Power controller with a modular power output

Details Power controller with a modular power output Power controller with a modular power output

1975-09-02

1978-11-14

Schaefer, Robert K.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318677, 318341, 361386, G05F 108

Patent

active

041258002

ABSTRACT:
A power controller having a plurality of power output modules which can be added or removed as desired to change the power output rating. The electrical output of the individual power modules are removably attached to an output combining structure. The electrical connections to the output combining structure also provide mechanical support for the power output modules. The servo controller is constructed so that as additional power modules are added, each provides a predetermined proportion of the output power. That is, each module will add in a linear fashion to the total output capability of the amplifier. Load sharing among the modules is provided. An etched copper resistor having a positive resistance versus temperature characteristic is provided to aid load sharing among the output semiconductors. A feedback signal is derived from the power output modules to protect the servo controller. The protection of the power controller is one function of the feedback signal, in that, it limits the maximum current derivable from the controller under normal conditions. The primary function of the current feedback signal is to provide an error signal which when combined with the input command causes the current output to be properly metered to a load. The feedback signal can be obtained from only one of the output modules since load sharing is provided or can be obtained in several or all of the power output modules as desired. Temperature sensing of a representative module is provided for system protection.

REFERENCES:
patent: 3254302 (1966-05-01), Boykin et al.
patent: 3720900 (1973-03-01), VON Bruning
patent: 3859570 (1975-01-01), Veranth et al.
patent: 3909679 (1975-09-01), Petri
patent: 3942586 (1976-03-01), Fries
King, "Test Report: BGN Systems Model 500D Basic Power Amplifier" Audio 12/75, pp. 76-79.
King, "Power FET's" Audio, 2/75, pp. 42-50.
Millman et al., Integrated Electronics: Analog and Digital Circuits and Systems 1972, pp. 302-303.
GE Transistor Manual 1969, pp. 222-223.
Wachner et al., "FTC Power Ratings: An Optimistic View," Audio 2/75, pp. 22-28.
Tucker, "An Alternative View" Audio 2/75, pp. 30-32.

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