Power supply with multiple output ports and associated control method

Abstract

The present application provides a power supply with multiple output ports, comprising an AC-DC power converter, a DC-DC power converter, and at least a switching circuit. The AC-DC power converter can generate a first relay power. The DC-DC power converter can generate a second relay power. The switching circuit is connected to the AC-DC power converter and the DC-DC power converter, and can selectively connect one of the first relay power and the second relay power to an output port as an output power.

Description

Technical Field

[0001] This invention relates to power supplies, and more particularly to power supplies having multiple output ports and related control methods. Background Technology

[0002] In the past, charging devices for various products were often handled by different brands using their own interfaces, leading to significant waste when devices were replaced. With the widespread adoption of Universal Serial Bus (USB), most products on the market transmit data through this interface, prompting a desire to improve USB power delivery capabilities.

[0003] In 2012, the USB-IF (USB Implementers Forum) released the first version of the USB Power Delivery specification (USB Power Delivery Specification Revision 1.0, Version 1.0), which significantly increased the power supply capability to a maximum of 100W (20V / 5A). With the improvement in power supply capability, charging devices began to emerge with multiple USB charging ports, allowing multiple products to be charged simultaneously.

[0004] Figure 1 The existing power supply 100, as a charging device, has two USB output ports, USB-C1 and USB-C2, which can provide output power VO1 and VO2 respectively to charge products connected to the USB output ports USB-C1 and USB-C2. An AC-to-DC converter 101 converts AC power VAC into relay power VA to power DC-to-DC converters 102A and 102B. DC-to-DC converters 102A and 102B provide output power VO1 and VO2 respectively through switches Q01 and Q02, based on the results of Power Deliver (PD) protocol communication from the USB output ports USB-C1 and USB-C2. As can be seen from the power supply 100, each output power VO1 and VO2 requires two power conversions, and each conversion incurs a certain conversion loss; therefore, the overall conversion efficiency of the power supply 100 is inevitably poor. Furthermore, the cost of two independent DC-to-DC converters 102A and 102B would be considerable.

[0005] Figure 2 The existing power supply 160 also features two USB output ports, USB-C1 and USB-C2, which can provide power outputs VO1 and VO2 respectively. Figure 1Unlike power supply 100, power supply 160 directly uses the relay power VA from AC-to-DC power converter 101 as output power VO2 via switch Q22, and also has a buck-boost power converter 104 to provide output power VO1 via switch Q21. At first glance, the architecture of power supply 160, compared to... Figure 1 The power supply 100 is relatively simple. However, in the power supply 160, if the output voltage of the output power supply VO2 is much lower than the output voltage of the output power supply VO1, the AC to DC power converter 101 will suffer very large current losses, greatly reducing the overall conversion efficiency of the power supply 160. Summary of the Invention

[0006] This invention provides a power supply with multiple output ports, comprising an AC-to-DC power converter, a DC-to-DC power converter, and at least one switching circuit. The AC-to-DC power converter generates a first relay power supply. The DC-to-DC power converter generates a second relay power supply. The switching circuit is connected to the AC-to-DC power converter and the DC-to-DC power converter, and can selectively connect one of the first relay power supply and the second relay power supply to an output port as an output power supply.

[0007] This invention provides a control method applicable to a multi-output port power supply capable of outputting a first output power supply and a second output power supply. The first output power supply is regulated to an intermediate target voltage, between a first and a second target voltage. The power supply can selectively provide one of a first relay power supply and a second relay power supply as the first output power supply, or selectively provide one of the first relay power supply and the second relay power supply as the second output power supply. The control method includes the following steps: providing the first and second relay power supplies as the first and second output power supplies, respectively, and regulating the first and second relay power supplies to the intermediate target voltage and the first target voltage, respectively; regulating the first and second relay power supplies to the intermediate target voltage; providing the higher of the first and second relay power supplies as the first and second output power supplies; causing the first relay power supply to act as the second output power supply and the second relay power supply to act as the first output power supply; and regulating the first relay power supply to the second target voltage and the second relay power supply to the intermediate target voltage. Attached Figure Description

[0008] Figure 1 and Figure 2 Show two existing power supplies.

[0009] Figure 3 This shows a power supply 200 implemented according to the present invention.

[0010] Figure 4A , 4B Examples of 4C and 4D show four switches.

[0011] Figure 5A Display target voltage V O1-TAR It is 9V, while the target voltage V O2-TAR Some states experienced by power supply 200 when changing from 5V to 15V.

[0012] Figure 5B Display target voltage V O1-TAR It is 9V, while the target voltage V O2-TAR Some states experienced by power supply 200 when changing from 15V to 5V.

[0013] Figure 6 This shows a power supply 300 implemented according to the present invention.

[0014] The labels in the diagram are explained as follows:

[0015] 100V and 160V power supplies

[0016] 101 AC to DC power converter

[0017] 102A, 102B DC to DC power converters

[0018] 104 step-up / step-down power converter

[0019] 200 power supply

[0020] 202 AC to DC power converter

[0021] 204 DC to DC power converter

[0022] 206A and 206B switching circuit

[0023] 207 controller

[0024] 300 power supply

[0025] 302 AC to DC power converter

[0026] 304 DC to DC power converter

[0027] 306A / 306B switching circuit

[0028] 307 controller

[0029] CH1 and CH2 ends

[0030] CST1 and CST2 capacitors

[0031] D drain

[0032] G gate

[0033] NM1, NM21, NM22NMOS

[0034] PM1, PM21, PM22PMOS

[0035] Q01, Q02, Q21, Q22, QA1, QB1, QA2, QB2

[0036] switch

[0037] S source

[0038] SD0, SD1, SD2, SD3, SD4, SU0, SU1, SU2, SU3, SU4

[0039] state

[0040] Switches SW1, SW2, SW3, and SW4

[0041] USB-C1, USB-C2 USB output ports

[0042] VA relay power supply

[0043] VB, VB1, VB2 relay power supply

[0044] VAC power supply

[0045] VO1 and VO2 output power

[0046] V O1-TAR V O2-TAR Target voltage Detailed Implementation

[0047] To make the objectives, implementation methods, and advantages of the embodiments of the present invention clearer, the implementation methods in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The embodiments described in this specification are only some embodiments of the present invention, not all embodiments. Those skilled in the art can make various modifications and variations to the embodiments described in this specification without departing from the spirit and scope of the present invention.

[0048] Figure 3 The power supply 200 implemented according to the present invention has two USB output ports, USB-C1 and USB-C2, which can provide output power VO1 and VO2 respectively. The power supply 200 includes an AC to DC power converter 202, a DC to DC power converter 204, switching circuits 206A and 206B, and a controller 207.

[0049] Power supply 200 can enjoy high power conversion efficiency. By switching circuits 206A and 206B, output power supplies VO1 and VO2 can both be generated solely by AC-to-DC power converter 202 or DC-to-DC power converter 204. Power supply 200 will also not experience... Figure 2 The power supply unit 160 may face the problem of high current loss.

[0050] The AC-to-DC power converter 202 converts AC power VAC to generate relay power VA. For example, the AC-to-DC power converter 202 can be a flyback converter.

[0051] DC-to-DC power converter 204 converts relay power VA to provide relay power VB. For example, DC-to-DC power converter 204 can be, but is not limited to, a buck converter, so the voltage V of relay power VA... A The voltage V is approximately no lower than that of the relay power supply VB. B In another embodiment, the DC-to-DC power converter 204 can be a bidirectional buck-boost converter, so the voltage V A It may be greater than or less than the voltage V. B .

[0052] Switching circuit 206A has switches QA1 and QB1, and switching circuit 206B has switches QA2 and QB2. Taking switching circuit 206A as an example, switching circuit 206A is connected to AC-to-DC power converter 202 and DC-to-DC power converter 204. It can selectively connect either relay power supply VA or relay power supply VB to the USB output port USB-C1 as output power supply VO1. When switch QA1 is on, relay power supply VA serves as output power supply VO1; when switch QB1 is on, relay power supply VB serves as output power supply VO1. Moreover, when both switches QA1 and QB1 are on, the higher voltage of relay power supply VA and relay power supply VB will supply the lower voltage of the other. Similarly, switching circuit 206B can also selectively use either relay power supply VA or relay power supply VB as output power supply VO2.

[0053] Controller 207 controls AC-to-DC power converter 202, DC-to-DC power converter 204, and switching circuits 206A and 206B. For example, controller 207 controls AC-to-DC power converter 202 to ensure that the voltage V of relay power supply VA is... A The voltage is switched from 5V to 15V. Controller 207 controls switching circuit 206B to select relay power supply VA or VB as output power supply VO2.

[0054] The controller 207 can determine from the results of the Power Deliver (PD) protocol communication between the USB output ports USB-C1 and USB-C2 that the output power supplies VO1 and VO2 should be stabilized at the target voltage V. O1-TAR With V O2-TAR Based on this, the AC-to-DC power converter 202 and the DC-to-DC power converter 204 are controlled to change the voltage V. A With V B And switch the switches in switching circuits 206A and 206B as needed.

[0055] In one embodiment, controller 207 causes the relay power supply VA to be regulated at the target voltage V. O1-TAR With V O2-TAR The one with the higher voltage, while the relay power supply VB is controlled at the target voltage V. O1-TAR With V O2-TAR The lower-voltage one, switching circuit 206A, connects to the USB output port USB-C1 to voltage V. A With V B In, with the target voltage V O1-TAR The same one; the switching circuit 206B connects to the USB output port USB-C2 to voltage V. A With V B In, with the target voltage V O2-TAR The same one. If the target voltage V O1-TAR With V O2-TAR They are the same; the output power supplies VO1 and VO2 are directly powered by the relay power supply VA through switching circuits 206A and 206B.

[0056] For example, the DC-to-DC power converter 204 is a step-down converter. The controller 207 knows that the output power supplies VO1 and VO2 should be stabilized at 9V and 15V respectively, which is the target voltage V. O1-TAR With V O2-TAR The voltages are 9V and 15V respectively. The controller 207 uses this voltage to ultimately set the voltage V... A With V B The voltages are 15V and 9V respectively, and switches QA1, QB1, QA2, and QB2 are in the states of non-conducting, conducting, conducting, and non-conducting, respectively. Therefore, the AC-to-DC power converter 202 regulates the output power VO2 to 15V, while the DC-to-DC power converter 204 regulates the output power VO1 to 9V.

[0057] Figures 4A-4C For example, four switches SW1, SW2, SW3, and SW4 are shown, any one of which can be used in switching circuits 206A and 206B. Figure 4AThe switch SW1 in the circuit includes a P-type MOS transistor (PMOS) PM1 and a capacitor CST1 connected between the gate G and source S of the PMOS PM1. The gate G and source S are the control and channel terminals of the PMOS PM1, respectively. Capacitor CST1 enables soft switching, slowing down the switching speed of the PMOS PM1 and preventing excessive changes in conduction current. Switch SW1 is typically used when the voltage at the source S is fixed and not less than the voltage at the drain D. When switch SW1 is closed, it disconnects the electrical connection between the source S and drain D.

[0058] Figure 4B The switch SW2 is a back-to-back metal-oxide-semiconductor transistor switch, comprising PMOS PM21 and PM22 connected back-to-back, with their gates electrically connected. When switch SW2 is closed, it ensures that no current flows between its left and right terminals CH1 and CH2, regardless of whether the voltage difference between CH1 and CH2 is positive or negative. Switch SW2 also has a capacitor CST2 to achieve soft-turn-on.

[0059] Figure 4C similar Figure 4A It is implemented using an N-type metal-oxide-semiconductor transistor (NMOS) NM1. Figure 4D similar Figure 4B It is implemented using NMOS NM21 and NM22. Figures 4A-4D The similarities or similarities between them can be understood from the previous explanation and will not be repeated here.

[0060] In one embodiment, Figure 3 In this embodiment, switches QA1 and QA2 are implemented using switch SW1, and switches QB1 and QB2 are implemented using switch SW2. In another embodiment, Figure 3 Switches QA1 and QA2 are implemented using switch SW3, and switches QB1 and QB2 are implemented using switch SW4.

[0061] In the USB PD protocol, when the target voltage of the output power supply changes, the output voltage of the output power supply needs to change monotonically. For example, if the target voltage of the output power supply VO2 is V... O2-TAR If the voltage is changed from 5V to 15V, then the output voltage V O2 The voltage needs to be increased from 5V to 15V without any drop in between. Therefore, the controller 207 in the power supply 200 needs to control the operation of other devices in a timely manner.

[0062] Figure 5A Display target voltage VO1-TAR It is 9V, while the target voltage V O2-TAR Some states experienced by power supply 200 when changing from 5V to 15V. Figure 5A The status also displays a control method implemented according to the present invention, applicable to the power controller 200. The first row, from left to right, shows the status (State), the voltage V of the relay power supply VA, and so on. A The voltage V of the relay power supply VB B The switching states of switches QA1, QB1, QA2 and QB2, and the output voltage V of output power supply VO1. O1 and the output voltage V of the output power supply VO2. O2 . Figure 5A In the diagram, regarding the switch's state, 'O' indicates the on state, meaning the switch is open and provides a short circuit; 'X' indicates the off state, meaning the switch is closed and provides an open circuit.

[0063] State SU0 is the initial state, which is the target voltage V. O1-TAR With V O2-TAR These are the states at 9V and 5V respectively. The relay power supplies VA and VB are adjusted to 9V and 5V respectively, so the voltage V... A With V B The voltages are 9V and 5V respectively. Switches QA1 and QB2 are both on, supplying relay power VA and VB as output power supplies VO1 and VO2 respectively. Therefore, the output voltage V... O1 With V O2 They are 9V and 5V respectively.

[0064] When controller 207 learns the target voltage V O2-TAR When a change from 5V to 15V is required, controller 207 sequentially causes power supply 200 to go through states SU1, SU2, SU3, and SU4. State SU4 is the final state, where the voltage V A With V B The voltages are 15V and 9V respectively. Switches QA2 and QB1 are both on, supplying relay power VA and VB as output power supplies VO2 and VO1 respectively. Therefore, the output voltage V... O1 With V O2 The voltages are 9V and 15V respectively, which meet the target voltage V. O1-TAR With V O2-TAR The requirements are 9V and 15V respectively.

[0065] State SU1 continues from state SU0, adjusting the relay power supply VB to 9V, which means boosting the voltage V. B The goal is to make the voltage V A With V B Roughly the same. Therefore, the voltage V BThe voltage starts rising from 5V and approaches 9V. Due to current losses through the inductor and switch, the voltage V... B The specific voltage V A The actual voltage is slightly less than 9V, and is labeled as 9V-. The output voltage VO2 is equal to the voltage V. B It is also 9V-.

[0066] When the voltage V B After the voltage roughly stops increasing, state SU2 continues from state SU1, turning on switches QA1, QB1, QA2, and QB2. At this time, because the voltage V in state SU1... A Higher than voltage V B Therefore, in state SU2, the higher relay power supply VA simultaneously serves as both output power supply VO1 and VO2. Voltage V B Output voltage V O1 With V O2 All of them are related to voltage V A Similarly, it becomes 9V. During the transition from state SU1 to state SU2, the opening of switch QB1 can be earlier or later than the opening of switch QA2. In one embodiment, the opening of switch QB1 is earlier than the opening of switch QA2, allowing voltage V to... B It is first pulled up by the output power supply VO1, and then by the relay power supply VA, it becomes the output power supply VO2 through the opening of switch QA2.

[0067] State SU3 switches switches QA1, QB1, QA2, and QB2 to the desired switching states for the final state. This is because, in the final state, the output voltage V... O1 With V O2 With voltages of 9V and 15V respectively, switches QA1, QB1, QA2, and QB2 are switched to the same state as in state SU4. That is, switches QA1, QB1, QA2, and QB2 are respectively closed, open, open, and closed. State SU3 closes switches QA1 and QB2, while keeping the others open. State SU3 causes relay power supply VA to no longer serve as output power supply VO1; instead, relay power supply VB serves as output power supply VO1, and relay power supply VA serves as output power supply VO2. At this time, due to current flowing through the inductor and switch losses, the voltage V... B The drop in specific voltage V A The 9V is less, and it is marked as 9V-.

[0068] Once the controller 207 detects voltage V B After a period of time, or after state SU3 has stabilized, state SD4 begins, and controller 207 adjusts the relay power supply VA to 15V. Therefore, voltage V... A From 9V to 15V, the voltage V B The voltage is adjusted to 9V, and the output voltage is V. O1With V O2 They are 9V and 15V respectively.

[0069] Please note, Figure 5A The output voltage V is also shown in the image. O2 It's a monotonous, relentless climb, from 5V all the way up to 15V. Therefore... Figure 5A The control method in the middle can make the output voltage V O2 The changes comply with the provisions of the USB PD protocol.

[0070] Figure 5B Display target voltage V O1-TAR It is 9V, while the target voltage V O2-TAR Some states experienced by power supply 200 when changing from 15V to 5V. Figure 5B The state also shows a control method applicable to the power controller 200 according to the present invention. Figure 5B and 5A Similarities or resemblances can be learned from previous teachings and will not be repeated here.

[0071] State SD0 is the initial state, which is the target voltage V. O1-TAR With V O2-TAR These are the states at 9V and 15V respectively. The relay power supplies VA and VB are adjusted to 15V and 9V respectively, so the voltage V... A With V B The voltages are 15V and 9V respectively. Switches QB1 and QA2 are both on, supplying relay power VB and VA as output power supplies VO1 and VO2 respectively. Therefore, the output voltage V... O1 With V O2 They are 9V and 15V respectively.

[0072] When controller 207 learns the target voltage V O2-TAR When a change from 15V to 5V is required, controller 207 sequentially causes power supply 200 to go through states SD1, SD2, SD3, and SD4. State SD4 is the final state. Voltage V A With V B With 9V and 5V respectively, and switches QA1 and QB2 both on, the relay power supplies VA and VB are supplied as output power supplies VO1 and VO2 respectively. Therefore, the output voltage V O1 With V O2 The voltages are 9V and 5V respectively, which meet the target voltage V. O1-TAR With V O2-TAR The requirements are 9V and 5V respectively.

[0073] State SD1 follows state SD0, adjusting the relay power supply VA to 9V, which is the drop voltage V. A The goal is to make the voltage VA With V B Roughly the same. Therefore, the voltage V A The voltage drops from 15V to 9V. Due to current losses through the inductor and switch, the voltage V... B The specific voltage V A It's slightly less than 9V, marked as 9V-. Output voltage V O1 Equal to voltage V B It is also 9V-.

[0074] When the voltage V A After reaching approximately 9V, state SD2 continues from state SD1, turning on switches QA1, QB1, QA2, and QB2. At this time, because in state SD1, the voltage V... A Higher than voltage V B Therefore, in state SD2, the higher relay power supply VA serves as both the output power supply VO1 and VO2, so the voltage V B Output voltage V O1 With V O2 All of them are related to voltage V A Similarly, it becomes 9V. During the transition from state SD1 to state SD2, the opening of switch QA1 can be earlier or later than the opening of switch QB2. In one embodiment, the opening of switch QB2 is earlier than the opening of switch QA1, allowing voltage V to... B It is first pulled up by the output power supply VO2, and then the relay power supply VA is turned on by the switch QA1 to become the output power supply VO1.

[0075] State SD3 switches QA1, QB1, QA2, and QB2 to the desired switching states for the final state. This is because, in the final state, the output voltage V... O1 With V O2 With voltages of 9V and 5V respectively, switches QA1, QB1, QA2, and QB2 are switched to the same state as in SD4. That is, switches QA1, QB1, QA2, and QB2 are on, off, off, and on respectively. In state SD3, switches QB1 and QA2 are off, while the others remain on. State SD3 causes relay power supply VA to no longer serve as output power supply VO2; instead, relay power supply VB serves as output power supply VO2, and relay power supply VA serves as output power supply VO1. At this time, due to current losses through inductors and switches, the voltage V... B The drop in specific voltage V A It's slightly less than 9V, marked as 9V-. Output voltage V O2 It is also 9V-.

[0076] Once the controller 207 detects voltage V BAfter a period of time, or after state SD3 has been in a fixed state, state SD4 begins, and controller 207 adjusts the relay power supply VB to 5V. Therefore, voltage V B From 9V to 5V, the voltage V A The voltage is adjusted to 9V, and the output voltage is V. O1 With V O2 They are 9V and 5V respectively.

[0077] Please note, Figure 5B The output voltage V is also shown in the image. O2 The voltage dropped monotonously and relentlessly from 15V to 5V. Therefore... Figure 5B The control method in the middle can make the output voltage V O2 The changes comply with the provisions of the USB PD protocol.

[0078] Figure 6 The power supply 300 implemented according to the present invention has two USB output ports, USB-C1 and USB-C2, which can provide output power VO1 and VO2 respectively. The power supply 300 includes an AC to DC power converter 302, a DC to DC power converter 304, switching circuits 306A and 306B, and a controller 307. Figure 6 and Figure 3 Similarities or resemblances can be understood from the previous explanations and will not be repeated here.

[0079] In one embodiment, the DC-to-DC power converter 304 in the power supply 300 is a bidirectional buck-boost converter or a bidirectional buck converter. The controller 307 can control the DC-to-DC power converter 304 to convert the relay power VB1 at one end to the relay power VB2 at the other end, or to convert the relay power VB2 at one end to the relay power VB1 at the other end.

[0080] Switching circuit 306A has switches QA1 and QB1, and switching circuit 306B has switches QA2 and QB2. Taking switching circuit 306A as an example, switching circuit 306A is connected to AC-to-DC power converter 302 and DC-to-DC power converter 304. It can selectively connect either relay power supply VA or relay power supply VB1 to the USB output port USB-C1 as output power supply VO1. When switch QA1 is on, relay power supply VA serves as output power supply VO1; when switch QA1 is off, relay power supply VB1 serves as output power supply VO1. Moreover, when both switches QA1 and QB1 are on, relay power supply VA1 supplies power to relay power supply VB1, and DC-to-DC power converter 304 generates relay power supply VB2 accordingly. Similarly, switching circuit 306B can also selectively use either relay power supply VA or relay power supply VB2 as output power supply VO2.

[0081] The controller 307 can determine from the results of PD protocol communication between the USB output ports USB-C1 and USB-C2 that the output power supplies VO1 and VO2 should be stabilized at the target voltage V. O1-TAR With V O2-TAR Based on this, the AC-to-DC power converter 302 and the DC-to-DC power converter 304 are controlled to change the voltage V. A 、and V B1 or V B2 And switch the switches in switching circuits 306A and 306B as needed.

[0082] In one embodiment, the controller 307 knows that the output power supplies VO1 and VO2 should be stable at 9V and 15V respectively, which is the target voltage V. O1-TAR With V O2-TAR The voltages are 9V and 15V respectively. The controller 307 uses this information to ultimately adjust the voltage V. A V B2 With V B1 The voltages are 15V, 15V, and 9V, respectively, and switches QA1, QB1, QA2, and QB2 are in the states of non-conducting, conducting, conducting, and conducting, respectively. Therefore, the AC-to-DC power converter 302 regulates the output power supply VO2 to 15V, while the DC-to-DC power converter 304 converts the output power supply VO2 and regulates the relay power supply VB1 to 9V as the output power supply VO1.

[0083] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. A power supply with multiple output ports, capable of providing a first output power and a second output power through a first output port and a second output port respectively, the power supply comprising: An AC-to-DC power converter can generate a first relay power supply; A DC-to-DC power converter that can generate a second relay power supply; A first switching circuit, connected to the AC-to-DC power converter and the DC-to-DC power converter, can selectively connect one of the first relay power supply and the second relay power supply to the first output port as the first output power supply; and A second switching circuit is connected to the AC-to-DC power converter and the DC-to-DC power converter, and can selectively connect one of the first relay power supply and the second relay power supply to the second output port as the second output power supply.

2. The power supply as claimed in claim 1, wherein, This DC-to-DC power converter is a step-down converter.

3. The power supply as claimed in claim 1, wherein, The first switching circuit has a first switch and a second switch. The first switch is connected between the first output port and the AC to DC power converter, and the second switch is connected between the first output port and the DC to DC power converter.

4. The power supply as claimed in claim 3, wherein, The second switch includes a back-to-back metal-oxide-semiconductor transistor switch.

5. The power supply as claimed in claim 3, wherein, The first switch has a control terminal and a channel terminal, and the first switching circuit also has a capacitor connected between the control terminal and the channel terminal.

6. The power supply as claimed in claim 1, wherein, The DC-to-DC power converter converts the first relay power to provide the second relay power.

7. A power supply with multiple output ports, capable of providing a first output power and a second output power through a first output port and a second output port respectively, the power supply comprising: An AC-to-DC power converter can generate a first relay power supply; A bidirectional DC-to-DC power converter that can selectively convert a second relay power supply to a third relay power supply, or convert the third relay power supply to the second relay power supply; A first switching circuit, connected to the AC-to-DC power converter and the bidirectional DC-to-DC power converter, can selectively connect one of the first relay power supply and the second relay power supply to the first output port as the first output power supply; and A second switching circuit is connected to the AC-to-DC power converter and the bidirectional DC-to-DC power converter, and can selectively connect one of the first relay power supply and the third relay power supply to the second output port as the second output power supply.

8. A control method applicable to a multi-output port power supply, which can output a first output power supply and a second output power supply, the first output power supply being regulated to an intermediate target voltage, between a first target voltage and a second target voltage, the power supply selectively providing one of a first relay power supply and a second relay power supply as the first output power supply, or selectively providing one of the first relay power supply and the second relay power supply as the second output power supply, the control method comprising the following steps: The first relay power supply and the second relay power supply are provided as the first output power supply and the second output power supply, respectively, and the first relay power supply and the second relay power supply are adjusted to be the intermediate target voltage and the first target voltage, respectively. Adjust the first relay power supply and the second relay power supply to the intermediate target voltage; The higher of the first relay power supply and the second relay power supply is provided as the first output power supply and the second output power supply; The first relay power supply is used as the second output power supply, and the second relay power supply is used as the first output power supply. as well as The first relay power supply is adjusted to the second target voltage, and the second relay power supply is adjusted to the intermediate target voltage.

9. The control method as described in claim 8, further comprising: The first relay power supply is switched to provide the second relay power supply.

10. The control method as described in claim 9, wherein, The second relay voltage of the second relay power source is not higher than the first relay voltage of the first relay power source.

11. The control method as described in claim 8, wherein, The first target voltage is higher than the second target voltage.

12. The control method as described in claim 8, wherein, The first target voltage is lower than the second target voltage.

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