An electronic equipment analog signal calibration circuit

Abstract

The invention discloses an electronic equipment analog signal calibration circuit, comprising a frequency acquisition circuit, a feedback constant current circuit and a push-pull output circuit. The frequency acquisition circuit acquires the signal frequency in an analog signal channel in a low-voltage electronic equipment control terminal. The feedback constant current circuit uses transistors Q1, transistors Q2 and voltage regulator D3 to form a constant current source circuit to stabilize the signal potential. At the same time, a variable resistor R8 and an operational amplifier AR3 are used to form a current-voltage conversion circuit to convert the current signal into a voltage signal and then input it into a push-pull output circuit. A thyristor VTL1 and a voltage regulator D4 are used to form an abnormal signal detection circuit to feed back the abnormal signal to the collector of the transistor Q2. Finally, the push-pull output circuit uses transistors Q3, transistors Q4 and a variable resistor R16 to form a push-pull circuit to reduce the signal conduction loss and then output it, so that the signal frequency can be converted into a compensation signal of the signal in the analog signal channel in the remote intelligent device control terminal.

Description

Technical Field

[0001] The present invention relates to the field of circuit technology, and in particular to an electronic equipment analog signal calibration circuit. Background Art

[0002] At present, with the continuous development of science and technology, there are more and more electronic devices, which greatly improves people's quality of life. Then, the most common feedback about low-voltage electronic equipment is that the analog signal received by the control terminal has a large error, that is, the signal in the analog signal channel of the factory's low-voltage electronic equipment control terminal is prone to attenuation during transmission, resulting in insufficient signal power, which seriously affects the use of low-voltage electronic equipment. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide an electronic device analog signal calibration circuit, which can detect the signal frequency in the analog signal channel in the low-voltage electronic device control terminal in real time, and convert the signal frequency into a compensation signal of the signal in the analog signal channel in the remote intelligent device control terminal.

[0004] The technical solution is: an electronic equipment analog signal calibration circuit, including a frequency acquisition circuit, a feedback constant current circuit and a push-pull output circuit. The frequency acquisition circuit acquires the signal frequency in the analog signal channel in the low-voltage electronic equipment control terminal. The analog signal channel is a channel for the low-voltage electronic equipment control terminal to receive the output signal of the signal acquisition module. The feedback constant current circuit uses transistor Q1, transistor Q2 and voltage regulator D3 to form a constant current source circuit to stabilize the signal potential. At the same time, a variable resistor R8 and an op amp AR3 are used to form a current-voltage conversion circuit to convert the current signal into a voltage signal and then input it into the push-pull output circuit. The thyristor VTL1 and the voltage regulator D4 are used to form an abnormal signal detection circuit to feed back the abnormal signal to the collector of the transistor Q2, and adjust the output signal potential of the op amp AR3. Finally, the push-pull output circuit uses transistor Q3, transistor Q4 and a variable resistor R16 to form a push-pull circuit to reduce the signal conduction loss and then output, that is, a compensation signal for the signal in the analog signal channel in the low-voltage electronic equipment control terminal.

[0005] The feedback constant current circuit comprises a transistor Q1, the emitter of the transistor Q1 is connected to one end of a resistor R4, the base of the transistor Q1 is connected to the negative electrode of a diode D2, the collector of the transistor Q2, and one end of a resistor R12, the positive electrode of the diode D2 is connected to one end of a resistor R3, the other end of the resistor R3 is connected to the other end of the resistor R4 and one end of a capacitor C2, the other end of the capacitor C2 is connected to the base of the transistor Q2, the collector of the transistor Q1, and the negative electrode of a voltage-stabilizing tube D3, the positive electrode of the voltage-stabilizing tube D3 is grounded, the emitter of the transistor Q2 is connected to one end of a resistor R5, the other end of the resistor R5 is connected to resistors R6, R7, R9, one end of a capacitor C5, and one end of a variable resistor R8, and an operational amplifier AR3 The non-inverting input terminal of the operational amplifier AR3 is connected to the other end of the resistor R6 and the resistor R7, the other end of the capacitor C5 is grounded, the other end of the variable resistor R8 is connected to the power supply +5V, the inverting input terminal of the operational amplifier AR3 is connected to the other end of the resistor R9 and one end of the resistor R10, the output terminal of the operational amplifier AR3 is connected to the other end of the resistor R10 and the positive electrode of the thyristor VTL1 and the negative electrode of the voltage regulator D4, the negative electrode of the thyristor VTL1 is connected to the other end of the resistor R13, the other end of the resistor R13 is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to the other end of the resistor R12, the control electrode of the thyristor VTL1 is connected to the positive electrode of the voltage regulator D4 and one end of the resistor R15 and the capacitor C4, and the other ends of the resistor R15 and the capacitor C4 are grounded.

[0006] Through the above technical scheme, the beneficial effects of the present invention are:

[0007] 1. Use transistor Q1, transistor Q2 and voltage regulator D3 to form a constant current source circuit to stabilize the signal potential, use voltage regulator D3 to stabilize the base signal of transistor Q2, and realize the function of stabilizing the emitter signal of transistor Q2. Since the frequency transformer J1 outputs a current signal, and the compensation signal needs to be a voltage signal, the variable resistor R8 and the operational amplifier AR3 are used to form a current-voltage conversion circuit to convert the current signal into a voltage signal and then input it into the push-pull output circuit. In order to further ensure the amplitude of the signal, the thyristor VTL1 and the voltage regulator D4 are used to form an abnormal signal detection circuit to feed back the abnormal signal to the collector of the transistor Q2, and the abnormal signal is judged by the conduction voltage of the thyristor VTL1, so as to adjust the output signal potential of the operational amplifier AR3 and realize automatic calibration of the signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a system module diagram of the present invention.

[0009] Figure 2 It is a circuit schematic diagram of the present invention. DETAILED DESCRIPTION

[0010] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figure 1To Attachment Figure 2 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0011] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0012] Embodiment 1, an electronic device analog signal calibration circuit, including a frequency acquisition circuit, a feedback constant current circuit and a push-pull output circuit, the frequency acquisition circuit acquires the signal frequency in the analog signal channel in the low-voltage electronic device control terminal, the analog signal channel is the channel for the low-voltage electronic device control terminal to receive the output signal of the signal acquisition module, the feedback constant current circuit uses transistor Q1, transistor Q2 and voltage regulator D3 to form a constant current source circuit to stabilize the signal potential, and at the same time uses variable resistor R8 and op amp AR3 to form a current-voltage conversion circuit to convert the current signal into a voltage signal and then input it into the push-pull output circuit, wherein the thyristor VTL1 and voltage regulator D4 are used to form an abnormal signal detection circuit to feed back the abnormal signal to the collector of the transistor Q2, adjust the output signal potential of the op amp AR3, and finally the push-pull output circuit uses transistor Q3, transistor Q4 and variable resistor R16 to form a push-pull circuit to reduce the signal conduction loss and then output, that is, a compensation signal for the signal in the analog signal channel in the low-voltage electronic device control terminal;

[0013] The feedback constant current circuit uses transistor Q1, transistor Q2 and voltage regulator D3 to form a constant current source circuit to stabilize the signal potential. The voltage regulator D3 is used to stabilize the base signal of the transistor Q2 to achieve the function of stabilizing the emitter signal of the transistor Q2. Since the frequency transformer J1 outputs a current signal, and the compensation signal needs to be a voltage signal, the variable resistor R8 and the operational amplifier AR3 are used to form a current-voltage conversion circuit to convert the current signal into a voltage signal and then input it into the push-pull output circuit. In order to further ensure the amplitude of the signal, the thyristor VTL1 and the voltage regulator D4 are used to form an abnormal signal detection circuit to feed back the abnormal signal to the collector of the transistor Q2, and the conduction voltage of the thyristor VTL1 is used to judge the abnormality. A normal signal is used to adjust the output signal potential of the operational amplifier AR3, thereby realizing automatic calibration of the signal. The emitter of the transistor Q1 is connected to one end of the resistor R4, the base of the transistor Q1 is connected to the cathode of the diode D2, the collector of the transistor Q2, and one end of the resistor R12, the anode of the diode D2 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the other end of the resistor R4 and one end of the capacitor C2, the other end of the capacitor C2 is connected to the base of the transistor Q2, the collector of the transistor Q1, and the cathode of the voltage-regulating tube D3, the anode of the voltage-regulating tube D3 is grounded, the emitter of the transistor Q2 is connected to one end of the resistor R5, and the other end of the resistor R5 is connected to the resistor R6, the resistor R7, the resistor R9, and the capacitor C5. One end of the resistor R6 and the resistor R7 are connected to ground, the other end of the capacitor C5 is grounded, the other end of the variable resistor R8 is connected to the power supply +5V, the inverting input terminal of the op amp AR3 is connected to the other end of the resistor R9 and one end of the resistor R10, the output terminal of the op amp AR3 is connected to the other end of the resistor R10 and the positive electrode of the thyristor VTL1 and the negative electrode of the voltage regulator D4, the negative electrode of the thyristor VTL1 is connected to the other end of the resistor R13, the other end of the resistor R13 is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to the other end of the resistor R12, the control electrode of the thyristor VTL1 is connected to the positive electrode of the voltage regulator D4 and one end of the resistor R15 and the capacitor C4, and the other ends of the resistor R15 and the capacitor C4 are grounded.

[0014] Embodiment 2, on the basis of embodiment 1, the push-pull output circuit uses transistor Q3, transistor Q4 and variable resistor R16 to form a push-pull circuit to reduce the signal conduction loss and then output, that is, it is a compensation signal for the signal in the analog signal channel in the low-voltage electronic equipment control terminal. The signal compensation method is adopted to prevent insufficient signal power and ensure the stability of signal transmission. The base of the transistor Q3 is connected to the base of the transistor Q4 and the output end of the operational amplifier AR3, the collector of the transistor Q3 is connected to the power supply +5V, the emitter of the transistor Q3 is connected to one end of the resistor R14 and the emitter of the transistor Q4, the collector of the transistor Q4 is connected to one end of the variable resistor R16, the other end of the variable resistor R16 is grounded, and the other end of the resistor R14 is connected to the signal output port.

[0015] Embodiment 3, on the basis of embodiment 1, the frequency acquisition circuit selects a frequency transformer J1 of model SJ-ADC to acquire the signal frequency in the analog signal channel in the low-voltage electronic equipment control terminal, the voltage regulator D1 is used for voltage stabilization, the power supply terminal of the frequency transformer J1 is connected to the capacitor C1, one end of the resistor R1 and the power supply +5V, the ground terminal of the frequency transformer J1 is grounded, the output terminal of the frequency transformer J1 is connected to the capacitor C1, the other end of the resistor R1 and one end of the resistor R2 and the negative electrode of the voltage regulator D1, the other end of the resistor R2 is connected to the other end of the resistor R3, and the positive electrode of the voltage regulator D1 is grounded.

[0016] When the present invention is used in a specific embodiment, an electronic device analog signal calibration circuit includes a frequency acquisition circuit, a feedback constant current circuit and a push-pull output circuit. The frequency acquisition circuit acquires the signal frequency in an analog signal channel in a low-voltage electronic device control terminal. The analog signal channel is a channel for the low-voltage electronic device control terminal to receive the output signal of a signal acquisition module. The feedback constant current circuit uses transistors Q1, Q2 and a voltage regulator D3 to form a constant current source circuit to stabilize the signal potential. The voltage regulator D3 is used to stabilize the base signal of the transistor Q2 to achieve the function of stabilizing the emitter signal of the transistor Q2. Since the frequency transformer J1 outputs a current signal, and the compensation signal needs to be a voltage signal, a variable resistor R is used. 8 and operational amplifier AR3 form a current-voltage conversion circuit to convert the current signal into a voltage signal and then input it into the push-pull output circuit. In order to further ensure the amplitude of the signal, the thyristor VTL1 and the voltage regulator D4 are used to form an abnormal signal detection circuit to feed back the abnormal signal to the collector of the transistor Q2. The abnormal signal is judged by the conduction voltage of the thyristor VTL1 to adjust the output signal potential of the operational amplifier AR3, thereby realizing automatic calibration of the signal. Finally, the push-pull output circuit uses the transistor Q3, the transistor Q4 and the variable resistor R16 to form a push-pull circuit to reduce the signal conduction loss and then output it, which is also a compensation signal for the signal in the analog signal channel in the control terminal of the low-voltage electronic equipment.

[0017] The above is a further detailed description of the present invention in combination with a specific implementation method, and it cannot be determined that the specific implementation of the present invention is limited to this; for technical personnel in the technical field to which the present invention belongs and related technical fields, based on the technical solution of the present invention, the expansion and replacement of operating methods and data should all fall within the protection scope of the present invention.

Claims

1. An electronic device analog signal calibration circuit, comprising a frequency acquisition circuit, a feedback constant current circuit and a push-pull output circuit, characterized in that: The frequency acquisition circuit acquires the signal frequency in the analog signal channel in the low-voltage electronic device control terminal. The analog signal channel is a channel for the low-voltage electronic device control terminal to receive the output signal of the signal acquisition module. The feedback constant current circuit uses transistor Q1, transistor Q2 and voltage regulator D3 to form a constant current source circuit to stabilize the signal potential. At the same time, a variable resistor R8 and an op amp AR3 are used to form a current-voltage conversion circuit to convert the current signal into a voltage signal and then input it into the push-pull output circuit. The thyristor VTL1 and the voltage regulator D4 are used to form an abnormal signal detection circuit to feed back the abnormal signal to the collector of the transistor Q2, adjust the output signal potential of the op amp AR3, and finally the push-pull output circuit uses transistor Q3, transistor Q4 and a variable resistor R16 to form a push-pull The circuit reduces the signal conduction loss and then outputs it, which is also a compensation signal for the signal in the analog signal channel in the low-voltage electronic equipment control terminal; the feedback constant current circuit includes a transistor Q1, the emitter of the transistor Q1 is connected to one end of the resistor R4, the base of the transistor Q1 is connected to the negative electrode of the diode D2 and the collector of the transistor Q2, and one end of the resistor R12, the positive electrode of the diode D2 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the other end of the resistor R4 and one end of the capacitor C2, the other end of the capacitor C2 is connected to the base of the transistor Q2, the collector of the transistor Q1 and the negative electrode of the voltage regulator D3, the positive electrode of the voltage regulator D3 is grounded, the emitter of the transistor Q2 is connected to one end of the resistor R5, and the other end of the resistor R5 is connected to the resistor R6, the resistor R7, the resistor R9, and the capacitor C5 One end of the resistor R6 and one end of the variable resistor R7 are connected to the same phase input end of the operational amplifier AR3, the other ends of the resistors R6 and R7 are grounded, the other end of the capacitor C5 is grounded, the other end of the variable resistor R8 is connected to the power supply +5V, the inverting input end of the operational amplifier AR3 is connected to the other end of the resistor R9 and one end of the resistor R10, the output end of the operational amplifier AR3 is connected to the other end of the resistor R10 and the positive electrode of the thyristor VTL1 and the negative electrode of the voltage regulator D4, the negative electrode of the thyristor VTL1 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to the other end of the resistor R12, the control electrode of the thyristor VTL1 is connected to the positive electrode of the voltage regulator D4 and one end of the resistor R15 and the capacitor C4, and the other ends of the resistor R15 and the capacitor C4 are grounded; The push-pull output circuit comprises a transistor Q3, the base of the transistor Q3 is connected to the base of the transistor Q4 and the output end of the operational amplifier AR3, the collector of the transistor Q3 is connected to the power supply +5V, the emitter of the transistor Q3 is connected to one end of the resistor R14 and the emitter of the transistor Q4, the collector of the transistor Q4 is connected to one end of the variable resistor R16, the other end of the variable resistor R16 is grounded, and the other end of the resistor R14 is connected to the signal output port; The frequency acquisition circuit is provided with a frequency transformer J1 of model SJ-ADC.

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