H-bridge drive utilizing a pair of high and low side MOSFET's in a common insulation housing
First Claim
1. A method for preventing a shoot through event in a bridge circuit comprising a high side witch and a low side switch connected at an output node, comprising:
- measuring a voltage across said low side switch;
providing a reference voltage;
comparing said reference voltage to said voltage across said low side switch; and
turning on said low side switch when said voltage across said low side switch has reached said reference voltage.
1 Assignment
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Accused Products
Abstract
A fully protected H-bridge for a d-c motor consists of two high side MOSFETs and a control and logic IC on a first conductive heat sink all within a first package and two discrete low side MOSFETs. The entire bridge is controlled by the IC. Shoot thru protection is provided for each leg, and a PMW soft start sequence is provided through the control of the low side MOSFETs, programed by an external, chargeable RC circuit. Input signals to the high side MOSFETs select the operation modes. Protective circuits are provided for short circuit current and over current conditions. Sleep mode and braking/non braking control is also provided.
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Citations
15 Claims
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1. A method for preventing a shoot through event in a bridge circuit comprising a high side witch and a low side switch connected at an output node, comprising:
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measuring a voltage across said low side switch;
providing a reference voltage;
comparing said reference voltage to said voltage across said low side switch; and
turning on said low side switch when said voltage across said low side switch has reached said reference voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A motor controller comprising:
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a low side switch;
a high side switch coupled to said low side switch at an output node; and
an adaptive dead time circuit which turns on said low side switch when a voltage across said low side switch has reached a predetermined level. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification