CN-224218396-U - Automatic switching circuit for light power acquisition range

Abstract

The utility model discloses an automatic switching circuit for an optical power acquisition range, and belongs to the technical field of amplifying circuits. An automatic switching circuit for an optical power acquisition range comprises a photoelectric sensor PD1, a current-voltage conversion amplifying circuit, a secondary amplifying circuit, a comparison circuit and a voltage selector U4, wherein the output voltage of the current-voltage conversion amplifying circuit is divided into two paths, one path is connected to an NC1 pin of the voltage selector U4, the other path is used as the input of the secondary amplifying circuit, the output voltage of the secondary amplifying circuit is divided into two paths, one path is connected to an NO1 pin of the voltage selector U4, the other path is used as the input of the comparison circuit, the comparison circuit is used for comparing the output voltage of the secondary amplifying circuit with a preset reference voltage, the output voltage of the comparison circuit is used as the input of a I O pin of the voltage selector U4, and the voltage selector U4 selects a COM end to be connected with an NC1 or NO1 channel according to the input of the I O pin, so that the automatic switching of the optical power detection range is realized, and the optical power detection range is improved.

Inventors

• WANG SHENGXIAN
• MENG DA
• CUI YUNPENG
• BIAN ZHENHUA
• WANG PENGFEI

Assignees

• 山东中科际联光电集成技术研究院有限公司

Dates

Publication Date

20260508

Application Date

20250515

Claims (7)

1. 1. The automatic switching circuit for the light power acquisition range is characterized by comprising a photoelectric sensor PD1, a current-voltage conversion amplifying circuit, a secondary amplifying circuit, a comparison circuit and a voltage selector U4, wherein the photoelectric sensor PD1 converts a light signal into a current signal, and the current signal is used as an input of the current-voltage conversion amplifying circuit; The output voltage of the current-voltage conversion amplifying circuit is divided into two paths, one path is connected to an NC1 pin of the voltage selector U4, and the other path is used as the input of the secondary amplifying circuit; The output voltage of the secondary amplifying circuit is divided into two paths, one path is connected to the NO1 pin of the voltage selector U4, and the other path is used as the input of the comparison circuit; the comparison circuit is used for comparing the output voltage of the secondary amplification circuit with a preset reference voltage, and the output voltage of the comparison circuit is used as the input of the IO pin of the voltage selector U4; The voltage selector U4 selects to connect the COM end with the NC1 or NO1 channel according to the input of the IO pin.
2. 2. The automatic switching circuit for collecting range of optical power according to claim 1, wherein the current-voltage converting and amplifying circuit comprises an amplifier U2C, a feedback resistor R5 and a filter capacitor C1, wherein the feedback resistor R5 and the filter capacitor C1 are connected between an input-IN pin and an output OUT pin of the amplifier U2C IN a bridging manner, the photoelectric sensor PD1 is a photodiode, the anode of the photodiode is connected with a +IN pin of the amplifier U2C and is connected with the ground GND, and the cathode of the photoelectric sensor PD is connected with the-IN pin of the amplifier U2C.
3. 3. The automatic switching circuit for optical power acquisition range according to claim 1, wherein the secondary amplifying circuit comprises an amplifier U3C, a resistor R7 and a resistor R9, wherein the resistor R7 is connected between an input-IN pin and an output OUT pin of the amplifier U3C, and the resistor R9 is connected between the input-IN pin and the ground GND of the amplifier U3C.
4. 4. The automatic switching circuit for optical power acquisition range according to claim 1, wherein the comparing circuit comprises a comparator UC1, a resistor R8 and a resistor R10, wherein the resistor R8 is connected IN series with the resistor R10, and an input-IN pin of the comparator UC1 is connected between the resistor R8 and the resistor R10.
5. 5. The automatic switching circuit for optical power acquisition range according to claim 2, wherein the feedback resistor R5 is 30KΩ.
6. 6. The optical power collecting range automatic switching circuit according to claim 3, wherein the resistor R7 is 49KΩ and the resistor R9 is 1KΩ.
7. 7. The automatic switching circuit of optical power collecting range according to claim 4, wherein the resistor R8 is 2KΩ and the resistor R10 is 3KΩ.

Description

Automatic switching circuit for light power acquisition range Technical Field The utility model relates to the technical field of amplifying circuits, in particular to an automatic switching circuit for an optical power acquisition range. Background Spatial laser communication is a communication method for transmitting information such as images, voices, signals, etc. in space by using a laser beam as a carrier wave. Compared with traditional microwave communication, the laser communication has the advantages of high transmission rate, large communication capacity, strong electromagnetic interference resistance, high confidentiality and the like, and the communication terminal is small in size, low in power consumption and extremely high in practicability. As an important component in spatial laser communication, an optical amplifier is capable of amplifying an input weak optical signal to a higher power level, thereby improving the transmission distance and quality of the signal. This is critical to the problem of signal attenuation in long-haul fiber optic transmission and optical communication systems. In the traditional optical amplifier, the input light of the high-gain amplifier is required to be collected in a range of more than or equal to 50dB. The conventional optical power acquisition scheme has the maximum optical power acquisition range of-35 dB, and can only be amplified by a special logarithmic amplifier, so that no space-level logarithmic amplifier meeting the requirements can be selected at present. Through searching, the prior Chinese patent CN109600122a discloses a current-voltage conversion circuit of a variable transimpedance amplifier, which switches a larger transimpedance-transimpedance pair and detects the output value of the second-stage amplifier again when the output of the second-stage amplifier is too small, if the output is within a reasonable range, the switched transimpedance-transimpedance is indicated to be matched with the optical signal of the photodiode PD1, and if the output value of the second-stage amplifier is too small, the larger transimpedance-transimpedance pair is continuously switched. The patent discloses a scheme for realizing detection of different input lights by switching the amplifying resistor of the transimpedance amplifier through a switch, when the input light signal is suddenly enhanced, the upper computer needs longer time to judge the signal, and the voltage entering the ADC in the process can exceed the input voltage value of the ADC, so that the ADC is damaged. In view of this, we propose an optical power acquisition range automatic switching circuit. Disclosure of utility model 1. Technical problem to be solved The utility model aims to provide an automatic switching circuit for an optical power acquisition range, which is used for solving the problems in the background technology. 2. Technical proposal The utility model is realized by the following technical scheme: The automatic switching circuit of the light power collection range comprises a photoelectric sensor PD1, a current-voltage conversion amplifying circuit, a secondary amplifying circuit, a comparison circuit and a voltage selector U4, wherein the photoelectric sensor PD1 converts a light signal into a current signal, and the current signal is used as an input of the current-voltage conversion amplifying circuit; The output voltage of the current-voltage conversion amplifying circuit is divided into two paths, one path is connected to an NC1 pin of the voltage selector U4, and the other path is used as the input of the secondary amplifying circuit; The output voltage of the secondary amplifying circuit is divided into two paths, one path is connected to the NO1 pin of the voltage selector U4, and the other path is used as the input of the comparison circuit; the comparison circuit is used for comparing the output voltage of the secondary amplification circuit with a preset reference voltage, and the output voltage of the comparison circuit is used as the input of the IO pin of the voltage selector U4; The voltage selector U4 selects to connect the COM end with the NC1 or NO1 channel according to the input of the IO pin. As an alternative solution of the present disclosure, the current-voltage conversion amplifying circuit includes an amplifier U2C, a feedback resistor R5 and a filter capacitor C1, where the feedback resistor R5 and the filter capacitor C1 are connected across an input-IN pin and an output OUT pin of the amplifier U2C, and the photo sensor PD1 is a photodiode, and its anode is connected to the +in pin of the amplifier U2C and connected to the ground GND, and its cathode is connected to the-IN pin of the amplifier U2C. As an alternative to the technical solution of the present application, the secondary amplifying circuit includes an amplifier U3C, a resistor R7 and a resistor R9, where the resistor R7 is connected between an input-IN pin and an output OUT pin of the