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

A steady-current power supply and low-ripple technology, which is applied in the direction of DC power input conversion to DC power output, electrical components, and adjustment of electrical variables, can solve the problem of complex non-characteristic sub-harmonic spectrum and frequency-selective network design and calculation of control systems Difficult, on-site debugging workload and other problems, to achieve the effect of small size, low noise, high stability

Active Publication Date: 2009-04-22
TIANSHUI ELECTRIC DRIVE RES INST
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  • Claims
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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] The present invention will be further described below in conjunction with the accompanying drawings:

[0036] Using IGBT series-parallel hybrid to achieve low-ripple DC power supply, including:

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

[0038] It is used to generate a phase shift circuit that shifts the phase of the electrical signal processed by the incoming filter circuit by 15°; the secondary windings of the transformers T1 to T4 are phase-shifted by 15° to each other;

[0039] The input rectifier and filter circuit used to rectify and filter the phase-shifted electrical signal includes three-phase rectifiers A1 and A2 in series to form 12-pulse rectification, and A3 and A4 in series to form 12-pulse rectification. Observe these two from the grid side. 12-pulse rectification is composed of...

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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 or forced 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 fields of automatic control technology and power electronics technology, and relates to a power conversion circuit based on large-capacity IGBT devices, which can be specifically used for long-term current stability, voltage (current) ripple, rapid response, adjustment accuracy, etc. For occasions with high performance requirements, an IGBT (Insalated-GateBipolar Transistor, Insulated Gate Bipolar Transistor) is used in series-parallel mixing to achieve a low-ripple DC regulated 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 supply excitation current to the magnet with a high-current constant-current power supply. 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 to ensure...

Claims

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Application Information

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Patent Type & Authority Applications(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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