CN201312131Y - Cell phone charging circuit and cell phone battery charging system - Google Patents

Abstract

A mobile phone charger that can automatically cut off power, a mobile phone charging circuit and its system, the mobile phone battery charging system includes a charger circuit and a mobile phone charging circuit, the charger circuit includes: a voltage-current conversion module and a relay; the mobile phone charging circuit includes: charging The control module and the first voltage comparison module preset with the first voltage comparison value V1, when the voltage of the positive and negative poles of the mobile phone battery is greater than or equal to V1, the relay can be powered off according to the control signal from the mobile phone charging circuit. In this way, when the charging is over, even if the charger is still plugged into the power supply, there will be no current in the internal circuit of the charger, thereby preventing the generation of empty consumption of the charger and saving power. If you don't know the charging time of the mobile phone battery, you can safely plug the charger into the power supply, and then unplug it from the power supply when it is convenient.

Description

Mobile phone charging circuit and its battery charging system

technical field

The utility model relates to a mobile phone charging circuit and a battery charging system thereof.

Background technique

The idle consumption of the charger refers to the power consumption when the battery of the mobile phone is fully charged, the voltage of the battery will not increase, and the charger is still plugged into the power supply.

At present, mobile phones have gradually become a necessity in people's daily life. When users charge their mobile phones, they generally plug the charger into the power supply for one night or half a day. The empty consumption of the device. According to the survey, at present, in the entire life cycle of mobile phone products, two-thirds of the power consumption comes from the idle consumption of the charger.

The patent number is 200620117159.2, and in the utility model patent specification titled "Smart Phone Charger", a smart phone charger that can automatically disconnect the circuit after the mobile phone completes the charging task is disclosed. As shown in Figure 1, a switch 3 and a time relay 1 are connected in series between a power input terminal 8 of the mobile phone charger circuit board 6 and a plug 4 in this smart mobile phone charger, and the mobile phone charger circuit board 6 The other power input terminal 9 of the mobile phone is directly connected to the other power plug 7, and an indicator light 2 is connected in parallel at the connection between the two input terminals 8, 9 of the mobile phone charger circuit board 6 and the two power plugs 4, 7, and the mobile phone is charged. The circuit board power supply output terminals 10, 11 of the device are connected with the charging connection socket of the mobile phone (not shown in Fig. 1 ) by a lead 5. When the mobile phone battery needs to be charged, the time required for charging is preset on the time relay 1, so that when the preset time expires, the relay will automatically power off, and the charger will stop charging, thereby preventing the charger from emptying.

Using this smart mobile phone charger to prevent the charger from running out, there is a premise that the user must know the time required to fully charge the battery of the mobile phone before charging. For a new mobile phone battery, the charging time required from the exhausted state to the full state can be determined by consulting the product manual of the mobile phone. However, when a battery is used for a period of time, the charging time it actually needs from the exhausted state to the full state may not be consistent with the time indicated in the manual; If the battery is charged, then the time to fully charge the battery is more difficult to determine.

Utility model content

The purpose of the utility model is to provide a mobile phone charging circuit and battery charging system that does not need to manually set the charging time, and can automatically cut off the power after the charging of the mobile phone battery is completed, thereby preventing the charger from being empty.

A mobile phone charging circuit, comprising:

The charging control module connected to the positive and negative poles of the mobile phone battery is used to receive the charging voltage and charging current of the output terminal of the mobile phone charger, control the charging of the mobile phone battery, and detect the voltage value between the positive and negative poles of the mobile phone during the charging process V, and output V to the first voltage comparison module;

A first voltage comparison module preset with a first voltage comparison value V1, the input terminal of the first voltage comparison module is connected to the charging control module for receiving V, and comparing V with V1, when V is greater than or equal to V1, the first voltage comparison module outputs a control signal for disconnecting the relay.

Further, it also includes a second voltage comparison module preset with a second voltage comparison value V2, the input terminal of the second voltage comparison module is connected with the charging control module, and the charging control module is not charging the battery of the mobile phone. When charging, detect the voltage value V between the positive and negative poles of the mobile phone and output V to the second voltage comparison module. The second voltage comparison module compares V and V2. When V is less than or equal to V2, the second voltage comparison module The module outputs a control signal to close the relay.

The utility model also provides a mobile phone battery charging system, including a charger circuit and a mobile phone charging circuit, and the charger circuit includes:

A voltage-current conversion module with a first input terminal and a second input terminal is used to convert the voltage and current input by the first input terminal and the second input terminal into the charging voltage and charging current of the mobile phone battery and output them;

A relay is serially connected to the first input terminal or the second input terminal of the voltage-current conversion module, and the control terminal of the relay is used to receive a control signal sent by the mobile phone to close or disconnect the relay;

The output terminal of the voltage-current conversion module and the control terminal of the relay are connected to the charging circuit of the mobile phone, and the charging circuit of the mobile phone is used to send a control signal for closing or disconnecting the relay.

Further, the mobile phone charging circuit specifically includes:

The charging control module connected to the positive and negative poles of the mobile phone battery is used to receive the charging voltage and charging current of the output terminal of the mobile phone charger, control the charging of the mobile phone battery, and detect the voltage value between the positive and negative poles of the mobile phone during the charging process V, and output V to the first voltage comparison module;

A first voltage comparison module preset with a first voltage comparison value V1, the input terminal of the first voltage comparison module is connected to the charging control module for receiving V, and comparing V with V1, when V is greater than or equal to V1, the first voltage comparison module outputs a control signal for disconnecting the relay.

Further, a working status indicator light is also included, and the two ends of the working status indicator light are respectively connected to the first input end and the second input end.

Further, it also includes a second voltage comparison module preset with a second voltage comparison value V2, the input terminal of the second voltage comparison module is connected with the charging control module, and the charging control module is not charging the battery of the mobile phone. When charging, detect the voltage value V between the positive and negative poles of the mobile phone and output V to the second voltage comparison module. The second voltage comparison module compares V and V2. When V is less than or equal to V2, the second voltage comparison module The module outputs a control signal to close the relay.

The utility model will be further described below according to the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a schematic diagram of the circuit structure of the name "smart phone charger" described in the background technology;

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

Detailed ways

Embodiment one

As shown in Figure 2, a mobile phone charger that can automatically power off is characterized in that it includes:

A voltage-current conversion module with a first input terminal 211 and a second input terminal 212 is used to convert the input voltage and current into the charging voltage and charging current of the mobile phone battery and output them;

The relay 22 is serially connected to the first input end 211 or the second input end 212 of the voltage-current conversion module 21, and the control end 221 of the relay is used to receive a control signal for closing or opening the relay 22 sent by the mobile phone.

Wherein, a working state indicator light 23 is also included, and the two ends of the working state indicator light 23 are respectively connected to the first input end 211 and the second input end 212 . The working state indicator light 23 is a light emitting diode. When the charger is in the working state, the light-emitting diode is illuminated; when the charger is in the non-working state, the light-emitting diode is in the extinguished state.

Wherein, a first connector (not shown in FIG. 2 ) is also included, and the output terminal of the voltage-current conversion module 21 is also the output terminal of the charger, which is connected to the first connector wire, so that the The output terminal of the charger is connected with the charging control module 31 of the mobile phone charging circuit.

Wherein, the control terminal 221 of the relay 22 is connected with the first connector wire, so that the control terminal 221 can be conveniently connected with the first voltage comparison module 331 and the second voltage comparison module 332 of the mobile phone charging circuit.

The first connector is a USB miniature (Mini) B type 5-pin male interface.

Embodiment two

As shown in Figure 2, a mobile phone charging circuit includes:

The charging control module 31 that is connected with the positive pole of mobile phone battery 32 and negative pole is used for receiving the charging voltage and the charging current of the output terminal of mobile phone charger, and the charging of mobile phone battery 32 is controlled, and in charging process (this moment, relay closure ) detect the voltage value V between the positive and negative poles of the mobile phone, and output V to the first voltage comparison module 331;

A first voltage comparison module 331 preset with a first voltage comparison value V1, the input terminal of the first voltage comparison module 331 is connected to the charging control module 31 for receiving V and comparing V with V1, When V is greater than or equal to V1, the first voltage comparison module 331 outputs a control signal for disconnecting the relay 22;

Wherein, it also includes a second voltage comparison module 332 preset with a second voltage comparison value V2, the input terminal of the second voltage comparison module 332 is connected with the charging control module 31, and the charging control module 31 is When the mobile phone battery 32 is being charged (at this moment, the relay is disconnected), the voltage value V between the positive and negative poles of the mobile phone is detected and output V to the second voltage comparison module 332, and the second voltage comparison module 332 compares V and V2 , when V is less than or equal to V2, the second voltage comparison module 332 outputs a control signal for closing the relay 22 .

Wherein, the maximum voltage of the mobile phone battery 32 is 4.20V after it is fully charged under the best state of battery performance, and V1 can be preset to be less than but close to this maximum voltage value. In this specific embodiment, the preset V1 is 4.18V, and V2 is 4.10V. V.

Wherein, a second connector (not output in FIG. 2 ) is also included, and the port of the charging control module 31 for receiving charging voltage and charging current is connected to the second connector, so that the charging The control module 31 is connected with the output terminal of the mobile phone charger.

Wherein, the output terminal of the first voltage comparison module 331 and the output terminal of the second voltage comparison module 332 are all connected to the second connector, so that the first voltage comparison module 331 and the second voltage comparison module 331 can be compared conveniently. The module 332 is connected with the control terminal 221 of the relay in the charger.

The second connector is a USB miniature (Mini) B-type 5-pin female interface, which is used in conjunction with the aforementioned USB miniature (Mini) B-type 5-pin male interface. Mis-insertion performance is better.

Embodiment three

As shown in Fig. 2, a mobile phone battery charging system includes a charger circuit 2 and a mobile phone charging circuit 3, and the charger circuit 2 includes a voltage-current conversion module 21 and a relay 22 as described in Embodiment 1. The output terminal of the voltage-current conversion module 21 and the control terminal 221 of the relay 22 are connected to the charging circuit 3 for the mobile phone, and the charging circuit for the mobile phone is used to send a control signal for closing or disconnecting the relay 22;

Wherein, the mobile phone charging circuit 3 includes the charging control module 31 and the first voltage comparison module 331 as described in the second embodiment;

Wherein, the charger circuit 2 also includes a working status indicator light 23 as described in the first embodiment;

Wherein, the mobile phone charging circuit 3 further includes a second voltage comparison module 332 as described in the second embodiment.

When using the mobile phone charger, mobile phone charging circuit and mobile phone battery charging system in the above-mentioned embodiment to charge the mobile phone battery, the charger is connected to the mobile phone charging circuit through the USB small (Mini) B-type 5-pin interface. In this way, the connection between the output terminal of the voltage-current conversion module 21 and the charging control module 31 , and the connection between the control terminal 221 of the relay and the first voltage comparison module 331 and the second voltage comparison module 332 are realized. When the charger is connected to the AC power supply, the relay 22 is in a closed state at this time, and the internal circuit of the charger and the charging circuit of the mobile phone form a closed charging loop. After the voltage-current conversion module 21 transforms and rectifies the 220V AC, it outputs the charging voltage and charging current to the charging control module 31. On the one hand, the charging control module 31 controls the charging of the mobile phone battery, and on the other hand, detects the positive and negative poles of the mobile phone battery in real time. Between the voltage value V, and V is sent to the first voltage comparison module 331 to determine whether it is greater than or equal to 4.18V, if so, the first voltage comparison module 331 will send a control signal to the control terminal 221 of the relay, and the relay 22 is disconnected , the charging circuit is disconnected, the charger is in a non-working state, and the LED goes out. In this way, when the charging is finished, the charger is in a non-working state. Even if the charger is still plugged into the power supply, there will be no current in the internal circuit of the charger, thereby preventing the generation of empty consumption of the charger and saving power. Even if the user of the charger does not know the charging time of the mobile phone battery, he can safely plug the charger into the power supply, and then pull it out of the power supply when it is convenient.

When the above-mentioned charging process ends, the charging control module 31 continues to detect the voltage value V between the positive and negative poles of the mobile phone battery. At this time, the relay 22 is disconnected, and the charging control module 31 is in a non-charging state, and the charging control module 31 sends V to the second battery. The voltage comparison module 332 judges whether it is less than or equal to 4.10V, if so, the second voltage comparison module 332 will send a control signal to the control terminal 221 of the relay, the relay 22 is closed, the charging circuit is closed again, the charger works again, and the light-emitting diode Lights up until the battery voltage is greater than or equal to 4.18V. In this way, after the battery of the mobile phone is fully charged, if the charger is still plugged into the power supply, the voltage of the positive and negative poles of the battery of the mobile phone will always remain between 4.10V and 4.18V.

Claims (6)

1, a kind of cell phone charging circuit is characterized in that comprising:

The charge control module that is connected with negative pole with the positive pole of battery of mobile phone, be used to receive the charging voltage and the charging current of the output of charger for mobile phone, charging to battery of mobile phone is controlled, magnitude of voltage V in charging process between the detection of handset positive and negative polarities, and output V to the first voltage comparison module;

Be preset with first voltage comparison module of the first voltage comparison value V1, the input of this first voltage comparison module is connected with described charge control module, be used to receive V, and V and V1 compared, as V during more than or equal to V1, this first voltage comparison module output disconnects the control signal of relay.

2, cell phone charging circuit as claimed in claim 1, it is characterized in that: also comprise second voltage comparison module that is preset with the second voltage comparison value V2, the input of this second voltage comparison module is connected with described charge control module, described charge control module is not when charging to battery of mobile phone, magnitude of voltage V between the detection of handset positive and negative polarities also exports V to described second voltage comparison module, described second voltage comparison module is V and V2 relatively, when V is less than or equal to V2, the control signal of this second voltage comparison module output closing relay.

3, a kind of cell phone battery charge system is characterized in that comprising charger circuit and cell phone charging circuit, and described charger circuit comprises:

Be provided with the electric current and voltage modular converter of first input end, second input, be used for the voltage of first input end, the input of second input, charging voltage and charging current and the output that current conversion is battery of mobile phone;

Relay is serially connected with on the first input end or second input of described electric current and voltage modular converter, and the control end of this relay is used to receive the control signal with relay closes or disconnection that mobile phone sends;

The control end of described electric current and voltage modular converter output and described relay is connected with described cell phone charging circuit, and described cell phone charging circuit is used to send the control signal with relay closes or disconnection.

4, cell phone battery charge system as claimed in claim 3 is characterized in that described cell phone charging circuit specifically comprises:

The charge control module that is connected with negative pole with the positive pole of battery of mobile phone, be used to receive the charging voltage and the charging current of the output of charger for mobile phone, charging to battery of mobile phone is controlled, magnitude of voltage V in charging process between the detection of handset positive and negative polarities, and output V to the first voltage comparison module;

Be preset with first voltage comparison module of the first voltage comparison value V1, the input of this first voltage comparison module is connected with described charge control module, be used to receive V, and V and V1 compared, as V during more than or equal to V1, this first voltage comparison module output disconnects the control signal of relay.

5, cell phone battery charge system as claimed in claim 3 is characterized in that: also comprise working station indicator, the two ends of described working station indicator are connected on the described first input end and second input.

6, cell phone battery charge system as claimed in claim 4, it is characterized in that: also comprise second voltage comparison module that is preset with the second voltage comparison value V2, the input of this second voltage comparison module is connected with described charge control module, described charge control module is not when charging to battery of mobile phone, magnitude of voltage V between the detection of handset positive and negative polarities also exports V to described second voltage comparison module, described second voltage comparison module is V and V2 relatively, when V is less than or equal to V2, the control signal of this second voltage comparison module output closing relay.

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