RU1820984C - Device for pulse regulation of supply for direct-current motor - Google Patents

Abstract

The invention relates to electrical engineering. SUMMARY OF THE INVENTION: a device for switching power supply to a DC motor includes a power thyristor 1, an auxiliary thyristor 2, a switching capacitor 3. a transistor switch 4, a storage choke 5; return diode 6. The load is a motor 7 with a shunt diode 8. When the transistor switch 4 is opened, energy is accumulated by the storage choke 5 and the switching capacitor 3. When the transistor switch 4 is closed, the stored energy is transferred to the switching capacitor 3, which increases the efficiency of the device. 2 ill.

Description

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The invention relates to electrical engineering and can be used in installations and vehicles with electric drive.

Figure 1 shows the electrical circuit diagram of the controller; Fig. 2 is a diagram of voltages and currents flowing in a regulator.

The controller contains a power thyristor 1, an auxiliary thyristor 2, a switching capacitor 3, a transistor switch 4, a storage choke 5. a return diode 6. The load is a motor 7 with a shunt diode 8. The control voltage pulses unlock the thyristor 1, and through the load 7 current flows. At the same time, a series of pulses with a duty cycle of about two and a repetition rate much greater than the operating frequency of the controller are supplied to the base of transistor 4. Transistor 4 periodically opens, and current flows through inductor 5. the charging capacitor 3. During the open state of the transistor, energy is accumulated by the inductor 5 and the capacitor 3, the voltage polarity at the terminals of the throttle corresponds to that indicated in Figs. 1 without brackets. When the transistor 4 is closed; The voltage at the inductor changes sign, the diode 6 opens, and the storage energy is transferred to the capacitor H. Thus, the energy loss at the storage inductor during discharge of the capacitor 3 is reduced and the efficiency of the controller is increased. Throttle inductance is selected based on the maximum permissible collector current of transistor 4 at a given switching frequency.

Besides; the ratio of the inductance of the choke 5 and the capacitance of the capacitor 5 determines the time during which the voltage on the capacitors increases to a maximum value. With pulse-width control, the charge time of the capacitor is selected no more than the minimum open time of the thyristor 1. In this case, interruptions in the operation of the controller are eliminated, its reliability is increased and the control range is expanded.

Claims (1)

SUMMARY OF THE INVENTION A device for impulse control of a dc electric motor throttling, comprising a power thyristor connected in series between the terminals for connecting the DC source and the terminals for connecting the load, shunted backward by a shunt diode, a circuit of serially connected auxiliary thyristor and a switching capacitor connected in parallel with a power thyristor, characterized in that a return diode, a storage choke and a transistor switch are introduced, a storage choke is connected between the common point of the cathode of the auxiliary thyristor and the switching commutator capacitor and a common collector point of the transistor switch and the anode of the return diode, and the cathode of the return diode p connected to a positive terminal for connecting a constant voltage source, and an emitter of a transistor switch is connected to a negative terminal for connecting a constant voltage source.