US 2019/0196528 A1Published application

Current-limiting circuit and controlling method thereof

AssigneePegatron Corporation

InventorsChun-Hung WU, Chau-Tung FAN CHIANG

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Abstract

A current-limiting circuit and a controlling method thereof are disclosed. The current-limiting circuit includes a current input terminal, a current output terminal, a switch module, a differential amplifier, a first resistor and a first capacitor. A signal input end of the switch module is connected to the current input terminal, and a signal output end is connected to the current output terminal. A positive input end of the differential amplifier is connected to the signal output end of the switch module, a negative input end is connected to the current output terminal, and an amplified output end is connected to a control end of the switch module. The first resistor is connected to the signal output end, the positive input end, the negative input end, and the current output terminal. The first capacitor is connected to the first resistor, the current output terminal, and a ground.

Claims15

Dependent claims

A current-limiting circuit, comprising:

a current input terminal;
a current output terminal;
a switch module, comprising a signal input end, a signal output end and a control end, wherein the signal input end is electrically connected to the current input terminal, and the signal output end is electrically connected to the current output terminal;
a differential amplifier, comprising a positive input end, a negative input end and an amplified output end, wherein the positive input end is electrically connected to the signal output end of the switch module, the negative input end is electrically connected to the current output terminal, and the amplified output end is electrically connected to the control end of the switch module;
a first resistor, wherein one end of the first resistor is electrically connected to the signal output end of the switch module and the positive input end, and the opposite end of the first resistor is electrically connected to the negative input end and the current output terminal;
and
a first capacitor, wherein one end of the first capacitor is electrically connected between the first resistor and the current output terminal, and the opposite end of the first capacitor is connected to a ground.

4 more elements

A method of controlling a current limiting circuit, used for a current-limiting circuit, the current-limiting circuit comprising a current input terminal, a current output terminal, a switch module, an differential amplifier, a first resistor and a first capacitor, wherein the switch module has a cut-off voltage, the method comprising the following steps:

inputting, by the current input terminal, an initial current signal to flow through two ends of the first resistor to generate a voltage difference;
outputting, by the differential amplifier, a control signal according to the voltage difference;
determining whether a voltage of the control signal is less than the cut-off voltage;
when the voltage of the control signal is less than the cut-off voltage, the switch module is kept turned on to enable the current output terminal to output the initial current signal;
charging the first capacitor by the initial current signal;
when the voltage of the control signal is greater than the cut-off voltage, the switch module is turned off so that the current output terminal does not output the initial current signal;
and
discharging from the first capacitor to output a discharge current signal through the current output terminal.

5 more elements

Dependencies are inferred from the claim text.