Power factor boost converter power supply
AssigneeAstec International Limited
InventorRex W. J. Whittle
Life of this patent
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Abstract
A boost-type power factor correction circuit is disclosed in which output voltage of the convertor is proportional to the peak input voltage. To achieve this, the circuit includes a peak rectifier D2, C2 which senses peak input voltage and provides a reference to which the output voltage derived through resistors R3, R4 is compared to give an error signal dependent upon variation from the peak input voltage derived reference. The error signal is used to control a MOSFET switch 120 to provide an output voltage V.sub.out dependent upon the reference.
Claims11
A boost-type power factor correction circuit having input for receiving an input voltage and an input current, and an output for providing an output voltage, comprising:
- a boost inductor coupled to said input to receive said input voltage and input current,
- an electronic switch controlling the current through the inductor,
- a capacitor coupled to said output, said output voltage being generated across said capacitor,
- rectifier means connecting the inductor to the capacitor such that energy stored in the inductor is transferable to the capacitor,
- means for cyclically switching the electronic switch such that said switch has a controllable duty cycle,
- means for controlling the switch duty cycle to cause the input current of said correction circuit to follow the input voltage applied to said correction circuit and to regulate the output voltage of said correction circuit to be linearly proportional to a peak value of the input voltage, said controlling means comprising means for comparing the output voltage with a variable reference voltage which is proportional to the peak value of the input voltage and for generating an error signal, and means for generating a control signal for the switch in dependence upon the error signal.
A boost-type power factor correction circuit having an input for receiving an input voltage and an input current, and an output for providing an output voltage, comprising:
- a boost inductor coupled to said input to receive said input voltage and input current,
- an electronic switching controlling the current through the inductor,
- a capacitor coupled to said output, said output voltage being generated across said capacitor,
- rectifier means connecting the inductor to the capacitor such that energy stored in the inductor is transferable to the capacitor,
- means for cyclically switching the electronic switch such that said switch has a controllable duty cycle,
- means for controlling the switch duty cycle to cause the input current of said correction circuit to follow the input voltage applied to said correction circuit and to regulate the output voltage of said correction circuit to be proportional to a peak value of the input voltage, said controlling means including means for comparing the output voltage with a variable reference voltage which is proportional to the peak value of the input voltage and for generating an error signal, and means for generating a control signal for the switch in dependence upon the error signal.
Dependencies are inferred from the claim text.