Control circuit for a dc motor
AssigneeRobert Bosch GmbH
InventorsThomas Mohr, Karl-Heinrich Preis, Wolfgang Schwenk, Robert Kern
Life of this patent
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Abstract
A control circuit for a direct-current motor driven in a clocked manner, includes an electrolytic capacitor connected in parallel and free-wheeling diode. Spurious radiation is reduced, in that a choke is connected between the positive motor supply voltage and the plus terminal of the electrolytic capacitor, and that the free-wheeling diode is disposed with its cathode between the choke and the electrolytic capacitor, and with its anode on the negative side of the d.c. motor.
Claims4
A control circuit arrangement for a direct-current motor, the motor being driven in a clocked manner, comprising:
- an electrolytic capacitor connected in parallel with the motor;
- a choke coupled between a positive motor supply voltage and a plus terminal of the electrolytic capacitor;
- a free-wheeling diode including a cathode and an anode, the cathode being coupled between the choke and the electrolytic capacitor, the anode being coupled to a negative motor supply voltage;
- and
- a polarity reversal protection device;
- wherein the polarity reversal protection device is coupled between the choke and the positive motor supply voltage.
A control circuit arrangement for a direct-current motor, the motor being driven in a clocked manner, comprising:
- an electrolytic capacitor connected in parallel with the motor;
- a choke coupled between a negative motor supply voltage and a minus terminal of the electrolytic capacitor;
- and
- a free-wheeling diode including a cathode and an anode, the anode being coupled between the choke and the electrolytic capacitor, the cathode being coupled to a positive motor supply voltage.
Dependencies are inferred from the claim text.