SU790281A1 - Pulse generator - Google Patents

Description

one

The invention relates to a pulse technique and can be used to produce powerful, stabilized current pulses in a load.

A device for charging a storage capacitor of a pulse generator is known, which contains a transformer, the primary winding of which is connected to a current source, a bridge 10 asymmetric rectifier, two adjacent arms of which are connected, diodes, and the other two thyristors, and the middle output of the secondary winding of the transformer is connected through the current 5, the limiting resistance and the additional diode to the common bus of the device, the a-ends of the secondary winding are connected to the diagonal of the bridge unbalanced rectifier, control unit 20 and a storage capacitor and a thyristor and the secondary winding of the transformer is provided with additional taps symmetrically otnositelno1 its midpoint, rye koto- 25 via additional thyristor devices connected to a common bus

13.

The disadvantage of this device is the lack of stabilization in the ana

yarn on storage capacitor.

A pulse generator is known that contains a storage capacitor and a series-connected unstabilized transmitter, charge choke, two controllable valves and a load, and a resistive voltage divider connected to the comparison circuit is connected to the connection point of the charge droplet and controllable valve, and between A common bus and the specified junction point include an additional capacitor and a third controlled valve, the control electrode of which is connected to the comparison circuit and its cathode to the ketabilisers This rectifier through the fourth controlled valve -.2.

The disadvantage of this device is the complexity of constructing the circuit, the cumbersome design when it comes to obtaining large currents in the load, as well as the need to use special valve control devices to make it possible to adjust the frequency of the pulse pulses.

The aim of the invention is to simplify the pulse generator circuit.

and adjust the pulse frequency.

To achieve this goal, a pulse generator containing a storage capacitor, in parallel with which the discharge circuit and a resistive divider are connected, whose output to the reference unit, connected to the locking circuit, which is connected to the charging circuit of the storage capacitor, are entered into the delay device J and serially connected generator and element, the output of which is connected to the charging circuit, and one of the inputs - to the output of the comparator unit and the input of the delay device whose output is coupled to the discharge circuit storage capacitor.

The drawing shows a circuit diagram of a pulse generator.

The generator contains a charging circuit consisting of a series-connected disconnector 1 of a controlled valve 2, a discharge circuit consisting of a controlled valve 3 and a load 4, a storage capacitor 5 and in parallel a connected resistive divider b, a lock circuit a control valve 7 and a resistor 8, an AND element 9, a master oscillator 10, a comparison unit 11 and a delay device 12.

The generator operates according to the following technological scheme.

The storage capacitor is charged by a charge circuit consisting of a resistor 1 and a gate 2. The valve is controlled by an AND 9 element, to one input of which the master generator 10 is connected, and the second INPUT is connected to the comparison unit 11. In the absence of voltage on the storage capacitor 5, the pulses from the output of the master oscillator 10 through the element 9 and 9 start to start the valve 2 of the charge circuit and open it. There is a charge of storage capacitor 5.. The constant charge time of the accumulator of which capacitor 5 is chosen from the condition T-t-u, where V is the constant of the charge time, T is the pulse period, t is the pulse duration. Upon reaching the storage capacitor 5 of a predetermined voltage, a block {comparison 11 is triggered, as a result of which the valve 7 of the locking circuit opens, and the element 9 stops passing the pulses of the master oscillator 10 to the gate 2 of the charging circuit and then the next closes. The accumulator capacitor 5 charge stops

This is achieved by stabilizing the voltage on the storage capacitor 5.

The start of the valve 3 of the discharge circuit, the signal from the output of the comparator unit 11, goes through the delay device 12. By varying the delay time, the pulse frequency is controlled. After the storage capacitor 5 is discharged through the valve 3 to the load 4, the charge-discharge process is repeated. Change reference

V voltages in the comparison unit can adjust the amplitude of the pulses.

The proposed device allows to obtain stabilized amplitude pulses with adjustable frequency, to simplify the pulse generator circuit, eliminating a bridge rectifier, a charging choke, a controlled thyristor, the dimensions of which, when operated at high voltages and high powers, do not allow to produce small-sized portable pulse generator, to simplify the control circuit of the valves of the charge and discharge circuits, reduce the cost price of the pulse generator,

C in the proposed device, input elements (master oscillator 10, element 9 and delay device 12) can be performed on integrated circuits, which allows to simplify the design, reduce the size and increase the reliability of the pulse generator.

Claims (2)

1. USSR author's certificate number 414730, cl. H 05 K 3/53, 1972. 2. Authors certificate of the USSR 323854, cl. H 03 K 3/53, 1969 (prototype).