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Fuel Cells

Following-voltage-current-regulator

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Following voltage/current regulator

Details

Inventors: Walker, Charles S.;
Assignee: Honeywell, Inc. (Minneapolis, MN)
Primary Examiner: Wong; Peter S.
Assistant Examiner:
Attorney, Agent or Firm: Whitham; C. Lamont, Whitham; Michael E.

A following voltage/current regulator includes a field effect transistor (FET) (48) connected in series between an unregulated voltage source (44) and a load, such as a motor bridge circuit (50). The conduction of the FET is controlled by a control circuit (56) which measures the input voltage to the FET source, the output voltage from the FET drain and the current drawn by the load. Initially, when power is turned on, the inrush current to the load is limited until a predetermined voltage differential between the input and output voltages is achieved at steady state. Then, the voltage regulator maintains the predetermined voltage differential to provide a well regulated output voltage to the load despite fluctuations in supply voltage. This "following" action limits the heat disipation and protects the FET. Because the voltage regulator uses no inductors or transformers, there are no saturation problems and the circuit may be compactly packaged. No switching spikes are produced to cause video interference, and due to suppression of ripple current by the voltage regulator, there is little conducted electromagnetic interference (EMI).

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a voltage/current regulator for a motor drive circuit that is capable of providing a regulated voltage/current output from a voltage source which is subject of wide steady state and transient fluxuations.
It is a further object of the invention to provide a voltage/current regulator circuit which is capable of controlling the motor starting current, when power is initially applied, to a predetermined value and, when a steady state condition is achieved, to provide a regulated voltage output.
It is an additional object of the invention to have the motor starting current increase as the temperature decreases and decrease as the temperature increases.
It is yet another object of the invention to provide these features with a minimum of heat dissipation.
Another object of this invention is to prevent the large ripple current caused by the motor and motor bridge from being conducted in the +28V d.
c.
power line.
A further object of this invention is to prevent high input voltage transients from appearing on the motor bridge.
Another object of this invention is to reduce the magnitude of source voltage ripple voltage from appearing at the output.
And yet another object of the invention is to accomplish these requirements without transformers or inductors so as to minimize weight and volume.
It is still another, more specific object of the subject invention to provide a voltage/current regulator for a FLIR scanning motor which produces no voltage and/or current spikes to cause video interference.
According to the invention, a following voltage/current regulator is provided which includes a field effect transistor (FET) connected in series between an unregulated voltage source and a load, such as a motor drive circuit.
The conduction of the FET is controlled by a control circuit which measures the +28V input voltage, the output voltage to the motor bridge and the current drawn by the load.
Initially, when power is turned on, the motor starting or inrush current to the load is limited until a predetermined voltage differential between the input and output voltages is achieved at steady state

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