CN113252581B - Urine analyzer constant current source controlled LED light path - Google Patents

Urine analyzer constant current source controlled LED light path Download PDF

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Publication number
CN113252581B
CN113252581B CN202110598740.XA CN202110598740A CN113252581B CN 113252581 B CN113252581 B CN 113252581B CN 202110598740 A CN202110598740 A CN 202110598740A CN 113252581 B CN113252581 B CN 113252581B
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resistor
switch
module
constant current
current source
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CN113252581A (en
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金晓峰
王晓东
杨海飞
杨豪放
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Jiangsu Garea Health Technology Co ltd
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Jiangsu Garea Health Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/483—Physical analysis of biological material
    • G01N33/487—Physical analysis of biological material of liquid biological material
    • G01N33/493—Physical analysis of biological material of liquid biological material urine
    • 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
    • H05B45/345—Current stabilisation; Maintaining constant current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/062—LED's
    • G01N2201/0621—Supply

Abstract

The invention discloses an LED light path controlled by a urine analyzer constant current source, which comprises: the LED module comprises a high-precision DAC module, a constant current source module and an LED module. The high-precision DAC module, the constant current source module and the LED module are connected in sequence, the control voltage output end of the high-precision DAC module is connected with the control input end of the constant current source module, and the current output end of the constant current source module is connected with the LED module to supply power for the LED module. The invention eliminates the individual difference of the LED and the color sensor and improves the measurement accuracy and consistency of the urine analyzer.

Description

Urine analyzer constant current source controlled LED light path
Technical Field
The invention relates to a urine analyzer, in particular to an LED light path controlled by a constant current source of the urine analyzer.
Background
Urinary component changes can be caused by various diseases such as urinary system diseases, liver diseases, diabetes and the like. Because urine specimens are easy to collect, urine analyzers have been widely used for auxiliary diagnosis of clinical diseases, monitoring of disease progression, monitoring of therapeutic effects or complications, and screening of asymptomatic people for congenital or genetic diseases.
Urine analyzers are instruments used to check the content of certain chemical components in human urine. These components include glucose, protein pH, occult blood, ketone bodies, nitrite, bilirubin, urobilinogen, red blood cells, white blood cells, and the like. The light path of the urine analyzer is the core of the whole instrument, and the principle is that after a urine test paper reaction area is irradiated by an LED lamp, light emitted by the reaction area is received by a color sensor, the color of the reaction area is measured, and the color is compared with a urine test calibration value to obtain an actual measurement value.
The current urine analysis appearance all adopts the mode of constant voltage to supply power for LED, but has the difference between different LED and the color sensor is individual, leads to different LED and the electric current that the color sensor flows to produce the error, and then makes the light intensity that corresponds produce the error, causes the test result also can produce the error, therefore the urine analysis appearance measuring accuracy and the uniformity of actual production reduce.
Disclosure of Invention
The present invention has been made in view of the above problems, so as to provide an LED light path controlled by a constant current source of a urine analyzer.
In one embodiment of the present invention, there is provided an LED light path controlled by a constant current source of a urine analyzer, the LED light path comprising: the high-precision DAC module, the constant current source module and the LED module; the high-precision DAC module, the constant current source module and the LED module are connected in sequence, the control voltage output end of the high-precision DAC module is connected with the control input end of the constant current source module, and the current output end of the constant current source module is connected with the LED module to supply power for the LED module.
Further, the urine analyzer is calibrated.
Further, the scaling operation includes: and measuring a standard color block, controlling the DAC module to adjust the size of the constant current source, and storing the current DAC to finish calibration when the color sensor obtains an expected calibration value.
Further, the constant current source module comprises an operational amplifier U1, a first capacitor C1, a second capacitor C2 and a resistor RL; the non-inverting input end of the operational amplifier is connected with a control voltage Vdac and a first end of the first capacitor C1, and a second end of the first capacitor C1 is grounded; the inverting input end of the operational amplifier is connected with the first end of the resistor RL and the cathode of the LED module, and the second end of the resistor RL is grounded; the output end of the operational amplifier is connected with the anode of the LED module; the positive power supply end of the operational amplifier is connected with a power supply voltage VDD and the first end of the second capacitor C2, the second end of the second capacitor C2 is grounded, and the negative power supply end of the operational amplifier is grounded.
Further, the DAC module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first switch K1, a second switch K2, and a third switch K3; a first end of the first resistor R1 is connected to a control voltage Vdac, a second end of the first resistor R2 is connected to a first end of the second resistor R2 and a first end of the fifth resistor R5, a second end of the second resistor R2 is connected to a first end of the third resistor R3 and a first end of the fourth resistor R4, a second end of the third resistor R3 is connected to a first end of the seventh resistor R7, and a second end of the seventh resistor R7 is grounded; a second end of the fourth resistor R4 is connected to a first end of the eighth resistor R8, a second end of the eighth resistor R8 is connected to a first end of the first switch K1, a second end of the first switch K1 is connected to a power supply voltage VDD, and a third end of the first switch K1 is grounded; a second end of the fifth resistor R5 is connected to a first end of the ninth resistor R9, a second end of the ninth resistor R9 is connected to a first end of the second switch K2, a second end of the second switch K2 is connected to a power supply voltage VDD, and a third end of the second switch K2 is grounded; a first end of the sixth resistor R6 is connected to the control voltage Vdac, a second end is connected to the first end of the third switch K3, a second end of the third switch K3 is connected to the power voltage VDD, and a third end of the third switch K3 is grounded.
Further, an input digital code controls the first switch K1, the second switch K2 and the third switch K3, the first end of each switch is selected to be connected with the second end or the third end, and the DAC module is adjusted to generate different control voltages Vdac.
Furthermore, the resistance values of the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are twice as large as those of the first resistor R1 and the second resistor R2.
Further, the internal resistance values of the first switch K1, the second switch K2 and the third switch K3 are RkThe resistance value of the seventh resistor R7 is 4RkThe resistance value of the eighth resistor R8 is 3RkThe resistance value of the ninth resistor R9 is Rk。
The beneficial technical effects of the invention are as follows:
(1) the invention discloses an LED light path controlled by a constant current source of a urine analyzer, which adopts the constant current source to supply power to LEDs, so that the current flowing through each urine analyzer is the same, and further the light intensity corresponding to the LEDs is also the same, therefore, the light path difference of all the produced urine analyzers can be controlled within a very small range, the individual difference of the LEDs and a color sensor is eliminated, and the measurement accuracy and the consistency of the urine analyzers are improved.
(2) The invention discloses a constant current source module which is simple in implementation structure, high in response speed and applied to resistive loads.
(3) The invention discloses a high-precision DAC module which can avoid the influence of switch equivalent internal resistance and improve the precision of control voltage Vdac.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an LED light path controlled by a constant current source of a urine analyzer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a constant current source module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a voltage mode ladder resistor network DAC provided in the prior art;
fig. 4 is a schematic structural diagram of a DAC module according to an embodiment of the present invention.
Detailed Description
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.
The invention is described in further detail below with reference to the figures and the embodiments.
The application discloses urine analysis appearance constant current source control's LED light path adopts a high accuracy DAC, adjusts the constant current source and produces the constant current and give the LED power supply to can the accurate control LED luminance, reduce the test result error, make the urine analysis appearance measuring accuracy and the uniformity of production better.
Fig. 1 is a schematic structural diagram of an LED light path controlled by a constant current source of a urine analyzer according to an embodiment of the present invention. As shown in FIG. 1, the LED light path controlled by the urine analyzer constant current source comprises a high-precision DAC module, a constant current source module and an LED module.
The high-precision DAC module, the constant current source module and the LED module are sequentially connected, the control voltage output end of the high-precision DAC module is connected with the control input end of the constant current source module, and the current output end of the constant current source module is connected with the LED module to supply power for the LED module.
In this embodiment, a high-precision DAC module is adjusted to generate a control voltage Vdac, which is input to a control input terminal of a constant current source module, so that the constant current source module generates a constant output current I, which is input to an LED module, and the LED module emits light to irradiate a urine test paper for urine analysis.
In urine analysis appearance's production process, all can have the difference between LED and the color sensor individuality in the different urine analysis appearance, lead to different LED and the electric current that the color sensor flows can the production error, and then make the light intensity that corresponds produce the error, cause the test result also can the production error, consequently the urine analysis appearance measuring accuracy and the uniformity of actual production reduce.
In view of the above, the invention discloses an LED light path controlled by a urine analyzer constant current source, wherein the constant current source is adopted to supply power to LEDs, so that the current flowing through each urine analyzer is the same, and further the light intensity corresponding to the LEDs is also the same, therefore, the light path difference of all produced urine analyzers can be controlled within a small range, the individual difference of the LEDs and a color sensor is eliminated, and the measurement accuracy and the consistency of the urine analyzers are improved.
Furthermore, the invention also performs calibration operation on each urine analyzer. And controlling the DAC module to adjust the size of the constant current source by measuring a standard color block, and storing the current DAC to finish calibration when the color sensor obtains a calibration value required by people. Furthermore, the light path difference of all produced urine analyzers can be controlled within a small range, the individual difference of the LED and the color sensor is eliminated, and the measurement accuracy and the consistency of the urine analyzers are improved.
Fig. 2 is a schematic structural diagram of a constant current source module according to an embodiment of the present invention. As shown in fig. 2, the constant current source module includes an operational amplifier U1, a first capacitor C1, a second capacitor C2, and a resistor RL.
The non-inverting input end of the operational amplifier is connected with the control voltage Vdac and the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded; the inverting input end of the operational amplifier is connected with the first end of the resistor RL and the cathode of the LED module, and the second end of the resistor RL is grounded; the output end of the operational amplifier is connected with the anode of the LED module; the positive power supply end of the operational amplifier is connected with the power supply voltage VDD and the first end of the second capacitor C2, the second end of the second capacitor C2 is grounded, and the negative power supply end of the operational amplifier is grounded.
In this embodiment, based on the voltage virtual short principle of the operational amplifier, the voltage V- = Vdac at the inverting input terminal of the operational amplifier, and then I- =0 according to the current virtual short characteristic of the operational amplifier, so that the current flowing through the resistor RL is the current I flowing through the LED module, and I = Vdac/R1 can be obtained. By selecting a proper resistor RL, the LED current can be controlled by the DAC.
The constant current source module is simple in implementation structure, high in response speed and applied to resistive loads.
Fig. 3 is a schematic diagram of a voltage-mode ladder resistor network DAC provided in the prior art. As shown in fig. 3, the resistor ladder network is composed of only two resistors, and the resistance values are R and 2R, respectively. The input digital code controls the switch K in each branch, when the input digital code is 1, the switch will connect the 2R resistor and the power voltage VDD, otherwise, the switch is connected to the ground. Since the internal resistance of the supply voltage VDD can be considered as zero, the resistance of each branch is equal to 2R regardless of whether the switch K is connected to VDD or ground. And the control voltage Vdac output by the DAC varies between 0 and VDD according to the condition that the input digital code is switched on to the reference voltage VDD or the ground level. If all the input digital codes are connected to the ground, the output voltage of the DAC is 0; if all the input digital codes are turned on to VDD, the control voltage Vdac at the DAC output is close to VDD.
However, in the prior art, the internal resistance of the switch K is obviously ignored, and in practical application, the internal resistance of the switch K causes the resistance of each branch circuit to be unequal, so that the influence of the internal resistance of the switch K is introduced into the output of the DAC, and the control voltage Vdac is inaccurate.
Further, aiming at the problem that the control voltage Vdac output by the DAC is inaccurate, the application introduces switch equivalent internal resistance into the DAC. An embodiment of the present invention provides a schematic structural diagram of a DAC module, as shown in fig. 4.
The DAC module comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first switch K1, a second switch K2 and a third switch K3. A first end of the first resistor R1 is connected to the control voltage Vdac, a second end of the first resistor R1 is connected to a first end of the second resistor R2 and a first end of the fifth resistor R5, a second end of the second resistor R2 is connected to a first end of the third resistor R3 and a first end of the fourth resistor R4, a second end of the third resistor R3 is connected to a first end of the seventh resistor R7, and a second end of the seventh resistor R7 is grounded; a second end of the fourth resistor R4 is connected to a first end of the eighth resistor R8, a second end of the eighth resistor R8 is connected to a first end of the first switch K1, a second end of the first switch K1 is connected to the power supply voltage VDD, and a third end of the first switch K1 is grounded; a second end of the fifth resistor R5 is connected to a first end of the ninth resistor R9, a second end of the ninth resistor R9 is connected to a first end of the second switch K2, a second end of the second switch K2 is connected to the power supply voltage VDD, and a third end of the second switch K2 is grounded; a first end of the sixth resistor R6 is connected to the control voltage Vdac, a second end is connected to a first end of the third switch K3, a second end of the third switch K3 is connected to the power voltage VDD, and a third end of the third switch K3 is grounded. The input digital code controls a first switch K1, a second switch K2 and a third switch K3, the first end of each switch is selected to be connected with the second end or the third end, and the DAC module is adjusted to generate different control voltages Vdac.
Furthermore, the resistance values of the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are twice as large as those of the first resistor R1 and the second resistor R2.
Further, the internal resistance values of the first switch K1, the second switch K2 and the third switch K3 are RkThe resistance value of the seventh resistor R7 is 4RkThe resistance value of the eighth resistor R8 is 3RkThe resistance value of the ninth resistor R9 is Rk。
According to the invention, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are arranged, so that the influence of the switch internal resistance is eliminated, and the accuracy of the control voltage Vdac is improved.
The embodiment of the invention provides an LED light path controlled by a constant current source of a urine analyzer, and a high-precision DAC is adopted to adjust the constant current source to generate constant current to supply power to an LED, so that the LED luminous brightness can be accurately controlled, the error of a test result is reduced, and the measuring accuracy and consistency of the produced urine analyzer are better. Furthermore, the invention also provides the DAC module with simple structure and high precision, and the precision of the DAC module is improved by additionally arranging the switch equivalent resistor.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (4)

1. An urine analyzer constant current source controlled LED light path, characterized in that, LED light path includes: the high-precision DAC module, the constant current source module and the LED module;
the high-precision DAC module, the constant current source module and the LED module are sequentially connected, a control voltage output end of the high-precision DAC module is connected with a control input end of the constant current source module, and a current output end of the constant current source module is connected with the LED module to supply power to the LED module;
the constant current source module comprises an operational amplifier U1, a first capacitor C1, a second capacitor C2 and a resistor RL; the non-inverting input end of the operational amplifier is connected with a control voltage Vdac and a first end of the first capacitor C1, and a second end of the first capacitor C1 is grounded; the inverting input end of the operational amplifier is connected with the first end of the resistor RL and the cathode of the LED module, and the second end of the resistor RL is grounded; the output end of the operational amplifier is connected with the anode of the LED module; the positive power supply end of the operational amplifier is connected with a power supply voltage VDD and a first end of the second capacitor C2, a second end of the second capacitor C2 is grounded, and a negative power supply end of the operational amplifier is grounded;
the DAC module comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first switch K1, a second switch K2 and a third switch K3; a first end of the first resistor R1 is connected to a control voltage Vdac, a second end of the first resistor R2 is connected to a first end of the second resistor R2 and a first end of the fifth resistor R5, a second end of the second resistor R2 is connected to a first end of the third resistor R3 and a first end of the fourth resistor R4, a second end of the third resistor R3 is connected to a first end of the seventh resistor R7, and a second end of the seventh resistor R7 is grounded; a second end of the fourth resistor R4 is connected to a first end of the eighth resistor R8, a second end of the eighth resistor R8 is connected to a first end of the first switch K1, a second end of the first switch K1 is connected to a power supply voltage VDD, and a third end of the first switch K1 is grounded; a second end of the fifth resistor R5 is connected to a first end of the ninth resistor R9, a second end of the ninth resistor R9 is connected to a first end of the second switch K2, a second end of the second switch K2 is connected to a power supply voltage VDD, and a third end of the second switch K2 is grounded; a first end of the sixth resistor R6 is connected to the control voltage Vdac, a second end of the sixth resistor R6 is connected to a first end of the third switch K3, a second end of the third switch K3 is connected to the power voltage VDD, and a third end of the third switch K3 is grounded;
the resistance values of the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are twice that of the first resistor R1 and the second resistor R2;
the internal resistance values of the first switch K1, the second switch K2 and the third switch K3 are RkThe resistance value of the seventh resistor R7 is 4RkThe resistance value of the eighth resistor R8 is 3RkThe resistance value of the ninth resistor R9 is Rk。
2. The urine analyzer constant current source controlled LED light path of claim 1, wherein the urine analyzer is calibrated.
3. The urine analyzer constant current source controlled LED light path of claim 2, wherein the scaling operation comprises: and measuring a standard color block, controlling the DAC module to adjust the size of the constant current source, and storing the current DAC to finish calibration when the color sensor obtains an expected calibration value.
4. The urine analyzer constant current source controlled LED light path as claimed in claim 1, characterized in that the input digital code controls the first switch K1, the second switch K2 and the third switch K3, the first end of each switch is connected with the second end or the third end, and the DAC module is adjusted to generate different control voltages Vdac.
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CN106535390B (en) * 2016-10-09 2018-07-31 深圳创维－Rgb电子有限公司 Constant-current driving power supply and display equipment
CN208969472U (en) * 2018-11-22 2019-06-11 湖南恩智测控技术有限公司 A kind of high-accuracy high-resolution programmable power supply circuit
CN109343433B (en) * 2018-11-22 2024-04-02 湖南恩智测控技术有限公司 High-precision high-resolution programmable power supply circuit
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