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Current compensating device

a compensation device and current technology, applied in the field of current compensation devices, can solve the problems of increasing power loss and reducing the power factor of the power supply, and achieve the effect of enhancing the power factor

Inactive Publication Date: 2013-06-27
CHICONY POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a current compensating device that improves the power factor of a power supply. The device detects an AC voltage and delivers it to a switching unit through a rectifier and filtering unit. The switching unit is conductive when the AC voltage is at a certain level and provides a current to an IC and modulating PWM frequency to enhance power factor.

Problems solved by technology

Such that the power factor of the power supply is reduced when operating in high-voltage and then increase power loss.

Method used

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Embodiment Construction

[0013]A preferred embodiment of the present invention will be described with reference to the drawings.

[0014]Reference is made to FIG. 1, which is a circuit block diagram of a current compensating device of the present invention. The current compensating device 10 is disposed within a power supply (not shown) and electrically connected to an integrated circuit (IC) 20. The power supply provides a power for driving the IC 20, the current compensating device 10 provides a compensating current to the IC 20 when the IC 20 is operated in high-voltage and simultaneously modulating PWM frequency of the power supply so as to enhance power factor. The current compensating device 10 includes a detecting unit 110, a rectifier 120, a filtering unit 130 and a switching unit 140. With reference also to FIG. 2, the detecting unit 110 is electrically connected to an alternating current (AC) voltage Vac. In this embodiment, the AC voltage Vac follows the characteristic sinusoidal shape, the waveform...

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Abstract

A compensating device is used for providing current compensation of an IC when operating in the high-voltage. The current compensating device includes a detecting unit, a rectifier, a filtering unit and a switching unit. The detecting unit electrically connected to an AC voltage. The rectifier is electrically connected to the detecting unit. The filtering unit is electrically connected to the rectifier. The switching unit is electrically connected to the filtering unit. The switching unit is conducted and provides a current to the IC when the AC voltage is above a predetermined voltage.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a current compensating device, especially to a current compensating device for an IC operating in high-voltage, the current compensating device provides a compensating current to the IC when the IC is operated in high-voltage and modulates PWM frequency at the same time.[0003]2. Description of Prior Art[0004]Power supply is an essential unit of electrical device and usually has a power converter. Among them, switch power supply uses pulse width modulation technology to modulate input power fed to load. PWM controller (or called pulse width modulator) turns on / off switches between power supply and load and changes a DC input voltage into a series of pulse voltage, then the pulse voltage is converted by transformer and diode to form smoothly DC voltage. The output voltage is compared with a reference voltage and voltage difference feedback to the PWM controller. If the output voltage is ab...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G05F3/04
CPCY02B70/12Y02B70/126H02M2001/4275H02M1/44H02M1/42H02M1/4275Y02B70/10
Inventor TSAI, CHAO-WEILIN, CHIA-CHIEH
Owner CHICONY POWER TECH CO LTD