Abstract: The invention relates to a circuit intended to supply a reference voltage comprising a voltage generator (REF) provided with a supply terminal and an output for supplying a voltage having a given nominal value (V.sub.R) and comprising a differential amplifier (A), fed by a first supply voltage, whose non-inverting input is connected to the output of the voltage generator (REF). An output of the differential amplifier (A) is connected to an input of a follower stage (T) through a controlled switching device (1), the follower stage (T) having its input connected to the first supply voltage through a first resistor (R.sub.1) and having its output, which supplies the said reference voltage (V.sub.D), connected on the one hand to the inverting input of the differential amplifier (A) through a divider bridge and on the other hand to the supply termianl of the voltage generator (REF).

Abstract: A door interlock system and method are disclosed which are suitable for use for permitting electrical energization of power to components within an enclosure (11). If the door is opened, the components are de-energized. The system and method use a supply circuit breaker (5) external of the enclosure (11), and an enclosure circuit breaker (27) within the enclosure. A door sensing circuit (31) comprising an intrinsically safe barrier device senses a door of the enclosure (11) closed by door switch means (33). If the door is opened the door sensing circuit (31) opens a pilot circuit (25) which interrupts pilot circuit current and causes a pilot relay (21) to operate to trip-out the supply circuit breaker (5) thus, de-energizing the enclosure (11).

Abstract: Disclosed is a supply of the AC-DC converter type where the regulation is achieved by successive operations for charging and discharging a capacitor. The supply includes an input oscillator circuit, the period of which is very small as compared with that of the input AC voltage. A first switch is closed during the time necessary for the charging of the capacitor of the oscillator circuit. When it opens, a second switch gets closed to enable the transfer of energy towards the load. The regulation is done by an oscillator circuit which is controlled by an error voltage on the load and which triggers a monostable trigger circuit to close the first switch and open the second one during the period when this monostable trigger circuit is in its quasi-stable state.

Abstract: A detector of the two wire type with regulated voltage is disclosed, comprising a sensor and a switching device.The switching device comprises a series voltage regulation circuit, a parallel voltage regulation circuit and switching circuit. The latter receives the output signal from the sensor for alternately activating the series circuit in a first state of the signal and the parallel circuit in a second state of the signal.

Abstract: A voltage regulator for an aircraft d.c. power supply in which the gain of the voltage regulator varies as a function of d.c. load current and a.c. generator speed. In addition, in a preferred embodiment of the invention, low noise lead compensation is provided by a network which models the system response to changing load currents. It predicts the change in d.c. voltage which would occur in response to load current changes and provides regulator lead compensation.