High voltage solid state relay

Details High voltage solid state relay High voltage solid state relay

1982-09-13

1985-07-16

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307252B, H03K 1772

Patent

active

045298882

ABSTRACT:
A solid state relay capable of switching highly inductive loads at voltages of about 480 volts RMS employs anti-parallel connected thyristors in one embodiment. The thyristors are controlled by respective pilot thyristors which inject current into the gates of the main power thyristors when the main power thyristors are to become conductive. The pilot thyristors are driven from a low voltage circuit which is insulated from the high voltage power circuit. The anode-to-cathode circuit of each of the pilot thyristors is connected in series with the secondary winding of a transformer having a primary winding which carries the main power current. When either of the main thyristors becomes conductive, the appropriate secondary transformer winding induces a voltage in the corresponding pilot thyristor circuit which turns off the pilot thyristor. The circuit ensures turn-on of the main power thyristors even under very highly inductive loads. In a second embodiment, the main thyristors are replaced by a single triac.

REFERENCES:
patent: 3588598 (1971-06-01), Isaacs
patent: 3793581 (1974-02-01), Ortgies, Jr.
patent: 4039866 (1977-08-01), Komuro et al.
patent: 4338546 (1982-07-01), Ehret et al.

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