UPS automatic heating circuit

Abstract

The invention relates to a UPS automatic heating circuit. The circuit comprises a temperature detection and voltage division circuit, a comparison circuit, a heating cut-off circuit and a heating unit. The temperature detection and voltage division circuit is connected with the comparison circuit to be used for generating different voltages according to external temperature change resistances and transmitting the voltages to the comparison circuit. The comparison circuit is connected with the temperature detection and voltage division circuit and the heating cut-off circuit to be used for comparing the voltages with preset values of the temperature detection and division circuit and transmitting high-and-low-level signals to the heating cut-off circuit. The heating cut-off circuit is connected with the comparison circuit and the heating unit to be used for receiving the high-and-low-level signals transmitted by the comparison circuit and control the on and off of the heating unit according to signals. The heating unit is used for heating the UPS to improve UPS and battery temperatures. By means of the circuit, the UPS is heated automatically when the UPS is at the low temperatures, starting can be performed automatically when the mains supply is discharged off, the UPS use efficiency and the battery service life can be improved, and the load back-up time is prolonged.

Description

technical field [0001] The invention relates to the technical field of UPS, in particular to a UPS automatic heating circuit. Background technique [0002] UPS, uninterruptible power supply, is a system device that connects batteries (mostly lead-acid maintenance-free batteries) with the host, and converts direct current into commercial power through modular circuits such as the host inverter. It is mainly used to provide stable and uninterrupted power supply to a single computer, computer network system or other power electronic equipment. When the mains input is normal, the UPS will stabilize the mains and supply it to the load. At this time, the UPS is an AC mains voltage stabilizer, and it also charges the battery inside the machine; when the mains is interrupted (accident power failure) , the UPS will continue to supply 220V AC power to the load through the zero-switching conversion method of the DC power of the battery immediately, so as to maintain the normal operati...

AI Technical Summary

Problems solved by technology

[0003] Some UPSs work outdoors. When the outdoor UPS is below minus 10 degrees, many UPSs cannot start automatically after the battery is discharged (the UPS will automatically turn on when the battery is discharged and the mains is supplied), and the user must Artificial start-up reduces the use efficiency and increases labor costs; moreover, when the weather is low, the battery discharge time is greatly shortened, which affects the customer's load backup time and battery life.

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