Power supply circuit and ultrasonic device

Abstract

The present invention discloses a power supply circuit, which is applied to an ultrasonic device provided with a transmitting circuit, and includes: a DC-DC conversion circuit, a positive linear voltage stabilization circuit, a negative linear voltage stabilization circuit, a discharge circuit and a controller; the present invention adopts a DC-DC+linear voltage stabilization method to power the transmitting circuit through the setting of a positive linear voltage stabilization circuit and a negative linear voltage stabilization circuit, and utilizes the energy storage effect of the voltage difference before and after the linear voltage stabilization to solve the voltage drop problem of the ultrasonic device in the shear wave transmission mode, reduces the use of capacitors, and utilizes the rapid response of the linear voltage stabilization to timely adjust the stability of the linear voltage stabilization output voltage; and through the setting of the discharge circuit, when the voltage before and after the linear voltage stabilization is lowered, the voltage regulation speed can be increased to meet the requirements of rapid regulation, thereby improving the imaging quality and user experience of the ultrasonic device. 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 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 in the figure, the ultrasound equipment uses a DC-DC conversion circuit to directly supply power to the pulse generator (PLUSER) of the transmitting circuit. Since the shear wave transmission mode has too much instantaneous transmission energy and a short time (less than 1ms), the DC-DC conversion circuit cannot respond, which will cause the output voltage of the DC-DC conversion circuit to drop, and ultimately cause the voltage emitted to the oscillator to drop, thereby affecting the image effect. To solve the voltage drop problem, the traditional solution is to increase the output capacitor of the DC-DC conversion circuit or the capacitor at the front end of the transmitting circuit to reduce the voltage drop. Depending on the transmission strategy, the added capacitance is as much as a dozen or dozens of mF, which increases the size of the board and the material cost.

[0004] Therefore, how to solve the voltage drop problem of ultrasonic equipment in shear wave transmission mode, improve the imaging quality of ultrasonic equipment, and enhance user experience is an issue that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide a power supply circuit and an ultrasonic device to solve the voltage drop problem of the ultrasonic device in the shear wave transmission mode, increase the voltage regulation speed, and enhance the imaging quality and user experience of the ultrasonic device.

[0006] In order to solve the above technical problems, the present invention provides a power supply circuit, which is applied to an ultrasonic device provided with a transmitting circuit, comprising:

[0007] A DC-DC conversion circuit having an input end connected to a DC power supply;

[0008] 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;

[0009] 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;

[0010] A discharge circuit having a first discharge input terminal connected to the input terminal of the positive linear voltage regulator circuit, a second discharge input terminal connected to the input terminal of the negative linear voltage regulator circuit, a third discharge input terminal connected to the positive power input terminal of the transmitting circuit, and a fourth discharge input terminal connected to the negative power input terminal of the transmitting circuit;

[0011] A controller is used to control the input-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; the controller is also used to control the discharge circuit to discharge the voltage of the input end of the positive linear voltage regulator circuit, the input end of the negative linear voltage regulator circuit and the positive input end and negative input end of the power supply of the transmitting circuit.

[0012] 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;

[0013] 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;

[0014] 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;

[0015] 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;

[0016] 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.

[0017] Optionally, the first floating voltage regulating circuit includes: a first operational amplifier, a first NPN transistor, a first resistor, a second resistor, a third resistor and a first capacitor;

[0018] Among them, the inverting input terminal of the first operational amplifier is connected to the output terminal of the first digital-to-analog converter, the first end of the first resistor and the first end of the first capacitor are connected at their common end and connected to the inverting input terminal of the first operational amplifier, the second end of the first resistor and the second end of the first capacitor are connected at their common end and connected to the output terminal of the first operational amplifier, the output terminal of the first operational amplifier is connected to the base of the first NPN transistor, the emitter of the first NPN transistor is grounded, the non-inverting input terminal of the first operational amplifier is respectively connected to the first end of the second resistor and the first end of the third resistor, the second end of the third resistor is grounded, and the second end of the second resistor and the collector of the first NPN transistor are connected as the output terminal of the first floating voltage regulation circuit to the reference terminal of the first low voltage difference linear regulator.

[0019] Optionally, the first current detection circuit includes: a fourth resistor, a fifth resistor, and a first PNP transistor;

[0020] Among them, the first end of the fourth resistor is connected to the positive output end of the DC-DC conversion circuit as the input end of the first current detection circuit, the second end of the fourth resistor is connected to the input end of the first voltage regulator circuit as the output end of the first current detection circuit, the second end of the fourth resistor is connected to the base of the first PNP transistor through the fifth resistor, the emitter of the first PNP transistor is connected to the first end of the fourth resistor, and the collector of the first PNP transistor is connected to the control input end of the first power circuit as the control output end of the first current detection circuit.

[0021] Optionally, the first voltage regulator circuit includes: a sixth resistor, a seventh resistor, a second NPN transistor and the first low voltage drop linear regulator;

[0022] Among them, the collector of the second NPN transistor is connected to the output end of the first current detection circuit as the input end of the first voltage regulator circuit, the base of the second NPN transistor is respectively connected to the first end of the sixth resistor and the first end of the seventh resistor, the second end of the sixth resistor is connected to the positive output end of the DC-DC conversion circuit, the second end of the seventh resistor and the reference end of the first low-voltage difference linear regulator are both connected to the floating voltage output end of the first floating voltage regulation circuit, the emitter of the second NPN transistor is connected to the input end of the first low-voltage difference linear regulator, and the output end of the first low-voltage difference linear regulator is connected to the positive input end of the power supply of the transmitting circuit as the output end of the first voltage regulator circuit.

[0023] 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;

[0024] 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;

[0025] 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;

[0026] 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;

[0027] 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.

[0028] Optionally, the second floating voltage regulating circuit includes: a second operational amplifier, a third operational amplifier, a second PNP transistor, an eighth resistor, a ninth resistor, a tenth resistor and a second capacitor;

[0029] Among them, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second digital-to-analog converter, the first end of the eighth resistor and the first end of the second capacitor are connected at their common end and connected to the inverting input terminal of the second operational amplifier, the second end of the eighth resistor and the second end of the second capacitor are connected at their common end and connected to the output terminal of the second operational amplifier, the non-inverting input terminal of the second operational amplifier is connected to the output terminal of the third operational amplifier, the non-inverting input terminal of the third operational amplifier is grounded, the inverting input terminal of the third operational amplifier is respectively connected to the first end of the ninth resistor and the first end of the tenth resistor, the second end of the ninth resistor is connected to the negative input terminal of the power supply of the transmitting circuit as the output terminal of the negative linear voltage regulator circuit; the output terminal of the second operational amplifier is connected to the emitter of the second PNP transistor, the base of the second PNP transistor is grounded, and the collector of the second PNP transistor is connected to the reference terminal of the second low voltage difference linear regulator as the floating voltage output terminal of the second floating voltage regulation circuit.

[0030] Optionally, the power supply 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 output end of the positive linear voltage stabilization circuit, the first end of the fourth energy storage capacitor is connected to the output end of the negative linear voltage stabilization 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.

[0031] Optionally, the discharge circuit includes: a first discharge circuit and a second discharge circuit; wherein,

[0032] The first discharge input terminal of the first discharge circuit is connected to the input terminal of the positive linear voltage regulator 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 input terminal of the negative linear voltage regulator 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 voltages at the input terminals of the positive linear voltage regulator circuit and the negative linear voltage regulator circuit when a first target signal output by the controller is detected;

[0033] The first discharge input terminal of the second discharge circuit is connected to the positive power input terminal of the transmitting 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 power input terminal of the transmitting 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 voltages of the positive power input terminal and the negative power input terminal of the transmitting circuit when a second target signal output by the controller is detected.

[0034] Optionally, the first discharge circuit includes: a target signal detection circuit, a first control discharge circuit and a second control discharge circuit; wherein,

[0035] The input end of the first controlled discharge circuit is connected to the input end of the positive linear voltage regulator 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;

[0036] The input end of the second controlled discharge circuit is connected to the input end of the negative linear voltage regulator 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;

[0037] 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 voltage at the input end of the positive linear voltage regulator circuit and the input end of the negative linear voltage regulator circuit.

[0038] 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 fourth operational amplifier, a fifth operational amplifier, a third NPN transistor, a fourth NPN transistor, a third PNP transistor, a fourth PNP transistor, an eleventh resistor and a twelfth resistor;

[0039] The non-inverting input terminal of the fourth operational amplifier and the inverting input terminal of the fifth operational amplifier are connected to their common terminal as the input terminal of the target signal detection circuit and connected to the controller, the inverting input terminal of the fourth operational amplifier is connected to the non-inverting input terminal of the fifth operational amplifier, the inverting input terminal of the fourth operational amplifier is respectively connected to the first end of the eleventh resistor and the first end of the twelfth resistor, the second end of the eleventh resistor is connected to the preset positive power supply terminal, and the second end of the twelfth resistor is grounded; the output terminal of the fourth operational amplifier is respectively connected to the base of the third NPN transistor and the base of the third PNP transistor, and the collector of the third NPN transistor is connected to the collector of the third NPN transistor. The base of the third NPN transistor is connected to the preset positive power supply terminal, the emitter of the third PNP transistor is connected to the emitter of the third NPN transistor, their common end is connected to the gate of the first controllable switch, and the collector of the third PNP transistor is connected to the preset negative power supply terminal; the output end of the fifth operational amplifier is respectively connected to the base of the fourth NPN transistor and the base of the fourth PNP transistor, the collector of the fourth NPN transistor is connected to the preset positive power supply terminal, the emitter of the fourth NPN transistor is connected to the emitter of the fourth PNP transistor, their common end is connected to the gate of the second controllable switch, and the collector of the fourth PNP transistor is connected to the preset negative power supply terminal.

[0040] The present invention also provides an ultrasonic device, comprising a transmitting circuit and a power supply circuit as described in any one of the above items.

[0041] A power supply circuit provided by the present invention is applied to an ultrasonic device provided with a transmitting circuit, comprising: a DC-DC conversion circuit having an input end connected to a direct current power supply; a positive linear voltage stabilizing circuit having an input end connected to a positive output end of the DC-DC conversion circuit and an output end connected to a positive input end of a power supply of the transmitting circuit; a negative linear voltage stabilizing circuit having an input end connected to a negative output end of the DC-DC conversion circuit and an output end connected to a negative input end of a power supply of the transmitting circuit; a discharge circuit having a first discharge input end connected to an input end of the positive linear voltage stabilizing circuit, a second discharge input end connected to an input end of the negative linear voltage stabilizing circuit, a third discharge input end connected to a positive input end of a power supply of the transmitting circuit, and a fourth discharge input end connected to a negative input end of a power supply of the transmitting circuit; a controller for controlling the input-output voltage difference of the positive linear voltage stabilizing circuit and the negative linear voltage stabilizing circuit by adjusting the output voltages of the DC-DC conversion circuit, the positive linear voltage stabilizing circuit and the negative linear voltage stabilizing circuit; the controller is also used to control the discharge circuit to discharge the voltages of the input end of the positive linear voltage stabilizing circuit, the input end of the negative linear voltage stabilizing circuit, and the positive input end and negative input end of the power supply of the transmitting circuit;

[0042] It can be seen that the present invention adopts the DC-DC+linear voltage regulation method to power the transmitting circuit through the setting of the positive linear voltage regulation circuit and the negative linear voltage regulation circuit, and utilizes the voltage difference before and after the linear voltage regulation to store energy, thereby solving the voltage drop problem of the ultrasonic equipment in the shear wave transmission mode, reducing the use of capacitors, and utilizing the rapid response of the linear voltage regulation to timely adjust the stability of the linear voltage regulation output voltage; and through the setting of the discharge circuit, when lowering the voltage before and after the linear voltage regulation, the voltage regulation speed can be increased to meet the requirements of rapid regulation, thereby improving the imaging quality and user experience of the ultrasonic equipment. In addition, the present invention also provides an ultrasonic device, which also has the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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.

[0044] Figure 1 It is a schematic diagram of the power supply structure of the transmitting circuit of the ultrasonic equipment in the prior art;

[0045] Figure 2 A schematic diagram of the structure of a power supply circuit provided by an embodiment of the present invention;

[0046] Figure 3 A schematic diagram of the structure of another power supply circuit provided by an embodiment of the present invention;

[0047] Figure 4 A schematic structural diagram of a positive linear voltage stabilizing circuit of another power supply circuit provided by an embodiment of the present invention;

[0048] Figure 5 A circuit diagram of another positive linear voltage stabilizing circuit of a power supply circuit provided by an embodiment of the present invention;

[0049] Figure 6 A schematic diagram of the structure of a negative linear voltage stabilizing circuit of another power supply circuit provided by an embodiment of the present invention;

[0050] Figure 7 A circuit diagram of a negative linear voltage stabilizing circuit of another power supply circuit provided by an embodiment of the present invention;

[0051] Figure 8 A circuit diagram of a discharge circuit of another power supply circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0052] 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.

[0053] Please refer to Figure 2 , Figure 2 A schematic diagram of a power supply 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:

[0054] A DC-DC conversion circuit 10 having an input end connected to a DC power supply;

[0055] A positive linear voltage regulator circuit 20 having an input end connected to the positive output end of the DC-DC conversion circuit 10 and an output end connected to the positive input end of the power supply of the transmitting circuit;

[0056] A negative linear voltage regulator circuit 30 having an input end connected to the negative output end of the DC-DC conversion circuit 10 and an output end connected to the negative input end of the power supply of the transmitting circuit;

[0057] A discharge circuit 40 having a first discharge input terminal connected to an input terminal of the positive linear voltage regulator circuit 20, a second discharge input terminal connected to an input terminal of the negative linear voltage regulator circuit 30, a third discharge input terminal connected to a positive power input terminal of the transmitting circuit, and a fourth discharge input terminal connected to a negative power input terminal of the transmitting circuit;

[0058] The controller 50 is used to control the input-output voltage difference of the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30 by adjusting the output voltage of the DC-DC conversion circuit 10, the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30; the controller 50 is also used to control the discharge circuit to discharge the voltage at the input end of the positive linear voltage regulator circuit 20, the input end of the negative linear voltage regulator circuit 30 and the positive input end and negative input end of the power supply of the transmitting circuit.

[0059] It can be understood that the power supply circuit in this embodiment includes a DC-DC conversion circuit 10, a positive linear voltage regulator circuit 20, a negative linear voltage regulator circuit 30, a discharge circuit 40 and a controller 50, and its working principle is:

[0060] The DC-DC conversion circuit 10 is used to convert the DC voltage output by the DC power supply according to the control of the controller 50, and output the 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 linear voltage regulator circuit 20, and the negative DC voltage is input to the negative linear voltage regulator circuit 30. The positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30 are used to convert the input DC voltage into a corresponding power supply voltage that meets the power supply requirements of the transmitting circuit according to the control of the controller 50; in this embodiment, the pressure difference between the front and rear ends (i.e., input and output) of the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30 is used to play an energy storage role, so that in the shear wave transmission mode of the ultrasonic device, 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 device in the shear wave transmission mode is solved, thereby improving the imaging quality of the ultrasonic device, 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. The discharge circuit 40 is used to discharge the output of the DC-DC conversion circuit 10 and the linear voltage regulator (i.e., the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30) according to the control of the controller 50, so as to improve the voltage regulation speed when the output of the DC-DC conversion circuit 10 and the linear voltage regulator is adjusted from a high voltage to a low voltage, and meet the requirements of fast regulation. The controller 50 can adjust the output voltage of the DC-DC conversion circuit 10, the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30, and control the input and output voltage difference of the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30; and control the discharge circuit to discharge the voltage of the input end of the positive linear voltage regulator circuit 20, the input end of the negative linear voltage regulator circuit 30, and the positive input end and the negative input end of the power supply of the transmitting circuit; and realize the regulation control and discharge control of the input and output voltage of the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30.

[0061] Correspondingly, in this embodiment, when the ultrasonic device operates in the shear wave transmission mode, the controller 50 can control the output voltage of the positive linear voltage regulator circuit 20 (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 20 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 20 is 15V; the controller 50 can control the output voltage of the negative linear voltage regulator circuit 30 (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 3For example, the output voltage of the negative linear voltage regulator circuit 30 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 30 is 15V.

[0062] It can be understood that the specific structures of the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30 in this embodiment can be set by the designer according to the practical scenario and user needs. For example, a linear voltage regulator (such as a low-dropout linear voltage regulator, LDO) can be set in both the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30, and the circuit can be set in an integrated manner or a discrete manner. In order to reduce the withstand voltage requirements of the linear voltage regulator in the circuit, the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30 provided in this embodiment can be set in a floating linear voltage regulator manner. As long as the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30 in this embodiment can adjust their respective output voltages according to the control of the controller 50, this embodiment does not impose any restrictions on this.

[0063] Specifically, Figure 4 As shown, when the positive linear voltage regulator circuit 20 in this embodiment is set in a floating linear voltage regulator mode, the positive linear voltage regulator circuit 20 may include a first digital-to-analog converter 21, a first floating voltage regulator circuit 22, a first voltage regulator circuit 23 provided with a first low voltage difference linear regulator, a first current detection circuit 24 and a first power circuit 25;

[0064] Wherein, the first digital-to-analog converter 21 (such as Figure 5 The input terminal of the DAC1 in the embodiment is connected to the controller 50 (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;

[0065] The input end of the first floating voltage regulating circuit 22 is connected to the output end of the first digital-to-analog converter 21, and is used to convert the voltage value output by the first digital-to-analog converter 21 into a first floating voltage;

[0066] 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 24 and the first voltage regulator circuit 23 in sequence; the floating voltage output terminal of the first floating voltage regulation circuit 22 is connected to the reference terminal of the first low voltage difference linear regulator; the first current detection circuit 24 is used to drive and control the first power circuit 25 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;

[0067] The input and output ends of the first power circuit 25 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 25 is connected to the control output end of the first current detection circuit 24, 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 24, so as to provide load current.

[0068] Specifically, in this embodiment, the first digital-to-analog converter 21 (i.e., Digital to analog converter, DAC) can convert the digital signal output by the first control terminal of the controller 50 into a corresponding voltage value, adjust the floating voltage (i.e., the first floating voltage) output by the first floating voltage regulation circuit 22, and thus adjust the output voltage of the positive linear voltage regulator circuit 20. For example, the output voltage of the positive linear voltage regulator circuit 20 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 23.

[0069] Correspondingly, the specific manner in which the first floating voltage regulating circuit 22 converts the voltage value output by the first digital-to-analog converter 21 into the first floating voltage, that is, the specific structure of the first floating voltage regulating circuit 22, can be set by the designer. Figure 5As shown, the first floating voltage regulating circuit 22 may include: a first operational amplifier U11, a first NPN transistor U21, a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C1; wherein the inverting input terminal of the first operational amplifier U11 is connected to the output terminal of the first digital-to-analog converter 21, the first end of the first resistor R1 and the first end of the first capacitor C1 are connected, and their common end is connected to the inverting input terminal of the first operational amplifier U11, and the second end of the first resistor R1 and the second end of the first capacitor C1 are connected, and their common end is connected to the first operational amplifier The output end of the first operational amplifier U11 is connected to the base of the first NPN transistor U21, the emitter of the first NPN transistor U21 is grounded, the non-inverting input end of the first operational amplifier U11 is respectively connected to the first end of the second resistor R2 and the first end of the third resistor R3, the second end of the third resistor R3 is grounded, the second end of the second resistor R2 and the collector of the first NPN transistor U21 are connected as the output end of the first floating voltage regulating circuit 22 (i.e., the floating voltage output end) to the reference end of the first low voltage difference linear regulator. That is to say, the adjustment of the first floating voltage output by the first floating voltage regulating circuit 22 can be adjusted by the linear voltage regulation leakage current adjustment, the controller 50 outputs different digital signals through the first control end, and can adjust the output voltage (DAC1) of the first digital-analog converter 21, thereby adjusting the output of the first operational amplifier U11 to control the overcurrent of the first NPN transistor U21, thereby adjusting the floating voltage; the first floating voltage output by the first floating voltage regulating circuit 22 can be (R2 / R3+1)*DAC1.

[0070] Correspondingly, such as Figure 5 As shown, the first floating voltage regulating circuit 22 may further include a third capacitor C3 having two ends respectively connected to the second end of the second resistor R2 and the second end of the third resistor R3, for stabilizing the first floating voltage; the first floating voltage regulating circuit 22 may further include a fourth capacitor C4 and a fifth capacitor C5 to play a filtering role; the first floating voltage regulating circuit 22 may further include an eleventh resistor R11 and a twelfth resistor R12 to play a current limiting role.

[0071] It should be noted that, in this embodiment, the first current detection circuit 24 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 25 is turned on and the load current is provided by the first power circuit 25. Figure 4 and Figure 5The positive linear voltage regulator circuit 20 shown is demonstrated by taking the positive output end of the DC-DC conversion circuit 10 as an example in which the positive output end is connected to the positive input end of the power supply of the transmitting circuit through the first current detection circuit 24 and the first voltage regulator circuit 23 in sequence. The positive output end of the DC-DC conversion circuit 10 in the positive linear voltage regulator circuit 20 can also be connected to the positive input end of the power supply of the transmitting circuit through the first voltage regulator circuit 23 and the first current detection circuit 24 in sequence, and this embodiment does not impose any limitation on this.

[0072] Specifically, Figure 5 As shown, the first current detection circuit 24 may include: a fourth resistor R4, a fifth resistor R5, and a first PNP transistor U31; wherein the first end of the fourth resistor R4 is connected to the positive output end of the DC-DC conversion circuit 10 as the input end of the first current detection circuit 24, the second end of the fourth resistor R4 is connected to the input end of the first voltage regulator circuit 23 as the output end of the first current detection circuit 24, the second end of the fourth resistor R4 is connected to the base of the first PNP transistor U31 through the fifth resistor R5, the emitter of the first PNP transistor U31 is connected to the first end of the fourth resistor R4, and the collector of the first PNP transistor U31 is connected to the control input end of the first power circuit 25 as the control output end of the first current detection circuit 24. That is to say, the first current detection circuit 24 can detect the current flowing through the detection resistor (i.e., the fourth resistor R4), and when the current is greater than the first current threshold, the first PNP transistor U31 is turned on, thereby driving and controlling the first power circuit 25 to be turned on; accordingly, in this embodiment, the first current threshold can be set by selecting the components of the detection resistor (i.e., the fourth resistor R4) and the first PNP transistor U31 in the first current detection circuit 24, that is, the first current threshold is configured by setting the resistance value of the detection resistor and the bias voltage of the first PNP transistor U31.

[0073] Correspondingly, such as Figure 5 As shown, the collector of the first PNP transistor U31 can be connected to the floating voltage output end of the first floating voltage regulating circuit 22 to reduce the component requirements (such as voltage resistance requirements) for the first PNP transistor U31; the first current detection circuit 24 can also include a sixth capacitor C6 connected in parallel to the base and collector of the first PNP transistor U31, which plays a filtering role; the first current detection circuit 24 can also include a thirteenth resistor R13, which plays a current limiting role, that is, the collector of the first PNP transistor U31 is connected to the floating voltage output end of the first floating voltage regulating circuit 22 through the thirteenth resistor R13; the first current detection circuit 24 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 first PNP transistor U31, and the cathode of the first diode D1 is connected to the control input end of the first power circuit 25 as the control output end of the first current detection circuit 24.

[0074] Specifically, the first power circuit 25 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 24, 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 24, so as to provide a load current. This embodiment does not limit the specific number of power sub-circuits in the first power circuit 25, such as Figure 5 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 25 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 24 (such as the cathode of the first diode D1).

[0075] Correspondingly, such as Figure 5 As shown, the first power circuit 25 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 24 through a corresponding resistor; the first power circuit 25 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 25; the first power circuit 25 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 25 may further include a twentieth resistor R20, a twenty-first resistor R21, and a twenty-second resistor R22 to play a current limiting role.

[0076] Specifically, in this embodiment, the first floating voltage regulating circuit 22 is provided so that the first low voltage drop linear regulator in the first voltage regulator circuit 23 can adjust the predetermined voltage it outputs based on the first floating voltage, thereby reducing the withstand voltage requirement of the first low voltage drop linear regulator, so that the output voltage of the first voltage regulator circuit 23 can be the sum of the first floating voltage outputted by the floating voltage output terminal of the first floating voltage regulating circuit 22 and the predetermined voltage outputted by the first low voltage drop linear regulator. In order to further reduce the withstand voltage requirement of the first low voltage drop linear regulator, as Figure 5 As shown, the first voltage regulator circuit 23 in this embodiment may include: a sixth resistor R6, a seventh resistor R7, a second NPN transistor U22 and a first low voltage difference linear regulator U41 (such as a TPS7A4701 chip); wherein, the collector of the second NPN transistor U22 is connected to the output end of the first current detection circuit 24 as the input end of the first voltage regulator circuit 23, the base of the second NPN transistor U22 is respectively connected to the first end of the sixth resistor R6 and the first end of the seventh resistor R7, the second end of the sixth resistor R6 is connected to the positive output end of the DC-DC conversion circuit 10, the second end of the seventh resistor R7 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 22, the emitter of the second NPN transistor U22 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 voltage regulator circuit 23. That is to say, by utilizing the voltage division of the sixth resistor R6 and the seventh resistor R7, the second NPN transistor U22 can withstand a certain voltage, thereby reducing the voltage pressure of the first low voltage difference linear regulator U41. For example, the sixth resistor R6 and the seventh resistor R7 can use resistors with the same resistance value, so that the second NPN transistor U22 and the first low voltage difference linear regulator U41 can both withstand half of the input voltage. For example, when the sixth resistor R6 and the seventh resistor R7 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 second NPN transistor U22 and the first low voltage difference linear regulator U41 can both withstand a voltage of 25V.

[0077] Correspondingly, such as Figure 5As shown, the first voltage regulator circuit 23 may further 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 then 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 22 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 23 may further include a seventh capacitor C7, which plays a filtering role.

[0078] Specifically, Figure 5 As shown, the positive linear voltage stabilizing circuit 20 may further include an eighth capacitor C8, a ninth capacitor C9 and a tenth capacitor C10 to play a filtering role.

[0079] Correspondingly, such as Figure 6 As shown, when the negative linear voltage regulator circuit 30 in this embodiment is set in a floating linear voltage regulator mode, the negative linear voltage regulator circuit 30 may include a second digital-to-analog converter 31, a second floating voltage regulator circuit 32, a second voltage regulator circuit 33 provided with a second low voltage difference linear regulator, a second current detection circuit 34 and a second power circuit 35;

[0080] Wherein, the second digital-to-analog converter 31 (such as Figure 7 The input terminal of the DAC2 in the embodiment is connected to the controller 50 (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;

[0081] The input end of the second floating voltage regulating circuit 32 is connected to the output end of the second digital-to-analog converter 31, and is used to convert the voltage value output by the second digital-to-analog converter 31 into the output voltage (-VOUT) of the negative linear voltage stabilizing circuit 30 and the second floating voltage;

[0082] 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 33 and the second current detection circuit 34 in sequence; the floating voltage output terminal of the second floating voltage regulation circuit 32 is connected to the reference terminal of the second low voltage difference linear regulator; the second current detection circuit 34 is used to drive and control the second power circuit 35 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;

[0083] The input and output ends of the second power circuit 35 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 35 is connected to the control output end of the second current detection circuit 34.

[0084] Specifically, in this embodiment, the second digital-to-analog converter 31 can convert the digital signal output by the second control terminal of the controller 50 into a corresponding voltage value, adjust the floating voltage (i.e., the second floating voltage) output by the second floating voltage regulation circuit 32 and the output voltage of the negative linear voltage regulator circuit 30; that is, the process of adjusting the output voltage of the negative linear voltage regulator circuit 30 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 32, and set the output voltage of the negative linear voltage regulator circuit 30 by changing the floating current.

[0085] Correspondingly, the specific manner in which the second floating voltage regulating circuit 32 converts the voltage value output by the second digital-to-analog converter 31 into the output voltage of the negative linear voltage regulator circuit 30 and the second floating voltage, that is, the specific structure of the second floating voltage regulating circuit 32, can be set by the designer, such as Figure 7As shown, the second floating voltage regulating circuit 32 may include: a second operational amplifier U12, a third operational amplifier U13, a second PNP transistor U32, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a second capacitor C2; wherein the inverting input terminal of the second operational amplifier U12 is connected to the output terminal of the second digital-to-analog converter 31, the first end of the eighth resistor R8 and the first end of the second capacitor C2 are connected, their common end is connected to the inverting input terminal of the second operational amplifier U12, the second end of the eighth resistor R8 and the second end of the second capacitor C2 are connected, their common end is connected to the output terminal of the second operational amplifier U12, and the in-phase input terminal of the second operational amplifier U12 is connected. The input end is connected to the output end of the third operational amplifier U13, the non-inverting input end of the third operational amplifier U13 is grounded, the inverting input end of the third operational amplifier U13 is respectively connected to the first end of the ninth resistor R9 and the first end of the tenth resistor R10, and the second end of the ninth resistor R9 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 30; the output end of the second operational amplifier U12 is connected to the emitter of the second PNP transistor U32, the base of the second PNP transistor U32 is grounded, and the collector of the second PNP transistor U32 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 32. That is to say, the controller 50 can adjust the output voltage (DAC2) of the second digital-to-analog converter 31 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 30; the output voltage (-VOUT) of the negative linear voltage regulator circuit 30 can be -(R9 / R10)*DAC2, and the second floating voltage can be -DAC2.

[0086] Correspondingly, such as Figure 7 As shown, the second floating voltage regulating circuit 32 may also include an eleventh capacitor C11 whose two ends are respectively connected to the collector and the base of the second PNP transistor U32, so as to stabilize the second floating voltage; the second floating voltage regulating circuit 32 may also include a twenty-fifth resistor R25 whose two ends are respectively connected to the collector and the base of the second PNP transistor U32, so as to discharge quickly; the second floating voltage regulating circuit 32 may also include a twenty-sixth resistor R26, so as to limit the current of the input of the emitter of the second PNP transistor U32, that is, the output end of the second operational amplifier U12 is connected to the emitter of the second PNP transistor U32 through the twenty-sixth resistor R26; the second floating voltage regulating circuit 32 may also include a twenty-seventh resistor R27 which plays a current limiting role and a twelfth capacitor C12 which plays a filtering role.

[0087] It should be noted that in this embodiment, the second current detection circuit 34 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 35 is turned on and the second power circuit 35 provides the load current. Figure 6 and Figure 7 The negative linear voltage regulator circuit 30 shown is demonstrated by taking the negative output end of the DC-DC conversion circuit 10 as an example, in which the negative output end is connected to the negative input end of the power supply of the transmitting circuit through the second voltage regulator circuit 33 and the second current detection circuit 34 in sequence. The negative output end of the DC-DC conversion circuit 10 in the negative linear voltage regulator circuit 30 can also be connected to the negative input end of the power supply of the transmitting circuit through the second current detection circuit 34 and the second voltage regulator circuit 33 in sequence. This embodiment does not impose any limitation on this.

[0088] Specifically, Figure 7 As shown, the second current detection circuit 34 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.

[0089] Correspondingly, such as Figure 7As shown, the second current detection circuit 34 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 35 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 35; that is, the fifth PNP transistor U35 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 35 as the control output terminal of the second current detection circuit 34.

[0090] like Figure 7 As shown, the second current detection circuit 34 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 34 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 34 may also include a fourteenth capacitor C14 that plays a filtering role and a thirty-first resistor R31 that plays a current limiting role.

[0091] Specifically, the second power circuit 35 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 34, 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 34, so as to provide a load current. This embodiment does not limit the specific number of power sub-circuits in the second power circuit 35, such as Figure 7As 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 35 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 34.

[0092] Correspondingly, such as Figure 7 As shown, the second power circuit 35 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 35 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 35; the second power circuit 35 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 35 may further include a thirty-eighth resistor R38, a thirty-ninth resistor R39 and a fortieth resistor R40 to play a current limiting role.

[0093] Specifically, in order to further reduce the withstand voltage requirement of the second low-dropout linear regulator, as Figure 7As shown, the second voltage regulator circuit 33 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 33, 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 32, 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 34 as the output end of the second regulator circuit 33. 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.

[0094] Correspondingly, such as Figure 7 As shown, the second voltage regulator circuit 33 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 32 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 33 may further include an eighth diode D8 to prevent current reverse.

[0095] Specifically, Figure 7 As shown, the positive linear voltage stabilizing circuit 20 may further include a fifteenth capacitor C15, a sixteenth capacitor C16 and a seventeenth capacitor C17 to perform filtering.

[0096] It can be understood that the discharge circuit 40 in this embodiment can discharge the voltages at the input end of the positive linear voltage regulator circuit 20, the input end of the negative linear voltage regulator circuit 30, and the positive input end and negative input end of the power supply of the transmitting circuit according to the control of the controller 50. The specific discharge mode of the discharge circuit 40, that is, the specific circuit structure of the discharge circuit 40, can be set by the designer according to the practical scenario and user needs. For example, the discharge circuit 40 can discharge the voltages at the input end of the positive linear voltage regulator circuit 20, the input end of the negative linear voltage regulator circuit 30, and the positive input end and negative input end of the power supply of the transmitting circuit according to the control signal output by a discharge control end of the controller 50; for example, the discharge circuit 40 can discharge the voltages at the input end of the positive linear voltage regulator circuit 20, the input end of the negative linear voltage regulator circuit 30, and the positive input end and negative input end of the power supply of the transmitting circuit when detecting a target signal (such as a high-level signal) output by a control end of the controller 50. Figure 3 The discharge circuit 40 can also discharge the input voltage and output voltage of the power supply circuit according to the control signals output by the two discharge control terminals of the controller 50; Figure 3 As shown, the discharge circuit 40 in this embodiment may include a first discharge circuit 41 and a second discharge circuit 42; the first discharge circuit 41 may discharge the voltages of the input terminal of the positive linear voltage regulator circuit 20 and the input terminal of the negative linear voltage regulator circuit 30 simultaneously according to the control signal output by the controller 50; the second discharge circuit 42 may discharge the voltages of the positive power input terminal and the negative power input terminal of the transmitting circuit simultaneously according to the control signal output by the controller 50. The discharge circuit 40 may also discharge the voltages of the input terminal of the positive linear voltage regulator circuit 20, the input terminal of the negative linear voltage regulator circuit 30, and the positive power input terminal and the negative power input terminal of the transmitting circuit respectively according to the control signals output by the four discharge control terminals of the controller 50.

[0097] Specifically, Figure 3As shown, the discharge circuit 40 may include: a first discharge circuit 41 and a second discharge circuit 42; wherein, the first discharge input terminal of the first discharge circuit 41 is connected to the input terminal of the positive linear voltage regulator circuit 20 as the first discharge input terminal of the discharge circuit 40, and the second discharge input terminal of the first discharge circuit 41 is connected to the input terminal of the negative linear voltage regulator circuit 30 as the second discharge input terminal of the discharge circuit 40; the control input terminal of the first discharge circuit 41 is connected to the controller 50, and is used to discharge the voltages of the input terminal of the positive linear voltage regulator circuit 20 and the input terminal of the negative linear voltage regulator circuit 30 when the first target signal output by the controller 50 is detected; the first discharge input terminal of the second discharge circuit 42 is connected to the positive power input terminal of the transmitting circuit as the third discharge input terminal of the discharge circuit 40, and the second discharge input terminal of the second discharge circuit 42 is connected to the negative power input terminal of the transmitting circuit as the fourth discharge input terminal of the discharge circuit 40; the control input terminal of the second discharge circuit 42 is connected to the controller 50, and is used to discharge the voltages of the positive power input terminal and the negative power input terminal of the transmitting circuit when the second target signal output by the controller 50 is detected.

[0098] Correspondingly, the first discharge circuit 41 and the second discharge circuit 42 can adopt similar circuit structures. This embodiment takes the circuit structure of the first discharge circuit 41 as an example for demonstration. Figure 8 As shown, the first discharge circuit 41 may include a target signal detection circuit 43, a first control discharge circuit 44 and a second control discharge circuit 45; wherein,

[0099] The input end of the first controlled discharge circuit 44 is connected to the input end of the positive linear voltage regulator circuit 20 as the first discharge input end of the first discharge circuit 41, the output end of the first controlled discharge circuit 44 is grounded, and the first controlled discharge circuit 44 includes a first controllable switch;

[0100] The input end of the second controlled discharge circuit 45 is connected to the input end of the negative linear voltage regulator circuit 30 as the second discharge input end of the first discharge circuit 41, the output end of the second controlled discharge circuit 45 is grounded, and the second controlled discharge circuit 45 includes a second controllable switch;

[0101] The input end of the target signal detection circuit 43 is connected to the controller 50 as the control input end of the first discharge circuit 41, 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 voltage at the input end of the positive linear voltage regulator circuit 20 and the input end of the negative linear voltage regulator circuit 30.

[0102] That is to say, when the target signal detection circuit 43 in the first discharge circuit 41 detects the first target signal (such as a high level signal) output by the controller 50, the controllable switches (i.e., the first controllable switch and the second controllable switch) in the first control discharge circuit 44 and the second control discharge circuit 45 can be turned on, so that the input end of the positive linear voltage regulator circuit 20 and the input end of the negative linear voltage regulator circuit 30 are connected to the ground, and the voltage of the input end of the positive linear voltage regulator circuit 20 and the input end of the negative linear voltage regulator circuit 30 is discharged; 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 differ from the target voltage by a preset value (such as 5V), the corresponding discharge circuit is closed, and the DC-DC converter circuit 10, the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30 are self-discharged and adjusted to the target value.

[0103] Correspondingly, since the controller 50 may output a lower target value to the DC-DC conversion circuit 10, the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30, before the output capacitor voltage of the DC-DC conversion circuit 10, the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30 drops to the target value, the DC-DC conversion circuit 10, the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30 can be in a protection shutdown state and will not provide energy to the back end.

[0104] Specifically, Figure 8As 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 43 may include: a fourth operational amplifier U14, a fifth operational amplifier U15, a third NPN transistor U23, a fourth NPN transistor U24, a third PNP transistor U33, a fourth PNP transistor U34, an eleventh resistor R11 and a twelfth resistor R12; wherein the in-phase input terminal of the fourth operational amplifier U14 and the inverting input terminal of the fifth operational amplifier U15 are connected to their common terminal as the input terminal of the target signal detection circuit 43 and connected to the controller 50, the inverting input terminal of the fourth operational amplifier U14 is connected to the in-phase input terminal of the fifth operational amplifier U15, the inverting input terminal of the fourth operational amplifier U14 is connected to the first terminal of the eleventh resistor R11 and the first terminal of the twelfth resistor R12 respectively, and the second terminal of the eleventh resistor R11 is connected to a preset positive power supply terminal (such as +12V The output end of the fourth operational amplifier U14 is connected to the base of the third NPN transistor U23 and the base of the third PNP transistor U33 respectively, the collector of the third NPN transistor U23 is connected to the preset positive power supply terminal, the emitter of the third NPN transistor U23 is connected to the emitter of the third PNP transistor U33, and their common end is connected to the gate of the first controllable switch Q1, and the collector of the third PNP transistor U33 is connected to the preset negative power supply terminal. The output end of the fifth operational amplifier U15 is respectively connected to the base of the fourth NPN transistor U24 and the base of the fourth PNP transistor U34, the collector of the fourth NPN transistor U24 is connected to the preset positive power supply terminal, the emitter of the fourth NPN transistor U24 is connected to the emitter of the fourth PNP transistor U34, and their common end is connected to the gate of the second controllable switch Q2, and the collector of the fourth PNP transistor U34 is connected to the preset negative power supply terminal.

[0105] That is to say, Figure 8 When the target signal detection circuit 43 detects that the control signal (CONTROL) output by the controller 50 is a high level signal (i.e., the first target signal), the fourth operational amplifier U14 can output a high level and the fifth operational amplifier U15 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 50 outputs a high level signal to issue a discharge action, the timing can be started, and a low level signal can be issued after the preset time is reached to stop the discharge, so as to avoid long-term discharge.

[0106] Specifically, Figure 8As shown, the first controlled discharge circuit 44 in the first discharge circuit 41 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 20 through the forty-fifth resistor R45, and the source of the first controllable switch Q1 is grounded; the second controlled discharge circuit 45 in the first discharge circuit 41 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 30 through the forty-sixth resistor R46, and the source of the second controllable switch Q2 is grounded.

[0107] Correspondingly, such as Figure 8 As shown, the target signal detection circuit 43 may also include a forty-seventh resistor R47, that is, the common end connected to the in-phase input end of the fourth operational amplifier U14 and the inverting input end of the fifth operational amplifier U15 is grounded through the forty-seventh resistor R47, so that the control signal (CONTROL) output by the controller 50 is pulled down to GND (ground) by the forty-seventh resistor R47 during the power-on process, so that the entire discharge circuit 40 is in a closed state, avoiding erroneous discharge action during the initialization process of the controller 50; the target signal detection circuit 43 may also include a forty-eighth resistor R48 and a forty-ninth resistor R49 to provide pull-up resistance; the target signal detection circuit 43 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 43 may also include a fiftieth resistor R50 and a fifty-first resistor R51 to prevent signal oscillation.

[0108] It should be noted that if Figure 3As shown, the power supply 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 20, the first end of the fourth energy storage capacitor is connected to the output end of the negative linear voltage stabilization circuit 30, 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 20 and the DC-DC conversion circuit 10 and the transmitting circuit and the capacitor between the negative linear voltage regulator circuit 30 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 20 and the negative linear voltage regulator circuit 30, and this embodiment does not impose any restrictions on this.

[0109] It can be understood that the first control output terminal of the controller 50 in this embodiment is 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 of the controller 50 in this embodiment is 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 of the controller 50 is connected to the control input terminal of the positive linear voltage regulator circuit 20, and is used to control the output voltage of the output terminal of the positive linear voltage regulator circuit 20; the fourth control output terminal of the controller 50 is connected to the control input terminal of the negative linear voltage regulator circuit 30, and is used to control the output voltage of the output terminal of the negative linear voltage regulator circuit 30; the discharge control terminal of the controller 50 is connected to the control input terminal of the discharge circuit 40, and is used to control the discharge circuit 40, and discharge the voltages of the input terminal of the positive linear voltage regulator circuit 20, the input terminal of the negative linear voltage regulator circuit 30, and the positive input terminal and negative input terminal of the power supply of the transmitting circuit. The controller 50 can be specifically a single-chip microcomputer (MCU) or other control devices. As long as the controller 50 can realize the output voltage adjustment of the DC-DC conversion circuit 10 , the positive linear voltage regulator circuit 20 and the negative linear voltage regulator circuit 30 and the discharge control of the discharge circuit 40 , this embodiment does not limit the specific setting position and type of the controller 50 .

[0110] In the present embodiment, the embodiment of the present invention adopts a DC-DC+linear voltage regulation method to power the transmitting circuit through the setting of a positive linear voltage regulator circuit 20 and a negative linear voltage regulator circuit 30, and utilizes the voltage difference before and after the linear voltage regulation to store energy, thereby solving the voltage drop problem of the ultrasonic equipment in the shear wave transmission mode, reducing the use of capacitors, and utilizing the fast response of the linear voltage regulation to timely adjust the stability of the linear voltage regulation output voltage; and through the setting of the discharge circuit 40, when lowering the voltage before and after the linear voltage regulation, the voltage regulation speed can be increased to meet the requirements of fast regulation, thereby improving the imaging quality and user experience of the ultrasonic equipment.

[0111] In addition, an embodiment of the present invention further provides an ultrasonic device, including a transmitting circuit and a power supply circuit as provided in the above embodiment.

[0112] 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.

[0113] 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 circuit disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the power supply circuit part.

[0114] The above is a detailed introduction to a power supply circuit and ultrasonic equipment provided by the present invention. Specific examples are used in this article 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, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A power supply 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 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; A discharge circuit having a first discharge input terminal connected to the input terminal of the positive linear voltage regulator circuit, a second discharge input terminal connected to the input terminal of the negative linear voltage regulator circuit, a third discharge input terminal connected to the positive power input terminal of the transmitting circuit, and a fourth discharge input terminal connected to the negative power input terminal of the transmitting circuit; A controller, used to control the input-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; the controller is also used to control the discharge circuit to discharge the voltage of the input end of the positive linear voltage regulator circuit, the input end of the negative linear voltage regulator circuit and the positive input end and negative input end of the power supply of the transmitting circuit; 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, so as to provide a load current; 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.

2. The power supply circuit according to claim 1, characterized in that: The first floating voltage regulating circuit comprises: a first operational amplifier, a first NPN transistor, a first resistor, a second resistor, a third resistor and a first capacitor; Among them, the inverting input terminal of the first operational amplifier is connected to the output terminal of the first digital-to-analog converter, the common terminal connected to the first end of the first resistor and the first end of the first capacitor is connected to the inverting input terminal of the first operational amplifier, the common terminal connected to the second end of the first resistor and the second end of the first capacitor is connected to the output terminal of the first operational amplifier, the output terminal of the first operational amplifier is connected to the base of the first NPN transistor, the emitter of the first NPN transistor is grounded, the non-inverting input terminal of the first operational amplifier is respectively connected to the first end of the second resistor and the first end of the third resistor, the second end of the third resistor is grounded, and the second end of the second resistor and the collector of the first NPN transistor are connected to the reference terminal of the first low voltage difference linear regulator as the output terminal of the first floating voltage regulation circuit.

3. The power supply circuit according to claim 1, characterized in that: The first current detection circuit includes: a fourth resistor, a fifth resistor, and a first PNP transistor; Among them, the first end of the fourth resistor is connected to the positive output end of the DC-DC conversion circuit as the input end of the first current detection circuit, the second end of the fourth resistor is connected to the input end of the first voltage regulator circuit as the output end of the first current detection circuit, the second end of the fourth resistor is connected to the base of the first PNP transistor through the fifth resistor, the emitter of the first PNP transistor is connected to the first end of the fourth resistor, and the collector of the first PNP transistor is connected to the control input end of the first power circuit as the control output end of the first current detection circuit.

4. The power supply circuit according to claim 1, characterized in that: The first voltage regulator circuit comprises: a sixth resistor, a seventh resistor, a second NPN transistor and the first low voltage drop linear regulator; Among them, the collector of the second NPN transistor is connected to the output end of the first current detection circuit as the input end of the first voltage regulator circuit, the base of the second NPN transistor is respectively connected to the first end of the sixth resistor and the first end of the seventh resistor, the second end of the sixth resistor is connected to the positive output end of the DC-DC conversion circuit, the second end of the seventh resistor and the reference end of the first low-voltage difference linear regulator are both connected to the floating voltage output end of the first floating voltage regulation circuit, the emitter of the second NPN transistor is connected to the input end of the first low-voltage difference linear regulator, and the output end of the first low-voltage difference linear regulator is connected to the positive input end of the power supply of the transmitting circuit as the output end of the first voltage regulator circuit.

5. The power supply circuit according to claim 1, characterized in that: The second floating voltage regulating circuit includes: a second operational amplifier, a third operational amplifier, a second PNP transistor, an eighth resistor, a ninth resistor, a tenth resistor and a second capacitor; Among them, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second digital-to-analog converter, the common terminal connected to the first terminal of the eighth resistor and the first terminal of the second capacitor is connected to the inverting input terminal of the second operational amplifier, the common terminal connected to the second terminal of the eighth resistor and the second terminal of the second capacitor is connected to the output terminal of the second operational amplifier, the non-inverting input terminal of the second operational amplifier is connected to the output terminal of the third operational amplifier, the non-inverting input terminal of the third operational amplifier is grounded, the inverting input terminal of the third operational amplifier is respectively connected to the first terminal of the ninth resistor and the first terminal of the tenth resistor, the second terminal of the ninth resistor is connected to the negative input terminal of the power supply of the transmitting circuit as the output terminal of the negative linear voltage regulator circuit; the output terminal of the second operational amplifier is connected to the emitter of the second PNP transistor, the base of the second PNP transistor is grounded, and the collector of the second PNP transistor is connected to the reference terminal of the second low voltage difference linear regulator as the floating voltage output terminal of the second floating voltage regulation circuit.

6. The power supply circuit according to claim 1, characterized in that: 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 output end of the positive linear voltage stabilization circuit, the first end of the fourth energy storage capacitor is connected to the output end of the negative linear voltage stabilization 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.

7. The power supply circuit according to any one of claims 1 to 6, characterized in that: 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 input terminal of the positive linear voltage regulator 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 input terminal of the negative linear voltage regulator 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 voltages at the input terminals of the positive linear voltage regulator circuit and the negative linear voltage regulator circuit when a first target signal output by the controller is detected; The first discharge input terminal of the second discharge circuit is connected to the positive power input terminal of the transmitting 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 power input terminal of the transmitting 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 voltages of the positive power input terminal and the negative power input terminal of the transmitting circuit when a second target signal output by the controller is detected.

8. The power supply circuit according to claim 7, 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 input end of the positive linear voltage regulator 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 input end of the negative linear voltage regulator 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 voltage at the input end of the positive linear voltage regulator circuit and the input end of the negative linear voltage regulator circuit.

9. The power supply circuit according to claim 8, characterized in that: The first controllable switch is specifically an NMOS transistor, the second controllable switch is specifically a PMOS transistor, and when the first target signal is a high level signal, the target signal detection circuit includes: a fourth operational amplifier, a fifth operational amplifier, a third NPN transistor, a fourth NPN transistor, a third PNP transistor, a fourth PNP transistor, an eleventh resistor and a twelfth resistor; The common end connected to the in-phase input end of the fourth operational amplifier and the inverting input end of the fifth operational amplifier is connected to the controller as the input end of the target signal detection circuit, the inverting input end of the fourth operational amplifier is connected to the in-phase input end of the fifth operational amplifier, the inverting input end of the fourth operational amplifier is respectively connected to the first end of the eleventh resistor and the first end of the twelfth resistor, the second end of the eleventh resistor is connected to the preset positive power supply end, and the second end of the twelfth resistor is grounded; the output end of the fourth operational amplifier is respectively connected to the base of the third NPN transistor and the base of the third PNP transistor, and the collector of the third NPN transistor The base of the third NPN transistor is connected to the preset positive power supply terminal, the common end at which the emitter of the third NPN transistor and the emitter of the third PNP transistor are connected is connected to the gate of the first controllable switch, and the collector of the third PNP transistor is connected to the preset negative power supply terminal; the output end of the fifth operational amplifier is respectively connected to the base of the fourth NPN transistor and the base of the fourth PNP transistor, the collector of the fourth NPN transistor is connected to the preset positive power supply terminal, the common end at which the emitter of the fourth NPN transistor and the emitter of the fourth PNP transistor are connected is connected to the gate of the second controllable switch, and the collector of the fourth PNP transistor is connected to the preset negative power supply terminal.

10. An ultrasonic device, characterized in that: It comprises a transmitting circuit and a power supply circuit as claimed in any one of claims 1 to 9.

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