Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1980-10-28
1982-12-28
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307243, 307595, H03K 1712, H03K 1728
Patent
active
043663958
ABSTRACT:
The output of the circuit is connected to the grid of an X-ray tube (X) by a long cable having a large capacitance (C.sub.c). A 25 kHz variable amplitude drive circuit (1) applies a continuous DC regulating voltage to a first rail (RL2) via a first transformer (T1), rectifier (D1, D2) and a filter (F1). A 25 kHz fixed amplitude drive circuit (2) periodically generates a blanking voltage which is applied to a second rail (RL3) via a second transformer (2), rectifier (D3, D4) and a Zener diode (Z1). The first rail (RL2) is coupled to the second rail (RL3) via a clamping diode (D.sub.c) which is reversed biased by the blanking voltage, so that the regulating voltage is overriden. In order to quickly discharge the large capacitance (C.sub.c) to achieve a rapid transition from blanking voltage to regulating voltage, a discharge path is connected across the output, the path including a transistor (T1). A control circuit (3) comprises a capacitor (C2) which stores an actuating voltage (V.sub.T) produced when the blanking voltage is produced. The circuit (3) also comprises an RC network (R1, C1), in parallel with the control circuit capacitor (C2), the RC junction being connected to the base of the transistor (T1) and to the second rail (RL3). When the blanking voltage is produced the RC junction is maintained at a high voltage and the transistor (T1) is non conductive. During the transition from blanking to regulating, the RC network defines a desired transition voltage which is applied by the transistor (T1) ro the second rail (RL3) and this controls the discharge of the cable capacitance.
REFERENCES:
patent: 3602825 (1971-08-01), Senior
patent: 3643111 (1972-02-01), Deyo
Gillard Richard G.
Oliver Colin C.
EMI Limited
Heyman John S.
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