DRIVE ARRANGEMENT
First Claim
Patent Images
1. A drive arrangement for driving a seat belt pre-tensioner having an electric motor, the arrangement comprising:
- a power supply circuit which is configured to receive power from a power supply providing a positive voltage supply input, the power supply circuit incorporating;
a first pair of switches (S1 and S2) connected with a first output provided therebetween and with the switch (S1) connected with the positive voltage supply input and the switch (S2) connected with the negative voltage supply input.a second pair of switches (S3 and S4) connected with a second output provided therebetween with the switch (S3) connected with the positive voltage supply input and the switch (S4) connected with the negative voltage supply input, the first and second outputs being configured to be connected to the motor in a seat belt pre-tensioner;
a control unit connected to the switches (S1, S2, S3, and S4) to control the switches to output a voltage across the first and second outputs; and
a voltage boost circuit which, upon activation by the control unit, increases the voltage across the outputs.
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Abstract
A drive arrangement (1) for driving a motor (9) in a seat belt pre-tensioner incorporates a power supply circuit (6) in the form of an H bridge and a voltage boost circuit 16 which are controlled by a control unit (17). The control unit (17) controls the voltage boost circuit (16) to increase the voltage output to the motor (9) to speed up the rotation of the motor (9) whilst the motor (9) winds in slack in a seat belt (13).
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Citations
15 Claims
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1. A drive arrangement for driving a seat belt pre-tensioner having an electric motor, the arrangement comprising:
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a power supply circuit which is configured to receive power from a power supply providing a positive voltage supply input, the power supply circuit incorporating; a first pair of switches (S1 and S2) connected with a first output provided therebetween and with the switch (S1) connected with the positive voltage supply input and the switch (S2) connected with the negative voltage supply input. a second pair of switches (S3 and S4) connected with a second output provided therebetween with the switch (S3) connected with the positive voltage supply input and the switch (S4) connected with the negative voltage supply input, the first and second outputs being configured to be connected to the motor in a seat belt pre-tensioner; a control unit connected to the switches (S1, S2, S3, and S4) to control the switches to output a voltage across the first and second outputs; and a voltage boost circuit which, upon activation by the control unit, increases the voltage across the outputs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification