CIRCUIT PROTECTION APPARATUS

摘要

A circuit protection apparatus is disclosed. A peripheral interface includes a first power node and a second power node. The circuit protection apparatus includes an auxiliary power supply circuit, a power converter, a first switch, a second switch, a power switch circuit, a warning circuit, and a controller. When a load is plugged to the peripheral interface, the first switch turns on, and the controller is enabled and outputs a control signal, so as to drive the power converter to output power. When the current between input terminal and output terminal of the power switch circuit is larger than a predetermined current, the controller receives the error flag logical voltage outputted by the power switch circuit, cuts off the current between input terminal and output terminal of the power switch circuit, and stops the operations of the power converter.

主权项

1. A circuit protection apparatus, for controlling a peripheral interface, wherein the peripheral interface includes a first power node and a second power node, and the circuit protection apparatus comprises:
an auxiliary power supply circuit, including a first terminal and a second terminal, wherein the first terminal of the auxiliary power supply circuit is coupled to a power voltage, and the second terminal of the auxiliary power supply circuit is coupled to the first power node; a power converter, including an input terminal and an output terminal, wherein the output terminal of the power converter is coupled to the second terminal of the auxiliary power supply circuit, and the input terminal of the power converter receives a control signal for adjusting a voltage of the output terminal of the power converter according to the control signal; a first switch, including a first terminal, a second terminal, and a control terminal, wherein the second terminal of the first switch is coupled to a common voltage, and the control terminal of the first switch is coupled to the second power node; a second switch, including a first terminal, a second terminal, and a control terminal, wherein the second terminal of the second switch is coupled to the common voltage, and the first terminal of the second switch is coupled to the second power node; and a controller, including a first control terminal, a second control terminal, an enable terminal, and a detection terminal, wherein the first control terminal of the controller is coupled to the input terminal of the power converter, the second control terminal of the controller is coupled to the control terminal of the second switch, the enable terminal of the controller is coupled to the first terminal of the first switch, and the detection terminal of the controller is coupled to the second power node; wherein when a load is plugged to the peripheral interface and makes the first power node and the second power node be electrically connected with each other through the load, the second terminal of the auxiliary power supply circuit provides the power voltage to the control terminal of the first switch through the load, so that the first switch turns on and the enable terminal of the controller receives the common voltage; wherein after the enable terminal of the controller receives the common voltage, the controller is enabled, the first control terminal of the controller outputs the control signal for driving the output terminal of the power converter to output a power, the controller controls the second switch to turn on by using the second control terminal of the controller, and the controller continuously detects a voltage of the second power node by using the detection terminal; wherein when the controller detects that the voltage of the second power node is lower than a predetermined voltage, the first control terminal of the controller stops outputting the control signal, and the controller enters into a power saving mode.