Control circuit for shadowless lamp and shadowless lamp

Abstract

One end of the control circuit is connected with the shadowless lamp, the other end of the control circuit is connected with a power source, and the control circuit comprises a capacitive reactance circuit, a control chip, an impedance circuit, a first RC circuit and a common mode inductor. The control chip is respectively connected with the capacitive reactance circuit, the impedance circuit and the first RC circuit; two ends of the common mode inductor are respectively connected with the first RC circuit and the shadowless lamp; wherein one end of the capacitive reactance circuit is connected with the power supply, and the other end of the capacitive reactance circuit is grounded. The capacitive reactance circuit, the impedance circuit, the first RC circuit and the common mode inductor are additionally arranged in the control circuit, stroboflash of the shadowless lamp is effectively eliminated, the comfort degree of the operation environment is improved, the common mode inductor effectively resists interference of external large-current equipment, and normal work of the shadowless lamp is guaranteed.

Description

Technical Field

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

[0002] The brightness and shadowlessness of LED (Light Emitting Diode) shadowless lamps are directly related to surgical quality and patient health. Traditional methods manually adjust the brightness based on the operator's comfort level, making it difficult to accurately guarantee brightness and easily polluting 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 the problem of flickering, and the control box is easily interfered with by external high-current equipment. Utility Model Content

[0004] The purpose of the present application is to provide a control circuit and a shadowless lamp for a shadowless lamp, so as to solve the problems of flickering and external interference of the shadowless lamp.

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

[0006] The first aspect of the present application provides a control circuit for a shadowless lamp, one end of the control circuit is connected to the shadowless lamp, and the other end is connected to a power supply. The control circuit includes: a capacitive reactance circuit, a control chip, an impedance circuit, a first RC circuit and a common-mode inductor. The control chip is respectively connected to the capacitive reactance circuit, the impedance circuit and the first RC circuit, and the two ends of the common-mode inductor are respectively connected to the first RC circuit and the shadowless lamp; wherein, one end of the capacitive reactance circuit is connected to the power supply, and the other end of the capacitive reactance circuit is grounded.

[0007] By adding a capacitive reactance circuit, an impedance circuit, a first RC circuit, and a common-mode inductor to the control circuit, the flicker phenomenon of the shadowless lamp can be effectively eliminated, the comfort of the operating environment can be improved, the doctor's visual fatigue can be reduced, and the quality of surgery can be improved. The common-mode inductor in the control circuit can effectively resist interference from external high-current equipment and ensure the normal operation of the shadowless lamp.

[0008] Furthermore, the first RC circuit includes a first resistor and a first capacitor, the first resistor and the first capacitor are arranged in parallel, and both the first resistor and the first capacitor are connected to the common-mode inductor.

[0009] By setting a first RC circuit including a first resistor and a first capacitor in parallel in the control circuit, high-frequency noise is effectively filtered out, the control stability of the shadowless lamp is improved, the system's ability to suppress common-mode interference is enhanced, and the normal operation of the shadowless lamp in a complex electromagnetic environment is ensured.

[0010] Furthermore, the control circuit for the shadowless lamp includes a diode, one end of the diode is connected to the impedance circuit, and the other end of the diode is connected to the control chip.

[0011] By adding a diode to the control circuit, the control chip can be effectively protected from damage caused by excessive voltage, reverse voltage damage can be prevented, and the overall safety performance of the circuit can be improved.

[0012] Furthermore, the control circuit for the shadowless lamp includes a second RC circuit, which is provided with a second resistor and a second capacitor. The second resistor and the second capacitor are connected in series, and the other end of the second resistor and the other end of the second capacitor are respectively connected to the two ends of the diode.

[0013] Since the second resistor and the second capacitor in the second RC circuit are connected in series, distortion and attenuation of the signal during transmission are reduced, thereby ensuring the accuracy and reliability of the control signal.

[0014] Furthermore, the impedance circuit includes a plurality of third resistors, and the plurality of third resistors are arranged in parallel.

[0015] By setting multiple third resistors in parallel in the control circuit, the load is dispersed, the stability of the circuit is improved, a single resistor is prevented from being subjected to excessive current, and the risk of damage is reduced.

[0016] Furthermore, the control circuit for the shadowless lamp includes two first inductors, wherein two ends of one first inductor are respectively connected to the impedance circuit and the first RC circuit, and two ends of the other first inductor are respectively connected to the first RC circuit and the control chip.

[0017] By arranging two first inductors in the control circuit, the response speed of the circuit to the input signal can be improved, thereby ensuring the rapid transmission and processing of the shadowless lamp control signal.

[0018] Furthermore, the capacitive reactance circuit includes two third capacitors, one end of each of the two third capacitors is grounded, and the other end of each of the two third capacitors is connected to the power supply.

[0019] By providing two third capacitors in the circuit and connecting one end of the capacitors to the ground and the other end to the power supply, the stability of the power supply can be improved and the impact of power supply fluctuations on the circuit can be reduced.

[0020] Furthermore, the capacitances of the two third capacitors are different.

[0021] By using two third capacitors with different capacitances, filtering can be performed according to different frequency characteristics, effectively suppressing high-frequency noise and low-frequency interference, thereby optimizing the filtering effect of the circuit. The two third capacitors with different capacitances can cope with power supply fluctuations and load changes of different frequencies, improving the circuit's adaptability to different working environments.

[0022] Furthermore, the model of the common-mode inductor is CMF4532, thereby ensuring that the circuit has a good common-mode filtering effect, effectively resisting external electromagnetic interference, and ensuring stable operation of the circuit.

[0023] 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.

[0024] Compared with the existing technology, the beneficial effects of the present application are: the control circuit structure is simple and easy to operate, and it has good stability and is easy to maintain. At the same time, by adding a capacitive reactance circuit, an impedance circuit, a first RC circuit and a common-mode inductor to the control circuit, the flicker phenomenon of the shadowless lamp can be effectively eliminated, the comfort of the operating environment can be improved, the doctor's visual fatigue can be reduced, and the quality of surgery can be improved. The common-mode inductor in the control circuit can effectively resist the interference of external high-current equipment, ensure the normal operation of the shadowless lamp, and reduce the risk of pollution in the operating environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a control circuit for a shadowless lamp provided in an embodiment of the present application.

[0026] Description of reference numerals:

[0027] 100, capacitive reactance circuit; 101, third capacitor; 200, control chip; 300, impedance circuit; 301, third resistor; 400, first RC circuit; 401, first resistor; 402, first capacitor; 500, common-mode inductor; 600, diode; 700, second RC circuit; 701, second resistor; 702, second capacitor; 800, first inductor. DETAILED DESCRIPTION

[0028] The specific implementation methods of this application are described in detail below with reference to the accompanying drawings.

[0029] 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.

[0030] 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.

[0031] Shadowless lamps on the market suffer from flickering, high lamp head temperatures, and susceptible control boxes 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, we selected a suitable PWM output chip and designed an appropriate constant-current output while ensuring both illumination and temperature control.

[0032] Figure 1 A schematic diagram of a control circuit for a shadowless lamp provided in an embodiment of the present application, in view of this, as Figure 1 As shown, an embodiment of the present application provides a control circuit for a shadowless lamp, one end of the control circuit is connected to the shadowless lamp, and the other end is connected to a power supply. The control circuit includes a capacitive circuit 100, a control chip 200, an impedance circuit 300, a first RC circuit 400 and a common-mode inductor 500. The control chip 200 is respectively connected to the capacitive circuit 100, the impedance circuit 300 and the first RC circuit 400, and the two ends of the common-mode inductor 500 are respectively connected to the first RC circuit 400 and the shadowless lamp; wherein, one end of the capacitive circuit 100 is connected to the power supply, and the other end of the capacitive circuit 100 is grounded.

[0033] Specifically, one end of the control circuit is connected to the shadowless lamp, and the other end is connected to the power supply. A capacitive reactance circuit 100 is provided in the control circuit to suppress high-frequency interference and ensure stable transmission of the control signal. One end of the capacitive reactance circuit 100 is connected to the power supply, and the other end is grounded. A control chip 200 is provided in the control circuit to process the control signal and adjust the brightness and color temperature of the shadowless lamp. The control chip 200 is respectively connected to the capacitive reactance circuit 100, the impedance circuit 300 and the first RC circuit 400. The impedance circuit 300 is provided in the control circuit to match the impedance between the power supply and the shadowless lamp, thereby improving the utilization rate of the power supply and the stability of the system. The first RC circuit 400 is provided in the control circuit to filter out high-frequency noise and ensure the accuracy of the control signal. A common-mode inductor 500 is provided in the control circuit to suppress common-mode interference in the power grid and ensure the stability of the control circuit. The two ends of the common-mode inductor 500 are respectively connected to the first RC circuit 400 and the shadowless lamp. In particular, the model of the common-mode inductor 500 is CMF4532, thereby ensuring that the circuit has a good common-mode filtering effect, effectively resisting external electromagnetic interference, and ensuring the stable operation of the circuit.

[0034] By adding a capacitive reactance circuit 100, an impedance circuit 300, a first RC circuit 400, and a common-mode inductor 500 to the control circuit, the flicker phenomenon of the shadowless lamp can be effectively eliminated, the comfort of the surgical environment can be improved, the doctor's visual fatigue can be reduced, and the quality of surgery can be improved. The common-mode inductor in the control circuit can effectively resist interference from external high-current equipment and ensure the normal operation of the shadowless lamp.

[0035] In some embodiments, the first RC circuit 400 includes a first resistor 401 and a first capacitor 402 . The first resistor 401 and the first capacitor 402 are connected in parallel. Both the first resistor 401 and the first capacitor 402 are connected to the common-mode inductor 500 .

[0036] Specifically, in the control circuit, the first resistor 401 and the first capacitor 402 are arranged in parallel. This parallel structure can improve the filtering effect of the circuit and effectively suppress high-frequency noise and interference. The first resistor 401 and the first capacitor 402 are both connected to the common-mode inductor 500. The common-mode inductor 500 is used to suppress common-mode interference in the power grid and ensure the stability of the control circuit. By connecting with the common-mode inductor 500, the filtering effect can be further improved and the accuracy of the control signal can be guaranteed. In particular, in practical applications, the first resistor 401 and the first capacitor 402 can be placed in close range of the shadowless lamp control circuit to ensure the stability of signal transmission and reduce line loss.

[0037] By setting a first RC circuit 400 including a first resistor 401 and a first capacitor 402 in parallel in the control circuit, high-frequency noise is effectively filtered out, the control stability of the shadowless lamp is improved, the system's ability to suppress common-mode interference is enhanced, and the normal operation of the shadowless lamp in a complex electromagnetic environment is ensured.

[0038] In some embodiments, the control circuit for the shadowless lamp includes a diode 600 , one end of the diode 600 is connected to the impedance circuit 300 , and the other end of the diode 600 is connected to the control chip 200 .

[0039] Specifically, one end of diode 600 is connected to impedance circuit 300, which is used to match the impedance between the power supply and the shadowless lamp, improving power supply utilization and system stability. The other end of diode 600 is connected to control chip 200. When an overvoltage or overcurrent condition occurs in impedance circuit 300, diode 600 can quickly turn on, directing the overvoltage or overcurrent to ground, thereby protecting control chip 200 from damage. A suitable diode 600 is selected based on the operating voltage and current range of the circuit. For example, a silicon diode is selected whose turn-on voltage should be within the operating voltage range of the circuit.

[0040] By adding the diode 600 to the control circuit, the control chip is effectively protected from damage caused by excessive voltage and reverse voltage, thereby improving the overall safety performance of the circuit.

[0041] In some embodiments, the control circuit for the shadowless lamp includes a second RC circuit 700, on which a second resistor 701 and a second capacitor 702 are provided. The second resistor 701 and the second capacitor 702 are connected in series, and the other end of the second resistor 701 and the other end of the second capacitor 702 are respectively connected to the two ends of the diode 600.

[0042] Specifically, the second resistor 701 and the second capacitor 702 are connected in series. This series structure can provide the circuit with better filtering effects, effectively suppressing high-frequency noise and interference. The other end of the second resistor 701 and the other end of the second capacitor 702 are connected to the two ends of the diode 600, respectively. The second RC circuit 700 can work together with the diode 600 to improve the filtering effect and stability of the circuit. In particular, placing the second RC circuit 700 in close proximity to the shadowless lamp control circuit ensures signal transmission stability and reduces line losses.

[0043] Since the second resistor 701 and the second capacitor 702 in the second RC circuit 700 are connected in series, the distortion and attenuation of the signal during transmission are reduced, thereby ensuring the accuracy and reliability of the control signal.

[0044] In some embodiments, the impedance circuit 300 includes a plurality of third resistors 301 , and the plurality of third resistors 301 are connected in parallel.

[0045] Specifically, impedance circuit 300 includes multiple third resistors 301. Arranging multiple third resistors 301 in parallel can improve circuit matching, effectively reduce circuit losses, and increase power supply utilization and system stability. In particular, appropriate third resistors 301 are selected based on the operating voltage and current range of the circuit. The resistance values of these resistors should be adjusted according to actual needs to achieve optimal impedance matching.

[0046] By providing a plurality of third resistors 301 connected in parallel in the control circuit, the load is dispersed, the stability of the circuit is improved, a single resistor is prevented from bearing excessive current, and the risk of damage is reduced.

[0047] In some embodiments, the control circuit for the shadowless lamp includes two first inductors 800 , wherein the two ends of one first inductor 800 are respectively connected to the impedance circuit 300 and the first RC circuit 400 , and the two ends of the other first inductor 800 are respectively connected to the first RC circuit 400 and the control chip 200 .

[0048] Specifically, the two ends of one first inductor 800 are respectively connected to the impedance circuit 300 and the first RC circuit 400. The first inductor 800 can connect the impedance circuit 300 and the first RC circuit 400, and work together in the circuit to improve the filtering effect and stability of the circuit. The two ends of the other first inductor 800 are respectively connected to the first RC circuit 400 and the control chip 200. The first inductor 800 can connect the first RC circuit 400 and the control chip 200, and work together in the circuit to improve the filtering effect and stability of the circuit. In particular, two suitable first inductors 800 are selected based on the operating voltage and current range of the circuit. The values of these inductors should be adjusted according to actual needs to achieve the best filtering effect.

[0049] By providing two first inductors 800 in the control circuit, the response speed of the circuit to the input signal can be improved, thereby ensuring the rapid transmission and processing of the shadowless lamp control signal.

[0050] In some embodiments, the capacitive reactance circuit 100 includes two third capacitors 101 , one end of each of the two third capacitors 101 is grounded, and the other end of each of the two third capacitors 101 is connected to a power supply.

[0051] Specifically, one end of the two third capacitors 101 is grounded to ensure a good connection between one end of the capacitor and the ground so that the capacitors can function properly. The other ends of the two third capacitors 101 are connected to a power supply, and the capacitive reactance circuit 100 is connected to the control circuit of the shadowless lamp. It should be noted that the capacitive reactance circuit 100 can be adjusted as needed to achieve the desired effect. In particular, the capacitance of the two third capacitors 101 is different.

[0052] By providing two third capacitors 101 in the circuit, with one end of the capacitors being grounded and the other end being connected to the power supply, the stability of the power supply can be improved and the influence of power supply fluctuations on the circuit can be reduced.

[0053] It should be noted that by using two third capacitors 101 with different capacitances, filtering can be performed according to different frequency characteristics, effectively suppressing high-frequency noise and low-frequency interference, thereby optimizing the filtering effect of the circuit. The two third capacitors 101 with different capacitances can cope with power supply fluctuations and load changes of different frequencies, thereby improving the circuit's adaptability to different working environments.

[0054] 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.

[0055] 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 a shadowless lamp, wherein one end of the control circuit is connected to the shadowless lamp and the other end is connected to a power supply, characterized in that: The control circuit includes: a capacitive reactance circuit, a control chip, an impedance circuit, a first RC circuit and a common-mode inductor. The control chip is respectively connected to the capacitive reactance circuit, the impedance circuit and the first RC circuit. The two ends of the common-mode inductor are respectively connected to the first RC circuit and the shadowless lamp. One end of the capacitive reactance circuit is connected to the power supply, and the other end of the capacitive reactance circuit is grounded.

2. The control circuit for a shadowless lamp according to claim 1, characterized in that: The first RC circuit includes a first resistor and a first capacitor, the first resistor and the first capacitor are arranged in parallel, and both the first resistor and the first capacitor are connected to the common-mode inductor.

3. The control circuit for a shadowless lamp according to claim 1, characterized in that: The control circuit for the shadowless lamp includes a diode, one end of the diode is connected to the impedance circuit, and the other end of the diode is connected to the control chip.

4. The control circuit for a shadowless lamp according to claim 3, characterized in that: The control circuit for the shadowless lamp includes a second RC circuit, which is provided with a second resistor and a second capacitor. The second resistor and the second capacitor are connected in series, and the other end of the second resistor and the other end of the second capacitor are respectively connected to the two ends of the diode.

5. The control circuit for a shadowless lamp according to claim 1, characterized in that: The impedance circuit includes a plurality of third resistors, and the plurality of third resistors are arranged in parallel.

6. The control circuit for a shadowless lamp according to claim 1, characterized in that: The control circuit for the shadowless lamp includes two first inductors, wherein two ends of one first inductor are respectively connected to the impedance circuit and the first RC circuit, and two ends of the other first inductor are respectively connected to the first RC circuit and the control chip.

7. The control circuit for a shadowless lamp according to claim 1, characterized in that: The capacitive reactance circuit includes two third capacitors, one end of the two third capacitors is grounded, and the other end of the two third capacitors is connected to the power supply.

8. The control circuit for a shadowless lamp according to claim 7, characterized in that: The capacitances of the two third capacitors are different.

9. The control circuit for a shadowless lamp according to claim 1, characterized in that: The model of the common mode inductor is CMF4532.

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

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