CN102638184A - High-efficiency alternating current-direct current voltage converting circuit - Google Patents
High-efficiency alternating current-direct current voltage converting circuit Download PDFInfo
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- CN102638184A CN102638184A CN201210129976XA CN201210129976A CN102638184A CN 102638184 A CN102638184 A CN 102638184A CN 201210129976X A CN201210129976X A CN 201210129976XA CN 201210129976 A CN201210129976 A CN 201210129976A CN 102638184 A CN102638184 A CN 102638184A
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Abstract
The invention discloses a high-efficiency alternating current-direct current voltage converting circuit. By adopting the high-efficiency alternating current-direct current voltage converting circuit, a two-stage structure is used for converting an input alternating current power supply into a constant current for output; when the high-efficiency alternating current-direct current voltage converting circuit is in a first working state, the alternating current power supply provides power for a load by generating electric signals through two stages of voltage converting circuits in sequence; and when the high-efficiency alternating current-direct current voltage converting circuit is in a second working state, the output of the first-stage voltage converting circuit is controlled to be matched with an expected electric signal so as to provide power for the load and improve the conversion efficiency of the circuit. Because a topological structure of the second-stage voltage converting circuit preferably is a step-down type converter, the requirement on the capacitance value of the output capacitance of the second-stage voltage converting circuit is low and can be met without an electrolytic capacitor, and the cost is reduced; moreover, a flyback converter in the alternating current-direct current voltage converting circuit preferably adopts a primary side control mode without an opto-coupler element and the like, so that the integration of the circuit is facilitated. Therefore, the alternating current-direct current voltage converting circuit has the advantages of being high in efficiency, easy in integration and low in cost.
Description
Technical field
The present invention relates to field of switch power, in particular, relate to a kind of high efficiency AC-DC voltage conversion circuit.
Background technology
Two-layer configuration relatively more commonly used comprises pfc circuit and inverse excitation type converter in the AC-DC voltage conversion circuit at present.With reference to figure 1, be the theory diagram of the two-stage type AC-DC voltage conversion circuit formed by pfc circuit and inverse excitation type converter in the prior art.Wherein the previous stage pfc circuit is in order to improving power factor, and then improves the operating efficiency of power supply, and then the inverse excitation type converter of level transfers to secondary in order to the output voltage with prime through isolated topological structure.But adopt the booster type circuit usually owing to have the AC/DC circuit of PFC function; Its output voltage is higher than input voltage; The higher wide output voltage range field of input voltage is fashionable being used for, and will cause output voltage further to improve, so the diode D among some circuit devcie such as Fig. 1
1, switching tube Q
1, switching tube Q
2And capacitor C
1All need adopt high pressure resistant device, in addition, capacitor C
1Stored energy capacitance also can increase, so cost is higher; No matter how load changes in addition, and its two-stage type structure is in running order always, and the conversion efficiency of circuit is difficult to improve.
Summary of the invention
In view of this; The object of the present invention is to provide a kind of high efficiency AC-DC voltage conversion circuit; It utilizes two-layer configuration to convert the AC power of importing into a constant direct current and exports; When first operating state, it is electric that said AC power produces the signal of telecommunication through the two-stage voltage conversion circuit successively; When second operating state, the output of control first order voltage conversion circuit is thought electric with expectation signal of telecommunication coupling, to improve the conversion efficiency of circuit.Because the topological structure of second level voltage conversion circuit is preferably buck convertor, lower to the appearance value requirement of its output capacitance, need not to adopt electrochemical capacitor can reach requirement, reduced cost; In addition, the inverse excitation type converter in the AC-DC voltage conversion circuit preferably adopts former limit control mode, and need not to adopt optic coupling element etc., and it is integrated therefore to help circuit.Adopt thus according to AC-DC voltage conversion circuit of the present invention and have high efficiency, easy of integration, advantage cheaply.
A kind of high efficiency AC-DC voltage conversion circuit according to one embodiment of the invention comprises: first order voltage conversion circuit and second level voltage conversion circuit, wherein,
Said first order voltage conversion circuit is the isolated form topological structure with power factor emendation function, in order to convert the AC power that receives into first output voltage;
Said second level voltage conversion circuit is the non-isolation type topological structure, converts a constant signal of telecommunication in order to said first output voltage that will receive;
When first operating state, after said AC power is passed through first order voltage conversion circuit and second level voltage conversion circuit successively, produce the said constant signal of telecommunication and drive follow-up load;
When second operating state; Said second level voltage conversion circuit does not carry out the voltage transitions operation; Said first order voltage conversion circuit carries out voltage transitions according to the current expectation signal of telecommunication with said AC power, so that the output signal of telecommunication of said first order voltage conversion circuit and the said current expectation signal of telecommunication are complementary.
Further, said first order voltage conversion circuit comprises a rectifier bridge, an inverse excitation type converter and a power factor correction control circuit; Wherein, said rectifier bridge is connected with said AC power, said AC power is converted into a direct current voltage;
Said inverse excitation type converter is connected with said power factor correction control circuit with said rectifier bridge respectively, and to receive said direct voltage, said power factor correction control circuit is controlled the input voltage and the input current same-phase of said inverse excitation type converter.
Preferably, when second operating state, through feedback voltage or its fiducial value of regulating the feedback circuit in the said first order voltage conversion circuit, so that the output signal of telecommunication of said first order voltage conversion circuit and the said current expectation signal of telecommunication are complementary.
Preferably, when first operating state, said second level voltage conversion circuit is operated in the PWM pattern, keeps the constant of the output signal of telecommunication through the duty ratio of control switch pipe; When second operating state, the input of said second level voltage conversion circuit and the branch road between the output keep pass-through state, and other branch roads keep off state to stop the voltage transitions operation.
Preferably, the topological structure of said second level voltage conversion circuit is the asynchronous reduction voltage circuit of non-isolation type, and when second operating state, its master power switch is guaranteed and held conducting state.
Preferably, the topological structure of said second level voltage conversion circuit is a non-isolation type synchronous buck circuit, and when second operating state, its master power switch guarantees and hold conducting state that the synchronizing power switching tube keeps off state.
Further, said AC-DC voltage conversion circuit further comprises selects circuit, pwm control circuit and linear regulating circuit,
When first operating state, said selection circuit selects said pwm control circuit to control the switch motion of switching tube in the voltage conversion circuit of the said second level;
When second operating state, said selection circuit selects said linear regulating circuit to control the switch motion of switching tube in the voltage conversion circuit of the said second level.
Further, said AC-DC voltage conversion circuit further comprises, pwm control circuit, testing circuit and logical circuit;
Wherein, said testing circuit is exported a useful signal when second operating state; The useful signal of the pwm control signal of said pwm control circuit output and the output of said testing circuit is controlled the on off state of switching tube in the voltage conversion circuit of the said second level through said logical circuit.
Preferably, said inverse excitation type converter adopts former limit control mode, and the output voltage of the auxiliary winding through the said inverse excitation type converter of sampling is controlled the operating state of said inverse excitation type converter.
Preferably; Said inverse excitation type converter further comprises a former limit switching tube; The former limit of said inverse excitation type converter is connected with said former limit switching tube, and said power factor correction control circuit adopts the quasi-resonance control mode to control the switch motion of said former limit switching tube.
Description of drawings:
Shown in Figure 1 is the theory diagram of existing a kind of two-stage type AC-DC voltage conversion circuit.
Shown in Figure 2 is the circuit diagram of first embodiment of foundation a kind of AC-DC voltage conversion circuit of the present invention;
Shown in Figure 3 is the circuit diagram of second embodiment of foundation a kind of AC-DC voltage conversion circuit of the present invention;
Shown in Figure 4 is the circuit diagram of the 3rd embodiment of foundation a kind of AC-DC voltage conversion circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing several preferred embodiments of the present invention is described in detail, but the present invention is not restricted to these embodiment.The present invention contain any on marrow of the present invention and scope, make substitute, modification, equivalent method and scheme.Understand for the public is had completely the present invention, in the following preferred embodiment of the present invention, specified concrete details, and do not had the description of these details also can understand the present invention fully for a person skilled in the art.
With reference to figure 2, be depicted as circuit diagram according to first embodiment of a kind of AC-DC voltage conversion circuit of the present invention; It comprises first order voltage conversion circuit and second level voltage conversion circuit.
Wherein, said first order voltage conversion circuit is the isolated form topological structure with power factor emendation function, and it specifically comprises a rectifier bridge, an inverse excitation type converter and a power factor correction control circuit; Wherein, said rectifier bridge is connected with said AC power, said AC power is converted into a direct current voltage;
Said inverse excitation type converter is connected with said power factor correction control circuit with said rectifier bridge respectively, to receive said direct voltage; One former limit switching tube S
1Be connected with the former limit of said inverse excitation type converter, said power factor correction control circuit is controlled said former limit switching tube S
1Switch motion, with input voltage and the input current same-phase that reaches said inverse excitation type converter, improve the purpose of power factor.The secondary output of said inverse excitation type converter is through an output diode D
1With an output capacitance C
Out1After, obtain first output voltage V
Out1
Said second level voltage conversion circuit is the non-isolation type topological structure, specifically comprises a DC to DC converter in the present embodiment, in order to said first output voltage V that will receive
Out1Convert a constant DC into and press V
OutOutput.
In order to improve the conversion efficiency of entire circuit; When first operating state; When being said AC-DC voltage conversion circuit operate as normal, after said AC power is passed through said first order voltage conversion circuit and second level voltage conversion circuit successively, producing constant DC voltage and drive follow-up load; Voltage conversion circuit can be operated in the PWM pattern in the second level described in the practical application.
When second operating state; Be that said AC-DC voltage conversion circuit is when being operated in holding state; Said second level voltage conversion circuit makes the branch road between input and the output keep conducting through logic control or Linear Control, and other branch roads turn-off to stop the voltage transitions operation, and said first order voltage conversion circuit carries out voltage transitions according to the expectation signal of telecommunication when the front wheel driving load to said AC power; Make the signal of telecommunication and expectation signal of telecommunication coupling of its output, think electric.
Here need to prove said former limit switching tube S
1Control, its control model is not limit, the peak current control model, any appropriate control patterns such as permanent ON time control, average-current mode control, Cycle Control all are applicable to the present invention.And the topological structure of second level voltage conversion circuit also can be conventional non-isolation type topology such as buck, boost, cuk, zeta or sepic, and it is all within protection scope of the present invention.
In practical application; To be applied in the 12V constant voltage source of television set according to AC-DC voltage conversion circuit of the present invention; With said second level voltage conversion circuit is that a buck convertor is an example; First order voltage conversion circuit output one direct voltage greater than 12V wherein can provide a stable 12V output voltage up to specification through the DC converting of second voltage conversion circuit.Utilizing the efficient of two-stage type structure entire circuit shown in Figure 1 is 82.7%, and utilizes when realizing according to AC-DC voltage conversion circuit of the present invention, its improved efficiency to 88.4%, and cost has descended 37%.This shows to adopt and have high efficiency, advantage cheaply according to AC-DC voltage conversion circuit of the present invention.
With reference to figure 3, be depicted as circuit diagram according to second embodiment of a kind of AC-DC voltage conversion circuit of the present invention; In this embodiment, further comprise selection circuit, pwm control circuit and linear regulating circuit; The topological structure of said second level voltage conversion circuit is preferably the asynchronous reduction voltage circuit of non-isolation type, and it is by master power switch pipe S
2, diode D
2, inductance L
1, and output capacitance C
Out2Form, be output as a direct current voltage V
Out
When first operating state, the control mode of the inverse excitation type converter in the said first order voltage conversion circuit is secondary control, divider resistance R
11And resistance R
12Be connected in series and receive said first output voltage V
Out1, a switching tube S
3And resistance R
13Be connected to ground and with said resistance R
12Parallel connection; When first operating state, said switching tube S
3Conducting, said first output voltage V
Out1Through resistance R
11And resistance R
12, R
13Behind the electric resistance partial pressure of parallel connection equivalence, feed back to control chip 301 to control former limit switching tube S through optical coupler again
1Switch motion, convert the AC power that receives into said first output voltage V
Out1Said selection circuit receives the information that characterizes load condition to select said pwm control circuit to control said master power switch pipe S when first operating state
2Switch motion, to guarantee the follow-up electric that is input as of said second level voltage conversion circuit.
When second operating state, said selection circuit selects said linear regulating circuit to control said master power switch pipe S
2Keep conducting state; This moment, said asynchronous reduction voltage circuit was ended the voltage transitions operation; For guaranteeing that this moment, first order voltage conversion circuit can carry out voltage transitions to said AC power according to the expectation supply power voltage of load; Need to regulate the feedback voltage of said first order voltage conversion circuit, realize in the following manner in the present embodiment: said linear regulating circuit is exported a useful signal, through the said switching tube S of control after the anti-phase
3Turn-off, at this moment said first output voltage V
Out1Through resistance R
11And resistance R
12Dividing potential drop because the connection of divider resistance changes, causes characterizing said first output voltage V
Out1Feedback signal corresponding become big, through to former limit switching tube S
1The control of duty ratio, cause said first output voltage V
Out1Descend to some extent during than operate as normal, through inductance L
1With output capacitance C
Out2Filtering after, can be said load normal power supply.
Because the output voltage of reduction voltage circuit is lower than input voltage, therefore lower to the appearance value requirement of its output capacitance, need not to adopt electrochemical capacitor can reach requirement, reduced cost.In addition, its broader bandwidth of reduction voltage circuit can effectively be eliminated the harmonic wave of first voltage conversion circuit output, and then reduce output capacitance C
Out1The requirement of appearance value, make the electric capacity of the said first voltage conversion circuit output need not adopt electrochemical capacitor to meet the demands.
Here need to prove; In the embodiment shown in fig. 3; The feedback voltage of the feedback circuit through regulating said first order voltage conversion circuit is so that the output signal of telecommunication of said first order voltage conversion circuit and expectation signal of telecommunication coupling; In practical application, also can reach same technique effect through regulating the corresponding fiducial value of feedback voltage, equally within protection scope of the present invention.
In addition; Said second level voltage conversion circuit adopts the non-isolation type topological structure; Its concrete realization also is not limited to asynchronous reduction voltage circuit, and other are like synchronous reduction voltage circuit, and any suitable non-isolation type topologys such as asynchronous booster circuit, synchronous buck circuit are all applicable.Accordingly; For input and the branch road between the output that guarantees said second level voltage conversion circuit keeps pass-through state; Other branch roads keep off state to stop the voltage transitions operation; When second operating state, the master power switch in the synchronous buck circuit guarantees and holds conducting state, and synchro switch is guaranteed and held off state; When adopting asynchronous booster circuit, its master power switch is guaranteed and is held off state; When adopting synchronous voltage booster circuit, its master power switch guarantees and holds off state, and synchro switch is guaranteed and held conducting state.
Inverse excitation type converter adopts the secondary control mode in embodiment illustrated in fig. 3, utilizes optical coupler to carry out the feedback signal sampling, and is integrated not only bad for circuit; The volume and the cost of circuit have been increased simultaneously; In the embodiment shown in fig. 4, said inverse excitation type converter adopts former limit control mode, and the output voltage of the auxiliary winding through the said inverse excitation type converter of sampling is controlled the operating state of said inverse excitation type converter; And need not to adopt optic coupling element etc., it is integrated therefore to help circuit.And the topological structure of said second level voltage conversion circuit is preferably non-isolation type synchronous buck circuit, and further comprise pwm control circuit, testing circuit and logical circuit; Wherein said detection signal is exported a useful signal when second operating state; The useful signal of the pwm control signal of said pwm control circuit output and the output of said testing circuit is controlled the switch motion of the switching tube in the voltage conversion circuit of the said second level through said logical circuit.
When first operating state, inverse excitation type converter adopts former limit control mode in the said first order voltage conversion circuit, and to said former limit switching tube S
1Control be preferably the quasi-resonance control mode.And said logical circuit is controlled master power switch pipe S in the said synchronous buck circuit according to said pwm control signal
4And synchro switch pipe S
5Switch motion;
When second operating state, said logical circuit is controlled said master power switch pipe S according to the useful signal of said testing circuit output
4Keep conducting state, and synchro switch pipe S
5Keep off state.Simultaneously said useful signal is controlled said switching tube S through anti-phase
3Turn-off, at this moment said first output voltage V
Out1Through resistance R
21And resistance R
22Dividing potential drop because the connection of divider resistance changes, causes characterizing said first output voltage V
Out1Feedback signal corresponding become big, through to former limit switching tube S
1The control of duty ratio, cause said first output voltage V
Out1Descend to some extent during than operate as normal, can be said load normal power supply.
More than the AC-DC voltage conversion circuit according to the preferred embodiments of the present invention is described, these embodiment do not have all details of detailed descriptionthe, do not limit this invention yet and are merely described specific embodiment.Obviously, according to above description, can do a lot of modifications and variation.The relevant improvement that those skilled in the art are done on the basis of the disclosed circuit of the embodiment of the invention, the combination of a plurality of embodiment; And adopt other technologies, circuit layout or element and the circuit structure of the identical function realized, also within the protection range of the embodiment of the invention.The present invention only receives the restriction of claims and four corner and equivalent.
Claims (10)
1. a high efficiency AC-DC voltage conversion circuit is characterized in that, comprising: first order voltage conversion circuit and second level voltage conversion circuit, wherein,
Said first order voltage conversion circuit is the isolated form topological structure with power factor emendation function, in order to convert the AC power that receives into first output voltage;
Said second level voltage conversion circuit is the non-isolation type topological structure, converts a constant signal of telecommunication in order to said first output voltage that will receive;
When first operating state, after said AC power is passed through first order voltage conversion circuit and second level voltage conversion circuit successively, produce the said constant signal of telecommunication and drive follow-up load;
When second operating state; Said second level voltage conversion circuit does not carry out the voltage transitions operation; Said first order voltage conversion circuit carries out voltage transitions according to the current expectation signal of telecommunication with said AC power, so that the output signal of telecommunication of said first order voltage conversion circuit and the said current expectation signal of telecommunication are complementary.
2. AC-DC voltage conversion circuit according to claim 1 is characterized in that, said first order voltage conversion circuit comprises a rectifier bridge, an inverse excitation type converter and a power factor correction control circuit; Wherein, said rectifier bridge is connected with said AC power, said AC power is converted into a direct current voltage;
Said inverse excitation type converter is connected with said power factor correction control circuit with said rectifier bridge respectively, and to receive said direct voltage, said power factor correction control circuit is controlled the input voltage and the input current same-phase of said inverse excitation type converter.
3. AC-DC voltage conversion circuit according to claim 1; It is characterized in that; When second operating state; Through feedback voltage or its fiducial value of regulating the feedback circuit in the said first order voltage conversion circuit, so that the output signal of telecommunication of said first order voltage conversion circuit and the said current expectation signal of telecommunication are complementary.
4. AC-DC voltage conversion circuit according to claim 1 is characterized in that, when first operating state, said second level voltage conversion circuit is operated in the PWM pattern, keeps the constant of the output signal of telecommunication through the duty ratio of control switch pipe; When second operating state, the input of said second level voltage conversion circuit and the branch road between the output keep pass-through state, and other branch roads keep off state to stop the voltage transitions operation.
5. AC-DC voltage conversion circuit according to claim 4 is characterized in that, the topological structure of said second level voltage conversion circuit is the asynchronous reduction voltage circuit of non-isolation type, and when second operating state, its master power switch is guaranteed and held conducting state.
6. AC-DC voltage conversion circuit according to claim 4; It is characterized in that; The topological structure of said second level voltage conversion circuit is a non-isolation type synchronous buck circuit; When second operating state, its master power switch guarantees and holds conducting state that the synchronizing power switching tube keeps off state.
7. according to claim 5 or 6 described AC-DC voltage conversion circuits, it is characterized in that, further comprise and select circuit, pwm control circuit and linear regulating circuit,
When first operating state, said selection circuit selects said pwm control circuit to control the switch motion of switching tube in the voltage conversion circuit of the said second level;
When second operating state, said selection circuit selects said linear regulating circuit to control the switch motion of switching tube in the voltage conversion circuit of the said second level.
8. according to claim 5 or 6 described AC-DC voltage conversion circuits, it is characterized in that: further comprise pwm control circuit, testing circuit and logical circuit;
Wherein, said testing circuit is exported a useful signal when second operating state; The useful signal of the pwm control signal of said pwm control circuit output and the output of said testing circuit is controlled the on off state of switching tube in the voltage conversion circuit of the said second level through said logical circuit.
9. AC-DC voltage conversion circuit according to claim 2; It is characterized in that; Said inverse excitation type converter adopts former limit control mode, and the output voltage of the auxiliary winding through the said inverse excitation type converter of sampling is controlled the operating state of said inverse excitation type converter.
10. AC-DC voltage conversion circuit according to claim 2; It is characterized in that; Said inverse excitation type converter further comprises a former limit switching tube; The former limit of said inverse excitation type converter is connected with said former limit switching tube, and said power factor correction control circuit adopts the quasi-resonance control mode to control the switch motion of said former limit switching tube.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210129976XA CN102638184A (en) | 2012-04-27 | 2012-04-27 | High-efficiency alternating current-direct current voltage converting circuit |
| TW102109050A TWI489762B (en) | 2012-04-27 | 2013-03-14 | High efficiency AC - DC voltage conversion circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210129976XA CN102638184A (en) | 2012-04-27 | 2012-04-27 | High-efficiency alternating current-direct current voltage converting circuit |
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| CN102638184A true CN102638184A (en) | 2012-08-15 |
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| CN201210129976XA Pending CN102638184A (en) | 2012-04-27 | 2012-04-27 | High-efficiency alternating current-direct current voltage converting circuit |
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| CN105356769A (en) * | 2015-11-13 | 2016-02-24 | 苏州扬佛自动化设备有限公司 | Step-up and step-down control method of switching power supply |
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| CN105356769A (en) * | 2015-11-13 | 2016-02-24 | 苏州扬佛自动化设备有限公司 | Step-up and step-down control method of switching power supply |
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| CN110784114A (en) * | 2019-11-14 | 2020-02-11 | 杭州必易微电子有限公司 | Voltage conversion circuit and conversion method for non-isolated AC-DC voltage conversion system |
| US20210203231A1 (en) * | 2019-12-31 | 2021-07-01 | Viza Electronics Pte. Ltd. | Low-power mode for power supply with two-stage driver |
| WO2022073381A1 (en) * | 2020-10-09 | 2022-04-14 | 海信视像科技股份有限公司 | Power supply circuit and working method thereof |
| CN115250558A (en) * | 2022-04-22 | 2022-10-28 | 杰华特微电子股份有限公司 | Power supply circuit and LED driving system applying same |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI489762B (en) | 2015-06-21 |
| TW201401753A (en) | 2014-01-01 |
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Application publication date: 20120815 |