A single transformer multi-output power supply based on resonant architecture

Abstract

The present invention provides a single-transformer multi-channel output power supply based on a resonant architecture, comprising an AC input unit connected to an electromagnetic filtering unit, a rectifier unit connected to the electromagnetic filtering unit, a boost unit connected to the rectifier unit, a capacitor filtering unit connected to the boost unit, an adjustment feedback unit connected to the capacitor filtering unit, a resonance control IC unit connected to the adjustment feedback unit, the boost unit and a resonant frame main transformer respectively, a resonant frame main transformer connected to the resonance control IC unit, at least one output rectifier module is arranged on the resonant frame main transformer side, the output rectifier module is composed of two N-type field effect transistors and a synchronous rectifier controller, and the output rectifier module outputs a corresponding voltage according to a set voltage adjustment rate and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a single-transformer multi-channel output power supply based on a resonance architecture. Background Art

[0002] The high-efficiency power supplies currently used in the market basically adopt a resonant architecture. The standby circuit generates an auxiliary voltage and gives a 5VS standby output. When the auxiliary voltage rises, the power factor circuit starts to work. When the power factor circuit works normally, the resonant circuit starts to work normally. After the rectification circuit and the filter circuit, a +12V output is obtained. After passing through a DC-DC circuit through the 12V circuit, it is converted into 3.3V. At the same time, another DC-DC circuit is required to convert it into 5V, and there is also a DC-DC circuit that converts +12V to -12V. The above-mentioned power supply type currently basically adds 2 DC-DCs or 3 DC-DCs in the realization of multi-channel output solutions, and there is also a standby circuit to provide VCC for the resonant power supply. At present, the power supply using this architecture can achieve the gold medal of 80+ efficiency certification. If it is necessary to achieve platinum efficiency or titanium efficiency, it is more difficult, and a lot of material costs need to be added to achieve efficiency improvement. Summary of the invention

[0003] The object of the present invention is to provide a single-transformer multi-output power supply based on a resonant architecture.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A single-transformer multi-output power supply based on a resonant architecture, comprising

[0006] An AC input unit connected to the electromagnetic filtering unit, the AC input unit is used to input 85-300 V AC power, and the electromagnetic filtering unit is used to filter the input 85-300 V AC power;

[0007] A rectifier unit is connected to the electromagnetic filter unit, and is used to convert the AC power filtered by the electromagnetic filter unit into DC power.

[0008] The boost unit is connected to the rectifier unit, and the boost unit uses the PFC line unit to boost the DC power converted by the rectifier unit according to a set threshold value.

[0009] A capacitor filter unit is connected to the boost unit, and the capacitor filter unit outputs a capacitor through capacitor filtering.

[0010] Stable direct current,

[0011] The feedback unit is adjusted and connected to the capacitor filter unit to collect the high-voltage filter capacitor voltage of the capacitor filter unit and feed it back to the resonance control IC unit.

[0012] The resonance control IC unit is connected to the adjustment feedback unit, the boost unit and the resonant frame main transformer respectively. The resonance control IC unit is used to receive the high-voltage filter capacitor voltage collected by the adjustment feedback unit, and the received high-voltage filter capacitor voltage is used for controlling the boost unit to provide rectangular wave drive PFC line MOS operation and resonant MOS operation.

[0013] The resonant frame main transformer is connected to the resonant control IC unit. The resonant frame main transformer converts the high-voltage rectangular wave voltage into a low-voltage rectangular wave voltage by adjusting the number of turns and the turn ratio of the winding.

[0014] At least one output rectifier module is provided on the main transformer side of the resonant frame. The output rectifier module is composed of two N-type field effect transistors and a synchronous rectifier controller. The output rectifier module outputs the corresponding voltage according to the set voltage regulation rate and efficiency.

[0015] The output filter module is connected to the output rectifier module. The output filter module is composed of a low-voltage filter capacitor and is used to absorb the ripple current of the output rectifier module.

[0016] The output control module is connected to the output filter module. The output control module samples the output voltage through the voltage divider resistor to adjust the N-type field effect tube so that the output voltage meets the specification requirements.

[0017] The protection unit is connected to the output control module, and is used to provide undervoltage, overvoltage, overcurrent, and overtemperature protection.

[0018] Preferably, the resonance control IC unit includes a PFC controller and a resonance controller, the PFC controller is connected to the boost unit, and the resonance controller is connected to the resonance frame main transformer.

[0019] Preferably, the winding of the resonant frame main transformer includes a primary winding and a secondary winding, and rectangular wave energy is provided to the primary winding through an N-type field effect transistor, and the secondary transformer winding outputs rectangular wave energy after being coupled to the energy through a magnetic field.

[0020] Preferably, the output rectifier module includes a first output rectifier unit and a second output rectifier unit.

[0021] Preferably, the output filtering module includes a first output filtering unit and a second output filtering unit.

[0022] Preferably, the output control module includes a +12V output control unit and a +5V output control unit, the first output rectifier unit is connected to the first output filter unit, the first output filter unit is connected to the +12V output control unit, the second output rectifier unit is connected to the second output filter unit, the second output filter unit is connected to the +5V output control unit, the +12V output control unit and the +5V output control unit are respectively connected to the +12V / 5V feedback unit, the +12V / 5V feedback unit is interconnected with the 5VS feedback unit and connected to the resonance control IC unit, the 5VS feedback unit is connected to the resonance control IC unit, the +5V output control unit is connected to the +3.3VDC-DC unit, the +3.3VDC-DC unit is connected to the +3.3V output unit, the +3.3V output unit is connected to the protection unit, the +12V output control unit and the +5V output control unit are respectively interconnected with the protection unit, the second output filter unit is connected to the 5VS feedback unit, and the 5VS feedback unit is connected to the +5VS output control unit.

[0023] Preferably, the +12V / 5V feedback unit is used for sampling the 12V output and 5V output voltages simultaneously with the sampling resistor when the value of the switch signal input is lower than the set threshold value, and feeding them to the feedback terminal, and feeding them back to the primary resonant controller through the first three-terminal adjustable reference source and the optocoupler to adjust the output voltage. When the voltages of 12V and 5V are too high, the first three-terminal adjustable reference source will pull down the negative end of the optocoupler diode, turning on the optocoupler, and turning on the optocoupler three-stage tube ends at the same time, and the resonant controller reduces the duty cycle of the N-type field effect tube, or increases the output frequency to adjust the output voltage.

[0024] Preferably, the 5VS feedback unit is used to put the power supply in standby mode when the value of the switch signal input is higher than a set threshold value. The 5VS feedback unit is composed of a second three-terminal adjustable reference source and a +12V / 5V feedback unit sharing an optocoupler to adjust the 5VS standby voltage. The second three-terminal adjustable reference source samples the 5VS standby voltage. When the output voltage is too high, the second three-terminal adjustable reference source pulls down the negative terminal voltage of the optocoupler diode to turn on the optocoupler, and the optocoupler transistor terminals are turned on at the same time, allowing the resonant controller to reduce the duty cycle of the N-type field effect tube, or increase the output frequency to adjust the output voltage.

[0025] Preferably, the first output rectification unit is composed of two first N-type field effect transistors and a first synchronous rectification controller, the drain of the first N-type field effect transistor is connected to the secondary winding, the source is connected to the output ground, and the gate is connected to the first synchronous rectification controller. When it is detected that the current flowing through the body diode of the first N-type field effect transistor reaches a threshold value set by the first synchronous rectification controller, the first synchronous rectification controller gives a driving voltage to turn on the first N-type field effect transistor to achieve the purpose of rectification;

[0026] The second output rectification unit is composed of two second N-type field effect transistors and a second synchronous rectification controller. The drain of the second N-type field effect transistor is connected to the secondary winding, the source is connected to the output ground, and the gate is connected to the second synchronous rectification controller. When it is detected that the current flowing through the body diode of the second N-type field effect transistor reaches the threshold set by the second synchronous rectification controller, the second synchronous rectification controller provides a driving voltage to turn on the second N-type field effect transistor to achieve the purpose of rectification.

[0027] Preferably, the +12V output control unit samples the 12V output voltage by a voltage-dividing resistor, adjusts the first N-type field effect tube, and makes the output voltage fully load specification requirements. When working under extreme load conditions, the source of the first N-type field effect tube is connected to the 12V output terminal, the drain is connected to the power output after rectification and filtering, and the gate is connected to the first three-terminal adjustable reference source control electrode. When the first three-terminal adjustable reference source detects that the 12V voltage is too high, the first three-terminal adjustable reference source pulls the gate voltage of the first N-type field effect tube low, so that the first N-type field effect tube works in an amplified state, thereby reducing the output voltage and meeting the use requirements;

[0028] The +5V output control unit samples the 5V output voltage by a voltage-dividing resistor and adjusts the second N-type field effect tube to make the output voltage fully loaded with specification requirements. When working under extreme load conditions, the source of the first N-type field effect tube is connected to the 5V output terminal, the drain is connected to the power supply output after rectification and filtering, and the gate is connected to the second three-terminal adjustable reference source control electrode. When the first three-terminal adjustable reference source detects that the 12V voltage is too high, the second three-terminal adjustable reference source lowers the gate voltage of the second N-type field effect tube, so that the second N-type field effect tube works in an amplified state, thereby reducing the output voltage and meeting the use requirements.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The output voltage of PC power supply is as follows +12V, +5V, +3.3V, 5VS, -12V. The switching LLC resonant line switching power supply transformer does not output 5V and 12V at the same time. Instead, it uses the transformer to output 12V and the DC-DC to output 5V. The rectification efficiency can reach more than 99% directly after using the transformer output. The DC-DC conversion from 12V to 5V is 95%, so the efficiency of using DC-DC to output 5V is 99%*95%=94.05%. Therefore, in terms of efficiency, the efficiency of 5V output from the transformer is improved by 5%. At the same time, the standby part of this power supply is directly converted from 5VS, so the original 85% of 5VS has been increased to the current 99%, and the efficiency of 5VS has been increased by 14%. Based on the above principle, the efficiency is improved, the use of materials is reduced, the material cost is reduced, the internal space of the power supply is saved, and the power density of the power supply is improved, so the platinum efficiency can be achieved at a lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is the framework principle diagram of the present invention;

[0032] Figure 2 The control principle diagram of the resonant frame main transformer of the present invention;

[0033] Figure 3-Figure 5 It is a working principle diagram of the present invention in different states;

[0034] Figure 6-Figure 7 This is the design principle diagram of the resonant frame main transformer of the present invention. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] See also Figures 1 to 7 , the present invention provides a technical solution:

[0037] A single-transformer multi-output power supply based on a resonant architecture, comprising

[0038] An AC input unit connected to the electromagnetic filtering unit, the AC input unit is used to input 85-300 V AC power, and the electromagnetic filtering unit is used to filter the input 85-300 V AC power;

[0039] A rectifier unit is connected to the electromagnetic filter unit, and is used to convert the AC power filtered by the electromagnetic filter unit into DC power.

[0040] The boost unit is connected to the rectifier unit, and the boost unit uses the PFC line unit to boost the DC power converted by the rectifier unit according to a set threshold value.

[0041] A capacitor filter unit is connected to the boost unit, and the capacitor filter unit outputs a capacitor through capacitor filtering.

[0042] Stable direct current,

[0043] The feedback unit is adjusted and connected to the capacitor filter unit to collect the high-voltage filter capacitor voltage of the capacitor filter unit and feed it back to the resonance control IC unit.

[0044] The resonance control IC unit is connected to the adjustment feedback unit, the boost unit and the resonant frame main transformer respectively. The resonance control IC unit is used to receive the high-voltage filter capacitor voltage collected by the adjustment feedback unit, and the received high-voltage filter capacitor voltage is used for controlling the boost unit to provide rectangular wave drive PFC line MOS operation and resonant MOS operation.

[0045] The resonant frame main transformer is connected to the resonant control IC unit. The resonant frame main transformer converts the high-voltage rectangular wave voltage into a low-voltage rectangular wave voltage by adjusting the number of turns and the turn ratio of the winding.

[0046] At least one output rectifier module is provided on the main transformer side of the resonant frame. The output rectifier module is composed of two N-type field effect transistors and a synchronous rectifier controller. The output rectifier module outputs the corresponding voltage according to the set voltage regulation rate and efficiency.

[0047] The output filter module is connected to the output rectifier module. The output filter module is composed of a low-voltage filter capacitor and is used to absorb the ripple current of the output rectifier module.

[0048] The output control module is connected to the output filter module. The output control module samples the output voltage through the voltage divider resistor to adjust the N-type field effect tube so that the output voltage meets the specification requirements.

[0049] The protection unit is connected to the output control module, and is used to provide undervoltage, overvoltage, overcurrent, and overtemperature protection.

[0050] In the above, the resonance control IC unit includes a PFC controller and a resonance controller, the PFC controller is connected to the boost unit, and the resonance controller is connected to the resonance frame main transformer.

[0051] In the above, the winding of the resonant frame main transformer includes a primary winding and a secondary winding. The primary winding is provided with rectangular wave energy through an N-type field effect transistor, and the secondary winding outputs rectangular wave energy after coupling to the energy through a magnetic field. For +12V output, the turns ratio of the primary winding and the secondary winding is 12 / 1-17 / 1. In this power supply design, in order to meet the output voltage regulation rate and efficiency, the winding ratio of the two sets of output voltages of the secondary winding is optimized. Because the output voltages of +12V and +5V are output from the transformer, the optimal ratio of the secondary windings of +12V and +5V is 12 / 5. Referring to the least common multiple, the output windings +5V and +12V should be 5 turns and 12 turns. Combined with the actual situation, due to too many turns, the transformer size is limited. The system results in smaller wire diameters of the primary winding and the secondary transformer winding, large copper wire loss of the transformer, and low efficiency, so it needs to be readjusted. The 12V secondary winding is now reduced to meet the efficiency and transformer window turns. Experiments have found that the +12V secondary winding takes 3.5 turns, and the +5V secondary winding takes 1.5 turns that can be wound. The turn ratio is 2.3333 (close to the optimal turns ratio of 2.4). The 12V / 5V turn ratio is 2.333 to make an actual prototype. The interleaving adjustment rate can meet the 5% requirement, and the transformer efficiency can be above 99%. It can currently meet the 80+ efficiency standard gold and platinum transformer design requirements. Therefore, a multi-channel output resonant power supply is advocated, and the transformer 12V / 5V secondary turn ratio is 3.5 turns / 1.5 turns.

[0052] Reference Figure 6 and Figure 7 , add two secondary windings of the transformer to output 5V in one group and 12V in the other. Considering the high efficiency requirements of the transformer, it is necessary to control the ratio of the secondary windings. Since 12 / 5 is 2.4, the transformer should be an integer or half a turn. +12V takes 3.5 turns (to improve efficiency, the fewer the better, but the 5V winding needs 3.5 turns) +5V takes 1.5 turns, and the ratio of +12V to +5V is 2.33, which is close to 2.4. Considering that 12V windings are more and the coupling is better, the voltage will be higher, so the 2.33 ratio is a better transformer winding method. Considering that if a diode rectifier is used, our transformer can adopt a full-stack architecture. At this time, the transformer can output 3.3V, 5V, and 12V. The transformer turns ratio is 1 / 1.5 / 3.5. This is a low-cost silver medal efficiency series.

[0053] In the above, the output rectifier module includes a first output rectifier unit and a second output rectifier unit.

[0054] In the above, the output filtering module includes a first output filtering unit and a second output filtering unit.

[0055] In the above, the output control module includes a +12V output control unit and a +5V output control unit, the first output rectifier unit is connected to the first output filter unit, the first output filter unit is connected to the +12V output control unit, the second output rectifier unit is connected to the second output filter unit, the second output filter unit is connected to the +5V output control unit, the +12V output control unit and the +5V output control unit are respectively connected to the +12V / 5V feedback unit, the +12V / 5V feedback unit is interconnected with the 5VS feedback unit, and is connected to the resonance control IC unit, the 5VS feedback unit is connected to the resonance control IC unit, the +5V output control unit is connected to the +3.3VDC-DC unit, the +3.3VDC-DC unit is connected to the +3.3V output unit, the +3.3V output unit is connected to the protection unit, the +12V output control unit and the +5V output control unit are respectively interconnected with the protection unit, the second output filter unit is connected to the 5VS feedback unit, and the 5VS feedback unit is connected to the +5VS output control unit.

[0056] In the above, the +12V / 5V feedback unit is used to sample the 12V output and 5V output voltages simultaneously through the sampling resistor when the value of the switch signal input is lower than the set threshold value, and give them to the feedback terminal, and feed them back to the primary resonant controller through the first three-terminal adjustable reference source and the optocoupler to adjust the output voltage. When the voltages of 12V and 5V are too high, the first three-terminal adjustable reference source will pull down the negative end of the optocoupler diode, turning on the optocoupler, and the optocoupler three-stage tube ends are turned on at the same time, and the resonant controller reduces the duty cycle of the N-type field effect tube, or increases the output frequency to adjust the output voltage.

[0057] In the above, the 5VS feedback unit is used to put the power supply in standby mode when the value of the switch signal input is higher than the set threshold value. The 5VS feedback unit is composed of a second three-terminal adjustable reference source and a +12V / 5V feedback unit sharing an optocoupler to adjust the 5VS standby voltage. The second three-terminal adjustable reference source samples the 5VS standby voltage. When the output voltage is too high, the second three-terminal adjustable reference source pulls down the negative terminal voltage of the optocoupler diode, turning on the optocoupler, and the optocoupler tertiary tube terminals are turned on at the same time, allowing the resonant controller to reduce the duty cycle of the N-type field effect tube, or increase the output frequency to adjust the output voltage.

[0058] In the above, the first output rectification unit is composed of two first N-type field effect transistors and a first synchronous rectification controller. The drain of the first N-type field effect transistor is connected to the secondary winding, the source is connected to the output ground, and the gate is connected to the first synchronous rectification controller. When it is detected that the current flowing through the body diode of the first N-type field effect transistor reaches the threshold value set by the first synchronous rectification controller, the first synchronous rectification controller gives a driving voltage to turn on the first N-type field effect transistor to achieve the purpose of rectification.

[0059] The second output rectification unit is composed of two second N-type field effect transistors and a second synchronous rectification controller. The drain of the second N-type field effect transistor is connected to the secondary winding, the source is connected to the output ground, and the gate is connected to the second synchronous rectification controller. When it is detected that the current flowing through the body diode of the second N-type field effect transistor reaches the threshold set by the second synchronous rectification controller, the second synchronous rectification controller provides a driving voltage to turn on the second N-type field effect transistor to achieve the purpose of rectification.

[0060] In the above, the +12V output control unit samples the 12V output voltage by the voltage-dividing resistor, adjusts the first N-type field effect tube, so that the output voltage meets the full load specification requirements. When working under extreme load conditions, the source of the first N-type field effect tube is connected to the 12V output terminal, the drain is connected to the power output after rectification and filtering, and the gate is connected to the first three-terminal adjustable reference source control electrode. When the first three-terminal adjustable reference source (TL431) detects that the 12V voltage is too high, the first three-terminal adjustable reference source pulls the gate voltage of the first N-type field effect tube low, so that the first N-type field effect tube works in an amplified state, thereby reducing the output voltage and meeting the use requirements;

[0061] The +5V output control unit samples the 5V output voltage by a voltage-dividing resistor and adjusts the second N-type field effect tube to make the output voltage fully loaded with specification requirements. When working under extreme load conditions, the source of the first N-type field effect tube is connected to the 5V output terminal, the drain is connected to the power supply output after rectification and filtering, and the gate is connected to the second three-terminal adjustable reference source control electrode. When the first three-terminal adjustable reference source detects that the 12V voltage is too high, the second three-terminal adjustable reference source lowers the gate voltage of the second N-type field effect tube, so that the second N-type field effect tube works in an amplified state, thereby reducing the output voltage and meeting the use requirements.

[0062] In the above, the +3.3V DC-DC unit contains a high-efficiency buck controller that converts 5V to 3.3V.

[0063] In the above, the +3.3V output unit is output after 3.3V filtering.

[0064] In the above, the protection unit includes 12V / 5V / 3.3 / -12V undervoltage, overvoltage, overcurrent, and overtemperature protection. It also includes PG (power is ready) signal control and ON / OFF control signal IC, which controls the above protection and control signals to make the power supply work normally and have protection functions.

[0065] In the above, the +5VS output control unit is composed of 5VS filtering and overcurrent protection. The overcurrent protection adopts a recoverable overcurrent fuse. When the current exceeds the usage specification, the recoverable fuse is in a high impedance state to achieve the protection function.

[0066] The working principle of the resonant conversion in the present invention is: the AC voltage is rectified and filtered, and a high-voltage DC power is obtained after the voltage is stepped up, and the DC power is output through an LLC resonant conversion network and rectified. The basic principle is as follows (refer to Figure 2 , Figure 3 )

[0067] The resonant converter controller generates a square wave generator that generates a square wave voltage by alternately driving switches Q1 and Q2 at a 50% duty cycle each time the switch is switched. The square wave generator stage can be designed as a full bridge or half bridge type.

[0068] The resonant network consists of a capacitor, the leakage inductance of the transformer and the magnetizing inductance. The resonant network can filter out higher harmonic currents. Therefore, even if a square wave voltage is applied to the resonant network, essentially only sinusoidal current is allowed to flow through the resonant network. The current lags behind the voltage applied to the resonant network (that is, the fundamental of the square wave voltage applied to the half-bridge), which allows zero voltage to turn on the MOSFET. It can be seen that when the current flows through the anti-parallel diodes S1, S2, the MOSFET turn-on voltage is zero.

[0069] The rectifier network adjusts the AC power through rectification and capacitors, and outputs a DC voltage. The rectifier network can be designed as a full-wave bridge or center-tapped structure with a capacitor output filter.

[0070] refer to Figure 3-Figure 5 Working principle: After the high-voltage DC passes through S1 and S2 (S1-S8 are all N-channel MOS with body diodes) to generate an interlaced square wave voltage (duty cycle 50%), the energy is transferred to the secondary winding of the transformer. The center tap of the secondary winding N3 senses the voltage output 5VS, and the current flows through the ground terminal back to S5 or S6, and flows back to the transformer winding N3 through the synchronous rectification controller. If the ON / OFF control signal of the protection IC has been turned on at this time, a signal will be given through the optocoupler controller to turn on S7 and S8. At this time, the center tap voltage of the secondary winding N2 of the transformer flows through the capacitor filter S7, returns to the ground line, and then flows back to the transformer winding through S3 or S4 to form a loop. The center tap of the secondary winding N3 senses the voltage flowing through S8, and the current flows through the ground terminal back to S5 or S6 to form a loop. When 12V is output, 3.3V DC-DC and -12V DC-DC are controlled to output both at the same time. Two TL431 resistors are added at S7 and S8 for sampling, so that the output voltage can be fine-tuned under extreme load conditions.

[0071] Feedback circuit When a single group of 5VS is output, TL431 M16 works. When the 5VS voltage is too high, it is fed back to the primary side through the optocoupler to reduce the feedback voltage, so that the assisting controller adjusts the frequency or duty cycle, reduces the energy on the secondary side, and achieves a stable 5VS voltage. At this time, M2 does not work. When the main output 12V 5V is already output, +12V controls Q1 to turn on and reduce the M16 reference voltage. At this time, M2 automatically works because M2 is a reference point for 5V and 12V sampling. Therefore, the 12V, 5V output voltage can be passed through TL431 and the optocoupler to give a signal to adjust the energy on the primary side to adjust the output voltage.

[0072] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single transformer multi-output power supply based on a resonant architecture, characterized in that: include An AC input unit connected to the electromagnetic filtering unit, the AC input unit is used to input 85-300 V AC power, and the electromagnetic filtering unit is used to filter the input 85-300 V AC power; A rectifier unit is connected to the electromagnetic filter unit, and is used to convert the AC power filtered by the electromagnetic filter unit into DC power. The boost unit is connected to the rectifier unit, and the boost unit uses the PFC line unit to boost the DC power converted by the rectifier unit according to a set threshold value. A capacitor filter unit is connected to the boost unit, and the capacitor filter unit outputs a capacitor through capacitor filtering. Stable direct current, The feedback unit is adjusted and connected to the capacitor filter unit to collect the high-voltage filter capacitor voltage of the capacitor filter unit and feed it back to the resonance control IC unit. The resonance control IC unit is connected to the adjustment feedback unit, the boost unit and the resonant frame main transformer respectively. The resonance control IC unit is used to receive the high-voltage filter capacitor voltage collected by the adjustment feedback unit, and the received high-voltage filter capacitor voltage is used for controlling the boost unit to provide rectangular wave drive PFC line MOS operation and resonant MOS operation. The resonant frame main transformer is connected to the resonant control IC unit. The resonant frame main transformer converts the high-voltage rectangular wave voltage into a low-voltage rectangular wave voltage by adjusting the number of turns and the turn ratio of the winding. At least one output rectifier module is provided on the main transformer side of the resonant frame. The output rectifier module is composed of two N-type field effect transistors and a synchronous rectifier controller. The output rectifier module outputs the corresponding voltage according to the set voltage regulation rate and efficiency. The output filter module is connected to the output rectifier module. The output filter module is composed of a low-voltage filter capacitor and is used to absorb the ripple current of the output rectifier module. The output control module is connected to the output filter module. The output control module samples the output voltage through the voltage divider resistor to adjust the N-type field effect tube so that the output voltage meets the specification requirements. A protection unit connected to the output control module, the protection unit is used to provide undervoltage, overvoltage, overcurrent, and overtemperature protection; The resonant control IC unit includes a PFC controller and a resonant controller, the PFC controller is connected to the boost unit, and the resonant controller is connected to the resonant frame main transformer; The output filtering module includes a first output filtering unit and a second output filtering unit; The output control module includes a +12V output control unit and a +5V output control unit. The first output rectifier unit is connected to the first output filter unit, the first output filter unit is connected to the +12V output control unit, the second output rectifier unit is connected to the second output filter unit, the second output filter unit is connected to the +5V output control unit, the +12V output control unit and the +5V output control unit are respectively connected to the +12V / 5V feedback unit, the +12V / 5V feedback unit is interconnected with the 5VS feedback unit and connected to the resonance control IC unit, the 5VS feedback unit is connected to the resonance control IC unit, the +5V output control unit is connected to the +3.3VDC-DC unit, the +3.3VDC-DC unit is connected to the +3.3V output unit, the +3.3V output unit is connected to the protection unit, the +12V output control unit and the +5V output control unit are respectively interconnected with the protection unit, the second output filter unit is connected to the 5VS feedback unit, and the 5VS feedback unit is connected to the +5VS output control unit.

2. The single transformer multi-output power supply based on a resonant architecture according to claim 1, characterized in that: The winding of the resonant frame main transformer includes a primary winding and a secondary winding. The primary winding is provided with rectangular wave energy through an N-type field effect transistor, and the secondary winding outputs rectangular wave energy after being coupled to the energy through a magnetic field.

3. The single transformer multi-output power supply based on a resonant architecture according to claim 1, characterized in that: The output rectifying module comprises a first output rectifying unit and a second output rectifying unit.

4. The single transformer multi-output power supply based on a resonant architecture according to claim 1, characterized in that: The +12V / 5V feedback unit is used for sampling the 12V output and 5V output voltages simultaneously with the sampling resistor when the value of the switch signal input is lower than the set threshold value, and feeding them to the feedback terminal, and feeding them back to the primary resonant controller through the first three-terminal adjustable reference source and the optocoupler to adjust the output voltage. When the voltages of 12V and 5V are too high, the first three-terminal adjustable reference source will pull down the negative end of the optocoupler diode, turning on the optocoupler, and turning on the optocoupler three-stage tube ends at the same time, and the resonant controller reduces the duty cycle of the N-type field effect tube, or increases the output frequency to adjust the output voltage.

5. The single transformer multi-output power supply based on a resonant architecture according to claim 1, characterized in that: The 5VS feedback unit is used to put the power supply in standby mode when the value of the switch signal input is higher than the set threshold value. The 5VS feedback unit is composed of a second three-terminal adjustable reference source and a +12V / 5V feedback unit sharing an optocoupler to adjust the 5VS standby voltage. The second three-terminal adjustable reference source samples the 5VS standby voltage. When the output voltage is too high, the second three-terminal adjustable reference source pulls down the negative terminal voltage of the optocoupler diode to turn on the optocoupler. The optocoupler tertiary tube terminals are turned on at the same time, allowing the resonant controller to reduce the duty cycle of the N-type field effect tube, or increase the output frequency to adjust the output voltage.

6. The single transformer multi-output power supply based on a resonant architecture according to claim 1, characterized in that: The first output rectification unit is composed of two first N-type field effect transistors and a first synchronous rectification controller. The drain of the first N-type field effect transistor is connected to the secondary winding, the source is connected to the output ground, and the gate is connected to the first synchronous rectification controller. When it is detected that the current flowing through the body diode of the first N-type field effect transistor reaches the threshold set by the first synchronous rectification controller, the first synchronous rectification controller gives a driving voltage to turn on the first N-type field effect transistor to achieve the purpose of rectification. The second output rectification unit is composed of two second N-type field effect transistors and a second synchronous rectification controller. The drain of the second N-type field effect transistor is connected to the secondary winding, the source is connected to the output ground, and the gate is connected to the second synchronous rectification controller. When it is detected that the current flowing through the body diode of the second N-type field effect transistor reaches the threshold set by the second synchronous rectification controller, the second synchronous rectification controller gives a driving voltage to turn on the second N-type field effect transistor to achieve the purpose of rectification.

7. The single transformer multi-output power supply based on a resonant architecture according to claim 1, characterized in that: The +12V output control unit samples the 12V output voltage by a voltage-dividing resistor, adjusts the first N-type field effect tube, and makes the output voltage fully loaded with specification requirements. When working under extreme load conditions, the source of the first N-type field effect tube is connected to the 12V output terminal, the drain is connected to the power output after rectification and filtering, and the gate is connected to the first three-terminal adjustable reference source control electrode. When the first three-terminal adjustable reference source detects that the 12V voltage is too high, the first three-terminal adjustable reference source pulls the gate voltage of the first N-type field effect tube low, so that the first N-type field effect tube works in an amplified state, thereby reducing the output voltage and meeting the use requirements; The +5V output control unit samples the 5V output voltage by a voltage-dividing resistor and adjusts the second N-type field effect tube to make the output voltage fully loaded with specification requirements. When working under extreme load conditions, the source of the first N-type field effect tube is connected to the 5V output terminal, the drain is connected to the power supply output after rectification and filtering, and the gate is connected to the second three-terminal adjustable reference source control electrode. When the first three-terminal adjustable reference source detects that the 12V voltage is too high, the second three-terminal adjustable reference source lowers the gate voltage of the second N-type field effect tube, so that the second N-type field effect tube works in an amplified state, thereby reducing the output voltage and meeting the use requirements.

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