CN201044530Y - A blackout lighting - Google Patents

Abstract

The utility model relates to a power failure illuminating lamp, which comprises a telephone line input terminal, a DC-DC chip, a switch, an adjustable resistor and an LED device. The positive pin and the negative pin of the input end of the DC-DC chip are respectively connected with the negative pole and the positive pole of the telephone line, the positive pin of the output end is connected with a pin of the switch, and the negative pin is connected with the negative pole of the LED. The anode of the LED is connected to one end of the adjustable resistor, and the other end of the adjustable resistor is connected to the other end of the switch. At the same time, two input pins of the DC-DC chip directly have two parallel bypass capacitors, and two output pins directly have two parallel bypass capacitors. The beneficial effect of the utility model is that it realizes the function of providing lighting in the case of power failure, and has a simple circuit, and adopts LED lighting at the same time, which has the advantages of high efficiency and long life.

Description

A blackout lighting

technical field

The utility model relates to a power failure illuminating lamp.

Background technique

If there is a power outage at night, it will bring a lot of inconvenience to life. But in the case of a power outage, people's landline telephone lines can still work, and in standby mode, they can provide -48V DC voltage and at least 500mW of power. The LED is a high-efficiency light-emitting device, which can provide good lighting with less power. Illumination can thus be provided using telephone lines and LED devices.

Utility model content

The utility model provides an illuminating lamp in the case of power failure, which utilizes a telephone line to provide power and uses an LED as a light-emitting device.

The technical solution to solve the problem is: it includes telephone line input terminals In+ and In-, a DC-DC chip U1, a switch SW, an adjustable resistance R, and an LED device. The positive pole pin Vi+ and the negative pole pin Vi- of the input end of the DC-DC chip U1 are respectively connected with the negative pole In- and the positive pole In+ of the telephone line, and the positive pole pin Vo+ of the output end is connected with a pin of the switch SW, and the negative pole pin The pin Vo- is connected with the cathode of the LED. The anode of the LED is connected to one end of the adjustable resistor R, and the other end of the adjustable resistor R is connected to the other end of the switch SW. At the same time, the two input pins of the DC-DC chip U1 are indirectly connected with parallel bypass capacitors C1 and C2, and the two output pins are indirectly connected with parallel bypass capacitors C3 and C4.

The beneficial effect of the utility model is that it realizes the function of providing lighting in the case of power failure, and has a simple circuit, and adopts LED lighting at the same time, which has the advantages of high efficiency and long life.

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

Description of drawings

Fig. 1 is a schematic circuit diagram of the utility model.

Detailed ways

According to Figure 1, the voltage of the telephone line input DC-DC chip U1 is +48V in the standby state, and the white light LED has a better luminous effect when the voltage is +3V, so the chip PTMA403033 is selected. The input signal voltage range of this chip is +36V～+75V, the output voltage is +3.3V, the power conversion efficiency can reach 87%, and the power provided by most telephone lines can be transferred to the LED. DC-DC chip U1 output positive electrode Vo+ is connected with switch SW, when SW is disconnected, the circuit does not work and LED will not light up, but when switch SW is closed, the circuit forms a complete loop and LED can be lit. The LED is composed of three white light-emitting diodes D1, D2, and D3 connected in parallel. LED realizes lighting. Compared with the traditional white woven bulb, it has the advantages of high luminous efficiency and long service life, and the power provided by the telephone line itself is also small, so LED is selected as the light emitting device. At the same time, considering that the power that the telephone line can provide is small, and the use of lighting lamps cannot affect the telecommunication system, three LEDs are selected, and the total power is about 100mW. The resistance value of the adjustable resistor R is 0-100 ohms. By adjusting R, on the one hand, it can change the current of the circuit, thereby controlling the power consumption of the LED and adjusting the brightness of the LED. On the other hand, it can also protect the LED from overvoltage. Function, prolong the service life of LED. The bypass capacitors C1, C2, C3, and C4 filter out the AC interference in the DC signal to ensure the stable operation of the system. Among them, C1 and C3 are 10μ method electrolytic capacitors, the positive electrode of the capacitor is connected to the positive electrode of the DC-DC chip, and the negative electrode of the capacitor is connected to the negative electrode of the DC-DC chip. C2 and C4 are 0.1μ method capacitors with no polarity.

The utility model utilizes the power provided by the telephone line, and obtains low voltage and high current through the DC-DC chip to make the LED emit light, and can be used as an illuminating lamp for families and offices when the power is cut off at night. The implementation of the system is simple, and at the same time, because of the high luminous efficiency of the LED, although the power provided by the telephone line is small, it can also have a good effect.

Claims (3)

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.