CN110311550B - Voltage-sharing control method for two-module ISOP (inverse-synchronous Power-on-demand) DC-DC converter - Google Patents
Voltage-sharing control method for two-module ISOP (inverse-synchronous Power-on-demand) DC-DC converter Download PDFInfo
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- CN110311550B CN110311550B CN201910669081.7A CN201910669081A CN110311550B CN 110311550 B CN110311550 B CN 110311550B CN 201910669081 A CN201910669081 A CN 201910669081A CN 110311550 B CN110311550 B CN 110311550B
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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
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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
- H02M1/0083—Converters characterised by their input or output configuration
Abstract
The invention discloses a voltage-sharing control method for a two-module ISOP (inverse synchronous rectification and inverse boost) DC-DC converter, belonging to the technical field of control in an electric energy conversion device. The method can realize input voltage balancing and output current sharing under the condition of using one voltage outer ring, and reduces the complexity of a control circuit. The method takes the input voltages of two DC-DC converters as feedback signals of an input voltage regulator of the other side, and the output signal of the output voltage regulator is the reference of the input voltage regulator. The modulation signal can be generated in two ways: 1. the output of the output voltage regulator can be directly used as a modulation signal; 2. the output of the output voltage regulator is used as the reference of the current regulator, and the output of the current regulator is used as a modulation signal. The modulation signal finally generates a driving signal for controlling the work of the power switching tubes of the two DC-DC converters through the modulation driving circuit. The method has the advantages of simple control circuit structure, convenient realization and the like.
Description
The technical field is as follows:
the invention relates to a control technology in an electric energy conversion device, in particular to a voltage-sharing control method for a two-module ISOP (input-output-series-parallel) direct-current converter.
Background art:
the input-series output-parallel (ISOP) DC-DC converter can reduce the switching stress of the switching tube, and is suitable for DC conversion occasions with high-voltage input and large-current output. In order to ensure reliable operation of the converter, it is necessary to ensure voltage sharing of the input voltage and current sharing of the output current.
The method is the simplest method by adopting the same duty ratio, and because the duty ratios are equal, the imbalance of the input voltage can cause the module with high input voltage to extract larger current, thereby achieving the automatic equalization of the input voltage. However, this control strategy requires that the parameters of all modules must be well matched, otherwise the voltage-sharing effect is not good. The double-loop control strategy is controlled by only one voltage loop and two current loops, namely the output of the voltage loop is used as the given values of the two current loops, the outputs of the two current loops are respectively intersected with sawtooth waves of the two control chips to generate respective duty ratios, and the given values of the two current loops are equal, so that current sharing can be realized in a steady state. However, if a module input voltage has a disturbance causing it to increase, the feedback signal of the output voltage decreases its duty cycle through the control loop, so its average input current will decrease, which will result in a further increase of the input voltage of the corresponding module, while the input voltage of the other module will decrease further, so that voltage equalization cannot be achieved. The double-loop cross control strategy is also controlled by only one voltage loop and two current loops. The feedback signals of the current inner rings of the module 1 and the module 2 are respectively the filter inductance current signals of the module 2 and the module 1, and although the control mode can output current sharing, the input voltage sharing can be ensured under the condition of ensuring the parameter consistency. The method adopts a three-loop control strategy, namely an output voltage outer loop, an input voltage equalizing outer loop and a current inner loop, and although the method can simultaneously ensure input voltage equalizing and output current equalizing, the method uses two voltage outer loops and is relatively complex to control. There is therefore a need for a simpler and more efficient voltage sharing control method that optimizes the converter performance.
The invention content is as follows:
in view of the above, the present invention provides a voltage-sharing control method for a two-module ISOP dc-dc converter, so as to solve the problems of complicated control and unstable system caused by adopting multiple voltage outer loops in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention discloses a voltage-sharing control method for a two-module ISOP (inverse synchronous compensator) DC-DC converter, wherein a control structure involved in the voltage-sharing control method for the two-module ISOP DC-DC converter comprises an input power supply VinAn input voltage-dividing capacitor Cin1And an input voltage-dividing capacitor Cin2A DC-DC converter 1, a DC-DC converter 2 and an output filter capacitor CfLoad RLAn output voltage regulator, an input voltage regulator 1 and an input voltage regulator 2, a modulation signal generation circuit 1 and a modulation signal generation circuit 2, a modulation drive circuit 1 and a modulation drive circuit 2, an input power supply VinThe anode is connected to an input voltage-dividing capacitor Cin1Anode of (2), input power supply VinThe negative electrode is connected to an input voltage-dividing capacitor Cin2Negative pole of (2), input voltage-dividing capacitor Cin1Negative pole and input voltage-dividing capacitor Cin2Is connected with the positive pole of the input voltage-dividing capacitor Cin1To a direct-to-direct conversionInput terminal of the device 1, input voltage-dividing capacitor Cin2Connected to the input end of the DC-DC converter 2, the DC-DC converter 1 is connected with the DC-DC converter 2 in parallel and then connected to the output filter capacitor CfAnd is loaded with RLAnd output filter capacitor CfParallel connection, output voltage voOutput voltage feedback signal vo_fConnected to the inverting terminal of the output voltage regulator, a voltage reference signal VrefIs connected to the non-inverting terminal of the output voltage regulator, the output signal of the output voltage regulator is connected to the non-inverting terminals of the input voltage regulator 1 and the input voltage regulator 2, and is input to the voltage dividing capacitor Cin1Input voltage feedback signal vin1_fConnected to the inverting terminal of the input voltage regulator 2, and input the voltage dividing capacitor Cin2Input voltage feedback signal vin2_fThe voltage-sharing control method of the two-module ISOP direct-current converter comprises the following steps that the voltage-sharing control method comprises the following steps that the output ends of an input voltage regulator 1 and an input voltage regulator 2 are connected to the input ends of a modulation signal generating circuit 1 and a modulation signal generating circuit 2 respectively, the output ends of the modulation signal generating circuit 1 and the modulation signal generating circuit 2 are connected to a modulation driving circuit 1 and a modulation driving circuit 2 respectively, and the output ends of the modulation driving:
sampling the output voltage voObtaining an output voltage feedback signal vo_fIs compared with a voltage reference signal VrefThe difference signal is sent to the output voltage regulator to obtain the output voltage error amplified signal v of the output voltage regulatoroe；
Sampling input voltage-dividing capacitor Cin1The input voltage of the voltage converter obtains an input voltage feedback signal vin1_fIs compared with the output voltage error amplified signal voeThe difference is sent to the input voltage regulator 2 to obtain an input voltage error amplification signal v of the input voltage regulator 2ie2；
Sampling input voltage-dividing capacitor Cin2Said input voltage feedback signal v is derived from said input voltagein2_fIs compared with the output voltage error amplified signal voeDifference is made and then input voltage is adjustedA regulator 1 for obtaining an input voltage error amplified signal v of the input voltage regulator 1ie1；
Amplifying the input voltage error signal vie1Sending the signal into a modulation signal generating circuit 1 to obtain a modulation signal vr1Modulating said modulated signal vr1The signal is sent to a modulation driving circuit 1, and a driving signal generated by the modulation driving circuit 1 controls the work of a DC-DC converter 1; amplifying the input voltage error signal vie2Sending the signal into a modulation signal generating circuit 2 to obtain a modulation signal vr2Modulating said modulated signal vr2The driving signal is sent to the modulation driving circuit 2, and the driving signal generated by the modulation driving circuit 2 controls the operation of the dc-dc converter 2.
Preferably, the modulation signal generation circuit 1 and the modulation signal generation circuit 2 are both a through circuit, that is, an input voltage error amplified signal v is directly amplifiedie1And input voltage error amplified signal vie2Respectively as modulated signals vr1And a modulated signal vr2。
Preferably, the modulation signal generation circuit 1 and the modulation signal generation circuit 2 are both current regulators.
The method realizes the balance of the input voltage by using a mode that an input voltage inner loop tracks the same voltage reference (the output of an output voltage controller), and compared with the prior art, the method has the following beneficial effects:
(1) the structure of only one voltage outer ring is used, so that the design is simpler;
(2) for an analog circuit, the using amount of operational amplifier is reduced, and the cost is reduced;
(3) the system is more easily stabilized by the structure that only one voltage outer ring exists.
Description of the drawings:
fig. 1 is a schematic structural diagram of an input voltage-sharing control method for a two-module ISOP dc-dc converter according to embodiment 1 of the present invention.
Fig. 2 is a simulation diagram of main waveforms in a two-module ISOP dc-dc converter according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of an input voltage-sharing control method for a two-module ISOP dc-dc converter according to embodiment 2 of the present invention.
Fig. 4 is a simulation diagram of main waveforms in a two-module ISOP dc-dc converter according to embodiment 2 of the present invention.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a voltage-sharing control method for a two-module ISOP (inverse synchronous compensator) DC-DC converter, wherein a control structure involved in the voltage-sharing control method for the two-module ISOP DC-DC converter comprises an input power supply VinAn input voltage-dividing capacitor Cin1And Cin2A DC-DC converter 1, a DC-DC converter 2 and an output filter capacitor CfLoad RLAn output voltage regulator, an input voltage regulator 1 and an input voltage regulator 2, a modulation signal generation circuit 1 and a modulation signal generation circuit 2, a modulation drive circuit 1 and a modulation drive circuit 2, an input power supply VinThe anode is connected to an input voltage-dividing capacitor Cin1Anode of (2), input power supply VinThe negative electrode is connected to an input voltage-dividing capacitor Cin2Negative pole of (2), input voltage-dividing capacitor Cin1Negative pole and input voltage-dividing capacitor Cin2Is connected with the positive pole of the input voltage-dividing capacitor Cin1Connected to the input end of the DC-DC converter 1 and input the voltage dividing capacitor Cin2Connected to the input end of the DC-DC converter 2#, the DC-DC converter 1 and the DC-DC converter 2 are connected in parallel to the output filter capacitor CfAnd a load RLSaid output voltage voIs sampled signal vo_fThe output signal of the output voltage regulator is respectively connected to the non-inverting terminal and the non-inverting terminal of the input voltage regulator 1 and the non-inverting terminal of the input voltage regulator 2, and is input to a voltage dividing capacitor Cin1Is sampled by a voltage vin1_fAnd an input voltage-dividing capacitor Cin2Is sampled by a voltage vin2_fThe output ends of the input voltage regulator 1 and the input voltage regulator 2 are respectively connected to the inverting ends of the input voltage regulator 2 and the input voltage regulator 1, the output ends of the input voltage regulator 1 and the input voltage regulator 2 are respectively connected to the modulation signal generating circuit 1 and the modulation signal generating circuit 2, the output ends of the modulation signal generating circuit 1 and the modulation signal generating circuit 2 are respectively connected to the modulation driving circuit 1 and the modulation driving circuit 2, and the output ends of the modulation driving circuit 1 and the modulation driving circuit 2 respectively drive the direct-current converter 1 and the direct-current converter 2 to work. The modulation signal generating circuit 1 and the modulation signal generating circuit 2 are preferably direct circuits or current regulators, and the voltage-sharing control method of the two-module ISOP direct-current-direct-current converter comprises the following steps:
s1 sampling the output voltage voObtaining an output voltage feedback signal vo_fIs compared with a voltage reference signal VrefThe difference signal is sent to the output voltage regulator to obtain the output voltage error amplified signal v of the output voltage regulatoroe；
S2 sampling input voltage-dividing capacitor Cin1The input voltage of the voltage converter obtains an input voltage feedback signal vin1_fIs compared with the output voltage error amplified signal voeThe difference is sent to the input voltage regulator 2 to obtain an input voltage error amplification signal v of the input voltage regulator 2ie2；
Sampling input voltage-dividing capacitor Cin2Said input voltage feedback signal v is derived from said input voltagein2_fIs compared with the output voltage error amplified signal voeThe difference is sent to the input voltage regulator 1 to obtain an input voltage error amplification signal v of the input voltage regulator 1ie1；
S3, amplifying the input voltage error signal vie1Sending the signal into a modulation signal generating circuit 1 to obtain a modulation signal vr1Modulating said modulated signal vr1The signal is sent to a modulation driving circuit 1, and a driving signal generated by the modulation driving circuit 1 controls the work of a DC-DC converter 1; amplifying the input voltage error signal vie2Sending the signal into a modulation signal generating circuit 2 to obtain a modulation signal vr2Modulating said modulated signal vr2Feed modulation driveAnd the circuit 2 modulates the driving signal generated by the driving circuit 2 to control the operation of the DC-DC converter 2.
In step S3, the modulation signal generation circuits 1 and 2 preferably use a pass-through circuit or a current regulator, by which the input voltage error amplified signal v can be directly amplifiedie1And input voltage error amplified signal vie2Respectively as modulated signals vr1And a modulated signal vr2(ii) a The current regulator can increase overcurrent limitation and better realize voltage-sharing control.
Example 1
An embodiment of the invention discloses a voltage-sharing control method for a two-module ISOP (inverse synchronous rectification and Power) DC-DC converter, wherein a control structure involved in the voltage-sharing control method for the two-module ISOP DC-DC converter is shown in figure 1 and comprises an input power supply VinAn input voltage-dividing capacitor Cin1And Cin2A DC-DC converter 1, a DC-DC converter 2 and an output filter capacitor CfLoad RLAn output voltage regulator, an input voltage regulator 1 and an input voltage regulator 2, a current regulator 1 and a current regulator 2, a modulation drive circuit 1 and a modulation drive circuit 2, an input power supply VinThe anode is connected to an input voltage-dividing capacitor Cin1Anode of (2), input power supply VinThe negative electrode is connected to an input voltage-dividing capacitor Cin2Negative pole of (2), input voltage-dividing capacitor Cin1Negative pole and input voltage-dividing capacitor Cin2Is connected with the positive pole of the input voltage-dividing capacitor Cin1Connected to the input end of the DC-DC converter 1 and input the voltage dividing capacitor Cin2Connected to the input end of the DC-DC converter 2#, the DC-DC converter 1 and the DC-DC converter 2 are connected in parallel to the output filter capacitor CfAnd a load RLSaid output voltage voIs sampled signal vo_fThe output signal of the output voltage regulator is respectively connected to the non-inverting terminal and the non-inverting terminal of the input voltage regulator 1 and the non-inverting terminal of the input voltage regulator 2, and is input to a voltage dividing capacitor Cin1Is sampled by a voltage vin1_fAnd an input voltage-dividing capacitor Cin2Is sampled by a voltage vin2_fInverse connected to the input voltage regulator 2 and the input voltage regulator 1 respectivelyAt a phase end, the outputs of the input voltage regulator 1 and the input voltage regulator 2 are respectively connected to the current regulator 1 and the current regulator 2, the outputs of the current regulator 1 and the current regulator 2 are respectively connected to the modulation drive circuit 1 and the modulation drive circuit 2, the outputs of the modulation drive circuit 1 and the modulation drive circuit 2 respectively drive the operation of the DC-DC converter 1 and the DC-DC converter 2, and the voltage-sharing control method of the two-module ISOP DC-DC converter comprises the following steps:
s1 sampling the output voltage voObtaining an output voltage feedback signal vo_fIs compared with a voltage reference signal VrefThe difference signal is sent to the output voltage regulator to obtain the output voltage error amplified signal v of the output voltage regulatoroe；
S2 sampling input voltage-dividing capacitor Cin1The input voltage of the voltage converter obtains an input voltage feedback signal vin1_fIs compared with the output voltage error amplified signal voeThe difference is sent to the input voltage regulator 2 to obtain an input voltage error amplification signal v of the input voltage regulator 2ie2；
Sampling input voltage-dividing capacitor Cin2Said input voltage feedback signal v is derived from said input voltagein2_fIs compared with the output voltage error amplified signal voeThe difference is sent to the input voltage regulator 1 to obtain an input voltage error amplification signal v of the input voltage regulator 1ie1；
S3, mixing vie1And vie2Respectively fed into the in-phase ends of the current regulator 1 and the current regulator 2, and a current feedback signal i of the DC-DC converter 1 is obtained by samplingf1And a current feedback signal i of the DC-DC converter 2f2And will if1And if2Respectively fed into the inverting terminals of the current regulator 1 and the current regulator 2 to respectively obtain the current error amplification signals i of the current regulator 1 and the current regulator 2e1And ie2And amplifying the current error signal ie1And ie2Respectively as modulated signals vr1And vr2Modulating the signal vr1The signal is sent to a modulation driving circuit 1, and a driving signal generated by the modulation driving circuit 1 controls the work of a DC-DC converter 1;modulating signal vr2The driving signal is sent to the modulation driving circuit 2, and the driving signal generated by the modulation driving circuit 2 controls the operation of the dc-dc converter 2.
FIG. 2 is a simulated waveform diagram, v, of the control method in embodiment 1 of the present inventionin1And vin2Are respectively the voltage, i, on the input voltage-dividing capacitorL1And iL2Respectively, the current on the output filter inductor, voFor outputting voltage, the method of the invention can ensure that the output voltage of the two modules of ISOP direct-current converters is stable and the input voltage and the output current are equally divided.
Example 2
An embodiment of the invention discloses a voltage-sharing control method for a two-module ISOP (inverse synchronous rectification and direct current) DC-DC converter, wherein a control structure involved in the voltage-sharing control method for the two-module ISOP DC-DC converter is shown in figure 3 and comprises an input power supply VinAn input voltage-dividing capacitor Cin1And Cin2A DC-DC converter 1, a DC-DC converter 2 and an output filter capacitor CfLoad RLAn output voltage regulator, an input voltage regulator 1 and 2, a modulation drive circuit 1 and 2, an input power supply VinThe anode is connected to an input voltage-dividing capacitor Cin1Anode of (2), input power supply VinThe negative electrode is connected to an input voltage-dividing capacitor Cin2Negative pole of (2), input voltage-dividing capacitor Cin1Negative pole and input voltage-dividing capacitor Cin2Is connected with the positive pole of the input voltage-dividing capacitor Cin1Connected to the input end of the DC-DC converter 1 and input the voltage dividing capacitor Cin2Connected to the input end of the DC-DC converter 2, the DC-DC converter 1 and the DC-DC converter 2 are connected in parallel to the output filter capacitor CfAnd a load RLSaid output voltage voIs sampled signal vo_fThe output signal of the output voltage regulator is respectively connected to the non-inverting terminal and the non-inverting terminal of the input voltage regulator 1 and the non-inverting terminal of the input voltage regulator 2, and is input to a voltage dividing capacitor Cin1Is sampled by a voltage vin1_fAnd an input voltage-dividing capacitor Cin2Is sampled by a voltage vin2_fAre respectively connected to input voltagesThe voltage-sharing control method of the two-module ISOP direct-current converter comprises the following steps that the output ends of a regulator 2 and an input voltage regulator 1 are respectively connected to a modulation driving circuit 1 and a modulation driving circuit 2, the output ends of the input voltage regulator 1 and the input voltage regulator 2 are respectively connected to the modulation driving circuit 1 and the modulation driving circuit 2, the output ends of the modulation driving circuit 1 and the modulation driving circuit 2 are respectively used for driving the direct-current converter 1 and the direct-current converter 2 to work, and the voltage-sharing control method of the two-:
s1 sampling the output voltage voObtaining an output voltage feedback signal vo_fIs compared with a voltage reference signal VrefThe difference signal is sent to the output voltage regulator to obtain the output voltage error amplified signal v of the output voltage regulatoroe；
S2 sampling input voltage-dividing capacitor Cin1The input voltage of the voltage converter obtains an input voltage feedback signal vin1_fIs compared with the output voltage error amplified signal voeThe difference is sent to the input voltage regulator 2 to obtain an input voltage error amplification signal v of the input voltage regulator 2ie2；
Sampling input voltage-dividing capacitor Cin2Said input voltage feedback signal v is derived from said input voltagein2_fIs compared with the output voltage error amplified signal voeThe difference is sent to the input voltage regulator 1 to obtain an input voltage error amplification signal v of the input voltage regulator 1ie1；
S3 directly amplifying the input voltage error signal vie1And input voltage error amplified signal vie2Respectively as modulated signals vr1And a modulated signal vr2Modulating the signal vr1The signal is sent to a modulation driving circuit 1, and a driving signal generated by the modulation driving circuit 1 controls the work of a DC-DC converter 1; modulating signal vr2The driving signal is sent to the modulation driving circuit 2, and the driving signal generated by the modulation driving circuit 2 controls the operation of the dc-dc converter 2.
FIG. 4 is a simulated waveform diagram, v, of the control method in embodiment 2 of the present inventionin1And vin2Are respectively the voltage, i, on the input voltage-dividing capacitorL1And iL2Respectively, the current on the output filter inductor, voTo output voltage, seeThe method can stabilize the output voltage of the two modules of ISOP direct-current converters and ensure the equal division of the input voltage and the equal division of the output current.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A voltage-sharing control method for two-module ISOP DC-DC converter includes such steps as providing an input power supply VinAn input voltage-dividing capacitor Cin1And an input voltage-dividing capacitor Cin2A DC-DC converter 1, a DC-DC converter 2 and an output filter capacitor CfLoad RLAn output voltage regulator, an input voltage regulator 1 and an input voltage regulator 2, a modulation signal generation circuit 1 and a modulation signal generation circuit 2, a modulation drive circuit 1 and a modulation drive circuit 2, an input power supply VinThe anode is connected to an input voltage-dividing capacitor Cin1Anode of (2), input power supply VinThe negative electrode is connected to an input voltage-dividing capacitor Cin2Negative pole of (2), input voltage-dividing capacitor Cin1Negative pole and input voltage-dividing capacitor Cin2Is connected with the positive pole of the input voltage-dividing capacitor Cin1Connected to the input end of the DC-DC converter 1 and input the voltage dividing capacitor Cin2Is connected to the input of the dc-dc converter 2,the output end of the DC-DC converter 1 and the output end of the DC-DC converter 2 are connected in parallel and then connected to an output filter capacitor CfAnd is loaded with RLAnd output filter capacitor CfParallel connection, output voltage voOutput voltage feedback signal vo_fConnected to the inverting terminal of the output voltage regulator, a voltage reference signal VrefIs connected to the non-inverting terminal of the output voltage regulator, the output signal of the output voltage regulator is connected to the non-inverting terminals of the input voltage regulator 1 and the input voltage regulator 2, and is input to the voltage dividing capacitor Cin1Input voltage feedback signal vin1_fConnected to the inverting terminal of the input voltage regulator 2, and input the voltage dividing capacitor Cin2Input voltage feedback signal vin2_fThe voltage-sharing control method is characterized in that the voltage-sharing control method of the two-module ISOP direct-current converter comprises the following steps:
sampling the output voltage voObtaining an output voltage feedback signal vo_fIs compared with a voltage reference signal VrefThe difference signal is sent to the output voltage regulator to obtain the output voltage error amplified signal v of the output voltage regulatoroe；
Sampling input voltage-dividing capacitor Cin1The input voltage of the voltage converter obtains an input voltage feedback signal vin1_fIs compared with the output voltage error amplified signal voeThe difference is sent to the input voltage regulator 2 to obtain an input voltage error amplification signal v of the input voltage regulator 2ie2；
Sampling input voltage-dividing capacitor Cin2Said input voltage feedback signal v is derived from said input voltagein2_fIs compared with the output voltage error amplified signal voeThe difference is sent to the input voltage regulator 1 to obtain the input of the input voltage regulator 1Voltage error amplified signal vie1；
Amplifying the input voltage error signal vie1Sending the signal into a modulation signal generating circuit 1 to obtain a modulation signal vr1Modulating said modulated signal vr1The signal is sent to a modulation driving circuit 1, and a driving signal generated by the modulation driving circuit 1 controls the work of a DC-DC converter 1; amplifying the input voltage error signal vie2Sending the signal into a modulation signal generating circuit 2 to obtain a modulation signal vr2Modulating said modulated signal vr2The driving signal is sent to the modulation driving circuit 2, and the driving signal generated by the modulation driving circuit 2 controls the operation of the dc-dc converter 2.
2. The voltage-sharing control method for the two-module ISOP DC-DC converter according to claim 1, wherein the modulation signal generating circuit 1 and the modulation signal generating circuit 2 are both direct circuits, i.e. the input voltage error amplifying signal v is directly amplifiedie1And input voltage error amplified signal vie2Respectively as modulated signals vr1And a modulated signal vr2。
3. The voltage-sharing control method for the two-module ISOP DC-DC converter according to claim 1, wherein the modulation signal generating circuit 1 and the modulation signal generating circuit 2 are both current regulators.
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