Real-time synchronous control method, system and module power supply of power converter

Abstract

The application discloses a real-time synchronous control method, system and module power supply of a power converter. The method can be used for real-time synchronous control of the power converter in the module power supply, and comprises the following steps: S1: an external input of a synchronous signal with a real-time changeable period and phase is distributed to each power converter; S2: each power converter obtains the period and phase of the synchronous signal under a respective clock; S3: each power converter calculates the duty cycle of each power converter according to respective control requirements; and S4: each power converter generates a PWM control signal with a high level time being the product of the calculated duty cycle and period, and the period and phase being the same as the synchronous signal, to control the power switch device of the power converter. The control method can control the output of each module power supply, effectively realize the carrier signal synchronization of each power supply module in real time, avoid the generation of circulating current among the modules, improve the efficiency and avoid damage to the load.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of module power supply parallel control, and particularly relates to a real-time synchronous control method and system of a power converter and a module power supply. BACKGROUND

[0002] In a module power supply parallel system, the output characteristics of each module are inevitably slightly different, although there are circuits or software in the parallel system to make the output currents of each module in the system average. However, the switching phases of the switching tubes of different modules are not the same, which also causes a current loop between two module power supplies, forming a circulating current. Generally, the circulating current will interfere with the power supply system, affect the normal work of components and devices, and also cause unnecessary loss and affect the efficiency. Moreover, as the output current becomes larger, the circulating current becomes larger, which will cause a great impact on the load and damage the load. Therefore, a method and system for synchronously controlling the power converters of each power supply in a module power supply parallel system are needed to reduce system loss and avoid damaging the load.

[0003] The traditional switching frequency synchronization method of a converter mostly uses an external input synchronization signal as a trigger source to reset the period of the switching frequency of the converter at each rising edge of the input synchronization signal. Although this method is simple and effective, it has a fatal defect. On the one hand, this method is only applicable to the condition that the frequency of the external synchronization signal is higher than the frequency of the converter itself, and cannot be applied to the condition that the frequency of the external synchronization signal is lower than the frequency of the converter itself. On the other hand, when the frequency of the external synchronization signal suddenly changes, the frequency of the converter itself will also suddenly change, which is very unfavorable to the converter and is likely to cause abnormal conditions such as loss of duty ratio or direct through, resulting in failure of the converter. SUMMARY

[0004] The purpose of the present application is to provide a real-time synchronous control method of a power converter, which provides an external synchronization signal with adjustable period and phase for each power converter in each power supply, and makes each power converter obtain the period and phase of the synchronization signal to gradually generate a PWM control signal with the same phase and period, to control the on-off of the power switching device in each power converter, and to realize synchronous control of each module power supply in a module power supply parallel system.

[0005] Another purpose of the present application is to provide a synchronous control system that can implement the above-mentioned multi-mode control method, and a module power supply with the above-mentioned synchronous control system.

[0006] Technical solution: The real-time synchronous control method of a power converter provided by the present application comprises the following steps:

[0007] S1: input a periodic and phase real-time changeable synchronization signal from outside, and distribute the synchronization signal to each power converter;

[0008] S2: each power converter acquires the period and phase of the synchronization signal under its own clock;

[0009] S3: each power converter calculates the duty cycle of each power converter according to its own control requirement;

[0010] S4: each power converter generates a PWM control signal with the same period and phase as the synchronization signal, and the high level time of the PWM control signal is the product of the calculated duty cycle and the period, to control the power switch device of the power converter.

[0011] Further, the step S2 comprises the following steps:

[0012] S2.1: generate a first slope signal S cnt accumulated with a first crystal oscillator clock, and a second slope signal S cnt accumulated with a second crystal oscillator clock, and a auxiliary signal with the initial value of the duty cycle and the period length being set values, and the period of the second slope signal is synchronized with the auxiliary signal; cnt the length of P

[0013] S2.2: capture the rising edge of the synchronization signal, and record the count value of the first slope signal at the rising edge of the synchronization signal, and the difference between the count values of the first slope signal corresponding to adjacent rising edges is the period monitoring value of the synchronization signal;

[0014] S2.3: calculate the average of the period monitoring values obtained in the same P cnt period as the period value p ref of the synchronization signal;

[0015] S2.4: generate another second slope signal accumulated with a second crystal oscillator clock, and an auxiliary signal with the initial value of the duty cycle and the period length being set values, and the period of the second slope signal is synchronized with the auxiliary signal;

[0016] S2.5: capture the rising edge of the synchronization signal, and record the count value of the second slope signal at the rising edge of the synchronization signal, and adjust the period length of the auxiliary signal until the count value of the second slope signal at the rising edge of the synchronization signal is within the set threshold interval.

[0017] Further, the step S2.5 comprises the following steps:

[0018] S2.51: calculate the absolute value of the difference d ref between the period value p mid of the synchronization signal and the period value p tp of the auxiliary signal after the last adjustment, and if |d tp | is greater than a set threshold dth then jump to step S2.52; if |d tp is less than or equal to a set threshold value d th then jump to step S2.53;

[0019] S2.52: if d tp is positive, increase the period value of the auxiliary signal by a first gradient value; if d tp is negative, decrease the period value of the auxiliary signal by a first gradient value;

[0020] S2.53: capture the rising edge of the synchronization signal and record the count value C sync of the second ramp signal corresponding to the rising edge time;

[0021] S2.54: when C 1t ≤ C sync ≤ C 2t , and C sync > C 3t , decrease the period value p mid of the auxiliary signal by a second gradient value; when C 1t ≤ C sync ≤ C 2t , and C sync ≤ C 3t , increase the period value p mid of the auxiliary signal by a second gradient value;

[0022] S2.55: repeat steps S2.51 to S2.54 until C sync < C 1t or C sync > C 2t ;

[0023] wherein C 1t , C 2t and C 3t are constant values set according to the obtained period value p ref of the synchronization signal.

[0024] Further, the step S4 comprises the following steps:

[0025] S4.1: calculate the high level duration S T1 of the PWM control signal = T1xp ref , wherein T1 is the duty cycle calculated in step S3 according to the power converter control requirement;

[0026] S4.2: generate a third ramp signal with a period synchronized with the period value of the auxiliary signal and accumulated with the power converter clock, and monitor the count value of the third ramp signal;

[0027] S4.3: when the count value S of the third ramp signal is less than or equal to S TPWM , a high-level control signal is output; when the count value S of the third ramp signal is greater than S T1 , a low-level control signal is output. TPWM T1 .

[0028] The real-time synchronous control system of the power converter comprises a voltage sampling circuit, a control circuit and a synchronous circuit. The voltage sampling circuit is used to collect input voltage and output voltage of the power converter. The control circuit calculates duty cycle of the PWM control signal according to digital sampling signals output by the voltage sampling circuit and control requirements. The synchronous circuit is used to obtain period and phase of an external synchronization signal, generate a PWM control signal with the same period and phase as the synchronization signal and the same duty cycle as the duty cycle calculated by the control circuit, and the PWM control signal is used to control power switching devices of the power converter.

[0029] Further, the synchronous circuit comprises a period capture module, an auxiliary synchronization module and a synchronous control module. The period capture module is used to obtain period of the external synchronization signal. The auxiliary synchronization module is used to generate an auxiliary signal synchronized with the external synchronization signal. The synchronous control module is used to generate the PWM control signal according to the auxiliary signal and the duty cycle calculated by the control circuit.

[0030] Further, the period capture module comprises a first crystal oscillator, a first ramp generation module, a first rising edge capture module, a first latch, a first comparator and a data processing module. The first crystal oscillator is used to provide a clock signal for the first ramp generation module. The first ramp generation module is used to generate a first ramp signal accumulated with the clock signal. The same-phase input end of the first digital comparator receives a count value of the first ramp signal. The opposite-phase input end of the first comparator receives a preset period value of the first ramp signal. The output end of the first comparator outputs a set signal of the first ramp generation module. The first rising edge capture module is used to capture a rising edge of the external synchronization signal. The first latch is used to latch the count value of the first ramp signal at the rising edge of the external synchronization signal. The data processing module is used to calculate the period value of the external synchronization signal according to the count value recorded by the latch.

[0031] ​Further, the auxiliary synchronization module comprises a second crystal oscillator, a second slope generation module, a second comparator, a third comparator, a software synchronization logic module, a second rising edge capture module and a second latch, the second crystal oscillator is configured to provide a clock signal for the second slope generation module, the second slope generation module is configured to accumulate a second slope signal with the clock signal, the non-inverting input terminal of the second comparator is configured to receive a preset duty cycle of an auxiliary signal, the inverting input terminal of the second comparator is configured to receive a count value of the second slope signal, the output terminal of the second comparator is configured to output the auxiliary signal, the non-inverting input terminal of the third comparator is configured to receive a technical value of the second slope signal, the inverting input terminal of the third comparator is configured to receive a period value of the auxiliary signal output by the software synchronization logic module, the output terminal of the third comparator is configured to output a set signal of the second slope generation module, the second rising edge capture module is configured to capture a rising edge of an external synchronization signal, the second latch is configured to latch the count value of the second slope signal at the rising edge of the external synchronization signal, and the software synchronization logic module is configured to adjust the period value of the auxiliary signal according to the count value latched by the second latch, the period of the auxiliary signal output last time and the period value of the synchronization signal obtained by the synchronization circuit, so that the auxiliary signal is synchronized with the synchronization signal.

[0032] Further, the synchronization control module comprises a third crystal oscillator, a third slope generation module, a fourth comparator and a duty cycle calculation module, the third crystal oscillator is configured to provide a clock signal for the third slope generation module, the third slope generation module is configured to accumulate a third slope signal with the clock signal, the rising edge of the auxiliary signal controls the setting of the third slope generation module, the duty cycle calculation module is configured to calculate the high level duration of the output PWM control signal according to the duty cycle calculated by the control circuit, the non-inverting input terminal of the fourth comparator is configured to receive the high level duration of the PWM control signal, the inverting input terminal of the fourth comparator is configured to receive a count value of the third slope signal, and the output terminal of the fourth comparator is configured to output the PWM control signal.

[0033] The module power supply of the application comprises the real-time synchronization control system of the power converter.

[0034] Beneficial effects: Compared with the prior art, the present application has the following advantages: by applying an external synchronization signal to all module power supplies, then each module power supply acquires the period and phase of the synchronization signal according to the respective clock, and generates a PWM signal with the same period and phase as the synchronization signal to control the power switch device of the power converter in the module power supply, the synchronization between the power supplies in the module power supply parallel system is realized, thereby avoiding the formation of circulating current between the module power supplies, reducing the loss and avoiding damage to the load. At the same time, through the steps of period acquisition, edge detection and closed-loop regulation, the period and phase of the PWM signal are gradually synchronized with the external input synchronization signal, which can adapt to the harsh scene of large fluctuations and changes of the external synchronization signal, avoid the sudden change of the working frequency of the converter due to the sudden change of the frequency of the synchronization signal, and avoid the failure of the converter due to the loss of duty ratio or through abnormal working conditions, thereby improving the reliability of the synchronization control. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 FIG. 1 is a schematic diagram of a real-time synchronization control system of a power converter according to an embodiment of the present application.

[0036] Figure 2 FIG. 4 is a principle block diagram of a synchronization circuit according to an embodiment of the present application.

[0037] Figure 3 FIG. 6 is a principle block diagram of a period capture module according to an embodiment of the present application.

[0038] Figure 4 FIG. 7 is a working waveform diagram of the period capture module according to an embodiment of the present application.

[0039] Figure 5 FIG. 9 is a principle block diagram of an auxiliary synchronization module according to an embodiment of the present application.

[0040] Figure 6 FIG. 11 is a principle block diagram of a software synchronization logic module according to an embodiment of the present application. Figure 5 FIG. 12 is a principle block diagram of a middle edge capture according to an embodiment of the present application.

[0041] Figure 7 FIG. 14 is a working flowchart of the software synchronization logic module according to an embodiment of the present application.

[0042] Figure 8 FIG. 15 is a working waveform diagram of the auxiliary synchronization module according to an embodiment of the present application.

[0043] Figure 9 FIG. 17 is a principle block diagram of a synchronization control module according to an embodiment of the present application. DETAILED DESCRIPTION

[0044] The technical solutions of the present application will be further described below in combination with the drawings.

[0045] The real-time synchronization control method of the power converter according to the embodiment of the present application comprises the following steps:

[0046] S1: inputting an external synchronization signal with a period and a phase which can be changed in real time, and distributing the synchronization signal to each power converter;

[0047] S2: each power converter acquires the period and the phase of the synchronization signal under its own clock;

[0048] S3: each power converter calculates the duty cycle of each power converter according to its own control requirement;

[0049] S4: each power converter generates a PWM control signal with a high level time being the product of the calculated duty cycle and the period, and the period and the phase being the same as the synchronization signal, to control the power switching device of the power converter.

[0050] According to the above control method, the power converters in different module power supplies can be controlled to be synchronized by applying an external control signal, so that the multiple module power supplies can be synchronized, the current loop between the modules can be avoided, the loop current can be formed, the power supply system can be disturbed, the normal work of the components and devices can be affected, unnecessary loss can be generated, the efficiency can be affected, and the load can be greatly impacted. Meanwhile, by acquiring the period and the phase of the external synchronization signal, the PWM signal which is real-time synchronized with the external synchronization signal can be generated, the harsh scene with large fluctuation and change of the synchronization signal can be adapted, the abnormal working conditions such as loss of duty cycle or through of the converter caused by sudden change of the frequency of the synchronization signal can be avoided, and the reliability of the synchronization control can be improved. It can be understood that the period can be acquired by timing method or frequency counting method, and the phase can be acquired by impedance method, difference method or voltage method.

[0051] Referring to Figure 1 According to the real-time synchronization control system of the power converter, the voltage sampling circuit 200 is used to collect the input voltage and the output voltage of the power converter, the control circuit 300 is used to calculate the duty cycle of the power converter according to the signal output by the voltage sampling circuit 200 and according to the control requirement, and the synchronization circuit 400 is used to acquire the period and the phase of the external synchronization signal, to generate the PWM signal with the same period and phase as the synchronization signal and with the same duty cycle as the duty cycle calculated by the control circuit 300, to apply the generated PWM signal to the power switching device of the power converter, to realize the synchronization of the switching frequency, the turn-on time and the phase of the power converter in different module power supplies, to realize the synchronization between the multiple module power supplies in the module power supply parallel system, and to avoid the loop current between the module power supplies.

[0052] Referring to Figure 1In the embodiment, the technical solution of the embodiment is described by taking a Buck converter as an example. It should be noted that the carrier synchronization method and circuit of the embodiment are also applicable to other conversion circuits with synchronization requirements.

[0053] The Buck converter 100 is composed of an input voltage source v in , a switching tube Q1, a diode D2, a filter inductor L f , a filter capacitor C f , an output load R Ld , and the like. The switching tube Q1 further includes a parasitic diode D1 and a parasitic capacitor C1. A digital control system composed of a voltage sampling circuit 200, a control circuit 300, and a synchronization circuit 400 realizes closed-loop control of the output voltage of the Buck converter 100 by outputting a switching tube driving signal v PWM .

[0054] The voltage sampling circuit 200 converts the input and output voltages v in and v o of the Buck converter 100 into small signals v ins and v os convenient for the digital controller to process. The control circuit 300 controls the output voltage of the Buck converter 100 to reach the expected value by a proportional-integral control method, and the calculation formula is as follows:

[0055]

[0056] In the formula, k p and k i are the proportional and integral coefficients, respectively, which are usually determined according to the operating conditions of the main power circuit; v oref is the output voltage reference of the converter; and the control circuit 300 outputs a control signal T1 representing the duty cycle according to the result calculated by formula (1), which is determined by the following formula:

[0057] T1=v ins ×v er (2)

[0058] Referring to Figure 2 , the synchronization circuit 400 includes a period capture module 410, an auxiliary synchronization module 420, and a synchronization control module 430. The period capture module 410 is used to obtain the period of an external synchronization signal, the auxiliary synchronization module 420 is used to generate an auxiliary signal of the external synchronization signal, and the synchronization control module 430 is used to generate a PWM signal according to the auxiliary signal and the duty cycle calculated by the control circuit 300.

[0059] Referring to Figure 3The period capture module 410 includes a first crystal oscillator 411, a first ramp generation module 412, a first rising edge capture module 413, a first latch 414, a first comparator 415, and a data processing module 416. The first crystal oscillator 411 provides a clock signal to the first ramp generation module 412, which generates a period P that accumulates with the clock. cnt The first ramp signal S cnt ,like Figure 4 As shown, when the first slope generation module 412 generates the first slope signal S cnt The count value reaches P cnt At that time, the first comparator 415 outputs a high-level set signal T. Rst Reset the first ramp generation module 412. Each time the external synchronization signal s... yn When the rising edge arrives, the first rising edge capture module 413 controls the count value C of the first digital ramp signal stored in the first latch 414. nt The same P cnt The difference between the count values ​​of adjacent rising edges during the period is the synchronization signal s. yn The period. To improve the accuracy of the obtained period, the average of multiple calculated periods can be taken as the final period value p. ref . Reference Figure 4 In this embodiment, the average of the period values ​​of four consecutive captures is taken as the external synchronization signal s. yn periodic value p ref As shown in the following formula:

[0060]

[0061] P cnt The value needs to be at least 5 times the period value of the external synchronization signal, preferably 10 times.

[0062] Reference Figure 5 and Figure 6 The auxiliary synchronization module 420 includes a second crystal oscillator 421, a second ramp generation module 422, a second comparator 423, a third comparator 424, a software synchronization logic module 425, a second rising edge capture module 426, and a second latch 427. The second crystal oscillator 421 provides a clock signal to the second ramp generation module 422, and the second ramp generation module 422 generates a second ramp signal T. mid When the count value of the second ramp signal is less than the preset duty cycle value D... mid When the signal is low, the second comparator 423 outputs a low level; otherwise, it toggles to a high level, forming the auxiliary signal s. mid The second rising edge capture module 426 captures the synchronization signal s. ynThe rising edge of the signal controls the second latch 427 to latch the count value of the second ramp signal, denoted as C. sync The software synchronization logic module 425 synchronizes the previous auxiliary signal s. mid period p mid Periodic value p ref and count value C sync Adjustment period p mid period p mid The initial value is preset, which ultimately makes the auxiliary signal s mid external synchronization signal s yn synchronous.

[0063] Reference Figure 7 The software synchronization logic module 425 adjusts the auxiliary signal s according to the following method. mid periodic value p mid :

[0064] S2.51: Calculate the period value p of the synchronization signal. ref The period value p of the auxiliary signal after the last adjustment mid The difference d tp The absolute value of |d tp | Greater than the set threshold d th If |d tp | Less than or equal to the set threshold d th If so, proceed to step S2.53;

[0065] S2.52: If d tp If d is positive, then the period of the auxiliary signal is increased by a first gradient value; if d tp If the value is negative, then the period of the auxiliary signal is reduced by one first gradient value; that is, d tp When d is positive, Δp1 is positive; tp When the value is negative, △p1 is negative.

[0066] S2.53: Capture the rising edge of the synchronization signal and record the count value C of the second ramp signal corresponding to the rising edge moment. sync ;

[0067] S2.54: When C 1t ≤C sync ≤C 2t And C sync >C 3t At that time, decrease the period value p of the auxiliary signal. mid A second gradient value Δp2; when C 1t ≤C sync ≤C 2t And C sync ≤C 3tWhen the period value p of the auxiliary signal is increased mid a second gradient value Δp2;

[0068] S2.55: repeat steps S2.51 to S2.54 until C sync <C 1t or C sync >C 2t ;

[0069] wherein C 1t , C 2t and C 3t are constant values set according to the period value p ref of the acquired synchronization signal.

[0070] In practice, usually C 1t = 2% p ref , C 2t = 98% p ref , C 3t = 50% p ref , that is, the phase difference between the auxiliary signal and the synchronization signal is considered to be within ±2% when they are considered to be synchronized. Through the above method, after multiple period cycles, the auxiliary signal will eventually be synchronized with the external synchronization signal, as shown in Figure 8 The gradual synchronization of the auxiliary signal and the synchronization signal through the above edge detection combined with closed-loop adjustment can avoid the dramatic change of the converter's own working frequency caused by the dramatic change of the synchronization signal, further avoid the failure of the converter, and improve the reliability of the synchronization control.

[0071] Referring to Figure 9 , the synchronization control module 430 includes a third crystal oscillator 431, a third slope generation module 432, a fourth comparator 433, and a duty cycle calculation module 434. The third crystal oscillator 431 is configured to provide a clock signal for the third slope generation module 432, and the third slope generation module 432 is configured to generate a third slope signal S Tpwm When the rising edge of the auxiliary signal s mid arrives, the third slope generation module 432 is reset. The duty cycle calculation module 434 calculates the high-level duration of the output PWM signal through the following formula:

[0072] S T1 = T1×p ref (4)

[0073] When the count value of the third slope signal S Tpwm is greater than S T1 , the fourth comparator 433 outputs a low level, otherwise it is flipped to a high level, forming a v PWM signal S pwmThe signal is applied to the transistor Q1 of the Buck converter 100, so that the frequency of the Buck converter 100 is synchronized with the synchronization signal, and the synchronization between the parallel multiple module power supplies is realized. According to the module power supply of the embodiment of the application, the synchronization control can be realized by applying the external synchronization signal, the circulating current between the modules is avoided, the safety of the load is protected, and the consumption is reduced.

Claims

1. A real-time synchronization control method for a power converter, characterized in that, Includes the following steps: S1. An externally input synchronization signal with a period and phase that can change in real time is provided and distributed to each power converter. S2. Each power converter acquires the period and phase of the synchronization signal under its own clock, including the following steps: S221. Calculate the absolute value of the difference between the period value of the synchronization signal and the period value of the previously adjusted auxiliary signal. If the absolute value of the difference is greater than the set threshold, proceed to step S222; if the absolute value of the difference is less than or equal to the set threshold, proceed to step S223. S222. If the difference in period values ​​is positive, then increase the period value of the auxiliary signal by one first gradient value; if the difference in period values ​​is negative, then decrease the period value of the auxiliary signal by one first gradient value. S223. Capture the rising edge of the synchronization signal and record the count value C of the second ramp signal corresponding to the rising edge moment. sync ; S224, when C 1t ≤C sync ≤C 2t And C sync >C 3t When C decreases the period of the auxiliary signal by a second gradient value; 1t ≤C sync ≤C 2t And C sync ≤C 3t At that time, the period value of the auxiliary signal is increased by a second gradient value; S225. Repeat steps S221-S224 until C. sync <C 1t Or C sync >C 2t ; Among them, C 1t C 2t and C 3t This is a set value set based on the acquired synchronization signal period value; S3. Each power converter calculates its duty cycle according to its own control requirements; S4. The high-level time generated by each power converter is the product of the calculated duty cycle and the period. The PWM control signal with the same period and phase as the synchronization signal controls the power switching devices of the power converter.

2. The real-time synchronization control method for a power converter according to claim 1, characterized in that, S2 includes the following steps: S2.1, Generate a period of P cnt And the first ramp signal S accumulated with the first crystal oscillator clock cnt The period value P of the first ramp signal cnt It must be at least 5 times the maximum period of the externally input synchronization signal; S2.

2. Capture the rising edge of the synchronization signal and record the count value of the first ramp signal at the rising edge of the synchronization signal. The difference between the count values ​​of the first ramp signal corresponding to adjacent rising edges is the period monitoring value of the synchronization signal. S2.3 Calculate the average of several consecutive periodic monitoring values ​​as the periodic value p of the synchronization signal. ref ; S2.4 Generate another second ramp signal that accumulates with the second crystal oscillator clock, and an auxiliary signal with an initial value of set duty cycle and period length. The period of the second ramp signal is consistent with that of the auxiliary signal. S2.

5. Capture the rising edge of the synchronization signal, record the count value of the second ramp signal at the rising edge of the synchronization signal, and adjust the period length of the auxiliary signal until the count value of the second ramp signal at the rising edge of the synchronization signal is within the set threshold range.

3. The real-time synchronization control method for a power converter according to claim 1, characterized in that, S4 includes the following steps: S4.1 Calculate the high-level duration S of the PWM control signal. T1 =T1×p ref Where T1 is the duty cycle calculated in step S3 based on the control requirements of the power converter; S4.2 Generate a third ramp signal whose period is synchronized with the period value of the auxiliary signal and accumulates with the power converter clock, and monitor the count value of the third ramp signal. S4.3, When the count value S of the third ramp signal TPWM Less than or equal to S T1 When the count value S of the third ramp signal is reached, a high-level control signal is output; when the count value S of the third ramp signal is reached... TPWM Greater than S T1 When this occurs, a low-level control signal is output.

4. A real-time synchronous control system for a power converter, characterized in that, The system includes a voltage sampling circuit, a control circuit, and a synchronization circuit. The voltage sampling circuit is used to acquire the input and output voltages of the power converter. The control circuit calculates the duty cycle of the output PWM control signal based on the digital sampling signal output by the voltage sampling circuit and the control requirements. The synchronization circuit is used to acquire the period and phase of an external synchronization signal and generate a PWM control signal with the same period and phase as the synchronization signal and the same duty cycle as the duty cycle calculated by the control circuit. The PWM control signal is used to control the power switching devices of the power converter. The synchronization circuit includes a period capture module, an auxiliary synchronization module, and a synchronization control module. The period capture module is used to acquire the period of the external synchronization signal. The auxiliary synchronization module is used to generate an auxiliary signal synchronized with the external synchronization signal. The synchronization control module is used to generate the PWM control signal based on the auxiliary signal and the duty cycle calculated by the control circuit.

5. The real-time synchronization control system for the power converter according to claim 4, characterized in that, The period capture module includes a first crystal oscillator, a first ramp generation module, a first rising edge capture module, a first latch, a first comparator, and a data processing module. The first crystal oscillator provides a clock signal to the first ramp generation module. The first ramp generation module generates a first ramp signal that accumulates with the clock signal. The non-inverting input of the first comparator receives the count value of the first ramp signal, and the inverting input of the first comparator receives a preset period value of the first ramp signal. The output of the first comparator outputs a set signal for the first ramp generation module. The first rising edge capture module captures the rising edge of an external synchronization signal. The first latch latches the count value of the first ramp signal at the rising edge of the external synchronization signal. The data processing module calculates the period value of the external synchronization signal based on the count value recorded by the first latch.

6. The real-time synchronization control system for the power converter according to claim 4, characterized in that, The auxiliary synchronization module includes a second crystal oscillator, a second ramp generation module, a second comparator, a third comparator, a software synchronization logic module, a second rising edge capture module, and a second latch. The second crystal oscillator provides a clock signal to the second ramp generation module, which accumulates a second ramp signal with the clock signal. The non-inverting input of the second comparator receives a preset duty cycle of the auxiliary signal, the inverting input receives the count value of the second ramp signal, and the output of the second comparator outputs the auxiliary signal. The non-inverting input of the third comparator receives the second ramp signal. The third comparator receives the period value of the auxiliary signal output by the software synchronization logic module at its inverting input terminal. The output terminal of the third comparator outputs the set signal of the second ramp generation module. The second rising edge capture module is used to capture the rising edge of the external synchronization signal. The second latch is used to latch the count value of the second ramp signal when the external synchronization signal rises. The software synchronization logic module is used to adjust the period value of the auxiliary signal according to the count value latched by the second latch, the period of the previously output auxiliary signal, and the period value of the synchronization signal obtained by the synchronization circuit, so that the auxiliary signal is synchronized with the synchronization signal.

7. The real-time synchronization control system for the power converter according to claim 4, characterized in that, The synchronization control module includes a third crystal oscillator, a third ramp generation module, a fourth comparator, and a duty cycle calculation module. The third crystal oscillator provides a clock signal to the third ramp generation module. The third ramp generation module generates a third ramp signal that accumulates with the clock signal. The rising edge of the auxiliary signal controls the third ramp generation module to be set. The duty cycle calculation module calculates the high-level duration of the output PWM control signal based on the duty cycle calculated by the control circuit. The non-inverting input of the fourth comparator receives the high-level duration of the PWM control signal, and the inverting input receives the count value of the third ramp signal. The output of the fourth comparator outputs the PWM control signal.

8. A modular power supply, characterized in that, Including a real-time synchronous control system for a power converter according to any one of claims 4 to 7.

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