Integrated light emitting, detecting, and driving circuit

Abstract

The application relates to the technical field of optical detection, in particular to an integrated light-emitting detection driving circuit which comprises a main operational amplifier subcircuit, a constant-current output subcircuit, an LED chip subcircuit, an output power detection subcircuit and a feedback stabilization adjustment subcircuit; the constant-current output subcircuit is connected with the main operational amplifier subcircuit and the LED chip subcircuit respectively, the main operational amplifier subcircuit drives the LED chip subcircuit to emit light and generate a detection photoelectric current through the constant-current output subcircuit; the LED chip subcircuit is connected with the output power detection subcircuit, the detection photoelectric current generated by the LED chip subcircuit is converted into a voltage signal through the output power detection subcircuit; the feedback stabilization adjustment subcircuit is connected with the output power detection subcircuit and the main operational amplifier subcircuit respectively, the voltage signal generated by the output power detection subcircuit is fed back to the main operational amplifier subcircuit through the feedback stabilization adjustment subcircuit, and the integrated light-emitting detection driving circuit provided by the application has the effect of improving the robustness of a UVC LED.

Description

Technical Field

[0001] This application relates to the field of optical detection technology, and in particular to an integrated light-emitting detection driving circuit. Background Technology

[0002] Existing ultraviolet space charge management typically uses large-size deep ultraviolet light-emitting diodes and external photodetectors such as traditional photomultiplier tubes and silicon-based photodiodes to monitor UVC light intensity.

[0003] The luminous intensity of UVC LEDs may decrease over time due to aging effects during prolonged use, which may compromise the stability of the UVC LED light source. Furthermore, the addition of an external photodetector increases the size, power consumption, and cost of the entire circuit system, thereby reducing the robustness of the UVC LED. Summary of the Invention

[0004] To improve the robustness of UVC LEDs, this application provides an integrated light emission detection and driving circuit.

[0005] In a first aspect, this application provides an integrated light-emitting detection driving circuit, which adopts the following technical solution:

[0006] An integrated light-emitting detection and driving circuit includes a main operational amplifier sub-circuit, a constant current output sub-circuit, an LED chip sub-circuit, an output power detection sub-circuit, and a feedback stabilization and adjustment sub-circuit.

[0007] The constant current output sub-circuit is connected to the main operational amplifier sub-circuit and the LED chip sub-circuit respectively. The main operational amplifier sub-circuit controls the constant current output sub-circuit to drive the LED chip sub-circuit to emit light and generate a detection photocurrent.

[0008] The LED chip sub-circuit is connected to the output power detection sub-circuit, and the detection photocurrent generated by the LED chip sub-circuit is converted into a voltage signal by the output power detection sub-circuit.

[0009] The feedback stabilization adjustment sub-circuit is connected to the output power detection sub-circuit and the main operational amplifier sub-circuit respectively, and the voltage signal generated by the output power detection sub-circuit is fed back to the main operational amplifier sub-circuit through the feedback stabilization adjustment sub-circuit.

[0010] By adopting the above technical solution, the main operational amplifier sub-circuit controls the constant current output sub-circuit to drive the LED chip sub-circuit with a constant current. The detection device of the LED chip sub-circuit converts the detected photocurrent into a voltage signal through the output power detection sub-circuit. The voltage signal is fed back to the main operational amplifier sub-circuit through the feedback stabilization adjustment sub-circuit, thereby completing the light emission detection closed-loop feedback function and improving the robustness of UVC LED.

[0011] Optionally, the constant current output sub-circuit includes a sampling resistor R1 and a voltage stabilizing capacitor C2;

[0012] The sampling resistor R1 and the voltage regulator capacitor C2 are connected in series at the output terminal of the LED chip sub-circuit, and the voltage value of the sampling resistor R1 is fed to the positive terminal of the main operational amplifier sub-circuit.

[0013] By adopting the above technical solution, it is easy to drive the LED chip sub-circuit with constant current, so that the output light power of the LED chip sub-circuit is constant and the service life of the LED chip sub-circuit is extended.

[0014] Optionally, the LED chip sub-circuit includes a light-emitting LED and a detection LED;

[0015] The light-emitting LED is connected to the constant current output sub-circuit, and the constant current output sub-circuit controls the constant current to drive the light-emitting LED to emit light through the main operational amplifier sub-circuit.

[0016] The detection LED is connected to the light-emitting LED, and the detection LED detects the light-emitting LED and generates the detection photocurrent.

[0017] By adopting the above technical solution, it is convenient to detect the photocurrent of the light-emitting LED in the LED chip sub-circuit.

[0018] Optionally, the output power detection sub-circuit includes amplifier A1, resistor R2, and resistor R10;

[0019] The output terminal of the LED chip sub-circuit is connected to the negative input terminal of the amplifier A1. Resistors R2 and R10 are connected in parallel. One end of resistors R2 and R10 is connected to the output terminal of the LED chip sub-circuit, and the other end is connected to the output terminal of the amplifier A1.

[0020] By adopting the above technical solution, it is easy to convert the detection photocurrent into a corresponding voltage signal.

[0021] Optionally, the feedback stabilization sub-circuit includes resistors R3, R5, R6, R8, and amplifier A2;

[0022] Resistor R3 and resistor R6 are connected in series, resistor R5 and resistor R8 are connected in parallel, resistor R5 and resistor R8 are connected in parallel to the positive input terminal of amplifier A2, the negative input terminal of amplifier A2 is connected between resistor R3 and resistor R6, and resistor R3 is connected to the output terminal of amplifier A2.

[0023] By adopting the above technical solution, it is convenient to feed the voltage signal back to the main operational amplifier sub-circuit.

[0024] Optionally, a multi-channel selection switch is connected between the output terminal of the main operational amplifier sub-circuit and the LED chip sub-circuit.

[0025] By adopting the above technical solution, the connection and disconnection between the main operational amplifier sub-circuit and the LED chip sub-circuit can be better controlled.

[0026] Optionally, a cross-resistance selector switch is connected between the LED chip sub-circuit and the resistors R2 and R10. By adopting the above technical solution, it is convenient to control the on / off state between the LED chip sub-circuit and the resistors R2 and R10.

[0027] Optionally, a drive feedback function isolation terminal is connected between the output terminal of the amplifier A2 and the non-inverting input terminal of the main operational amplifier.

[0028] By adopting the above technical solution, it is convenient to feed back the corresponding voltage signal to the main operational amplifier sub-circuit.

[0029] In summary, this application includes the following beneficial technical effects: the main operational amplifier sub-circuit controls the constant current output sub-circuit to drive the LED chip sub-circuit with a constant current, the detection device of the LED chip sub-circuit converts the detected photocurrent into a voltage signal through the output power detection sub-circuit, and the voltage signal is fed back to the main operational amplifier sub-circuit through the feedback stabilization adjustment sub-circuit, thereby completing the light emission detection closed-loop feedback function and improving the robustness of UVC LED. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a sub-circuit of an integrated light-emitting detection driving circuit according to this application.

[0031] Figure 2 This is an overall circuit diagram of an integrated light-emitting detection driving circuit according to this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Main operational amplifier sub-circuit; 2. Constant current output sub-circuit; 3. LED chip sub-circuit; 4. Output power detection sub-circuit; 5. Feedback stabilization adjustment sub-circuit. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0035] This application discloses an integrated light-emitting detection driving circuit, referring to... Figure 1 It includes a main operational amplifier subcircuit, a constant current output subcircuit, an LED chip subcircuit, an output power detection subcircuit, and a feedback stabilization subcircuit. The constant current output subcircuit is connected to both the main operational amplifier subcircuit and the LED chip subcircuit. The main operational amplifier subcircuit controls the constant current output subcircuit to drive the LED chip subcircuit to emit light and generate a detection photocurrent. The LED chip subcircuit is connected to the output power detection subcircuit, and the detection photocurrent generated by the LED chip subcircuit is converted into a voltage signal by the output power detection subcircuit. The feedback stabilization subcircuit is connected to both the output power detection subcircuit and the main operational amplifier subcircuit. The voltage signal generated by the output power detection subcircuit is fed back to the main operational amplifier subcircuit through the feedback stabilization subcircuit.

[0036] In this embodiment, UVC LED is a sterilization technology. UV refers to ultraviolet light, which is classified in different ways according to its wavelength. UVC refers to the short-wavelength segment of ultraviolet light with a wavelength of 200-280nm, abbreviated as UVC ultraviolet light. UV light can destroy the DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) structure of microorganisms, causing bacteria to die or be unable to reproduce, thereby achieving sterilization. Among all ultraviolet light, UVC, this short-wave ultraviolet light, has the strongest sterilization effect and is therefore widely used in sterilization technology. LED is short for light-emitting diode, which emits light by releasing energy through the recombination of electrons and holes. UVC LED refers to the way UVC is emitted.

[0037] The main operational amplifier sub-circuit can be set to the LT1677 operational amplifier chip. The LT1677 operational amplifier chip controls the constant current output sub-circuit to drive the LED chip sub-circuit. The detection device of the LED chip sub-circuit converts the detected photocurrent into a voltage signal through the output power detection sub-circuit. The voltage signal is fed back to the main operational amplifier sub-circuit through the feedback stabilization adjustment sub-circuit, thereby completing the light emission detection closed-loop feedback function and improving the robustness of UVC LED.

[0038] In one embodiment of this example, such as Figure 2 As shown, the constant current output sub-circuit includes a sampling resistor R1 and a voltage regulator capacitor C2; the sampling resistor R1 and the voltage regulator capacitor C2 are connected in series at the output terminal of the LED chip sub-circuit, and the voltage value of the sampling resistor R1 is fed to the positive terminal of the main operational amplifier sub-circuit.

[0039] In practical applications, polarized capacitor C8 and surface-mount capacitor C7 are input voltage filtering capacitors. Polarized capacitor C8 is set to 10uF, and surface-mount capacitor C7 is set to 4.7uF. These capacitors are used to filter out interference and noise. The main operational amplifier sub-circuit can be configured as the main driver chip, which is the LT1677 low-noise precision operational amplifier. The positive input of the LT1677 is connected to the output voltage calculated by the detection feedback, and the negative input is connected to a 1kΩ resistor R1. The temperature drift of resistor R1 is less than 50ppm. The input voltage V at the positive input is controlled by... set It can control the drive current of the LED chip sub-circuit, and the expression for the output current is:

[0040]

[0041] The surface mount capacitor C3 is a 100nF filter capacitor used to filter out noise in the input voltage signal. The surface mount resistor R9 is a current limiting resistor with a resistance of 10Ω, and the surface mount resistor R4 is a pull-down resistor with a resistance of 100kΩ. This reduces the occurrence of damage to the device caused by excessive drive current generated by the input voltage during the turn-on phase.

[0042] In one embodiment of this example, such as Figure 2 As shown, the LED chip sub-circuit includes a light-emitting LED and a detection LED; the light-emitting LED is connected to the constant current output sub-circuit, which controls the constant current to drive the light-emitting LED to emit light through the main operational amplifier sub-circuit; the detection LED is connected to the light-emitting LED, and the detection LED detects the light-emitting LED and generates a detection photocurrent.

[0043] In practical applications, the light-emitting LEDs can be configured as four UVC Micro-LEDs connected in parallel for emission, and the detection LEDs can be configured as two UVC Micro-LEDs for detection. The peak emission wavelength range of the UVC Micro-LED chips is 250nm-280nm. Under constant current drive, the luminous intensity of the light-emitting UVC Micro-LED device is converted into photocurrent by an integrated UVC Micro-LED detection device. This facilitates the detection of the photocurrent of the light-emitting LEDs in the LED chip sub-circuit, and the photocurrent is sent to the output power detection sub-circuit for further control. This enables constant current drive of the LED chip sub-circuit, ensuring a constant output light power and extending the lifespan of the LED chip sub-circuit.

[0044] In the actual fabrication process, the UVC Micro-LED chip is bonded to the aluminum nitride ceramic substrate via surface mount bonding, which improves the heat dissipation performance of the device and increases its lifespan.

[0045] In one embodiment of this example, such as Figure 2 As shown, the output power detection sub-circuit includes amplifier A1, resistor R2, and resistor R10; the output terminal of the LED chip sub-circuit is connected to the negative input terminal of amplifier A1, resistors R2 and R10 are connected in parallel, one end of resistors R2 and R10 is connected to the output terminal of the LED chip sub-circuit, and the other end is connected to the output terminal of amplifier A1. A transresistance selector switch is connected between the LED chip sub-circuit and resistors R2 and R10.

[0046] In practical applications, amplifier A1 can be configured as an opto-transimpedance operational amplifier OPA380, resistor R2 is 100MΩ transimpedance, resistor R10 is 10MΩ transimpedance, and the UVC Micro-LED used for detection is connected to resistor R2, resistor R10 and the output terminal of opto-transimpedance operational amplifier OPA380 through a transimpedance selector switch. Opto-transimpedance operational amplifier OPA380 is powered by a voltage of ±2.5V. The UVC Micro-LED detection device is connected to a 2-pin terminal, which provides the negative bias voltage required by the UVC Micro-LED detection device through an external connection, thereby facilitating the conversion of the detection photocurrent into a corresponding voltage signal.

[0047] Resistors R10 and R2 amplify the photocurrent generated by the UVC Micro-LED detector into voltage signals of different factors through a transimpedance selection switch. Together with the 2-pin terminal that provides adjustable directional bias, they form a wide-range adjustable photoelectric transimpedance amplifier for the calculation and adjustment of feedback voltage.

[0048] In one embodiment of this example, such as Figure 2 As shown, the feedback stabilization sub-circuit includes resistors R3, R5, R6, and R8, and amplifier A2. Resistors R3 and R6 are connected in series, and resistors R5 and R8 are connected in parallel. Resistors R5 and R8 are connected in parallel to the non-inverting input terminal of amplifier A2. The negative-inverting input terminal of amplifier A2 is connected between resistors R3 and R6. Resistor R3 is connected to the output terminal of amplifier A2. A drive feedback function isolation terminal is connected between the output terminal of amplifier A2 and the non-inverting input terminal of the main operational amplifier.

[0049] In practical applications, resistors R6 and R3 have a resistance of 10kΩ, and resistors R5 and R8 are 10kΩ balancing resistors. Amplifier A2 is an operational amplifier (OPA354), and the drive feedback isolation terminal is a 2-pin terminal. The OPA354, along with resistors R6, R3, R5, and R8, forms a proportional amplification sub-circuit. The OPA354 is powered by ±2.5V, and the 2-pin terminal is connected to an external V... bias The output voltage V of the output power detection sub-circuit PD V is obtained by inputting it into a proportional circuit. set Its expression is:

[0050]

[0051] As UVC Micro-LED light-emitting devices age, the photoelectric effect generated by the detection device decreases, resulting in a smaller negative photovoltage of V. PD V, where the voltage is negative set With a smaller amplitude photovoltage V PD A larger voltage difference results in a larger input voltage V at the output. set The driving current also increases accordingly, thereby increasing the light power of the UVC Micro-LED light-emitting device, realizing feedback regulation of the light emission detection closed loop, which better ensures the constant output power, thus facilitating the feedback of the voltage signal to the main operational amplifier circuit.

[0052] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An integrated light emitting, detecting, and driving circuit, characterized by, The main operational amplifier sub-circuit, the constant current output sub-circuit, the LED chip sub-circuit, the output power detection sub-circuit and the feedback stable regulation sub-circuit are connected in series. The constant current output sub-circuit is connected with the main operational amplifier sub-circuit and the LED chip sub-circuit respectively, and the main operational amplifier sub-circuit controls the constant current output sub-circuit to drive the LED chip sub-circuit to emit light and generate a detection photocurrent. The LED chip sub-circuit is connected with the output power detection sub-circuit, and the detection photocurrent generated by the LED chip sub-circuit is converted into a voltage signal by the output power detection sub-circuit. The feedback stable regulation sub-circuit is connected with the output power detection sub-circuit and the main operational amplifier sub-circuit respectively, and the voltage signal generated by the output power detection sub-circuit is fed back to the main operational amplifier sub-circuit through the feedback stable regulation sub-circuit. The constant current output sub-circuit comprises a sampling resistor R1 and a voltage stabilizing capacitor C2. The sampling resistor R1 and the voltage stabilizing capacitor C2 are connected in series at the output end of the LED chip sub-circuit, and the voltage value of the sampling resistor R1 is fed to the positive end of the main operational amplifier sub-circuit. The output power detection sub-circuit comprises an amplifier A1, a resistor R2 and a resistor R10. The output end of the LED chip sub-circuit is connected with the negative input end of the amplifier A1, the resistor R2 and the resistor R10 are connected in parallel, one end of the resistor R2 and the resistor R10 is connected with the output end of the LED chip sub-circuit, and the other end is connected with the output end of the amplifier A1. The feedback stable regulation sub-circuit comprises a resistor R3, a resistor R5, a resistor R6, a resistor R8 and an amplifier A2. The resistor R3 and the resistor R6 are connected in series, the resistor R5 and the resistor R8 are connected in parallel, the resistor R5 and the resistor R8 are connected in parallel at the positive input end of the amplifier A2, the negative input end of the amplifier A2 is connected between the resistor R3 and the resistor R6, and the resistor R3 is connected with the output end of the amplifier A2.

2. The integrated light emitting, detecting, and driving circuit according to claim 1, wherein, The LED chip sub-circuit comprises a light-emitting LED and a detection LED. The light-emitting LED is connected with the constant current output sub-circuit, and the constant current output sub-circuit controls the constant current driving of the light-emitting LED through the main operational amplifier sub-circuit. The detection LED is connected with the light-emitting LED, and the detection LED detects the light-emitting LED and generates the detection photocurrent.

3. The integrated light emitting, detecting, and driving circuit of claim 1, wherein, The output end of the main operational amplifier sub-circuit and the LED chip sub-circuit are connected with a plurality of gate switches.

4. The integrated light emitting, detecting, and driving circuit of claim 1, wherein, The LED chip sub-circuit and the resistor R2 and the resistor R10 are connected with a transimpedance gate switch.

5. The integrated light emitting, detecting, and driving circuit of claim 1, wherein, The output end of the amplifier A2 and the main operational amplifier positive input end are connected with a driving feedback function isolation terminal.

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