CN208723784U - A kind of pfc converter of constant current output - Google Patents
A kind of pfc converter of constant current output Download PDFInfo
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- CN208723784U CN208723784U CN201820620897.1U CN201820620897U CN208723784U CN 208723784 U CN208723784 U CN 208723784U CN 201820620897 U CN201820620897 U CN 201820620897U CN 208723784 U CN208723784 U CN 208723784U
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- inductance
- capacitor
- filter
- switching tube
- load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The utility model provides a kind of pfc converter of constant current output, including alternating current input power supplying, rectifier circuit, the first inductance, switching tube, freewheeling diode, first capacitor, filter capacitor, filter inductance, the second inductance and load.One end of rectifier circuit output end is connect with first inductance one end.The connection of one end of the other end of first inductance and the drain electrode of switching tube and capacitor.The other end of capacitor and anode, one end of load and one end of filter capacitor of freewheeling diode connect.The other end of load and one end of filter inductance connect.One end connection of the other end, the second inductance of the other end and filter capacitor of filter inductance.The other end of second inductance and cathode, the source electrode of switching tube and the other end of rectifier circuit output end of freewheeling diode connect.The utility model circuit can guarantee constant current output while realizing PFC, be compared to two-level configuration, save converter cost, reduce the volume of converter, improve system effectiveness.
Description
Technical field
The utility model relates to power electronics fields, and in particular to a kind of pfc converter of constant current output.
Background technique
Traditional constant-current source is two-level configuration, is made of input stage and output stage, and prime is circuit of power factor correction, after
Grade circuit guarantees constant current output, and the circuit of this two-level configuration is not only at high cost, and volume is big, and low efficiency, poor reliability.
Utility model content
The purpose of the utility model is to overcome above-mentioned the deficiencies in the prior art, propose a kind of PFC transformation of constant current output
Device.
Alternating current input power supplying V is specifically included in the utility model circuitin, it is rectifier circuit, the first inductance, switching tube, continuous
Flow diode, first capacitor, filter capacitor, filter inductance, the second inductance and load.
The specific connection type of the utility model circuit are as follows: the alternating current input power supplying VinWith the input of rectifier circuit
End connection.One end of rectifier circuit output end is connect with first inductance one end.The other end of first inductance and switching tube
Drain electrode is connected with one end of capacitor.The one of the anode of the other end of capacitor and freewheeling diode, one end of load and filter capacitor
End connection.The other end of load and one end of filter inductance connect.The other end of the other end of filter inductance and filter capacitor,
One end of two inductance connects.The source electrode and rectifier circuit of the cathode of the other end of second inductance and freewheeling diode, switching tube
The other end of output end connects.
Compared with prior art, the utility model circuit has the advantage that are as follows:
Compared to the constant-current source of traditional two-level configuration, the utility model circuit structure is simple, has only used a switching tube,
It is easily controllable, the cost and volume of system are effectively reduced, and high reliablity is in two-level configuration.
Detailed description of the invention
Fig. 1 a, Fig. 1 b are respectively the pfc converter structure chart and control block diagram of a kind of constant current output.
Fig. 2 a~Fig. 2 d is circuit modal graph in input voltage positive-negative half-cycle.
Specific embodiment
Specific implementation for the content and feature that the utility model is further described, below in conjunction with attached drawing to the utility model
Scheme is specifically described.
The Basic Topological and control block diagram of this example are as shown in Figure 1a, a kind of pfc converter of constant current output, special
Sign is to include alternating current input power supplying Vin, rectifier circuit, the first inductance L1, switching tube S, freewheeling diode VD1, first capacitor
C1, filter capacitor Cf, filter inductance Lf, the second inductance L2And load.Alternating current input power supplying VinConnect with the input terminal of rectifier circuit
It connects；One end of rectifier circuit output end and the first inductance L1One end connection；First inductance L1Other end and switching tube S
Drain electrode and capacitor C1One end connection；Capacitor C1The other end and freewheeling diode VD1Anode, load one end and filtered electrical
Hold CfOne end connection；The other end and filter inductance L of loadfOne end connection；Filter inductance LfThe other end and filter capacitor
CfThe other end, the second inductance L2One end connection；Second inductance L2The other end and freewheeling diode VD1Cathode, switching tube
The source electrode of S is connected with the other end of rectifier circuit output end.
For easy analysis, the device in circuit structure is accordingly to be regarded as ideal component.
(1) in the positive half cycle of input voltage, first diode conducting, the driving voltage V of switching tube SgBecome from low level
High level, switching tube S conducting, circuit is as shown in Figure 2 a in the modal graph in this stage, alternating current input power supplying VinTo the first inductance L1
Charging, while first capacitor C1The second inductance L is given by switching tube S2Charging and load supplying.The driving voltage V of switching tube SgFrom
When high level becomes low level, switching tube S shutdown, circuit is as shown in Figure 2 b in the modal graph in this stage, freewheeling diode VD1It leads
It is logical, alternating current input power supplying VinWith the first inductance L1First capacitor C is given together1Charging, the second inductance L2Powering load.
(2) VD in the negative half period of input voltage, rectifier circuit3And VD4Conducting, the driving voltage V of switching tube SgFrom
Low level becomes high level, and switching tube S conducting, circuit is as shown in Figure 2 c in the modal graph in this stage, alternating current input power supplying VinIt gives
First inductance L1Charging, while first capacitor C1The second inductance L is given by switching tube S2Charging and load supplying.The drive of switching tube S
Dynamic voltage VgWhen becoming low level from high level, switching tube S shutdown, circuit is as shown in Figure 2 b in the modal graph in this stage, afterflow
Diode VD1Conducting, AC-input voltage VinWith the first inductance L1First capacitor C is given together1Charging, the second inductance L2To load
Power supply.
(3) in order to reduce the second inductance L2Volume, LC filter circuit is added, filters out high-frequency current ripple to loading
Upper available constant DC current.
(4) relationship of the present embodiment circuit output current and input voltage
By the voltage-second balance principle of inductance, the first inductance L1In switch conduction, both end voltage is Vin, the first inductance L1?
Both end voltage is V when switch OFFC1-Vin, D is duty ratio, it can thus be concluded that formula (1) and (2).
VinD=(VC1-Vin)(1-D) (1)
It is constant by the electric current on filtering back loading, it is believed that the voltage in load is constant for VO, the second inductance L2It is led in switch
Both end voltage is V when logicalC1-VO, the second inductance L2In switch conduction, both end voltage is VO, it can thus be concluded that formula (3)~(5).
VO=IOR (3)
(VC1-VO) D=VO(1-D) (4)
It is by the size of current that formula (2) and (5) can must load
In the case where input voltage and fixed load, the i.e. adjustable output electricity of the adjustment duty ratio D size known to formula (6)
Flow size.
(5) it is used as a kind of application example, such as Fig. 1 b, control circuit uses twin nuclei, the second inductance L2On electric current IL2
As outer ring, the first inductance L1On electric current IL1As inner ring, sample rate current IL2Afterwards, the relatively rear (Ks compared with reference current Iref
For proportionality coefficient), departure is sent into outer ring controller, and the detection signal multiplication of input voltage obtains after obtained signal and rectifier bridge
To the first inductive current reference signal, inner loop control is sent into compared with the first inductive current sampling value (Kf is proportionality coefficient)
Device, compared with carrier signal after, change the duty ratio of PWM wave, realize PFC and constant current output function.
Claims (1)
1. a kind of pfc converter of constant current output, it is characterised in that including alternating current input power supplying (Vin), rectifier circuit, first
Inductance (L1), switching tube (S), freewheeling diode (VD1), first capacitor (C1), filter capacitor (Cf), filter inductance (Lf), second
Inductance (L2) and load；Alternating current input power supplying (the Vin) connect with the input terminal of rectifier circuit；Rectifier circuit output
The one end at end and the first inductance (L1) one end connection；First inductance (L1) other end and switching tube (S) drain electrode and capacitor
(C1) one end connection；Capacitor (C1) the other end and freewheeling diode (VD1) anode, load one end and filter capacitor
(Cf) one end connection；The other end and filter inductance (L of loadf) one end connection；Filter inductance (Lf) the other end and filtering
Capacitor (Cf) the other end, the second inductance (L2) one end connection；Second inductance (L2) the other end and freewheeling diode (VD1)
Cathode, switching tube (S) source electrode connected with the other end of rectifier circuit output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820620897.1U CN208723784U (en) | 2018-04-27 | 2018-04-27 | A kind of pfc converter of constant current output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820620897.1U CN208723784U (en) | 2018-04-27 | 2018-04-27 | A kind of pfc converter of constant current output |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208723784U true CN208723784U (en) | 2019-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820620897.1U Expired - Fee Related CN208723784U (en) | 2018-04-27 | 2018-04-27 | A kind of pfc converter of constant current output |
Country Status (1)
| Country | Link |
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| CN (1) | CN208723784U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667286A (en) * | 2018-04-27 | 2018-10-16 | 华南理工大学 | A kind of pfc converter of constant current output |
-
2018
- 2018-04-27 CN CN201820620897.1U patent/CN208723784U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667286A (en) * | 2018-04-27 | 2018-10-16 | 华南理工大学 | A kind of pfc converter of constant current output |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190409 |
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| CF01 | Termination of patent right due to non-payment of annual fee |