JPH0728945Y2 - Ultrasonic transducer and motor drive circuit - Google Patents

Description

[Detailed description of the device]

[Industrial applications]

The present invention relates to an ultrasonic transducer and a motor drive circuit.

[Prior art]

For example, as a drive circuit for an ultrasonic transducer used in an ultrasonic cutter or the like, there is one shown in FIG. This is because the output of the oscillator circuit 12 is passed through the inverting amplifier circuit 13 to the transistor 14
The ultrasonic transducer 16 is driven by the back-induced voltage of the coil 15 and is switched to the ultrasonic transducer 16. On the other hand, as a drive circuit for a DC motor, there is, for example, one shown in FIG. This is configured such that a pulse having a constant cycle or a desired DC voltage is supplied to the base terminal of the transistor 18 for switching, and a current is passed through the motor drive coil 19 to drive a DC motor (not shown). .

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The conventional device described above is a dedicated drive circuit for driving either the ultrasonic transducer or the motor. Therefore, a person who uses both the ultrasonic transducer and the motor has to use the above-mentioned two types of dedicated drive circuits, which results in a large purchase cost and a large storage space. The present invention enables the ultrasonic transducer and the motor to be driven by a common circuit, prevents the transistor from being overloaded when the motor is driven, facilitates the detection of the resonance point, and enables the ultrasonic transducer to be efficiently driven. It was done.

[Means for Solving the Problems]

The present invention provides two sets of circuits each including a series circuit formed by connecting a diode and a coil in series, and a transistor connected in series to the series circuit and switched by a periodic drive pulse. , Two capacitors are connected in series between the connection terminals of the series circuit and the transistor, and a meter driving coil is connected between the connection terminal between the capacitors and one power supply terminal, and the series of each of the series is connected. The above problem is solved by using a connection terminal between the circuit and the transistor as a drive terminal of the ultrasonic oscillator, and using one of the drive terminals and the one power supply terminal as a drive terminal of the motor.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. First, the case of driving the ultrasonic transducer will be described.
In FIG. 1, 1 and 1'denotes transistors, 2 and 2'denotes diodes, 3 and 3'denotes coils, and the diode 2 and the coil 3 constitute a series circuit 4, and the diodes 2'and the coil 3'make series. The circuit 4'is constructed. Reference numeral 5 is an oscillation circuit that generates a periodic drive pulse, and 6
Is an inverting amplifier circuit, 7 is an ultrasonic transducer, 8 and 9 are capacitors having high withstand voltage, and 10 is a meter driving coil. As illustrated, the ultrasonic transducer 7 is connected between the drive terminals ab. The drive terminal a is derived from the connection point between the series circuit 4 and the transistor 1, and the drive terminal b is derived from the connection point between the series circuit 4'and the transistor 1 '. Next, the operation will be described. The drive pulse from the oscillation circuit 5 is supplied to the base terminal of the transistor 1 ′, its phase is inverted by the inverting amplifier circuit 6 and is supplied to the base terminal of the transistor 1. That is, drive pulses whose phases are opposite to each other are supplied to the base terminal of the transistor 1 and the base terminal of the transistor 1 '. Therefore, the transistor 1 and the transistor 1'are switched alternately. When the drive pulse from the oscillation circuit 5 is "0", the transistor 1 is turned on, a current flows in the coil 3, and the back electromotive force is generated by turning off the transistor 1, so that a voltage sufficiently higher than V _DD is ultrasonic vibration. It is applied to the child 7. When the drive pulse from the oscillation circuit 5 is "1", the transistor 1'is turned on, and a voltage sufficiently higher than V _DD is applied to the ultrasonic transducer 7 in the same manner as above. In this way, the ultrasonic transducer 7 is driven. Next, the case of driving the motor will be described. Second
In the figure, the same numbers as in FIG. 1 indicate the same items. 11 is a motor drive coil. As shown in the figure, the motor drive coil 11 is connected between the drive terminals ac. The motor drive coil 11 has a drive terminal bd
If it is connected between them, it will be the reverse rotation drive when it is connected between the above ac. Next, the operation will be described. The drive pulse from the oscillation circuit 5 has its phase inverted by the inverting amplifier circuit 6 and is supplied to the base terminal of the transistor 1. Therefore, when the drive pulse from the oscillation circuit 5 is "1", the transistor 1 is turned off,
A current flows through the motor drive coil 11 via the coil 3, and thereby a motor (not shown) is driven. With the above operation, either the ultrasonic transducer 7 or the motor can be driven. By the way, since a voltage is generated at the terminals a and b,
A current flows through the meter drive coil 10 to drive a meter (not shown), and the amount of the current can be known. When driving the motor, only one of the transistors 1 and 1'is used. So, for example,
When the motor drive coil 11 is connected as shown in the second illustration,
The transistor 1'side is overloaded. But,
Since the terminal b is grounded via the capacitor 9, it is possible to prevent an overload on the transistor 1'side. When the ultrasonic transducer 7 is driven, the amount of current between the terminals ab can be known by the meter, so the frequency of the signal from the oscillation circuit 5 is adjusted to detect the resonance point of the circuit. The ultrasonic vibrator 7 can be efficiently driven.

[Effect of device]

According to the present invention, since the ultrasonic transducer and the motor can be driven by a common circuit, it is not necessary for a person who uses both of them to purchase a dedicated drive circuit for each, which results in a significant purchase cost. It will be reduced and will not take up storage space. Further, by providing two capacitors connected in series between the drive terminals and a meter drive coil connected between the connection terminal of each of these capacitors and one power supply terminal, the overload on the transistor side that is not used during motor drive is provided. In addition, when the ultrasonic transducer is driven, the resonance point can be detected from the amount of current flowing through the meter driving coil, and the ultrasonic transducer can be efficiently driven.

[Brief description of drawings]

1 and 2 are electrical circuit diagrams showing an embodiment of the present invention, FIG. 3 is an electrical circuit diagram showing a conventional example of a dedicated drive circuit for an ultrasonic transducer, and FIG. 4 is a DC motor. It is an electric circuit diagram showing a conventional example of a dedicated drive circuit. 1,1 ′ …… Transistor 2,2 ′ …… Diode 3,3 ′ …… Coil 4,4 ′ …… Series circuit 7 …… Ultrasonic transducer 8,9 …… Capacitor 10 …… Meter drive coil 11 ...... Motor drive coils a, b …… Drive terminals

Claims (1)

[Scope of utility model registration request] 1. Two sets of circuits each comprising a series circuit formed by connecting a diode and a coil in series and a transistor connected in series to the series circuit and switched by a periodic drive pulse are provided. Two capacitors are connected in series between the connection terminals of the series circuit and the transistor in the circuit,
A coil for meter driving is connected between the connection terminal between each capacitor and one power supply terminal, and the connection terminal between the series circuit of each set and the transistor is used as the drive terminal of the ultrasonic vibrator. An ultrasonic transducer and a motor drive circuit, characterized in that either one and the one power supply terminal are drive terminals of a motor.