Method, device and switch for providing short-circuit protection for resistive ac load

A device for providing short-circuit protection for a resistive AC load, comprising a controller for controlling the on/off state of an active controlled switch for controlling the connection or disconnection between the load and an AC power supply connected therewith, wherein an output port of the controller connected with a control end of the active controlled switch to control the on/off state of the active controlled switch;

• also comprising a first conduction angle control module, a current detection circuit, a mean value acquisition module and a determination module, wherein the first conduction angle control module used for controlling the active controlled switch to be turned on within the first conduction angle range;
• the current detection circuit used for obtaining the current flowing through the load, converting the current into a form acceptable by the controller, and sending the current in the acceptable form to an input port of the controller;
• the mean value acquisition module used for obtaining the mean current value outputted by the current detection circuit;
• and the determination module used for determining whether the mean current value greater than a default value or not.

A switch for controlling the connection or disconnection between a resistive AC load applying an AC power supply and an AC network, comprising a controller for controlling the on/off state of an active controlled switch for controlling the connection or disconnection between the resistive AC load and the power supply connected therewith, wherein an output port of the controller connected with a control end of the active controlled switch to control the on/off state of the active controlled switch;

• also comprising a first conduction angle control module, a current detection circuit, a mean value acquisition module and a determination module, wherein the first conduction angle control module used for controlling the active controlled switch to be turned on within the first conduction angle range;
• the current detection circuit used for obtaining the current flowing through the load, converting the current into a form acceptable by the controller, and sending the current in the acceptable form to an input port of the controller;
• the mean value acquisition module used for obtaining the mean current value outputted by the current detection circuit;
• and the determination module used for determining whether the mean current value greater than a default value or not.