A multi-module power supply system
The main power supply module outputs the synchronization signal to the slave power supply module, and the synchronization signal technology of the time capacitor and resistor is connected in series to ensure that multiple power supply modules operate at the same frequency, solving the problem of frequency interference caused by frequency differences between modules, and improving the System stability.
Patent Information
- Application Number
- CN202310383718.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-04-12
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2043-04-12
AI Technical Summary
In a multi-module power supply system, the differential frequency interference signal caused by frequency differences between modules affects the stability of the system.
The PWM signal is outputted to the slave power module through the main power module, and the synchronization signal connected in series with the time capacitor and resistor is used to make the module work on the same frequency, ensuring that multiple power modules operate simultaneously and avoiding differential frequency interference.
It realizes that multiple power modules operate at the same frequency, improves system stability and reduces stray signal interference.
Smart Images
Figure CN116526648B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of power supply technology, in particular to a multi-module power supply system. Background Art
[0002] In high-power high-frequency switching power supply applications, in order to improve power redundancy, system reliability and maintainability, multiple power supply modules are generally used in parallel to improve system output capacity. When multiple power supply modules are working in parallel, due to the frequency difference between modules, it is easy to generate stray signals in the system, such as Figure 1 The so-called spurious signal is actually the difference frequency, that is, the frequency of the mutual interference signal formed by two signals with similar but different frequencies, and its value is the difference between the frequencies of the original two signals. Since the difference frequency interference is a low-frequency signal, it is easy to interfere with the system and affect the stability of the system. Summary of the invention
[0003] In order to solve the problem that differential frequency interference signals are easily generated during the existing multi-module power supply, thereby affecting the system stability, the present invention provides a multi-module power supply system, which enables multiple power modules to operate at the same frequency without generating differential frequency interference signals, thereby improving the system stability.
[0004] The technical solution is as follows: a multi-module power supply system, characterized in that it includes a main power supply module and a slave power supply module, the main power supply module includes an MCU module, a first PWM controller module, and a second PWM controller module, the first PWM controller module includes a power management chip IC601, the second PWM controller module includes a power management chip IC201, the slave power supply module includes the first PWM controller module and the second PWM controller module, the first PWM controller module and the second PWM controller module of the main power supply module, the first PWM controller module and the second PWM controller module of the slave power supply module are all connected to the MCU module, the main power supply module outputs a pwm signal to the slave power supply module, controls the opening or closing of the slave power supply module by controlling the duty cycle of the pwm signal, and uses the rising edge or falling edge of the pwm signal as the synchronization signal of the main power supply module and the slave power supply module, when the slave power supply module is turned on, the pwm signal is also used to control the output power size of the slave power supply module to achieve the same frequency of the main power supply module and the slave power supply module.
[0005] Its further feature is that the same frequency mode is as follows: the time capacitors of the first PWM controller module and the second PWM controller module are connected in series with a resistor and then grounded, and the input synchronization signal is superimposed on the voltage at the resistor end, so that the voltage on the time capacitor is higher than the crystal oscillator threshold voltage inside the first PWM controller module and the second PWM controller module; before the synchronization pulse appears, the first PWM controller module and the second PWM controller module operate at the set frequency; after the synchronization signal appears, the synchronization digital signal is superimposed on the original analog waveform, and the input end is the superposition of the analog and digital signals; when working, the synchronization pulse makes the voltage on the time capacitor quickly higher than the upper limit of the first PWM controller module and the second PWM controller module, the charging state of the crystal oscillator is quickly reversed, and the crystal oscillator starts a discharge cycle synchronized with the synchronization signal;
[0006] The MCU module includes a single-chip microcomputer PIC300, wherein pin 1 of the single-chip microcomputer PIC300 is connected to a 5V power supply, one end of a capacitor C304, and one end of a resistor R309, pin 3 of the single-chip microcomputer PIC300 is connected to one end of a resistor R302, one end of a resistor R303, and one end of a capacitor C301, the other end of the resistor R302 is connected to one end of a resistor R301 and a cathode of a diode CR301, the other end of the resistor R301 is connected to the first PWM controller module and the second PWM controller module, pin 4 of the single-chip microcomputer PIC300 is connected to one end of a resistor R310, the other end of the resistor R310 is connected to one end of a capacitor C253, one end of a resistor R256, the cathode of a diode CR253, and the drain end of a MOS tube Q206, and the other end of the resistor R256 Connect a 5V power supply, the anode of the diode CR253 is connected to the 7th pin of the power management chip IC201, the gate end of the MOS tube Q206 is connected to one end of the capacitor C255, one end of the resistor R313, and one end of the resistor R312, the 5th pin of the single-chip computer PIC300 is connected to one end of the capacitor C303 and one end of the resistor R308, the 6th pin of the single-chip computer PIC300 is connected to one end of the resistor R321, the other end of the resistor R309 is connected to the 2nd pin of the single-chip computer PIC300, the other end of the capacitor C301, the other end of the resistor R303, the other end of the capacitor C253, the source end of the MOS tube Q206, the other end of the capacitor C255, the other end of the resistor R313, the other end of the capacitor C303, the other end of the resistor R308, and the other end of the capacitor C304 are all grounded;
[0007] In the first PWM controller module, the 1st pin of the power management chip IC601 is connected to one end of the resistor R600, one end of the capacitor C600, one end of the capacitor C601, one end of the capacitor C602, and one end of the capacitor C603. The other end of the resistor R600 is connected to one end of the resistor R601, one end of the resistor R608, one end of the resistor R610, one end of the diode CR601 and is the VIN+ end. The other end of the resistor R601 is connected to one end of the resistor R602 and the 7th pin of the power management chip IC601. The 3rd pin of the power management chip IC601 is connected to The 9th pin of the power management chip IC601 is connected to one end of the resistor R607 and one end of the capacitor C610, the 10th pin of the power management chip IC601 is connected to one end of the capacitor C608, the 4th pin of the power management chip IC601 is connected to one end of the capacitor C604, one end of the capacitor C605, and the cathode of the diode CR603, the anode of the diode CR603 is connected to the other end of the resistor R301, and the power management chip IC60 Pin 5 of 1 is connected to one end of resistor R609, the other end of the resistor R609 is connected to one end of resistor R621 and the gate end of MOS tube Q600, the drain end of MOS tube Q600 is connected to the cathode of diode CR600 and the transformer, the anode of diode CR600 is connected to the anode of diode CR601, the source end of MOS tube Q600 is connected to one end of resistor R611, one end of resistor R612, one end of resistor R613 and the other end of resistor R621, the other end of resistor R612 and the other end of resistor R613 are connected to resistor R9 11, the other end of the capacitor C600, the other end of the capacitor C601, the other end of the capacitor C602, the other end of the capacitor C603, the other end of the capacitor C604, the other end of the capacitor C605, the other end of the capacitor C606, the other end of the resistor R603, the other end of the resistor R607, the other end of the capacitor C608, pin 6 of the power management chip IC601, pin 2 of the power management chip IC601, pin 8 of the power management chip IC601, the other end of the resistor R608, the other end of the resistor R611, the other end of the resistor R911, and the capacitor C609 are all grounded; In the second PWM controller module, the 16th and 21st pins of the power management chip IC201 are connected to one end of the resistor R228, the other end of the resistor R228 is connected to one end of the capacitor C205, one end of the resistor R229, and the other end of the resistor R301, the 24th pin of the power management chip IC201 is connected to one end of the resistor R207, one end of the capacitor C203, and one end of the resistor R206, the other end of the resistor R207 is connected to one end of the resistor R231, one end of the resistor R201 and is the VIN+ end, the other end of the resistor R231 is connected to one end of the resistor R230,The other end of the resistor R230 is connected to one end of the capacitor C202 and the 23rd pin of the power management chip IC201, the other end of the resistor R201 is connected to one end of the resistor R202, the other end of the resistor R202 is connected to one end of the resistor R203, one end of the capacitor C201, and the other end of the resistor R321, the 7th pin of the power management chip IC201 is connected to one end of the capacitor C210 and the drain end of the MOS tube Q205B, the source end of the MOS tube Q205B is connected to the 2nd pin of the microcontroller PIC300, the 8th pin of the power management chip IC201 is connected to one end of the resistor R210, the 4th pin of the power management chip IC201 is connected to one end of the capacitor C304 and one end of the resistor R211, the capacitor The other end of C304 is connected to the 7th pin of the single-chip computer PIC300, the 9th pin of the power management chip IC201 is connected to the resistor R223, the other end of the resistor R229 is connected to the 11th pin of the power management chip IC201 and one end of the capacitor C200, the 6th pin of the power management chip IC201 is connected to one end of the resistor R235, one end of the resistor R214, and one end of the capacitor C208, the other end of the resistor R235 is connected to a 5V power supply, the other end of the resistor R214 is connected to one end of the resistor R215 and one end of the resistor R216, the other end of the resistor R216 is connected to one end of the resistor R222, one end of the resistor R218, one end of the resistor R217, the source end of the MOS tube Q203A, and the MOS tube Q The gate end of the MOS tube Q203A is connected to the 14th pin of the power management chip IC201, and the drain end is connected to the drain end of the MOS tube Q203B. The gate end of the MOS tube Q203B is connected to the 13th pin of the power management chip IC201. The anode of the diode CR209 is connected to one end of the resistor R219 and the drain end of the MOS tube Q204A. The anode of the diode CR208 is connected to the drain end of the MOS tube Q204B and the other end of the resistor R219. The gate end of the MOS tube Q204A is connected to the 14th pin of the power management chip IC201. The gate end of the MOS tube Q204B is connected to the Connect to the 13th pin of the power management chip IC201, the 3rd pin of the power management chip IC201 is connected to one end of the resistor R221 and the cathode of the diode CR207, the other end of the resistor R221 is connected to the source end of the MOS tube Q205A, the gate end of the MOS tube Q205A is connected to the 2nd pin of the PIC300, the drain end of the MOS tube Q205A is connected to one end of the capacitor C206, the 5V power supply, and the 4th pin of the optical isolator U1B, the anode of the diode CR207 is connected to one end of the resistor R224, the other end of the resistor R224 is connected to one end of the capacitor C216 and the 3rd pin of the optical isolator U1B, and the 19th pin of the power management chip IC201 is connected to one end of the capacitor C212.
[0008] After adopting the present invention, the working mode of multiple power supply modules is divided into a main power supply module and multiple slave power supply modules. The main power supply module needs to send synchronization pulse signals to the slave power supply modules respectively to ensure that multiple power supply modules work at the same frequency, and no difference frequency interference signal is generated, thereby improving system stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a schematic diagram of stray signals in the existing module;
[0010] Figure 2 It is the principle diagram of the present invention;
[0011] Figure 3 It is a schematic diagram of the same frequency method;
[0012] Figure 4 It is a schematic diagram of synchronization waveform;
[0013] Figure 5 is a first PWM controller module;
[0014] Figure 6 A second PWM controller module; DETAILED DESCRIPTION
[0015] See Figure 2 As shown, a multi-module power supply system includes a master power module and a slave power module, the master power module includes an MCU module, a first PWM controller module, and a second PWM controller module, the first PWM controller module includes a power management chip IC601, the second PWM controller module includes a power management chip IC201, the slave power module includes a first PWM controller module and a second PWM controller module, the first PWM controller module and the second PWM controller module of the master power module, the first PWM controller module and the second PWM controller module of the slave power module are all connected to the MCU module, the master power module outputs a pwm signal to the slave power module, controls the on or off of the slave power module by controlling the duty cycle of the pwm signal, and uses the rising edge or falling edge of the pwm signal as a synchronization signal between the master power module and the slave power module, when the slave power module is turned on, the pwm signal is also used to control the output power of the slave power module, so as to achieve the same frequency of the master power module and the slave power module.
[0016] The frequency synchronization method is as follows: the time capacitor CT of the first PWM controller module and the second PWM controller module is not directly grounded, but connected in series with a resistor of about 25kΩ and then grounded. The input synchronization signal is superimposed on the voltage at the resistor end (the voltage at the resistor end is usually 0.5V, which is to set a small bias and can affect the initial frequency of the module), so that the voltage on the time capacitor CT is higher than the crystal threshold voltage inside the first PWM controller module and the second PWM controller module, such as Figure 3 As shown; before the synchronization pulse appears, the first PWM controller module and the second PWM controller module work at the frequency set by their own RT and CT; after the synchronization signal appears, the synchronization digital signal is superimposed on the original analog waveform, and the input end is the superposition of analog and digital signals; when working, the synchronization pulse makes the voltage on the time capacitor CT quickly higher than the upper limit of the first PWM controller module and the second PWM controller module, and the charging state of the crystal oscillator is quickly reversed, and the crystal oscillator starts the discharge cycle synchronized with the synchronization signal, as shown Figure 4 shown.
[0017] The MCU module includes a single-chip microcomputer PIC300, wherein the 1st pin of the single-chip microcomputer PIC300 is connected to a 5V power supply, one end of a capacitor C304, and one end of a resistor R309, the 3rd pin of the single-chip microcomputer PIC300 is connected to one end of a resistor R302, one end of a resistor R303, and one end of a capacitor C301, the other end of the resistor R302 is connected to one end of a resistor R301 and a cathode of a diode CR301, the other end of the resistor R301 is connected to a first PWM controller module and a second PWM controller module, the 4th pin of the single-chip microcomputer PIC300 is connected to one end of a resistor R310, the other end of the resistor R310 is connected to one end of a capacitor C253, one end of a resistor R256, the cathode of a diode CR253, and the drain end of a MOS tube Q206, and the other end of the resistor R256 is connected 5V power supply, the anode of diode CR253 is connected to pin 7 of power management chip IC201, the gate end of MOS tube Q206 is connected to one end of capacitor C255, one end of resistor R313, and one end of resistor R312, pin 5 of microcontroller PIC300 is connected to one end of capacitor C303 and one end of resistor R308, pin 6 of microcontroller PIC300 is connected to one end of resistor R321, the other end of resistor R309 is connected to pin 2 of microcontroller PIC300, the other end of capacitor C301, the other end of resistor R303, the other end of capacitor C253, the source end of MOS tube Q206, the other end of capacitor C255, the other end of resistor R313, the other end of capacitor C303, the other end of resistor R308, and the other end of capacitor C304 are all grounded.
[0018] In the first PWM controller module, the 1st pin of the power management chip IC601 is connected to one end of the resistor R600, one end of the capacitor C600, one end of the capacitor C601, one end of the capacitor C602, and one end of the capacitor C603. The other end of the resistor R600 is connected to one end of the resistor R601, one end of the resistor R608, one end of the resistor R610, one end of the diode CR601 and is the VIN+ end. The other end of the resistor R601 is connected to one end of the resistor R602 and the 7th pin of the power management chip IC601. The 3rd pin of the power management chip IC601 is connected to One end of capacitor C606 is connected to one end of capacitor C607, and the other end of capacitor C607 is connected to one end of resistor R603. Pin 9 of power management chip IC601 is connected to one end of resistor R607 and one end of capacitor C610. Pin 10 of power management chip IC601 is connected to one end of capacitor C608. Pin 4 of power management chip IC601 is connected to one end of capacitor C604, one end of capacitor C605, and the cathode of diode CR603. The anode of diode CR603 is connected to the other end of resistor R301. Pin 5 of power management chip IC601 is connected to one end of capacitor C604, one end of capacitor C605, and the cathode of diode CR603. Connect one end of resistor R609, the other end of resistor R609 is connected to one end of resistor R621 and the gate end of MOS tube Q600, the drain end of MOS tube Q600 is connected to the cathode of diode CR600 and the transformer, the anode of diode CR600 is connected to the anode of diode CR601, the source end of MOS tube Q600 is connected to one end of resistor R611, one end of resistor R612, one end of resistor R613 and the other end of resistor R621, the other end of resistor R612 and the other end of resistor R613 are connected to one end of resistor R911, capacitor C6 The other end of 00, the other end of capacitor C601, the other end of capacitor C602, the other end of capacitor C603, the other end of capacitor C604, the other end of capacitor C605, the other end of capacitor C606, the other end of resistor R603, the other end of resistor R607, the other end of capacitor C608, pin 6 of power management chip IC601, pin 2 of power management chip IC601, pin 8 of power management chip IC601, the other end of resistor R608, the other end of resistor R611, the other end of resistor R911, and capacitor C609 are all grounded; In the second PWM controller module, the 16th and 21st pins of the power management chip IC201 are connected to one end of the resistor R228, the other end of the resistor R228 is connected to one end of the capacitor C205, one end of the resistor R229, and the other end of the resistor R301, the 24th pin of the power management chip IC201 is connected to one end of the resistor R207, one end of the capacitor C203, and one end of the resistor R206, the other end of the resistor R207 is connected to one end of the resistor R231, one end of the resistor R201 and is the VIN+ end, the other end of the resistor R231 is connected to one end of the resistor R230, the other end of the resistor R230 is connected to one end of the capacitor C202 and the 23rd pin of the power management chip IC201, the other end of the resistor R201 is connected to one end of the resistor R202, the other end of the resistor R202 is connected to one end of the resistor R203, one end of the capacitor C201, and the other end of the resistor R321,Pin 7 of the power management chip IC201 is connected to one end of the capacitor C210 and the drain end of the MOS tube Q205B, the source end of the MOS tube Q205B is connected to pin 2 of the microcontroller PIC300, pin 8 of the power management chip IC201 is connected to one end of the resistor R210, pin 4 of the power management chip IC201 is connected to one end of the capacitor C304 and one end of the resistor R211, the other end of the capacitor C304 is connected to pin 7 of the microcontroller PIC300, pin 9 of the power management chip IC201 is connected to resistor R223, and the other end of the resistor R229 is connected to pin 11 of the power management chip IC201. One end of capacitor C20 and pin 6 of power management chip IC201 are connected to one end of resistor R235, one end of resistor R214, and one end of capacitor C208. The other end of resistor R235 is connected to a 5V power supply. The other end of resistor R214 is connected to one end of resistor R215 and one end of resistor R216. The other end of resistor R216 is connected to one end of resistor R222, one end of resistor R218, one end of resistor R217, the source end of MOS tube Q203A, the source end of MOS tube Q203B, the cathode of diode CR208, the cathode of diode CR209, and the gate end of MOS tube Q203A is connected to capacitor C208. The 14th pin and drain end of the power management chip IC201 are connected to the drain end of the MOS tube Q203B, the gate end of the MOS tube Q203B is connected to the 13th pin of the power management chip IC201, the anode of the diode CR209 is connected to one end of the resistor R219 and the drain end of the MOS tube Q204A, the anode of the diode CR208 is connected to the drain end of the MOS tube Q204B and the other end of the resistor R219, the gate end of the MOS tube Q204A is connected to the 14th pin of the power management chip IC201, the gate end of the MOS tube Q204B is connected to the 13th pin of the power management chip IC201, and the power management chip Pin 3 of IC201 is connected to one end of resistor R221 and the cathode of diode CR207, the other end of resistor R221 is connected to the source of MOS tube Q205A, the gate of MOS tube Q205A is connected to pin 2 of PIC300, the drain of MOS tube Q205A is connected to one end of capacitor C206, 5V power supply, and pin 4 of opto-isolator U1B, the anode of diode CR207 is connected to one end of resistor R224, the other end of resistor R224 is connected to one end of capacitor C216 and pin 3 of opto-isolator U1B, and pin 19 of power management chip IC201 is connected to one end of capacitor C212.
[0019] PIC300 is an eight-bit single-chip microcomputer. Pin 7 is the same frequency signal control terminal. When used as a master module, pin 7 (PA) of PIC300 is connected to pin 4 (RT2) of power management chip IC201 and pin 9 (RT1) of power management chip IC601 through two 100pF capacitors. At the same time, pin 7 of PIC300 is connected to the PA pin of the slave module through a PA pin.
[0020] Since the main power module is a half-brick module, the module output power is relatively large, and the external power supply range is 40-80V. Therefore, two PWM controllers are used inside the module, among which the power management chip IC201 is the auxiliary power controller inside the module. After the power supply is powered on, it first works at a frequency set by its own RT and CT to generate a 5V auxiliary power supply to power the PIC300 microcontroller and start working. The PIC300 microcontroller immediately generates a pulse signal of the same frequency, so that multiple parallel modules work at the same frequency.
[0021] When used as a slave module, there is no PIC300 microcontroller inside the module. The same frequency signal is connected to the PA pin in the module through the 4th pin of the power management chip IC201 and the power management chip IC601 using two 100pF capacitors. In this way, the master-slave module and the master and slave chips inside the module can be synchronized, meeting the requirement of no frequency difference when the modules are used in parallel. In the master-slave synchronization circuit, the PWM pulse signal frequency generated by the PIC300 microcontroller in the main power module is designed to be 300kHz±5kHz, the selection of the controller time capacitor CT and the selection of the grounding resistor when working in free oscillation before the same frequency. After a large number of experiments, it has been proved that the optimal value of the coupling capacitor of the RT pin is 100pF and the optimal value of the grounding resistor is 25kΩ.
[0022] The present invention ingeniously uses the PWM pulse signal generated by the single chip microcomputer to realize multiple modules working at the same frequency, and effectively solves the influence of the stray generated by the power modules working in parallel on the system.
Claims
1. A multi-module power supply system, It is characterized in that It includes a main power module and a slave power module, the main power module includes an MCU module, a first PWM controller module, and a second PWM controller module, the first PWM controller module includes a power management chip IC601, the second PWM controller module includes a power management chip IC201, the slave power module includes the first PWM controller module and the second PWM controller module, the first PWM controller module and the second PWM controller module of the main power module, the first PWM controller module and the second PWM controller module of the slave power module are all connected to the MCU module, the main power module outputs a pwm signal to the slave power module, controls the opening or closing of the slave power module by controlling the duty cycle of the pwm signal, and uses the rising edge or falling edge of the pwm signal as the synchronization signal of the main power module and the slave power module, when the slave power module is turned on, the pwm signal is also used to control the output power size of the slave power module, so as to achieve the same frequency of the main power module and the slave power module; The time capacitors of the first PWM controller module and the second PWM controller module are connected in series with a resistor and then grounded, and the input synchronization signal is superimposed on the voltage at the resistor end, so that the voltage on the time capacitor is higher than the crystal oscillator threshold voltage inside the first PWM controller module and the second PWM controller module; before the synchronization pulse appears, the first PWM controller module and the second PWM controller module operate at the set frequency; after the synchronization signal appears, the synchronization digital signal is superimposed on the original analog waveform, and the input end is a superposition of analog and digital signals; when working, the synchronization pulse makes the voltage on the time capacitor quickly higher than the upper limit of the first PWM controller module and the second PWM controller module, the charging status of the crystal oscillator quickly flips, and the crystal oscillator starts a discharge cycle synchronized with the synchronization signal.
2. A multi-module power supply system according to claim 1, It is characterized in that The MCU module includes a single-chip microcomputer PIC300, wherein pin 1 of the single-chip microcomputer PIC300 is connected to a 5V power supply, one end of a capacitor C304, and one end of a resistor R309, pin 3 of the single-chip microcomputer PIC300 is connected to one end of a resistor R302, one end of a resistor R303, and one end of a capacitor C301, the other end of the resistor R302 is connected to one end of a resistor R301 and a cathode of a diode CR301, the other end of the resistor R301 is connected to the first PWM controller module and the second PWM controller module, pin 4 of the single-chip microcomputer PIC300 is connected to one end of a resistor R310, the other end of the resistor R310 is connected to one end of a capacitor C253, one end of a resistor R256, the cathode of a diode CR253, and the drain end of a MOS tube Q206, and the other end of the resistor R256 A 5V power supply is connected, the anode of the diode CR253 is connected to pin 7 of the power management chip IC201, the gate end of the MOS tube Q206 is connected to one end of the capacitor C255, one end of the resistor R313, and one end of the resistor R312, the 5th pin of the single-chip microcomputer PIC300 is connected to one end of the capacitor C303 and one end of the resistor R308, the 6th pin of the single-chip microcomputer PIC300 is connected to one end of the resistor R321, the other end of the resistor R309 is connected to pin 2 of the single-chip microcomputer PIC300, and the other end of the capacitor C301, the other end of the resistor R303, the other end of the capacitor C253, the source end of the MOS tube Q206, the other end of the capacitor C255, the other end of the resistor R313, the other end of the capacitor C303, the other end of the resistor R308, and the other end of the capacitor C304 are all grounded.
3. A multi-module power supply system according to claim 2, It is characterized in that In the first PWM controller module, the 1st pin of the power management chip IC601 is connected to one end of the resistor R600, one end of the capacitor C600, one end of the capacitor C601, one end of the capacitor C602, and one end of the capacitor C603. The other end of the resistor R600 is connected to one end of the resistor R601, one end of the resistor R608, one end of the resistor R610, one end of the diode CR601 and is the VIN+ end. The other end of the resistor R601 is connected to one end of the resistor R602 and the 7th pin of the power management chip IC601. The 3rd pin of the power management chip IC601 is connected to The 9th pin of the power management chip IC601 is connected to one end of the resistor R607 and one end of the capacitor C610, the 10th pin of the power management chip IC601 is connected to one end of the capacitor C608, the 4th pin of the power management chip IC601 is connected to one end of the capacitor C604, one end of the capacitor C605, and the cathode of the diode CR603, the anode of the diode CR603 is connected to the other end of the resistor R301, and the power management chip IC60 Pin 5 of 1 is connected to one end of resistor R609, the other end of the resistor R609 is connected to one end of resistor R621 and the gate end of MOS tube Q600, the drain end of MOS tube Q600 is connected to the cathode of diode CR600 and the transformer, the anode of diode CR600 is connected to the anode of diode CR601, the source end of MOS tube Q600 is connected to one end of resistor R611, one end of resistor R612, one end of resistor R613 and the other end of resistor R621, the other end of resistor R612 and the other end of resistor R613 are connected to resistor R9 11, the other end of the capacitor C600, the other end of the capacitor C601, the other end of the capacitor C602, the other end of the capacitor C603, the other end of the capacitor C604, the other end of the capacitor C605, the other end of the capacitor C606, the other end of the resistor R603, the other end of the resistor R607, the other end of the capacitor C608, pin 6 of the power management chip IC601, pin 2 of the power management chip IC601, pin 8 of the power management chip IC601, the other end of the resistor R608, the other end of the resistor R611, the other end of the resistor R911, and the capacitor C609 are all grounded.
4. A multi-module power supply system according to claim 3, It is characterized in that In the second PWM controller module, the 16th and 21st pins of the power management chip IC201 are connected to one end of the resistor R228, the other end of the resistor R228 is connected to one end of the capacitor C205, one end of the resistor R229, and the other end of the resistor R301, the 24th pin of the power management chip IC201 is connected to one end of the resistor R207, one end of the capacitor C203, and one end of the resistor R206, the other end of the resistor R207 is connected to one end of the resistor R231, one end of the resistor R201 and is the VIN+ end, the other end of the resistor R231 is connected to one end of the resistor R230, the other end of the resistor R230 is connected to one end of the capacitor C202 and the 23rd pin of the power management chip IC201, and the other end of the resistor R201 is connected to one end of the resistor R231. The first end of the power management chip IC201 is connected to one end of the resistor R202, the other end of the resistor R202 is connected to one end of the resistor R203, one end of the capacitor C201, and the other end of the resistor R321, the 7th pin of the power management chip IC201 is connected to one end of the capacitor C210 and the drain end of the MOS tube Q205B, the source end of the MOS tube Q205B is connected to the 2nd pin of the microcontroller PIC300, the 8th pin of the power management chip IC201 is connected to one end of the resistor R210, the 4th pin of the power management chip IC201 is connected to one end of the capacitor C304 and one end of the resistor R211, the other end of the capacitor C304 is connected to the 7th pin of the microcontroller PIC300, the 9th pin of the power management chip IC201 is connected to the resistor R223, the The other end of R229 is connected to the 11th pin of the power management chip IC201 and one end of the capacitor C200. The 6th pin of the power management chip IC201 is connected to one end of the resistor R235, one end of the resistor R214, and one end of the capacitor C208. The other end of the resistor R235 is connected to a 5V power supply. The other end of the resistor R214 is connected to one end of the resistor R215 and one end of the resistor R216. The other end of the resistor R216 is connected to one end of the resistor R222, one end of the resistor R218, one end of the resistor R217, the source end of the MOS tube Q203A, the source end of the MOS tube Q203B, the cathode of the diode CR208, and the cathode of the diode CR209. The gate end of the MOS tube Q203A is connected to the power management chip The 14th pin and drain end of the chip IC201 are connected to the drain end of the MOS tube Q203B, the gate end of the MOS tube Q203B is connected to the 13th pin of the power management chip IC201, the anode of the diode CR209 is connected to one end of the resistor R219 and the drain end of the MOS tube Q204A, the anode of the diode CR208 is connected to the drain end of the MOS tube Q204B and the other end of the resistor R219, the gate end of the MOS tube Q204A is connected to the 14th pin of the power management chip IC201, the gate end of the MOS tube Q204B is connected to the 13th pin of the power management chip IC201, and the 3rd pin of the power management chip IC201 is connected to one end of the resistor R221 and the cathode of the diode CR207.The other end of the resistor R221 is connected to the source end of the MOS tube Q205A, the gate end of the MOS tube Q205A is connected to the 2nd pin of the PIC300, the drain end of the MOS tube Q205A is connected to one end of the capacitor C206, the 5V power supply, and the 4th pin of the optical isolator U1B, the anode of the diode CR207 is connected to one end of the resistor R224, the other end of the resistor R224 is connected to one end of the capacitor C216 and the 3rd pin of the optical isolator U1B, and the 19th pin of the power management chip IC201 is connected to one end of the capacitor C212.