CN106787621B - Compensation circuit and the control circuit for applying it - Google Patents
Compensation circuit and the control circuit for applying it Download PDFInfo
- Publication number
- CN106787621B CN106787621B CN201611040473.XA CN201611040473A CN106787621B CN 106787621 B CN106787621 B CN 106787621B CN 201611040473 A CN201611040473 A CN 201611040473A CN 106787621 B CN106787621 B CN 106787621B
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- compensation
- input voltage
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- voltage
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
Abstract
Disclose a kind of compensation circuit and the control circuit using it, by feeding back input voltage to the compensation network to improve the compensation circuit for the response speed of input voltage, thus, it can be superimposed the variation of input voltage on the larger thermal compensation signal for postponing and input current being made preferably to follow input voltage, stablize to keep exporting for input voltage variation quick response while improving the power factor and total harmonic distortion factor of power inverter.
Description
Technical field
The present invention relates to power electronic technique, and in particular to a kind of compensation circuit and the control circuit using it.
Background technique
In the prior art, in the control loop of power inverter, it will usually adjust control loop by compensation circuit
In response to the speed that feedback parameters adjust, system can be made for the shake quick response of input voltage using fast ring,
To eliminate output current/voltage variation caused by input voltage shake.Fig. 1 is the schematic diagram of common compensation circuit, compensation
Circuit generally includes trsanscondutance amplifier GM and compensation network CP, and compensation network is made of compensating electric capacity C1 and compensation resistance R1.
Fig. 2 is the circuit diagram for applying the primary-side-control inverse excitation type converter of compensation circuit shown in FIG. 1, wherein control circuit packet
Include the peripheral circuit and integrated circuit die I C being made of resistance, capacitor, diode etc..Wherein, the COMP of integrated circuit draws
Foot corresponds to the output end of trsanscondutance amplifier GM.
In order to obtain faster response speed, it will usually set smaller value for compensating electric capacity C1 and compensation resistance R1.This
Sample can make control loop response speed very fast, and when encountering input voltage and increasing suddenly, loop can be adjusted quickly,
It prevents the unexpected increase due to input from causing extra energy transmission to output end, causes output voltage or electric current unstable.?
When input becomes smaller suddenly, loop can then control the output of power stage circuit increase energy, and output voltage or electric current is maintained to stablize.
But the variation of thermal compensation signal influences whether the turn-on time of the power switch of switched mode converter, if control
Loop response speed is very fast, then thermal compensation signal changing greatly in a power frequency period, corresponds to the conducting so that power switch
Time is also more big changes, this, which will lead to input current, can not follow input voltage, and input current waveform distorts than more serious,
Fundametal compoment is smaller.Power inverter has poor power factor (Power Factor, PF) and total harmonic distortion factor
(Total Harmonic Distortion,THD).This is that designer is undesirable.
Summary of the invention
In view of this, the present invention provides a kind of compensation circuit and the control circuit using it, power inverter is being improved
Output is kept to stablize input voltage variation quick response while power factor and total harmonic distortion factor.
In a first aspect, providing a kind of compensation circuit, for the control loop of power inverter, the compensation circuit includes:
Compensation network, for generating thermal compensation signal；
Input feedback circuit, for feeding back input voltage to the compensation network to improve the compensation circuit for defeated
Enter the response speed of voltage.
Preferably, the compensation network be provided so that the power inverter have desired power factor and/or
Percent harmonic distortion.
Preferably, the input feedback circuit is used to input voltage negative-feedback making the compensation to the compensation network
Signal is in the opposite manner with input voltage fluctuation.
Preferably, the compensation network includes the compensating electric capacity and benefit being connected between thermal compensation signal output end and reference end
Repay resistance.
Preferably, the input feedback circuit includes:
Sampling capacitance is set between the sampling end and reference end；
Divider resistance is connected between the sampling end and intermediate ends；
Wherein, the voltage of the sampling end changes with the input voltage reverse sync, and the intermediate ends are the compensation
The common end of capacitor and the compensation resistance.
Preferably, the input feedback circuit further include:
Switching element is connected between the synchronous end of input voltage and the sampling end, with the power of the power inverter
Switch synchronous on and off；
The voltage at the synchronous end of the input voltage is synchronous with the input voltage during power switch conducting.
Preferably, the power inverter is that source side controls inverse excitation type converter, and the voltage synchronous end is auxiliary winding
Same Name of Ends.
Preferably, the switching element is diode, and cathode end synchronous with the input voltage connects, and anode is adopted with described
The connection of sample end；Alternatively,
The switching element is controlled switching element, according to switch control signal with the power switch of the power inverter
Synchronous turn-on and turn-off.
Second aspect provides a kind of control circuit, for controlling the power stage circuit of power inverter, the control circuit
Including compensation circuit as described above.
By feeding back input voltage to the compensation network to improve response of the compensation circuit for input voltage
Speed, thus, it is possible on the larger thermal compensation signal for postponing and input current being made preferably to follow input voltage
It is superimposed the variation of input voltage, thus for input while improving the power factor and total harmonic distortion factor of power inverter
Voltage change quick response keeps output to stablize.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, the above and other purposes of the present invention, feature and
Advantage will be apparent from, in the accompanying drawings:
Fig. 1 is the schematic diagram of existing compensation circuit；
Fig. 2 is the schematic diagram of existing primary-side-control inverse excitation type converter；
Fig. 3 is the schematic diagram of the compensation circuit of the embodiment of the present invention；
Fig. 4 is the schematic diagram of the primary-side-control inverse excitation type converter of the embodiment of the present invention；
Fig. 5 a is the working waveform figure for being not provided with the power inverter of input feedback circuit；
Fig. 5 b is the working waveform figure of the power inverter of the embodiment of the present invention.
Specific embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
Text is detailed to describe some specific detail sections in datail description of the invention.Do not have for a person skilled in the art
The present invention can also be understood completely in the description of these detail sections.In order to avoid obscuring essence of the invention, well known method, mistake
There is no narrations in detail for journey, process, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refers to be passed through electrically by least one element or sub-circuit
The galvanic circle that connection or electromagnetism connect and compose.When title element or the " connection of another element of circuit " being connected to " or element/circuit
" between two nodes when, it, which can be, is directly coupled or connected another element or there may be intermediary element, element it
Between connection can be physically, in logic or its combination.On the contrary, when claiming element " being directly coupled to " or " directly connecting
Be connected to " another element when, it is meant that the two be not present intermediary element.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, be " including but not limited to " contains
Justice.
In the description of the present invention, it is to be understood that, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " multiple "
It is two or more.
Fig. 3 is the schematic diagram of the compensation circuit of the embodiment of the present invention.As shown in figure 3, the compensation circuit includes amplification electricity
Road AP, compensation network CP and input feedback circuit FB.Amplifying circuit AP is used for fault in enlargement signal Verr.Amplifying circuit AP can
Think trsanscondutance amplifier, it can also be with operational amplifier.Compensation network CP is arranged in a manner of compatible with amplifying circuit AP.It is putting
When big circuit AP is trsanscondutance amplifier, compensation network CP may include being connected to mutual conductance amplifier out and reference end (ground connection
End) between compensating electric capacity C1 and compensation resistance R1.Wherein, compensating electric capacity C1 is connect with trsanscondutance amplifier output end, compensation electricity
Resistance R1 is connect with reference end.When amplifying circuit is operational amplifier, compensation network CP can be that be connected across operational amplifier defeated
Enter the resistance-capacitance network between end and output end and error signal input.Compensation network CP can be in the prior art
Any type of compensation network, for generating thermal compensation signal Vcomp according to amplified error signal.Thermal compensation signal Vcomp is used
Deviate desired value in the average value for embodying the circuit parameter (output voltage or output electric current or other parameters) in a period of time
Degree is expected so that the work that control loop generates control Signal Regulation power stage circuit keeps output to meet.Input feedback electricity
Road FB is used to improving input voltage vin or the Voltage Feedback proportional to input voltage vin into compensation electricity to compensation network CP
Response speed of the road for input voltage.That is, input feedback circuit FB input p*Vin exports q*Vin to compensation network CP.It is defeated
Enter feed circuit FB from order to which the feed circuit for obtaining current circuit state is different, feedback parameters are directly applied to compensation net
Network CP, to be superimposed the component of the variation of an embodiment input voltage on thermal compensation signal Vcomp.Control loop can be with as a result,
There is faster response speed for the variation of input voltage.Preferably, when needing that output is kept to stablize, input voltage is born
Feeding back the compensation network fluctuates the thermal compensation signal in the opposite manner with input voltage, but realization pair as a result,
In the quick adjustment of input fluctuation.
As a result, by feeding back input voltage to the compensation network to improve the compensation circuit for input voltage
Response speed, thus, it is possible to believe with the larger compensation for postponing and input current being made preferably to follow input voltage
The variation of number upper superposition input voltage, thus while improving the power factor and total harmonic distortion factor of power inverter for
Input voltage changes quick response and output is kept to stablize.
It should be understood that the compensation circuit of the embodiment of the present invention can be applied to the control of various different types of power inverters
Loop.The compensation circuit of the embodiment of the present invention is described further for being applied to primary side inverse excitation type converter below.Fig. 4
It is the schematic diagram of the primary-side-control inverse excitation type converter of the embodiment of the present invention.As shown in figure 4, primary-side-control inverse excitation type converter packet
Include transformer, power switch Q, secondary side current rectifying and wave filtering circuit 41 and control circuit.Wherein, transformer include primary side winding L1 and
Vice-side winding L2.Control circuit include Integrated circuit IC, compensation network CP, auxiliary winding L3, input voltage feed circuit FB with
And other circuits.Power switch Q is connected between primary side winding L1 and ground terminal, flows through primary side winding L1's by controlling electric current
Time, control are output to the power on secondary side.The necessary parts of control loop, such as error amplification electricity are integrated in Integrated circuit IC
Road, zero cross detection circuit etc..The amplifying circuit of compensation circuit is also integrated in Integrated circuit IC, external pin is COMP
(the present embodiment is illustrated so that amplifying circuit is using trsanscondutance amplifier as an example).In Integrated circuit IC, pin ZCS is zero passage inspection
Survey pin, ISEN is primary current detection pin, GND is reference end pin, VIN is energization pins, DRV is control signal output
Pin.Compensation network CP is connect with pin COMP, to generate thermal compensation signal at pin COMP.Integrated circuit IC can be according to drawing
Thermal compensation signal at foot COMP generates the control terminal that control signal is output to power switch Q via internal circuit.Auxiliary winding L3
Effect be to be coupled with primary side winding and vice-side winding, to acquire the voltage for obtaining vice-side winding both ends, which can be with
It is used for zero passage detection, powers after can be also used for circuit start for Integrated circuit IC.In embodiments of the present invention, due to auxiliary
The voltage of winding L3 can characterize input voltage, therefore, can be used as the synchronous end of input voltage and use.In the present embodiment
In, compensation network CP includes compensating electric capacity C1 and compensation resistance R1.In value, by by compensating electric capacity C1 be set as have compared with
Big capacitance, while keeping compensation resistance R1 that there is lesser resistance value, the response speed of control loop can be made to slow down,
This can enable input currents preferably to follow input voltage, and input current waveform is larger closer to sine, i.e. fundametal compoment.
Meanwhile it is smaller that thermal compensation signal can be made to change in a power frequency period, so that the turn-on time of power switch Q is in a work
Substantially constant in the frequency period, to obtain higher power factor and preferable total harmonic distortion factor.But it if is not provided with defeated
Enter feed circuit, then since loop response is slow, output is easy to be mutated with input, causes to export unstable.
In Fig. 4, input feedback circuit FB includes switching element D1, divider resistance R2 and sampling capacitance C2.Wherein, switch
Element D1 is diode, is connected between the synchronous end i and sampling end s of input voltage, opens with the power of the power inverter
Close synchronous on and off.Divider resistance R2 is connected between sampling end s and intermediate ends m.Intermediate ends m is to mend in compensation network CP
It repays capacitor C1 and compensates the common end of resistance R1.Sampling capacitance C2 is set between sampling end s and reference end.Wherein, input electricity
Press predetermined amount of time of the synchronous end i in switch periods that can be applied the synchronization changed with the input voltage reverse sync
Voltage, the synchronizing voltage can obtain by various modes.In Fig. 4, using the earth-free one end auxiliary winding L3 as defeated
Enter voltage synchronous end.In power switch Q conducting, the voltage being applied on primary side winding L1 is approximately equal to input voltage.At this point, secondary
The both end voltage of side winding L2 is proportional to the voltage on primary side winding L1, and Same Name of Ends voltage is lower than the voltage of ground terminal, from
And Same Name of Ends voltage is negative.The voltage of auxiliary winding L3 Same Name of Ends is proportional to the voltage of vice-side winding L2, the electricity of Same Name of Ends
Pressure is also negative, and its amplitude is proportional to input voltage vin.That is, Vi=-kVin, k are positive.Auxiliary winding L3 is of the same name as a result,
End voltage changes with the input voltage reverse sync.Due to diode D1 cathode and auxiliary winding L3 Same Name of Ends, anode with
Sampling end s connection.Therefore, during power switch Q conducting, diode D1 is also switched on.During power switch Q shutdown, secondary side
Winding L2 exports electric current to output end using original energy storage, at this point, the voltage of its Same Name of Ends is positive.It is kept with vice-side winding L2
The Same Name of Ends voltage of consistent auxiliary winding L3 is similarly positive.Therefore, during power switch Q shutdown, diode D1 is also closed
It is disconnected.Diode D1 can with power switch Q basic synchronization on or off as a result,.This makes sampling end act on one always
The voltage of the input voltage reverse sync variation.Sampling capacitance C2 is used to keep voltage Vs, meanwhile, divider resistance
R2 is used to form a potential-divider network with compensation resistance R1, divides to Vs, by the amplitude negative electricity proportional to input voltage
Pressure acts on compensating electric capacity C1, so that thermal compensation signal Vcomp changes with input voltage basic synchronization.
Fig. 5 a is the working waveform figure for being not provided with the power inverter of input feedback circuit.Fig. 5 b is the embodiment of the present invention
The working waveform figure of power inverter.In fig 5 a, in the range of two power frequency periods, thermal compensation signal Vcomp is kept substantially
It is constant, meanwhile, intermediate ends voltage Vm is also kept constant, and as a result, when input voltage vin increases suddenly, circuit cannot be to this work
It responds out, output electric current can be increased accordingly, unstable so as to cause output electric current Iout.And in figure 5b, it is defeated being provided with
After entering feed circuit, intermediate ends voltage Vm with the fluctuation of input voltage and reverse phase fluctuate, due to compensating electric capacity C1 capacitance compared with
Greatly, both end voltage kept stable, therefore, thermal compensation signal Vcomp are equal to Vm and add Vc1, are equivalent on Vm and are superimposed one
Constant voltage, therefore, thermal compensation signal Vcomp are also reversely fluctuated with the fluctuation of input voltage.When input voltage increases suddenly,
Thermal compensation signal Vcomp is correspondingly reduced, and control loop adjusts the turn-on time of power switch Q accordingly, so that output electric current
Iout keeps stablizing.Simultaneously as compensating electric capacity C1 is arranged larger, circuit still can be by power factor and total harmonic distortion factor
It is maintained at desired value.
Optionally, the switching element in input feedback circuit FB could alternatively be controlled switching element, such as metal oxidation
Object field effect transistor (MOSFET) is controlled by the control signal of control power switch, thus synchronous turn-on and turn-off.
Moreover, the mode shown in Fig. 4 for carrying out input voltage negative-feedback is also only example, those skilled in the art can be selected
Other way is taken to obtain the parameter that changes with input voltage reverse sync to exert one's influence to thermal compensation signal.
When a parameter in entire switch periods with the variation of input voltage reverse sync can be obtained, then switch
Element can be omitted.
Meanwhile the compensation circuit of the embodiment of the present invention is not limited to using in the power inverter with other topological structures
On, for example, it can be applied on voltage-dropping type (BUCK) converter with auxiliary winding.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For, the invention can have various changes and changes.All any modifications made within the spirit and principles of the present invention are equal
Replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of compensation circuit, for the control loop of power inverter, the compensation circuit includes:
Compensation network, for generating thermal compensation signal；
Input feedback circuit makes the thermal compensation signal in the opposite manner for feeding back input voltage to the compensation network
With input voltage fluctuation, to improve the compensation circuit for the response speed of input voltage.
2. compensation circuit according to claim 1, which is characterized in that the compensation network is provided so that the power
Converter has desired power factor and/or percent harmonic distortion.
3. compensation circuit according to claim 1 or 2, which is characterized in that the compensation network includes being connected on compensation letter
Compensating electric capacity and compensation resistance number between output end and reference end.
4. compensation circuit according to claim 3, which is characterized in that the input feedback circuit includes:
Sampling capacitance is set between sampling end and reference end；
Divider resistance is connected between the sampling end and intermediate ends；
Wherein, the voltage of the sampling end changes with the input voltage reverse sync, and the intermediate ends are the compensating electric capacity
With the common end of the compensation resistance.
5. compensation circuit according to claim 4, which is characterized in that the input feedback circuit further include:
Switching element is connected between the synchronous end of input voltage and the sampling end, with the power switch of the power inverter
Synchronous on and off；
The voltage at the synchronous end of the input voltage is synchronous with the input voltage during power switch conducting.
6. compensation circuit according to claim 5, which is characterized in that the power inverter is that source side controls inverse-excitation type change
Parallel operation, the voltage synchronous end are the Same Name of Ends of auxiliary winding.
7. compensation circuit according to claim 5 or 6, which is characterized in that the switching element is diode, cathode and institute
The synchronous end connection of input voltage is stated, anode is connect with the sampling end；Alternatively,
The switching element is controlled switching element, synchronous with the power switch of the power inverter according to switch control signal
Turn-on and turn-off.
8. a kind of control circuit, for controlling the power stage circuit of power inverter, the control circuit includes such as claim
Compensation circuit described in any one of 1-7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611040473.XA CN106787621B (en) | 2016-11-11 | 2016-11-11 | Compensation circuit and the control circuit for applying it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611040473.XA CN106787621B (en) | 2016-11-11 | 2016-11-11 | Compensation circuit and the control circuit for applying it |
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| CN106787621A CN106787621A (en) | 2017-05-31 |
| CN106787621B true CN106787621B (en) | 2019-07-30 |
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| CN107707101A (en) * | 2017-09-25 | 2018-02-16 | 北京机械设备研究所 | A kind of control system of anti-input voltage and anti-loading fluctuation based on boost converters |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255526A (en) * | 2011-06-23 | 2011-11-23 | 深圳市富满电子有限公司南山分公司 | AC-DC power supply conversion chip and power switching circuit |
| CN102290970A (en) * | 2011-08-08 | 2011-12-21 | 无锡中星微电子有限公司 | Mode selecting and controlling circuit in voltage converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9190899B2 (en) * | 2011-09-28 | 2015-11-17 | General Electric Company | Power factor correction (PFC) circuit configured to control high pulse load current and inrush current |
| CN102611296B (en) * | 2012-03-13 | 2014-09-03 | 华为技术有限公司 | Switch switching-off triggering circuit and power factor correction circuit |
| CN103151924B (en) * | 2013-01-31 | 2015-02-18 | 成都启臣微电子有限公司 | High-precision constant-current and constant-power self-adaption compensating circuit |
| CN204539535U (en) * | 2014-12-27 | 2015-08-05 | 欧普照明股份有限公司 | A kind of LED Drive and Control Circuit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255526A (en) * | 2011-06-23 | 2011-11-23 | 深圳市富满电子有限公司南山分公司 | AC-DC power supply conversion chip and power switching circuit |
| CN102290970A (en) * | 2011-08-08 | 2011-12-21 | 无锡中星微电子有限公司 | Mode selecting and controlling circuit in voltage converter |
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