CN206422703U

CN206422703U - A kind of single-phase AC DC converters corrected based on high power factor

Info

Publication number: CN206422703U
Application number: CN201720151421.3U
Authority: CN
Inventors: 董理; 陈晓红
Original assignee: SICHUAN HONGCHUANG ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: SICHUAN HONGCHUANG ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2017-02-20
Filing date: 2017-02-20
Publication date: 2017-08-18
Anticipated expiration: 2027-02-20

Abstract

The utility model is related to a kind of single-phase AC DC converters corrected based on high power factor, including ac input end AC, the input rectifying filter circuit being made up of rectifier bridge, input filter circuit Cin being connected with ac input end, the active pfc circuit being connected with input rectifying filter circuit, the switch transformed circuit being made up of power switch pipe and resistance RSENSE being connected with the active pfc circuit, with switch transformed circuit by output rectification circuit DBOOST, output filter circuit the CBULK output rectifier and filter constituted and DC output end VOUT；The active pfc circuit includes PFC control chips, current sampling circuit, the voltage sample circuit being connected with PFC control chips, PFC control chips carry out phase compensation according to the phase difference of current sampling circuit, the voltage that voltage sample circuit is obtained, current signal.

Description

A kind of Single-phase AC-DC converters corrected based on high power factor

Technical field

The utility model is related to AC DC electric conversion field, more particularly to a kind of list corrected based on high power factor Phase AC-DC converter.

Background technology

Active PFC abbreviation PFC, is generally used in the switch power supply equipment with nonlinear load end, due to such Most of loads are nonlinear load in Switching Power Supply, that is, load inside and there is substantial amounts of nonlinear device, these non-linear devices Part can cause there is phase difference between the ac voltage signal and ac current signal of input, cause energy utilization rate very low, Switching Power Supply in such as Switching Power Supply of the most daylight lamp apparatus of routine use, various military, consumer electronic devices etc., it is such All one-level power factor correction circuit should be increased in its Switching Power Supply front end in theory in equipment, for improving utilization of power Rate.There is no the power supply of pfc circuit, general such power input uses diode rectification capacitor filtering, this circuit There is individual shortcoming, just there can only be input current near crest and trough using alternating current crest and the energy near trough, other Period is all no input current, and such power supply is very low to energy utilization rate.

On electrical source power factor correction, the most technology of application is passive PFC, passive PFC one on the market at present As using inductance/capacitance compensation method reduce between the exchange fundamental current of input and voltage phase difference improve power because Number, this PFC mode can only achieve 0.7~0.8, and it has individual typically near high-voltage filtering capacitor/inductance Premise must exactly estimate load characteristic in advance, and load end is very big in perception passive PFC circuit difference corresponding with capacitive, from This point can be seen that passive PFC application compatibility is very poor, require high to user's professional knowledge, and usually require series connection or simultaneously Join many inductance, electric capacity, so directly result in that volume is big, weight big, energy conversion efficiency is not high, is also easy to produce power frequency vibrations And the problems such as noise.

Utility model content

The purpose of this utility model is：The power factor obtained for the existing Active PFC mode of Switching Power Supply Low technical problem is there is provided a kind of Single-phase AC-DC converters corrected based on high power factor, and this application can provide higher Power factor (PF), to the high conversion efficiency of power supply.

The technical solution adopted in the utility model is as follows：

A kind of Single-phase AC-DC converters corrected based on high power factor, including ac input end AC, with ac input end The input rectifying filter circuit being made up of rectifier bridge, input filter circuit Cin of connection, is connected with input rectifying filter circuit Active pfc circuit, the switch change-over being made up of power switch pipe and resistance RSENSE being connected with the active pfc circuit Circuit, the output rectification filter being made up of output rectification circuit DBOOST, output filter circuit CBULK with switch transformed circuit Circuit and DC output end VOUT；The active pfc circuit includes PFC control chips, the electricity being connected with PFC control chips Flow sample circuit, voltage sample circuit, voltage, electricity that PFC control chips are obtained according to current sampling circuit, voltage sample circuit The phase difference for flowing signal carries out phase compensation.PFC control chips and the current sampling circuit of periphery, voltage sample circuit are actively Electric current, voltage signal phase difference are obtained, phase compensation internally is carried out to its curtage signal, its phase difference is leveled off to 0, then the power switch pipe progress switch motion in regulation output pulse driven switch translation circuit, realizes Power convert.

In such scheme, the PFC control chips model NCP1606, the current sampling circuit becomes comprising LBOOST Depressor, the voltage sample circuit includes feedback divider resistance ROUT1, ROUT2 of series connection；In the current sampling circuit LBOOST transformers time side is connected to the ZCD pins of NCP1606 chips to obtain the alternating current of input by current-limiting resistance RZCD Flow feedback divider resistance ROUT1, the ROUT2 connected in signal, the voltage sample circuit and be connected in DC output end in parallel, instead Feedback divider resistance ROUT1 and ROUT2 tie point are connected to the FB pins of NCP1606 chips to feed back acquirement voltage signal； NCP1606 chips are compensated according to the voltage of acquisition, the phase difference of current signal, then control the output pulse of DRV pins to drive Power switch pipe in dynamic switch transformed circuit carries out switch motion.

In such scheme, EMI EMI FILTERs are additionally provided between ac input end and input rectifying filter circuit.

To sum up, by adopting the above-described technical solution, the beneficial effects of the utility model are：

The utility model is led by adding PFC control chips and peripheral current sampling circuit, voltage sample circuit It is dynamic to obtain electric current, voltage signal phase difference, phase compensation internally is carried out to its curtage signal, makes its phase difference convergence In 0, then the power switch pipe progress switch motion in regulation output pulse driven switch translation circuit, realizes Power convert. The design belongs to closed loop adjustment compared to conventional power factor correction mode, and phase difference can be substantially equal to 0, and power factor (PF) is up to 0.9.And conventional power factor correction mode is compared in this design, it is to avoid volume caused by introducing substantial amounts of electric capacity and inductance, again Amount problem, while the design compatibility is high, correspondingly introduces electric capacity without the inductive or capacitive character that consider to load and inductance enters Line phase is compensated, and the advantages such as power frequency vibrations and noise is not likely to produce, with preferable social effect and market prospects.

Brief description of the drawings

Fig. 1 is circuit theory diagrams of the present utility model；

Fig. 2 is the alternating voltage current signal schematic diagram of distortion；

Fig. 3 is alternating voltage current signal schematic diagram after the utility model Active PFC.

Embodiment

In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain this Utility model, is not used to limit the utility model.

As illustrated, a kind of Single-phase AC-DC converters corrected based on high power factor, including ac input end AC, with The input rectifying filter circuit being made up of rectifier bridge, input filter circuit Cin of ac input end connection, is filtered with input rectifying The active pfc circuit of circuit connection, what is be connected with the active pfc circuit is made up of power switch pipe and resistance RSENSE Switch transformed circuit, with switch transformed circuit by output rectification circuit DBOOST, output filter circuit CBULK constitute it is defeated Go out current rectifying and wave filtering circuit and DC output end VOUT；The active pfc circuit includes PFC control chips, and core is controlled with PFC Current sampling circuit, the voltage sample circuit of piece connection, PFC control chips are obtained according to current sampling circuit, voltage sample circuit Voltage, the phase difference of current signal taken carries out phase compensation.PFC control chips and the current sampling circuit of periphery, voltage Sample circuit active obtaining electric current, voltage signal phase difference, internally carry out phase compensation to its curtage signal, make it Phase difference levels off to 0, and then the power switch pipe in regulation output pulse driven switch translation circuit carries out switch motion, realizes Power convert.

Preferably, the PFC control chips model NCP1606, the current sampling circuit includes LBOOST transformers, The voltage sample circuit includes feedback divider resistance ROUT1, ROUT2 of series connection；LBOOST becomes in the current sampling circuit Depressor time side is connected to the ZCD pins of NCP1606 chips to obtain the ac current signal of input, institute by current-limiting resistance RZCD State feedback divider resistance ROUT1, the ROUT2 connected in voltage sample circuit and be connected in DC output end, feedback partial pressure electricity in parallel Resistance ROUT1 and ROUT2 tie point is connected to the FB pins of NCP1606 chips to feed back acquirement voltage signal；NCP1606 chips Compensated according to the phase difference of the voltage of acquisition, current signal, then control DRV pins output pulse driven switch conversion electricity Power switch pipe in road carries out switch motion.

Preferably, EMI EMI FILTERs are additionally provided between ac input end and input rectifying filter circuit.

Preferred embodiment of the present utility model is these are only, it is all in this practicality not to limit the utility model Any modifications, equivalent substitutions and improvements made within new spirit and principle etc., should be included in guarantor of the present utility model Within the scope of shield.

Claims

1. a kind of Single-phase AC-DC converters corrected based on high power factor, it is characterised in that including ac input end AC, with Ac input end connection by rectifier bridge, input filter circuit C_inThe input rectifying filter circuit of composition, is filtered with input rectifying Circuit connection active pfc circuit, be connected with the active pfc circuit by power switch pipe and resistance R_SENSEConstitute Switch transformed circuit, with switch transformed circuit by output rectification circuit D_BOOST, output filter circuit C_BULKThe output of composition is whole Flow filter circuit and DC output end V_OUT；The active pfc circuit includes PFC control chips, connects with PFC control chips Current sampling circuit, the voltage sample circuit connect, PFC control chips are obtained according to current sampling circuit, voltage sample circuit Voltage, the phase difference of current signal carry out phase compensation.

2. a kind of Single-phase AC-DC converters corrected based on high power factor as claimed in claim 1, it is characterised in that institute PFC control chip model NCP1606 are stated, the current sampling circuit includes LBOOST transformers, the voltage sample circuit Feedback divider resistance R comprising series connection_OUT1、R_OUT2；LBOOST transformers time side passes through current-limiting resistance in the current sampling circuit R_ZCDIt is connected to the ZCD pins of NCP1606 chips and is connected with obtaining in the ac current signal of input, the voltage sample circuit Feedback divider resistance R_OUT1、R_OUT2It is connected in DC output end, feedback divider resistance R in parallel_OUT1With R_OUT2Tie point connection To the FB pins of NCP1606 chips to feed back acquirement voltage signal；NCP1606 chips are according to the voltage of acquisition, current signal Phase difference is compensated, and then controls the power switch pipe in DRV pins output pulse driven switch translation circuit to be switched Action.

3. a kind of Single-phase AC-DC converters corrected based on high power factor as claimed in claim 1, it is characterised in that EMI EMI FILTERs are additionally provided between ac input end and input rectifying filter circuit.