| ASCO Power Technologies, L.P. Patent applications |
| Patent application number | Title | Published |
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| 20120125894 | ARC EXTINGUISHING SWITCH AND SWITCHING METHOD THEREOF - The present invention discloses an arc extinguishing switch, including a mechanical switch and a first electric branch connected in parallel with a first contact branch of the mechanical switch, the first electric branch includes a first controllable unidirectional turn-on subbranch and a second controllable unidirectional turn-on subbranch, the first controllable unidirectional turn-on subbranch and the second controllable unidirectional turn-on subbranch are respectively controlled by two thyristors to be turned on in AC positive and negative periods correspondingly and share a first capacitor connected in series with the two thyristors. The invention further discloses a switching method using the arc extinguishing switch. In the invention, the high power requirement for the thyristor in the arc extinguishing switch and the product cost are lowered, and it is avoided that the mechanical switch is bypassed when the short-circuit failure occurs on the thyristor. | 05-24-2012 |
| 20110292551 | ARC EXTINGUISHING HYBRID TRANSFER SWITCH AND SWITCHING METHOD - The present invention discloses an arc extinguishing hybrid transfer switch, including a mechanical switch and a first thyristor branch connected in parallel with the first contact branch of the mechanical switch, wherein the first thyristor branch includes a first thyristor, a second thyristor, a first polarized capacitor and a second polarized capacitor, the first thyristor and the first polarized capacitor are connected in series in the same direction, the second thyristor and the second polarized capacitor are connected in series in the same direction, and a branch consisted of the first thyristor and the first polarized capacitor and a branch consisted of the second thyristor and the second polarized capacitor are connected in parallel in reverse direction. The invention further discloses a switching method for the arc extinguishing hybrid transfer switch for implementing an arc extinguishing of a mechanical switch. In the invention, a low-power thyristor may be used, thus the cost of the switch may be lowered greatly. Moreover, the thyristor may be replaced by the polarized capacitor for implementing the arc extinguishing when a short-circuit failure occurs on the thyristor. Thus, the load current is lowered greatly and the influence of thyristor failure on the load is reduced. | 12-01-2011 |
| 20110169531 | Methods and Systems for Detection of Zero Crossings in a Signal - Methods and systems for detection of zero crossings in a signal are described. For example, true zero crossings in an alternating voltage power source signal can be detected in the presence of noise pulses. The zero crossing detections are performed by establishing a value of a signal status counter, and at a repeating interval if the signal is a logic low value, the value of the signal status counter is decremented if the signal status counter is greater than a first value otherwise a flag is set to enable detection of a zero crossing in the signal. In addition, at the repeating interval, if the signal is a logic high value, the value of the signal status counter is incremented, and if after incrementing the signal status counter is equal to a second value and the flag is set, a zero crossing of the signal is declared. | 07-14-2011 |
| 20080245645 | Three-position apparatus capable of positioning an electrical transfer switch - A multi-position apparatus for use with a system operated in at least three distinct positions. The apparatus comprises (i) a position-selection mechanism, (ii) a first link mechanism and a second link mechanism, each link mechanism being operably coupled with the position-selection mechanism, (iii) a first weight-actuated spring mechanism operably coupled with the first link mechanism, (iv) a second weight-actuated spring mechanism operably coupled with the second link mechanism, (vi) a first output-actuating member operably coupled with the first weight-actuated spring mechanism, the first output-actuating member being arranged to operably communicate with the system, and (vii) a second output-actuating member operably coupled with the second weight-actuated spring mechanism. In one example, the system may be an electrical transfer switch having two separate set of electrical contacts. | 10-09-2008 |
