Power supply management system circuit for converting low-power-consumption lithium battery into U-shaped battery

Abstract

The invention provides a power supply management system circuit for converting a low-power-consumption lithium battery into a U-shaped battery and relates to the application field of replacing an AA type alkaline battery with a lithium battery, and the circuit comprises a BUCK circuit unit and a lithium battery charging circuit unit, the BUCK circuit unit is provided with a PWM logic control module; a third input end of the PWM logic control module is connected with a lithium battery interface BAT + through a voltage stabilizer, and two output ends of the PWM logic control module are connectedwith a 1.5 V output port VO + of the BUCK circuit unit through a circuit. The circuit is characterized in that the second input end of the PWM logic control module is connected with the amplificationcomparison module; the amplification comparison module is used for amplifying the difference between the VO + end voltage and the reference voltage controlled by the BAT + voltage, comparing the amplified difference with triangular waves generated by the oscillator, converting a comparison result into a variable pulse width and outputting the variable pulse width to the PWM logic control module.The power supply management system circuit for converting the lithium battery into the U-shaped battery can solve the problems in the background technology.

Description

technical field [0001] The invention relates to the application field of lithium batteries replacing AA-type alkaline batteries, in particular to a power management system circuit for converting a low-power lithium battery into a U-shaped battery. Background technique [0002] BUCK is one of the basic topologies of DC-DC. It mainly realizes step-down conversion from DC to DC. Usually, a PWM logic circuit is required to control the turn-on of two MOS tubes to realize voltage conversion. The duty cycle of the PWM logic circuit adjusts the DC output. electrical, functional block diagram as figure 1 As shown, when the upper switch is turned on, the power supply at the input end charges and stores energy to the load and the inductor L1 through the high switch and the inductor L1. The inductor L1 is equivalent to a constant current source, which plays the role of transferring energy. The voltage source acts as a smoothing filter in the circuit; when the upper high switch is turne...

AI Technical Summary

Problems solved by technology

The main disadvantages of this traditional method are: 1. The VO+ output voltage cannot simulate the output voltage curve of the alkaline AA battery, and the application system cannot correctly sense the power loss state of the battery

2. The no-load power consumption of this traditional BUCK line is relatively large, which greatly reduces the standby time

3. The charging method is single, and can only be charged by ADP

4. Does not have temperature detection and protection functions

In addition to the similar shortcomings of the traditional method 1, the traditional method 2 takes up a relatively large volume of PCBA, and the product structure design is more difficult, squeezed into the available physical space of the lithium battery, and the battery conversion efficiency is low

Images