Power supply with power factor correction and protection against failures of the power factor correction
AssigneeBull HN Information Systems Italia S.p.A.
InventorDaniele Cozzi
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Abstract
In a power supply with a boost pre-regulator and power factor correction devices the voltage induced in an auxiliary winding magnetically coupled to the inductor of the pre-regulator and rectified by a diode bridge charges an integrating capacitor, shunted by a discharging resistor, to a voltage which compared with predetermined reference voltages allows to detect and to signal anomalous operative conditions, such as overload or unoperativeness of the power factor correction devices for the execution of suitable intervention procedures.
Claims5
Power supply of the "boost" pre-regulation type with power supply factor correction comprising:
- a first rectifying bridge having an input and an output feeding a tank capacitor through an inductor and a first diode series connected to said capacitor, modulation means of the current in said inductor periodically switching on a switch shorting said inductor on the output of said first bridge,
- an auxiliary winding magnetically coupled to said inductor, and
- a second rectifying bridge having inputs coupled to said auxiliary winding and outputs,
- further comprising:
- an integrating capacitor coupled to the outputs of said second bridge and shunted by a discharging resistor, and
- first means coupled to said integrating capacitor for comparing the charge voltage of said integrating capacitor with a first reference voltage and asserting a first signal indicative of the missing operation of said current modulation means when said charge voltage is lower than said first reference voltage.
Dependencies are inferred from the claim text.