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AC-DC converter and AC-DC conversion system

A technology of AC-DC converters and rectifiers, which is applied in the electronic field, can solve problems such as the reduction of converter efficiency, achieve the effects of size reduction and surge protection

Active Publication Date: 2022-02-15
北京泰力控科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the above-mentioned problem that the size of the AC-DC converter is limited by the size of the capacitor and the efficiency of the converter is reduced due to the large capacitor value, the application provides an AC-DC converter and an AC-DC conversion system

Method used

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  • AC-DC converter and AC-DC conversion system

Examples

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Embodiment 1

[0033] Embodiment 1 of the present application provides an AC-DC converter without surge current protection, such as figure 2 As shown, it includes a rectifier 1, a capacitor C1, a ceramic capacitor C2, a switch Q1 and a voltage comparison circuit 2. The rectifier 1 is composed of four diodes. The rectifier 1 is used to receive AC input, and the positive pole of the capacitor C1 is connected to the positive output of the rectifier 1. terminal, the negative pole of capacitor C1 is connected to switch Q1, which is a field effect transistor, the negative pole of capacitor C1 is connected to the drain of switch Q1, and the source of switch Q1 is connected to the negative output terminal of rectifier 1, which is also the ground of the system; The voltage comparison circuit 2 includes a differential amplifier 21 and a comparator 22, the positive pole of the capacitor C1 is connected to the positive input terminal of the differential amplifier 21 at the same time, the negative pole o...

Embodiment 2

[0038] Embodiment 2 of the present application provides an AC-DC converter with surge current protection, such as image 3 As shown, it includes a rectifier 1, a capacitor C1, a ceramic capacitor C2, a switch Q1, a voltage comparison circuit 2 and a surge protection circuit, which is the same as in Embodiment 1. The rectifier 1 and the rectifier 1 are composed of four diodes for receiving AC input. The positive pole of the capacitor C1 is connected to the positive output terminal of the rectifier 1, the negative pole of the capacitor C1 is connected to the switch Q1, the switch Q1 is a field effect transistor, the negative pole of the capacitor C1 is connected to the drain of the switch Q1, and the source of the switch Q1 is connected to the rectifier 1 The negative output terminal of the system is also the ground of the system; the voltage comparison circuit 2 includes a differential amplifier 21 and a comparator 22, the positive pole of the capacitor C1 is connected to the po...

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Abstract

The application relates to the field of electronic technology, and discloses an AC-DC converter and an AC-DC conversion system. The AC-DC converter includes: a filter, a rectifier, a capacitor C1, a switch Q1 and a voltage comparison circuit. The rectifier receives an AC input, the positive pole of the capacitor C1 is connected to the positive output terminal of the rectifier, the negative pole of the capacitor C1 is connected to the switch Q1, and the switch Q1 Connected to the negative output terminal of the rectifier, while the switch Q1 is grounded; both ends of the capacitor C1 are connected to the input terminal of the voltage comparison circuit, and the voltage comparison circuit inputs a reference voltage, and the output terminal of the voltage comparison circuit is connected to the switch Q1. At the same time switch Q1 can actively limit the input inrush current. When the AC input is connected, the switch Q1 prevents excessive current spikes from charging the capacitor C1. By detecting the moment when the AC voltage crosses zero, the system decides when to charge the capacitor C1. The AC / DC converter provided by the application reduces the size of the capacitor, thereby significantly reducing the size of the AC / DC converter.

Description

technical field [0001] The present application relates to the field of electronic technology, in particular to an AC-DC converter and an AC-DC conversion system. Background technique [0002] AC-DC converters are used to convert high-voltage AC voltages into low-voltage DC voltages, and are widely used in mobile phones and notebooks. Generally speaking, if figure 1 As shown, it includes a filter 10, a rectifier 1, and a capacitor C1. The AC-DC converter is connected with the DC-DC converter 3 that provides the required output voltage to form an AC-DC conversion system. The filter 10 is used to filter noise, the rectifier 1 converts the AC voltage into a DC voltage with a large ripple, the capacitor C1 filters the ripple, thereby providing a stable DC output, and the DC-DC converter 3 converts the DC voltage Converted to the voltage level required by the load. [0003] Key performance indicators for AC-DC converters include: size, transmitted power, and efficiency. In ord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/04H02M7/217H02M1/32H02H7/16
CPCH02M7/04H02M7/217H02M1/32H02H7/16
Inventor 王文博
Owner 北京泰力控科技有限公司