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Power supply device with extremely low harmonic interference

A power supply device and harmonic interference technology, applied in the power supply field, can solve the problems of large harmonic interference, unsuitability, difficulty in filtering harmonic interference, etc., and achieve harmonic interference suppression, reduction of electromagnetic radiation, and low output harmonics. Effect

Inactive Publication Date: 2013-02-27
EAST CHINA INST OF OPTOELECTRONICS INTEGRATEDDEVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difficulty of filtering harmonic interference, the harmonic interference of current general-purpose DC / DC power supply modules is relatively large, and it is not suitable for use in systems with relatively high requirements for harmonic interference.

Method used

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  • Power supply device with extremely low harmonic interference
  • Power supply device with extremely low harmonic interference
  • Power supply device with extremely low harmonic interference

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing, the best implementation of the present invention is described in further detail:

[0039] 1. Circuit part:

[0040] Depend on figure 1 As shown, the ultra-low harmonic interference power supply device of the present invention is mainly composed of input EMI filter circuit, PWM control circuit, power switch tube AC ​​circuit, output rectifier AC circuit, isolation feedback circuit and output EMI filter circuit. The harmonics of the power supply are mainly related to the input and output EMI filter circuit, the AC circuit of the power switch tube and the AC circuit of the output rectifier. The present invention has adopted effective harmonic interference suppression measures in these four parts of the circuit. The following is combined with the accompanying drawings Describe in detail the specific measures taken.

[0041] Such as figure 2 As shown, in the input EMI filter circuit, two capacitors C20, C21 and a common mod...

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Abstract

The invention relates to a power supply device with extremely low harmonic interference. The device is characterized in that: a filtering layer (1) which consists of four layers of integrally copper-laid printed circuit boards (PCB) is arranged on a metal tube shell (8); the bottom of the filtering layer (1) is provided with input and output electro-magnetic interference (EMI) filtering circuits (1b); the middle of the metal tube shell is provided with a shield layer (7) which consists of four layers of integrally copper-laid PCBs; a main control layer (9) is arranged below the metal tube shell and is provided with a pulse-width modulation (PWM) control circuit, a power switch tube alternating current loop, an output rectifier alternating current loop and the like; feedthru capacitors (3) are connected to the filtering layer and the main control layer; ground wires of the feedthru capacitors (3) are connected to the metal tube shell; and input and output leads enter or leave the metal tube shell through the feedthru capacitors. The device has the advantages that: outward electromagnetic radiation of a power supply module is reduced greatly and high anti-jamming capability is realized; output harmonic waves are extremely low and are about one fifth that of the same type of general direct current to direct current (DC / DC) power supply module; a harmonic interference signal in a full bandwidth range is lower than 20 mV; and the power supply device can be well applied to anti-electromagnetic environment equipment with high requirement on harmonic waves.

Description

technical field [0001] The invention belongs to the technical field of power supply, in particular to a power supply device with wide input voltage range and extremely low output harmonic interference. Background technique [0002] In the anti-electromagnetic environment equipment, due to its small size and wide input voltage range, a large number of DC / DC power supply modules are used in the power supply system, and the DC / DC power supply will inevitably generate harmonic interference due to its working mode. In the stage circuit, it affects the normal operation of the subsequent stage circuit. For example, the signal collected by the fiber optic gyroscope sometimes has a relatively small amplitude and narrow pulse width. If the harmonic generated by the power module used is relatively large, it will cause the system to fail to extract useful signals or mistakenly regard the harmonic signal as a useful signal for acquisition and processing. [0003] The harmonics generated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M1/44
Inventor 卢灿孙帮东吴力涛邓闯
Owner EAST CHINA INST OF OPTOELECTRONICS INTEGRATEDDEVICE
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