Circuit arrangement for operating an electric motor

• US 8,749,186 B2
• Filed: 08/06/2010
• Issued: 06/10/2014
• Est. Priority Date: 10/05/2009
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Stubner, Armin, Martin, Norbert
• Primary Examiner(s): GLASS, ERICK DAVID
• Application Number:
  US13/500,375
• Publication Number:
  US 20120256506A1
• Time in Patent Office: 1,404 Days
• Field of Search: 152/501.6, 152/501.7, 318/443, 318/139, 318/DIG.2, 318/437, 318/466
• US Class Current: 318/443
• CPC Class Codes: B60S 1/08 electrically driven conjoint control of windscreen wiper motor and liquid supply of windscreen washer B60S1/482; conjoint control of windscreen wiper motor and means for cleaning parts o parts other than windscreens or front windows B60S1/56, B60S1/58, B60S1/606
• CPC Class Codes: H02K 11/21 Devices for sensing speed or position, or actuated thereby specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14

Abstract

The invention relates to a circuit arrangement for operating an electric motor, in particular an electric motor for a windshield wiper. The electric motor has a first voltage connection, a ground connection, and a return connection. The ground connection is connected to a battery ground connection of a battery. Furthermore, a switch is provided, which is designed to open or disconnect a conductive connection between the ground connection and the return connection depending on an angle position of a shaft driven by the electric motor. Additionally, a filter member is arranged between the return connection and the ground connection.

Claims

1. A circuit arrangement for operating an electric motor, wherein the electric motor has a first voltage connection, a ground connection, and a return line connection, wherein the ground connection is connected to a battery ground connection on a battery, the circuit arrangement comprising:

wherein a switch is provided configured to open or break a conductive connection between the ground connection and the return line connection on the basis of an angular position of a shaft driven by the electric motor, and

a capacitor is arranged directly between the return line connection and the ground connection.

2. The circuit arrangement as claimed in claim 1, wherein the capacitor has a capacitance of between 1 nF and 100 nF.

3. The circuit arrangement as claimed in claim 1, wherein the electric motor includes a rotary motor.

4. The circuit arrangement as claimed in claim 1, wherein the electric motor has a limit stop connection which is connected to a battery voltage contact, wherein the internal switch is designed to connect the return line connection either to the ground connection or to the limit stop connection on the basis of the angular position of the shaft.