System and method for leakage current protection

Patent metadata

Field	Value
Publication number	US-2018316177-A1
Application number	US-201815883048-A
Country	US
Kind code	A1
Filing date	Jan 29, 2018
Priority date	Apr 28, 2017
Publication date	Nov 1, 2018
Grant date	—

Abstract

The present invention discloses a system and method for leakage current protection. The leakage current protection method comprises the following steps: using a first control signal to control a first relay to be short circuit so as to generate a leakage current; a leakage current sensor generates an AC signal when the leakage current sensor detects the leakage current; using a leakage current signal processor to convert the AC signal to a DC signal; and when a latch circuit receives the DC signal, the latch circuit uses a second control signal to disconnect a second relay which is connected to electrical appliances which are needed to protect.

First claim

What is claimed is:

1 . A leakage current protection system, comprising:
a micro-control unit; a first relay, connected to the micro-control unit, wherein the micro-control unit uses a first control signal to control the first relay to be short circuit so as to generate a leakage current; a leakage current sensor, wherein the leakage sensor generates an AC signal if the leakage current is detected; a leakage current signal processor, connected to the leakage current sensor, wherein the leakage current signal processor converts the AC signal to a DC signal; a second relay, connected to the micro-control unit; and a latch circuit, connected to the leakage current signal processor, the micro-control unit, and the second relay, wherein the latch circuit uses a second control signal to disconnect the second relay when the latch circuit receives the DC signal, and the second relay is connected to electrical appliances which are needed to protect.

2 . The leakage current protection system of claim 1 , wherein the micro-control unit uses the first control signal to disconnect the first relay if the micro-control unit determines that the leakage current is a test leakage current generated by a self-detection procedure, the micro-control unit sends a third control signal to unlock the latch circuit, and the micro-control unit uses the second control signal to make the second relay be conducted.

3 . The leakage current protection system of claim 2 , further comprising:
an alarm unit, connected to the micro-control unit, when the latch circuit uses the second control signal to disconnect the second relay, the micro-control unit controls the alarm unit to issue an alarm sound if the micro-control unit determines the self-detection procedure is not being executed.

4 . The leakage current protection system of claim 2 , further comprising:
an communication unit, connected to the micro-control unit, when the latch circuit uses the second control signal to disconnect the second relay, the micro-control unit controls the communication unit to send an alarm message if the micro-control unit determines the self-detection procedure is not being executed.

5 . The leakage current protection system of claim 4 , wherein the micro-control unit receives a remote start signal of a remote server through the communication unit, if the micro-control unit determines that the remote start signal is received, and the micro control unit sends the third control signal to unlock the latch circuit.

6 . A leakage current protection method, comprising:
using a first control signal to control a first relay to be short circuit so as to generate a leakage current; generating an AC signal through a leakage sensor if the leakage sensor detects the leakage current; using a leakage current signal processor to convert the AC signal to a DC signal; and using a second control signal to disconnect a second relay through a latch circuit when the latch circuit receives the DC signal, and the second relay is connected to electrical appliances which are needed to protect.

7 . The leakage current protection method of claim 6 , further comprising:
using the first control signal to disconnect the first relay if the leakage current is determined as a test leakage current generated by a self-detection procedure; using a third control signal to unlock the latch circuit; and using the second control signal to make the second relay be conducted.

8 . The leakage current protection method of claim 7 , further comprising:
using an alarm unit to issue an alarm sound if determining the self-detection procedure is not being executed when the latch circuit uses the second control signal to disconnect the second relay.

9 . The leakage current protection method of claim 7 , further comprising:
using a communication unit to send an alarm message if determining the self-detection procedure is not being executed when the latch circuit uses the second control signal to disconnect the second relay.

10 . The leakage current protection method of claim 9 , further comprising:
receiving a remote start signal of a remote server through the communication unit; and sending the third control signal to unlock the latch circuit if determining the remote start signal is received.

Assignees

• Aver Information Inc

Inventors

• Lee Te-Hua
• Hsieh Wen-Ming

Classifications

• H02H3/02 Primary

  Details · CPC title

• H02H3/335 Primary

  the main function being self testing of the device · CPC title