SU978289A2 - Square-wave pulse shaper - Google Patents

Description

() RECTANGULAR FORMER

The invention relates to converter technology and can be used in high voltage pulsed power supply systems for loads in which short circuits can occur.

According to the main author. St. W 736288 is a known rectangular pulse shaper comprising a series circuit formed of a controllable valve switch shunted by a switching unit, a controllable valve shunted by a circuit from a current source and throttle, a load, a short circuit sensor, and a power source with an output capacitor. , and parallel to the load, the key on the controlled valve is turned on.

Thanks to this circuit solution, it is possible to form a sufficiently steep forefront of the pulse on the load, fix with sufficient accuracy the moment of the end of the pulse to protect the load, limit the energy released in it during short circuits, and also provide conditions for turning off the controlled valve switch with 5 failure Cl 1 node.

However, during the formation of the front edge, shock excitation of oscillatory circuits composed of parasitic elements occurs.

10 / "circuits (inductors of wires and capacitors of the equipment of the former). These oscillations cause overvoltages in the circuit, for example, the voltage applied to the load and, accordingly, to the key shunting it, can be more than twice the set value. This reduces the reliability of the driver.

The aim of the invention is to increase the reliability of the former.

Claims (1)

The goal is achieved by the fact that a damping unit and a resistor are inserted in the device, the damping unit is made on an uncontrolled valve and a capacitor and connected parallel to the load, and the capacitor is connected to the power supply capacitor by an order of magnitude higher than the wave resistor. from the resistance of the oscillating circuit formed by the capacitor of the power supply and the choke, a circuit that shunts a controlled valve. The drawing shows the diagram of the applied shaper. The driver contains an Ipitan source, a smoothing choke 2, a capacitor 3, a controlled valve switch with a switching unit, a controlled valve 6 connected in the locking direction relative to the load current and a shunt circuit from the source 7 of the reference current and village 6, a valve switch 9 switched on parallel to the load 10, the II-control systems, the short-circuit sensor 12, the voltage key voltage sensor 13, the responsive member 14, the damping unit 15. The shaper works as follows. Before forming the pulse, the required voltage level of the pulse is established using the source 1, the capacitor of the damping unit 15 is charged to the voltage of the power supply capacitor 3, and in the circuit consisting of the power supply 7. the throttle 8, valve 6 is set a current somewhat greater than the maximum allowable load current. Then, the control system 11 generates a control signal to the key, and a voltage pulse is generated on the load, the amplitude of which, due to the introduction of the damping unit, cannot significantly justify the voltage on the capacitor 3 of the power supply. Due to the choice of resistor size, by an order of magnitude higher than the wave. the resistance of the indicated oscillatory circuit, the damping valve is practically not affected, the process of switching off the controlled valve switch when the switching unit fails. On the other hand, the output voltage of the driver is limited and almost non-conducting the voltage of the power supply capacitor. Thus, the introduction of the damping unit favorably distinguishes this shaper from the known one, t vol. on the one hand, it improves the reliability of the driver by limiting the voltage at the driver's output at the voltage level of the power source, and on the other hand, by choosing the above value of the damping unit resistor, the damping unit does not affect the switching off process of the controlled valve key in case of failure of the switching unit. Formula of the invention. Shaper of rectangular pulses according to ed. St. 736288, differing in the fact that, in order to increase reliability, it is equipped with a damping unit and a resistor, the damping unit is made on an unmanaged valve and a capacitor and connected in parallel with the load, and the capacitor is connected to the power supply capacitor through a resistor a resistor by an order of magnitude higher than the wave resistance of the oscillating circuit formed by the capacitor of the power source and the choke of the circuit that shunts the controlled valve. Sources of information taken into account in the examination of 1, USSR Author's Certificate No. 736288, class, N 02 P 13/16, 1977. / about fff 3 S // xff kj  /