Voltage controlled current driver powered by negative voltage rail
First Claim
Patent Images
1. A current drive circuit comprising:
- an input terminal for receiving a positive voltage control signal;
a power input for connection to a negative voltage power supply; and
circuitry configured to supply a controlled current to an attached load from the negative voltage power supply, a magnitude of the controlled current based on the positive voltage control signal, wherein the circuitry includes a feedback amplifier having an output and configured to accept the positive voltage control signal and a second amplifier connected to the output of the feedback amplifier and configured to supply the controlled current to the attached load from the negative voltage power supply.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and current drive circuit is provided that accepts a positive voltage input signal and supplies power to a load from a negative voltage rail.
-
Citations
18 Claims
-
1. A current drive circuit comprising:
-
an input terminal for receiving a positive voltage control signal; a power input for connection to a negative voltage power supply; and circuitry configured to supply a controlled current to an attached load from the negative voltage power supply, a magnitude of the controlled current based on the positive voltage control signal, wherein the circuitry includes a feedback amplifier having an output and configured to accept the positive voltage control signal and a second amplifier connected to the output of the feedback amplifier and configured to supply the controlled current to the attached load from the negative voltage power supply. - View Dependent Claims (2, 3, 4)
-
-
5. A current drive circuit comprising:
-
an input terminal for receiving a positive voltage control signal; a power input for connection to a negative voltage power supply; and circuitry configured to supply a controlled current to an attached load from the negative voltage power supply, a magnitude of the controlled current based on the positive voltage control signal, the circuitry further comprising; a ground reference; a first amplifier having an output, an inverting input and a non-inverting input; a second amplifier having an input connected to the output of the first amplifier and an output adapted to supply the controlled current; a current sense resistor connected between the output of the second amplifier and the attached load; a first resistor connected between the non-inverting input of the first amplifier and the input terminal; a second resistor connected between the non-inverting input of the first amplifier and the output of the second amplifier; a third resistor connected between the inverting input of the first amplifier and the ground reference; and a fourth resistor connected between the inverting input of the first amplifier and the attached load. - View Dependent Claims (6, 7, 8, 9, 10, 11)
-
-
12. A method for supplying current to a load comprising:
-
receiving a positive voltage input signal from a controller; supplying current to the load from a negative voltage power supply where a magnitude of the current is based on a magnitude of the positive voltage input signal, wherein supplying current to the load includes; comparing a voltage drop on a current sense resistor to the positive voltage input signal using a feedback amplifier; supplying a control signal to a second amplifier from an output of the feedback amplifier; and supplying current to the load from the second amplifier based on a magnitude of the control signal. - View Dependent Claims (13, 14, 15)
-
-
16. A system for supplying power to inductive loads comprising:
-
at least one inductive load; at least one negative supply current driver circuit configured to supply current to the inductive load from a negative voltage power supply where a magnitude of the current is selected based on a magnitude of a positive voltage input signal. - View Dependent Claims (17, 18)
-
Specification