CN203788181U - Half-bridge type power converter with APFC function - Google Patents
Half-bridge type power converter with APFC function Download PDFInfo
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- CN203788181U CN203788181U CN201420198863.XU CN201420198863U CN203788181U CN 203788181 U CN203788181 U CN 203788181U CN 201420198863 U CN201420198863 U CN 201420198863U CN 203788181 U CN203788181 U CN 203788181U
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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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Abstract
The utility model relates to a half-bridge type power converter with an APFC function. The half-bridge type power converter is formed by an input capacitor (Cx), a PFC inductor (Lx), a diode (D1), a diode (D2), a switching tube (Q1), a switching tube (Q2), a direct current capacitor (Cd), a half-bridge capacitor (Cs1), a half-bridge capacitor (Cs2), a current sensing resistor (Rs), an overcurrent overvoltage protector (1), a difference module common mode filter (2), a controller (3) and an equivalent load (4). According to the converter, a rectifier bridge is omitted, APFC and conversion of DC-AC are achieved through a single-stage half bridge, all devices operate symmetrically in turn, power consumption and heat dissipation are balanced, and current stress of the switching tube (Q1) and the switching tube (Q2) and ripple currents of the direct current capacitor (Cd) are effectively reduced. The converter is ingenious in topology, easy to control, low in cost, high in efficiency and reliability and capable of being widely applied to electric ballasts with 100-127V ac input, LED driving power supplies and other switch power converters.
Description
One, technical field
The utility model relates to a kind of semi-bridge type power inverter with APFC, is a kind of high frequency electronic switch converter, belongs to electric and electronic technical field.
Two, background technology
At present, the switching power converters such as electronic ballast for high-power energy-saving, LED driving power, General Requirements High Power Factor.Circuit of power factor correction divides two kinds, and one is that passive-type another kind is active.Passive-type circuit of power factor correction (as filling out paddy circuit, charge pump circuit) structure is simpler, and PF value, more than 0.9, is generally used for middle low power converter.Active circuit of power factor correction (as Boost type APFC topology) structure is complicated with control, and PF value, more than 0.96, is generally used for middle high power converter.
Electric ballast and LED driving power are the typical field of application of power electronic technology.Not only require converter to there is High Power Factor, and also have professional performance index requirement.For electronic ballast for high-power energy-saving, the crest factor of lamp current is one of important professional performance index, and GB requires crest factor λ≤1.7; Passive-type circuit of power factor correction is difficult to meet the demands, especially under the application conditions of 100～127Vac line voltage.LED illumination is new generation of green illumination, and LED driving power has also just been proposed to higher standard, and General Requirements power factor is more than 0.96; Middle high-power LED driving power source mostly adopts two stage power conversion, be that prime is active circuit of power factor correction (mostly being Boost type APFC topology), rear class is DC-AC-DC conversion (isolation or non-isolation, constant current, constant voltage or have it concurrently).But Boost type APFC topological circuit control complexity, cost are high, cause the total cost of two stage power translation circuit high, gross efficiency is low, complex structure, volume are bigger than normal, and reliability reduces.
The purpose of this utility model is, overcome above-mentioned the deficiencies in the prior art, a kind of semi-bridge type power inverter with APFC is provided, it is applicable to the input of 100～127Vac voltage, complete DC-AC (or DC-AC-DC) conversion by single stage semi-bridge circuit, realize active power factor correction (APFC) simultaneously.This converter topology exquisiteness, control simple and easyly, cost is low, efficiency is high, reliability is high.Can be widely used in the switching power converter such as electric ballast, LED driving power of 100～127Vac input.
Three, utility model content
The utility model is achieved in that
With a semi-bridge type power inverter of APFC, as shown in Figure 1.It is made up of input capacitance (Cx), PFC inductance (Lx), diode (D1, D2), switching tube (Q1, Q2), DC capacitor (Cd), half-bridge electric capacity (Cs1, Cs2) and over-current overvoltage protector (1), differential mode common-mode filter (2), controller (3), equivalent load (4).
Equivalent load (4) as shown in Figure 2, can be divided into two kinds of situations.Fig. 2 (a) is the equivalent load schematic diagram of electric ballast, and it is made up of filtering hold concurrently resonant capacitance (Cp) and the fluorescent tube (RL) of resonant inductance (Ls), filtering of holding concurrently.Fig. 2 (b) is the equivalent load schematic diagram of LED driving power, and it is made up of primary winding (Lp), secondary winding (Ls1, Ls2), rectifier diode (Do1, Do2), filter capacitor (Co) and LED light source (Ro).
The annexation of the each components and parts of this converter is: 100～127Vac AC power connects input capacitance (Cx) by over-current overvoltage protector (1), differential mode common-mode filter (2).The negative electrode of diode (D1) is connected as node Vd with one end of DC capacitor (Cd), the anode of diode (D2) is connected as node GND with the other end of DC capacitor (Cd), and the anode of diode (D1) is connected as node Va with the negative electrode of diode (D2).The drain electrode connected node Vd of switching tube (Q1); The source electrode connected node GND of switching tube (Q2); The source electrode of switching tube (Q1) is connected as node Vb with the drain electrode of switching tube (Q2).One end connected node Vd of half-bridge electric capacity (Cs1), one end connected node GND of half-bridge electric capacity (Cs2), the other end of half-bridge electric capacity (Cs1, Cs2) is connected as node Vc.One end connected node Va of input capacitance (Cx), the other end of input capacitance (Cx) connects one end of PFC inductance (Lx), the other end connected node Vb of PFC inductance (Lx).The grid of two switching tubes (Q1, Q2) connects controller (3).One end connected node Vb of equivalent load (4), the other end connected node Vc of equivalent load (4).
Half-bridge electric capacity (Cs1, Cs2) can remove wherein any, thereby further simplifies circuit, but can increase like this high frequency ripple electric current of DC capacitor (Cd).
The operation principle of this converter is summarized as follows:
Switching tube (Q1, Q2) symmetrical break-make in turn, not only realizes the DC-AC conversion to equivalent load (4) power supply, and coordinates diode (D1, D2) to complete active power factor correction (APFC).
In the time of the positive half cycle of simple alternating current input power, the voltage of input capacitance (Cx) is upper just lower negative, realizes active power factor correction by switching tube (Q2) and diode (D2).When switching tube (Q1) shutoff, (Q2) conducting, input capacitance (Cx) is given PFC inductance (Lx) charging by switching tube (Q2) and diode (D2); Meanwhile, DC capacitor (Cd) series connection half-bridge electric capacity (Cs1) again half-bridge electric capacity in parallel (Cs2) give equivalent load (4) electric discharge by switching tube (Q2).When switching tube (Q2) shutoff, (Q1) conducting, the electric current of PFC inductance (Lx) is given DC capacitor (Cd) charging by switching tube (Q1), diode (D2) and input capacitance (Cx); Meanwhile, DC capacitor (Cd) series connection half-bridge electric capacity (Cs2) again half-bridge electric capacity in parallel (Cs1) give equivalent load (4) electric discharge by switching tube (Q1).
In the time of the negative half period of simple alternating current input power, the voltage of input capacitance (Cx) is upper negative lower F, realizes active power factor correction by switching tube (Q1) and diode (D1).When switching tube (Q2) shutoff, (Q1) conducting, input capacitance (Cx) is given PFC inductance (Lx) charging by diode (D1) and switching tube (Q1); Meanwhile, DC capacitor (Cd) series connection half-bridge electric capacity (Cs2) again half-bridge electric capacity in parallel (Cs1) give equivalent load (4) electric discharge by switching tube (Q1).When switching tube (Q1) shutoff, (Q2) conducting, the electric current of PFC inductance (Lx) is given DC capacitor (Cd) charging by diode (D1), switching tube (Q2) and input capacitance (Cx); Meanwhile, DC capacitor (Cd) series connection half-bridge electric capacity (Cs1) again half-bridge electric capacity in parallel (Cs2) give equivalent load (4) electric discharge by switching tube (Q2).
As seen from the above analysis: one, at switching tube (Q1, Q2) in turn during symmetrical break-make, by switching tube (Q1, Q2) give the charging current of DC capacitor (Cd) and discharging current some cancel out each other, not only reduce the current stress of switching tube (Q1, Q2), and having reduced the ripple current of DC capacitor (Cd), this has a clear superiority in for reducing device capacity and raising the efficiency.Two, due to the existence of Dead Time (first closing the interval time of conducting of having no progeny), the conducting duty ratio of switching tube (Q1, Q2) is slightly less than 0.5, and along with the raising of switching frequency, effective duty cycle reduces.Therefore the voltage of DC capacitor (Cd) can be higher than the simple alternating current input voltage peak value of 2 times, and the voltage stress of switching tube is also just not too large.
In design, to note 3 points: the first, preferably make PFC inductance (Lx) work in discontinuous current pattern (DCM) and critical continuous conduction mode (CRM), be conducive to like this improve power factor and efficiency.Be exactly specifically near sinusoidal input voltage peak value, to work in CRM pattern, and near trough, work in DCM pattern.The second, can utilize fine setting FREQUENCY CONTROL (PFM), further improve power factor and stable power output.That is: along with input voltage mean value and the instantaneous value corresponding raising switching frequency that raises, on the contrary also anti-.The 3rd, preferably add the overvoltage of DC capacitor (Cd) to detect and protection, because come off or pipeline start up by preheating when failure at fluorescent tube, the voltage of DC capacitor (Cd) can raise.
The main electric weight relational expression of this converter:
Be located at simple alternating current input voltage (V
s) peak value V
pplace, the just in time critical continuous mode of electric current of PFC inductance (Lx).If the conducting duty ratio of switching tube (Q1, Q2) is symmetrical and be D
on, switching frequency is f
s.
Simple alternating current input voltage (V
s) peak value Vp be:
The voltage V of DC capacitor (Cd)
dcfor (alternating current component that contains 2 times of input power frequencies):
If the efficiency of converter is η, power output is P
o, input power P
ifor:
P
i＝P
o/η (3)
Simple alternating current input voltage (V
s) time, the peak current I of PFC inductance (Lx)
lPfor:
The inductance value of PFC inductance (Lx) is:
In formula, k is called form factor, ≈ 0.9.Because inductive current is not the sinusoidal waveform of standard.
Input capacitance (Cx) can be chosen by 12～20nF/W, and DC capacitor (Cd) can be chosen by 220～330nF/W.
The utility model compared with prior art has following superiority:
1) the utility model is realized APFC by single stage semi-bridge and DC-AC converts, simple in structure, control easily, cost is low;
2) the utility model has saved rectifier bridge, further simplifies the structure, has reduced cost, improved efficiency;
3) all symmetrical work in turn of the device such as switching tube of the present utility model and diode, power consumption with dispel the heat balanced, reliability is high;
4) the utility model effectively reduces the current stress of switching tube and the ripple current of DC capacitor, is conducive to reduce device capacity and improves conversion efficiency.
Four, brief description of the drawings
Fig. 1 is a kind of circuit theory diagrams of the semi-bridge type power inverter with APFC.
In Fig. 1, Cx---input capacitance, Lx---PFC inductance, D1, D2---diode, Q1, Q2---switching tube, Cd---DC capacitor, Cs1, Cs2---half-bridge electric capacity, 1---over-current overvoltage protector, 2---differential mode common-mode filter, 3---controller, 4---equivalent load.
Fig. 2 is a kind of circuit theory diagrams of equivalent load (4) of the semi-bridge type power inverter with APFC; Fig. 2 (a) is the equivalent load schematic diagram of electric ballast, and Fig. 2 (b) is the equivalent load schematic diagram of LED driving power.
In Fig. 2 (a), Ls---the filtering resonant inductance of holding concurrently, Cp---the filtering resonant capacitance of holding concurrently, RL---fluorescent tube.In Fig. 2 (b), Lp---primary winding, Ls1, Ls2---transformer secondary output winding, Do1, Do2---rectifier diode, Co---filter capacitor, Ro---LED light source.
Five, embodiment
With most preferred embodiment in detail the utility model is described in detail below in conjunction with accompanying drawing.
As shown in Figure 1; with a semi-bridge type power inverter of APFC, it is made up of input capacitance (Cx), PFC inductance (Lx), diode (D1, D2), switching tube (Q1, Q2), DC capacitor (Cd), half-bridge electric capacity (Cs1, Cs2) and over-current overvoltage protector (1), differential mode common-mode filter (2), controller (3), equivalent load (4).
As shown in Figure 2, equivalent load (4) can be divided into two kinds of situations.Taking the equivalent load schematic diagram of electric ballast shown in Fig. 2 (a) as example, it is made up of filtering hold concurrently resonant capacitance (Cp) and the fluorescent tube (RL) of resonant inductance (Ls), filtering of holding concurrently.
The annexation of the each components and parts of this converter is: 100～127Vac AC power connects input capacitance (Cx) by over-current overvoltage protector (1), differential mode common-mode filter (2).The negative electrode of diode (D1) is connected as node Vd with one end of DC capacitor (Cd), the anode of diode (D2) is connected as node GND with the other end of DC capacitor (Cd), and the anode of diode (D1) is connected as node Va with the negative electrode of diode (D2).The drain electrode connected node Vd of switching tube (Q1); The source electrode connected node GND of switching tube (Q2); The source electrode of switching tube (Q1) is connected as node Vb with the drain electrode of switching tube (Q2).One end connected node Vd of half-bridge electric capacity (Cs1), one end connected node GND of half-bridge electric capacity (Cs2), the other end of half-bridge electric capacity (Cs1, Cs2) is connected as node Vc.One end connected node Va of input capacitance (Cx), the other end of input capacitance (Cx) connects one end of PFC inductance (Lx), the other end connected node Vb of PFC inductance (Lx).The grid of two switching tubes (Q1, Q2) connects controller (3).One end connected node Vb of equivalent load (4), the other end connected node Vc of equivalent load (4).
Switching tube (Q1, Q2) symmetrical break-make in turn, not only realizes the DC-AC conversion to equivalent load (4) power supply, and coordinates diode (D1, D2) to complete active power factor correction (APFC).
In design, can realize 3 points: the first, make PFC inductance (Lx) work in discontinuous current pattern (DCM) and critical continuous conduction mode (CRM).Be exactly specifically that at sinusoidal input voltage peak value, place works in CRM pattern, and near trough, works in DCM pattern.The second, utilize integrated circuit to build controller (3), realize fine setting FREQUENCY CONTROL (PFM), further improve power factor and stable power output.That is: along with input voltage mean value and the instantaneous value corresponding raising switching frequency that raises, on the contrary also anti-.The 3rd, the voltage of detection DC capacitor (Cd), realizes overvoltage protection.
Specific design parameter is: simple alternating current input supply voltage V
s=125V//60Hz, switching tube duty ratio D
on=0.48, switching frequency f
s=55kHz, conversion efficiency η=0.9, power factor PF>=0.97, power output P
o=100W.Fluorescent tube RL=Φ 17/6U.
Show that according to formula (1)～formula (5) data are as follows:
V
p＝176.8V，V
dc＝339.5V，P
i＝111.1W，I
LP＝2.51A，L
x＝0.53mH。
Get Cx=1.5uF/250V, Cd=33uF/450V, Cs1=Cs2=100nF/630V; Q1=Q2=STP12NM50N, D1=D2=SF38.Ls＝1.1mH，Cp＝6.8nF/1.6kV。
Claims (2)
1. the semi-bridge type power inverter with APFC, it is made up of input capacitance (Cx), PFC inductance (Lx), diode (D1, D2), switching tube (Q1, Q2), DC capacitor (Cd), half-bridge electric capacity (Cs1, Cs2) and over-current overvoltage protector (1), differential mode common-mode filter (2), controller (3), equivalent load (4); 100～127Vac AC power connects input capacitance (Cx) by over-current overvoltage protector (1), differential mode common-mode filter (2); It is characterized in that: the negative electrode of diode (D1) is connected as node Vd with one end of DC capacitor (Cd), the anode of diode (D2) is connected as node GND with the other end of DC capacitor (Cd), and the anode of diode (D1) is connected as node Va with the negative electrode of diode (D2); The drain electrode connected node Vd of switching tube (Q1); The source electrode connected node GND of switching tube (Q2); The source electrode of switching tube (Q1) is connected as node Vb with the drain electrode of switching tube (Q2); One end connected node Vd of half-bridge electric capacity (Cs1), one end connected node GND of half-bridge electric capacity (Cs2), the other end of half-bridge electric capacity (Cs1, Cs2) is connected as node Vc; One end connected node Va of input capacitance (Cx), the other end of input capacitance (Cx) connects one end of PFC inductance (Lx), the other end connected node Vb of PFC inductance (Lx); The grid of two switching tubes (Q1, Q2) connects controller (3); One end connected node Vb of equivalent load (4), the other end connected node Vc of equivalent load (4).
2. a kind of semi-bridge type power inverter with APFC according to claim 1, is characterized in that half-bridge electric capacity (Cs1, Cs2) can remove wherein any.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420198863.XU CN203788181U (en) | 2014-04-12 | 2014-04-12 | Half-bridge type power converter with APFC function |
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|---|---|---|---|
| CN201420198863.XU CN203788181U (en) | 2014-04-12 | 2014-04-12 | Half-bridge type power converter with APFC function |
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| CN203788181U true CN203788181U (en) | 2014-08-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105792432A (en) * | 2016-04-19 | 2016-07-20 | 瑞金市得邦照明有限公司 | Drive circuit applicable to high-power energy-saving lamp |
| CN110971134A (en) * | 2019-12-19 | 2020-04-07 | 南京微盟电子有限公司 | Rectifier diode voltage drop compensation system of non-isolated switch power supply |
-
2014
- 2014-04-12 CN CN201420198863.XU patent/CN203788181U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105792432A (en) * | 2016-04-19 | 2016-07-20 | 瑞金市得邦照明有限公司 | Drive circuit applicable to high-power energy-saving lamp |
| CN110971134A (en) * | 2019-12-19 | 2020-04-07 | 南京微盟电子有限公司 | Rectifier diode voltage drop compensation system of non-isolated switch power supply |
| CN110971134B (en) * | 2019-12-19 | 2021-06-22 | 南京微盟电子有限公司 | Rectifier diode voltage drop compensation system of non-isolated switch power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170419 Address after: Tung Chung town Nansha District Guangzhou city Guangdong province Yufeng road 510000 No. 56 Patentee after: Guangzhou bodi Photoelectric Technology Co Ltd Address before: No. 56 R & D department bohdi Yufeng road Datong Village Industrial Zone Guangzhou Nansha District Tung Chung town in Guangdong province 511475 Patentee before: Zhang Chaohui |
|
| TR01 | Transfer of patent right | ||
| DD01 | Delivery of document by public notice |
Addressee: Zhang Chaohui Document name: Notification of Passing Examination on Formalities |
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| DD01 | Delivery of document by public notice | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20210412 |
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| CF01 | Termination of patent right due to non-payment of annual fee |