CN212876154U

CN212876154U - Flashing breath lamp control circuit

Info

Publication number: CN212876154U
Application number: CN202021786196.9U
Authority: CN
Inventors: 陈健; 唐福顺; 李明
Original assignee: Tangshan Institute Of Labor Technology
Current assignee: Tangshan Institute Of Labor Technology
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2021-04-02
Anticipated expiration: 2030-08-24

Abstract

The utility model discloses a scintillation breathing lamp control circuit. The flash breathing lamp control circuit comprises a square wave generating unit, a driving control unit and a main circuit unit. The output end of the square wave generating unit is connected with the CP end of the driving control unit and provides a square wave signal; the output end of the driving control unit is connected with the control end of the main circuit unit and used for controlling the time interval and the brightness of the lighting of the flickering breathing lamp. The square wave generating unit of the circuit is a gate multi-harmonic oscillator consisting of a NOT gate chip SN74AHC1G04, no additional power supply is needed, and the cost is saved; in addition, the output terminal of the circuit driving control unit is a pulse output circuit consisting of a displacement counter CD4017, the resistors with equal proportional series resistance values are connected at intervals at the output end, the time interval and the brightness of the LED lighting are controlled, and the circuit driving control unit can be widely applied to various fields of digital products, computers, sound equipment, automobiles and the like, and plays a good role in visual decoration and reminding indication.

Description

Flashing breath lamp control circuit

Technical Field

The utility model relates to an electronic circuit field, concretely relates to pilot lamp field is reminded to electron.

Background

In the intelligent era, indicator lamps on various electronic products are very practical functions like flashlights, the electronic products are informed of new notifications by flashing of the indicator lamps, the colors of the indicator lamps can be customized according to the types of the notifications, and even the colors can be customized for a certain App. Currently, there are two main types of indicator lights in the prior art: the flashing light and the breathing light, however, the two types of indicator lights have single functions, only flash or only change the brightness, and after a long time, the reminding effect is numb for the client, and the effect is greatly reduced. In addition, the indicating lamp in the prior art is mostly controlled by a single chip type programming chip, codes need to be written and tested, the operation difficulty is high, and the complexity is high.

Disclosure of Invention

In order to solve at least one problem, the utility model discloses a flash breath lamp, which has simple structure, does not need programming, and can flash and change the brightness.

The technical scheme of the utility model is that: a control circuit of a flash breathing lamp comprises a square wave generating unit, a driving control unit and a main circuit unit; the output end of the square wave generating unit is connected with the CLK end of the driving control unit and provides a square wave signal; the output end of the driving control unit is connected with the control end of the main circuit unit and used for controlling the time interval and the brightness of the lighting of the flickering breathing lamp.

The utility model discloses a theory of operation is: a non-gate oscillator in the square wave generating unit generates a square wave to control a driving control unit, and the core of the driving control unit is a CD4017 chip; CD4017 is a decimal counter/pulse distributor. CD4017 is a 5-bit Johnson counter, which has 10 decoding output ends, CP, CR and INH input ends, outputs output currents with different time intervals and different sizes through resistors with equal ratio series of connection resistance values at intervals of output ends Q0-Q8 of the CD4017, the currents are connected with the control end of a triode of a main circuit unit, and the time intervals and the brightness of LED flickering are lightened and controlled through the current amplification effect of the triode.

The utility model has the advantages that:

(1) the circuit does not need programming, and is simple to modify and debug;

(2) the flicker and the brightness change exist at the same time, so that the reminding and indicating functions are greatly increased;

(3) the clock signal is formed by the NOT gate self oscillator, and the structure is simple;

(4) the output end of the shift counter is connected with the resistors with the resistance values in an equal ratio array to form weak currents with different sizes, and then the LEDs are driven to emit light with different brightness through the current amplification effect of the triodes.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

FIG. 1 is a circuit diagram of a driving control unit composed of a CD4017 shift counter;

fig. 2 is an overall circuit diagram of a flashing breath lamp.

Description of reference numerals:

100-square wave generating unit;

200 — a drive control unit;

300 — main circuit unit.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

As shown in fig. 1, the core of the driving control unit of the present invention is a CD4017 shift counter, and the effect of "flash respiration" is realized by the resistor in an equal ratio series of connection resistances at the intervals between the output ports Q0-Q8. Because the resistance value is gradually reduced, the output current is gradually increased, and the light emitting diode is gradually lightened in one cycle; then entering the next cycle, restarting, gradually changing from darkest to brighter, and resembling the 'breathing' of a person; because of the connection of the output ports at intervals, the lighting intervals of the light-emitting diodes are different, and the effect of flickering appears. The utility model combines the two ingeniously together to form the twinkling breathing lamp.

The specific design mode is as follows: the output end Q0 is connected with a metal film resistor R2 with the resistance value of 16K, the output end Q1 is connected with a metal film resistor R3 with the resistance value of 8K, the output end Q3 is connected with a metal film resistor R4 with the resistance value of 4K, the output end Q6 is connected with a metal film resistor R5 with the resistance value of 2K, and the output end Q8 is connected with a metal film resistor R6 with the resistance value of 1K. A large number of experiments prove that the brightness presenting effect of the resistance in an equal ratio array is better than that of the resistance in an equal difference array. Therefore, the circuit uses a resistor with a resistance value in an equal ratio array. The diodes D1-D6 are 1N4148 in type, and the diodes are used for preventing energy from flowing back to the chips and burning the chips.

After the circuit is powered on, namely after the CP end of the CD4017 receives the rising edge of the first pulse, the Q0 outputs a high level, the high level is output through the resistor R2 and the diode D1, and since the resistance of the R2 is the largest, the output current of the circuit is the smallest.

After the rising edge of the 2 nd clock pulse is input, Q0 returns to the low level, Q1 outputs the high level, and the high level is output through a resistor R3 and a diode D3.

After the rising edge of the 3 rd clock pulse is input, Q0 and Q1 are both low level, Q2 outputs high level, and at this time, Q2 is floating, so that the Q2 does not flow into the subsequent circuits.

By analogy, in the 4 th pulse to the 8 th pulse, the corresponding output end is at a high level, the rest ports recover to a low level, and the corresponding high level flows out through the corresponding resistor and the corresponding diode (except for suspension).

After the 9 th pulse is input, the corresponding high level flows out through the resistor R6 and the diode D5. After the 10 th pulse is input, the high level output by the Q9 is connected to the CR end, so that the CD4017 is reset, and the Q0 outputs the high level again to form a new cycle.

As shown in fig. 2, the flash breathing lamp control circuit of the present invention comprises three units: a square wave generating unit 100, a drive control unit 200, and a main circuit unit 300.

The square wave forming unit 100 is composed of a non-gate oscillator, outputs a square wave, and is connected to a CP port of the driving control unit 200, and the specific principle is as follows: where NO is marked by two inverters, the left side is the input, the right side is the output, and the circle at the output represents "not". The present utility model adopts SN74AHC1G04 chip of Texas instrument.

Analyzing the oscillator circuit first requires assuming a state from which two alternately changing transients are gradually found. The voltage of the intersection point of the resistor and the capacitor is named as Vfb, namely, feedback voltage, the output is VCC or 0, the input threshold is VCC/2, the voltage of the capacitor is 0, the output of the NOT gate 1 (left side) is 0, the output of the NOT gate 2 (right side) is 1, the input end of the NOT gate is considered to be high-resistance input, the NOT gate 2 charges the capacitor through the resistor, the current direction is from right to left, and the voltage on the capacitor is corresponding to the zero state of a first-order inertia link. As the capacitor voltage gradually increases, Vfb gradually decreases until it is below the nor gate's threshold voltage VCC/2, the input to the nor gate 1 will be recognized as 0 and the output will be inverted to 1 and the output of the nor gate 2 inverted to 0. At the moment, the Vfb voltage is-VCC/2, then the NOT gate 1 charges the capacitor through the resistor, the current direction is from left to right, the capacitor voltage is changed from right positive left negative to left positive right negative, when the capacitor voltage exceeds VCC/2, the NOT gate 1 is inverted to output 0 again, the NOT gate 2 is inverted to output 1, and the NOT gate oscillates in a reciprocating manner. And the oscillator period formula is:

T≈(1.4～2.3)R1*C1

in addition, the core of the main circuit unit 300 is current amplification of a triode, which amplifies the minute current outputted from the driving control terminal to a current suitable for the operation of the light emitting diode LED1, thereby forming the effect of flickering the breathing lamp. The triode of the utility model adopts a 9014 model triode.

The utility model discloses multiple alternative has:

(1) selecting which output ports of the CD4017 chip are used according to the requirement of a flicker interval;

(2) to match the current requirements, the led may be connected in series with a current limiting resistor.

The above alternatives also belong to the scope of the present invention, and therefore, such modifications or improvements made on the basis of the spirit of the present invention all belong to the scope of the present invention.

Claims

1. A flash breath lamp control circuit comprises a square wave generating unit 100, a driving control unit 200 and a main circuit unit 300; the square wave generating unit is characterized in that the output end of the square wave generating unit is connected with the CLK end of the driving control unit and provides a square wave signal; the output end of the driving control unit is connected with the control end of the main circuit unit and used for controlling the time interval and the brightness of the lighting of the flickering breathing lamp.

2. The flash breath lamp control circuit of claim 1, wherein the square wave generating unit comprises a first not gate NO1, a second not gate NO2, a first resistor R1 and a first capacitor C1; the output end of the first not gate NO1 is connected with the input end of the second not gate NO2 and one end of the first resistor R1, and the input end of the first not gate NO1 is connected with the other end of the first resistor R1 and one end of the first capacitor C1; the other end of the first capacitor C1 is connected to the output of the second not gate NO2 and led out as the output of the square wave generating unit.

3. The flash breathing lamp control circuit of claim 2 wherein the first not gate and the second not gate employ texas instruments SN74AHC1G04 chips.

4. The control circuit of a flash breath lamp according to claim 1, wherein the driving control unit comprises a CD4017 model shift counter, second to sixth resistors R2 to R6, first to sixth diodes D1 to D6; the Q0 end of the shift counter is connected with the anode of a first diode D1 through a second resistor R2, the Q1 end is connected with the anode of a second diode D2 through a third resistor R3, the Q3 end is connected with the anode of a third diode D3 through a fourth resistor R4, the Q6 end is connected with the anode of a fourth diode D4 through a fifth resistor R5, and the Q8 end is connected with the anode of a fifth diode D5 through a sixth resistor R6; the end Q9 is connected with the anode of a sixth diode D6, and the cathode of the sixth diode is connected with the CR end of the displacement counter; cathodes of the first to fifth diodes D1 to D5 are connected and led out to be used as output ends of the drive control unit.

5. The flash breath lamp control circuit as recited in claim 4 wherein the second through sixth resistors R2-R6 are in an equal proportional series.

6. The control circuit of the flash breath lamp as stated in claim 1, wherein the main circuit unit comprises a first light emitting diode LED1, a first triode Q1, a power supply VCC; the power supply VCC is connected with the anode of the first light-emitting diode LED1, the cathode of the first light-emitting diode is connected with the collector of the first triode Q1, and the emitter of the first triode Q1 is grounded GND; the base of the first triode Q1 is connected to the output terminal of the drive control unit.

7. A control circuit of a flash breathing lamp as in claim 6, wherein the transistor is a 9014 model transistor.