CN100578903C - Resonant converter and intermittent operation mode starting method - Google Patents
Resonant converter and intermittent operation mode starting method Download PDFInfo
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- CN100578903C CN100578903C CN200610128094A CN200610128094A CN100578903C CN 100578903 C CN100578903 C CN 100578903C CN 200610128094 A CN200610128094 A CN 200610128094A CN 200610128094 A CN200610128094 A CN 200610128094A CN 100578903 C CN100578903 C CN 100578903C
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Abstract
This invention relates to a resonance converter and a start-up method for its intermittent working mode, in which, the converter includes a converting circuit stage, a transformer sensing the output of which to the secondary side from the first, a rectifying circuit stage rectifying its output, a filter and load circuit stage filtering the output of the rectifying circuit stage and outputting it and a charge pump circuit coupled to the transformer or the rectifying circuit. The start-up method includes: utilizing the charge pump circuit to increase the potential of the filter and load circuit stage to higher than a preset value to change the feedback voltage of the resonance converter to start up an intermittent mode according to the change.
Description
Technical field
The present invention is meant the startup method of a kind of resonance converter and intermittent operation mode (Burst Mode) thereof, is meant the resonance DC-direct current transducer that is applied to power supply unit (Power Supply Apparatus) especially.
Background technology
In recent years, the development trend of power supply unit is as most power supply product, direction towards high efficiency (High Efficiency), high power density (High Power Density), high reliability (HighReliability) and low cost (Low Cost) develops, particularly, in order to reach energy-conservation and purpose environmental protection, the requirement that runs on the low power consumption under underloading or the unloaded situation for power supply unit also grows with each passing day.
For the resonance converter in the power supply unit, intermittent operation mode is a kind of power-saving technology that more and more generally is used; For example, inverse-excitation type (Flyback) AC-DC converter in the adapter of mobile computer (Adapter) or buck (Buck) DC-to-DC converter in the mobile phone are all usually used this technology.
Run under underloading or the unloaded situation at power supply unit, when using intermittent operation mode to control, the power supply unit that is in switch mode is earlier with normal working frequency fs operation Ton one period cycle time, another section Toff cycle time that then quits work again runs under this normal working frequency fs at last.Wherein, 1/ (Ton+Toff) is forever less than this normal working frequency fs, and the minimizing ratio of circuit loss is Toff/ (Ton+Toff).
By the leading portion narration as can be known, the key point of using intermittent operation mode to control is: must produce a signal, arrive the moment that start intermittent operation mode in order to the load state that detects this transducer.The method that several are used to detect the load state of transducer has been proposed in the known technology; Such as secondary side current that detects the transformer in the transducer or detection median voltage (such as the feedback voltage in the loop circuit of the power supply unit that is in switch mode) etc.
This use loop circuit feedback voltage often is used among boost type (Boost type) topology (for example booster circuit, fall-boost type circuit and reverse excitation circuit) and buck (Buck type) topology (for example reduction voltage circuit, forward converter, half-bridge circuit and full-bridge circuit) with the control method that triggers intermittent operation mode as median voltage.Run on underloading situation following time when having above these topological transducers, its operating current is in discontinuous mode (DCM), this can make output voltage produce marked change with respect to the gain of input voltage, and this variation then can be reflected on the change in voltage of compensation circuit.Therefore, just can correctly obtain the load state of transducer by the feedback voltage in the detection compensation circuit.
Yet the method that detects feedback voltage in this compensation circuit is applied in still has its shortcoming in the resonance converter, it below is described.
See also Fig. 1, it is the circuit diagram of known resonance DC-direct current transducer.In Fig. 1, resonance DC-direct current transducer 10 is made of change-over circuit level 11, transformer Tx, rectification circuit level 12 and filtering and 13 of load circuit levels; Wherein, change-over circuit level 11 has comprised resonant capacitance Cr, resonant inductance Lr and magnetizing inductance Lm, and rectification circuit level 12 has comprised diode D1 and D2, and filtering and load circuit level 13 then are made of filter capacitor Cout and load Rload.The operation principle of resonance DC-direct current transducer 10 is, direct voltage is accepted high frequency through the switching of switch Q1, Q2 by change-over circuit level 11 earlier and is cut ripple, accept rectification through rectification circuit level 12 again, be sent to filtering and load circuit level 13 at last and accept to be output to load Rload after the filtering.
When the method for the feedback voltage that uses aforesaid detection compensation circuit during in the resonance DC of Fig. 1-direct current transducer 10, because resonance DC-direct current transducer 10 utilizes frequency modulation(FM) (FrequencyModulation) method to control, therefore its operating frequency can't change too much in different load state following time, if and operating frequency need not change too much, feedback voltage can not change too much yet, just is difficult to this moment only carry out the control of intermittent operation mode by detecting median voltage; And the scheme that substitutes is, carries out the control of intermittent operation mode by the secondary side current that detects transformer Tx, but does not more conform with manufacturing cost but this kind scheme is too complicated.
Summary of the invention
The startup method that proposes a kind of resonance converter and intermittent operation mode thereof that mainly is contemplated that of the present invention, can make the feedback voltage of the compensation circuit that this resonance converter had more easily be detected, and can be more appropriate and ideally start the intermittent operation mode of this resonance converter.
According to main conception of the present invention, a kind of resonance converter is proposed, comprising: the change-over circuit level; Transformer is coupled to this change-over circuit level, and the output of this change-over circuit level is induced to secondary side by primary side; The rectification circuit level is coupled to the secondary side of this transformer, and rectification is carried out in the output of this transformer; Filtering and load circuit level are coupled to this rectification circuit level, and filtering and output are carried out in the output of this rectification circuit level; Charge pump circuit, with at least one composed component coupled in parallel of this rectification circuit level, this charge pump circuit is to this filtering and the charging of load circuit level and make the current potential of this filtering and load circuit level be higher than predetermined value, and wherein this composed component is a semiconductor device; And compensation circuit, the feedback voltage that this compensation circuit had discharges at this charge pump circuit and changes can make this current potential of this filtering and load circuit level be higher than this predetermined value the time, and this resonance converter promptly changes according to this and starts intermittent operation mode.
According to described resonance converter, wherein this change-over circuit level comprises resonant circuit and magnetizing inductance, and this magnetizing inductance is connected with this resonant circuit after being parallel to this transformer primary side again.
According to described resonance converter, wherein this resonant circuit comprises resonant capacitance and the resonant inductance that is one another in series.
According to described resonance converter, wherein this rectification circuit level be selected from full-wave rectifying circuit and full bridge rectifier one of them.
According to described resonance converter, wherein this charge pump circuit is made of at least one electric capacity, and this electric capacity is parallel at least one composed component of this rectification circuit level.
According to main conception of the present invention, other proposes a kind of resonance converter, comprising: the change-over circuit level; Transformer is coupled to this change-over circuit level, and the output of this change-over circuit level is induced to secondary side by primary side; The rectification circuit level is coupled to the secondary side of this transformer, and rectification is carried out in the output of this transformer; Filtering and load circuit level are coupled to this rectification circuit level, and filtering and output are carried out in the output of this rectification circuit level; Charge pump circuit, couple mutually with the primary side or the secondary side of this transformer, this charge pump circuit is to this filtering and the charging of load circuit level and make the current potential of this filtering and load circuit level be higher than predetermined value, makes this resonance converter start intermittent operation mode whereby; And compensation circuit, the feedback voltage that this compensation circuit had discharges at this charge pump circuit and changes can make this current potential of this filtering and load circuit level be higher than this predetermined value the time, and this resonance converter promptly changes according to this and starts intermittent operation mode.
According to described resonance converter, wherein this change-over circuit level comprises resonant circuit and magnetizing inductance, and this magnetizing inductance is connected with this resonant circuit after being parallel to this transformer primary side again.
According to described resonance converter, wherein this resonant circuit comprises resonant capacitance and the resonant inductance that is one another in series.
According to described resonance converter, wherein this rectification circuit level be selected from full-wave rectifying circuit and full bridge rectifier one of them.
According to described resonance converter, wherein this charge pump circuit is made of at least one electric capacity, and this electric capacity is coupled to the primary side of this transformer.
According to described resonance converter, wherein this charge pump circuit is made of at least one electric capacity, and this electric capacity is coupled to the part of this Circuit Fault on Secondary Transformer at least.
According to main conception of the present invention, reintroduce a kind of startup method of intermittent operation mode of resonance converter, this resonance converter comprises the change-over circuit level, the output of this change-over circuit level is induced to the transformer of secondary side by primary side, the output of this transformer is carried out the rectification circuit level of rectification, the output of this rectification circuit level is carried out the filtering and the load circuit level of filtering and output, and with at least one composed component coupled in parallel of this rectification circuit level or the charge pump circuit that couples mutually with the primary side or the secondary side of this transformer, wherein this composed component is a semiconductor device, this startup method comprises the following steps: to utilize this charge pump circuit to this filtering and the charging of load circuit level, to being higher than predetermined value, make the feedback voltage that this resonance converter had change with the current potential that promotes this filtering and load circuit level; And make this resonance converter start intermittent operation mode according to this variation.
The invention provides the startup method of a kind of resonance converter and intermittent operation mode thereof, rectification circuit level or transformer coupling capacitance at traditional resonance converter, make the feedback voltage of the compensation circuit that this resonance converter had more easily be detected, and can be more appropriate and ideally start the intermittent operation mode of this resonance converter.
The present invention obtains more deep understanding by following graphic and detailed description:
Description of drawings
Fig. 1: the circuit diagram of known resonance DC-direct current transducer;
Fig. 2: the circuit diagram of resonance converter first preferred embodiment of the present invention;
Fig. 3: the circuit diagram of resonance converter second preferred embodiment of the present invention;
Fig. 4: the circuit diagram of resonance converter the 3rd preferred embodiment of the present invention;
Fig. 5: the circuit diagram of resonance converter the 4th preferred embodiment of the present invention;
Fig. 6: the circuit diagram of resonance converter the 5th preferred embodiment of the present invention;
Fig. 7: the circuit diagram of resonance converter the 6th preferred embodiment of the present invention;
Fig. 8: the circuit diagram of resonance converter the 7th preferred embodiment of the present invention;
Fig. 9: the circuit diagram of resonance converter the 8th preferred embodiment of the present invention; And
Figure 10: the circuit diagram of resonance converter the 9th preferred embodiment of the present invention.
Wherein, description of reference numerals is as follows:
10,20,30,40,50 resonance DCs-direct current transducer
60,70,80,90,100 resonance DCs-direct current transducer
11,21 change-over circuit levels
12,22,32 rectification circuit levels
13,23 filtering and load circuit level
24,84 charge pump circuits
Ca, Ca1, Ca2, Ca3, Ca4 electric capacity
The Cout filter capacitor
The Cr resonant capacitance
D1, D2 diode
The Lm magnetizing inductance
The Lr resonant inductance
The Rload load
Q1, Q2 switch
The Tx transformer
Embodiment
See also Fig. 2, it is for the circuit diagram of resonance converter first preferred embodiment of the present invention, and in Fig. 2, the circuit element identical with earlier figures 1 indicates identical Reference numeral.Similar with the known technology of Fig. 1, resonance DC-direct current transducer 20 mainly is made of change-over circuit level 21, transformer Tx, rectification circuit level 22 and filtering and 23 of load circuit levels; Wherein, change-over circuit level 21 has comprised magnetizing inductance Lm and the resonant circuit that is one another in series and is constituted by resonant capacitance Cr and resonant inductance Lr, rectification circuit level 22 has comprised diode D1 and D2, and filtering and load circuit level 23 then are made of filter capacitor Cout and load Rload.
The operation principle of resonance DC-direct current transducer 20 is, direct voltage is accepted high frequency through the switching of switch Q1, Q2 by change-over circuit level 21 earlier and is cut ripple, be induced to after the secondary side by primary side by transformer Tx again, rectification through rectification circuit level 22 is sent to filtering and load circuit level 23 at last and accepts to be output to load Rload after the filtering.
Difference is, the present invention has coupled the circuit 24 that an operation function is equal to charge pump (Charge Pump) on rectification circuit level 22.In the embodiment shown in Figure 2, charge pump circuit 24 is made of capacitor C a1, and its coupled in parallel is in one of them diode D1 of rectification circuit level 22, and below explanation capacitor C a1 is in operational mode of the present invention.
Close at switch Q1 among the half period of (OFF) and switch Q2 unlatching (ON), capacitor C a1 is charged; And among the half period that switch Q1 opens and switch Q2 closes, then make capacitor C a1 discharge, at this moment, the electric energy that capacitor C a1 emitted can be transferred into filter capacitor Cout, this mechanism then increased in each cycle the energy of the filtering that is sent to and load circuit level 23.When resonance DC-direct current transducer 20 works in underloading, the additional electrical energy that this strand is transferred into filter capacitor Cout make filter capacitor Cout be charged to its current potential to be higher than predetermined value--potential setting point of the loop of transducer 20---, at this moment, the feedback voltage that the compensation circuit (not shown) that transducer 20 is connected is had is will be because of this former thereby increase frequency of operation so as to reducing output end voltage, this measure meeting makes this feedback voltage in this compensation circuit produce saltus step, at this moment, transducer 20 can be with detected this saltus step as triggering signal to start the intermittent work pattern.
See also Fig. 3, it is for the circuit diagram of resonance converter second preferred embodiment of the present invention, in Fig. 3, the circuit element identical with earlier figures 2 indicates identical Reference numeral, in this embodiment, though the same structures that adopt by the full-wave rectifying circuit that diode constituted of rectification circuit level 32, on diode D1 and D2 respectively coupled in parallel capacitor C a1 and Ca2 to constitute this charge pump circuit, to reach function as aforesaid startup intermittent work pattern.Must be noted that comparing slightly different part with aforesaid first preferred embodiment is, in first preferred embodiment, be transferred into the electric energy that the electric energy of output transmits greater than second half cycle in a half period; And in the present embodiment, the electric energy that is transferred into output is all equal in two half periods.
See also Fig. 4, it is for the circuit diagram of resonance converter the 3rd preferred embodiment of the present invention, in Fig. 4, the circuit element identical with earlier figures 3 indicates identical Reference numeral, just in this embodiment, the rectification circuit level changes the structure of employing by the full bridge rectifier that diode constituted into, wherein on diode D1～D4 respectively coupled in parallel a capacitor C a1～Ca4 to constitute this charge pump circuit, to reach function as aforesaid startup intermittent work pattern.
See also Fig. 5, it is for the circuit diagram of resonance converter the 4th preferred embodiment of the present invention, in Fig. 5, the circuit element identical with earlier figures 4 indicates identical Reference numeral, in this embodiment, though the same structures that adopt by the full bridge rectifier that diode constituted of rectification circuit level 32, only on diode D1 and D4 respectively coupled in parallel capacitor C a1 and Ca4 to constitute this charge pump circuit, to reach function as aforesaid startup intermittent work pattern.
See also Fig. 6, it is for the circuit diagram of resonance converter the 5th preferred embodiment of the present invention, in Fig. 6, with earlier figures 5 differences be, changed on diode D1 and D2 respectively coupled in parallel into capacitor C a1 and Ca2 is to constitute this charge pump circuit, to reach the function as aforesaid startup intermittent work pattern.
See also Fig. 7, it is for the circuit diagram of resonance converter the 6th preferred embodiment of the present invention, in Fig. 7, with earlier figures 6 differences be, only change in diode D1 go up coupled in parallel a capacitor C a1 to constitute this charge pump circuit, to reach function as aforesaid startup intermittent work pattern.
All couple to realize transducer of the present invention though it should be noted that each embodiment of earlier figures 2 to Fig. 7, also can adopt the parasitic capacitance of each rectification circuit level to replace, to reach same purpose with the electric capacity of entity.
In addition, except earlier figures 2 to Fig. 7 propositions are coupled to the structure of rectification circuit level with charge pump circuit, to those skilled in the art, satisfying under the prerequisite of identical function, also can visualize the structure that charge pump circuit is coupled to transformer Tx, below it is illustrated.
See also Fig. 8, it is for the circuit diagram of resonance converter the 7th preferred embodiment of the present invention, in Fig. 8, the circuit element identical with earlier figures 2 indicates identical Reference numeral, just in this embodiment, the capacitor C a that constitutes charge pump circuit 84 is coupled to the primary side of transformer Tx, to reach function as aforesaid startup intermittent work pattern.
Except the circuit structure of Fig. 8, to those skilled in the art, the capacitor C a that constitutes charge pump circuit can also be coupled to the secondary side of transformer Tx, to reach function, shown in the 8th embodiment of Fig. 9 as aforesaid startup intermittent work pattern; In Fig. 9, capacitor C a is coupled to the transformer Tx of the secondary side of (Center Tap) structure that has center tap, and Figure 10 then is the 9th embodiment that respectively connects a capacitor C a1, Ca2 in the both sides of center tap.
All couple to realize transducer of the present invention though it should be noted that each embodiment of earlier figures 8 to Figure 10, also can adopt the parasitic capacitance of each transformer to replace, to reach same purpose with the electric capacity of entity.
Though more than among listed each embodiment the rectification circuit composed component all be example with the diode, other semiconductor device Mosfet for example in fact, IGBT etc. can be as composed component.
In sum, the invention provides the startup method of a kind of resonance converter and intermittent operation mode thereof, rectification circuit level or transformer coupling capacitance at traditional resonance converter, make the feedback voltage of the compensation circuit that this resonance converter had more easily be detected, and can be more appropriate and ideally start the intermittent operation mode of this resonance converter.
Claims (12)
1. resonance converter comprises:
The change-over circuit level;
Transformer is coupled to this change-over circuit level, and the output of this change-over circuit level is induced to secondary side by primary side;
The rectification circuit level is coupled to the secondary side of this transformer, and rectification is carried out in the output of this transformer;
Filtering and load circuit level are coupled to this rectification circuit level, and filtering and output are carried out in the output of this rectification circuit level;
Charge pump circuit, with at least one composed component coupled in parallel of this rectification circuit level, this charge pump circuit is to this filtering and the charging of load circuit level and make the current potential of this filtering and load circuit level be higher than predetermined value, and wherein this composed component is a semiconductor device; And
Compensation circuit, the feedback voltage that this compensation circuit had discharge at this charge pump circuit and change can make this current potential of this filtering and load circuit level be higher than this predetermined value the time, and this resonance converter promptly changes according to this and starts intermittent operation mode.
2. resonance converter as claimed in claim 1, wherein this change-over circuit level comprises resonant circuit and magnetizing inductance, this magnetizing inductance is connected with this resonant circuit after being parallel to this transformer primary side again.
3. resonance converter as claimed in claim 2, wherein this resonant circuit comprises resonant capacitance and the resonant inductance that is one another in series.
4. resonance converter as claimed in claim 1, wherein this rectification circuit level be selected from full-wave rectifying circuit and full bridge rectifier one of them.
5. resonance converter as claimed in claim 4, wherein this charge pump circuit is made of at least one electric capacity, and this electric capacity is parallel at least one composed component of this rectification circuit level.
6. resonance converter comprises:
The change-over circuit level;
Transformer is coupled to this change-over circuit level, and the output of this change-over circuit level is induced to secondary side by primary side;
The rectification circuit level is coupled to the secondary side of this transformer, and rectification is carried out in the output of this transformer;
Filtering and load circuit level are coupled to this rectification circuit level, and filtering and output are carried out in the output of this rectification circuit level;
Charge pump circuit couples mutually with the primary side or the secondary side of this transformer, and this charge pump circuit is to this filtering and the charging of load circuit level and make the current potential of this filtering and load circuit level be higher than predetermined value; And
Compensation circuit, the feedback voltage that this compensation circuit had discharge at this charge pump circuit and change can make this current potential of this filtering and load circuit level be higher than this predetermined value the time, and this resonance converter promptly changes according to this and starts intermittent operation mode.
7. resonance converter as claimed in claim 6, wherein this change-over circuit level comprises resonant circuit and magnetizing inductance, this magnetizing inductance is connected with this resonant circuit after being parallel to this transformer primary side again.
8. resonance converter as claimed in claim 7, wherein this resonant circuit comprises resonant capacitance and the resonant inductance that is one another in series.
9. resonance converter as claimed in claim 6, wherein this rectification circuit level be selected from full-wave rectifying circuit and full bridge rectifier one of them, composed component is a semiconductor device.
10. resonance converter as claimed in claim 6, wherein this charge pump circuit is made of at least one electric capacity, and this electric capacity is coupled to the primary side of this transformer.
11. resonance converter as claimed in claim 6, wherein this charge pump circuit is made of at least one electric capacity, and this electric capacity is coupled to the part of this Circuit Fault on Secondary Transformer at least.
12. the startup method of the intermittent operation mode of a resonance converter, this resonance converter comprises the change-over circuit level, the output of this change-over circuit level is induced to the transformer of secondary side by primary side, the output of this transformer is carried out the rectification circuit level of rectification, the output of this rectification circuit level is carried out the filtering and the load circuit level of filtering and output, and with at least one composed component coupled in parallel of this rectification circuit level or the charge pump circuit that couples mutually with the primary side or the secondary side of this transformer, wherein this composed component is a semiconductor device, and this startup method comprises the following steps:
Utilize this charge pump circuit to the charging of this filtering and load circuit level, to being higher than predetermined value, make the feedback voltage that this resonance converter had change with the current potential that promotes this filtering and load circuit level; And
Make this resonance converter start intermittent operation mode according to this variation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200610128094A CN100578903C (en) | 2006-09-01 | 2006-09-01 | Resonant converter and intermittent operation mode starting method |
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| CN200610128094A CN100578903C (en) | 2006-09-01 | 2006-09-01 | Resonant converter and intermittent operation mode starting method |
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| CN101136592A CN101136592A (en) | 2008-03-05 |
| CN100578903C true CN100578903C (en) | 2010-01-06 |
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Families Citing this family (3)
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| CN101997421B (en) * | 2009-08-14 | 2014-08-27 | 台达电子工业股份有限公司 | Resonant converter provided with overcurrent protection device and control method thereof |
| US9331565B2 (en) | 2010-07-14 | 2016-05-03 | Delta Electronics (Shanghai) Co., Ltd. | Switching power conversion circuit and power supply using same |
| CN103856079B (en) * | 2012-11-28 | 2017-02-08 | 台达电子企业管理（上海）有限公司 | Switching power-conversion circuit and power supply device for the same |
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