CN109661067B - Slit lamp light illumination adjusting circuit - Google Patents
Slit lamp light illumination adjusting circuit Download PDFInfo
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- CN109661067B CN109661067B CN201811623335.3A CN201811623335A CN109661067B CN 109661067 B CN109661067 B CN 109661067B CN 201811623335 A CN201811623335 A CN 201811623335A CN 109661067 B CN109661067 B CN 109661067B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The application discloses slit lamp light illuminance regulating circuit includes: the device comprises a vision fixation lamp driving circuit, a light source driving circuit, a potentiometer and an illumination light source; the power input circuit in the light source driving circuit comprises a controllable switching device, a fifth resistor and a sixth resistor, and the control adjusting circuit comprises a third resistor and a second capacitor; this application is through setting for the resistance of fifth resistance and sixth resistance, can set for light source drive circuit's maximum output current value, through setting for the capacitance value of third resistance and resistance value and second electric capacity, can set for the switching frequency of light source driver chip, thereby according to light source drive circuit's maximum output current value and light source driver chip's switching frequency, obtain the upper limit and the lower limit of the illumination intensity of wideer illumination source, reuse the voltage of potentiometre control light source driver chip's IADJ pin, realize the regulation to illumination intensity, make light source drive circuit can drive illumination source and change in wideer illumination intensity interval.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to a slit lamp illumination adjusting circuit.
Background
With the rapid development of market economy, slit lamps are popularized in the market.
With the rapid development of computer technology and digital imaging technology, the novel photographic slit lamp is continuously renewed in flower shape, wherein the application of a digital camera is highly appreciated, a picture report and a character diagnosis can be printed on the same report sheet, and an inspection report can be found out immediately.
However, in the prior art, the minimum illumination intensity of the slit-lamp light source is above 2000LX, and the range of the illumination intensity which can be provided is difficult to meet the market demand.
Therefore, there is a need for a slit lamp with a wider range of light intensities.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a slit lamp illumination adjusting circuit, which can make the illumination intensity of a light source change in a wider range. The specific scheme is as follows:
a slit lamp light illumination adjustment circuit, comprising: the device comprises a vision fixation lamp driving circuit, a light source driving circuit, a potentiometer and an illumination light source;
the vision fixation lamp driving circuit is respectively connected with the light source driving circuit and the potentiometer, the potentiometer is connected with the light source driving circuit, and the light source driving circuit is connected with the illumination light source;
the light source driving circuit comprises a light source driving chip, a power input circuit, a control and regulation circuit and an output circuit; the power supply input circuit comprises a controllable switching device, a fifth resistor and a sixth resistor, and the control and regulation circuit comprises a third resistor and a second capacitor;
the fifth resistor and the sixth resistor are connected in parallel, first common ends of the fifth resistor and the sixth resistor are connected with a power supply, second common ends of the fifth resistor and the sixth resistor are connected with a CSN pin of the light source driving chip, and the resistance values of the fifth resistor and the sixth resistor are the same;
the output end of the controllable switch device is connected with the CSN pin of the light source driving chip, the control end of the controllable switch device is connected with the PGATE pin of the light source driving chip, and the input end of the controllable switch device is connected with the output circuit;
the third resistor is connected in series between the output end of the output circuit and the COFF pin of the light source driving chip, and the second capacitor is connected in series between the COFF pin of the light source driving chip and the grounding end of the light source driving chip;
setting a maximum output current value of the light source driving circuit, setting a resistance value of the third resistor and a capacitance value of the second capacitor, setting a switching frequency of the light source driving chip, and setting an upper limit and a lower limit of the illumination intensity of the illumination light source according to the maximum output current value of the light source driving circuit and the switching frequency of the light source driving chip.
Optionally, an EN pin of the light source driving chip is connected to a switch output terminal of the potentiometer, and the power supply is connected to a switch input terminal of the potentiometer.
Optionally, the light source driving circuit includes a third capacitor and a fourth resistor;
the VCC pin of the light source driving chip is connected with one end of the third capacitor, and the other end of the third capacitor, one end of the fourth resistor and the CSP pin of the light source driving chip are connected with each other;
the power input circuit comprises an eighth resistor, an eighth capacitor and a ninth capacitor;
a VIN pin of the light source driving chip is connected with one end of the eighth resistor, one end of the eighth capacitor and one end of the ninth capacitor are all connected with a power supply, and the other end of the eighth capacitor and the other end of the ninth capacitor are all grounded;
the control and regulation circuit comprises a first resistor, a second resistor and a first capacitor;
the other end of the fourth resistor, one end of the second resistor and the UVLO pin of the light source driving chip are connected with each other, the other end of the second resistor, one end of the first capacitor and one end of the first resistor are all grounded, the other end of the first resistor is connected with the EN pin of the light source driving chip, and the other end of the first capacitor is connected with the IADJ pin of the light source driving chip;
the output circuit comprises a seventh resistor, an inductor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and a diode;
the negative pole of the diode, one end of the fourth capacitor, one end of the inductor and the input end of the controllable switch device are connected with each other, the other end of the inductor, one end of the fifth capacitor, one end of the sixth capacitor and one end of the seventh resistor are connected with each other, the other end of the inductor serves as the output end of the output circuit and is connected with the illumination light source, the other end of the seventh resistor is connected with one end of the seventh capacitor, and the other end of the fourth capacitor, the positive pole of the diode, the other end of the fifth capacitor and the other end of the sixth capacitor are all grounded.
Optionally, the fixation lamp driving circuit includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a linear regulator;
the one end of first electric capacity, the one end of second electric capacity the first end and the third end interconnect of linear voltage regulator, the fourth end of linear voltage regulator, the one end of third electric capacity with the one end interconnect of fourth electric capacity, the other end of first electric capacity the other end of second electric capacity the second end of linear voltage regulator the other end of third electric capacity with the other end of fourth electric capacity all grounds.
Optionally, the illumination light source may be an LED lamp.
Optionally, the illumination light source is mounted on a light source circuit board, the light source circuit board is an aluminum substrate, and the illumination light source is connected to the light source driving circuit through the light source circuit board.
Optionally, the power supply further comprises a power switch and a power indicator light connected with the power supply;
the power switch is used for controlling whether the power supply supplies power to each power consumption device;
the power indicator light is used for prompting whether the power supply supplies power or not.
Optionally, the device further comprises a fixation lamp connected with the fixation lamp driving circuit.
Optionally, the fixation lamp driving circuit and the light source driving circuit are mounted on a control circuit board, and the control circuit board is mounted inside the box body.
The invention also discloses a slit-lamp microscope which comprises the slit-lamp illumination adjusting circuit.
In the invention, the slit lamp illumination adjusting circuit comprises: the device comprises a vision fixation lamp driving circuit, a light source driving circuit, a potentiometer and an illumination light source; the vision fixation lamp driving circuit is respectively connected with the light source driving circuit and the potentiometer, the potentiometer is connected with the light source driving circuit, and the light source driving circuit is connected with the lighting source; the light source driving circuit comprises a light source driving chip, a power input circuit, a control regulating circuit and an output circuit; the power supply input circuit comprises a controllable switching device, a fifth resistor and a sixth resistor, and the control regulating circuit comprises a third resistor and a second capacitor; the fifth resistor and the sixth resistor are connected in parallel, first public ends of the fifth resistor and the sixth resistor are connected with the power supply, second public ends of the fifth resistor and the sixth resistor are connected with a CSN pin of the light source driving chip, and the resistance values of the fifth resistor and the sixth resistor are the same; the output end of the controllable switch device is connected with a CSN pin of the light source driving chip, the control end of the controllable switch device is connected with a PGATE pin of the light source driving chip, and the input end of the controllable switch device is connected with the output circuit; the third resistor is connected in series between the output end of the output circuit and the COFF pin of the light source driving chip, and the second capacitor is connected in series between the COFF pin of the light source driving chip and the grounding end of the light source driving chip; the maximum output current value of the light source driving circuit is set by setting the resistance values of the fifth resistor and the sixth resistor, the resistance value of the third resistor and the capacitance value of the second capacitor are set, the switching frequency of the light source driving chip is set, and the upper limit and the lower limit of the illumination intensity of the illumination light source are set according to the maximum output current value of the light source driving circuit and the switching frequency of the light source driving chip.
According to the invention, the maximum output current value of the light source driving circuit can be set by setting the resistance values of the fifth resistor and the sixth resistor connected at the CSN pin of the light source driving chip in the light source driving circuit, the switching frequency of the light source driving chip can be set by setting the third resistor and the resistance value connected with the COFF pin of the light source driving chip and the capacitance value of the second capacitor, so that the wider upper limit and lower limit of the illumination intensity of the illumination light source can be obtained according to the maximum output current value of the light source driving circuit and the switching frequency of the light source driving chip, and the voltage of the IADJ pin of the light source driving chip is controlled by using the potentiometer, so that the adjustment of the illumination intensity is realized, and the light source driving circuit can drive the illumination light source to change in a wider illumination intensity interval.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a topological diagram of a light source driving circuit of a slit lamp illumination adjusting circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a slit lamp illumination adjusting circuit according to an embodiment of the present invention;
FIG. 3 is a topology diagram of a fixation lamp driving circuit of a slit lamp illumination adjusting circuit disclosed by the embodiment of the invention;
FIG. 4 is a schematic structural diagram of a terminal of a potentiometer according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power adapter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
The embodiment of the invention discloses a slit lamp illumination adjusting circuit, which is shown in a figure 1 and a figure 2 and comprises: the device comprises a fixation lamp driving circuit 1, a light source driving circuit 2, a potentiometer 3 and an illumination light source 4;
the fixation lamp driving circuit 1 is respectively connected with the light source driving circuit 2 and the potentiometer 3, the potentiometer 3 is connected with the light source driving circuit 2, and the light source driving circuit 2 is connected with the illumination light source 4;
the light source driving circuit 2 comprises a light source driving chip U1, a power input circuit 21, a control and regulation circuit 22 and an output circuit 23; the power input circuit 21 comprises a controllable switching device Q1, a fifth resistor R5 and a sixth resistor R6, and the control and regulation circuit 22 comprises a third resistor R3 and a second capacitor C2;
an IADJ pin of the light source driving chip U1 is connected with a variable resistance output terminal of the potentiometer 3, and a variable resistance input terminal of the potentiometer 3 is connected with the output end of the fixation lamp driving circuit 1;
the fifth resistor R5 and the sixth resistor R6 are connected in parallel, first common ends of the fifth resistor R5 and the sixth resistor R6 are connected with a power supply, second common ends of the fifth resistor R5 and the sixth resistor R6 are connected with a CSN pin of the light source driving chip U1, and the fifth resistor R5 and the sixth resistor R6 are the same in resistance;
the output end of the controllable switching device Q1 is connected with the CSN pin of the light source driving chip U1, the control end of the controllable switching device Q1 is connected with the PGATE pin of the light source driving chip U1, and the input end of the controllable switching device Q1 is connected with the output circuit 23;
the third resistor R3 is connected in series between the output terminal of the output circuit 23 and the COFF pin of the light source driving chip U1, and the second capacitor C2 is connected in series between the COFF pin of the light source driving chip U1 and the ground terminal of the light source driving chip U1.
Specifically, after the light source driving chip U1 adopts the above connection manner, the maximum output current value of the light source driving circuit 2 can be set by setting the resistance values of the fifth resistor R5 and the sixth resistor R6, the switching frequency of the light source driving chip U1 can be set by setting the resistance value of the third resistor R3 and the capacitance value of the second capacitor C2, and further, the upper and lower limits of the output voltage and the upper and lower limits of the output current of the light source driving chip U1 are obtained according to the maximum output current value of the light source driving circuit 2 and the switching frequency of the light source driving chip U1, so as to set the upper and lower limits of the wider illumination intensity of the illumination source 4, and then, the illumination intensity of the illumination source 4 is changed by matching with the potentiometer 3 connected between the IADJ pin (adjustable voltage pin) of the light source driving chip U1 and the output end of the solid-view lamp driving circuit.
Specifically, referring to fig. 4, the fixation lamp driving circuit 1, the potentiometer 3 and the light source driving chip U1 are connected in series, the fixation lamp driving circuit 1 supplies power to the potentiometer 3 through the variable resistor input terminal J1-1 of the potentiometer 3, the potentiometer 3 is connected to the IADJ pin of the light source driving chip U1 through the variable resistor output terminal J1-2, by adjusting the resistance of the adjustable varistor in series between the variable resistor output terminal J1-2 and the variable resistor ground terminal J1-3 of the potentiometer 3, the voltage input from the variable resistance input terminal J1-1 is divided, so that the voltage output from the variable resistance output terminal J1-2 is adjusted, the voltage output to an IADJ pin is regulated and controlled, and further, the output voltage and the output current of the light source driving chip U1 are changed, thereby realizing the change of the illumination intensity of the illumination light source 4.
It can be understood that the variation range of the illumination intensity of the illumination light source 4 is based on the upper limit and the lower limit of the illumination intensity of the illumination light source 4 set by the fifth resistor R5, the sixth resistor R6, the third resistor R3 and the second capacitor C2, for example, the upper limit of the illumination intensity is 214500LX, and the lower limit of the illumination intensity is 500LX, and the illumination intensity adjustment in the range of 500LX to 214500LX can be realized by the potentiometer 3; the light source driving chip U1 may be an LM3409 chip, the illumination light source 4 may be an LED lamp, and the controllable switching device Q1 may be a P-MOS transistor.
It can be seen that, in the embodiment of the invention, by using the fifth resistor R5 and the sixth resistor R6 connected to the CSN pin of the light source driving chip U1 in the light source driving circuit 2, by setting the resistance values of the fifth resistor R5 and the sixth resistor R6, the maximum output current value of the light source driving circuit 2 can be set, and by setting the resistance value and the capacitance value of the third resistor R3 and the second capacitor C2 connected to the COFF pin of the light source driving chip U1, the switching frequency of the light source driving chip U1 can be set, therefore, according to the maximum output current value of the light source driving circuit 2 and the switching frequency of the light source driving chip U1, the upper limit and the lower limit of the illumination intensity of the wider illumination light source 4 are obtained, the potentiometer 3 is used for controlling the voltage of the IADJ pin of the light source driving chip U1, the illumination intensity is adjusted, and the light source driving circuit 2 can drive the illumination light source 4 to change in a wider illumination intensity interval.
The embodiment of the invention discloses a specific slit lamp illumination adjusting circuit, and compared with the previous embodiment, the embodiment further explains and optimizes the technical scheme. Referring to fig. 1 to 5, specifically:
in the prior art, the illumination light source 4 cannot be turned off alone, for example, when only a scene of a fixation lamp is used, the illumination light source 4 still needs to be turned on, which causes energy waste, for this reason, an EN pin (enable pin) of the light source driving chip U1 is connected with a switch output terminal of the potentiometer 3, and a power supply is connected with a switch input terminal J1-4 of the potentiometer 3; an on-off pin is connected between a switch input terminal J1-4 and a switch output terminal J1-5 of the potentiometer 3, and the on-off pin between the switch input terminal J1-4 and the switch output terminal J1-5 is controlled to be closed or opened, so that whether the EN pin of the light source driving chip U1 can be electrified or not is controlled, when the switch of the potentiometer 3 is controlled to be closed, the voltage of the EN pin of the light source driving chip U1 is power voltage, the light source driving chip U1 works to drive the illumination light source 4 to work, when the switch of the potentiometer 3 is controlled to be opened, the voltage of the EN pin of the light source driving chip U1 is zero, the light source driving chip U1 does not work, and the illumination light source 4 is extinguished; the potentiometer 3 is used for realizing the independent control of the switch of the illumination light source 4.
Further, as shown in fig. 1, the light source driving circuit 2 may specifically include a third capacitor C3 and a fourth resistor R4;
the VCC pin of the light source driving chip U1 is connected with one end of a third capacitor C3, and the other end of the third capacitor C3, one end of a fourth resistor R4 and the CSP pin of the light source driving chip U1 are connected with each other;
the power input circuit comprises an eighth resistor R8, an eighth capacitor C8 and a ninth capacitor C9;
a VIN pin of the light source driving chip U1 is connected with one end of an eighth resistor R8, one end of an eighth resistor R8, one end of an eighth capacitor C8 and one end of a ninth capacitor C9 are all connected with a power supply, and the other end of the eighth capacitor C8 and the other end of the ninth capacitor C9 are all grounded;
the control regulating circuit comprises a first resistor R1, a second resistor R2 and a first capacitor C1;
the other end of the fourth resistor R4, one end of the second resistor R2 and a UVLO pin of the light source driving chip U1 are connected with each other, the other end of the second resistor R2, one end of the first capacitor C1 and one end of the first resistor R1 are all grounded, the other end of the first resistor R1 is connected with an EN pin of the light source driving chip U1, and the other end of the first capacitor C1 is connected with a DJIA pin of the light source driving chip U1;
the output circuit comprises a seventh resistor R7, an inductor L1, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7 and a diode D1;
a cathode of the diode D1, one end of the fourth capacitor C4, one end of the inductor L1, and an input end of the controllable switching device Q1 are connected to each other, the other end of the inductor L1, one end of the fifth capacitor C5, one end of the sixth capacitor C6, and one end of the seventh resistor R7 are connected to each other, the other end of the inductor L1 is connected to the illumination light source as an output end of the output circuit, the other end of the seventh resistor R7 is connected to one end of the seventh capacitor C7, and the other end of the fourth capacitor C4, an anode of the diode D1, the other end of the fifth capacitor C5, and the other end of the sixth capacitor C6 are all grounded. Further, as shown in fig. 3, the above-mentioned fixation lamp driving circuit 1 may specifically include a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a linear regulator U2; one end of the first capacitor C1, one end of the second capacitor C2, the first end and the third end of the linear regulator U2 are connected to each other, the fourth end of the linear regulator U2, one end of the third capacitor C3 and one end of the fourth capacitor C4 are connected to each other, the other end of the first capacitor C1, the other end of the second capacitor C2, the second end of the linear regulator U2, the other end of the third capacitor C3 and the other end of the fourth capacitor C4 are all grounded, and the fifth end of the linear regulator U2 is suspended.
Specifically, the illumination light source 4 may be mounted on the light source circuit board 5, and since the light source circuit board 5 with a large heat generation amount of the illumination light source 4 may be an aluminum substrate, the heat dissipation speed is increased, and the illumination light source 4 is connected to the light source driving circuit 2 through the light source circuit board 5.
It can be understood that the fixation lamp driving circuit 1 supplies power to the ADIJ pin of the light source driving chip U1 of the light source driving circuit 2, as shown in fig. 4, the output terminal of the fixation lamp driving circuit 1 is further connected to the input terminal of the fixation lamp 6 through the fixation lamp power supply terminal J1-6 of the potentiometer 3, the ground terminal of the fixation lamp 6 is connected to the fixation lamp ground terminal J1-7 of the potentiometer 3, and the fixation lamp 6 is supplied power through the fixation lamp driving circuit 1 of the potentiometer 3.
Specifically, the fixation lamp driving circuit 1 and the light source driving circuit 2 may be mounted on the control circuit board 7, the control circuit board 7 is mounted inside the box body 8, and the box body 8 is used for protecting the control circuit board 7.
Wherein, the power supply can be connected with the power supply line of the control circuit board 7 through the power input interface 10 of the box body 8 by the power adapter 9.
Specifically, in order to prompt a user that the power supply of the slit lamp is switched on currently and supply power for the independent control power supply, a power switch S1 and a power indicator X1 which are connected with the power supply can be arranged; the power switch S1 is used for controlling whether the power supply supplies power to each electric device, and the power switch S1 is connected in series between the power supply and the control circuit board 7, so that the control power supply can supply power to each electric device through the switch power switch S1; the power indicator lamp X1 is used for prompting whether a power supply supplies power, when the power switch S1 is closed, if the power supply works normally, the power indicator lamp X1 is turned on to prompt the power supply to work normally, if the power supply fails, the power indicator lamp X1 is not turned on to indicate the power failure, so that troubleshooting is convenient, for example, after the power switch S1 is closed, the lighting source 4 is not turned on, and the power indicator lamp X1 is turned on to indicate that the power supply works normally, so that a certain circuit related to the lighting source 4 fails; if the power switch S1 is closed, the power indicator lamp X1 is not lighted, indicating power failure.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The slit lamp illumination adjusting circuit provided by the invention is described in detail above, a specific example is applied in the text to explain the principle and the implementation of the invention, and the description of the above example is only used to help understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A slit lamp light illumination adjusting circuit, comprising: the device comprises a vision fixation lamp driving circuit, a light source driving circuit, a potentiometer and an illumination light source;
the vision fixation lamp driving circuit is respectively connected with the light source driving circuit and the potentiometer, the potentiometer is connected with the light source driving circuit, and the light source driving circuit is connected with the illumination light source;
the light source driving circuit comprises a light source driving chip, a power input circuit, a control and regulation circuit and an output circuit; the power supply input circuit comprises a controllable switching device, a fifth resistor and a sixth resistor, and the control and regulation circuit comprises a third resistor and a second capacitor;
an IADJ pin of the light source driving chip is connected with a variable resistance output terminal of the potentiometer, and a variable resistance input terminal of the potentiometer is connected with the output end of the fixation lamp driving circuit;
the fifth resistor and the sixth resistor are connected in parallel, first common ends of the fifth resistor and the sixth resistor are connected with a power supply, second common ends of the fifth resistor and the sixth resistor are connected with a CSN pin of the light source driving chip, and the resistance values of the fifth resistor and the sixth resistor are the same;
the output end of the controllable switch device is connected with the CSN pin of the light source driving chip, the control end of the controllable switch device is connected with the PGATE pin of the light source driving chip, and the input end of the controllable switch device is connected with the output circuit;
the third resistor is connected in series between the output end of the output circuit and the COFF pin of the light source driving chip, and the second capacitor is connected in series between the COFF pin of the light source driving chip and the grounding end of the light source driving chip;
setting a maximum output current value of the light source driving circuit, a resistance value of the third resistor and a capacitance value of the second capacitor, a switching frequency of the light source driving chip, and an upper limit and a lower limit of the illumination intensity of the illumination light source according to the maximum output current value of the light source driving circuit and the switching frequency of the light source driving chip;
the EN pin of the light source driving chip is connected with the switch output terminal of the potentiometer, and the power supply is connected with the switch input terminal of the potentiometer.
2. The slit-lamp illumination adjustment circuit according to claim 1, wherein the light source driving circuit comprises a third capacitor and a fourth resistor;
the VCC pin of the light source driving chip is connected with one end of the third capacitor, and the other end of the third capacitor, one end of the fourth resistor and the CSP pin of the light source driving chip are connected with each other;
the power input circuit comprises an eighth resistor, an eighth capacitor and a ninth capacitor;
a VIN pin of the light source driving chip is connected with one end of the eighth resistor, one end of the eighth capacitor and one end of the ninth capacitor are all connected with a power supply, and the other end of the eighth capacitor and the other end of the ninth capacitor are all grounded;
the control and regulation circuit comprises a first resistor, a second resistor and a first capacitor;
the other end of the fourth resistor, one end of the second resistor and the UVLO pin of the light source driving chip are connected with each other, the other end of the second resistor, one end of the first capacitor and one end of the first resistor are all grounded, the other end of the first resistor is connected with the EN pin of the light source driving chip, and the other end of the first capacitor is connected with the IADJ pin of the light source driving chip;
the output circuit comprises a seventh resistor, an inductor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor and a diode;
the negative pole of the diode, one end of the fourth capacitor, one end of the inductor and the input end of the controllable switch device are connected with each other, the other end of the inductor, one end of the fifth capacitor, one end of the sixth capacitor and one end of the seventh resistor are connected with each other, the other end of the inductor serves as the output end of the output circuit and is connected with the illumination light source, the other end of the seventh resistor is connected with one end of the seventh capacitor, and the other end of the fourth capacitor, the positive pole of the diode, the other end of the fifth capacitor and the other end of the sixth capacitor are all grounded.
3. The slit-lamp illumination adjusting circuit according to claim 2, wherein the fixation lamp driving circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a linear voltage regulator;
the one end of first electric capacity, the one end of second electric capacity the first end and the third end interconnect of linear voltage regulator, the fourth end of linear voltage regulator, the one end of third electric capacity with the one end interconnect of fourth electric capacity, the other end of first electric capacity the other end of second electric capacity the second end of linear voltage regulator the other end of third electric capacity with the other end of fourth electric capacity all grounds.
4. The slit-lamp illumination adjustment circuit according to claim 3, wherein the illumination light source is an LED lamp.
5. The slit lamp light illumination adjusting circuit according to claim 4, wherein the illumination light source is mounted on a light source circuit board, the light source circuit board is an aluminum substrate, and the illumination light source is connected to the light source driving circuit through the light source circuit board.
6. The slit-lamp light intensity adjusting circuit according to claim 5, further comprising a power switch and a power indicator connected to a power supply;
the power switch is used for controlling whether the power supply supplies power to each power consumption device;
the power indicator light is used for prompting whether the power supply supplies power or not.
7. The slit-lamp illumination adjusting circuit according to claim 6, further comprising a fixation lamp connected to the fixation lamp driving circuit.
8. The slit-lamp illumination adjusting circuit according to claim 7, wherein the fixation lamp driving circuit and the light source driving circuit are mounted on a control circuit board, and the control circuit board is mounted inside the box body.
9. A slit-lamp microscope comprising the slit-lamp illumination adjustment circuit according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811623335.3A CN109661067B (en) | 2018-12-28 | 2018-12-28 | Slit lamp light illumination adjusting circuit |
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| CN201811623335.3A CN109661067B (en) | 2018-12-28 | 2018-12-28 | Slit lamp light illumination adjusting circuit |
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| CN109661067A CN109661067A (en) | 2019-04-19 |
| CN109661067B true CN109661067B (en) | 2021-04-13 |
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| CN101846581A (en) * | 2010-04-20 | 2010-09-29 | 华东交通大学 | LED light source stability detector based on PLC control and detection method thereof |
| CN105636288A (en) * | 2014-10-28 | 2016-06-01 | 江苏绿扬电子仪器集团有限公司 | Automobile LED illumination driving system |
| CN206057843U (en) * | 2016-09-13 | 2017-03-29 | 西安科技大学 | The internet intelligent house control system communicated with WIFI based on bluetooth |
| CN206136390U (en) * | 2016-10-17 | 2017-04-26 | 上海新眼光医疗器械股份有限公司 | A light source drive circuit for slit lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6547394B2 (en) * | 1998-10-20 | 2003-04-15 | Victor J. Doherty | Hand-held ophthalmic illuminator |
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| CN101846581A (en) * | 2010-04-20 | 2010-09-29 | 华东交通大学 | LED light source stability detector based on PLC control and detection method thereof |
| CN105636288A (en) * | 2014-10-28 | 2016-06-01 | 江苏绿扬电子仪器集团有限公司 | Automobile LED illumination driving system |
| CN206057843U (en) * | 2016-09-13 | 2017-03-29 | 西安科技大学 | The internet intelligent house control system communicated with WIFI based on bluetooth |
| CN206136390U (en) * | 2016-10-17 | 2017-04-26 | 上海新眼光医疗器械股份有限公司 | A light source drive circuit for slit lamp |
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