JP5530494B2 - Single phase motor drive - Google Patents

Description

  The present invention relates to a drive device, and more particularly to a single-phase motor drive device.

A motor (electric motor) is also called an electric motor or an electric motor, and is an electric device that is widely applied to various electric appliances and used to drive other devices. The motor can convert electrical energy into mechanical energy and drive the machine to perform rotational motion, vibration, or linear motion. A motor that performs linear motion is called a linear motor (LINEAR MOTOR), and is applied to the semiconductor industry, automation industry, machine tool, industrial equipment, instrument industry, and the like.
Applications of motors that perform rotational movement are widespread in various industries, offices, homes, and the like. There are many types of motors, roughly divided into AC motors and DC motors, which are used in different situations. A direct current motor uses a direct current power supply as a power source, and a permanent magnet beside the coil generates a torque by electromagnetic induction and rotates by passing a current through the coil. Since the rotational speed of the AC motor is proportional to the frequency, the higher the frequency, the higher the rotational speed. AC motors and DC motors are also indispensable roles in motor control technology, and will continue to drive the development of each industry in the future.

A general single-phase motor drive circuit used for a single-phase AC motor will be described with reference to FIGS. 1A to 1D. In FIG. 1A, the first switching circuit 10, the second switching circuit 12, the third switching circuit 14, the fourth switching circuit 16, and the single-phase motor 100 constitute a single-phase motor drive circuit.
Next, a description will be given with reference to FIG. 1B. When the AT pin is at a high potential and BT is at a low potential, the current flow direction mp1 flows from the power source to Qt3 through the single-phase motor 100 to Qt6 as shown in FIG. 1C. Can rotate 180 degrees. When the AT pin is at a low potential and BT is at a high potential, as shown in FIG. 1D, the current flow direction mp2 flows from the power source to Qt4 through the single-phase motor to Qt5. At this time, the single-phase motor 100 is It can be rotated 180 to 360 degrees. Therefore, the single-phase motor 100 rotates through the first switching circuit 10, the second switching circuit 12, the third switching circuit 14, and the fourth switching circuit 16.

There are several problems with the prior art.
1. Since the control switch is controlled by a bipolar junction transistor (BJT), a voltage drop occurs in the bipolar junction transistor (BJT), and when the voltage drop of the bipolar junction transistor (BJT) is subtracted from the total voltage, It becomes the voltage of the single phase motor. The main issue is how to reduce the voltage drop of the transistor of the power switch and improve the motor driving torque.
2. Since the driving of the upper and lower arm MOS gates of the H-Bridge drive circuit must take into account the RC effect of the drive circuit, the first switching circuit 10, the second switching circuit 12, or the third switching circuit 14, The switching circuits 16 may be simultaneously turned on to generate a short-circuit current and burn out the plurality of switching circuits.
3. Since the conventional single-phase motor driving circuit requires six transistors or eight transistors, how to reduce the cost is a main problem at present.

  Therefore, in view of the problems of the single-phase motor driving circuit as described above, it is a research object of the single-phase motor driving circuit to solve these problems.

The present invention provides a single-phase motor driving apparatus, receives a first driving circuit connected to a first power source and a first side of a single-phase motor, a second driving signal, and the first driving circuit. And the second drive circuit connected to the ground, the second power source, the first drive circuit, and the first side of the single-phase motor, and when the first drive signal becomes high potential, A first bootstrap circuit for providing a bias to the first drive circuit to conduct the first drive circuit; a third drive circuit connected to the first power supply and the second side of the single-phase motor; A first driving signal, a fourth driving circuit connected to the third driving circuit and the ground, a second power source, a third driving circuit, and a second side of the single-phase motor; A second bootstrap that provides a second bias to the third drive circuit and causes the third drive circuit to conduct when the drive signal of the first drive signal becomes a high potential. And a road.
When the first drive signal is at a high potential and the second drive signal is the first pulse width modulation signal, the second drive circuit is connected to the first drive circuit based on the first pulse width modulation signal. Controls blocking or conduction. When the first drive circuit is turned on, the current supplied by the first power supply flows to the ground via the first drive circuit, the single-phase motor, the second bootstrap circuit, and the fourth drive circuit. Rotate single phase motor.
When the second drive signal is at a high potential and the first drive signal is the second pulse width modulation signal, the fourth drive circuit is connected to the third drive circuit based on the second pulse width modulation signal. Controls blocking or conduction. When the third drive circuit is turned on, the current supplied by the first power supply flows to the ground via the third drive circuit, the single-phase motor, the first bootstrap circuit, and the second drive circuit. Rotate single phase motor.

  Therefore, the main effects of the present invention are as follows. 1. improving motor torque; 2. Ensure that there is no risk of H-Bridge upper and lower arm switches conducting simultaneously in the hardware circuit design, avoiding circuit burnout due to short circuit effects; The cost of the drive circuit plan may be reduced.

  Hereinafter, in order to make the objects, features, and advantages of the present invention clearer and easier to understand, a plurality of preferred embodiments will be described with reference to the accompanying drawings.

It is a figure which shows the single phase motor drive circuit of a prior art. It is a figure which shows the single phase motor drive signal of a prior art. It is a figure which shows the path | route of the single phase motor drive circuit of a prior art. It is a figure which shows the path | route of the single phase motor drive circuit of a prior art. 1 is a block diagram showing a first embodiment of a single-phase motor drive circuit according to the present invention. 1 is a circuit diagram of a first embodiment of a single-phase motor driving circuit according to the present invention. FIG. It is a figure which shows the 1st path | route of the 1st Example of the single phase motor drive circuit which concerns on this invention. It is a figure which shows the pulse width modulation of the 1st Example of the single phase motor drive circuit based on this invention. It is a figure which shows the 2nd path | route of the 1st Example of the single phase motor drive circuit which concerns on this invention. It is a block diagram which shows the 2nd Example of the single phase motor drive circuit which concerns on this invention. It is a figure which shows the 1st path | route of the 2nd Example of the single phase motor drive circuit which concerns on this invention. Therefore, it is a figure which shows the 2nd path | route of the 2nd Example of the single phase motor drive circuit based on this invention. It is a circuit diagram of the 3rd example of a single phase motor drive circuit concerning the present invention.

  Next, a block diagram showing a first embodiment of the single-phase motor driving circuit according to the present invention will be described with reference to FIG. 2A. The single-phase motor drive apparatus of the present invention receives the first drive circuit 20 connected to the first power source Vcc1 and the first side of the single-phase motor 100, the second drive signal, and the first drive. The second drive circuit 30 connected to the circuit 20 and the ground, the second power supply Vcc2, the first drive circuit 20, and the first side of the single-phase motor 100 are connected, and the first drive signal becomes a high potential. The first bootstrap circuit 40 for providing the first bias to the first drive circuit 20 to conduct the first drive circuit 20, the first power supply Vcc1, and the second side of the single-phase motor. The third drive circuit 60 to be connected, the fourth drive circuit 70 that receives the first drive signal and is connected to the third drive circuit 60 and the ground, the second power supply Vcc2, and the third drive circuit 60 is connected to the second side of the single-phase motor 100 and the second drive signal becomes a high potential. And a second bootstrap circuit 80 to conduct the third driving circuit 60 to provide a second bias to the third driving circuit 60.

When the first drive signal is at a high potential and the second drive signal is the first pulse width modulation signal, the second drive circuit 30 is based on the first pulse width modulation signal. Controls the interruption or conduction of 20. When the first drive circuit 20 is turned on, the current supplied by the first power supply Vcc1 passes through the first drive circuit 20, the single-phase motor 100, the second bootstrap circuit 80, and the fourth drive circuit 70. Then, it flows to the ground and drives the rotation of the single-phase motor 100.
When the second drive signal is at a high potential and the first drive signal is the second pulse width modulation signal, the fourth drive circuit 70 generates a third drive circuit based on the second pulse width modulation signal. 60 cut-off or conduction is controlled. When the third drive circuit 60 is turned on, the current supplied by the first power supply Vcc1 passes through the third drive circuit 60, the single-phase motor 100, the first bootstrap circuit 40, and the second drive circuit 30. Then, the rotation of the single-phase motor 100 is driven through the second drive circuit 30.

(First embodiment)
Next, a circuit diagram of a first embodiment of the single-phase motor 100 driving circuit according to the present invention will be described with reference to FIG. 2B. In this embodiment, the first power supply Vcc1 and the second power supply Vcc2 employ the same power supply Vcc. The first drive circuit 20 is an N-channel first field effect transistor Q1, the first end of the first field effect transistor Q1 is a drain electrode, the second end of the first field effect transistor Q1 is a gate electrode, The third end of the first field effect transistor Q1 is a source electrode.

The second drive circuit 30 has a first terminal connected to the first drive circuit 20, a third terminal connected to the ground, a second field effect transistor Q2, and a first terminal connected to the second drive circuit 20. Of the second field effect transistor Q2, and the second end of the second field effect transistor Q2 is connected to the second end of the second field effect transistor Q2. And a sixth resistor R6 having a second end connected to the ground.
The second field effect transistor Q2 is an N-channel field effect transistor, the first end of the second field effect transistor Q2 is a drain electrode, the second end of the second field effect transistor Q2 is a gate electrode, The third end of the second field effect transistor Q2 is a source electrode. The second drive signal PWM2 connects the gate electrode voltage divided by the seventh resistor R7 and the sixth resistor R6 to the second end (gate electrode) of the second field effect transistor Q2 to generate a second electric field. The effect transistor Q2 is turned on.

  The first bootstrap circuit 40 includes a first diode D1 whose first end is connected to the power supply Vcc, a first end connected to the second end of the first diode D1, and a second end thereof. Is a first resistor R1 connected to the second end of the first drive circuit 20, its first end is N-type, its second end is P-type, and its first end is the first drive A first Zener diode ZD1 is connected to the second end of the circuit 20 and the second end is connected to the first side of the single-phase motor 100, and the first end is the first end of the first resistor R1. The first capacitor C1 is connected to the second end of the first diode D1, and the second end is connected to the first side of the single-phase motor 100.

  The third drive circuit 60 is an N-channel third field effect transistor Q3. The first end of the third field effect transistor Q3 is a drain electrode, the second end of the third field effect transistor Q3 is a gate electrode, and the third end of the third field effect transistor Q3 is a source electrode.

  The fourth drive circuit 70 has a first terminal connected to the third drive circuit 60, a third field connected to the ground, a fourth field effect transistor Q4, and a first terminal connected to the first drive. Drive resistor PWM1 having a second terminal connected to the second terminal of the fourth field effect transistor Q4 and a first terminal connected to the second field effect transistor Q4. And a ninth resistor R9 having a second end connected to the ground. The fourth field effect transistor Q4 is an N-channel field effect transistor, the first end of the fourth field effect transistor Q4 is a drain electrode, the second end of the fourth field effect transistor Q4 is a gate electrode, The third end of the fourth field effect transistor Q4 is a source electrode. The first drive signal PWM1 connects the gate electrode voltage divided by the eighth resistor R8 and the ninth resistor R9 to the second end (gate electrode) of the second field effect transistor Q4, thereby generating a fourth electric field. The effect transistor Q4 is turned on.

  The second bootstrap circuit 80 has a first end connected to the power supply Vcc, a second diode D2 connected to the power supply Vcc, a first end connected to the second end of the second diode D2, and the second end Is a second resistor R2 connected to the second end of the third drive circuit 60, its first end is N-type, its second end is P-type, and its first end is the third drive A second Zener diode ZD2 is connected to the second end of the circuit 60, and the second end is connected to the second side of the single-phase motor 100. The first end is the first end of the second resistor and the second end. The second capacitor C2 is connected to the second end of the two diodes D2, and the second end is connected to the second side of the single-phase motor 100.

Next, a first path diagram of the first embodiment of the single-phase motor 100 driving circuit according to the present invention will be described with reference to FIG. 2C. Since the control of the motor requires a pulse width modulation (abbreviated as PWM) control signal, the PWM signal waveform is measured in the first embodiment of the single-phase motor driving circuit according to the present invention shown in FIG. 2D. Reference is made to the figure showing the pulse width modulation.
The pulse width modulation PWM is a series of signals whose pulse width can be adjusted. Here, the pulse width modulation PWM is well known to those skilled in the art, and a detailed description thereof will be omitted. When the first drive signal PWM1 is at a high potential and the second drive signal PWM2 is the first pulse width modulation signal, the second field effect transistor Q2 has a second potential based on the first pulse width modulation signal. The field effect transistor Q1 is controlled to be turned off or on. In this case, the relationship between the second drive signal PWM2 and the survey point TQ1 of the gate electrode of the first field effect transistor Q1 is shown in FIGS. 2D and 2C. Refer to it.

When the first drive signal PWM1 becomes a high potential, the second drive signal PWM2 is a first pulse width modulation signal, and when the first pulse width modulation signal becomes a low potential, the second electric field The effect transistor Q2 cannot conduct. When the first driving signal PWM1 becomes a high potential, the gate electrode voltage is generated by dividing the voltage by the eighth resistor R8 and the ninth resistor R9, and Vgs> Vt of the fourth field effect transistor Q4. After the fourth field effect transistor Q4 is turned on, the gate electrode of the third field effect transistor Q3 is connected to the low potential side. In this case, the third field effect transistor Q3 cannot be turned on. It does not flow to the third field effect transistor Q3.
The first bootstrap circuit 40 includes a first diode D1, a first resistor R1, a first capacitor C1, and a first Zener diode ZD1, and a current flows through the first diode D1 to cause the first capacitor C1 is charged, and current also flows through the first resistor R1 and the first Zener diode ZD1, and to the first side of the motor. In this case, the first Zener diode ZD1 generates a bias and applies it to the first field effect transistor Q1. When Vgs> Vt of the first field effect transistor Q1, the first field effect transistor Q1 is turned on. . Therefore, the path path1 through which the current flows flows from the power source of Vcc to the ground via the first field effect transistor Q1, the single-phase motor 100, the second Zener diode ZD2, and the fourth field effect transistor Q4. Can be generated and flow to the single-phase motor 100.

  When the first drive signal PWM1 becomes a high potential, the second drive signal PWM2 becomes the first pulse width modulation signal, and when the first pulse width modulation signal becomes the high potential, the seventh resistor The gate electrode voltage is generated by dividing by R7 and the sixth resistor R6, and Vgs> Vt of the second field effect transistor Q2. After the second field effect transistor Q2 is turned on, the gate electrode of the first field effect transistor Q1 is connected to a low potential, so that the first field effect transistor Q1 is cut off. In this case, since the power source of Vcc does not flow to the first field effect transistor Q1, the path 1 generates a current and does not flow to the single-phase motor 100.

Since the field effect transistor is employed as a switch and the voltage drop of the field effect transistor is small, the operating voltage of the single-phase motor 100 becomes high and the current becomes high. The torque, voltage, and current of the single-phase motor 100 are in a proportional relationship. If the voltage and current are too high, the torque of the single-phase motor 100 is increased. For example, using path 1 as an example, the path through which the current passes includes the first field effect transistor Q 1, the single-phase motor 100, the second Zener diode ZD 2, and the fourth field effect transistor Q 4. Assuming that the current power supply Vcc is 24V, the voltage drop of the first field effect transistor Q1 is 0.1V, the voltage drop of the second Zener diode ZD2 is 0.7V, and the voltage drop of the fourth field effect transistor Q4 is After 0.1V, the voltage drop across the single phase motor 100 is 24 volts, and after subtracting 0.9V (0.7V + 0.1V + 0.1V), the resulting voltage is 23.1V.
This will be described with reference to FIG. In order to subtract a total of 1.6V of two transistor paths from 24 volts in the prior art, the voltage of the obtained single-phase motor 100 was subtracted 1.6V from 24 volts to obtain 22.4 volts. Since the voltage of the single phase motor 100 obtained by operating the present invention is 0.7V higher than that of the prior art, the torque of the single phase motor 100 can be increased by operating the present invention.

Next, a second path diagram of the first embodiment of the single-phase motor driving circuit according to the present invention will be described with reference to FIG. 2E. Since the control of the motor requires a pulse width modulation (abbreviated as PWM) control signal, the PWM signal waveform is measured in the first embodiment of the single-phase motor driving circuit according to the present invention shown in FIG. 2D. Reference is made to the figure showing the pulse width modulation.
When the second drive signal PWM2 is at a high potential and the first drive signal PWM1 is the second pulse width modulation signal, the fourth field effect transistor Q4 has a second potential based on the second pulse width modulation signal. 3 is controlled so as to be turned off or on. In this case, the relationship between the first drive signal PWM1 and the survey point TQ3 of the gate electrode of the third field effect transistor Q3 is shown in FIGS. 2D and 2E. Refer to it.

When the second drive signal PWM2 is at a high potential, the first drive signal PWM1 is the second pulse width modulation signal, and when the second pulse width modulation signal is at a low potential, the fourth electric field The effect transistor Q4 cannot conduct. When the second drive signal PWM2 becomes a high potential, the voltage is divided by the sixth resistor R6 and the seventh resistor R7 to generate a gate electrode voltage, and Vgs> Vt of the second field effect transistor Q2. After the second field effect transistor Q2 is turned on, the gate electrode of the first field effect transistor Q1 is connected to the low potential side. In this case, the first field effect transistor Q1 cannot be turned on, that is, an arbitrary current is generated. It does not flow to the first field effect transistor Q1.
The second bootstrap circuit 80 includes a second diode D2, a second resistor R2, a second capacitor C2, and a second Zener diode ZD2, and a current flows through the second diode D2 and the second capacitor D2. C2 is charged, and current also flows through the second resistor R2 and the second Zener diode ZD2, and to the second side of the motor. In this case, the second Zener diode ZD2 generates a bias and applies it to the third field effect transistor Q3. When Vgs> Vt of the third field effect transistor Q3, the third field effect transistor Q3 becomes conductive. . Therefore, the path path 2 through which the current flows flows from Vcc to the ground via the third field effect transistor Q3, the single-phase motor 100, the first Zener diode ZD1, and the second field effect transistor Q2, and the path 2 generates a current. Then, it can flow to the single-phase motor 100.

  When the second drive signal PWM2 becomes a high potential, the first drive signal PWM1 is a second pulse width modulation signal, and when the second pulse width modulation signal becomes a high potential, an eighth resistor The gate electrode voltage is generated by dividing by R8 and the ninth resistor R9, and Vgs> Vt of the fourth field effect transistor Q4. After the fourth field effect transistor Q4 is turned on, the third field effect transistor Q3 is cut off because the gate electrode of the third field effect transistor Q3 is connected to a low potential. In this case, since the power source of Vcc does not flow to the third field effect transistor Q3, the path 2 generates a current and does not flow to the single-phase motor 100.

  When the present invention is applied to an AC single-phase motor 100, when the first drive signal PWM1 is at a high potential and the second drive signal PWM2 is the first pulse width modulation signal, the single-phase motor 100 is forward biased. Because it receives an electric current, it can rotate 180 degrees. When the first drive signal PWM1 is the second pulse width modulation signal and the second drive signal PWM2 is at a high potential, the single-phase motor 100 receives a reverse bias current, so that it rotates from 180 degrees to 360 degrees. it can. When the signal control of the first drive signal PWM1 and the second drive signal PWM2 is repeated, the single-phase motor 100 can rotate in the forward direction. The present invention can be used not only for AC single-phase motors but also for forward and reverse control of DC single-phase motors.

(Second embodiment)
Next, a block diagram showing a second embodiment of the single-phase motor driving circuit according to the present invention will be described with reference to FIG. 3A. Since the single-phase motor 100 drive circuit must introduce a slight forward current to the ground when the direction of the motor is changed, the arrangement of the first rectifier circuit 50 and the second rectifier circuit 90 can be added. When the first rectifier circuit 50 and the second rectifier circuit 90 are added to the circuit of FIG. 2A, the result is FIG. 3A. The first end of the first rectifier circuit 50 is connected to the first side of the single-phase motor 100, and the second end of the first rectifier circuit 50 is connected to the ground. The first end of the second rectifier circuit 90 is connected to the second side of the single-phase motor 100, and the second end of the second rectifier circuit 90 is connected to the ground.

FIG. 3B is a diagram showing a first path of the second embodiment of the single-phase motor driving circuit according to the present invention. The first rectifier circuit 50 is a third diode D3, the first end of the third diode D3 is N-type, and the second end is P-type. Here, when it is assumed that the current flows to the ground via the first field effect transistor Q1, the single phase motor 100, the second Zener diode ZD2, and the fourth field effect transistor Q4, the single phase motor 100 is When the direction is to be changed, the first field effect transistor Q1 needs to be cut off.
At this time, the forward current is still present when the single-phase motor 100 is turned off due to the inductive load, as understood from Lenz's law, and the forward current flows through the third diode D3. By setting the direction, a loop is formed and an electric current is introduced into the ground to avoid an unstable situation in the single-phase motor. As shown in the tpath1 path of FIG. 3B, the forward current flows in the direction of the ground via the third diode D3, the single-phase motor 100, the second Zener diode ZD2, and the fourth field effect transistor Q4. When the forward current flows, the direction can be officially changed.

FIG. 3C is a diagram showing a second path of the second embodiment of the single-phase motor driving circuit according to the present invention. The second rectifier circuit 90 is a fourth diode D4, the first end of the fourth diode D4 is N-type, and the second end is P-type. Here, assuming that the current flows to the ground via the second field effect transistor Q2, the single phase motor 100, the first Zener diode ZD1, and the second field effect transistor Q2, the single phase motor 100 changes its direction. When the third field effect transistor Q3 is turned off when trying to convert again, the forward current still exists in the single-phase motor 100, and at this time, the fourth diode D4 is set in the direction in which the forward current flows.
As shown in the tpath2 path in FIG. 3C, the forward current flows in the direction of the ground via the fourth diode D4, the single-phase motor 100, the first Zener diode ZD1, and the second field effect transistor Q2. When the forward current flows, the direction can be officially changed.

(Third embodiment)
Next, FIG. 4 is a circuit diagram showing a third embodiment of the single-phase motor driving circuit according to the present invention, and is an embodiment in which the dual power supply mechanism of the present invention is operated. This will be described with reference to FIG. When Vcc1 of the first drive circuit 20 and the third drive circuit 60 is 24V, Vcc2 of the first bootstrap circuit 40 and the second bootstrap circuit 80 can be set to 12V. Employing the dual power supply mechanism allows the single phase motor to operate in a high voltage state.

The present invention provides a new H-Bridge circuit, and a new upper arm circuit of the H-Bridge circuit is composed of a first drive circuit 20 and a third drive circuit 60, and a lower arm circuit is a second drive circuit 30. It consists of a fourth drive circuit 70.
The present invention solves the problem that the first drive circuit 20 and the second drive circuit 30, for example, of the upper arm circuit and the lower arm circuit are turned on simultaneously, and the first drive circuit 30 is turned on when the second drive circuit 30 is turned on. When the drive circuit 20 is always cut off and the second drive circuit 30 is turned off, the first drive circuit 20 is always turned on. Therefore, the first drive circuit 20 and the second drive circuit 30 are in a master-slave relationship, and the second drive circuit 30 determines whether the first drive circuit 20 is turned on or off.
Similarly, the present invention also solves the problem that the third drive circuit 60 and the fourth drive circuit 70 are turned on at the same time. When the fourth drive circuit 70 is turned on, the third drive circuit 60 is always cut off. When the fourth drive circuit 70 is turned off, the third drive circuit 60 is always turned on. Accordingly, the third drive circuit 60 and the fourth drive circuit 70 are in a master-slave relationship, and the fourth drive circuit 70 determines whether the third drive circuit 60 is turned on or off.
For this reason, in the circuit of the present invention, the first drive circuit 20 and the second drive circuit 30 or the third drive circuit 60 and the fourth drive circuit 70 are turned on at the same time, and a short circuit current appears so that the transistors in the drive circuit Will not burn out.

  According to the present invention, there are advantages in that a low cost, a torque improvement can be obtained, and a drive circuit can be protected. In actual operation, the present invention only needs to use two control signals, and the control circuit of the conventional single-phase motor 100 uses four control signals and avoids burning of the single-phase motor 100 drive circuit. The control sequence must be very accurate. According to the present invention, the single-phase motor 100 can be operated simply by controlling the sequence accurately through the control of the drive circuit and simply controlling the two signals.

  It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. It should also be understood that the invention is not limited to the preferred embodiments disclosed herein. Therefore, the patent protection scope of the present invention is based on what is defined in the claims attached to this specification.

DESCRIPTION OF SYMBOLS 10 1st switching circuit 12 2nd switching circuit 14 3rd switching circuit 16 4th switching circuit 20 1st drive circuit 30 2nd drive circuit 40 1st bootstrap circuit 50 1st rectifier circuit 60 Third drive circuit 70 Fourth drive circuit 80 Second bootstrap circuit 90 Second rectifier circuit 100 Single phase motor C1 First capacitor C2 Second capacitor D1 First diode D2 Second diode Dt1 First 1 drive diode Dt2 2nd drive diode Q1 1st field effect transistor Q2 2nd field effect transistor Q3 3rd field effect transistor Q4 4th field effect transistor Qt1 1st drive transistor Qt2 2nd drive transistor Qt3 Third drive transistor Qt4 4 drive transistor Qt5 5th drive transistor Qt6 6th drive transistor R1 1st resistor R2 2nd resistor R6 6th resistor R7 7th resistor R8 8th resistor R9 9th resistor Rt2 2nd Drive resistor Rt3 Third drive resistor Rt4 Fourth drive resistor Rt5 Fifth drive resistor Rt6 Sixth drive resistor Rt7 Seventh drive resistor Rt8 Eighth drive resistor Rt9 Ninth drive resistor ZD1 First Zener diode ZD2 second Zener diode

Claims (11)

A first drive circuit connected to the first power source and the first side of the single-phase motor;
A second drive circuit receiving a second drive signal and connected to the first drive circuit and ground;
A second power source, the first drive circuit, and the first side of the single-phase motor are connected to the first side, and when the first drive signal becomes a high potential, a first bias is applied to the first drive circuit. A first bootstrap circuit provided to conduct the first drive circuit;
A third drive circuit connected to the first power source and the second side of the single-phase motor;
A fourth drive circuit receiving the first drive signal and connected to the third drive circuit and ground;
The second power source, the third drive circuit, and the second phase of the single-phase motor are connected to the second side. When the second drive signal becomes a high potential, a second bias is applied to the third drive. A single-phase motor drive device comprising: a second bootstrap circuit provided to a circuit and conducting the third drive circuit;
When the first drive signal is at a high potential and the second drive signal is a first pulse width modulation signal, the second drive circuit is configured based on the first pulse width modulation signal. When the first drive circuit is turned on, the current supplied by the first power source is controlled by the first drive circuit, the single-phase motor, A second bootstrap circuit, flows to ground via the fourth drive circuit and rotates the single-phase motor;
When the second drive signal is at a high potential and the first drive signal is a second pulse width modulation signal, the fourth drive circuit is based on the second pulse width modulation signal. When the third drive circuit is turned on by controlling the interruption or conduction of the third drive circuit, the current supplied by the first power source is the third drive circuit, the single-phase motor, A single-phase motor driving device, wherein the single-phase motor is rotated by flowing to the ground via the first bootstrap circuit and the second driving circuit.   The first bootstrap circuit has a first end connected to the second power supply, a first diode connected to the second end of the first diode, and a first end connected to the second power supply. Two ends connected to the first driving circuit, a first resistor connected to the first driving circuit, and a second end connected to the first side of the single-phase motor. A first Zener diode, a first end of which is connected to a first end of the first resistor, and a second capacitor of which is connected to the first side of the single-phase motor; The single-phase motor drive device according to claim 1, comprising: The second bootstrap circuit includes a second diode having a first end connected to the second power supply, a first end connected to a second end of the second diode, and a second end of the second bootstrap circuit. Two ends connected to the third drive circuit, a first resistor connected to the third drive circuit, and a second end connected to the second side of the single-phase motor A second Zener diode, a first end of which is connected to the first end of the second resistor, and a second capacitor of which the second end is connected to the second side of the single-phase motor; The single-phase motor drive device according to claim 1, comprising:   The single-phase motor according to claim 1, further comprising a first rectifier circuit having a first end connected to the first side of the single-phase motor and a second end connected to the ground. Drive device.   The single-phase motor according to claim 1, further comprising a second rectifier circuit having a first end connected to the second side of the single-phase motor and a second end connected to the ground. Drive device.   The single-phase motor driving apparatus according to claim 1, wherein the first driving circuit is a first field effect transistor.   The single-phase motor driving apparatus according to claim 1, wherein the third driving circuit is a third field effect transistor.   The second drive circuit includes a second field effect transistor having a first end connected to the first drive circuit and a third end connected to the ground, and a first end connected to the second drive circuit. Receiving a signal, a seventh resistor having a second end connected to the second end of the second field effect transistor, and a first end connected to the second end of the second field effect transistor; The single-phase motor drive device according to claim 1, further comprising a sixth resistor having a second end connected to the ground.   The fourth drive circuit includes a fourth field effect transistor having a first end connected to the third drive circuit, a third end connected to the ground, and a first end connected to the first drive circuit. An eighth resistor that receives the drive signal and has a second end connected to the second end of the fourth field effect transistor and a first end connected to the second end of the fourth field effect transistor The single-phase motor drive device according to claim 1, further comprising: a ninth resistor having a second end connected to the ground.   The single-phase motor driving apparatus according to claim 1, wherein voltages of the first power source and the second power source are the same power source.   The single-phase motor driving device according to claim 1, wherein the voltage of the first power source exceeds the voltage of the second power source.

Images