Nickel-metal hydride battery pack charging device

Abstract

The embodiment of the invention discloses a nickel-metal hydride battery pack charging device, which comprises a constant current regulation module, wherein the constant current regulation module comprises a switching power controller, a rectification unit, a detection resistor and a differential amplification unit; a power supply is connected with nickel-metal hydride batteries sequentially by the switching power controller, the rectification unit and the detection resistor; the two ends of the detection resistor are connected to the two input ends of the differential amplification unit respectively; the output end of the differential amplification unit is connected to the switching power controller, and outputs a feedback signal to the switching power controller; and the switching powercontroller controls own operating condition according to the received feedback signal to further regulate the duty cycle of switching in the rectification unit. The device can automatically regulate the output voltage of a charging circuit and stabilize a difference between the output voltage of the charging circuit and the voltage of the nickel-metal hydride battery, thereby stabilizing a charging current. Therefore, the scheme can effectively improve the charging efficiency and reduce overall calorific value.

Description

Ni-MH battery pack charging device Technical field: The invention relates to the technical field of nickel-metal hydride batteries, in particular to a charging device for a nickel-hydrogen battery pack. Background technique: Ni-MH battery is a new type of green battery developed in the 1990s. It has the characteristics of high energy, long life, and no pollution. Therefore, it has become one of the high-tech products that countries around the world are competing to develop. With the continuous development and improvement of nickel metal hydride battery technology, various performance indicators of nickel metal hydride batteries have also been greatly improved, making them widely used in mobile communications, portable digital devices, power tools and electric vehicles. When the electric quantity stored in the Ni-MH battery is lower than a certain level, it needs to be charged before it can continue to be used. At present, the industry usually uses a constant current char...

AI Technical Summary

Problems solved by technology

However, the current in most charging circuits that use constant current charging is large. With the continuous change of the voltage of the Ni-MH battery, the difference between the output voltage of the charging circuit and the voltage of the Ni-MH battery is also changing, resulting in unstable current in the charging circuit. , resulting in a large overall heat generation of the nickel-metal hydride battery charging device, and at the same time making the charging efficiency of the system lower

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