CN107516995A - Suitable for the ripple compensation circuit of power supply unit and its compensation method - Google Patents
Suitable for the ripple compensation circuit of power supply unit and its compensation method Download PDFInfo
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- CN107516995A CN107516995A CN201610423922.2A CN201610423922A CN107516995A CN 107516995 A CN107516995 A CN 107516995A CN 201610423922 A CN201610423922 A CN 201610423922A CN 107516995 A CN107516995 A CN 107516995A
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M1/0012—Control circuits using digital or numerical techniques
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
This application discloses a kind of suitable for the ripple compensation circuit of power supply unit and its compensation method, the compensation method is applied to the ripple compensation circuit of power supply unit, power supply unit includes LLC harmonic conversion circuits, LLC harmonic conversion circuits are to receive input voltage and export output voltage, and compensation method includes step：(a) by reference voltage and output voltage subtraction, to produce the first error signal；(b) low-frequency gain of the first error signal is lifted using digital filter, to produce the second error signal；(c) the first error signal and the second error signal are made into add operation, to produce modulation error signal；(d) thermal compensation signal is correspondingly produced to control LLC harmonic conversion circuits according to modulation error signal, with the response for improving the low-frequency gain of LLC input voltages and improving voltage loop compensation circuit, the corresponding output of LLC harmonic conversions circuit is set to suppress the output voltage of low-frequency ripple.
Description
Technical field
The application is related to a kind of ripple compensation circuit, more particularly to a kind of ripple compensation circuit suitable for power supply unit
And compensation method.
Background technology
Power supply unit is a kind of very commonly used electronic product in daily life, almost all of electrical installation
All possess power supply unit, used with supplying intraware or electronic component of the power supply to electrical installation.With ac/dc power supply
Exemplified by supply, it generally comprises a PFC (PFC) circuit and a LLC harmonic conversion circuits.Wherein, power factor
Correcting circuit is to receive alternating voltage, such as civil power, and carries out PFC to alternating voltage, to export transition direct current
Pressure.LLC harmonic conversions circuit then receives transition DC voltage, and is converted to the transition DC voltage received with resonance manner
The output DC voltage of different voltage class.
However, when using ac/dc power supply unit, by a low frequency be present (typically in the alternating voltage received
Refer to frequency 90Hz to 120Hz ripple), therefore the transition DC voltage and LLC for causing circuit of power factor correction to be exported
The output DC voltage that harmonic conversion circuit is exported, which also corresponds to, has low-frequency ripple, and it is unnecessary that those low-frequency ripples not only produce
Electric energy loss, more likely make the running of ac/dc power supply unit abnormal, also produce noise and noise.
In the prior art, for having the suppression low-frequency ripple of the ac/dc power supply unit of LLC harmonic conversion circuits
Method predominantly takes analog filtering mode, that is, adds an analogue filter circuit, example in the output end of LLC harmonic conversion circuits
Such as RC filter circuits or LC filter circuits, to filter out the low frequency line in the output DC voltage that LLC harmonic conversion circuits are exported
Ripple.Although using analogue filter circuit and in design when by calculate the resistance of related elements in ac/dc power supply unit,
Capacitance, sensibility reciprocal, it can effectively suppress low-frequency ripple to a certain extent.So the mode of this increase analogue filter circuit both increased
Add the production cost of ac/dc power supply unit, also increase wanting for the application space in ac/dc power supply unit
Ask.
In order to solve the problem that above-mentioned increase analogue filter circuit, then it is changed in many other prior documents
By the method for the low-frequency gain for improving the voltage received by the input of LLC harmonic conversion circuits, to suppress ac/dc
The low-frequency ripple of output voltage in power supply unit, such a method are the output voltages for being exported LLC harmonic conversion circuits
Multiplying is directly made in gain with wave filter, with the low-frequency gain of the output voltage by lifting LLC harmonic conversion circuits and
Produce a gain signal, and the input voltage directly received by gain signal compensation LLC harmonic conversion circuits, Jin Erti
The low-frequency gain of high input voltage.Refer to Figure 1A and Figure 1B, wherein Figure 1A is in the prior art after gain signal compensates
LLC harmonic conversion circuits the gain versus frequency oscillogram of voltage that is received of input, Figure 1B be for corresponding diagram 1A be through
The Phase-Frequency oscillogram for the voltage that the input of LLC harmonic conversion circuits after gain signal compensation is received.However, by
It is to utilize the defeated of LLC harmonic conversion circuits in the method for the low-frequency gain of the input voltage of above-mentioned raising LLC harmonic conversion circuits
The gain for going out voltage and wave filter is made multiplying and produced, and its zero point and limit produce change in fact, thus according to zero point and
The gain signal that limit changes carrys out the input voltage of direct compensation LLC harmonic conversion circuits, real to produce obvious phase punching
Hit, for example, Figure 1A indicates A region, the input voltage for representing the LLC harmonic conversion circuits after improving gain and compensating exists
The gain improved during frequency about 100Hz, but A ' region is indicated from Figure 1B, when such as Figure 1A improves voltage gain
While, the phase that about 90deg to about -90deg really be present is impacted, and this huge phase impact will cause ac/dc electric
Source supply it is unstable.
Therefore, how to develop it is a kind of overcome disadvantages mentioned above suitable for power supply unit ripple compensation circuit and its be applicable
Compensation method, actually urgent demand at present.
The content of the invention
The purpose of the application is to provide a kind of ripple compensation circuit suitable for power supply unit and its applicable compensation
Method, wherein ripple compensation circuit can not only lift the low-frequency gain of the voltage of the input of LLC harmonic conversion circuits, and then press down
Low-frequency ripple processed, phase impact can be more reduced, to maintain the stability of power supply unit.What is more, the ripple compensation of the application
Circuit can reduce the use space of the inside of power supply unit, and lower production cost.
For the above-mentioned purpose, a better embodiment of the invention is mended to provide a kind of ripple suitable for power supply unit
Circuit is repaid, wherein power supply unit includes LLC harmonic conversion circuits, and the input of LLC harmonic conversion circuits is to receive input electricity
Pressure, the output end of LLC harmonic conversion circuits is output output voltage.Ripple compensation circuit be comprising subtracter, digital filter,
Adder and voltage loop compensation circuit.The input of subtracter is connected with the output end of LLC harmonic conversion circuits, subtraction
Device is Rreceive output voltage and reference voltage, and by reference voltage and output voltage subtraction, to produce the first error
Signal.The input of digital filter is connected with the output end of subtracter, to receive the first error signal, and lifts the
The low-frequency gain of one error signal, and then produce the second error signal.The input of adder be with the output end of subtracter with
And the output end of digital filter is connected, adder is to receive the first error signal and the second error signal, and first is missed
Difference signal and the second error signal make add operation, to produce modulation error signal.The input of voltage loop compensation circuit is
It is connected with the output end of adder, the output end of voltage loop compensation circuit is connected with LLC harmonic conversion circuits, voltage
Loop compensation circuit is to receive modulation error signal, and correspondingly produces thermal compensation signal according to modulation error signal to control LLC humorous
Shake change-over circuit, with the response for improving the low-frequency gain of input voltage and improving voltage loop compensation circuit, turns LLC resonance
Change the output voltage that the corresponding output of circuit suppressed low-frequency ripple.
Another embodiment of the present invention is provides a kind of compensation method, suitable for the ripple compensation electricity of power supply unit
Road, wherein power supply unit include LLC harmonic conversion circuits, and the input of LLC harmonic conversion circuits is to receive input voltage,
The output end of LLC harmonic conversion circuits is output output voltage.The compensation method of the application includes step：(a) by one with reference to electricity
Pressure and output voltage subtraction, to produce the first error signal；(b) the first error signal is lifted using digital filter
Low-frequency gain, and then produce the second error signal；(c) the first error signal and the second error signal are made into add operation, with
Produce modulation error signal；(d) thermal compensation signal is correspondingly produced to control LLC harmonic conversion circuits according to modulation error signal, with
The low-frequency gain of LLC input voltages is improved, and makes LLC harmonic conversions circuit is corresponding to export the output electricity for suppressing low-frequency ripple
Pressure.
For another embodiment of the present invention to provide a kind of power supply unit, wherein power supply unit is to include LLC resonance
Change-over circuit and ripple compensation circuit.The input of LLC harmonic conversion circuits is to receive input voltage, LLC harmonic conversions electricity
The output end on road is output output voltage.Ripple compensation circuit is to include subtracter, digital filter, adder and voltage loop
Compensation circuit.The input of subtracter is connected with the output end of LLC harmonic conversion circuits, and subtracter is Rreceive output voltage
And reference voltage, and by reference voltage and output voltage subtraction, to produce the first error signal.Digital filter
Input is connected with the output end of subtracter, to receive the first error signal, and lifts the low frequency of the first error signal
Gain, and then produce the second error signal.The input of adder is defeated with the output end of subtracter and digital filter
Going out end to be connected, adder is to receive the first error signal and the second error signal, and by the first error signal and the second error
Signal makees add operation, to produce modulation error signal.The input of voltage loop compensation circuit is the output end with adder
It is connected, the output end of voltage loop compensation circuit is connected with LLC harmonic conversion circuits, and voltage loop compensation circuit is to connect
Modulation error signal is received, and thermal compensation signal is correspondingly produced to control LLC harmonic conversion circuits according to modulation error signal, to improve
The low-frequency gain of input voltage and the response for improving voltage loop compensation circuit, make the corresponding output suppression of LLC harmonic conversions circuit
Made the output voltage of low-frequency ripple.
Brief description of the drawings
Figure 1A is the electricity received for the input of the LLC harmonic conversion circuits after gain signal compensates in the prior art
The gain versus frequency oscillogram of pressure.
It is that the inputs of the LLC harmonic conversion circuits after gain signal compensates receives by corresponding diagram 1A that Figure 1B, which is,
The Phase-Frequency oscillogram of voltage.
Fig. 2 is the circuit diagram of the ripple compensation circuit suitable for power supply unit for the application preferred embodiment.
Fig. 3 is the Organization Chart of the z fields transfer function for the digital filter shown in Fig. 2.
Fig. 4 is the flow chart for the compensation method of the ripple compensation circuit shown in Fig. 2.
Fig. 5 A are voltage-timing simulation result figures for the first error signal shown in the application Fig. 2.
Fig. 5 B are voltage-timing simulation result figures for the second error signal shown in the application Fig. 2.
Fig. 5 C are voltage-timing simulation result figures for the modulation error signal shown in the application Fig. 2.
Fig. 6 A are for the output voltage that the LLC harmonic conversion circuits of the ripple compensation circuit of the application are exported is not used
The voltage of low-frequency ripple-timing simulation result figure.
Fig. 6 B are the low frequencies of the output voltage to be exported using the LLC harmonic conversion circuits of the application ripple compensation circuit
The voltage of ripple-timing simulation result figure.
Fig. 7 A are for the output voltage that the LLC harmonic conversion circuits of the ripple compensation circuit of the application are exported is not used
The amplitude-frequency of low-frequency ripple intends result figure.
Fig. 7 B are the low frequencies of the output voltage to be exported using the LLC harmonic conversion circuits of the application ripple compensation circuit
The amplitude-frequency analog result figure of ripple.
Fig. 8 A are for the increasing of the input voltage of the LLC harmonic conversion circuits after the ripple compensation circuit compensation of the application
Benefit-frequency oscillogram.
It for corresponding diagram 8A is the defeated of LLC harmonic conversion circuits after the ripple compensation circuit compensation of the application that Fig. 8 B, which are,
Enter the Phase-Frequency oscillogram of voltage.
Description of reference numerals：
A、A’、B、B’、C、C’：Indicate region
1：Power supply unit
2：Ripple compensation circuit
3：LLC harmonic conversion circuits
21：Subtracter
22：Digital filter
23、31：Adder
24：Voltage loop compensation circuit
Ve：First error signal
Ve’：Second error signal
Vin：Input voltage
Vout：Output voltage
Vref：Reference voltage
Vg：Modulation error signal
Sc：Thermal compensation signal
a1、a2、b1、b2：Filter coefficient
z-1：First-order lag unit
Embodiment
Embodying some exemplary embodiments of the application features and advantages will describe in detail in the explanation of back segment.It should be understood that
It is that the application can have various changes in different aspects, it does not all depart from scope of the present application, and explanation therein
And accompanying drawing be treated as in itself be described use, not for limitation the application.
Fig. 2 is the circuit diagram of the ripple compensation circuit suitable for power supply unit for the application preferred embodiment.
As shown in Fig. 2 the ripple compensation circuit 2 of the application is applied in a power supply unit 1, wherein the power supply unit 1 can be
But an ac/dc power supply unit is not limited to, and the power supply unit 1 is to include a LLC harmonic conversions circuit 3, the LLC is humorous
The change-over circuit 3 that shakes is that the input voltage vin that will be received is converted to an output voltage Vout with resonance manner, to be supplied to and electricity
The load that source supply 1 electrically connects, such as electrical installation use.
Ripple compensation circuit 2 is to include a subtracter 21, a digital filter 22, an adder 23 and a voltage loop
Compensation circuit 24.The input of subtracter 21 is connected with the output end of LLC harmonic conversions circuit 3, and subtracter 21 is to receive
The output voltage Vout and a reference voltage Vref of LLC harmonic conversions circuit 3, and by reference voltage Vref and output voltage
Vout subtractions, to produce the first error signal Ve according to the difference between reference voltage Vref and output voltage Vout.
The input of digital filter 22 is connected with the output end of subtracter 21, and is preset with z fields transfer letter
Number, digital filter 22 lift the first error signal Ve to receive the first error signal Ve using z fields transfer function
Low-frequency gain, and then produce one second error signal Ve '.In some embodiments, above-mentioned low-frequency gain is between frequency
Voltage gain between 90Hz-120Hz.
Referring to Fig. 3, and coordinate Fig. 2, wherein Fig. 3 to be for the digital filter shown in Fig. 2 z fields transfer function frame
Composition.As illustrated, the digital filter 22 of the application can be but be not limited to by an infinite impulse response filter (infinite
Impulse response filter, IIR filter) formed, the infinite impulse response filter is to be preset with z fields to turn
Move function, i.e. following formula (1)：
In formula (1), H (z) refers to z fields transfer function, and Ve refers to the first error signal, and Ve ' refers to that the second error is believed
Number, a1, a2, b1, b2 are the filter coefficients for infinite impulse response filter, z-1For first-order lag unit, z-2For two one
Rank delay cell z-1Make the scond-order lag unit obtained by multiplying.And in order to realize formula (1), usually with shown in Fig. 3
Organization Chart realizes that wherein label 31 is an adder, and infinite impulse response filter is by the first error signal Ve and second
Error signal Ve ' is by filter coefficient a1, a2 in Fig. 3, b1, b2, first-order lag unit z-1And adder 31 does computing,
And then obtain the z field transfer function H (z) of the application.What is more, the limit of wave filter can be adjusted by adjusting a1, a2 coefficient
The position of setting, adjustment b1, b2 coefficient can adjust the position of the reset of wave filter, by adjusting above-mentioned wave filter system
Several numerical value, the wave filter that different frequency possesses different gains effect can be designed at, such as the application turns by adjusting z fields
Move function H (z) filter coefficient, you can digital filter 22 is reached voltage of the lifting between frequency 90Hz-120Hz and increase
Benefit, so because the voltage gain that lifting 90Hz-120Hz can be all designed by adjusting different above-mentioned multiple filter coefficients is imitated
The wave filter of fruit, the filter coefficient gimmick that actually those skilled in the art commonly use is adjusted again, therefore repeat no more adjustment wave filter
The mode of coefficient.
Referring again to Fig. 2, the input of adder 23 is defeated with the output end of subtracter 21 and digital filter 22
Go out end to be connected, adder 23 is to receive the first error signal Ve that subtracter 21 is exported to be exported with digital filter 22
Second error signal Ve ', and the first error signal Ve and the second error signal Ve ' are made into add operation, missed with producing a modulation
Difference signal Vg.
The input of voltage loop compensation circuit 24 is connected with the output end of adder 23, voltage loop compensation circuit
24 output end is connected with LLC harmonic conversions circuit 3, and voltage loop compensation circuit 24 receives adder 23 and exported
Modulation error signal Vg, and corresponded to according to modulation error signal Vg and produce a thermal compensation signal Sc to control LLC harmonic conversion circuits
3, to improve the low-frequency gain for the input voltage vin that LLC harmonic conversions circuit 3 is received and improve voltage loop compensation circuit
Response, LLC harmonic conversions circuit 3 is corresponded to export and had been suppressed because the low-frequency gain of input voltage vin has been lifted whereby
The output voltage Vout of low-frequency ripple.
Please refer to Fig. 2 and Fig. 4, wherein Fig. 4 is the flow for the compensation method of the ripple compensation circuit shown in Fig. 2
Figure.As shown in figure 4, the compensation method of the ripple compensation circuit 2 of the application comprises the steps of.First, step S1 is performed, is received
The output voltage Vout and reference voltage Vref of LLC harmonic conversions circuit 3, and by reference voltage Vref and output voltage Vout
Subtraction, to produce the first error signal Ve.Then, step S2 is performed, digital filter 22 receives the first error signal
Ve, and first error signal Ve low-frequency gain is lifted using the z fields transfer function for defaulting in digital filter 22, and then
Produce the second error signal Ve '.Then, step S3 is performed, adder 23 receives the first error signal Ve and the second error signal
Ve ', and the first error signal Ve and the second error signal Ve ' are made into add operation, to produce modulation error signal Vg.Finally hold
Row step S4, voltage loop compensation circuit 24 receives modulation error signal Vg, and is mended according to corresponding produce of modulation error signal Vg
Signal Sc is repaid to control LLC harmonic conversions circuit 3, to improve the low-frequency gain of the input voltage vin of LLC harmonic conversions circuit 3,
The corresponding output of LLC harmonic conversions circuit 3 is set to suppress the output voltage Vout of low-frequency ripple.
Please refer to Fig. 2 and Fig. 5 A-5C, wherein Fig. 5 A be for the first error signal shown in the application Fig. 2 voltage-
Timing simulation result figure, Fig. 5 B are voltage-timing simulation result figures for the second error signal shown in the application Fig. 2, Fig. 5 C
It is voltage-timing simulation result figure for the modulation error signal shown in the application Fig. 2.By that can be learnt in Fig. 5 A-5C, due to number
Word wave filter 22 improves the first error signal Ve low-frequency gain (can be obtained compared with Fig. 5 B by Fig. 5 A), therefore passes through the first error
Caused modulation error signal Vg can suppress error signal Ve institutes companion after signal Ve and the second error signal Ve ' makees add operation
With low-frequency ripple.
Fig. 6 A and Fig. 6 B are referred to, wherein Fig. 6 A are for the LLC harmonic conversions of the ripple compensation circuit of the application are not used
The voltage of the low-frequency ripple for the output voltage that circuit is exported-timing simulation result figure, Fig. 6 B are to be mended using the application ripple
Repay voltage-timing simulation result figure of the low-frequency ripple for the output voltage that the LLC harmonic conversion circuits of circuit are exported.By Fig. 6 A
And can understand in 6B and learn, when unused the application ripple compensation circuit 2, output that LLC harmonic conversion circuits are exported
The peak to peak magnitude of voltage of the low-frequency ripple of voltage is 469mV, and if using the application ripple compensation circuit 2, LLC harmonic conversions
The peak to peak magnitude of voltage of the low-frequency ripple of circuit 3 can be reduced to 259mV, it is possible thereby to substantially learn, the ripple compensation of the application
Circuit 2 has the technique effect for suppressing ripple really.
Fig. 7 A and Fig. 7 B are referred to, wherein Fig. 7 A are for the LLC harmonic conversions of the ripple compensation circuit of the application are not used
The amplitude-frequency of the low-frequency ripple for the output voltage that circuit is exported intends result figure, and Fig. 7 B are to use the application ripple compensation
The amplitude-frequency analog result figure of the low-frequency ripple for the output voltage that the LLC harmonic conversion circuits of circuit are exported.By Fig. 7 A and
It can understand in 7B and learn, when unused the application ripple compensation circuit 2, the output that LLC harmonic conversion circuits are exported is electric
The amplitude that the low-frequency ripple of pressure is located at 110Hz is about -19dB (region as indicated B), and if using the application ripple compensation electricity
Road 2, then the low-frequency ripple for the output voltage that LLC harmonic conversions circuit 3 is exported be located at 110Hz amplitude and be reduced to -40.6dB
(region as indicated B '), it is possible thereby to substantially learn, the ripple compensation circuit 2 of the application has the technology for suppressing ripple really
Effect.
Fig. 8 A and Fig. 8 B are referred to, wherein Fig. 8 A are turned for the LLC resonance after the ripple compensation circuit compensation of the application
Change the gain versus frequency oscillogram of the input voltage of circuit, it for corresponding diagram 8A is the ripple compensation circuit through the application that Fig. 8 B, which are,
The Phase-Frequency oscillogram of the input voltage of LLC harmonic conversion circuits after compensation.As illustrated, compared in the prior art,
By modulation error signal is directly to make to multiply by the gain of the output voltage and wave filter that are exported LLC harmonic conversion circuits
After method computing, and by modulation error signal be used directly to compensate LLC harmonic conversion circuits input voltage, cause produce phase punching
Hit, because the application is to first pass through digital filter 22 to lift the first error signal Ve low-frequency gain, to produce
Two error signal Ve ', recycle the second error signal Ve ' and the first error signal Ve to make add operation and produce modulation error letter
Number Vg, finally just using the input voltage vin of modulation error signal Vg compensation LLC harmonic conversions circuit 3, consequently, it is possible to modulate
Error signal Vg pole and zero impact can reduce, corresponding to turn by the LLC resonance after modulation error signal Vg compensation
The phase impact for changing the input voltage vin of circuit 3 also reduces.That is, as shown in Fig. 8 A, 8B, wherein indicating C area in Fig. 8 A
Domain, it is that the input voltage vin for representing the LLC harmonic conversions circuit 3 after modulated error signal Vg is compensated is improved in frequency about
Gain during 100Hz, and Fig. 8 B indicate C ' region, then represent the LLC harmonic conversions after modulated error signal Vg compensation
It is about 15deg to about -15deg be present while gain of the input voltage vin of circuit 3 when improving in frequency about 100Hz
Phase impact, it is therefore provable, the phase for causing about 90deg to about -90deg is impacted simultaneously compared to tradition increase gain,
The ripple compensation circuit 2 of the application can reduce phase impact, therefore the ripple of the application is mended while low-frequency gain is lifted really
Repaying circuit 2 while low-frequency ripple is suppressed, can also maintain the stability of power supply unit 1.
In some embodiments, ripple compensation circuit 2 can be integrated in a microcontroller (not shown) for power supply unit 1,
Wherein microcontroller is electrically connected with LLC harmonic conversions circuit 3, mainly to control the running of LLC harmonic conversions circuit 3, and
When the ripple compensation circuit 2 of the application is integrated in microcontroller, can be performed in a digital manner by microcontroller above-mentioned
Compensation method, the low-frequency gain of the input voltage vin of LLC harmonic conversions circuit 3 is compensated whereby, consequently, it is possible to the electricity of the application
Source supply 1 can directly carry out the suppression of low-frequency ripple by microcontroller to LLC harmonic conversions circuit 3, thus without such as
Conventional power source supply need to additionally increase hardware element, for example, RC filter circuits or LC filter circuits etc., therefore the power supply of the application
Supply 1 can reduce the use of inner space, and lower production cost.What is more, due to the storage area and fortune of microcontroller
It is limited to calculate resource, but the digital filter 22 of the application is by the good and digital filtering of low order number using simple, efficiency
Based on device 22, such as infinite impulse response filter, therefore higher frequency selectivity can be reached with relatively low exponent number, therefore institute
Memory cell is few, can't increase the storage area of microcontroller and the burden of calculation resources.
In summary, the application provides a kind of suitable for the ripple compensation circuit of power supply unit and its applicable compensation side
The ripple compensation circuit of method, wherein the application is the low-frequency gain for first passing through digital filter and lifting the first error signal, with
The second error signal is produced, recycles the second error signal to make add operation with the first error signal and produce modulation error letter
Number, then just by the input voltage of the modulation error signal compensation LLC harmonic conversion circuits, therefore the pole of modulation error signal
Point can reduce with zero point impact, the corresponding input voltage caused by the LLC harmonic conversion circuits after modulation error signal compensation
Phase impact also reduce, therefore, the application can while low-frequency ripple is suppressed, also maintenance power supply unit stabilization
Degree.
The application appointed as those skilled in the art apply craftsman think and be it is all as modification, it is so neither de- as attached claim is intended to
Protector.
Claims (15)
1. a kind of ripple compensation circuit for being applied to a power supply unit, the wherein power supply unit include a LLC harmonic conversions
Circuit, an input of the LLC harmonic conversion circuits are to receive an input voltage, an output end of the LLC harmonic conversion circuits
It is one output voltage of output, the ripple compensation circuit is to include：
One subtracter, an input of the subtracter are connected with the output end of the LLC harmonic conversion circuits, the subtracter
It is to receive the output voltage and a reference voltage, and by the reference voltage and the output voltage subtraction, to produce one
First error signal；
One digital filter, an input of the digital filter is connected with an output end of the subtracter, to receive
First error signal, and the low-frequency gain of first error signal is lifted, and then produce one second error signal；
One adder, an input of the adder are the output with the output end of the subtracter and the digital filter
End is connected, and the adder is to receive first error signal and second error signal, and by first error signal with being somebody's turn to do
Second error signal makees add operation, to produce a modulation error signal；And
One voltage loop compensation circuit, an input of the voltage loop compensation circuit are connected with an output end of the adder
Connect, the output end of the voltage loop compensation circuit is connected with the LLC harmonic conversion circuits, and the voltage loop compensation circuit is
The modulation error signal is received, and is corresponded to according to the modulation error signal and produces a thermal compensation signal to control the LLC harmonic conversions
Circuit, with the response for improving the low-frequency gain of the input voltage and improving voltage loop compensation circuit, make the LLC harmonic conversions
The corresponding output of circuit suppressed the output voltage of low-frequency ripple.
2. ripple compensation circuit as claimed in claim 1, the wherein power supply unit also have a microcontroller, the microcontroller
Device is connected with the LLC harmonic conversion circuits, to control the running of the LLC harmonic conversion circuits.
3. ripple compensation circuit as claimed in claim 2, wherein the ripple compensation circuit are integrated in the microcontroller.
4. ripple compensation circuit as claimed in claim 1, the wherein digital filter are an infinite impulse response filter.
5. ripple compensation circuit as claimed in claim 4, the wherein infinite impulse response filter are preset with z fields transfer
Function, the z fields transfer function is the low-frequency gain for lifting first error signal, and the z fields transfer function is：
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<mn>2</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>-</mo>
<mn>2</mn>
</mrow>
</msup>
</mrow>
<mrow>
<mn>1</mn>
<mo>+</mo>
<msub>
<mi>a</mi>
<mn>1</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msup>
<mo>+</mo>
<msub>
<mi>a</mi>
<mn>2</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>-</mo>
<mn>2</mn>
</mrow>
</msup>
</mrow>
</mfrac>
<mo>,</mo>
</mrow>
Wherein, a1, a2, b1 and b2 are the filter coefficients for the infinite impulse response filter, z-1It is for a first-order lag list
Member, z-2It is for a scond-order lag unit.
6. first error signal that ripple compensation circuit as claimed in claim 1, the wherein digital filter are lifted
Low-frequency gain is between frequency 90Hz to the voltage gain between 120Hz.
7. a kind of compensation method, suitable for a ripple compensation circuit of a power supply unit, the wherein power supply unit includes one
LLC harmonic conversion circuits, an input of the LLC harmonic conversion circuits are to receive an input voltage, the LLC harmonic conversion circuits
An output end be one output voltage of output, the compensation method includes step：
(a) by a reference voltage and the output voltage subtraction, to produce one first error signal；
(b) low-frequency gain of first error signal is lifted using a digital filter, and then produces one second error signal；
(c) first error signal and second error signal are made into add operation, to produce a modulation error signal；
(d) it is somebody's turn to do according to the corresponding thermal compensation signal that produces of the modulation error signal with controlling the LLC harmonic conversion circuits with improving
The low-frequency gain of LLC input voltages, the corresponding output of the LLC harmonic conversions circuit is set to suppress the output voltage of low-frequency ripple.
8. compensation method as claimed in claim 7, the wherein digital filter are an infinite impulse response filter.
9. compensation method as claimed in claim 8, the wherein infinite impulse response filter are preset with z fields transfer letter
Number, the z fields transfer function is the low-frequency gain for lifting first error signal, and the z fields transfer function is：
<mrow>
<mfrac>
<mrow>
<msub>
<mi>b</mi>
<mn>1</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msup>
<mo>+</mo>
<msub>
<mi>b</mi>
<mn>2</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>-</mo>
<mn>2</mn>
</mrow>
</msup>
</mrow>
<mrow>
<mn>1</mn>
<mo>+</mo>
<msub>
<mi>a</mi>
<mn>1</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msup>
<mo>+</mo>
<msub>
<mi>a</mi>
<mn>2</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>-</mo>
<mn>2</mn>
</mrow>
</msup>
</mrow>
</mfrac>
<mo>,</mo>
</mrow>
Wherein, a1, a2, b1 and b2 are the filter coefficients for the infinite impulse response filter, z-1It is for a first-order lag list
Member, z-2It is for a scond-order lag unit.
10. the low frequency for first error signal that compensation method as claimed in claim 7, the wherein digital filter are lifted
Gain is between frequency 90Hz to the voltage gain between 120Hz.
11. a kind of power supply unit, comprising：
One LLC harmonic conversion circuits, an input of the LLC harmonic conversion circuits are to receive an input voltage, and the LLC resonance turns
The output end for changing circuit is one output voltage of output；And
One ripple compensation circuit, comprising：
One subtracter, an input of the subtracter are connected with the output end of the LLC harmonic conversion circuits, the subtracter
It is to receive the output voltage and a reference voltage, and by the reference voltage and the output voltage subtraction, to produce one
First error signal；
One digital filter, an input of the digital filter is connected with an output end of the subtracter, to receive
First error signal, and the low-frequency gain of first error signal is lifted, and then produce one second error signal；
One adder, an input of the adder are the output with the output end of the subtracter and the digital filter
End is connected, and the adder is to receive first error signal and second error signal, and by first error signal with being somebody's turn to do
Second error signal makees add operation, to produce a modulation error signal；And
One voltage loop compensation circuit, an input of the voltage loop compensation circuit are connected with an output end of the adder
Connect, the output end of the voltage loop compensation circuit is connected with the LLC harmonic conversion circuits, and the voltage loop compensation circuit is
The modulation error signal is received, and is corresponded to according to the modulation error signal and produces a thermal compensation signal to control the LLC harmonic conversions
Circuit, with the response for improving the low-frequency gain of the input voltage and improving voltage loop compensation circuit, make the LLC harmonic conversions
The corresponding output of circuit suppressed the output voltage of low-frequency ripple.
12. power supply unit as claimed in claim 11, it also includes a microcontroller, and the microcontroller is humorous with the LLC
The change-over circuit that shakes is connected, and to control the running of the LLC harmonic conversion circuits, wherein the ripple compensation circuit is to be integrated in this
In microcontroller.
13. power supply unit as claimed in claim 11, the wherein digital filter are an infinite impulse response filter.
14. power supply unit as claimed in claim 13, the wherein infinite impulse response filter are preset with z fields transfer
Function, the z fields transfer function is the low-frequency gain for lifting first error signal, and the z fields transfer function is：
<mrow>
<mfrac>
<mrow>
<msub>
<mi>b</mi>
<mn>1</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msup>
<mo>+</mo>
<msub>
<mi>b</mi>
<mn>2</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>-</mo>
<mn>2</mn>
</mrow>
</msup>
</mrow>
<mrow>
<mn>1</mn>
<mo>+</mo>
<msub>
<mi>a</mi>
<mn>1</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>-</mo>
<mn>1</mn>
</mrow>
</msup>
<mo>+</mo>
<msub>
<mi>a</mi>
<mn>2</mn>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>z</mi>
<mrow>
<mo>-</mo>
<mn>2</mn>
</mrow>
</msup>
</mrow>
</mfrac>
<mo>,</mo>
</mrow>
Wherein, a1, a2, b1 and b2 are the filter coefficients for the infinite impulse response filter, z-1It is for a first-order lag list
Member, z-2It is for a scond-order lag unit.
15. first error signal that power supply unit as claimed in claim 11, the wherein digital filter are lifted
Low-frequency gain is between frequency 90Hz to the voltage gain between 120Hz.
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| CN201610423922.2A CN107516995A (en) | 2016-06-15 | 2016-06-15 | Suitable for the ripple compensation circuit of power supply unit and its compensation method |
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Cited By (1)
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| CN114583934A (en) * | 2022-05-06 | 2022-06-03 | 浙江富特科技股份有限公司 | Control unit, power conversion device and method for inhibiting output voltage ripple |
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