CN211180128U

CN211180128U - Battery low-voltage alarm circuit

Info

Publication number: CN211180128U
Application number: CN201921492585.8U
Authority: CN
Inventors: 何光明; 李克俭; 何凯翔; 武显平; 黄平江
Original assignee: Sichuan Ouo Technology Co ltd
Current assignee: Sichuan Ouo Technology Co ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-08-04
Anticipated expiration: 2029-09-09

Abstract

The utility model relates to the technical field of electrical design, in particular to a battery low-voltage alarm circuit, which comprises a storage battery, a photoelectric isolator, a voltage signal acquisition module, a data selection module, a singlechip and an alarm; the photoelectric isolator is used for isolating input and output electric signals; the voltage signal acquisition module is used for sampling/holding a voltage signal; the singlechip is used for collecting the voltage value and judging the voltage value. The utility model discloses can inspect the magnitude of voltage of battery, the trouble that the prediction probably appears, reduce because of the waste that can't judge that all batteries caused of changing, the cost is increased, singlechip and alarm through setting up, it is complicated to have solved among the battery voltage detection interference factor, a difficult problem such as measurement accuracy is difficult to control, it is more accurate to make battery voltage measure, and can maintain and maintain the battery as early as possible, reach extension battery life, improve the purpose of battery stability.

Description

Battery low-voltage alarm circuit

Technical Field

The utility model relates to an electrical design technical field specifically is a battery low pressure warning circuit.

Background

A secondary battery is a device for directly converting chemical energy into electrical energy, and is a battery designed to be rechargeable, and recharging is achieved through a reversible chemical reaction, and is generally referred to as a lead-acid battery, which is one of batteries and belongs to a secondary battery. The working principle is as follows: when the battery is charged, the internal active substance is regenerated by using external electric energy, the electric energy is stored into chemical energy, and the chemical energy is converted into electric energy again to be output when the battery needs to be discharged, such as a mobile phone battery and the like which are commonly used in life.

Most of the existing electronic products adopt a plurality of storage batteries to be used in series, and after the electronic products are used for a period of time, if the voltage of one battery is too low, the waste caused by replacing all the storage batteries due to the failure of judgment is caused, and the cost is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery low pressure warning circuit to solve certain or some problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a battery low-voltage alarm circuit comprises a storage battery, a photoelectric isolator, a voltage signal acquisition module, a data selection module, a single chip microcomputer and an alarm; the photoelectric isolator is used for isolating input and output electric signals; the voltage signal acquisition module is used for sampling/holding a voltage signal; the data selection module is used for inputting the obtained signals to an input port of 80C196A/D conversion, and converting analog quantity into digital quantity for reading; the single chip microcomputer is used for collecting voltage values and judging the voltage values.

Preferably, the rated voltage of the storage battery is 9-12V.

Preferably, the voltage signal acquisition module adopts an AD582 sampling/holding device.

Preferably, the data selection module adopts a multi-way switch CD4067, and the singlechip adopts an AT89C52 singlechip.

Preferably, the output end of the multi-way switch CD4067 is electrically connected with the pin P3.6 end of the AT89C52 single chip microcomputer through a lead, and the AT89C52 single chip microcomputer is externally connected with an alarm circuit.

Preferably, the alarm circuit comprises an alarm and an S8050 triode, one end of the alarm is connected with the VCC end of the AT89S52 singlechip, the other end of the alarm is connected with the output end of the S8050 triode, and the input end of the S8050 triode is electrically connected with the P0.6 end of a pin of the AT89S52 singlechip through a 5K resistor.

Compared with the prior art, the beneficial effects of the utility model are that:

1. this battery low pressure warning circuit can inspect the voltage value of battery, the trouble that the prediction probably appears, reduce the waste because of unable judgement changes all batteries and cause, the cost is increased, singlechip and alarm through setting up, it is complicated to have solved among the battery voltage detection interference factor, difficult problems such as measurement accuracy is difficult to control, make battery voltage measurement more accurate, and can maintain and safeguard the battery as early as possible, reach extension battery life, improve the purpose of battery stability.

2. The battery low-voltage alarm circuit presets a lowest value of battery voltage on an AT89S52 singlechip, isolates output signals of a storage battery through a photoelectric isolator, samples/holds voltage signals by adopting an AD582 sampling/holding device, inputs the obtained signals to an input port of 80C196A/D conversion through a multi-way switch CD4067 in the circuit, and converts analog quantity into digital quantity for reading. The digital quantity is transmitted into the AT89S52 single chip microcomputer, the AT89S52 single chip microcomputer analyzes and processes the digital quantity, and when the acquired voltage value is smaller than a preset value, the AT89S52 single chip microcomputer controls the alarm to give an alarm through the driving circuit.

Drawings

FIG. 1 is a schematic diagram of the present invention;

fig. 2 is a schematic circuit diagram of the AD582 of the present invention;

FIG. 3 is a schematic structural diagram of the alarm circuit of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides the following technical solutions:

a battery low-voltage alarm circuit is shown in figure 1 and comprises a storage battery, a photoelectric isolator, a voltage signal acquisition module, a data selection module, a single chip microcomputer and an alarm; the photoelectric isolator is used for isolating input and output electric signals; the voltage signal acquisition module is used for sampling/holding a voltage signal; the data selection module is used for inputting the obtained signal to an input port of 80C196A/D conversion, and converting the analog quantity into digital quantity for reading; the singlechip is used for collecting the voltage value and judging the voltage value.

It is worth noting that the photoelectric isolator is added, and the power supply is isolated by adopting the independent power supply, so as to protect the monitoring system, and the power supplies used by the input end and the output end of the photoelectric isolator can not be grounded, otherwise, the isolation effect can not be achieved.

It is worth noting that the nominal voltage of the battery is 9-12V.

Specifically, the data selection module adopts a multi-way switch CD4067, and the singlechip adopts an AT89C52 singlechip.

Voltage of accumulator	Judgment criteria
		< 10.8V (before use)	Too low
10.8-11.8V (before use)	Is on the low side
		11.8-12.8V (before use)	Is normal
12.8-13.2V (when in use)	Too low
		13.2-14.8V (when in use)	Is normal
> 14.8V (in use)	Too high

Furthermore, the voltage signal acquisition module adopts an AD582 sampling/holding device, and during voltage measurement, the AD582 sampling/holding device is adopted to sample/hold the voltage signal, and then the obtained signal is input to an input port of 80C196A/D conversion through a multi-way switch CD4067 in the circuit, so that the analog quantity is converted into the digital quantity for reading. AD582 is a feedback sample/hold, and when the accuracy requirement is not too high (0.1% of the earth) and the speed requirement is high, C ═ 10OpF can be chosen, where the capture time is less than 6 μ s, and if higher accuracy is required, the additional holding capacitance can be 1000 pF. The AD582 sample/holder is not available as an amplifier during sampling as shown in fig. 2. The normal working voltage range of the single storage battery is 1.97-2.15V, and if the single storage battery is not in the range, the system automatically alarms. In order to ensure that the measured voltage value is most accurate within the input range allowed by the AT89C52 singlechip, reasonable RF and Rf values are selected.

In addition, the output end of the multi-way switch CD4067 is electrically connected with the pin P3.6 end of the AT89C52 single chip microcomputer through a lead, and the AT89C52 single chip microcomputer is externally connected with an alarm circuit.

It should be noted that, as shown in fig. 3, the alarm circuit includes an alarm and an S8050 triode, one end of the alarm is connected to the VCC terminal of the AT89S52 singlechip, the other end is connected to the output terminal of the S8050 triode, the input terminal of the S8050 triode is electrically connected to the pin P0.6 terminal of the AT89S52 singlechip through a 5K resistor, and the S8050 triode can play a role in amplifying a current signal, so that the alarm can effectively work.

When the battery low-voltage alarm circuit is used, a lowest value of battery voltage is preset on an AT89S52 singlechip, an output signal of a storage battery is isolated through a photoelectric isolator, an AD582 sampling/holding device is used for sampling/holding a voltage signal, the obtained signal is input to an input port of 80C196A/D conversion through a multi-way switch CD4067 in the circuit, and analog quantity is converted into digital quantity to be read. The digital quantity is transmitted into the AT89S52 single chip microcomputer, the AT89S52 single chip microcomputer analyzes and processes the digital quantity, and when the acquired voltage value is smaller than a preset value, the AT89S52 single chip microcomputer controls the alarm to give an alarm through the driving circuit.

The utility model discloses a battery low-voltage warning circuit can inspect the magnitude of voltage of battery, the trouble that the prediction probably appears, reduce because of the waste that can't judge and change all batteries and cause, the cost is increased, singlechip and alarm through setting up, it is complicated to have solved among the battery voltage detection interference factor, difficult problems such as measurement accuracy is difficult to control, it is more accurate to make battery voltage measure, and can maintain and maintain the battery as early as possible, reach extension battery life, the purpose of improvement battery stability.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and the present invention can also have various changes and modifications, which fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A battery low voltage warning circuit, characterized by: the device comprises a storage battery, a photoelectric isolator, a voltage signal acquisition module, a data selection module, a single chip microcomputer and an alarm; the photoelectric isolator is used for isolating input and output electric signals; the voltage signal acquisition module is used for sampling/holding a voltage signal; the data selection module is used for inputting the obtained signals to an input port of 80C196A/D conversion, and converting analog quantity into digital quantity for reading; the single chip microcomputer is used for collecting voltage values and judging the voltage values.

2. The battery low voltage alarm circuit of claim 1, wherein: the rated voltage of the storage battery is 9-12V.

3. The battery low voltage alarm circuit of claim 1, wherein: the voltage signal acquisition module adopts an AD582 sampling/holding device.

4. The battery low voltage alarm circuit of claim 1, wherein: the data selection module adopts a multi-way switch CD4067, and the singlechip adopts an AT89C52 singlechip.

5. The battery low voltage alarm circuit of claim 4, wherein: the output end of the multi-way switch CD4067 is electrically connected with the pin P3.6 end of the AT89C52 single chip microcomputer through a lead, and the AT89C52 single chip microcomputer is externally connected with an alarm circuit.

6. The battery low voltage alarm circuit of claim 5, wherein: alarm circuit includes alarm and S8050 triode, and the VCC end of one end and AT89S52 singlechip of alarm is connected, and the other end is connected with S8050 triode output, and the input of S8050 triode passes through 5K resistance and the pin P0.6 end electric connection of AT89S52 singlechip.