Optoelectronic detection circuit with temperature compensation and electronic device

Abstract

The utility model provides a kind of photoelectric detection circuit and electronic equipment with temperature compensation, including photoelectric conversion module, compensation voltage division module and gain adjustment module, photoelectric conversion module is used to realize the accurate conversion of optical signal to electrical signal, provides original signal basis for power detection;Compensation voltage division module is directly connected with photoelectric conversion module, can respond to the temperature change of photoelectric conversion module in real time, realizes temperature drift compensation by voltage division relationship adjustment;Gain adjustment module then carries out amplitude optimization to the electrical signal after temperature compensation, ensure signal adaptation external control chip's analog-digital conversion port input range, effectively solve the problem that traditional photoelectric detection circuit causes dark current, reverse current to increase due to temperature rise, significantly improve the stability and precision of power detection, simplify circuit connection logic at the same time, reduce integration difficulty.

Description

Technical Field

[0001] This utility model relates to the field of power detection technology, specifically to a photoelectric detection circuit and electronic device with temperature compensation. Background Technology

[0002] In the field of photoelectric power detection, photodiodes (PDs) are commonly used photoelectric conversion elements, which convert optical signals into electrical signals to achieve power measurement. However, traditional photodiodes have a significant temperature sensitivity defect in practical applications: when the test time is extended or the ambient temperature rises, the dark current and reverse current of the photodiode increase with the temperature. This causes the electrical signal output value during the photoelectric conversion process to deviate from the electrical signal value corresponding to the true optical power, ultimately resulting in an overestimation of the measured power value, which seriously affects the accuracy of power detection.

[0003] Currently, existing photoelectric detection circuits cannot compensate for device characteristic drift caused by temperature changes. Therefore, they are difficult to meet the requirements of high-precision power detection under long-term testing, high load or high temperature environments.

[0004] In other words, how to provide a photoelectric detection circuit with temperature compensation that can adaptively compensate for the temperature characteristics in photoelectric detection to eliminate the adverse effects of temperature rise on power measurement accuracy and achieve stable and high-precision photoelectric power detection is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] In view of the above-mentioned problems, the present invention aims to provide a photoelectric detection circuit and electronic device with temperature compensation, thereby solving at least one of the above-mentioned technical problems.

[0006] To at least solve the above-mentioned technical problems, in a first aspect, this utility model provides a photoelectric detection circuit with temperature compensation. The photoelectric detection circuit includes: a photoelectric conversion module, a compensation voltage divider module, and a gain adjustment module; one end of the compensation voltage divider module is connected to one end of the photoelectric conversion module and one end of the gain adjustment module, respectively; the other ends of the photoelectric conversion module and the other end of the compensation voltage divider module are both grounded; and the other end of the gain adjustment module is connected to the analog-to-digital conversion port of an external control chip.

[0007] Preferably, the photoelectric conversion module includes: Photodiode LED1, wherein the anode of photodiode LED1 is grounded; A first resistor R1 is connected at one end to the anode of the photodiode LED1, and at the other end to one end of the compensation voltage divider module and one end of the gain adjustment module.

[0008] Preferably, the compensation voltage divider module includes: Thermistor R2, one end of which is one end of the compensation voltage divider module; The third resistor R3 has one end connected to the other end of the thermistor R2, and the other end of the third resistor R3 is grounded.

[0009] Preferably, the gain adjustment module includes: power supply; Operational amplifier U1, the non-inverting input terminal of operational amplifier U1 is one end of the gain adjustment module, the positive power supply terminal of operational amplifier U1 is connected to the power supply, the negative power supply terminal of operational amplifier U1 is grounded, and the output terminal of operational amplifier U1 is the other end of the gain adjustment module; The fourth resistor R4 has one end connected to the inverting input terminal of the operational amplifier U1, and the other end grounded. The fifth resistor R5, one end of which is connected to the inverting input terminal of the operational amplifier U1; Potentiometer W1, the first fixed terminal of the potentiometer W1 is connected to the other end of the fifth resistor R5, the sliding terminal of the potentiometer W1 is connected to the second fixed terminal, and the second fixed terminal of the potentiometer W1 is connected to the output terminal of the operational amplifier U1.

[0010] Preferably, the gain adjustment module further includes: The first capacitor C1 has one end connected to the non-inverting input terminal of the operational amplifier U1, and the other end grounded. The second capacitor C2 is connected between the inverting input and output terminals of the operational amplifier U1.

[0011] Preferably, the photoelectric detection circuit further includes: A low-pass filter circuit is connected between the other end of the gain adjustment module and the analog-to-digital conversion port of the external control chip.

[0012] Preferably, the low-pass filter circuit includes: The sixth resistor R6 has one end connected to the output terminal of the operational amplifier U1, and the other end connected to the analog-to-digital conversion port of an external control chip. The third capacitor C3 has one end connected to the other end of the sixth resistor R6, and the other end of the third capacitor C3 is grounded.

[0013] Preferably, the power supply voltage is a 5V DC voltage.

[0014] Secondly, this application provides an electronic device including a temperature-compensated photoelectric detection circuit as described in any one of the first aspects.

[0015] Beneficial effects: This invention provides a temperature-compensated photoelectric detection circuit. Specifically, the temperature-compensated photoelectric detection circuit provided in this application includes a photoelectric conversion module, a compensation voltage divider module, and a gain adjustment module. One end of the compensation voltage divider module is connected to one end of the photoelectric conversion module and one end of the gain adjustment module, respectively. The other ends of the photoelectric conversion module and the compensation voltage divider module are both grounded. The other end of the gain adjustment module is connected to the analog-to-digital conversion port of an external control chip. The photoelectric conversion module is used to achieve accurate conversion of optical signals to electrical signals, providing the original signal basis for power detection. The compensation voltage divider module is directly connected to the photoelectric conversion module and can respond in real time to temperature changes in the photoelectric conversion module, adjusting the voltage division relationship to compensate for temperature drift. The gain adjustment module optimizes the amplitude of the temperature-compensated electrical signal to ensure that the signal is compatible with the input range of the analog-to-digital conversion port of the external control chip. Through a compact connection structure, these three components achieve integrated processing of "photoelectric conversion-temperature compensation-signal gain," effectively solving the problem of increased dark current and reverse current caused by temperature rise in traditional photoelectric detection circuits. This significantly improves the stability and accuracy of power detection, while simplifying circuit connection logic and reducing integration difficulty.

[0016] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the circuit structure of the photoelectric detection circuit with temperature compensation provided in Example 1. Detailed Implementation

[0019] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art are within the scope of protection of this utility model; wherein the keyword "and / or" involved in this embodiment indicates two situations, and or. In other words, A and / or B mentioned in the embodiments of this specification indicates two situations, A and B, and A or B, describing three states of A and B. For example, A and / or B means: only A is included but not B; only B is included but not A; and A and B are included.

[0020] Furthermore, in the embodiments of this specification, when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intervening component present. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intervening component present.

[0021] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0022] Example 1

[0023] Please see Figure 1 This embodiment provides a photoelectric detection circuit with temperature compensation. The photoelectric detection circuit includes: a photoelectric conversion module, a compensation voltage divider module, and a gain adjustment module. One end of the compensation voltage divider module is connected to one end of the photoelectric conversion module and one end of the gain adjustment module, respectively. The other ends of the photoelectric conversion module and the other ends of the compensation voltage divider module are both grounded. The other end of the gain adjustment module is connected to the analog-to-digital conversion port of an external control chip.

[0024] Specifically, the temperature-compensated photoelectric detection circuit provided in this application includes a photoelectric conversion module, a compensation voltage divider module, and a gain adjustment module. One end of the compensation voltage divider module is connected to one end of both the photoelectric conversion module and the gain adjustment module. The other ends of both the photoelectric conversion module and the compensation voltage divider module are grounded. The other end of the gain adjustment module is connected to the analog-to-digital conversion port of an external control chip. The photoelectric conversion module is used to achieve accurate conversion of optical signals to electrical signals, providing the original signal basis for power detection. The compensation voltage divider module is directly connected to the photoelectric conversion module and can respond in real time to temperature changes in the photoelectric conversion module, adjusting the voltage divider relationship to compensate for temperature drift. The gain adjustment module optimizes the amplitude of the temperature-compensated electrical signal, ensuring that the signal is compatible with the input range of the analog-to-digital conversion port of the external control chip. Through a compact connection structure, these three components achieve integrated processing of "photoelectric conversion-temperature compensation-signal gain," effectively solving the problem of increased dark current and reverse current caused by temperature rise in traditional photoelectric detection circuits. This significantly improves the stability and accuracy of power detection, while simplifying circuit connection logic and reducing integration difficulty.

[0025] In one possible implementation, the photoelectric conversion module includes: a photodiode LED1 and a first resistor R1; the anode of the photodiode LED1 is grounded; one end of the first resistor R1 is connected to the anode of the photodiode LED1, and the other end of the first resistor R1 is connected to one end of a compensation voltage divider module and one end of a gain adjustment module, respectively.

[0026] Specifically, the photodiode LED1 adopts a reverse bias design with the anode grounded, which can maximize the optical signal response speed and photoelectric conversion efficiency, ensuring that even weak light signals can be quickly captured and converted into detectable electrical signals. The first resistor R1 serves as the current limiting and signal transmission element for the photodiode LED1. On the one hand, it limits the device loss caused by excessive reverse current and extends the life of the photodiode. On the other hand, it achieves impedance matching between the photoelectric conversion module, the compensation voltage divider module, and the gain adjustment module, reducing distortion during signal transmission and providing high-quality raw electrical signals for subsequent temperature compensation and signal gain processing, further ensuring the detection accuracy of the entire circuit.

[0027] In one possible implementation, the compensation voltage divider module includes: a thermistor R2 and a third resistor R3; one end of the thermistor R2 is one end of the compensation voltage divider module; one end of the third resistor R3 is connected to the other end of the thermistor R2, and the other end of the third resistor R3 is grounded.

[0028] Specifically, the thermistor R2 has the characteristic of precisely changing its resistance with temperature, enabling real-time sensing of temperature fluctuations in the photoelectric conversion module (especially the photodiode LED1). In this application, the resistance of the thermistor R2 decreases with temperature; that is, when the temperature rises, the resistance of the thermistor R2 decreases accordingly. Through its voltage division with the third resistor R3, the output voltage of the compensation voltage divider module is dynamically adjusted. The third resistor R3, as a fixed voltage divider element, provides a stable voltage divider reference for the thermistor R2, ensuring the predictability and adjustment accuracy of the voltage division ratio. The two work together to achieve adaptive compensation for the temperature drift of the photoelectric conversion module, accurately offsetting the detection errors caused by increased dark current and reverse current due to temperature rise. This allows the circuit to maintain stable voltage division characteristics over a wide temperature range, providing a temperature-compensated accurate signal for subsequent signal processing. Furthermore, the parameters of the thermistor R2 are matched with those of the photodiode LED1, ensuring a stable voltage at the non-inverting input of the operational amplifier.

[0029] In one possible implementation, the gain adjustment module includes: a power supply, an operational amplifier U1, a fourth resistor R4, a fifth resistor R5, and a potentiometer W1; the non-inverting input of the operational amplifier U1 is one end of the gain adjustment module, the positive power supply terminal of the operational amplifier U1 is connected to the power supply, the negative power supply terminal of the operational amplifier U1 is grounded, and the output terminal of the operational amplifier U1 is the other end of the gain adjustment module; one end of the fourth resistor R4 is connected to the inverting input of the operational amplifier U1, and the other end of the fourth resistor R4 is grounded; one end of the fifth resistor R5 is connected to the inverting input of the operational amplifier U1; the first fixed terminal of the potentiometer W1 is connected to the other end of the fifth resistor R5, the sliding terminal of the potentiometer W1 is connected to the second fixed terminal, and the second fixed terminal of the potentiometer W1 is connected to the output terminal of the operational amplifier U1.

[0030] Specifically, operational amplifier U1, as the core amplification component, features high input impedance and low noise, enabling linear amplification of temperature-compensated weak electrical signals and ensuring that the signal amplitude meets the sampling requirements of the external control chip's analog-to-digital conversion port. The fourth resistor R4, the fifth resistor R5, and potentiometer W1 form a feedback voltage divider network. By adjusting the sliding contact of potentiometer W1, the feedback coefficient can be flexibly changed, thereby precisely controlling the amplification gain of operational amplifier U1 and adapting the amplitude of the converted electrical signal to accommodate different intensities of optical signals. This module, through its precise gain controllable design, ensures effective amplification of weak signals while avoiding saturation distortion of strong signals. Furthermore, combined with the temperature compensation function of the compensation voltage divider module, it achieves high-precision, wide dynamic range signal gain adjustment.

[0031] In one possible implementation, the gain adjustment module further includes: a first capacitor C1 and a second capacitor C2; one end of the first capacitor C1 is connected to the non-inverting input terminal of the operational amplifier U1, and the other end of the first capacitor C1 is grounded; the two ends of the second capacitor C2 are connected between the inverting input terminal and the output terminal of the operational amplifier U1.

[0032] Specifically, the first capacitor C1, acting as a filter capacitor at the non-inverting input, effectively filters out high-frequency interference signals and noise transmitted from the photoelectric conversion module and the compensation voltage divider module. This prevents interference signals from entering the operational amplifier and causing signal distortion after amplification, providing a clean input signal for operational amplifier U1 and ensuring amplification accuracy. The second capacitor C2, acting as a phase compensation capacitor, optimizes the frequency response characteristics of operational amplifier U1, suppresses circuit oscillation, improves the stability of the amplifier circuit, and avoids phase shift and signal jitter caused by high-frequency signal amplification. The addition of these two capacitors further improves the performance of the gain adjustment module, enhancing both the signal's anti-interference capability and the circuit's operational stability. This results in a smoother and more accurate signal after gain adjustment, providing a higher-quality signal foundation for subsequent low-pass filtering and analog-to-digital conversion.

[0033] In one possible implementation, the photoelectric detection circuit further includes a low-pass filter circuit, which is connected between the other end of the gain adjustment module and the analog-to-digital conversion port of the external control chip.

[0034] Furthermore, the low-pass filter circuit includes: a sixth resistor R6 and a third capacitor C3; one end of the sixth resistor R6 is connected to the output terminal of the operational amplifier U1, and the other end of the sixth resistor R6 is connected to the analog-to-digital conversion port of the external control chip; one end of the third capacitor C3 is connected to the other end of the sixth resistor R6, and the other end of the third capacitor C3 is grounded.

[0035] Specifically, the sixth resistor R6 and the third capacitor C3 constitute a classic RC low-pass filter structure. By properly matching their parameters, the filter cutoff frequency can be precisely set, allowing only useful signals (corresponding to the effective electrical signal of optical power) below the cutoff frequency to pass through, effectively filtering out high-frequency interference and noise. Simultaneously, the sixth resistor R6 also serves as a current limiter and impedance matcher, limiting the instantaneous current flowing into the analog-to-digital converter port, preventing voltage spikes from damaging the external control chip's analog-to-digital converter module, and reducing the impedance difference between the gain adjustment module's output and the analog-to-digital converter port, thus reducing signal distortion during transmission. This RC low-pass filter circuit has a simple structure and high reliability. While achieving efficient filtering, it also provides protection and impedance matching functions, further enhancing the practicality and stability of the entire photoelectric detection circuit.

[0036] In one possible implementation, the power supply voltage is a 5V DC voltage.

[0037] Specifically, a 5V DC voltage provides a stable operating power supply for operational amplifier U1, which not only meets the operating voltage requirements of the operational amplifier and ensures its linear amplification performance, but also avoids problems such as excessive power consumption and severe overheating caused by excessively high supply voltage. Simultaneously, the external control chip can also be powered by a 5V DC voltage. In this application, this power supply can also be used to power both the external control chip and operational amplifier U1 separately, and a ferrite bead can be connected between the two power supply ports to filter high-frequency interference on the power line. Furthermore, the power supply can be filtered through a grounding capacitor.

[0038] Secondly, this application provides an electronic device including a temperature-compensated photoelectric detection circuit as described in any one of the embodiments.

[0039] Specifically, by integrating this temperature-compensated photoelectric detection circuit, electronic devices can possess high-precision, temperature-resistant photoelectric power detection capabilities, effectively solving the problem of decreased measurement accuracy in traditional photoelectric detection schemes under temperature variations or long-term operating conditions. The circuit's compact design facilitates internal integration into electronic devices, its wide temperature adaptability range allows it to meet the needs of electronic devices operating in different environments, and its high-precision detection performance improves the overall functional reliability and measurement accuracy of the electronic device. It is suitable for various electronic devices requiring photoelectric detection functions, such as optical power meters, photoelectric sensors, and optical inspection equipment, significantly enhancing the market competitiveness and application adaptability of these devices.

[0040] It should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0041] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the present utility model's technical solution shall still fall within the scope of the present utility model's technical solution.

Claims

1. A photoelectric detection circuit with temperature compensation, characterized in that, The photoelectric detection circuit includes: The system includes a photoelectric conversion module, a compensation voltage divider module, and a gain adjustment module. One end of the compensation voltage divider module is connected to one end of the photoelectric conversion module and one end of the gain adjustment module, respectively. The other ends of the photoelectric conversion module and the compensation voltage divider module are both grounded. The other end of the gain adjustment module is connected to the analog-to-digital conversion port of an external control chip. The compensation voltage divider module includes: Thermistor R2, one end of which is one end of the compensation voltage divider module; The third resistor R3 has one end connected to the other end of the thermistor R2, and the other end of the third resistor R3 is grounded. The gain adjustment module includes: power supply; Operational amplifier U1, the non-inverting input terminal of operational amplifier U1 is one end of the gain adjustment module, the positive power supply terminal of operational amplifier U1 is connected to the power supply, the negative power supply terminal of operational amplifier U1 is grounded, and the output terminal of operational amplifier U1 is the other end of the gain adjustment module; The fourth resistor R4 has one end connected to the inverting input terminal of the operational amplifier U1, and the other end grounded. The fifth resistor R5, one end of which is connected to the inverting input terminal of the operational amplifier U1; Potentiometer W1, the first fixed terminal of the potentiometer W1 is connected to the other end of the fifth resistor R5, the sliding terminal of the potentiometer W1 is connected to the second fixed terminal, and the second fixed terminal of the potentiometer W1 is connected to the output terminal of the operational amplifier U1.

2. The photoelectric detection circuit with temperature compensation as described in claim 1, characterized in that, The photoelectric conversion module includes: Photodiode LED1, wherein the anode of photodiode LED1 is grounded; A first resistor R1 is connected at one end to the anode of the photodiode LED1, and at the other end to one end of the compensation voltage divider module and one end of the gain adjustment module.

3. The photoelectric detection circuit with temperature compensation as described in claim 2, characterized in that, The gain adjustment module further includes: The first capacitor C1 has one end connected to the non-inverting input terminal of the operational amplifier U1, and the other end grounded. The second capacitor C2 is connected between the inverting input and output terminals of the operational amplifier U1.

4. The photoelectric detection circuit with temperature compensation as described in claim 3, characterized in that, The photoelectric detection circuit also includes: A low-pass filter circuit is connected between the other end of the gain adjustment module and the analog-to-digital conversion port of the external control chip.

5. The photoelectric detection circuit with temperature compensation as described in claim 4, characterized in that, The low-pass filter circuit includes: The sixth resistor R6 has one end connected to the output terminal of the operational amplifier U1, and the other end connected to the analog-to-digital conversion port of an external control chip. The third capacitor C3 has one end connected to the other end of the sixth resistor R6, and the other end of the third capacitor C3 is grounded.

6. The photoelectric detection circuit with temperature compensation as described in claim 5, characterized in that, The power supply operates at a DC voltage of 5V.

7. An electronic device, characterized in that, Includes a temperature-compensated photoelectric detection circuit as described in any one of claims 1-6.

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