High-temperature-resistant sinusoidal signal source filter circuit

Abstract

The utility model provides a high-temperature-resistant sinusoidal signal source filter circuit, which comprises a high-stability oscillation source module, the high-stability oscillation source module is composed of a crystal oscillator Y1 and other elements, the frequency stability of an oscillation source is ensured, the output frequency of a sinusoidal signal source can be changed by changing the frequency of the crystal oscillator, an inverter U1B shapes and outputs oscillation source signals, and the signal quality is further ensured. The power supply filtering module effectively eliminates circuit noise and interference, the high-stability voltage source module supplies power to the oscillation source circuit through a resistor R1, a voltage stabilizing diode D1 and a capacitor C5, the temperature stability of the oscillation source circuit is good due to the characteristics of the voltage stabilizing diode D1, and it is guaranteed that the circuit works stably under different conditions. The signal amplitude adjusting module can flexibly change the output amplitude of the sinusoidal signal source, the active band-pass filtering module can accurately convert square wave signals output by the oscillation source into sine wave signals, parameter setting is reasonable, and the characteristics of quality factor Q, gain G, center frequency F and the like enable the signal processing effect to be good. And parameters of the band-pass filter are matched with parameters of the oscillating source during debugging, so that the circuit is stable and reliable in overall performance, and is suitable for high-temperature environments and other scenes with high signal quality requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter circuit technical field especially relates to a high temperature resistant sine signal source filter circuit. BACKGROUND

[0002] In the current logging technical field, due to the high temperature of downhole, up to about 200 DEG C, even higher, in such high temperature environment work, the conventional signal source circuit is difficult to do justice to, or downhole high temperature direct failure burnout does not work, or work but the temperature drift and noise of signal can be particularly big, leading to logging failure or measurement data error. CONTENT

[0003] Therefore, the utility model wants to solve the technical problem of providing a high temperature resistant sine signal source filter circuit to improve the circuit stability.

[0004] To realize above-mentioned purpose, the utility model provides a high temperature resistant sine signal source filter circuit, it includes:

[0005] The power filter module is composed of capacitor C1 and capacitor C2, capacitor C1 and capacitor C2 are connected in parallel, one end of the power filter module is connected with the positive pole of power supply, and one end is connected with the ground of power supply.

[0006] The high-stability oscillation source module includes a crystal oscillator Y1, a resistor R2, a capacitor C3, a capacitor C4, an inverter U1A and an inverter U1B, the crystal oscillator Y1 is connected with the resistor R2 in parallel, two ends of the crystal oscillator Y1 are connected with one end of the capacitor C3 and the capacitor C4 respectively, and simultaneously connected with the 3th pin and the 4th pin of the inverter U1A, the other end of the capacitor C3 and the capacitor C4 is connected with the ground of power supply, the 4th pin of the inverter U1A is connected with the 1st pin of the inverter U1B, the 7th pin of the inverter U1B is connected with the ground of power supply, the 14th pin of the inverter U1B is connected with one end of the resistor R1, the voltage stabilizing diode D1 and the capacitor C5, the 2nd pin of the inverter U1B is the oscillation source output, the crystal oscillator Y1, the capacitor C3, the capacitor C4, the inverter U1A and the resistor R2 constitute a high-stability oscillation source, and the inverter U1B is used for oscillation source signal shaping output.

[0007] The high-stability voltage source module is composed of the resistor R1, the voltage stabilizing diode D1 and the capacitor C5, one end of the resistor R1 is connected with the positive pole VCC of power supply, the other end of the resistor R1 is connected with one end of the voltage stabilizing diode D1, the capacitor C5 and the 14th pin of the inverter U1B, the other end of the voltage stabilizing diode D1 and the capacitor C5 is connected with the ground of power supply, and the voltage stabilizing diode D1 is used for power supply for the oscillation source circuit.

[0008] Signal amplitude adjustment module, which includes resistance R3 and resistance R4, resistance R3 one end of inverter U1B 2 feet, the other end of the resistance R4 and resistance R5, the other end of the resistance R4 is connected to the ground and used to change the output amplitude of the sine signal source;

[0009] Active band-pass filter module, which is composed of operational amplifier U2A, operational amplifier U2B, resistance R5, resistance R6, resistance R7, capacitor C8 and capacitor C9, one end of resistance R5, resistance R6 and capacitor C8 is connected to the same phase input end 3 feet of operational amplifier U2A, the other end of capacitor C8 is connected to the ground, the other end of resistance R6 is connected to one end of capacitor C9 and the output end 7 feet of operational amplifier U2B, the other end of capacitor C9 is connected to one end of resistance R7 and the inverse input end 2 feet and 6 feet of operational amplifier U2A and operational amplifier U2B, the other end of resistance R7 is connected to the 1 feet of the operational amplifier U2A, the 5 feet of the operational amplifier U2B is connected to the 1 feet of the operational amplifier U2A and used as the final output of the sine signal source, the operational amplifier U2A and the operational amplifier U2B and resistance R5, resistance R6, resistance R7 and capacitor C8, capacitor C9 constitute an active band-pass filter with a gain of 1, which is used to change the square wave signal output by the oscillator source into a sine wave signal.

[0010] Further, the voltage stabilizing value of the voltage stabilizing diode D1 is 6.2V.

[0011] Further, resistance R6 and resistance R7 are equal resistance R, and capacitor C8 and capacitor C9 are equal capacitor.

[0012] Further, the amplitude of the sine signal output is determined by the proportion of resistance R3 and resistance R4.

[0013] Compared with the related art, the high-temperature-resistant sinusoidal signal source filtering circuit has the beneficial effects that: the high-stable oscillation source module is composed of the crystal oscillator Y1 and other elements, the oscillation source frequency is ensured to be stable, the oscillation source output frequency can be changed by changing the crystal oscillator frequency, the inverter U1B is used for shaping and outputting the oscillation source signal, the signal quality is further ensured, the power filtering module effectively eliminates the circuit noise and interference, the high-stable voltage source module supplies power for the oscillation source circuit through the resistor R1, the voltage stabilizing diode D1 and the capacitor C5, the voltage stabilizing diode D1 has good temperature stability, and the circuit is ensured to work stably under different conditions. The signal amplitude adjusting module can flexibly change the sinusoidal signal source output amplitude, the active band-pass filtering module can accurately convert the square wave signal output by the oscillation source into a sinusoidal wave signal, the parameters are reasonably set, the quality factor Q, the gain G and the center frequency F and other characteristics ensure excellent signal processing effect, and the band-pass filter parameters are matched with the oscillation source parameters during debugging, so that the overall performance of the circuit is stable and reliable, and the high-temperature environment and other scenes with high requirements on signal quality are applicable. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the high-temperature-resistant sinusoidal signal source filtering circuit in the utility model embodiment. DETAILED DESCRIPTION

[0015] The utility model will be further explained in detail in combination with the drawings and specific implementation.

[0016] Please see Figure 1 The utility model discloses a high-temperature-resistant sinusoidal signal source filtering circuit, which comprises a power filtering module: composed of a capacitor C1 and a capacitor C2, the capacitor C1 and the capacitor C2 are connected in parallel, one end is connected with the positive pole of the power supply, and the other end is connected with the ground of the power supply, which is used for eliminating the noise and interference of the circuit.

[0017] The high-stable oscillation source module comprises a crystal oscillator Y1, a resistor R2, a capacitor C3, a capacitor C4, an inverter U1A and an inverter U1B. The crystal oscillator Y1 is connected in parallel with the resistor R2, the two ends of the crystal oscillator Y1 are connected with one end of the capacitor C3 and the capacitor C4 respectively, and the capacitor C3 and the capacitor C4 are connected with the 3th pin and the 4th pin of the inverter U1A at the same time, the other end of the capacitor C3 and the capacitor C4 is connected with the ground of the power supply, the 4th pin of the inverter U1A is connected with the 1st pin of the inverter U1B, the 7th pin of the inverter U1B is connected with the ground of the power supply, the 14th pin of the inverter U1B is connected with one end of the resistor R1, the voltage stabilizing diode D1 and the capacitor C5, and the 2nd pin of the inverter U1B is the oscillation source output. The crystal oscillator Y1, the capacitor C3, the capacitor C4, the inverter U1A and the resistor R2 constitute a high-stable oscillation source, and the inverter U1B is used for shaping and outputting the oscillation source signal.

[0018] The high-stability voltage source module is composed of a resistor R1, a voltage stabilizing diode D1 and a capacitor C5. One end of the resistor R1 is connected to a positive electrode VCC of a power supply, the other end of the resistor R1 is connected to the voltage stabilizing diode D1, one end of the capacitor C5 and the 14th pin of the inverter U1B, and the other end of the voltage stabilizing diode D1 and the capacitor C5 is connected to a ground of the power supply. The voltage stabilizing diode D1 is used to supply power to an oscillation source circuit, wherein D1 is a 6.2V voltage stabilizing diode, which is between Zener breakdown and avalanche breakdown, and has the best temperature stability.

[0019] The signal amplitude adjustment module includes a resistor R3 and a resistor R4. One end of the resistor R3 is connected to the 2nd pin of the inverter U1B, and the other end of the resistor R3 is connected to the resistor R4 and the resistor R5. The other end of the resistor R4 is connected to the ground, and is used to change the output amplitude of the sinusoidal signal source.

[0020] The active band-pass filter module is composed of an operational amplifier U2A, an operational amplifier U2B, a resistor R5, a resistor R6, a resistor R7, a capacitor C8 and a capacitor C9. One end of the resistor R5, the resistor R6 and the capacitor C8 is connected to the non-inverting input end 3rd pin of the operational amplifier U2A, the other end of the capacitor C8 is connected to the ground, the other end of the resistor R6 is connected to one end of the capacitor C9 and the output end 7th pin of the operational amplifier U2B, the other end of the capacitor C9 is connected to one end of the resistor R7 and the inverting input end 2nd pin and the 6th pin of the operational amplifier U2A and the operational amplifier U2B, the other end of the resistor R7 is connected to the 1st pin of the operational amplifier U2A, and the 5th pin of the operational amplifier U2B is connected to the 1st pin of the operational amplifier U2A and serves as the final output of the sinusoidal signal source. The operational amplifier U2A, U2B, the resistor R5, the resistor R6, the resistor R7, the capacitor C8 and the capacitor C9 constitute an active band-pass filter with a gain of 1, which is used to convert the square wave signal output by the oscillation source into a sinusoidal wave signal. The band-pass filter takes R6 and R7 as equal-value resistors R, and C8 and C9 as equal-value capacitors C. The quality factor Q of the band-pass filter circuit is R5 / R6, the gain G is 1, and the center frequency F is 1 / 2πRC.

[0021] The high-stability oscillation source module is constructed by the crystal oscillator Y1, the resistor R2, the capacitors C3 and C4 and the inverter U1A. The crystal oscillator itself has extremely high frequency stability and can provide a stable basic oscillation frequency for the circuit. The feedback loop formed by the peripheral elements further reduces the frequency drift. The inverters U1A and U1B shape and buffer the signal, ensuring that the output oscillation signal has steep edges and regular waveforms, further improving the stability of the oscillation source, enabling the circuit to maintain frequency stability in complex environments such as high temperature and electromagnetic interference, and ensuring the accuracy of the signal source.

[0022] The high-stability voltage source module selects a 6.2V voltage stabilizing tube D1. Due to its special breakdown characteristics, it is between Zener breakdown and avalanche breakdown, and it is not sensitive to temperature changes, which greatly reduces the influence of temperature on voltage stability. Resistor R1 acts as a current limiter, and capacitor C5 performs filtering, together providing a stable and pure DC power supply for the oscillator circuit, ensuring stable power supply for the oscillator under different working conditions, and avoiding frequency instability or signal distortion caused by voltage fluctuations.

[0023] The active band-pass filter module is composed of operational amplifiers U2A, U2B, resistors R5-R7, and capacitors C8, C9. The carefully designed circuit structure can accurately convert the square wave signal output by the oscillator into a sine wave signal. This precise conversion relies on the coordinated work of each component. By reasonably setting the parameters of resistors and capacitors, the circuit can selectively amplify and attenuate different frequency components, thus achieving smooth conversion from square wave to sine wave, meeting the demand for output of specific waveforms.

[0024] The band-pass filter sets R6 and R7 as equal resistors R, and C8 and C9 as equal capacitors C. Through this parameter setting, the quality factor Q = R5 / R6, the gain G = 1, and the center frequency F = 1 / 2πRC are determined. This parameter combination optimizes the filtering effect, enabling the circuit to effectively filter out unwanted frequency components and only allow signals within a specific frequency range to pass through, improving the purity and stability of the output signal and reducing the interference of stray signals on the system.

[0025] The signal amplitude adjustment module can easily change the output amplitude of the sine signal source through proportional adjustment of resistors R3 and R4. This design makes the circuit adaptable to different subsequent circuit requirements. Whether it needs high-amplitude driving of the load or low-amplitude adaptation to specific input range circuits, it can be achieved through simple resistor adjustment, enhancing the versatility and flexibility of the circuit.

[0026] Single power supply and supply voltage range of 12V-15V enable the circuit to work stably under different power supply conditions. This feature is of great significance in practical applications. For example, in some scenarios where power supply is unstable or multiple power supply specifications coexist, the circuit can be used directly without additional power conversion circuit, reducing system cost and complexity and improving circuit adaptability and reliability.

[0027] During debugging, the band-pass filter and oscillator parameters require clear matching. The relationship between Q value, center frequency, and oscillator frequency is clear, and engineers can make targeted adjustments based on these clear parameter relationships to quickly optimize circuit performance, reducing the blindness and complexity of debugging and improving development efficiency.

[0028] The adjusting method of the sine signal output amplitude and frequency is simple and direct. The amplitude is adjusted by changing the ratio of R3 and R4, and the frequency is changed by adding a frequency divider at the pin 2 of the U1B output end. The intuitive adjusting mode enables the circuit to quickly adapt to different requirement changes in practical application, and facilitates on-site debugging and optimization.

[0029] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A high temperature resistant sinusoidal signal source filter circuit, characterized by, It includes: The power filter module is composed of capacitors C1 and C2, which are connected in parallel, one end of the power filter module is connected to the positive electrode of the power supply, and the other end is connected to the ground of the power supply; The high-stability oscillation source module includes a crystal oscillator Y1, a resistor R2, a capacitor C3, a capacitor C4, an inverter U1A, and an inverter U1B. The crystal oscillator Y1 is connected in parallel with the resistor R2. The two ends of the crystal oscillator Y1 are respectively connected to one end of the capacitor C3 and the capacitor C4, and are also connected to the 3-pin and 4-pin of the inverter U1A. The other end of the capacitor C3 and the capacitor C4 is connected to the ground of the power supply. The 4-pin of the inverter U1A is connected to the 1-pin of the inverter U1B. The 7-pin of the inverter U1B is connected to the ground of the power supply. The 14-pin of the inverter U1B is connected to one end of the resistor R1, the voltage stabilizing diode D1, and the capacitor C5. The 2-pin of the inverter U1B is the output of the oscillation source. The crystal oscillator Y1, the capacitor C3, the capacitor C4, the inverter U1A, and the resistor R2 constitute a high-stability oscillation source. The inverter U1B is used for shaping the output of the oscillation source. The high-stability voltage source module is composed of the resistor R1, the voltage stabilizing diode D1, and the capacitor C5. One end of the resistor R1 is connected to the positive electrode VCC of the power supply. The other end of the resistor R1 is connected to the voltage stabilizing diode D1, the capacitor C5, and the 14-pin of the inverter U1B. The other end of the voltage stabilizing diode D1 and the capacitor C5 is connected to the ground of the power supply. The voltage stabilizing diode D1 is used to power the oscillation source circuit. The signal amplitude adjustment module includes resistors R3 and R4. One end of the resistor R3 is connected to the 2-pin of the inverter U1B. The other end of the resistor R3 is connected to the resistor R4 and the resistor R5. The other end of the resistor R4 is connected to the ground and is used to change the output amplitude of the sinusoidal signal source. The active band-pass filter module is composed of operational amplifiers U2A and U2B, resistors R5, R6, and R7, and capacitors C8 and C9. One end of the resistors R5, R6, and C8 is connected to the 3-pin of the non-inverting input of the operational amplifier U2A. The other end of the capacitor C8 is connected to the ground. The other end of the resistor R6 is connected to one end of the capacitor C9 and the output 7-pin of the operational amplifier U2B. The other end of the capacitor C9 is connected to one end of the resistor R7 and the inverting input 2-pin and 6-pin of the operational amplifiers U2A and U2B. The other end of the resistor R7 is connected to the 1-pin of the operational amplifier U2A. The 5-pin of the operational amplifier U2B is connected to the 1-pin of the operational amplifier U2A and serves as the final output of the sinusoidal signal source. The operational amplifiers U2A and U2B, resistors R5, R6, and R7, and capacitors C8 and C9 constitute an active band-pass filter with a gain of 1, which is used to convert the square wave signal output by the oscillation source into a sinusoidal signal.

2. The high temperature-resistant sinusoidal signal source filter circuit of claim 1, wherein, The voltage stabilizing value of the voltage stabilizing diode D1 is 6.2V.

3. The high temperature-resistant sinusoidal signal source filter circuit of claim 2, wherein, The resistors R6 and R7 are equal-value resistors R, and the capacitors C8 and C9 are equal-value capacitors.

4. The high temperature-resistant sinusoidal signal source filter circuit of claim 3, wherein, The amplitude of the sinusoidal signal output is determined by the ratio of resistor R3 and resistor R4. The amplitude of the sinusoidal signal output is determined by the ratio of resistor R3 and resistor R4.

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