Loading patent…
AssigneeRobert Bosch GmbH
InventorStefan Koch
Estimating the term…
The invention relates to a control circuit for an arrangement having at least two DC motors (10, 12), which can be connected in parallel to a DC voltage system (16, 18), in particular a circuit for controlling at least two motors of a motor vehicle fan. In this case, the DC motors (10, 12) can be connected to the DC voltage system (16, 18), on the one hand, during starting, jointly via in each case one series resistor (22, 24) having a low resistance value and a common semiconductor switching element (26) and, on the other hand, during operation, via separate semiconductor switching elements (32, 34), the series circuit comprising the separate series resistors (22, 24) and the common semiconductor switching element (26) being arranged in parallel with the separate semiconductor switching elements (30, 32) for controlling the motors during operation.
A control circuit for an arrangement having at least two direct current motors that are connectable in parallel to a direct voltage system, in particular for controlling at least two fan motors of a motor vehicle blower, wherein the direct current motors (10, 12) are connectable jointly to the direct voltage system (16, 18) on the one hand upon starting, each via a respective low-resistance protective resistor (22, 24) and one common semiconductor circuit element (26), and on the other, in operation, are connectable via separate semiconductor circuit elements (30, 32), and the series circuit of the separate protective resistors (22, 24) and the common semiconductor circuit element (26) is located parallel to the separate semiconductor circuit elements (30, 32) for controlling the motor in operation, and the at least two direct current motors (10, 12) with different capacities are connectable to the direct voltage system (16, 18) via different-sized protective resistors (22, 24), and the smaller protective resistor is connected in series with the direct current motor having the greater capacity.
A control circuit for an arrangement having at least two direct current motors that are connectable in parallel to a direct voltage system, in particular for controlling at least two fan motors of a motor vehicle blower, wherein the direct current motors (10, 12) are connectable jointly to the direct voltage system (16, 18) on the one hand upon starting, each via a respective low-resistance protective resistor (22, 24) and one common semiconductor circuit element (26), and on the other, in operation, are connectable via separate semiconductor circuit elements (30, 32), and the series circuit of the separate protective resistors (22, 24) and the common semiconductor circuit element (26) is located parallel to the separate semiconductor circuit elements (30, 32) for controlling the motor in operation, and at least individual semiconductor circuit elements (26, 30, 32) are embodied as sense FETs.
A control circuit for an arrangement having at least two direct current motors that are connectable in parallel to a direct voltage system, in particular for controlling at least two fan motors of a motor vehicle blower, wherein the direct current motors (10, 12) are connectable jointly to the direct voltage system (16, 18) on the one hand upon starting, each via a respective low-resistance protective resistor (22, 24) and one common semiconductor circuit element (26), and on the other, in operation, are connectable via separate semiconductor circuit elements (30, 32), and the series circuit of the separate protective resistors (22, 24) and the common semiconductor circuit element (26) is located parallel to the separate semiconductor circuit elements (30, 32) for controlling the motor in operation, wherein the semiconductor circuit elements (26, 30, 32) are controlled by a microcontroller (34), and the microcontroller (34) is supplied not only with the set-point value (36) for controlling the semiconductor circuit elements but also a test signal (38) for the polarization of the connected direct voltage system (16, 18).
Dependencies are inferred from the claim text.