DE2047836A1 - Control device for a battery-operated electric motor - Google Patents

Description

For this application the priority of the corresponding British application no. 46726/69 of September 23, 1969 claimed.

Control device for a battery-operated

Electric motor

The invention relates to devices for controlling battery-operated electric motors, for example in battery-powered vehicles.

In such a device, current is supplied from the battery to the electric motor in pulses which are controlled by a thyristor arrangement, the conductivity of which is regulated by a pulse generator, so that the average power given to the motor by changing the frequency and / or the pulse-to-pulse ratio dee Generator can be changed. In order to be able to switch off the thyristor arrangement at the end of each pulse, a capacitor and thyristor switchover takes place. Here it is essential that the switching capacitor is charged again at least to the battery voltage during the interpulse time and that this charge is used when the thyristor arrangement is next switched off.

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is maintained.

The object of the invention is to provide an arrangement which ensures that the load is held.

According to the invention, in a control device for a battery-powered electric motor, the switching of the Thyristors practically shine during 4er intermediate pulse time applied in order to prevent the voltage when switching the capacitor from practically falling below the Battery voltage is discharging.

Embodiments of the invention are described with the aid of the drawing. In this one is:

Figure 1 is a schematic diagram of the control device for battery-powered electric vehicles and

Figure 2 is a circuit diagram of another battery circuit.

The electric motor driving the vehicle is represented by an armature A lying in series with field F. A diode D1 is connected to this motor, which keeps the current constant during the interpulse period. From one Battery B flows current to the motor via a thyristor arrangement TH1. This arrangement is made possible by pulses at the Terminal 1 made conductive after amplification in transistors 2 and 3. The frequency and the pulse-to-space ratio of the pulses and thus the average conductivity time of the thyristor arrangement TH1 is determined by a Speed control pedal regulated in the vehicle.

At the end of each pulse, the thyristor arrangement is removed from the switching capacitor by applying a reverse voltage G1 is switched off via a thyristor TH2, which is amplified by the transistor 5 from terminal 1 and impulses delivered in phase opposition to these

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is triggered at the thyristor arrangement TH1.

After the thyristor arrangement TH1 has been switched off by the reverse voltage of the capacitor C1, motor current flows from the battery via the capacitor 01 and the thyristor TH2 and charges the capacitor 01 to a voltage that is greater than the battery voltage Vb due to the inductance of the voltage source. The capacitor 01 then begins to discharge via the inductance L1 and a diode D2. If the thyristor TH2 is not left connected to the voltage on the capacitor 01, it drops below the battery voltage Vb. If, however, the thyristor TH2 is continuously ignited during the ( intermediate pulse times, the voltage at point 4- cannot become positive according to the invention and the current in the inductance I / I continues to flow through the diode D2 and the thyristor TH2. The voltage on the capacitor 01 remains on the tfert of the battery voltage Vb and likewise the energy from the voltage source inductance is transferred to the inductance L1, which is then transferred to the capacitor C1 when the thyristor TH1 starts conducting and the thyristor TH2 stops conducting the energy to the capacitor 01 is increased by adding another inductance L2 in the circle next to g of the battery B, as can be seen in Pigur 2.

The thyristors can counteract the gate current in a known manner be protected during an anode reverse voltage by connecting a diode between gate and cathode and a diode and a series resistor is given between gate and anode, the diodes to the thyristor are oppositely polarized. The protective diode arrangement can alternatively be used in the amplifier to control the thyristor aiif-e-venctet v / erdeu.

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Claims (1)

Claims IJ control device for a battery-operated electric motor with a thyristor arrangement for regulating the power supply in pulses from a battery to the motor, characterized in that this thyristor arrangement has a switching device for a capacitor and the thyristor, a pulse generator for controlling the conductivity of the thyristor arrangement through which the Average power at the motor by changing the frequency and / or the pulse and spacing ratio of the pulse output of the pulse generator is changed, and includes means for controlling the switching of the thyristor, in order to keep it ignited during practically the entire interpulse period in order to prevent the voltage from being released at the switching of the capacitor practically discharges below the battery voltage. 2 »Control device according to claim 1, characterized in that that the device for controlling the switching of the thyristor delivers gate control pulses which are in antiphase to those who are used to control the thyristor arrangement, which is the power supply from the battery regulates. 3- Control device according to claim 1 or 2, characterized in that the thyristor arrangement, which regulates the current supply from the battery, is bridged by the series connection of switching the capacitor and switching the thyristor, which is itself through the series connection of an inductance and a diode with sum Reverse polarity thyristor is bridged . 4. Control device according to claim 1, 2 or 3, characterized in that an additional inductance is connected in addition to the battery in the battery circuit. 109830/1 U9 5 control device according to one of the preceding claims, characterized in that at least in the thyristor arrangement that the power supply from the Battery regulates the gate during the anode reverse voltage either on this thyristor arrangement or in one Control amplifier is protected against current flow. 109830/1 149 lee fseit ■ ϊ; ■