SU517190A1 - Device for power supply of laser pumping lamps - Google Patents

Description

reliability and often failed.

The proposed device for powering pumping lamps of an laser operating in both single and frequently repeated flashes, with continuously adjustable pumping energy, contains, like the well-known, a power transformer connected to its primary winding and a power key element, a power rectifier connected to the secondary winding of a power transformer and serving to charge a working capacitor discharged to a pulse transformer; ignition of the lamps, and a threshold element connected by one input to the working capacitor.

A distinctive feature of the proposed device is that parallel to the first winding of a power transformer and in series with a power key element a chain is included consisting of a capacitor and in series with it an auxiliary key element made on two opposite-parallel connected low-power thyristors. The control input of the auxiliary key element is connected to the pulse output of the threshold element, to the potential output of which the control pulse generator is connected. The blocking input of the threshold element is connected to one of the outputs of the clock generator, the other output of which is connected to a pulse ignition transformer. To the control input of the power key, the element is connected to the Control Pulse Generator, the triggering input of which is connected to the output of the pulse shaper synchronized with the mains voltage.

This embodiment of the device increases its reliability.

FIG. 1 image of the scheme of the proposed device; . Fig. 2 shows voltage graphs at various points in the circuit.

 The device for powering the laser pump lamps contains a power transformer 1, the primary circuit of which includes inductance 2 and a power key element made on counter-parallel connected thyristors 3 and 4. Parallel to the primary winding of the power transformer 1 and in series with the power key, the chain is connected auxiliary key element made on two oppositely connected low-power thyristors 5 and 6 and in series with it an included capacitor 7, shuntiro resistor 8. A power rectifier .9 is connected to the secondary winding of the power transformer 1, to the output of which is connected a working capacitor 10 discharging to the pulse transformer 11 that ignites the pumping pulse lamp 12. The threshold element 13 is connected to the working capacitor 10 by one input, the pulse output 14 of which is connected to the control input of the auxiliary key element, and the potential output 15 is connected to the input of the control pulse generator 16, the output of which is connected to the control input of the power key element. It also has 17 clock pulses generator, one output 18 of which is connected to pulse ignition transformer 11, and the other its output 19 - to the blocking input of threshold element 13. The control input of generator 16 of control pulses is connected to pulse generator 20 of pulses.

synchronized with the mains voltage.

The device works as follows. When the mains voltage is turned on (msg tg in fig. 2) threshold, ale. ment 13 through its potential output

15, a supply voltage is supplied to the control pulse generator 16. However, the generation in it starts only with the ms t, when a pulse synchronous with the moment arrives at its triggering input from the pulse generator 20. the voltage drop at the output of the rectifier 9 to zero.

From the moment the pulses arrive at the power key element, the power transformer 1 is connected to the mains and the charge of the working capacitor 10 begins. This process continues until the voltage on the capacitor 10 reaches the required value UH (time tj.). At this moment, the voltage at the potential output 15 of the threshold element 13, which supplies the control pulse generator 16, is supplied to zero, and

5, the .16 generator is turned off. From the pulse output 14 of the threshold element 13, the control pulse is fed to the input of the auxiliary key element, and depending on the polarity of the network voltage, one of its thyristors 5 or 6 is opened at a given time. Due to this, a discharged capacitor 7 is connected to power input power key element. Since a discharged capacitor at the moment of supplying voltage to it is an element with resistance close to zero, the potential at point A (Fig. 1) for a short period of time Q is almost equal to the potential at point B. This self reaches reliable locking of the open thyristor of the power key element, and interruption of the process of charging the working capacitor 10. Inductance 2 ensures

cashing locking open thyristor

power key element and also protects the power network from impulse overloads and ncwex.

At time tj from the output 18 of the generator 17 clock pulses of the pulse transformer 11 receives a pulse of ignition of the lamp 12 of the pump. Over a period of time tj-t, the working capacitor 10 discharges onto the pump lamp 12 and the voltage across the terminal 10 drops. However, the threshold element 13, the comparing input of which is connected to the operating capacitor 10, continues to remain in the same position and does not supply the supply voltage to the generator 16 of control pulses, since the timing input 13 is fed to the blocking input of the threshold element 13 from the output 19 of the generator 17 time). The duration of the timing pulse must be known to be longer than the discharge time of the working capacitor 10 per pump laser pump lamp. This eliminates the possibility of triggering the threshold element 13 during the discharge of the capacitor 10 and connecting the power transformer 1 to the network through the power key element.

At the moment of removing the clock pulse (, ±), the next cycle of operation of the entire device begins. The threshold element 13, through its potential output 15, supplies the voltage to the generator 17 of control pulses. The generation in it, as in the first cycle, begins at the moment of arrival of the pulse from the driver of 20 pulses (time tg),

Resistor 8. serves to discharge the capacitor 7 after locking the opening thyristor of the auxiliary key element 1ent.

An electronic blocking circuit can also be provided in the device (black is not shown), which excludes the possibility of a lamp flash if the working capacitor charge process is not completed and the power key element is open. The frequency of the flashes of the pump lamp 12 is controlled by restructuring the generator 17 clock pulses.

A smooth adjustment of the energy discharged to the pump lamp is accomplished by changing the level of comparing of the threshold element 13,

The device eliminates the possibility of overloading of the charging valves and the power transformer, since the charge of the working capacitor starts synchronously with the increase of the charging voltage from zero value by the sinusoidal law, which makes it possible to refuse the charging current-limiting elements (resistors) that reduce the K1Sch the entire device.

Claims (1)

Invention Formula A device for feeding pumping lamps of optical quantum generators operating in the mode of both single and frequently repeated flashes with float. pumping energy control, containing a power transformer, an inductance and a power key element connected to its primary winding, a power rectifier connected to the secondary winding of the specified transformer, and is used to charge a working capacitor discharged to the pulse ignition transformer of the lamps, and a threshold element, connected by one input to a working capacitor, characterized in that, in order to increase the reliability of the device, parallel to the primary winding of the power transformer and A chain consisting of a capacitor and connected in series with it and executed on two parallel-connected low-power thyristors of an auxiliary key element, the control input of which is connected to the pulse output of the threshold element, to the potential output of which the control generator is connected to the force key element. pulses, the blocking input of the threshold element is connected to one of the outputs of the clock generator, the second output of which is connected to the pulse Ignition transformer, and the control input of the power key element is connected to the output of the control pulse generator, the triggering input of which is connected to the output of the pulse shaper synchronized with the supply voltage. J T about H.  h ± e I / L / L-do: t / Fig. 2 MI i / 4% L i: 6