A power supply discharge circuit and ultrasonic equipment

Abstract

The present invention discloses a power supply discharge circuit, which is applied to an ultrasonic device provided with a transmitting circuit, including: a DC-DC conversion circuit whose input end is connected to a DC power supply; a power supply circuit whose positive input end and negative input end are respectively connected one-to-one to the positive output end and negative output end of the DC-DC conversion circuit, and whose positive output end and negative output end are respectively connected one-to-one to the positive input end and negative input end of the power supply of the transmitting circuit; a discharge circuit connected to the power supply circuit and a controller connected to the discharge circuit; the present invention uses the discharge circuit to discharge the input voltage and / or output voltage of the power supply circuit between the DC-DC conversion circuit and the transmitting circuit through the setting of the discharge circuit, so that when the input voltage of the transmitting circuit is lowered, the voltage regulation speed can be increased to meet the requirement of fast regulation and improve the user experience. In addition, the present invention also discloses an ultrasonic device, which also has the above-mentioned beneficial effects.

Description

Technical Field

[0001] The present invention relates to the field of ultrasonic technology, and in particular to a power supply and discharge circuit and ultrasonic equipment. Background Art

[0002] Ultrasonic equipment (i.e., ultrasonic diagnostic equipment) uses ultrasonic echo imaging technology to detect human diseases by transmitting ultrasonic signals to the human body and receiving ultrasonic echo signals. When the ultrasonic equipment works in shear wave transmission mode, it involves simultaneous transmission of multiple channels, which may reach 96 channels, 128 channels or more channels at the same time. The required instantaneous current is relatively large, reaching 100A, 150A or more in many cases, and the transmission voltage is as high as 90V.

[0003] Currently, if Figure 1 As shown, the ultrasonic device uses a DC-DC conversion circuit to directly supply power to the pulse generator (PLUSER) of the transmitting circuit. When the ultrasonic device works in certain working modes (such as shear wave transmission mode), the output voltage of the DC-DC conversion circuit is very high; at this time, if the input voltage required by the transmitting circuit becomes low, the traditional solution is to rely on the DC-DC conversion circuit and the transmitting circuit self-discharge to adjust the voltage of the capacitor between the DC-DC conversion circuit and the transmitting circuit to the target value, which makes the voltage down-regulation speed very slow and difficult to meet the requirements of fast regulation. Therefore, how to improve the down-regulation speed of the power supply voltage of the transmitting circuit, meet the requirements of fast regulation, and improve user experience is a problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to provide a power supply discharge circuit and an ultrasonic device to increase the downward adjustment speed of the power supply voltage of the transmitting circuit, meet the requirements of rapid adjustment, and improve the user experience.

[0005] In order to solve the above technical problems, the present invention provides a power supply and discharge circuit, which is applied to an ultrasonic device provided with a transmitting circuit, comprising:

[0006] A DC-DC conversion circuit having an input end connected to a DC power supply;

[0007] A power supply circuit having a positive input terminal and a negative input terminal connected one-to-one with a positive output terminal and a negative output terminal of the DC-DC conversion circuit respectively, and a positive output terminal and a negative output terminal connected one-to-one with a positive input terminal and a negative input terminal of a power supply of the transmitting circuit respectively;

[0008] A discharge circuit connected to the power supply circuit and a controller connected to the discharge circuit; wherein the controller is used to control the discharge circuit to discharge the input voltage and / or output voltage of the power supply circuit.

[0009] Optionally, when the power supply circuit is specifically a linear voltage stabilization circuit, the first discharge input terminal of the discharge circuit is connected to the positive input terminal of the power supply circuit, the second discharge input terminal of the discharge circuit is connected to the negative input terminal of the power supply circuit, the third discharge input terminal of the discharge circuit is connected to the positive output terminal of the power supply circuit, and the fourth discharge input terminal of the discharge circuit is connected to the negative output terminal of the power supply circuit; the discharge circuit is used to discharge the input voltage and output voltage of the power supply circuit according to the control of the controller.

[0010] Optionally, the discharge circuit includes: a first discharge circuit and a second discharge circuit;

[0011] Wherein, the first discharge input terminal of the first discharge circuit is connected to the positive input terminal of the power supply circuit as the first discharge input terminal of the discharge circuit, and the second discharge input terminal of the first discharge circuit is connected to the negative input terminal of the power supply circuit as the second discharge input terminal of the discharge circuit; the control input terminal of the first discharge circuit is connected to the controller, and is used to discharge the input voltages of the positive input terminal of the power supply circuit and the negative input terminal of the power supply circuit when the first target signal output by the controller is detected;

[0012] The first discharge input terminal of the second discharge circuit is connected to the positive output terminal of the power supply circuit as the third discharge input terminal of the discharge circuit, and the second discharge input terminal of the second discharge circuit is connected to the negative output terminal of the power supply circuit as the fourth discharge input terminal of the discharge circuit; the control input terminal of the second discharge circuit is connected to the controller, and is used to discharge the output voltage of the positive output terminal of the power supply circuit and the negative output terminal of the power supply circuit when a second target signal output by the controller is detected.

[0013] Optionally, the first discharge circuit includes: a target signal detection circuit, a first control discharge circuit and a second control discharge circuit; wherein,

[0014] The input end of the first controlled discharge circuit is connected to the positive input end of the power supply circuit as the first discharge input end of the first discharge circuit, the output end of the first controlled discharge circuit is grounded, and the first controlled discharge circuit includes a first controllable switch;

[0015] The input end of the second controlled discharge circuit is connected to the negative input end of the power supply circuit as the second discharge input end of the first discharge circuit, the output end of the second controlled discharge circuit is grounded, and the second controlled discharge circuit includes a second controllable switch;

[0016] The input end of the target signal detection circuit is connected to the controller as the control input end of the first discharge circuit, and is used to control the first controllable switch and the second controllable switch to be turned on when the first target signal is detected, so as to discharge the input voltage of the positive input end and the negative input end of the power supply circuit.

[0017] Optionally, the first controllable switch is specifically an NMOS tube, the second controllable switch is specifically a PMOS tube, and when the first target signal is a high-level signal, the target signal detection circuit includes: a first operational amplifier, a second operational amplifier, a first NPN transistor, a second NPN transistor, a first PNP transistor, a second PNP transistor, a first resistor, and a second resistor;

[0018] The common end of the non-inverting input end of the first operational amplifier and the inverting input end of the second operational amplifier are connected to the controller as the input end of the target signal detection circuit, the inverting input end of the first operational amplifier is connected to the non-inverting input end of the second operational amplifier, the inverting input end of the first operational amplifier is respectively connected to the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is connected to the preset positive power supply end, and the second end of the second resistor is grounded; the output end of the first operational amplifier is respectively connected to the base of the first NPN transistor and the base of the first PNP transistor, the collector of the first NPN transistor is connected to the positive power supply end, and the collector of the first NPN transistor is connected to the positive power supply end. The preset positive power supply terminal is connected, the emitter of the first NPN transistor is connected to the emitter of the first PNP transistor, their common end is connected to the gate of the first controllable switch, and the collector of the first PNP transistor is connected to the preset negative power supply terminal; the output end of the second operational amplifier is respectively connected to the base of the second NPN transistor and the base of the second PNP transistor, the collector of the second NPN transistor is connected to the preset positive power supply terminal, the emitter of the second NPN transistor is connected to the emitter of the second PNP transistor, their common end is connected to the gate of the second controllable switch, and the collector of the second PNP transistor is connected to the preset negative power supply terminal.

[0019] Optionally, the power supply discharge circuit also includes: a first energy storage capacitor, a second energy storage capacitor, a third energy storage capacitor and a fourth energy storage capacitor; wherein, the first end of the first energy storage capacitor is connected to the positive output end of the DC-DC conversion circuit, the first end of the second energy storage capacitor is connected to the negative output end of the DC-DC conversion circuit, the first end of the third energy storage capacitor is connected to the positive output end of the power supply circuit, the first end of the fourth energy storage capacitor is connected to the negative output end of the power supply circuit, and the second ends of the first energy storage capacitor, the second energy storage capacitor, the third energy storage capacitor and the fourth energy storage capacitor are all grounded.

[0020] Optionally, the discharge circuit includes: a first discharge circuit and a second discharge circuit; wherein, when the power supply circuit is specifically a linear voltage stabilization circuit, the power supply circuit includes:

[0021] A positive linear voltage stabilizing circuit having an input end connected to the positive output end of the DC-DC conversion circuit and an output end connected to the positive input end of the power supply of the transmitting circuit;

[0022] A negative linear voltage stabilizing circuit having an input end connected to the negative output end of the DC-DC conversion circuit and an output end connected to the negative input end of the power supply of the transmitting circuit;

[0023] Wherein, the controller is connected to the DC-DC conversion circuit, the positive linear voltage regulator circuit and the negative linear voltage regulator circuit respectively, and is used to control the input and output voltage difference of the positive linear voltage regulator circuit and the negative linear voltage regulator circuit by adjusting the output voltage of the DC-DC conversion circuit, the positive linear voltage regulator circuit and the negative linear voltage regulator circuit.

[0024] Optionally, the positive linear voltage regulator circuit includes: a first digital-to-analog converter, a first floating voltage regulation circuit, a first voltage regulator circuit provided with a first low voltage drop linear regulator, a first current detection circuit and a first power circuit;

[0025] Wherein, the input end of the first digital-to-analog converter is connected to the first control end of the controller, and is used to convert the digital signal output by the first control end into a corresponding voltage value;

[0026] The input end of the first floating voltage regulating circuit is connected to the output end of the first digital-to-analog converter, and is used to convert the voltage value output by the first digital-to-analog converter into a first floating voltage;

[0027] The positive output terminal of the DC-DC conversion circuit is connected to the positive input terminal of the power supply of the transmitting circuit through the first current detection circuit and the first voltage regulator circuit in sequence; the floating voltage output terminal of the first floating voltage regulation circuit is connected to the reference terminal of the first low voltage difference linear regulator; the first current detection circuit is used to drive and control the first power circuit to turn on when it is detected that the current output by the positive output terminal of the DC-DC conversion circuit is greater than the first current threshold;

[0028] The input end and the output end of the first power circuit are respectively connected to the positive output end of the DC-DC conversion circuit and the positive input end of the power supply of the transmitting circuit, and the control input end of the first power circuit is connected to the control output end of the first current detection circuit, and is used to conduct the connection between the positive output end of the DC-DC conversion circuit and the positive input end of the power supply of the transmitting circuit according to the control of the first current detection circuit to provide a load current.

[0029] Optionally, the negative linear voltage regulator circuit includes: a second digital-to-analog converter, a second floating voltage regulation circuit, a second voltage regulator circuit provided with a second low voltage drop linear regulator, a second current detection circuit and a second power circuit;

[0030] Wherein, the input end of the second digital-to-analog converter is connected to the second control end of the controller, and is used to convert the digital signal output by the second control end into a corresponding voltage value;

[0031] The input end of the second floating voltage regulating circuit is connected to the output end of the second digital-to-analog converter, and is used to convert the voltage value output by the second digital-to-analog converter into the output voltage of the negative linear voltage stabilizing circuit and the second floating voltage;

[0032] The negative output terminal of the DC-DC conversion circuit is connected to the negative input terminal of the power supply of the transmitting circuit through the second voltage regulator circuit and the second current detection circuit in sequence; the floating voltage output terminal of the second floating voltage regulation circuit is connected to the reference terminal of the second low voltage difference linear regulator; the second current detection circuit is used to drive and control the second power circuit to turn on when detecting that the current at the output terminal of the second low voltage difference linear regulator is greater than the second current threshold;

[0033] The input and output ends of the second power circuit are respectively connected to the negative output end of the DC-DC conversion circuit and the negative input end of the power supply of the transmitting circuit, and the control input end of the second power circuit is connected to the control output end of the second current detection circuit.

[0034] In addition, the present invention also provides an ultrasonic device, including a transmitting circuit and the power supply and discharge circuit as described above.

[0035] A power supply discharge circuit provided by the present invention is applied to an ultrasonic device provided with a transmitting circuit, comprising: a DC-DC conversion circuit whose input end is connected to a DC power supply; a power supply circuit whose positive input end and negative input end are respectively connected one-to-one to a positive output end and a negative output end of the DC-DC conversion circuit, and whose positive output end and negative output end are respectively connected one-to-one to a positive input end and a negative input end of a power supply of the transmitting circuit; a discharge circuit connected to the power supply circuit and a controller connected to the discharge circuit; wherein the controller is used to control the discharge circuit to discharge the input voltage and / or output voltage of the power supply circuit;

[0036] It can be seen that the present invention uses the discharge circuit to discharge the input voltage and / or output voltage of the power supply circuit between the DC-DC conversion circuit and the transmitting circuit, thereby increasing the voltage regulation speed when lowering the input voltage of the transmitting circuit to meet the requirement of fast regulation and improve the user experience. In addition, the present invention also provides an ultrasonic device, which also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0038] Figure 1 It is a schematic diagram of the power supply structure of the transmitting circuit of the ultrasonic equipment in the prior art;

[0039] Figure 2 A schematic diagram of the structure of a power supply and discharge circuit provided by an embodiment of the present invention;

[0040] Figure 3 A schematic diagram of the structure of another power supply and discharge circuit provided by an embodiment of the present invention;

[0041] Figure 4 A circuit diagram of a discharge circuit of another power supply discharge circuit provided by an embodiment of the present invention;

[0042] Figure 5 A schematic structural diagram of another positive linear voltage stabilizing circuit of a power supply and discharge circuit provided by an embodiment of the present invention;

[0043] Figure 6 A circuit diagram of another positive linear voltage stabilizing circuit of a power supply and discharge circuit provided by an embodiment of the present invention;

[0044] Figure 7 A schematic structural diagram of another negative linear voltage stabilizing circuit of a power supply and discharge circuit provided by an embodiment of the present invention;

[0045] Figure 8 A circuit diagram of another negative linear voltage stabilizing circuit of a power supply and discharge circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Please refer to Figure 2 , Figure 2 This is a schematic diagram of a power supply and discharge circuit provided by an embodiment of the present invention. The circuit is applied to an ultrasonic device provided with a transmitting circuit, and may include:

[0048] A DC-DC conversion circuit 10 having an input end connected to a DC power supply;

[0049] A power supply circuit 20 in which the positive input terminal and the negative input terminal are connected one-to-one with the positive output terminal and the negative output terminal of the DC-DC conversion circuit 10 respectively, and the positive output terminal and the negative output terminal are connected one-to-one with the positive input terminal and the negative input terminal of the power supply of the transmitting circuit respectively;

[0050] A discharge circuit 30 connected to the power supply circuit 20 and a controller 40 connected to the discharge circuit 30 ; wherein the controller 40 is used to control the discharge circuit 30 to discharge the input voltage and / or output voltage of the power supply circuit 20 .

[0051] It can be understood that the DC-DC conversion circuit 10 in the power supply discharge circuit 30 in this embodiment can be used to convert the DC voltage output by the DC power supply to output a corresponding DC voltage. The DC voltage output by the DC-DC conversion circuit 10 includes a positive DC voltage and a negative DC voltage. The positive DC voltage is input to the positive input terminal of the power supply circuit 20, and the negative DC voltage is input to the negative input terminal of the power supply circuit 20, so as to power the transmitting circuit through the power supply circuit 20.

[0052] Correspondingly, the DC-DC conversion circuit 10 in this embodiment can be connected to the controller 40, and is used to convert the DC voltage output by the DC power supply according to the control of the controller 40, and output the corresponding DC voltage. In other words, the controller 40 can also be used to control and adjust the output voltage of the DC-DC conversion circuit 10. The specific circuit structure of the DC-DC conversion circuit 10 in this embodiment can be set by the designer according to practical scenarios and user needs. For example, it can be implemented in the same or similar manner as the DC-DC conversion circuit 10 in the ultrasound equipment in the prior art, and this embodiment does not impose any restrictions on this.

[0053] Specifically, the power supply circuit 20 in this embodiment may be a circuit between the DC-DC conversion circuit 10 and the transmitting circuit for supplying power to the transmitting circuit using the direct current output by the DC-DC conversion circuit 10. The type of the power supply circuit 20 in this embodiment may be set by the designer. For example, the power supply circuit 20 may be a storage circuit in the prior art, for example Figure 1 The circuit is composed of an energy storage capacitor between the DC-DC conversion circuit 10 and the transmitting circuit to play an energy storage role; the power supply circuit 20 can also be a voltage stabilizing circuit such as a linear voltage stabilizing circuit to use the direct current output by the DC-DC conversion circuit 10 to provide a stable direct current for the transmitting circuit; further, the power supply circuit 20 can adopt a linear voltage stabilizing circuit to use the voltage difference between the front and rear ends of the linear voltage stabilizing circuit to play an energy storage role, solve the voltage drop problem of the ultrasonic equipment in the shear wave transmission mode, reduce the use of energy storage capacitors, and use the fast response of linear voltage stabilization to timely adjust the stability of the linear voltage stabilization output voltage. As long as the power supply circuit 20 can use the direct current output by the DC-DC conversion circuit 10 to provide the transmitting circuit with a power supply voltage that meets the power supply requirements of the transmitting circuit, this embodiment does not impose any restrictions on this.

[0054] It can be understood that the discharge circuit 30 in this embodiment can discharge the input voltage and / or output voltage of the power supply circuit 20 according to the control of the controller 40 . The specific discharge mode of the discharge circuit 30, that is, the connection relationship between the discharge circuit 30 and the power supply circuit 20, can be set by the designer according to practical scenarios and user needs. For example, when the power supply circuit 20 is a storage circuit, the discharge circuit 30 may include two discharge input terminals, the first discharge input terminal is connected to the positive output terminal of the power supply circuit 20, and the second discharge input terminal is connected to the negative output terminal of the power supply circuit 20, and is used to discharge the output voltage of the power supply circuit 20 according to the control of the controller 40; when the power supply circuit 20 is a voltage stabilizing circuit (such as a linear voltage stabilizing circuit), the discharge circuit 30 may include four discharge input terminals, the first discharge input terminal is connected to the positive input terminal of the power supply circuit 20, the second discharge input terminal is connected to the negative input terminal of the power supply circuit 20, the third discharge input terminal is connected to the positive output terminal of the power supply circuit 20, and the fourth discharge input terminal is connected to the negative output terminal of the power supply circuit 20, and is used to discharge the input voltage and output voltage of the power supply circuit 20 according to the control of the controller 40, so as to quickly adjust the voltage difference between the front and rear ends of the power supply circuit 20 when the voltage is lowered.

[0055] Correspondingly, the specific discharge process of the discharge circuit 30, that is, the specific circuit structure of the discharge circuit 30, can be set by the designer according to the practical scenario and user needs. For example, when the discharge circuit 30 can include four discharge input terminals, the discharge circuit 30 can discharge the voltages of the positive input terminal, the negative input terminal, the positive output terminal and the negative output terminal of the power supply circuit 20 according to the control signal output by a discharge control terminal of the controller 40; for example, the discharge circuit 30 can detect the target signal (such as a high level signal) output by a control terminal of the controller 40, and the input voltage and output voltage (such as Figure 3 The discharge circuit 30 can also discharge the input voltage and output voltage of the power supply circuit 20 according to the control signals output by the two discharge control terminals of the controller 40; Figure 3 As shown, the discharge circuit 30 in this embodiment may include a first discharge circuit 31 and a second discharge circuit 32; the first discharge circuit 31 can discharge the voltages of the input terminal of the positive linear voltage regulator circuit 21 and the input terminal of the negative linear voltage regulator circuit 22 simultaneously according to the control signal output by the controller 40, that is, discharge the input voltage of the power supply circuit 20; the second discharge circuit 32 can discharge the voltages of the positive input terminal and the negative input terminal of the power supply of the transmitting circuit simultaneously according to the control signal output by the controller 40, that is, discharge the output voltage of the power supply circuit 20. The discharge circuit 30 can also discharge the voltages of the positive input terminal, the negative input terminal, the positive output terminal and the negative output terminal of the power supply circuit 20 respectively according to the control signals output by the four discharge control terminals of the controller 40. This embodiment does not impose any restrictions on this.

[0056] Specifically, Figure 3As shown, the discharge circuit 30 may include: a first discharge circuit 31 and a second discharge circuit 32; wherein the first discharge input terminal of the first discharge circuit 31 is connected to the input terminal of the positive linear voltage regulator circuit 21 (i.e., the positive input terminal of the power supply circuit 20) as the first discharge input terminal of the discharge circuit 30, and the second discharge input terminal of the first discharge circuit 31 is connected to the input terminal of the negative linear voltage regulator circuit 22 (i.e., the negative input terminal of the power supply circuit 20) as the second discharge input terminal of the discharge circuit 30; the control input terminal of the first discharge circuit 31 is connected to the controller 40, and is used to control the input terminal of the positive linear voltage regulator circuit 21 when the first target signal output by the controller 40 is detected. and the voltage at the input end of the negative linear voltage regulator circuit 22 is discharged; the first discharge input end of the second discharge circuit 32 is connected to the output end of the positive linear voltage regulator circuit 21 (i.e., the positive output end of the power supply circuit 20) as the third discharge input end of the discharge circuit 30, and the second discharge input end of the second discharge circuit 32 is connected to the output end of the negative linear voltage regulator circuit 22 (i.e., the negative output end of the power supply circuit 20) as the fourth discharge input end of the discharge circuit 30; the control input end of the second discharge circuit 32 is connected to the controller 40, and is used to discharge the voltage at the positive input end and the negative input end of the power supply of the transmitting circuit when the second target signal output by the controller 40 is detected.

[0057] Correspondingly, the first discharge circuit 31 and the second discharge circuit 32 can adopt similar circuit structures. This embodiment takes the circuit structure of the first discharge circuit 31 as an example for demonstration. Figure 4 As shown, the first discharge circuit 31 may include a target signal detection circuit 33, a first control discharge circuit 34 and a second control discharge circuit 35; wherein,

[0058] The input end of the first controlled discharge circuit 34 is connected to the positive input end of the power supply circuit 20 as the first discharge input end of the first discharge circuit 31, the output end of the first controlled discharge circuit 34 is grounded, and the first controlled discharge circuit 34 includes a first controllable switch;

[0059] The input end of the second controlled discharge circuit 35 is connected to the negative input end of the power supply circuit 20 as the second discharge input end of the first discharge circuit 31, the output end of the second controlled discharge circuit 35 is grounded, and the second controlled discharge circuit 35 includes a second controllable switch;

[0060] The input end of the target signal detection circuit 33 is connected to the controller 40 as the control input end of the first discharge circuit 31, and is used to control the first controllable switch and the second controllable switch to be turned on when the first target signal is detected, so as to discharge the input voltage of the positive input end of the power supply circuit 20 and the negative input end of the power supply circuit 20.

[0061] That is to say, when the target signal detection circuit 33 in the first discharge circuit 31 detects the first target signal (such as a high-level signal) output by the controller 40, it can turn on the controllable switches (i.e., the first controllable switch and the second controllable switch) in the first control discharge circuit 34 and the second control discharge circuit 35, thereby connecting the input end of the positive linear voltage regulator circuit 21 and the input end of the negative linear voltage regulator circuit 22 to the ground, and discharging the voltage at the input end of the positive linear voltage regulator circuit 21 and the input end of the negative linear voltage regulator circuit 22.

[0062] Specifically, Figure 4 As shown, the first controllable switch Q1 is specifically an NMOS tube, the second controllable switch Q2 is specifically a PMOS tube, and when the first target signal is a high-level signal, the target signal detection circuit 33 may include: a first operational amplifier U11, a second operational amplifier U12, a first NPN transistor U21, a second NPN transistor U22, a first PNP transistor U31, a second PNP transistor U32, a first resistor R1, and a second resistor 12; wherein the in-phase input terminal of the first operational amplifier U11 and the inverting input terminal of the second operational amplifier U12 are connected to their common terminal as the input terminal of the target signal detection circuit 33 and connected to the controller 40, the inverting input terminal of the first operational amplifier U11 is connected to the in-phase input terminal of the second operational amplifier U12, the inverting input terminal of the first operational amplifier U11 is connected to the first end of the first resistor R1 and the first end of the second resistor 12 respectively, and the second end of the first resistor R1 is connected to a preset positive power supply terminal (such as a +12V terminal). , the second end of the second resistor 12 is grounded; the output end of the first operational amplifier U11 is respectively connected to the base of the first NPN transistor U21 and the base of the first PNP transistor U31, the collector of the first NPN transistor U21 is connected to the preset positive power supply terminal, the emitter of the first NPN transistor U21 is connected to the emitter of the first PNP transistor U31, and their common end is connected to the gate of the first controllable switch Q1, and the collector of the first PNP transistor U31 is connected to the preset negative power supply terminal. (such as -12V terminal); the output end of the second operational amplifier U12 is respectively connected to the base of the second NPN transistor U22 and the base of the second PNP transistor U32, the collector of the second NPN transistor U22 is connected to the preset positive power supply terminal, the emitter of the second NPN transistor U22 is connected to the emitter of the second PNP transistor U32, and their common end is connected to the gate of the second controllable switch Q2, and the collector of the second PNP transistor U32 is connected to the preset negative power supply terminal.

[0063] That is to say, Figure 4When the target signal detection circuit 33 detects that the control signal (CONTROL) output by the controller 40 is a high-level signal (i.e., the first target signal), the first operational amplifier U11 can output a high level and the second operational amplifier U12 can output a low level, and the first controllable switch Q1 and the second controllable switch Q2 can be controlled to conduct and discharge respectively. Accordingly, each time the controller 40 outputs a high-level signal to send a discharge action, it can start timing, and send a low-level signal after reaching a preset time to stop discharging, so as to avoid long-term discharge; for example, when it is necessary to lower the input voltage of the transmitting circuit (such as Figure 3 When the output voltage of the DC-DC converter circuit 10 and the input voltage of the transmitting circuit are different from the target voltage by a preset value (such as 5V), the corresponding discharge circuit 30 is closed, and the DC-DC converter circuit 10 and the linear voltage regulator circuit are adjusted to the target value by self-discharge.

[0064] Correspondingly, since the controller 40 may output a lower target value to the DC-DC conversion circuit 10 and the linear voltage regulator circuit, before the output capacitor voltage of the DC-DC conversion circuit 10 and the linear voltage regulator circuit drops to the target value, the DC-DC conversion circuit 10 and the linear voltage regulator circuit can be in a protection shutdown state and will not provide energy to the back end.

[0065] Specifically, Figure 4 As shown, the first controlled discharge circuit 34 in the first discharge circuit 31 may include a first controllable switch Q1 and a forty-fifth resistor R45, that is, the drain of the first controllable switch Q1 is connected to the input end of the positive linear voltage regulator circuit 21 through the forty-fifth resistor R45, and the source of the first controllable switch Q1 is grounded; the second controlled discharge circuit 35 in the first discharge circuit 31 may include a second controllable switch Q2 and a forty-sixth resistor R46, that is, the drain of the second controllable switch Q2 is connected to the input end of the negative linear voltage regulator circuit 22 through the forty-sixth resistor R46, and the source of the second controllable switch Q2 is grounded.

[0066] Correspondingly, such as Figure 4As shown, the target signal detection circuit 33 may also include a forty-seventh resistor R47, that is, the common end connected to the in-phase input end of the first operational amplifier U11 and the inverting input end of the second operational amplifier U12 is grounded through the forty-seventh resistor R47, so that the forty-seventh resistor R47 can be used to pull down the control signal (CONTROL) output by the controller 40 to GND (ground) during the power-on process, so that the entire discharge circuit 30 is in a closed state, avoiding erroneous discharge action during the initialization process of the controller 40; the target signal detection circuit 33 may also include a forty-eighth resistor R48 and a forty-ninth resistor R49 to provide pull-up resistance; the target signal detection circuit 33 may also include an eighteenth capacitor C18 to a twenty-fourth capacitor C24, all of which can play a filtering role; the target signal detection circuit 33 may also include a fiftieth resistor R50 and a fifty-first resistor R51 to prevent signal oscillation.

[0067] Specifically, because the shear wave emission mode has too much instantaneous emission energy and a short time (less than 1ms), the DC-DC converter circuit 10 cannot respond in time, which will cause the output voltage of the DC-DC converter circuit 10 to drop, and eventually cause the voltage emitted to the oscillator to drop, thereby affecting the image effect. Figure 3 As shown, when the power supply circuit 20 in this embodiment is specifically a linear voltage regulator circuit, the power supply circuit 20 may include a positive linear voltage regulator circuit 21 and a negative linear voltage regulator circuit 22; wherein, the input end of the positive linear voltage regulator circuit 21 is connected to the positive output end of the DC-DC conversion circuit 10 as the positive input end of the power supply circuit 20, and the output end of the positive linear voltage regulator circuit 21 is connected to the positive input end of the power supply of the transmitting circuit as the positive output end of the power supply circuit 20; the input end of the negative linear voltage regulator circuit 22 is connected to the negative output end of the DC-DC conversion circuit 10 as the negative input end of the power supply circuit 20, and the output end of the negative linear voltage regulator circuit 22 is connected to the negative input end of the power supply of the transmitting circuit as the negative output end of the power supply circuit 20.

[0068] Correspondingly, the controller 40 can be connected to the DC-DC conversion circuit 10, the positive linear voltage regulator circuit 21 and the negative linear voltage regulator circuit 22 respectively, and is used to control the input and output voltage difference of the positive linear voltage regulator circuit 21 and the negative linear voltage regulator circuit 22 by adjusting the output voltage of the DC-DC conversion circuit 10, the positive linear voltage regulator circuit 21 and the negative linear voltage regulator circuit 22, so as to realize the regulation and control of the input and output voltage of the positive linear voltage regulator circuit 21 and the negative linear voltage regulator circuit 22; so that in this embodiment, the pressure difference between the front and rear ends (i.e., input and output) of the positive linear voltage regulator circuit 21 and the negative linear voltage regulator circuit 22 can be used to play an energy storage role, so that in the shear wave transmission mode of the ultrasonic equipment, as long as the front and rear ends of the linear voltage regulator have a minimum working pressure difference, the stability of the linear voltage regulator output voltage can be guaranteed, and the voltage drop problem of the ultrasonic equipment in the shear wave transmission mode is solved, thereby improving the imaging quality of the ultrasonic equipment and reducing the use of energy storage capacitors; and the response speed of the linear voltage regulator is relatively fast, usually a response speed of several microseconds, which is much greater than the response speed of the switching power supply, so that the stability of the linear voltage regulator output voltage can be adjusted in time.

[0069] That is, in this embodiment, when the ultrasonic device works in the shear wave transmission mode, the controller 40 can control the output voltage of the positive linear voltage regulator circuit 21 (such as Figure 3 The +40V~+70V in the DC-DC converter circuit 10 is lower than the output voltage of the positive output terminal (such as Figure 3 For example, the output voltage of the positive linear voltage regulator circuit 21 is +40V, and the output voltage of the positive output terminal of the DC-DC conversion circuit 10 is +55V, that is, the input-output voltage difference of the positive linear voltage regulator circuit 21 is 15V; the controller 40 can control the output voltage of the negative linear voltage regulator circuit 22 (such as Figure 3 The -40V to -70V in the DC-DC converter circuit 10 is higher than the output voltage of the negative output terminal (such as Figure 3 For example, the output voltage of the negative linear voltage regulator circuit 22 is -40V, and the output voltage of the negative output terminal of the DC-DC conversion circuit 10 is -55V, that is, the input-output voltage difference of the negative linear voltage regulator circuit 22 is 15V.

[0070] It can be understood that the specific structures of the positive linear voltage regulator circuit 21 and the negative linear voltage regulator circuit 22 in this embodiment can be set by the designer according to the practical scenario and user needs. For example, linear regulators (such as low dropout linear regulators, LDO) can be set in both the positive linear voltage regulator circuit 21 and the negative linear voltage regulator circuit 22. The circuit can be set in an integrated manner or a discrete manner. In order to reduce the withstand voltage requirements of the differential linear regulator in the circuit, the positive linear voltage regulator circuit 21 and the negative linear voltage regulator circuit 22 provided in this embodiment can be set in a floating linear voltage regulator manner. As long as the positive linear voltage regulator circuit 21 and the negative linear voltage regulator circuit 22 in this embodiment can adjust their respective output voltages according to the control of the controller 40, this embodiment does not impose any restrictions on this.

[0071] Specifically, Figure 5 As shown, when the positive linear voltage regulator circuit 21 in this embodiment is set in a floating linear voltage regulator mode, the positive linear voltage regulator circuit 21 may include a first digital-to-analog converter 211, a first floating voltage regulator circuit 212, a first voltage regulator circuit 213 provided with a first low voltage difference linear regulator, a first current detection circuit 214 and a first power circuit 215;

[0072] Wherein, the first digital-to-analog converter 211 (such as Figure 6 The input terminal of the DAC1 in the embodiment is connected to the controller 40 (such as Figure 3 The first control terminal of the MCU in Figure 3 The output terminal of the DAC02 signal is connected to the digital signal output by the first control terminal (such as Figure 3 DAC02 signal) is converted into a corresponding voltage value;

[0073] The input end of the first floating voltage regulating circuit 212 is connected to the output end of the first digital-to-analog converter 211, and is used to convert the voltage value output by the first digital-to-analog converter 211 into a first floating voltage;

[0074] The positive output terminal of the DC-DC conversion circuit 10 is connected to the positive input terminal of the power supply of the transmitting circuit through the first current detection circuit 214 and the first voltage regulator circuit 213 in sequence; the floating voltage output terminal of the first floating voltage regulation circuit 212 is connected to the reference terminal of the first low voltage difference linear regulator; the first current detection circuit 214 is used to drive and control the first power circuit 215 to turn on when the current output from the positive output terminal of the DC-DC conversion circuit 10 is detected to be greater than the first current threshold;

[0075] The input and output ends of the first power circuit 215 are respectively connected to the positive output end of the DC-DC conversion circuit 10 and the positive input end of the power supply of the transmitting circuit. The control input end of the first power circuit 215 is connected to the control output end of the first current detection circuit 214, and is used to connect the positive output end of the DC-DC conversion circuit 10 to the positive input end of the power supply of the transmitting circuit according to the control of the first current detection circuit 214, so as to provide load current.

[0076] Specifically, in this embodiment, the first digital-to-analog converter 211 (i.e., Digital to analog converter, DAC) can convert the digital signal output by the first control terminal of the controller 40 into a corresponding voltage value, adjust the floating voltage (i.e., the first floating voltage) output by the first floating voltage adjustment circuit 212, and thus adjust the output voltage of the positive linear voltage regulator circuit 21. For example, the output voltage of the positive linear voltage regulator circuit 21 can be the sum of the first floating voltage and the predetermined output voltage of the first low voltage difference linear regulator in the first voltage regulator circuit 213.

[0077] Correspondingly, the specific manner in which the first floating voltage regulating circuit 212 converts the voltage value output by the first digital-to-analog converter 211 into the first floating voltage, that is, the specific structure of the first floating voltage regulating circuit 212, can be set by the designer, such as Figure 6As shown, the first floating voltage regulating circuit 212 may include: a third operational amplifier U13, a third NPN transistor U23, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a first capacitor C1; wherein the inverting input terminal of the third operational amplifier U13 is connected to the output terminal of the first digital-to-analog converter 211, the first end of the third resistor R3 and the first end of the first capacitor C1 are connected, their common end is connected to the inverting input terminal of the third operational amplifier U13, the second end of the third resistor R3 and the second end of the first capacitor C1 are connected, their common end is connected to the third operational amplifier The output end of the third operational amplifier U13 is connected, the output end of the third operational amplifier U13 is connected to the base of the third NPN transistor U23, the emitter of the third NPN transistor U23 is grounded, the in-phase input end of the third operational amplifier U13 is respectively connected to the first end of the fourth resistor R4 and the first end of the fifth resistor R5, the second end of the fifth resistor R5 is grounded, the second end of the fourth resistor R4 and the collector of the third NPN transistor U23 are connected to the reference end of the first low voltage difference linear regulator as the output end of the first floating voltage regulation circuit 212 (i.e., the floating voltage output end). That is to say, the adjustment of the first floating voltage output by the first floating voltage regulating circuit 212 can be achieved through linear regulated leakage current adjustment. The controller 40 outputs different digital signals through the first control terminal, and can adjust the output voltage (DAC1) of the first digital-to-analog converter 211, thereby adjusting the output of the third operational amplifier U13 to control the overcurrent of the third NPN transistor U23, thereby adjusting the floating voltage; the first floating voltage output by the first floating voltage regulating circuit 212 can be (R4 / R5+1)*DAC1.

[0078] Correspondingly, such as Figure 6 As shown, the first floating voltage regulating circuit 212 may further include a third capacitor C3 having two ends respectively connected to the second end of the fourth resistor R4 and the second end of the fifth resistor R5, for stabilizing the first floating voltage; the first floating voltage regulating circuit 212 may further include a fourth capacitor C4 and a fifth capacitor C5 to play a filtering role; the first floating voltage regulating circuit 212 may further include an eleventh resistor R11 and a twelfth resistor R12 to play a current limiting role.

[0079] It should be noted that, in this embodiment, the first current detection circuit 214 is used to detect whether the load current exceeds a set threshold (ie, the first current threshold), so that when the load current exceeds the set threshold, the first power circuit 215 is turned on and the load current is provided by the first power circuit 215. Figure 5 and Figure 6The positive linear voltage regulator circuit 21 shown is demonstrated by taking the positive output end of the DC-DC conversion circuit 10 as an example of being connected to the positive input end of the power supply of the transmitting circuit through the first current detection circuit 214 and the first voltage regulator circuit 213 in sequence. The positive output end of the DC-DC conversion circuit 10 in the positive linear voltage regulator circuit 21 can also be connected to the positive input end of the power supply of the transmitting circuit through the first voltage regulator circuit 213 and the first current detection circuit 214 in sequence, and this embodiment does not impose any limitation on this.

[0080] Specifically, Figure 6 As shown, the first current detection circuit 214 includes: a sixth resistor R6, a seventh resistor R7, and a third PNP transistor U33; wherein, the first end of the sixth resistor R6 is connected to the positive output end of the DC-DC conversion circuit 10 as the input end of the first current detection circuit 214, the second end of the sixth resistor R6 is connected to the input end of the first voltage regulator circuit 213 as the output end of the first current detection circuit 214, the second end of the sixth resistor R6 is connected to the base of the third PNP transistor U33 through the seventh resistor R7, the emitter of the third PNP transistor U33 is connected to the first end of the sixth resistor R6, and the collector of the third PNP transistor U33 is connected to the control input end of the first power circuit 215 as the control output end of the first current detection circuit 214. That is to say, the first current detection circuit 214 can detect the current flowing through the detection resistor (i.e., the sixth resistor R6), and when the current is greater than the first current threshold, the third PNP transistor U33 is turned on, thereby driving and controlling the first power circuit 215 to be turned on; accordingly, in this embodiment, the first current threshold can be set by selecting the detection resistor (i.e., the sixth resistor R6) and the third PNP transistor U33 in the first current detection circuit 214, that is, the first current threshold is configured by setting the resistance value of the detection resistor and the bias voltage of the third PNP transistor U33.

[0081] Correspondingly, such as Figure 6As shown, the collector of the third PNP transistor U33 can be connected to the floating voltage output end of the first floating voltage regulating circuit 212 to reduce the component requirements (such as withstand voltage requirements) of the third PNP transistor U33; the first current detection circuit 214 can also include a sixth capacitor C6 connected in parallel to the base and collector of the third PNP transistor U33, which plays a filtering role; the first current detection circuit 214 can also include a thirteenth resistor R13, which plays a current limiting role, that is, the collector of the third PNP transistor U33 is connected to the floating voltage output end of the first floating voltage regulating circuit 212 through the thirteenth resistor R13; the first current detection circuit 214 can also include a first diode D1 to prevent current reverse, that is, the anode of the first diode D1 is connected to the collector of the third PNP transistor U33, and the cathode of the first diode D1 is connected to the control input end of the first power circuit 215 as the control output end of the first current detection circuit 214.

[0082] Specifically, the first power circuit 215 in this embodiment may include one or more power sub-circuits, each of which may include a controllable switch, the first end and the second end of which are respectively connected to the positive output end of the DC-DC conversion circuit 10 and the positive input end of the power supply of the transmitting circuit, and the control end of the controllable switch is connected to the control output end of the first current detection circuit 214, and is used to conduct the connection between the positive output end of the DC-DC conversion circuit 10 and the positive input end of the power supply of the transmitting circuit according to the control of the first current detection circuit 214, so as to provide a load current. This embodiment does not limit the specific number of power sub-circuits in the first power circuit 215, such as Figure 6 As shown, when the number of power sub-circuits is 3 and the controllable switches in the power sub-circuit are NMOS tubes, the first power circuit 215 may include a third controllable switch Q3, a fourth controllable switch Q4 and a fifth controllable switch Q5, the drains of the third controllable switch Q3, the fourth controllable switch and the fifth controllable switch are connected to the positive output end of the DC-DC conversion circuit 10, the sources of the third controllable switch Q3, the fourth controllable switch Q4 and the fifth controllable switch Q5 are connected to the positive input end of the power supply of the transmitting circuit, and the gates of the third controllable switch Q3, the fourth controllable switch Q4 and the fifth controllable switch Q5 are connected to the control output end of the first current detection circuit 214 (such as the cathode of the first diode D1).

[0083] Correspondingly, such as Figure 6As shown, the first power circuit 215 may further include a fourteenth resistor R14, a fifteenth resistor R15 and a sixteenth resistor R16, so as to resistively drive the third controllable switch Q3, the fourth controllable switch Q4 and the fifth controllable switch Q5 to prevent signal oscillation, that is, the gates of the third controllable switch Q3, the fourth controllable switch Q4 and the fifth controllable switch Q5 are respectively connected to the control output end of the first current detection circuit 214 through a corresponding resistor; the first power circuit 215 may further include a seventeenth resistor R17, an eighteenth resistor R18 and a nineteenth resistor R19, so that the current detected by the seventeenth resistor R17, the eighteenth resistor R18 can be detected by setting a corresponding current detection circuit. and the current of the nineteenth resistor R19 to determine the current output of the first power circuit 215; the first power circuit 215 may further include a second diode D2, a third diode D3, and a fourth diode D4 to play a voltage stabilizing role, that is, the sources of the third controllable switch Q3, the fourth controllable switch Q4, and the fifth controllable switch Q5 may be respectively connected to the anode of a corresponding diode, and the gates of the third controllable switch Q3, the fourth controllable switch Q4, and the fifth controllable switch Q5 may be respectively connected to the cathode of a corresponding diode; the first power circuit 215 may further include a twentieth resistor R20, a twenty-first resistor R21, and a twenty-second resistor R22 to play a current limiting role.

[0084] Specifically, in this embodiment, the first floating voltage regulating circuit 212 is provided so that the first low voltage dropout linear regulator in the first voltage regulator circuit 213 can adjust the predetermined voltage it outputs based on the first floating voltage, thereby reducing the withstand voltage requirement of the first low voltage dropout linear regulator, so that the output voltage of the first voltage regulator circuit 213 can be the sum of the first floating voltage outputted by the floating voltage output terminal of the first floating voltage regulating circuit 212 and the predetermined voltage outputted by the first low voltage dropout linear regulator. In order to further reduce the withstand voltage requirement of the first low voltage dropout linear regulator, as Figure 6As shown, the first voltage regulator circuit 213 in this embodiment may include: an eighth resistor R8, a ninth resistor R9, a fourth NPN transistor U24 and a first low voltage difference linear regulator U41 (such as a TPS7A4701 chip); wherein the collector of the fourth NPN transistor U24 is connected to the output end of the first current detection circuit 214 as the input end of the first voltage regulator circuit 213, and the base of the fourth NPN transistor U24 is connected to the first end of the eighth resistor R8 and the first end of the ninth resistor R9 respectively. The second end of the eighth resistor R8 is connected to the positive output end of the DC-DC conversion circuit 10, the second end of the ninth resistor R9 and the reference end of the first low voltage difference linear regulator U41 are both connected to the floating voltage output end of the first floating voltage regulation circuit 212, the emitter of the fourth NPN transistor U24 is connected to the input end of the first low voltage difference linear regulator U41, and the output end of the first low voltage difference linear regulator U41 is connected to the positive input end of the power supply of the transmitting circuit as the output end of the first regulator circuit 213. That is to say, by utilizing the voltage division of the eighth resistor R8 and the ninth resistor R9, the fourth NPN transistor U24 can withstand a certain voltage, thereby reducing the voltage pressure of the first low voltage difference linear regulator U41. For example, the eighth resistor R8 and the ninth resistor R9 can use resistors with the same resistance value, so that the fourth NPN transistor U24 and the first low voltage difference linear regulator U41 can both withstand half of the input voltage. For example, when the eighth resistor R8 and the ninth resistor R9 have the same resistance value, if the output voltage of the positive output end of the DC-DC conversion circuit 10 is 60V, and the first floating voltage is 10V, the fourth NPN transistor U24 and the first low voltage difference linear regulator U41 can both withstand a voltage of 25V.

[0085] Correspondingly, such as Figure 6 As shown, the first voltage regulator circuit 213 may also include a twenty-third resistor R23 and a twenty-fourth resistor R24, so as to divide the predetermined voltage output by the first low-voltage difference linear regulator U41 and feed it back to the feedback end of the first low-voltage difference linear regulator U41, so that the first low-voltage difference linear regulator U41 can adjust the output predetermined voltage according to the voltage value input at the feedback end, that is, the output end of the first low-voltage difference linear regulator U41 can be connected to the floating voltage output end (FGND) of the first floating voltage regulation circuit 212 through the twenty-third resistor R23 and the twenty-fourth resistor R24 ​​in sequence, and the feedback end of the first low-voltage difference linear regulator U41 can be connected to the common end connected to the twenty-third resistor R23 and the twenty-fourth resistor R24; the first voltage regulator circuit 213 may also include a seventh capacitor C7, which plays a filtering role.

[0086] Specifically, Figure 6 As shown, the positive linear voltage stabilizing circuit 21 may further include an eighth capacitor C8, a ninth capacitor C9 and a tenth capacitor C10 to play a filtering role.

[0087] Correspondingly, such as Figure 7 As shown, when the negative linear voltage regulator circuit 22 in this embodiment is set in a floating linear voltage regulator mode, the negative linear voltage regulator circuit 22 may include a second digital-to-analog converter 221, a second floating voltage regulation circuit 222, a second voltage regulator circuit 223 provided with a second low voltage difference linear regulator, a second current detection circuit 224, and a second power circuit 225;

[0088] Wherein, the second digital-to-analog converter 221 (such as Figure 8 The input terminal of the DAC2 in the embodiment is connected to the controller 40 (such as Figure 3 The second control terminal of the MCU in Figure 3 The output terminal of the DAC04 signal is connected to the digital signal output by the second control terminal (such as Figure 3 DAC04 signal) is converted into a corresponding voltage value;

[0089] The input end of the second floating voltage regulating circuit 222 is connected to the output end of the second digital-to-analog converter 221, and is used to convert the voltage value output by the second digital-to-analog converter 221 into the output voltage (-VOUT) of the negative linear voltage regulator circuit 22 and the second floating voltage;

[0090] The negative output terminal of the DC-DC conversion circuit 10 is connected to the negative input terminal of the power supply of the transmitting circuit through the second voltage regulator circuit 223 and the second current detection circuit 224 in sequence; the floating voltage output terminal of the second floating voltage regulation circuit 222 is connected to the reference terminal of the second low voltage difference linear regulator; the second current detection circuit 224 is used to drive and control the second power circuit 225 to turn on when the current at the output terminal of the second low voltage difference linear regulator is detected to be greater than the second current threshold;

[0091] The input and output ends of the second power circuit 225 are respectively connected to the negative output end of the DC-DC conversion circuit 10 and the negative input end of the power supply of the transmitting circuit, and the control input end of the second power circuit 225 is connected to the control output end of the second current detection circuit 224.

[0092] Specifically, in this embodiment, the second digital-to-analog converter 221 can convert the digital signal output by the second control terminal of the controller 40 into a corresponding voltage value, adjust the floating voltage (i.e., the second floating voltage) output by the second floating voltage regulation circuit 222 and the output voltage of the negative linear voltage regulator circuit 22; that is, the process of adjusting the output voltage of the negative linear voltage regulator circuit 22 will adjust the current (i.e., the floating current) flowing into the second low voltage difference linear regulator from the floating voltage output terminal of the second floating voltage regulation circuit 222, and set the output voltage of the negative linear voltage regulator circuit 22 by changing the floating current.

[0093] Correspondingly, the specific manner in which the second floating voltage regulating circuit 222 converts the voltage value output by the second digital-to-analog converter 221 into the output voltage of the negative linear voltage regulator circuit 22 and the second floating voltage, that is, the specific structure of the second floating voltage regulating circuit 222, can be set by the designer, such as Figure 8 As shown, the second floating voltage regulating circuit 222 may include: a fourth operational amplifier U14, a fifth operational amplifier U15, a fourth PNP transistor U34, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12 and a second capacitor C2; wherein the inverting input terminal of the fourth operational amplifier U14 is connected to the output terminal of the second digital-to-analog converter 221, the first end of the tenth resistor R10 and the first end of the second capacitor C2 are connected, their common end is connected to the inverting input terminal of the fourth operational amplifier U14, the second end of the tenth resistor R10 and the second end of the second capacitor C2 are connected, their common end is connected to the output terminal of the fourth operational amplifier U14, and the inverting input terminal of the fourth operational amplifier U14 is connected. The input end is connected to the output end of the fifth operational amplifier U15, the non-inverting input end of the fifth operational amplifier U15 is grounded, the inverting input end of the fifth operational amplifier U15 is respectively connected to the first end of the eleventh resistor R11 and the first end of the twelfth resistor R12, and the second end of the eleventh resistor R11 is connected to the negative input end of the power supply of the transmitting circuit as the output end of the negative linear voltage regulator circuit 22; the output end of the fourth operational amplifier U14 is connected to the emitter of the fourth PNP transistor U34, the base of the fourth PNP transistor U34 is grounded, and the collector of the fourth PNP transistor U34 is connected to the reference end of the second low voltage difference linear regulator as the floating voltage output end of the second floating voltage regulation circuit 222. That is to say, the controller 40 can adjust the output voltage (DAC2) of the second digital-to-analog converter 221 by setting the digital signal output by the second control terminal, thereby adjusting the output voltage (-VOUT) and the second floating voltage of the negative linear voltage regulator circuit 22; the output voltage (-VOUT) of the negative linear voltage regulator circuit 22 can be -(R11 / R12)*DAC2, and the second floating voltage can be -DAC2.

[0094] Correspondingly, such as Figure 8As shown, the second floating voltage regulating circuit 222 may also include an eleventh capacitor C11 whose two ends are respectively connected to the collector of the fourth PNP transistor U34 and the base of the fourth PNP transistor U34, for stabilizing the second floating voltage; the second floating voltage regulating circuit 222 may also include a twenty-fifth resistor R25 whose two ends are respectively connected to the collector of the fourth PNP transistor U34 and the base of the fourth PNP transistor U34, for rapid discharge; the second floating voltage regulating circuit 222 may also include a twenty-sixth resistor R26, for current limiting the input of the emitter of the fourth PNP transistor U34, that is, the output end of the fourth operational amplifier U14 is connected to the emitter of the fourth PNP transistor U34 through the twenty-sixth resistor R26; the second floating voltage regulating circuit 222 may also include a twenty-seventh resistor R27 which plays a current limiting role and a twelfth capacitor C12 which plays a filtering role.

[0095] It should be noted that in this embodiment, the second current detection circuit 224 is used to detect whether the load current exceeds the set second current threshold, so that when the load current exceeds the second current threshold, the second power circuit 225 is turned on and the second power circuit 225 provides the load current. Figure 7 and Figure 8 The negative linear voltage regulator circuit 22 shown is demonstrated by taking the negative output end of the DC-DC conversion circuit 10 as an example of being connected to the negative input end of the power supply of the transmitting circuit through the second voltage regulator circuit 223 and the second current detection circuit 224 in sequence. The negative output end of the DC-DC conversion circuit 10 in the negative linear voltage regulator circuit 22 can also be connected to the negative input end of the power supply of the transmitting circuit through the second current detection circuit 224 and the second voltage regulator circuit 223 in sequence, and this embodiment does not impose any limitation on this.

[0096] Specifically, Figure 8As shown, the second current detection circuit 224 may include: a twenty-eighth resistor R28, a twenty-ninth resistor R29 and a fifth PNP transistor U35; wherein, the first end of the twenty-eighth resistor R28 is connected to the output end of the second regulator circuit 33 (such as the output end of U42) as the input end of the second current detection circuit 34, the second end of the twenty-eighth resistor R28 is connected to the negative input end of the power supply of the transmitting circuit as the output end of the second current detection circuit 34, the first end of the twenty-eighth resistor R28 is connected to the base of the fifth PNP transistor U35 through the twenty-ninth resistor R29, the emitter of the fifth PNP transistor U35 is connected to the second end of the twenty-eighth resistor R28, and the collector of the fifth PNP transistor U35 can be connected to the control input end of the second power circuit 35 as the control output end of the second current detection circuit 34. The second current detection circuit 34 can detect the current flowing through the detection resistor (i.e., the twenty-eighth resistor R28). When the current is greater than the second current threshold, the fifth PNP transistor U35 is turned on, thereby driving and controlling the second power circuit 35 to be turned on; accordingly, in this embodiment, the second current threshold can be set by selecting the detection resistor (i.e., the twenty-eighth resistor R28) and the fifth PNP transistor U35 in the second current detection circuit 34, that is, the second current threshold is configured by setting the resistance value of the twenty-eighth resistor R28 and the bias voltage of the fifth PNP transistor U35.

[0097] Correspondingly, such as Figure 8 As shown, the second current detection circuit 224 may further include a sixth PNP transistor U36 and a fifth NPN transistor U25, that is, the collector of the fifth PNP transistor U35 may be connected to the control input terminal of the second power circuit 225 through the sixth PNP transistor U36 and the fifth NPN transistor U25, so as to utilize the arrangement of the sixth PNP transistor U36 and the fifth NPN transistor U25 to improve the driving capability of the collector of the fifth PNP transistor U35 to the controllable switch in the second power circuit 225; that is, the fifth PNP transistor U36 may be connected to the control input terminal of the second power circuit 225 through the sixth PNP transistor U36 and the fifth NPN transistor U25. The collector of the fifth NPN transistor U25 can be connected to the negative output terminal of the DC-DC conversion circuit 10, the base of the fifth NPN transistor U25 and the base of the sixth PNP transistor U36 respectively, the collector of the fifth NPN transistor U25 is grounded, the collector of the sixth PNP transistor U36 is connected to the negative output terminal of the DC-DC conversion circuit 10, the emitter of the fifth NPN transistor U25 is connected to the emitter of the sixth PNP transistor U36, and their common end is connected to the control input terminal of the second power circuit 225 as the control output terminal of the second current detection circuit 224.

[0098] like Figure 8As shown, the second current detection circuit 224 may also include a thirteenth capacitor C13 connected in parallel to the base and collector of the fifth PNP transistor U35, which plays a filtering role; the second current detection circuit 224 may also include a thirteenth resistor R30, which plays a current limiting role, that is, the collector of the fifth PNP transistor U35 is connected to the negative output end of the DC-DC conversion circuit 10 through the thirtieth resistor R30; the second current detection circuit 224 may also include a fourteenth capacitor C14 that plays a filtering role and a thirty-first resistor R31 that plays a current limiting role.

[0099] Specifically, the second power circuit 225 in this embodiment may include one or more power sub-circuits, each of which may include a controllable switch, the first end and the second end of which are respectively connected to the negative output end of the DC-DC conversion circuit 10 and the negative input end of the power supply of the transmitting circuit, and the control end of the controllable switch is connected to the control output end of the second current detection circuit 224, and is used to connect the negative output end of the DC-DC conversion circuit 10 to the negative input end of the power supply of the transmitting circuit according to the control of the second current detection circuit 224, so as to provide a load current. This embodiment does not limit the specific number of power sub-circuits in the second power circuit 225, such as Figure 8 As shown, when the number of power sub-circuits is 3 and the controllable switches in the power sub-circuit are NMOS tubes, the second power circuit 225 may include a sixth controllable switch Q6, a seventh controllable switch Q7 and an eighth controllable switch Q8, the sources of the sixth controllable switch Q6, the seventh controllable switch Q7 and the eighth controllable switch Q8 are connected to the negative output terminal of the DC-DC conversion circuit 10, the drains of the sixth controllable switch Q6, the seventh controllable switch Q7 and the eighth controllable switch Q8 are connected to the negative input terminal of the power supply of the transmitting circuit, and the gates of the sixth controllable switch Q6, the seventh controllable switch Q7 and the eighth controllable switch Q8 are connected to the control output terminal of the second current detection circuit 224.

[0100] Correspondingly, such as Figure 8As shown, the second power circuit 225 may further include a thirty-second resistor R32, a thirty-third resistor R33 and a thirty-fourth resistor R34 for preventing signal oscillation; the second power circuit 225 may further include a thirty-fifth resistor R35, a thirty-sixth resistor R36 and a thirty-seventh resistor R37, so that the current passing through the thirty-fifth resistor R35, the thirty-sixth resistor R36 and the thirty-seventh resistor R37 can be detected by setting a corresponding current detection circuit to determine the current output of the second power circuit 225; the second power circuit 225 may further include a fifth diode D5, a sixth diode D6 and a seventh diode D7 to play a voltage stabilizing role, that is, the source of the sixth controllable switch Q6, the seventh controllable switch Q7 and the eighth controllable switch Q8 can be respectively connected to the anode of a corresponding diode, and the gate of the sixth controllable switch Q6, the seventh controllable switch Q7 and the eighth controllable switch Q8 can be respectively connected to the cathode of a corresponding diode; the second power circuit 225 may further include a thirty-eighth resistor R38, a thirty-ninth resistor R39 and a fortieth resistor R40 to play a current limiting role.

[0101] Specifically, in order to further reduce the withstand voltage requirement of the second low-dropout linear regulator, as Figure 8As shown, the second voltage regulator circuit 223 in this embodiment may include: a forty-first resistor R41, a forty-second resistor R42, a seventh PNP transistor U37 and a second low voltage difference linear regulator U42 (such as a TPS7A3301 chip); wherein the collector of the seventh PNP transistor U37 is connected to the negative output end of the DC-DC conversion circuit 10 as the input end (-VIN) of the second voltage regulator circuit 223, and the base of the seventh PNP transistor U37 is respectively connected to the first end of the forty-first resistor R41 and the forty-second resistor R42. The first end of the forty-first resistor R41 is connected to the negative output end of the DC-DC conversion circuit 10, the second end of the forty-second resistor R42 and the reference end of the second low voltage difference linear regulator U42 are both connected to the floating voltage output end of the second floating voltage regulation circuit 222, the emitter of the seventh PNP transistor U37 is connected to the input end of the second low voltage difference linear regulator U42, and the output end of the second low voltage difference linear regulator U42 is connected to the input end of the second current detection circuit 224 as the output end of the second regulator circuit 223. That is to say, by utilizing the voltage division of the forty-first resistor R41 and the forty-second resistor R42, the seventh PNP transistor U37 can withstand a certain voltage, thereby reducing the voltage pressure of the second low voltage difference linear regulator U42. For example, the forty-first resistor R41 and the forty-second resistor R42 can use resistors with the same resistance value, so that the seventh PNP transistor U37 and the second low voltage difference linear regulator U42 can both withstand half of the input voltage. For example, when the forty-first resistor R41 and the forty-second resistor R42 have the same resistance value, if the output voltage of the negative output end of the DC-DC conversion circuit 10 is -60V, and the first floating voltage is -10V, the seventh PNP transistor U37 and the second low voltage difference linear regulator U42 can both withstand a voltage of 25V.

[0102] Correspondingly, such as Figure 8 As shown, the second voltage regulator circuit 223 may further include a forty-third resistor R43 and a forty-fourth resistor R44, so as to divide the predetermined voltage output by the second low voltage difference linear regulator U42 and feed it back to the feedback end of the second low voltage difference linear regulator U42, that is, the output end of the second low voltage difference linear regulator U42 can be connected to the floating voltage output end (FGND2) of the second floating voltage regulation circuit 222 through the forty-third resistor R43 and the forty-fourth resistor R44 in sequence, and the feedback end of the second low voltage difference linear regulator U42 can be connected to the common end connected to the forty-third resistor R43 and the forty-fourth resistor R44; the second voltage regulator circuit 223 may further include an eighth diode D8 to prevent current reverse.

[0103] Specifically, Figure 8 As shown, the negative linear voltage stabilization circuit 22 may further include a fifteenth capacitor C15, a sixteenth capacitor C16 and a seventeenth capacitor C17 to play a filtering role.

[0104] It should be noted that if Figure 3 As shown, the power supply discharge circuit provided in this embodiment may also include: a first energy storage capacitor, a second energy storage capacitor, a third energy storage capacitor and a fourth energy storage capacitor; wherein, the first end of the first energy storage capacitor is connected to the positive output end of the DC-DC conversion circuit 10, the first end of the second energy storage capacitor is connected to the negative output end of the DC-DC conversion circuit 10, the first end of the third energy storage capacitor is connected to the output end of the positive linear voltage stabilization circuit 21 (i.e., the positive output end of the power supply circuit 20), the first end of the fourth energy storage capacitor is connected to the output end of the negative linear voltage stabilization circuit 22 (i.e., the negative output end of the power supply circuit 20), and the second ends of the first energy storage capacitor, the second energy storage capacitor, the third energy storage capacitor and the fourth energy storage capacitor are all grounded. That is to say, in this embodiment, the capacitor between the positive linear voltage regulator circuit 21 and the DC-DC conversion circuit 10 and the transmitting circuit and the capacitor between the negative linear voltage regulator circuit 22 and the DC-DC conversion circuit 10 and the transmitting circuit can be used to provide energy from the capacitor at the front end of the linear voltage regulator when entering the shear wave transmission mode. Since the capacitor voltage at the front end of the linear voltage regulator is relatively high, it is equivalent to storing a large amount of energy. As the transmission time increases, the energy of the capacitor at the front end of the linear voltage regulator is discharged and the voltage decreases. As long as the linear voltage regulator has a minimum voltage difference during the transmission process, the stability of the linear voltage regulator output voltage can be guaranteed. Correspondingly, the first energy storage capacitor, the second energy storage capacitor, the third energy storage capacitor and the fourth energy storage capacitor can also be set in the DC-DC conversion circuit 10, the positive linear voltage regulator circuit 21 and the negative linear voltage regulator circuit 22, and this embodiment does not impose any restrictions on this.

[0105] It is understandable that if Figure 3As shown, the first control output terminal (DAC01 signal output terminal) of the controller 40 in this embodiment can be connected to the positive voltage control input terminal of the DC-DC conversion circuit 10, and is used to control and adjust the output voltage of the positive output terminal of the DC-DC conversion circuit 10; the second control output terminal (DAC03 signal output terminal) of the controller 40 in this embodiment can be connected to the negative voltage control input terminal of the DC-DC conversion circuit 10, and is used to control and adjust the output voltage of the negative output terminal of the DC-DC conversion circuit 10; the third control output terminal (DAC02 signal output terminal) of the controller 40 can be connected to the positive voltage control input terminal of the DC-DC conversion circuit 10, and is used to control and adjust the output voltage of the negative output terminal of the DC-DC conversion circuit 10. The controller 40 is connected to the control input terminal of the linear voltage regulator circuit 21 to control the output voltage of the output terminal of the positive linear voltage regulator circuit 21; the fourth control output terminal (DAC04 signal output terminal) of the controller 40 is connected to the control input terminal of the negative linear voltage regulator circuit 22 to control the output voltage of the output terminal of the negative linear voltage regulator circuit 22; the discharge control terminal of the controller 40 can be connected to the control input terminal of the discharge circuit 30 to control the discharge circuit 30 to discharge the voltage of the input terminal of the positive linear voltage regulator circuit 21, the input terminal of the negative linear voltage regulator circuit 22 and the positive input terminal and negative input terminal of the power supply of the transmitting circuit. The controller 40 can be specifically a single chip microcomputer (MCU) or other control devices. As long as the controller 40 can realize the output voltage adjustment of the DC-DC conversion circuit 10, the positive linear voltage regulator circuit 21 and the negative linear voltage regulator circuit 22 and the discharge control of the discharge circuit 30, the specific setting position and type of the controller 40 are not limited in this embodiment.

[0106] In this embodiment, the embodiment of the present invention uses the discharge circuit 30 to discharge the input voltage and / or output voltage of the power supply circuit 20 between the DC-DC conversion circuit 10 and the transmitting circuit, thereby increasing the voltage regulation speed when lowering the input voltage of the transmitting circuit to meet the requirement of fast regulation, thereby improving the user experience.

[0107] In addition, an embodiment of the present invention further provides an ultrasonic device, including a transmitting circuit and a power supply and discharge circuit as provided in the above embodiment.

[0108] Specifically, this embodiment does not limit the specific circuit structure or chip type of the transmitting circuit in the ultrasonic device. For example, the transmitting circuit in this embodiment can be implemented in the same or similar manner as the transmitting circuit or transmitting chip in the ultrasonic device in the prior art.

[0109] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the ultrasonic device disclosed in the embodiment, since it corresponds to the power supply and discharge circuit disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0110] The above is a detailed introduction to a power supply and discharge circuit and an ultrasonic device provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A power supply and discharge circuit, characterized in that: Applicable to ultrasonic equipment provided with a transmitting circuit, including: A DC-DC conversion circuit having an input end connected to a DC power supply; A power supply circuit having a positive input terminal and a negative input terminal connected one-to-one with a positive output terminal and a negative output terminal of the DC-DC conversion circuit respectively, and a positive output terminal and a negative output terminal connected one-to-one with a positive input terminal and a negative input terminal of a power supply of the transmitting circuit respectively; a discharge circuit connected to the power supply circuit and a controller connected to the discharge circuit; wherein the controller is used to control the discharge circuit to discharge the input voltage and / or output voltage of the power supply circuit; When the power supply circuit is specifically a linear voltage regulator circuit, the first discharge input terminal of the discharge circuit is connected to the positive input terminal of the power supply circuit, the second discharge input terminal of the discharge circuit is connected to the negative input terminal of the power supply circuit, the third discharge input terminal of the discharge circuit is connected to the positive output terminal of the power supply circuit, and the fourth discharge input terminal of the discharge circuit is connected to the negative output terminal of the power supply circuit; the discharge circuit is used to discharge the input voltage and output voltage of the power supply circuit according to the control of the controller; The discharge circuit comprises: a first discharge circuit and a second discharge circuit; Wherein, the first discharge input terminal of the first discharge circuit is connected to the positive input terminal of the power supply circuit as the first discharge input terminal of the discharge circuit, and the second discharge input terminal of the first discharge circuit is connected to the negative input terminal of the power supply circuit as the second discharge input terminal of the discharge circuit; the control input terminal of the first discharge circuit is connected to the controller, and is used to discharge the input voltages of the positive input terminal of the power supply circuit and the negative input terminal of the power supply circuit when the first target signal output by the controller is detected; The first discharge input terminal of the second discharge circuit is connected to the positive output terminal of the power supply circuit as the third discharge input terminal of the discharge circuit, and the second discharge input terminal of the second discharge circuit is connected to the negative output terminal of the power supply circuit as the fourth discharge input terminal of the discharge circuit; the control input terminal of the second discharge circuit is connected to the controller, and is used to discharge the output voltage of the positive output terminal of the power supply circuit and the negative output terminal of the power supply circuit when the second target signal output by the controller is detected; The power supply discharge circuit also includes: a first energy storage capacitor, a second energy storage capacitor, a third energy storage capacitor and a fourth energy storage capacitor; wherein, the first end of the first energy storage capacitor is connected to the positive output end of the DC-DC conversion circuit, the first end of the second energy storage capacitor is connected to the negative output end of the DC-DC conversion circuit, the first end of the third energy storage capacitor is connected to the positive output end of the power supply circuit, the first end of the fourth energy storage capacitor is connected to the negative output end of the power supply circuit, and the second ends of the first energy storage capacitor, the second energy storage capacitor, the third energy storage capacitor and the fourth energy storage capacitor are all grounded.

2. The power supply and discharge circuit according to claim 1, characterized in that: The first discharge circuit includes: a target signal detection circuit, a first control discharge circuit and a second control discharge circuit; wherein, The input end of the first controlled discharge circuit is connected to the positive input end of the power supply circuit as the first discharge input end of the first discharge circuit, the output end of the first controlled discharge circuit is grounded, and the first controlled discharge circuit includes a first controllable switch; The input end of the second controlled discharge circuit is connected to the negative input end of the power supply circuit as the second discharge input end of the first discharge circuit, the output end of the second controlled discharge circuit is grounded, and the second controlled discharge circuit includes a second controllable switch; The input end of the target signal detection circuit is connected to the controller as the control input end of the first discharge circuit, and is used to control the first controllable switch and the second controllable switch to be turned on when the first target signal is detected, so as to discharge the input voltage of the positive input end and the negative input end of the power supply circuit.

3. The power supply and discharge circuit according to claim 2, characterized in that: The first controllable switch is specifically an NMOS tube, the second controllable switch is specifically a PMOS tube, and when the first target signal is a high-level signal, the target signal detection circuit includes: a first operational amplifier, a second operational amplifier, a first NPN transistor, a second NPN transistor, a first PNP transistor, a second PNP transistor, a first resistor and a second resistor; The common end of the non-inverting input end of the first operational amplifier and the inverting input end of the second operational amplifier are connected to the controller as the input end of the target signal detection circuit, the inverting input end of the first operational amplifier is connected to the non-inverting input end of the second operational amplifier, the inverting input end of the first operational amplifier is respectively connected to the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is connected to the preset positive power supply end, and the second end of the second resistor is grounded; the output end of the first operational amplifier is respectively connected to the base of the first NPN transistor and the base of the first PNP transistor, the collector of the first NPN transistor is connected to the positive power supply end, and the collector of the first NPN transistor is connected to the positive power supply end. The preset positive power supply terminal is connected, the emitter of the first NPN transistor is connected to the emitter of the first PNP transistor, their common end is connected to the gate of the first controllable switch, and the collector of the first PNP transistor is connected to the preset negative power supply terminal; the output end of the second operational amplifier is respectively connected to the base of the second NPN transistor and the base of the second PNP transistor, the collector of the second NPN transistor is connected to the preset positive power supply terminal, the emitter of the second NPN transistor is connected to the emitter of the second PNP transistor, their common end is connected to the gate of the second controllable switch, and the collector of the second PNP transistor is connected to the preset negative power supply terminal.

4. The power supply and discharge circuit according to any one of claims 1 to 3, characterized in that: The discharge circuit includes: a first discharge circuit and a second discharge circuit; wherein, when the power supply circuit is specifically a linear voltage stabilization circuit, the power supply circuit includes: A positive linear voltage stabilizing circuit having an input end connected to the positive output end of the DC-DC conversion circuit and an output end connected to the positive input end of the power supply of the transmitting circuit; A negative linear voltage stabilizing circuit having an input end connected to the negative output end of the DC-DC conversion circuit and an output end connected to the negative input end of the power supply of the transmitting circuit; Wherein, the controller is connected to the DC-DC conversion circuit, the positive linear voltage regulator circuit and the negative linear voltage regulator circuit respectively, and is used to control the input and output voltage difference of the positive linear voltage regulator circuit and the negative linear voltage regulator circuit by adjusting the output voltage of the DC-DC conversion circuit, the positive linear voltage regulator circuit and the negative linear voltage regulator circuit.

5. The power supply and discharge circuit according to claim 4, characterized in that: The positive linear voltage stabilization circuit comprises: a first digital-to-analog converter, a first floating voltage regulation circuit, a first voltage regulator circuit provided with a first low voltage drop linear regulator, a first current detection circuit and a first power circuit; Wherein, the input end of the first digital-to-analog converter is connected to the first control end of the controller, and is used to convert the digital signal output by the first control end into a corresponding voltage value; The input end of the first floating voltage regulating circuit is connected to the output end of the first digital-to-analog converter, and is used to convert the voltage value output by the first digital-to-analog converter into a first floating voltage; The positive output terminal of the DC-DC conversion circuit is connected to the positive input terminal of the power supply of the transmitting circuit through the first current detection circuit and the first voltage regulator circuit in sequence; the floating voltage output terminal of the first floating voltage regulation circuit is connected to the reference terminal of the first low voltage difference linear regulator; the first current detection circuit is used to drive and control the first power circuit to turn on when it is detected that the current output by the positive output terminal of the DC-DC conversion circuit is greater than the first current threshold; The input end and the output end of the first power circuit are respectively connected to the positive output end of the DC-DC conversion circuit and the positive input end of the power supply of the transmitting circuit, and the control input end of the first power circuit is connected to the control output end of the first current detection circuit, and is used to conduct the connection between the positive output end of the DC-DC conversion circuit and the positive input end of the power supply of the transmitting circuit according to the control of the first current detection circuit to provide a load current.

6. The power supply and discharge circuit according to claim 4, characterized in that: The negative linear voltage stabilization circuit comprises: a second digital-analog converter, a second floating voltage regulation circuit, a second voltage regulator circuit provided with a second low voltage difference linear voltage regulator, a second current detection circuit and a second power circuit; Wherein, the input end of the second digital-to-analog converter is connected to the second control end of the controller, and is used to convert the digital signal output by the second control end into a corresponding voltage value; The input end of the second floating voltage regulating circuit is connected to the output end of the second digital-to-analog converter, and is used to convert the voltage value output by the second digital-to-analog converter into the output voltage of the negative linear voltage stabilization circuit and the second floating voltage; The negative output terminal of the DC-DC conversion circuit is connected to the negative input terminal of the power supply of the transmitting circuit through the second voltage regulator circuit and the second current detection circuit in sequence; the floating voltage output terminal of the second floating voltage regulation circuit is connected to the reference terminal of the second low voltage difference linear regulator; the second current detection circuit is used to drive and control the second power circuit to turn on when detecting that the current at the output terminal of the second low voltage difference linear regulator is greater than the second current threshold; The input and output ends of the second power circuit are respectively connected to the negative output end of the DC-DC conversion circuit and the negative power input end of the transmitting circuit, and the control input end of the second power circuit is connected to the control output end of the second current detection circuit.

7. An ultrasonic device, characterized in that: It comprises a transmitting circuit and a power supply and discharge circuit as claimed in any one of claims 1 to 6.

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