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Self De Energizing Load Driver Circuit

IP.com Disclosure Number: IPCOM000092779D
Original Publication Date: 1967-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Chang, D: AUTHOR [+2]

Abstract

A tank circuit is formed and oscillations occur when a transformer is employed to charge a capacitive load circuit such as an electro-optic crystal. Rapid damping of the oscillatory ringing of this tank circuit is provided by this self de-energizing circuit.

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Self De Energizing Load Driver Circuit

A tank circuit is formed and oscillations occur when a transformer is employed to charge a capacitive load circuit such as an electro-optic crystal. Rapid damping of the oscillatory ringing of this tank circuit is provided by this self de-energizing circuit.

Transformer 1 drives electro-optic crystal 2 through blocking diode 3. Energization of crystal 2 through transformer 1 is accomplished from a transistor circuit formed of transistors 4 and 5. De-energization is accomplished by an auxiliary circuit including transistor 6, inductor 7, and resistor 8.

A negative change in the input voltage level raises the voltage level at the collector of transistor 4 and therefore at the base of transistor 5. The latter conducts and current i flows through transformer 1. The voltage Vt rises to charge crystal 2. The circuit formed by inductor 7 and resistor 8 differentiates current i.

The voltage provided by this network is applied at the base of transistor 6. The latter conducts the stray energy of the transformer 1 windings to dissipate this energy. The transformer 1 output is clamped in rapid manner, eliminating any ringing in the circuit.

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