Circuit structure and air conditioner

Abstract

The utility model provides a circuit structure and an air conditioner. The circuit structure comprises a three-phase circuit. The at least two motor components are connected to the three-phase circuit in parallel; the at least two control modules and the at least two motor parts are arranged in a one-to-one correspondence manner; the at least two control modules and the at least two motor parts are arranged in a one-to-one correspondence manner; each control module controls the corresponding motor part to be connected or disconnected with the three-phase circuit; the at least two current detection modules and the at least two motor components are arranged in a one-to-one correspondence manner; and each current detection module is used for detecting the current value of the corresponding motor component. The circuit structure solves the problem of high driving cost of the brushless direct current motor in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely relates to a circuit structure and air conditioner. BACKGROUND

[0002] Brushless DC motor has the advantages of small size, high efficiency, simple control, wide operating speed range and high reliability. Therefore, in the end products of the air conditioning industry, a large number of brushless DC motors are used as motor solutions. For example: indoor fan, hanging cabinet and household indoor unit. At the same time, the air volume demand range of the product is also larger, and there is a demand for each air volume stage. In order to meet the different load conditions of each air volume, static pressure and shell, the commonly used scheme is to use single fan and double fan in combination. However, the conventional double fan drive needs to use two sets of driving systems and IPM modules. The device is more, the PCB board size is larger, and the cost has no advantage.

[0003] Therefore, using two brushless DC motors in parallel and an IPM driving mode can greatly reduce the cost. And using high-side current detection, accurate current detection of two motors can be realized, and the control accuracy is higher.

[0004] The current detection device of the existing parallel brushless DC motor is arranged at the lower end of the switching tube, and the sum of the currents of the two motors is detected in parallel. It cannot detect the actual current of a single motor. In the prior art, the sum of the currents of the two motors is detected, and then divided by 2 to calculate the current. In this way, there is a deviation between the actual current and the calculated theoretical value. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the above technical defects, and provides a circuit structure and air conditioner to solve the problem of high cost of brushless DC motor drive in related technology.

[0006] In order to achieve the above technical purpose, the utility model adopts the following technical scheme: a circuit structure is provided, which comprises: a three-phase circuit; at least two motor components, the at least two motor components are connected in parallel on the three-phase circuit; at least two control modules, the at least two control modules are set in one-to-one correspondence with the at least two motor components; the at least two control modules are set in one-to-one correspondence with the at least two motor components; each control module controls the corresponding motor component to connect or disconnect with the three-phase circuit; at least two current detection modules, the at least two current detection modules are set in one-to-one correspondence with the at least two motor components; each current detection module is used for detecting the current value of the corresponding motor component.

[0007] Further, the circuit structure further comprises a connecting circuit, one end of the connecting circuit is connected with the three-phase circuit, and the other end of the connecting circuit is connected with the motor component; the current detection module comprises: a current sensor, the current sensor is arranged on the connecting circuit; a current detection circuit connected with the connecting circuit; one end of the current detection circuit is connected with the connecting circuit, and the other end of the current detection circuit is connected with the control module.

[0008] Further, the circuit structure further comprises an overcurrent protection circuit, one end of the overcurrent protection circuit is connected with the current sensor, and the other end of the overcurrent protection circuit is connected with the control module.

[0009] Further, the circuit structure further comprises: an intelligent power module, the intelligent power module is connected with the control module in signal, and the intelligent power module is used for controlling the output of the three-phase circuit.

[0010] Further, the connecting circuit comprises: a first circuit, one end of the first circuit is connected with the U phase of the three-phase circuit, and the other end of the first circuit is connected with the motor component; the first circuit is provided with a first relay K1 used for controlling the on-off of the first circuit; a second circuit, one end of the second circuit is connected with the V phase of the three-phase circuit, and the other end of the second circuit is connected with the motor component; the second circuit is provided with a second relay K2 used for controlling the on-off of the second circuit; a third circuit, one end of the third circuit is connected with the W phase of the three-phase circuit, and the other end of the third circuit is connected with the motor component; the third circuit is provided with a third relay K3 used for controlling the on-off of the third circuit.

[0011] Further, the current detection module comprises: a first current sensor U1 arranged on the first circuit, the first current sensor is located between the first relay K1 and the motor component; and / or a second current sensor U2 arranged on the second circuit, the second current sensor is located between the second relay K2 and the motor component; and / or a third current sensor U3 arranged on the third circuit, the third current sensor is located between the third relay K3 and the motor component.

[0012] Further, the control module comprises a transmission channel, the transmission channel comprises: a first transmission channel, the first transmission channel is connected with the intelligent power module, so as to transmit a first control signal used for controlling the current output of the U phase of the three-phase circuit to the intelligent power module; a second transmission channel, the second transmission channel is connected with the intelligent power module, so as to transmit a second control signal used for controlling the current output of the V phase of the three-phase circuit to the intelligent power module; a third transmission channel, the third transmission channel is connected with the intelligent power module, so as to transmit a third control signal used for controlling the current output of the W phase of the three-phase circuit to the intelligent power module.

[0013] Further, the first transmission channel is multiple, and the multiple first transmission channels are arranged in one-to-one correspondence with the multiple motor components; the second transmission channel is multiple, and the multiple second transmission channels are arranged in one-to-one correspondence with the multiple motor components; and the third transmission channel is multiple, and the multiple third transmission channels are arranged in one-to-one correspondence with the multiple motor components.

[0014] Further, the current detection module is arranged on the winding of the motor component.

[0015] An air conditioner comprises the circuit structure.

[0016] Beneficial effects:

[0017] 1. The circuit structure comprises a three-phase circuit; at least two motor components connected in parallel on the three-phase circuit; at least two control modules arranged in one-to-one correspondence with the at least two motor components; each control module controls the corresponding motor component to be connected or disconnected with the three-phase circuit; and at least two current detection modules arranged in one-to-one correspondence with the at least two motor components, and each current detection module is used for detecting the current value of the corresponding motor component. The current detection module is arranged on the line between the motor component and the three-phase circuit, so that the actual current condition of each motor component can be detected. The circuit structure saves the use of IPM modules and reduces the cost.

[0018] 2. The circuit structure realizes single / dual-fan driving switching use.

[0019] 3. The circuit structure realizes dual-fan driving fault detection and processing. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of one embodiment of the circuit structure adopted by the embodiment of the utility model;

[0021] Figure 2 is a structural schematic diagram of another embodiment of the circuit structure adopted by the embodiment of the utility model;

[0022] Figure 3 is a structural schematic diagram of a connection circuit of the circuit structure adopted by the embodiment of the utility model;

[0023] Figure 4 is a structural schematic diagram of a transmission channel of the circuit structure adopted by the embodiment of the utility model;

[0024] Figure 5 is a work flow chart of the circuit structure provided by the embodiment of the utility model.

[0025] Wherein, the above figures include the following reference signs:

[0026] 1, three-phase circuit; 2, motor component; 3, control module; 31, transmission channel; 4, current detection module; 41, connection circuit; 411, first circuit; 412, second circuit; 413, third circuit; 42, current sensor; 43, current detection circuit; 5, overcurrent protection circuit; 6, intelligent power module. DETAILED DESCRIPTION

[0027] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should be within the scope of protection of the present application.

[0028] Referring to Figures 1 to 5 According to the embodiment of the utility model, a kind of circuit structure is provided, including three-phase circuit 1;At least two motor components 2, at least two motor components 2 are connected in parallel on three-phase circuit 1;At least two control modules 3, at least two control modules 3 are set up one by one with at least two motor components 2;At least two control modules 3 are set up one by one with at least two motor components 2;Each control module 3 controls corresponding motor component 2 and three-phase circuit 1 is connected or disconnected;At least two current detection modules 4, at least two current detection modules 4 are set up one by one with at least two motor components 2;Each current detection module 4 is used to detect the current value of corresponding motor component 2.

[0029] Using the above setting, current detection module 4 is arranged on the line between motor component 2 and three-phase circuit 1, the actual current condition of each motor component 2 can be detected, and each control module 3 is used to control different circuits respectively, so that at least two motor components 2 are connected in parallel on three-phase circuit, and can be used respectively, so that one IPM can drive at least two motor components 2 to work, reduces IPM module use, saves cost.

[0030] Specifically, the variable frequency drive using PWM debugging generally adopts current loop and speed loop to control the motor speed, the current loop needs to collect three-phase current, if two motor currents are detected and calculated in the form of division by 2, it will cause the deviation between the actual current and the calculated theoretical value. Therefore, collecting the actual value of the current of a single motor can more accurately control the rotation of the motor. And in actual use, it is difficult for two motors to run completely consistently, if one of the motors fails, the single motor sampling method can directly detect which motor is faulty, and does not affect the use of the other motor.

[0031] In the circuit structure of the embodiment, referring to Figure 2 , the circuit structure further comprises a connecting circuit 41, one end of the connecting circuit 41 is connected with the three-phase circuit 1, and the other end of the connecting circuit 41 is connected with the motor component 2; the current detection module 4 comprises: a current sensor 42, the current sensor 42 is arranged on the connecting circuit 41; a current detection circuit 43 connected with the connecting circuit 41; one end of the current detection circuit 43 is connected with the connecting circuit 41, and the other end of the current detection circuit 43 is connected with the control module 3. In this way, by arranging the current detection module on the three-phase motor line of the motor component 2, the current of each item can be directly detected.

[0032] Referring to Figure 3 , in the circuit structure of the embodiment, the circuit structure further comprises an overcurrent protection circuit 5, one end of the overcurrent protection circuit 5 is connected with the current sensor 42, and the other end of the overcurrent protection circuit 5 is connected with the control module 3. In this way, by arranging the overcurrent protection circuit 5, when it is detected that the current passing through the motor component 2 is overcurrent, the overcurrent protection circuit 5 sends a signal to the control module 3, and cuts off the power supply, thereby protecting the component.

[0033] In the circuit structure of the embodiment, referring to Figure 3 , the circuit structure further comprises: an intelligent power module 6, the intelligent power module 6 is signal connected with the control module 3, and the intelligent power module 6 is used for controlling the output of the three-phase circuit 1.

[0034] Referring to Figure 3In the circuit structure of the embodiment, the connecting circuit 41 comprises a first circuit 411, one end of the first circuit 411 is connected with the U phase of the three-phase circuit 1, and the other end of the first circuit 411 is connected with the motor component 2; the first circuit 411 is provided with a first relay K1 for controlling the on-off of the first circuit 411; a second circuit 412, one end of the second circuit 412 is connected with the V phase of the three-phase circuit 1, and the other end of the second circuit 412 is connected with the motor component 2; the second circuit 412 is provided with a second relay K2 for controlling the on-off of the second circuit 412; a third circuit 413, one end of the third circuit 413 is connected with the W phase of the three-phase circuit 1, and the other end of the third circuit 413 is connected with the motor component 2; the third circuit 413 is provided with a third relay K3 for controlling the on-off of the third circuit 413. In this way, according to the current detection module 4, it is convenient to control whether the current of each phase is abnormal, thereby facilitating the control of the circuit.

[0035] In the circuit structure of the embodiment, referring to Figure 3 , the current detection module 4 comprises: a first current sensor U1 provided on the first circuit 411, the first current sensor 42 is located between the first relay K1 and the motor component 2; and / or a second current sensor U2 provided on the second circuit 412, the second current sensor 42 is located between the second relay K2 and the motor component 2; and / or a third current sensor U3 provided on the third circuit 413, the third current sensor 42 is located between the third relay K3 and the motor component 2. In this way, U1, V1, and W1 are the three-phase motor lines of the motor M1. The current detection circuit is directly arranged on the three-phase of U1, V1, and W1 to detect the current of each item. The detection of the motor M2 is also the same.

[0036] Referring to Figure 3 , in the circuit structure of the embodiment, the control module 3 comprises a transmission channel 31, the transmission channel 31 comprises: a first transmission channel, the first transmission channel is connected with the intelligent power module 6 to transmit a first control signal for controlling the current output of the U phase of the three-phase circuit 1 to the intelligent power module 6; a second transmission channel, the second transmission channel is connected with the intelligent power module 6 to transmit a second control signal for controlling the current output of the V phase of the three-phase circuit 1 to the intelligent power module 6; a third transmission channel, the third transmission channel is connected with the intelligent power module 6 to transmit a third control signal for controlling the current output of the W phase of the three-phase circuit 1 to the intelligent power module 6. In this way, the control module 3 controls the output current of each phase of the three-phase circuit 1 according to the current condition of each phase circuit, thereby effectively controlling the overall current condition of the motor component 2.

[0037] Referring to Figure 3 , Figure 4In the circuit structure of the embodiment, the first transmission channel is multiple, and the multiple first transmission channels are arranged in one-to-one correspondence with the multiple motor components 2; the second transmission channel is multiple, and the multiple second transmission channels are arranged in one-to-one correspondence with the multiple motor components 2; and the third transmission channel is multiple, and the multiple third transmission channels are arranged in one-to-one correspondence with the multiple motor components 2. In this way, the control module 3 controls the output current of each phase of the three-phase circuit 1 of all the motor components 2 according to the current condition of each phase circuit of each motor component 2, thereby effectively controlling the overall current condition of each motor component 2.

[0038] Participate Figures 1 to 4 In the circuit structure of the embodiment, the current detection module 4 is arranged on the winding of the motor component 2.

[0039] Specifically, the prior art driving circuit is a series connection of two upper and lower switching tubes, which controls two motors at the same time. The total current of the two motors is detected by the lower tube. By using the above arrangement, the current detection circuit 43 can directly detect the current of each phase by being arranged on the three phases of U1, V1 and W1.

[0040] The air conditioner of the embodiment comprises the circuit structure.

[0041] Specifically, the current detection module 4 is arranged on the line between the motor component 2 and the three-phase circuit 1, so that the actual current condition of each motor component 2 can be detected. The frequency conversion driving generally uses a current loop and a speed loop to control the motor speed, and the current loop needs to collect three-phase current. If the current of two motors is detected and calculated in a manner of division by 2, the actual current will deviate from the calculated theoretical value. Therefore, collecting the actual value of the current of a single motor can more accurately control the rotation of the motor. In actual use, it is difficult for two motors to operate completely consistently. If one of the motors fails, the single-motor sampling method can directly detect which motor is faulty, and does not affect the use of the other motor, thereby solving the technical problem of deviation of the actual current value of the parallel brushless direct current motor from the calculated theoretical value.

[0042] The technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments.

[0043] As shown in Figures 1 to 5 The circuit structure of the parallel driving circuit of the brushless direct current motor disclosed in the embodiment comprises five components, i.e., a control module 3 (MCU), an intelligent power module 6 (IPM), a current detection circuit 43, an overcurrent protection circuit 5, a motor M1, M2 (the motor component 2 in the embodiment) and a series connection of a relay and a current sensor 42.

[0044] As shown in Figure 2As shown, the parallel driving circuit of the brushless DC motor disclosed in the embodiment is connected to two motors M1 and M2, and the same relay and current sensor 42 are connected in series to each winding of each motor. The relay functions to control the switching of single and double fan motors. The current sensor is arranged on the winding of each motor, which is different from the conventional arrangement at the lower end of the switch tube. The advantage is that the arrangement at the lower end of the switch tube can detect the sum of the currents of the two motors in parallel connection, and cannot detect the actual current of the single motor. The connection mode in the embodiment can detect the actual three-phase current of each motor part 2, has higher control accuracy, and can more easily detect the abnormal failure of the single motor.

[0045] As shown, Figure 5 The control method of the parallel driving circuit disclosed in the embodiment is shown. The MCU determines whether the load power is greater than P0 according to the actual load demand. If less than P0, K1, K2 and K3 are closed, and K4, K5 and K6 are disconnected. Then the PWM wave is started to be sent, the IPM receives the PWM wave, inverts the bus voltage into three-phase alternating current U, V and W, and supplies M1. The brushless DC motor M1 starts to run, and the running speed of the brushless DC motor M1 can be changed by PWM wave modulation to obtain different air volume to meet different air volume demands. When the required air volume is high, the MCU controls the relays K1, K2, K3, K4, K5 and K6 to be attracted. At the same time, the PWM wave is sent to control the IPM to output three-phase alternating current, and the motors M1 and M2 are synchronously operated to meet the load air volume demand.

[0046] The PWM wave modulation needs to detect the current three-phase current value. Each phase current is sampled by the current sensor 42, and is transmitted to the MCU in real time through the current detection circuit. At the same time, the collected current also passes through the overcurrent protection circuit 5 to feed back the overcurrent signal to the MCU for processing in time. Because the relays and current sensors 42 of M1 and M2 are arranged separately, when one of the motors fails, such as out of step, locked rotor, etc., the MCU can freely disconnect the power supply of the faulty motor through the relay, without affecting the use of the other motor.

[0047] The above embodiments are only for illustrating the technical concept and characteristics of the embodiments, the purpose is to enable those skilled in the art to understand the contents of the embodiments and implement them, and cannot limit the protection scope of the embodiments. Any modification made according to the spirit and essence of the main technical solution of the embodiments should be covered within the protection scope of the embodiments.

[0048] It should be noted that the terms "first", "second" and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. It is to be understood that the use of these terms is arbitrary apart from their definition in the specification or by understanding that the use of these terms in the present description is solely for the purpose of nomenclature and does not in any way limit the scope of the application. Furthermore, the terms "comprise", "to comprise", "comprising", "include", "to include", "including" and the like are used herein to whether directly or indirectly comply with a number of elements, including a number of steps, operations, elements, units and / or the like. Not all the components or steps are mandatory and some can be substituted for other, equivalent components or steps, the inverse being possible.

[0049] Optionally, the specific examples in the embodiments can refer to the examples described in the above embodiments, and the embodiments will not be repeated here.

[0050] The serial numbers of the above embodiments of the present application are only for description, not representing the advantages and disadvantages of the embodiments.

[0051] In the above embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0052] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A circuit structure, characterized by, Comprise: Three-phase circuit (1); At least two motor components (2), at least two motor components (2) are connected in parallel on the three-phase circuit (1); At least two control modules (3), at least two control modules (3) are set up one by one with at least two motor components (2); At least two control modules (3) are set up one by one with at least two motor components (2); Each control module (3) controls the connection or disconnection of the corresponding motor component (2) and the three-phase circuit (1); At least two current detection modules (4), at least two current detection modules (4) are set up one by one with at least two motor components (2); Each current detection module (4) is used for detecting the current value of the corresponding motor component (2).

2. The circuit structure of claim 1, wherein, The circuit structure further comprises a connecting circuit (41), one end of the connecting circuit (41) is connected with the three-phase circuit (1), and the other end of the connecting circuit (41) is connected with the motor component (2); The current detection module (4) comprises: A current sensor (42) is arranged on the connecting circuit (41); The current detection circuit (43) connected with the connecting circuit (41); One end of the current detection circuit (43) is connected with the connecting circuit (41), and the other end of the current detection circuit (43) is connected with the control module (3).

3. The circuit structure of claim 2, wherein, The circuit structure further comprises an overcurrent protection circuit (5), one end of the overcurrent protection circuit (5) is connected with the current sensor (42), and the other end of the overcurrent protection circuit (5) is connected with the control module (3).

4. The circuit structure of claim 2, wherein, The circuit structure further comprises: An intelligent power module (6) is connected with the control module (3) in signal, and the intelligent power module (6) is used for controlling the output of the three-phase circuit (1).

5. The circuit structure of claim 4, wherein, The connecting circuit (41) comprises: A first circuit (411), one end of the first circuit (411) is connected with U phase of the three-phase circuit (1), and the other end of the first circuit (411) is connected with the motor component (2); The first circuit (411) is provided with a first relay K1 for controlling the on-off of the first circuit (411); A second circuit (412), one end of the second circuit (412) is connected with V phase of the three-phase circuit (1), and the other end of the second circuit (412) is connected with the motor component (2); The second circuit (412) is provided with a second relay K2 for controlling the on-off of the second circuit (412); A third circuit (413), one end of the third circuit (413) is connected with W phase of the three-phase circuit (1), and the other end of the third circuit (413) is connected with the motor component (2); The third circuit (413) is provided with a third relay K3 for controlling the on-off of the third circuit (413).

6. The circuit structure of claim 5, wherein, The current detection module (4) comprises: a first current sensor U1 arranged on the first circuit (411), the first current sensor (42) being located between the first relay K1 and the motor component (2); and / or, a second current sensor U2 arranged on the second circuit (412), the second current sensor (42) being located between the second relay K2 and the motor component (2); and / or, a third current sensor U3 arranged on the third circuit (413), the third current sensor (42) being located between the third relay K3 and the motor component (2).

7. The circuit structure of claim 6, wherein, The control module (3) comprises a transmission channel (31), the transmission channel (31) comprising: a first transmission channel connected with the intelligent power module (6) to transmit a first control signal for controlling the current output of the U phase of the three-phase circuit (1) to the intelligent power module (6); a second transmission channel connected with the intelligent power module (6) to transmit a second control signal for controlling the current output of the V phase of the three-phase circuit (1) to the intelligent power module (6); a third transmission channel connected with the intelligent power module (6) to transmit a third control signal for controlling the current output of the W phase of the three-phase circuit (1) to the intelligent power module (6).

8. The circuit structure according to claim 7, characterized in that, the first transmission channel is a plurality of first transmission channels, and the plurality of first transmission channels are arranged in one-to-one correspondence with the plurality of motor components (2); the second transmission channel is a plurality of second transmission channels, and the plurality of second transmission channels are arranged in one-to-one correspondence with the plurality of motor components (2); the third transmission channel is a plurality of third transmission channels, and the plurality of third transmission channels are arranged in one-to-one correspondence with the plurality of motor components (2).

9. The circuit structure according to any one of claims 1 to 8, characterized in that, The current detection module (4) is arranged on the winding of the motor component (2).

10. An air conditioner comprising a circuit configuration, characterized by The circuit structure is any one of the circuit structures in claims 1 to 9.

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