Silicon photocell signal processing circuit
By introducing RC signal matching circuit, filtering amplification circuit and buffer circuit into the silicon photocell signal processing circuit, combined with the back-end filtering circuit, the problems of signal interference and power interference in the traditional silicon photocell sampling circuit are solved, and accurate analog signals are achieved collection.
Patent Information
- Application Number
- CN202420895691.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-04-26
AI Technical Summary
The traditional silicon photocell sampling circuit does not perform effective interference signal processing at the signal input and output ends, resulting in a large deviation from the actual illumination power after sampling, and is greatly affected by laser light and power interference.
A signal processing circuit including silicon photocell signal sampling circuit, filter amplification circuit, buffer circuit and back-end filter circuit was designed, and a solution combining RC signal matching circuit, filter amplification circuit, buffer circuit and back-end filter circuit was adopted. , through adjustable resistors, operational amplifiers and capacitor components, filtering of interfering signals and power interference cutoffs are achieved.
It effectively reduces laser light interference during signal input and power interference during signal amplification, ensures accurate analog signals, and improves the accuracy of signal acquisition.
Smart Images
Figure CN222147584U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of signal filtering, in particular to a silicon photocell signal processing circuit with filtering. Background Art
[0002] Silicon photocell is a device that converts light into electricity and can be used to measure laser power. The principle of using silicon photocell to detect laser power is that the silicon photocell converts the collected laser into an analog electrical signal, amplifies the electrical signal, and then converts it into a digital signal through an analog-to-digital converter. The microprocessor obtains the laser power by processing the digital signal.
[0003] The traditional silicon photovoltaic cell sampling circuit does not perform good interference signal processing at the signal input and output ends, resulting in the signal output by the signal sampling and amplification circuit being an interference signal, and the light power after being sampled by the ADC deviates greatly from the actual light power. Utility Model Content
[0004] The utility model aims at the technical problems existing in the prior art and provides a silicon photocell signal processing circuit, which can solve the influence of laser light interference on signal input and the influence of power supply interference during signal amplification to obtain an accurate analog signal.
[0005] The technical solution of the utility model for solving the above technical problems is as follows: a silicon photocell signal processing circuit, comprising: a silicon photocell signal sampling circuit, a filtering and amplifying circuit, a buffer circuit, and a back-end filtering circuit, the input and output of which are connected in sequence; the silicon photocell signal sampling circuit comprises a silicon photocell D1 and an RC signal matching circuit, wherein the RC signal matching circuit comprises an adjustable resistor R4 and a capacitor C3, the cathode of the silicon photocell D1 is grounded, and the anode serves as the output end of the silicon photocell signal sampling circuit to output a sampling signal, and the RC signal matching circuit is connected in parallel with the silicon photocell D1.
[0006] Furthermore, the filtering and amplifying circuit includes resistors R1, R2, R6, and R7, capacitors C1, C4, C5, and C8, and an operational amplifier U1A; wherein the resistors R1 and R2 are connected in series, the other end of the resistor R1 is connected to the output end of the silicon photocell signal sampling circuit, and the other end of the resistor R2 is connected to the positive input end of the operational amplifier U1A; one end of the capacitor C4 is connected to the common node of the resistors R1 and R2, and the other end is connected to the output end of the operational amplifier U1A; one end of the capacitor C5 is connected to the positive input end of the operational amplifier U1A, and the other end is grounded; one end of the capacitor C1 is connected to the voltage input end of the operational amplifier U1A, and the other end is grounded; after the capacitor C8 and the resistor R7 are connected in parallel, the two ends are respectively connected to the negative input end and the output end of the operational amplifier U1A; one end of the resistor R6 is connected to the negative input end of the operational amplifier U1A, and the other end is grounded; the voltage input end of the operational amplifier U1A is connected to the working voltage VCC, the ground end is grounded, and the output end serves as the output end of the filtering and amplifying circuit.
[0007] Furthermore, the buffer circuit includes a resistor R3, capacitors C2 and C6, and an operational amplifier U1B; wherein one end of the resistor R3 is connected to the output end of the filter amplifier circuit, and the other end is connected to the positive input end of the operational amplifier U1B; one end of the capacitor C6 is connected to the positive input end of the operational amplifier U1B, and the other end is grounded; one end of the capacitor C2 is connected to the voltage input end of the operational amplifier U1B, and the other end is grounded; the output end of the operational amplifier U1B is short-circuited with the negative input end, the voltage input end is connected to the working voltage VCC, the ground end is grounded, and the output end serves as the output end of the buffer circuit.
[0008] Furthermore, the back-end filtering circuit includes a resistor R5 and a capacitor C7; one end of the resistor R5 is connected to the output end of the buffer circuit; one end of the capacitor C7 is connected to the other end of the resistor R5, and the other end of the capacitor C7 is grounded; the common node of the resistor R5 and the capacitor C7 leads to an output pin, which serves as the output end of the back-end filtering circuit to output the processed silicon photovoltaic cell signal.
[0009] The beneficial effects of the utility model are as follows: an RC signal matching circuit is provided in the silicon photocell signal sampling circuit, and the RC signal matching circuit includes an adjustable resistor R4, which can adjust the resistance value of the resistor R4 to maximize the signal output by D1 within the distance set by the laser illumination. The front-stage interference signal can be effectively filtered through the filter amplifier circuit in the main circuit, the power supply interference signal can be cut off by the buffer circuit, and the back-end filter circuit can filter the front-stage power supply interference and the interference on the signal. This solution can effectively solve the influence of laser light interference on signal input and the influence of power supply interference during signal amplification, so as to obtain an accurate analog signal. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1A schematic diagram of a silicon photocell signal processing circuit provided by an embodiment of the utility model;
[0011] Figure 2 A topological diagram of a silicon photovoltaic cell signal processing circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION
[0012] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.
[0013] like Figure 1-2 As shown, the embodiment of the utility model provides a silicon photocell signal processing circuit, including: a silicon photocell signal sampling circuit, a filter amplifier circuit, a buffer circuit, and a back-end filter circuit, which are sequentially connected in input and output; the silicon photocell signal sampling circuit includes a silicon photocell D1 and an RC signal matching circuit, wherein the RC signal matching circuit includes an adjustable resistor R4 and a capacitor C3, the cathode of the silicon photocell D1 is grounded, and the anode serves as the output end of the silicon photocell signal sampling circuit to output a sampling signal, and the RC signal matching circuit is connected in parallel with the silicon photocell D1. By adjusting the resistance value of the resistor R4, the signal output by D1 can be maximized within the distance set by the laser illumination, thereby adjusting the collected signal to a signal that meets the collection parameters.
[0014] The filtering and amplifying circuit comprises resistors R1, R2, R6, and R7, capacitors C1, C4, C5, and C8, and an operational amplifier U1A; wherein the resistors R1 and R2 are connected in series, the other end of the resistor R1 is connected to the output end of the silicon photocell signal sampling circuit, and the other end of the resistor R2 is connected to the positive input end of the operational amplifier U1A; one end of the capacitor C4 is connected to the common node of the resistors R1 and R2, and the other end is connected to the output end of the operational amplifier U1A; one end of the capacitor C5 is connected to the positive input end of the operational amplifier U1A, and the other end is grounded; one end of the capacitor C1 is connected to the voltage input end of the operational amplifier U1A, and the other end is grounded; after the capacitor C8 and the resistor R7 are connected in parallel, the two ends are respectively connected to the negative input end and the output end of the operational amplifier U1A; one end of the resistor R6 is connected to the negative input end of the operational amplifier U1A, and the other end is grounded; the voltage input end of the operational amplifier U1A is connected to the working voltage VCC, the ground end is grounded, and the output end serves as the output end of the filtering and amplifying circuit. R1, C4, R2, C5 and U1A form a filter circuit, which can effectively filter the previous stage interference signal. R6, R7, C8 and U1A adjust the signal amplification factor and improve the circuit stability. C1 is the operational amplifier bypass coupling coupler to reduce power supply interference.
[0015] The buffer circuit includes a resistor R3, capacitors C2 and C6, and an operational amplifier U1B; wherein one end of the resistor R3 is connected to the output end of the filter amplifier circuit, and the other end is connected to the positive input end of the operational amplifier U1B; one end of the capacitor C6 is connected to the positive input end of the operational amplifier U1B, and the other end is grounded; one end of the capacitor C2 is connected to the voltage input end of the operational amplifier U1B, and the other end is grounded; the output end of the operational amplifier U1B is short-circuited with the negative input end, the voltage input end is connected to the working voltage VCC, the ground end is grounded, and the output end serves as the output end of the buffer circuit. R3 and C6 are filter capacitors and resistors, which cut off the power supply interference signal and pass the required signal; U1B is an operational amplifier, which acts as a buffer for impedance conversion (providing large input impedance and small output impedance) and buffer protection (protecting the subsequent circuit), and C2 is the bypass coupling capacitor of the buffer to reduce power supply interference.
[0016] The back-end filtering circuit includes a resistor R5 and a capacitor C7; one end of the resistor R5 is connected to the output end of the buffer circuit; one end of the capacitor C7 is connected to the other end of the resistor R5, and the other end of the capacitor C7 is grounded; the common node of the resistor R5 and the capacitor C7 leads to an output pin as the output end of the back-end filtering circuit, outputting the processed silicon photovoltaic cell signal. The back-end filtering circuit filters the interference of the front-end power supply and the interference on the signal
[0017] Although the preferred embodiments of the utility model have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the utility model.
[0018] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A silicon photocell signal processing circuit, characterized in that: include: The input and output are connected in sequence to a silicon photocell signal sampling circuit, a filter amplifier circuit, a buffer circuit, and a back-end filter circuit; the silicon photocell signal sampling circuit includes a silicon photocell D1 and an RC signal matching circuit, wherein the RC signal matching circuit includes an adjustable resistor R4 and a capacitor C3, the cathode of the silicon photocell D1 is grounded, and the anode serves as the output end of the silicon photocell signal sampling circuit to output a sampling signal, and the RC signal matching circuit is connected in parallel with the silicon photocell D1.
2. The silicon photocell signal processing circuit according to claim 1, characterized in that: The filtering and amplifying circuit comprises resistors R1, R2, R6, and R7, capacitors C1, C4, C5, and C8, and an operational amplifier U1A; wherein the resistors R1 and R2 are connected in series, the other end of the resistor R1 is connected to the output end of the silicon photocell signal sampling circuit, and the other end of the resistor R2 is connected to the positive input end of the operational amplifier U1A; one end of the capacitor C4 is connected to the common node of the resistors R1 and R2, and the other end is connected to the output end of the operational amplifier U1A; one end of the capacitor C5 is connected to the positive input end of the operational amplifier U1A, and the other end is grounded; one end of the capacitor C1 is connected to the voltage input end of the operational amplifier U1A, and the other end is grounded; after the capacitor C8 and the resistor R7 are connected in parallel, the two ends are respectively connected to the negative input end and the output end of the operational amplifier U1A; one end of the resistor R6 is connected to the negative input end of the operational amplifier U1A, and the other end is grounded; the voltage input end of the operational amplifier U1A is connected to the working voltage VCC, the ground end is grounded, and the output end serves as the output end of the filtering and amplifying circuit.
3. The silicon photocell signal processing circuit according to claim 1, characterized in that: The buffer circuit includes a resistor R3, capacitors C2 and C6, and an operational amplifier U1B; wherein one end of the resistor R3 is connected to the output end of the filter amplifier circuit, and the other end is connected to the positive input end of the operational amplifier U1B; one end of the capacitor C6 is connected to the positive input end of the operational amplifier U1B, and the other end is grounded; one end of the capacitor C2 is connected to the voltage input end of the operational amplifier U1B, and the other end is grounded; the output end of the operational amplifier U1B is short-circuited with the negative input end, the voltage input end is connected to the working voltage VCC, the ground end is grounded, and the output end serves as the output end of the buffer circuit.
4. The silicon photocell signal processing circuit according to claim 1, characterized in that: The back-end filtering circuit includes a resistor R5 and a capacitor C7; one end of the resistor R5 is connected to the output end of the buffer circuit; one end of the capacitor C7 is connected to the other end of the resistor R5, and the other end of the capacitor C7 is grounded; the common node of the resistor R5 and the capacitor C7 leads to an output pin, which serves as the output end of the back-end filtering circuit to output the processed silicon photovoltaic cell signal.