CN110289768A - A kind of the cross regulation rate control circuit and method of multiple-output electric power - Google Patents
A kind of the cross regulation rate control circuit and method of multiple-output electric power Download PDFInfo
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- CN110289768A CN110289768A CN201910684501.9A CN201910684501A CN110289768A CN 110289768 A CN110289768 A CN 110289768A CN 201910684501 A CN201910684501 A CN 201910684501A CN 110289768 A CN110289768 A CN 110289768A
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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
- 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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
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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
- H02M1/0048—Circuits or arrangements for reducing losses
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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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Abstract
The present invention relates to the cross regulation rate control circuits and method of a kind of multiple-output electric power, belong to cross regulation rate control technology field, solve low efficiency in the prior art, the low problem of main output voltage precision.The circuit includes multiple-output electric power, coupling inductance L1 and feedback control circuit；Multiple-output electric power includes input power Uin, main output Vo1 and auxiliary output Vo2；Coupling inductance L1 is connected between main output Vo1 and auxiliary output Vo2, for regulating and controlling the output voltage of main output Vo1 according to the output voltage of auxiliary output Vo2；Feedback control circuit includes PI controller and PWM generator, PI controller is used to receive the output voltage of main output Vo1 as feedback signal, regulate and control the pwm signal that PWM generator output has corresponding duty ratio, and then controls power supply of the input power Uin to multiple-output electric power.The circuit realizes the indirect closed-loop control of auxiliary output Vo2, improves the output voltage control effect of auxiliary output.
Description
Technical field
The present invention relates to cross regulation rate control technology field more particularly to a kind of cross regulation rates of multiple-output electric power
Control circuit and method.
Background technique
For the multiple-channel output reverse exciting switching voltage regulator using multiwinding transformer, usually chooses and therein export conduct all the way
Main output carries out output voltage feedback adjustment, other each road outputs are used as auxiliary output.Ideally, main output voltage and auxiliary defeated
Voltage meets the turn ratio relationship of transformer corresponding windings out, as long as keeping the voltage stabilization of main output, the voltage of auxiliary output
It can keep according to a certain percentage stable.But in actual conditions due to leakage inductance between transformer winding etc., the voltage of auxiliary output
It can not only change with the load-carrying variation of itself institute, can also change with the load on other roads and change, it is defeated that here it is multichannels
The cross regulation rate of power supply out.
Reverse exciting switching voltage regulator is in the case where multiple-channel output, if using main output for output voltage control feedback, in addition
The auxiliary output in several roads is not involved in feedback control, then in main output no-load and when auxiliary output is with biggish load, is easy to appear auxiliary output
Voltage declines even the case where without exporting.
Currently, there are two types of common solutions, one is fictitious load is added in main outlet side, to guarantee transformer primary side
Energy supply is sufficient, when auxiliary exports band heavy load, is still able to maintain auxiliary output voltage and keeps stablizing；One is take multiple-channel output
Voltage Feedback is adjusted, and is weighted and averaged circuit by increasing multiple-channel output voltage, to guarantee that mostly any output voltage all the way occurs
When variation, output feedback ontrol circuit can be adjusted, to guarantee that multiple-channel output voltage keeps stablizing.
The prior art, which is had the disadvantage in that first is that then often being had by the way of fictitious load, brings overheat, power consumption to increase
The problems such as being reduced with efficiency；Second is that can then sacrifice the voltage accuracy of main output using multiple-channel output Voltage Feedback, and loop control
Difficulty is bigger in the adjusting of parameter processed.
Summary of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of cross regulation rate control circuit of multiple-output electric power and side
Method, to solve the problems, such as that big existing multiple-output electric power cross regulation rate method power consumption, low efficiency and output voltage precision are low.
On the one hand, the present invention provides a kind of cross regulation rate control circuits of multiple-output electric power, including multiple-channel output
Power supply, coupling inductance L1 and feedback control circuit；Multiple-output electric power includes input power Uin, main output Vo1 and auxiliary output
Vo2；Coupling inductance L1 is connected between main output Vo1 and auxiliary output Vo2, including primary side line packet N1, secondary sideline packet N2 and iron core,
For regulating and controlling the output voltage of main output Vo1 according to the output voltage of auxiliary output Vo2；Feedback control circuit include PI controller and
PWM generator, PI controller be used for receive it is main output Vo1 output voltage as feedback signal, and based on the feedback signal with PI
As adjustment signal, regulating and controlling the PWM generator output, there is the difference of controller reference signal the PWM of corresponding duty ratio to believe
Number, and then control power supply of the input power Uin to multiple-output electric power.
Further, multiple-output electric power further includes RCD absorbing circuit, N-type power MOSFET tube V1 and transformer T1；
Transformer T1 includes primary side line packet N3, secondary sideline packet N4 and N5 and iron core；The both ends of primary side line packet N3 respectively with it is defeated
Entering the positive and negative end power supply Uin to be connected, the both ends of secondary sideline packet N4 are connect with the positive output end of auxiliary output Vo2 and negative output terminal respectively,
The both ends of secondary sideline packet N5 are connect with the positive output end of main output Vo1 and negative output terminal respectively；
RCD absorbing circuit is connected between the positive and negative end of input power Uin, including resistance R1, filter capacitor C1 and rectification
After diode D1, resistance R1 and filter capacitor C1 are in parallel, the connection with rectifier diode D1；
N-type power MOSFET tube V1, for turning on and off input power Uin.
Further, the drain electrode of N-type power MOSFET tube V1 is connect with the Same Name of Ends 2 of primary side line packet N3, and grid and PWM are sent out
The output end connection of raw device, source electrode are connect with the cathode of input power Uin.
Further, multiple-output electric power further includes rectifier diode D2, filter capacitor C2 and C4, rectifier diode D2's
Anode is connect with the Same Name of Ends 6 of secondary sideline packet N4, cathode and one end of filter capacitor C2, one end of C4 and auxiliary output Vo2
Positive output end connection, the other end of filter capacitor C4 are connect with the negative output terminal of auxiliary output Vo2.
Further, multiple-output electric power further includes rectifier diode D3 and filter capacitor C3, and rectifier diode D3 is just
Pole is connect with the Same Name of Ends 4 of secondary sideline packet N5, and the positive output end of one end and main output Vo1 of cathode and filter capacitor C3 connects
It connects, the positive output end of main output Vo1 is connect with the input terminal of the PI controller, the other end of filter capacitor C3 and main output
The negative output terminal of Vo1 connects.
Further, the Same Name of Ends 1 of coupling inductance T1 primary side line packet N1 is connect with the negative output terminal of auxiliary output Vo2, different name
End 2 is connect with the different name end 5 of the other end of filter capacitor C2 and secondary sideline packet N4；Wrap the of the same name of N2 in coupling inductance T1 pair sideline
End 4 is connect with the negative output terminal of main output Vo1, and different name end 3 is connect with the different name end 3 of secondary sideline packet N5.
Further, filter capacitor C2 is used to carry out level-one filtering, filtered electrical to the voltage after rectifier diode D2 rectification
Hold C4 to be used to carry out secondary filter by the voltage fluctuation that coupling inductance L1 is generated to the filtered voltage of the level-one.
Further, the parameter of the coupling inductance L1 is determined according to following formula:
The electrodynamic capacity of coupling inductance L1 primary side line packet N1 are as follows:
The electrodynamic capacity of coupling inductance L1 pair sideline packet N2 are as follows:
The mutual inductance of coupling inductance L1 are as follows:
Wherein, Ls1 is the leakage inductance coefficient of secondary sideline packet N5, the coil turn that Ns1 is secondary sideline packet N5, and Ls2 is secondary sideline
Wrap the leakage inductance coefficient of N4, the coil turn that Ns2 is secondary sideline packet N4, Np is the coil turn of primary side line packet N3.
According to the above technical scheme, beneficial effects of the present invention are as follows:
1, the present invention is connected main output Vo1 and auxiliary output Vo2 using coupling inductance, makes auxiliary output Vo2 output electricity
The variable signal of pressure can be by coupling inductance and main output Vo1 feedback to feedback control circuit, and then regulates and controls input power pair
The indirect closed-loop control of auxiliary output Vo2 is realized in the power supply of multiple-output electric power, is improved to the output voltage of auxiliary output Vo2
Control effect；
2, using coupling inductor, evaded adding fictitious load in the main side output Vo1 and increasing the weighting of multiple-channel output voltage and put down
Equal circuit avoids big power consumption, low efficiency, the problem that main output output voltage precision is low, closed loop control parameter adjusting difficulty is big,
Improve the cross regulation rate control problem of multiple-output electric power.
On the other hand, the invention also provides a kind of cross regulation rate control method of multiple-output electric power, this method packets
It includes:
When main output Vo1 and auxiliary output Vo2 have load, the PI controller in feedback control circuit receives main output
The output voltage of Vo1 is as feedback signal, according to the difference of the feedback signal and PI controller reference signal, the PI control
Device exports corresponding adjustment signal, and the PWM generator according to adjustment signal output there is the PWM of corresponding duty ratio to believe
Number, using turning on and off for pwm signal control N-type power MOSFET tube V1, and then regulate and control input power Uin to multichannel
The output voltage of main output Vo1 and auxiliary output Vo2 are stablized in the power supply of out-put supply；
When the load that auxiliary output Vo2 has increases, the output voltage of auxiliary output Vo2 is reduced, main by coupling inductance L1
The output voltage of output Vo1 also reduces, and the PI controller receives the output voltage of the main output Vo1 after reducing as feedback letter
Number, become larger according to the difference of the feedback signal and PI controller reference signal, the regulation letter that the PI controller output increases
Number, the pwm signal that PWM generator answers duty ratio to increase according to the adjustment signal output phase of the increase, and then increase input electricity
Power supply of the source Uin to multiple-output electric power, to restore to export burning voltage to main output Vo1 and auxiliary output Vo2.
Further, when the load that auxiliary output Vo2 has increases, electric current increases, and the iron core of the coupling inductance L1 is full
With reduce the leakage inductance coefficient of secondary sideline packet N2, and then the output for reducing the main output Vo1 of secondary sideline packet N2 connection is electric
Pressure.
Since the cross regulation rate control method of the multiple-output electric power in the present invention is identical as above-mentioned control circuit, so
This method also has technical effect corresponding with above-mentioned control circuit.
Other features and advantages of the present invention will illustrate in the following description, also, certain advantages can be from specification
In become apparent, or understand through the implementation of the invention.The objectives and other advantages of the invention can by specification with
And it is achieved and obtained in specifically noted content in attached drawing.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is the cross regulation rate control circuit schematic diagram of multiple-output electric power of the embodiment of the present invention；
Fig. 2 is the cross regulation rate control method flow chart of multiple-output electric power of the embodiment of the present invention.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention, it is not intended to limit the scope of the present invention.
Circuit embodiments:
A specific embodiment of the invention, discloses a kind of cross regulation rate control circuit of multiple-output electric power, such as
Shown in Fig. 1.The circuit includes multiple-output electric power, coupling inductance L1 and feedback control circuit；Multiple-output electric power includes input
Power supply Uin, main output Vo1 and auxiliary output Vo2；Coupling inductance L1 is connected between main output Vo1 and auxiliary output Vo2, including original
N1, secondary sideline packet N2 and iron core are wrapped in sideline, for regulating and controlling the output voltage of main output Vo1 according to the output voltage of auxiliary output Vo2；
Feedback control circuit includes PI controller and PWM generator, and PI controller is used to receive the output voltage of main output Vo1 as anti-
Feedback signal, and based on the feedback signal with the difference of PI controller reference signal as adjustment signal, it is defeated to regulate and control the PWM generator
The pwm signal of corresponding duty ratio is provided, and then controls power supply of the input power Uin to multiple-output electric power.
Wherein, the output voltage for regulating and controlling main output Vo1 according to the output voltage of auxiliary output Vo2 using coupling inductance L1, from
And the variable signal of auxiliary output Vo2 output voltage can be fed back into feedback control electricity by coupling inductance L1 and main output Vo1
Road, to realize the indirect closed-loop control of auxiliary output Vo2 output voltage.
Specifically, multiple-output electric power further includes RCD absorbing circuit, N-type power MOSFET tube V1 and transformer T1；
Transformer T1 includes primary side line packet N3, secondary sideline packet N4 and N5 and iron core；The both ends of primary side line packet N3 respectively with it is defeated
Entering the positive and negative end power supply Uin to be connected, the both ends of secondary sideline packet N4 are connect with the positive output end of auxiliary output Vo2 and negative output terminal respectively,
The both ends of secondary sideline packet N5 are connect with the positive output end of main output Vo1 and negative output terminal respectively；
RCD absorbing circuit is connected between the positive and negative end of input power Uin, including resistance R1, filter capacitor C1 and rectification
After diode D1, resistance R1 and filter capacitor C1 are in parallel, the connection with rectifier diode D1；For inhibiting due to N-type power
MOSFET pipe V1 high frequency opens peak voltage caused by shutdown, and protection MOSFET pipe V1 will not be damaged because of peak voltage.
N-type power MOSFET tube V1, for turning on and off input power Uin；When opening, input power Uin is to transformation
The primary side line packet N1 of device T1 charges, and when shutdown, the electric energy of the primary side line packet N1 storage of transformer T1 passes through secondary sideline and wraps N4 and N5
Supply main output Vo1 and auxiliary output Vo2.
Preferably, the drain electrode of N-type power MOSFET tube V1 is connect with the Same Name of Ends 2 of primary side line packet N3, and grid and PWM occur
The output end of device connects, and source electrode is connect with the cathode of input power Uin.The PWM with certain duty ratio of PWM generator output
What signal can control N-type power MOSFET tube V1 opens duration and shutdown duration, and then controls input power Uin to transformer
The duration of the primary side line packet N1 charging of T1.
In order to which auxiliary output Vo2 can export stable DC voltage, multiple-output electric power further includes rectifier diode D2, filtering
Capacitor C2 and C4, the anode of rectifier diode D2 are connect with the Same Name of Ends 6 of secondary sideline packet N4, and the one of cathode and filter capacitor C2
The positive output end connection at end, one end of C4 and auxiliary output Vo2, the negative output of the other end of filter capacitor C4 and auxiliary output Vo2
End connection.
In order to which main output Vo1 can export stable DC voltage, multiple-output electric power further includes rectifier diode D3 and filter
The anode of wave capacitor C3, rectifier diode D3 are connect with the Same Name of Ends 4 of secondary sideline packet N5, one end of cathode and filter capacitor C3 with
And the positive output end connection of main output Vo1, the positive output end of main output Vo1 connect with the input terminal of the PI controller, filter
The other end of capacitor C3 is connect with the negative output terminal of main output Vo1.
In order to allow the variable signal of auxiliary output Vo2 output voltage to feed back feedback control circuit, and then regulate and control input
The indirect closed-loop control of auxiliary output Vo2 is realized in power supply of the power supply to multiple-output electric power, and coupling inductance T1 primary side line packet N1's is same
Name end 1 is connect with the negative output terminal of auxiliary output Vo2, and the different of N4 is wrapped in the other end of different name end 2 and filter capacitor C2 and secondary sideline
Name end 5 connects；The Same Name of Ends 4 of coupling inductance T1 pair sideline packet N2 is connect with the negative output terminal of main output Vo1, different name end 3 and pair
The different name end 3 that N5 is wrapped in sideline connects.
Specifically, filter capacitor C2 is used to carry out level-one filtering, filter capacitor to the voltage after rectifier diode D2 rectification
C4 is used to carry out secondary filter by the voltage fluctuation that coupling inductance L1 is generated to the filtered voltage of the level-one, filters twice
The stability and precision of auxiliary output Vo2 output voltage can be improved.
During N1 parameter of coupling inductance is set, the parameter of the coupling inductance L1 is determined according to following formula:
The electrodynamic capacity of coupling inductance L1 primary side line packet N1 are as follows:
The electrodynamic capacity of coupling inductance L1 pair sideline packet N2 are as follows:
The mutual inductance of coupling inductance L1 are as follows:
Wherein, Ls1 is the leakage inductance coefficient of secondary sideline packet N5, the coil turn that Ns1 is secondary sideline packet N5, and Ls2 is secondary sideline
Wrap the leakage inductance coefficient of N4, the coil turn that Ns2 is secondary sideline packet N4, Np is the coil turn of primary side line packet N3.
Compared with prior art, the cross regulation rate control circuit provided in this embodiment for multiple-output electric power, one
Aspect is connected main output Vo1 and auxiliary output Vo2 using coupling inductance, makes the variable signal of auxiliary output Vo2 output voltage
Can be by coupling inductance and main output Vo1 feedback to feedback control circuit, and then regulate and control input power to multiple-output electric power
Power supply, realize it is auxiliary output Vo2 indirect closed-loop control, improve to it is auxiliary output Vo2 output voltage control effect；It is another
Aspect has been evaded using coupling inductor and has been added fictitious load in the main side output Vo1 and increase multiple-channel output voltage weighted average electricity
Road avoids big power consumption, low efficiency, the problem that main output output voltage precision is low, closed loop control parameter adjusting difficulty is big, improves
The cross regulation rate control problem of multiple-output electric power.
Embodiment of the method:
A specific embodiment of the invention, discloses a kind of cross regulation rate control method of multiple-output electric power, such as
Shown in Fig. 2, this method comprises:
When main output Vo1 and auxiliary output Vo2 have load, the PI controller in feedback control circuit receives main output
The output voltage of Vo1 is as feedback signal, according to the difference of the feedback signal and PI controller reference signal, the PI control
Device exports corresponding adjustment signal, and the PWM generator according to adjustment signal output there is the PWM of corresponding duty ratio to believe
Number, using turning on and off for pwm signal control N-type power MOSFET tube V1, and then regulate and control input power Uin to multichannel
The output voltage of main output Vo1 and auxiliary output Vo2 are stablized in the power supply of out-put supply；
In the specific implementation process, when MOSFET pipe V1 is opened, input power Uin is by MOSFET pipe V1 to transformer
T1 primary side line packet N3 charging energy-storing, the output voltage of N4 and N5 is wrapped as negative value in the secondary sideline of transformer T1 at this time, therefore diode
D2, D3 are in off state；When MOSFET pipe V1 shutdown, the electric energy of T1 primary side line packet N3 storage passes through secondary sideline and wraps N4 and N5
Release, and after rectifier diode D2 and D3 rectification, filter capacitor C2, C4 and C3 filtering, make main output Vo1 and auxiliary output
Vo2 exports stable DC voltage.
When the load that auxiliary output Vo2 has increases, the output voltage of auxiliary output Vo2 is reduced, main by coupling inductance L1
The output voltage of output Vo1 also reduces, and the PI controller receives the output voltage of the main output Vo1 after reducing as feedback letter
Number, become larger according to the difference of the feedback signal and PI controller reference signal, the regulation letter that the PI controller output increases
Number, the pwm signal that PWM generator answers duty ratio to increase according to the adjustment signal output phase of the increase, and then increase input electricity
Power supply of the source Uin to multiple-output electric power, to restore to export burning voltage to main output Vo1 and auxiliary output Vo2.
Specifically, working as the pwm signal that PWM generator answers duty ratio to increase according to the adjustment signal output phase of the increase
When, pwm signal can regulate and control the service time and turn-off time of MOSFET pipe V1, when the duty ratio of pwm signal increases, MOSFET
The service time of pipe V1 also can accordingly increase, to increase power supply of the input power Uin to multiple-output electric power.
Specifically, the electric current for flowing through coupling inductance increases when the load that auxiliary output Vo2 has increases, work as coupling inductance
When the core sataration of L1, the leakage inductance coefficient of secondary sideline packet N2 reduces, and the characteristics of according to circuit of reversed excitation, leakage inductance reduces, and corresponds to branch
The output voltage on road can also reduce, and then reduce the output voltage of the main output Vo1 of secondary sideline packet N2 connection.
On the one hand the cross regulation rate control method of multiple-output electric power in the embodiment of the present invention utilizes coupling inductance will
Main output Vo1 is connected with auxiliary output Vo2, allow the variable signal of auxiliary output Vo2 output voltage by coupling inductance and
Main output Vo1 feedback regulates and controls power supply of the input power to multiple-output electric power to feedback control circuit, realizes auxiliary output
The indirect closed-loop control of Vo2 improves the control effect of the output voltage to auxiliary output Vo2；On the other hand, using coupling inductance
Device has been evaded and has added fictitious load in the main side output Vo1 and increase multiple-channel output voltage weighted average circuit, avoids that power consumption is big, effect
Rate is low, main output output voltage precision is low, closed loop control parameter adjusts the big problem of difficulty, improves the friendship of multiple-output electric power
Pitch regulation control problem.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of cross regulation rate control circuit of multiple-output electric power, which is characterized in that including multiple-output electric power, coupling electricity
Feel L1 and feedback control circuit；
The multiple-output electric power includes input power Uin, main output Vo1 and auxiliary output Vo2；
The coupling inductance L1 is connected between the main output Vo1 and auxiliary output Vo2, including primary side line packet N1, secondary sideline packet
N2 and iron core, for regulating and controlling the output voltage of main output Vo1 according to the output voltage of auxiliary output Vo2；
The feedback control circuit includes PI controller and PWM generator, and the PI controller is used to receive the defeated of main output Vo1
Voltage is believed as feedback signal, and according to the difference of the feedback signal and the PI controller reference signal as regulation out
Number, regulating and controlling the PWM generator output has the pwm signal of corresponding duty ratio, and then controls the input power Uin to multichannel
The power supply of out-put supply.
2. a kind of cross regulation rate control circuit of multiple-output electric power according to claim 1, which is characterized in that described
Multiple-output electric power further includes RCD absorbing circuit, N-type power MOSFET tube V1 and transformer T1；
The transformer T1 includes primary side line packet N3, secondary sideline packet N4 and N5 and iron core；Distinguish at the both ends of the primary side line packet N3
Be connected with the positive and negative end input power Uin, it is described pair sideline packet N4 both ends respectively with it is auxiliary output Vo2 positive output end and bear defeated
The both ends of outlet connection, the pair sideline packet N5 are connect with the positive output end of main output Vo1 and negative output terminal respectively；
The RCD absorbing circuit is connected between the positive and negative end of the input power Uin, including resistance R1, filter capacitor C1 and
After rectifier diode D1, the resistance R1 and the filter capacitor C1 are in parallel, the connection with the rectifier diode D1；
The N-type power MOSFET tube V1, for turning on and off input power Uin.
3. a kind of cross regulation rate control circuit for multiple-channel output reverse exciting switching voltage regulator according to claim 2,
Be characterized in that, the drain electrode of the N-type power MOSFET tube V1 is connect with the Same Name of Ends 2 of the primary side line packet N3, grid with it is described
The output end of PWM generator connects, and source electrode is connect with the cathode of the input power Uin.
4. a kind of cross regulation rate control circuit of multiple-output electric power according to claim 3, which is characterized in that described
Multiple-output electric power further includes rectifier diode D2, filter capacitor C2 and C4, anode and the pair of the rectifier diode D2
The Same Name of Ends 6 that N4 is wrapped in sideline connects, cathode and one end of the filter capacitor C2, one end of C4 and the auxiliary output Vo2
Positive output end connection, the other end of the filter capacitor C4 are connect with the negative output terminal of the auxiliary output Vo2.
5. a kind of cross regulation rate control circuit of multiple-output electric power according to claim 4, which is characterized in that described
Multiple-output electric power further includes the positive and secondary sideline of rectifier diode D3 and filter capacitor C3, the rectifier diode D3
The Same Name of Ends 4 for wrapping N5 connects, and cathode is connect with the positive output end of one end of the filter capacitor C3 and the main output Vo1,
The positive output end of the main output Vo1 is connect with the input terminal of the PI controller, the other end of the filter capacitor C3 and institute
State the negative output terminal connection of main output Vo1.
6. a kind of cross regulation rate control circuit of multiple-output electric power according to claim 5, which is characterized in that described
The Same Name of Ends 1 of coupling inductance T1 primary side line packet N1 is connect with the negative output terminal of the auxiliary output Vo2, different name end 2 and the filtering
The different name end 5 of the other end of capacitor C2 and the secondary sideline packet N4 connect；The coupling inductance T1 pair sideline packet N2's is of the same name
End 4 is connect with the negative output terminal of the main output Vo1, and different name end 3 is connect with the different name end 3 of the secondary sideline packet N5.
7. a kind of cross regulation rate control circuit of multiple-output electric power according to claim 6, which is characterized in that described
Filter capacitor C2 be used for the rectifier diode D2 rectification after voltage carry out level-one filtering, the filter capacitor C4 for pair
The filtered voltage of level-one carries out secondary filter by the voltage fluctuation that the coupling inductance L1 is generated.
8. a kind of cross regulation rate control circuit of multiple-output electric power according to claim 2, which is characterized in that according to
Following formula determine the parameter of the coupling inductance L1:
The electrodynamic capacity of the coupling inductance L1 primary side line packet N1 are as follows:
The electrodynamic capacity of the coupling inductance L1 pair sideline packet N2 are as follows:
The mutual inductance of the coupling inductance L1 are as follows:
Wherein, Ls1 is the leakage inductance coefficient of secondary sideline packet N5, the coil turn that Ns1 is secondary sideline packet N5, and Ls2 is that N4 is wrapped in secondary sideline
Leakage inductance coefficient, Ns2 be coil turn that N4 is wrapped in secondary sideline, Np is the coil turn of primary side line packet N3.
9. a kind of cross regulation rate control method of multiple-output electric power, which is characterized in that utilize claim 1-8 any one
The cross regulation rate control circuit for multiple-channel output reverse exciting switching voltage regulator, this method comprises:
When main output Vo1 and auxiliary output Vo2 have load, the PI controller in feedback control circuit receives main output Vo1
Output voltage as feedback signal, according to the difference of the feedback signal and PI controller reference signal, the PI controller
Corresponding adjustment signal is exported, the PWM generator has the pwm signal of corresponding duty ratio according to adjustment signal output,
Using turning on and off for pwm signal control N-type power MOSFET tube V1, and then it is defeated to multichannel to regulate and control input power Uin
The output voltage of main output Vo1 and auxiliary output Vo2 are stablized in the power supply of power supply out；
When the load that auxiliary output Vo2 has increases, the output voltage of auxiliary output Vo2 is reduced, by coupling inductance L1, main output
The output voltage of Vo1 also reduces, and the PI controller receives the output voltage of the main output Vo1 after reducing as feedback signal,
Become larger according to the difference of the feedback signal and PI controller reference signal, the adjustment signal that the PI controller output increases,
The pwm signal that PWM generator answers duty ratio to increase according to the adjustment signal output phase of the increase, and then increase input power
Power supply of the Uin to multiple-output electric power, to restore to export burning voltage to main output Vo1 and auxiliary output Vo2.
10. a kind of cross regulation rate control method of multiple-output electric power according to claim 9, which is characterized in that when
When the load that auxiliary output Vo2 has increases, electric current increases, the core sataration of the coupling inductance L1, makes the leakage of secondary sideline packet N2
Feel coefficient to reduce, and then reduces the output voltage of the main output Vo1 of secondary sideline packet N2 connection.
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