Motor control circuit for brushless washing machine motor

Abstract

The invention relates to a motor control circuit (10) for a brushless washing machine motor (12) having an inverter stage (14) for power control of said brushless motor and for generating A control stage (16) for the control signals of the inverter stage (14). The inverter stages are controlled by the control stage via control lines (46a, 46b, 46c, 48a, 48b, 48c). A protection circuit (50) for switching off the control line is provided. The invention also relates to a washing machine having such a motor control circuit.

Description

technical field

[0001] The invention relates to a motor control circuit for a brushless washing machine motor having an inverter stage for power control of the brushless motor, a control stage for generating control signals for the inverter stage, wherein the inverter The transformer stage is controlled by the control stage via control lines. Furthermore, the present invention relates to a washing machine having such a motor control circuit. Background technique

[0002] In such a motor control circuit, an AC voltage is generated by an inverter stage from the DC voltage of the so-called intermediate circuit by switching the positive potential or the negative potential of the DC voltage alternately to at least two output terminals by means of electronic switches, The brushless motor can be operated with the aid of this alternating voltage. The control signals for the electronic switches are generated by the control stage. An example of such a motor control circuit is shown...

Examples

Embodiment Construction

[0017] exist figure 1 A motor control circuit 10 for a brushless DC motor 12 is schematically shown in the block diagram. The motor control circuit 10 has an inverter stage 14 for power control of a brushless motor 12 with three shunts U, V, W and a control stage 16 for generating control signals for the inverter stage 14 . The motor control circuit 10 has an intermediate circuit with a low-side potential and a high-side potential, between which a DC voltage is applied—the intermediate circuit voltage U zw . In this case, the low-side potential forms the ground potential GND of the motor control circuit, wherein in the exemplary embodiment shown, the high-side potential conducts a positive DC voltage potential +DC relative to the low-side potential. The intermediate circuit voltage U is obtained from the AC mains voltage applied to the terminals L, N via the mains components with the rectifier 18 and the capacitor 20 zw .

[0018] Intermediate circuit voltage U zw It can ...

technical field

[0001] The invention relates to a motor control circuit for a brushless washing machine motor having an inverter stage for power control of the brushless motor, a control stage for generating control signals for the inverter stage, wherein the inverter The transformer stage is controlled by the control stage via control lines. Furthermore, the present invention relates to a washing machine having such a motor control circuit. Background technique

[0002] In such a motor control circuit, an AC voltage is generated by an inverter stage from the DC voltage of the so-called intermediate circuit by switching the positive potential or the negative potential of the DC voltage alternately to at least two output terminals by means of electronic switches, The brushless motor can be operated with the aid of this alternating voltage. The control signals for the electronic switches are generated by the control stage. An example of such a motor control circuit is shown...

Examples

Embodiment Construction

[0017] exist figure 1 A motor control circuit 10 for a brushless DC motor 12 is schematically shown in the block diagram. The motor control circuit 10 has an inverter stage 14 for power control of a brushless motor 12 with three shunts U, V, W and a control stage 16 for generating control signals for the inverter stage 14 . The motor control circuit 10 has an intermediate circuit with a low-side potential and a high-side potential, between which a DC voltage is applied—the intermediate circuit voltage U zw . In this case, the low-side potential forms the ground potential GND of the motor control circuit, wherein in the exemplary embodiment shown, the high-side potential conducts a positive DC voltage potential +DC relative to the low-side potential. The intermediate circuit voltage U is obtained from the AC mains voltage applied to the terminals L, N via the mains components with the rectifier 18 and the capacitor 20 zw .

[0018] Intermediate circuit voltage U zw It can ...

Images