Multi-voltage output control circuit of smart charger

Abstract

The invention relates to a multivoltage output control circuit for an intelligent changer. The multivoltage output control circuit comprises a single chip microcomputer, an integrating circuit, a reference voltage generating circuit and a voltage output module, wherein the single chip microcomputer is used for generating a PWM signal according to the type of a battery or the environmental temperature of the intelligent charger, the integrating circuit is used for converting the PWM signal into the first voltage signal, the reference voltage generating circuit is used for converting the first voltage signal into a second voltage signal, and the voltage output module is used for outputting battery charging voltage according to the second voltage signal. The multivoltage output control circuit uses the single chip microcomputer to change the duty ratio of the PWM signal to change a voltage signal output by the reference voltage generating circuit, so that the battery charging voltage output by the intelligent charger is changed, and the purpose of saving resources of an I / O interface of the single chip microcomputer is achieved.

Description

technical field [0001] The invention relates to a multi-voltage output control circuit of an intelligent charger. Background technique [0002] At present, most of the existing smart chargers mostly use a single-chip microcomputer (Micro Control Unit, MCU) for charging management and control. Some smart chargers are also required to be suitable for a variety of batteries, or the charging limit voltage of the same battery in different temperature ranges is different. In order to meet this demand, most smart chargers set voltage divider resistors to switch multiple reference voltages to meet the requirements. [0003] like figure 1 Shown is the multi-voltage output control circuit of the current smart charger, which includes a single-chip microcomputer for selecting one of the I / O ports to output a voltage signal according to the model of the battery or the ambient temperature of the smart charger, and the I / O port of the single-chip microcomputer. A voltage output circuit ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a multi-voltage output control circuit of an intelligent charger, which can solve the problem of occupying the I / O port resources of a single-chip microcomputer

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