Charging input protection device and charging overvoltage and over-temperature protection method thereof

Abstract

The invention discloses a charging input protection device and a charging overvoltage and over-temperature protection method thereof. The device comprises a charger and a charging protection circuit, and the charging protection circuit comprises a single-chip microcomputer control unit and an input voltage sampling unit. The single-chip microcomputer control unit is connected to an input voltage positive electrode of the charging input port and can control on-off of the input voltage positive electrode switch unit. The single-chip microcomputer control unit is further connected to an input voltage negative electrode of the charging input port and can control on-off of the input voltage negative electrode switch unit. A sampling terminal of the input voltage sampling unit is connected to an input voltage positive electrode, a sampling voltage output end of the input voltage sampling unit is connected to the single-chip microcomputer control unit, and the input voltage sampling unit is used for sampling input voltage, connected to a charged electronic product, of the charger and sending the collected voltage to the single-chip microcomputer control unit. According to the invention, damage to power supply of a rear-end circuit due to misuse of an overvoltage adapter can be effectively and reliably avoided.

Description

technical field [0001] The invention relates to pet training products, in particular to a charging input protection device and a charging overvoltage and overtemperature protection method for the device. Background technique [0002] At present, after many rechargeable electronic products are returned from after-sales or end users, it is found through analysis that the reason is that the product is damaged by an adapter exceeding its rated charging voltage. Because the adapters have different nominal output voltages, for example, the common ones are 5V for mobile phone adapters, 9V for digital camera adapters, 12V for router adapters, and 18V for vacuum cleaner adapters. But the charging port of these chargers is often used the same. Many consumers can’t tell the difference or don’t know how to use it. It’s possible to use an adapter with a high output voltage to charge a product with a low input voltage. For example, use an adapter above 9V to directly charge a 5V electron...

AI Technical Summary

Problems solved by technology

However, it takes a certain amount of time for the voltage stabilizing device to stabilize from high voltage to low voltage. During this voltage stabilizing process, some voltage-sensitive electronic components in the back-end electronic products may be damaged by breakdown and cannot be fully and effectively protected.

[0006] In addition, the voltage stabilizing device needs to consume power when stabilizing the voltage. If the power consumption is greater than the rated power consumption of the voltage stabilizing device, the voltage stabilizing diode will be damaged by open circuit or short circuit, and the subsequent circuit cannot be protected.

In addition, although some products also have a protective switch on the positive line, when the positive and negative poles of the charger are reversed, it is still possible for the charged electronic product to be connected to live or leakage or static electricity, resulting in damage (such as figure 2 shown)

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