Resistorless precharging

The invention relates to resistorless precharging. A boost PFC converter (11) includes a rectifier (12), a converter (13) and an output stage comprising an output capacitor (6) where the DC output voltage (7) is provided across the output capacitor (6). The rectifier includes four rectifying element...

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Hauptverfasser:	MICHAEL HUFNAGEL, FRANK SCHAFMEISTER
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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creator	MICHAEL HUFNAGEL FRANK SCHAFMEISTER
description	The invention relates to resistorless precharging. A boost PFC converter (11) includes a rectifier (12), a converter (13) and an output stage comprising an output capacitor (6) where the DC output voltage (7) is provided across the output capacitor (6). The rectifier includes four rectifying elements connected in a full bridge configuration where the upper two of these four rectifying elements are thyristors (9.1, 9.2) and where the lower two are diodes (9.3, 9.4). In that the thyristors (9.1, 9.2) are controlled such as to be open for only a part of each half period of the input voltage, the amount of current per half period that is passed to the output capacitor (6) is controllable and can be made very small. Accordingly, the charge current for precharging the output capacitor (6) can be controllably limited such that a bulky precharge resistor is not required anymore to avoid high inrush currents.
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A boost PFC converter (11) includes a rectifier (12), a converter (13) and an output stage comprising an output capacitor (6) where the DC output voltage (7) is provided across the output capacitor (6). The rectifier includes four rectifying elements connected in a full bridge configuration where the upper two of these four rectifying elements are thyristors (9.1, 9.2) and where the lower two are diodes (9.3, 9.4). In that the thyristors (9.1, 9.2) are controlled such as to be open for only a part of each half period of the input voltage, the amount of current per half period that is passed to the output capacitor (6) is controllable and can be made very small. 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A boost PFC converter (11) includes a rectifier (12), a converter (13) and an output stage comprising an output capacitor (6) where the DC output voltage (7) is provided across the output capacitor (6). The rectifier includes four rectifying elements connected in a full bridge configuration where the upper two of these four rectifying elements are thyristors (9.1, 9.2) and where the lower two are diodes (9.3, 9.4). In that the thyristors (9.1, 9.2) are controlled such as to be open for only a part of each half period of the input voltage, the amount of current per half period that is passed to the output capacitor (6) is controllable and can be made very small. 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A boost PFC converter (11) includes a rectifier (12), a converter (13) and an output stage comprising an output capacitor (6) where the DC output voltage (7) is provided across the output capacitor (6). The rectifier includes four rectifying elements connected in a full bridge configuration where the upper two of these four rectifying elements are thyristors (9.1, 9.2) and where the lower two are diodes (9.3, 9.4). In that the thyristors (9.1, 9.2) are controlled such as to be open for only a part of each half period of the input voltage, the amount of current per half period that is passed to the output capacitor (6) is controllable and can be made very small. Accordingly, the charge current for precharging the output capacitor (6) can be controllably limited such that a bulky precharge resistor is not required anymore to avoid high inrush currents.</abstract><oa>free_for_read</oa></addata></record>
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subjects	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
title	Resistorless precharging
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