CN1158746C - Control method of zero current on or off for power switch and its circuit - Google Patents
Control method of zero current on or off for power switch and its circuit Download PDFInfo
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- CN1158746C CN1158746C CNB011226463A CN01122646A CN1158746C CN 1158746 C CN1158746 C CN 1158746C CN B011226463 A CNB011226463 A CN B011226463A CN 01122646 A CN01122646 A CN 01122646A CN 1158746 C CN1158746 C CN 1158746C
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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
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- 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 present invention relates to a control method and a circuit thereof for realizing the zero-current switching-on and the zero-current switching-off of a power switch. The circuit comprises a plurality of main power switches and a soft switch control unit, wherein the main power switches are arranged on the primary side edge of a transformer; the soft switch control unit is arranged on the secondary side edge of the transformer. After the main power switches are switched on for preset time, the soft switch control unit is switched on. Before the main power switches are switched off for the preset time, the soft switch control unit is switched off so as to block the connection of a load and the secondary side edge of the transformer. The circuit of the present invention is provided with a main switch unit and a soft switch circuit unit, wherein the main switch unit comprises a plurality of main power switches; the soft switch circuit unit is connected in series with the load. The present invention realizes soft switching through adding an auxiliary power switch tube between the load and the output end. Therefore, the present invention has the advantage of simple structure, and is capable of realizing zero-voltage switching.
Description
The present invention relates to a kind of realization power switch zero current turning-on of positive activation type circuit topology and the control method and circuit thereof of shutoff of being applicable to, particularly relate to the method that a kind of utilization realizes the method for load end excision on the soft switch of power component.
In Switching Power Supply, if being operated in, power tube opens hard off state firmly, the loss in the switching process is very big, and the efficient of power supply is had very big influence; Voltage and current acute variation in switching process of hard switching can produce very big electromagnetic interference EMI simultaneously.On the other hand, in order to reduce the volume and weight of power supply, high frequencyization is a kind of trend; Yet the raising of power work frequency has greatly increased switching loss, can require higher to the heat radiation of power supply like this.Therefore, through long-term practice, people have proposed soft switch technique, promptly under the state of zero current or no-voltage power switch are opened or are turn-offed, and purpose is exactly the power density for efficient that improves power supply and raising power supply.
Present soft switch technique is more, mainly contains two big classes.A kind of is to realize no-voltage or zero current turning-on, shutoff by outer coilloading, electric capacity, diode etc. by resonance; Another kind is by auxiliary switch in parallel, adds that simultaneously resonant capacitance, the resonant inductance of necessity realized soft switch technique.China Patent No. 96120581.4 discloses a kind of method that realizes soft switch pulse-width modulation.It is that the double tube positive exciting soft-switching inversion circuit that double tube positive exciting circuit, resonant circuit and the diode that is connected above-mentioned two circuit and control circuit is formed is finished, and please refer to the circuit diagram of this method of realization shown in Figure 1A.Wherein, the double tube positive exciting circuit is made up of main switch S1, S2, DC power supply Ec, load equivalent inductance L r and load equivalent resistance R; Resonant circuit is composed in series by capacitor C 1, C2, inductance L, auxiliary switch S3, diode D3; In the double tube positive exciting circuit, also be connected to clamping diode D5 and D6.Obviously, in the circuit of this prior art, be to produce resonance by auxiliary switch S3, and utilize resonant circuit to make the electric current on main switch S1 and the S2 realize natural zero-crossing, see also the working waveform figure between each element shown in Figure 1B, main switch S1 and S2 open constantly and turn-off constantly at T2 at T1.Yet adopt the method for this prior art to realize, correspondingly just increased components and parts, and the volume of resonant inductance Lr and resonance capacitor C 1 and C2 is all bigger, the therefore difficult satisfied requirement that improves power density that provides owing to increasing resonant circuit.
Chinese patent 98113189.1 discloses the technology of the soft switch of realization of another kind of prior art, it comprises a main switch 103, an auxiliary switch 106, fly-wheel diode 100, one resonant capacitance 104, one current sources 109 that with main switch 103 are connected in parallel in parallel with main switch 103, a resonant inductance 105,107, one energy feed systems 108 of a main diode and a voltage source 101 are formed, as shown in Figure 2.This main switch 103 and auxiliary switch 106 all are to disconnect periodically and connects, and the circuit of this prior art need connect main switch 103 when auxiliary switch 106 disconnects, and a period of times are connected auxiliary switch 106 again after described main switch 103 disconnects.Because inductance 105 is connected between the tie point of current source 109 and main diode 107 coaxial main switch 103,,, and present the energy of current source 109 simultaneously so auxilliary diode 108 is presented the dump energy of resonant inductance 105 when auxiliary switch disconnects as the B point.This shows that this circuit still needs to increase a resonant inductance element, and auxiliary switch 106 is not to be zero-current switching.
Without doubt, the method for the soft switch of realization of these prior aries realizes by increasing a resonant circuit all that undoubtedly its defective is that the device increase is more.So not only increased cost, lowered reliability, and control section is also quite complicated.
One object of the present invention is to propose a kind of zero current turning-on of power switch and control method of shutoff of realizing, this method is by the conducting sequential of control setting at the soft switch of the secondary side of a transformer, realized the opening and turn-offing of zero current of power switch.
Another purpose of the present invention is to provide a kind of circuit of realizing the control of power switch zero current turning-on and shutoff, by the power switch of contacting mutually with load, realizes load is excised.
A further object of the present invention is to propose a kind of zero current turning-on of power switch and control method of shutoff of realizing, this method be by being provided with the conducting sequential of soft switch respectively on two brachium pontis of the full-bridge circuit of the former avris of a transformer, realized the opening and turn-offing of zero current of power switch.
A further object of the present invention is to provide a kind of circuit of realizing the control of power switch zero current turning-on and shutoff, can realize equally load is excised by the former limit that soft switch is arranged on transformer.
The present invention is achieved through the following technical solutions:
A kind of zero current turning-on of power switch and control method of shutoff of realizing comprises
A) the former avris at a transformer is provided with some master power switches;
B) the secondary side at a transformer is provided with a soft switch control unit, joins with load;
C) open back one predetermined instant at described master power switch and open described soft switch control unit, be used for being connected in the described load of described master power switch opening process blocking-up and described transformer secondary side;
D) turn-off last predetermined instant at described master power switch, turn-off described soft switch control unit, be used for being connected in the described load of described master power switch turn off process blocking-up and described transformer secondary side.
Described method wherein also comprises
E) between described load and described soft switch control unit, a filter unit is set;
F) in described transformer secondary side one continued flow component is set, constitutes the loop, be used for having no progeny the afterflow of described filter unit in described soft switch control unit pass with described filter unit.
Described method wherein also comprises
G) described master power switch is formed bridge circuit;
H) the first soft switch control element is set in the positive half cycle operating circuit of described transformer secondary side, before the predetermined instant after the power switch that is operated in positive half cycle that is used for described bridge circuit is opened and turn-off last predetermined instant and excise being connected and being used for positive half cycle and exporting rectification of described load and described transformer secondary side;
I) the second soft switch control element is set in the negative half period operating circuit of described transformer secondary side, before the predetermined instant after the power switch that is operated in negative half period that is used for described bridge circuit is opened and turn-off last predetermined instant and excise being connected and being used for negative half period and exporting rectification of described load and described transformer secondary side.
A kind of zero current turning-on of power switch and circuit of shutoff realized comprises
One transformer, its a former avris and a power supply join, and secondary side and load are joined, and it is characterized in that, and described circuit comprises
One main switch unit comprises some power switchs, is separately positioned on the positive-negative half-cycle operating circuit of the former avris of described transformer; With
One soft switch control unit is contacted mutually with load end, is used for before the predetermined instant after described each power switch of described main switch unit is opened and turn-offs last predetermined instant and excise being connected of described load and described transformer secondary side.
Described circuit, wherein, described soft switch control unit is a power switch component, its drain electrode and source electrode are connected between described transformer and the described load.
Described circuit, wherein, described circuit also comprises filter unit, comprises
One output inductor is contacted mutually with described load; With
One electric capacity is in parallel from the node and the described load of described filter resistance and described load.
Described circuit, wherein, described circuit also comprises a continued flow component, from node and the described inductance and the described electric capacity formation loop of described soft switch control unit and described filter inductance.
Described circuit, wherein, described continued flow component is a diode, the node of its negative electrode and described soft switch control unit and described filter inductance joins.
Described circuit, wherein, described continued flow component is a capacity cell.
Described circuit, wherein, described circuit also comprises the output rectification unit, is connected between described soft switch element and the described transformer secondary.
Described circuit, wherein, described main switch unit is a bridge circuit.
Described circuit, wherein, described soft switch control unit comprises
First power switch, be connected described transformer secondary side, the predetermined instant after the power switch that is operated in positive half cycle that is used for described main switch unit is opened and turn-off that last predetermined instant excises described load and described transformer secondary side be connected and be used for positive half cycle output rectification;
Second power switch, be connected described transformer secondary side, the predetermined instant after the power switch that is operated in negative half period that is used for described main switch unit is opened and turn-off that last predetermined instant excises described load and described transformer secondary side be connected and be used for negative half period output rectification.
A kind of zero current turning-on of power switch and control method of shutoff of realizing comprises
A) the full-bridge control circuit that constitutes by master power switch in the former avris setting of a transformer;
B) the arbitrary switch on two brachium pontis of the positive half cycle of described full-bridge control circuit and negative half period work is arranged to soft switch control unit;
C) master power switch on described arbitrary brachium pontis is opened back one predetermined instant and is opened described soft switch control unit, is used for realizing by the excision load at described master power switch opening process the zero current turning-on of this master power switch;
D) the described master power switch on described arbitrary brachium pontis turn-offs last predetermined instant, turn-offs described soft switch control unit, is used for realizing by the excision load at described master power switch turn off process the zero-current switching of described main power tube.
A kind of zero current turning-on of power switch and circuit of shutoff realized comprises
One transformer, its a former avris and a power supply join, and secondary side and load are joined; With
One full-bridge control circuit is made up of power switch pipe, is connected the former avris of described transformer, and wherein, described full-bridge control circuit comprises
First brachium pontis is used for the positive half cycle control of described circuit, has a main switch and a soft switch, and wherein this soft switch is opened and turn-offed last predetermined instant at this main switch and turn-off before the predetermined instant after this main switch is opened respectively; With
Second brachium pontis is used for the negative half period control of described circuit, has a main switch and a soft switch, and wherein this soft switch is opened and turn-offed last predetermined instant at this main switch and turn-off before the predetermined instant after this main switch is opened respectively.
According to an aspect of the present invention, the present invention is owing to add an auxiliary power switching tube between load and output, realize the zero current turning-on and the shutoff of power switch pipe by method, therefore need in circuit, not add resonant inductance or resonant capacitance is realized soft switch load excision.
According to a further aspect of the invention, auxiliary switch is fast owing to turn-off speed, and simultaneously owing to the effect of clamp element, the voltage difference before and after this auxiliary switch turn-offs is very little, can realize the no-voltage shutoff.Therefore, circuit structure of the present invention is simple, has realized the soft switch of master power switch, auxiliary switch simultaneously, thereby can obviously improve the converter operating efficiency, is with a wide range of applications.
By description, above-mentioned purpose of the present invention and advantage will be shown and suggestion below in conjunction with accompanying drawing to preferred embodiment of the present invention.
Figure 1A is the circuit diagram that a kind of natural zero-crossing that utilizes resonant circuit of prior art is realized soft switch;
Figure 1B is the working waveform figure of circuit shown in Figure 1A;
Fig. 2 utilizes the circuit diagram of the soft switch that auxiliary switch and resonant circuit realize when being another prior art;
Fig. 3 is the circuit diagram of a preferred embodiment of the present invention, and wherein auxiliary switch is arranged on the secondary side of transformer;
Fig. 4 A-4C is the drive waveforms figure of the power tube of circuit shown in Figure 3;
Fig. 5 is the circuit diagram of another preferred embodiment of the present invention, wherein utilizes a capacity cell as clamp element;
Fig. 6 is the circuit diagram of another preferred embodiment of the present invention, and wherein the output rectification circuit element while is as the control element of soft switch;
Fig. 7 A-7C is the drive waveforms figure of power switch pipe among Fig. 6;
Fig. 8 is the circuit diagram of another preferred embodiment of the present invention, wherein utilizes in two brachium pontis of full-bridge circuit a soft switch is set respectively.
Fig. 9 A-9D is the drive waveforms figure of power switch in the circuit shown in Figure 8.
Hereinafter, will describe the present invention in detail.
Shown in Figure 3 is the circuit 200 of first preferred embodiment of the present invention, and it comprises a transformer (T1) 202; One is connected the full-bridge circuit of these transformer 202 former avris, is made up of Q1A, Q2A, Q1B and Q2B; One is arranged on the output rectification circuit 206 of transformer secondary side, is made up of D1 and D2; One switching tube 208 (Q3) that joins with this output rectification circuit 206; One output filter circuit 210 is made up of filter inductance L1 and C1; With, a continued flow component 212.
The drive waveforms of general full-bridge circuit is shown in Fig. 4 A-4B, and under the driving of this driving pulse, power switch pipe is a hard switching, and switching loss is big.For the ease of power tube zero current turning-on and the shutoff in the full-bridge circuit, circuit 200 of the present invention is compared with general bridge circuit, its outlet side has added a switching tube 208, at the pipe Q1A of full-bridge circuit 204, Q1B, Q2A, before Q2B turn-offs, shilling switching tube 208 turn-offs, and is equivalent to like this that transformer load is cut to be fallen, and transformer 202 is unloaded.If so ignore exciting curent, pipe Q1A, Q1 B, Q2A, the electric current of Q2B are zero, manage Q1A like this, Q1B, Q2A, Q2B turn-off under the almost nil situation of electric current.Similarly, the present invention manages Q1A, Q1B, and Q2A just opens Q3 after Q2B opens, like this at pipe Q1A, Q1B, Q2A in the opening process of Q2B, is equivalent to transformer 202 zero loads, then power tube Q1A, Q1B, Q2A, Q2B has realized zero current turning-on.
Its concrete course of work is consulted the drive waveforms of the Q1A shown in Fig. 4 A, Q2B respectively, the drive waveforms of the auxiliary switch 208 shown in the drive waveforms of the Q2A shown in Fig. 4 B, Q1B and Fig. 4 C.
Be located at the zero hour of one-period, power tube Q1A, Q1B, Q2A, Q2B, Q3 all are in off state, the inductance L 1 of output filter circuit 210 is by continued flow component 212, and as diode D3 afterflow, the load (not shown) is by output inductor L1 and capacitor C 1 power supply.Open Q1A, Q2B constantly at T0, turn-off owing to manage 208 this moment, the electric current by Q1A, Q2B only has exciting curent, no-load current, and exciting curent is very little, so Q1A, Q2B are open-minded under zero current condition.
At T1 constantly, power tube 208 is open-minded, and load end inserts transformer 202, and the electric current of flowing pipe Q1A, Q2B progressively increases, and sustained diode 3 is turn-offed, and load provides energy by transformer 202 former limits.
At T2 constantly, power tube 208 turn-offs, diode D3 conducting, and inductance L 1 is by diode D3 afterflow.
At T3 constantly, because load is cut, transformer T1 zero load, the electric current of power tube Q1A, Q2B is zero (ignoring the transformer excitation electric current), turn-off pipe Q1A, Q2B is zero-current switching this moment.
At T4 constantly, open Q1B, Q2A, this moment, transformer was unloaded because power tube 208 is in off state, pipe Q1B, Q2A zero current turning-on.
At T5 constantly, power tube Q3 is open-minded, and load end inserts transformer, and the electric current of the Q2A that flows through, Q1B progressively increases, and sustained diode 3 is turn-offed, and load provides energy by the former limit of transformer 202.
At T6 constantly, power tube 208 turn-offs, diode D3 conducting, and inductance L 1 is by diode D3 afterflow.
At T7 constantly, because load is cut, no-load transformer, the electric current of power tube Q2A, Q1B are zero (ignoring the transformer excitation electric current), and manage Q2A, Q1B is to turn-off under zero current condition this moment.
At T8 constantly, the beginning of new one-period.
Specifically, the power switch pipe 208 that increases in the circuit 200, turn-off speed is very fast.Because diode D3 junction capacitance is bigger, the shutoff of this pipe is that no-voltage is turn-offed.What deserves to be mentioned is that main switch is relevant with the characterisitic parameter of switch Q3 itself with the blanking time that auxiliary switch Q3 of the present invention opens or turn-offs.
Shown in Figure 5 is the circuit 300 of an alternative embodiment of the invention, is the little capacitor C 2 of continued flow component 312 usefulness has been replaced diode D3 in embodiment illustrated in fig. 3, can eliminate the conduction loss of this diode D3 so further.
Shown in Figure 6 is the circuit 400 of another embodiment of the present invention, wherein output rectification circuit 406 is to utilize power switch tube S 5, S6 to replace output rectifier diode D1, D2 in the rectifying output circuit 206 of circuit 200 shown in Figure 3, drive waveforms by control switch pipe S5 and S6, can realize the turn-on and turn-off of main switch zero current equally, the drive waveforms figure shown in Fig. 7 A-7C.
Be located at one-period zero hour, power tube S1-S4 and output rectifying tube S5-S6 all are in off state, the inductance L 1 of output filter circuit 410 is by continued flow component 412, and as diode D1 afterflow, the load (not shown) is by output inductor L1 and capacitor C 1 power supply.When T0, be engraved in positive half cycle and open S1 and S4,, exciting curent is only arranged by the electric current of managing S1 and S4 because the pipe S5 of positive this moment half cycle output rectification turn-offs, no-load current, exciting curent is very little, so S1 and S4 are open-minded under zero current condition.
At T1 constantly, power tube S5 is open-minded, and load end inserts transformer 402, and the electric current of flowing pipe S1 and S4 progressively increases, and sustained diode 1 is turn-offed, and load provides energy by transformer 402 former limits.
At T2 constantly, pipe S5 turn-offs, diode D1 conducting, and inductance L 1 is by diode D1 afterflow.
At T3 constantly, because load is cut, transformer 402 zero loads, the electric current of power tube S1 and S4 is zero (ignoring the transformer excitation electric current), turn-off pipe S1 and S4 is zero-current switching this moment.
At T4 constantly, open the pipe S3 and the S2 of negative half period work, this moment, pipe S3 and S2 were zero current turning-ons because the pipe S6 of negative half period output rectification is in off state, and transformer is unloaded.
At T5 constantly, power tube S6 is open-minded, and load end inserts transformer 402, and the electric current of flowing pipe S3 and S2 progressively increases, and sustained diode 1 is turn-offed, and load provides energy by transformer 402 former limits.
At T6 constantly, pipe S6 turn-offs, diode D1 conducting, and inductance L 1 is by diode D1 afterflow.
At T7 constantly, because load is cut, transformer 402 zero loads, the electric current of power tube S3 and S2 is zero (ignoring the transformer excitation electric current), turn-off pipe S3 and S2 is zero-current switching this moment.
At T8 constantly, the beginning of new one-period.
This shows, will export simultaneously in the embodiments of the invention that rectified power is effective makes soft switch control unit, thereby can remove the auxiliary switch Q3 in embodiment illustrated in fig. 3.
According to technical scheme of the present invention, shown in Figure 8 is another preferred embodiment, and promptly circuit 500.Former avris at transformer 502 is provided with full-bridge circuit 204, comprises power tube Q1A, Q1B, Q2A, Q2B; The secondary side is connected with output rectification circuit 506, comprises diode D1 and D2; Output filter circuit 5 10 comprises inductance L 1 and capacitor C 1; And continued flow component, as diode D3.
All be arranged to a main switch and an auxiliary switch in two brachium pontis of the present invention with this rectification circuit, establishing pipe Q1A on for example positive half cycle brachium pontis is main switch, and pipe Q2B is an auxiliary switch; Establishing pipe Q2A on the negative half period brachium pontis is main switch, and Q2B is an auxiliary switch.Its drive waveforms figure sees also shown in Fig. 9 A-9D.
Be located at the zero hour of one-period, power tube Q1A, Q1B, Q2A, Q2B all are in off state, and the inductance L 1 of output filter circuit 510 is by continued flow component 212, and as diode D3 afterflow, the load (not shown) is by output inductor L1 and capacitor C 1 power supply.Open Q1A constantly at T0, turn-off owing to manage Q2B this moment, so Q1A is open-minded under zero current condition.
At T1 constantly, Q2B is open-minded for pipe, and the electric current of flowing pipe Q1A, Q2B progressively increases, and sustained diode 3 is turn-offed, and load provides energy by transformer 502 former limits.
At T2 constantly, pipe Q2B turn-offs, diode D3 conducting, and inductance L 1 is by diode D3 afterflow.
At T3 constantly, because load is cut, transformer T1 zero load, the electric current of power tube Q1A is zero (ignoring the transformer excitation electric current), turn-off pipe Q1A is zero-current switching this moment.
At T4 constantly, open Q2A, manage Q2A zero current turning-on because pipe Q1B is in off state this moment.
At T5 constantly, Q1B is open-minded for pipe, and load end inserts transformer, and the electric current of the Q2A that flows through, Q1B progressively increases, and sustained diode 3 is turn-offed, and load provides energy by the former limit of transformer 502.
At T6 constantly, pipe Q1B turn-offs, diode D3 conducting, and inductance L 1 is by diode D3 afterflow.
At T7 constantly, because load is cut, no-load transformer, the electric current of power tube Q2A, Q1B are zero (ignoring the transformer excitation electric current), and manage Q2A is to turn-off under zero current condition this moment.
At T8 constantly, the beginning of new one-period.
This shows,, can utilize the zero current turning-on or the shutoff that the method for load excision are realized master power switch equally if auxiliary switch is arranged on the former avris of transformer.
Claims (14)
1, a kind of zero current turning-on of power switch and control method of shutoff of realizing comprises
A) the former avris at a transformer is provided with some master power switches;
B) the secondary side at a transformer is provided with a soft switch control unit, joins with load;
C) open back one predetermined instant at described master power switch and open described soft switch control unit, be used for being connected in the described load of described master power switch opening process blocking-up and described transformer secondary side;
D) turn-off last predetermined instant at described master power switch, turn-off described soft switch control unit, be used for being connected in the described load of described master power switch turn off process blocking-up and described transformer secondary side.
2, method according to claim 1 wherein also comprises
E) between described load and described soft switch control unit, a filter unit is set;
F) in described transformer secondary side one continued flow component is set, constitutes the loop, be used for having no progeny the afterflow of described filter unit in described soft switch control unit pass with described filter unit.
3, method according to claim 2 wherein also comprises
G) described master power switch is formed bridge circuit;
H) the first soft switch control element is set in the positive half cycle operating circuit of described transformer secondary side, before the predetermined instant after the power switch that is operated in positive half cycle that is used for described bridge circuit is opened and turn-off last predetermined instant and excise being connected and being used for positive half cycle and exporting rectification of described load and described transformer secondary side;
I) the second soft switch control element is set in the negative half period operating circuit of described transformer secondary side, before the predetermined instant after the power switch that is operated in negative half period that is used for described bridge circuit is opened and turn-off last predetermined instant and excise being connected and being used for negative half period and exporting rectification of described load and described transformer secondary side.
4, a kind of zero current turning-on of power switch and circuit of shutoff realized comprises
One transformer, its a former avris and a power supply join, and secondary side and load are joined, and it is characterized in that, and described circuit comprises
One main switch unit comprises some power switchs, is separately positioned on the positive-negative half-cycle operating circuit of the former avris of described transformer; With
One soft switch control unit is contacted mutually with load end, is used for before the predetermined instant after described each power switch of described main switch unit is opened and turn-offs last predetermined instant and excise being connected of described load and described transformer secondary side.
5, circuit according to claim 4 is characterized in that, described soft switch control unit is a power switch component, and its drain electrode and source electrode are connected between described transformer and described negative the planting.
6, circuit according to claim 5 is characterized in that, described circuit also comprises filter unit, comprises
One output inductor is contacted mutually with described load; With
One electric capacity is in parallel from the node and the described load of described filter inductance and described load.
7, circuit according to claim 6 is characterized in that, described circuit also comprises a continued flow component, from node and the described inductance and the described electric capacity formation loop of described soft beginning control unit and described filter inductance.
8, circuit according to claim 6 is characterized in that, described continued flow component is a diode, and the node of its negative electrode and described soft switch control unit and described filter inductance joins.
9, circuit according to claim 6 is characterized in that, described continued flow component is a capacity cell.
10, circuit according to claim 6 is characterized in that, described circuit also comprises the output rectification unit, is connected between described soft switch element and the described transformer secondary.
11, circuit according to claim 4 is characterized in that, described main switch unit is a bridge circuit.
12, circuit according to claim 11 is characterized in that, described soft switch control unit comprises
First power switch, be connected described transformer secondary side, the predetermined instant after the power switch that is operated in positive half cycle that is used for described main switch unit is opened and turn-off that last predetermined instant excises described load and described transformer secondary side be connected and be used for positive half cycle output rectification;
Second power switch, be connected described transformer secondary side, the predetermined instant after the power switch that is operated in negative half period that is used for described main switch unit is opened and turn-off that last predetermined instant excises described load and described transformer secondary side be connected and be used for negative half period output rectification.
13, a kind of zero current turning-on of power switch and control method of shutoff of realizing comprises
A) the full-bridge control circuit that constitutes by master power switch in the former avris setting of a transformer;
B) the arbitrary switch on two brachium pontis of the positive half cycle of described full-bridge control circuit and negative half period work is arranged to soft switch control unit;
C) master power switch on described arbitrary brachium pontis is opened back one predetermined instant and is opened described soft switch control unit, is used for realizing by the excision load at described master power switch opening process the zero current turning-on of this master power switch;
D) the described master power switch on described arbitrary brachium pontis turn-offs last predetermined instant, turn-offs described soft switch control unit, is used for realizing by the excision load at described master power switch turn off process the zero-current switching of described main power tube.
14, a kind of zero current turning-on of power switch and circuit of shutoff realized comprises
One transformer, its a former avris and a power supply join, and secondary side and load are joined; With
One full-bridge control circuit is made up of power switch pipe, is connected the former avris of described transformer, it is characterized in that, described full-bridge control circuit comprises
First brachium pontis is used for the positive half cycle control of described circuit, has a main switch and a soft switch, and wherein this soft switch is opened and turn-offed last predetermined instant at this main switch and turn-off before the predetermined instant after this main switch is opened respectively; With
Second brachium pontis is used for the negative half period control of described circuit, has a main switch and a soft switch, and wherein this soft switch is opened and turn-offed last predetermined instant at this main switch and turn-off before the predetermined instant after this main switch is opened respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011226463A CN1158746C (en) | 2001-06-26 | 2001-06-26 | Control method of zero current on or off for power switch and its circuit |
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| CNB011226463A CN1158746C (en) | 2001-06-26 | 2001-06-26 | Control method of zero current on or off for power switch and its circuit |
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| CN1158746C true CN1158746C (en) | 2004-07-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1732200A1 (en) * | 2005-06-09 | 2006-12-13 | Koninklijke Philips Electronics N.V. | Method for operating a power converter in a soft-switching range |
| US7375984B2 (en) | 2006-06-16 | 2008-05-20 | Astec Custom Power (Hk) Ltd. | Zero voltage zero current switching converter |
| CN103051238A (en) * | 2013-01-29 | 2013-04-17 | 西安龙腾新能源科技发展有限公司 | Control method suitable for non-isolated single-phase photovoltaic grid inverter circuit |
| CN106992611B (en) * | 2017-05-26 | 2020-02-21 | 中惠创智（深圳）无线供电技术有限公司 | Wireless power supply transmitting terminal control method and device and wireless power supply system |
| CN108121430B (en) * | 2017-12-20 | 2021-04-02 | 福建利利普光电科技有限公司 | Apply to soft start circuit of taking battery route of data acquisition system |
-
2001
- 2001-06-26 CN CNB011226463A patent/CN1158746C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1393985A (en) | 2003-01-29 |
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Address after: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee after: Vitamin Technology Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |
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Granted publication date: 20040721 Termination date: 20190626 |