Tumor electric field treatment system and switching control circuit thereof

Abstract

The application relates to the technical field of tumor electric field treatment, and discloses a tumor electric field treatment system and a switching control circuit thereof, wherein the switching control circuit comprises: a first switch tube configured to control whether a power supply path between a power supply device and a load is connected; a power supply switch configured to be turned on or turned off according to a trigger instruction; a voltage dividing unit connected with an output end of the power supply device, configured to divide the power supply voltage output by the power supply device and provide the divided power supply voltage to the power supply switch; and a control unit connected with the first switch tube, the power supply switch and the voltage dividing unit respectively, configured to control the first switch tube to be turned on or turned off according to the switching state of the power supply switch. The application can greatly reduce the voltage and turn-on current borne by the power supply switch, reduce the volume of the power supply switch, and be beneficial to realizing the miniaturization and light weight of the equipment, and greatly reduce the cost.

Description

Technical Field

[0001] This application relates to the field of tumor electric field therapy technology, and in particular to a switch control circuit for a tumor electric field therapy system and a tumor electric field therapy system having the switch control circuit. Background Technology

[0002] Using electric fields to treat tumors is currently at the forefront of cancer treatment research. Tumor Treating Fields (TTF) is a method that applies low-intensity, medium-frequency alternating electric fields to cancer cells, thereby interfering with the process of cell mitosis, inhibiting cancer cell mitosis, and inducing apoptosis, thus achieving a therapeutic effect. Studies have shown that electric field therapy is significantly effective in treating diseases such as glioblastoma, non-small cell lung cancer, and malignant pleural mesothelioma. The electric field applied by this method can affect the aggregation of microtubules in dividing cancer cells, prevent the formation of spindle fibers in dividing cancer cells, inhibit the process of cancer cell mitosis, and induce apoptosis in cancer cells.

[0003] In related technologies, tumor electric field therapy systems for tumor treatment mainly include a tumor electric field therapy device and electrode patches electrically connected to the device. Typically, the electrode patches are applied to the skin corresponding to the lesion, thereby applying alternating current signals to the tumor tissue area for electric field therapy. Because the power switch of a tumor electric field therapy device generally needs to switch on and off large currents and voltages (e.g., 3A current, 40V voltage), a large switch (e.g., a rocker switch) is usually required to control the power supply. This limits the size of the tumor electric field therapy device due to the size limitation of the power switch. Furthermore, the large size of the power switch also makes waterproof design of the tumor electric field therapy device difficult, reducing the device's reliability. Utility Model Content

[0004] This application provides a switch control circuit for a tumor electric field therapy system and a tumor electric field therapy system having the switch control circuit. By optimizing the design of the switch control circuit connected between the power supply device and the load, the power switch is avoided from directly controlling the switching of the power supply, thereby greatly reducing the voltage and current that the power switch can withstand. This facilitates the miniaturization of the power switch, which is beneficial for achieving miniaturization and weight reduction of the device, reducing the size and weight of the tumor electric field therapy instrument. This avoids burdening the patient during electric field therapy, improves patient comfort, and reduces costs. Furthermore, the smaller size of the power switch also facilitates the waterproof design of the tumor electric field therapy instrument, greatly improving the reliability of the device.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, embodiments of this application provide a switch control circuit for a tumor electric field therapy system. The tumor electric field therapy system includes a power supply device and a load. The switch control circuit includes: a first switch transistor connected between the output terminal of the power supply device and the load to control whether the power supply path between the power supply device and the load is connected; a power switch configured to turn on or off according to a trigger command; a voltage divider unit connected to the output terminal of the power supply device, configured to divide the power supply voltage output by the power supply device and provide the divided power supply voltage to the power switch; and a control unit connected to the first switch transistor, the power switch, and the voltage divider unit, configured to control the first switch transistor to turn on or off according to the switching state of the power switch.

[0007] According to the switching control circuit of the tumor electric field therapy system in this application embodiment, a first switching transistor is set between the output terminal of the power supply device and the load. The first switching transistor is used to realize the switching of the power supply, avoiding the direct switching of the power supply by the power switch. The power supply voltage output by the power supply device is divided by a voltage divider unit, and the divided power supply voltage is provided to the power switch. This can greatly reduce the voltage and current that the power switch can withstand, thereby facilitating the miniaturization design of the power switch. This is beneficial to the miniaturization and weight reduction of the device, reducing the size and weight of the tumor electric field therapy instrument. As a result, it will not burden the patient during electric field therapy, improving patient comfort. At the same time, it can also reduce costs. Furthermore, the smaller size of the power switch is also beneficial to the waterproof design of the tumor electric field therapy instrument, greatly improving the reliability of the device.

[0008] Optionally, in some embodiments of this application, the voltage divider unit includes: a first resistor and a second resistor, one end of the first resistor is adapted to be connected to the output terminal of the power supply device, the other end of the first resistor is connected to one end of the second resistor to form a first node, and the other end of the second resistor is grounded, wherein the first node is adapted to provide the voltage divided supply voltage to the power switch to reduce the voltage withstand and turn-on current of the power switch.

[0009] Optionally, in some embodiments of this application, the control unit includes: a third resistor, one end of which is connected to the first node; a second switch, the control terminal of which is connected to the other end of the third resistor, and the first end of which is grounded; a fourth resistor, one end of which is connected to the control terminal of the first switch, and the other end of which is connected to the second end of the second switch; and a fifth resistor, one end of which is adapted to be connected to the output terminal of the power supply device, and the other end of which is connected to the control terminal of the first switch and one end of the fourth resistor, respectively.

[0010] Optionally, in some embodiments of this application, the control unit further includes: a first capacitor connected in parallel with the fifth resistor; and a second capacitor connected between the control terminal and the first terminal of the second switching transistor.

[0011] Specifically, in some embodiments of this application, the first switch is a PMOS transistor and the second switch is an NMOS transistor.

[0012] Optionally, in some embodiments of this application, the switching control circuit of the tumor electric field therapy system further includes: a third capacitor connected in parallel with the second resistor; and a fourth capacitor connected in parallel between the output terminal of the switching control circuit and the ground terminal GND.

[0013] Optionally, in some embodiments of this application, the switching control circuit of the tumor electric field therapy system further includes: a first transient voltage suppression diode, the first terminal of which is connected to the output terminal of the power supply device, and the second terminal of which is grounded; and a second transient voltage suppression diode, which is connected in parallel with the power switch.

[0014] Optionally, in some embodiments of this application, the power switch adopts a waterproof structural design.

[0015] Specifically, in some embodiments of this application, the power switch is a self-locking switch.

[0016] Secondly, embodiments of this application also provide a tumor electric field therapy system, including: a power supply device and a load; a switch control circuit for the tumor electric field therapy system described in the above embodiments, wherein the switch control circuit is configured to control whether the power supply device supplies power to the load.

[0017] According to the tumor electric field therapy system of this application embodiment, based on the switch control circuit described in the above embodiment, the first switching transistor can realize the switching of the power supply, avoiding the power switch directly realizing the switching of the power supply. The power supply voltage output by the power supply device is divided by the voltage divider unit, and the divided power supply voltage is provided to the power switch. This can greatly reduce the voltage and current that the power switch can withstand, thereby facilitating the miniaturization design of the power switch. This is beneficial to the miniaturization and weight reduction of the device, reducing the size and weight of the tumor electric field therapy instrument, thus not burdening the patient during electric field therapy, improving patient comfort, and reducing costs. In addition, the smaller size of the power switch is also conducive to the waterproof design of the tumor electric field therapy instrument, greatly improving the reliability of the device. While ensuring the tumor electric field therapy effect and improving the safety of electric field therapy, it also improves the ease of use and user experience of the device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a block diagram of a tumor electric field therapy system provided in one embodiment of this application;

[0020] Figure 2 A schematic diagram of the switching control circuit of a tumor electric field therapy system provided in one embodiment of this application;

[0021] Figure 3 This is a front and rear schematic diagram of a tumor electric field therapy device provided in one embodiment of this application;

[0022] Figure 4 The left and right schematic diagrams are of a tumor electric field therapy device provided in one embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the waterproof structure design of a tumor electric field therapy device provided in one embodiment of this application. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In related technologies, tumor electric field therapy systems for tumor treatment mainly include a tumor electric field therapy device and an electrode patch electrically connected to the tumor electric field therapy device. The tumor electric field therapy device generates an alternating current signal of a specific frequency. This alternating current signal is applied to the tumor tissue area through the electrode patch applied to the skin corresponding to the lesion to perform electric field therapy to inhibit the proliferation or spread of tumor cells.

[0026] Since the power switch of a tumor electric field therapy device generally needs to switch on and off large currents and high voltages (e.g., 3A current and 40V voltage), a large switch (e.g., a rocker switch) is usually required to switch the power supply on and off. This results in the size of the tumor electric field therapy device being limited by the size of the power switch, preventing further reduction in its size. At the same time, the large size of the power switch also makes it difficult to design a waterproof structure for the tumor electric field therapy device, reducing the reliability of the device.

[0027] Therefore, the switching control circuit of the tumor electric field therapy system and the tumor electric field therapy system having the switching control circuit provided in this application embodiment, through optimized design of the switching control circuit connected between the power supply device and the load, can avoid the power switch directly realizing the switching of the power supply, thereby greatly reducing the voltage and current that the power switch can withstand, facilitating the miniaturization design of the power switch, which is conducive to realizing the miniaturization and weight reduction of the device, reducing the size and weight of the tumor electric field therapy instrument, thus not burdening the patient during electric field therapy, improving patient comfort, and reducing costs. In addition, the smaller size of the power switch is also conducive to the waterproof design of the tumor electric field therapy instrument, greatly improving the reliability of the device.

[0028] The following description, with reference to the accompanying drawings, details the switching control circuit of the tumor electric field therapy system provided in the embodiments of this application, as well as the tumor electric field therapy system having the switching control circuit.

[0029] Figure 1 This is a block diagram of a tumor electric field therapy system according to an embodiment of this application. Figure 1As shown, the tumor electric field therapy system 100 mainly includes a tumor electric field therapy device 1 and a load 18. The tumor electric field therapy device 1 includes a battery 11, an adapter 12, a power supply switching circuit 16, a power switch 15, and an analog switch circuit 17. The adapter 12 is connected to the power supply switching circuit 16 through an adapter interface 14, and the battery 11 is connected to the power supply switching circuit 16 through a battery interface 13. The power supply switching circuit 16 can be configured to control one of the battery 11 and the adapter 12 to supply power to the load 18 through the analog switch circuit 17. The power switch 15 is exposed on the tumor electric field therapy device 1 and connected to the analog switch circuit 17 to control the on / off state of the power supply to the tumor electric field therapy device 1. The load 18 may include an electric field generating device (not shown in the figure) located inside the tumor electric field therapy device 1 and a number of electrode patches (not shown in the figure) located outside the tumor electric field therapy device 1 and electrically connected to the electric field generating device. The electric field generating device may be powered by a battery 11 or an adapter 12 to generate an alternating current signal, which is applied to the tumor tissue area through the electrode patches to inhibit the proliferation or spread of tumor cells.

[0030] Furthermore, the adapter 12 can be an external power supply device independent of the tumor electric field therapy device 1. The adapter 12 is connected to the mains power to supply power to the tumor electric field therapy device 1. The battery 11 is an internal power supply device installed inside the tumor electric field therapy device 1. It can be a rechargeable battery to supply power to the tumor electric field therapy device 1. The two can be switched by the power supply switching circuit 16 to output power to the analog switch circuit 17 respectively.

[0031] In other words, such as Figure 1 As shown, battery 11, adapter 12, power switching circuit 16, adapter interface 14 and battery interface 13 constitute power supply device 200. The power supply output of power supply device 200 (e.g. 3A, 40V) is provided to downstream load 18 through analog switching circuit 17.

[0032] Optionally, the load 18 may also include an adapter (not shown in the figure). The alternating current signal generated by the electric field generator can be output as multiple pairs of alternating current signals through the adapter. These multiple pairs of alternating current signals are applied alternately to the tumor tissue area through multiple pairs of electrode patches to inhibit the proliferation or spread of tumor cells. For example, the frequency of the alternating current generated by the electric field generator can generally be above 100KHz, such as a 200KHz alternating current field.

[0033] refer to Figure 1 and Figure 2 As shown, one embodiment of this application provides a switch control circuit 300 for a tumor electric field therapy system. This switch control circuit 300 is disposed between a power supply device 200 and a load 18, and is used to control whether the power supply device 200 supplies power to the downstream load 18. Figure 2 As shown, the switch control circuit 300 includes a first switching transistor Q1, a power switch 15 (i.e., K1), a voltage divider unit 301, and a control unit 302.

[0034] The first switch Q1 is connected between the output terminal of the power supply device 200 and the load 18 to control whether the power supply path between the power supply device 200 and the load 18 is connected.

[0035] Optionally, in one embodiment of this application, such as Figure 2 As shown, the first switching transistor Q1 can be a PMOS transistor. The source of the first switching transistor Q1 is connected to the input terminal P1 of the switching control circuit 300, which is connected to the output terminal of the power supply device 200. The drain of the first switching transistor Q1 is connected to the output terminal VCC-OUT of the switching control circuit 300. The gate of the first switching transistor Q1 is its control terminal.

[0036] One end of the power switch 15 is connected to the first node of the voltage divider unit 301 (i.e., as described below). Figure 2 The power switch 15 is connected to point ③ in the middle, and the other end of the power switch 15 is grounded. The voltage divider unit 301 is connected to the output terminal of the power supply device 200. The voltage divider unit 301 is configured to divide the power supply voltage output by the power supply device 200 and provide the divided power supply voltage to the power switch 15. The power switch 15 is configured to turn on or off according to a trigger command. The control unit 302 is connected to the first switching transistor Q1, the power switch 15, and the voltage divider unit 301. The control unit 302 is configured to control the first switching transistor Q1 to turn on or off according to the switching state of the power switch 15.

[0037] Therefore, by placing the first switching transistor Q1 between the output terminal of the power supply device 200 and the load 18, and using the on or off state of the power switch 15 to trigger and control the on or off state of the first switching transistor Q1, the power switch 15 is avoided from directly controlling the on and off state of the power supply. Instead, the first switching transistor Q1, which belongs to the semiconductor field-effect transistor, is used to realize the on and off state of the power supply. This can greatly reduce the voltage and on-state current of the power switch 15, which is conducive to the miniaturization design of the power switch 15 and the reduction of its size.

[0038] Specifically, in some embodiments of this application, such as Figure 2As shown, the voltage divider unit 301 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is adapted to be connected to the output terminal of the power supply device 200, for example, it can be connected to the output terminal of the power supply device 200 through the input terminal P1 of the switch control circuit 300. The other end of the first resistor R1 is connected to one end of the second resistor R2, and this connection constitutes a first node. The other end of the second resistor R2 is grounded. The first node is adapted to provide the voltage after voltage division to the power switch 15 to reduce the voltage withstand and the turn-on current of the power switch 15.

[0039] Furthermore, such as Figure 2 As shown, the control unit 302 may include a third resistor R3, a second switch Q2, a fourth resistor R4, and a fifth resistor R5. One end of the third resistor R3 is connected to the first node; the control terminal of the second switch Q2 is connected to the other end of the third resistor R3; the first terminal of the second switch Q2 is grounded; one end of the fourth resistor R4 is connected to the control terminal of the first switch Q1; the other end of the fourth resistor R4 is connected to the second terminal of the second switch Q2; one end of the fifth resistor R5 is adapted to be connected to the output terminal of the power supply device 200; the other end of the fifth resistor R5 is connected to both the control terminal of the first switch Q1 and one end of the fourth resistor R4.

[0040] Specifically, in one example of this application, such as Figure 2 As shown, the second switch Q2 can be an NMOS transistor. The control terminal, first terminal, and second terminal of the second switch Q2 are its gate, source, and drain, respectively. That is, the gate of the second switch Q2 is connected to the other end of the third resistor R3, the source of the second switch Q2 is grounded, and the drain of the second switch Q2 is connected to the other end of the fourth resistor R4.

[0041] In the embodiments of this application, reference is made to Figure 2 As shown, the gate of the second switching transistor Q2 is electrically connected to the first pin of the power switch 15 through the third resistor R3. The second pin of the power switch 15 is grounded. The drain of the second switching transistor Q2 is electrically connected to the gate of the first switching transistor Q1 through the fourth resistor R4. The source of the second switching transistor Q2 is grounded. The source of the first switching transistor Q1 is electrically connected to the positive terminal of the input terminal P1 of the switch control circuit 300, and the drain of the first switching transistor Q1 is connected to the output terminal VCC-OUT of the switch control circuit 300.

[0042] The first resistor R1 and the second resistor R2 form a resistor voltage divider network to divide the supply voltage connected to the input terminal P1 of the switch control circuit 300. The power switch 15 is connected in parallel with the resistor R2. In this way, when the power switch 15 is closed, the supply voltage is limited by the resistor R1, reducing the current flowing through the power switch 15. When the power switch 15 is open, the voltage across the power switch 15 is the same as the voltage across the resistor R2. The resistor voltage divider network greatly reduces the voltage across the power switch 15, thus reducing the voltage that the power switch 15 can withstand.

[0043] Furthermore, the resistor voltage divider network formed by resistors R1 and R2 ensures that when the power supply is connected to the input terminal P1 of the switch control circuit 300 and the power switch 15 is open, the Vgs voltage of the second switch Q2 is greater than or equal to its own Vgs(th), allowing it to conduct smoothly. After the second switch Q2 is turned on, resistors R4 and R5 also form a resistor voltage divider network, which ensures that the Vgs voltage of the first switch Q1 is less than or equal to its own Vgs(th), thus ensuring that the first switch Q1 can conduct smoothly.

[0044] Optionally, in some embodiments of this application, such as Figure 2 As shown, the control unit 302 also includes a first capacitor C1 and a second capacitor C2. The first capacitor C1 is connected in parallel with the fifth resistor R5, and the second capacitor C2 is connected between the control terminal and the first terminal of the second switch Q2.

[0045] In other words, a fifth resistor R5 and a first capacitor C1 are connected in parallel between the source and gate of the first switching transistor Q1. The function of the first capacitor C1 is to stabilize the voltage across the fifth resistor R5, so that the first switching transistor Q1 can conduct stably and reliably when its Vgs voltage is less than or equal to its own Vgs(th). Furthermore, a third resistor R3 can be placed between the first pin of the power switch 15 and the gate of the second switching transistor Q2, and a second capacitor C2 can be placed between the gate of the second switching transistor Q2 and the ground terminal GND. The third resistor R3 serves both as a current limiter and as a low-pass filter with the second capacitor C2, thus filtering out interference.

[0046] Furthermore, in some embodiments of this application, such as Figure 2 As shown, the switching control circuit 300 of the tumor electric field therapy system also includes a third capacitor C3 and a fourth capacitor C4. The third capacitor C3 is connected in parallel with the second resistor R2, and the fourth capacitor C4 is connected in parallel between the output terminal of the switching control circuit 300 and the ground terminal GND.

[0047] The third capacitor C3 is used to stabilize the power supply voltage after the voltage is divided by the first resistor R1 and the second resistor R2. A fourth capacitor C4 can be set between the drain of the first switching transistor Q1 and the ground terminal GND. The fourth capacitor C4 plays a role in voltage regulation and filtering of the voltage output by the output terminal VCC-OUT of the switch control circuit 300.

[0048] Specifically, in some embodiments of this application, such as Figure 2 As shown, the switching control circuit 300 of the tumor electric field therapy system also includes a first transient voltage suppression diode D1 and a second transient voltage suppression diode D2. The first terminal of the first transient voltage suppression diode D1 is connected to the output terminal of the power supply device 200, that is, connected to the VCC pin of the input terminal P1 of the switching control circuit 300. The second terminal of the first transient voltage suppression diode D1 is grounded and connected to the GND pin of the input terminal P1 of the switching control circuit 300. The second transient voltage suppression diode D2 is connected in parallel with the power switch 15.

[0049] The second transient voltage suppression diode D2 is used to protect against static electricity that may be introduced at the power switch 15. The first transient voltage suppression diode D1 is used to protect against and suppress static voltage or surge voltage introduced at the power port.

[0050] At the same time, such as Figure 2 As shown, a sixth resistor R6 and a light-emitting diode D3 can be disposed between the drain of the first switching transistor Q1 and the ground terminal GND. One end of the sixth resistor R6 is electrically connected to the drain of the first switching transistor Q1, and the other end of the sixth resistor R6 is electrically connected to the anode of the light-emitting diode D3. The cathode of the light-emitting diode D3 is grounded. The sixth resistor R6 acts as a current-limiting resistor, and the light-emitting diode D3 acts as a light indicator. Optionally, it can also be placed on the surface of the structural housing of the tumor electric field therapy device 1 to serve as a power switch indicator light.

[0051] For details, please refer to the following: Figure 2As shown, the connection point between the first terminal of the first transient voltage suppression diode D1 and the VCC pin of the input terminal P1 of the switch control circuit 300 is defined as point ① of the switch control circuit 300; the connection point between the fourth resistor R4 and the gate of the first switching transistor Q1 is defined as point ② of the switch control circuit 300; the connection point between the other end of the first resistor R1 and one end of the second resistor R2 is defined as point ③ of the switch control circuit 300 (i.e., the aforementioned first node); and the connection point between the drain of the first switching transistor Q1 and the fourth capacitor C4 is defined as point ④ of the switch control circuit 300. In some embodiments of this application, taking the power supply of the adapter power supply device as an example, the power supply provided by the adapter 12 enters the input terminal P1 of the switch control circuit 300 after being switched by the power supply switching circuit 16. Since the output voltage of the adapter 12 can be 40V, and the power supply switching circuit 16 only switches between adapter power supply and battery power supply, and does not perform voltage transformation, therefore... Figure 2 Point ① still operates at 40V, the same as the output voltage of adapter 12. If power switch 15 is closed at this time, point ③ will be grounded due to the closure of power switch 15, resulting in 0V. At this point, the current flowing through power switch 15 is only I. K1 =40V / R1, while R1 can be configured with a very large resistance value, such as R1=68KΩ, then the current flowing through the power switch 15 is only I. K1 =40V / R1=40V / 68KΩ≈0.588mA, which can greatly reduce the turn-on current of power switch 15. Furthermore, since point ③ is grounded at 0V, and the 0V at point ③ is transmitted to the gate of the second switch Q2 through resistor R3, the Vgs voltage of the second switch Q2 is 0V, and it is less than the Vgs(th) of the second switch Q2. Therefore, the second switch Q2 is not conducting. Since the second switch Q2 is not conducting, the voltage at point ② is also 40V. Then the Vgs voltage of the first switch Q1 is 0V, and it is greater than the Vgs(th) of the first switch Q1. Therefore, the first switch Q1 is not conducting, and the 40V voltage of the adapter cannot be transmitted to point ④ through the first switch Q1. Thus, the function of "similar to power off" is achieved. If power switch 15 is open at this time, resistors R1 and R2 form a voltage divider network. Usually, as long as the voltage divider formed by resistors R1 and R2 (i.e., ...) is maintained... Figure 2 The voltage at point ③ needs to be greater than the Vgs(th) voltage of the second switch Q2. Based on this condition, the resistance value of resistor R2 can be arbitrarily configured. In this embodiment, R2 can be configured as 10KΩ, then the voltage at point ③... This voltage is transmitted to the gate of the second switch Q2 through resistor R3. Therefore, the Vgs voltage of the second switch Q2 is approximately 5.128V, which is greater than the turn-on voltage Vgs(th) of the second switch Q2. Thus, the second switch Q2 is grounded. At this time, resistors R5 and R4 form a voltage divider circuit. When configuring the resistance values ​​of resistors R5 and R4, it is only necessary to ensure that the voltage across resistor R5 (i.e., the voltage divider across the resistor R5) is equal to the voltage across the gate of the second switch Q2. Figure 2 The voltage at point ② minus the voltage at point ① should be less than the Vgs(th) voltage of the first switch Q1. Therefore, in this embodiment, R5 = 100KΩ and R4 = 240KΩ can be configured. The voltage at point ② will then be... Therefore, the Vgs voltage of the first switch Q1 = the voltage at point ② - the voltage at point ① = 28.235V - 40V = -11.765V. This voltage is less than the Vgs(th) voltage of the first switch Q1, so the first switch Q1 is turned on. Then the power supply at point ① can be conducted through the first switch Q1 to point ④ to supply power to the subsequent load 18, thus realizing the function of "similar to power-on".

[0052] In summary, this application, through the optimized design of the power switch 15 combined with the analog switch circuit 17, i.e., the switch control circuit 300, can functionally replace the large ship-shaped power switch. Furthermore, when the power switch 15 is turned on, it only needs to withstand a current in the mA range (as calculated above, I). K1 ≈0.588mA), when the power switch 15 is turned off, it only needs to withstand a much smaller voltage than before (such as the voltage at point ③ calculated above ≈5.128V). Therefore, since the voltage and current that the power switch 15 withstands are greatly reduced, a smaller power switch that is more suitable for waterproof structural design can be selected, such as a self-locking switch.

[0053] Optionally, in some embodiments of this application, the power switch 15 adopts a waterproof structure design, such as a self-locking switch, which is not only small in size but also greatly reduces costs.

[0054] According to the switching control circuit of the tumor electric field therapy system in this application embodiment, a first switching transistor is set between the output terminal of the power supply device and the load. The first switching transistor is used to realize the switching of the power supply, avoiding the direct switching of the power supply by the power switch. The power supply voltage output by the power supply device is divided by a voltage divider unit, and the divided power supply voltage is provided to the power switch. This can greatly reduce the voltage and current that the power switch can withstand, thereby facilitating the miniaturization design of the power switch. This is beneficial to the miniaturization and weight reduction of the device, reducing the size and weight of the tumor electric field therapy instrument. As a result, it will not burden the patient during electric field therapy, improving patient comfort. At the same time, it can also reduce costs. Furthermore, the smaller size of the power switch is also beneficial to the waterproof design of the tumor electric field therapy instrument, greatly improving the reliability of the device.

[0055] refer to Figure 3 , Figure 4 and Figure 5 As shown, this application also provides a tumor electric field therapy device for providing alternating current signals to electrode patches (not shown) to generate a tumor therapeutic electric field between each pair of electrode patches. The tumor electric field therapy device 1 includes a housing (not labeled) with at least one open end, and a cover (not labeled) assembled to and closing the opening of the housing. The housing includes an upper shell 20 and a lower shell 30 assembled with the upper shell 20. In this embodiment, the upper shell 20 and the lower shell 30 are assembled and fixed to form a cylindrical shape with open ends. The cover includes a front cover assembly 10 and a rear cover assembly 40. The front cover assembly 10 is fixed to the front opening of the upper shell 20 and the lower shell 30, and the rear cover assembly 40 is fixed to the rear opening of the upper shell 20 and the lower shell 30. The front cover assembly 10, upper shell 20, lower shell 30, and rear cover assembly 40 together form a cavity. Inside the cavity, there is an inner bracket 60, a power board 71 fixed on the inner bracket 60, and a socket assembly 80 fixed to the side of the inner bracket 60 and exposed from the shell. The power board 71 is equipped with the switch control circuit 300 described in the above embodiment.

[0056] refer to Figure 5As shown, the power board 71 is equipped with a battery connector 711, an adapter socket 712, a USB socket 713, and the aforementioned power switch 15. The aforementioned battery 11 is adapted to be electrically connected to the battery connector 711 to supply power to the power board 71. The aforementioned adapter 12 is adapted to be electrically connected to the power adapter socket 712 to supply power to the power board 71. The USB socket 713 is adapted to be connected to an external host computer for data transmission. The power board 71 is fixed to the right side of the inner bracket 60. The socket assembly 80 is correspondingly fixed to the right edge of the inner bracket 60. The socket assembly 80 is equipped with a plastic body 81, a first waterproof switch component 82, a second waterproof switch component 83, a USB interface cover 84, and a sealed outer shell 85. The plastic body 81 is mounted on the inner bracket 60 and protrudes outward through the upper side wall of the upper shell 20. The plastic body 81 is provided with a first socket 811, a second socket 812, and a third socket 813 respectively corresponding to the power switch 15, the adapter socket 712, and the USB socket 713.

[0057] Combination Figure 4 and Figure 5 As shown, the plastic body 81 protrudes outward from the upper sidewall of the upper shell 20. The inner support 60 has a hollow mounting bracket 65 corresponding to the power switch 15. The second waterproof component 83 is assembled inside the mounting bracket 65 and aligned with the power switch 15. The first waterproof component 82 is assembled inside the second waterproof component 83 and inserted into the first socket 811, and together with the second waterproof component 83, seals the first socket 811. The operator can touch the power switch 15 through the first waterproof component 82 and the second waterproof component 83. The USB interface cover 84 covers the third socket 813 from the outside of the plastic body 81 and can be removed. The first waterproof component 82, the second waterproof component 83, and the USB interface cover 84 can be collectively referred to as sealing components, and the first socket 811, the second socket 812, and the third socket 813 can be collectively referred to as sockets. The sealing shell 85 is fitted over the plastic body 81 to seal the gap between the upper sidewall and the plastic body 81, thus achieving a waterproof seal.

[0058] It can be seen that through the optimized design of the switch control circuit 300, the size of the power switch 15 can be reduced, which greatly facilitates the waterproof and sealed design of the tumor electric field therapy device and improves the reliability of the tumor electric field therapy device.

[0059] In addition, such as Figure 1 As shown, this application embodiment also provides a tumor electric field therapy system 100, including: a power supply device 200, a load 18, and a switch control circuit 300 for the tumor electric field therapy system described in the above embodiment. The switch control circuit 300 is configured to control whether the power supply device 200 supplies power to the load 18.

[0060] According to the tumor electric field therapy system of this application embodiment, based on the switch control circuit described in the above embodiment, the first switching transistor can realize the switching of the power supply, avoiding the power switch directly realizing the switching of the power supply. The power supply voltage output by the power supply device is divided by the voltage divider unit, and the divided power supply voltage is provided to the power switch. This can greatly reduce the voltage and current that the power switch can withstand, thereby facilitating the miniaturization design of the power switch. This is beneficial to the miniaturization and weight reduction of the device, reducing the size and weight of the tumor electric field therapy instrument, thus not burdening the patient during electric field therapy, improving patient comfort, and reducing costs. In addition, the smaller size of the power switch is also conducive to the waterproof design of the tumor electric field therapy instrument, greatly improving the reliability of the device. While ensuring the tumor electric field therapy effect and improving the safety of electric field therapy, it also improves the ease of use and user experience of the device.

[0061] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A switching control circuit for a tumor electric field therapy system, characterized in that, The tumor electric field therapy system includes a power supply device and a load, and the switching control circuit includes: A first switching transistor is connected between the output terminal of the power supply device and the load to control whether the power supply path between the power supply device and the load is connected. A power switch, configured to be turned on or off according to a trigger command; A voltage divider unit is connected to the output terminal of the power supply device. The voltage divider unit is configured to divide the power supply voltage output by the power supply device and provide the divided power supply voltage to the power switch. The control unit is connected to the first switching transistor, the power switch and the voltage divider unit respectively, and the control unit is configured to control the first switching transistor to be turned on or off according to the switching state of the power switch.

2. The switching control circuit of the tumor electric field therapy system according to claim 1, characterized in that, The voltage divider unit includes: A first resistor and a second resistor, one end of the first resistor is adapted to be connected to the output terminal of the power supply device, the other end of the first resistor is connected to one end of the second resistor to form a first node, and the other end of the second resistor is grounded. The first node is adapted to provide the voltage divided by the power supply voltage to the power switch to reduce the voltage withstand and the turn-on current of the power switch.

3. The switching control circuit of the tumor electric field therapy system according to claim 2, characterized in that, The control unit includes: A third resistor, one end of which is connected to the first node; The second switch is connected to the other end of the third resistor, and the first end of the second switch is grounded. A fourth resistor, one end of which is connected to the control terminal of the first switching transistor, and the other end of which is connected to the second terminal of the second switching transistor; A fifth resistor, one end of which is adapted to be connected to the output terminal of the power supply device, and the other end of which is connected to the control terminal of the first switching transistor and one end of the fourth resistor.

4. The switching control circuit of the tumor electric field therapy system according to claim 3, characterized in that, The control unit also includes: A first capacitor, which is connected in parallel with the fifth resistor; The second capacitor is connected between the control terminal and the first terminal of the second switching transistor.

5. The switching control circuit of the tumor electric field therapy system according to claim 3, characterized in that, The first switch is a PMOS transistor, and the second switch is an NMOS transistor.

6. The switching control circuit of the tumor electric field therapy system according to claim 2, characterized in that, Also includes: A third capacitor, which is connected in parallel with the second resistor; The fourth capacitor is connected in parallel between the output terminal of the switch control circuit and the ground terminal GND.

7. The switching control circuit of the tumor electric field therapy system according to claim 2, characterized in that, Also includes: A first transient voltage suppression diode, wherein the first terminal of the first transient voltage suppression diode is connected to the output terminal of the power supply device, and the second terminal of the first transient voltage suppression diode is grounded; The second transient voltage suppression diode is connected in parallel with the power switch.

8. The switching control circuit of the tumor electric field therapy system according to any one of claims 1-7, characterized in that, The power switch features a waterproof design.

9. The switching control circuit of the tumor electric field therapy system according to claim 8, characterized in that, The power switch is a self-locking switch.

10. A tumor electric field therapy system, characterized in that, include: Power supply equipment and load; According to any one of claims 1-9, the switching control circuit of the tumor electric field therapy system is configured to control whether the power supply device supplies power to the load.

Images