CN204681638U - A kind of LED bulb intelligent recharge and discharge circuit - Google Patents

Abstract

The utility model relates to an intelligent charging and discharging circuit for LED light bulbs. The circuit includes a 220V rectifying circuit, an LED driving circuit, an LED lighting circuit, a power switching circuit and a lithium battery charging and discharging protection circuit. The 220V rectifier circuit is connected to the LED drive circuit, the output of the LED drive circuit is divided into two circuits, one is connected to the LED lighting circuit, the other is connected to the lithium battery charge and discharge protection circuit, and the lithium battery charge and discharge protection circuit is connected to the LED lighting circuit; power switch The circuit is connected to the lithium battery charge and discharge protection circuit and the 220V rectifier circuit to switch the power supply of the LED lighting circuit. The utility model can realize the effect that the bulb is still on in the case of a power failure, achieves the purpose of emergency power failure, and has good application prospects.

Description

An intelligent charging and discharging circuit for LED light bulbs

technical field

The utility model relates to an intelligent charging and discharging circuit for LED light bulbs.

Background technique

As a new type of lighting product, LED bulbs are currently used more and more in various indoor and outdoor occasions due to their advantages such as high brightness, low energy consumption, health, and environmental protection compared with old-fashioned incandescent lamps and fluorescent lamps. The wider the application. At present, LED light bulbs on the market generally only have ordinary lighting functions, are not highly intelligent, and do not have the function of emergency lighting for power failures. With the development of our country's social economy, the consumption of energy continues to increase. Many rural areas and even some urban areas often encounter short-term power outages due to energy shortages and power supply shortages. Traditional fire emergency lights and other equipment are due to the existence of The large size of the equipment and the cumbersome steps to use it are not suitable for large-scale promotion and use among home users. It is an urgent need to integrate intelligent lithium battery charging and discharging functions in LED light bulbs, so that the current LED light bulbs can be used for family power outage emergencies.

Utility model content

The purpose of the utility model is to provide an intelligent charging and discharging circuit for LED light bulbs. This circuit has the function of intelligently switching the power supply of LED bulbs: when the mains 220V is normally powered, the mains 220V provides power for the LED bulbs; when the mains 220V fails, it can automatically switch to the built-in lithium battery for the LED bulbs. The power supply, the whole process does not require any manual intervention, and has a high degree of intelligence, which can easily meet the emergency needs of households for temporary power outages.

The LED light bulb intelligent charging and discharging circuit circuit proposed by the utility model includes a 220V rectifying circuit, an LED driving circuit, an LED lighting circuit, a power switching circuit and a lithium battery charging and discharging protection circuit, the 220V rectifying circuit is connected with the LED driving circuit, and the output of the LED driving circuit It is divided into two circuits, one is connected to the LED lighting circuit, the other is connected to the lithium battery charge and discharge protection circuit, and the lithium battery charge and discharge protection circuit is connected to the LED lighting circuit. The power switch circuit is connected to the lithium battery charge and discharge protection circuit and the 220V rectifier circuit to switch the power supply of the LED lighting circuit.

When the mains power supply is normal, the power switching circuit automatically disconnects the channel between the lithium battery charge and discharge protection circuit and the LED lighting circuit, and switches the power supply of the LED lighting circuit to be powered by the LED drive circuit. At this time, the 220V voltage is rectified After the circuit is rectified, it becomes DC, and after the voltage is transformed and stabilized by the LED drive circuit, the output stable voltage and current are used to drive the LED lighting circuit. The LED lighting circuit is composed of multiple LED lamp beads connected in parallel. Realize the normal light of the bulb. At the same time, the other output of the LED drive circuit is used to charge the lithium battery to the lithium battery charge and discharge protection circuit. When the 220V mains power fails, the power switching circuit can automatically connect the channel between the lithium battery charge and discharge protection circuit and the LED lighting circuit, so that the power supply of the LED lighting circuit is switched to be powered by the lithium battery, which can be realized in the case of power failure. The effect of the light bulb is still on. The lithium battery charging and discharging protection circuit has the function of intelligently monitoring the lithium battery voltage: when the lithium battery voltage is between 2.3V and 4.2V, the charging and discharging circuit is automatically connected, and the lithium battery can be charged and discharged normally at this time; when the lithium battery voltage is less than When 2.3V or greater than 4.2V, the charging and discharging circuit is automatically cut off to avoid damage to the lithium battery due to overcharging or overdischarging.

When the voltage of the lithium battery charging and discharging protection circuit is between 2.3V and 4.2V, the charging circuit is automatically connected, and the lithium battery is charged and discharged normally; when the lithium battery voltage is less than 2.3V or greater than 4.2V, the charging and discharging circuit is automatically cut off.

The utility model adds the functions of lithium battery charging and discharging and dual power supply intelligent switching to the power circuit of the traditional ordinary LED light bulb. The whole circuit is small in size, light in weight and low in power consumption, and can be easily embedded in various types of LED Among lamps and lanterns, it has a good application prospect to achieve the purpose of power failure emergency.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the schematic circuit diagram of the utility model.

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Detailed ways

As shown in Figure 1, the LED light bulb intelligent charging and discharging circuit consists of 220V rectifying circuit 1, LED driving circuit 2, LED lighting circuit 3, power switching circuit 4, lithium battery charging and discharging protection circuit 5. 220V rectifying circuit 1 is used to The 220V AC voltage is converted to DC. The LED drive circuit 2 is used to supply power to the LED lighting circuit 3 and the lithium battery charging and discharging protection circuit 5. The power switching circuit 4 can realize the intelligent switching between the 220V mains power supply and the lithium battery power supply, and the charging and discharging of the lithium battery The protection circuit 5 has the function of intelligently monitoring the voltage of the lithium battery, which can prevent the lithium battery from being damaged due to overcharging or overdischarging.

The following introduces the connection mode and function of each part of the circuit in the circuit diagram 2: U1 is a rectifier bridge, which is used to rectify the external 220V AC voltage P1. U2 is an LED driver IC, and together with the transformer U3 and related peripheral components, it forms an LED driver circuit. The transformer U3 is divided into two outputs, one is output to the LED lighting circuit P2, and the other is output to the lithium battery P3. The lithium battery voltage monitoring chip U4 and the MOS tube switch chip U5 form a lithium battery charge and discharge protection circuit, which realizes the monitoring of the overdischarge and overcharge of the lithium battery P3, and can intelligently cut off the charge and discharge circuit. Transistors Q1, Q3, resistors R2, R3, R6, R8, and 220V zero-fire circuit form a power switching circuit: when the 220V is normally supplied, under the action of the mains voltage, the triodes Q1 and Q3 are cut off, and the lithium battery P3 is cut off for LED lighting. The path of the circuit P2, at this time, the lithium battery P3 does not work, and the 220V mains power supply P1 supplies power to the LED lighting circuit P2; when the 220V mains power fails, the transistors Q1 and Q3 are turned on, and the lithium battery P3 is connected to the LED lighting circuit The path of P2, that is, the lithium battery P3 supplies power to the LED lighting circuit P2.

Claims (2)

1. a LED bulb intelligent recharge and discharge circuit, it is characterized in that: circuit comprises 220V rectification circuit, LED drive circuit, LED illumination circuit, power supply switch circuit and lithium battery charge and discharge protective circuit, 220V rectification circuit is connected with LED drive circuit, the output of LED drive circuit is divided into two-way, LED illumination circuit is received on one tunnel, lithium battery charge and discharge protective circuit is received on another road, and lithium battery charge and discharge protective circuit is connected to LED illumination circuit; Power supply switch circuit is connected to lithium battery charge and discharge protective circuit and 220V rectification circuit, switches the power supply of LED illumination circuit.

2. LED bulb intelligent recharge and discharge circuit according to claim 1, is characterized in that: when described lithium battery charge and discharge protective circuit voltage is between 2.3V and 4.2V, automatically connect charge circuit, the normal discharge and recharge of lithium battery; When lithium battery voltage is less than 2.3V or is greater than 4.2V, automatically cut off charging and discharging circuit.