Regulated rectifier d.c. power supply

Details Regulated rectifier d.c. power supply Regulated rectifier d.c. power supply

1987-08-10

1988-12-20

Salce, Patrick R.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323222, 323287, H02M 3156

Patent

active

047928875

ABSTRACT:
A control circuit for controlling a known active harmonic filter operating as a step-up converter in a power supply with sinusoidal network current input and a power factor of almost unity. The step-up converter comprises: a main rectifier, a storage inductance (L.sub.S), a cross-connected high-speed transistor (T.sub.Q), a diode (D1) and a power storage capacitor (C.sub.L). The high-speed transistor (T.sub.Q) is controlled by a first threshold switch (STc) whose input is controlled by a control capacitor (C12) coupled to receive a signal representative of instantaneous rectified d.c. output voltage (U.sub.E), instantaneous power output voltage (U.sub.o) and a signal representative of the charge state of the inductance. The inductance charge signal is obtained from a voltage jump (ringing voltage) between the inductance and the diode (D1) by sensing a flank of an oscillation voltage occurring at the diode by a RC circuit (R8, C10), which triggers a second threshold switch (STa) to control charge reversal and recharge of the capacitor (C12), thus determining the time instants of operation of the first threshold switch to control the cross-connected electronic switch (T.sub.Q) to conduction, and hence re-storing of electrical energy in the inductance.

REFERENCES:
patent: 3585491 (1971-06-01), Peterson
patent: 4712169 (1987-12-01), Albach
"Siemens Components 24", Issue 1, 1986, pp. 9-13, 30.

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