CN203352909U

CN203352909U - Long delay LED lighting switch control circuit

Info

Publication number: CN203352909U
Application number: CN2013204443442U
Authority: CN
Inventors: 李钊英; 刘大伟; 周党培; 钟广宇; 文良平
Original assignee: MLS Co Ltd
Current assignee: MLS Co Ltd
Priority date: 2013-07-20
Filing date: 2013-07-20
Publication date: 2013-12-18
Anticipated expiration: 2023-07-20

Abstract

The utility model relates to a long delay LED lighting switch control circuit characterized by comprising a step-down rectifying circuit, an LED main loop, and a delay control circuit, wherein delay control circuit and the step-down rectifying circuit are respectively and electrically connected with the LED main loop; the delay control circuit comprises a binary system serial counter, a power on reset circuit, an oscillation circuit, a negative feedback resistor R4, a first diode D1 and an eighth resistor R8, a tenth resistor R10 and a field effect transistor Q2; the binary system serial counter is respectively and electrically connected with the power on reset circuit, the oscillation circuit, the negative feedback resistor R4, the first diode D1, the eighth resistor R8 and the tenth resistor R10. The long delay LED lighting switch control circuit can be built in a bulb so as to directly replace a normal bulb, usage is very convenient; the long delay LED lighting switch control circuit is long in delay time, and the delay time ranges from a couple of minutes to hours or even to tens of hours. The long delay LED lighting switch control circuit is long in service life, and employs non-electrolytic capacitor.

Description

A kind of long delay LED lighting switch control circuit

Technical field

The utility model relates to the LED lighting technical field, particularly relates to a kind of long delay LED lighting switch control circuit.

Background technology

The LED lamp has become electric light source of new generation with its advantage such as efficient, energy-conservation, long-lived, early stage LED lighting technology is mainly used in powerful street lamp and landscape design, along with the progress of technology, the LED illumination has started to stride forward to fields such as commercialization illumination, public illumination and lighting of home comprehensively.In order further to improve energy-saving effect, in some public illumination occasion (as corridor lighting), adopt time delay to control the switch of LED lamp, in addition, in the household use, the time delay of using the LED lamp for the special requirement function of turning off the light is also arranged.At present, the delay time that this time delay is turned off the light generally only has a few minutes, can not meet some needs reach tens of minutes occasion of the long-time time delay of a few hours (as delayed lamp of the front use of falling asleep) even.

General delay switch adopts the RC delay circuit mostly at present, for the delay time that obtains growing, electric capacity adopts electrochemical capacitor, because the parameters such as the electric leakage of electrochemical capacitor and equivalent series resistance are larger and unstable, cause delay time very inaccurate, the short time time delay that can only be applied in less demanding several minutes is controlled, in addition, also having a kind of is the delay circuit that adds that on the RC basis 555 time-base circuits form, the former is accurate for its short time time delay control ratio, but the restricted impact of RC parameter, the long delay time appoints so inaccurate, and widely different between product.

As can be seen here, the time delay of the at present LED illumination control of turning off the light, controlling duration can not satisfy the demand, require further improvement, therefore, found the long delay LED lighting switch control circuit that a kind of delay time is long, delay time is accurate, the life-span is long, reliability is high, volume is little, cost is low, need badly at present.

The utility model content

The purpose of this utility model is to provide a kind of long delay LED lighting switch control circuit, makes it have advantages of that delay time is long, the life-span is long, reliability is high, thereby has overcome the deficiencies in the prior art.

For solving the problems of the technologies described above, a kind of long delay LED of the utility model lighting switch control circuit, comprise step-down rectifying circuit, LED major loop, delay control circuit, described delay control circuit, step-down rectifying circuit are electrically connected to the LED major loop respectively, wherein: described delay control circuit comprises binary string linage-counter, electrify restoration circuit, oscillating circuit, negative feedback resistor R4, the first diode D1 and the 8th resistance R 8, the ten resistance R 10, field effect transistor Q2; Described binary string linage-counter is electrically connected to electrify restoration circuit, oscillating circuit, negative feedback resistor R4, the first diode D1, the 8th resistance R 8, the tenth resistance R 10 respectively.

Further, also comprise decompression rectifier filter circuit, described step-down rectifying circuit is connected with described delay control circuit by decompression rectifier filter circuit; Described decompression rectifier filter circuit comprises the second resistance R 2, the second capacitor C 2, the second diode D2 that connect with the second resistance R 2.

Described step-down rectifying circuit comprises the first capacitor C 1, with the first resistance R 1 of the first capacitor C 1 parallel connection and the rectifier bridge BR1 that connects with the first capacitor C 1 and the first resistance R 1 respectively.

Described LED major loop comprises LED string, the pliotron connect with the LED series winding by collector electrode and the 7th resistance R 7 be connected with the pliotron emitter.

Described electrify restoration circuit comprises the 3rd resistance R 3 and the 3rd capacitor C 3 be connected with described binary string linage-counter respectively.

Described oscillating circuit comprises the 4th capacitor C 4 and the 5th resistance R 5 be connected with the binary string linage-counter respectively.

Described binary string linage-counter adopts 14 grades of binary string linage-counter CD4060.

Described electric capacity adopts no electrolytic capacitor.

Described electric capacity adopts little electric capacity leaded multilayer ceramic capacitor.

After adopting above technical scheme, the utility model has following useful technique effect compared with the prior art:

1, the utility model long delay LED lighting switch control circuit can be built in bulb, directly replaces general bulb, and it is extremely convenient to use;

2, the utility model delay time is long, can be from several minutes to several hours even tens of hours.

3, the utility model life-span long, adopt no electrolytic capacitor.

4, the utility model reliability is high, there is no large electrolysis, and surge current is minimum; Adopt the resistance-capacitance depressurization current limliting, LED is safe, cost is low, and volume is little, and reliability is high, can be placed in being made of one product in the LED bulb, the convenient replacement.

Below by drawings and Examples, the technical solution of the utility model is described in further detail.

The accompanying drawing explanation

Above-mentioned is only the general introduction of technical solutions of the utility model, and in order to better understand the utility model, below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.

Fig. 1 is the circuit theory diagrams of the utility model long delay LED lighting switch control circuit.

Fig. 2 is the circuit theory diagrams of the utility model specific embodiment.

Embodiment

Refer to shown in Fig. 1, the utility model long delay LED lighting switch control circuit, this circuit comprises step-down rectifying circuit, LED major loop, delay control circuit, described delay control circuit, step-down rectifying circuit are electrically connected to the LED major loop respectively, wherein: described delay control circuit comprises binary string linage-counter, electrify restoration circuit, oscillating circuit, negative feedback resistor R4, the first diode D1 and the 8th resistance R 8, the ten resistance R 10, field effect transistor Q2; Described binary string linage-counter is electrically connected to electrify restoration circuit, oscillating circuit, negative feedback resistor R4, the first diode D1, the 8th resistance R 8, the tenth resistance R 10 respectively.

Wherein, step-down rectifying circuit comprises electric capacity the first capacitor C 1, the first resistance R 1, rectifier bridge BR1, its input is electrically connected to live wire and the zero line of single-phase alternating current, the sinusoidal half cycles direct current of output ripple after the first capacitor C 1 step-down and BR1 rectification, the positive pole of its output and the second resistance R 2, the six resistance R 6 and LED is electrically connected to.

The LED major loop comprises the LED string, pliotron Q1 and the 7th resistance R 7, the positive pole of LED string is connected with the output head anode of diode bridge BR1, the negative pole of LED string is electrically connected to the collector electrode of Q1, the base biasing resistor that the 6th resistance R 6 is Q1, when the pulsating voltage of BR1 output rises to the Q1 conducting, the LED major loop has electric current to flow through, and LED is luminous; When the pulsating voltage of BR1 output drops to the Q1 cut-off, the LED major loop does not have electric current to flow through, and LED does not work; Be LED string be operated in frequency be 2 times under the periodic current of power frequency.

Decompression rectifier filter circuit comprises the second resistance R 2, the second capacitor C 2 and the second diode D2, for delay control circuit provides the galvanic current source.

Delay control circuit comprises 14 grades of binary string linage-counter CD4060 and peripheral cell the 3rd capacitor C 3, the three resistance R 3, the four capacitor C 4, the four resistance R 4, the five resistance R 5, the first diode D1 thereof, the 8th resistance R 8, the ten resistance R 10 and field effect transistor Q2.

Wherein, the 3rd capacitor C 3 and the 3rd resistance R 3 form the electrify restoration circuit of CD4060, switch on power moment, and CD4060 resets, internal counter zero clearing, each output pin Qn output low level.

The 5th resistance R 5 and the 4th capacitor C 4 form the oscillating circuit of CD4060, and be cycle of oscillation: T=2.2 * R5 * C4, and the negative feedback resistor that the 4th resistance R 4 is the internal inverted amplifier, can make vibrational stabilization; The rear CD4060 that resets is counted at the trailing edge of each cycle of oscillation, and the time of counter output Qn output high level is: Tn=2n * T.When counter (214) individual cycle of oscillation that calculates the 16384th, Q14 pin output high level, through the 8th resistance R 8, the tenth resistance R 10 dividing potential drop rear drive field effect transistor Q2 conductings, thus the Q1 base potential is moved to ground, the Q1 cut-off, LED extinguishes, and reaches the purpose of turning off the light.Simultaneously, the high level of Q14 pin output is connected to R4 through the first diode D1, the end of C4 and R5, make CD4060 internal oscillator failure of oscillation, counter stops counting, and the output of Q14 pin is locked into high level, LED keeps extinguishing state, until powered-down reopen and just restart circuit.

The utility model long delay LED lighting switch control circuit adopts the method for 14 grades of binary countings to carry out timing, utilize little electric capacity (as leaded multilayer ceramic capacitor etc.) and high-precision resistance to produce a short time benchmark (cycle of oscillation) more accurately, 2 14 powers that the longest timing time can reach this benchmark by counter are (16384 times) doubly, therefore can obtain the long delay time (as needs further improve timing accuracy, can change the RC oscillating circuit into crystal oscillating circuit and get final product) more accurately.

In addition, after the timing of this circuit finishes, utilize the high level of output to form immediately self-locking, off state is kept, until reopen power supply next time always.Under off state, circuit, in micro-power consumption state, so not only meets the needs of practical application, reaches energy-conservation purpose simultaneously.

Below specifically to further illustrate by a specific embodiment:

Refer to shown in Fig. 2: following is the cases of design of 6W LED bulb lamp: specified input voltage is 220VAC, and power is 6W.

Be T=2.2*R5*C4=2.2*50k*2.2u=242ms cycle of oscillation (time reference);

Delay time is T14=16384*0.242=3964s=1.1h (elapsed time: approximately 1 hour);

The LEDs specification is 40 3014 white light LEDs series connection.

Delay time of the present utility model can be regulated corresponding component parameters according to actual needs, and this circuit theory is simple, and cost is low, and volume is little, and reliability is high, can be built in the LED lamp interior.

The above; it is only preferred embodiment of the present utility model; not the utility model is done to any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection range of the present utility model.

Claims

1. a long delay LED lighting switch control circuit, is characterized in that comprising step-down rectifying circuit, LED major loop, delay control circuit, and described delay control circuit, step-down rectifying circuit are electrically connected to the LED major loop respectively, wherein:

Described delay control circuit comprises binary string linage-counter, electrify restoration circuit, oscillating circuit, negative feedback resistor R4, the first diode D1 and the 8th resistance R 8, the ten resistance R 10, field effect transistor Q2;

Described binary string linage-counter is electrically connected to electrify restoration circuit, oscillating circuit, negative feedback resistor R4, the first diode D1, the 8th resistance R 8, the tenth resistance R 10 respectively.

2. long delay lighting switch control circuit according to claim 1, characterized by further comprising decompression rectifier filter circuit, and described step-down rectifying circuit is connected with described delay control circuit by decompression rectifier filter circuit;

Described decompression rectifier filter circuit comprises the second resistance R 2, the second capacitor C 2, the second diode D2 that connect with the second resistance R 2.

3. long delay lighting switch control circuit according to claim 1 is characterized in that:

4. long delay lighting switch control circuit according to claim 1 is characterized in that:

5. long delay lighting switch control circuit according to claim 1 is characterized in that:

6. long delay lighting switch control circuit according to claim 1 is characterized in that:

7. long delay lighting switch control circuit according to claim 1 is characterized in that:

8. according to the described long delay lighting switch of claim 1-7 any one control circuit, it is characterized in that:

Described electric capacity adopts no electrolytic capacitor.

9. long delay lighting switch control circuit according to claim 8 is characterized in that: