JP5527181B2 - Driving circuit - Google Patents

Description

  The present invention relates to a drive circuit applied to an indoor unit or the like of an air conditioner, and relates to a technique for driving an actuator such as a flap that changes the blowing direction of conditioned air, for example.

  2. Description of the Related Art Conventionally, in an electric device that drives an actuator, for example, an air conditioner, a ceiling-embedded type that blows conditioned air in four directions from four outlets in order to widen the air flow distribution of conditioned air blown into an air-conditioned room Equipment has been proposed. In such an indoor unit of an air conditioner, a flap that performs a swing operation to change the wind direction of the conditioned air is provided at each outlet formed in a decorative panel that covers the indoor unit. Each flap is provided with a drive motor on the decorative panel side for enabling individual swing operations. In order to drive and control the operation of the flap composed of the operation mechanism, for example, as shown in Patent Document 1 below, the indoor unit includes a decorative panel from each driver provided on a control board in the main body of the indoor unit. A control signal transmission signal line (harness) is wired for each of the drive motors up to the drive motor on the side.

JP 2000-199639 A

  In the indoor unit of the conventional air conditioner described above, a signal line is wired for each drive motor from each driver on the control board in the indoor unit body to the drive motor on the decorative panel side. The number of wires from the drive motor to the decorative panel is increasing. For this reason, when the number of ports connected to these wirings increases, the size of the connector on the control board increases. Further, since the harness connecting the control board and the drive motor becomes larger in diameter due to the increase in the number of wirings, it is a factor that deteriorates the installation property when installing the operation mechanism of the flap in the indoor unit.

  The present invention has been made in order to solve the above-described problem. The diameter of the wiring connected to the driver of the actuator driving source from the control unit that controls the operation of the actuator is reduced, and the control connected to the wiring is performed. An object is to enable prevention of an increase in size of a connector on a substrate.

According to the first aspect of the present invention, m two-phase stepping motors provided for each of the m (m is an integer of 2 or more) actuators provided in an indoor unit of an air conditioner and driving the actuators are provided. A driving circuit for driving,
Two driver elements for supplying current to the two-phase stepping motor;
A control unit for controlling the driving of the two-phase stepping motor;
Two change-over switches provided between the two-phase stepping motor and the driver element and having at least four change-over contacts numbered as one common contact and a serial number;
A power line connected to each of the two-phase stepping motors for supplying power to the two-phase stepping motor;
On each wiring connected to the power line for each two-phase stepping motor, m open / close switches provided for each two-phase stepping motor,
In one of the two change-over switches, each of the change-over contacts is connected to each phase of the two-phase stepping motor in a one-to-one relationship, and the other of the two change-over switches is the one of the one change-over switches. Each of the switching contacts having the same number as each of the switching contacts of the selector switch is in each of the phases excited next to the phase of each of the two-phase stepping motors to which the switching contacts of the one switching switch are connected. Connected one-to-one,
The controller is
A drive signal output unit for outputting a drive signal for driving each of the two-phase stepping motors to each of the driver elements;
Assuming that the common contacts of the two changeover switches are connected to the changeover contacts having the same number by the two changeover switches, a switch changeover signal for sequentially switching the connection to each changeover contact is output to the changeover switch. A switching signal output unit;
And an open / close signal output unit that outputs an open / close signal to each open / close switch to control the open / close of each open / close switch.

  In the present invention, in accordance with the switching signal output from the switching signal output unit, the two switching switches connect their common contacts to the switching contacts having the same number by the two switching switches, and the connection to each switching contact is established. Since each of the above-described two-phase stepping motors is driven via the driver element by the drive signal output from the drive signal output unit in the order of switching, the control unit has even wiring that can output the switch switching signal and the drive signal. Thus, each of the two-phase stepping motors can be driven without having to provide wiring for each of the two-phase stepping motors. Thereby, for example, even when the control unit is disposed at a position away from each of the two-phase stepping motors and the driver elements, the signal transmission harness connected to the driver elements from the control unit is reduced in diameter. It becomes possible to do. In addition, since no port corresponding to the wiring for each of the two-phase stepping motors is required on the control unit side, the control unit side and the driver element side are connected to connect the wirings by reducing the number of ports. The required connector can also be reduced in size.

  In addition, each switching contact of one of the two switching switches is connected to each phase of each two-phase stepping motor on a one-to-one basis, and the other of the two switching switches is the one switching switch. Each of the switching contacts having the same number as each of the switching contacts has a one-to-one correspondence with the phase excited next to the phase of each of the two-phase stepping motors to which the switching contacts of the one switching switch are connected. Even if the two-phase stepping motor is driven by two-phase excitation or 1-2-phase excitation by switching the two change-over switches by the change signal and the drive signal, two driver elements are connected. Can be driven simultaneously.

  The open / close signal output unit controls the open / close of each open / close switch according to the open / close signal so that only the drive source to be driven among the drive sources is connected to the power supply line, and The number can be varied.

  The invention according to claim 2 is the drive circuit according to claim 1, wherein the driver element uses, as the actuator, a flap that changes a wind direction of conditioned air blown from the indoor unit into the air-conditioned room. The flap motor to be driven is operated as the two-phase stepping motor.

  According to the present invention, for example, even when the switching signal output unit and the driving signal output unit are disposed at positions away from the respective flap motors and driver elements, the switching signal output unit and the driving signal output unit. Thus, it is possible to reduce the diameter of the signal transmission harness connected to the driver element. In addition, since there is no need for a port corresponding to the wiring for each of the flap motors on the switching signal output unit and the drive signal output unit side, the switching signal output unit and The connectors required on the drive signal output unit side and the driver element side can also be reduced in size.

Further, the invention according to claim 3 is the drive circuit according to claim 2, wherein the driver element removes dust attached to a filter that captures dust contained in air in an air-conditioned room sucked by a fan. Connected to p number of two-phase stepping motors for dust removing mechanism that drive p (p is an integer of 2 or more) number of dust removing members,
The dust removing mechanism two-phase stepping motor is electrically connected to the control unit via a driver board on which the driver element is provided.

  According to the present invention, the two-phase stepping motor for the dust removal mechanism is electrically connected to the control unit via the driver board on which the driver element is provided. Among the wirings connecting to the two-phase stepping motor side, at least the control side and the harness part to the driver board for driving the flap motor have signal transmission harnesses corresponding to the number of the dust removal mechanism motor. The diameter can be reduced without being required, and the connector provided on the control unit side for connecting the harness can also be reduced in size.

  According to a fourth aspect of the present invention, in the drive circuit according to the first aspect, the driver element removes the dust attached to a filter that captures dust contained in air in the air-conditioned room sucked by the fan. A dust removing mechanism motor that drives a dust removing member as the actuator is operated as the two-phase stepping motor.

  According to the present invention, for example, even when the switching signal output unit and the driving signal output unit are disposed at positions away from the dust removing mechanism motor and the driver element, the switching signal output unit and the driving signal output are provided. It is possible to reduce the diameter of the signal transmission harness connected to the driver element from the section. Further, since the port corresponding to the wiring for each dust removing mechanism motor is unnecessary on the switching signal output unit and the drive signal output unit side, the switching signal output unit is connected to connect the wirings by reducing the number of the ports. Also, the connectors required on the drive signal output unit side and the driver element side can be reduced in size.

  According to the present invention, it is possible to reduce the diameter of the wiring connected to the driver of the actuator driving source from the control unit that controls the operation of the actuator and to prevent the connector on the control board connected to the wiring from becoming large. Can be.

It is a longitudinal section showing the composition of the indoor unit concerning the embodiment of the present invention. It is the II-II sectional view taken on the line of FIG. It is a perspective view which shows the structure of an indoor unit, (A) shows a casing, (B) shows a cover member, (C) shows a decorative panel. It is a perspective view which shows the structure of the partition plate of an indoor unit, an air filter, and a dust storage container. It is the schematic which shows the drive control system of the flap in an indoor unit. It is the schematic which shows the structure of the driver circuit which drives and controls the motor for flaps. It is a figure which shows the drive signal and switching signal in the case of driving the motor for flaps by two-phase excitation. It is a figure which shows the drive signal and switching signal in the case of driving the motor for flaps by 1-2 phase excitation. It is the schematic which shows the driver circuit for the drive control of the motor for flaps. It is the schematic which shows the drive control system of the flap in an indoor unit, and a dust removal unit. It is the schematic which shows the structure of the flap in an indoor unit, and a dust removal unit drive circuit.

  Hereinafter, an indoor unit of an air conditioning apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a configuration of an indoor unit according to an embodiment of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a perspective view showing the configuration of the indoor unit, in which (A) shows a casing, (B) shows a cover member, and (C) shows a decorative panel. FIG. 4 is a perspective view illustrating configurations of the partition plate, the air filter, and the dust container of the indoor unit.

  The air conditioner includes a refrigerant circuit (not shown) in which a compressor, an outdoor heat exchanger and an expansion valve provided in an outdoor unit, and a heat exchanger 22 provided in the indoor unit 1 are connected by piping. . The refrigerant circuit performs a vapor compression refrigeration cycle by reversibly circulating the refrigerant. In the air conditioner, a cooling operation in which the heat exchanger 22 functions as an evaporator in the refrigerant circuit and a heating operation in which the heat exchanger 22 functions as a condenser in the refrigerant circuit are performed.

  The indoor unit 1 of the air conditioner constitutes a part of the air conditioner and is installed on the ceiling of the indoor space. The indoor unit 1 is a so-called four-way-blowing type ceiling-embedded air conditioner, and the indoor fan 21 and the heat exchanger 22 that constitute the indoor unit 1 include a casing 10 that forms the main body of the indoor unit 1 and the casing 10. The decorative panel 11 is attached so as to cover the entire bottom portion of the casing 10.

  As shown in FIGS. 1 and 2, the indoor unit 1 includes a casing 10 and a decorative panel 11. In the casing 10, an indoor fan 21, a heat exchanger 22, and a drain pan 23 are provided. The cover member 10b is provided with an air filter 30, a filter driving filter motor M5, a dust removing device 50, a dust container 60, a dust transport mechanism 80, and a dust container box 90.

  As shown in FIG. 3A, the casing 10 is formed in a substantially rectangular parallelepiped box shape whose lower side is opened. The cover member 10b is attached to the lower side of the casing 10. As shown in FIG. 3B, a decorative panel 11 is further attached to the lower portion of the cover member 10b. The cover member 10b is also formed in a substantially rectangular parallelepiped box shape whose lower side is open.

  As shown in FIG. 1, a heat insulating material 17 is laminated on the inner surface of the casing 10. A bell mouth 24 is formed on the lower end surface of the casing 10 and communicates with a vent hole 26 of a cover member 10b described later. Inside the casing 10, an indoor fan 21, a heat exchanger 22 and a drain pan 23 are arranged. The casing 10 is installed in a state where the lower part is inserted through the opening of the ceiling plate.

  The decorative panel 11 is formed in a rectangular plate shape. The plan view shape of the decorative panel 11 is slightly larger than the plan view shape of the casing 10. The decorative panel 11 is attached so as to cover the lower side of the cover member 10b with the seal member 16 interposed therebetween. When the decorative panel 11 is attached to the casing 10, the decorative panel 11 is exposed to the room.

  As shown in FIGS. 1 and 3, the decorative panel 11 is formed with one suction port 13, four air outlets 14, and a cleaner insertion port 18. The suction port 13 is formed in a rectangular shape and is formed in the center of the decorative panel 11. A suction grill 12 formed in a slit shape is fitted into the suction port 13. Each outlet 14 is formed in an elongated rectangular shape. Each blower outlet 14 is formed along each side of the decorative panel 11. Each air outlet 14 is provided with a flap (wind direction adjusting plate) 15. That is, the flap 15 is provided on the decorative panel 11 outside the casing 10. The flap 15 is rotated to adjust the wind direction (the blowing direction). The vacuum cleaner insertion port 18 is formed in a rectangular shape and is formed on the side of the suction grill 12 (see FIG. 3C).

  The indoor fan 21 is a so-called turbo fan. The indoor fan 21 is disposed near the center of the casing 10 and is located above the suction port 13. The indoor fan 21 includes a fan motor 21a and an impeller 21b. The fan motor 21 a is fixed to the top plate of the casing 10. The impeller 21b is connected to the rotation shaft of the fan motor 21a. A bell mouth 24 communicating with the suction port 13 is provided below the indoor fan 21. The bell mouth 24 divides a space upstream of the heat exchanger 22 into an indoor fan 21 side and a suction grill 12 side in the casing 10. The indoor fan 21 is configured to blow out air sucked from below through the bell mouth 24 in the circumferential direction.

  The heat exchanger 22 is configured by a cross fin type fin-and-tube heat exchanger. The heat exchanger 22 is formed in a quadrangular shape in plan view, and is disposed so as to surround the indoor fan 21. In the heat exchanger 22, heat exchange is performed between the refrigerant flowing in the interior and the indoor air (blowing air) sent by the indoor fan 21.

  The drain pan 23 is provided below the heat exchanger 22. The drain pan 23 is for receiving drain water generated by condensation of moisture in the air in the heat exchanger 22. The drain pan 23 is provided with a drain pump for draining drain water (not shown). The drain pan 23 is arranged with a gradient so that drain water is collected at the location where the drain pump is installed.

  The upper end surface of the cover member 10b constitutes a partition plate 25. The partition plate 25 partitions the space between the bell mouth 24 and the suction grill 12 up and down. That is, the partition plate 25 partitions the upstream space of the heat exchanger 22 into a heat exchanger 22 side including the bell mouth 24 and a suction grill 12 side. As shown in FIG. 1, an air filter 30 is provided inside the cover member 10 b, and further includes a filter driving mechanism 40, a dust removing device 50, a dust storage container 60, a dust transport mechanism 80, and a dust container box 90. A dust removing mechanism 500 is arranged.

  In the center of the partition plate 25, a vent hole 26 is formed for the air sucked from the suction port 13 to flow into the bell mouth 24. As shown in FIG. 4, the vent hole 26 is partitioned into a fan shape by four radial members 27 with circular holes extending in the radial direction. The radial members 27 are connected to each other at the center of the circle, and a cylindrical filter rotation shaft 28 protrudes downward at that portion. The filter rotation shaft 28 is a rotation shaft for the air filter 30 to rotate. One radial member 27 is provided with two filter holders 29.

  As shown in FIG. 4, the air filter 30 is disposed below the partition plate 25 and is formed in a disk shape having a size that covers the entrance of the bell mouth 24. Specifically, the air filter 30 includes an annular filter body 31 and a mesh member 37. A gear portion 32 is provided on the outer peripheral surface of the filter body 31. A cylindrical shaft insertion portion 33 supported by six radial ribs 34 is provided at the annular center portion of the filter body 31. That is, each radial rib 34 extends radially from the shaft insertion portion 33. Further, an inner circumferential rib 35 and an outer circumferential rib 36 formed in an annular shape concentric with the filter main body 31 are provided in the inner circle portion of the filter main body 31. The outer circumferential rib 36 is formed with a larger diameter than the inner circumferential rib 35. The mesh member 37 is stretched over the entire inner circle portion of the filter body 31. The air sucked from the suction port 13 passes through the mesh member 37 of the air filter 30 and flows into the bell mouth 24. At that time, dust in the air is captured by the mesh member 37.

  The air filter 30 is urged downward by the above-described filter retainer 29 coming into contact with the circumferential ribs 35 and 36. Thereby, the air filter 30 is pressed against the rotating brush 51 of the dust removing device 50 described later. The rotary brush 51 is rotationally driven using a brush motor M6 as a drive source. Therefore, the removal efficiency by the dust removal mechanism 500 is improved. The dust removing mechanism 500 further includes a damper that is an air volume adjusting mechanism and a damper motor M7 (described later) that is a driving source thereof.

  As shown in FIG. 4, the air filter 30 is attached by inserting the shaft insertion portion 33 into the filter rotation shaft 28 of the partition plate 25. The air filter 30 is rotatable about the filter rotation shaft 28. A dust container 60 is disposed below the air filter 30. Then, in a state where the air filter 30 is fitted into the shaft insertion portion 33, the filter mounting portion 68 of the dust container 60 is fixed to the shaft insertion portion 33 of the partition plate 25 with a set screw 28 a. As a result, the air filter 30 is held between the partition plate 25 and the dust container 60.

  A filter driving mechanism 40 for rotating the air filter 30 is provided in the vicinity of the air filter 30 (see FIG. 2). That is, the filter drive mechanism 40 constitutes a moving unit that relatively moves the air filter 30 and the rotating brush 51.

  Specifically, the filter drive mechanism 40 includes a filter drive motor and a limit switch (not shown).

  A drive gear (not shown) is provided on the drive shaft of the filter drive motor, and this drive gear meshes with the gear portion 32 of the filter main body 31. A switch operating portion that is a projecting piece is provided on one end face of the drive gear. The switch actuating portion acts on a lever provided in the limit switch by the rotation of the drive gear. When the switch operating part acts on the lever, the limit switch detects the rotational position of the drive gear.

  As shown in FIG. 3, in the decorative panel 11, swing shafts 3061 are provided at both ends in the length direction of each flap 15 and at the center in the width direction. The swing shaft 3061 is pivotally supported on the inner wall portion 141 of the air outlet 14. Furthermore, a flap motor is provided in the decorative panel 11 portion in the vicinity of each flap 15. The motors provided corresponding to the respective flaps 15 are referred to as flap motors M1 to M4. Each swing shaft 3061 is rotated by the driving force supplied from the flap motors M <b> 1 to M <b> 4, and each flap 15 attached to the swing shaft 3061 rotates as the swing shaft 3061 rotates.

  Next, the drive control system of the flap 15 in the indoor unit 1 will be described. FIG. 5 is a schematic diagram showing a drive control system of the flap 15 in the indoor unit 1.

  The casing 10 of the indoor unit 1 includes an indoor control board 100 on which a control system circuit that controls driving of the indoor unit 1 is mounted. The indoor control board 100 is provided with a microcomputer 101 and a connector 102.

  The microcomputer 101 includes a CPU and the like, and controls overall operation of the indoor unit 1. The connector 102 has a harness L1 connected to the driver circuit 111 side in order to connect to a driver circuit 111 for driving flap motors M1 to M4 described later provided on the decorative panel 11 side. Connected. The microcomputer 101 outputs a switch switching signal for connecting the common contact C0 to the switching contact of the same number in each changeover switch S1, S2 to each changeover switch S1, S2 in each changeover switch S1, S2 to be described later. And functions as a drive signal output unit that outputs a drive signal for driving the flap motors M1 to M4 to a driver element D described later.

  Further, the microcomputer 101 functions as an open / close signal output unit that outputs an open / close signal for switching open / close states of open / close switches SW11 to SW14 described later to the open / close switches SW11 to SW14. That is, the microcomputer 101 functionally includes a switching signal output unit, a drive signal output unit, and an open / close signal output unit. However, the switching signal output unit, the drive signal output unit, and the open / close signal output unit may be configured by circuits, and the microcomputer 101 may include the circuits. Further, it may be understood that the microcomputer 101 itself outputs the switching signal, the drive signal, and the open / close signal.

  On the other hand, the decorative panel 11 is provided with a driver board 110 on which a driver circuit 111 and the like for driving and controlling flap motors M1 to M4 that are driving sources of the flap 15 are mounted. The driver board 110 is further provided with a connector 112. The connector 112 is connected to a harness L <b> 1 connected to the indoor control board 100 of the casing 10. The connector 112 is connected to the driver circuit 111 on the driver board 110.

  The harness L1 has control signal lines for outputting drive signals for driving the flap motors M1 to M4 sent from the microcomputer 101 of the indoor control board 100 to the driver board 110 of the decorative panel 11. In this way, the harness L1 is connected between the connector 102 on the indoor control board 100 side and the connector 112 on the driver board 110 side, and the two connectors are connected, whereby the harness L1 is sent from the microcomputer 101 of the indoor control board 100. Driving signals for driving the flap motors M1 to M4 are input to the driver circuit 111.

  Further, the decorative panel 11 is provided with the flap motors M1 to M4 as described above. In the present embodiment, flap motors M <b> 1 to M <b> 4 are provided as drive sources for the four flaps 15. In the present embodiment, two-phase stepping motors are used as the flap motors M1 to M4.

  A drive circuit according to an embodiment of the present invention includes a microcomputer (a drive signal output unit, a switching signal output unit, an open / close signal output unit, a control unit) 101, a driver circuit 11 (a driver element D and changeover switches S1, S2), and It is equipped with.

  Next, the configuration of the driver circuit 111 for driving control of the flap motors M1 to M4 will be described. FIG. 6 is a schematic diagram showing the driver circuit 111 for controlling the driving of the flap motors M1 to M4, focusing on the connection portion with the flap motor M1. FIG. 7 shows a drive signal and a switching signal when the flap motor M1 is driven by two-phase excitation, and FIG. 8 shows a drive signal and a switching signal when the flap motor M1 is driven by 1-2 phase excitation. FIG.

  First, drive control for the flap motor M1 will be described with reference to FIGS.

  The driver circuit 111 includes a driver element D and a changeover switch S. The driver element D includes two driver elements D1 and D2 for driving a flap motor M1, which is a two-phase stepping motor.

  Each of the driver elements D1 and D2 is connected to the connector 112 by a drive signal line. The drive signal lines connected corresponding to the driver elements D1 and D2 are referred to as drive signal lines l1 and l2, respectively. A drive signal for driving the flap motor M1 sent from the microcomputer 101 of the indoor control board 100 by the control signal line of the harness L1 and the drive signal lines l1 and l2 of the driver circuit 111 via the connector 112. Input to each of the driver elements D1, D2.

  The changeover switch S is provided for each of the two driver elements D1 and D2. The changeover switch S includes changeover switches S1 and S2 provided corresponding to the driver elements D1 and D2.

  Each changeover switch S1, S2 has one common contact C0 and changeover contacts C1-C4, respectively. The common contact C0 of each change-over switch S1, S2 is connected to a predetermined driver element (in the present embodiment, the number part of the attached reference numeral has the same number) among the driver elements D1, D2. ing.

  The switching contacts C1 to C4 of the changeover switch S1 are connected to the positive side or the negative side (that is, any one of the first phase to the fourth phase) of each phase of the flap motor M1. Further, the switching contacts C1 to C4 of the changeover switch S2 are connected to the switching contacts C1 to C4 of the changeover switch S1 to the switching contacts having the same numbers as the switching contacts C1 to C4 of the changeover switch S1, respectively. It is connected to the phase excited next to the phase of the flap motor M1.

  For example, as shown in FIG. 6, when the changeover contact C1 of the changeover switch S1 is connected to the first phase of the flap motor M1, the changeover contact C1 of the changeover switch S2 is connected to the second phase of the flap motor M1. Is done. Similarly, the switching contact C2 of the changeover switch S1 is connected to the second phase of the flap motor M1, and the switching contact C2 of the changeover switch S2 is connected to the third phase of the flap motor M1. The switching contact C3 of the changeover switch S1 is connected to the third phase of the flap motor M1, and the switching contact C3 of the changeover switch S2 is connected to the fourth phase of the flap motor M1. The switching contact C4 of the changeover switch S1 is connected to the fourth phase of the flap motor M1, and the switching contact C4 of the changeover switch S2 is connected to the first phase of the flap motor M1.

  Each change-over switch S1, S2 switches to which of the switching contacts C1 to C4 the common contact C0 is connected in accordance with the switch switching signal.

  Next, drive control of the flap motor M1 will be described. First, drive control by two-phase excitation will be described.

  During drive control of the flap motor M1 by two-phase excitation, the microcomputer 101 of the indoor control board 100 sends a drive signal for exciting each phase of the flap motor M1, which is one drive source of the flap 15. . This drive signal is sent from the microcomputer 101 of the indoor control board 100 to the driver board 110 on the decorative panel 11 side through a control signal line included in the harness L1.

  The switch switching signal sent from the microcomputer 101 of the indoor control board 100 is input to the driver board 110 through the switching signal line of the harness L1 that connects the connector 102 of the indoor control board 100 to the connector 112 on the decorative panel 11 side. From the connector 112, the signals are sent to the change-over switches S1 and S2 through control signal lines. This switch switching signal is a signal that indicates which of the switching contacts C1 to C4 is connected to the common contact C0 in each of the switching switches S1 and S2. Thus, since the changeover switches S1 and S2 are four ports having the changeover contacts C1 to C4, the switch changeover signal is a 2-bit signal.

  That is, the harness L1 includes the control signal line and the switching signal line, and outputs the driving signal and the switch switching signal from the microcomputer 101 to the driver circuit 111.

  For example, the microcomputer 101 transmits a drive signal and a switching signal having the contents shown in the table of FIG. 7, and drives the flap motor M1 by two-phase excitation. In the table of FIG. 7, the driving signal and the switching signal input to the driver circuit 111 at the time of the driving control are shown as a 2-bit signal.

  First, the microcomputer 101 sends a switch switching signal (switch switching signal “00” in FIG. 7) for connecting both the common contacts C0 of the changeover switches S1 and S2 to the switching contact C1, and sets the common contact C0 of both switches. Connected to the switching contact C1, and in this state, the drive signal for exciting the phase of the flap motor M1 connected to the switching contact C1 with respect to the driver elements D1 and D2 (D1 drive signal “1” in FIG. 7). , D2 drive signal “1”). At this time, as described above, the switching contact C1 of the changeover switch S1 is connected to the first phase of the flap motor M1, and the switching contact C1 of the changeover switch S2 is connected to the second phase of the flap motor M1. The first phase and the second phase of the flap motor M1 are excited.

  Subsequently, the microcomputer 101 sends a switch switching signal (switch switching signal “01” in FIG. 7) for connecting both the common contacts C0 of the changeover switches S1 and S2 to the switching contact C2, and sends them to the driver elements D1 and D2. Then, a drive signal (D1 drive signal “1” and D2 drive signal “1” in FIG. 7) for exciting the phase of the flap motor M1 connected to the switching contact C1 is sent. At this time, the switching contact C2 of the changeover switch S1 is connected to the second phase of the flap motor M1, and the changeover contact C2 of the changeover switch S2 is connected to the third phase of the flap motor M1, and therefore the flap motor M1. The second and third phases are excited.

  After that, the microcomputer 101 sends a switch switching signal (switch switching signal “10” in FIG. 7) for connecting both the common contacts C0 of the selector switches S1 and S2 to the switching contact C3, and is sent to the driver elements D1 and D2. When a drive signal for exciting the phase of the flap motor M1 connected to the switching contact C1 (D1 drive signal “1” and D2 drive signal “1” in FIG. 7) is sent, respectively, The third phase and the fourth phase of the flap motor M1 are excited.

  Subsequently, the microcomputer 101 sends a switch switching signal (switch switching signal “11” in FIG. 7) for connecting both the common contacts C0 of the changeover switches S1 and S2 to the switching contact C4, and sends them to the driver elements D1 and D2. On the other hand, when drive signals (D1 drive signal “1” and D2 drive signal “1” in FIG. 7) for exciting the phase of the flap motor M1 connected to the switching contact C1 are sent, respectively, Thus, the fourth phase and the first phase of the flap motor M1 are excited. Thereafter, the same excitation control by sending a switch change signal and a drive signal, and connection switching between the common contact C0 and the change contacts C1 to C4 of the changeover switches S1 and S2 are repeated.

  In this description, when the driving of the flap motor M1 is started, the common contact C0 of both the changeover switches S1 and S2 is connected to the switching contact C1, and excitation is started from the first phase and the second phase of the flap motor M1. Of course, excitation may be started from any phase.

  The connection switching control between the common contact C0 and the switching contacts C1 to C4 of the changeover switches S1 and S2 by sending the switch change signal and the drive signal, and the excitation control, the two driver elements D1 and D2 perform the first change from the first phase. The flap motor M1, which is a two-phase stepping motor having up to four phases, can be rotationally driven by two-phase excitation.

  Next, drive control of the flap motor M1 by 1-2 phase excitation will be described. The circuit configuration is the same as in the case of the two-phase excitation described above.

  For example, the microcomputer 101 transmits a drive signal and a switching signal having the contents shown in the table of FIG. 8, and drives the flap motor M1 by 1-2 phase excitation. In the table of FIG. 8, the driving signal and the switching signal input to the driver circuit 111 at the time of the driving control are shown as a 2-bit signal.

  When the flap motor M1 is driven and controlled by 1-2 phase excitation, the microcomputer 101 first switches, for example, a switch switching signal for connecting both the common contacts C0 of the changeover switches S1 and S2 to the changeover contact C1 (switches in FIG. 8). The switching signal “00”) is sent to connect the common contact C0 of both switches to the switching contact C1, and in this state, the driver element D1 receives the first of the flap motor M1 connected to the switching contact C1. A drive signal that excites the phase (D1 drive signal “1” in FIG. 8), and a drive signal that does not excite the second phase of the flap motor M1 connected to the switching contact C1 is supplied to the driver element D2 (in FIG. 8). D2 drive signal “0”) is transmitted. As a result, only the first phase of the flap motor M1 is excited.

  Subsequently, the microcomputer 101 sends a switch switching signal (switch switching signal “00” in FIG. 8) for connecting both the common contacts C0 of the changeover switches S1 and S2 to the switching contact C1, and the driver element D1 has a switching signal. A drive signal for exciting the first phase of the flap motor M1 connected to the contact C1 (D1 drive signal “1” in FIG. 8) is provided, and the flap motor connected to the switching contact C1 is connected to the driver element D2. A drive signal for exciting the second phase of M1 (D2 drive signal “1” in FIG. 8) is sent out. As a result, the first phase and the second phase of the flap motor M1 are excited.

  Subsequently, the microcomputer 101 sends a switch switching signal (switch switching signal “01” in FIG. 8) that connects both the common contacts C0 of the changeover switches S1 and S2 to the switching contact C2, and the driver element D1 receives the switching signal. A drive signal (D1 drive signal “1” in FIG. 8) that excites the second phase of the flap motor M1 connected to the contact C2 is used, and the flap motor connected to the switching contact C2 is connected to the driver element D2. A drive signal (D2 drive signal “0” in FIG. 8) that does not excite the third phase of M1 is transmitted. As a result, only the second phase of the flap motor M1 is excited.

  Subsequently, the microcomputer 101 sends a switch switching signal (switch switching signal “01” in FIG. 8) that connects both the common contacts C0 of the changeover switches S1 and S2 to the switching contact C2, and the driver element D1 receives the switching signal. A drive signal (D1 drive signal “1” in FIG. 8) that excites the second phase of the flap motor M1 connected to the contact C2 is used, and the flap motor connected to the switching contact C2 is connected to the driver element D2. A drive signal for exciting the third phase of M1 (D2 drive signal “1” in FIG. 8) is sent out. As a result, the second phase and the third phase of the flap motor M1 are excited.

  Further, the microcomputer 101 sends a switch switching signal (switch switching signal “10” in FIG. 8) for connecting both the common contacts C0 of the changeover switches S1 and S2 to the switching contact C3, and the switching contact is sent to the driver element D1. A drive signal for exciting the third phase of the flap motor M1 connected to C3 (D1 drive signal “1” in FIG. 8) is supplied to the driver element D2, and the flap motor M1 connected to the switching contact C3 is connected to the driver element D2. A drive signal that does not excite the fourth phase (D2 drive signal “0” in FIG. 8) is sent. As a result, only the third phase of the flap motor M1 is excited.

  Subsequently, the microcomputer 101 sends a switch switching signal (switch switching signal “10” in FIG. 8) for connecting both the common contacts C0 of the selector switches S1 and S2 to the switching contact C3. A drive signal for exciting the third phase of the flap motor M1 connected to the contact C3 (D1 drive signal “1” in FIG. 8) is provided, and the flap motor connected to the switching contact C3 is connected to the driver element D2. A drive signal for exciting the fourth phase of M1 (D2 drive signal “1” in FIG. 8) is sent out. As a result, the third phase and the fourth phase of the flap motor M1 are excited.

  Further, the microcomputer 101 sends a switch switching signal (switch switching signal “11” in FIG. 8) for connecting both the common contacts C0 of the changeover switches S1 and S2 to the switching contact C4, and the switching contact is sent to the driver element D1. A drive signal for exciting the fourth phase of the flap motor M1 connected to C4 (D1 drive signal “1” in FIG. 8) is supplied to the driver element D2, and a flap motor M1 connected to the switching contact C4 is provided. A drive signal that does not excite the first phase (D2 drive signal “0” in FIG. 8) is transmitted. As a result, only the fourth phase of the flap motor M1 is excited.

  Subsequently, the microcomputer 101 sends a switch switching signal (switch switching signal “11” in FIG. 8) for connecting both the common contacts C0 of the selector switches S1 and S2 to the switching contact C4, and the driver element D1 receives the switching signal. A drive signal for exciting the fourth phase of the flap motor M1 connected to the contact C4 (D1 drive signal “1” in FIG. 8) is supplied to the driver element D2, and a flap motor connected to the switching contact C4. A drive signal for exciting the first phase of M1 (D2 drive signal “1” in FIG. 8) is sent out. As a result, the fourth phase and the first phase of the flap motor M1 are excited.

  Thereafter, the same excitation control by sending a switch change signal and a drive signal, and connection switching between the common contact C0 and the change contacts C1 to C4 of the changeover switches S1 and S2 are repeated. In the 1-2 phase excitation, naturally, excitation may be started from any phase.

  The connection switching control between the common contact C0 and the switching contacts C1 to C4 of the changeover switches S1 and S2 by sending the switch change signal and the drive signal, and the excitation control, the two driver elements D1 and D2 perform the first change from the first phase. The flap motor M1, which is a two-phase stepping motor having up to four phases, can be rotationally driven by 1-2 phase excitation.

  Next, drive control of the entire flap motors M1 to M4 will be described. FIG. 9 is a schematic diagram showing a driver circuit 111 for driving control of the flap motors M1 to M4.

  When driving and controlling all of the flap motors M1 to M4, the circuit configuration shown in FIG. 9 is adopted. The connection between the changeover switches S1 and S2 and the flap motor M1 is the same as the connection shown in FIG.

  The first phase of the flap motor M2 branches from the wiring connecting the switching contact C1 of the changeover switch S1 and the switching contact C4 of the changeover switch S2 and the first phase of the flap motor M1, and is connected to the wiring. Has been. That is, the first phase of the flap motor M2 is also connected to the changeover contact C1 of the changeover switch S1 and the changeover contact C4 of the changeover switch S2, similarly to the flap motor M1.

  The second phase of the flap motor M2 branches from the wiring connecting the switching contact C2 of the changeover switch S1 and the switching contact C1 of the changeover switch S2 and the second phase of the flap motor M1, and is connected to the wiring. Yes. That is, the second phase of the flap motor M2 is also connected to the switching contact C2 of the changeover switch S1 and the changeover contact C1 of the changeover switch S2, similarly to the flap motor M1.

  The third phase of the flap motor M2 branches from the wiring connecting the switching contact C3 of the changeover switch S1 and the switching contact C2 of the changeover switch S2 and the third phase of the flap motor M1, and is connected to the wiring. Yes. That is, the third phase of the flap motor M2 is also connected to the switching contact C3 of the changeover switch S1 and the changeover contact C2 of the changeover switch S2, similarly to the flap motor M1.

  The fourth phase of the flap motor M2 is branched from the wiring connecting the switching contact C4 of the changeover switch S1 and the switching contact C3 of the changeover switch S2 and the fourth phase of the flap motor M1, and is connected to the wiring. Yes. That is, the fourth phase of the flap motor M2 is also connected to the changeover contact C4 of the changeover switch S1 and the changeover contact C3 of the changeover switch S2, similarly to the flap motor M1.

  The respective phases of the flap motors M3 and M4 are also connected to the respective switching contacts of the changeover switches S1 and S2 in the same manner as the respective phases of the flap motor M2. That is, the flap motors M2 to M4 are also connected to the switching contacts of the changeover switches S1 and S2 similar to the flap motor M1.

  Further, in the flap motors M1 to M4, the wirings on the side opposite to the side connected to the changeover switches S1 and S2 are connected to the power supply line 17 connected to the power supply Vcc.

  The flap motors M1 to M4 are provided with opening / closing switches Sw11 to Sw14 on each wiring connected to the power supply line 17. The open / close switches Sw11 to Sw14 are switches that switch connection / disconnection between the flap motor connected to the open / close switch and the power source Vcc.

  The microcomputer 101 outputs an open / close signal indicating that the switch is open or closed to the open / close switches Sw11 to Sw14. The harness L1 further includes an open / close signal sending line l8 for sending the open / close signal from the microcomputer 101 to the open / close switches Sw11 to Sw14 on the decorative panel 11 side. The open / close signal is a 1-bit signal of the open / close switches Sw11 to Sw14. Thereby, the microcomputer 101 controls the opening / closing of the open / close switches Sw11 to Sw14 according to the output of the open / close signal.

  When driving the flap motors M1 to M4, both the two-phase excitation and the 1-2 phase excitation are performed by the microcomputer 101 by outputting the same drive signal and switch switching signal as in the case of driving the flap motor M1 described above. Flap motors M1 to M4 are driven and controlled. Since the flap motors M1 to M4 adopt the circuit configuration shown in FIG. 9, the flap motors M2 to M4 are also controlled by the microcomputer 101 in the same manner as when the flap motor M1 is driven. Works as well.

  At this time, the microcomputer 101 drives the flap motor to be driven by closing the open / close switch of only the flap motor to be driven among the open / close switches Sw11 to Sw14 and connecting it to the power source Vcc by the output of the open / close signal. And the number thereof can be varied. For example, the microcomputer 101 can drive all the flap motors M <b> 1 to M <b> 4 simultaneously when all the open / close switches Sw <b> 11 to Sw <b> 14 are closed by the output of the open / close signal.

  Next, the drive control system of the dust removal mechanism 500 will be described in addition to the drive control system of the flap 15 in the indoor unit 1. FIG. 10 is a schematic diagram illustrating a drive control system of the flap 15 and the dust removing mechanism 500 in the indoor unit 1. In addition, description is abbreviate | omitted about the structure similar to the content already demonstrated in FIG.

  In the indoor unit 1, a dust removing mechanism 500 is disposed at a predetermined position outside the casing 10 (see, for example, FIGS. 1 to 3). The dust removal mechanism 500 includes a driver circuit 121 that drives and controls each mechanism of the dust removal mechanism 500 and a connector 122. A harness L2 connected to the driver board 110 for driving control of the flap 15 is connected to the connector 122. The connector 122 is connected to the driver circuit 121. The harness L2 has a drive signal line, and the harness L2 is connected between the connector 102 on the driver board 110 for driving the flap 15 and the connector 122 on the drive control side of the dust removing mechanism 500, so that both By connecting the connector, the drive signal for driving control of the dust removing mechanism 500 sent from the microcomputer 101 of the indoor control board 100 is used for controlling the driving of the dust removing mechanism 500 via the driver board 110 for driving the flap 15. To the driver circuit 121.

  The driver circuit 121 is connected to and drives the filter motor M5, the brush motor M6, and the damper motor M7. The filter motor M5 is a drive source of the air filter 30. The brush motor M6 is a drive source of the rotating brush 51 of the dust removing device 50. The damper motor M7 is a drive source of a damper that is an air volume adjusting mechanism. In the present embodiment, the air filter 30 is an example of an actuator (dust removal member), and the filter motor is an example of a dust removal mechanism motor. The rotating brush 51 is an example of an actuator (dust removing member), and the brush motor M6 is an example of a dust removing mechanism motor. The damper is an example of an actuator (dust removing member), and the damper motor M7 is an example of a dust removing mechanism motor.

  Further, the driver circuit 121 is connected to the light emitting diode LD, the phototransistor PT, the filter limit switch SW1, and the damper limit switch SW2. The driver circuit 121 controls driving and non-driving of the light emitting diode LD, and switches on / off the phototransistor PT, the filter limit switch SW1, and the damper limit switch SW2.

  Further, the output sides of the phototransistor PT, the filter limit switch SW1, and the damper limit switch SW2 are connected to the connector 122 by an input signal line l6. The outputs of the phototransistor PT, the filter limit switch SW1, and the damper limit switch SW2 are sent via the input signal line 16, the harness L2 connected to the connector 122, and the harness L1 connected to the indoor control board 100 on the casing 10 side. To the microcomputer 101 on the room control board 100.

  A driving circuit according to an embodiment of the present invention includes a microcomputer (driving signal output unit, switching signal output unit, opening / closing signal output unit, control unit) 101, a driver element D and a switching switch S1 in the driver circuit 111 of the decorative panel 11. , S2 and a driver circuit 121 of the dust removing mechanism 500.

  Next, the drive circuit of the flap 15 and the dust removing mechanism 500 in the indoor unit 1 will be described. FIG. 11 is a schematic diagram illustrating the configuration of the drive circuit of the flap 15 and the dust removing mechanism 500 in the indoor unit 1. Note that a description of the same configuration as that illustrated in FIG. 9 is omitted. FIG. 11 shows an example in which the driver circuit 111 for driving control of the flap 15 and the driver circuit 121 for driving control of the dust removing mechanism 500 are shared by one driver circuit 200.

  In the example of the drive circuit of the flap 15 and the dust removing mechanism 500 in the indoor unit 1 shown in FIG. 11, the drive control side of the flap motors M1 to M4 is the switching contacts C1 to C1 of the changeover switches S1 and S2 shown in FIG. This is the same as the connection between C4 and each phase of the motor.

  The drive control side of the dust removal mechanism 500 includes driver elements D1 and D2 that are shared with the drive control of the flap motors M1 to M4, and changeover switches S3 to S5 for drive control of the dust removal mechanism 500. . Further, on the drive control side of the dust removal mechanism 500, a driver element D3 is provided to control the light emitting diode LD, the phototransistor PT, the filter limit switch SW1, and the damper limit switch SW2 by switching control of the switching switch S5. Yes. A drive signal line l3 is connected to the driver element D3. The control signal line of the harness L1 and the drive signal line l3 are used to drive the light emitting diode LD, the phototransistor PT, the filter limit switch SW1, and the damper limit switch SW2 sent from the microcomputer 101 of the indoor control board 100. Each drive signal is input to the driver element D3.

  The changeover switches S3 and S4 are provided for each of the two driver elements D1 and D2. Each changeover switch S3, S4 has one common contact C0 and changeover contacts C5-C8, respectively. The common contact C0 of each changeover switch S3, S4 is connected to a predetermined driver element (in this embodiment, the changeover switch S3 is the driver element D1 and the changeover switch S4 is the driver element D2) of the driver elements D1, D2. Has been.

  The switching contacts C5 to C8 of the changeover switch S3 are connected to the positive side or the negative side of each phase of the filter motor M5, the brush motor M6, and the damper motor M7 (that is, one of the first phase to the fourth phase). Has been. Further, the switching contacts C5 to C8 of the changeover switch S4 are connected to the switching contacts C5 to C8 of the changeover switch S3 to the switching contacts having the same numbers as the switching contacts C5 to C8 of the changeover switch S3. It is connected to the phase excited next to the phase of the filter motor M5, the brush motor M6, and the damper motor M7.

  For example, as shown in FIG. 11, when the switching contact C5 of the changeover switch S3 is connected to the first phase of the filter motor M5, the switching contact C5 of the changeover switch S4 is connected to the second phase of the filter motor M5. . Similarly, the switching contact C6 of the changeover switch S3 is connected to the second phase of the filter motor M5, and the switching contact C6 of the changeover switch S4 is connected to the third phase of the filter motor M5. The switching contact C7 of the changeover switch S3 is connected to the third phase of the filter motor M5, and the switching contact C7 of the changeover switch S4 is connected to the fourth phase of the filter motor M5. The switching contact C8 of the changeover switch S3 is connected to the fourth phase of the filter motor M5, and the switching contact C8 of the changeover switch S4 is connected to the first phase of the filter motor M5.

  Each phase of the brush motor M6 and the damper motor M7 is also connected to each switching contact of the changeover switches S3 and S4 in the same manner as each phase of the filter motor M5.

  The switch change signal sent from the microcomputer 101 of the indoor control board 100 is also sent to the changeover switches S3 and S4. This switch switching signal is a signal for instructing which of the switching contacts C5 to C48 is connected to the common contact C0 in each of the switching switches S3 and S4. That is, each change-over switch S3, S4 switches which of the common contacts C0 is connected to the switch contacts C5 to C8 according to the switch change signal.

  Further, in the filter motor M5, the brush motor M6, and the damper motor M7, the wirings on the side opposite to the side connected to the changeover switches S3 and S4 are connected to the power source line 17 connected to the power source Vcc.

  The filter motor M5, the brush motor M6, and the damper motor M7 are provided with open / close switches Sw15 to Sw17 on each wiring connected to the power supply line l7. The open / close switches Sw15 to Sw17 are switches that switch connection and disconnection between the filter motor M5, the brush motor M6, and the damper motor M7 and the power source Vcc.

  The microcomputer 101 also outputs an open / close signal indicating that the switch is open or closed to the open / close switches Sw15 to Sw17. Thereby, the microcomputer 101 controls the opening / closing of the open / close switches Sw15 to Sw17 by the output of the open / close signal.

  When driving the filter motor M5, the brush motor M6, and the damper motor M7, both the two-phase excitation and the 1-2 phase excitation are performed by outputting the same drive signal and switch switching signal as in the case of driving the flap motor M1 described above. The microcomputer 101 drives and controls the filter motor M5, the brush motor M6, and the damper motor M7. Since the filter motor M5, the brush motor M6, and the damper motor M7 adopt the circuit configuration shown in FIG. 11, the brush motor M6 and the damper motor M7 are also filtered by the same drive control by the microcomputer 101 as when the filter motor M5 is driven. The same operation as the motor M5 is performed.

  At this time, the microcomputer 101 selects the motor to be driven by closing the open / close switch for only the motor to be driven among the open / close switches Sw15 to Sw17 and connecting it to the power source Vcc based on the output of the open / close signal. Can do. For example, the microcomputer 101 can drive all of the filter motor M5, the brush motor M6, and the damper motor M7 simultaneously when all of the open / close switches Sw15 to Sw17 are closed by the output of the open / close signal.

  The changeover switch S5 includes changeover contacts C11 to C14. The light emitting diode LD is connected to the switching contact C11 of the switch S5, the phototransistor PT is connected to the switching contact C12, the filter limit switch SW1 is connected to the switching contact C13, and the damper limit switch is connected to the switching contact C14. SW2 is connected.

  When connecting to the light emitting diode LD, the phototransistor PT, the filter limit switch SW1, or the damper limit switch SW2, the microcomputer 101 switches the switch switching signal for connecting the common contact C0 of the changeover switch S5 to the switching contact corresponding to each of the above parts. Output to switch S5. For example, the switch switching signal uses the same logic as the signal contents shown in FIGS. 7 and 8 for the switching contacts C5 to C8.

  When driving the light emitting diode LD, the microcomputer 101 sends a switch switching signal for connecting the common contact C0 of the changeover switch S5 to the switching contact C11, and in this state, driving to turn on (drive) the light emitting diode LD. Send a signal. When driving the phototransistor PT, the microcomputer 101 sends a switch switching signal for connecting the common contact C0 of the changeover switch S5 to the switching contact C12. In this state, the microcomputer 101 sends a drive signal for turning on (driving) the phototransistor PT. Send it out. When driving the filter limit switch SW1, the microcomputer 101 sends a switch switching signal for connecting the common contact C0 of the changeover switch S5 to the changeover contact C13, and in this state, the drive for turning on (driving) the filter limit switch SW1. Send a signal. When the microcomputer 101 drives the damper limit switch SW2, the microcomputer 101 sends a switch switching signal for connecting the common contact C0 of the changeover switch S5 to the switching contact C14. In this state, the damper limit switch SW2 is turned on (driven). Send drive signal.

  The present invention is not limited to the configuration of the above embodiment, and various modifications can be made. For example, in the above-described embodiment illustrated in FIGS. 5 to 9, the actuator and the drive source thereof are the flap 15 and the flap motors M1 to M4. However, the present invention is not limited to this. For example, the target of drive control by the microcomputer 101 may be the dust removal mechanism 500, and the actuator and its drive source may be the filter and filter motor M5, the rotating brush 51 and brush motor M6, and the damper and damper motor M7. In this case, the circuit configuration in which the filter motor M5, the brush motor M6, and the damper motor M7 are connected to the changeover switches S1 and S2 by connecting the changeover switches S1 and S2 and the motor phases similar to the schematic diagram shown in FIG. Is taken. When the motors M5 to M7 are driven, the microcomputer 101 receives both a drive signal and a switch switching signal from the microcomputer 101, which are the same as those for driving the flap motor M1. Drive control of each motor M5-M7 is performed by the output. For example, the microcomputer 101 outputs the same outputs as the drive signals and switch switching signals to the flap motors M1 to M3 shown in FIGS. 7 and 8 for driving the motors M5 to M7.

  In the embodiment described with reference to FIG. 11, in the dust removal mechanism 500, the microcomputer 101 and the driver circuit 200 control the light emitting diode LD, the phototransistor PT, the filter limit switch SW1, and the damper limit switch SW2. However, the present invention is not limited to this. For example, in this case, a configuration in which the microcomputer 101 and the driver circuit 200 do not control the light emitting diode LD, the phototransistor PT, the filter limit switch SW1, and the damper limit switch SW2 is also an embodiment of the present invention.

  The configuration and processing shown in FIGS. 1 to 11 are only one embodiment of the present invention, and the present invention is not limited to this and can be modified as appropriate.

1 indoor unit 10 casing 11 decorative panel 14 outlet 15 flap 21 indoor fan 100 indoor control board 101 microcomputer 102 connector 110 driver board 111 driver circuit 112 connector 121 driver circuit 122 connector 500 dust removal unit S1, S2 changeover switch C0 common contact C1 ˜C4 switching contacts D, D1, D2 driver elements L1, L2 harnesses l1, l2 drive signal line l6 input signal line l7 power line l8 switching signal sending line LD light emitting diode M1-M4 flap motor M5 filter motor M6 brush motor M7 damper motor PT Phototransistor SW1 Filter limit switch SW2 Damper limit switch Sw11 to Sw17 Open / close switch
Vcc power supply

Claims (4)

A drive circuit for driving m two-phase stepping motors provided for each of the m (m is an integer of 2 or more) actuators provided in the indoor unit of the air conditioner,
Two driver elements for supplying current to the two-phase stepping motor;
A control unit for controlling the driving of the two-phase stepping motor;
Two change-over switches provided between the two-phase stepping motor and the driver element and having at least four change-over contacts numbered as one common contact and a serial number;
A power line connected to each of the two-phase stepping motors for supplying power to the two-phase stepping motor;
On each wiring connected to the power line for each two-phase stepping motor, m open / close switches provided for each two-phase stepping motor,
In one of the two change-over switches, each of the change-over contacts is connected to each phase of the two-phase stepping motor in a one-to-one relationship, and the other of the two change-over switches is the one of the one change-over switches. Each of the switching contacts having the same number as each of the switching contacts of the selector switch is in each of the phases excited next to the phase of each of the two-phase stepping motors to which the switching contacts of the one switching switch are connected. Connected one-to-one,
The controller is
A drive signal output unit for outputting a drive signal for driving each of the two-phase stepping motors to each of the driver elements;
Assuming that the common contacts of the two changeover switches are connected to the changeover contacts having the same number by the two changeover switches, a switch changeover signal for sequentially switching the connection to each changeover contact is output to the changeover switch. A switching signal output unit;
A drive circuit comprising: an open / close signal output unit that outputs an open / close signal for controlling the open / close of each of the open / close switches to the open / close switches.   2. The drive circuit according to claim 1, wherein the driver element operates, as the two-phase stepping motor, a flap motor that drives, as the actuator, a flap that changes a wind direction of conditioned air blown from the indoor unit into the air-conditioned room. . The driver element removes p dust removals that drive p (p is an integer of 2 or more) dust removal members that remove dust attached to a filter that captures dust contained in air in the air-conditioned room sucked by the fan. Connected to the mechanism two-phase stepping motor,
The drive circuit according to claim 2, wherein the two-phase stepping motor for the dust removal mechanism is electrically connected to the control unit via a driver board on which the driver element is provided.   The driver element operates, as the two-phase stepping motor, a dust removing mechanism motor that drives, as the actuator, a dust removing member that removes the dust attached to a filter that captures dust contained in air in the air-conditioned room sucked by a fan. The drive circuit according to claim 1.

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