CN1845436A - Method and device for controlling resonant transformer - Google Patents
Method and device for controlling resonant transformer Download PDFInfo
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- CN1845436A CN1845436A CNA2006100602425A CN200610060242A CN1845436A CN 1845436 A CN1845436 A CN 1845436A CN A2006100602425 A CNA2006100602425 A CN A2006100602425A CN 200610060242 A CN200610060242 A CN 200610060242A CN 1845436 A CN1845436 A CN 1845436A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000010355 oscillation Effects 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 230000009123 feedback regulation Effects 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000001939 inductive effect Effects 0.000 description 5
- 238000010606 normalization Methods 0.000 description 5
- 230000009466 transformation Effects 0.000 description 4
- 230000010363 phase shift Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003079 width control Methods 0.000 description 1
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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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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The disclosed control method for a resonant converter comprises: in simple RV circuit way, connecting a resistance R1 on RT end of PWM chip with another end grounding, as well as another resistance Rf with another end connecting to output of feedback regulation; or there may be resistances R3 with ends connected to Vref end and Vcpwm end of PWM chip respectively and R4 with ends connected to Vcpwm end and output of feedback regulation respectively. Compared with prior art, this invention is simple and low cost.
Description
[technical field]
The present invention relates to a kind of power conversion technology, relate in particular to a kind of control method and device of controlled resonant converter.
[background technology]
Series resonant circuit and LLC series resonant circuit are to cause again that in recent years industry is paid attention to and the circuit of research, it is comparative maturity in theory, and on commercial Application, compare with phase-shifting full-bridge and have remarkable advantages, open and turn-off as the ZVS that in variable-frequency scope, realizes former limit MOSFET (field effect transistor); The ZCS of secondary diode turn-offs, and has eliminated the due to voltage spikes and the turn-off power loss of secondary; Can make circuit that higher efficient is arranged, lower EMI characteristic; And can be operated in higher switching frequency, thereby can reduce the volume and the cost of Switching Power Supply; And its primary current is sinusoidal wave, and conduction and radiation are little etc.Below series resonant circuit and LLC series resonant circuit are carried out some simple analysis:
Fig. 1 is the series resonant circuit in the typical prior art.When being higher than resonance frequency, can realize switching frequency the switch of ZVS.
Fig. 2 is the inductive current oscillogram that switching frequency is higher than resonance frequency in the series resonant circuit.Can obtain by the first-harmonic analysis
Fig. 3 is the normalization output voltage of series resonant circuit and the relation curve of frequency.Abscissa is
Ordinate is
Fig. 4 is typical LLC resonance equivalent circuit.This circuit has two kinds of working methods: switching frequency is higher than resonance frequency and switching frequency is lower than resonance frequency, and its inductive current waveform is shown in respectively among Fig. 5 and Fig. 6.Can obtain the relation of output voltage and switching frequency by fundamental Wave Analysis:
Fig. 7 is the normalization output voltage of LLC resonance equivalent circuit and the relation curve of frequency.
From the characteristic curve of the output voltage of top two kinds of analyses and switching frequency, can see that the output voltage of controlled resonant converter (normalization, output voltage is than input voltage) is relevant with load.Particularly when output voltage requires the excursion broad, require frequency range very big.And when output loading hour, the distributed capacitance in the transformer etc. has participated in circuit working, at this moment, output voltage can not adopt the formula of fundamental Wave Analysis, it has higher magnitude of voltage.Therefore underloading control is exactly the problem that exists in the series resonant converter all the time, promptly when underloading, the too high stability that can influence circuit working that frequency rises, circuit working state can not satisfy the principle of LLC series resonance preferably, so the requirement of output voltage stabilizing when simple frequency modulation control can't reach underloading and zero load is for addressing these problems, can adopt a lot of methods, control, decide methods such as pulsewidth accent cycle as intermittently control, PWM.
As previously mentioned, be the adjustable range that realizes that output is bigger, and solve the unloaded problem that exists of resonant circuit, a good method is PWM (pulse-width modulation)+variable frequency control.When the feedback regulator output valve is big, adopt variable frequency adjustment, when feedback regulator output hour, adopt PWM to regulate, the requirement of its PWM+ variable frequency control as shown in Figure 8.Existingly carry out frequency conversion+PWM regulative mode as shown in Figure 9, adopted frequency conversion and PWM two cover circuit to switch, circuit is very complicated, implements trouble, and cost is higher.For example Chinese patent CN1555128A discloses a kind of frequency conversion+phase-shifting control method, and this method adopts the frequency modulation control mode when heavy duty, adopts phase-shift control mode during underloading.The separation of frequency modulation and phase shift is judged according to linear scale-integral controller output result.Adopt the frequency modulation control mode during greater than certain determined value, adopt phase-shift control mode when being worth less than this.Though this method can satisfy the requirement of voltage stabilizing, and also reduced the excessive problem of circuit loss,, circuit is relatively complicated, and cost is higher.
[summary of the invention]
In order to overcome existing technological deficiency, the invention provides a kind of control method and device thereof of succinct controlled resonant converter, thereby can realize very easily that underloading PWM regulates, the control mode of heavily loaded variable frequency adjustment.
One of purpose of the present invention provides a kind of control device of controlled resonant converter, the feature of this control device adopts simple R C circuit to realize that simultaneously underloading PWM regulates and the control of heavily loaded variable frequency adjustment, the frequency of oscillation that is included in the PWM chip is set on the end and is connected with first resistance, the other end ground connection of first resistance; Connect second resistance more simultaneously on frequency of oscillation setting end, the other end of second resistance is connected to the feedback regulator output.
Further, the present invention also comprises the 3rd resistance (R3) and the 4th resistance (R4), the 3rd resistance (R3) end is connected to reference voltage (Vref) end of PWM chip, one end of the other end and the 4th resistance (R4) is connected to the PWM feedback input of chip together and compares (Vcpwm) end, and the other end of the 4th resistance R 4 is connected on the feedback regulator output.
The model of the PWM chip that further, is suitable for is UC3525, UC28025, TL494.
One of another object of the present invention provides a kind of control method of controlled resonant converter, and the frequency of the oscillator by changing the PWM chip realizes frequency conversion, thereby adopts simple R C circuit to realize that simultaneously frequency conversion and PWM regulate control.
Further, the present invention sets end to the output of the feedback of output voltage through the frequency of oscillation that is connected in pwm chip by a resistance, thereby changes the frequency of oscillation of PWM chip; When feedback is exported greater than particular value, realize variable frequency control, when feedback is exported less than particular value, realize that PWM controls.
Further, described RC circuit mode is included in the frequency of oscillation of PWM chip and sets first resistance that connects on the end RT end, the first resistance other end ground connection is set on the end RT end in frequency of oscillation simultaneously and is connect second resistance again, and the second resistance other end is connected to the feedback regulator output.
Further, described RC circuit also comprises the 3rd resistance and the 4th resistance, the 3rd resistance one end is connected to the Vref end of PWM chip, and an end of the other end and the 4th resistance is connected to the Vcpwm end of chip together, and the other end of the 4th resistance is connected to the feedback regulator output.
The invention solves the control problem of series resonance and distortion circuit thereof, its basic ideas are not to adopt voltage controlled oscillator to realize frequency conversion, but adopt the frequency of the oscillator by changing the PWM chip to realize frequency conversion, thereby adopt simple RC circuit mode to realize that simultaneously underloading PWM regulates and heavily loaded variable frequency adjustment is controlled.The control method of controlled resonant converter of the present invention and device are mainly used in resonant circuit control, and can be applied in all kinds of Switching Power Supplies.
[description of drawings]
Fig. 1 is typical series resonant circuit.
Fig. 2 is the inductive current oscillogram that switching frequency is higher than resonance frequency in the series resonant circuit.
Fig. 3 is the normalization output voltage of series resonant circuit and the graph of relation of frequency.
Fig. 4 is typical LLC resonance equivalent circuit diagram.
Fig. 5 is the inductive current oscillogram that switching frequency is higher than resonance frequency in the LLC resonance equivalent circuit.
Fig. 6 is the inductive current oscillogram that switching frequency is lower than resonance frequency in the LLC resonance equivalent circuit.
Fig. 7 is the normalization output voltage of LLC resonance equivalent circuit and the graph of relation of frequency.
Fig. 8 is traditional PWM+ variable frequency control schematic diagram.
Fig. 9 is traditional frequency conversion+PWM conversion schematic diagram.
Figure 10 is circuit theory diagrams of the present invention.
Figure 11 is the instance graph that the present invention uses on UC3525.
Figure 12 is the instance graph that the present invention uses on UC28025.
Figure 13 is the instance graph of using on TL494 of the present invention.
[embodiment]
Below in conjunction with drawings and Examples the present invention is further set forth:
As shown in figure 10, the present invention realizes that by the RC circuit principle of vibration is: produce a constant-current source by resistance, this constant-current source produces oscillating impulse by mirror image circuit.This image current has determined frequency of oscillation.Be exactly the information of feedback output to be made a return journey by a resistance influence the resonance frequency of pwm chip during specific implementation.Thereby allow pwm chip can not only carry out PWM control, and can carry out variable frequency control.
The principle that frequency adjustment is carried out in this invention is: set on the end RT end in the frequency of oscillation of PWM chip and be connected with a resistance R 1, resistance R 1 other end ground connection, set on the end RT end in frequency of oscillation simultaneously and connect a resistance R _ f again, this resistance R _ f other end is connected to feedback regulator output, so just can realize frequency adjustment; Concrete implementation is that feedback output is set end by the frequency of oscillation that a resistance is connected in pwm chip, thereby changes the frequency of oscillation of PWM chip.Realize variable frequency control in the time of so just being implemented in feedback output greater than particular value, and when feedback is exported less than particular value, realize PWM control.So just can add the Comprehensive Control of two kinds of methods of PWM chip realization by a RC circuit.
In the control method of above-mentioned resonance variator, described simple R C circuit mode can also comprise resistance R 3 and resistance R 4, resistance R 3 one ends are connected to the Vref end of PWM chip, one end of the other end and resistance R 4 is connected to the Vcpwm end of chip together, and the other end of resistance R 4 is connected on the feedback regulation output.
Its principle further can illustrate by following formula:
Vr＝((Vc-Vr)/Rf+if)R1
Circuit theory diagrams of the present invention carry out variable frequency adjustment as shown in figure 10 when feedback regulation is exported less than certain value, its duty ratio is constant to be maximum pulse width (being generally 50%).Carrying out PWM when feedback is exported greater than this value regulates.Suppose that for the PWM comparator its output duty cycle is that the voltage of maximum duty cycle is Vhalf, regulate and begin to carry out PWM when requiring the feedback output voltage, as shown in figure 10 for Vpwm.Then can describe by following formula:
Following formula is when beginning to carry out PWM when regulating, i.e. Vc=Vpwm, the Vcpmw=Vhalf of this moment.So being easy to find out when Vc＞Vpwm, we can satisfy Vcpwm＞Vhalf.Promptly when feeding back output valve greater than Vpwm, PWM relatively is output as maximum duty cycle output (being generally 50%).So just can guarantee that when carrying out variable frequency control the output of the pulsewidth of PWM is always maximum duty cycle output.
For further explaining this method, Figure 11, Figure 12 and Figure 13 are this resonant transformation apparatus and the application example of control method on UC3525, UC28025 and TL494 thereof.
The application on UC3525 of controlled resonant converter of the present invention and control method thereof, as shown in Figure 11, resonant transformation apparatus of the present invention is applied on the UC3525, and its control procedure is as follows:
Feedback output is being connected to feedback ratio than when holding by R4, be connected to the frequency of oscillation setting end RT of UC3525 again by a resistance R _ f, thereby changes the frequency of oscillation of UC3525.Like this when feedback output during greater than certain particular value, its control be exactly the PWM pulsewidth be the variable frequency control of maximum duty cycle.When feedback was exported less than certain particular value, its control was exactly the PWM pulse width control.By control device of the present invention, we just can realize frequency conversion and two kinds of Comprehensive Control of PWM simultaneously by a pwm chip like this.
The application on UC28025 of controlled resonant converter of the present invention and control method thereof, as shown in Figure 12, resonant transformation apparatus of the present invention is applied on the UC28025, and its control procedure and embodiment 1 are similar.
The application on TL494 of controlled resonant converter of the present invention and control method thereof, as shown in Figure 13, resonant transformation apparatus of the present invention is applied on the TL494, and its control procedure and embodiment 1 are similar.
Above embodiment is in order to illustrating best implementation of the present invention, but the present invention is not limited to this.The change that those of ordinary skill in the art makes according to such scheme can not break away from the present invention and adopt the frequency of the oscillator that changes the PWM chip to realize frequency conversion, thereby realizes that simultaneously variable frequency adjustment and PWM regulate control.
Claims (7)
1, a kind of control device of controlled resonant converter, it is characterized in that: adopt simple R C circuit to realize that simultaneously underloading PWM regulates and the control of heavily loaded variable frequency adjustment, the frequency of oscillation that is included in the PWM chip is set on the end and is connected with first resistance (R1), the other end ground connection of first resistance (R1); Connect second resistance (Rf) more simultaneously on frequency of oscillation setting end, the other end of second resistance (Rf) is connected to the feedback regulator output.
2, the control device of controlled resonant converter according to claim 1, it is characterized in that: also comprise the 3rd resistance (R3) and the 4th resistance (R4), the 3rd resistance (R3) end is connected to reference voltage (Vref) end of PWM chip, one end of the other end and the 4th resistance (R4) is connected to the PWM feedback input of chip together and compares (Vcpwm) end, and the other end of the 4th resistance R 4 is connected on the feedback regulator output.
3, the control device of controlled resonant converter according to claim 1 and 2 is characterized in that: the model of described PWM chip is UC3525, UC28025, TL494.
4, a kind of control method of controlled resonant converter is characterized in that: the frequency of the oscillator by changing the PWM chip realizes frequency conversion, thereby adopts simple R C circuit to realize that simultaneously frequency conversion and PWM regulate control.
5, the control method of controlled resonant converter according to claim 4 is characterized in that: by a resistance frequency of oscillation that the output of the feedback of output voltage is connected in pwm chip is set end, thereby change the frequency of oscillation of PWM chip; When feedback is exported greater than particular value, realize variable frequency control, when feedback is exported less than particular value, realize that PWM controls.
6, the control method of controlled resonant converter according to claim 4, it is characterized in that: described RC circuit mode is included in the frequency of oscillation of PWM chip and sets first resistance (R1) that connects on the end RT end, first resistance (R1) other end ground connection, set on the end RT end in frequency of oscillation simultaneously and connect second resistance (Rf) again, second resistance (Rf) other end is connected to the feedback regulator output.
7, according to the control method of claim 4,5 or 6 described resonance variators, it is characterized in that: described RC circuit also comprises the 3rd resistance (R3) and the 4th resistance (R4), the 3rd resistance (R3) end is connected to the Vref end of PWM chip, one end of the other end and the 4th resistance (R4) is connected to the Vcpwm end of chip together, and the other end of the 4th resistance (R4) is connected to the feedback regulator output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100602425A CN100464485C (en) | 2006-04-10 | 2006-04-10 | Method and device for controlling resonant transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100602425A CN100464485C (en) | 2006-04-10 | 2006-04-10 | Method and device for controlling resonant transformer |
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| CN1845436A true CN1845436A (en) | 2006-10-11 |
| CN100464485C CN100464485C (en) | 2009-02-25 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242700B (en) * | 2008-01-10 | 2012-01-11 | 合肥大明电子科技有限公司 | Intelligent light adjusting electronic rectifier |
| CN102629835A (en) * | 2012-04-10 | 2012-08-08 | 东莞市有有光电有限公司 | Inverter |
| CN102694483A (en) * | 2012-01-12 | 2012-09-26 | 河南科技大学 | LC (inductance/capacitance) resonance drive circuit for ultrasonic motor and control method of LC resonance drive circuit |
| CN103944396A (en) * | 2014-04-11 | 2014-07-23 | 燕山大学 | LLC resonance type three-port DC-DC converter and control method thereof |
| CN108075663A (en) * | 2016-11-07 | 2018-05-25 | 赤多尼科两合股份有限公司 | The control circuit of Switching Power Supply |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3758062B2 (en) * | 1997-11-28 | 2006-03-22 | 東洋電機製造株式会社 | Active filter control method |
| US6304466B1 (en) * | 2000-03-02 | 2001-10-16 | Northrop Grumman Corporation | Power conditioning for remotely mounted microwave power amplifier |
| CN100541992C (en) * | 2003-09-08 | 2009-09-16 | 艾默生网络能源有限公司 | The control method of series-resonant direct-current/direct-current converter and device |
| CN100379138C (en) * | 2003-12-19 | 2008-04-02 | 艾默生网络能源有限公司 | Control method and device for series resonant converter |
-
2006
- 2006-04-10 CN CNB2006100602425A patent/CN100464485C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242700B (en) * | 2008-01-10 | 2012-01-11 | 合肥大明电子科技有限公司 | Intelligent light adjusting electronic rectifier |
| CN102694483A (en) * | 2012-01-12 | 2012-09-26 | 河南科技大学 | LC (inductance/capacitance) resonance drive circuit for ultrasonic motor and control method of LC resonance drive circuit |
| CN102629835A (en) * | 2012-04-10 | 2012-08-08 | 东莞市有有光电有限公司 | Inverter |
| CN103944396A (en) * | 2014-04-11 | 2014-07-23 | 燕山大学 | LLC resonance type three-port DC-DC converter and control method thereof |
| CN108075663A (en) * | 2016-11-07 | 2018-05-25 | 赤多尼科两合股份有限公司 | The control circuit of Switching Power Supply |
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| Publication number | Publication date |
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| CN100464485C (en) | 2009-02-25 |
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Effective date of registration: 20070302 Address after: Room 208, Fangda building, South District, Nanshan District science and Technology Park, Shenzhen, Guangdong Applicant after: SHINRY TECHNOLOGIES Co.,Ltd. Address before: No. 208, Fangda building, twelve South tech Road, Shenzhen hi tech Industrial Park, Guangdong, China Applicant before: Wu Renhua |
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Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518055 No. 1001 Nanshan Chi Park C1 building 14 floor Patentee after: SHINRY TECHNOLOGIES Co.,Ltd. Address before: 518057, room 208, Fangda building, South District, Nanshan District science and Technology Park, Guangdong, Shenzhen Patentee before: SHINRY TECHNOLOGIES Co.,Ltd. |
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Denomination of invention: A control method and device for resonant converter Effective date of registration: 20220617 Granted publication date: 20090225 Pledgee: Shenzhen small and medium sized small loan Co.,Ltd. Pledgor: SHINRY TECHNOLOGIES Co.,Ltd. Registration number: Y2022440020095 |
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Granted publication date: 20090225 Pledgee: Shenzhen small and medium sized small loan Co.,Ltd. Pledgor: SHINRY TECHNOLOGIES Co.,Ltd. Registration number: Y2022440020095 |