Reverse voltage protection for motor drive
AssigneeWoodward Governor Company
InventorDavid C. Petruska
Life of this patent
Estimating the term…
Abstract
A reverse voltage protector for a motor drive is presented. The circuit is in series with an external electrical power source and the motor drive or electrical motor. The reverse voltage protector comprises a switch having a zener diode to protect the switch from overvoltage and a resistor regulating electrical current flow in the control terminal of the switch.
Claims15
A reverse voltage protector interposed between an electrical power source having a positive terminal and a negative terminal and an electrical motor, the reverse voltage protector comprising an n-channel switch having a gate terminal, a drain terminal, and a source terminal, the gate terminal connected to the positive terminal, the source terminal connected to the electrical motor, the drain terminal connected to the negative terminal, the switch remaining passively open and preventing flow of electrical power when the positive terminal and negative terminal are connected to the motor in reverse, the switch allowing flow of electrical power when the positive terminal and negative terminal are correctly connected to the motor.
A reverse voltage protector interposed between an electrical power source having a positive terminal and a negative terminal and an electrical motor, the reverse voltage protector comprising:
- a p-channel switch having a gate terminal, a drain terminal, and a source terminal, the gate terminal connected to the negative terminal, the source terminal connected to the electrical motor, the drain terminal connected to the positive terminal, the switch remaining passively open and preventing flow of electrical power when the positive terminal and negative terminal are connected to the motor in reverse, the switch allowing flow of electrical power when the positive terminal and negative terminal are correctly connected to the motor;
The reverse voltage protector of claim further comprising:
- a zener diode arranged in parallel with the gate terminal and the source terminal;
- and
- a resistor connected to the gate terminal and the positive terminal.
A reverse voltage protector interposed between an electrical power source having a positive terminal and a negative terminal and an electrical motor, the reverse voltage protector comprising:
- a switch having a control terminal, an input terminal, an output terminal, and a diode between the input terminal and the output terminal, the output terminal connected to the electrical motor, the control terminal connected to one of the positive terminal and the negative terminal and the input terminal connected to an other of the positive terminal and the negative terminal such that the switch turns on when the positive terminal and the negative terminal are correctly connected, the switch remaining passively open when the positive terminal and the negative terminal are connected to the motor in a reverse orientation.
Dependencies are inferred from the claim text.