Three-phase rectifier electrifying device
A three-phase rectification and electrical device technology, applied in circuits, irreversible AC power input is converted into DC power output, thyristor and other directions, which can solve the problem of limiting switch capacity, excessive voltage ripple of electrolytic capacitors, resistance of electrolytic capacitors and variable frequency switches. pressure hazards and other problems, to achieve the effect of easy implementation, simple structure and low additional cost
Inactive Publication Date: 2012-09-05
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
[0002] The power electronic conversion device powered by three-phase AC power supply can be used in power transmission, power system and other application fields. The front-stage circuit of this conversion device is generally a combination circuit of an uncontrolled three-phase rectifier bridge and an electrolytic capacitor. When the electrolytic capacitor has zero voltage, the three-phase AC voltage is powered on, and an inrush current will be generated. The result is: causing the air switch to operate and limiting the switch capacity; the grid side current impact is too large, causing an instantaneous voltage drop and causing Harmonic current pollution; too high no-load voltage of electrolytic capacitors will cause damage to the withstand voltage of electrolytic capacitors and frequency conversion switches, so soft power-on technology must be adopted
[0004] However, this existing technology cannot solve the problem of secondary power-on. During the power-on process, the voltage fluctuation of the electrolytic capacitor is relatively large, and the amplitude of the line current is high, which causes the air switch to malfunction, and the voltage ripple of the electrolytic capacitor is too large, which affects its working life.
Due to the existence of the distributed inductance of the line, the high no-load voltage will cause damage to the withstand voltage of the electrolytic capacitor and the frequency conversion switch
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[0012] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0013] like figure 1 As shown, this embodiment includes: a rectification circuit 1, a power supply circuit 2 and a control circuit 3, wherein: the input terminals of the rectification circuit 1 and the power supply circuit 2 are respectively connected with three fire wires R, S and T of the three-phase AC power supply, and rectification The output end of the circuit 1 is connected with the control circuit 2 to output control power, and the control end of the rectification circuit 1 is connected with the output end of the control circuit 3 to receive the control signal.
[0014] The rectifier circuit 1 includes: a ...
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The invention discloses a three-phase rectifier electrifying device in the technical field of electric power, comprising a rectification circuit, a power supply circuit and a control circuit, wherein the input ends of the rectification circuit and the power supply circuit are respectively connected with three live wires of a three-phase alternating current power supply; the output end of the rectification circuit is connected with the control circuit to output a control power supply; and the control end of the rectification circuit is connected with the output end of the control circuit so asto receive a control signal. The invention has the advantages of simple structure, low additional cost, easy realization, and the like.
Description
technical field [0001] The invention relates to a power-on device in the technical field of power electronics, in particular to a three-phase rectification power-on device for a three-phase uncontrolled rectifier or a voltage source PWM rectifier. Background technique [0002] The power electronic conversion device powered by three-phase AC power supply can be used in power transmission, power system and other application fields. The front-stage circuit of this conversion device is generally a combination circuit of an uncontrolled three-phase rectifier bridge and an electrolytic capacitor. When the electrolytic capacitor has zero voltage, the three-phase AC voltage is powered on, and an inrush current will be generated. The result is: causing the air switch to operate and limiting the switch capacity; the grid side current impact is too large, causing an instantaneous voltage drop and causing Harmonic current pollution; too high no-load voltage of electrolytic capacitors wi...
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IPC IPC(8): H02M7/02H02M7/12H02M7/145
Inventor 杨喜军杨兴华田书欣
Owner SHANGHAI JIAOTONG UNIV