Thyristor control circuit
AssigneeAtmos Corporation
InventorJames W. Morriss
Life of this patent
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Abstract
A circuit for linearizing the power output of a thyristor uses a threshold switch to pulse the thyristor into the conducting mode. An accumulating capacitor provides a current to operate the threshold switch. The current that charges the accumulating capacitor arises in a DC amplifier and absolute value of sine current source. The accumulating capacitor may discharge either through the threshold switch or through a shunt switch if the threshold has not been attained within a predetermined time period. The timing device for the shunt switch is a sync pulse supply that keys off the absolute value of sine current source.
Claims11
In a thyristor circuit for controlling high-power AC signals, a circuit for linearizing the thyristors control response, comprising:
- means for generating a variable level DC signal;
- means for generating an absolute value of sine signal;
- means for accumulating said two signals to provide a signal level that may reach a threshold level;
- means in communication with the accumulating means for activating the thyristor in response to the threshold level by discharging the accumulating means;
- and means for periodically discharging the accumulating means if the threshold level is not reached within the period of the sine signal.
A circuit for linearizing the response of a thyristor AC signal controller, comprising:
- a DC transistor current amplifier;
- a field-effect-transistor current regulator in circuit with the transistor current amplifier;
- a variable signal source in communication with the field-effect-transistor current regulator;
- an AC signal source;
- a transistor amplifier responsive to the positive-going half of the AC power signal;
- a transistor amplifier in complementary circuit with the positive-going transistor amplifier and responsive to the negative-going half of the AC power signal;
- a transistor inverter in circuit with the positive-going and negative-going transistor amplifiers;
- an accumulator capacitor in circuit with the DC transistor current amplifier and the transistor inverter;
- an accumulator resistor in circuit with the accumulator capacitor;
- a unijunction transistor in circuit with the accumulator capacitor;
- a transistor shunting switch in circuit with the accumulator capacitor;
- a transistor impulse generator in circuit with the transistor shunting switch, the positive going transistor amplifier, and the negative-going transistor amplifier.
Dependencies are inferred from the claim text.