CN209842008U

CN209842008U - Quick positioner of electric control circuit fault judgement

Info

Publication number: CN209842008U
Application number: CN201822212344.5U
Authority: CN
Inventors: 张宇
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-12-27
Filing date: 2018-12-27
Publication date: 2019-12-24
Anticipated expiration: 2028-12-27

Abstract

The utility model discloses a quick positioner is judged to electrical control return circuit trouble, including adjustable acquisition circuit, stabilize amplifier circuit and clamp warning circuit, resistance R1 among the adjustable acquisition circuit, R2 and rheostat RL1 establish ties and form adjustable sampling resistance branch road, select the shelves to the resistance regulation of rheostat RL1 to the device according to the rated operating voltage size of the electronic equipment that breaks down, improve the detection range of device, stabilize amplifier circuit fortune ware U2, U3 and triode voltage stabilizing circuit form closed loop and stabilize and amplify, improve the stability and the reliability that voltage signal enlargies; utilize diode clamp circuit principle to prevent among the clamp alarm circuit that the output voltage of stabilizing amplifier circuit is too big to cause the damage to MOS pipe Q1, guarantee the security of device, when appearing unusual heavy current because of the fault in the return circuit, clamp alarm circuit sends audible-visual alarm signal, and the suggestion maintainer should locate to have the trouble to reach the mesh of quick location fault location, have fine practicality.

Description

Quick positioner of electric control circuit fault judgement

Technical Field

The utility model relates to an electric control circuit fault detection technical field especially relates to a quick positioner of electric control circuit fault judgement.

Background

The electric control loop fault is a phenomenon which is inevitable in the use process of the electronic equipment, and the rapid positioning of the fault judgment is a technology for rapidly solving the fault, so that the workload of electronic equipment maintainers can be reduced, more importantly, the delay time of actual production operation can be reduced, and the rapid positioning device for the electric control loop fault judgment is particularly important. However, in the actual use process, when the existing fault judgment quick positioning device overhauls electronic equipment with different rated working voltages, the voltage at the fault position of the electric control loop may have a large difference, so that the device has potential safety hazards due to exceeding the detection range, and has great use limitation.

So the utility model provides a new scheme to solve the problem.

SUMMERY OF THE UTILITY MODEL

To the above situation, in order to overcome the defects of the prior art, an object of the present invention is to provide a quick positioning device for electrical control loop fault determination.

The technical scheme for solving the problem is as follows: a quick positioning device for fault judgment of an electrical control loop comprises an adjustable acquisition circuit, a stable amplification circuit and a clamping alarm circuit; the adjustable acquisition circuit comprises a rheostat RL1, one end of the rheostat RL1 is connected with the inverting input end of the operational amplifier U1 and is connected with the detection electrode tip P1 through a resistor R1, the other end of the rheostat RL1 is connected with the non-inverting input end of the operational amplifier U1 and is connected with the detection electrode tip P2 through a resistor R2, two ends of the rheostat RL1 are further connected with a zener diode DZ1 in parallel, the output end of the operational amplifier U1 is connected with the base of a triode VT1 and one end of a capacitor C1 through a resistor R3, the other end of the capacitor C1 is grounded, the collector of the triode VT1 is connected with a +12V power supply through a resistor R4, and the emitter of the.

Preferably, the stable amplifying circuit comprises an operational amplifier U2, a non-inverting input terminal of the operational amplifier U2 is connected to an emitter of a transistor VT1, an inverting input terminal of the operational amplifier U2 is connected to an output terminal of the operational amplifier U2, one terminal of a resistor R6 and a collector of the transistor VT2 through a capacitor C2, the other terminal of the resistor R6 is connected to a base of the transistor VT2, one terminal of the capacitor C3 and a cathode of a zener diode DZ2, the other terminal of the capacitor C3 is connected to an anode of a zener diode DZ2 in parallel and grounded, an emitter of the transistor VT2 is connected to a non-inverting input terminal of the operational amplifier U3 through a resistor R7, and an inverting input terminal of the operational amplifier U3 is connected to an output terminal of the operational amplifier U3 and an inverting input terminal of.

Preferably, the clamping alarm circuit comprises diodes VD1 and VD2, an anode of the diode VD1 and a cathode of the diode VD2 are connected with an emitter of a triode VT2 and a cathode of a zener diode DZ3, an anode of the diode VD2 is grounded, a cathode of the diode VD1 is connected with a +12V power supply and a drain of a MOS transistor Q1 through a resistor R9, an anode of the zener diode DZ3 is connected with a gate of the MOS transistor Q1, a source of the MOS transistor Q1 is connected with one ends of resistors R10 and R11, the other end of the resistor R10 is grounded through a buzzer LS1, and the other end of the resistor R11 is grounded through an indicator light LED 1.

Through the technical scheme, the beneficial effects of the utility model are that:

1. the utility model discloses resistance R1, R2 and rheostat RL1 establish ties among the adjustable acquisition circuit and form adjustable sampling resistance branch road, adjust the resistance of rheostat RL1 to the device according to the electronic equipment rated operating voltage size that breaks down and select the shelves, improve the detection range of device, when the unusual heavy current appears because of the fault in the return circuit, buzzer LS1, pilot lamp LED1 send audible and visual alarm signal, the suggestion maintainer has the trouble in this department, thereby reach the purpose of quick location fault position, have fine practicality;

2. the stable amplifying circuit operational amplifier U2 further amplifies the output voltage of the adjustable acquisition circuit, then sends the amplified output voltage into the triode voltage stabilizing circuit for voltage stabilizing processing, and the operational amplifier U3 feeds the output signal of the triode voltage stabilizing circuit back to the operational amplifier U2 to form closed-loop stable amplification, thereby improving the stability and reliability of voltage signal amplification;

3. the output voltage of the stable amplifying circuit is controlled to be output within the range of 0-5V by utilizing the principle of a diode clamping circuit in the clamping alarm circuit, the MOS transistor Q1 is prevented from being damaged due to the fact that the output voltage of the stable amplifying circuit is too large, and the safety of the device is guaranteed.

Drawings

Fig. 1 is a block diagram of the system of the present invention.

FIG. 2 is a schematic circuit diagram of the present invention

Detailed Description

The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings 1 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

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

A quick positioning device for fault judgment of an electrical control loop comprises an adjustable acquisition circuit, a stable amplification circuit and a clamping alarm circuit. The adjustable acquisition circuit comprises a rheostat RL1, one end of the rheostat RL1 is connected with the inverting input end of the operational amplifier U1 and is connected with the detection electrode tip P1 through a resistor R1, the other end of the rheostat RL1 is connected with the non-inverting input end of the operational amplifier U1 and is connected with the detection electrode tip P2 through a resistor R2, two ends of the rheostat RL1 are further connected with a zener diode DZ1 in parallel, the output end of the operational amplifier U1 is connected with the base of a triode VT1 and one end of a capacitor C1 through a resistor R3, the other end of the capacitor C1 is grounded, the collector of the triode VT1 is connected with a +12V power supply through a resistor R4, and the emitter of the.

The resistors R1 and R2 and the varistor RL1 are connected in series to form an adjustable sampling resistor branch, the voltage division principle is utilized to know that the resistance value of the varistor RL1 can change the size of sampling voltage input into the operational amplifier U1, so that the adjustable voltage is well adjustable when electronic equipment with different rated working voltages is overhauled, the Zener diode DZ1 plays a role in stabilizing the sampling voltage at the input end of the operational amplifier U1, the sampling voltage forms differential amplification at two input ends of the operational amplifier U1, common-mode signal interference is effectively inhibited, an output signal of the operational amplifier U1 is sent into the triode VT1 after being filtered by the RC formed by the resistor R3 and the capacitor C1, and the emitter follower principle is utilized to amplify the output signal of the operational amplifier U1, so that the intensity of the sampling voltage is effectively improved.

The stable amplifying circuit comprises an operational amplifier U2, wherein the non-inverting input end of the operational amplifier U2 is connected with the emitter of a triode VT1, the inverting input degree of the operational amplifier U2 is connected with the output end of an operational amplifier U2, one end of a resistor R6 and the collector of a triode VT2 through a capacitor C2, the other end of the resistor R6 is connected with the base of a triode VT2, one end of a capacitor C3 and the cathode of a zener diode DZ2, the other end of the capacitor C3 is connected with the anode of a zener diode DZ2 in parallel and grounded, the emitter of a triode VT2 is connected with the non-inverting input end of the operational amplifier U3 through a resistor R7, and the inverting input end of an operational amplifier U3 is connected with the output end of an operational amplifier U3 and the inverting. The operational amplifier U2 further amplifies the output voltage of the adjustable acquisition circuit, the amplified voltage signal is sent to a triode voltage stabilizing circuit composed of a triode VT2, a resistor R6, a capacitor C3 and a voltage stabilizing diode DZ2 for voltage stabilizing processing, the output signal of the triode voltage stabilizing circuit is sent to the operational amplifier U3 for feedback, closed loop stable amplification is formed, and the stability and reliability of voltage signal amplification are improved.

Diodes VD1, VD2 in the clamp alarm circuit form a diode clamp circuit to clamp the output voltage signal of the stable amplifying circuit, the anode of diode VD1, the cathode of diode VD2 connect the emitter of triode VT2 and the cathode of zener diode DZ3, the anode of diode VD2 is grounded, the cathode of diode VD1 connects the +12V power supply and the drain of MOS tube Q1 through resistor R9, the anode of zener diode DZ3 connects the grid of MOS tube Q1, the source of MOS tube Q1 connects one end of resistors R10, R11, the other end of resistor R10 is grounded through buzzer LS1, the other end of resistor R11 is grounded through indicator LED 1. The resistor R9 divides the voltage of the +12V power supply and sends the voltage to the diode clamping circuit, the output voltage of the stable amplifying circuit is controlled within the range of 0-5V to be output, and the output voltage is stabilized by the voltage stabilizing diode DZ3 and then serves as a control signal to drive the MOS transistor Q1 to work.

The utility model discloses when specifically using, at first select the shelves to the device according to the rated operating voltage size of the electronic equipment that breaks down, adjust rheostat RL 1's resistance promptly, the resistance regulation that becomes rheostat RL1 is more big and less when the rated operating voltage of electronic equipment, and specifically adjust the resistance and decide according to resistance R1, R2, so do not specifically limit here. The detection electrode tips P1 and P2 are respectively connected to an electric control loop to be detected, abnormal large current in the loop is sampled and then sent to an operational amplifier U1, the abnormal large current is filtered by an RC and then sent to a triode VT1, and an output signal of the operational amplifier U1 is amplified by utilizing an emitter follower principle, so that the intensity of sampling voltage is effectively improved. In order to enable the sampling voltage to reach the driving voltage of an MOS (metal oxide semiconductor) tube Q1 in the clamping alarm circuit, the output voltage of the adjustable acquisition circuit is further amplified by the operational amplifier U2 of the stabilizing amplification circuit and then is sent to the triode voltage stabilizing circuit for voltage stabilizing treatment, and the output signal of the triode voltage stabilizing circuit is fed back to the operational amplifier U2 by the operational amplifier U3 to form closed-loop stable amplification, so that the stability and reliability of voltage signal amplification are improved. In order to prevent the MOS transistor Q1 from being damaged by overlarge output voltage of the stabilizing amplifying circuit, the output voltage of the stabilizing amplifying circuit is controlled to be output within the range of 0-5V by using the principle of a diode clamping circuit in the clamping alarm circuit, and the safety of the device is ensured. When abnormal large current occurs in the loop due to faults, the grid of the MOS tube Q1 is electrified and conducted, so that the buzzer LS1 and the indicator light LED1 are electrified and conducted at the same time, an audible and visual alarm signal is sent out, the trouble at the position is prompted to a maintainer, and the purpose of quickly positioning the fault position is achieved.

To sum up, the utility model discloses circuit design is simple ingenious, can carry out the gear selection according to electronic equipment rated operating voltage size, and fault detection safe and reliable, stability is high, has fine development value and practical value.

The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.

Claims

1. The utility model provides an electric control circuit fault diagnosis quick positioner which characterized in that: the device comprises an adjustable acquisition circuit, a stable amplification circuit and a clamping alarm circuit;

the adjustable acquisition circuit comprises a rheostat RL1, one end of the rheostat RL1 is connected with the inverting input end of the operational amplifier U1 and is connected with the detection electrode tip P1 through a resistor R1, the other end of the rheostat RL1 is connected with the non-inverting input end of the operational amplifier U1 and is connected with the detection electrode tip P2 through a resistor R2, two ends of the rheostat RL1 are further connected with a zener diode DZ1 in parallel, the output end of the operational amplifier U1 is connected with the base of a triode VT1 and one end of a capacitor C1 through a resistor R3, the other end of the capacitor C1 is grounded, the collector of the triode VT1 is connected with a +12V power supply through a resistor R4, and the emitter of the.

2. The electrical control loop fault judgment fast positioning device of claim 1, wherein: the stable amplifying circuit comprises an operational amplifier U2, wherein the non-inverting input end of the operational amplifier U2 is connected with the emitter of a triode VT1, the inverting input degree of the operational amplifier U2 is connected with the output end of an operational amplifier U2, one end of a resistor R6 and the collector of a triode VT2 through a capacitor C2, the other end of the resistor R6 is connected with the base of a triode VT2, one end of a capacitor C3 and the cathode of a zener diode DZ2, the other end of the capacitor C3 is connected with the anode of a zener diode DZ2 in parallel and grounded, the emitter of a triode VT2 is connected with the non-inverting input end of the operational amplifier U3 through a resistor R7, and the inverting input end of an operational amplifier U3 is connected with the output end of an operational amplifier U3 and the inverting input.

3. The electrical control loop fault judgment fast positioning device according to claim 2, characterized in that: the clamping alarm circuit comprises diodes VD1 and VD2, the anode of the diode VD1 and the cathode of the diode VD2 are connected with the emitter of a triode VT2 and the cathode of a voltage stabilizing diode DZ3, the anode of the diode VD2 is grounded, the cathode of the diode VD1 is connected with a +12V power supply and the drain of an MOS tube Q1 through a resistor R9, the anode of the voltage stabilizing diode DZ3 is connected with the grid of an MOS tube Q1, the source of the MOS tube Q1 is connected with one ends of resistors R10 and R11, the other end of the resistor R10 is grounded through a buzzer LS1, and the other end of the resistor R11 is grounded through an indicator light LED 1.