OVER-VOLTAGE PROTECTION APPARATUS AND METHOD OF OPERATING THE SAME

摘要

An over-voltage protection apparatus includes an input voltage detection module (12) and a second switch (14). The input voltage detection module (12) includes a switch assembly (121), a rectifying circuit (122), a voltage detection circuit (123), and a voltage protection circuit (124). The rectifying circuit (122) rectifies an AC power source (Vac) to generate a DC voltage (Vb). The voltage protection circuit (124) controls the second switch (14) to disconnect the AC power source (Vac) to supply a load (90) when the voltage detection circuit (123) detects that the DC voltage (Vb) reaches to a first over voltage value (Voth1). The voltage protection circuit (124) controls the switch assembly (121), thereby providing a voltage-limiting protection and a current-limiting protection when the voltage detection circuit (123) detects that the DC voltage (Vb) reaches to a second over voltage value (Voth2).

主权项

1. An over-voltage protection apparatus connected to an AC power source and a load, the apparatus comprising:
an input voltage detection module, comprising: a switch assembly connected to one terminal of the AC power source; a rectifying circuit connected to the other terminal of the AC power source and the switch assembly, and configured to receive the AC power source and rectify the AC power source to generate a DC voltage; a voltage detection circuit configured to receive the DC voltage and output a voltage signal; and a voltage protection circuit configured to receive the voltage signal and output a first switch signal and a second switch signal; and a second switch connected to the AC power source, the load, and the input voltage detection module; wherein the second switch signal is configured to control the second switch to disconnect the AC power source supplying power to the load when the voltage detection circuit is configured to detect that the DC voltage reaches to a first over voltage value; the first switch signal is configured to control the switch assembly to provide a voltage-limiting protection and a current-limiting protection when the voltage detection circuit is configured to detect that the DC voltage increases to reach to a second over voltage value.