Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1996-04-12
1997-09-16
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
323283, H02M 3335, G05F 156
Patent
active
056687060
ABSTRACT:
This invention relates to a load driving circuit having a fail-safe breaking mechanism for breaking a primary power source when a failure occurs. This invention also relates to a load driving circuit capable of saving electricity in driving an inductive load and reducing a delay in stopping the load. The breaking mechanism for braking the primary power source has no contact. The load driving circuit includes a power supply circuit involving a semiconductor switching element that turns ON and OFF the supply of power to the load. There is arranged a detector for detecting a failure in the semiconductor switching element. When detecting a failure, the detector provides an output signal to activate the breaking mechanism. To drive the inductive load, the power supply circuit may have two power supply sources. In response to a load driving instruction signal, the two power supply sources together apply a high voltage to the load. After a predetermined period, one of the power supply sources is stopped, and during a steady-state operation of the load, the remaining power source applies a low voltage to the load. The load driving instruction signal may be used to provide a pulse width modulated output, which is used to supply power to the load through a transformer. During a steady-state operation of the load, this arrangement supplies a voltage lower than an operation start voltage to the load, to thereby reduce power consumption and a delay in stopping the load.
REFERENCES:
patent: 4661880 (1987-04-01), Futsuhara
patent: 4757417 (1988-07-01), Futsuhara
patent: 4764856 (1988-08-01), Rausch
patent: 4795921 (1989-01-01), Kato et al.
Futsuhara Koichi
Sakai Masayoshi
Nguyen Matthew V.
Nippon Signal Co., Ltd.
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