CN201742598U - LED lamp automatically turned off after time delay - Google Patents

Abstract

The utility model discloses an LED lamp automatically turned off after time delay, which comprises a filter rectifier circuit (1), an on-off control circuit (2), a pulse transformer (T), a constant-current drive circuit (3), and LED lamp string, a microprocessor (N3), a fourth rectifier diode (D4), a filter resistor (R4) and a fourth filter capacitor (C7). The trigger end (CK) of the microprocessor is connected with the negative pole of the fourth rectifier diode (D4); the first output end (O1) of the microprocessor is connected with the enabling end (EN) of a pulse width controller (N1); the second output end (PWM) of the microprocessor is connected with the dimming end (DIM) of the pulse width controller; and the feedback end (FB) of the pulse width controller is connected with a triode (QP1) in an optical coupler. The microprocessor is programmed, so that the LED lamp works under a full-power state when the microprocessor is connected with an alternating-current power supply at the input end of the power supply, the alternating-current power supply is turned on and off once, and an LED becomes dark gradually and is turned off finally.

Description

The LED lamp that can close automatically after time of delay

Technical field

The utility model relates to a kind of structure of LED lamp, a kind of LED lamp that can close automatically after time of delay.

Background technology

Because incandescent lamp has shortcomings such as energy consumption height, life-span weak point, all there are the relevant policies of superseded incandescent lamp countries in the world.The LED light fixture has energy-conservation, as to subtract carbon advantage, is new illuminating product of future generation.Illuminating LED lamp generally comprises power unit and one group of LED lamp string of being made up of filter rectifier, ON-OFF control circuit, pulse transformer and constant-current drive circuit.This class LED lamp function of not turning off the light automatically.

Summary of the invention

The utility model is intended to propose a kind of structure of the LED lamp that can close automatically after time of delay.

This LED lamp that can close automatically after time of delay comprises filter rectifier, ON-OFF control circuit, pulse transformer, constant-current drive circuit and LED lamp string.Described filter rectifier comprises filter, rectifier, first filter capacitor, and ON-OFF control circuit comprises pulse width controller, field effect transistor, second rectifier diode and second filter capacitor.Pulse transformer comprises primary coil, secondary coil and first ancillary coil.Constant-current drive circuit comprises constant-current controller, optical coupler, the 3rd rectifier diode, the 3rd filter capacitor, divider resistance and sample resistance.This LED lamp that can close automatically after time of delay also comprises microprocessor, the 4th rectifier diode, filter resistance and the 4th filter capacitor.One group of second ancillary coil arranged on the described pulse transformer, one end of second ancillary coil and the positive pole of the 4th rectifier diode join, the negative pole of the 4th rectifier diode joins by the positive pole of filter resistance and the 4th filter capacitor, and the negative pole of the other end of second ancillary coil and the 4th filter capacitor joins.The positive pole of the power end of microprocessor and the 4th filter capacitor joins, and the negative pole of the trigger end of microprocessor and the 4th rectifier diode joins.First output of microprocessor and the Enable Pin of pulse width controller are joined, and second output of microprocessor and the light modulation end of pulse width controller join, and the feedback end of pulse width controller and the collector electrode of the triode in the optical coupler join.

Microprocessor in this LED lamp that can cut out automatically after time of delay programmes, second output output duty cycle when power connection that makes it is 100% pulse, the output pulse of second output is changed into duty ratio and is successively decreased gradually after trigger end receives a trigger impulse, and timing, when finishing to timing, undersuing of first output output.The pulse signal of above-mentioned first output and second output offers pulse width controller, finishes brilliance control.Because the 4th filter capacitor can make microprocessor keep one period operating time when power supply disconnects, after the input of the power supply of this LED lamp that close automatically after can time of delay and AC power connection, the LED lamp will be operated in full power state, AC power close-is opened once, the input of microprocessor is triggered once, the pulse duty factor of second output output is successively decreased and timing gradually, when finishing to timing, undersuing of first output output is to the Enable Pin of pulse width controller, the output signal that makes pulse width controller is zero, and the LED lamp is closed.

Description of drawings

Fig. 1 is the schematic diagram of existing LED lamp;

Fig. 2 be the utility model proposes can time of delay after the schematic diagram of the LED lamp that close automatically.

Embodiment

As shown in Figure 1, existing illuminating LED lamp generally comprises power unit and the one group of LED lamp string LED0 that is made up of filter rectifier 1, ON-OFF control circuit 2, pulse transformer T, constant-current drive circuit 3.This circuit is the led driver of a typical inverse-excitation type isolation structure.Wherein filter rectifier 1 comprises filter N0, rectifier DB1, the first filter capacitor C1.ON-OFF control circuit 2 comprises pulse width controller N1, field effect transistor Q1, the second rectifier diode D2 and the second filter capacitor C3.Pulse transformer T comprises primary coil L1, secondary coil L2 and the first ancillary coil L3.Constant-current drive circuit 3 comprises constant-current controller N2, the 3rd rectifier diode D3, the 3rd filter capacitor C5, divider resistance R10 and sample resistance R11.The input of filter N0 joins by a K switch and AC power, and the ac input end of the output of filter and rectifier DB1 joins.The first filter capacitor C1 is connected between the positive output end and negative output terminal of rectifier.The end of the primary coil L1 of the positive output end of rectifier and pulse transformer joins.The negative output terminal of rectifier by field effect transistor Q1 source electrode and the other end of the primary coil L1 of drain electrode and pulse transformer join.The control end DIV of pulse width controller N1 links to each other with the grid of field effect transistor Q1, the opening and closing of control field effect transistor, thus in L1, produce a dither electric current, through pulse transformer T coupling, in secondary coil L2, obtain corresponding pulse voltage.The positive pole of the output of secondary coil L2 and the 3rd rectifier diode D3 joins, the negative pole of the 3rd rectifier diode D3 is received the anode of LED lamp string LED0, the 3rd filter capacitor C5 is connected between another output of the negative pole of the 3rd rectifier diode D3 and secondary coil L2, and another output of the negative terminal of LED0 and secondary coil L2 joins.Pulse voltage among secondary coil L2 output dc voltage after D3 rectification, C5 filtering is given LED0.Divider resistance R10 and the two ends of receiving LED0 after sample resistance R11 connects.Divider resistance R10 links to each other with the signal input part of constant-current controller N2 with the tie point of sample resistance R11.The output of constant-current controller N2 is connected to a diode QP2 in the optical coupler, is connected to a triode QP1 in the optical coupler on the light modulation end DIM of pulse width controller N1.The variation of the voltage on the LED0 (electric current) feeds back to pulse width controller N1 by sample resistance R11, constant-current controller N2 and optical coupler QP1, QP2, adjusts the duty ratio of the conduction and cut-off of field effect transistor.Pulse width controller N1 is by the first ancillary coil L3 supply of electrical energy.Diode D1 is a fly-wheel diode among the figure, when field effect transistor Q1 ends, by D1 the energy of inductance winding is discharged to load.

This LED lamp that can close automatically after time of delay that the utility model proposes is to have increased a microprocessor N3 on circuit shown in Figure 1, and its principle as shown in Figure 2.This LED lamp that can close automatically after time of delay comprises filter rectifier 1, ON-OFF control circuit 2, pulse transformer T, constant-current drive circuit 3 and LED lamp string LED0.Described filter rectifier comprises filter N0, rectifier DB1, the first filter capacitor C1.ON-OFF control circuit comprises pulse width controller N1, field effect transistor Q1, the second rectifier diode D2 and the second filter capacitor C3.Pulse transformer comprises primary coil L1, secondary coil L2 and the first ancillary coil L3.Constant-current drive circuit comprises constant-current controller N2, optical coupler QP1, QP2, the 3rd rectifier diode D3, the 3rd filter capacitor C5, divider resistance R10 and sample resistance R11.This LED lamp that can close automatically after time of delay also comprises microprocessor N3, the 4th rectifier diode D4, filter resistance R4 and the 4th filter capacitor C7.Pulse transformer T goes up also has one group of second ancillary coil L4, one end of second ancillary coil and the positive pole of the 4th rectifier diode D4 join, the negative pole of the 4th rectifier diode joins by the positive pole of filter resistance R4 and the 4th filter capacitor C7, and the negative pole of the other end of second ancillary coil and the 4th filter capacitor C7 joins.The power end VCC of microprocessor N3 and the positive pole of the 4th filter capacitor C7 join, and the trigger end CK of microprocessor and the negative pole of the 4th rectifier diode D4 join.First output O1 of microprocessor and the Enable Pin EN of pulse width controller N1 join, and second output PWM of microprocessor and the light modulation end DIM of pulse width controller N1 join.The feedback end FB of pulse width controller N1 and the collector electrode of the triode QP1 in the optical coupler join the grounded emitter of QP1.C6 also is a filter capacitor among the figure, and it and R4, C7 form π type RC filter circuit, provide operating voltage to microprocessor.

Microprocessor N3 in this LED lamp that can close automatically after time of delay is programmed, the second output PWM output duty cycle when power connection that makes it is 100% pulse, after the trigger end of microprocessor receives a trigger impulse, the output pulse of second output is changed into duty ratio and is successively decreased gradually, and timing, when finishing to timing, the first output O1 exports a undersuing.The pulse signal of above-mentioned first output and second output offers pulse width controller, finishes brilliance control.Because the 4th filter capacitor can make microprocessor keep one period operating time when power supply disconnects, after the input of the power supply of this LED lamp that close automatically after can time of delay and AC power connection, what the light modulation end DIM of pulse width controller N1 received is that duty ratio is 100% pulse, and the LED lamp will be operated in full power state.The K switch of AC power close-is opened once, the input CK of microprocessor is triggered once, the pulse duty of second output PWM output begins to successively decrease gradually and timing, the duty ratio of the pulse signal that the light modulation end DIM of pulse width controller N1 receives is for successively decreasing gradually, and the brightness of LED lamp reduces gradually.When timing finished, undersuing of first output O1 output made the control end DIV output signal of pulse width controller transfer zero to the Enable Pin EN of pulse width controller, and the LED lamp is closed.After the LED lamp is closed, close-open the primary power source K switch again, just be returned to the total power output state.After this LED lamp is lighted, close-during ON operation, if K switch is connected after disconnecting the long period again, the electric weight in the capacitor C 7 is not enough to keep microprocessor work, and circuit also can be returned to initial condition, just is returned to the total power output state.

Filter N0, rectifier DB1, pulse width controller N1, constant-current controller N2 and microprocessor N3 in this LED lamp that can close automatically after time of delay all can adopt known model commonly used.

The utility model can be applicable to various indoor lamp lighting devices such as bulb class, fluorescent tube class, spotlight, strip light, following illuminator, decorative lamp, Recessed light class.

Claims (1)

1. LED lamp that energy is closed after time of delay automatically, comprise filter rectifier (1), ON-OFF control circuit (2), pulse transformer (T), constant-current drive circuit (3) and LED lamp string, described filter rectifier comprises filter (N0), rectifier (DB1), first filter capacitor (C1), ON-OFF control circuit comprises pulse width controller (N1), field effect transistor (Q1), second rectifier diode (D2) and second filter capacitor (C3), pulse transformer comprises primary coil (L1), secondary coil (L2) and first ancillary coil (L3), constant-current drive circuit comprises constant-current controller (N2), optical coupler (QP1, QP2), the 3rd rectifier diode (D3), the 3rd filter capacitor (C5), divider resistance (R10) and sample resistance (R11), it is characterized in that this LED lamp that can close automatically after time of delay also comprises microprocessor (N3), the 4th rectifier diode (D4), filter resistance (R4) and the 4th filter capacitor (C7), one group of second ancillary coil (L4) arranged on the described pulse transformer (T), the positive pole of one end of second ancillary coil and the 4th rectifier diode (D4) joins, the negative pole of the 4th rectifier diode joins by the positive pole of filter resistance (R4) with the 4th filter capacitor (C7), the negative pole of the other end of second ancillary coil and the 4th filter capacitor (C7) joins, the power end (VCC) of microprocessor (N3) joins with the positive pole of the 4th filter capacitor (C7), the trigger end of microprocessor (CK) joins with the negative pole of the 4th rectifier diode (D4), first output (O1) of microprocessor joins with the Enable Pin (EN) of pulse width controller (N1), second output (PWM) of microprocessor joins with the light modulation end (DIM) of pulse width controller (N1), and the collector electrode of the triode (QP1) in the feedback end (FB) of pulse width controller (N1) and the optical coupler joins.

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