US 4,124,886 AGranted

Generation of low frequency, high voltages

AssigneeCounting Instruments Limited

InventorsIan A. Black, Rodney Miller

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Abstract

A circuit arrangement for applying low frequency high voltage waveforms across a load and which includes low and high voltage circuits. The low voltage circuit includes a sinusoidal signal generator for producing a low voltage electrical waveform, and a transmitter circuit having first and second light emitting diode circuits by which first and second light signals are generated which are transmitted to the high voltage circuit by respective fibre optic light guides. The high voltage circuit includes first and second high voltage d.c. supplies and first and second triode valves. Grid modulation devices are associated with the first and second triode valves and are respectively responsive to the first and second light signals transmitted via the fibre optic light guides for varying the current through said first and second triode valves and the load in direct proportion to the positive and negative variations of said low voltage electrical waveform to thereby reproduce the positive and negative variations of the low voltage waveform at high voltage across the load.

Claims8

Dependent claims

A circuit arrangement for applying low frequency high voltage sinusoidal waveforms across a load comprising,

(a) a low voltage circuit having
(i) a sinusoidal signal generator for producing a low voltage sinusoidal electrical waveform, and
(ii) a transmitter circuit having a first light emitting circuit means linearly responsive to positive portions of said low voltage sinusoidal electrical waveform for producing a first light signal, the light intensity of said first light signal being proportional to the positive variations of said low voltage sinusoidal electrical waveform, and a second light emitting circuit means responsive to negative portions of said low voltage sinusoidal electrical waveform for producing a second light signal, the light intensity of said second light signal being proportional to negative variations of said low voltage sinusoidal electrical waveform,
(b) first and second light transmission means for transmitting said first and second light signals, and
(c) a high voltage circuit having
(i) first and second high voltage d.c. supply means,
(ii) a first electronic control device connected in series with said load and said first high voltage d.c. supply means such that current may flow in a first direction through said load,
(iii) a second electronic control device connected in series with said load and said second source of high voltage d.c. supply such that current may flow in a second direction through said load, said second direction being opposite from said first direction, said first electronic control device having an electronic control element means responsive to said first light signal transmitted from said first transmission means for varying the current through said first electronic control device and said load in direct proportion to the positive variations of said low voltage sinusoidal electrical waveform thereby reproducing at a positive high voltage across said load the positive variations of said low voltage sinusoidal waveform, and said second electronic control device having an electronic control element means responsive to said second light signal transmitted from said second transmission means for varying the current through said second electronic control device and said load in said second direction opposite from said first direction, in direct proportion to the negative variations of said low voltage sinusoidal electrical waveform thereby reproducing at a negative high voltage across said load the negative variations of said low voltage sinusoidal waveform.

5 more elements

A circuit arrangement for applying low frequency high voltage sinusoidal waveforms across a load comprising,

(a) a low voltage circuit having
(i) a sinusoidal signal generator for producing a low voltage sinusoidal electrical waveform, and
(ii) a transmitter circuit having a first light emitting diode circuit means linearly responsive to positive portions of said low voltage sinusoidal electrical waveform for producing a first light signal, the light intensity of said first light signal being proportional to the positive variations of said low voltage sinusoidal electrical waveform, and a second light emitting diode circuit means responsive to negative portions of said low voltage sinusoidal electrical waveform for producing a second light signal, the light intensity of said second light signal being proportional to the negative variations of said low voltage sinusoidal electrical waveform,
(b) first and second fibre optic light transmission means for transmitting said first and second light signals, and
(c) a high voltage circuit having
(i) first and second high voltage d.c. supply means,
(ii) a first thermionic triode valve connected in series with said load and said first high voltage d.c. supply means such that current may flow in a first direction through said load,
(iii) a second thermionic triode valve connected in series with said load and said second source of high voltage d.c. supply such that current may flow in a second direction through said load, said second direction being opposite from said first direction,
(iv) first grid modulating means connected to the grid of said first triode valve and responsive to said first light signal transmitted from said first transmission means for varying the current through said first triode valve and said load in direct proportion to the positive variations of said low voltage sinusoidal electrical waveform thereby reproducing at a positive high voltage across said load the positive variations of said low voltage sinusoidal waveform, and
(v) second grid modulating means connected to the grid of said second triode valve and responsive to said second light signal transmitted from said second transmission means for varying the current through said second triode valve and said load in said second direction opposite from said first direction, in direct proportion to the negative variations of said low voltage sinusoidal electrical waveform thereby reproducing at a negative high voltage across said load the negative variations of said low voltage sinusoidal waveform.

7 more elements

A circuit arrangement for applying low frequency high voltage waveforms across a load comprising,

(a) a low voltage circuit having
(i) a sinusoidal signal generator for producing a low voltage sinusoidal electrical waveform, and
(ii) a transmitter circuit having a first light emitting diode circuit means linearly responsive to positive portions of said low voltage sinusoidal electrical waveform for producing a first light signal, the light intensity of said first light signal being proportional to the positive variations of said low voltage sinusoidal electrical waveform, and a second light emitting diode circuit means responsive to negative portions of said low voltage sinusoidal electrical waveform for producing a second light signal, the light intensity of said second light signal being proportional to the negative variations of said low voltage sinusoidal electrical waveform,
(b) first and second light transmission means for transmitting said first and second light signals, and
(c) a high voltage circuit having
(i) first and second high voltage d.c. supply means,
(ii) a first electronic control device connected in series with said load and said first high voltage d.c. supply means such that current may flow in a first direction through said load, said first electronic control device comprising a first plurality of parallel circuit branches each of which contains at least two series connected thermionic triode valves,
(iii) a second electronic control device connected in series with said load and said second source of high voltage d.c. supply such that current may flow in a second direction through said load, said second direction being opposite from said first direction, said second electronic control device comprising a second plurality of parallel circuit branches each of which contains at least two series connected thermionic triode valves,
(iv) first grid modulating means connected to the grids of the triode valves of said first electronic control device and responsive to said first light signal transmitted from said first transmission means for varying the current through said triode valves of the first electronic control device and said load in direct proportion to the positive variations of said low voltage sinusoidal electrical waveform thereby reproducing at a positive high voltage across said load the positive variations of said low voltage sinusoidal waveform, and
(v) second grid modulatng means connected to the grids of the triode valves of said second electronic control device and responsive to said second light signal transmitted from said second transmission means for varying the current through said triode valves of said second electronic control device and said load in said second direction opposite from said first direction, in direct proportion to the negative variations of said low voltage sinusoidal electrical waveform thereby reproducing at a negative high voltage across said load the negative variations of said low voltage sinusoidal waveform.

7 more elements

A circuit arrangement for applying low frequency high voltage waveforms across a load comprising,

(a) a low voltage circuit having
(i) a signal generator for producing a low voltage electrical waveform, and
(ii) a transmitter circuit having a first light emitting circuit means linearly responsive to positive portions of said low voltage electrical waveform for producing a first light signal, the light intensity of said first light signal being proportional to the positive variations of said low voltage electrical waveform, and a second light emitting circuit means linearly responsive to negative portions of said low voltage electrical waveform for producing a second light signal, the light intensity of said second light signal being proportional to the negative variations of said low voltage electrical waveform,
(b) first and second light transmission means for transmitting said first and second light signals, and
(c) a high voltage circuit having
(i) first and second high voltage d.c. supply means
(ii) a first electronic control device connected in series with said load and said first high voltage d.c. supply means such that current may flow in a first direction through said load,
(iii) a second electronic control device connected in series with said load and said second source of high voltage d.c. supply such that current may flow in a second direction through said load, said second direction being opposite from said first direction, said first electronic control device having an electronic control element means responsive to said first light signal transmitted from said first transmission means for varying the current through said first electronic control device and said load in direct proportion to the positive variations of said low voltage electrical waveform thereby reproducing at a positive high voltage across said load the positive variations of said low voltage waveform, and said second electronic control device having an electronic control element means linearly responsive to said second light signal transmitted from said second transmission means for varying the current through said second electronic control device and said load in said second direction opposite from said first direction, in direct proportion to the negative variations of said low voltage electrical waveform thereby reproducing at a negative high voltage across said load the negative variations of said low voltage waveform.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/767,733Filed 11 Feb 1977 · continuation in part
Priority: GB 29498/743 Jul 1974
Granted: 7 Nov 1978
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

H02M 7/533
Using devices of a triode or transistor type requiring continuous application of a control signal: using discharge tubes only
H02M 1/092
For the simultaneous control of series or parallel connected semiconductor devices: the control signals being transmitted optically
H02M
Apparatus for conversion between ac and ac, between ac and dc, or