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Battery undervoltage detection circuit

A detection circuit and undervoltage technology, which is applied in the circuit field, can solve the problems of complex battery undervoltage detection circuit and poor accuracy, and achieve simple circuits and complex solutions

Active Publication Date: 2015-10-07
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a battery undervoltage detection circuit to solve the problems of complex and poor accuracy of the battery undervoltage detection circuit

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Embodiment Construction

[0022] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other if there is no conflict. Hereinafter, the present invention will be described in detail with reference to the drawings and in conjunction with the embodiments.

[0023] figure 1 It is a schematic diagram of the battery undervoltage detection circuit according to the first embodiment of the present invention, such as figure 1 As shown, the circuit includes: a DC power supply to supply power to the battery undervoltage detection circuit; a voltage divider circuit 30, the first terminal is used to connect to the battery 10 to collect the voltage of the battery 10; a voltage reference source 40, the first terminal is connected to the The second end of the voltage circuit 30 is connected; and an amplifying circuit 50, the first end of which is connected to the second end of the voltage reference source 40, the amplifying circuit 50 is used to amplify the...

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Abstract

The invention provides a battery undervoltage detecting circuit which comprises a voltage division circuit, a voltage reference and an amplifying circuit. A first end of the voltage division circuit is connected with a battery to acquire voltage of the battery. A first end of the voltage reference is connected with a second end of the voltage division circuit. A first end of the amplifying circuit for amplifying detecting signals from the voltage reference is connected with a second end the voltage reference. A second end of the amplifying circuit outputs the amplified detecting signals. By the battery undervoltage detecting circuit, whether undervoltage of the battery occurs or not can be accurately detected through a simple circuit.

Description

Technical field [0001] The invention relates to the field of circuits, and in particular to a battery undervoltage detection circuit. Background technique [0002] In battery-powered equipment, over-discharge of the battery usually leads to a decrease in battery life. The system main control chip usually needs to monitor whether the battery is over-discharged, and then control the charging circuit to charge the circuit, or take protective measures (such as disconnecting the load). During the battery discharge process, the voltage will gradually drop, so it can be determined whether the battery is over-discharged by detecting the battery undervoltage. [0003] The traditional detection method is to collect the battery voltage through the A / D sampling function of the MCU. Because the MCU itself is powered by a battery, the reference voltage of the A / D sampling is related to the battery voltage, so the voltage cannot be accurately collected. [0004] In order to collect the voltage a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 李发顺陈绍林李文灿游剑波周伟
Owner GREE ELECTRIC APPLIANCES INC