CN202395505U - Battery charging circuit - Google Patents

Abstract

The utility model discloses a battery charging circuit which comprises a power supply system (1) and a battery (2), and is characterized by also comprising a switch unit (3) connected between the power supply system (1) and the battery (2), a singlechip (4) for controlling the switch unit (3) to be switched on or off and a temperature collecting module (5) for collecting temperature and sending the temperature to the singlechip (4), wherein the singlechip (4) is connected with the switch unit (3), and the signal output end of the temperature collecting module (5) is connected with the singlechip (4). According to the battery charging circuit, the temperature collecting module collects the charging environment temperature and sends the charging environment temperature to the singlechip, and the singlechip processes the charging environment temperature and then outputs a control signal to control the switch unit to be switched on or off, so that the power supply system is controlled to charge the battery or stop charging the battery, thus fully-automatic high and low temperature protection of charging of the battery is realized, and real-time monitoring of workers is not needed.

Description

battery charging circuit

technical field

The utility model relates to the field of power supply circuits, in particular to a battery charging circuit. the

Background technique

When many batteries are charged in a high temperature or low temperature environment, due to changes in the physical characteristics of the battery, it is easy to cause damage to the battery. For example, when the ambient temperature is higher than 65 degrees or lower than 0 degrees for the battery that powers the machine, no matter how many volts the battery voltage is, the battery must stop charging to avoid direct damage to the battery caused by excessive temperature or low temperature. The working battery of the power supply in the prior art is directly connected to the power system when charging, and a thermometer is placed nearby to detect the temperature of the charging environment. When the detected temperature is within the range of 0 degrees to 65 degrees, the power system can be turned on to charge. During the charging process, the temperature of the charging environment will rise. When the temperature is detected to be higher than 65 degrees, the power system must be turned off immediately to stop charging. In this process, someone has to monitor it all the time, which is very troublesome. Even if someone monitors, sometimes the power system cannot be turned off in time, causing damage to the battery. the

Utility model content

The technical problem to be solved by the utility model is to provide a battery charging circuit that can automatically stop charging in a set high and low temperature environment, and recharge when the temperature returns to the set range. the

In order to achieve the above purpose, the technical solution provided by the utility model is: a battery charging circuit, including a power system and a battery, and also includes a switch unit connected between the power system and the battery, and a single-chip microcomputer for controlling the switch unit to be turned on or off and a temperature acquisition module for collecting temperature and sending it to the single-chip microcomputer, the single-chip microcomputer is connected with the switch unit, and the signal output terminal of the temperature collection module is connected with the single-chip microcomputer. the

After adopting the above technical scheme, the utility model has the following advantages compared with the prior art: the battery charging circuit of the utility model collects the charging environment temperature through the temperature acquisition module and sends it to the single-chip microcomputer, and outputs the control signal to control the switch unit after being processed by the single-chip microcomputer On or off, in order to control the power system to charge the battery or stop charging, so as to realize the automatic high and low temperature protection of the battery charging, without real-time monitoring by workers. the

As an improvement, the temperature acquisition module includes a voltage dividing resistor and a thermistor, one end of the thermistor is grounded, the other end is connected in series with the voltage dividing resistor and connected to the power system, and the other end of the thermistor is also used as a temperature acquisition The signal output end of the module is connected with the single chip microcomputer. The module is simple in structure, and can accurately detect the temperature of the charging environment and send it to the single-chip microcomputer. The thermistor is sold in the market, and the price is cheap. the

Preferably, the model of the thermistor is NCP15XQ681J0SRC. the

Description of drawings

Fig. 1 is a block diagram of the utility model battery charging circuit. the

As shown in the figure, 1. Power supply system 2. Battery 3. Switch unit 4. Single-chip microcomputer 5. Temperature acquisition module 5.1. Voltage divider resistor 5.2. Thermistor. the

Detailed ways

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

As shown in the accompanying drawings: a battery charging circuit, including a power supply system 1 and a battery 2 . It also includes a switch unit 3 connected between the power system 1 and the battery 2 , a single-chip microcomputer 4 for controlling the switch unit 3 to be turned on or off, and a temperature acquisition module 5 for collecting temperature and sending it to the single-chip microcomputer 4 . The model of the single-chip microcomputer 4 selected in this embodiment is C8051F060, and the single-chip microcomputer 4 of this type has its own high-performance analog-to-digital converter. The single-chip microcomputer 4 is connected with the switch unit 3 , and the signal output terminal of the temperature acquisition module 5 is connected with the single-chip microcomputer 4 . the

The temperature acquisition module 5 includes a voltage dividing resistor 5.1 and a thermistor 5.2. The model of the thermistor 5.2 used in this embodiment is NCP15XQ681J0SRC. One end of the thermistor 5.2 is grounded, the other end is connected in series with the voltage dividing resistor 5.1 and then connected to the power supply system 1, and the other end of the thermistor 5.2 is also connected to the single chip microcomputer 4 as the signal output end of the temperature acquisition module 5. the

The power supply system 1 has two functions, one is to charge the battery, and the other is to provide power for the circuit formed by the thermistor 5.2, the voltage dividing resistor 5.1 and the ground. Filtered and stabilized DC constant voltage source. the

The operating principle of the battery charging circuit of the present invention is as follows. the

Since the power supply system 1 outputs a constant current source, the resistance of the thermistor 5.2 has a linear relationship with the temperature, so the voltage drop across the thermistor 5.2 also has a linear relationship with the temperature. The single-chip microcomputer 4 converts the temperature signal (specifically, the voltage drop on the thermistor 5.2) collected by the temperature acquisition module 5 into a digital signal through its own analog-to-digital converter, and digitally processes the digital signal to generate data. Compare with the temperature range value set in the single chip microcomputer 4 (set in this embodiment is 0 degrees to 65 degrees), to determine whether the temperature collected by the temperature acquisition module 5 is within the preset temperature range. If the collected temperature is within the preset temperature range, the single chip microcomputer 4 sends a signal to control the switch unit 3 to open, otherwise the control switch unit 3 is closed. Because the switch unit 3 is connected between the power supply system 1 and the battery 2, the opening or closing of the switch unit 3 directly determines whether the battery 2 is charged or not. the

The above description is inspired by the ideal embodiment of the utility model, through the above description, relevant staff can make various changes and modifications within the scope of not departing from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims. the

Claims (3)

1. battery charger; Comprise power-supply system (1) and battery (2); It is characterized in that: the temperature collect module (5) that also comprises the switch element (3) that is connected between power-supply system (1) and the battery (2), is used for the single-chip microcomputer (4) that control switch unit (3) opens or closes and is used for collecting temperature and send into single-chip microcomputer (4); Single-chip microcomputer (4) links to each other with switch element (3), and the signal output part of temperature collect module (5) links to each other with single-chip microcomputer (4).

2. battery charger according to claim 1; It is characterized in that: said temperature collect module (5) comprises a divider resistance (5.1) and a thermistor (5.2); One end ground connection of thermistor (5.2); The other end links to each other with power-supply system (1) with divider resistance (5.1) serial connection back, and the other end of thermistor (5.2) also links to each other with single-chip microcomputer (4) as the signal output part of temperature collect module (5).

3. battery charger according to claim 2 is characterized in that: the model of said thermistor (5.2) is NCP15XQ681J0SRC.

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