Protection circuit for permanent magnet synchronous motor in field weakening operation
First Claim
1. A safety circuit for providing protection against failures that impact safety of an inverter circuit driving a Permanent Magnet Synchronous Motor (PMSM) including high and low side switches connected in a bridge and driven by a gate driver circuit during operation of the PMSM in a field weakening mode, the gate driver circuit including output stages for respectively driving the high and low side switches, the high and low side switches being connected to the motor terminals, the safety circuit comprising:
- a main power supply for supplying a main power supply voltage; and
a back-up power supply for supplying a back-up power supply voltage to the gate driver circuit driving the switches of the bridge of the inverter circuit, the main and back-up power supplies receiving power from a DC Bus,wherein if the main power supply fails to deliver adequate electrical power to the gate driver circuit, the back-up power supply provides power to the gate driver circuit to allow the gate driver circuit to turn ON the low side switches and turn OFF the high side switches to reduce the motor speed.
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Accused Products
Abstract
A safety circuit for providing protection against failures that impact safety of an inverter circuit driving a Permanent Magnet Synchronous Motor (PMSM) including high and low side switches connected in a bridge and driven by a gate driver circuit during operation of the PMSM in a field weakening mode, the gate driver circuit including stages for driving the high and low side switches, the safety circuit comprising a main power supply and a back-up power supply for supplying voltage to the gate driver circuit driving the switches of the bridge of the inverter circuit, wherein if the main power supply fails to deliver adequate power to the gate driver circuit, the back-up power supply provides power to the gate driver circuit to allow the gate driver circuit to turn ON the low side switches and turn OFF the high side switches.
36 Citations
14 Claims
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1. A safety circuit for providing protection against failures that impact safety of an inverter circuit driving a Permanent Magnet Synchronous Motor (PMSM) including high and low side switches connected in a bridge and driven by a gate driver circuit during operation of the PMSM in a field weakening mode, the gate driver circuit including output stages for respectively driving the high and low side switches, the high and low side switches being connected to the motor terminals, the safety circuit comprising:
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a main power supply for supplying a main power supply voltage; and a back-up power supply for supplying a back-up power supply voltage to the gate driver circuit driving the switches of the bridge of the inverter circuit, the main and back-up power supplies receiving power from a DC Bus, wherein if the main power supply fails to deliver adequate electrical power to the gate driver circuit, the back-up power supply provides power to the gate driver circuit to allow the gate driver circuit to turn ON the low side switches and turn OFF the high side switches to reduce the motor speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A gate driver IC for protecting an inverter circuit driving a Permanent Magnet Synchronous Motor during a failure of a main power supply, the circuit comprising:
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a back-up power supply for supplying a back-up power supply voltage; high- and low-side output stage circuits each including an output terminal for providing output signals to respective output pins of the IC; a pulse generator circuit for providing pulses for driving the high- and low-side output stages; and the low-side output stage circuit and pulse generator circuits further comprise an inverter circuit connected to the back-up power supply, wherein if the main power supply fails to deliver adequate electrical power to the gate driver circuit, the back-up power supply provides power to bias the inverter circuits to allow the low-side output stage to turn ON and the high side output stage to turn OFF to reduce the motor speed. - View Dependent Claims (13, 14)
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Specification