CN109951062A - Resonance converter and control method for resonance converter - Google Patents
Resonance converter and control method for resonance converter Download PDFInfo
- Publication number
- CN109951062A CN109951062A CN201711395285.3A CN201711395285A CN109951062A CN 109951062 A CN109951062 A CN 109951062A CN 201711395285 A CN201711395285 A CN 201711395285A CN 109951062 A CN109951062 A CN 109951062A
- Authority
- CN
- China
- Prior art keywords
- resonance
- resonance converter
- output
- conversion unit
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
This disclosure relates to resonance converter and the control method for resonance converter.The resonance converter includes: resonance conversion unit, the synchronous rectifier connecting with the resonance conversion unit, feedback controller and feedforward controller, and the feedback controller is used to execute feedback control based on the output signal of the resonance converter；And the feedforward controller is used to execute feedforward control based on the synchronous control signal of the synchronous rectifier, will pass through the working frequency for pre-adjusting the resonance conversion unit to adjust the gain of the resonance converter, to reduce or eliminate the overshoot of the output voltage of the resonance converter.In addition, can be realized by preprogramming in the processor according to the control method for resonance converter of the disclosure to adapt to the transformation of load, without detecting the pressure drop of synchronous rectification MOSFET pipe, and do not need to increase additional control circuit.Therefore, hardware cost has been saved.
Description
Technical field
This disclosure relates to the technical field of converter, more particularly to resonance converter and for the control of resonance converter
Method.
Background technique
This part provides background information related with the disclosure, this is not necessarily the prior art.
In general, circuit of synchronous rectification can be used to improve efficiency in converter.However, the meeting in circuit of synchronous rectification starting
Output voltage is caused to overshoot.Therefore, the present disclosure proposes the control method of a kind of resonance converter and effective resonance converter,
The problem of to improve output voltage in the prior art overshoot.
Summary of the invention
This part provides the general summary of the disclosure, rather than its full scope or the comprehensive of its whole feature drape over one's shoulders
Dew.
The disclosure is designed to provide a kind of resonance converter and the control method for resonance converter, according to this public affairs
The resonance converter opened the working frequency of resonance converter can be pre-adjusted by feedforward controller reducing or eliminating because
Synchronous rectification MOSFET tube voltage drop variation and caused by output voltage overshoot.
According to the one side of the disclosure, a kind of resonance converter is provided, comprising: resonance conversion unit and the resonance
Synchronous rectifier, feedback controller and the feedforward controller of converting unit connection, the feedback controller are used for based on described humorous
The output signal of converter of shaking executes feedback control；And the feedforward controller is used for based on the same of the synchronous rectifier
Step control signal executes feedforward control, described to adjust will pass through the working frequency for pre-adjusting the resonance conversion unit
The gain of resonance converter, to reduce or eliminate the overshoot of the output voltage of the resonance converter.
Preferably, the resonance conversion unit is primary side L, the inductor L and capacitor C group of the transformer by being connected in series
At LLC harmonic conversion circuit.
Preferably, the feedforward controller while synchronous rectifier is connected or before control the harmonic conversion
The working frequency of unit.
Preferably, the synchronous rectifier is full-bridge rectifier.
It preferably, further comprise switch unit according to the resonance converter of the disclosure, the switch unit is for adjusting
The working frequency of the resonance conversion unit.
It preferably, further comprise digital signal processor according to the resonance converter of the disclosure, at the digital signal
Reason device is for controlling the switch unit.
Preferably, pre-programmed is carried out to the digital signal processor according to the case where output loading, so that the number
Signal processor controls the work frequency of the resonance converter based on the output of the feedback controller and the feedforward controller
Rate.
Preferably, pre-programmed is carried out to the digital signal processor so that the digital signal processor executes following step
Rapid: the control signal obtained under each of multiple output loadings output loading transmits letter to the first of the output signal
Number, the control signal are the difference of the output signal and reference signal；It is negative to obtain each of multiple output loadings output
Second transmission function of the synchronous control signal of synchronous rectifier under carrying to the output signal；Based on the first transmitting letter
Several and second transmission function, obtains the corresponding control parameter of the feedforward controller, to generate the feedforward controller
Control parameter list；The practical control of the feedforward controller is set based on reality output load and the control parameter list
Parameter；And the harmonic conversion list is arranged according to the sum of the output and the output of the feedback controller of the feedforward controller
The working frequency of member.
Preferably, according to the multiple load, the reality of the feedforward controller is obtained by known control parameter interpolation
Border control parameter.
According to another aspect of the present disclosure, a kind of resonance converter is provided, comprising: resonance conversion unit；Synchronous rectification
Device；And processor, the processor are programmed to execute following steps: by pre-adjusting the resonance conversion unit
Working frequency is to adjust the gain of the resonance converter, to reduce or eliminate the mistake of the output voltage of the resonance converter
Punching.
Preferably, the resonance conversion unit is primary side L, the inductor L and capacitor C group of the transformer by being connected in series
At LLC harmonic conversion circuit.
Preferably, the processor while synchronous rectifier is connected or before adjust the resonance conversion unit
Working frequency.
Preferably, the synchronous rectifier is full-bridge rectifier.
It preferably, further comprise switch unit according to the resonance converter of the disclosure, the switch unit is for adjusting
The working frequency of the resonance conversion unit.
Preferably, the processor is digital signal processor, and the digital signal processor is for controlling the switch
Unit.
Preferably, the digital signal processor is programmed so that its based on different load and/or it is described synchronize it is whole
The synchronous control signal of device is flowed to control the switch unit.
According to the another aspect of the disclosure, a kind of control method for resonance converter, the harmonic conversion are provided
Device includes resonance conversion unit and the synchronous rectifier that connect with the resonance conversion unit, and the control method includes: base
Feedback control is executed in the output signal of the resonance converter；And the synchronous control signal based on the synchronous rectifier
Feedforward control is executed, to will pass through the working frequency for pre-adjusting the resonance conversion unit to adjust the resonance converter
Gain, to reduce or eliminate the overshoot of the output voltage of the resonance converter.
It can change when each synchronous rectifier is connected using according to the control method for resonance converter of the disclosure
Become the voltage drop in diode of the working frequency of resonance converter especially LLC resonance converter to compensate synchronous rectifier,
And then prevent output voltage from overshooting.
Description and specific examples in this summary are intended merely to the purpose of signal, are not intended to limit the model of the disclosure
It encloses.
Detailed description of the invention
Attached drawing described here is intended merely to the purpose of the signal of selected embodiment and not all possible implementation, and not
It is intended to limit the scope of the present disclosure.In the accompanying drawings:
Fig. 1 shows the topological structure of the resonance converter of one embodiment according to the disclosure；
Fig. 2 shows the topological structures of resonance converter according to another embodiment of the present disclosure；
Fig. 3 is shown according to one embodiment of the disclosure before providing synchronous rectifier pulse width modulating signal
Resonance converter topological structure；
Fig. 4 is shown according to one embodiment of the disclosure when providing synchronous rectifier pulse width modulating signal
The topological structure of resonance converter；
Fig. 5 shows the transmission function block diagram of one embodiment according to the disclosure；
Fig. 6 shows transmission function block diagram according to another embodiment of the present disclosure；
Fig. 7 shows the gain curve of the resonance converter for different loads of one embodiment according to the disclosure；
And
The gain that Fig. 8 shows the resonance converter for a fixed load of one embodiment according to the disclosure is bent
Line.
Although the disclosure is subjected to various modifications and alternative forms, its specific embodiment is as an example in attached drawing
In show, and be described in detail here.It should be understood, however, that being not intended to the description of specific embodiment by this public affairs at this
Open and be restricted to disclosed concrete form, but on the contrary, disclosure purpose be intended to cover fall in spirit and scope of the present disclosure it
Interior all modifications, equivalent and replacement.It should be noted that running through several attached drawings, corresponding label indicates corresponding component.
Specific embodiment
It is described more fully the example of the disclosure referring now to the drawings.It is described below and is merely exemplary in nature,
It is not intended to limit the disclosure, application or purposes.
Example embodiment is provided below, so that the disclosure will become detailed, and will be to those skilled in the art
Fully communicate its range.The example of numerous specific details such as discrete cell, device and method is elaborated, to provide to this public affairs
The detailed understanding for the embodiment opened.It will be obvious that, do not need to those skilled in the art using specific details,
Example embodiment can be implemented with many different forms, they shall not be interpreted to limit the scope of the present disclosure.?
In certain example embodiments, well-known process, well-known structure and widely-known technique are not described in detail.
When the increase of voltage step (overshoot) is due to synchronous rectifier conducting, in the switch element in synchronous rectifier
The voltage at diode both ends declines suddenly, causes output voltage overshoot.
As shown in Figure 1 to Figure 3, there is control signal such as pulse in the driver 1 of synchronous rectifier 130 and driver 2
Before width modulated (PWM) signal, the inside of Metal Oxide Semiconductor Field Effect Transistor (MOSFET) Q1, Q2, Q3 and Q4
Diode D1, D2, D3 and D4 can be used as rectifier, as shown in Figure 3.The output voltage V of resonance converterO=VW-2*Vdiode,
Wherein, VWThe secondary-side voltage of indication transformer T1, and VdiodeIndicate the forward voltage of diode D1, D2, D3 or D4.
When such as pwm signal of driver 1 or driver 2 drives MOSFET Q1/Q4 or Q2/Q3, then will appear on Vo
Voltage overshoot, this is because 2*VdiodeSlow control loop response.
Then, when the PWM of driver 1 and driver 2 is closed, the internal diode D1/ of MOSFET Q1/Q4 and Q2/Q3
D4 and D2/D3 can be used as rectifier.
Next, when the PWM of driver 1 and driver 2 conducting, in the drain-source for considering MOSFETQ1, Q2, Q3 and Q4
Conducting resistance Rdson is as shown in figure 4, MOSFET Q1/Q4 and Q2/Q3 may be used as small impedance switch.
As shown in figure 4, I1=I2, Rdson1=Rdson2=Rdson3=Rdson4, then the output of resonance converter is electric
It presses Vo_1=Vw-I1* (Rdson1+Rdson2), wherein the secondary-side voltage of Vw indication transformer T1, I1 and I2 are respectively indicated
The electric current of MOSFET Q1/Q4 and Q2/Q3 is flowed through, and Rdson1, Rdson2, Rdson3, Rdson4 respectively indicate MOSFET
The drain-source conducting resistance of Q1, Q2, Q3 and Q4.
In the moment of synchronous PWM conducting, if (wherein, Vf is the interior of MOSFET to Vf > > I1*Rdson1, Vo_1 > > Vo
The forward voltage of portion's diode), it will there is the phenomenon that output voltage overshoot.
For such voltage overshoot, control method in the prior art be rectifier unlatching after or detecting it is defeated
Control, that is, conventional feedback are just executed after the voltage overshoot of outlet, as shown in figure 5, controller is defeated by comparing
Voltage Vo detects whether output voltage overshoots with reference voltage Vref out.Wherein, Io indicates load current, SYNC-ON
Indicate the on state of the control signal of synchronous rectifier.G1, G2, G3 are exemplarily only indicated with G6 to control signal and synchronous
The treatment process of rectified signal.
However, conventional feedback results in the mistake of output voltage due to very slow voltage feedback loop characteristic
It rushes larger, tends not to achieve the effect that needs.The present invention is directed on the basis of conventional feedback, be drawn using a kind of
Enter feed forward control method, as described in Figure 6, signal is controlled according to load (by detecting load current Io) and synchronous rectification
(SYNC-ON) state, look-ahead output voltage overshoot, also that is, by pre-adjust resonance converter working frequency come
Decrease or even eliminate output voltage overshoot.Similarly, G1 to G6 is exemplarily only indicated to control signal and synchronous rectification signal
Treatment process.
It can be a kind of composite control method according to the control method of the disclosure, while there is output voltage negative-feedback and do
Signal feedforward is disturbed, different from what is just controlled after synchronous rectifier is opened or after the voltage step for detecting output end
Normal feedback control method.
According to one embodiment of the disclosure, provide a kind of resonance converter, comprising: resonance conversion unit, with it is described
Synchronous rectifier, feedback controller and the feedforward controller of resonance conversion unit connection, the feedback controller are used to be based on institute
The output signal of resonance converter is stated to execute feedback control；And the feedforward controller is used to be based on the synchronous rectifier
Synchronous control signal execute feedforward control, to will pass through the working frequency for pre-adjusting the resonance conversion unit to adjust
The gain of the resonance converter, to reduce or eliminate the overshoot of the output voltage of the resonance converter.According to the disclosure
A preferred embodiment, the feedforward controller can while the synchronous rectifier is connected or before control it is described humorous
The working frequency for converting unit of shaking.
The electricity at output voltage can be being prevented when synchronous rectifier is connected using according to the resonance converter of the disclosure
Press step.
According to one embodiment of the disclosure, resonance conversion unit can be primary side L, the electricity of the transformer by being connected in series
The LLC harmonic conversion circuit of sensor L and capacitor C composition.As shown in Figure 1, resonance conversion unit 120 may include being connected in series
Transformer T1 primary side P1, inductor L1 and capacitor C2, to form LLC series resonance conversion circuit.
According to one embodiment of the disclosure, synchronous rectifier 130 for example can be shown in FIG. 1 positioned at transformer T1's
The full-bridge rectifier of the secondary side S1 being made of Metal Oxide Semiconductor Field Effect Transistor (MOSFET) Q1, Q2, Q3 and Q4.
According to one embodiment of the disclosure, Q1 and Q4 can be driven using identical sync driver 1, and Q2 and Q3 can be adopted
It is driven with identical sync driver 2.Here, it will be apparent to those skilled in the art that full-bridge rectifier shown in FIG. 1 only
To be illustrative, the disclosure is not limited to this.
According to one embodiment of the disclosure, resonance converter can also include that switch unit constitutes chopper, described to open
Close the working frequency that unit is used to adjust resonance conversion unit.As shown in Fig. 2, the resonance converter according to the disclosure may include
Switch unit 110, the switch unit 110 are located at the upstream of resonance conversion unit 120.Switch unit 110 can be same in conducting
The working frequency of resonance conversion unit 120 is adjusted while walking rectifier 130.Here, it will be apparent to those skilled in the art that opening
It closes unit 110 to be merely exemplary, switch unit can be arranged in those skilled in the art according to the actual needs.Selectively,
Those skilled in the art can also pass through the function of hardware or software realization switch unit according to the actual needs.
According to one embodiment of the disclosure, resonance converter can also include capacitor C1 for example shown in FIG. 1, described
Capacitor C1 can be connected across the output end of synchronous rectifier 130, be filtered peace for the output to synchronous rectifier 130
It is sliding.Here, it will be apparent to those skilled in the art that capacitor C1 is merely exemplary, those skilled in the art can be according to reality
The component for realizing similar functions is arranged in the needs on border.
According to one embodiment of the disclosure, resonance converter can be to load supplying.Resonance converter can be to load
Different output power (such as 0,10%, 20% ..., 100%) is provided.
According to one embodiment of the disclosure, resonance converter can also include that digital signal processor (DSP) (does not show
Out), the DSP is used for control switch unit 110.According to one embodiment of the disclosure, pre-programmed can be carried out to DSP, with
Make it based on the gain of resonance converter come control switch unit 110, and then adjusts the working frequency of resonance conversion unit 120.
According to one embodiment of the disclosure, pre-programmed can be carried out to DSP, so that it executes following steps: obtaining more
First transmission function of the control signal to output signal under each of a output loading output loading, the control signal
For the difference of the output signal and reference signal；Obtain the synchronous rectifier under each of multiple output loadings output loading
Synchronous control signal to the output signal the second transmission function；Based on first transmission function and second transmitting
Function obtains the corresponding control parameter of feedforward controller, to generate the control parameter list of the feedforward controller；Based on reality
Output loading and the control parameter list are arranged the practical control parameter of the feedforward controller；And according to the feedforward
The working frequency of the resonance conversion unit is arranged in the sum of output and the output of the feedback controller of controller.According to this public affairs
The preferred embodiment opened can obtain the feedforward control by known control parameter interpolation according to the multiple load
The practical control parameter of device processed.
For example, in setting resonance converter such as the Lm value of main transformer, inductance value Lr, the resonant capacitance of resonant inductor
After the key datas such as the capacitance Cr of device, resonance frequency fr and K value, the increasing of LLC converter as shown in Figure 7 can be obtained
Beneficial curve, wherein Y (x, Q, k, f) indicates LLC gain, and the equation (1) that can be expressed as.
Wherein, x indicates the working frequency of LLC, and Q isK is Lm/Lr, and f is LLC resonance frequency.Such as Fig. 7
It is shown, wherein to indicate different loads (such as 0,10%, 20%...100%) using different Q values.According to disclosure Fig. 7
Example, Q1:=0.4, Q2:=0.478, Q3:=0.376, Q4:=0.6, Q5:=0.28, Q6:=0.3, Q7:=0.193,
Q8:=0.367 and Q9:=0.1；K1:=6；And f1:=120kHZ, and the value range of the working frequency x of LLC is for example
It can be (the actual capabilities to 280kHz) from 40kHz to 270kHz.
From figure 7 it can be seen that even if under different loads, by changing the working frequency of LLC also available target
Gain (that is, available target output voltage).
According to one embodiment of the disclosure, for example, can choose Q3 (100% load) as an example, Fig. 8 is shown
When fixed Q3 (100% load) changes working frequency to 270kHz from 40kHz, the details of LLC gain.This
In, it will be apparent to those skilled in the art that the range of LLC working frequency is merely exemplary, those skilled in the art can root
It is set according to actual needs.According to the present invention design a model, actual operating frequency is from 70kHz to 260kHz.
As shown in figure 8, gain Y can be indicated are as follows:
Wherein, Q3 indicates 100% output loading, Q3:=0.39, k1:=6, and f1:=120kHz.
From figure 8, it is seen that, if to obtain the gain greater than 1, can be adjusted when output voltage is lower than normal voltage
Whole LLC working frequency x makes it be less than 120kHz.And when output voltage is higher than normal voltage, if it is desired that LLC gain is less than 1,
Then adjustable LLC working frequency x is larger than 120kHz.
In other words, the gain in gain curve and LLC working frequency are one-to-one.
It therefore, may include generating gain and list of frequency according to the control method for resonance converter of the disclosure,
The gain and list of frequency include the corresponding relationship of gain Yu LLC working frequency.It is described according to one embodiment of the disclosure
Gain and list of frequency can store in such as dsp chip with can be by searching institute in advance before synchronous rectifier is connected
It states gain and list of frequency and correct LLC working frequency is set in advance, so as to be quickly obtained required output voltage.
According to one embodiment of the disclosure, the working frequency that the resonance conversion unit 120 is arranged can be wrapped further
It includes: based on the gain and list of frequency, the working frequency of resonance conversion unit 120 being increased to corresponding level, is then led to
Crossing monitoring output voltage smoothly reduces working frequency.It here, it will be apparent to those skilled in the art that can be according to actual needs
The working frequency of resonance conversion unit 120 is elevated above gain and level corresponding in list of frequency.
It will be apparent to those skilled in the art that 100% load cited by the disclosure is merely exemplary, for other
The load of output power can be realized by the mode similar with 100% load.Details are not described herein for the disclosure.
In addition, the disclosure additionally provides a kind of resonance converter, comprising: resonance conversion unit；Synchronous rectifier；And place
Device is managed, the processor is programmed to execute following steps: the working frequency by pre-adjusting the resonance conversion unit
To adjust the gain of the resonance converter, to reduce or eliminate the overshoot of the output voltage of the resonance converter.
According to one embodiment of the disclosure, the resonance conversion unit is primary side L, the electricity of the transformer by being connected in series
The LLC harmonic conversion circuit of sensor L and capacitor C composition.
According to one embodiment of the disclosure, the processor while synchronous rectifier is connected or before adjust
The working frequency of the resonance conversion unit.
According to one embodiment of the disclosure, the synchronous rectifier is full-bridge rectifier.
According to one embodiment of the disclosure, the resonance converter further comprises switch unit, the switch unit
For adjusting the working frequency of the resonance conversion unit.
According to one embodiment of the disclosure, the processor is digital signal processor, the digital signal processor
For controlling the switch unit.
According to one embodiment of the disclosure, the digital signal processor is programmed, so that it is born based on different
It carries and/or the synchronous control signal of the synchronous rectifier controls the switch unit.
According to the another aspect of the disclosure, a kind of control method for resonance converter is additionally provided, the resonance turns
Parallel operation includes resonance conversion unit and the synchronous rectifier that connect with the resonance conversion unit, and the control method includes:
Feedback control is executed based on the output signal of the resonance converter；And the synchronously control letter based on the synchronous rectifier
Number feedforward control is executed, to will pass through the working frequency for pre-adjusting the resonance conversion unit to adjust the harmonic conversion
The gain of device, to reduce or eliminate the overshoot of the output voltage of the resonance converter.
According to one embodiment of the disclosure, the resonance conversion unit is primary side L, the electricity of the transformer by being connected in series
The LLC harmonic conversion circuit of sensor L and capacitor C composition.
According to one embodiment of the disclosure, while the synchronous rectifier is connected or before, control the resonance
The working frequency of converting unit.
According to one embodiment of the disclosure, the synchronous rectifier is full-bridge rectifier.
According to one embodiment of the disclosure, resonance converter further comprises switch unit, and the switch unit is used for
Adjust the working frequency of the resonance conversion unit.
According to one embodiment of the disclosure, resonance converter further comprises digital signal processor, the number letter
Number processor is for controlling the switch unit.
According to one embodiment of the disclosure, prelist according to the case where output loading to the digital signal processor
Journey, so that the digital signal processor controls the harmonic conversion based on the output of the feedback control and the feedforward control
The working frequency of device.
According to one embodiment of the disclosure, pre-programmed is carried out so that the digital signal to the digital signal processor
Processor executes following steps: the control signal obtained under each of multiple output loadings output loading is believed to the output
Number the first transmission function, it is described control signal be the output signal and reference signal difference；It obtains in multiple output loadings
Each output loading under synchronous rectifier synchronous control signal to the output signal the second transmission function；It is based on
First transmission function and second transmission function, obtain the corresponding control parameter of the feedforward controller, to generate
State the control parameter list of feedforward controller；The feedforward control is set based on reality output load and the control parameter list
The practical control parameter of device processed；And it is arranged according to the sum of the output and the output of the feedback controller of the feedforward controller
The working frequency of the resonance conversion unit.
According to one embodiment of the disclosure, according to the multiple load, by known control parameter interpolation to obtain
State the practical control parameter of feedforward controller.
Before the component of resonance converter according to an embodiment of the present disclosure and its various specific embodiments of control method
Detailed description had been made in face, and this will not be repeated here.
In the device and method of the disclosure, it is clear that each component or each step can be decomposed and/or be reconfigured.
These decompose and/or reconfigure the equivalent scheme that should be regarded as the disclosure.Also, the step of executing above-mentioned series of processes can be certainly
It so is executed in chronological order according to the sequence of explanation, but does not need centainly to execute sequentially in time.Certain steps can
To execute parallel or independently of one another.
Although embodiment of the disclosure is described in detail in conjunction with attached drawing above, it is to be understood that reality described above
The mode of applying is only intended to illustrate the disclosure, and does not constitute the limitation to the disclosure.For those skilled in the art, may be used
To make various changes and modifications the spirit and scope without departing from the disclosure to above embodiment.Therefore, the disclosure
Range is only limited by the attached claims and its equivalents.
Claims (17)
1. a kind of resonance converter, comprising: resonance conversion unit, the synchronous rectifier being connect with the resonance conversion unit, anti-
Controller and feedforward controller are presented,
The feedback controller is used to execute feedback control based on the output signal of the resonance converter；And
The feedforward controller is used to execute feedforward control based on the synchronous control signal of the synchronous rectifier, will pass through
The working frequency of the resonance conversion unit is pre-adjusted to adjust the gain of the resonance converter, to reduce or eliminate institute
State the overshoot of the output voltage of resonance converter.
2. resonance converter according to claim 1, wherein the resonance conversion unit is the transformer by being connected in series
Primary side L, inductor L and capacitor C composition LLC harmonic conversion circuit.
3. resonance converter according to claim 1 or 2, wherein the synchronous rectification is being connected in the feedforward controller
The working frequency of the resonance conversion unit is controlled while device or before.
4. resonance converter according to claim 3, wherein the synchronous rectifier is full-bridge rectifier.
5. resonance converter according to claim 3 further comprises switch unit, the switch unit is for adjusting institute
State the working frequency of resonance conversion unit.
6. resonance converter according to claim 5 further comprises digital signal processor, the Digital Signal Processing
Device is for controlling the switch unit.
7. resonance converter according to claim 6, wherein according to the case where output loading to the Digital Signal Processing
Device carries out pre-programmed, so that output control of the digital signal processor based on the feedback controller and the feedforward controller
Make the working frequency of the resonance converter.
8. resonance converter according to claim 7, wherein carry out pre-programmed so that institute to the digital signal processor
It states digital signal processor and executes following steps:
The control signal obtained under each of multiple output loadings output loading transmits letter to the first of the output signal
Number, the control signal are the difference of the output signal and reference signal；
The synchronous control signal of the synchronous rectifier under each of multiple output loadings output loading is obtained to the output
Second transmission function of signal；
Based on first transmission function and second transmission function, the corresponding control parameter of the feedforward controller is obtained,
To generate the control parameter list of the feedforward controller；
The practical control parameter of the feedforward controller is set based on reality output load and the control parameter list；And
According to the sum of the output of the feedforward controller and the output of the feedback controller setting resonance conversion unit
Working frequency.
9. resonance converter according to claim 8, wherein according to the multiple load, inserted by known control parameter
Value obtains the practical control parameter of the feedforward controller.
10. a kind of resonance converter, comprising:
Resonance conversion unit；
Synchronous rectifier；And
Processor, the processor are programmed to execute following steps:
By the working frequency of the pre-adjusting resonance conversion unit to adjust the gain of the resonance converter, to reduce
Or eliminate the overshoot of the output voltage of the resonance converter.
11. resonance converter according to claim 10, wherein the resonance conversion unit is the transformation by being connected in series
The LLC harmonic conversion circuit of primary side L, inductor L and capacitor the C composition of device.
12. resonance converter described in 0 or 11 according to claim 1, wherein the synchronous rectifier is being connected in the processor
While or adjust the working frequency of the resonance conversion unit before.
13. resonance converter according to claim 12, wherein the synchronous rectifier is full-bridge rectifier.
14. resonance converter according to claim 12 further comprises switch unit, the switch unit is for adjusting
The working frequency of the resonance conversion unit.
15. resonance converter according to claim 14, wherein the processor is digital signal processor, the number
Word signal processor is for controlling the switch unit.
16. resonance converter according to claim 15, wherein the digital signal processor is programmed, so that its
The switch unit is controlled based on the synchronous control signal of different loads and/or the synchronous rectifier.
17. a kind of control method for resonance converter, the resonance converter include resonance conversion unit and with it is described
The synchronous rectifier of resonance conversion unit connection, the control method include:
Feedback control is executed based on the output signal of the resonance converter；And
Feedforward control is executed based on the synchronous control signal of the synchronous rectifier, pre-adjusts the resonance turn will pass through
The working frequency of unit is changed to adjust the gain of the resonance converter, to reduce or eliminate the output of the resonance converter
The overshoot of voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711395285.3A CN109951062B (en) | 2017-12-21 | 2017-12-21 | Resonant converter and control method for resonant converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711395285.3A CN109951062B (en) | 2017-12-21 | 2017-12-21 | Resonant converter and control method for resonant converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109951062A true CN109951062A (en) | 2019-06-28 |
| CN109951062B CN109951062B (en) | 2022-07-26 |
Family
ID=67005825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711395285.3A Active CN109951062B (en) | 2017-12-21 | 2017-12-21 | Resonant converter and control method for resonant converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109951062B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201739A (en) * | 2011-05-27 | 2011-09-28 | 华北电力大学（保定） | Symmetrical half-bridge LLC resonant bidirectional DC-DC converter |
| CN102437628A (en) * | 2011-10-22 | 2012-05-02 | 华北电力大学（保定） | Storage battery reduction charge-discharge converter circuit |
| CN103840646A (en) * | 2012-11-23 | 2014-06-04 | 南京博兰得电子科技有限公司 | Resonant converting device |
| CN104300798A (en) * | 2013-07-17 | 2015-01-21 | 富士电机株式会社 | Control device of a switching power supply |
| CN104638895A (en) * | 2015-02-02 | 2015-05-20 | 华中科技大学 | Current-limiting method and current-limiting circuit of LLC resonant converter |
| CN104756389A (en) * | 2012-11-19 | 2015-07-01 | 苹果公司 | AC-DC resonant converter that provides high efficiency and high power density |
| CN105191097A (en) * | 2013-04-16 | 2015-12-23 | 华为技术有限公司 | Apparatus and method for resonant converters |
| US20160164410A1 (en) * | 2014-12-05 | 2016-06-09 | Broadcom Corporation | High efficiency dc-to-dc converter |
-
2017
- 2017-12-21 CN CN201711395285.3A patent/CN109951062B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201739A (en) * | 2011-05-27 | 2011-09-28 | 华北电力大学（保定） | Symmetrical half-bridge LLC resonant bidirectional DC-DC converter |
| CN102437628A (en) * | 2011-10-22 | 2012-05-02 | 华北电力大学（保定） | Storage battery reduction charge-discharge converter circuit |
| CN104756389A (en) * | 2012-11-19 | 2015-07-01 | 苹果公司 | AC-DC resonant converter that provides high efficiency and high power density |
| CN103840646A (en) * | 2012-11-23 | 2014-06-04 | 南京博兰得电子科技有限公司 | Resonant converting device |
| CN105191097A (en) * | 2013-04-16 | 2015-12-23 | 华为技术有限公司 | Apparatus and method for resonant converters |
| CN104300798A (en) * | 2013-07-17 | 2015-01-21 | 富士电机株式会社 | Control device of a switching power supply |
| US20160164410A1 (en) * | 2014-12-05 | 2016-06-09 | Broadcom Corporation | High efficiency dc-to-dc converter |
| CN104638895A (en) * | 2015-02-02 | 2015-05-20 | 华中科技大学 | Current-limiting method and current-limiting circuit of LLC resonant converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109951062B (en) | 2022-07-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7375994B2 (en) | Highly efficient isolated AC/DC power conversion technique | |
| CN108028605B (en) | Converter with hold-up operation | |
| US9065343B2 (en) | Resonant converter with auxiliary resonant components and holdup time control circuitry | |
| US7525293B1 (en) | Power supply switching circuit for a halogen lamp | |
| US9554431B2 (en) | LED driver | |
| CN105720825B (en) | System and method for switched-mode power supply | |
| US9450496B2 (en) | Multi-stage power converters and methods for varying a regulated voltage of one stage as a function of an output current of another stage | |
| US9755534B2 (en) | High efficiency high frequency resonant power conversion | |
| CN105191097B (en) | Apparatus and method for resonance converter | |
| US10224802B1 (en) | Methods for extending holdup times and/or reducing bulk capacitors in multi-stage switching power supplies | |
| CN105556821B (en) | The compact drive for being used in particular for light emitting diode with auxiliary output | |
| CN101588135A (en) | Resonant power factor correction converter | |
| US20230113753A1 (en) | Dc/dc converter and method for controlling output voltage thereof | |
| WO2012064755A1 (en) | Cascade power system architecture | |
| TWM449407U (en) | Power converting device | |
| CN104247239A (en) | Controlling a switched mode power supply with maximised power efficiency | |
| CN109120156A (en) | A kind of isolation BUCK-BOOST circuit and its control method | |
| US20070262753A1 (en) | Switching power supply with output ripple suppression | |
| CN207968329U (en) | A kind of LLC controller | |
| WO2020015292A1 (en) | Direct current-direct current converter, control method and control circuit therefor, and storage medium | |
| CN110214411A (en) | Simplification hybrid PWM/PFM control of SLLC converter | |
| CN114531033A (en) | Converter with a voltage detection circuit | |
| CN208401741U (en) | DC-DC converter | |
| CN109951062A (en) | Resonance converter and control method for resonance converter | |
| CN106664024A (en) | Switched mode power supply and method of operating a switched mode power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |