DC constant current power supply with low ripple implemented through mixing IGBT series and parallel connections

A stable current power supply and low ripple technology, which is applied in the direction of converting DC power input to DC power output, electrical components, and adjusting electrical variables. Non-characteristic sub-harmonic spectrum is complex and other problems, to achieve the effect of low noise, small size and high stability

Active Publication Date: 2012-05-30
TIANSHUI ELECTRIC DRIVE RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complexity of the non-characteristic sub-harmonic spectrum of this scheme, it is difficult to design and calculate the frequency selection network of the control system, and the workload of on-site debugging is huge.

Method used

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  • DC constant current power supply with low ripple implemented through mixing IGBT series and parallel connections
  • DC constant current power supply with low ripple implemented through mixing IGBT series and parallel connections
  • DC constant current power supply with low ripple implemented through mixing IGBT series and parallel connections

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing, the present invention will be further described:

[0036] Use IGBT series-parallel hybrid to realize low ripple DC steady current power supply, including:

[0037] The incoming line filter circuit is used to attenuate the noise interference of the power grid and the power supply to each other, and the incoming line filter circuit is composed of incoming line filters U11~U14;

[0038] It is used to generate a phase-shifting circuit with a phase shift of 15° for the electrical signal processed by the incoming filter circuit; the secondary windings of the transformers T1~T4 are phase-shifted by 15°;

[0039] The input rectification and filter circuit for rectifying and filtering the phase-shifted electrical signal includes three-phase rectifiers A1 and A2 connected in series to form a 12-pulse rectifier, and A3 and A4 connected in series to form a 12-pulse rectifier. Observe these two rectifiers from the grid side 12-pulse r...

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Abstract

The invention relates to a direct current stabilized current power supply which realizes low ripple by IGBT series-parallel connection, and the invention belongs to the field of automatic control technology and power electronic technology and relates to a power change circuit based on a large capacity IGBT apparatus. The power change circuit comprises an incoming filter circuit, a phase shifting circuit, an input end rectification filter circuit, an energy storage circuit, a front reduction voltage chopper circuit, a front passive filter circuit, a back reduction voltage chopper circuit, a back passive filter circuit, an output end passive filter circuit, a voltage sensor circuit, a current sensor circuit and a control circuit used for controlling a whole circuit to work. Water cooling orforced air cooling can be applied to the direct current stabilized current power supply, and the direct current stabilized current power supply has the advantages that the power supply has high stability of current in a long term, low voltage (current) ripple, fast response, high regulation precision, small size, high efficiency and small noise of a device.

Description

technical field [0001] The invention belongs to the field of automatic control technology and power electronics technology, and relates to a power conversion circuit based on a large-capacity IGBT device. Specifically, it can be used for long-term current stability, voltage (current) ripple, rapid response, adjustment accuracy, etc. For occasions with high performance requirements, a series-parallel combination of IGBT (Insalated-Gate Bipolar Transistor, insulated gate bipolar transistor) is used to achieve a low-ripple DC steady-current power supply. Background technique [0002] In important fields such as basic scientific research, medical and health care, rail transit, and national defense industry, it is usually necessary to use a high-current steady-current power supply to supply excitation current to the magnet. These applications have strict requirements on the stability of the magnetic field. To ensure the long-term stability of the magnetic field, it is necessary t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02M1/14G05F1/56
Inventor 吴保宁王有云党怀东燕伟康丁军怀马红霞石立峰
Owner TIANSHUI ELECTRIC DRIVE RES INST
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