Input current low frequency fluctuation controller of low frequency dynamic power supply

A technology of dynamic power supply and input current, applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc. Problems such as large inductance of L

Active Publication Date: 2009-01-14
XIAN ACTIONPOWER ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the fluctuation frequency of the output power of the low-frequency dynamic power supply is very low, the inductance of the filter inductor L is required to be large, so the volume and weight of the entire power supply device are greatly increased
So it's not a good solution

Method used

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  • Input current low frequency fluctuation controller of low frequency dynamic power supply
  • Input current low frequency fluctuation controller of low frequency dynamic power supply
  • Input current low frequency fluctuation controller of low frequency dynamic power supply

Examples

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Embodiment Construction

[0016] see figure 1 The inverter main circuit of this low-frequency dynamic power supply includes an input rectifier 2, a PWM inverter 3 and an LC filter 13, and a step-up chopper circuit 1 is added between the input rectifier 2 and the PWM inverter 3, and the step-up chopper The wave circuit 1 is composed of an input filter inductor L, a half-bridge circuit composed of a diode D and a switch tube Q connected in series, and an energy storage capacitor C connected to the DC output side of the half-bridge circuit. The output terminal of the input filter inductor L is connected to The series connection point of the half-bridge circuit diode D and the switch tube Q. When the switch tube Q is turned on, the current i in the input filter inductor L L increase; when the switch tube Q is turned off, its current i L It is reduced by the freewheeling of the diode D, and by controlling the high-frequency switching frequency of the switching tube Q, the current waveform i of the input ...

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Abstract

The invention relates to a low frequency fluctuation controller for an input current of a low frequency dynamic power supply mainly comprising a boost chopping circuit between an input rectifier connected to a low frequency dynamic power supply and an output pulse width modulation inverter and a voltage, current double control loop for constantly controlling the input current of the boost chopping circuit. The low frequency fluctuation of the input current in the boost chopping circuit is real-timely controlled by the power double control loop, thereby fully eliminating the great fluctuation of the input current at the side of the low frequency dynamic power supply, avoiding the current shock to the power network from the low frequency dynamic power supply and reducing the requirement to the power network capacity from the low frequency dynamic power supply. The characteristic of the invention is that the current shock to the power network from the low frequency dynamic power supply is better solved under the conditions without increasing the power supply size and weight, furthermore the control effect that the fluctuation of the input current is less than 5% is achieved.

Description

technical field [0001] The invention relates to a low-frequency dynamic power supply, in particular, it is a low-frequency fluctuation controller of the input current of the low-frequency dynamic power supply. Background technique [0002] Low-frequency dynamic power supply refers to the power supply with low-frequency dynamic changes in the power of the output load, such as: 2Hz booster dynamic magnet power supply used in ion accelerators and 4Hz~20Hz electromagnetic stirring power supply used in metal induction heating devices, etc. They all belong to Low frequency dynamic power supply. The low-frequency dynamic power supply generally adopts the AC-DC-AC conversion method, and its typical circuit structure is as follows: image 3 As shown, it includes a rectifier, a filter inductor L, an energy storage capacitor C, a pulse width modulation inverter (PWM inverter for short) and an LC filter. When the low-frequency dynamic power supply is working, the low-frequency dynamic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/44H02M1/14H02M3/155H02M3/156
Inventor 卢家林罗来明石涛李德明李瑞沈天健
Owner XIAN ACTIONPOWER ELECTRIC
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