Low arc AC contactor
First Claim
1. A low arc AC contactor comprising an on/off mechanism (2) of electromagnetic-controlled contacts having coils L1, L2 for converting electric energy into magnetic energy, whereby allowing the contacts to be in engaging or disengaging condition, characterized in that, said contactor further comprises:
- a pulse power source generating circuit (1) in which its input is connected to R and T terminals for providing two pulse power sources, and both are controllably connected to coil L1 and coil L2 respectively, and a low arc trigger generating circuit (3) in which a pulse DC voltage signal generated by said pulse power source generating circuit (1) is received in order to establish a time coordinate signal of the lowest potential in an AC power source cycle, and an external trigger on/off controlling command is received to provide with on-command trigger pulse to said pulse power source generating circuit (1) so that a strong pulse magnetic field is generated in coil L1, thus resulting in the contacts being in engaging condition, as well as to provide with off-command trigger pulse or an power outage auto-cutout trigger pulse to said pulse power source generating circuit (1) so that a strong pulse magnetic field is generated in coil L2, thus resulting in the contacts being in disengaging condition.
2 Assignments
0 Petitions
Accused Products
Abstract
A low arc AC contactor comprises an on/off mechanism electromagnetic-controlled contact, a pulse power source generating circuit, a low arc trigger generating circuit, and a multifunctional fault-detecting circuit. The contactor converts an instantaneous strong current into strong pulse magnetic field energy to actuate contacts of mechanical portion of the contactor, so that the power source load is on or off. Each of the actuating process will be controlled by the electric circuit to perform at the lowest potential of AC voltage for reducing arc'"'"'s destructive power. Moreover, the contactor uses photoelectric coupling circuits, in which it can be controlled by external low voltage signal commands, as well as providing protection from overload, phase loss, short circuit, and leakage current.
-
Citations
14 Claims
-
1. A low arc AC contactor comprising an on/off mechanism (2) of electromagnetic-controlled contacts having coils L1, L2 for converting electric energy into magnetic energy, whereby allowing the contacts to be in engaging or disengaging condition, characterized in that, said contactor further comprises:
-
a pulse power source generating circuit (1) in which its input is connected to R and T terminals for providing two pulse power sources, and both are controllably connected to coil L1 and coil L2 respectively, and a low arc trigger generating circuit (3) in which a pulse DC voltage signal generated by said pulse power source generating circuit (1) is received in order to establish a time coordinate signal of the lowest potential in an AC power source cycle, and an external trigger on/off controlling command is received to provide with on-command trigger pulse to said pulse power source generating circuit (1) so that a strong pulse magnetic field is generated in coil L1, thus resulting in the contacts being in engaging condition, as well as to provide with off-command trigger pulse or an power outage auto-cutout trigger pulse to said pulse power source generating circuit (1) so that a strong pulse magnetic field is generated in coil L2, thus resulting in the contacts being in disengaging condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
Specification