Double-battery-pack power supply system for medical equipment and medical equipment

Abstract

The invention relates to a double-battery-pack power supply system for medical equipment and the medical equipment. The system comprises a main power supply module, a slave power supply module and a voltage regulation module. The main power supply module comprises a first battery pack and a first DCDC converter, and is used for converting the voltage of the first battery pack into a first voltage and outputting the first voltage to a medical equipment power supply end; and the slave power supply module comprises a second battery pack and a second DCDC converter, and is used for converting the voltage of the second battery pack into a second voltage and outputting the second voltage to the medical equipment power supply end. The voltage regulation module monitors the capacity of the two battery packs in real time and generates a voltage regulation signal to the second DCDC converter based on a capacity comparison result so as to regulate the second voltage. The system can solve the technical problem that the energy utilization rate of the battery pack in the medical equipment adopting a double-battery-pack power supply system is low.

Description

Technical Field

[0001] The present invention relates to the field of power supply systems for medical equipment, and in particular to a dual-battery pack power supply system for medical equipment and the medical equipment. Background Art

[0002] With the continuous advancement of medical technology, portable medical devices are playing an increasingly important role in clinical diagnosis and treatment. These devices are often battery-powered to ensure reliable operation in various environments. The stability and durability of the power supply system in medical devices are directly related to device performance and patient safety, placing particularly stringent requirements on battery-powered systems.

[0003] Currently, medical equipment often uses dual-battery power systems to improve power reliability. However, existing dual-battery power systems still have some technical issues. Due to differences in battery packs, such as varying capacities within the same model, significant capacity differences between different models, or differences in the discharge power of individual DC-DC modules during grid connection, the capacity of one battery pack can be significantly lower than that of the other. In this case, system shutdown relies on the battery pack with the lowest capacity, while the remaining battery pack's capacity is not fully utilized, reducing the battery pack's energy efficiency.

[0004] Therefore, for medical equipment that uses a dual-battery pack power supply system, how to improve the energy utilization of the battery pack remains a technical problem that needs to be solved urgently. Summary of the Invention

[0005] In order to solve the technical problem of low battery pack energy utilization in medical equipment using a dual battery pack power supply system, a dual battery pack power supply system for medical equipment and medical equipment are provided.

[0006] The present invention solves its technical problems by adopting a technical solution: providing a dual-battery pack power supply system for medical equipment, comprising a main power supply module 100, a secondary power supply module 200, and a voltage regulation module 300. The main power supply module 100 comprises a first battery pack 110 and a first DCDC converter 120. The first DCDC converter 120 is configured to convert the voltage of the first battery pack 110 into a first voltage VOUT1 and output it to the power supply terminal of the medical equipment. The secondary power supply module 200 comprises a second battery pack 210 and a second DCDC converter 220. The second DCDC converter 220 is configured to convert the voltage of the second battery pack 210 into a second voltage VOUT2 and output it to the power supply terminal of the medical equipment. The voltage regulation module 300 is configured to monitor the capacity of the first battery pack 110 and the capacity of the second battery pack 210 in real time, and based on the comparison of the capacity of the first battery pack 110 and the capacity of the second battery pack 210, generate a voltage regulation signal to the second DCDC converter 220 to reduce or increase the second voltage VOUT2.

[0007] Preferably, the voltage regulation module 300 includes: a first current sampling unit 310, configured to collect the current of the main power supply module 100 and obtain a first current sampling signal; a second current sampling unit 320, configured to collect the current of the slave power supply module 200 and obtain a second current sampling signal; a control and regulation unit 330, configured to: when it is monitored that there is no difference between the capacity of the first battery pack 110 and the capacity of the second battery pack 210, generate the voltage regulation signal by comparing the first current sampling signal with the second current sampling signal; when it is monitored that there is a difference between the capacity of the first battery pack 110 and the capacity of the second battery pack 210, process the first current sampling signal to generate a first current sampling processing signal, and generate the voltage regulation signal by comparing the first current sampling processing signal with the second current sampling signal.

[0008] Furthermore, the control and regulation unit 330 includes: a controller unit 331, configured to output a control signal when it is monitored that there is a difference between the capacity of the first battery pack 110 and the capacity of the second battery pack 210; a signal processing unit 332, configured to process the input first current sampling signal to generate a first current sampling processing signal when the control signal is received, and output the first current sampling processing signal; when the control signal is not received, not process the input first current sampling signal and directly output the first current sampling signal; a current comparison unit 333, configured to generate the voltage regulation signal by comparing the first current sampling processing signal with the second current sampling signal; or, to generate the voltage regulation signal by comparing the first current sampling signal with the second current sampling signal.

[0009] Preferably, the controller unit 331 is configured to: when it is monitored that the capacity of the first battery pack 110 is lower than the capacity of the second battery pack 210, output a first control signal so that the generated first current sampling processing signal is smaller than the first current sampling signal; when it is monitored that the capacity of the first battery pack 110 is higher than the capacity of the second battery pack 210, output a second control signal so that the generated first current sampling processing signal is larger than the first current sampling signal.

[0010] Furthermore, the signal processing unit 332 is configured to: when receiving the first control signal, process the input first current sampling signal to generate a first current sampling processing signal that is smaller than the first current sampling signal, and output it; when receiving the second control signal, process the input first current sampling signal to generate a first current sampling processing signal that is larger than the first current sampling signal, and output it.

[0011] Preferably, the first voltage VOUT1 is initially set to be greater than the second voltage VOUT2.

[0012] Furthermore, the current comparison unit 333 is configured to compare the first current sampling signal with the second current sampling signal, and generate the voltage adjustment signal to increase the second voltage VOUT2 when the first current sampling signal is greater than the second current sampling signal.

[0013] Preferably, the current comparison unit 333 is further configured to: compare the magnitudes of the first current sampling processing signal and the second current sampling signal; when the first current sampling processing signal is greater than the second current sampling signal, generate the voltage adjustment signal to increase the second voltage VOUT2; when the first current sampling processing signal is less than the second current sampling signal, generate the voltage adjustment signal to reduce the second voltage VOUT2.

[0014] Furthermore, the controller unit 331 is configured to read the capacity of the first battery pack 110 and the second battery pack 210 via SMBUS.

[0015] The beneficial effects of the present invention are: By setting up a main power supply module 100, a slave power supply module 200 and a voltage regulation module 300, wherein the voltage regulation module 300 is configured to generate a voltage regulation signal to the DCDC converter of the slave power supply module 200 based on the comparison of the capacity of the battery pack of the main power supply module 100 and the capacity of the battery pack of the slave power supply module 200, so as to reduce or increase the output voltage of the slave power supply module 200, thereby realizing dynamic adjustment of the discharge power of the dual battery packs, and effectively solving the problem of low energy utilization due to difference in battery pack capacity in the prior art.

[0016] When there is no difference in the capacity of the two battery packs, the system directly compares the output current of the two battery packs and adjusts the output voltage of the slave power supply module 200 to make the output power of the two battery packs the same; when there is a difference in the capacity of the two battery packs, the system pre-processes the current sampling signal of the main power supply module 100 to dynamically adjust the output power ratio of the two battery packs to ensure that the capacity difference between the two battery packs is not too large, thereby improving the energy utilization of the battery packs.

[0017] In addition, the system also improves the compatibility of battery packs of different capacities in powering the system, allowing battery packs of different models and capacities to work together better and provide a more stable and reliable power supply for medical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a dual-battery pack power supply system for medical equipment according to an embodiment of the present invention is shown; Figure 2 Another structural schematic diagram of a dual battery pack power supply system for medical equipment according to an embodiment of the present invention is shown; Figure 3 Another structural schematic diagram of a dual battery pack power supply system for medical equipment according to an embodiment of the present invention is shown; Figure 4 Another structural schematic diagram of a dual battery pack power supply system for medical equipment according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0019] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings and embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention. Example

[0020] Figure 1FIG1 shows a schematic structural diagram of a dual battery pack power supply system for medical equipment according to an embodiment of the present invention. Figure 1 As shown, the system may include a master power supply module 100 , a slave power supply module 200 and a voltage regulation module 300 .

[0021] Figure 2 Another structural diagram of a dual battery pack power supply system for medical equipment according to an embodiment of the present invention is shown. Figure 2 As shown, where: The main power supply module 100 may include a first battery pack 110 and a first DC-DC converter 120. The first battery pack 110 may be a lithium-ion battery with, for example, a rated voltage of 11.1V and a capacity of 5000mAh. The first DC-DC converter 120 may be a step-down converter, converting the voltage of the first battery pack 110 into a first voltage VOUT1 and outputting it to the power supply terminal of the medical device. The first voltage VOUT1 may be set to 10V to meet the power supply requirements of the medical device.

[0022] The secondary power supply module 200 includes a second battery pack 210 and a second DC-DC converter 220. The second battery pack 210 can also be a lithium-ion battery. For example, its rated voltage is 11.1V and its capacity is 5000mAh. The second DC-DC converter 220 also uses a step-down converter to convert the voltage of the second battery pack 210 to a second voltage VOUT2, which is output to the power supply terminal of the medical device. The second voltage VOUT2 is initially set to 9.8V, slightly lower than the first voltage VOUT1.

[0023] The voltage regulation module 300 is connected to the master power module 100 and the slave power module 200 and is configured to monitor the capacity of the first battery pack 110 and the capacity of the second battery pack 210 in real time. The voltage regulation module 300 reads the capacity information of the first battery pack 110 and the second battery pack 210 every five seconds via a built-in microcontroller. Based on the comparison result of the capacity of the first battery pack 110 and the capacity of the second battery pack 210, the voltage regulation module 300 generates a voltage regulation signal to the second DC-DC converter 220 to reduce or increase the second voltage VOUT2.

[0024] Figure 3 Another structural diagram of a dual battery pack power supply system for medical equipment according to an embodiment of the present invention is shown. Figure 3As shown, the voltage regulation module 300 may include a first current sampling unit 310, a second current sampling unit 320, and a control and regulation unit 330. The first current sampling unit 310 may utilize a high-precision current sampling chip configured to acquire the current of the main power supply module 100 and obtain a first current sampling signal. The sampling accuracy of this current sampling chip is ±0.5%, and the sampling range is 0-10A. The second current sampling unit 320 also utilizes a high-precision current sampling chip configured to acquire the current of the slave power supply module 200 and obtain a second current sampling signal. The sampling accuracy and sampling range of this current sampling chip are the same as those of the first current sampling unit 310.

[0025] Figure 4 Another structural diagram of a dual battery pack power supply system for medical equipment according to an embodiment of the present invention is shown. Figure 4 As shown, the control and regulation unit 330 includes a controller unit 331, a signal processing unit 332, and a current comparison unit 333. The controller unit 331 can be a 32-bit microcontroller operating at 80 MHz. It is configured to output a control signal when it detects a difference between the capacity of the first battery pack 110 and the capacity of the second battery pack 210. Specifically, the controller unit 331 reads the capacity of the first battery pack 110 and the second battery pack 210 via the SMBUS bus. The communication rate of the SMBUS bus can be set to 100 kHz, and the timeout period for each read operation is 100 ms.

[0026] When the controller unit 331 detects that there is no difference between the capacity of the first battery pack 110 and the capacity of the second battery pack 210 (i.e., the difference between the two capacities is less than a preset threshold, such as 5%), the control and regulation unit 330 generates a voltage regulation signal by comparing the first current sampling signal with the second current sampling signal. In this case, the controller unit 331 does not output a control signal, and the signal processing unit 332 directly transmits the first current sampling signal to the current comparison unit 333.

[0027] When the controller unit 331 detects a difference between the capacity of the first battery pack 110 and the capacity of the second battery pack 210, that is, the capacity difference between the two is greater than or equal to a preset threshold, for example, 5%, the control and regulation unit 330 processes the first current sampling signal to generate a first current sampling processing signal, and generates a voltage regulation signal by comparing the first current sampling processing signal with the second current sampling signal.

[0028] The controller unit 331 is configured to: when it is monitored that the capacity of the first battery pack 110 is lower than the capacity of the second battery pack 210, output a first control signal so that the generated first current sampling processing signal is smaller than the first current sampling signal; when it is monitored that the capacity of the first battery pack 110 is higher than the capacity of the second battery pack 210, output a second control signal so that the generated first current sampling processing signal is larger than the first current sampling signal.

[0029] The signal processing unit 332 can be implemented as a DAC (digital-to-analog converter), specifically a digital signal processing chip. The signal processing unit 332 is configured to: upon receiving a first control signal, process the input first current sampling signal to generate and output a first current sampling processed signal that is smaller than the first current sampling signal; and upon receiving a second control signal, process the input first current sampling signal to generate and output a first current sampling processed signal that is larger than the first current sampling signal.

[0030] Specifically, when the signal processing unit 332 receives the first control signal, it multiplies the first current sampling signal by a coefficient less than 1, such as 0.8, to generate a first current sampling processing signal less than the first current sampling signal; when the signal processing unit 332 receives the second control signal, it multiplies the first current sampling signal by a coefficient greater than 1, such as 1.2, to generate a first current sampling processing signal greater than the first current sampling signal.

[0031] When the signal processing unit 332 does not receive the control signal, it does not process the input first current sampling signal and directly outputs the first current sampling signal.

[0032] The current comparison unit 333 may be a comparator chip configured to generate a voltage regulation signal by comparing the first current sampling signal with the second current sampling signal; or to generate a voltage regulation signal by comparing the first current sampling signal with the second current sampling signal.

[0033] The first voltage VOUT1 is initially set to be greater than the second voltage VOUT2. Specifically, the first voltage VOUT1 is set to 10V, and the second voltage VOUT2 is initially set to 9.8V, with a difference of 0.2V between the two. This configuration allows the primary power supply module 100 to bear a larger power supply load, while the secondary power supply module 200 bears a smaller power supply load.

[0034] The current comparison unit 333 is configured to compare the first current sampling signal with the second current sampling signal and, when the first current sampling signal is greater than the second current sampling signal, generate a voltage adjustment signal to increase the second voltage VOUT2. Specifically, when the first current sampling signal is greater than the second current sampling signal by more than a preset threshold (e.g., 0.5 A), the current comparison unit 333 generates a voltage adjustment signal to instruct the second DCDC converter 220 to increase the second voltage VOUT2 by 0.1 V.

[0035] The current comparison unit 333 is further configured to: compare the magnitudes of the first current sampling processing signal and the second current sampling signal; when the first current sampling processing signal is greater than the second current sampling signal, generate a voltage adjustment signal to increase the second voltage VOUT2; when the first current sampling processing signal is less than the second current sampling signal, generate a voltage adjustment signal to reduce the second voltage VOUT2.

[0036] Specifically, when the first current sampling processing signal is greater than the second current sampling signal by more than a preset threshold value (for example, 0.5 A), the current comparison unit 333 generates a voltage adjustment signal to instruct the second DCDC converter 220 to increase the second voltage VOUT2 by 0.1 V; when the first current sampling processing signal is less than the second current sampling signal by more than a preset threshold value (for example, 0.5 A), the current comparison unit 333 generates a voltage adjustment signal to instruct the second DCDC converter 220 to reduce the second voltage VOUT2 by 0.1 V.

[0037] The controller unit 331 is configured to read the capacities of the first and second battery packs 110 and 210 via the SMBUS. The SMBUS is a two-wire serial bus used for communication within smart battery systems. The controller unit 331 sends a capacity read command to the first and second battery packs 110 and 210 via the SMBUS. Upon receiving the command, the first and second battery packs 110 and 210 return the current capacity information to the controller unit 331 via the SMBUS.

[0038] In practical applications, this dual-battery power supply system can be used in portable medical devices such as portable ultrasound equipment (e.g., color Doppler ultrasound equipment), portable ventilators, and portable ECG monitors. These medical devices typically require long periods of continuous operation and place high demands on the reliability of the power supply system. Using a dual-battery power supply system can improve the reliability and stability of the power supply system, extending the operating time of the medical devices.

[0039] When the medical device is operating, both the primary power supply module 100 and the secondary power supply module 200 simultaneously supply power to the device. Because the first voltage VOUT1 is greater than the second voltage VOUT2, the primary power supply module 100 bears a larger power load, while the secondary power supply module 200 bears a smaller power load. As the medical device continues operating, the capacities of the first and second battery packs 110 and 210 gradually decrease.

[0040] If the capacity of the first battery pack 110 and the second battery pack 210 decreases at the same rate, that is, there is no difference in their capacities, the voltage regulation module 300 generates a voltage regulation signal by comparing the first current sampling signal with the second current sampling signal to adjust the second voltage VOUT2 so that the power supply loads of the main power supply module 100 and the slave power supply module 200 tend to be balanced.

[0041] If the capacity of the first battery pack 110 decreases faster than that of the second battery pack 210, that is, the capacity of the first battery pack 110 is lower than that of the second battery pack 210, the voltage regulation module 300 processes the first current sampling signal to generate a first current sampling processing signal that is smaller than the first current sampling signal. By comparing the first current sampling processing signal with the second current sampling signal, a voltage regulation signal is generated to increase the second voltage VOUT2, so that the slave power supply module 200 bears more power supply load, reducing the power supply burden of the main power supply module 100, thereby slowing down the capacity reduction rate of the first battery pack 110.

[0042] If the capacity of the first battery pack 110 decreases slower than that of the second battery pack 210, that is, the capacity of the first battery pack 110 is higher than that of the second battery pack 210, the voltage regulation module 300 processes the first current sampling signal to generate a first current sampling processing signal that is greater than the first current sampling signal. By comparing the first current sampling processing signal with the second current sampling signal, a voltage regulation signal is generated to reduce the second voltage VOUT2, so that the main power supply module 100 bears more power supply load, reduces the power supply burden of the slave power supply module 200, and thus slows down the capacity reduction rate of the second battery pack 210.

[0043] In this way, the dual battery pack power supply system can dynamically adjust the second voltage VOUT2 according to the capacity difference between the first battery pack 110 and the second battery pack 210, so that the capacity reduction rate of the two battery packs tends to be consistent, thereby maximizing the working time of the medical equipment. Example

[0044] An embodiment of the present invention further provides a medical device comprising the dual-battery pack power supply system described in Example 1. The medical device can be an ultrasound device (e.g., a color Doppler ultrasound device), a ventilator, an electrocardiogram monitor, etc., and has an operating voltage of 9-12V and a maximum operating current of 5A.

[0045] The medical device integrates a dual battery pack power supply system, including a main power supply module 100, a slave power supply module 200 and a voltage regulation module 300.

[0046] The first battery pack 110 in the main power supply module 100 can utilize a high-energy-density lithium-ion battery with a rated voltage of 11.1V and a capacity of 6000mAh. The first DC-DC converter 120 utilizes a high-efficiency step-down converter with a conversion efficiency of up to 95%. It converts the voltage of the first battery pack 110 into a first voltage VOUT1 (10V) and outputs it to the power supply terminal of the medical device.

[0047] The second battery pack 210 in the power supply module 200 also uses high-energy-density lithium-ion batteries with a rated voltage of 11.1V and a capacity of 6000mAh. The second DC-DC converter 220 also uses a high-efficiency step-down converter with a conversion efficiency of up to 95%. It converts the voltage of the second battery pack 210 into a second voltage VOUT2 and outputs it to the power supply terminal of the medical device. The second voltage VOUT2 is initially set to 9.8V, slightly lower than the first voltage VOUT1.

[0048] The voltage regulation module 300 uses a high-performance microcontroller and a high-precision current sampling chip to monitor the capacity of the first and second battery packs 110 and 210, as well as the output currents of the master and slave power supply modules 100 and 200 in real time. Based on the monitoring results, the voltage regulation module 300 dynamically adjusts the second voltage VOUT2 to ensure that the capacity of the two battery packs decreases at a consistent rate.

[0049] The medical device is also equipped with an LCD display, which displays information such as the device's operating status, the remaining capacity of the first and second battery packs 110 and 210, and the estimated remaining operating time. This allows users to monitor the device's power supply status in real time and take timely action, such as replacing the battery pack or connecting to an external power source.

[0050] When the medical device is operating, both the primary power supply module 100 and the secondary power supply module 200 simultaneously supply power to the device. Because the first voltage VOUT1 is greater than the second voltage VOUT2, the primary power supply module 100 bears a greater power load, while the secondary power supply module 200 bears a smaller power load. As the device continues to operate, the voltage regulation module 300 dynamically adjusts the second voltage VOUT2 based on the capacity difference between the first battery pack 110 and the second battery pack 210, ensuring that the capacity of the two battery packs decreases at a consistent rate, thereby maximizing the device's operating time.

[0051] When the remaining capacity of both the first and second battery packs 110 and 210 falls below a preset threshold (e.g., 10%), the medical device issues an alarm, prompting the user to replace the battery packs or connect to an external power source. If the user fails to take prompt action, the medical device automatically enters low-power mode when the remaining capacity of both the first and second battery packs 110 and 210 falls below another preset threshold (e.g., 5%) to extend its operating time.

[0052] By using a dual-battery power supply system, the medical device can operate continuously for more than 12 hours, meeting clinical requirements. Furthermore, the use of dynamic voltage regulation technology extends the service life of the two battery packs, reducing the cost of equipment operation.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A dual battery pack power supply system for medical equipment, characterized in that: include: A main power supply module, comprising a first battery pack and a first DCDC converter, wherein the first DCDC converter is configured to convert the voltage of the first battery pack into a first voltage and output the first voltage to a power supply terminal of the medical device; A slave power supply module includes a second battery pack and a second DCDC converter, wherein the second DCDC converter is configured to convert the voltage of the second battery pack into a second voltage and output the second voltage to a power supply terminal of the medical device; A voltage regulation module is configured to monitor the capacity of the first battery pack and the capacity of the second battery pack in real time, and based on a comparison of the capacity of the first battery pack and the capacity of the second battery pack, generate a voltage regulation signal to the second DCDC converter to reduce or increase the second voltage.

2. The system according to claim 1, wherein: The voltage regulation module includes: a first current sampling unit, configured to collect the current of the main power supply module to obtain a first current sampling signal; a second current sampling unit, configured to collect the current of the slave power supply module to obtain a second current sampling signal; Control and regulation unit, configured as: When it is monitored that there is no difference between the capacity of the first battery pack and the capacity of the second battery pack, generating the voltage regulation signal by comparing the first current sampling signal with the second current sampling signal; When a difference is detected between the capacity of the first battery pack and the capacity of the second battery pack, the first current sampling signal is processed to generate a first current sampling processing signal, and the voltage adjustment signal is generated by comparing the first current sampling processing signal with the second current sampling signal.

3. The system according to claim 2, characterized in that The control and adjustment unit includes: a controller unit configured to output a control signal when detecting a difference between the capacity of the first battery pack and the capacity of the second battery pack; a signal processing unit configured to, when receiving the control signal, process the input first current sampling signal to generate a first current sampling processing signal, and output the first current sampling processing signal; and, when not receiving the control signal, not process the input first current sampling signal and directly output the first current sampling signal; The current comparison unit is configured to generate the voltage adjustment signal by comparing the first current sampling processing signal with the second current sampling signal; or to generate the voltage adjustment signal by comparing the first current sampling signal with the second current sampling signal.

4. The system according to claim 3, characterized in that The controller unit is configured as follows: When it is monitored that the capacity of the first battery pack is lower than the capacity of the second battery pack, outputting a first control signal to make the generated first current sampling processing signal smaller than the first current sampling signal; When it is monitored that the capacity of the first battery pack is higher than the capacity of the second battery pack, a second control signal is output to make the generated first current sampling processing signal greater than the first current sampling signal.

5. The system according to claim 4, characterized in that The signal processing unit is configured as follows: When receiving the first control signal, processing the input first current sampling signal to generate a first current sampling processed signal smaller than the first current sampling signal, and outputting the signal; When the second control signal is received, the input first current sampling signal is processed to generate a first current sampling processed signal greater than the first current sampling signal, and the first current sampling processed signal is output.

6. The system according to claim 5, characterized in that The first voltage is initially set to be greater than the second voltage.

7. The system according to claim 6, characterized in that The current comparison unit is configured as follows: The first current sampling signal and the second current sampling signal are compared, and when the first current sampling signal is greater than the second current sampling signal, the voltage adjustment signal is generated to increase the second voltage.

8. The system according to claim 7, characterized in that The current comparison unit is further configured as: Comparing the magnitudes of the first current sampling processing signal and the second current sampling signal; When the first current sampling signal is greater than the second current sampling signal, generating the voltage adjustment signal to increase the second voltage; When the first current sampling signal is smaller than the second current sampling signal, the voltage adjustment signal is generated to reduce the second voltage.

9. The system according to any one of claims 2 to 8, characterized in that: The controller unit is configured to read the capacities of the first battery pack and the second battery pack via SMBUS.

10. A medical device, characterized in that: A system comprising any one of claims 1 to 9.

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