Method and device for obtaining the effective value of AC voltage of pfc power supply
A technology of AC voltage and acquisition method, which is applied in the direction of output power conversion device, high-efficiency power electronic conversion, electrical components, etc., and can solve the problem of large effective value of AC voltage, inability to know the time of inductance current drop, AC voltage estimation error, etc. question
Active Publication Date: 2020-03-06
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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Problems solved by technology
[0005] Because when the power factor correction circuit works in the inductive current discontinuous mode, it is impossible to know the time when the inductive current drops, therefore, the prior art cannot avoid the AC voltage estimation error in the power factor correction circuit current discontinuous working state, which is likely to cause estimation The problem that the effective value of AC voltage is too large
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[0144] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0145] It should be noted that the descriptions involving "first", "second" and so on in the present invention are only for the purpose of description, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical ...
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A method and device for obtaining an effective value of an alternating current voltage of a power factor correction (PFC) power supply. The method for obtaining an effective value of an alternating current voltage of a PFC power supply comprises the following steps: acquiring current operating parameters of a PFC power supply (S100); when the current operating parameters of the PFC power supply meet a condition for a power factor correction circuit of the PFC power supply to be turned off, controlling the power factor correction circuit of the PFC power supply to turn off, and according to the voltage of two ends of an electrolytic capacitor, obtaining a peak value of an input alternating current voltage of the PFC power supply (S200); when the current operating parameters of the PFC power supply meet a condition for the power factor correction circuit of the PFC power supply to be turned on, controlling the power factor correction circuit to turn on, and according to an operating mode of the power factor correction circuit, obtaining an instantaneous value of the input alternating current voltage of the PFC power supply (S300); according to the peak value of the input alternating current voltage or the instantaneous value of the input alternating current voltage, calculating an effective value of the alternating current voltage of the PFC power supply (S400). The method and device have the characteristic of high accuracy.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a method and a device for acquiring an effective value of an AC voltage of a PFC power supply. Background technique [0002] In household appliances and other similar systems: the single-phase AC power from the power grid first undergoes uncontrolled full-bridge rectification, then passes through a power factor correction circuit, and finally outputs DC power to supply power to large-capacity electrolytic capacitors and loads. Wherein, the power factor correction circuit generally adopts the BOOST architecture. The BOOST power factor correction circuit can not only make the power supply circuit achieve a higher power factor, but also boost and output a stable DC bus voltage to provide a stable DC power supply for the load. [0003] There are many control methods for BOOST power factor correction, such as voltage / current double closed-loop control algorithm, single-cycl...
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IPC IPC(8): H02M1/42
CPCH02M1/4208Y02B70/10
Inventor 黄招彬
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD