Gain-adjustable isolation type high-precision micro signal amplification circuit
A technology of amplifying circuits and tiny signals, applied in the direction of DC-coupled DC amplifiers, differential amplifiers, etc., can solve the problems of industrial control systems that cannot be applied on a large scale, unadjustable gain, complex circuits, etc., to enhance anti-interference ability and simple circuit. , high precision effect
Pending Publication Date: 2021-02-05
XIANYANG ZHONGBING ELECTROMECHANICAL EQUIP MFG
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Problems solved by technology
In the current micro-signal amplification circuit, its circuit is complicated, the cost is high, and the gain cannot be adjusted, so it cannot be applied to industrial control systems on a large scale.
Method used
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Embodiment 1
[0055] Such as figure 1 As shown, this embodiment provides an isolated high-precision micro-signal amplifier circuit with adjustable gain, including:
[0056] Isolated power supply circuit 10, primary amplifier circuit 20, zero point adjustment circuit 30, secondary adjustable amplifier circuit 40;
[0057] Isolated power supply circuit 10: used to provide ±12V isolated DC power supply to the entire circuit;
[0058] A first-stage amplification circuit 20: amplifies the output signal of the sensor at the first stage;
[0059] Zero point adjustment circuit 30: short-circuit the positive and negative poles of the output signal of the sensor, and adjust the sliding rheostat so that the signal output of the circuit is 0V;
[0060] Second-level adjustable amplifying circuit 40: pass the signal output by the first-level amplifying circuit 20 through the adjustable sliding rheostat, so that the amplified voltage signal output by the circuit meets the requirements of the main contro...
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The invention belongs to the technical field of sensor output signal amplification circuits, and particularly relates to a gain-adjustable isolation type high-precision tiny signal amplification circuit which comprises an isolation power supply circuit, a primary amplification circuit, a zero point adjusting circuit and a secondary adjustable amplification circuit. According to the invention, allcircuits are built by adopting analog components, so that the circuit has the advantages of relatively strong anti-interference capability, simple circuit, low cost, adjustable gain, high precision, low imbalance and the like. In industrial control, most sensors are used for outputting voltage signals at [mu]V or mV level, so that the circuit can amplify the voltage signals to a voltage range which can be received by a main controller. The circuit provided by the invention uses fewer devices, occupies smaller space of a circuit board, and is very suitable for acquisition and amplification of sensor output signals.
Description
technical field [0001] The invention belongs to the technical field of sensor output signal amplifying circuits, in particular to an isolated high-precision tiny signal amplifying circuit with adjustable gain. Background technique [0002] In the field of industrial control, the application of sensors has penetrated into various aspects such as industrial production, ocean detection, medical diagnosis, and bioengineering. Therefore, the acquisition and data processing of sensor output signals play a vital role in the entire control system. For commonly used ones such as pressure sensors, the output voltage is generally a μV or mV signal, and this voltage value needs to be amplified to the range that the main control system can receive. In the current tiny signal amplifying circuit, the circuit is complicated, the cost is high, and the gain cannot be adjusted, so it cannot be applied to industrial control systems on a large scale. Contents of the invention [0003] (1) Te...
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IPC IPC(8): H03F3/45
CPCH03F3/45
Inventor 赵浩莫新民纪平鑫李睿远李强宋鹏王晶吕启元韦祖拔冯博琳孙汐畅朱鑫
Owner XIANYANG ZHONGBING ELECTROMECHANICAL EQUIP MFG