TWI773487B - Power supply system - Google Patents

Abstract

A power supply system includes: first and second external path selection circuits configured to respectively control first and second powers at first and second nodes to be electrically connected to first and second system ports; and an internal path selection circuit configured to control a third power at a third node or a fourth power at a fourth node to be connected to at least one of a plurality of power conversion modules; the first, second external path selection circuits, the internal path selection circuit and the power conversion modules are configured to operably perform one of the following: (1) receives at least one external power from at least one of the first or second system port, so as to generate the third power at the third node and/or generate the fourth power at the fourth node; or (2) convert the power from a battery, so as to generate at least one corresponding output power at least one of the first or second system port.

Description

power supply system

The present invention relates to a power supply system, in particular, to a power supply system capable of simultaneously using a plurality of power conversion modules for power conversion.

FIG. 1 shows a prior art power supply system 100 . As shown in FIG. 1 , the power supply system 100 of the prior art includes a power conversion module 130 and a power conversion module 140 , one end of each of which is respectively coupled to the first system port 30 and the second system port 40 , each of which is The other end is commonly coupled to the system voltage VSYS. The power conversion modules 130 and 140 are respectively used for switching the inductors L1 and L2 for power conversion. The system voltage VSYS charges the battery 60 through the switch Qsbp, and the system voltage VSYS is also used to supply power to the system circuit 50 .

The disadvantage of this prior art is that the first system port 30 is only coupled to the power conversion module 130, and the second system port 40 is only coupled to the power conversion module 140, so only a single power conversion module can be used for power conversion . In the application of larger current, the prior art cannot meet the requirement of large current.

In view of this, the present invention proposes a new power supply system aiming at the above-mentioned shortcomings of the prior art.

In one aspect, the present invention provides a power supply system, comprising: a first external path selection circuit for controlling a first power supply on a first node to be electrically connected to a first system port or a second system connection port; a second external path selection circuit for controlling a second power supply on a second node to be electrically connected to the first system port (port) or the second system port; a plurality of power conversion modules, including a A first power conversion module and a second power conversion module, wherein each of the power conversion modules includes a conversion circuit and has a first input and output terminals and a second input and output terminals, wherein the conversion circuit is used for switching an inductor for bidirectional power conversion between the first input and output terminals and the second input and output terminals, wherein the first input and output terminals of the first power conversion module and the The first input and output terminals are respectively coupled to the first node and the second node; and an internal path selection circuit coupled to the plurality of conversion circuits of the complex power conversion module for controlling a third node The third power source is electrically connected to the conversion circuit of the first power conversion module or the conversion circuit of the second power conversion module, and is used to control a fourth power source on a fourth node to be electrically connected to the first power source the conversion circuit of the conversion module or the conversion circuit of the second power conversion module; wherein the third power source is coupled to a system circuit, the fourth power source is coupled to a battery; wherein the first external path selection circuit , the second external path selection circuit, the plurality of power conversion modules and the internal path selection circuit perform one of the following operation categories: (1) receive from at least one of the first system port or the second system port at least one external power source, and the third power source is generated at the third node to power the system circuit, and/or the fourth power source is generated at the fourth node to charge the battery; or (2) convert the battery The power is used to generate at least one output power corresponding to at least one of the first system port or the second system port.

In one embodiment, the first external path selection circuit, the second external path selection circuit, the complex power conversion module and the internal path selection circuit perform one of the following operation modes: (A) Input on a single port In the mode, the first external path selection circuit and the second external path selection circuit simultaneously receive an external power source from one of the first system port or the second system port, and control the external power source to be electrically connected to the a plurality of the first input and output terminals of a plurality of power conversion modules, wherein the plurality of the conversion circuits convert the external power source to generate the third power source at the third node, and/or generate the fourth power source at the fourth node; Or (B) in a single port parallel output mode, a plurality of the conversion circuits simultaneously convert the power of the battery to generate an output power in parallel with one of the first system port or the second system port.

In one embodiment, in the single port parallel output mode, an output current of the output power supply is constant.

In one embodiment, in the single port parallel output mode, the switching phases of the plurality of conversion circuits are interleaved with each other.

In one embodiment, each of the power conversion modules further includes an error amplifying circuit, wherein in the single-port parallel output mode, the plurality of the conversion circuits are jointly controlled by one error amplifying circuit in the plurality of the error amplifying circuits, The error amplifying circuit generates an error amplifying signal according to the difference between an electrical parameter of the output power and a reference signal, and is used to control the complex conversion circuit.

In one embodiment, the first external path selection circuit, the second external path selection circuit, the plurality of power conversion modules and the internal path selection circuit further perform one of the following operation modes: (C) at a plurality of ports In the input mode, the first system port and the second system port respectively receive a first external power supply and a second external power supply, and the first external path selection circuit and the second external path selection circuit control the first external path selection circuit The external power supply and the second external power supply are respectively electrically connected to the first input and output terminals of the first power conversion module and the first input and output terminals of the second power conversion module, wherein the conversion circuits respectively convert the the first external power supply and the second external power supply to generate the third power supply at the third node, and/or generate the fourth power supply at the fourth node; (D) in a parallel input mode of a plurality of ports, The first system port and the second system port simultaneously receive an external power source, and the first external path selection circuit and the second external path selection circuit control the external power source to be electrically connected to the first power conversion module The first input and output terminals and the first input and output terminals of the second power conversion module, wherein a plurality of the conversion circuits respectively convert the external power to generate the third power at the third node, and/or at the first Four nodes generate the fourth power supply; (E) in a multi-port bidirectional mode, one of the first system port or the second system port receives an external power supply, and the other one of them is connected The port generates an output power, wherein the first external path selection circuit and the second external path selection circuit control the external power source to be electrically connected from the connection port to the corresponding power conversion module to perform power conversion, and pass the internal The control of the path selection circuit generates the third power supply at the third node or the fourth power supply at the fourth node; wherein the internal path selection circuit controls the fourth power supply or the third power supply is electrically connected to the corresponding other a power conversion module for power conversion, and through the control of the first external path selection circuit and the second external path selection circuit to generate the output power at the corresponding other connection port; or (F) in a In the multiple-port multiple-output mode, the internal path selection circuit controls the fourth power source to be electrically connected to the corresponding power conversion module, so that the plurality of conversion circuits convert the power of the battery and pass the first external path selection circuit , the second external path selection circuit generates a first output power and a second output power at the first system connection port and the second system connection port respectively.

In one embodiment, a current of the first external power supply or a current of the second external power supply in operation mode (C), or a current of the external power supply in operation modes (D), (E) is a constant current.

In one embodiment, in the operation modes (C), (D), (E), the corresponding power conversion module operates in a bypass state, wherein some switches of the power conversion module are constantly turned on, and some switches Constant non-conduction, so as to electrically connect the constant current to the fourth node, and charge the battery in a constant current manner.

In one embodiment, each of the first external path selection circuit and the second external path selection circuit has a first terminal, a second terminal and a third terminal, and includes: a first switch coupled to the first terminal; between one end and the second end; a second switch coupled between the first end and the third end; wherein the first end, the second end and the first end of the first external path selection circuit The third end is respectively coupled to the first node, the first system port and the second system port; wherein the first end, the second end and the third end of the second external path selection circuit are respectively is coupled to the second node, the second system port and the first system port.

In one embodiment, each of the plurality of power conversion modules further includes a third input/output terminal and further includes: a third switch coupled to the second output/input terminal of the power conversion module and the third input/output terminal between the output and input terminals; wherein the second output input terminal and the third output input terminal of the first power conversion module are respectively coupled to the third node and the fourth node; wherein the second power conversion module The third output and input end of the 2 are coupled to the fourth node; wherein the internal path selection circuit includes a plurality of the third switches of the power conversion module.

In one embodiment, each of the plurality of power conversion modules further includes a first switching terminal and a second switching terminal, wherein the conversion circuit of each of the plurality of power conversion modules corresponds to a buck-boost switching converter and includes: a first upper bridge switch, coupled between the first input input terminal and the first switching terminal; a first lower bridge switch, coupled between the first switching terminal and a ground potential; a second upper bridge switch, coupled between the second input input terminal and the second switching terminal; and a second lower bridge switch, coupled between the second switching terminal and the ground potential; wherein the The conversion circuit of the first power conversion module is used for switching a first inductor, so as to perform bidirectional power conversion between the first input and output terminals of the first power conversion module and the second input and output terminals, wherein The first inductor is coupled between the first switching terminal and the second switching terminal of the first power conversion module; wherein the conversion circuit of the second power conversion module is used for switching a second inductor , to perform bidirectional power conversion between the first input and output terminals of the second power conversion module, wherein the second inductor is coupled to the first output of the second power conversion module between a switch terminal and the second switch terminal.

In one embodiment, the internal path selection circuit further includes a fourth switch coupled between the third node and a fifth node, wherein the fifth node is coupled to the second power conversion module The second input and output.

In one embodiment, the internal path selection circuit further includes a fourth switch coupled between the third node and a fifth node, wherein the fifth node is coupled to the second power conversion module The second I/O terminal, wherein in the operation mode (E), the second system port receives the external power, and when the first system port generates the output power, the fourth switch is controlled to be turned on , so that the second power conversion module supplies power to the system circuit through the fourth switch, and the second power conversion module passes through the third switch to charge the battery.

In one embodiment, the first power conversion module passes through the corresponding third switch to charge the battery, and/or the second power conversion module passes through the corresponding third switch to charge the battery.

In one embodiment, the battery supplies power to the system circuit through the third switch of the first power conversion module.

In one embodiment, the first system port and the second system port are USB PD compliant ports.

In one embodiment, each of the power conversion modules is integrated into an integrated circuit.

In one embodiment, the first external path selection circuit and the second external path selection circuit are integrated into an integrated circuit.

The advantages of the present invention are that the present invention can improve the conversion efficiency, maximize the utilization of multiple power conversion modules, individually control the charging current, and support the sharing of the charging current.

The following describes in detail with specific embodiments, when it is easier to understand the purpose, technical content, characteristics and effects of the present invention.

The drawings in the invention are schematic, mainly intended to represent the coupling relationship between the circuits and the relationship between the signal waveforms, and the circuits, signal waveforms and frequencies are not drawn to scale.

FIG. 2A is a block diagram illustrating a circuit diagram of a power supply system 200 according to an embodiment of the present invention. As shown in FIG. 2A , the power supply system 200 includes an external path selection circuit 210 , an external path selection circuit 220 , a plurality of power conversion modules, and an internal path selection circuit 250 . The external path selection circuit 210 is used to control the first power supply (corresponding to the first voltage V1 and/or the first current I1 ) on the first node N1 to be electrically connected to the first system port 30 or the second system port 40. In another embodiment, the external path selection circuit 210 can also optionally control the first power supply on the first node N1 not to be electrically connected to the first system port 30 and the second system port 40 .

The external path selection circuit 220 is used to control the second power source (corresponding to the second voltage V2 and/or the second current I2 ) on the second node N2 to be electrically connected to the first system port 30 or the second system port 40 . In another embodiment, the external path selection circuit 220 can also optionally control the second power supply on the second node N2 not to be electrically connected to the first system port 30 and the second system port 40 . Referring to FIG. 2B , in one embodiment, the plurality of power conversion modules include a power conversion module 230 and a power conversion module 240 . Each of the power conversion module 230 and the power conversion module 240 has a first I/O terminal 351 and a second I/O terminal 352 . The power conversion module 230 and the power conversion module 240 are used to switch the inductor L1 or L2 respectively to perform bidirectional power conversion between the corresponding first input and output terminals 351 and the second input and output terminals 352 . In other embodiments, the plurality of power conversion modules can also be used to switch other forms of energy storage elements, such as capacitors.

Please continue to refer to FIG. 2A , the internal path selection circuit 250 is coupled to the plurality of second I/O terminals 352 corresponding to the plurality of power conversion modules for controlling the third power supply on the third node N3 (corresponding to the third voltage V3 and/or or the third current I3) is electrically connected to the second I/O terminal 352 of the power conversion module 230 or the second I/O terminal 352 of the power conversion module 240, and is used to control the fourth power supply on the fourth node N4 (corresponding to The fourth voltage V4 and/or the fourth current I4) are electrically connected to the second input/output terminal 352 of the power conversion module 230 or the second input/output terminal 352 of the power conversion module 240 . The third power source is coupled to the system circuit 50 , and the fourth power source is coupled to the battery 60 .

The external path selection circuit 210 , the external path selection circuit 220 , the plurality of power conversion modules and the internal path selection circuit 250 perform one of the following operation categories: (1) from at least one of the first system port 30 or the second system port 40 One receives at least one external power source, generates a third power source at the third node N3 to power the system circuit 50, and/or generates a fourth power source at the fourth node N4 to charge the battery 60; or (2) converts the The power generates corresponding at least one output power (corresponding to the output voltage VOTG and/or the output current IOTG) in at least one of the first system port 30 or the second system port 40 .

In one embodiment, in the above-mentioned operation category (1), the system circuit 50 may only be powered by the third power source. In another embodiment, in the above-mentioned operation category (1), the battery 60 may be charged only by the fourth power source. In yet another embodiment, in the above operation category (1), the system circuit 50 may be powered by the third power source and the battery 60 may be charged by the fourth power source at the same time.

FIG. 2B is a schematic diagram showing a specific circuit of a power supply system 200 according to an embodiment of the present invention. In one embodiment, each of the external routing circuit 210 and the external routing circuit 220 has a first terminal, a second terminal, and a third terminal, and includes a switch Q1 and a switch Q2. The switch Q1 is coupled between the first end and the second end, and the switch Q2 is coupled between the first end and the third end. In one embodiment, the first end, the second end and the third end of the external path selection circuit 210 are respectively coupled to the first node N1 , the first system port 30 and the second system port 40 . The first end, the second end and the third end of the external path selection circuit 220 are respectively coupled to the second node N2 , the second system port 40 and the first system port 30 .

In one embodiment, the external path selection circuit 210 and the external path selection circuit 220 can be integrated into an integrated circuit.

FIG. 3 is a circuit diagram showing the external path selection circuit 210 and the switches Q1 and Q2 in the external path selection circuit 220 in the power supply system 200 according to an embodiment of the present invention. As shown in FIG. 3 , each of the switches Q1 and Q2 in the external path selection circuit 210 and the external path selection circuit 220 includes a first transistor Qsa and a second transistor Qsb connected in series with each other. The body diode Dsa of the first transistor Qsa and the body diode Dsb of the second transistor Qsb are inversely coupled to each other, so that the switches Q1 and Q2 are controlled by a control signal (such as DR1 or DR2 in FIG. 2B ) to be When not conducting, the body diodes Dsa and Dsb are prevented from generating forward conduction current.

Please continue to refer to FIG. 2B , each of the power conversion module 230 and the power conversion module 240 generates a control signal (DR1 and DR2 as shown in the figure) at the control terminal DRV to control the external path selection circuit 210 and the external path respectively The corresponding switches Q1 and Q2 in the selection circuit 220 are selected. Specifically, as shown in FIG. 2B , the power conversion module 230 generates a control signal DR1 to control the switches Q1 and Q2 in the external path selection circuit 210 , and the power conversion module 240 generates a control signal DR1 . The control signal DR2 is used to control the switches Q1 and Q2 in the external path selection circuit 220 .

As shown in FIG. 2B , each of the power conversion module 230 and the power conversion module 240 includes a conversion circuit 350 for switching the corresponding inductor L1 or L2 for power conversion, in one embodiment, as shown in FIG. 2B As shown, the conversion circuit 350 corresponds to a buck-boost switching converter. In other embodiments, the conversion circuit 350 may also correspond to other types of converters, such as a buck or boost switching converter. Each of the power conversion module 230 and the power conversion module 240 further has a first switching terminal 354 and a second switching terminal 355 . In this embodiment, the conversion circuit 350 of each of the power conversion module 230 and the power conversion module 240 includes a high-bridge switch QA, a low-bridge switch QB, a low-bridge switch QC, and a high-bridge switch QD. The upper bridge switch QA is coupled between the corresponding first I/O terminal 351 and the first switching terminal 354, and the lower bridge switch QB is coupled between the corresponding first switching terminal 354 and the ground potential. The upper bridge switch QD is coupled between the corresponding second input/output terminal 352 and the second switching terminal 355 , and the lower bridge switch QC is coupled between the corresponding second switching terminal 355 and the ground potential.

In this embodiment, the first I/O terminal 351 and the second I/O terminal 352 of the power conversion module 230 are respectively coupled to the first node N1 and the third node N3, and the inductor L1 is coupled to the power conversion module 230. between the first switching terminal 354 and the second switching terminal 355 . The first I/O terminal 351 and the second I/O terminal 352 of the power conversion module 240 are coupled to the second node N2 and the third node N3 respectively, and the inductor L2 is coupled to the first switching terminal 354 of the power conversion module 240 and the second switching terminal 355 .

The conversion circuit 350 of the power conversion module 230 is used for switching the inductor L1 to perform a connection between the first input/output terminal 351 and the second input/output terminal 352 of the power conversion module 230 (ie, the first node N1 and the third node N3 ). between), optional bidirectional power conversion.

The conversion circuit 350 of the power conversion module 240 is used to switch the inductor L2 for switching between the first input/output terminal 351 and the second input/output terminal 352 of the power conversion module 240 (ie the second node N2 and the third node N3 between), optional bidirectional power conversion.

In one embodiment, each of the power conversion module 230 and the power conversion module 240 further has a third I/O terminal 353 and further includes a switch QE, wherein the switch QE is coupled to the second I/O terminal 352 and the third I/O terminal 352. between the input and output terminals 353 . In one embodiment, the third I/O terminal 353 of the power conversion module 230 and the third I/O terminal 353 of the power conversion module 240 are both coupled to the fourth node N4.

In this embodiment, the internal path selection circuit 250 includes the switches QE of both the power conversion module 230 and the power conversion module 240 . In one embodiment, the switch QE controls the electrical connection relationship between the second I/O terminal 352 and the third I/O terminal 353 by, for example, a switching method or a linear control method. From one point of view, in this embodiment, the internal path selection circuit 250 has overlapping components with the power conversion module 230 and the power conversion module 240, respectively.

In one embodiment, the internal path selection circuit 250 further includes a switch QBP, which is coupled between the third node N3 and the fifth node N5 for controlling the electrical connection between the third node N3 and the fifth node N5 . In this embodiment, the fifth node N5 is coupled to the second input/output end 352 of the power conversion module 240 .

In one embodiment, the first system port 30 and the second system port 40 are, for example, ports conforming to the Universal Serial Bus Power Delivery Specification (USB PD). In one embodiment, each of the power conversion module 230 and the power conversion module 240 is integrated into an integrated circuit.

FIG. 4A is a schematic diagram showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention. In the single port input mode, the external path selection circuit 210 and the external path selection circuit 220 simultaneously receive the external power VTA from the first system port 30, and control the external power VTA to be electrically connected to the first node N1 and the second node N2 ( That is, the first input and output terminals 351 ) corresponding to the power conversion module 230 and the power conversion module 240 respectively. In this embodiment, the switch Q1 of the external path selection circuit 210 and the switch Q2 of the external path selection circuit 220 are turned on, and the switch Q2 of the external path selection circuit 210 and the switch Q1 of the external path selection circuit 220 are turned off.

In the single port input mode, the conversion circuits 350 of both the power conversion module 230 and the power conversion module 240 convert the external power VTA to generate a third power at the third node N3 to supply power to the system circuit 50, and/or Or the fourth power source is generated at the fourth node N4 to charge the battery 60 . In one embodiment, the power conversion module 230 charges the battery 60 through the corresponding switch QE. In one embodiment, the power conversion module 240 charges the battery 60 through the corresponding switch QE.

FIG. 4B is a schematic diagram showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention. In the single port input mode, the external path selection circuit 210 and the external path selection circuit 220 simultaneously receive the external power VTA from the second system port 40, and control the external power VTA to be electrically connected to the first node N1 and the second node N2 ( That is, the power conversion module 230 and the power conversion module 240 respectively correspond to the first input and output terminals 351 ). In this embodiment, the switch Q1 of the external path selection circuit 210 and the switch Q2 of the external path selection circuit 220 are turned off, and the switch Q2 of the external path selection circuit 210 and the switch Q1 of the external path selection circuit 220 are turned on. Other power conversion methods of this embodiment are the same as those of the embodiment of FIG. 4A .

FIG. 5A is a schematic diagram showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention. In the single port parallel output mode, through the control of the internal path selection circuit 250, the conversion circuit 350 of both the power conversion module 230 and the power conversion module 240 can simultaneously convert the power of the battery 60 to, for example, the first system port. 30 are connected in parallel to generate output power (corresponding to output voltage VOTG and/or output current IOTG). In this embodiment, the battery 60 can also supply power to the system circuit 50 through the switch QE of the power conversion module 230 . The switches QE of the power conversion module 230 and the power conversion module 240 are both turned on, so as to electrically connect the fourth node N4 to the conversion circuit 350 of the power conversion module 230 and the conversion circuit 350 of the power conversion module 240 , so as to Perform the aforementioned power conversion. In this embodiment, the switch Q1 of the external path selection circuit 210 and the switch Q2 of the external path selection circuit 220 are turned on, so that the first power generated by the power conversion module 230 and the second power generated by the power conversion module 240 are turned on. The power supply is electrically connected to the first system port 30 in parallel to generate the aforementioned output power. On the other hand, the switch Q2 of the external path selection circuit 210 and the switch Q1 of the external path selection circuit 220 are not turned on. In one embodiment, in the single-port parallel output mode, the output current IOTG of the output power supply is constant, which can be used to charge a constant current with a large amount of external current, or the output voltage VOTG of the output power supply is constant. In one embodiment, in the aforementioned single-port parallel output mode, the switching phases of the complex conversion circuits 350 of the power conversion module 230 and the power conversion module 240 are interleaved with each other, thereby achieving a smaller output voltage ripple. wave, output current ripple.

FIG. 5B is a schematic diagram showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention. This embodiment is similar to the embodiment in FIG. 5A , the difference lies in that, in this embodiment, the switch Q2 of the external path selection circuit 210 and the switch Q1 of the external path selection circuit 220 are turned on to convert the power generated by the power conversion module 230 The first power source and the second power source generated by the power conversion module 240 are electrically connected in parallel to the second system port 40 to generate the aforementioned output power. On the other hand, the switch Q1 of the external path selection circuit 210 and the external path selection circuit 220 The switch Q2 is not conducting.

FIG. 5C is a schematic diagram showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 5A , the difference is that each of the power conversion module 230 and the power conversion module 240 further includes an error amplifying circuit 356 . In the aforementioned single port parallel output mode, the conversion circuits 350 of both the power conversion module 230 and the power conversion module 240 are jointly controlled by one error amplification circuit 356 in the complex error amplification circuits 356 . The error amplifying circuit 356 generates an error amplifying signal EAO according to the difference between an electrical parameter of the output power (such as the output voltage VOTG or the output current IOTG) and the reference signal VREF, and is used to control both the power conversion module 230 and the power conversion module 240 . the conversion circuit 350 of the other. Specifically, in the embodiment of FIG. 5C , the conversion circuits 350 of the power conversion module 230 and the power conversion module 240 are jointly controlled by the error amplification circuit 356 of the power conversion module 230 . In other embodiments, they can also be jointly controlled by the error amplifier circuit 356 of the power conversion module 240 .

FIG. 6 is a schematic diagram showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention. In the multiple port input mode, the first system port 30 and the second system port 40 receive the external power VTA1 and the external power VTA2, respectively. The external path selection circuit 210 and the external path selection circuit 220 control the external power supply VTA1 and the external power supply VTA2 to be electrically connected to the first node N1 and the second node N2 (that is, the first node corresponding to the power conversion module 230 and the power conversion module 240 respectively). I/O 351). In this embodiment, the switch Q1 of the external path selection circuit 210 and the switch Q1 of the external path selection circuit 220 are turned on, and the switch Q2 of the external path selection circuit 210 and the switch Q2 of the external path selection circuit 220 are turned off.

Continuing to refer to FIG. 6 , in the multiple port input mode, the conversion circuits 350 of the power conversion module 230 and the power conversion module 240 respectively convert the external power VTA1 and the external power VTA2 to generate the third power at the third node N3 , and supply power to the system circuit 50 , and/or generate a fourth power source at the fourth node N4 to charge the battery 60 . In one embodiment, the power conversion module 230 charges the battery 60 through the corresponding switch QE. In one embodiment, the power conversion module 240 charges the battery 60 through the corresponding switch QE.

In one embodiment, the current of the external power supply VTA1 or the current of the external power supply VTA2 is a constant current. In this embodiment, the corresponding power conversion modules such as the power conversion module 230 and the power conversion module 240 can operate in a bypass mode. In the state, in one embodiment, the upper bridge switches QA and QD of the power conversion module operating in the bypass state are always turned on, and the lower bridge switches QB and QC are always turned off, so as to electrically connect the constant current to the fourth node N4 , thereby charging the battery 60 in a constant current manner.

FIG. 7 is a schematic diagram showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention. In the multiple-port parallel input mode, the first system port 30 and the second system port 40 simultaneously receive the external power VTA, such as a high-power adapter (e.g. USB PD) simultaneously supplying two ports. The external path selection circuit 210 and the external path selection circuit 220 control the external power supply VTA to be electrically connected to the first node N1 and the second node N2 (ie, the power conversion module 230 ) through the first system port 30 and the second system port 40 at the same time. and the corresponding first input and output terminals 351 of the power conversion module 240). In this embodiment, the switches Q1 and Q2 of the external path selection circuit 210 and the switches Q1 and Q2 of the external path selection circuit 220 can both be turned on, so as to effectively reduce the parasitic resistance on the power path.

Continuing to refer to FIG. 7 , in the multiple-port parallel input mode, the conversion circuits 350 of the power conversion module 230 and the power conversion module 240 respectively convert the external power VTA to generate the third power at the third node N3, and the The system circuit 50 supplies power and/or generates a fourth power source at the fourth node N4 to charge the battery 60 . In one embodiment, the power conversion module 230 charges the battery 60 through the corresponding switch QE. In one embodiment, the power conversion module 240 charges the battery 60 through the corresponding switch QE.

In one embodiment, the current of the external power supply VTA is a constant current. In this embodiment, the power conversion module 230 and the power conversion module 240 can operate in a bypass state. The upper bridge switches QA and QD in the group 230 and the power conversion module 240 are always turned on, and the lower bridge switches QB and QC are always turned off, so as to electrically connect the constant current to the fourth node N4, thereby charging the battery 60 in a constant current manner .

FIG. 8A is a schematic diagram showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention. In one embodiment, the power supply system 200 receives the external power VTA through the first system port 30 and generates output power (corresponding to the output voltage VOTG and/or the output current IOTG) at the second system port 40 . In this embodiment, the switch Q1 of the external path selection circuit 210 and the switch Q1 of the external path selection circuit 220 are turned on, and the switch Q2 of the external path selection circuit 210 and the switch Q2 of the external path selection circuit 220 are turned off, so that the A system port 30 is electrically connected to the external power supply VTA to the first node N1 , and the second node N2 is electrically connected to the output power through the second system port 40 .

Continuing to refer to FIG. 8A , in one embodiment, the external path selection circuit 210 and the external path selection circuit 220 control the external power VTA to be electrically connected from the first system port 30 to the corresponding power conversion module 230 to perform power conversion, and through The control of the internal path selection circuit 250 generates a third power supply at the third node N3 to supply power to the system circuit 50 . In this embodiment, the power conversion module 230 can also charge the battery 60 through the corresponding switch QE.

Continuing to refer to FIG. 8A , the internal path selection circuit 250 controls the fourth power supply provided by the battery 60 to be electrically connected to the corresponding power conversion module 240 to perform power conversion, and is controlled by the external path selection circuit 210 and the external path selection circuit 220 . The output power (corresponding to the output voltage VOTG and/or the output current IOTG) is generated at the corresponding second system port 40 . In one embodiment, the switch QE of the power conversion module 240 is turned on to electrically connect the fourth node N4 to the conversion circuit 350 of the power conversion module 240 .

In one embodiment, the current of the external power supply VTA is a constant current. In this embodiment, the corresponding power conversion module such as the power conversion module 230 can be operated in a bypass state. QB and QC are always off, so as to electrically connect the constant current to the fourth node N4 to charge the battery 60 in a constant current manner.

FIG. 8B is a schematic diagram showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention. In a multi-port bidirectional mode, the second system port 40 receives the external power VTA and generates output power at the first system port 30 . The external path selection circuit 210 and the external path selection circuit 220 control the external power supply VTA to be electrically connected from the second system port 40 to the second node N2, and then the corresponding power conversion module 240 performs power conversion, and passes through the internal path selection circuit 250. The control generates a fourth power source at the fourth node N4 to charge the battery 60, and/or generates a fifth power source (corresponding to the fifth voltage V5 and/or the fifth current I5) at the fifth node N5, which is used for the system Circuit 50 is powered. In this embodiment, the switch QBP and the switch QE of the power conversion module 240 are controlled to be turned on, so that the power conversion module 240 supplies power to the system circuit 50 through the switch QBP, and the power conversion module 240 supplies power to the battery 60 through the switch QE. Charge. The switch QBP is controlled to be turned on, so as to electrically connect the fifth node N5 to the third node N3 , thereby supplying power to the system circuit 50 and electrically connecting to the converting circuit 350 of the power converting module 230 . It is worth noting that in other modes, the switch QBP can be turned off. The internal path selection circuit 250 controls the third power source to be electrically connected to the corresponding power conversion module 230 for power conversion, and is generated in the corresponding first system port 30 through the control of the external path selection circuit 210 and the external path selection circuit 220 For the output power (corresponding to the output voltage VOTG and/or the output current IOTG), in this embodiment, the switch QE of the power conversion module 230 may be turned off, for example.

Continue to refer to FIG. 8B , in this embodiment, specifically, the switch Q1 of the external path selection circuit 210 and the switch Q1 of the external path selection circuit 220 are turned on, the switch Q2 of the external path selection circuit 210 and the switch Q2 of the external path selection circuit 220 are turned on. Switch Q2 is non-conductive.

Continuing to refer to FIG. 8B , in one embodiment, the current of the external power supply VTA is a constant current. In this embodiment, the corresponding power conversion module such as the power conversion module 240 can be operated in a bypass state, wherein the upper bridge switches QA and QD of the power conversion module 240 are always turned on, and the lower bridge switches QB and QC are always turned off. It is turned on to electrically connect the constant current to the fourth node N4 to charge the battery 60 in a constant current manner.

FIG. 9 is a schematic diagram showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention. As shown in FIG. 9 , in the multiple-port multiple-output mode, the internal path selection circuit 250 controls the fourth power supply to be electrically connected to the corresponding power conversion module 230 and the power conversion module 240, so that the power conversion module 230 and the power supply The conversion circuits 350 of the conversion modules 240 convert the power of the battery 60, and generate the first output power at the first system port 30 and the second system port 40 through the external path selection circuit 210 and the external path selection circuit 220, respectively (for example, corresponding to the output voltage VOTG1) and a second output power source (for example, corresponding to the output voltage VOTG2). On the other hand, the battery 60 can also supply power to the system circuit 50 through the switch QE of the power conversion module 230 . In this embodiment, the switches QE of both the power conversion module 230 and the power conversion module 240 are turned on, so as to electrically connect the fourth node N4 (ie, the power provided by the battery 60 ) to the conversion of the power conversion module 230 The circuit 350 and the conversion circuit 350 of the power conversion module 240 . In this embodiment, the switch Q1 of the external path selection circuit 210 and the switch Q1 of the external path selection circuit 220 are turned on, and the switch Q2 of the external path selection circuit 210 and the switch Q2 of the external path selection circuit 220 are turned off.

FIG. 10 is a graph showing the efficiency of a single power conversion module of a power supply system versus load current according to an embodiment of the present invention. As shown in Figure 10, the efficiency of a single power conversion module has the maximum conversion efficiency at a specific current (eg 2A). Since the prior art can only perform power conversion with a single power conversion module, under the condition of a large current, Compared with the prior art, the power supply system 200 of the present invention can be configured with a plurality of power conversion modules to operate at operating points with better conversion efficiency (for example, under the application of larger current) lower current) to perform power conversion together, so that the power supply system 200 of the present invention can obtain higher conversion efficiency.

The present invention provides a power supply system as described above, which can simultaneously use a plurality of power conversion modules to perform power conversion of multiple paths and multiple modes through the first external path selection circuit, the second external path selection circuit and the internal path selection circuit, In addition, it can control the charging current individually, support shared charging current or parallel power supply, etc., which has many advantages such as improving the conversion efficiency and maximizing the utilization of multiple power conversion modules.

The present invention has been described above with respect to the preferred embodiments, but the above descriptions are only intended to make the content of the present invention easy for those skilled in the art to understand, and are not intended to limit the broadest scope of rights of the present invention. The described embodiments are not limited to be used alone, but can also be used in combination. For example, two or more embodiments can be used in combination, and some components in one embodiment can also be used to replace those in another embodiment. corresponding components. In addition, under the same spirit of the present invention, those skilled in the art can think of various equivalent changes and various combinations. According to the signal itself, when necessary, the signal is subjected to voltage-to-current conversion, current-to-voltage conversion, and/or ratio conversion, etc., and then processed or calculated according to the converted signal to generate an output result. It can be seen from this that under the same spirit of the present invention, those skilled in the art can think of various equivalent changes and various combinations, and there are many combinations, which are not listed and described here. Accordingly, the scope of the present invention should cover the above and all other equivalent changes.

30: The first system port 40: Second system port 50: System circuit 60: battery 200: Power Supply System 210, 220: External Path Selection Circuits 230,240: Power conversion module 250: Internal path selection circuit 350: Conversion circuit 351: the first input and output 352: the second input and output 353: the third input and output 354: first switching terminal 355: Second switching terminal 356: Error amplifier circuit Dsa, Dsb: body diode DR1, DR2: Control signal DRV: control terminal EAO: Error Amplified Signal I1: the first current I2: second current I3: The third current I4: Fourth current I5: Fifth current IOTG: output current L1, L2: Inductors N1: the first node N2: second node N3: The third node N4: Fourth Node N5: Fifth node Q1, Q2, QBP, QE, Qsbp: switch Qsa: first transistor Qsb: Second transistor QA,QD: high bridge switch QB,QC: lower bridge switch V1: first voltage V2: The second voltage V3: the third voltage V4: Fourth voltage V5: Fifth voltage VOTG, VOTG1, VOTG2: output voltage VREF: reference signal VTA, VTA1, VTA2: External power supply

FIG. 1 shows a prior art power supply system.

FIG. 2A is a circuit block diagram showing a power supply system according to an embodiment of the present invention.

FIG. 2B is a schematic diagram showing a specific circuit of a power supply system according to an embodiment of the present invention.

FIG. 3 is a schematic circuit diagram showing a plurality of switches in a first external path selection circuit and a second external path selection circuit in a power supply system according to an embodiment of the present invention.

4A and 4B are schematic diagrams showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention.

5A-5C are schematic diagrams showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention.

6 and 7 are schematic diagrams showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention.

8A and 8B are schematic diagrams showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention.

FIG. 9 is a schematic diagram showing a specific embodiment and operation of a power supply system according to an embodiment of the present invention.

FIG. 10 is a graph showing the efficiency of a single power conversion module of a power supply system versus load current according to an embodiment of the present invention.

30: The first system port

40: Second system port

50: System circuit

60: battery

200: Power Supply System

210, 220: External Path Selection Circuits

230,240: Power conversion module

250: Internal path selection circuit

350: Conversion circuit

351: the first input and output

352: the second input and output

353: the third input and output

354: first switching terminal

355: Second switching terminal

DRV: control terminal

DR1, DR2: Control signal

I1: the first current

I2: second current

I3: The third current

I4: Fourth current

L1, L2: Inductors

N1: the first node

N2: second node

N3: The third node

N4: Fourth Node

N5: Fifth node

Q1, Q2, QBP, QE: switch

QA,QD: high bridge switch

QB,QC: lower bridge switch

V1: first voltage

V2: The second voltage

V3: the third voltage

V4: Fourth voltage

Claims (18)

A power supply system comprising: a first external path selection circuit for controlling a first power supply on a first node to be electrically connected to a first system port or a second system port; a second external path selection circuit for controlling a second power supply on a second node to be electrically connected to the first system port or the second system port; A plurality of power conversion modules, including a first power conversion module and a second power conversion module, wherein each of the power conversion modules includes a conversion circuit and has a first input and output terminals and a second input and output terminals , wherein the conversion circuit is used to switch an inductor to perform bidirectional power conversion between the first input and output terminals, wherein the first input and output terminals of the first power conversion module are connected to the The first input and output terminals of the second power conversion module are respectively coupled to the first node and the second node; and an internal path selection circuit, coupled to the plurality of conversion circuits of the plurality of power conversion modules, for controlling a third power source on a third node to be electrically connected to the conversion circuit or the first power conversion module of the first power conversion module The conversion circuit of two power conversion modules is used to control a fourth power source on a fourth node to be electrically connected to the conversion circuit of the first power conversion module or the conversion circuit of the second power conversion module; wherein the third power source is coupled to a system circuit, and the fourth power source is coupled to a battery; Wherein the first external path selection circuit, the second external path selection circuit, the complex power conversion module and the internal path selection circuit perform one of the following operation categories: (1) receiving at least one external power supply from at least one of the first system port or the second system port, and generating the third power supply at the third node to supply power to the system circuit, and/or at the the fourth node generates the fourth power source to charge the battery; or (2) Converting the power of the battery to generate at least one output power corresponding to at least one of the first system port or the second system port. The power supply system of claim 1, wherein the first external path selection circuit, the second external path selection circuit, the complex power conversion module and the internal path selection circuit perform one of the following operation modes: (A) in a single port input mode, the first external routing circuit and the second external routing circuit simultaneously receive an external power source from one of the first system port or the second system port, and controlling the external power source to be electrically connected to a plurality of the first input and output terminals of the plurality of power conversion modules, wherein a plurality of the conversion circuits convert the external power source to generate the third power source at the third node, and/or at the the fourth node generates the fourth power source; or (B) In a single port parallel output mode, a plurality of the conversion circuits simultaneously convert the power of the battery to generate an output power in parallel with one of the first system port or the second system port. The power supply system of claim 2, wherein in the single port parallel output mode, an output current of the output power supply is constant. The power supply system of claim 2, wherein in the single-port parallel output mode, the switching phases of the plurality of conversion circuits are interleaved with each other. The power supply system of claim 2, wherein each of the power conversion modules further includes an error amplifier circuit, wherein in the single-port parallel output mode, the plurality of conversion circuits are jointly subjected to the plurality of error amplifier circuits. An error amplifying circuit is controlled, wherein the error amplifying circuit generates an error amplifying signal according to the difference between an electrical parameter of the output power and a reference signal, and is used to control the complex conversion circuit. The power supply system of claim 2, wherein the first external path selection circuit, the second external path selection circuit, the plurality of power conversion modules and the internal path selection circuit further perform one of the following operation modes: (C) In a multiple port input mode, the first system port and the second system port receive a first external power supply and a second external power supply, respectively, the first external path selection circuit and the second external power supply The external path selection circuit controls the first external power source and the second external power source to be electrically connected to the first input and output terminals of the first power conversion module and the first input and output terminals of the second power conversion module, respectively, wherein a plurality of the conversion circuits respectively convert the first external power source and the second external power source to generate the third power source at the third node, and/or generate the fourth power source at the fourth node; (D) In a multiple-port parallel input mode, the first system port and the second system port simultaneously receive an external power supply, and the first external path selection circuit and the second external path selection circuit control the external power The power supply is electrically connected to the first input and output terminals of the first power conversion module and the first input and output terminals of the second power conversion module, wherein a plurality of the conversion circuits respectively convert the external power supply to the third power conversion module. generating the third power supply at a node, and/or generating the fourth power supply at the fourth node; (E) In a multi-port bidirectional mode, one of the first system port or the second system port receives an external power source and generates an output power at the other port, wherein the The first external path selection circuit and the second external path selection circuit control the external power source to be electrically connected to the corresponding power conversion module from the connection port to perform power conversion, and are controlled by the internal path selection circuit to perform power conversion on the external power source. The third node generates the third power source or generates the fourth power source at the fourth node; The internal path selection circuit controls the fourth power source or the third power source to be electrically connected to another corresponding power conversion module to perform power conversion, and the first external path selection circuit and the second external path selection circuit are used for power conversion. to generate the output power at the corresponding other port; or (F) In a complex output mode of a plurality of ports, the internal path selection circuit controls the fourth power source to be electrically connected to the corresponding power conversion module, so that the plurality of conversion circuits convert the power of the battery, and the power of the battery is passed through the fourth power source. An external path selection circuit and the second external path selection circuit generate a first output power and a second output power at the first system port and the second system port, respectively. The power supply system of claim 6, wherein a current of the first external power supply or a current of the second external power supply in the operation mode (C), or in the operation modes (D), (E) A current of the external power source is a constant current. The power supply system of claim 7, wherein in the operation modes (C), (D), (E), the corresponding power conversion module operates in a bypass state, wherein part of the power conversion module The switches are always turned on, and some switches are always turned off, so as to electrically connect the constant current to the fourth node and charge the battery in a constant current manner. The power supply system of any one of claim 2 or 6, wherein each of the first external path selection circuit and the second external path selection circuit has a first terminal, a second terminal and a third terminal, and include: a first switch coupled between the first end and the second end; and a second switch, coupled between the first end and the third end; wherein the first end, the second end and the third end of the first external path selection circuit are respectively coupled to the first node, the first system port and the second system port; The first end, the second end and the third end of the second external path selection circuit are respectively coupled to the second node, the second system port and the first system port. The power supply system according to any one of claim 2 or 6, wherein each of the plurality of power conversion modules further has a third output and input terminal and further comprises: a third switch, coupled between the second I/O and the third I/O of the power conversion module; Wherein the second input-output terminal and the third output-input terminal of the first power conversion module are respectively coupled to the third node and the fourth node; wherein the third output and input end of the second power conversion module is coupled to the fourth node; Wherein the internal path selection circuit includes a plurality of the third switches of the power conversion module. The power supply system according to any one of claim 2 or 6, wherein each of the plurality of power conversion modules further comprises a first switching terminal and a second switching terminal, wherein each of the plurality of power conversion modules has a The conversion circuit corresponds to a buck-boost switching converter and includes: a first high-bridge switch, coupled between the first input and output terminals and the first switching terminal; a first lower bridge switch, coupled between the first switching terminal and a ground potential; a second high-bridge switch, coupled between the second input terminal and the second switching terminal; and a second lower bridge switch, coupled between the second switching terminal and the ground potential; The conversion circuit of the first power conversion module is used to switch a first inductor to perform bidirectional power conversion between the first input and output terminals of the first power conversion module , wherein the first inductor is coupled between the first switching terminal and the second switching terminal of the first power conversion module; The conversion circuit of the second power conversion module is used to switch a second inductor to perform bidirectional power conversion between the first input and output terminals of the second power conversion module , wherein the second inductor is coupled between the first switching terminal and the second switching terminal of the second power conversion module. The power supply system of claim 6, wherein the internal path selection circuit further comprises a fourth switch coupled between the third node and a fifth node, wherein the fifth node is coupled to the second The second output and input end of the power conversion module. The power supply system of claim 10, wherein the internal path selection circuit further comprises a fourth switch coupled between the third node and a fifth node, wherein the fifth node is coupled to the second The second input/output terminal of the power conversion module, wherein in the operation mode (E), the external power is received at the second system port, and the first system port generates the output power, the The fourth switch is controlled to be turned on, so that the second power conversion module supplies power to the system circuit through the fourth switch, and the second power conversion module charges the battery through the third switch. The power supply system of claim 10, wherein the first power conversion module passes through the corresponding third switch to charge the battery, and/or the second power conversion module passes through the corresponding third switch to charge the battery Charge the battery. The power supply system of claim 10, wherein the battery supplies power to the system circuit through the third switch of the first power conversion module. The power supply system of claim 1, wherein the first system connection port and the second system connection port are connection ports conforming to the Universal Serial Bus Power Delivery Specification (USB PD). The power supply system of claim 1, wherein each of the power conversion modules is integrated into an integrated circuit. The power supply system of claim 9, wherein the first external path selection circuit and the second external path selection circuit are integrated into an integrated circuit.

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