CN212646470U - Light source module of infrared carbon and sulfur analyzer - Google Patents
Light source module of infrared carbon and sulfur analyzer Download PDFInfo
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- CN212646470U CN212646470U CN202021230897.4U CN202021230897U CN212646470U CN 212646470 U CN212646470 U CN 212646470U CN 202021230897 U CN202021230897 U CN 202021230897U CN 212646470 U CN212646470 U CN 212646470U
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Abstract
The utility model relates to the field of carbon and sulfur analysis, in particular to a light source module of an infrared carbon and sulfur analyzer, which comprises an infrared light source and a motor, wherein the input end of the infrared light source is provided with a constant power circuit, and the input end of the motor is provided with a voltage stabilizing circuit; the constant power circuit comprises a constant voltage circuit and a constant current circuit; the constant voltage circuit comprises a DC-DC voltage reduction circuit and an LC filter circuit, wherein the input end of the DC-DC voltage reduction circuit is connected with a power supply, the output end of the DC-DC voltage reduction circuit is connected with the input end of the LC filter circuit, the output end of the LC filter circuit is connected with the power supply end of the infrared light source, and the output end of the LC filter circuit is also connected with the feedback end of the DC-DC voltage reduction circuit to feed back the output voltage to the DC-DC voltage reduction circuit; the input end of the constant current circuit is used for inputting an infrared light source control signal, and the output end of the constant current circuit is connected with the infrared light source control end; the voltage stabilizing circuit is used for stabilizing the power supply voltage of the motor and is arranged between the power supply and the power end of the motor. The utility model discloses volatility is little, and light source stability is good.
Description
Technical Field
The utility model relates to a carbon sulphur analysis field especially relates to an infrared carbon sulphur analyzer's light source module.
Background
The infrared carbon and sulfur analyzer is characterized in that infrared light generated by an infrared light source is modulated by a light cutting motor with a light cutting sheet, then the infrared light is changed into pulse light which acts on a carbon infrared sensor through a carbon absorption tube and acts on a sulfur infrared sensor through a sulfur absorption tube, referring to fig. 2, the light source belongs to a pure resistance load, the pure resistance load can change along with temperature change and load material loss, the resistance value change of the load can cause the current or voltage of the load to change, and therefore the load power changes; in the light emitting process of the light source, the temperature can rise, so that the equivalent resistance value of the light source is changed; along with the consumption of light source materials, the load resistance value also changes, the light intensity changes, and output signals of the infrared gas sensor and the infrared gas detection instrument fluctuate to influence the measurement precision.
Disclosure of Invention
The utility model aims at providing a light source module of infrared carbon sulphur analysis appearance, the volatility is little, and light source stability is good.
For solving the above technical problem, the technical scheme of the utility model is that: the light source module of the infrared carbon sulfur analyzer comprises an infrared light source emitting infrared light and a motor driving a light cutting sheet to change the infrared light into alternating infrared light, wherein the input end of the infrared light source is provided with a constant power circuit, and the input end of the motor is provided with a voltage stabilizing circuit;
the constant power circuit comprises a constant voltage circuit for keeping the working voltage of the infrared light source constant and a constant current circuit for keeping the working current of the infrared light source constant; the constant voltage circuit comprises a DC-DC voltage reduction circuit and an LC filter circuit, wherein the input end of the DC-DC voltage reduction circuit is connected with a power supply, the output end of the DC-DC voltage reduction circuit is connected with the input end of the LC filter circuit, the output end of the LC filter circuit is connected with the power supply end of the infrared light source, and the output end of the LC filter circuit is also connected with the feedback end of the DC-DC voltage reduction circuit to feed back the output voltage to the DC-DC voltage reduction circuit; the input end of the constant current circuit is used for inputting an infrared light source control signal, and the output end of the constant current circuit is connected with the infrared light source control end;
the voltage stabilizing circuit is used for stabilizing the power supply voltage of the motor and is arranged between the power supply and the power end of the motor.
According to the scheme, the DC-DC voltage reduction circuit comprises a switch power supply chip U1 and voltage division resistors R1 and R2, wherein the power supply input end of the switch power supply chip U1 is connected with a power supply to obtain VCC, and the output end of the switch power supply chip U1 is connected with the input end of the LC filter circuit; one end of the resistor R2 is connected to the output end of the LC filter circuit, the other end of the resistor R2 is connected in series with the resistor R1 and then grounded, and the middle node of the resistors R1 and R2 is connected to the feedback end of the switching power supply chip U1.
According to the scheme, the LC filter circuit comprises an inductor L1, a grounding capacitor C4 and a cross-over capacitor CAP, wherein the input end of the inductor L1 is connected with the output end of the switching power supply chip U1, the output end of the inductor L1 is connected with the cross-over capacitor CAP and then grounded, and the grounding capacitor C4 is connected with the cross-over capacitor CAP in parallel; the output end of the inductor L1 serving as an LC filter circuit is also connected to one end of the voltage dividing resistor R2 and used for feeding back voltage; the direct current with interference signals passes through the LC filter circuit, most of the alternating current interference signals are prevented by the inductor from being absorbed and changed into magnetic induction and heat energy, most of the rest alternating current interference signals are bypassed to the ground by the capacitor, the effect of the interference signals can be inhibited, and the relatively pure direct current is obtained at the output end.
According to the scheme, the MP2359 is adopted by the switching power supply chip U1.
According to the scheme, the constant current circuit comprises a current driving chip U2, and a current driving chip U2 adopts BC R421U.
According to the scheme, the voltage stabilizing circuit adopts the voltage stabilizer U3, and the voltage stabilizer U3 adopts the LM 317.
The utility model discloses following beneficial effect has: the utility model adopts the constant power circuit at the input end of the infrared light source, effectively reduces the fluctuation of the light intensity output by the light source, solves the problem that the output power of the traditional infrared light source is unstable in the constant voltage and constant current control circuit, and the constant power circuit can ensure that the luminous intensity of the light source with different resistance values fluctuates in a smaller range, thereby reducing the dispersibility of the infrared sensor; the method has a good adjusting effect on the light source intensity difference generated by long-term light source loss, so that the baseline drift of the infrared sensor is inhibited, and the stability is good; the utility model discloses increased voltage stabilizing circuit at the motor input, realized the steady voltage to motor operating voltage, noise suppression, thereby reinforcing motor pivoted stability guarantees the stability of light source.
Drawings
FIG. 1 is a schematic block diagram of the overall structure of the embodiment of the present invention;
FIG. 2 is a schematic diagram of a prior art IR light source;
FIG. 3 is a schematic circuit diagram of a constant voltage circuit according to the present embodiment;
FIG. 4 is a schematic circuit diagram of a constant current circuit according to the present embodiment;
FIG. 5 is a schematic diagram illustrating an internal principle of the current driving chip in this embodiment;
FIG. 6 is a schematic circuit diagram of the voltage regulator circuit of the present embodiment.
Reference numerals:
1. a constant power circuit; 101. a constant voltage circuit; 102. a constant current circuit; 2. a voltage stabilizing circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 6, the present invention relates to a light source module of an infrared carbon sulfur analyzer, the light source module includes an infrared light source emitting infrared light and a motor driving a light-cutting sheet to change the infrared light into alternating infrared light, the input end of the infrared light source is provided with a constant power circuit 1, and the input end of the motor is provided with a voltage stabilizing circuit 2;
the constant power circuit 1 includes a constant voltage circuit 101 for keeping constant an operating voltage of the infrared light source and a constant current circuit 102 for keeping constant an operating current of the infrared light source; the constant voltage circuit 101 comprises a DC-DC voltage reduction circuit and an LC filter circuit, wherein the input end of the DC-DC voltage reduction circuit is connected with a power supply, the output end of the DC-DC voltage reduction circuit is connected with the input end of the LC filter circuit, the output end of the LC filter circuit is connected with the power supply end of the infrared light source, and the output end of the LC filter circuit is also connected with the feedback end of the DC-DC voltage reduction circuit to feed back the output voltage to the DC-DC voltage reduction circuit; the input end of the constant current circuit 102 is used for inputting infrared light source control signals, and the input end of the constant current circuit 102 is connected with the infrared light source control end.
The DC-DC voltage reduction circuit comprises a switch power supply chip U1 and voltage division resistors R1 and R2, in the embodiment, the switch power supply chip U1 adopts MP2359, a power supply input end 5 pin of the switch power supply chip U1 is connected to a power supply to obtain VCC, a power supply input end 5 pin of the switch power supply chip U1 is also connected with a grounding capacitor C2 and then grounded, and two ends of the grounding capacitor C2 are also connected with a grounding capacitor C3 in parallel; a resistor R3 is connected in series between a power input end 5 pin and an enable end 4 pin of the switching power supply chip U1; one end of the resistor R2 is connected with the output end of the LC filter circuit to obtain a feedback voltage VCC-FB, the other end of the resistor R2 is connected with the resistor R1 in series and then grounded, and the middle node of the resistors R1 and R2 is connected with the feedback end pin 3 of the switching power supply chip U1; a capacitor C1 is connected between a pin 1 of the switching power supply chip U1 and a pin 6 of the output end of the U1, the pin 6 of the output end of the switching power supply chip U1 is connected with the Schottky diode SS14 in series and then grounded, and the anode of the Schottky diode SS14 is grounded; and the pin 6 of the output end of the switching power supply chip U1 is connected with the input end of the LC filter circuit. The DC-DC voltage reduction circuit adopts a switching power supply chip MP2359 to reduce the voltage of 9V direct current and stabilize the voltage to 5.7V, the conversion efficiency is effectively improved while the voltage ripple is controlled, and the SS14 is a Schottky diode and is used as a rectifying diode of the switching power supply chip by utilizing the characteristics of short reverse recovery time and high speed.
The LC filter circuit comprises an inductor L1, a grounding capacitor C4 and a cross-over capacitor CAP, wherein the input end of the inductor L1 is connected with a pin 6 at the output end of the U1 of the switching power supply chip, the output end of the inductor L1 is connected with the cross-over capacitor CAP and then grounded, and the grounding capacitor C4 is connected with the cross-over capacitor CAP in parallel; the output end of the inductor L1 serving as an LC filter circuit is also connected to one end of the voltage dividing resistor R2 and used for providing a feedback voltage VCC-FB; the output terminal of the inductor L1 is connected to the power supply terminal of the infrared light source. The inductor L1 of 4.7 mu H and the cross-over capacitor CAP form an LC filter circuit for filtering high-frequency noise in the output voltage of the switching power supply chip U1, and the large capacitor of 220uF is also used as an energy storage capacitor, so that the influence of a load on the output voltage is reduced, and the output stability is kept.
The input end of the constant current circuit 102 is connected with a controller of the infrared light source and is used for inputting infrared light source control signals, and the output end of the constant current circuit 102 is connected with the infrared light source control end; the constant current circuit 102 includes a current driver chip U2, and the current driver chip U2 is a current driver chip BCR421U manufactured by Infineon corporation, germany, which provides a stable output current of up to 150 mA. A pin 1 of the current driving chip U2 is connected with a controller of the infrared light source, and pins 2, 3 and 5 of an output end of the current driving chip U2 are connected with a control end of the infrared light source; fig. 5 shows the internal structure of the current-driven chip BCR421U, pin 1 of the current-driven chip U2 being used for inputting the base input voltage; the infrared light source is connected with the collector of the transistor, the current flowing through the light source is the collector current of the transistor, which is about equal to the emitter current, as can be seen from the figure, the emitter potential, i.e. pin No. 6, is determined by the base potential, the emitter potential is a fixed value under the condition of a certain base voltage, and the emitter current is a fixed value at a certain emitter resistance, i.e. equivalent to a constant current source.
With reference to fig. 1 and 6, the voltage stabilizing circuit 2 is used for stabilizing the power supply voltage of the motor, and the voltage stabilizing circuit 2 is disposed between the power supply and the power end of the motor. In this embodiment, the voltage regulator circuit 2 adopts the LM317 voltage regulator U3, which not only has the simple form of a fixed three-stage voltage regulator circuit 2, but also can realize the characteristic of adjustable output voltage, and also has the advantages of wide voltage regulation range, good voltage regulation performance, low noise, high ripple rejection ratio, and the like.
The utility model adopts the constant power circuit 1 at the input end of the infrared light source, effectively reduces the fluctuation of the light intensity output by the light source, solves the problem that the output power of the traditional infrared light source is unstable in a constant voltage and constant current control circuit, and the constant power circuit 1 can ensure that the luminous intensity of the light source with different resistance values fluctuates in a smaller range, thereby reducing the dispersibility of the infrared sensor; the method has a good adjusting effect on the light source intensity difference generated by long-term light source loss, so that the baseline drift of the infrared sensor is inhibited, and the stability is good; the utility model discloses increased voltage stabilizing circuit 2 at the motor input, realized the steady voltage to motor operating voltage, noise suppression, thereby reinforcing motor pivoted stability guarantees the stability of light source.
The utility model discloses the part that does not relate to all is the same with prior art or adopts prior art to realize.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (6)
1. The utility model provides a light source module of infrared carbon sulphur analysis appearance, light source module is including the infrared light source who sends the infrared light and drive the motor that the slide becomes the alternating infrared light with the infrared light, its characterized in that: the input end of the infrared light source is provided with a constant power circuit, and the input end of the motor is provided with a voltage stabilizing circuit;
the constant power circuit comprises a constant voltage circuit for keeping the working voltage of the infrared light source constant and a constant current circuit for keeping the working current of the infrared light source constant; the constant voltage circuit comprises a DC-DC voltage reduction circuit and an LC filter circuit, wherein the input end of the DC-DC voltage reduction circuit is connected with a power supply, the output end of the DC-DC voltage reduction circuit is connected with the input end of the LC filter circuit, the output end of the LC filter circuit is connected with the power supply end of the infrared light source, and the output end of the LC filter circuit is also connected with the feedback end of the DC-DC voltage reduction circuit to feed back the output voltage to the DC-DC voltage reduction circuit; the input end of the constant current circuit is used for inputting an infrared light source control signal, and the output end of the constant current circuit is connected with the infrared light source control end;
the voltage stabilizing circuit is used for stabilizing the power supply voltage of the motor and is arranged between the power supply and the power end of the motor.
2. The light source module of the infrared carbon sulfur analyzer of claim 1, characterized in that: the DC-DC voltage reduction circuit comprises a switch power supply chip U1 and voltage division resistors R1 and R2, wherein the power supply input end of the switch power supply chip U1 is connected with a power supply to obtain VCC, and the output end of the switch power supply chip U1 is connected with the input end of the LC filter circuit; one end of the resistor R2 is connected to the output end of the LC filter circuit, the other end of the resistor R2 is connected in series with the resistor R1 and then grounded, and the middle node of the resistors R1 and R2 is connected to the feedback end of the switching power supply chip U1.
3. The light source module of the infrared carbon sulfur analyzer of claim 2, characterized in that: the LC filter circuit comprises an inductor L1, a grounding capacitor C4 and a cross-over capacitor CAP, wherein the input end of the inductor L1 is connected with the output end of the switching power supply chip U1, the output end of the inductor L1 is connected with the cross-over capacitor CAP and then grounded, and the grounding capacitor C4 is connected with the cross-over capacitor CAP in parallel; the output end of the inductor L1 is used as an LC filter circuit and is also connected to one end of the voltage dividing resistor R2 for voltage feedback.
4. The light source module of the infrared carbon sulfur analyzer of claim 2, characterized in that: the switching power supply chip U1 employs MP 2359.
5. The light source module of the infrared carbon sulfur analyzer of claim 1, characterized in that: the constant current circuit comprises a current driving chip U2, and a current driving chip U2 adopts BCR 421U.
6. The light source module of the infrared carbon sulfur analyzer of claim 1, characterized in that: voltage regulator U3 is used as the voltage regulator, and LM317 is used as the voltage regulator U3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021230897.4U CN212646470U (en) | 2020-06-29 | 2020-06-29 | Light source module of infrared carbon and sulfur analyzer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021230897.4U CN212646470U (en) | 2020-06-29 | 2020-06-29 | Light source module of infrared carbon and sulfur analyzer |
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| CN212646470U true CN212646470U (en) | 2021-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116170917A (en) * | 2023-03-28 | 2023-05-26 | 江苏久创电气科技有限公司 | Infrared light source modulation control method and device for non-spectroscopic infrared sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116170917A (en) * | 2023-03-28 | 2023-05-26 | 江苏久创电气科技有限公司 | Infrared light source modulation control method and device for non-spectroscopic infrared sensor |
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