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Apparatus and method for preventing surge

A surge and output voltage technology, applied in the field of surge prevention devices

Active Publication Date: 2011-02-09
REALTEK SEMICON CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, how to solve the problem derived from the discontinuity of the voltage waveform caused by the soft start device when the switch is switched in the traditional technology, or even the switching regulator is operating In the current state, the problems derived from the current surge are all issues that need to be solved urgently

Method used

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  • Apparatus and method for preventing surge
  • Apparatus and method for preventing surge
  • Apparatus and method for preventing surge

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Embodiment Construction

[0021] Please refer to figure 2 , which is a schematic diagram of the first embodiment of the device for preventing surges. The device for preventing surge includes an amplifier 10 and a voltage slope generator 20 .

[0022] The amplifier 10 has a non-inverting input terminal 12 , an inverting input terminal 14 , an output terminal 16 and a power control terminal 18 . The non-inverting input terminal 12 is coupled to the reference voltage, the output terminal 14 outputs an output voltage, and a feedback voltage is generated according to the output voltage, and the feedback voltage is coupled to the inverting input terminal 14 . Wherein, the reference voltage may be a bandgap voltage.

[0023] The voltage slope generator 20 is coupled to the power supply control terminal 18 of the amplifier 10 to generate a ramp voltage. The ramp voltage referred to herein is a ramp voltage, and the voltage value of the ramp voltage can rise from zero voltage to the power supply voltage. (V...

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Abstract

The invention relates to a device which can prevent surging and a method thereof. The device comprises an amplifier and a voltage slope coefficient generator; wherein, the amplifier is provided with a positive phase input end, an opposite phase input end, an output end and a power control end, wherein, the positive phase input end is coupled with reference voltage, output voltage is output by theoutput end, and feedback voltage is generated according to the output voltage and is coupled with the opposite phase input end. The voltage slope coefficient generator is coupled with the power control end of the amplifier, and the tardy rise voltage is generated; when the voltage value of the tardy rise voltage is lower than threshold value, the output voltage raises along with the tardy rise voltage; when the voltage value of the tardy rise voltage is not lower than threshold value, the output voltage takes on stable voltage value. In this way, the aim of smooth soft start or even inrush current prevention when in operation can be achieved.

Description

technical field [0001] The present invention relates to a device and method for preventing surge, in particular to a device and method for smooth soft start and preventing surge current during operation. Background technique [0002] Switching regulators have better voltage conversion efficiency, so they are usually used to convert large dropout voltages and large load currents. However, in the early stage of power-on, the switching regulator may easily cause excessive rush current or overshoot output voltage, which may cause damage to the circuit. Therefore, when starting up the power supply, a soft-start device (soft-start) is required to allow the power supply voltage to rise slowly. In addition to being applied to switching regulators, the soft start device can also be applied to a variety of circuits, as long as the input power must rise slowly to avoid excessive inrush current or excessive output voltage at the beginning of the start-up circuit, it can be used Use a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36G05F1/40G05F1/44
Inventor 江明澄王伟州
Owner REALTEK SEMICON CORP
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