Electrical transmission or interconnection systems – Wave form or wave shape determinative or pulse-producing...
Patent
1997-08-13
1999-04-20
Elms, Richard T.
Electrical transmission or interconnection systems
Wave form or wave shape determinative or pulse-producing...
372 25, H03K 300
Patent
active
058959840
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a circuit arrangement for feeding a pulse output stage.
DESCRIPTION OF RELATED ART
A circuit arrangement of this type is disclosed in DE 23 31 084 C2. The inductor is designed as an isolating transformer, in which the primary winding of a transformer is connected to a low-voltage source via a pulse-controlled transistor switching device. The secondary winding is connected to the capacitor via a rectifier arrangement.
The pulse control device comprises an arrangement for specifying the transistor base voltage and a feedback circuit from the transformer to the base of the transistor. These form a free-running circuit in which the transistor is switched on periodically by control pulses during a specific time interval. The duration of the time interval can be adjusted by varying the turns ratio for the base voltage of the transistor or varying the source voltage. The duration determines the amount of energy which is stored in the transformer and can be transferred to the capacitor. The prevailing control instants of the transistor for the on and off states are determined exclusively by the primary-side oscillator components and the resonant circuit behavior in the secondary circuit.
In the off state of the transistor, the energy stored in the transformer is transferred via the secondary winding to the capacitor. The control pulse train of the transistor is also used to generate synchronous control pulses in the discharge path of the capacitor. The triggering of the useful pulses therefore also depends on the primaryside oscillator components.
A circuit arrangement for the inductive charging of a capacitive energy charge transformation . . . !, etz-Archiv, Vol. 2 (1980), Issue 1, pp. 25 to 27. A voltage source which provides a high voltage directly charges a capacitor to the voltage of the voltage source via an inductor. By closing a switch, the capacitor is discharged in the form of a useful pulse, which is used for the pulsed excitation of a gas laser. The switch then opens automatically as a function of the discharge state of the capacitor. The amplitude of the discharge pulse is not adjustable. The charging cycle depends on the operating conditions.
Output stages of the type mentioned in the introduction supply voltage pulses having a low internal resistance and enable loads which are to be operated in a pulsed manner to be supplied with power. Such loads include pulsed diode lasers, inter alia. Pulse voltages of up to 100 volts are typically required here for diodes in the power range of a few tens of watts peak power. For larger pulse powers, far higher voltages will be necessary. Pulse repetition rates of several 10 kHz are customary here. Amplitude adjustment by changing the pulse voltage is additionally required.
For such output stages, use is frequently made of thyristors (cf. UNITRODE Inc., Design note 15) or MOS power transistors such as, for example, MOS field-effect transistors (MOS-FET) (cf. SILICONIX Inc., Application note "6.13.10 Laser Diode Pulsers"). Such a customarily used circuit arrangement is illustrated in FIGS. 7 and 8 using the example of a drive arrangement for a diode laser for the purposes of elucidation. A diode laser 2 as load, a capacitor 4 and a switching device in the form of a MOS-FET 1 (FIG. 7) or thyristor 6 (FIG. 8) are connected in series. The capacitor 4 is charged to a suitably high voltage by a charging circuit 3 (FIG. 7) or 5 (FIG. 8). The charging voltage is provided by a voltage source 7, which is connected to the capacitor 4, as is shown in FIGS. 7 and 8, by means of a transistor 8 (FIG. 7) or MOS-FET 15 (FIG. 8) as switching element via a resistor 9, which is in this case intended to encompass all of the lead impedances and internal resistances. In FIG. 8, a protective diode 11 is reverse-connected in parallel with the diode laser 2.
When the MOS-FET 1 or the thyristor 6 is driven, it connects the diode laser 2 to the charged capacitor 4. The latter is almost completely discharged by a current pulse flowing thro
REFERENCES:
patent: 3628048 (1971-12-01), Lee et al.
patent: 3898588 (1975-08-01), Skagerlund
patent: 5736881 (1998-04-01), Ortiz
B. Stadler, "Die Ladungstransformation, eine Methode zur Aufladung kapazitiver Speicher fur Impulsanwendungen", Archiv Bd., vol. 2, pp. 25-27 .
Elms Richard T.
Leica Geosystems AG
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