A high-stability bond phase signal conversion circuit

Abstract

This invention belongs to the field of key phase signal processing technology, specifically relating to a high-stability key phase signal conversion circuit. The circuit includes a signal conditioning and filtering unit, a threshold setting unit, a threshold comparison unit, and an output interface. The signal conditioning and filtering unit is equipped with an operational amplifier AU1 for adjusting amplitude, suppressing noise, and removing glitches, along with a resistor-capacitor filter circuit. The operational amplifier AU1 is connected to the resistor-capacitor filter circuit and to the threshold setting unit. The threshold setting unit is connected to the threshold comparison unit. The threshold comparison unit is connected to the output interface and to both the resistor-capacitor filter circuit and the operational amplifier AU1. This invention achieves the technical effects of amplitude adjustment, noise suppression, and glitches removal for key phase signals.

Description

Technical Field

[0001] This invention belongs to the field of bond phase signal processing technology, and specifically relates to a highly stable bond phase signal conversion circuit. Background Technology

[0002] In fields such as industrial automation and rotating machinery monitoring, key phase signals, as core parameters reflecting the operating status of equipment, are the key basis for realizing speed measurement, phase analysis, vibration monitoring, and fault diagnosis. The quality of these signals directly determines the accuracy of data acquisition and the reliability of operation control in industrial systems. For example, in monitoring systems for rotating machinery such as steam turbines, fans, and pumps, key phase signals need to be precisely synchronized with shaft angle information to provide basic data support for equipment load adjustment and anomaly early warning. Therefore, the stability and anti-interference capabilities of the signals are of extremely high importance.

[0003] However, in actual industrial scenarios, the raw bond phase signals acquired by sensors are highly susceptible to complex environmental factors and hardware characteristics, and generally suffer from three major problems: First, glitches and interference, such as electromagnetic radiation and motor start-stop shocks in industrial environments, can superimpose high-frequency noise glitches into the signal; second, signal jitter, where mechanical vibrations cause fluctuations in the relative position of the sensor and the measured component, leading to signal jumps; and third, unstable amplitude, where sensor aging, power supply voltage fluctuations, or changes in transmission distance can cause the signal amplitude to fluctuate and deviate from the standard range.

[0004] Existing key phase signal processing solutions are inadequate to effectively address the aforementioned problems: some solutions employ only simple RC filter circuits, which can filter out some low-frequency noise, but have limited effectiveness in suppressing high-frequency glitches and are prone to signal edge distortion; another type of solution relies on fixed threshold judgment circuits, which are prone to missing valid signals (amplitude below the threshold) or false triggering (noise above the threshold) when the signal amplitude fluctuates; these defects directly lead to erroneous data output by the monitoring system, such as deviations in speed calculation and misjudgment of vibration phase, and in severe cases, even cause equipment control logic disorder, increasing downtime maintenance costs and safety risks.

[0005] Therefore, in response to the pain points of glitches, jitter, and amplitude instability in the key phase signals acquired by sensors, there is an urgent need for an efficient processing solution that can achieve precise signal conditioning, adaptive threshold judgment, and standardized output, so as to improve signal stability and anti-interference capability and ensure the reliable operation of industrial monitoring and control systems.

[0006] For example, a Chinese patent, publication number CN113884286A, publication date January 4, 2022, entitled "A Circuit for Processing Key Phase Signals in Vibration Analysis of Rotating Machinery," discloses a circuit for processing key phase signals in vibration analysis of rotating machinery. This circuit includes an average level detection circuit, a filtering and amplification circuit, a hysteresis comparator, and a shaping circuit. The input key phase signal is divided into two paths: one path directly enters the hysteresis comparator, and the other path passes through the average level detection circuit to detect the average level. After passing through the filtering and amplification circuit, the average level is detected and then enters the hysteresis comparator. After comparison, the hysteresis comparator outputs a bipolar pulse signal, which is then shaped by the shaping circuit to obtain a unipolar pulse signal. The obtained signal facilitates the analysis of the equipment's operating status.

[0007] Although the aforementioned patent can be applied to key phase signals of different polarities and with different DC offsets, and can be well converted into the final unipolar pulse signal even if the input signal amplitude is too small, the aforementioned patent only uses a simple filtering and amplification circuit, and cannot adjust the amplitude of the key phase signal, suppress noise, or remove glitches and interference. Summary of the Invention

[0008] To address the problems of the prior art, the present invention provides a highly stable key phase signal conversion circuit capable of adjusting the amplitude of the key phase signal, suppressing noise, and removing glitches.

[0009] To achieve the aforementioned technical effects, the specific technical solution of this application is as follows: A high-stability key-phase signal conversion circuit includes a signal conditioning and filtering unit, a threshold setting unit, a threshold comparison unit, and an output interface. The signal conditioning and filtering unit is equipped with an operational amplifier AU1 for adjusting amplitude, suppressing noise, and removing glitches, as well as a resistor-capacitor filter circuit. The operational amplifier AU1 is connected to the resistor-capacitor filter circuit and is also connected to the threshold setting unit. The threshold setting unit is connected to the threshold comparison unit. The threshold comparison unit is connected to the output interface and is also connected to the resistor-capacitor filter circuit and the operational amplifier AU1.

[0010] Furthermore, the threshold setting unit includes a threshold setter AU2; the resistor-capacitor filter circuit includes capacitors C1, C2, and C3; one end of capacitor C1 is connected to the non-inverting input of operational amplifier AU1; one end of capacitor C2 is connected to pin -VD of operational amplifier AU1; one end of capacitor C3 is connected to pin VDC of operational amplifier AU1; the other ends of capacitors C1, C2, and C3 are all grounded; capacitors C1 and C2 are connected, and capacitor C1 is connected to the threshold setter AU2, so that capacitors C1 and C2 filter out high-frequency ripple on the power line.

[0011] Furthermore, the resistor-capacitor filter circuit is also equipped with resistors R1 and R2 to ensure signal amplitude stability; resistor R2 is connected in parallel with operational amplifier AU1, and one end of resistor R2 is connected in series with one end of resistor R1; resistor R1 is connected to the inverting input terminal of operational amplifier AU1, and resistor R1 is connected in series with capacitor C3 through operational amplifier AU1, thereby filtering out glitches and interference in the original signal; the other end of resistor R1 is used to input non-standard key pulses.

[0012] Furthermore, the VDC pin of the operational amplifier AU1 is connected to a 19.2V positive DC power supply.

[0013] Furthermore, the operational amplifier AU1 has its pin -VD connected to a -24V negative DC power supply.

[0014] Furthermore, the REF pin of the threshold setter AU2 is connected to the operational amplifier AU1.

[0015] Furthermore, the threshold setter AU2 has pins REFLO, GND, A, and GND. All grounded, pins Connect one end of resistor R3, and connect the other end of resistor R3 to a 5V positive DC power supply. Connect pin VCC to one end of capacitor C4, and connect the other end of capacitor C4 to ground. Connect pin VCC to capacitor C4 and connect pin VCC to a 5V positive DC power supply.

[0016] Furthermore, the threshold setting unit also includes a threshold switcher AU3; the threshold comparison unit includes a threshold comparator AU4; the threshold setter AU2 and the threshold comparator AU4 are connected by the threshold switcher AU3; the inverting input terminal of the threshold comparator AU4 is connected to the operational amplifier AU1 and the resistor R2.

[0017] Furthermore, the VOUTA pin of the threshold setter AU2, used to set the threshold value, is connected to the S2 pin of the threshold switcher AU3, and the VOUTB pin of the threshold setter AU2, used to set the threshold value, is connected to the S1 pin of the threshold switcher AU3; the non-inverting input of the threshold comparator AU4 is connected to the resistor R4; the resistor R4 is connected to the D pin of the threshold switcher AU3, and the D pin is connected to either the S2 pin or the S1 pin.

[0018] Furthermore, the GND pin of the threshold switcher AU3 is connected to one end of the capacitor C5, and this connection is grounded; the other end of the capacitor C5 is connected to the VDD pin of the threshold switcher AU3, and this connection is connected to a 5V positive DC power supply; the IN pin of the threshold switcher AU3 is connected to one end of the pull-up resistor R5, and the IN pin is connected to the output interface; the threshold comparator AU4 is connected to the output interface, which is used to output a standard key phase pulse; the other end of the pull-up resistor R5 is connected to a 3.3V positive DC power supply.

[0019] Based on the above technical solution, the beneficial effects of the present invention are as follows: 1. In this invention, the signal conditioning and filtering unit provides a 19V positive power supply and a 24V negative power supply to linearly amplify or attenuate the filtered signal, thereby adapting it to the input range of the subsequent threshold comparator. At the same time, the bipolar power supply covers both positive and negative signals to avoid signal clipping distortion.

[0020] 2. In this invention, the signal conditioning and filtering unit uses capacitor C3 and resistor R1 to form a low-pass filter, which filters out glitches and interference in the original signal, thereby outputting a smooth initial signal.

[0021] 3. In this invention, the signal conditioning and filtering unit uses an operational amplifier AU1, resistor R1 and resistor R2 to ensure that the conditioned signal maintains a linear relationship with the original bond phase signal, providing an accurate signal input for subsequent threshold comparison.

[0022] 4. In this invention, the signal conditioning and filtering unit uses capacitors C1 and C2 to filter out high-frequency ripples on the power line, thereby avoiding power supply noise interference with the signal processing accuracy of the operational amplifier AU1.

[0023] 5. The present invention uses a threshold setter AU2 to dynamically adjust the thresholds of VOUTA / VOUTB, thereby enabling adaptation to key phase signals of different amplitudes without modifying the hardware circuit, thus reducing equipment adaptation costs.

[0024] 6. This invention utilizes a dual-power supply design for the operational amplifier AU1, enabling the circuit to process non-standard key phase signals containing both positive and negative voltage components. This solves the problem of negative signal clipping distortion in traditional single-power supply circuits and adapts to the output characteristics of various sensors in industrial scenarios.

[0025] 7. By employing a threshold switcher AU3, a threshold comparator AU4, and a gating feedback design, the circuit of this invention can automatically switch the threshold according to the polarity or amplitude of the current key phase signal, thus avoiding signal missed detection or false detection caused by manually preset thresholds. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall circuit connection of the present invention.

[0027] Figure 2 This is a schematic diagram of the principle of the present invention.

[0028] Figure 3 This is a circuit connection diagram of the signal conditioning and filtering unit.

[0029] Figure 4 A schematic diagram of the circuit connection for the threshold setting unit.

[0030] Figure 5 This is a schematic diagram of the circuit connection between the threshold comparison unit and the output interface. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0032] Example 1 A high-stability key phase signal conversion circuit includes a signal conditioning and filtering unit, a threshold setting unit, a threshold comparison unit, and an output interface. The signal conditioning and filtering unit is equipped with an operational amplifier AU1 for adjusting amplitude, suppressing noise, and removing glitches, along with a resistor-capacitor filter circuit. The signal conditioning and filtering unit receives the raw key phase signal output from the sensor and performs preliminary conditioning and filtering. Since the sensor output signal may exhibit amplitude fluctuations, glitches, or low signal-to-noise ratio issues in practical applications, the signal conditioning and filtering unit optimizes signal quality through amplification, filtering, and limiting. After processing by the signal conditioning and filtering unit, the signal amplitude is adjusted to a range suitable for subsequent processing, and noise interference is effectively suppressed. The operational amplifier is connected to the resistor-capacitor filter circuit, and the operational amplifier AU1 is connected to the threshold setting unit. The threshold setting unit is used to set the effective trigger threshold of the signal to ensure that only key phase signals whose amplitude meets the set conditions are considered valid. Effective signal; it can adopt a fixed threshold setting method, with the threshold manually adjusted according to the application scenario, or an adaptive threshold setting method, which automatically adjusts the threshold value according to the characteristics of the input signal; the threshold setting unit is composed of digital control circuit, which can flexibly adjust the threshold to adapt to the signal characteristics of different sensors and different environmental conditions; the threshold setting unit is connected to the threshold comparison unit; the threshold comparison unit is connected to the output interface, and the threshold comparison unit is also connected to the resistor-capacitor filter circuit and the operational amplifier AU1; the threshold comparison unit determines whether the signal has reached the trigger condition by comparing the amplitude of the input signal with the set threshold, and outputs the corresponding high and low level signals; the signal output by this unit is a clear high and low level signal, which is convenient for interfacing with subsequent digital circuits or control systems; the output interface is used to provide standardized signal output to adapt to different industrial control and monitoring systems; the output can adopt TTL, CMOS, and relay drive methods to adapt to different types of subsequent equipment.

[0033] like Figure 2 As shown, a non-standard pulse input (i.e., a non-standard key phase pulse) is processed by a signal conditioning and filtering unit, and then input to a comparator in a threshold comparison unit to compare it with the threshold setting unit. This results in a standard pulse being output from the output interface, and the pulse is then gated and fed back to the threshold gating unit to achieve threshold switching.

[0034] Example 2 Based on Embodiment 1, the threshold setting unit includes a threshold setter AU2; as... Figure 1 and Figure 3As shown, the resistor-capacitor filter circuit includes capacitors C1, C2, and C3. One end of capacitor C1 is connected to the non-inverting input terminal of operational amplifier AU1 (pin 2 of operational amplifier AU1); one end of capacitor C2 is connected to pin -VD of operational amplifier AU1 (pin 4 of operational amplifier AU1); pin -VD of operational amplifier AU1 is connected to a -24V negative DC power supply; one end of capacitor C3 is connected to pin VDC of operational amplifier AU1 (pin 8 of operational amplifier AU1); pin VDC of operational amplifier AU1 is connected to a 19.2V positive DC power supply; with the support of dual power supplies, operational amplifier AU1... The filtered signal is linearly amplified or attenuated to match the input range of the subsequent threshold comparator; simultaneously, bipolar power supply covers both positive and negative signals to avoid signal clipping distortion; the other ends of capacitors C1, C2, and C3 are all grounded; capacitors C1 and C2 are connected, and capacitor C1 is also connected to the threshold setter AU2, so that capacitors C1 and C2 filter out high-frequency ripple on the power line, preventing power supply noise from interfering with the signal processing strength of operational amplifier AU1; operational amplifier AU1 can be an LT1638I, and threshold setter AU2 can be an LTC6702HTS8; the capacitance of capacitors C1, C2, and C3 is 100nF.

[0035] The resistor-capacitor filter circuit also includes resistors R1 and R2 to ensure signal amplitude stability; resistor R2 is 1.5 kΩ and resistor R1 is 17.4 kΩ; resistors R1 and R2 are attenuated according to the input limit of the threshold setter AU2 of the preceding signal range, and the attenuation ratio is resistor R2 / resistor R1. In this embodiment, resistor R2 / resistor R1 = 0.086; resistor R2 is connected in parallel with operational amplifier AU1, and one end of resistor R2 is connected in series with one end of resistor R1; resistor R1 is connected to the inverting input terminal of operational amplifier AU1 (pin 3 of the operational amplifier), and resistor R1 is connected in series with capacitor C3 through operational amplifier AU1 to form an RC low-pass filter, thereby filtering out glitches and interference in the original signal and outputting a smooth initial signal; the other end of resistor R1 is used to input non-standard key pulses; such as Figure 3 As shown, the signal conditioning and filtering unit, based on the deep negative feedback characteristics of the ideal operational amplifier, obtains the following specific formula for calculating the non-standard key phase signal after signal conditioning: ( ); In the formula, V REF This is the input reference voltage for pin 3 of operational amplifier AU1; This refers to the non-standard key-phase pulse signal voltage at pin 2 of operational amplifier AU1; This refers to a non-standard key phase signal after signal conditioning, which is input to the comparator in the threshold comparison unit. IN- The threshold output value of the port is compared with that of the threshold setting unit; resistors R1 and R2 are both attenuation ratio resistors.

[0036] Example 3 Based on Example 2, such as Figure 1 and Figure 4 As shown, pin REF (pin 10 of threshold setter AU2) is connected to operational amplifier AU1; pins REFLO (pin 13 of threshold setter AU2), GND (pin 14 of threshold setter AU2), A, and B are also connected to threshold setter AU2. (Pin 3 of the threshold setter AU2) is grounded. One end of resistor R3 (56 kΩ) is connected to the ground. The other end of resistor R3 is connected to a 5V positive DC power supply. Pin VCC (pin 16 of threshold setter AU2) is connected to one end of capacitor C4, and the other end of capacitor C4 is grounded. The connection point between pin VCC and capacitor C4 is connected to a 5V positive DC power supply. The capacitance of capacitor C4 is 100nF. Receives a trigger signal and loads the converted threshold from the internal register to the output; pin A reset is triggered in the event of an electrical fault in the circuit, causing pins VOUTA (pin 1 of threshold setter AU2) and VOUTB (pin 2 of threshold setter AU2) to output default safety values ​​to prevent sudden threshold changes; Figure 4 As shown, pin SDI is the serial data input terminal, receiving digital signals from the external controller, where the digital signals include the specific voltage values ​​of VOUTA / VOUTB; pin SCK is the serial clock input terminal, providing the synchronous clock signal "SCLK" for data transmission on pin SDI; pin middle" "This is the chip select signal for the threshold setter AU2, ensuring that the threshold configuration commands from the external controller can be accurately received by the threshold setter AU2; the SDI and pins of the threshold setter AU2..." Both pin SCK and MCU are connected to an external controller. This part follows a standard protocol, and conventional MCUs in the current technology can control these pins, so it will not be described in detail here. The threshold setting unit also includes a threshold switch AU3; the threshold switch AU3 can be an LTC2634IUD-HZ12; the threshold comparison unit includes a threshold comparator AU4; the threshold comparator AU4 can be an ADG779BKSZ-REEL7; the threshold switch AU3 is connected between the threshold setting unit AU2 and the threshold comparator AU4; the inverting input terminal of the threshold comparator AU4 (pin 6 of the threshold comparator AU4) is connected to the operational amplifier AU1 and the resistor R2, such as... Figure 4 As shown, the IN+ terminal of threshold comparator AU4 is the threshold, and the output is a standard high or low level. This terminal of threshold comparator AU4 is a non-standard key phase signal after signal conditioning.

[0037] In threshold setter AU2, pin VOUTA, used to set the threshold value, is connected to pin S2 (pin 6 of threshold switcher AU3). In threshold setter AU2, pin VOUTB, used to set the threshold value, is connected to pin S1 (pin 4 of threshold switcher AU3). The non-inverting input of threshold comparator AU4 (pin 5 of threshold comparator AU4) is connected to resistor R4. Resistor R4 has a strength of 49.9 ohms. Resistor R4 is connected to pin D (pin 5 of threshold switcher AU3), and pin D is connected to either pin S2 or pin S1. Pin D of threshold switcher AU3 is connected to pin IN.

[0038] Pin GND (pin 3 of threshold switch AU3) is connected to one end of capacitor C5, and this connection is grounded; the other end of capacitor C5 is connected to pin VDD (pin 2 of threshold switch AU3), and this connection is connected to a 5V positive DC power supply; the capacitance of capacitor C5 is 100nF; Figure 5 As shown, pin IN of threshold switcher AU3 is connected to one end of pull-up resistor R5, and pin IN (pin 1 of threshold switcher AU3) is connected to the output interface; threshold comparator AU4 is connected to the output interface (pin 7 of threshold comparator AU4), and the output interface is used to output standard key phase pulses; the other end of pull-up resistor R5 is connected to a 3.3V positive DC power supply; the pull-up resistor is 20 kΩ; pull-up resistor R5 provides pull-up for the output of threshold comparator AU4, stabilizing the high level at 3V; the standard key phase signal output from the output interface serves as the final output for external devices, and also feeds back to threshold switcher AU3 to drive threshold switching.

[0039] Example 4 Based on Embodiment 3, the working principle of this invention is as follows: A non-standard key phase signal is acquired and input to a signal conditioning and filtering unit. The signal conditioning and filtering unit filters out high-frequency electromagnetic interference mixed in the signal through capacitor C3 and resistor R1, and outputs a preliminarily smoothed original signal. Then, through operational amplifier AU1, the reference voltage VREF output from pin REF, resistors R1, R2, and R3, and a dual power supply, differential signal amplification and polarity conditioning are performed to eliminate common-mode noise, adapting the amplitude to the input range of the subsequent threshold comparator AU4, and maintaining a linear relationship between the polarity and the original signal. The threshold setter AU2 outputs two analog threshold voltages from pins VOUTA and VOUTB to the threshold switcher AU3; as... Figure 4 and Figure 5 As shown, the IN pin of threshold switcher AU3 receives the feedback control signal (PULSE) from the subsequent threshold comparator AU4. When PULSE is "low", the internal switch of threshold switcher AU3 switches to pin S1, and pin D outputs VOUTA (positive threshold). When PULSE is "high", the internal switch of threshold switcher AU3 switches to pin S2, and pin D outputs VOUTB (negative threshold). The switched threshold voltage is transmitted to the IN+ terminal of threshold comparator AU4 through the D terminal, and the above-conditioned signal is input to the IN- terminal of threshold comparator AU4. When the conditioned signal is greater than the threshold voltage, the output of threshold comparator AU4 is high; when the conditioned signal is less than the threshold voltage, the output of threshold comparator AU4 is low. The final level signal is output to an external device, completing the conversion from a non-standard pulse signal to a standard pulse signal.

[0040] The above description is a detailed description of the preferred embodiments of this application. However, the embodiments are not intended to limit the scope of the patent application of this application. All equivalent changes or modifications made under the technical spirit of this application should fall within the patent scope covered by this application.

Claims

1. A high-stability bond phase signal conversion circuit, characterized in that: It includes a signal conditioning and filtering unit, a threshold setting unit, a threshold comparison unit, and an output interface; the signal conditioning and filtering unit is equipped with an operational amplifier AU1 for adjusting amplitude, suppressing noise, and removing glitches and interference, and a resistor-capacitor filter circuit; the operational amplifier AU1 is connected to the resistor-capacitor filter circuit, and the operational amplifier AU1 is connected to the threshold setting unit; the threshold setting unit is connected to the threshold comparison unit; the threshold comparison unit is connected to the output interface, and the threshold comparison unit is connected to the resistor-capacitor filter circuit and the operational amplifier AU1.

2. The high-stability key phase signal conversion circuit according to claim 1, characterized in that: The threshold setting unit includes a threshold setter AU2; the resistor-capacitor filter circuit includes capacitors C1, C2, and C3; one end of capacitor C1 is connected to the non-inverting input of operational amplifier AU1; one end of capacitor C2 is connected to pin -VD of operational amplifier AU1; one end of capacitor C3 is connected to pin VDC of operational amplifier AU1; the other ends of capacitors C1, C2, and C3 are all grounded; capacitors C1 and C2 are connected, and capacitor C1 is connected to the threshold setter AU2, so that capacitors C1 and C2 filter out high-frequency ripple on the power line.

3. The high-stability bond phase signal conversion circuit according to claim 2, characterized in that: The resistor-capacitor filter circuit is further provided with resistors R1 and R2 to ensure signal amplitude stability; resistor R2 is connected in parallel with operational amplifier AU1, and resistor R2 is connected in series with one end of resistor R1; resistor R1 is connected to the inverting input terminal of operational amplifier AU1, and resistor R1 is connected in series with capacitor C3 through operational amplifier AU1, thereby filtering out glitches in the original signal; the other end of resistor R1 is used to input non-standard key pulses.

4. The high-stability bond phase signal conversion circuit according to claim 3, characterized in that: The operational amplifier AU1 has its VDC pin connected to a 19.2V positive DC power supply.

5. The high-stability bond phase signal conversion circuit according to claim 3, characterized in that: The operational amplifier AU1 has its pin -VD connected to a -24V negative DC power supply.

6. The high-stability bond phase signal conversion circuit according to claim 3, characterized in that: The REF pin of the threshold setter AU2 is connected to the operational amplifier AU1.

7. The high-stability bond phase signal conversion circuit according to claim 6, characterized in that: The threshold setter AU2 has the following pins: REFLO, GND, A, and GND. All grounded, pins Connect one end of resistor R3, and connect the other end of resistor R3 to a 5V positive DC power supply. Connect pin VCC to one end of capacitor C4, and connect the other end of capacitor C4 to ground. Connect pin VCC to capacitor C4 and connect pin VCC to a 5V positive DC power supply.

8. The high-stability bond phase signal conversion circuit according to claim 7, characterized in that: The threshold setting unit further includes a threshold switcher AU3; the threshold comparison unit includes a threshold comparator AU4; the threshold setter AU2 and the threshold comparator AU4 are connected by the threshold switcher AU3; the inverting input terminal of the threshold comparator AU4 is connected to the operational amplifier AU1 and the resistor R2.

9. A high-stability bond phase signal conversion circuit according to claim 8, characterized in that: The threshold setter AU2 has a pin VOUTA for setting the threshold value, which is connected to pin S2 of the threshold switcher AU3. The threshold setter AU2 has a pin VOUTB for setting the threshold value, which is connected to pin S1 of the threshold switcher AU3. The non-inverting input of the threshold comparator AU4 is connected to resistor R4. Resistor R4 is connected to pin D of the threshold switcher AU3, and pin D is connected to pin S2 or pin S1.

10. A high-stability bond phase signal conversion circuit according to claim 9, characterized in that: The threshold switch AU3 has its GND pin connected to one end of capacitor C5, and this connection is grounded; the other end of capacitor C5 is connected to the VDD pin of threshold switch AU3, and this connection is connected to a 5V positive DC power supply; the threshold switch AU3 has its IN pin connected to one end of pull-up resistor R5, and the IN pin is connected to the output interface; the threshold comparator AU4 is connected to the output interface, which is used to output a standard key phase pulse; the other end of pull-up resistor R5 is connected to a 3.3V positive DC power supply.

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