CN201044530Y

CN201044530Y - Automatic emergency light

Info

Publication number: CN201044530Y
Application number: CNU2007201244051U
Authority: CN
Inventors: 曾浩; 刘玲; 谭晓衡; 黄智勇; 张承畅; 刘晓
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2007-06-04
Filing date: 2007-06-04
Publication date: 2008-04-02
Anticipated expiration: 2017-06-04

Abstract

An automatic emergency light comprises a telephone line input terminal, a DC-DC chip, a switch, an adjustable resistance and a LED device. The anode pin and the cathode pin of the input terminal of the DC-DC chip are respectively connected with the cathode and the anode of the telephone line; the anode pin of the output terminal is connected with a pin of the switch; the cathode pin of the output terminal is connected with the cathode of the LED. The anode of the LED is connected with one end of the adjustable resistance; the other end of the adjustable resistance is connected with the other end of the switch. At the same time, two shunt capacitors in parallel connection are connected between two pins of the input terminal of the DC-DC chip; two shunt capacitors in parallel connection are connected between two pins of the output terminal of the DC-DC chip. The utility model has the advantages of achieving the lighting supply function in the condition of power-cut and having a simple circuit, high efficiency and long life-span as LED lighting is adopted.

Description

A kind of automatic emergency light

Technical field

The utility model relates to automatic emergency light.

Background technology

If run into power failure night, can bring a lot of inconvenience to democratic meeting.But under power-off condition, people's fixed line phone line still can be worked, and under holding state, can provide-the 48V direct voltage, at least the power of 500mW.And LED is a kind of high efficiency luminescent device, and smaller power just can provide good illumination.Thereby can utilize telephone wire and LED device that illumination is provided.

The utility model content

The utility model provides the illuminating lamp under a kind of power-off condition, and this lamp utilizes telephone wire that power is provided, and uses LED as luminescent device.

The technical scheme that solves described problem is: it comprises telephone wire input In+ and In-, DC-DC chip U1, switch SW, adjustable resistance R, LED device.Described DC-DC chip U1 input anode pin Vi+ links to each other with anodal In+ with the negative pole In-of telephone wire respectively with negative pole pin Vi-, and its output head anode pin Vo+ links to each other with pin of described switch SW, and negative pole pin Vo-links to each other with the negative pole of LED.Described LED positive pole links to each other with adjustable resistance R one end, and the adjustable resistance R other end then connects the other end of switch SW.Simultaneously, DC-DC chip U1 imports and is connected to shunt capacitance C1 in parallel and C2 between two pins, exports and is connected to shunt capacitance C3 in parallel and C4 between two pins.

The beneficial effects of the utility model are that it has realized providing illumination functions under power-off condition, and circuit is simple, adopts the LED illumination simultaneously, has the efficient height, the advantage that the life-span is long.

Below in conjunction with accompanying drawing the utility model is further described.

Description of drawings

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

Embodiment

According to Fig. 1, telephone wire input DC-DC chip U1 voltage under holding state is+48V, and white light LEDs illumination effect when+3V voltage is better, so, select chip PTMA403033.This chip applied signal voltage scope is+36V～+ 75V, output voltage is+3.3V that power conversion efficiency can reach 87%, can pass to LED to the power exhausted big how many telephone wires provide.DC-DC chip U1 output cathode Vo+ links to each other with switch SW, and when SW disconnected, circuit was not worked, and LED can be not bright, and switch SW is when closed, and circuit forms complete loop, and LED can light.LED selects light-emitting diode D1, D2, the D3 of three white lights to be formed in parallel, and their negative poles link to each other with DC-DC chip U1 output negative pole pin Vo-, and is anodal continuous with adjustable resistance R.LED realizes illumination, has the luminous efficiency height with respect to traditional lamp bulb, the advantage of long service life, and the power that telephone wire provides itself is also less, so select for use LED as luminescent device.Simultaneously, the power that the consideration telephone wire can provide is less, and illuminating lamp uses and can not impact telecommunication system again, selects three LED, the about 100mW of gross power.The resistance of adjustable resistance R is 0～100 ohm, and by regulating R, it can change the circuital current size on the one hand, thereby control LED consumed power makes LED brightness adjusted, also can play on the other hand the effect of LED overvoltage protection, prolongs LED useful life.Shunt capacitance C1, C2, C3, C4 then are that the interchange in the filtering direct current signal is disturbed, and guarantee system stability work.Wherein, C1, C3 are 10 μ method electrochemical capacitors, and capacitance cathode links to each other with the DC-DC chip is anodal, and the electric capacity negative pole links to each other with DC-DC chip negative pole, and C2, C4 are 0.1 μ method electric capacity, and be nonpolarity.

The utility model utilizes telephone wire that power is provided, and obtains low-voltage and high-current by the DC-DC chip, makes LED luminous, the illuminating lamp when can be used as family and office's electricity failure at night.System realizes simple, simultaneously, because the luminous efficiency height of LED though telephone wire provides power less, also can have very good effect.

Claims

1. automatic emergency light, comprise the telephone wire input, the DC-DC chip, switch, adjustable resistance, LED device in parallel, it is characterized in that: DC-DC chip input anode pin links to each other with anodal with the negative pole of telephone wire respectively with the negative pole pin, and its output head anode pin links to each other with pin of switch, and the negative pole pin links to each other with the LED negative pole, the LED positive pole then links to each other with adjustable resistance one end, and the adjustable resistance other end then connects the switch other end.

2. according to the described a kind of automatic emergency light of claim 1, it is characterized in that: the shunt capacitance that is connected to two parallel connections at DC-DC chip input, one is electrochemical capacitor, one is polarity free capacitor, be connected to two shunt capacitances in parallel at the DC-DC chip output, one is electrochemical capacitor, and one is polarity free capacitor.

3. according to the described a kind of automatic emergency light of claim 1, it is characterized in that: the LED device is made of the light-emitting diode of a plurality of parallel connections, links to each other with adjustable resistance one end behind their anodal short circuits, links to each other with DC-DC chip output negative pole behind the negative pole short circuit.