CN104852611A - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN104852611A CN104852611A CN201510254152.9A CN201510254152A CN104852611A CN 104852611 A CN104852611 A CN 104852611A CN 201510254152 A CN201510254152 A CN 201510254152A CN 104852611 A CN104852611 A CN 104852611A
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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 invention discloses a switching power supply, which comprises a rectifier bridge, a first capacitor, a voltage-multiplying circuit, a second capacitor, a flyback converter, and a leakage inductance recovery circuit, wherein the rectifier bridge is provided with a positive output end and a negative output end; the first capacitor is in parallel connection between the positive output end and the negative output end of the rectifier bridge; the leakage inductance recovery circuit comprises a second diode; the cathode of the second diode is connected with the positive output end of the rectifier bridge; the anode of the second diode is connected with an unlike end of a primary winding; and when a first switching tube and a second switching tube are cut off, leakage inductance energy of a transformer is recovered to the first capacitor via the second diode. Compared with the prior art, the leakage inductance energy can be more effectively recovered and used, voltage stress of the switching tubes can be effectively controlled, no voltage spike exists between a drain and a source of the switching tube, and EMI performance of the system can be improved.
Description
Technical field
The present invention relates to a kind of power circuit, the circuit of particularly a kind of leakage inductance energy recovery of Switching Power Supply.
Background technology
The leakage inductance of transformer can be understood as the magnetic line of force that primary coil produces can not completely by secondary coil, and the inductance therefore producing leakage field is called leakage inductance.Defining us by this to know, all there is leakage inductance in any transformer, and particularly for Switching Power Supply, the leakage inductance of switch transformer affects particular importance to switch power source performance index.When the moment that control switch pipe disconnects, due to the existence of switch transformer leakage inductance, can produce the induced electromotive force of connecting with input voltage in leakage inductance, this inverse electromotive force is easy to very greatly a switching device over-voltage breakdown; And the energy of leakage inductance cannot be transferred to the secondary side of Switching Power Supply, cause the loss of energy and make overall efficiency low.
In flyback topologies circuit, the impact of leakage inductance is larger.As everyone knows, flyback transformer primary side and primary side are not real-time Transmission energy, flyback topologies structure as shown in Figure 1, when switching tube conducting, transformer primary inductance starts stored energy, when switching tube turns off, transformer is by the coupling of primary and secondary coil, and the Energy Coupling of primary coil is in secondary coil and be transferred to the output of Switching Power Supply.Therefore, flyback transformer has the process of a stored energy, and this just causes the DC component of transformer primary inductance very large, needs magnetic core to open air gap, thus causes leakage inductance larger.
Because the universal existence of leakage inductance, at present when carrying out Switching Power Supply design, generally adopting absorbing circuit this part leakage inductance to be lost, thus reducing the voltage stress of switching tube drain-source end.Although do the voltage stress that ensure that switching tube drain-source end like this, the energy of leakage inductance is also slatterning virtually.A kind of leakage inductance feedback circuit is also had to be called tertiary winding absorbing circuit, circuit is as shown in Figure 2 tertiary winding absorbing circuit, this circuit can meet the recycling of leakage inductance energy, but structure is comparatively complicated, particularly transformer is known clearly the 3rd winding more, adds device making technics complexity and cost.
As number of patent application " a kind of power circuit " the Chinese patent prospectus that is 201410822779.5 shows a kind of brand-new topology of Switching Power Supply, Fig. 3 illustrates the simple topology figure in patent " a kind of power circuit ", as shown in Figure 3, because magnetic core of transformer works in one or three quadrants of magnetic hysteresis loop, therefore the air gap of its magnetic core of transformer can reduce, thus reduction leakage inductance, but the loss of leakage inductance still exists.
Summary of the invention
The object of this invention is to provide a kind of circuit topology, the recovery problem of leakage inductance energy in prior art can be solved, improve the conversion efficiency of complete machine.In order to achieve the above object, the present invention is achieved through the following technical measures:
A kind of Switching Power Supply, comprise rectifier bridge, the first electric capacity, voltage-multiplying circuit, the second electric capacity and circuit of reversed excitation, described rectifier bridge has positive output end and negative output terminal, and described first Capacitance parallel connection is between the positive output end and negative output terminal of rectifier bridge; The former limit circuit of described circuit of reversed excitation comprises the former limit winding of transformer, the first switching tube and drives the driver module of the first switching tube; The output voltage of rectifier bridge raises by described voltage-multiplying circuit, comprise the first diode, the first inductance and second switch pipe, the positive output end of described rectifier bridge is connected with one end of the first inductance, the other end of the first inductance is connected with the anode of the first diode and the drain electrode of second switch pipe respectively, and the source electrode of second switch pipe is connected with the negative output terminal of rectifier bridge; The grid of second switch pipe is connected with driver module; The negative electrode of the first diode is connected with the drain electrode of the first switching tube and one end of the second electric capacity respectively, and the other end of the second electric capacity is connected with the different name end of former limit winding, and the Same Name of Ends of former limit winding is connected with the negative output terminal of rectifier bridge; The source electrode of the first switching tube is connected with the Same Name of Ends of former limit winding; The grid of the first switching tube is connected with driver module; Also comprise leakage inductance recovery circuit, described leakage inductance recovery circuit comprises the second diode, wherein, the negative electrode of the second diode is connected with the positive output end of rectifier bridge, the anode of the second diode is connected with the different name end of former limit winding, when the first switching tube and second switch pipe turn off, the leakage inductance energy of transformer is recovered in the first electric capacity through the second diode.
Improve as another kind of the present invention, described second switch Guan You tri-diode replaces, in described voltage-multiplying circuit, the other end of inductance is connected with the anode of the first diode and the negative electrode of the 3rd diode respectively, and the anode of the 3rd diode connects the negative output terminal of rectifier bridge.
Compared with prior art, the present invention has following beneficial effect:
(1) leakage inductance energy can effectively be recycled, and reduces the loss of power.
(2) voltage stress of switching tube can effectively be controlled, and makes the drain-source interpolar no-voltage spike of switching tube.
(3) the EMI performance of system is improved.
(4) cost is low, reduces component number.
Accompanying drawing explanation
Fig. 1 is existing common flyback topologies sketch;
Fig. 2 is the flyback topologies electrical block diagram that the existing tertiary winding absorbs;
The simple topology figure of Fig. 3 to be cited patent applications number be Chinese patent of 201410822779.5;
Fig. 4 is the simple topology component units schematic diagram of Switching Power Supply of the present invention;
Fig. 5 is that Switching Power Supply of the present invention analyzes schematic diagram at the current direction of N-MOS pipe conduction period;
Fig. 6 is that Switching Power Supply of the present invention analyzes schematic diagram at the current direction of N-MOS pipe blocking interval;
Fig. 7 is the circuit theory diagrams of the first embodiment of Switching Power Supply of the present invention;
Fig. 8 is the circuit theory diagrams of the second embodiment of Switching Power Supply of the present invention.
Embodiment
First embodiment
Single use text description principle, can allow the art personnel understand difficulty, so, please use principle figure be allow, coordinate signal conventional in electronic engineering to flow to and operation principle of the present invention is described.
Detailed circuit shown in Fig. 7 is the schematic diagram of the first embodiment of the present invention, comprises rectifier bridge, the first electric capacity C1, voltage-multiplying circuit, the second electric capacity C
dC, circuit of reversed excitation, leakage inductance energy feedback circuit; Described rectifier bridge becomes Rectified alternating current AC rectification, and the positive output end of rectifier bridge connects one end of the first electric capacity C1, and the other end of the first electric capacity C1 connects the negative output terminal of rectifier bridge; The output voltage of rectifier bridge raises by voltage-multiplying circuit, comprises the first diode D1, the first inductance L 1, second switch pipe Q2, and one end of its first inductance L 1 connects the positive output end of rectifier bridge, and the other end of the first inductance L 1 connects the anode of the first diode D1; The drain electrode of its second switch pipe Q2 is connected with the anode of the first diode D1, the source electrode of second switch pipe Q2 is connected to the negative output terminal of rectifier bridge, the negative electrode of the first diode D1 connects the drain electrode of the first switching tube Q1, and the source electrode of the first switching tube Q1 is connected to the negative output terminal of rectifier bridge; Second electric capacity C
dCone end connect the negative electrode of the first diode D1 in voltage-multiplying circuit, the second electric capacity C
dCthe other end connect the different name end on the former limit of transformer T1 in circuit of reversed excitation; First switching tube Q1 and second switch pipe Q2 uses same control signal; In leakage inductance energy feedback circuit, the negative electrode of the second diode D3 connects the positive output end of rectifier bridge, the different name end on the former limit of anode connection transformer of the second diode D3, and the Same Name of Ends of transformer T1 primary side is connected with the negative output terminal of rectifier bridge; The primary side different name end of transformer T1 and the 4th diode (output rectifier diode) D
oanode be connected, the 4th diode D
onegative electrode and the 3rd electric capacity (output filter capacitor) C
oone end be connected, as power supply export positive pole, the 3rd electric capacity (output filter capacitor) C
othe other end be connected with transformer secondary Same Name of Ends, as power supply export negative pole.
Operation principle of the present invention:
Fig. 4 is by above-mentioned technical scheme, and the simple topology component units schematic diagram drawn out, comprises rectifier bridge 101, voltage-multiplying circuit 102, drive circuit 103, circuit of reversed excitation 104, leakage inductance energy feedback circuit 105.Rectifier bridge 101 becomes Rectified alternating current AC rectification; Drive circuit 103 carries out Duty ratio control by some characteristic switch tube Q1 and Q2 of control circuit; Voltage-multiplying circuit 102 comprises diode D1, inductance L 1 and switching tube Q2, and by the energy stored during induction charging, then superposition input voltage is sent to the electric capacity C in circuit of reversed excitation 104
dCon; Leakage inductance energy feedback circuit 105 comprises diode D3, Absorption Capacitance C1; Circuit of reversed excitation 104 comprises bus capacitor C
dC, switching tube Q1, transformer, output rectifier diode Do, output filter capacitor.
Assuming that described switching tube Q1, Q2 is N-MOS pipe, all works with the inductance in voltage-multiplying circuit 103 and the transformer in circuit of reversed excitation and carry out principle explanation in a critical mode, then the operation principle of the present invention's one-period in the steady state:
(1) N-MOS pipe Q1 and Q2 conducting:
As N-MOS pipe Q1 and Q2 conducting, N-MOS pipe Q1 and Q2 is equivalent to a wire, Fig. 5 illustrates the flow direction of now electric current, from the negative output terminal of the switching tube Q2 the inductance L 1 → voltage-multiplying circuit 102 of the positive output end → voltage-multiplying circuit 102 of rectifier bridge 101 → get back to rectifier bridge 101, concrete current direction is as shown in dotted line in Fig. 5 301.In addition, main primary also has a current circuit, from bus capacitor C
dCthe bus capacitor C of the transformer primary side winding of the N-MOS pipe Q1 → circuit of reversed excitation 104 of positive pole → circuit of reversed excitation 104 → get back to circuit of reversed excitation 104
dCnegative pole, concrete current direction is as shown in dotted line in Fig. 5 302.Now transformer carries out stored energy, and power supply primary side relies on the electric energy stored in output capacitance Co, and concrete current direction is as shown in dotted line in Fig. 5 303.
In this process, the electric current flowing through inductance L 1 is started from scratch linear rising, and inductance L 1 starts energy storage; Bus capacitor simultaneously in circuit of reversed excitation is discharged to transformer primary side by N-MOS pipe Q1, the electric current of transformer T1 former limit winding is started from scratch and is linearly risen, the sense of current of transformer T1 former limit winding: flow to former limit different name end from former limit Same Name of Ends, and excitatory and by the former limit winding storage power of transformer T1 to the former limit winding of transformer T1; At this moment the vice-side winding of transformer T1 induces negative lower positive induced voltage, and as symbol logo in Fig. 5, this induced voltage and the turn ratio of transformer T1, former limit winding voltage are relevant, and under this voltage effect, diode Do is reverse-biased, not conducting.
(2) N-MOS pipe Q1 and Q2 turns off then:
When N-MOS pipe Q1 and Q2 conducting complete, when then turning off rapidly, now N-MOS pipe Q1 and Q2 is equivalent to open circuit, and Fig. 6 illustrates current direction now, the bus capacitor C from the diode D1 → circuit of reversed excitation the inductance L 1 → voltage-multiplying circuit 102 of the positive output end → voltage-multiplying circuit 102 of rectifier bridge 101
dCthe negative output terminal of the transformer primary side winding of → circuit of reversed excitation 104 → get back to rectifier bridge 101, concrete current direction is as shown in dotted line in Fig. 6 304.Now transformer carries out fault offset, the vice-side winding of transformer T1 induces just lower negative induced voltage, electric current from the different name end of transformer T1 vice-side winding flow out → rectifier diode Do through circuit of reversed excitation 104 → to load and output capacitance Co releases energy → gets back to the Same Name of Ends of transformer T1 vice-side winding, concrete current direction is as shown in the dotted line 305 in Fig. 6.Due to the existence of leakage inductance Ls, the Absorption Capacitance C1 → transformer primary side in the diode D3 → leakage inductance energy feedback circuit 105 of its leakage inductance energy stored in leakage inductance energy feedback circuit 105, concrete current direction is as shown in the dotted line 306 in Fig. 6.Switching tube Q1 and Q2 down periods, the energy that inductance L 1 in voltage-multiplying circuit 102 stores also by the path shown in dotted line 304 in Fig. 6 to the bus capacitor C in circuit of reversed excitation
dCcharge, now inductance induces left negative right positive induced voltage, and electric current flows out → D1 → bus capacitor C through voltage-multiplying circuit from the induced voltage anode of inductance
dCthe induced voltage negative terminal of the D3 in → leakage inductance energy feedback circuit → get back to inductance.
In this process, inductance L 1 in voltage-multiplying circuit 102 is due to current break, induce left negative right positive induced electromotive force, as symbol logo in Fig. 6, therefore can regard the induced electromotive force sum of rectifier bridge output voltage and inductance as to the bus capacitor C in circuit of reversed excitation 104
dCwith the former limit charging of transformer T1, now the winding current direction, former limit of transformer T1 is from former limit different name end to Same Name of Ends, therefore the vice-side winding of transformer T1 induces just lower negative induced voltage, as in Fig. 6, symbol represents.
The leakage inductance Ls of transformer T1 now induces just lower negative induced electromotive force, because impedance other loop comparatively in this topology of leakage inductance feedback loop is low, therefore leakage inductance energy major part feeds back in Absorption Capacitance C1, achieves the recycling of leakage inductance energy, improves efficiency.And, turn off at switching tube Q1, when leakage inductance energy passes through, transformer T1 different name terminal potential is clamped to inlet highway voltage by the second diode D3, therefore the due to voltage spikes caused by leakage inductance Ls is effectively absorbed, so time switching tube drain-source pole just there is no due to voltage spikes.Because leakage inductance energy absorbs in the first electric capacity completely, instead of form leakage inductance due to voltage spikes, therefore the present invention effectively reduces the disturbing source of Switching Power Supply, optimizes system EMI performance.
Simultaneously, because transformer T1 stores energy at N-MOS pipe Q1 turn on period, there is provided energy at N-MOS pipe Q1 blocking interval to load, be equivalent to the inductance in voltage-multiplying circuit 102 and the transformer in circuit of reversed excitation 104, at N-MOS pipe Q1 blocking interval simultaneously for load provides energy.Illustrate: if the Switching Power Supply of design 5W, so at N-MOS pipe Q1 blocking interval, inductance and transformer respectively can transmit the energy of 2.5W to secondary, therefore transformer T1 and inductance L 1 all the design standard of 2.5W can carry out setting parameter.
Controlling to realize overpower, under the source electrode of N-MOS pipe Q1, sealing in current sampling resistor, sampled signal is sent into drive circuit and control drive singal; In order to realize closed-loop control, sending into drive circuit at output sampling output voltage by feedback circuit, controlling the duty ratio of drive singal.It is 110VAC ~ 264VAC that circuit diagram shown in Fig. 7 is designed to input service voltage range, and output voltage is 15V, and power output is the voltage-stabilizing switch power source sample of 3W.Record the efficiency that the efficiency of inventive samples under different input voltage in fully loaded output situation and prior art sample record under the same conditions, both correction datas, as shown in table 1 below:
Table 1 existing scheme sample and inventive samples the fully loaded efficiency comparative exported under different input voltage show
| 110VAC input | 220VAC input | 264VAC input | |
| The delivery efficiency of existing scheme sample | 78.1％ | 76.25％ | 73.6％ |
| The delivery efficiency of the embodiment of the present invention one sample | 79.4％ | 77.2％ | 76.1％ |
Second embodiment
Circuit shown in Fig. 8 is the second embodiment of the present invention, its circuit structure is similar to the first embodiment of the present invention, their difference is: the second embodiment of the present invention changes the switching tube Q2 in the first embodiment into diode D4, and concrete connected mode is expressed as follows:
The secondary of embodiment two is identical with the first embodiment, the rectifier bridge on former limit is also identical with circuit of reversed excitation structure, therefore do not repeat them here, difference part-the voltage-multiplying circuit of main both elaborations, in voltage-multiplying circuit, one end of inductance connects the positive output end of rectifier bridge, in voltage-multiplying circuit, the other end of inductance connects the negative electrode of the 3rd diode D4, and connect the anode of the first diode D1, the anode of the 3rd diode D4 connects the negative output terminal of rectifier bridge, and the negative electrode of the first diode D1 connects drain electrode and the second electric capacity C of the first switching tube
dCone end, the second electric capacity C
dCthe other end be connected with the different name end of transformer primary side winding.
Assuming that components and parts are ideal component in described circuit, under being all operated in discontinuous mode with the inductance in voltage-multiplying circuit and the transformer in circuit of reversed excitation, carry out principle explanation, then the operation principle of one-period in the steady state:
(1) N-MOS pipe Q1 conducting:
When the Q1 conducting of N-MOS pipe, N-MOS pipe Q1 is equivalent to a wire, now the flow direction of electric current: from the negative output terminal of the switching tube Q1 in the diode D1 → voltage-multiplying circuit 103 the inductance L 1 → voltage-multiplying circuit 103 of the positive output end → voltage-multiplying circuit 103 of rectifier bridge 101 → get back to rectifier bridge 101.In addition, main primary also has a current circuit, from bus capacitor C
dCthe bus capacitor C of the transformer primary side winding of the N-MOS pipe Q1 → circuit of reversed excitation 104 of positive pole → circuit of reversed excitation 104 → get back to circuit of reversed excitation 104
dCnegative pole.Now transformer carries out stored energy, and power supply primary side relies on the electric energy stored in output capacitance Co.
In this process, the electric current flowing through inductance L 1 is started from scratch linear rising, and inductance L 1 starts energy storage; Bus capacitor simultaneously in circuit of reversed excitation is discharged to transformer primary side by N-MOS pipe Q1, the electric current of transformer T1 former limit winding is started from scratch and is linearly risen, the sense of current of transformer T1 former limit winding: flow to former limit different name end from former limit Same Name of Ends, and excitatory and by the former limit winding storage power of transformer T1 to the former limit winding of transformer T1; At this moment the vice-side winding of transformer T1 induces negative lower positive induced voltage, and this induced voltage and the turn ratio of transformer T1, former limit winding voltage are relevant, and under this voltage effect, diode Do is reverse-biased, not conducting.
(2) N-MOS pipe Q1 turns off then:
When N-MOS pipe Q1 conducting is complete, when then turning off rapidly, now N-MOS pipe Q1 is equivalent to open circuit, current direction now: the bus capacitor C from the diode D1 → circuit of reversed excitation the inductance L 1 → voltage-multiplying circuit 103 of the positive output end → voltage-multiplying circuit 103 of rectifier bridge 101
dCthe negative output terminal of the transformer primary side winding of → circuit of reversed excitation 104 → get back to rectifier bridge 101.Now transformer carries out fault offset, the vice-side winding of transformer T1 induces just lower negative induced voltage, electric current from the different name end of transformer T1 vice-side winding flow out → rectifier diode Do through circuit of reversed excitation 104 → to load and output capacitance Co releases energy → gets back to the Same Name of Ends of transformer T1 vice-side winding.
In this process, the inductance L 1 in voltage-multiplying circuit 103, due to current break, induces left negative right positive induced electromotive force, therefore can regard the induced electromotive force sum of rectifier bridge output voltage and inductance as to the bus capacitor C in circuit of reversed excitation 104
dCwith the former limit charging of transformer T1, now the winding current direction, former limit of transformer T1 is from former limit different name end to Same Name of Ends, therefore the vice-side winding of transformer T1 induces just lower negative induced voltage.
The leakage inductance Ls of transformer T1 now induces just lower negative induced electromotive force, because impedance other loop comparatively in this topology of leakage inductance feedback loop is low, therefore leakage inductance energy major part feeds back in Absorption Capacitance C1, achieves the recycling of leakage inductance energy, improves efficiency.
Simultaneously, because transformer T1 stores energy at N-MOS pipe Q1 turn on period, energy is provided to load at N-MOS pipe Q1 blocking interval, be equivalent to the inductance in voltage-multiplying circuit 103 and the transformer in circuit of reversed excitation 104, at N-MOS pipe Q1 blocking interval simultaneously for load provides energy, therefore design standard when transformer T1 and inductance L 1 work independently under all can being less than same power, this is that existing topology cannot be accomplished.After the fault offset of inductance and transformer, circuit just enters resonance condition, the diode D4 added is mainly by inductance, transformer separates with the resonant tank of the junction capacitance of diode, warp is 110VAC ~ 264VAC to input service voltage range, output voltage is 15V, power output is the sample one of the employing prior art of 3W and adopts the sample two of second embodiment of the invention scheme to test, draw the correction data of the efficiency that the efficiency of second embodiment of the invention sample under different input voltage in fully loaded output situation and prior art sample record under the same conditions, as shown in table 2 below:
Table 2 existing scheme sample and inventive samples the fully loaded efficiency comparative exported under different input voltage show
| 110VAC input | 220VAC input | 264VAC input | |
| The delivery efficiency of existing scheme sample | 77.6％ | 75.8％ | 74％ |
| The delivery efficiency of the embodiment of the present invention two | 79.92％ | 77.78％ | 76.32％ |
Below be only some embodiments of the present invention, it should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, embodiment can combined crosswise, and protection scope of the present invention should be as the criterion with claim limited range.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.
Claims (2)
1. a Switching Power Supply, comprise rectifier bridge, the first electric capacity, voltage-multiplying circuit, the second electric capacity and circuit of reversed excitation, described rectifier bridge has positive output end and negative output terminal, and described first Capacitance parallel connection is between the positive output end and negative output terminal of rectifier bridge; The former limit circuit of described circuit of reversed excitation comprises the former limit winding of transformer, the first switching tube and drives the driver module of the first switching tube; The output voltage of rectifier bridge raises by described voltage-multiplying circuit, comprise the first diode, the first inductance and second switch pipe, the positive output end of described rectifier bridge is connected with one end of the first inductance, the other end of the first inductance is connected with the anode of the first diode and the drain electrode of second switch pipe respectively, and the source electrode of second switch pipe is connected with the negative output terminal of rectifier bridge; The grid of second switch pipe is connected with driver module; The negative electrode of the first diode is connected with the drain electrode of the first switching tube and one end of the second electric capacity respectively, and the other end of the second electric capacity is connected with the different name end of former limit winding, and the Same Name of Ends of former limit winding is connected with the negative output terminal of rectifier bridge; The source electrode of the first switching tube is connected with the Same Name of Ends of former limit winding; The grid of the first switching tube is connected with driver module, it is characterized in that:
Also comprise leakage inductance recovery circuit, described leakage inductance recovery circuit comprises the second diode, and wherein, the negative electrode of the second diode is connected with the positive output end of rectifier bridge, and the anode of the second diode is connected with the different name end of former limit winding,
When the first switching tube and second switch pipe turn off, the leakage inductance energy of transformer is recovered in the first electric capacity through the second diode.
2. according to Switching Power Supply according to claim 1, it is characterized in that: described second switch Guan You tri-diode replaces, in described voltage-multiplying circuit, the other end of inductance is connected with the anode of the first diode and the negative electrode of the 3rd diode respectively, and the anode of the 3rd diode connects the negative output terminal of rectifier bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510254152.9A CN104852611A (en) | 2015-05-15 | 2015-05-15 | Switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510254152.9A CN104852611A (en) | 2015-05-15 | 2015-05-15 | Switching power supply |
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| CN104852611A true CN104852611A (en) | 2015-08-19 |
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| CN201510254152.9A Pending CN104852611A (en) | 2015-05-15 | 2015-05-15 | Switching power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186219A (en) * | 2016-08-25 | 2016-12-07 | 魔水科技（北京）有限公司 | Nuclear-magnetism sterilizing unit and method for sanitaryware |
| CN107026571A (en) * | 2016-12-26 | 2017-08-08 | 国网江西省电力公司电力科学研究院 | A kind of switching power unit |
| CN107094338A (en) * | 2017-06-30 | 2017-08-25 | 湖州灵感电子科技有限公司 | A kind of constant current driver circuit for LED |
| CN111384856A (en) * | 2018-12-28 | 2020-07-07 | 奇源科技有限公司 | Voltage circuit for electric shock of pests |
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| US20130343098A1 (en) * | 2012-06-21 | 2013-12-26 | Sunedison, Llc | Power Converters And Methods For Active Leakage Energy Recovery In A Power Converter |
| CN203775058U (en) * | 2014-03-26 | 2014-08-13 | 浙江駻捷新能源科技有限公司 | LED driving power supply based on single-end flyback transformer leakage inductor energy utilization |
| CN104578844A (en) * | 2014-12-22 | 2015-04-29 | 广州金升阳科技有限公司 | Switching mode power supply circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130343098A1 (en) * | 2012-06-21 | 2013-12-26 | Sunedison, Llc | Power Converters And Methods For Active Leakage Energy Recovery In A Power Converter |
| CN203775058U (en) * | 2014-03-26 | 2014-08-13 | 浙江駻捷新能源科技有限公司 | LED driving power supply based on single-end flyback transformer leakage inductor energy utilization |
| CN104578844A (en) * | 2014-12-22 | 2015-04-29 | 广州金升阳科技有限公司 | Switching mode power supply circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186219A (en) * | 2016-08-25 | 2016-12-07 | 魔水科技（北京）有限公司 | Nuclear-magnetism sterilizing unit and method for sanitaryware |
| CN107026571A (en) * | 2016-12-26 | 2017-08-08 | 国网江西省电力公司电力科学研究院 | A kind of switching power unit |
| CN107094338A (en) * | 2017-06-30 | 2017-08-25 | 湖州灵感电子科技有限公司 | A kind of constant current driver circuit for LED |
| CN111384856A (en) * | 2018-12-28 | 2020-07-07 | 奇源科技有限公司 | Voltage circuit for electric shock of pests |
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Application publication date: 20150819 |
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| RJ01 | Rejection of invention patent application after publication |