CN2724298Y

CN2724298Y - Precisely timed delay switch

Info

Publication number: CN2724298Y
Application number: CN 200420083074
Authority: CN
Inventors: 陈涛; 宋刚
Original assignee: Tcl International Electric Huizhou Co ltd
Current assignee: TCL Legrand International Electrical Huizhou Co Ltd
Priority date: 2004-08-16
Filing date: 2004-08-16
Publication date: 2005-09-07
Anticipated expiration: 2014-08-16

Abstract

A precisely timed delay switch comprises an electronic switch, a circuit of periodic signal extraction of alternating current, and a time-delay control circuit and is characterized in that a counterIC1 is contained in the time-delay control circuit; the signal output terminal of the periodic signal extraction circuit of the alternating current is connected to the input terminal of the counter; between the output terminal of the chipIC1 and the electronic switch, at least a chipIC2 acting with a nand gate is arranged to adjust the delay time. The utility model is based on the commercial power frequency and adopts the digital method against the ac cycle of commercial power. The time-delay precision completely depends on the frequency accuracy of the electric network. The cost is comparatively low, the adjustment is exempt and the timing precision surpasses +-5%. Rather high time-delay precision can be reached even if commercial electrical network with different frequency requirements is switched in on the premise that the adjustment is not made.

Description

A kind of accurate timing delay switch

Technical field

The utility model relates to a kind of delay switch, is meant the accurate timing delay switch of control light fixture in a kind of lighting field especially.

Background technology

Timing circuit commonly used has capacitance-resistance RC charge-discharge circuit, capacitance-resistance RC vibration counting circuit, crystal oscillation counting circuit, CPU software timing circuit etc., and first kind of timing circuit is generally to use in the present delay switch; Second kind of its timing accuracy of timing mode influenced by the discreteness of RC and other device parameters, and timing accuracy is not very high, about more than ± 10%; With third and fourth kind of timing mode, its precision can be accomplished very high, but cost often exceeds a lot.Existing delay switch is widely used in the corridor, purpose mainly be realize in order to prevent altar lamp energy-conservation.In the market in the delay switch product of Xiao Shouing and the numerous pertinent literature, in the delay switch design of timing circuit almost stereotyped, all be that to adopt resistance capacitance be RC charge or discharge type circuit.The advantage of this type of timing circuit is that cost is low, but timing accuracy is also low, its precision regularly is subjected to factor affecting such as the multiplication factor, silicon controlled trigger current of the precision of resistance capacitance and supply voltage, control circuit triode, because timing capacitor generally adopts alminium electrolytic condenser, its capacity can reduce after having shelved a period of time, thereby also can influence the precision of timing, as adopt tantalum electric capacity then cost can increase and can not fundamentally solve the problem of timing accuracy difference.The precision of RC timing circuit is generally ± 35% at present, though most of user is less demanding to timing to be not to mind very much, but for indivedual more fastidious users and growing energy-conservation demand, design a kind of low cost, high accuracy and the timing circuit of exempting to debug just very necessary.

Summary of the invention

The purpose of this utility model provides the high delay switch of a kind of timing accuracy.

Designed a kind of timing delay switch according to above-mentioned purpose, comprised electronic switch, ac period signal extracting circuit, delay time control circuit, it is characterized in that the delay time control circuit contains counter IC ₁, the signal output part of ac period signal extracting circuit and the input of counter link, the break-make of delay time control circuit control electronic switch.

The counter IC that the delay time control circuit contains ₁, can be the digit counter of various systems, its effect is that ac period is counted, to obtain accurate delay time.

The another one embodiment is, in chip IC ₁Output and electronic switch between be provided with the chip IC of NAND gate effect ₂, at this moment play the chip IC of NAND gate effect ₂Has one at least.Its effect is to adjust delay time, to obtain suitable delay time.

The utility model is benchmark with the mains frequency, adopts the mode that the ac cycle of civil power is counted, and by the frequency accuracy decision of AC network, not only cost is lower fully for delay precision, and exempts from debugging, timing accuracy height.Because ac frequency fluctuation generally is lower than ± 2%, therefore can guarantee delay precision be higher than be ± 5%.Even under the unjustified prerequisite of the utility model, insert in the different city's electrical network of frequency requirement, also will reach quite high delay precision.

Description of drawings

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

Accompanying drawing 2 is circuit theory diagrams of the utility model one embodiment delay time control circuit.

Embodiment

Details are as follows to the operation principle of the utility model circuit with reference to accompanying drawing.

Referring to accompanying drawing 1, the utility model circuit comprises electronic switch, ac period signal extracting circuit, delay time control circuit composition, the light on and off of electronic switch control electric light, the ac period signal extracting circuit plays the effect of extracting the ac period signal from civil power, the delay time control circuit is by the counting to the ac period signal, the break-make of control electronic switch is characterized in that the delay time control circuit contains counter IC ₁, the signal output part of ac period signal extracting circuit and the input of counter link.

Referring to accompanying drawing 2 are circuit theory diagrams of the utility model one embodiment delay time control circuit.Counter chip IC ₁Be 14 binary addition counters, chip IC ₂The right and wrong door, the normally opened contact switch SW ₁With resistance R ₁, capacitor C, resistance R ₃Form differential circuit.Press SW ₁Produce a reset pulse afterwards and inject IC ₁The 11st pin CLR makes IC ₁The whole zero clearings of output, IC ₂The 3rd, 4,10 pin output all be high level.With IC ₂The 3rd pin is an example, and it, produces the ac period signal by the ac period signal extracting circuit and inject IC after the conducting of time control electronic switch for high level ₁Counting input end, zero passage is arranged 100 times, so IC in the per second in the alternating current per second of 50HZ ₁Count 100 times number, work as IC ₁Count Q ₁₁, Q ₁₂Be 1 o'clock, IC ₂The 1st, 2 pin be input as high level, the 3rd pin is output as low level, electronic switch turn-offs, the ac period signal also stops, IC ₁Counting stops, and plays the function of delay switch.

The user clicks SW again ₁, the then another time-delay counting of taking turns restarts.Delay time is counted Q by counter from complete zero ₁₁, Q ₁₂It is the decision of time of 1, promptly count 110000000000 (binary systems), in per second 100 times, every meter time interval once is 0.01 second, then the time is 110000000000 (binary system) * 0.01=3072 (decimal system) * 0.01=30.72 seconds, and visible delay precision is determined by the AC network frequency accuracy fully.

In like manner, if switch, with IC by change over switch ₂The delay time of the 4th pin or the 10th foot control system electronic switch, then can produce the time-delay of 61.44 seconds and 122.88 seconds, with the systematic error of nominal time be+2.4%, the ac frequency precision is ± 2%, so in the design ± 5% delay precision can guarantee fully, even directly insert the electrical network of 60HZ, delay precision also can guarantee in ± 20%.

If without IC ₂, directly by IC ₁The break-make of output control electronic switch, then can produce 20 seconds, 40 seconds, 80 seconds delay time, though circuit is more simplified, cost is lower, the time slice of 60 systems more meets people's custom.

Claims

1, a kind of accurate timing delay switch comprises electronic switch, ac period signal extracting circuit, delay time control circuit, it is characterized in that the delay time control circuit contains counter IC ₁, the signal output part of ac period signal extracting circuit and the input of counter link.

2, accurate timing delay switch according to claim 1 is characterized in that the break-make of the output control electronic switch of described delay time control circuit.

3, accurate timing delay switch according to claim 1 is characterized in that described counter IC1 can be the digit counter of various systems.

4, accurate timing delay switch according to claim 1 is characterized in that in the described delay time control circuit in chip IC ₁Output and electronic switch between be provided with the chip IC of NAND gate effect ₂, at this moment play the chip IC of NAND gate effect ₂Has one at least.