Voltage converter and surge current limiting device thereof

Abstract

The invention discloses a surge current limiting device. Because a controllable switch is in a high-impedance state at the beginning of conduction, the surge current in the loop can be limited. Because the controllable switch can be uniformly turned on to a complete conduction state at a preset rate under the control of a processor, the impedance of the controllable switch can be reduced graduallyand be close to zero finally in the process, and a surge current cannot be generated again due to voltage jump caused by sudden change of the impedance. The surge current in a voltage converter is limited, and related devices are protected. The invention further discloses a voltage converter which has the same beneficial effects as the surge current limiting device.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a surge current limiting device, and also to a voltage converter. Background technique [0002] When the voltage converter starts up, it needs to charge its own internal filter capacitor first, which will generate a large surge current, which will seriously pollute the power supply network and even cause damage to other components in the circuit. In technology, a resistor is usually connected in series on the power supply line of the filter capacitor, and a switch is connected in parallel at both ends of the resistor. Inrush current, when the capacitor is fully charged, the switch needs to be closed to improve power supply efficiency, but the voltage divided by the resistor will be applied to the capacitor instantaneously to generate a higher inrush current, which may still damage related devices. Current limiting is less effective. [0003] Therefore, how to provide a ...

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Problems solved by technology

[0002] When the voltage converter starts up, it needs to charge its own internal filter capacitor first, which will generate a large surge current, which will seriously pollute the power supply network and even cause damage to other components in the circuit. In technology, a resistor is usually connected in series on the power supply line of the filter capacitor, and a switch is connected in parallel at both ends of the resistor. Inrush current, when the capacitor is fully charged, the switch needs to be closed to improve power supply efficiency, but the voltage divided by the resistor will be applied to the capacitor instantaneously to generate a higher inrush current, which may still damage related devices. Less effective current limiting

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