CN104660040A - Buck power supply for implementing auxiliary output through self-coupling coil - Google Patents
Buck power supply for implementing auxiliary output through self-coupling coil Download PDFInfo
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- CN104660040A CN104660040A CN201310601843.2A CN201310601843A CN104660040A CN 104660040 A CN104660040 A CN 104660040A CN 201310601843 A CN201310601843 A CN 201310601843A CN 104660040 A CN104660040 A CN 104660040A
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Abstract
The invention discloses a buck-type switch power circuit with auxiliary power output. The buck-type switch power circuit with the auxiliary power output comprises a buck-type switch power circuit as a main output of the power circuit, and an auxiliary flyback power circuit which is controlled by the main output and is self-coupled and boosted by an inductor of the main output, wherein the buck-type switch power circuit as the main output consists of a rectifying switch tube, a freewheel diode, an energy storage inductor, a filter circuit, a partial voltage sampling resistor and a control circuit; in order to achieve an aim of outputting auxiliary power, the energy storage inductor in the buck-type switch power supply adopts an intermediate tapping implementation way, an auxiliary flyback power supply which is not isolated from the main output can be achieved, and most of energy output by the switch power supply is required to be output by the buck-type power circuit; the auxiliary flyback power supply consists of a rectifying diode, an energy storage inductor and a filter circuit; an auxiliary output voltage value can be adjusted by the turns ratio of a self-coupling coil; the auxiliary flyback power supply is formed by using the energy storage inductor of the main output as a basis, and then forming a coil through winding, so that the winding difficulty of a transformer can be reduced and the cost can be reduced; the auxiliary flyback power supply is formed on the basis of the buck-type switch power supply, so that the relative cost of the power circuit is reduced.
Description
Technical field
What the present invention relates to is a kind of circuit of switch power technology field, specifically refer to the lower switching power circuit needing again multiple-channel output of a kind of relative cost, particularly relate to a kind of main output using buck type Switching Power Supply as power circuit, realize energy storage inductor in tapped mode, export to realize auxiliary flyback sourse circuit with the coil of main output energy storage inductor self coupling.
Background technology
Buck type Switching Power Supply is a kind of conventional transformation of electrical energy method in modern power electronics technology, be mainly used in computer, fine measuring instrument, communication system contour performance DC-DC direct current open loop power supply, he is a kind of important method in modern transformation of electrical energy, has that relative cost is lower, the simple feature of circuit structure.
In current Switching Power Supply topology, the DC power supply that positive activation type circuit, reverse excitation circuit, push-pull circuit, half-bridge circuit, full-bridge circuit can realize multichannel exports, but the relative cost of this several circuit is higher.Although use buck type switching power circuit cost lower, be difficult to the accessory power supply realizing multiple-channel output.
The technology adopting self coupling to boost in switching power circuit can avoid the size of the coupling inductance that transformer type booster power supply circuit is larger, reduce relative cost, also L-C manifold type or switched capacitances switching power circuit can be avoided to affect larger problem by parasitic parameter simultaneously, improve the efficiency of switching power circuit.The switching power circuit of this inverse-excitation type has that structure is simple, volume is little, the rate of pressure rise is fast and step-up ratio large, copper loss and the advantage such as iron loss is few, leakage field is few.But this circuit is difficult to realize on the basis of buck type switching power circuit equally.
Summary of the invention
The invention provides and a kind ofly realize by self coupling coil the buck type switching power circuit that accessory power supply exports, the problem that higher and existing buck type switching power circuit is difficult to provide multiple power supplies to export and can not realize boost type and converts with the general relative cost of switching power circuit solving the switching power circuit of existing multiple-channel output and boost type conversion.
The invention provides a kind of buck type switching power circuit with auxiliary output, comprise as the main output of power circuit buck type switching power circuit and by main export control and with its altogether on primary outlet cycle basis plinth by reverse exciting switching voltage regulator circuit that self coupling boosting mode realizes.
Wherein, buck type switching power circuit comprises input filter capacitor C2, rectifier switch pipe Q1, sustained diode 1, output filter capacitor C1, energy storage inductor, control circuit, dividing potential drop sampling resistor R1 and R2, and described energy storage inductor is realized by tapped inductance.Rectifier switch pipe Q1 connects with output voltage Vo1, its ON time and the ratio of switch periods, determine the size of output voltage Vo1, the voltage of control circuit by sampling resistor R2 gets, the ratio of adjustment Q1 ON time and switch periods, thus stablize the output of Vo1.Sustained diode 1 is responsible for keeping having lasting electric current to pass through in power circuit when rectifier switch pipe turns off, and in addition, it is also responsible for the current potential of the drain electrode of clamper rectifier switch pipe, and then prevents rectifier switch pipe from being burnt.Control circuit comprises the parts such as error amplifier, PWM comparator, current amplifier, low voltage starting control.
Export the auxiliary reverse exciting switching voltage regulator circuit of connecting with main, comprise input filter capacitor C2, energy storage inductor, rectifier diode D2, output filter capacitor C3, control circuit and main output circuit share.The voltage commutation that coupling inductance exports by rectifier diode D2 and output filter capacitor C3, obtains the auxiliary power circuit with main output common ground.
As a further improvement on the present invention, described energy storage inductor is tapped inductance.
The invention has the beneficial effects as follows: pass through such scheme, the main of power circuit exports the buck type circuit adopted, ensureing, on the basis that relative cost is lower, the energy storage inductor in common buck type topology to be changed into tapped inductance, achieves and export the flyback electric source topology of connecting with main.Circuit structure is simple, components and parts consumption is few, can be applied to and need multiple-channel output and situation cost being had to requirement.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other occupation mode can also be obtained according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is one of the present invention and realizes by self coupling coil the circuit diagram of buck type Switching Power Supply embodiment 1 that accessory power supply exports;
Fig. 2 is the circuit diagram of a buck type Switching Power Supply embodiment 2 exported with multichannel self coupling boosting flyback of the present invention;
Fig. 3 is a circuit diagram by the embodiment 3 of magnetic coupling realization feedback of the present invention.
Embodiment
Clearly understand for making the object, technical solutions and advantages of the present invention, below in conjunction with embodiment of the present invention accompanying drawing, description clear, complete is further done to the technical scheme in the embodiment of the present invention, obviously, described embodiment is the one of the embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is a circuit diagram with the buck type switching power circuit embodiment of auxiliary output of the present invention, as shown in Figure 1, this circuit comprise as the main output of power circuit buck type switching power circuit and by main export control with main exports the self coupling of connecting boost assist flyback sourse circuit.
Concrete, main output buck type switching power circuit, by the make-and-break time of the feedback voltage signal control switch pipe Q1 from output extraction, can be divided into two stages by the course of work.
During switching tube Q1 conducting, during switch conduction, input voltage is added on the LC filter circuit that is made up of N1 section and the output capacitance C1 of energy storage inductor, and the electric current in energy storage inductor N1 section linearly rises with fixed slope, and the voltage being added in N1 section two ends is Vin-Vo1.In this process, an energy part for input is used for exporting, and a part is stored in above the N1 section of energy storage inductor.Current loop comprises the anode of input voltage, switching tube Q1, the N1 section of energy storage inductor, load.
When the switches are opened, because the magnetic flux in inductance coil can not suddenly change, the N1 section electric current of centre tap inductance is by sustained diode 1 afterflow, and achieve the afterflow to originally flowing through switching tube electric current, the electric current in inductance declines with fixed slope.Now, the current potential of 1 port of energy storage inductor is clamped at the conduction voltage drop of a continued flow tube lower than earth potential, and the current potential of N1 section 2 port is stabilized in Vo1 by the pressure stabilization function of filter capacitor C1, so the voltage at N1 section two ends within the Q1 turn-off time is-0.4-Vo1.Meanwhile, the part energy in energy storage inductor discharges to load, and some energy transfers to the N2 section of energy storage inductor by magnetic-coupled mode.Freewheel current ring comprises: the N1 section of sustained diode 1, energy storage inductor, load.When switch again conducting time, sustained diode 1 turns off rapidly, and electric current flows through from input and switching tube Q1.
No matter Q1 disconnects or conducting, and the voltage signal that main output voltage Vo1 is returned by sampling feedback by control circuit adjusts, and does not rely on input voltage vin.
Suppose that the number of turn of energy storage inductor N1 section and N2 section coil is n1 and n2 respectively.
Controlled by main output and the reverse exciting switching voltage regulator circuit of series connection with it when switching tube Q1 conducting, the induced voltage at energy storage inductor N2 section two ends is (Vin-Vo1) * n2/n1, the voltage of energy storage inductor 2 port is Vo1, so the induced voltage of energy storage inductor 3 port is Vo1-(Vin-Vo1) * n2/n1.This magnitude of voltage is less than Vo1, is more less than Vo2, and now, rectifier diode D2 oppositely ends, and the N2 section of energy storage inductor does not have electric current to flow through, and current loop only comprises output filter capacitor C3 and load, and the electric flux be stored in electric capacity shifts to load.
Sustained diode 1 and rectifier diode D2 choose the Schottky diode of low conduction voltage drop, and its conduction voltage drop all remains on 0.4V in very wide current range.Like this, when switching tube Q1 turns off, the voltage be added in energy storage inductor self coupling coil N2 section is n2/n1 (Vo1+0.4), and 3 port voltages are just, be added in the voltage sum of energy storage inductor N1 and N2 section for (n2/n1+1) * (Vo1+0.4), through rectifier diode D2 rectification, filter capacitor C3 filtering, the boost voltage Vo2 of output is (n2/n1+1) * (Vo1+0.4)-0.4.Now, the loop of electric current process is: sustained diode 1, energy storage inductor (comprising N1 section and N2 section), rectifier diode D2, filter capacitor C3 and load.Meanwhile, be stored in Q1 turn on process before energy storage inductor N1 section energy some to transfer in the load of electric capacity C3 and auxiliary output circuit.
Because pressure drop during sustained diode 1 conducting with output current change, so Vo2 can exist certain voltage error, but can intercouple due to N1 and N2, so auxiliary output can be made to obtain different output voltages by changing turn ratio.It should be noted that, realized the Switching Power Supply of flyback by self coupling coil, the voltage Vo2 of output is inevitable higher than Vo1, by adjusting the turn ratio of coil, Vo2 also higher than input voltage vin, so just can achieve the object of boosting on the basis of buck type Switching Power Supply topology.
Also it should be noted that, when switching tube Q1 conducting, output voltage Vo2 relies on output filter capacitor C3 burning voltage, and when switching tube Q1 ends, the reference point of output voltage Vo2 is the negative terminal of fly-wheel diode, and voltage is-0.4V.So the voltage Vo1 that the voltage Vo2 that auxiliary power circuit exports exports with main power source is the same, does not all rely on input voltage vin.
Finally it should be noted that, above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that; It still can be modified to the technical scheme described in previous embodiment, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technical scheme.
Claims (8)
1. realized a buck type switching power circuit for accessory power supply output by centre tap inductance, it is characterized in that, it comprises as the buck type switching power circuit of main output and the flyback sourse circuit as accessory power supply output.
2., as claimed in claim 1 with the buck type switching power circuit of auxiliary output, it is characterized in that, the main output of power supply and auxiliary flyback export by realizing in the tapped mode of energy storage inductor.
3. as claimed in claim 1 as the buck type switching power circuit of the main output of power supply, it is characterized in that, comprise input filter capacitor C2, rectifier switch pipe Q1, sustained diode 1, output filter capacitor C1, voltage sample resistance R1 and R2, energy storage inductor, control circuit composition.Described energy storage inductor is tapped implementation, is divided into N1 and N2 two sections.
4. as claimed in claim 3 as the buck type switching power circuit of the main output of power supply, it is characterized in that, described rectifier switch pipe Q1 connects the positive pole of input voltage and 1 port of energy storage inductor respectively, 1 port of energy storage inductor is also connected with the negative electrode of sustained diode 1, the anode of fly-wheel diode is connected with the negative pole of input voltage, 2 ports of energy storage inductor are connected with output filter capacitor C1 and as the positive pole of main power source, and the other end of output filter capacitor C1 is connected with the anode of sustained diode 1 and as the earth point of main power source.The two ends of input filter capacitor C2 are connected on the both positive and negative polarity of input voltage.The positive pole of out-put supply separates leads up to divider resistance R1 and R2 ground connection, and the voltage that resistance R2 gets accesses power control circuit as feedback signal, controls conducting and the disconnection of rectifier switch pipe Q1.
5., as claimed in claim 1 as the auxiliary reverse exciting switching voltage regulator circuit exported, it is characterized in that, comprise self coupling coil, rectifier diode D2, output filter capacitor C3, input filter capacitor C2, rectifier switch pipe Q1 and control circuit.
6., as claimed in claim 5 as the auxiliary reverse exciting switching voltage regulator circuit exported, it is characterized in that, share rectifier switch pipe Q1, input filter capacitor C2 and control circuit with the buck type switching power circuit as the main output of power supply.3 ports of described self coupling coil connect the anode of rectifier diode D2, the negative electrode of rectifier diode D2 is connected with output filter capacitor C3 and as the positive pole of accessory power supply, 2 ports of this reverse exciting switching voltage regulator circuit self coupling coil connect together with the energy storage inductor of main output, realize the object of self coupling boosting, so the inevitable voltage exported higher than main power source of voltage that this road exports, the other end of output filter capacitor C3 is connected to the earth point of main output, as the earth point of this road reverse exciting switching voltage regulator circuit.
7. as claimed in claim 1 with the buck type switching power circuit of auxiliary output, it is characterized in that, described energy storage inductor realizes in tapped mode, and the energy storage inductor coil basis of the main output of power supply increases some coils, realizes the object of self coupling boosting.
8. as claimed in claim 1 with the buck type switching power circuit of auxiliary output, it is characterized in that, the magnitude of voltage that flyback accessory power supply exports can be regulated by the turn ratio of adjustment energy storage inductor two sections of N1 and N2, main output is the switching power circuit of a buck type, so the voltage Vo1 of main output is inevitable lower than input voltage vin, the auxiliary energy storage coil N2 of flyback sourse and the coil N1 of main output is self coupling relation, so the auxiliary voltage Vo2 exported is greater than Vo1, the turn ratio of adjustment coil, Vo2 both can be greater than input voltage vin, also input voltage vin can be less than.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310601843.2A CN104660040A (en) | 2013-11-26 | 2013-11-26 | Buck power supply for implementing auxiliary output through self-coupling coil |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310601843.2A CN104660040A (en) | 2013-11-26 | 2013-11-26 | Buck power supply for implementing auxiliary output through self-coupling coil |
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| CN104660040A true CN104660040A (en) | 2015-05-27 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453624A (en) * | 2017-07-26 | 2017-12-08 | 广州金升阳科技有限公司 | A kind of auxiliary power supply circuit |
| CN108599562A (en) * | 2018-06-25 | 2018-09-28 | 珠海格力电器股份有限公司 | Switching power circuit |
| CN108809105A (en) * | 2018-06-25 | 2018-11-13 | 珠海格力电器股份有限公司 | Switching power circuit |
| CN110045174A (en) * | 2019-05-24 | 2019-07-23 | 南京酷科电子科技有限公司 | A kind of current sampling circuit |
| CN110299842A (en) * | 2019-07-23 | 2019-10-01 | 东莞保力电子有限公司 | A kind of pressurization afterflow low voltage difference Buck type switching power unit |
| CN110380607A (en) * | 2019-07-19 | 2019-10-25 | 高宁 | A kind of two-way DC/DC circuit and its application for realizing multiple-channel output using coupling inductance |
| CN110829571A (en) * | 2018-08-09 | 2020-02-21 | 施耐德电气It公司 | High-efficiency flexible converter |
| TWI748777B (en) * | 2020-12-02 | 2021-12-01 | 遠東科技大學 | Dc power converter with step-up and step-down voltage conversion functions |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107453624A (en) * | 2017-07-26 | 2017-12-08 | 广州金升阳科技有限公司 | A kind of auxiliary power supply circuit |
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| CN110829571A (en) * | 2018-08-09 | 2020-02-21 | 施耐德电气It公司 | High-efficiency flexible converter |
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| CN110045174A (en) * | 2019-05-24 | 2019-07-23 | 南京酷科电子科技有限公司 | A kind of current sampling circuit |
| CN110380607A (en) * | 2019-07-19 | 2019-10-25 | 高宁 | A kind of two-way DC/DC circuit and its application for realizing multiple-channel output using coupling inductance |
| CN110299842A (en) * | 2019-07-23 | 2019-10-01 | 东莞保力电子有限公司 | A kind of pressurization afterflow low voltage difference Buck type switching power unit |
| CN110299842B (en) * | 2019-07-23 | 2024-02-13 | 东莞保力电子有限公司 | Boost freewheel low pressure differential Buck type switching power supply device |
| TWI748777B (en) * | 2020-12-02 | 2021-12-01 | 遠東科技大學 | Dc power converter with step-up and step-down voltage conversion functions |
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Application publication date: 20150527 |