The shape of current pulses

 

(57) Abstract:

Usage: in optoelectronic technique for the pumping of semiconductor light sources. The inventive device includes an external power source 1, an external generator allowing pulses 2, two charging element R1, R3, drive C1, the load Rn, transistor matrix NV1, dynistor VT1the resistor R2. 1 Il.

The invention relates to a pulse technique and can be used in optoelectronic technique for the pumping of semiconductor light sources.

A well-known shaper of current pulses using a thyristor as a switching element. Apply thyristors operating in avalanche mode. The disadvantage of this shaper is a great strain his power.

Known shapers of current pulses on a powerful RF transistor, where the transistor is used as a switching element. The disadvantages of the scheme are low switching capacity, a large number of circuit elements, the inability to control the current amplitude.

The present invention is the task of creating driver current pulse with a large switched Velicity the amplitude of the generated current pulses and to reduce the dimensions of the driver.

The problem is solved in that in a well-known shaper of current pulses containing an external power source, one pole of which is connected to a shared bus, and between the other pole and the shared bus is consistently included the first charging element, the drive and the load in parallel, which included the second charging element, the switching device, the generator trigger pulses connected to the common bus, and an output connected to the control electrode of the switching element, introduced the managed switching element and unmanaged switching element, connected in series in the collector circuit.

The drawing shows a circuit diagram of the shaper and pulse current.

The electrical circuit of the driver current pulse contains an external power source (PI) 1, an external generator 2 trigger pulses (GI), dynistor VD1, transistor matrix VT1, the drive C1, the charging element R1,2,3, the charging element Rnloads.

The shape of current pulses includes an external power source 1, an external generator 2 trigger pulses, the first charging element R1, performed on the resistor, the drive C1, performed on the capacitor, the external n estornell matrix VT1, and unmanaged switching element, is made on the dynistor VD1.

The device operates as follows.

With power supply 1 removed the feeding direction through a charging limiting element R1 and the charging element R3 is charging the drive C1 to a voltage supply. Upon receipt of the trigger pulse amplitude 10-20 B on the base output transistor transistor matrix matrix VT1 goes to the open state, then automatically opened dynistor VD1 and closes the circuit of the discharge drive C1 managed switching element, is performed on the transistor matrix VT1, and unmanaged switching element, is made on the dynistor VD1, element load Rn. When the load resistance of about 0.1 Ohm and the storage capacity of 0.1 μf is the amplitude of the current in the discharge circuit reaches 50 And when the pulse duration by 0.5 100-250 NS. Dynistor VD1 of gallium arsenide having a voltage of opening 14 and is included in the collector circuit of the matrix VT1, allows to increase the maximum supply voltage and hence the energy level of the drive C1 for maximum amplitude and pulse of current in the load. Dynistor VD1 also allows smart the current off dynistor.

Using different charging element, it is possible to vary the maximum frequency and the power consumption of the driver. By varying the value of the charge capacity, you can change the duration of the current pulse through the load. The amplitude of the pulse current in the load or the level of light power of the laser or of the luminescence diode connected as a load is adjustable by changing the voltage of the shaper.

Thus, the application of the proposed driver of the current pulses can increase the amplitude of the generated current pulses more than five times and to control the current amplitude.

The shape of current pulses containing the power source, the first pole of which is connected to a shared bus, and between the second pole and the shared bus is consistently included the first charging element, the drive and the second charging element, which is connected in parallel the load switching device, which is connected in parallel the load, the switching device connected between the connection point of the first charging member and the drive and a shared bus, and a control input connected to the generator output trigger pulses, characterized in that the switchboard is managed dial-up element.

 

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