JP2018191798A - Power supply device and ultrasonic diagnostic device - Google Patents

Abstract

To transition an imaging mode to a shear wave mode in a short time without adversely affecting ultrasonic diagnosis.SOLUTION: In an ultrasonic diagnostic device, a power supply circuit 3 generates a power supply voltage HV1. A power supply unit 6 for a shear wave generates a power supply voltage HV2 different from the power supply voltage HV1 in a voltage level. A control circuit 1 controls an operation of the power supply circuit 3 and the power supply unit 6 for a shear wave. A power supply circuit 2 generates a power supply voltage HV2. A capacitor 4 is connected between an output part and reference potentials of the power supply circuit 2. A switch 5 is connected between an output part of the power supply circuit 2 and an output part of the power supply circuit 3, and a power supply part of a transmission circuit 7. When the transmission circuit 7 transitions from a B mode to a shear wave mode, the control circuit 1 transitions the power supply voltage HV1 to the same voltage level as the power supply voltage HV2, turns on the switch 5, and supplies the power supply voltage HV2 to the transmission circuit 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply apparatus and an ultrasonic diagnostic apparatus, and more particularly to power supply of an ultrasonic diagnostic apparatus that enables measurement of shear web elastography.

  In ultrasonic diagnostic apparatuses, share web elastography is becoming mainstream. Share web elastography measures the hardness of a tissue by generating a transverse wave (shear web: shear elastic wave) in the tissue and measuring the propagation speed of the wave.

  In order to generate a share web, it is necessary to irradiate a living body with a high-power transmission signal called a push pulse, and a power source capable of transmitting it, for example, a voltage V = ± 100 V, an output current Iout = 20 A, The transmission time t = 1 ms is required.

  Thus, the power supply circuit used for transmitting the push pulse is required to have a high voltage and a high output. Therefore, generally, a high-voltage and high-output power source is realized by accumulating electric charge in a large-capacity capacitor and supplying the electric charge from the capacitor to the transmission circuit during push pulse transmission.

  As a power supply circuit used in this type of ultrasonic diagnostic apparatus, for example, two systems of a power supply line to which a large-capacitance capacitor is connected and a power supply line to which a large-capacity capacitor is not connected are prepared, and these are switched by a switch. A device that improves the switching time by switching is known (see, for example, Patent Documents 1 and 2).

Japanese Patent Laying-Open No. 2015-58251 Japanese Patent Application Laid-Open No. 2006-73652

  However, when the transmission amplitude is changed by the power supply voltage, since a large-capacitance capacitor is connected, it takes time to switch the power supply voltage, and the operation mode is changed, for example, B mode (Brightness Mode ) To share web mode, it takes time.

  Further, in the techniques of Patent Documents 1 and 2, as described above, a switch for switching between two power supply lines is necessary. For example, when a switch, a large-capacitance capacitor, or the like is added as an option to the existing power supply circuit, the voltage supplied to the transmission circuit changes depending on the ON resistance of the switch.

  For this reason, there is a possibility that the power supplied to the living body changes in the shooting mode such as the B mode (Brightness Mode) or the share web mode.

  An object of the present invention is to provide a technique capable of shifting an imaging mode to a share web mode in a short time without adversely affecting the ultrasonic diagnosis.

  The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

  Of the inventions disclosed in the present application, the outline of typical ones will be briefly described as follows.

  That is, a typical ultrasonic diagnostic apparatus includes an ultrasonic transducer, a transmission circuit, and a power supply device. The ultrasonic transducer converts the transmission signal into an ultrasonic signal. The transmission circuit outputs a transmission signal to the ultrasonic transducer. The power supply device supplies a power supply voltage to the transmission circuit.

  The power supply device includes a first power supply unit, a second power supply unit, and a control unit. The first power supply unit supplies the transmission circuit when the transmission circuit operates in the second mode. The second power supply unit generates a second power supply voltage having a voltage level different from that of the first power supply voltage. The control unit controls operations of the first power supply unit and the second power supply unit.

  The second power supply unit includes a power supply generation circuit, a capacitor, and a switch. The power supply generation circuit generates a second power supply voltage. The capacitor is connected between the output part of the power generation circuit and the reference potential. One connection part of the switch is connected to the output part of the power generation circuit, and the other connection part is connected to the output part of the first power supply part and the power supply part of the transmission circuit.

  When the transmission circuit shifts from the first mode to the second mode, the control unit generates a first power supply voltage generated by the first power supply unit and a second power supply voltage generated by the second power supply unit. After the transition to the same voltage level, the switch is turned on to supply the second power supply voltage generated by the power generation circuit to the transmission circuit.

  In particular, the control unit includes a second power source that generates the first power source voltage generated by the first power source unit when the transmission circuit shifts from the first mode to the second mode. After making a transition to a voltage level higher than the voltage, the switch is turned on to supply the second power supply voltage generated by the power supply generation circuit to the transmission circuit.

  Among the inventions disclosed in the present application, effects obtained by typical ones will be briefly described as follows.

  (1) High voltage output can be switched in a short time.

  (2) Reliability can be improved.

3 is an explanatory diagram illustrating an example of a configuration of a power supply circuit according to Embodiment 1. FIG. It is explanatory drawing which shows an example of the timing chart in the power supply device of FIG. It is explanatory drawing which shows an example of a structure in the switch which the power supply part of FIG. 1 has. It is explanatory drawing which shows an example of a structure in the ultrasonic diagnosing device to which the power supply device of FIG. 1 is applied. FIG. 10 is an explanatory diagram illustrating an example of a configuration of a power supply device according to a second embodiment. It is explanatory drawing which shows an example of a structure in the switch which the power supply part for share webs of the power supply device of FIG. 5 has. 10 is an explanatory diagram illustrating an example of a timing chart in a power supply device according to Embodiment 3. FIG. FIG. 10 is an explanatory diagram illustrating an example of a configuration of a power supply device according to a fourth embodiment.

  In all the drawings for explaining the embodiments, the same members are denoted by the same reference symbols in principle, and the repeated explanation thereof is omitted. In order to make the drawings easy to understand, even a plan view may be hatched.

(Embodiment 1)
Hereinafter, embodiments will be described in detail.

<About ultrasonic diagnostic equipment>
An ultrasonic diagnostic apparatus is widely used as a medical diagnostic apparatus that can be observed non-invasively and in real time. Furthermore, in recent years, in addition to 2D images, 3D stereoscopic images and the like can be displayed, and uses are steadily expanding.

  On the other hand, the image quality is lower than that of an X-ray CT (Computed Tomography) apparatus or an MRI (Magnetic Resonance Imaging) apparatus. Therefore, higher image quality is required.

  Below, the example which applied the power supply circuit to the ultrasound diagnosing device is demonstrated.

<Configuration example of power supply circuit>
FIG. 1 is an explanatory diagram showing an example of the configuration of the power supply circuit according to the first embodiment.

  As shown in FIG. 1, the power supply device 10 includes a control circuit 1, a power supply circuit 3, and a share web power supply unit 6. The share web power supply unit 6 includes a power supply circuit 2, a capacitor 4, and a switch 5. The power supply circuit 3 is a first power supply unit, and the share web power supply unit 6 is a second power supply unit.

  The control circuit 1 serving as a control unit controls the power supply voltage generated by the power supply circuit 2 and the power supply circuit 3 by outputting the control signals CTL1 and CTL2. The power supply circuit 2 and the power supply circuit 3 generate and output power supply voltages set based on the control signals CTL1 and CTL2, respectively.

  One connection portion of the capacitor 4 and one connection portion of the switch 5 are connected to the output portion of the power supply circuit 2. The other connection portion of the capacitor 4 is connected to a reference potential.

  The other connection part of the switch 5 and the output part of the power supply circuit 3 are respectively connected to the power supply output part HVOUT of the power supply device 10. The power output unit HVOUT is connected to a plurality of transmission circuits 7 included in the ultrasonic diagnostic apparatus. The power supply voltage output from the power supply output unit HVOUT is supplied as an operating power supply for the transmission circuit 7.

  Here, the transmission circuit 7 is assumed to be a pulsar transmission circuit, for example, and the output signal level, that is, the output power is determined according to the voltage level of the operating power supply.

  The transmission circuit 7 is connected to each of the plurality of ultrasonic transducers 8, and is configured to transmit an ultrasonic signal according to the voltage transmitted from the transmission circuit 7, that is, the power supply voltage level.

  The power supply circuit 3 transmits an ultrasonic signal to a living body, and supplies a power supply voltage HV1, which is a first power supply voltage, to the transmission circuit 7 in a B mode (Brightness Mode) in which a distance and the magnitude of a reflected wave are displayed (brightness). Supply. This B mode is the first mode.

  In addition, the share web power supply unit 6 supplies the power supply voltage HV2 to the transmission circuit 7 in the share web mode, which is the second mode in which the hardness of the tissue is evaluated from the speed at which the shear wave propagates.

  In the share web mode, for example, a large current of about 100 V and 20 A needs to be supplied to the transmission circuit 7. Therefore, in the share web power supply unit 6, the switch 5 is turned on at the time of power supply, and the charge charged in the capacitor 4 from the power supply circuit 2 is supplied to the transmission circuit 7. The switch 5 is controlled to be turned on / off based on a switch control signal SWCTL output from the control circuit 1.

<Example of power supply operation>
FIG. 2 is an explanatory diagram showing an example of a timing chart in the power supply device of FIG.

  2, from the upper side to the lower side, the power supply voltage output from the power supply output unit HVOUT of the power supply device 10, the switch control signal SWCTL for controlling on / off of the switch 5, the power supply voltage HV2 generated by the power supply circuit 2, and Signal timings of the power supply voltage HV1, which is the first power supply voltage generated by the power supply circuit 3, are shown.

  In FIG. 2, the power supply voltage HV1 of the power supply circuit 3 is 50V and the power supply voltage HV2 of the power supply circuit 2 is 100V for the sake of explanation. Actually, the power supply voltages of the power supply circuit 2 and the power supply circuit 3 can be arbitrarily set by the control signals CTL1 and CTL2 output from the control circuit 1 as described above.

  First, in an imaging mode that does not require a large current, such as the B mode in an ultrasonic diagnostic apparatus, the switch 5 is turned off. Therefore, the power supply voltage HV1 of about 50 V generated by the power supply circuit 3 is supplied to the transmission circuit 7 from the power supply output unit HVOUT.

  During this time, the power supply circuit 2 generates and outputs a power supply voltage HV2 of about 100 V, which is a high voltage used in the share web mode, and charges the capacitor 4 with electric charges.

  As described above, since the switch 5 is off, the supply current from the power supply circuit 2 stops when the charging of the capacitor 4 is finished, and the capacitor 4 is charged to 100V.

When the ultrasonic diagnostic apparatus switches from the B mode to the share web mode at a certain time t1, the control circuit 1 outputs a control signal CTL2 to the power supply circuit 3 to generate a power supply voltage of 100V. As a result, the power supply voltage HV1 of the power supply circuit 3 becomes substantially the same potential as the power supply voltage HV2 of the power supply circuit 2. At this time, since the switch 5 is off, the power supply circuit 3 is in a state where the capacitor 4 is disconnected. Yes, it is possible to quickly transition to the same potential as the power supply circuit 2.

  When the power supply voltage HV2 of the power supply circuit 2 changes to the same potential as the power supply voltage HV1 of the power supply circuit 3, the switch 5 is turned on at time t2 '. Since the power supply voltage HV2 and the power supply voltage HV1 are at the same potential, power can be supplied to the transmission circuit 7 without an overcurrent flowing between the power supply circuit 2 and the power supply circuit 3. Thereby, switching from B mode to share web mode can be performed in a short time. Therefore, the convenience of the ultrasonic diagnostic apparatus can be improved.

  In the share web mode, since the push pulse is transmitted a plurality of times, the transmission period and the non-transmission period are repeated. A large current is supplied from the capacitor 4 to the transmission circuit 7 during the transmission period. During the non-transmission period, charges are accumulated in the capacitor 4 from the power supply circuit 3 and the power supply circuit 2.

  When the share web mode ends, the switch 5 is turned off at time t3 '. As a result, the capacitor 4 is disconnected from the power supply output unit HVOUT. Thereafter, at time t3, the control circuit 1 again changes the power supply voltage HV1 of the power supply circuit 3 to 50 V, and shifts to the operation of the B mode from time t4. At this time, only the power supply voltage HV1 generated by the power supply circuit 3 is supplied to the transmission circuit 7.

<Switch configuration example>
FIG. 3 is an explanatory diagram illustrating an example of a configuration of a switch included in the power supply unit illustrated in FIG.

  As shown in FIG. 3, the switch 5 includes a high voltage transistor 16, a diode 11, a transistor 12, and resistors 14 and 15. The high voltage transistor 16 is a transistor made of a P-channel MOS (Metal Oxide Semiconductor), and the high voltage transistor 16 includes an internal diode 13.

  The cathode of the internal diode 13 is connected to one end of the source / drain of the high voltage transistor 16. The anode of the internal diode 13 is connected to the other end of the source / drain of the high voltage transistor 16.

  The transistor 12 is an NPN type transistor, and the operation of the high voltage transistor 16 is controlled by the transistor 12 and the resistors 14 and 15. The diode 11 prevents reverse current.

  The source of the high voltage transistor 16 and one connection part of the resistor 14 are connected to the output part of the power supply circuit 2 in FIG. 1, and the drain of the high voltage transistor 16 is connected to the anode of the diode 11.

  The other connection portion of the resistor 14 and the collector of the transistor 12 are connected to the gate of the high voltage transistor 16. A switch control signal SWCTL output from the control circuit of FIG. 1 is input to the base of the transistor 12, and one connection portion of the resistor 15 is connected to the emitter of the transistor 12. Yes.

  A reference potential is connected to the other connection portion of the resistor 15, and a power supply output portion HVOUT of the power supply device is connected to the cathode of the diode 11.

Since the on / off of the high voltage transistor 16 is controlled by the gate-source voltage, no current flows through the resistors 14 and 15 when the base voltage of the transistor 12 is 0V. for that reason. The gate-source voltage is 0 V, and the high voltage transistor 16 is turned off. On the other hand, if the signal input to the base of the transistor 12, that is, the voltage of the switch control signal SWCTL is the voltage Vin, the transistor 12 has Isw = (Vin−0.7) / Rsw1 (Equation 1)
Current flows.

  Here, Isw is the collector-emitter current of the transistor 12, and Rsw1 is the resistance value of the resistor 14.

Therefore, the gate-source voltage VGSP of the high voltage transistor 16, that is, the voltage applied to the resistor 14 is VGSP = Rsw2 × Isw = Rsw2 × (Vin−0.7) / Rsw1 (Formula 2)
Thus, the gate-source voltage of the high-voltage transistor 16 can be controlled by the ratio of the resistor 14 and the resistor 15 to turn on / off.

  Here, Rsw2 is the resistance value of the resistor 14.

  The high voltage transistor 16 includes the internal diode 13 in structure as described above. Therefore, when the drain potential of the high-voltage transistor 16 becomes higher than the source potential, charge inflow occurs through the internal diode 13.

  In FIG. 1, the control circuit 1 controls the power supply circuits 3 and 2 so that the power supply voltage HV1 and the power supply voltage HV2 are the same potential. It may be higher than the power supply voltage HV2 of the circuit 2.

  In this case, when the high voltage transistor 16 is turned on in the share web mode, a current flows from the power supply circuit 3 to the power supply circuit 2 via the internal diode 13. The backflow current to the power supply circuit 2 is not desirable because it causes damage due to heat generation of internal elements.

  Therefore, the diode 11 is connected to the drain side of the high voltage transistor 16. Since the diode 11 allows a current to flow only from the anode to the cathode, it is possible to prevent a backflow current from the power supply circuit 3. Thereby, the reliability of a power supply device can be improved.

<Configuration example of ultrasonic diagnostic equipment>
FIG. 4 is an explanatory diagram showing an example of the configuration of an ultrasonic diagnostic apparatus to which the power supply apparatus of FIG. 1 is applied.

  As shown in FIG. 4, the ultrasonic diagnostic apparatus includes a power supply device 10, a transmission circuit 7, an ultrasonic transducer 8, a control unit 101, a display unit 103, a transmission / reception separating unit 104, a reception circuit 105, and an image processing unit 106. Have.

  The control unit 101 transmits a control signal for generating an ultrasonic signal to the transmission circuit 7. The transmission circuit 7 generates a transmission signal that drives the ultrasonic transducer 8 connected to the transmission circuit 7. The control unit 101 may have the function of the control circuit 1 included in the power supply device 10. In that case, the control circuit 1 of the power supply device 10 becomes unnecessary.

  The ultrasonic transducer 8 converts a transmission signal, which is an electrical signal, into an ultrasonic signal and irradiates the object. The ultrasonic signal reflected from the object is converted again into an electric signal by the ultrasonic transducer 8.

  The converted electrical signal is transmitted to the receiving circuit 105 and the image processing unit 106 via the transmission / reception separating unit 104 and an ultrasonic image is displayed on the display unit 103. Thus, the power supply device 10 is applied to a high-voltage power supply that supplies power to the transmission circuit 7.

  Thus, a push pulse requiring a large current can be transmitted without newly inserting a switch or the like in the power supply circuit 3. As a result, a high-current push pulse can be stably supplied in the share web mode while switching to the share web mode in a short time, so that the reliability of the ultrasonic diagnostic apparatus can be improved.

(Embodiment 2)
<Configuration example of power supply device>
In the second embodiment, a power supply device that transmits positive and negative push pulses to the transmission circuit 7 when shifting to the share web mode will be described.

  FIG. 5 is an explanatory diagram showing an example of the configuration of the power supply device according to the second embodiment.

  In this case, as shown in FIG. 5, the power supply device 10 includes a control circuit 1, power supply circuits 3a and 3b, and share web power supply units 6a and 6b. The power supply circuit 3a is a first power supply unit, and the share web power supply unit 6a is a second power supply unit. The power supply circuit 3b is a third power supply unit, and the share web power supply unit 6b is a fourth power supply unit.

  The share web power supply unit 6a includes a power supply circuit 2a, a capacitor 4a as a first capacitor, and a switch 5a. Similarly, the share web power supply unit 6b includes a power supply circuit 2b, a capacitor 4b, and a switch 5b. The power supply circuit 2a is a power supply voltage generation circuit for the second power supply section, and the power supply circuit 2b is a negative power supply voltage generation circuit for the fourth power supply section. The capacitor 4b is a negative power supply capacitor, and the switch 5b is a negative power switch.

  The connection configuration of the share web power supply units 6a and 6b is the same as that of the share web power supply unit 6 shown in FIG. The connection configuration between the share web power supply unit 6a and the power supply circuit 3a, and the share web power supply unit 6b and the power supply circuit 3b is the same as that of the share web power supply unit 6 and the power supply circuit 3 in FIG. Omitted.

  The difference is that the other connection part of the switch 5a which is the first switch and the output part of the power supply circuit 3a become the power output part HVOUT (+) of the power supply device 10, and the other connection of the switch 5b which is the second switch. And the output part of the power supply circuit 3 b become the power output part HVOUT (−) of the power supply device 10.

  Further, the power supply output unit HVOUT (+) and the power supply output unit HVOUT (−) are connected to the transmission circuit 7, respectively, and the power supply circuits 2a, 2b, 3a, and 3b receive control signals from the control circuit 1. Another difference is that CTL3, CTL4, CTL5, and CTL6 are connected so as to be output.

  The control circuit 1 controls the power supply voltages generated by the power supply circuits 2a, 3a, 2b, and 3b by the control signals CTL3, CTL4, CTL5, and CTL6, respectively. The power supply circuit 2a is a power supply circuit that generates a positive power supply voltage PHV2, and the power supply circuit 3a is a power supply circuit that generates a positive power supply voltage PHV1.

  The power supply circuit 2b is a power supply circuit that generates a negative power supply voltage MHV2, and the power supply circuit 3b is a power supply circuit that generates a negative power supply voltage MHV1. Therefore, the transmission circuit 7 connected to the power supply device 10 is supplied with the power supply voltages PHV1, PHV2, MHV1, and MHV2.

  The power supply voltage PHV1 is a first power supply voltage, and the power supply voltage PHV2 is a second power supply voltage. The power supply voltage MHV1 is a third power supply voltage, and the power supply voltage MHV2 is a fourth power supply voltage.

  The positive power supply voltage PHV1 is, for example, about + 50V, and the positive power supply voltage PHV2 is, for example, about + 100V. Further, the negative power supply voltage MHV1 is, for example, about -50V, and the negative power supply voltage MHV2 is, for example, about -100V.

<Example of power supply operation>
Subsequently, an operation at the time of shift to the share web by the power supply device 10 of FIG. 5 will be described.

  In the power supply device 10 of FIG. 5, the potential of the power supply circuit 3a is set to be substantially the same as that of the power supply circuit 2a and the potential of the power supply circuit 3b is set to be substantially the same potential of the power supply circuit 2b during the share web transition as in the first embodiment. To turn on the switches 5a and 5b. Thus, positive and negative push pulses requiring a large current can be transmitted without newly inserting a switch or the like in the power supply circuits 3a and 3b.

<Switch configuration example>
FIG. 6 is an explanatory diagram illustrating an example of a configuration of a switch included in the share web power supply unit of the power supply device of FIG. 5.

  FIG. 6 shows the configuration of the switch 5b included in the share web power supply unit 6b of the power supply device of FIG.

  As illustrated in FIG. 6, the switch 5 b includes a high voltage transistor 26, a diode 21, a transistor 22, and resistors 24 and 25. The high voltage transistor 16 is a transistor composed of an N channel MOS, and the high voltage transistor 26 includes an internal diode 23.

  The cathode of the internal diode 23 is connected to the drain of the high voltage transistor 26, and the source of the high voltage transistor 16 is connected to the anode of the internal diode 23.

  The transistor 22 is a PNP transistor, and the operation of the high voltage transistor 26 is controlled by the transistor 22 and the resistors 22 and 24. The diode 21 prevents reverse current in the same manner as the diode 11 of FIG.

  The on / off state of the high voltage transistor 26 is determined by a gate-source voltage (VGSN). When the base voltage (base potential) of the transistor 22 is a high signal (VDD), the gate-source voltage = 0, the transistor 22 When the base voltage (base potential) is a low signal (zero volts), Equation 3 shown below is obtained.

VGSN = Rsw2b × (VDD−0.7) / Rsw1b (Formula 3)
Here, Rsw2b is the resistance value of the resistor 24, and Rsw1b is the resistance value of the resistor 25.

  As described above, the gate-source voltage of the high-voltage transistor 26 can be controlled by the ratio of the resistor 24 and the resistor 25 to turn on / off. Note that the connection configuration of the switch 5a included in the share web power supply unit 6a is the same as that of the switch 5 shown in FIG.

  As described above, the power supply apparatus 10 that supports bipolar pulses in the share web mode can be provided by the configuration shown in FIG.

(Embodiment 3)
In the example shown in the first embodiment, when the power supply circuit 2 and the power supply circuit 3 are controlled to have the same potential at the time of transition from the B mode to the share web mode, the power supply circuit 2 and the power The output voltage with the circuit 3 does not always match.

  For example, when the power supply voltage HV1 of the power supply circuit 3 exceeds the power supply voltage HV2 of the power supply circuit 2, that is, when HV1> HV2, a reverse current from the power supply circuit 3 to the power supply circuit 2 is generated by the diode 11 of FIG. Can be prevented.

  On the other hand, when the power supply voltage HV1 is lower than the power supply voltage HV2, that is, when HV1 <HV2, the charge charged in the capacitor 4 flows back to the power supply circuit 3 when the switch 5 is turned on.

<Example of power supply operation>
In the third embodiment, a technique for preventing the backflow of the charge charged in the capacitor 4 will be described.

  FIG. 7 is an explanatory diagram showing an example of a timing chart in the power supply device according to the third embodiment. The configuration and connection of the power supply device 10 are the same as those in FIG. 1 of the first embodiment.

  In FIG. 7, from the upper side to the lower side, the power source voltage output from the power source output unit HVOUT of the power source device 10, the switch control signal SWCTL for controlling on / off of the switch 5, the power source voltage HV2 generated by the power source circuit 2, and Signal timings of the power supply voltage HV1 generated by the power supply circuit 3 are shown.

  In FIG. 7, when the mode is shifted from the B mode to the share web mode at time t1, the set voltage of the power supply voltage HV1 generated by the power supply circuit 3 is set to a voltage slightly higher than the power supply voltage HV2 of the power supply circuit 2. Here, the power supply voltage HV1 is set to 100 + αV for convenience, and α is set to about 5V, for example. This voltage is set based on a control signal CTL2 output from the control circuit 1.

  After the voltage has completely increased at time t2, the switch 5 is turned on at time t2 ′. When transmission of the push pulse is started at time t2 ″, the power is first supplied from the power supply circuit 2 and the voltage is instantaneously reduced to 100V.

  When the voltage drops below 100 V, the charge from the capacitor 4 is supplied via the high voltage transistor 16 and the diode 11 of the switch 5 shown in FIG. Therefore, the voltage drop becomes gentle.

  Subsequently, when the transmission of the push pulse is finished, the capacitor 4 is charged again by the power supply circuit 2, but is separated from the power supply circuit 3 by the diode 11 and rises to 100V.

  At this time, the power output unit HVOUT of the power supply device 10 rises again to a voltage of 100 + αV, and this is repeated a plurality of times.

  The reverse control from the power supply circuit 2 to the power supply circuit 3 can be prevented by the control described above. Thereby, the reliability of the power supply device 10 can be further improved.

  The technique for preventing the backflow of the electric charge charged in the capacitor is also effective in the power supply device shown in FIG. 5 of the second embodiment, and in the case of the power supply device in FIG. 5, the power supply circuit 3a generates it. The set voltage of the power supply voltage PHV1 is set to a voltage slightly higher than the power supply voltage HV2 of the power supply circuit 2a.

  Further, the set voltage of the power supply voltage MV1 generated by the power supply circuit 3b is set to a voltage slightly lower than the power supply voltage MV2 of the power supply circuit 2b. Thereby, the reverse current from the power supply circuit 2a to the power supply circuit 3a and the reverse current from the power supply circuit 2b to the power supply circuit 3b can be prevented, respectively.

(Embodiment 4)
In the fourth embodiment, a power supply device capable of physically separating or connecting the share web power supply unit 6 of FIG. 1 will be described. The connection configuration of the power supply device 10 is the same as that in FIG. 1 of the first embodiment.

<Configuration example of power supply circuit>
FIG. 8 is an explanatory diagram showing an example of the configuration of the power supply device according to the fourth embodiment.

  As described above, the power supply device 10 is the same as that in FIG. 1, and includes the control circuit 1, the power supply circuit 3, and the share web power supply unit 6. The share web power supply unit 6 includes a power supply circuit 2, a capacitor 4, and a switch 5.

  The main board 31 is made of, for example, a printed wiring board, and is included in the ultrasonic diagnostic apparatus. As shown in FIG. 8, a control circuit 1, a power supply circuit 3, a transmission circuit 7, and connectors 32 and 33 are mounted on the main body substrate 31, respectively.

  Similarly, the share web power supply unit 6 is mounted on the main surface of the share web board 30 made of a printed wiring board and the like, and connectors 32a and 33a are mounted on the back surface of the share web board 30, respectively. Yes. The main body substrate 31 is a first substrate, and the share web substrate 30 is a second substrate.

  In FIG. 8, the transmission circuit 7 is mounted on the main body substrate 31. However, the transmission circuit 7 may be provided on another substrate without being mounted on the main body substrate 31.

  The connector 32 of the main board 31 is connected to the connector 32 a of the share web board 30, and the connector 33 of the main board 31 is connected to the connector 33 a of the share web board 30.

  The connector 32 and the connector 32 a are connectors that electrically connect the control circuit 1 mounted on the main body substrate 31 and the power supply circuit 2 mounted on the share web substrate 30. The connector 33 and the connector 33 a are connectors connected to the power supply circuit 3 mounted on the main body substrate 31, the power supply circuit 2 mounted on the share web substrate 30, and the transmission circuit 7 mounted on the main body substrate 31.

  As described above, the main board 31 and the share web board 30 are electrically connected by the connector 32 and the connectors 32a, 33, and 33a, so that only when the share web power supply unit 6 is required, it can be easily performed. A share web substrate 30 can be attached.

  This is particularly effective for an ultrasonic diagnostic apparatus in which a share web mode can be added as an option, and the share web power supply unit 6 can be easily added in a short time.

  As described above, the share web mode can be validated easily and in a short time. Thereby, the ultrasonic diagnostic apparatus in which the share web mode is effective can be provided at low cost.

  8 shows an example in which the power supply device 10 having the configuration shown in FIG. 1 of the first embodiment is used. However, as shown in FIG. 5 of the second embodiment, the transmitter circuit 7 has a negative power supply voltage. And the power supply apparatus 10 that supplies the positive power supply voltage.

  In that case, the control circuit 1, the power supply circuits 3 a and 3 b, the transmission circuit 7, and the connectors 32 and 33 are mounted on the main body substrate 31, and the share web power supply units 6 a and 6 b and the connectors are mounted on the share web substrate 30. 32a and 33a are each mounted.

  Also by this, the share web power supply units 6a and 6b can be easily added in a short time.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and various modifications can be made without departing from the scope of the invention. Needless to say.

  In addition, this invention is not limited to above-described embodiment, Various modifications are included. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.

  Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. . In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 Control circuit 2 Power supply circuit 2a Power supply circuit 2b Power supply circuit 3 Power supply circuit 3a Power supply circuit 3b Power supply circuit 4 Capacitor 4a Capacitor 4b Capacitor 5 Switch 5a Switch 5b Switch 6 Share web power supply 6a Share web power supply 6b Share web power Unit 7 Transmission Circuit 8 Ultrasonic Vibrator 10 Power Supply Device 11 Diode 12 Transistor 13 Internal Diode 14 Resistor 15 Resistor 16 High Voltage Transistor 21 Diode 22 Transistor 23 Internal Diode 24 Resistor 25 Resistor 26 High Voltage Transistor 30 Share Web Substrate 31 Main Body Substrate 32 Connector 32a Connector 33 Connector 33a Connector 101 Control unit 103 Display unit 104 Transmission / reception separation unit 105 Reception circuit 106 Image processing unit

Claims (15)

A first power supply section that generates a first power supply voltage when operating in the first mode;
A second power supply unit that generates a second power supply voltage having a voltage level different from that of the first power supply voltage when operating in the second mode;
A control unit for controlling operations of the first power supply unit and the second power supply unit;
Have
The second power supply unit
A power supply generation circuit for generating the second power supply voltage;
A capacitor connected between an output part of the power generation circuit and a reference potential;
A switch having one connection connected to the output of the power generation circuit and the other connected to the output of the first power supply;
Have
When the control unit shifts from the first mode to the second mode, the second power source unit generates the first power source voltage generated by the first power source unit. The power supply device which outputs the second power supply voltage generated by the power supply generation circuit by turning on the switch after transitioning to the same voltage level as the power supply voltage of The power supply device according to claim 1, wherein
The switch includes a diode that prevents a reverse current flowing from the first power supply unit to the power supply generation circuit when the control unit turns on the switch. 2. The power supply device according to claim 1, wherein when the control unit shifts from the first mode to the second mode, the first power supply voltage generated by the first power supply unit is generated in the second mode. A power supply device that outputs the second power supply voltage generated by the power supply generation circuit by turning on the switch after making a transition to a voltage level higher than the second power supply voltage generated by the power supply unit. The power supply device according to claim 1, wherein
A first substrate on which the control unit and the first power supply unit are mounted;
A second substrate on which the second power supply unit is mounted;
Have
The power supply device, wherein the first substrate and the second substrate are electrically connected through a connector. The power supply device according to claim 1, wherein
A third power supply unit that generates a third power supply voltage that is a negative power supply voltage when operating in the first mode;
A fourth power supply unit that generates a fourth power supply voltage that is a negative power supply voltage when operating in the second mode and has a voltage level different from that of the third power supply voltage;
A negative power source control unit for controlling the operations of the third power source unit and the fourth power source unit;
Have
The fourth power supply unit
A negative power supply generation circuit for generating the fourth power supply voltage;
A negative power supply capacitor connected between the output part of the negative power supply generation circuit and a reference potential;
A negative power supply switch having one connection portion connected to the output portion of the negative power supply generation circuit and the other connection portion connected to the output portion of the third power supply portion;
Have
The fourth power supply unit generates the third power supply voltage generated by the third power supply unit when the negative power supply control unit shifts from the first mode to the second mode. A power supply device that outputs the fourth power supply voltage generated by the fourth power supply generation circuit by turning on the negative power supply switch after making a transition to the same voltage level as the fourth power supply voltage. An ultrasonic diagnostic apparatus comprising: an ultrasonic transducer that converts a transmission signal into an ultrasonic signal; a transmission circuit that outputs the transmission signal to the ultrasonic transducer; and a power supply device that supplies a power supply voltage to the transmission circuit. Because
The power supply device
A first power supply unit that generates a first power supply voltage to be supplied to the transmission circuit when the transmission circuit operates in the first mode;
A second power supply unit that generates a second power supply voltage having a voltage level different from the first power supply voltage supplied to the transmission circuit when the transmission circuit operates in the second mode;
A control unit for controlling operations of the first power supply unit and the second power supply unit;
Have
The second power supply unit
A power supply generation circuit for generating the second power supply voltage;
A capacitor connected between an output part of the power generation circuit and a reference potential;
A switch having one connection connected to the output of the power supply generation circuit and the other connection connected to the output of the first power supply and the power supply of the transmission circuit;
Have
The control unit generates the first power supply voltage generated by the first power supply unit when the transmission circuit shifts from the first mode to the second mode. The ultrasonic diagnostic apparatus, wherein the second power supply voltage generated by the power supply generation circuit is supplied to the transmission circuit by turning on the switch after transitioning to the same voltage level as the second power supply voltage. The ultrasonic diagnostic apparatus according to claim 6,
The ultrasonic diagnostic apparatus, wherein the switch includes a diode that prevents a reverse current flowing from the first power supply unit to the power supply generation circuit when the control unit turns on the switch. The ultrasonic diagnostic apparatus according to claim 6, wherein the control unit generates the first power source generated by the first power source unit when the transmission circuit shifts from the first mode to the second mode. The transmission circuit supplies the second power supply voltage generated by the power supply generation circuit by turning on the switch after transitioning the voltage to a voltage level higher than the second power supply voltage generated by the second power supply unit. Ultrasonic diagnostic equipment to supply to. The ultrasonic diagnostic apparatus according to claim 6,
A first substrate on which the control unit and the first power supply unit are mounted;
A second substrate on which the second power supply unit is mounted;
Have
The ultrasonic diagnostic apparatus, wherein the first substrate and the second substrate are electrically connected through a connector. The ultrasonic diagnostic apparatus according to claim 6,
The ultrasonic diagnostic apparatus in which the second mode is a share web mode in which tissue hardness is evaluated from the speed at which shear waves propagate. An ultrasonic diagnostic apparatus comprising: an ultrasonic transducer that converts a transmission signal into an ultrasonic signal; a transmission circuit that outputs the transmission signal to the ultrasonic transducer; and a power supply device that supplies a power supply voltage to the transmission circuit. Because
The power supply device
A first power supply unit that generates a first power supply voltage that is a positive power supply voltage supplied to the transmission circuit when the transmission circuit operates in the first mode;
A second power supply unit that generates a second power supply voltage having a voltage level different from the positive first power supply voltage supplied to the transmission circuit when the transmission circuit operates in the second mode;
A third power supply unit that generates a third power supply voltage that is a negative power supply voltage supplied to the transmission circuit when the transmission circuit operates in the first mode;
A negative power supply voltage supplied to the transmission circuit when the transmission circuit operates in the second mode, and generates a fourth power supply voltage having a voltage level different from the third power supply voltage. A power supply,
A control unit for controlling the operations of the first power supply unit, the second power supply unit, the third power supply unit, and the fourth power supply unit;
Have
The second power supply unit
A power supply generation circuit for generating the second power supply voltage;
A capacitor connected between an output part of the power generation circuit and a reference potential;
A switch having one connection connected to the output of the power supply generation circuit and the other connection connected to the output of the first power supply and the power supply of the transmission circuit;
Have
The fourth power supply unit
A negative power supply generation circuit for generating the fourth power supply voltage;
A negative power supply capacitor connected between the output part of the negative power supply generation circuit and a reference potential;
A negative power supply switch having one connection connected to the output of the negative power supply generation circuit and the other connection connected to the output of the third power supply and the power supply of the transmission circuit;
Have
The control unit generates the first power supply voltage generated by the first power supply unit when the transmission circuit shifts from the first mode to the second mode. The third power supply voltage generated by the third power supply unit is set to the same voltage level as the fourth power supply voltage generated by the fourth power supply unit. After the transition, the switch and the negative power supply switch are turned on, and the second power supply voltage generated by the power supply generation circuit and the fourth power supply voltage generated by the negative power supply generation circuit are supplied to the transmission circuit. Supply ultrasonic diagnostic equipment. The ultrasonic diagnostic apparatus according to claim 11,
The switch includes a diode that prevents a reverse current flowing from the first power supply unit to the power supply generation circuit when the control unit turns on the switch;
The negative power supply switch includes a negative power supply diode that prevents a reverse current flowing from the third power supply unit to the negative power supply generation circuit when the control unit turns on the negative power supply switch. apparatus. The ultrasonic diagnostic apparatus according to claim 11, wherein the control unit generates the first power source generated by the first power source unit when the transmission circuit shifts from the first mode to the second mode. The switch is turned on after the voltage is shifted to a voltage level higher than the second power supply voltage generated by the second power supply unit, and the third power supply voltage generated by the third power supply unit is changed to the third power supply voltage. The negative power supply switch is turned on after transitioning to a voltage level lower than the fourth power supply voltage generated by the fourth power supply unit, and the second power supply voltage and the negative power supply generated by the power supply generation circuit are turned on. An ultrasonic diagnostic apparatus that supplies the fourth power supply voltage generated by a power supply generation circuit to the transmission circuit. The ultrasonic diagnostic apparatus according to claim 11,
A first substrate on which the control unit, the first power supply unit, and the second power supply unit are mounted;
A second substrate on which the third power supply unit and the fourth power supply unit are mounted;
Have
The ultrasonic diagnostic apparatus, wherein the first substrate and the second substrate are electrically connected through a connector. The ultrasonic diagnostic apparatus according to claim 11,
The ultrasonic diagnostic apparatus in which the second mode is a share web mode in which tissue hardness is evaluated from the speed at which shear waves propagate.

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