| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 61 | Power supply negative phase detecting circuit | US09915655 | 2001-07-26 | US20020027432A1 | 2002-03-07 | Eiji Oohashi |
| A power supply negative-phase detecting circuit (10) for electronic equipment (12) using a three-phase AC power supply source includes a pulse generator (13) for generating a first pulse indicating the phase difference between any pair of two phases of three-phase AC power to be supplied to the electronic equipment and a second pulse indicating the phase difference between another pair of two phases of the three-phase AC power, a differentiating circuit (25) for generating a third pulse from the second pulse in synchronism with the rise-up of the second pulse so that the third pulse has a pulse width smaller than the phase difference between the first and second pulses, and a switching unit (14) for subjecting the first pulse and the third pulse to OR operation and turning on/off the power supply to be supplied to the electronic equipment on the basis of the OR operation result of the first and third pulses. | ||||||
| 62 | Air-conditioning apparatus including an indoor unit and an outdoor unit having its compressor driven by a three-phase AC power supply | US636429 | 1990-12-31 | US5062278A | 1991-11-05 | Akiyoshi Sugiyama |
| An air-conditioning apparatus includes a control circuit adapted to detect, from among first to third line voltages of a three-phase AC power supply, the second or third line voltage not synchronizing with a serial signal. The control circuit detects a difference between a phase angle of the detected line voltage and that of the serial signal, compares the difference with set values and determines, by that comparison, whether the three-phase AC power supply is in a positive-phase sequence or in a negative-phase sequence. The operation of a compressor is inhibited when the negative-phase sequence is determined by the control circuit. | ||||||
| 63 | Opposite phase detecting device for alternating current electrical equipment | US482787 | 1990-02-21 | US5057963A | 1991-10-15 | Yukihiko Hatano |
| An opposite phase detecting device for alternating current electrical equipments includes a zero cross circuit synchronizing positive half waves of first and second line voltages of a three-phase AC supply supplied to an AC electrical equipment and generating first and second synchronizing pulses each having a pulse width corresponding to an electrical angle of approximately 180 degrees, a counter circuit counting the first synchronizing pulses from the zero cross circuit, a one-shot multivibrator triggered by the second synchronizing pulse to thereby generate a reset pulse having a relatively short time interval, and an AND circuit generating a reset signal based on a logical multiplication of the reset pulse generated by the pulse generating circuit and the first synchronizing pulse generated by the synchronous circuit. The counter circuit is reset when supplied with the reset signal from the AND circuit. The counter circuit generates an opposite phase detection signal when the count value thereof reaches a predetermined value. | ||||||
| 64 | Control circuitry including phase failure relay | US24640 | 1987-03-11 | US4802053A | 1989-01-31 | Roger C. Wojtak; John S. Hoelzer; James T. Libert |
| A system for sensing the phase of a three-phase AC system and detecting phase reversal and undervoltage and phase unbalance and for providing a switching function when the system is not functioning properly. | ||||||
| 65 | Fault detector for a three-phase alternating current supply | US900043 | 1986-08-25 | US4751653A | 1988-06-14 | Brian S. Junk; Robert E. Krocker; Tony J. Wood |
| A microcomputer based fault detector for identifying a phase reversal, a phase loss, and a power loss in three-phase circuits. A microcomputer samples a pattern of timing signals generated in response to three current transformers associated with each of the three phases. The changing pattern of timing signals represent the phase relationship of each of the three phases. The sampling rate of the microcomputer is synchronized to the alternating current in each of the three phases by an interrupt signal indirectly generated by one of the phases. In the absence of current in this interrupt generating phase, a backup interrupt, internal to the microcomputer, is enabled which directs the microcomputer to determine if the absence of the first interrupt is due to a phase loss or a power loss. Either interrupt prompts the microcomputer to sample the pattern of signals and compare it to a predetermined pattern. By counting any deviant patterns and classifying them as characteristic of either a phase reversal, phase loss, or power loss, the microcomputer identifies the specific fault as the occurrence of a predetermined number of deviant patterns within a classification. | ||||||
| 66 | Phase balance monitoring system incorporating voltage and phase sequence monitoring | US886299 | 1978-03-13 | US4199798A | 1980-04-22 | Elton D. Leppke; Russell P. Schuchmann |
| A phase unbalance detecting system that includes also low-voltage detection and wrong-phase-sequence detection. The system can be packaged in a small volume because it is a solid state type that uses a minimum of electronics and does not require transformers for obtaining signals from the several phases of the plural-phase power line but only one transformer for the D.C. power supply circuit for the detection system. The system incorporates means for allowing it to be used at 50 or 60 Hz without separate adjustment, for making it insensitive to noise and harmonics of the power line, and for providing a good estimate of the negative sequence voltage caused by a phase unbalance. It provides external terminals whereby it can be adapted for use at different power line voltages. | ||||||
| 67 | Safety apparatus for use with a three-phase AC motor | US872886 | 1978-01-27 | US4163270A | 1979-07-31 | Louis J. Marus |
| Safety apparatus for use with a three-phase AC hoist motor adapted to be connected to a three-phase AC power source, motor rotation being correct if the motor is connected to the source in correctly phased relationship but incorrect if connected with an incorrectly phased relationship.Phase detection circuitry is provided for detecting the phase relationship of said AC power provided by the power source connection and for providing a signal indicative of an incorrect phase relationship. Phase corrector circuitry of the apparatus is operative when enabled for correcting the phase relationship of the AC power provided from said source to the motor. Circuitry is included for functionally interconnecting the phase detector circuitry and the phase corrector circuitry for enabling operation of the latter in response to said signal, thereby ensuring operation of the motor in a correct direction regardless of incorrect phasing provided by the connection to the power source. | ||||||
| 68 | Chiller controls | US651386 | 1976-01-22 | US4084406A | 1978-04-18 | Daniel A. Brenneman |
| A solid state starter for a chiller compressor motor mounts directly on the compressor motor and comprises a bank of SCR's which are controllably switched to conduct current to the motor for starting and running. Electronic control modules are provided including a trigger module for triggering the SCR's, a current module (including current overload protection) for controlling the trigger module so that motor current is controllably delivered to the motor, and a voltage safety module for protecting against electrical faults. The SCR's are cooled by liquid refrigerant. | ||||||
| 69 | Phase loss detector | US616911 | 1975-09-26 | US4008417A | 1977-02-15 | James P. Donovan |
| An electronic monitoring circuit to detect unbalanced voltage conditions on a three phase alternating current line employs the charging current to a condenser connected across a full wave rectifier bridge to trigger a multivibrator circuit that controls an output relay in accordance with the multivibrator cycles per cycle of the power line voltage. | ||||||
| 70 | Wiring integrity system | US470181 | 1974-05-15 | US3946282A | 1976-03-23 | Hubert Leger Weiss; Ernest Josef Dinkel |
| A temporary or portable electrical distribution system includes a distribution box supplied with power by a flexible cable. Field repairs carelessly made or other causes may result in wires being transposed or open. To eliminate hazards and to ensure proper operation of equipment, sensing means including simple circuitry in the distribution box prevents operation of a master box switch except upon the verification of proper wiring. | ||||||
| 71 | Phase sequence and phase loss monitor | US3611050D | 1970-06-25 | US3611050A | 1971-10-05 | WEBER CLEMENT J |
| Solid-state circuitry offering protection to electrical and electronic equipment from incorrect phase sequence connection, low voltage or a phase failure on a three-phase power system. If phasing is correct and full line voltage is present on all three phases, an internal control relay is energized, where, in a contrary situation, the aforesaid control relay becomes deenergized. The monitor represents an important safety device where connection to the powerline is critical, or where loss of voltage or of one or more phases may cause damage to electrical equipment.
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| 72 | Phase sequence sensing circuit | US3364363D | US3364363A | 1968-01-16 | IORDANIDIS DEMETRE | |
| 73 | Phase sequence indicator including double throw switching means | US4320460 | 1960-07-15 | US3156868A | 1964-11-10 | MURRILLS WILLIAM C |
| 74 | Electromagnetic control device | US6976136 | 1936-03-20 | US2125149A | 1938-07-26 | HENRY BRUNS WILLIAM |
| 75 | Network system of distribution | US12820437 | 1937-02-27 | US2121608A | 1938-06-21 | PARSONS JOHN S; HARRISON GEORGE O |
| 76 | Network distribution system | US15677637 | 1937-07-31 | US2121594A | 1938-06-21 | HARRISON GEORGE O |
| 77 | Phase failure and phase reverse protective device for polyphase alternating current circuits | US28626228 | 1928-06-18 | US1826099A | 1931-10-06 | STEVENS WILLIAM C |
| 78 | Phase failure and phase reversal protective device | US40113329 | 1929-10-21 | US1823211A | 1931-09-15 | POSSELT EDWARD J |
| 79 | Phase-failure protection | US5317625 | 1925-08-28 | US1637043A | 1927-07-26 | JONES BENJAMIN W |
| 80 | Electromagnetic device for alternating-current circuits | US51456821 | 1921-11-12 | US1620555A | 1927-03-08 | JONES BENJAMIN W; WOLFE NOBLE A |
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