CN214799346U - Motor drive circuit and air conditioner - Google Patents

Abstract

The application provides a motor drive circuit and air conditioner, relate to motor drive technical field, this application uses AC voltage regulation chopper control, only with a simple structure's motor, adjust alternating current motor armature terminal voltage according to control signal's duty cycle, realize the technique of alternating current motor speed governing, make speed control simplistic, the motor need not set up multichannel winding, controller and motor cost greatly reduced, the production efficiency of controller and motor improves greatly, also make the controller miniaturized, the circuit board is miniaturized, motor winding simple structure. A non-contact solid relay is used in the circuit, so that electric arcs cannot be generated when the circuit is switched on or switched off, and the potential safety hazard of igniting flammable refrigerants is eliminated; the use of devices is reduced, the circuit is simple and reliable, the speed regulation is reliable and accurate, and the cost is reduced.

Description

Motor drive circuit and air conditioner

Technical Field

The utility model relates to a motor drive technical field particularly, relates to a motor drive circuit and air conditioner.

Background

The conventional air conditioner internal unit generally adopts a T-shaped speed regulation mode, generally has four wind gears, the rotating speed of the four wind gears of the fan is determined by an internal winding of the motor, the voltage applied when each gear works is commercial power, and armature windings participating in the work are different. Controlling 4-gear wind speed, and occupying a plurality of main chip I/O ports, 4 relays, 5-core needle seats and the like; occupy 4 main chip IO mouths, the I/O mouth that consumes is more, uses 4 relays to control 4 gears, and is equally with high costs and occupy the circuit board space big to and the motor needle file is 5 core needle files and also occupies the circuit board space very much, is unfavorable for the circuit board miniaturization.

For the motor, a plurality of windings are required to be wound at high, middle and low gears, the windings are embedded into the main winding, corresponding gear power lines are connected with the main winding, the cost is very high, the production processes are multiple, defective products are easy to appear, such as poor welding, interturn short circuit caused by shaping and breaking of enameled wires or shaping, and potential safety hazards can be caused when leaked refrigerants are encountered.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a motor drive circuit and air conditioner, for example, it can simplify motor speed's control flow, simplify manufacturing process, reduce manufacturing cost.

The embodiment of the utility model discloses a can realize like this:

in a first aspect, the present invention provides a motor driving circuit, the motor driving circuit includes: the device comprises an input signal end, a first switch tube and a first relay;

the first switch tube comprises a first switch tube first end, a first switch tube second end and a first switch tube control end;

the first relay comprises a relay first input end, a relay second input end, a relay first output end and a relay second output end;

the first input end of the relay is connected with a first direct current power supply, the second input end of the relay is connected with the first end of the first switch tube, the first output end of the relay is used for being connected with a fire wire port of the motor, and the second output end of the relay is connected with a fire wire of the power supply;

the second end of the first switch tube is grounded, and the control end of the first switch tube is connected with a control signal output port of the controller through the input signal end so as to receive a control signal output by the controller;

when the first switch tube control end receives the control signal, the first switch tube first end is conducted with the first switch tube second end, when the first switch tube first end is conducted with the first switch tube second end, current passes through the relay first input end and the relay second input end, the relay first output end is conducted with the relay second output end, and the motor is electrified;

when the duty ratio of the control signal is increased or decreased, the power supply voltage of the motor is increased or decreased, and the rotating speed of the motor is correspondingly increased or decreased.

The scheme that this application provided, the mains voltage size of applying at the motor is adjusted through the duty cycle of adjusting control signal, and then the rotational speed of regulating motor, need not set up a plurality of windings that a plurality of gears correspond, need not set up a plurality of relays, has simplified the connected mode of drive circuit with the motor, has reduced manufacturing cost, simplifies manufacturing process.

In an alternative embodiment, the first relay is a contactless solid state relay. The solid relay is contactless, electric arcs cannot be generated in the switching-on and switching-off processes, the reaction with flammable refrigerants inside the air conditioner can be avoided, and potential safety hazards are eliminated.

In an optional embodiment, the motor driving circuit includes a first inductor, the first inductor includes an inductor first end and an inductor second end, the inductor first end is connected to the relay second output end, and the inductor second end is connected to the power line.

In an optional embodiment, the motor driving circuit includes a resistance-capacitance module, and the resistance-capacitance module includes a first resistor and a first capacitor, and the first resistor and the first capacitor are connected in series between the first output terminal of the relay and the second terminal of the inductor.

In an optional embodiment, the motor driving circuit includes a zero-crossing detection circuit, the zero-crossing detection circuit includes a power input end and a zero-crossing signal output end, the power input end of the zero-crossing detection circuit is connected with the power live wire and the power zero wire, and the zero-crossing signal output end is electrically connected with the controller;

the zero-crossing detection circuit is used for detecting the zero-crossing point of a power supply signal and outputting a zero-crossing signal to the controller under the condition that the zero-crossing point of the power supply signal occurs, and the controller controls the control signal output port to output a control signal according to the zero-crossing signal.

In an optional embodiment, the zero-crossing detection circuit comprises a first diode, an optical coupler, a second switching tube and a fifth resistor; the power supply input end of the zero-crossing detection circuit comprises a zero line input end and a live wire input end;

the input end of the zero line is connected with the anode of the transmitting end of the optical coupler, and the input end of the live wire is connected with the cathode of the transmitting end of the optical coupler;

the anode of the first diode is connected with the input end of the live wire, and the cathode of the first diode is connected with the input end of the zero line;

a collector of a receiving end of the optical coupler is connected with a second direct-current power supply, an emitter of the receiving end of the optical coupler is connected with a first end of a fifth resistor, and a second end of the fifth resistor is grounded;

the second switch tube comprises a first end of the second switch tube, a second end of the second switch tube and a control end of the second switch tube;

the first end of the second switch tube is electrically connected with the second direct-current power supply, the second end of the second switch tube is grounded, and the control end of the second switch tube is connected with the first end of the fifth resistor;

the first end of the second switching tube is also connected with the zero-crossing signal output end and used for outputting a zero-crossing signal, and the zero-crossing signal is a low-level signal.

In an optional embodiment, the zero-crossing detection circuit further comprises: the third capacitor, the fourth capacitor, the sixth resistor, the seventh resistor and the eighth resistor;

the first end of the third capacitor is connected with the emitter of the receiving end of the optocoupler, and the second end of the third capacitor is grounded;

the first end of the fourth capacitor is connected with the zero-crossing signal output end, and the second end of the fourth capacitor is grounded;

the control end of the second switching tube is connected with the first end of the fifth resistor through the sixth resistor; the first end of the second switch tube is electrically connected with the second direct-current power supply through the seventh resistor; and the first end of the second switching tube is connected with the zero-crossing signal output end through the eighth resistor.

In an alternative embodiment, the motor driving circuit includes a first connector, the first connector includes a first terminal and a second terminal, the first terminal is connected with a power supply neutral wire, and the first terminal is used for being connected with a neutral port of a motor;

the second terminal is connected with the first output end of the relay, and the second terminal is used for being connected with a fire wire port of the motor.

In a second aspect, the present invention provides an air conditioner, which comprises a controller, a motor and a motor driving circuit as described in any one of the above embodiments.

In an alternative embodiment, the electric machine comprises an armature winding and a second connector, the second connector comprising a third terminal and a fourth terminal, the armature winding comprising a main winding and a secondary winding, a first end of the main winding being connected to a third terminal of the second connector, i.e. a neutral port;

the second end of the main winding is connected with the first end of the auxiliary winding, and the second end of the main winding is connected with a fourth terminal of the second connector, namely a fire wire port;

the motor driving circuit comprises a first connector matched with the second connector, the first connector comprises a first terminal and a second terminal, the first terminal is connected with a power supply zero line, and the second terminal is connected with a first output end of the relay;

in a case where the first connector is connected to the second connector in a mating manner, the first terminal is connected to the third terminal, and the second terminal is connected to the fourth terminal.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of a conventional motor winding;

FIG. 2 is a schematic diagram of a conventional electrode driving circuit;

FIG. 3 is a schematic diagram of an electrode driving circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of a zero-crossing detection circuit provided in an embodiment of the present application;

FIG. 5 is a schematic diagram of a winding of a motor provided by an embodiment of the present application;

fig. 6 is a schematic diagram of a second connector provided in an embodiment of the present application.

Icon: 100-motor drive circuit; q1-first switch tube; q1 c-first switching tube first end; q1 e-first switching tube second end; q1 b-first switch tube control end; IC 1-first relay; in1 — relay first input; in 2-relay second input; out1 — relay first output; out2 — relay second output; l1 — first inductance; l1 a-inductor first terminal; l1b — inductor second terminal; RC 1-resistance-capacitance module; r1 — first resistance; c1 — first capacitance; CN1 — first connector; cn1a — first terminal; cn1 b-second terminal; 110-zero crossing detection circuit; an IN _ N-zero line input end; IN _ L-fire line input; ZERO-crossing signal output; IC 2-optocoupler; a-a transmitting terminal anode; k-emitting end cathode; c-receiving end collector; e-a receiving end emitter; d1 — first diode; q2-second switch tube; q2 c-second switching tube first end; q2 e-second switch tube second end; q2 b-second switch tube control end; c2 — second capacitance; c3 — third capacitance; c4-fourth capacitance; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; r7 — seventh resistor; r8 — eighth resistance; AC _ L-mains live wire; AC _ N-mains zero line; 130-a motor; CN2 — second connector; cn2 a-third terminal; cn2 b-fourth terminal.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

An alternating current fan in a cabinet commonly used by an air conditioner at present generally uses a T-type speed regulation mode, and is provided with four wind gears (an ultra-strong wind gear, a high wind gear, a medium wind gear and a low wind gear), a connection schematic diagram of a winding in the motor for the T-type speed regulation is shown in fig. 1, the rotating speeds of the four wind gears of the fan in the motor are determined by a winding in the motor, the voltage applied when each gear works is mains supply, and armature windings participating in the work are different, as shown in fig. 1, the ultra-strong gear only participates in a main winding and an auxiliary winding, the high wind gear participates in the main winding, the auxiliary winding and the winding 1, the medium wind gear participates in the main winding, the auxiliary winding, the winding 1 and the winding 2, and the low wind gear participates in the main winding, the auxiliary winding, the winding 1, the winding 2 and the winding 3.

When the motor is produced, the winding 1, the winding 2 and the winding 3 are respectively embedded into the main winding groove, so that the production process is complex; and need external gear power cord (if superstrong shelves connect grey line, high-grade connect black line, well shelves connect yellow line, low-grade connect blue line), the production process is more and loaded down with trivial details, the winding needs to be connected with the power cord, the junction needs to weld well, the winding needs to wrap insulating adhesive tape, with line ligature winding, winding reshaping (if the power cord is many, then be unfavorable for ligature and winding reshaping), the power cord connects the terminal again, the loaded down with trivial details operation of production process is inconvenient.

Fig. 2 shows a schematic diagram of a conventional fan drive circuit. As shown in fig. 2, the logic for turning on the super strong wind shield is: sending a control signal for starting the rotating speed of the fan (namely, outputting high level +5V) to the ULN2003 through an I/O port of the super-strong windshield of the main chip MCU, amplifying the signal through the ULN2003, logically inverting, the winding of the relay (RY04) with super strong wind shield is conducted, current flows through the relay, the relay is attracted, so that the live wire is communicated with the super-strong gear shift line in the motor (namely, the pin 1 of the needle seat is connected with the grey line 1 of the motor terminal, as shown in figure 1), and the live wire is connected with the grey super-strong gear shift line, and the red wire is always connected with the zero line as shown in figure 2, so that the voltage at two ends of the zero line is applied to two ends of the armature winding of the motor (the armature winding participating in the work is a main winding and an auxiliary winding), meanwhile, the fan capacitor is connected with the auxiliary winding in series and then connected with the main winding in parallel to participate in work together, and the motor starts to rotate according to the operation principle of the single-phase capacitor running asynchronous motor.

If the super-strong wind gear is switched to the high wind gear, the super-strong gear can be closed as long as the I/O port of the super-strong wind gear outputs a low level, and then the I/O port of the high wind gear outputs a high level (+5V), so that the motor can operate according to the high wind gear.

According to the above contents, the fan super-strong gear, high gear, middle gear and low gear, the opening or closing of the 4 gears is controlled by the high and low levels output by the 4 wind gear I/O ports of the main chip; therefore, the speed regulation method drives different relays through different gears I/O, and mains supply is added to different armature windings, so that different wind gear rotating speeds are realized, the rotating speeds of all gears are different, and most importantly, the armature windings participating in working in the motor are different. The 4-gear wind speed is controlled in the control mode, 4 main chip I/O ports, 4 paths of ULN2003 ports, 4 relays, 5 core needle seats and the like are occupied, the cost is high, the occupied I/O is more, the motor needle seat adopts the 5 core needle seat, the larger space of a circuit board is occupied, and the miniaturization of the circuit board is not facilitated.

For a motor, high-grade, medium-grade and low- grade windings 1, 2 and 3 are required to be wound and embedded into a main winding, corresponding gear power lines are connected with the main winding, the cost is very high, the production processes are multiple, defective products are prone to occurring, risks such as poor welding, enameled wire shaping and trimming or turn-to-turn short circuit caused by shaping are caused, and certain potential safety hazards exist when a machine type using a plurality of non-explosion-proof relays to control the rotating speed is used for a part of machine types with flammable refrigerants (such as R290).

Based on the problems, the application provides a novel motor driving circuit, which adopts alternating-current voltage-regulating chopping control, only uses a motor with a simple structure, and regulates the armature end voltage of an alternating-current motor by controlling the conduction ratio of a series of pulse voltages so as to realize the speed regulation technology of the alternating-current motor. Referring to fig. 3, fig. 3 is a schematic diagram illustrating a motor driving circuit according to an embodiment of the present disclosure.

As shown in fig. 3, an embodiment of the present application provides a motor drive circuit 100, where the motor drive circuit 100 includes: an input signal terminal, a first switch tube Q1 and a first relay IC 1.

The first switch tube Q1 includes a first switch tube first end Q1c, a first switch tube second end Q1e and a first switch tube control end Q1 b; the first relay IC1 includes a relay first input terminal in1, a relay second input terminal in2, a relay first output terminal out1, and a relay second output terminal out 2; the relay first input terminal in1 is connected to a first dc power supply (e.g., a 5V dc power supply), the relay second input terminal in2 is connected to the first switch tube first terminal Q1c, the relay first output terminal out1 is used for connecting to a fire wire port of the motor 130, the relay second output terminal out2 is connected to a power supply live wire AC _ L, and when the relay first output terminal out1 and the relay second output terminal out2 are connected, the motor 130 is powered on. The second end Q1e of the first switch tube is grounded, and the control end Q1 of the first switch tube is connected to the control signal output port of the controller through the input signal end to receive the control signal output by the controller.

The first switch Q1 switches to the conducting state according to the control signal received by the control terminal of the first switch Q1, when the control terminal of the first switch transistor Q1 receives a predetermined control signal (e.g., a high signal), the first switch transistor Q1c is conducted to the first switch transistor Q1e, and since the first switch transistor Q1e is grounded, both are in a low state, in this case, the relay second input terminal in2 of the first relay IC1 is also in a low state, and a current flows from between the relay first input terminal in1 and the relay second input terminal in2, a current flows from between the relay first input terminal in1 and the relay second input terminal in2, thus, the relay first output end out1 is conducted to the relay second output end out2, the live power line AC _ L of the power source is connected to the live port of the motor 130, and the motor 130 is powered on.

In some possible implementations, when the duty ratio of the control signal is increased or decreased, the power voltage of the motor 130 is correspondingly increased or decreased, so that the rotation speed of the motor 130 is correspondingly increased or decreased, and the rotation speed of the motor 130 and the air outlet speed of the air conditioner can be adjusted by adjusting the duty ratio of the control signal. That is, the pulse signal outputted from the control signal output port of the controller controls the on/off of the first relay IC1, so as to control the connection and disconnection of the live power line AC _ L and the live line port of the motor 130, and thus control whether a zero live line voltage is applied to the armature winding of the motor 130, and thus control the operation and stop of the motor 130.

The scheme that this application provided, can adjust the mains voltage size of applying at motor 130 through the duty cycle of adjusting control signal, and then adjust motor 130's rotational speed, compare traditional wind speed regulation mode, the scheme that this application embodiment provided need not set up a plurality of windings that a plurality of gears correspond, need not set up a plurality of relays, has reduced the port resource of the controller that consumes, has simplified drive circuit and motor 130's connected mode, has reduced manufacturing cost, simplifies manufacturing process.

With the development of new materials, some air conditioners use flammable refrigerants (e.g., R290), and conventional motor driving circuits employ a plurality of relays, and switching of relay contacts on and off states may generate electric arcs, which may cause fire if flammable refrigerants leak. In order to eliminate this potential safety hazard, in an alternative embodiment, the first relay IC1 is a contactless solid-state relay, which is contactless and does not generate an arc during the turn-on and turn-off processes, so as to avoid a reaction with a flammable refrigerant inside the air conditioner, thereby eliminating the potential safety hazard.

In order to prevent the motor 130 from being damaged due to the transient high voltage when the motor 130 is powered on, in some possible implementations, the motor driving circuit 100 includes a first inductor L1, the first inductor L1 includes an inductor first terminal L1a and an inductor second terminal L1b, the inductor first terminal L1a is connected to the relay second output terminal out2, and the inductor second terminal L1b is connected to the power line AC _ L, so as to slow down the voltage rising speed by using the characteristic of the inductor resistance alternating current, and prevent the motor 130 from being damaged due to the transient high voltage or current.

In some possible implementations, the motor driving circuit 100 further includes a resistor-capacitor module RC1, the resistor-capacitor module RC1 includes a first resistor R1 and a first capacitor C1, and the first resistor R1 and the first capacitor C1 are disposed in series between the relay first output end out1 and the inductor second end L1 b. The resistance-capacitance module RC1 can prevent the induced electromotive force generated by the winding (inductive load) inside the motor 130 at the moment of turning on and off the solid state relay, i.e. the transient overvoltage from impacting the triac at the strong power side of the solid state relay, and the resistance-capacitance module RC1 is used to absorb the overvoltage, thereby protecting the solid state relay.

In order to protect various components in the motor driving circuit 100, such as the first switch tube Q1, the first relay IC1, and the like, a resistor is provided at the control end of the first switch tube Q1 to serve as a voltage dividing resistor, and a resistor is provided between the first end Q1c of the first switch tube and the second input end in2 of the relay to serve as a voltage dividing resistor.

In order to realize accurate output of the control signal by the controller, the motor driving circuit 100 provided in the embodiment of the present application further includes a zero-crossing detection circuit 110, where the zero-crossing detection circuit 110 is configured to detect a zero-crossing point of the power signal, so as to facilitate the controller to realize accurate control of outputting the control signal, that is, the controller sends a fan rotation speed control signal to the first switching tube Q1 through the control signal output port each time, and the zero-crossing point of the received zero-crossing signal is used as a reference point of time, so that accuracy of sending the control signal can be ensured, and accurate control is achieved.

Referring to fig. 4, the ZERO-crossing detection circuit 110 includes a power input terminal and a ZERO-crossing signal output terminal ZERO, the power input terminal of the ZERO-crossing detection circuit 110 is connected to the power live line AC _ L and the power ZERO line AC _ N, and the ZERO-crossing signal output terminal ZERO is electrically connected to the controller; the ZERO-crossing detection circuit 110 is configured to detect a ZERO-crossing point of the power signal, and output a ZERO-crossing signal to the controller through the ZERO-crossing signal output terminal ZERO when the ZERO-crossing point of the power signal occurs, and the controller adjusts the control signal output port to output the control signal according to the ZERO-crossing signal.

In an alternative embodiment, the zero-cross detection circuit 110 includes a first diode D1, an optocoupler IC2, a second switching tube Q2, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8.

The power input end of the zero-crossing detection circuit 110 comprises a zero line input end IN _ N and a live line input end IN _ L, the zero line input end IN _ N is connected with the emitting end anode A of the optical coupler IC2, and the live line input end IN _ L is connected with the emitting end cathode K of the optical coupler IC 2. The anode of the first diode D1 is connected to the live input terminal IN _ L, the cathode of the first diode D1 is connected to the neutral input terminal IN _ N, and the fourth resistor R4 is connected IN parallel to the first diode D1.

A receiving end collector C of the optical coupler IC2 is connected with a second direct current power supply (for example, a 5V direct current power supply), a receiving end emitter E of the optical coupler IC2 is connected with a first end of a fifth resistor R5, and a second end of the fifth resistor R5 is grounded; the second switch tube Q2 includes a second switch tube first end Q2c, a second switch tube second end Q2e and a second switch tube control end Q2 b; the first end Q2c of the second switch tube is electrically connected with the second direct current power supply, the second end Q2e of the second switch tube is grounded, and the control end Q2b of the second switch tube is connected with the first end of the fifth resistor R5;

the first end Q2c of the second switch tube is further connected to a ZERO-crossing signal output terminal ZERO for outputting a ZERO-crossing signal, which is a low level signal.

In order to filter out the interference signal, filter capacitors, such as a third capacitor C3, a fourth capacitor C4, and a second capacitor C2, are provided. The first end of the second capacitor C2 is connected with the emitting end anode A of the optocoupler IC2, and the second end of the second capacitor C2 is connected with the emitting end cathode K of the optocoupler IC 2.

A first end of the third capacitor C3 is connected with a receiving end emitter E of the optocoupler IC2, and a second end of the third capacitor C3 is grounded; a first terminal of the fourth capacitor C4 is connected to the ZERO-crossing signal output terminal ZERO, and a second terminal of the fourth capacitor C4 is grounded.

Meanwhile, a plurality of voltage-dividing current-limiting resistors, such as a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8, are also provided.

The second switch tube control end Q2b is connected with the first end of the fifth resistor R5 through a sixth resistor R6; the first end Q2c of the second switch tube is electrically connected with the second direct current power supply through a seventh resistor R7; the second switch tube first end Q2c is connected to the ZERO-crossing signal output ZERO through an eighth resistor R8.

Through setting up above-mentioned filter capacitor and partial pressure current-limiting resistor, reduce signal interference on the one hand, guarantee the stability of zero passage signal, ensure that the zero passage signal that the controller received does not receive external signal interference, utilize resistance to carry out current-limiting, partial pressure to each signal simultaneously, can ensure that the IO port of controller is not damaged.

According to the traditional motor driving circuit, the motor is provided with the plurality of windings, a relay needs to be arranged corresponding to each winding, one path of control signal needs to be arranged, and in addition, the driving circuit needs to be connected with the motor through a five-core socket, so that the motor driving circuit is simplified in the embodiment of the application, and a connector between the motor driving circuit 100 and the motor 130 can also be simplified.

In an alternative embodiment, the motor drive circuit 100 comprises a first connector CN1, the first connector CN1 comprising a first terminal CN1a and a second terminal CN1b, the first terminal CN1a being connected to the mains neutral AC _ N, the first terminal CN1a being adapted to be connected to the neutral port of the motor 130; the second terminal CN1b is connected to the first relay output end out1, and the second terminal CN1b is used for being connected to the fire wire port of the motor 130 (through the second connector CN2 of the motor 130), when the first relay output end out1 and the second relay output end out2 are conducted, the second terminal CN1b is connected to the live power line AC _ L, and the fire wire port of the motor 130 is powered.

Based on the motor driving circuit 100 provided in the foregoing embodiment, an embodiment of the present application further provides an air conditioner, where the air conditioner includes the motor driving circuit 100 provided in the foregoing embodiment for the controller and the motor 130.

It is understood that the scheme provided by the embodiment of the present application simplifies the design of the motor driving circuit 100, and accordingly, the internal winding of the motor 130 can be simplified accordingly. Referring to fig. 5, fig. 5 is a schematic diagram illustrating an internal winding of the motor 130 according to an embodiment of the present application.

As shown in fig. 5, the motor 130 provided in the embodiment of the present application only needs to be provided with the primary winding and the secondary winding, and the rotation speed of the motor 130 is adjusted by changing the voltage applied to the motor 130. The electric machine 130 comprises a second connector CN2, as shown in fig. 6, the second connector CN2 comprises a third terminal CN2a and a fourth terminal CN2b, the first end of the main winding is connected with the third terminal CN2a, i.e. the neutral port, of the second connector CN 2; the second end of the main winding is connected to the first end of the secondary winding, and the second end of the main winding is connected to the fourth terminal CN2b of the second connector CN2, i.e., the fire wire port.

The second connector CN2 is a connector mated with the first connector CN1, and when the first connector CN1 is mated with the second connector CN2, the first terminal CN1a is connected with the third terminal CN2a, that is, the first end of the main winding is connected with the power zero line AC _ N, the second terminal CN1b is connected with the fourth terminal CN2b, that is, the second end of the main winding is connected with the relay first output end out1, when the controller outputs a control signal, the first relay IC1 is turned on, and the second end of the main winding is turned on with the live line power AC _ L to start operation.

Compared with the traditional five-core socket, the first connector CN1 and the second connector CN2 provided by the embodiment of the application have smaller volume and simpler structure.

In some possible implementations, it is only necessary to set wind speed gears with different rotation speed values, such as a super-strong gear, a high gear, a middle gear, and a low gear, and it can be implemented by making the voltage values applied to the two ends of the armature winding of the motor 130 different, where the 4 gears are the same armature winding, and it is implemented by adjusting the duty ratio of the control signal, for example, the controller sends 4 pulse waveform control signals with different duty ratios.

The rotation speed can be changed by changing the on-time T of chopping, i.e., by changing the duty ratio of the control signal, within each fixed chopping on-off period T (the period is 20ms if the frequency is 50HZ, and the period is 1000/60ms to 16.66ms if the frequency is 60 HZ). According to the characteristics of the existing motors 130, that is, each designed motor 130 can measure its corresponding rotation speed by adjusting the voltage value (i.e., the voltage across the armature winding) supplied to it, and then can draw a table of the corresponding values of the voltage across the armature winding and the rotation speed, and then through calculation by the controller, it can be obtained what duty ratio of the control signal is required to be sent when 4 dampers operate at the target rotation speed, for example:

the rotating speed of the motor 130 corresponding to the super-strong gear is 550r/min, and in this case, the voltage across the armature winding is 220V, and the corresponding duty ratio can be set to 100%.

The rotation speed of the motor 130 corresponding to the high-grade is 490r/min, in this case, the voltage across the armature winding is 200V, and the corresponding duty ratio can be set to 90%.

The rotation speed of the motor 130 corresponding to the middle gear is 440r/min, in which case the voltage across the armature winding is 180V, and the corresponding duty cycle can be set to 80%.

The low gear corresponds to a motor 130 speed of 390r/min, in which case the voltage across the armature winding is 160V, and a corresponding duty cycle of 70% can be set.

If the controller receives a super-strong wind gear instruction sent by a user, the super-strong wind gear instruction is processed by the controller, when the controller acquires a zero-crossing signal, the zero-crossing point of each time is taken as a time reference point, a pulse waveform control signal with a duty ratio of 100% is sent through a control signal output port, and the motor 130 operates according to the super-strong gear of 550 r/min.

If the controller receives a high wind gear instruction sent by a user, the high wind gear instruction is processed by the controller, and when the controller acquires a zero-crossing signal, the zero-crossing point of each time is taken as a time reference point, a pulse waveform control signal with a duty ratio of 90% is sent through a control signal output port, and then the motor 130 operates according to the high wind gear 490 r/min.

If the controller receives a medium gear instruction sent by a user and is processed by the controller, when the controller acquires a zero-crossing signal and takes each zero-crossing point as a time reference point, a pulse waveform control signal with a duty ratio of 80% is sent through a control signal output port, and the motor 130 operates according to the medium gear 440 r/min.

If the controller receives a low-wind-gear instruction sent by a user, the low-wind-gear instruction is processed by the controller, and when the controller acquires a zero-crossing signal and takes each zero-crossing point as a time reference point, a pulse waveform control signal with a duty ratio of 70% is sent through a control signal output port, the motor 130 operates according to a low wind gear of 390 r/min.

It should be noted that the duty ratio is not a fixed value, and different motors 130, different corresponding value tables of the power supply voltage and the rotation speed of the motor 130 are different, and the duty ratio is also different; the duty ratio setting value corresponding to each windshield is not fixed, for example, the superstrong gear can also be set to be the duty ratio of 95% instead of 100%, and meanwhile, the wind speed gear can also be set according to the actual situation, the above is exemplified by 4 gears, and other gear numbers can also be adopted, such as 2 gears, 3 gears, 5 gears and the like.

To sum up, the application provides a motor drive circuit and air conditioner uses the chopper control of exchanging voltage regulation, only with a simple structure's motor, adjusts alternating current motor armature terminal voltage according to control signal's duty cycle, realizes the technique of alternating current motor speed governing for rotational speed control is simplified, and the motor need not set up multichannel winding, controller and motor cost greatly reduced, and the production efficiency of controller and motor improves greatly, also makes the controller miniaturized, and the circuit board is miniaturized, and motor winding structure is simplified. A non-contact solid relay is used in the circuit, so that electric arcs cannot be generated when the circuit is switched on or switched off, and the potential safety hazard of igniting flammable refrigerants is eliminated; the use of devices is reduced, the circuit is simple and reliable, the speed regulation is reliable and accurate, and the cost is reduced.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A motor drive circuit (100), characterized in that the motor drive circuit (100) comprises: an input signal terminal, a first switch tube (Q1) and a first relay (IC 1);

the first switch tube (Q1) comprises a first switch tube first end (Q1c), a first switch tube second end (Q1e) and a first switch tube control end (Q1 b);

the first relay (IC1) includes a relay first input (in1), a relay second input (in2), a relay first output (out1), and a relay second output (out 2);

the relay first input end (in1) is connected with a first direct current power supply, the relay second input end (in2) is connected with the first switch tube first end (Q1c), the relay first output end (out1) is used for being connected with a fire wire port of the motor (130), and the relay second output end (out2) is connected with a power supply fire wire (AC _ L);

the second end (Q1e) of the first switch tube is grounded, and the control end (Q1b) of the first switch tube is connected with the control signal output port of the controller through the input signal end so as to receive the control signal output by the controller;

when the first switch tube control end (Q1b) receives the control signal, the first switch tube first end (Q1c) is conducted with the first switch tube second end (Q1e), when the first switch tube first end (Q1c) is conducted with the first switch tube second end (Q1e), a current passes between the relay first input end (in1) and the relay second input end (in2), the relay first output end (out1) is conducted with the relay second output end (out2), and the motor (130) is electrified;

when the duty ratio of the control signal is increased or decreased, the power supply voltage of the motor (130) is increased or decreased, and the rotating speed of the motor (130) is correspondingly increased or decreased.

2. The motor drive circuit (100) of claim 1, wherein the first relay (IC1) is a contactless solid state relay.

3. The motor drive circuit (100) of claim 1, wherein the motor drive circuit (100) comprises a first inductor (L1), wherein the first inductor (L1) comprises an inductor first terminal (L1a) and an inductor second terminal (L1b), wherein the inductor first terminal (L1a) is connected to the relay second output terminal (out2), and wherein the inductor second terminal (L1b) is connected to the hot power supply line (AC _ L).

4. The motor drive circuit (100) of claim 3, wherein the motor drive circuit (100) comprises a resistor-capacitor module (RC1), wherein the resistor-capacitor module (RC1) comprises a first resistor (R1) and a first capacitor (C1), and wherein the first resistor (R1) and the first capacitor (C1) are arranged in series between the relay first output terminal (out1) and the inductor second terminal (L1 b).

5. The motor drive circuit (100) of claim 1, wherein the motor drive circuit (100) comprises a ZERO-crossing detection circuit (110), wherein the ZERO-crossing detection circuit (110) comprises a power input and a ZERO-crossing signal output (ZERO), wherein the power input of the ZERO-crossing detection circuit (110) is connected with a live power line (AC _ L) and a neutral power line (AC _ N), and the ZERO-crossing signal output (ZERO) is electrically connected with the controller;

the zero-crossing detection circuit (110) is used for detecting the zero crossing point of a power supply signal and outputting a zero-crossing signal to the controller under the condition that the zero crossing point of the power supply signal occurs, and the controller controls the control signal output port to output a control signal according to the zero-crossing signal.

6. The motor drive circuit (100) according to claim 5, wherein the zero-crossing detection circuit (110) comprises a first diode (D1), an optical coupler (IC2), a second switching tube (Q2), a fifth resistor (R5); the power supply input end of the zero-crossing detection circuit (110) comprises a zero line input end (IN _ N) and a live line input end (IN _ L);

the input end (IN _ N) of the zero line is connected with the anode (A) of the transmitting end of the optical coupler (IC2), and the input end (IN _ L) of the live line is connected with the cathode (K) of the transmitting end of the optical coupler (IC 2);

the anode of the first diode (D1) is connected with the live input end (IN _ L), and the cathode of the first diode (D1) is connected with the neutral input end (IN _ N);

a receiving end collector (C) of the optical coupler (IC2) is connected with a second direct-current power supply, a receiving end emitter (E) of the optical coupler (IC2) is connected with a first end of a fifth resistor (R5), and a second end of the fifth resistor (R5) is grounded;

the second switch tube (Q2) comprises a second switch tube first end (Q2c), a second switch tube second end (Q2e) and a second switch tube control end (Q2 b);

the first end (Q2c) of the second switch tube is electrically connected with the second direct current power supply, the second end (Q2e) of the second switch tube is grounded, and the control end (Q2b) of the second switch tube is connected with the first end of the fifth resistor (R5);

the first end (Q2c) of the second switch tube is also connected with the ZERO-crossing signal output end (ZERO) and used for outputting a ZERO-crossing signal, and the ZERO-crossing signal is a low level signal.

7. The motor drive circuit (100) of claim 6, wherein the zero crossing detection circuit (110) further comprises: a third capacitor (C3), a fourth capacitor (C4), a sixth resistor (R6), a seventh resistor (R7) and an eighth resistor (R8);

a first end of the third capacitor (C3) is connected with a receiving end emitter (E) of the optical coupler (IC2), and a second end of the third capacitor (C3) is grounded;

a first terminal of the fourth capacitor (C4) is connected with the ZERO-crossing signal output terminal (ZERO), and a second terminal of the fourth capacitor (C4) is grounded;

the second switch tube control terminal (Q2b) is connected with the first terminal of the fifth resistor (R5) through the sixth resistor (R6); the first end (Q2c) of the second switch tube is electrically connected with the second direct current power supply through the seventh resistor (R7); the first end (Q2c) of the second switch tube is connected with the ZERO-crossing signal output end (ZERO) through the eighth resistor (R8).

8. The motor drive circuit (100) of claim 1, wherein the motor drive circuit (100) comprises a first connector (CN1), the first connector (CN1) comprising a first terminal (CN1a) and a second terminal (CN1b), the first terminal (CN1a) being connected with a mains neutral (AC _ N), the first terminal (CN1a) being for connection with a neutral port of a motor (130);

the second terminal (cn1b) is connected to the relay first output (out1), and the second terminal (cn1b) is used for connecting to a fire wire port of the motor (130).

9. An air conditioner, characterized in that the air conditioner comprises a controller, a motor (130) and a motor drive circuit (100) according to any one of claims 1 to 7.

10. The air conditioner according to claim 9, wherein the motor (130) comprises an armature winding and a second connector (CN2), the second connector (CN2) comprises a third terminal (CN2a) and a fourth terminal (CN2b), the armature winding comprises a main winding and a secondary winding, a first end of the main winding is connected with a third terminal (CN2a) of the second connector (CN2), namely a neutral port;

a second end of the main winding is connected with a first end of the secondary winding, and a second end of the main winding is connected with a fourth terminal (CN2b), namely a fire wire port, of the second connector (CN 2);

the motor drive circuit (100) comprises a first connector (CN1) mated with the second connector (CN2), the first connector (CN1) comprises a first terminal (CN1a) and a second terminal (CN1b), the first terminal (CN1a) is connected with a power supply neutral (AC _ N), and the second terminal (CN1b) is connected with the relay first output end (out 1);

when the first connector (CN1) and the second connector (CN2) are connected in a mating manner, the first terminal (CN1a) is connected to the third terminal (CN2a), and the second terminal (CN1b) is connected to the fourth terminal (CN2 b).

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