Switch mode power supply and method for operating the switch mode power supply
First Claim
Patent Images
1. A switch mode power supply, comprising:
- a switch element; and
a control for operative coupling to a DC link of a converter having a main contactor electrically connected to an auxiliary contactor which is electrically connected in series with a resistor, the control controlling the switch element and the switch mode power supply being electrically connected in parallel to a capacitor of the DC link;
wherein the switch mode power supply has a start-up delay such that control of the switch element is blocked during the start-up delay, after a DC link voltage, applied to an input-side of the switch mode power supply, at the DC link reaches a specified threshold value, and is blocked during the start-up delay until a predetermined start delay period (T), which is longer than a time interval for charging the DC link, has elapsed.
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Abstract
A switch mode power supply and method for operating the power supply and to the use of the same, wherein the switch mode power supply comprises a control for controlling a control element and is connected to a DC link of the converter, the switch mode power supply comprises a startup-delay such that control of the switch element is blocked until a predetermined start delay duration (T) has lapsed, where the start delay duration (T) is longer than the time span between DC link charging.
13 Citations
14 Claims
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1. A switch mode power supply, comprising:
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a switch element; and a control for operative coupling to a DC link of a converter having a main contactor electrically connected to an auxiliary contactor which is electrically connected in series with a resistor, the control controlling the switch element and the switch mode power supply being electrically connected in parallel to a capacitor of the DC link; wherein the switch mode power supply has a start-up delay such that control of the switch element is blocked during the start-up delay, after a DC link voltage, applied to an input-side of the switch mode power supply, at the DC link reaches a specified threshold value, and is blocked during the start-up delay until a predetermined start delay period (T), which is longer than a time interval for charging the DC link, has elapsed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for operating a switch mode power supply, comprising:
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detecting a threshold value (Us) of a DC link voltage (U, U′
) applied to an input-side of the switch mode power supply at a DC link of a converter having a main contactor electrically connected to an auxiliary contactor which is electrically connected in series with a resistor such that a predetermined start delay period (T) commences after the threshold value (Us) is reached, the switch mode power supply being electrically connected in parallel to a capacitor of the DC link; andblocking control of a switch element of the switch mode power supply after a voltage at the DC link reaches a specified threshold value after a start-up delay (t0) and until the predetermined start delay period (T), which is longer than a time interval for charging the DC link, has elapsed. - View Dependent Claims (13, 14)
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Specification