JP4825866B2 - Single phase motor drive - Google Patents

Description

  The present invention relates to a single-phase motor driving device.

  Hereinafter, a conventional single-phase motor driving device will be described with reference to FIGS. 7 and 8. Here, FIG. 7 is a circuit diagram showing a conventional single-phase motor drive device, and FIG. 8 is a waveform diagram showing a drive waveform of the conventional single-phase motor drive device.

  The NPN bipolar transistor 2 (first discharge side switch element) and the NPN bipolar transistor 4 (first suction side switch element) are supplied with drive signals A and D, so A drive current is supplied in the direction. Therefore, the collector-emitter path of the bipolar transistor 2, the single-phase coil 6, and the collector-emitter path of the bipolar transistor 4 are connected in series between the positive electrode and the negative electrode of the power supply VCC. Similarly, the NPN-type bipolar transistor 8 (second discharge side switch element) and the NPN-type bipolar transistor 10 (second suction side switch element) are supplied with the drive signals C and B, whereby the single-phase coil 6 The drive current is supplied in the left direction of the paper. Therefore, the collector-emitter path of the bipolar transistor 8, the single-phase coil 6, and the collector-emitter path of the bipolar transistor 10 are connected in series between the positive electrode and the negative electrode of the power supply VCC. Then, the bipolar transistors 2 and 4 and the bipolar transistors 8 and 10 are complementarily turned on and off, and the direction of the drive current of the single-phase coil 6 is appropriately changed, whereby the single-phase motor rotates in a predetermined direction.

Further, the change timings of the drive signals A, B, C, and D supplied from the control unit 12 are slightly shifted. That is, when the bipolar transistors 2 and 4 and the bipolar transistors 8 and 10 are complementarily turned on and off, the bipolar transistors 2 and 10 and the bipolar transistors 8 and 4 are slightly turned off at the same time. It is not short-circuited by the through current.
JP-A-7-87775 JP 7-46888 A

  By the way, when the bipolar transistors 2 and 4 are simultaneously turned off, the driving current in the right direction of the single-phase coil 6 tends to continuously flow in the same direction. For this reason, the drive current in the right direction of the drawing of the single-phase coil 6 is based on the kickback voltage appearing on the right side of the drawing of the single-phase coil 6. It is consumed in a short time by circulating through the regeneration path. On the other hand, when the bipolar transistors 8 and 10 are simultaneously turned off, the driving current in the left direction of the single-phase coil 6 continues to flow in the same direction. For this reason, the driving current in the left direction of the single-phase coil 6 is based on the kickback voltage appearing on the left-hand side of the single-phase coil 6, and is a one-dot chain line including the single-phase coil 6, the regenerative diode 18, the power supply VCC, It is consumed in a short time by circulating through the regenerative pathway. That is, each time the bipolar transistors 2 and 4 and the bipolar transistors 8 and 10 are simultaneously turned off, the drive current of the single-phase coil 6 is regenerated through the power supply line 22, so that the voltage on the power supply line 22 fluctuates, There was a problem that the motor drive device malfunctioned.

  Therefore, by providing the capacitor 24, the fluctuation of the voltage on the power supply line 22 is absorbed. However, since the capacity of the capacitor 24 is large, the cost is increased and when the single-phase motor driving device is an integrated circuit, the capacitor 24 becomes an external component.

  The reverse connection prevention diode 26 prevents malfunction of the single-phase motor drive device when the power supply VCC is reversely connected. However, when the reverse connection prevention diode 26 is provided, a regenerative path of a broken line and a one-dot chain line is provided. There was a problem that it could not be formed.

  In view of the above, a single-phase motor driving device according to the present invention includes a first discharge-side switch element and a first suction-side switch element that are connected in series with a single-phase coil and supply a drive current in one direction of the single-phase coil. A second discharge-side switch element and a second suction-side switch element connected in series with the single-phase coil and supplying a drive current in the opposite direction of the single-phase coil, and supplying a drive current in one direction of the single-phase coil A first control element that turns on the first suction-side switch element and a second suction-side switch element that are connected in parallel according to a kickback voltage generated after the first discharge-side switch element is turned off. A first regenerative element in which a drive current in one direction of the single-phase coil flows when the first suction side switch element is turned on, and a kit generated after a drive current is supplied in the reverse direction of the single-phase coil. A second control element that turns on the second suction side switch element according to a back voltage, and a parallel connection with the first suction side switch element, and the second discharge side switch element turns off and the second suction side When the switch element is turned on, the second regenerative element through which the driving current in the reverse direction of the single-phase coil flows is connected to one end of the first discharge side switch element and the second discharge side switch element, and the power supply is reversely connected And a reverse connection prevention element for preventing malfunction of the single-phase motor, wherein when the drive current is supplied in one direction of the single-phase coil, the first discharge side switch element is turned on and off at a predetermined frequency. At the same time, when the first suction side switch element is turned on and the drive current is supplied in the reverse direction of the single-phase coil, the second discharge side switch element is turned on and off at a predetermined frequency. When the first mode for turning on the second suction side switch element and the supply of the drive current in one direction of the single-phase coil are stopped, the first discharge side switch element and the first suction side switch element are When the first suction side switch element is turned on based on the output of the first control element by turning off, and the supply of the drive current in the reverse direction of the single phase coil is stopped, the second discharge side switch element And a control means for executing the second mode in which the second suction side switch element is turned on based on the output of the second control element by turning off the second suction side switch element. It is characterized by.

  The features of the present invention other than those described above will become apparent from the description of this specification and the accompanying drawings.

  According to the present invention, it is possible to suppress voltage fluctuation on the power supply line and to reduce the capacitance of the capacitor provided on the power supply line.

At least the following matters will become clear from the description of the present specification and the accompanying drawings.
=== Summary of disclosure ===

  In the single-phase motor driving apparatus, in the first mode, the driving current in one direction of the single-phase coil when the first discharge-side switch element is turned off is the single-phase coil, the first suction-side switch element. The driving current in the reverse direction of the single-phase coil when the second discharge-side switch element is turned off flows through the path consisting of the first regenerative element is the single-phase coil, the second suction-side switch element, In the second mode, the driving current in one direction of the single-phase coil when the first discharge side switch element and the first suction side switch element are turned off is the single current. The single-phase coil when the second discharge-side switch element and the second suction-side switch element are turned off through a path including a phase coil, the first suction-side switch element, and the first regenerative element. The reverse drive current flows through a path composed of the single-phase coil, the second suction side switch element, and the second regenerative element, and in the third mode, when the first suction side switch element is turned off. The driving current in one direction of the single-phase coil flows through a path including the single-phase coil, the first suction side switch element, the power source, the reverse connection prevention element, and the first discharge side switch element, The drive current in the reverse direction of the single-phase coil when the suction-side switch element is turned off includes the single-phase coil, the second suction-side switch element, the power source, the reverse connection prevention element, and the second discharge-side switch element. It flows through the path consisting of According to this single-phase motor drive device, it is possible to form a plurality of paths through which the drive current of the single-phase coil flows while providing the reverse connection prevention element that prevents the malfunction when the power supply is reversely connected. As a result, it is possible to suppress fluctuations in the voltage on the power supply line and reduce the capacitance of the capacitor provided on the power supply line.

  In the single-phase motor driving device, the first discharge side switch element and the second discharge side switch element are transistors connected by inverted Darlington. According to this single-phase motor drive device, it is possible to reduce the power consumption when the single-phase motor is locked and the drive current of the single-phase coil is regenerated.

  The second mode is when the power supply is turned off or when the direction of the driving current of the single-phase coil is switched.

  A first discharge-side switch element and a first suction-side switch element that are connected in series with the single-phase coil and supply a drive current in one direction of the single-phase coil; and the single-phase coil is connected in series; A second discharge-side switch element and a second suction-side switch element that supply a drive current in the reverse direction of the coil, and the kickback voltage generated after the drive current is supplied in one direction of the single-phase coil, The first control element that turns on the first suction side switch element and the second suction side switch element are connected in parallel. When the first discharge side switch element turns off and the first suction side switch element turns on, the single phase The second regenerative element switches according to a first regenerative element in which a drive current in one direction of the coil flows and a kickback voltage generated after the drive current is supplied in the reverse direction of the single-phase coil. The second control element that turns on the H element and the first suction side switch element are connected in parallel, and when the second discharge side switch element is turned off and the second suction side switch element is turned on, the reverse of the single-phase coil A second regenerative element through which a driving current in a direction flows, and a reverse connection prevention element connected to one end of the first discharge side switch element and the second discharge side switch element to prevent malfunction when a power supply is reversely connected; A driving method of a single-phase motor driving device comprising: when supplying a driving current in one direction of the single-phase coil, the first discharge-side switch element is turned on / off at a predetermined frequency and the first suction-side switch When the element is turned on and the drive current is supplied in the reverse direction of the single-phase coil, the second discharge side switch element is turned on and off at a predetermined frequency and the second suction side switch is turned on. When the element is turned on and the supply of drive current in one direction of the single-phase coil is stopped, the first discharge side switch element and the first suction side switch element are turned off to output the first control element The first suction side switch element is turned on based on the above, and when the supply of the drive current in the reverse direction of the single-phase coil is stopped, the second discharge side switch element and the second suction side switch element are turned off. Thus, when the second suction side switch element is turned on based on the output of the second control element and the single phase motor is locked during the period in which the drive current is supplied in one direction of the single phase coil, the first discharge By turning on the side switch element and the first suction side switch element for a predetermined time, and then turning off the first suction side switch element for a time longer than the predetermined time. The operation of turning on the first suction side switch element based on the output of the first control element is repeated, and when the single phase motor is locked in a period in which a drive current is supplied in the reverse direction of the single phase coil, The operation of turning on the second discharge side switch element and the second suction side switch element for the predetermined time, and then turning off the second suction side switch element for a time longer than the predetermined time, to the output of the second control element Based on this, the operation of turning on the second suction side switch element is repeated. According to this single-phase motor drive method, it is possible to form a plurality of paths through which the drive current of the single-phase coil flows while providing the reverse connection prevention element. Thereby, it is possible to suppress the fluctuation of the voltage on the power supply line and reduce the capacitance of the capacitor provided on the power supply line.

Furthermore, an integrated circuit characterized by having the single-phase motor driving device described above can also be realized. According to this integrated circuit, it is possible to integrate the capacitor provided on the power supply line on the chip. Along with this, it is possible to reduce the size and cost of the single-phase motor drive device.
=== Configuration of Single-Phase Motor Drive Device ===
Hereinafter, the configuration of the single-phase motor driving device of the present invention will be described with reference to FIG. FIG. 1 is a circuit block diagram showing a single-phase motor driving apparatus according to the present invention, in which a current supply path and a regeneration path in the first mode are appended. In the present embodiment, the single-phase motor driving device is an integrated circuit to which the power supply VCC and the single-phase coil are externally connected, and drives a fan motor, for example.

  The PNP type bipolar transistor 102 and the NPN type bipolar transistor 104 (first discharge side switch element) and the NPN type bipolar transistor 106 (first suction side switch element) are supplied with drive signals A and D. The drive current is supplied to the right side of the single-phase coil 108 in the drawing. Therefore, the collector-emitter path of the bipolar transistor 104, the single-phase coil 108, and the collector-emitter path of the bipolar transistor 106 are connected in series between the positive electrode and the negative electrode of the power supply VCC. Similarly, drive signals C and B are supplied to the PNP bipolar transistor 110, the NPN bipolar transistor 112 (second discharge side switch element), and the NPN bipolar transistor 114 (second suction side switch element). Thus, the drive current is supplied to the left side of the single-phase coil 108 in the drawing. Therefore, the collector-emitter path of the bipolar transistor 112, the single-phase coil 108, and the collector-emitter path of the bipolar transistor 114 are connected in series between the positive electrode and the negative electrode of the power supply VCC. Then, the bipolar transistors 104 and 106 and the bipolar transistors 112 and 114 are complementarily turned on and off, and the direction of the driving current of the single-phase coil 108 is appropriately changed, whereby the single-phase motor rotates in a predetermined direction. Since the bipolar transistors 102 and 104 and the bipolar transistors 110 and 112 are in an inverted Darlington connection, drive signals A and C having a minute current value of about several hundred μA are supplied.

The PNP-type bipolar transistor 116 (first control element) turns on the bipolar transistor 106 by turning on according to the kickback voltage appearing on the right side of the single-phase coil 108 in the drawing. Similarly, the PNP-type bipolar transistor 118 (second control element) turns on the bipolar transistor 114 by turning on according to the kickback voltage appearing on the left side of the single-phase coil 108 in the drawing. The regenerative diode 120 is connected in parallel to the collector emitter of the bipolar transistor 114 and regenerates the output current of the bipolar transistor 106. Similarly, the regenerative diode 122 is connected in parallel to the collector emitter of the bipolar transistor 106 and regenerates the output current of the bipolar transistor 114. The capacitor 124 absorbs fluctuations in the voltage on the power supply line. The reverse connection prevention diode 126 prevents malfunction of the single-phase motor driving device when the positive electrode and the negative electrode of the power supply VCC are reversely connected. The control unit 128 (control means) outputs drive signals A, B, C, and D.
=== Operation of Single Phase Motor Drive Device ===
≪First mode (rotation) ≫
Hereinafter, the operation of the single-phase motor driving apparatus of the present invention will be described with reference to FIGS. 1 and 2. FIG. 2 is a diagram illustrating an on / off operation of the bipolar transistor of FIG. In the first mode, the on / off duty of the bipolar transistors 104 and 112 is controlled by PWM (Pulse Width Modulation) to make the rotation speed of the single-phase motor variable.

In the control unit 128, the drive signal A for turning on / off the bipolar transistor 104 at a predetermined frequency (for example, 25 kHz) and the drive signal D for turning on the bipolar transistor 106 are supplied during the period in which the drive current is supplied to the right side of the single-phase coil 108 in the drawing. Is output. Accordingly, the drive current in the right direction of the drawing of the single-phase coil 108 flows through a solid supply path including the bipolar transistor 104, the single-phase coil 108, and the bipolar transistor 106 during the period when the bipolar transistor 104 is turned on, and the bipolar transistor 104 is turned off. During the period, a single-phase coil 108, the bipolar transistor 106, and the regenerative diode 120 flow through a broken-line regeneration path. On the other hand, in the control unit 128, the drive signal C for turning on / off the bipolar transistor 112 at a predetermined frequency (for example, 25 kHz) and the drive for turning on the bipolar transistor 114 are supplied during the period in which the drive current is supplied to the left side of the single-phase coil 108. Signal B is output. Accordingly, the driving current in the left direction of the drawing of the single-phase coil 108 flows through a solid line supply path including the bipolar transistor 112, the single-phase coil 108, and the bipolar transistor 114 during the period when the bipolar transistor 112 is turned on, and the bipolar transistor 112 is turned off. During the period, the single-phase coil 108, the bipolar transistor 114, and the regenerative diode 122 are consumed by flowing through the regenerative path of the one-dot chain line. Thereby, since the drive current of the single-phase coil 108 does not regenerate through the power supply line, it is possible to prevent voltage fluctuation on the power supply line.
≪Second mode (power off, phase switching) ≫
Next, the operation of the single-phase motor driving device of the present invention will be described with reference to FIGS. FIG. 3 is a circuit block diagram showing a single-phase motor driving apparatus according to the present invention, in which a current supply path and a regeneration path in the second mode are added. FIG. 4 is a diagram showing an on / off operation of the bipolar transistor of FIG.

In the control unit 128, when the supply of the drive current to the right side of the drawing of the single-phase coil 108 is stopped, that is, when the power supply VCC is turned off or when the drive current of the single-phase coil 108 is switched to the left side of the drawing. The drive signals A and D for turning off the bipolar transistors 104 and 106 are output. Although the bipolar transistors 104 and 106 are turned off, the driving current in the right direction of the single-phase coil 108 continues to flow in the same direction. Therefore, the bipolar transistor 116 is turned on with the emitter potential rising based on the kickback voltage appearing on the right side of the single-phase coil 108 in the drawing. Further, the bipolar transistor 106 is turned on again when the base potential rises. Accordingly, the drive current in the right direction of the drawing of the single-phase coil 108 is consumed by flowing through a broken line regeneration path composed of the single-phase coil 108, the bipolar transistor 106, and the regenerative diode 120. On the other hand, the control unit 128 switches the drive current of the single-phase coil 108 to the right when the supply of the drive current to the left-hand side of the single-phase coil 108 is stopped, that is, when the power supply VCC is turned off. Drive signals C and B for turning off the bipolar transistors 112 and 114 are output. Although the bipolar transistors 112 and 114 are turned off, the drive current in the left direction of the paper of the single-phase coil 108 continues to flow in the same direction. Therefore, the bipolar transistor 118 is turned on with the emitter potential rising based on the kickback voltage appearing on the left side of the single-phase coil 108 in the drawing. Further, the bipolar transistor 114 is turned on again when the base potential rises. Accordingly, the drive current in the left direction of the drawing of the single-phase coil 108 is consumed by flowing through a one-dot chain regeneration path composed of the single-phase coil 108, the bipolar transistor 114, and the regeneration diode 122. Thereby, since the drive current of the single-phase coil 108 does not regenerate through the power supply line, it is possible to prevent voltage fluctuation on the power supply line.
≪Third mode (Single-phase motor lock protection) ≫
Next, the operation of the single-phase motor driving device of the present invention will be described with reference to FIGS. FIG. 5 is a circuit block diagram showing a single-phase motor driving apparatus according to the present invention, in which a current supply path and a regeneration path in the third mode are added. FIG. 6 is a diagram showing an on / off operation of the bipolar transistor of FIG. When the single-phase motor is locked due to an external factor, the single-phase coil 108 generates heat, thereby preventing the single-phase motor driving device from being heated and destroyed.

  In the control unit 128, when the single-phase motor is locked due to an external factor during the period in which the drive current is supplied to the right side of the single-phase coil 108, the bipolar transistors 104 and 106 are turned on for a predetermined time (for example, 0.5 seconds). Drive signals A and D for repeatedly turning off the bipolar transistor 106 for a time longer than a predetermined time (for example, 5 seconds) are repeatedly output. When the bipolar transistor 106 is turned off, the driving current in the right direction of the single-phase coil 108 continues to flow in the same direction. Therefore, the bipolar transistor 116 is turned on with the emitter potential rising based on the kickback voltage appearing on the right side of the single-phase coil 108 in the drawing. Further, the bipolar transistor 106 is turned on again when the base potential rises. Accordingly, the drive current in the right direction of the drawing of the single-phase coil 108 is consumed by flowing through a broken line regeneration path including the single-phase coil 108, the bipolar transistor 106, the power supply VCC, the reverse connection prevention diode 126, and the bipolar transistor 104. In the process until the bipolar transistor 106 is turned on again, the drive current corresponding to the base current of the bipolar transistor 116 out of the drive current in the right direction of the drawing of the single-phase coil 108 flows through a path including the capacitor 124. On the other hand, the control unit 128 turns on the bipolar transistors 112 and 114 for a predetermined time (for example, 0.5 seconds) when the single-phase motor is locked due to an external factor during the period in which the drive current is supplied to the left of the single-phase coil 108 in the drawing. After that, the drive signals C and B for turning off the bipolar transistor 114 for a time longer than a predetermined time (for example, 5 seconds) are repeatedly output. When the bipolar transistor 114 is turned off, the drive current in the left direction of the single-phase coil 108 continues to flow in the same direction. Therefore, the bipolar transistor 118 is turned on with the emitter potential rising based on the kickback voltage appearing on the left side of the single-phase coil 108 in the drawing. Further, the bipolar transistor 114 is turned on again when the base potential rises. Therefore, the driving current in the left direction of the drawing of the single-phase coil 108 is consumed by flowing through a one-dot chain regeneration path composed of the single-phase coil 108, the bipolar transistor 114, the power supply VCC, the reverse connection prevention diode 126, and the bipolar transistor 112. In the process until the bipolar transistor 114 is turned on again, the drive current corresponding to the base current of the bipolar transistor 118 out of the drive current in the left direction of the single-phase coil 108 flows through the path formed by the capacitor 124. Thereby, the drive current of the single-phase coil 108 can be regenerated through the reverse connection prevention diode 126. In addition, since the bipolar transistors 102 and 104 and the bipolar transistors 110 and 112 are connected by an inverted Darlington connection, it is possible to reduce power consumption and voltage fluctuation on the power supply line.

As described above, since the control unit 128 has logic to output the drive signals A, B, C, and D for executing the first to third modes, the capacitance of the capacitor 124 can be reduced. In particular, when integrating the single-phase motor driving device, the capacitor 124 can be formed on the chip.
=== Other Embodiments ===
The single-phase motor driving device, the single-phase motor driving method, and the integrated circuit according to the present invention have been described above. However, the embodiments of the present invention described above are for facilitating the understanding of the present invention. The invention is not limited. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof.
≪First discharge side, first suction side, second discharge side, second suction side switch element≫
In the present embodiment, the first discharge side, the first suction side, the second discharge side, and the second suction side switch element are bipolar transistors, but are not limited thereto. For example, N-channel or P-channel MOSFETs can be used as the first discharge side, first suction side, second discharge side, and second suction side switch elements.
<< First and second control elements >>
In the present embodiment, the first and second control elements are bipolar transistors, but are not limited thereto. For example, it is possible to use an N-channel type or P-channel type MOSFET that is turned on in response to the kickback voltage.
≪First and second regenerative elements≫
In the present embodiment, the first and second regenerative elements are diode elements provided separately from the first and second suction side switch elements, but are not limited thereto. For example, when the first and second suction side switch elements are bipolar transistors, it is possible to use a parasitic diode of the bipolar transistor as the first and second regenerative elements. This makes it possible to reduce the chip area when the single-phase motor driving device is integrated.
≪Reverse connection prevention element≫
In the present embodiment, the reverse connection preventing element is a diode, but is not limited thereto. For example, it is possible to use a diode-connected bipolar transistor or MOSFET.

1 is a circuit block diagram showing a single-phase motor driving device according to the present invention, in which a current supply path and a regeneration path in a first mode are added. It is a figure which shows the on-off operation | movement of the bipolar transistor of FIG. FIG. 3 is a circuit block diagram showing a single-phase motor driving device according to the present invention, in which a current supply path and a regeneration path in the second mode are added. FIG. 4 is a diagram illustrating an on / off operation of the bipolar transistor of FIG. 3. FIG. 4 is a circuit block diagram showing a single-phase motor driving device according to the present invention, in which a current supply path and a regeneration path in the third mode are added. It is a figure which shows the on-off operation | movement of the bipolar transistor of FIG. It is a circuit diagram which shows the conventional single phase motor drive device. It is a wave form diagram which shows the drive waveform of FIG.

Explanation of symbols

102, 104, 106, 110, 112, 114, 116, 118 Bipolar transistor 108 Single-phase coil
120, 122 Regenerative diode 124 Capacitor 126 Reverse connection prevention diode 128 Control unit

Claims (4)

A first discharge-side switch element and a first suction-side switch element that are connected in series with a single-phase coil and supply a drive current in one direction of the single-phase coil; and connected in series with the single-phase coil; The first suction side switch element and the second suction side switch element that supply the drive current in the reverse direction, and the first suction according to the kickback voltage generated after the drive current is supplied in one direction of the single-phase coil The first control element that turns on the side switch element and the second suction side switch element are connected in parallel, and when the first discharge side switch element is turned off and the first suction side switch element is turned on, the single-phase coil In accordance with a first regenerative element through which a drive current in one direction flows and a kickback voltage generated after supplying the drive current in the reverse direction of the single-phase coil, the second suction side switch element Is connected in parallel with the first suction-side switch element, and when the second discharge-side switch element is turned off and the second suction-side switch element is turned on, the single-phase coil is reversed. A second regenerative element through which a drive current flows; and a reverse connection prevention element connected to one end of the first discharge side switch element and the second discharge side switch element to prevent malfunction when a power supply is reversely connected. A single-phase motor drive device,
When supplying a drive current in one direction of the single-phase coil, the first discharge-side switch element is turned on / off at a predetermined frequency and the first suction-side switch element is turned on, and the drive current is turned in the opposite direction of the single-phase coil. A first mode for turning on and off the second discharge side switch element at a predetermined frequency and turning on the second suction side switch element,
When the supply of the drive current in one direction of the single-phase coil is stopped, the first discharge side switch element and the first suction side switch element are turned off based on the output of the first control element. When the first suction side switch element is turned on and the supply of the drive current in the reverse direction of the single-phase coil is stopped, the second discharge side switch element and the second suction side switch element are turned off to turn on the second A single-phase motor drive device comprising: control means for executing a second mode in which the second suction side switch element is turned on based on an output of the control element. In the first mode, the driving current in one direction of the single-phase coil when the first discharge-side switch element is turned off includes the single-phase coil, the first suction-side switch element, and the first regenerative element. The driving current in the reverse direction of the single-phase coil when flowing through the path and the second discharge-side switch element is turned off is a path composed of the single-phase coil, the second suction-side switch element, and the second regenerative element. flow,
In the second mode, the drive current in one direction of the single-phase coil when the first discharge-side switch element and the first suction-side switch element are turned off is the single-phase coil, the first suction-side switch element. The driving current in the reverse direction of the single-phase coil when the second discharge-side switch element and the second suction-side switch element are turned off flows through the path composed of the first regenerative element, and the single-phase coil, 2. The single-phase motor drive device according to claim 1, wherein the single-phase motor drive device flows through a path including a second suction side switch element and the second regenerative element.   3. The single-phase motor driving device according to claim 1, wherein the first discharge side switch element and the second discharge side switch element are transistors connected by an inverted Darlington connection. 4.   4. The single-phase motor according to claim 1, wherein the second mode is when the power source is turned off or when the direction of the driving current of the single-phase coil is switched. 5. Drive device.

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