Primary switched-mode power supply unit
AssigneeSiemens Aktiengesellschaft
InventorBernd Segger
Life of this patent
Estimating the term…
Abstract
A primary switched-mode power supply unit having an auxiliary power supply for a control unit controlling a primary power circuit breaker connected in series with a first primary winding and a primary voltage regular connected to the control unit. The auxiliary power supply has a secondary primary winding across which a series circuit of a diode and a capacitor is connected. A current limiting circuit breaker is connected between the auxiliary voltage input of the control unit and a ground, the actuating input of said current limiting circuit breaker being connected to an output of an overcurrent controller.
Claims8
A primary switched-mode power supply unit, comprising:
- an auxiliary supply providing operating voltage to an auxiliary voltage input of a control unit which controls a power circuit breaker connected in series with a first primary winding;
- a primary voltage regulator having an output providing an overvoltage control signal to the control unit, said auxiliary supply having a secondary primary winding across which a series circuit of a diode and a capacitor is connected;
- a primary current controller having an output providing an overcurrent control signal to the control unit;
- and
- a current-limiting circuit breaker connected between said auxiliary voltage input of the control unit and a ground, the closing of said current-limiting circuit breaker being responsive to said output of said primary current controller and the opening of said current-limiting circuit breaker being responsive to said operating voltage reaching a predetermined threshold;
- wherein the current-limiting circuit breaker includes a pnp transistor and an npn transistor, each having a collector connected by a respective collector resistance of the other transistor, and a base-to-emitter resistance connected between each transistor's base to its emitter;
- wherein the auxiliary voltage input of the control unit is connected to the emitter of the pnp transistor, and the emitter of the npn transistor is connected to the ground;
- and
- wherein the collector of the npn transistor comprises an actuating input for closing the current-limiting circuit breaker.
A primary switched-mode power supply unit, comprising:
- a power circuit breaker coupled in series with a first primary winding;
- a control unit for controlling said power circuit breaker;
- an auxiliary power supply for supplying operating voltage to said control unit, said auxiliary power supply comprising a second primary winding across which a series circuit of a diode and a capacitor is coupled;
- a primary voltage regulator having an output coupled to provide an overvoltage control signal to said control unit;
- a primary current controller having an output coupled to provide an overcurrent control signal to said control unit;
- and
- a current-limiting circuit breaker coupled across said auxiliary power supply and having a trip input coupled to the output of said primary current controller for controlling its closing, its opening being controlled by the operating voltage of said auxiliary power supply reaching a predetermined threshold level.
Dependencies are inferred from the claim text.