CN2156621Y - Electronic time relay - Google Patents

Abstract

The utility model provides an electronic time relay, which is composed of an unijunction transistor time delay circuit, and a zero cross self-triggering thyristor switch circuit. The time delay circuit is used for sending time pulse to the thyristor switch circuit, and consequently sending control signals to a controlled load. When the utility model is used, the time delay circuit and the controlled load can be connected with an automatic line in series in a simplest line connecting mode, and both alternating current and direct current can be used. The electronic time relay completely realizes the working mode with no source, and contactless control. The utility model has the advantages of small volume, light weight, and long service life reaching to 10 < 8 >, being a more ideal time delay control apparatus.

Description

Electronic time relay

The utility model relates to a kind of electronic time relay, belongs to the overrun control of a kind of electromechanical equipment robot control system(RCS) of electricity field.

The time relay is a kind of electromechanical equipment procedure auto-control device of extensive use.At present, use the more general time relay, majority is still the electromagnetic relay of mechanical contact, and its advantage is to be active in one's movements, and control precision is higher, its shortcoming is, mechanical contact uses long, can produce and touch corrosion and the colored phenomenon of setting fire, and useful life is short, even silver contact, its longest-lived also only are 10 ⁶Inferior.The shortcoming of this type of time relay for a change, the semiconductor time relay has appearred, this class relay has transistor time relay, integrated time relay and digital display time relay etc., these relays, its operating principle is the delay circuit that time delay process is made of transistor or integrated circuit, but actuator still is the little sensitive relay of band mechanical contact, though prolonged its useful life, but, they need independently working power, can not be connected on simultaneously on the transfer matic with controlled load during use, wiring is complicated, and the operating current of controlled load is less simultaneously.

The purpose of this utility model is to provide a kind of long service life, can seal in transfer matic simultaneously with controlled load, the simple electronic time relay of wiring simultaneously.

Electronic time relay provided by the utility model is made up of rectification circuit, delay circuit and switching circuit, and wherein delay circuit has adopted by adjustable unijunction transistor BTG and resistance R ₅, R ₆, R ₇, adjustable resistance W ₁, W ₂And capacitor C ₅The adjustable unijunction transistor delay circuit of forming, switching circuit is by controllable silicon MCR ₁, be connected to controllable silicon MCR after the parallel connection ₁The resistance R of negative electrode ₃With diode D ₅Be connected to the capacitor C between the controllable silicon MCR control utmost point and rectification circuit output negative pole ₃And be connected to capacitor C between the controllable silicon MCR control utmost point and negative electrode ₂The zero passage of forming is from the trigger switch circuit, and adjustable unijunction transistor delay circuit passes through resistance R ₄, diode D ₄To the control utmost point transmitting time pulse of controllable silicon MCR, trigger zero passage from triggering the reverse-blocking tetrode thyristor circuit working, send control signal to controlled load.The working power of adjustable unijunction transistor delay circuit is by after the controlled load, through bridge rectifier and by resistance R ₂, voltage-stabiliser tube DW ₁The reduction voltage circuit step-down of forming, and via capacitor C ₄With voltage-stabiliser tube DW ₂Provide after the voltage stabilizing circuit voltage stabilizing of forming.

The electronic time relay that the utility model provides is serially connected with in the circuit with controlled load, and its control principle is as described below, is that example is when the 220V AC signal is added in A, O two ends, through D with the interchange ₁-D ₄After the bridge circuit rectification of forming, by resistance R ₂Step-down punctures voltage-stabiliser tube DW ₁, again via capacitor C ₄, voltage-stabiliser tube DW ₂After the voltage stabilizing circuit voltage stabilizing of forming for delay circuit provides 12V operating voltage, this moment controlled load A.C. contactor J ₀Only go up by faint electric current, this electric current only for its attract current 0.3%) A.C. contactor is failure to actuate, when the 12V operating voltage is logical when coming, power supply is by adjustable resistance W ₁, resistance R ₅To capacitor C ₅Charging, therefore, adjustable unijunction transistor BTG and resistance R ₅Tie point b place current potential go up longly exponentially, behind setting-up time t, b point current potential is a little more than the control utmost point and the resistance R of adjustable unijunction transistor BTG ₇, adjustable resistance W ₂During tie point C point current potential, the unexpected conducting of adjustable unijunction transistor BTG, its negative electrode passes through resistance R ₄, diode D ₆To controllable silicon MCR ₁The control utmost point sends time pulse, triggers controllable silicon MCR ₁Conducting, and be capacitor C ₃Charging, controllable silicon MCR ₁Conducting is sent out control signal to controlled load, and A.C. contactor obtains 220V voltage and adhesive, has reached the purpose of time-delay.Because controllable silicon MCR ₁Conducting, capacitor C ₃Obtain charging current, C by the control utmost point ₃Current potential V _GdLast long to about 1.6V, be controllable silicon MCR automatically ₁Provide the zero cross fired electric current, to guarantee controllable silicon MCR ₁Be in full conducting (180 ℃) state, make controlled load keep adhesive, controllable silicon MCR ₁After the conducting, a point is reduced to about 2V with respect to d point current potential, at this moment voltage-stabiliser tube DW ₁Can not be breakdown, the delay circuit power supply of losing the job, capacitor C ₄Pass through resistance R ₇Tele-release to the greatest extent, capacitor C ₅By the inner PN junction of adjustable unijunction transistor, adjustable resistance W ₂Tele-release light, for time-delay next time is prepared.Because diode D ₅, D ₆, resistance R ₆, capacitor C ₃With controllable silicon MCR ₁, the zero passage that the GK structure has become the reverse-blocking tetrode thyristor circuit between the control utmost point and negative electrode is from trigger mechanism, when the power-supply system voltage zero-cross, and controllable silicon MCR ₁Obtain trigger current, conducting immediately behind the voltage zero-cross, and once more capacitor C ₃Be charged to about 1.6V, go round and begin again, constantly conversion.So as long as delay circuit is carried a time pulse to the reverse-blocking tetrode thyristor circuit, with controllable silicon MCR ₁Conducting will produce the zero cross fired electric current later on automatically, guarantees controllable silicon MCR ₁Full conducting makes controlled load keep "on" position always, when next one action arrives.

Electronic time relay provided by the utility model has been realized passive working method, can be serially connected on the transfer matic with controlled load to use always, wiring is simple, and is easy to use, also is fit to AC/DC, when using in DC circuit, polarity can directly not seal in transfer matic.This electronic relay has been realized contactless control fully, therefore, reaches 10 useful life ⁷-10 ⁸Inferior, simultaneously, good reliability, connect well, produce the phenomenon of spark when having avoided break-make fully, have explosion-proof performance, because used circuit structure design is reasonable, the electronic devices and components that use are few, and electronic time relay power consumptive province, the volume made are little, in light weight, and volume only is about 1/2nd of the existing semiconductor time relay.

Description of drawings:

Fig. 1, the utility model provide the electronic time relay electrical schematic diagram;

The access way presentation graphs of Fig. 2, electronic time relay that the utility model provides.

Wherein Jc is an A.C. contactor, and WDIS is an electronic time relay described in the utility model.

Embodiment:

Electronic time relay that the utility model provides, implement more or less freely, as long as by electric principle assembling shown in Figure 1.MCR wherein ₁Highly sensitive one-way SCR and rectifier diode D ₁-D ₅The adjustable unijunction transistor of BTG can be according to the requirement apolegamy of controlled load.

Claims (1)

1, a kind of electronic time relay is made up of rectification circuit, delay circuit and switching circuit, it is characterized in that above-mentioned delay circuit is by adjustable unijunction transistor BTG and resistance R ₅, R ₆, R ₇, adjustable resistance W ₁, W ₂And capacitor C ₅The adjustable unijunction transistor delay circuit of forming, above-mentioned switching circuit is by controllable silicon MCR ₁, be connected to controllable silicon MCR after the parallel connection ₁The resistance R of negative electrode ₃With diode D ₅Be connected to the capacitor C between the controllable silicon MCR control utmost point and rectification circuit output negative pole ₃And be connected to capacitor C between the controllable silicon MCR control utmost point and negative electrode ₂The zero passage of forming is from the trigger switch circuit, and adjustable unijunction transistor delay circuit passes through resistance R ₄, diode D ₄Control utmost point transmitting time pulse to controllable silicon MCR.

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