Three-phase pulse width modulation rectifier circuit and its precharging method
A pulse width modulation and rectification circuit technology, which is applied to electrical components, conversion devices for converting AC power input to DC power output, and output power, etc. The problems of current and the number of electronic components are large, to avoid the input peak current, the number of electronic components is small, and the control method is simple.
Active Publication Date: 2021-05-14
SANTAK ELECTRONICS SHENZHEN
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Problems solved by technology
[0004] However, the three-phase pulse width modulation rectifier circuit 1 has one or more of the following defects: the circuit structure of the pre-charging circuit 12 is complex, the number of electronic components is large, and the cost is high
Especially when the voltage of a certain phase of alternating current is too large, a very large input peak current or surge current will be generated in the switch and inductance connected in series with the alternating current of this phase, thus causing damage to the switch
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[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0032] figure 2 It is a circuit diagram of a three-phase pulse width modulation rectifier circuit according to a preferred embodiment of the present invention. Such as figure 2 As shown, the three-phase pulse width modulation rectifier circuit 2 includes: a three-phase pulse width modulation rectifier 21, which includes three AC input terminals, a positive output terminal 211 and a negative output terminal 212; a first switch S21, a second switch S22 and a second Three switches S33, one end of which is respectively connected to the three AC input terminals of the three-phase pulse width modulation rectifier 21, and the other end is respectively connected to the first-phase alternating current V1, the second-phase alternating current...
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The present invention provides a three-phase pulse width modulation rectifier circuit and a precharging method thereof. The three-phase pulse width modulation rectifier circuit includes: a three-phase pulse width modulation rectifier, which includes an input terminal, a positive output terminal and a negative output terminal; The first, second and third switches connected between the input terminal of the three-phase pulse width modulation rectifier and the three-phase alternating current; the first capacitor and the second capacitor connected in series between the positive output terminal and the negative output terminal Two capacitors, the node formed by connecting the first capacitor and the second capacitor is connected to the neutral point; the first unidirectional charging is connected between the first phase of the three-phase alternating current and the positive output terminal a branch, which is used to precharge the first capacitor; and a second unidirectional charging branch connected between the first phase alternating current and the negative output terminal, which is used to charge the second The capacitor is precharged. The precharging method of the present invention avoids the input peak current.
Description
technical field [0001] The invention relates to a pulse width modulation rectifier circuit, in particular to a three-phase pulse width modulation rectifier circuit and a precharging method thereof. Background technique [0002] The three-phase pulse width modulation rectifier circuit has the advantages of low grid-side current harmonics, high power factor, bidirectional energy flow, etc., and has been widely used and researched. [0003] figure 1 It is a three-phase pulse width modulation rectification circuit in the prior art. Such as figure 1 As shown, the three-phase pulse width modulation rectifier circuit 1 includes a three-phase pulse width modulation rectifier 11; a first switch S11, a second switch S12 and a third switch S13 connected to the input end of the three-phase pulse width modulation rectifier 11; The capacitor C11 of the output terminal of the three-phase pulse width modulation rectifier 11; The capacitor C11 is charged before the switch S11 , the secon...
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IPC IPC(8): H02M7/797H02M1/36
CPCH02M1/36H02M7/797
Inventor 郭晓露张登科张冬宇
Owner SANTAK ELECTRONICS SHENZHEN