Medical lighting control circuit and lighting equipment

Abstract

The utility model relates to a medical lighting control circuit and lighting equipment, the medical lighting control circuit comprises a control chip, an RC circuit, an adjustable resistor, a first inductor and a light emitting diode, the adjustable resistor is connected with the control chip, the light emitting diode is connected to the lighting equipment, and the first inductor is connected with the control chip. Two pins of the control chip are respectively connected with a signal input and a PWM (Pulse Width Modulation) signal, the control chip, the first inductor, the RC circuit and the light emitting diode are sequentially connected, and one end of the adjustable resistor and one end of the RC circuit are grounded. Through the control chip, the RC circuit and the adjustable resistor, electromagnetic interference (EMI) is effectively inhibited, the possibility that the lighting equipment is influenced by an external electromagnetic field is reduced, stable work of the lighting equipment is ensured, the control chip accurately adjusts the brightness of the lighting equipment, and the accuracy of the brightness is improved.

Description

Technical Field

[0001] The present application relates to the field of shadowless lamps, and in particular, to a control circuit and lighting equipment for medical lighting. Background Art

[0002] In medical lighting equipment, lighting performance directly impacts surgical outcomes. Lighting control for shadowless lamps is particularly crucial, as performance, such as brightness and shadowlessness, is directly linked to surgical quality and patient health. Traditional methods manually adjust lighting based on the operator's comfort level, making it difficult to accurately guarantee brightness and easily polluting the surgical environment, disrupting the procedure. 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, medical lighting equipment (shadowless lamps) have flickering characteristics, and the driving circuit is easily affected and interfered by EMI. Utility Model Content

[0004] The purpose of this application is to provide a control circuit and lighting equipment for medical lighting to solve the problem that shadowless lamps have stroboscopic effects and the driving circuit is easily affected and interfered by EMI.

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

[0006] The present application provides a control circuit for medical lighting, comprising: a control chip, an RC circuit, an adjustable resistor, a first inductor and a light-emitting diode, wherein the adjustable resistor is connected to the control chip, the light-emitting diode is connected to a lighting device, two pins of the control chip are respectively connected to a signal input and a PWM signal, the control chip, the first inductor, the RC circuit and the light-emitting diode are connected in sequence, and one end of the adjustable resistor and one end of the RC circuit are both grounded.

[0007] Furthermore, the RC circuit includes a first resistor and a first capacitor, the first inductor, the first resistor and the light-emitting diode are connected in sequence, one end of the first capacitor is grounded, and the other end of the first capacitor is connected to the first resistor.

[0008] Furthermore, the control circuit of the medical lighting includes a second capacitor, one end of the second capacitor is connected to a pin of the control chip, and the other end of the second capacitor is connected to the first inductor.

[0009] Furthermore, the control circuit of the medical lighting includes a third capacitor, one end of the third capacitor is connected to the signal input, and the other end of the third capacitor is grounded.

[0010] Furthermore, the control circuit of the medical lighting includes a fourth capacitor, one end of the fourth capacitor is connected to the VCC pin of the control chip, and the other end of the fourth capacitor is grounded.

[0011] Furthermore, the capacitance value of the fourth capacitor is consistent with that of the third capacitor.

[0012] Furthermore, the control circuit of the medical lighting includes a second resistor, one end of the second resistor is connected to the VCC pin of the control chip, and the other end of the second resistor is connected to the adjustable resistor.

[0013] Furthermore, the number of the light emitting diodes is two, and the two light emitting diodes are arranged in series.

[0014] The present application also provides a lighting device, comprising: a shell with a receiving cavity formed therein, and a control circuit for medical lighting as described in any one of the above items, which is arranged in the shell.

[0015] Compared with the existing technology, the beneficial effects of this application are: the control circuit structure is simple and easy to operate, while having good stability and easy maintenance. At the same time, through the control chip, RC circuit and adjustable resistor, electromagnetic interference (EMI) is effectively suppressed, the possibility of lighting equipment being affected by external electromagnetic fields is reduced, and the stable operation of the lighting equipment is ensured. The control chip accurately adjusts the brightness of the lighting equipment and improves the accuracy of the brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a control circuit for medical lighting provided in an embodiment of the present application.

[0017] Description of reference numerals:

[0018] 100, control chip; 200, RC circuit; 210, first resistor; 220, first capacitor; 300, adjustable resistor; 400, first inductor; 500, light-emitting diode; 600, second capacitor; 700, third capacitor; 800, fourth capacitor; 900, second resistor. 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] Some lighting equipment (shadowless lamps) on the market suffer from flickering, high lamp head temperatures, and control boxes susceptible to interference from external high-current devices. Directly using the MCU's PWM interface for digital dimming, the buck constant-current chip used has a limited heat dissipation area. Some manufacturers' control boxes directly use TTL signals for driver and control connections. Instead of directly using the MCU's PWM port, they choose a suitable PWM output chip and design an appropriate constant-current output while ensuring illumination and temperature control.

[0023] Figure 1 A schematic diagram of a control circuit for medical lighting provided in an embodiment of the present application is provided. In view of this, as Figure 1 As shown, an embodiment of the present application provides a control circuit for medical lighting, including: a control chip 100, an RC circuit 200, an adjustable resistor 300, a first inductor 400 and a light-emitting diode 500, the adjustable resistor 300 is connected to the control chip 100, the light-emitting diode 500 is connected to the lighting device, the two pins of the control chip 100 are respectively connected to the signal input and the PWM signal, the control chip 100, the first inductor 400, the RC circuit 200 and the light-emitting diode 500 are connected in sequence, and one end of the adjustable resistor 300 and one end of the RC circuit 200 are both grounded.

[0024] Specifically, the adjustable resistor 300 is connected to the control chip 100, and the light-emitting diode 500 is connected to the lighting equipment (shadowless lamp) to illuminate the surgical site and reduce shadows during the operation. The two pins of the control chip 100 are respectively connected to the signal input and the PWM signal, for example, the IN pin and the PWM pin of the control chip 100, the signal input (INPUT) is transmitted to the IN pin, and the PWM signal is transmitted to the control chip 100 through the PWM pin. The control chip 100, the first inductor 400, the RC circuit 200 and the light-emitting diode 500 are connected in sequence. In this way, based on the PWM signal and the INPUT signal input, the control chip 100 realizes precise control of the brightness of the light-emitting diode 500, wherein one end of the adjustable resistor 300 and one end of the RC circuit 200 are both grounded to ensure the stability and safety of the circuit. For example, the first inductor 400 is an inductor of 10μH, the signal input can come from a switch or sensor for controlling the opening and closing of the lighting equipment, and the PWM signal can come from the PWM signal generated by the MCU for controlling the brightness of the light-emitting diode 500. It should be noted that the resistance value of the adjustable resistor 300 can be adjusted according to the needs of different occasions to optimize the brightness and shadowlessness of the lighting device.

[0025] It should be noted that the control circuit of the medical lighting in the embodiment of the present application can not only be used for power supply control of the shadowless lamp, but also for auxiliary lighting in the operating room, dental and ophthalmic diagnostic lighting, etc. In order to avoid repetition, the following description will be given using the shadowless lamp as an example, which should not be understood as limiting the scope of protection of this application.

[0026] The control chip 100, RC circuit 200, and adjustable resistor 300 effectively suppress electromagnetic interference (EMI), reducing the likelihood of the shadowless lamp being affected by external electromagnetic fields and ensuring stable operation. The control chip 100 precisely adjusts the brightness of the shadowless lamp, improving the accuracy of the brightness.

[0027] It should be understood that the multi-channel output PWM chip reduces the occupation of the MCU's PWM resources; the analog signal is output through the RC processing circuit to control the constant current output of the buck circuit, adjust the lighting parameters, improve the simple digital dimming, and effectively avoid the flicker phenomenon; the control chip 100 has a chopping frequency characteristic, and a common mode inductor (first inductor) is connected to its outside, which reduces a certain amount of EMI interference for subsequent EMC testing and avoids the phenomenon of light flicker.

[0028] In some embodiments, the RC circuit 200 includes a first resistor 210 and a first capacitor 220 , the first inductor 400 , the first resistor 210 and the light-emitting diode 500 are connected in sequence, one end of the first capacitor 220 is grounded, and the other end of the first capacitor 220 is connected to the first resistor 210 .

[0029] Specifically, the resistance of the first resistor 210 should be adapted to the light-emitting diode 500, and the current is limited by the first resistor 210 to protect the light-emitting diode 500 from damage by excessive current. Similarly, the capacitance of the first capacitor 220 should also be adapted to the requirements of the control circuit. For example, the capacitance of the first capacitor 220 is 0.1μF. The first capacitor 220 is used to filter out high-frequency noise in the circuit and improve the stability of the circuit. For example, the first inductor 400 is an inductor of 10μH. The first inductor 400 is connected to the first resistor 210 and the light-emitting diode 500 in sequence to form a loop. One end of the first capacitor 220 is grounded, and the other end is connected to the first resistor 210. The light-emitting diode 500 is connected to the shadowless lamp. The PWM signal of the control chip 100 adjusts the brightness of the light-emitting diode 500. By adjusting the resistance of the adjustable resistor 300, the input voltage of the control chip 100 can be changed, thereby achieving precise control of the brightness of the light-emitting diode 500. In particular, the number of the light emitting diodes 500 is two, and the two light emitting diodes 500 are arranged in series. For example, the two light emitting diodes 500 are respectively located on both sides of the signal output end.

[0030] The first capacitor 220 and the first resistor 210 effectively suppress high-frequency noise, improve the filtering effect, improve the stability of the circuit, help reduce electromagnetic interference (EMI), and ensure the reliability of the control circuit. The light-emitting diode 500 is protected by the first resistor 210 to prevent the light-emitting diode 500 from being damaged by excessive current.

[0031] In some embodiments, the control circuit of the medical lighting includes a second capacitor 600 , one end of the second capacitor 600 is connected to a pin of the control chip 100 , and the other end of the second capacitor 600 is connected to the first inductor 400 .

[0032] Specifically, one end of the second capacitor 600 is connected to the BST pin of the control chip 100 . For example, the second capacitor 600 is a 0.1 μF capacitor. The second capacitor 600 filters high-frequency noise in the circuit. The other end of the second capacitor 600 is connected to the first inductor 400 .

[0033] Since the second capacitor 600 is connected between the pin of the control chip 100 and the first inductor 400, it can perform filtering, effectively suppress high-frequency noise, protect the control chip 100 from power ripple and electromagnetic interference, and improve the stability of the control chip.

[0034] In some embodiments, the control circuit of the medical lighting includes a third capacitor 700 , one end of the third capacitor 700 is connected to the signal input, and the other end of the third capacitor 700 is grounded.

[0035] Specifically, one end of the third capacitor 700 is connected to the signal input (INPUT), for example, one end of the third capacitor 700 and the signal input (INPUT) are both connected to the IN pin of the control chip 100. The other end of the third capacitor 700 is grounded to stabilize the reference potential of the circuit.

[0036] The introduction of the third capacitor 700 effectively filters out noise and interference in the circuit, thereby improving the quality and clarity of the signal, improving signal quality, enhancing circuit stability, and improving control accuracy.

[0037] In some embodiments, the control circuit for medical lighting includes a fourth capacitor 800 . One end of the fourth capacitor 800 is connected to the VCC pin of the control chip 100 , and the other end of the fourth capacitor 800 is grounded. This reduces voltage fluctuations and interference in the circuit and improves overall circuit stability. Specifically, the fourth capacitor 800 and the third capacitor 700 have the same capacitance value. For example, the fourth capacitor 800 and the third capacitor 700 both have a capacitance value of 0.1 μF.

[0038] In some embodiments, the control circuit of the medical lighting includes a second resistor 900 , one end of the second resistor 900 is connected to the VCC pin of the control chip 100 , and the other end of the second resistor 900 is connected to the adjustable resistor 300 .

[0039] Specifically, the two ends of second resistor 900 are connected to the VCC and REFI pins of control chip 100, respectively. Meanwhile, the other end of second resistor 900 is connected to adjustable resistor 300, enabling circuit parameters, such as current, to be adjusted as needed. By adjusting the value of adjustable resistor 300, the user can precisely control the brightness and other characteristics of the shadowless lamp.

[0040] The introduction of the second resistor 900 can ensure that the control chip 100 obtains a stable power supply. The user can adjust the value of the adjustable resistor 300 according to specific needs, thereby achieving precise control of the brightness and other characteristics of the shadowless lamp, so that the shadowless lamp control circuit can adapt to different application scenarios and needs.

[0041] The present application also provides a lighting device, comprising: a shell with a receiving cavity formed therein, and a control circuit of any of the above-mentioned medical lighting devices, which is arranged in the shell.

[0042] 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 control circuit for medical lighting, characterized in that: include: A control chip, an RC circuit, an adjustable resistor, a first inductor and a light-emitting diode, wherein the adjustable resistor is connected to the control chip, the light-emitting diode is connected to a lighting device, two pins of the control chip are respectively connected to a signal input and a PWM signal, the control chip, the first inductor, the RC circuit and the light-emitting diode are connected in sequence, and one end of the adjustable resistor and one end of the RC circuit are both grounded.

2. A medical lighting control circuit according to claim 1, characterized in that: The RC circuit includes a first resistor and a first capacitor. The first inductor, the first resistor, and the light-emitting diode are connected in sequence. One end of the first capacitor is grounded, and the other end of the first capacitor is connected to the first resistor.

3. The control circuit for medical lighting according to claim 1, characterized in that: The control circuit of the medical lighting includes a second capacitor, one end of the second capacitor is connected to a pin of the control chip, and the other end of the second capacitor is connected to the first inductor.

4. The control circuit for medical lighting according to claim 1, characterized in that: The control circuit of the medical lighting comprises a third capacitor, one end of the third capacitor is connected to the signal input, and the other end of the third capacitor is grounded.

5. The control circuit for medical lighting according to claim 4, characterized in that: The control circuit of the medical lighting includes a fourth capacitor, one end of the fourth capacitor is connected to the VCC pin of the control chip, and the other end of the fourth capacitor is grounded.

6. The control circuit for medical lighting according to claim 5, characterized in that: The capacitance value of the fourth capacitor is consistent with that of the third capacitor.

7. The control circuit for medical lighting according to claim 5, characterized in that: The control circuit of the medical lighting includes a second resistor, one end of the second resistor is connected to the VCC pin of the control chip, and the other end of the second resistor is connected to the adjustable resistor.

8. The control circuit for medical lighting according to claim 1, characterized in that: There are two light emitting diodes, which are connected in series.

9. A lighting device, characterized in that: include: A shell having an accommodating cavity formed therein, and the control circuit for medical lighting according to any one of claims 1 to 8 are arranged in the shell.

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