An ultralong endurance portable ultrasonic system

Abstract

The application discloses a portable ultrasonic system with super-long endurance, which comprises a shell, a plurality of function modules, a power management board, a main battery and a secondary battery are arranged in the shell, the power management board is connected with the main battery, the secondary battery and the function modules, when the power management board detects that an adapter is inserted, the power management board is switched to adapter power supply and charges the main battery and the secondary battery, when the power management board detects battery power supply, the power management board automatically switches corresponding battery power supply according to the electric quantity of the main battery and the secondary battery, converts the first voltage during power supply into a plurality of other voltages, and separately supplies power to the function modules. The function modules are independently powered, hierarchical and zoned power supply control is realized; the main battery and the secondary battery and three power supply modes are arranged, the power supply mode can be automatically switched, the endurance time is greatly prolonged, and the problem that the endurance time of the existing notebook ultrasonic system is short is solved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a portable ultrasound system with ultra-long battery life. Background Technology

[0002] Portable ultrasound diagnostic equipment has been widely used in emergency departments, bedside diagnosis, field rescue, and primary healthcare units due to its high flexibility and ease of use. Among them, laptop ultrasound systems integrate the ultrasound host and probe into a portable device the size of a laptop, combining high performance and portability, and represent an important development direction in the current market.

[0003] However, existing laptop ultrasound systems face significant challenges in terms of power consumption and battery life. The core issue is that traditional ultrasound equipment relies on wired power supplies or bulky batteries, resulting in heavy, inconvenient devices with limited usage time on a single charge. This short battery life makes it difficult to meet the demands of extended operations in scenarios such as outdoor emergency care and remote medical settings. Furthermore, existing power management circuit designs suffer from low battery management efficiency and significant energy conversion losses, further limiting improvements in battery life.

[0004] Therefore, there is a current need for a laptop ultrasound system that can significantly reduce overall system power consumption and achieve ultra-long battery life while ensuring the quality of clinical diagnostic images. Existing technologies still require improvement and enhancement. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a portable ultrasound system with ultra-long battery life to solve the problem of short battery life of existing laptop ultrasound systems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A portable ultrasound system with ultra-long battery life includes a housing containing several functional modules. The housing also contains a power management board, a main battery, and a secondary battery. The power management board connects the main battery, the secondary battery, and each functional module. When the power management board detects the insertion of the adapter, it switches to adapter power supply and charges the main and auxiliary batteries; when detecting battery power supply, it automatically switches to the corresponding battery power supply according to the power level of the main and auxiliary batteries, and converts the first voltage during power supply into several other voltages to supply power to each functional module individually.

[0007] In the aforementioned portable ultrasound system with ultra-long battery life, the power management board integrates a main control circuit, a voltage output control circuit, and a battery management circuit; the main control circuit connects to the main battery, the auxiliary battery, the voltage output control circuit, and the battery management circuit; the voltage output control circuit connects to each functional module, and the battery management circuit connects to the main battery and the auxiliary battery; When the main control circuit detects the adapter being inserted, it outputs a power supply switch signal to the voltage output control circuit; when the adapter is removed, the battery management circuit detects the charge levels of the main and auxiliary batteries and controls the battery management circuit to automatically switch to the corresponding battery for power supply. The voltage output control circuit, based on the power supply switch signal, steps down the first voltage provided by the adapter to convert it into several second voltages to power each functional module individually; it also steps down the second voltage to a third voltage for power supply.

[0008] In the aforementioned portable ultrasound system with ultra-long battery life, the main control circuit includes a main control chip, a linear regulator, a button, a first resistor, a second resistor, and a first capacitor; The main control chip's ADC4 SDA pin is connected to the main battery, and its ADC5 SCL pin is connected to the auxiliary battery. The main control chip's ADC6, ADC7, and P3.7 CCP2 pins are all connected to the battery management circuit. The main control chip's VCC 3V3 pin is connected to the VOUT pin of the linear regulator. The linear regulator's VIN pin is connected to the external adapter's output pin DC_OUT. The linear regulator's GND pin is grounded. The main control chip's P3.6 ADC14 CCP1 pin is connected to the voltage output control circuit. The main control chip's P3.6 ADC13 pin is connected to a full charge indicator light. The main control chip's P3.4 ADC12 pin is connected to a charging indicator light. The main control chip's P3.3 INT1 pin is connected to one end of the first resistor and one end of the second resistor. The other end of the second resistor is connected to pin 1 of the button and ground. The other end of the first resistor is connected to the power input terminal. The main control chip's P3.2 INT0 pin is connected to pin 4 of the button and one end of the first capacitor. The button's pin 2 is connected to the other end of the first capacitor, pin 3 of the button, and pin 1 of the button.

[0009] In the aforementioned portable ultrasound system with ultra-long battery life, the main control circuit also includes a buzzer, a first switching transistor, a third resistor, a first inductor, and a second capacitor. The buzzer's pin 1 is connected to one end of the second capacitor and one end of the first inductor. The other end of the second capacitor is grounded, and the other end of the first inductor is input with a second voltage. The buzzer's pin 2 is connected to the collector of the first switching transistor. The emitter of the first switching transistor is grounded, and the base of the first switching transistor is connected to the P5.5 Beep pin of the main control chip through a third resistor.

[0010] In the aforementioned portable ultrasound system with ultra-long battery life, the main control circuit further includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third capacitor, and a fourth capacitor; One end of the fourth resistor is connected to the main battery, and the other end of the fourth resistor is connected to one end of the fifth resistor and one end of the sixth resistor. The other end of the fifth resistor is connected to one end of the third capacitor and the ADC4 SDA pin of the main control chip. The other end of the sixth resistor is connected to one end of the seventh resistor, the other end of the third capacitor, one end of the fourth capacitor, and ground. The other end of the seventh resistor is connected to one end of the eighth resistor and one end of the ninth resistor. The other end of the eighth resistor is connected to the auxiliary battery, and the other end of the ninth resistor is connected to the other end of the fourth capacitor and the ADC5 SCL pin of the main control chip.

[0011] In the aforementioned portable ultrasound system with ultra-long battery life, the voltage output control circuit includes a step-down unit, a voltage regulator, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, a first ferrite bead, a second ferrite bead, a fifth capacitor, a second inductor, and a tenth resistor. The voltage regulator's TG1 pin is connected to the gate of the second switching transistor, its BG1 pin is connected to the gate of the third switching transistor, its TG2 pin is connected to the gate of the fourth switching transistor, its BG2 pin is connected to the gate of the fifth switching transistor, and the drain of the second switching transistor is connected to the drain of the sixth switching transistor. The source of the sixth switching transistor is connected to the power input terminal, one end of the fifth capacitor, and one end of the tenth resistor. The gate of the sixth switching transistor is connected to the other end of the fifth capacitor, the other end of the tenth resistor, and the collector of the seventh switching transistor. The base of the seventh switching transistor is connected to the P3.6 ADC14 CCP1 pin of the main control chip, and the emitter of the seventh switching transistor is grounded. The source of the second switching transistor is connected to the drain of the third switching transistor and one end of the second inductor. The source of the third switching transistor is grounded. The drain of the fourth switching transistor is connected to the other end of the second inductor and the source of the fifth switching transistor. The drain of the fifth switching transistor is connected to one end of the first ferrite bead, one end of the second ferrite bead, and the step-down unit. The other end of the first ferrite bead is connected to the power supply terminal of the display, and the other end of the second ferrite bead is connected to the power supply terminal of the ultrasonic motherboard.

[0012] In the aforementioned portable ultrasound system with ultra-long battery life, the voltage output control circuit further includes a first diode, a second diode, an eleventh resistor, a twelfth resistor, a sixth capacitor, and a seventh capacitor; The anode of the first diode is connected to the source of the third switch and one end of the eleventh resistor. The cathode of the first diode is connected to the source of the second switch. The other end of the eleventh resistor is connected to one end of the sixth capacitor and ground. The other end of the sixth capacitor is connected to the drain of the second switch. The anode of the second diode is connected to the source of the fourth switch. The cathode of the second diode is connected to the drain of the fifth switch, one end of the seventh capacitor, and one end of the twelfth resistor. The other end of the seventh capacitor is grounded. The other end of the twelfth resistor is connected to one end of the first ferrite bead and one end of the second ferrite bead.

[0013] In the aforementioned portable ultrasound system with ultra-long battery life, the battery management circuit includes a first charging control chip, a second charging control chip, an eighth switching transistor, a ninth switching transistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, and a switching control unit. The CSSP pin of the first charging control chip is connected to one end of the thirteenth resistor and the power input terminal; the CSSN pin of the first charging control chip is connected to the other end of the thirteenth resistor and the drain of the eighth switching transistor; the EXT pin of the first charging control chip is connected to the gate of the eighth switching transistor; the CSB pin of the first charging control chip is connected to the source of the eighth switching transistor and one end of the fourteenth resistor; the BATT pin of the first charging control chip is connected to the other end of the fourteenth resistor, the switching control unit, and the main battery; the VL pin of the first charging control chip is connected to the ADC6 pin of the main control chip. The CSSP pin of the second charging control chip is connected to one end of the sixteenth resistor and the power input terminal; the CSSN pin of the second charging control chip is connected to the other end of the sixteenth resistor and the drain of the ninth switching transistor; the EXT pin of the second charging control chip is connected to the gate of the ninth switching transistor; the CSB pin of the second charging control chip is connected to the source of the ninth switching transistor and one end of the fifteenth resistor; the BATT pin of the second charging control chip is connected to the other end of the fifteenth resistor, the switching control unit, and the secondary battery; the VL pin of the second charging control chip is connected to the ADC7 pin of the main control chip.

[0014] In the aforementioned portable ultrasound system with ultra-long battery life, the switching control unit includes a relay, a tenth switch, an eleventh switch, a twelfth switch, a third diode, a fourth diode, a fifth diode, a third inductor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a seventeenth resistor, and an eighteenth resistor. The relay's pin 1 is connected to the main battery and the other end of the fourteenth resistor; pin 2 is connected to the secondary battery and the other end of the fifteenth resistor; pin 3 is connected to the drain of the tenth switching transistor and one end of the eighth capacitor; the source of the tenth switching transistor is connected to the cathode of the third diode, the cathode of the fourth diode, and one end of the tenth capacitor; the anode of the third diode is connected to the anode of the fourth diode and the power input terminal; the gate of the tenth switching transistor is connected to one end of the seventeenth resistor and one end of the tenth capacitor; the other end of the tenth capacitor is connected to the other end of the seventeenth resistor, the other end of the eighth capacitor, the other end of the ninth capacitor, and ground; pin 4 is connected to one end of the ninth capacitor, one end of the third inductor, and the cathode of the fifth diode; the other end of the third inductor is connected to the drain of the fifth switching transistor; pin 5 is connected to the anode of the fifth diode, one end of the eighteenth resistor, and the drain of the eleventh switching transistor; the other end of the eighteenth resistor is connected to the collector of the twelfth switching transistor and the gate of the eleventh switching transistor; the source of the eleventh switching transistor is connected to the emitter of the twelfth switching transistor and ground; the base of the twelfth switching transistor is connected to pin P3.7 CCP2 of the main control chip.

[0015] In the aforementioned portable ultrasound system with ultra-long battery life, the battery management circuit further includes a fourth inductor, a fifth inductor, a sixth diode, a seventh diode, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, and a fourteenth capacitor. The fourth inductor is connected between the source of the eighth switch and one end of the fourteenth resistor; the fifth inductor is connected between the source of the ninth switch and one end of the fifteenth resistor; the anode of the sixth diode is connected to the power input terminal; the cathode of the sixth diode is connected to one end of the thirteenth resistor and one end of the eleventh capacitor; one end of the twelfth capacitor is connected to the drain of the eighth switch; the other end of the eleventh capacitor is connected to the other end of the twelfth capacitor and ground; the anode of the seventh diode is connected to the power input terminal; the cathode of the seventh diode is connected to one end of the sixteenth resistor and one end of the fourteenth capacitor; one end of the thirteenth capacitor is connected to the drain of the eighth switch; and the other end of the fourteenth capacitor is connected to the other end of the thirteenth capacitor and ground.

[0016] Compared to existing technologies, the portable ultrasound system with ultra-long battery life provided by this invention includes a housing containing several functional modules, a power management board, a main battery, and a secondary battery. The power management board connects the main battery, the secondary battery, and each functional module. When the power management board detects an adapter insertion, it switches to adapter power supply and charges both the main and secondary batteries. When detecting battery power supply, it automatically switches to the corresponding battery power supply based on the battery levels of the main and secondary batteries, converting the initial voltage during power supply into several other voltages to individually power each functional module. Independent power supply to each functional module achieves hierarchical and zoned power control. With a main and secondary battery and three power supply modes, it can automatically switch between power supply modes, significantly extending battery life and solving the problem of short battery life in existing laptop ultrasound systems. Attached Figure Description

[0017] Figure 1 This is a structural block diagram of the portable ultrasound system with ultra-long battery life provided by the present invention.

[0018] Figure 2 This is a circuit diagram of the main control circuit provided by the present invention.

[0019] Figure 3 This is a circuit diagram of the voltage output control circuit provided by the present invention.

[0020] Figure 4 This is a circuit diagram of the battery management circuit provided by the present invention. Detailed Implementation

[0021] This invention provides a portable ultrasound system with ultra-long battery life. To make the objectives, technical solutions, and advantages of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0022] Please also refer to Figures 1 to 4 The present invention provides a portable ultrasound system with ultra-long battery life, comprising a housing, wherein a power management board 10, a main battery, a secondary battery, and several functional modules are disposed within the housing; the power management board 10 is connected to the main battery, the secondary battery, and each functional module; when the power management board 10 detects that the adapter is inserted, it switches to adapter power supply and charges the main and secondary batteries; when it detects that the battery is powered (adapter is unplugged), it automatically switches to the corresponding battery power supply according to the charge level of the main and secondary batteries, and converts the first voltage during power supply into several other voltages to supply power to each functional module individually.

[0023] In this embodiment, the main and auxiliary batteries are preferably lithium-ion batteries; both main and auxiliary batteries can serve as DC-IN (direct current input), and the battery input can replace the adapter to achieve 12V output. Several functional modules include, but are not limited to, an ultrasonic motherboard, a keypad, a display, and a cooling fan. The display is a low-power display, connected to the ultrasonic motherboard via an LVDS signal line; the ultrasonic motherboard and the keypad communicate via a serial port. The screen brightness can be manually adjusted to a comfortable and energy-saving level according to the ambient light intensity. Specifically, this is achieved through the brightness adjustment function on the software interface, manually adjusting the knob on the keypad to send an adjustment signal to the ultrasonic motherboard. After receiving the signal, the ultrasonic motherboard adjusts the display's PWM signal, thereby adjusting the display brightness and optimizing the display system's power consumption. A cooling fan connected to the power management board is installed inside the portable ultrasonic system to conduct internal heat to the device casing for dissipation, preventing the internal temperature from exceeding 40°C. In practical implementation, if the structure of the portable ultrasound system prevents the main and auxiliary batteries from being directly connected to the power management board, a battery connection board can be set up as an intermediate transfer. The corresponding power pins on the power management board 10 are led out to connect to the input terminal of the battery connection board, and the output terminal of the battery connection board is connected to the positive terminal of the main and auxiliary batteries.

[0024] The power management board 10 integrates a main control circuit 110, a voltage output control circuit 120, and a battery management circuit 130. The main control circuit 110 is connected to the main battery, the auxiliary battery, the voltage output control circuit 120, and the battery management circuit 130. The voltage output control circuit 120 is connected to each functional module, and the battery management circuit 130 is connected to the main battery and the auxiliary battery.

[0025] When the main control circuit 110 detects the adapter being inserted, it outputs a power supply switch signal to the voltage output control circuit 120; when the adapter is removed, it detects the power levels of the main and auxiliary batteries through the battery management circuit 130 and controls the battery management circuit 130 to automatically switch to the corresponding battery for power supply; the voltage output control circuit 120, according to the power supply switch signal, steps down the first voltage provided by the adapter to convert it into several second voltages +12V, which power each functional module individually; it also steps down the second voltage +12V to a third voltage +5V for power supply.

[0026] Please continue to participate. Figure 2 The main control circuit 110 includes a main control chip U1, a linear regulator U2, a button K, a first resistor R1, a second resistor R2, and a first capacitor C1. The ADC4 SDA pin of the main control chip U1 is connected to the main battery, and the ADC5 SCL pin of the main control chip U1 is connected to the auxiliary battery. The ADC6, ADC7, and P3.7 CCP2 pins of the main control chip U1 are all connected to the battery management circuit. The VCC 3V3 pin of the main control chip U1 is connected to the VOUT pin of the linear regulator U2. The VIN pin of the linear regulator U2 is connected to the output pin DC_OUT of the external adapter (i.e., the power input terminal, providing the first voltage +19V). The GND pin of the linear regulator U2 is grounded. The P3.6 ADC14 CCP1 pin of the main control chip U1 is connected to the voltage output control circuit. The P3.6 ADC13 pin of the main control chip U1 is externally connected (in specific implementation, through a 2K resistor) to a fully charged indicator light. The P3.4 pin of the main control chip U1... An external charging indicator light is connected to pin 12 of the ADC (in practice, this is done via a 3K resistor). Pin P3.3 INT1 of the main control chip U1 is connected to one end of the first resistor R1 and one end of the second resistor R2. The other end of the second resistor R2 is connected to pin 1 of button K and ground. The other end of the first resistor R1 is connected to the power input terminal. Pin P3.2 INT0 of the main control chip U1 is connected to pin 4 of button K and one end of the first capacitor C1. Pin 2 of button K is connected to the other end of the first capacitor C1, pin 3 of button K, and pin 1 of button K.

[0027] The adapter provides a first voltage of +19V, which is converted into a stable chip voltage of +3.3V by a linear regulator U2 to power the main control chip U1. In practice, several capacitors can be grounded between the VOUT pin of the linear regulator U2 and the VCC3V3 pin of the main control chip U1 to filter and stabilize the voltage. The first voltage of +19V is then safely transmitted to the main control chip U1 after being divided by R1 (100KΩ) and R2 (18KΩ) (to prevent the high voltage of 19V from burning out the main control chip, which has a voltage limit of 3.3V). The main control chip U1 then detects that the adapter has been inserted.

[0028] The button K is used for power on / off control. Pressing and holding it for more than 2 seconds sends a low-level trigger signal to the P3.2 INT0 pin of the main control chip U1 each time it is pressed. The main control chip U1 detects the power-off state and performs a power-on operation, and vice versa, achieving a soft start. The first capacitor C1 is a debouncing capacitor, used to absorb the jitter pulses generated by the mechanical jitter of the button K being pressed. Preferably, a pull-up resistor can also be provided, with one end connected to the P3.2 INT0 pin of the main control chip U1 and the other end connected to the VOUT pin (input chip voltage + 3.3MCU) of the linear regulator U2, pulling the P3.2 INT0 pin of the main control chip U1 high to prevent false triggering caused by the pin being floating when the button K is not pressed.

[0029] The main control chip U1 is preferably an STC8G1K08, which integrates power management, power supply control, and soft-start functions. U1 continuously monitors the power levels of the main and auxiliary batteries through ADC4 SDA and ADC5 SCL pins; it monitors the charging status of the main and auxiliary batteries through ADC6 and ADC7 pins respectively. When charging, the charging indicator light is controlled to illuminate through P3.4 ADC12 pin; when fully charged, the fully charged indicator light is controlled to illuminate through P3.6 ADC13 pin. U1 also detects when an adapter is connected via pin P3.3 INT1 and automatically switches to adapter power first. In battery power mode (where the main and auxiliary batteries can provide a battery voltage of +10V to +16.8V), it prioritizes using the main battery. When there is no external adapter and the main battery is low enough to provide a voltage output above +10V, it outputs a battery switching control signal (in specific implementation, pin P3.7 CCP2 can also be grounded through a 5.1K resistor to pull down the pin and prevent false triggering due to floating) to the battery management circuit 130, thus achieving seamless switching to auxiliary battery power.

[0030] Preferably, the main control circuit 110 further includes a buzzer BZ, a first switching transistor Q1, a third resistor R3, a first inductor L1, and a second capacitor C2; pin 1 of the buzzer BZ is connected to one end of the second capacitor C2 and one end of the first inductor L1, the other end of the second capacitor C2 is grounded, the other end of the first inductor L1 is input with a third voltage +5V (provided by the voltage output control circuit 120), pin 2 of the buzzer BZ is connected to the collector of the first switching transistor Q1, the emitter of the first switching transistor Q1 is grounded, and the base of the first switching transistor Q1 is connected to the P5.5 Beep pin of the main control chip U1 through the third resistor R3.

[0031] The first switching transistor Q1 is an NPN transistor. During soft-start or power-off, the main control chip U1 controls the buzzer BZ to emit a buzzing sound as an alarm. The P5.5 Beep pin of the main control chip U1 outputs a high level to control Q1 to conduct, grounding pin 2 of the buzzer BZ and forming a current loop with the +5V voltage on pin 1, thus driving the buzzer BZ to sound. R3 is used for current limiting to protect Q1, and C2 and L1 are used to filter out high-frequency electromagnetic interference generated when BZ is working.

[0032] Preferably, the main control circuit 110 further includes a fourth resistor R4 (preferably 43KΩ), a fifth resistor R5 (20KΩ), a sixth resistor R6 (10KΩ), a seventh resistor R7 (10KΩ), an eighth resistor R8 (43KΩ), a ninth resistor R9 (20KΩ), a third capacitor C3, and a fourth capacitor C4; one end of the fourth resistor R4 is connected to the main battery, and the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, and the other end of the fifth resistor R5 is connected to one end of the third capacitor C3 and the ADC4 SDA pin of the main control chip U1; the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7, the other end of the third capacitor C3, one end of the fourth capacitor C4, and ground; the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8 and one end of the ninth resistor R9, the other end of the eighth resistor R8 is connected to the auxiliary battery, and the other end of the ninth resistor R9 is connected to the other end of the fourth capacitor C4 and the ADC5 SCL pin of the main control chip U1.

[0033] Since the voltages of the main and auxiliary batteries are typically high, R4, R5, R6, and C3 form a voltage filtering network to proportionally reduce the main battery voltage, filter out high-frequency noise, and then transmit the voltage to the main control chip, allowing the current charge level of the main battery to be read. R7, R8, R9, and C4 form another voltage filtering network to proportionally reduce the auxiliary battery voltage, filter out noise, and then transmit the voltage to the main control chip, allowing the current charge level of the auxiliary battery to be read.

[0034] In practical implementation, to protect the seventh switch Q7, it is also possible to... Figure 3 As shown, two resistors and one capacitor are set at the base of Q7 to limit current and filter it.

[0035] Please continue to participate. Figure 3The voltage output control circuit 120 includes a step-down unit 121, a voltage regulator U3, a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, a first ferrite bead FB1, a second ferrite bead FB2, a fifth capacitor C5, a second inductor L2, and a tenth resistor R10. The TG1 pin of the voltage regulator U3 is connected to the gate of the second switch Q2, and the BG1 pin of the voltage regulator U3 is connected to the gate of the third switch Q3. Pin TG2 is connected to the gate of the fourth switching transistor Q4; pin BG2 of the voltage regulator controller U3 is connected to the gate of the fifth switching transistor Q5; the drain of the second switching transistor Q2 is connected to the drain of the sixth switching transistor Q6; the source of the sixth switching transistor Q6 is connected to the power input terminal, one end of the fifth capacitor C5, and one end of the tenth resistor R10; the gate of the sixth switching transistor Q6 is connected to the other end of the fifth capacitor C5, the other end of the tenth resistor R10, and the collector of the seventh switching transistor Q7; the base of the seventh switching transistor Q7 is connected to pin P3.6ADC14 of the main control chip U1. Pin CCP1 is connected to the emitter of the seventh switch Q7, which is grounded. The source of the second switch Q2 is connected to the drain of the third switch Q3 and one end of the second inductor L2. The source of the third switch Q3 is grounded. The drain of the fourth switch Q4 is connected to the other end of the second inductor L2 and the source of the fifth switch Q5. The drain of the fifth switch Q5 is connected to one end of the first ferrite bead FB1, one end of the second ferrite bead FB2, and the input of the step-down unit 121. The other end of the first ferrite bead FB1 is connected to the power supply of the display, and the other end of the second ferrite bead FB2 is connected to the power supply of the ultrasonic motherboard.

[0036] In this circuit, the second to fifth switching transistors Q2 to Q5 are preferably SIR814 N-channel enhancement-mode power MOSFETs (NMOS transistors), the sixth switching transistor Q6 is preferably an SI4459 PMOS transistor, and the seventh switching transistor Q7 is preferably an NPN transistor. The voltage regulator U3 is preferably an LTC3789 synchronous buck-boost switching regulator. Pin TG1 of U3 transmits the buck-boost control switch signal, pins BG1 and TG2 of U3 transmit feedback control switch signals (specifically, pin BG1 is the feedback control switch, and pin TG2 is the output control switch), and pin BG2 of U3 transmits the output control switch signal. This controls the connected switching transistors, adjusts the voltage output based on voltage feedback, and outputs a stable second voltage of +12V to power the display and ultrasonic mainboard. The second voltage of +12V is also output as a third voltage of +5V after synchronous bucking and DC-DC conversion by the buck converter 121.

[0037] When the power supply switch signal is valid (e.g., high level), Q7 conducts and grounds, pulling the gate of Q6 down to ground. Q6 then conducts, transmitting the first voltage +19V to the subsequent stage Q2. When power off or power supply needs to be stopped, the power supply switch signal is invalid (e.g., low level), Q7 is cut off, and the gate of Q6 is pulled up to a high level through C5 and R10. When Q6 is cut off, the first voltage +19V stops outputting.

[0038] The voltage regulator controller U3, in conjunction with four external NMOS transistors, forms a four-switch Buck-Boost converter. When the input first voltage of +19V fluctuates significantly (above, below, or equal to 12V), it can automatically perform buck, boost, or voltage regulation by controlling the on / off sequence and duty cycle of the corresponding NMOS transistors via pins TG1, BG1, TG2, and BG2, consistently maintaining the two output voltages precisely stable at 12V. Specifically, Q2 and Q3 form a buck converter; Q2 acts as the main switch, controlling the chopping of the first +19V voltage through its on / off control; Q3 acts as a synchronous rectifier, conducting when Q2 is off, providing a freewheeling circuit. Q4 and Q5 form a boost converter; Q5 also acts as the main switch, controlling the energy storage and release of the second inductor L2 through its on / off control; Q4 has the same function as Q3.

[0039] This converter provides an independent, controllable, and clean power supply for multiple modules of the device (main board, keypad, display screen). This embodiment mainly shows the output of a second voltage of +12V to the display and the ultrasonic main board. If power is needed to supply other modules, a ferrite bead connection can be added.

[0040] Furthermore, the voltage regulator U3 can dynamically respond to changes in the power demand of the ultrasonic motherboard under different operating modes (such as harmonic imaging mode, fundamental wave imaging mode, and M mode). When the ultrasonic motherboard requests a change in the core output voltage via an internal signal, the converter adjusts its output current and power in real time through a closed-loop feedback mechanism, ensuring rapid recovery of stability when the output voltage may fluctuate due to load transients. That is, the output voltage is precisely stabilized at +12V, but the output current will vary according to the different operating voltage requirements of the ultrasonic motherboard, resulting in different output power. A buck-boost circuit (composed of an LT3958 chip and its peripheral circuitry) is provided at the voltage input terminal of the ultrasonic motherboard. In different operating modes, the ultrasonic motherboard provides feedback signals to the buck-boost circuit, which in turn provides feedback signals to the power management board. The power management board outputs the corresponding operating power, and the buck-boost circuit can also adjust the voltage according to the current power. This provides support for the ultrasonic motherboard to smoothly adjust its operating voltage and power consumption, ensuring the performance and reliability of the equipment under various operating conditions.

[0041] The step-down unit 121 includes a third ferrite bead FB3, a step-down converter U6, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, and a fifteenth capacitor C15. The IN pin of the step-down converter U6 is connected to the drain of the fifth switching transistor Q5 through the third ferrite bead FB3. The OUT pin of the step-down converter U6 provides a third voltage of +5V and is connected to one end of the nineteenth resistor R19 and one end of the fifteenth capacitor C15. The FB pin of the step-down converter U6 is connected to the other end of the nineteenth resistor R19, the other end of the fifteenth capacitor C15, one end of the twentieth resistor R20, and one end of the twenty-first resistor R21. The other ends of the twentieth resistor R20 and the twenty-first resistor R21 are both grounded.

[0042] The preferred buck converter U6 is a synchronous buck DC-DC converter, model MPQ6300GQV-Z, which steps down and regulates the second voltage (+12V) to output a third DC voltage (+5V). R19, R20, and R21 form a feedback network for the third voltage (+5V), which samples and feeds the +5V voltage back to U6. Internal adjustments within U6 ensure the output voltage remains stable at +5V. C15 is a bypass capacitor used to filter and reduce noise in the +5V voltage, ensuring its smoothness.

[0043] Preferably, the voltage output control circuit 120 further includes a first diode D1, a second diode D2, an eleventh resistor R11, a twelfth resistor R12, a sixth capacitor C6, and a seventh capacitor C7; the anode of the first diode D1 is connected to the source of the third switch Q3 and one end of the eleventh resistor R11, the cathode of the first diode D1 is connected to the source of the second switch Q2, the other end of the eleventh resistor R11 is connected to one end of the sixth capacitor C6 and ground, the other end of the sixth capacitor C6 is connected to the drain of the second switch Q2, the anode of the second diode D2 is connected to the source of the fourth switch Q4; the cathode of the second diode D2 is connected to the drain of the fifth switch Q5, one end of the seventh capacitor C7, and one end of the twelfth resistor R12; the other end of the seventh capacitor C7 is grounded, and the other end of the twelfth resistor R12 is connected to one end of the first ferrite bead FB1 and one end of the second ferrite bead FB2.

[0044] Among them, the first diode D1 and the second diode D2 are Schottky diodes, used for dead-time protection to prevent the two MOSFETs in one group from conducting simultaneously and causing a short circuit; they also serve as auxiliary rectification to ensure stable circuit startup. C6 and R11 form the RC filter network at the input of the converter, and R12 and C7 form the RC filter network at the output of the converter, both of which smooth the voltage.

[0045] Please continue reading. Figure 4The battery management circuit 130 includes a first charging control chip U4, a second charging control chip U5, an eighth switch Q8, a ninth switch Q9, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, and a switching control unit 131. The CSSP pin of the first charging control chip U4 is connected to one end of the thirteenth resistor R13 and the power input terminal; the CSSN pin of the first charging control chip U4 is connected to the other end of the thirteenth resistor R13 and the drain of the eighth switch Q8; the EXT pin of the first charging control chip U4 is connected to the gate of the eighth switch Q8; the CSB pin of the first charging control chip U4 is connected to the source of the eighth switch Q8 and one end of the fourteenth resistor R14; and the BATT pin of the first charging control chip U4 is connected to the fourteenth resistor R15. The other end of 4 connects to the switching control unit 131 and the main battery; the VL pin of the first charging control chip U4 is connected to the ADC6 pin of the main control chip U1; the CSSP pin of the second charging control chip U5 is connected to one end of the sixteenth resistor R16 and the power input terminal; the CSSN pin of the second charging control chip U5 is connected to the other end of the sixteenth resistor R16 and the drain of the ninth switch Q9; the EXT pin of the second charging control chip U5 is connected to the gate of the ninth switch Q9; the CSB pin of the second charging control chip U5 is connected to the source of the ninth switch Q9 and one end of the fifteenth resistor R15; the BATT pin of the second charging control chip U5 is connected to the other end of the fifteenth resistor R15, the switching control unit 131 and the auxiliary battery; the VL pin of the second charging control chip U5 is connected to the ADC7 pin of the main control chip U1.

[0046] The eighth switch Q8 and the ninth switch Q9 are preferably SI4459 PMOS transistors. The two charging control chips are preferably MAX1873T, which features a dual-path independent Buck architecture and enables synchronous fast charging of the main and auxiliary batteries; in terms of discharge logic, a main battery priority power supply strategy is adopted. The first charging control chip U4 is used for charging control of the main battery, and the second charging control chip U5 is used for charging control of the auxiliary battery. The first voltage +19V input provides charging power to the two charging control chips. The EXT pins of the two charging control chips control the on / off state of Q8 and Q9 to achieve constant current and constant voltage charging functions for the main and auxiliary batteries. During charging, the input current is sampled by detecting the voltage difference across R13 and R16. The on / off control of Q8 and Q9 is adjusted according to the magnitude of the input current to avoid burning out downstream devices. The charging current is sampled by detecting the voltage difference across R14 and R15, and the actual charging current entering the battery is fed back to the two charging control chips to adjust the on / off state of Q8 and Q9 to achieve constant voltage and constant current charging. The VL pins of the two charging control chips output charging status detection signals 1 and 2 of the main and auxiliary batteries to the main control chip U1, respectively. The main control chip U1 can then determine the current charging status and light up the corresponding charging indicator or full charge indicator.

[0047] The switching control unit 131 includes a relay KJ, a tenth switch Q10, an eleventh switch Q11, a twelfth switch Q12, a third diode D3, a fourth diode D4, a fifth diode D5, a third inductor L3, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a seventeenth resistor R17, and an eighteenth resistor R18. The first pin (normally closed) of the relay KJ is connected to the main battery and the other end of the fourteenth resistor R14; the second pin (normally open) of the relay KJ is connected to the secondary battery and the other end of the fifteenth resistor R15; the third pin (common terminal) of the relay KJ is connected to the drain of the tenth switch Q10 and one end of the eighth capacitor C8; the source of the tenth switch Q10 is connected to the cathode of the third diode D3, the cathode of the fourth diode D4, and one end of the tenth capacitor C10; the anode of the third diode D3 is connected to the anode of the fourth diode and the power input terminal; and the gate of the tenth switch Q10... Connect one end of the seventeenth resistor R17 to one end of the tenth capacitor C10; connect the other end of the tenth capacitor C10 to the other end of the seventeenth resistor R17, the other end of the eighth capacitor C8, the other end of the ninth capacitor C9, and ground; connect pin 4 (one end of the coil) of relay KJ to one end of the ninth capacitor C9, one end of the third inductor L3, and the negative terminal of the fifth diode D5; connect the other end of the third inductor L3 to the drain of the fifth switching transistor Q5 (providing +12V); connect pin 5 (the other end of the coil) of relay KJ to the positive terminal of the fifth diode D5, one end of the eighteenth resistor R18, and the drain of the eleventh switching transistor Q11; connect the other end of the eighteenth resistor R18 to the collector of the twelfth switching transistor Q12 and the gate of the eleventh switching transistor Q11; connect the source of the eleventh switching transistor Q11 to the emitter of the twelfth switching transistor Q12 and ground; connect the base of the twelfth switching transistor Q12 to pin P3.7 CCP2 of the main control chip U1.

[0048] Specifically, the tenth switch Q10 is preferably an SI4459 NMOS transistor, the eleventh switch Q11 is preferably an NP340 NMOS transistor, and the twelfth switch Q12 is preferably a C945 NPN transistor. The switching control unit 131 establishes a redundant switching mechanism with the relays through a voltage monitoring network. The voltage monitoring is performed by… Figure 2Pins 3 and 4 of the main control chip U1 are connected to a voltage divider resistor (63K). Each of the main and auxiliary batteries has a power detection signal line connected to the power management board: main battery, R4, R5 to U1's ADC4 SDA pin; auxiliary battery, R8, R9 to U1's ADC5 SCL pin. The 63K step-down resistor is connected to U1, and voltage change signals are received and processed by U1. Pin 14 of U1 is the adapter detection signal pin, and pin 18 is the battery switching signal pin. The adapter has a +19V input, with a parallel 19V input line connected to pin 14 of U1 via a 100K resistor R1. Voltage signals are transmitted when the adapter is connected. Pin 5 of relay KJ drives Q11 via Q12 and is connected to pin 18 of U1. When the main battery voltage is detected to be below the 11V threshold, the battery switching control signal seamlessly switches the load to the auxiliary battery for power supply. The bus capacitor is used to maintain voltage transient stability, thereby achieving a balance between dual-path charging acceleration and main / backup redundant power supply, taking into account both charging efficiency and system power supply continuity.

[0049] Preferably, the battery management circuit 130 further includes a fourth inductor L4, a fifth inductor L5, a sixth diode D6, a seventh diode D7, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, and a fourteenth capacitor C14; the fourth inductor L4 is connected between the source of the eighth switch Q8 and one end of the fourteenth resistor R14, the fifth inductor L5 is connected between the source of the ninth switch Q9 and one end of the fifteenth resistor R15, the anode of the sixth diode D6 is connected to the power input terminal, and the cathode of the sixth diode D6 is connected to... One end of the thirteenth resistor R13 is connected to one end of the eleventh capacitor C11. One end of the twelfth capacitor C12 is connected to the drain of the eighth switching transistor Q8. The other end of the eleventh capacitor C11 is connected to the other end of the twelfth capacitor C12 and ground. The positive terminal of the seventh diode D7 is connected to the power input terminal. The negative terminal of the seventh diode D7 is connected to one end of the sixteenth resistor R16 and one end of the fourteenth capacitor C14. One end of the thirteenth capacitor C13 is connected to the drain of the eighth switching transistor Q8. The other end of the fourteenth capacitor C14 is connected to the other end of the thirteenth capacitor C13 and ground.

[0050] Among them, the sixth diode D6 and the seventh diode D7 are preferably SS34 type, used to prevent the first voltage +19V from being reverse-connected. C11, R13 and C12, C13, R16 and C14 respectively form two sets of Π-type filter networks, used to filter the first voltage +19V, making the charging more stable. L4 and L5 are used for energy storage and release.

[0051] The resistors and capacitors connected to the other pins of the first charging control chip U4 and the second charging control chip U5 are the peripheral circuits of the chips, which is existing technology.

[0052] In summary, this invention discloses a portable ultrasound system with ultra-long battery life. A power management board provides independent and controllable power supply tracks for each functional module within the system, such as the ultrasound motherboard, button board, and display. Under multiple preset operating modes, a load switch dynamically adjusts the upper limit of the power supply voltage and current to each functional module, achieving hierarchical and zoned power management. It also integrates main and auxiliary batteries, preferentially switching to power supply from the adapter when it is inserted, and automatically switching between the main and auxiliary batteries based on their charge levels when the adapter is removed, achieving seamless power supply and heterogeneous power management. With the same battery capacity, the main and auxiliary battery power switching design extends the battery life from 3 hours with a single battery to 8 hours with dual batteries, meeting all-weather operation requirements and far exceeding the continuous working time of existing products on a single charge. The overall weight is controlled below 3.5kg, 40% lighter than traditional equipment. Through modular design, the cost of the basic version is reduced by 25%, while also supporting functional expansion.

[0053] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A portable ultrasonic system with ultra-long battery life, comprising a housing, wherein the housing contains a plurality of functional modules, characterized in that, The housing also contains a power management board, a main battery, and a secondary battery; the power management board connects the main battery, the secondary battery, and various functional modules. When the power management board detects the insertion of the adapter, it switches to adapter power supply and charges the main and auxiliary batteries; when detecting battery power supply, it automatically switches to the corresponding battery power supply according to the power level of the main and auxiliary batteries, and converts the first voltage during power supply into several other voltages to supply power to each functional module individually.

2. The portable ultrasound system with ultra-long battery life according to claim 1, characterized in that, The power management board integrates a main control circuit, a voltage output control circuit, and a battery management circuit; the main control circuit connects the main battery, the auxiliary battery, the voltage output control circuit, and the battery management circuit; the voltage output control circuit connects to each functional module, and the battery management circuit connects to the main battery and the auxiliary battery; When the main control circuit detects the adapter being inserted, it outputs a power supply switch signal to the voltage output control circuit; when the adapter is removed, the battery management circuit detects the charge levels of the main and auxiliary batteries and controls the battery management circuit to automatically switch to the corresponding battery for power supply. The voltage output control circuit, based on the power supply switch signal, steps down the first voltage provided by the adapter to convert it into several second voltages to power each functional module individually; it also steps down the second voltage to a third voltage for power supply.

3. The portable ultrasound system with ultra-long battery life according to claim 2, characterized in that, The main control circuit includes a main control chip, a linear regulator, a button, a first resistor, a second resistor, and a first capacitor; The main control chip's ADC4 SDA pin is connected to the main battery, and its ADC5 SCL pin is connected to the auxiliary battery. The main control chip's ADC6, ADC7, and P3.7 CCP2 pins are all connected to the battery management circuit. The main control chip's VCC 3V3 pin is connected to the VOUT pin of the linear regulator. The linear regulator's VIN pin is connected to the external adapter's output pin DC_OUT. The linear regulator's GND pin is grounded. The main control chip's P3.6 ADC14 CCP1 pin is connected to the voltage output control circuit. The main control chip's P3.6 ADC13 pin is connected to a full charge indicator light. The main control chip's P3.4 ADC12 pin is connected to a charging indicator light. The main control chip's P3.3 INT1 pin is connected to one end of the first resistor and one end of the second resistor. The other end of the second resistor is connected to pin 1 of the button and ground. The other end of the first resistor is connected to the power input terminal. The main control chip's P3.2 INT0 pin is connected to pin 4 of the button and one end of the first capacitor. The button's pin 2 is connected to the other end of the first capacitor, pin 3 of the button, and pin 1 of the button.

4. The portable ultrasound system with ultra-long battery life according to claim 3, characterized in that, The main control circuit also includes a buzzer, a first switching transistor, a third resistor, a first inductor, and a second capacitor; The buzzer's pin 1 is connected to one end of the second capacitor and one end of the first inductor. The other end of the second capacitor is grounded, and the other end of the first inductor is input with a second voltage. The buzzer's pin 2 is connected to the collector of the first switching transistor. The emitter of the first switching transistor is grounded, and the base of the first switching transistor is connected to the P5.5 Beep pin of the main control chip through a third resistor.

5. The portable ultrasound system with ultra-long battery life according to claim 4, characterized in that, The main control circuit also includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third capacitor, and a fourth capacitor; One end of the fourth resistor is connected to the main battery, and the other end of the fourth resistor is connected to one end of the fifth resistor and one end of the sixth resistor. The other end of the fifth resistor is connected to one end of the third capacitor and the ADC4 SDA pin of the main control chip. The other end of the sixth resistor is connected to one end of the seventh resistor, the other end of the third capacitor, one end of the fourth capacitor, and ground. The other end of the seventh resistor is connected to one end of the eighth resistor and one end of the ninth resistor. The other end of the eighth resistor is connected to the auxiliary battery, and the other end of the ninth resistor is connected to the other end of the fourth capacitor and the ADC5 SCL pin of the main control chip.

6. The portable ultrasound system with ultra-long battery life according to claim 4, characterized in that, The voltage output control circuit includes a step-down unit, a voltage regulator controller, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, a first ferrite bead, a second ferrite bead, a fifth capacitor, a second inductor, and a tenth resistor; The voltage regulator's TG1 pin is connected to the gate of the second switching transistor, the voltage regulator's BG1 pin is connected to the gate of the third switching transistor, the voltage regulator's TG2 pin is connected to the gate of the fourth switching transistor, the voltage regulator's BG2 pin is connected to the gate of the fifth switching transistor, and the drain of the second switching transistor is connected to the drain of the sixth switching transistor. The source of the sixth switch is connected to the power input terminal, one end of the fifth capacitor, and one end of the tenth resistor; the gate of the sixth switch is connected to the other end of the fifth capacitor, the other end of the tenth resistor, and the collector of the seventh switch; the base of the seventh switch is connected to pin P3.6 ADC14 CCP1 of the main control chip, and the emitter of the seventh switch is grounded; the source of the second switch is connected to the drain of the third switch and one end of the second inductor; the source of the third switch is grounded; and the drain of the fourth switch is connected to the other end of the second inductor and the source of the fifth switch. The drain of the fifth switching transistor is connected to one end of the first magnetic bead, one end of the second magnetic bead, and the step-down unit; the other end of the first magnetic bead is connected to the power supply terminal of the display, and the other end of the second magnetic bead is connected to the power supply terminal of the ultrasonic motherboard.

7. The portable ultrasound system with ultra-long battery life according to claim 6, characterized in that, The voltage output control circuit also includes a first diode, a second diode, an eleventh resistor, a twelfth resistor, a sixth capacitor, and a seventh capacitor; The anode of the first diode is connected to the source of the third switch and one end of the eleventh resistor. The cathode of the first diode is connected to the source of the second switch. The other end of the eleventh resistor is connected to one end of the sixth capacitor and ground. The other end of the sixth capacitor is connected to the drain of the second switch. The anode of the second diode is connected to the source of the fourth switch. The negative terminal of the second diode is connected to the drain of the fifth switching transistor, one end of the seventh capacitor, and one end of the twelfth resistor; the other end of the seventh capacitor is grounded, and the other end of the twelfth resistor is connected to one end of the first ferrite bead and one end of the second ferrite bead.

8. The portable ultrasound system with ultra-long battery life according to claim 7, characterized in that, The battery management circuit includes a first charging control chip, a second charging control chip, an eighth switch, a ninth switch, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, and a switching control unit; The CSSP pin of the first charging control chip is connected to one end of the thirteenth resistor and the power input terminal; the CSSN pin of the first charging control chip is connected to the other end of the thirteenth resistor and the drain of the eighth switching transistor; the EXT pin of the first charging control chip is connected to the gate of the eighth switching transistor; the CSB pin of the first charging control chip is connected to the source of the eighth switching transistor and one end of the fourteenth resistor; the BATT pin of the first charging control chip is connected to the other end of the fourteenth resistor, the switching control unit, and the main battery. The VL pin of the first charging control chip is connected to the ADC6 pin of the main control chip. The CSSP pin of the second charging control chip is connected to one end of the sixteenth resistor and the power input terminal. The CSSN pin of the second charging control chip is connected to the other end of the sixteenth resistor and the drain of the ninth switching transistor. The EXT pin of the second charging control chip is connected to the gate of the ninth switching transistor. The CSB pin of the second charging control chip is connected to the source of the ninth switching transistor and one end of the fifteenth resistor. The BATT pin of the second charging control chip is connected to the other end of the fifteenth resistor, switching control unit and auxiliary battery; The VL pin of the second charging control chip is connected to the ADC7 pin of the main control chip.

9. The portable ultrasound system with ultra-long battery life according to claim 8, characterized in that, The switching control unit includes a relay, a tenth switch, an eleventh switch, a twelfth switch, a third diode, a fourth diode, a fifth diode, a third inductor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a seventeenth resistor, and an eighteenth resistor; The relay's pin 1 is connected to the main battery and the other end of the fourteenth resistor; pin 2 is connected to the secondary battery and the other end of the fifteenth resistor; pin 3 is connected to the drain of the tenth switching transistor and one end of the eighth capacitor; the source of the tenth switching transistor is connected to the cathode of the third diode, the cathode of the fourth diode, and one end of the tenth capacitor; the anode of the third diode is connected to the anode of the fourth diode and the power input terminal; the gate of the tenth switching transistor is connected to one end of the seventeenth resistor and one end of the tenth capacitor; the other end of the tenth capacitor is connected to the other end of the seventeenth resistor, the other end of the eighth capacitor, the other end of the ninth capacitor, and ground; pin 4 is connected to one end of the ninth capacitor, one end of the third inductor, and the cathode of the fifth diode; the other end of the third inductor is connected to the drain of the fifth switching transistor; pin 5 is connected to the anode of the fifth diode, one end of the eighteenth resistor, and the drain of the eleventh switching transistor; the other end of the eighteenth resistor is connected to the collector of the twelfth switching transistor and the gate of the eleventh switching transistor; the source of the eleventh switching transistor is connected to the emitter of the twelfth switching transistor and ground; the base of the twelfth switching transistor is connected to pin P3.7 CCP2 of the main control chip.

10. The portable ultrasound system with ultra-long battery life according to claim 8, characterized in that, The battery management circuit also includes a fourth inductor, a fifth inductor, a sixth diode, a seventh diode, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, and a fourteenth capacitor; The fourth inductor is connected between the source of the eighth switch and one end of the fourteenth resistor; the fifth inductor is connected between the source of the ninth switch and one end of the fifteenth resistor; the anode of the sixth diode is connected to the power input terminal; the cathode of the sixth diode is connected to one end of the thirteenth resistor and one end of the eleventh capacitor; one end of the twelfth capacitor is connected to the drain of the eighth switch; the other end of the eleventh capacitor is connected to the other end of the twelfth capacitor and ground; the anode of the seventh diode is connected to the power input terminal; the cathode of the seventh diode is connected to one end of the sixteenth resistor and one end of the fourteenth capacitor; one end of the thirteenth capacitor is connected to the drain of the eighth switch; and the other end of the fourteenth capacitor is connected to the other end of the thirteenth capacitor and ground.

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