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2024
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07
A pre-protection chip is a chip used to provide advance protection for circuits or devices.
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A pre-protection chip is a chip used to pre-protect a circuit or device. Here is some information about it:
Functions and Features
- Overvoltage Protection ：It can monitor the input voltage. When the voltage exceeds the set threshold, it automatically disconnects the circuit or takes other protective measures to prevent overvoltage damage to downstream circuit components. For example, the 4054H charging management chip has a built-in pre-OVP protection function, and can still work normally when the input voltage reaches 32V, effectively preventing battery overcharge and charger damage. 。
- Overcurrent Protection ：It monitors the current in the circuit in real time. Once the current exceeds the safe value, it quickly limits the current or disconnects the circuit, avoiding problems such as overheating and short circuits caused by overcurrent, protecting the chip and other devices from overcurrent impact. For example, the Chuangxinwei CM13xx series chips use a built-in high-precision current detection circuit to achieve overcurrent discharge, short-circuit, and overcurrent charging protection functions.
- Overheat Protection ：It has a built-in temperature sensor or works with an external temperature detection component to monitor the temperature of the chip itself or its surrounding environment. When the temperature is too high, it automatically reduces the operating frequency, reduces the current, or disconnects the circuit to prevent the chip from degrading in performance, being damaged, or even causing safety accidents due to overheating. Like the 4054H charging management chip, after continuous charging for 4 hours, it can keep the surface temperature within a safe range through a built-in thermistor and temperature protection mechanism. 。
- Reverse Polarity Protection ：It prevents damage to the circuit when the polarity of the power supply is reversed. When the power supply is reversed, the chip can prevent current from passing through or take other measures to protect downstream circuit components from the effects of reverse voltage.
Application Scenarios
- Charging Equipment ：Such as mobile phone chargers, mobile power supplies, car chargers, etc. Taking mobile phone chargers as an example, the pre-protection chip can prevent overvoltage and overcurrent problems caused by input voltage fluctuations or improper charging cable connections, protecting the mobile phone battery and charging circuit safety.
- Battery Management System ：Used for protection of various lithium batteries, nickel-hydrogen batteries, etc. For example, Chuangxinwei's lithium battery protection IC is widely used in battery management in mobile phones, wearable devices, and Bluetooth speakers, detecting the battery voltage and current to achieve overcharging, over-discharging, and overcurrent protection, extending battery life and ensuring safe use. 。
- Electronic Devices ：Such as laptops, tablet computers, digital cameras, etc. The pre-protection chip can protect the internal circuits of these devices from abnormal power supplies and electrostatic discharge, improving the stability and reliability of the equipment.
- Industrial Control ：In industrial automation equipment, robots, power systems, and other industrial fields, the pre-protection chip can protect various sensors, actuators, controllers, and other devices, ensuring that industrial equipment operates stably under complex electromagnetic environments and power supply conditions.
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