CN201733482U - LED ceiling lamp capable of realizing mechanical dimming - Google Patents

In technique scheme, described dim signal module comprises

resistance R

1 and R2, rectification diode D1 and D2, zener diode D3,

capacitor C

3 and C2,

resistance R

1, rectification diode D1 and

capacitor C

3 form one with the alternating current step-down, rectification and filtering obtain the electrical connection of direct voltage,

resistance R

2 and zener diode D3 form an electrical connection that described direct voltage is obtained once more a 5V burning voltage after step-down and the voltage stabilizing, 5V burning voltage one tunnel is connected the VDD of the single-chip microcomputer U1 in the dimming controlling module through rectification diode D2 with

capacitor C

2, another road of 5V burning voltage connects the GP1 of the single-chip microcomputer U1 in dimming controlling module.

Described dimming controlling module comprises single-chip microcomputer U1, photoelectrical coupler U2,

resistance R

3 and light modulation triode Q1, the input of photoelectrical coupler U2 connects the GP0 of single-chip microcomputer U1, another input connects the dim signal module, the output of photoelectrical coupler U2 connects

resistance R

3, another output connects light modulation triode Q1, light modulation triode Q1, more than one LED lamp, rectifying and voltage-stabilizing module output link together in regular turn, and

resistance R

3 other ends connect rectifying and voltage-stabilizing module output.

Embodiment

1, referring to Fig. 1, the described LED Ceiling light that can realize the mechanical type light modulation of present embodiment, comprise switch, rectifying and voltage-stabilizing

module

1 and more than one

LED lamp

4, present embodiment also comprises

dim signal module

2 and dimming controlling

module

3,

dim signal module

2 electrically connects dimming controlling

module

3, rectifying and voltage-stabilizing

module

1 and

dim signal module

2 form with switch and are electrically connected, dimming controlling

module

3 and rectifying and voltage-stabilizing

module

1 form with more than one

LED lamp

4 and are electrically connected, in Fig. 1, only drawn the light-emitting diode of three LED lamps 4.Described

dim signal module

2 comprises

resistance R

1 and R2, rectification diode D1 and D2, zener diode D3,

capacitor C

3 and C2,

resistance R

1, rectification diode D1 and

capacitor C

3 form one with the alternating current step-down, rectification and filtering obtain the electrical connection of direct voltage,

resistance R

2 and zener diode D3 form an electrical connection that described direct voltage is obtained once more a 5V burning voltage after step-down and the voltage stabilizing, 5V burning voltage one tunnel is connected the VDD of the single-chip microcomputer U1 in the dimming controlling

module

3 through rectification diode D2 with

capacitor C

2, another road of 5V burning voltage connects the GP1 of the single-chip microcomputer U1 in dimming controlling module 3.Described dimming controlling

module

3 comprises single-chip microcomputer U1, photoelectrical coupler U2,

resistance R

3 and light modulation triode Q1, the input of photoelectrical coupler U2 connects the GP0 of single-chip microcomputer U1, another input connects

dim signal module

2, the output of photoelectrical coupler U2 connects

resistance R

3, another output connects light modulation triode Q1, light modulation triode Q1, more than one

LED lamp

4, rectifying and voltage-stabilizing

module

1 output link together in regular turn, and

resistance R

3 other ends connect rectifying and voltage-stabilizing

module

1 output.

Referring to Fig. 1 and Fig. 2, the LED Ceiling light that present embodiment is described can realize the mechanical type light modulation closes a switch (turning on light) in use for the first time, lamp in 3 seconds its brightness from shadow to the brightest.After lamp was opened, the 220V alternating current was through

resistance R

1 step-down, through rectification diode D1 rectification, obtain a direct voltage through

capacitor C

3 filtering; Described direct voltage obtains a 5V burning voltage through

resistance R

2 step-down once more, after zener diode D3 voltage stabilizing; This 5V burning voltage one tunnel is isolated and

capacitor C

2 energy storage through rectification diode D2, resupplies single-chip microcomputer U1 work, allows single-chip microcomputer U1 work 6 seconds above (model of single-chip microcomputer U1 can be PIC10F202) under the situation that

capacitor C

2 can externally be cut off the power supply.The GP1 that single-chip microcomputer U1 is led on another road of described 5V burning voltage detects (being the 5V high level under the normal condition) as dim signal, dimming control signal of the GP0 of single-chip microcomputer U1 output is controlled light modulation triode Q1 through photoelectrical coupler

U2 LED lamp

4 is carried out light modulation (effect of photoelectrical coupler U2 is to make

LED lamp

4 and main mains isolation, and

resistance R

3 is power supply current-limiting resistances of photoelectrical coupler U2).Detection have or not switch press (opening time≤1.5S), do not remain on the brightest state there being switch to press when action lamp.When the needs light modulation, carry out following operation: after lamp is opened, (promptly open a pass one by a disconnected switch, the time of opening again behind the pass is less than or equals 1.5 seconds), lamp is extremely the darkest from existing brightness gradual change, progressive formation be 5 seconds (light from the brightest adjust to the darkest, 5S finishes the light modulation process), in progressive formation as will confirm current brightness, by disconnected switch, lamp will keep current brightness, and (detection has or not switch to press, opening time≤1.5S again, when pressing disconnected switch, just finish the light modulation operation, lamp keeps existing luminance state, finishes the light modulation process).As not according to disconnected switch, lamp remains on the brightest state.In the time will turning off the light, as long as switch is pressed the position of pass.

After lamp is opened, single-chip microcomputer U1 starts working, (time is less than or equal to 1.5 seconds) is because the capacity of

capacitor C

3 is very little when the user is closed one time by disconnection, the very fast disappearance of voltage, voltage on the GP1 of single-chip microcomputer U1 becomes low level by the 5V high level at once, but owing to the energy storage of unidirectional conducting of rectification diode D2 and

capacitor C

2 on the loop of giving single-chip microcomputer U1 power supply, single-chip microcomputer U1 will work on.Single-chip microcomputer U1 just can discern switching signal for the first time, and as the commencing signal of light modulation, when connecting in 1.5 seconds civil power later, when the GP1 of single-chip microcomputer U1 becomes the 5V high level by 0V, the GP0 of single-chip microcomputer U1 begins to export dim signal through photoelectrical coupler U2 control light modulation triode Q1 light modulation, in the process of brightness by bright deepening of lamp, (promptly open a pass one by disconnecting the pass once more, the time of opening again behind the pass is less than or equals 1.5 seconds), occur one on the GP1 of single-chip microcomputer U1 once more and become the potential change that 0V becomes 5V again by 5V, single-chip microcomputer U1 can discern in the same old way, after single-chip microcomputer U1 is identified as second control signal, the GP0 of single-chip microcomputer U1 will latch current control, also just preserve the luminance state when headlight.