CN103280979B - Recommend output switch power source - Google Patents
Recommend output switch power source Download PDFInfo
- Publication number
- CN103280979B CN103280979B CN201310262965.3A CN201310262965A CN103280979B CN 103280979 B CN103280979 B CN 103280979B CN 201310262965 A CN201310262965 A CN 201310262965A CN 103280979 B CN103280979 B CN 103280979B
- Authority
- CN
- China
- Prior art keywords
- error amplifying
- unit
- power source
- amplifying unit
- recommend
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Dc-Dc Converters (AREA)
- Amplifiers (AREA)
Abstract
The present invention relates to switch power technology.The invention discloses one and recommend output switch power source, solve work in voltage mode control recommend output switch power source magnetic flux imbalance problem.Of the present inventionly recommend output switch power source, comprise pulse width modulation controlled unit, the first error amplifying unit, the second error amplifying unit, the first switching device, second switch device, recommend output transformer and average asks poor unit.The present invention passes through the ON time of control first switching device and second switch device, reduce the ON time of larger elementary half winding of Flux consumption, increase the ON time of less elementary half winding of Flux consumption, make the Flux consumption of two elementary half windings equal, realize the control to magnetic flux balance.Switching Power Supply work of the present invention in voltage mode control, does not need slope-compensation, does not introduce extra power consumption, and circuit working is stablized.Recommend elementary half winding current of two, output transformer balanced, recommend output transformer magnetic flux balance.
Description
Technical field
The present invention relates to switch power technology, particularly recommend output switch power source under voltage mode control, magnetic flux balance control technology.
Background technology
The basic structure of recommending output switch power source under pulse-width modulation generally includes pulse width modulation controlled unit, error amplifying unit, the first switching device, second switch device, recommends output transformer and current rectifying and wave filtering circuit etc. thereof.Error amplifying unit output is connected with pulse width modulation controlled unit, and input connects output voltage dividing potential drop and reference voltage respectively, according to the difference output error voltage of output voltage dividing potential drop and reference voltage.The error voltage that pulse width modulation controlled unit exports according to error amplifying unit and pwm signal, produce two-way drive singal and drive the first switching device and second switch device respectively.First switching device is connected with supply voltage with two elementary half windings of second switch device respectively by push-pull transformer, converts supply voltage to high-frequency pulse voltage, provides direct voltage finally by current rectifying and wave filtering circuit to load.Several factors all can cause reset Flux consumption during this kind of Switching Power Supply conducting unequal with reset Flux consumption when turning off, thus several all after dates, the magnetic core of recommending output transformer will depart from magnetic hysteresis loop and enter saturation region.When magnetic core is saturated, transformer can not bear voltage, when next cycle switch device again conducting time, switching device will bear very large voltage and current, causes switching device to damage.Magnetic flux imbalance is the one of the main reasons of recommending the inefficacy of output switch power source control circuit under voltage mode control.
At present, recommend the unbalanced solution of output switch power source magnetic flux and mainly contain: the first, in magnetic core, increase air gap; The second, primary windings connected in series resistance; 3rd, use current control mode.But itself still there is a lot of shortcoming in these methods.Increase air gap in magnetic core can increase the direct current that magnetic core bears and be biased, increase dividing potential drop on the channel resistance of switching device by increasing electric current, and then reduce the Flux consumption of this half winding, make Flux consumption equal.But the MOS switch dissipation of big current side is large, fragile.The method of primary series resistance, the series resistance dividing potential drop on elementary half winding that Flux consumption can be made large is large, and then reduces the Flux consumption of this half winding, electric current is restored balance, but series resistance introduces very large power consumption, reduces the efficiency of Switching Power Supply.Use current control mode to be solve the unbalanced main method of magnetic flux now, but current-mode is unstable, needs slope-compensation.
Summary of the invention
In order to overcome the shortcoming of the uneven solution of above-mentioned traditional magnetic flux, the present invention proposes one and recommend output switch power source, adopt the magnetic flux balance control circuit under voltage mode control, solve work in voltage mode control recommend output switch power source magnetic flux imbalance problem, do not need slope-compensation, do not introduce extra power consumption.
The technical scheme that the present invention solve the technical problem employing is, recommend output switch power source, comprise pulse width modulation controlled unit, first error amplifying unit, second error amplifying unit, first switching device, second switch device and recommend output transformer, described first error amplifying unit is connected with pulse width modulation controlled unit with the second error amplifying unit output, input connects output voltage dividing potential drop and reference voltage respectively, the drive singal that described pulse width modulation controlled unit exports drives the first switching device and second switch device respectively, described first switching device is connected with supply voltage with two elementary half windings of second switch device respectively by push-pull transformer, it is characterized in that, also comprise average and ask poor unit, described average asks poor unit input to connect the first switching device and second switch device respectively, the average current of two elementary half windings is sampled respectively, obtain sampled voltage V
s1and V
s2, by signed magnitude arithmetic(al), obtain the voltage V of two reflections, two elementary half winding average current sizes
1and V
2, by V
1and V
2be input to the first error amplifying unit and the second error amplifying unit respectively, finally by the ON time of pulse width modulation controlled unit controls first switching device and second switch device, reduce the ON time of larger elementary half winding of Flux consumption, increase the ON time of less elementary half winding of Flux consumption, make the Flux consumption of two elementary half windings equal, realize the control to magnetic flux balance.
Recommend, described first error amplifying unit is identical with the second error amplifying unit structure.
Concrete, described first switching device and second switch device are IGBT.
Concrete, described first switching device and second switch device are field-effect transistor.
Concrete, described average asks poor unit to be made up of two operational amplifiers and peripheral circuit thereof.
The invention has the beneficial effects as follows, Switching Power Supply work in voltage mode control, does not need slope-compensation, and circuit working is stablized.Recommend elementary half winding current of two, output transformer balanced, avoid switching device overcurrent to generate heat.Recommend output transformer magnetic flux balance, magnetic hysteresis loop can not be departed from and enter saturation region.Do not introduce series resistance, without extra power consumption, switch power efficiency is high.Control circuit is applicable to integrated, is applicable to BCD integrated circuit technology and BiCMOS integrated circuit technology.
Accompanying drawing explanation
For making object of the present invention, technical scheme clearly, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in further details.
Fig. 1 is circuit diagram of the present invention;
Fig. 2 is error amplifying unit circuit diagram;
Fig. 3 is pulse width modulation controlled element circuit figure;
Fig. 4 average asks the circuit diagram of poor unit;
Fig. 5 is ON time and the On current waveform of two and half windings when not adding magnetic flux balance control circuit;
The ON time of two and half windings when Fig. 6 is increase magnetic flux balance control circuit and On current waveform.
Embodiment
As shown in Figure 1, of the present inventionly recommend output switch power source, comprise pulse width modulation controlled unit, the first error amplifying unit, the second error amplifying unit, the first switching element T 1, second switch device T2 and recommend output transformer T.First error amplifying unit is connected with pulse width modulation controlled unit with the second error amplifying unit output, and input connects output voltage V respectively
oUTdividing potential drop V
bwith reference voltage V
ref.Drive singal Dr1 and Dr2 that pulse width modulation controlled unit exports drives the first switching element T 1 and second switch device T2 respectively, and switching element T 1 of the present invention and T2 can be field-effect transistors, also can be IGBT.Fig. 1 is using IGBT as switching device.First switching element T 1 and second switch device T2 are respectively by two elementary half windings of push-pull transformer T and supply voltage V
iNconnect, switching element T 1 connects the first elementary half winding, and switching element T 2 connects the second elementary half winding.Of the present inventionly recommend output switch power source, also comprise average and ask poor unit, average asks poor unit input to connect the emitter current sampling resistor R of the first switching element T 1 and second switch device T2 respectively
3, R
4, the average current of two elementary half windings is sampled respectively, by signed magnitude arithmetic(al), obtains the voltage V of two reflections, two elementary half winding average current sizes
1and V
2, by V
1and V
2be input to the first error amplifying unit and the second error amplifying unit respectively, finally by the ON time of pulse width modulation controlled unit controls first switching element T 1 and second switch device T2, reduce the ON time of larger elementary half winding of Flux consumption, increase the ON time of less elementary half winding of Flux consumption, make the Flux consumption of two elementary half windings equal, realize the control to magnetic flux balance.In Fig. 1, resistance R
1, R
2for the resistance of IGBT.Resistance R
5, R
6for output voltage V
oUTdivider resistance, resistance R
5, R
6link export dividing potential drop V
b.Diode D1, D2, inductance L and electric capacity C
0form current rectifying and wave filtering circuit, resistance R
0for load resistance.
First error amplifying unit of the present invention is identical with the second error amplifying unit structure, and Fig. 2 is its implementation circuit theory diagrams, is described below for the first error amplifying unit.The inverting input of resistance R31 mono-termination error amplifier EA1, another termination reference voltage V
ref; Resistance R
32the in-phase input end of one termination error amplifier EA1, another termination output voltage V
oUTdividing potential drop V
b; Resistance R
33the in-phase input end of one termination error amplifier EA1, another termination average asks poor unit output voltage V
1; Resistance R
34the in-phase input end of one termination error amplifier EA1, other end ground connection; Electric capacity C
21the inverting input of one termination error amplifier EA1, the output of another termination error amplifier EA1.
Fig. 3 is a kind of implementation circuit theory diagrams of pulse width modulation controlled unit.Operational amplifier A MP
22anti-phase input termination first error amplifying unit export error voltage V
eAO1, in-phase input end connects pwm signal.Operational amplifier A MP
24anti-phase input termination second error amplifying unit export error voltage V
eAO2, in-phase input end connects pwm signal.The input termination square wave oscillation signal OSC of two divided-frequency unit, output Q and operational amplifier A MP
22output by exporting with door computing; Output QN and operational amplifier A MP
24output by exporting with door computing.Two operational amplifier A MP
22and AMP
24connect the output of different error amplifying units, obtain the output of distinct pulse widths.With the square wave oscillation signal OSC of PWM same frequency, produce two complementary level Q and QN of height by two divided-frequency, alternately shielding operational amplifier A MP
22and AMP
24output, two drive singal Dr1 and Dr2 exported with door make two switching devices only have a conducting all the time.
Fig. 4 is a kind of implementation circuit theory diagrams that average asks poor unit, by two operational amplifier A MP
13and AMP
12and peripheral circuit is formed.Resistance R
11the sampled voltage V of the average current of elementary half winding of one termination first
s1, another termination capacitor C
11with resistance R
19, resistance R
22, electric capacity C
11other end ground connection.Resistance R
19another termination operational amplifier A MP
12in-phase input end, resistance R
22another termination operational amplifier A MP
13inverting input.Resistance R
12the sampled voltage V of the average current of elementary half winding of one termination second
s2, another termination capacitor C
12with resistance R
18, resistance R
23, electric capacity C
12other end ground connection.Resistance R
18another termination operational amplifier A MP
12inverting input, resistance R
23another termination operational amplifier A MP
13in-phase input end.Resistance R
20one end ground connection, another termination operational amplifier A MP
12in-phase input end.Resistance R
25one end ground connection, another termination operational amplifier A MP
13in-phase input end.Resistance R
21a termination operational amplifier A MP
12inverting input, another termination AMP
12output and the first output.Resistance R
24a termination operational amplifier A MP
13inverting input, another termination AMP
13output and the second output.Sampled voltage V
s1pass through R
11, C
11the RC low pass filter formed, sampled voltage V
s2pass through R
12, C
12the RC low pass filter formed, carries out plus and minus calculation after filtering again, wherein, and the first output V
1output voltage V
1=A (V
s1av-V
s2av), the second output V
2output voltage V
2=A (V
s2av-V
s1av).Wherein, R
18=R
19=R
22=R
23, R
20=R
21=R
24=R
25; V
s1avsampled voltage V
s1mean value, V
s2avsampled voltage V
s2mean value;
it is the multiplication factor that average asks poor unit.
Fig. 5 is ON time and the On current waveform of two and half windings when not adding magnetic flux balance control circuit.As shown in the figure, d1 is that the conducting of the first elementary half winding (half winding be connected with switching element T 1) turns off waveform, and ON time 15.601us, i (r.r1) are the current waveforms of the first elementary half winding, peak current 6.9348A; D2 is that the conducting of the second elementary half winding (half winding be connected with switching element T 2) turns off waveform, and ON time 14.893us, i (r.r17) are the current waveforms of the second elementary half winding, peak current 4.9142A.The ON time difference of two elementary half windings only has 708ns, but peak current difference 2.0206A, be 34% of two elementary half winding average peak current.Due to the existence of sampling resistor and switching device channel resistance, when two elementary half winding currents differences are larger, sampling resistor and switching device channel resistance bear larger pressure drop, finally make magnetic flux balance, and avoid the electric current of one of them elementary half winding infinitely to increase.But, sampling resistor and the switching device channel resistance of the larger side of electric current bear larger pressure drop and electric current, this side are generated heat serious, reduce the life-span of this side switching device and sampling resistor, under serious conditions, this side switching device and the direct cause thermal damage of sampling resistor can be made.
The ON time of two and half windings when Fig. 6 is increase magnetic flux balance control circuit and On current waveform.As shown in the figure, d1 is that the conducting of the first elementary half winding turns off waveform, and ON time 15.267us, i (r.r1) are the current waveforms of the first elementary half winding, peak current 5.9579A; D2 is that the conducting of the second elementary half winding turns off waveform, and ON time 15.297us, i (r.r17) are the current waveforms of the second elementary half winding, peak current 5.8953A.The ON time of two elementary half windings is substantially equal, and peak current is also substantially equal.
Claims (5)
1. recommend output switch power source, comprise pulse width modulation controlled unit, first error amplifying unit, second error amplifying unit, first switching device, second switch device and recommend output transformer, described first error amplifying unit is connected with pulse width modulation controlled unit with the second error amplifying unit output, input connects output voltage dividing potential drop and reference voltage respectively, the drive singal that described pulse width modulation controlled unit exports drives the first switching device and second switch device respectively, described first switching device is connected with supply voltage with two elementary half windings of second switch device respectively by push-pull transformer, it is characterized in that, also comprise average and ask poor unit, described average asks poor unit input to connect the first switching device and second switch device respectively, the average current of two elementary half windings is sampled respectively, obtain sampled voltage V
s1and V
s2, by signed magnitude arithmetic(al), obtain the voltage V of two reflections, two elementary half winding average current sizes
1and V
2, by V
1and V
2be input to the first error amplifying unit and the second error amplifying unit respectively, finally by the ON time of pulse width modulation controlled unit controls first switching device and second switch device, reduce the ON time of larger elementary half winding of Flux consumption, increase the ON time of less elementary half winding of Flux consumption, make the Flux consumption of two elementary half windings equal, realize the control to magnetic flux balance.
2. according to claim 1ly recommend output switch power source, it is characterized in that, described first error amplifying unit is identical with the second error amplifying unit structure.
3. according to claim 1ly recommend output switch power source, it is characterized in that, described first switching device and second switch device are IGBT.
4. according to claim 1ly recommend output switch power source, it is characterized in that, described first switching device and second switch device are field-effect transistor.
5. according to claim 1ly recommend output switch power source, it is characterized in that, described average asks poor unit to be made up of two operational amplifiers and peripheral circuit thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310262965.3A CN103280979B (en) | 2013-06-27 | 2013-06-27 | Recommend output switch power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310262965.3A CN103280979B (en) | 2013-06-27 | 2013-06-27 | Recommend output switch power source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103280979A CN103280979A (en) | 2013-09-04 |
| CN103280979B true CN103280979B (en) | 2016-01-20 |
Family
ID=49063453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310262965.3A Expired - Fee Related CN103280979B (en) | 2013-06-27 | 2013-06-27 | Recommend output switch power source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103280979B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9819271B2 (en) * | 2013-09-30 | 2017-11-14 | O2Micro, Inc. | Power converters |
| CN104534758B (en) * | 2014-12-12 | 2017-11-14 | 贵州永红航空机械有限责任公司 | A kind of refrigeration system based on push-pull converter |
| CN104821728A (en) * | 2014-12-13 | 2015-08-05 | 襄阳精圣科技信息咨询有限公司 | Push-pull converter for refrigerating system |
| CN104901552A (en) * | 2014-12-13 | 2015-09-09 | 襄阳精圣科技信息咨询有限公司 | Push-pull converter enabling voltage-based on-off control |
| CN106877681B (en) * | 2017-02-17 | 2018-06-22 | 中南大学 | It is a kind of for the supply convertor of Electronically Controlled Pneumatic Brake Systems and balance of flux adjusting method |
| CN110658805B (en) * | 2019-09-30 | 2020-12-01 | 天津市盛丹电子技术发展有限公司 | Signal calibration circuit of industrial building fire-fighting system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3737756A (en) * | 1972-05-15 | 1973-06-05 | Bell Telephone Labor Inc | Converter circuit with balanced parallel switching paths |
| CN1479440A (en) * | 2002-06-05 | 2004-03-03 | 欧姆龙株式会社 | Transforming device of push-pull circuit type |
| CN202818141U (en) * | 2012-09-24 | 2013-03-20 | 连云港杰瑞电子有限公司 | Inverter power supply suitable for low voltage battery power supply |
-
2013
- 2013-06-27 CN CN201310262965.3A patent/CN103280979B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3737756A (en) * | 1972-05-15 | 1973-06-05 | Bell Telephone Labor Inc | Converter circuit with balanced parallel switching paths |
| CN1479440A (en) * | 2002-06-05 | 2004-03-03 | 欧姆龙株式会社 | Transforming device of push-pull circuit type |
| CN202818141U (en) * | 2012-09-24 | 2013-03-20 | 连云港杰瑞电子有限公司 | Inverter power supply suitable for low voltage battery power supply |
Non-Patent Citations (1)
| Title |
|---|
| 一种新型的DC-DC转换器的分析设计;徐兵兵等;《微计算机信息》;20101015;第26卷(第10-2期);183-185 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103280979A (en) | 2013-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103280979B (en) | Recommend output switch power source | |
| KR102612384B1 (en) | ＰＷＭ capacitor control | |
| CN105305848A (en) | Boost inductor demagnetization detection for bridgeless boost pfc converter operating in boundary-conduction mode | |
| TW201535943A (en) | Method of forming a power supply controller and structure therefor | |
| CN109391155B (en) | Direct-current magnetic bias suppression method for bidirectional full-bridge DC/DC converter | |
| JPH07222493A (en) | Control equipment for dc actuator in electronic equipment for electric power | |
| CN103916036B (en) | A kind of Buck high frequency isolation type five-electrical level inverter | |
| TWI580166B (en) | Interleaved boost converter | |
| CN203574903U (en) | High-power factor constant current control circuit and LED lighting equipment | |
| CN103916015A (en) | Control device for dual-mode power supply switching | |
| CN103248226A (en) | Switching power supply controller of average current lagging mode | |
| CN203705525U (en) | Current detection circuit and control loop thereof | |
| CN103762839B (en) | A kind of magnetic coupling type single-phase high-gain Bridgeless power factor circuit correcting circuit | |
| Yusmarnita et al. | Design and analysis of 1MHz class-E power amplifier | |
| EP3167295A1 (en) | Sensing current flowing through a capacitor | |
| Saha et al. | Power consumption reduction in high current closed loop Hall Effect current sensors using Class D Amplifier | |
| CN204156738U (en) | A kind of power supply and control circuit thereof | |
| CN105429494B (en) | A kind of inverter power supply device and its control method | |
| CN203056968U (en) | Power supply circuit | |
| CN204669210U (en) | A kind of pulse driving circuit of electrical arc spraying power source | |
| CN209250489U (en) | power supply circuit and household appliance | |
| CN204179954U (en) | A kind of portable electronic voltage regulator | |
| CN203691696U (en) | Bridgeless LED drive circuit | |
| CN206811289U (en) | Current foldback circuit and IGBT inverter type welders applied to IGBT inverter type welders | |
| CN102332834A (en) | High-efficiency low-harmonic AC/DC (alternating current or direct current) converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20160627 |