CN211124356U - Infrared photoelectric sensor transmitting circuit - Google Patents
Infrared photoelectric sensor transmitting circuit Download PDFInfo
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- CN211124356U CN211124356U CN201922150949.0U CN201922150949U CN211124356U CN 211124356 U CN211124356 U CN 211124356U CN 201922150949 U CN201922150949 U CN 201922150949U CN 211124356 U CN211124356 U CN 211124356U
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Abstract
An infrared photoelectric sensor transmitting circuit comprises a power supply VCC, an infrared transmitting tube, three resistors, two capacitors, a diode, an inductor and an integrated circuit; the pin 5 and the pin 6 of the integrated circuit are connected with a power supply VCC, and a first capacitor is connected in parallel between the pin 5 of the integrated circuit and the GND 1; a first resistance between pin 7 of the integrated circuit and GND 2; a second resistance between pin 2 of the integrated circuit and GND 2; a third resistor is connected between a pin 4 of the integrated circuit and a power supply VCC; pins 1 and 3 of the integrated circuit are connected and then connected with GND 2; an inductor and an emitting diode are connected between the GND1 and the GND2 in series, a second capacitor is connected on the emitting diode in parallel, and a diode is connected between the GND1 and the GND 2; the infrared photoelectric sensor transmitting circuit formed by the integrated circuit comprises the following integrated circuits: BP 2857; the utility model provides an infrared photoelectric sensor transmitting circuit, very big reduction constant current circuit's consumption, solved constant current circuit's the phenomenon of generating heat, improved sensor transmitting circuit's reliability.
Description
Technical Field
The utility model relates to an infrared photoelectric emission circuit indicates an infrared photoelectric sensor transmitting circuit especially.
Background
In the existing infrared photoelectric sensor transmitting circuit, a resistance current-limiting circuit is generally adopted to provide current of an infrared transmitting tube, a linear constant-current integrated circuit is rarely adopted to design the infrared transmitting tube, the linear constant-current integrated circuit realizes linear constant current by adjusting voltage on an adjusting tube, and because the voltage difference between the input voltage of the infrared photoelectric sensor transmitting circuit and the voltage required by the infrared transmitting tube is very large, the voltage drop on the resistance current-limiting circuit and the linear constant-current integrated circuit is also very large, so that the problems of low constant-current efficiency, serious heating, poor reliability and the like exist.
SUMMERY OF THE UTILITY MODEL
In order to overcome not enough among the prior art, the utility model provides an infrared photoelectric sensor transmitting circuit to higher conversion efficiency reaches the purpose of invariable infrared transmitting tube electric current.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted as follows:
an infrared photoelectric sensor transmitting circuit comprises a power supply VCC, an infrared transmitting tube, three resistors, two capacitors, a diode, an inductor and an integrated circuit;
the pin 5 and the pin 6 of the integrated circuit are connected with a power supply VCC, and a first capacitor is connected in parallel between the pin 5 of the integrated circuit and the GND 1;
a first resistance between pin 7 of the integrated circuit and GND 2;
a second resistance between pin 2 of the integrated circuit and GND 2;
a third resistor is connected between a pin 4 of the integrated circuit and a power supply VCC;
an inductor and an emitting diode are connected between the GND1 and the GND2 in series, a second capacitor is connected on the emitting diode in parallel, and a diode is connected between the GND1 and the GND 2;
the infrared photoelectric sensor transmitting circuit formed by the integrated circuit comprises the following integrated circuits: BP 2857.
The utility model has the advantages that:
the utility model provides an infrared photoelectric sensor transmitting circuit, very big reduction constant current circuit's consumption, solved constant current circuit's the phenomenon of generating heat, improved sensor transmitting circuit's reliability.
Drawings
Fig. 1 is a schematic circuit diagram of the transmitting circuit of the infrared photoelectric sensor.
Detailed Description
Referring to fig. 1, an infrared photoelectric sensor transmitting circuit comprises a power supply VCC, an infrared transmitting tube, three resistors, two capacitors, a diode, an inductor and an integrated circuit;
the pin 5 and the pin 6 of the integrated circuit IC1 are connected with a power supply VCC, and a first capacitor C1 is connected between the pin 5 of the integrated circuit IC1 and GND1 in parallel;
a first resistor R1 between pin 7 of IC1 and GND 2;
a second resistor R2 between pin 2 of the IC1 and GND 2;
a third resistor R3 is connected between the pin 4 of the integrated circuit IC1 and the power supply VCC;
an inductor L1 and an emitting diode L ED1 are connected between GND1 and GND2 in series, a second capacitor C2 is connected to the emitting diode L ED1 in parallel, and a diode D1 is connected between GND1 and GND 2;
the infrared photoelectric sensor transmitting circuit formed by the integrated circuit IC1 has an integrated circuit IC 1: BP 2857.
The working principle of the embodiment is as follows:
the utility model relates to an infrared photoelectric sensor transmitting circuit, which consists of a power supply VCC, an infrared transmitting tube, three resistors, two capacitors, a diode, an inductor and an integrated circuit;
after a power supply VCC of the infrared photoelectric sensor passes through a first capacitor C1, a power supply of an emitting diode L ED1 is provided for a pin 5 and a pin 6 of an integrated circuit IC1, meanwhile, the power supply of an integrated circuit IC1 is provided for a pin 4 of the integrated circuit IC1 after voltage reduction is carried out through a third resistor R3, the resistance value of a second resistor R2 is adjusted to set an initial constant current value of the emitting diode L ED1, the first resistor R1 is a current sampling resistor, a pin 1 of the integrated circuit IC1 sends out PWM (pulse width modulation) pulse, the PWM pulse is filtered through magnetoelectric conversion of an inductor L1 and a second capacitor C2, the emitting diode L ED1 is driven to emit infrared light, and the reverse peak voltage generated in the magnetoelectric conversion of the inductor L1 is released through a diode D1;
when the voltage fluctuation of the power supply VCC rises, the emission current of the emission tube L ED1 rises synchronously and is higher than a set value, the voltage on the first resistor R1 rises, the voltage of the 7-pin end of the integrated circuit IC1 rises simultaneously, the width of a PWM pulse emitted by the 1 pin of the integrated circuit IC1 is reduced, the current after the magnetic-electric conversion of the inductor L1 and the filtering of the second capacitor C2 is reduced, and the current of the emitting diode L ED1 is reduced;
similarly, when the voltage fluctuation of the power supply VCC is reduced, the width of the PWM pulse sent by the pin 1 of the integrated circuit IC1 is increased, the current of the emitting diode L ED1 rises and returns to the set value, and the purpose of constant current driving L ED1 is achieved.
Of course, those skilled in the art should realize that the above-mentioned embodiments are only used for illustrating the present invention, and not for limiting the present invention, and that all the changes and modifications to the above-mentioned embodiments are within the scope of the appended claims as long as they are within the true spirit of the present invention.
Claims (1)
1. An infrared photoelectric sensor transmitting circuit is characterized by comprising a power supply VCC, an infrared transmitting tube, four resistors, three capacitors, a diode, an inductor and an integrated circuit;
the pin 5 and the pin 6 of the integrated circuit IC1 are connected with a power supply VCC, and a first capacitor C1 is connected between the pin 5 of the integrated circuit IC1 and GND1 in parallel;
a first resistor R1 between pin 7 of IC1 and GND 2;
a second resistor R2 between pin 2 of the IC1 and GND 2;
a third resistor R3 is connected between the pin 4 of the integrated circuit IC1 and the power supply VCC;
pins 1 and 3 of the integrated circuit IC1 are connected and then connected with GND 2;
an inductor L1 and an emitting diode L ED1 are connected between GND1 and GND2 in series, a second capacitor C2 is connected to the emitting diode L ED1 in parallel, and a diode D1 is connected between GND1 and GND 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922150949.0U CN211124356U (en) | 2019-12-04 | 2019-12-04 | Infrared photoelectric sensor transmitting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922150949.0U CN211124356U (en) | 2019-12-04 | 2019-12-04 | Infrared photoelectric sensor transmitting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211124356U true CN211124356U (en) | 2020-07-28 |
Family
ID=71699636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922150949.0U Active CN211124356U (en) | 2019-12-04 | 2019-12-04 | Infrared photoelectric sensor transmitting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211124356U (en) |
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2019
- 2019-12-04 CN CN201922150949.0U patent/CN211124356U/en active Active
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