TWI455476B - Drive device for single phase motor - Google Patents

Description

Single phase motor drive

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

Electric motors, also known as electric motors or electric motors, are widely used in various electrical appliances to drive electrical equipment from other devices. The motor can convert electrical energy into mechanical energy to drive the machine for rotary motion, vibration or linear motion. The linear motion motor is called LINEAR MOTOR, which is suitable for the semiconductor industry, automation industry, machine tools, industrial machines and instruments. Industry and so on. The motor for rotary motion is used in various industries, offices, homes, etc. There are many types of motors, which are roughly divided into AC motors and DC motors, which can be used in different applications. The DC motor uses DC power as the power source to make the coil pass the current, and there is a permanent magnet next to the coil to electromagnetically induce the rotation to rotate. However, the speed of the AC motor is proportional to the frequency, so the higher the frequency, the faster the speed. AC motors and DC motors have also become an indispensable part of motor control technology, and have also driven the development of various industries in the future.

For single-phase motor drive circuits commonly used for single-phase AC motors, please refer to Figures 1A through 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 driving circuit. Next, please refer to FIG. 1B. When the AT pin is at a high potential and BT is at a low potential, referring to FIG. 1C at this time, the current flow to the mp1 is from the power supply via the Qt3, the single-phase motor 100 to the Qt6, and at this time, the single-phase motor 100 is rotated by 180 degrees. When the AT pin is low and BT is high, refer to Figure 1D. The current flows to the mp2 from the power supply via Qt4, single-phase motor to Qt5. At this time, the single-phase motor 100 rotates 180 degrees to 360 degrees. . Therefore, the single-phase motor 100 is via the first switching circuit 10, The two switching circuit 12, the third switching circuit 14, and the fourth switching circuit 16 rotate the single phase motor 100.

The problems with the prior art are as follows:

1. Because the control switch is controlled by a Bipolar Junction Transistor (BJT), a voltage drop occurs on the transistor (BJT), and all the total voltages are subtracted from the voltage drop of the transistor (BJT), which is the single-phase motor. Voltage. How to reduce the voltage drop of the power switch transistor to improve the motor drive torque is the main issue.

2. H-Bridge drive circuit The upper and lower arm MOS Gate drive takes into account the RC effect of the drive circuit, so it is possible to cause the first switch circuit 10, the second switch circuit 12 or the third switch circuit 14 and the fourth switch circuit 16 to be simultaneously turned on. A short circuit current is generated and a plurality of switching circuits are burned.

3. Previously, single-phase motor drive circuits required six transistors or eight transistors, and how to reduce costs is currently the main issue.

In view of the above problems of single-phase motor drive circuits, how to solve these problems is the purpose of research on single-phase motor drive circuits.

The invention provides a single-phase motor driving device, comprising: a first driving circuit, a second driving circuit, a first bootstrap circuit, a third driving circuit, a fourth driving circuit and a second bootstrap circuit. A first driving circuit is coupled to a first power source and a first side of a single phase motor. The second driving circuit receives a second driving signal and is connected to the first driving circuit and the ground. The first bootstrap circuit is connected to a second power source and the first driving circuit and the first side of the single-phase motor. When the first driving signal is high, the first bootstrap circuit provides a first bias voltage to the first driving circuit. And turning on the first driving circuit. The third drive circuit connects the first power source to the second side of one of the single phase motors. Fourth drive circuit connection Receiving a first driving signal and connecting to the third driving circuit and the ground. The second bootstrap circuit is connected to the second power source and the third driving circuit and the second side of the single-phase motor. When the second driving signal is high, the second bootstrap circuit provides a second bias voltage to the third driving circuit. The third driving circuit is turned on. When the first driving signal is at a high potential and the second driving signal is a first pulse width modulation signal, the second driving circuit controls the first driving circuit to be turned off or turned on according to the first pulse width modulation signal. When the first driving circuit is turned on, the current supplied by the first power source flows through the first driving circuit, the single-phase motor, the second bootstrap circuit, and the fourth driving circuit to the ground end to rotate the single-phase motor. When the second driving signal is high, and the first driving signal is a second pulse width modulation signal, the fourth driving circuit controls the third driving circuit to be turned off or turned on according to the second pulse width modulation signal. When the three driving circuit is turned on, the current supplied by the first power source flows through the third driving circuit, the single-phase motor, the first bootstrap circuit, and the second driving circuit to the ground end to rotate the single-phase motor.

Therefore, the main functions of the invention are: 1. The motor torque is improved, 2. The hardware circuit design ensures that the H-Bridge upper and lower arm switches are not simultaneously turned on, avoiding the burning of the circuit due to the short circuit effect, 3. reducing the driving Circuit solution cost, etc.

The above and other objects, features and advantages of the present invention will become more apparent and understood.

2A is a block diagram of a first embodiment of a single-phase motor driving circuit of the present invention. The single-phase motor driving device of the present invention includes: a first driving circuit 20, a second driving circuit 30, and a first Bootstrap circuit 40, third drive circuit 60, fourth drive circuit 70 and second bootstrap circuit 80. The first driving circuit 20 is connected to a first power source Vcc1 and a first side of a single-phase motor 100. The second driving circuit 30 receives a second driving signal and is connected to the first driving circuit 20 With the ground. The first bootstrap circuit 40 is connected to a second power source Vcc2 and the first driving circuit 20 and the first side of the single-phase motor 100. When the first driving signal is high, the first bootstrap circuit 40 provides a first bias voltage. The first drive circuit 20 is given to turn on the first drive circuit 20. The third driving circuit 60 connects the first power source Vcc1 and one of the second sides of the single-phase motor. The fourth driving circuit 70 receives a first driving signal and is connected to the third driving circuit 60 and the ground. The second bootstrap circuit 80 is connected to the second power source Vcc2 and the third driving circuit 60 and the second side of the single-phase motor 100. When the second driving signal is high, the second bootstrap circuit 80 provides a second bias voltage. The third driving circuit 60 turns on the third driving circuit 60.

When the first driving signal is high, and the second driving signal is a first pulse width modulation signal, the second driving circuit 30 controls the first driving circuit 20 to be turned off according to the first pulse width modulation signal. Or, when the first driving circuit 20 is turned on, the current supplied by the first power source Vcc1 flows through the first driving circuit 20, the single-phase motor 100, the second bootstrap circuit 80, and the fourth driving circuit 70 to the ground, and is driven. The single phase motor 100 rotates. When the second driving signal is high, and the first driving signal is a second pulse width modulation signal, the fourth driving circuit 70 controls the third driving circuit 60 to be turned off or turned on according to the second pulse width modulation signal. When the third driving circuit 60 is turned on, the current supplied by the first power source Vcc1 flows through the third driving circuit 60, the single-phase motor 100, the first bootstrap circuit 40, and the second driving circuit 30 to the ground end, and passes through the second The drive circuit 30 drives the single-phase motor 100 to rotate.

Next, please refer to FIG. 2B which is a circuit diagram of the first embodiment of the single-phase motor 100 driving circuit of the present invention. In this embodiment, the first power source Vcc1 and the second power source Vcc2 use the same power source Vcc. The first driving circuit 20 is a first field effect transistor Q1 of the N channel, the first end of the first field effect transistor Q1 is a drain, and the second end of the first field effect transistor Q1 is a gate. The third end of the first field effect transistor Q1 is the source.

The second driving circuit 30 includes a second field effect transistor Q2, a seventh resistor R7 and a sixth resistor R6. The first end of the second field effect transistor Q2 is connected to the first driving circuit 20, and the third end of the second field effect transistor Q2 is connected to the ground end. The first end of the seventh resistor R7 receives the second driving signal PWM2, and the second end of the seventh resistor R7 is connected to the second end of the second field effect transistor Q2. The first end of the sixth resistor R6 is connected to the second end of the second field effect transistor Q2, and the second end of the sixth resistor is connected to the ground end. The second field effect transistor Q2 is an N-channel field effect transistor, and the first end of the second field effect transistor Q2 is a drain, and the second end of the second field effect transistor Q2 is a gate. The third end of the second field effect transistor Q2 is a source. The second driving signal PWM2 generates a gate voltage via the voltage division of the seventh resistor R7 and the sixth resistor R6 to the second end (gate) of the second field effect transistor Q2 to turn on the second field effect transistor Q2.

The first bootstrap circuit 40 includes a first diode D1, a first resistor R1, a first gate diode ZD1, and a first capacitor C1. The first end of the first diode D1 is connected to the power source Vcc. The first end of the first resistor R1 is connected to the second end of the first diode D1, and the second end of the first resistor R1 is connected to the second end of the first driving circuit 20. The first end of the first genus diode ZD1 is N-type, the second end of the first genus diode ZD1 is P-type, and the first end of the first sigma diode ZD1 is connected to the first driving At the second end of the circuit 20, the second end of the first gated diode ZD1 is coupled to the first side of the single phase motor 100. The first end of the first capacitor C1 is connected to the first end of the first resistor R1 and the second end of the first diode D1, and the second end of the first capacitor C1 is connected to the first side of the single-phase motor 100.

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

The fourth driving circuit 70 includes a fourth field effect transistor Q4, an eighth resistor R8 and a ninth resistor R9. The first end of the fourth field effect transistor Q4 is connected to the third driving circuit 60, and the third end of the fourth field effect transistor Q4 is connected to the ground end. The first end of the eighth resistor R8 receives the first driving signal PWM1, and the second end of the eighth resistor R8 is connected to the second end of the fourth field effect transistor Q4. The first end of the ninth resistor R9 is connected to the second end of the fourth field effect transistor Q4, and the second end of the ninth resistor R9 is connected to the ground end. 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, and the second end of the fourth field effect transistor Q4 is a gate, The third end of the four-effect transistor Q4 is the source. The first driving signal PWM1 generates a gate voltage via the voltage division of the eighth resistor R8 and the ninth resistor R9 to the second end (gate) of the fourth field effect transistor Q4 to turn on the fourth field effect transistor Q4.

The second bootstrap circuit 80 includes a second diode D2, a second resistor R2, a second second-order diode ZD2, and a second capacitor C2. The first end of the second diode D2 is connected to the power source Vcc. The first end of the second resistor R2 is connected to the second end of the second diode D2, and the second end of the second resistor R2 is connected to the second end of the third driving circuit 60. The first end of the second genus diode ZD2 is N-type, the second end of the second genus diode ZD2 is P-type, and the first end of the second genus diode ZD2 is connected to the third driving At a second end of the circuit 60, a second end of the second register diode ZD2 is coupled to a second side of the single phase motor 100. The first end of the second capacitor C2 is connected to the first end of the second resistor and the second end of the second diode D2, and the second end of the second capacitor C2 is connected to the second side of the single-phase motor 100.

Next, please refer to FIG. 2C for a first path diagram of the first embodiment of the single-phase motor 100 driving circuit of the present invention. At the same time, the pulse width modulation is required due to the control of the motor (Pulse Width Modulation (referred to as PWM) control signal, so PWM signal waveform measurement, please refer to the 2D diagram is the pulse width modulation diagram of the first embodiment of the single-phase motor drive circuit of the present invention. The so-called pulse width modulation PWM is a series of signals that can adjust the pulse width, which is well known to those skilled in the art, and will not be described here. When the first driving signal PWM1 is high, and the second driving signal PWM2 is the first pulse width modulation signal, the second field effect transistor Q2 controls the first field power according to the first pulse width modulation signal. The crystal Q1 is turned off or on. At this time, the relationship between the second driving signal PWM2 and the gate measuring point TQ1 of the first field effect transistor Q1, please refer to the 2D and 2C.

When the first driving signal PWM1 is high, the second driving signal PWM2 is the first pulse width modulation signal, and when the first pulse width modulation signal is low, the second field effect transistor Q2 is not turned on. . When the first driving signal PWM1 is at a high potential, a gate voltage is generated via the voltage division of the eighth resistor R8 and the ninth resistor R9, so that Vgs of the fourth field effect transistor Q4 is >Vt. After the fourth field effect transistor Q4 is turned on, the gate of the third field effect transistor Q3 is pulled to the low potential end. At this time, the third field effect transistor Q3 is not turned on, that is, there is no current flow. Pass the third field effect transistor Q3. The first bootstrap circuit 40 is composed of a first diode D1, a first resistor R1, a first capacitor C1 and a first gate diode ZD1, and a current flows through the first diode D1 to the first capacitor. C1 is charged, and current flows through the first resistor R1 and the first arrester diode ZD1 and flows to the first side of the motor. At this time, the first domain diode ZD1 generates a bias voltage to the first field effect transistor Q1, and Vgs>Vt of the first field effect transistor Q1 will turn on the first field effect transistor Q1. Then the path path1 of the current flow flows from the power source of the Vcc to the first field effect transistor Q1, the single-phase motor 100, the second field-counter diode ZD2, and the fourth field-effect transistor Q4 to the ground, and the path1 generates a current flow. Single phase motor.

When the first driving signal PWM1 is high, the second driving signal PWM2 is the first pulse width modulation signal, and when the first pulse width modulation signal is high, the seventh resistor R7 and the sixth resistor R6 are passed. The voltage is divided to generate a gate voltage such that Vgs of the second field effect transistor Q2 is >Vt. After the second field effect transistor Q2 is turned on, the gate of the first field effect transistor Q1 is connected to a low potential, so that the first field effect transistor Q1 is turned off, and the power supply of the Vcc is not caused to flow into the first stage. A potential transistor Q1, then path1 will not generate current through the single-phase motor.

Since the field effect transistor is used as the switch, the voltage drop of the field effect transistor is small, so that the operating voltage of the single-phase motor 100 becomes high, and the voltage of the single-phase motor 100 is high and the current is high. The torque of the single-phase motor 100 is proportional to the voltage and current, and when the voltage and current are high, the torque of the single-phase motor 100 is increased. For example, taking path1 as an example, the path through which the current passes is the first field effect transistor Q1, the single-phase motor 100, the second-signal diode ZD2, and the fourth field effect transistor Q4. Assuming that the power supply Vcc is 24V, the voltage drop of the first field effect transistor Q1 is 0.1V, the voltage drop of the second domain diode ZD2 is 0.7V, and the voltage drop of the fourth field effect transistor Q4 is 0.1V. The voltage drop across the single-phase motor 100 is 24 volts minus 0.9V (0.7V + 0.1V + 0.1V) and the resulting voltage is 23.1V. Comparing the prior art, please refer to Figure 1, 24 volts subtracts the path of two transistors, one transistor is 0.8V, two are 1.6V, so the obtained single-phase motor 100 has a voltage of 24 volts minus 1.6V. , get 22.4 volts. The voltage of the single-phase motor 100 obtained by the present invention is 0.7 V higher than that of the prior art, so that the torque of the single-phase motor can be increased by the present invention.

Next, please refer to FIG. 2E, which is a second path diagram of the first embodiment of the single-phase motor drive circuit of the present invention. At the same time, since the control of the motor also requires Pulse Width Modulation (PWM) control signal, the signal waveform measurement of the PWM, please refer to the 2D picture as the first implementation of the single-phase motor drive circuit of the present invention. Example of pulse width modulation Figure. When the second driving signal PWM2 is high, and the first driving signal PWM1 is the second pulse width modulation signal, the fourth field effect transistor Q4 controls the third field effect according to the second pulse width modulation signal. The transistor Q3 is turned off or on. At this time, the relationship between the first driving signal PWM1 and the gate measuring point TQ3 of the third field effect transistor Q3, please refer to FIG. 2D and FIG. 2E.

When the second driving signal PWM2 is high, the first driving signal PWM1 is the second pulse width modulation signal, and when the second pulse width modulation signal is low, the fourth field effect transistor Q4 is not turned on. . When the second driving signal PWM2 is at a high potential, a gate voltage is generated via the voltage division of the sixth resistor R6 and the seventh resistor R7, so that the second field effect transistor Q2 has Vgs>Vt, and the second field effect transistor After Q2 is turned on, the gate of the first field effect transistor Q1 is pulled to the low potential end. At this time, the first field effect transistor Q1 is not turned on, that is, no current flows through the first field effect transistor Q1. The second bootstrap circuit 80 is composed of a second diode D2, a second resistor R2, a second capacitor C2 and a second gate diode ZD2, and a current flows through the second diode D2 to the second capacitor. C2 is charged, and current flows through the second resistor R2 and the second senser diode ZD2 and flows to the second side of the motor. At this time, the second sigma diode ZD2 generates a bias voltage to the third field effect transistor Q3. At this time, the Vs of the third field effect transistor Q3>Vt will cause the third field effect transistor Q3 to be turned on. Then, the path 2 of the current flow flows from Vcc to the third field effect transistor Q3, the single-phase motor 100, the first gate diode ZD1, and the second field effect transistor Q2 to the ground, and path2 generates a current flow through the single Phase motor.

When the second driving signal PWM2 is at a high potential, the first driving signal PWM1 is a second pulse width modulation signal, and when the second pulse width modulation signal is high, the eighth resistor R8 and the ninth resistor R9 are The voltage division generates a gate voltage such that Vgs of the fourth field effect transistor Q4 is >Vt. After the fourth field effect transistor Q4 is turned on, the gate of the third field effect transistor Q3 will be made. When it is connected to the low potential, the third field effect transistor Q3 is turned off, and the Vcc power supply is not caused to flow into the third field effect transistor Q3, so that path2 does not generate current flowing through the single-phase motor.

When the first driving signal PWM1 is high and the second driving signal PWM2 is the first pulse width modulation signal, the single-phase motor 100 is subjected to forward bias current, so it will rotate. 180 degree. When the first driving signal PWM1 is the second pulse width modulation signal and the second driving signal PWM2 is high, the single-phase motor 100 is subjected to the reverse bias current, so it is switched from 180 degrees to 360 degrees. When the signal control of the first driving signal PWM1 and the second driving signal PWM2 is repeated, the single-phase motor 100 rotates in the forward direction. The invention can be used not only in an AC single-phase motor, but also in the forward and reverse rotation of a single-phase motor that controls DC.

Next, please refer to FIG. 3A, which is a block diagram of a second embodiment of the single-phase motor drive circuit of the present invention. Since the single-phase motor 100 drive circuit has some forward current to be grounded when the motor is commutated, The configuration of the first rectifier circuit 50 and the second rectifier circuit 90 can be increased. The circuit of FIG. 2A is added to the first rectifier circuit 50 and the second rectifier circuit 90, that is, FIG. 3A. The first end of the first rectifying circuit 50 is connected to the first side of the single-phase motor 100, and the second end of the first rectifying circuit 50 is connected to the ground end. The first end of the second rectifying circuit 90 is connected to the second side of the single-phase motor 100, and the second end of the second rectifying circuit 90 is connected to the ground end.

3B is a first schematic view of the second embodiment of the single-phase motor drive circuit of the present invention. The first rectifier circuit 50 is a third diode D3, and the first end of the third diode D3 is N-type and the second end is P-type. It is assumed that the current flowing current circuit has a first field effect transistor Q1, a single phase motor 100, a second field second diode ZD2 and a fourth field effect transistor Q4 to the ground end, when the single phase motor 100 is to be turned When the first effect transistor Q1 is to be turned off, the single phase motor is now 100 Due to the inductive load, it can be known from the law of cold law that when the single-phase motor is turned off, there will be a forward current. In this case, the third diode D3 is required to be the direction of the forward current to form a loop. Direct current to the ground to avoid instability in single-phase motors. Please refer to the tpath1 path of FIG. 3B. The flow direction of the forward current is the third diode D3, the single-phase motor 100, the second sigma diode ZD2 and the fourth field effect transistor Q4 are connected to the ground. When the forward current flows, the direction can be officially changed.

3C is a second schematic view of the second embodiment of the single-phase motor drive circuit of the present invention. The second rectifier circuit is a fourth diode D4, the first end of the fourth diode is N-type, and the second end of the fourth diode is P-type. It is assumed that the current passing current circuit has a second field effect transistor Q2, a single phase motor 100, a first sigma diode ZD1 and a second field effect transistor Q2 to the ground. When the single-phase motor 100 is to be switched again, when the third field effect transistor Q3 is to be turned off, the single-phase motor 100 will have a forward current still present, and the fourth diode D4 is required to be a forward current. Flow direction. Please refer to the tpath2 path of FIG. 3C. The flow direction of the forward current is the fourth diode D4, the single-phase motor 100, the first sigma diode ZD1 and the second field effect transistor Q2 are connected to the ground. When the forward current flows, the direction can be officially changed.

Next, please refer to FIG. 4, which is a circuit diagram of a third embodiment of the single-phase motor drive circuit of the present invention, and is an embodiment of the present invention using a dual power supply mechanism. When Vcc1 of the first driving circuit 20 and the third driving circuit 60 is 24V, Vcc2 of the first bootstrap circuit 40 and the second bootstrap circuit 80 may be 12V. The dual-supply mechanism allows single-phase motors to operate at high voltages.

The present invention provides a new H-Bridge circuit, and the new upper arm circuit of the H-Bridge circuit is composed of the first drive circuit 20 and the third drive circuit 60, and the lower arm circuit is composed of the second drive circuit 30. The invention is composed of the fourth driving circuit 70, and the invention solves the problem that the upper arm circuit and the lower arm circuit do not have simultaneous conduction. For example, the present invention solves the problem that the first driving circuit 20 and the second driving circuit 30 are not turned on at the same time. When the second driving circuit 30 is turned on, the first driving circuit 20 must be turned off, and when the second driving circuit 30 is turned off. The first driving circuit 20 must be turned on. Therefore, the first driving circuit 20 and the second driving circuit 30 are in a master-slave relationship, and the turning on or off of the first driving circuit 20 is determined by the second driving circuit 30. Similarly, the present invention also solves the problem that the third driving circuit 60 and the fourth driving circuit 70 are not simultaneously turned on. When the fourth driving circuit 70 is turned on, the third driving circuit 60 must be turned off, and the fourth driving circuit 70 is turned off. When the switch is off, the third drive circuit 60 must be turned on. Therefore, the third drive circuit 60 and the fourth drive circuit 70 are in a master-slave relationship, and the turn-on or turn-off of the third drive circuit 60 is determined by the fourth drive circuit 70. . Therefore, the circuit of the present invention does not have the first driving circuit 20 and the second driving circuit 30 or the third driving circuit 60 and the fourth driving circuit 70 are simultaneously turned on, thereby causing the occurrence of a short-circuit current to burn the transistor in the driving circuit.

Therefore, with the object of the present invention, low cost, increased torque, and the benefits of protecting the drive circuit can be achieved. In practical application, the present invention only needs to apply two control signals. In the past, the control circuit of the single-phase motor 100 needs to use four control signals, and the timing of the control is very precise to avoid the single-phase motor 100 driving. The circuit is burnt, and the present invention precisely controls the timing by the control of the driving circuit, and the single-phase motor 100 can be operated by simply controlling two signals.

Although the preferred embodiments of the present invention are disclosed above, it is not intended to limit the present invention, and those skilled in the art can make some changes without departing from the spirit and scope of the present invention. The scope of patent protection of the present invention is defined by the scope of the patent application attached to the specification.

Rt2‧‧‧second 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

Qt1‧‧‧First drive transistor

Qt2‧‧‧Second drive transistor

Qt3‧‧‧ Third drive transistor

Qt4‧‧‧fourth drive transistor

Qt5‧‧‧ fifth drive transistor

Qt6‧‧‧ sixth drive transistor

Dt1‧‧‧First Drive Diode

Dt2‧‧‧Second drive diode

10‧‧‧First switch circuit

12‧‧‧Second switch circuit

14‧‧‧ Third switch circuit

16‧‧‧fourth switch circuit

20‧‧‧First drive circuit

30‧‧‧Second drive circuit

40‧‧‧First bootstrap circuit

50‧‧‧First rectifier circuit

60‧‧‧ third drive circuit

70‧‧‧fourth drive circuit

80‧‧‧Second bootstrap circuit

90‧‧‧Second rectifier circuit

100‧‧‧ single phase motor

Q1‧‧‧The first effect transistor

Q2‧‧‧Second effect transistor

Q3‧‧‧The third effect transistor

Q4‧‧‧The fourth effect transistor

D1‧‧‧First Diode

R1‧‧‧first resistance

C1‧‧‧first capacitor

ZD1‧‧‧First Jenus diode

R6‧‧‧ sixth resistor

R7‧‧‧ seventh resistor

D2‧‧‧ second diode

R1‧‧‧second resistance

C2‧‧‧second capacitor

ZD2‧‧‧Second-Secondary

R8‧‧‧ eighth resistor

R9‧‧‧ ninth resistor

D3‧‧‧ third diode

D4‧‧‧ fourth diode

1A is a schematic diagram of a prior art single-phase motor drive circuit; FIG. 1B is a schematic diagram of a prior art single-phase motor drive signal; FIG. 1C is a schematic diagram of a prior art single-phase motor drive circuit path; FIG. 1D is a prior art FIG. 2A is a block diagram of a first embodiment of a single-phase motor drive circuit of the present invention; FIG. 2B is a circuit diagram of a first embodiment of a single-phase motor drive circuit of the present invention; 2C is a first path diagram of the first embodiment of the single-phase motor driving circuit of the present invention; FIG. 2D is a schematic diagram of pulse width modulation of the first embodiment of the single-phase motor driving circuit of the present invention; The second path diagram of the first embodiment of the single-phase motor drive circuit of the present invention; the third embodiment is a block diagram of the second embodiment of the single-phase motor drive circuit of the present invention; and FIG. 3B is a single phase of the present invention. A schematic diagram of a first path of a second embodiment of a motor drive circuit; a third path diagram of a second embodiment of the single-phase motor drive circuit of the present invention; and a fourth embodiment of the present invention A circuit diagram of a third embodiment of the drive circuit.

20‧‧‧First drive circuit

30‧‧‧Second drive circuit

40‧‧‧First bootstrap circuit

60‧‧‧ third drive circuit

70‧‧‧fourth drive circuit

80‧‧‧Second bootstrap circuit

100‧‧‧ single phase motor

Claims (11)

A single-phase motor driving device includes: a first driving circuit connected to a first power source and a first side of a single-phase motor; and a second driving circuit receiving a second driving signal and connected to the first a driving circuit and a ground end; a first bootstrap circuit connecting a second power source and the first driving circuit and the first side of the single-phase motor; when a first driving signal is high, the first self The first circuit is biased to the first driving circuit to turn on the first driving circuit; a third driving circuit is connected to the first power source and the second side of the single phase motor; a fourth driving circuit, Receiving a first driving signal and connecting to the third driving circuit and the ground; and a second bootstrap circuit connecting the second power source and the third driving circuit and the second side of the single-phase motor When the second driving signal is high, the second bootstrap circuit provides a second bias voltage to the third driving circuit to turn on the third driving circuit; wherein, when the first driving signal is high, and The second driving signal is a first pulse width When the signal is changed, the second driving circuit controls the first driving circuit to be turned off or turned on according to the first pulse width modulation signal, and when the first driving circuit is turned on, the current supplied by the first power source flows through the first a driving circuit, the single-phase motor, the second bootstrap circuit, and the fourth driving circuit to the ground end, so that the single-phase motor rotates; when the second driving signal is high, and the first driving signal is one When the second pulse width modulation signal is used, the fourth driving circuit controls the third driving circuit to be turned off or turned on according to the second pulse width modulation signal, and when the third driving circuit is turned on, the first power source provides Current flows through the third driving circuit, the single-phase motor, and the first self The circuit, the second driving circuit to the ground end, causes the single-phase motor to rotate. The single-phase motor driving device of claim 1, wherein the first bootstrap circuit comprises: a first diode, a first end of the first diode is connected to the second power source; and a first resistor a first end of the first resistor is connected to the second end of the first diode, and a second end of the first resistor is connected to the first driving circuit; a first second diode, the first a first end of the second diode is connected to the first driving circuit, a second end of the first semiconductor diode is connected to the first side of the single-phase motor; and a first capacitor, the first A first end of the capacitor is coupled to the first end of the first resistor, and a second end of the first capacitor is coupled to the first side of the single phase motor. The single-phase motor driving device of claim 1, wherein the second bootstrap circuit comprises: a second diode, the first end of the second diode is connected to the second power source; and the second resistor a first end of the second resistor is connected to the second end of the second diode, and a second end of the second resistor is connected to the third driving circuit; a second second diode, the second a first end of the second diode is connected to the third driving circuit, a second end of the second register diode is connected to the second side of the single-phase motor; and a second capacitor, the second A first end of the capacitor is coupled to the first end of the second resistor, and a second end of the second capacitor is coupled to the second side of the single phase motor. The single-phase motor driving device of claim 1, further comprising: a first rectifier circuit, the first end of the first rectifier circuit is connected to the first side of the single-phase motor, and the first rectifier circuit is The two ends are connected to the ground. The single-phase motor driving device of claim 1, further comprising: a second rectifier circuit, the first end of the second rectifier circuit being connected to the first phase of the single-phase motor On both sides, the second end of the second rectifier circuit is connected to the ground. The single-phase motor driving device of claim 1, wherein the first driving circuit is a first field effect transistor. The single-phase motor driving device of claim 1, wherein the third driving circuit is a third field effect transistor. The single-phase motor driving device of claim 1, wherein the second driving circuit comprises: a second field effect transistor, the first end of the second field effect transistor is connected to the first driving circuit, the second a third end of the field effect transistor is connected to the ground end; a seventh resistor, the first end of the seventh resistor receives the second driving signal, and the second end of the seventh resistor is connected to the second field effect transistor a second end; and a sixth resistor, the first end of the sixth resistor is connected to the second end of the second field effect transistor, and the second end of the sixth resistor is connected to the ground end. The single-phase motor driving device of claim 1, wherein the fourth driving circuit comprises: a fourth field effect transistor, the first end of the fourth field effect transistor is connected to the third driving circuit, the fourth The third end of the field effect transistor is connected to the ground end; an eighth resistor, the first end of the eighth resistor receives the first driving signal, and the second end of the eighth resistor is connected to the fourth field effect transistor a second end; and a ninth resistor, the first end of the ninth resistor is connected to the second end of the fourth field effect transistor, and the second end of the ninth resistor is connected to the ground end. The single-phase motor driving device of claim 1, wherein the voltages of the first power source and the second power source are the same power source. The single-phase motor driving device of claim 1, wherein the voltage of the first power source is greater than the first The voltage of the two power supplies.