Automatic adjusting, protecting and detecting circuit for power supplying device

Abstract

The invention relates to an automatic adjusting, protecting and detecting circuit for a power supplying device. A first impedance unit is coupled to the output end of the power supplying device and generates an output voltage according to the negative current of the power supplying device. A second impedance unit is coupled to the output end of the power supplying device and generates a reference voltage. A comparing unit is coupled to the first and second impedance units, and generates a protective signal based on the output voltage and the reference voltage to stop the power supplying device. An adjusting unit is coupled to a second impedance unit and the comparing unit and adjusts the voltage so as control the protective signal output by the comparing unit. In this way, the voltage is adjusted through the adjusting unit, and a protective signal is controlled to be output by a comparing unit, thereby protecting the product.

Description

technical field [0001] The invention relates to a protection detection circuit, in particular to a protection detection circuit of a power supply. Background technique [0002] No matter inside the computer or other electrical appliances, there is usually a power protection circuit to detect the stability of the system power supply, and when the system power supply is abnormal, activate the protection mechanism in time, or turn off the power supply, or send out a warning signal , so that the system can minimize the damage when the power supply is abnormal. For high-end electronic products, such as computers, power protection mechanisms are indispensable. [0003] In the field of power supplies, the protection circuit of the output voltage or output current of the power supply is a very important function, which can avoid permanent damage to the product caused by the improper output voltage or current of the power supply. The protection functions of the general protection c...

AI Technical Summary

Problems solved by technology

The cost of the primary side detection method is low, but it cannot achieve accurate protection, while the secondary side detection method has high accuracy and relatively high cost

However, after careful analysis of the accuracy, the overload protection detected by the secondary side also has a very large error. In the case of no adjustment, there is about a 20% error range, which depends on the accuracy of various protection parameters, such as reference voltage. , reference current, layout, the size of the sampling resistor, etc., so when accurate protection is required, the production line needs to manually adjust the protection parameters, and the production line is usually adjusted by variable resistors. The disadvantages of the method include factors such as time-consuming and poor stability of the variable resistor.

[0005] Therefore, how to propose a novel power supply protection detection circuit for the above problems, which can avoid manual adjustment of protection parameters to save man-hours, and does not need to adjust parameters in a variable resistance manner to avoid possible The factor of poor stability of variable resistance can solve the above problems

Images