Switch device, control method of the same, and control method of transfer switch system using the same

Patent metadata

Field	Value
Publication number	US-2017359061-A1
Application number	US-201615262188-A
Country	US
Kind code	A1
Filing date	Sep 12, 2016
Priority date	Jun 8, 2016
Publication date	Dec 14, 2017
Grant date	—

Abstract

A switch device includes first and second switch units that are coupled respectively to first and second output terminals. Each of the first and second switch units includes a plurality of diodes and at least one semiconductor-controlled rectifier (SCR), where at least one of the diodes and one of the at least one SCR cooperatively permit a current to flow therethrough to a corresponding one of the first and second output terminals when each thereof operates in an ON state, and where at least one of the diodes and one of the at least one SCR cooperatively permit a current to flow therethrough from a corresponding one of the first and second output terminals when each thereof operates in an ON state.

First claim

What is claimed is:

1 . A switch device comprising:
a first input terminal; a second input terminal; a first output terminal; a second output terminal; a first switch unit that is coupled between said first input terminal and said first output terminal; and a second switch unit that is coupled between said second input terminal and said second output terminal; each of said first and second switch units including a plurality of diodes and at least one semiconductor-controlled rectifier (SCR), where at least one of said diodes and one of said at least one SCR cooperatively permit a current to flow therethrough from a corresponding one of said first and second input terminals to the corresponding one of said first and second output terminals when each thereof operates in an ON state, and where at least one of said diodes and one of said at least one SCR cooperatively permit a current to flow therethrough from a corresponding one of said first and second output terminals to the corresponding one of said first and second input terminals when each thereof operates in an ON state.

2 . The switch device of claim 1 , wherein each of said first and second switch units further includes:
a first relay that is coupled between said first input terminal and said first switch unit; and a second relay that is coupled between said second input terminal and said second switch unit.

3 . The switch device of claim 2 , wherein each of said first and second switch units further includes a third relay that is coupled between a corresponding one of said first and second relays and the corresponding one of said first and second output terminals.

4 . The switch device of claim 1 , wherein said at least one SCR of said first switch unit includes a first SCR, and said first switch unit further includes a switch that is coupled to said first SCR in parallel.

5 . The switch device of claim 4 , wherein said at least one SCR of said second switch unit includes a second SCR, and said second switch unit further includes a switch that is coupled to said second SCR in parallel.

6 . The switch device of claim 4 , wherein said switch is one of a metal oxide semiconductor field effect transistor and an insulated gate bipolar transistor.

7 . The switch device of claim 1 , wherein:
said at least one SCR of said first switch unit includes a first SCR; said diodes of said first switch unit includes:
a first diode having an anode that is coupled to said first input terminal, and a cathode,
a second diode having an anode that is coupled to said first output terminal, and a cathode that is coupled to said cathode of said first diode,
a third diode having an anode, and a cathode that is coupled to said anode of said first diode, and
a fourth diode having an anode that is coupled to said anode of said third diode, and a cathode that is coupled to said anode of said second diode; and
said first SCR has an anode that is coupled to said cathode of said first diode, and a cathode that is coupled to said anode of said third diode.

8 . The switch device of claim 1 , wherein:
said at least one SCR of said first switch unit includes a first SCR and a second SCR; said diodes of said first switch unit includes:
a first diode having an anode, and a cathode that is coupled to said first input terminal, and
a second diode having an anode that is coupled to said anode of said first diode, and a cathode that is coupled to said first output terminal;
said first SCR has an anode that is coupled to said cathode of said first diode, and a cathode that is coupled to said anode of said first diode; and said second SCR has an anode that is coupled to said cathode of said second diode, and a cathode that is coupled to said anode of said first diode.

9 . A control method for controlling a switch device according to claim 3 , the first and second input terminals of the switch device being coupled to an alternating current (AC) power source for receiving an AC voltage therefrom, said control method comprising a first procedure that is performed when the AC voltage has an amplitude which equals a predetermined value greater than zero, and that includes the steps of:
at a first time point, controlling each of the first and second relays to transition from an OFF state to an ON state; at a second time point after the first time point, controlling the at least one SCR of each of the first and second switch units to be operable between an ON state and an OFF state based on a voltage thereacross; at a third time point after the second time point, controlling the third relay of each of the first and second switch units to transition from an OFF state to an ON state; and at a fourth time point after the third time point, controlling the at least one SCR of each of the first and second switch units to disable transitioning of the at least one SCR from the OFF state to the ON state.

10 . The control method of claim 9 , further comprising a second procedure that is performed when the amplitude of the AC voltage equals zero, and that includes the step of:
controlling each of the first, second and third relays to transition from the ON state to the OFF state.

11 . The control method of claim 9 , further comprising a second procedure that is performed when the amplitude of the AC voltage is greater than zero and less than the predetermined value, and that includes the steps of :
at a fifth time point, controlling the at least one SCR of each of the first and second switch units to be operable between the ON state and the OFF state based on the voltage thereacross; at a sixth time point after the fifth time point, controlling the third relay of each of the first and second switch units to transition from the ON state to the OFF state; at a seventh time point after the sixth time point, controlling the at least one SCR of each of the first and second switch units to disable transitioning of the at least one SCR from the OFF state to the ON state; and at an eighth time point after the seventh time point, controlling each of the first and second relays to transition from the ON state to the OFF state.

12 . The control method of claim 11 , the at least one SCR of the first switch unit including a first SCR, the first switch unit further including a switch that is coupled to the first SCR in parallel, wherein said second procedure further includes the steps of:
at the seventh time point, controlling the switch to transition from an OFF state to an ON state; and at a time point after the seventh time point and before the eighth time point, controlling the switch to transition from the ON state to the OFF state.

13 . The control method of claim 11 , the at least one SCR of each of the first and second switch units including a first SCR, each of the first and second switch units further including a switch that is coupled to the first SCR in parallel, wherein said second procedure further includes the steps of:
at the seventh time point, controlling the switch of each of the first and second switch units to transition from an OFF state to an ON state; and at a time point after the seventh time point and before the eighth time point, controlling the switch of each of the first and second switch units to transition from the ON state to the OFF state.

14 . A control method for controlling a transfer switch system that includes a first switch device and a second switch device, each of the first and second switch devices being a switch device according to claim 3 , the first and second input terminals of the first switch device being coupled to a first alternati

Assignees

• Lite On Electronics Guangzhou Ltd
• Lite On Technology Corp

Inventors

• Tsai Wen-Che
• Chen Shih-Ming
• Lee Yong-Long
• Lai Jin-Yuan

Classifications

• H03K17/6871 Primary

  the output circuit comprising more than one controlled field-effect transistor · CPC title

• H03K17/567

  Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT · CPC title

• H01H2300/018

  Application transfer; between utility and emergency power supply · CPC title

• H02J9/061 Primary

  for DC powered loads · CPC title

• H03K2017/515

  Mechanical switches; Electronic switches controlling mechanical switches, e.g. relais · CPC title