light LED4 is connected with one end of a resistor R26 in the third display circuit, and the other end of the resistor R26 is connected with the MCU main control chip U7.

4. The water pump control circuit board with the simple wiring and the small size as claimed in claim 1, wherein the current information display circuit comprises a register U8, a register U9 and a digital tube SMG1, the register U8 and the register U9 are respectively connected with the digital tube SMG1, and the register U8 and the register U9 are respectively connected with an MCU main control chip U7.

5. The water pump control circuit board with simple wiring and small volume as claimed in claim 1, wherein the KEY control circuit comprises six KEY KEYs, wherein a second pin of any KEY is connected with a resistor R, a first pin of any KEY is connected with an MCU main control chip U7, and a third pin and a fourth pin of any KEY are grounded.

6. A compact, low profile water pump control circuit board as claimed in claim 1, wherein said alarm signal output circuit includes a relay RLY1, a relay RYL2, a relay RYL3 and an interface J2, a second pin of said relay RLY1 is connected to a cathode of a diode D5, a first pin of said relay RLY1 is connected to an anode of a diode D5 and a collector of a transistor Q2, a base of said transistor Q2 is connected to one end of a capacitor C22, a resistor R31 and a resistor R28, an emitter of said transistor Q2, the other end of a capacitor C22 and the other end of a resistor R31 are grounded, a fourth pin of said relay RLY1 is connected to a first pin of an interface J2, a second pin of said relay RLY2 is connected to a cathode of a diode D6, a first pin of said relay RLY2 is connected to an anode of a diode D6 and a collector of a transistor Q3, a base of said transistor Q3 is connected to one end of a capacitor C24, a resistor R35 and a resistor R34, the other end of said emitter of said relay RLY3 and the other end of said relay RLY3 are connected to a base of a resistor RLY2, a resistor RLY3 and a base of said relay rlj 3 are connected to a cathode of a resistor rlj 2, a resistor R3, a base of said second pin of said relay RLY2 and a resistor rlj 3 are connected to a resistor rlj 2 and a resistor rlj 3, a resistor R3, a base of said interface pin of said resistor RLY2 and a resistor rlj 2 is connected to a resistor rlj 3, a resistor R4.

7. The water pump control circuit board of claim 1, wherein the water level detection input circuit comprises a photo coupler OP1, a photo coupler OP2, a photo coupler OP3 and a port P2, wherein a first pin of the photo coupler OP1, a first pin of the photo coupler OP2 and a first pin of the photo coupler OP3 are connected, a fourth pin of the photo coupler OP1, a fourth pin of the photo coupler OP2 and a fourth pin of the photo coupler OP3 are connected, a second pin of the photo coupler OP1 is connected with a resistor R30, a resistor R30 is connected with a second pin of the port P2, a second pin of the photo coupler OP2 is connected with a resistor R33, a resistor R33 is connected with a third pin of the port P2, a second pin of the photo coupler OP3 is connected with a resistor R37, a resistor R37 is connected with a fourth pin of the port P2, a third pin of the photo coupler OP1 is connected with a resistor R29, a third pin of the photo coupler OP2 is connected with a resistor R32, a resistor R36 is connected with a ground resistor R32, and a resistor R32 is connected with a ground.

8. The water pump control circuit board with the concise wiring and the small volume as claimed in claim 1, wherein the 485 communication circuit includes a transceiver chip U5, a voltage isolation chip U6 and a wiring socket CN1, a second pin of the voltage isolation chip U6 is connected to an MCU main control chip U7, a third pin of the voltage isolation chip U6 is connected to a resistor R6 and a collector of a transistor Q1, a base of the transistor Q1 is connected to a resistor R11, the other end of the resistor R11 is connected to the MCU main control chip U7, an emitter of the transistor Q1 is grounded, the transceiver chip U5 is connected to the voltage isolation chip U6, an eighth pin of the transceiver chip U5 is connected to a capacitor C7 and a resistor R5, the other end of the capacitor C7 is grounded, a seventh pin of the transceiver chip U5 is connected to a resistor R8 and a resistor R12, a sixth pin of the transceiver chip U5 is connected to the other end of the resistor R5 and a resistor R10, a fifth pin of the transceiver chip U5 is grounded, a first pin of the wiring socket CN1 is connected to a resistor D2 and a resistor R8 of the other end of the wiring socket CN1 are connected to a diode socket CN 2, and the other end of the diode socket CN1 is connected to a resistor R10.