CN2760896Y

CN2760896Y - Color changing mini night lamp

Info

Publication number: CN2760896Y
Application number: CN200420054125.4U
Authority: CN
Inventors: 吴海彬; 何开文; 张德文
Original assignee: CANGYUE ELECTRONIC ENTERPRISE Co Ltd FUINAN PROV
Current assignee: CANGYUE ELECTRONIC ENTERPRISE Co Ltd FUINAN PROV
Priority date: 2004-12-03
Filing date: 2004-12-03
Publication date: 2006-02-22
Anticipated expiration: 2014-12-03

Abstract

The utility model discloses a color-changing night light, which comprises a drive part for rectifying, filtering, and stabilizing an AC power supply into a DC power supply, a control chip controlled by a light control switch circuit, and various colors connected to the output end of the control chip. The light-emitting diode and the adjustment button connected to the adjustment input end of the control chip can adjust the color change and light-emitting brightness change of the light-emitting diode. It uses light-emitting diodes of various colors as the light source of the night light, and can control the on-off of the chip according to the brightness of the environment, and can also adjust the light-emitting diodes of different colors to emit light in a fixed color, sudden change or gradual change state according to the set program. It has the characteristics of convenient use, rich color changes of light-emitting diodes, simple circuit, strong decoration and fun.

Description

A kind of variable color mini light night

Technical field

The utility model relates to a kind of mini light night, and is especially a kind of with the variable color mini light night of light-emitting diode as light source.

Background technology

Traditional mini light night is general to use common miniature bulb, and direct incoming transport civil power by manually carrying out switch control, uses very inconveniently, and the color of light has only solid color, and is ornamental relatively poor.

Now existingly utilize the mini light night of light-emitting diode as light source because light-emitting diode has low-voltage driving, power saving, is difficult for characteristic such as fragmentation, with light-emitting diode as the light fixture of light source have antidetonation, power consumption few, do not generate heat and advantage such as environmental protection; Therefore light-emitting diode has been widely used in lighting and decorative lamp as a kind of new type light source.But existing light-emitting diode variable color mini light night generally can only use inconvenience, and need be furnished with dedicated control circuit by manually carrying out switch control, can only realize a kind of or a few colour switching effect, very flexible.

The utility model content

The purpose of this utility model provide a kind of can be according to ambient light illumination automatic switch and the simple variable color mini light night of control circuit.

The technical solution of the utility model is such: a kind of variable color mini light night, comprise drive part, control section and the Lights section, and the input of above-mentioned drive part can directly connect electric main, and its output connects the power input of above-mentioned control section; Above-mentioned control section comprises control chip and is connected in the light-controlled switching circuit of control chip control input end so that when ambient light illumination control chip work during less than set point, when ambient light illumination during greater than set point control chip do not work; Above-mentioned the Lights section is versicolor light-emitting diode, and this versicolor light-emitting diode is connected to each output of above-mentioned control chip; The adjustment input of above-mentioned control chip is connected with the adjustment button, is used to make above-mentioned versicolor light-emitting diode to carry out colour switching adjustment and luminosity adjustment according to the program that writes above-mentioned control chip in advance.

Above-mentioned drive part comprises step-down rectifier, filtering and the loop of voltage regulation that is connected successively, thereby provides the DC voltage-stabilizing working power for above-mentioned control section.

Above-mentioned light-controlled switching circuit comprises triode and light-dependent control element, the base stage of this triode connects the output of above-mentioned drive part by resistance, be connected above-mentioned light-dependent control element between the base stage of this triode and the ground, the collector electrode of this triode connects the control input end of above-mentioned control chip, the grounded emitter of this triode.

Above-mentioned light-dependent control element is photo resistance.

Above-mentioned versicolor light-emitting diode is located in the same Transparent lamp shade.

The utility model utilizes the light source of light-emitting diode as mini light night, and its be provided with can be according to the light-controlled switching circuit of ambient brightness auto switching control chip, also be provided with can make different colours light-emitting diode according to the luminous adjustment button of setting program.Drive part of the present utility model is connected with AC power, is connected with the triode of photo resistance to base stage by drive part output constant voltage dc source.When ambient light illumination was higher than set point, the bright resistance of photo resistance was less, and the base voltage of triode is less than its cut-in voltage, and triode switch ends, and control chip is in sleep state, and light-emitting diode does not work; When ambient light illumination is lower than set point, it is big that the resistance of photo resistance becomes, the base voltage of triode is greater than its cut-in voltage, the triode conducting, control chip is started working, according to the light-emitting diode of setting program output corresponding signal to respective color, make the light-emitting diode of respective color shinny, use easily.In the time will adjusting the mini light night turn colors, push the adjustment button according to the setting pattern, just the change color that can versicolor light-emitting diode be enriched increases ornamental and interesting.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Embodiment

The utility model relates to a kind of variable color mini light night, as shown in Figure 1, AC power inserts resistance R 1 and the capacitor C 1 that is in parallel, insert again by diode D1, D2, the rectifier bridge that D3 and D4 form, rectifier bridge output negative pole ground connection, rectifier bridge output cathode series resistor R2, the other end of resistance R 2 connects the positive terminal of filter capacitor C2 respectively, the negative pole end of voltage-stabiliser tube D6, one end of resistance R 8, one end of resistance R 4, one end of resistance R 3 and the power end of control chip U1, the positive terminal ground connection of the negative pole end of filter capacitor C2 and voltage-stabiliser tube D6, the other end of resistance R 8 connects the end of adjustment button KEY1 and the adjustment input of control chip U1 respectively, adjust the other end ground connection of button KEY1, the other end of resistance R 4 connects the base stage of triode Q1 (NPN) and the end of photo resistance RG respectively, the other end ground connection of photo resistance RG, the collector electrode of triode Q1 connects the control input end of the other end and the control chip U1 (pic12 series) of resistance R 3 respectively, the grounded emitter of triode Q1, three outputs of control chip U1 are respectively by resistance R 5, R6, R7 connects red, green, the light-emitting diode RLED of blue three-color, GLED, the positive pole of BLED, light-emitting diode RLED, GLED, the minus earth of BLED.

During the utility model work, AC power is carried out step-down by capacitor C 1 and resistance R 1, is rectified into direct current through rectifier bridge again, passes through filtering capacitor C 2 elimination clutters again, again through voltage-stabiliser tube D6 voltage stabilizing, obtains the DC power supply of voltage stabilizing.This constant voltage dc source inserts base stage and the photo resistance of triode Q1 through resistance R 4; When ambient brightness during greater than set point, the bright resistance of photo resistance RG is less, and the base voltage of triode Q1 is less than its cut-in voltage, and triode Q1 ends, and control chip U1 is in sleep state, and light-emitting diode does not work; When ambient brightness during less than set point, it is big that the resistance of photo resistance RG becomes, and the base voltage of triode Q1 is greater than its cut-in voltage, triode Q1 conducting, control chip Q1 is waken up, and the signal that output is set is to the light-emitting diode of respective color, and the light-emitting diode of respective color is just shinny.If when wanting the color of conversion mini light night, only need to push adjustment button KEY1 by the setting pattern, signal is adjusted in input to control chip Q1, just can make control chip export the light-emitting diode of corresponding signal to respective color, thereby color that obtains setting and brightness change.Color control of the present utility model both can realize red, green, blue and combined color checker thereof, can also realize the gradual change of red, green, blue light-emitting diode luminance.After control chip is waken up from sleep state, can keep with enter the sleep before the same colour switching pattern of light-emitting diode.The gradual change of led color is to realize that by the pwm signal of program output duty cycle gradual change on each output of control chip the duty ratio gradual change realizes by the control chip timer.

The used control chip U1 maximum of the utility model can have the driving force of 25mA, therefore, light-emitting diode RLED, GLED, BLED can directly link to each other with the output of control chip U1 with R7 by current-limiting resistance R5, R6 respectively, also can control by triode switch respectively between current-limiting resistance R5, R6 and R7 and light-emitting diode RLED, GLED, the BLED.

In sum, the utility model can be according to the ambient brightness automatic control switch, use easily, and the utility model comes direct driven for emitting lights diode by the pic single-chip microcomputer as control chip, circuit structure is than the colour switching mode diversification of simple and light-emitting diode, and is ornamental stronger with interest.

Claims

1. A color-changing night light, comprising a driving part, a control part and a light source part, characterized in that: the input end of the above-mentioned driving part can be directly connected to the AC mains, and its output end is connected to the power input end of the above-mentioned control part; the above-mentioned control part It includes a control chip and a light control switch circuit connected to the control input of the control chip, so that the control chip works when the ambient illuminance is less than the set value, and the control chip does not work when the ambient illuminance is greater than the set value; the above-mentioned light sources are in various colors The light-emitting diodes of various colors are respectively connected to the output terminals of the above-mentioned control chip; the adjustment input terminals of the above-mentioned control chip are connected with adjustment buttons, which are used to make the light-emitting diodes of the above-mentioned various colors follow the pre-written control The program of the chip performs color transformation adjustment and luminous brightness adjustment.

2. A color-changing night light according to claim 1, characterized in that: the driving part includes step-down rectification, filtering and voltage stabilizing circuits connected in sequence, so as to provide DC regulated working power for the control part.

3. A color-changing night light according to claim 1, characterized in that: the light control switch circuit includes a triode and a light control element, the base of the triode is connected to the output end of the driving part through a resistor, the base of the triode The light control element is connected between the electrode and the ground, the collector of the triode is connected to the control input terminal of the control chip, and the emitter of the triode is grounded.

4. A color-changing night light according to claim 3, characterized in that the light control element is a photoresistor.

5. A color-changing night light according to claim 1, characterized in that the light-emitting diodes of various colors are arranged in the same transparent lampshade.

6. A color-changing night light according to claim 1, characterized in that the LEDs of various colors are connected to the output terminal of the control chip through a current-limiting resistor.

7. A color-changing night light according to claim 1, characterized in that the above-mentioned control chip is a pic12 series single-chip microcomputer.

8. A color-changing night light according to claim 1, characterized in that: after the control chip is woken up, it can still work according to the last setting mode.

9. A color-changing night light according to claim 7, characterized in that: the color gradient of the light-emitting diodes of various colors is realized by sending a PWM driving signal at the output terminal of the control chip through the control of the timer of the single-chip microcomputer.