Control unit for thyristors of a cycloconverter

Details Control unit for thyristors of a cycloconverter Control unit for thyristors of a cycloconverter

1976-05-10

1977-09-20

Shoop, William M.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363161, H02M 7155

Patent

active

040500071

ABSTRACT:
A control unit for the thyristors of a cycloconverter is disclosed. The thyristors are supplied by a three phase network and the control unit is also responsive to such network. In particular, in the control unit a measuring voltage is derived from a phase voltage, and phase-shift means and smoothing means are provided to shift the phase of the measuring voltage so that its zero crossing is in the vicinity of the zero crossing of a phase voltage. The phase-shifted measuring voltage is then fed to a sawtooth integrator which generates a sawtooth voltage in dependence on the zero crossing of the applied phase-shifted measuring voltage. The sawtooth voltage is then used to generate firing commands for the thyristors.

REFERENCES:
patent: 3265933 (1966-08-01), Perry et al.
patent: 3727079 (1973-04-01), Garrett
patent: 3852654 (1974-12-01), Gyugyi et al.
patent: 3891912 (1975-06-01), Watanabe

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