AC/DC converter for low-power microcircuit system
A converter and microcircuit technology, applied in the field of microcircuits, can solve problems such as inability to output low voltage, inability to adapt to power changes, etc., and achieve the effect of ensuring circuit safety
Active Publication Date: 2021-08-17
ZHUZHOU HONGDA MICROELECTRONICS TECH CO LTD
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Problems solved by technology
[0007] However, the inventors found that the existing AC / DC converters still have relatively large defects in safety protection and feedback control, especially in the application of low-power microcircuits, the existing AC / DC converters cannot adapt to power changes demand, can not output stable low voltage
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[0024] In the following, the invention will be further described in conjunction with the accompanying drawings and specific embodiments.
[0025] Before introducing various embodiments, the basic concept of switching power supply is firstly introduced, so as to have a better understanding of related prior art and improvements of the present invention.
[0026] Switching power supply is a power supply that uses modern power electronics technology to control the on and off of the power tube, and adjusts the on-off time ratio according to the feedback signal to keep the output stable.
[0027] According to the control method, the switching power supply mainly realizes stable output by adjusting the conduction duty cycle of the power MOS. There are two ways to adjust the duty cycle:
[0028] Pulse Width Modulation (PWM): It is to keep the switching frequency of the switch tube constant, and adjust the duty cycle by changing the conduction time, so as to achieve the purpose of sta...
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The invention provides an AC / DC converter for a low-power microcircuit system. The AC / DC converter comprises an input circuit, a conversion circuit, an output circuit, a sampling circuit, a power factor correction circuit, a feedback circuit, a front control circuit, a first protection circuit and a second protection circuit; the first protection circuit is connected with the input circuit. The second protection circuit is connected with the output circuit and the feedback circuit. The feedback circuit comprises a first feedback branch and a second feedback branch; the first feedback branch is connected with the first protection circuit, and the second feedback branch is connected with the second protection circuit; and the front control circuit is connected with the input circuit and the conversion circuit. And the power factor correction circuit is connected with the output circuit and is used for detecting the power of load equipment connected with the output circuit so as to correct the output voltage detected by the second protection circuit. According to the converter, multiple protection circuits are matched with multiple feedback circuits, so that the output voltage is stable, and the working safety of the converter is ensured.
Description
technical field [0001] The invention belongs to the technical field of microcircuits, and in particular relates to an AC / DC converter used in a low-power microcircuit system. Background technique [0002] AC / DC converter, also known as AC / DC switching power supply or AC / DC switching circuit, converter, conversion circuit, etc., hereinafter referred to as switching power supply. [0003] Switching power supply is a power electronic device that is widely used in consumer electronics such as mobile phones and MP3, as well as aerospace and other fields. This is because the electronic system needs the power system to provide energy. Most of the electric energy in daily life comes from the mains (high voltage alternating current). However, electronic systems have different requirements for power supplies. For example, current small electronic systems often require low-voltage DC power supplies of 1V to 5V for power supply. Therefore, under normal circumstances, the commercial p...
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IPC IPC(8): H02M7/217H02H7/125
CPCH02M7/217H02H7/125H02H7/1252
Inventor 彭俊新李光李启波王慧卉
Owner ZHUZHOU HONGDA MICROELECTRONICS TECH CO LTD