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Active inrush current control using a relay for AC to DC converters

A technology of converters and relays, which is applied in the direction of converting AC power input to DC power output, emergency protection circuit devices for limiting overcurrent/overvoltage, and output power conversion devices to improve efficiency and reduce power loss , low-cost effect

Inactive Publication Date: 2008-09-17
ASTEC INT LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0039] The present invention solves the problems of the prior art devices by providing a circuit and corresponding method which provide control to limit inrush current in AC to DC converters under cold crank, warm crank and power line disturbance conditions

Method used

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  • Active inrush current control using a relay for AC to DC converters
  • Active inrush current control using a relay for AC to DC converters
  • Active inrush current control using a relay for AC to DC converters

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Embodiment Construction

[0058] The present invention includes circuits and corresponding methods that provide control to limit inrush current in AC-DC power converters during cold start, hot start, and power line disturbance conditions. The present invention overcomes the disadvantages of known circuits and methods. The present invention will be further described in detail below.

[0059] FIG. 7A shows a circuit diagram of a preferred embodiment of an AC-DC power converter 200 according to the present invention. Converter 200 is operatively connected between an AC input voltage (shown between terminals ACL and ACN) from an AC voltage source (not shown) and a DC bulk output appearing between terminals "Bulk+" and "Bulk-" voltage between. The DC bulk output voltage is typically applied to the input of a DC-DC converter (not shown), providing further regulation and / or voltage conversion. The AC input voltage is coupled to bridge rectifier 294 . Bridge rectifier 294 includes diodes 237 , 238 , 242 an...

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PUM

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Abstract

A circuit and corresponding method for controlling inrush current in an AC-DC power converter by providing a relay and a control circuit for limiting inrush current efficiently during cold startup, warm startup, and power line disturbance conditions. The relay is preferably connected in series with a bulk capacitor of the converter and in parallel with a limiting resistor and switch for shunting the resistor and switch so as to improve efficiency during operating conditions, at reduced size and cost. A preferred embodiment includes use of the circuit for AC-DC converters having active power factor correction.

Description

technical field [0001] This invention relates to controlling inrush current in power supplies, and more particularly to circuits for controlling inrush current during cold crank, warm crank, and power line disturbance conditions. Background technique [0002] Inrush current control is especially important in N+1 redundant power systems. If the excessive inrush blows a fuse or trips the main circuit breaker on the AC distribution panel, system redundancy is lost even though the power supply is still functioning. The inrush current requirements of modern power supplies are very stringent, requiring efficient control of inrush current even during abnormal power line disturbances and high current application situations. [0003] To control inrush current, traditional approaches have employed relays, negative temperature coefficient (NTC) thermistors, thyristors, or similar switches, often in combination with resistors or thermistors, to attempt to limit inrush current in AC-DC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/00H02M1/00
CPCH02M7/125H02H9/001
Inventor V·G·帕德克
Owner ASTEC INT LTD
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