CN210868258U

CN210868258U - NE555 chip-based light sensation adjusting circuit

Info

Publication number: CN210868258U
Application number: CN201921476042.7U
Authority: CN
Inventors: 张叶茂; 梁林德; 莫淑贤; 刘红艳; 王永宁; 谭卫东
Original assignee: Nanning College for Vocational Technology
Current assignee: Nanning College for Vocational Technology
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2020-06-26
Anticipated expiration: 2029-09-06

Abstract

The utility model discloses a light sense regulating circuit based on NE555 chip, it is including the unsteady state multivibrator circuit that is used for exporting the PWM signal and be used for receiving the PWM signal and according to the power control circuit of signal control power break-make, wherein, unsteady state multivibrator circuit includes the NE555 chip, the charge-discharge circuit who is coupled with the NE555 chip and couple the photo resistance RG between power and charge-discharge circuit. The utility model utilizes the characteristic of NE555 to be used as an astable multivibrator in the circuit to generate PWM signals for dimming; and is coupled to a control circuit for receiving the PWM signal and controlling the switching of the lamp.

Description

NE555 chip-based light sensation adjusting circuit

Technical Field

The utility model relates to a light sense regulating circuit based on NE555 chip.

Background

The lamp is the most common lighting appliance in daily life, and the lighting function of the lamp brings convenience to the life of people. The existing light-operated lamp is widely used, can be turned on and off according to the intensity of ambient light, and can achieve the purpose of energy saving, but sometimes when the light-operated lamp works in a weak light environment, the lamp needs to be turned on but does not need to work at rated power, and the requirement of the environment can be met only by half of brightness.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the above-mentioned defect among the prior art, provide a structure succinct, can adjust the light sense regulating circuit based on NE555 chip of the luminance of lamp according to the illumination environment.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme: the light sensation adjusting circuit based on the NE555 chip comprises an astable multivibrator circuit used for outputting PWM signals and a power supply control circuit used for receiving the PWM signals and controlling the on-off of a power supply according to the signals, wherein the astable multivibrator circuit comprises the NE555 chip, a charging and discharging circuit coupled with the NE555 chip and a photoresistor RG coupled between the power supply and the charging and discharging circuit.

Furthermore, the utility model discloses still provide following subsidiary technical scheme:

the charging and discharging circuit comprises a potentiometer RP1, a diode D1, a resistor R1 and a capacitor C1, wherein the head end of the potentiometer RP1 is coupled with a photosensitive resistor RG, the center end of the potentiometer RP1 is respectively coupled with the 7 th pin of the NE555 chip and the anode of the diode D1, the tail end of the potentiometer RP1 is respectively coupled with the cathode of the diode D1 and one end of the resistor R1, the anode of the capacitor C1 is respectively coupled with the other end of the resistor R1 and the 2 nd and 6 th pins of the NE555 chip, and the cathode of the capacitor C1 is grounded.

The light sensitive resistor RG is model MG 42-17.

The model of the diode D1 is 1N 4007.

The capacitor C1 is an electrolytic capacitor with a capacitance value of 0.01 μ F.

The astable multivibrator circuit further comprises a capacitor C2, wherein the anode of the capacitor C2 is coupled with the 5 th pin of the NE555 chip, and the cathode of the capacitor C2 is grounded.

The capacitor C2 is an electrolytic capacitor with a capacitance value of 0.01 μ F.

The control circuit comprises resistors R2, R3, R4, R5, R6 and a transistor Q1, an optocoupler U2, a triac U3, and a capacitor C3, wherein one end of a resistor R2 is coupled to pin 3 of NE555, the other end is coupled to a base of a transistor Q1, a collector of the transistor Q1 is coupled to a power supply, an emitter is coupled to one end of a resistor R3, the other end of the resistor R3 is coupled to an emitter anode of the optocoupler U2, a cathode of the photoreceptor is grounded, a collector of the optocoupler U2 is coupled to one end of a resistor R4, an emitter is coupled to one end of a resistor R5 and a control electrode of the triac U3, the other ends of resistors R4 and R5 are coupled to a first electrode and a second electrode of the triac U3, one end of the capacitor C3 is coupled to a first electrode of the triac U3, the other end is coupled to one end of the resistor R6, and the other end of the resistor R6 is coupled to a first electrode of the triac U3.

The optocoupler U2 is model PC 817B.

The type of the bidirectional triode thyristor U3 is BAT 41-600B.

Compared with the prior art, the utility model has the advantages that: the utility model utilizes the characteristic of NE555 to be used as an astable multivibrator in the circuit to generate PWM signals for dimming; and is coupled to a control circuit for receiving the PWM signal and controlling the switching of the lamp.

Drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description only relate to some embodiments of the present invention and are not limiting to the present invention.

Fig. 1 is a circuit schematic diagram of a light sensation adjusting circuit based on NE 555.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the following detailed description of the present invention, taken in conjunction with the accompanying drawings and the detailed description, is given in a non-limiting manner.

As shown in fig. 1, the light sensation adjusting circuit based on the NE555 chip of the present embodiment includes: the power supply circuit comprises an astable multivibrator circuit and a power supply control circuit, wherein the astable multivibrator circuit and the power supply control circuit are mutually coupled, the astable multivibrator circuit is used for outputting PWM signals, and the power supply control circuit is used for receiving the PWM signals and controlling the on-off of a power supply according to the signals. The astable multivibrator circuit has a light sensation adjusting function and can output PWM signals only under the condition of adjusting the light sensation within a specific range.

The astable multivibrator circuit comprises an NE555 chip U1, a charging and discharging circuit, a photoresistor RG and a capacitor C2, wherein the charging and discharging circuit comprises a potentiometer RP1, a diode D1, a resistor R1 and a capacitor C1. The 4 th pin and the 8 th pin of the NE 555U 1 and one end of a photoresistor RG are coupled with a power supply, the other end of the photoresistor is coupled with the head end of a potentiometer RP1, the center end of the potentiometer RP1 is coupled with the 7 th pin of the NE555 chip and the anode of a diode D1 respectively, the tail end of the potentiometer RP1 is coupled with the cathode of the diode D1 and one end of a resistor R1 respectively, the anode of a capacitor C1 is coupled with the other end of the resistor R1 and the 2 nd and 6 th pins of the NE555 chip respectively, and the cathode of the capacitor C1 is grounded. The positive pole of the capacitor C2 is coupled with the 5 th pin of the NE555 chip, and the negative pole is grounded. The output duty cycle of pin 3 of the NE555 chip U1 can be adjusted using RP1, with higher duty cycle meaning higher bulb brightness and lower duty cycle meaning lower lamp brightness. When the circuit works, the light-sensitive resistor RG in the astable multivibrator circuit senses the illumination intensity in the environment, and adjusts the charges passing through the upper half parts of the R1 and the RP1 and the capacitor C1 according to the illumination intensity, so that the output end of the U1 of the NE555 chip outputs different pulse electric signals. In this embodiment, the photosensitive resistor RG1 is MG42-17, the diode D1 is 1N4007, the potentiometer RP1 is a 103-type potentiometer, the resistor R1 has a resistance of 1K, the capacitors C1 and C2 are electrolytic capacitors, and the capacitance values are 0.01 μ F, respectively.

The power supply control circuit comprises a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a transistor Q1, an optical coupler U2, a bidirectional thyristor U3 and a capacitor C3. One end of a resistor R2 is coupled to the 3 rd pin of the NE555, the other end of the resistor R2 is coupled to the base of a transistor Q1, the collector of a transistor Q1 is coupled to the power supply, the emitter of the transistor R3 is coupled to one end of a resistor R3, the other end of the resistor R3 is coupled to the light emitter of the optocoupler U2, the other end of the light receiver is grounded, one end of the light receiver of the optocoupler U2 is coupled to one end of the resistor R4, the other end of the light receiver is coupled to one end of a resistor R5 and the control electrode of the triac U3, the other ends of the resistors R4 and R5 are respectively coupled to the first electrode and the second electrode of the triac U3, and the RC. The capacitor C3 and the resistor R6 form an RC capacitance-resistance absorption circuit. The transistor Q1 is used as a pre-driver and controls a household lighting lamp with 220V alternating current by low voltage; the optical coupler U2 is used for driving the bidirectional thyristor U3 and plays a role in isolation; r4 is a trigger current-limiting resistor, R5 is a BCR gate resistor, false triggering is prevented, and the anti-interference capability is improved; the RC resistance-capacitance absorption circuit can realize overvoltage protection on the bidirectional controllable silicon. The control circuit works according to a pulse signal output by the astable multivibrator, if the transistor Q1 receives a negative pulse electric signal, the transistor Q1 is in a cut-off state, the light emitter of the optical coupler U2 cannot be triggered, the bidirectional triode thyristor U3 works in the cut-off state, and the lamp is not on; if the transistor Q1 receives the positive pulse electric signal to be conducted, the optical coupler U2 light emitter is triggered, the bidirectional triode thyristor U3 is conducted to be connected with a circuit, and the lamp is turned on. In this embodiment, the transistor Q1 is an 8050 type triode, the optocoupler U2 is in the model of PC817B, the triac U3 is in the model of BAT41-600B, the resistance of the resistor R2 is 1K, the resistance of the resistor R3 is 270 Ω, the resistances of the resistor R4 and the resistor R5 are 51 Ω, the resistance of the resistor R5 is 100 Ω, the resistance of the resistor R6 is 47 Ω, and the capacitor C3 is a 103 type capacitor.

The utility model discloses a theory of operation is: the photoresistor RG senses the illumination intensity in the current environment, when the real-time environment illumination is strong, the photoresistor RG adjusts the charges passing through the upper half parts of the R1 and the RP1 and the capacitor C1, when the voltage at the two ends of the capacitor C1 reaches 2/3 of VCC, the output of the internal upper comparator is turned over, the internal trigger switches the output result, the output end of the astable multivibrator becomes a negative pulse electric signal, the transistor Q1 is in a cut-off state and cannot enable the optocoupler U2 to be triggered in an optocoupler mode, the bidirectional thyristor U3 works in a cut-off state, and the lamp is not bright. When real-time ambient lighting is weak, the lower half of RP1 flows into the discharge pin when the capacitor begins to discharge because the internal flip-flop is set to now current through R1. When the voltage across capacitor C1 becomes 1/3 at VCC, the lower comparator flips its output, which in turn causes the internal flip-flop to switch its output again. This causes the astable multivibrator to output a positive pulse electrical signal, at this time, Q1 is turned on to trigger the yellow coupler U2 with an opto-coupler, which turns on the triac U3 to turn on the circuit, and the lamp is lit.

It should be noted that the above-mentioned preferred embodiments are only for illustrating the technical concepts and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention accordingly, and the protection scope of the present invention cannot be limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a light sense regulating circuit based on NE555 chip which characterized in that: the PWM power supply circuit comprises an astable multivibrator circuit used for outputting a PWM signal and a power supply control circuit used for receiving the PWM signal and controlling the on-off of a power supply according to the signal, wherein the astable multivibrator circuit comprises an NE555 chip, a charging and discharging circuit coupled with the NE555 chip and a photoresistor RG coupled between the power supply and the charging and discharging circuit.

2. A light sensation adjusting circuit based on an NE555 chip as claimed in claim 1, wherein: the charging and discharging circuit comprises a potentiometer RP1, a diode D1, a resistor R1 and a capacitor C1, wherein the head end of the potentiometer RP1 is coupled with a photosensitive resistor RG, the center end of the potentiometer RP1 is respectively coupled with the 7 th pin of an NE555 chip and the anode of a diode D1, the tail end of the potentiometer RP1 is respectively coupled with the cathode of a diode D1 and one end of a resistor R1, the anode of the capacitor C1 is respectively coupled with the other end of a resistor R1 and the 2 nd and 6 th pins of the NE555 chip, and the cathode of the capacitor C1 is grounded.

3. A light sensation adjusting circuit based on an NE555 chip as claimed in claim 1 or 2, wherein: the type of the light-sensitive resistor RG is MG 42-17.

4. A light sensation adjusting circuit based on an NE555 chip as claimed in claim 2, wherein: the model of the diode D1 is 1N 4007.

5. A light sensation adjusting circuit based on an NE555 chip as claimed in claim 2, wherein: the capacitor C1 is an electrolytic capacitor with a capacitance value of 0.01 muF.

6. A light sensation adjusting circuit based on an NE555 chip as claimed in claim 1, wherein: the astable multivibrator circuit further comprises a capacitor C2, wherein the anode of the capacitor C2 is coupled with the 5 th pin of the NE555 chip, and the cathode of the capacitor C2 is grounded.

7. A light sensation regulation circuit based on NE555 chip of claim 6, wherein: the capacitor C2 is an electrolytic capacitor with a capacitance value of 0.01 muF.

8. A light sensation adjusting circuit based on an NE555 chip as claimed in claim 1, wherein: the control circuit comprises resistors R2, R3, R4, R5, R6, a transistor Q1, an optical coupler U2, a bidirectional thyristor U3 and a capacitor C3, one end of the resistor R2 is coupled to pin 3 of NE555, the other end is coupled to the base of the transistor Q1, the collector of the transistor Q1 is coupled to the power supply, the emitter is coupled to one end of the resistor R3, the other end of the resistor R3 is coupled to the anode of the light emitter of the optocoupler U2, the cathode of the light emitter is grounded, the collector of the optocoupler U2 is coupled to one end of the resistor R4, the emitter is coupled to one end of the resistor R5 and the control electrode of the triac U3, the other ends of the resistors R4 and R5 are coupled to the first electrode and the second electrode of the triac U3, one end of the capacitor C3 is coupled to the first electrode of the triac U3, the other end is coupled to one end of the resistor R6, and the other end of the resistor R6 is coupled to the first electrode of the triac U3.

9. A light and light sensation adjusting circuit based on an NE555 chip as claimed in claim 8, wherein: the optocoupler U2 is of type PC 817B.

10. A light and light sensation adjusting circuit based on an NE555 chip as claimed in claim 8, wherein: the type of the bidirectional triode thyristor U3 is BAT 41-600B.