Three-phase four-wire double voltage rectification power supply circuit

Abstract

The invention discloses a three-phase four-wire double voltage rectification power supply circuit. The three-phase four-wire double voltage rectification power supply circuit comprises rectifier diodes D1, D2, D3, D4, D5 and D6, and filter capacitors C1 and C2; a positive electrode of the D1, a negative electrode of the D2 and an A phase power supply input are connected; a positive electrode of the D3, a negative electrode of the D4 and a B phase power supply input are connected; a positive electrode of the D5, a negative electrode of the D6 and a C phase power supply input are connected; a negative electrode of the C1, a positive electrode of the C2 and an N phase power supply input are connected; a negative electrode of the D1, a negative electrode of the D3, a negative electrode of the D5 and a positive electrode of the C1 are connected; a positive electrode of the D2, a positive electrode of the D4, a positive electrode of the D6 and a negative electrode of the C2 are connected; a positive electrode of the C1 and a negative electrode of the C2 are outputs of the three-phase four-wire double voltage rectification power supply circuit. When a single-phase power supply or a two-phase power supply or a three-phase power supply is connected, a voltage peak of a three-phase four-wire bridge rectifier circuit output is twice that of phase voltage, thereby reducing the designing and manufacturing difficulty of a three-phase four-wire switch power supply.

Description

technical field [0001] The invention relates to the technical field of power circuits, in particular to a three-phase four-wire voltage doubler rectifier power circuit. Background technique [0002] The three-phase four-wire switching power supply circuit used in electronic instruments and meters, such as figure 1 As shown, it is usually composed of a three-phase four-wire bridge rectifier circuit, a filter circuit and a DC conversion circuit. The three-phase four-wire bridge rectifier circuit performs bridge rectification on the three-phase four-wire input power supply. The peak voltage output by the three-phase four-wire bridge rectifier circuit is 1.73 times the peak value of the input phase voltage. It is converted into a relatively flat DC power supply by the filter circuit, and then converted into the required DC current by the DC conversion circuit to supply power to electronic instruments and meters. . When the two-phase power supply is disconnected, under the cond...

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Problems solved by technology

When the two-phase power supply is disconnected, under the condition of only one-phase power supply, the three-phase four-wire switching power supply circuit of the electronic instrument is required to have sufficient power supply capacity to ensure the normal operation of the electronic instrument, while the single-phase input In the case of , the peak voltage output by the three-phase four-wire bridge rectifier circuit is the peak value of the input phase voltage. Therefore, under the same input voltage value, when the three-phase power supply is connected, the three-phase four-wire The peak voltage output of the line bridge rectifier circuit differs by 1.73 times, which requires the three-phase four-wire switching power supply circuit to have a sufficiently wide operating voltage range, which increases the difficulty of design and production of the three-phase four-wire switching power supply

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