CN2211091Y - Automatic remote sensing acousto-optic signboard - Google Patents

Abstract

The utility model relates to an automatic remote sensing reputation marks tablet, its characterized in that: the method comprises the steps of remote sensing (1) for detecting an object entering an effective area; a signal amplification (2) for amplifying the remote sensing probe (1); a signal gate (3) for comparing the voltage signal output by the signal amplifier (2) with a rated voltage; a verbal alarm (4) for issuing a verbal prompt when an active level is received; a strobe light (5) for emitting a flashing light when an active level is received. The device can be arranged on a high-voltage electric appliance and is used for automatically detecting the human body entering a dangerous area and giving out sound and light alarm to prevent electric shock accidents.

Description

Automatic remote-sensing acoustooptic marking plate

The utility model relates to a kind of warning device.

In the prior art, electric utility and electric operation field generally have only poster formula warning board, because it has only motionless visual cues effect, so often make operating personnel ignore its existence, cause electric shock accidents.

The purpose of this utility model is to provide a kind of can survey the automatic remote sensing acousto-optic nameplate that enters the active zone object and can send cue automatically.

The technical solution of the utility model is: the signal input part of the induced signal output termination operational amplifier IC2 of remote sensing sensor IC 1, the amplifying signal output terminal of signal input " " termination operational amplifier IC2 of signal input "+" end of comparer IC3 and comparer IC4, signal input " " termination upper limit reference voltage terminal of comparer IC3, signal input "+" termination lower limit reference voltage terminal of comparer IC4, the output termination language warning circuit of comparer IC3 and comparer IC4 and the triggering input end of stroboscopic flasher circuit.

The utility model compared with prior art has following advantage:

(1). the utility model can send sound and light alarm simultaneously when people or other object are strayed into the warning active zone, the prompting incomer, in order to the prevention person of being strayed into continue enter and prompting operation person.

(2). remote sensing is available wide in variety, in order to survey different objects.

The utility model will be further described below in conjunction with drawings and Examples:

Accompanying drawing 1 is a circuit block diagram of the present utility model;

Accompanying drawing 2 is a circuit working schematic diagram of the present utility model;

Embodiment: referring to accompanying drawing 1 and accompanying drawing 2, remote sensing ［ 1 ］ can be used for surveying moving of human body, can select two kinds of probes for use, a kind of is passive infrared thermal radiation acquisition sensor, this sensor utilizes the pyroelectricity material temperature variant characteristics that polarize to survey the thermal radiation of human body, the sensing visual field is 106 degree * 96 degree, 5～7 meters of detection ranges.Another kind is the Doppler effect acquisition sensor of selecting for use in the accompanying drawing 2, and the characteristics of this probe are non-directional and the dead angle, and the effective radius of control is greater than 8 meters.In the accompanying drawing 2, IC1 is micropower doppler effect sensors module RD627, utilizes Doppler effect to make the movement of objects conversion of signals become level signal, and its inside is made up of oscillator, emitting head, Doppler's amplifier, detection amplitude limiter circuit.When the object or person body moves, produce frequency displacement between reflected signal and the original signal, through faint frequency shift signal is amplified,, obtain direct current output level with the movement of objects signal response after Doppler detects.When the output terminal of module moved at no object, quiescent output voltage was the supply voltage midrange.IC2(model LM324) is operational amplifier (promptly amplifying ［ 2 ］), is used for the output voltage of IC1 output is carried out the signal amplification corresponding to the signal in the accompanying drawing 1.Comparer IC3(model LM324), signal output part comparer IC4(model LM324) meets same-phase shaping comparer IC5(model LM324) input "+" end, the input of IC5 " " termination reference voltage terminal, the base stage of the output termination triode BG1 of comparer IC5, triggering input end, the language warning circuit that the output termination of IC6 is follow-up and the triggering input end of stroboscopic circuit of the collector order steady state trigger IC6 of triode BG1.The base stage of triode BG1 connects the start delay circuit of being made up of triode BG4, capacitor C 11, and in this start delay circuit, the collector of triode BG4 connects the base stage of BG1, and cross-over connection has capacitor C 11 between the base stage of triode BG4 and the ground.The window voltage comparator of being made up of comparer IC3, comparer IC4 detects the output signal of IC1 (promptly corresponding in the accompanying drawing 1 by regulating the upper and lower limit reference voltage

The three-phase full-bridge rectifier in source 8.

Referring to Fig. 2, the current transformer 1 among Fig. 1 is current transformer B1～B3; Negative pressure current rectifying and wave filtering circuit 2 among Fig. 1 is made up of backward dioded D1 and R1, C1, R3 and C2; Malleation current rectifying and wave filtering circuit 3 among Fig. 1 is made up of forward diode D2, D3 and C3, R2, C4, R4; Delay circuit 4 among Fig. 1 is made up of R5, R6, C6, D5; Electronic switch 5 among Fig. 1 is made of controllable silicon SCR; Electrical apparatus release 6 among Fig. 1 is made up of trip coil JQ and positive temperature coefficient resistor PTC; The three-phase full-bridge rectifier that electrical apparatus release power supply 7 among Fig. 1 is made up of six diode D6-D11.

In Fig. 2, current transformer B1～B3 is enclosed within respectively on A, B, the C three-phase power line of motor, and three current transformers become open delta connection.An openend O ground connection of this open-delta, another openend c connects the negative pressure current rectifying and wave filtering circuit, all the other two drift angle b, a meet forward diode D2, D3 respectively, the negative electrode of D2 and D3 and connect after connect the malleation current rectifying and wave filtering circuit of forming by C3, R2, C4 and R4.The output terminal of these two current rectifying and wave filtering circuits is connected to the input end of delay circuit again in the tandem of f point through a forward diode D4, delay circuit is made of electric resistance partial pressure and two link series connection of capacitance-resistance time-delay, and its time-delay output connects the silicon controlled control end.After connecting with resistance PTC, trip coil JQ, silicon controlled plus earth, anode insert in the output loop of three-phase full-bridge rectifier.

The principle of work of following analysis circuit:

When motor has when carrying, current transformer B1～B3 all has induced potential, the voltage U eo that their the resultant voltage u co that always inducts obtains behind the negative pressure current rectifying and wave filtering circuit is a negative value, the voltage U do that the induced potential u ao of induct resultant voltage u bo and the B1 of B1, B2 obtains behind the malleation current rectifying and wave filtering circuit on the occasion of, and Udo ≈-Ueo, the voltage U fo that suitably selects the ratio of R1, R3 and R2, R4 that f is ordered zero bear partially.Owing to following current of electric all the time, Udo and Ueo change, i.e. Δ Udo ≈-Δ Ueo, so that the voltage U fo that f is ordered is always under not phase failure situation is zero negative partially, it is controlled not constitute triggering

The condition of silicon is so power switch keeps normal power supply.

During the motor no-load, current transformer B1～B3 does not all have the voltage of inducting, and Udo and Ueo are zero, and Ufo also is zero, does not produce trigger pip, keeps closing position.

When the phase failure of A phase, B1 is not owing to the major loop no current has induced potential, and the alternating current in this moment motor only constitutes the loop by B, C two-phase, and Δ IB=-Δ IC, and the induced current opposite sign but equal magnitude of B2 and B3 at this moment is so u ca goes to zero.U ao goes to zero because A has no progeny mutually again, so u co goes to zero, Ueo also is zero, does not promptly have negative pressure.But because phase failure rear motor electric current is about just often 1.73 times; so the time u bo not only have but also also bigger than normal value; positive voltage Udo after the rectification also increases; the result makes voltage U fo that f orders for just; this voltage triggered controllable silicon conducting; trip coil JQ gets electric, starts tripping mechanism and cuts off three-phase supply, and motor is protected.When the controllable silicon conducting was initial, because positive temperature coefficient resistor PTC is in cold conditions, its resistance was very little, so can there be enough electric currents to make the JQ would trip in the loop.This electric current makes again that PTC heats up, resistance increases, as in the loop, back of tripping because of reasons such as winding back emf still have electric current, then PTC heats up rapidly, its resistance sharply increases, and loop current is reduced rapidly, thereby has protected the unlikely damage of the components and parts in the loop.

The circuit operation principle is same as described above after the B phase or the phase failure of C phase, repeats no more herein.

Because this circuit belongs to current-mode control, so no matter be the top curve or the lower collar thread phase failure of power switch, its automatic trip is cut off the electricity supply.

When the top curve of motor unexpected power failure in service or power switch, when lower collar thread disconnects, because the negative pressure filter capacitor C1, the C2 that select for use in the circuit are bigger than the capacity of malleation filter capacitor C3, C4, so the negative pressure life period is longer than malleation life period, be that the Ufo negative value can continue until the equal discharge off of C1～C4, so can not trigger controllable silicon, switch still is in closing position.

The utility model has the advantages that:

1. no matter the non-loaded combined floodgate that all do not affect is not arranged during phase shortage, improved the general of switch

Property has enlarged the scope of application of switch; Owing to adopted delay circuit, so can prevent from disturbing, three characteristics of the middle term plug-in strip does not always close and the misoperation that causes simultaneously when preventing actual combined floodgate;

2. as long as phase shortage appears in the top curve of switch, lower collar thread, switch all can move, and has strengthened the practicality of switch;

3. owing to adopted Steam Generator in Load Follow formula circuit, control can be from the motion tracking load variations, so improved the reliability of switch;

4. owing to increased the self-shield device, effectively overcome damage and the impact of component inside the Pass winding back emf is split, even the top curve of switch or lower collar thread connect instead also unlikely damage, thereby prolonged the service life of switch;

5. switch is convenient by dress, do not need the adapted A.C. contactor, to the motor of Fraquent start not, can be in the direct line attachment of regular tap, also can in the upper port of this switch or lower port be installed a plug-in strip or magnetic switch is used to the motor of Fraquent start, can directly seal in the power supply major loop robotization operation circuit or motor and unmanned monitoring motor, so install and use very simple and convenient.

Claims (3)

1, a kind of automatic remote sensing acousto-optic nameplate, it is characterized in that: the signal input part of the induced signal output termination operational amplifier IC2 of remote sensing sensor IC 1, the amplifying signal output terminal of signal input "-" termination operational amplifier IC2 of signal input "+" end of comparer IC3 and comparer IC4, signal input "-" termination upper limit reference voltage terminal of comparer IC3, signal input "+" termination lower limit reference voltage terminal of comparer IC4, the output termination language warning circuit of comparer IC3 and comparer IC4 and the triggering input end of stroboscopic flasher circuit.

2, automatic remote sensing acousto-optic nameplate according to claim 1, it is characterized in that: the signal output part of comparer IC3, comparer IC4 connects input "+" end of same-phase shaping comparer IC5, the input of IC5 " " termination reference voltage terminal, the base stage of the output termination triode BG1 of comparer IC5, triggering input end, the language warning circuit that the output termination of IC6 is follow-up and the triggering input end of stroboscopic circuit of the collector order steady state trigger IC6 of triode BG1.

3, automatic remote sensing acousto-optic nameplate according to claim 2, it is characterized in that: the base stage of triode BG1 connects the start delay circuit of being made up of triode BG4, capacitor C 11, in this start delay circuit, the collector of triode BG4 connects the base stage of BG1, and cross-over connection has capacitor C 11 between the base stage of triode BG4 and the ground.