Capsule endoscope high-stability power supply control circuit based on Hall switch and power supply system

Abstract

The utility model discloses a Hall switch-based capsule endoscope high-stability power supply control circuit and a power supply system. The power supply control circuit comprises a power supply input end, a digital Hall switch, a filter circuit, a first switch tube, a first current-limiting resistor and a second switch tube, the power input end is connected with the input end of the digital Hall switch, the output end of the digital Hall switch, the filter circuit and the first end of the first switching tube are sequentially connected, the second end of the first switching tube is grounded, and the third end of the first switching tube, the first current-limiting resistor and the first end of the second switching tube are sequentially connected. The second end of the second switch tube is connected with the power input end, and the third end of the second switch tube is the power output end of the power control circuit. According to the utility model, unstable factors can be effectively filtered, the energy consumption is low, the stability is good, and the reliability is high; during use, a patient only needs to take out the capsule endoscope from the storage box, non-inductive starting of the capsule endoscope can be achieved without other operations, use is convenient, and cost is low.

Description

Technical Field

[0001] The utility model relates to a high-stability power supply control circuit and a power supply system for a capsule endoscope based on a Hall switch, belonging to the technical field of power supply control. Background Art

[0002] Capsule endoscopes are medical devices used to examine the human gastrointestinal health. Because they penetrate the human gastrointestinal tract, capsule endoscopes are miniaturized, sealed, and non-detachable. Traditional contact or physical switches are no longer suitable for this device. Due to the unique characteristics of capsule endoscopes, if the internal battery dies, the capsule endoscope must be discarded. Therefore, power control and low power consumption become key technical challenges.

[0003] In the current technical solution, one power control method is to use a photoelectric sensor. The photoelectric sensor is implanted in the capsule endoscope, and the conduction of the switch tube is controlled by irradiating the capsule endoscope with a light source of specific wavelength and intensity. However, this method requires manual handling of the capsule endoscope and irradiation of the photoelectric sensor. The specific signal generated by the photoelectric sensor is used to realize the power on and off function. This not only requires additional light irradiation equipment, but also the photoelectric sensor has high requirements for the angle, intensity, and stability of the light. This increases the difficulty of operation and also increases the problem of power on and off time.

[0004] Another option is to use a TMR magnetoresistive sensor. This technology is based on the tunnel magnetoresistive effect. Under the action of an external magnetic field, the magnetization direction of the two ferromagnetic layers will change, resulting in a change in tunnel resistance, which in turn generates a corresponding electrical signal to achieve the purpose of power switching. Although TMR magnetoresistive sensors have high accuracy and sensitivity, due to the characteristics of TMR magnetoresistive sensors, the resistance change of TMR magnetoresistive sensors is very sensitive to changes in the magnetic field and is easily affected by external factors such as circuit noise and electromagnetic interference, which reduces its measurement accuracy and reliability, and thus affects the stability and reliability of the system. In addition, due to the structural complexity of TMR magnetoresistive sensors and the high manufacturing process requirements, their cost is also relatively high. Utility Model Content

[0005] The utility model provides a high-stability power supply control circuit and a power supply system for a capsule endoscope based on a Hall switch, so as to improve the power supply utilization and reliability of the capsule endoscope.

[0006] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0007] A high-stability power supply control circuit for a capsule endoscope based on a Hall switch comprises: a power supply input terminal, a digital Hall switch (U1), a filter circuit, a first switch tube (Q1), a first current-limiting resistor (R4), and a second switch tube (Q2);

[0008] The power input end is connected to the input end of the digital Hall switch (U1); the output end of the digital Hall switch (U1), the filter circuit and the first end of the first switch tube (Q1) are connected in sequence; the second end of the first switch tube (Q1) is grounded; the third end of the first switch tube, the first current limiting resistor (R4) and the first end of the second switch tube are connected in sequence; the second end of the second switch tube is connected to the power input end; and the third end of the second switch tube is the power output end of the power control circuit.

[0009] A digital Hall effect sensor is an ultra-low-power digital Hall effect switch. A digital Hall effect switch has an input, an output, and a third terminal, the third of which is grounded. The first terminal of the first switch is the gate, the second terminal is the source, and the third terminal is the drain. The first terminal of the second switch is the gate, the second terminal is the source, and the third terminal is the drain.

[0010] The connection between the various devices in this application refers to connection through electrical connection lines.

[0011] In order to further improve reliability and stability, the high-stability power supply control circuit of the capsule endoscope based on the Hall switch further includes: a first decoupling capacitor (C1); an input end of the digital Hall switch (U1), the first decoupling capacitor (C1), and a third end of the digital Hall switch (U1) are connected in sequence. That is, the first decoupling capacitor is connected in parallel to the input end and the third end of the digital Hall switch (U1).

[0012] To ensure a filtering effect, the filtering circuit comprises: a first drive resistor (R1) and a first filter capacitor (C2); the output end of a digital Hall switch (U1), the first drive resistor (R1), the first filter capacitor (C2) and the first end of a first switch tube (Q1) are connected in sequence, and one end of the first filter capacitor (C2) connected to the first end of the first switch tube (Q1) is grounded.

[0013] The high-stability power supply control circuit of the capsule endoscope based on the Hall switch further includes: a first pull-down resistor (R2); one end of the first pull-down resistor (R2) is connected to the first end of the first switch tube, and the other end is grounded.

[0014] The high-stability power supply control circuit of the capsule endoscope based on the Hall switch further includes: a first pull-up resistor (R3); one end of the first pull-up resistor (R3) is connected to the power input end, and the other end is connected to the third end of the first switch tube.

[0015] As one of the specific implementation solutions, the digital Hall switch (U1) model is DRV5032.

[0016] A Hall effect switch is a device based on the Hall effect. Under the influence of an external magnetic field perpendicular to the Hall element, electrons will move to one side of the Hall element, causing a potential difference between the two sides and forming a Hall voltage. The Hall switch detects the Hall voltage to determine whether the magnetic field is approaching or moving away. In actual applications, other models can also be selected, but attention should be paid to whether the power consumption meets the requirements. This is not specifically limited here.

[0017] A capsule endoscope power supply system adopts the above-mentioned capsule endoscope high-stability power supply control circuit based on Hall switch, including: a capsule endoscope and a capsule storage box, the capsule endoscope is installed in the capsule storage box, and a magnet is provided in the capsule storage box, and the north and south pole directions of the magnet are perpendicular to the main body of the digital Hall switch.

[0018] When current flows through a conductor, if there is a magnetic field perpendicular to the current, an additional electric field will be generated in the conductor in a direction perpendicular to the magnetic field and current, resulting in a potential difference between the two ends of the conductor. This phenomenon is called the Hall effect, and the resulting potential difference is called the Hall potential difference.

[0019] The above-mentioned capsule storage box includes a box bottom and a box cover that match each other. The movable cover of the box cover is arranged on the box bottom. The box bottom is provided with an elastic accommodating groove with the same shape and size as the capsule endoscope shell, and the capsule endoscope is installed in the elastic accommodating groove; the box cover is provided with an embedding groove with the size and shape matching the magnet, and the magnet is embedded in the embedding groove.

[0020] In order to facilitate disassembly and assembly, the magnet is in the shape of a long strip and is movably embedded in the embedding groove. After use, the magnet can be recycled.

[0021] When the capsule endoscope is taken out of the storage box, the magnetic field decreases rapidly, and the magnetic flux density passing through the Hall switch also decreases rapidly. When it reaches the set threshold, the digital Hall switch outputs a high level, triggering the first switch tube to turn on, and then triggering the second switch tube to turn on. At this time, the power supply powers on the capsule endoscope through the second switch tube, and the capsule endoscope starts to work; conversely, when the capsule endoscope is placed in the storage box, the magnetic field increases rapidly, and the magnetic flux density passing through the Hall switch increases rapidly. When it reaches the set threshold, the digital Hall switch outputs a low level, so that the first switch tube does not meet the conduction conditions, so the first switch tube does not turn on, and the second switch tube does not turn on, and the capsule endoscope is powered off and shut down; when in use, the patient only needs to take the capsule endoscope out of the storage box, and no other operation is required to realize the capsule endoscope's non-sensing start-up. The patient can swallow it into the stomach for gastrointestinal examination, which greatly facilitates the patient's use.

[0022] In addition, decoupling capacitors and filter circuits can effectively filter out battery assembly or other unstable factors during production. At the same time, the decoupling capacitors are close to the digital Hall switch to provide local energy with minimal parasitic inductance. These measures will increase the reliability and stability of the low-power power control circuit.

[0023] The technologies not mentioned in this utility model are all referred to the existing technology.

[0024] The high-stability power supply control circuit and power supply system of the capsule endoscope based on the Hall switch of the utility model can effectively filter out unstable factors, and has low energy consumption, good stability and high reliability. When in use, the patient only needs to take the capsule endoscope out of the storage box, and the capsule endoscope can be turned on without any other operation. The patient can perform gastrointestinal examination after swallowing the capsule, which greatly facilitates the use of the patient. The operation is convenient, simple, stable and reliable, and the power utilization rate is improved. It is also easy to prepare and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the power supply system of the capsule endoscope;

[0026] Figure 2 This is the low-power power supply control circuit diagram of the utility model;

[0027] In the figure, 10 is the capsule shell, 1 is the power control module, 2 is the power supply, 3 is the capsule control module, 4 is the camera, and 5 is the capsule fill light; U1 is the digital Hall switch, C1 is the first decoupling capacitor, R1 and C2 form a filter circuit, R2 is the first pull-down resistor, Q1 is the first switch tube, R3 is the first pull-up resistor, R4 is the first current limiting resistor, and Q2 is the second switch tube. DETAILED DESCRIPTION

[0028] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0029] The directional words such as up and down, left and right, horizontal, vertical, top and bottom, inside and outside in this application are all based on the relative directions or positional relationships shown in the drawings and should not be understood as absolute limitations on this application.

[0030] Example 1

[0031] like Figure 2 As shown, a high-stability power supply control circuit for a capsule endoscope based on a Hall switch comprises: a power input terminal, a digital Hall switch (U1), a filter circuit, a first switch tube (Q1), a first current-limiting resistor (R4) and a second switch tube (Q2);

[0032] The power input end is connected to the input end of the digital Hall switch (U1); the output end of the digital Hall switch (U1), the filter circuit and the first end of the first switch tube (Q1) are connected in sequence; the second end of the first switch tube (Q1) is grounded; the third end of the first switch tube, the first current limiting resistor (R4) and the first end of the second switch tube are connected in sequence; the second end of the second switch tube is connected to the power input end; and the third end of the second switch tube is the power output end of the power control circuit.

[0033] Example 2

[0034] Based on Example 1, the following improvement is further made: the high-stability power supply control circuit for a capsule endoscope based on a Hall switch further includes: a first decoupling capacitor (C1); the input end of the digital Hall switch (U1), the first decoupling capacitor (C1), and the third end of the digital Hall switch (U1) are connected in sequence. That is, the first decoupling capacitor is connected in parallel to the input end and the third end of the digital Hall switch (U1).

[0035] Example 3

[0036] Based on Example 2, the following improvement is further made: the filter circuit includes: a first drive resistor (R1) and a first filter capacitor (C2); the output end of the digital Hall switch (U1), the first drive resistor (R1), the first filter capacitor (C2) and the first end of the first switch tube (Q1) are connected in sequence, and the end of the first filter capacitor (C2) connected to the first end of the first switch tube (Q1) is grounded.

[0037] Example 4

[0038] Based on Example 3, the following improvements are further made: the high-stability power supply control circuit of the capsule endoscope based on the Hall switch also includes: a first pull-down resistor (R2); one end of the first pull-down resistor (R2) is connected to the first end of the first switch tube, and the other end is grounded.

[0039] Example 5

[0040] Based on Example 4, the following improvement is further made: the high-stability power supply control circuit of the capsule endoscope based on the Hall switch also includes: a first pull-up resistor (R3); one end of the first pull-up resistor (R3) is connected to the power input end, and the other end is connected to the third end of the first switch tube.

[0041] A capsule endoscope power supply system adopts the above-mentioned high-stability power supply control circuit for capsule endoscope based on Hall switch, comprising: a capsule endoscope and a capsule storage box, the capsule storage box comprising a box bottom and a box cover that match each other, the box cover being movablely arranged on the box bottom, the box bottom being provided with an elastic accommodating groove having the same shape and matching size as the capsule endoscope shell, and the capsule endoscope being installed in the elastic accommodating groove; the box cover being provided with an engaging groove having the same size and shape as the magnet, and the magnet being movably engaged in the engaging groove, the magnet being in the shape of an elongated strip, and the north and south pole directions of the magnet being perpendicular to the main body of the digital Hall switch.

[0042] like Figure 1 As shown, the capsule endoscope includes a capsule shell 10, a magnet is implanted in the capsule storage box, and the capsule shell 10 contains a power control module 1, a power supply 2, a capsule control module 3, a camera 4 and a capsule fill light 5; wherein the power control module 1 adopts the above-mentioned high-stability power control circuit of the capsule endoscope based on the Hall switch, and the digital Hall switch is used to sense the magnetic field strength in the storage box. When the magnetic field strength is greater than or less than a preset threshold, that is, the storage box is placed in or taken out, the power control circuit is triggered to be turned off or on, thereby realizing the shutoff and supply of the power supply 2; it can be seen that in this embodiment, the capsule endoscope can be turned on by taking it out of the storage box, and can be turned off by putting it into the storage box.

[0043] Figure 2 This is a high-stability power supply control circuit for a capsule endoscope based on a Hall switch in this embodiment. When the capsule endoscope 10 is stored in a capsule storage box, due to the influence of the magnetic field of the magnet in the storage box, the magnetic flux density received by the ultra-low power digital switch Hall effect sensor U1 (model can be: DRV5032 or similar device) is greater than the set threshold. The digital Hall switch U1 continuously outputs a low level, and the first end of the first switch tube Q1 (NMOS) is at a low level. At this time, the Vgs of the first switch tube Q1 (NMOS) is less than Vgsth, and the first switch tube Q1 (NMOS) is not conducting. The third end of the first switch tube Q1 (NMOS) is connected to the pull-up resistor. At this time, the first end of the second switch tube Q2 (PMOS) is at a high level, and the Vgs of the second switch tube Q2 (PMOS) is greater than Vgsth. The second switch tube Q2 (PMOS) is not conducting, and the power supply cannot supply power to the capsule control module 3. At this time, the capsule endoscope has no power supply and is in a shutdown state.

[0044] When the capsule endoscope is taken out of the capsule storage box, since the capsule is away from the magnetic field in the storage box, the magnetic flux density received by the digital Hall switch U1 is less than the set threshold, and the digital Hall switch U1 continues to output a high level. The first end of the first switch tube Q1 (NMOS) is at a high level. At this time, the Vgs of the first switch tube Q1 (NMOS) is greater than Vgsth, the first switch tube Q1 (NMOS) is turned on, and the second end of the first switch tube Q1 (NMOS) is grounded, so that the first end of the second switch tube Q2 (PMOS) is at a low level, the Vgs of the second switch tube Q2 (PMOS) is less than Vgsth, the second switch tube Q2 is turned on, and the power supply 2 supplies power to the capsule control module 3 through the third end of the second switch tube Q2 (PMOS). At this time, the capsule endoscope is turned on and starts working.

[0045] The above-mentioned high-stability power supply control circuits and power supply systems of capsule endoscopes based on Hall switches can effectively filter out unstable factors, and have low energy consumption, good stability and high reliability. When in use, the patient only needs to take the capsule endoscope out of the storage box, and no other operation is required to realize the non-sensing startup of the capsule endoscope. The patient can perform gastrointestinal examination after swallowing it into the abdomen, which greatly facilitates the patient's use. The operation is convenient, simple, stable and reliable, and the power utilization rate is improved. It is also easy to prepare and low in cost.

Claims

1. A highly stable power supply control circuit for a capsule endoscope based on a Hall switch, characterized by: include: A power input terminal, a digital Hall switch (U1), a filter circuit, a first switch tube (Q1), a first current limiting resistor (R4) and a second switch tube (Q2); The power input end is connected to the input end of the digital Hall switch (U1); the output end of the digital Hall switch (U1), the filter circuit and the first end of the first switch tube (Q1) are connected in sequence; the second end of the first switch tube (Q1) is grounded; the third end of the first switch tube, the first current limiting resistor (R4) and the first end of the second switch tube are connected in sequence; the second end of the second switch tube is connected to the power input end; and the third end of the second switch tube is the power output end of the power control circuit.

2. The high-stability power supply control circuit for capsule endoscope based on Hall switch according to claim 1, characterized in that: Also includes: A first decoupling capacitor (C1); an input end of a digital Hall switch (U1), the first decoupling capacitor (C1) and a third end of the digital Hall switch (U1) are connected in sequence.

3. The high-stability power supply control circuit for capsule endoscope based on Hall switch according to claim 1 or 2, characterized in that: The filter circuit includes: a first driving resistor (R1) and a first filter capacitor (C2); The output end of the digital Hall switch (U1), the first driving resistor (R1), the first filter capacitor (C2) and the first end of the first switch tube (Q1) are connected in sequence, and one end of the first filter capacitor (C2) connected to the first end of the first switch tube (Q1) is grounded.

4. The high-stability power supply control circuit for capsule endoscope based on Hall switch according to claim 1 or 2, characterized in that: Also includes: A first pull-down resistor (R2); one end of the first pull-down resistor (R2) is connected to the first end of the first switch tube, and the other end is grounded.

5. The high-stability power supply control circuit for capsule endoscope based on Hall switch according to claim 1 or 2, characterized in that: Also includes: A first pull-up resistor (R3); one end of the first pull-up resistor (R3) is connected to the power input end, and the other end is connected to the third end of the first switch tube.

6. The high-stability power supply control circuit for capsule endoscope based on Hall switch according to claim 1 or 2, characterized in that: The digital Hall switch (U1) is DRV5032.

7. A capsule endoscope power supply system, using the capsule endoscope high-stability power supply control circuit based on a Hall switch according to any one of claims 1 to 6, characterized in that: include: A capsule endoscope and a capsule storage box, wherein the capsule endoscope is installed in the capsule storage box. A magnet is arranged in the capsule storage box, and the north and south pole directions of the magnet are perpendicular to the main body of the digital Hall switch.

8. The capsule endoscope power supply system according to claim 7, wherein: The capsule storage box includes a box bottom and a box cover that match each other. The movable cover of the box bottom is arranged on the box bottom. The box bottom is provided with an elastic accommodating groove with the same shape and size as the capsule endoscope shell, and the capsule endoscope is installed in the elastic accommodating groove; the box cover is provided with an embedding groove with the size and shape matching the magnet, and the magnet is embedded in the embedding groove.

9. The capsule endoscope power supply system according to claim 8, wherein: The magnet is in the shape of a long strip and is movably embedded in the embedding groove.

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