SU1511743A1 - Device for controlling electromagnet current - Google Patents

Abstract

The invention relates to power sources and can be used to regulate the current in the windings of a vehicle suspension electromagnet. The purpose of the invention is to reduce weight and loss. The goal is achieved by inserting a third switch 8 in the circuit, connected between the anode of the second switch 7 and the cathode of diode 2. A capacitor 6 is connected between the cathodes of diodes 2 and 3, and the first switch is connected between the anodes of diodes 2 and 3. It does not reduce the switching frequency of the keys, which reduces the overall energy consumption and thereby reduces energy consumption and, consequently, the mass of batteries. 1 il.

Description

4 SAE

315

The invention relates to devices capable of maintaining a given current value of consumers when powered from a constant voltage source, and can be used to regulate the current in the windings of the suspension electromagnets and the direction of vehicles.

The aim of the invention is to reduce mass and loss.

The drawing shows a diagram of the device.

The current control device comprises an electromagnet I, the first and second diodes 2, 3, the first semiconductor switch 4, for example, a controlled thyristor or transistor, a power supply 5, a capacitor 6, the second and third semiconductor switches on thyristors 7, 8.

The electromagnet 1 is connected to the anode of the first diode 2 and the cathode of the second diode 3, Semiconductor switch 4 is connected in the conductive direction between the anode of the first diode 2 and the negative terminal of the power supply 5. The capacitor 6 is connected to the cathode of the first 2 and second 3 diodes, respectively. The thyristor 7 is connected in the forward direction between the positive terminal of the power source 5 and the cathode of the second diode 3, the thyristor 8 anode is connected to the cathode of the first diode, and the cathode is connected to the positive terminal of the power source 5,

The device works as follows.

Suppose key 4 is open

Switching loss when using thyristor 7, Current flows from the source of semiconductor thyristor

NICK 5 power supply via electromagnet 1 and the indicated elements. The current in the electromagnet increases,

After locking key 4, depending | Most of the suspension system’s condition (wired gap clearance, speed and acceleration of the electromagnet in the vertical plane), active or passive current paths can be formed,

In the first case (active loop), the current flows through the power source, which helps to reduce it at high speed, the electromagnet current closes through the first diode 2 and capacitor 6, Capacitor 6 starts to charge (charge), the Current does not flow through the thyristor 7 and the latter is locked. If the capacitor 6 is charged before the voltage of the source

55

the keys make up 30-50% of the total consumption, therefore, reducing the total switching frequency (compared to the prototype) will significantly reduce the total energy consumption and thereby reduce the energy consumption of batteries used to power the electromagnets when the external power supply is cut off,

Claims (1)

Thus, the technical and economic advantages of the proposed device are the reduction in the mass of power supply devices and energy losses, the claims of the invention A device for controlling the current of an electromagnet, comprising first and second diodes connected to the terminals Q ;about 5 8 7434 After powering the thyristor 8, the current is closed along the circuit: electromagnet 1 — first diode 2 — thyristor 8 — power supply 5 — second diode 3 — electromagnet 1. If capacitor 6 has not yet managed to charge to the power supply voltage , then after several cycles of operation of the semiconductor key, it will be charged, and the processes in the device will be similar to those considered. Since capacitor 6 can be discharged only along the circuit: capacitor 6 is a thyristor - power supply 5 - second diode 3 - capacitor 6, then the voltage across it in the quasi-steady state will be not less than the power supply. Thus, in the pause interval, a reverse voltage will be applied to the electromagnet, which will lead to an intensive decrease in current and return of excess energy to the power source. In the second case (passive circuit), the current in the pause interval flows through the shunt electromagnet semiconductor devices. After locking the key 4, a control signal is applied to thyristor B, the current closes along the circuit: electromagnet 1 - first diode 2 - thyristor 8 - thyristor 7 - electromagnet 1, The choice of operating mode of an electromagnet depends on the specific device in which it is used. On a vehicle with an electromagnetic suspension, the control system maintains the necessary clearance. Switching loss when using 0 five with 0 five the keys make up 30-50% of the total consumption, therefore, reducing the total switching frequency (compared to the prototype) will significantly reduce the total energy consumption and thereby reduce the energy consumption of batteries used to power the electromagnets when the external power supply is cut off, Thus, the technical and economic advantages of the proposed device are the reduction in the mass of power supply devices and energy losses, the claims of the invention A device for controlling the current of an electromagnet, comprising first and second diodes connected to the terminals 5151 I connecting an electromagnet respectively with an anode and a cathode, the anode of the second diode being connected to the negative terminal for connecting the power source, the first and second semiconductor switches, the first semiconductor switch being connected in the conductive direction between the anodes of the first and second diodes, and the capacitor, JQ, that, in order to reduce mass and losses, 43i it has a third semiconductor key, the capacitor is connected between the cathodes of the first and second diodes, the second semiconductor key is connected by an anode to the positive terminal for connecting the power supply, and the cathode is connected to the cathode of the second diode, and the cathode of the first diode is to the anode of the second semiconductor key.