CN111769744A - Multi-output power supply system and power supply method - Google Patents

Multi-output power supply system and power supply method Download PDF

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Publication number
CN111769744A
CN111769744A CN202010710330.5A CN202010710330A CN111769744A CN 111769744 A CN111769744 A CN 111769744A CN 202010710330 A CN202010710330 A CN 202010710330A CN 111769744 A CN111769744 A CN 111769744A
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China
Prior art keywords
output
circuit
coupled
voltage
switch
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CN202010710330.5A
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Chinese (zh)
Inventor
俞秀峰
林官秋
胡燊刚
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Shenzhen Kiwi Microelectronic Co ltd
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Shenzhen Kiwi Microelectronic Co ltd
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Priority to CN202010710330.5A priority Critical patent/CN111769744A/en
Publication of CN111769744A publication Critical patent/CN111769744A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a multi-output power supply system and a multi-output power supply method. A multiple output power supply system comprising: the power conversion circuit, first output circuit and second output circuit. The first output circuit comprises a switch and a control circuit, wherein a first end of the switch is coupled with the power conversion circuit, a second end of the switch is used for providing a first output voltage, and a control end of the switch is coupled with the control circuit. The second output circuit is coupled to the power conversion circuit and is used for providing a second output voltage, wherein the second output voltage is used for supplying power to the control circuit. The multi-output power supply system and the multi-output power supply method provided by the invention can be used for providing multi-output power supplies for respectively controlling multi-output, and the system has a simple structure and higher efficiency.

Description

Multi-output power supply system and power supply method
Technical Field
The invention relates to the field of electronics, in particular to a multi-output power supply system and a power supply method.
Background
In an electronic power supply system, it is often necessary to provide different power supply sources for different loads in the system. One conventional method is to provide independent power supplies for different loads, but this method has a low integration level and a high system power cost. In order to improve the integration degree of a power supply system and reduce the cost of a power supply source, the requirement for a multi-output power supply system is provided.
In a conventional multi-output power supply system, a main circuit output and a sub circuit output are often arranged in a voltage conversion circuit system. The main path output is provided by a conventional voltage conversion topology. The output of the auxiliary circuit is provided with a low dropout linear voltage regulator (LDO) at the output end of the main circuit. However, in this method, the LDO has high power consumption and low system efficiency due to a large output current and a large difference between the auxiliary output voltage value and the main output voltage value.
In view of the above, there is a need to provide a new structure or control method to solve at least some of the above problems.
Disclosure of Invention
The invention provides a multi-output power supply system and a power supply method aiming at one or more problems in the prior art.
According to one aspect of the invention, a multiple output power supply system comprises: the power conversion circuit comprises a power device, and the power conversion circuit regulates output energy based on the state of the power device; the first output circuit comprises a switch and a control circuit, wherein the first end of the switch is coupled with the power conversion circuit, the second end of the switch is coupled with the first voltage output end and used for providing a first output voltage, and the control end of the switch is coupled with the control circuit; and the second output circuit is coupled with the power conversion circuit and used for providing a second output voltage at a second voltage output end, wherein the second output voltage is greater than the first output voltage, and the second voltage output end is coupled with the power supply end of the control circuit and used for supplying power to the control circuit.
In one embodiment, a power conversion circuit includes a flyback voltage conversion circuit, the flyback voltage conversion circuit including: a primary winding for receiving an input voltage; the power device is coupled with the primary winding; the first secondary winding is coupled with the primary winding and is coupled with the first end of the switch; and a second secondary winding coupled to the primary winding and to the second output circuit.
In one embodiment, the first output circuit further comprises a first rectifier tube coupled between the first secondary winding and the switch; the second output circuit comprises a second rectifying tube coupled with the second secondary winding and used for providing a second output voltage.
In one embodiment, the power conversion circuit comprises a flyback voltage conversion circuit, the flyback voltage conversion circuit comprising a primary winding for receiving an input voltage, a power device coupled to the primary winding, and a secondary winding coupled to the primary winding; the first output circuit further comprises a first rectifying tube, wherein the first end of the first rectifying tube is coupled with the secondary winding, and the second end of the first rectifying tube is coupled with the first end of the switch; the second output circuit comprises a second rectifying tube which is coupled with the secondary winding and used for providing a second output voltage.
In one embodiment, the power conversion circuit includes a switched buck circuit, the switched buck circuit including: the power device is used for receiving an input voltage, the rectifying device and the inductor, wherein the inductor is provided with a first end and a second end, and the first end of the inductor is coupled with the power device; the second output circuit comprises a second rectifying tube coupled to the second end of the inductor for providing a second output voltage.
In one embodiment, the control circuit comprises a low dropout linear circuit for converting the second output voltage into a supply voltage for powering the control circuit.
In one embodiment, the control circuit further comprises a loop control circuit that controls the switch based on the first output voltage.
In an embodiment, the multiple output power supply system as described in any of the above embodiments, further comprising a rectifying circuit, wherein an input of the rectifying circuit receives a commercial power ac power source, and an output of the rectifying circuit is coupled to an input terminal of the power conversion circuit.
According to another aspect of the invention, a method for providing power in multiple outputs comprises: providing energy for the multiplexed output based on the input power source and control of the power device; the switch is connected with the first path output end in series; the control circuit is adopted to control the on and off of the switch; and the output voltage of the second output end is adopted to supply power for the control circuit.
The multi-output power supply system and the power supply method provided by the invention can be used for providing a multi-output power supply for respectively controlling the multi-output, and the system has a simple structure and higher efficiency.
Drawings
FIG. 1 shows a block diagram of a multiple output power supply system according to an embodiment of the invention;
FIG. 2 is a circuit diagram of a multi-output power supply system including a flyback voltage converter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a multi-output power supply system with a flyback voltage converter circuit according to another topology of the present invention;
fig. 4 is a circuit diagram of a multi-output power supply system including a switched buck circuit according to another embodiment of the present invention.
Fig. 5 is a flow chart of a method for supplying power to multiple outputs according to an embodiment of the present invention.
The same reference numbers in different drawings identify the same or similar elements or components.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. Combinations of different embodiments, and substitutions of features from different embodiments, or similar prior art means may be substituted for or substituted for features of the embodiments shown and described.
The term "coupled" or "connected" in this specification includes both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as a conductor, wherein the electrically conductive medium may contain parasitic inductance or parasitic capacitance, or through an intermediate circuit or component as described in the embodiments in the specification; indirect connections may also include connections through other active or passive devices that perform the same or similar function, such as connections through circuits or components such as signal amplification circuits, follower circuits, etc. "plurality" or "plurality" means two or more.
Fig. 1 shows a multiple output power supply system according to an embodiment of the invention. The multi-output power supply system includes a power conversion circuit 11, a first output circuit 12, and a second output circuit 13, wherein the power conversion circuit 11 includes a power device Q, and the power conversion circuit 11 adjusts output energy for distribution to the multi-outputs based on a state of the power device Q. The multiplexed output comprises a first output circuit 12 and a second output circuit 13 for powering a first load and a second load, respectively. The first output circuit 12 includes a switch K and a control circuit 120, a first terminal of the switch K is coupled to the power conversion circuit 11, a second terminal of the switch K is coupled to the first voltage output terminal OUT1 for providing the first output voltage Vout1, and a control terminal of the switch K is coupled to the control circuit 120, and the control circuit 120 controls the switch K to control the energy delivered to the first voltage output terminal OUT1 so as to control the corresponding output voltage. The second output circuit 13 is also coupled to the power conversion circuit 11 for providing a second output voltage Vout2 at a second voltage output terminal OUT2, wherein the second output voltage Vout2 is greater than the first output voltage Vout 1. The second voltage output terminal OUT2 is coupled to the power supply terminal VDD of the control circuit 120 for supplying power to the control circuit 120 by using the second output voltage Vout 2.
Preferably, the second output voltage Vout2 is regulated by control of the power device Q based on a feedback signal indicative of the second output voltage Vout2, and the first output voltage Vout1 is regulated by control of the switch K based on a feedback signal indicative of the first output voltage Vout 1. In one embodiment, the second output voltage Vout2 is regulated by a secondary side control technique (SSR) that feeds a feedback signal indicative of the second output voltage Vout2 back to the primary side control circuit. In this way, precise regulation and control of the first output voltage Vout1 and the second output voltage Vout2 can be achieved simultaneously. The system can provide energy for two or more paths of output through one power device Q without adopting an additional power conversion circuit with higher complexity or a power conversion circuit with higher power consumption.
In another embodiment, the multiple output power supply system may further have more output circuits, wherein the output terminals of the output circuits are connected in series with corresponding switches, and the corresponding output voltages are adjusted by the states of the switches. For example, the multi-output power supply system further includes a third output circuit including a third switch for regulating a third output voltage, and a control circuit of the third switch may be coupled to the second voltage output terminal OUT2 to supply power to the control circuit. The supply terminal of the control circuit of the third switch may also be coupled to the first voltage output terminal OUT1 to supply the control circuit with the first output voltage Vout1, wherein the output voltage of the third switch is lower than the first output voltage Vout 1.
Since the second output voltage Vout2 providing the power supply for the control circuit 120 is greater than the first output voltage Vout1, the second output voltage Vout2 is used to power the control circuit 120, and the switch K is reliably driven. The second output voltage Vout2 has a lower voltage value than the bus voltage, and the second output voltage Vout2 can be used to directly supply power to the control circuit 120 when the power supply is performed, so that the system loss is low and the efficiency is high. In one embodiment, the second output voltage is 12 volts, the first output voltage is 5 volts, and the second output voltage can be directly used to power the control circuit 120. Through the control, the control circuit does not need an additional power supply, the system complexity is reduced, and the power supply efficiency is improved. In another embodiment, the control circuit includes a low dropout regulation (LDO) circuit for converting the second output voltage Vout2 to a supply voltage for a further control circuit, but the system loss is low due to the low second output voltage Vout2 relative to the bus voltage and the low operating current of the control circuit.
Fig. 2 shows a multiple output power supply system according to an embodiment of the invention. The multi-output power supply system includes a rectifier circuit 20, a power conversion circuit 21, a first output circuit 22, and a second output circuit 23. Wherein the power conversion circuit includes flyback voltage conversion circuit 21, flyback voltage conversion circuit 21 includes: a primary winding L1 for receiving an input voltage Vin; the power device Q is coupled with the primary winding L1, and can control the energy output to the secondary side by controlling the on and off of the power device Q1; a first secondary winding L2 coupled to the primary winding L1, wherein the first secondary winding L2 is coupled to the first output circuit 22, specifically to a first terminal of a switch K, and a second terminal of the switch K is coupled to a first voltage output terminal OUT1, for providing a first output voltage Vout 1; and a second secondary winding L3 coupled to the primary winding L1, the second secondary winding L3 being coupled to the second output circuit 23. In another embodiment, the switch K may also be coupled between the secondary side reference ground and the other end of the first secondary winding L2, when the second end of the switch is coupled to the secondary side reference ground, i.e., the low-side voltage output terminal of the first output voltage Vout 1.
The first output circuit 22 includes a first rectifier D1, a switch K, and a control circuit 220. The supply terminal VDD of the control circuit 220 is coupled to the second voltage output terminal, and the second output voltage Vout2 is utilized to supply power to the control circuit 220 in the first output circuit 22. The first rectifier tube D1 includes a diode coupled between the first secondary winding L2 and the first terminal of the switch K. The first rectifying tube D1 may also be a body diode of the switch K, that is, the first rectifying tube D1 and the switch K are fabricated in the same transistor. In one embodiment, switch K comprises a metal oxide semiconductor field effect transistor. Of course, the switch K may be other types of devices, such as a jfet. In further embodiments, the first output circuit 22 may not have a first rectifier, controlling the current through the switch K by controlling the on and off of the switch K for providing the first output voltage Vout 1.
The second output circuit 23 includes a second rectifier tube D2, and a second rectifier tube D2 is coupled between the second secondary winding L3 and the second voltage output terminal for providing a second output voltage Vout 2. In another embodiment, the second rectifier tube D2 may also be coupled to the other end of the second secondary winding L3 as a low-level rectifier tube. The second rectifier tube D2 is for freewheeling current through the second secondary winding L3 for providing a second output voltage Vout2 at the second voltage output terminal.
Of course, the first secondary winding L2 may also be considered part of the first output circuit. The second secondary winding L3 may be considered part of the second output circuit.
An input end of the rectifying circuit 20 is coupled to a mains power supply for receiving a mains alternating current Vac, and an output end of the rectifying circuit 20 is used for providing an input voltage Vin of the flyback voltage conversion circuit 21. The multi-output power supply system may further include a filter circuit at an output of the rectifying circuit 20 for smoothing the input voltage Vin. In other embodiments, the dc input voltage Vin may be provided by other power sources.
Fig. 3 shows a multiple output power supply system according to an embodiment of the invention, wherein the power conversion circuit includes a flyback voltage conversion circuit 31, and the flyback voltage conversion circuit 31 includes a primary winding L1 for receiving an input voltage Vin, a power device Q coupled to the primary winding L1, and a secondary winding L2 coupled to the primary winding L1. The secondary winding L2 is coupled to a first rectifying tube D1 and a switch K in series for providing a first output voltage Vout1, wherein a first end of the first rectifying tube D1 is coupled to the secondary winding L2, a second end of the first rectifying tube D2 is coupled to a first end of the switch K, and another end of the switch K is used for providing a first output voltage Vout 1. The secondary winding L2 is further coupled to a second rectifier D2 for providing a second output voltage Vout 2. In one embodiment, the second output voltage Vout2 achieves precise control of the second output voltage Vout2 by feeding a signal back to the primary circuit, such as by feeding an output signal back to the primary circuit through an optocoupler device, by controlling the power device Q, while the first output voltage Vout1 achieves precise control of Vout1 by feeding back to the control circuit 320 by controlling the switch K. The first output circuit 32 comprises a first rectifying tube D1, a switch K and a control circuit 320, wherein the control circuit 320 is coupled to the output terminal of the second output circuit 33 and is powered by a second output voltage Vout2 provided by the second voltage output terminal.
Fig. 4 shows a multiple output power supply system according to another embodiment of the invention. In this embodiment, the power conversion circuit includes a switching step-down circuit (Buck) 41. The switching step-down circuit 41 includes: the power device Q is used for receiving an input voltage Vin, the rectifying device D0 and an inductor L, wherein the inductor L has a first end and a second end, and the first end of the inductor L is coupled to the power device Q. The first output circuit 42 includes a switch K and a control circuit 420, wherein a first terminal of the switch K is coupled to the second terminal of the inductor L, and a second terminal of the switch K is coupled to the first voltage output terminal for providing the first output voltage Vout 1. Switch K is controlled by control circuit 420. The second output circuit includes a second rectifying tube D2, the second rectifying tube D2 is coupled to the second end of the inductor L for providing a second output voltage Vout2 at the second voltage output terminal. The second voltage output terminal of the second output circuit is coupled to the power supply terminal VDD of the control circuit 420, and the second output voltage Vout2 is used for supplying power to the control circuit 420.
In one embodiment, the second output voltage Vout2 provided by the second output circuit directly powers the control circuit 420 that controls the switch K.
In another embodiment, the control circuit 420 controlling the switch K comprises a low dropout linear circuit for converting the second output voltage Vout2 provided by the second output circuit into a supply voltage for supplying the control circuit 420.
In one embodiment, the control circuit controlling the switch K includes a loop control circuit that controls the switch K based on the first output voltage Vout1 provided by the first output circuit such that the first output voltage follows the reference signal. In one embodiment, the loop control circuit includes a comparison circuit for comparing a feedback signal indicative of the first output voltage with a reference signal to control the switching on and off of the switch K based on the comparison. In another embodiment, the loop control circuit comprises an error amplification circuit for error amplifying a difference between a feedback signal representing the first output voltage and a reference signal and controlling the switch K for making the first output voltage follow the reference signal based on the error amplified signal.
The input terminal of the power conversion circuit can be coupled to an input capacitor for stabilizing the input voltage. The output circuits of the first output circuit, the second output circuit and the like can be respectively coupled with an output capacitor at the output end thereof for stabilizing the output voltage thereof.
Fig. 5 is a schematic flow chart of a multi-output power supply method according to an embodiment of the present invention, the multi-output power supply method includes: in step 501, the multiplexed output is energized based on the input power and control of the power device. The power supply system includes a multiplexed output for supplying power to a plurality of loads. In step 502, a switch is coupled in series with the first output terminal for adjusting the energy output to the first output terminal based on the on and off of the switch, thereby adjusting the output voltage. In step 503, the switch is controlled to be turned on or off by the control circuit. In one embodiment, the control circuit controls the switch based on a feedback signal of the first output voltage at the first output terminal. In step 504, the second output voltage of the second output terminal is used to power the control circuit. In one embodiment, the second output voltage is regulated by feeding back and controlling the power device. Preferably, the second output voltage is higher than the first output voltage.
The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. The descriptions related to the effects or advantages in the specification may not be reflected in practical experimental examples due to uncertainty of specific condition parameters or influence of other factors, and the descriptions related to the effects or advantages are not used for limiting the scope of the invention. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.

Claims (9)

1. A multiple output power supply system comprising:
the power conversion circuit comprises a power device, and the power conversion circuit regulates output energy based on the state of the power device;
the first output circuit comprises a switch and a control circuit, wherein the first end of the switch is coupled with the power conversion circuit, the second end of the switch is coupled with the first voltage output end and used for providing a first output voltage, and the control end of the switch is coupled with the control circuit;
and the second output circuit is coupled with the power conversion circuit and used for providing a second output voltage at a second voltage output end, wherein the second output voltage is greater than the first output voltage, and the second voltage output end is coupled with the power supply end of the control circuit and used for supplying power to the control circuit.
2. The multiple output power supply system of claim 1, wherein the power conversion circuit comprises a flyback voltage conversion circuit, the flyback voltage conversion circuit comprising:
a primary winding for receiving an input voltage;
the power device is coupled with the primary winding;
the first secondary winding is coupled with the primary winding and is coupled with the first end of the switch; and
and the second secondary winding is coupled with the primary winding and the second output circuit.
3. The multi-output power supply system of claim 2 wherein the first output circuit further comprises a first rectifier coupled between the first secondary winding and the switch; the second output circuit comprises a second rectifying tube coupled with the second secondary winding and used for providing a second output voltage.
4. The multiple-output power supply system of claim 1, wherein the power conversion circuit comprises a flyback voltage conversion circuit, the flyback voltage conversion circuit comprising a primary winding for receiving the input voltage, a power device coupled to the primary winding, and a secondary winding coupled to the primary winding; the first output circuit further comprises a first rectifying tube, wherein the first end of the first rectifying tube is coupled with the secondary winding, and the second end of the first rectifying tube is coupled with the first end of the switch; the second output circuit comprises a second rectifying tube which is coupled with the secondary winding and used for providing a second output voltage.
5. The multi-output power supply system of claim 1 wherein the power conversion circuit includes a switched buck circuit, the switched buck circuit including: the power device is used for receiving an input voltage, the rectifying device and the inductor, wherein the inductor is provided with a first end and a second end, and the first end of the inductor is coupled with the power device; the second output circuit comprises a second rectifying tube coupled to the second end of the inductor for providing a second output voltage.
6. The multiple output power supply system of claim 1 wherein the control circuit includes a low dropout linear circuit for converting the second output voltage to a supply voltage for powering the control circuit.
7. The multi-output power supply system of claim 6 wherein the control circuit further comprises a loop control circuit that controls the switch based on the first output voltage.
8. A multiple output power supply system according to any of claims 1 to 7 further comprising a rectifying circuit, wherein an input of the rectifying circuit receives a mains AC supply and an output of the rectifying circuit is coupled to an input of the power conversion circuit.
9. A method of multi-output power supply, comprising:
providing energy for the multiplexed output based on the input power source and control of the power device;
the switch is connected with the first path output end in series;
the control circuit is adopted to control the on and off of the switch;
and the output voltage of the second output end is adopted to supply power for the control circuit.
CN202010710330.5A 2020-07-22 2020-07-22 Multi-output power supply system and power supply method Pending CN111769744A (en)

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CN112366952A (en) * 2020-11-13 2021-02-12 深圳市必易微电子股份有限公司 Isolated voltage conversion circuit, control circuit thereof and power supply method
CN112583275A (en) * 2020-10-14 2021-03-30 深圳市必易微电子股份有限公司 Flyback multi-output power supply system and control circuit and power supply method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112583275A (en) * 2020-10-14 2021-03-30 深圳市必易微电子股份有限公司 Flyback multi-output power supply system and control circuit and power supply method thereof
CN112583275B (en) * 2020-10-14 2023-02-17 深圳市必易微电子股份有限公司 Flyback multi-output power supply system and control circuit and power supply method thereof
CN112366952A (en) * 2020-11-13 2021-02-12 深圳市必易微电子股份有限公司 Isolated voltage conversion circuit, control circuit thereof and power supply method
CN112366952B (en) * 2020-11-13 2024-05-31 深圳市必易微电子股份有限公司 Isolated voltage conversion circuit, control circuit thereof and power supply method

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