AC to DC converter

A DC converter and AC technology, applied in the direction of irreversible AC power input conversion to DC power output, high-efficiency power electronic conversion, output power conversion device, etc., can solve problems such as insufficient use, and achieve the effect of rapid discharge

Inactive Publication Date: 2010-10-27
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, with the increasing energy costs and global warming issues, the power loss requirements during standby are becoming more and more stringent, such as the requi

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Examples

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Example Embodiment

[0017] Figure 2A and Figure 2B Is a circuit diagram of an AC-to-DC converter with an X capacitor using a power factor corrector according to an embodiment of the present invention, Figure 2A and Figure 2B The difference between the circuit diagrams shown is only that the loops P21 and P22 marked with dotted lines are different. Please also refer to Figure 2A and Figure 2B The AC-to-DC converter 2 of the present invention includes an electromagnetic interference (EMI) filter 21, a rectifier filter 22, a power factor corrector (PFC) 23, and a discharge circuit 24. The AC-to-DC converter 2 receives city AC power AC from the public grid, and connects a fuse FU in series on the path of its front end coupled to the live line L or the neutral line N to prevent lightning strikes or high currents from damaging the internal circuits.

[0018] The EMI filter 21 is used to suppress the electromagnetic noise from the public power grid from being transmitted to the electronic device throu...

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PUM

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Abstract

The invention relates to an AC to DC converter. The converter comprises an electromagnetic interference filter, a rectifier filter and a discharge circuit, wherein the electromagnetic interference filter receives commercial alternating current; the rectifier filter is coupled between the electromagnetic interference filter and the discharge circuit; the electromagnetic interference filter containing a safety regulation capacitor (or X capacitor) is connected across the live line and zero line of the commercial alternating current; and the discharge circuit contains a discharge resistor, and when detecting that the commercial alternating current is removed, the discharge resistor is controlled to discharge the residual charges on the X capacitor. When the commercial alternating current is not removed, the discharge resistor has no power loss; and as the designed resistance value of the discharge resistor does not need to be very large, the residual charges on the X capacitor can be fast discharged when the commercial alternating current is removed.

Description

technical field [0001] The present invention relates to an AC-to-DC converter, and in particular to an AC-to-DC converter with X capacitance. Background technique [0002] Electronic devices that use commercial AC power, such as LCD TVs, generally require an AC-to-DC converter to convert the input commercial AC power (typical values ​​such as 90-264Vrms) into high-level DC voltages (typical values ​​such as 380-264Vrms). 400V) to provide a DC-to-DC converter to convert high-level DC voltages into different low-level DC voltages (typical values ​​such as 24V, 12V, 5V) to provide electrical power for operating electronic devices. [0003] figure 1 It is a circuit diagram of an existing AC to DC converter. Please refer to figure 1 , the AC-to-DC converter 1 includes an Electro Magnetic Interference (EMI for short) filter 11 , a rectification filter 12 and a Power Factor Corrector (PFC for short) 13 . The AC-to-DC converter 1 receives the mains AC power from the public grid....

Claims

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Application Information

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IPC IPC(8): H02M7/04H02M1/44H02M1/42
CPCY02B70/126H02M1/126H02M1/322Y02B70/10
Inventor 黄金川
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