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DESCRIPTION JPH08322099

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DESCRIPTION JPH08322099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic output circuit for driving a piezoelectric vibrator by a half wave voltage of an AC
power supply.
[0002]
2. Description of the Related Art In general, in an ultrasonic wave generator, the output of an
oscillation circuit using a direct current (a power supply obtained by rectifying and smoothing an
alternating current power supply) is boosted by a transformer and input to a piezoelectric
vibrator to transmit ultrasonic waves from the piezoelectric vibrator. It was configured to occur.
[0003]
However, in such an ultrasonic wave generator, the output transformer and the smoothing
capacitor are large and heavy, and the power supply voltage has to be changed to adjust the
output. .
[0004]
[Means for Solving the Problems] The present invention applies a half wave voltage outputted
from an AC power source through a rectifier to an ultrasonic oscillation circuit and a phase
detection circuit, and the ultrasonic wave is outputted from the phase detection circuit. The gate
transistor of the oscillation circuit is opened, the ultrasonic oscillation circuit is operated using a
part of the power of the half wave voltage, and ultrasonic vibration is output from the
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piezoelectric vibrator connected to the oscillation circuit.
[0005]
According to the present invention, the ultrasonic wave oscillation circuit is oscillated by opening
the gate transistor of the ultrasonic oscillation circuit with a part of the half-wave rectified power
supply of the commercial AC power supply, and supplied to the piezoelectric vibrator. Since an
output can be obtained and the range of supply voltages for operating the ultrasonic oscillation
circuit can be easily moved, it is easy to change the output.
[0006]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a block diagram of an
ultrasonic output circuit according to an embodiment of the present invention, wherein the
anode of a half wave rectifier 2 is connected to one terminal of an AC power supply 1 and the
cathode of this half wave rectifier 2 is connected. One terminal of the piezoelectric vibrator 4 is
connected via the resistor 3, and the other terminal of the AC power supply 1 is connected to the
other terminal of the piezoelectric vibrator 4 via the current detection circuit 7 consisting of a
parallel circuit of the resistor 5 and the capacitor 6. Is connected.
[0007]
The FET 8 is connected to the resistor 3 in parallel with the piezoelectric vibrator 4 and the
current detection circuit 7, the collector of the transistor 11 is connected to the cathode of the
half wave rectifier 2 via the resistors 9 and 10, and the emitter of the transistor 11 is AC The
other terminal of the power supply 1 is connected, the gate of the transistor 11 is connected to
the other terminal of the AC power supply 1 via the resistor 13, and the FET 8 and the transistor
11 constitute an output circuit 14 of the oscillation circuit.
[0008]
The capacitor 15 and one terminal of the resistor 16 and the collector of the transistor 17 are
connected to the resistor 9, the other terminal of the capacitor 15 is connected to the other
terminal of the AC power supply 1, and the other terminal of the resistor 16 is the gate of the
transistor 17 And the emitter of the transistor 17 is connected to the other terminal of the AC
power supply 1 through the capacitor 19 and the anode of the Zener diode 18 is also connected
to the other terminal of the AC power supply 1, The capacitors 15 and 19, the transistor 17, the
resistor 16 and the zener diode 18 constitute a power supply 20 of the oscillation circuit.
[0009]
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The gate of the gate transistor 22 is connected to the emitter of the transistor 17 via the resistor
21, the input side of the inverter 24 is connected to the collector of the gate transistor 22 via the
resistor 23, and the inverters 25 and 26 on the output side of the inverter 24 are in series. The
gate of the transistor 11 of the gate circuit 14 is connected to the output side of the inverter 26
via the resistor 27, and the resistors 28, 29 are connected in series to the emitter of the
transistor 17 of the power supply 20. The terminal of is connected to the AC power supply 1, the
input side of the inverter 30 is connected to the connection point of the resistors 28 and 29, and
the output side of the inverter 30 is connected to the input side of the inverter 24 via the
capacitor 31 and the resistor 32. , The output side of the inverter 26 is connected through the
resistor 33 and the variable The other terminal of the AC power supply 1 is connected to the
input side of the inverter 24 through the capacitor 35, and the input side of the inverter 30 is
connected to the connection point between the piezoelectric vibrator 4 and the current detection
circuit 7 through the capacitor 36. The oscillation circuit 37 is configured by the transistor 22,
the inverters 24, 25, 26, 30, and the like.
[0010]
Furthermore, the input side of the inverter 40 is connected to the cathode of the half wave
rectifier 2 via the resistor 38 and the variable resistor 39, the output side of the inverter 40 is
connected to the gate of the transistor 22 of the oscillation circuit 37 via the capacitor 41, The
input terminal of the inverter 40 is connected to the other terminal of the AC power supply 1
through a resistor 42 to constitute an input circuit 43.
[0011]
The operation of the ultrasonic output circuit according to this embodiment configured as
described above will be described. First, the voltage rectified by the half-wave rectifier 2 (E in FIG.
2) is supplied to the control circuit 43 and the oscillation circuit 37 through the resistor 9. In the
circuit 20, the smoothing capacitors 15 and 19 are connected as a DC power supply.
[0012]
Since the power of the oscillation circuit 37 and the control circuit 43 is sufficiently smaller than
the power required by the output circuit 14, the supply voltage of the output circuit 14 is a halfwave rectified voltage.
[0013]
The half-wave rectified voltage waveform (A in FIG. 2) is supplied to the control circuit 43
through the resistor 38, and the gate transistor 22 of the oscillator circuit 37 has a pulse width
(B in FIG. 2) determined by the differential multiplier of the resistor 21 and the capacitor 41.
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Turns off, the oscillation circuit 37 oscillates (C in FIG. 2), operates the output circuit 14 (D in
FIG. 2), and causes the piezoelectric vibrator 4 to output an ultrasonic wave.
[0014]
When the output circuit 14 is operated, as shown by D in FIG. 2, the oscillator circuit 37 of the
output E of the rectifier 2 oscillates for a time when the oscillation circuit 37 operates and
ultrasonic waves are output from the piezoelectric vibrator 4. It is simply applied as a DC voltage.
[0015]
As described above, in the circuit of this embodiment, the operating position of the half wave
power source can be changed by the resistor 39, and the operating time width can be changed by
the size of the resistor 21 (capacitor 41) of the input circuit 43.
[0016]
As apparent from the above description, in the ultrasonic output circuit of the present invention,
ultrasonic oscillation can be output by controlling the phase and time for opening the gate
transistor of the ultrasonic oscillation circuit, Further, by utilizing a part of the half wave voltage,
it is possible to control the ultrasonic wave output, there is an advantage that a smoothing
capacitor is not necessary in the power supply circuit, and the apparatus can be miniaturized.
[0017]
Brief description of the drawings
[0018]
1 is a block diagram of an ultrasonic output circuit according to an embodiment of the present
invention.
[0019]
2 is a voltage waveform of each part of the output circuit of FIG.
[0020]
Explanation of sign
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[0021]
Reference Signs List 1 power supply 7 current detection circuit 14 gate circuit 20 power supply
circuit 37 oscillation circuit 43 input circuit
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