SU1707742A1 - Device for forming current pulses - Google Patents

Abstract

The invention relates to a converter technique, in particular to devices for generating current pulses, and can be used in current pulse generation systems in active-inductive load. The purpose of the invention is to increase the efficiency by providing energy recovery and reliability by eliminating overvoltages on the elements of the unmanaged rectifier. Energy recovery to the capacitive storage device 8 is carried out by means of a recovery unit 7, wherein the voltage limiter 6 provides protection against overvoltages of the elements of the unregulated rectifier 4, limiting the charging current rate of the protective reactor 5. 1 Il.

Description

The invention relates to a conversion technique, in particular to devices for generating current pulses, and can be used in systems for generating current pulses in an active inductive load.

The purpose of the invention is to increase efficiency by providing energy recovery and reliability by eliminating overvoltages on the elements of an uncontrolled rectifier.

The drawing shows a schematic diagram of a device.

A device for generating current pulses comprises a constant voltage source 1, a series resonant voltage inverter 2, a transformer 3, an uncontrolled rectifier 4, a protective reactor 5, a voltage limiter 6, a recovery unit 7, a capacitive storage 8. a thyristor 9 of a discharge key, an active inductive load 10 , in the recovery unit 7, the reactor 11 and the thyristor 12.

The power terminals of the series resonant inverter 2 are connected to the terminals of the DC voltage source 1, the primary winding of the transformer 3 is connected in series with the oscillating circuit of the series resonant voltage inverter 2, the secondary of the transformer 2 is connected to the inputs of an uncontrolled rectifier 4. whose first output is connected to the first terminals of the capacitive drive 8 and the active inductive load 10 and the anode of the thyristor 12 of the recovery unit 7, the anode of the thyristor 9 discharge key and connected to the second output of the capacitive storage 8. through the reactor 11 with the cathode of the thyristor 12 and through a parallel connected protective reactor 5 and a voltage limiter b with the second output of the uncontrolled rectifier 4, the control electrodes of the thyristors 9 and 12 are connected to the corresponding terminals for supplying control signals.

The device operates as follows.

At the initial time, the resonant inverter 2 is turned on to charge a discharged capacitive storage 8. In this case, the voltage limiter 6 limits the voltage at the protective reactor 5.

Subsequently, the voltage at the protective reactor 5 is determined by the voltage drop across the ohmic resistance of the reactor and the voltage drop caused by higher harmonics of the rectified current. When the voltage across the capacitive pump 8 reaches a predetermined value, the charge ceases. The charge can be controlled, for example, by turning off the resonant inverter 2. When a signal is received to form a current pulse, the thyristor 9 of the bit switch is turned on and the capacitive storage 8 is discharged to load 10, forming a sinusoidal current pulse. In the process of forming a current pulse, the voltage at the capacitive storage 8 changes sign. It is applied in the forward direction to the valves of the uncontrolled rectifier 4, so they turn on. The protective reactor 5 limits the current. flowing through the keys of an uncontrolled rectifier 4.

The resistance value of the voltage limiter 6 is greater than the inductive resistance of the protective reactor 5, and it does not affect the processes in the circuit. When the load current 10 decreases to zero, the thyristor 9 closes. The formation of the current pulse is completed. For energy recovery, a pulse is supplied to the thyristor 12 non-control electrode 12 of the recovery unit 7. The resonant recharging of the capacitive storage 8 through the gearbox of the recovery unit 7 begins. When the resonant inverter 2 is turned on to charge the capacitive storage 8, the processes in the circuit are repeated, but the voltage on the private keys of the uncontrolled rectifier 4 does not reach practical values

Claims (1)

Claim A device for generating current pulses containing a series resonant voltage inverter, in the circuit of the oscillatory circuit of which the primary winding of the transformer is sequentially connected, the terminals of the secondary winding of which are connected to the corresponding inputs of an uncontrolled rectifier, the first output of which is connected to the first output of the capacitive storage and the first output of the active-inductive load, the second terminal of which is connected to the cathode of the thyristor of the discharge key, the anode of which is connected to the second terminal of the capacitor Accumulator. the control electrode of the thyristor of the discharge key is connected to the first terminal for supplying control signals, the power terminals of the series resonant voltage inverter are connected to the corresponding terminals of the constant voltage source, which is different. what. in order to increase efficiency by ensuring energy recovery and reliability by eliminating overvoltages on the elements of an uncontrolled rectifier. enter into the device5 the thyristor and the recovery unit reactor and the protective reactor shunted by the voltage limiter, the second output of an uncontrolled rectifier through the protective reactor is connected to the thyristor anode of the discharge switch and the first output of the reactor a recovery unit, the second terminal of which is connected to the cathode of the thyristor of the recovery unit. the control electrode of which is connected to the second terminal for supplying control signals, the anode is connected to the first output of an uncontrolled rectifier.