CN202749883U - Charger with alarm function - Google Patents

Abstract

A charger with an alarm function, which relates to a charging device. The plug at one end of the U circuit of the charger can be connected to a 220V power socket, the output end of the U circuit of the charger is connected to a rechargeable battery, and the positive terminal voltage of the charger passes through The cathode of diode D1 is connected to the anode of the charged battery, and resistor R1 is connected in parallel to diode D1. The anode of diode D1 is connected to transistor Q1 through resistor R2, the base of transistor Q1 is connected to diode D2, and the collector of transistor Q1 is transmitted through resistor R3. 1. Resistor R4 is divided and connected to the collector of transistor Q2. The base of transistor Q2 is connected to resistor R5 and capacitor C2 through diode D3. The collector of transistor Q2 is connected to transistor Q3 through resistor R7. The collector of transistor Q3 is grounded. The base of Q3 is connected to the transistor Q4, the base of the transistor Q4 is connected to the resistor R9, the resistor R9 is connected to the photoresistor RT1, the photoresistor RT1 is connected to the positive terminal of the power supply, and the buzzer Y1 is connected in series between the transistor Q4 and the photoresistor RT1. The utility model has simple structure and novel circuit design, can remind people to unplug the fully charged charger in time, and saves energy.

Description

Charger with alarm function

technical field

The utility model relates to the technical field of charging equipment, in particular to a charger with an alarm function.

Background technique

With the continuous improvement of people's living standards and quality of life, in today's information age, mobile phones have become an indispensable part of people's communication, communication and other functions, and the usage of mobile phones is increasing day by day. Most mobile phone users know that when the mobile phone is charging, such as charging at night or idle there, after the charging of the mobile phone is completed, if the mobile phone is not found and disconnected from the power supply in time, the mobile phone is still in the charging working state, which will cause serious problems. There are two disadvantages: first, when the mobile phone battery is still charging with full power for a long time, the service life of the mobile phone battery will be shortened; second, a part of electric energy will be wasted, for example, if a mobile phone is charged twice a week , in the case of not knowing that the battery is fully charged, still working for 3 hours, the power consumption is 0.002 degrees per week, 52 weeks a year, and the power consumption will be 0.002 degrees X 52 weeks a year: 0.104 degrees, calculated at 0.65 yuan per degree, The economic cost of electricity consumption for one year is 0.104 kWh X 0.65 yuan = 0.0676 yuan, so it doesn’t seem like a big deal to a mobile phone or a family. If you calculate it carefully, we count as having 100 million mobile phones in the whole country. , then the country’s invisible consumption of the economy is 0.002 degrees X 52 weeks X 0.65 yuan X 100000000 units = 6760000 yuan. Invisibly, it has brought pressure to the country in terms of electricity consumption, and the existing mobile phone chargers have invisibly brought huge waste of resources to our country and individuals, which is very inconsistent with our energy-saving society.

Utility model content

The technical problem to be solved by the utility model is to improve a charger that can automatically alarm after charging is completed.

The technical problem to be solved by the utility model adopts the following technical solutions to realize:

A charger with an alarm function, the plug at one end of the U circuit of the charger can be connected to a 220V power socket, the output end of the U circuit of the charger is connected to a rechargeable battery, and the positive terminal voltage of the charger passes through The cathode of the diode D1 is connected to the positive pole of the rechargeable battery, and the diode D1 is connected in parallel with a resistor R1. The anode of the diode D1 is connected to the transistor Q1 through the resistor R2, the base of the transistor Q1 is connected to the diode D2, and the collector of the transistor Q1 After the voltage is divided by the resistor R3 and the resistor R4, it is connected to the collector of the transistor Q2, the base of the transistor Q2 is connected to the resistor R5 and the capacitor C2 through the diode D3, and the collector of the transistor Q2 is connected to the transistor Q3 through the resistor R7. The collector of the transistor Q3 is grounded, the base of the transistor Q3 is connected to the transistor Q4, the base of the transistor Q4 is connected to the resistor R9, the resistor R9 is connected to the photoresistor RT1, and the photoresistor RT1 is connected to the positive terminal of the power supply. A buzzer Y1 is connected in series between the transistor Q4 and the photoresistor RT1.

A resistor R8 is connected in parallel between the photoresistor RT1 and the resistor R9, and one end of the resistor R8 is grounded.

The beneficial effects of the utility model are: the utility model has a simple structure and a novel circuit design, which can remind people to unplug the fully charged charger in time, save energy, and use a photosensitive resistor to control the sound of the buzzer, so that the buzzer People will not be woken up after sleeping at night.

Description of drawings

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

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific illustrations.

As shown in Figure 1, select a charger with an output voltage of 5-20V. First, insert the plug on the U circuit of the charger into a 220V power socket, and connect the output terminal of the U circuit of the charger to the rechargeable battery. At this time, the charger If it is a 5V charger, the 5V voltage at the positive terminal of the charger is connected to the positive pole of the rechargeable battery through the negative pole of the diode D1, and the resistor R1 is connected in parallel with the diode D1, at this time, a voltage drop of about 0.7V is generated at both ends of the diode D1 Therefore, the base voltage of the transistor Q1 is lower than the emitter voltage, the transistor Q1 is turned on, the collector outputs a high level, and at the same time, the capacitor C1 is charged, and at the same time, it is connected to the collector of the transistor Q2 after being divided by the resistors R3 and R4 , while the charger U circuit is working, the output +5V voltage is charged to the capacitor C2 through the resistor R5, and the capacitor C2 is charged at the same time, so that the triode Q2 is turned on, and the collector transmits a high level to make the triode Q3 turn on, and the triode Q4 is turned off , so that the buzzer Y1 does not sound, the base of the triode Q4 is connected to the resistor R9, the resistor R9 is connected to the photoresistor RT1, and the photoresistor RT1 is connected to the positive terminal of the power supply 5V. When the light is strong, the resistance of the photoresistor RT1 becomes smaller, and the voltage is divided to the ground by the resistor R8, and then the high level is provided to the base of the transistor Q4 through the resistor R9. As the capacitor C2 is quickly charged, the base voltage of the transistor Q2 Higher than the emitter voltage, the transistor Q2 is cut off, but at this time, due to the conduction of the transistor Q1, the transistor Q3 remains on, the transistor Q4 remains off, and the buzzer Y1 does not sound; when the charged battery is fully charged, the two ends of the diode D1 The voltage drop decreases, so that the base voltage of the transistor Q1 is close to the emitter voltage, the transistor Q1 is cut off, and the transistor Q3 is cut off. At this time, the light received by the photoresistor RT1 is very strong, and the resistance of the photoresistor RT1 is very small, and the voltage is divided by the resistor R8 Finally, the voltage delivered through the resistor R9 turns on the transistor Q4, and the buzzer Y1 sounds an alarm when it is powered on, indicating that the battery is fully charged. Please remove the battery and the charger from the 220V power supply to save electricity. The resistance of the photoresistor RT1 becomes larger when the light is dark, which cannot make the transistor Q4 conduction, so the buzzer Y1 will not make a sound when the light is dark at night when the battery is fully charged.

The basic principles and main features of the present utility model and the advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (2)

1. with the charger of warning function, it is characterized in that: the end plug on the U circuit of charger can be connected in the 220V supply socket, the output of charger U circuit is connected on the band rechargable battery, the negative pole of the positive terminal voltage of described charger by the first diode (D1) is connected to the positive pole with rechargable battery, and be parallel with the first resistance (R1) on the first diode (D1), the positive pole of described the first diode (D1) is connected to the first triode (Q1) by the second resistance (R2), the base stage of described the first triode (Q1) connects the second diode (D2), the collector electrode of described the first triode (Q1) is defeated through the 3rd resistance (R3), be connected to the collector electrode of the second triode (Q2) after the 4th resistance (R4) dividing potential drop, the base stage of described the second triode (Q2) is connected to the 5th resistance (R5) and the second electric capacity (C2) through the 3rd diode (D3), described the second triode (Q2) collector electrode is connected to the 3rd triode (Q3) through the 7th resistance (R7), the grounded collector of described the 3rd triode (Q3), the base stage of described the 3rd triode (Q3) is connected to the 4th triode (Q4), the base stage of described the 4th triode (Q4) connects the 9th resistance (R9), the 9th resistance (R9) connects photo resistance (RT1), photo resistance (RT1) is connected to power positive end, is in series with buzzer (Y1) between described the 4th triode (Q4) and the photo resistance (RT1).

2. the charger with warning function according to claim 1 is characterized in that: one the 8th resistance (R8) in parallel between described photo resistance (RT1) and the 9th resistance (R9), described the 8th resistance (R8) end ground connection.

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