SU395974A1 - - Google Patents

Description

ONE VIBRATOR ON A TIRISTOR WITH A LOAD IN ANOD'S CHAIN

one

The invention relates to a pulse technique and can be used in automation and remote control devices.

The well-known one-shot on a thyristor with a load in the anode circuit, containing an auxiliary semiconductor key in the thyristor off circuit and the driver time / kick, the capacitor of which is connected between the thyristor anode and the base electrode of the key, has a low efficiency, a narrow control range of the output pulse and long recovery time.

The aim of the invention is to increase efficiency, expand the range of control over the duration of the output impulse and reduce the recovery time of the one-shot. For this, the control transition of the auxiliary semiconductor switch is connected to the mixing source through a successive chain from the time of the setting resistor and the counter-on diode, the midpoint of which is connected to the thyristor cathode.

FIG. 1 shows the basic electrical circuit of the proposed one; in fig. 2 - the same, BapinaiiT, in which the thyristor is used as the key.

The monovibrator contains a thyristor 1, a load 2, a powerful semiconductor

a switch 3 (transistor), a capacitor 4 and a resistor 5, the time of the master circuit, diodes 6 and 7.

In the initial state, the thyristor 1 and the transistor 3 are closed, the capacitor 4 is charged and the circuit does not consume current. Input positive impulse unlocks thyristor. In this case, the front of the output pulse is formed and the negative voltage drop from the anode of the thyristor 1 through the capacitor 4 is transmitted to

The base of the transistor 3 is not supported in the closed state, despite the fact that diode 6 is ready to close the EO source circuit, since the load current 2 flows through the diode 6 in the forward direction.

As the capacitor 4 is discharged through the open thyristor 1 and the resistor 5, the potential of the low capacitor plate 4 becomes less negative. When this potential exceeds the level (the voltage of the bias source), the emitter-base junction of transistor 3 opens, i.e., the diode 6 and the resistor 5 are closed through the base current circuit that unlocks the transistor 3. As a result of this, the circuit - ground, diode 6, the thyristor control junction /, the open transistor 3, the emitter zero pole of the source EQ - current flows to lock the thyristor /. This is followed by the recovery phase of the circuit during which a cut of the output pulse is formed.

and the capacitor 4 is charged through the load 2 and the base-emitter transition of the transistor 3. At the end of the recovery phase, the circuit no longer consumes current, since the circuits of the sources Е ЕОО almost open.

In the variant of the circuit (Fig. 2) of the one-shot, in which low-voltage thyristor 8 is used as the key, Zener diode 9 is installed to reduce the instability of the output pulse duration. The rest of the circuit is similar to the circuit shown in FIG. one.

Subject invention

A single-vibration thyristor with a load in the apode circuit containing an auxiliary semiconductor switch in the thyristor off circuit and a master / C-circuit time, the capacitor of which is connected between the anode of the thioistor and the base electrode of the switch, characterized in that it increases efficiency and dissipates range of adjustment of the duration of the output pulse and reduction of the recovery time, the control transition of the auxiliary semiconductor key is connected to the bias source through a successive circuit ku zadayushego time of a resistor and a diode oppositely inclusion 1nogo, the midpoint of which is connected to the cathode of the thyristor.

Figl.

FIG. I