Circuit system for providing stable voltage variable constant current output

Abstract

This invention discloses a circuit system for providing a variable voltage regulation constant output, which can reduce the cost of a circuit system providing the voltage regulation variable constant current output and reduce its power loss while the limit of chips is not rigorous such as in a fixed table.In this invention, PWM kind switch supply chips are used to provide negative feed backs of voltage and current by its internal two error amplifiers to realize output of constant current voltage and alter the volume of the constant current by altering the reference voltage of the current negative feed back loop by the control signal.

Description

technical field [0001] This invention relates to circuitry, and more particularly to circuitry associated with power supply. Background technique [0002] Power supply is an integral part of electronic and electrical equipment. With the advancement of battery technology and the reduction of cost, many electronic and electrical equipment use batteries as power or backup power. As a reusable power source, rechargeable batteries have been developed rapidly. There are many different types of rechargeable batteries, such as lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, etc. Among them, the lithium-ion battery has the advantages of small size, light weight, low self-discharge rate, and no memory effect, and has been widely used. [0003] The capacity of a rechargeable battery (Capacity, referred to as "C") is generally calculated in milliampere-hours (mAh), and CmAh capacity means that the capacity of the battery is equivale...

AI Technical Summary

Problems solved by technology

[0012] In practical application, the above solution has the following problems: the existing technical solution has high requirements on the external power adapter, high implementation cost, and high power consumption

[0013] The main reason for this situation is that because the LDO has relatively high requirements for the stability of the input voltage, it needs to use a dedicated external power adapter with high cost, and because the LDO is used in a relatively special occasion, the output is not very large, and its cost is also high. Higher, resulting in higher cost of the existing technical solutions; In addition, because the constant current of different sizes in the existing technical solutions uses different channels, increasing the number of devices, considering that adding devices will increase additional power consumption, so now The power consumption of the technical circuit system is relatively large

Images