Current detection method

Abstract

A current detection method using a pulse width modulation controller with an input power processing unit, a main inductor, a switching element, a current sensing resistor, an output rectifier, and an output filter to convert an AC input power into a rectified input power and an output power supply, and the output power supplies power to the external load. When the switching element is turned on, the peak conduction current can be detected by the current sensing signal, and the input voltage of the rectified input power supply can be calculated according to the inductance value of the main inductor and the conduction time. Then, the switching element is turned off and does not conduct , the current sensing signal can be used to detect the zero time when the conduction current drops to zero, and the output voltage can be calculated in accordance with the inductance value and the input voltage. Therefore, a voltage divider that does not require a resistor is invented, and the power consumption under no load can be greatly improved.

Description

Technical field [0001] The present invention relates to a current detecting method, in particular, according to the sensing signal at the time of opening / closing, according to the switching element, then via the calculation to obtain the input voltage and the output voltage, there is no need to reduce the powerless power Consumption, and improve the overall electrical operation efficiency. Background technique [0002] With the continuous advancement of technology, different electrical / electronic devices are to operate at specific operating voltages. For example, an integrated circuit (IC) is typically powered by 5V, 3V or 1.8V, or DC motor requires 12VDC, and the high power device requires 110V or 220V AC electrical electricity. In particular, the lamp tube of the LED indicator is often required to operate at a higher operating voltage. Therefore, many types of power converters or inverters have been developed to meet different needs. [0003] In addition, the design of powe...

AI Technical Summary

Problems solved by technology

[0005] Obviously, PFC designs and flyback converters require two voltage dividers, especially two resistive voltage dividers, which will result in higher power dissipation, especially under no-load conditions

Due to power saving considerations, more stringent power consumption requirements will be imposed on electronic / electrical devices, and resistive voltage dividers are essentially difficult to meet the upcoming efficiency standards

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