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Protection circuit

A technology for protecting circuits and energizing paths, which is applied in the direction of safety/protection circuits, emergency protection circuit devices, circuits, etc., and can solve problems such as disconnected fuses, unusable equipment, and malfunctions

Pending Publication Date: 2021-09-07
DEXERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Here, semiconductors constituting ICs or FETs have the risk of malfunctioning due to noise generated inside the device or noise intruding from the outside
For example, in the protective circuit using a lithium-ion battery as described above, if the voltage detection IC for monitoring the overvoltage malfunctions, the fuse with the heater may accidentally open and the device may fail. state of use

Method used

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Embodiment Construction

[0047] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0048] figure 1 It is a circuit diagram schematically showing the configuration of the protection circuit according to the first embodiment of the present invention. In this embodiment, a protection circuit for a battery pack mounted in a mobile device such as a mobile phone will be described as an example.

[0049] like figure 1 As shown, the protection circuit 2A is provided with: a protection element 10, which has a fusible metal body 11 connected to the conduction path in the battery pack 1, and a fusible metal body 11 connected to the fusible metal body 11 and capable of melting the fusible metal body 11 by heating. Heating body 12; Detect abnormal protection device 20 of the battery 3 (equipment) connected to the above-mentioned energization path; operate according to the detection result of protection device 20, to energize the switching element 30 to the he...

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Abstract

Provided is a protection circuit that can realize a downsizing of a device with a simple configuration while reliably suppressing noise, and also reduce the effect of noise on a human body. The protection circuit (2A) comprises a protection element (10) having a fusible metal body (11) connected on an energization path in a battery pack (1), and a heating element (12) that is connected to the fusible metal body (11) and enables disconnection by heating the fusible metal body (11); a protection device (20) for detecting an abnormality of a battery (3) connected to the energization path; a switching element (30) that operates so as to energize the heating element (12) of the protection element (10) on the basis of the detection result of the protection device (20); and a frequency selection element (40) that is connected in parallel with the switching element (30) and passes noise in a predetermined frequency band.

Description

technical field [0001] The present invention relates to a protection circuit, for example, to a protection circuit provided in a charging and discharging circuit of a secondary battery. [0002] This application claims priority based on Japanese Patent Application No. 2019-017085 filed in Japan on February 1, 2019, and the content thereof is hereby cited. Background technique [0003] At present, protective circuits are installed in various devices equipped with secondary batteries, such as mobile devices such as mobile phones and portable computers, and rechargeable electric devices. As a protection circuit for a battery pack equipped with a lithium ion secondary battery, for example, a structure in which a heater-equipped fuse composed of a fuse element and a heater is connected to a charging and discharging circuit of the battery pack is known. [0004] In the protection circuit described above, when an abnormality such as overcharging occurs, the detection element sudde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/18H01M10/42H01M10/48H02J7/00
CPCH02J7/00H01M10/48H02H7/18H01M10/42Y02E60/10H02J7/0031G01R31/3835
Inventor 小森千智
Owner DEXERIALS CORP