Module power supply and power supply system

Abstract

The invention relates to a module power supply and a power supply system, and the module power supply is constructed on a four-layer PCB, and comprises an input filtering module; the power conversion module comprises a primary winding with a tap and a primary main control chip; a power tube is arranged in the primary main control chip, and pulse voltage applied to the primary winding and energy transmitted to the secondary side are adjusted by controlling the on-off state of the power tube; after the power tube is turned off, the tap of the primary winding is used for extracting part of the primary winding to form an auxiliary winding to supply power to the primary main control chip; the secondary rectification and output filtering module comprises a secondary winding, a rectifier tube and a filter capacitor, and is used for rectifying and filtering the alternating current secondarily output by the transformer to generate direct current output; the feedback control module collects and processes the output voltage to generate a correction error signal and is used for feeding back the switching time of the power tube; and the auxiliary power supply module is used for rectifying, filtering and stabilizing the auxiliary power supply voltage output by the auxiliary winding so as to supply power to the primary main control chip.

Description

Technical Field

[0001] The present invention relates to the field of electronic power technology, and particularly to a modular power supply and a power supply system. Background Art

[0002] With the growth of the demand for electronic devices and the continuous upgrade of functions, the modular power supply, as the core component of power conversion, plays a crucial role in the power supply system. The modular power supply is an overall structure that integrates a variety of key power conversion devices. Its core components usually include a planar transformer, a power conversion chip integrating a primary controller and a power transistor, a synchronous rectification chip integrating a secondary synchronous rectification controller and a power transistor, output filter capacitors, and a feedback network, etc. This highly integrated design enables the modular power supply to work independently only by providing a DC input voltage without complex peripheral circuits, thus greatly shortening the product development cycle and facilitating the rapid development of power modules suitable for various application scenarios.

[0003] The modular power supply has become an important part of the power supply design field by virtue of its high integration, high power density, and ultra-thin design. The modular power supply is widely used in application scenarios such as consumer electronics, industrial control, and communication equipment. Its core design goal is to achieve efficient conversion and stable output of electric energy.

[0004] Currently, most modular power supplies are based on switching power supply technology and adopt Pulse Width Modulation (PWM) control mode to realize the transformation of the input voltage by using a high-frequency transformer. Compared with traditional linear regulated power supplies, the modular power supply not only has higher efficiency but also can better meet the requirements of miniaturization and lightweight.

[0005] However, the modular power supplies in the prior art usually adopt an independent auxiliary power supply circuit to supply power to the control chip and the drive circuit, which increases the complexity and power consumption of the circuit. In addition, the number of layers of the Printed Circuit Board (PCB) has a direct impact on the performance, reliability, manufacturing cost, and overall design of the modular power supply. Too many layers of the PCB will cause a significant increase in cost and problems in manufacturing complexity, thermal stress, and signal delay. Too few layers of the PCB will bring problems in aspects such as signal integrity and electromagnetic compatibility (EMC), power density, and integration. Summary of the Invention

[0006] The purpose of the present invention is to provide a module power supply and power supply system in view of the defects existing in the prior art. The module power supply adopts a four-layer PCB board design, and combines the tap power supply method of the primary winding to realize the power supply of the main control chip by tapping part of the primary winding to form an auxiliary winding when the power tube is turned off, successfully omitting the separate auxiliary power supply winding in the traditional design, and significantly simplifying the PCB layout and manufacturing process. Under the premise of ensuring the normal operation performance of the power module, the number of PCB layers and material usage are minimized, the power density is further improved, and the overall manufacturing cost of the module is reduced, which is more competitive in the market.

[0007] To achieve the above objectives, in a first aspect, the present invention provides a module power supply, which is constructed on a four-layer printed circuit board PCB; the module power supply comprises:

[0008] An input filter module is used to filter the input voltage and remove interference signals of the input voltage;

[0009] A power conversion module, comprising a primary winding of a planar transformer with a tap and a primary main control chip; the primary main control chip has a built-in power tube, and the primary main control chip generates a pulse width modulation PWM control signal to drive and control the switch state of the built-in power tube, thereby adjusting the pulse voltage applied to the primary winding, and further controlling the energy transmitted to the secondary side through the planar transformer; after the power tube is turned off, the tap of the primary winding is used to extract part of the primary winding to form an auxiliary winding, which is used to power the primary main control chip and the auxiliary winding of the planar transformer;

[0010] The secondary rectification and output filtering module includes the secondary winding of the planar transformer, a rectifier tube and a filter capacitor, and is used to rectify and filter the AC power outputted from the secondary of the transformer to generate a DC output;

[0011] A feedback control module, used for collecting the output voltage of the DC output, generating a correction error signal after processing the output voltage, and feeding back the correction error signal to the primary main control chip to adjust the duty cycle of the PWM control signal, thereby adjusting the switching time of the power tube;

[0012] The auxiliary power supply module is used to rectify, filter and stabilize the auxiliary power supply voltage output by the auxiliary winding to supply power to the primary main control chip.

[0013] Preferably, the primary winding is constructed on a four-layer PCB, including a main winding and the auxiliary winding; the main winding and the auxiliary winding are connected in series through the power tube to form the primary winding;

[0014] Among them, the main winding is constructed on the top layer board. Starting from the first end of the main winding, after winding the first number of turns m in the first direction, it is connected to the inner first layer board through the first via hole, and is connected to the innermost side of the winding of the primary winding through the first connecting copper foil on the first layer board, and then returns to the top layer board through the second via hole, and continues to wind the second number of turns n in the first direction to the second end of the main winding; the auxiliary winding is constructed on the bottom layer board. Starting from the first end of the auxiliary winding, after winding the third number of turns p in the first direction, it is connected to the inner second layer board through the third via hole, and is connected to the outermost side of the winding of the primary winding through the second connecting copper foil on the second layer board, and then returns to the bottom layer board through the fourth via hole, and continues to wind the fourth number of turns q in the first direction to the second end of the auxiliary winding.

[0015] Further preferably, the tap of the primary winding is the second end of the auxiliary winding.

[0016] Preferably, the secondary winding is constructed on the inner first layer board and the inner second layer board of the four-layer PCB. Starting from the first end of the secondary winding, after winding the fifth number of turns h in the first direction, it is connected to the inner second layer board through the fifth via hole, and continues to wind the sixth number of turns i in the first direction to the second end of the secondary winding.

[0017] Preferably, the input filter module includes one or more input capacitors; the multiple input capacitors are connected in parallel, and the input filter module is connected between the input voltage and the ground.

[0018] Preferably, the feedback control module includes:

[0019] A voltage sampling network for collecting the output voltage from the output end of the module power supply and performing voltage division processing to form an output voltage sampling signal;

[0020] An error amplification and compensation circuit for comparing the output voltage sampling signal with a preset reference voltage, and performing amplification and compensation processing on the comparison result to generate a corrected error signal adjusted in phase and gain;

[0021] An optocoupler feedback device for electrically isolating the corrected error signal and feeding it back to the primary main control chip.

[0022] Preferably, the module power supply further includes: an RCD absorption network for absorbing leakage inductance and protecting the power tube.

[0023] In a second aspect, an embodiment of the present invention provides a power supply system, which includes: a rectifying part, the module power supply described in the first aspect above, and an output capacitor;

[0024] The rectifying part converts the input alternating current into direct current;

[0025] The module power supply receives the direct current output by the rectifying unit, performs voltage regulation and current regulation processing, and converts it into the target voltage and / or target current required by the system.

[0026] The output capacitor is connected to the output terminal of the module power supply and is used to smooth the DC output voltage supplied to the load.

[0027] The module power supply provided by the embodiment of the present invention adopts a four-layer PCB board design and combines the tap power supply method of the primary winding, successfully omitting the separate auxiliary power supply winding in the traditional design, significantly simplifying the PCB layout and manufacturing process. On the premise of ensuring the normal operation performance of the power supply module, the number of PCB layers and the use of materials are minimized to meet the requirements for miniaturized power supply modules, further improving the power density, reducing the overall manufacturing cost of the module, and making it more competitive in the market. At the same time, the circuit layout with optimized design structure reduces electromagnetic interference and improves the reliability of the module in complex environments. The high integration and independent operation ability enable the power supply module to adapt to various application scenarios, such as DC products or AC sub-modules, etc. Brief Description of the Drawings

[0028] Figure 1 It is a structural block diagram of the module power supply provided by the embodiment of the present invention;

[0029] Figure 2a It is a circuit diagram of the module power supply provided by the embodiment of the present invention;

[0030] Figure 2b It is another circuit diagram of the module power supply provided by the embodiment of the present invention;

[0031] Figure 3a 、 3b They are respectively the front side silk screen diagram and the back side silk screen diagram of the PCB board of the module power supply provided by the embodiment of the present invention;

[0032] Figures 4a - 4d They are respectively the copper foil trace diagrams of the four-layer board of the PCB of the module power supply provided by the embodiment of the present invention;

[0033] Figure 5 It is a power supply system architecture diagram provided by the embodiment of the present invention;

[0034] Figure 6 It is another power supply system architecture diagram provided by the embodiment of the present invention. Detailed Embodiments

[0035] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments.

[0036] The embodiment of the present invention provides a module power supply built on a four-layer PCB. Figure 1This is the structural block diagram of the module power supply provided by the embodiments of the present invention. First, the technical solution of the present invention will be described in conjunction with Figure 1 , as follows.

[0037] As Figure 1 shown, the module power supply includes: an input filtering module 1, a power conversion module 2, a secondary rectification and output filtering module 3, a feedback control module 4, and an auxiliary power supply module 5.

[0038] The input filtering module 1 is used to filter the input voltage Vin, filter out the interference signals of the input voltage, mainly high-frequency interference signals, and ensure the stability of the input voltage.

[0039] Specifically, the input filtering module includes one or more input capacitors; in the case of multiple input capacitors, the multiple input capacitors are connected in parallel, and the input filtering module is connected between the input voltage and the ground.

[0040] The power conversion module 2 includes the primary winding of a planar transformer with a tap and a primary master control chip; the primary master control chip has a built-in power transistor, and the built-in power transistor serves as a high-power switching element and is directly controlled by the controller in the primary master control chip. Its main function is to drive the primary winding of the planar transformer to achieve energy conversion and transfer. The primary master control chip generates a pulse width modulation (PWM) control signal to drive and control the switching state of its built-in power transistor, thereby adjusting the pulse voltage applied to the primary winding, and further controlling the energy transferred to the secondary side through the planar transformer; after the power transistor is turned off, the tap of the primary winding is used to extract part of the primary winding to form an auxiliary winding to supply power to the primary master control chip.

[0041] In addition to the above-mentioned built-in power transistor inside the primary master control chip, an oscillator, a comparator, and a timing circuit are also integrated to generate the PWM signal. The oscillator or timer inside the chip generates a clock signal with a fixed frequency, and this signal is used to construct a periodic waveform (such as a sawtooth wave or a triangular wave).

[0042] Specifically, the controller in the primary master control chip generates a PWM signal to control the switching state of the power transistor, that is, adjusts the time ratio of its conduction and cut-off. By adjusting the duty cycle, the pulse width of the voltage applied to the primary winding can be accurately controlled, thereby modulating the energy input on the primary side of the transformer, which determines the establishment and release of the magnetic field in the transformer and directly affects the magnitude of the output voltage on the secondary side.

[0043] The secondary rectification and output filtering module 3 includes the secondary winding of the planar transformer, a rectifying diode, and a filtering capacitor, and is used to rectify and filter the alternating current output from the secondary side of the transformer to generate a direct current output.

[0044] The feedback control module 4 is used to collect the output voltage Vout of the DC output, process the output voltage to generate a correction error signal, and feedback it to the primary main control chip of the power conversion module 2 to adjust the duty cycle of the PWM control signal, thereby regulating the switching time of the power transistor.

[0045] The feedback control module 4 includes: a voltage sampling network for collecting the output voltage from the output terminal of the module power supply and performing voltage division processing to form an output voltage sampling signal; an error amplification and compensation circuit for comparing the output voltage sampling signal with a preset reference voltage, and performing amplification and compensation processing on the comparison result to generate a corrected error signal with phase and gain adjustment; an optocoupler feedback device for electrically isolating the corrected error signal and feedbacking it to the primary main control chip.

[0046] Specifically, after the feedback control module collects the output voltage, an error signal is generated through an operational amplifier and a compensation circuit. This signal reflects the deviation between the output voltage and the preset target value. Then, through optocoupler feedback, the error signal is transmitted to the primary main control chip, enabling the primary main control chip to adjust the duty cycle of its PWM signal according to the error signal, thereby regulating the switching time of the power transistor. Among them, when the output voltage is lower than the target value, the PWM signal is adjusted based on the error signal to increase the duty cycle, extending the conduction time of the power transistor, thereby increasing energy transfer and raising the output voltage. Conversely, when the output voltage is higher than the target value, the PWM duty cycle is adjusted downward, shortening the conduction time of the power transistor, reducing energy transfer, and lowering the output voltage. This adjustment mechanism can ensure the stability of the output voltage.

[0047] The auxiliary power supply module 5 rectifies, filters, and stabilizes the auxiliary power supply voltage output by the auxiliary winding to supply power to the primary main control chip.

[0048] The module power supply of the present invention further includes a resistor-capacitor-diode (RCD) absorption network for absorbing leakage inductance and protecting the power transistor in the primary main control chip of the power conversion module.

[0049] Figure 2a It is a circuit diagram of the module power supply provided by an embodiment of the present invention. Figure 2b It is another circuit diagram of the module power supply provided by an embodiment of the present invention, and they can be applicable to different application scenarios. Figure 3a 、 3b They are respectively the front side silk screen diagram and the back side silk screen diagram of the PCB board of the module power supply provided by an embodiment of the present invention. Figures 4a - 4d They are respectively the copper foil wiring diagrams of the four-layer PCB of the module power supply provided by an embodiment of the present invention. The following is based on Figure 1The structural block diagram of the provided modular power supply is used to further elaborate on the technical solution of the present invention in combination with Figures 2 - 4. The embodiments shown in Figures 2 - 4 are for making the purpose, technical solution, and advantages of the present invention clearer. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0050] According to Figure 1 And as shown in Figure 2, the input filter module 1 consists of parallel capacitors C5 and C6, which are used to filter out high - frequency interference signals at the input end and ensure the stability of the input voltage.

[0051] The power conversion module 2 includes the primary master control chip U1 on the primary side and the primary winding of the planar transformer T1. The primary winding is constructed on a four - layer PCB and includes a main winding and an auxiliary winding; the main winding and the auxiliary winding are connected in series through the power transistor in the primary master control chip U1 to form the primary winding.

[0052] The secondary rectification and output filter module 3 includes: the secondary rectifier diode U2, the output filter capacitor C14, the resistor R15, and the parallel output filter circuit C15 - C23, which are used to rectify the alternating current of the secondary winding of the transformer into direct current and filter the output to ensure the stability of the output voltage.

[0053] The feedback control module 4 includes: the output sampling voltage - dividing resistors R20 and R21 that form the voltage sampling network, the operational amplifier U4, the RC filter circuit composed of C4 and R8 that form the error amplification and compensation circuit, and the voltage divider composed of R16 and R17 used to adjust the voltage of the feedback signal, and the optocoupler U3 that forms the optocoupler feedback device. The output voltage Vout is divided by the sampling resistors R20 and R21 and sent to the operational amplifier U4 for error amplification, compared with the built - in reference voltage to generate an error signal, and the high - frequency noise is suppressed through the RC filter circuit to avoid the influence of noise interference on the normal operation of the feedback circuit, reduce the influence of high - frequency ripple during the operation of the switching power supply on the control loop, and ensure that the feedback signal is smoother. The error signal output by the operational amplifier U4 is transmitted to the feedback signal input terminal (FB) of the primary master control chip U1 through the optocoupler U3, so as to dynamically adjust the PWM duty cycle of the power transistor and stabilize the output voltage.

[0054] The auxiliary power supply module 5 is connected across the auxiliary winding. After the power tube is turned off, the auxiliary winding is flyback-powered by the secondary winding according to the output voltage. Specifically, the rectifier diode D6, resistor R7, and capacitor C10 form the auxiliary power supply circuit. After the main power is turned off, the secondary rectifier U2 conducts, D6 conducts, and the voltage across the auxiliary winding is proportional to the output voltage. The primary master control chip is powered through this circuit; Q1 is a three-terminal voltage regulator device for regulating the input voltage Vcc of the primary master control chip U1, and C3 is the power supply capacitor.

[0055] D7, R10, R12, and C12 form the RCD snubber network of the primary winding, which is connected to the power switch terminal (SW) of the primary master control chip U1 and is connected to the drain of the power tube inside the primary master control chip U1. D8, R9, R13, and C11 form the RCD snubber network of the auxiliary winding, which is connected between the two ends of the auxiliary winding and is also connected to the current sensing (CS) terminal of the primary master control chip U1 and is connected to the source of the power tube inside the primary master control chip U1. They are used to prevent high voltage spikes from occurring in the power tube, absorb the leakage inductance, and protect the power tube.

[0056] The power supply of the auxiliary power supply module of the present invention is realized by using a part of the input voltage extracted by the tap of the primary winding, and will be described in detail in combination with the PCB board structure shown in FIGS. 3 and 4.

[0057] Figure 3a The front side silk screen diagram is printed on the top layer board, and the black part in the middle area is the magnetic core of the planar transformer; Figure 3b The back side silk screen diagram is printed on the bottom layer board, and the black part in the middle area is the magnetic core of the planar transformer.

[0058] Figures 4a - 4d It is a 4-layer PCB board. The primary winding is constructed on the 4-layer PCB board, including the main winding (A - B) and the auxiliary winding (C - D). The B end of the main winding and the C end of the auxiliary winding are connected in series through the power tube, so that A - D forms the primary winding.

[0059] The main winding is constructed on the top layer board. Starting from Figure 4a It can be seen that the copper foil trace of the main winding starts from the first end B of the main winding, winds the first number of turns m (m = 0.5 in this example) in the first direction (clockwise direction in the figure), and is connected to Figure 4b the internal first layer board shown in the figure through the first via (at the B' position), and is connected to the innermost side of the winding of the main winding through the first connecting copper foil (the metal connection from B' to A' in the figure) on the first layer board, and then is connected back to the top layer board through the second via (at the A' position), and then continues to wind the second number of turns n (n = 5.5 in this example) in the first direction (clockwise direction in the figure) to the second end A of the main winding as shown in Figure 4a the figure.

[0060] The auxiliary winding is constructed on the bottom layer of the four-layer PCB, as Figure 4d shown. Please note that Figure 4d the copper foil is printed on the opposite side of the first three layers. In this description, the direction with the copper foil facing up in the first three layers is still referred to. Starting from the first end D of the auxiliary winding, winding the third number of turns p (p = 5.5 in this example) in the first direction (clockwise direction, opposite to the direction directly seen in the top view Figure 4d ), then connecting to the internal second layer through the third via (at the position of D'), as Figure 4c shown. Connect to the outermost side of the auxiliary winding through the second connecting copper foil (the metal connection from D' to C' in the figure) on the second layer, and then connect back to the bottom layer through the fourth via (at the position of C'), and continue to wind the fourth number of turns q (q = 0.5 in this example) in the first direction (clockwise direction, opposite to the direction directly seen in the top view Figure 4d ) to the second end C of the auxiliary winding.

[0061] The first end B of the main winding is connected to the drain of the power transistor, and the second end C of the auxiliary winding is connected to the source of the power transistor. Therefore, when the power transistor is turned on, the main winding and the auxiliary winding are connected in series through the power transistor.

[0062] The secondary winding is constructed on the internal first layer ( Figure 4b ) and the internal second layer ( Figure 4c ) of the four-layer PCB. Starting from the first end F of the secondary winding, winding the fifth number of turns h (h = 1 in this example) in the first direction (clockwise), then connecting to the internal second layer through the fifth via (at the position of E' in the figure), and continuing to wind the sixth number of turns i (i = 1 in this example) in the first direction (clockwise) to the second end E of the secondary winding.

[0063] After the power transistor is turned off, the auxiliary winding is powered by the secondary winding according to the output voltage flyback. The voltage magnitude at both ends of the auxiliary winding is: Vout×(p + q) / (h + i). That is, the voltage of the auxiliary winding is proportional to the voltage of the secondary winding.

[0064] With this structure, the present invention achieves an optimized PCB layout design, which can effectively reduce the impact of parasitic parameters of wires on circuit performance and improve the electrical performance of the system. By adopting a four-layer PCB board design and combining the tap power supply mode of the primary winding, it is realized that when the power tube is in the off state, part of the primary winding is extracted through the tap to form an auxiliary winding to supply power to the main control chip, successfully omitting the separate auxiliary power supply winding in the traditional design, significantly simplifying the PCB layout and manufacturing process. On the premise of ensuring the normal operation performance of the power supply module, the number of PCB layers and material usage are minimized to meet the requirements for miniaturized power supply modules, further improving the power density, reducing the overall manufacturing cost of the module, and making it more competitive in the market. At the same time, the optimized circuit layout of this design structure reduces electromagnetic interference and improves the reliability of the module in complex environments. The high integration and independent operation ability enable this power supply module to adapt to various application scenarios, such as DC products or AC sub-modules, etc. Further, in view of the electromagnetic interference (EMI) and leakage inductance problems that may occur during the high-frequency switching process, the present invention also adopts measures such as an input filter module and an RCD absorption network in the circuit design, which can significantly improve the anti-interference ability of the circuit and protect the power devices from overvoltage damage.

[0065] Figure 5 It is a power supply system architecture diagram provided by an embodiment of the present invention, corresponding to Figure 2a the application scenario of the circuit structure; Figure 6 It is another power supply system architecture diagram provided by an embodiment of the present invention, corresponding to Figure 2b the application scenario of the circuit structure. It can be seen that the modular power supply provided by the embodiment of the present invention, together with the rectifying part and the output capacitor, realizes the function of the power supply system.

[0066] The rectifying part converts the input alternating current into direct current; the modular power supply receives the direct current output by the rectifying part and performs voltage regulation and current regulation processing to convert it into the target voltage and / or target current required by the system; the output capacitor is connected to the output end of the modular power supply and is used to smooth the DC output voltage supplied to the load.

[0067] Professional personnel should also be able to further realize that, combined with the specific winding directions, number of turns, etc. described in the embodiments disclosed herein, depending on the specific application and design constraints of the technical solution, the m, n, p, q, h, i in the number of turns of winding in this embodiment can be integers or non-integers. Professional technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present invention.

[0068] The specific embodiments described above further elaborate on the object, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A module power supply, characterized in that: The module power supply is constructed on a four-layer printed circuit board PCB; the module power supply comprises: An input filter module is used to filter the input voltage and remove interference signals of the input voltage; A power conversion module, comprising a primary winding of a planar transformer with a tap and a primary main control chip; the primary main control chip has a built-in power tube, and the primary main control chip generates a pulse width modulation PWM control signal to drive and control the switch state of the built-in power tube, thereby adjusting the pulse voltage applied to the primary winding, and further controlling the energy transmitted to the secondary side through the planar transformer; after the power tube is turned off, the tap of the primary winding is used to extract part of the primary winding to form an auxiliary winding to power the primary main control chip; The secondary rectification and output filtering module includes the secondary winding of the planar transformer, a rectifier tube and a filter capacitor, and is used to rectify and filter the AC power outputted from the secondary of the transformer to generate a DC output; A feedback control module, used for collecting the output voltage of the DC output, generating a correction error signal after processing the output voltage, and feeding back the correction error signal to the primary main control chip to adjust the duty cycle of the PWM control signal, thereby adjusting the switching time of the power tube; The auxiliary power supply module is used to rectify, filter and stabilize the auxiliary power supply voltage output by the auxiliary winding to supply power to the primary main control chip.

2. The modular power supply according to claim 1, characterized in that: The primary winding is constructed on a four-layer PCB, and includes a main winding and the auxiliary winding; the main winding and the auxiliary winding are connected in series through the power tube to form the primary winding; Among them, the main winding is constructed on the top board, and starts from the first end of the main winding. After the first number of turns m is wound along the first direction, it is connected to the internal first layer board through the first via hole, and is connected to the innermost side of the winding of the primary winding through the first connecting copper foil on the first layer board, and then connected back to the top board through the second via hole, and continues to be wound along the first direction for the second number of turns n to the second end of the main winding; the auxiliary winding is constructed on the bottom board, and starts from the first end of the auxiliary winding. After the third number of turns p is wound along the first direction, it is connected to the internal second layer board through the third via hole, and is connected to the outermost side of the winding of the primary winding through the second connecting copper foil on the second layer board, and then connected back to the bottom board through the fourth via hole, and continues to be wound along the first direction for the fourth number of turns q to the second end of the auxiliary winding.

3. The modular power supply according to claim 2, characterized in that: The tap of the primary winding is the second end of the auxiliary winding.

4. The modular power supply according to claim 1, characterized in that: The secondary winding is constructed on the internal first layer board and the internal second layer board of the four-layer PCB. Starting from the first end of the secondary winding, after the fifth number of turns h is wound along the first direction, it is connected to the internal second layer board through the fifth via hole, and continues to be wound along the first direction for the sixth number of turns i to the second end of the secondary winding.

5. The modular power supply according to claim 1, characterized in that: The input filter module includes one or more input capacitors; the multiple input capacitors are connected in parallel, and the input filter module is connected between the input voltage and the ground.

6. The modular power supply according to claim 1, characterized in that: The feedback control module comprises: A voltage sampling network is used to collect the output voltage from the output end of the module power supply and perform voltage division processing to form an output voltage sampling signal; An error amplification and compensation circuit, used for comparing the output voltage sampling signal with a preset reference voltage, and amplifying and compensating the comparison result to generate a correction error signal after phase and gain adjustment; The optical coupler feedback device is used to electrically isolate the correction error signal and then feed it back to the primary main control chip.

7. The modular power supply according to claim 1, characterized in that: The module power supply also includes: an RCD absorption network, which is used to absorb leakage inductance and protect the power tube.

8. A power supply system, characterized in that: The power supply system comprises: a rectifier, a module power supply according to any one of claims 1 to 7, and an output capacitor; The rectifier converts the input AC power into DC power; The module power supply receives the direct current output by the rectifier unit and performs voltage and current stabilization processing to convert it into the target voltage and / or target current required by the system; The output capacitor is connected to the output end of the module power supply and is used to smooth the DC output voltage supplied to the load.

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