LED switch circuit of bronchial electronic endoscope

Abstract

The utility model discloses a LED switch circuit of bronchial electronic endoscope, including LED lamp drive chip U1, LED lamp group, maximum LED drive current configuration resistance R1 and LED working current adjusting resistance R2, the control signal input foot of LED lamp drive chip U1 is connected with single line digital signal interface, the power supply foot of LED lamp drive chip U1 is connected with the foot of LED working current adjusting resistance R2 and power supply anode network, the foot of LED working current adjusting resistance R2 is connected with the anode of LED lamp group, the LED input foot of LED lamp drive chip U1 is connected with the cathode of LED lamp group, the maximum LED drive current configuration foot of LED lamp drive chip U1 is connected with the foot of maximum LED drive current configuration resistance R1. The utility model effectively solved the problem that bronchial electronic endoscope cannot close light and lead to lens cleaning inconvenient and interfere with mirror image sensor test.

Description

Technical Field

[0001] This utility model relates to the field of bronchial electronic endoscope technology, specifically to an LED switch circuit for a bronchial electronic endoscope. Background Technology

[0002] As an important medical device, the electronic bronchoscope plays an irreplaceable role. It can penetrate deep into the bronchi, providing doctors with intuitive and clear images of the bronchial interior, thereby assisting doctors in accurate diagnosis and effective treatment.

[0003] Currently, the lights on most mainstream bronchial electronic endoscopes on the market are usually always on, making it impossible to turn them off. This situation causes many inconveniences: on the one hand, when users need to clean the endoscope lens, the bright LED light makes it impossible for users to look directly at the lens during cleaning, greatly affecting the convenience of cleaning; on the other hand, when verifying and testing the optical parameters of the endoscope's image sensor, the bright LED light nearby will interfere with the test. In order to obtain accurate test data, the LED light needs to be turned off, but existing technology cannot meet this requirement. Utility Model Content

[0004] In order to overcome the problems of existing bronchial electronic endoscopes, such as the inability to turn off the light, which makes lens cleaning inconvenient and interferes with the testing of the endoscope's image sensor, this utility model provides an LED switch circuit for a bronchial electronic endoscope.

[0005] The technical solution of this utility model is as follows:

[0006] An LED switching circuit for a bronchial electronic endoscope includes an LED driver chip U1, an LED lamp group, a maximum LED drive current configuration resistor R1, and an LED operating current adjustment resistor R2. The control signal input pin of the LED driver chip U1 is connected to a single-wire digital signal interface. The power supply pin of the LED driver chip U1 is connected to one pin of the LED operating current adjustment resistor R2 and the positive power supply network. One pin of the LED operating current adjustment resistor R2 is connected to the positive terminal of the LED lamp group. The LED input pin of the LED driver chip U1 is connected to the negative terminal of the LED lamp group. The maximum LED drive current configuration pin of the LED driver chip U1 is connected to one pin of the maximum LED drive current configuration resistor R1. The ground pin of the LED driver chip U1 and the other pin of the maximum LED drive current configuration resistor R1 are both connected to the working ground network.

[0007] As a preferred embodiment of this utility model, the LED lamp group includes LED lamps D1 and D2 connected in parallel. The positive terminals of LED lamp D1 and LED lamp D2 are both connected to one pin of the LED operating current regulating resistor R2. The negative terminals of LED lamp D1 and LED lamp D2 are respectively connected to the first LED input pin and the second LED input pin of the LED lamp driver chip U1.

[0008] As a preferred embodiment of this utility model, it also includes a bidirectional TVS tube TVS1, one pin of which is connected to the control signal input pin of the LED driver chip U1, and the other pin of which is connected to the working ground network.

[0009] As a preferred embodiment of this utility model, it also includes a bidirectional TVS tube TVS2, one pin of which is connected to the maximum LED drive current configuration pin of the LED driver chip U1, and the other pin of which is connected to the working ground network.

[0010] As a preferred embodiment of this utility model, it also includes a bidirectional TVS tube (TVS3), one leg of which is connected to the positive electrode of the LED light group, and the other leg of which is connected to the working ground network.

[0011] As a preferred embodiment of this utility model, it also includes a bidirectional TVS tube TVS4, one pin of which is connected to the LED input pin of the LED driver chip U1, and the other pin of which is connected to the working ground network.

[0012] As a preferred embodiment of this utility model, it also includes a bidirectional TVS tube (TVS5), one pin of which is connected to the power supply pin of the LED driver chip U1, and the other pin of which is connected to the working ground network.

[0013] As a preferred embodiment of this utility model, it also includes an electrostatic discharge resistor R3, one leg of which is connected to the power supply pin of the LED driver chip U1, and the other leg of which is connected to the working ground network.

[0014] As a preferred embodiment of this utility model, it also includes a bypass capacitor bank, one pin of which is connected to the power supply pin of the LED driver chip U1, and the other pin of which is connected to the working ground network.

[0015] As a preferred embodiment of this utility model, the bypass capacitor group includes bypass capacitor C1, bypass capacitor C2 and bypass capacitor C3. One pin of each of the bypass capacitors C1, C2 and C3 is connected to the power supply pin of the LED driver chip U1, and the other pin of each of the bypass capacitors C1, C2 and C3 is connected to the working ground network.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. By receiving control signals from the single-wire digital signal interface through the LED driver chip U1, the LED driver current output can be flexibly turned on or off, thereby controlling the on and off of the LED light. This effectively solves the problem that the bronchial electronic endoscope cannot turn off the light, which leads to inconvenient lens cleaning and interference with the endoscope image sensor test.

[0018] 2. By connecting a bidirectional TVS diode in parallel between each network of the circuit and the working ground network GND, the damage to electronic components in the circuit caused by electrostatic discharge can be effectively prevented, the anti-static interference capability of the circuit can be improved, and the stable operation of the equipment can be guaranteed.

[0019] 3. By setting an electrostatic discharge resistor R3, the electrostatic charge that interferes with this circuit can be discharged more quickly, reducing the accumulation of static electricity in the circuit and reducing the risk of damage to electronic components by static electricity.

[0020] 4. By setting up bidirectional TVS tubes, discharge resistors and bypass capacitor banks, the ESD protection capability of the circuit can be increased, enabling the bronchial electronic endoscope system to reach the ESD4 (contact discharge ±8KV, air discharge ±15KV) protection level, thus avoiding damage to electronic components.

[0021] 5. The overall circuit structure is simple, the number of components used is small, and the cost of electronic components is low. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a circuit diagram of an LED switch circuit for a bronchial electronic endoscope according to one embodiment of the present invention. Detailed Implementation

[0024] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. It is also declared that the embodiments described below are only for explaining this utility model and are not intended to limit this utility model.

[0025] It should be noted that the term "connection" and similar terms should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection of two components or the interaction between two components, unless otherwise explicitly defined. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of technical features.

[0026] Please see Figure 1 This utility model provides an LED switch circuit for a bronchial electronic endoscope, including an LED driver chip U1, an LED lamp group, a maximum LED drive current configuration resistor R1, and an LED operating current adjustment resistor R2. The control signal input pin CTL of the LED driver chip U1 is connected to a single-wire digital signal interface. The power supply pin VIN of the LED driver chip U1 is connected to one pin of the LED operating current adjustment resistor R2 and the 3.3V positive power supply network. One pin of the LED operating current adjustment resistor R2 is connected to the positive terminal of the LED lamp group. The LED input pin of the LED driver chip U1 is connected to the negative terminal of the LED lamp group. The maximum LED drive current configuration pin ISET of the LED driver chip U1 is connected to one pin of the maximum LED drive current configuration resistor R1. The ground pin GND of the LED driver chip U1 and the other pin of the maximum LED drive current configuration resistor R1 are both connected to the operating ground network GND. The maximum LED drive current configuration resistor R1 is used to set the maximum current value for driving the LED in this circuit. This prevents the LED from being damaged due to excessive current, extends the LED's lifespan, and also protects other electronic components in the circuit, improving the overall reliability and stability of the circuit. The LED operating current adjustment resistor R2 is used to adjust the operating current driving the LED. Different operating currents affect the brightness and luminous effect of the LED. By adjusting the operating current, the brightness of the LED can be flexibly adjusted according to the actual usage scenario and needs, meeting diverse application requirements.

[0027] During operation, the LED driver chip U1 receives the control signal CONTRAL from the single-wire digital signal interface via the control signal input pin CTL. Based on the CONTRAL signal, the driver chip turns the LED drive current output on / off, thus flexibly turning the LED light of the bronchial electronic endoscope on and off. For example, when the control signal CONTRAL received by the LED driver chip U1 via the control signal input pin CTL is a constant low level (0V), the driver chip turns off the LED drive current output to turn off the LED light; when the control signal CONTRAL received by the LED driver chip U1 via the control signal input pin CTL is a constant high level (greater than 0V), the driver chip turns on the LED drive current output to drive the LED light in a constant current manner, thus turning on the LED light. When cleaning the lens of the bronchial electronic endoscope, simply sending a constant low-level control signal via the single-wire digital signal interface turns off the LED light, allowing the user to directly view the lens for detailed cleaning, improving cleaning efficiency and effectiveness, and ensuring the imaging quality of the equipment. When verifying the optical parameters of the image sensor of the test mirror, simply sending a constant low-level control signal through a single-wire digital signal interface will turn off the LED, creating an interference-free environment for testing and ensuring accurate test data acquisition, which helps improve the accuracy of product quality and performance evaluation.

[0028] In one embodiment, the LED driver inside the LED driver chip U1 is programmed and controlled by a single-wire digital interface to adjust the brightness of the LED light in 32 linear levels, which can provide a more precise brightness adjustment range. The method of adjusting the light brightness is simple, which can be achieved by sending the corresponding control signal through the single-wire digital interface without complicated operation steps. This allows doctors to quickly adjust the light brightness during surgery or examination, thereby improving work efficiency.

[0029] Please see Figure 1 In one embodiment, the LED light group includes LEDs D1 and D2 connected in parallel. The positive terminals of both LEDs D1 and D2 are connected to one pin of the LED operating current regulating resistor R2. The negative terminals of both LEDs D1 and D2 are connected to the first and second LED input pins of the LED driver chip U1, respectively. Using LEDs D1 and D2 in parallel provides higher brightness, meeting the brightness requirements of the bronchial electronic endoscope in different usage scenarios. Furthermore, when one LED fails, the other LED can still function normally, improving the reliability of the LED light group and reducing the risk of equipment malfunction due to the failure of a single LED.

[0030] Please see Figure 1In one embodiment, the LED switching circuit further includes bidirectional TVS transistors TVS1, TVS2, TVS3, TVS4, and TVS5. One pin of TVS1 is connected to the control signal input pin CTL of the LED driver chip U1, one pin of TVS2 is connected to the maximum LED drive current configuration pin ISET of the LED driver chip U1, one pin of TVS3 is connected to the positive terminal of the LED group, one pin of TVS4 is connected to the LED input pin of the LED driver chip U1, and one pin of TVS5 is connected to the power supply pin VIN of the LED driver chip U1. The other pins of TVS1, TVS2, TVS3, TVS4, and TVS5 are all connected to the working ground network GND. By connecting a bidirectional TVS diode in parallel between each network of the circuit and the ground network GND, when an electrostatic interference signal is applied to any network of the circuit, the electrostatic energy will be immediately absorbed by the bidirectional TVS on the circuit network. This effectively prevents electrostatic discharge from damaging the electronic components in the circuit, improves the circuit's anti-electrostatic interference capability, and ensures the stable operation of the equipment.

[0031] Please see Figure 1 In one embodiment, the LED switching circuit further includes an electrostatic discharge (ESD) resistor R3. One pin of the ESD resistor R3 is connected to the power supply pin VIN of the LED driver chip U1, and the other pin is connected to the ground network GND. The ESD resistor R3 is used to accelerate the discharge of electrostatic discharge that interferes with the circuit. When an ESD interference signal enters the circuit, the ESD resistor R3 provides a low-impedance path, allowing the electrostatic discharge to be quickly discharged to the ground network GND, thereby reducing the accumulation of static electricity in the circuit and lowering the risk of damage to electronic components.

[0032] Please see Figure 1 In one embodiment, a bypass capacitor bank is also included. One pin of the bypass capacitor bank is connected to the power supply pin VIN of the LED driver chip U1, and the other pin is connected to the working ground network GND. The bypass capacitor bank is used to suppress low-frequency and high-frequency interference signals, including radio frequency interference signals generated by ESD air discharge, increasing the ESD protection capability of the circuit, enabling the bronchial electronic endoscope system to reach the ESD4 (contact discharge ±8KV, air discharge ±15KV) protection level, and avoiding damage to electronic components.

[0033] Specifically, the bypass capacitor group includes bypass capacitors C1, C2, and C3. One pin of each of bypass capacitors C1, C2, and C3 is connected to the power supply pin VIN of the LED driver chip U1, and the other pin is connected to the ground network GND. The combination of bypass capacitors C1, C2, and C3 can better cover interference signals in different frequency ranges, improve the suppression effect of interference signals, and further enhance the stability and reliability of the circuit.

[0034] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

[0035] The present utility model patent has been described above with reference to the accompanying drawings. Obviously, the implementation of the present utility model patent is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present utility model patent, or the direct application of the inventive concept and technical solution of the present utility model patent to other occasions without modification, are all within the protection scope of the present utility model.

Claims

1. An LED switch circuit for a bronchial electronic endoscope, characterized in that, The system includes an LED driver chip U1, an LED lamp group, a maximum LED drive current configuration resistor R1, and an LED operating current adjustment resistor R2. The control signal input pin of the LED driver chip U1 is connected to a single-wire digital signal interface. The power supply pin of the LED driver chip U1 is connected to one pin of the LED operating current adjustment resistor R2 and the positive power supply network. One pin of the LED operating current adjustment resistor R2 is connected to the positive terminal of the LED lamp group. The LED input pin of the LED driver chip U1 is connected to the negative terminal of the LED lamp group. The maximum LED drive current configuration pin of the LED driver chip U1 is connected to one pin of the maximum LED drive current configuration resistor R1. The ground pin of the LED driver chip U1 and the other pin of the maximum LED drive current configuration resistor R1 are both connected to the working ground network.

2. The LED switch circuit of the bronchial electronic endoscope according to claim 1, characterized in that, The LED light group includes LEDs D1 and D2 connected in parallel. The positive terminals of both LEDs D1 and D2 are connected to one pin of the LED operating current regulating resistor R2. The negative terminals of both LEDs D1 and D2 are connected to the first LED input pin and the second LED input pin of the LED driver chip U1, respectively.

3. The LED switch circuit of the bronchial electronic endoscope according to claim 1, characterized in that, It also includes a bidirectional TVS tube TVS1, one pin of which is connected to the control signal input pin of the LED driver chip U1, and the other pin of which is connected to the working ground network.

4. The LED switch circuit of the bronchial electronic endoscope according to claim 1, characterized in that, It also includes a bidirectional TVS diode TVS2, one pin of which is connected to the maximum LED drive current configuration pin of the LED driver chip U1, and the other pin of the bidirectional TVS diode TVS2 is connected to the working ground network.

5. The LED switch circuit of the bronchial electronic endoscope according to claim 1, characterized in that, It also includes a bidirectional TVS tube (TVS3), one leg of which is connected to the positive terminal of the LED light group, and the other leg of which is connected to the working ground network.

6. The LED switch circuit of the bronchial electronic endoscope according to claim 1, characterized in that, It also includes a bidirectional TVS diode TVS4, one pin of which is connected to the LED input pin of the LED driver chip U1, and the other pin of which is connected to the working ground network.

7. The LED switch circuit of the bronchial electronic endoscope according to claim 1, characterized in that, It also includes a bidirectional TVS diode TVS5, one pin of which is connected to the power supply pin of the LED driver chip U1, and the other pin of which is connected to the working ground network.

8. The LED switch circuit of the bronchial electronic endoscope according to claim 1, characterized in that, It also includes an electrostatic discharge resistor R3, one leg of which is connected to the power supply pin of the LED driver chip U1, and the other leg of which is connected to the working ground network.

9. The LED switch circuit of the bronchial electronic endoscope according to claim 1, characterized in that, It also includes a bypass capacitor bank, one pin of which is connected to the power supply pin of the LED driver chip U1, and the other pin of which is connected to the working ground network.

10. The LED switch circuit of the bronchial electronic endoscope according to claim 9, characterized in that, The bypass capacitor group includes bypass capacitor C1, bypass capacitor C2 and bypass capacitor C3. One pin of each of the bypass capacitors C1, C2 and C3 is connected to the power supply pin of the LED driver chip U1, and the other pin of each of the bypass capacitors C1, C2 and C3 is connected to the working ground network.

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