Control device for a switching device with separate start-up and holding coils
View Patent ↗A control device for a switching device with separate start-up and holding coils includes control electronics to control the current supply to the start-up and holding coils and a direct voltage supply unit for the holding coil and the control electronics with the same reference potential for the holding coil and the control electronics.
1. A control device for a switching device, the control device comprising:
a rectifier configured to generate a rectified output voltage from an alternating voltage;
a direct voltage converter configured to receive the rectified output voltage and to generate therefrom a specified direct voltage;
a direct voltage supply unit, configured to receive the specified direct voltage and to generate a first direct voltage and a second direct voltage, wherein the first direct voltage and the second direct voltage are of different magnitudes;
control electronics configured to receive the second direct voltage and to generate control signals for a first switching element and for a second switching element;
a holding coil connected to the first switching element and configured to receive the first direct voltage generated by the direct voltage supply unit; and
a start-up coil connected to the second switching element and configured to receive the rectified output voltage generated by the rectifier.
2. The control device of claim 1 , wherein the control electronics are configured to supply, during a holding process of the switching device, a control signal to the first switching element that generates a constant direct current flow in the holding coil.
3. The control device of claim 1 , wherein the control electronics are configured to supply, during a start-up process of the switching device, a control signal to the second switching element that generates a current flow in the start-up coil.
4. The control device of claim 1 , wherein the control electronics are configured to supply, during a shut off process of the switching device, a control signal to the first switching element that prevents current flow in the holding coil.
5. The control device of claim 4 , wherein the control electronics comprise a quick shut-off unit configured to supply the control signal to the first switching element that prevents current flow in the holding coil.
6. A switching device, comprising:
a contact module; and
the control device of claim 1 ,
wherein the contact module includes the holding coil and the start-up coil.
7. The control device of claim 6 , wherein the control electronics of the control device include a microprocessor or microcontroller configured by a program stored in a memory to provide, during a start-up process of the contact module, the second switching element with a pulse width modulated voltage causing a resulting current in the start-up coil, and to provide, during a holding process of the contact module, the first switching element with a voltage causing a constant direct current to flow in the holding coil.
8. A contactor, comprising:
a contact module: and
the control device of claim 1 ,
wherein the contact module includes the holding coil and the start-up coil.
9. The control device of claim 1 , wherein at least one of the first switching element and the second switching element is a field-effect transistor.
10. The control device of claim 1 , wherein the control electronics are configured to provide, during a start-up process of the switching device, the second switching element with a pulse width modulated voltage causing a resulting current in the start-up coil.
11. The control device of claim 10 , wherein resulting current in the start-up coil causes switching contacts of a contactor to move one of from an open position to a closed position or from a closed position to an open position.
12. The control device of claim 1 , wherein the control electronics are configured to provide, during a holding process of the switching device, the first switching element with a voltage causing a constant direct current to flow in the holding coil.
13. The control device of claim 12 , wherein the constant direct current in the holding coil causes contacts of a contactor to remain in one of an open position or a closed position.
14. The control device of claim 1 , wherein at least one of the first switching element and the second switching element is connected to a reference voltage source.
15. A switching device, comprising:
a contact module including a holding coil and a separate start-up coil; and
a control device comprising:
a rectifier configured to generate a rectified output voltage from an alternating voltage;
a direct voltage converter configured to receive the rectified output voltage and to generate therefrom a specified direct voltage;
a direct voltage supply unit, configured to receive the specified direct voltage and to generate a first direct voltage and a second direct voltage, wherein the first direct voltage and the second direct voltage are of different magnitudes; and
control electronics configured to receive the second direct voltage and to generate control signals for a first switching element and for a second switching element;
wherein the holding coil is connected to the first switching element and configured to receive the first direct voltage generated by the direct voltage supply unit,
wherein the start-up coil is connected to the second switching element and configured to receive the rectified output voltage generated by the rectifier, and
wherein the control electronics of the control device include a microprocessor or microcontroller configured by a program stored in a memory to provide, during a start-up process of the contact module, the second switching element with a pulse width modulated voltage causing a resulting current in the start-up coil, and to provide, during a holding process of the contact mod We, the first switching element with a voltage causing a constant direct current to flow in the holding coil.