Sensorless AC draining pump motor anti-blocking circuit

Abstract

The utility model discloses a sensorless AC draining pump motor anti-blocking circuit comprising a processing chip U1, first to twentieth resistors R1 to R20, first to third diodes D1 to D3, first to sixth capacitors C1 to C6, a first electrolytic capacitor EC1, a thermal protection module F1, an AC motor coil, a first Zener diode ZD1 and a rectifier diode G; the control mode is simple, single-chip microcomputer power supply adopts a non-isolation resistance-capacitance voltage reduction scheme, and a motor control part adopts a single-chip microcomputer to control a conduction angle of a silicon controlled rectifier to realize motor power control. According to the scheme, the circuit is simple, low in cost, safe and reliable, and the working state of the motor is known in real time through the simplest detection mode so as to be controlled. The scheme is very high in adaptability, can be matched with a motor with a starting coil, is also compatible with a unipolar motor which is lower in cost and is not provided with a starting coil, and is high in control scheme compatibility.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a kind of sensorless ac drainage pump motor anti-blocking circuit. BACKGROUND

[0002] Now the washing machine drainage pump is mostly ac drainage pump, mainly by stator coil, silicon steel sheet, starting coil, permanent-magnetic rotor, fan blade and shell and starting cavity constitute.Stator coil is nested on silicon steel sheet, starting coil is nested on stator coil, motor is started after being electrified by starting coil, and it is closed off starting coil after reaching certain rotating speed, is driven by stator coil, and rotor rotates.

[0003] This motor when motor is blocked because there is no protection switch thus always heat until thermal fuse is disconnected or motor is damaged.When use in washing machine or dishwashing field, it also always rotates under the condition of insufficient water in drain pipe, and generates larger noise. UTILITY MODEL CONTENTS

[0004] The utility model aims at presenting a kind of sensorless ac drainage pump motor anti-blocking circuit, to solve the problem of existing technology in the blocked state because there is no protection switch thus always heat until thermal fuse is disconnected or motor is damaged.When use in washing machine or dishwashing field, it also always rotates under the condition of insufficient water in drain pipe, and generates larger noise.

[0005] The utility model provides a kind of sensorless ac drainage pump motor anti-blocking circuit, including processing chip U1, first to twentieth resistance R1~R20, first to third diode D1~D3, first to sixth capacitor C1~C6, first electrolytic capacitor EC1, thermal protection module F1, ac motor coil, first zener diode ZD1 and rectifier diode G;The one end of the first resistance R1 is connected with external zero voltage, and the other end is connected with the one end of the second resistance R2, and the other end of the second resistance R2 is connected with the input end of the first capacitor C1, and the output end of the first capacitor C1 is connected with external high voltage;The output end of the second capacitor C2 and the one end of the third resistance R3 are all connected with the input end of the first capacitor C1, and the input end of the second capacitor C2 is grounded, and the other end of the third resistance R3 is connected with the RA5 port of the processing chip U1, and the one end of the first capacitor C1 is connected with the RA5 port of the processing chip U1, and the other end is grounded;The one end of the sixth capacitor C6 is connected with external high voltage and the VDD port of the processing chip U1, and the other end is connected with ground and the VSS port of the processing chip U1;The one end of the tenth resistance R10 is connected with external Coil end, and the other end is connected with the one end of the eighth resistance R8, and the other end of the eighth resistance R8 is connected with the RA1 port of the processing chip U1, and the one end of the second capacitor C2 and the fourth resistance R4 are all connected with the RA1 port of the processing chip U1, and the other end is all grounded;The one end of the seventh resistance R7 and the third capacitor C3 is all connected with the RA0 port of the processing chip U1, and the other end is all grounded;The one end of the fifth resistance R5 is connected with external high voltage, and the other end is connected with the RA1 port of the processing chip U1;The one end of the sixth resistance R6 is connected with external high voltage, and the other end is connected with the RA0 port of the processing chip U1;The one end of the eleventh resistance R11 is connected with external zero voltage, and the other end is connected with the one end of the ninth resistance R9, and the other end of the ninth resistance R9 is connected with the RA0 port of the processing chip U1;The one end of the rectifier diode G is connected with external high voltage, and the other end is connected with the one end of the ac motor coil, and the other end of the ac motor coil is connected with external zero voltage, and the thermal protection module F1 is connected between the ac motor coil and external zero voltage;The one end of the twelfth resistance R12 is connected with external high voltage, and the other end is connected with the one end of the fourth capacitor C4, and the other end of the fourth capacitor is connected with the one end of the ac motor coil;The one end of the thirteenth resistance R13 is connected with external high voltage, and the other end is connected with low external level opening circuit;The first zener diode ZD1, the fourteenth resistance R14, the fifth capacitor C5, the first electrolytic capacitor EC1 are connected in parallel, and one end is connected with external high voltage, and the other end is grounded;The one end of the fifteenth resistance R15, the sixteenth resistance R16 and the seventeenth resistance R17 is all grounded, and the other end is all connected with the one end of the eighteenth resistance R18, the nineteenth resistance R19 and the twentieth resistance R20.The other end of the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20 is connected with the input end of the third diode D3, and the output end of the third diode D3 is connected with external zero voltage.

[0006] The sensorless AC drainage pump motor anti-blocking circuit has the following advantages:

[0007] The control mode is simple, the single-chip microcomputer power supply adopts a non-isolated resistance-capacitance voltage reduction scheme, and the motor control part adopts a single-chip microcomputer to control the conduction angle of a thyristor to realize motor power control. The scheme has the advantages of simple circuit, low cost, safety and reliability, and can realize real-time understanding of the working state of the motor through the simplest detection mode to control the motor.

[0008] The scheme has strong adaptability, can match motors with starting coils, is also compatible with single-polarity motors without starting coils and has low cost, and has strong control scheme compatibility. BRIEF DESCRIPTION OF DRAWINGS

[0009] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application. In the drawings:

[0010] Figure 1 The circuit structure schematic diagram of the sensorless AC drainage pump motor anti-blocking circuit in the present application is shown.

[0011] Figure 2 The detection signal diagram of the sensorless AC drainage pump motor anti-blocking circuit in the present application is shown. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments.

[0013] As shown in Figure 1 and Figure 2 , Figure 1 The circuit structure schematic diagram of the sensorless AC drainage pump motor anti-blocking circuit in the present application is shown. Figure 2 The detection signal diagram of the sensorless AC drainage pump motor anti-blocking circuit in the present application is shown. Figure 2In the middle, CH1 is zero-crossing signal, CH2 is mains voltage signal, CH3 is motor back electromotive force CH4 is motor current signal. The utility model provides a kind of sensorless ac drainage pump motor anti-blocking circuit, including processing chip U1, first to twentieth resistance R1~R20, first to third diode D1~D3, first to sixth capacitor C1~C6, first electrolytic capacitor EC1, thermal protection module F1, ac motor coil, first zener diode ZD1 and rectifier diode G;Wherein, single-chip microcomputer 1st foot and 8 feet are connected as power supply end, and power supply comes from half-wave rectification circuit part;2nd foot is mains zero-crossing detection, and single-chip microcomputer controls the conduction angle of silicon controlled rectifier by this signal as one of basis;Single-chip microcomputer 3rd foot time silicon controlled rectifier conduction control foot;Single-chip microcomputer 6th foot detects current conduction time;Single-chip microcomputer 7th foot detects mains voltage.One end of the first resistor R1 is connected to external zero voltage, the other end is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the input end of the first capacitor C1, the output end of the first capacitor C1 is connected to external high voltage; the output end of the second capacitor C2 and one end of the third resistor R3 are both connected to the input end of the first capacitor C1, the input end of the second capacitor C2 is connected to ground, the other end of the third resistor R3 is connected to the RA5 port of the processing chip U1, one end of the first capacitor C1 is connected to the RA5 port of the processing chip U1, and the other end is connected to ground; one end of the sixth capacitor C6 is connected to external high voltage and the VDD port of the processing chip U1, and the other end is connected to ground and the VSS port of the processing chip U1; one end of the tenth resistor R10 is connected to external Coil end, and the other end is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to the RA1 port of the processing chip U1, one end of the second capacitor C2 and the fourth resistor R4 is connected to the RA1 port of the processing chip U1, and the other end is connected to ground; one end of the seventh resistor R7 and the third capacitor C3 is connected to the RA0 port of the processing chip U1, and the other end is connected to ground; one end of the fifth resistor R5 is connected to external high voltage, and the other end is connected to the RA1 port of the processing chip U1; one end of the sixth resistor R6 is connected to external high voltage, and the other end is connected to the RA0 port of the processing chip U1; one end of the eleventh resistor R11 is connected to external zero voltage, and the other end is connected to one end of the ninth resistor R9, the other end of the ninth resistor R9 is connected to the RA0 port of the processing chip U1; one end of the rectifier diode G is connected to external high voltage, and the other end is connected to one end of the AC motor coil, the other end of the AC motor coil is connected to external zero voltage, and the thermal protection module F1 is connected between the AC motor coil and external zero voltage; one end of the twelfth resistor R12 is connected to external high voltage, and the other end is connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor is connected to one end of the AC motor coil; one end of the thirteenth resistor R13 is connected to external high voltage, and the other end is connected to low external level on circuit; the first zener diode ZD1, the fourteenth resistor R14, the fifth capacitor C5, the first electrolytic capacitor EC1 are connected in parallel, one end of which is connected to external high voltage, and the other end is connected to ground; one end of the fifteenth resistor R15, the sixteenth resistor R16 and the seventeenth resistor R17 is connected to ground, and the other end is connected to one end of the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20; the other end of the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20 is connected to the input end of the third diode D3, and the output end of the third diode D3 is connected to external zero voltage.

[0014] When in use, the three conditions of half gas, half water, no water and normal can be realized without any water sensor by a control algorithm, and the control logic is performed according to the working condition, the machine is stopped to reduce the noise generation in the conditions of no water and half gas, half water, and the machine is powered off to protect the motor from being damaged when the drainage pump is blocked by mud or other sundries. The single-chip microcomputer power supply adopts a non-isolated resistor-capacitor step-down scheme, and the motor control part adopts a single-chip microcomputer to control the conduction angle of the thyristor to realize motor power control. This scheme has a simple circuit, low cost and is safe and reliable. When the motor rotates, different voltages and conduction angles of the thyristor will cause different currents flowing through the motor, and the greater the current, the shorter the current conduction time. By controlling the sum of the current conduction time and the current zero-crossing time within 10 ms, the average value of the current can be stabilized, thereby controlling the power of the motor. The current conduction time is different under different voltages, and the scheme calculates the corresponding current conduction time according to the mains, adjusts the opening angle of the thyristor, and maintains the current conduction time within the calculated time. At this time, it is judged whether the conduction angle of the thyristor is within the normal operating range, for example, the conduction angle of the thyristor in normal operation and the conduction angle in the half gas, half water state are completely different. When the drainage pump is blocked, the back electromotive force generated by the motor is basically 0, so when the back electromotive force is detected to be 0, it can be determined that the motor is blocked. After the water pump drains water for a certain period of time, the water flow is reduced to enter the half gas, half water state, and the single-chip microcomputer judges that it is in the half gas, half water state. At this time, the conduction angle of the thyristor is not within the normal operating range, and the motor is turned off within 3 seconds, thereby achieving the purpose of saving electricity.

[0015] The sensorless alternating current drainage pump motor anti-blocking circuit has simple control mode, the single-chip microcomputer power supply adopts a non-isolated resistor-capacitor step-down scheme, and the motor control part adopts a single-chip microcomputer to control the conduction angle of the thyristor to realize motor power control. This scheme has a simple circuit, low cost and is safe and reliable, and the working state of the motor can be understood in real time by the simplest detection mode to control it. The adaptability of the scheme is very strong, and it can not only match the motor with a starting coil, but also be compatible with the single-polarity motor without a starting coil which has lower cost, and the control scheme has strong compatibility.

[0016] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A sensorless anti-clogging circuit for an AC drainage pump motor, characterized in that, The application relates to a processing chip U1, first to twentieth resistors R1 to R20, first to third diodes D1 to D3, first to sixth capacitors C1 to C6, a first electrolytic capacitor EC1, a thermal protection module F1, an alternating current motor coil, a first voltage stabilizing diode ZD1 and a rectifier diode G; one end of the first resistor R1 is connected with external zero voltage, the other end is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with the input end of the first capacitor C1, and the output end of the first capacitor C1 is connected with external high voltage; the output end of the second capacitor C2 and one end of the third resistor R3 are both connected with the input end of the first capacitor C1, the input end of the second capacitor C2 is connected with the ground, and the other end of the third resistor R3 is connected with the RA5 port of the processing chip U1; one end of the first capacitor C1 is connected with the RA5 port of the processing chip U1, and the other end is connected with the ground; one end of the sixth capacitor C6 is connected with external high voltage and the VDD port of the processing chip U1, and the other end is connected with the ground and the VSS port of the processing chip U1; one end of the tenth resistor R10 is connected with external Coil, and the other end is connected with one end of the eighth resistor R8; the other end of the eighth resistor R8 is connected with the RA1 port of the processing chip U1; one end of the second capacitor C2 and one end of the fourth resistor R4 are both connected with the RA1 port of the processing chip U1, and the other ends are both connected with the ground; one end of the seventh resistor R7 and one end of the third capacitor C3 are both connected with the RA0 port of the processing chip U1, and the other ends are both connected with the ground; one end of the fifth resistor R5 is connected with external high voltage, and the other end is connected with the RA1 port of the processing chip U1; one end of the sixth resistor R6 is connected with external high voltage, and the other end is connected with the RA0 port of the processing chip U1; one end of the eleventh resistor R11 is connected with external zero voltage, and the other end is connected with one end of the ninth resistor R9; the other end of the ninth resistor R9 is connected with the RA0 port of the processing chip U1; one end of the rectifier diode G is connected with external high voltage, and the other end is connected with one end of the alternating current motor coil; the other end of the alternating current motor coil is connected with external zero voltage; the thermal protection module F1 is connected between the alternating current motor coil and external zero voltage; one end of the twelfth resistor R12 is connected with external high voltage, and the other end is connected with one end of the fourth capacitor C4; the other end of the fourth capacitor is connected with one end of the alternating current motor coil; one end of the thirteenth resistor R13 is connected with external high voltage, and the other end is connected with a low external level on circuit; the first voltage stabilizing diode ZD1, the fourteenth resistor R14, the fifth capacitor C5 and the first electrolytic capacitor EC1 are connected in parallel, one end of which is connected with external high voltage, and the other end is connected with the ground; one end of the fifteenth resistor R15, the sixteenth resistor R16 and the seventeenth resistor R17 is connected with the ground, and the other ends are connected with one end of the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20.The other end of the eighteenth resistor R18, the nineteenth resistor R19 and the twentieth resistor R20 are connected to the input end of the third diode D3, and the output end of the third diode D3 is connected to the external zero voltage.

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