Intelligent sensor signal processing circuit

Abstract

The utility model relates to the technical field of signal processing, in particular to an intelligent sensor signal processing circuit, which comprises a signal differential amplification circuit and a signal inverting amplification circuit, the signal differential amplification circuit is composed of resistors R1, R2, R3, R4, R5, R6, R7, R9, R10, R11, R12, R13 and R14, capacitors C1, C2, C3, C5 and C6, a dual-channel operational amplifier U1A, and double diodes D1 and D2, and the signal inverting amplification circuit is composed of resistors R1, R2, R3, R4, R5, R6, R7, R9, R10, R11, R12, R13 and R14, capacitors C1, C2, C3, C5 and C6. The signal inverting amplification circuit is composed of a resistor R8, a resistor R15, a resistor R16, a capacitor C4, a dual-channel operational amplifier U1B and a protection diode T1, the two stages of amplification circuits are arranged, the front half part is the signal differential amplification circuit, the rear half part is the signal inverting amplification circuit, and through signal amplification processing of the front part and the rear part, a better amplification effect can be achieved; the signal amplification effect is more obvious; meanwhile, the input end voltage of the two-channel operational amplifier U1A can be clamped between-12V and + 12V through the double diodes D1 and D2 so as to protect the operational amplifier and prevent the operational amplifier from being burnt out due to overlarge voltage.

Description

TECHNICAL FIELD

[0001] The utility model relates to signal processing technical field especially for a kind of intelligent sensor signal processing circuit. BACKGROUND

[0002] General intelligent sensor needs to amplify signal after accepting signal, so as to be more conducive to the identification of signal, the signal processing circuit of the existing intelligent sensor is generally only realized by setting simple operational amplifier to amplify signal, the amplification effect of this signal amplification processing mode is not remarkable, and also cannot play the good protection effect of operational amplifier in the process of processing signal. INVENTION CONTENTS

[0003] The utility model discloses a kind of intelligent sensor signal processing circuit, including signal differential amplification circuit and signal inverting amplification circuit, signal differential amplification circuit is by resistance R1, R2, R3, R4, R5, R6, R7, R9, R10, R11, R12, R13, R14, capacitor C1, C2, C3, C5, C6, double channel operational amplifier U1A, double diode D1 and D2 constitute;Signal inverting amplification circuit is by resistance R8, R15, R16, capacitor C4, double channel operational amplifier U1B and protection diode T1 constitute.

[0004] As preferred, R1, R3, R4, R5, R7 are connected in series and then connected to pin 3 of double channel operational amplifier U1A, R9, R10, R11, R13, R14 are connected in series and then connected to pin 2 of double channel operational amplifier U1A.

[0005] As preferred, one end of resistance R2 is grounded, and the other end is connected to pin 3 of double channel operational amplifier U1A, both ends of resistance R12 are connected to pin 2 and pin 4 of double channel operational amplifier U1A respectively.

[0006] As preferred, double diode D1 is connected to pin 3 of double channel operational amplifier U1A, and double diode D2 is connected to pin 2 of double channel operational amplifier U1A.

[0007] As preferred, capacitor C1 and C2 are connected in parallel and then one end is connected to pin 8 of double channel operational amplifier U1A, and the other end is grounded, capacitor C5 and C6 are connected in parallel and then one end is connected to pin 4 of double channel operational amplifier U1A, and the other end is grounded.

[0008] As preferred, resistance R6 is connected between double channel operational amplifier U1A and double channel operational amplifier U1B, one end of capacitor C3 is grounded, and the other end is connected to resistance R6.

[0009] As preferred, one end of the resistor R15 is connected to pin 6 of the dual-channel operational amplifier U1B, and the other end is grounded, and the resistor R16 is connected to pin 6 and pin 7 of the dual-channel operational amplifier U1B in series.

[0010] As preferred, the capacitor C4 and the protection diode T1 are connected in parallel and connected to pin 7 of the dual-channel operational amplifier U1B in series with the resistor R8.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The utility model discloses a two-stage amplification circuit, which comprises a signal differential amplification circuit in the front half and a signal inverting amplification circuit in the back half. The signal amplification processing of the two parts can achieve better amplification effect and more significant signal amplification effect. The input voltage of the dual-channel operational amplifier U1A is clamped between -12V and +12V by the dual diodes D1 and D2, which aims to protect the operational amplifier and prevent it from being burned out by excessive voltage. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 It is a schematic diagram of the overall circuit of the utility model;

[0014] Fig. 2 It is a signal differential amplification circuit diagram of the utility model;

[0015] Fig. 3 It is a signal inverting amplification circuit diagram of the utility model. DETAILED DESCRIPTION

[0016] To further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects of the utility model are described in detail as follows in combination with the drawings and preferred embodiments.

[0017] Please refer to Figs. 1 to 3 The embodiment provides a kind of intelligent sensor signal processing circuit, including signal differential amplification circuit and signal inverting amplification circuit, signal differential amplification circuit is by resistance R1, R2, R3, R4, R5, R6, R7, R9, R10, R11, R12, R13, R14, capacitor C1, C2, C3, C5, C6, dual-channel operational amplifier U1A, dual diode D1 and D2 constitute;Signal inverting amplification circuit is by resistance R8, R15, R16, capacitor C4, dual-channel operational amplifier U1B and protection diode T1 constitute.

[0018] As preferred, R1, R3, R4, R5, R7 are connected in series and connected to pin 3 of the dual-channel operational amplifier U1A, and R9, R10, R11, R13, R14 are connected in series and connected to pin 2 of the dual-channel operational amplifier U1A.

[0019] As preferred, one end of the resistor R2 is grounded, and the other end is connected to pin 3 of the dual-channel operational amplifier U1A, and the two ends of the resistor R12 are connected to pin 2 and pin 4 of the dual-channel operational amplifier U1A, respectively.

[0020] As preferred, the dual diode D1 is connected to pin 3 of the dual-channel operational amplifier U1A, and the dual diode D2 is connected to pin 2 of the dual-channel operational amplifier U1A.

[0021] As preferred, the capacitors C1 and C2 are connected in parallel and one end is connected to pin 8 of the dual-channel operational amplifier U1A, and the other end is grounded, and the capacitors C5 and C6 are connected in parallel and one end is connected to pin 4 of the dual-channel operational amplifier U1A, and the other end is grounded.

[0022] As preferred, the resistor R6 is connected between the dual-channel operational amplifier U1A and the dual-channel operational amplifier U1B, and the capacitor C3 is connected with one end grounded and the other end connected to the resistor R6.

[0023] As preferred, one end of the resistor R15 is connected to pin 6 of the dual-channel operational amplifier U1B, and the other end is grounded, and the two ends of the resistor R16 are connected to pin 6 and pin 7 of the dual-channel operational amplifier U1B, respectively.

[0024] As preferred, the capacitor C4 and the protection diode T1 are connected in parallel and connected in series with the resistor R8 and connected to pin 7 of the dual-channel operational amplifier U1B.

[0025] The circuit is composed of two-stage amplification circuit, wherein the front half is a signal differential amplification circuit, and the signal amplification factor is R2 / (R1+R3+R4+R5+R7), at the same time, R2=R12, (R9+R10+R11+R13+R14)=(R1+R3+R4+R5+R7), and the two parts of the resistance need to be matched for synchronous amplification of the differential signal, and if the signal amplification factor needs to be changed, the four parts of the resistance need to be replaced accordingly; the dual diodes D1 and D2 can clamp the input voltage of the dual-channel operational amplifier U1A to -12V~+12V, aiming to protect the operational amplifier and prevent the operational amplifier from being burned out due to excessive voltage; the latter half is a signal inverting amplification circuit, and the signal amplification factor is 1+R16 / R15; through the signal amplification processing of the front and rear two parts, a better amplification effect can be achieved, and the signal amplification effect is more significant.

[0026] The protection diode T1 protects the latter circuit, the output of the double-channel operational amplifier U1B is maximum 10V, the capacitor C1 and C2 and the capacitor C5 and C6 can play the role of power filter, the resistor R6 and the capacitor C3 can play the role of first-order low-pass filter in cooperation, filter out the spur, the resistor R8 and the capacitor C4 can play the role of second-order low-pass filter in cooperation, filter out the spur.

[0027] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the technical solution of the present application, and any equivalent embodiments with equivalent changes and modifications are still within the scope of the present application.

Claims

1. A smart sensor signal processing circuit, characterized in that, It includes a signal differential amplifier circuit and a signal inverting amplifier circuit. The signal differential amplifier circuit consists of resistors R1, R2, R3, R4, R5, R6, R7, R9, R10, R11, R12, R13, R14, capacitors C1, C2, C3, C5, C6, a dual-channel operational amplifier U1A, and dual diodes D1 and D2. The signal inverting amplifier circuit consists of resistors R8, R15, R16, capacitor C4, a dual-channel operational amplifier U1B, and a protection diode T1.

2. The intelligent sensor signal processing circuit according to claim 1, characterized in that, R1, R3, R4, R5, and R7 are connected in series to pin 3 of the dual-channel operational amplifier U1A, and R9, R10, R11, R13, and R14 are connected in series to pin 2 of the dual-channel operational amplifier U1A.

3. The intelligent sensor signal processing circuit according to claim 1, characterized in that, One end of resistor R2 is grounded, and the other end is connected to pin 3 of the dual-channel operational amplifier U1A. The two ends of resistor R12 are connected to pins 2 and 4 of the dual-channel operational amplifier U1A, respectively.

4. The intelligent sensor signal processing circuit according to claim 1, characterized in that, The dual diodes D1 and D2 are connected to pin 3 of the dual-channel operational amplifier U1A.

5. The intelligent sensor signal processing circuit according to claim 1, characterized in that, After capacitors C1 and C2 are connected in parallel, one end is connected to pin 8 of the dual-channel operational amplifier U1A, and the other end is grounded. After capacitors C5 and C6 are connected in parallel, one end is connected to pin 4 of the dual-channel operational amplifier U1A, and the other end is grounded.

6. The intelligent sensor signal processing circuit according to claim 1, characterized in that, Resistor R6 is connected between dual-channel operational amplifier U1A and dual-channel operational amplifier U1B. One end of capacitor C3 is grounded, and the other end is connected to resistor R6.

7. The intelligent sensor signal processing circuit according to claim 1, characterized in that, One end of resistor R15 is connected to pin 6 of the dual-channel operational amplifier U1B, and the other end is grounded. The two ends of resistor R16 are connected to pins 6 and 7 of the dual-channel operational amplifier U1B, respectively.

8. The intelligent sensor signal processing circuit according to claim 1, characterized in that, The capacitor C4 and the protection diode T1 are connected in parallel and then in series with the resistor R8, and connected to pin 7 of the dual-channel operational amplifier U1B.

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