CN201345618Y - Single-stage semibridge AD-DC converter - Google Patents
Single-stage semibridge AD-DC converter Download PDFInfo
- Publication number
- CN201345618Y CN201345618Y CNU200920050527XU CN200920050527U CN201345618Y CN 201345618 Y CN201345618 Y CN 201345618Y CN U200920050527X U CNU200920050527X U CN U200920050527XU CN 200920050527 U CN200920050527 U CN 200920050527U CN 201345618 Y CN201345618 Y CN 201345618Y
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- CN
- China
- Prior art keywords
- converter
- diode
- link
- switching tube
- electric capacity
- Prior art date
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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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The utility model discloses a single-stage semibridge AC-DC converter, which comprises an input rectification filtering circuit, a voltage rising and falling PFC link, and a semibridge DC-DC converter link, wherein the semibridge DC-DC converter link is composed of two switch pipes (S1 and S2), two capacitances (C1 and C2), a transformer (T) and two diodes (D1 and D2). The voltage rising and falling PFC link and the semibridge DC-DC converter link share the switch pipe (S1), by controlling the duty ratio of the switch pipe, current of a inductance (L) discontinuously works, thereby realizing automatic power factor correction function, and simultaneously realizing terminal voltage rising or falling of the first capacitance (C1) and the second capacitance (C2), so that voltage stress of the switch pipes is limited in a safe working range; moreover, compared with a two-stage AC-DC converter based on semibridge, the single-stage semibridge AC-DC converter uses less switch pipe, voltage stress of the switch pipe is small, thereby reducing cost and volume of the circuit.
Description
Technical field
The utility model relates to AC-DC converter technical field, is specifically related to a kind of single stage semi-bridge AC-DC converter.
Background technology
The 2 stage converter that the AC-DC converter of extensive use is at present combined by the DC-DC converter link of one-level power factor correction link and one-level band isolating transformer often is as shown in Figure 1 based on the two-stage AC-DC converter of half-bridge converter.In this AC-DC converter, the power factor correction link makes by specific control strategy and the input current sineization improves power factor, reduces harmonic content, control circuit also feeds back output voltage simultaneously, by duty ratio output voltage is carried out initial adjustment.DC-DC converter link is carried out fine tuning to power factor correction link output voltage.Twin-stage AC-DC converter can obtain good electric property, as High Power Factor, good voltage-regulation performance etc.But the parts number of circuit is many, has increased cost and circuit complexity, and the DirectCurrent Voltage Ratio input ac voltage amplitude height of power factor correction link output, makes switching tube S
1, S
2And S
3Bear than higher voltage stress.
The utility model content
The purpose of this utility model is to overcome the problems referred to above that prior art exists, and a kind of single stage semi-bridge AC-DC converter is provided, and reduces the quantity of AC-DC inverter power device, and reduces the voltage stress that switching tube bears.
The utility model proposes a kind of single stage semi-bridge AC-DC converter.Single stage semi-bridge AC-DC converter of the present utility model, be actually with buck PFC link and based on the DC-DC converter link of half-bridge in conjunction with and get.The utility model has following technical scheme to realize:
A kind of single stage semi-bridge AC-DC converter comprises input filter circuit E, rectifier bridge Q, inductance L, first capacitor C
1, second capacitor C
2, the 3rd capacitor C
O, the first switching tube S
1, second switch pipe S
2, the first diode D
O1, the second diode D
O2, and the 3rd diode D; It is characterized in that input filter circuit E and rectifier bridge Q constitute the input rectifying filter circuit; Input filter circuit E, rectifier bridge Q, inductance L, switching tube S
1, diode D and first capacitor C
1, second capacitor C
2Constitute buck PFC link; The first switching tube S
1With second switch pipe S
2, first capacitor C
1, second capacitor C
2, transformer T and the first diode D
O1With the second diode D
O2Constitute half-bridge DC-DC converter link; The shared first switching tube S of described buck PFC link and half-bridge DC-DC converter link
1
In the above-mentioned single stage semi-bridge AC-DC converter, an end of inductance L is connected with the common cathode of the negative electrode of the 3rd diode D, rectifier bridge Q; The other end of inductance L and first capacitor C
1An end, the first switching tube S
1Drain electrode connect; First capacitor C
1The other end and second capacitor C
2An end connect, and then be connected with the different name end of transformer T primary side; Second capacitor C
2The other end be connected with the anode of the 3rd diode D, then with second switch pipe S
2Source electrode connect; The first switching tube S
1Source electrode be connected with the common anode of rectifier bridge Q, and then with second switch pipe S
2The end of the same name of drain electrode, transformer T primary side connect.
Compared with prior art the utlity model has following advantage and effect: the utility model is by the control first switching tube S
1Thereby duty ratio make the discontinuous work of the electric current of inductance L realize the function that automatic power factor is proofreaied and correct, realize first capacitor C simultaneously
1, second capacitor C
2Thereby terminal voltage boost or the voltage stress of step-down limit switch pipe at range of safety operation.By control switch pipe S
1And S
2Duty ratio can realize output voltage V
OModulation.The utility model is realized the input power factor correction, and relatively based on the two-stage AC-DC converter of half-bridge, uses less switching tubes, and the voltage stress that switching tube bears is less, thereby has reduced the cost and the volume of circuit.The utility model is suitable as electrochemical power sources such as electrolysis, plating.
Description of drawings
Fig. 1 is existing two-stage AC-DC converter based on the LLC series resonance
Fig. 2 is the forming circuit example of single stage semi-bridge AC-DC converter in the utility model execution mode;
Fig. 3 a~Fig. 3 e is the process chart of an interior different phase of switch periods in the utility model execution mode;
Fig. 4 is the work wave in a switch periods in the utility model execution mode;
Fig. 5 is the main waveform under the power frequency pattern in the utility model execution mode.
Embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present utility model is further described.
With reference to figure 2, single stage semi-bridge AC-DC converter comprises:
Input filter circuit E, rectifier bridge Q, inductance L, capacitor C
1, C
2And C
O, two switching tube S
1And S
2, diode D, D
O1And D
O2
Input filter circuit E and rectifier bridge Q constitute the input rectifying filter circuit;
Input filter circuit E, rectifier bridge Q, inductance L, switching tube S
1, diode D and capacitor C
1, C
2Constitute buck PFC link;
Switching tube S
1And S
2, capacitor C
1And C
2, transformer T and diode D
O1And D
O2Constitute half-bridge DC-DC converter link;
Buck PFC link and half-bridge DC-DC converter link common switch pipe S
1
Input ac power is powered to the AB end by filter circuit E and rectifier bridge Q, and the AB terminal voltage is a half-sinusoid.Inductance L, switching tube S
1, diode D and capacitor C
1, C
2Constitute step-up/step-down circuit.Switching tube S
1And S
2, capacitor C
1And C
2Constitute half-bridge inversion circuit with transformer T.Diode D
O1, D
O2And capacitor C
OConstitute output rectifier and filter.Step-up/step-down circuit and half-bridge inversion circuit common switch pipe S
1One end of inductance L is connected with the common cathode of the negative electrode of diode D, rectifier bridge Q; The other end of inductance L and capacitor C
1An end, switching tube S
1Drain electrode connect; Capacitor C
1The other end and capacitor C
2An end connect, and then be connected with the different name end of transformer T primary side; Capacitor C
2The other end be connected with the anode of diode D, then with switching tube S
2Source electrode connect; Switching tube S
1Source electrode be connected and then and S with the common anode of rectifier bridge Q
2The end of the same name of drain electrode, transformer T primary side connect.
Fig. 3 has provided circuit working process of the present utility model, and Fig. 4 has provided the work wave of the utility model in a switch periods, and Fig. 5 provides the main waveform of the utility model under the power frequency pattern.Make switching tube S
1And S
1Duty ratio equate.
(1) in a switch periods, the circuit working process is as follows:
Stage 1 (t
0~t
1), as Fig. 3 a:t
0Constantly, switching tube S
1Conducting, inductance L is at input voltage V
ABThe lower linear charging, output rectifier diode D
O1Conducting, energy is by capacitor C
1Be delivered to V
O
Stages 2 (t
1~t
2), as Fig. 3 b:t
1Constantly, switching tube S
1And S
2Turn-off, inductance L is at (V
C1+ V
C2) discharge of voltage lower linear, capacitor C is transferred in the energy storage of inductance L
1And C
2Output rectifier diode D
O1And D
O2Instead end output capacitance C partially
ODischarge and powering load.
Stages 3 (t
2~t
3), as Fig. 3 c:t
2Constantly, switching tube S
2Conducting, inductance L continues at (V
C1+ V
C2) discharge of voltage lower linear, output rectifier diode D
O2Conducting, energy is by capacitor C
2Be delivered to V
O
Stages 4 (t
3~t
4), as Fig. 3 d:t
3Constantly, switching tube S
1And S
2Turn-off, inductance L continues at (V
C1+ V
C2) discharge of voltage lower linear, capacitor C is transferred in the energy storage of inductance L
1And C
2Output rectifier diode D
O1And D
O2Instead end output capacitance C partially
ODischarge and powering load.Current i when inductance L
LWhen dropping to zero, this stage finishes.
Stages 5 (t
4~t
5), as Fig. 3 e:t
4Constantly, switching tube S
1And S
2Turn-off the current i of inductance L
LDrop to zero, output rectifier diode D
O1And D
O2Instead end output capacitance C partially
ODischarge and powering load.
(2) the buck principle of buck PFC link
t
0~t
1The stage inductance is at input voltage V
ABThe lower linear charging, the increment of electric current is:
D wherein
ONBe switching tube S
1The conducting duty ratio, T is a switch periods.
t
1~t
4The stage inductance is at voltage (V
C1+ V
C2) the lower linear discharge, the increment of electric current is:
D wherein
OFFIt is the duty ratio of inductance L discharge.
When circuit working in inductive current i
LDuring discontinuous mode, Δ i is arranged
L1=| Δ i
L2|, can get thus
V
ABAmplitude equal power supply V
InAmplitude, therefore
Work as D as can be known by formula (4)
ON>D
OFFThe time, V
C1+ V
C2>V
InWork as D
ON<D
OFFThe time, V
C1+ V
C2<V
InCan carry out initial adjustment to the terminal voltage of electric capacity by the control duty ratio, and reduce duty ratio D
ONEffective control capacitance C
1And C
2The terminal voltage sum be lower than the input voltage amplitude, thereby reduced switching tube S
1And S
2Voltage stress.
(3) input power factor correction principle
Because inductive current i
LIntermittently, at switching tube S
1Each conducting phase i
LCurrent peak and this conducting phase input voltage V
CAB(V
CAB=| V
In|) mean value proportional, again because the average voltage of each conducting phase is a sinusoidal variations, so the peak value of input current also is a sinusoidal variations.And the inductive current pulse always starts from scratch, so their mean value also is sinusoidal variations, as shown in Figure 5.All alternating current pulses have been formed waveform and have been comprised 50 or first-harmonic and the switching frequency component of 60Hz frequency, through L
In, C
InFilter circuit E gets Sinusoidal Input Currents i
Lin
Claims (2)
1, a kind of single stage semi-bridge AC-DC converter comprises input filter circuit (E), rectifier bridge (Q), inductance (L), the first electric capacity (C
1), the second electric capacity (C
2), the 3rd electric capacity (C
O), the first switching tube (S
1), second switch pipe (S
2), the first diode (D
O1), the second diode (D
O2) and the 3rd diode (D); It is characterized in that input filter circuit (E) constitutes the input rectifying filter circuit with rectifier bridge (Q); Input filter circuit (E), rectifier bridge (Q), inductance (L), switching tube (S
1), diode (D) and the first electric capacity (C
1), the second electric capacity (C
2) formation buck PFC link; First switching tube (the S
1) and second switch pipe (S
2), the first electric capacity (C
1), the second electric capacity (C
2), transformer (T) and the first diode (D
O1) and the second diode (D
O2) formation half-bridge DC-DC converter link; The shared first switching tube (S of described buck PFC link and half-bridge DC-DC converter link
1).
2, single stage semi-bridge AC-DC converter according to claim 1 is characterized in that, an end of inductance (L) is connected with the common cathode of the negative electrode of the 3rd diode (D), rectifier bridge (Q); The other end of inductance (L) and the first electric capacity (C
1) an end, the first switching tube (S
1) drain electrode connect; First electric capacity (the C
1) the other end and the second electric capacity (C
2) an end connect, and then be connected with the different name end of transformer (T) primary side; Second electric capacity (the C
2) the other end be connected with the anode of the 3rd diode (D), then with second switch pipe (S
2) source electrode connect; First switching tube (the S
1) source electrode be connected with the common anode of rectifier bridge (Q), and then with second switch pipe (S
2) the end of the same name of drain electrode, transformer (T) primary side connect.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNU200920050527XU CN201345618Y (en) | 2009-01-20 | 2009-01-20 | Single-stage semibridge AD-DC converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNU200920050527XU CN201345618Y (en) | 2009-01-20 | 2009-01-20 | Single-stage semibridge AD-DC converter |
Publications (1)
Publication Number | Publication Date |
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CN201345618Y true CN201345618Y (en) | 2009-11-11 |
Family
ID=41277203
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CNU200920050527XU Expired - Fee Related CN201345618Y (en) | 2009-01-20 | 2009-01-20 | Single-stage semibridge AD-DC converter |
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CN (1) | CN201345618Y (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101499732B (en) * | 2009-01-20 | 2011-05-18 | 华南理工大学 | Single stage semi-bridge AC-DC converter |
TWI792605B (en) * | 2021-10-08 | 2023-02-11 | 大陸商蘇州明緯科技有限公司 | Three-phase power factor correction device |
-
2009
- 2009-01-20 CN CNU200920050527XU patent/CN201345618Y/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101499732B (en) * | 2009-01-20 | 2011-05-18 | 华南理工大学 | Single stage semi-bridge AC-DC converter |
TWI792605B (en) * | 2021-10-08 | 2023-02-11 | 大陸商蘇州明緯科技有限公司 | Three-phase power factor correction device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091111 Termination date: 20150120 |
|
EXPY | Termination of patent right or utility model |