CN218217114U - Multi-output power supply - Google Patents

Abstract

The utility model provides a multichannel output power, this multichannel output power includes rectifier and filter module, resonance transform module, transformer and at least one way rectifier module, and wherein, the secondary winding of transformer includes that at least one group takes a percentage, rectifies the alternating voltage of at least one group of output of taking a percentage through at least one way rectifier module alright directly output a supply voltage to the conversion efficiency of multichannel output power has showing and has promoted.

Description

Multi-output power supply

Technical Field

The present disclosure relates to power supply technologies, and in particular, to a multi-output power supply.

Background

The multi-output power supply is used for outputting various different power supply voltages so as to meet the power consumption requirements of different power consumption modules at the same time. At present, a multi-output power supply applied in the industry generally outputs a supply voltage through a transformer, and converts the supply voltage into different supply voltages through a plurality of DC-DC lines. For example, for a multi-output power source capable of outputting +12V, +3.3V, +5V, -12V, a +12V supply voltage is usually obtained through a transformer, and then the +12V supply voltage is converted into +3.3V, +5V and-12V supply voltages through three DC-DC lines, respectively. Although the multi-output power supply with the structure can realize the gold medal with the efficiency certification of 80+, further improvement of the power supply conversion efficiency is difficult.

Disclosure of Invention

In view of this, the present disclosure provides a multi-output power supply, which can significantly improve the conversion efficiency of the power supply.

According to an aspect of the present disclosure, there is provided a multi-output power supply including: the device comprises a rectification filtering module, a resonance transformation module, a transformer and at least one path of rectification module;

the secondary winding of the transformer comprises at least one group of taps, wherein the taps in the secondary winding of the transformer correspond to the rectifier modules one to one;

the input end of the rectification filter module is suitable for being electrically connected with an input power supply, and the output end of the rectification filter module is electrically connected with the input end of the resonance transformation module, so that the rectification filter module rectifies and filters the input power supply and then inputs the rectified and filtered input power supply to the resonance transformation module;

the output end of the resonance transformation module is electrically connected with the primary winding of the transformer;

each group of taps of the secondary winding of the transformer is correspondingly and electrically connected with the input end of the rectifier module of each path, so that each path of rectifier module rectifies different power supply voltages output by the transformer and then outputs the rectified power supply voltages;

the output end of the rectifying module of each path is used as the output end of the multi-path output power supply and is respectively used for outputting different rectified power supply voltages;

the output ends of the rectifying modules are electrically connected with capacitors; and the capacitor is not electrically connected with one end of the output end of the rectifier module, and the center tap of the secondary winding of the transformer is grounded.

In one possible implementation, the resonance transformation module includes: the resonant circuit comprises a first field effect tube S1, a second field effect tube S2, a first capacitor CR, a first inductor LR and a resonant controller;

a first output end and a second output end of the resonance controller are respectively and electrically connected with a grid electrode of the first field effect transistor S1 and a grid electrode of the second field effect transistor S2;

a source electrode of the first field effect transistor S1 is used as a first input end of the resonance transformation module and is electrically connected with a first output end of the rectification filter module;

the drain electrode of the second field effect tube S2 is used as a second input end of the resonance conversion module and is electrically connected with a second output end of the rectification filter module;

the drain electrode of the first field effect transistor S1 is electrically connected with the source electrode of the second field effect transistor S2;

the first inductor LR is electrically connected between the drain electrode of the first field effect transistor S1 and the first end of the primary winding of the transformer;

the first capacitor CR is electrically connected between the drain of the second fet S2 and the second end of the primary winding of the transformer.

In a possible implementation manner, the rectification module is provided with three paths, namely a first rectification module, a second rectification module and a third rectification module;

correspondingly, the secondary winding of the transformer comprises 3 groups of taps, namely a first group of taps, a second group of taps and a third group of taps.

In one possible implementation, the first rectification module includes: a third field effect transistor S3, a third rectification controller, a fourth field effect transistor S4 and a fourth rectification controller;

the third rectification controller and the fourth rectification controller are respectively and electrically connected with a grid electrode of the third field effect transistor S3 and a grid electrode of the fourth field effect transistor S4;

the drain electrode of the third field effect transistor S3 is electrically connected to the first end of the first group of taps of the secondary winding of the transformer as the first input end of the first rectification module, and the drain electrode of the fourth field effect transistor S4 is electrically connected to the second end of the first group of taps of the secondary winding of the transformer as the second input end of the first rectification module;

and the source electrode of the third field-effect tube S3 is electrically connected with the source electrode of the fourth field-effect tube S4 and then is used as the output end of the first rectifying module for outputting the rectified first power supply voltage.

In one possible implementation, the second rectification module includes: a fifth field effect transistor S5, a fifth rectification controller, a sixth field effect transistor S6 and a sixth rectification controller;

the fifth rectification controller and the sixth rectification controller are respectively and electrically connected with the grid electrode of the fifth field effect transistor S5 and the grid electrode of the sixth field effect transistor S6;

a drain electrode of the fifth field effect transistor S5 serving as a first input end of the second rectification module is electrically connected with a first end of the second group of taps of the secondary winding of the transformer, and a drain electrode of the sixth field effect transistor S6 serving as a second input end of the second rectification module is electrically connected with a second end of the second group of taps of the secondary winding of the transformer;

and the source electrode of the fifth field-effect tube S5 is electrically connected with the source electrode of the sixth field-effect tube S6 and then is used as the output end of the second rectifying module for outputting the rectified second power supply voltage.

In one possible implementation, the third rectification module includes: a seventh field effect transistor S7, a seventh rectification controller, an eighth field effect transistor S8 and an eighth rectification controller;

the seventh rectifying controller and the eighth rectifying controller are respectively electrically connected with the grid electrode of the seventh field-effect tube S7 and the grid electrode of the eighth field-effect tube S8;

a drain electrode of the seventh field effect transistor S7 serving as a first input end of the third rectification module is electrically connected to a first end of the third group of taps of the secondary winding of the transformer, and a drain electrode of the eighth field effect transistor S8 serving as a second input end of the third rectification module is electrically connected to a second end of the third group of taps of the secondary winding of the transformer;

and a source electrode of the seventh field-effect transistor S7 is electrically connected with a source electrode of the eighth field-effect transistor S8 and then serves as an output end of the third rectifying module, and is used for outputting a rectified third supply voltage.

In a possible implementation manner, the multi-output power supply further includes a power protection module and three linear voltage regulation modules, where the three linear voltage regulation modules are respectively a first linear voltage regulation module, a second linear voltage regulation module, and a third linear voltage regulation module;

the output end of the power supply protection module is electrically connected with the first input end of the first linear voltage stabilizing module, the second input end of the first linear voltage stabilizing module is electrically connected with the output end of the first rectifying module, the output end of the first linear voltage stabilizing module is used as the first output end of the multi-path output power supply and used for outputting a first power supply voltage, and the first linear voltage stabilizing module further comprises a grounding end;

a first input end of the second linear voltage stabilizing module is electrically connected with an output end of the first linear voltage stabilizing module, a second input end of the second linear voltage stabilizing module is electrically connected with an output end of the second rectifying module, an output end of the second linear voltage stabilizing module is used as a second output end of the multi-path output power supply and used for outputting a second power supply voltage, and the second linear voltage stabilizing module further comprises a grounding end;

the first input end of the third linear voltage stabilizing module is electrically connected with the output end of the first linear voltage stabilizing module, the second input end of the third linear voltage stabilizing module is electrically connected with the output end of the third rectifying module, the output end of the third linear voltage stabilizing module is used as the third output end of the multi-path output power supply and used for outputting a third power supply voltage, and the third linear voltage stabilizing module further comprises a grounding end;

the power protection circuit comprises a power protection module, a power supply module and a power supply module, wherein a first input end of the power protection module is used for receiving a switching signal of a multi-path output power supply, a second input end of the power protection module is used for receiving a PG signal of the multi-path output power supply, and a third input end of the power protection module is used for being electrically connected with a secondary input power supply.

In a possible implementation manner, the first linear voltage stabilizing module includes a resistor R8, a ninth fet S9, a resistor R15, a resistor R16, and a three-terminal adjustable reference source M9, a first terminal of the resistor R8 serves as a first input terminal of the first linear voltage stabilizing module, a second terminal of the resistor R8 is electrically connected to a gate of the ninth fet S9, a drain of the ninth fet S9 serves as a second input terminal of the first linear voltage stabilizing module, a source of the ninth fet S9 serves as an output terminal of the first linear voltage stabilizing module, the resistor R15, the resistor R16, and the three-terminal adjustable reference source M9 are electrically connected in sequence and then connected between the source of the ninth fet S9 and the gate of the ninth fet S9, a reference electrode of the three-terminal adjustable reference source M9 is electrically connected between the resistor R15 and the resistor R16, and a connection point of an anode of the three-terminal adjustable reference source M9 and the resistor R16 serves as a ground terminal of the first linear voltage stabilizing module;

the second linear voltage stabilizing module comprises a resistor R9, a tenth field effect transistor S10, a resistor R13, a resistor R14 and a three-terminal adjustable reference source M8, wherein a first end of the resistor R9 is used as a first input end of the second linear voltage stabilizing module, a second end of the resistor R9 is electrically connected to a grid electrode of the tenth field effect transistor S10, a drain electrode of the tenth field effect transistor S10 is used as a second input end of the second linear voltage stabilizing module, a source electrode of the tenth field effect transistor S10 is used as an output end of the second linear voltage stabilizing module, the resistor R13, the resistor R14 and the three-terminal adjustable reference source M8 are sequentially and electrically connected between the source electrode of the tenth field effect transistor S10 and the grid electrode of the tenth field effect transistor S10, a reference electrode of the three-terminal adjustable reference source M8 is electrically connected between the resistor R13 and the resistor R14, and a connection point of an anode of the three-terminal adjustable reference source M8 and the resistor R14 is used as a grounding end of the second linear voltage stabilizing module;

the third linear voltage stabilizing module comprises a resistor R10, an eleventh field-effect tube S11, a resistor R12 and a three-terminal adjustable reference source M7, wherein a first end of the resistor R10 is used as a first input end of the third linear voltage stabilizing module, a second end of the resistor R10 is electrically connected to a grid electrode of the eleventh field-effect tube S11, a drain electrode of the eleventh field-effect tube S11 is used as a second input end of the third linear voltage stabilizing module, a source electrode of the eleventh field-effect tube S11 is used as an output end of the third linear voltage stabilizing module, the resistor R11, the resistor R12 and the three-terminal adjustable reference source M7 are sequentially and electrically connected between the source electrode of the eleventh field-effect tube S11 and the grid electrode of the eleventh field-effect tube S11, a reference electrode of the three-terminal adjustable reference source M7 is electrically connected between the resistor R11 and the resistor R12, and a connection point of the three-terminal adjustable reference source M7 is grounded and used as a grounding end of the third linear voltage stabilizing module.

In one possible implementation manner, the multi-output power supply further includes an output voltage feedback module;

the output voltage feedback module is electrically connected between the output end of at least one path of the rectifying module and the input end of the resonant conversion module, so that the sampled power supply voltage at the output end of the rectifying module is fed back to the resonant conversion module.

In the disclosure, the secondary winding of the transformer comprises at least one group of taps, and the alternating-current voltage output by the at least one group of taps can be directly output a power supply voltage after being rectified by the at least one path of rectifying module, so that the conversion efficiency of the power supply reaches more than 99%, and the conversion efficiency of the multi-output power supply is remarkably improved.

Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

FIG. 1 shows a circuit diagram of a multiple output power supply of an embodiment of the present disclosure;

fig. 2 shows a circuit diagram of a multiple output power supply of another embodiment of the present disclosure.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

It will be understood, however, that the terms "central," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing or simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.

Fig. 1 shows a circuit diagram of a multiple output power supply according to an embodiment of the present disclosure. As shown in fig. 1, the multiple output power supply includes: the device comprises a rectifying and filtering module 100, a resonant transformation module 200, a transformer 300 and at least one path of rectifying module 400.

The input end of the rectifying and filtering module 100 is suitable for being electrically connected with an input power supply, and the input power supply can output 85-300V alternating current. The output end of the rectifying and filtering module 100 is electrically connected to the input end of the resonant transformation module 200, so that the rectifying and filtering module 100 rectifies and filters the input ac power and inputs the rectified and filtered ac power to the resonant transformation module 200.

In one possible implementation, the rectifying and filtering module 100 includes an electromagnetic filtering unit and a rectifying unit electrically connected in sequence. The input end of the electromagnetic filtering unit is used as the input end of the rectifying and filtering module 100, and the output end of the rectifying unit is used as the output end of the rectifying and filtering module 100. After the ac power output by the input power is input to the rectification filter module 100, the input ac power is filtered by the electromagnetic filter unit to reduce electromagnetic interference, and then the rectified ac power is converted into dc power and input to the resonance transformation module 200.

The input terminal of the resonant transformation module 200 is connected to the output terminal of the rectification filter module 100, and the output terminal is electrically connected to the primary winding of the transformer 300, so as to provide a sinusoidal voltage to the primary winding of the transformer 300.

In one possible implementation, the resonant transformation module 200 includes: the resonant circuit comprises a first field effect tube S1, a second field effect tube S2, a first capacitor CR, a first inductor LR and a resonant controller.

In this implementation, the first output terminal and the second output terminal of the resonance controller are electrically connected to the gate of the first field effect transistor S1 and the gate of the second field effect transistor S2, respectively. The source of the first field effect transistor S1 is electrically connected to the first output terminal of the rectification and filtering module 100 as the first input terminal of the resonance transformation module 200, the drain of the second field effect transistor S2 is electrically connected to the second output terminal of the rectification and filtering module 100 as the second input terminal of the resonance transformation module 200, and the drain of the first field effect transistor S1 is electrically connected to the source of the second field effect transistor S2. The first inductor LR is electrically connected between the drain of the first fet S1 and the first end of the primary winding of the transformer 300, and the first capacitor CR is electrically connected between the drain of the second fet S2 and the second end of the primary winding of the transformer 300.

In this implementation manner, the resonant controller alternately drives the field-effect transistor S1 and the field-effect transistor S2 at a duty ratio of 50% each time to generate a square-wave voltage, and then converts the square-wave voltage into a sinusoidal voltage through a resonant network composed of the first capacitor CR and the first inductor LR (i.e., the leakage inductance of the transformer 300), and inputs the sinusoidal voltage to the primary winding of the transformer 300, and the secondary winding of the transformer 300 couples energy through a magnetic field and outputs a corresponding supply voltage.

In the present disclosure, in order to improve the power conversion efficiency of the multi-output power source, a plurality of taps are provided at the secondary winding of the transformer 300 to provide different power supply voltages through the plurality of taps, respectively. For example, 3 taps may be provided at the secondary winding of the transformer 300 to provide 3 different supply voltages through the 3 taps, respectively. As another example, 4 taps may be provided on the secondary winding of the transformer 300 to provide 4 different supply voltages through the 4 taps.

For example, for a multi-output power supply providing three supply voltages of +12V, +5V and +3.3V, 3 sets of taps, a first set of taps, a second set of taps and a third set of taps, are provided at the secondary winding of the transformer 300. Wherein the first set of taps is used to provide a +12V supply voltage, the second set of taps is used to provide a +5V supply voltage, and the third set of taps is used to provide a +3.3V supply voltage.

In this implementation, the turns ratio of the primary winding and the secondary winding of the transformer 300 may be set between 12/1 and 16/1 in order to provide a +12V supply voltage.

In this implementation, the secondary side of the transformer 300 is provided with one winding, and +3.3V and +5V are output in a center-tapped manner. Wherein the third group of taps uses the center tap of 1 turn of the secondary winding to output a +3.3V supply voltage. The second group of taps uses the center tap of the secondary winding with 1.5 turns (i.e., the center tap after 0.5 turns of the +3.3V secondary winding) to output a +5V supply voltage. The first group of taps uses the center tap of the secondary winding for 3.5 turns (i.e. the tap after 2 turns are superimposed on the +5V secondary winding) to output a supply voltage of + 12V.

In the implementation mode, the output voltage staggered adjustment rate can be better after the secondary side and the winding are adopted for outputting, meanwhile, the secondary side copper wires are reduced, the space is enlarged, and the production is convenient.

The rectifier modules 400 are in one-to-one correspondence with taps in the secondary winding of the transformer 300, that is, the number of tap groups in the secondary winding of the transformer 300 is the same as the number of lines of the rectifier modules 400. Each group of taps of the secondary winding of the transformer 300 is electrically connected to the input terminal of each path of the rectifier module 400, so that each path of the rectifier module 400 rectifies and outputs different supply voltages output by the transformer 300, and the output terminal of each path of the rectifier module 400 serves as the output terminal of the multi-path output power supply and is respectively used for outputting different supply voltages after rectification.

For example, for a multi-output power supply providing +12V, +5V and +3.3V, the rectifying module 400 is provided with three paths, namely a first rectifying module, a second rectifying module and a third rectifying module.

In this implementation, the first rectification module includes: a third fet S3, a third commutation controller (i.e., S3 control), a fourth fet S4, and a fourth commutation controller (i.e., S4 control). The third rectification controller and the fourth rectification controller are respectively and electrically connected with the grid electrode of the third field effect transistor S3 and the grid electrode of the fourth field effect transistor S4; the drain of the third fet S3 is electrically connected to the first end of the first group of taps of the secondary winding of the transformer 300 (i.e., IPN 3) as the first input end of the first rectifier module, and the drain of the fourth fet S4 is electrically connected to the second end of the first group of taps of the secondary winding of the transformer 300 (i.e., IPN 9) as the second input end of the first rectifier module; the source of the third fet S3 is electrically connected to the source of the fourth fet S4 and then serves as the output of the first rectifier module, for outputting the rectified first supply voltage, i.e., the +12V supply voltage output by the first rectifier module.

In this implementation, the second rectification module includes: a fifth field effect transistor S5, a fifth commutation controller (i.e., S5 control), a sixth field effect transistor S6, and a sixth commutation controller (i.e., S6 control). The fifth rectification controller and the sixth rectification controller are respectively electrically connected with a grid electrode of the fifth field-effect tube S5 and a grid electrode of the sixth field-effect tube S6; the drain of the fifth fet S5 serving as the first input terminal of the second rectifier module is electrically connected to the first end (i.e., IPN 4) of the second group of taps of the secondary winding of the transformer 300, and the drain of the sixth fet S6 serving as the second input terminal of the second rectifier module is electrically connected to the second end (i.e., IPN 8) of the second group of taps of the secondary winding of the transformer 300; and the source electrode of the fifth field-effect tube S5 is electrically connected with the source electrode of the sixth field-effect tube S6 and then serves as the output end of the second rectifying module, and is used for outputting a rectified second power supply voltage, namely, a +5V power supply voltage output by the second rectifying module.

In this implementation, the third rectification module includes: a seventh fet S7, a seventh commutation controller (i.e., S7 control), an eighth fet S8, and an eighth commutation controller (i.e., S8 control). The seventh rectification controller and the eighth rectification controller are respectively and electrically connected with the grid electrode of the seventh field effect transistor S7 and the grid electrode of the eighth field effect transistor S8; the drain electrode of the seventh field-effect tube S7 serving as the first input end of the third rectifier module is electrically connected to the first end (i.e., IPN 5) of the third group of taps of the secondary winding of the transformer 300, and the drain electrode of the eighth field-effect tube S8 serving as the second input end of the third rectifier module is electrically connected to the second end (i.e., IPN 7) of the third group of taps of the secondary winding of the transformer 300; and the source electrode of the seventh field-effect tube S7 is electrically connected with the source electrode of the eighth field-effect tube S8 and then serves as the output end of the third rectifying module, and is used for outputting a rectified third power supply voltage, namely +3.3V power supply voltage output by the third rectifying module.

In the implementation mode, when the rectification controller of the finishing module detects that the current of the connected field effect transistor reaches the threshold value set by the synchronous rectification controller, the rectification controller outputs the driving voltage to enable the connected field effect transistor to be conducted, so that the rectification purpose is achieved.

In this implementation manner, the output ends of the rectifying modules are all electrically connected with capacitors. Specifically, the output end of the first rectification module is electrically connected with a capacitor C2, the output end of the second rectification module is electrically connected with a capacitor C3, the output end of the third rectification module is electrically connected with a capacitor C, and the end of each of the capacitors C2, C3 and C4 which is not electrically connected with the output end of the rectification module, and the center tap (i.e., IPN 6) of the secondary winding of the transformer 300 are all grounded.

In the implementation mode, three different alternating-current voltages are output through three groups of taps of the secondary winding of the transformer, and then three different alternating-current voltages are rectified through the three rectifying modules respectively to obtain three different direct-current power supply voltages, so that the conversion efficiency of the power supply reaches more than 99%, and the conversion efficiency of the multi-output power supply is remarkably improved.

In this implementation, the second rectification module may include two output terminals, namely a first output terminal and a second output terminal. The first output end is used for outputting +5V power supply voltage, and the second output end outputs 5VS voltage after passing through the current-limiting protector. Thus, the conversion efficiency of 5VS can be improved by more than 13%.

As shown in fig. 2, the multi-output power supply may further include a power protection module 700 and a three-way linear regulator module 500, where the three-way linear regulator module 500 is a first linear regulator module, a second linear regulator module, and a third linear regulator module, respectively.

In this possible implementation, the power protection module 700 includes a protection control module and a first optocoupler M5. A first input terminal of the protection control module is used as a first input terminal of the power protection module 700, and is configured to receive a switching signal (i.e., an ON/OFF signal) of a multi-output power supply. A second input terminal of the protection control module is used as a second input terminal of the power protection module 700, and is configured to receive a PG signal of a multi-output power supply. The output end of the protection control module is electrically connected to the anode of the light emitting diode M5A of the first optocoupler M5, and the cathode of the light emitting diode M5A is grounded. An emitter of a phototransistor M5B of the first optocoupler M5 serves as a third input terminal of the power protection module 700, and is electrically connected to a secondary input power (i.e., a secondary VCC). And the collector electrode of the phototriode M5B is used as the output end of the protection control module and is used for being electrically connected with the first input end of the first linear voltage stabilizing module.

The protection control module can also comprise +12V/+5V/+3.3/-12V undervoltage, overvoltage, overcurrent and overtemperature protection functions so as to ensure the use safety of the multi-output power supply.

The second input terminal of the first linear voltage stabilizing module is electrically connected to the output terminal of the first rectifying module 400, the output terminal of the first linear voltage stabilizing module is used as the first output terminal of the multi-output power supply for outputting the first power supply voltage, and the first linear voltage stabilizing module further includes a ground terminal.

Specifically, the first linear voltage stabilizing module may include a resistor R8, a ninth fet S9, a resistor R15, a resistor R16, and a three-terminal adjustable reference source M9, a first terminal of the resistor R8 serves as a first input terminal of the first linear voltage stabilizing module, a second terminal of the resistor R8 is electrically connected to a gate of the ninth fet S9, a drain of the ninth fet S9 serves as a second input terminal of the first linear voltage stabilizing module, a source of the ninth fet S9 serves as an output terminal of the first linear voltage stabilizing module, the resistor R15, the resistor R16, and the three-terminal adjustable reference source M9 are electrically connected in sequence and then connected between the source of the ninth fet S9 and the gate of the ninth fet S9, a reference electrode of the three-terminal adjustable reference source M9 is electrically connected between the resistor R15 and the resistor R16, and a connection point of an anode of the three-terminal adjustable reference source M9 and the resistor R16 serves as a ground terminal of the first linear voltage stabilizing module.

Under the condition of extreme load, when the first power supply voltage sampled by the voltage dividing resistor R15 is too high, the three-terminal adjustable reference source M9 pulls down the grid voltage of the ninth field-effect tube S9, so that the ninth field-effect tube S9 works in an amplification state, the first power supply voltage is reduced, and the first power supply voltage meets the use requirement.

The first input end of the second linear voltage stabilizing module is electrically connected with the output end of the first linear voltage stabilizing module, the second input end of the second linear voltage stabilizing module is electrically connected with the output end of the second rectifying module 400, the output end of the second linear voltage stabilizing module is used as the second output end of the multi-path output power supply and used for outputting a second power supply voltage, and the second linear voltage stabilizing module further comprises a grounding end.

Specifically, the second linear voltage stabilizing module may include a resistor R9, a tenth fet S10, a resistor R13, a resistor R14, and a three-terminal adjustable reference source M8, a first end of the resistor R9 serves as a first input end of the second linear voltage stabilizing module, a second end of the resistor R9 is electrically connected to a gate of the tenth fet S10, a drain of the tenth fet S10 serves as a second input end of the second linear voltage stabilizing module, a source of the tenth fet S10 serves as an output end of the second linear voltage stabilizing module, the resistor R13, the resistor R14, and the three-terminal adjustable reference source M8 are electrically connected in sequence and then connected between the source of the tenth fet S10 and the gate of the tenth fet S10, a reference electrode of the three-terminal adjustable reference source M8 is electrically connected between the resistor R13 and the resistor R14, and a connection point of an anode of the three-terminal adjustable reference source M8 and the resistor R14 serves as a ground terminal of the second linear voltage stabilizing module.

Under the condition of extreme load, when the second power supply voltage sampled by the voltage dividing resistor R13 is too high, the three-terminal adjustable reference source M8 pulls down the grid voltage of the tenth field-effect tube S10, so that the tenth field-effect tube S10 works in an amplification state, the second power supply voltage is reduced, and the second power supply voltage meets the use requirement.

The first input end of the third linear voltage stabilizing module is electrically connected with the output end of the first linear voltage stabilizing module, the second input end of the third linear voltage stabilizing module is electrically connected with the output end of the third rectifying module 400, the output end of the third linear voltage stabilizing module is used as the third output end of the multi-path output power supply and used for outputting a third power supply voltage, and the third linear voltage stabilizing module further comprises a grounding end.

Specifically, the third linear voltage stabilizing module may include a resistor R10, an eleventh fet S11, a resistor R12, and a three-terminal adjustable reference source M7, a first terminal of the resistor R10 serves as a first input terminal of the third linear voltage stabilizing module, a second terminal of the resistor R10 is electrically connected to a gate of the eleventh fet S11, a drain of the eleventh fet S11 serves as a second input terminal of the third linear voltage stabilizing module, a source of the eleventh fet S11 serves as an output terminal of the third linear voltage stabilizing module, the resistor R11, the resistor R12, and the three-terminal adjustable reference source M7 are electrically connected in sequence and then connected between the source of the eleventh fet S11 and the gate of the eleventh fet S11, a reference electrode of the three-terminal adjustable reference source M7 is electrically connected between the resistor R11 and the resistor R12, and a connection point of an anode of the three-terminal adjustable reference source M7 and the resistor R12 is grounded as a ground terminal of the third linear voltage stabilizing module.

Under the condition of extreme load, when the third power supply voltage sampled by the voltage dividing resistor R11 is too high, the three-terminal adjustable reference source M7 pulls down the gate voltage of the eleventh field-effect transistor S11, so that the eleventh field-effect transistor S11 works in an amplification state, thereby reducing the third power supply voltage and enabling the third power supply voltage to meet the use requirement.

As shown in fig. 2, the multiple output power supply may further include an output voltage feedback module 600.

The output voltage feedback module 600 is electrically connected between the output terminal of the at least one path of rectifier module 400 and the input terminal of the resonant conversion module 200, so as to feed back the sampled power supply voltage at the output terminal of the at least one path of rectifier module 400 to the resonant conversion module 200.

For a multi-output power supply providing +12V, +5V and +3.3V, the output voltage feedback module 600 includes a feedback switching unit, +12V/+5V output voltage feedback unit, a 5VS output voltage feedback unit and a second optocoupler M4.

The feedback switching unit comprises a field effect transistor Q1, a resistor R6 and a resistor R7. The resistor R7 is connected in series between the output end of the first power supply voltage and the grid electrode of the field-effect tube Q1, the drain electrode of the field-effect tube Q1 is grounded, and the source electrode of the field-effect tube Q1 is electrically connected to the second input end of the 5VS output voltage feedback unit.

The 5VS output voltage feedback unit comprises a resistor R4, a resistor R5 and a three-terminal adjustable reference source M16. The resistor R4, the resistor R5 and the three-end adjustable reference source M16 are sequentially and electrically connected and then connected between the 5VS output end and the cathode of the light emitting diode M4A of the second optocoupler M4, the reference electrode of the three-end adjustable reference source M16 is electrically connected between the resistor R4 and the resistor R5, and the connection point of the anode of the three-end adjustable reference source M16 and the resistor R5 serves as the grounding end of the 5VS output voltage feedback unit. One end of the resistor R4 connected with the 5VS output end is a first input end of the 5VS output voltage feedback unit, a connection point between the resistor R4 and the resistor R5 is a second input end of the 5VS output voltage feedback unit, and a connection point of the three-end adjustable reference source M16 and a cathode of a light emitting diode M4A of the second optocoupler M4 is an output end of the 5VS output voltage feedback unit.

The +12V/+5V output voltage feedback unit comprises resistors R2, R3 and R59 and a three-terminal adjustable reference source M2. The resistor R2, the resistor R3 and the three-end adjustable reference source M2 are sequentially electrically connected and then connected between the +12V output end and the cathode of the light emitting diode M4A of the second optocoupler M4, the reference electrode of the three-end adjustable reference source M2 is electrically connected between the resistor R2 and the resistor R3, the connection point of the anode of the three-end adjustable reference source M2 and the resistor R3 serves as the grounding end of the +12V/+5V output voltage feedback unit, the first end of the resistor R59 is electrically connected at the +5V output end, and the second end of the resistor R2 is electrically connected between the resistor R3 and the resistor R2. The end of the resistor R2 connected with the +12V output end is a first input end of the +12V/+5V output voltage feedback unit, the end of the resistor R59 connected with the +5V output end is a second input end of the +12V/+5V output voltage feedback unit, and the connection point of the three-end adjustable reference source M2 and the cathode of the light emitting diode M4A of the second optocoupler M4 is an output end of the +12V/+5V output voltage feedback unit.

The anode of the light emitting diode M4A of the second optocoupler M4 is connected with the 5VS output end, the emitter of the phototriode M4B of the second optocoupler M2 is connected with the RTN1, and the collector of the phototriode M4B of the second optocoupler M2 is connected with the input end of the resonance controller.

When the ON/OFF signal is high, the power supply is in a standby mode, and the feedback switching unit controls the +12V/+5V output voltage feedback unit to work to regulate the +12V/+5V output voltage. Specifically, when the +5V power supply voltage sampled by the resistor R59 is too high and/or the +12V power supply voltage sampled by the resistor R2 is too high, the negative terminal voltage of the light emitting diode M4A of the second optocoupler M4 is pulled down by the three-terminal adjustable reference source M2 to be conducted, and the phototriode M4B is conducted at the same time, so that the resonant controller knows that the output energy is too much, and the output voltage needs to be adjusted by means of reducing the duty ratio of the primary side field effect transistor or improving the output frequency, and the +12V and +5V power supply voltages meet the use requirements.

The operation principle of the multi-output power supply will be described with reference to fig. 2. Specifically, after the high-voltage direct current generates staggered square wave voltage (with a duty ratio of 50%) through S1 and S2 (S1-S11 are all N-channel MOS strip body diodes), energy is transmitted to a secondary winding of the transformer, a second group of taps of the secondary winding sense voltage and output 5VS, current flows through S5 and S6 and then is output, and the current flows back to a tap PIN6 of the transformer through an output load. If the ON/OFF control signal of the protection IC has been given ON at this time, the optocoupler M5 gives a signal to turn ON S9, S10 and S11, at this time, the voltage of the transformer tap PIN3 flows through S3, the S9 output load returns to the ground, when the current half cycle is turned ON, the transformer tap PIN9 again passes through S4, S9 and the output load to return to the ground of the transformer, and thus, a supply voltage of +12V is generated. The voltage at the transformer tap PIN4 flows through S5, S10 and the output load back to ground, and when the lower half cycle is on, the transformer tap PIN8 again flows through S6, S10 and the output load back to the ground of the transformer, thus generating a +5V supply voltage. The voltage at the transformer tap PIN5 flows through S7, S11 and the output load back to ground, and when the lower half cycle is on, the transformer tap PIN7 again flows through S8, S11 and the output load back to the ground of the transformer, thus generating a supply voltage of + 3.3V. A three-terminal adjustable reference source TL431 and a sampling resistor are added at S9, S10 and S11 to form 3 linear voltage stabilizing circuits, so that the output voltage can be finely adjusted under the condition of extreme load.

When the output voltage feedback circuit outputs +5VS in a single group, TL431M16 works, when the voltage of 5VS is too high, the voltage is fed back to the primary side through an optocoupler M4, so that the resonant controller adjusts the frequency or the duty ratio to reduce the energy of the secondary side and achieve the purpose of stabilizing the voltage of +5VS, and at the moment, M2 does not work. When the main output +12V and +5V have output, the +12V controls the Q1 to be conducted, the M16 reference voltage is reduced, the M2 works automatically and controls, and the M2 is a reference point for sampling +5V and +12V together, so when the +12V and/or +5V output voltage is too high, the frequency or the duty ratio is fed back to the primary side through the optocoupler M4, the resonant controller is enabled to adjust the frequency or the duty ratio, the energy of the secondary side is reduced, and the purpose of stabilizing the +12V and +5V power supply voltage is achieved.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (9)

1. A multiple output power supply, comprising: the device comprises a rectification filtering module, a resonance transformation module, a transformer and at least one path of rectification module;

the secondary winding of the transformer comprises at least one group of taps, wherein the taps in the secondary winding of the transformer correspond to the rectifier modules one to one;

the input end of the rectification filter module is suitable for being electrically connected with an input power supply, and the output end of the rectification filter module is electrically connected with the input end of the resonance transformation module, so that the rectification filter module rectifies and filters the input power supply and then inputs the rectified and filtered input power supply to the resonance transformation module;

the output end of the resonance transformation module is electrically connected with the primary winding of the transformer;

each group of taps of the secondary winding of the transformer is correspondingly and electrically connected with the input end of the rectifier module of each path, so that each path of rectifier module rectifies different power supply voltages output by the transformer and then outputs the rectified power supply voltages;

the output end of the rectifying module of each path is used as the output end of the multi-path output power supply and is respectively used for outputting different rectified power supply voltages;

the output ends of the rectifying modules are electrically connected with capacitors; and the capacitor is not electrically connected with one end of the output end of the rectifier module, and the center tap of the secondary winding of the transformer is grounded.

2. The multi-output power supply of claim 1, wherein the resonant transformation module comprises: the resonant circuit comprises a first field effect tube S1, a second field effect tube S2, a first capacitor CR, a first inductor LR and a resonant controller;

a first output end and a second output end of the resonance controller are respectively and electrically connected with a grid electrode of the first field effect transistor S1 and a grid electrode of the second field effect transistor S2;

a source electrode of the first field effect transistor S1 is used as a first input end of the resonance transformation module and is electrically connected with a first output end of the rectification filter module;

the drain electrode of the second field effect tube S2 is used as a second input end of the resonance conversion module and is electrically connected with a second output end of the rectification filter module;

the drain electrode of the first field effect transistor S1 is electrically connected with the source electrode of the second field effect transistor S2;

the first inductor LR is electrically connected between the drain electrode of the first field effect transistor S1 and the first end of the primary winding of the transformer;

the first capacitor CR is electrically connected between the drain of the second fet S2 and the second end of the primary winding of the transformer.

3. The multi-output power supply according to claim 1, wherein the rectification modules are provided in three paths, namely a first rectification module, a second rectification module and a third rectification module;

correspondingly, the secondary winding of the transformer comprises 3 groups of taps, namely a first group of taps, a second group of taps and a third group of taps.

4. The multi-output power supply according to claim 3, wherein the first rectification module comprises: a third field effect transistor S3, a third rectification controller, a fourth field effect transistor S4 and a fourth rectification controller;

the third rectification controller and the fourth rectification controller are respectively and electrically connected with the grid electrode of the third field effect transistor S3 and the grid electrode of the fourth field effect transistor S4;

the drain electrode of the third field effect transistor S3 is electrically connected to the first end of the first group of taps of the secondary winding of the transformer as the first input end of the first rectification module, and the drain electrode of the fourth field effect transistor S4 is electrically connected to the second end of the first group of taps of the secondary winding of the transformer as the second input end of the first rectification module;

and the source electrode of the third field-effect tube S3 is electrically connected with the source electrode of the fourth field-effect tube S4 and then is used as the output end of the first rectifying module for outputting the rectified first power supply voltage.

5. The multi-output power supply of claim 3, wherein the second rectifying module comprises: a fifth field effect transistor S5, a fifth rectification controller, a sixth field effect transistor S6 and a sixth rectification controller;

the fifth rectification controller and the sixth rectification controller are respectively and electrically connected with the grid electrode of the fifth field effect transistor S5 and the grid electrode of the sixth field effect transistor S6;

a drain electrode of the fifth field effect transistor S5 serving as a first input end of the second rectification module is electrically connected with a first end of the second group of taps of the secondary winding of the transformer, and a drain electrode of the sixth field effect transistor S6 serving as a second input end of the second rectification module is electrically connected with a second end of the second group of taps of the secondary winding of the transformer;

and the source electrode of the fifth field-effect tube S5 is electrically connected with the source electrode of the sixth field-effect tube S6 and then is used as the output end of the second rectifying module for outputting the rectified second power supply voltage.

6. The multi-output power supply of claim 3, wherein the third rectifying module comprises: a seventh field effect transistor S7, a seventh rectification controller, an eighth field effect transistor S8 and an eighth rectification controller;

the seventh rectifying controller and the eighth rectifying controller are respectively electrically connected with the grid electrode of the seventh field-effect tube S7 and the grid electrode of the eighth field-effect tube S8;

a drain electrode of the seventh field effect transistor S7 serving as a first input end of the third rectification module is electrically connected to a first end of the third group of taps of the secondary winding of the transformer, and a drain electrode of the eighth field effect transistor S8 serving as a second input end of the third rectification module is electrically connected to a second end of the third group of taps of the secondary winding of the transformer;

and a source electrode of the seventh field-effect tube S7 is electrically connected with a source electrode of the eighth field-effect tube S8 and then serves as an output end of the third rectification module, so as to output a rectified third power supply voltage.

7. The multi-output power supply according to claim 3, further comprising a power protection module and a three-way linear regulator module, wherein the three-way linear regulator module is a first linear regulator module, a second linear regulator module and a third linear regulator module respectively;

the output end of the power supply protection module is electrically connected with the first input end of the first linear voltage stabilizing module, the second input end of the first linear voltage stabilizing module is electrically connected with the output end of the first rectifying module, the output end of the first linear voltage stabilizing module is used as the first output end of the multi-path output power supply and used for outputting a first power supply voltage, and the first linear voltage stabilizing module further comprises a grounding end;

a first input end of the second linear voltage stabilizing module is electrically connected with an output end of the first linear voltage stabilizing module, a second input end of the second linear voltage stabilizing module is electrically connected with an output end of the second rectifying module, an output end of the second linear voltage stabilizing module is used as a second output end of the multi-path output power supply and used for outputting a second power supply voltage, and the second linear voltage stabilizing module further comprises a grounding end;

the first input end of the third linear voltage stabilizing module is electrically connected with the output end of the first linear voltage stabilizing module, the second input end of the third linear voltage stabilizing module is electrically connected with the output end of the third rectifying module, the output end of the third linear voltage stabilizing module is used as the third output end of the multi-path output power supply and used for outputting a third power supply voltage, and the third linear voltage stabilizing module further comprises a grounding end;

the power protection circuit comprises a power protection module, a power supply module and a power supply module, wherein a first input end of the power protection module is used for receiving a switching signal of a multi-path output power supply, a second input end of the power protection module is used for receiving a PG signal of the multi-path output power supply, and a third input end of the power protection module is used for being electrically connected with a secondary input power supply.

8. The multi-output power supply of claim 7,

the first linear voltage stabilizing module comprises a resistor R8, a ninth field-effect tube S9, a resistor R15, a resistor R16 and a three-terminal adjustable reference source M9, wherein a first end of the resistor R8 is used as a first input end of the first linear voltage stabilizing module, a second end of the resistor R8 is electrically connected to a grid electrode of the ninth field-effect tube S9, a drain electrode of the ninth field-effect tube S9 is used as a second input end of the first linear voltage stabilizing module, a source electrode of the ninth field-effect tube S9 is used as an output end of the first linear voltage stabilizing module, the resistor R15, the resistor R16 and the three-terminal adjustable reference source M9 are sequentially and electrically connected between the source electrode of the ninth field-effect tube S9 and the grid electrode of the ninth field-effect tube S9, a reference electrode of the three-terminal adjustable reference source M9 is electrically connected between the resistor R15 and the resistor R16, and a connection point of an anode of the three-terminal adjustable reference source M9 and the resistor R16 is used as a grounding end of the first linear voltage stabilizing module;

the second linear voltage stabilizing module comprises a resistor R9, a tenth field effect transistor S10, a resistor R13, a resistor R14 and a three-terminal adjustable reference source M8, wherein a first end of the resistor R9 is used as a first input end of the second linear voltage stabilizing module, a second end of the resistor R9 is electrically connected to a grid electrode of the tenth field effect transistor S10, a drain electrode of the tenth field effect transistor S10 is used as a second input end of the second linear voltage stabilizing module, a source electrode of the tenth field effect transistor S10 is used as an output end of the second linear voltage stabilizing module, the resistor R13, the resistor R14 and the three-terminal adjustable reference source M8 are sequentially and electrically connected between the source electrode of the tenth field effect transistor S10 and the grid electrode of the tenth field effect transistor S10, a reference electrode of the three-terminal adjustable reference source M8 is electrically connected between the resistor R13 and the resistor R14, and a connection point of an anode of the three-terminal adjustable reference source M8 and the resistor R14 is used as a grounding end of the second linear voltage stabilizing module;

the third linear voltage stabilizing module comprises a resistor R10, an eleventh field-effect tube S11, a resistor R12 and a three-terminal adjustable reference source M7, wherein a first end of the resistor R10 is used as a first input end of the third linear voltage stabilizing module, a second end of the resistor R10 is electrically connected to a grid electrode of the eleventh field-effect tube S11, a drain electrode of the eleventh field-effect tube S11 is used as a second input end of the third linear voltage stabilizing module, a source electrode of the eleventh field-effect tube S11 is used as an output end of the third linear voltage stabilizing module, the resistor R11, the resistor R12 and the three-terminal adjustable reference source M7 are sequentially and electrically connected between the source electrode of the eleventh field-effect tube S11 and the grid electrode of the eleventh field-effect tube S11, a reference electrode of the three-terminal adjustable reference source M7 is electrically connected between the resistor R11 and the resistor R12, and a connection point of the three-terminal adjustable reference source M7 and the resistor R12 are grounded and used as a grounding end of the third linear voltage stabilizing module.

9. The multi-output power supply of claim 1, further comprising an output voltage feedback module;

the output voltage feedback module is electrically connected between the output end of at least one path of the rectifying module and the input end of the resonant conversion module, so that the sampled power supply voltage at the output end of the rectifying module is fed back to the resonant conversion module.

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