CN218124968U - Driving circuit of LED lamp and endoscope light source - Google Patents
Driving circuit of LED lamp and endoscope light source Download PDFInfo
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- CN218124968U CN218124968U CN202221627517.XU CN202221627517U CN218124968U CN 218124968 U CN218124968 U CN 218124968U CN 202221627517 U CN202221627517 U CN 202221627517U CN 218124968 U CN218124968 U CN 218124968U
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Abstract
The application discloses drive circuit and endoscope light source of LED lamp relates to the endoscope field, and this drive circuit includes DC-DC conversion module, linear drive module and the control module including N parallel connection's linear power device, and control module controls N linear power device according to the expectation electric current to make linear drive module output the expectation electric current, thereby realize the drive to the LED lamp. Adopt the parallelly connected mode of N linear power device in this application for the great drive current can be exported to the output after parallelly connected, and then can realize the drive to heavy current LED lamp, and in addition, the ripple of the output current of linear power device is less and the precision is higher, consequently, is applied to the endoscope light source with it, can realize the highlight and give out light, and can not cause adverse effect to the quality of the image that image sensor gathered in the endoscope.
Description
Technical Field
The application relates to the technical field of endoscopes, in particular to a driving circuit of an LED lamp and an endoscope light source.
Background
The front end of the lens of the medical endoscope is provided with an image sensor and an illuminating window which are used for observing the inside of a human body so as to realize the examination or treatment of the human body. Specifically, when the endoscope is used, the distal end (the end including the image sensor) is inserted into a patient, the light source is driven to emit light, the distal end is guided through the optical fiber to be illuminated, and an image in the patient is acquired through the image sensor. The current common light source on the market is an LED (light emitting diode) lamp, and since the LED lamp is a current driving type device, the magnitude of the driving current directly affects the intensity of light emission of the LED lamp, the ripple of the driving current directly affects whether the light emission of the LED lamp is stable, and the precision of the driving current directly affects the consistency of endoscopic imaging.
Currently, in order to achieve high-luminance light emission, it is desirable to be able to drive an LED lamp with a large current (e.g., 30A or more). In the prior art, a DC-DC (DC-DC converter) module is usually adopted to drive the LED lamp, and although the large-current driving can be realized by using this method, the precision of the driving current is low and the ripple of the driving current is large, which easily causes the abnormality of the image collected by the image sensor, and the consistency is poor, thereby affecting the judgment of the doctor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a drive circuit and endoscope light source of LED lamp, adopt the parallelly connected mode of N linear power device, make the output after parallelly connected can output great drive current, and then can realize the drive to heavy current LED lamp, furthermore, the ripple of the output current of linear power device is less and the precision is higher, consequently, be applied to the endoscope light source with it, can realize the highlight and give off light, and can not cause adverse effect to the quality of the image that image sensor gathered in the endoscope.
In order to solve the above technical problem, the present application provides a driving circuit of an LED lamp, including:
a DC-DC conversion module for outputting a target voltage;
the linear driving module comprises N linear power devices connected in parallel, each linear power device comprises an input end, an output end and a control end, the input ends of the N linear power devices are connected with each other to form the input end of the linear driving module, the output ends of the N linear power devices are connected with each other to form the output end of the linear driving module, the input end of the linear driving module is connected with the output end of the DC-DC conversion module, the output end of the linear driving module is connected with the LED lamp, and N is an integer greater than 1;
and the control module comprises a first output end, the first output end is respectively connected with the control ends of the N linear power devices and is used for respectively controlling the N linear power devices according to the expected current so that the output end of the linear driving module outputs the expected current to drive the LED lamp.
Optionally, the control module further includes a second output end, and the second output end is connected to the control end of the dc-dc conversion module;
the control module is further configured to:
and controlling the DC-DC conversion module to output the target voltage according to the expected current.
Optionally, the dc-dc conversion module includes:
and the input end of the DC-DC circuit is connected with the output end of a power supply so as to receive a first voltage output by the power supply, the control end of the DC-DC circuit is connected with the second output end of the control module so as to convert the first voltage into the target voltage according to a control signal of the control module, and the output end of the DC-DC circuit is the output end of the DC-DC conversion module.
Optionally, the dc-dc conversion module further includes:
the input end of the voltage detection circuit is connected with the output end of the DC-DC circuit and used for detecting the current output voltage of the DC-DC circuit;
and the input end of the voltage feedback control circuit is connected with the output end of the voltage detection circuit, the output end of the voltage feedback control circuit is connected with the control end of the DC-DC circuit, and the voltage feedback control circuit is used for carrying out closed-loop regulation on the output voltage of the DC-DC circuit according to the difference value between the current output voltage and the target voltage so as to stabilize the output voltage of the DC-DC circuit at the target voltage.
Optionally, the method further comprises:
the input end of the pressure difference detection module is respectively connected with the input end and the output end of the linear power device, and the output end of the pressure difference detection module is connected with the control module and is used for detecting the pressure difference between the input end and the output end of the linear power device and feeding the pressure difference back to the control module;
then, the control module is further configured to:
and controlling the DC-DC conversion module to adjust the output voltage according to the voltage difference so as to maintain the voltage difference between the input end and the output end of the linear power device within a preset range.
Optionally, the preset range is 0.1V to 1V.
Optionally, the linear power device is a MOS transistor.
Optionally, the output currents of N linear power devices are equal.
Optionally, the linear driving module further comprises:
the current detection circuits are connected with the output ends of the linear power devices in a one-to-one correspondence mode, and each current detection circuit is used for detecting the current output current of the corresponding linear power device;
and the output end of each current feedback control circuit is connected with the control end of the corresponding linear power device and used for carrying out closed-loop regulation on the output current of the linear power device according to the difference value of the current output current and 1/N of the expected current so as to stabilize the output current at 1/N of the expected current.
Optionally, the controlling the dc-dc conversion module to output the target voltage according to the desired current includes:
and determining the target voltage according to the expected current, and controlling the output voltage of the direct current-direct current conversion module to be gradually increased from a preset voltage to the target voltage within a preset time period.
In order to solve the technical problem, the application further provides an endoscope light source, which comprises an LED lamp and the LED lamp driving circuit, wherein the output end of the driving circuit is connected with the LED lamp. .
The application provides a drive circuit of LED lamp and endoscope light source's beneficial effect lies in:
the driving circuit comprises a direct current-direct current conversion module, a linear driving module and a control module, wherein the linear driving module comprises N linear power devices connected in parallel, and the control module controls the N linear power devices according to expected current so that the output ends (namely the output ends of the linear driving module) of the N linear power devices connected in parallel output the expected current, thereby realizing the driving of the LED lamp. Adopt the parallelly connected mode of N linear power device in this application for the great drive current can be exported to the output after parallelly connected, and then can realize the drive to heavy current LED lamp, and in addition, the ripple of the output current of linear power device is less and the precision is higher, consequently, is applied to the endoscope light source with it, can realize the highlight and give out light, and can not cause adverse effect to the quality of the image that image sensor gathered in the endoscope.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings required for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained by those skilled in the art without inventive effort.
Fig. 1 is a block diagram of a driving circuit of an LED lamp provided in the present application;
fig. 2 is a diagram illustrating a specific implementation example of a driving circuit of an LED lamp according to the present application;
fig. 3 is a block diagram of an endoscope light source according to the present application.
Detailed Description
The core of the application is to provide a drive circuit and endoscope light source of LED etc., adopt the parallelly connected mode of N linear power device for output after parallelly connected can export great drive current, and then can realize the drive to heavy current LED lamp, furthermore, the ripple of the output current of linear power device is less and the precision is higher, consequently, be applied to the endoscope light source with it, can realize the highlight and give off light, and can not cause adverse effect to the quality of the image that image sensor gathered in the endoscope.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a block diagram of a driving circuit of an LED lamp provided in the present application, where the driving circuit includes:
a dc-dc conversion module 11 for outputting a target voltage;
the linear driving module 10 comprises N linear power devices 12 connected in parallel, each linear power device 12 comprises an input end, an output end and a control end, the input ends of the N linear power devices 12 are connected with each other to form the input end of the linear driving module 10, the output ends of the N linear power devices 12 are connected with each other to form the output end of the linear driving module 10, the input end of the linear driving module 10 is connected with the output end of the DC-DC conversion module, the output end of the linear driving module 10 is connected with an LED lamp, and N is an integer greater than 1;
and the control module 13 includes a first output end, the first output end is respectively connected with the control ends of the N linear power devices 12, and is used for respectively controlling the N linear power devices 12 according to the desired current, so that the output end of the linear driving module 10 outputs the desired current to drive the LED lamp.
The design idea of the application is as follows: the LED lamp is driven by a device with smaller output ripple and higher precision, so that the ripple of the output driving current is reduced, the precision of the driving current is improved, the LED lamp is reliably driven, and the brightness is stable.
Specifically, the applicant considers that the accuracy of the current output by the linear power device is high and the ripple is small, so that the linear power device can be used as a device for driving the LED lamp, but when the LED lamp is driven by using a single linear power device, if the current flowing through the linear power device is too large, the heat is concentrated to one point, and the linear power device is easy to burn, so that the single linear power device can only realize small-current driving, and cannot realize large-current driving. Therefore, in the present application, N linear power devices 12 connected in parallel are selected to form the linear driving module 10, and the current value output by the output end (i.e., the output end of the linear driving module 10) of the N parallel linear power devices 12 is the superposition of the output current values of the linear power devices 12, so that the large current driving of the LED lamp can be realized.
Specifically, the specific operating principle of the driving circuit is as follows: the desired current is determined according to the model of the LED lamp to be driven, and then the control module 13 controls the output ends of the N parallel linear power devices 12 to output the desired current according to the desired current to drive the LED lamp, where the specific control mode may be, but not limited to, closed-loop control, so that the output ends after being connected in parallel stably output the desired current, and reliable control of the LED lamp is achieved.
It can be seen from the above technical solutions that, in the present application, the dc-dc conversion module 11 outputs the target voltage value to drive the N linear power devices 12 in the linear driving module 10, and the control module 13 controls the N linear power devices 12 to output the desired current, which not only can realize large-current driving, but also can output the driving current with higher precision and smaller ripple.
Referring to fig. 2, fig. 2 is a diagram illustrating an embodiment of a driving circuit of an LED lamp according to the present disclosure.
As an alternative embodiment, the linear power device 12 may be a MOS transistor.
Specifically, the input ends of the N MOS transistors are connected to each other and serve as the input end of the linear driving module 10, the output ends of the N MOS transistors are connected to each other and serve as the output end of the linear driving module 10, and the gate of the MOS transistor is the control end of the linear power device 12.
Further, this embodiment aims to provide a specific implementation manner of the linear power device 12, which may be but is not limited to an MOS transistor, at this time, the control module 13 is specifically configured to control a gate of the MOS transistor according to a desired current, so as to control a conduction degree of each MOS transistor, so that an output end of the N MOS transistors connected in parallel outputs the desired current.
Of course, the specific implementation of the linear power device 12 is not limited to the MOS transistor, and other implementations are also possible, and the present application is not limited herein.
As an optional embodiment, when the MOS transistor is an NMOS transistor, the drain of the NMOS transistor is the input terminal of the MOS transistor, and the source of the NMOS transistor is the output terminal of the MOS transistor.
As an optional embodiment, when the MOS transistor is a PMOS transistor, the source of the PMOS transistor is an input terminal of the MOS transistor, and the drain of the NMOS transistor is an output terminal of the MOS transistor.
It can be seen that, when the specific implementation manner of the linear power device 12 is an MOS transistor, both PMOS and NMOS can implement this function, and the specific connection manner is as above, which is not described herein again.
Further, when the voltage difference between the input end and the output end of the linear power device 12 is large, the power consumption of the linear power device 12 is large, which easily causes the linear power device 12 to generate heat seriously, and affects the performance and the service life of the linear power device 12.
Therefore, in this embodiment, the linear driving module 10 may further include:
a differential pressure detection module 27, an input end of which is connected to the input end and the output end of the linear power device 12, respectively, and an output end of which is connected to the control module 13, for detecting the differential pressure between the input end and the output end of the linear power device 12 and feeding the differential pressure back to the control module;
then, the control module 13 is further configured to:
the dc-dc conversion module 11 is controlled to adjust the output voltage according to the voltage difference, so that the voltage difference between the input terminal and the output terminal of the linear power device 12 is maintained within a preset range.
In this embodiment, by providing the differential pressure detection module 27 for detecting the differential pressure between the input end and the output end of the linear power device 12, and enabling the control module 13 to adjust the voltage output by the dc-dc conversion module 11 according to the differential pressure between the input end and the output end of the linear power device 12, the dc-dc conversion module 11 controls the differential pressure of the linear power device 12 within a preset range while driving the N linear power devices 12, so as to reduce the power consumption of the linear power device 12, avoid serious heat generation of the linear power device 12, improve the performance of the linear power device 12, and prolong the service life of the linear power device 12.
The preset range corresponding to the pressure difference may be, but is not limited to, 0.1 to 1V, and of course, other implementation manners are also possible, and the present application is not limited herein.
Further, considering that the current outputted by the N linear power devices 12 is not uniform, the linear power device 12 with a larger output current may have a larger power consumption, generate heat more seriously, and be easily damaged, that is, the output current of the N linear power devices 12 is not uniform, which may cause the life of the N linear power devices 12 to be different greatly.
Therefore, in the present embodiment, the output currents of the N linear power devices 12 can be made equal.
Specifically, the control module 13 in this application further controls the output currents of the N linear power devices 12 to be equal, so that the N linear power devices 12 have the same working state, and a situation of large local power consumption is avoided. When the specific implementation manner of the linear power device 12 is an MOS transistor, the control module 13 may control the output currents of the N MOS transistors to be the same, and may control the conduction degrees of the N MOS transistors to be the same.
As an optional embodiment, in order to further ensure that the output currents of the N linear power devices 12 are equal, the linear driving module 10 may further include:
n current detection circuits 25 connected to the output terminals of the N linear power devices 12 in a one-to-one correspondence manner, each current detection circuit 25 being configured to detect a current output current of the linear power device 12 corresponding to itself;
and the N current feedback control circuits 26 are connected with the output ends of the N current detection circuits 25 in a one-to-one correspondence manner, and the output end of each current feedback control circuit 26 is connected with the control end of the corresponding linear power device 12 and used for carrying out closed-loop regulation on the output current of the linear power device 12 according to the difference value of the current output current and 1/N of the expected current so as to enable the output current to be stabilized at 1/N of the expected current.
In this embodiment, each linear power device 12 corresponds to an independent current detection circuit 25 and an independent current feedback control circuit 26, so that the current output by each linear power device 12 after the N linear power devices 12 are connected in parallel can be balanced, and excessive power consumption of part of the linear power devices 12 can be avoided.
Specifically, the current detection circuit 25 detects the current output current of the linear power device 12 corresponding to the current detection circuit, and the current feedback control circuit 26 performs closed-loop adjustment on the output current of the linear power device 12 based on 1/N of the desired current and the difference value of the current output current, so that the output current of the linear power device 12 is stabilized at 1/N of the desired current, and then the output ends of the N linear power devices 12 connected in parallel can output the desired current, thereby realizing reliable driving of the LED lamp and balancing the power consumption of the N linear power devices 12.
The current detection circuit 25 in this embodiment may be, but is not limited to, implemented by a sampling resistor, and the specific implementation of the current feedback control circuit 26 may be, but is not limited to, implemented by an error amplifier.
Of course, the specific implementation is not limited to the above examples, and other implementations may also be used, and the present application is not limited thereto.
Furthermore, it can be understood that, in the present embodiment, the linear power device 12 is mainly controlled by the current feedback control circuit 26, and therefore, the first output terminal of the control module 13 is specifically connected to the control terminal of the linear power device 12 through the current feedback control circuit 26, and thus, the current feedback control circuit 26 can determine the desired current according to the control signal output by the control module 13.
As an optional embodiment, the control module 13 further includes a second output terminal, and the second output terminal is connected to the control terminal of the dc-dc conversion module 11;
the control module 13 is further configured to:
and controlling the DC-DC conversion module 11 to output a target voltage according to the expected current.
In this embodiment, the output voltage of the dc-dc conversion module 11 is controlled by the control module 13, and at this time, since the output voltage of the dc-dc conversion module 11 is adjustable, the driving current output by the linear driving module 10 can be adjusted by adjusting the output voltage of the dc-dc conversion module 11, so that the brightness of the LED lamp is adjustable. In addition, when the target voltage is adjustable, the driving circuit in the application can be suitable for more types of LED lamps, and the use scenes of the driving circuit in the application are widened.
As an alternative embodiment, the dc-dc conversion module 11 includes:
the DC-DC circuit 22 has an input end connected to the output end of the power supply 21 to receive the first voltage outputted by the power supply, a control end connected to the second output end of the control module 13 to convert the first voltage into a target voltage according to the control signal of the control module 13, and an output end of the DC-DC conversion module 11.
Further, the DC-DC conversion module 11 may be implemented by, but not limited to, a DC-DC circuit 22 for connecting to a power supply 21, specifically, the power supply 21 is configured to output a fixed first voltage, which is a fixed DC power supply, and the DC-DC circuit 22 is configured to convert the first voltage into a target voltage according to the control of the control module 13.
The first voltage may be higher than the target voltage or lower than the target voltage, which is determined according to the magnitude of the desired current and the control of the control module 13, and the application is not limited herein.
Of course, the specific implementation manner of the dc-dc conversion module 11 may also be other implementation manners, and the present application is not limited herein.
As an alternative embodiment, the dc-dc conversion module 11 further includes:
a voltage detection circuit 23, an input end of which is connected with an output end of the DC-DC circuit, for detecting a current output voltage of the DC-DC circuit;
and the input end of the voltage feedback control circuit 24 is connected with the output end of the voltage detection circuit 23, and the output end of the voltage feedback control circuit is connected with the control end of the DC-DC circuit, and is used for performing closed-loop regulation on the output voltage of the DC-DC circuit according to the difference value between the current output voltage and the target voltage, so that the output voltage of the DC-DC circuit is stabilized at the target voltage.
Further, the present embodiment aims to provide a specific implementation manner for controlling the DC-DC circuit 22, wherein a corresponding voltage detection circuit 23 and a voltage feedback control circuit 24 are set for the DC-DC circuit 22, and an input end of the current feedback control circuit 24 is further connected to the second output end of the control module 13, and is configured to receive the voltage control signal output by the control module, and determine the target voltage according to the voltage control signal. Specifically, the voltage detection circuit 23 detects the current output voltage of the DC-DC circuit 22, and the voltage feedback control circuit 24 performs closed-loop adjustment on the output voltage of the DC-DC circuit 22 based on the difference between the target voltage and the current output voltage, so that the output voltage of the DC-DC conversion module 11 is stabilized at the target voltage.
The voltage detection circuit 23 in this embodiment may be, but is not limited to, implemented by a sampling resistor, and the voltage feedback control circuit 24 may be, but is not limited to, implemented by an error amplifier.
Of course, the specific implementation is not limited to the above example, and other implementations are also possible, and the present application is not limited thereto.
As an alternative embodiment, the control module 13 controls the dc-dc conversion module 11 to output the target voltage according to the desired current, and includes:
and determining a target voltage according to the expected current, and controlling the output voltage of the dc-dc conversion module 11 to be gradually increased from a preset voltage to the target voltage within a preset time period.
Specifically, considering that the output voltage of the dc-dc conversion module 11 is directly output to the target voltage, the N linear power devices 12 are suddenly driven by a large voltage, which may cause the linear power devices 12 to be damaged. Also, the driving circuit directly outputs a large current to drive the LED lamp, and may burn the LED lamp.
Therefore, in the present application, the output voltage of the dc-dc conversion module 11 is gradually increased from the preset voltage to the target voltage within the preset time period through the control of the control module 13, so that the driving voltages of the N linear power devices 12 are also gradually increased, the soft start of the driving circuit is realized, and the LED lamp is prevented from being burned down in the power-on process.
The preset voltage may be zero or another preset minimum voltage (specifically, may be a voltage value corresponding to a minimum driving current for driving the LED lamp), and the specific implementation manner of the preset time period is not limited herein.
Referring to fig. 3, fig. 3 is a block diagram of an endoscope light source provided by the present application, where the endoscope light source includes an LED lamp and a driving circuit of the LED lamp, and an output end of the driving circuit is connected to a driving end of the LED lamp.
Specifically, the endoscope light source may include, but is not limited to, a plurality of LED lamps and a plurality of LED lamp driving circuits corresponding to the plurality of LED lamps one to one, and each LED lamp driving circuit drives one LED lamp. In the endoscope light source, the driving circuit of each LED lamp can reuse the same control module, and the control module may be, but is not limited to, a processor in the endoscope light source. For other descriptions of the endoscope light source, refer to the above embodiments, and the detailed description thereof is omitted here.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A driving circuit of an LED lamp, comprising:
a DC-DC conversion module for outputting a target voltage;
the linear driving module comprises N linear power devices connected in parallel, each linear power device comprises an input end, an output end and a control end, the input ends of the N linear power devices are connected with each other to form the input end of the linear driving module, the output ends of the N linear power devices are connected with each other to form the output end of the linear driving module, the input end of the linear driving module is connected with the output end of the DC-DC conversion module, the output end of the linear driving module is connected with the LED lamp, and N is an integer greater than 1;
and the control module comprises a first output end, the first output end is respectively connected with the control ends of the N linear power devices and is used for respectively controlling the N linear power devices according to the expected current so that the output end of the linear driving module outputs the expected current to drive the LED lamp.
2. The LED lamp driver circuit of claim 1, wherein the control module further comprises a second output terminal connected to the control terminal of the dc-dc converter module;
the control module is further configured to:
and controlling the DC-DC conversion module to output the target voltage according to the expected current.
3. The LED lamp driver circuit according to claim 2, wherein the dc-dc conversion module comprises:
and the input end of the DC-DC circuit is connected with the output end of a power supply so as to receive a first voltage output by the power supply, the control end of the DC-DC circuit is connected with the second output end of the control module so as to convert the first voltage into the target voltage according to a control signal of the control module, and the output end of the DC-DC circuit is the output end of the DC-DC conversion module.
4. The LED lamp driving circuit according to claim 3, wherein the dc-dc conversion module further comprises:
the input end of the voltage detection circuit is connected with the output end of the DC-DC circuit and is used for detecting the current output voltage of the DC-DC circuit;
and the input end of the voltage feedback control circuit is connected with the output end of the voltage detection circuit, the output end of the voltage feedback control circuit is connected with the control end of the DC-DC circuit, and the voltage feedback control circuit is used for carrying out closed-loop regulation on the output voltage of the DC-DC circuit according to the difference value between the current output voltage and the target voltage so as to stabilize the output voltage of the DC-DC circuit at the target voltage.
5. The LED lamp driving circuit according to claim 2, further comprising:
the input end of the pressure difference detection module is respectively connected with the input end and the output end of the linear power device, and the output end of the pressure difference detection module is connected with the control module and used for detecting the pressure difference between the input end and the output end of the linear power device and feeding the pressure difference back to the control module;
then, the control module is further configured to:
and controlling the DC-DC conversion module to adjust the output voltage according to the voltage difference so as to maintain the voltage difference between the input end and the output end of the linear power device within a preset range.
6. The LED lamp driving circuit according to claim 5, wherein the predetermined range is 0.1V to 1V.
7. The LED lamp driving circuit according to claim 1, wherein the linear power device is a MOS transistor.
8. The LED lamp driving circuit according to any one of claims 1 to 7, wherein the output currents of N linear power devices are equal.
9. The LED lamp driver circuit of claim 8, wherein the linear driver module further comprises:
the current detection circuits are connected with the output ends of the linear power devices in a one-to-one correspondence mode, and each current detection circuit is used for detecting the current output current of the corresponding linear power device;
the output end of each current feedback control circuit is connected with the control end of the corresponding linear power device and used for carrying out closed-loop regulation on the output current of the linear power device according to the difference value of the current output current and the 1/N of the expected current so as to stabilize the output current at the 1/N of the expected current.
10. An endoscope light source, comprising an LED lamp and a driver circuit for the LED lamp as claimed in any one of claims 1 to 9, the output of the driver circuit being connected to the LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221627517.XU CN218124968U (en) | 2022-06-27 | 2022-06-27 | Driving circuit of LED lamp and endoscope light source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221627517.XU CN218124968U (en) | 2022-06-27 | 2022-06-27 | Driving circuit of LED lamp and endoscope light source |
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| CN218124968U true CN218124968U (en) | 2022-12-23 |
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| CN202221627517.XU Active CN218124968U (en) | 2022-06-27 | 2022-06-27 | Driving circuit of LED lamp and endoscope light source |
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