Power supply circuit of LED operating shadowless lamp and shadowless lamp

Abstract

The utility model relates to a power supply circuit of an LED operation shadowless lamp and a shadowless lamp, the power supply circuit of the LED operation shadowless lamp comprises a controller, a capacitive reactance circuit, a first fuse, a comparison output circuit, an IC unit, a first inductor and a diode, the first fuse, the capacitive reactance circuit and the controller are connected in sequence, and the comparison output circuit is connected with the comparison output circuit. Two ends of the diode are respectively connected with two pins of the controller, the first inductor is connected with the diode and the comparison output circuit, an output end of the comparison output circuit is connected with the IC unit, and one end of the capacitive reactance circuit and one end of the diode are grounded, so that the brightness of the shadowless lamp can be accurately adjusted; and the IC unit capable of eliminating stroboflash can effectively adjust the PWM output frequency and ensure stable light output. Through the first fuse and the capacitive reactance circuit, protection is provided when overload or other faults occur in the circuit, and equipment is prevented from being damaged.

Description

Technical Field

[0001] The present application relates to the field of shadowless lamps, and in particular, to a power supply circuit and a shadowless lamp for an LED surgical shadowless lamp. Background Art

[0002] The brightness and shadowlessness of shadowless lamps are directly related to surgical quality and patient health. Traditional methods, which manually adjust the brightness based on the operator's comfort level, are difficult to accurately guarantee and can easily pollute the surgical environment, disrupting the normal operation. During surgery, the surgeon's body, head, hands, and instruments can obstruct the surgical area, creating shadows that, if not promptly eliminated, can compromise surgical quality.

[0003] Currently, shadowless lamps have flickering problems, so the MCU needs to select a model with multiple PWM outputs. If the MCU's PWM interface is directly used for digital dimming, the output frequency will not be appropriate. Utility Model Content

[0004] The purpose of the present application is to provide a power supply circuit and a shadowless lamp for an LED surgical operating lamp, so as to solve the problems of flickering of the shadowless lamp and inappropriate output frequency of the PWM interface dimming.

[0005] In order to solve the above problems, this application adopts the following technical solutions:

[0006] The present application provides a power supply circuit for an LED surgical shadowless lamp, comprising: a controller, a capacitive reactance circuit, a first fuse, a comparison output circuit, an IC unit, a first inductor and a diode. The first fuse, the capacitive reactance circuit and the controller are connected in sequence, the two ends of the diode are respectively connected to the two pins of the controller, the first inductor is connected to the diode and the comparison output circuit, the output end of the comparison output circuit is connected to the IC unit, and one end of the capacitive reactance circuit and one end of the diode are both grounded.

[0007] Furthermore, the power supply circuit of the LED shadowless surgical lamp includes a second fuse, one end of the second fuse is connected to electricity, and the other end of the second fuse is connected to the connection port.

[0008] Furthermore, the capacitive reactance circuit includes a first capacitor and a second capacitor, one end of the first capacitor and one end of the second capacitor are both connected to the same pin of the controller, and the other end of the first capacitor and the other end of the second capacitor are both grounded.

[0009] Furthermore, the first capacitor and the second capacitor have different capacitance values.

[0010] Furthermore, the power supply circuit of the LED surgical shadowless lamp includes a third capacitor and a fourth capacitor, one end of the third capacitor and one end of the fourth capacitor are both connected to the first inductor, and the other end of the third capacitor and the other end of the fourth capacitor are both grounded.

[0011] Furthermore, the comparison output circuit includes a comparator, a first resistor and a second resistor, one end of the first resistor is connected to the first inductor, the other end of the first resistor is connected to the positive end of the comparator, one end of the second resistor is connected to the negative end of the comparator, the other end of the second resistor is grounded, and the output end of the comparator is connected to the IC unit.

[0012] Furthermore, the comparison output circuit includes a fifth capacitor, one end of the fifth capacitor is connected to the first inductor, and the other end of the fifth capacitor is grounded.

[0013] Furthermore, there are multiple comparators, and the multiple comparators are arranged side by side.

[0014] The present application also provides a shadowless lamp, comprising: a shell with a receiving cavity formed therein, and a power supply circuit of any of the above-mentioned LED surgical shadowless lamps, which is arranged in the shell.

[0015] Compared with the prior art, the present invention has the following advantages: Because the two ends of the diode are connected to two pins of the controller, the first inductor is connected to the diode and the comparison output circuit, and the output end of the comparison output circuit is connected to the IC unit, the brightness of the shadowless lamp can be precisely adjusted, and the IC unit can effectively adjust the PWM output frequency to ensure stable light output. The first fuse and the capacitive reactance circuit provide protection against circuit overload or other faults, preventing damage to the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a power supply circuit for an LED shadowless surgical lamp provided in an embodiment of the present application.

[0017] Description of reference numerals:

[0018] 100, controller; 200, capacitive reactance circuit; 210, first capacitor; 220, second capacitor; 300, first fuse; 400, comparison output circuit; 410, comparator; 420, first resistor; 430, second resistor; 440, fifth capacitor; 500, IC unit; 600, first inductor; 700, diode; 800, second fuse; 900, third capacitor; 1000, fourth capacitor. DETAILED DESCRIPTION

[0019] The specific implementation methods of this application are described in detail below with reference to the accompanying drawings.

[0020] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0021] It should be understood that the orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings. These orientation terms are only used to facilitate the description of this application and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting this application.

[0022] There is flicker in the shadowless lamps on the market, and the MCU needs to select a model with multiple PWM outputs. If the MCU's PWM interface is directly used for digital dimming, the output frequency is not appropriate. At the same time, there are not enough MCU PWM output ports. Therefore, this application uses limited PWM output combined with a comparator circuit to convert it into a multi-channel analog dimming mode for control.

[0023] Figure 1 A schematic diagram of a power supply circuit for an LED surgical shadowless lamp provided in an embodiment of the present application is shown as follows: Figure 1 As shown, an embodiment of the present application provides a power supply circuit for an LED surgical shadowless lamp, including: a controller 100, a capacitive reactance circuit 200, a first fuse 300, a comparison output circuit 400, an IC unit 500, a first inductor 600 and a diode 700. The first fuse 300, the capacitive reactance circuit 200 and the controller 100 are connected in sequence, the two ends of the diode 700 are respectively connected to the two pins of the controller 100, the first inductor 600 is connected to the diode 700 and the comparison output circuit 400, the output end of the comparison output circuit 400 is connected to the IC unit 500, and one end of the capacitive reactance circuit 200 and one end of the diode 700 are both grounded.

[0024] Specifically, the controller 100 is connected to the capacitive reactance circuit 200 to ensure current stability and reduce flicker problems. The first fuse 300 is installed in the circuit to protect the circuit from overcurrent damage. The capacitive reactance circuit 200 takes into account power supply voltage fluctuations, load changes and frequency response. The diode 700 is properly installed between the two pins of the controller 100 to protect the controller from reverse voltage damage. The first inductor 600 needs to be connected between the diode 700 and the comparison output circuit 400 to filter out high-frequency noise in the PWM signal. The output end of the comparison output circuit 400 should be connected to the IC unit 500 to compare the analog signal with the set threshold to adjust the duty cycle of the PWM signal. To ensure the stability and safety of the circuit, one end of the capacitive reactance circuit 200, one end of the diode 700, and the ground pins of the controller 100 and the comparison output circuit 400 should all be grounded.

[0025] Because the two ends of diode 700 are connected to two pins of controller 100, first inductor 600 is connected to diode 700 and comparison output circuit 400, and the output of comparison output circuit 400 is connected to IC unit 500, the brightness of the shadowless lamp can be precisely adjusted, and IC unit 500, which eliminates flicker, effectively adjusts the PWM output frequency to ensure stable lighting output. First fuse 300 and capacitive reactance circuit 200 provide protection against circuit overloads or other faults, preventing damage to the device.

[0026] In some embodiments, the power supply circuit of the LED shadowless surgical lamp includes a second fuse 800 , one end of the second fuse 800 is connected to electricity, and the other end of the second fuse 800 is connected to the connection port.

[0027] Specifically, one end of the second fuse 800 is connected to the power supply electrode, and the other end is connected to the connection port to ensure circuit safety and prevent safety issues caused by overload or short circuit. For example, the second fuse 800 is a fuse with a rated current of 100A. One end of the second fuse 800 and one end of the first fuse 300 are both connected to power, and the other end of the second fuse 800 is connected to the connection port, protecting the connection port from damage caused by overload current and ensuring the stability and reliability of the connection port.

[0028] By introducing the second fuse 800, the safety of the circuit is significantly improved. When a short circuit or overload occurs in the circuit, the second fuse 800 will quickly melt and cut off the power supply, thereby preventing fire or other safety problems.

[0029] In some embodiments, the capacitive reactance circuit includes a first capacitor 210 and a second capacitor 220, one end of the first capacitor 210 and one end of the second capacitor 220 are connected to the same pin of the controller 100, and the other end of the first capacitor 210 and the other end of the second capacitor 220 are both grounded.

[0030] Specifically, one end of the first capacitor 210 and one end of the second capacitor 220 are respectively connected to the same pin of the controller 100 to ensure a firm connection and good electrical contact. For example, the first capacitor 210 and the second capacitor 220 are both ceramic capacitors, which have characteristics suitable for high-frequency applications. The other ends of the first capacitor 210 and the second capacitor 220 are both grounded to form a capacitive reactance network. The pins of the controller 100 are connected to the first capacitor 210 and the second capacitor 220 to achieve capacitive reactance adjustment. In particular, the capacitance values of the first capacitor 210 and the second capacitor 220 are different. For example, the capacitance value of the first capacitor 210 is 30μF, and the capacitance value of the second capacitor 220 is 10μF. It should be noted that the first capacitor 210 and the second capacitor 220 should be adapted according to the frequency characteristics and control requirements of the shadowless lamp.

[0031] The capacitive reactance circuit 200 composed of the first capacitor 210 and the second capacitor 220 is used to optimize the response speed and stability of the circuit, thereby effectively reducing the stroboscopic phenomenon of the shadowless lamp, improving the control accuracy, and enhancing the lighting quality of the surgical environment.

[0032] In some embodiments, the power supply circuit of the LED surgical shadowless lamp includes a third capacitor 900 and a fourth capacitor 1000, one end of the third capacitor 900 and one end of the fourth capacitor 100 are both connected to the first inductor 600, and the other end of the third capacitor 900 and the other end of the fourth capacitor 1000 are both grounded.

[0033] Specifically, one end of the third capacitor 900 and one end of the fourth capacitor 1000 are both connected to the first inductor 600 to form an LC filter. The LC filter filters the signal after passing through the controller 100. The third capacitor 900 and the fourth capacitor 1000 filter different components, further improving the filtering effect of the power supply circuit and reducing the impact of noise on the LED surgical shadowless lamp. It should be noted that the capacitance of the third capacitor 900 and the fourth capacitor 1000 needs to be matched according to actual needs to achieve the best filtering effect.

[0034] In some embodiments, the comparison output circuit 400 includes a comparator 410, a first resistor 420 and a second resistor 430, one end of the first resistor 420 is connected to the first inductor 600, the other end of the first resistor 420 is connected to the positive end of the comparator 410, one end of the second resistor 430 is connected to the negative end of the comparator 420, the other end of the second resistor 430 is grounded, and the output end of the comparator 410 is connected to the IC unit 500.

[0035] Specifically, one end of the first resistor 420 of the comparison output circuit 400 is connected to the first inductor 600, and the other end of the first resistor 420 is connected to the positive terminal of the comparator 410. The first resistor 420 effectively limits the current. One end of the second resistor 430 is connected to the negative terminal of the comparator 410, and one end of the second resistor 430 is grounded. The output of the comparator 410 is connected to the IC unit 500, which transmits the comparison result to the IC unit 500, and accurately controls the LED surgical shadowless light based on the comparison result. It should be noted that other overload protection, short-circuit protection, and other components can be provided between the LED surgical shadowless light and the comparison output circuit 400 to prevent damage to the device due to excessive current or short circuits. In particular, there can be multiple comparators 410, and multiple comparators 410 are arranged side by side. For example, the comparison output circuit 400 is provided with three comparators 410.

[0036] In some embodiments, the comparison output circuit 400 includes a fifth capacitor 440 , one end of which is connected to the first inductor 600 , and the other end of which is grounded. Specifically, one end of the fifth capacitor 440 is connected to the first inductor 600 , the fifth capacitor 440 is connected to a power supply (VIN), and the other end of the fifth capacitor 440 is grounded, effectively filtering out noise. Because the fifth capacitor 440 is located before the comparator 410 , it can work together with the first inductor 600 to effectively filter out high-frequency noise and interference from the signal entering the comparator 410, thereby improving signal quality.

[0037] The present application also provides a shadowless lamp, comprising: a shell with a receiving cavity formed therein, and any one of the control circuits for the shadowless lamp described above, which is arranged in the shell.

[0038] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present application.

Claims

1. A power supply circuit for an LED shadowless surgical lamp, characterized in that: include: A controller, a capacitive reactance circuit, a first fuse, a comparison output circuit, an IC unit, a first inductor and a diode, wherein the first fuse, the capacitive reactance circuit and the controller are connected in sequence, the two ends of the diode are respectively connected to the two pins of the controller, the first inductor is connected to the diode and the comparison output circuit, the output end of the comparison output circuit is connected to the IC unit, one end of the capacitive reactance circuit and one end of the diode are both grounded, the comparison output circuit includes a comparator, a first resistor and a second resistor, one end of the first resistor is connected to the first inductor, the other end of the first resistor is connected to the positive end of the comparator, one end of the second resistor is connected to the negative end of the comparator, the other end of the second resistor is grounded, and the output end of the comparator is connected to the IC unit.

2. The power supply circuit of the LED shadowless surgical lamp according to claim 1, characterized in that: The power supply circuit of the LED shadowless surgical lamp includes a second fuse, one end of the second fuse is connected to electricity, and the other end of the second fuse is connected to the connection port.

3. The power supply circuit of the LED shadowless surgical lamp according to claim 1, characterized in that: The capacitive reactance circuit includes a first capacitor and a second capacitor, one end of the first capacitor and one end of the second capacitor are both connected to the same pin of the controller, and the other end of the first capacitor and the other end of the second capacitor are both grounded.

4. The power supply circuit of the LED shadowless surgical lamp according to claim 3, characterized in that: The first capacitor and the second capacitor have different capacitance values.

5. The power supply circuit of the LED shadowless surgical lamp according to claim 1, characterized in that: The power supply circuit of the LED surgical shadowless lamp includes a third capacitor and a fourth capacitor, one end of the third capacitor and one end of the fourth capacitor are both connected to the first inductor, and the other end of the third capacitor and the other end of the fourth capacitor are both grounded.

6. The power supply circuit of the LED shadowless surgical lamp according to claim 1, characterized in that: The comparison output circuit includes a fifth capacitor, one end of the fifth capacitor is connected to the first inductor, and the other end of the fifth capacitor is grounded.

7. The power supply circuit of the LED shadowless surgical lamp according to claim 1, characterized in that: There are multiple comparators, and the multiple comparators are arranged side by side.

8. A shadowless lamp, characterized in that: include: A shell having an accommodating cavity formed therein, and a power supply circuit for the LED surgical shadowless lamp according to any one of claims 1 to 7, are arranged in the shell.

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