CN103441666A - Power supply device achieving input-series and output-parallel of switching power supply - Google Patents
Power supply device achieving input-series and output-parallel of switching power supply Download PDFInfo
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Abstract
The invention discloses a power supply device achieving input-series and output-parallel of a switching power supply. The power supply device comprises two DC-DC converters. One of the DC-DC converters is a push-pull type converter which operates in an open-loop mode. The other DC-DC converter is a DC-DC converter which operates in a closed-loop mode, and output voltage of the DC-DC converter is stable. The input ends of the converters are connected in series, and the output ends of the converters are connected in parallel. The highest working voltage of the device with the series connection by the method is improved, the loop response of the power supply is good, cost is low, efficiency is high, and implementation is easy.
Description
Technical field
The present invention relates to the DC-DC converter circuit, particularly a kind of electric supply installation of realizing Switching Power Supply input series connection, output-parallel.
Background technology
In recent years, the Switching Power Supply volume small and exquisite with it, higher power density and high efficiency more and more were widely used.Industrial and civilianly all often need to use switch power parallel, to obtain larger power output.Fig. 1 shows this application, in Fig. 1 circuit, generally, the converter that the DC-DC converter 1 of digital 1 indication and the DC-DC converter of digital 2 indications 2 are same model, input Vin+ and Vin-are corresponding in parallel respectively, and its output end vo ut+ and Vout-are also in parallel respectively.Switching Power Supply after this combination of Fig. 1 is very harsh to the requirement of DC-DC converter 1 and DC-DC converter 2, require the converter 1 and 2 used in parallel, its characteristic will approach very much, otherwise the power supply that output voltage is high likely can provide whole load currents, cause load current imbalance between each converter, do not reach the effect in parallel of expection.This method often brings the frequency of a regularity to impact, and produces stronger interference, makes the ripple of its ripple much larger than two converter 1 or 2.This is because the operating frequency of DC-DC converter 1 and DC-DC converter 2 there are differences.Even adopt identical circuit, the converter that the same production line is produced, because also there is deviation in the operating frequency of the pwm chip of same product batch number, the operating frequency of DC-DC converter 1 and DC-DC converter 2 there are differences, its difference frequency will produce the frequency of a regularity and impact, produce stronger interference, at this moment also need external capacitor to reduce ripple.Solution to this problem has much at present, such as, adopt flow equalize technology, as allow the operating frequency of DC-DC converter 1 and DC-DC converter 2 keep highly consistent, and alternating expression work, like this, output ripple can be less.But the cost of this mode is very high, and DC- DC converter 1 and 2 is in when design, the collaborative interface in the time of all will reserving parallel connection.
Fig. 2 shows another kind of parallel method, sort circuit is a kind of Switching Power Supply scheme of utilizing redundant technique, two power output ends pass through diodes in parallel, the existence of diode, do not affect another power supply while allowing a wherein inefficacy and continue powering load, this mode is usually used in the important events that do not allow power supply to break down, rather than in order to obtain larger power output.This is because diode is helpless to current-sharing here.
Switching Power Supply using method after this combination of Fig. 1, do not improve the upper limit of input voltage vin, and this application mode is equal to the wherein maximum operating voltage of a DC-DC converter.Fig. 3 shows the potential connected mode that can improve maximum operation voltage, the series connection of the input of DC-DC converter 1 and DC-DC converter 2, and the output parallel connection.
In fact, this mode of Fig. 3 can not work.The converter that the DC-DC converter 2 of the numeral DC-DC converter 1 of 1 indication and digital 2 indications be same model, but that the conversion efficiency of DC-DC converter 1 and DC-DC converter 2 is difficult to accomplish is equal, and its output voltage also can't be accomplished definitely equal.If the output voltage of DC-DC converter 1 omits height a bit, so, during real work, the output voltage of DC-DC converter 2 is forced to raise by DC-DC converter 1, DC-DC converter 2 can be by the Voltage Feedback ring of oneself, reduced the duty ratio of the master power switch pipe of self input, make circuit working own in light condition, its input current can be very little, its equivalent input impedance is very large, and the input current of DC-DC converter 1 can be very large, its input impedance of equivalence is very little, at this moment just there will be the input voltage of two converters all to press, the input voltage of DC-DC converter 2 is very high, and the input voltage of DC-DC converter 1 is very low, actual measurement is low to moderate between 1.5V to 4.5V, their input voltage sum is that Vin+ is to the voltage between Vin-.Because their input is series relationship, its input current must equate, this formula working method that pins down finally makes Fig. 3 circuit to work, and can export because converter wherein is operated in final plant closure under light condition, causes this series-connection power supplies mode of Fig. 3 repeatedly to restart.Another kind of situation is, the input voltage of DC-DC converter 1 is but very low, can be more and more lower, until the master power switch pipe of DC-DC converter 1 is in normally on, at this moment the voltage of input voltage vin almost all is added on DC-DC converter 2, only have 2 normal operations of DC-DC converter, can't increase power output, can't realize the beneficial effect of input series connection, output parallel connection.
Although be easy to expect the scheme of Fig. 3, DC-DC converter 1 and DC-DC converter 2 is difficult to guarantee the consistency of height, can't work, so this scheme is not disclosed, and be a kind of " potential connected mode " thus.
In prior art, use two Switching Power Supply input series connection, and the output parallel connection also can not find a kind of mode and allows the power supply of this series system work.
Summary of the invention
Have in view of that, the present invention will solve two Switching Power Supply input series connection in prior art, and the output parallel connection can not be worked, a kind of electric supply installation that can realize is provided, make two series connection of Switching Power Supply input, output parallel connections to work, circuit topology is simple, easily realize with practical, and the input service upper voltage limit is improved.
The object of the present invention is achieved like this, a kind of electric supply installation of realizing Switching Power Supply input series connection, output-parallel, comprise a DC-DC converter, the 2nd DC-DC converter, the pass connected is, the positive input of the one DC-DC converter connects operate outside power positive end, and the negative input of a DC-DC converter connects the positive input of the 2nd DC-DC converter, and the negative input of the 2nd DC-DC converter connects operate outside power-terminal; The positive output of the one DC-DC converter connects the positive output of the 2nd DC-DC converter, and the negative output of a DC-DC converter connects the negative output of the 2nd DC-DC converter, and its characteristic is: a push-pull converter that the DC-DC converter is operate in open loop state wherein; The converter that another DC-DC converter is closed loop work and output voltage stabilization.
Preferably, the push-pull converter of described operate in open loop state is self-excited push-pull type transducer.
Preferably, the push-pull converter of described operate in open loop state is the separate excitation push-pull converter.
Preferably, the converter of described closed loop work and output voltage stabilization is inverse excitation type converter.
Preferably, the converter of described closed loop work and output voltage stabilization is forward converter.
As the improvement of such scheme, the output of the push-pull converter of operate in open loop state arranges an output voltage more, utilizes its control circuit of secondary to the converter of closed loop work and output voltage stabilization power supply.In this improvement project, the converter using secondary control mode of closed loop work and output voltage stabilization realizes Switching Power Supply.
Operation principle of the present invention is:
Above-mentioned technical scheme its in essence, in the circuit shown in Fig. 3, the one DC-DC converter changes the push-pull converter of an operate in open loop state into, operate in open loop state, it is not voltage stabilizing of output voltage, along with the raising of its input service voltage, its output voltage is proportional raising linearly also, and the 2nd DC-DC converter is converter closed loop work, output voltage stabilization.
While powering on first, the output voltage of the one DC-DC converter and the 2nd DC-DC converter is all zero, they all can start voluntarily by the sequential of oneself, if output voltage is lower than the rated output voltage of the 2nd DC-DC converter, so, at this moment, the feedback loop of the 2nd DC-DC converter can strengthen the work duty ratio of main power tube in the 2nd DC-DC converter, the large electric current of input consumption that is equivalent to the 2nd DC-DC converter, because their input is series relationship, its input current must equate, at this moment the dividing potential drop that the input of a DC-DC converter obtains can become large, because a DC-DC converter is operate in open loop state, its output voltage also can improve, finally accurately be stabilized on the rated output voltage of the 2nd DC-DC converter.
If certain reason makes output voltage more higher, the feedback loop of the 2nd DC-DC converter can reduce the work duty ratio of main power tube in the 2nd DC-DC converter, the electric current that is equivalent to the input consumption of the 2nd DC-DC converter reduces, the input equivalence resistance out that is equal to the 2nd DC-DC converter strengthens, at this moment the dividing potential drop that the input of a DC-DC converter obtains can reduce, its output voltage also can reduce, and finally accurately is stabilized on the rated output voltage of the 2nd DC-DC converter.
When output voltage changes, the 2nd DC-DC converter utilizes the characteristics of its closed loop work, regulated the input of the 2nd DC-DC converter, the adjuster that is equivalent to a variable internal resistance, automatically regulate the voltage that is added to a DC-DC converter input, make the output voltage of a DC-DC converter of operate in open loop state accurately remain on the rated output voltage of the 2nd DC-DC converter.
The present invention can derive transfer function of the present invention with mathematical way in an embodiment in more detail, can realize goal of the invention as the present invention, and obtain the proof of good beneficial effect simultaneously.
In the present invention, because a DC-DC converter wherein is operate in open loop state, its frequency response is fine, conversion efficiency is high, cost is low, and the 2nd DC-DC converter is by above-mentioned analysis, no matter it is any topology, as long as energy regulated output voltage, just can connect with the input of a DC-DC converter, and output-parallel, this mode has been stablized the output voltage of a DC-DC converter of operate in open loop state, utilize again DC-DC converter characteristics cheaply, expanded the power output of the 2nd DC-DC converter.Beneficial effect of the present invention is:
1, obvious, maximum operating voltage of the present invention is improved;
2,, due to the push-pull converter that has used operate in open loop state, the loop response of switch electric supply installation circuit provided by the invention is good;
3, due to the push-pull converter that has used operate in open loop state, its cost is low, and efficiency is high, and the total cost of switch electric supply installation provided by the invention is better than the original converter cost by two same model;
4, apparent, a DC-DC converter and the 2nd DC-DC converter have used the input series connection, the output parallel connection, and centre does not arrange equalizing control circuit, realizes easily, without the converter circuit redesigned wherein.
The accompanying drawing explanation
Fig. 1 is common switch power parallel work electrical schematic diagram in prior art;
Fig. 2 is a kind of switch power parallel scheme that prior art is utilized redundant technique;
Fig. 3 is the potential scheme schematic diagram of realizing Switching Power Supply input series connection, output-parallel, is also the prototype of technical solution of the present invention;
Fig. 4 is the selected Royer circuit diagram of a DC-DC converter in the first embodiment;
The principle analysis figure of Fig. 5 first embodiment of the invention;
Fig. 6 is the selected gloomy circuit diagram of well of a DC-DC converter in the second embodiment;
The circuit block diagram that Fig. 7 is the 3rd embodiment.
Embodiment
The first embodiment
Fig. 3 shows the theory diagram of the first embodiment, adopts the electric supply installation in technique scheme, comprises two DC-DC converters.In Fig. 3, digital 1 indication is a DC-DC converter, in Fig. 3, digital 2 indications are the 2nd DC-DC converter, its input series connection, the output parallel connection, annexation is, the positive input of the one DC-DC converter 1 connects the sub-Vin+ of operate outside power positive end, and the negative input of a DC-DC converter 1 connects the positive input of the 2nd DC-DC converter 2, and the negative input of the 2nd DC-DC converter 2 connects operate outside power-terminal Vin-; The positive output of the one DC-DC converter 1 connects the positive output of the 2nd DC-DC converter, forms final output end vo ut+, and the negative output of a DC-DC converter 1 connects the negative output of the 2nd DC-DC converter, forms final output end vo ut-.
The push-pull converter that the one DC-DC converter 1 is operate in open loop state, embodiment mono-has selected famous ROYER circuit, existing self-excited push-pull type transducer, circuit structure is from the self-oscillation push-pull transistor single phase transformer DC converter of nineteen fifty-five U.S. Luo Ye (G.H.Royer) invention, this is also the beginning of realizing the high frequency conversion control circuit, self-excited push-pull type transducer has description in " principle of Switching Power Supply and the design " the 67th page to 70 pages of Electronic Industry Press, this book ISBN 7-121-00211-6.The principal mode of circuit is above-mentioned famous Royer circuit and self-oscillation Jensen circuit.Fig. 4 shows the schematic diagram of a DC-DC converter 1, has directly selected the product of the B1205M-1W of domestic MORNSUN brand here.Its input voltage is level pressure 12V, is output as 5V, and output current is 200mA.Market price is 10 yuan of left and right.
The 2nd DC-DC converter 2 has directly been selected the product of the WRF1205CKS-1W of domestic MORNSUN brand here.Its input voltage is 9V to 18V, is output as 5V, and output current is 200mA.Market price is 35 yuan of left and right.The schematic diagram of the 2nd DC-DC converter 2 is referring to the mandate textual description book accompanying drawing 4 of Chinese Granted publication 101997423A " a kind of self-oscillation flyback converter with the output short circuit protection function ".
For the convenient principle analysis to embodiment mono-, the circuit prototype shown in Fig. 3 is marked, as shown in Figure 5, wherein, operate outside voltage is U
in, the operating voltage of a DC-DC converter 1 is U
1, the operating voltage of the 2nd DC-DC converter 2 is U
2, the conversion efficiency of a DC-DC converter 1 is η
1, the conversion efficiency of the 2nd DC-DC converter 2 is η
2, the output current of a DC-DC converter 1 is I
1, the output current of the 2nd DC-DC converter 2 is I
2, the output voltage of the 2nd DC-DC converter 2 is U
0, because a DC-DC converter 1 is operate in open loop state, it also exists voltage change ratio k, i.e. a U
0=kU
1, have so:
Above formula (1) can be reduced to:
Above formula (2), in wushu, the part of the right minus sign moves to the left side and carries out the equation conversion again, can further be reduced to:
In Fig. 5, flow through load R
lelectric current be I
0, electric current I
0for electric current I
1and electric current I
2sum, above formula has clearly been expressed, and the present invention realizes the method and apparatus of Switching Power Supply input series connection, output-parallel, and realize that the essence of output voltage stabilizing is: two different converters are realized by the value of regulating its output current.
After above-mentioned connecting, actual measurement Vin operating voltage is between 21V to 30V, and first embodiment of the invention can works fine, is output as 5V, and output current is 400mA, and maximum output current is 800mA.
When operate outside voltage Vin is 23.7V, electronic load skips to 20mA from 200mA, hop period is 1KHz, the actual measurement overshoot amplitude is 2.83%, be 0.92uS recovery time, and, with the product of the WRF2405CKS-2W of brand, under same condition be: the actual measurement overshoot amplitude is 4.88%, is similarly 0.92uS recovery time.
No matter be theory analysis, or actual test, the present invention has realized previously described beneficial effect.And, clearly, above-mentioned two converter transpositions are equally realized to goal of the invention.
The second embodiment
The second embodiment still adopts the circuit shown in Fig. 3 or Fig. 5, the place different from the first embodiment, and digital 1 indication is that a DC-DC converter changes the gloomy circuit of well into, the 2nd DC-DC converter 2 changes the converter circuit of forward topology into.
Fig. 3 shows the theory diagram of the second embodiment, adopt the method in technique scheme, comprise two DC-DC converters, in Fig. 3, digital 1 indication is a DC-DC converter, in Fig. 3, digital 2 indications are the 2nd DC-DC converter, its input series connection, the output parallel connection, annexation is, the positive input of the one DC-DC converter 1 connects the sub-Vin+ of operate outside power positive end, the negative input of the one DC-DC converter 1 connects the positive input of the 2nd DC-DC converter 2, and the negative input of the 2nd DC-DC converter 2 connects operate outside power-terminal Vin-; The positive output of the one DC-DC converter 1 connects the positive output of the 2nd DC-DC converter, forms final output end vo ut+, and the negative output of a DC-DC converter 1 connects the negative output of the 2nd DC-DC converter, forms final output end vo ut-.
The push-pull converter that the one DC-DC converter 1 is operate in open loop state, embodiment bis-has selected the gloomy circuit of famous well.Existing self-excited push-pull type transducer, except above-mentioned Royer circuit, partial circuit is from gloomy (the Jen Sen of nineteen fifty-seven U.S.'s well, the some places translations " are looked into match ") invention auto-excitation type recommend the dual transformer circuit, after be called as self-oscillation Jensen circuit, these two kinds of circuit, the descendant is referred to as self-excited push-pull type transducer.Its operation principle also has description previously described " principle of Switching Power Supply and design " the 67th page to 70 pages, Fig. 6 shows the schematic diagram of a DC-DC converter 1 in the second embodiment, has directly selected the product of the B4812S-15W of domestic MORNSUN brand here.Its input voltage is level pressure 48V, is output as 12V, and output current is 1.25A, and its conversion efficiency is 94.4%, and circuit cost is 12 yuan of left and right.
The 2nd DC-DC converter 2 has directly been selected the product of the VRB4812LD-15W of domestic MORNSUN brand here.Its input voltage is 36V to 75V, is output as 12V, and output current is 1.25A.Circuit is the forward converter built with UC3843, and its conversion efficiency actual measurement is 89.9%, and circuit cost is about 35 yuan of left and right.The forward converter circuit diagram that the schematic diagram of the 2nd DC-DC converter 2 is recommended referring to this sheet integrated circuit of UC3843 self.
After above-mentioned connecting, actual measurement Vin operating voltage is between 84V to 123V, all high than the operating voltage of an original wherein converter, and second embodiment of the invention can works fine, is output as 12V, and output current is 2.5A, and maximum output current is 4A.
When operate outside voltage Vin is 96V, electronic load skips to 25mA from 2.5A, hop period is 1KHz, the actual measurement overshoot amplitude is 2.74%, and be 0.62uS recovery time, and with the product of the VRB4812LD-30W of brand, under same condition, be: the actual measurement overshoot amplitude is 4.69%, be 0.63uS recovery time, the electric supply installation that utilizes method of the present invention to obtain, and its conversion efficiency is 92.15%.
No matter be theory analysis, or actual test, the present invention has realized previously described beneficial effect.
In fact, transformer B2 in Fig. 6 being changed to a slice push-pull signal and occurring to use integrated circuit, is that the change device is recommended in 200910142976.1 disclosed open loop type separate excitations as a DC-DC converter 1 is changed to Chinese application number, realizes equally goal of the invention.The 2nd DC-DC converter 2 is changed to the circuit topologies such as asymmetrical half-bridge, flyback quasi-resonance, all can realize goal of the invention.Clearly, above-mentioned two converter transpositions are equally realized to goal of the invention.
Adopt this mode can also obtain a new working method, the output of the one DC-DC converter 1 arranges an output voltage more, utilize its power supply of secondary control circuit to the 2nd DC-DC converter 2, such the 2nd DC-DC converter 2 can adopt the secondary control mode to realize Switching Power Supply, as everyone knows, Switching Power Supply adopts the secondary control mode to be easy to realize synchronous rectification, and owing to being secondary control, there do not is the transmission delay of optocoupler, the loop response of power supply can be done very highly, output filter capacitor can adopt less capacity to realize like this, shown in the 3rd embodiment is exactly the sort circuit structure.
The 3rd embodiment
The 3rd embodiment adopts the circuit shown in Fig. 7, numeral 1 indication is a DC-DC converter, the place different from the second embodiment, its output dc voltage Duo Liao mono-tunnel, be with the square frame of digital 4 indications in Fig. 7, the output of box indicating rectification and filter circuit, the 2nd DC-DC converter 2 changes the converter circuit of the forward topology of secondary control into.
Fig. 7 circuit block diagram comprises two DC-DC converters, numeral 1 indication is a DC-DC converter, numeral 2 indications are the 2nd DC-DC converter, its input series connection, the output parallel connection, the pass of connection is that the positive input of a DC-DC converter 1 connects the sub-Vin+ of operate outside power positive end, the negative input of the one DC-DC converter 1 connects the positive input of the 2nd DC-DC converter 2, and the negative input of the 2nd DC-DC converter 2 connects operate outside power-terminal Vin-; First group of output (digital 3 indications) positive output of the one DC-DC converter 1 connects the positive output of the output circuit (digital 5 indications) of the 2nd DC-DC converter, form final output end vo ut+, the negative output of the one DC-DC converter 1 connects the negative output of the 2nd DC-DC converter output circuit (digital 5 indications), form final output end vo ut-, second group of output (digital 4 indications) output voltage of a DC-DC converter 1 is powered to the secondary control circuit in the output circuit (digital 5 indications) of the 2nd DC-DC converter 2.
In order to work, in the input parallel connection of the 2nd DC-DC converter 2 resistance, certainly, a voltage-stabiliser tube also is fine, like this when powering on, because the 2nd DC-DC converter 2 is controlled for secondary, its former limit power stage circuit is not worked because the secondary control circuit is not powered, at this moment a DC-DC converter 1 is by above-mentioned resistance or voltage-stabiliser tube power supply, output voltage is lower, but be enough to start the secondary control circuit, the 2nd DC-DC converter 2 normal operations, the secondary control circuit can rely on self powers and works, as described above, Switching Power Supply adopts the secondary control mode to be easy to realize synchronous rectification, and owing to being secondary control, there do not is the transmission delay of optocoupler, the loop response of power supply can be done very highly, output filter capacitor can adopt less capacity to realize like this, owing to can not using electrochemical capacitor as output filtering, more miniaturization of the volume of power supply like this, power density is higher, reliability is higher.
The push-pull converter that the one DC-DC converter 1 is operate in open loop state; Select equally the gloomy circuit of famous well with embodiment bis-, directly selected the product of the B4812S-15W of domestic MORNSUN brand.Its input voltage is level pressure 48V, is output as 12V, and output current is 1.25A, and its conversion efficiency is 94.4%.
The 2nd DC-DC converter 2 has directly been selected the product of the VRB4812LD-15W of domestic MORNSUN brand here.Its input voltage is 36V to 75V, is output as 12V, and output current is 1.25A.Circuit is the forward converter built with UC3843, and be adapted as the secondary control mode, and its conversion efficiency is promoted to 92.3%, and circuit has increased an isolation drive transformer, and in the input parallel connection resistance, resistance is 3.3K, when circuit works, and manual this resistance that disconnects, certainly, can use the secondary control circuit, adopt light-coupled isolation, with triode, disconnect this resistance.Circuit cost is about 38 yuan of left and right.
After above-mentioned connecting, actual measurement Vin operating voltage is between 84V to 123V, all high than the operating voltage of an original wherein converter, and third embodiment of the invention can works fine, is output as 12V, and output current is 2.5A, and maximum output current is 4A.
When operate outside voltage Vin is 96V, electronic load skips to 25mA from 2.5A, hop period is 1KHz, the actual measurement overshoot amplitude is 0.95%, and be 0.12uS recovery time, and with the product of the VRB4812LD-30W of brand, under same condition: the actual measurement overshoot amplitude is 4.69%, be 0.63uS recovery time, the electric supply installation that utilizes method of the present invention to obtain, and its conversion efficiency also rises to 93.2%.Shorten to 0.12uS recovery time, this is because the loop response of power supply can be done to obtain high causing very, also because so, can not use electrochemical capacitor as output filtering, use SMD ceramic disc capacitor as output filter capacitor, due to a DC-DC converter 1 push-pull converter that is operate in open loop state, because be operate in open loop state, Fig. 4, in Fig. 6, the secondary winding NS of transformer B1 is output as square wave, waveform through diode D1 and D2 output has been approximately direct current, filter capacitor itself is just very little, both combine, the electric supply installation that adopts method of the present invention to obtain like this, the more miniaturization of its volume, power density is higher, reliability is higher.
Clearly, above-mentioned two converter transpositions, still by converter secondary control circuit to the another converter when opening machine of operate in open loop state, powered, equally realize goal of the invention.
It is only below the preferred embodiment of the present invention; it should be noted that; above-mentioned preferred implementation should not be considered as limitation of the present invention; for those skilled in the art; without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention; here no longer with embodiment, repeat, protection scope of the present invention should be as the criterion with the claim limited range.
Claims (6)
1. realize that the Switching Power Supply input is connected, the electric supply installation of output-parallel for one kind, comprise a DC-DC converter, the 2nd DC-DC converter, the pass connected is, the positive input of a described DC-DC converter connects operate outside power positive end, the negative input of a described DC-DC converter connects the positive input of described the 2nd DC-DC converter, and the negative input of described the 2nd DC-DC converter connects described operate outside power-terminal; The positive output of a described DC-DC converter connects the positive output of described the 2nd DC-DC converter, the negative output of a described DC-DC converter connects the negative output of described the 2nd DC-DC converter, its characteristic is: a described DC-DC converter and described the 2nd DC-DC converter, be operate in open loop state push-pull converter, a converter that another is closed loop work and output voltage stabilization wherein.
2. electric supply installation according to claim 1, it is characterized in that: the push-pull converter of described operate in open loop state is self-excited push-pull type transducer.
3. electric supply installation according to claim 1, it is characterized in that: the push-pull converter of described operate in open loop state is the separate excitation push-pull converter.
4. electric supply installation according to claim 1, it is characterized in that: the converter of described closed loop work and output voltage stabilization is inverse excitation type converter.
5. electric supply installation according to claim 1, it is characterized in that: the converter of described closed loop work and output voltage stabilization is forward converter.
6. according to the arbitrary described electric supply installation of claim 1 to 5, it is characterized in that: the output of the push-pull converter of described operate in open loop state arranges an output voltage more, the secondary control circuit power supply of this output voltage to the converter of described closed loop work and output voltage stabilization.
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Cited By (7)
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| CN106130355A (en) * | 2016-08-12 | 2016-11-16 | 广州金升阳科技有限公司 | The transistor driving control method of push-pull converter and controller |
| CN107546959A (en) * | 2016-06-23 | 2018-01-05 | 中兴通讯股份有限公司 | A kind of Switching Power Supply, electronic equipment and Switching Power Supply control method |
| CN109738678A (en) * | 2019-03-22 | 2019-05-10 | 广东电网有限责任公司 | A kind of voltage dip generating unit and voltage dip generator |
| CN110506383A (en) * | 2017-04-19 | 2019-11-26 | 罗伯特·博世有限公司 | Control the isolation DC/DC converter of the power flow between three DC terminals |
| CN111092550A (en) * | 2019-12-25 | 2020-05-01 | 固德威电源科技(广德)有限公司 | Multi-path non-isolated DC/DC input open-circuit discharge control method |
| CN111431415A (en) * | 2020-04-13 | 2020-07-17 | 南京理工大学 | High-boost isolated DC converter with parallel input and series output |
| CN112187056A (en) * | 2019-07-04 | 2021-01-05 | 胜美达集团株式会社 | Power supply system and DC-DC converter |
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