CN2251156Y - Electronic timer - Google Patents

Abstract

The utility model relates to an electronic timer which mainly solves the problem that when power supply is switched off in the prior art, preconditioning time is lost, and larger current output can not be provided. The utility model has the technical key tht an IC chip of an electronic alarm clock for a timing pulse circuit is adopted, and uninterrupted power supply is supplied for a memory cell circuit; one end of the coil of an AC contactor is connected with the joint of a relay, and the other end of the coil is connected with a control voltage of 220v; the joint of the AC contactor are connected with the power supply of an outside wire of 220v or 380v, and the power supply of heavy current can be realized. The utility model has the advantage of low cost, and the protection state and the memory state are not lost. The utility model can be used for timing opening occasions with larger power, such as a TV, wire broadcasting, a street lamp, a storehouse, a television emission machine room, etc.

Description

Electronic timer

The utility model relates to electronic installation, particularly a kind of timer.

As everyone knows, timer is the extremely wide popular electronic installation of a kind of purposes.The like product that existing market is sold mainly contains two types.A kind of is mechanical type, and another kind is an electron type.Mechanical shortcoming is that timing is short, low precision, and only be used for the electrical equipment of this class of washing machine.Though the electron type kind is more, common shortcoming is the memoryless device in outage back, causes preset time to lose, and big electric current output can't be provided.

The purpose of this utility model is to avoid the deficiency of above-mentioned prior art, and a kind of precision height is provided.High-power electronic timer.

Realize that the utility model purpose key problem in technology has three, one, utilize the IC chip of commercially available electronic alarm clock, finish moon, day, the time, branch the ON/OFF timing, the 2nd, state protection when realizing cutting off the power supply with uninterrupted charging circuit; The 3rd, realize providing of big electric current with small-sized A.C. contactor, to solve the interference of contact variation to large scale integrated circuit.Whole device is mainly by the IC timing chip, and integrator, mnemon, driver, A.C. contactor are formed.Wherein two groups of timing pulse signals are connected with mnemon by integrator respectively, and the output of mnemon links to each other with A.C. contactor by driver, and the A.C. contactor contact is connected with the outside line AC power.When start, chip IC ₁By presetting requirement, send set of pulses control signal, after the integrator smoothing processing, produce an electric potential signal, this signal removes to control the trigger S end of mnemon, and under the effect of S, Q keeps high level, the driver action, A.C. contactor is connected, and finishes start process.During shutdown, IC ₂Chip is sent set of pulses signal, behind integrator, remove to control the R end of trigger, under the effect of R, Q becomes low level by high level, driver is failure to actuate, and contactor disconnects, and finishes shutdown process, because the contactor contact connects outside line AC power (two-phase or three-phase), thereby reached the overall process of controlling forceful electric power with light current.

Followingly describe structure of the present utility model and principle of work in detail with reference to accompanying drawing

Fig. 1 is a functional-block diagram of the present utility model

Fig. 2 is a line assumption diagram of the present utility model

With reference to Fig. 1, the utility model is by the start chip IC ₁, the shutdown chip IC ₂Two-way, amplifier, two-way integrator, mnemon, uninterrupted power source, driver, A.C. contactor and direct supply are formed.Two groups of timing signal IC ₁, IC ₂After amplifying, by integrator 1, integrator 2 enters mnemon respectively.Uninterrupted power source directly is added on the mnemon, uses for its d type flip flop, gate circuit.

Among Fig. 2, triode T ₁, T ₂And peripheral cell C ₁, R ₁, R ₂Form IC ₁The amplifying circuit of pulse, wherein T ₂Be emitter follower, play buffer action.R ₃C ₂Form the power-on pulse integrator.Triode T ₄, T ₅And peripheral element C ₄, C ₅, R ₆, R ₇Constitute the shutdown chip IC ₂Amplifying circuit, R ₈C ₆Constitute the shutdown pip integrator.Triode T ₃, T ₆, social connections CMOS ₁, CMOS ₂, d type flip flop and peripheral element R ₄, R ₅, R ₉, R ₁₀Constitute mnemon.Relay J, triode T ₇, diode D ₁And resistance R ₁₁, R ₁₂Form driver.Integrated circuit A ₁, triode T ₈, diode D ₇, variable resistor W ₁, W ₂, resistance R ₁₃Constitute chargeable circuit.Relay J and coil L constitute A.C. contactor.The end of coil L connects the contact of relay J, and the other end is connected on the 220V control voltage, A.C. contactor contact P ₁, P ₂, P ₃Connect 220V or 380V external voltage.R ₁₄, capacitor C ₁₀Constitute and hold circuit, A ₁Pipe adopts the oscillator connection, and promptly 3 pin connect control tube T ₈Base stage, resistor W ₁Be connected A ₁4,8 pin and charging capacitor C ₁₀Between, for charging circuit provides reference voltage.Charging circuit and electric battery E constitute uninterrupted power source.Commutation diode D ₈, D ₄, D ₅, D ₆, transformer B, integrated package A ₂, diode D ₂, capacitor C ₇, C ₈, C ₉Constitute D.C. regulated power supply.From D ₃, D ₄The ac voltage signal of output is divided into two-way and connects, and leads up to W ₂And T ₈To electric battery E charging, lead up to D ₂And A ₂Carry out rectifying and voltage-stabilizing.From three terminal regulator A ₂The direct supply of output directly is added on driving circuit and the amplifying circuit, as its operating voltage.Electric battery E links to each other with d type flip flop, and the VCC voltage that electric battery E provides offers d type flip flop, door 1, door 2 and the T of mnemon ₃And T ₆Two pipes use.When the outside has a power failure, owing to the VCC that electric battery provided directly is added on the mnemon circuit, so running status is not subjected to have a power failure to be influenced.When incoming call, because Q keeps the high level current potential, the relay J action enters former preset condition, and need not manually to adjust after the outage again.T is passed through in the output of two-way integrator respectively ₃Pipe, social connections CMOS ₁, T ₆With social connections CMOS ₂Enter S, the R end of d type flip flop, pass through T from the open and close control signal of d type flip flop Q end output ₇, D ₁Pipe directly is added on the coil of relay, and control coil L conducting realizes that contact and outside line alternating current are switched on or switched off.

Principle of work of the present utility model is as follows:

(1) timing start-up process

By the timing start-up chip IC ₁The pulse that provides is through T ₁Give T after the amplification ₂Export to by R ₃C ₃The integrator of forming forms a current potential, under this current potential effect, and T ₃The pipe conducting, gate circuit CMOS ₁Input end is a low level, and behind door 1, d type flip flop S end has a direct impulse to produce, and under the positive pulse effect, Q becomes high level by low level, T ₇Conducting, the relay J action, alternating current 220V is connected on the line bag L of contactor, the A.C. contactor action, outside line 380V or 220V connect, and start process finishes.

(2) timing shutdown process

By the shutdown chip IC ₂The pulse that provides is through T ₄After amplifier amplifies, by emitter follower T ₅Emitter output, through R ₈, C ₆Behind the integration, T ₆Conducting, after door 2 was anti-phase, d type flip flop R end had a positive pulse to change, and Q becomes low level by high level, the relay J action, contact breaks away from, and the outside line contact disconnects, and shutdown process finishes.

(3) charging process

Integrated circuit A ₁Be the oscillator connection, the control signal of 3 pin output battery charging process, W ₁Mid point be the charging voltage reference potential, Fig. 2 is 12.3V.During start, C ₁₀Begin charging, 3 pin output this moment high level, T ₈End, charging stops.Work as C ₁₀On voltage rise gradually, 3 pin voltages are during greater than 5 pin current potentials, the upset of IC internal circuit, 7 pin are short circuit over the ground, at C ₁₀In the discharge process, 3 pin become low level, T over the ground ₈Conducting begins electric battery E is charged.Work as C ₁₀On voltage be lower than because of discharge

During 5 pin voltages, internal circuit overturns once more, and 7 pin disconnect C with ground ₁₀Begin charging, 3 pin become high level again.Last battery dynamically maintains on the end point voltage, for d type flip flop provides a continual voltage, guarantees that mnemon still keeps remember condition under off-position.

The utility model is the technical scheme of mnemon power supply owing to having adopted uninterrupted power source, thereby can realize the remember condition protection under the powering-off state.Simultaneously because the utility model adopts the IC chip of electronic alarm clock that open and close machine timing signal is provided, so reliability height, cost is low, in addition because the utility model is realized providing of big electric current with small-sized A.C. contactor, has solved the interference of contact variation to large scale integrated circuit.Type is analysed in this practicality can be widely used in the closed-circuit television machine room, and village wired broadcast, street lamp, warehouse, transmission of television machine room etc. need more powerful time opening occasion.

Integrated package A of the present utility model ₁Adopt the NE555 model; Integrated package A ₂Adopt 7815 models.

Claims (2)

1. an electronic timer comprises the timing pip circuit, amplifying circuit, and integrator, mnemon, driver is characterized in that:

1. the timing pip circuit adopts the IC chip of electronic alarm clock;

2. mnemon is connected with uninterrupted charging circuit, is implemented in the memory protect of off-position;

3. the end of ac contactor coil L is connected on the contact of relay J, and the other end is connected on the 220V control voltage, contactor contact P ₁, P ₂Connect 220V or 380V external voltage.

2. timer according to claim 1 is characterized in that the charging circuit A of uninterrupted power source ₁Adopt the oscillator connection, promptly 3 pin connect control tube T ₈Base stage, resistor W ₁Be connected A ₁4,8 pin and charging capacitor C ₁₀Between as the charging reference voltage.

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