Charger with function of automatically identifying input voltage

Abstract

The invention discloses a charger with a function of automatically identifying input voltage. The charger comprises the processes as follows: a sampling circuit collects AC, rectifies the AC into first DC and divides voltage of the first DC; a control circuit controls a relay to be conducted when the voltage of the first DC is lower than preset voltage; a bridge rectifier circuit rectifiers the AC into second DC, directly transmits the second DC to a filter circuit and transmits the second DC to the filter circuit through the relay; the filter circuit filters the DC to output third DC; the control circuit controls the relay to be disconnected when the voltage of the first DC is higher than the set voltage, the bridge rectifier circuit rectifiers the AC into fourth DC and directly transmits the fourth DC to the filter circuit; and the filter circuit filters the fourth DC to output the third DC. The charger can normally work no matter that the voltage is European-standard voltage or American-standard voltage, and is efficient, energy-saving, convenient and safe to use and high in operability, and manual switching is not needed.

Description

technical field [0001] The invention relates to a charger, in particular to a charger with the function of automatically identifying input voltage. Background technique [0002] Generally, the input of a traditional battery charger is mainly composed of a single rectification and filtering, and the circuit is relatively simple. The input voltage of traditional chargers is generally in a narrow voltage range, which is not suitable for use in multiple countries. This charger can only be used in countries with the same city voltage. It is necessary to distinguish between the voltage range of European standard and American standard. If the charger of European standard voltage and American standard It is very dangerous to switch the voltage charger. At the same time, carefully check the input voltage range to prevent danger and explosion. Even if this kind of charger circuit is used, the reliability, safety and operability of the charging circuit are greatly reduced. , can easil...

AI Technical Summary

Problems solved by technology

The input voltage of traditional chargers is generally in a narrow voltage range, which is not suitable for use in multiple countries. This charger can only be used in countries with the same city voltage. It is necessary to distinguish between the voltage range of European standard and American standard. If the charger of European standard voltage and American standard It is very dangerous to switch the voltage charger. At the same time, carefully check the input voltage range to prevent danger and explosion. Even if this kind of charger circuit is used, the reliability, safety and operability of the charging circuit are greatly reduced. , can easily lead to a short circuit, resulting in damage and dangerous

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